Transmission part active lubrication flow test method and test model

Abstract

According to the transmission part active lubrication flow testing method, the problems that a testing method in the prior art is low in testing efficiency and insufficient in testing accuracy are solved, the method for calculating the active lubrication flow by measuring the mass of the lubricating oil within the fixed time through the weighing device is provided, the loss of the lubricating oil is avoided, and the actual working condition is met; and the test accuracy is improved while the test efficiency is improved. Besides, the flow data with high accuracy obtained through oil mass calculation can be used for optimization of an existing simulation test model, the simulation model is corrected and optimized through test data, and the optimized simulation model can improve the test efficiency and enrich the test working conditions and has a synergistic effect. The device is simple in structure, good in repeatability and high in automation degree, and can quickly and fully verify the active lubrication capability of the single part of the transmission in the early stage of product development, thereby avoiding abnormal wear of local parts caused by insufficient lubrication cooling capability during operation of the transmission.

Description

Technical Field

[0001] The invention belongs to the field of transmission component testing, and in particular relates to a transmission component active lubrication flow testing method and a testing model. Background Art

[0002] In the normal operation of the transmission, lubricating oil not only reduces the friction coefficient and plays a role in lubrication, but also has an important cooling function. For transmissions, especially automatic transmissions with hydraulic transmission, most of them adopt active lubrication, using built-in oil pumps to spray lubricating oil through oil channels or oil pipes to the positions that need lubrication and cooling. The types of parts include shafts, housings, and supports. The design of the internal lubricating oil channels and the size of the terminal damping holes directly affect the distribution and flow of oil in the lubricating parts. If the lubricating flow at the lubricating parts does not meet the design requirements, it will cause abnormal wear of the parts or excessive temperature rise, thereby affecting the normal operation of the transmission.

[0003] The test methods commonly used for lubrication flow in the prior art are usually the unit time volume measurement method or the external pipeline flow test method. However, both methods have drawbacks in actual testing. Although the volume measurement method is simple to operate, when the inlet flow rate is large in the test condition, the oil loss caused by splashing is large. At the same time, due to the low degree of automation of the volume measurement method, the test efficiency is low, the measurement result has large deviation and poor repeatability. Although the external pipeline flow test method obtains the flow result through the electronic sensor and has good repeatability, the external pipeline increases the impedance of the oil channel to a certain extent, which is inconsistent with the actual operating conditions. In addition, it is difficult to connect the oil pipe to the open hole oil channel on the shaft parts and the gap oil channel on the clutch support parts. In general, these two test methods have low test efficiency and insufficient test accuracy.

[0004] With the development of computer technology, the use of CAE technology to simulate the lubrication flow of hydraulic lubrication systems has gradually become an analytical method. However, due to the complexity of the lubrication oil channel layout on the transmission and the uncertainty parameter factors of components such as the clutch and rotating seal, the application scope of the simulation model is limited. In addition, when the actual active lubrication flow data is not accurate enough, it is difficult to verify and support the model, which also leads to insufficient reliability of the model. Summary of the invention

[0005] The purpose of the present invention is to provide a method and a test model for testing the active lubrication flow of transmission components, so as to solve the problems of low test efficiency and insufficient test accuracy in the prior art when measuring the active lubrication flow, as well as insufficient reliability of the existing test model.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A method for testing the active lubrication flow of transmission parts, comprising an active lubrication test system for testing the parts to be tested of the transmission; the active lubrication test system comprises a main oil tank, a hydraulic adjustment device, a temperature control circulation device, an oil collecting device, and a weighing device; the main oil tank is used to store lubricating oil; the main oil tank outputs lubricating oil to the sample to be tested through its own oil supply port; the oil collecting device is used to collect the lubricating oil flowing out of the sample to be tested; the weighing device is used to weigh the lubricating oil in the oil collecting device; the hydraulic adjustment device and the temperature control circulation device are both arranged inside the main oil tank, and are respectively used to adjust the temperature, flow and pressure of the lubricating oil output by the main oil tank; the oil supply port of the main oil tank is provided with a pressure sensor, a flow sensor and a temperature sensor, comprising the following steps:

