TWM560431U - Torque detection device for power-assisted bicycle - Google Patents

Abstract

A torque detecting device for assisting a bicycle includes a mounting member fixable on a body of the assist bicycle, and a torque sensing device disposed on the mounting member, the torque sensing device including a sensor elastic disposed on the mounting member and longitudinally disposed The body and the sensor elastic body are provided with a deformation sensor capable of sensing the deformation of the sensor elastomer. The sensor elastic body is provided with a sensing sprocket, and the sensing sprocket and the transmission chain of the assisting bicycle are provided. The tight sections are engaged, and the tensioning section of the transmission chain forms a V-shaped bend at the sensing sprocket. When the tensioning section of the transmission chain is tensioned and the sensing sprocket is pushed up, the sensor elastic body is deformed. The time-varying sensor can output an electrical signal corresponding to the shape variable of the sensor elastomer.

Description

Assisting torque detecting device for bicycle

The invention relates to the technical field of electric assist bicycles, and particularly relates to a torque detecting device for assisting bicycles.

At present, the electric bicycle equipped with the battery and the hub motor has been popularized in China because of its labor saving and convenience. However, the existing electric bicycle has the following problems: although the electric bicycle retains the pedal so that the rider can ride with human power, The pedal and hub motor of the power source can be separately controlled, that is, the rider can directly control the rotational speed of the hub motor through the electric door provided on the handle of the vehicle, so that the vehicle can be driven entirely by electric power. In this way, in the electric riding state, since it is difficult for the rider to control the size of the electric door, the electric auxiliary drive and the foot drive cannot be well matched, so that only the pure electric drive mode can be used, and the pedal ride only has the battery power. Will be used when exhausted. Although the driving method has the advantages of quickness and labor saving, it is easy to generate speeding, which in turn causes unsafe riding. In addition, it can not meet the human body riding requirements of some people to exercise.

To this end, people have invented electric power-assisted bicycles. The basic structure and working principle of electric-assisted bicycles are similar to those of electric bicycles. They also drive the hub motor through the battery to drive the vehicle. However, its control of the hub motor speed is The signals sensed by the corresponding sensors are controlled, and when the controller receives signals such as the speed, torque, or state of the pedal output by the sensor, the working state and output torque of the hub motor can be automatically controlled. That is to say, the rider cannot realize pure electric drive without using the pedal riding, and the electric drive can only be used for the auxiliary drive, thereby effectively limiting the running speed of the vehicle and achieving the purpose of labor saving.

For example, an electric bicycle control method and system disclosed in the Chinese patent document, the publication number is CN106828758A, the method uses a speed sensor to sense the traveling speed of the electric bicycle, and uses the level meter to sense the driving state of the electric bicycle, when the electric bicycle When starting to ride, the traveling speed is greater than zero. At this time, if the driving state of the electric bicycle is in the horizontal driving state, the electric bicycle is driven by the torque of the pedal alone, and the rotation speed of the pedal in the horizontal driving state or Torque value; if the driving state of the electric bicycle is the uphill driving state, the driving motor is started to rotate in the forward direction to form auxiliary power, so that the pedal reaches the rotational speed or the torque value in the horizontal driving state. That is to say, when the vehicle is going uphill, the torque value output by the rider's foot pedal and the running speed of the vehicle are consistent with the horizontal driving; if the driving state of the electric bicycle is the downhill driving state, then relying on the vehicle The inertia reversely drives the drive motor to generate electricity to charge the mobile power source.

Although the above novel creation has the advantage of automatically controlling the driving mode of the vehicle according to the actual driving state, it still has the following drawbacks: First, when the vehicle is in the horizontal driving state for most of the time, the electric assist cannot be realized, that is, The main basis for judging whether or not assistance is needed is the vehicle driving state signal obtained according to the level, and therefore, the assisting effect is not obvious. Secondly, under normal circumstances, people want to have a higher driving speed when driving horizontally, and correspondingly reduce the driving speed when going uphill, in order to avoid excessive load on the mobile power supply and the hub motor and affect its service life. However, the above-mentioned new creation method of output torque control during electric power assist is unreasonable. The control is not the magnitude of the output torque, but the travel speed of the vehicle. Although it is advantageous for simplifying the control mode, it is easy to cause the output when the electric power is assisted. The problem of excessive torque, especially when the slope of the uphill is large, or the load of the vehicle is large, will cause overload operation of the mobile power source and the hub motor, thereby seriously affecting the service life.

