KR101556577B1 - System for changing speed for bicycle, derailleur for the same and Method for controlling the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission of a bicycle, and more particularly to a transmission system of a bicycle, a chain transmission and a control method thereof. The present invention provides a bicycle comprising: a chain transmission for transmitting a position of a driving chain of a bicycle; A shift switch for generating a transmission signal of the chain transmission; A signal distributor for transmitting a drive signal between the chain transmission and the shift switch; A battery for driving the chain transmission; And a GPS capable of receiving satellite signals; A control unit for driving the chain transmission in an automatic mode for driving the chain transmission in a manual mode for driving the chain transmission by the operation of the shift switch or for sensing the inclination angle of the ground from the GPS and driving the chain transmission in a set gear ratio range according to the inclination angle, As shown in FIG.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle transmission system, a chain transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission of a bicycle, and more particularly to a transmission system of a bicycle, a chain transmission and a control method thereof.

Currently, there are more and more people in our country who use recreational bicycles as well as leisure bikes that can run mountainous as well as four major rivers.

The driving device used in such a bicycle is generally constituted by a chain ring fixedly mounted on the pedal shaft of the bicycle and a chain transmitting power between the sprocket fixedly mounted on the rear wheel shaft of the bicycle.

At this time, the chainring and the sprocket may each include gears of various sizes having one or more gear ratios. Thus, the bicycle can be shifted by adjusting the position of the chain engaged with the one or more chainrings and the sprocket.

The adjustment of the position of the chain can be accomplished through a chain transmission, also known as a derailleur.

The speed change device of such a bicycle can be largely composed of a shift lever mounted on a handle of a bicycle and a chain transmission that is controlled by the operation of the shift lever.

However, in such a chain transmission, an operation is performed by operation of a shift lever mounted on a handle of a bicycle in order to secure an accurate displacement position.

That is, the shift operation is performed by the shift switch using the shift lever to drive the chain transmission.

Fig. 1 is a schematic diagram showing an example of such a chain transmission, which shows a rear transmission provided on a rear wheel shaft.

This rear transmission 2 can change the position of the gear plate of the sprocket 1 to which the chain is attached by adjusting the position of the pulley 3 that rotates in engagement with the chain.

By the way, the rear transmission 2 is connected to the shift switch by a wire, and the shift switch can drive the rear transmission 2 by changing the tension of the wire.

In addition, such a shift switch has a very complicated structure including many parts.

The rear transmission 2 driven by the shift switch is mounted on the outside of the sprocket 1 in order to avoid interference with the rear wheels. The rear transmission 2 is driven by the tension of the wire, Position.

The rear derailleur 2 protruded in this way has a disadvantage in that it is vulnerable to an external shock. For example, when the bicycle is laid down in the direction of the rear derailleur 2, such a rear derailleur 2 may be damaged.

In addition, the trimming process of this transmission requires a very complicated process, such as adjusting the tension of the wire finely and adjusting the feed range of the rear transmission 2.

Furthermore, the wire may be stretched while the bicycle is being used, and the setting of the transmission may be interrupted due to an impact applied to the bicycle, so that there is a high possibility that a shift trouble in which shifting is not performed smoothly occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmission system, a chain transmission, and a control method thereof for a bicycle in which the shifting of the bicycle is fast and accurate and the possibility of occurrence of shift troubles is reduced.

It is another object of the present invention to provide a transmission system, a chain transmission, and a control method of a bicycle which can automatically perform a shift according to a situation without operating a shift lever.

According to a first aspect of the present invention, there is provided a bicycle comprising: a chain transmission for transmitting a position of a drive chain of a bicycle; A shift switch for generating a transmission signal of the chain transmission; A signal distributor for transmitting a drive signal between the chain transmission and the shift switch; A battery for driving the chain transmission; And a GPS capable of receiving satellite signals; A control unit for driving the chain transmission in an automatic mode for driving the chain transmission in a manual mode for driving the chain transmission by the operation of the shift switch or for sensing the inclination angle of the ground from the GPS and driving the chain transmission in a set gear ratio range according to the inclination angle, As shown in FIG.

Here, it may further include a changeover switch for switching between the manual mode and the automatic mode.

