A wheel assembly is disclosed, the wheel assembly including a rigid wheel and an airless tire mounted on the wheel. A portion of the tire is separated radially from the wheel by a space and is configured to flex inwardly toward the wheel when subject to ground engaging pressure. A spacer is interposed between the wheel and the portion of the tire separated radially from the wheel by a space and is configured to limit the inward flexing of the tire. The spacer may be permanently affixed to the wheel assembly or may be removably attached to the wheel assembly. The spacer may be adjustable between a first size and a second size.

A wheel assembly is disclosed, the wheel assembly including a rigid wheel and an airless tire mounted on the wheel. A portion of the tire is separated radially from the wheel by a space and is configured to flex inwardly toward the wheel when subject to ground engaging pressure. A spacer is interposed between the wheel and the portion of the tire separated radially from the wheel by a space and is configured to limit the inward flexing of the tire. The spacer may be permanently affixed to the wheel assembly or may be removably attached to the wheel assembly. The spacer may be adjustable between a first size and a second size.

An aluminum alloy wheel for a vehicle is provided, which includes: a wheel central portion, a rim portion, and a plurality of radial elements, wherein the aluminum alloy wheel is processed by centrifugal casting and forging to form a central portion with a morphology exhibiting a grain size variation with decreasing gradient in a lateral direction from an inner side of the wheel central portion to an outer side thereof.

An aluminum alloy wheel for a vehicle is provided, which includes: a wheel central portion, a rim portion, and a plurality of radial elements, wherein the aluminum alloy wheel is processed by centrifugal casting and forging to form a central portion with a morphology exhibiting a grain size variation with decreasing gradient in a lateral direction from an inner side of the wheel central portion to an outer side thereof.

A robot cleaner includes: a body having a suction port; a plurality of wheels for movement of the body; and a plurality of driving devices configured to drive the plurality of wheels, respectively, wherein each of the plurality of wheels includes an inner wheel and an outer wheel having a thickness that is larger than a thickness of the inner wheel, and each of the inner wheel and the outer wheel includes a plurality of slits.

A wheel assembly comprising a wheel disk and a tread member disposed around the wheel disk. The wheel disk can have a substantially conical shape when in an unloaded state, but be flexible such that it can deform under load to optimize and/or maximize contact area between the tread member and a driving surface.

A wheel assembly comprising a wheel disk and a tread member disposed around the wheel disk. The wheel disk can have a substantially conical shape when in an unloaded state, but be flexible such that it can deform under load to optimize and/or maximize contact area between the tread member and a driving surface.

A high temperature-resistant wheel, comprising: an elastic hub assembly (1), which has a thermal insulation layer integrated therewith so as to insulate the elastic hub assembly (1) from exterior high temperatures; and a rigid wheel barbed ring (2), which has the elastic hub assembly (1) fastened inside and rotates together with the elastic hub assembly (1). A robot, which comprises the high temperature-resistant wheel.

A high temperature-resistant wheel, comprising: an elastic hub assembly (1), which has a thermal insulation layer integrated therewith so as to insulate the elastic hub assembly (1) from exterior high temperatures; and a rigid wheel barbed ring (2), which has the elastic hub assembly (1) fastened inside and rotates together with the elastic hub assembly (1). A robot, which comprises the high temperature-resistant wheel.

A modular non-pneumatic tire includes a first annular tire module and a second annular tire module coaxial with the first annular tire module. The first annular tire module includes a first inner ring, a first outer ring coaxial with the first inner ring, first support structure extending between the first inner ring and the first outer ring, and a first circumferential tread extending about the first outer ring. The second annular tire module includes a second inner ring, a second outer ring coaxial with the second inner ring, second support structure extending between the second inner ring and the second outer ring, and a second circumferential tread extending about the second outer ring. The first and second circumferential treads are asymmetrical. The first circumferential tread has a first orientation and the second circumferential tread has a second orientation that is different from the first orientation.