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:
Sep. 24, 1985
Filed:
Oct. 31, 1984
Tsunenori Shibuya, Saitama, JP;
Diesel Kiki Co., Ltd., Tokyo, JP;
Abstract
Front and rear radial roller bearings are provided in front and rear side blocks of the pump housing. A partition wall member is secured to an end face of the rear side block remote from the rotor to define a sealing chamber therebetween. The sealing chamber communicates with a back pressure chamber in the rotor through the rear radial roller bearing. A shaft-seal chamber defined between the front head and the front side block communicates with the back pressure chamber through the front radial roller bearing. The pump housing is formed therein with passage means communicating the discharge pressure chamber with at least one of the sealing chamber and the shaft-seal chamber. The passage means has valve means arranged therein, which is operable to open when the difference in pressure between the discharge pressure chamber and the back pressure chamber is below a predetermined value and to close when the pressure difference is above the latter, to thereby establish and interrupt communication between the discharge pressure chamber and at least one of the sealing chamber and the shaft-seal chamber.