SYSTEM ZUM EINSTELLEN DES UEBERSETZUNGSVERHAELTNISSES EINES STUFENLOSEN GETRIEBES.

摘要

An infinitely variable transmission has a primary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a secondary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, and a belt engaged with both pulleys. A hydraulic circuit having a transmission ratio control valve is provided for shifting the disc of the primary pulley in the downshift direction and upshift direction. The transmission ratio control valve is operated to shift the disc of the primary pulley in the downshift direction when the throttle valve of the engine is rapidly opened for accelerating the engine.