In addition, although the above novel creation also mentions the idea of directly providing a torque sensor on the pedal to detect the pedal torque, the existing torque sensor mainly generates a corresponding output electrical signal by deformation after being subjected to the torque. Because the pedals are limited in torque when the vehicle is riding, that is, the amount of deformation is very small, making it difficult for the torque sensor to accurately detect it, and if a higher precision torque sensor is used, It greatly increases the manufacturing cost of the entire vehicle.

The purpose of the novel creation is to solve the problem that the electric drive bicycle adopting the chain drive is difficult to accurately control the output torque of the electric assist according to the torque output of the manpower, and provide a torque detecting device for assisting the bicycle, which can accurately detect the output torque of the human riding. So that the controller is tricked but controls the output of the electric assist The moment makes the output torque of the electric assist match the torque of the human output, ensuring that the rider can conveniently control the riding speed of the vehicle according to his subjective intention, and achieve good exercise effect while saving labor.

In order to achieve the above object, the present invention adopts the following technical solutions: a torque detecting device for assisting a bicycle, comprising a mounting member fixable on a body of the assist bicycle, and a torque sensing device disposed on the mounting member, the torque sensing The device comprises a sensor elastic body disposed on the mounting component and arranged longitudinally, and the sensor elastic body is provided with a deformation sensor capable of sensing the deformation of the sensor elastomer, and the sensor is provided on the elastic body The sensing sprocket, the sensing sprocket meshes with the tensioning section of the transmission chain of the assist bicycle, and the tensioning section of the transmission chain forms a V-shaped bend at the sensing sprocket, and is further provided on the slack section of the transmission chain. The tensioning mechanism that can make the transmission chain have an initial tensioning force. When the tensioning section of the transmission chain is tensioned and the sensing sprocket is pushed up, the sensor elastic body is deformed, and the deformation sensor can be used at this time. An electrical signal corresponding to the shape variable of the sensor elastomer is output.

In the prior art, although there is also a scheme of controlling the output torque of the driving motor by sensing the torque at the pedal and the crankset, the existing sensors for sensing the torque are all changed to the corresponding electrical signals by the shape of the measuring component. Because the pedal and the sprocket wheel are rigid structures, the shape of the pedal and the sprocket wheel is extremely small when the rider is riding. Accordingly, the output of the electrical signal has limited accuracy, or the cost is extremely high. High-precision sensors. For this reason, people usually can only judge whether the vehicle is in running state through the above-mentioned sensors, but cannot control the output torque of the driving motor according to the torque of the pedal or the crankset when riding. This new creation A sensing sprocket that presses the drive chain is disposed on the tensioning section of the drive chain such that the tensioning section forms a V-shaped bend at the sensing sprocket. In this way, when the rider starts to ride, the pedal drives the sprocket wheel to rotate forward, and the tensioning section of the transmission chain is tensioned and tensioned, thereby pushing the sensing sprocket at the V-shaped bend, thereby making sense. The detector elastic body is deformed, and the deformation sensor on the sensor elastic body can output a corresponding electric signal, and the driving motor outputs the corresponding torque according to the magnitude of the electric signal. It can be understood that the sensor elastomer can be sufficiently flexible by reasonable material selection and structural design so that the sensor elastomer can generate a sufficiently large deformation when the vehicle starts to ride. That is to say, the novel creation indirectly obtains the output torque of the human riding by sensing the tension of the transmission chain, so that the output torque of the driving motor and the output torque of the human riding can be conveniently matched. In particular, the sensor elastomer disposed on the mounting member can conveniently form a structure similar to a cantilever beam, so that when the sensing sprocket is pushed by the drive chain, a large bending deformation can be generated, which is beneficial to the controller. Precise control of the output torque of the drive motor. The tensioning mechanism allows the drive chain to have a stable initial tension, thereby ensuring the stability of the electrical signal output by the deformation sensor.

Preferably, one end of the sensor elastic body is fixed on the mounting component, and the sensing sprocket is disposed at the other end of the sensor elastic body, so that the sensor elastic body is in a cantilever shape, The sensing sprocket meshes with the upper side of the tensioning section.

