KR200287136Y1 - Gear transmission device of bicycle - Google Patents

Abstract

The present invention relates to a gear transmission of a bicycle, and more particularly, to simplify the structure and to make the internal parts not deformed by the action of a torsional force such as to simplify the structure, thereby ensuring the accuracy and durability of the gear shifting operation. Regarding the gear transmission of the bicycle to be able to, which is formed on the pedal shaft 200 in the gear box 100, a plurality of motive gears (200A) are sequentially formed for each tooth size, parallel to the pedal shaft (200) A plurality of driven gears (300A) are sequentially formed in the reverse order with the prime mover (200A) of the pedal shaft (200A) on the transmission shaft (300) formed at intervals, the rotational force of the prime mover (200A) is a power interruption In the configuration configured to be transmitted to the transmission shaft 300 by the unit (1) or cut off, the power control unit (1) is a transmission shaft (300A) having a driving groove (2) in the center of one side of the transmission shaft ( On bearing (3) Is engaged with the motive gear 200A in a rotatably supported state, and the inner surface of the actuating groove 2 is partitioned into an inner tooth 4 and an outer slide 5 so that the transmission shaft 300 is rotated. And the electric gear 7 provided to be movable in the axial direction on the transmission shaft 300 while being interlocked with the toothed portion 4 of the operating groove 2 is located on the slide part 5. It is possible to solve the torsion and deformation of the guide shaft due to the power transmission of the motive gear and the driven gear while the electric gear moves along the guide shaft. There is an effect that can ensure the accuracy of the gear shift operation and the continuity of its function.

In addition, the structure of the intermediate medium as described above can be eliminated, thereby simplifying the structure, which also has the advantage of reducing the manufacturing cost.

Description

Gear transmission device of bicycle

The present invention relates to a gear transmission of a bicycle, and more particularly, to simplify the structure and to make the internal parts not deformed by the action of a torsional force such as to simplify the structure, thereby ensuring the accuracy and durability of the gear shifting operation. It relates to a gear shift of a bicycle.

In general, a bicycle is equipped with a gear shift so that the bicycle can be driven by a pedal operation with less force when driving on hills or sloped lands. This is typically a plurality of gears having different tooth sizes on the pedal and the rear wheel. That is, the sprocket is provided in such a way that it is configured to be interlocked by the chain.

However, the gear shifting device of the conventional bicycle is exposed to the outside, so that the risk of physical contact is not only multiplied but also causes a poor appearance. In addition, the sum of the gears formed on the pedal shaft and the gears formed on the rear wheel side are not equal to each other. Therefore, the gear shift stage is lost due to the overlapping shift during gear shifting. The gear shifting step was made to fall short of the gear shifting step of the bicycle promoted by the company, resulting in uncertainty in the gear shifting.

In more detail, assuming that, for example, three gears with different number of teeth on the pedal shaft are mounted, that is, sprockets, and eight gears with different number of teeth on the rear wheel shaft are also installed. It is promoted by the company that the gear shift of 24 stages can be made by 8 = 24. However, this is due to the overlap shift, that is, 3 to 8, 8 to 3, or 2 to 5, 5 and 2, so that the actual gear shift step is far short of the gear shift stage promoted by the company. Will occur.

In this regard, the present applicant has proposed the patent application 2001-17229 "the gear transmission of the bicycle" in order to solve the conventional problems as described above,

5 is a view showing a conventional bicycle to which a gear transmission of a conventional bicycle is applied, and this bicycle has a front wheel 120 and a rear wheel 130 formed on the front and rear sides of the frame 110 as usual, and the front wheel A pedal 140 is formed between the 120 and the rear wheel 130, and a gearbox 100 of a gear shift device of a conventional bicycle is installed on a rotation shaft of the pedal 140.

