U.S. patent application number 14/729344 was filed with the patent office on 2015-09-17 for electric-powered self-balancing unicycle.
This patent application is currently assigned to RYNO MOTORS, INC.. The applicant listed for this patent is Ryno Motors, Inc.. Invention is credited to Christopher J. HOFFMANN, Anthony J. OZRELIC.
Application Number | 20150259020 14/729344 |
Document ID | / |
Family ID | 50148741 |
Filed Date | 2015-09-17 |
United States Patent
Application |
20150259020 |
Kind Code |
A1 |
HOFFMANN; Christopher J. ;
et al. |
September 17, 2015 |
ELECTRIC-POWERED SELF-BALANCING UNICYCLE
Abstract
An electric powered self-balancing unicycle may include a single
wheel assembly having a drive system substantially contained within
the wheel, a frame and handlebars including a four-bar linkage
mechanism pivotably connected to the wheel assembly by a fork.
Inventors: |
HOFFMANN; Christopher J.;
(Portland, OR) ; OZRELIC; Anthony J.; (Bend,
OR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ryno Motors, Inc. |
Beaverton |
OR |
US |
|
|
Assignee: |
RYNO MOTORS, INC.
Beaverton
OR
|
Family ID: |
50148741 |
Appl. No.: |
14/729344 |
Filed: |
June 3, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13973925 |
Aug 22, 2013 |
9085334 |
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14729344 |
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61863064 |
Aug 7, 2013 |
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61817817 |
Apr 30, 2013 |
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61709924 |
Oct 4, 2012 |
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61692131 |
Aug 22, 2012 |
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Current U.S.
Class: |
180/21 |
Current CPC
Class: |
B60L 2220/42 20130101;
B60L 2240/423 20130101; Y02T 10/7005 20130101; Y02T 10/64 20130101;
B60L 3/0046 20130101; B60L 2220/44 20130101; B60L 2250/10 20130101;
B60L 2250/16 20130101; B62K 1/00 20130101; Y02T 10/7061 20130101;
Y02T 10/72 20130101; B60L 7/12 20130101; B62K 11/007 20161101; B60L
2240/22 20130101; B60L 3/0069 20130101; B60L 58/21 20190201; B60L
2240/36 20130101; Y02T 10/7044 20130101; B60L 3/0092 20130101; B60L
15/20 20130101; B62K 2204/00 20130101; Y02T 10/7275 20130101; B60L
15/2009 20130101; B60L 2270/142 20130101; B60L 2260/34 20130101;
Y02T 10/646 20130101; B60L 50/52 20190201; B60L 2200/16 20130101;
B60L 2240/461 20130101; B60L 58/18 20190201; B62K 19/30 20130101;
B62K 21/12 20130101; Y02T 10/70 20130101; Y02T 10/645 20130101;
B60L 2240/12 20130101; B60L 2270/145 20130101; B60L 2240/421
20130101; B60L 2250/24 20130101 |
International
Class: |
B62K 1/00 20060101
B62K001/00; B62K 21/12 20060101 B62K021/12; B62K 19/30 20060101
B62K019/30 |
Claims
1. A one-wheeled vehicle comprising: a single wheel assembly
including a single wheel having an axis of rotation and a rim
having an inner circumference; an electric drive system coupled to
the wheel assembly and contained within the inner circumference of
the rim; and a frame including a body having an extension member
generally extending perpendicular to the axis of rotation of the
wheel, and a fork operatively connected to the body, the fork
having two legs straddling the wheel assembly; wherein a distal end
of each of the legs of the fork is attached to the wheel assembly
only at a respective connection spaced from the axis of rotation of
the wheel.
2. The vehicle of claim 1, wherein the vehicle is configured to
travel in an operational mode in which the vehicle travels with
only the single wheel assembly contacting a support surface.
3. The vehicle of claim 2, wherein the vehicle is further
configured to convert between the operational mode and a parked
mode in which the frame is rotated about the axis of the wheel such
that the extension member contacts the support surface and resists
lateral toppling of the vehicle.
4. The vehicle of claim 2, wherein the wheel rotates about an axle,
and each of the distal ends of the fork are attached to the wheel
assembly above the axle relative to the support surface when the
vehicle is in the operational mode.
5. The vehicle of claim 1, the electric drive system further
comprising a battery, wherein the battery is accessible through the
side of the wheel assembly without interference from the fork.
6. The vehicle of claim 1, the wheel assembly further including a
first hub cover disposed over a first lateral side of the wheel and
a second hub cover disposed over a second lateral side of the wheel
opposite the first side, the first hub cover being affixed to an
axle of the wheel and the second hub cover being affixed to the
drive system.
7. The vehicle of claim 6, wherein the distal ends of the fork legs
are respectively attached to the first and second hub covers.
8. The vehicle of claim 1, wherein the extension member comprises a
hoop structure.
9. The vehicle of claim 8, wherein the hoop structure comprises two
legs extending generally perpendicular to the axis of rotation and
a crossbar oriented parallel to the axis of rotation rigidly
linking distal ends of the two legs.
10. A one-wheeled vehicle comprising: a single wheel assembly
including a single wheel having an axis of rotation and a rim
having an inner circumference; an electric drive system coupled to
the wheel assembly and contained within the inner circumference of
the rim; a frame including a fork having two legs straddling the
wheel assembly; and an extension member extending from the vehicle
in a direction transverse to the axis of rotation of the wheel;
wherein the extension member includes a hoop structure configured
to support the vehicle in a parked mode in which the frame is
rotated about the axis of the wheel such that the extension member
contacts a support surface and resists lateral toppling of the
vehicle.
11. The vehicle of claim 10, wherein a proximal end of the
extension member is affixed to the frame.
12. The vehicle of claim 10, the frame further comprising a frame
body generally oriented perpendicular to the axis of rotation of
the wheel, a handlebar coupled to a first end of the frame body,
and a support assembly coupling a second end of the frame body to
the wheel assembly.
13. The vehicle of claim 12, wherein the frame body is pivotably
coupled to the support assembly.
14. The vehicle of claim 10, further comprising a controller for
controlling a variable speed and direction of the electric motor,
the controller in electronic communication with an attitude sensing
system; wherein the controller and attitude sensing system are
contained within the inner circumference of the rim; and further
wherein the controller is configured to automatically adjust the
speed and direction of the motor, without a manual throttle
control, to reduce a difference between a pitch measured by the
attitude sensing system and a zero pitch setpoint.
15. The vehicle of claim 10, wherein only the single wheel of the
vehicle and the extension member are in contact with the support
surface when the vehicle is in the parked mode.
16. A one-wheeled vehicle comprising: a single wheel assembly
including a single wheel having an axis of rotation and a rim
having an inner circumference; an electric drive system coupled to
the wheel assembly and contained within the inner circumference of
the rim; a frame generally oriented perpendicular to the axis of
rotation of the wheel, the frame having a free end portion and a
pivoting end portion; a handlebar coupled to the free end portion
of the frame; a support assembly having a first end pivotably
connected to the pivoting end portion of the frame and a second end
affixed to the wheel assembly; and an extension member extending
from the vehicle in a direction transverse to the axis of rotation
of the wheel; wherein the frame is configured to pivot side to side
relative to the wheel assembly, as limited by a mechanical stop;
and wherein the extension member is configured to support the
vehicle in a parked mode in which the frame is rotated about the
axis of the wheel such that the extension member contacts a support
surface and resists lateral toppling of the vehicle.
17. The vehicle of claim 16, wherein the extension member comprises
a hoop structure.
