A clutch friction performance testing device

Abstract

This invention discloses a clutch friction performance testing device, belonging to the technical field of clutch testing devices. It includes a constant-speed friction testing machine body, on which a rotating motor, a main shaft, a friction sample disc, a planar spiral heating tube, and a loading lever assembly are mounted. A hydraulic heating piston assembly and a primary elastic loading piston assembly are sequentially slidably arranged within the hydraulic tube. A drive assembly is connected to the hydraulic heating piston assembly via a limit plate assembly, and the secondary elastic loading piston assembly is connected to the loading lever assembly. This invention uses the drive assembly to move the hydraulic heating piston assembly and the primary elastic loading piston assembly, pushing the loading lever assembly upwards or downwards to adjust the pressure of the clutch friction plate on the friction sample disc. This reduces the workload of testing personnel, and the hydraulic transmission method is more stable, avoiding data errors caused by weight impacts. The poor compressibility of liquids is utilized to achieve pressure locking, ensuring constant pressure.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, specifically to a clutch friction performance testing device. Background Technology

[0002] Clutch friction performance testing is mainly used to evaluate key performance indicators such as friction coefficient and wear rate of clutch friction plates under different temperature, load and speed conditions, in order to verify whether their material properties meet the usage standards, thereby ensuring that the clutch has stable engagement and disengagement capabilities in actual transmission. Existing clutch friction performance testing technology usually relies on manual weight loading, which has problems such as high labor intensity, easy impact during operation leading to inaccurate test data, and high dependence on operator experience. At the same time, traditional devices are difficult to uniformly heat the sample while maintaining a constant positive pressure, resulting in inconsistent control of test variables and dead zones in heating, affecting the reliability and efficiency of test results.

[0003] Most existing constant-speed friction testing machines use manual weight addition for loading, which is not only labor-intensive, but also causes impact on the device when adding weights, leading to deviations in test data and making it impossible to guarantee the stability of pressure application.

[0004] To address the above issues, a test device for detecting clutch friction performance is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a clutch friction performance testing device. By using this device, the problem of existing constant speed friction testing machines, which mostly use manual addition of weights for loading, is not only labor-intensive, but also causes impact on the device when adding weights, resulting in deviations in test data and making it impossible to guarantee the stability of pressure application is solved.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A clutch friction performance testing device is provided, comprising a constant-speed friction testing machine body. The body is equipped with a rotating motor, a main shaft, a friction sample disc, a planar spiral heating tube, and a loading lever assembly. The loading lever assembly is equipped with a clutch friction plate. A protective cover is fixed on the constant-speed friction testing machine body. Inside the protective cover are a drive assembly, a limit disc assembly, an annular tube, and several hydraulic tubes. A hydraulic heating piston assembly and a primary elastic loading piston assembly are slidably arranged sequentially inside the hydraulic tubes. The hydraulic heating piston assembly and the primary elastic loading piston assembly divide the inner cavity of the hydraulic tube into a vacuum chamber, a hydraulic heating chamber, and a hydraulic loading chamber. The drive assembly is driven and connected to the hydraulic heating piston assembly via the limit disc assembly. The hydraulic heating chamber is connected to the planar spiral heating tube via a first solenoid valve and the annular tube. The hydraulic loading chamber is connected to the secondary elastic loading piston assembly via a second solenoid valve. The secondary elastic loading piston assembly is driven and connected to the loading lever assembly.

[0007] The loading lever assembly includes a Y-shaped pressure bar, which is slidably connected to the body of the constant speed friction testing machine. The lower end of the Y-shaped pressure bar is fixedly connected to a clutch friction plate, which is in close contact with the upper surface of the friction sample plate. A main lever is rotatably connected to the body of the constant speed friction testing machine. A first slide groove and a second slide groove are provided on the main lever. The upper end of the Y-shaped pressure bar is slidably connected to the first slide groove.

