Friction and wear testing apparatus

Abstract

The utility model relates to the technical field of friction and wear test, disclose a kind of friction and wear test device for testing the friction and wear performance of bearing, friction and wear test device includes oil box, mandrel and main shaft, oil box has the accommodating cavity of accommodating lubricating oil and the through-hole being communicated with accommodating cavity and outside, and the bearing is fixedly arranged in accommodating cavity, mandrel includes the first end fixedly connected with the inner ring of bearing and the second end through the through-hole and with oil box clearance cooperation, main shaft includes first end and the second end with driving mechanism transmission connection, one of main shaft's first end and mandrel's second end is set as protrusion, the other of main shaft's first end and mandrel's second end is set as the recess adapted with protrusion, protrusion is set as along the axial insertion recess of main shaft and along the radial close adhesion recess of main shaft to make mandrel and main shaft keep coaxial arrangement.Protrusion and recess setting can be along the radial close adhesion of main shaft, so that main shaft and mandrel always keep coaxial arrangement.

Description

Technical Field

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

[0002] In the fields of mechanical engineering and materials science, tribological properties are important indicators for evaluating the durability of lubricants, materials, and mechanical components. Tribological testing equipment, as key testing devices, is widely used in lubricant development, mechanical component life assessment, and surface property research.

[0003] A friction and wear testing device for detecting the friction and wear performance of bearings includes an oil box, a mandrel, a main shaft, and a drive mechanism. The oil box contains lubricating oil, and the bearing is fixedly installed inside the oil box. The lubricating oil in the oil box provides a lubrication environment for the bearing. One end of the mandrel is fixedly connected to the inner ring of the bearing, and the other end of the mandrel is provided with a groove. The main shaft is inserted into the groove and fixed to the mandrel by a connecting pin. The drive mechanism can drive the main shaft to rotate, thereby driving the mandrel and the bearing to rotate to detect the friction and wear performance of the bearing.

[0004] However, there is a large gap at the connection between the main shaft and the mandrel of the above-mentioned friction and wear testing device, which makes it impossible for the main shaft and the mandrel to maintain a coaxial state. Radial runout occurs during the rotation of the main shaft and the mandrel, which not only affects the test accuracy, but may also introduce additional energy loss and vibration interference, thus affecting the final performance measurement results. Utility Model Content

[0005] The purpose of this invention is to overcome the problem that the connection between the spindle and mandrel in existing friction and wear testing devices has a large gap, which prevents the spindle and mandrel from maintaining a coaxial state. During rotation, the spindle will exhibit radial runout, which not only affects the testing accuracy but may also introduce additional energy loss and vibration interference, thus affecting the final performance measurement results. This invention provides a friction and wear testing device.

[0006] To achieve the above objectives, this utility model provides a friction and wear testing device for testing the friction and wear performance of bearings. The friction and wear testing device includes: an oil box having a cavity for containing lubricating oil and a through hole connecting the cavity to the outside, wherein the bearing is fixedly disposed within the cavity; a mandrel having a first end fixedly connected to the inner ring of the bearing and a second end passing through the through hole and clearance-fitted with the oil box; and a main shaft having a first end and a second end connected to a drive mechanism. One of the first end of the main shaft and the second end of the mandrel is configured as a protrusion, and the other of the first end of the main shaft and the second end of the mandrel is configured as a groove adapted to the protrusion. The protrusion is configured to insert into the groove along the axial direction of the main shaft and to fit tightly against the groove along the radial direction of the main shaft so that the mandrel and the main shaft are coaxially arranged.

[0007] In some embodiments, the protrusion is configured as a tapered protrusion, and the groove is configured as a tapered groove.

[0008] In some embodiments, the conical groove includes a first conical surface and a first plane connected together, and the conical protrusion includes a second conical surface and a second plane connected together. When the conical protrusion is inserted into the conical groove, the first conical surface and the second conical surface are in close contact, and the first plane and the second plane are in close contact or spaced apart along the axial direction of the main shaft.

[0009] In some embodiments, the friction and wear testing apparatus further includes a fixing member configured to fix the first end of the spindle to the second end of the mandrel.

[0010] In some embodiments, the fixing element is a fixing pin, which is configured to pass through the connecting hole at the second end of the mandrel and the connecting hole at the first end of the spindle.