Since the sensor elastomer is in a cantilever beam shape, the sensing sprocket is disposed on the end of the sensor elastic body, so that when the vehicle is riding, the sensing sprocket disposed at the hanging end of the sensor elastic body is The sensor elastomer can be made to have as large a bending deformation as possible, so that the control signal outputted by the deformation sensor can accurately control the driving power. The output torque of the machine.

Preferably, the sensing sprocket is disposed at one end of the sensor elastic body, and the other end of the sensor elastic body is provided with a guiding sprocket, and the sensing sprocket and the guiding sprocket are respectively located in the transmission chain of the assist bicycle On both sides of the tight section, the sensing sprocket and the guiding sprocket respectively mesh with the tensioning section, and the tensioning section of the transmission chain forms a Z-shaped bending after sequentially bypassing the guiding sprocket and the sensing sprocket.

Since the sensing sprocket and the guiding sprocket of the transmission chain are respectively disposed on the upper and lower sides of the tensioning section of the transmission chain, the tensioning section forms a Z-shaped bending at the sensing sprocket. In this way, when the rider starts to ride, the pedal drives the sprocket to rotate in the forward direction, and the tensioning section of the transmission chain is tensioned and tensioned, so that the pushing is on the guiding sprocket and the sensing sprocket, thereby making the sensor The elastic body is twisted and deformed, and the deformation sensor on the sensor elastic body can output a corresponding electric signal, and the driving motor outputs the corresponding torque according to the magnitude of the electric signal. By reasonably designing the relative position between the guiding sprocket and the sensing sprocket, the Z-bend formed by the transmission chain at the sensing sprocket has a sufficient angle so that the tensioning section produces the sensing sprocket. Enough top thrust.

Preferably, the mounting member comprises a vertically arranged bracket seat, the sensor elastomer is fixed to an upper portion of the bracket seat, and a lower portion of the bracket seat is connectable between the crankset and the ratchet fixed to the assist bicycle Detachable hoop on the cross beam.

The detachable hoop facilitates the connection between the bracket seat and the cross rail of the vehicle body. The vertically arranged bracket seat is beneficial to reduce the installation space and at the same time, it can mainly bear the axial tensile force or pressure when the vehicle is riding. Therefore, its strength and rigidity can be remarkably improved.

Preferably, the mounting member comprises a laterally arranged mounting plate, one end of the sensor elastic body is fixed to one side of the mounting plate, and the other side of the mounting plate is provided with a long body connectable to the body of the booster bicycle. a circular screw hole, the other end of the sensor elastic body is provided with a downwardly inclined bending section, the sensing sprocket is disposed at the end of the bending section, and the sensing sprocket and the tensioning section of the transmission chain are on the upper side Engage.

The horizontally arranged mounting plate facilitates the arrangement and installation of the novel creation on the vehicle body, and the downwardly inclined bending section facilitates the separation of the distance between the sensor elastic body and the transmission chain, avoiding two when the vehicle is riding. Interference and friction between the two.

Preferably, the mounting component comprises two vertical bracket seats arranged at intervals. The front and rear ends of the sensor elastic body are respectively fixed on the front and rear brackets, and the sensing sprocket is disposed at In the middle position of the sensor elastic body, the upper part of the bracket seat is provided with a guiding sprocket that meshes with the tensioning section of the transmission chain, and the lower part of the bracket seat is provided with a horizontally connectable and fixed between the crankset and the ratchet of the assist bicycle The detachable hoop on the fork beam, the guide sprocket and the sensing sprocket are respectively located on both sides of the tensioning section of the transmission chain.

In the present solution, two guiding sprockets are arranged on the side of the transmission chain opposite to the sensing sprocket, so that the three sprockets are arranged in a shape of a character. A fixed V-shaped bend can be formed when the drive chain sequentially bypasses the guide sprocket, the sensing sprocket and the guide sprocket. By adjusting the relative positions of the three sprocket wheels, the drive chain forms a deep V-shaped bend to create a greater top thrust on the sensing sprocket under the same drive chain tension and ensure The top thrust received by the sprocket is only related to the tension of the drive chain, that is, the torque of the crankset, and the influence of external factors such as the relative distance between the crankset and the ratchet on the electrical signal output by the angle sensor. And interference.

