Card base with torque sensor and hub motor assembling structure

Abstract

The utility model discloses a clamping base with a torque sensor and a hub motor assembly structure, which comprises a clamping base with a torque sensor, the clamping base is arranged on a motor shaft on the outer side of an end cover of a hub motor, and a hub bearing is arranged on the inner circumference of a shaft hole of the end cover and supported on the motor shaft; the clamping base comprises a clamping base shell rotationally assembled on the motor shaft; the hub motor is characterized in that an annular concave part located on the periphery of a shaft hole is formed in an end cover of the hub motor, the clamping base shell is provided with a flywheel placement part, a sensor placement part and an end cover connecting part which are sequentially arranged in the axial direction of the clamping base shell, and the inner circumference of the flywheel placement part is supported on a motor shaft through a plurality of clamping base bearings; the end cover connecting part extends into the annular concave part and is connected with the inner circumference of the annular concave part through a ratchet wheel and pawl one-way clutch located on the radial periphery of the hub bearing, and the torque sensor is installed on the sensor installation part and located between the hub bearing and the clamping base bearing. The assembly structure can reduce the axial size of the card base, so that the structure is more compact, and the torque sensor is easy to assemble and disassemble.

Description

Technical Field

[0001] The utility model relates to an assembly structure of a card base and a hub motor with a torque sensor. Background Art

[0002] The card base is the core component of an electric bicycle with a multi-speed transmission function. It is mainly assembled on the motor shaft outside the end cover of the hub motor and axially locked by a locking nut. In the current conventional card base and hub motor assembly structure, for the convenience of loading and unloading, an insert is usually fixed on the inner circumference of the shaft hole of the end cover of the hub motor. The inner side of the insert serves as a bearing seat to accommodate the hub bearing supported on the motor shaft. At the same time, the insert also has an extension sleeve extending into the inner side of the card base shell. The extension sleeve is connected and matched with the card base through a ratchet pawl one-way clutch. In this way, when the card base is disassembled, the pawl in the one-way clutch can be axially disengaged relative to the ratchet without interfering with the bearing inside the card base.

[0003] Due to the need for control component integration and compact design, many electric bicycles currently install the torque sensor on the bottom bracket to the base. This torque sensor uses strain gauges to detect the micro-deformation of the base shell caused by external pedal force, thereby obtaining the torque signal and transmitting it to the controller of the electric bicycle through the signal output component to control the speed. However, for the traditional assembly structure of the base and the hub motor mentioned above, the introduction of the torque sensor brings the following problems:

[0004] 1. The ratchet pawl one-way clutch and the hub bearing in the hub motor end cover are arranged along the axial direction of the motor shaft, so that the axial direction of the card base itself has a certain length. Now it is necessary to reserve space inside the card base shell between the two to install the torque sensor, which will obviously further lengthen the axial dimension of the card base, making it occupy a larger volume on the electric bicycle and the structure is not compact.

[0005] 2. To avoid the axial dimension of the card base being too long, some designs with torque sensors are currently designed to penetrate the motor sleeve inside the end cover of the hub motor, and the torque sensor is installed at the end position of the motor sleeve, but this makes the structure cumbersome and extremely inconvenient to install and repair. In addition, part of the PCB board, coil and corresponding bracket of the signal output component of the torque sensor need to be fixed to the motor shaft inside the hub motor, which requires the hub motor end cover to be disassembled for maintenance and replacement, which is inefficient and has high maintenance costs. Summary of the invention

[0006] The utility model aims to provide a card base and wheel hub motor assembly structure with a torque sensor, which can reduce the axial size of the card base, make its structure more compact, and facilitate the assembly and disassembly of the torque sensor.

[0007] The technical scheme of the utility model is: a card base and wheel hub motor assembly structure with a torque sensor, comprising a card base and a wheel hub motor provided with a torque sensor, the card base is installed on the motor shaft outside the end cover of the wheel hub motor, and the inner periphery of the end cover shaft hole is provided with a wheel hub bearing supported on the motor shaft; the card base comprises a card base shell rotatably assembled on the motor shaft; it is characterized in that an annular recessed portion located at the outer periphery of the shaft hole is provided on the end cover of the wheel hub motor, and the card base shell has a flywheel placement portion, a sensor placement portion and an end cover connecting portion sequentially arranged along its axial direction, wherein the inner periphery of the flywheel placement portion is supported on the motor shaft via a plurality of card base bearings, and the end cover connecting portion extends into the annular recessed portion, and its outer periphery is connected with the inner periphery of the annular recessed portion through a ratchet pawl one-way clutch, so that the ratchet pawl one-way clutch is located at the radial periphery of the wheel hub bearing, and the torque sensor is installed on the sensor placement portion, and the torque sensor is located between the wheel hub bearing and the card base bearing in the axial direction of the motor shaft.

