Patent ID: 6254504
Filing Date: 2001-07-03
Classification: B64C,F16H

Abstract:
A power transmission apparatus for helicopters, comprising:a traction transmission mechanism capable of generating a continuously varying speed change ratio;a coupling switching mechanism for changing over a coupling state among an input shaft, an output shaft, and the traction transmission mechanism to carry out a switching of operation mode between a variable mode, wherein the speed change ratio is varied by branching power from the input shaft into power to be transmitted to the traction transmission mechanism and into power to be joined with power from the traction transmission mechanism to be transmitted to the output shaft, and a fixed mode, wherein the speed change ratio is fixed by directly transmitting the power from the input shaft to the output shaft;a slide detecting device for detecting a slide in the traction transmission mechanism; anda switching controlling device for, when a slide is detected, switching the coupling switching mechanism from the variable mode to the fixed mode.