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:
Jun. 05, 2018
Filed:
Mar. 06, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Jun Soeda, Fujisawa, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka-Shi, JP;
Abstract
A pump deviceincludes a relief valvehaving a balland a valve seat. The valve seathas a ring-shaped seat surfacehaving a wide portionand a narrow portionon which the ballis seated. Upon valve opening, the ballis pressed in a valve opening direction by a pressing force Faccording to a pressure P of working fluid while being pressed against the wide portion. The ballrolls on the seat surfaceupon the valve opening while continuing or keeping contact with the wide portion. At this time, the ballis stably held with the ballcontacting the wide portionof the seat surface. Noise of the relief valvecaused by vibration of the ballis therefore suppressed.