[0011] In some embodiments, the oil box includes: a box body, one side of which has an opening communicating with the receiving cavity and the outside; and a cover plate, which is used to seal the opening and has the through hole.

[0012] In some embodiments, the cover plate is configured to press the bearing against an annular groove within the housing.

[0013] In some embodiments, the friction and wear testing apparatus further includes a cooling assembly for controlling the temperature of the lubricating oil within the receiving cavity; and / or the friction and wear testing apparatus further includes a lifting assembly for adjusting the height of the oil box.

[0014] In some embodiments, the cooling assembly includes: a cooling box configured to surround the outer wall of the oil box and form a cooling cavity for containing coolant between the cooling box and the outer wall of the oil box; and a reservoir connected to the cooling cavity via an inlet channel and an outlet channel to allow coolant to circulate within the cooling cavity.

[0015] In some embodiments, the outer wall of the oil box is provided with a plurality of heat dissipation grooves; and / or the cooling assembly further includes a temperature sensor for detecting the temperature of the coolant in the cooling chamber.

[0016] Through the above technical solution, the first end of the spindle and the second end of the mandrel are fixedly connected by matching protrusions and grooves. These protrusions and grooves fit tightly along the radial direction of the spindle, preventing gaps at the connection point and ensuring that the spindle and mandrel remain coaxial. This guarantees the positioning accuracy of the spindle and mandrel, avoids radial runout during rotation caused by misalignment, improves the testing accuracy of the friction and wear testing device, avoids introducing additional energy loss and vibration interference, and ensures the accuracy of the bearing friction and wear performance test results. The bearing is placed in an oil box, where the lubricating oil provides a lubricating environment. The drive mechanism drives the spindle to rotate, thereby causing the mandrel and bearing to rotate, in order to test the bearing's friction and wear performance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the friction and wear testing device disclosed in this utility model; Figure 2 This is a side view of the friction and wear testing device disclosed in this utility model; Figure 3 yes Figure 2 Sectional view at point AA; and Figure 4 This is a schematic diagram of the structure of the friction and wear testing device disclosed in this utility model, showing the insertion of the spindle into the mandrel.

[0018] Explanation of reference numerals in the attached figures Detailed Implementation

[0019] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the following specific embodiments of this utility model.

[0020] It should be noted beforehand that the directional terms used in the descriptions of the various embodiments below, such as "inner" and "outer", refer to the technical distinction between the inside and outside of the oil box.

[0021] The existing friction and wear testing equipment has a large gap at the connection between the spindle and the mandrel, which prevents the spindle and mandrel from maintaining a coaxial state. During rotation, the spindle experiences radial runout, which not only affects the test accuracy but may also introduce additional energy loss and vibration interference, thus affecting the final performance measurement results.

[0022] To address the aforementioned technical problems of existing friction and wear testing devices, this invention provides a friction and wear testing device for testing the friction and wear performance of bearing 7. (See also...) Figures 1 to 4 The friction and wear testing device includes an oil box 1, a spindle 2, and a main shaft 3. The oil box 1 has a receiving cavity 11 for containing lubricating oil and a through hole connecting the receiving cavity 11 to the outside. A bearing 7 is fixedly installed in the receiving cavity 11. The spindle 2 includes a first end fixedly connected to the inner ring of the bearing 7 and a second end passing through the through hole and clearance-fitted with the oil box 1. The main shaft 3 includes a first end and a second end connected to the drive mechanism. One of the first end of the main shaft 3 and the second end of the spindle 2 is configured as a protrusion, and the other of the first end of the main shaft 3 and the second end of the spindle 2 is configured as a groove adapted to the protrusion. The protrusion is configured to be inserted into the groove along the axial direction of the main shaft 3 and tightly fitted to the groove along the radial direction of the main shaft 3 so that the spindle 2 and the main shaft 3 are kept coaxial.