[0008] The drive assembly includes a drive motor, which is fixedly connected inside the protective cover. A bevel gear one is fixedly connected to the output end of the drive motor. A transmission shaft is rotatably connected inside the protective cover. A gear and a bevel gear two are fixedly connected to the transmission shaft. The bevel gear two meshes with the bevel gear one.

[0009] A connecting shaft is fixedly connected inside the protective cover. The limiting disk assembly includes a turntable, which is rotatably connected to the connecting shaft. A toothed ring is fixedly connected to the turntable, and the toothed ring meshes with a gear. A star-shaped groove is formed on the turntable.

[0010] Each of the aforementioned hydraulically heated piston assemblies includes a piston rod, which is slidably connected to a hydraulic pipe. A circular slider is fixedly connected to the piston rod, which is slidably connected in a star-shaped groove. A thermostatic piston is fixedly connected to the piston rod.

[0011] Each of the aforementioned primary elastic loading piston assemblies includes a loading piston, which is slidably connected to a piston rod. A hydraulic spring is coaxially arranged with the piston rod. One end of the hydraulic spring is fixedly connected to the loading piston, and the other end of the hydraulic spring is fixedly connected to a hot-pressing piston. The hot-pressing piston, the loading piston, and the hydraulic pipe form a hydraulic heating chamber. The loading piston and the hydraulic pipe form a hydraulic loading chamber. The hot-pressing piston and the hydraulic pipe form a vacuum chamber.

[0012] The annular tube has an inlet and an outlet, and each inlet and outlet is fixedly connected to a one-way valve. The one-way valves at the inlet and outlet are respectively connected to the two ends of the planar spiral heating tube through two hoses. The secondary elastic loading piston assembly includes a hydraulic chamber, which is fixedly connected to the top of the connecting shaft. The hydraulic chamber and the second solenoid valve at the corresponding position of the hydraulic loading chamber are connected through a hose.

[0013] The secondary elastic loading piston assembly also includes a booster piston, which is slidably connected in a hydraulic chamber. A loading spring is provided in the hydraulic chamber, with its upper end fixedly connected to the booster piston and its lower end fixedly connected to the bottom of the hydraulic chamber. A booster rod is coaxially arranged with the booster piston, with its lower end fixedly connected to the booster piston and its upper end slidably connected to a second slide groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This device drives the hydraulic heating piston assembly and the primary elastic loading piston assembly to move through the drive assembly, which in turn pushes the liquid in the hydraulic loading chamber into the secondary elastic loading piston assembly, thereby pushing the loading lever assembly to move up or down to adjust the pressure of the clutch friction plate on the friction sample plate. This reduces the labor intensity of the test personnel, and the hydraulic transmission method is more stable, avoiding data errors caused by the impact of weights. When the pressure of the clutch friction plate on the friction sample plate reaches the set pressure, the second solenoid valve is closed. The poor compressibility of the liquid can be used to achieve pressure locking and ensure constant pressure. 2. After the loading stage is completed, the second solenoid valve of the hydraulic loading chamber is closed to lock the pressure of the clutch friction plate on the friction sample plate. At the same time, the first solenoid valve of the hydraulic heating chamber is opened to circulate the high-temperature solution and heat the planar spiral heating tube. Through the heat conduction, the friction sample plate is heated. This allows for the simulation of high-temperature conditions under the premise that the pressure of the clutch friction plate on the friction sample plate is constant, making the test variable singular and effectively improving the accuracy of the test results. 3. The steps required for testing personnel are relatively simple, and the device can complete the loading and heating process, reducing the reliance on the operator's experience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a cross-sectional view of the overall three-dimensional structure of the friction sample disk of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the protective cover of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of region A in the middle; Figure 5 This is a three-dimensional cross-sectional view of the hydraulic pipe structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of region B in the middle; Figure 7 This is a three-dimensional cross-sectional view of the secondary elastic loading piston assembly of the present invention. Figure 8 This is a schematic diagram of the overall three-dimensional structure of the turntable of the present invention.

