KR20160005903A - Cycle with two wheel driving mechanism - Google Patents

Cycle with two wheel driving mechanism Download PDF

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Publication number
KR20160005903A
KR20160005903A KR1020140084966A KR20140084966A KR20160005903A KR 20160005903 A KR20160005903 A KR 20160005903A KR 1020140084966 A KR1020140084966 A KR 1020140084966A KR 20140084966 A KR20140084966 A KR 20140084966A KR 20160005903 A KR20160005903 A KR 20160005903A
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KR
South Korea
Prior art keywords
ratchet
bearing
drive shaft
wheel
rear drive
Prior art date
Application number
KR1020140084966A
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Korean (ko)
Inventor
김현옥
Original Assignee
김현옥
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Filing date
Publication date
Application filed by 김현옥 filed Critical 김현옥
Priority to KR1020140084966A priority Critical patent/KR20160005903A/en
Publication of KR20160005903A publication Critical patent/KR20160005903A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K13/00—Cycles convertible to, or transformable into, other types of cycles or land vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K17/00—Cycles not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/02—Transmissions characterised by use of an endless chain, belt, or the like of unchangeable ratio

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Abstract

The present invention relates to a two-wheel driving bicycle comprising a pair of left and right rear wheels installed in one rear driving shaft in a tricycle or a four-wheel bicycle, controlling the rotation speed of left and right rear wheels appropriate for each radius of rotation when the wheels are rotated. Moreover, according to the present invention, a wheel driving body coupled to the rear driving shaft rotates a latchet driving body coupled to a hub of the rear wheel in one direction in order to provide a more simple and minimized new power transmission structure.

Description

CYCLE WITH TWO WHEEL DRIVING MECHANISM [0002]

The present invention relates to a two-wheel drive bicycle in which a bicycle is driven by two wheels positioned at the rear.

In general, the bicycle includes a support frame formed in a trapezoidal shape, a handle post pivotably fixed to the front upper portion of the support frame, a handle arranged substantially horizontally above the handle post, And a saddle fixed to a rear upper portion of the support frame. The crankshaft includes a pedal installed at a front lower portion of the support frame, and a crankshaft including a main sprocket. The crankshaft includes a front wheel, a rear wheel mounted on the rear lower portion of the support frame, And an inline type structure having a driven sprocket installed on a rear wheel and connecting the main sprocket and the driven sprocket with a chain so as to provide a driving force to the rear wheel, each having a front wheel and a rear wheel.

The driving structure of such a two-wheeled bicycle allows the main sprocket provided on the crank shaft to rotate together by rotating the crank shaft by applying a force to the pedal while the user is sitting on the saddle, Rotate the sprocket to allow the bike to move forward so that the forward torque acts on the rear wheel.

However, a two-wheeled bicycle is difficult to keep in the center, requires a minimum speed to maintain its center, and is not desirable for the elderly who have a physical burden, for example, There are many problems.

In order to solve such a problem of a general two-wheeled bicycle, a three-wheeled or four-wheeled bicycle which does not need a skillful sense of balance or a speed higher than a certain level is provided for keeping the support point to three or more, Unlike a two-wheeled bicycle, the bicycle can be operated more reliably and comfortably for the elderly.

The three-wheeled or four-wheeled bicycle according to the prior art can be largely divided into a three-wheeled bicycle of the all-wheel drive type, an adult three-wheeled bicycle of the rear-wheel drive system, or a four-wheeled bicycle.

That is, the infant bicycle includes a front wheel and a pair of rear wheels, and a crank shaft having a pedal is provided together with the front wheel so as to directly drive the front wheel. The adult three-wheeled bicycle or four-wheeled bicycle includes a crankshaft including one or a pair of front wheels and a pair of rear wheels, similar to a general two-wheeled bicycle, including a pedal and a sprocket, And a drive structure for connecting the main sprocket and the driven sprocket with a chain so as to be able to provide rotational force to the drive shaft.

However, the driving structure of the adult three-wheel bicycle or the four-wheeled bicycle according to the related art as described above may not cause a problem when the vehicle runs straight without turning directions, but it is necessary to rotate the vehicle in accordance with the curved road, There is a problem in that the pair of driving wheels is fixed directly to both ends of one driving shaft which is horizontally disposed, so that it is difficult to smoothly rotate the driving wheels.

