Patent ID: 9670837
Date: 2017-06-06
CPC Classifications: F01P,F02B,F02D,F02M,F02P

Claim:
1. An engine-powered work tool comprising: an air-cooled engine including a crank shaft configured to rotate and a cooling fan fixed to the crank shaft and configured to rotate together with the crank shaft to generate cooling air; an ignition system for igniting the engine; an output controller configured to control an output of the engine, the output controller including a throttle valve shaft defining an axis and configured to make an angular rotation about the axis, the output of the engine being controlled based on the angular rotation of the throttle valve shaft; a wind governor connected to the throttle valve shaft and including a governor plate configured to move upon receipt of the cooling air thereon, the wind governor being configured to control the angular rotation of the throttle valve shaft based on an amount of the cooling air received by the governor plate; a rotation speed detector configured to detect a rotation speed of the crank shaft; and an ignition control unit configured to control the ignition system based on the rotation speed of the crank shaft detected by the rotation speed detector to reduce the output of the engine when the rotation speed detector determines that the governor plate exceeds a predetermined position.