[0016] In the diagram: 1. Constant speed friction testing machine body; 2. Rotary motor; 3. Main shaft; 4. Friction sample plate; 5. Planar spiral heating tube; 6. Loading lever assembly; 61. Y-shaped pressure bar; 62. Main lever; 63. First slide groove; 64. Second slide groove; 7. Clutch friction plate; 8. Protective cover; 81. Connecting shaft; 9. Drive assembly; 91. Drive motor; 92. Bevel gear one; 93. Transmission shaft; 94. Gear; 95. Bevel gear two; 10. Limiting plate assembly; 101. Turntable; 102. Gear ring; 103. Star groove; 20. Annular tube ; 201, Inlet; 202, Outlet; 203, Check valve; 30, Hydraulic pipe; 301, Hydraulic heating chamber; 302, Hydraulic loading chamber; 40, Hydraulic heating piston assembly; 401, Piston rod; 402, Circular slider; 403, Hot-pressing piston; 50, Primary elastic loading piston assembly; 501, Loading piston; 502, Hydraulic spring; 60, First solenoid valve; 601, Second solenoid valve; 70, Secondary elastic loading piston assembly; 701, Hydraulic chamber; 702, Pressure boosting piston; 703, Loading spring; 704, Pressure boosting rod. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] A clutch friction performance testing device, referring to Figures 1-5As shown, the machine includes a constant-speed friction testing machine body 1, which is equipped with a rotating motor 2, a main shaft 3, a friction sample disk 4, a planar spiral heating tube 5, and a loading lever assembly 6. The loading lever assembly 6 is equipped with a clutch friction plate 7. A protective cover 8 is fixed on the constant-speed friction testing machine body 1. Inside the protective cover 8, there is a drive assembly 9, a limit disk assembly 10, an annular tube 20, and several hydraulic pipes 30. A hydraulic heating piston assembly 40 and a primary elastic loading piston assembly 50 are slidably arranged in sequence inside the hydraulic pipes 30. The hydraulic heating piston assembly 40 and the primary elastic loading piston assembly 50 divide the inner cavity of the hydraulic pipe 30 into a vacuum chamber, a hydraulic heating chamber 301, and a hydraulic loading chamber 302. The drive assembly 9 is connected to the hydraulic heating piston assembly 40 via the limit disk assembly 10. The hydraulic heating chamber 301 is connected to the planar spiral heating tube 5 via a first solenoid valve 60 and an annular tube 20. The hydraulic loading chamber 302 is connected to the secondary elastic loading piston assembly 70 via a second solenoid valve 601. The secondary elastic loading piston assembly 70 is connected to the loading lever assembly 6. When testing the clutch friction plate 7, the rotary motor 2 is first started. As the rotary motor 2 rotates, the main shaft 3 rotates synchronously via the synchronous belt and synchronous pulley. The main shaft 3 then drives the friction sample disc 4 to rotate synchronously. The clutch friction plate 7 can be manually disassembled or fixed for easy replacement. Simultaneously with starting the rotary motor 2, the drive assembly 9 is started. The drive assembly 9, through transmission, causes the limit disc assembly 10 to rotate. The rotary motor 2, while rotating, also causes the friction sample disc 4 to rotate synchronously via the synchronous belt and synchronous pulley. In other words, starting the rotary motor 2 and the drive assembly 9 causes both the friction sample disc 4 and the limit disc assembly 10 to rotate. This setup ensures that when the limit disc assembly 10 rotates… The hydraulic heating piston assembly 40 reciprocates within the hydraulic pipe 30 via a transmission action. When the drive assembly 9 causes the limiting disc assembly 10 to rotate via a transmission action, and the hydraulic heating piston assembly 40 reciprocates within the hydraulic pipe 30 via the transmission action, the controller opens the second solenoid valve 601 at the hydraulic loading chamber 302 and closes the first solenoid valve 60 at the hydraulic heating chamber 301. The controller is existing technology. This causes the hydraulic heating piston assembly 40 to push the primary elastic loading piston assembly 50 to move, thereby reducing the volume of the hydraulic loading chamber 302 while keeping the volume of the hydraulic heating chamber 301 unchanged. During this process, the liquid in the hydraulic heating chamber 301 flows through the first solenoid valve 60... As the liquid flows out through the hose, the volume of liquid in the hydraulic heating chamber 301 remains constant. The liquid in the hydraulic heating chamber 301 flows into the secondary elastic loading piston assembly 70 through the first solenoid valve 60 and the hose, causing the secondary elastic loading piston assembly 70 to move upward. Through transmission, the loading lever assembly 6 drives the clutch friction plate 7 fixed thereto to move upward, thus reducing the normal