Gear contact fatigue oil testing machine

Abstract

The invention provides a gear contact fatigue oil testing machine, which adopts an electric closed energy feedback mode, and comprises a test base, and a driving motor, a loading motor and a gear box which are arranged on the test base, wherein the driving motor and the loading motor are located on the same side of the test base, the output shaft end of the driving motor is connected with the high-speed shaft input end of the gearbox, and the low-speed shaft output end of the gearbox is connected with the input end of the loading motor. The gear contact fatigue oil testing machine is simple in overall structure, the operation complexity is greatly reduced, the control precision of an electric closed form is remarkably improved, the testing performance is improved, energy consumption is low, and energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of oil testing machines, and in particular relates to a gear contact fatigue oil testing machine. Background Art

[0002] Oil testing machines are essential tools for evaluating lubricant performance. They simulate actual operating conditions to test oil performance under varying conditions. With industrial development, the demand for lubricant performance is increasing, especially in applications requiring high speed, high power, and low noise. Oil testing machines can verify the rationality of gear transmission design and the processability of machining, manufacturing, assembly, and commissioning. In-depth analysis of test results helps understand and assess the overall mechanical performance of gear transmissions. However, the operation of these testing machines typically involves significant energy consumption, leading to a continued focus on their efficient energy utilization.

[0003] Current oil testing machines have some significant shortcomings and deficiencies. For example, the national standard FZG test method for evaluating gear lubricant performance uses mechanically enclosed energy feedback. Mechanically enclosed systems typically consist of multiple mechanical components, making the overall system structure more complex, increasing the difficulty of maintenance and commissioning, and requiring more manual intervention and adjustments. This not only reduces work efficiency but also increases operational complexity. Furthermore, mechanically enclosed torque control is often less precise than electrically enclosed systems. Because multiple mechanical transmission links are involved, torque may be lost during transmission, resulting in reduced control accuracy, limited test performance, poor energy savings, and high energy consumption, which is detrimental to energy conservation and environmental protection.

[0004] In addition, existing oil testing machines often have the drive and loading ends designed on either side of the tester. This layout requires the operator to move back and forth between the two sides of the tester for operation and monitoring, which increases operational complexity and may lead to operational errors. At the same time, due to the separation of the drive and loading ends, the operator needs to spend more time moving between different positions during operation, reducing work efficiency. Summary of the Invention

[0005] In view of this, the present application aims to propose a gear contact fatigue oil testing machine to solve at least one of the above problems.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: The present application provides a gear contact fatigue oil testing machine, which adopts an electrically closed energy feedback method and includes a test base, and a drive motor, a loading motor and a gear box arranged on the test base; The driving motor and the loading motor are located on the same side of the test base, and the output shaft end of the driving motor is connected to the high-speed shaft input end of the gear box, and the low-speed shaft output end of the gear box is connected to the loading motor input end.

[0007] Furthermore, a plurality of T-slots are arranged at intervals on the upper end surface of the test base, and the driving motor and the loading motor are installed in the T-slots through fasteners; The bottom of the test base is also provided with multiple groups of shock absorbing components.

[0008] Furthermore, the output shaft end of the driving motor is connected to the first torque sensor and the coupling in sequence, and is fixedly connected to the input high-speed shaft of the gearbox through a flange. The first torsion sensor is supported by a first fixed bracket and is arranged on the test base.

[0009] Furthermore, the low-speed shaft at the output end of the gearbox is sequentially connected to the second torque sensor and the locked-rotor structure, and is also connected to the input end of the loading motor; The second torque sensor and the stall structure are supported by a second fixing bracket and are arranged on the test base.

[0010] Furthermore, protective covers are installed on the outer sides of the second torque sensor and the locked-rotor structure.

[0011] Furthermore, the gearbox includes a housing, an end cover, a high-speed gear shaft system and a low-speed gear shaft system, the bottom end of the housing is fixedly connected to the test base through a provided base, and further includes: Positioning members, the number of which is at least two, including a positioning pin and a positioning plug, the positioning pin being provided on the housing, the positioning plug being provided on the end cover, the positioning pin being correspondingly plugged into the positioning plug; The bracket assembly is a multi-hinge structure, one end of which is arranged at the top of the shell and the other end is fixedly connected to the end cover.

