U.S. patent application number 15/096592 was filed with the patent office on 2017-10-12 for vehicle door assist assembly incorporating a high torque operating mechanism.
This patent application is currently assigned to Ford Global Technologies, LLC. The applicant listed for this patent is Ford Global Technologies, LLC. Invention is credited to Larry Dean Elie, John Wayne Jaranson, Timothy J. Potter.
Application Number | 20170291477 15/096592 |
Document ID | / |
Family ID | 59982102 |
Filed Date | 2017-10-12 |
United States Patent
Application |
20170291477 |
Kind Code |
A1 |
Elie; Larry Dean ; et
al. |
October 12, 2017 |
VEHICLE DOOR ASSIST ASSEMBLY INCORPORATING A HIGH TORQUE OPERATING
MECHANISM
Abstract
A vehicle includes a door frame coupled to a vehicle frame at a
hinge. A door operating mechanism is coupled to the door and
vehicle frames for applying rotational force to the door frame
about the hinge. The door operating mechanism including external
cogs of an inner gear that mesh with inner cogs of an outer gear
and a single oblong bearing that biases the inner gear in partial
engagement with the outer gear.
Inventors: |
Elie; Larry Dean;
(Ypsilanti, MI) ; Potter; Timothy J.; (Dearborn,
MI) ; Jaranson; John Wayne; (Dearborn, MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ford Global Technologies, LLC |
Dearborn |
MI |
US |
|
|
Assignee: |
Ford Global Technologies,
LLC
Dearborn
MI
|
Family ID: |
59982102 |
Appl. No.: |
15/096592 |
Filed: |
April 12, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E05Y 2900/531 20130101;
E05F 15/614 20150115; B60J 5/0473 20130101; E05F 15/00
20130101 |
International
Class: |
B60J 5/04 20060101
B60J005/04 |
Claims
1. A vehicle comprising: a door frame coupled to a vehicle frame at
a hinge; and a door operating mechanism coupled to the door and
vehicle frames for applying rotational force to the door frame
about the hinge, the door operating mechanism including external
cogs of an inner gear that mesh with inner cogs of an outer gear
and a single oblong bearing that biases the inner gear in partial
engagement with the outer gear.
2. The vehicle of claim 1, wherein the external cogs of the inner
gear define a flexible spline, and wherein the inner cogs of the
outer gear define a rigid circular spline.
3. The vehicle of claim 1, wherein a housing of the door operating
mechanism is coupled to one of the door frame and the vehicle
frame, and wherein the inner gear is coupled to a hinge plate
extending to the other of the door frame and the vehicle frame.
4. The vehicle of claim 2, wherein the oblong bearing includes
opposing engaging portions that define a major axis of the oblong
bearing, wherein the engaging portions engage an interior surface
of the inner gear, wherein engagement of the engaging portions with
the interior surface outwardly deflects corresponding meshing
portions of the flexible spline into engagement with the circular
spline.
5. The vehicle of claim 1, wherein the oblong bearing slidably
rotates within the inner gear at a first rotational speed, wherein
operation of the oblong bearing rotates the inner gear within the
outer gear in a meshing engagement between the external cogs and
the inner cogs.
6. The vehicle of claim 1, wherein a single rotation of the inner
gear within the outer gear is produced by a predetermined number of
rotations of the oblong bearing within the inner gear, wherein the
predetermined number of rotations is within a range of from
approximately 300 to approximately 400 rotations of the oblong
bearing.
7. The vehicle of claim 1, wherein the external cogs of the inner
gear includes a first set of cogs, and wherein the inner cogs of
the outer gear defines a second set of cogs, wherein the second set
of cogs outnumbers the first set of cogs.
8. The vehicle of claim 3, wherein the door operating mechanism
includes a motor having a drive shaft that extends to the oblong
bearing, and wherein the inner gear is coupled to the hinge plate,
and wherein operation of the motor delivers a rotational force to
the hinge plate via a gear reduction interface defined between the
oblong bearing and the inner and outer gears.
9. The vehicle of claim 1, wherein the door operating mechanism is
coupled to a top portion of the hinge.
10. The vehicle of claim 8, wherein the motor, the inner and outer
gears and the oblong bearing are disposed within a door cavity
defined by the door frame.
11. The vehicle of claim 1, wherein the rotational force applied by
the door operating mechanism is an opposing force that at least
partially slows a rotation of the door frame relative to the
vehicle frame.
