Device for testing looseness of connecting bolt of driven gear of automobile drive axle

Abstract

The utility model relates to an automobile drive axle driven gear connecting bolt looseness testing device, and belongs to the technical field of automobiles. The device comprises a torsion fatigue testing machine, a torsion oil cylinder end is fixedly connected with one end of a first connecting shaft, the other end of the first connecting shaft is fixedly connected with a driven gear connecting disc, and the driven gear connecting disc is connected with a driven gear simulation piece; the detection end of the torque sensor is fixedly connected with one end of a second connecting shaft, the other end of the second connecting shaft is fixedly connected with a differential shell connecting disc, and the differential shell connecting disc is connected with a differential shell simulation piece; the driven gear simulation piece and the differential shell simulation piece are fixedly connected through a driven gear bolt; the outer surfaces of the driven gear connecting disc and the differential shell connecting disc are jointly hermetically connected with a transparent sleeve, so that an accommodating cavity is formed in the inner side of the transparent sleeve; the torsional fatigue testing machine workbench is connected with an oil shell, and a constant-temperature electric heater is arranged in the oil shell. According to the utility model, the working environment of the driven gear connecting bolt can be fully simulated, and the testing accuracy of the connecting bolt is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, in particular to a device for testing loosening of connecting bolts of a driven gear of an automobile drive axle. Background Art

[0002] During vehicle operation, the passive gear of the drive axle must transmit significant torque to ensure proper operation. Currently, the mainstream design uses bolts to mount the passive gear to the differential case, and the reliability of these bolt connections directly impacts vehicle performance. During the drive axle manufacturing and assembly process, ensuring the reliability of the bolts connecting the passive gear of the drive axle is crucial. Therefore, using specialized equipment to test the reliability of the assembly process for these bolts is crucial.

[0003] In the prior art, for example, a test fixture for axle axle bolts on an automobile drive axle, published as CN216483908U, comprises a connecting base and a hexagonal block. One end of the connecting base is connected to the swing cylinder side of a torsional fatigue testing machine, and the other end is connected to the hub axle assembly, on which the axle bolts are mounted, via a hub simulation disk. The axle end of the hub axle assembly is connected to the hexagonal block, which fits within the hexagonal hole of the hexagonal fixing disk. The outer contour of the hexagonal block matches the hexagonal hole of the inner hexagonal fixing disk, forming a clearance fit. The hexagonal fixing disk is connected to the test end of the torsional fatigue testing machine. This fixture, used in conjunction with a torsional fatigue test bench, simulates the stress conditions on the axle axle bolts during actual driving. After testing, the connection performance of the axle bolts is determined by measuring the changes in the tightening torque of the axle bolts.

[0004] However, the test conditions of this fixture differ significantly from those encountered during actual vehicle operation. This is primarily due to the fact that the passive gear connecting bolts operate under conditions of high lubricant content, operating temperatures around 90°C, and subject to alternating torque loads. To verify the effectiveness of the anti-loosening measures for the passive gear connecting bolts, a simple test device that could simulate actual operating conditions was required to verify the reliability of the bolt anti-loosening measures. Utility Model Content

[0005] In order to test the reliability of anti-loosening of the passive gear connecting bolts of the automobile drive axle under actual working conditions, the utility model provides a loosening test device for the passive gear connecting bolts of the automobile drive axle, which can fully simulate the working environment of the passive gear connecting bolts and improve the accuracy of the anti-loosening test of the connecting bolts.

[0006] It adopts the following technical solutions:

[0007] A device for testing loose bolts connecting a driven gear of an automobile drive axle is used on a torsional fatigue testing machine. The torsional fatigue testing machine comprises a torsional oil cylinder end and a torque sensor detection end arranged opposite thereto. The torsional oil cylinder end is fixedly connected to one end of a first connecting shaft. The other end of the first connecting shaft is fixedly connected to a driven gear connecting plate. A driven gear simulation member is connected to the driven gear connecting plate.

[0008] The torque sensor detection end is fixedly connected to one end of the second connecting shaft, and the other end of the second connecting shaft is fixedly connected to the differential housing connection disk, and the differential housing connection disk is connected to the differential housing simulation part;

[0009] The passive gear simulation part and the differential housing simulation part are fixedly connected by passive gear bolts;

[0010] The outer surfaces of the passive gear connecting plate and the differential housing connecting plate are sealed with a transparent sleeve, so that the inner side of the transparent sleeve forms a receiving cavity, and the receiving cavity is filled with gear oil, and the passive gear bolts, the differential housing simulation parts, and the passive gear simulation parts are immersed in the gear oil;

[0011] The workbench of the torsional fatigue testing machine is connected to an oil shell that accommodates a passive gear connecting plate, a passive gear simulation part, a differential shell connecting plate and a differential shell simulation part. Heat-conducting oil is provided in the oil shell, and a constant temperature electric heater that can heat the heat-conducting oil is provided in the oil shell.

[0012] Furthermore, the transparent sleeve is a flexible sleeve, and both ends of the transparent sleeve are sealed and connected to the outer circumferential surfaces of the passive gear connecting disk and the differential housing connecting disk through clamps.