[0008] Step 1, starting the active lubrication test system until the actual pressure, flow rate and temperature of the oil supply port of the test sample connected to the active lubrication test system reach the target set values;

[0009] Step 2, collecting lubricating oil using an oil collecting device of an active lubrication test system;

[0010] Step 3, repeatedly calculating the mass of the lubricating oil in the oil collecting device per unit time until the value tends to be stable, and recording the mass of the lubricating oil in the oil collecting device at the current moment;

[0011] Step 4, wait for a period of time, weigh the mass of the lubricating oil in the oil collecting device, record the time of this weighing and the corresponding mass of the lubricating oil; calculate the flow rate of this active lubrication test system according to the mass of the lubricating oil increased during this period of time;

[0012] Step 5, use the method of step 4 to calculate the active lubrication flow of the sample to be tested multiple times to obtain multiple sets of active lubrication flow data, take the average value of the flow data of the multiple sets of active lubrication test systems as the final active lubrication flow result under the current working conditions, and complete the test of the active lubrication flow of the transmission components.

[0013] The present invention also has the following features:

[0014] Furthermore, in step 3, after calculating the increased mass of the lubricating oil in the oil collecting device per unit time for multiple times, when the difference between three consecutive calculated values ​​does not exceed 5%, it is considered to be stable.

[0015] Furthermore, in step 3, the current time is denoted as t 0 , t 0 The mass of lubricating oil in the oil collecting device at the time is recorded as w 0 ;

[0016] In step 4, the waiting time is recorded as t 1 , the corresponding lubricating oil mass is denoted as w 1 , use the following formula to calculate the flow rate of this active lubrication test system:

[0017]

[0018] Among them, ρ T Indicates the density of the lubricating oil at the set temperature;

[0019] g represents the acceleration due to gravity;

[0020] Q 1 Indicates the flow rate of this active lubrication test system;

[0021] In step 5, calculate the flow rate for the active lubrication test system using the following formula:

[0022]

[0023] Where n represents the total number of times the flow rate of the active lubrication test system is calculated;

[0024] Q 1 To Q n represents the flow rate of the active lubrication test system calculated for the first time to the flow rate of the active lubrication test system calculated for the nth time in sequence;

[0025] Represents the flow rate of the active lubrication test system.

[0026] Furthermore, in step 5, the flow rate of the active lubrication test system is calculated again at least twice using the method of step 4, so as to obtain flow rate data of at least three active lubrication test systems in total.

[0027] A test model of an active lubrication test system based on a transmission, wherein the test model of the active lubrication test system is optimized based on active lubrication flow data measured by the above-mentioned transmission component active lubrication flow test method.

[0028] Furthermore, it includes an oil pump model, an oil channel model, a centrifugal force model, a bearing model and a clutch model.

[0029] Furthermore, the test model of the transmission-based active lubrication test system is built using AMEsim.

[0030] Compared with the prior art, the present invention has the following technical effects:

[0031] The active lubrication flow testing method for transmission parts of the present invention addresses the problems of low testing efficiency and insufficient testing accuracy of the testing methods in the prior art. A method for calculating the active lubrication flow rate is proposed by measuring the mass of the lubricating oil within a fixed time by a weighing device. This method does not require an external pipeline, avoids the loss of lubricating oil, and conforms to actual working conditions. It improves the test efficiency while increasing the test accuracy.

[0032] In addition, the flow data with high accuracy obtained by calculating the oil mass can be used to optimize the existing simulation test model. The test data is used to correct and optimize the simulation model. The optimized simulation model can improve the test efficiency and enrich the test conditions, which has a synergistic effect. The test method in the present invention can effectively improve the test accuracy, and has good repeatability and high automation. It can quickly and fully verify the active lubrication ability of the transmission component monomer in the early stage of product development, thereby avoiding abnormal wear of local parts due to insufficient lubrication and cooling capacity during the operation of the transmission, which is suitable for large-scale industrial use and promotion. DETAILED DESCRIPTION

[0033] It should be noted that all components in the present invention, unless otherwise specified, are components known in the prior art, such as the hydraulic adjustment device, temperature control circulation device, oil collection device and weighing device, which are all existing devices in the existing active lubrication test system.

