Hydraulic control apparatus for automatic transmission
US7951034B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2008 |
| Grant date | May 31, 2011 |
| Priority date | — |
| Expiry date | Dec 9, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/686
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a condition of a vehicle which remains stationary or is about to stop and of a forward second speed having a clutch and a brake engaged, an N range is changed from a D range based on a shift lever operation and a forward range pressure is discharged from a manual shift valve. At this time, an orifice and a check ball are used to delay discharge of oil paths which communicate with a linear solenoid valve relative to discharge of an oil path a1 which communicates with a linear solenoid valve. Specifically, release of the brake is delayed relative to release of the clutch, so that a shift by way of a forward first speed through engagement of a one-way clutch can be prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.