| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrier capable of maintaining horizontality of a load carrying platform with favourable responsiveness an without being influenced by travelling speed. SOLUTION: It is furnished with a positional control device 80 to make a rear part travelling machine travel at a constant speed by outputting a constant speed command to an inverter 71 of a rear part travelling motor 45 of the rear part travelling machine and to make a front part travelling machine variably travel by feeding an inclination of a load carrying platform 15 detected by a clinometer 18 back to a vector inverter 83 of a front part travelling motor 35 of the front part travelling machine and outputting a travelling speed command of the front part travelling motor 35 to make the inclination of the load carrying platform 15 estimated from a pulse signal of an encoder 81 of the front part travelling motor 35 and output of the inverter 71 of the rear part travelling motor 45 zero. In aforementioned constitution, change of the travelling speed of the rear part travelling machine can be reflected to the motor frequency of the front part travelling motor 35 in advance of inclination of the load carrying platform 15, and consequently, it is possible to restrain inclination of the load carrying platform 15 due to speed change of the rear part travelling motor 45 to the minimum.
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