[0013] Furthermore, the transparent cover is a soft glass cover.

[0014] Furthermore, the first connecting shaft is connected to the torsion cylinder end via a flange structure, and the second connecting shaft is connected to the torque sensor detection end via a flange structure.

[0015] Furthermore, an openable and closable oil shell cover is provided on the upper portion of the oil shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This device is equipped with a transparent sleeve, an oil shell and a constant temperature electric heater that can heat the thermal oil. By utilizing the existing torsional fatigue testing machine, it can fully simulate the working environment of the passive gear connecting bolts, especially the lubrication environment and temperature environment of the passive gear connecting bolts, thereby improving the accuracy of the anti-loosening test of the passive gear bolts. At the same time, the device is simple to operate, easy to observe and convenient to use as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is structural schematic view of the automobile drive axle passive gear connecting bolt loosening testing device.

[0019] Mark explanation: 1, first connecting shaft;2, passive gear connecting disc;3, passive gear simulation piece;4, second connecting shaft;5, differential shell connecting disc;6, differential shell simulation piece;7, passive gear bolt;8, transparent sleeve;9, containing cavity;10, oil shell;11, constant temperature electric heater;12, oil shell cover;13, first flange plate;14, second flange plate;100, torsional fatigue testing machine;101, torsional oil cylinder end;102, torque sensor detection end. Specific implementation

[0020] In order to make the utility model more clearly, the utility model is further described below in combination with the drawings, and the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0021] As Figure 1 Indicated, a kind of automobile drive axle passive gear connecting bolt loosening testing device, the device is applied to prior art torsional fatigue testing machine 100 on.Torsional fatigue testing machine 100 has torsional oil cylinder end 101 and the torque sensor detection end 102 being oppositely arranged, and torsional oil cylinder end 101 provides torsional moment for passive gear bolt, and torque sensor detection end 102 is as moment detection end.Torsional oil cylinder end 101 and torque sensor detection end 102 are coaxially arranged columnar structure, and the opposite end of both is free end.Torsional oil cylinder end 101 free end is fixedly connected with the one end of first connecting shaft 1, and the other end of first connecting shaft 1 is fixedly connected with passive gear connecting disc 2, and passive gear connecting disc 2 is connected passive gear simulation piece 3, and first connecting shaft 1, passive gear connecting disc 2 and passive gear simulation piece 3 are all in same axis.

[0022] The free end of the torque sensor detection end 102 is fixedly connected with the one end of second connecting shaft 4, and the other end of second connecting shaft 4 is fixedly connected with differential shell connecting disc 5, and differential shell connecting disc 5 is connected differential shell simulation piece 6;Second connecting shaft 4, differential shell connecting disc 5 and differential shell simulation piece 6 are all in same axis.

[0023] The passive gear simulation part 3 and the differential shell simulation part 6 are fixedly connected by the passive gear bolt 7. The passive gear bolt 7 serves as the test part of the present device. The torque transmitted by the torsion cylinder end 101 and the torque sensor detection end 102 should be transmitted to the passive gear bolt 7 with no loss or low loss. Therefore, correspondingly, for the force transmission components: the connection strength and stiffness of the components between the torsion cylinder end 101 and the passive gear simulation part 3 should be greater than the connection strength and stiffness of the passive gear bolt 7, and the connection strength and stiffness of the components between the torque sensor detection end 102 and the differential shell simulation part 6 should also be greater than the connection strength and stiffness of the passive gear bolt 7. Only in this way can the accuracy of the measurement be guaranteed and the interference of other force transmission components be reduced. The above-mentioned force transmission components can improve the connection strength and stiffness between the components by using one or a combination of fasteners + pins, keys, welding methods. In addition, the above-mentioned parts should use the same material, size and processing technology as the corresponding parts of the drive axle to avoid differences affecting the test accuracy.

[0024] The outer surfaces of the passive gear connecting plate 2 and the differential housing connecting plate 5 are sealed with a transparent sleeve 8, forming a receiving cavity 9 between the inner side of the transparent sleeve 8 and the enclosed components. The receiving cavity 9 is filled with gear oil, and the passive gear bolt 7, differential housing simulation component 6, and passive gear simulation component 3 are immersed in the gear oil. In this way, the lubricated operating environment of the passive gear bolt 7 can be simulated.

[0025] The workbench of the torsional fatigue testing machine is connected to an oil shell 10 that accommodates the passive gear connecting plate 2, the passive gear simulation part 3, the differential housing connecting plate 5 and the differential housing simulation part 6. Heat-conducting oil is provided in the oil shell 10, and a constant temperature electric heater 11 that can heat the heat-conducting oil is provided in the oil shell 10. Here, the oil shell 10 simulates the actual bridge housing, and the heat-conducting oil is heated by the constant temperature electric heater 11 to simulate the oil temperature during actual operation, so that the test environment of the passive gear bolt 7 is closer to the actual use environment; in addition, an openable and closable oil shell cover 12 is also provided on the upper part of the oil shell 10, and the conditions inside the oil shell 10 and the transparent sleeve 8 can be observed through the opening and closing of the oil shell cover 12.