That is, at the time of curve running or turning, the left and right drive wheels provided on the drive shaft rotate at different rotational radii on the plane, and therefore, the rotation speed of each of the drive wheels must be appropriately adjusted according to the respective radius of rotation, However, since there is no means such as a differential gear system that allows the rotational speeds of the left and right drive wheels to be individually adjusted appropriately according to the respective turning radius as in the case of a general rear wheel drive vehicle, There is a problem such that it can be easily overturned at the time of a sudden turn.

On the other hand, the present inventor has proposed Korean Registered Patent No. 10-0879236 entitled " Two-Wheel Drive Structure for Bicycle "(registered on January 1, 2009). The conventional art has a pair of right and left driving wheels mounted on one driving shaft and allows the rotational speeds of the left and right driving wheels to be adjusted appropriately according to the respective turning radii during rotation.

However, in the related art, the ratchet sprocket, which is provided on the outer side of the hub and is composed of the inner ring and the outer ring, receives power from the power transmission protrusions of the drive plate and receives and receives the one-way power between the inner ring and the outer ring of the latch sprocket Therefore, the overall structure is complicated, and the overall structure is enlarged due to the drive plate which must be formed larger than the diameter of the ratchet sprocket and the ratchet sprocket, and it is difficult to precisely arrange the power transmitting projections on the drive plate corresponding to the shape of the ratchet sprocket .

Korean Patent No. 10-0879236 "Two-wheel drive structure for bicycle" (registered on January 1, 2009)

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the problems of the related art as described above, and it is an object of the present invention to provide a two-wheel drive type bicycle which can be simplified and downsized, and can eliminate the use of relatively precise parts such as power transmission projections do.

In addition, the present invention provides a new structure in which the left and right rear wheels installed on one rear drive shaft of a tricycle or a four-wheeled bicycle, and the rotational speeds of the left and right rear wheels are appropriately adjusted according to the respective turning radii Of a two-wheel drive bicycle.

According to an aspect of the present invention, A crankshaft provided in front of the support frame and including a pedal and a sprocket; A rear drive shaft rotatably provided behind the support frame; A driven sprocket provided at a longitudinally central portion of the rear drive shaft and transmitted through the chain to the power of the sprocket; A pair of wheel drive bodies fixedly coupled to both longitudinal ends of the rear drive shaft and having ratchet pawls on an outer circumferential surface thereof; A pair of rear wheels that are rotatably supported at both ends in the longitudinal direction of the rear drive shaft and include a hub having a threaded portion for the hub; A ratchet driving body having a ratchet tooth formed on one side of the inner circumferential surface to receive ratchet teeth from the ratchet latch of the wheel driving body only and a ratchet screw engaging portion screwed to the hub screw on the other side of the inner circumferential surface; And a control unit.

The rear drive shaft may include a first diameter portion to which the driven sprocket is coupled and a second diameter portion that extends outward from both sides in the longitudinal direction of the first diameter portion and has a diameter smaller than that of the first diameter portion, A first bearing seating portion extending outwardly of the first male threaded portion and having a reduced diameter in a sticking manner, a first bearing seating portion extending outwardly of the first bearing seating portion, And a second male screw portion extending to the outside of the second diameter portion.

Wherein the wheel driving body includes an engaging body fixedly coupled to the rear driving shaft and an elastic wire elastically supporting the posture of the ratchet pawl; A plurality of latching latch receiving grooves are formed on an outer peripheral surface of the coupling body so as to be spaced apart from each other, and an elastic wire receiving groove is formed along an outer peripheral surface of the coupling body; The elastic wire receiving grooves being formed through the plurality of ratchet latch receiving grooves; The ratchet pawl is rotatably mounted in the ratchet pawl receiving groove; The resilient wire being mounted on the resilient wire receiving groove to resiliently support the posture of the ratchet pawl; Lt; / RTI >

In this case, a bearing supporting nut provided with a first bearing between the first bearing seat portion of the rear drive shaft and the hub and a second bearing seat portion is screwed to the second male thread portion of the rear drive shaft, And a second bearing is provided between the second bearing seating portion of the bearing support nut and the hub.

As described above, according to the present invention, the wheel drive body coupled to the rear drive shaft rotates the ratchet drive body coupled to the hub of the rear wheel in one direction, thereby providing a two-wheel drive bicycle having a new structure in which the power transmission structure is simplified and miniaturized .

As described above, the present invention has a pair of right and left rear wheels mounted on a rear drive shaft of a tricycle or a four-wheeled bicycle, and the rotational speed of the right and left rear wheels can be appropriately adjusted according to the respective turning radius.

