Fatigue test device for welding shaft of auxiliary gearbox of gearbox

Abstract

According to the gearbox auxiliary box welding shaft fatigue test device provided by the utility model, a fatigue testing machine is used for loading, force acts on the gear loading plate through the flexible loading head and is converted into torque acting on a welding gear shaft wheel, the torque transmitted by a gearbox assembly welding shaft is simulated, and the reliability of the device is improved. The gear shaft flange is fixed to the gear shaft fixing frame through a bolt, the welding shaft is prevented from rotating, and acting even moment is formed. The device is simple in structure, convenient to install, high in reliability and capable of independently testing the fatigue strength of the welding joint of the welding shaft, the welding shaft is directly tested, the testing efficiency is high, the device is not influenced by the strength of other transmission parts, the result consistency is good, the research on the fatigue strength of the welding joint of the welding shaft is accelerated, and the testing cost is reduced. The method is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] The utility model belongs to the field of transmission fatigue test, in particular to a transmission auxiliary box welding shaft fatigue test device. Background Art

[0002] As the transmission develops towards high torque, during the fatigue life test of the assembly, the weld of the auxiliary box welded shaft often fails to weld during the torque transmission process. In addition, weld debonding of the auxiliary box welded shaft is also one of the after-sales failures. Therefore, the fatigue strength of the weld becomes a weak point in the fatigue life test of the high torque transmission.

[0003] The existing technology lacks a dedicated test bench for the fatigue strength of welded shaft welds. The strength of welded shaft welds can only be tested as a whole box. However, due to the influence of the strength of the transmission gear or other parts during the test, the gear or other parts are damaged before the weld is detached, making it difficult to assess their fatigue strength. In addition, due to the long transmission fatigue test cycle, high cost, and the influence of other factors of the whole box, the consistency of the test results is relatively poor. Summary of the invention

[0004] The utility model aims to provide a gearbox auxiliary box welded shaft fatigue test device to solve the problems of difficult operation and poor consistency when assessing the fatigue strength of the weld of the welded shaft in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A gearbox auxiliary box welded shaft fatigue test device comprises a welded shaft welded by a gear shaft and a gear, a bottom plate and a gear loading plate arranged on a fatigue testing machine base; a through connecting groove is provided on the gear loading plate, and an internal tooth structure meshing with the gear of the welded shaft is provided in the connecting groove.

[0007] A fixing device is arranged on the bottom plate, and the gear end of the welding shaft enters and extends out of the connecting groove to be connected with the fixing device; the gear shaft end of the welding shaft is fixedly connected with the gear shaft fixing frame; the gear shaft fixing frame is fixedly arranged on the bottom plate.

[0008] One side of the gear loading plate is connected to the flexible loading head of the fatigue testing machine.

[0009] The utility model also has the following features:

[0010] Furthermore, the inner tooth structure of the connecting groove is fully meshed with the gear of the welding shaft.

[0011] Furthermore, the gear shaft end of the welding shaft is fixedly connected to the gear shaft fixing frame via a gear shaft flange.

[0012] Further, the fixing device comprises a reinforcement bracket;

[0013] The side wall of the reinforcement bracket is fixedly connected to the end of the welding shaft gear, and the bottom is fixedly connected to the bottom plate.

[0014] Furthermore, the reinforcement bracket is fixedly connected to the base plate by three M16 bolts;

[0015] The gear shaft fixing frame is fixedly connected to the base plate by three M16 bolts.

[0016] Furthermore, the bottom plate is provided with two T-shaped grooves corresponding to the positions of the gear shaft fixing bracket and the reinforcement bracket;

[0017] The gear shaft fixing frame and the bottom of the reinforcement bracket are both fixedly connected with a plug-in piece matching the T-shaped slot.

[0018] Furthermore, the base plate is fixedly connected to the fatigue testing machine base through four evenly distributed M16 bolts.

