Abstract: A vehicle that includes front and rear wheels, an engine, an engine-driven rear angle drive for supplying torque to the rear wheels, and a power train for supplying torque from the engine to the front wheels. The power train includes driving and driven members and a coupler having an actuator switchable between on and off positions, the actuator, when off, permitting the driven member to turn freely and independently of the driving member and, when on, enabling the coupler to respond to predetermined minimum differences in rotational speed between the driving and driven members to lock these members together to rotationally couple the engine to at least one of the front wheels.

Abstract: This invention relates to multiple driven axle vehicles, and particularly to all-terrain vehicles equipped for rear wheel drive, four wheel drive, and on-demand front wheel drive. The invention is directed toward a system of switchable traction options allowing the vehicle operator to easily choose between different modes, such as rear wheel drive with an open or unlocked differential, rear wheel drive with a locked differential, four wheel drive with open differentials, four wheel drive with one locked differential, four wheel drive with two locked differentials, or rear wheel drive with on-demand four wheel drive.

Abstract: A rider interface for electronic or mechanical shifting of an ATV provided on the ATV handlebars. An up-shift mechanism is located on one side of the ATV and a down-shift mechanism is located remotely from the up-shift mechanism on an opposite side of the ATV. Preferably, the up-shift mechanism is in the form of a paddle lever and the down-shift mechanism is in the form of a trigger lever.

Abstract: This invention relates to multiple driven axle vehicles, and particularly to all-terrain vehicles equipped for rear wheel drive, four wheel drive, and on-demand front wheel drive. The invention is directed toward a system of switchable traction options allowing the vehicle operator to easily choose between different modes, such as rear wheel drive with an open or unlocked differential, rear wheel drive with a locked differential, four wheel drive with open differentials, four wheel drive with one locked differential, four wheel drive with two locked differentials, or rear wheel drive with on-demand four wheel drive.

Abstract: This invention relates to multiple driven axle vehicles, and particularly to all-terrain vehicles equipped for rear wheel drive, four wheel drive, and on-demand front wheel drive. The invention is directed toward a system of switchable traction options allowing the vehicle operator to easily choose between different modes, such as rear wheel drive with an open or unlocked differential, rear wheel drive with a locked differential, four wheel drive with open differentials, four wheel drive with one locked differential, four wheel drive with two locked differentials, or rear wheel drive with on-demand four wheel drive.