[0012] Furthermore, a stepped hole is provided through the housing, the positioning pin is correspondingly arranged in the stepped hole, a gasket is provided on the side away from the end cover, and the positioning pin is fixedly connected to the gasket by a screw; The end of the positioning pin is arranged in a tapered structure.

[0013] Furthermore, the end cover is provided with a through hole corresponding to the stepped hole, and an embedded part is provided at the through hole, the positioning plug includes a cover, the cover is a semi-enclosed structural part with an opening on one side and a built-in accommodating cavity, the cover is fixedly connected to the embedded part, a spring is installed in the cover, the spring is limited to the accommodating cavity by the plug, and the positioning pin extends into the cover to compress the plug and the spring; A limiting structure for limiting the movement of the plug is also provided in the sealing cover.

[0014] Furthermore, an annular groove is formed on the inner wall of the sealing cover, and an elastic retaining ring is correspondingly installed in the annular groove.

[0015] Furthermore, the bracket assembly includes a first connecting arm, a second connecting arm and a third connecting arm that are hinged to each other, wherein one end of the first connecting arm is set at the top of the shell through a rotating shaft, the first connecting arm rotates around the rotating shaft, and the third connecting arm is fixedly connected to the outer wall of the end cover by a screw.

[0016] Compared with the prior art, the gear contact fatigue oil testing machine described in this application has the following beneficial effects: (1) This application adopts an electric closed energy feedback method with higher control accuracy. Compared with the traditional mechanical closed test method, the entire test machine system has the advantages of simpler structure, reduced difficulty in debugging and maintenance, easy operation, and less energy consumption, which is beneficial to energy saving and environmental protection.

[0017] (2) This application uses the driving motor and the loading motor on the same side of the test base, which greatly reduces the complexity of the operator's operation, avoids repeated movement on both sides of the test base for operation, and effectively improves work efficiency.

[0018] (3) This application can effectively solve the problem of wear of bearings and other components caused by eccentricity by installing a positioning member and a bracket assembly on the gearbox, and it saves time and effort to disassemble the gearbox, thereby ensuring the sustainability and economy of the oil test base. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of a gear contact fatigue oil testing machine according to an embodiment of the present application; Figure 2 This is a structural schematic diagram of a gear contact fatigue oil testing machine without a protective cover according to an embodiment of the present application; Figure 3This is a schematic structural diagram from a first angle of a gear disassembly device for a high-speed gearbox for oil product testing according to an embodiment of the present application; Figure 4 This is a schematic structural diagram from a second angle of a gear disassembly device for a high-speed gearbox for oil product testing according to an embodiment of the present application; Figure 5 This is a cross-sectional view of the low-speed gear shaft system and the high-speed gear shaft system according to an embodiment of the present application; Figure 6 This is a cross-sectional view of the positioning member described in an embodiment of the present application; Figure 7 This is a schematic diagram of the bracket assembly structure described in an embodiment of the present application.

[0020] Description of reference numerals: 1-test base; 2-drive motor; 3-coupling; 4-first torque sensor; 5-flange; 6-blocking structure; 7-loading motor; 8-gearbox; 81-housing; 82-end cover; 83-low-speed gear shaft system; 84-high-speed gear shaft system; 85-base; 9-second torque sensor; 10-protective cover; 12-air spring; 13-cast iron platform; 14-positioning member; 141-positioning pin; 142-gasket; 143-sealing cover; 144-insert; 145-spring; 146-plug; 147-elastic retaining ring; 15-bracket assembly; 151-first connecting arm; 152-second connecting arm; 153-third connecting arm; 154-rotating axis. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example 1 As described in the background technology above, the energy feedback form adopted by the FZG experimental method in the prior art is mechanical closure, which makes the entire system structure more complicated, increases the difficulty of debugging and maintenance, and has high operational complexity. In addition, the use of mechanical closure will cause torque loss during the transmission process, reduce control accuracy, limit test performance, and have poor energy-saving effects. The high energy consumption is not conducive to energy saving and environmental protection.

