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. 15, 2004
Filed:
Feb. 12, 2003
Jean-Pierre Boisseau, Paris, FR;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A disk brake cylinder having a bore for retaining a piston ( ) connected by an input shaft ( ) to a parking brake mechanism. The input shaft ( ) is rotated to provide linear translation of the piston through a ball ramp mechanism to effect a parking brake application. The ball-ramp mechanism includes a first groove ( ) located on a face ( ′) of the input shaft ( ) and a second groove ( ′) located on a face ( ′) of the moving member ( ). The first ( ) and second ( ′) grooves retain and trap a plurality of balls ( ) and have escapement zones ( ′) with a convex surface that extend from a bottom ( ) of the groove ( ). The plurality of ball ( ) in a rest position are located near the bottom of the convex surface but never touch the bottom ( ) and as a result initial rotation of the input shaft ( ) provides for non linear translation of the moving member ( ) such that as the ball initially roll up the convex surface at a fast rate to take up the play in the mechanism and then moves then moves the moving member ( ) at a slower rate to effect a brake application.