Title:
【発明の名称】液圧式流体ベーンポンプ
Document Type and Number:
Japanese Patent JP2003527519
Kind Code:
A
Abstract:
This invention offers advantages and alternatives over the prior art by providing a dual port hydraulic fixed displacement pump which exhibits improved efficiency by limiting the volume of discharged fluid which is subjected to the line pressure of a hydraulic system through mechanical valve control. According to the present invention, a pair of discharge ports are provided, namely a first discharge port and a second discharge port. Under all operating conditions, e.g., low and high pump speed operating conditions, the fluid flowing within the first discharge port and primary discharge passageway is exposed to the working pressure of the primary line, which represents a high pressure line. The second discharge port fluidly communicates with a secondary discharge passageway which is in selective fluid communication with a low pressure line connected to a low pressure area of the pump (e.g., a reservoir) under first operating conditions and is also in selective communication with the first discharge port and the primary discharge passageway under second operating conditions.
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Inventors:
Aden, David Earl
Leitwski, Thomas Sea
Etiene, Jarod Em
Leitwski, Thomas Sea
Etiene, Jarod Em
Application Number:
JP2001553537A
Publication Date:
September 16, 2003
Filing Date:
January 17, 2001
Export Citation:
Assignee:
Delphi Technologies Incorporated
International Classes:
F04C2/344; F04C11/00; F04C14/06; F04C14/26; (IPC1-7): F04C2/344; F04C15/04
Attorney, Agent or Firm:
Kazuo Shamoto (5 outside)