[0024] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0025] See also Figure 1 and Figure 2 As shown, this embodiment provides a gear contact fatigue oil testing machine, which adopts an electric closed energy feedback method and includes a test base 1, a drive motor 2, a loading motor 7 and a gear box 8 arranged on the test base 1; Among them, the driving motor 2 and the loading motor 7 are located on the same side of the test base 1, and the output shaft end of the driving motor 2 is connected to the high-speed shaft input end of the gear box 8, and the low-speed shaft output end of the gear box 8 is connected to the input end of the loading motor 7.

[0026] Specifically, in this embodiment, the driving motor 2 drives the high-speed transmission shaft at high speed to drive the input gear to rotate, and the input gear drives the output gear to rotate and transmits it to the low-speed transmission shaft and outputs it to the loading motor 7. The entire transmission process completes a closed loop.

[0027] This oil testing machine uses an electrically enclosed energy feedback method, effectively solving the above-mentioned problems. The overall structure of the testing machine is simple, and the complexity of operation is greatly reduced. The control accuracy of the electrically enclosed form is significantly improved, the test performance is improved, and energy consumption is reduced, which is energy-saving and environmentally friendly. In addition, the present application adopts the arrangement of driving and loading on the same side of the test base 1, which is simple for operators to operate during the test, avoids repeated movement on both sides of the test base 1, and greatly improves work efficiency.

[0028] In some embodiments, a plurality of T-slots are spaced apart on the upper end surface of the test base 1, and the drive motor 2 and the loading motor 7 are mounted in the T-slots via fasteners; The bottom of the test base 1 is also provided with multiple groups of shock-absorbing components.

[0029] Specifically, in this embodiment, the test base 1 is integrated with the concrete foundation through secondary grouting, and is used to install the main structure of the test machine, such as the drive motor 2, gearbox 8, and loading motor 7. The test base 1 is provided with T-slots specifically for installation, facilitating installation and removal, as well as the movement of various components. It has the characteristics of high adaptability, strong versatility, and high practicality. In addition, the present application installs an air spring 145 at the bottom of the test base 1, which acts as a vibration damper during the high-speed rotation of the test base 1.

[0030] In some embodiments, the output shaft end of the drive motor 2 is connected to the first torque sensor 4 and the coupling 3 in sequence, and is fixedly connected to the input high-speed shaft of the gearbox 8 through the flange 5. The first torsion sensor is supported by a first fixed bracket and is disposed on the test base 1; The low-speed shaft at the output end of the gearbox 8 is connected in sequence to the second torque sensor 9 and the stall structure 6, and is also connected to the input end of the loading motor 7; The second torque sensor 9 and the locked-rotor structure 6 are supported by a second fixing bracket and are arranged on the test base 1; A protective cover 10 is further installed on the outside of the second torque sensor 9 and the stall structure 6 .

[0031] Specifically, in this embodiment, a cast iron platform 13 is provided under the driving motor 2, and the two are connected as a whole and fixed on the test base 1. The output shaft end of the driving motor 2 is connected to the torque sensor, the coupling 3, the flange 5 in sequence, and is connected to the high-speed shaft input end of the gear box 8; the low-speed shaft output end of the gear box 8 is connected to the torque sensor, the locking structure 6 in sequence, and is connected to the input end of the loading motor 7; and a protective cover 10 is provided above the locking structure 6 at the input end of the loading motor 7 and the torque sensor to prevent parts from flying away. The torque sensors used at the input end of the loading motor 7 and the output end of the driving motor 2 are supported by cast iron brackets respectively, and the torque sensor and the cast iron brackets are connected to each other.

[0032] Example 2 Within the oil testing platform 1, gearbox 8 testing primarily focuses on the effects of lubricant on gears and the evaluation of lubricant performance. The viscosity, density, and oil volume of the lubricant directly impact the gearbox 8's churning loss, frictional power loss, and cooling effectiveness. Churning loss is a significant component of the gearbox's total power loss, accounting for approximately 30%. Therefore, researching and optimizing the gearbox 8's lubrication system and reducing churning loss are crucial for improving gearbox 8 efficiency and reducing energy consumption.