1 is an exploded perspective view conceptually showing a driving structure of a two-wheel drive bicycle according to an embodiment of the present invention;
FIG. 2 is an exploded perspective view showing a main configuration for driving one rear wheel in FIG. 1,
3 is a cross-sectional view corresponding to FIG. 2,
FIG. 4 is an enlarged perspective view of a main assembly for driving one rear wheel in FIG. 1,
FIG. 5 is a cross-sectional view corresponding to FIG. 4,
6 is a perspective view of a wheel drive body,
FIG. 7 is an exploded perspective view of FIG. 6,
FIG. 8 is a perspective view of the ratchet pawl and partially cut ratchet pawl of FIG. 7;
FIG. 9 is a sectional view showing the relationship between the ratchet pawl and the elastic wire in FIG. 6;
Fig. 10 is a modification of Fig. 9 in which an external force is applied,
11 is a perspective view corresponding to Fig. 10,
12 is a sectional view for showing the ratchet teeth of the ratchet drive body,
13 is a cross-sectional view showing the relationship between the ratchet teeth of the ratchet drive body and the ratchet pawl.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

FIG. 1 is an exploded perspective view conceptually showing a driving structure of a two-wheel drive bicycle according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a main structure for driving one rear wheel in FIG. Fig. 3 is a cross-sectional view corresponding to Fig. 2, Fig. 4 is an enlarged perspective view of a major configuration for driving one rear wheel in Fig. 1, Fig. 5 is a cross- 6 is a perspective view of the wheel drive, FIG. 7 is an exploded perspective view of FIG. 6, FIG. 8 is a perspective view of the ratchet pawl and the partially cut ratchet pawl of FIG. 7, and FIG. 9 is a perspective view of the ratchet pawl and elastic wire 11 is a perspective view corresponding to Fig. 10, Fig. 12 is a sectional view for showing the ratchet teeth of the ratchet drive body, Fig. 13 is a cross-sectional view for showing the ratchet teeth of the ratchet drive body, Ratchet Sectional view showing the relationship between the ratchet teeth of the fuselage and the latch ratchet.

The two-wheel drive bicycle according to an embodiment of the present invention includes a pedal 111 and a crankshaft 110 (not shown) including a pedal 111 and a sprocket 112, And a rear drive shaft 210 rotatably provided behind the support frame (not shown) and provided with a driven sprocket 220 interlocked with the main sprocket 112 through a chain 120 do.

The driven sprocket (220) is provided at a longitudinally central portion of the rear drive shaft (210).

The rear drive shaft 210 includes a first diameter portion 211 formed at the center in the longitudinal direction and a second diameter portion 211 extending outward from both sides in the longitudinal direction of the first diameter portion 211 and having a smaller diameter than the first diameter portion 211 A first bearing seating portion 213 extending in the outer side of the first male screw portion 212 and having a reduced diameter in a sticking manner, a first bearing seating portion 213, A second diameter portion 214 extending outside the second diameter portion 214 and a second male thread portion 215 extending outward of the second diameter portion 214.

That is, the rear drive shaft 210 includes a first diameter portion 211, a pair of first male screw portions 212, a first bearing seat portion 213, a second diameter portion 214, and a second male threaded portion 215.

In addition, the driven sprocket 220 is coupled to the first diameter portion 211 of the rear drive shaft 210 using a key coupling or the like.

Meanwhile, the driven sprocket 220 installed on the rear drive shaft 210 may be two or more depending on the riding capacity, and the crank shaft 110 may be provided in correspondence thereto. The respective driven sprockets 220 are installed on the first diameter portion 211 of the rear drive shaft 210 at positions aligned with the respective main sprockets 112 included in the respective crankshafts 110, Each of which can receive power through the chain 120.

On the other hand, the first male screw portion 212 of the rear drive shaft 210 is provided with a wheel drive body 230 for driving the rear wheel 240 to rotate.

The wheel driving body 230 rotatably drives the rear wheel 240 in one direction by the ratchet coupling with the ratchet driving body 250 but does not rotate in the other direction.

The wheel drive body 230 includes an engaging body 231 screwed to the first male threaded portion 212 of the rear drive shaft 210 and a plurality of ratchet fasteners 232 and an elastic wire 233 .

The coupling body 231 has a female threaded portion 231a formed on its inner circumferential surface to be screwed to the first male threaded portion 212 of the rear drive shaft 210. [

In addition, a plurality of ratchet latch receiving grooves 231b and elastic wire receiving grooves 231c are formed on the outer circumferential surface of the coupling body 231.

