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:
Mar. 10, 1992
Filed:
Sep. 11, 1990
Kiyoshi Wakabayashi, Okazaki, JP;
Masami Sakamoto, Aichi, JP;
Tsuyoshi Handa, Okazaki, JP;
Hidenobu Yamaguchi, Handa, JP;
Toyooki Kogyo Kabushiki Kaisha, Okashi, JP;
Abstract
A hydraulic pump or motor having a rotary cylinder barrel formed with a plurality of cylinders in which a corresponding number of plungers are axially slidably disposed for reciprocation and a valve plate in frictional engagement with an end face of the cylinder barrel and being formed with a suction slot and a discharge slot to be communicated with the cylinders of the barrel, wherein the cylinder barrel is contained within a cavity formed in a housing having an end wall formed with an inlet passage in open communication with the suction slot of the valve plate and an outlet passage in open communication with the discharge slot of the valve plate, and a fluid control valve assembly is disposed in the end wall of the housing to permit the flow of hydraulic fluid supplied therethrough into the cavity of the housing from the outlet passage when applied with the pressure of hydraulic fluid higher than a predetermined value. A discharge hole is formed in a peripheral wall of the housing to discharge the hydraulic fluid supplied in excess into the cavity of the housing from the outlet passage under control of the fluid control valve assembly.