Automobile hydraulic electric power steering reliability test bench and program control test method

Abstract

The invention relates to an automobile hydraulic electric power steering reliability test bench and program control test method. An input system comprises a servo motor, a reducer and a universal joint connected with the input end of a steering gear; an output system comprises a linear hydraulic cylinder with two functions of driving and load simulation, the front pole of a hydraulic cylinder piston is provided with a pressure sensor and connected with the rocker arm of the output end of the steering gear by a coupler with a joint bearing. An eccentric shaft, an eccentric bushing and a variable frequency motor are arranged at the inner bore of the rear lug of the hydraulic cylinder to form an automobile vibration simulation system, so as to simulate real vibration of rugged road surface. The hydraulic cylinder is compact and simple in structure, system integration is high and usable range is wide. The joint bearing causes the installation to be convenient. The hydraulic loop includes a throttle valve, thus speeding up oil-taking. An industrial personal computer, a motion control card and a data acquisition card are used, so that system stability is high, measurement accuracy is high, and response speed is fast. Curves and process control can be displayed in real time, and automatic save, plotting and printing can be realized. The test bench set can complete all reliability tests of fatigue, wear, forced steering, inverse overload and overpressure.

Description

[0001] (1) Technical Field: The present invention relates to a reliability test bench for automobile hydraulic power steering, which belongs to the equipment test category (G01M). (2) Background technology: [0002] Automobile power steering gear is a key component of automobiles. Performance testing of power steering gear products is an important project. Many domestic organizations have studied the hydraulic steering gear test bench system, and their products have their own characteristics: The test bench system of the China Institute of Metrology can achieve the following functions: The total number of unloaded turns and the unloaded moment of the steering gear, the input shaft torque when the steering gear is fully loaded, the measurement of free clearance, the sensitivity and force characteristics of the steering gear, and the steering gear's return ability, etc. The design layout of the test bench is close to reality, but the applied load It is a fixed simple load, and the si...

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Problems solved by technology

[0003] Chinese patent application: 'automobile steering gear assembly variable load test bench system' patent application number: 02109786.0, the load size is completed by the loading box at the input end of the steering gear, and the loading box simulates the torque force of the tire through a torsion spring. The simulation is not suitable for systems where there is no sensor at the input end to indicate the magnitude of the torque, and at the same time, the performance test of the input end cannot be realized by controlling the load at the output end

This device can only complete one test of durability test, and there is no vibration simulation system for uneven road surface

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