WO2014190568A1

WO2014190568A1 - Device for measuring moment of central shaft

Info

Publication number: WO2014190568A1
Application number: PCT/CN2013/077470
Authority: WO
Inventors: 张斌
Original assignee: 深圳市森浦精机科技有限公司
Priority date: 2013-05-27
Filing date: 2013-06-19
Publication date: 2014-12-04
Also published as: CN203274988U; DE212013000300U1

Abstract

Disclosed is a device for measuring the moment of a central shaft, which device comprises a central shaft (1), a bearing (2) used for bracketing the central shaft (1) to rotate, a tooth bowl (3) used for installing the bearing (2), a shaft sleeve (4) and a controller (5), and further comprises a strain gauge (6), an non-contact voltage module (7), an non-contact moment signal transmission module (8), a first PCB bracket (9) and a second PCB bracket (10), wherein the strain gauge (6) is attached to the central shaft (1). The device for measuring the moment of a central shaft is accurate in measurement result; good in fatigue resistance of the strain gauge, resistant to fatigue and deformation, and long in life cycle; quick in signal output speed; and simple in installation and low in manufacturing costs; and can measure the distorting deformation and can measure the bending deformation of the central shaft as well.

Description

Central axis torque measuring device

Technical field

The utility model relates to the technical field of a torque sensing device, in particular to a central axis torque measuring device applied to a bicycle and an electric bicycle.

Background technique

The installation position of the existing bicycle and electric bicycle torque sensing device is generally located on the crankset, and the induction method generally relies on the elastic deformation test torque of the spring. The installation method is too complicated, the signal output response is slow, and the spring is in use. After a period of time, the measurement results become more and more inaccurate due to fatigue deformation.

Utility model content

The purpose of the present invention is to provide a center axis torque measuring device in order to overcome the deficiencies of the prior art.

In order to achieve the above object, the utility model adopts the following technical solutions: a central axis torque measuring device, comprising a central shaft, a bearing for supporting the rotation of the central shaft, a tooth bowl for mounting the bearing, a bushing and a controller, and a strain gauge and a non-strain a contact voltage module, a non-contact torque signal transmission module, a first PCB bracket and a second PCB bracket, wherein the strain gauge is attached to the central shaft;

The non-contact voltage module is used for supplying a working voltage to the strain gauge, and the non-contact voltage module comprises a DC power source, an oscillating circuit and a first inductor coil, a second inductor coil, a rectification voltage regulator circuit, a DC power source, an oscillating circuit and a first inductor coil. Connected, the second inductor coil is connected to the rectifier voltage regulator circuit;

The non-contact torque signal transmission module is configured to output a torque signal collected by the strain gauge to the controller, where the non-contact torque signal transmission module includes a signal amplification circuit, a voltage-frequency conversion circuit, a fourth inductance coil, a third inductance coil, and a frequency. a voltage conversion circuit; a fourth inductor coil, a voltage-frequency conversion circuit, a signal amplifying circuit and a strain gauge are sequentially connected, and the frequency-voltage conversion circuit is respectively connected to the third inductor coil and the controller;

The rectifying and stabilizing circuit is respectively connected with the voltage-frequency conversion circuit, the signal amplifying circuit and the strain gauge;

The first PCB is disposed on the sleeve, the first inductor, the oscillating circuit, the third inductor, and the frequency-voltage conversion circuit are disposed on the first PCB bracket, and the first inductor and the third inductor are respectively configured At both ends of the first PCB holder;

The second PCB bracket is disposed on the central axis, and the second inductor coil, the rectifier voltage regulator circuit, the signal amplifying circuit, the voltage-frequency conversion circuit, and the fourth inductor coil are disposed on the second PCB bracket, and the second inductor coil And the fourth inductor coils are respectively disposed at both ends of the second PCB bracket;

The first inductive coil and the second inductive coil are disposed corresponding to each other, and the third inductive coil and the fourth inductive coil are disposed corresponding to each other.

The first PCB bracket and the second PCB bracket are cylindrical, and the first PCB bracket, the second PCB bracket, the sleeve and the central shaft are disposed on the same axis.

The first inductive coil and the second inductive coil are in a same plane perpendicular to the central axis of the central axis.

The third inductive coil and the fourth inductive coil are in the same plane perpendicular to the central axis of the central axis.

The sleeve and the bowl are splined.

One end of the second PCB holder is further provided with a magnet, and a magnetic sensor is disposed at a position of one end of the first PCB holder corresponding to the magnet, and the magnetic sensor is connected to the controller.

The test direction of the strain gauge is arranged parallel to the axis of the central axis.

The test direction of the strain gauge is perpendicular to the axis of the central axis.

