KR20010006665A - Forward driving gear for bicycle - Google Patents

Abstract

The present invention relates to a forward drive converter for a bicycle, the configuration of which is a pedal shaft that can rotate with the pedal, the inner disk and the outer disk to support without interference when the pedal shaft rotates on the pedal shaft, and A housing installed on the pedal shaft and rotating in the same direction as the pedal bar rotates in a predetermined direction, a driving sprocket disposed on the outer circumference of the housing, and integrally formed with the driving sprocket and mounted on the inner disk. A forward driving wheel supported by and adjacent to an inner circumferential surface of the housing, a reverse driving wheel disposed adjacent to one side of the forward driving wheel and an inner circumferential surface of the housing and supported by the outer disk, and forward and reverse rotational force of the housing Bidirectional ratchets for selective delivery to wheels; It consists of a direction change relay gear for inducing a forward rotational force to the drive sprocket by switching the direction during the reverse rotation of the housing, and maintains the same speed ratio as the forward rotation of the pedal even when the pedal rotates in reverse direction and the bicycle moves forward. It has an effect that can be done.

Description

Forward driving gear for bicycle

The present invention relates to a forward drive converter for bicycles, and more particularly, to a forward drive converter for bicycles for transmitting power to maintain the same speed ratio as the forward rotation of the pedal even when the pedal is rotated forward. will be.

In general, the driving device of the bicycle is composed of a drive and driven sprockets installed on the pedal shaft and the rear wheel hub shaft, respectively, and a chain connecting them, and in a predetermined direction (bicycle forward direction, ie, forward direction) to the drive sprocket. A clutch mechanism is provided to rotate only when a rotational driving force of.

When the driver rotates the pedal in the forward direction, the bicycle driving device transmits the rotational driving force from the driving sprocket to the driven sprocket by the chain and rotates the hub shaft through the clutch mechanism, thereby driving forward as the rear wheel rotates. When the driver does not apply force to the pedal or rotates in the reverse direction, the clutch shaft is idled by blocking the clutch mechanism from being transmitted to the rear wheel, and the bicycle continues to move forward by inertia.

Therefore, the conventional bicycle drive device is capable of forward driving only by forward rotation of the pedal, so that not only the driving operation of the pedal is monotonous, but also the thigh muscle fatigue caused by the one-way operation of the pedal has been accumulated in the body during long driving. In order to alleviate muscle fatigue, there is a problem that the motorist loses the inertia force of the bicycle while the pedal shaft is idling while resting with the foot on the pedal or when the pedal is in reverse rotation. .

In recent years, in order to improve the problems of the conventional driving bicycle as described above, practical developments have been made on various forward driving converters capable of driving the bicycle forward even when the pedal is reversed.

The forward drive converter for bicycles currently being developed and put into practical use includes a drive driving unit for transmitting a driving force of a pedal shaft inserted into the boss of the frame to the driving sprocket, and a pedal that is detachably fastened to the driving driving unit. The switching drive unit for converting the reverse rotation and the idle rotation of the shaft to the forward rotation to be transmitted to the drive sprocket, and the switching lever unit to be attached to and detached from the driving driving unit in accordance with the driving operation of the driver.

In the conventional forward drive converting apparatus having such a configuration, when the driver operates the lever of the switching lever unit while driving the bicycle, the switching driving unit is coupled to the driving driving unit so that the rotational direction of the pedal is reversed by the switching driving unit during the reverse rotation of the pedal. As it is transmitted to the driving driving portion, the forward driving is possible even in the reverse driving of the pedal.

However, in the forward drive converter as described above, the driver must operate the lever of the shift lever so that the shift drive unit is coupled to the drive driving unit when the forward drive is driven by the reverse rotation of the pedal while the bicycle is being driven, and the forward drive of the pedal forward When the driver wants to return to the driving state or the driver tow-moves the bicycle, the switch has to be operated again so that the switching drive is disengaged from the driving driving part, thereby causing inconvenience in driving the bicycle.

In addition, the forward drive converter has a structure in which the rotation ratio is decelerated during the transmission of the rotational driving force of the pedal to the driving driving unit through the change driving unit, so that the driving speed cannot be maintained at the same speed as the forward driving of the pedal. In addition to the loss of power and efficiency, as well as the conversion drive and the switching lever portion has a very complex structure consisting of a plurality of parts, there was a problem that the productivity and the increase in manufacturing costs due to the increase in the assembly process.

The present invention has been made to solve all the problems of the conventional forward drive converter as described above, the main purpose of the combined state of the inside of the driver only by the pedal operation to apply the driving force in the forward or reverse direction without a separate lever operation It is to provide a forward drive conversion device for the bicycle that can promote the convenience of driving by enabling the forward drive while the automatic conversion.

Another object of the present invention is to reduce the load generated by the friction between the coupling parts even when driving forward by the reverse rotation operation of the pedal, it is possible to transfer the driving force at the same rotation ratio as in the forward rotation, there is no power loss and high efficiency bicycle To provide a forward drive inverter.

Still another object of the present invention is to configure the structure of the forward drive conversion of the bicycle as a single assembly to be detachable to the hub shaft of the pedal shaft or the rear wheel to facilitate the repair and replacement of the trouble of the forward drive conversion device for easy maintenance In providing.

Another object of the present invention to achieve a simple structure using a small number of parts can be expected to improve the productivity by reducing the bicycle assembly process, to provide a forward drive conversion device for a bicycle that can reduce the production cost.

Still another object of the present invention is to provide a forward drive converter for a bicycle, by which the rear wheel is freely rotated, thereby facilitating the traction movement of the bicycle.

1 is a partially exploded perspective view showing a coupling structure of a bicycle forward drive converter according to a first embodiment of the present invention.

2 is a cross-sectional view of the combination of the forward drive conversion apparatus for bicycles according to the first embodiment of the present invention.

3 is a perspective view showing the structure of the bidirectional ratchet applied to the forward drive converter according to the first embodiment of the present invention.

Figures 4a and 4b is an operating state diagram showing the locking state of the bidirectional ratchet applied to the forward drive conversion apparatus according to the first embodiment of the present invention when the pedal is rotated in any direction,

Figure 4a is a state in which the bidirectional ratchet is caught in the forward ratchet gear by the elasticity of the compression spring when the pedal is operated in the forward direction (right screw fastening direction),

Fig. 4B shows that the bidirectional ratchet overcomes the elasticity of the compression spring and is caught in the reverse ratchet gear when the pedal is operated in the reverse direction (right screw release direction).

