Adjustable vibration damper

US4880086A · kind A · utility

Assignee

• Boge GmbH · DE

Inventors

• Heinz Knecht · Eitorf, DE
• Norbert Ackermann · Eitorf, DE

Key dates

• Filing date: Jun 6, 1988
• Grant date: Nov 14, 1989
• Expiry date: Jun 6, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/465
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

Adjustable vibration damper, in particular for motor vehicles, with a cylinder containing a damping fluid, an axially-movable piston rod inserted in the cylinder in a sealed manner, and a damping piston fastened to the piston rod, which piston divides the cylinder into two work chambers, whereby a damping valve with an axially-movable valve body and a valve seat controls the effective cross section of a damping passage. Control of such a vibration damper should guarantee a continuous adjustment capability, a high adjustment speed, a good temperature behavior and reliably reproducible damping force characteristics, as well as the use of a small amount of control energy. For this purpose, starting from its pressurized end surface, the valve body comprises at least one constant throttle hole running toward the opposite rear side, and another throttle hole running from the rear side in the discharge direction of the damping passage is controlled by a continuously adjustable control pin, whereby the rear side of the valve body and the housing guiding the valve body form a control chamber.