A bearing friction torque measuring device

Abstract

The present invention relates to the field of bearing detection technology, and in particular to a bearing friction torque measuring device, wherein the torque measuring module comprises an elastic inner ring positioning shaft and a base; a DC motor and a cylindrical torque sensor are fixed to the base; a jacket fixing plate is fixed to the measuring end of the torque sensor; an elastic outer ring positioning sleeve is fixed to the jacket fixing plate; a rotating shaft is fixed to the output end of the DC motor; the rotating shaft passes through the inner cavity of the torque sensor and is fixedly connected to the elastic inner ring positioning shaft inside the elastic outer ring positioning sleeve. When the present invention is used, the installation error of the bearing can be effectively compensated, the additional force brought by the fixture to the bearing to be measured can be reduced, the influence of mechanical vibration during the test can be reduced, and the measurement accuracy can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing detection, and in particular to a bearing friction torque measuring device. Background Art

[0002] With the development of precision machinery technology, the requirements for the accuracy and mechanical properties of basic mechanical parts - bearings and bearing assemblies have been further improved. The rotational friction torque of the bearing is an important indicator for measuring the accuracy and kinematic characteristics of the bearing, and is of great significance for the evaluation of bearing accuracy and accuracy retention. Therefore, the demand for the measurement of friction torque is more common.

[0003] The main methods for measuring bearing friction are balance measurement method and transfer measurement method.

[0004] The balancing measurement method uses an external force to balance the friction force generated by the rotation of the bearing, and then calculates the friction torque of the bearing based on the bearing diameter and the measured balancing force. This method is an indirect measurement, so there will be a certain calculation error, and different types and specifications of bearings need to change the relevant calculation parameters, which is troublesome, time-consuming and labor-intensive to operate.

[0005] The transfer measurement method is to fix the outer ring of the bearing on the torque sensor, and the upper rotary power drive mechanism applies rotary motion to the inner ring to measure the bearing friction torque. The rotary power drive mechanism must have movement adjustment and radial force and axial force elimination or compensation mechanism to ensure the normal test. Therefore, the mechanical structure is relatively complex and the equipment is large. The positioning deviation during the installation of the measured bearing can easily produce additional axial or radial force, affecting the measurement accuracy of the friction torque, causing the fixture to bring additional force to the bearing, and the influence caused by mechanical vibration affects the measurement accuracy. Summary of the invention

[0006] The purpose of the present invention is to provide a bearing friction torque measuring device in view of the defects and shortcomings of the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] The present invention discloses a bearing friction torque measuring device, which comprises a frame and a torque measuring module fixed inside the frame; the torque measuring module comprises an elastic inner ring positioning shaft and a base; the base is fixed with a DC motor and a cylindrical torque sensor; the measuring end of the torque sensor is fixed with an outer sleeve fixing plate; the outer sleeve fixing plate is fixed with an elastic outer ring positioning sleeve; the output end of the DC motor is fixed with a rotating shaft; the rotating shaft passes through the inner cavity of the torque sensor and is fixedly connected with the elastic inner ring positioning shaft inside the elastic outer ring positioning sleeve.

[0009] Furthermore, the elastic inner ring positioning shaft and the elastic outer ring positioning sleeve are both made of rubber material.

[0010] Furthermore, the top end surface of the elastic inner ring positioning shaft is higher than the top end surface of the elastic outer ring positioning sleeve.

[0011] Furthermore, the inner hole diameter of the elastic outer ring positioning sleeve gradually increases with the end away from the outer sleeve fixing plate; the shaft diameter of the elastic inner ring positioning shaft gradually increases with the end close to the rotating shaft.

[0012] Furthermore, the torque sensor is externally sleeved with a protective cover; the protective cover is fixed on the base.

[0013] Furthermore, a door hole is provided on the front surface of the frame; and a safety door is provided on the outer side surface of the door hole.

[0014] Furthermore, guide rails extending in the horizontal direction are fixed to the front surface and the upper surface of the frame; a slider matching the guide rails is fixed to the safety door; and the slider is embedded in the guide rails.

[0015] Furthermore, a control console is arranged inside the frame; the control console is fixed on the torque measurement module.

[0016] Furthermore, an open groove is provided on the top end surface of the elastic outer ring positioning sleeve; and the open groove penetrates the side surface of the elastic outer ring positioning sleeve.

