Warm-up promotion device for automatic transmission
US4680928A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 1983 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jun 27, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An automatic transmission has a torque convertor, an inlet passage connecting between an oil inlet of the torque convertor and an outlet of a hydraulic pump driven by an engine, and an outlet passage connecting between an oil outlet of the torque convertor and an oil tank, the outlet passage being provided at its intermediate portion with an oil cooler. The warming up of the transmission after start up in a cold state is promoted by a warm-up promotion device which comprises a by-pass passage branched from the outlet passage at a portion upstream of the oil cooler and leading to the oil tank, and a by-pass valve associated with the by-pass passage and adapted to open the by-pass passage during warming up of the automatic transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.