A friction torque testing device

Abstract

The present application relates to a kind of friction torque testing device, belong to universal joint testing field, solve the problem that existing technology cannot effectively test the friction torque of universal joint.The present application includes base, clamping unit, measuring unit and control box, the clamping unit, measuring unit and control box are all fixedly installed on base, the clamping unit is used to clamp the universal joint to be tested, and also be used to adjust the test angle of universal joint;The measuring unit is oppositely arranged with clamping unit, and the measuring unit is used to test the friction torque of universal joint;Controller is provided in the control box, the controller is connected with measuring unit, is used to control the friction torque test that measuring unit carries out to universal joint, and exports test result.The present application realizes the effective friction torque test to universal joint, it is easy to operate, improves the production manufacturing efficiency of universal joint.

Description

Technical Field

[0001] This invention relates to the field of universal joint testing technology, and more particularly to a friction torque testing device. Background Technology

[0002] With the development of technology, the requirements for precise transmission are becoming increasingly stringent. Universal joints are a type of efficient transmission structure. However, for universal joints with precise transmission requirements (whose frictional torque is less than 4.5 gf·cm), there is currently a lack of testing devices for their frictional torque. This makes it impossible to effectively understand the precision of the universal joints, which restricts the manufacturing of high-precision universal joints. Summary of the Invention

[0003] Based on the above analysis, the present invention aims to provide a friction torque testing device to solve the problem that the prior art cannot effectively test the friction torque of universal joints.

[0004] The objective of this invention is mainly achieved through the following technical solutions:

[0005] A friction torque testing device is provided for testing the friction torque of a single shaft of a universal joint. The device includes a base, a measuring unit, and a control box. Both the measuring unit and the control box are fixedly mounted on the base. The measuring unit is used to perform friction torque testing on the universal joint. The control box contains a controller connected to the measuring unit, which controls the measuring unit's friction torque testing of the universal joint and outputs the test results.

[0006] Furthermore, the measuring unit includes a first testing mechanism and a second testing mechanism. The first testing mechanism is used to test the frictional torque when the universal joint rotates in the forward direction, and the second testing mechanism is used to test the frictional torque when the universal joint rotates in the negative direction.

[0007] Furthermore, both the first and second testing mechanisms are arranged parallel to the base.

[0008] Furthermore, the first testing mechanism and the second testing mechanism are located in the same vertical plane.

[0009] Furthermore, the measuring unit also includes a reset mechanism for restoring the universal joint to the test angle.

[0010] Furthermore, the first testing mechanism includes a first slide, a first drive motor, a first reducer, a first lead screw, a first slide table, a first support rod, and a first force-applying end column.

[0011] Furthermore, the second testing mechanism includes a second slide, a second drive motor, a second reducer, a second lead screw, a second slide table, a second support rod, and a second force-applying end column.

[0012] 8. Further, the reset mechanism includes a third slide, a third drive motor, a third reducer, a third lead screw, a third slide table, and a reset rod.

[0013] Furthermore, the base includes a base body, balancing feet, and a level indicator.

[0014] Furthermore, at least one level indicator is provided.

[0015] The technical solution of this invention can achieve at least one of the following effects:

[0016] (1) The present invention provides a friction torque testing device, comprising a base, a clamping unit, a measuring unit, and a control box. The clamping unit, the measuring unit, and the control box are all fixedly mounted on the base. The clamping unit is used to clamp the universal joint to be tested and also to adjust the testing angle of the universal joint. The measuring unit is arranged opposite to the clamping unit and is used to perform friction torque testing on the universal joint. The control box contains a controller, which is connected to the measuring unit and is used to control the measuring unit to perform friction torque testing on the universal joint and output the test results. The present invention achieves effective friction torque testing on universal joints, is easy to operate, and improves the production efficiency of universal joints.

