CN217348062U - Torque sensor for moped - Google Patents

Abstract

The utility model discloses a torque sensor for moped. The technical scheme of the utility model is that: the torque ring comprises a shell with a sleeve and capable of penetrating through a standard five-way pipe, a middle shaft capable of being mounted on a common bicycle crank, a five-jaw chuck connected with a chain wheel, a torque ring fixed on a middle shaft flange, a slip ring for transmitting signals, a bearing for supporting the middle shaft and an external waterproof dustproof cover, wherein the torque ring comprises a torque ring inner ring and a torque ring outer ring, a magnetic steel is mounted on the outer circle of the torque ring inner ring, a Hall sensing element is mounted at a corresponding position of the torque ring outer ring, the torque ring inner ring generates relative displacement relative to the torque ring outer ring under the action of torque, and the magnetic steel also generates displacement relative to the Hall element. The utility model provides a scheme system integrated level is high, the installation is all very simple and system response is fast with the use, and sensitivity is high, and the impression of riding is good, and system cost is controllable.

Description

Moment sensor for moped

Technical Field

The utility model relates to a torque sensor technical field, in particular to torque sensor for moped.

Background

With the gradual enhancement of environmental protection consciousness and health consciousness of people, the bicycle as an environment-friendly and convenient short-distance vehicle reenters the visual field of the public and becomes a unique visible scenery everywhere in a city. In recent years, compared with the traditional bicycle, the electric power-assisted bicycle is favored by more and more people in the field of bicycles due to the characteristics of labor saving and energy saving. The commonly used power-assisted motor of the electric power-assisted bicycle at present mainly comprises two forms of a middle-mounted motor and a hub motor, wherein the middle-mounted motor integrates a motor, a speed reducing mechanism, a torque sensor and control into a whole generally, and simultaneously considers factors such as installation, power input and output and the like, so that the structure is more complex and the price is high; the hub motor generally integrates the motor and the speed reduction, and structurally considers the requirement of mounting on front and rear wheels, so that the hub motor has the advantages of relatively simple structure, low cost and high market popularity. According to the signal type of the sensor, the electric power assisting type can be divided into a rotating speed induction type and a torque induction type, and the torque-assisted power-assisted bicycle is popular in the market due to the characteristic of quick response to the treading force. Therefore, a special torque sensor is needed to match with the massive application of the hub motor so as to meet the requirement of the development of the market technical characteristics of the electric power-assisted bicycle.

The existing wheel hub motor power-assisted mode adopts a plurality of rotating speed induction type sensors, and the main reason is that the rotating speed sensors have the advantages of small structure, low cost, convenience in installation and the like, and the application amount in the market is large. But because of the signal characteristics of the rotating speed sensor, the power assistance is lagged, the control principle of the power assistance is unreasonable, and the riding feeling is poor. Moment induction type sensor has better response speed, and the helping hand control principle is reasonable, and it is good to ride the impression, but current moment sensor generally has more complicated structure and signal transmission mode, and the reliability and the life-span of sensor are lower, and the mounting structure of sensor is also complicated, require high, and overall cost is high, and market application volume is lower.

The common position of the torque sensor mounted on the vehicle is a five-way pipe, a chain wheel or a position on a frame connected with a chain. The torque sensor installed in the standard five-way pipe has the advantages of compact space, large stress, high requirements on structure and materials, high processing precision, large manufacturing difficulty and high general cost. The torque sensor installed on the chain wheel has the characteristics of small space and large stress, and simultaneously has the problems of signal transmission, complex structure and higher cost. The torque sensor arranged at other positions of the frame connected with the chain has the advantage of installation position, but the response speed of stress and deformation of the chain is slightly reduced, so that the sensitivity of the sensor is reduced, and meanwhile, higher requirements are provided for the installation of the chain and the frame, thereby influencing the use effect of the sensor.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art exists, the utility model discloses a main aim at provides a system integrated level height, installation and use all very simple and system response are fast, and sensitivity is high, and it feels to ride, the controllable disk torque sensor of system cost.

