KR20180083235A - Gear-shifting of a Bicycle and Electronic Control of a screw - Google Patents

Abstract

The present invention relates to an electronic control device for gear-shifting and a screw of a bicycle. According to the present invention, the electronic control device allows a rider to adjust speed in accordance with a slope of a road, riding habit, and the like. As a wire is pulled or released by horizontal movement of a nut screw and a wire holder when a first screw is rotated forward and backward for gear-shifting of a rear wheel side transmission unit, the rear side transmission unit installed in a rear wheel sprocket of a multistage structure is operated and gear-shifting is automatically performed in accordance with the slope of a road surface, such that gear-shifting operation is facilitated and simplified, thereby increasing rider′s convenience and realizing semiautomatic gear-shifting of a driving side transmission unit. As the wire is pulled or released by vertical movement of the nut screw and the wire holder when a second screw is rotated forward and backward for gear-shifting of the driving side transmission unit, the driving side transmission unit is operated to perform gear-shifting. According to the present invention, the electronic control device for gear-shifting comprises a screw, the rear side transmission unit, the driving side transmission unit, a main shaft, left and right bevel gears, and bevel gears.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to an electronic control system for a bicycle gear shift and a screw,

The present invention relates to a transmission for a bicycle capable of adjusting the speed according to the inclination of roads, driving habits, etc. In particular, the bevel gears 27, 57 are rotated in the forward or reverse direction using a small- And an electronic control system of a bicycle for an electronic control system capable of increasing the convenience of the driver by making the shift operation automatically and simply by making the shift operation automatically according to the road surface inclination, Lt; / RTI >

Generally, a bicycle is constructed such that a sprocket having a different size is axially installed on a pedal shaft and a rotary shaft of a rear wheel provided in the main body, and a power is transmitted to the bicycle through a chain. When a user rotates the foot pedal, a drive sprocket The chain is rotated to rotate the rear wheel sprocket, which is provided on the rotary shaft of the rear wheel, so that the rear wheel is rotated to move the main body forward.

These bicycles have different engine speeds depending on the diameter of the rear sprocket and the driving sprocket. In the engineering structure, the faster the diameter ratio between the rear sprocket and the driving sprocket becomes,

Rear sprocket transmission and drive sprocket To operate the shift function of the transmission

Two lines of front and rear wires are hooked and a desired gear is shifted by pulling or loosening the wire by about 20 m / m by a lever provided on the handle.

In order to provide such a function simply and conveniently, the structure of the circular ratchet which is a main component is discarded, and the two-row wire is pulled or loosened by a pair of screws to realize a gear shift.

Recently, a variable-speed bike has been developed in which a plurality of stages of rear-wheel sprockets and a plurality of drive sprockets are provided, and a multi-stage shift is possible according to the combination of the sprockets. In such a speed change bicycle, a shift lever provided on both handles is operated so that the chain is engaged with any one of the multi-stage structure rear sprockets and the multi-stage structure drive sprockets, respectively.

Users of such a change-speed bicycle operate the shift lever provided on both the side handles so that the shift is performed at a high speed on a flat surface and the shift is performed at a low speed on an uphill road. However, it is not easy to operate the shift lever during operation because it is difficult for a beginner or a woman among bicycle users to drive a bicycle. In addition, although the shift lever must be operated naturally according to the road condition or the need, the beginner or the woman can not operate the shift lever precisely, thereby causing the vehicle to run at a lower speed than necessary in a flat place, and to run on an uphill road.

Accordingly, a device has been developed to automatically perform the shifting according to the inclination of the road. However, in this case, the structure of the transmission becomes complicated and the conventional transmission can not be utilized.

On the other hand, as a result of investigation of prior art relating to a transmission of a bicycle, a large number of patent documents have been searched, and some of them are as follows.

In Patent Document 1, a shift lever operated by a hand in a gear bike is installed in a housing attached to a rear wheel frame of a bicycle, and a loosening machine for shifting the rear wheel shaft gear and the drive shaft gear by a parallax is provided at the end of the shift lever The present invention relates to an automatic transmission of a multi-speed gear-type bicycle in which a shift is made using a tension and a length of a chain which changes according to the load of the running state and the magnitude of the acceleration force even when the driver does not operate the road-

Patent Document 2 discloses a bicycle comprising a chain transmission for transmitting a position of a driving chain of a 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 device for driving the 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 tilt angle of the ground from the GPS and driving the chain transmission in the set gear ratio range according to the tilt angle Device.

