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In this study,GAF(Generated Axial Force)estimation modelling about tripod shudderlesstype CVJ(Constant Veloc-ity Joint)called WTJ(Wrinkled Tripod Joint)was derived.GAF in WTJ was estimated through mathematical and theoretical approa-ches according to design parameter identification,contact point analysis,acting force analysis and friction characteristic analysis.And the estimated GAF was verified through CVJ component test.Through the match between estimated GAF and measured GAF,it is possi-ble to apply this GAF estimation modelling for improving the CVJ problem.