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. 06, 1984
Filed:
Jul. 07, 1982
Yutaka Ishizuka, Saitama, JP;
Diesel Kiki Co., Ltd., Saitama, JP;
Abstract
The endless camming peripheral surface of the pump housing, which performs one cycle of suction, compression and discharge of fluid in cooperation with the vanes and the rotor, comprises an increasing radius portion along which the amount of protrusion of each vane gradually increases with movement of the vane, and first and second decreasing radius portions along which the amount of protrusion gradually decreases with movement of the vane, the three portions being successively arranged in the order mentioned in the advancing direction of the vanes. Each of the three portions has such a cam profile that the velocity of radial movement of each vane varies at a rate gradually decreasing as the vane approaches the terminating end of the portion. Preferably, the above one-cycle performing portion further includes one or two constant radius portions located between the above three portions, along which the amount of protrusion of each vane is kept substantially constant with movement of the vane.