CN115465399A - Torque and speed sensor device and electric bicycle - Google Patents

Abstract

The invention discloses a torque and speed sensing device and an electric bicycle, wherein the torque and speed sensing device comprises a center shaft, a connecting piece, a deforming piece, a mounting frame, a signal processing circuit board, a speed sensor, a permanent magnet and a torque sensor, the center shaft is rotationally arranged in a five-way pipe, an induction tooth part is arranged on the outer wall of the center shaft, the connecting piece is sleeved on the periphery of the center shaft, the speed sensor is arranged on the signal processing circuit board and is arranged opposite to the induction tooth part, compared with the existing torque and speed sensor, the torque and speed sensing device is simpler to process a face tooth part and lower in processing difficulty by arranging the induction tooth part on the center shaft, and the tooth number density can be higher on the other hand, so that the induction precision of the speed sensor is improved.

Description

Torque and speed sensor device and electric bicycle

technical field

The invention relates to the technical field of electric bicycles, in particular to a torque and speed sensing device and an electric bicycle.

Background technique

Among the related technologies, the in-wheel motor driving system occupies a certain market in the electric bicycle industry due to its price advantage and the advantages of easy modification. How the power drive of the hub motor cooperates with manpower to enable users to obtain a comfortable riding experience has always been the goal pursued by electric bicycle practitioners, and the signal acquisition of manpower is crucial to the basis of drive control. One of the advantages of electric bicycle hub motors is that the changes to traditional bicycles are small and the modification is simple. At the same time, the power of the left and right pedals of traditional bicycles first gathers on the central shaft, so how to realize the signal in the space where the traditional bicycle central shaft is installed Acquisition and minimal modification of traditional bicycles is one of the difficulties in the design of power-assisted electric bicycle drive components.

At present, the existing products on the market, the scheme of speed and steering induction adopts a radially magnetized speed magnetic ring on the central shaft, and a speed sensor is placed at the corresponding position of the magnetic ring. When the central shaft is forced to rotate, it drives The speed magnetic ring rotates synchronously, and the speed sensor senses the magnetic field change when the speed magnetic ring rotates to judge the rotational speed and steering direction of the center shaft. Problems in this scheme: 1. The more the number of pole pairs of the speed magnetic ring, the higher the precision. However, the space diameter is small and the magnetization width is limited, so the number of pole pairs can only be 16 pairs of poles; 2. The induction of the torque sensor relies on electricity or magnetism, and the speed magnetic ring has a magnetic field, and the distance between it and the deformed part is relatively close , It is easy to interfere with the signal of the torque sensor, which reduces the accuracy of the torque sensor.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the present invention proposes a torque and speed sensing device with high sensing precision.

The present invention also provides an electric bicycle with the above torque and speed sensing device.

The torque and speed sensing device according to the embodiment of the first aspect of the present invention includes:

The central shaft is rotatably arranged in the five-way pipe, and the outer wall of the central shaft is provided with an induction tooth portion, and the induction tooth portion includes a plurality of teeth uniformly distributed along the outer wall of the central shaft;

The connecting piece is sleeved on the outer periphery of the central shaft, and is used to transmit power to the crankset;

A deformable part, one end is fixedly connected to the central shaft, and the other end is fixedly connected to the connecting part;

The mounting frame is fixedly arranged in the bottom bracket and sleeved on the outer periphery of the deformable part;

A signal processing circuit board installed on the mounting frame;

a speed sensor installed on the signal processing circuit board and arranged opposite to the induction tooth;

A permanent magnet installed on the side of the signal processing circuit board away from the speed sensor, the speed sensor is used to sense the change of the magnetic field of the permanent magnet to transmit a speed signal to the signal processing circuit board;

The torque sensor is installed on the installation frame and is used for sensing the deformation of the deformable part, so as to transmit the torque signal to the signal processing circuit board.

