Disclosed are an explosion-proof tire hub, including a hub body and an explosion-proof convex retainer. The hub body includes bent portions configured to mount a vacuum tire, the hub body is provided with a central axis, the explosion-proof convex retainer is fixed on the hub body, the distance between an upper end of the explosion-proof convex retainer and the central axis is L1, the distance between an upper end of the bent portion and the central axis is L2, and L1 is greater than L2. In case of burst or instantaneous pressure loss, because the distance L1 between the upper end of the explosion-proof convex retainer and the central axis is greater than the distance L2 between the upper end of the bent portion and the central axis, the explosion-proof convex retainer reduces the distance between the whole hub and the ground during tire burst and improves safety performance.

A preform for fabricating a wheel rim and a method of making a preform is provided. The preform includes a main section and at least one secondary section, each section being formed from composite materials, such as triaxially braided composite material that includes fibers oriented in at least three directions. The main section forms at least part of a lateral section of the preform and the secondary section forms at least part of a radial portion of the preform, the radial portion of the preform being generally perpendicular to the lateral section of the preform. The preform is fabricated from a plurality of composite layers, at least some being custom composite layers having a plurality of axial fibers interwoven intermittently with substantially consistent first and second sets of biased fibers. In some embodiments, the preform is initially fabricated in an intermediate configuration prior to being moved to a final configuration.

A wheel construction includes a wheel rim which in use, receives a tire, the rim being circular and having axially inner and outer portions each of which provides a flange which in use provides a seat for a bead of the tire, and the wheel construction including a mid-portion between the inner and outer portions, and side parts, connecting the mid and outer portions, the mid-portion including a circumferential well where the radius of the wheel rim is a minimum, at least one of the side parts including a plurality of curved regions, the plurality of curved regions each being immediately adjacent to each other whereby the side part is continuously undulate. Each curved region provides at least a further two circumferential wells. For each adjacent two curved regions, there is an effective angle between a plane normal to the axis of the wheel and a line struck tangentially at a point of inflection between the two curved regions at a tire side of the rim, of between 25? and 45?.

A bicycle rim has rim a pair of rim flanges that defines a tire channel. A rim strip extends across the tire channel. The rim strip includes a pair of flange bumpers configured to cover the rim flanges. The flange bumpers each define a flange channel in which one of the rim flanges is received. A pair of safety humps define corresponding tire seating sections where a tire is seated when inflated. The rim strip further includes a drop seal that seals with the beads of the tire to facilitate seating of the tire during inflation.

The present invention provides a vehicle wheel configured to assemble a motor having an uneven weight distribution. The vehicle wheel comprising a rim having an asymmetric structure. The rim comprising a drop center (202) for mounting a tire, side sections (204A-D) extending axially outward from both sides of the drop center (202), bead bases (208A-D) extending axially outwards from said side sections (204A-D), and flanges (210A-D) disposed axially outward of said bead bases. The bead bases having non symmetrical lengths to compensate the uneven weight distribution of said motor on the rim. The drop center having a drop diameter that is compatible with the diameter of the motor for inserting and encapsulating said motor therein, and the asymmetric structure of the rim compensates the uneven weight distribution of said motor on the rim, thus, maintains said wheel balanced with a minimal overall offset from the center line of the rim.

A coupling structure for coupling first and second wheel pieces includes (a) a radially-positioning coupling including a radially-positioning protrusion and a radially-positioning recess, (b) a circumferentially-positioning coupling including a circumference protrusion and a circumference protrusion-receiving recess and (c) an axially-positioning coupling including an arm and a claw receiver. As a result, even eliminating welding and coupling by a bolt, it is possible to couple the first and second wheel pieces securely by a physical coupling such as fitting, engaging, inserting and press-fitting.

A bicycle rim has rim a pair of rim flanges that defines a tire channel. A rim strip extends across the tire channel. The rim strip includes a pair of flange bumpers configured to cover the rim flanges. The flange bumpers each define a flange channel in which one of the rim flanges is received. A pair of safety humps define corresponding tire seating sections where a tire is seated when inflated. The rim strip further includes a drop seal that seals with the beads of the tire to facilitate seating of the tire during inflation.

A preform for fabricating a wheel rim and a method of making a preform is provided. The preform includes a main section and at least one secondary section, each section being formed from composite materials, such as triaxially braided composite material that includes fibers oriented in at least three directions. The main section forms at least part of a lateral section of the preform and the secondary section forms at least part of a radial portion of the preform, the radial portion of the preform being generally perpendicular to the lateral section of the preform. The preform is fabricated from a plurality of composite layers, at least some being custom composite layers having a plurality of axial fibers interwoven intermittently with substantially consistent first and second sets of biased fibers. In some embodiments, the preform is initially fabricated in an intermediate configuration prior to being moved to a final configuration.

A rim portion of a vehicle wheel has an outer flange portion. In a region of the outer flange portion, a space portion between spoke portions is disposed on a radial-direction inner side, a first inclined surface and a second inclined surface are provided. The first inclined surface is provided on an axial-direction outer side of an outer flange outer circumferential portion. The second inclined surface is on an axial-direction outer side of an outer flange inner circumferential portion. The first inclined surface is formed to incline from the axial-direction outer side toward an axial-direction inner side as the first inclined surface extends from a radial-direction outer side end toward the radial-direction inner side. The second inclined surface is a surface formed to incline from the axial-direction inner side toward the axial-direction outer side as the second inclined surface extends from the radial-direction outer side toward the radial-direction inner side.

A vehicle wheel (1) allows a communication hole (18a) for a first Helmholtz resonator (auxiliary air chamber members (10a, 10d)) having a lower resonance frequency than that of an air column resonance sound of a tire and a communication hole (18a) for a second Helmholtz resonator (auxiliary air chamber members (10b, 10c)) having a higher resonance frequency than that of the air column resonance sound of the tire to be disposed at positions facing each other across a wheel rotation center (Ax).