公开(公告)号：EP0861776B1

公开(公告)日：2002-11-27

申请号：EP97118254.8

申请日：1993-06-18

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： Hanson, Bruce D. ,  Kohlhepp, Frederick W. ,  Millea, Vincent F. ,  Cycon, James P.

IPC: B64C27/12 ,  B64D35/04

CPC classification number: B64C27/10 ,  B64C27/14 ,  B64C27/20 ,  B64C27/33 ,  B64C27/605 ,  B64C39/024 ,  B64C2201/027 ,  B64C2201/044 ,  B64C2201/108 ,  B64C2201/127 ,  B64C2201/146 ,  B64C2201/162 ,  F02B2075/025 ,  F16D3/06 ,  F16D3/185

公开(公告)号：EP0861776A1

公开(公告)日：1998-09-02

申请号：EP97118254.8

申请日：1993-06-18

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： Hanson, Bruce D. ,  Kohlhepp, Frederick W. ,  Millea, Vincent F. ,  Cycon, James P.

IPC: B64C27/12 ,  B64D35/04

CPC classification number: B64C27/10 ,  B64C27/14 ,  B64C27/20 ,  B64C27/33 ,  B64C27/605 ,  B64C39/024 ,  B64C2201/027 ,  B64C2201/044 ,  B64C2201/108 ,  B64C2201/127 ,  B64C2201/146 ,  B64C2201/162 ,  F02B2075/025 ,  F16D3/06 ,  F16D3/185

Abstract: A drive train assembly (60) for an unmanned aerial vehicle (10) for coupling torque from an engine (54) to a transmission (110) of a rotor assembly (100) having ducted, coaxial counter-rotating rotors (200, 202), comprising:

an engine coupling subassembly (63);
a drive shaft (72); and
a transmission coupling subassembly (74);
said transmission coupling subassembly (74) including an external crown spline coupling (76) mechanically connected to one end of said drive shaft (72) by means of a pin-collar connector (75), and a gear spline coupling (77) in meshing engagement with said external spline coupling (76);
said engine coupling subassembly (63) including an internal spline coupling (68) mechanically connected to the other end of said drive shaft (72) by means of a pin-collar connector (69), and an external crown spline coupling (67) in meshing engagement with said internal spline coupling (68) through complementary spline teeth (67T, 68T);
   characterized in that
said engine coupling subassembly (63) further includes a bundt pan (65) that transmits torque from the engine (54), a sprag clutch (62) and ball bearings (66);
said sprag clutch (62) being rigidly centered intermediate said bundt pan (65) and said external crown spline coupling (67) by means of said ball bearings (66);
   wherein torque from the bundt pan (65) is coupled through the sprag clutch (62) to the external crown spline coupling (67), which in turn couples the torque to the drive shaft (72) via said internal spline coupling (67) due to the meshing between the complementary spline teeth (67T, 68T) of said internal spline coupling (67) and said external crown spline coupling (68).