CN220829303U

CN220829303U - Moment sensor system and booster bicycle

Info

Publication number: CN220829303U
Application number: CN202322625299.7U
Authority: CN
Inventors: 韩德玮; 宋海鹏; 刘国平; 文辉耀
Original assignee: Dahang Science And Technology Shenzhen Co ltd
Current assignee: Dahang Science And Technology Shenzhen Co ltd
Priority date: 2023-09-25
Filing date: 2023-09-25
Publication date: 2024-04-23
Anticipated expiration: 2033-09-25

Abstract

The utility model relates to a torque sensor system and a booster bicycle, comprising: a five-way component; the first bearing and the middle shaft penetrate through the five-way assembly and can rotate relative to the five-way assembly around a rotation axis through the first bearing; a first movable gap is formed between the outer peripheral surface of the first bearing and the inner surface of the five-way assembly; the transmission piece and the strain gauge are arranged between the first bearing and the strain gauge in the radial direction of the center shaft; when the middle shaft drives the first bearing to move along the radial direction relative to the five-way assembly, the transmission piece can transmit acting force to the strain gauge. The strain gauge is not directly attached to the central shaft any more, but a first movable gap is formed between the outer surface of the first bearing and the inner surface of the five-way component, the transmission piece is arranged between the first bearing and the strain gauge, and the movement of the central shaft is transmitted to the strain gauge through the first bearing and the transmission piece, so that the torque sensor system can be connected with the main control circuit in a wired mode, the structure is simple, and the production cost is reduced.

Description

Moment sensor system and booster bicycle

Technical Field

The utility model relates to the technical field of boosting, in particular to a torque sensor system and a boosted bicycle.

Background

The power-assisted bicycle is a novel vehicle, takes a battery as an auxiliary power source, is provided with a motor, is provided with a power auxiliary system, and can realize the integration of manpower riding and motor power assistance.

The torque sensor is used as a core component of the power-assisted bicycle, can sense the pedaling torque and the pedaling frequency of the bicycle in real time, and is used as an input signal of the electric power-assisted system, so that the system outputs electric power in strict proportion to the pedaling power of a rider at a high speed.

In the prior art, the torque sensor needs to attach the sensing device and the amplifying circuit thereof to the central shaft, and because the central shaft is a rotating part, the power supply and the output signal of the sensing device circuit need to be connected with the main control circuit in a wireless mode, so that the structure is complex and the cost is high.

Disclosure of utility model

In view of the above, it is desirable to provide a torque sensor system and a moped that can improve the above problems.

A torque sensor system, comprising:

a five-way component;

The middle shaft penetrates through the five-way assembly and can rotate relative to the five-way assembly around a rotation axis through the first bearing; a first movable gap is arranged between the outer peripheral surface of the first bearing and the inner surface of the five-way component;

The transmission piece is arranged between the first bearing and the strain gauge in the radial direction of the center shaft; and when the middle shaft drives the first bearing to move along the radial direction relative to the five-way assembly, the transmission piece can transmit acting force to the strain gauge.

In one embodiment, the torque sensor system further comprises a second bearing disposed within the five-way assembly, the central shaft support being disposed within the second bearing;

The second bearing is fixedly connected with the five-way component, or a second movable gap is formed between the second bearing and the five-way component.

In one embodiment, the transmission member includes a thimble and an elastic portion, the elastic portion is disposed on the five-way assembly, and the thimble is abutted between the first bearing and the elastic portion along the radial direction;

The strain gauge is connected with the elastic part, and the thimble can transmit acting force to the strain gauge through the elastic part.

In one embodiment, the elastic part is independent of the five-way assembly and is arranged on the outer surface of the five-way assembly, and the strain gauge is arranged on the elastic part;

The five-way assembly is provided with a penetrating hole, the thimble penetrates through the penetrating hole, and two ends of the thimble are respectively abutted to the elastic part and the first bearing.

In one embodiment, the elastic part is connected with the five-way component through a screw.

In one embodiment, the torque sensor system further comprises a protective cover, wherein the protective cover is covered outside the elastic part and the strain gauge;

And the protective cover is provided with a lead hole, and a lead connected with the strain gauge can be led out through the lead hole.

In one embodiment, the resilient portion is formed directly on the five-way assembly.

In one embodiment, the first clearance gap has a dimension in the radial direction greater than 0mm and less than 0.5mm.

