A hub mechanism includes a hub body and multiple piston assemblies. The hub body defines multiple piston chambers and multiple piston hole sets, each piston hole set includes multiple piston holes, and each piston chamber is communicated with the corresponding piston hole set's multiple piston holes. The outer peripheral wall of the hub body is used for connecting to the driving buffer assembly. Each piston assembly includes a piston plate and multiple piston unit columns, with multiple piston unit columns arranged in parallel and connected to the piston plate. The piston plate of each piston assembly is located within the corresponding piston chamber and is slidably connected to the hub body. The multiple piston unit columns correspond one-to-one with the multiple piston holes of the respective piston hole sets, with each piston unit column being slidably connected to the hub body.

A wheel with a suspension system being connectable to a vehicle, like a wheel chair, comprises a hub (38) and a rim (34) rotatable about the axle (42) of the hub (38). Between the hub (38) and the rim (34), a number of support members (40) is located. The support members (40) are adapted to retain the distance when stressed up to a threshold value and recoverly alter the distanced when stressed over this threshold value. According to the invention, the support members (40) are comprising spring elements (50), damping strokes by compression if the support member (40) is compressed or elongated. The spring elements (50) are preferably preloaded.

A wheel with a suspension system being connectable to a vehicle, like a wheel chair, comprises a hub (38) and a rim (34) rotatable about the axle (42) of the hub (38). Between the hub (38) and the rim (34), a number of support members (40) is located. The support members (40) are adapted to retain the distance when stressed up to a threshold value and recoverly alter the distanced when stressed over this threshold value. According to the invention, the support members (40) are comprising spring elements (50), damping strokes by compression if the support member (40) is compressed or elongated. The spring elements (50) are preferably preloaded.

A wheel assembly may include an inner rim and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs coupled between the inner and outer rims, and a tread assembly carried by the outer rim. The tread assembly may include an inner resilient material layer carried by an outer circumferential surface of the outer rim, and an outer metallic layer carried by the inner resilient material layer to rotatably contact a ground surface as the wheel assembly moves along a path of travel.

A wheel assembly may include an inner rim and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs coupled between the inner and outer rims, and a tread assembly carried by the outer rim. The tread assembly may include an inner resilient material layer carried by an outer circumferential surface of the outer rim, and an outer metallic layer carried by the inner resilient material layer to rotatably contact a ground surface as the wheel assembly moves along a path of travel.

A wheel assembly may include an inner rim, and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs coupled between the inner and outer rims. Each gas spring may include a cylinder body, a piston rod movable within the cylinder body, and a damper assembly coupled to an end of the cylinder body. The damper assembly may include a plug body coupled to an end of the cylinder body and having an opening to permit passage of the piston rod therethrough, and a damper end cap coupled to the plug body to define a wedge cavity surrounding the piston rod. The damper assembly may also include a wedge body surrounding the piston rod within the wedge cavity to frictionally dampen piston rod movement.

A wheel assembly may include an inner rim, and an outer rim surrounding the inner rim. The wheel assembly may also include gas springs coupled between the inner and outer rims. Each gas spring may include a cylinder body, a piston rod movable within the cylinder body, and a damper assembly coupled to an end of the cylinder body. The damper assembly may include a plug body coupled to an end of the cylinder body and having an opening to permit passage of the piston rod therethrough, and a damper end cap coupled to the plug body to define a wedge cavity surrounding the piston rod. The damper assembly may also include a wedge body surrounding the piston rod within the wedge cavity to frictionally dampen piston rod movement.

A mine material processing apparatus may include a rotatable drum to process mine material, and wheel assemblies configured for rotation of the rotatable drum. Each wheel assembly may include an inner rim, an outer rim surrounding the inner rim, and gas springs operatively coupled between the inner rim and the outer rim.

A mine material processing apparatus may include a rotatable drum to process mine material, and wheel assemblies configured for rotation of the rotatable drum. Each wheel assembly may include an inner rim, an outer rim surrounding the inner rim, and gas springs operatively coupled between the inner rim and the outer rim.

A wheel assembly to be coupled to a hub of a vehicle may include an inner rim to be coupled to the hub of the vehicle and an outer rim surrounding the hub. The wheel assembly may also include gas springs operatively coupled between the inner rim and the outer rim to provide a gas suspension for relative movement between the inner rim and the outer rim. An outer ring may be adjacent an inboard side of the outer rim and defining a closeable gap with adjacent interior portions of an inboard side of the inner rim to define a mechanical stop to limit relative movement between the inner rim and outer rim. The gas springs may be arranged on an outboard side of the outer ring.