Universal axial power transmission mechanism and low-speed friction testing machine

Abstract

The utility model relates to the technical field of vibration resistance detection of automatic gearbox oil, in particular to a universal axial power transmission mechanism and a low-speed friction testing machine. The transmission mechanism comprises a base, a universal joint and an oil containing seat; the bottom side of the base is mounted on the driving cylinder, a frustum hole is formed in the top side of the base, and a steel ball is mounted in the center of the frustum hole; the universal joint is installed in the frustum hole, the outer contour of the universal joint is in a frustum shape, a set gap is formed between the outer contour of the universal joint and the frustum hole, and the bottom of the universal joint is connected to the steel ball in a pressed mode. A lower sample is arranged in the oil containing seat, an axially fixed upper sample is arranged at the top of the oil containing seat, a torque sensor is arranged between the oil containing seat and the universal joint, one end of the torque sensor is connected with the oil containing seat, and the other end of the torque sensor is connected with the universal joint. According to the utility model, the upper sample and the lower sample can be in parallel contact, the axial load is effectively transmitted, and accurate torque measurement is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic transmission oil anti-tremor detection, in particular to a universal axial power transmission mechanism and a low-speed friction testing machine. Background Art

[0002] With the development of science and technology and the improvement of people's living standards, automatic transmission vehicles are becoming more and more popular in the market due to their driving convenience and comfort. In automatic transmission vehicles, automatic transmission fluid (ATF) plays a vital role. It is not only responsible for lubricating, cooling and cleaning the transmission, but also directly affects the driving comfort of the car. Among them, the anti-shudder property of ATF is an important indicator for evaluating its performance, which is related to the smoothness of driving and the comfort of passengers.

[0003] At present, the common friction testers on the market are mainly used to test the friction characteristics of ATF. However, traditional testers have some shortcomings in design and function, and cannot fully meet the testing needs in low-speed friction environments. In particular, there are many technical challenges in the parallel contact of the specimen, axial load transfer and torque measurement during the testing process. These problems directly affect the accuracy and reliability of the test results. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a universal axial power transmission mechanism that can make the upper test specimen and the lower test specimen contact horizontally (parallel), effectively transmit the axial load and perform accurate torque measurement.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0006] A universal axial power transmission mechanism comprises: a base, a universal joint and an oil receiving seat; the bottom side of the base is mounted on a driving cylinder, a frustum hole is provided on the top side of the base, a steel ball is installed at the center of the frustum hole; the universal joint is installed in the frustum hole, the outer contour of the universal joint is a frustum shape and there is a set gap between the universal joint and the frustum hole, and the bottom of the universal joint is pressed onto the steel ball; a lower test specimen is provided in the oil receiving seat, an axially fixed upper test specimen is provided on the top of the oil receiving seat, a torque sensor is provided between the oil receiving seat and the universal joint, one end of the torque sensor is connected to the oil receiving seat, and the other end is connected to the universal joint.

[0007] Optionally, the driving cylinder is a hydraulic cylinder, which includes a cylinder body and a piston rod, wherein the piston rod is installed in the cylinder body, and the base is detachably installed at an exposed end of the piston rod.

[0008] Optionally, a bolt through hole is provided on the base, and a threaded hole is provided on the end face of the piston rod. The bolt passes through the bolt hole of the base and is installed in the threaded hole of the piston rod. The bolt through hole is a countersunk hole.

[0009] Optionally, a blind hole is provided at the center of the base, a ball seat is installed in the blind hole, an upper ball hole is provided on the top surface of the ball seat, a lower ball hole is provided on the bottom side of the universal joint, and the steel ball is installed in the upper ball hole and the lower ball hole.

[0010] Optionally, a connecting sleeve is provided on the top of the universal joint, the torque sensor is arranged between the oil reservoir and the connecting sleeve, the connecting sleeve is circumferentially fixed to the universal joint, and a stop hole is provided on the outer contour surface of the connecting sleeve.

[0011] Optionally, a cross groove is provided on the top surface of the universal joint, a cross platform is provided on the bottom of the connecting sleeve, and the cross platform of the connecting sleeve is inserted into the cross groove of the universal joint.

[0012] Optionally, the oil container includes a detachably connected oil box and a support seat, the lower sample is installed in the oil box, the oil box includes a box body, the center hole of the box body is a threaded hole, a boss is designed at the center of the support seat, the threaded hole of the oil box is threadedly installed on the boss of the support seat, and the top surface of the boss is lower than the lower sample.

[0013] Optionally, the oil box and the support seat are sealed by a sealing ring.

