Variable displacement pump with multiple pressure chambers where a circumferential extent of a first portion of a first chamber is greater than a second portion

US9109597B2 · kind B2 · utility

Assignee

• Stackpole International Engineered Products, Ltd. · CA

Inventors

• Oliver Böwing · Aachen, DE
• Hans Peter Kutzer · Gangelt, DE

Key dates

• Filing date: Jan 15, 2013
• Grant date: Aug 18, 2015
• Expiry date: Feb 4, 2033

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04C14/24
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A variable displacement vane pump has a plurality of seals between the inner surface defining the housing's internal chamber and an outer surface of the control ring. The seals define pressure regulating chambers. A first chamber is defined between a pair of seals located in a circumferential direction of the ring on opposing sides of the pivotal mounting of the ring and has at least one inlet for receiving pressurized fluid. The circumferential extent of the first chamber is greater along a portion for applying force to the ring in a second pivotal direction than along a portion for applying force in the first pivotal direction such that a net force is applied in the second pivotal direction. A second chamber has at least one outlet for receiving pressurized fluid such that the entire circumferential extent of the second chamber applies force to the ring in the second pivotal direction.