KR 10-2007-0115397 A KR 10-2015-0011979 A

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and in the application No. 10-2016-0134179, the structure of the circular ratchet and the linear ratchet is provided at the lower end of the crankshaft, Implement automatic shifting.

In order to realize a simpler structure of the mechanical design of the patented circular ratchet and the straight ratchet, two gears of rotating screw and nuts screw are used to pull or loosen the two lines of shift wire respectively to further simplify gear shifting

And the shift screw is reciprocated by the rotation of the screw, so that the shifting wire repeatedly pulls and loosens linearly to shift the gear.

As a means for rotating the screw in the forward or reverse direction, it is possible to perform the forward rotation and the reverse rotation of the small electric motor, or the two electromagnets are symmetrical to each other, and the operation of either one of the electromagnets is switched to the low speed mode and the high speed mode do.

The low speed gear shift and the high speed gear shift can be performed by the operation of the switch or automatically according to the inclination of the road so that the shifting operation can be easily and simplified and the convenience of the user can be increased. The transmission of the present invention.

The means for providing a force to unwind and unwind two lines of wire, respectively, is capable of gear shifting by the rotational force of a crank that rotates with both feet, and a button to assist it is provided on the handle for convenience.

In the present invention, an electronic processor for controlling a mechanical configuration is provided to realize a gear shift of a bicycle, and a mechanical configuration is controlled by a power control unit.

The mechanical construction is described in the first and second embodiments.

The structure of the first embodiment differs from that of the first embodiment in that the rotational power of the screw for pulling or unscrewing the wire shown in FIG. 1 to FIG. 6 is supplied to the two main bevel gears 25, 26 based on the basic engineering theory that the bevel gear A 27 is rotated counterclockwise when the bevel gear A 27 is rotated by the left bevel gear 26 and is reversely rotated by the right bevel 25, The first embodiment of the present invention realizes the gear shifting in the first embodiment.

In the second embodiment, the spur gear 103 and the bevel gear 104 are provided at both ends of the main shaft 102 by one electric motor 100 shown in Fig. 7 to perform forward rotation and reverse rotation, And gear shifting at high speed.

Again, in the first embodiment the power is provided on the crankshaft 21 '

In the second embodiment, power is supplied to the electric motor 100. [

The structure of the other screws and the program of electronic control (S / W) are the same.

In addition, the present invention enables the semi-automatic transmission or the automatic transmission to be performed simply by adding a part of the structure without changing the structure of the transmission provided in the conventional speed change bicycle, It is aimed to provide electronic control of transmission and screw.

In order to achieve the above object, the electronic control of the bicycle gear shift and the screw of the present invention comprises: a rear wheel sprocket transmission and a rear wheel side wire for moving the chain to any one of a plurality of rear wheel sprockets provided on a rear wheel shaft of the bicycle;

A drive sprocket transmission and a drive side wire for moving the chain to one of the drive sprockets of the pedal shaft; A main shaft on which a second gear rotates in engagement with a first gear provided on the pedal shaft;

When the desired gear is shifted, the power is interrupted by the motor having the worm and the worm gear by the stop limit switches (36, 66), the center bevel gears A, B (27, 57) are located at the center and the shift mode is released.

A rear wheel side speed changing portion for pulling or releasing the rear wheel side wire using the rotational force of the main shaft;

A drive side transmission portion for pulling or releasing the drive side wire;

The rear wheel side speed change portion and the drive side transmission portion include a power supply control portion for supplying and cutting off power to the reduction motors (34, 64);

The rear wheel side speed change portion 20 and the drive side transmission portion 60 are installed between the lower portion of the crankshaft of the bicycle or the frame and the drive sprocket, and operate independently of each other.

The rear wheel side transmission portion implements the gear shift by the power supply control portion according to the inclination of the road;

It is preferable that the drive-side speed change portion is arbitrarily selected by the button of the handle.

In the first embodiment, a gear shift corresponding to the degree of inclination is performed by a tilt sensor for measuring the degree of inclination of the road. When the multi-step limit switches are matched, the stop limit switch disengages the power, and the meshed bevel gears 27, So that the shifted gear ratio is stabilized.