Here, the chain transmission includes: a front transmission that changes the position of the chain hooked on at least one chain ring connected to a pedal axis of the bicycle; And a rear transmission for changing the position of the chain which is engaged with one of at least one or more sprockets connected to the rear wheel axle of the bicycle.

Here, the chain transmission includes: a slide for transferring a chain so that the chain is engaged to at least one or more chainrings connected to a pedal axis of the bicycle or at least one or more sprockets connected to a rear wheel axis of the bicycle; A slide shaft to which the slide is fed; A motor for transferring the slide through the slide shaft; And a motor control unit connected to the control unit and driving the motor under the control of the control unit.

The control unit may further include a torque sensing unit for sensing a change in a torque or a torque of the pedal shaft of the bicycle.

At this time, the automatic mode may drive the chain transmission at a set gear ratio range according to the inclination angle of the ground detected from the GPS and the change amount of torque or torque of the pedal shaft.

According to a second aspect of the present invention, there is provided a bicycle comprising: at least one chain ring connected to a pedal axis of a bicycle; at least one sprocket connected to a rear wheel axis of the bicycle; ; A slide shaft to which the slide is fed; A motor for transferring the slide through the slide shaft; A motor controller for sensing the tilt angle of the ground from the GPS and driving the motor according to the tilt angle; And a battery for supplying power to the motor and the motor control unit.

Here, the motor control unit may drive the motor to transfer the chain to a gear ratio set according to the inclination angle.

Here, the motor and the motor control unit may be provided outside the sprocket or the chainring.

According to a third aspect of the present invention, there is provided a bicycle comprising: at least one chain ring connected to a pedal shaft of a bicycle or a chain transmission for controlling the position of a chain engaged with at least one sprocket connected to a rear wheel axis of the bicycle; The method comprising: receiving a satellite signal from a GPS; Reading an inclination of a point at which the bicycle is located from the satellite signal; And controlling the chain transmission so that the chain is positioned within a predetermined gear ratio range according to the inclination.

The method may further include detecting a change in torque or torque of the pedal shaft.

At this time, the chain transmission can be driven in the gear ratio range set according to the read inclination and the change amount of the torque or torque.

The present invention has the following effects.

First, the electric transmission system according to the present invention is fast in shifting and enables precise shifting. Also, there is no need to trim the chain transmission.

In other words, it is not necessary to finely adjust the position of the front derailleur or the rear derailleur manually. In addition, there is little concern about waterproofing and cable contamination.

On the other hand, in the operation of the shift switch, shifting of the bicycle can be performed only by lightly pressing operation, and fatigue of the passenger's fingers can be reduced.

In addition, since the vehicle has the appropriate gear ratio adjusting function set, there is no shift trouble and therefore the ride feeling can be improved.

The passengers of the bicycle can choose between automatic mode and manual mode, so that the bicycle can be operated in various ways depending on the passenger's taste and mood.

1 is a schematic view showing an example of such a chain transmission.
2 is a block diagram showing an example of a shift system of the present invention.
3 is a schematic view showing an example of a bicycle equipped with the shift system of the present invention.
4 is a schematic view showing an example of a front derailleur and a rear derailleur as a chain transmission.
5 is a schematic diagram showing an example of an optimum gear ratio setting.
6 is a schematic diagram showing an example of the configuration of the rear transmission.
7 is a schematic view showing an example of the installation state of the rear transmission.
8 is a perspective view showing an example of a shift switch.
9 and 10 are flowcharts showing a method of shifting a bicycle using a shift system of a bicycle.

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

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

Fig. 2 is a block diagram showing an example of a shift system of the present invention, and Fig. 3 is a schematic diagram showing an example of a bicycle equipped with the shift system of the present invention.

2 and 3, the transmission system of the bicycle includes a drive chain (not shown) for transmitting power between a chain ring 91 fixed to the pedal shaft 93 and a sprocket 90 fixedly mounted on the rear wheel shaft, And a chain transmission 10 that includes a chain 92 and transports the position of the drive chain 92 caught in the chain ring 91 and the sprocket 90.

The drive signal of the chain transmission 10 is generated through the shift switch 20, and the drive signal is transmitted through the signal distributor 30. [

Also includes a battery 40 for driving the chain transmission 10 and a GPS 50 for receiving satellite signals.

