KR20010016779A - Forward Driving Gear for Bicycle - Google Patents

Abstract

PURPOSE: A device for converting forward driving for a bicycle is provided to transmit the driving power for allowing the bicycle to travel forward while maintaining the same speed rate as the forward directional rotation even when a pedal is rotated backwardly. CONSTITUTION: A device for converting forward driving for a bicycle includes a pedal shaft rotating with a pedal, a pedal shaft housing(20) fixed on a boss of a frame for rotating the pedal shaft, a ring gear housing(30) mounted at the end of the pedal shaft and having a ring gear(33) and a driving sprocket(34) formed on an inner surface and the outer surface respectively, an inner support ring(40) disposed at the end of the pedal shaft, an unidirectional rotating part(50) mounted between the inner surface of the inner support ring and the outer surface of a friction ring for controlling a rotational direction of the inner support ring, a two-step repeating gear(61) engaging with the pedal shaft gear and the ring gear, a two-step repeating gear braking part(60) for restricting the rotation of the two-step repeating gear, and an outer support ring(35) for supporting the end of a shaft pin of the two-step repeating gear.

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. .

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.

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. Since the structure that rotates the driving sprocket in one direction, that is, the forward direction while organically engaged and rotates is mainly used, the elasticity of the spring may be degraded when used for a long period of time, resulting in a malfunction of the product and shortened 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.

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 friction between the coupling parts even when driving forward by the reverse rotation operation of the pedal as well as to transmit the driving force at the same rotation ratio as 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 achieve a simple structure using a small number of parts can be expected to improve the productivity by reducing the bicycle assembly process, to reduce the production cost, to quickly and easily disassembly and assembly is made to troubleshoot The present invention provides a forward drive converter for bicycles that can be easily maintained and replaced.

Still another object of the present invention is to provide a bicycle forward driving converter that can be used for a long time by eliminating the structure of the ratchet elastically supported by the spring, there is no fear of malfunction due to the elasticity of the spring is reduced, almost no noise generated Is in.

1 is an exploded perspective view showing a part of the coupling structure of the forward drive conversion apparatus for bicycles according to an embodiment of the present invention.

2 is a cross-sectional view of the combination of the bicycle forward drive conversion apparatus according to the embodiment of FIG.

3a and 3b show the operation principle and structure of the one-way rotating means applied to the forward drive converter according to the embodiment of FIG.

Figure 3a is a cross-sectional view of the state in which the one-way rotation means (ratchet) is released by the rotation between the inner ring of the rotation and the friction ring of the fixed pedal shaft housing when the pedal is operated in the forward direction (right screw fastening direction); ,

3B is a cross-sectional view of the state in which the one-way rotating means (ratchet) rotates and stops the inner support ring when the pedal is operated in the reverse direction (right screw release direction) by rubbing the two-stage relay gear in reverse direction. to be.

4A and 4B illustrate an operation principle of a two-stage relay gear applied to a forward drive converter according to the embodiment of FIG. 1 to relay between a pedal shaft gear and a ring gear.

FIG. 4a is integrally rotated forward with the ring gear while the two-speed gear is stopped by the stopper gear while the two-speed gear is slid along the long hole when the pedal shaft gear rotates in the forward direction by the forward manipulation of the pedal. It is a section of the state

4B is a state in which, when the pedal shaft gear is rotated in the reverse direction by the reverse operation of the pedal, the two-stage relay gear is slid along the long hole and released from the stopper gear and then engaged with the ring gear to rotate forward. It is a cross section of.

5A and 5B illustrate an operation principle of a two-stage relay gear applied to a forward drive converter according to another embodiment of the present invention to relay between a pedal shaft gear and a ring gear.

FIG. 5A is integrally rotated forward with the ring gear while the two-speed gear is slid along the long hole and stopped by the stopper pin when the pedal shaft gear is rotated in the forward direction by the forward manipulation of the pedal. It is a section of the state

5B is a state in which, when the pedal shaft gear is rotated in the reverse direction by the reverse operation of the pedal, the two-stage relay gear is slid along the long hole to be released from the stopper pin and then engaged with the ring gear to rotate forward. It is a cross section of.