Preferably, the deformation sensor has a resistance strain gauge attached to the surface of the sensor elastomer to conveniently sense the bending deformation of the sensor elastomer.

Preferably, the tensioning mechanism comprises a tensioning rocker rotatably disposed on the vehicle body at one end, and a tensioning sprocket engaging the slack segment on the other end of the tensioning rocker, the tensioning rocker A tension spring is provided, and the tension spring drives the tension rocker to swing, so that the tension sprocket is pressed against the slack.

The tension spring can be a torsion spring or a tension spring, and the tension sprocket can mesh with the inner side of the slack section, so that the transmission chain forms an inherent tension to avoid output due to changes in the length of the transmission chain, etc. Signal changes.

Therefore, the novel creation has the following beneficial effects: the magnitude of the human output torque of the assist bicycle during riding can be accurately detected, thereby accurately controlling the output torque of the electric assist to match the torque of the human output, ensuring that the rider can The subjective will of oneself conveniently controls the riding speed of the vehicle, and achieves a good exercise effect while saving labor.

The above described features and advantages of the present invention will become more apparent and understood from the following description.

1‧‧‧ body

11‧‧‧Tighten rocker

2‧‧‧ tooth tray

21‧‧‧ crank

22‧‧‧ pedal

3‧‧‧ratchet

4‧‧‧Drive chain

41‧‧‧tension section

42‧‧‧ Relaxation

50‧‧‧ bracket

51‧‧‧Removable hoop

511‧‧‧ clamping plate

52‧‧‧Installation board

521‧‧‧ long round screw holes

6‧‧‧Sensor Elastomer

61‧‧‧Bend section

7‧‧‧Sensing sprocket

8‧‧‧Guiding sprocket

9‧‧‧ tensioning sprocket

Figure 1 is a schematic view of the first structure of the novel creation.

Figure 2 is a schematic view of the second structure of the novel creation.

3 is a schematic view showing a connection structure of a bracket base and a vehicle body.

Fig. 4 is a third structural schematic view of the novel creation.

Figure 5 is a schematic view showing the connection structure of the sensor elastomer and the mounting plate.

Figure 6 is a fourth structural schematic view of the novel creation.

The novel creation will be further described below in conjunction with the drawings and specific embodiments.

As shown in FIG. 1, a torque detecting device for a bicycle is adapted to detect a human output torque of an electric assist bicycle when riding on a pedal of a rider to accurately control an output torque of the electric assist. The assist bicycle includes a vehicle body 1, a crankset 2 and a ratchet wheel 3 disposed on the vehicle body, and a transmission chain 4 disposed on the crankset and the ratchet. The upper side portion between the crankset and the ratchet in the transmission chain is a tensioning section 41. The lower side portion is a slack section 42, and the crankset is connected to the pedal 22 via the crank 21. In addition, the assist bicycle includes a drive motor that can provide auxiliary power, a controller that can control the operating state of the drive motor, and an output torque, and a battery that supplies power to the drive motor.

The novel creation includes a torque sensing device, a mounting component for mounting the torque sensing device, and a mounting component that can be attached to the body of the booster bicycle. In order to facilitate the detection of the human output torque, the torque sensing device includes a rod-shaped sensor elastic body 6 disposed on the mounting member, the sensor elastic body is arranged longitudinally along the front and rear, and a senseable feeling is set on the sensor elastic body. A deformation sensor that deforms the elastomer of the detector. Preferably, the deformation sensor is a strain gauge attached to the surface of the sensor elastomer. In addition, the sensor A sensing sprocket 7 is also arranged on the elastic body, and the sensing sprocket presses against the tensioning section of the transmission chain and meshes with the tensioning section of the transmission chain, so that the tensioning section of the transmission chain is on the sensing sprocket A V-shaped bend is formed at the place.

