US 2016/0244111 A1Published application

Work vehicle

AssigneeKomatsu Ltd.

InventorsWilliam Schierschmidt, Masaru Kurita

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Abstract

A work vehicle comprises a vehicle body, a work implement, a track frame, a sprocket, an idler, a plurality of small track rollers, and first and second large track rollers. The track frame comprises opposite first and second end sections, and opposite upper and lower sections. The sprocket and idler are rotatably mounted to the first and second end sections, respectively, to movably support an endless track. The small and large track rollers are rotatably mounted to the lower section between the sprocket and idler and are unmovable in vertical and horizontal directions of the track frame. The small track rollers are all disposed between the first and second large track rollers. Each small track roller defines a respective small track rolling surface having a respective first tread diameter and each large track roller defines a respective large track rolling surface having a respective second tread diameter greater than each respective first tread diameter.

Claims20

Dependent claims

A work vehicle comprising:

a vehicle body;
a work implement;
a track frame comprising a first end section, a second end section opposite the first end section, an upper section and a lower section opposite the upper section;
a sprocket rotatably mounted to the first end section of the track frame;
an idler rotatably mounted to the second end section of the track frame, the sprocket and the idler being configured to movably support an endless track that passes about the sprocket and the idler;
a plurality of small track rollers configured to guide the endless track, each including a respective small track roller shell rotatably mounted to the lower section of the track frame between the sprocket and the idler by a respective small track roller support shaft that is fixedly mounted to the track frame, such that the small track rollers are unmovable in vertical and horizontal directions with respect to the track frame;
and
first and second large track rollers configured to guide the endless track, each including a respective large track roller shell rotatably mounted to the lower section of the track frame between the sprocket and the idler by a respective large track roller support shaft that is fixedly mounted to the track frame, such that the first and second large track rollers are unmovable in the vertical and horizontal directions with respect to the track frame with all of the small track rollers being disposed between the first and second large track rollers, each of the small track rollers defining a respective small track rolling surface having a respective first tread diameter and each of the large track rollers defining a respective large track rolling surface having a respective second tread diameter that is greater than the respective first tread diameter of each of the small track rollers.

5 more elements

A work vehicle comprising:

a vehicle body;
a work implement;
a track frame comprising a first end section, a second end section opposite the first end section, an upper section and a lower section opposite the upper section;
a sprocket rotatably mounted to the first end section of the track frame;
an idler rotatably mounted to the second end section of the track frame, the sprocket and the idler being configured to movably support an endless track that passes about the sprocket and the idler;
and
a plurality of track rollers, each including a respective track roller shell rotatably mounted to the lower section of the track frame between the sprocket and the idler by a respective track roller support shaft that is fixedly mounted to the track frame, such that the track rollers are unmovable in vertical and horizontal directions with respect to the track frame, a first track roller of the plurality of track rollers is mounted closest to the sprocket and a second track roller of the plurality of track rollers is mounted closest to the idler;
each of the track rollers except the first and second track rollers including a pair of small thrust bushings mounted over the respective track roller support shaft between the respective track roller support shaft and the respective track roller shell, each of the small thrust bushings including a small annular flange having a small annular flange surface that contacts a respective end of the respective track roller shell, the small annular flange surface having a first surface area;
and
each of the first and second track rollers includes a pair of large thrust bushings mounted over the respective track roller support shaft between the respective track roller support shaft and the respective track roller shell, each of the large thrust bushings including a large annular flange having a large annular flange surface that contacts a respective end of the respective track roller shell, the large annular flange surface having a second surface area greater than the first surface area.

7 more elements

Dependencies are inferred from the claim text.