The controller 60 that drives the chain transmission 10 detects the inclination angle of the ground from the manual mode or the GPS 50 that drives the chain transmission 10 by operating the shift switch 20, The chain transmission 10 is driven in the automatic mode in which the chain transmission 10 is driven in the set gear ratio range according to the inclination angle.

Here, it may further include a change-over switch 70 for switching between the passive mode and the automatic mode.

The signal of the shift switch 20 can be transmitted through the coaxial line. The connection point of the signal coaxial line is advantageously watertight to prevent shorting.

The electric wire of the shift lever for operating the shift switch 20 is connected to a wiring box (not shown) of the signal distributor 30, and the green and red light of the junction box can display the remaining amount of the battery 40. [

4, the chain transmission 10 includes a front transmission 11 for changing the position of the chain 92 engaged with at least one chain ring 91 connected to the pedal shaft 93 of the bicycle, And a rear derailleur 12 for changing the position of the chain 92 caught in one of the at least one sprocket 90 connected to the rear axle of the bicycle.

Accordingly, the shift switch 20 also includes a forward shift switch 21 for generating a drive signal for driving the front transmission 11, a rear shift switch 22 for generating a driving signal for driving the rear transmission 12, ).

The shift switch 20 may be installed on the handle bar of the bicycle.

Further, the shift switch 20 can display the position of the current shift gear. Each of the shift switches, that is, the forward shift switch 21 and the rear shift switch 22, includes a low-speed and a high-speed shift switch. When the rider of the bicycle presses the low-speed shift switch, The low gear command is transmitted.

When the bicycle rider presses the high-speed shift switch, a high-speed gear command is transmitted to the microprocessor.

On the other hand, in the control device 60, the shifting may be generated in accordance with the operation of the shift switch 20 by the rider, or the automatic shifting may be performed in accordance with the operation of the changeover switch 70.

In the manual mode in which the shifting is performed by the operation of the shift switch 20, the shifting is not performed when the gear ratio is not adequate, thereby preventing the sprocket from being worn and noise from being generated by the chain.

That is, as shown in FIG. 5, such a control is possible by setting and storing an appropriate gear ratio.

For example, when the chain is engaged in the smallest chain ring 91a as shown in the left side of FIG. 5, the sprocket 90 is chained to several gear plates from the leftmost largest gear plate 90a The case is appropriate.

When the chain is engaged with the largest chainring 91c, it is preferable that the sprocket 90 is engaged with several gear plates from the rightmost smallest gear plate 90b.

Such an appropriate gear ratio can be set in advance so that the chain transmission 10 can be controlled in this setting range.

Meanwhile, the automatic transmission mode can control the chain transmission 10 by reading the inclination angle of the current bicycle from the GPS 50 and processing it, thereby setting the optimum gear ratio according to the inclination angle.

For example, the optimum position or the range of the position of the front transmission 11 and the rear transmission 12 can be preset according to the inclination angle, and the chain transmission 10 can be controlled in this state.

Meanwhile, the torque sensing unit 80 can sense the amount of change in torque or torque applied to the rear wheel shaft.

The torque sensing unit 80 can sense the rotational force (torque) for driving the current pedal in real time, and can control the chain transmission 10 with the optimal gear ratio or gear ratio set according to the rotational force.

For example, when driving at a high speed, the bicycle is driven at a high gear ratio. In this case, a large rotational force can be sensed. However, when the torque decreases sharply, the torque sensing unit 80 senses the torque and calculates the amount of change of the corresponding torque over time, thereby controlling the chain transmission 10 with the optimum gear ratio.

The chain transmission 10 may be automatically driven by using the inclination angle detection by the GPS 50 and the rate of change of torque or torque through the torque detection unit 80 as occasion demands.

In this case, it is also possible to set the weights in the detection of the inclination angle and the detection of the torque. For example, it is possible to drive the chain transmission 10 by calculating the inclination angle first, and in this case, the amount of change in torque through the torque sensing unit 80 can be used as supplementary information.

Fig. 6 is a schematic view showing an example of a rear transmission; and Fig. 7 is a schematic diagram showing an example of the installation of a rear derailleur.

6, the rear derailleur 12 includes a slide 13 for transferring the chain so that the chain is engaged with at least one sprocket 90 connected to the rear wheel shaft (hub) of the bicycle, And a slide shaft 14 to which the slide shaft 14 is fed.

