| 摘要 |
PURPOSE:To automatically change the direction of wheels of a working machine by providing an oil cylinder astride the axle of the towed working machine and a direction changing shaft and controlling it according to the action of limit switches in response to the refractive angle between a tractor and the towed working machine. CONSTITUTION:A working machine 31 towed by a tractor is provided with a hydraulic cylinder 34 astride an axle 32 and a direction changing shaft 33 provided in parallel with this axle 32. The direction changing shaft 33 is shifted to either the right or the left direction against the axle 32 by the expansion/ shrinkage motion of this hydraulic cylinder 34 to change the direction of wheels of the working machine 31. In addition, a hitch angle sensor 12 detecting the refractive angle between a hitch 46 provided at the front of the working machine 31 and a draw bar 47 pivotally fitted at its front end is provided, and the pressure oil feed to the hydraulic cylinder 34 is controlled as individual limit switches 13, 18 are turned on or off according to the displacement of the slide rod 48 of this sensor 12.
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