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Regarding the polyester thermoplastic Elastomer (TPEE) boot used in a Constant Velocity joint(CVJ), it is effective to adopt soft and low frictional coefficient (μ) TPEE material which achieves compact size, low frictional noise and easy assembling. However, in the conventional low hardness TPEE, both grease resistance and heat resistance deteriorate, so it was necessary to improve the structure of TPEE polymers. We developed the new soft TPEE CVJ boot, focusing on the improvement method of TPEE polymers and design factors to achieve the compact and low frictional noise boot.

Upgrading of the performance and the durability of bellow boots used to seal constant-velocity joints are essential to seet the demand for higher performance and longer life automobiles. In this discussion about bellows boots for sealing constant-velocity joints, examples and analysis results of bench tests for studying wear and fatigue durability are presented.