| US 7,487,866 B2 | ||
| Hydraulic circuit for a transmission of a motor vehicle | ||
| Georg Kruse, Gifhorn (Germany); Rainer Hofmann, Helmstedt (Germany); Carsten Adomeit, Hannover (Germany); Lloyd Storey, Moreton Morrell (United Kingdom); and Shaun Mepham, Saline, Mich. (US) | ||
| Assigned to Volkswagen AG, Wolfsburg (Germany) | ||
| Filed on Jun. 28, 2006, as Appl. No. 11/476,285. | ||
| Claims priority of application No. 10 2005 029 964 (DE), filed on Jun. 28, 2005. | ||
| Prior Publication US 2007/0020119 A1, Jan. 25, 2007 | ||
| Int. Cl. F16D 13/72 (2006.01); F16D 21/00 (2006.01) | ||
| U.S. Cl. 192—113.3 [192/48.8; 192/70.12] | 16 Claims |
| 1. A hydraulic circuit for cooling at least one clutch of a transmission of a motor vehicle, comprising:
at least one hydraulic pump;
at least one filter element for filtering hydraulic oil communicating with said at least one hydraulic pump;
at least one pressure-regulating valve communicating with said hydraulic pump;
at least one adjusting valve disposed to control a volume flow of cooling oil flowing to the clutch; and
a pressure-compensation valve;
wherein at least one of said pressure-regulating valve, said adjusting valve, and said pressure-compensation valve are configured
within the hydraulic circuit to maintain a substantially constant pressure difference between a supply pressure and a resulting
cooling-oil pressure.
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