A motor 15 for transferring the slide 13 through the slide shaft 14 and a motor controller 15 connected to the controller 60 for driving the motor 15 under the control of the controller 60 16).

The slide shaft 14 is driven by the worm gear 14a connected to the motor 15 and the worm 14b driven by the worm gear 14a and located inside the slide shaft 14, The slide 13 can be transferred by the worm 14b and the worm gear 14a. However, it is not limited thereto.

The slide 13 may be provided with a pulley 17 to which a chain is attached.

As described above, the spiral worm 14b connected to the shaft of the motor 15 moves the slide 13 to the left and right according to the driving of the motor 15, so that the shift can be performed.

The motor 15 and the motor control unit 16 of the rear transmission 12 can be provided in the transmission housing 18 and the transmission housing 18 constitutes the main body of the rear transmission 12, As shown in FIG.

7, the transmission housing 18 of the rear transmission 12 can be installed outside the sprocket 90. This rear transmission 12 is driven by the motor 15, Since the shape does not change, it does not protrude outward. Therefore, it is not vulnerable to an external impact.

The outer surface of the slide shaft 14 is formed in a quadrangular shape so that the position of the pulley 17 can be set by fixing the shift position of the transmission 12.

By the driving of the motor 15, the position of the slide 13 can be transferred, so that the pulley 17 pivotally attached to the chain is fed together to transfer the position of the chain. Accordingly, the rear transmission 12 can adjust the position of the gear plate 95 of the sprocket 90 to which the chain is attached.

The configuration of the rear transmission 12 described above with reference to Figs. 6 and 7 may be the same as that of the front transmission 11. Fig. That is, it can be applied to the front transmission 11 as it is.

The motor control unit 16 may be implemented as a microprocessor in the chain transmission 10 and the circuit board of the motor 15 and the motor control unit 16 may be waterproofed.

In addition, a motor drive circuit and a position sensor may be further included, which can sense the current position of the chain and automatically calibrate its position, as the case may be.

8 is a perspective view showing an example of a shift switch.

The shift switch 20 may include a bracket 23 fixed to the handle bar, and a high-speed shift lever 25 and a low-speed shift lever 26. Further, a communication line 24 for transmitting a driving signal by the operation of the levers 25 and 26 may be provided.

8 shows the shape of the shift switch 20 as an example, and its shape can have various shapes. For example, in the case of a road-type bicycle, a shift lever integrated with the brake lever may be used.

At this time, the operation of the shift switch 20 can be multi-stage shifted by a single operation. For example, when the bicycle occupant needs to continuously shift the chain transmission 10 by one or more steps, the levers 25 and 26 are operated only once, instead of repeatedly depressing the levers 25 and 26 of the shift switch 20 So that the multi-step shift can be performed.

In addition, when the levers 25 and 26 are depressed, the chain transmission 10 can be continuously multi-stepped while it is being pressed.

9 and 10 are flowcharts showing a method of shifting the bicycle using the above-described shift system of the bicycle.

The operation and effect of the present invention will be described with reference to FIGS. 1 to 10. FIG.

As described above, according to the present invention, it is possible to provide an automatic transmission that is operated in a digital manner, which enables rapid shifting and automatic shifting using the inclination angle by using the GPS 50. [

As described above, automatic shifting is possible by using the GPS 50, using the GPS 50 and the torque sensing unit 80, or using the torque sensing unit 80. [

This automatic shifting process may occur as follows.

First, a satellite signal can be received from the GPS 50 when the rider of the bicycle is traveling (S10).

At this time, the inclination angle at the time when the current bicycle is located can be read through the satellite signal (S20).

Then, the chain transmission 10 can be controlled to an optimum gear ratio according to the read inclination angle (S30).

At this time, the drive of the chain transmission 10 can be controlled more precisely by using the torque value and the change amount of the torque through the torque sensing unit 80 as an auxiliary means.

For example, the torque value can be determined based on whether there is no error in the read inclination angle, and in the case where the signal is not received from the GPS 50 in some cases, the control device 60 can determine whether or not to change the torque have.

In some cases, the torque can be sensed by the torque sensing unit 80.

