The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 2000
Filed:
Aug. 04, 1998
Kayaba Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A hydraulic pump or motor comprises a rotating disk member (31) supported free to rotate in a housing (11), and a cylinder block (14) supported free to rotate in the space of the housing (11) around a rotation axis inclined to the rotation axis of the rotating disk member (31). The rotating disk member (31) and cylinder block (14) are connected by a joint (17), and they are rotated in the same way by a drive shaft (12). A hemispherical shoe (29) in contact with the rotating disk member (31) via a spherical surface and having a smooth surface (29A) on the other side, comes in contact with a pad (27) of synthetic resin attached to the tip of a piston (20). The pad (27) has a smooth support surface (27A) perpendicular to the piston axis, and comes in contact with the smooth surface (29A) of the shoe (29) on this support surface (27A). A pocket (27D) for leading a cylinder internal pressure through the piston is formed on the contact surface between the pad (27) and shoe (29) forming a hydrostatic bearing. Each of the pistons (20) is pushed in the extending direction by a spring (21). A cylindrical piston cap (23) formed of a low friction synthetic resin on the outer circumference of the piston (20) slides in a cylinder bore (18).