阅读说明：本技术 一种用于电动助力车的扭力传感器 (Torsion sensor for electric bicycle ) 是由 张斌 柯韦圣 黄泽鹏 于 2021-07-22 设计创作，主要内容包括：本发明涉及电动助力车技术领域,具体涉及一种用于电动助力车的扭力传感器,包括：扭力套筒,可随中轴转动,一端与中轴固定连接,另一端与输出部连接；导磁元件,设置在扭力套筒的外表面,导磁元件可随扭力套筒转动并发生形变；支架组件,套设在扭力套筒上,支架组件上设置有线圈组件和电路板,线圈组件和电路板电连接,线圈组件位于支架组件上遮盖导磁元件的部分；本发明通过到导磁元件随扭力套筒转动而发生形变,从而改变磁通量,检测组件检测磁通量的变化大小从而测得扭力的变化,提高检测精度；并且本发明中只需要中轴受力使得导磁元件发生形变即可测得扭力变化,因而能够检测静态和动态扭力,工作性能更加稳定可靠。(The invention relates to the technical field of electric moped, in particular to a torsion sensor for the electric moped, which comprises: the torsion sleeve can rotate along with the middle shaft, one end of the torsion sleeve is fixedly connected with the middle shaft, and the other end of the torsion sleeve is connected with the output part; the magnetic conduction element is arranged on the outer surface of the torsion sleeve and can rotate along with the torsion sleeve and deform; the bracket component is sleeved on the torsion sleeve, a coil component and a circuit board are arranged on the bracket component, the coil component is electrically connected with the circuit board, and the coil component is positioned on the part, covering the magnetic conductive element, of the bracket component; according to the invention, the magnetic conduction element deforms along with the rotation of the torque sleeve, so that the magnetic flux is changed, the detection assembly detects the change of the magnetic flux, so that the change of the torque is detected, and the detection precision is improved; in addition, the torsion change can be measured only by the deformation of the magnetic conduction element caused by the stress of the middle shaft, so that the static and dynamic torsion can be detected, and the working performance is more stable and reliable.)

1. A torque sensor for an electric bicycle mounted on a bottom bracket (100), comprising:

the torsion sleeve (200) can rotate along with the middle shaft (100), one end of the torsion sleeve is fixedly connected with the middle shaft (100), and the other end of the torsion sleeve is connected with the output part (300);

the magnetic conduction element (201) is arranged on the outer surface of the torsion sleeve (200), and the magnetic conduction element (201) can rotate along with the torsion sleeve (200) and deform;

the support assembly (202) is sleeved on the torsion sleeve (200), a coil assembly (203) and a circuit board (204) are arranged on the support assembly (202), the coil assembly (203) is electrically connected with the circuit board (204), the coil assembly (203) is positioned on the support assembly (202) and covers the part of the magnetic conducting element (201), and a magnetism isolating sleeve (207) is further sleeved on the support assembly (202);

a magnetic isolation gasket (208) disposed on the bracket assembly (202) in a region between the coil assembly (203) and the circuit board (204);

the speed magnetic ring is characterized by further comprising a speed magnetic ring (209) and an induction element for inducing the speed magnetic ring (209), wherein the speed magnetic ring (209) is fixedly arranged on the middle shaft (100), and the induction element is arranged on the circuit board (204).

2. The torque sensor for an electric bicycle according to claim 1, wherein the magnetic conductive element (201) is in the shape of a sleeve sheet and is attached to the outer surface of the torque sleeve (200).

3. The torque sensor for the electric bicycle according to claim 1 or 2, wherein an isolation layer is further disposed between the torque sleeve (200) and the magnetic conductive element (201).

4. The torque sensor for an electric bicycle according to claim 1, wherein the outer surface of the magnetic conductive element (201) is formed with a plurality of perforations (206).

5. The torque sensor for an electric bicycle according to claim 4, wherein the perforations (206) are arranged in two groups, and the two groups of perforations (206) are symmetrically distributed.

6. The torque sensor for an electric bicycle according to claim 5, wherein the perforations (206) are obliquely arranged on the outer surface of the magnetic conductive element (201), and the angle between the two sets of perforations (206) in the length direction is 75 ° to 105 °.

