Double-tube vibration damper unit

US4609082A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Hermann Itzinger · Dittelbrunn, DE
• Werner Christel · Diez, DE

Key dates

• Filing date: Jun 20, 1984
• Grant date: Sep 2, 1986
• Expiry date: Jun 20, 2004

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16F9/3242
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

In a double-tube vibration damper the cylinder engages by a terminal edge thereof an engagement face of a piston rod guiding and sealing unit. When the piston rod moves in the outward direction with respect to the cylinder, a high pressure occurs in the working chamber adjacent the piston rod guiding and sealing unit. Due to this high pressure damping liquid jets may escape between the terminal edge of the cylinder and the engagement face of the piston rod guiding and sealing unit. These liquid jets may cause foaming within the annular space defined between the cylinder and a container surrounding the cylinder. In view of avoiding such foaming, an annular cover member is provided between the cylinder and the container, which annular cover member prevents the direct entrance of liquid jets into the annular space between the cylinder and the container. This annular cover member is situated such that it extends across the plane of engagement defined by the terminal edge of the cylinder and extends perpendicular with respect to the axis of the cylinder.