In one embodiment, the five-way assembly includes a five-way pipe, a first shaft sleeve and a second shaft sleeve, the first shaft sleeve and the second shaft sleeve are both disposed in the five-way pipe, and the first bearing is disposed in the first shaft sleeve and forms the first movable gap with the first shaft sleeve;

The moment sensor system further comprises a second bearing, the second bearing is sleeved in the five-way pipe through the second bearing, and the middle shaft is supported in the first bearing and the second bearing;

the center shaft is convexly provided with a first limiting part and a second limiting part, the first limiting part is propped against the inner side end surface of the first bearing, and the second limiting part is propped against the inner side end surface of the second bearing.

The power-assisted bicycle comprises a chain wheel, a crank, a flywheel, a chain and the moment sensor system, wherein the chain wheel and the crank are connected with a central shaft, the chain is arranged on the chain wheel and the flywheel, and a transmission piece is arranged between the first bearing and the strain gauge in a direction parallel to the chain.

The moment sensor system and the power-assisted bicycle are characterized in that the strain gauge is not directly attached to the center shaft any more, a first movable gap is formed between the outer surface of the first bearing and the inner surface of the five-way assembly, the transmission piece is arranged between the first bearing and the strain gauge, and the movement of the center shaft is transmitted to the strain gauge through the first bearing and the transmission piece, so that the moment sensor system can be connected with the main control circuit in a wired mode, the structure is simple, and the production cost is reduced.

Drawings

FIG. 1 is an isometric view of a torque sensor system provided in an embodiment of the present application;

FIG. 2 is a partial exploded view of the torque sensor system shown in FIG. 1;

FIG. 3 is a side view of the torque sensor system shown in FIG. 1;

FIG. 4 is a cross-sectional view of the A-A face of the torque sensor system shown in FIG. 3.

100. A torque sensor system; 10. a five-way component; 11. a five-way pipe; 12. a first sleeve; 13. a second sleeve; 14. penetrating holes; 20. a first bearing; 30. a center shaft; 31. a first limit part; 32. a second limit part; 40. a transmission member; 41. a thimble; 42. an elastic part; 50. a strain gage; 60. a second bearing; 70. a protective cover; 71. and (5) a lead hole.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

One embodiment of the present application provides a power assisted bicycle comprising a torque sensor system 100 (see fig. 1 and 2), a crankset, a crank, a flywheel, and a chain. Referring to fig. 3 and 4, the torque sensor system 100 includes a five-way assembly 10, a first bearing 20, and a central shaft 30. The first bearing 20 is disposed in the five-way assembly 10, and the middle shaft 30 is disposed in the five-way assembly 10 in a penetrating manner and is rotatable relative to the five-way assembly 10 about a rotation axis by the first bearing 20. The chain wheel and the crank are connected with the middle shaft 30, and the chain is arranged on the chain wheel and the flywheel.

By means of the arrangement, the pedaling moment of a rider tightens the chain between the chain wheel and the flywheel through the crank, so that the middle shaft 30 forms a stress component and displacement in the parallel direction with the chain, the pedaling frequency and the pedaling frequency are detected by the moment sensor of the power-assisted bicycle and used as input signals of the electric power-assisted system, and the electric power-assisted power strictly proportional to the pedaling power of the rider is output at the highest speed by the system, so that the purposes of easiness and labor saving are achieved.

Further, the torque sensor system 100 further includes a transmission 40 and a strain gage 50. A first clearance gap (not shown) is provided between the outer surface of the first bearing 20 and the inner surface of the five-way assembly 10, and the transmission member 40 is disposed between the first bearing 20 and the strain gauge 50 in the radial direction of the bottom bracket 30, specifically, the transmission member 40 is disposed between the first bearing 20 and the strain gauge 50 in the radial direction parallel to the chain. The pedaling moment of a rider tightens the chain between the toothed disc and the flywheel through the crank, so that the middle shaft 30 forms a stress component and displacement in the direction parallel to the chain, the middle shaft 30 can drive the first bearing 20 to move along the radial direction relative to the five-way assembly 10, the transmission piece 40 can transmit acting force to the strain gauge 50, the strain is strained, the pedaling frequency and the pedaling frequency are detected by using the acting force and the strain as input signals, and the system is enabled to output electric power in high speed in strict proportion to the pedaling power of the rider, so that the purposes of easiness and labor saving are achieved.

In the torque sensor system 100 provided by the embodiment of the application, the strain gauge 50 is not directly attached to the bottom bracket bearing 30, but a first movable gap is formed between the outer surface of the first bearing 20 and the inner surface of the five-way assembly 10, the transmission piece 40 is arranged between the first bearing 20 and the strain gauge 50, and the movement of the bottom bracket bearing 30 is transmitted to the strain gauge 50 through the first bearing 20 and the transmission piece 40, so that the torque sensor system 100 can be connected with a main control circuit in a wired mode, the structure is simple, and the production cost is reduced.