12. A door operating mechanism for operating a vehicle door
comprising: a motor coupled to a gear-reduction interface having an
oblong bearing that slidably rotates within a flexible spline that
operates in a meshing engagement within a circular spline; and a
hinge plate in communication with the flexible spline, wherein the
motor operates the oblong bearing to deliver a rotational force of
the motor to the hinge plate via the gear-reduction interface.
13. The door operating mechanism of claim 12, wherein the oblong
bearing includes opposing engaging sides that slidably engage an
interior surface of the flexible spline, wherein engagement of the
opposing engaging sides with the interior surface outwardly
deflects corresponding portions of the flexible spline into meshing
engagement with the circular spline.
14. The door operating mechanism of claim 12, wherein a first set
of cogs are defined within an outer-facing surface of the flexible
spline, and wherein a second set of cogs are defined within an
inward-facing surface of the circular spline, wherein the first set
of cogs and the second set of cogs define a meshing relationship,
and wherein the second set of cogs outnumbers the first set of
cogs.
15. The door operating mechanism of claim 12, wherein the circular
spline is in a fixed position relative to the motor.
16. The door operating mechanism of claim 12, wherein a single
rotation of the flexible spline within the circular spline is
produced by a predetermined number of rotations of the oblong
bearing within the flexible spline, wherein the predetermined
number of rotations is within a range of from approximately 300 to
approximately 400 rotations of the oblong bearing.
17. The door operating mechanism of claim 12, wherein the
gear-reduction interface is adapted to be attached to a door frame,
and wherein the hinge plate is adapted to be attached to a vehicle
frame, and wherein operation of the motor operates the gear
reduction interface and the hinge plate to move the gear reduction
interface along with the door frame relative to the vehicle
frame.
18. The door operating mechanism of claim 14, wherein the first set
of cogs are defined within the outer-facing surface of the flexible
spline, and wherein a second set of cogs are defined within an
inward-facing surface of the circular spline, wherein the first set
of cogs and the second set of cogs define a meshing relationship,
and wherein the second set of cogs outnumbers the first set of
cogs.
19. A hinge assembly for a vehicle door comprising: a motor coupled
to a door frame and adapted to apply a rotational force thereto
relative to a vehicle frame; an oblong bearing rotationally coupled
to the motor; a flexible inner gear having an interior surface that
receives at least a portion of the oblong bearing; a rigid outer
gear having inner cogs that mesh with external cogs of the flexible
inner gear, wherein rotation of the oblong bearing meshes the
external cogs with the inner cogs resulting in rotation of the
flexible inner gear relative to the rigid outer gear, wherein the
flexible inner gear is coupled with a hinge plate that is attached
to the vehicle frame.
20. The hinge assembly of claim 19, wherein the oblong bearing
includes a plurality of bearings disposed along an outer portion of
the oblong bearing, wherein operation of the oblong bearing causes
rotation of the plurality of bearings along the interior surface of
the flexible inner gear.
Description
FIELD OF THE INVENTION
[0001] The present invention generally relates to vehicle doors,
and more specifically, an automatic door operating mechanism having
a high-torque drive.
BACKGROUND OF THE INVENTION
[0002] Various automobiles include doors that incorporate
door-assist mechanisms that are used to open, close, or otherwise
assist the user in operating any one or more of the doors of the
vehicle. Such operating mechanisms typically include motors that
assist in rotating a door or stop the rotation of a door upon the
needs of the user.
SUMMARY OF THE INVENTION
[0003] According to one aspect of the present invention, a vehicle
includes a door frame coupled to a vehicle frame at a hinge. A door
operating mechanism is coupled to the door and vehicle frames for
applying rotational force to the door frame about the hinge. The
door operating mechanism including external cogs of an inner gear
that mesh with inner cogs of an outer gear and a single oblong
bearing that biases the inner gear in partial engagement with the
outer gear.
[0004] According to another aspect of the present invention, a door
operating mechanism for operating a vehicle door includes a motor
coupled to a gear-reduction interface having an oblong bearing that
slidably rotates within a flexible spline that operates in a
meshing engagement within a circular spline. A hinge plate is in
communication with the flexible spline, wherein the motor operates
the oblong bearing to deliver a rotational force of the motor to
the hinge plate via the gear-reduction interface.
