Patent ID: 9694862
Date: 2017-07-04
CPC Classifications: B62D

Claim:
1. 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, and each of the small track rolling surfaces and each of the large track rolling surfaces are substantially aligned along a track guide line that extends tangentially to each of the small track rolling surfaces and each of the large track rolling surfaces such that the small and large track rollers are configured to guide the endless track along the track guide line.