[0033] At present, the high-speed gearbox 8 used for oil product testing has the defect of being inconvenient to open the box and remove the gears. This is because the design of the gearbox 8 may not take into account the frequent disassembly needs, resulting in a complicated and time-consuming disassembly process. This design deficiency increases the difficulty of maintenance and inspection, especially when it is necessary to quickly replace gears or perform troubleshooting. In addition, there is also the problem of the housing and the gear shaft being out of center after the gears are removed. This out of center problem may be caused by manufacturing tolerances, wear of the gearbox 8, or assembly errors of the housing structure during the disassembly process. The out of center problem will cause the gearbox 8 to operate unstably, increase vibration and noise, cause bearing wear, and reduce the service life and efficiency of the gearbox 8. Therefore, in order to ensure that the housing and the gear shaft are concentric, it is necessary to solve the problem of fixing the housing after it is removed. The housing 81 of the gearbox 8 usually needs to be precisely fixed to ensure its stability during operation and the accuracy of the position coordinates.

[0034] However, existing fixtures cannot accommodate all types of gearbox 8 housings 81, or may damage the housing 81 during the fixing process, especially when the housing 81 has thin walls, or may cause the housing to shift in position. This not only affects the sealing of the gearbox 8, but can also cause lubricant leakage, further affecting the accuracy of oil testing and the performance of the gearbox 8. Due to these issues, frequent gear removal and replacement, resulting in misalignment and wear and damage to the gearbox 8, incurs additional costs, which is detrimental to the continuity and economic efficiency of oil testing.

[0035] To this end, the present application designs a device specifically for disassembling the gears in order to solve the problem that the gear box 8 is not convenient to open and disassemble the gears. Figure 3 and Figure 4 As shown, the details are as follows: The gearbox 8 includes a housing 81, an end cover 82, a high-speed gear shaft system 84, and a low-speed gear shaft system 83. The bottom end of the housing 81 is fixedly connected to the test base 1 through a base 85. The gearbox also includes: There are at least two positioning members 14, including a positioning pin 141 and a positioning plug. The positioning pin 141 is provided on the housing 81, and the positioning plug is provided on the end cover 82. The positioning pin 141 is correspondingly inserted into the positioning plug; The bracket assembly 15 is a multi-hinge structure, one end of which is arranged at the top of the shell 81 and the other end is fixedly connected to the end cover 82.

[0036] Specifically, in this embodiment, the positioning pins 141 are arranged at the upper left and upper right of the shell 81 for positioning between the shell 81 and the end cover 82. The bracket assembly 15 is located at the upper right of the shell 81, one end of which is connected to the shell 81, and the other end is connected to the detachable end cover 82 of the shell 81. The bracket assembly 15 is a multi-hinge structure. The whole is formed by three connecting arms and connected by three rotating shafts 154. Each rotating shaft 154 can rotate 360 degrees, has a high degree of rotational freedom, and can achieve multi-directional movement.

[0037] The gear disassembly device of a high-speed gearbox 8 for oil quality testing described in this embodiment is provided with a bracket assembly 15 on the housing 81, so that the housing can be accurately fixed when the gear is disassembled when it is opened, and when the end cover 82 is reinstalled, the positioning pin 141 is used to ensure that the entire housing of the gearbox 8 remains concentric with the gear shaft, thereby avoiding wear of the bearings, housing and other components of the gearbox 8, thereby ensuring the continuity and economy of the oil quality test.

[0038] In addition, in this embodiment, Figure 5 As shown, the low-speed gear shaft system 83 is specifically composed of: the low-speed shaft is provided with a locking nut, a four-point contact bearing, a spacer sleeve, a distance sleeve, a cylindrical bearing, a lip seal, a low-speed shaft sealing seat, an input gear, a locking nut, a cylindrical bearing, a low-speed shaft end cover 82, and a low-speed shaft sealing cover 143 from the output end; the high-speed gear shaft system 84 is specifically composed of: the high-speed shaft is provided with a flange 5, a locking nut, a high-speed shaft sealing ring, an angular contact bearing, a spacer sleeve, a distance sleeve, an angular contact bearing (two angular contact bearings are installed back to back), a high-speed shaft sealing seat, a high-speed shaft, a spacer sleeve, a locking nut, a cylindrical bearing, a locking nut, and a high-speed shaft sealing cover 143 from the input end; in addition, the oil pipe and the lubricating oil pipe are embedded in the gear box 8.

