Abstract: First rear swing arms are pivotably supported at their front ends to a drive shaft on which drive wheels are mounted. The rear ends of the first rear swing arms are pivotably supported through a shaft to the front ends of side rails, and first idlers are mounted on the shaft. Second idlers are mounted on a shaft to which the rear ends of the side rails are supported, and second rear swing arms are supported at their lower ends to shafts supported to the rear ends of the side rails. The upper ends of the second rear swing arms are supported to a shaft supported to a floor. A track belt is wrapped around the drive wheels and the idlers. Sliders and are individually mounted on the first rear swing arms and the side rails, respectively.

Abstract: Variation in steering force is reduced by providing side edges attached to the right and the left side surfaces of a steering ski. The side edges have a continuously curved lower surface. A vertical plane including the axis of a pivot shaft crosses a middle portion of each side edge. Dislocation of contact centers from a pivot point, and the distances between the pivot point and the contact centers are small when the steering ski swings on the pivot shaft.

Abstract: A snowmobile having a crawler belt operatively connected to a drive wheel, slide rails and guide wheels supported by the slide rails, the slide rails including a main slide rail arranged at approximately a midportion of the crawler belt, and a pair of right and left side slide rails arranged along outside side edges of the crawler belt, the guide wheels being arranged between the main slide rail and the side slide rails.

Abstract: A slide rail structure for a snow vehicle includes a main slide rail disposed at the middle of a crawler belt with respect to the width of the crawler belt. A pair of side slide rails are disposed near the opposite side ends, respectively, of the crawler belt. The guide wheels are disposed between the main slide rail and the side slide rails. An appropriate contact load is maintained between the snow vehicle and the snow to thereby enhance the turning ability of the snow vehicle. One or more edges can be provided on a lower surface of the body cover of the snow vehicle. These edges can dig into the snow to compensate for a reduction in the contact force of the affront ski of the snow vehicle with the snow during turning. The front ski of the snow vehicle can be mounted using an elastic, biasing member. This member helps improve timing and responsiveness for turning of the snow vehicle.

Abstract: A pair of upright portions are provided on the opposite side portions of a floor on which a driver of a small snowmobile stands. A pad extends inwardly from an upper portion of each of the upright portions to securely hold the feet of the driver while maintaining adequate floor surface area for the feet. Further, a radiator for cooling an engine is disposed along a lower face of the floor so that it melts snow lying on the floor.