Operation mechanism of the HST-type mission equipment

摘要

PROBLEM TO BE SOLVED: To performed forward rotation and reversing and gear shift of right and left crawlers by a method wherein a hydraulic type continuously variable transmission mechanism for turn is provided so that turn steering operation of a crawler type working machine is practicable by a round type steering handle, and a differential mechanism is operated through forward rotation and revere of a hydraulic continuously variable stage transmission mechanism for turn. ;SOLUTION: This HST type continuously variable transmission mechanism 28 for turn is provided, a swash 146 is operated by a round steering handle, and rotation of the HST type continuously variable transmission mechanism for turn is changed. Through operation of a differential mechanism, turn steering is performed. In this case, a turn servo mechanism T2 to operate the swash comprises a piston P2; a spool S2; an automatic turn control valve V1; and a turn manual control valve. Pressure oil from a turn manual operation control valve is fed to one of the pistons, the piston is forcibly slid, and the swash is turnably operated in linkage with the piston.;COPYRIGHT: (C)1998,JPO