FIG. 6 is an exploded perspective view of a partially cutaway view showing a coupling structure of a forward drive converting apparatus according to still another embodiment of the present invention; FIG.

7a and 7b show the operation principle and structure of the one-way rotating means applied to the forward drive converter according to the embodiment of FIG.

7A is a cross-sectional view of the state in which the one-way rotating means (wedges) are released while being engaged between the inner support ring and the friction ring which rotate in the forward direction when the pedal is operated in a forward direction, and then rotated while being released.

FIG. 7B is a cross-sectional view of the state in which the inner support ring is stopped by rotating the one-way rotating means (wedge) toward the narrow gap by the reverse sliding of the two-stage relay gear when the pedal is operated in the reverse direction.

FIG. 8 is an exploded perspective view of a partially cutaway view showing a coupling structure of a bicycle forward drive converter according to still another embodiment of the present invention; FIG.

9A and 9B illustrate an operation principle and a structure of the one-way rotating means applied to the forward drive converter according to the embodiment of FIG.

9A is a cross-sectional view of the state in which the one-way rotating means (ratchet wedges) are released while being released while being rotated between the inner support ring and the friction ring which rotate in the forward direction when the pedal is operated in the forward direction, and rotated;

Fig. 9B is a cross-sectional view of the state in which the inner support ring is rotated and stopped while the one-way rotating means (ratchet wedge) caught by the ratchet gear is pushed into a narrow gap when the pedal is operated in the reverse direction, and the ratchet gear is pushed into the narrow gap by the reverse sliding of the two-stage relay gear.

※ Explanation of codes for main parts of drawing

One ; Frame 2; boss

3a, 3b, 3c; Bearing 4; Pedal Bar

5; Pedal Bar High Information Ult 6; Retaining ring

7; Tightening nut 8; Locknut

10; Pedal shaft 11; Pedal shaft gear

20; Pedal shaft housing 21; Pedal Shaft Insert

22; Covering disc 23; Friction ring

24; Friction surface 30; Ring gear housing

31; Pedal shaft exposure hole 32; Chin

33; Ring gear 34; Drive sprocket

35; Outer support ring 40; Inner support ring

41; Shaft pin insertion hole 42; Sliding longevity

43; Cam hole 50; One-way rotating means

51; Ratchet 52; Wedge

53; Flow field 54; Push pin

55; Ratchet wedges 56; Ratchet Gear

60; Two-stage relay gear braking means 61; Double Stage Gears

62; Shaft pin 63; Stopper gear

64; Stopper pin

The forward drive converter for bicycle according to the present invention for achieving the above object is inserted into the boss of the frame and the pedal shaft gear is integrally formed around one side and the pedal bars are fixed to both ends protruding to both sides of the boss, respectively A pedal shaft adapted to be rotatable with the pedal, and a covering interposed between the outer side of the pedal shaft and the boss inner side of the frame, the cover shaft being fastened and fixed to the boss so that the pedal shaft is rotatable and isolated from the frame at one end thereof. A pedal shaft housing is formed on which the disk is formed and a friction ring protrudes from the center on the outer surface thereof, and a cylindrical drum which forms a predetermined inner space portion adjacent to the outer surface of the covering disk. Is installed on the pedal shaft A ring gear housing having ring gears and drive sprockets formed on the inner circumferential surface and the outer circumferential surface thereof, respectively, and an inner support disposed adjacent the outer surface of the covering disk of the pedal shaft housing while maintaining a predetermined gap along the circumference of the friction ring; A one-way rotating means disposed between the ring, the inner circumferential surface of the inner support ring and the outer circumferential surface of the friction ring, and controlling the rotational direction of the inner support ring, and sliding a minute length along the circumferential direction on the outer surface of the inner support ring; And a two-stage relay gear installed to rotate in two stages with the pedal shaft gear and the ring gear, and installed on an outer surface of the inner support ring to limit rotation of the two-stage relay gear during forward sliding of the two-stage relay gear. Two-stage relay gear braking means, and the inner support ring It forms a shape that is characterized by a ring adapted to include an outer support ring disposed adjacent to the inner side of the gear housing so as to support one end of the two intermediate gear chukpin.