In this way, when the crank disk drives the ratchet wheel to rotate in the forward direction, the tensioning section of the transmission chain is tensioned and the sensing sprocket is pushed up, so that the sensor elastic body can be bent and deformed, and the deformation sensor at this time The corresponding electrical signal can be output, and the controller controls the driving motor to work after receiving the signal outputted by the deformation sensor, and outputs the corresponding assist torque. It can be understood that when encountering an uphill or a rider wants to increase the riding speed, the manpower torque output by the rider through the pedal will be correspondingly increased, and the tension of the tensioning section of the transmission chain correspondingly Increasing, so that the top thrust received by the sensing sprocket is increased, correspondingly, the bending deformation of the sensor elastic body is increased, the electric signal outputted by the deformation sensor is increased, and the controller controls the output of the driving motor to be larger. Boost torque. By reasonably selecting the structural parameters of the sensor elastomer and the structural parameters such as the length, the sensor elastomer can be sufficiently flexible so that the sensor elastomer can produce a sufficiently large deformation when the vehicle begins to ride. That is to say, the novel creation indirectly obtains the output torque of the human riding by sensing the tension of the transmission chain, and can easily achieve the matching of the output torque of the driving motor and the output torque of the human riding.

In order to ensure the stability of the electrical signal outputted by the deformation sensor, we can provide a tensioning mechanism on the slack section of the transmission chain. Specifically, the tensioning mechanism includes a tensioning rocker 11 and a rotating shaft is arranged on the vehicle body. One end of the tensioning rocker is rotatably disposed on the rotating shaft of the vehicle body, and the other end of the tensioning rocker is suspended and provided with a slack section The inner meshing tensioning sprocket 9 is provided with a tension spring on the tension rocker, and the tension spring drives the tension rocker to swing, so that the tensioning sprocket presses the slack to the outside, thereby making the entire transmission chain Maintain a stable initial tension. When the human is riding, the human torque increases the tension of the tensioning section of the transmission chain, and at this time, the deformation sensor can output a stable electrical signal. Of course, the tension spring may be a torsion spring that is sleeved on the rotating shaft, and the torsion spring is placed at one end to hold the rocker and the other end to the body; or the tension spring may be a tension spring or a tension spring. One end is connected to the tensioning rocker and the other end is connected to the vehicle body.

In order to facilitate sensing the bending deformation of the sensor elastomer, we can fix one end of the sensor elastic body on the mounting component, and the other end of the sensor elastic body is suspended, so that the sensor elastic body is cantilever Beam shape. The sensing sprocket is disposed at one end of the sensor elastomer suspension and the sensing sprocket meshes with the upper side of the tensioning section. In this way, when the vehicle is riding, the sensing sprocket disposed at the hanging end of the sensor elastic body can make the sensor elastic body produce the largest possible bending deformation, so that the control signal outputted by the deformation sensor can be accurately controlled. The output torque of the drive motor.

Preferably, as shown in FIG. 2, we can set the sensing sprocket at one end of the sensor elastic body, and at the other end of the sensor elastic body, a guiding sprocket 8, a guiding sprocket and a sensing sprocket Located on the same side of the sensor elastomer. In addition, the guiding sprocket and the sensing sprocket are respectively located on the upper and lower sides of the tensioning section of the transmission chain, the sensing sprocket is pressed against the tensioning section of the transmission chain, and meshes with the tensioning section of the transmission chain, and the guiding sprocket is abutted The tensioning section of the transmission chain is meshed with the tensioning section of the transmission chain, and the tensioning section of the transmission chain forms a Z-shaped bend after sequentially bypassing the guiding sprocket and the sensing sprocket. In this way, when the crankset passes When the transmission chain drives the ratchet to rotate in the forward direction, the tensioning section of the transmission chain is tensioned and the steering sprocket and the sensing sprocket are pushed up, so that the sensor elastic body can be bent and deformed, and the deformation sensor can be used at this time. The corresponding electrical signal is output, and the controller controls the driving motor to work after receiving the signal outputted by the deformation sensor, and outputs the corresponding assist torque.