pressure of the clutch friction plate 7 on the friction sample disc 4. As more liquid enters the secondary elastic loading piston assembly 70, the normal pressure of the clutch friction plate 7 on the friction sample disc 4 gradually decreases. When the normal pressure reaches the value required by the tester, the second solenoid valve 601 at the hydraulic loading chamber 302 position is closed, and the hydraulic heating chamber 301 position is opened. The first solenoid valve 60 is positioned on the hydraulic heating piston assembly. Subsequently, as the hydraulic heating piston assembly 40 drives the primary elastic loading piston assembly 50 to reciprocate within the hydraulic pipe 30, the volume of the hydraulic loading chamber 302 remains constant, while the volume of the hydraulic heating chamber 301 continuously changes. Specifically, when the hydraulic heating piston assembly 40 pushes the primary elastic loading piston assembly 50 to move forward within the hydraulic pipe 30, the primary elastic loading piston assembly 50 is compressed, reducing the volume of the hydraulic heating chamber 301. The high-temperature liquid within the hydraulic heating chamber 301 flows through the first solenoid valve 60 at the position of the hydraulic heating chamber 301 into the annular pipe 20, and then through the annular pipe 20 into the planar spiral heating pipe 5, heating the friction sample disc 4 to simulate high-temperature braking conditions.When the hydraulic heating piston assembly 40 pulls the primary elastic loading piston assembly 50 to move in the reverse direction within the hydraulic pipe 30, the primary elastic loading piston assembly 50 is stretched, increasing the volume of the hydraulic heating chamber 301. The liquid heated from the friction sample disc 4 flows out from the planar spiral heating pipe 5, sequentially through the hose, the annular pipe 20, and the first solenoid valve 60 at the hydraulic heating chamber 301, before flowing back into the hydraulic heating chamber 301. Once the temperature of the friction sample disc 4 reaches the temperature required by the tester, the drive assembly 9 is shut off. This device integrates loading and heating within the same hydraulic pipe 30. By setting a primary elastic loading piston assembly 50 and a hydraulic heating piston assembly 40 within the hydraulic pipe 30, the inner cavity of the hydraulic pipe 30 is divided into a hydraulic loading chamber 302 and a hydraulic heating chamber 301. The hydraulic pipe 30 simultaneously bears the dual functions of providing positive pressure and circulating heat medium, resulting in high space utilization. This device uses a drive assembly 9 to drive the hydraulic heating piston assembly 40 and the primary elastic loading piston assembly 50 to move, automatically pressing the liquid into the secondary elastic loading piston assembly 70, thereby pushing the loading lever assembly 6 to deflect counterclockwise, which in turn drives the clutch friction plate 7 to move upward, thereby reducing the pressure of the clutch friction plate 7 on the friction sample disc 4. This setup not only reduces the labor intensity of the testing personnel and automates the loading process, but also uses hydraulic transmission, making the transmission smoother and avoiding the impact of weights on the device when manually adding weights, thus making the test data of this device more accurate. When the set pressure is reached, the second solenoid valve 601 is closed, which utilizes the poor compressibility of the liquid to lock the pressure. After the loading phase is completed, the second solenoid valve 601 at the hydraulic loading chamber 302 closes, locking the volume of the hydraulic loading chamber 302. This ensures that the positive pressure of the clutch friction plate 7 on the friction sample disc 4 remains constant. At the same time, the first solenoid valve 60 at the hydraulic heating chamber 301 opens, and the piston continues to reciprocate, pushing the heat medium to circulate in the planar spiral heating tube 5, thus achieving the heating effect on the friction sample disc 4. By isolating the hydraulic heating chamber 301 from the hydraulic loading chamber 302, this device heats the friction sample disc 4 while maintaining a constant positive pressure. This makes the test variable singular, resulting in more accurate test results. The flowing high-temperature liquid can transfer heat to the friction sample disc 4 more evenly, reducing the occurrence of local overheating or heating dead zones, making the friction plate more evenly heated, and thus making the test results more reliable. The tester only needs to set the required pressure and temperature, and the device can complete the complex loading and heating process, reducing the dependence on the operator's experience and improving test efficiency.

