Hydraulic control apparatus for automatic transmission
US7261674B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2005 |
| Grant date | Aug 28, 2007 |
| Priority date | — |
| Expiry date | Nov 26, 2025 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/0481
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A hydraulic control apparatus for an automatic transmission provided with a friction engaging element that operates using hydraulic pressure includes a range pressure oil passage which is connected to the friction engaging element; a manual valve which is connected to the range pressure oil passage; a drain port which is formed in the manual valve and which drains hydraulic pressure of the range pressure oil passage; a drain oil passage which is connected to the drain port; and a drain pressure controller which is connected to the drain oil passage and which performs control so as to change a decreasing rate of drain pressure of the drain oil passage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.