KR20010054173A - Forward Driving Gear for Bicycle - Google Patents

Abstract

PURPOSE: A forward drive converter for bicycle is provided to automatically convert a combined state without operating a lever and to stabilize a system through concentrically arranging pedal shafts. CONSTITUTION: When rotating a pedal shaft(10) in the forward direction, planetary gears(71) are rotated in the reverse direction for being slid along each sliding elongated hole(31). Then, a pedal shaft gear(11) is engaged with idle gears(73) for rotating the idle gears and driving gears(72) for the forward and reverse directions. The driving gears rotate driven gears in the forward direction for rotating a driving sprocket(45) in the forward direction. Herein, repulsive magnets(34,64) installed in inclined grooves(33) and corresponding inclined grooves(63) of a covering disk(30) and a repulsive driving ring(60) generate repulsive magnetic force for rotating in the forward direction. When rotating the pedal shaft in the reverse direction, the planetary gears are rotated in the forward direction for being slid along the sliding elongated holes. Then, the idle gears are meshed with the driving gears for rotating in the forward direction. Thus, the repulsive magnets generate repulsive magnetic force for rotating in the forward direction.

Description

Forward Driving Gear for Bicycles

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. .

Recently, in order to improve the limitations of existing bicycles as described above, practical developments have been made on various forward drive converters capable of driving the bicycle forward even when the pedal is in reverse rotation.

A forward drive converter for bicycles, which is currently being developed and put into practical use, includes a driving drive unit for transmitting driving force of a pedal shaft inserted into a hub of a frame to a driving sprocket, and a pedal that is detachably fastened to the driving drive 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.

Particularly, in the conventional switching drive unit, a plurality of ratchets which are elastically supported toward the ratchet gears by a ring gear-shaped ratchet gear and a spring are respectively installed inside and outside the pedal shaft, and a plurality of ratchets and ratchet gears are provided during the reverse driving of the pedal shaft. The structure that rotates the driving sprocket in one direction, that is, the forward direction while organically engaged and rotates is mainly used, so that the elasticity of the spring may be degraded when used for a long period of time, leading to a malfunction and shortening the product life. In addition, since the ratchet is elastically supported and contacts the ratchet gear, the ratchet is in contact with the ratchet gear, causing noise due to the impact when crossing each tooth, and the ratchet is supported inward or outward during the assembly of the pedal shaft and the housing. Not only that, there is a problem that the assembly process requires a considerable time because the ratchet must be assembled in a pressurized state.

In order to solve the problems shown in the conventional forward drive converter, the applicant of the present invention, the patent application No. 98-10004 (March 23, 1998, one-way bicycle drive device) and 99-31878 (August 3, 1999) , Forward drive converter for bicycles), and Utility Model Registration No. 97-10741 (May 15, 1997, Forward Drive Device for Bicycles; Utility Model Registration No. 141834) and No. 97-10742 (1997. 5) A number of related technologies have been proposed, for example, bicycle forward drive.

However, among the above-mentioned applications, the technical configuration shown in Patent Application No. 98-10004 and Utility Model Registration Application No. 97-10742 is a large and small number of relay gears which are selectively engaged and driven as one-way rotation means of a driving sprocket. As the structure is applied, the pedal shaft gears are eccentrically arranged to maintain the tooth ratio at the forward and reverse rotation by the rotational drive of these relay gears at 1: 1. There was a discomfort in the jacket.

The present invention has been made to solve the problems of the conventional forward drive converter and the forward drive converter proposed by the applicant of the present invention as described above, the main purpose of the driver is to operate in the forward direction or without a separate lever operation It is to provide a forward drive conversion device for a bicycle that can facilitate the operation of the bicycle by enabling the forward drive while the internal coupling state is automatically converted only by the pedal operation to apply the driving force in the reverse direction.

Another object of the present invention is that even when the drive is driven forward by the reverse rotation of the pedal is less noise due to the friction between the coupling parts, the noise is hardly generated, the pedal shaft gear is disposed in the center of the drive sprocket system even for long-term use Its driving stability is ensured, and the disassembly and assembly process is simplified, so it is easy to maintain and replace troubles, as well as to improve productivity, and it can deliver driving power at the same rotation ratio as the forward rotation, so there is no power loss. In addition, it is possible to generate a smooth forward driving force with a small force by applying a structure having a rotational tendency in the forward direction to provide a forward drive converter for a bicycle that can improve the driving efficiency.

