Wet-type multi-plate friction structure testing tool

Abstract

A wet-type multi-plate friction structure testing tool comprises a supporting seat, an input shaft and an output shaft, the input shaft and the output shaft are connected through a multi-plate friction assembly, and the multi-plate friction assembly comprises an inner end flange, a connecting shell, a spline housing and a piston friction plate set. The friction plate set is formed by alternately arranging steel plates in spline fit with the connecting shell and friction plates in spline fit with the spline housing, the spline housing is coaxially and fixedly connected with the output shaft, and the input shaft is provided with a pressure oil channel for guiding high-pressure oil into the connecting shell and a lubricating oil channel for guiding lubricating oil into the connecting shell. And the piston presses the friction plate group along with the entering of high-pressure oil so as to combine the input shaft and the output shaft into a whole. According to the utility model, two tests of the wet clutch and the brake are realized by one tool, verification test requirements of the wet clutch and the brake in the design and analysis process are met, a foundation is laid for product development, the development period is shortened, tests of different models of wet clutches and brakes can be realized, and the practicability is high.

Description

Technical Field

[0001] The utility model relates to a wet multi-plate friction structure testing tool, belonging to the technical field of wet clutch / brake testing. Background Art

[0002] Hydraulic transmission systems enable flexible shifting between gears and various functions primarily through the interaction of clutches. When the clutch is engaged, adjacent transmission components maintain the same motion state, allowing power to be transmitted to the next moving mechanism. When the clutch is disengaged, power is interrupted, and the adjacent moving components remain free. When the clutch's adjacent moving components are stationary, such as a housing, the clutch acts as a brake. When the brake is engaged, the friction material within the brake, acting as a stop against the adjacent moving components due to the stationary housing, stops the previously moving components, achieving braking and stopping while the vehicle is in motion. Due to their excellent control performance and heat dissipation, wet clutches / brakes are widely used in many tracked vehicles and construction machinery. Wet clutches / brakes consist of a piston assembly, seals, and friction plate packs. The friction plate pack is the core component, transmitting and disconnecting power through the engagement and disengagement of friction plates and steel plates. Its reliability directly determines the product's lifespan. The reliability of wet clutches and brakes is typically tested during the product validation phase, which can lead to repeated product validation, prolonged development cycles, and even failure. Utility Model Content

[0003] The wet multi-plate friction structure test fixture provided by the utility model realizes two tests of wet clutch and brake with one fixture, advances the performance evaluation of wet brake and wet clutch to the design and analysis stage of the product, meets the verification and testing requirements of wet clutch and brake during the design and analysis process, lays the foundation for product development, shortens the development cycle, and can realize testing of wet clutch and brake of different models by replacing different multi-plate friction plate groups, which is highly practical.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] The wet multi-plate friction structure test fixture comprises a support seat, an input shaft rotatably mounted on the support seat, and an output shaft rotatably mounted on the support seat and coaxially aligned with the input shaft, wherein the input shaft and the output shaft are connected via a multi-plate friction assembly, the multi-plate friction assembly comprising an inner end flange fixed to the inner end of the input shaft by bolts, a connecting shell fixed to the inner end flange by bolts, a spline sleeve rotatably connected to the connecting shell, a piston mounted in the connecting shell, and a friction plate group mounted in the connecting shell and abutting against the piston, the friction plate group being composed of steel plates splined with the connecting shell and friction plates splined with the spline sleeve alternately arranged, the spline sleeve being coaxially fixed with the output shaft, a pressure oil channel for introducing high-pressure oil into the connecting shell and a lubricating oil channel for introducing lubricating oil into the connecting shell being provided on the input shaft, and the piston pressing the friction plate group to combine the input shaft and the output shaft into a whole as the high-pressure oil enters.

[0006] Preferably, the outer end of the input shaft is fixed with an outer end flange, and the outer end flange is rotatably mounted on a column located on the side of the support seat. Positioning holes are provided on the outer end flange and the column. The outer end flange is circumferentially positioned on the column as the positioning pin is inserted into the positioning hole, and the inner end of the input shaft extends into the support seat.

