Patent Number: 6,254,504

Title: Power transmission apparatus for helicopter

Abstract: In a variable mode of operation in which clutches are locked and a clutch and a brake are unlocked, the power of an input shaft is branched to a traction transmission mechanism. By contrast, in a fixed mode of operation in which the clutches are unlocked and the clutch and the brake are locked, the power of the input shaft is not branched to the traction transmission mechanism. In this way, the fixed mode and the variable mode are selectively used, whereby noise reduction and enhanced fuel efficiency can be attained. According to this configuration, it is possible to provide a power transmission apparatus for helicopters in which the number of rotations of a main rotor or a tail rotor is continuously varied while maintaining the number of rotations of an engine constant.

Inventors: Goi; Tatsuhiko (Kakamigahara, JP), Kawakami; Kouji (Kakamigahara, JP), Yamakawa; Eiichi (Kakamigahara, JP)

Assignee: Advanced Technology Institute of Commuter-Helicopter, Ltd.

International Classification: B64C 27/14 (20060101); B64C 27/00 (20060101); F16H 37/06 (20060101); F16H 37/08 (20060101); F16H 037/02 ()

Expiration Date: 07/03/2018