[0008] Furthermore, the card base in the utility model also includes a motor shaft sleeve that is sleeved and circumferentially fixed on the motor shaft, and the card base shell is located outside the motor shaft sleeve and is supported on the motor shaft sleeve via the plurality of card base bearings.

[0009] Furthermore, in the utility model, a ratchet is fixed on the end cover connecting part, and an annular insert is fixed on the inner circumference of the annular recess by a thread, and a pawl connected and matched with the ratchet is provided on the inner circumference of the annular insert, and the ratchet and the pawl together constitute the ratchet-paw one-way clutch; or a pawl is fixed on the end cover connecting part, and an annular insert is fixed on the inner circumference of the annular recess by a thread, and a ratchet connected and matched with the pawl is provided on the inner circumference of the annular insert, and the ratchet and the ratchet together constitute the ratchet-paw one-way clutch.

[0010] Furthermore, the annular recess of the utility model is provided with an embedding groove on the inner circumference of its mouth to embed a sealing ring for sealing the inner cavity of the annular recess, thereby effectively preventing the ratchet pawl one-way clutch in the inner cavity of the annular recess from being contaminated and reducing the working reliability.

[0011] Furthermore, in the utility model, an outer annular partition is formed on the outer periphery of the card base shell to separate the sensor placement part and the end cover connecting part; and an inner annular partition is formed on the inner periphery of the card base shell to separate the sensor placement part and the flywheel placement part.

[0012] Furthermore, an example of the torque sensor in the utility model is composed of a signal acquisition unit arranged on the outer periphery of the sensor placement part and a signal output unit arranged on the inner periphery of the sensor placement part.

[0013] Furthermore, based on the structure of the card base provided with the motor shaft sleeve, the torque sensor in the utility model adopts the following more specific structure: the signal acquisition unit includes at least one strain gauge attached to the outer peripheral surface of the sensor placement part and a first signal acquisition PCB board electrically connected thereto, and when there are two or more strain gauges, they are evenly spaced and attached to the outer peripheral surface of the sensor placement part along the circumference, and are all electrically connected to the first signal acquisition PCB board; the signal acquisition unit also includes an annular cover fixed on the outer periphery of the sensor placement part to cover the strain gauge, and the first signal acquisition PCB board is fixed on the inner side of the annular cover;

[0014] The signal output unit includes an outer induction component and an inner induction component. The outer induction component includes an outer induction coil fixed to the inner periphery of the sensor placement part via an outer ring bracket and electrically connected to a first signal acquisition PCB board. The inner induction component includes an inner induction coil fixed to the motor shaft sleeve via an inner ring bracket and located on the inner side of the outer induction coil, and a second signal acquisition PCB board electrically connected to the inner induction coil. The lead wire of the second signal acquisition PCB board is led out from one end of the card base shell facing away from the hub motor; and a lead wire hole parallel to the motor shaft is opened on the motor shaft sleeve for the lead wire of the second signal acquisition PCB board to pass through.

[0015] Of course, the torque sensor in the present invention is not limited to the above-mentioned structural forms.

[0016] As in conventional technology, the flywheel placement part of the card base housing in the utility model is used to install a transmission mechanism flywheel, such as a pulley or a sprocket, and then connected to the pedal of the electric bicycle via a corresponding belt transmission mechanism or chain transmission mechanism. The lead wire of the second signal acquisition PCB board in the signal output unit is finally electrically connected to the controller of the electric bicycle.

[0017] When a person pedals the electric bicycle, the pedal force is transmitted to the card base shell (flywheel placement part) through the belt or chain transmission mechanism and drives the card base shell to rotate relative to the motor sleeve. The card base shell then transmits the pedal force to the hub motor end cover through the ratchet pawl one-way clutch on the end cover connection part and drives the hub motor to rotate. At the same time, the end cover of the hub motor will give the card base shell a corresponding pawl or ratchet reaction force through the ratchet or pawl set thereon. After the pawl or ratchet on the card base shell is stressed, its sensor placement part will produce a slight deformation, and the strain gauge will sense the slight deformation and output the corresponding electrical signal, i.e., the torque signal, through the first signal acquisition PCB board. The torque signal is then wirelessly transmitted to the second signal acquisition PCB board through the internal and external sensing components in the signal output unit, and finally output to the controller of the electric bicycle.

