Shock absorber piston

US4830152A · kind A · utility

Assignee

• August Bilstein GmbH · DE

Inventors

• Max-Otto Rauert · Ennepetal, DE
• Heinrich Sporenberg · Ennepetal, DE
• Jurgen Doench · Bonn, DE
• Ewald May · Bonn, DE

Key dates

• Filing date: Nov 25, 1987
• Grant date: May 16, 1989
• Expiry date: Nov 25, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/3405
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to shock-absorber pistons which have a piston body mountable on a piston shaft, the piston body having on both faces a circumferential chamber and these chambers being covered by valve spring disks which rest on circumferential shoulders around the circumferential chambers. The piston body has counterflow channels each leading from the circumferential chamber on one face to an aperture outside the circumferential shoulder on the opposite face. In order especially to produce a degressive response to shock as speed increases, and for this purpose to lower the transit flow resistance of the piston body as much as possible, this body is provided with a flattened zone outside of the circumferential shoulder, and provided with transit channels covering the entire area of the body except for radial partitions between the channels, the transit channels extending from radially narrow circumferentially elongated arc shaped slots to circumferentially-short or radially broad trapezoidal openings into the circumferential chambers.