[0007] Preferably, an oil inlet flange is mounted on the input shaft, and a high-pressure oil inlet hole connected to the pressure oil channel and a lubricating oil inlet hole connected to the lubricating oil channel are provided on the oil inlet flange. The pressure oil channel extends to the connecting shell and is connected to the inner cavity of the connecting shell.

[0008] Preferably, the lubricating oil passage extends to the inner end flange and is connected to the inner cavity of the spline sleeve, and the spline sleeve is provided with an oil hole connected to the connecting shell.

[0009] Preferably, the outer end and the inner end of the output shaft are both fixedly connected to flanges, and the inner end of the input shaft extends into the support seat and is coaxially fixed to the spline sleeve through the shaft sleeve.

[0010] Preferably, the support seat is in the shape of an upwardly open oil pool, and the multi-piece friction assembly is located in the support seat.

[0011] The beneficial effects of the utility model are:

[0012] The utility model discloses a wet multi-plate friction structure test fixture, wherein the input shaft and the output shaft are connected by a multi-plate friction assembly, the inner end flange and the connecting shell of the multi-plate friction assembly are fixed to the input shaft, the spline sleeve is fixed to the output shaft, the spline sleeve is rotatably connected to the connecting shell, the steel plates in the friction plate group are splined with the connecting shell, and the friction plates are splined with the spline sleeve. When the high-pressure oil does not enter the connecting shell, the lubricating oil entering the connecting shell lubricates the friction plates and the steel plates, and the friction plate group is in a free state and does not generate friction, and the input shaft and the output shaft can only rotate relative to each other; when performing a brake test, the input shaft is first locked to restrict its rotation, and the output shaft is rotated, and then the high-pressure oil is introduced from the pressure oil channel into the connecting shell to push the piston to move toward the friction plate group, and the friction plate group is pressed, so that the input shaft and the output shaft are combined into a whole, thereby forming a brake on the output shaft, simulating the braking process of a wet brake, and when performing a clutch test, the input shaft and the output shaft are first rotated at different speeds, High-pressure oil is then introduced from the pressure oil channel into the connecting housing to push the piston toward the friction plate group, compressing the friction plate group and combining the input shaft and the output shaft into a whole, forming the input shaft and the output shaft to rotate at the same speed, simulating the clutch engagement process; the changes in the torque and speed of the input shaft and / or the output shaft during the compression of the friction plate group are tested, and the influence of the input oil pressure of the pressure oil channel and the input oil volume of the lubricating oil channel on the torque and speed of the output shaft and / or the input shaft, as well as the wear of the friction plate and the steel plate during the test cycle are detected, so that one tool can perform two tests on the wet clutch and brake, and the performance evaluation of the wet brake and wet clutch is advanced to the design and analysis stage of the product, meeting the verification test requirements of the wet clutch and brake during the design and analysis process, laying the foundation for product development, shortening the development cycle, and by replacing multiple friction plate groups that are not smooth, different models of wet clutches and brakes can be tested, which is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of a wet multi-plate friction structure test fixture in a specific implementation manner.

[0014] Figure 2 for Figure 1 A partial enlarged schematic diagram. DETAILED DESCRIPTION

[0015] The following combination Figures 1 and 2 The embodiments of the present utility model are described in detail.

[0016] The wet multi-plate friction structure test fixture includes a support base 1, an input shaft 2 rotatably mounted on the support base 1, and an output shaft 3 rotatably mounted on the support base 1 and coaxially aligned with the input shaft 2, characterized in that: the input shaft 2 and the output shaft 3 are connected by a multi-plate friction assembly 4, the multi-plate friction assembly 4 includes an inner end flange 5 fixed to the inner end of the input shaft 2 by bolts, a connecting shell 6 fixed to the inner end flange 5 by bolts, a spline sleeve 7 rotatably connected to the connecting shell 6, a piston 8 mounted in the connecting shell 6, and a friction plate group 9 mounted in the connecting shell 6 and abutting against the piston 8. The friction plate group 9 is composed of steel plates splined with the connecting shell 6 and friction plates splined with the spline sleeve 7, which are alternately arranged. The spline sleeve 7 is coaxially fixed to the output shaft 3. A pressure oil channel 21 for introducing high-pressure oil into the connecting shell and a lubricating oil channel 22 for introducing lubricating oil into the connecting shell 6 are provided on the input shaft 2. As the high-pressure oil enters, the piston 8 presses the friction plate group 9 to combine the input shaft 2 and the output shaft 3 into a whole.