5A and 5B are operating state diagrams schematically showing a forward drive mechanism of the forward drive converting apparatus according to the first embodiment of the present invention when the pedal is rotated in any direction;

Figure 5a is a power transmission state according to the bidirectional ratchet latching state of Figure 4a when the pedal is operated in the forward direction,

Figure 5b is a power transmission state according to the bi-directional ratchet latch state of Figure 4b when the pedal is operated in the reverse direction.

6 is a perspective view showing the structure of a bidirectional ratchet according to a second embodiment of the present invention.

7A and 7B are operating state diagrams showing a locking state of the bidirectional ratchet according to the second embodiment of the present invention when the pedal is rotated in any direction;

7A shows a state in which the bidirectional ratchet is caught in the forward ratchet gear by forward pressurization from the locking groove when the pedal is operated in the forward direction;

Fig. 7B shows a state where the bidirectional ratchet is caught by the reverse ratchet gear by reverse pressure from the locking groove when the pedal is operated in the reverse direction.

8 is an exploded perspective view of a partially cut away showing the coupling structure of the forward drive conversion apparatus for bicycles according to the third embodiment of the present invention.

9 is a cross-sectional view of the combination of the bicycle forward drive conversion apparatus according to the third embodiment of the present invention.

10 is a perspective view showing the structure of the bidirectional ratchet applied to the forward drive converter according to the third embodiment of the present invention.

11A and 11B are operating state diagrams showing the engaged state of the bidirectional ratchet applied to the forward drive converting apparatus according to the third embodiment of the present invention when the pedal is rotated in any direction;

11A shows a state in which the bidirectional ratchet is caught in the forward ratchet gear by the elasticity of the compression spring when the pedal is operated in the forward direction;

Fig. 11B shows that the bidirectional ratchet is caught in the reverse ratchet gear by the elasticity of the compression spring when the pedal is operated in the reverse direction.

12A and 12B are operating state diagrams schematically showing a forward drive mechanism of the forward drive converting apparatus according to the third embodiment of the present invention when the pedal is rotated in any direction;

Figure 12a is a power transmission state according to the bidirectional ratchet latch state of Figure 11a when the pedal is operated in the forward direction,

12B is a power transmission state in accordance with the bidirectional ratchet locking state in FIG. 11B when the pedal is operated in the reverse direction.

FIG. 13 is an exploded perspective view of a partially cutaway view showing a coupling structure of a bicycle forward drive converter according to a fourth embodiment of the present invention; FIG.

14 is a cross-sectional view of a combination of the bicycle forward drive conversion apparatus according to the fourth embodiment of the present invention.

15A and 15B are operating state diagrams showing the engaged state of the bidirectional ratchet applied to the forward drive converting apparatus according to the fourth embodiment of the present invention when the pedal is rotated in any direction;

Fig. 15A shows a state in which the bidirectional ratchet is engaged with a forward ratchet gear disposed outside thereof at an inner position adjacent to the pedal shaft when the pedal is operated in the forward direction,

Fig. 15B shows a state in which the bidirectional ratchet is engaged with the reverse ratchet gear disposed outside the pedal when the pedal is operated in the reverse direction.

16A and 16B are operating state diagrams schematically showing a forward drive mechanism of the forward drive converting apparatus according to the fourth embodiment of the present invention when the pedal is rotated in any direction;

Figure 16a is a power transmission state according to the bidirectional ratchet latching state of Figure 15a when the pedal is operated in the forward direction,

Fig. 16B is a power transmission state in accordance with the bidirectional ratchet latching state of Fig. 15B when the pedal is operated in the reverse direction.

※ Explanation of codes for main parts of drawing

One ; Frame 2; boss

3; Bearing bushing 4; Pedal Bar

5, 300; Pedal shaft 6; Pedal Bar Fixing Nuts

7; Rear wheel frame 8; Fixed shaft

9; Hub shafts 10, 110 and 210; Inner disk

11; Pedal Shaft Insert

12, 22, 112, 122, 212, 222; Gear shaft fixing

13, 113; Bearing ball 14; Ball bearing

15, 115; Ball contact surfaces 20, 120; Outer disk

30, 230; Housing 31; Housing body

32; Pedal bar bumps 33, 141, 311; Ratchet mounting groove

33a, 312; Locking groove 40, 240; Drive sprocket

50, 150, 250; Forward drive wheels 51, 151, 252; Forward Ratchet Gears

52, 62, 152, 162; Inner peripheral surface side gears 53 and 153; Ball contact groove

60, 160, 260; Reverse drive wheels 61, 161, 262; Reverse ratchet gear

70, 170, 270; Bidirectional ratchet 71, 171, 271; Ratchet body

72, 172, 272; End 73, 173; Axis of rotation

74, 174; Spring seats 75, 175; Compression Spring

80, 180, 280; Turning gears 81, 181; Internal gear

82, 182, 282; Gear shafts 83, 183, 283; Interlocking gear

111; Fixed shaft insertion hole 123; Holder seating protrusion

124; Frame holder 125; Frame Support Bar

126; Frame jammer 140; Driven sprocket

154; Inner space portion 155; Hub Shaft Connection

156; Hub shaft fasteners 251, 261; Outer peripheral side gear

273; Axis of rotation 274; bend

275; Support ring 276; Push pin

281; External gear 310; Great Gyeongbu

The bicycle forward drive conversion apparatus according to the present invention for achieving the above object is inserted so as to be rotatable within the boss of the frame and the pedal bar is fixed to both ends protruding to both sides of the boss to rotate together with the pedal. A pedal shaft configured to be spaced apart from each other at predetermined intervals on the pedal shaft to support an inner disk and an outer disk to prevent interference when the pedal shaft is rotated, and a cylindrical drum surrounding the outer circumference of the inner disk and the outer disk. A housing formed on the pedal shaft and configured to rotate in the same direction when the pedal bar rotates in a predetermined direction, a drive sprocket disposed adjacent to an outer circumference of the housing, and rotation of the housing Drive soup so as not to interfere with drive A ring-shaped forward drive wheel integrally formed with the kit and supported by the inner disk in contact with the inner circumferential surface of the housing, disposed adjacent to one side of the forward drive wheel and the inner circumferential surface of the housing, and in contact with the outer disk. A ring-shaped reverse drive wheel supported on the inner circumferential surface of the housing, a bidirectional ratchet for selectively transmitting a rotational force in a predetermined direction of the housing to the forward and reverse drive wheels, and together with the reverse rotation of the housing. It is characterized in that it consists of a direction switching relay gear for inducing a forward rotational force to the drive sprocket by converting the rotational direction of the rotating reverse drive wheel in the forward direction to the forward drive wheel.

