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. 20, 2004
Filed:
Dec. 21, 2001
Maurice Didier Rienks, Eindhoven, NL;
Engbert Spijker, Helmond, NL;
Van Doorne's Transmissie BV, Tilburg, NL;
Abstract
A control system for a continuously variable transmission provided with a first pulley ( ) having two pulley discs ( ), with a second pulley ( ) having two pulley discs ( ) and with a drive belt ( ) wound around said pulleys ( ) for transmitting torque there between, at least one disc ( ) of the first pulley ( ) being axially movable with respect to the other disc ( ) of the pulley ( ) under the influence of an axial force provided on the movable disc ( ) by a line pressure (P ) in a cylinder ( ) of a piston/cylinder assembly ( ) associated with the the first pulley ( ) and at least one disc ( ) of the second pulley ( ) being axially movable with respect to the other disc ( ) of the pulley ( ) under the influence of an axial force provided on the movable disc ( ) by a second cylinder pressure (P ) in a cylinder ( ) of a piston/cylinder assembly ( ) associated with the the second pulley ( ). The control system is arranged to control the second cylinder pressure (P ) between two pressure levels (P ; P ) by a second valve ( ) that may be influenced not only by a control pressure (P ), but also by the second cylinder pressure (P ).