At this time, the one-way rotation means is formed in a cylindrical shaft projection shape so that one end is inserted into the inner peripheral surface side of the inner support ring at equal intervals and rotatable at a predetermined angle and the other end contacting the outer peripheral surface of the friction ring is the inner support ring. Characterized in that it consists of a plurality of ratchet forming an inclined shape so as to brake the rotation of the inner support ring during the reverse rotation of the.

In addition, the two-stage relay gear braking means are respectively installed in a position adjacent to the two-stage relay gear on the outer surface of the inner support ring and engaged with the teeth of the two-stage relay gear to stop the rotation of the two-stage relay gear after the forward sliding of the two-stage relay gear. Characterized in that it consists of a stopper gear.

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 4b illustrate the structure of the forward drive converter for a bicycle according to an embodiment of the present invention. 1 and 2 are partially cutaway exploded perspective and coupling cross-sectional views showing a coupling structure for the embodiment, Figures 3a and 3b is a one-way rotating means 50 applied to the forward drive converter according to the embodiment of FIG. Figure 3a shows the operating principle of the structure and its structure, Figure 3a is a pedal shaft housing 20 and the fixed support body of the inner support ring 40 and the fixed rotation when the pedal (not shown) in the forward direction (right screw fastening direction) 3B is a two-stage repeating gear 61 when the pedal is operated in the reverse direction (the right screw release direction) between the friction ring 23 and the ratchet 51, which is the one-way rotation means 50, is rotated by being released. Fig. 4A is a cross-sectional view of the ratchet 51 being rotated to stop the inner support ring 40 while the ratchet 51 is rubbed with the outer circumferential surface of the friction ring 23 by the reverse sliding of FIG. And FIG. 4B illustrates the operation principle of the two-stage relay gear 61 applied to the forward drive converter according to the embodiment of FIG. 1 to relay between the pedal shaft gear 11 and the ring gear 33. 3A, when the pedal shaft gear 11 rotates in the forward direction by the forward manipulation of the pedal, the two-stage relay gear 61 is slid along the sliding long hole 42 and stopped by the stopper gear 63. 4B is a cross-sectional view of integrally rotating the ring gear 33 together with the ring gear 33 while FIG. 4B shows the two-stage relay gear when the pedal shaft gear 11 rotates in the reverse direction by operating the pedal in reverse with respect to FIG. The cross-sectional view of the state in which the 61 is slid along the sliding hole 42 and released from the stopper gear 63 and then engaged with the ring gear 33 to rotate forward is shown. A.

