Sine ripple type wet clutch friction characteristic and non-uniform transient temperature field measurement system and method

Abstract

The invention discloses a sine ripple type wet clutch friction characteristic and non-uniform transient temperature field measuring system and method, and belongs to the field of clutch friction pair temperature and friction characteristic testing, the system comprises a plurality of temperature sensors arranged on a dual steel sheet, and the plurality of temperature sensors are divided into three groups; the plurality of temperature sensors in the first group of temperature sensors are respectively arranged corresponding to the troughs of the dual steel sheet and are arranged at different radial positions of the troughs of the dual steel sheet; the plurality of temperature sensors in the second group of temperature sensors are respectively arranged corresponding to the wave crests of the dual steel sheet and are arranged at different radial positions of the wave crests of the dual steel sheet; and the plurality of temperature sensors in the third group of temperature sensors are circumferentially and uniformly arranged between adjacent wave crests and wave troughs on a certain radius of the dual steel sheet. According to the invention, friction performance such as torque transmission, dynamic and static friction coefficients and the like of a friction pair of various friction materials can be tested under the working conditions of different speeds, different specific pressures, different inertia configurations and the like.

Description

Technical Field

[0001] The invention belongs to the field of clutch friction pair temperature field and friction characteristic testing, and in particular relates to a sinusoidal corrugated wet clutch non-uniform transient temperature field and friction coefficient measurement method. Background Art

[0002] The sinusoidal corrugated friction pair has good separation characteristics, which allows the friction pair to work like a spring. When engaged, the contact area with the friction plate continues to increase, and the sinusoidal surface gradually becomes a plane. The biggest advantage is that when the friction pair is separated, it disengages smoothly like a spring, ensuring that there is no surface contact and excessive belt torque, successfully solving the interference phenomenon between the clutch and the brake caused by the difficulty in disengaging the friction pair.

[0003] However, the biggest problem with this special structure of friction pair is that it is not surface contact and sliding friction during engagement, but non-plane contact, which will cause excessive contact force and friction torque at local locations. At the same time, there is a large amount of friction heat loss in the engagement process of high-power wet friction pairs during continuous high-load stamping. The transient heat accumulation under high energy density input can easily lead to thermal failure phenomena such as ablation and peeling of friction materials, and significant and irreversible warping deformation of the dual steel sheets; at this time, the wet clutch friction pair will experience rapid temperature rise, torque mutation, and speed fluctuation, resulting in abnormal working performance or even failure, which manifests as functional failure. The wet friction pair is a consumable and wearable part, and thermal failure and functional failure directly lead to damage to the wet friction pair.

[0004] Therefore, there is an urgent need for a test system and a measurement method that can analyze the temperature distribution and change law on the surface of a sinusoidal corrugated friction pair under different working conditions. Summary of the invention

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A sinusoidal corrugated wet clutch friction characteristic and non-uniform transient temperature field measurement system, comprising a friction and wear tester, on which a dual steel sheet of the sinusoidal corrugated wet clutch is arranged for testing, wherein the dual steel sheet is a sinusoidal corrugated structure, and further comprising:

[0007] A plurality of temperature sensors are arranged on the dual steel sheets, and the plurality of temperature sensors are divided into three groups;

[0008] Wherein, a plurality of temperature sensors in the first group of temperature sensors are respectively arranged corresponding to the troughs of the dual steel sheets, and are installed at different radial positions of the troughs of the dual steel sheets to measure the temperatures at different radial positions of the troughs;

[0009] A plurality of temperature sensors in the second group of temperature sensors are respectively arranged corresponding to the wave crests of the dual steel sheets and are installed at different radial positions of the wave crests of the dual steel sheets to measure the temperatures at different radial positions of the wave crests;

[0010] A plurality of temperature sensors in the third group of temperature sensors are uniformly arranged circumferentially between adjacent wave crests and wave troughs on a certain radius of the pair of steel sheets to measure temperature changes of the pair of steel sheets between adjacent wave crests and wave troughs.

[0011] Furthermore, the temperature sensor is an armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensor.

[0012] Furthermore, the dual steel sheets are provided with 6 peaks and 6 troughs, the first group of temperature sensors and the second group of temperature sensors are 6 each, and the third group of temperature sensors is 6, among which 4 of the third group of temperature sensors are newly added temperature sensors, and the other 2 temperature sensors borrow 1 each from the first group of temperature sensors and the second group of temperature sensors.