[0023] The first end of the main spindle 3 and the second end of the spindle 2 are fixedly connected by a matching protrusion and groove. The protrusion and groove fit tightly along the radial direction of the main spindle 3, preventing gaps at the connection point and ensuring that the main spindle 3 and spindle 2 remain coaxial. This guarantees the positioning accuracy of the main spindle 3 and spindle 2, avoids radial runout during rotation caused by misalignment of the main spindle 3 and spindle 2, improves the testing accuracy of the friction and wear testing device, avoids introducing additional energy loss and vibration interference, and ensures the accuracy of the bearing 7's friction and wear performance test results. The bearing 7 is placed inside the oil box 1, where the lubricating oil provides a lubricating environment for the bearing 7. The drive mechanism drives the main spindle 3 to rotate, thereby causing the spindle 2 and bearing 7 to rotate, in order to test the friction and wear performance of the bearing 7.

[0024] In the above basic embodiment, the bearing 7 includes an inner ring and an outer ring that are rotatably connected. The outer ring of the bearing 7 is fixedly installed in the oil box 1, and the inner ring of the bearing 7 is fixedly connected to the second end of the spindle 2. The bearing 7 can support the spindle 2 and withstand the radial load during the rotation test. The drive mechanism drives the main shaft 3 to rotate, thereby driving the spindle 2 to rotate, so that the inner ring of the bearing 7 rotates relative to the outer ring of the bearing 7, and the friction and wear performance of the bearing 7 is tested. At the same time, the bearing 7 can apply shear force to the lubricating oil during rotation to simulate the state of the lubricating oil under real working conditions.

[0025] It should be noted that the inner ring of bearing 7 and the first end of spindle 2 can be fixedly connected by interference fit.

[0026] The first end of the mandrel 2 includes a first part and a second part. The outer diameter of the first part is smaller than the outer diameter of the second part. The inner ring of the bearing 7 is fitted outside the first part of the mandrel 2.

[0027] In the above, for example Figure 3 and Figure 4 As shown, the protrusion is configured as a conical protrusion 31, and the groove is configured as a conical groove 21. The configuration of the conical protrusion 31 and the conical groove 21 allows for a tighter fit between the two and makes their separation easier and faster. The configuration of the conical protrusion 31 and the conical groove 21 allows the conical protrusion 31 to be inserted into the conical groove 21 along the axial direction of the main shaft 3. Even if there is a gap between the conical protrusion 31 and the conical groove 21, the conical protrusion 31 will slide into the conical groove 21 under the action of gravity, achieving a high-precision fit between the first end of the main shaft 3 and the second end of the spindle 2, thus ensuring a tight fit between the two.

[0028] In some embodiments, the first end of the spindle 3 is provided with a tapered protrusion 31, and the second end of the spindle 2 is provided with a tapered groove 21. The tapered protrusion 31 can be inserted into the tapered groove 21 to achieve a coaxial fixed connection between the spindle 3 and the spindle 2.

[0029] Optionally, the first end of the spindle 3 is provided with a tapered groove 21, and the second end of the spindle 2 is provided with a tapered protrusion 31.

[0030] In the above, the conical groove 21 includes a first conical surface 22 and a first plane 23 connected together, and the conical protrusion 31 includes a second conical surface 32 and a second plane 33 connected together. When the conical protrusion 31 is inserted into the conical groove 21, the first conical surface 22 and the second conical surface 32 fit together tightly, and the first plane 23 and the second plane 33 fit together tightly or are spaced apart along the axial direction of the main shaft 3.

[0031] The first plane 23 and the second plane 33 are in close contact. When the conical protrusion 31 is inserted into the conical groove 21, the first conical surface 22 of the conical groove 21 is in close contact with the second conical surface 32 of the conical protrusion 31. At the same time, the first plane 23 of the conical groove 21 and the second plane 33 of the conical protrusion 31 are in close contact, so that the conical groove 21 and the conical protrusion 31 are in double-sided contact, realizing high-precision alignment of the main shaft 3 and the spindle 2, ensuring that the two maintain good coaxiality, and also enhancing the rigidity and stability of the connection between the main shaft 3 and the spindle 2. This effectively avoids shaft misalignment caused by assembly errors or dynamics, thereby reducing radial runout and energy loss during rotation, and improving the operating accuracy and reliability of the friction and wear testing device.

