U.S. patent application number 09/828415 was filed with the patent office on 2002-10-10 for gearbox structure of a beach cycle.
Invention is credited to Luh, Tai-Yang.
Application Number | 20020144564 09/828415 |
Document ID | / |
Family ID | 25251742 |
Filed Date | 2002-10-10 |
United States Patent
Application |
20020144564 |
Kind Code |
A1 |
Luh, Tai-Yang |
October 10, 2002 |
GEARBOX STRUCTURE OF A BEACH CYCLE
Abstract
A gearbox structure of a beach cycle includes a gearbox which
may transmit a power of an engine to a power shaft and a propeller
shaft. A clutch mounted between the change gears of the gearbox can
be shifted by a gear shift device into a neutral position, a
reverse gear position and a forward gear position. The gear shift
device includes a gear lever which rotates a sector-shaped gear
which rotates a gear shift cam shaft which is formed with a slot
for driving a gear shift drive fork which shifts the clutch to the
neutral position, the reverse gear position, and the forward gear
position. The gearbox is further provided with a force increase
gear, and the propeller shaft is additionally provided with a drive
gear which meshes with a helical gear of a distance calculator
which has a connecting line externally connected to an
odometer.
Inventors: |
Luh, Tai-Yang; (Tai Pei
City, TW) |
Correspondence
Address: |
Alan Kamrath
RIDER BENNETT EGAN & ARUNDEL, LLP
333 South Seventh Street, Suite 2000
Minneapolis
MN
55402
US
|
Family ID: |
25251742 |
Appl. No.: |
09/828415 |
Filed: |
April 6, 2001 |
Current U.S.
Class: |
74/337.5 ; 74/12;
74/363 |
Current CPC
Class: |
Y10T 74/19428 20150115;
F16H 63/18 20130101; Y10T 74/1927 20150115; F16H 61/662 20130101;
Y10T 74/19279 20150115; F16H 37/021 20130101 |
Class at
Publication: |
74/337.5 ;
74/363; 74/12 |
International
Class: |
F16H 063/18; F16H
003/091 |
Claims
What is claimed is:
1. A gearbox structure of a beach cycle comprising: a gearbox for
transmitting a power of an engine through a CVT gear shift to a
power shaft which is fitted with a propeller shaft, said power
shaft and said propeller shaft directly meshing with each other
through a reduction gear and change gears mounted on a gear shift
shaft, and through steering gears mounted on a steering shaft, said
change gears including a backward used change gear, and a forward
used change gear, said propeller shaft provided with a forward used
drive gear meshing with said forward used change gear, said gear
shift shaft having an outer periphery formed with outer splines, a
first clutch slidably mounted on said outer splines of said gear
shift shaft, said first clutch formed with locking blocks engaged
with locking blocks formed on said change gears, so that said first
clutch can be shifted by a gear shift device into a neutral
position, a reverse gear position and a forward gear position, said
gear shift device including a gear lever which rotates a
sector-shaped gear which meshes and rotates a gear shift cam shaft
which is formed with a first slot having a track variation for
driving a first gear shift drive fork which drives and shifts said
first clutch to said neutral position, said reverse gear position,
and said forward gear position, said gearbox provided with a
positioning spring, and a positioning ball, said gear shift cam
shaft formed with positioning recesses each mating with a
respective gear position and each co-operating with said
positioning spring, and said positioning ball, so that said gear
shift cam shaft can be rotated to a correct gear position; wherein,
said gear shift shaft is provided with a force increase used change
gear, said propeller shaft is provided with a force increase used
drive gear meshing with force increase used change gear, said gear
shift cam shaft is formed with a second slot having a track
variation for driving a second gear shift drive fork which drives
and shifts a second clutch to a force increase gear position where
said second clutch meshes with and rotates said force increase used
change gear which meshes with and rotates said force increase used
drive gear, so that said power of said engine is transmitted
through said reduction gear and said force increase used change
gear of said gear shift shaft to said force increase used drive
gear of said propeller shaft.
2. The gearbox structure of a beach cycle in accordance with claim
1, wherein said propeller shaft in said gearbox is additionally
provided with a drive gear which meshes with a helical gear of a
distance calculator which has a connecting line externally
connected to an odometer.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a gearbox structure of a
beach cycle, and more particularly to a gearbox structure of a
beach cycle, wherein the gearbox is further provided with a force
increase gear, and the propeller shaft is additionally provided
with a drive gear which meshes with a helical gear of a distance
calculator which has a connecting line externally connected to an
odometer.
