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. 17, 2004
Filed:
Dec. 18, 2002
Maura Jane Stafford, Warner Robins, GA (US);
Scott C. Jackson, Chester, VT (US);
Sonnax Industries, Inc., Bellows Falls, VT (US);
Abstract
A self-regulating reverse boost valve assembly for installation within the hydraulic pump of an automatic transmission is disclosed. The present reverse boost valve assembly operates in conjunction with the pressure regulator valve to control line pressure generated by the hydraulic pump boosting line pressure in relation to engine torque. The present reverse boost valve assembly includes an internal check valve mechanism that is actuated whenever torque signal fluid pressure (proportional to engine torque) exceeds a predetermined level. When the internal check valve mechanism is actuated, the excess torque signal fluid pressure is diverted via an internal exhaust channel to the transmission sump. Thus, any drastic rise in main line hydraulic pressure or high line pressure in reverse gear, which can result in broken direct clutch drums and/or broken transmission cases, is prevented.