[0032] In some embodiments, see Figure 3 and Figure 4 The first plane 23 and the second plane 33 are spaced apart along the axial direction of the main shaft 3. When the conical protrusion 31 is inserted into the conical groove 21, the first conical surface 22 of the conical groove 21 and the second conical surface 32 of the conical protrusion 31 are tightly fitted together. At the same time, the first plane 23 of the conical groove 21 and the second plane 33 of the conical protrusion 31 are spaced apart along the axial direction of the main shaft 3. This ensures high-precision coaxiality between the main shaft 3 and the spindle 2, while also effectively separating the conical protrusion 31 and the conical groove 21.

[0033] In the above, for example Figure 3 and Figure 4 As shown, the friction and wear testing apparatus also includes a fixing component, which is configured to fix the first end of the spindle 3 to the second end of the mandrel 2. The fixing component can further fix the spindle 3 and the mandrel 2, ensuring the stability of the relative position of the spindle 3 and the mandrel 2, and improving the coaxiality accuracy of the spindle 3 and the mandrel 2.

[0034] The fixing component is a fixing pin 4, which is configured to pass through the connecting hole at the second end of the mandrel 2 and the connecting hole at the first end of the spindle 3. After the first end of the spindle 3 is inserted into the second end of the mandrel 2, the connecting holes at the second end of the mandrel 2 and the first end of the spindle 3 are aligned. Then, the fixing pin 4 is inserted into the connecting holes at the second end of the mandrel 2 and the first end of the spindle 3, further enhancing the accuracy and stability of the connection between the second end of the mandrel 2 and the first end of the spindle 3, avoiding misalignment of the mandrel 2 and the spindle 3 due to assembly deviations or external vibrations, and improving the accuracy of the friction and wear testing device.

[0035] The oil box 1 of the above-described basic embodiment of this utility model cleverly employs a box body 12 and a cover plate 13 in combination. One side of the box body 12 has an opening connecting the receiving cavity 11 to the outside. The cover plate 13 is used to seal the opening and has a through hole. The opening on one side of the box body 12 facilitates the installation or removal of the bearing 7. The seal of the opening by the cover plate 13 prevents the lubricating oil in the receiving cavity 11 of the box body 12 from overflowing and prevents external impurities from entering the box body 12 and affecting the test results. The through hole of the cover plate 13 allows the mandrel 2 to pass through, thereby achieving a fixed connection between the mandrel 2 and the inner ring of the bearing 7.

[0036] The cover plate 13 can be detachably connected to the housing 12 to allow for the installation or removal of the bearing 7. Alternatively, the cover plate 13 and the housing 12 can be fixedly connected by fasteners. For example, the cover plate 13 and the housing 12 can be fixedly connected by bolts or clips.

[0037] A seal is provided between the cover plate 13 and the box body 12 to prevent lubricating oil in the oil box 1 from leaking out from the gap between the cover plate 13 and the box body 12. For example, the seal can be an O-ring or a gasket. The seal is usually made of an oil-resistant, high-temperature-resistant material with good elasticity, such as rubber or silicone, to meet the sealing requirements under different temperature and pressure conditions.

[0038] In some embodiments, the cover plate 13 is configured to press the bearing 7 against the annular groove 14 inside the housing 12. The bearing 7 is placed on the annular groove 14 inside the housing 12, and then the cover plate 13 is placed over the opening of the housing 12 and pressed against the outer ring of the bearing 7, so that the bearing 7 is fixedly installed in the oil box 1 and can be easily installed and removed, ensuring the relative rotation of the inner and outer rings of the bearing 7.

[0039] It is understood that the cover plate 13 includes a plate body and a protrusion. The protrusion protrudes circumferentially around the plate body and is disposed on the plate body. When the cover plate 13 is placed on the box body 12, the plate body of the cover plate 13 is used to seal the opening, and the protrusion of the cover plate 13 is used to press the outer ring of the bearing 7 against the annular groove 14 of the box body 12.

[0040] The lubricant in the oil box 1 generates heat due to friction during the rotation of the bearing 7. Excessive temperature can affect the performance of the lubricant. Therefore, the friction and wear testing device also includes a cooling assembly 5, which is used to control the temperature of the lubricant in the receiving cavity 11. The cooling assembly 5 can regulate and maintain the temperature of the lubricant in the receiving cavity 11 to ensure the stability of the lubricant's performance.