18. The vehicle of claim 17, wherein the hoop structure comprises
two legs extending generally perpendicular to the axis of rotation
and a crossbar oriented parallel to the axis of rotation rigidly
linking distal ends of the two legs.
19. The vehicle of claim 16, wherein a proximal end of the
extension member is affixed to the frame.
20. The vehicle of claim 16, wherein the second end of the support
assembly includes a fork having two legs straddling the wheel
assembly, distal ends of the two legs being attached to the wheel
assembly at respective positions that are offset from the axis of
rotation of the wheel.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 13/973,925, filed Aug. 22, 2013, which claims
priority to U.S. Provisional Patent Application Ser. No.
61/692,131, filed Aug. 22, 2012, U.S. Provisional Patent
Application Ser. No. 61/709,924, filed Oct. 4, 2012, U.S.
Provisional Patent Application Ser. No. 61/817,817, filed Apr. 30,
2013; and U.S. Provisional Patent Application Ser. No. 61/863,064,
filed Aug. 7, 2013, each of which is hereby incorporated herein by
reference in its entirety for all purposes.
INTRODUCTION
[0002] The need for new forms of transportation is ongoing in
modern societies worldwide. One challenge in designing vehicles for
transportation involves balancing energy efficiency, good
usability, and user enjoyment.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] FIG. 1 is a block diagram of an embodiment of a powered
unicycle showing the relationship between certain major
components.
[0004] FIG. 2 is an isometric view of an embodiment of an
electric-powered self-balancing unicycle.
[0005] FIG. 3 is a side elevation view of the powered unicycle of
FIG. 1.
[0006] FIG. 4 is an isometric view of an embodiment of a wheel
suitable for use on a powered unicycle.
[0007] FIG. 5 is a sectional view of the wheel of FIG. 4 taken at
line 5-5.
[0008] FIG. 6 is an isometric view of an embodiment of a seat
portion suitable for use on a powered unicycle.
[0009] FIG. 7 is a side elevation view of a frame portion of the
powered unicycle of FIG. 2.
[0010] FIG. 8 is a top isometric view of the frame portion of FIG.
7, showing an implementation of the mechanism of FIG. 9.
[0011] FIG. 9 is a schematic diagram of an illustrative four-bar
linkage mechanism.
[0012] FIG. 10 is an isometric view of an embodiment of an
electric-powered drive system.
[0013] FIG. 11 is an isometric view of the drive system of FIG. 10,
viewed from an opposite side.
[0014] FIG. 12 is an isometric view of selected drive components of
the drive system of FIG. 10.
[0015] FIG. 13 is a rear plan view of a portion of the powered
unicycle of FIG. 2, showing connections between a fork, drive
housing, hub plates, and foot pegs.
[0016] FIG. 14 is a side elevation view of another embodiment of a
drive system installed in a hubless wheel.
[0017] FIG. 15 is a side view of a portion of the drive system of
FIG. 14, showing the interaction between a drive sprocket and a
ring gear.
[0018] FIG. 16 is an end sectional view of another embodiment of a
hubless drive system.
[0019] FIG. 17 is an isometric view of an embodiment of a powered
unicycle having a gurney affixed thereto.
DETAILED DESCRIPTION
[0020] An electric-powered self-balancing unicycle is described and
illustrated in the present disclosure. Generally, an
electric-powered self-balancing unicycle may include a single wheel
assembly connected to a frame, the frame supporting a seat and
handlebar for a human rider. In some examples, a unicycle may be
self-balancing with respect to an axis parallel to the axis of
rotation of the wheel. The terms "bike," "cycle," "unicycle," and
"vehicle" may all be used interchangeably herein to indicate a
one-wheeled vehicle constructed according to the present
disclosure. Electric-powered unicycle devices and systems are
described in U.S. Patent Publication No. 2012/0217072, which is
hereby incorporated by reference in its entirety for all
purposes.
[0021] Unless otherwise specified, a powered unicycle according to
the present disclosure, and/or its various components, may but are
not required to contain at least one of the structure, components,
functionality, and/or variations described, illustrated, and/or
incorporated herein. Furthermore, the structures, components,
functionalities, and/or variations described, illustrated, and/or
incorporated herein in connection with the unicycle may, but are
not required to, be included in other similar apparatuses.
[0022] FIG. 1 shows a schematic diagram of certain main components
of a powered unicycle 10 constructed according to the present
disclosure. Unicycle 10 may include any suitable single-wheeled
vehicle configured with a drive system contained in the wheel and a
multi-input, auto-balancing control system controlling the drive
system. In the example depicted, unicycle 10 may include a wheel
assembly 12 driven by one or more motors 14, which in turn are
controlled by a controller 16 receiving one or more inputs 18.
[0023] Wheel assembly 12 may include any suitable single-wheeled
structure configured to contain a drive system substantially within
a wheel. Examples of such wheel assemblies are described in further
detail below. Motor or motors 14 may include any suitable motor
and/or other primary mover configured to rotate the wheel of wheel
assembly 12. For example, motor 14 may include a battery-powered
electric motor operatively connected to wheel assembly 12 such that
rotation of the motor causes rotation of the wheel. Gearing and
timing systems and the like may be included in a drive system to
facilitate driving of the wheel by motor 14. These systems are also
described in further detail below.
[0024] Controller 16 may include any suitable electronic controller
configured to automatically adjust the speed and/or direction of
the wheel based on the states of certain inputs 18. In the example
shown in FIG. 1, these inputs 18 may include an attitude input 20,
a tilt adjust input 22, and/or a braking input 24. In some
examples, controller 16 may include one or more suitable
interconnected electronic circuits, memory storage units, motor
controllers, and/or control chips configured to carry out software
and/or firmware instructions to control motor 14.
[0025] Attitude input 20 may include any suitable input configured
to correspond to a physical orientation of vehicle 10. Input 20 may
be provided by an attitude sensing system 26. Attitude sensing
system 26 may include any suitable sensors and/or apparatuses
configured to determine an orientation of vehicle 10 in space
relative to the center of the earth. For example, attitude sensing
system 26 may include one or more sensors 28 for determining pitch,
roll, and/or yaw. In these examples, the terms pitch, roll, and yaw
are used with their standard meanings. Accordingly, pitch may be
defined as pivoting about an axis parallel to an axis of rotation
of the wheel, interchangeably termed the "Y" axis. Pitch may also
be described as tilting a nose of the vehicle up and down. Roll may
be defined as pivoting about an axis parallel to the direction of
travel of the vehicle, interchangeably termed the "X" axis. Roll
may also be described as tilting the vehicle side to side. Yaw may
be defined as pivoting about an axis parallel to a vertical axis
through a center of the wheel, interchangeably termed the "Z" axis.
Yaw may also be described as rotating the wheel left and right,
such as when changing a heading or direction of travel.
[0026] In some examples, sensors 28 may include one or more
inclinometers, accelerometers, and/or gyroscopes. For example, a
roll-type sensor 28 may include an accelerometer in combination
with a gyroscope to form an inclinometer configured to sense a roll
orientation. Sensors 28 may be affixed to vehicle 10. In some
examples, sensors 28 may be collocated with controller 16, such as
on a common circuit board or within a common enclosure. In some
examples, sensors 28 may be located near a center of gravity of the
vehicle, such as within wheel assembly 12. This location may
improve accuracy of the sensors with respect to the actual
orientation of the vehicle, as opposed to a location farther from
the center of gravity.