[0019] Compared with the prior art, the utility model has the following technical effects:

[0020] The utility model of the gearbox auxiliary box welded shaft fatigue test device uses a fatigue testing machine for loading, and applies force to the gear loading plate through a flexible loading head, which is converted into torque acting on the welded gear shaft wheel, simulating the torque transmitted by the transmission assembly welded shaft, thereby improving the reliability of the device. The gear shaft flange is fixed to the gear shaft fixing frame by bolts to prevent the welded shaft from rotating and forming a force moment; the device has a simple structure, convenient installation, and high reliability, and can perform fatigue strength tests on welded shaft welds alone. Because it directly tests the welded shaft, its test efficiency is relatively high, and it is not affected by the strength of other transmission parts, and the results are consistent. The development of this device accelerates the research on the fatigue strength of welded shaft welds, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the gearbox auxiliary box welding shaft fatigue test device of the utility model;

[0022] Figure 2 It is a schematic diagram of the gear loading plate structure in the utility model.

[0023] The meanings of the numbers in the figure are: 1. welding shaft; 2. bottom plate; 3. gear loading plate; 4. connecting groove; 5. gear shaft fixing bracket; 6. flexible loading head; 7. gear shaft flange; 8. reinforcement bracket; 9. T-slot. DETAILED DESCRIPTION

[0024] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art.

[0025] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of the present application fall within the protection scope of the present invention.

[0026] like Figure 1 As shown, a gearbox auxiliary box welded shaft fatigue test device comprises a welded shaft 1 formed by welding a gear shaft and a gear, a bottom plate 2 arranged on a fatigue testing machine base, and a gear loading plate 3.

[0027] A through connection groove 4 is formed on the gear loading plate 3 , and an internal tooth structure meshing with the gear of the welding shaft 1 is formed in the connection groove 4 .

[0028] A fixing device is provided on the bottom plate 2 , and the end of the gear of the welding shaft 1 enters and extends out of the connecting groove 4 to be connected with the fixing device; the gear shaft end of the welding shaft 1 is fixedly connected with the gear shaft fixing frame 5 ; the gear shaft fixing frame 5 is fixedly provided on the bottom plate 2 .

[0029] One side of the gear loading plate 3 is connected to the flexible loading head 6 of the fatigue testing machine.

[0030] The gearbox auxiliary box welding shaft fatigue test device of the utility model utilizes a fatigue testing machine for loading, and applies force to the gear loading plate 3 through a flexible loading head 6, which is converted into a torque acting on the gear of the welding shaft 1, simulating the torque transmitted by the welding shaft of the transmission assembly, thereby improving the reliability of the device.

[0031] The gear shaft of the welding shaft 1 is fixed on the gear shaft fixing frame to prevent the welding shaft 1 from rotating and forming a torque. This device has a simple structure, is easy to install, and has high reliability. It can perform fatigue strength tests on the welded shaft weld alone. Because it directly tests the welding shaft, its test efficiency is relatively high, is not affected by the strength of other transmission components, and has good result consistency, making it suitable for large-scale use and promotion in industry.

[0032] As a preferred solution, the internal tooth structure of the connecting groove 4 is fully meshed with the gear of the welding shaft 1. This arrangement changes the multi-tooth meshing in the transmission into full-tooth meshing, reduces the stress on a single gear tooth, improves the reliability of the structure, and makes it reusable.

[0033] As a preferred solution, the gear shaft end of the welding shaft 1 is fixedly connected to the gear shaft fixing frame 5 via the gear shaft flange 7 to enhance the connection strength between the two.

[0034] As a specific implementation of the present utility model, Figure 1As shown, a mounting hole matching the gear shaft of the welding shaft 1 is opened on the gear shaft fixing frame 5, the gear shaft of the welding shaft 1 is inserted into the mounting hole, and then the gear shaft end of the welding shaft 1 is fixedly connected to the gear shaft fixing frame 5 through the gear shaft flange 7, thereby further enhancing the connection strength and improving the reliability of the fatigue test.