[0005] According to another aspect of the present invention, a
hinge assembly for a vehicle door includes a motor coupled to a
door frame and adapted to apply a rotational force thereto relative
to a vehicle frame. An oblong bearing is rotationally coupled to
the motor. A flexible inner gear has an interior surface that
receives at least a portion of the oblong bearing. A rigid outer
gear has inner cogs that mesh with external cogs of the flexible
inner gear. Rotation of the oblong bearing meshes the external cogs
with the inner cogs resulting in rotation of the flexible inner
gear relative to the rigid outer gear. The flexible inner gear is
coupled with a hinge plate that is attached to the vehicle
frame.
[0006] These and other aspects, objects, and features of the
present invention will be understood and appreciated by those
skilled in the art upon studying the following specification,
claims, and appended drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] In the drawings:
[0008] FIG. 1 is a side perspective view of a vehicle incorporating
an aspect of the door operating mechanism and illustrating the door
in the open position;
[0009] FIG. 2 is a cross-sectional view of a door and vehicle frame
incorporating an aspect of the door operating mechanism within a
cavity of the door;
[0010] FIG. 3 is a partially exploded view of an aspect of the door
operating mechanism;
[0011] FIG. 4 is a schematic cross-sectional view of an aspect of a
gearing mechanism for the door operating mechanism illustrating the
gearing mechanism at a start position;
[0012] FIG. 5 is a schematic cross-sectional view of the gearing
mechanism of FIG. 4 illustrating the rotation of the gearing
mechanism 90 degrees from the start position;
[0013] FIG. 6 is a schematic cross-sectional view of the gearing
mechanism of FIG. 4 illustrating a 180 degree rotation of the
gearing mechanism from the start position;
[0014] FIG. 7 is a perspective cross-sectional view of the vehicle
door of FIG. 4;
[0015] FIG. 8 is a perspective cross-sectional view of a vehicle
door incorporating an aspect of the door operating mechanism
engaged with a vehicle frame;
[0016] FIG. 9 is a schematic cross-sectional view of a door
incorporating an aspect of the door operating mechanism and showing
operation of the door between open and closed positions; and
[0017] FIG. 10 is a schematic cross-sectional view of the door of
FIG. 2 and illustrating the rotation of the door being stopped by
the door operating mechanism.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0018] For purposes of description herein, the terms "upper,"
"lower," "right," "left," "rear," "front," "vertical,"
"horizontal," and derivatives thereof shall relate to the invention
as oriented in FIG. 1. However, it is to be understood that the
invention may assume various alternative orientations, except where
expressly specified to the contrary. It is also to be understood
that the specific devices and processes illustrated in the attached
drawings, and described in the following specification are simply
exemplary embodiments of the inventive concepts defined in the
appended claims. Hence, specific dimensions and other physical
characteristics relating to the embodiments disclosed herein are
not to be considered as limiting, unless the claims expressly state
otherwise.
[0019] As shown in FIGS. 1-6, reference numeral 10 generally refers
to a door operating mechanism attached to a hinge 12 for operating
a vehicle door 14 about a vertical axis 16 relative to a vehicle
frame 18, according to at least one embodiment. The vehicle 20 can
include a door frame 22 that is coupled to the vehicle frame 18 at
the hinge 12. The door operating mechanism 10 is coupled to the
door frame 22 and the vehicle frame 18 for applying rotational
force 24 to the door frame 22 about the hinge 12. It is
contemplated that the door operating mechanism 10 includes external
cogs 26 of an inner gear 28 that mesh with inner cogs 30 of an
outer gear 32, and a single oblong bearing 34 that biases the inner
gear 28 into partial engagement with the outer gear 32. As the
oblong bearing 34 is rotated by a motor 36 of the door operating
mechanism 10, the oblong bearing 34 deforms the inner gear 28 to
bias different meshing portions 38 of the inner gear 28 into
partial engagement with the outer gear 32. In this manner, at least
two meshing portions 38 of the inner gear 28 are always in
engagement with the outer gear 32, where these meshing portions 38
continuously change during operation of the oblong bearing 34. It
is contemplated that the external cogs 26 of the inner gear 28
define a flexible spline 40 and the inner cogs 28 of the outer gear
32 define a rigid circular spline 42.
