Shock absorber

US4765445A · kind A · utility

Assignee

• Korber AG · DE

Inventors

• Werner Komossa · Bornsen, DE
• Peter Brand · Hatfield, GB

Key dates

• Filing date: Mar 26, 1987
• Grant date: Aug 23, 1988
• Expiry date: Mar 26, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/46
• 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 interior of the cylinder into two chambers. The chambers are connectable to each other by way of several passages including a first set for permitting the flow of damping fluid from one chamber into the other chamber through a first one-way valve in response to movement of the piston rod into the cylinder, and a second set of passages which permit the fluid to flow from the other chamber into the one chamber in response to extraction of the piston rod from the cylinder. The piston is further formed with several bypass channels which are adjacent one another and wherein the flow of fluid between the two chambers (either directly or by way of selected passages) is regulated by cores which are movable axially in response to energization of inductance coils or in response to dissipation of energy by springs. The number of energized coils determines the rate of fluid flow by way of one or more bypass channels to thus influence the damping characteristic of the shock absorber.