| 摘要 |
A drive unit for a wheel of an airplane landing gear includes a pneumatic motor having a first impeller which is driven by pneumatic energy of compressed air and a second impeller which is turned by the expanded exhaust from the first impeller. These impellers are fixed to the wheel axle and turn together with a third impeller within an air-tight casing. A fixed vane is provided between the second and third impellers. The pneumatic motor has two functions, (1) as a pneumatic motor which is turned by the pneumatic energy of compressed air and, (2) as a vacuum brake, creating a vacuum within the airtight casing by closing the inlet for the compressed air and driving the impellers by the power of the turning wheel of the landing gear, driven by ground contact upon landing.
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