The elastic wire receiving grooves 231c are formed along the outer peripheral surface of the engaging body 231 and pass through the plurality of ratchet latch receiving grooves 231b .

The ratchet pawl 232 is mounted on each ratchet latch receiving groove 231b and the elastic wire 233 is mounted on the elastic wire receiving groove 231c and the elastic wire 233 is pushed by the ratchet pawl 232 And is elastically supported.

More specifically, the ratchet pawl 232 includes a rotatable body 232a rotatably seated in the ratchet latch receiving groove 231b in the form of a curved surface, and a pair of inclined protrusions 239b protruding outwardly in an inclined manner from the seat body 232a 232b, and a wire insertion groove 232c is formed between the slanted projections 232b of one phase.

The elastic wire 233 is mounted on the elastic wire receiving groove 231c while passing through the wire insertion groove 232c of the ratchet pawl 232. [

7, a bent portion 233a is formed in one of the cut ends so that the bent portion 233a is formed on the outer peripheral surface of the coupling body 231 And is engaged with the elastic wire engagement groove 231d.

The relationship between the ratchet pawl 232 and the elastic wire 233 is such that the resilient wire 233 is stably mounted in the elastic wire receiving groove 231c, The slant projection 232b of the slider 232 is elastically supported so as to protrude from the outer circumferential surface of the engaging body 231. [

When the slant projection 232b of the ratchet pawl 232 is tilted by the external force toward the outer circumferential surface of the engaging body 231 (in other words, inwardly) (specifically, the ratchet drive body 250, as shown in Figs. 10 and 11) The resilient wire 233 applies an elastic force such that the posture of the ratchet pawl 232 is restored to the shape shown in Figs. 9 and 6.

Meanwhile, the ratchet driving body 250 is provided to transmit the rotational force of the wheel driving body 230 only in one direction.

The ratchet driving body 250 is screwed to the hub 241 of the rear wheel 240 and is fixed to the wheel driving body 230 only in one direction.

To this end, a ratchet tooth 251, which is ratchet-engaged with the ratchet pawl 232 of the wheel drive body 230, is formed on one side of the inner circumferential surface of the ratchet drive body 250, and a rear wheel A ratchet screw engagement portion 252 is formed which is screwed with the hub 241 of the ratchet coupling portion 240.

The relationship between the ratchet teeth 251 of the ratchet drive body 250 and the wheel drive body 230 can be seen from FIG.

The ratchet pawl 251 of the ratchet drive body 250 is inclined toward the counterclockwise direction and when the wheel drive body 230 rotates clockwise, the ratchet pawl 232 of the wheel drive body 230 rotates clockwise The rotational force of the wheel drive body 230 is not transmitted to the ratchet drive body 250. When the wheel drive body 230 rotates counterclockwise, the ratchet pawl 230 of the wheel drive body 230 232 are engaged with the ratchet teeth 251 so that the rotational force of the wheel drive body 230 is transmitted to the ratchet drive body 250.

The hub 241 of the rear wheel 240 is screwed to the ratchet screw engagement portion 252 of the ratchet drive body 250. To this end, a screw coupling portion 241a for hub is formed on the outer peripheral surface of one side of the hub 241 .

The first bearing 260 and the second bearing 270 are mounted on the rear drive shaft 210 so that the hub 241 of the rear wheel 240 can be rotatably supported on the rear drive shaft 210, A nut 280 and a fixing nut 290 are mounted.

The first bearing 260 and the second bearing 270 are all of the same shape and are inserted into the rear drive shaft 210 in opposite directions.

The first bearing 260 and the second bearing 270 are both of a very simple structure consisting of only a ball housing and a ball.

The first bearing 260 is provided between the first bearing seating portion 213 of the rear drive shaft 210 and the hub 241.

The bearing support nut 280 is screwed to the second male threaded portion 215 of the rear drive shaft 210 while the second bearing seating portion 281 is formed on the outer peripheral surface of the bearing support nut 280 .

The second bearing 270 is provided between the second bearing seat 281 of the bearing support nut 280 and the hub 241.

Since the first bearing 260 and the second bearing 270 have the same shape, the second bearing seating portion 281 is also formed in a shape corresponding to the first bearing seating portion 213.

The wheel drive body 220 is rotated together with the rear drive shaft 210 and the hub 241 of the rear wheel 240 is rotated by the first and second bearings 260 and 260. [ 270 to the rear drive shaft 210 in a rotatable manner.