[0020] Referring again to FIGS. 1-6, the oblong bearing 34 can
include opposing engaging portions 50 that define a major axis 52
of the oblong bearing 34. In such an embodiment, the engaging
portions 50 of the oblong bearing 34 engage an interior surface 54
of the inner gear 28. In this manner, engagement of the engaging
portions 50 of the oblong bearing 34 with the interior surface 54
of the inner gear 28 outwardly deflects corresponding meshing
portions 38 of the flexible spline 40 into engagement with the
rigid circular spline 42. Accordingly, the oblong bearing 34
slidably rotates within the inner gear 28 at a first rotational
speed 56. Operation of the oblong bearing 34 at the first
rotational speed 56 serves to rotate the inner gear 28 at a
different and slower second rotational speed 58 of the inner gear
28 having the flexible spline 40 that meshes within the outer gear
32. The outer gear 32 is defined by the rigid circular spline 42
and a meshing engagement between the external cogs 26 and the inner
cogs 30 results from the engagement of the inner and outer gears
28, 32.
[0021] Referring now to FIGS. 3-6, the external cogs 26 of the
inner gear 28 include a first set of cogs 70. The inner cogs 30 of
the outer gear 32 define a second set of cogs 72, wherein the
second set of cogs 72 outnumber the first set of cogs 70.
Typically, the number of cogs in the second set of cogs 72 will
only slightly outnumber the number of cogs in the first set of cogs
70. In this manner, a single rotation of the oblong bearing 34
serves to rotate the inner gear 28 only a minimal distance relative
to the outer gear 32. This minimal rotational movement 74 of the
inner gear 28 relative to the outer gear 32 serves to deliver a
high amount of torque 76 based upon the much greater rotational
movement 74 of the oblong bearing 34. Accordingly, a single
rotation of the inner gear 28 within the outer gear 32 can be
produced by a predetermined number of rotations of the oblong
bearing 34 within the inner gear 28. By way of example, and not
limitation, the predetermined number of rotations can be in the
range of from approximately 300 rotations to approximately 400
rotations of the oblong bearing 34 to produce a single rotation of
the inner gear 28 relative to the outer gear 32. Through this
configuration, the motor 36 can operate the oblong bearing 34 at a
high rate of speed and with minimal force that can be achieved by a
much smaller motor 36 than that used in conventional door-assist
mechanisms. This low torque 76 and high-speed rotational movement
74 of the oblong bearing 34 produces a much slower rotational
movement 74 of the inner gear 28 relative to the outer gear 32, but
at a much higher output torque 76 for rotating an output shaft 78
that can be coupled to a hinge plate 80 of the hinge 12 extending
between the door frame 22 and the vehicle frame 18. As such, the
door operating mechanism 10 can achieve very high torque 76 having
drive ratios that can be within a range of from approximately 30:1
to 100:1 or as high as from approximately 300:1 to approximately
400:1.
[0022] According to the various embodiments, the high gear ratios
provided by the gear interface provides a low-speed rotational
movement 74 and high output torque 76 that can result in precise
and responsive movements of the door frame 22 and the vehicle door
14 about the hinge 12. Because typical vehicle doors 14 include
multiple structural, safety and mechanical features, they have a
large mass that can be difficult to rotate, or stop rotation, about
the hinge 12 between open and closed positions 122, 124. The high
output torque 76 of the gear reduction interface 100 provides
sufficient torque 76 to rotate or stop the rotation of the vehicle
door 14. Additionally, the low speed output of the gear reduction
interface 100 provides for a controlled and precise movement of the
vehicle door 14 that can correspond to smooth and quiet operation
of the gear reduction interface 100 and the vehicle door 14. In
this manner, the opening and closing force 130, 132 of the vehicle
door 14 can be precisely controlled.
[0023] Referring again to FIGS. 2-7, the door operating mechanism
10 includes the motor 36 having a drive shaft 90 that extends to
the oblong bearing 34. It is contemplated that the drive shaft 90
can include a keyed geometry that can include one or more notches
92 to prevent slippage of the drive shaft 90 within the oblong
bearing 34. The oblong bearing 34 can include a matching geometry
that includes a notch receptacle 94 for accepting the notch 92
defined within the drive shaft 90. The inner gear 28 can be coupled
to the hinge plate 80 of the hinge 12, wherein operation of the
motor 36 delivers an input rotational force 96 to the hinge plate
80 via the gear reduction interface 100 defined between the oblong
bearing 34, the inner gear 28 and the outer gear 32. This
configuration minimizes the use of more complex gearing mechanisms
that may include planet/sun gears, complex transmission mechanisms,
and other gearing mechanisms having multiple components for
transferring input rotational force 96 from a motor 36 to an output
torque 76 of the output shaft 78. According to the various
embodiments, the drive mechanism including the oblong bearing 34,
the inner gear 28 and outer gear 32 provides a high output torque
76 through the use of a minimal number of components disposed
between the motor 36 and the output shaft 78 of the door operating
mechanism 10. Additionally, a minimally sized motor 36 can produce
a small input rotational force 96 that can be modulated to a high
output torque 76.
