PURPOSE: To continue to drive a rotor drive device for relatively long period even when oil shortage is produced, by forming at least the rolling element of a bearing unit of a rotor driving device for helicopter of a ceramic, to reduce the weight of the rotor driving device for improving flight performance.
CONSTITUTION: In a rotor driving device, a total of 11 roller bearings A to K are used as shown in figure, and at least a rolling element among the parts constituting all these roller bearings A to K is formed of a sintered ceramics consisting mainly of silicon nitride or a ceramics called cyallon. In this way, when at least the rolling element is made of the ceramics among at least all the roller bearings A to K to be used for rotor driving device, a considerable amount of weight can be reduced and the flight performance of a helicopter can be increased. Also, at the weight is reduced, the centrifugal force of the rolling element in operation can be reduced and a slippage under gyroscopic moment can be prevented from being produced to stabilize high-speed rotation of the rotor.
ROKKAKU KAZUO
TAKEBAYASHI HIROAKI
| JPS6442374A | 1989-02-14 | |||
| JPS53131285A | 1978-11-15 |