7. The torque sensor for the electric bicycle according to claim 1, further comprising a support cover (400), wherein the support cover (400) is sleeved on the central shaft (100) and can rotate relative to the central shaft (100), and one end of the bracket assembly (202) is fixedly connected with the support cover (400).

Technical Field

The invention relates to the technical field of electric moped, in particular to a torsion sensor for an electric moped.

Background

The sensor (english name: transducer/sensor) is a detection device, which can sense the measured information and convert the sensed information into electric signals or other information in required form according to a certain rule to output, so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like.

An electric moped, also called a moped, is a novel two-wheel vehicle, belongs to a bicycle, takes a battery as an auxiliary power source, is provided with a motor, is provided with a power auxiliary system, and can realize a novel vehicle integrating manpower riding and motor power assisting. The torsion sensor is a core component for understanding the intention of a rider of the electric power-assisted system of the power-assisted bicycle, and the existence of the torsion sensor can adjust the output power of the motor of the electric bicycle according to the measured torsion in the riding process, so that the riding comfort is improved.

At present, a center shaft is increasingly adopted for installing a torsion sensor, a common structure is that a strain gauge is pasted on a sleeve connected with the center shaft or the center shaft, the magnitude of trampling torsion is sensed through the strain gauge, and a voltage signal is output after signal processing to further control the output power of a motor.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides a torque sensor for an electric bicycle, which is mounted on a center shaft, and comprises: the torsion sleeve can rotate along with the middle shaft, one end of the torsion sleeve is fixedly connected with the middle shaft, and the other end of the torsion sleeve is connected with the output part; the magnetic conduction element is arranged on the outer surface of the torsion sleeve and can rotate along with the torsion sleeve and deform; the coil assembly is electrically connected with the circuit board, the coil assembly is positioned on the part, covering the magnetic conductive element, of the support assembly, and the support assembly is further sleeved with a magnetic isolation sleeve; the magnetic isolation gasket is arranged on the bracket component and positioned in the area between the coil component and the circuit board; the speed magnetic ring is fixedly arranged on the middle shaft, and the induction element is arranged on the circuit board.

Further, the magnetic conductive element is in a sleeve sheet shape and is attached to the outer surface of the torsion sleeve.

Furthermore, an isolation layer is arranged between the torsion sleeve and the magnetic conduction element.

Furthermore, a plurality of through holes are formed on the outer surface of the magnetic conduction element.

Furthermore, there are two groups of the through holes, and the two groups of the through holes are symmetrically distributed.

Further, the through holes are obliquely arranged on the outer surface of the magnetic conduction element, and the included angle between the two groups of through holes in the length direction is 75-105 degrees.

The support cover is sleeved on the middle shaft and can rotate relative to the middle shaft, and one end of the support assembly is fixedly connected with the support cover.