[0017] (2) The clamping unit of the present invention includes a frame and a clamp. The clamp includes a clamping mechanism and a centering mechanism. The frame is fixedly installed on the base body. The clamping mechanism is mounted on the frame and rotatably connected to the frame. The clamping mechanism is used to clamp the outer frame of the universal joint. The centering mechanism is detachably installed on the internal rotating part of the universal joint and is used to keep the plane of the internal rotating part of the universal joint perpendicular to the plane of the base body.

[0018] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0019] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0020] Figure 1 This is a schematic diagram of the universal joint structure in an embodiment of the present invention;

[0021] Figure 2This is a schematic diagram of the test device in an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the base structure in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the clamping unit in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the clamping fixture in an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the centering fixture in an embodiment of the present invention;

[0026] Figure 7 This is one of the structural schematic diagrams of the measuring unit in an embodiment of the present invention;

[0027] Figure 8 This is a second schematic diagram of the structure of the measuring unit in an embodiment of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the first testing mechanism in an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the second testing mechanism in an embodiment of the present invention;

[0030] Figure 11 This is a schematic diagram of the reset mechanism in an embodiment of the present invention.

[0031] Figure label:

[0032] 1-Base; 11-Base body; 12-Balance foot; 13-Level indicator; 2-Clamping unit; 21-Frame; 22-Clamping mechanism; 221-Clamping frame; 222-Positioning pin; 223-Fasting knob; 23-Centering mechanism; 231-Centering fixture; 2311-First contact post; 2312-Second contact post; 2313-Reset hole; 232-Counterweight; 24-Angle adjustment mechanism; 241-Rotating disk; 242-Mounting platform; 243-Positioning knob; 3-Measuring unit; 31-First testing mechanism; 311-First slide; 312-First drive motor; 313-First reducer; 314-First lead screw; 315-First slide; 316-First support rod; 317 318-First force-applying end column; 319-First guide plate; 32-First torque detection sensor; 32-Second testing mechanism; 321-Second slide rail; 322-Second drive motor; 323-Second reducer; 324-Second lead screw; 325-Second slide table; 326-Second support rod; 327-Second force-applying end column; 328-Second guide plate; 329-Second torque detection sensor; 33-Reset mechanism; 331-Third slide rail; 332-Third drive motor; 333-Third reducer; 334-Third lead screw; 335-Third slide table; 336-Reset rod; 337-Third guide plate; 34-Mounting bracket; 35-Mounting base; 4-Control box; 100-Universal joint; 101-Outer frame; 102-Internal rotating part. Detailed Implementation

[0033] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0034] Example 1

[0035] A specific embodiment of the present invention discloses a friction torque testing device for testing the friction torque of a universal joint 100, such as... Figure 1 As shown, the universal joint 100 includes an outer frame 101 and an inner rotating component 102. The inner rotating component 102 is disposed inside the outer frame 101 and is rotatably connected to the outer frame 101; as Figure 2As shown, the testing device includes a base 1, a clamping unit 2, a measuring unit 3, and a control box 4. The clamping unit 2, measuring unit 3, and control box 4 are all fixedly mounted on the base 1. The clamping unit 2 and measuring unit 3 are arranged horizontally opposite each other. The clamping unit 2 is used to clamp the universal joint 100 to be tested and can also adjust the testing angle of the universal joint 100. The measuring unit 3 is used to test the friction torque of the universal joint 100 clamped by the clamping unit 2. The control box 4 contains a controller connected to the measuring unit 3, used to control the measuring unit 3 to test the friction torque of the universal joint 100. The testing device, by setting up the clamping unit 2 and the measuring unit 3, enables friction torque testing of the universal joint 100 at different testing angles. Its structure is simple, operation is convenient, and it improves testing efficiency and accuracy, thereby increasing the manufacturing efficiency of the universal joint 100.