In addition, the gear transmission of the bicycle, as shown in FIG. 6, a plurality of motive gears 200A are sequentially formed for each tooth size on the pedal shaft 200 inside the gearbox 100, and the pedal shaft 200 A sprocket (not shown) is formed at an end side of the transmission shaft 300 which is formed at intervals in parallel with the plurality of driven gears, and a plurality of driven gears 300A on the transmission shaft 300 are driven gears of the pedal shaft 200. The driving gear 200A and the driven gear having a somewhat moving width while being moved along the guide shaft 402 by the pulling force of the first wire 401 are sequentially formed in the reverse order with 200A. An electric gear 403 for interconnecting 300A is provided. At this time, the pedal shaft 200 and the electric shaft 300 is configured to be movable in a manner that is opened to both sides again by the operation of a separate shaft moving unit (not shown), the electric gear 403 is a pedal shaft After the 200 and the electric shaft 300 is moved along the guide shaft 402 in a state that is open to both sides, the pedal shaft 200 and the electric shaft 300 is configured to be engaged with each other in the corresponding gear by the original position It is.

However, in the conventional gear transmission of the bicycle, when the electric gear is located at both ends of the guide shaft, there is no torsion on the guide shaft so that the deformation of the guide shaft does not occur, but the electric gear is located in the middle of the guide shaft. There is a problem in that the torsion is largely applied to the guide shaft to cause deformation of the guide shaft, resulting in a lack of accuracy and loss of function of the gear shift due to the movement of the electric gear.

In addition, due to the complexity of the structure is difficult to produce and there was a problem causing a cost increase.

Therefore, the present invention was devised to solve the conventional problems as described above, and its purpose is easy to manufacture due to the simplification of the structure, and the gear shifting operation is configured so that internal parts are not deformed by the action of a torsional force. To ensure accuracy and continuity.

In order to achieve the object of the present invention, a plurality of motive gears are sequentially formed on the pedal shaft of the gearbox by the number of teeth, and a plurality of driven gears on the transmission shaft are formed at intervals parallel to the pedal shaft. The driving gear is sequentially formed in the reverse order, and the rotational force of the driving gear is configured to be transmitted to or shut off by the power control unit, wherein the power control unit has the driving groove at the center of one side of the drive shaft. It is meshed with the motive gear in a state rotatably supported by a bearing on the upper surface, the inner surface of the working groove is partitioned into the inner teeth and the outer slide portion is interlocked with the transmission shaft to move in the axial direction on the transmission shaft. The gear is provided by being engaged with or disengaged from the teeth of the working groove to be located on the slide There is provided a gear transmission of a bicycle, which is configured to allow power transmission and blocking.

In addition, the power control unit is provided with an inclined surface on the electric gear, the relative inclined surface corresponding to the inclined surface is provided at the tip and the movable bar is elastically supported by the return spring corresponding to each of the electric gear to advance the movable bar. By the sliding contact of the tip relative inclined surface of the movable bar to the inclined surface of the electric gear, the electric gear can be moved in the axial direction of the electric shaft, the electric gear is in the original position by the resilient spring is elastically installed in the working groove It characterized in that it comprises a gear moving unit configured to be returned to.

In addition, the gear moving unit is provided with a feed shaft in a direction perpendicular to each other with respect to the movable bar provided in correspondence with the electric gear, the eccentric cam is interlocked with the feed shaft, the eccentric cam is And a movable bar operating portion configured to be movable in the axial direction on the feed shaft so that the eccentric cam is moved to the corresponding movable bar position and rotated together with the feed shaft to perform the forward operation of the movable bar. do.

In addition, the power control unit is configured to sequentially form the primary gears on the pedal shaft spaced from each other by a spacer, the driven gear of the electric shaft is formed to be sequentially spaced apart from each other with the primary gear while interlocking with the electric shaft. It is configured to form an operating space therebetween, characterized in that the driven gear is engaged with the motive gear by the driven gear is moved to the operating space side characterized in that configured to transmit the rotational force of the motive gear to the transmission shaft.

