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Several pieces of wire rope are used in the transport device of low noise elevator type mechanical parking system, EMPS. It is important to estimate the fatigue life of wire rope in order to keep the reliability of parking system. The formula proposed by G.Niemann in 1946, well known to be accurate in the fatigue life estimation of wire rope, has been modified and used in the design. But this formula has some problems such that it does not have the parameter of wire bending stress by sheaves, while the fatigue life depends on wire breakage by its repeated bending. In this paper, first, the damage mechanism and behavior of wire rope in this parking system were studied using the exchanged wire rope attained the criterion, 10% breakage of wire, and then the estimation method of fatigue life of wire rope is proposed, based on S-bend fatigue test simulated the actual condition, using the wire bending stress σb by sheaves and the fatigue strength reduction factor Kf which is related to the contact force PUC with driving sheave as a function of wire rope tension.

Fatigue Life Estimation of Wire Rope in Elevator-Type Mechanical Parking System