Transmission output shaft radial offset measuring method

Abstract

The invention discloses a transmission output shaft radial offset measuring method, and belongs to the technical field of transmission testing. The method comprises: installing a sensor; debugging the sensor; connecting and recording data of other sensors; processing displacement test data; the maximum working condition point is found out after extreme value analysis; and according to the whole vehicle state at the maximum working condition point, adaptive optimization is conducted on the transmission output shaft and the oil seal state. According to the invention, the dynamic test of the radial displacement of the transmission output shaft in various limit states of the whole vehicle is realized, the working states of the transmission output shaft and the transmission shaft of the whole vehicle in various dynamic working conditions can be accurately known, and the life cycle of the rear oil seal of the transmission output shaft is accurately calculated through the offset and the vibration frequency. Whether strength optimization is needed or not is effectively judged, the optimization amount is accurately controlled, and accurate positioning of quality and cost is achieved.

Description

Technical Field

[0001] The invention relates to a method for measuring the radial offset of a transmission output shaft, and belongs to the technical field of transmission testing. Background Art

[0002] In the power transmission system of rear-wheel drive vehicles, the transmission output shaft is usually designed with supports at both ends. However, this design is difficult to achieve absolute accuracy in terms of dynamic balance. When the vehicle is running at high speed, due to factors such as vibration, the transmission output shaft is prone to lateral and radial deviation.

[0003] Radial misalignment of the transmission output shaft is a common problem, especially when the vehicle is traveling at high speeds or undergoing severe acceleration and deceleration. Radial misalignment not only affects the vehicle's driving stability and reduces the driving experience, but more importantly, it puts additional stress on the internal structure of the transmission. In the long run, this additional stress may cause increased wear of the internal parts of the transmission and even cause serious problems such as oil seal damage.

[0004] As a key component in the transmission, the oil seal has the main function of preventing the leakage of lubricating oil and ensuring the normal operation of the transmission. However, when the offset of the transmission output shaft is too large or the offset frequency is too high, the oil seal is very easy to be damaged. Once the oil seal is damaged, it will directly lead to the leakage of the transmission lubricating oil, which will in turn affect the lubrication effect and heat dissipation performance of the transmission. In severe cases, it may cause transmission failure and even affect the normal operation of the entire power transmission system.

[0005] At present, there is still a gap in the test method for the radial offset of the transmission output shaft. In the early stage of transmission design, there is often a lack of relevant parameters under the operating state of the whole vehicle, which makes it impossible to conduct comprehensive and accurate testing and evaluation of the product. At the same time, due to the weight distribution and model differences of vehicles, if each model needs to be tested for radial offset separately, this will undoubtedly increase the complexity and cost of the test. Summary of the invention

[0006] In order to solve the problems existing in the background technology, the present invention provides a method for measuring the radial offset of a transmission output shaft.

[0007] To achieve the above object, the present invention adopts the following technical solution: a method for measuring the radial offset of a transmission output shaft, the method comprising the following steps:

[0008] S1: Install the sensor;

[0009] S101: making a mounting bracket for the radial displacement sensor;

[0010] The number of the radial displacement sensor is at least one. When the number of the radial displacement sensor is more than one, all radial displacement sensors are evenly distributed along the circumference of the transmission output shaft.

[0011] S102: Installing a mounting bracket along the circumference of the transmission output shaft, with the mounting position being between the transmission housing and the transmission output shaft flange;

[0012] S103: Install the laser displacement sensors one by one on the mounting brackets, and test the working status of the sensors to ensure that the sensors work normally.

[0013] S2: debug sensor;

[0014] S3: connect and record other sensor data;

[0015] S4: perform displacement test;

[0016] The displacement test includes a high-speed loop full throttle maximum vehicle speed test, a bumpy road full throttle acceleration test, and a slope section maximum climbing angle test.

[0017] The displacement test includes two states: no-load and full-load.

[0018] The maximum climbing angle test of the slope road section includes a slope rush test, a slope top test and a slope parking test.

[0019] S5: Data processing;

[0020] S6: Find the maximum operating point after extreme value analysis;

[0021] S7: Adaptively optimize the transmission output shaft and oil seal status according to the vehicle status at the maximum operating point.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention realizes the dynamic test of the radial displacement of the transmission output shaft under various extreme conditions of the whole vehicle, can accurately understand the working state of the transmission output shaft and the transmission shaft of the whole vehicle under various dynamic conditions, and accurately calculates the life cycle of the rear oil seal of the transmission output shaft through the offset and vibration frequency, effectively judges whether strength optimization is needed and accurately controls the optimization amount, and realizes the precise positioning of quality and cost. It fills the gap in the field of whole vehicle testing, intuitively shows the performance of the transmission output shaft under different working conditions, has a significant effect on the optimization of the output shaft angle and the rear oil seal, and reduces fatigue durability, while improving the iteration speed of parts and test efficiency and reducing costs. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] A method for measuring radial offset of a transmission output shaft, the method comprising the following steps:

[0026] S1: Install the sensor;

[0027] S101: Design and manufacture the mounting bracket of the transmission output shaft radial displacement sensor according to the test vehicle, the transmission suspension under test and the reserved mounting holes around it;

[0028] The number of the radial displacement sensor is at least one. When the number of the radial displacement sensor is more than one, all radial displacement sensors are evenly distributed along the circumference of the transmission output shaft.