In some embodiments, with continued reference to FIG. 4, the torque sensor system 100 further includes a second bearing 60, the second bearing 60 being disposed within the five-way assembly 10, the central shaft 30 being supported within the first bearing 20 and the second bearing 60. Thus, the first bearing 20 and the second bearing 60 support the central shaft 30 together, and the rotation stability of the central shaft 30 is ensured.

Further, the five-way assembly 10 includes a five-way pipe 11, a first shaft sleeve 12 and a second shaft sleeve 13, the first shaft sleeve 12 and the second shaft sleeve 13 are both disposed in the five-way pipe 11, the first bearing 20 is disposed in the first shaft sleeve 12 and forms a first movable gap with the shaft sleeve, and the second bearing 60 is disposed in the second shaft sleeve 13. Of course, in some embodiments, the first sleeve 12 and the second sleeve 13 may be omitted.

In some embodiments, the dimension of the first movable gap in the radial direction is greater than 0mm and less than 0.5mm, so that a certain movable space is ensured between the first bearing 20 and the five-way assembly 10, but the movable space is not excessively large, which causes inconvenience to riding of a rider.

In some embodiments, a second clearance gap may also be provided between the second bearing 60 and the five-way assembly 10 to facilitate movement of the first bearing 20 relative to the five-way assembly 10. Of course, in other embodiments, to avoid inconvenience to riding, the second bearing 60 may be fixed relative to the five-way assembly 10, and the middle shaft 30 may be deformed to a certain extent when acted upon, so that the first bearing 20 moves relative to the five-way assembly 10.

The first sleeve 12 and the second sleeve 13 are both in threaded connection with the five-way pipe 11 to facilitate the removal of the sleeve relative to the five-way pipe 11. In order to avoid displacement of the middle shaft 30 in the axial direction when the middle shaft 30 is acted by force, a first limiting part 31 and a second limiting part 32 are convexly arranged on the middle shaft 30, the first limiting part 31 abuts against the inner side end surface of the first bearing 20, and the second limiting part 32 abuts against the inner side end surface of the second bearing 60. Thus, when the intermediate shaft 30 receives a force in the forward direction in the axial direction, the inner end surface of the first bearing 20 is engaged with the first stopper 31 to restrict the displacement of the intermediate shaft 30 under the forward force, and when the intermediate shaft 30 receives a force in the reverse direction in the axial direction, the inner end surface of the second bearing 60 is engaged with the second stopper 32 to restrict the displacement of the intermediate shaft 30 under the reverse force.

In some embodiments, with continued reference to fig. 4, the transmission member 40 includes a thimble 41 and an elastic portion 42, the elastic portion 42 is disposed on the five-way assembly 10, and the thimble 41 is radially abutted between the first bearing 20 and the elastic portion 42. The strain gauge 50 is connected to the elastic portion 42, and the ejector pin 41 can transmit the urging force to the strain gauge 50 through the elastic portion 42. Thus, when the first bearing 20 moves radially relative to the five-way assembly 10, a force is applied to the thimble 41, the thimble 41 elastically deforms the elastic portion 42, and the strain gauge 50 deforms at this time due to the connection of the strain gauge 50 and the elastic portion 42, so that the pedaling moment and the pedaling frequency of the bicycle can be detected by the deformation.

Further, the elastic portion 42 is provided independently of the five-way assembly 10, and is provided on an outer surface of the five-way assembly 10, and the strain gauge 50 is provided on the elastic portion 42. The five-way assembly 10 is provided with a through hole 14, and in particular, when the five-way assembly 10 includes the five-way pipe 11 and the first shaft sleeve 12, the through hole 14 is radially opened on the five-way pipe 11 and the first shaft sleeve 12. The ejector pin 41 is inserted into the insertion hole 14, and both ends thereof abut against the elastic portion 42 and the first bearing 20, respectively. When the middle shaft 30 is subjected to the force to displace in the radial direction, it will drive the first bearing 20 to displace in the radial direction, and the elastic portion 42 is deformed by the ejector pin 41, so as to deform the strain gauge 50.

To facilitate the fixation of the elastic portion 42 and the deformation of the elastic portion 42 when the elastic portion 42 receives the force of the ejector pin 41, the elastic portion 42 is connected to the five-way assembly 10 by a screw. The screw not only can firmly fix the elastic part 42 on the five-way pipe 11, but also can adjust the position of the elastic part 42 relative to the five-way pipe 11 so as to be matched with the first movable clearance, so that the elastic part 42 is elastically deformed.