The torque and speed sensing device according to the embodiment of the first aspect of the present invention has at least the following beneficial effects:

When the user inputs power into the central shaft by stepping on it to make the central shaft rotate, the multiple teeth of the induction teeth following the rotation of the central shaft can cause the magnetic field of the permanent magnet to change, and the speed sensor can sense the change of the magnetic field to generate a speed signal, and then the The speed signal is sent to the signal processing circuit board for processing to obtain the rotation speed and rotation direction of the center shaft. At the same time, when the center shaft rotates, the power of the center shaft is transmitted to the connecting part through the deformation part, and then sent to the tooth plate through the connecting part to drive When the wheel rotates, the deformed part will deform during the process of transmitting power. The torque sensor can sense the deformation of the deformed part to generate a torque signal, and then transmit the torque signal to the signal processing circuit board for processing to obtain the torque of the power input to the center shaft Size, the signal processing circuit board sends the speed signal and torque signal to the controller of the hub motor after preliminary processing, and the controller then controls the hub motor to output appropriate power to cooperate with human-driven vehicles, so that users can get a comfortable riding experience . Compared with the existing torque and speed sensors, the torque and speed sensing device is equipped with induction teeth on the central shaft. On the one hand, the processing of the teeth is simpler and the difficulty of processing is reduced. On the other hand, the tooth number density can be set higher, so that there is It is beneficial to improve the induction accuracy of the speed sensor. At the same time, since the permanent magnet is installed on the mounting frame and is far away from the deformed part, it can reduce the magnetization effect of the permanent magnet on the deformed part and reduce the interference to the torque sensor, thereby helping to improve the performance of the torque sensor. Sensing accuracy.

According to some embodiments of the present invention, the torque and speed sensing device further includes a shield, and the shield is disposed on the outer periphery of the torque sensor.

According to some embodiments of the present invention, the outer wall of the installation frame is provided with protrusions located at both axial ends of the torque sensor, and the shielding member is clamped between the two protrusions.

According to some embodiments of the present invention, the torque sensor includes two induction coils, the outer wall of the installation frame is provided with two annular grooves, and the two induction coils are installed in the corresponding annular grooves.

According to some embodiments of the present invention, the torque sensor further includes a connection wire, the induction coil is connected to the signal processing circuit board through the connection wire, and the outer wall of the installation frame is provided with a avoidance slot.

According to some embodiments of the present invention, the installation frame is provided with a groove, and the speed sensor is embedded in the groove.

According to some embodiments of the present invention, it further includes a first mounting seat and a second mounting seat, the first mounting seat and the second mounting seat are mounted on both ends of the bottom bracket tube in the axial direction, and the middle The shaft is rotatably mounted on the first mounting seat through the first bearing, and the connecting piece is rotatably mounted on the second mounting seat through the second bearing.

According to some embodiments of the present invention, the inner wall of the first mounting seat is provided with a card slot, and the outer wall of the mounting frame is provided with a rib, and the mounting frame is connected to the card slot by the rib and fixed on the first mount.

According to some embodiments of the present invention, a boss is provided on the outer wall of the deformation member, a limiting member is installed on the outer wall of the central shaft, and the installation frame is clamped between the boss and the limiting member.

According to some embodiments of the present invention, the outer wall of the central shaft is provided with a mounting tooth portion, and the inner wall of the deformation member is provided with a mating tooth portion that cooperates with the mounting tooth portion.

According to some embodiments of the present invention, the outer wall of the central shaft is further provided with a stop ring, and the stop ring is located between the installation tooth part and the induction tooth part.

The electric bicycle according to the embodiment of the second aspect of the present invention includes the torque and speed sensing device of the embodiment of the first aspect of the present invention.

The electric bicycle according to the embodiment of the second aspect of the present invention has at least the following beneficial effects:

