Fluid friction clutch

US4967889A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventor

• Arndt Ihlemann · Herzogenaurach, DE

Key dates

• Filing date: Dec 15, 1988
• Grant date: Nov 6, 1990
• Expiry date: Dec 15, 2008

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D35/022
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The fluid friction clutch has a clutch cover mounted rotatably in relation to a rotatingly driven input shaft, which cover is divided by a partition into a reservoir for shear fluid and a working chamber. In the working chamber there is arranged a rotor driven in rotation by the input shaft, which rotor together with the partition and the cover defines shear gaps. A valve device controls the inflow of shear fluid in the working chamber. From the internal circumference of the working chamber a baffle body of the cover protrudes inwards into an annular chamber between the internal circumference and the external circumference of the rotor. Behind the baffle body in the drive direction of rotation of the rotor, a transfer opening is provided in the partition. On the side of the baffle body facing the rotation axis (1) an elevated portion of the partition adjoins, which constricts the shear gap between the partition and the rotor. In the circumferential direction the elevated portion overlaps with the transfer opening and prevents the shear fluid built up by the baffle body from flowing radially inwards into the shear gap. The elevated portion increases the pump performance of the baffl…