A driving device for a carriage includes a motor, a speed reducer, and a first mecanum wheel and a second mecanum wheel. The speed reducer decelerates the rotation input from the motor and outputs decelerated rotation. The first and second mecanum wheels are arranged in the axial direction parallel to the rotation axis of the decelerated rotation output from the speed reducer and are rotated by the decelerated rotation output from the speed reducer. In the axial direction, the center of the speed reducer is positioned between an outer end of the first mecanum wheel opposite to the second mecanum wheel and an outer end of the second mecanum wheel opposite to the first mecanum wheel.

An axle assembly having a brake drum and inboard and outboard wheels. The brake drum the inboard wheel may cooperate to inhibit movement of the inboard wheel in an inboard direction. An outboard wheel clamp and an outboard split ring may cooperate to inhibit movement of the outboard wheel in an outboard direction.

An axle assembly having a brake drum and inboard and outboard wheels. The brake drum the inboard wheel may cooperate to inhibit movement of the inboard wheel in an inboard direction. An outboard wheel clamp and an outboard split ring may cooperate to inhibit movement of the outboard wheel in an outboard direction.

A dual wheel mounting device having an inner wheel mount, a plurality of spaced fins connected to and extending outwardly from the inner wheel mount, and a plurality of U-shaped ribs aligned with and connected to the spaced fins. An outer ring is received within and connected to slots in the U-shaped ribs.

A dual wheel mounting device having an inner wheel mount, a plurality of spaced fins connected to and extending outwardly from the inner wheel mount, and a plurality of U-shaped ribs aligned with and connected to the spaced fins. An outer ring is received within and connected to slots in the U-shaped ribs.

An axle assembly includes an axle, an axle mount configured to be attached to the axle, a positional locater that projects from an outer surface of the axle and is configured to locate an initial position of the axle relative to the axle mount, and an axle adjustment device comprising an inclined surface that contacts the positional locater. A compressive force is exerted between the axle mount and the axle adjustment device when the axle adjustment device is placed in contact with the positional locater to maintain the initial position of the axle.

A mounting arrangement for adding an auxiliary wheel spaced from an existing wheel of a motor vehicle including two or more generally cylindrical spacers connected together abutting end to end, an inner spacer attached to a brake assembly member with a preexisting wheel rim compressed between an inside face of the inner spacer and the brake assembly member, and an outer spacer connected to the inner spacer by bolts, and holding stud bolts extending out and received through holes in the auxiliary wheel rim, with lug nuts fixing the rim of the auxiliary wheel against the outside end of the outer spacer. An intermediate spacer between the inner and outer spacers may alternatively be provided detachably connecting the inner and outer spacers together, attached to an outside end of the inner spacer and to the inside end of the outer spacer by bolts.

A mounting arrangement for adding an auxiliary wheel spaced from an existing wheel of a motor vehicle including two or more generally cylindrical spacers connected together abutting end to end, an inner spacer attached to a brake assembly member with a preexisting wheel rim compressed between an inside face of the inner spacer and the brake assembly member, and an outer spacer connected to the inner spacer by bolts, and holding stud bolts extending out and received through holes in the auxiliary wheel rim, with lug nuts fixing the rim of the auxiliary wheel against the outside end of the outer spacer. An intermediate spacer between the inner and outer spacers may alternatively be provided detachably connecting the inner and outer spacers together, attached to an outside end of the inner spacer and to the inside end of the outer spacer by bolts.

An axle assembly and a method of assembly. An outboard wheel is mounted to an outboard mounting arrangement of a wheel hub. An inboard wheel and a brake drum are mounted to an inboard mounting arrangement of the wheel hub such that a brake drum mounting arrangement of the brake drum is axially positioned between the inboard wheel and the inboard mounting arrangement.

An axle assembly and a method of assembly. An outboard wheel is mounted to an outboard mounting arrangement of a wheel hub. An inboard wheel and a brake drum are mounted to an inboard mounting arrangement of the wheel hub such that a brake drum mounting arrangement of the brake drum is axially positioned between the inboard wheel and the inboard mounting arrangement.