[0027] Controller 16 may be configured to respond to attitude input
20 by automatically adjusting motor 14 to reduce the difference
between the measured orientation and a desired orientation. For
example, a measured or sensed pitch may be compared to a desired
pitch orientation. If the actual pitch is different from the
desired pitch, the controller may increase or decrease the speed of
motor 14 to reduce the difference. The desired pitch may be
referred to as the "zero pitch setpoint" or "zero setpoint."
[0028] In some examples, the zero pitch setpoint may be
substantially equivalent to a pitch of zero degrees from vertical,
which may correspond to a vertical and/or balanced unicycle. In
these examples, if the bike tips forward, sensors 28 will detect a
pitch indicating that the nose of the bike is tipped downward from
horizontal, and pass that pitch to the controller. The controller
will compare the sensed pitch to the zero setpoint, and will
determine that a difference exists in the forward direction. In
some examples, this difference may be positive, while a difference
in the tipped-backward direction may be negative.
[0029] The controller will then take action to reduce the positive
differential or delta between the sensed and desired pitch. In this
example, the controller may increase the speed of motor 14 to drive
the wheel forward and reduce the forward pitch of the bike. As this
action takes effect and the sensed difference approaches zero, the
controller may cause acceleration of the motor to level off, and a
new equilibrium may be reached at a new higher speed. Similarly,
determining that a negative delta exists may cause a reduction in
motor speed or may cause a change in motor direction. Accordingly,
a user (interchangeably termed a "rider" or an "operator") may
control the speed of unicycle 10 by leaning forward or backward to
shift a weight distribution and thereby tilt the vehicle, causing
the sensed pitch to vary from the zero setpoint and the controller
to compensate as discussed above.
[0030] In addition to a pitch-type sensor providing an input to
allow the controller to compensate for variations from a desired
pitch, other sensor inputs may be received by the controller to
carry out various other functions. For example, a roll sensor input
may be compared to an expected range of roll orientations to
determine whether the vehicle has fallen over. In this example, the
controller may be configured to shut off power to the vehicle, or
to selected subsystems such as the drive system, when such a
condition is sensed.
[0031] In some examples, the pitch sensor may provide skewed
information when certain conditions exist, such as when turning the
vehicle creates a significant centrifugal force. In this condition,
the skewed pitch sensor may send erroneous information to the
controller, leading the controller to incorrectly conclude that a
pitch correction is needed. The inventors have determined that the
controller may compensate for this previously unexpected skewing
condition using an input from the roll sensor. When unicycle 10
turns, the wheel necessarily tilts on the X axis, resulting in a
roll value that indicates a turn may be in progress. This
information may be used to compensate for the resulting skewed
pitch input, for example by offsetting the sensed pitch value by a
predetermined or calculated amount.
[0032] Controller 16 may receive tilt adjust input 22 from a first
user input device such as a tilt adjust control 30. Tilt adjust
control 30 may include any suitable mechanical or virtual user
interface device configured to allow a user to communicate a
desired tilt adjust amount to controller 16. For example, tilt
adjust control 30 may include a dial, switch, pushbutton(s), lever,
and/or keypad. Any of these user input devices may be implemented
mechanically or virtually, such as in the case of a graphical user
interface (GUI) on a screen or other display mounted on or
otherwise associated with unicycle 10. In some examples, a user
input device may include a voice user interface capable of speech
recognition, through which a user may provide voice commands to the
controller.
[0033] Regardless of the type of user input device, input 30 may be
used to offset the zero pitch setpoint by an amount corresponding
to the input. For example, a user may push a first button to
communicate to the controller that the zero setpoint should be
offset by one degree in a positive direction. In this example, the
user may press a second button to communicate an offset of one
degree in a negative direction. In other examples, a user may
communicate the desired offset by turning a continuous or discrete
dial, entering a number on a keypad, etc. In response, controller
16 may offset the zero setpoint by the desired amount, or by a
corresponding amount.
[0034] For example, if a "three degrees forward" offset is
indicated by the user, the zero setpoint may be adjusted to three
degrees forward of vertical, and the controller would then use that
new zero setpoint for comparing to actual pitch when controlling
motors 14. In this example, the controller would attempt to
maintain the unicycle at a three degree angle rather than the
original zero degrees from vertical. Using the tilt adjust control
in this manner, a user may adjust the desired tilt angle of the
bike, in real time. This may be desired, for example, to compensate
for a rider's body type, weight distribution on the bike, user
comfort, and/or support surface inclines and declines.
[0035] The offset amount may be implemented in software or firmware
by using a static variable, such that the desired offset amount
remains at the value communicated by the user until the user
provides a different input, such as via tilt adjust control 30.
Furthermore, the value of this offset amount may be stored in
nonvolatile memory such that the zero setpoint is offset by the
same amount even if power to the controller is cycled. In some
examples, a similar result may be achieved by using a hardware
implementation, such as by providing a tilt adjust control 30 in
the form of a dial that remains in a set position until the user
sets a different position. In some examples, stored user profiles
may be provided, and each user profile may have its own custom
offset value. In these examples, a user may select one of the
established profiles and the zero setpoint may be adjusted
accordingly.
[0036] Controller 16 may receive braking input 24 from a second
user input device such as a braking control 32. Braking control 32
may include any suitable mechanical or virtual user interface
device configured to allow a user to communicate a desired braking
amount to controller 16. For example, braking control 32 may
include a hand-operated lever typical in bike and motorcycle
braking systems, but may also or instead include one or more
controls such as a dial, switch, pushbutton, and/or keypad. As with
control 30, any of these user input devices (and any other user
input devices or controls associated with unicycle 100) may be
implemented mechanically or virtually, such as via a graphical user
interface (GUI) on a screen or other display. Also as with control
30, control 32 may include a voice user interface capable of speech
recognition, through which a user may provide voice commands to the
controller.
[0037] Regardless of the form of control 32, braking input 24 may
be communicated to controller 16, which may in turn use the input
in a software- or firmware-controlled braking system. The braking
system may be a regenerative braking system in which motors 14 are
turned into electrical generators, dumping energy into the
associated battery or batteries. The inventors have found that a
regenerative braking system is generally sufficient for braking of
a unicycle 10. Friction brakes may be included for additional
braking capabilities, in some embodiments.
[0038] Controller 16 may control motors 14 in the
software-controlled braking system in a fashion similar to the tilt
adjust control system discussed above. In some examples, in
response to braking input 24, the zero setpoint may be offset to
artificially indicate to the controller that the unicycle is
tipping over backward by some amount. To compensate, the controller
will slow the motors, causing them to enter a regenerative-braking
state if necessary to further slow the vehicle. This system may be
in addition to the option a rider has to lean back to slow the
vehicle.
[0039] FIGS. 2 and 3 depict an illustrative powered unicycle
generally indicated at 100. Unicycle 100 may be an example of
unicycle 10, and may include a wheel assembly 102 containing a
drive system, a fork assembly 104 attached to the wheel assembly,
and a frame portion 106.
[0040] Wheel assembly 102 may include a wheel 108 configured to
rotate on an axis of rotation 110 and having a rim 112 on which may
be mounted a tire 114. Wheel 108 may include any suitable wheel,
and may be a typical motorcycle racing wheel. In some examples,
wheel 108 may be hubless. In other examples, wheel 108 may have a
hub and may be configured as shown in FIGS. 4 and 5, with rim 112
having an internal circumference or perimeter P and a width W
defined between two opposing flanges 116 and 118. As shown in FIGS.
