Unbalanced hydraulic amplifier valve assembly

US4516470A · kind A · utility

Assignee

• Volkswagenwerk AG · DE

Inventors

• Rolf Warnecke · Ulmen, DE
• Heinz Ruhmer · Wolfenbüttel, DE
• Gunter Leineweber · Gifhorn, DE

Key dates

• Filing date: Jun 17, 1981
• Grant date: May 14, 1985
• Expiry date: Jun 17, 2001

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/12
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

An unbalanced hydraulic valve assembly includes a first plunger element slidably and transversely displaceably received in a second plunger element wth a loose fit; a work chamber; a pressure supply conduit provided in the valve assembly for introducing pressurized hydraulic fluid thereinto; a control port arrangement in one of the plunger elements in an asymmetrical relationship relative to the circumference of the plunger elements. The control port arrangement permits or blocks flow from the pressure supply conduit to the work chamber dependent upon the relative axial position between the plunger elements. A force transmitting member is supported in the second plunger element for displacement transversely to the direction of relative axial motion between the plunger elements. The force transmitting member engages the first plunger element and is exposed to pressurized hydraulic fluid for pressing the first plunger element against an inner wall face of the axial bore provided in the second plunger element. The first plunger element and the second plunger element are free from annular seals between themselves.