[0014] Optionally, a spline groove is provided in the box body, and the outer contour of the lower specimen matches the shape of the spline groove.

[0015] The embodiment of the utility model also provides a low-speed friction testing machine, including a hydraulic system, a motor and the universal axial power transmission mechanism as described above, wherein the hydraulic system provides power for the drive cylinder, and the motor drives the upper sample to rotate.

[0016] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0017] 1. The transmission mechanism transmits axial loads through universal joints, bases and steel balls. When the upper and lower specimens are not parallel due to processing or assembly errors, the frustum-shaped design of the universal joint, the frustum-shaped hole design of the base and the set gap between the two can make the lower specimen adaptively adjusted, so that the lower and upper specimens can be in parallel contact. The steel ball is installed in the center of the frustum-shaped hole to provide a low-friction rotation fulcrum. The torque sensor is installed between the oil holder and the universal joint to measure the torque transmitted between the lower and upper specimens. The transmission mechanism can achieve parallel contact of the specimens and axial load transmission, and the torque sensor can accurately measure the friction torque to provide accurate data for the friction test.

[0018] 2. The transmission mechanism is not only safe in structure and easy to operate, but also adopts a frustum-shaped fit, which has a larger inclusion area compared to the cylindrical fit, thus ensuring the safety of the test process.

[0019] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is a schematic diagram of the appearance of the transmission mechanism provided by the embodiment of the utility model;

[0022] Figure 2 It is a schematic cross-sectional view of a transmission mechanism provided by an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of a universal joint provided by an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of a support base provided by an embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of an oil box provided by an embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of a lower sample provided by an embodiment of the utility model;

[0027] In the figure: 1, driving cylinder; 11, cylinder body; 12, piston rod; 2, base; 3, universal joint; 31, cross groove; 4, connecting sleeve; 41, anti-rotation hole; 5, torque sensor; 6, oil holder; 61, oil box; 611, box body; 612, spline groove; 613, center hole; 62, support seat; 621, boss; 63, lower sample; 7, upper sample; 8, ball seat; 9, steel ball;

[0028] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Due to the existence of processing and assembly errors, parallel contact between samples cannot be guaranteed, and the inaccurate measurement of axial load and torque limits the accurate calculation of ATF friction coefficient, and cannot accurately simulate the dynamic behavior of ATF in actual driving, affecting the accuracy of test results. In order to solve the above technical problems, the utility model proposes a universal axial power transmission mechanism suitable for a low-speed friction tester.

[0031] like Figure 1 , Figure 2 As shown, the universal axial power transmission mechanism includes: a base 2, a universal joint 3 and an oil receiving seat 6; the bottom side of the base 2 is installed on the driving cylinder 1, and a frustum hole is provided on the top side of the base 2, and a steel ball 9 is installed at the center of the frustum hole; the universal joint 3 is installed in the frustum hole, and the outer contour of the universal joint 3 is a frustum shape and there is a set gap between the frustum hole, and the bottom of the universal joint 3 is pressed on the steel ball 9; a lower test sample 63 is provided in the oil receiving seat 6, and an axially fixed upper test sample 7 is provided on the top of the oil receiving seat 6, and a torque sensor 5 is provided between the oil receiving seat 6 and the universal joint 3, and one end of the torque sensor 5 is connected to the oil receiving seat 6, and the other end is connected to the universal joint 3.

[0032] The transmission mechanism transmits the axial load through the universal joint 3, the base 2 and the steel ball 9. When the upper sample 7 and the lower sample 63 are not parallel due to processing or assembly errors, the frustum design of the universal joint 3, the frustum hole design of the base 2 and the set gap between the two can make the lower sample 63 adaptively adjusted, so that the lower sample 63 and the upper sample 7 are in parallel contact, and the steel ball 9 is installed in the center of the frustum hole to provide a low-friction rotation fulcrum. The torque sensor 5 is installed between the oil holder 6 and the universal joint 3 to measure the torque transmitted between the lower sample 63 and the upper sample 7. The transmission mechanism can achieve parallel contact of the samples and axial load transmission, and the friction torque is accurately measured by the torque sensor 5 to provide accurate data for the friction test.

[0033] The transmission mechanism is not only safe in structure and easy to operate, but also adopts a frustum-shaped fit, which has a larger inclusion area compared to a cylindrical fit, thereby ensuring the safety of the test process.

