The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 27, 1978
Filed:
Feb. 23, 1976
Oswald Webb, Coventry, EN;
GKN Transmissions Limited, Birmingham, EN;
Abstract
A control coupling, particularly for use with a differential gearing, the coupling including an enclosure containing a viscous liquid and first and second mutually interleaved sets of annular plates arranged for rotation about a common axis within the enclosure. The first set of plates are arranged to be connected with a first rotatable member and the second set of plates being arranged to be connected with a second rotatable member, and the plates of at least one set are free to move in directions parallel to the common axis. One of the sets of plates are mounted on a hollow hub which projects within the enclosure and which has a bore which is open to, and forms part of, the enclosure volume. A piston is slidable in this bore to vary the volume of the enclosure and springs are located in the bore to urge the piston towards a limit position in which the volume of the bore in communication with the remainder of the enclosure is at a minimum. The piston is displaceable against the spring, in response to increases in liquid pressure in the enclosure, to increase the volume of the enclosure.