[0018] The advantages of the utility model are:

[0019] 1. In the assembly structure provided by the utility model, an annular recess is provided on the end cover of the hub motor for one end of the card base to extend into, ensuring that the ratchet pawl one-way clutch that cooperates with the card base and the end cover of the hub motor is placed on the radial periphery of the hub bearing, thereby ensuring that there is space for the torque sensor to be placed on the card base without lengthening the card base, and the torque sensor is installed between the hub bearing and the card base bearing. Obviously, compared with the prior art, this design can effectively reduce the axial size of the card base, reduce the volume occupied by the torque sensor, make the assembly structure of the card base and the hub motor more compact, and improve the appearance.

[0020] 2. In the assembly structure of the utility model, the torque sensor is arranged on the outside of the end cover of the hub motor, so there is no need to disassemble the end cover and go deep into the inside of the hub motor to install it as in conventional technology, and the installation position of the torque sensor will not affect and interfere with the axial disengagement between the card base and the hub motor. Therefore, the assembly and disassembly between the torque sensor and the card base, or between the card base and the hub motor are extremely convenient, which can effectively improve the assembly efficiency and reduce the maintenance cost.

[0021] 3. In the assembly structure of the utility model, the lead wire of the signal output unit of the torque sensor is led out from the end of the card base shell facing away from the hub motor, and is not combined with the wiring harness inside the hub motor. When the torque sensor needs to be tested or repaired separately, there is no need to perform cumbersome wiring harness separation operations, which can improve work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] Figure 1 This is the main cross-sectional view of the structure of the utility model;

[0024] Figure 2 for Figure 1 Cross-sectional view of the card base structure with torque sensor.

[0025] Wherein: 1. card base; 101. card base shell; 101a. flywheel placement part; 101b. sensor placement part; 101c. end cover connection part; 102. card base bearing; 103. motor shaft sleeve; 103a. lead hole; 2. torque sensor; 201. signal acquisition unit; 201a. strain gauge; 201b. first signal acquisition PCB board; 201c. annular cover; 202. signal output unit; 202a. outer ring bracket; 202b, outer induction coil; 202c, inner ring bracket; 202d, inner induction coil; 202e, second signal acquisition PCB board; 3, hub motor; 3a, end cover; 301, annular recess; 4, motor shaft; 5, hub bearing; 6, ratchet and pawl one-way clutch; 6a, ratchet; 6b, pawl; 7, annular insert; 8, sealing ring; 9, annular outer partition; 10, outer inner partition; 11, lead wire; 12, transmission mechanism flywheel. DETAILED DESCRIPTION

[0026] Example: The following combination Figure 1~Figure 2 The specific implementation of the assembly structure of the card base and the hub motor with a torque sensor provided by the utility model is described as follows:

[0027] The assembly structure comprises a base 1 provided with a torque sensor 2 and a hub motor 3. As in the known art, the base 1 is mounted on the motor shaft 4 outside the end cover 3a of the hub motor 3, and the inner circumference of the shaft hole of the end cover 3a is provided with a hub bearing 5 supported on the motor shaft 4. The base 1 is composed of a base housing 101, a base bearing 102 and a motor sleeve 103. The motor sleeve 103 is sleeved and circumferentially fixed on the motor shaft 4, and the base housing 101 is located outside the motor sleeve 103.

[0028] The core improvement of the utility model is that: the end cover 3a of the wheel hub motor 3 is provided with an annular recess 301 located at the periphery of the shaft hole, and the card base housing 101 has a flywheel placement part 101a, a sensor placement part 101b and an end cover connection part 101c arranged in sequence along its axial direction. Figure 1 As shown, the outer periphery of the flywheel placement part 101a is used to install the transmission mechanism flywheel 12, which is a sprocket in this embodiment, and is further connected to the pedal of the electric bicycle via a chain transmission mechanism, while the inner periphery of the flywheel placement part 101a is supported on the motor shaft 4 via two side-by-side said card base bearings 102. The end cover connecting part 101c extends into the annular recess 301, and its outer periphery is connected to the inner periphery of the annular recess 301 through a ratchet pawl one-way clutch 6, so that the ratchet pawl one-way clutch 6 is located at the radial periphery of the hub bearing 5, and the torque sensor 2 is installed on the sensor placement part 101b, and the torque sensor 2 is located between the hub bearing 5 and the card base bearing 102 in the axial direction of the motor shaft 4.

[0029] Further integration Figure 1 and Figure 2 As shown, in this embodiment, a pawl 6b is fixed on the end cover connecting portion 101c, and an annular insert 7 is fixed to the inner circumference of the annular recess 301 by thread. The inner circumference of the annular insert 7 is integrally formed with a ratchet 6a connected to and cooperated with the pawl 6b. The pawl 6b and the ratchet 6a together constitute the ratchet pawl one-way clutch 6.