[0034] The driving cylinder 1 is a hydraulic cylinder, including a cylinder body 11 and a piston rod 12. The piston rod 12 is installed in the cylinder body 11, and the base 2 is detachably installed on the exposed end of the piston rod 12. The hydraulic cylinder provides power through the hydraulic system to push the piston rod 12 to move, thereby driving the base 2 and the entire universal axial power transmission mechanism. The design of the hydraulic cylinder can provide a large axial load for the mechanism, and the detachable base 2 design is easy to maintain and replace. The diameter and length design of the piston rod 12 are determined according to the size of the base 2 and the test requirements to ensure smooth operation when pressure is applied.

[0035] like Figure 2 As shown, a bolt through hole is provided on the base 2, and a threaded hole is provided on the end surface of the piston rod 12. The bolt passes through the bolt hole of the base 2 and is installed in the threaded hole of the piston rod 12. The bolt through hole is a countersunk hole.

[0036] The connection between the base 2 and the piston rod 12 is made by bolts and threaded holes, and the base 2 is fixed to the piston rod 12 by bolts to ensure the stability of the base 2 when the hydraulic cylinder is working. The bolt through hole on the base 2 is designed as a countersunk hole, so that the bolt head can be completely sunk into the hole without protruding to affect the use of the test device.

[0037] like Figure 2 As shown, a blind hole is provided at the center of the base 2, a ball seat 8 is installed in the blind hole, an upper ball hole is provided on the top surface of the ball seat 8, a lower ball hole is provided on the bottom side of the universal joint 3, and a steel ball 9 is installed in the upper ball hole and the lower ball hole.

[0038] The ball seat 8 is installed in the blind hole of the base 2 and cooperates with the lower ball hole of the universal joint 3 to form an installation space for the steel ball 9. The steel ball 9 rolls between the upper ball hole of the ball seat 8 and the lower ball hole of the universal joint 3 to achieve multi-directional deflection of the universal joint 3. Moreover, the setting of the ball seat 8 is convenient for replacement after multiple tests without replacing the entire base 2.

[0039] like Figure 1 , Figure 2 As shown, a connecting sleeve 4 is also provided on the top of the universal joint 3, and the torque sensor 5 is arranged between the oil reservoir 6 and the connecting sleeve 4. The connecting sleeve 4 is circumferentially fixed to the universal joint 3, and a stop hole 41 is provided on the outer contour surface of the connecting sleeve 4.

[0040] The connecting sleeve 4 is connected to the oil holder 6 through a torque sensor 5 to measure the torque transmitted to the universal joint 3. A stop hole 41 is provided on the outer periphery of the connecting sleeve 4. A plug rod is provided on the test machine and plugged into the stop hole 41 to prevent the connecting sleeve 4 from rotating and ensure the acquisition of torque data. Of course, it can be understood that the diameter of the stop hole 41 should be larger than the diameter of the plug rod to prevent the adaptive deflection of the universal joint 3 from being hindered.

[0041] like Figure 3 As shown, a cross groove 31 is provided on the top surface of the universal joint 3, and a cross platform is provided on the bottom of the connecting sleeve 4, and the cross platform of the connecting sleeve 4 is inserted into the cross groove 31 of the universal joint 3. The cross groove 31 of the universal joint 3 cooperates with the cross platform of the connecting sleeve 4 to achieve circumferential fixation.

[0042] like Figure 2 As shown, the oil container 6 comprises a detachably connected oil box 61 and a support seat 62, and the lower sample 63 is installed in the oil box 61. Figure 5 As shown, the oil box 61 includes a box body 611, and the center hole 613 of the box body 611 is a threaded hole. Figure 4 As shown, a boss 621 is designed at the center of the support seat 62 , and the threaded hole of the oil box 61 is threadedly installed on the boss 621 of the support seat 62 , and the top surface of the boss 621 is lower than the lower sample 63 .

[0043] The oil container 6 is composed of an oil box 61 and a support seat 62. The oil box 61 and the support seat 62 are connected by threads, and a lower sample 63 is installed in the oil box 61. The detachable design of the oil box 61 and the support seat 62 facilitates the installation of the oil box 61 and the replacement of the lower sample 63.

[0044] The oil box 61 and the support seat 62 are sealed by a sealing ring. Structure and connection relationship: The sealing ring is installed between the oil box 61 and the support seat 62 to ensure that the oil sample does not leak. The sealing ring is made of oil-resistant and high-temperature resistant rubber material and can be used for a long time without aging. The sealing ring is installed between the oil box 61 and the support seat 62, and a good sealing effect is achieved through pre-tightening force to prevent oil from leaking from the connection.

