Hydraulic shock absorber

US4926983A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernd Taubitz · Schwieberdingen, DE
• Peter Zieher · Eberdingen, DE
• Claus Kramer · Besigheim, DE
• Kurt Engelsdorf · Besigheim, DE
• Armin Schuelke · Schwieberdingen, DE

Key dates

• Filing date: Jan 24, 1989
• Grant date: May 22, 1990
• Expiry date: Jan 24, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86734
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A hydraulic shock absorber with automatically adjustable damper force which actuates an electromagnetic rotary adjuster for a control slide that monitors a sole flow cross section. The rotary adjuster is embodied as a permanently excited single-winding rotary adjuster, and because of its permanent magnetic poles in the rotor, even when it is currentless it furnishes a torque that assures safety resetting of the rotary adjuster if the current fails. The hydraulic shock absorber is intended for controlling the undercarriage of a motor vehicle.