Komatsu Corporation

Kamatsu Ltd.

Kazuyuki Onohara

Tsuyoshi Yoshida

Taira Ozaki

A travel gear of a crawler work vehicle has a plurality of double bogie type track wheel devices. The double bogie type track wheel devices respectively include a first arm member attached to the lower part of a track frame so as to be swingable in the vertical direction, a second arm member whose almost center portion in the longitudinal direction is rotatably attached to the tip of the first arm member, and a pair of front and rear track wheels rotatably attached to front and rear ends of the second arm member and rolling on the tread of a crawler. A pair of first guard devices for preventing intrusion of a foreign matter into a space between the pair of front and rear track wheels and the crawler are attached to both side faces in the width direction of the vehicle of the first arm member.

Travel gear of crawler work vehicle

A crawler-type vehicle undercarriage including a track frame, an idler, a sprocket, a crawler encompassing the idler, track rollers, and the sprocket and the idler, the sprocket and the track frame located to line up in a straight line comprising the crawler-type vehicle undercarriage comprising (i) an idler avoided from pivoting upwardly or downwardly relative to the track frame, (ii) a first arm pivotally mounted at the bottom of the track frame, and (iii) a second arm pivotally connected to end portion of the first arm. The track roller unit adjacent the sprocket is preferably pivoted about a pivot center of the first arm positioned at the bottom of the track frame and toward the idler relative to a pivot center of the second arm. The track roller travel improves a flexibility of the track roller to the crawler, and work in a high tractive force is carried out with the track rollers providing unchangeable real contact areas to the ground.

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Yawata, Japan

Kazuyuki Onohara