[0045] like Figure 6 As shown, a spline groove 612 is provided in the box body 611, and the outer contour of the lower sample 63 matches the shape of the spline groove 612. The lower sample 63 is connected to the oil box 61 through the spline groove 612 to achieve fixation. The design of the spline groove 612 provides a simple and effective fixing method to ensure the stability of the lower sample 63 during the friction test and prevent the sample from rotating during the test. The size and shape of the spline groove 612 are processed according to the outer contour of the lower sample 63 to ensure that the two can fit closely.

[0046] Based on the universal axial power transmission mechanism, this embodiment also provides a low-speed friction tester, including a hydraulic system, a motor and a transmission mechanism, wherein the hydraulic system provides power to the drive cylinder 1, and the motor drives the upper sample 7 to rotate. The hydraulic system provides pressure oil to the drive cylinder 1 through a hydraulic pump and a control valve, and the motor drives the upper sample 7 to rotate through a transmission device (such as a belt, gear, etc.). This design enables the tester to simulate the friction conditions under actual working conditions, and through the cooperation of the hydraulic system and the motor, accurate control of the friction test is achieved.

[0047] The low-speed friction tester enables the upper sample 7 and the lower sample 63 to contact horizontally, effectively transmit the axial load and perform accurate torque measurement. With this design, the anti-shudder performance of ATF can be evaluated more accurately, thereby improving the driving comfort and overall performance of automatic transmission vehicles, and meeting the market demand for high-performance ATF testing equipment.

[0048] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the protection scope of the utility model.

Claims

1. A universal axial power transmission mechanism, characterized in that: include: Bases, universal joints and oil pans; The bottom side of the base is mounted on the driving cylinder, the top side of the base is provided with a frustum hole, and a steel ball is mounted at the center of the frustum hole; The universal joint is installed in the frustum hole, the outer contour of the universal joint is frustum-shaped and there is a set gap between the universal joint and the frustum hole, and the bottom of the universal joint is pressed on the steel ball; A lower sample is arranged in the oil reservoir, an axially fixed upper sample is arranged on the top of the oil reservoir, a torque sensor is arranged between the oil reservoir and the universal joint, one end of the torque sensor is connected to the oil reservoir, and the other end is connected to the universal joint.

2. The universal axial power transmission mechanism according to claim 1, characterized in that: The driving cylinder is a hydraulic cylinder, which includes a cylinder body and a piston rod. The piston rod is installed in the cylinder body, and the base is detachably installed at the exposed end of the piston rod.

3. The universal axial power transmission mechanism according to claim 2, characterized in that: The base is provided with a bolt through hole, the end surface of the piston rod is provided with a threaded hole, the bolt passes through the bolt hole of the base and is installed in the threaded hole of the piston rod, and the bolt through hole is a countersunk hole.

4. The universal axial power transmission mechanism according to claim 3, characterized in that: A blind hole is arranged at the center of the base, a ball seat is installed in the blind hole, an upper ball hole is arranged on the top surface of the ball seat, a lower ball hole is arranged on the bottom side of the universal joint, and the steel ball is installed in the upper ball hole and the lower ball hole.

5. The universal axial power transmission mechanism according to claim 1, characterized in that: A connecting sleeve is arranged on the top of the universal joint, the torque sensor is arranged between the oil reservoir and the connecting sleeve, the connecting sleeve is circumferentially fixed to the universal joint, and a rotation-stopping hole is arranged on the outer contour surface of the connecting sleeve.

6. The universal axial power transmission mechanism according to claim 5, characterized in that: The top surface of the universal joint is provided with a cross groove, the bottom of the connecting sleeve is provided with a cross platform, and the cross platform of the connecting sleeve is inserted into the cross groove of the universal joint.

7. The universal axial power transmission mechanism according to claim 1, characterized in that: The oil container seat includes a detachably connected oil box and a support seat, the lower sample is installed in the oil box, the oil box includes a box body, the center hole of the box body is a threaded hole, a boss is designed at the center of the support seat, the threaded hole of the oil box is threadedly installed on the boss of the support seat, and the top surface of the boss is lower than the lower sample.

8. The universal axial power transmission mechanism according to claim 7, characterized in that: The oil box and the support seat are sealed by a sealing ring.

9. The universal axial power transmission mechanism according to claim 8, characterized in that: A spline groove is arranged in the box body, and the outer contour of the lower specimen matches the shape of the spline groove.

10. A low speed friction testing machine, characterized in that: It comprises a hydraulic system, a motor and a universal axial power transmission mechanism as described in any one of claims 1 to 9, wherein the hydraulic system provides power for the drive cylinder, and the motor drives the upper sample to rotate.

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