4 and 5, a mounting surface 120 of wheel 108 may be offset to one
side to form an internal space 122 in wheel 108 defined by the rim
and the mounting surface. Mounting surface 120 may be any suitable
rigid surface for attaching wheel 108 to a drive system. For
example, mounting surface 120 may include a metal plate having
multiple through-holes arranged in a pattern to accommodate
mounting bolts and lug nuts. Mounting surface 120 may be connected
to rim 112 by a substantially solid plate 124 or by other suitable
structures such as spokes. In some examples, plate 124 may include
apertures 126 or slots for weight reduction, which may be arranged
symmetrically around mounting surface 120 as shown in FIGS. 4 and
5.
[0041] Tire 114 may be attached to rim 112, such as at flanges 116
and 118, and may include any suitable tire configured to provide an
interface between the rim and a support surface. In some examples,
tire 114 may include a standard 200 mm motorcycle racing tire,
which may be mounted to a 17-inch diameter.times.6-inch wide
automotive example of a rim 112. In some examples, tire 114 may
include a rounded or peaked profile to facilitate leaning and
maneuverability while balancing the vehicle.
[0042] Returning to FIGS. 2 and 3, frame portion 106 may be mounted
above wheel assembly 102. Frame portion 106 may include any
suitable structure configured to provide a skeletal support for
operatively connecting various components to the wheel assembly.
For example, frame portion 106 may include a tubular framework
configured to support a rider interface including a handlebar 128
and a seat assembly 130. Frame portion 106 may be constructed of
any suitable materials, and may include aluminum tubing such as the
tubing used in bicycle frame construction. This tubing may be
formed into aesthetically pleasing appearance, which may be further
enhanced by decorative body panels 132 attached to the frame. Body
panels 132 may include any suitable lightweight plates or panels
configured to attach to frame portion 106. Body panels 132 may, for
example, provide decoration and/or color, cover gaps or frame
tubes, and/or display information such as a company logo. In some
examples, body panels 132 may include cowlings or fairings. In some
examples, body panels 132 may include vacuum-formed rigid plastic
plates. Frame portion 106 may include various attachment points,
tabs, apertures, bosses, and the like for attaching these and other
accessories such as saddle bags.
[0043] Handlebar 128 may include any suitable structure configured
to provide support for the weight of a rider as well as a steering
interface between the rider and the bike. In some examples,
handlebar 128 may also provide a mounting surface for attaching
accessories and/or controls. In the example depicted in FIGS. 2 and
3, a generally straight handlebar 128 having hand grips at opposite
ends is attached at a forward end portion of frame portion 106.
While a generally straight handlebar is depicted in this example,
other standard and non-standard handlebar configurations may be
suitable.
[0044] A brake lever 134, which is an example of brake control 32,
and a two-button attitude adjust control 136, which is an example
of control 30, may be mounted to handlebar 128 in locations easily
accessible by the hands of the rider. A display module 138 may also
be mounted to the handlebar, and may display information such as
battery charge, power usage, tilt angle, and/or other information
useful to a rider or operator. These controls and interfaces may be
in electronic communication with the controller via cables (not
shown) and/or by a Bluetooth and/or other wireless connection.
[0045] In some examples, frame portion 106 may include an extension
member or crash bar 140 extending generally in the direction of
travel of the vehicle. Crash bar 140 may include any suitable
structure configured to contact a support surface 142 (such as the
ground or a road) when unicycle 100 is pivoted forward about the Y
axis, and to support the weight of the unicycle. In some examples,
a structure such as a kickstand may be used to prevent the vehicle
from tipping over in this pivoted mode. In some examples, crash bar
140 may itself be further configured to bias the vehicle against
tipping over sideways when the vehicle is resting on the crash bar.
In the example depicted in FIGS. 2 and 3, crash bar 140 is
configured as a hoop structure having two members extending forward
and a crossbar connecting the distal ends of the members. Resilient
bumpers 144 may be affixed to contact points on crash bar 140.
[0046] Because crash bar 140 may support the weight of the vehicle
and may further prevent tipping, unicycle 100 may be placeable into
two modes. A first, or operational mode may include riding the
vehicle in a generally vertical orientation with the single wheel
contacting support surface 142. A second, or parked mode may
include placing the vehicle in a tilted-forward position with the
crash bar contacting support surface 142. The second mode may
require the controller and/or motors to be at least partially
disabled or inactivated such that the forward tipped posture of the
vehicle is not automatically sensed and compensated for.
[0047] Seat assembly 130 may be operatively connected to and
supported by frame portion 106. With continuing reference to FIGS.
2 and 3, as well as with more specific reference to FIG. 6, seat
assembly 130 may include a seat portion 146 adjustably mounted to a
support frame 148 by an adjustment assembly 150 including a spring
in the form of a shock absorber 152. Seat portion 146 may include
any suitable structure configured to support a human rider in a
seated position, and may further be configured to allow a rider to
straddle the seat in a crouched or standing position. For example,
seat portion 146 may include a standard motorcycle or bicycle
seat.
[0048] The seat may be adjustable in one or more directions, as
shown in FIG. 6. In the example shown, the seat is supported by
adjustment assembly 150 at a front end on a slotted hinge
connection and at a rear end on a slotted bracket connected to
shock absorber 152. The upper end of shock absorber 152 may be
selectably positioned in the slot and clamped in place, such as by
a quick-disconnect lever-operated clamp similar to those typically
used to attach bicycle wheels to bicycle fork dropouts. Because the
rear slotted bracket is angled, and the lower end of shock absorber
152 is pivotable at a fixed location on the frame, changing the
position of the shock in the slot will change both the height and
the angle of seat portion 146. In some examples, seat portion 146
may be adjustable from approximately 30 inches to approximately 38
inches above the ground. In other examples, seat assembly 130 may
be mounted to frame portion 106 in a fixed position. In some
examples, seat assembly 130 may include a circumferential frame
and/or a fixed rear handle, such as a hoop handle 153 shown in the
drawings.
[0049] Turning now to FIGS. 7 and 8, and with continued reference
to FIGS. 2 and 3, frame portion 106 may include a pivotable
connection 154 to fork assembly 104. Pivotable connection 154 may
include any suitable structure configured to allow frame portion
106 to pivot generally side to side relative to fork assembly 104.
For example, pivotable connection 154 may include a head tube 156
oriented at a head tube angle 158, further described below.
Pivoting of the frame may be limited by a mechanical stop 160.
Mechanical stop 160 may include any suitable structure configured
to limit pivoting of the frame to a predetermined range. In the
example shown in the drawings, mechanical stop 160 includes a
member 162 having one end affixed to a rotating portion of head
tube 156 and an opposite end protruding through an aperture in a
fork crown bracket 164 fixed to fork assembly 104.
[0050] Pivoting of frame portion 106 relative to fork assembly 104
may be additionally or alternatively limited by a four-bar linkage
mechanism. A schematic four-bar linkage mechanism 166 is depicted
in FIG. 9. Mechanism 166 may include four links 168, 170, 172, and
174, attached to each other at four pivoting connections, A, B, C,
and D. In this example, opposing pairs of links are substantially
equivalent in length and parallel to each other. As shown in
FIG.
[0051] 9, if link 168 is held fixed, the other three links may be
pivoted from side to side, and opposing links remain substantially
parallel to each other at all times. Accordingly, mechanism 166 may
be referred to as a parallelogram four-bar linkage mechanism.
Importantly in this example, link 172 opposite to link 168 remains
in the same orientation throughout pivoting of the linkage.
