Development of quieter variable-displacement vane pump for hydraulic power steering system

摘要

This paper presents development research of a quieter (low-fluid borne noise level) variable-displacement vane pump for hydraulic power steering systems. A new cam ring profile for preventing vane bounce called the "modified profile cam ring" is proposed and its effectiveness is examined by noise tests in the passenger compartment of a real car as well as measurements of pump source flow ripple in the bench test circuit. Thu proposed cam ring is found to be able to reduce fluid borne noise at least to the level of a fixed pump. Newly developed pumps have already been put into practice.