As shown in the figure, the forward drive conversion device for a bicycle according to an embodiment of the present invention, so that the driving force is transmitted to the rear wheel (not shown) of the bicycle via a chain (not shown), bicycle frame ( Pedal bar high information bolt 5 is inserted into the boss 2 of 1) to be rotatable, and a pedal shaft gear 11 having a predetermined radius is integrally formed around one side and protrudes to both sides of the boss 2. As a result, the pedal bar 4 is fixed to each other so that the pedal shaft 10 is rotatable with the pedal and interposed between the outside of the pedal shaft 10 and the inside of the boss 2 of the frame 1. A covering disc 22 which is fastened and fixed to the boss 2 so that the shaft 10 is rotatable and is isolated from the frame 1 at one end thereof is formed and centered on the outer surface thereof. And a cylindrical drum forming a predetermined inner space therebetween adjacent to the outer surface of the covering disk 22 and the pedal shaft housing 20 protruding from the friction ring 23 to maintain a predetermined radius. A ring gear housing 30 mounted on the pedal shaft 10 and having a ring gear 33 and a multi-stage drive sprocket 34 formed on the inner and outer circumferential surfaces thereof, respectively, and the covering of the pedal shaft housing 20; The inner support ring 40 and the inner circumferential surface of the inner support ring 40 and the friction ring 23 which are disposed on the outer surface of the disk 22 and maintain a predetermined gap along the circumference of the friction ring 23. The pedal is installed between the outer circumferential surface of the one way rotation means 50 for controlling the rotational direction of the inner support ring 40, the sliding while sliding the length along the circumferential direction on the outer surface of the inner support ring 40 Axis A two-stage repeating gear 61 installed to rotate in engagement with the gear 11 and the ring gear 33 in a two-stage; and an outer surface of the inner support ring 40, Shaft pin 62 of the two-stage repeating gear 61 and the two-stage repeating gear braking means 60 for limiting the rotation of the two-stage repeating gear 61 and the inner support ring 40 when sliding forward. The outer support ring 35 is disposed adjacent to the inner surface of the ring gear housing 30 so as to support one end.

Bearings 3a, 3b and 3c are interposed between the pedal shaft housing 20 and the pedal shaft 10 so as to smoothly rotate the pedal shaft 10, and the bearing 3a ( The fixing ring 6 is fastened to the outside of 3c) so as not to be separated, and threads are formed on the outer circumferential surfaces of both ends of the pedal shaft housing 20 so as to be screwed with the boss 2 of the frame 1. The fastening nut 7 and the lock nut 8 are fixed to one end thereof.

The pedal shaft gear 11 of one end of the pedal shaft 10 is formed on the outer circumference of the wheel forming a multi-stage rounded jaw structure, the wheel outer peripheral surface of the rounded jaw shape and the pedal shaft insertion hole of the pedal shaft housing 20 ( 21) It is seated on the inner circumferential surface, the outer peripheral surface of the friction ring 23 of the pedal shaft housing 20 forms a friction surface 24 in contact with the one-way rotation means (50).

In addition, the ring gear housing 30 has a tubular pedal shaft exposure hole 31 through which one end of the pedal shaft 10 can be formed, and an inner end of the ring gear housing 30 is formed. A round jaw 32 is formed to be in contact with the outer circumferential surface so as to be locked by the bearing 3c and the fixing ring 6.

In addition, the inner support ring 40 has a plurality of pairs of shaft pin insertion holes 41 and sliding long holes 42 formed on the surface facing the ring gear housing 30, so that the stopper gear 63 or stopper will be described later. The pin 64 and the shaft pin 62 of the two-stage relay gear 61 can be fixed.

In addition, the one-way rotation means 50 is applied to the embodiment, one end is inserted into the inner circumferential surface side of the inner support ring 40 at an equal interval to form a cylindrical shaft projection shape so as to be rotatable at a predetermined angle and the friction The other end in contact with the outer circumferential surface of the ring 23 is composed of a plurality of ratchets 51 having an inclined shape to brake the rotation of the inner support ring 40 during the reverse rotation of the inner support ring 40, The two-stage relay gear braking means (60) are installed at positions adjacent to the two-stage relay gear (61) on the outer side of the inner support ring (40), respectively, and the two-stage relay gear (61) after forward sliding of the two-stage relay gear (61). It is composed of a stopper gear 63 to engage the teeth of the stop gear of the two-stage relay gear (61).

Referring to the operation principle of the forward drive conversion device for a bicycle according to an embodiment of the present invention described above based on the accompanying drawings as follows.

