Abstract
To develop an anti-releasing wheel bolt for large trucks, the parallel serration (PS) type wheel bolt is introduced as an alternative for conventional saw blade (SB) type one. The forming load was analysed using FEM solver program according to the radius of curvature at the corner of serration top. The serration die for a PS type bolt which was designed with the possibly largest curvature radius (R) showed the lowest forming load at the top area of serration corner and PS type bolt die with R = 0.4 mm showed 1.6 times longer life cycle compared with SB type die. The PS type bolt revealed also higher clamping force and axial force compared with the SB type bolt.
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