The test direction of the strain gauge is set at an angle to the axis of the central axis

The utility model has the beneficial effects compared with the prior art: 1) the induction device is mounted on the central axis, and the measurement result is accurate; 2) the induction piece has good fatigue resistance, is not easy to fatigue deformation, and has a long life cycle; 3) signal output speed Fast; 4) Simple installation and low manufacturing cost; 5) It can measure the distortion of the central axis and the bending deformation of the central axis.

DRAWINGS

Figure 1 is a schematic cross-sectional view of the utility model;

2 is a schematic diagram of the circuit principle of the present invention.

detailed description

In order to more fully understand the technical content of the present invention, the technical solutions of the present invention will be further introduced and described below in conjunction with specific embodiments.

1 is a schematic structural view of the utility model; FIG. 2 is a schematic diagram of the circuit principle of the utility model, a central axis torque measuring device, including a central shaft 1, a bearing supporting the central shaft rotation, and a mounting bearing The tooth bowl 3, the sleeve 4 and the controller 5 further include a strain gauge 6, a non-contact voltage module 7, a non-contact torque signal transmission module 8, a first PCB holder 9 and a second PCB holder 10, the strain gauge 6 Attached to the center axis 1;

The non-contact voltage module 7 is used to supply the working voltage to the strain gauge 6. The non-contact voltage module 7 includes a DC power source 71, an oscillating circuit 72 and a first inductor 73, a second inductor 74, a rectifying voltage regulator 75, and a DC power source 71. The oscillating circuit 72 and the first inductive coil 73 are sequentially connected, and the second inductive coil 74 is connected to the rectifying and stabilizing circuit 75;

The non-contact torque signal transmission module 8 is configured to output the torque signal collected by the strain gauge 6 to the controller 5, and the non-contact torque signal transmission module 8 includes a signal amplification circuit 81, a voltage-frequency conversion circuit 82, and a fourth inductance coil 83. a third inductive coil 84 and a frequency-to-voltage conversion circuit 85; a fourth inductive coil 83, a voltage-to-frequency conversion circuit 82, a signal amplifying circuit 81, and a strain gauge 6 are sequentially connected, and the frequency-voltage conversion circuit 85 and the third inductance coil are respectively connected 84, the controller 5 is connected;

The rectifier voltage stabilizing circuit 75 is connected to the voltage-frequency conversion circuit 82, the signal amplifying circuit 81, and the strain gauge 6, respectively;

The first PCB holder 9 is disposed on the sleeve 2, and the first inductor 73, the oscillating circuit 72, the third inductor 84, and the frequency-voltage conversion circuit 85 are disposed on the first PCB holder 9, the first inductor 73 and the third inductive coil 84 are respectively disposed at both ends of the first PCB bracket 9;

The second PCB holder 10 is disposed on the central axis 1. The second inductive coil 74, the rectifying and regulating circuit 75, the signal amplifying circuit 81, the voltage-frequency converting circuit 82, and the fourth inductive coil 83 are disposed on the second PCB bracket 10. The second inductive coil 74 and the fourth inductive coil 83 are respectively disposed at two ends of the second PCB bracket 10;

The first inductive coil 73 and the second inductive coil 74 are disposed corresponding to each other, and the third inductive coil 84 and the fourth inductive coil 83 are disposed corresponding to each other.

Specifically, the first PCB bracket 9 and the second PCB bracket 10 are cylindrical, and the first PCB bracket 9, the second PCB bracket 10, the sleeve 4 and the center shaft 1 are disposed on the same axis line.

Specifically, the first inductive coil 73 and the second inductive coil 74 are on the same plane perpendicular to the central axis of the central axis.

Specifically, the third inductive coil 84 and the fourth inductive coil 83 are on the same plane perpendicular to the central axis of the central axis.

Specifically, the sleeve 4 and the bowl 3 are connected by a spline 11 .

Specifically, one end of the second PCB holder 10 is further provided with a magnet 12, and a magnetic sensor 13 is disposed at a position of one end of the first PCB holder 9 corresponding to the magnet 12, the magnetic induction The device 13 is connected to the controller 5.

Specifically, the test direction of the strain gauge 6 and the axis of the middle shaft 1 are arranged parallel to each other.

Specifically, the test direction of the strain gauge 6 and the axis of the middle shaft 1 are perpendicular to each other.

Specifically, the test direction of the strain gauge 6 and the axis of the middle shaft 1 are disposed at an angle to each other.