[0034] All methods in the present invention, unless otherwise specified, all adopt methods known in the prior art. For example, the oil pump model, oil channel model, centrifugal force model, bearing model and clutch model and the methods for establishing the above models all adopt known methods. The optimization of the above models also belongs to the known content in the prior art.

[0035] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0036] A method for testing the active lubrication flow rate of transmission parts. The following describes the use scenario of the active lubrication test system:

[0037] Active lubrication test system is applied to the active lubrication test system of the transmission; the active test lubrication system includes a main oil tank, a hydraulic adjustment device, a temperature control circulation device, an oil collection device, and a weighing device;

[0038] Among them, the main oil tank is used to store lubricating oil;

[0039] The main oil tank is connected to an oil pump according to conventional selection, and outputs lubricating oil to the sample to be tested through its own oil supply port;

[0040] The oil collecting device is used to collect the lubricating oil flowing out from the sample to be tested;

[0041] The weighing device is used to weigh the lubricating oil in the oil collecting device;

[0042] The hydraulic adjustment device and the temperature control circulation device are both arranged inside the main oil tank, and are used to adjust the temperature and pressure of the lubricating oil output from the main oil tank respectively;

[0043] Pressure sensors, flow sensors and temperature sensors are provided at the oil supply ports of the main oil tank.

[0044] The lubricating oil in the main oil tank enters the sample to be tested through the temperature control circulation device and the hydraulic adjustment device, and the lubricating oil flowing out of the sample to be tested enters the oil collecting module. The oil collecting module is connected with the oil tank so that the lubricating oil returns to the oil tank, forming a closed cycle of the oil circuit;

[0045] The test conditions include the lubrication pressure, lubrication flow and temperature of the input oil port when the sample to be tested is running in the gearbox. The information data of the test conditions are respectively input into the hydraulic adjustment device and the temperature control circulation device for real simulation of the operating environment; the sensor of the weighing module is connected to the oil collecting module to obtain the weight information of the lubricating oil in the oil collecting module. Finally, the active lubrication flow test result can be obtained after data processing.

[0046] The specific steps include:

[0047] A method for testing the active lubrication flow of transmission parts includes an active lubrication test system for testing the parts to be tested of the transmission; the active lubrication test system includes a main oil tank, a hydraulic adjustment device, a temperature control circulation device, an oil collecting device, and a weighing device; the main oil tank is used to store lubricating oil; the main oil tank outputs lubricating oil to the sample to be tested through its own oil supply port; the oil collecting device is used to collect the lubricating oil flowing out of the sample to be tested; the weighing device is used to weigh the lubricating oil in the oil collecting device; the hydraulic adjustment device and the temperature control circulation device are both arranged inside the main oil tank, and are respectively used to adjust the temperature, flow and pressure of the lubricating oil output from the main oil tank; a pressure sensor, a flow sensor and a temperature sensor are all arranged at the oil supply port of the main oil tank, including the following steps:

[0048] Step 1, starting the active lubrication test system until the actual pressure, flow rate and temperature of the oil supply port of the test sample connected to the active lubrication test system reach the target set values;

[0049] Step 2, collecting lubricating oil using an oil collecting device of an active lubrication test system;

[0050] Step 3, repeatedly calculating the mass of the lubricating oil in the oil collecting device per unit time until the value tends to be stable, and recording the mass of the lubricating oil in the oil collecting device at the current moment;

[0051] Step 4, wait for a period of time, weigh the mass of the lubricating oil in the oil collecting device, record the time of this weighing and the corresponding mass of the lubricating oil; calculate the flow rate of this active lubrication test system according to the mass of the lubricating oil increased during this period of time;

[0052] Step 5: Use the method in step 4 to calculate the active lubrication flow of the sample to be tested multiple times to obtain multiple sets of active lubrication flow data, and take the average of the flow data of multiple sets of active lubrication test systems as the final active lubrication flow result under the current working condition to complete the test of the active lubrication flow of the transmission parts.