In order to facilitate the increase of the strength and rigidity of the mounting component, as shown in FIG. 1, the mounting component may be a vertically arranged bracket seat 50, and the sensor elastic body is fixed to the upper part of the bracket seat by screws, and the lower part of the bracket seat is disposed. Detachable hoop 51. Specifically, as shown in FIG. 3, the detachable hoop includes a semi-circular groove disposed at a lower portion of the bracket seat, and a clamping plate 511 is abutted and screwed at a lower portion of the bracket seat, and the clamping plate is disposed with the bracket seat. A semicircular groove corresponding to a semicircular groove. In this way, we can clamp the cylindrical cross-beam in the body between the crankset and the ratchet in the semi-circular groove in the lower part of the bracket seat, and then put the clamping plate against the lower part of the bracket seat. The beam is simultaneously locked in a semi-circular recess in the clamping plate, and then the clamping plate is tightly fixed to the bracket seat by screws, so that the cross fork beam can be reliably clamped and positioned in the semicircular concave Inside the slot, the bracket is vertically fixed to the cross beam. When the vehicle is riding, the bracket seat mainly receives tensile force or pressure in the axial direction, thereby significantly increasing its strength and rigidity.

Of course, as shown in FIG. 4 and FIG. 5, the mounting member may also adopt a horizontally arranged mounting plate 52. One end of the sensor elastic body is fixed to one side of the mounting plate by screws, and the other side of the mounting plate is Two front and rear round screw holes 521 are provided. In this way, we can fix the mounting plate to the body of the booster bicycle by screws set in the long round screw holes, and the long round screw holes facilitate the adjustment of the position of the mounting plate. Preferably, we can provide a downwardly inclined bending section 61 at the free end of the sensor elastomer, The sensing sprocket is placed at the end of the bent section. In this way, when the sensing sprocket meshes with the upper side of the tensioning section of the transmission chain, a sufficient distance between the sensor elastic body and the transmission chain can be formed to avoid interference and friction between the two when the vehicle is riding.

We know that when the vehicle is riding, the tensioning sections of the transmission chain on the front and rear sides of the sensing sprocket each have an inclined tensioning force, and the two tensioning forces on the front and the rear form a pushing force for the sensing sprocket. Since the inclination angle of the tensioning section on both sides of the sensing sprocket changes with the installation position of the sensing sprocket, the electrical signal output by the resistance strain gauge will be obtained under the same human output torque. The change, in turn, is not conducive to the controller's control of the output torque of the drive motor. To this end, as shown in FIG. 6, the mounting member may also be two bracket frames that are spaced apart from each other, and the two bracket seats are vertically arranged. The front end of the sensor elastomer is fixed on the front bracket seat, the rear end of the sensor elastic body is fixed on the rear bracket seat, and the sensing sprocket is disposed in the middle of the sensor elastic body. And the sensing sprocket meshes with the underside of the tensioning section. In addition, a guide sprocket 8 meshing with an upper side of the tensioning section of the transmission chain is disposed at an upper portion of each bracket seat, and a cross fork beam connectable and fixed between the crankset and the ratchet of the assist bicycle is disposed at a lower portion of the bracket seat The upper detachable hoop, the two guiding sprocket and the sensing sprocket are respectively located on the upper and lower sides of the tensioning section of the transmission chain, thereby forming an inverted character arrangement.

When the transmission chain sequentially bypasses the first guiding sprocket, the sensing sprocket and the second guiding sprocket, the transmission chain forms a convex V-shaped bend at the sensing sprocket, and the V-shaped bending has A fixed angle. We can adjust the relative position of the three sprocket to make the drive chain form a deep V-shaped bend. At this time, the angle of the V-bend is smaller, so that the sensor chain can be under the same transmission chain tension. The wheel forms a larger downward The top thrust, so that the sensor elastic body is deformed, the resistance strain gauge can output the corresponding electrical signal, and can ensure the top thrust of the sensing sprocket and only the tension of the transmission chain, that is, the sprocket wheel Torque-related, avoiding the influence and interference of external factors such as the relative distance between the crankset and the ratchet on the electrical signal output by the angle sensor.

In summary, the present invention discloses a torque detecting device for assisting a bicycle, comprising a mounting component that can be fixed on the body of the assist bicycle, a torque sensing device disposed on the mounting component, and the torque sensing device includes a mounting device. a sensor elastic body arranged on the component and longitudinally disposed, the sensor elastic body is provided with a deformation sensor capable of sensing the deformation of the sensor elastomer, and the sensor elastic body is provided with a sensing sprocket and sensing The sprocket meshes with the tensioning section of the transmission chain of the assist bicycle, and the tensioning section of the transmission chain forms a V-shaped bend at the sensing sprocket, and when the tensioning section of the transmission chain is tensioned and the sensing sprocket is pushed up The sensor elastomer is deformed, and the deformation sensor can output an electrical signal corresponding to the shape variable of the sensor elastomer. The novel creation can accurately detect the amount of human output torque of the assisting bicycle during riding, so as to accurately control the output torque of the electric assist to match the torque of the human output.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the novel creation, and any person skilled in the art can make some changes without departing from the spirit and scope of the novel creation. Retouching, the scope of protection of this new creation is subject to the definition of the scope of the patent application attached.