[0029] S102: Install the mounting brackets along the circumference of the transmission output shaft to ensure that all mounting brackets are on the same circumference. The installation position is between the transmission housing and the transmission output shaft flange, and the main measurement position is the bearing section between the output shaft rear oil seal and the output shaft flange;

[0030] S103: Install the laser displacement sensors on the mounting brackets one by one, and test the working status of the sensors to ensure that the sensors work normally;

[0031] S2: debug sensor;

[0032] Fine-tune the laser sampling point of the laser displacement sensor to ensure that the laser beam is evenly distributed and that the incident laser is on the same motion circle of the output shaft;

[0033] S3: Connect and record other sensor data, such as engine speed, vehicle speed, engine output torque, turbine speed, accelerator pedal opening, output shaft speed, etc., for subsequent analysis;

[0034] S4: perform displacement test;

[0035] The displacement test includes a high-speed loop full throttle maximum vehicle speed test, a bumpy road full throttle acceleration test, and a slope section maximum climbing angle test in an unloaded state, and a high-speed loop full throttle maximum vehicle speed test, a bumpy road full throttle acceleration test, and a slope section maximum climbing angle test in a fully loaded state.

[0036] The maximum climbing angle test of the slope road section includes a slope rush test, a slope top test and a slope parking test.

[0037] S5: Data processing;

[0038] Since the displacement change of the output shaft measured by the radial displacement sensor has the characteristics of high frequency and low amplitude, it is impossible to use any filtering function inside the sensor for data acquisition, and only the original displacement information can be displayed. However, the problem caused by this is that the occasional high-frequency noise inside the sensor cannot be effectively confirmed. Simply removing the high-frequency points in the waveform may filter out the true position signal, causing artificially introduced errors. Therefore, it is necessary to perform phase calibration and average filtering on the raw data.

[0039] Since the sensors are evenly distributed and the measuring points are all in the same circle, the vibration signals measured by each sensor should be in phase. Therefore, when analyzing, the phases of the last few sensors should be advanced in phase, so that the vibration data of all sensors are in the same measurement state in the rotation cycle. At this time, the overlap of the waveform data should be highly consistent. Any abnormal high point or sinking point in each measurement data can be eliminated.

[0040] S6: Find the maximum operating point by analyzing the extreme values ​​of the displacement data of the full throttle maximum speed test on the high-speed loop, the full throttle acceleration test on the bumpy road, and the maximum climbing angle test on the slope section;

[0041] S7: Adaptively optimize the transmission output shaft and oil seal status according to the vehicle status at the maximum operating point, so as to achieve the purpose of optimizing the overall quality and extending the product life.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included in the present invention.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for measuring radial offset of a transmission output shaft, characterized in that: The method comprises the following steps: S1: Install the sensor; S2: debug sensor; S3: connect and record other sensor data; S4: perform displacement test; S5: Data processing; S6: Find the maximum operating point after extreme value analysis; S7: Adaptively optimize the transmission output shaft and oil seal status according to the vehicle status at the maximum operating point.

2. A method for measuring radial offset of a transmission output shaft according to claim 1, characterized in that: The S1 comprises the following steps: S101: making a mounting bracket for the radial displacement sensor; S102: Installing a mounting bracket along the circumference of the transmission output shaft, with the mounting position being between the transmission housing and the transmission output shaft flange; S103: Install the laser displacement sensors one by one on the mounting brackets, and test the working status of the sensors to ensure that the sensors work normally.

3. A method for measuring radial offset of a transmission output shaft according to claim 2, characterized in that: S101 The number of the radial displacement sensors is at least one. When the number of the radial displacement sensors is more than one, all radial displacement sensors are evenly distributed along the circumference of the transmission output shaft.

4. The method for measuring radial offset of a transmission output shaft according to claim 1, characterized in that: The displacement test includes a high-speed loop full throttle maximum vehicle speed test, a bumpy road full throttle acceleration test, and a slope section maximum climbing angle test.

5. A method for measuring radial offset of a transmission output shaft according to claim 4, characterized in that: The displacement test includes two states: no-load and full-load.

6. A method for measuring radial offset of a transmission output shaft according to claim 4, characterized in that: The maximum climbing angle test of the slope road section includes a slope rush test, a slope top test and a slope parking test.