Since the electric bicycle adopts the above-mentioned torque and speed sensing device, when the user inputs power into the central shaft by stepping on it to make the central shaft rotate, the multiple teeth of the induction teeth that follow the rotation of the central shaft can cause the magnetic field of the permanent magnet to change, and the speed sensing The sensor can sense the change of the magnetic field to generate a speed signal, and then send the speed signal to the signal processing circuit board for processing to obtain the rotation speed and direction of the center shaft. At the same time, when the center shaft rotates, the power of the center shaft is transmitted to the connection The parts are then sent to the crankset through the connecting parts to drive the wheels to rotate. The deformed parts will deform during the process of transmitting power. The torque sensor can sense the deformation of the deformed parts to generate a torque signal, and then send the torque signal to the signal processing The circuit board performs processing to obtain the torque of the power input to the center shaft. The signal processing circuit board sends the speed signal and torque signal to the controller of the hub motor after preliminary processing. The controller then controls the hub motor to output appropriate power to match the human drive. The vehicle travels, so that the user can obtain a comfortable riding feeling. Compared with the existing torque and speed sensors, the torque and speed sensing device is equipped with induction teeth on the central shaft. On the one hand, the processing of the teeth is simpler and the difficulty of processing is reduced. On the other hand, the tooth number density can be set higher, so that there is It is beneficial to improve the induction accuracy of the speed sensor. At the same time, since the permanent magnet is installed on the mounting frame and is far away from the deformed part, it can reduce the magnetization effect of the permanent magnet on the deformed part and reduce the interference to the torque sensor, thereby helping to improve the performance of the torque sensor. Induction accuracy, which in turn helps to improve the effect of the hub motor power assist, thereby improving the riding comfort of the user.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a torque and speed sensing device in some embodiments of the present invention;

Figure 2 is an enlarged view of A in Figure 1;

3 is a schematic diagram of an exploded structure of a torque and speed sensing device in some embodiments of the present invention;

Fig. 4 is a schematic diagram of the three-dimensional structure of the central axis of some embodiments of the present invention;

Fig. 5 is a schematic diagram of an exploded structure of a mounting frame, a signal processing circuit board, a speed sensor and a torque sensor in some embodiments of the present invention;

Fig. 6 is a three-dimensional structural schematic diagram of a connector in some embodiments of the present invention;

Fig. 7 is a schematic perspective view of the three-dimensional structure of the deformable part in some embodiments of the present invention;

Fig. 8 is a schematic perspective view of the first mounting base of some embodiments of the present invention.

Reference signs:

Central shaft 100; induction tooth part 110; installation tooth part 120; retaining ring 130;

Connecting piece 200; Cooperating connecting part 210;

Deformation part 300; matching tooth part 310; boss 320; connecting tooth part 330;

Mounting frame 400; groove 410; rib 420; undercut structure 430; protruding ring structure 440; annular groove 450; avoidance groove 460;

Signal processing circuit board 500; signal line 510;

Speed sensor 600;

permanent magnet 700;

Torque sensor 800; induction coil 810; connecting wire 820; shielding part 830;

The bottom bracket 900 ; the first mounting base 910 ; the card slot 911 ; the second mounting base 920 ; the first bearing 930 ; the second bearing 940 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc. indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, several means one or more, and multiple means two or more. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features relation.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection, assembly, and cooperation should be understood in a broad sense, and those skilled in the art can reasonably determine the meaning of the above words in the present invention in conjunction with the specific content of the technical solution Concrete meaning.

Among the related technologies, the in-wheel motor driving system occupies a certain market in the electric bicycle industry due to its price advantage and the advantages of easy modification. How the power drive of the hub motor cooperates with manpower to enable users to obtain a comfortable riding experience has always been the goal pursued by electric bicycle practitioners, and the signal acquisition of manpower is crucial to the basis of drive control. One of the advantages of electric bicycle hub motors is that the changes to traditional bicycles are small and the modification is simple. At the same time, the power of the left and right pedals of traditional bicycles first gathers on the central shaft, so how to realize the signal in the space where the traditional bicycle central shaft is installed Acquisition and minimal modification of traditional bicycles is one of the difficulties in the design of power-assisted electric bicycle drive components.

At present, the existing products on the market, the scheme of speed and steering induction adopts a radially magnetized speed magnetic ring on the central shaft, and a speed sensor is placed at the corresponding position of the magnetic ring. When the central shaft is forced to rotate, it drives The speed magnetic ring rotates synchronously, and the speed sensor senses the magnetic field change when the speed magnetic ring rotates to judge the rotational speed and steering direction of the center shaft. Problems in this scheme: 1. The more the number of pole pairs of the speed magnetic ring, the higher the precision. However, the space diameter is small and the magnetization width is limited, so the number of pole pairs can only be 16 pairs of poles; 2. The induction of the torque sensor relies on electricity or magnetism, and the speed magnetic ring has a magnetic field, and the distance between it and the deformed part is relatively close , It is easy to interfere with the signal of the torque sensor, which reduces the accuracy of the torque sensor.