That is, first, the change amount of torque or torque can be measured through the torque sensing unit 80 (S11), and the chain transmission 10 can be controlled according to the measured value (S30).

On the other hand, among the GPS (50) and the torque sensing unit (80), the occupant may select a device to be used for automatic transmission or set a weight.

Such an electric transmission system is fast in shifting and enables precise shifting. The response speed can be adjusted within 2 seconds.

Further, trimming work of the chain transmission 10 is not necessary. In this case, the error may be about 0.5 mm.

In other words, there is no need to finely adjust the positions of the front transmission 11 and the rear transmission 12 by hand. This is because the chain transmission 10 has a position sensor so that it can be positioned through the position sensor.

Moreover, there is little concern about waterproofing and cable contamination, and the in-water resistance of such a transmission system can be realized to be about 1 m.

On the other hand, in the operation of the shift switch 20, shifting of the bicycle can be performed only by lightly pressing operation, and the fatigue of the passenger's fingers can be reduced.

In addition, since the vehicle has the appropriate gear ratio adjusting function set, there is no shift trouble and therefore the ride feeling can be improved.

The passengers of the bicycle can choose between automatic mode and manual mode, so that the bicycle can be operated in various ways depending on the passenger's taste and mood.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Chain transmission 11: Front transmission
12: rear transmission 13: slide
14: Slide shaft 15: Motor
16: motor control unit 17: pulley
18: Transmission housing 20: Shift switch
21: front shift switch 22: rear shift switch
23: Bracket 24: Communication line
25: High-speed shift lever 26: Low-speed shift lever
30: Signal distributor 40: Battery
50: GPS 60: Control device
70: Changeover switch 80: Torque detection unit

Claims (12)

A chain transmission for transferring the position of the driving chain of the bicycle;
A shift switch for generating a drive signal of the chain transmission;
A signal distributor for transmitting a drive signal between the chain transmission and the shift switch;
A battery for driving the chain transmission;
A GPS capable of receiving satellite signals; And
A control unit for driving the chain transmission in an automatic mode for driving the chain transmission in a manual mode for driving the chain transmission by the operation of the shift switch or for sensing the inclination angle of the ground from the GPS and driving the chain transmission in a set gear ratio range according to the inclination angle, ; ≪ / RTI >
Wherein the chain transmission includes at least one chain ring connected to a pedal shaft of a bicycle or a slide for transferring a chain to at least one or more sprockets connected to a rear wheel axis of the bicycle;
A slide shaft having a worm along a longitudinal side wall thereof and having a worm gear at one end thereof and adapted to feed the slide through the spiral worm during rotation;
A motor connected to the worm gear to provide a rotational force to the slide shaft; And
And a motor control unit connected to the control unit to drive the motor under the control of the control unit. The transmission system according to claim 1, further comprising a changeover switch for switching between the manual mode and the automatic mode. The transmission according to claim 1,
A front derailleur changing a position of the chain hooked on at least one or more chainrings connected to a pedal axis of the bicycle; And
And a rear transmission that changes the position of the chain that is engaged with one of at least one of the sprockets connected to the rear wheel axle of the bicycle. delete The transmission system of a bicycle according to claim 1, further comprising a torque sensing unit for sensing a change in torque or torque of the pedal shaft of the bicycle. 6. The transmission system of a bicycle according to claim 5, wherein the automatic mode drives the chain transmission at a set gear ratio range according to a tilt angle of a ground detected from the GPS and a change amount of torque or torque of the pedal shaft. At least one chain ring connected to the pedal shaft of the bicycle or a slide for transferring the chain so that the chain is engaged with at least one or more sprockets connected to the rear wheel axis of the bicycle;
A slide shaft having a worm along a longitudinal side wall thereof and having a worm gear at one end thereof and adapted to feed the slide through the spiral worm during rotation;
A motor connected to the worm gear to provide a rotational force to the slide shaft;
A motor controller for sensing the tilt angle of the ground from the GPS and driving the motor according to the tilt angle; And
And a battery for supplying power to the motor and the motor control unit. 8. The chain transmission of claim 7, wherein the motor control unit drives the motor to transfer the chain so that the gear ratio is set according to the inclination angle. The chain transmission according to claim 7, wherein the motor and the motor control unit are provided outside the sprocket or the chain ring. delete delete delete

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