| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic damper capable of effectively suppressing the vibration of a vehicle main body even if the mass of a working device varies and reducing the cost thereof. SOLUTION: In a dynamic damper of working vehicle, a working device 2 is installed on a vehicle main body 1, the working device 2 comprises a working part 13 and a lift cylinder 12 provided between the working part 13 and the vehicle main body 1 and moving the working part 13 up and down, and an accumulator 62 is connected to the load holding side oil chamber 28 of the lift cylinder 12. The dynamic damper comprises A. a variable choke device 61 installed between the load holding side oil chamber 28 of the lift cylinder 12 and the accumulator 62, B. a detection means 49 detecting a hydraulic pressure in the load holding side oil chamber 28 of the lift cylinder 12, and C. a control means 53 increasing the choke opening of the variable choke device 61 when a hydraulic pressure detected by a detection means 49 is smaller than a set pressure and decreasing the choke opening of the variable choke device 61 when the hydraulic pressure is equal to or larger than the set pressure.
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