Possessing the mission case which provides the mission which becoming independent

摘要

PROBLEM TO BE SOLVED: To reduce the weight of a transmission by summerizing the functions so as to make the transmission as small as possible, in a crawler type moving agricultural machinery which is capable of only a pivot turn or three modes of pivot turn, a spin turn, and a mild turn. ;SOLUTION: A straight traveling gear 47 to transmit the output of an engine by converting to a high speed or a low speed; a pair of the left and the right side gears 48 and 49 connected to the left and the right crawlers constantly; a pair of side clutches to connect the motive power transmission between the straight running gear 47 and the left and the right side gears 48 and 49 allowable to connect and disconnect respectively; a pair of the left and the right change-over gears 42 and 43 connected to the left and the right side gears 48 and 49 constantly; the left and the right change-over clutches 40 and 41 to connect the motive power transmission between the change-over gears 42 and 43, and a control shaft 38 allowable to connect and disconnect; and a single brake 39 to brake the control shaft 38; are provided. And three functions of the left side brake, the right side brake, and a parking brake are given by braking both sides of one side of the left and the right crawlers.;COPYRIGHT: (C)1997,JPO