[0017] After adopting the above structure, the beneficial effects of the present invention are as follows: the bearing friction torque measuring device described in the present invention, the torque measuring module includes an elastic inner ring positioning shaft and a base; the base is fixed with a DC motor and a cylindrical torque sensor; the measuring end of the torque sensor is fixed with an outer sleeve fixing plate; the outer sleeve fixing plate is fixed with an elastic outer ring positioning sleeve; the output end of the DC motor is fixed with a rotating shaft; the rotating shaft passes through the inner cavity of the torque sensor and is fixedly connected with the elastic inner ring positioning shaft inside the elastic outer ring positioning sleeve. When the present invention is used, the elastic inner ring positioning shaft, the elastic outer ring positioning sleeve, the rotating shaft and the torque sensor are coaxially arranged; the bearing to be tested is inserted between the elastic outer ring positioning sleeve and the elastic inner ring positioning shaft, and the outer ring of the bearing to be tested is tightly fixed on the inner side wall of the elastic outer ring positioning sleeve; the DC motor is started, and the power is transmitted to the inner ring of the bearing to be tested through the rotating shaft and the elastic inner ring positioning shaft, so that the inner ring of the bearing to be tested rotates, and the inner ring of the bearing to be tested is transmitted to the outer ring of the bearing to be tested through the measured friction force; the outer ring of the bearing to be tested has a tendency to rotate, and the torque of the outer ring of the bearing to be tested is transmitted to the torque sensor through the outer sleeve fixing plate to measure the friction torque borne by the outer ring of the bearing to be tested; the elastic inner ring positioning shaft and the elastic outer ring positioning sleeve are both made of elastic materials, which can effectively compensate for the installation error of the bearing, reduce the additional force brought by the fixture to the bearing to be tested, reduce the influence of mechanical vibration in the test, and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a first perspective stereogram of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure after the safety door is removed in the present invention;

[0020] Figure 3 It is a structural diagram of the torque measurement module;

[0021] Figure 4 is a cross-sectional view of the torque measurement module;

[0022] Figure 5 It is a schematic diagram of the structure of the elastic inner ring positioning shaft;

[0023] Figure 6 It is a schematic diagram of the structure of the elastic outer ring positioning sleeve;

[0024] Figure 7 is a functional block diagram in this application;

[0025] Description of reference numerals:

[0026] 1. Safety door; 2. Rack; 201. Door hole; 3. Slider; 4. Guide rail; 5. Console;

[0027] A, torque measurement module; A1, elastic inner ring positioning shaft; A2, elastic outer ring positioning sleeve;

[0028] A201, opening slot; A3, protective cover; A4, base; A5, jacket fixing plate; A6, rotating shaft;

[0029] A7, torque sensor; A8, DC motor; B, bearing to be tested. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 7 As shown, a bearing friction torque measuring device described in the present invention includes a frame 2 and a torque measuring module A fixed inside the frame 2; the torque measuring module A includes an elastic inner ring positioning shaft A1 and a base A4; the base A4 is fixed with a DC motor A8 and a cylindrical torque sensor A7; the torque sensor A7 has no essential difference from the prior art, so it is not described in detail; the measuring end of the torque sensor A7 is fixed with an outer sleeve fixing plate A5; the outer sleeve fixing plate A5 is fixed with an elastic outer ring positioning sleeve A2; the output end of the DC motor A8 is fixed with a rotating shaft A6; the rotating shaft A6 passes through the inner cavity of the torque sensor A7 and is fixedly connected with the elastic inner ring positioning shaft A1 inside the elastic outer ring positioning sleeve A2; the elastic inner ring positioning shaft A1, the elastic outer ring positioning sleeve A2, the rotating shaft A6 and the torque sensor A7 are coaxially arranged; The bearing B to be tested is inserted between the elastic outer ring positioning sleeve A2 and the elastic inner ring positioning shaft A1, and the outer ring of the bearing B to be tested is tightly fixed on the inner wall of the elastic outer ring positioning sleeve A2; the DC motor A8 is started, and the power is transmitted to the inner ring of the bearing B to be tested through the rotating shaft A6 and the elastic inner ring positioning shaft A1, so that the inner ring of the bearing B to be tested rotates, and the inner ring of the bearing B to be tested is transmitted to the outer ring of the bearing B to be tested through the measured friction force; the outer ring of the bearing B to be tested has a tendency to rotate, and the torque of the outer ring of the bearing B to be tested is transmitted to the torque sensor A7 through the outer sleeve fixing plate A5 to measure the friction torque borne by the outer ring of the bearing B to be tested; the elastic inner ring positioning shaft A1 and the elastic outer ring positioning sleeve A2 are both made of elastic materials, which can effectively compensate for the installation error of the bearing, reduce the additional force brought by the fixture to the bearing B to be tested, reduce the influence of mechanical vibration during the test, and improve the measurement accuracy.

[0032] As a preferred embodiment of the invention, the elastic inner ring positioning shaft A1 and the elastic outer ring positioning sleeve A2 are both made of rubber material.

[0033] As a preferred embodiment of the invention, the top end surface of the elastic inner ring positioning shaft A1 is higher than the top end surface of the elastic outer ring positioning sleeve A2; the inner ring of the bearing B to be tested is first positioned to make the bearing easier to install.

[0034] As a preferred embodiment of the invention, the inner hole diameter of the elastic outer ring positioning sleeve A2 gradually increases as it moves away from the outer sleeve fixing plate A5; the shaft diameter of the elastic inner ring positioning shaft A1 gradually increases as it moves closer to the rotating shaft A6; this not only facilitates the insertion and positioning of the bearing, but also enables the clamping of bearings of various specifications.