In addition, the power control unit forms an inclined surface on the driven gear, and a movable bar having a relative inclined surface corresponding to the inclined surface is formed at the tip and elastically supported by the return spring corresponding to each of the driven gears to move forward of the movable bar. Thus, the driven gear is configured to be moved on the transmission shaft by sliding the contact surface of the tip of the movable bar to the inclined surface of the driven gear, and a plurality of stoppers corresponding to the driven gear are integrally formed on the transmission shaft. And a gear moving part configured to allow the driven gear to be returned to its original position by a restoring spring supported by the stopper while allowing the movement range of the driven gear to be limited by the stopper.

In addition, the gear moving portion is provided with a feed shaft in a direction perpendicular to each other with respect to the movable bar provided in correspondence with the driven gear, the eccentric cam is interlocked with the feed shaft on the feed shaft, the eccentric cam is And a movable bar operating portion configured to be movable in the axial direction on the feed shaft so that the eccentric cam is moved to the corresponding movable bar position and rotated together with the feed shaft to perform the forward operation of the movable bar. do.

1 is a cross-sectional view showing an embodiment configuration of the present invention.

2a and 2b is a view showing the main configuration and operating state of Figure 1,

Figure 2a is a cross-sectional view showing a state before operation.

Figure 2b is a sectional view showing an operating state.

Figure 3 is a cross-sectional view showing the configuration of another embodiment of the present invention.

4a and 4b are shown the main configuration and the operating state of Figure 3,

4A is a cross-sectional view showing a state before operation.

Figure 4b is a sectional view showing an operating state.

5 is a side view of a bicycle to which a gear transmission of a conventional bicycle is applied.

Figure 6 is a cross-sectional view showing a configuration of a gear transmission of a conventional bicycle.

* Explanation of symbols for the main parts of the drawings

1: power control section 2: working groove

3: Bearing 4: Teeth

5: slide

6: gear moving part

61: slope 62: movable bar

62A: Relative slope 62B: Return spring

63: Restoration spring

64: movable bar operating part

64A: Feed Axis 64B: Eccentric Cam

64C: Wire

11: Spacer 12: Operating space

13: Gear moving part

131: slope 132: movable bar

132A: Relative slope 132B: Return spring

133: stopper 134: restoring spring

135: movable bar operating part 135A: feed shaft

135B: Eccentric Cam 135C: Wire

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the present invention according to the embodiment.

1 is a cross-sectional view showing the configuration of an embodiment of the present invention, the gear transmission of the bicycle, as usual, both the pedal shaft 200 and the electric shaft 300 in the gearbox 100 in parallel to each other It is provided in a state rotatably supported by the bearing (3), one side end of the transmission shaft 300 of the transmission shaft 300 to the side of the sprocket 400 is also rotatably supported by the gear box 100 of the A driven gear 300A for transmitting rotational force is axially coupled, and the sprocket 400 is integrally formed with a driven gear 400A engaged with the driven gear 300A, and the sprocket 400 is driven by the driven gear 400A. ) Can be rotated.

In addition, the plurality of motive gears 200A having different numbers of teeth are successively arranged on the pedal shaft 200, and the number of teeth is sequentially arranged in a manner that gradually increases to one side, and on the transmission shaft 300, the motive gears ( The number of driven gears 300A is sequentially arranged in such a manner that the number of teeth is increased in the reverse order of 200A, and the driven gear 300A and the driven gear 200A are engaged with each other.

In the gear transmission of such a bicycle, the present invention is a means for allowing the rotational force of the prime mover (200A) to be selectively transmitted to the electric shaft (300) via the driven gear (300A) to the electric gear (7) A power control unit 1 is provided, and the power control unit 1 includes a gear moving unit including a movable bar 62 to move the electric gear 7 in the axial direction of the electric shaft 300. (6) is included, and the gear moving part (6) is configured to include a movable bar operating part (64) for moving the back and forth of the movable bar (62).