[0053] If the part to be tested has multiple lubricating oil outlets and cannot be fully tested at one time, multiple tests can be performed, keeping the operating parameters unchanged, changing the oil collecting device to the corresponding position, and repeating the above operations to test. If the test conditions are changed, the relevant operating parameters can be changed and the above operations can be repeated to test.

[0054] The active lubrication flow testing method for transmission parts of the present invention addresses the problems of low testing efficiency and insufficient testing accuracy of the testing methods in the prior art. A method for calculating the active lubrication flow rate is proposed by measuring the mass of the lubricating oil within a fixed time by a weighing device. This method does not require an external pipeline, avoids the loss of lubricating oil, and conforms to actual working conditions. It improves the test efficiency while increasing the test accuracy.

[0055] As a preferred solution, in step 3, after calculating the increased mass of the lubricating oil in the oil collecting device per unit time for multiple times, when the difference between three consecutive calculated values ​​does not exceed 5%, it is considered to be stable.

[0056] Specifically, in step 3, the current time is recorded as t 0 , t 0 The mass of lubricating oil in the oil collecting device at the time is recorded as w 0 ;

[0057] In step 4, the waiting time is recorded as t 1 , the corresponding lubricating oil mass is denoted as w 1 , use the following formula to calculate the flow rate of this active lubrication test system:

[0058]

[0059] Among them, ρ T Indicates the density of the lubricating oil at the set temperature;

[0060] g represents the acceleration due to gravity;

[0061] Q 1 Indicates the flow rate of this active lubrication test system;

[0062] In step 5, calculate the flow rate for the active lubrication test system using the following formula:

[0063]

[0064] Where n represents the total number of times the flow rate of the active lubrication test system is calculated;

[0065] Q 1 To Q n represents the flow rate of the active lubrication test system calculated for the first time to the flow rate of the active lubrication test system calculated for the nth time in sequence;

[0066] Represents the flow rate of the active lubrication test system.

[0067] Specifically, in step 5, the flow rate of the active lubrication test system is calculated again at least twice using the method of step 4, and flow rate data of at least three active lubrication test systems are obtained in total.

[0068] A test model of an active lubrication test system based on a transmission, wherein the test model of the active lubrication test system is optimized based on active lubrication flow data measured by the above-mentioned transmission component active lubrication flow test method.

[0069] Furthermore, the test model of the active lubrication test system based on the transmission includes an oil pump model, an oil channel model, a centrifugal force model, a bearing model and a clutch model. The establishment of the above models and the relationship between the models are all known contents in the prior art, and those skilled in the art can select an existing test model or build a required model according to actual needs.

[0070] Furthermore, the test model of the transmission-based active lubrication test system was built using AMEsim.

[0071] A simulation model of the sample to be tested or the gearbox lubrication system is built using the system modeling and simulation software AMESim, and the same working conditions as in step 1 of this embodiment are set for loading calculation. By comparing with the final test results, the model parameters are modified to perform repeated iterative calculations until the error is within an acceptable range. The model is then used to continue testing and verifying under more extreme conditions or repeated conditions as a data reference.

[0072] The skilled person in the art can modify the variable parameters in the model by comparing the flow results of the active lubrication test system in a conventional manner, including but not limited to the local loss coefficient of the pipeline at branches, variable diameters, bends, etc., the centrifugal force coefficient, the bearing model flow, and the throttle flow;

[0073] Technical personnel in this field modify the variable parameters in the model based on actual needs and in combination with known methods, and iterate and simulate the model until the error between the simulation result and the test data is reduced to an acceptable range, thereby completing the optimization of the model. As the number of benchmark test conditions for the model increases, its reliability will increase.

[0074] The flow data with high accuracy obtained by calculating the oil mass can be used to optimize the existing simulation test model. The simulation model can be corrected and optimized using the test data. The optimized simulation model can improve the test efficiency and enrich the test conditions. The test method in the present invention can effectively improve the test accuracy, and has good repeatability and high automation. It can quickly and fully verify the active lubrication ability of the transmission component monomer in the early stage of product development, thereby avoiding abnormal wear of local parts due to insufficient lubrication and cooling capacity during the operation of the transmission.

