Device for measuring positioning parameter of wheel and KC test bench

Abstract

The invention discloses a device for measuring a positioning parameter of a wheel in a vehicle chassis system KC test bench. The device comprises a support apparatus disposed on a vertical loading table of the KC test bench, a six-freedom-degree parallel mechanism platform, and a rotating disc connected with the wheel. The wheel is fixedly connected with the rotating disc, and the rotating disc is fixed with one end of a moving platform of the six-freedom-degree parallel mechanism platform. One end of a fixed platform of the six-freedom-degree parallel mechanism platform is fixedly connected with the support apparatus. Six branch chains are disposed between the moving and fixed platforms of the six-freedom-degree parallel mechanism platform. Each branch chain is a flexible branch chain with a plurality of freedom degrees, and is provided with a displacement sensor which is used for measuring the displacement change of the corresponding branch chain so as to calculate the spatial attitude of the wheel. The positioning parameter of a tyre can be obtained through the displacement changes and measurement value of a displacement sensor of a KC test bench loading system. The invention also discloses the vehicle chassis system KC test bench equipped with the above device. The device can accurately obtain the positioning parameter of a KC test tyre through the principle of parallel mechanism measurement, is smaller in error, and is convenient to install.

Description

technical field [0001] The invention belongs to the technical field of vehicle chassis system KC test, in particular to a device for measuring wheel alignment parameters in a vehicle chassis system KC test platform and a KC test platform with the device. Background technique [0002] The KC test of the vehicle chassis system mainly includes parallel wheel jump, reverse wheel jump, longitudinal force loading, lateral force loading, righting moment loading and in-situ steering conditions. The drive loading methods of the test bench are mainly vertical (Z' direction), lateral (Y' direction), longitudinal (X' direction) and vertical rotation (Rz' direction) loading. The measurement target parameters mainly include the vertical (z direction), lateral (y direction), longitudinal (x direction) linear displacement of the wheel center, the angular displacement of the tire around the x, y, and z axis directions, the vertical and lateral displacement of the tire ground contact center ...

AI Technical Summary

Problems solved by technology

The six-degree-of-freedom robot arm measures the rotation angles of the six rotation axes through six absolute angular displacement sensors, and calculates the positioning parameters of the wheel center by combining the known arm lengths. However, since the robot arm is essentially a series mechanism, it is easy to cause errors to accumulate and amplification effects, which affect the accuracy of the measurement results; and the three-point method is to install three high-precision micro-displacement sensors on the wheel hub, and calculate the angular displacement and linear displacement of the wheel center according to the numerical value of the sensor. The error of the three-point method measurement principle makes the wheel coordinate system have a certain deviation from the defined coordinate system, resulting in a certain error between the measured wheel toe angle and camber angle and the theoretical value

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