The invention mainly has the following beneficial effects: according to the torsion sensor, the magnetic conduction element deforms along with the rotation of the torsion sleeve, so that the magnetic flux is changed, the detection assembly detects the change of the magnetic flux, the change of the torsion is detected, and the detection precision is improved; in addition, the torsion change can be measured only by the deformation of the magnetic conduction element caused by the stress of the middle shaft, so that the static and dynamic torsion can be detected, and the working performance is more stable and reliable.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is an assembly view of a magnetic flux type torsion sensor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a magnetic flux type torsion sensor according to an embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a magnetic flux type torsion sensor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a magnetic conductive element according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 3, the torque sensor for an electric bicycle is mounted on a center shaft 100, and includes a torque sleeve 200 having one end fixed to the center shaft 100, the torque sleeve 200 is provided with a magnetic conductive element 201, the magnetic conductive element 201 may be sleeved, attached or embedded on an outer surface of the torque sleeve 200, and the magnetic conductive element 201 may rotate and deform along with the torque sleeve 200, specifically, the center shaft 100 is connected to a pedal through a direct or indirect manner, one end of the torque sleeve 200 is connected to the center shaft 100 through a spline and rotates along with the center shaft 100, the other end of the torque sleeve 200 is connected to an output portion 300, it should be noted that, in this embodiment, the output portion 300 may be a shaft component or a tooth component, and the torque sleeve 200 and the output portion 300 may be connected through a one-way device 301, the one-way device 301 may be a pawl or a one-way clutch, the one-way clutch can adopt a structure commonly used in the industry, and the technical scheme is not described again; the torque sleeve 200 is sleeved with a support assembly 202, the support assembly 202 is provided with a coil assembly 203 and a circuit board 204, the coil assembly 203 is electrically connected with the circuit board 204, the coil assembly 203 is arranged on a part of the support assembly 202 covering the magnetic conductive element 201, namely, the coil assembly 203 can induce the magnetic flux change caused by the deformation of the magnetic conductive element 201 and form an electric signal to be transmitted to the circuit board 204, and the circuit board 204 receives the electric signal and then processes and converts the electric signal to measure the change of the torque force, so that the detection accuracy of the torque sensor is improved; the bracket assembly 202 is further provided with a magnetic isolation sleeve 207, which aims to avoid magnetic field dispersion from affecting the circuit board 204, and further, a magnetic isolation gasket 208 is further arranged in a region between the coil assembly 203 and the circuit board 204 on the bracket assembly 202, the coil assembly 203 and/or the magnetic conductive element 201 of the embodiment are/is located in a region formed by enclosing the magnetic isolation sleeve 207 and the magnetic isolation gasket 208, so that an internal magnetic field and an external magnetic field of the coil assembly 203 are isolated, and the detection stability and reliability of the torsion sensor are ensured; the torque sensor further comprises a speed magnetic ring 209 and an induction element for inducing the speed magnetic ring 209, the speed magnetic ring 209 is fixedly installed on the middle shaft 100 and rotates along with the middle shaft 100, the induction element is arranged on one surface, close to the speed magnetic ring 209, of the circuit board 204, the induction element can be a Hall IC, and the rotation rate or the stepping frequency of the middle shaft 100 can be accurately measured through the matching of the induction element and the speed magnetic ring 209.

In some embodiments, referring to fig. 4, the magnetic conductive element 201 is in a shape of a sleeve sheet and is attached to the outer surface of the torque sleeve 200, when the central shaft 100 drives the output portion 300 to rotate, the torque sleeve 200 transmits a torque force through the torque sleeve 200, so that the torque sleeve 200 slightly deforms, and the magnetic conductive element 201 also rotates and deforms along with the torque sleeve 200, so that a change of a magnetic flux is sensed through the coil assembly 203, and then the change is processed through the circuit board 204 to obtain a change of the torque force.

In some embodiments, referring to fig. 3, an isolation layer is further disposed between the torque sleeve 200 and the magnetic conducting element 201, and specifically, the isolation layer may be a copper plating layer or the like on an outer surface of the torque sleeve 200, which is used to isolate residual magnetism generated after the torque sleeve 200 is subjected to an alternating torque, so as to ensure that a magnetic flux change generated by the magnetic conducting element 201 is not affected by the torque sleeve 200 or an external environment.

In some embodiments, referring to fig. 4, the outer surface of the magnetic conductive element 201 is formed with a plurality of through holes 206, the through holes 206 may be circular, rectangular, oval or kidney-shaped, further, two sets of through holes 206 are symmetrically distributed on the outer surface of the magnetic conductive element 201, the two sets of through holes 206 are obliquely arranged and form a certain included angle, and the included angle between the two sets of through holes 206 in the length direction is 75 ° to 105 °, which aims to enhance the deformation of the magnetic conductive element 201 along with the torsion sleeve 200 to generate a larger magnetic flux change, and further improve the accuracy of the torsion sensor.

In some embodiments, referring to fig. 1 and 3, the torque sensor further includes a supporting cover 400, the supporting cover 400 is sleeved on the central shaft 100 and can rotate relative to the central shaft 100, one end of the bracket assembly 202 is fixedly connected to the supporting cover 400, specifically, the supporting cover 400 can be connected to the central shaft 100 through a bearing 211, and one end of the bracket assembly 202 can be fixed to the supporting cover 400 through a threaded connection, so that the purpose is that the bracket assembly 202, the coil assembly 203 and the circuit board 204 can be designed and assembled as a whole, and then the whole assembly is sleeved on the torque sleeve 200 through the supporting cover 400, thereby facilitating the whole disassembly and assembly and maintenance.

It should be noted that the magnetic conductive element 201 described in all the above embodiments can be made of a material with high magnetic permeability, such as iron or iron alloy.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.