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:
Dec. 13, 1994
Filed:
Jun. 24, 1993
Applicant:
Inventors:
Edwin J Waterbury, Plymouth, MI (US);
Scott R Crandall, Wixom, MI (US);
Assignee:
Ford Motor Company, Dearborn, MI (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F16H / ;
U.S. Cl.
CPC ...
192-33 ; 747321 ;
Abstract
In a circuit for controlling the engaged and disengaged state of a torque converter lockup clutch 54 supplied with pressurized fluid on alternate side of a clutch piston, a first valve 116 regulating magnitude of pressure in a lock circuit 104, 106, 124, which causes the lockup clutch to engage, and maintains a pressure differential between lock pressure and unlock pressure, which causes the lockup clutch to disengage. A shuttle valve 122, supplied with control pressure from a solenoid-operated valve 94 when the lockup clutch is engaged, prevents fluid at lock pressure venting from the lock circuit.