Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Reexamination Certificate
2002-07-10
2004-09-14
Yu, Justine R. (Department: 3746)
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
C417S221000, C417S216000, C417S203000, C417S213000, C184S006160, C418S030000
Reexamination Certificate
active
06790013
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to fluid pumps and more particularly to a variable displacement vane pump and control and operation of the pump under varying engine speed conditions.
BACKGROUND OF THE INVENTION
Hydraulic power transmission assemblies and fluid distribution systems may utilize a vane-type pump. Such pumps typically have a rotor with a plurality of circumferentially spaced vanes rotatably carried by the rotor and slidable relative thereto in slots provided in the rotor. The rotor and vanes cooperate with the internal contour of a containment ring or eccentric ring eccentrically mounted relative to an axis of the rotor and vanes to create fluid chambers between the containment ring or eccentric ring, rotor and vanes. Due to the eccentricity between the containment ring or eccentric ring and the rotor and vanes, the fluid chambers change in volume as they are moved with the rotating rotor and become larger in volume as they are moved across an inlet port and smaller in volume across an outlet port. To vary the eccentricity between the containment ring or eccentric ring and the rotor, the containment ring or eccentric ring may be pivoted upon a fixed axis in a pump housing. Pivoting the containment ring or eccentric ring varies the change in volume of the fluid chambers in use of the pump and hence, varies the displacement characteristic of the pump. A description of inherent problems with prior art pumps is set forth in the Background of Invention section of the above-referenced co-pending opposition U.S. Ser. No. 10/021,566. A description of an improved pump and method of control is set forth below.
While such a pump improves proper oil pressure and flow control improvements in oil control are desired.
A typical internal combustion engine requires a certain flow rate of lubricating oil delivered within a certain range of pressure, the flow rate and pressure varying with the speed of crankshaft rotation, the engine temperature and the engine load. A fixed displacement pump operating at high speeds and at cold start conditions can produce excessively high oil pressures, and at high temperature and low speed conditions the oil pressure can be less than desired. Increasing the displacement of the oil pump to improve the oil pressure at high temperature and low speed conditions will consume more power at all conditions and will worsen the excessive oil pressure at high speed and low temperature conditions. It is desirable to provide improved control over conventional fixed displacement pumps which will operate at higher efficiency and optimizes pump output flow and pressure in accordance with engine speed and engine operating conditions.
Also, current energy conservation requirements for automotive equipment, coupled with increased pump displacements for actuation of variable cam/valve timing systems, demand more efficient engine lubrication system designs.
SUMMARY OF THE INVENTION
A lubricant pumping system for providing lubrication to an engine or an apparatus having a variable speed rotating shaft. The lubricant system includes a first lubricant pump having variable displacement which is variably adjustable in response to a control input. A second fixed displacement pump is operably connected to a rotating shaft of the engine to provide a control input for adjusting pumping characteristics of the variable displacement pump to achieve a target pressure in the engine oil circuit.
REFERENCES:
patent: 2716946 (1955-09-01), Hardy
patent: 3204859 (1965-09-01), Crooks
patent: 3771921 (1973-11-01), Rohde et al.
patent: 3973881 (1976-08-01), Melchinger
patent: 4014305 (1977-03-01), Skinner et al.
patent: 4259039 (1981-03-01), Arnold
patent: 4292805 (1981-10-01), Acheson
patent: 4325215 (1982-04-01), Yamamoto
patent: 4348159 (1982-09-01), Acheson
patent: 4369743 (1983-01-01), Holt et al.
patent: 4450818 (1984-05-01), Thoma et al.
patent: 4510962 (1985-04-01), Mott et al.
patent: 4531706 (1985-07-01), Weiger et al.
patent: 4531898 (1985-07-01), Ideta
patent: 4538974 (1985-09-01), Stich et al.
patent: 4693081 (1987-09-01), Nakamura et al.
patent: 4738330 (1988-04-01), Suzuki et al.
patent: 4754738 (1988-07-01), Grohn et al.
patent: 4774918 (1988-10-01), Kurio et al.
patent: 4803969 (1989-02-01), Hiereth et al.
patent: 4974562 (1990-12-01), Ishii et al.
patent: 5017098 (1991-05-01), Hansen et al.
patent: 5067454 (1991-11-01), Waddington et al.
patent: 5085187 (1992-02-01), Black
patent: 5090881 (1992-02-01), Suzuki et al.
patent: 5195474 (1993-03-01), Urata et al.
patent: 5273020 (1993-12-01), Hayami
patent: 5315971 (1994-05-01), Yamada
patent: 5339776 (1994-08-01), Regueiro
patent: 5353753 (1994-10-01), McGrath et al.
patent: 5355851 (1994-10-01), Kamiya
patent: 5390635 (1995-02-01), Kidera et al.
patent: 5398505 (1995-03-01), Oogushi et al.
patent: 5404855 (1995-04-01), Yen et al.
patent: 5435698 (1995-07-01), Phillips
patent: 5484271 (1996-01-01), Stich
patent: 5485725 (1996-01-01), Teraoka
patent: 5490770 (1996-02-01), Oogushi
patent: 5545014 (1996-08-01), Sundberg et al.
patent: 5618165 (1997-04-01), Larsson et al.
patent: 5630383 (1997-05-01), Kidera et al.
patent: 5690479 (1997-11-01), Lehmann et al.
patent: 5752815 (1998-05-01), Müller
patent: 5800131 (1998-09-01), Lehmann et al.
patent: 5826556 (1998-10-01), Ruman et al.
patent: 5863189 (1999-01-01), Sundberg et al.
patent: 5904126 (1999-05-01), McKay et al.
patent: 5918573 (1999-07-01), Killion
patent: 5921758 (1999-07-01), Anamoto et al.
patent: 6065433 (2000-05-01), Hill
patent: 6079380 (2000-06-01), Jorgensen et al.
patent: 6131539 (2000-10-01), Thomas
patent: 6155797 (2000-12-01), Kazuyoshi
patent: 6202016 (2001-03-01), Stephenson et al.
patent: 6216651 (2001-04-01), Ishikawa et al.
patent: 6524076 (2003-02-01), Konishi
Hunter Douglas G.
Niemiec Albin J.
Borg-Warner Inc.
Dziegielewski Greg
Sayoc Emmanuel
Warn, Burgess & Hoffmann, P.C.
Yu Justine R.
LandOfFree
Variable displacement vane pump with variable target regulator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable displacement vane pump with variable target regulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable displacement vane pump with variable target regulator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3211610