[0039] The working principle is: connect the drive motor 2 from one side of the input shaft of the gear box 8 to drive the high-speed shaft and the input gear to rotate, thereby driving the output gear and the low-speed shaft, and connect the loading motor 7 from the output end of the low-speed shaft. During the rotation of the gear, the lubrication nozzle sprays lubricating oil onto the two gears for testing.

[0040] It should be noted that the low-speed gear shaft system 83 and the high-speed gear shaft system 84 used in this embodiment are both common gear system structures in the field. This application does not improve them, and the structural composition of each gear system will not be described in detail here.

[0041] In some embodiments, a stepped hole is formed through the housing 81, and a positioning pin 141 is correspondingly disposed in the stepped hole. A gasket 142 is disposed on a side away from the end cover 82, and the positioning pin 141 and the gasket 142 are fixedly connected by screws. The end of the positioning pin 141 is provided with a tapered structure. The end cap 82 is provided with a through hole corresponding to the stepped hole, and an insert 144 is provided at the through hole. The positioning plug includes a cover 143, which is a semi-enclosed structural member with an opening on one side and a built-in accommodating cavity. The cover 143 is fixedly connected to the insert 144. A spring 145 is installed in the cover 143, and the spring 145 is limited to the accommodating cavity by a plug 146. The positioning pin 141 extends into the cover 143 to compress the plug 56 and the spring 55. An annular groove is formed on the inner wall of the sealing cover 143 , and an elastic retaining ring 147 is installed in the annular groove. The elastic retaining ring 147 is used to limit the movement of the plug 146 in the sealing cover 143 .

[0042] Specifically, in this embodiment, Figure 6 As shown, the locating pin 141 is correspondingly installed in the stepped hole of the housing 81 by means of screws and washers 142, and a locating plug corresponding to the locating pin 141 is provided on the end cover 82. The locating plug is composed of a cover 143, a spring 145, a plug 146 and an elastic retaining ring 147. During assembly, the locating pin 141 extends into the cover 143 and contacts the plug 146, thereby squeezing the plug 56 and the spring 55. The purpose of providing the spring 145 is to play a role in buffering soft contact to avoid hard contact between the locating pin 141 and the locating plug, thereby improving the adaptability of the housing and the gear train assembly during assembly.

[0043] In some embodiments, the bracket assembly 15 includes a first connecting arm 151, a second connecting arm 152 and a third connecting arm 153 that are hinged to each other, wherein one end of the first connecting arm 151 is set at the top of the shell 81 through a rotating shaft 154, the first connecting arm 151 rotates around the rotating shaft 154, and the third connecting arm 153 is fixedly connected to the outer wall of the end cover 82 by screws.

[0044] Specifically, in this embodiment, Figure 7 As shown, the bracket assembly 15 is composed of three connected connecting arms, each connecting arm is connected by a rotating shaft 154, each rotating shaft 154 can rotate 360 degrees, and has a high degree of rotational freedom. One end of the first connecting arm 151 is set at the top of the shell 81 through the rotating shaft 154, and the third connecting arm 153 is fixedly connected to the end cover 82 by a screw. When disassembling and assembling the gear box 8 housing, the separation and assembly of the shell 81 and the end cover 82 are achieved by controlling the rotation of the bracket assembly 15.

[0045] The bracket assembly 15 used in this embodiment has a high degree of freedom and can realize multi-directional movement, which can effectively avoid the interference of the outer shell on the gear when disassembling and assembling the gear. While ensuring the relative height of the shell 81, it is convenient to keep the shell 81 concentric with the shaft after installation.

