BELT TRANSMISSION WITH AUTOMATIC TENSION ADJUSTING MECHANISM

Japanese Patent JPH01182662

A

PURPOSE:To aim at the promotion of reduction in a floor space for a driving pulley and its lightweightiness by constituting both first and second pulley members in this driving pulley to be coupled together by a cam mechanism. CONSTITUTION:In an unloaded state, tension of a timing belt 10 comes to zero and each contact 6 and a cam 7 are engaged with each other in the state that shaft centers O1, O2 of both first and second pulley members 4, 5 for a driving pulley 3 are decentered at the peak. When driving force is added to a drive shaft 1, an engaging position between each contact 6 and the cam 7 is continuously shifted and varied according to this driving force, and each eccentric value of these pulley members 4, 5 is varied in the decreasing direction. Accordingly, the member 5 is shifted in direction of increasing belt pitch circumferential length, and since constant tension is always distributed to both tensile and loose sides of the belt 10, a skip phenomenon in the belt 10 is restrained from occurring. In this case, since these members 4, 5 are coupled together by a cam mechanism, rotation of the drive shaft 1 can be transmitted to the driving pulley at the transmission ratio of 1:1, so that even if a diameter of the pulley 3 grows larger, speed-up transmission is giveable to a driven pulley 9.

KAWAHARA HIDEAKI
KURIHARA YASUO

JP649288A

July 20, 1989

January 14, 1988

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BANDO CHEMICAL IND

F16H7/14; (IPC1-7): F16H7/14

Hiroshi Maeda

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