HST type variable speed feature for minute steering feature

摘要

PROBLEM TO BE SOLVED: To perform the microsteeing regardless of a position of a steering handle, by comprising a link for transmitting the rotation of the steering handle to a transmission mechanism of a HST stepless transmission mechanism for turning, and a double acting piston installed in an operating system, and expanding and contracting the double acting piston by the operation of a sensor mechanism for microsteering. ;SOLUTION: A transmission lever 68 connected to a HST-type stepless transmission mechanism for steering, and a steering handle 19 connected to a HST-type stepless transmission mechanism for turning. are interlocked and connected to an interlocking device 69, and the interlocking mechanism 69 is interlocked and connected to a travel transmission operating arm of each transmission mechanism and a turning operation arm. A handle operation shaft 113 of the steering handle 19 comprises a gear 114, to be engaged with a sector gear 116 mounted on a rotation axis 115, and an oscillating arm 118 of a steering shaft 117 and an output arm 119 fixed to the rotation axis 115 are connected through a rod 120. The double acting piston ST is installed on the rod 120, and the microsteering is performed by the expanding and contracting of the piston ST on the basis of the output singals of the left and right sensor mechanisms for microsteering.;COPYRIGHT: (C)1998,JPO