[0041] See above. Figures 1 to 3 The cooling assembly 5 includes a cooling box 51 and a liquid storage tank. The cooling box 51 is configured to surround the outer wall of the oil box 1 and form a cooling cavity 52 for containing coolant between the cooling box 51 and the outer wall of the oil box 1. The liquid storage tank is connected to the cooling cavity 52 through an inlet channel 53 and an outlet channel 54 to allow the coolant in the cooling cavity 52 to circulate. The cooling box 51, which surrounds the outer wall of the oil box 1, forms a cooling cavity 52 for containing coolant. The coolant in the cooling cavity 52 exchanges heat with the lubricating oil in the oil box 1 by contacting the outer wall of the oil box 1, thus preventing the lubricating oil from overheating and affecting its performance. The lubricating oil in the liquid storage tank can flow into the cooling cavity 52 through the inlet channel 53, and the lubricating oil in the cooling cavity 52 can flow into the liquid storage tank through the outlet channel 54, thereby realizing the circulation of the lubricating oil in the cooling cavity 52 and controlling the temperature of the lubricating oil in the storage cavity 11.

[0042] The liquid inlet channel 53 and the liquid outlet channel 54 include a liquid outlet and a liquid inlet provided on the cooling box 51, a bamboo joint connecting the liquid outlet and the liquid storage tank, and a bamboo joint connecting the liquid inlet and the liquid storage tank. The bamboo joint is threaded to the liquid outlet and the liquid inlet for easy disassembly and maintenance.

[0043] A sealing structure is provided at the connection between the cooling box 51 and the outer wall of the oil box 1 to prevent coolant leakage. The inner wall of the cooling box 51 is processed by precision CNC machining processes such as high-precision milling, grinding or polishing to give it a high degree of flatness and a low surface roughness, thereby reducing the frictional resistance between the coolant and the inner wall of the cooling box 51 during flow and improving the flow efficiency of the coolant.

[0044] The cooling assembly 5 also includes a temperature sensor 55, which detects the temperature of the coolant within the cooling chamber 52. The temperature control module controls the circulation of the coolant within the cooling chamber 52 based on the temperature detected by the temperature sensor 55, ensuring that the coolant temperature within the cooling chamber 52 is maintained at the temperature required for the test. One end of the temperature sensor 55 passes through the cover plate 13 and extends into the receiving cavity 11 of the oil box 1 to detect the temperature of the lubricating oil; the other end of the temperature sensor 55 is electrically connected to the temperature control module.

[0045] When the temperature sensor 55 detects that the coolant temperature is higher than the set range, the temperature control module can increase the coolant circulation speed to quickly reduce the temperature of the lubricating oil, thereby achieving precise control of the lubricating oil temperature in the oil box 1, improving the automation level and temperature control accuracy of the friction and wear test device, avoiding changes in lubricating oil performance caused by temperature fluctuations, and ensuring the stability of the lubrication state of the lubricating oil during the friction and wear test.

[0046] In the aforementioned structure of the oil box 1, multiple heat dissipation grooves 15 are provided on the outer wall of the oil box 1. The heat dissipation grooves 15 increase the contact area between the oil box 1 and the coolant in the cooling chamber 52, thereby improving the heat exchange efficiency of the lubricating oil, ensuring that the bearing 7 remains within a stable operating temperature range during the test, and improving the accuracy of the bearing 7's friction and wear performance and the repeatability of the test results. The size of the heat dissipation grooves 15 can be at the micrometer level.

[0047] In some embodiments, the friction and wear testing apparatus further includes a lifting assembly 6, which is used to adjust the height of the oil box 1. The lifting assembly 6 adjusts the height of the oil box 1 to ensure that its height meets the test requirements. The lifting assembly 6 also fine-tunes the height of the oil box 1 according to actual test needs, ensuring that the contact state between the spindle 3, mandrel 2, and bearing 7 meets standard test conditions, thus improving the consistency and repeatability of the test. The lifting assembly 6 consists of a lead screw and a slider.

[0048] Alternatively, the oil box 1 can be fixedly placed on the operating table, and the lifting component 6 can control the lifting of the operating table to control the lifting of the oil box 1.

