192 clutches and power-stop control – Elements – Lubricating – insulating – or cooling
Reexamination Certificate
2006-06-28
2009-02-10
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Elements
Lubricating, insulating, or cooling
C192S048800, C192S070120
Reexamination Certificate
active
07487866
ABSTRACT:
A hydraulic circuit for a motor vehicle transmission, preferably a twin-clutch transmission, is connected for cooling at least one clutch of the transmission. The hydraulic circuit is preferably a low-pressure circuit and it includes at least one hydraulic pump, at least one filter element, for filtering the hydraulic oil, and at least one pressure-regulating valve. The circuit-related control sequence and the power consumption of the hydraulic pump are optimized in that at least one adjusting valve is provided in order to control the volume flow of cooling oil flowing to the clutch, in that a pressure-compensation valve is provided in addition, and in that the pressure-regulating valve, the adjusting valve and/or the pressure-compensation valve are arranged and/or formed within the hydraulic circuit such that the pressure difference between the supply pressure and the establishing cooling-oil pressure is essentially constant.
REFERENCES:
patent: 6361287 (2002-03-01), Hopper
patent: 6631651 (2003-10-01), Petrzik
patent: 6715597 (2004-04-01), Buchanan et al.
patent: 198 57 222 (2000-06-01), None
patent: 101 47 123 (2002-04-01), None
patent: 103 27 406 (2005-02-01), None
Adomeit Carsten
Hofmann Rainer
Kruse Georg
Mepham Shaun
Storey Lloyd
Lorence Richard M.
Volkswagen AG
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