[0036] Preferably, such as Figure 3 As shown, the base 1 includes a base body 11 and multiple balancing legs 12. The multiple balancing legs 12 are fixedly installed on the lower surface of the base body 11. By adjusting the balancing legs 12, the plane on which the base body 11 is located is always kept parallel to the ground plane, thereby improving the testing accuracy of the testing device for the friction torque of the universal joint 100. At the same time, the multiple balancing legs 12 are in contact with the ground, which can also improve the stability of the base body 11 support, thereby improving the stability of the operation of the testing device and improving the testing accuracy.

[0037] Preferably, the base 1 further includes a level indicator 13, which is fixedly installed on the upper surface of the base body 11 to display the parallelism between the plane of the base body 11 and the ground. This improves the efficiency and accuracy of adjusting the plane of the base body 11 to be parallel to the ground, thereby improving the testing efficiency and accuracy of the testing device for the friction torque of the universal joint 100. Two level indicators 13 are provided and located diagonally on the base body 11, which can further improve the accuracy of adjusting the plane of the base body 11 to be parallel to the ground, thereby further improving the testing efficiency and accuracy of the testing device for the friction torque of the universal joint 100.

[0038] Preferably, such as Figure 4As shown, the clamping unit 2 includes a frame 21 and a clamp. The clamp includes a clamping mechanism 22 and a centering mechanism 23. The frame 21 is fixedly mounted on the base body 11. The clamping mechanism 22 is mounted on the frame 21 and rotatably connected to the frame 21. The clamping mechanism 22 is used to clamp the outer frame 101 of the universal joint 100 and connect the universal joint 100 to the testing device. The centering mechanism 23 is detachably mounted on the internal rotating part 102 of the universal joint 100. Under its own weight, it is used to keep the plane of the internal rotating part 102 of the universal joint 100 perpendicular to the plane of the base body 11.

[0039] Preferably, such as Figure 5 As shown, the clamping mechanism 22 includes a clamping frame 221, a positioning pin 222, and a fastening knob 223. The clamping frame 221 includes a horizontal beam and vertical beams (the one parallel to the plane of the base body 11 is the horizontal beam, and the others are vertical beams). The vertical beams are rotatably connected to the frame 21 via pins. The positioning pin 222 is installed on one of the horizontal beams of the clamping frame 221 and can cooperate with the positioning hole on the outer frame 101 of the universal joint 100 to position the universal joint 100, so that the rotation axis of the internal rotating part 102 in the universal joint 100 is aligned with the clamping frame 221. The rotation axes are collinear, and the plane of the outer frame 101 of the universal joint 100 is parallel to the plane of the clamping frame 221. In this embodiment, it is preferable that the plane of the outer frame 101 of the universal joint 100 is coplanar with the plane of the clamping frame 221. The fastening knob 223 is rotatably connected to another crossbeam of the clamping frame 221. By tightening the knob 223, the outer frame 101 of the universal joint 100 can be pressed against it, thereby fixing the universal joint 100 on the clamping frame 221 and allowing the outer frame 101 of the universal joint 100 to rotate synchronously with the clamping frame 221.

[0040] Preferably, such as Figure 6The centering and alignment mechanism 23 includes a centering and alignment fixture 231. One end face of the fixture 231 has a first contact post 2311, a second contact post 2312, and a reset hole 2313. The first contact post 2311 and the second contact post 2312 are located on the same vertical plane and are distributed on both sides of the rotation axis of the clamping frame 221. The first contact post 2311 and the second contact post 2312 are used to receive the pushing force applied by the measuring unit 3, thereby pushing the internal rotating component 102 of the universal joint 100 to rotate relative to the outer frame 101. The distance from the axis of the first contact post 2311 to the rotation axis of the clamping frame 221 is equal to the distance from the axis of the second contact post 2312 to the rotation axis of the clamping frame 221. This can improve the consistency of force applied by the testing device when testing the friction torque of the universal joint 100, thereby improving the accuracy of the testing device in testing the friction torque of the universal joint 100. The reset hole 2313 corresponds to the reset rod 336 of the reset mechanism 33 in the measuring unit 3, and cooperates with the reset mechanism 33 to quickly reset the internal rotating part 102 in the universal joint 100, so that the plane where the internal rotating part 102 is located always remains perpendicular to the plane where the base body 11 is located, so that the internal rotating part 102 quickly returns to the initial position under the test angle, thereby improving the consistency of force applied by the testing device when testing the friction torque of the universal joint 100 under different test angles, thereby improving the testing efficiency and testing accuracy of the testing device in testing the friction torque of the universal joint 100.

