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:
Mar. 29, 2005
Filed:
Mar. 24, 2001
Georg Gierer, Kressbronn, DE;
Georg Gierer, Kressbronn, DE;
ZF Freidrichshafen AG, Friedrichshafen, DE;
Abstract
The invention relates to a parking brake system for transmissions of motor vehicle, especially for an automatic transmission and an automated selector transmission, having one parking brake for blocking or releasing the transmission according to actuation signals of a control device, especially by a pawl engaging and disengaging in a parking brake gear connected with the output of the transmission, an electric operative connection between the control device in the interior of the motor vehicle and the parking brake, a spring accumulator () for actuating the parking brake and a pressure-controlled release device of the parking brake. It is proposed to load the release device () when releasing the parking brake with a negative pressure independent of the transmission and which is preferably taken from the suction system () of the internal combustion engine of the motor vehicle or from a negative pressure brake force booster of the motor vehicle.