KR20040045646A - Apparatus for changing speed of bicycles - Google Patents

Abstract

PURPOSE: A speed changing device of a bicycle is provided to change speed easily without vibration or noise reducing weight and cost. CONSTITUTION: A hub shaft(100) is installed in a rear wheel of a bicycle. A hub shell(200) is provided to surround the hub shaft. A driven sprocket(300) is installed to the hub shaft driven by a driving sprocket. A transmission portion(400) comprises a transmitting portion(410) attached to the driven sprocket, a carrier(420) having more than two pawl connected to ratchets of the driven sprocket, a two-step planet gear(430) connected to the carrier having middle and high speed gears, a planet pawl installed between the planet gears, a first sun gear connected to the middle speed gear and a second gear connected to the high speed gear. A transmission controller(500) is further provided.

Description

Apparatus for changing speed of bicycles}

The present invention relates to a speed conversion device of a bicycle, and in particular, by forming a planetary gear in the hub of the rear wheel to convert the speed by the gear ratio, and control the gear ratio of the planetary gear by controlling the sun gear in the hub axis and the outer peripheral surface By shifting by shifting, a control unit for shifting is configured inside the hub, and a structure is provided by coupling of a pole in power transmission of a carrier and a driving unit.

Thus, the appearance is beautiful and the speed change operation is easy, the effect occurs immediately when the speed change operation occurs, no noise or vibration occurs during the speed change operation, occupies a small volume, and the speed is limited in a state where the total size of the hub is limited. It is possible to extend the ratio and reduce the overall weight and cost.

In addition, the control unit for shifting is contaminated and prevents easy corrosion, thereby reducing the noise caused by the ratchet gear, and to prevent the impact of the user's foot when the user does not roll the pedal to the speed converter of the bicycle It is about.

In general, a bicycle is equipped with a speed converter, and in some cases, a speed converter is also installed in a wheelchair and a toy car using a pedal.

Recently, gears having various diameters are formed on the shafts of the front and rear wheels, and in addition to the general speed converter which converts speed by changing the position of the power-carrying chain between these gears, An installed speed converter has been developed and used. The small gears are arranged in the hub shell to convert the speed by the gear completion ratio.

An example of the speed conversion device for an internal gear type bicycle as described above includes a domestic patent application 2000-66916 (priority claim application of 1999-57970) by the present applicant.

1 is a cross-sectional view showing a speed conversion device of a conventional bicycle, Figure 2 is a cross-sectional view taken along the line a-a 'of Figure 1, the configuration of the application by the present applicant is large, of the drive sprocket that rotates by the pedal of the bicycle Among the outputs of the driven sprocket 10 which receives power, the multi-speed transmission part 20 which receives the power of this driven sprocket 10, and changes a speed by gear tooth ratio, and the output of the multi-speed transmission 20. The shift output unit 30 selectively outputs only the quick side to the hub of the bicycle, and finally, the shift control unit 40 controlling the shift of the bicycle by controlling the sun gear 23 of the multi-stage transmission unit 20. do.

The multi-stage transmission part 20 is coupled to each stage of the carrier 21, one side is attached to the driven sprocket 10 and the other side is provided with two or more multi-stage planetary gear 22, It consists of a sun gear 23 having a ratchet tooth formed on the inner circumferential surface and a ring gear 24 meshing with the outer side of the multi-stage planetary gear 22, so that the speed change is dependent on the restraint state of the sun gear 23. Get up.

That is, in the embodiment in which the multi-stage planetary gear 22 is composed of two stages, the sun gear 23 is composed of two, and when the sun gear 23 is not restrained, the driven sprocket 10 and Rotation of the carrier 21 attached thereto causes the multi-stage planetary gear 22 to rotate, but the multi-stage planetary gear 22 is idling without any restraining force, and the rotational force is the clutch means of the shift output unit 30. The hub 31 is output to the hub 32.

However, when the sun gear 23 is fixed by the operation of the shift control unit 40, the multi-stage planetary gear 22 rotates on the fixed sun gear 23 to increase the speed. will be. In general, when the number of teeth of the multi-stage planetary gear 22 is fixed to the sun gear 23 of the smaller side, it is further increased.