Still another object of the present invention is to provide a forward drive converter for a bicycle that can reduce the size of the device because of the use of a small number of parts, and can improve product reliability by improving durability against impact loads.

1 is a combined perspective view of a forward drive converter for a bicycle according to the present invention.

Figure 2 is an exploded perspective view showing the coupling structure of the forward drive conversion apparatus for bicycles according to the present invention from the front side.

Figure 3 is an exploded perspective view showing the coupling structure of the forward drive conversion apparatus for bicycles according to the present invention from the rear side.

Figure 4 is a combined cross-sectional view of the forward drive conversion device for bicycles according to the present invention.

Figures 5a and 5b is a front view showing a state in which the outer cover and the outer support ring formed with a drive sprocket is removed to explain the forward drive operation principle of the forward drive conversion apparatus according to the present invention,

FIG. 5A shows the driving sprocket integrally by one-way rotating means (interlocking gear assembly) engaged with the pedal shaft gear rotating in the forward direction and interlocked with the pedal shaft gear when the pedal is operated in the forward direction (right screw fastening direction). It shows a process of transmitting the rotational force of the forward state toward the driven gear of the formed outer cover,

Fig. 5B is a rotational direction is changed by one-way rotation means (interlock gear assembly) interlocked with the pedal shaft gear rotating in the reverse direction when the pedal is operated in the reverse direction (the right screw release direction) and sliding along the long hole. A front view showing a process of transmitting a forward rotational force toward the gear.

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

※ Explanation of codes for main parts of drawing

One ; Frame 2; Herb

4 ; Pedal bar 5; Pedal Bar High Information Ult

6; Retaining ring 7; Tightening Nut

8 ; Locknut 10; Pedal shaft

11; Pedal shaft gear 12; Bolt fastener

20; Pedal shaft housing 21; Pedal Shaft Insert

22; Bearing 30; Covering disc

31, 51; Sliding long holes 32, 52; Shaft Pin Insert

33; Inclined grooves 34, 64; Rebound magnet

35; Ring 40; Outer cover

41; Pedal shaft exposure hole 42; Driven gear

43, 62; Step 44, 61; Uneven surface

45; Drive sprocket 50; Outer support ring

60; Rebound drive ring 63; Inclined Groove

70; One-way rotating means 71; Planetary gears

72; Electric gear 73; Children gear

74; Shaft pin

Bicycle forward drive conversion apparatus according to the present invention for achieving the above object is inserted into the hub of the frame and the pedal shaft gear is integrally formed around one side and the pedal bar is fixed to both ends protruding to both sides of the hub, respectively A pedal shaft configured to rotate together with a pedal, a pedal shaft housing interposed between an outer side of the pedal shaft and an inner side of the hub of the frame, the pedal shaft housing being fastened and fixed to the hub such that the pedal shaft is rotatable, and one end of the pedal shaft housing. It is formed in the form of a cylindrical drum adjacent to and forming a predetermined inner space therebetween, while maintaining concentricity on the pedal shaft and a driven gear is formed in the ring-shaped inner side of the pedal shaft exposure hole is formed and driven on the outer peripheral surface An outer cover having a sprocket formed thereon, A cover disk which is integrally formed at one end of the pedal shaft housing to form an inner space portion of the outer cover in a state separated from the hub and has a ring frame formed along the outer circumference thereof, and accommodates the driven gear and the inside of the outer cover. An outer support ring seated on a side and a sliding long hole formed so as to have a phase difference in the radial direction between the covering disc and the outer support ring so that any gear is formed on the covering disc and the outer support ring during forward and reverse rotation of the pedal shaft. It is characterized in that it comprises a one-way rotating means consisting of a plurality of interlocking gear assembly for transmitting and converting the rotation state from the pedal shaft gear to the driven gear in the forward direction while sliding along the rotation.