[0026] Preferably, the transparent cover 8 is a flexible cover, such as a soft glass cover. The ends of the transparent cover 8 are respectively clamped to the outer circumferences of the driven gear connecting plate 2 and the differential housing connecting plate 5 by clamps. The deformable soft glass cover forms a seal between the two ends. Of course, when manufacturing the driven gear connecting plate 2 and the differential housing connecting plate 5, the outer diameters of the two should be consistent and have a certain thickness to increase the contact area with the transparent cover.

[0027] In some embodiments, in order to improve the connection strength and positioning accuracy of the first connecting shaft 1 and the torsional cylinder end 101, and the connection strength and positioning accuracy of the second connecting shaft 4 and the torque sensor detection end 102, they are all connected in a flange structure. The end of the first connecting shaft 1 is provided with a first flange plate 13 with a positioning stop, and the first flange plate 13 has uniformly distributed mounting holes and a plurality of positioning pin holes, and the corresponding torsional cylinder end 101 has a positioning protrusion, uniformly distributed threaded holes and a plurality of positioning pin holes, and the two are stably connected through bolts and positioning pins. Similarly, the connection structure of the second connecting shaft 4 and the torque sensor detection end 102 is the same as the above structure: the end of the second connecting shaft 4 is provided with a second flange plate 14 with a positioning stop, and the torque sensor detection end 102 has a positioning protrusion, uniformly distributed threaded holes and a plurality of positioning pin holes, and the two are stably connected through bolts and positioning pins.

[0028] Before the device works, the above-mentioned parts are connected on the torsional fatigue testing machine according to the process requirements, the heat conducting oil is heated to the required temperature; and the alternating torque is generated by the torsional fatigue testing machine to test. During the test, the test torque is generated by the torsional cylinder end 101 of the testing machine, and then the torque is transmitted to the passive gear simulation piece 3 through the first connecting shaft 1, the passive gear simulation piece 3 transmits the torque to the differential housing simulation piece 6 through the passive gear bolt 7, and finally, the torque is transmitted to the torque sensor detection end 102 through the second connecting shaft 4. In this way, the working environment of the passive gear connecting bolt can be fully simulated, and the test accuracy of the connecting bolt is improved.

[0029] The above embodiments of the utility model are merely examples for clearly illustrating the utility model, and are not limitations on the embodiments of the utility model. For ordinary skilled persons in the art, other different forms of changes or variations can be made on the basis of the above description. All the embodiments do not need to be exhausted, and the obvious changes or variations extended from the essential spirit of the utility model still belong to the protection scope of the utility model.

Claims

1. A device for testing loose bolts of a driven gear connecting axle of an automobile, applied to a torsional fatigue testing machine (100), wherein the torsional fatigue testing machine (100) comprises a torsional oil cylinder end (101) and a torque sensor detection end (102) arranged opposite thereto, and characterized in that: The torsion cylinder end (101) is fixedly connected to one end of the first connecting shaft (1), the other end of the first connecting shaft (1) is fixedly connected to a passive gear connecting disk (2), and the passive gear connecting disk (2) is connected to a passive gear simulation component (3); The torque sensor detection end (102) is fixedly connected to one end of the second connecting shaft (4); the other end of the second connecting shaft (4) is fixedly connected to a differential housing connection disk (5); and the differential housing connection disk (5) is connected to a differential housing simulation component (6); The passive gear simulation part (3) and the differential housing simulation part (6) are fixedly connected via a passive gear bolt (7); The outer surfaces of the passive gear connecting plate (2) and the differential housing connecting plate (5) are sealed together with a transparent sleeve (8), so that an accommodating cavity (9) is formed inside the transparent sleeve (8), and gear oil is provided in the accommodating cavity (9), and the passive gear bolt (7), the differential housing simulation part (6), and the passive gear simulation part (3) are immersed in the gear oil; An oil housing (10) accommodating a passive gear connecting disc (2), a passive gear simulation component (3), a differential housing connecting disc (5), and a differential housing simulation component (6) is connected to the workbench of the torsional fatigue testing machine. Heat-conducting oil is provided in the oil housing (10), and a constant-temperature electric heater (11) capable of heating the heat-conducting oil is provided in the oil housing (10).

2. The device for testing loosening bolts of a driven gear connecting axle of an automobile according to claim 1, characterized in that: The transparent sleeve (8) is a flexible sleeve, and both ends of the transparent sleeve (8) are sealed and connected to the outer peripheral surfaces of the driven gear connecting disc (2) and the differential housing connecting disc (5) through clamps.

3. The device for testing loosening bolts of a driven gear connecting axle of an automobile according to claim 2, characterized in that: The transparent cover (8) is a soft glass cover.

4. The device for testing loosening bolts of a driven gear connecting axle of an automobile according to claim 3, characterized in that: The first connecting shaft (1) is connected to the torsion cylinder end (101) via a flange structure, and the second connecting shaft (4) is connected to the torque sensor detection end (102) via a flange structure.

5. The device for testing loosening bolts of a driven gear connecting axle of an automobile according to claim 1, characterized in that: An openable and closable oil shell cover (12) is also provided on the upper portion of the oil shell (10).

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