Track assembly and vehicle

1. A kit of track assemblies for a vehicle, the vehicle having a front left drive axle, a front right drive axle, a rear left drive axle and rear right drive axle, the kit comprising:

left and right front track assemblies mountable to the front left drive axle and the front right drive axle respectively, each of the left and right front track assembly including:

a frame having a front, a rear, a bottom, a left side, and a right side, a longitudinally-extending left slide rail positioned at the bottom of the frame on the left side of the frame, and a longitudinally-extending right slide rail positioned at the bottom of the frame on the right side of the frame;

a drive wheel rotationally mounted to the frame for rotation about a drive wheel axis, the drive wheel having a peripheral surface, the drive wheel being structured to be operatively connectable to the corresponding one of the front left drive axle and the front right drive axle of the vehicle to be driven by the one of the front left drive axle and the front right drive axle and to support a part of the vehicle's weight on terrain;

a front idler wheel assembly mounted at the front of the frame for rotation about a front idler wheel assembly axis parallel to the drive wheel axis, the front idler wheel assembly having a peripheral surface;

a rear idler wheel assembly mounted at the rear of the frame for rotation about a rear idler wheel assembly axis parallel to the drive wheel axis, the rear idler wheel assembly having a peripheral surface; and

an endless track having an inner surface facing the drive wheel, and an outer surface opposite the inner surface, the outer surface having a plurality of traction lugs distributed along the outer surface;

the left and right slide rails, the drive wheel, the front idler wheel assembly and the rear idler wheel assembly being positioned relative to the frame to support endless track around the left and right slide rails, the drive wheel peripheral surface, the front idler wheel assembly peripheral surface, and the rear idler wheel assembly peripheral surface,

a bottom surface of each of the left and right slide rails supporting the endless track against flat horizontal terrain when the track assembly is mounted on the one of the front left drive axle and the front right drive axle of the vehicle and the vehicle is stationary on the flat horizontal terrain,

the endless track being in driving engagement with the drive wheel,

at least one of the front idler wheel assembly and the rear idler wheel assembly being selectively movable between a plurality of longitudinally-distributed tension positions to tension endless track,

the left slide rail having,

a first central portion, the first central portion having a central portion length,

a first forward-facing portion extending forward from a front end of the first central portion by a forward horizontal projection and being angled upward from the first central portion, and

a first rearward-facing portion extending rearward from a rear end of the first central portion by a rearward horizontal projection and being angled upward from the first central portion,

the right slide rail having,

a second central portion, the second central portion having the central portion length,

a second forward-facing portion extending forward from a front end of the second central portion by the forward horizontal projection and being angled upward from the second central portion, and

a second rearward-facing portion extending rearward from a rear end of the second central portion by the rearward horizontal projection, and being angled upward from the second central portion,

the forward horizontal projection being greater than the central portion length; and

left and right rear track assemblies mountable to the rear left drive axle and the rear right drive axle respectively, the rear track assembly including:

a frame;

a drive wheel rotationally mounted to the frame and being structured to be operatively connectable to the corresponding one of the rear left drive axle and the rear right drive axle of the vehicle to be driven by the one of the rear left drive axle and the rear right drive axle and to support a part of the vehicle's weight on terrain;

a front idler wheel assembly mounted at the front of the frame;

a rear idler wheel assembly mounted at the rear of the frame; and

an endless track having an inner surface facing the drive wheel, the front idler wheel assembly and the rear idler wheel assembly, and an outer surface opposite the inner surface, the outer surface having a plurality of traction lugs distributed along the outer surface,

wherein each of the rear track assemblies further includes a dynamic traction device having one end connected to the frame and another end connected to the vehicle when the rear track assembly is in use.

2. The kit of claim 1 , wherein the frame of each of the rear track assembly has a front, a rear, a bottom, a left side, and a right side, and the frame further comprises:

a longitudinally-extending left slide rail positioned at the bottom of the frame, the left slide rail having a bottom surface having an upward curvature, a front end, a rear end and a length, and

a longitudinally-extending right slide rail positioned at the bottom of the frame, the right slide rail having a bottom surface having an upward curvature, a front end, a rear end, and a length; and

the endless track being in driving engagement with the drive wheel and being supported by the left and right slide rails for sliding on the bottom surfaces of the left and right slide rails.

3. The kit of claim 1 , wherein, in at least one of the track assemblies, the drive wheel, wheels of the front idler wheel assembly and wheels of the rear idler wheel assembly are the sole wheels of the track assembly contacting the endless track.