[0046] Working principle: After the test, it is necessary to open the box to disassemble the gear, analyze the gear surface lubrication condition and replace the gear. At this time, the positioning pin 141 must be removed first, and then the box shell must be opened. At this time, the bracket assembly 15 can fix the disassembled shell to ensure that the gear box 8 shell and the gear shaft are concentric when the cover is closed (in layman's terms, the gear box 8 is divided into a shell 81 and an end cover 82, which are assembled together. When the shell 81 and the end cover 82 are installed, the positioning pin 141 must be used to determine the installation position to ensure that the shell 81 and the end cover 82 are installed tightly. The shell and the input shaft and the output shaft can be assembled together. To ensure alignment; in addition, both the bracket assembly 15 and the locating pin 141 serve to ensure more precise alignment of the housing 81 and the end cover 82 during installation. During disassembly, the locating pin 141 is first removed, and the end cover 82 is rotated to a position where it does not interfere with operation via the multi-hinge structure of the bracket assembly 15. The bracket assembly 15 also fixes the relative height of the housing 81, keeping the end cover 82 concentric with the shaft. This effectively eliminates the wear of bearings and other components caused by misalignment, and reduces time and effort when disassembling the gearbox 8, ensuring the sustainability and economical operation of the oil test base 1.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

[0048] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A gear contact fatigue oil testing machine, characterized by: The oil testing machine adopts an electrically closed energy feedback method, and includes a test base, and a driving motor, a loading motor and a gear box arranged on the test base; The driving motor and the loading motor are located on the same side of the test base, and the output shaft end of the driving motor is connected to the high-speed shaft input end of the gear box, and the low-speed shaft output end of the gear box is connected to the loading motor input end.

2. The gear contact fatigue oil testing machine according to claim 1, characterized in that: The upper end surface of the test base is provided with a plurality of T-slots at intervals, and the driving motor and the loading motor are installed in the T-slots through fasteners; The bottom of the test base is also provided with multiple groups of shock absorbing components.

3. The gear contact fatigue oil testing machine according to claim 1, characterized in that: The output shaft end of the driving motor is connected to the first torque sensor and the coupling in sequence, and is fixedly connected to the input high-speed shaft of the gearbox through a flange. The first torsion sensor is supported by a first fixed bracket and is arranged on the test base.

4. The gear contact fatigue oil testing machine according to claim 1, characterized in that: The low-speed shaft at the output end of the gearbox is connected in sequence to the second torque sensor and the locked-rotor structure, and is also connected to the input end of the loading motor; The second torque sensor and the stall structure are supported by a second fixing bracket and are arranged on the test base.

5. The gear contact fatigue oil testing machine according to claim 4, characterized in that: Protective covers are also installed on the outer sides of the second torque sensor and the locked-rotor structure.

6. The gear contact fatigue oil testing machine according to claim 1, characterized in that: The gearbox includes a housing, an end cover, a high-speed gear shaft system and a low-speed gear shaft system. The bottom end of the housing is fixedly connected to the test base through a provided base, and further includes: Positioning members, the number of which is at least two, including a positioning pin and a positioning plug, the positioning pin being provided on the housing, the positioning plug being provided on the end cover, the positioning pin being correspondingly plugged into the positioning plug; The bracket assembly is a multi-hinge structure, one end of which is arranged at the top of the shell and the other end is fixedly connected to the end cover.

7. The gear contact fatigue oil testing machine according to claim 6, characterized in that: The housing is provided with a stepped hole, the positioning pin is correspondingly arranged in the stepped hole, and a gasket is provided on the side away from the end cover, and the positioning pin is fixedly connected to the gasket by a screw; The end of the positioning pin is arranged in a tapered structure.

8. The gear contact fatigue oil testing machine according to claim 7, characterized in that: The end cover is provided with a through hole corresponding to the stepped hole, and an embedded part is provided at the through hole. The positioning plug includes a cover, which is a semi-enclosed structural part with an opening on one side and a built-in accommodating cavity. The cover is fixedly connected to the embedded part. A spring is installed in the cover, and the spring is limited to the accommodating cavity by a plug. The positioning pin extends into the cover to compress the plug and the spring. A limiting structure for limiting the movement of the plug is also provided in the sealing cover.

9. The gear contact fatigue oil testing machine according to claim 8, characterized in that: An annular groove is provided on the inner wall of the sealing cover, and an elastic retaining ring is correspondingly installed in the annular groove.

10. The gear contact fatigue oil testing machine according to claim 6, characterized in that: The bracket assembly includes a first connecting arm, a second connecting arm and a third connecting arm that are hinged to each other, wherein one end of the first connecting arm is set at the top of the shell through a rotating shaft, the first connecting arm rotates around the rotating shaft, and the third connecting arm is fixedly connected to the outer wall of the end cover by a screw.

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