CN212275119U

CN212275119U - Magnetic flux type torsion sensor

Info

Publication number: CN212275119U
Application number: CN202021426104.6U
Authority: CN
Inventors: 张斌; 柯韦圣
Original assignee: Zhuhai Junxing Electromechanical Co ltd
Current assignee: Zhuhai Junxing Electromechanical Co ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2021-01-01
Anticipated expiration: 2030-07-17

Abstract

The utility model relates to the technical field of sensors, in particular to a magnetic flux type torsion sensor, which adopts the structure that a torsion sleeve, an isolation sleeve, a coil component and a circuit board are sequentially arranged on a central shaft, a shielding structure is arranged on the torsion sleeve, a through hole matched with the shielding structure is arranged on the isolation sleeve, the torsion sleeve rotates along with the central shaft to drive an output part to rotate, the torsion sleeve generates elastic deformation to change the shielding area between the torsion sleeve and the isolation sleeve, thereby changing the magnetic flux rate, the coil component detects the change of the magnetic flux rate under the shielding area to measure the change of the torsion, the detection precision of the magnetic flux type torsion sensor is improved, and the torsion sleeve, the isolation sleeve and the coil component can be sequentially sleeved on the central shaft, the structure is simple and easy to install, the connection mode with the central shaft is firm, and the problem of falling off can not occur, the stability and the reliability of the magnetic flux type torsion sensor are improved.

Description

Magnetic flux type torsion sensor

Technical Field

The utility model relates to a sensor technical field, especially a magnetic flux formula torque sensor.

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.

The booster bicycle is a new type two-wheel vehicle, belonging to a kind of bicycle, and using battery as auxiliary power source, and equipped with motor, and possesses power auxiliary system, and can implement manpower riding and motor-assisted integrated new type transportation means. 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.

SUMMERY OF THE UTILITY MODEL

For solving the above-mentioned problem that exists among the prior art, the utility model provides a magnetic flux formula torque sensor.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a magnetic flux type torsion sensor mounted on a bottom bracket, comprising: one end of the torsion sleeve is fixedly connected with the middle shaft and rotates along with the middle shaft, and the other end of the torsion sleeve is connected with the output part; the isolation sleeve is sleeved on the torsion sleeve, and one end of the isolation sleeve is fixedly connected with the torsion sleeve; the coil assembly is sleeved on the isolation sleeve; a circuit board electrically connected to the coil assembly; the outer surface of the torsion sleeve is provided with a shielding structure, the isolation sleeve is provided with a through hole matched with the shielding structure, the middle shaft drives the torsion sleeve to rotate, and the torsion sleeve generates elastic deformation to change the shielding area between the through hole and the shielding structure.

Further, the shielding structure is provided with a plurality of shielding structures and is arranged on the outer surface of the torsion sleeve along the circumferential direction.

Furthermore, the through holes are provided with a plurality of through holes and are arranged on the side wall of the isolation sleeve corresponding to the shielding structures.

Further, the shielding structure is a groove or a protrusion arranged on the outer surface of the torsion sleeve.

Further, the groove or the protrusion is waist-shaped.

Further, the shielding structures and the through holes are arranged in a staggered mode.

Further, the through holes are distributed on the side wall of the isolation sleeve in a mesh manner.

Further, a magnetic isolation sleeve is arranged between the coil assembly and the circuit board.

Further, the coil assembly comprises a coil support and at least one group of induction coils, and the induction coils are wound on the coil support at positions corresponding to the through holes.

Further, a circuit board support is sleeved on the coil assembly, the circuit board is mounted on the circuit board support, and the circuit board support is connected with the torsion sleeve through a rolling bearing.

Furthermore, a Hall sensor is arranged on the circuit board support and used for sensing the rotating speed of the middle shaft.

The utility model discloses mainly have following beneficial effect:

the magnetic flux type torsion sensor of the utility model adopts the structure that the torsion sleeve, the isolation sleeve, the coil component and the circuit board are arranged on the middle shaft in sequence, the torsion sleeve is provided with a shielding structure, the isolation sleeve is provided with a through hole matched with the shielding structure, when one end of the torsion sleeve is meshed with the output part, the middle shaft drives the output part to rotate through the torsion sleeve, and the torsion sleeve is elastically deformed to change the shielding area between the torsion sleeve and the isolation sleeve, thereby changing the magnetic flux rate, the coil assembly detects the change of the magnetic flux rate under the shielding area so as to measure the change of the torsion, the detection precision of the magnetic flux type torsion sensor is improved, and the torsion sleeve, the isolation sleeve and the coil assembly can be sleeved on the middle shaft in sequence, the structure is simple and the installation is easy, the magnetic flux type torsion sensor is firm in connection with the middle shaft, the problem of falling cannot occur, and stability and reliability of the magnetic flux type torsion sensor are improved.