[0035] Furthermore, the end of the gear of the welding shaft 1 extends out of the connecting groove 4 and is fixedly connected to the reinforcing bracket 8; the reinforcing bracket 8 is fixedly mounted on the bottom plate to enhance the connection strength between the two.

[0036] As a specific implementation of the present invention, the reinforcement bracket 8 can also adopt the above method to open a mounting hole on the side wall of the reinforcement bracket 8 that matches the end of the gear of the welding shaft 1, further increasing the connection strength and achieving a fixed connection between the two.

[0037] Specifically, the reinforcement bracket 8 is fixedly connected to the base plate 2 by three M16 bolts;

[0038] The gear shaft fixing frame 5 is fixedly connected to the base plate 2 by three M16 bolts.

[0039] The base plate 2 is fixedly connected to the fatigue testing machine base through four evenly distributed M16 bolts.

[0040] As a preferred solution, two T-shaped grooves 9 are provided on the bottom plate 2, corresponding to the positions of the gear shaft fixing frame 5 and the reinforcement bracket 8 respectively;

[0041] The bottom of the gear shaft fixing frame 5 and the reinforcement bracket 8 are fixedly connected with a plug-in piece matching the T-shaped slot 9. During installation, the gear shaft fixing frame 5 and the reinforcement bracket 8 are inserted into the corresponding T-shaped slot 9 through their own plug-in pieces, further improving the stability during installation.

Claims

1. A gearbox auxiliary box welding shaft fatigue test device, characterized in that: The invention comprises a welding shaft (1) formed by welding a gear shaft and a gear, a bottom plate (2) arranged on a base of a fatigue testing machine, and a gear loading plate (3); a through connecting groove (4) is provided on the gear loading plate (3), and an internal tooth structure meshing with the gear of the welding shaft (1) is provided in the connecting groove (4); A fixing device is provided on the bottom plate (2); the gear end of the welding shaft (1) enters and extends out of the connecting groove (4) to be connected with the fixing device; the gear shaft end of the welding shaft (1) is fixedly connected with the gear shaft fixing frame (5); the gear shaft fixing frame (5) is fixedly provided on the bottom plate (2); One side of the gear loading plate (3) is connected to a flexible loading head (6) of a fatigue testing machine.

2. The gearbox auxiliary box welded shaft fatigue test device according to claim 1, characterized in that: The internal tooth structure of the connecting groove (4) is fully meshed with the gear of the welding shaft (1).

3. The gearbox auxiliary box welded shaft fatigue test device according to claim 1, characterized in that: The gear shaft end of the welding shaft (1) is fixedly connected to the gear shaft fixing frame (5) via a gear shaft flange (7).

4. The gearbox auxiliary box welded shaft fatigue test device according to claim 1, characterized in that: The fixing device comprises a reinforcing bracket (8); The side wall of the reinforcement bracket (8) is fixedly connected to the end of the gear of the welding shaft (1), and the bottom is fixedly connected to the bottom plate (2).

5. The gearbox auxiliary box welded shaft fatigue test device according to claim 4, characterized in that: The reinforcement bracket (8) and the base plate (2) are fixedly connected by three M16 bolts; The gear shaft fixing frame (5) and the base plate (2) are fixedly connected via three M16 bolts.

6. The gearbox auxiliary box welded shaft fatigue test device according to claim 5, characterized in that: The bottom plate (2) is provided with two T-shaped grooves (9) corresponding to the positions of the gear shaft fixing frame (5) and the reinforcement bracket (8); The bottoms of the gear shaft fixing frame (5) and the reinforcement bracket (8) are both fixedly connected with plug-in components matching the T-shaped slot (9).

7. The gearbox auxiliary box welded shaft fatigue test device according to any one of claims 1 to 6, characterized in that: The base plate (2) is fixedly connected to the fatigue testing machine base via four evenly distributed M16 bolts.

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