Hydraulic amplifier

US4379423A · kind A · utility

Assignee

• Volkswagenwerk AG · DE

Inventors

• Gunther Leineweber · Gifhorn, DE
• Rolf Warnecke · Ulmen, DE

Key dates

• Filing date: Jan 19, 1977
• Grant date: Apr 12, 1983
• Expiry date: Jan 19, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/144
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic amplifier having a housing provided with pressure and return conduits, an amplifier piston, and a control slide. The piston is slidably arranged in an axial bore of the housing and itself has a blind axial bore within which the control slide is arranged. The piston and slide together constitute a unit which is free of pressure equalization and which is provided with two sets of passages for selectively placing the face of the piston in communication with the pressure and return conduits, respectively, depending on the axial position of the slide in the blind bore of the piston. The passages are asymmetrical with respect to the peripheral surface of the slide and are so constructed and arranged that whichever set of passages is closed, the slide is pressed radially against the closed passage under the influence of certain pressure differences which prevail in the hydraulic amplifier. This makes it possible to construct the component parts of the hydraulic amplifier with relatively coarse tolerances.