Drawings

Fig. 1 is an assembly schematic 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.

Detailed Description

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

Referring to fig. 1 to 3, a magnetic flux type torsion sensor is shown, which is installed on a middle shaft 100, and includes a torsion sleeve 200 with one end fixed on the middle shaft 100, an isolation sleeve 300 is sleeved on the torsion sleeve 200, and a coil assembly 400 is further sleeved on the isolation sleeve 300, the coil assembly 400 is connected with a circuit board 500, specifically, the middle shaft 100 is connected with a pedal in a direct or indirect manner, one end of the torsion sleeve 200 is connected with the middle shaft 100 through a spline and rotates with the middle shaft 100, and the other end is connected with an output portion 101, it should be noted that, in this embodiment, the output portion 101 may be a shaft part or a tooth part, and the torsion sleeve 200 and the output portion 101 may be connected through a one-way device, which may be a pawl or a one-way clutch, which may adopt a structure commonly used in the industry, no further description is given in the technical scheme; one end of the isolation sleeve 300 is fixed with the torsion sleeve 200, the other end is suspended, the outer surface of the torsion sleeve 200 is further provided with a shielding structure 201, the isolation sleeve 300 is further provided with a through hole 301 matched with the shielding structure 201, when a person steps on a pedal, the middle shaft 100 is driven to rotate, the torsion sleeve 200 is deformed due to the fact that the torque is transmitted between the middle shaft 100 and the output part 101 through the torsion sleeve 200, the shielding area between the torsion sleeve 200 and the isolation sleeve 300 is changed, namely the magnetic flux rate is changed, the coil assembly 400 detects the change of the magnetic flux rate under the shielding area and forms an electric signal to be transmitted to the circuit board 500, the circuit board 500 receives the electric signal and then processes and converts the electric signal to measure the change of the torsion, and the detection accuracy of the magnetic flux type torsion sensor; and torsion sleeve 200, isolation sleeve 300, coil pack 400 all can overlap in proper order on axis 100, and simple structure easily installs, and the connected mode with axis 100 is firm, can not appear the problem that drops, improves this magnetic-flux type torsion sensor's stability and reliability.

In some embodiments, the shielding structure 201 is disposed on the outer surface of the torque sleeve 200 along the circumferential direction, specifically, the torque sleeve 200 is cylindrical, the shielding structure 201 is disposed on the outer surface of the cylindrical torque sleeve 200, when the central shaft 100 drives the output portion 101 to rotate, torque is transmitted through the torque sleeve 200, so that the torque sleeve 200 generates a slight deformation, which is usually an elastic deformation, the slight deformation generated on the torque sleeve 200 can cause a change in magnetic flux rate between the torque sleeve 200 and the isolation sleeve 300, the change in magnetic flux rate is detected by the coil assembly 400, and the change is processed by the circuit board 500 to obtain a change in torque.

In some embodiments, the number of the through holes 301 is several, and the through holes are disposed on the side wall of the re-isolation sleeve 300 corresponding to the number of the shielding structures 201, so that the detection precision can be improved by disposing the number of the shielding structures 201 to be matched with the number of the through holes 301, that is, the change of the shielding area between the torque sleeve 200 and the isolation sleeve 300 can be refined, and the change of the magnetic flux rate can be accurately detected; in other embodiments, the through holes 301 are arranged in a mesh shape, which aims to further improve the detection accuracy.

In some embodiments, the shielding structures 201 are staggered with respect to the through holes 301, so that the aperture of the through holes 301 can be larger than or smaller than or equal to the maximum dimension of the shielding structures 201, therefore, when the torsion sleeve 200 is elastically deformed, the shielding area between the shielding structure 201 and the boundary of the through hole 301 changes, and it is avoided that the through hole 301 is always in the shielding structure 201 or the shielding structure 201 is always in the through hole 301 without changing the shielding area, that is, the boundary of the through hole 301 needs to be projected in the shielding structure 201 and/or the boundary of the shielding structure 201 needs to be projected in the through hole 301, therefore, when the torsion sleeve 200 is elastically deformed, the area of the overlapping portion of the isolation sleeve 300 and the shielding structure 201 is changed, that is, the shielding area is changed, so as to cause the change of the magnetic flux rate.

