Patent ID: 7332838

Claim:
A motor-fan assembly for use in a combustion-type power tool, comprising: a motor having a shaft that extends in a first direction and outputs rotational force; a fan having a hub portion which is formed with a center hole; and a connection rod that connects the shaft of the motor to the fan, the connection rod having an imaginary longitudinal axis extending in the first direction, wherein a cross-section of the shaft of the motor and the connection rod cut along the imaginary longitudinal axis is symmetrical in shape with respect to the imaginary longitudinal axis, wherein the connection rod is formed with a hole in coaxial with the imaginary longitudinal axis, and the shaft of the motor is inserted into the hole of the connection rod, and a first and a second tightening member, each being engageable with the connection rod, wherein the connection rod is inserted into the hole of the hub and the fan is secured to the connection rod by the first tightening member engaged with the connection rod at one side of the hub portion and the second tightening member engaged with the connection rod at another side of the hub portion, wherein the connection rod and the first and the second tightening members are made from a same material of steel, and the fan is made from aluminum.