[0052] Returning to FIG. 8, the conceptual four-bar linkage
mechanism 166 may be implemented in the depicted example of frame
portion 106. In this example, frame portion 106 includes a drag
link 176 attached at a front end to a bell crank bracket 178 and at
a rear end to fork crown bracket 164. Drag link 176 is parallel to
and offset to one side from the centerline of frame portion 106.
Accordingly, in this embodiment, fork crown bracket 164 corresponds
to link 168, drag link 176 corresponds to link 170, bell crank
bracket 178 corresponds to link 172, and frame portion 106
corresponds to link 174.
[0053] Bell crank bracket 178 may include any suitable linking
structure configured with two rotatable connections offset from
each other. In the example shown, bell crank bracket 178 is a
teardrop-shaped plate with the drag link attached to the smaller
end of the teardrop and the handlebars attached at the larger end
of the teardrop. Bell crank bracket 178 may be interchangeably
termed the "front bell crank" and fork crown bracket 164 may be
interchangeably termed the "rear bell crank" due to their similar
functions in this context. The handlebar attachment is formed as a
pivoting connection by including a rotatable head tube 180
configured such that handlebar 128 is independently pivotable
relative to frame portion 106, but is pivotably coupled to bell
crank bracket 178 such that they turn together.
[0054] As in mechanism 166, this forms a parallelogram four-bar
linkage mechanism with a fixed link at bracket 164 and four
rotatable connections. To facilitate return of the mechanism to a
neutral, center position, a return spring or other biasing
mechanism may be included. For example, a return spring 181 may
function to return the frame portion to a center position. In some
examples, return spring 181 may include two springs mounted inline
or coaxially with respect to the drag link on either side of a
spool-type bracket.
[0055] Swinging the free end of frame portion 106 side to side
about head tube 156 at the pivoting end of frame portion 106 causes
handlebar 128 to swing with the frame. However, the four-bar
linkage causes handlebar 128 to remain generally parallel to the Y
axis at all times. Among other things, this facilitates an
intuitive steering experience for the rider.
[0056] As best seen in FIGS. 2 and 3, fork assembly 104 connects
frame portion 106 to wheel assembly 102, and may include two main
legs 182 configured to straddle the wheel assembly, with proximal
ends 184 of the two legs meeting at or connected to fork crown
bracket 164. Unlike with typical forks, distal ends 186 here may be
attached to points on the wheel assembly spaced from axis of
rotation 110. For example, wheel assembly 102 may include left and
right hub cover plates 188 and 190, and distal ends 186 of legs 182
may each be attached to a respective hub cover plate at a point
above the axis of rotation, as shown in the drawings.
[0057] Fork assembly 104 may further include additional bracing
and/or framework such as rear trellis 185. Rear trellis 185 may
include any suitable structure configured to reinforce the
connection between legs 182 and fork crown bracket 164, and may
further facilitate connection of fork assembly 104 to other
components of unicycle 100. For example, rear trellis 185 may
include tubular frame components, connection points, buttress
plates, and/or braces. In some examples, rear trellis 185 may
provide a support and connection framework for attaching a fender
187 as shown in FIGS. 2 and 3.
[0058] Hub cover plates 188 and 190 may each include any suitable
rigid structure configured to substantially cover the lateral
portions of wheel 108 within the diameter of the rim, and to
provide supportive connection points for both fork 104 and a drive
system disposed within space 122. One or both of the hub cover
plates may include a bracket, brace, and/or other reinforced
portions configured to facilitate a rigid support structure. Hub
cover plates 188 and 190 may each include apertures or access
ports, such as for accessing one or more batteries within space 122
without removing the hub cover plate. The unconventional attachment
of fork assembly 104 may facilitate such accessibility through the
side of the wheel, because the fork legs do not physically
interfere with access. The interaction of fork assembly 104 with
other components of unicycle 100 is further discussed below
regarding FIG. 13.
[0059] Steering of unicycle 100 may be affected by various aspects
of the structures and mechanisms described above to create a more
intuitive driving experience for the rider. In general, steering
may be accomplished by leaning and redistributing weight on the
vehicle in order to cause the wheel to go where the rider desires.
The pivotable frame portion and four-bar linkage mechanism may
facilitate steering by allowing the rider to further redistribute
his or her weight by throwing the front end of the frame, and the
seat on which the rider is seated, over to one side of the vehicle.
Maintaining handlebar 128 square with respect to the wheel during
this activity may further aid in steerability. Additionally, when
the frame reaches the mechanical stop, added torque is placed on
the fork assembly and therefore on the wheel assembly.
[0060] Further assisting in an intuitive steering experience is the
geometry of the frame-to-fork connection. As described above, the
pivot point connection at head tube 156 may be angled and located
behind the midpoint of the vehicle. Head tube angle 158 may be in
the range of about 15 degrees to about 35 degrees, and the
inventors have found an angle of about 20 degrees to be suitable.
Head tube 156 may be offset such that an imaginary line 192 drawn
through the central long axis of the head tube intersects with
support surface 142 behind the point where wheel 108 contacts
support surface 142. A distance between the intersect point and the
wheel contact point may be about four to about ten inches, and in
some examples may be about five inches, although other offsets may
be suitable.
[0061] Turning now to FIGS. 10 and 11, an illustrative drive system
200 suitable for use with unicycle 100 is depicted in two different
isometric views. Also, in FIG. 12, system 200 is depicted with only
certain drive components shown in an isometric view to illustrate
the relationships between those components. Drive system 200 may
include any suitable devices and components configured to fit
substantially within internal space 122 of wheel 108 or a similar
wheel and to provide sustained rotational force to rotate the wheel
in either direction, thereby causing the vehicle to travel across
support surface 142. In this example, drive system 200 includes a
housing 202, two electric motors 204 and 206, a main drive pulley
208, a countershaft 210, a countershaft pulley 212, a main lug
pulley 214, and an axle 216.
[0062] Housing 202 may include any suitable structure configured to
house a controller and a battery or batteries, and to provide
structural support and connection points for mounting the various
drive components. In this example, housing 202 is a rigid metal
housing having an upper compartment 218 for containing an
electronic controller (not visible) substantially similar to
controller 16, a battery compartment 220 for housing one or more
batteries 222, and a lower drive mounting portion 224 for mounting
the various moving parts of the drive system. Axle 216 passes
through the central portion of the housing, and in this example is
a non-rotating shaft on which other components may be supported
and/or mounted.
[0063] Electric motors 204 and 206 may be mounted to housing 202 on
opposite sides, and transverse to the direction of travel of the
unicycle. The motors may include any electric motors suitable for
driving wheel 108 with sufficient power to facilitate
transportation of an adult human across support surface 142 at a
reasonable speed. In some examples, a single motor may be used. In
some examples, non-electric motors may be included, such as two- or
four-stroke internal combustion engines. In the example depicted in
the drawings, each motor is a 1,000 Watt electric motor.
[0064] Motors 204 and 206 may be powered by storage battery or
batteries 222. Batteries 222 may include any portable power storage
device capable of providing adequate power to motors 204 and 206
for a desired usage period. In some examples, batteries 222 may
include Lithium-Ion batteries and/or lead acid batteries. Batteries
222 may be rated at 30 amp-hours of battery life with 150 amps of
peak current flow to the motors. As discussed above, batteries 222
may be housed in battery compartment 220 of the housing, and may be
accessible through an access port or window on a side of wheel
assembly 102 without disassembling the vehicle.
