Bando Chemical Industries, Inc.

Eiichiro Ikeda

Hirofumi Miyata

Yutaka Furukawa

Yoshihiro Akahoshi

Motoyoshi Yoshikawa

A toothed pulley P is made with a thermoplastic resin and includes a pulley body with an outer circumference along which teeth are arranged at a constant pitch. The pulley body is made of a resin composition containing a copolymer of nylon 6T and nylon 11 and glass fibers with a flat cross section.

Toothed pulley

In a continuous speed-shifting device in which a variable speed pulley mechanism and a planetary gear mechanism are combined with each other, respective cam mechanisms are provided on respective back sides of movable sheaves of variable speed pulleys of the variable speed pulley mechanism so as to move the sheaves toward and away from fixed sheaves of the variable speed pulleys, a linkage mechanism for linking both the cam mechanisms to each other is provided so that the diameters at which the belt is wound around both the pulleys are varied in a reverse direction to each other, the variable speed pulley mechanism is shifted in speed in such a manner that an output gear for supporting a pinion of the planetary gear mechanism is switched among a normal rotation state, a neutral state and a reverse rotation states with respect to a rotary shaft, the output gear is adjustable to the neutral state by a balance between the thrusts to the belt by both the pulleys, and the variable speed pulley mechanism serves as a circulating power channel at the forward state of the vehicle at which the use frequency is higher. Thus, the frequency with which large driving power is applied to the belt of the pulley mechanism is decreased so that the belt load is reduced, thereby readily obtaining the normal and reverse rotation states without a normal and reverse rotation mechanism.

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Kobe, Japan

Eiichiro Ikeda