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:
Mar. 30, 2004
Filed:
Oct. 01, 2002
Scott C. Jackson, Chester, VT (US);
Robert C. Warnke, Spooner, WI (US);
Sonnax Industries, Inc., Bellows Falls, VT (US);
Abstract
A Lube Regulated Pressure Regulator Valve including an internal check valve that passes transmission fluid from the hydraulic pump in an amount sufficient to fill the torque converter in the Park gear range and at low engine speeds is disclosed. The internal check valve opens at a substantially lower line pressure than is required to open the original equipment manufacture pressure regulator valve to ensure the torque converter is operational at engine startup. As engine speed increases and sufficient line pressure builds up within the torque converter charge circuit, the internal check valve is closed and the pressure regulator valve opens as it would normally to feed line pressure to the torque converter directly. When the engine is shut off, the internal check valve is biased to a closed position preventing automatic transmission fluid from draining back from the torque converter through the pressure regulator valve to the fluid sump.