As the bevel gears (27, 57) rotate forward and reverse, the nuts (41, 71) reciprocate while the screws (40, 70) The shifted gear ratio is stabilized.

7 is a cross-sectional view of the structure shown in the second embodiment.

In the second embodiment, the electric motor 100 shifts at a low speed or a high speed while rotating forward or backward according to the inclination of the road.

The electric motor includes a speed reducer so that the main shaft rotates at a reduced speed.

When the bevel gears are separated without engagement, they are located at the center respectively, and the right bevel gear and the left bevel gear always rotate independently.

According to the electronic control of the bicycle gear shift and the screw of the present invention, the power source control section automatically controls the gear shift of the rear wheel side speed change section 130 to be shifted to a low speed at the road uphill, Are gear-shifted using the drive-side button 18 of the handle.

In addition, according to the electronic control of the bicycle gear shift and the screw of the present invention, the power source control unit automatically shifts according to the degree of tilt of the tilt sensor that senses the road gradient according to the road gradient.

According to the electronic control of the bicycle gear shift and the screw of the present invention, the power source control unit applies power to the electric motor after a predetermined delay time elapses after receiving the signal of the tilt sensor, thereby preventing abrupt gear shifting And a timer is provided.

According to the electronic control of the bicycle gear shift and the screw of the present invention, the power source control unit determines the speed ratio according to the road gradient detected by the tilt sensor, and determines the speed ratio according to the road inclination So that the transmission ratio can be directly reset.

It should be understood that the above-described configuration and function are mutually opposite to each other, and therefore, the description may be understood as an opposite explanation.

The electronic control of the bicycle gear shift and the screw of the present invention shifts acceleration or deceleration by pulling or releasing the rear wheel side shift wire or the drive side shift wire because the nut screw moves back and forth little by little by two screw rotations, There is no need to operate the shift lever for shifting, so that the shifting operation is easy and the convenience for the driver is increased.

In addition, the electronic control of the bicycle gear shift and the screw of the present invention has an effect of reducing the manufacturing cost by constituting the bicycle gear shift and the electronic control of the screw in a semiautomatic manner capable of shifting to a high speed or a low speed only by pressing the acceleration switch and the deceleration switch.

In addition, according to the electronic control of the bicycle gear shift and the screw of the present invention, since the shift is automatically performed in accordance with the road gradient detected by the tilt sensor, the vehicle can be shifted to a high gear ratio at a high gear ratio at a high speed, The vehicle is shifted to the speed ratio and the vehicle can be driven with less force.

In addition, according to the electronic control of the bicycle gear shift and the screw of the present invention, since a constant delay time is given when the shift is made according to the inclination of the road, it is possible to prevent disruption of the driver due to frequent shifting, .

According to the electronic control of the bicycle gear shift and the screw of the present invention, since the structures of the driving sprocket and the rear wheel sprocket of the bicycle are generally opposite to each other, the driving sprocket transmission is shifted to low speed by releasing the driving side wire, When the transmission is shifted from high speed to low speed, the rear sprocket transmission first operates at a low speed, and later the drive sprocket transmission is shifted at a low speed. Conversely, when shifting from a low speed to a high speed, Is operated at a high speed first and then the rear wheel sprocket transmission is shifted at a high speed so that the driver can maintain the power of turning the pedal for a long time.

According to the electronic control of the bicycle gear shift and the screw of the present invention, the generation of the magnetic force of the electric motor or the electromagnet causes very little electricity consumption, and the power for shifting is provided by the power of rotating the pedal, The longer effect can be seen.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing the entirety of a bicycle for electronic control of a bicycle gear shift and a screw of the present invention; FIG.
2 is a block diagram of electronic control of a bicycle gear shift and a screw of the present invention.
3 shows a first embodiment of the present invention, in which the electronic control of the bicycle gear shift and the screw according to the invention is carried out by means of a right bevel gear 25 and a left bevel gear 26 which are powered and symmetrical in the crank and main shaft, 27 is a perspective view showing the structure of the bevel gears 27,
FIG. 4 is a schematic view showing a structure in which the rotation of the bevel gears 27 and 57 is reversed from the forward rotation by the right and left bevel gears 25 and 26, which are symmetrical in the main shaft, Sectional view of the transmission.
5 is a side sectional view showing the structure of the bevel gear, the first screw 40 and the second screw 70 of the present invention.
6 shows the structure of the bevel gear, the first screw and the second screw of the present invention,
7 is a cross-sectional view showing a gear structure and a screw provided in the electric motor 100 for power for shifting while presenting a second embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

≪ In the first embodiment,

The rear-wheel speed change portion 20 and the drive-side speed change portion 60 are placed, and the rear-wheel-side gear change is performed first on the road uphill.