At this time, the one-way rotation means is engaged with the planetary gear in the forward and reverse directions while sliding to the left and right along the sliding long hole formed on the covering disc and the outer support ring in engagement with the pedal shaft gear, and simultaneously with the driven gear An electric gear that indirectly or directly engages with the sliding position of the planetary gear and rotates in reverse direction, and transmits the rotational force transmitted from the planetary gear to the driven gear; And an interlocking gear assembly composed of an idle gear that selectively engages with the planetary gear and transmits rotational force toward the electric gear.

In addition, a plurality of inclined grooves are formed on the outer circumferential surface of the covering disc at regular intervals so that a repelling magnet is embedded in each of the inclined grooves, and a repulsive magnetic force between the body and the covering disc is provided on the inner circumferential surface of the outer cover. Form a plurality of corresponding inclined grooves facing the inclined groove so as to facilitate the forward rotation of the outer cover by burying a resilient magnet having the same polarity as the rebound magnet in the inside of each corresponding inclined groove The installed rebound drive ring is fixed.

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 is mounted on a pedal shaft, and FIGS. 1 to 4 and 6 illustrate the structure of the forward drive converter for a bicycle according to the present invention. 1 is an exploded perspective view of the embodiment, Figures 2 and 3 is an exploded perspective view of the front and rear side for the embodiment, Figure 4 is a cross-sectional view for the embodiment, Figure 6 is another embodiment of the present invention The coupling cross-sectional view for each is shown.

As shown in the figure, the forward drive conversion device for bicycles according to the present invention, the hub of the bicycle frame (1) so that the driving force is transmitted to the rear wheel (not shown) of the bicycle via a chain (not shown) (2) Pedal bar high information bolt in the bolt fastening hole (12) of both ends of the pedal shaft gear (11) of a predetermined radius integrally formed around one side and rotatably inserted into the hub (2) protruding to both sides of the hub (2) (5) by the pedal bar (4) is fixed to each of the pedal shaft (10) to rotate with the pedal (not shown), the outside of the pedal shaft 10 and the frame (1) Interposed between the inside of the hub (2) through the pedal shaft insertion hole 21 through the installation through the pedal shaft 10 to allow the pedal shaft 10 to be rotatable The pedal shaft housing 20 is fastened and fixed to (2) and the cylindrical shaft forming a predetermined inner space portion adjacent to one end of the pedal shaft housing 20 therebetween, the pedal shaft 10 on the It is installed while maintaining concentricity, the driven gear 42 to form a ring shape inward of the pedal shaft exposure hole 41 is formed, the outer cover 40 is formed with a multi-stage drive sprocket 45 on the outer peripheral surface ) And integrally formed at one end of the pedal shaft housing 20 so as to seal the inner space of the outer cover 40 in an isolated state from the hub 2 of the frame 1 and along the outer peripheral portion thereof. Covering disk 30 having a stepped shape and the annulus 35 is formed, the outer support ring 50 for receiving the driven gear 42 and seated on the inner surface of the outer cover 40, and the covering disk 30 and outer support ring 50 It is constructed so as to have a phase difference in the radial direction therebetween, when any one of the gears in the forward and reverse rotation of the pedal shaft 10, the sliding holes 31 and 51 formed on the covering disk 30 and the outer support ring 50 Along the sliding rotation is composed of a one-way rotating means 70 made of a plurality of interlocking gear assembly for converting the transmission state from the pedal shaft gear 11 to the driven gear 42 in the forward direction.

A bearing 22 is interposed between the pedal shaft housing 20 and the pedal shaft 10 to support the rotation of the pedal shaft 10 smoothly, and the fixing ring 6 is disposed outside the bearing 22. ) Is fastened so as not to be separated, and threads are formed on the outer peripheral surfaces of the both ends of the pedal shaft housing 20 to be screwed with the hub 2 of the frame 1, and then a fastening nut ( 7) and the lock nut (8) is fixed to the structure.

The pedal shaft gear 11 at one end of the pedal shaft 10 is formed concentrically on the outer circumference of the pedal shaft 10, and is exposed to the outside of the covering disk 30 so that the outer cover 40 of the outer cover 40 is closed. It is arrange | positioned in an inner space part.

