歯付ベルトの歯欠け損傷機構

概要

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The morphologies of tooth shearing in synchronous belts were observed after three types of fatigue tests. The synchronous belts investigated in this paper were constructed from FRR (fiber reinforced rubber) composite materials. The belts consist of rubber, fiber cords and facing fabrics. The belt type used here is round-tooth (STPD) with 8mm tooth pitch for high torque drives of automotive engines. The cord is made of glass fiber and a processing compound. The tooth are made of hydrogenated nitrile-butadiene rubber (HNBR) while the facing fablic is made of nylon.Two modes of failure initiation were observed. One was cord failure which was initiated under various conditions. Detailed observations showed that the interfaces between stranded glass filaments were separated at the centre of the cords. The extended direction of the separations was mainly vertical to the backface of the synchronous belt. The cord failure is considered to be the main failure-initiation mode under normal driving conditions. The other mode was crack initiation which was observed under a relatively high loading on the mating flank of the belt tooth. The cracks were initiated at the tooth roots of the synchronous belts.
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