In addition, the bicycle forward drive conversion apparatus according to the present invention for achieving the above object is installed so as to be rotatable on a fixed shaft to which the rear frame is fixed, the hub shaft for fixing the rim reinforcement of the rear wheel, and the fixed An inner disk and an outer disk fixedly spaced apart by a predetermined interval on the shaft, a forward driving wheel supported by the inner disk in rolling contact and screwed with the hub shaft, and a tip of which forms a ring shape, and one side of the forward driving wheel; And a ring-shaped reverse drive wheel supported in rolling contact with the outer disk, and surrounding the outer circumferences of the forward drive wheel and the reverse drive wheel, and are connected in chains with a drive sprocket of a pedal shaft from the drive sprocket. Dependent rotation in the same direction by the transmitted torque A driven sprocket, a bidirectional ratchet which is accommodated on an inner circumferential surface of the driven sprocket and selectively transmits a rotational force of the driven sprocket to a predetermined and reverse driving wheel; It is characterized by consisting of a direction change relay for inducing a forward rotational force on the hub shaft by transferring the direction of rotation of the reverse drive wheel to rotate in the forward direction to the forward drive wheel in the reverse rotation.

In addition, the forward drive conversion device for a bicycle according to the present invention for achieving the above object is inserted so as to be rotatable in the boss of the frame and the pedal bar is fixed to each of the both ends protruding to both sides of the boss with a pedal A pedal shaft having a ratchet mounting groove of a predetermined shape formed on the outer circumference of the large diameter portion which rotates and enlarges the diameter of a partial region, and an inner disk which is spaced apart at a predetermined interval from the pedal shaft to support the interference of the pedal shaft when rotation occurs. And a housing provided on the pedal shaft in the form of an outer disk, a cylindrical drum surrounding the outer circumference of the inner disk and the outer disk, a drive sprocket integrally formed along the outer circumference of the housing, and the pedal of the housing. Integrally around the inside of the shaft insertion hole And a forward driving wheel formed to receive the large diameter portion of the pedal shaft and having an outer circumferential side gear formed around the outer circumferential surface thereof, and having a forward ratchet gear having a predetermined direction along the inner circumferential surface thereof, and the forward driving wheel on the large diameter portion of the pedal shaft. A reverse driving wheel formed adjacent to the outer circumferential surface and formed with an outer circumferential side gear along the inner circumferential surface and having a reverse ratchet gear having a reverse direction with respect to the forward ratchet gear along the inner circumferential surface thereof; The bidirectional ratchet for selectively transmitting the rotational force of the pedal shaft in a predetermined direction to the forward and reverse driving wheels, and the rotational direction of the reverse driving wheel that rotates together with the forward rotation of the pedal shaft in the forward direction to the forward direction. It is characterized by consisting of a directional relay gear for inducing a forward rotational force to the drive sprocket by transmitting to the directional drive wheel.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The forward drive converter for a bicycle according to the present invention can be mounted on a pedal shaft or a rear wheel hub shaft by structural deformation according to an installation environment, and each embodiment will be described in detail.

First, Figures 1 to 7b show a first embodiment and a second embodiment when the forward drive converter according to the present invention is mounted on the pedal shaft 5, Figures 1 and 2 show Partial cutaway exploded perspective view and coupling cross-sectional view showing a coupling structure of the bicycle forward drive conversion apparatus according to a preferred embodiment, Figure 3 is a perspective view showing the structure of the bidirectional ratchet 70 applied to the embodiment of the present invention, Figure 4A and 4B are operation state diagrams showing the locked state of the bidirectional ratchet 70 when the pedal is rotated in an arbitrary direction, and FIG. 4A is a bidirectional ratchet ( 70) is caught by the forward ratchet gear 51 by the elasticity of the compression spring 75, Figure 4b is the bidirectional direction when the pedal is operated in the reverse direction (right screw release direction) The tooth 70 overcomes the elasticity of the compression spring 75 and is shown in the reverse ratchet gear 61, respectively. FIGS. 5A and 5B show the forward drive mechanism of the embodiment when the pedal is rotated in any direction. 5A is a power transmission state according to the locking state of the bidirectional ratchet 70 of FIG. 4A when the pedal is operated in a forward direction, and FIG. 5B is a bidirectional direction of FIG. 4B when the pedal is operated in a reverse direction. Figure 6 shows the power transmission state according to the latching state of the ratchet 70, Figure 6 shows the structure of the bidirectional ratchet according to the second embodiment of the present invention, Figures 7a and 7b the pedal rotates in any direction 7A is an operation state diagram showing a locking state of the bidirectional ratchet 270 according to the second embodiment of the present invention when the pedal is operated in the forward direction. If the bidirectional ratchet 270 is caught in the forward ratchet gear 51 by the forward pressure from the locking groove (33a), Figure 7b is the bidirectional ratchet (270) is the locking groove ( The state caught by the reverse ratchet gear 61 by the reverse pressurization from 33a) is shown, respectively.

As shown in the figure, the forward drive converter for bicycle according to an embodiment of the present invention in the boss (2) of the bicycle frame (1) in order to transmit the driving force to the rear wheel of the bicycle via a chain A pedal shaft 5 which is inserted to be rotatable in the pedal bar 4 and is fixed to the both ends of the bosses 2 protruding to both sides of the boss 2 and integrally fixed to the pedal bar 4, respectively, An inner disk 10 disposed on the pedal shaft 5 at a predetermined interval and supporting the rotation of the pedal shaft 5 without interfering with a bearing bush 3 and a ball bearing 14 therebetween. And an outer disk 20 and a cylindrical drum surrounding the outer circumferences of the inner disk 10 and the outer disk 20 and installed on the pedal shaft 5 to provide the outer disk 20. A housing 30 configured to be rotated in the same direction when the Dal bar 4 rotates in a predetermined direction, a multi-stage drive sprocket 40 disposed adjacent to an outer circumference of the housing 30, It is formed integrally with the drive sprocket 40 so as not to interfere with the rotational driving of the housing 30, the rolling drive is supported on the inner disk 10, the ring-shaped forward drive adjacent to the inner peripheral surface of the housing 30 A wheel 50, a ring-shaped reverse drive wheel 60 disposed adjacent to one side of the forward drive wheel 50 and an inner circumferential surface of the housing 30 and supported in rolling contact with the outer disk 20; It is received on the inner peripheral surface of the housing 30, the bidirectional ratchet 70 for selectively transmitting the rotational force in the predetermined direction of the housing 30 to the forward and reverse drive wheels 50, 60, and the housing 30 Reverse rotation Directional relay gear 80 for inducing a forward rotational force to the drive sprocket 40 by transferring the direction of rotation of the reverse drive wheel 60 rotates in the forward direction and forward to the forward drive wheel 50 Consists of

The housing 30 forms a pedal bar locking protrusion 32 protruding to a predetermined height so that the pedal bar 4 rotates on the outer side of the housing body 31 on the disc, and an inner circumferential surface of the housing 30. One side is to form a ratchet installation groove 33 that can accommodate the bidirectional ratchet (70).