[0019] Reference Figure 2 and Figure 3As shown, the loading lever assembly 6 includes a Y-shaped pressure rod 61, which is slidably connected to the constant speed friction testing machine body 1. The lower end of the Y-shaped pressure rod 61 is fixedly connected to the clutch friction plate 7, which is in close contact with the upper surface of the friction sample disc 4. A main lever 62 is rotatably connected to the constant speed friction testing machine body 1. The main lever 62 has a first sliding groove 63 and a second sliding groove 64. The upper end of the Y-shaped pressure rod 61 is slidably connected to the first sliding groove 63. When the main lever 62 deflects clockwise or counterclockwise by an angle, the upper end of the Y-shaped pressure rod 61 slides in the first sliding groove 63, causing the Y-shaped pressure rod 61 to move downward or upward, thereby driving the clutch friction plate 7 to move downward or upward synchronously, thus increasing or decreasing the pressure of the clutch friction plate 7 on the upper surface of the clutch friction plate 7.

[0020] Reference Figures 3-5 As shown, the drive assembly 9 includes a drive motor 91. When testing the clutch friction plate 7, the rotary motor 2 and the drive motor 91 are started first. The drive motor 91 is fixedly connected inside the protective cover 8. A bevel gear 92 is fixedly connected to the output end of the drive motor 91. When the drive motor 91 rotates, it drives the bevel gear 92 to rotate. A transmission shaft 93 is rotatably connected inside the protective cover 8. A gear 94 and a bevel gear 95 are fixedly connected to the transmission shaft 93. The bevel gear 95 meshes with the bevel gear 92. When the bevel gear 92 rotates, the meshing action causes the bevel gear 95 to rotate, thereby driving the transmission shaft 93 and the gear 94 to rotate synchronously.

[0021] Reference Figures 5-8 As shown, a connecting shaft 81 is fixedly connected inside the protective cover 8. The limiting disk assembly 10 includes a turntable 101, which is rotatably connected to the connecting shaft 81. A gear ring 102 is fixedly connected to the turntable 101, and the gear ring 102 meshes with a gear 94. When the drive motor 91 rotates, it drives the first bevel gear 92, the second bevel gear 95, the transmission shaft 93, and the gear 94 to rotate. Through the meshing action of the gear 94 and the gear ring 102, the gear ring 102 rotates, thereby driving the turntable 101 to rotate. A star-shaped groove 103 is provided on the turntable 101. When the turntable 101 rotates, the star-shaped groove 103 rotates synchronously.

[0022] Each of the several hydraulic heating piston assemblies 40 includes a piston rod 401, which is slidably connected to the hydraulic pipe 30. A circular slider 402 is fixedly connected to the piston rod 401 and is slidably connected within a star-shaped groove 103. As the star-shaped groove 103 rotates with the turntable 101, the circular slider 402 slides relative to the star-shaped groove 103. Under the limiting action of the star-shaped groove 103, the circular slider 402 drives the piston rod 401 to reciprocate within the hydraulic pipe 30. The piston rod 401 is fixedly connected to a hot-press piston 403. This arrangement allows the piston rod 401 to reciprocate within the hydraulic pipe 30, thereby driving the hot-press piston 403, which is fixedly connected to the piston rod 401, to reciprocate synchronously. When the circular slider 402 slides toward the recessed part of the star-shaped groove 103, the piston rod 401 drives the hot-press piston 403 to move in the opposite direction. When the circular slider 402 slides toward the protruding part of the star-shaped groove 103, the piston rod 401 drives the hot-press piston 403 to move in the forward direction.