[0030] And if Figure 1 As shown, the annular recess 301 in this embodiment is provided with an embedding groove on the inner periphery of its mouth to embed the sealing ring 8 for sealing the inner cavity of the annular recess 301. This effectively prevents the ratchet pawl one-way clutch 6 in the inner cavity of the annular recess 301 from being contaminated and reducing the working reliability.

[0031] At the same time, in this embodiment, an annular outer partition 9 is formed on the outer periphery of the card base shell 101 to separate the sensor placement part 101b and the end cover connecting part 101c; and an annular inner partition 10 is formed on the inner periphery of the card base shell 101 to separate the sensor placement part 101b and the flywheel placement part 101a.

[0032] Specific combination Figure 1 and Figure 2 As shown, the torque sensor 2 in this embodiment is specifically composed of a signal acquisition unit 201 arranged on the outer periphery of the sensor placement portion 101b and a signal output unit 202 arranged on the inner periphery of the sensor placement portion 101b.

[0033] The signal acquisition unit 201 includes two strain gauges 201a attached to the outer peripheral surface of the sensor placement part 101b and a first signal acquisition PCB board 201b electrically connected thereto. In this embodiment, the two strain gauges 201a are evenly spaced along the circumference and attached to the outer peripheral surface of the sensor placement part 101b, and are both electrically connected to the first signal acquisition PCB board 201b. The first signal acquisition PCB board 201b is made of a flexible substrate and can be bent into an arc. The signal acquisition unit 201 also includes an annular cover 201c fixed on the outer periphery of the sensor placement part 101b to cover the strain gauges 201a, and the first signal acquisition PCB board 201b is fixed inside the annular cover 201c.

[0034] The signal output unit 202 includes an outer induction component and an inner induction component. The outer induction component includes an outer induction coil 202b fixed to the inner periphery of the sensor placement portion 101b via an outer ring bracket 202a and electrically connected to the first signal acquisition PCB board 201b, and the inner induction component includes an inner induction coil 202d fixed to the motor sleeve 103 via an inner ring bracket 202c and located on the inner side of the outer induction coil 202b, and a second signal acquisition PCB board 202e electrically connected to the inner induction coil 202d, the lead wire 11 of the second signal acquisition PCB board 202e is led out from one end of the card base shell 101 facing away from the hub motor 3; and a lead wire hole 103a parallel to the motor shaft 4 is opened on the motor sleeve 103 for the lead wire 11 of the second signal acquisition PCB board 202e to pass through.

[0035] In the assembly structure provided by the utility model, an annular recess 301 for one end of the base 1 to extend into is provided on the end cover 3a of the hub motor 3, ensuring that the ratchet pawl one-way clutch 6 that cooperates with the base 1 and the end cover 3a of the hub motor 3 is placed on the radial periphery of the hub bearing 5, thereby ensuring that the placement space of the torque sensor 2 is reserved on the base 1 without lengthening the base 1, and the torque sensor 2 is installed between the hub bearing 5 and the base bearing 102. Obviously, compared with the prior art, this design can effectively reduce the axial size of the base 1, reduce the volume occupied by the torque sensor 2, make the assembly structure of the base 1 and the hub motor 3 more compact, and improve the appearance.

[0036] Secondly, in the above-mentioned assembly structure of the utility model, the torque sensor 2 is arranged on the outside of the end cover 3a of the hub motor 3, so there is no need to disassemble the end cover 3a and penetrate into the inside of the hub motor 3 to implement the installation as in the conventional technology, and the installation position of the torque sensor 2 will not affect and interfere with the axial disengagement between the card base 1 and the hub motor 3, so the assembly and disassembly between the torque sensor 2 and the card base 1, or between the card base 1 and the hub motor 3 are extremely convenient, which can effectively improve the assembly efficiency and reduce the maintenance cost.

[0037] Finally, in the assembly structure of the present invention, the lead wire 11 of the signal output unit 202 of the torque sensor 2 is led out from the end of the card base shell 101 facing away from the hub motor 3, and is not combined with the wiring harness inside the hub motor 3. When the torque sensor 2 needs to be tested or repaired separately, there is no need to perform cumbersome wiring harness separation operations, which can improve work efficiency.