The clutch means 31 of the shift output unit 30 includes a clutch ring 31a having a pin group formed at a predetermined interval, and a bearing seat portion 21a formed on the outer circumferential surfaces of the carrier 21 and the ring gear 24. The pin group is positioned in the bearing seat portion 21a by the relative positional shift of the clutch ring 31a, and is integrally rotated. In some cases, the ratchet is connected to the carrier 21 and the ring gear 24. Cogs and ratchet poles are also used.

In addition, the shift control unit 40 includes two poles 41 and 42 for rotating or fixing the two sun gears 23 and the poles 41 and 42 by operation of the conversion disk 43. And a pole control ring 44 for controlling the position.

However, the speed conversion device of the conventional bicycle as described above has the disadvantage that the overall weight and volume of the component is complicated, which may cause problems in the overall durability, and to recover the conversion disk The spring is located on the outside of the hub, which can be easily contaminated and corrosive, which can be a problem for durability.

In addition, since the carrier is directly fixed to the driven sprocket is installed, since the rotational force of the components in the hub shell is directly connected to the drive sprocket along the driven sprocket, when the occupant of the bicycle stops driving the drive sprocket, Since the driven sprocket and its components connected to the drive sprocket continue to rotate, there is a problem in that the impact on the occupant.

The present invention is to solve the above drawbacks, by forming a planetary gear in the hub of the rear wheel to change the speed by the gear ratio, by controlling the sun gear on the hub axis and the outer peripheral surface to adjust the gear ratio of the planetary gear In the speed changer of the bicycle for shifting, the appearance is beautiful and the operation of the speed change is easy, the effect occurs immediately during the speed change operation, no noise or vibration occurs during the speed change, occupies a small volume, It is possible to expand the speed ratio in a state where the total size of the hub is limited, to reduce the overall weight and cost, and also to prevent the control unit for shifting from being contaminated and thereby easily corroded, and by the ratchet gear Reduces noise and prevents shock from hitting your foot when you are not rolling on the pedals. To provide a speed converter.

The present invention and the hub shaft is installed on the rear wheel of the bicycle; A hub shell which forms a predetermined space and surrounds the hub shaft and has a ring gear and a ratchet groove formed therein; A driven sprocket installed on the hub shaft and receiving power from a drive sprocket; A transmission part having one side attached to the driven sprocket and receiving power and having a ratchet formed along an inner circumference thereof; At least two poles coupled to the ratchet of the transfer unit on one side of the carrier and engaged only in one direction with the transfer unit; At least one or more installed on the other side of the carrier by the pin, the middle speed and the high speed gear is formed, an extension part is formed therebetween, and one side of the gear of the middle speed gear is engaged with the ring gear of the hub shell. Two-stage planetary gears; A planetary pole installed between the two planetary gears on the other side of the carrier and caught in one direction by a ratchet groove of the hub shell; A first sun gear having an outer gear portion engaged with the other side of the middle speed portion of the two-speed planetary gear, extending from the gear portion, having a larger inner diameter than the gear portion, and having a one-way locking groove formed at the inner circumference thereof; A transmission portion formed of a second sun gear including an outer gear portion engaged with a high speed portion of the two-speed planetary gear, extending from the gear portion, having an inner diameter greater than that of the gear portion, and a locking portion having a one-way locking groove formed at the inner circumference; ; A first pole installed in a pole seat formed on the hub shaft, the first pole being engaged or released by a locking groove of an inner circumference of the first sun gear; A second pole which is caught or released by the locking groove of the inner circumference of the second sun gear; A pole control ring for controlling positions of the first pole and the second pole; A conversion disk having a groove for winding a wire on an outer circumferential surface and a hook portion formed on one side of the outer circumferential surface to rotate a predetermined angle by pulling the wire to change the position of the pole control ring through a connection portion; It is achieved by including a shift control section made up of a spring located inside the transfer section to return the position of the conversion disk.

1 is a cross-sectional view showing a speed conversion device of a conventional bicycle,

2 is a cross-sectional view taken along line a-a 'of FIG.

3 is a cross-sectional view showing a speed conversion device of the bicycle of the present invention;

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a cross-sectional view taken along the line B-B of FIG.

6 illustrates an embodiment in which a pump device is configured in a speed conversion device of a bicycle according to the present invention.

