High pressure oil pump for continuous variable speed drive, has channel provided external to body for supplying low pressure oil from cylinder on all races of body in order to obtain pump with null flow on reaching maximum pressure

摘要

The pump has a piston (4) that moves inside a body of the pump. The piston is mounted in a cylinder (7) fixed against a spring (10) that is placed at a head of the body. A channel (14) is provided external to the body for supplying low pressure oil from the cylinder on all races of the body in order to obtain the pump with null flow on reaching maximum pressure.