Valve adjustment arrangement and process for a tandem piston master cylinder

US5161376A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventor

• Willi Hartmann · Lemberg, DE

Key dates

• Filing date: Jun 10, 1991
• Grant date: Nov 10, 1992
• Expiry date: Jun 10, 2011

Classification

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

Abstract

An arrangement and process for adjusting a supply valve closing in a tandem piston master cylinder is disclosed. The tandem piston master cylinder includes a piston stroked by engagement with an operating rod and a spaced floating piston driven by an interposed return spring, the floating piston captured by the rod engaged piston during the return stroke by a headed screw abutting a projection at the end of a bore within the screw head moves during relative movement between the pistons. Supply valves are opened and closed by the position of each piston. The piston relative positions are adjusted to achieve proper supply valve closing by rotation of the rod engaged piston while fixing the floating piston against rotation which rotates the screw thread which also slightly varies the precompression of the return spring. This adjustment selectively controls the point of closing of the supply valve associated with the floating piston relative the position of the rod operated piston. Pressurized air is used to detect supply valve opening and closing during the adjustment process.