In order to achieve the above purpose, the utility model provides a following technical scheme: a torque sensor for a power-assisted bicycle comprises a shell with a sleeve and capable of penetrating through a standard five-way pipe, a middle shaft capable of being mounted on a crank of a common bicycle, a five-jaw chuck connected with a chain wheel and a chain wheel, a torque ring fixed on a middle shaft flange, a slip ring for transmitting signals, a bearing for supporting the middle shaft and an external waterproof dust cover, wherein the torque ring comprises a torque ring inner ring and a torque ring outer ring, magnetic steel is mounted on the outer circle of the torque ring inner ring, a Hall sensing element is mounted at a corresponding position of the torque ring outer ring, the torque ring inner ring generates relative displacement relative to the torque ring outer ring under the action of torque, and the magnetic steel also generates displacement relative to the Hall element.

Preferably, the torque ring is provided with a pair of slip ring pairs, each slip ring pair consists of a slip ring rotating disc and a slip ring fixing disc, the slip ring rotating discs and the slip ring fixing discs are in sliding connection through a conductive contact, and the electric signals are transmitted to the slip ring fixing discs through the slip ring rotating discs. A slip ring rotating disc of the slip ring pair is fixed with the torque ring, the contact state is not changed in the relative rotation process, a torque signal is transmitted to the motor controller through a signal wire harness connected with the slip ring fixing disc, and meanwhile, a controller power supply is connected into the Hall sensing element.

Preferably, a plurality of magnetic steels are installed on the outer circle edge of the slip ring rotating disc, and the Hall sensing elements are installed on corresponding positions of the slip ring fixing part.

Preferably, the outer ring of the torque ring is further provided with a pin which is inserted into a pin hole in the corresponding position of the sensor chuck, the pin is in clearance fit with the pin hole, the treading torque on the torque ring is transmitted to the chuck, the chuck is provided with 5 claws which are connected with the corresponding structure of the chain wheel and the chain wheel, and the driving chain moves to realize power transmission.

Preferably, a hole is formed in the middle of a five-jaw chuck of the sensor and is matched with the middle shaft, so that the chuck and the middle shaft form a sliding rotation pair.

Compared with the prior art, the utility model following advantage has, this patent is to the technical problem that current torque sensor exists, has designed a principle and structure all simpler, a disk torque sensor that the system integration level is high. The bicycle can be installed on a standard five-way switch of a traditional bicycle, can be matched with a hub motor for use, can provide a treading moment and a treading frequency signal, and is suitable for different requirements of driving control of a front wheel, a rear wheel, a double-wheel hub motor and the like. The structure of this patent is applicable in various bicycle models, uses traditional bicycle crank to be connected through the chain wheel of five-jaw structure and different tooth counts, the installation is all very simple with the use. This patent sensor has that system response is fast, and sensitivity is high, and the impression of riding is good, characteristics such as system cost is controllable realize low-cost in-wheel motor system and match torque sensor, gain better electric power control effect and the good experience of riding.

Drawings

FIG. 1 is a cross-sectional view of a disk torque sensor;

FIG. 2 is a front side view of a disk torque sensor;

FIG. 3 is a back side view of a disk torque sensor;

FIG. 4 is a view of a torque ring configuration and its installation in a transducer;

FIG. 5 shows an inner slip ring pair structure of the torque sensor;

FIG. 6 is a chuck assembly of the disk torque sensor;

FIG. 7 is a mounting diagram of a disc torque sensor on a vehicle frame;

FIG. 8 is a mounting diagram of a disc type torque sensor in a five-way pipe of a frame;

FIG. 9 is a rear side view of a second version of a disk torque sensor;

fig. 10 is an overall assembly diagram of a second aspect disc torque sensor.