[0017] The wet multi-plate friction structure test fixture described above has the input shaft 2 and the output shaft 3 connected by a multi-plate friction assembly 4. The inner end flange 5 and the connecting shell 6 in the multi-plate friction assembly 4 are fixed to the input shaft 2, the spline sleeve 4 is fixed to the output shaft 3, and the spline sleeve 7 is rotatably connected to the connecting shell 6. The steel plates in the friction plate group 6 are spline-matched with the connecting shell 6, and the friction plates are spline-matched with the spline sleeve 7. When no high-pressure oil enters the connecting shell, the lubricating oil entering the connecting shell 6 lubricates the friction plates and the steel plates, and the friction plate group 9 is in a free state and does not generate friction. The input shaft 2 and the output shaft 3 can only rotate relative to each other; when performing a braking test, the input shaft 2 is first locked to restrict its rotation, and the output shaft 3 is rotated. Then, high-pressure oil is introduced from the pressure oil channel 21 into the connecting shell 6 to push the piston 8 toward the friction plate group 9, pressing the friction plate group, so that the input shaft 2 and the output shaft 3 are combined into a whole, forming a brake on the output shaft 3, simulating the braking process of a wet brake, and when performing a clutch test, the input shaft 2 and the output shaft 3 are firstly locked at different The input shaft 2 and the output shaft 3 are connected at the same speed, and the input shaft 2 and the output shaft 3 are connected at the same speed to simulate the clutch engagement process. The changes in the torque and speed of the input shaft 2 and / or the output shaft 3 during the compression of the friction plate group 9 are tested, and the effects of the input oil pressure of the pressure oil channel 21 and the input oil volume of the lubricating oil channel 22 on the torque and speed of the output shaft 3 and / or the input shaft 2 are detected, as well as the wear of the friction plates and steel plates during the test cycle are detected. This enables one tool to perform two tests on the wet clutch and brake, bringing the performance evaluation of the wet brake and wet clutch forward to the design and analysis stage of the product, meeting the verification test requirements of the wet clutch and brake during the design and analysis process, laying the foundation for product development, shortening the development cycle, and by replacing multiple friction plate groups 9 that are not compatible, different models of wet clutches and brakes can be tested, which is highly practical.

[0018] The outer end of the input shaft 2 is fixed to an outer flange 10, which is rotatably mounted on a column 11 located on the side of the support base 1. Both the outer flange 10 and the column 11 have positioning holes A. The outer flange 10 is circumferentially positioned on the column 11 by the insertion of a positioning pin into the positioning hole A. The inner end of the input shaft 2 extends into the support base 1. The outer flange 10 is rotatable on the support base 1. During wet clutch testing, both the input shaft 2 and the input shaft 3 must rotate, while during wet brake testing, the input shaft 2 is locked and cannot rotate. Inserting the positioning pin into the positioning hole A locks the input shaft 2, preventing it from rotating. This simplifies the switching between wet clutch and brake testing.

[0019] The input shaft 2 is provided with an oil inlet flange 12, which is provided with a high-pressure oil inlet hole B connected to a pressure oil passage 21 and a lubricating oil inlet hole C connected to a lubricating oil passage 22. The pressure oil passage 21 extends to the connecting housing 6 and is connected to the inner cavity of the connecting housing 6. Figure 2 It can be seen that the pressure oil channel 21 is connected to the piston cavity formed between the connecting shell 6 and the piston 8, and the high-pressure oil inlet hole B is connected to the high-pressure oil pump. The high-pressure oil enters from the high-pressure oil inlet hole B and enters the inner cavity of the connecting shell 6 through the pressure oil channel 21, pushing the piston 8 toward the friction plate group 9 to press it.