[0041] Preferably, the centering and aligning mechanism 23 further includes a counterweight 232, which is detachably mounted on the end face of the other end of the centering and aligning fixture 231. The counterweight 232 is used to balance the internal rotating component 102 of the universal joint 100. Under the gravity of the counterweight 232, the plane of the internal rotating component 102 of the universal joint 100 can be automatically kept perpendicular to the plane of the base body 11.

[0042] Preferably, the clamping unit 2 further includes an angle adjustment mechanism 24, which is rotatably mounted on the frame 21 and fixedly connected to the rotation axis of the clamping frame 221 in the clamping mechanism 22. By rotating the angle adjustment mechanism 24, the angle between the plane of the clamping frame 221 and the plane of the base body 11 can be adjusted, so that the plane of the internal rotating part 102 of the universal joint 100 and the plane of the outer frame 101 are at different test angles, thereby realizing the friction torque test of the universal joint 100 at different test angles, and thus improving the comprehensiveness of the test device for the friction torque test of the universal joint 100.

[0043] Preferably, the angle adjustment mechanism 24 includes a rotating disk 241, a mounting platform 242, and a positioning knob 243. The rotating disk 241 is rotatably connected to the frame 21 and fixedly connected to the clamping frame 221 via a rotating shaft. The mounting platform 242 is mounted on the frame 21 and is correspondingly arranged to the rotating disk 241. The positioning knob 243 is rotatably connected to the mounting platform 242 and is arranged radially along the rotating disk 241. Rotating the rotating disk 241 can adjust the angle between the plane of the clamping frame 221 and the plane of the base body 11. The positioning knob 243 tightens the rotating disk 241, fixing it relative to the frame 21. This allows the plane of the clamping frame 221 to maintain different angles with the plane of the base body 11. Under the gravity of the centering mechanism 23, the plane of the internal rotating part 102 of the universal joint 100 and the plane of the outer frame 101 can maintain different test angles. This enables friction torque testing of the universal joint 100 at different test angles, thereby improving the comprehensiveness of the testing device for friction torque testing of the universal joint 100.

[0044] Preferably, the rotating disk 241 has an angle scale line at its edge, and the positioning knob 243 also cooperates with the angle scale line to display the angle between the plane where the current clamping frame 221 is located and the plane where the base body 11 is located, that is, to display the test angle value between the plane where the internal rotating part 102 of the current universal joint 100 is located and the plane where the outer frame 101 is located, thereby improving the accuracy of testing the friction torque of the universal joint 100 at different angles.