The drive sprocket 40 preferably stacks a plurality of drive sprockets 40 having different diameters so as to allow a multi-stage shift for adjusting a rotation ratio during a bicycle driving.

In addition, a forward ratchet gear 51 and a reverse ratchet gear 61 are formed on the outer circumferential surfaces of the forward drive wheel 50 and the reverse drive wheel 60, respectively, and each of the inner circumferential surfaces has the direction change. The inner peripheral surface side gears 52 and 62 which are tooth-coupled with the relay gear 80 are formed.

In addition, the bidirectional ratchet 70 is to be caught in the teeth of the forward ratchet gear 51 and the reverse ratchet gear 61, the wedge-shaped locking in the vertical direction of both sides of the ratchet body 71 having a predetermined length. End portion 72 is formed to form a bent shape, any one of the locking end portion 72 is elastically supported from the ratchet mounting groove 33 by the compression spring 75, the length of the ratchet body 71 In the lateral side end, a rotation shaft surface 73 is formed to be rotatable within the inner circumferential surface of the housing 30.

In addition, the direction change relay gear 80 is rotatably fixed between the gear shaft fixing holes 12, 22 of the inner and outer disks 10 and 20, and on the inner peripheral surface of the reverse drive wheel 60. The forward drive wheel is rotatably fixed between the internal gear 81 that is tooth-coupled with the formed inner circumferential surface side gear 62 and the gear shaft fixing holes 12 and 22 of the inner and outer disks 10 and 20. An inner circumferential surface-side gear 52 formed on the inner circumferential surface of 50 and an interlocking gear 83 that are tooth-coupled to the internal gear 81. At this time, the direction change relay gear 80 is preferably provided in a plurality of positions symmetrical with respect to the pedal shaft (5).

Although not specifically shown in the drawings in this embodiment, a plurality of support rods at positions where rotation interference of the forward and reverse driving wheels 50 and 60 does not occur between the inner disk 10 and the outer disk 20. Can be arranged to be firmly connected to each other.

In addition, each of the adjacent portion of the inner disk 10, the forward driving wheel 50, the reverse driving wheel 60 and the outer disk 20, a plurality of bearing balls so as to contact the rolling without interfering with each other during each rotation 13 is interposed at a predetermined interval, the bearing ball 13 performs a function that can minimize friction and power loss.

In the drawings, reference numeral 11 is a pedal shaft insertion hole, 15 and 53 are ball contact surface and ball contact groove for seating the bearing ball 13, 74 is a spring seat for seating the compression spring 75, 82 is inscribed And a gear shaft penetratingly coupled to the center of the interlocking gears 81 and 83.

On the other hand, in the present invention, it is possible to apply the bidirectional latch 270 as shown in Figures 6 to 7b, in this embodiment one side of the ratchet body 271 without using a separate compression spring (75). The curved portion 274 is formed in the structure, and the engaging groove 33a is formed on the inner circumferential surface of the housing 31 which is in contact with each other. The curved portion 274 is formed in accordance with the rotational direction of the housing 31. One of the edges is selectively pressed, so that either end portion 272 is selectively engaged with the forward ratchet gear 51 or the reverse ratchet gear 61.

Referring to the operation of the converter according to the present embodiment having the configuration as described above is as follows.

First, when the pedal shaft 5 rotates in the forward direction, as shown in FIGS. 4A and 5A, the pedal bar 4 pushes the pedal bar locking protrusion 32 of the housing 30 in the right screw tightening direction. The housing 30 is driven in the forward direction, and the latching end 72 of the bidirectional ratchet 70 engaged with the forward ratchet gear 51 is elastically supported in the ratchet installation groove 33 of the housing 30. Since the state is maintained, the tooth coupling is made between them to rotate the forward driving wheel 60 in the forward direction, and eventually the driving sprocket 40 integrally connected with the forward driving wheel 60 also rotates in the forward direction. Drive forward. At this time, the rotational force is also transmitted to the reverse driving wheel 60 through the interlocking gear 83 and the internal gear 81, but the reverse ratchet gear 61 is not tooth-connected with the bidirectional ratchet 70, and thus the reverse driving wheel. 60 is idle.

Next, when the pedal shaft 5 rotates in the reverse direction, as shown in FIGS. 4B and 5B, the pedal bar 4 moves the pedal bar locking projection 32 of the housing 30 in the right-hand release direction. The housing 30 is driven in the reverse direction, and the latching end 72 of the bidirectional ratchet 70 engaged with the forward ratchet gear 51 in the ratchet installation groove 33 of the housing 30 is At the same time as the departure from the inclined surface of the forward ratchet gear 51, the opposite end portion 72 is tooth-coupled with the reverse ratchet gear 61 of the reverse drive wheel (60). At this time, the bidirectional ratchet 70 has both latching end portions 72 by the ratchet body 71 as the rotating shaft by the action of the rotating shaft surface 73 contacting therein along the curved surface of the ratchet installation groove 33. When the tooth coupling is made between them, the reverse driving wheel 60 is rotated in the reverse direction, and the internal gear 81 engaged with the internal gear 81 is continuously toothed when the internal gear 81 engaged therewith is rotated at the same time. The interlocking gear 83 is rotated in the forward direction, and thus, the forward driving wheel 50 and the driving sprocket 40 which rotate in engagement with the interlocking gear 83 also rotate forward and drive the bicycle forward.

Accordingly, when the pedal of the bicycle is rotated forward and backward, it is possible to automatically convert the driving forward at all times even without complicated lever operation as in the prior art.

In addition, the operation principle of the bidirectional ratchet gear 270 according to the second embodiment of the above may be only a structural difference of which one of the locking end portion 272 to protrude from the ratchet mounting groove 33 of the housing 31. However, since the optional operating state is the same, a detailed description thereof will be omitted.

