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:
Aug. 31, 1999
Filed:
Dec. 09, 1997
Douglas L Darling-Owen, Dummerston, VT (US);
Scott C Jackson, Bellows Falls, VT (US);
Sonnax Industries, Inc., Bellows Falls, VT (US);
Abstract
A replacement mechanism or servo assembly for applying a band to an input member of an automatic transmission includes a housing in which an apply piston is located and to which an apply pin is connected. The piston is sealably movable in the housing and includes a major piston member having a first distal reaction face and a minor piston member integral with the major piston and having a second distal reaction face. A pressure fluid distribution device applies a working fluid against both of the first distal reaction face and the second distal reaction face in order to move the piston with the resultant force of the pressures on both reaction faces and to cause the apply pin to move toward the band to compress the band about the input member with this resultant force. In a preferred embodiment, the housing further includes a pressure separator immovably disposed between the first distal reaction face and an adjacent second proximal face of the minor piston member. The pressure fluid distribution device includes a first passageway between the pressure separator and the housing by which fluid pressure applied against the second distal reaction face is also applied against the first distal reaction face, and a relief distribution device which includes a second passageway between the major piston and the minor piston by which a relief pressure provided against the second proximal face is also provided against the first proximal face.