[0075] By using the corrected and optimized simulation model, the number of tests under actual working conditions can be appropriately reduced. By using the simulation data results as a reference, the test time can be reduced and the test efficiency can be improved. For the extreme working conditions that cannot be reached by the actual test system, the test conditions can be enriched by using simulation methods. The method of this embodiment is applied to the existing simulation model, which provides a basis for optimizing the existing model and has a synergistic effect.

Claims

1. A method for testing the active lubrication flow rate of transmission components, comprising an active lubrication test system for testing the components to be tested of the transmission; the active lubrication test system comprises a main oil tank, a hydraulic adjustment device, a temperature control circulation device, an oil collection device, and a weighing device; The main oil tank is used to store lubricating oil; the main oil tank outputs lubricating oil to the sample to be tested through its own oil supply port; the oil collecting device is used to collect the lubricating oil flowing out of the sample to be tested; the weighing device is used to weigh the lubricating oil in the oil collecting device; the hydraulic regulating device and the temperature control circulation device are both arranged inside the main oil tank, and are respectively used to adjust the temperature, flow rate and pressure of the lubricating oil output from the main oil tank; the oil supply port of the main oil tank is provided with a pressure sensor, a flow rate sensor and a temperature sensor, and is characterized in that it includes the following steps: Step 1, starting the active lubrication test system until the actual pressure, flow rate and temperature of the oil supply port of the test sample connected to the active lubrication test system reach the target set values; Step 2, collecting lubricating oil using an oil collecting device of an active lubrication test system; Step 3, repeatedly calculating the mass of the lubricating oil in the oil collecting device per unit time until the value tends to be stable, and recording the mass of the lubricating oil in the oil collecting device at the current moment; Step 4, wait for a period of time, weigh the mass of the lubricating oil in the oil collecting device, record the time of this weighing and the corresponding mass of the lubricating oil; calculate the flow rate of this active lubrication test system according to the mass of the lubricating oil increased during this period of time; Step 5, use the method of step 4 to calculate the active lubrication flow of the sample to be tested multiple times to obtain multiple sets of active lubrication flow data, take the average value of the flow data of the multiple sets of active lubrication test systems as the final active lubrication flow result under the current working conditions, and complete the test of the active lubrication flow of the transmission components.

2. The transmission component active lubrication flow rate testing method according to claim 1, characterized in that: In step 3, when the difference between three consecutive calculated values ​​does not exceed 5%, it is considered to be stable.

3. The transmission component active lubrication flow rate testing method according to claim 1, characterized in that: In step 3, the current time is recorded as t0, and the mass of the lubricating oil in the oil collecting device at time t0 is recorded as w0; In step 4, the waiting time is recorded as t1, and the corresponding lubricating oil mass is recorded as w1. The flow rate of the active lubrication test system is calculated using the following formula: Among them, ρ T Indicates the density of the lubricating oil at the set temperature; g represents the acceleration due to gravity; Q1 represents the flow rate of this active lubrication test system; In step 5, calculate the flow rate for the active lubrication test system using the following formula: Where n represents the total number of times the flow rate of the active lubrication test system is calculated; Q1 to Q n represents the flow rate of the active lubrication test system calculated for the first time to the flow rate of the active lubrication test system calculated for the nth time in sequence; Represents the flow rate of the active lubrication test system.

4. The transmission component active lubrication flow rate testing method according to claim 1, characterized in that: In step 5, the flow rate of the active lubrication test system is calculated again at least twice using the method of step 4, and flow rate data of at least three active lubrication test systems are obtained.

5. A test model based on an active lubrication test system for a transmission, characterized in that: The test model of the active lubrication test system is optimized based on the active lubrication flow data measured by the active lubrication flow test method for transmission parts according to claim 3.

6. The test model of the transmission-based active lubrication test system according to claim 5, characterized in that: It includes oil pump model, oil channel model, centrifugal force model, bearing model and clutch model.

7. The test model of the transmission-based active lubrication test system according to claim 5, characterized in that: The test model of the transmission-based active lubrication test system is built using AMEsim.

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