In order to solve at least one of the above-mentioned technical problems, the present invention proposes a torque and speed sensing device, which can obtain higher sensing accuracy and is simpler to manufacture.

Referring to Fig. 1 to Fig. 3, a torque and speed sensing device provided by the embodiment of the first aspect of the present invention includes a central axis 100, a connecting piece 200, a deformable part 300, a mounting frame 400, a signal processing circuit board 500, a speed sensing 600, permanent magnet 700 and torque sensor 800. The frame of the power-assisted electric bicycle is provided with a bottom bracket 900, and the central axis 100 is arranged in the bottom bracket 900 and can rotate in the bottom bracket 900. When pedaling, the power of pedaling will be input to the bottom bracket 100. The outer wall of the central shaft 100 is provided with a sensing tooth portion 110 , the sensing tooth portion 110 includes a plurality of teeth, and the plurality of teeth are uniformly distributed along the outer wall of the central shaft 100 , with gaps between adjacent teeth.

The connecting member 200 is sheathed on the outer periphery of the central shaft 100 and coaxially and loosely matched with the central shaft 100 . The connecting piece 200 is connected with the crankshaft for transmitting power to the crankshaft, and the crankshaft drives the wheel to rotate through the transmission mechanism.

One end of the deformable member 300 is fixedly connected to the central shaft 100 , and the other end is fixedly connected to the connecting member 200 , so as to transmit the power of the central shaft 100 to the connecting member 200 . For example, the deformable part 300 is roughly in the shape of a cylinder, and one end of the deformable part 300 can be socketed and fixed on the outer wall of the central shaft 100, and the other end can be coaxially matched with the central shaft 100, and the connecting part 200 can be socketed and fixed on the outer wall of the deformable part 300. the outer wall at the other end. The deformable part 300 will be subject to a large torque during the power transmission process, and will produce a certain deformation at the same time, so the deformable part 300 can be made of a metal material with high strength and certain elasticity, for example, it can be made of aluminum alloy or steel become.

The installation frame 400 is fixedly disposed in the bottom bracket 900 , and the installation frame 400 is sheathed on the outer periphery of the deformation member 300 . The signal processing circuit board 500 is installed on the side of the mounting frame 400 away from the center shaft 100 , and the signal processing circuit board 500 is provided with a signal line 510 connected to the controller of the in-wheel motor. The speed sensor 600 is installed on the signal processing circuit board 500 , and the speed sensor 600 is disposed opposite to the sensing tooth portion 110 of the center shaft 100 . The permanent magnet 700 is installed on the side of the signal processing circuit board 500 facing away from the speed sensor 600 . The speed sensor 600 is used to sense the change of the magnetic field of the permanent magnet 700 to transmit the speed signal to the signal processing circuit board 500 . Specifically, when the central shaft 100 rotates, the induction tooth part 110 follows the rotation of the central shaft 100. Since the magnetic field lines will preferentially pass through materials with high magnetic permeability, the multiple teeth of the induction tooth part 110 will drive the magnetic field lines to move when they rotate. , so that the magnetic field of the permanent magnet 700 changes, and the speed sensor 600 can sense the change and output a corresponding speed signal.

The torque sensor 800 is installed on the installation frame 400 , and the torque sensor 800 can sense the deformation of the deformable part 300 to transmit the torque signal to the signal processing circuit board 500 . Specifically, the torque sensor 800 is located outside the middle of the deformable part 300 , so that it can more sensitively sense the degree of twisting and deformation of the deformable part 300 .