[0023] Each of the several primary elastic loading piston assemblies 50 includes a loading piston 501, which is slidably connected to a piston rod 401. A hydraulic spring 502 is coaxially arranged with the piston rod 401. One end of the hydraulic spring 502 is fixedly connected to the loading piston 501, and the other end is fixedly connected to a hot-pressing piston 403. The hot-pressing piston 403, the loading piston 501, and the hydraulic pipe 30 form a hydraulic heating chamber 301. The loading piston 501 and the hydraulic pipe 30 form a hydraulic loading chamber 302. The hot-pressing piston 403 and the hydraulic pipe 30 form a vacuum chamber. When the first solenoid valve 60 at the corresponding position of the hydraulic heating chamber 301 is closed, the second solenoid valve 601 at the corresponding position of the hydraulic loading chamber 302 is opened, and the piston rod 401 drives the hot-pressing piston 403 in the hydraulic pipe... When the hydraulic loading chamber 301 moves forward or backward, it pushes or pulls the hydraulic spring 502 to move synchronously. This causes the hydraulic spring 502 to overcome the liquid resistance and push the loading piston 501 to move forward, thereby reducing the volume of the hydraulic loading chamber 302. The liquid in the hydraulic loading chamber 302 flows into the secondary elastic loading piston assembly 70 through the second solenoid valve 601 and the hose, causing the secondary elastic loading piston assembly 70 to extend upward. Through the transmission action, the main lever 62 deflects counterclockwise, which causes the Y-shaped pressure rod 61 to drive the clutch friction plate 7 to move upward, reducing the pressure of the clutch friction plate 7 on the friction sample plate 4. At the same time, the volume of the hydraulic heating chamber 301 remains unchanged, meaning that the liquid in the hydraulic heating chamber 301 cannot flow to the planar spiral heating tube 5 to heat the friction sample plate 4. When the pressure of the clutch friction plate 7 on the friction sample plate 4 reaches the value set by the tester, the first solenoid valve 60 at the corresponding position of the hydraulic heating chamber 301 opens, and the second solenoid valve 601 at the corresponding position of the hydraulic loading chamber 302 closes. Subsequently, as the star groove 103 rotates with the turntable 101, the loading piston 501 remains stationary, the volume of the hydraulic loading chamber 302 remains unchanged, and the hot-pressing piston 403 moves back and forth, causing the volume of the hydraulic heating chamber 301 to change continuously. This causes the high-temperature liquid in the hydraulic heating chamber 301 to enter the planar spiral heating tube 5 through the first solenoid valve 60, the annular tube 20, and the hose to heat the friction sample plate 4 before flowing back into the hydraulic heating chamber 301.

