Patent ID: 7484579

Claim:
A crawler tractor comprising a machine body having a left side and a right side; an engine; a left traveling crawler on the left side of the machine body; a right traveling crawler on the right side of the machine body; a traveling speed-change mechanism interposed in a traveling transmission path extending from the engine to the pair of traveling crawler; a steering hydrostatic transmission for steering the machine body; a planetary gear differential mechanism that differentially drives the pair of traveling crawlers, wherein the planetary gear differential mechanism receives a traveling speed-change output from the traveling speed-change mechanism and a steering output from the steering hydrostatic transmission; a traveling brake capable of applying a brake force on the traveling transmission path; a front transmission case arranged at a front side of the machine body and accommodating the differential mechanism; a rear transmission case accommodating the traveling speed-change mechanism, wherein the planetary gear differential mechanism is operatively connected to a final output shaft of the traveling speed-change mechanism through a traveling transmission shaft; a reverser for switching between a first direction of movement and a second direction of movement of the machine body, the reverser having an output side, wherein the steering hydrostatic transmission has an input side connected downstream from the reverser mechanism along the traveling power transmission path, downstream in the driving system refers to an output side, and the traveling brake is arranged at the rear transmission case so as to apply the brake force on the final output shaft.