Patent ID: 6309187
Filing Date: 2001-10-30
Classification: B62D,F04C

Abstract:
A hydraulic pump having a pump shaft coupled to a drive coupling, which is coupled to and driven by a motor shaft for use in a power steering system, said pump comprising:a pump housing;a power steering fluid inlet port formed in said pump housing and in communication with a power steering fluid reservoir;a power steering fluid chamber formed in said pump housing and in communication with said power steering fluid reservoir to receive said power steering fluid from said fluid inlet port;a fluid conduit having an inlet opening and an exit opening, said fluid conduit inlet opening in fluid communication with said power steering fluid chamber to receive power steering fluid therethrough;an integral pressure wave attenuator in communication with said fluid conduit exit opening and located integral with the pump to receive power steering fluid therefrom and to reduce the amount of fluid borne noise generated by pumping of the fluid; anda pump outlet in communication with said internal pressure wave attenuator to convey said power steering fluid from said pressure wave attenuator to a steering gear;said attenuator is formed to create a continuous passage around the drive coupling, said attenuator having length greater than a length of the drive coupling that is parallel to a centerline extending through the drive coupling from the pump shaft to the motor shaft;wherein said attenuator reduces the amount of noise generated by the drive coupling.