Universal shaft testing device

Abstract

The utility model relates to the technical field of cardan shaft testing, in particular to a cardan shaft testing device which comprises an upper pressing plate and a lower supporting plate, the upper pressing plate is located above the lower supporting plate, a second groove is formed in the middle of the lower end of the upper pressing plate, and second containing grooves are formed in the positions, in the middles of the two sides of the bottom of the second groove, of the lower end of the upper pressing plate. A first groove is formed in the middle of the top end of the lower supporting plate, and first containing grooves are formed in the middle of the two sides of the top of the first groove in the top end of the lower supporting plate. And applying pressure to the mandrel and the cardan shaft through external pressure equipment and a device until the molded surface of the cardan shaft is fractured, so that a cardan shaft shear test is completed, and finally cardan shaft performance test verification is completed. The whole test device is simple in structure and convenient to mount, dismount and operate during use, so that the whole test cost is lower, and the test device has higher practicability.

Description

Technical Field

[0001] This utility model relates to a testing device, specifically a universal joint testing device, and belongs to the field of universal joint testing technology. Background Technology

[0002] Before delivery, universal joints require shear testing to verify their performance meets usage requirements. Existing testing equipment cannot directly perform shear tests on universal joints. First, a device is needed to position and fix the universal joint. Then, pressure is applied to the universal joint using the testing equipment and device to complete the shear test. Therefore, a dedicated universal joint testing fixture needs to be developed based on the shear testing equipment requirements and the universal joint's product structure to verify its performance and ensure it meets usage requirements. Utility Model Content

[0003] To address the problems in the existing technology, this utility model provides a universal joint testing device.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A universal joint testing device includes an upper pressure plate and a lower support plate. The upper pressure plate is located above the lower support plate. A second groove is provided in the middle of the lower end of the upper pressure plate. A second placement groove is provided in the middle of both sides of the bottom of the second groove at the lower end of the upper pressure plate. A first groove is provided in the middle of the top end of the lower support plate. A first placement groove is provided in the middle of both sides of the top of the first groove at the top end of the lower support plate.

[0006] Optionally, after the upper pressure plate covers the lower support plate, the second groove, the second placement groove, the first groove, and the first placement groove form a limiting cavity for universal joint testing.

[0007] Optionally, the cross-sections of the first groove and the second groove are both rectangular, and the cross-sections of the first placement groove and the second placement groove are both arc-shaped.

[0008] Optionally, the inner depth of the first groove is greater than the inner depth of the first placement groove, and the inner depth of the second groove is greater than the inner depth of the second placement groove.

[0009] Optionally, both the upper pressure plate and the lower support plate are cubic in shape, and the top cross-section of the upper pressure plate and the bottom cross-section of the lower support plate have the same dimensions.

[0010] The beneficial effects of this utility model are:

[0011] This testing apparatus features a tooling design tailored to the testing requirements of universal joints. Taking into account the universal joint's external structure, it incorporates two cylindrical surfaces at its left and right ends. The universal joint is placed on a lower support plate, which employs a contour-following design to limit and fix the universal joint during testing. A mandrel is then inserted and installed through a through-hole in the center of the universal joint. Simultaneously, an upper pressure plate with two arc-shaped surfaces mates with the outer diameter of the mandrel, ensuring precise installation of the universal joint and the testing apparatus. External pressure equipment and devices apply pressure to the mandrel and universal joint until the universal joint's surface fractures, thus completing the universal joint shear test and ultimately verifying its performance. The entire testing apparatus has a simple structure and is easy to install and disassemble, resulting in low testing costs and strong practicality. Attached Figure Description

[0012] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the universal joint and the installation structure of the device.

[0014] Figure 2 This utility model Figure 1 Side view.

[0015] Figure 3 This is a schematic diagram of the installation structure of the universal joint on the lower support plate of this utility model.

[0016] Figure 4 This is a schematic diagram of the upper pressure plate structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the lower support plate structure of this utility model.

[0018] Figure 6 This is a schematic diagram of the universal joint structure of this utility model.

[0019] Figure 7 This is a schematic diagram of the mandrel structure of this utility model.

[0020] In the diagram: 1. Upper pressure plate; 2. Lower support plate; 3. Mandrel; 4. Universal joint; 5. First groove; 6. Second placement groove; 7. Second groove; 8. First placement groove; 9. Perforation. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Please see Figure 1-7 As shown, a universal joint testing device includes an upper pressure plate 1 and a lower support plate 2. The upper pressure plate 1 is located above the lower support plate 2. A second groove 7 is provided in the middle of the lower end of the upper pressure plate 1. A second placement groove 6 is provided in the middle of both sides of the bottom of the second groove 7 at the lower end of the upper pressure plate 1. A first groove 5 is provided in the middle of the top end of the lower support plate 2. A first placement groove 8 is provided in the middle of both sides of the top of the first groove 5 at the top end of the lower support plate 2.

[0023] After the upper pressure plate 1 is placed on top of the lower support plate 2, the second groove 7, the second placement groove 6, the first groove 5 and the first placement groove 8 form a limiting cavity for testing the universal joint 4.

[0024] The limiting cavity is used for the installation and placement of the universal joint 4 during testing. A through hole 9 is provided through the center of the universal joint 4. During testing, a mandrel 3 of matching diameter is inserted into the through hole 9. Before testing, the universal joint 4 is placed on the upper end of the lower support plate 2. The cylindrical ends of the universal joint 4 are placed inside the two first placement slots 8 above the lower support plate 2. After the mandrel 3 is inserted into the universal joint 4, it is positioned above the interior of the first groove 5, without contacting the first groove 5. The middle part of the universal joint 4 is positioned above the interior of the first groove 5, without contacting the first groove 5. Then, the upper pressure plate 1 is placed on top of the lower support plate 2. The second placement slots 6 on both sides of the lower end of the upper pressure plate 1 are pressed against the two ends of the mandrel 3. The second groove 7 is located above the universal joint 4, and the entire universal joint 4 does not contact the second groove 7.

