Shock absorber

US4974707A · kind A · utility

Assignee

• Korber AG · DE

Inventors

• Helmut Neumann
• Werner Komossa · Bornsen, DE

Key dates

• Filing date: Oct 30, 1989
• Grant date: Dec 4, 1990
• Expiry date: Oct 30, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/87507
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A shock absorber with a variable damping characteristic has a piston which is reciprocable in a cylinder to divide the oil-filled internal space of the cylinder into two chambers. The chambers are connectable to each other by one or more passages so that oil can flow between the chambers in response to movement of the piston relative to the cylinder and/or vice versa. The piston has several bypasses each of which is controlled by an adjustable electrically operated regulating valve. In order to enhance the accuracy of regulation of flow of oil between the chambers by way of the bypasses, the piston is formed with channels which supply oil between the mobile valving elements and the seats of the valves to thus reduce or eliminate friction between such parts. The films of oil between the valving elements and the respective seats from hydrostatic bearings which ensure that the valving elements can leave their open or closed positions, as well as that the valving elements can move between such positions, with a high degree of predictability and faster than in heretofore known regulating valves. The valving elements can be disposed one behind the other in the axial direction of the pist…