8 to 12B show an embodiment in which the forward drive converter according to the present invention is mounted on the rear wheel hub shaft 9, and FIGS. 8 and 9 show the embodiment according to the third embodiment of the present invention. Partial cutaway exploded perspective view and coupling cross-sectional view showing a coupling structure of the bicycle forward drive converter, Figure 10 is a perspective view showing the structure of the bidirectional ratchet 170 applied to the embodiment, Figure 11a and Figure 11b is a pedal FIG. 11A is a diagram illustrating an operation state of the bidirectional ratchet 170 when rotated in an arbitrary direction. FIG. 11A illustrates that the bidirectional ratchet 170 is moved forward by the elasticity of the compression spring 175 when the pedal is operated in the forward direction. 11B shows that the bidirectional ratchet 170 is reversed by the elasticity of the compression spring 175 when the pedal is operated in the reverse direction. 12A and 12B are diagrams showing an operating state schematically showing the forward drive mechanism of the present embodiment when the pedal is rotated in an arbitrary direction, and FIG. 12A shows that the pedal is operated in the forward direction. In the case of the power transmission state according to the latching state of the bidirectional ratchet 170 of FIG. 11A, FIG. 12B illustrates the power transmission state of the locking state of the bidirectional ratchet 170 of FIG. 11B when the pedal is operated in the reverse direction.

As shown in the figure, the forward drive conversion device for a bicycle according to another embodiment of the present invention is installed to be rotatable on a fixed shaft (8) to which the rear wheel side frame (7) is fixed to the reinforcement of the rear wheel The hub shaft 9 for fixing and the inner disk 110 and the outer disk 120 spaced apart by a predetermined interval on the fixed shaft 8 and the cloud contact is supported by the inner disk 110 and the Forward driving wheel 150 is screwed with the hub shaft 9 and its tip portion is ring-shaped, the reverse drive of the ring shape that is supported in rolling contact with one side of the forward drive wheel 150 and the outer disk 120 The wheel 160 and the forward driving wheel 150 and the reverse driving wheel 160 forms the shape surrounding the outer circumference and is connected to the drive sprocket 40 of the pedal shaft 5 in a chain Kit (40) Followed by the rotating force transmitted from the driven sprocket 140 in the same direction, and is accommodated on the inner circumferential surface of the driven sprocket 140 is rotated in a predetermined direction of the driven sprocket 140 Bidirectional ratchet 170 for selectively transmitting to the forward and reverse driving wheels 150 and 160 and the direction of rotation of the reverse driving wheel 160 to rotate with the driven sprocket 140 in the reverse rotation. It is composed of a direction change relay gear 180 for inducing a forward rotational force on the hub shaft (9) by switching in the forward direction to the forward drive wheel 150.

The outer disk 120 has a frame holder 124 for fixing the rear wheel side frame (7) outside the fixed shaft insertion hole 111 of the center of the outer disk 120 and the outer disk 120 and The rear wheel side frame 7 can be integrally coupled. That is, the outer disk 120 has a holder seating projection 123 for fixing the frame holder 124 around the upper and lower sides of the fixed shaft insertion hole 111, the frame holder 124 The fixed shaft insertion hole 111 is formed in the body portion, and one side of the frame support bar 125 is formed in parallel to maintain a predetermined interval, and the front end of the frame support bar 125 is The frame locking protrusion 126 protrudes so that the rear wheel side frame 7 may be caught.

In addition, the driven sprocket 140 is preferably laminated with a plurality of driven sprockets 140 having a different diameter so as to enable a multi-stage shift for adjusting the rotation ratio while driving the bicycle, the driven sprocket 140 At one side of the inner circumferential surface thereof, a ratchet installation groove 141 is formed to accommodate the bidirectional ratchet 170.

In addition, a forward ratchet gear 151 and a reverse ratchet gear 161 are formed on the outer circumferential surfaces of the forward drive wheel 150 and the reverse drive wheel 160, respectively, and the direction change is formed on each inner circumferential surface thereof. The inner peripheral surface side gears 152 and 162 which are tooth-coupled with the relay gear 180 are formed.

In addition, the bidirectional ratchet 170 is to be caught in the teeth of the forward ratchet gear 151 and the reverse ratchet gear 161, the wedge-shaped locking in the vertical direction of both sides of the ratchet body 171 having a predetermined length. End portion 172 is formed to form a bent shape, the center portion of the ratchet body 171 is elastically supported by the compression spring 175 so that both the locking end portion 172 can be pressed toward the hub shaft (9) On the longitudinal side end of the ratchet body 171, the rotating shaft surface 173 is formed to be rotatable within the inner circumferential surface of the driven sprocket 140.

In addition, the direction change relay gear 180 is rotatably fixed between the gear shaft fixing holes 112 and 122 of the inner and outer disks 110 and 120, and on the inner circumferential surface of the reverse drive wheel 160. The internal gear 162 is tooth-coupled with the formed inner peripheral surface side 162 and the gear shaft fixing holes 112, 122 of the inner and outer disk 110, 120 is rotatably fixed and the forward drive wheel An inner circumferential surface side gear 152 formed on the inner circumferential surface of 150 and an interlocking gear 183 toothed to the internal gear 181 are formed. In this case, it is preferable that the plurality of direction change relay gears 180 are provided at positions symmetrical about the fixed shaft 8.

Although not specifically illustrated in the drawings, in the present embodiment, the plurality of supporting rods are positioned between the inner disk 110 and the outer disk 120 at positions where rotation interference of the forward and reverse driving wheels 150 and 160 does not occur. Can be arranged to be firmly connected to each other.

In addition, a plurality of bearing balls can be contacted to each adjacent portion of the inner disk 110, the forward driving wheel 150, the reverse driving wheel 160 and the outer disk 120 without interfering with each other during each rotation. 113 is interposed at a predetermined interval, the bearing ball 113 performs a function that can minimize friction and power loss.

In the drawings, reference numerals 115 and 153 denote ball contact surfaces and ball contact grooves for seating the bearing balls 113, 154 denote inner space portions for accommodating the inner disk 110, and 155 denote the forward driving wheel 150. Hub shaft connecting portion formed on one side of the, 156 is a hub shaft fastening hole formed in the hub shaft connecting portion 155, 174 is a spring seat for seating the compression spring 75, 182 is the internal and interlocking gear 181 (183) The gear shaft is penetrated to the center of the figure.

In the above third embodiment, of course, the bidirectional ratchet 270 shown in the second embodiment can be applied.

Referring to the operation of the converter according to the present embodiment having the configuration as described above is as follows.

