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Title:
VARIABLE DISPLACEMENT PUMP WITH MULTIPLE PRESSURE CHAMBERS
Document Type and Number:
WIPO Patent Application WO/2014/111813
Kind Code:
A3
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 a plurality of pressure regulating chambers comprising a first chamber and a second chamber each for receiving pressurized fluid. The 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 control ring and having 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. The second chamber is defined between a pair of seals located in the circumferential direction of the ring and 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.

Inventors:
BOWING, Oliver (Aachener Strasse 203, Aashen, 52076, DE)
KUTZER, Hans, Peter (Tannenstrasse 4, Gangelt, 52538, DE)
Application Number:
IB2014/000581
Publication Date:
December 18, 2014
Filing Date:
January 15, 2014
Export Citation:
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Assignee:
STACKPOLE POWERTRAIN INTERNATIONAL ULC (2400 Royal Windsor Drive, Mississaugua Ontario, L5J 1K7, CA)
International Classes:
F04C2/324; F04B49/16; F04C2/22; F04C14/18; F04C15/00
Domestic Patent References:
WO2006045190A12006-05-04
WO2007128105A12007-11-15
Foreign References:
CA2588817A12006-06-29
Other References:
See also references of EP 2946113A4
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