Vertical bending fatigue test device for hub reduction gearbox

Abstract

The utility model discloses a vertical bending fatigue test device for a hub reduction gearbox. The vertical bending fatigue test device comprises a reduction gearbox mounting table and a loading plate, the reduction gearbox mounting table is used for positioning a single hub reduction gearbox, a positioning structure is arranged on the reduction gearbox mounting table, and the positioning structure is matched with a first part of the hub reduction gearbox; the loading plate is arranged on the top surface of the second part of the hub reduction gearbox and is used for transmitting a vertical loading force applied to the hub reduction gearbox; wherein the first part is located at the torque input end or the torque output end of the hub reduction gearbox, and the second part is located at the torque output end or the torque input end of the hub reduction gearbox. According to the device, the positioning structure matched with the first part of the hub reduction gearbox is arranged on the reduction gearbox mounting table, and the loading force is applied to the second part to realize the fatigue test of the single hub reduction gearbox, so that the influence of the difference of two tested pieces on the effectiveness of the test result is avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more specifically, to a vertical bending fatigue testing device for a wheel-side reduction gearbox. Background Technology

[0002] Wheel-side gearboxes are a new transmission structure adopted by forklifts in recent years. They combine the power transmission function of a gearbox with the vertical load-bearing function of a drive axle. Therefore, wheel-side gearboxes have become a core component of forklifts, replacing traditional drive axle housings for vertical load-bearing and driving.

[0003] like Figure 1 As shown, the conventional drive axle housing structure 10 includes a drive axle housing 11 and brake drums 12 and 15 connected to both ends of the drive axle housing 11. The brake drums 12 and 15 have multiple threaded holes in their circumference, and the wheel rims are fastened and tires are installed by bolts 13. The drive axle housing 11 is the main body for bearing the weight of the entire vehicle, and it is connected to the vehicle frame by frame mounting brackets 14 at both ends of the drive axle housing 11.

[0004] Currently, in the forklift industry, when developing traditional drive axles, the axle housing must undergo 300,000 cycles of vertical bending fatigue testing at twice the rated load, in accordance with "JBT 5928_2014 Test Methods for Drive Axles of Engineering Machinery" and "JBT 5927-1991 Technical Specifications for Tests of Drive Axles of Engineering Machinery". According to the standards, two traditional drive axle housing structures are simultaneously subjected to vertical bending fatigue testing. The two drive axle housings are connected at both ends to the same loading fixture above them via frame mounting brackets. Then, specialized testing equipment is used to repeatedly apply downward loading forces to the loading fixture, thereby transferring the loading force to the two traditional drive axle housing structures, achieving the purpose of the vertical bending fatigue test.

[0005] Currently, there are no industry standards for testing methods and judgments regarding forklift wheel-end reduction gearboxes. Furthermore, due to significant differences in structure between wheel-end reduction gearboxes and traditional drive axle housings, it is impossible to conduct vertical compression-bending fatigue tests on wheel-end reduction gearboxes using the same methods as for traditional drive axle housings. Additionally, in the vertical compression-bending fatigue tests of traditional drive axle housings, there are always some differences between the two housings, making it impossible to accurately assess the validity of the test results when tested simultaneously. Utility Model Content

[0006] This application provides a vertical bending fatigue testing device for a wheel-side gearbox. A positioning structure matching the first part of the wheel-side gearbox is set on the gearbox mounting platform, and a loading force is applied to the second part to realize the fatigue test of a single wheel-side gearbox, thus avoiding the influence of the difference between the two test pieces on the validity of the test results.

[0007] This application provides a vertical bending fatigue testing device for a wheel-side gearbox, including a gearbox mounting platform and a loading plate;

[0008] The gearbox mounting platform is used to position a single wheel-side gearbox. The gearbox mounting platform is equipped with a positioning structure that matches the first part of the wheel-side gearbox.

[0009] The loading plate is set on the top surface of the second part of the wheel-side reduction gearbox and is used to transmit the vertical loading force applied to the wheel-side reduction gearbox.

