A track assembly is formed from an endless track, an elongate guide member, a drive sprocket, and a plurality of track engaging rollers. The endless track has an inner surface having a plurality of parallel circumferential ridges. Formed between the circumferential ridges is a circumferential channel. The guide member is at least partially positioned and closely received within the circumferential channel. The track engaging rollers are arranged in a pair of parallel rows near an outer side of each circumferential ridge. During track rotation, the guide member remains closely received within the channel, and the rollers contact the outer side of the ridges to resist lateral movement of the track. Positioning of the guide member in the circumferential channel, with the rollers outside the ridges, laterally stabilizes the track thereby reducing the risk of the track slipping off the track assembly.

A transition track slider has a hollow body including a first side surface, a second side surface, a bottom surface at least partially interposed between the first side surface and the second side surface, and that also defines a cavity. A front surface with a bullet nose configuration connects the first side surface to the second side surface, and to the bottom surface, while a rear surface connects the first side surface to the second side surface, and to the bottom surface. A top surface extends from the rear surface toward the front surface.

Kit of front and rear track assemblies mountable on a drive axle of a vehicle. The front track assembly has a frame, a leading idler wheel mounted to the frame for rotation about a leading idler wheel axis, a trailing idler wheel mounted to the frame for rotation about a trailing idler wheel axis, a drive wheel assembly, and at least two slide rails. The slide rails have corresponding forward-facing portions, central portions, and rearward-facing portions. The rear track assembly has slide rails having a bottom surface with an upward curvature. A vehicle having the front and rear track assemblies.

A track assembly to be mounted on a vehicle. The track assembly has a frame, a drive wheel rotationally mounted to the frame, a front idler wheel assembly mounted to the frame, a rear idler wheel assembly mounted to the frame, and a track mounted around the front idler wheel assembly, the rear idler wheel assembly, and the drive wheel, and being in driving engagement with the drive wheel. The track has a plurality of traction lugs distributed along an outer surface of the track. Each traction lug of the plurality of traction lugs has a height in a range of 1.6 inches to 2.5 inches. A distance between a foremost point on the outer surface of the track and a rearmost point on the outer surface of the track is between 54 inches and 65 inches.

A track assembly is to be mounted on a drive axle of a vehicle. The track assembly has a frame, at least one leading idler wheel mounted to the front of the frame for rotation about a transverse leading idler wheel axis, at least one trailing idler wheel mounted to the rear of the frame for rotation about a traverse trailing idler wheel axis parallel to the leading idler wheel axis, a single drive wheel assembly, and at least two slide rails. The slide rails have corresponding forward-facing portions, central portions, and rearward-facing portions. The forward-facing portions project from the front ends of the central portions by a projection that is greater than a length of the central portions. A vehicle having the track assembly is also described.

A track assembly to be mounted on a vehicle. The track assembly has a frame, a drive wheel, and front and rear idler wheel assemblies rotationally mounted to the frame. A track is mounted around the front and rear idler wheel assemblies, and the drive wheel. The track has traction lugs distributed along an outer surface thereof. The frame has an effective frame length equal to a horizontal distance between a foremost point on the outer surface of the track and the rear idler wheel assembly axis. The effective frame length is between 48 and 60 inches. The frame has an effective frame height equal to a vertical distance between the drive wheel axis and a point on the outer surface of the track, the point being positioned directly below the drive wheel axis. The effective frame height is between 17 and 20 inches.

A snowmobile comprises a chassis with a front portion and a tunnel, and a power train unit supported by the chassis. The snowmobile further includes a plurality of ground-engaging members cooperating with the power train unit to operate the snowmobile. The plurality of ground-engaging members includes a pair of front skis and an endless track assembly. The snowmobile also includes a front suspension operably coupled to the pair of front skis. The snowmobile also includes a rear suspension operably coupled to the track. The rear suspension includes slide rails and track sliders for engaging the track. The track sliders are comprised of a first and second retention members for coupling with the slide rail. The retention members are comprised of a plurality of recesses where material is removed for light weighting.

A track support rail for slidably supporting a track assembly of a machine includes a body having a first body end, a second body end, a crown portion, and an upper support surface. The body extends along a longitudinal axis between the first and second body ends. The crown portion is disposed between the first and second body ends along the longitudinal axis. The upper support surface extends along the longitudinal axis between the first and second body ends. The upper support surface includes first and second curved segments. The first curved segment has a first curved shape and extends from the first body end toward the crown portion of the body. The second curved segment has a second curved shape and extends from the second body end toward the crown portion of the body. The first curved shape is different from the second curved shape.

A lock plate configured to retain a wear runner against a support may include a first retainer arm, a second retainer arm, and a web coupling the first and second retainer arms to one another. The first retainer arm, the second retainer arm, and the web may define a recess configured to receive a retainer pin associated with the wear runner. The first retainer arm and the second retainer arm may have a thickness configured to fit within a groove extending at least partially around the retainer pin, such that the lock plate holds the wear runner against the support on a side of the support opposite the lock plate.

A tracked undercarriage for a tracked vehicle has an elongated structure; a first wheel rotatably mounted to the elongated structure at a first end of the elongated structure; a second wheel rotatably mounted to the elongated structure at a second end of the elongated structure; a track, which is looped around the first and second wheels and has an inner face configured to be arranged in contact with the first and second wheels and at least one protrusion of the cross-section extending from the inner face of the track and engaging respective spaces in the first and second wheels; and a track guide extending between the first and second wheels and configured to guide said protrusion as the track travels.