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:
Jan. 27, 2004
Filed:
Aug. 06, 2001
Joachim Luh, Bietigheim-Bissingen, DE;
Wilhelmus Johannes Maria Van Wijk, Udenhout, NL;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A hydraulic controller ( ) for a continuously variable transmission ( ) is proposed. Using a pump ( ), the delivery chambers ( ) of a first and second adjusting device ( ) are acted upon to alter the transmission ratio of the transmission ( ). The valve ( ), which can be controlled using a pressure drop created at a throttle position ( ), serves to control the pressure in the delivery chamber ( ). According to the invention, additional means are provided to prevent an adjustment of the transmission ( ) in the “low” direction in the (N) operating state and, as necessary, in the (P) and (N) operating states.