Indicating section,

7 to 9 are each at the speed stage of the speed conversion device of the bicycle of the present invention

Schematic sectional drawing which shows the latching state of a 1st pole and a 2nd pole.

<Explanation of symbols for the main parts of the drawings>

100: hub shaft 110: pole seat

200: hub shell 210: ring gear

220: ratchet groove 300: driven sprocket

400: transmission portion 410: transmission portion

420: carrier 430: two-stage planetary gear

440: meteor pole 450: first sun gear

460: second sun gear 500: shift control unit

510: first pole 520: second pole

530: pole control ring 540: conversion disk

550: connection 560: spring

600: Pump device

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing a speed converter of the bicycle of the present invention, Figure 4 is a cross-sectional view taken along the line A-A of Figure 3, Figure 5 is a cross-sectional view taken along the line B-B of Figure 3, the present invention is largely in the rear wheel Hub shaft 100 is installed; A hub shell 200 formed to form a predetermined space and surrounding the hub shaft 100 and having a ring gear 210 and a ratchet groove 220 formed therein; A driven sprocket 300 installed on the hub shaft 100 and receiving power from a driving sprocket (not shown); A transmission unit 400 that receives power from the driven sprocket 300 and converts speed by a gear ratio; Technical features of the shift control unit 500 for controlling the speed stage of the transmission unit 400.

The transmission unit 400 is in detail, one side is attached to the driven sprocket 300 receives the power transmission and the ratchet 411 is formed along the inner periphery; At least two poles 421 coupled to the ratchet 411 of the transfer unit 410 on one side thereof are installed on an outer circumference thereof, the carrier 420 engaging only one direction with the transfer unit 410; The other side of the carrier 420 is installed by the pin 431, a gear of the middle speed portion 432 and the high speed portion 433 is formed, an extension portion 434 is formed therebetween, the middle speed portion ( At least one two-stage planetary gear 430 installed at one side of the gear of 432 to be engaged with the ring gear 210 of the hub shell 200; A planetary pole 440 installed between the two planetary gears 430 on the other side of the carrier 420 and caught in one direction by the ratchet groove 220 of the hub shell 200; The outer gear portion 451 meshes with the other side of the middle speed portion 432 of the two-stage planetary gear 430, and extends from the gear portion 451, and has an inner diameter larger than that of the gear portion 451. A first sun gear 450 comprising a locking portion 453 in which a one-way locking groove 452 is formed in the main portion; The outer gear portion 461 is engaged with the high speed portion 433 of the two-stage planetary gear 430, extends from the gear portion 461, and has an inner diameter larger than that of the gear portion 461, and is caught in one direction on the inner circumference portion. It consists of a second sun gear 460 consisting of a locking portion 463 is formed with a groove 462.

That is, the driving force of the driven sprocket 300 is not transmitted to the carrier 420 as it is, but the transmission unit 410 is configured therebetween, by combining the ratchet 411 and the pawl 421 in one direction (pedal). Drive direction).

However, in addition to the ratchet 411 and the pawl 421, a variety of one-way clutch means such as a clutch ring and a pin group (refer to the prior art) to be coupled in one direction may be used.

In addition, the shift control unit 500 is installed on the pole seat 110 (see FIG. 7) formed in the hub shaft 100, and the locking groove 452 of the inner circumference of the first sun gear 450. A first pole 510 that is caught or released; A second pole 520 that is engaged or released by the locking groove 462 of the inner circumference of the second sun gear 460; A pole control ring (530) for controlling positions of the first pole (510) and the second pole (520); A groove for winding a wire (not shown) is formed on an outer circumferential surface, and a hook portion 541 is formed on one side of the outer circumferential surface to rotate a predetermined angle by pulling the wire, thereby positioning the pole control ring 530 through the connection portion 550. A conversion disk 540 for converting; The conversion disk 540 returns to a position and is configured in detail with a spring 560 positioned inside the transmission part 410 of the transmission part 400.

The predetermined space inside the hub shell 200 may be formed so that the shifting unit 400 and the shifting control unit 500 are densely installed, but in some cases, the space C of one side of the hub shell 200 may be secured. Other additional components may be installed for convenience.

That is, as an example, as shown in FIG. 6, a pumping device is formed on one side of the hub shell 200 and is installed on the hub shaft 100 to supply air of a bicycle tire. 600 may be further configured in the mounting groove 230.

