A method for forming an axle shaft that includes friction welding a tubular shaft to a shaft portion of a wheel flange. Portions of the joint members on the tubular shaft and the wheel flange are extruded into an annular weld cavity in the wheel flange during the formation of the friction weld. A related axle shaft is also provided.

The present invention relates to a hub for a bicycle, having a hub axle, a hub sleeve which is mounted rotatably on the hub axle via a bearing arrangement, a driver which is mounted rotatably on the hub axle via a bearing arrangement and is coupleable to the at least one hub sleeve in a torque-transmitting manner, wherein the bearing arrangement has at least one axially inner bearing and at least one axially outer bearing. At least one fastening element is provided, which fixes at least the inner bearing of the bearing arrangement in its predetermined position on the hub axle by a local or sectional enlargement of the cross section of the hub axle.

A vehicle wheel end assembly comprising a wheel hub, rotatably mounted on a wheel axle spindle by a wheel bearing s comprising a roller bearing. The wheel bearing has a bearing inner ring mounted on an external section of the wheel axle spindle and a bearing outer ring mounted in an internal section of the wheel hub. The assembly further comprises a threaded hub nut mounted at the end of the wheel axle spindle to fix the bearing inner ring on the wheel axle spindle and a rotational lock mechanism to prevent relative rotation between the bearing inner ring and the wheel axle spindle. The rotational lock mechanism comprises a tangential surface arranged to intersect a part of an inner circumference of the bearing inner ring at right angles to the axis of rotation in a plane located at or adjacent an outer radial end surface of the bearing inner ring.

A hub for a bicycle has a body (10) which is hollow and tubular, an inner gear (14) which is formed on an inner surface at an end of the body (10). A gear set (20) is engaged with the inner gear (14), and a wheel base (30) is rotatably engaged with the gear set (20) unidirectionally. Two shock-absorbing gaskets (40) are attached respectively to two sides of the gear set (20).

An improved mecanum wheel that can be configured as a left-hand or a right-hand mecanum wheel is provided. The improved mecanum wheel is designed to enhance maneuverability and precision in various applications, such as robotics and vehicles. This improved mecanum wheel features a unique configuration with an inner rim 102, an outer rim 104, one or more rollers 106, one or more sandwich bolts 108, one or more invertible roller guides 110, one or more perpendicular bolts 112, one or more roller caps 114, and one or more guide pockets. The integration of these elements ensures (i) the flexibility in configuring the improved mecanum wheel as a left-hand or a right-hand mecanum wheel and (ii) precise and controlled movement of the mecanum wheel, thereby improving the overall performance of machines or robots equipped with it.

An adjustable positioning structure of a bearing of a bicycle wheel rim contains: a central shaft, two screw nut devices, two bearing caps, two fitting sleeves, two fixers, and two abutting elements. The central shaft includes two threaded portions. Each screw nut device includes two screw nuts for adjusting a length of the central shaft. Each bearing cap includes a through orifice. An internal ring of each fitting sleeve is fitted into each bearing cap. Each fixer is disposed on each fitting sleeve. Each screw nut device is configured to position an internal ring of each fitting sleeve to adjust a working length of the hub. Each abutting element is fixed on each fixer to connect the central shaft, each bearing cap and each fitting sleeve on the hub, thereafter the hub is locked on a bicycle rack or a front fork of a bicycle.