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:
Dec. 30, 2003
Filed:
Aug. 23, 2001
Bernd Fessler, Kressbronn, DE;
Friedrich Reiter, Kressbronn, DE;
ZF Batavia L.L.C., Batavia, OH (US);
Abstract
The invention concerns an oil supply system for an automatic transmission of a motor vehicle having one hydrodynamic starting element. It has one oil pump ( ) to convey oil to a variator ( ) and/or to shifting elements ( ), to a converter unit ( ) that can be supplied with oil via two oil lines ( ), especially a hydrodynamic torque converter ( ) having a converter lock-up clutch ( ), and to a lubrication device ( ), the same as at least one filter device ( ) and one oil cooling device ( ). Here are provided one prioritized primary circuit ( ) with a main pressure adjusted by a main pressure valve ( ) for pressure supply of the variator ( ) and/or of the shifting elements ( ) and a secondary circuit ( ) for oil supply of the lubrication device ( ). It is proposed according to the invention that the converter unit ( ) be tied to the primary circuit ( ) and to the secondary circuit ( ) so that the converter lock-up clutch ( ) be supplied with a minimum pressure required for torque transmission via the primary circuit ( ) parallel to the supply of the lubrication device ( ) via the secondary circuit ( ) when on the converter lock-up clutch ( ) a closing or slipping state is adjusted and that otherwise the converter unit ( ) is supplied with oil via the secondary circuit ( ).