[0010] The first part is located at the torque input end or torque output end of the wheel-side reduction gearbox, and the second part is located at the torque output end or torque input end of the wheel-side reduction gearbox.

[0011] Preferably, the gearbox mounting platform includes a base plate and a first protrusion fixed to the base plate, the first protrusion having a first through hole;

[0012] The torque input end of the wheel-side reduction gearbox is provided with a frame connecting flange. The wheel-side reduction gearbox is installed in the first through hole. The frame connecting flange is connected to the side wall around the first through hole on the first protrusion by bolts.

[0013] Preferably, the torque output end of the wheel-side reduction gearbox is provided with a rim connecting flange, and the loading plate is in contact with the outer circumferential surface of the upper end of the rim connecting flange.

[0014] Preferably, the gearbox mounting platform includes a base plate and a second protrusion fixed to the base plate, the second protrusion having a second through hole;

[0015] The torque output end of the wheel-side reduction gearbox is provided with a rim connecting flange. The wheel-side reduction gearbox is installed in the second through hole. The rim connecting flange is connected to the side wall around the second through hole on the second protrusion by bolts.

[0016] Preferably, the torque input end of the wheel-side reduction gearbox is provided with a frame connecting flange, and the loading plate is in contact with the outer circumferential surface of the upper end of the frame connecting flange.

[0017] Preferably, sliders are provided on both sides of the loading plate;

[0018] Limiting brackets are provided on both sides of the loading plate, and guide rails are provided on the limiting brackets. The slider of the loading plate is slidably set in the corresponding guide rail.

[0019] Preferably, a connecting block is provided on the top surface of the loading plate.

[0020] Preferably, the top surface of the connecting block is provided with a positioning groove whose shape matches the end of the telescopic rod of the hydraulic cylinder.

[0021] Preferably, the vertical bending fatigue testing device for the wheel-side gearbox further includes a load-bearing support disposed below the base plate, with the base plate fixed to the top surface of the load-bearing support.

[0022] Preferably, the vertical bending fatigue testing device for the wheel-side gearbox further includes a mounting plate, and the load-bearing support is fixed on the top surface of the mounting plate.

[0023] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0025] Figure 1 This is a schematic diagram of a traditional drive axle housing structure;

[0026] Figure 2 This is a schematic diagram of the wheel-side reduction gearbox structure;

[0027] Figure 3 A structural diagram of the vertical bending fatigue testing device for the wheel-side gearbox provided in this application;

[0028] Figure 4 This is an installation diagram of the wheel-side reduction gearbox and the reduction gearbox mounting platform provided in this application. Detailed Implementation

[0029] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] This application provides a vertical bending fatigue testing device for a wheel-end reduction gearbox. A positioning structure matching the first part of the wheel-end reduction gearbox is set on the gearbox mounting platform, and a loading force is applied at the second part to achieve fatigue testing on a single wheel-end reduction gearbox, avoiding the influence of differences between the two test pieces on the validity of the test results. Furthermore, the positioning structure simulates the connection between the vehicle frame or wheel rim and the wheel-end reduction gearbox, avoiding the influence of strength differences between the test fixture and the vehicle frame or wheel rim on the test results.

[0034] like Figure 2 As shown, the vehicle is symmetrically equipped with two separate wheel-side reduction gearbox structures 20. Each wheel-side reduction gearbox structure 20 includes a wheel-side reduction gearbox 23 and a drive motor 21. The drive motor 21's bracket is connected to the wheel-side reduction gearbox 23. The drive motor 21 provides the driving power, while the wheel-side reduction gearbox 23 reduces speed and increases torque. The torque input end of the wheel-side reduction gearbox 23 (the end closer to the drive motor 21) has a frame connecting flange 25, and the torque output end of the wheel-side reduction gearbox 23 (the end farther from the drive motor 21) has a rim connecting flange 26. The end face of the rim connecting flange 26 has multiple threaded holes, which are used to fasten the rim and install the tire during vehicle assembly using bolts 24. The end face of the frame connecting flange 25 also has multiple threaded holes, which are used to connect to the frame during vehicle assembly using bolts 22.