In the figure: 1. a disc torque sensor assembly; 1a, a middle shaft; 1b, a middle shaft flange; 1c, matching surfaces of the middle shaft, the torque ring and the five-jaw chuck; 2. a deep groove ball bearing; 3. tightening threads on the housing sleeve; 4. a sensor housing; 4a, a housing sleeve portion; 5. a housing disc portion; 5a, a corrugated plate surface on the back of the shell disc; 5b, an outer ring end face of the shell disc part; 6. a sprocket chain wheel; 6a, a dust cover; 7. a chuck assembly with a sprocket; 7a, a chain wheel chain guard cover; 8. the chain wheel, the chain guard cover and the five-jaw chuck are connected by rivets; 9. a seal ring; 10. a moment ring; 10 a-a moment ring hall sensing element; 10 b-magnetic steel on the inner ring of the torque ring; 10c, a force transmission pin arranged on the outer ring of the torque ring; 10d, an outer ring of the torque ring; 10e, an inner ring of the moment ring; 10f, screw holes for connecting the torque ring and the middle shaft flange; 10g, a threaded hole for connecting the torque ring and the slip ring rotating disc; 10h, a circular hole is formed in the torque ring and the middle shaft in a rotating fit mode; 11. a five-jaw chuck; 11a, an outer ring of the five-jaw chuck; 11b, five-jaw chuck pin holes; 11c, a sealing groove matched with the five-jaw chuck and the middle shaft; 11d, claws connected with the five-claw chuck, the chain wheel and the chain wheel chain guard cover; 11e, a matching hole of the five-jaw chuck and the middle shaft; 12. a clamp spring; 13. a slip ring pair; 13a, a slip ring fixing disc; 13b, a slip ring rotating disc; 13c, magnetic steel arranged on the outer ring of the slip ring rotating disc; 13d, a slip ring rotating disc outer ring; 13e, a slip ring rotating disc slideway; 13f, a threaded hole for connecting the slip ring rotating disc with the torque ring; 13g, a slip ring fixed disc contact; 13h, fixing a conducting ring by a slip ring; 13j, a slip ring fixed disk speed module; 20. installing and screwing a special nut; 21. a bicycle frame; 22. a bicycle crank; 23. a standard five-way tube of a bicycle; 24. sensor body assembly.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, a torque sensor for a power-assisted bicycle comprises a housing with a sleeve and capable of passing through a standard five-way tube, a center shaft capable of being mounted on a crank of a common bicycle, a five-jaw chuck connected with a sprocket wheel, a torque ring fixed on a flange of the center shaft, a slip ring for transmitting signals, a bearing for supporting the center shaft and an external waterproof dust cover, wherein the torque ring comprises an inner ring of the torque ring and an outer ring of the torque ring, a magnetic steel is mounted on the outer circle of the inner ring of the torque ring, a hall sensing element is mounted at a position corresponding to the outer ring of the torque ring, the inner ring of the torque ring generates relative displacement with respect to the outer ring of the torque ring under the action of torque, and the magnetic steel also generates displacement with respect to the hall element.

Preferably, the torque ring is provided with a pair of slip ring pairs, each slip ring pair consists of a slip ring rotating disc and a slip ring fixing disc, the slip ring rotating discs and the slip ring fixing discs are in sliding connection through a conductive contact, and the electric signals are transmitted to the slip ring fixing discs through the slip ring rotating discs. A slip ring rotating disc of the slip ring pair is fixed with the torque ring, the contact state is not changed in the relative rotation process, a torque signal is transmitted to the motor controller through a signal wire harness connected with the slip ring fixing disc, and meanwhile, a controller power supply is connected into the Hall sensing element.

Preferably, a plurality of magnetic steels are installed on the outer circle edge of the slip ring rotating disc, and the Hall sensing element is arranged on the corresponding position of the slip ring fixing part.

Preferably, the outer ring of the torque ring is further provided with a pin which is inserted into a pin hole in the corresponding position of the sensor chuck, the pin is in clearance fit with the pin hole, the treading torque on the torque ring is transmitted to the chuck, the chuck is provided with 5 claws which are connected with the corresponding structure of the chain wheel and the chain wheel, and the driving chain moves to realize power transmission.

Preferably, a hole is formed in the middle of a five-jaw chuck of the sensor and is matched with the middle shaft, so that the chuck and the middle shaft form a sliding rotation pair.