[0020] The lubricating oil passage 22 extends to the inner flange 5 and communicates with the inner cavity of the splined sleeve 7. The splined sleeve 7 has an oil hole 71 that communicates with the connecting housing 6. The lubricating oil inlet hole C is connected to a lubricating oil pipe. Lubricating oil flows from the lubricating oil inlet hole C through the lubricating oil passage 22 into the inner cavity of the inner flange 5 and the splined sleeve 7, and then enters the inner cavity of the connecting housing 6 through the oil hole 71 to lubricate the friction plate pack 9.

[0021] The outer and inner ends of the output shaft 3 are both fixed to connecting flanges 13. The inner end of the input shaft 3 extends into the support seat and is coaxially fixed to the spline sleeve 7 via a sleeve 14. The spline sleeve 7 is rotatably connected to the connecting housing 6, which is fixed to the input shaft 2, allowing the spline sleeve 7 to rotate relative to the input shaft 2. The spline sleeve 7 is fixed to the connecting flange at the inner end of the input shaft 3 via the sleeve 14. A friction plate pack 9 is mounted between the spline sleeve 7 and the connecting housing 6. When the friction plate pack 9 is not compressed, the input shaft 2 and the output shaft 3 can rotate relative to each other. When the friction plate pack 9 is compressed, the input shaft 2 and the output shaft 3 are connected as a whole and cannot rotate relative to each other, but can only rotate synchronously.

[0022] The support base 1 is in the shape of an upwardly open oil pool, and the multi-plate friction assembly 4 is located in the support base 1. The support base 2 receives the oil falling from the multi-plate friction assembly 4, forming a centralized collection of the oil for recycling.

[0023] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the embodiments described are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

Claims

1. A wet multi-plate friction structure test fixture comprising a support base, an input shaft rotatably mounted on the support base, and an output shaft rotatably mounted on the support base and coaxially aligned with the input shaft, characterized in that: The input shaft and the output shaft are connected by a multi-plate friction assembly, which includes an inner end flange fixed to the inner end of the input shaft by bolts, a connecting shell fixed to the inner end flange by bolts, a spline sleeve rotatably connected to the connecting shell, a piston installed in the connecting shell, and a friction plate group installed in the connecting shell and abutting the piston. The friction plate group is composed of steel plates splined with the connecting shell and friction plates splined with the spline sleeve, which are alternately arranged. The spline sleeve is coaxially fixed to the output shaft. A pressure oil channel for introducing high-pressure oil into the connecting shell and a lubricating oil channel for introducing lubricating oil into the connecting shell are provided on the input shaft. As the high-pressure oil enters, the piston presses the friction plate group to combine the input shaft and the output shaft into a whole.

2. The wet multi-plate friction structure test fixture according to claim 1, characterized in that: The outer end of the input shaft is fixed with an outer end flange, which is rotatably mounted on a column located on the side of the support seat. Positioning holes are provided on the outer end flange and the column. The outer end flange is circumferentially positioned on the column as the positioning pin is inserted into the positioning hole, and the inner end of the input shaft extends into the support seat.

3. The wet multi-plate friction structure test fixture according to claim 2, characterized in that: The input shaft is provided with an oil inlet flange, which is provided with a high-pressure oil inlet hole connected to the pressure oil channel and a lubricating oil inlet hole connected to the lubricating oil channel. The pressure oil channel extends to the connecting shell and is connected to the inner cavity of the connecting shell.

4. The wet multi-plate friction structure test fixture according to claim 3, characterized in that: The lubricating oil passage extends to the inner end flange and is connected to the inner cavity of the spline sleeve. The spline sleeve is provided with an oil hole connected to the connecting shell.

5. The wet multi-plate friction structure testing tool according to claim 2, characterized in that: The outer end and the inner end of the output shaft are both fixedly connected to the flange, and the inner end of the input shaft extends into the support seat and is coaxially fixed with the spline sleeve through the shaft sleeve.

6. The wet multi-plate friction structure test fixture according to claim 1, characterized in that: The support seat is in the shape of an upwardly open oil pool, and the multi-piece friction assembly is located in the support seat.

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