초록 ▼

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

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.

대표청구항 ▼

A multi-range starter-generator drive connected between a variable speed engine and a generator, comprising: a first shaft drivingly coupled to the variable speed engine, a second shaft drivingly coupled to the generator to be driven at constant speed, a controllable hydro-viscous dissipative clutch

A multi-range starter-generator drive connected between a variable speed engine and a generator, comprising: a first shaft drivingly coupled to the variable speed engine, a second shaft drivingly coupled to the generator to be driven at constant speed, a controllable hydro-viscous dissipative clutch having a movable control member said hydro-viscous clutch being operatively connected to said shafts controllable for constant speed drive of the second shaft and the generator with the engine operating at variable speeds, and plural drive output means interposed between said first shaft and said clutch providing different drive ratios between said engine and said clutch to achieve a more nearly constant speed input to said clutch over the entire range of engine spees.