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:
Jun. 21, 2005
Filed:
Feb. 08, 2002
Cornelius Peter, Bühl, DE;
Cornelius Peter, Bühl, DE;
TRW Automotive Electronics & Components GmbH & Co. KG, Radolfzell, DE;
Abstract
A park brake system for vehicles is provided that has an actuator with an electric drive motor () and an electronic control unit. A reduction gear has an input connected to the output of the electric motor and a pull force output member () for connection to mechanical brakes of the vehicle. The reduction gear has an input connected to the output of the electric motor. A command unit is connected to the electronic control unit. The reduction gear comprises a first reduction train and a second reduction train. The first reduction train includes a worm gear () and the second reduction train includes a threaded spindle () and a screw nut () engaged with the spindle (). The worm gear connects the spindle () to the output of the electric motor (). The pull force output member () is connected to the screw nut (). The two-step reduction gear ensures the required high rate of reduction to generate high pull forces with a relatively compact electric motor. The worm gear used in the first reduction train has a high efficiency, and the threaded spindle and screw nut in the second reduction train allow for a self-locking feature.