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 10 rotates in the forward direction, as shown in FIGS. 3A and 4A, the pedal shaft gear 11 meshes with the plurality of two-stage relay gears 61 to rotate each sliding hole 42. When sliding to the forward direction, and reaches the end of the sliding long hole 42 is completed sliding the teeth of the two-stage relay gear 61 and the stopper gear 63 is engaged with each other and stops rotating, as described above The driving sprocket 34 rotates in the forward direction by forcibly rotating the ring gear 33 while the two-stage relay gear 61 is stopped. At this time, since the ratchet 51 passes through the friction surface 24 between the inner support ring 40 and the friction ring 23 so that mutual interference does not occur, the inner support ring 40 is a ring gear housing 30. ) Can be rotated integrally together.

Next, when the pedal shaft 10 rotates in the reverse direction, as shown in FIGS. 3B and 4B, the pedal shaft gear 11 is engaged with the plurality of two-stage relay gears 61 to rotate each sliding hole. Sliding in the reverse direction along the 42, at this time, the ratchet 51 between the inner support ring 40 and the friction ring 23 is upright rotating along the friction surface 24, so that mutual interference occurs The inner support ring 40 maintains the rotation stop state integrally with the pedal shaft housing 20, and after reaching the end of the sliding long hole 42, the sliding is completed from the stopper gear 63 The driving sprocket 34 rotates in the forward direction by rotating the ring gear 33 in the same direction while the separated two-stage relay gear 61 rotates forward at the point.

In the operation process of the above embodiment, the two-stage relay gear 61 is rotated while the small diameter gear meshes with the pedal shaft gear 11 and the stopper gear 63, the large diameter gear is the ring gear 33 In this case, the dual rotation gear 61 having an appropriate diameter difference can be used to maintain a rotation ratio of 1: 1 when the bicycle is driven forward and backward.

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.

Meanwhile, FIGS. 5A and 5B show an operating principle of a two-stage relay gear 61 applied to a forward drive converter according to another embodiment of the present invention to relay between the pedal shaft gear 11 and the ring gear 33. In one embodiment, the two-stage relay gear braking means 60 according to the embodiment are installed at positions adjacent to the two-stage relay gear 61 on the outer side of the inner support ring 40 to slide forward of the two-stage relay gear 61. It can be configured as a stopper pin 64 to sandwich the teeth of the two-stage relay gear 61 to stop the rotation of the two-stage relay gear 61. When the two-stage relay gear 61 reaches a position close to the stopper pin 64, the stopper pin 64 is inserted between the teeth while maintaining the distance at which the two-stage relay gear 61 can be stopped. Each of the shaft pin insertion holes 41 may be formed on the inner support ring 40 at appropriate intervals.

5A shown in the above description is related to FIG. 3A, when the pedal shaft gear 11 rotates in the forward direction by the forward manipulation of the pedal, the two-stage relay gear 61 slides along the sliding long hole 42 and stoppers. Fig. 5B is a cross-sectional view showing the state of integrally forward rotation with the ring gear housing 30 while being stopped by the pin 64. Fig. 5B relates to the pedal shaft gear 11 by reverse operation of the pedal in relation to Fig. 3B. ) Is rotated in the reverse direction, the two-stage relay gear 61 is slid along the sliding long hole 42 and released from the stopper pin 64 and then engaged with the ring gear 33 to rotate in the forward direction. As shown, only the configuration of the two-stage relay gear braking means 60, the operation principle is the same as the line embodiment It is omitted for explanation.

The forward drive converter of the present invention described above may be implemented by modifying the configuration of the one-way rotation means (50). That is, an embodiment using the wedges 52 of the magnetic body as shown in Figs. 6 to 7B and an embodiment using the ratcheting wedges 55 as shown in Figs. Can be.

First, Figure 6 shows a partially cutaway exploded perspective view showing a coupling structure of the forward drive converter according to another embodiment of the present invention, the one-way rotating means 50, the inner peripheral surface of the inner support ring 40 Cam holes 43 eccentric to one side to form a gap difference with the outer peripheral surface of the friction ring 23, and extends in the longitudinal direction of the pedal shaft 10 on the outer surface of the covering disk 22 in the gap. A fixing pin 54 is formed, and a magnetic wedge 52 having a flow field hole 53 for accommodating the fixing pin 54 is provided to support the inner side when the inner supporting ring 40 is rotated in the reverse direction. It is configured to be able to brake rotation while being compressed between the gap between the ring 40 and the friction ring 23.