In more detail, the power control unit 1 may be rotatably supported by the bearing 3 on the transmission shaft 300 as shown in FIGS. 2A and 2B, respectively. Each driven gear 300A supported by the bearing 3 has an operating groove 2 formed at a central portion thereof, and is operated on one side of the transmission shaft 300 of the operating groove 2. Electric gears 7 each having a diameter corresponding to the grooves 2 are provided.

In addition, a tooth 4 is formed at an inner side of an operating groove 2 of the driven gear 300A, and a slide 5 is formed at an outer side of the driving gear 300A, so that the driving shaft 300 of the driven shaft 300 is shown in FIG. The driven gear 7 movably provided in the axial direction is inserted into the working groove 2 as shown in FIG. 2B and engaged with the teeth 4 of the working groove 2 so as to be driven by the driven gear. 300A is to receive the rotational force of the prime mover (200A) is to be transmitted to the electric shaft 300 through the electric gear (7), as shown in Figure 2a the electric gear (7) operating groove ( The driven gear 300A is idling with the rotational force of the driven gear 200A by being separated from the teeth 4 of 2) and being located on the outer slide 5 so that the driven gear 300A is driven by the driven gear 200A. Received the rotational force of the) to be transmitted to the electric shaft 300 through the electric gear 7 is cut off, the electric gear 7 is a spline groove 9 is formed inside the central hole is coupled to the transmission shaft 300 is formed with a plurality of splines 8 in the axial direction is possible to rotate together with the transmission shaft 300 It is also possible to move in the axial direction of the coaxial 300.

As shown in FIG. 1, the gear moving part 6 includes a plurality of movable bars 62 corresponding to the electric gear 7, and the movable bars 62 independently move forward and backward. The electric gear 7 can be moved in the axial direction on the electric shaft 300 by being moved forward and backward. To this end, as shown in FIGS. 2A and 2B, an inclined surface 61 is formed on one side of the electric gear 7 facing the movable bar 62, and a relative inclined surface (at the tip of the movable bar 62). 62A) is formed so that they can move the electric gear 7 in the axial direction of the electric shaft 300 by being in sliding contact with each other by the advancement of the movable bar 62, the movable bar 62 A resilient spring 63 is installed elastically in the actuating groove 2 of the driven gear 300A to support the retraction of the electric gear 7 at the same time. And, the movable bar 62 is configured to be elastically supported in the home position direction by the return spring (not shown).

As shown in FIG. 1, the movable bar operating part 64 is provided with a feed shaft 64A in a direction perpendicular to each other with respect to the movable bar 62 provided in correspondence with the electric gear 7. The eccentric cam 64B is provided on the feed shaft 64A, and the feed shaft 64A has a plurality of splines (not shown) formed on the outer side along the axial direction, and the axial hole of the eccentric cam 64B is provided. Spline grooves (not shown) are formed on the inner side so that the eccentric cam 64B can be rotated together with the feed shaft 64A while being movable in the axial direction of the feed shaft 64A by the combination thereof. .

And the movement of the eccentric cam (64B) is made possible by connecting the wire (64C) to the eccentric cam (64B) and the pulling force is applied to the wire (64C), which is not limited to this movement function The eccentric cam 64B is rotated by the feed shaft 64A after the eccentric cam 64B is positioned on the movable bar 62, and the eccentric cam 64B contacts the movable bar 62 in the forward direction. By pushing to the forward operation of the movable bar 62 is made.

Figure 3 shows another embodiment of the present invention, the gear transmission of the bicycle is a gear shaft 100, as usual, both the pedal shaft 200 and the electric shaft 300 in parallel to each other bearing ( 3) is rotatably supported, and one side end of the electric shaft 300 has a rotational force of the electric shaft 300 toward the sprocket 400 that is also rotatably supported by the gearbox 100. The driven gear 300A to be transmitted is axially coupled, and the sprocket 400 is integrally formed with the driven gear 400A meshed with the driven gear 300A so that the sprocket 400 is formed by the driven gear 400A. It is configured to be rotated.

