US 5,473,896 A · Piston with central valve for hydraulic brake systems

Abstract

The present invention relates to a piston with a central valve, in particular for hydraulic boosters, the valve case (6) which is composed of a supporting insert (8) radially embraced by a valve seat (7). It is disadvantageous in some valve cases that sometimes the positive coupling between the two elements in axial direction is not sufficient. The present invention provides a remedy to this problem by using undercuts behind which the valve seat engages the supporting insert in both directions. In an advantageous improvement, the valve insert is of symmetrical design, and a sealing projection is shaped at the valve seat. The guidance of the valve tappet (19) is performed within the piston (1).

Claims20

Dependent claims

A piston with a central valve, a cavity formed in said piston and open at a first piston end, and a central duct formed in said piston between said cavity and a second piston end for use in hydraulic vehicle brake systems, comprising:

a valve disposed within said piston adjacent a first end of said central duct having a rigid supporting insert and an annular elastic valve seat which abuts at least on a peripheral surface of an annular collar of said supporting insert, said collar having two end surfaces enclosed by said valve seat wherein said valve seat includes an annular projection disposed on one end of said valve seat toward said central valve.

Dependencies are inferred from the claim text.

Piston with central valve for hydraulic brake systems

Life of this patent

Piston with central valve for hydraulic brake systems

Life of this patent

Abstract

Claims20