Claims (8)

A torque detecting device for assisting a bicycle, comprising a mounting member fixable on a body of the assist bicycle, and a torque sensing device disposed on the mounting member, wherein the torque sensing device comprises a longitudinal sensing device disposed on the mounting member a sensor elastic body, wherein the sensor elastic body is provided with a deformation sensor capable of sensing the deformation of the sensor elastic body, and the sensor elastic body is provided with a sensing sprocket, the sensing sprocket Engaging with a tensioning section of the drive chain of the power bicycle, the tensioning section of the transmission chain forms a V-shaped bend at the sensing sprocket, and the transmission is further provided on the slack section of the transmission chain The chain has an initial tensioning tensioning mechanism. When the tensioning section of the chain is tensioned and pushes the sensing sprocket, the sensor elastic body is deformed, and the deformation sensor at this time An electrical signal corresponding to the shape variable of the sensor elastomer can be output. The torque detecting device for a bicycle according to claim 1, wherein one end of the sensor elastic body is fixed to the mounting member, and the sensing sprocket is disposed at the other end of the sensor elastic body. Thereby, the sensor elastomer is in a cantilever shape, and the sensing sprocket meshes with the upper side of the tensioning section. The torque detecting device for a bicycle according to claim 1, wherein the sensing sprocket is disposed at one end of the sensor elastic body, and the other end of the sensor elastic body is provided with a guiding sprocket. The sensing sprocket and the guiding sprocket are respectively located on two sides of the tensioning section of the transmission chain of the assist bicycle, and the sensing sprocket and the guiding sprocket respectively mesh with the tensioning section, and the transmission chain The tensioning section forms a Z-shaped bend after sequentially bypassing the guiding sprocket and the sensing sprocket. The torque detecting device for a bicycle according to claim 1 or 2 or 3, wherein the mounting member comprises a vertically arranged bracket seat, and the sensor elastic body is fixed to the bracket seat In the upper part, the lower part of the bracket base is provided with a detachable hoop that can be connected to a cross fork beam fixed between the crankset of the assist bicycle and the ratchet. The torque detecting device for a bicycle according to claim 1 or 2 or 3, wherein the mounting member comprises a laterally disposed mounting plate, and one end of the sensor elastic body is fixed to the mounting plate One side of the mounting plate is provided with an oblong screw hole connectable to the body of the assist bicycle, and the other end of the sensor elastic body is provided with a downwardly inclined bending section, A sensing sprocket is disposed at an end of the bending section, and the sensing sprocket meshes with an upper side of the tensioning section of the transmission chain. The torque detecting device for a power bicycle according to the first aspect of the invention, wherein the mounting member comprises two vertical bracket seats arranged at intervals, and the front and rear ends of the sensor elastic body are respectively fixed to the front and the rear. The sensing sprocket is disposed at an intermediate position of the sensor elastic body, and the upper portion of the bracket seat is provided with a guiding sprocket that meshes with the tensioning section of the transmission chain, and the lower part of the bracket seat a detachable hoop that is connectable and fixed to the cross yoke between the sprocket wheel and the ratchet of the assist bicycle, the guide sprocket and the sensing sprocket are respectively located at two of the tensioning sections of the transmission chain side. The torque detecting device for a moped bicycle according to the first or second aspect of the invention, wherein the deformation sensor has a resistance strain gauge attached to the surface of the sensor elastomer. The torque detecting device for a bicycle according to claim 1 or 2, wherein the tensioning mechanism includes a tensioning rocker that is rotatably disposed at one end of the body. At the other end of the tensioning rocker, a tensioning sprocket is engaged with the slackening section, and the tensioning rocker is provided with a tensioning spring, and the tensioning spring drives the tensioning rocker to swing, thereby making the tensioning The tightening sprocket presses against the slack.