When the user steps on the pedal, the pedal will input power into the central shaft 100 to make the central shaft 100 rotate, and the multiple teeth of the induction tooth part 110 following the rotation of the central shaft 100 can cause the magnetic field of the permanent magnet 700 to change, and the speed sensor 600 can sense the magnetic field. change to generate a speed signal, and then send the speed signal to the signal processing circuit board 500 for processing to obtain the rotation speed and direction of rotation of the central shaft 100. At the same time, when the central shaft 100 rotates, the power of the central shaft 100 is transmitted to the connection through the deformable part 300 part 200, and then transported to the crankshaft through the connecting part 200 to drive the wheel to rotate, the deformation part 300 will be deformed in the process of transmitting power, and the torque sensor 800 can sense the deformation of the deformation part 300 to generate a torque signal, and then the torque The signal is sent to the signal processing circuit board 500 for processing to obtain the torque of the power input to the center shaft 100. The signal processing circuit board 500 sends the speed signal and torque signal to the controller of the hub motor after preliminary processing, and the controller then controls the hub motor Proper power is output to cooperate with manpower to drive the vehicle, so that the user can obtain a comfortable riding experience. Compared with the existing torque and speed sensors, this application sets the induction tooth part 110 on the central shaft 100. On the one hand, the processing of the teeth is simpler and the difficulty of processing is reduced. On the other hand, the tooth number density can be set higher, which is beneficial to increase the speed. The induction accuracy of the inductor 600, and because the permanent magnet 700 is installed on the mounting frame 400, it can be farther away from the deformable part 300 than the existing technology, reducing the magnetization effect of the permanent magnet 700 on the deformable part 300 and reducing the impact on the torque sensor. 800 interference, which is beneficial to improve the sensing accuracy of the torque sensor 800.

It can be understood that, in order to reduce the interference of external signals to the torque sensor 800, referring to FIG. 1 and FIG. It is arranged on the outer periphery of the torque sensor 800 so as to isolate external electromagnetic signal interference and improve the sensing accuracy of the torque sensor 800 . Specifically, the shielding part 830 is made of metal material, for example, the shielding part 830 may be made of a metal shell or a wire mesh, which can play a good shielding effect.

It can be understood that, in order to limit the shielding member 830 on the installation frame 400, referring to FIG. On the outer sides of both ends of the axial direction of 800, when the shielding member 830 is placed on the outer periphery of the torque sensor 800, the two protrusions can limit the movement of the shielding member 830 in the axial direction, thereby preventing the shielding member 830 from moving in the axial direction , which is beneficial to improve the shielding effect of the shielding member 830 on the torque sensor 800 . Of course, the structures of the two protrusions can be the same or different. For example, one of the protrusions is a protruding ring structure 440, and the other protrusion is an undercut structure 430. The side of the undercut structure 430 away from the protruding ring structure 440 has Slopes to facilitate the introduction of the shield 830 . When installing the shield 830, the shield 830 can be moved from the undercut structure 430 toward the convex ring structure 440 to be sleeved on the outer periphery of the torque sensor 800. When the shield 830 moves to the undercut structure 430 and the convex ring structure 440 When between, the shielding member 830 will be limited by the undercut structure 430 and the protruding ring structure 440 and cannot move axially.

It should be noted that, in some embodiments of the present invention, referring to FIG. 5 , the torque sensor 800 includes two induction coils 810, and the outer wall of the installation frame 400 is provided with two annular grooves 450, and the two induction coils 810 are wound and installed. In the corresponding annular groove 450 , the installation of the induction coil 810 is made firmer, preventing the induction coil 810 from easily shaking and affecting the sensing accuracy of the deformation of the deformable part 300 .

It can be understood that, in some embodiments of the present invention, referring to FIG. 5 , the torque sensor 800 also includes a connecting wire 820, the induction coil 810 is connected to the signal processing circuit board 500 through the connecting wire 820, and the outer wall of the mounting frame 400 is provided with The avoidance groove 460, the connection line 820 is accommodated in the avoidance groove 460, so that the connection line 820 can be prevented from protruding from the outer wall of the installation frame 400, which is conducive to improving the installation stability of the connection line 820 and reducing the influence of the outside on the connection line 820 , so that it is beneficial to further improve the sensing accuracy of the torque sensor 800 .