In addition, the one-way rotation means 70 is engaged with the pedal shaft gear 11 and slides left and right along sliding long holes 31 and 51 formed on the covering disc 30 and the outer support ring 50. The planetary gear 71 is interlocked in the forward and reverse directions and the driven gear 42 is engaged with the driven gear 42, and is indirectly or directly engaged with the sliding position of the planetary gear 71, and is transmitted from the planetary gear 71 while rotating in the reverse direction. An electric gear 72 which transmits the predetermined rotational force toward the driven gear 42 and a planetary gear that is slid to either side along the sliding long holes 31 and 51 when the pedal shaft gear 11 rotates forward; And an interlocking gear assembly composed of an idle gear 73 which selectively engages with the 71 to transmit rotational force toward the electric gear 72, such as interlocking gear assembly. A second tank to above, preferably has a set of three interlocking gear assembly is arranged in a uniform 120 ° intervals on the outside of the pedal shaft gear 11.

At this time, the planetary gear 71 and the idle gear 73 is ubiquitous on the outer circumference of the pedal shaft gear 11, the electric gear 72 is the planetary gear 71 and the idle gear 73, and The diameter of the driven gear 42 is compared with the pedal shaft gear 11 so that the electric gear 72 and the pedal shaft gear 11 are not interlocked with each other, and are disposed unevenly across the driven gear 42. This is a rather large design. However, when the diameter of the driven gear 42 is designed to be larger than that of the pedal shaft gear 11 as in the above structure, the distance between the driven gear 42 and the pedal shaft gear 11 may be narrowed. (71) The toothed engagement portion of the idle gear 73 and the electric gear 72 can be widened to improve stability and reduce the thickness of the device, but the driven gear 42 and the pedal shaft gear 11 Due to the size difference of, the rotation ratio cannot be kept exactly 1: 1.

Therefore, in view of this, in another embodiment of FIG. 6, the diameter of the driven gear 42 is kept the same as that of the pedal shaft gear 11, and the space between them is sufficiently secured so that the planetary gear 71 / idle gear at this portion. The tooth engagement of the 73 and the electric gear 72 is such that the electric gear 72 is not interfered with the pedal shaft gear 11. In this embodiment, the planetary gear 71 / idle gear 73 Abrasion and the thickness of the device may be increased slightly as the tooth engaging portion of the electric gear 72 and the narrow gear is reduced, but the rotation ratio is exactly 1: because there is no difference in size between the driven gear 42 and the pedal shaft gear (11). There is an advantage that can be kept at 1.

In each of the above embodiments, some advantages and disadvantages are expected as described in detail above, but it will not need to be considered largely because it is a very minor problem.

Meanwhile, sliding long holes 31 and 51 perforated in a plane symmetrical structure on the corresponding surface to fix both ends of the shaft pin 74 of the interlocking gear assembly to the covering disc 30 and the outer support ring 50, respectively. And shaft pin insertion holes 32 and 52 are formed, and both ends of the shaft pins 74 of the planetary gear 71 are inserted into the sliding holes 31 and 51, respectively, in the sliding holes 31 and 51. Is assembled so as to slide in the left, right direction, the plurality of shaft pin insertion holes (32, 52) are assembled so that the electric gear 72 and the idle gear (73) can be inserted into the respective positions to rotate in place. It is.

Sliding long holes 31 and 51 into which the shaft pin 74 of the planetary gear 71 is inserted on the covering disc 30 and the outer support ring 50, and the shaft pins of the electric gear 72 and the idle gear 73. Each of the shaft pin insertion holes 32 and 52 into which the 74 is inserted is sequentially formed along the reverse direction, but is arranged to have a phase difference in a state in which the size of the radius corresponding to each position increases slightly.

In addition, a plurality of inclined grooves 33 are formed on the outer periphery of the annular frame 35 of the covering disc 30 to maintain a predetermined inclination angle in a forward direction at a predetermined interval so that a rebound magnet (inner) of each inclined groove 33 is formed. 34 is embedded, the inner circumferential surface of the outer cover 40 is formed with a multi-stage step 43, the outer support ring 50 and a separate repulsion drive ring 60 is disposed adjacent to the annulus 35 Each of these is intended to be seated.