[0013] Furthermore, multiple grooves of different depths are processed at different radial positions of the troughs of the dual steel sheets, and multiple grooves of different depths are processed at different radial positions of the crests of the dual steel sheets; multiple grooves of the same depth are processed between adjacent crests and troughs on a certain radius of the dual steel sheets; armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensors are installed in the grooves, and then the leads are fixed and led out.

[0014] Furthermore, the friction and wear testing machine is composed of a main body system, a power system, a control system and a test data acquisition system, wherein the plurality of temperature sensors are electrically connected to the test data acquisition system.

[0015] A method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch is a method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch as described in any one of the above items, and the measuring method comprises the following steps:

[0016] S10, installing the dual steel plate and friction plate of the sinusoidal ripple wet clutch to be tested on a friction and wear testing machine;

[0017] Among them, the friction and wear tester adopts the method of end face sliding of the circular ring test piece. The friction plate of the friction pair is installed in the rotating fixture disk, and the dual steel plate is installed in the static fixture disk and fixed circumferentially. The working oil passes through the main shaft from the inner diameter of the friction pair through the friction pair oil groove and flows out at the outer diameter;

[0018] S20, inserting a plurality of temperature sensors into the grooves of the dual steel sheets, fixing and leading out the leads, and electrically connecting them to the test data acquisition system;

[0019] S30. When conducting a simulated brake test, the simulated inertia should be configured first, the main motor should be started to rotate the friction plate driven by the main motor, and after reaching the set speed and stabilizing, the clutch fork cylinder should be started to disengage the main shaft from the main power of the motor, and at the same time, positive pressure should be applied to the cylinder to provide pressure for the friction pair, and the friction plate and the dual steel plate should be rubbed against each other by relying on the rotational inertia of the inertia plate until the friction plate brakes, so as to realize a brake test;

[0020] S40, during the braking process, the rotation speed of the friction plate is measured by a speed sensor, the pressure value between the friction pairs is measured by a pressure sensor, and the dynamic torque value generated is measured by a torque sensor. The friction coefficient of the friction pair at different relative sliding speeds during the relative sliding process can be calculated in real time based on the measurement values ​​of the above sensors;

[0021] Multiple temperature sensors are installed and arranged to measure the temperature value of each point of the friction pair to obtain the non-uniform distribution characteristics of the temperature field;

[0022] The test system uses a computer to output a switch signal to open or close the logic circuit to perform exchange control to complete the test of the instantaneous value, that is, to obtain the test data of any instantaneous value during the test process.

[0023] Furthermore, in step S40, the friction characteristics and non-uniform temperature field of the wet clutch friction pair are tested under different rotation speeds, different friction pair pressure ratios and different load inertia conditions.

[0024] Furthermore, the fitting process of the friction coefficient is as follows: the friction characteristics under different pressures, different inertias and different speeds are studied experimentally, and the variation law and calculation formula of the time-varying friction coefficient under different pressures, different speeds and different temperatures are obtained through data fitting.

[0025] Beneficial effects:

[0026] The present invention utilizes a test method of simulated braking to test the torque transmission of friction pairs and friction properties such as dynamic and static friction coefficients of various friction materials under working conditions such as different speeds, different pressure ratios and different inertia configurations, thereby realizing real-time monitoring of radial and circumferential non-uniform transient temperature fields of sinusoidal corrugated wet clutch friction pairs. The response speed is fast, and the requirements of measurement speed and accuracy are met. The measurement results are accurate and reliable, which plays a verification and guiding role in the design and improvement of sinusoidal corrugated wet clutch friction pairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the main structure of the friction and wear testing machine;

[0028] Figure 2 The layout diagram of the temperature sensor on the sinusoidal corrugated dual steel sheet;

[0029] Figure 3 It is a three-dimensional diagram of the arrangement of the temperature sensor on the sinusoidal corrugated dual steel sheet;

[0030] In the figure: 1. bed; 2. inertia plate; 3. clutch; 4. main shaft; 5. main shaft support; 6. friction plate; 7. dual steel plate; 8. cylinder support; 9. cylinder; 10. main motor. DETAILED DESCRIPTION

[0031] The present invention provides a system and method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch. The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings to make it easier to understand and grasp.