[0049] The specific test steps of the friction and wear testing device proposed in this utility model are as follows: The bearing 7 is placed in the annular groove 14 of the housing 12 through the opening. The first end of the spindle 2 is fixed to the inner ring of the bearing 7. Lubricating oil is injected into the housing 12 through the opening. The cover plate 13 is placed over the opening of the housing 12, and the second end of the spindle 2 can pass through the through hole of the cover plate 13. The protrusion of the cover plate 13 abuts against the outer ring of the bearing 7 to fix the outer ring of the bearing 7 to the annular groove 14 of the housing 12. The first end of the spindle 3 is inserted into the second end of the spindle 2, and the first end of the spindle 3 and the second end of the spindle 2 are fixedly connected by the fixing pin 4. The drive mechanism drives the spindle 3 to rotate. Coolant is supplied to the cooling chamber 52 from the liquid storage tank through the liquid inlet channel 53.

[0050] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention. This includes combining various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A friction and wear testing device, characterized in that, The friction and wear testing apparatus is used to test the friction and wear performance of the bearing (7), and includes: Oil box (1), the oil box (1) has a receiving cavity (11) for receiving lubricating oil and a through hole connecting the receiving cavity (11) and the outside. The bearing (7) is fixedly installed in the receiving cavity (11). A mandrel (2), the mandrel (2) comprising a first end fixedly connected to the inner ring of the bearing (7) and a second end passing through the through hole and clearance-fitted with the oil box (1); and The main shaft (3) includes a first end and a second end that is connected to the drive mechanism. One of the first end of the main shaft (3) and the second end of the spindle (2) is configured as a protrusion, and the other of the first end of the main shaft (3) and the second end of the spindle (2) is configured as a groove that fits the protrusion. The protrusion is configured to be inserted into the groove along the axial direction of the main shaft (3) and to be tightly fitted to the groove along the radial direction of the main shaft (3) so that the spindle (2) and the main shaft (3) are kept coaxial.

2. The friction and wear testing apparatus according to claim 1, characterized in that, The protrusion is configured as a conical protrusion (31), and the groove is configured as a conical groove (21).

3. The friction and wear testing apparatus according to claim 2, characterized in that, The conical groove (21) includes a first conical surface (22) and a first plane (23) connected together. The conical protrusion (31) includes a second conical surface (32) and a second plane (33) connected together. When the conical protrusion (31) is inserted into the conical groove (21), the first conical surface (22) and the second conical surface (32) fit tightly together, and the first plane (23) and the second plane (33) fit tightly together or are spaced apart along the axial direction of the main shaft (3).

4. The friction and wear testing apparatus according to claim 1, characterized in that, The friction and wear testing device also includes a fixing component, which is configured to fix the first end of the main shaft (3) to the second end of the mandrel (2).

5. The friction and wear testing apparatus according to claim 4, characterized in that, The fixing component is a fixing pin (4), which is configured to pass through the connecting hole at the second end of the spindle (2) and the connecting hole at the first end of the spindle (3).

6. The friction and wear testing apparatus according to claim 1, characterized in that, The oil box (1) includes: The box body (12) has an opening on one side that connects the receiving cavity (11) to the outside; and A cover plate (13) is provided to seal the opening and has the through hole.

7. The friction and wear testing apparatus according to claim 6, characterized in that, The cover plate (13) is configured to press the bearing (7) against the annular groove (14) inside the housing (12).

8. The friction and wear testing apparatus according to any one of claims 1-7, characterized in that, The friction and wear testing device further includes a cooling assembly (5) for controlling the temperature of the lubricating oil within the receiving cavity (11); and / or The friction and wear testing device also includes a lifting assembly (6), which is used to adjust the height of the oil box (1).

9. The friction and wear testing apparatus according to claim 8, characterized in that, The cooling assembly (5) includes: A cooling box (51), wherein the cooling box (51) is configured to surround the outer wall of the oil box (1) and form a cooling cavity (52) for containing coolant between the cooling box (1) and the outer wall of the oil box (1); and The liquid storage tank is connected to the cooling chamber (52) through an inlet channel (53) and an outlet channel (54) to allow the coolant in the cooling chamber (52) to circulate.

10. The friction and wear testing apparatus according to claim 9, characterized in that, The outer wall of the oil box (1) is provided with multiple heat dissipation grooves (15); and / or The cooling assembly (5) also includes a temperature sensor (55) for detecting the temperature of the coolant in the cooling chamber (52).

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