In the gear transmission of such a bicycle, the present invention, as shown in Figure 3, the motive gear 200A on the pedal shaft 200 is sequentially arranged at intervals from each other by the spacer 11 and at the same time the pedal shaft 200 ), And the driven gear 300A on the transmission shaft 300 is configured to interlock with the transmission shaft 300, but is sequentially formed at intervals from each other to deviate from the driving gear 200A, thereby operating space therebetween. 12 is configured to be formed.

4A and 4B, a plurality of splines 14 are formed on the outer surface of the transmission shaft 300, and spline grooves 15 are formed in the shaft hole of the driven gear 300A to couple them. This allows the driven gear 300A to be rotated together while being movable in the axial direction on the transmission shaft 300.

Accordingly, the selected driven gear 300A is moved to the operating space portion 12 in which the corresponding prime gear 200A is located, and is engaged with the prime gear 200A so that the rotational force of the prime gear 200A is driven gear 300A. It is transmitted to the transmission shaft 300 through).

The driven gear 300A is moved by the gear moving part 13, and the gear moving part 13 is provided with a plurality of movable bars 132 corresponding to the driven gear 300A. The bar 132 is independently moved forward and backward, and is configured to be able to move the driven gear 300A in the axial direction on the transmission shaft 300 by being moved forward and backward.

To this end, an inclined surface 131 is formed on one side of the driven gear 300A opposite to the movable bar 62, and a relative inclined surface 132A is formed at the tip of the movable bar 132 so that the movable bar 132 is formed. The sliding gear 300A is moved by the forward movement of the driven gear 300A to move in the axial direction of the transmission shaft 300, that is, the working space 12 side, and the driven gear 300 on the transmission shaft 300. A plurality of stoppers 133 are integrally formed to correspond to 300A) so that the movement range of the driven gear 300A may be limited by the stoppers 133.

In addition, the restoring spring 134 is elastically installed between the stopper 133 and the driven gear (300A) is configured to allow the return of the driven gear (300A) by the restoring spring 134, the movable bar ( 132 is elastically supported by being able to be retracted by a return spring (not shown).

And as a means for moving the movable bar 132 forward and backward is provided with a movable bar operating unit 135, the movable bar operating unit 135 is provided with a plurality of movable bars corresponding to the driven gear (300A) ( The feed shaft 135A is provided in a direction perpendicular to each other with respect to 132, and the eccentric cam 135B is provided on the feed shaft 135A, and the feed shaft 135A has a plurality of splines on the outer surface thereof. (Not shown) are formed along the axial direction, and spline grooves (not shown) are formed inside the axial hole of the eccentric cam 135B to couple the eccentric cam 135B by the combination of the feed shaft 135A. It is configured to be rotatable with the feed shaft (135A) while being movable in the axial direction.

And the movement of the eccentric cam (135B) is made possible by connecting a wire (135C) to the eccentric cam (135B) to the pull force is applied to the wire (135C), which is not limited to this movement function If the eccentric cam 135B is positioned on the movable bar 132, the feed shaft 135A is rotated so that the eccentric cam 135B is in contact with the movable bar 132 in the forward direction. By pushing to the forward operation of the movable bar 132 is made.

As described above, the present invention is configured such that the power transmission of the motive gear and the driven gear is performed without an intermediate medium, and thus the torsion and the transfer of the power gear and the driven gear are performed while the electric gear moves along the guide shaft. Not only can the deformation of the guide shaft be eliminated, but it also has the effect of ensuring the accuracy of the gear shifting operation and the continuity of its function.

In addition, the structure of the intermediate medium as described above can be eliminated, thereby simplifying the structure, which also has the advantage of reducing the manufacturing cost.