In addition, the ratchet driving body 250, which is screwed to the hub 241, receives only one-way rotational force from the wheel driving body 220 and transmits the rotational force to the hub 241. In addition, the ratchet drive body 250 is a component separated from the wheel drive body 220 only by receiving only the unidirectional power from the wheel drive body 220.

Therefore, in this embodiment, the wheel driving body 220 coupled to the rear driving shaft 210 rotates the ratchet driving body 250 coupled to the hub 241 of the rear wheel 240 in one direction, Can be made simpler and smaller.

With this structure, the present embodiment has a pair of right and left rear wheels 240 installed on one rear drive shaft 210, and the rotational speeds of the right and left rear wheels 240 are changed according to the respective turning radii Can be adjusted appropriately.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the embodiments described above are intended to be illustrative, but not limiting, in all respects. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: crankshaft 111: pedal
112: Main sprocket 120: Chain
210: rear drive shaft 211: first diameter portion
212: first male screw portion 213: first bearing seat portion
214: second diameter portion 215: second male thread portion
220: Follower sprocket
230: wheel drive body 231: engaging body
232: ratchet pawl 233: elastic wire
240: rear wheel 241: hub
250: ratchet drive body 251: ratchet teeth
252: ratchet screw engagement portion
260: first bearing
270: Second bearing
280: Bearing support nut 281: Second bearing seating part
290: Fixing nut

Claims (4)

A support frame;
A crankshaft provided in front of the support frame and including a pedal and a sprocket;
A rear drive shaft rotatably provided behind the support frame;
A driven sprocket provided at a longitudinally central portion of the rear drive shaft and transmitted through the chain to the power of the sprocket;
A pair of wheel drive bodies fixedly coupled to both longitudinal ends of the rear drive shaft and having ratchet pawls on an outer circumferential surface thereof;
A pair of rear wheels that are rotatably supported at both ends in the longitudinal direction of the rear drive shaft and include a hub having a threaded portion for the hub;
A ratchet driving body having a ratchet tooth formed on one side of the inner circumferential surface to receive ratchet teeth from the ratchet latch of the wheel driving body only and a ratchet screw engaging portion screwed to the hub screw on the other side of the inner circumferential surface;
And a second-wheel-drive-type bicycle.
The method according to claim 1,
The rear drive shaft includes a first diameter portion to which the driven sprocket is coupled, a second diameter portion that extends outward from both sides in the longitudinal direction of the first diameter portion, and which has a diameter smaller than that of the first diameter portion, A first bearing seating portion extending outwardly of the first male thread portion and having a reduced diameter in a sticking manner; a second diameter portion extending outwardly of the first bearing seating portion; And a second male screw portion extending to the outside of the two-diameter portion.
3. The method according to claim 1 or 2,
The wheel driving body includes an engaging body fixedly coupled to the rear drive shaft, and an elastic wire elastically supporting the posture of the ratchet pawl;
A plurality of latching latch receiving grooves are formed on an outer peripheral surface of the coupling body so as to be spaced apart from each other, and an elastic wire receiving groove is formed along an outer peripheral surface of the coupling body;
The elastic wire receiving grooves being formed through the plurality of ratchet latch receiving grooves;
The ratchet pawl is rotatably mounted in the ratchet pawl receiving groove;
The resilient wire being mounted on the resilient wire receiving groove to resiliently support the posture of the ratchet pawl;
And a bicycle.
3. The method of claim 2,
Wherein a bearing support nut having a first bearing and a second bearing receiving portion is screwed to a second male threaded portion of the rear drive shaft, And a second bearing is provided between the second bearing seating portion of the second bearing and the hub.
KR1020140084966A 2014-07-08 2014-07-08 Cycle with two wheel driving mechanism KR20160005903A (en)

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KR1020140084966A KR20160005903A (en) 2014-07-08 2014-07-08 Cycle with two wheel driving mechanism

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Application Number Priority Date Filing Date Title
KR1020140084966A KR20160005903A (en) 2014-07-08 2014-07-08 Cycle with two wheel driving mechanism

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KR20160005903A true KR20160005903A (en) 2016-01-18

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100879236B1 (en) 2007-03-07 2009-01-20 김현옥 Two-wheel drive type driving mechanism for cycle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100879236B1 (en) 2007-03-07 2009-01-20 김현옥 Two-wheel drive type driving mechanism for cycle

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