[0035] As an example, the vertical bending fatigue testing device for wheel-side gearboxes provided in this application includes a gearbox mounting platform and a loading plate.

[0036] The gearbox mounting platform is used to position a single wheel-side gearbox 20. The mounting platform has a positioning structure that matches the first part of the wheel-side gearbox 20. A loading plate is positioned on the top surface of the second part of the wheel-side gearbox 20 to transmit the vertical loading force applied to the wheel-side gearbox 20.

[0037] Based on the structure of the wheel-end reduction gearbox, the first part is located at the torque input end or torque output end of the wheel-end reduction gearbox, and the second part is located at the torque output end or torque input end of the wheel-end reduction gearbox. Specifically, the location where the vertical load force is applied (i.e., the second part) can be the mounting surface of the wheel-end reduction gearbox to the vehicle frame or the mounting surface of the wheel-end reduction gearbox to the wheel rim.

[0038] As one example, the vertical loading force is applied at the mounting surface of the wheel-side reduction gearbox and the wheel rim. Specifically, as... Figure 3 and 4As shown, the gearbox mounting platform includes a base plate 3 and a first protrusion 7 (as a positioning structure) fixed on the base plate 3. The first protrusion 7 has a first through hole, and the wheel-side gearbox 20 is inserted into the first through hole. The frame connecting flange 25 (i.e., the first part) is connected to the side wall around the first through hole on the first protrusion 7 by bolts 22, simulating the connection between the frame and the wheel-side gearbox, avoiding the influence of the strength difference between the test fixture and the frame on the test results, and providing sufficient strength support for the wheel-side gearbox. In this embodiment, the loading plate 5 is attached to the outer circumferential surface (i.e., the second part) of the upper end of the wheel rim connecting flange 26, and the two are connected by bolts 24.

[0039] In this embodiment, the frame connecting flange 25 is used to position the wheel-side reduction gearbox 20 on the vertical bending fatigue test device. A vertical loading force F is applied to the loading plate 5, so that the vertical loading force is transmitted to the wheel rim connecting flange 26, so that the wheel rim connecting flange 26 is subjected to force, thereby realizing the fatigue test.

[0040] In another embodiment, the vertical loading force is applied at the mounting surface of the wheel-side reduction gearbox and the vehicle frame. Specifically, the gearbox mounting platform includes a base plate and a second protrusion (as a positioning structure) fixed to the base plate. The second protrusion has a second through hole, and the wheel-side reduction gearbox 20 is inserted into the second through hole. The rim connecting flange 26 (i.e., the first part) is connected to the side wall around the second through hole on the second protrusion by bolts, simulating the connection between the rim and the wheel-side reduction gearbox. This avoids the influence of the strength difference between the test fixture and the rim on the test results, while providing sufficient strength support for the wheel-side reduction gearbox. In this embodiment, the loading plate is fitted to the outer circumferential surface (i.e., the second part) at the upper end of the vehicle frame connecting flange 25, and the two are connected by bolts.

[0041] In this embodiment, the rim connecting flange 26 is used to position the wheel-side reduction gearbox 20 on the vertical bending fatigue test device. A vertical loading force F is applied to the loading plate 5, so that the vertical loading force is transmitted to the frame connecting flange 25, so that the frame connecting flange 25 is subjected to force, thereby realizing the fatigue test.

[0042] Based on the above, preferably, such as Figure 3 As shown, sliders are provided on both sides of the loading plate 5. Limiting brackets 4 are provided on both sides of the loading plate 5. Multiple threaded holes 32 for mounting the limiting brackets 4 are provided on the base plate 3, and the limiting brackets 4 are fixed to the base plate 3 with screws. Guide rails are provided on the limiting brackets 4, and the sliders of the loading plate 5 are slidably positioned within the corresponding guide rails. This serves to guide and limit the up-and-down movement of the loading plate 5 during the test, while preventing the loading plate 5 from rotating and ensuring the verticality of the vertical loading force F.

