Design of generated axial force measurement tester for tripod constant velocity joints under shudder condition
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DOI 10.1007/s12206-014-0913-9
Design of generated axial force measurement tester for tripod constant velocity joints under shudder condition†Kwang-Hee Lee1, Deuk-Won Lee1, Jin-Ho Chung1, Won-Oh Cho2 and Chul-Hee Lee1,* 1
Department of Mechanical Engineering, Inha University, Incheon, 402-751, Korea 2 R&D Center, ChangAm LS, Asan, Korea
(Manuscript Received June 21, 2013; Revised April 17, 2014; Accepted June 13, 2014) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Abstract 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. Keywords: Constant velocity joint; Generated axial force; Vibration; Shudder; Grease ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1. Introduction Constant velocity (CV) joints allow a vehicle driveshaft to transmit power from the engine to the wheels through a variable angle with a constant rotational speed. CV joints are mostly used in driveshafts of front-wheel or all-wheel drive vehicles, except for vehicles with rigid rear axles, such as trucks or pick-ups. A plunge-type CV joint is usually used at the inboard end, which is located between the driveshaft and the engine, whereas a fixed-type CV joint is used at the outboard end. These two types of CV joints can change the length of the driveshaft and the articulation angles according to road conditions or vehicle state. Tripod CV joints at the inboard are favored for automatic transmission vehicles because of their low noise and vibration with lower plunging resistance over ball-type joints. A tripod CV joint consists of an outer housing, which is formed with three track grooves extending along the shaft axis, and a central spider, which is composed of three trunnions equally spaced at 120° circumferential
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