[0032] Example 1

[0033] refer to Figure 1 - Figure 3 A sinusoidal corrugated wet clutch friction characteristics and non-uniform transient temperature field measurement system includes a friction and wear tester, a dual steel sheet of the sinusoidal corrugated wet clutch is set on the friction and wear tester for testing, and the dual steel sheet is a sinusoidal corrugated structure. The measurement system also includes:

[0034] A plurality of temperature sensors are arranged on the dual steel sheets, and the plurality of temperature sensors are divided into three groups;

[0035] Wherein, a plurality of temperature sensors in the first group of temperature sensors are respectively arranged corresponding to the troughs of the dual steel sheets and are installed at different radial positions of the troughs of the dual steel sheets to measure the temperatures at different radial positions of the troughs;

[0036] The plurality of temperature sensors in the second group of temperature sensors are respectively arranged corresponding to the wave crests of the dual steel sheets and are installed at different radial positions of the wave crests of the dual steel sheets to measure the temperatures at different radial positions of the wave crests;

[0037] Multiple temperature sensors in the third group of temperature sensors are evenly arranged circumferentially between adjacent crests and troughs on a certain radius of the dual steel sheets to measure temperature changes of the dual steel sheets between adjacent crests and troughs.

[0038] In this embodiment, the temperature sensor is an armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensor.

[0039] In this embodiment, the dual steel sheets are provided with 6 peaks and 6 troughs, wherein the first group of temperature sensors and the second group of temperature sensors are 6 each, and the third group of temperature sensors is 6, wherein 4 of the third group of temperature sensors are newly added temperature sensors, and the other 2 temperature sensors borrow 1 each from the first group of temperature sensors and the second group of temperature sensors.

[0040] Among them, 6 grooves of different depths are processed at different radial positions of the troughs of the dual steel sheets, and 6 grooves of different depths are processed at different radial positions of the crests of the dual steel sheets; 4 grooves of the same depth are processed between adjacent crests and troughs on a certain radius of the dual steel sheets; armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensors are installed in all 16 grooves, and then the leads are fixed and led out.

[0041] Specifically, refer to Figure 2 The first group (TA1-TA6) represents the temperature measurement points at different radial positions of the six troughs, the second group (TB1-TB6) represents the temperature measurement points at different radial positions of the six peaks, and the third group (TA4, TC4, TD4, TE4, TF4, TB4) represents the temperature measurement points evenly arranged circumferentially between adjacent peaks and troughs on a certain radius (using the first group of temperature sensors TA4 and the second group of temperature sensors TB4).

[0042] In this embodiment, the friction and wear testing machine is composed of a main body system, a power system, a control system and a test data acquisition system, wherein 16 temperature sensors are all electrically connected to the test data acquisition system.

[0043] The present embodiment provides a sinusoidal corrugation type wet clutch friction characteristic and non-uniform transient temperature field measurement system, which can test the torque transmission of the friction pair and the friction performance such as the dynamic and static friction coefficient under various friction materials at different speeds, different pressure ratios and different inertia configurations, and realize real-time monitoring of the radial and circumferential non-uniform transient temperature fields of the sinusoidal corrugation type wet clutch friction pair, with fast response speed, meeting the requirements of measurement speed and accuracy, and the measurement results are accurate and reliable.

[0044] Example 2

[0045] A method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch is a method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch provided in Example 1.

[0046] The main motor 10 of the friction and wear testing machine used in this embodiment is installed on the bed 1, the axial first end of the clutch 3 is connected to the inertia disk 2 through the connecting shaft, the main shaft 4 is rotatably arranged on the main shaft support 5, the first end of the main shaft 4 is connected to the axial second end of the clutch 3, the second end of the main shaft 4 is connected to the clamping disk, the friction plate 6 is installed in the rotating clamping disk, the dual steel plate 7 is installed in the static clamping disk and fixed circumferentially, the cylinder 9 is installed on the cylinder support 8, the drive of the cylinder 9 is fixedly connected to the static clamping disk, and the cylinder 9 applies positive pressure to the dual steel plate 7, that is, provides pressure for the friction pair.