Claims (6)

On the pedal shaft 200 in the gearbox 100, a plurality of motive gears 200A are sequentially formed for each tooth size, and on the transmission shaft 300 formed at intervals in parallel with the pedal shaft 200. A plurality of driven gear (300A) is formed in the reverse order with the prime mover (200A) of the pedal shaft 200, the rotational force of the prime mover (200A) is transmitted to the transmission shaft (300) by the power intermittent (1). Configured to be blocked or blocked, The power control unit 1 is a driving gear (200A) in a state in which the driven gear (300A) is rotatably supported by the bearing (3) on the transmission shaft 300 having an operating groove (2) in the center of one side And the inner surface of the working groove 2 is partitioned into the inner teeth 4 and the outer slide 5 so as to be interlocked with the transmission shaft 300 in the axial direction on the transmission shaft 300. It is characterized in that the electric transmission 7 is provided so as to be movable to the teeth (4) of the operating groove (2) to be engaged or separated so that the power transmission and blocking can be made by being located on the slide (5). Gear shift of a bicycle. The method of claim 1 wherein the power control unit (1), An inclined surface 61 is formed on the electric gear 7, and a relative inclined surface 62A corresponding to the inclined surface 61 is formed at the front end thereof, and the movable bar 62 is elastically supported by the return spring. And corresponding to 7) so that the tip relative inclined surface 62A of the movable bar 62 is in sliding contact with the inclined surface 61 of the electric gear 7 as the movable bar 62 moves forward. ) Is configured to be moved in the axial direction of the electric shaft 300, the toothed gear 7 is configured to be returned to its original position by the restoring spring (63) elastically installed in the working groove (2). Gear shift of the bicycle, characterized in that it comprises an eastern (6). The gear mover (6) according to claim 2, A feed shaft 64A is provided in a direction perpendicular to each other with respect to the movable bar 62 provided corresponding to the electric gear 7, and an eccentric cam interlocked with the feed shaft 64A on the feed shaft 64A. And 64B, the eccentric cam 64B is provided to be movable in the axial direction on the feed shaft 64A such that the eccentric cam 64B is moved to the corresponding movable bar 62 position to feed the feed shaft 64A. The gear transmission of the bicycle, characterized in that it comprises a movable bar operating portion (64) configured to be the forward operation of the movable bar (62) by being rotated with. The method of claim 1 wherein the power control unit (1), The primary gear 200A on the pedal shaft 200 is configured to be sequentially formed by the spacer 11 at intervals, and the driven gear 300A of the transmission shaft 300 is interlocked with the transmission shaft 300. The driving gear 200A is formed to be sequentially spaced apart from each other by the driving gear 200A, and the working space 12 is formed therebetween, and the driven gear 300A is moved by the driven gear 300A toward the working space 12 side. The gear transmission of the bicycle, characterized in that configured to be transmitted to the motor shaft 300, 300A) is meshed with the motive gear (200A). According to claim 4, The power control unit (1), An inclined surface 131 is formed on the driven gear 300A, and a relative inclined surface 132A corresponding to the inclined surface 131 is formed at the front end thereof, and a movable bar 132 is elastically supported by the return spring. 300A) corresponding to the driven gear (300A) by sliding the contact relative to the inclined surface 131 of the driven gear (300A) of the tip relative inclined surface (132A) of the movable bar (132) in advance of the movable bar (132) ) Is configured to be moved on the transmission shaft 300, a plurality of stoppers 133 corresponding to the driven gear (300A) integrally formed on the transmission shaft 300, driven by the stopper 133 The gear moving part 13 configured to return the driven gear 300A to its original position by the restoring spring 134 supported by the stopper 133 while allowing the movement range of the gear 300A to be limited. Gear shifting device of the bicycle comprising a. According to claim 5, The gear moving part 13, A feed shaft 135A is provided in a direction orthogonal to the movable bar 132 provided correspondingly to the driven gear 300A, and an eccentric cam 135B interlocked with the feed shaft 135A on the feed shaft 135A. Wherein, the eccentric cam (135B) is provided to be movable in the axial direction on the feed shaft (135A) is the eccentric cam (135B) is moved to the movable bar 132 position to rotate with the feed shaft (135A) The gear transmission of the bicycle, characterized in that it comprises a movable bar operating unit 135 is configured to be the forward operation of the movable bar 132 by being.