The pump device 600 is a device that can additionally supply the air of the tire of the bicycle using the rotational force of the hub shaft 100, is installed eccentrically to the hub shaft 100, the rotation of the hub shaft 100 An eccentric portion 610 for generating a reciprocating motion according to the present invention; A piston 620 connected to the eccentric portion 610 and compressing air and forming an outlet; A nozzle unit 630 having one side connected to the outlet of the piston 620 and the other side connected to the inside of the tire to supply air; The housing 640 is mounted to the mounting groove 230 to fix the position of the piston 620.

That is, by operating the piston 620 by switching the rotational movement of the hub shaft 100 to the reciprocating motion, to refill the air leaking from the tire, or to adjust the air pressure in the tire.

On the other hand, as shown in Figure 3, by installing so that the engaging portion 453 of the first sun gear 450 is located in the extension portion 434 of the two-stage planetary gear 430, the components are efficient in a narrow space By being arranged in, it is possible to reduce the volume of the whole.

7 to 9 are schematic cross-sectional views showing the locking state of the first pole and the second pole at each speed stage of the speed converter of the bicycle according to the present invention, respectively, with reference to FIGS. 3 to 9. And the effect is as follows.

In the speed conversion apparatus of the bicycle of the present invention, the speed change unit 400 operates under the control of the speed change control unit 500 to enable speed control in three stages of a low speed stage, a middle speed stage, and a high speed stage.

First, in the low speed stage, as shown in FIG. 7, the first sun gear 450 and the second sun gear 460 are free states not caught by the first pole 510 and the second pole 520. When the driven sprocket 300 is rotated by the driving of the pedal, the transmission part 410 attached thereto rotates together, and the rotational force is a pole installed in the ratchet 411 and the carrier 420 of the transmission part 410. The combination of the 421, the carrier 420 is rotated together, the two-stage planetary gear 430 and the planetary pole 440 installed on the carrier 420 is rotated together.

In this state, since the first sun gear 450 and the second sun gear 460 are in a free state, the two-stage planetary gear 430 may also freely revolve around the hub shaft 100 in a free state. As the pawl 440 is caught by the ratchet groove 220 formed in the hub shell 200, the driving force is transmitted to the hub shell 200 to drive the bicycle.

In the intermediate speed stage, the shift control unit 500 is positioned as shown in FIG. 8. That is, when the user pulls the lever (not shown), the wire connected to the lever is pulled, and the conversion disk 450 connected thereto is rotated at an angle.

When the conversion disk 540 is rotated, the connection portion 550 coupled to the conversion disk 540 is rotated together, so that the pole control ring 530 connected to the connection portion 550 is rotated by a predetermined angle. The position of the first pole 510 is projected outward to engage with the locking groove 452 formed in the locking portion 453 of the first sun gear 450 located on the pole control ring 530 side.

When the driven sprocket 300 is rotated in the coupling relationship as described above, the carrier 420 is simultaneously rotated by the coupling of the transmission unit 410, and the two-stage planetary gear 430 installed in the carrier 420 rotates together. In this case, the intermediate speed portion 432 of the two-stage planetary gear 430 is engaged with the first sun gear 450 fixed by the first pole 510 to generate a rotational force.

The rotational speed at which the two-stage planetary gear 430 is engaged with the first sun gear 450 and rotates is greater than the rotational speed of the carrier 420, and the speed increases by approximately 1.5.

Therefore, the rotation of the ring gear 210 through the two-stage planetary gear 430 is faster than the rotation speed of the carrier 420, so in this case the planetary pole 440 does not work and the ring instead of slipping occurs The rotational force through the gear 210 is transmitted to the hub shell 200.

On the other hand, in the high speed state, the shift control unit 500 is positioned as shown in FIG. That is, when the user pulls the lever (not shown) once more in the medium speed state, the wire connected to the lever is pulled, and the conversion disk 540 connected thereto is further rotated by a predetermined angle.

When the conversion disk 540 is rotated, as in the case of the medium speed, the connection portion 550 coupled to the conversion disk 540 is rotated together, so that the pole control ring 530 connected to the connection portion 550 is Rotated by a certain angle, the first pole 510 is moved slightly inward to release the coupling with the first sun gear 450, the position of the second pole 520 is projected outward to control the pole The engaging groove 462 is formed in the locking portion 463 of the second sun gear 460 located on the ring 530 side.