[0003] 2. Description of the Related Prior Art
[0004] A conventional beach cycle in accordance with the prior art
uses a CVT gear shift to transmit the power of the engine into the
gearbox. The conventional beach cycle usually includes a forward
gear only, without a force increase gear, so that when the beach
cycle is trapped in a muddy situation, it cannot move forward
easily. In addition, the distance calculator used for the odometer
is mounted outside of the gearbox of the conventional beach cycle,
so that the distance calculator is easily worn out.
SUMMARY OF THE INVENTION
[0005] The primary objective of the present invention is to provide
a gearbox structure of a beach cycle, wherein the gearbox is
further provided with a force increase gear, and the propeller
shaft is additionally provided with a drive gear which meshes with
a helical gear of a distance calculator which has a connecting line
externally connected to an odometer.
[0006] In accordance with the present invention, there is provided
a gearbox structure of a beach cycle comprising:
[0007] a gearbox for transmitting a power of an engine through a
CVT gear shift to a power shaft which is fitted with a propeller
shaft, the power shaft and the propeller shaft directly meshing
with each other through a reduction gear and change gears mounted
on a gear shift shaft, and through steering gears mounted on a
steering shaft, the change gears including a backward used change
gear, and a forward used change gear, the propeller shaft provided
with a forward used drive gear meshing with the forward used change
gear, the gear shift shaft having an outer periphery formed with
outer splines, a first clutch slidably mounted on the outer splines
of the gear shift shaft, the first clutch formed with locking
blocks engaged with locking blocks formed on the change gears, so
that the first clutch can be shifted by a gear shift device into a
neutral position, a reverse gear position and a forward gear
position, the gear shift device including a gear lever which
rotates a sector-shaped gear which meshes and rotates a gear shift
cam shaft which is formed with a first slot having a track
variation for driving a first gear shift drive fork which drives
and shifts the first clutch to the neutral position, the reverse
gear position, and the forward gear position, the gearbox provided
with a positioning spring, and a positioning ball, the gear shift
cam shaft formed with positioning recesses each mating with a
respective gear position and each co-operating with the positioning
spring, and the positioning ball, so that the gear shift cam shaft
can be rotated to a correct gear position;
[0008] wherein, the gear shift shaft is provided with a force
increase used change gear, the propeller shaft is provided with a
force increase used drive gear meshing with force increase used
change gear, the gear shift cam shaft is formed with a second slot
having a track variation for driving a second gear shift drive fork
which drives and shifts a second clutch to a force increase gear
position where the second clutch meshes with and rotates the force
increase used change gear which meshes with and rotates the force
increase used drive gear, so that the power of the engine is
transmitted through the reduction gear and the force increase used
change gear of the gear shift shaft to the force increase used
drive gear of the propeller shaft.