The rebound drive ring 60 is inserted and fixed on the outer inner circumferential surface of the outer cover 40 to facilitate the forward rotation of the outer cover 40 by the magnetic backlash with the covering disk 30 On the ring inner circumferential surface having a stepped 62, a plurality of corresponding inclined grooves 63 are formed to form an inclined angle opposite to the inclined groove 33 of the covering disc 30, and to the inside of each corresponding inclined groove 63. The resilient magnet 64 having the same polarity as the repulsive magnet 34 is embedded, and at this time, the uneven surface 61 is repeatedly formed on the outer circumferential surface of the repulsive driving ring 60, and the outer cover ( The concave-convex surface 44 corresponding to the concave-convex surface 61 is also formed on the inner circumferential surface of 40 so that the concave-convex surfaces 44 and 61 are secured by mutual engagement between the concave-convex driving ring 60 when inserted. To achieve.

On the other hand, on the other hand, the concave-convex surface 61 is repeatedly formed on the outer circumferential surface of the rebound drive ring 60, and the rebound drive ring 60 is forcibly pressed into the inside of the outer cover 40 to the outer cover 40 The concave-convex surface 44 corresponding to the concave-convex surface 61 may also be integrally coupled to the inner circumferential surface thereof.

The operation of the forward drive converter for a bicycle according to the present invention having such a configuration will be described based on the above drawings and FIGS. 5A and 5B as follows.

5A and 5B show a front view of the outer cover 40 and the outer support ring 50 with the driving sprocket 45 formed thereon, and FIG. 5A shows the pedal in the forward direction (right screw fastening direction). In this case, the idle gear 73 and the electric gear 72 are driven by the planetary gear 71 interlocking with the pedal shaft gear 11 rotating in the forward direction and sliding along the sliding long holes 31 and 51. The sprocket 45 is a process of sequentially transmitting the rotational force of the forward state toward the driven gear 42 of the outer cover 40 formed integrally, Figure 5b is the pedal in the reverse direction (right screw release direction) When operated, the electric gear 72 is driven by the planetary gear 71 interlocking with the pedal shaft gear 11 rotating in the reverse direction and sliding along the sliding long holes 31 and 51, and then rotating the rotating room. Is converted illustrates a process of transmitting the rotational force to the state of the forward toward the driven gear 42.

First, when the pedal shaft 10 rotates in the forward direction, as shown in FIGS. 1 to 4 and 5a, the three planetary gears 71 engaged with the pedal shaft gear 11 are reversed. And the pedal shaft gear 11 and the driven gear 42 when reaching the right end in the drawing of the sliding long hole 42, which slides forward along each sliding long hole 31 while rotating. After tooth coupling with the idle gear 73 installed at an independent position, the idle gear 73 and the electric gear 72 are rotated in the forward and reverse directions, respectively, and the electric gear 72 moves the driven gear 42 in the forward direction. By rotating the drive sprocket 45 is to rotate in the forward direction. At this time, the resilient magnets 34 and 64 of the same polarity installed in the inclined groove 33 and the corresponding inclined groove 63 of the covering disc 30 and the repelling driving ring 60 respectively generate a repulsive magnetic force in the forward direction. Will provide more smooth rotational force.

On the other hand, when the pedal shaft 10 rotates in the reverse direction, as shown in FIGS. 1 to 4 and 5B, three planetary gears 71 engaged with the pedal shaft gear 11 are in the forward direction. While rotating in the direction of sliding along the respective sliding long holes 31 in the reverse direction, when the sliding end is reached to the left end portion of the sliding long hole 42, the electric gear 72 is engaged directly with the electric gear 72 Rotation of the reverse direction, the electric gear 72 is to drive the sprocket 45 is rotated in the forward direction by rotating the driven gear 42 in the forward direction. At this time, the idle gear (73) installed at a position independent of the pedal shaft gear (11) and the driven gear (42) is tooth-coupled with the electric gear (72) so that it rotates in the forward direction irrespective of power transmission. In this way, even when the pedal shaft 10 rotates in the reverse direction, the resilient magnet 34 having the same polarity installed in the inclined groove 33 and the corresponding inclined groove 63 of the covering disc 30 and the rebound driving ring 60. 64 each generate a repulsive magnetic force to provide a smooth rotational force in the forward direction.

In addition, since the driving principle for the embodiment of FIG. 6 is also the same as described above, a detailed description thereof will be omitted.

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.