The power for rotating the screws 40 and 70 is transmitted from the crank 21 and the main shaft 24 to the right bevel gear 25 and the left bevel gear 26, A bevel gear A 27 selectively engaged at the center of the bevel gear 25;

A first screw 40 for rotating the first screw 40 clockwise or counterclockwise as the bevel gear 27 composed of one set cross-links the right bevel gear 25 and the left bevel gear 26;

Since the bevel gear A 27 is moved around the center shaft 31 by the decelerating motor 34 including the worm 33 and the worm gear 32 as the means for moving the selectively moved bevel gear A 27, So that the right and left bevel gears 25 and 26 cross each other.

The symmetrical right bevel gear 25 and the left bevel gear 26 always rotate in a predetermined direction but the center bevel gear A 27 rotates counterclockwise to the right bevel gear 25, The rotation of the screws 40 and 70 makes a right turn and a left turn so that the nut screws 41 and 71 move to the left or right side with a small force, , 72) are pulled and loosened to realize sprocket gear shifting at low speed and high speed.

When the gear is shifted in accordance with the selected engagement of the bevel gear and coincides with the end of the end limit switch 37, the rotation of the deceleration motor 34 and the worm and the worm gear causes the touch rod 35 to move to the stop limit switch 36, The bevel gear A 27 is shifted to the center and the gear shifting is completed.

The rear wheel side transmission portion 20 is selectively engaged with the right and left bevel gears 25 and 26 by a tilt sensor 44 for measuring the tilt angle in accordance with the tilt of the road and a control portion 45 for recognizing the tilt angle Shift gears according to the slope of the road.

If the tilt value of the tilt sensor 44 is applied to the power supply control unit 45 at the road uphill, power is supplied to the deceleration motor 34 and the worm 33 and the worm gear 32 rotate to the center axis 31, the bevel gear A 27 is engaged with the left bevel gear 26 to rotate;

The first screw 40 rotates to the right and the nut screw 41 is narrowed so that the rear wheel side wire holder 41 'and the rear wheel side transmission wire 42 are pulled, Lt; / RTI >

On the contrary, in the case of the flat road, the inclination value of the tilt sensor 44 is opposite to the power source of the power control unit 45 so that the deceleration motor 34 rotates in the opposite direction, When meshing with the bevel gear 25

Accordingly, the first screw 40 rotates counterclockwise and the rear wheel side transmission wire 42, which is pulled by releasing the rear screw wire holder 41 'including the nut screw 41, is released, It realizes gear shift at high speed.

When the gear is shifted in accordance with the degree of inclination of the road, the center limit of the multi-step limit switch (37) coincides with the center switch of the stop limit switch (36).

In order to avoid the gear shift which is too sensitive, the delay time is set and the gear shift is performed only on the stable road.

The tilt value can be reset according to the torque change of the foot leg even if the driver is strong.

When the gear shift occurs at a position where the inclination of the road, the gear ratio of each road and the position of the multi-stage limit 37 match, the stop limit switch 36 cuts off the power.

In the above, the gear shift of the rear wheel side speed change section 20 implements the automatic shift, and a description of the structure of the drive-side speed change section 60 will be described below.

The drive side transmission portion 60 excludes the automatic shift of the tilt sensor 44 and the power source control portion 45 and selects the gear position by the drive side button 18 of the steering wheel at the driver's option.

The reason for this is that the gear ratio of the drive side sprocket of the bicycle is selected by selecting a high ratio (a gear having a large diameter), so that it is preferable to manually shift the automatic transmission rather than the automatic transmission .

Therefore, the drive-side transmission portion 60 is selectively gear-shifted by the drive-side button 18 of the handle, and the structure and operation of the bevel gear are the same as those of the rear wheel side speed change portion 20 described above,

≪ In the second embodiment,

The rear wheel side speed change portion 130 and the drive side speed change portion 140 are disposed

The rear-wheel-side shifting portion first performs the gear shifting at a low speed in the road uphill.