It can be understood that, in some embodiments of the present invention, with reference to FIG. Being close to the sensing tooth portion 110 makes it easier to cause a change in the magnetic field of the permanent magnet 700 when the sensing tooth portion 110 rotates, thereby improving the sensing accuracy of the speed sensor 600 .

It can be understood that, in order to facilitate the installation of the central shaft 100 and the connecting piece 200, in some embodiments of the present invention, referring to FIG. A bearing 930 and a second bearing 940, the first mounting seat 910 and the second mounting seat 920 are mounted on both ends of the bottom bracket 900 in the axial direction, the central shaft 100 is rotatably mounted on the first mounting seat 910 through the first bearing 930, The connecting member 200 is rotatably mounted on the second mounting base 920 through the second bearing 940 . Specifically, the first mounting seat 910 can be fixedly mounted on one end of the bottom bracket 900 in the axial direction through threaded connection or interference fit, and the second mounting seat 920 can be fixedly mounted on the bottom bracket 900 through threaded connection or interference fit. The other end of the through pipe 900 along the axial direction. The first mounting base 910 is a hollow structure, the outer ring of the first bearing 930 is fixedly connected to the inner wall of the first mounting base 910, and the inner ring of the first bearing 930 is sleeved and fixed on the outer wall of the central shaft 100, so the central shaft 100 can pass through the first mounting base 910. A bearing 930 is installed in the bottom bracket 900 and can rotate smoothly. The second mounting seat 920 is a hollow structure, the outer ring of the second bearing 940 is fixedly connected to the inner wall of the second mounting seat 920, and the inner ring of the second bearing 940 is fixedly sleeved on the outer wall of the connecting piece 200, so that the connecting piece 200 can Smooth rotation is achieved by the second bearing 940 .

Of course, the outer wall of the central shaft 100 and the inner wall of the first mounting seat 910 can also be provided with a first raceway that cooperates, and balls are installed in the first raceway, so that the central shaft 100 can be rotatably installed on the first mounting seat 910 Inside. Similarly, the outer wall of the connector 200 and the inner wall of the second mounting seat 920 can also be provided with a matching second raceway, and balls are installed in the second raceway, so that the connector 200 can be rotatably mounted on the second mounting seat 920 Inside.

It can be understood that, in order to fix the installation frame 400 in the bottom bracket 900 in the circumferential direction, referring to FIG. 5 and FIG. 8 , in some embodiments of the present invention, the inner wall of the first installation base 910 is provided with a card slot 911, the outer wall of the mounting frame 400 is provided with a rib 420, the slot 911 and the rib 420 are arranged along the axial direction of the bottom bracket 900, the mounting frame 400 is mounted on the first installation by snapping the rib 420 to the slot 911 Seat 910, so that the mounting frame 400 can be fixed in the circumferential direction, thereby preventing the mounting frame 400 from rotating relative to the bottom bracket 900 and affecting the normal operation of related components installed thereon. Of course, there can be multiple locking grooves 911, and the multiple locking grooves 911 are arranged at intervals along the circumferential direction. There can also be multiple ribs 420, and the plurality of ribs 420 are arranged at intervals along the circumferential direction, so that through the plurality of convex ribs, The ribs 420 are snapped into the corresponding slots 911 , so that the mounting bracket 400 can be more stably fixed in the bottom bracket 900 in the circumferential direction. Of course, the installation frame 400 can also be fixedly connected to the inner wall of the bottom bracket 900 , or the installation frame 400 can be fixedly connected to the second installation seat 920 .

It can be understood that, in order to limit the installation frame 400 in the axial direction and prevent the installation frame 400 from moving in the axial direction, in some embodiments of the present invention, referring to FIG. 1 and FIG. 7 , the deformation member 300 is far away from the speed sensor 600 The outer wall of one end of the central shaft 100 is provided with a boss 320, and the outer wall of the end of the central axis 100 far away from the torque sensor 800 is equipped with a limiter, and the mounting frame 400 is clamped between the boss 320 and the limiter, so that the boss 320 and the limiter The position piece can play a role of blocking the installation frame 400 to prevent the installation frame 400 from moving in the axial direction. Specifically, the limiting member may be a structure such as a snap ring or a bushing, which can well block the movement of the installation frame 400 in the axial direction.

