Hydraulic pump

Abstract

Abstract PURPOSE: To expand the pressure receiving area without lengthening a pump shaft by movably coupling an outer ring with an eccentric cam driving a piston, forming a groove on the outer periphery of an outer ring, and bringing the piston into contact with the groove to restrict the movement of the outer ring. CONSTITUTION: When a motor 11 is driven, an eccentric cam 18 is rotated together with a rotary shaft 11a, a piston 24 is pushed by a ring 21 via a bearing 20 and reciprocated, thus the volume of a pressure generating room is changed. In this case, the ring (outer ring) 21 inserted with the bearing 20 is slidably coupled with the outer periphery of the eccentric cam 18. A circular groove 22 or the like is formed on the outer periphery of the ring 21. The end section on the eccentric cam 18 side of the piston 24 is brought into contact with the circular groove 22 or the like. The movement of the ring 21 in the axial direction against the piston 24 is thereby restricted by the side wall 22a or the like of the circular groove 22. The length of the bearing 20 in the axial direction can be lengthened, and the pressure receiving area can be expanded. COPYRIGHT: (C)1989,JPO&Japio

Inventors

• 👤 Yoshiki Ota

Bibliographic Details