[0047] A method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal ripple wet clutch comprises the following steps:

[0048] S10, installing the dual steel plate 7 and friction plate 6 of the sinusoidal ripple type wet clutch to be tested on a friction and wear testing machine;

[0049] Among them, the friction and wear tester adopts the method of sliding friction on the end face of the circular ring test piece. The friction plate 6 of the friction pair is installed in the rotating fixture disk, and the dual steel plate 7 is installed in the static fixture disk and fixed circumferentially. The working oil passes through the main shaft from the inner diameter of the friction pair through the friction pair oil groove and flows out at the outer diameter;

[0050] S20, insert 16 temperature sensors into the slots of the dual steel sheet 7, fix and lead out the leads, and electrically connect them to the test data acquisition system;

[0051] S30, when conducting a simulated brake test, the simulated inertia should be configured first, the main motor 10 should be started to rotate the friction plate 6 driven by the main motor 10, and after reaching the set speed and being stable, the fork cylinder of the clutch 3 should be started to disengage the main shaft 4 from the main power of the main motor 10, and at the same time, positive pressure is applied to the cylinder 9 to provide pressure for the friction pair, and the friction plate 6 and the dual steel plate 7 are rubbed against each other by relying on the rotational inertia of the inertia plate 2 until the friction plate brakes, so as to realize a braking test;

[0052] S40, during the braking process, the rotation speed of the friction plate is measured by a speed sensor, the pressure value between the friction pairs is measured by a pressure sensor, and the dynamic torque value generated is measured by a torque sensor. The friction coefficient of the friction pair at different relative sliding speeds during the relative sliding process can be calculated in real time based on the measurement values ​​of the above sensors;

[0053] Multiple temperature sensors are installed and arranged to measure the temperature value of each point of the friction pair to obtain the non-uniform distribution characteristics of the temperature field;

[0054] The test system uses a computer to output a switch signal to open or close the logic circuit to perform exchange control to complete the test of the instantaneous value, that is, to obtain the test data of any instantaneous value during the test process.

[0055] In step S40, the friction characteristics and non-uniform temperature field of the wet clutch friction pair are tested under different rotation speeds, different friction pair pressure ratios and different load inertia conditions.

[0056] In this embodiment, the influence of temperature is not considered, and the friction coefficient changes with linear speed and pressure. The fitting process of the friction coefficient is: the friction characteristics under different pressures, different inertias, and different speeds are studied experimentally, and the change law and calculation formula of the time-varying friction coefficient under different pressures, different speeds and different temperatures are obtained through data fitting.

[0057] The method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugation type wet clutch provided in this embodiment can realize real-time monitoring of the radial and circumferential non-uniform transient temperature fields of the sinusoidal corrugation type wet clutch friction pair. It has a fast response speed and meets the requirements of measurement speed and accuracy. The measurement results are accurate and reliable, which plays a verification and guiding role in the design and improvement of the sinusoidal corrugation type wet clutch friction pair.

[0058] The above fully describes the technical solution of the present invention. It should be noted that the specific implementation of the present invention is not limited to the above description. All technical solutions formed by ordinary technicians in the field using equivalent or equivalent transformations in structure, method or function based on the spirit of the present invention fall within the protection scope of the present invention.

Claims

1. A sinusoidal corrugated wet clutch friction characteristics and non-uniform transient temperature field measurement system, comprising a friction and wear tester, on which a dual steel sheet of the sinusoidal corrugated wet clutch is set for testing, the dual steel sheet being a sinusoidal corrugated structure, characterized in that: Also includes: A plurality of temperature sensors are arranged on the dual steel sheets, and the plurality of temperature sensors are divided into three groups; Wherein, a plurality of temperature sensors in the first group of temperature sensors are respectively arranged corresponding to the troughs of the dual steel sheets, and are installed at different radial positions of the troughs of the dual steel sheets to measure the temperatures at different radial positions of the troughs; A plurality of temperature sensors in the second group of temperature sensors are respectively arranged corresponding to the wave crests of the dual steel sheets and are installed at different radial positions of the wave crests of the dual steel sheets to measure the temperatures at different radial positions of the wave crests; A plurality of temperature sensors in the third group of temperature sensors are uniformly arranged circumferentially between adjacent wave crests and wave troughs on a certain radius of the pair of steel sheets to measure temperature changes of the pair of steel sheets between adjacent wave crests and wave troughs.