The operating principle for this embodiment is as shown in Figs. 7A and 7B. That is, FIGS. 7A and 7B illustrate an operation principle and a structure of the one-way rotating means 50 applied to the forward drive converter according to the embodiment of FIG. 6, and as shown in FIG. 7A, the pedal is operated in the forward direction. In this case, the wedge 52 is released between the inner support ring 40 and the friction ring 23 which rotates in a forward direction toward the wide gap, whereby the pedal shaft gear 11 is rotated. The two-stage relay gear 61 and the stopper gear 63 when the end portion of the sliding long hole 42 is slid in a forward direction along each sliding long hole 42 while rotating in engagement with the 61, and the sliding is completed. The teeth of the gear meshes with each other and stops rotating. For this reason, the ring gear 33 is forcibly forced in the state where the two-stage relay gear 61 is stopped. By rotating the drive sprocket 34 is shown to rotate in the forward direction. At this time, the wedge 52 is made of a magnetic material can be easily pulled out in a state attached to the inner peripheral surface of the inner support ring (40).

On the contrary, when the pedal is operated in the reverse direction as shown in FIG. 7B, the pedal shaft gear 11 is engaged with the plurality of two-stage relay gear 61 and rotates in the opposite direction along each sliding long hole 42. At this time, the inner support ring 40 is rotated and stopped while the wedge 52 is press-fitted toward the narrow gap between the inner support ring 40 and the friction ring 23 by the reverse sliding of the two-stage relay gear 61. Since the inner support ring 40 is maintained in a state of being rotated integrally with the pedal shaft housing 20, and after reaching the end of the sliding long hole 42, the stopper gear ( The two-stage repeating gear 61 separated from the 63 rotates the ring gear 33 in the same direction while rotating forward at that point, thereby driving the drive sprocket 3. 4) will rotate in the forward direction.

On the other hand, Figure 8 is a partially cutaway exploded perspective view showing a coupling structure of the bicycle forward drive conversion apparatus according to another embodiment of the present invention, the one-way rotating means 50, the inner support ring 40 The inner peripheral surface of the friction ring 23 forms a cam hole 43 eccentric to one side so as to form a gap difference with the outer peripheral surface, the ratchet gear 56 is formed in the opposite direction along the inner peripheral surface of the cam hole 43 is formed A fixing pin 54 extending in the longitudinal direction of the pedal shaft 10 is formed on the outer surface of the covering disk 22 in the gap, and a flow field hole 53 is formed to accommodate the fixing pin 54. A ratchet wedge 55 is provided to be rotated while being squeezed between the gap between the inner support ring 40 and the friction ring 23 by the ratchet gear 56 during the reverse rotation of the inner support ring 40. Braking It is configured to be.

The operating principle for this embodiment is as shown in Figs. 9A and 9B. That is, FIGS. 9A and 9B illustrate an operation principle and a structure of the one-way rotating means applied to the forward drive converter according to the embodiment of FIG. 8, when the pedal is operated in the forward direction as shown in FIG. 9A. The ratchet wedge 55 is released between the inner support ring 40 and the friction ring 23 which rotates forward while being released toward the wide gap to rotate, and the pedal is operated in the reverse direction as shown in FIG. 9B. In this case, the ratchet wedge 55 caught by the ratchet gear 56 is pushed toward the narrow gap by the reverse sliding of the two-stage relay gear 61 to stop the inner support ring 40 in rotation. The drive sprocket 34 is always driven forward.

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. There is no power loss and the efficiency is improved.

