Piston with central valve for hydraulic brake systems

US5473896A · kind A · utility

Assignee

• ITT Automotive Europe GmbH · DE

Inventors

• Klaus Bergelin · Niedernhausen, DE
• Hans Jürgen Walther · Gerolzhofen, DE
• Harald König · Bernhardswald, DE
• Rudolf Ludwig · Neu-Isenburg, DE
• Kurt Saalbach · Mörfelden, DE
• Thomas E. Kramer · Coon Rapids, US

Key dates

• Filing date: Jan 7, 1994
• Grant date: Dec 12, 1995
• Expiry date: Jan 7, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T11/232
• WIPO field: Transport
• WIPO sector: Mechanical engineering

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).