In some embodiments, referring to fig. 1, the shielding structure 201 is a groove or a protrusion disposed on the outer surface of the torque sleeve 200, in this embodiment, the groove is taken as an example, and the groove is in a kidney shape, which is used to ensure that the distance between the shielding structure 201 and the isolation sleeve 300 and the distance between the outer surface of the torque sleeve 200 and the isolation sleeve 300 are different, so that the magnetic flux rate can be changed when the torque sleeve 200 is deformed, and the depth of the groove or the height of the protrusion can be set according to actual conditions.

In some embodiments, referring to fig. 1 and 3, a magnetic isolation sleeve 600 is disposed between the coil assembly 400 and the circuit board 500 to prevent the magnetic field from being emitted to affect the circuit board 500.

In some embodiments, the coil assembly 400 includes a coil support and at least one set of induction coils wound on the coil support, and the induction coils are specifically wound on the coil support at positions corresponding to the through holes 301, so as to further improve the detection accuracy, ensure that the induction coils can accurately detect the change of the magnetic flux rate, and then convert the change into an electrical signal to be sent to the circuit board 500.

In some embodiments, the coil assembly 400 is sleeved with a circuit board support 700, the circuit board 500 is mounted on the circuit board support 700, and the circuit board holder 700 is connected to the torque sleeve 200 through the rolling bearing 800, that is, when the central shaft 100 rotates, the torque sleeve 200, the isolation sleeve 300 and the coil assembly 400 rotate along with the central shaft 100, the torque sleeve 200 and the isolation sleeve 300 rotate relatively due to the elastic deformation of the torque sleeve 200, so as to cause the change of the shielding area, the coil assembly 400 detects the change of the magnetic flux rate caused by the change of the shielding area, the magnetic isolation sleeve 600 may or may not rotate with the torque sleeve 200, the circuit board support 700 is connected to the torsion sleeve 200 through the rolling bearing 800, so that the circuit board support 700 does not rotate along with the torsion sleeve 200, thereby ensuring the stability and reliability of the magnetic flux type torsion sensor.

In some embodiments, referring to fig. 1 and fig. 2, the circuit board support 700 is provided with a hall sensor 900, the hall sensor 900 is configured to sense a rotation speed of the central shaft 100, specifically, since the torque sleeve 200 rotates synchronously with the central shaft 100, the rotation speed of the central shaft 100 can be measured by detecting the rotation speed of the torque sleeve 200 through the hall sensor 900, in this embodiment, the hall sensor 900 may be of a commercially conventional type and specification, and a specific structure of the hall sensor 900 is not described herein again.

It should be noted that the torsion sleeve 200 of all the above embodiments can be made of a material with high magnetic permeability, such as iron or iron alloy.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. A magnetic flux type torque sensor is arranged on a middle shaft and is characterized by comprising:

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 isolation sleeve is sleeved on the torsion sleeve, and one end of the isolation sleeve is fixedly connected with the torsion sleeve;

the coil assembly is sleeved on the isolation sleeve;

a circuit board electrically connected to the coil assembly;

the outer surface of the torsion sleeve is provided with a shielding structure, the isolation sleeve is provided with a through hole matched with the shielding structure, and the torsion sleeve rotates along with the middle shaft and generates elastic deformation to change the shielding area between the torsion sleeve and the isolation sleeve.

2. The magnetic flux type torsion sensor according to claim 1, wherein the shielding structure is provided in a plurality and circumferentially on an outer surface of the torsion sleeve.

3. A magnetic flux type torsion sensor according to claim 2, wherein a plurality of said through holes are formed in the side wall of said spacer sleeve and correspond to a plurality of said shielding structures.

4. The magnetic flux type torsion sensor according to claim 1, wherein the shielding structure is disposed to intersect with the through hole.

5. The magnetic flux type torsion sensor according to claim 1, wherein the shielding structure is a groove or a protrusion disposed on an outer surface of the torsion sleeve.

6. A magnetic flux torsion sensor according to any one of claims 1 to 5, wherein the through holes are distributed in a mesh pattern on the side wall of the spacer sleeve.

7. The magnetic flux type torsion sensor according to claim 1, wherein a magnetic isolation sleeve is provided between the coil block and the circuit board.

8. The magnetic flux type torsion sensor according to claim 1, wherein the coil assembly comprises a coil support and at least one set of induction coils wound on the coil support at positions corresponding to the through holes.

9. The magnetic flux type torque sensor according to claim 1, wherein the coil assembly is sleeved with a circuit board support, the circuit board is mounted on the circuit board support, and the circuit board support is connected to the torque sleeve through a rolling bearing.

10. The magnetic flux type torsion sensor according to claim 9, wherein the circuit board support is provided with a hall sensor, and the hall sensor is used for sensing a rotation speed of the middle shaft.