[0024] The annular tube 20 has an inlet 201 and an outlet 202. Both inlet 201 and outlet 202 are fixedly connected to a check valve 203. The check valves 203 at inlet 201 and outlet 202 are connected to both ends of the planar spiral heating tube 5 via two flexible hoses. When the pressure of the clutch friction plate 7 on the friction sample disc 4 reaches the value set by the tester, the first solenoid valve 60 at the corresponding position of the hydraulic heating chamber 301 opens, and the second solenoid valve 601 at the corresponding position of the hydraulic loading chamber 302 closes. When the piston rod 401 drives the hot-pressing piston 403 to move forward within the hydraulic tube 30, the high-temperature liquid in the hydraulic heating chamber 301 enters the annular tube 20 through the first solenoid valve 60 and then enters the planar spiral heating tube 5 through the outlet 202, check valve 203, and flexible hoses. The friction sample disk 4 is heated inside the spiral heating tube 5. When the piston rod 401 drives the hot-pressing piston 403 to move in the reverse direction inside the hydraulic tube 30, the liquid in the planar spiral heating tube 5 flows back to the hydraulic heating chamber 301 through the hose, one-way valve 203, liquid inlet 201, annular tube 20 and first solenoid valve 60. The secondary elastic loading piston assembly 70 includes a hydraulic chamber 701, which is fixedly connected to the top of the connecting shaft 81. The second solenoid valve 601 at the corresponding position of the hydraulic chamber 701 and the hydraulic loading chamber 302 are connected through the hose. This arrangement allows the volume of the hydraulic loading chamber 302 to decrease when the loading piston 501 moves in the forward direction. The liquid in the liquid loading chamber enters the hydraulic chamber 701 through the second solenoid valve 601 and the hose, thereby increasing the hydraulic pressure in the hydraulic chamber 701.

[0025] The secondary elastic loading piston assembly 70 also includes a booster piston 702, which is slidably connected within the hydraulic chamber 701. The liquid entering the hydraulic chamber 701 is located below the booster piston 702. As the hydraulic pressure in the hydraulic chamber 701 increases, the booster piston 702 moves upward. A loading spring 703 is installed within the hydraulic chamber 701. The upper end of the loading spring 703 is fixedly connected to the booster piston 702, and the lower end of the loading spring 703 is fixedly connected to the bottom of the hydraulic chamber 701. When the booster piston 702 moves upward, the loading spring 703 is stretched. A booster rod 704 is coaxially arranged with the booster piston 702. The lower end of the booster rod 704 is fixedly connected to the booster piston 702, and the upper end of the booster rod 704 is slidably connected to the second slide groove 64. When the booster piston 702 moves upward, it drives the booster rod 704 to move upward synchronously, causing the upper end of the booster rod 704 to slide in the second slide groove 64. At the same time, the main lever 62 deflects counterclockwise, causing the Y-shaped pressure rod 61 to drive the clutch friction plate 7 to move upward, reducing the normal pressure of the clutch friction plate 7 on the friction sample disc 4. When the loading piston 501 moves in the opposite direction, the volume of the hydraulic loading chamber 302 increases, and the hydraulic chamber 701 flows back into the liquid loading chamber. The booster piston 702 moves downward, and the elastic force of the loading spring 703 gradually decreases, thereby driving the booster rod 704 to move synchronously, causing the main lever 62 to deflect clockwise, which in turn causes the Y-shaped pressure rod 61 to drive the clutch friction plate 7 to move downward, increasing the normal pressure of the clutch friction plate 7 on the friction sample disc 4.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test device for detecting the friction performance of a clutch, characterized in that: The test chamber includes a constant-speed friction tester body (1), which is equipped with a rotating motor (2), a main shaft (3), a friction sample disc (4), a planar spiral heating tube (5), and a loading lever assembly (6). The loading lever assembly (6) is equipped with a clutch friction plate (7). A protective cover (8) is fixed on the constant-speed friction tester body (1). The protective cover (8) contains a drive assembly (9), a limit disc assembly (10), an annular tube (20), and several hydraulic tubes (30). A hydraulic heating piston assembly (40) and a primary elastic loading piston assembly (50) are slidably arranged in sequence in the hydraulic tubes (30). The component (40) and the primary elastic loading piston assembly (50) divide the inner cavity of the hydraulic pipe (30) into a vacuum chamber, a hydraulic heating chamber (301) and a hydraulic loading chamber (302). The drive assembly (9) is connected to the hydraulic heating piston assembly (40) via the limiting plate assembly (10). The hydraulic heating chamber (301) is connected to the planar spiral heating pipe (5) via the first solenoid valve (60) and the annular pipe (20) through a hose. The hydraulic loading chamber (302) is connected to the secondary elastic loading piston assembly (70) via the second solenoid valve (601). The secondary elastic loading piston assembly (70) is connected to the loading lever assembly (6).

