Patent ID: 6866346
Filing Date: 2005-03-15
Classification: B60T,Y10T

Abstract:
1. An actuating device for a brake unit of an electronically controlled vehicle brake system, the actuating device comprising a tappet constructed and arranged (i) for positioning in axially displaceable relationship in a housing of the brake unit of the electronically controlled brake system of a vehicle, (ii) for actuating a piston to operate a brake valve of said brake unit, and (iii) for mechanical connection to a brake pedal of said vehicle, said tappet including in axial direction a cylindrical attachment having a shell and a bottom, said bottom including a plurality of spaced-apart holes, said shell having an outer surface including a radial circumferential groove defined thereon, said groove including openings corresponding substantially in height to said spaced-apart holes, a displacement sensor slide movable with said tappet for measuring axial movement of said tappet, a spacer ring disposed inside said cylindrical attachment of said tappet between said tappet and said piston for providing a preselected amount of lost motion, said spacer ring including a plurality of tongues extending therefrom into said spaced-apart holes, and a guide ring disposed in said groove, said guide ring having an inner surface including raised portions which extend into said openings and an outer surface including a window protruding radially outwardly through an individual one of said openings in said groove and into a guide slit defined in said housing for receiving an end of said displacement sensor slide.