Further, with continued reference to fig. 1 and 2, the torque sensor system 100 further includes a protective cover 70, where the protective cover 70 is disposed outside the elastic portion 42 and the strain gauge 50. The protective cover 70 is provided with a lead hole 71, and a wire connected to the strain gauge 50 can be led out through the lead hole 71.

In other embodiments, the elastic portion 42 is directly formed on the five-way assembly 10, that is, the elastic portion 42 is a part of the five-way assembly 10. In some embodiments, holes are formed on the inner sides of the first sleeve 12 and the five-way pipe 11, but the holes do not penetrate the five-way pipe 11, and the non-penetrated portion of the five-way pipe 11 serves as the elastic portion 42 to transmit deformation to the strain gauge 50.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. A torque sensor system, comprising:

a five-way assembly (10);

the five-way assembly comprises a first bearing (20) and a middle shaft (30), wherein the middle shaft (30) penetrates through the five-way assembly (10) and can rotate relative to the five-way assembly (10) around a rotation axis through the first bearing (20); a first movable gap is arranged between the outer peripheral surface of the first bearing (20) and the inner surface of the five-way assembly (10);

A transmission member (40) and a strain gauge (50), wherein the transmission member (40) is arranged between the first bearing (20) and the strain gauge (50) in the radial direction of the center shaft (30); when the middle shaft (30) drives the first bearing (20) to move along the radial direction relative to the five-way assembly (10), the transmission piece (40) can transmit acting force to the strain gauge (50).

2. The torque sensor system according to claim 1, further comprising a second bearing (60), said second bearing (60) being disposed within said five-way assembly (10), said central shaft (30) being supported within said second bearing (60);

The second bearing (60) is fixedly connected with the five-way component (10), or a second movable gap is formed between the second bearing (60) and the five-way component (10).

3. Torque sensor system according to claim 1 or 2, characterized in that the transmission element (40) comprises a thimble (41) and an elastic portion (42), the elastic portion (42) being provided on the five-way assembly (10), the thimble (41) being arranged in abutment between the first bearing (20) and the elastic portion (42) along the radial direction;

The strain gauge (50) is connected with the elastic part (42), and the thimble (41) can transmit acting force to the strain gauge (50) through the elastic part (42).

4. A torque sensor system according to claim 3, characterized in that the elastic portion (42) is provided independently of the five-way assembly (10) and on the outer surface of the five-way assembly (10), the strain gauge (50) being provided on the elastic portion (42);

The five-way assembly (10) is provided with a penetrating hole (14), the thimble (41) penetrates through the penetrating hole (14), and two ends of the thimble are respectively abutted with the elastic part (42) and the first bearing (20).

5. The torque sensor system according to claim 4, characterized in that the elastic portion (42) is connected to the five-way assembly (10) by means of a screw.

6. The torque sensor system according to claim 4, further comprising a protective cover (70), the protective cover (70) being covered outside the elastic portion (42) and the strain gauge (50);

and a lead hole (71) is formed in the protective cover (70), and a wire connected with the strain gauge (50) can be led out through the lead hole (71).

7. A torque sensor system according to claim 3, characterized in that the resilient portion (42) is formed directly on the five-way assembly (10).

8. A torque sensor system according to claim 1 or 2, wherein the first clearance gap has a dimension in the radial direction of greater than 0mm and less than 0.5mm.

9. The torque sensor system according to claim 1, wherein the five-way assembly (10) comprises a five-way pipe (11), a first shaft sleeve (12) and a second shaft sleeve (13), the first shaft sleeve (12) and the second shaft sleeve (13) are both arranged in the five-way pipe (11), and the first bearing (20) is arranged in the first shaft sleeve (12) and forms the first movable gap with the first shaft sleeve (12);

The torque sensor system further comprises a second bearing (60), the second bearing (60) is arranged in the five-way pipe (11) through the second bearing sleeve (13), and the center shaft (30) is arranged in the first bearing (20) and the second bearing (60) in a supporting way;

the center shaft (30) is convexly provided with a first limiting part (31) and a second limiting part (32), the first limiting part (31) is propped against the inner side end surface of the first bearing (20), and the second limiting part (32) is propped against the inner side end surface of the second bearing (60).

10. A moped comprising a toothed disc, a crank, a flywheel, a chain and a torque sensor system according to any of claims 1-9, wherein the toothed disc and the crank are both connected to the central shaft (30), the chain is arranged on the toothed disc and the flywheel, and the transmission member (40) is arranged between the first bearing (20) and the strain gauge (50) in a direction parallel to the chain.