2. The clutch friction performance testing device according to claim 1, characterized in that: The loading lever assembly (6) includes a Y-shaped pressure bar (61), which is slidably connected to the constant speed friction test machine body (1). The lower end of the Y-shaped pressure bar (61) is fixedly connected to the clutch friction plate (7), which is in close contact with the upper surface of the friction sample plate (4). A main lever (62) is rotatably connected to the constant speed friction test machine body (1). A first sliding groove (63) and a second sliding groove (64) are provided on the main lever (62). The upper end of the Y-shaped pressure bar (61) is slidably connected to the first sliding groove (63).

3. The clutch friction performance testing device according to claim 2, characterized in that: The drive assembly (9) includes a drive motor (91), which is fixedly connected inside the protective cover (8). A bevel gear (92) is fixedly connected to the output end of the drive motor (91). A transmission shaft (93) is rotatably connected inside the protective cover (8). A gear (94) and a bevel gear (95) are fixedly connected to the transmission shaft (93). The bevel gear (95) meshes with the bevel gear (92).

4. The clutch friction performance testing device according to claim 3, characterized in that: The protective cover (8) is fixedly connected to a connecting shaft (81). The limiting disk assembly (10) includes a turntable (101). The turntable (101) is rotatably connected to the connecting shaft (81). A toothed ring (102) is fixedly connected to the turntable (101). The toothed ring (102) meshes with a gear (94). A star-shaped groove (103) is provided on the turntable (101).

5. The clutch friction performance testing device according to claim 4, characterized in that: Each of the hydraulic heating piston assemblies (40) includes a piston rod (401), which is slidably connected to a hydraulic pipe (30). A circular slider (402) is fixedly connected to the piston rod (401), which is slidably connected in a star-shaped groove (103). A hot-press piston (403) is fixedly connected to the piston rod (401).

6. The clutch friction performance testing device according to claim 5, characterized in that: Each of the aforementioned primary elastic loading piston assemblies (50) includes a loading piston (501), which is slidably connected to a piston rod (401). A hydraulic spring (502) is coaxially arranged with the piston rod (401). One end of the hydraulic spring (502) is fixedly connected to the loading piston (501), and the other end of the hydraulic spring (502) is fixedly connected to a hot-pressing piston (403). The hot-pressing piston (403), the loading piston (501), and the hydraulic pipe (30) form a hydraulic heating chamber (301). The loading piston (501) and the hydraulic pipe (30) form a hydraulic loading chamber (302). The hot-pressing piston (403) and the hydraulic pipe (30) form a vacuum chamber.

7. The clutch friction performance testing device according to claim 6, characterized in that: The annular tube (20) is provided with an inlet (201) and an outlet (202). Both the inlet (201) and the outlet (202) are fixedly connected with a one-way valve (203). The one-way valves (203) at the inlet (201) and the outlet (202) are respectively connected to the two ends of the planar spiral heating tube (5) through two hoses. The secondary elastic loading piston assembly (70) includes a hydraulic chamber (701). The hydraulic chamber (701) is fixedly connected to the top of the connecting shaft (81). The second solenoid valve (601) at the corresponding position of the hydraulic chamber (701) and the hydraulic loading chamber (302) are connected through a hose.

8. The clutch friction performance testing device according to claim 7, characterized in that: The secondary elastic loading piston assembly (70) further includes a booster piston (702), which is slidably connected in a hydraulic chamber (701). A loading spring (703) is provided in the hydraulic chamber (701). The upper end of the loading spring (703) is fixedly connected to the booster piston (702), and the lower end of the loading spring (703) is fixedly connected to the bottom of the hydraulic chamber (701). A booster rod (704) is coaxially provided with the booster piston (702). The lower end of the booster rod (704) is fixedly connected to the booster piston (702), and the upper end of the booster rod (704) is slidably connected to the second slide groove (64).

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