The working principle of the utility model is described below. The strain gauge 6 is directly attached to the central shaft 1 to sense the slight deformation generated when the middle axle 1 is subjected to the torque applied by the rider, and a sensing signal is emitted. The measurement signal is transmitted through the signal amplification circuit 81, the voltage-frequency conversion circuit 82 to the fourth inductance coil 83, and the fourth inductance coil 83 transmits the sensing signal to the third inductance coil 84, and the third inductance coil 84 outputs the sensing signal to The frequency-to-voltage conversion circuit 85, the signal demodulation circuit 85 converts the sensed signal into an analog form and outputs it to the controller 5. When the test direction of the strain gauge 6 and the axis of the middle shaft 1 are arranged in parallel with each other, the bending moment of the shaft 1 during the test can be completed; when the test direction of the strain gauge 6 is perpendicular to the axis of the center shaft 1, the test shaft can be completed. When the test direction of the strain gauge 6 and the axis of the center shaft 1 are at an angle to each other, the bending moment of the shaft 1 in the test can be completed, and the twisting moment of the shaft 1 in the test can be completed.

The above description of the technical content of the present invention is further illustrated by the embodiments, so that the reader can understand the present invention more easily, but the embodiment of the present invention is not limited thereto, and any technology according to the present invention is extended or recreated. , are protected by the utility model.

Claims

A central axis torque measuring device comprises a central shaft, a bearing for supporting the rotation of the central shaft, a tooth bowl for mounting the bearing, a sleeve and a controller, and is characterized in that the same comprises a strain gauge, a non-contact voltage module, and a non-contact torque signal transmission. a module, a first PCB bracket and a second PCB bracket, the strain gauge being attached to the central shaft;

The non-contact voltage module is used for supplying a working voltage to the strain gauge, and the non-contact voltage module comprises a DC power source, an oscillating circuit and a first inductor coil, a second inductor coil, a rectification voltage regulator circuit, a DC power source, an oscillating circuit and a first inductor coil. Connected, the second inductor coil is connected to the rectifier voltage regulator circuit;

The non-contact torque signal transmission module is configured to output a torque signal collected by the strain gauge to the controller, where the non-contact torque signal transmission module includes a signal amplification circuit, a voltage-frequency conversion circuit, a fourth inductance coil, a third inductance coil, and a frequency. a voltage conversion circuit; a fourth inductor coil, a voltage-frequency conversion circuit, a signal amplifying circuit and a strain gauge are sequentially connected, and the frequency-voltage conversion circuit is respectively connected with the third inductor coil and the controller;

The rectifying and stabilizing circuit is sequentially connected with the voltage-frequency conversion circuit, the signal amplifying circuit and the strain gauge;

The first PCB holder is disposed on the sleeve, the first inductor coil, the oscillating circuit, the third inductor coil and the voltage-frequency conversion circuit are disposed on the first PCB bracket, and the first inductor coil and the third inductor coil are respectively set At both ends of the first PCB holder;

The second PCB bracket is disposed on the central axis, and the second inductor coil, the rectifier voltage regulator circuit, the signal amplifying circuit, the voltage-frequency conversion circuit, and the fourth inductor coil are disposed on the second PCB bracket, and the second inductor coil And the fourth inductor coils are respectively disposed at both ends of the second PCB bracket;

The first inductive coil and the second inductive coil are disposed corresponding to each other, and the third inductive coil and the fourth inductive coil are disposed corresponding to each other.
The central axis torque measuring device according to claim 1, wherein the first PCB bracket and the second PCB bracket are cylindrical, and the first PCB bracket, the second PCB bracket, the sleeve and the central shaft are in the same axial line. Settings.
The center axis torque measuring device according to claim 2, wherein the first inductive coil and the second inductive coil are in a same plane perpendicular to a central axis of the central axis.
The center axis torque measuring device according to claim 2, wherein the third inductive coil and the fourth inductive coil are in a same plane perpendicular to a central axis of the central axis.
The center axis torque measuring device according to claim 2, wherein the sleeve and the bowl are splined.
The central axis torque measuring device according to claim 2, wherein one end of the second PCB holder is further provided with a magnet, and one end of the first PCB holder corresponds to the position of the magnet A magnetic sensor is provided thereon, and the magnetic sensor is connected to the controller.
The center axis torque measuring device according to any one of claims 1, 2, 3, 4, 5 or 6, wherein the test direction of the strain gauge and the axis of the center shaft are arranged parallel to each other.
The center axis torque measuring device according to any one of claims 1, 2, 3, 4, 5 or 6, wherein the test direction of the strain gauge is perpendicular to the axis of the center shaft.
The center axis torque measuring device according to any one of claims 1, 2, 3, 4, 5 or 6, wherein the test direction of the strain gauge and the axis of the center shaft are disposed at an angle to each other.