4. A vehicle having a front left drive axle, a front right drive axle, a rear left drive axle and rear right drive axle, the vehicle comprising:

a front track assembly mounted to one of the front left drive axle and the front right drive axle, the front track assembly including:

a frame having a front, a rear, a bottom, a left side, and a right side, a longitudinally-extending left slide rail positioned at the bottom of the frame on the left side of the frame, and a longitudinally-extending right slide rail positioned at the bottom of the frame on the right side of the frame;

a drive wheel rotationally mounted to the frame for rotation about a drive wheel axis, the drive wheel having a peripheral surface, the drive wheel being structured to be operatively connected to the one of the front left drive axle and the front right drive axle of the vehicle to be driven by the one of the front left drive axle and the front right drive axle and to support a part of the vehicle's weight on terrain;

a front idler wheel assembly mounted at the front of the frame for rotation about a front idler wheel assembly axis parallel to the drive wheel axis, the front idler wheel assembly having a peripheral surface;

a rear idler wheel assembly mounted at the rear of the frame for rotation about a rear idler wheel assembly axis parallel to the drive wheel axis, the rear idler wheel assembly having a peripheral surface; and

an endless track having an inner surface facing the drive wheel, and an outer surface opposite the inner surface, the outer surface having a plurality of traction lugs distributed along the outer surface;

the left and right slide rails, the drive wheel, the front idler wheel assembly and the rear idler wheel assembly being positioned relative to the frame to support the endless track around the left and right slide rails, the drive wheel peripheral surface, the front idler wheel assembly peripheral surface, and the rear idler wheel assembly peripheral surface,

a bottom surface of each of the left and right slide rails supporting the endless track against flat horizontal terrain when the track assembly is mounted on the one of the front left drive axle and the front right drive axle of the vehicle and the vehicle is stationary on the flat horizontal terrain,

the endless track being in driving engagement with the drive wheel,

at least one of the front idler wheel assembly and the rear idler wheel assembly being selectively movable between a plurality of longitudinally-distributed tension positions to tension endless track,

the left slide rail having,

a first central portion, the first central portion having a central portion length,

a first forward-facing portion extending forward from a front end of the first central portion by a forward horizontal projection and being angled upward from the first central portion, and

a first rearward-facing portion extending rearward from a rear end of the first central portion by a rearward horizontal projection and being angled upward from the first central portion,

the right slide rail having,

a second central portion, the second central portion having the central portion length,

a second forward-facing portion extending forward from a front end of the second central portion by the forward horizontal projection and being angled upward from the second central portion, and

a second rearward-facing portion extending rearward from a rear end of the second central portion by the rearward horizontal projection, and being angled upward from the second central portion,

the forward horizontal projection being greater than the central portion length; and

a rear track assembly mounted to one of the rear left drive axle and the rear right drive axle, the rear track assembly including:

a frame;

a drive wheel rotationally mounted to the frame and being structured to be operatively connected to the one of the rear left drive axle and the rear right drive axle of the vehicle to be driven by the one of the rear left drive axle and the rear right drive axle and to support a part of the vehicle's weight on terrain;

a front idler wheel assembly mounted at the front of the frame;

a rear idler wheel assembly mounted at the rear of the frame; and

an endless track having an inner surface facing the drive wheel, the front idler wheel assembly and the rear idler wheel assembly, and an outer surface opposite the inner surface, the outer surface having a plurality of traction lugs distributed along the outer surface;

wherein the rear track assembly further includes a dynamic traction device having one end connected to the frame and another end connected to the vehicle when the rear track assembly is in use.

5. The vehicle of claim 4 , wherein the frame of the rear track assembly has a front, a rear, a bottom, a left side, and a right side, and the frame further comprises:

a longitudinally-extending left slide rail positioned at the bottom of the frame, the left slide rail having a bottom surface having an upward curvature, a front end, a rear end and a length, and

a longitudinally-extending right slide rail positioned at the bottom of the frame, the right slide rail having a bottom surface having an upward curvature, a front end, a rear end, and a length; and

the endless track being in driving engagement with the drive wheel and being supported by the left and right slide rails for sliding on the bottom surfaces of the left and right slide rails.

6. The vehicle of claim 4 , wherein, in at least one of the front and rear track assemblies, the drive wheel, wheels of the front idler wheel assembly and wheels of the rear idler wheel assembly are the sole wheels of the track assembly contacting the endless track.

7. The vehicle of claim 4 , wherein the vehicle is one of an all-terrain vehicle, a utility-terrain vehicle, a side-by-side vehicle, and a wheelchair.