Fig. 1 to 8 are structural views of a first embodiment, which is mainly composed of a center shaft 1a, a sensor housing 4, a chuck assembly 7 with a sprocket, and a dust cover 6a in appearance. The internal structure shown in fig. 1 mainly comprises a housing sleeve 4a which can pass through a standard five-way pipe 23, a middle shaft 1a which can be provided with a common bicycle crank 22, a five-jaw chuck 11 which is connected with a chain wheel 6 and a chain wheel protective cover 7a, a torque ring 10 which is fixed on a middle shaft flange 1b, a slip ring pair 13 (consisting of a slip ring fixed disc 13a and a slip ring rotating disc 13 b) which transmits signals, a deep groove ball bearing 2 which supports the middle shaft 1a, a waterproof sealing ring 9 which is arranged on the outer ring of the five-jaw chuck 11 and the like. As can be seen from the mounting appearance shown in fig. 7 and 8, the sensor assembly 1 is mounted in a standard five-way tube 23 of the frame 22 and is screwed tight by screwing the nut 20 on the housing thread 3. Two ends of a middle shaft 1a of the sensor are provided with common bicycle cranks 23, the manpower is used for inputting torque into the sensor by treading the cranks 23, and the driving force is output to a chain by a chain wheel 6 on the sensor to realize power transmission.

Rotatable deep groove ball bearings 2 are respectively mounted at two ends of a position, matched with a casing sleeve part 4a, of an internal middle shaft 1a of the sensor shown in figures 1, 2 and 3, so that the middle shaft is axially constrained in the sleeve 4a and can only rotate. A middle shaft flange 1b is arranged on the outer side of the position of the rotary deep groove ball bearing 2, close to the right side (as shown in figure 7, the head of the bicycle is forward, the sensor 1 is arranged on a five-way pipe 23, and the chain wheel 6 is positioned on the right side of the frame 22), on the middle shaft 1a, and the position is shown in figure 5. As shown in fig. 4 and 5, 5 screws are inserted through the screw holes 10f of the torque ring inner ring 10e and connected to the center shaft flange 1b, and the pedaling torque on the crank 23 is transmitted to the torque ring outer ring 10d through the center shaft 1 a. The moment ring 10 is made of special material, and is designed with an inner ring 10e and an outer ring 10d, and a magnetic steel 10b is installed on the outer circle of the inner ring 10e, and a hall sensing element 10a is installed on the outer ring 10d corresponding to the position. Under the action of torque, the inner ring 10e generates relative displacement relative to the outer ring 10d, and the magnetic steel 10b also generates displacement relative to the hall element 10 a. The hall element 10a senses the change of the magnetic field and outputs a corresponding voltage value, which is a torque signal.

In order to facilitate the moment ring 10 in rotation to transmit the generated moment signal, a pair of slip ring pairs 13 are mounted on the moment ring 10, as shown in fig. 5. The slip ring rotor 13b of the slip ring pair 13 is fixed to the torque ring 10 by the screw hole 13f thereof, and the slip ring stator 13a is fixed inside the housing disk section 5. The slip ring fixing part 5 is internally designed with a conductive ring 13h, which is connected with a slip ring fixed disc contact 13g and is contacted with a slide way 13e of the slip ring rotating part 13 b. The contact 13g and the slideway 13e of the slip ring are made of special conductive metal materials, have the characteristics of conductivity, wear resistance and the like, can transmit the torque signal of the torque ring 10, transmit the torque signal to a motor controller through a wire harness connected with the conductive ring 13h of the slip ring fixed disk, and simultaneously connect the power supply of the controller into the Hall element 10 a. The outer ring 13d of the slip ring pair rotating disc is provided with a plurality of magnetic steel 13c, and meanwhile, the corresponding speed module 13j is arranged at the corresponding position in the shell disc part 5. When the slip ring rotating part 13b rotates together with the torque ring 10, the speed module 13j detects the repeated change of the magnetic field of the slip ring rotating disk magnetic steel 13c and generates a changed signal, which is a pedaling frequency signal. The signal is directly transmitted to the controller through the wire harness, and the pedaling frequency of the manual pedaling bicycle is calculated.