[0009] Further benefits and advantages of the present invention
will become apparent after a careful reading of the detailed
description with appropriate reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is an exploded perspective view of a gearbox
structure of a beach cycle in accordance with the present
invention;
[0011] FIG. 2 is a cross-sectional assembly view of the gearbox
structure of a beach cycle as shown in FIG. 1, wherein the gearbox
structure is disposed at a neutral status;
[0012] FIG. 3 is a cross-sectional assembly view of the gearbox
structure of a beach cycle as shown in FIG. 1, wherein the gearbox
structure is disposed at a reverse gear status;
[0013] FIG. 4 is a schematic view of a gear shift cam shaft of the
gearbox structure of a beach cycle in accordance with the present
invention;
[0014] FIG. 5 is a cross-sectional assembly view of the gearbox
structure of a beach cycle as shown in FIG. 1, wherein the gearbox
structure is disposed at a force increase gear status; and
[0015] FIG. 6 is a plan assembly view of the gearbox structure of a
beach cycle as shown in FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
[0016] Referring to the drawings and initially to FIGS. 1 and 2, a
gearbox structure of a beach cycle in accordance with the present
invention is shown, wherein FIG. 2 shows that the gearbox structure
of a beach cycle in accordance with the present invention is
disposed at a neutral status. The gearbox 10 transmits the power of
the engine through the CVT gear shift 101 to the power shaft 11
which is fitted and combined with the propeller shaft 12, so that
the power shaft 11 and the propeller shaft 12 may present a
relative movement therebetween. The power shaft 11 includes a drive
gear 13 meshing with the reduction gear 21 of a gear shift shaft 20
to drive and rotate the reduction gear 21. The gear shift shaft 20
is serially provided with a backward used change gear 22, a forward
used change gear 23, and a force increase used change gear 24. The
gear shift shaft 20 has an outer periphery formed with outer
splines 25 between the backward used change gear 22, the forward
used change gear 23, and the force increase used change gear 24, so
that two sets of clutches 30 may be mounted between the backward
used change gear 22, the forward used change gear 23, and the force
increase used change gear 24. Each clutch 30 is formed with inner
splines 31, and the reduction gear 21 is formed with inner splines
26. The clutches 30 are provided with locking blocks 32, while the
backward used change gear 22, the forward used change gear 23, and
the force increase used change gear 24 are also provided with
locking blocks 27, so that the clutches 30 may be displaced on the
outer splines 25 of the gear shift shaft 20 to selectively mesh
with and drive one of the backward used change gear 22, the forward
used change gear 23, and the force increase used change gear 24,
thereby forming four different gear positions including the neutral
status, the reverse gear status, the forward gear status, and the
force increase gear status. The propeller shaft 12 is provided with
a forward used drive gear 14, and a force increase used drive gear
15 to respectively mesh with the forward used change gear 23, and
the force increase used change gear 24 of the gear shift shaft
20.
[0017] FIG. 3 shows that the gearbox structure in accordance with
the present invention is disposed at a reverse gear status. The
backward used change gear 22 and the steering gear 41 of the
steering shaft 40 mesh with each other, and another steering gear
42 of the steering shaft 40 and the force increase used drive gear
15 mesh with each other.
[0018] Each clutch 30 has an outer wall formed with an insertion
groove 33 for receiving a first end of a gear shift drive fork 34
that is mounted on an axle 35. The second end of each of the two
gear shift drive forks 34 is provided with a positioning post 36
which may slide with the track a respective one of two slots 51 and
52 formed in the periphery of a gear shift cam shaft 50. Referring
to FIG. 4, the slot 51 is formed by a continuous track including a
high stage, a middle stage, and a low stage, and the slot 52 is
formed by a continuous track including a middle stage, and a low
stage. The slots 51 and 52 respectively indicate different gear
positions, including a reverse gear "R", a neutral status "N", a
forward gear "H", and a force increase gear "L".
[0019] FIG. 5 shows that the gearbox structure in accordance with
the present invention is disposed at a force increase gear status.
When the beach cycle is deeply trapped and cannot move, the gearbox
structure can be shifted to the force increase gear "L". Then, the
locking blocks 32 of the clutch 30 and the locking blocks 27 of the
force increase used change gear 24 are locked with each other to
drive, so that the force increase used change gear 24 that has
smaller teeth may drive the force increase used drive gear 15 that
has larger teeth, thereby achieving a force increase effect with a
low rotational speed and a large torsion, so that the beach cycle
can detach from the trap conveniently.
[0020] Referring to FIG. 6, for shifting and displacing the
different gear positions accurately, the gearbox 10 is provided
with a positioning spring 16, and a positioning ball 17. The gear
shift cam shaft 50 is formed with multiple positioning recesses 53
to mate with the respective gear position. When the gear lever 60
is pivoted to rotate a sector-shaped gear 61 that meshes with a
gear mounted on the gear shift cam shaft 50, the gear shift cam
shaft 50 is rotated to the correct gear position.
[0021] In addition, the propeller shaft 12 in the gearbox 10 is
additionally provided with a drive gear 18 which meshes with the
helical gear 71 of a distance calculator 70, and the connecting
line 72 of the distance calculator 70 is externally connected to an
odometer (not shown). In such a manner, the distance calculator 70
is mounted in the gearbox 10.
[0022] Although the invention has been explained in relation to its
preferred embodiment as mentioned above, it is to be understood
that many other possible modifications and variations can be made
without departing from the scope of the present invention.
* * * * *