[0045] Preferably, such as Figure 7 and Figure 8As shown, the measuring unit 3 includes a first testing mechanism 31, a second testing mechanism 32, a reset mechanism 33, a mounting frame 34, and a mounting base 35. Both the mounting frame 34 and the mounting base 35 are fixedly mounted on the upper surface of the base body 11, with the mounting base 35 located inside the mounting frame 34. The first testing mechanism 31 is fixedly mounted on the inner side of the top wall of the mounting frame 34 and is horizontally opposite to the first contact post 2311 in the centering and aligning mechanism 23 clamped on the universal joint 100. The first testing mechanism 31 is used to test the frictional torque when the universal joint 100 rotates in the forward direction (with clockwise rotation of the internal rotating component 102 in the universal joint 100 as the forward direction). The second testing mechanism 32 is fixedly mounted on the mounting base 35 and is located in the same vertical plane as the first testing mechanism 31, and is parallel to and corresponding to the first testing mechanism 31 in this plane. The second testing mechanism 32 and the second contact post 2312 in the centering and aligning mechanism 23 clamped on the universal joint 100 are horizontally opposite to each other, i.e., the first testing mechanism 31... The distance between the first contact post 2311 and the second contact post 2312 is equal to the distance between the first contact post 2311 and the second contact post 2312. The second test mechanism 32 is used to test the friction torque when the universal joint 100 rotates in the negative direction (with the counterclockwise rotation of the internal rotating part 102 in the universal joint 100 as the negative direction). The reset mechanism 33 is fixedly installed on the inner side of one of the side walls of the mounting bracket 34 and is arranged in the horizontal direction opposite to the reset hole 2313 in the centering mechanism 23 clamped on the universal joint 100. It is used to quickly reset the internal rotating part 102 in the universal joint 100, so that the plane where the internal rotating part 102 in the universal joint 100 is located is kept perpendicular to the plane where the base body 11 is located. This allows the internal rotating part 102 of the universal joint 100 to quickly return to the initial position under the test angle, thereby improving the consistency of the force applied when the test device tests the friction torque of the universal joint 100 under different test angles, and thus improving the test efficiency and test accuracy of the test device for testing the friction torque of the universal joint 100.

[0046] Preferably, such as Figure 9As shown, the first testing mechanism 31 includes a first slide groove 311, a first drive motor 312, a first reducer 313, a first lead screw 314, a first slide table 315, a first support rod 316, and a first force-applying end column 317. The first slide groove 311 is fixedly installed on the inner side of the top wall of the mounting bracket 34, parallel to the plane of the base body 11, and extends towards the centering mechanism 23. The first drive motor 312, the first reducer 313, and the first lead screw 314 are connected in sequence. The first lead screw 314 is mounted in the first slide groove 311 and rotatably connected to the first slide groove 311. The first slide table 315 is slidably installed in the first slide groove 311 and sleeved on the first lead screw 314, and threadedly connected to the first lead screw 314. One end of the first support rod 316 is connected to the first slide table 315. One end is fixedly connected to the other end, and the other end is fixedly connected to the first force-applying end post 317. The axis of the first force-applying end post 317 is collinear with the axis of the first contact post 2311 in the centering and aligning mechanism 23 clamped on the universal joint 100. The first drive motor 312 drives the first lead screw 314 to rotate through the first reducer 313, thereby driving the first slide table 315 to move the first force-applying end post 317 along the first slide groove 311 toward or away from the centering and aligning mechanism 23. When the first drive motor 312 drives the first force-applying end post 317 toward the centering and aligning mechanism 23, the first force-applying end post 317 pushes the first contact post 2311 in the centering and aligning mechanism 23 to drive the internal rotating part 102 of the universal joint 100 to rotate forward at the test angle, thereby testing the friction torque of the universal joint 100 rotating forward.

[0047] Preferably, the first testing mechanism 31 further includes a first guide plate 318, which is fastened to the first slide groove 311 to prevent foreign objects from entering the first slide groove 311 and avoid affecting the testing accuracy of the friction torque of the universal joint 100. At the same time, it can also guide the sliding direction of the first slide table 315 so that the first force-applying end column 317 can move along the first guide plate 318 toward or away from the centering mechanism 23.

[0048] Preferably, the first testing mechanism 31 further includes a first torque detection sensor 319, which is mounted on the first force-applying end post 317. The first torque detection sensor 319 is used to detect the torque when the first force-applying end post 317 pushes the internal rotating part 102 of the universal joint 100 to rotate in the forward direction at the test angle, and transmits the detected result to the controller. After calculation by the controller, the friction torque of the universal joint 100 at the test angle is output.