In order to ensure the torque transmission and the stress reliability and stability of the sensor, as shown in fig. 6, the torque is transmitted to the torque ring 10 through the middle shaft flange 1b, a pin 10c is installed on the outer ring 10d of the torque ring and inserted into a pin hole 11b on the corresponding position of the five-jaw chuck 11 of the sensor, and the pin 10c is in clearance fit with the pin hole 11b to transmit the treading torque on the torque ring 10 to the five-jaw chuck 11. The chuck is provided with 5 claws 11d which are connected with corresponding structures of a chain wheel 6 and a chain wheel chain guard cover 7a through rivets 8, and the chain on the driving chain wheel moves to realize power transmission. The five-jaw chuck 11 of the sensor is provided with an opening 11e in the middle, and is matched with the shaft surface 1c at the corresponding position of the middle shaft 1a, as shown in fig. 5, so that the chuck and the middle shaft form a sliding rotation pair, and are constrained by a snap spring 12 on the middle shaft, and only can rotate but cannot axially slide on the middle shaft 1 a. The clearance fit of the chuck 11 and the middle shaft 1a also ensures that the torque ring 10 only bears the torque effect and is free from the effect of other interference forces, thereby greatly improving the anti-interference capability of the sensor, ensuring the stress stability and reliability of the torque ring 10 and the chuck 11, and improving the signal quality and the service life of the system.

In order to ensure the sealing, waterproof and dustproof capabilities of the sensor, the outer circular surface of the chuck outer ring 11a is designed with a structure of a sealing ring 9, so that the sealing ring 9 and the end surface 5b of the shell fixed disk outer ring form a sealing friction pair, and the dustproof and waterproof of the shell 4 are realized. A sealing groove 11c is designed in an inner hole of the chuck 11, as shown in fig. 6, a sealing pair is formed by cylindrical surfaces corresponding to the middle shaft 1a after a sealing ring is installed, and sealing and water proofing of the middle shaft 1a of the sensor are guaranteed. In addition, install dust cover 6a on the five-jaw position of chuck 11, cover the outer disc of sensor casing disc portion 5 and keep the little clearance to prevent that rainwater and dust from directly getting into the sensor inside, form the protection and the seal structure of sensor, and holistic encapsulation appearance, the transportation, transport and the installation etc. of the sensor of being convenient for ensure the stability and the leakproofness of sensor inner structure.

When the disc torque sensor is installed, the sensor sleeve part 4a is directly inserted into the standard five-way pipe 23 of the bicycle and then locked by the special nut 20 at the other side, as shown in fig. 7 and 8. The back of the sensor shell disc part 5 is provided with a corrugated disc surface 5a, the end part of the shell sleeve part 4a is designed with an external thread 3, a tightening nut 20 is arranged on the external thread 3, the end surface of the five-way pipe 23 and the corrugated disc surface 5a are pressed and clamped, and the sensor is prevented from rotating in the five-way pipe 23. Before the special nut 20 for screwing the end part is installed, the sensor assembly 1 inserted into the five-way pipe 23 can rotate at will, a sensor wire outlet is positioned at a reasonable position on the circumference of the bicycle five-way pipe, the connection and the fixation of a wire harness are convenient, meanwhile, the appearance is attractive, and then the nut 20 is screwed to finish the installation.

After the disc type torque sensor is installed, the riding mode of the bicycle cannot be changed. The moment that the sensor provided and step on frequently the signal can provide the signal for the power control of preceding/back wheel hub motor, make power control sensitive, swift and comfortable more, improve greatly and ride and experience the sense.

The second scheme that this patent provided is designed based on current common axis external member and forms, mainly by right side bearing frame 15, middle sleeve 16 and the left side bearing frame 17 of standard axis external member in the appearance, external axis 1a, sensor disc portion 5, dust cover 6a and take the chuck assembly 7 of sprocket. The inner structure of the device is shown in fig. 9, and the device comprises a middle shaft 1a, a special bearing 19 on the middle shaft, a sensor disc part 5, a disc positioning deep groove ball bearing 14, a slip ring pair 13, a torque ring 10, a sealing ring 9, a chuck 7 and a left clamp spring and a right clamp spring. The internal structure of the sensor disk part 5 is the same as that of the first embodiment, and will not be described again. The back bayonet 5c of the sensor disc part 5 and the bayonet 15a of the right bearing seat 15 are designed to be matched structures, the two sides cannot rotate relatively after being clamped, and then a clamp spring is installed on the outer side of the left bearing 19, so that the shell fixing disc 5 and the whole sensor are fixed on a standard center shaft.