[0065] Motors 204 and 206 may be operatively connected to a common
drive pulley in the form of main drive pulley 208 by respective
timing belts 226 and 228 as shown in FIGS. 11 and 12. The resulting
torque created by main drive pulley 208 is transmitted to
countershaft pulley 212 on the opposite side of housing 202 by
countershaft 210. The term "jackshaft" may be used interchangeably
with the term "countershaft." A main drive belt 230 then transfers
the torque from the jackshaft pulley to main lug pulley 214, which
rotates around stationary axle 216. In some examples, chains or
other transmission devices may be used in place of one or more of
the belts just described. In some examples, one or more additional
typical supporting components may be included, such as idler
pulleys, belt tensioners, torque rods, etc., all carrying out their
standard and known functions.
[0066] Main lug pulley 214 may include a plurality of lugs 232 for
mounting wheel 108, such as by attaching mounting surface 120 of
the wheel to the threaded lugs using lug nuts (not shown). This
mounting method may be substantially similar to the standard method
of attaching an automotive wheel to a car when changing a flat
tire. Accordingly, the wheel may be affixed to the main lug pulley,
and the torque of main lug pulley 214 may be transferred to wheel
108. Motors 204 and 206 thereby indirectly cause the wheel to
rotate. The controller and associated systems can therefore control
the speed and direction of wheel 108 by controlling the speed and
direction of the motors. One or more speed sensors may be included
in drive system 200 for providing the controller with feedback
regarding actual speed of the motors and/or wheel.
[0067] Turning now to FIG. 13, a rear plan view of a portion of
unicycle 100 is depicted, showing the connections between fork
assembly 104, hub cover plates 188 and 190, housing 202, and axle
216. In general, these structures are affixed to each other as
shown and as explained below, and wheel 108 is mounted only to the
lug pulley as described above, allowing the wheel to spin freely
around the housing and within the fork and hub cover plates, none
of which is attached directly to the wheel. As depicted in FIG. 13,
legs 182 of fork assembly 104 straddle the hub cover plates,
mounting directly to the plates above the axle. Housing 202 is
bolted directly to left hub cover plate 188, and may further be
attached to axle 216. Right cover plate 190 is attached to axle
216. Accordingly, the combination of the fork, hub plate, housing,
and axle may form a rigid unitary structure capable of supporting
the wheel and transferring torque and other moments from the rider
and steering system to the wheel.
[0068] Foot pegs 234 and 236 may be attached to respective hub
plates, or directly to opposite ends of axle 216. Foot pegs 234 and
236 may include any suitable structure configured to support a
rider's foot, in a resting and/or standing posture, and to transfer
torque from the feet of the rider to the wheel assembly. In some
examples foot pegs 234 and 236 may be hinged to allow them to be
folded out of the way as desired. In some examples, crash bars 238
may be provided near foot pegs 234 and 236, respectively, as shown
in FIGS. 2 and 3. These crash bars may extend laterally beyond the
hinged connection of foot pegs 234 and 236, and may provide
protection from the foot pegs, such as to a rider's leg when
passing by or to an underlying surface when storing or otherwise
laying the vehicle on its side.
[0069] In addition to the other aspects of vehicle steering
described above, foot pegs 234 and 236 may also enhance or
facilitate steering of unicycle 100. The foot pegs may be used by a
rider as a steering control input. Because the steering pivot at
head tube 156 is behind the axis of rotation of the wheel, the
rider may be able impart a twist directly on the wheel as if
standing on a plank balanced on a fulcrum. This twist may cause the
wheel to lean over and follow a turning arc. This rider/foot peg
interaction, in conjunction with leaning of the rider's body and
moving of the handlebars side to side, may allow the rider many
degrees of freedom in steering. This, in turn, may facilitate tasks
such as traversing uneven terrain.
[0070] Other examples of a drive system suitable for use in a
unicycle constructed according to the present disclosure is
depicted in FIGS. 14-16 and generally indicated at 300. Drive
system 300 is a hubless drive system, also referred to as a rim
drive system. In this example, the wheel of the unicycle is a
hubless wheel 302, which may include a rim 304 and an attached tire
306, but which does not include structures such as mounting surface
120 or spokes 124. Drive system 300 may include a housing 308
disposed within internal space 310 of rim 304, one or more
battery-powered motors 312 operatively connected to one or more
respective drive pulleys 314 by belts 316, one or more drive
sprockets 318 associated with each drive pulley 314, and a ring
gear 320 disposed on an inner surface of rim 304. Idler rollers 322
may be attached to housing 308 at various points around the
circumference of the rim to maintain the housing positioned
properly within the rim. In other examples, the idler rollers may
themselves be driven by one or more motors, providing a frictional
drive by interacting directly with rim 304. In some examples, drive
system 300 and/or housing 308 may not take up the entirety of space
310, leaving an opening or void or through-space in the wheel and
revealing the hubless nature of the assembly. An example of this
type of void space is shown above the housing in FIG. 14.
[0071] Drive system 300 may operate to rotate wheel 302 by
controlling motors 312 to rotate drive sprockets 318 via coaxial
pulleys 314. Rotation of the rim and wheel may then result from
interaction between the rotating drive sprockets and the
complementary ring gear, which is fixed with respect to the rim. In
some examples, the drive sprockets and the ring gear have
complementary teeth. In some examples, the drive sprockets are
toothed, and the ring gear is a drive chain affixed to the rim and
having spaces corresponding to the teeth of the sprockets.
[0072] A fork assembly may attach to housing 308 either directly or
via hub plates, similar to the connections described above
regarding unicycle 100. Because the wheel is hubless and the drive
and housing may fit into a lower portion of the wheel, an open
space may be included to reveal the hubless nature of the wheel. In
some examples, this space may be used to house one or more
batteries. In some examples, the battery or batteries may be housed
in a space between opposing drive motors, such as in space 324
shown in FIG. 14.
[0073] FIG. 17 is an isometric view of an illustrative embodiment
in which a mounted accessory 340 is operatively connected to the
wheel assembly rather than a seat for a mounted rider as described
in the examples above. Mounted accessory 340 may be any suitable
structure configured to carry, transport, or otherwise move a load
across a support surface on a unicycle according to the present
disclosure. In the example depicted in FIG. 17, mounted accessory
340 includes a gurney 342. In this example, gurney 342 may be
operatively connected to a wheel assembly 344 substantially similar
to wheel assembly 102, driven by a drive system similar to drive
systems 200 or 300. Because wheel assembly 102 is steerable by
leaning, and balancing is automatically controlled with respect to
pitch, a vehicle such as the combination of gurney 342 and wheel
assembly 344 may facilitate moving a patient by an operator holding
one end of the gurney. Transport of the vehicle may be accomplished
similar to operating a wheelbarrow, but may be significantly easier
than carrying the gurney or manually pushing or pulling the gurney,
especially over rugged terrain or over long distances.
[0074] The vehicle in this example may be capable of carrying a
patient weighing up to 350 lbs. The vehicle may be capable of
moving at a speed of up to six miles per hour, and may be capable
of moving with a passenger on the gurney up an incline of up to
about a 30% grade. In some examples, the vehicle with gurney 342
may include a removable battery that can be removed without tools
and the battery may have a recharge time of six hours.