[0049] Preferably, such as Figure 10As shown, the second testing mechanism 32 includes a second slide groove 321, a second drive motor 322, a second reducer 323, a second lead screw 324, a second slide table 325, a second support rod 326, and a second force-applying end column 327. The second slide groove 321 is fixedly installed on the mounting base 35 and is parallel to the first slide groove 311 in the first testing mechanism 31, and extends towards the centering and aligning mechanism 23. The second drive motor 322, the second reducer 323, and the second lead screw 324 are connected in sequence. The second lead screw 324 is mounted in the second slide groove 321 and rotatably connected to the second slide groove 321. The second slide table 325 is slidably installed in the second slide groove 321 and sleeved on the second lead screw 324, and threadedly connected to the second lead screw 324. One end of the second support rod 326 is connected to the second slide table 325. 25 is fixedly connected, and the other end is fixedly connected to the second force-applying end post 327. The axis of the second force-applying end post 327 is collinear with the axis of the second contact post 2312 in the centering and aligning mechanism 23 clamped on the universal joint 100. The second drive motor 322 drives the second lead screw 324 to rotate through the second reducer 323, thereby driving the second slide table 325 to move the second force-applying end post 327 along the second slide groove 321 toward or away from the centering and aligning mechanism 23. When the second drive motor 322 drives the second force-applying end post 327 toward the centering and aligning mechanism 23, the second force-applying end post 327 pushes the second contact post 2312 in the centering and aligning mechanism 23 to drive the internal rotating part 102 of the universal joint 100 to rotate in the negative direction at the test angle, thereby testing the friction torque of the universal joint 100 rotating in the negative direction.

[0050] Preferably, the second testing mechanism 32 further includes a second guide plate 328, which is fastened to the second slide groove 321. This prevents foreign objects from entering the second slide groove 321 and avoids affecting the testing accuracy of the friction torque of the universal joint 100. At the same time, it can also guide the sliding direction of the second slide table 325, so that the second force-applying end post 327 can move along the second guide plate 328 toward or away from the clamping unit 2.

[0051] Preferably, the second testing mechanism 32 further includes a second torque detection sensor 329, which is mounted on the second force-applying end post 327. The second torque detection sensor 329 is used to detect the torque when the second force-applying end post 327 pushes the internal rotating part 102 of the universal joint 100 to rotate in the forward direction at the test angle, and transmits the detected result to the controller. After calculation by the controller, the friction torque of the universal joint 100 at the test angle is output.

[0052] Preferably, such as Figure 11As shown, the reset mechanism 33 includes a third slide groove 331, a third drive motor 332, a third reducer 333, a third lead screw 334, a third slide table 335, and a reset rod 336. The third slide groove 331 is fixedly installed on the inner side of one side wall of the mounting frame 34, parallel to the first slide groove 311 in the first test mechanism 31, and extends towards the centering and aligning mechanism 23. The third drive motor 332, the third reducer 333, and the third lead screw 334 are connected in sequence, and the third lead screw 334 is mounted on a frame. The third slide table 335 is slidably installed in the third slide table 331 and sleeved on the third lead screw 334, and threadedly connected to the third lead screw 334; one end of the reset rod 336 is fixedly connected to the third slide table 335, and the other end is coaxially arranged with the reset hole 2313 in the centering and aligning mechanism 23 clamped on the universal joint 100, and can be inserted into the reset hole 2313; the third drive motor 332 drives the third slide table 335 through the third reducer 333. The three lead screws 334 rotate, thereby driving the third slide groove 331 to move the reset rod 336 along the third slide groove 331 toward or away from the centering mechanism 23. When the third drive motor 332 drives the reset rod 336 toward the centering mechanism 23, the reset rod 336 is inserted into the reset hole 2313 in the centering mechanism 23, quickly resetting the internal rotating part 102 in the universal joint 100, so that the plane of the internal rotating part 102 in the universal joint 100 always remains aligned with the plane of the base body 11. The perpendicularity of the plane ensures that the plane containing the internal rotating component 102 of the universal joint 100 maintains a test angle with the plane containing the outer frame 101. This improves the consistency of the force applied by the first test mechanism 31 and the second test mechanism 32 when testing the friction torque of the universal joint 100 at different test angles. At the same time, it can also eliminate the interference error of the internal friction torque and gravity factors of the test device on the friction torque test results of the universal joint 100, thereby improving the test accuracy of the test device for testing the friction torque of the universal joint 100.