It can be understood that, in order to transmit the power of the central shaft 100 to the deformation member 300 more reliably, in some embodiments of the present invention, referring to FIG. 4 and FIG. 7 , the outer wall of the central shaft 100 is provided with a mounting tooth portion 120, The installation tooth portion 120 includes a plurality of circumferentially evenly distributed teeth, and the inner wall of the deformation member 300 is provided with a mating tooth portion 310 that cooperates with the installation tooth portion 120. The mating tooth portion 310 includes a plurality of circumferentially evenly distributed mating teeth. The tooth part 310 is set on the outer periphery of the tooth part 120, so that the deformable part 300 is clamped and fixed on the outer wall of the central shaft 100, and the power transmission between the central shaft 100 and the deformable part 300 is more reliable through the cooperation of the teeth. The situation that the deformation member 300 slips relative to the center shaft 100 when the power is too large is reduced. Similarly, a similar structure can also be adopted between the deformation member 300 and the connecting member 200 to realize reliable transmission of power. For example, referring to FIGS. 6 and 7 , the outer wall of the deformable part 300 away from the end of the matching tooth portion 310 is provided with a connecting tooth portion 330 , and the inner wall of one end of the connector 200 is provided with a matching connecting portion 210 , and the matching connecting portion 210 is sleeved on the connecting tooth. part 330, so that the connecting part 200 is fixedly connected to the deformable part 300, and the power is transmitted between the two through the cooperation of the teeth, so that the power transmission is more reliable.

It should be noted that, in order to prevent the deformation member 300 from moving in the axial direction, in some embodiments of the present invention, referring to FIG. 1 and FIG. Between the inductive tooth portion 110, the retaining ring 130 can block the axial movement of the deformable part 300. Of course, a stopper such as a retaining spring can be fixedly installed on the outer wall of the central axis 100, and the retaining ring is located on the deformable part 300. A side away from the stop ring 130 , thereby restricting the axial movement of the deformation member 300 through the cooperation of the snap spring and the stop ring 130 .

The electric bicycle of the embodiment of the second aspect of the present invention includes a vehicle frame, wheels, hub motors, and the torque and speed sensing device of the embodiment of the first aspect of the present invention. The frame is provided with a bottom bracket 900, and the torque and speed sensing devices are installed in the bottom bracket 900. The wheels are rotatably mounted on the frame, and the casing of the hub motor is fixedly connected with the wheels. The torque and speed sensing device sends the collected rotational speed, steering and torque information of the center shaft 100 to the controller, and the controller controls the hub motor to output appropriate power according to the above information, so as to drive the wheel to rotate with the power of the user's pedaling to achieve good performance. The boost effect, so that the user can obtain a comfortable riding feeling.

Since the electric bicycle adopts the torque and speed sensing device of the embodiment of the first aspect of the present invention, when the user steps on the pedal, the pedal will input power into the central shaft 100 to make the central shaft 100 rotate, and the induction teeth 110 that follow the rotation of the central shaft 100 A plurality of teeth can cause the magnetic field of the permanent magnet 700 to change, and the speed sensor 600 can sense the change of the magnetic field to generate a speed signal, and then send the speed signal to the signal processing circuit board 500 for processing to obtain the rotation speed and rotation speed of the central shaft 100 At the same time, when the center shaft 100 rotates, the power of the center shaft 100 is transmitted to the connection part 200 through the deformation part 300, and then is transmitted to the crankshaft through the connection part 200 to drive the wheel to rotate. The deformation part 300 will generate during the power transmission process. deformation, the torque sensor 800 can sense the deformation of the deformable part 300 to generate a torque signal, and then transmit the torque signal to the signal processing circuit board 500 for processing to obtain the torque value of the power input to the center shaft 100, and the signal processing circuit board 500 converts the speed After preliminary processing, the signal and torque signal are sent to the controller of the hub motor, and the controller then controls the hub motor to output appropriate power to cooperate with the human-driven vehicle, so that the user can obtain a comfortable riding experience. Compared with the existing torque and speed sensors, this application sets the induction tooth part 110 on the central shaft 100. On the one hand, the processing of the teeth is simpler and the difficulty of processing is reduced. On the other hand, the tooth number density can be set higher, which is beneficial to increase the speed. The induction accuracy of the inductor 600, at the same time, because the permanent magnet 700 is installed on the mounting frame 400 and away from the deformable part 300, can reduce the magnetization influence of the permanent magnet 700 on the deformable part 300, reduce the interference to the torque inductor 800, thereby helping to improve The sensing accuracy of the torque sensor 800 .