In addition, the forward drive converter for bicycles according to the present invention can be used for a long time by eliminating the structure of the ratchet elastically supported by the spring, there is no fear of malfunction due to the elasticity of the spring, the impact noise generated by the ratchet Therefore, the effect of improving the reliability of the product 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 (6)

A pedal shaft inserted into a boss of the frame and integrally formed with a pedal shaft gear around one side thereof, and pedal bars fixed to both ends protruding to both sides of the boss to rotate together with the pedal; Interposed between the outside of the pedal shaft and the inside of the boss of the frame is formed with a covering disk which is fixed to the boss so that the pedal shaft is rotatable and can be isolated from the frame at one end thereof and predetermined from the center on the outer surface thereof. A pedal shaft housing with a friction ring projecting to maintain a radius; A ring gear housing is formed on a pedal shaft and is formed on a pedal shaft and has ring gears and driving sprockets formed on inner and outer circumferential surfaces thereof, respectively, in the form of a cylindrical drum adjacent to an outer surface of the covering disk to form a predetermined inner space therebetween. ; An inner support ring disposed on an outer surface of a covering disc of the pedal shaft housing to maintain a predetermined gap along a circumference of the friction ring; One-way rotating means installed between an inner circumferential surface of the inner support ring and an outer circumferential surface of the friction ring to control a rotation direction of the inner support ring; A two-stage repeating gear provided to rotate in engagement with the pedal shaft gear and the ring gear in two stages while sliding a small length along the circumferential direction on the outer surface of the inner support ring; A two-stage repeating gear braking means provided on an outer surface of the inner support ring to limit rotation of the two-stage repeating gear when the two-stage repeating gear slides forward; And An outer support ring having a shape corresponding to the inner support ring and disposed adjacent to an inner surface of the ring gear housing to support one end of the shaft pin of the two-stage relay gear; Bicycle forward drive inverter, characterized in that configured to include. The method of claim 1, The one-way rotation means, One end of the inner support ring is inserted into the inner circumferential surface of the inner support ring at equal intervals to form a cylindrical shaft protrusion shape so as to be rotatable at a predetermined angle, and the other end contacting the outer circumferential surface of the friction ring has an inner support ring during the reverse rotation of the inner support ring. The forward drive converter for bicycles, characterized in that consisting of a plurality of ratchet forming an inclined shape to brake the rotation of the. The method of claim 1, The one-way rotation means, The inner circumferential surface of the inner support ring forms a cam hole eccentrically to one side so as to form a gap with the friction ring outer circumferential surface, and a fixing pin extending in the longitudinal direction of the pedal shaft is formed on the outer surface of the covering disc in the gap. The magnetic body is formed with a wedge formed of a flow field to accommodate the fixed pin is configured to brake the rotation while being compressed between the gap between the inner support ring and the friction ring during the reverse rotation of the inner support ring Forward drive inverter for bicycles. The method of claim 1, The one-way rotation means, The inner circumferential surface of the inner support ring forms a cam hole eccentrically to one side so as to form a gap difference with the outer circumferential surface of the friction ring, and a ratchet gear is formed in a reverse direction along the inner circumferential surface of the cam hole, and the outer surface of the covering disc in the gap is formed. A fixed pin extending in the longitudinal direction of the pedal shaft is formed thereon, and a ratchet wedge having a flow hole for accommodating the fixed pin is provided, and the inner support ring is caught by the ratchet gear during the reverse rotation of the inner support ring. And a brake configured to brake the rotation while being compressed between the gaps of the friction ring. The method of claim 1, The two-stage relay gear braking means is installed at positions adjacent to the two-stage relay gears on the outer side of the inner support ring, respectively, and stops the rotation of the two-stage relay gears by engaging the teeth of the two-stage relay gears after forward sliding of the two-stage relay gears. The forward drive converter for bicycle, characterized in that consisting of. The method of claim 1, The two-stage relay gear braking means is installed at positions adjacent to the two-stage relay gears on the outer side of the inner support ring, respectively, and stops the rotation of the two-stage relay gears between the teeth of the two-stage relay gears after the forward sliding of the two-stage relay gears. The forward drive converter for bicycle, characterized in that consisting of a pin.