[0043] Preferably, a connecting block 6 is provided on the top surface of the loading plate 5, which is used to uniformly increase the vertical loading force F onto the loading plate 5 and transmit it to the wheel-side reduction gearbox 20.

[0044] Preferably, such as Figure 3 As shown, the top surface of the connecting block 6 is provided with a positioning groove 61 whose shape matches the end of the telescopic rod of the oil cylinder, so as to ensure the accuracy of the loading position of the oil cylinder during the test loading.

[0045] As an example, based on the above, such as Figure 3 As shown, the vertical bending fatigue testing device also includes a load-bearing support 2 located below the base plate 3, with the base plate 3 fixed to the top surface of the load-bearing support 2. Specifically, the base plate 3 has multiple through holes 31, and bolts are used to fix the base plate 3 to the load-bearing support 2.

[0046] Based on the above, such as Figure 3 As shown, the vertical bending fatigue testing device also includes a mounting plate 1, a load-bearing support 2 fixed on the top surface of the mounting plate 1, and the mounting plate 1 fixed on the ground or a ground trench iron, thus playing the role of overall fixation.

[0047] As an example, when conducting a vertical bending fatigue test on a wheel-side gearbox using the aforementioned vertical bending fatigue testing device, the vertical loading force is an integer multiple of the rated load (e.g., 2 times), and the number of loading cycles is not less than a preset number (e.g., 300,000 cycles).

[0048] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A vertical bending fatigue testing device for a wheel-side gearbox, characterized in that, Includes the gearbox mounting platform and loading plate; The gearbox mounting platform is used to position a single wheel-side gearbox. The gearbox mounting platform is provided with a positioning structure, which matches the first part of the wheel-side gearbox. The loading plate is disposed on the top surface of the second part of the wheel-side reduction gearbox and is used to transmit the vertical loading force applied to the wheel-side reduction gearbox. The first part is located at the torque input end or torque output end of the wheel-side reduction gearbox, and the second part is located at the torque output end or torque input end of the wheel-side reduction gearbox.

2. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 1, characterized in that, The gearbox mounting platform includes a base plate and a first protrusion fixed on the base plate, wherein the first protrusion is provided with a first through hole; The torque input end of the wheel-side reduction gearbox is provided with a frame connecting flange. The wheel-side reduction gearbox is installed in the first through hole. The frame connecting flange is connected to the side wall around the first through hole on the first protrusion by bolts.

3. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 2, characterized in that, The torque output end of the wheel-side reduction gearbox is provided with a rim connecting flange, and the loading plate is in contact with the outer circumferential surface of the upper end of the rim connecting flange.

4. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 1, characterized in that, The gearbox mounting platform includes a base plate and a second protrusion fixed on the base plate, the second protrusion having a second through hole; The torque output end of the wheel-side reduction gearbox is provided with a rim connecting flange. The wheel-side reduction gearbox is installed in the second through hole. The rim connecting flange is connected to the side wall around the second through hole on the second protrusion by bolts.

5. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 4, characterized in that, The torque input end of the wheel-side reduction gearbox is provided with a frame connecting flange, and the loading plate is in contact with the outer circumferential surface of the upper end of the frame connecting flange.

6. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 1, characterized in that, The loading plate is provided with sliders on both sides; Limiting brackets are provided on both sides of the loading plate, and guide rails are provided on the limiting brackets. The slider of the loading plate is slidably disposed in the corresponding guide rail.

7. The vertical bending fatigue testing device for wheel-side reduction gearboxes according to claim 1, characterized in that, A connecting block is provided on the top surface of the loading plate.

8. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 7, characterized in that, The top surface of the connecting block is provided with a positioning groove whose shape matches the end of the telescopic rod of the oil cylinder.

9. The vertical bending fatigue testing device for a wheel-side reduction gearbox according to claim 2 or 4, characterized in that, It also includes a load-bearing support disposed below the base plate, the base plate being fixed to the top surface of the load-bearing support.

10. The vertical bending fatigue testing device for the wheel-side reduction gearbox according to claim 9, characterized in that, It also includes a mounting plate, and the load-bearing support is fixed to the top surface of the mounting plate.

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