[0075] In some examples, a steering area may be situated at one end
of gurney 342 , and may include a throttle control, an on/off
button, a tilt adjust control, a brake control, and other features
desired such as a screen to display desired information (e.g., hill
grade, speed, battery life, current weight, etc.). The vehicle may
be adapted such that the driver walking behind the vehicle at the
steering area can maintain a center of gravity of the gurney above
the wheel. The steering configuration may allow the driver to
rotate the substantially horizontally situated gurney in clockwise
or counterclockwise directions in order to effectuate steering
while moving. When the vehicle is not in use, one end of the gurney
may rest against the ground in a parked configuration. In some
examples, gurney 342 may be equipped with a quick release mechanism
(not shown), allowing quick removal of the gurney from the wheel
assembly.
Examples and Additional Details
[0076] Any user interface or control associated with a vehicle such
as unicycle 10 or unicycle 100 may include any suitable physical or
virtual user interface configured to allow an operator to
communicate information to the controller, or to carry out one or
more functions of the controller itself. For example, a user
interface may include one or more manipulable controls such as a
lever, dial, switch, slider, pushbutton, keypad, and/or knob, any
of which may be implemented mechanically or virtually, such as via
a graphical user interface (GUI) on a screen or other display. Any
manipulable control may be manipulated by a body part of the
operator, such as by a hand, a foot, and/or one or more fingers or
toes. In some examples, a user interface may include a voice
interface capable of speech recognition, through which the operator
may provide voice commands to the controller. In some examples, a
user interface may include a wearable computing device, such as an
article of clothing or a wrist- or head-mounted interface. In some
examples, a user interface may include any suitable device
implanted on or in the operator's body.
[0077] Unicycles such as unicycle 10 and unicycle 100 may be
electric-powered and therefore lack traditional noises associated
with gas-powered engines. In some embodiments, unicycle 10 may
include sound features such that unicycle 10 may project a
gas-powered engine noise. Other sound features may include a
start-up sound, a revving sound, a power-down sound, and/or any
other sound desired. The sound features may be electronically
controlled, such as by modulating control signals to one or more
motors. In some examples, this may include pulse width modulation.
The sound features may be electronically triggered to output based
on an associated action of unicycle 10 (e.g., turning a key to
start up unicycle 10 may cause a start up sound; movement of
unicycle 10 may cause a revving or movement sound, etc.). Output of
the sound feature may be generated by the motor itself, or may
occur through one or more speakers coupled to unicycle 10, the one
or more speakers being in communication with the controller of
unicycle 10.
[0078] Various accessories and auxiliary components may be included
in a unicycle according to the present disclosure. For example, a
unicycle may include one or more headlights, taillights, reflective
surfaces, hand grips, turn signals, warning lights, and/or audible
warning devices such as a vehicle horn or bell.
[0079] In some examples, a unicycle may include a charging
interface to allow the vehicle to connect to a charging device. The
charging interface may include a connector or a non-contact
magnetic coil for inductive power transfer.
[0080] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle including a centerless wheel.
[0081] Some embodiments of the present disclosure may be described
as a powered vehicle having two motors to allow redundancy,
different speed settings, and/or variable torque without altering
drive gear ratios.
[0082] Some embodiments of the present disclosure may be described
as including a rechargeable lithium-ion battery with an about 20
amp-hour or an about 30 amp-hour capacity mounted within a battery
bay in the wheel. In some embodiments, a prismatic battery
form-factor may be used similar to batteries utilized in some
automotive electric vehicles. In other embodiments, a sealed about
20 amp-hour lead-acid battery may be utilized.
[0083] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having one or more electronic controllers
housed within the wheel above a battery bay. This arrangement may
facilitate heat management by placing the electronic components in
close proximity to the battery, thus shortening the length of
required wiring and reducing associated thermal losses, cable
connectors, and cable failure. In some embodiments, a gyro
controller board may be placed within approximately three inches of
two motor controllers for controlling the electric drive motors,
and the motor controllers may be placed within about eight inches
of the battery and drive motors.
[0084] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having software controls. The vehicle may
include computer hardware and software and the ability to connect
to and interact over a wireless or other network (e.g., wifi,
cellular, 3G, 4G, LTE, cable connector, etc.). The vehicle may
include one or more computing systems that may include standard
features such as a screen, a memory, a processor, a wireless
antenna, etc. The vehicle may also be configured to interact or
interface with a computer, such as a laptop, a tablet, a PDA,
and/or a smartphone.
[0085] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having software controls configured to
control various functions such as remote starting of the vehicle,
lights, radio, security, and/or safety and riding features. The
software may be paired to a smartphone or other computing device
over a network so that the smartphone or other device can interact
with the vehicle to access, monitor, and /or control such
functions.
[0086] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having hardware and software controls
configured to create a wireless hotspot. The vehicle may be paired
to a smartphone or other electronic device such that when the
smartphone is within range of the hotspot, the vehicle may unlock
certain security features. The vehicle may automatically unlock the
security features when the smartphone is in range or upon receiving
an indication from the smartphone to unlock the features (e.g., the
user enters a code indicating to unlock the cycle). In some
embodiments, the vehicle may be on any network and may be paired to
a smartphone or other computing device over such a network to
control, access, or monitor the security features. The vehicle
controller system may have an onboard website that may be presented
to an external wireless-enabled device through the onboard wireless
(e.g., wi-fi) hot spot. Only a standard web browser may be
required.
[0087] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having a speed of approximately 12.5 mph;
a range of approximately 20 miles; two 1,000 W motors for a total
of approximately 2,000 Watts of power; approximately 30 amp-hours
of battery life; and approximately 150 amps of peak current flow to
the motors.
[0088] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having an attitude adjustment, or tilt,
feature. Attitude adjustment may allow the rider to make minor
adjustments in the balance point of a self-balancing vehicle. This
allows the rider to find his or her particular balance point, so
that he or she can easily control the acceleration and deceleration
of the vehicle by leaning forward or backward, respectively. A
balance point may be affected by the rider's personal body geometry
and weight distribution. Additionally, a balance point may be
affected by the terrain, such as when riding up or down a hill. In
these examples, a tilt adjustment may be beneficial to maintain
rider comfort and balance.
[0089] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having an attitude adjustment control with
an up and a down button. Pressing the up attitude adjustment button
may add a small negative offset to the balance point of the
vehicle, causing the nose of the vehicle to pitch up. Pressing the
down attitude adjustment button may add a small positive offset to
the balance point of the vehicle, causing the nose of the vehicle
to pitch down.
[0090] Some embodiments of the present disclosure may be described
as a one-wheeled vehicle having an attitude adjustment system
wherein an offset value is stored in nonvolatile memory, so that
the offset persists between power cycles, allowing a rider to have
the vehicle balanced for riding once the power is turned on and
balance is engaged.
[0091] Based on the above description and the associated drawings,
the following examples in the form of numbered paragraphs describe
various embodiments of apparatuses and methods of the
disclosure.
[0092] A0. A one-wheeled vehicle comprising: [0093] a single wheel
assembly including a single wheel having an axis of rotation and a
rim having an inner circumference, and a tire attached to the rim;
[0094] an electric drive system coupled to the wheel assembly and
substantially contained within the inner circumference of the rim;
[0095] a frame including a body having an extension member
generally extending perpendicular to the axis of rotation of the
wheel, and a fork operatively connected to the body, the fork
having two legs straddling the wheel assembly; [0096] wherein a
distal end of each of the legs of the fork is attached to the wheel
assembly only at a respective connection spaced from the axis of
rotation of the wheel.
[0097] A1. The vehicle of paragraph A0, wherein the vehicle is
configured to travel in an operational mode in which the vehicle
travels with only the single wheel assembly contacting a support
surface.