First, when the driven sprocket 140 rotates in the forward direction, as shown in FIGS. 11A and 12A, the ratchet mounting groove 151 in the ratchet installation groove 141 of the driven sprocket 140 is rotated. Since the center portion of the ratchet body 171 of the bidirectional ratchet 170 engaged with the resilient support state is maintained, the rotation end side locking end portion 172 of the bidirectional ratchet 170 is caught by the teeth of the forward ratchet gear 151. The forward drive wheel 60 is rotated in the direction of fastening the right screw, and as a result, the bicycle is moved forward by rotating the rear wheel while the hub shaft 9 screwed with the forward drive wheel 60 also rotates in the forward direction. At this time, the rotational force is also transmitted to the reverse driving wheel 160 through the interlocking gear 183 and the internal gear 181, but since the reverse ratchet gear 161 is not tooth-connected with the bidirectional ratchet 170, the reverse driving wheel. 160 is idle.

Next, when the driven sprocket 140 rotates in the reverse direction, as shown in FIGS. 11B and 12B, the reverse ratchet gear in the ratchet mounting groove 141 of the driven sprocket 140 is rotated. Since the center portion of the ratchet body 171 of the bidirectional ratchet 170 engaged with the 161 remains elastically supported, the rotation end side locking end portion 172 of the bidirectional ratchet 170 has the reverse ratchet gear 161. The reverse driving wheel 150 is rotated in the right-handed loosening direction while being caught by the tooth, and the locking end 172 is tooth-coupled with the reverse ratchet gear 161 of the reverse driving wheel 160. At this time, the bidirectional ratchet 170 has both latching ends 172 by the ratchet body 171 as the rotating shaft by the action of the rotating shaft surface 173 in contact therein along the curved surface of the ratchet installation groove 141. When the tooth coupling is made between them, the reverse driving wheel 160 is rotated in the reverse direction, and the internal gear 181 meshed with the internal gear 181 is continuously toothed when the internal gear 181 engaged therewith is reversed. The interlocking gear 183 rotates in a forward direction, and eventually drives the bicycle forward while rotating the forward driving wheel 150 and the hub shaft 9 and the rear wheel which are engaged with the interlocking gear 183.

As such, the power transmission path of the forward drive converter according to the present embodiment mounted on the hub shaft 9 includes a pedal, a driving sprocket 40, a chain, a driven sprocket 140, a bidirectional ratchet 170, The reverse driving wheel 160, the internal gear 181 and the interlocking gear 183, the forward driving wheel 150, the hub shaft 9, proceeds in the order of the rear wheel.

Accordingly, when the driven sprocket 140 of the bicycle is rotated forward and backward, it is possible to automatically convert the driving forward at all times even without complicated lever manipulation as in the prior art.

In addition to the embodiments as described above, the present invention can be simplified as a structure for installing a bidirectional ratchet on the pedal shaft, which is as shown in Figures 13 to 16b.

13 and 14 show partial cutaway exploded perspective views and coupling cross-sectional views respectively showing a coupling structure of a bicycle forward drive converter according to a fourth embodiment of the present invention, and FIGS. 15A and 15B show a pedal in an arbitrary direction. Fig. 15A is an operating state diagram showing the locked state of the bidirectional ratchet 270 applied to the forward drive converting apparatus according to the fourth embodiment of the present invention when rotated to FIG. 15A, when the pedal is operated in the forward direction. In a state in which the ratchet gear 252 is disposed at the outer side at the inner position adjacent to the pedal shaft 300, and FIG. 15B is a reverse ratchet in which the bidirectional ratchet 270 is disposed at the outer side when the pedal is operated in the reverse direction. Figures 16A and 16B show the state in which the gear 262 is engaged with each other. FIG. 16A is a diagram illustrating an operation of a forward drive mechanism of a forward drive converter according to an example. FIG. 16A illustrates a power transmission state according to a state of engagement of the bidirectional ratchet 270 of FIG. 15A when the pedal is operated in a forward direction. When the pedal is operated in the reverse direction, the power transmission states according to the latching state of the bidirectional ratchet 270 of FIG. 15B are respectively shown.

As shown in the figure, the forward drive conversion device for bicycle according to the fourth embodiment of the present invention, is inserted to be rotatable in the boss (2) of the frame (1) and protrudes to both sides of the boss (2) Pedal shaft 300 having a predetermined ratchet mounting groove 311 is formed in the outer circumference of the large diameter portion 310 to rotate the pedal bar 4 is integrally fixed to both ends of each of the two ends to extend the diameter of the partial region. ), An inner disk 210 and an outer disk 220 disposed to be spaced apart at predetermined intervals on the pedal shaft 300 so as not to cause interference when the pedal shaft 300 is rotated, and the inner disk 210. ) And a drive rod formed integrally along the outer circumference of the housing 230 and the housing 230 installed on the pedal shaft 300 to form a cylindrical drum surrounding the outer circumference of the outer disk 220. It is formed integrally with the placket 240 and the inner circumference of the pedal shaft insertion hole 11 of the housing 230 to accommodate the large diameter portion 310 of the pedal shaft 300 and the outer peripheral surface side gear along the outer circumferential surface thereof. 251 is formed, and the forward driving wheel 250 having the forward ratchet gear 252 having a predetermined direction along the inner circumferential surface thereof is formed on the large diameter portion 310 of the pedal shaft 300. A reverse driving wheel having an outer circumferential side gear 251 formed adjacent to the outer circumferential surface and a reverse ratchet gear 262 having a reverse direction with respect to the forward ratchet gear 252 along the inner circumferential surface 260 and the ratchet installation groove 311 of the pedal shaft 11 to selectively transmit the rotational force of the pedal shaft 11 to the predetermined direction to the forward and reverse driving wheels 250 and 260. Quantity for Directional ratchet 270 and the reverse direction of the rotation of the pedal shaft 300, the rotational direction of the reverse drive wheel 260 that rotates together with the forward direction to the forward drive wheel 250 by transferring to the forward drive wheel 250 It is composed of a turning relay gear 280 for inducing a forward rotational force to 240.

At this time, the bidirectional ratchet 270 has a wedge-shaped locking end portion 272 is formed in the upper and lower sides of the ratchet body 271 having a predetermined length to form a bent, the longitudinal direction of the ratchet body 271 The curved portion 274 is formed to protrude, and the rotating shaft 273 is formed at both ends thereof and is supported by the support ring 275 connected to the fixing pin 276 so that the curved portion (2) is rotated in the predetermined direction of the housing 230. One side edge of the 274 is caught by the locking groove 312 formed in the ratchet installation groove 311 and selectively pressed to rotate in engagement with the forward driving wheel 250 or the reverse driving wheel 260. It is the same as the structure of the second embodiment, but there is only a structural difference in contact with the inner circumferential surface of the forward and reverse drive wheels (250, 260).