2. The sinusoidal corrugated wet clutch friction characteristics and non-uniform transient temperature field measurement system according to claim 1 is characterized in that: The temperature sensor is an armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensor.

3. The sinusoidal ripple wet clutch friction characteristics and non-uniform transient temperature field measurement system according to claim 1, characterized in that: The dual steel sheets are provided with 6 peaks and 6 troughs, and the first group of temperature sensors and the second group of temperature sensors are both 6; the third group of temperature sensors is 6, among which 4 of the third group of temperature sensors are newly added temperature sensors, and the other 2 temperature sensors borrow 1 from each of the first group of temperature sensors and the second group of temperature sensors.

4. The sinusoidal corrugated wet clutch friction characteristics and non-uniform transient temperature field measurement system according to claim 1, characterized in that: A plurality of grooves of different depths are processed at different radial positions of the troughs of the dual steel sheets, and a plurality of grooves of different depths are processed at different radial positions of the crests of the dual steel sheets; a plurality of grooves of the same depth are processed between adjacent crests and troughs on a certain radius of the dual steel sheets; armored K-type nickel-chromium-nickel-silicon thermocouple temperature sensors are installed in the grooves, and then the leads are fixed and led out.

5. The sinusoidal ripple type wet clutch friction characteristics and non-uniform transient temperature field measurement system according to claim 1, characterized in that: The friction and wear testing machine is composed of a main body system, a power system, a control system and a test data acquisition system, wherein the plurality of temperature sensors are electrically connected to the test data acquisition system.

6. A method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch, characterized in that: The method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal ripple type wet clutch according to any one of claims 1 to 5 comprises the following steps: S10, installing the dual steel plate and friction plate of the sinusoidal ripple wet clutch to be tested on a friction and wear testing machine; Among them, the friction and wear tester adopts the method of end face sliding of the circular ring test piece. The friction plate of the friction pair is installed in the rotating fixture disk, and the dual steel plate is installed in the static fixture disk and fixed circumferentially. The working oil passes through the main shaft from the inner diameter of the friction pair through the friction pair oil groove and flows out at the outer diameter; S20, inserting a plurality of temperature sensors into the grooves of the dual steel sheets, fixing and leading out the leads, and electrically connecting them to the test data acquisition system; S30. When conducting a simulated brake test, the simulated inertia should be configured first, the main motor should be started to rotate the friction plate driven by the main motor, and after reaching the set speed and stabilizing, the clutch fork cylinder should be started to disengage the main shaft from the main power of the motor, and at the same time, positive pressure should be applied to the cylinder to provide pressure for the friction pair, and the friction plate and the dual steel plate should be rubbed against each other by relying on the rotational inertia of the inertia plate until the friction plate brakes, so as to realize a brake test; S40, during the braking process, the rotation speed of the friction plate is measured by a speed sensor, the pressure value between the friction pairs is measured by a pressure sensor, and the dynamic torque value generated is measured by a torque sensor. The friction coefficient of the friction pair at different relative sliding speeds during the relative sliding process can be calculated in real time based on the measurement values ​​of the above sensors; Multiple temperature sensors are installed and arranged to measure the temperature value of each point of the friction pair to obtain the non-uniform distribution characteristics of the temperature field in radial and circumferential directions; The test system uses a computer to output a switch signal to open or close the logic circuit to perform exchange control to complete the test of the instantaneous value, that is, to obtain the test data of any instantaneous value during the test process.

7. The method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch according to claim 6, characterized in that: In step S40, the friction characteristics and non-uniform temperature field of the wet clutch friction pair are tested under different rotation speeds, different friction pair pressure ratios and different load inertia conditions.

8. The method for measuring the friction characteristics and non-uniform transient temperature field of a sinusoidal corrugated wet clutch according to claim 6, characterized in that: The fitting process of the friction coefficient is as follows: the friction characteristics under different pressures, different inertias and different speeds are studied by experiments, and the variation law and calculation formula of the time-varying friction coefficient under different pressures, different speeds and different temperatures are obtained by data fitting.

Images