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Method and system for testing stress-strain of hydrodynamic retarder

A hydraulic reducer, stress-strain technology, applied in the field of hydraulic reducer, can solve the problems of inability to accurately test stress and strain, and achieve the effects of accurate selection, improved test accuracy, and simple operation

Active Publication Date: 2020-05-26
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem in the prior art that the stress and strain cannot be accurately tested during the braking process of the hydraulic retarder, the present invention provides a method and system for testing the stress and strain of the hydraulic retarder, which is suitable for the structure of the hydraulic retarder Strain test for strength check, using the test method to check the structural strength of the impeller of the hydraulic reducer under braking conditions, providing guidance and verification for the structural design and structural strength simulation analysis of the hydraulic reducer

Method used

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  • Method and system for testing stress-strain of hydrodynamic retarder
  • Method and system for testing stress-strain of hydrodynamic retarder
  • Method and system for testing stress-strain of hydrodynamic retarder

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Embodiment 1

[0062] In order to achieve a technological breakthrough in the hydraulic retarder, it is necessary to master the structural strength test verification method of the hydraulic retarder based on optimal design, and establish a structural stress-strain test method for extreme braking conditions. Therefore the present invention provides a kind of test method of hydraulic retarder stress strain, such as figure 1 shown, including:

[0063] Step S1, pasting a plurality of strain gauges on the hydraulic retarder to be tested, installing the hydraulic retarder to be tested on the test bench, and connecting each strain gauge to a stress-strain tester;

[0064] Step S2, perform braking at each set rotational speed point, and record the measurement data of all strain gauges at said rotational speed point;

[0065] Step S3, calculating the stress on the hydraulic retarder to be tested based on the measurement data;

[0066] The measured data includes: torque, temperature and strain value...

Embodiment 2

[0086] In order to further illustrate the measurement method provided by the present invention, the cast aluminum 101A hydraulic retarder is taken as an example for illustration in this embodiment. The application environment of the cast aluminum 101A hydraulic reducer is oil mist and instantaneous high temperature environment of nearly 120°C. The external dimensions of the fixed wheel of the hydraulic reducer are: outer diameter D = 480mm, diameter of the working chamber d = 420mm, thickness of the fixed wheel H = 36mm, When working, the cavity is filled with 10W-40 transmission oil, and the oil filling volume depends on the braking conditions. The emergency braking condition is the maximum oil filling volume, and the oil filling rate is nearly 90%.

[0087] The stress-strain test is carried out on the cast aluminum 101A hydraulic reducer fixed wheel, which specifically includes the following steps:

[0088] (1) Select the strain point of the test

[0089] Such as Figure 2...

Embodiment 3

[0114] Based on the same inventive concept, the present invention also provides a stress-strain testing system for a hydraulic retarder, including:

[0115] Assembling a module for pasting a plurality of strain gauges on the hydraulic retarder to be tested, installing the hydraulic retarder to be tested on the test bench, and connecting each strain gauge to a stress-strain tester;

[0116]The measurement module is used for braking at each set rotational speed point, and records the measurement data of all strain gauges at the said rotational speed point;

[0117] A calculation module, configured to calculate the stress on the hydraulic retarder to be tested based on the measurement data;

[0118] The measured data includes: torque, temperature and strain values.

[0119] In an embodiment, the assembly module includes:

[0120] determining an alternative sub-module for determining an alternative strain gauge attachment point on the fixed wheel blade of the hydraulic retarder ...

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Abstract

The invention provides a method and system for testing the stress and strain of a hydrodynamic retarder, and the method comprises the steps: pasting a plurality of strain gauges on a to-be-tested hydrodynamic retarder, installing the to-be-tested hydrodynamic retarder on a test bench, and connecting each strain gauge to a stress and strain tester; carrying out braking at each set rotating speed point, and recording measurement data at the strain gauges of all the rotating speed points; and calculating the stress borne by the to-be-measured hydrodynamic retarder based on the measurement data.The method provided by the invention is simple to operate. According to the actual bearing characteristics of the hydrodynamic retarder, strain gauges are used for obtaining strain information as comprehensive as possible, the problem that accurate quantification of the influence of the rotating speed, the braking torque and the temperature on stress and strain of the fixed wheel cannot be obtained is solved, and a technical means is provided for deeper research on the braking torque and the temperature and structure deformation relation of the hydrodynamic retarder.

Description

technical field [0001] The invention relates to the technical field of hydraulic retarders, in particular to a method and system for testing stress and strain of hydraulic retarders. Background technique [0002] With the development of vehicles in the direction of high-speed and heavy loads, relying only on traditional mechanical friction brakes can no longer meet people's requirements for vehicle safety and comfort, especially for vehicles traveling in mountainous areas and mines (including large-tonnage loads) Cars and large passenger cars), in order to limit the speed of the vehicle when going downhill with a full load, it is necessary to ensure continuous braking for a long time, and use brake shoes to brake frequently on long and large slopes, which will cause the brake shoes to heat up, reduce the friction coefficient, and reduce the braking load. If it is too large, the so-called thermal fading phenomenon of brake braking efficiency will appear, which will seriously ...

Claims

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Application Information

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IPC IPC(8): G01D21/02
CPCG01D21/02
Inventor 李慧渊宋振川吕庆军徐鸣徐宜卜树峰钟超杰宋美球
Owner CHINA NORTH VEHICLE RES INST
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