[0024] Referring again to FIGS. 2-7, it is contemplated that the
drive shaft 90 of the door operating mechanism 10 can be coupled to
a top portion 110 of the hinge 12, defined by a top hinge plate
112. The top hinge plate 112 is typically disposed in a central
position along a height of the vehicle door 14. In this manner, the
transfer of output torque 76 from the door operating mechanism 10,
through the hinge plate 80 and to the vehicle frame 18 can be
positioned at a substantially central portion 114 of the vehicle
door 14. It should be contemplated that the door operating
mechanism 10 can be disposed at a higher or lower portion of the
hinge 12 of the door frame 22 depending upon the needs of the user
and the configuration of the particular vehicle door 14. It is
further contemplated that the motor 36, the inner gear 28, outer
gear 32 and oblong bearing 34 are all disposed within a door cavity
120 defined within the door frame 22. In this manner, the
components of the door operating mechanism 10 can be hidden from
view during use of the vehicle door 14 in both the open and closed
positions 122, 124.
[0025] According to the various embodiments, as exemplified in
FIGS. 1, 9 and 10, the door operating mechanism 10 can be used for
applying an opening force 130 for rotating the vehicle door 14 away
from the vehicle frame 18. The door operating mechanism 10 can also
be used for applying a closing force 132 to the vehicle door 14 for
moving the door frame 22 closer to the vehicle frame 18 toward a
closed position 124. These various movements of the door operating
mechanism 10 for transferring output torque 76 as a rotational
force 24 applied to the door frame 22 relative to the vehicle frame
18 can be incorporated at various points during the rotation of the
vehicle door 14 relative to the frame of the vehicle 20. By way of
example, and not limitation, the door operating mechanism 10 can be
activated to define a soft close feature of the vehicle door 14,
such that when the vehicle door 14 is near the closed position 124,
the door operating mechanism 10 activates to slowly move the door
into the closed position 124 from an ajar position 140. It is also
contemplated that the door operating mechanism 10 can include a
collision prevention feature of the vehicle door 14. In such an
embodiment, a proximity sensor 134 disposed within the vehicle door
14 can alert a processor disposed within the vehicle 20 to activate
the door operating mechanism 10. The door operating mechanism 10
can then exert an opposing door-stopping force 142 to the vehicle
door 14 that opposes the opening or closing force 132 of the
vehicle door 14 to prevent collision of an outer surface 150 of the
vehicle door 14 with an obstruction 152 or collision of an inner
surface 154 of the vehicle door 14 with the occupant as the vehicle
door 14 is moving to the closed position 124. It is also
contemplated that the door operating mechanism 10 can be used as an
automatic opening or closing feature for automatically rotating the
vehicle door 14 between open and closed positions 122, 124.
Moreover, it is contemplated that the output torque 76 applied by
the door operating mechanism 10 can be an opposing force that at
least partially slows or stops the rotation of the door frame 22
relative to the vehicle frame 18. As discussed above, such slowing
or stopping of the opening or closing force 132 of the vehicle door
14 can be used to avoid collision with an exterior obstruction 152
or an obstruction 152 between the door frame 22 and the vehicle
frame 18, such as an occupant's body part or other object that may
be blocking the movement of the vehicle door 14 between open and
closed positions 122, 124.
[0026] Referring again to FIGS. 2-7, the door operating mechanism
10 for operating the vehicle door 14 can include the motor 36 that
is coupled to the gear reduction interface 100 that includes the
oblong bearing 34 that slidably rotates within the flexible spline
40. Through this engagement, the oblong bearing 34 rotates within
the flexible spline 40 to operate the flexible spline 40 in a
meshing engagement with a rigid circular spline 42 defined by the
outer gear 32. The hinge plate 80 is configured to be in
communication with the flexible spline 40 via the output shaft 78.