When the sensor is installed, the right sensor housing and its internal structure are assembled to form the sensor main body assembly 24, as shown in fig. 10, in which the added deep groove ball bearing 14 is installed in the inner hole of the housing disk part to ensure the rotation relationship between the housing disk part 5 and the middle shaft 1a and the axial positioning on the middle shaft 1 a. The right bearing block 15, the special bearing 19 and the middle axle sleeve 16 of the standard middle axle set are then installed into the standard bottom bracket 23 of the bicycle. The left bearing seat 15 and the right bearing seat 17 are both provided with special fine threads which are screwed with the internal threads at the two ends of the standard five-way. The sensor body assembly 24 is inserted into the inner hole of the bearing 19 until the bayonets 15a and 5c on both sides are engaged. And (3) installing a bearing inner retainer ring 18 on the middle shaft from the left side, installing a left special bearing 19 and a bearing seat 17, installing a clamp spring 12 on the left side of the middle shaft after the installation structure is in place, and completing the installation of the sensor.

The structure of the second solution is slightly changed during installation, but common bicycle components can be fully utilized, so that the cost of the system is further reduced, and the modification of the bicycle is also facilitated. In addition, the scheme and the first scheme have the same use characteristics, and the advantages of system matching are the same, so that the detailed description is omitted.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (5)

1. The utility model provides a moment sensor for moped which characterized in that: the torque ring comprises a shell with a sleeve and capable of passing through a standard five-way pipe, a middle shaft capable of being mounted on a crank of a common bicycle, a five-jaw chuck connected with a chain wheel and chain wheel, a torque ring fixed on a flange of the middle shaft, a slip ring for transmitting signals, a bearing for supporting the middle shaft and an external waterproof dustproof cover, wherein the torque ring comprises a torque ring inner ring and a torque ring outer ring, a magnetic steel is mounted on the outer circle of the torque ring inner ring, a Hall sensing element is mounted at a corresponding position of the torque ring outer ring, the torque ring inner ring generates relative displacement relative to the torque ring outer ring under the action of torque, and the magnetic steel also generates displacement relative to the Hall element.

2. The torque sensor according to claim 1, wherein: the torque ring is provided with a pair of slip ring pairs, each slip ring pair is composed of a slip ring rotating disc and a slip ring fixing disc, the slip ring rotating discs and the slip ring fixing discs are in sliding connection through a conductive contact, electric signals are transmitted to the slip ring fixing discs from the slip ring rotating discs, the slip ring rotating discs of the slip ring pairs are fixed with the torque ring, the contact state is not changed in the relative rotation process, the torque signals are transmitted to the motor controller through a signal wire harness connected with the slip ring fixing discs, and meanwhile, a power supply of the controller is connected into the Hall sensing element.

3. The torque sensor according to claim 2, wherein: and a plurality of magnetic steels are arranged on the excircle edge of the slip ring rotating disc, and Hall sensing elements are arranged at corresponding positions of the slip ring fixing part.

4. The torque sensor according to claim 3, wherein: the outer ring of the torque ring is further provided with a pin which is inserted into a pin hole in the corresponding position of the sensor chuck, the pin is in clearance fit with the pin hole, the treading torque on the torque ring is transmitted to the chuck, the chuck is provided with 5 claws which are connected with the corresponding structure of the chain wheel and the chain wheel, and the driving chain moves to realize power transmission.

5. The torque sensor according to claim 4, wherein: the middle of a five-jaw chuck of the sensor is provided with a hole and is matched with the middle shaft, so that the chuck and the middle shaft form a sliding rotation pair.

Images