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:
Oct. 21, 2025
Filed:
Jul. 05, 2022
Hitachi Astemo, Ltd., Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
In a variable displacement oil pump (VP) according to the present invention, a coil spring (SP) as an urging member is arranged at a position that does not overlap a first suction port (), a first discharge port () and an inlet () which correspond to a suction portion when viewed from an axial direction along a drive shaft (). Therefore, in the variable displacement oil pump (VP), there is no risk that during pump operation, flow of oil introduced into the pump chamberslocated in a suction region through the first suction port (), the first discharge port () and the inlet () corresponding to the suction portion will be interrupted by the coil spring (SP). With this, in the variable displacement oil pump (VP), a suction resistance during the pump operation is reduced, then a suction performance of the pump can be improved.