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:
Nov. 26, 1991
Filed:
May. 16, 1990
Toshifumi Maehara, Saitama, JP;
Akebono Brake Industry Co., Ltd., Tokyo, JP;
Akebono Research and Development Center Ltd., Hanyu, JP;
Abstract
In a plunger-operated hydraulic pump, a cylinder has an ejection port extending from its upper end portion with an ejection valve provided at the ejection port. A piston and a plunger fitted in the cylinder are urged towards an eccentric cam by a first return spring and a second return spring which is stronger than the first return spring, respectively. The cylinder has a suction port in its lower end portion in such a manner that it is not closed by the plunger, so that the suction valve is opened by the downward stroke of the plunger, and during suction, the inflow resistance of the suction valve is minimized. Further, in the hydraulic pump, a plurality of cylinders are arranged at equal angular intervals so that the vibrations due to the reciprocations of the plungers are canceled by one another, thereby greatly suppressing the vibration of the cylinder block.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile