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:
May. 10, 2005
Filed:
Apr. 15, 2000
Andreas Piepenbrink, Meersburg, DE;
Bernd Fessler, Kressbronn, DE;
Wolfgang Runge, Ravensburg, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A continuously variable transmission for a motor vehicle, possessing a variator (') with a primary V-pulley set (′) and a secondary V-pulley set (′). In this arrangement are a primary V-pulley disk (′) and a secondary V-pulley disk (′), which are axially slidable by hydraulic force for the controlled adjustment of a pressure can be, respectively, loaded with an oil flow through an electro-hydraulically controlled pressure supply apparatus (′). The pressure supply apparatus (′) is so designed, that the oil flow is brought to the V-pulley disks (′) through a pressure line (′) with at least one pressure controller (′) and one pressure chamber (′) with a variable volume (VV). The pressure chamber (′) of the primary V-pulley disk (′) can be connected to a primary chamber′) of the cylinder (′), and the pressure chamber (′) can be connected with a secondary chamber (′) of said cylinder (′), in which, between the primary chamber (′) and the secondary chamber (′) a double action, reversible piston (′) is placed for directing pressurized oil from a low pressure side to a high pressure side of the variator (′) upon the shifting of said variator (′).