Hydraulic control apparatus for automatic transmission
US7582042B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 14, 2006 |
| Grant date | Sep 1, 2009 |
| Priority date | — |
| Expiry date | Jun 17, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0253
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control apparatus for an automatic transmission comprises a linear solenoid valve for outputting a control pressure, a primary regulator valve for regulating a line pressure in accordance with the control pressure, and a secondary regulator valve for regulating a secondary pressure in accordance with the control pressure, the secondary pressure being supplied to a lock-up clutch and a torque converter. A spool of the secondary regulator valve is formed to comprise a large diameter portion and a small diameter portion, thereby eliminating the need for components such as a sleeve, and the line pressure can be input into an oil chamber formed between the large diameter portion and small diameter portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.