Transmission-ratio-changer for multiple-transmission-ratio transmission arrangement
US4073204A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1975 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Nov 7, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A multiple-transmission-ratio transmission arrangement includes at least first and second transmission-ratio-establishing units, for example brake bands and/or clutches, having hydraulically activated and unactivated states and operative in the hydraulically activated state for establishing respective first and second transmission ratios. An arrangement for changing the transmission ratio of the transmission arrangement comprises, in combination, a source of hydraulic activating fluid and conduits connected to the source and to the hydraulically activatable transmission-ratio-establishing units. Electrically controllable valves in the conduits are operative for alternately permitting and preventing the supply of hydraulic activating fluid to the transmission-ratio-establishing units. An electrical transmission-ratio-selecting arrangement is connected to the valves and is operative for charging the transmission ratio of the transmission arrangement by causing the valves to effect a change of state of one of the units and an opposite change of state of the other of the units. Included is an electronic timing arrangement operative during a change of transmission ratio for delaying the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.