In this manner, the motor 36 operates the oblong bearing 34 to
deliver the input rotational force 96 of the motor 36 to the hinge
plate 80, via the gear reduction interface 100. It is contemplated
that the first set of cogs 70 can be defined within the
outer-facing surface 170 of the flexible spline 40 and the second
set of cogs 72 can be defined within an inward-facing surface 172
of the circular spline 42. The first set of cogs 70 and the second
set of cogs 72 define a meshing relationship, where the second set
of cogs 72 outnumbers, typically slightly, the first set of cogs
70. According to the various embodiments, as the flexible spline 40
moves within the circular spline 42, the circular spline 42 defines
a rigid member that is disposed in a fixed position relative to the
motor 36. In this manner, operation of the motor 36 serves to
rotate the oblong bearing 34 and results in the deformation and
simultaneous rotation of the flexible spline 40 relative to the
fixed and rigid circular spline 42. Through this system, the gear
reduction interface 100 is adapted to be attached to a door frame
22, and the hinge plate 80 is adapted to be attached to the vehicle
frame 18. Operation of the motor 36 operates the gear reduction
interface 100 and the hinge plate 80 to move the gear reduction
interface 100 along with the door frame 22 relative to the vehicle
frame 18. Stated another way, operation of the motor 36 serves to
move the motor 36 and the gear reduction interface 100 disposed
within a housing 180 of the motor 36 about the hinge 12 along with
the door frame 22. It is contemplated, in various embodiments, that
the motor 36 and the various components of the gear reduction
interface 100 can be attached to the vehicle frame 18, such that
operation of the door operating mechanism 10 causes rotation of the
vehicle door 14 around the hinge 12, while the motor 36 and motor
housing 180 remain in a fixed position relative to the vehicle
frame 18.
[0027] Referring again to FIGS. 1-10, the hinge 12 for the vehicle
door 14 can include the motor 36 that is coupled to the door frame
22. The motor 36 is adapted to apply the input rotational force 96
to the door frame 22 to operate the door frame 22 relative to a
vehicle frame 18. An oblong bearing 34 is rotationally coupled to
the motor 36 and directly receives the input rotational force 96 of
the motor 36. A flexible inner gear 28 includes an interior surface
54 that receives at least a portion of the oblong bearing 34. A
rigid outer gear 32 includes inner cogs 30 that mesh with the
meshing portions 38 of external cogs 26 of the flexible inner gear
28. Rotation of the oblong bearing 34 meshes the external cogs 26
with the inner cogs 30, which results in rotation of the flexible
inner gear 28 relative to the rigid outer gear 32. It is
contemplated that the flexible inner gear 28 can be coupled with a
hinge plate 80 that is attached to the vehicle frame 18. When the
motor 36 is activated, the input rotational force 96 of the motor
36 is transferred through the oblong bearing 34, causing rotation
of the flexible inner gear 28, that is transferred to the vehicle
frame 18. Accordingly, the rotation of the flexible inner gear 28
causes the hinge plate 80 to rotate and, in turn, operate the
vehicle door 14 relative to the vehicle frame 18 between the open
and closed positions 122, 124.
[0028] Referring again to FIGS. 3-6, the sliding engagement between
the oblong bearing 34 and the flexible inner gear 28 can be through
various sliding mechanisms 190 that can include, but are not
limited to, a lubricated sliding interface, cylindrical bearings,
spherical bearings, combinations thereof, and other similar sliding
mechanisms 190 that allow for the rotational movement 74 of the
oblong bearing 34 within the flexible inner gear 28. It is
contemplated that the sliding mechanism 190 can include a plurality
of bearings disposed along an outer portion of the oblong bearing
36. Operation of the oblong bearing 34 causes rotation of the
plurality of bearings along the interior surface 54 of the flexible
inner gear 28.
[0029] According to the various embodiments, the oblong bearing 34
can be shaped in various oblong configurations that can include,
but are not limited to, elliptical, oval, egg-shaped, a
rounded-rectangle configuration, irregular, combinations thereof,
and other similar oblong configurations that provide for only
partial engagement of the flexible inner gear 28 with the rigid
outer gear 32. It is contemplated that the rigid outer gear 32 can
be made of various rigid materials that can include, but are not
limited to, metals, metal alloys, composites, polymers, and other
substantially rigid materials that can include inner cogs 30 that
can mesh with the external cogs 26 of the flexible inner gear
28.
[0030] It is to be understood that variations and modifications can
be made on the aforementioned structure without departing from the
concepts of the present invention, and further it is to be
understood that such concepts are intended to be covered by the
following claims unless these claims by their language expressly
state otherwise.
* * * * *