A wheel may include a centerless rim with a rail with a driving feature, where the rail protrudes towards a middle of the centerless rim in a first plane. The wheel may also include a stationary hub positioned along a second plane generally parallel with the first plane. The wheel may additionally include a roller guide assembly that includes a support member coupled to the stationary hub and configured to bridge the rail, and first and second roller guides coupled to the support member and positioned to roll along the centerless rim adjacent to and on either side of the rail. The wheel may additionally include a spring positioned to bias the first roller guide against the centerless rim.

The present disclosure includes a transmission comprising a first wheel assembly including a first wheel, a first drive gear coupled to the first wheel such that driving the first drive gear causes a corresponding rotation of the first wheel, and a first motor coupled to the first drive gear to drive the first drive gear. The transmission also includes a second wheel assembly that includes, a second wheel, a second drive gear coupled to the second wheel such that driving the second drive gear causes a corresponding rotation of the second wheel, and a second motor coupled to the second drive gear to drive the second drive gear.

An axle-free wheel comprising: an outer rim member having a ground interface on an external surface thereof and an outer ball race or rolling race on an inner surface thereof; an inner rim member having an inner ball or rolling race on an outer surface thereof.

The invention relates to an axle and bearing for a conveyor chain link, such as those used in commercial bakery equipment. The conveyor chain link generally includes at least one roller bearing wheel with a central hole, an axle pin, and a link component with a bore. The axle pin is configured to extend through the hole in the roller bearing wheel and the bore in the link component to attach the at least one roller bearing wheel to the link component. The axle pin includes a medial portion having at least one surface engagement feature configured for anti-spin engagement with the link component. The roller bearing wheel includes at least one engagement feature for anti-spin engagement with the distal end of the axle pin.

The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

An axle-free wheel comprising: an outer rim member having a ground interface on an external surface thereof and an outer ball race or rolling race on an inner surface thereof; an inner rim member having an inner ball or rolling race on an outer surface thereof.

The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

The present disclosure may relate to centerless wheel assembly that includes a centerless rim including a first center point laying in a first plane generally defined by the centerless rim. The centerless wheel assembly may also include a centerless ring gear coupled to the centerless rim such that rotation of the centerless ring gear causes a corresponding rotation of the centerless rim. The centerless ring gear may include a second center point laying in a second plane generally defined by the centerless ring gear, and the first plane may be generally parallel to the second plane. Additionally, the centerless ring gear may be shaped to interface with a drive gear that drives the centerless ring gear.

The invention discloses a wheel structure and a scooter comprising the wheel structure. The wheel structure comprises: an inner rim having a first inner annular face and a first outer annular face that are arranged radially, the first inner annular face is hollow and provided with an interface for connecting to a steering mechanism of the scooter; an outer rim having a second inner annular face which is arranged radially and a second outer annular face for contacting the ground; wherein an intermediate connecting assembly is disposed between the first outer annular face of the inner rim and the second inner annular face of the outer rim, and the outer rim, without need for hub, contacts the inner rim in a rolling manner via the intermediate connecting assembly and is rotatable relative to the inner rim. The wheel structure does not contain a hub and presents a hollow visual effect of the wheel.