The rear wheel side speed change portion 130 and the drive side speed change portion 140 for gear shifting are provided with power from one electric motor 100 and are connected to the speed reducer 101 including the worm gear and the first The gear 103 and the bevel gear A 104 make no-load rotation;

When the electric power is supplied to the electromagnet 116 while power is supplied to the electromagnet 116 by recognizing the tilt value of the tilt sensor 44 on the road ascending path by the power control unit 45, As the terminal 115 is attached to the right side a electromagnet, the second gear 105 including the sliding bush 106 in the slide key 107 is engaged with the moving first gear 103 to the left.

Accordingly, when the first screw 110 makes a right turn, the nut screw 111 including the rear wheel side wire holder 111 'is pulled with a small force and the rear wheel side transmission wire 118 is pulled, Implement gear shifting at low speed.

The multistage limit switch 113 and the touch rod 112 coincide with each other and power is supplied to the electromagnet 117 so that the terminal 115 is attached to the left side and engaged with the engaged second gear 105 are separated from the first gear 103 and the power supply control unit 45 cuts off the power supply.

The electric power is supplied to the reverse polarity of the battery by the power supply control unit 45 in response to the information of the inclination sensor 44 at the time of reaching the flat surface of the road so that the pair of gears 103, The first screw 110 makes a left turn (reverse rotation), and the nut screw 111 releases the pulled rear wheel side transmission wire 118, so that the rear wheel side transmission 13 shifts to the high speed mode.

When the gear ratio is matched with the degree of inclination of the road and the position of the gear ratio and the position of the multi-stage limit switch 113 coincide with each other, the gears 103 and 105 are spaced apart from each other and shut off.

The gear shift of the drive side transmission portion 140 selectively engages the electromagnets 126 and 127 with the drive side button 18 of the handle according to the selection of the driver as in the first embodiment, Thereby realizing gear shifting.

Although the bevel gear is used to change the movement direction of the gear structure described above, a helical gear may be used.

The direction of rotation of the screw and the forward rotation of the gear for pulling and releasing the ordinary wire for gear shifting can be reversed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be appreciated by those skilled in the art that numerous changes and modifications can be made to the invention without departing from the spirit and scope of the invention. And all such modifications and changes as fall within the scope of the present invention are therefore to be regarded as being within the scope of the present invention.

11: rear wheel sprocket 12: drive side transmission 13: rear wheel side transmission
16: chain 17: rear wheel side button 18: driving side button
20: rear wheel side shifting portion 21; crank 21 '; crankshaft
22, a first gear 23, a second gear 24,
25, a right bevel gear 26, a left bevel gear 27, a bevel gear A
28, a bushing 31, a central shaft 32,
33, a worm 34, a deceleration motor 35, a touch rod
36, a stop limit switch 37, a multi-step limit switch 38, a touch rod
40, a first screw 41, a nut screw 41 ', a rear wheel side wire holder
42: rear wheel-side transmission wire 43: battery 44: tilt sensor
45, a power control unit 57, a bevel gear B 58,
60: drive side transmission portion 61: center shaft 62: worm gear
63, a worm 64, a deceleration motor 65, a touch rod
66, stop limit switch 67, third limit switch 68, touch rod
70: Second screw 71: Nut screw 71 ': Driving side wire holder
72: drive side transmission wire 100: electric motor 101: speed reducer
102, a main shaft 103, a first gear 104, a bevel gear A
105, a second gear 106, a sliding bush 107, a slide key
110, a first screw 111, a nut screw 111 ', a rear-
112, a touch rod 113, a multi-step limit switch 114,
115; a electromagnet 117; b Electromagnetism
118: rear wheel-side transmission wire 120: second screw 121: nut screw
121 '; a driving-side wire holder 122; Touch rod 123; 3-step limit switch
124; a center shaft 125; a terminal 126; a electromagnet
127; b electromagnet 128; drive side transmission wire 130; rear wheel side speed change section
134, a bevel gear B 140, a drive-

Claims (6)