[0025] Specifically, the first groove 5 and the second groove 7 both have rectangular cross-sections, while the first placement groove 8 and the second placement groove 6 both have arc-shaped cross-sections. The arc-shaped design facilitates fitting with the cylindrical ends of the mandrel 3 and the universal joint 4, ensuring stable placement of the mandrel 3 and the universal joint 4 during testing, preventing wobbling. The mandrel 3 and the universal joint 4 are constrained, resulting in uniform force distribution and more accurate test results. The rectangular design of the first groove 5 and the second groove 7 facilitates the storage of the mandrel 3 and the universal joint 4 during testing, ensuring that both the mandrel 3 and the universal joint 4 only bear force in a preset direction, unaffected by forces in other directions, leading to more accurate test results.

[0026] Specifically, the internal depth of the first groove 5 is greater than the internal depth of the first placement groove 8, and the internal depth of the second groove 7 is greater than the internal depth of the second placement groove 6. This ensures that during testing, the top of the lower support plate 2 only contacts both ends of the universal joint 4, and the bottom of the upper pressure plate 1 only contacts both ends of the spindle 3. This allows all the pressure borne by the upper pressure plate to be transferred to the spindle 3, which in turn can transfer all the pressure to the middle of the universal joint 4, thus testing the performance of the universal joint 4.

[0027] Specifically, both the upper pressure plate 1 and the lower support plate 2 are cubic in shape, and the top cross-section of the upper pressure plate 1 and the bottom cross-section of the lower support plate 2 have the same dimensions. The identical cross-sectional dimensions ensure that during subsequent testing and closing, the positions of the second groove 7 and the second placement groove 6 at the bottom of the upper pressure plate 1 can stably and accurately match the universal joint 4 and the spindle 3.

[0028] In use, the lower support plate 2 is placed on the pre-designed press workbench. Then, the mandrel 3 to be used is inserted into the universal joint 4, and the universal joint 4 to be tested is stably placed on top of the lower support plate 2. Next, the upper pressure plate 1 is placed over the universal joint 4 and the mandrel 3. The press then slowly applies pressure to the upper pressure plate 1. The upper pressure plate 1 applies pressure to the mandrel 3 and then to the universal joint 4 until the surface of the universal joint 4 fractures, thus completing the shear test of the universal joint 4. The magnitude of the pressure applied by the press determines whether the mass of the universal joint 4 meets the pre-designed usage requirements. When the universal joint 4 breaks, the pressure load applied by the press will drop rapidly; the moment of fracture can be determined by observing the change in the pressure load. Furthermore, the upper pressure plate 1 and the lower support plate 2 of this experimental device are relatively lightweight, allowing for easy manual handling. Therefore, the upper pressure plate 1 can be manually removed and installed from the lower support plate 2 during use, eliminating the need to install the upper pressure plate 1 on the press.

[0029] Before applying pressure to the upper pressure plate 1, lower support plate 2, universal joint 4, and spindle 3, the upper pressure plate 1 and lower support plate 2 are kept horizontal, ensuring that the bottom of the upper pressure plate 1 and the top of the lower support plate 2 are parallel. The spindle 3, after insertion and installation, is also horizontal, parallel to the bottom of the upper pressure plate 1 and the top of the lower support plate 2. Furthermore, the spindle 3 maintains a 0.1-0.2mm clearance fit with the through hole 9, making installation and disassembly of the spindle 3 convenient and preventing wobbling. After the universal joint 4 is installed, the inner sides of the first groove 5 maintain a 3-5mm distance from both ends of the middle part of the universal joint 4, and the inner bottom of the first groove 5 maintains a 5-10mm distance from the bottom of the middle part of the universal joint 4. The inner sides of the second groove 7 maintain a 3-5mm distance from both sides of the middle part of the universal joint 4, and the inner top of the second groove 7 maintains a 5-10mm distance from the top of the middle part of the universal joint 4.

[0030] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A universal joint testing device, comprising an upper pressure plate (1) and a lower support plate (2), characterized in that, The upper pressure plate (1) is located above the lower support plate (2). A second groove (7) is provided in the middle of the lower end of the upper pressure plate (1). A second placement groove (6) is provided in the middle of both sides of the bottom of the second groove (7) at the lower end of the upper pressure plate (1). A first groove (5) is provided in the middle of the top end of the lower support plate (2). A first placement groove (8) is provided in the middle of both sides of the top of the first groove (5) at the top end of the lower support plate (2).

2. The universal joint testing device according to claim 1, characterized in that, After the upper pressure plate (1) covers the lower support plate (2), the second groove (7), the second placement groove (6), the first groove (5) and the first placement groove (8) form a limiting cavity for testing the universal joint (4).

3. The universal joint testing device according to claim 2, characterized in that, The first groove (5) and the second groove (7) are both rectangular in cross-section, and the first placement groove (8) and the second placement groove (6) are both arc-shaped in cross-section.

4. The universal joint testing device according to claim 3, characterized in that, The inner depth of the first groove (5) is greater than the inner depth of the first placement groove (8), and the inner depth of the second groove (7) is greater than the inner depth of the second placement groove (6).

5. The universal joint testing device according to claim 1, characterized in that, Both the upper pressure plate (1) and the lower support plate (2) are cubic in shape, and the top cross-section of the upper pressure plate (1) and the bottom cross-section of the lower support plate (2) have the same dimensions.

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