Lube regulated pressure regulator valve
US6712726B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Oct 1, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7842
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.