[0035] As a preferred embodiment of the invention, the outer sleeve of the torque sensor A7 is provided with a protective cover A3; the protective cover A3 is fixed on the base A4.

[0036] As a preferred embodiment of the invention, a door hole 201 is provided on the front surface of the frame 2 ; and a safety door 1 is provided on the outer side surface of the door hole 201 .

[0037] As a preferred embodiment of the invention, a guide rail 4 extending in a horizontal direction is fixed to the front surface of the frame 2 and the upper surface of the frame 2; a slider 3 matching the guide rail 4 is fixed to the safety door 1; the slider 3 is embedded in the guide rail 4, and the safety door 1 can slide laterally along the guide rail 4 on the frame 2.

[0038] As a preferred embodiment of the invention, a control console 5 is provided inside the frame 2; the control console 5 is fixed on the torque measurement module A; the bottom of the control console 5 is connected to the operating table outside the frame 2 through a connecting line to facilitate external control.

[0039] As a preferred embodiment of the invention, the top end surface of the elastic outer ring positioning sleeve A2 is provided with an open groove A201; the open groove A201 penetrates the side surface of the elastic outer ring positioning sleeve A2; the open groove A201 is provided to facilitate the removal of the bearing B to be tested.

[0040] When the present invention is used, the elastic inner ring positioning shaft, the elastic outer ring positioning sleeve, the rotating shaft and the torque sensor are coaxially arranged; the bearing to be tested is inserted between the elastic outer ring positioning sleeve and the elastic inner ring positioning shaft, and the outer ring of the bearing to be tested is tightly fixed on the inner side wall of the elastic outer ring positioning sleeve; the DC motor is started, and the power is transmitted to the inner ring of the bearing to be tested through the rotating shaft and the elastic inner ring positioning shaft, so that the inner ring of the bearing to be tested rotates, and the inner ring of the bearing to be tested is transmitted to the outer ring of the bearing to be tested through the measured friction force; the outer ring of the bearing to be tested has a tendency to rotate, and the torque of the outer ring of the bearing to be tested is transmitted to the torque sensor through the outer sleeve fixing plate to measure the friction torque borne by the outer ring of the bearing to be tested; the elastic inner ring positioning shaft and the elastic outer ring positioning sleeve are both made of elastic materials, which can effectively compensate for the installation error of the bearing, reduce the additional force brought by the fixture to the bearing to be tested, reduce the influence of mechanical vibration in the test, and improve the measurement accuracy.

[0041] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A bearing friction torque measuring device, characterized in that: The invention comprises a frame (2) and a torque measuring module (A) fixed inside the frame (2); the torque measuring module (A) comprises an elastic inner ring positioning shaft (A1) and a base (A4); the base (A4) is fixed with a DC motor (A8) and a cylindrical torque sensor (A7); a jacket fixing plate (A5) is fixed to the measuring end of the torque sensor (A7); an elastic outer ring positioning sleeve (A2) is fixed to the jacket fixing plate (A5); a rotating shaft (A6) is fixed to the output end of the DC motor (A8); the rotating shaft (A6) passes through the inner cavity of the torque sensor (A7) and is fixedly connected to the elastic inner ring positioning shaft (A1) inside the elastic outer ring positioning sleeve (A2); the elastic inner ring positioning shaft (A1) and the elastic outer ring positioning sleeve (A2) are both made of rubber material; and the top end surface of the elastic inner ring positioning shaft (A1) is higher than the top end surface of the elastic outer ring positioning sleeve (A2).

2. A bearing friction torque measuring device according to claim 1, characterized in that: The inner hole diameter of the elastic outer ring positioning sleeve (A2) gradually increases as the end is away from the outer sleeve fixing plate (A5); the shaft diameter of the elastic inner ring positioning shaft (A1) gradually increases as the end is close to the rotating shaft (A6).

3. A bearing friction torque measuring device according to claim 1, characterized in that: The torque sensor (A7) is externally sleeved with a protective cover (A3); the protective cover (A3) is fixed on the base (A4).

4. A bearing friction torque measuring device according to claim 1, characterized in that: The front surface of the frame (2) is provided with a door hole (201); and the outer surface of the door hole (201) is provided with a safety door (1).

5. A bearing friction torque measuring device according to claim 4, characterized in that: A guide rail (4) extending in a horizontal direction is fixed to the front surface of the frame (2) and the upper surface of the frame (2); a slider (3) matching the guide rail (4) is fixed to the safety door (1); and the slider (3) is embedded in the guide rail (4).

6. A bearing friction torque measuring device according to claim 1, characterized in that: A control console (5) is arranged inside the frame (2); the control console (5) is fixed on the torque measurement module (A).

7. The bearing friction torque measuring device according to claim 1, characterized in that: An open groove (A201) is provided on the top end surface of the elastic outer ring positioning sleeve (A2); the open groove (A201) penetrates the side surface of the elastic outer ring positioning sleeve (A2).

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