The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 10, 2009
Filed:
Jun. 28, 2006
Georg Kruse, Gifhorn, DE;
Rainer Hofmann, Helmstedt, DE;
Carsten Adomeit, Hannover, DE;
Lloyd Storey, Moreton Morrell, GB;
Shaun Mepham, Saline, MI (US);
Georg Kruse, Gifhorn, DE;
Rainer Hofmann, Helmstedt, DE;
Carsten Adomeit, Hannover, DE;
Lloyd Storey, Moreton Morrell, GB;
Shaun Mepham, Saline, MI (US);
Volkswagen AG, Wolfsburg, DE;
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.