A drive-side transmission (12) for moving the chain to any one of a plurality of drive sprockets axially mounted on a pedal shaft of the bicycle, and a rear wheel side transmission (13) for moving the chain to any one of a plurality of rear wheel sprockets, A rear wheel side transmission wire 42 for operating the rear wheel side transmission 13 and a drive side transmission wire 72 for operating the drive side transmission 12,
A rear wheel-side speed change portion and a drive-side speed change portion are provided, a screw is provided in the rear wheel-side speed change portion and a screw is provided in the drive-side speed change portion;
A rear wheel side speed change portion 20 to which a rear wheel side transmission wire 42 is connected to the rear wheel side transmission 13;
A drive side transmission portion 60 to which a drive side transmission wire 72 is connected to the drive side transmission 12;
A main shaft 24 on which a second gear 23 that meshes with and rotates with a first gear 22 axially installed on the crankshaft 21 'in the rear wheel side speed changing portion 20;
A right bevel gear 25 and a left bevel gear 26, which are axially symmetric with respect to the main shaft 24;
And a bevel gear (27, 57) for making a right turn or a left turn by selective engagement at the center of the two symmetrical bevel gears (25, 26) The rear wheel side speed shift portion (20) according to claim 1, wherein the rear wheel side speed change portion (20) includes a first screw (40) rotating forwardly and reversely including the bevel gear A (27) according to the selection of the low speed mode and the high speed mode;
Electronic control of a bicycle gear shift and a screw composed of a nut screw 41 and a rear wheel side wire holder 41 'for pulling and releasing the rear wheel side transmission wire 42 by the rotation of the first screw 40 The drive-side speed-change section (60) according to claim 1, wherein the drive-side speed change section (60) comprises a bevel gear (B) (57) rotating in the forward rotation in accordance with selective engagement with the right bevel gear (25) A second screw (70) rotating forwardly or reversely;
Electronic control of the bicycle gearshift and the screw consisting of a nut screw 71 and a drive wire holder 71 'for pulling and releasing the drive-side speed-change wire 72 by forward rotation or reverse rotation of the second screw 70 The vehicle according to claim 1, further comprising: a rear wheel side speed change portion (130) and a drive side transmission portion (140);
An electric motor (100) for providing power to the rear wheel side speed changing portion and the drive side speed changing portion; a main shaft (102);
A first gear 103 and a bevel gear A 104, which are installed on the main shaft;
A first gear 103 and a second gear 105 which mesh or are spaced apart from each other for gear shifting of the rear wheel side speed change portion 130;
An electric motor 100 that receives information of the tilt sensor 44 according to the inclination of the road and that performs a reverse rotation and a normal rotation while switching the power source pole of the battery in the power control unit 45;
When a magnetic force is generated in the a electromagnet 116 together with the forward rotation of the electric motor 100 in the uphill road, the first gear 103 and the second gear 105 move to the left about the center shaft 114 A first screw 110 that makes a right turn when it is mated, a rear wheel side wire holder 111 'that pulls a wire to shift gears at a low speed,
When the inclination of the road matches the inclination of the road, the multi-step limit switch 113 is touched, and a magnetic force is generated by supplying power to the b electromagnet 117, so that the meshed second gear 105 is separated from the first gear 103, A rear wheel side speed change portion 130 which is interrupted;
A first screw 110 which generates a magnetic force in the electromagnet 116 and a second gear 105 meshes with the first gear 103 and turns to the left by the reverse rotation of the electric motor 100, A nut screw 111 and a rear-wheel-side wire holder 111 'that release the wire 118 to be shifted at high speed;
When the gear shifting is completed, the electric motor generates magnetic force in the electromagnet 117 and the gears 103 and 105 are separated from each other and the electric power is shut off;
A timer in which a delay time of several seconds is set in the power control section 45 to avoid a gear shift which is too sensitive;
The drive-side speed change section (60)
A pair of bevel gears (104, 134) for directing the power transmission direction upward;
An electromagnet 126 generating a magnetic force to engage the one set of bevel gears 104 and 134 for gear shifting and a b electromagnet 127 generating a magnetic force for separating the gear after the gear shifting is completed Electronic control of gears and gears The power transmission apparatus according to claim 2 or 4, wherein the rear wheel side transmission portion (20, 130) comprises a power supply control portion (45) for performing gear shifting in accordance with the information of the tilt sensor (44) Electronic control of gears and gears of bicycle gears The electronic control unit of claim 5, wherein the bike handle is provided with a rear-wheel-side button (17) and a driving-side button (18)

Images