Generated axial force (GAF) induced by internal friction in a tripod constant velocity (CV) joint causes shudder, which is related to lateral vibration in a vehicle. GAF is produced by tripod dynamics in the CV joint, and its magnitude is related to an applied torque and articulation angle. GAF provides periodic frictional force, owing to its kinematics, and causes take-off shudder that occurs when a vehicle abruptly accelerates from a stop position. Therefore, accurately estimating the GAF in a CV joint is necessary. A non-rotating type GAF measurement tester is developed to measure GAF more accurately, considering the shudder condition. Results of GAF measurements are compared with those obtained using an existing rotating-type tester. The developed tester provides linear results regardless of test conditions; thus, it can be used to estimate the magnitude of GAF and evaluate the friction performance of grease.
− Generated Axial Force (GAF) due to internal friction at Constant Velocity (CV) joints is one of the causes generating vibration problems such as shudder in vehicle. In this study, the GAF measuring tester is developed to precisely measure GAF caused by internal friction in CV joints. As the developed tester can control temperature at joint, driving torque, angle of rotation and joint angles, actual driving conditions such as sudden acceleration can be applied to the machine. GAFs are measured and compared by using different types of grease in tripod housing. Also GAFs are measured for both new and used CV joints to be compared and analyzed. The test result shows the repeatability and consistency of the tester in terms of the different test conditions. By using the developed CV joint tester, friction performance of the joint can be evaluated by proposing the best CV joints as well as greases generating the lowest GAF.
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