| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a rotation drive mechanism of a radiator fan which can suppress that the rigid body vibration or the like of an internal combustion engine 10 is transmitted to a vehicle body 2 and a cab via a radiator unit 13, and can improve in-cabin noise without impairing a tension adjusting function of a fan belt 19 when transmitting a part of a rotation drive force of a crank shaft 11 of the internal combustion engine 10 to the radiator fan 16 of the radiator unit 13, and a rotation drive method.SOLUTION: A part of a rotation drive force of a crank shaft 11 of an internal combustion engine 10 is transmitted to a fan shaft 14 by a fan belt 19 which is bridged between a crank pulley 12 and a fan pulley 16, the fan belt 19 is bridged, a position movement amountΔD2 of a variable tension pulley 21 which adjusts the tension of the fan belt 19 is varied according to a vibration displacement amountΔD1 of the crank shaft 11, and a transmission amount of a tension variation of the fan belt 19 to the fan shaft 14 is reduced.</p> |
