Shock absorber with increasing damping force

US8955654B2 · kind B2 · utility

Assignee

• Ohlins Racing AB · SE

Inventors

• Nils Göran Nygren · Huddinge, SE
• Magnus Danek · Upplands Väsby, SE
• Johan Jarl · Stockholm, SE

Key dates

• Filing date: Dec 10, 2008
• Grant date: Feb 17, 2015
• Expiry date: May 22, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/49
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A vehicle shock absorber generates an additional counter-force acting counter to the direction of movement near the limit position of movement. The shock absorber substantially comprises a damping medium-filled damping cylinder that is divided into two damping chambers by a main piston. The main piston is axially moveable relative to the damping cylinder and is attached to a piston rod. A second piston/damping piston that contains one or more first and second through-ducts is mounted to the piston rod. The ducts are defined by first and second flow-limiting devices such as multiple thin washers. The damping piston slides in a restricting space located in the damping cylinder. The restricting space has an inside diameter smaller than the inside diameter of the damping cylinder. The additional counter-force is substantially constant throughout the entire stroke in order to create gentle braking of the damping movement.