[0053] The reset mechanism 33 also includes a third guide plate 337, which is fastened to the third slide groove 331. This prevents foreign objects from entering the third slide groove 331 and avoids affecting the testing accuracy of the friction torque of the universal joint 100. At the same time, it can also guide the sliding direction of the third slide table 335, so that the reset rod 336 can move along the third guide plate 337 toward or away from the centering mechanism 23.

[0054] Preferably, the first drive motor 312, the second drive motor 322 and the third drive motor 332 are all stepper motors; the first drive motor 312, the second drive motor 322 and the third drive motor 332 are all connected to a controller, and the controller can control the start and stop of the first drive motor 312, the second drive motor 322 and the third drive motor 332.

[0055] Preferably, magnetic blocks are provided on the opposite end faces of the first force-applying end post 317 and the first contact post 2311, as well as on the opposite end faces of the second force-applying end post 327 and the second contact post 2312. The magnetic poles of the opposite faces of the two opposing magnetic blocks are the same. This can prevent the first force-applying end post 317 from directly contacting the first contact post 2311 and the second force-applying end post 327 from directly contacting the second contact post 2312 when the testing device performs friction torque testing on the universal joint 100. This can prevent wear on the first force-applying end post 317, the first contact post 2311, the second force-applying end post 327, and the second contact post 2312, thereby extending the service life of the testing device.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A friction torque testing device, characterized in that, The test assembly for measuring the frictional torque of a single shaft of a universal joint (100) includes a base (1), a measuring unit (3), and a control box (4). The measuring unit (3) and the control box (4) are both fixedly mounted on the base (1). The measuring unit (3) is used to test the frictional torque of the universal joint (100). The control box (4) contains a controller, which is connected to the measuring unit (3) and is used to control the measuring unit (3) to perform the frictional torque test on the universal joint (100) and output the test results. The measuring unit (3) includes a first testing mechanism (31) and a second testing mechanism (32). The first testing mechanism (31) is used to test the friction torque when the universal joint (100) rotates in the positive direction, and the second testing mechanism (32) is used to test the friction torque when the universal joint (100) rotates in the negative direction. The first testing mechanism (31) includes a first force-applying end column (317); the second testing mechanism (32) includes a second force-applying end column (327). The universal joint (100) is equipped with a centering mechanism (23); the centering mechanism (23) includes a first contact post (2311) and a second contact post (2312), which are used to receive the pushing force applied by the measuring unit (3).

2. The friction torque testing device according to claim 1, characterized in that, The first test mechanism (31) and the second test mechanism (32) are both arranged parallel to the base (1).

3. The friction torque testing device according to claim 2, characterized in that, The first test mechanism (31) and the second test mechanism (32) are located in the same vertical plane.

4. The friction torque testing device according to claim 3, characterized in that, The measuring unit (3) also includes a reset mechanism (33) for restoring the universal joint (100) to the test angle.

5. The friction torque testing device according to claim 4, characterized in that, The first testing mechanism (31) includes a first slide (311), a first drive motor (312), a first reducer (313), a first lead screw (314), a first slide table (315), and a first support rod (316).

6. The friction torque testing device according to claim 4, characterized in that, The second testing mechanism (32) includes a second slide (321), a second drive motor (322), a second reducer (323), a second lead screw (324), a second slide table (325), and a second support rod (326).

7. The friction torque testing device according to claim 4, characterized in that, The reset mechanism (33) includes a third slide (331), a third drive motor (332), a third reducer (333), a third lead screw (334), a third slide table (335), and a reset rod (336).

8. The friction torque testing device according to claim 1, characterized in that, The base (1) includes a base body (11), a balancing support (12), and a level indicator (13).

9. The friction torque testing device according to claim 8, characterized in that, At least one horizontal indicator (13) shall be provided.

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