When the driven sprocket 300 rotates in the coupling relationship as described above, the carrier 420 rotates at the same time, and the two-stage planetary gear 430 installed in the carrier 420 rotates together, but the two-stage planetary gear ( The high speed portion 433 of 430 meshes with the second sun gear 460 fixed by the second pole 520 to generate rotational force.

The rotational speed at which the two-stage planetary gear 430 is rotated in engagement with the second sun gear 460 is larger than that of the intermediate speed stage, and is larger than the rotational speed of the carrier 420, and is about the lower speed stage. There is a twofold increase in speed.

In this case, as in the case of the middle speed stage, the rotation of the ring gear 210 through the two-stage planetary gear 430 is faster than the rotation speed of the carrier 420, so that the planetary pole 440 and the ratchet groove Coupling with the 220 does not occur and the sliding occurs, the rotational force through the ring gear 220 transmitted through the high speed portion 433 of the two-stage planetary gear 430 is to be transmitted to the hub shell 200. .

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the scope of the present invention is not limited to the above drawings and embodiments.

The present invention as described above constitutes a planetary gear in the hub of the rear wheel to convert the speed by the gear ratio, by controlling the sun gear on the hub shaft and its outer peripheral surface to adjust the gear ratio of the planetary gear to shift speed In the converting device, the appearance is beautiful and the speed change operation is easy, the effect occurs immediately during the speed change operation, no noise or vibration occurs during the speed change operation, takes up a small volume, and the total size of the hub is limited. It is possible to expand the speed ratio in the state, reduce the overall weight and cost, and also prevent the control unit for the shifting from being contaminated, thereby easily corroded, reducing the noise by the ratchet gear, Is an invention that has the effect of preventing the impact of the user's feet when the pedal is not rolling.

Claims (3)

A hub shaft installed at the rear wheel of the bicycle; A hub shell which forms a predetermined space and surrounds the hub shaft and has a ring gear and a ratchet groove formed therein; A driven sprocket installed on the hub shaft and receiving power from a drive sprocket; A transmission part having one side attached to the driven sprocket and receiving power and having a ratchet formed along an inner circumference thereof; At least two poles coupled to the ratchet of the transfer unit on one side of the carrier and engaged only in one direction with the transfer unit; At least one or more installed on the other side of the carrier by the pin, the middle speed and the high speed gear is formed, an extension part is formed therebetween, and one side of the gear of the middle speed gear is engaged with the ring gear of the hub shell. Two-stage planetary gears; A planetary pole installed between the two planetary gears on the other side of the carrier and caught in one direction by a ratchet groove of the hub shell; A first sun gear having an outer gear portion engaged with the other side of the middle speed portion of the two-speed planetary gear, extending from the gear portion, having a larger inner diameter than the gear portion, and having a one-way locking groove formed at the inner circumferential portion; A transmission portion formed of a second sun gear including an outer gear portion engaged with a high speed portion of the two-speed planetary gear, extending from the gear portion, having an inner diameter greater than that of the gear portion, and a locking portion having a one-way locking groove formed at the inner circumference; ; A first pole installed in a pole seat formed on the hub shaft, the first pole being engaged or released by a locking groove of an inner circumference of the first sun gear; A second pole which is caught or released by the locking groove of the inner circumference of the second sun gear; A pole control ring for controlling positions of the first pole and the second pole; A conversion disk having a groove for winding a wire on an outer circumferential surface and a hook portion formed on one side of the outer circumferential surface to rotate a predetermined angle by pulling the wire to change the position of the pole control ring through a connection portion; And a shift control unit formed of a spring located within the transfer unit to return the position of the conversion disk. The speed conversion device for a bicycle according to claim 1, wherein the engaging portion of the first sun gear is positioned at an extension of the two-stage planetary gear. In a speed converter which is installed in the rear hub of a bicycle and receives a driving force through a driven sprocket, and converts the driving force by using a carrier and a transmission, By dividing the rotational force of the driven sprocket and the carrier by using one-way clutch means, When the bicycle is running without pedaling the bicycle, the rotational force of the hub is transmitted to the driven sprocket to decelerate rotation, but the power conversion device characterized in that the power is not transmitted to the carrier.