[0038] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A mounting structure of a base and a hub motor with a torque sensor, comprising a base (1) provided with a torque sensor (2) and a hub motor (3), wherein the base (1) is mounted on a motor shaft (4) outside an end cover (3a) of the hub motor (3), and a hub bearing (5) supported on the motor shaft (4) is provided on the inner periphery of the shaft hole of the end cover (3a); the base (1) comprises a base housing (101) rotatably mounted on the motor shaft (4); and characterized in that An annular recess (301) located at the periphery of the shaft hole is provided on the end cover (3a) of the hub motor (3), and the base housing (101) has a flywheel placement portion (101a), a sensor placement portion (101b) and an end cover connection portion (101c) arranged in sequence along its axial direction, wherein the inner periphery of the flywheel placement portion (101a) is supported on the motor shaft (4) via a plurality of base bearings (102), and the end cover connection portion (101c) extends into the annular recess (301), and its outer periphery is connected to the inner periphery of the annular recess (301) via a ratchet pawl one-way clutch (6), so that the ratchet pawl one-way clutch (6) is located at the radial periphery of the hub bearing (5), and the torque sensor (2) is mounted on the sensor placement portion (101b), and the torque sensor (2) is located between the hub bearing (5) and the base bearing (102) in the axial direction of the motor shaft (4).

2. The assembly structure of the card base and the hub motor with a torque sensor according to claim 1 is characterized in that The card base (1) further comprises a motor shaft sleeve (103) sleeved and circumferentially fixed on the motor shaft (4); the card base housing (101) is located outside the motor shaft sleeve (103) and is supported on the motor shaft sleeve (103) via the plurality of card base bearings (102).

3. The assembly structure of the card base and the hub motor with a torque sensor according to claim 1 is characterized in that A ratchet (6a) is fixed on the end cover connecting portion (101c), and an annular insert (7) is fixed on the inner circumference of the annular recess (301) by a thread, and a ratchet (6b) connected and matched with the ratchet (6a) is provided on the inner circumference of the annular insert (7), and the ratchet (6a) and the ratchet (6b) together constitute the ratchet-pawl one-way clutch (6); or a ratchet (6b) is fixed on the end cover connecting portion (101c), and an annular insert (7) is fixed on the inner circumference of the annular recess (301), and a ratchet (6a) connected and matched with the ratchet (6b) is provided on the inner circumference of the annular insert (7), and the ratchet (6b) and the ratchet (6a) together constitute the ratchet-pawl one-way clutch (6).

4. The assembly structure of the card base and the hub motor with a torque sensor according to claim 1 is characterized in that The annular recess (301) is provided with an embedding groove on the inner periphery of its mouth for embedding a sealing ring (8) for sealing the inner cavity of the annular recess (301).

5. The assembly structure of the card base and the hub motor with a torque sensor according to claim 1 is characterized in that An annular outer partition (9) is formed on the outer periphery of the card base housing (101) to separate the sensor placement portion (101b) and the end cover connection portion (101c); and an annular inner partition (10) is formed on the inner periphery of the card base housing (101) to separate the sensor placement portion (101b) and the flywheel placement portion (101a).

6. The assembly structure of the card base and the hub motor with a torque sensor according to claim 2 is characterized in that The torque sensor (2) is composed of a signal acquisition unit (201) arranged on the outer periphery of the sensor placement portion (101b) and a signal output unit (202) arranged on the inner periphery of the sensor placement portion (101b).

7. The assembly structure of the card base and the hub motor with a torque sensor according to claim 6 is characterized in that The signal acquisition unit (201) comprises at least one strain gauge (201a) attached to the outer peripheral surface of the sensor placement part (101b) and a first signal acquisition PCB board (201b) electrically connected thereto, and when there are two or more strain gauges (201a), they are evenly spaced along the circumference and attached to the outer peripheral surface of the sensor placement part (101b) and are electrically connected to the first signal acquisition PCB board (201b); the signal acquisition unit (201) further comprises an annular cover (201c) fixed on the outer periphery of the sensor placement part (101b) to cover the strain gauge (201a), and the first signal acquisition PCB board (201b) is fixed on the inner side of the annular cover (201c); The signal output unit (202) comprises an external induction component and an internal induction component, the external induction component comprising an external induction coil (202b) fixed to the inner periphery of the sensor placement portion (101b) via an external ring bracket (202a) and electrically connected to a first signal acquisition PCB board (201b), and the internal induction component comprising an internal induction coil (202d) fixed to the motor shaft sleeve (103) via an internal ring bracket (202c) and located inside the external induction coil (202b), and a second signal acquisition PCB board (202e) electrically connected to the internal induction coil (202d), wherein a lead wire (11) of the second signal acquisition PCB board (202e) is led out from one end of the card base housing (101) facing away from the hub motor (3); and a lead wire hole (103a) parallel to the motor shaft (4) is provided on the motor shaft sleeve (103) for the lead wire (11) of the second signal acquisition PCB board (202e) to pass through.

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