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. 11, 2005
Filed:
Dec. 19, 2001
Joachim Luh, Bietigheim-Bissingen, DE;
Joachim Luh, Bietigheim-Bissingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A system (), in particular an electrohydraulic system (), for adjusting the contract pressures of a continuously variable gear, in particular a double-cone pulley belt-contact gear, which has a device for changing the gear ratio of the gear having at least one primary pressure chamber and one secondary pressure chamber is proposed. An electrically triggerable primary pressure valve (V) for adjusting the pressure in the primary pressure chamber and an electrically triggerable secondary pressure valve (V) for adjusting the pressure in the secondary pressure chamber are provided. The pressure (p) of the primary pressure chamber and the pressure (p) of the secondary pressure chamber can be carried to the secondary pressure valve (V). The object is to enable a more-accurate adjustment of the pressure (p) in the primary pressure chamber. To that end, the trigger current (I) of the secondary valve (V) is set to a value which corresponds to a predetermined pressure (p) in the primary and the secondary pressure chamber. Moreover, the pressure (p) in the secondary pressure chamber is regulated, via the trigger current (I) of the primary valve (V), so that the pressure (p) in the primary pressure chamber is established indirectly.