According to the forward drive conversion device for bicycles according to the present invention as described above, by allowing the driver to automatically drive the combined state of the internal drive only by the pedal operation to apply the driving force in the forward or reverse direction without a separate lever to enable the forward drive It is convenient to operate the bicycle, and even when the drive is driven forward by the reverse rotation of the pedal, there is little load due to friction between the coupling parts, so that little noise is generated, and the pedal shaft gear is disposed at the center of the driving sprocket. As long as it is used for a long time, the driving stability of the system is ensured, and the disassembly and assembly process is simplified, so it is easy to maintain and replace troubles, improve productivity and reduce production costs, and drive power at the same rotation rate as the normal rotation. relay Since there is no power loss, a structure having a forward rotational tendency by the repulsive force of the magnetic force can be applied to generate a smooth forward driving force with a small force, thereby improving driving efficiency.

In addition, the forward drive converter for bicycles according to the present invention uses a small number of parts can reduce the size of the device, improved durability against impact loads, by eliminating the structure of the ratchet elastically supported by the spring It is possible to use for a long time, there is no fear of malfunction due to the elasticity of the spring, there is no impact noise caused by the ratchet, so that the effect of improving the product reliability is exerted.

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 (5)

A pedal shaft inserted into the hub of the frame and integrally formed with a pedal shaft gear around one side thereof, and pedal bars fixed to both ends protruding from both sides of the hub to rotate together with the pedal; A pedal shaft housing interposed between an outer side of the pedal shaft and an inner side of the hub of the frame, the pedal shaft housing being fastened to the hub so that the pedal shaft is rotatable; Adjacent to one end of the pedal shaft housing in the form of a cylindrical drum to form a predetermined inner space therebetween and is installed while maintaining a concentric on the pedal shaft, the driven to form a ring shape inside the pedal shaft exposure hole An outer cover having a gear and having a driving sprocket formed on an outer circumferential surface thereof; A covering disc integrally formed at one end of the pedal shaft housing and closed at an outer circumference thereof so as to seal the inner space of the outer cover while being isolated from the hub of the frame; An outer support ring accommodating the driven gear and seated on an inner surface of the outer cover; And It is constructed so as to have a phase difference in the radial direction between the covering disc and the outer support ring, so that any gear is driven from the pedal shaft gear while sliding and rotating along a sliding hole formed on the covering disc and the outer support ring during the forward and reverse rotation of the pedal shaft. One-way rotating means composed of a plurality of interlocking gear assembly for converting the rotational state leading to the gear in a forward direction; Bicycle forward drive inverter, characterized in that configured to include. The method of claim 1, The one-way rotation means, Planetary gears engaged with the pedal shaft gear and interlocked in the right and reverse directions while sliding left and right along sliding holes formed on the covering disc and the outer support ring; An electric gear that meshes with the driven gear and simultaneously transmits the rotational force transmitted from the planetary gear toward the driven gear while rotating in an indirect or direct direction in accordance with the sliding position of the planetary gear; And An idle gear that selectively engages with the planetary gear that is slid in either direction along the sliding long hole when the pedal shaft gear is rotated forward to transmit rotational force toward the electric gear; The forward drive converter for bicycle, characterized in that the interlock gear assembly consisting of. The method according to claim 1 or 2, The one-way rotation means for the forward drive conversion device for bicycles, characterized in that made of two or more sets of interlocking gear assembly uniformly arranged on the outside of the pedal shaft gear. The method of claim 1, A plurality of inclined grooves are formed on the outer circumferential surface of the covering disc at predetermined intervals so that a repelling magnet is embedded in each of the inclined grooves, and on the inner circumferential surface of the outer cover by a repulsive magnetic force between the body and the covering disc. Forming a plurality of corresponding inclined grooves facing the inclined groove to facilitate the forward rotation of the outer cover, and embedded a resilient magnet having the same polarity as the rebound magnet inside each corresponding inclined groove The forward drive converter for a bicycle, characterized in that the rebound drive ring is fixed. The method of claim 4, wherein The uneven surface is repeatedly formed on the outer circumferential surface of the rebound drive ring, and the rebound drive ring is forcibly pressed into the inner side of the outer cover to be integrally coupled to the uneven surface corresponding to the uneven surface on the inner circumferential surface of the outer cover. The forward drive converter for the bicycle.