In addition, the direction change relay gear 280 is rotatably fixed between the inner and outer disks 210 and 220, and tooth-coupled with the outer peripheral surface side gear 251 formed on the outer peripheral surface of the forward drive wheel 250. To the outer circumferential surface side gear 261 and the external gear 281 which is rotatably fixed between the external gear 281 and the inner and outer disks 210 and 220 and formed on the outer circumferential surface of the reverse driving wheel 260. Combination gear 283 is coupled. At this time, the direction change relay gear 280 is preferably provided in a plurality of positions symmetrical with respect to the pedal shaft (300).

In addition, a plurality of bearing balls 13 are spaced apart from each other in the adjacent portions of the inner disk 210, the reverse driving wheel 260, and the forward driving wheel 250 so that the rolling contact does not interfere with each other during each rotation. A structure intervened by

The operation principle of the forward drive converter for a bicycle according to the fourth embodiment of the present invention configured as described above will be described with reference to the accompanying drawings.

Embodiment according to the present invention by improving the shape of the pedal shaft 300 when the rotation in the forward direction by the direct power is transmitted from the pedal shaft 300 to the housing 230 via the bidirectional ratchet 270 It is a simplified structure.

That is, in the forward rotation, as shown in FIGS. 15A and 16A, when the pedal shaft 300 rotates in the forward direction, the bidirectional ratchet 270 is curved by the locking groove 312 of the ratchet installation groove 311. One side edge of the 274 is pressed in the rotational direction, so that the opposite end portion 272 of the pressing portion and the forward ratchet gear 252 of the forward driving wheel 250 integrally formed with the housing 230 are engaged with the housing ( 230 and the driving sprocket 240 are driven forward. At this time, since the reverse driving wheel 260 is engaged with the direction change relay gear 280, it is idling regardless of power transmission.

Meanwhile, as shown in FIGS. 15B and 16B, the bidirectional ratchet 270 rotates in the direction in which the other edge of the curved portion 274 rotates by the catching groove 312 of the ratchet installation groove 311 during the reverse rotation. Pressurizes, so that the opposite end portion 272 of the pressing portion and the reverse ratchet gear 262 of the reverse driving wheel 260 formed to be separated from the housing 230 engage the reverse driving wheel 260 to reverse rotation. The interlocking gear 283 sequentially engaged with the reverse driving wheel 260 rotates in a forward direction, and the external gear 281 engaged with the interlocking gear 283 rotates in reverse, and is engaged with the external gear 281. The forward drive wheel 250 is rotated in the forward direction, and as a result, the bicycle 230 is rotated while the housing 230 and the drive sprocket 240 formed integrally with the forward drive wheel 250 rotate forward. Jean will be driven.

According to the forward drive conversion device for bicycles according to the present invention as described above, it is very convenient to operate the drive forward by only forward or reverse rotation of the pedal without additional lever operation, very convenient operation, fewer parts By using simple structure, it is possible to improve productivity and reduce production cost by reducing assembly process, and it is easy to maintain and maintain the parts such as repair and replacement of parts. This has the advantage of being easy.

In addition, the forward drive conversion device for bicycles according to the present invention is not only generate less load due to friction between the coupling parts during the forward drive by the reverse rotation operation of the pedal, it is also possible to transfer the driving force at the same rotation ratio as in the forward rotation power loss There is no effect and the efficiency is improved.

As described above, the present invention has been described only for the preferred embodiments, but it is apparent to those skilled in the art that various modifications and changes can be made within the scope of the present invention based on the above embodiments. It is obvious that modifications and variations belong to the appended claims.

Claims (20)

