Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Reexamination Certificate
2008-02-05
2010-12-07
Kramer, Devon C (Department: 3746)
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
C418S031000
Reexamination Certificate
active
07845915
ABSTRACT:
A rotary pump for producing a pressure medium flow for a consumer, includes a pump housing in which a curved ring is inserted. A rotor is rotatably borne on a drive shaft in the curved ring. The rotor carries displacement elements at a tangential distance to one another which form a pump chamber between the rotor and the curved ring with a suction opening. A pressure medium-activated adjusting device is operable for changing the eccentricity of the curved ring relative to the rotor, and includes a first pressure chamber and a second pressure chamber fluidically and tangentially distanced from the first pressure chamber The pressure in the first and second pressure chambers is controlled by a flow control valve, the low pressure chamber of which communicates with a first control line on a downstream side of a metering orifice. The first control line, as seen from the rotational direction of the rotor, opens at the beginning of the pressure opening such that a tangential pulse of the pressure medium is led to the metering orifice and a second control line opens at a secondary connector into the pressure opening such that a tangential and radial pulse of the pressure medium is led to a high pressure chamber of the flow control valve.
REFERENCES:
patent: 6155797 (2000-12-01), Kazuyoshi
patent: 2002/0192081 (2002-12-01), Okada et al.
patent: 23 07 218 (1974-02-01), None
patent: 199 42 466 (2000-03-01), None
patent: 10 2004 020 603 (2005-12-01), None
patent: 56-143384 (1981-11-01), None
Jordan and Hamburg LLP
Kramer Devon C
Stimpert Philip
ZF Lenksysteme GmbH
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