Auxiliary frame fatigue test bending moment and torque elimination device

Abstract

The invention aims at providing an auxiliary frame fatigue test bending moment and torque elimination device comprising a spindle, a height adjusting device, a universal joint, a transmission shaft and a torque elimination device. The spindle is installed on the height adjusting device and can perform elevating motion along a vertical direction under the effect of the height adjusting device. The two ends of the spindle are arranged at the two sides of the height adjusting device. The front end of the spindle is provided with the universal joint, and the rear end of the spindle is provided with a workpiece connecting part. The torque elimination device is connected with the universal joint through the spindle. The other end of the torque elimination device is connected with the transmission shaft. The defects in the prior art can be overcome by the device, and the device has the characteristics of eliminating the bending moment and the torque and enhancing the service life and the test accuracy.

Description

technical field [0001] The invention relates to the field of fatigue testing devices, in particular to a bending moment and torque eliminating device for subframe fatigue testing. Background technique [0002] The subframe can be regarded as the skeleton of the front and rear axles, and is an integral part of the front and rear axles. The sub-frame is not a complete frame, but only supports the front and rear axles, the suspension passes through it and then connects with the "positive frame", which is customarily called "sub-frame". The function of the subframe is to block vibration and noise and reduce its direct entry into the compartment; as an important part of the chassis, the subframe is subjected to complex stress conditions and bears various types of loads, including static force, impact, and alternating loads . Therefore, it is very important to analyze and check its strength and fatigue strength. In addition, in the prior art, when conducting the longitudinal fa...

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Problems solved by technology

In addition, in the prior art, when carrying out the longitudinal fatigue strength test of the sub-frame, the transmission shaft between the workpiece, the sensor, and the actuator (power source) needs to be strictly on the same straight line, although the existing adjustment device has reached a higher accuracy, but it is difficult and costly to achieve strict collinearity, and it is even impossible to achieve true collinearity. The drive shafts cannot be strictly collinear so that bending moments and torques appear between their drive shafts, even if the bending moment or rotation The moment is very small, but under the conditions of the strength and number of experiments such as fatigue strength testing, the harm caused by the bending moment is magnified, ranging from damage to the transmission shaft, to damage the sensor, and at the same time reducing the service life of the fatigue strength test device and The test accuracy reduces the efficiency of the test and greatly increases the cost of the fatigue strength experiment

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