Multi-range starter-generator drive
US4708030A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1985 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Mar 18, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D35/005
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A starter-generator drive usable in an aircraft must be of the smallest possible size and the lowest possible weight and have maximum reliability. A drive having a multi-speed transmission and a controllable hydro-viscous dissipative clutch can be interposed between an engine and a starter-generator to achieve maximum efficiency in the drive and meets the foregoing objectives. The starter-generator drive has a multi-speed transmission for stepping the input speed from an engine to a hydro-viscous dissipative clutch to provide plural speed ranges of operation and thus limit the amount of slip that occurs within the clutch in each range to provide the constant speed drive of the generator. The dissipative clutch operates in a hydro-viscous manner whereby sudden changes of speed, as the multi-speed transmission shifts, do not vary the torque transmitted to the generator and therefore the speed of the generator. This avoids transients in the output power frequency of the generator during ratio changing of the multi-speed transmission. The starter-generator drive also provides for dissipative engine start utilizing the generator as an electric motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.