Shock absorber

US4893699A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Kurt Engelsdorf · Besigheim, DE
• Karl-Heinz Hagele · Lambach, DE
• Bernd Taubitz · Schwieberdingen, DE
• Quang N. Tran · Marseilles, FR
• Peter Zieher · Eberdingen, DE

Key dates

• Filing date: Mar 25, 1988
• Grant date: Jan 16, 1990
• Expiry date: Mar 25, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86791
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A shock absorber useful in motor vehicles which includes a piston inside of which an entire quantity of a damping fluid exchanged between two work chambers flows via a throttle cross section the size of which is defined by an electromagnetic adjusting device comprising primarily a magnet coil and an armature. The armature is annular and merges with an annular control slide provided with a slide control edge, which slide, in cooperation with a piston control edge on the piston determines the size of the throttle cross section. The control slide and armature are statically in pressure equilibrium, and because of their annular embodiment they have only a slight weight of their own, so that the shock absorber operates with short adjusting times. By way of a defined profile of the slide control edge or piston control edge, certain damping characteristics are attainable.