[0098] A2. The vehicle of paragraph A1, wherein the vehicle is
further configured to convert between the operational mode and a
parked mode in which the frame is rotated about the axis of the
wheel such that the extension member contacts the support surface
and resists lateral toppling of the vehicle.
[0099] A3. The vehicle of paragraph A0, wherein the wheel rotates
about an axle, and each of the distal ends of the fork are attached
to the wheel assembly above the axle relative to the support
surface when the vehicle is in the operational mode.
[0100] A4. The vehicle of paragraph A3, the electric drive system
further comprising a battery, wherein the battery is accessible
through the side of the wheel assembly without interference from
the fork.
[0101] A5. The vehicle of paragraph A3, the wheel assembly further
including a first hub cover disposed over a first lateral side of
the wheel and a second hub cover disposed over a second lateral
side of the wheel opposite the first side, the first hub cover
being affixed to the axle and the second hub cover being affixed to
the drive system.
[0102] A6. The vehicle of paragraph A5, wherein the distal ends of
the fork legs are respectively attached to the first and second hub
covers.
[0103] A7. The vehicle of paragraph A0, wherein the extension
member comprises a hoop structure.
[0104] A8. The vehicle of paragraph A7, wherein the hoop structure
comprises two legs extending generally perpendicular to the axis of
rotation and a crossbar oriented parallel to the axis of rotation
rigidly linking distal ends of the two legs.
[0105] B0. A one-wheeled vehicle comprising: [0106] a wheel
assembly including a single wheel having an axis of rotation and a
rim having an inner circumference; [0107] an electric drive system
coupled to the wheel assembly and substantially contained within
the inner circumference of the rim; [0108] a frame generally
oriented perpendicular to the axis of rotation of the wheel, the
frame having a free end portion and a pivoting end portion; [0109]
a handlebar operatively connected to the free end portion of the
frame; and [0110] a support assembly having a first end pivotably
connected to the pivoting end portion of the frame and a second end
affixed to the wheel assembly; [0111] wherein the frame is
configured to pivot side to side relative to the wheel assembly, as
limited by a mechanical stop.
[0112] B1. The vehicle of paragraph B0, wherein the pivotable
connection between the connector assembly and the frame comprises a
head tube disposed behind a vertical line running through the axis
of rotation.
[0113] B2. The vehicle of paragraph B1, wherein the head tube angle
is about 15 to about 35 degrees relative to vertical.
[0114] B3. The vehicle of paragraph B2, wherein the head tube angle
is about 20 degrees.
[0115] B4. The vehicle of paragraph B1, wherein the vertical line
intersects a support surface at a first point, a line through a
long axis of the head tube intersects the support surface at a
second point, and the head tube is offset from the vertical line
such that the second point is behind the first point relative to a
forward direction of vehicle travel.
[0116] B5. The vehicle of paragraph B0, further comprising a seat
assembly for carrying the weight of a rider, the seat assembly
being operatively connected to the frame between the free end and
the pivoting end.
[0117] B6. The vehicle of paragraph B5, the seat assembly further
comprising an adjustable spring configured to absorb shocks and to
adjust a height of the seat assembly relative to the frame.
[0118] B7. The vehicle of paragraph B0, further comprising a first
bell crank operatively connected to the free end portion of the
frame, a second bell crank operatively connected to the pivoting
end portion of the frame, and a drag link connecting the first bell
crank to the second bell crank, wherein the first bell crank,
second bell crank, frame, and drag link together form a
parallelogram four-bar linkage mechanism.
[0119] B8. The vehicle of paragraph B7, wherein the second bell
crank is fixed, and the handlebar is operatively connected to the
first bell crank, such that the four-bar linkage mechanism is
configured to maintain a substantially constant orientation of the
handlebar relative to the wheel assembly as the frame is pivoted
side to side.
[0120] B9. The vehicle of paragraph B7, the four bar linkage
mechanism further comprising a biasing member configured to bias
the frame toward a neutral side-to-side orientation.
[0121] B10. The vehicle of paragraph B9, wherein the biasing member
comprises a spring, the spring being mounted coaxial to the drag
link.
[0122] C0. A one-wheeled vehicle comprising: [0123] a wheel
assembly including a single wheel having an axis of rotation and a
rim having an inner circumference; [0124] a drive system coupled to
the wheel assembly and including an electric motor; [0125] a
controller for controlling a variable speed and direction of the
electric motor, the controller in electronic communication with an
attitude sensing system; [0126] wherein the drive system,
controller, and attitude sensing system are all substantially
contained within the inner circumference of the rim; and [0127]
further wherein the controller is configured to automatically
adjust the speed and direction of the motor, without a manual
throttle control, to reduce a difference between a pitch measured
by the attitude sensing system and a zero pitch setpoint.
[0128] C1. The vehicle of paragraph C0, further including a first
user input device in electronic communication with the controller,
the first user input device being operable by a user to provide a
selectable attitude offset amount to the controller, wherein the
controller is configured to adjust the zero pitch setpoint by the
offset amount before comparing the adjusted setpoint to the
measured pitch.
[0129] C2. The vehicle of paragraph C1, wherein the first user
input device comprises a two-pushbutton switch mounted to the
handlebar, wherein a first of the two pushbuttons provides a
positive amount of attitude offset and a second of the two
pushbuttons provides a negative amount of attitude offset.
[0130] C3. The vehicle of paragraph C1, wherein the selected
attitude adjustment amount is retained in a nonvolatile memory for
maintaining the adjusted zero pitch setpoint after cycling power to
the controller.
[0131] C4. The vehicle of paragraph C0, wherein the attitude
sensing system comprises a pitch sensor configured to determine an
up and down rotation of the vehicle about an axis parallel to the
axis of rotation of the wheel, and a roll sensor configured to
determine a side to side rotation of the vehicle about an axis
parallel to a direction of vehicle travel.
[0132] C5. The vehicle of paragraph C4, wherein the measured pitch
corresponds to a pitch input received from the pitch sensor.
[0133] C6. The vehicle of paragraph C5, wherein the controller is
configured to compensate for a pitch error in the received pitch
input based on a roll input received from the roll sensor.
[0134] C7. The vehicle of paragraph C4, wherein the controller is
configured to shut off power to the vehicle in response to a
received roll input indicating that the vehicle has fallen
over.
[0135] C8. The vehicle of paragraph C0, further including a second
user input device in electronic communication with the controller,
the second user input device being operable by a user to provide a
selectably variable braking input to the controller.
[0136] C9. The vehicle of paragraph C8, wherein the controller is
configured to slow the vehicle in response to receiving a braking
input from the second user input device, using only a regenerative
braking system.
[0137] C10. The vehicle of paragraph C8, wherein the second user
input device comprises a hand-operated brake lever mounted to the
handlebar.
[0138] The disclosure set forth above may encompass multiple
distinct inventions with independent utility. Although each of
these inventions has been disclosed in its preferred form(s), the
specific embodiments thereof as disclosed and illustrated herein
are not to be considered in a limiting sense, because numerous
variations are possible. The subject matter of the inventions
includes all novel and nonobvious combinations and subcombinations
of the various elements, features, functions, and/or properties
disclosed herein. The following claims particularly point out
certain combinations and subcombinations regarded as novel and
nonobvious. Inventions embodied in other combinations and
subcombinations of features, functions, elements, and/or properties
may be claimed in applications claiming priority from this or a
related application. Such claims, whether directed to a different
invention or to the same invention, and whether broader, narrower,
equal, or different in scope to the original claims, also are
regarded as included within the subject matter of the inventions of
the present disclosure.
* * * * *