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, within the scope of knowledge possessed by those of ordinary skill in the art, various modifications can be made without departing from the spirit of the present invention. Variety.

Claims (12)

1. Moment and speed sensing device, its characterized in that includes:

the middle shaft is rotatably arranged in the five-way pipe and is provided with an induction tooth part, and the induction tooth part comprises a plurality of teeth which are uniformly distributed along the circumferential direction of the outer wall of the middle shaft;

the connecting piece is sleeved on the periphery of the middle shaft and used for transmitting power to the chain wheel;

one end of the deformation piece is fixedly connected with the middle shaft, and the other end of the deformation piece is fixedly connected with the connecting piece;

the mounting frame is fixedly arranged in the five-way pipe and sleeved on the periphery of the deformation piece;

the signal processing circuit board is arranged on the mounting rack;

the speed inductor is arranged on the signal processing circuit board and is opposite to the induction tooth part;

the permanent magnet is arranged on one side, away from the speed sensor, of the signal processing circuit board, and the speed sensor is used for sensing the change of a magnetic field of the permanent magnet and transmitting a speed signal to the signal processing circuit board;

and the torque sensor is arranged on the mounting frame and used for sensing the deformation of the deformation piece so as to transmit a torque signal to the signal processing circuit board.

2. The torque and speed sensing device according to claim 1, further comprising a shield covering an outer periphery of the torque sensor.

3. The torque and speed sensor according to claim 2, wherein the outer wall of the mounting bracket is provided with protrusions at both axial ends of the torque sensor, and the shield is clamped between the two protrusions.

4. The torque and speed sensing device according to claim 1, wherein the torque sensor comprises two induction coils, the outer wall of the mounting bracket is provided with two annular grooves, and the two induction coils are mounted in the corresponding annular grooves.

5. The torque and speed sensing device according to claim 4, wherein the torque sensor further comprises a connecting wire, the induction coil is connected with the signal processing circuit board through the connecting wire, and an avoiding groove for avoiding the connecting wire is provided on an outer wall of the mounting frame.

6. The torque and speed sensing device according to claim 1 wherein said mounting bracket is provided with a recess, said speed sensor being embedded in said recess.

7. The torque and speed sensing device according to claim 1, further comprising a first mounting seat and a second mounting seat, wherein the first mounting seat and the second mounting seat are mounted at two axial ends of the five-way pipe, the middle shaft is rotatably mounted on the first mounting seat through a first bearing, and the connecting member is rotatably mounted on the second mounting seat through a second bearing.

8. The torque and speed sensing device according to claim 7, wherein a clamping groove is formed in an inner wall of the first mounting seat, a rib is formed in an outer wall of the mounting frame, and the mounting frame is circumferentially fixed to the first mounting seat through the rib clamped in the clamping groove.

9. The torque and speed sensor according to claim 8, wherein the outer wall of the deformation member is provided with a boss, the outer wall of the middle shaft is provided with a limiting member, and the mounting bracket is clamped between the boss and the limiting member.

10. The torque and speed sensor according to claim 1, wherein the outer wall of the middle shaft is provided with a mounting tooth portion, and the inner wall of the deformation member is provided with a mating tooth portion which mates with the mounting tooth portion.

11. The torque and speed sensing device according to claim 10, wherein a stop ring is further disposed on an outer wall of the bottom bracket shaft, and the stop ring is located between the mounting teeth and the sensing teeth.

12. Electric bicycle, characterized in that it comprises a torque and speed sensing device according to any of claims 1 to 11.

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