A pedal shaft inserted into the boss of the frame to be rotatable, and pedal bars being integrally fixed to both ends protruding to both sides of the boss to rotate together with the pedals; An inner disk and an outer disk disposed to be spaced apart at predetermined intervals on the pedal shaft so as to prevent interference from occurring when the pedal shaft is rotated; A housing formed in a cylindrical drum surrounding the outer circumferences of the inner disk and the outer disk and installed on the pedal shaft to rotate in the same direction when the pedal bar rotates in a predetermined direction; A driving sprocket disposed adjacent to an outer circumference of the housing; A ring-shaped forward drive wheel integrally formed with a driving sprocket so as not to interfere with the rotational driving of the housing and supported by rolling contact with the inner disk and adjacent to an inner circumferential surface of the housing; A ring-shaped reverse drive wheel disposed adjacent to one side of the forward drive wheel and an inner circumferential surface of the housing and supported by a rolling contact with the outer disk; A bidirectional ratchet received on an inner circumferential surface of the housing to selectively transmit a rotational force in a predetermined direction of the housing to the forward and reverse driving wheels; And A direction change relay gear for inducing a forward rotational force to the drive sprocket by converting the rotational direction of the reverse drive wheel which rotates with the forward drive wheel to the forward drive wheel during the reverse rotation of the housing; Bicycle forward drive inverter, characterized in that consisting of. The method of claim 1, The housing is formed on the outer side of the housing body on the disc to form a pedal bar locking projection protruding to a predetermined height so that the pedal bar is rotated, and on one side of the inner peripheral surface of the housing to form a ratchet mounting groove to accommodate the bidirectional ratchet The drive forward drive for the bicycle, characterized in that. The method of claim 1, On the outer circumferential surfaces of the forward driving wheel and the reverse driving wheel, forward ratchet gears and reverse ratchet gears having different directions are formed, respectively, and inner circumferential surface side gears that are tooth-coupled with the redirection relay gear are formed on the respective inner circumferential surfaces thereof. The forward drive inverter for the bicycle. The method of claim 1, The bidirectional ratchet has a bent end portion formed in a wedge shape in both the upper and lower sides of the ratchet body having a predetermined length to form a bent shape, and any one end thereof is elastically supported by a compression spring, and the longitudinal side end of the ratchet body is formed. The forward drive converter for bicycles, characterized in that the rotating shaft surface is formed to be rotatable within the inner peripheral surface of the housing. The method of claim 1, The bidirectional ratchet has a wedge-shaped locking end portion formed in the upper and lower sides of the ratchet body having a predetermined length to form a bent shape, and a curved portion protrudes along the longitudinal direction of the ratchet body to rotate the predetermined direction of the housing. The one side edge of the curved portion is selectively pressed while the forward drive converter for bicycles, characterized in that the rotation to engage with the forward drive wheel or the reverse drive wheel. The method of claim 1, The redirection relay gear is, An internal gear rotatably fixed between the inner and outer disks and tooth-connected with an inner peripheral surface side gear formed on an inner peripheral surface of the reverse driving wheel; And An interlocking gear that is rotatably fixed between the inner and outer disks and is tooth-coupled to an inner circumferential side gear formed on an inner circumferential surface of the forward drive wheel and the internal gear; The forward drive converter for bicycle, characterized in that consisting of. The method of claim 6, And a plurality of the direction change relay gears are provided at positions symmetrical about the pedal shaft. The method of claim 1, Each of the adjacent portion of the inner disk, the forward drive wheel, the reverse drive wheel and the outer disk is a plurality of bearing balls are interposed at regular intervals so as to contact the clouds without mutual interference during each rotation. Drive inverter. A hub shaft installed to be rotatable on a fixed shaft to which the rear wheel side frame is fixed to fix the rim reinforcement of the rear wheel; Inner and outer disks spaced apart and fixed at predetermined intervals on the fixed shaft; A forward drive wheel supported by the inner disk in rolling contact and screwed with the hub shaft, the front end having a ring shape; A ring-shaped reverse driving wheel supported by one side of the forward driving wheel and the outer disk in rolling contact; A driven sprocket which forms a shape surrounding the outer circumferences of the forward driving wheel and the reverse driving wheel and is connected in chain with a driving sprocket of a pedal shaft and is dependently rotated in the same direction by a rotational force transmitted from the driving sprocket; A bidirectional ratchet accommodated on an inner circumferential surface of the driven sprocket for selectively transmitting a rotational force of the driven sprocket to a predetermined and reverse driving wheel; And A direction change relay gear for inducing a forward rotational force on the hub shaft by converting the rotational direction of the reverse drive wheel that rotates with the forward sprocket during forward rotation of the driven sprocket in the forward direction; Bicycle forward drive inverter, characterized in that consisting of. The method of claim 9, The outer disk has a frame holder for fixing the rear wheel side frame outside the fixed shaft insertion hole in the center thereof is configured such that the fixed shaft and the outer disk and the rear wheel side frame can be integrally combined. Forward drive inverter. The method of claim 9, On the outer circumferential surfaces of the forward driving wheel and the reverse driving wheel, forward ratchet gears and reverse ratchet gears having different directions are formed, respectively, and inner circumferential surface side gears that are tooth-coupled with the redirection relay gear are formed on the respective inner circumferential surfaces thereof. The forward drive inverter for the bicycle. The method of claim 9, The bidirectional ratchet has a bent shape in which the wedge-shaped locking end portions are formed in the upper and lower sides of the ratchet body having a predetermined length to form a bent shape, and the locking end portions of the ratchet body are compressed springs so that both locking end portions can be pressed toward the hub axis. And a rotation shaft surface is elastically supported and formed on a longitudinal side end of the ratchet body to be rotatable within an inner circumferential surface of the driven sprocket. The method of claim 9, The redirection relay gear is, An internal gear rotatably fixed between the inner and outer disks and tooth-connected with an inner peripheral surface side gear formed on an inner peripheral surface of the reverse driving wheel; And An interlocking gear that is rotatably fixed between the inner and outer disks and is tooth-coupled to an inner circumferential side gear formed on an inner circumferential surface of the forward drive wheel and the internal gear; The forward drive converter for bicycle, characterized in that consisting of. The method of claim 13, The direction change relay gear is a forward drive conversion device for bicycles, characterized in that provided with a plurality of positions symmetrical about the fixed axis. The method of claim 9, Each of the adjacent portion of the inner disk, the forward drive wheel, the reverse drive wheel and the outer disk is a plurality of bearing balls are interposed at regular intervals so as to contact the clouds without mutual interference during each rotation. Drive inverter. A ratchet mounting groove of a predetermined shape is inserted into the boss of the frame, and pedal bars are integrally fixed to both ends protruding to both sides of the boss to rotate together with the pedals, and to expand the diameter of a partial region. A formed pedal shaft; An inner disk and an outer disk disposed to be spaced apart at predetermined intervals on the pedal shaft so as to prevent interference from occurring when the pedal shaft is rotated; A housing formed on the pedal shaft in the form of a cylindrical drum surrounding the outer circumference of the inner disk and the outer disk; A driving sprocket integrally formed along an outer circumference of the housing; A forward driving wheel formed integrally with the inner circumference of the pedal shaft insertion hole of the housing to accommodate the large diameter portion of the pedal shaft, and the outer circumferential side gear is formed along the outer circumferential surface thereof, and a forward ratchet gear having a predetermined direction along the inner circumferential surface of the housing is formed. ; A reverse driving wheel installed adjacent to the forward driving wheel on the large diameter portion of the pedal shaft, and having an outer circumferential side gear formed around the outer circumferential surface thereof and a reverse ratchet gear having a reverse direction with respect to the forward ratchet gear along the inner circumferential surface thereof; A bidirectional ratchet accommodated in the ratchet mounting groove of the pedal shaft to selectively transmit the rotational force of the pedal shaft in a predetermined direction to the forward and reverse driving wheels; And A direction change relay gear for inducing a forward rotational force to the drive sprocket by converting the rotation direction of the reverse drive wheel rotating together with the forward drive wheel during the reverse rotation of the pedal shaft; Bicycle forward drive inverter, characterized in that consisting of. The method of claim 16, The bidirectional ratchet has a wedge-shaped locking end portion formed in the vertical direction of the ratchet body having a predetermined length to form a bent shape, and a curved portion protrudes along the longitudinal direction of the ratchet body, and a rotation shaft is formed at both ends thereof. When the housing is rotated by a support ring connected by a fixing pin, one side edge of the curved portion may be caught by a locking groove formed in the ratchet installation groove and selectively engaged with the forward driving wheel or the reverse driving wheel when the housing rotates in a predetermined direction. The forward drive inverter for bicycles, characterized in that it can be. The method of claim 16, The redirection relay gear is, An external gear rotatably fixed between the inner and outer disks and tooth-connected with an outer peripheral surface side gear formed on an outer peripheral surface of the forward drive wheel; And An interlocking gear that is rotatably fixed between the inner and outer discs and is tooth-coupled to an outer circumferential side gear formed on an outer circumferential surface of the reverse driving wheel and the outer gear; The forward drive converter for bicycle, characterized in that consisting of. The method of claim 18, And a plurality of the direction change relay gears are provided at positions symmetrical about the pedal shaft. The method of claim 16, The advancing drive conversion device for bicycles, wherein a plurality of bearing balls are interposed at each adjacent portion of the inner disk, the reverse driving wheel, and the forward driving wheel so as to contact the rolling clouds without interfering with each other during each rotation. .