Resin wheel with more than two independently molded parts

Claim 2

A resin wheel comprising a rim and a disk, said wheel being formed of a plurality of independently molded parts, said independently molded parts having fitting portions to be screwed into each other for constituting said wheel, said fitting portions having screw threads and ratchets formed on the screw threads, said ratchets inclining in a direction to allow the molded parts to engage together along the screw threads and to prevent the fitting portions from loosening to thereby enhance the strength of the wheel, said wheel being formed of a mixture of a thermoplastic resin, a long-fiber reinforced thermoplastic resin, and a short-fiber reinforced thermoplastic resin by one of compression molding, injection molding and injection compression molding methods.

Claim 3

The resin wheel of claim 1, wherein the wheel includes two independently molded parts divided at the rim, the two parts being coupled together.

Claim 4

The resin wheel of claim 1, wherein the wheel includes more than two independently molded parts divided at the disk, all the parts being coupled together.

Claim 5

The resin wheel of claim 1, wherein the wheel includes more than three independently molded parts divided at the rim and the disk, all the parts being coupled together.

Claim 6

The resin wheel of claim 1, wherein the fitting portion of one of the independently molded parts has an external thread, and the fitting portion of another of the independently molded part has an internal thread into which the external thread is screwed.

Claim 7

The wheel of claim 1, wherein adhesive is put between the fitting portions of the independently molded parts.

Claim 8

The wheel of claim 1, wherein the fitting portions of the independently molded parts are bonded together by melting.

Claim 9

The resin wheel of claim 1, further comprising a heat insulator formed at least on a part of surfaces of the disk and the rim on a side of a brake drum.

Claim 10

The resin wheel of claim 1, wherein the thermoplastic resin is a partial aromatic polyamide resin.

Claim 11

The resin wheel of claim 1, wherein a blending amount of the fibers to the resin is 5 to 70% by volume, and a mixing ratio of said short-fiber reinforced resin is less than 70% by weight of a total amount.

Claim 12

The resin wheel of claim 1, wherein a length of said long-fibers is a 1 to 30 mm, and a length of said short-fibers is 0.1 to 0.5 mm.

Claim 13

The resin wheel of claim 1, wherein the reinforcing fibers comprise at least one of glass, carbon, graphite, aramide, polyethylene, ceramic and metal.

Claim 14

The resin wheel of claim 1, wherein said long-fiber reinforced thermoplastic resin has forms of grains before mixed with the other materials, said long-fiber reinforced thermoplastic resin being prepared by passing rovings of reinforcing fibers through a molten thermoplastic resin at a low viscosity to impregnate mono-filaments thereof with the resin, cooling the reinforcing fibers with the resin to solidify, and cutting the continuous rovings with the resin into a predetermined length to obtain the grain material of fibers.

Claim 15

The resin wheel of claim 1, wherein each independently molded part has a plurality of the fitting portions radially and axially spaced apart from each other so that the radially and axially spaced fitting potions of the one molded part engage radially and axially spaced fitting portions of the other molded part.

Claim 16

The resin wheel of claim 14, wherein the radially and axially spaced fitting portions of the independently molded parts are tightened together by one of a bolt and rivet.

Claim 17

A resin wheel comprising a rim and a disk, said wheel being formed of a plurality of independently molded parts, said independently molded parts including fitting portions to be coupled together for constituting the wheel, said fitting portions having screw threads and ratchets formed on the screw threads, said ratchets inclining in a direction to allow the molded parts to engage together along the screw threads and to prevent the fitting portions from loosening to thereby enhance the strength.

Claim 18

A resin wheel comprising a rim and a disk, said wheel being formed of a plurality of independently molded parts, said independently molded parts including fitting portions to be coupled together for constituting the wheel, said fitting portions having screw threads and ratchets formed on the screw threads, said ratchets inclining in a direction to allow the molded parts to engage together along the screw threads and to prevent the fitting portions from loosening to thereby enhance the strength.

Claim 19

The resin wheel of claim 16, further comprising a heat insulator formed at least on a part of surfaces of the disk and the rim on a side of a brake drum.

Claim 20

A resin wheel comprising a rim and a disk, said wheel being formed of a plurality of independently molded parts, said independently molded parts including fitting portions to be coupled together for constituting the wheel, said fitting portions having screw threads and ratchets formed on the screw threads, said ratchets inclining in a direction to allow the molded parts to engage together along the screw threads and to prevent the fitting portions from loosening to thereby enhance the strength, said wheel being formed of a mixture of a thermoplastic resin, a long-fiber reinforced thermoplastic resin and a short-fiber reinforced thermoplastic resin, a blending amount of the fibers to the resin being 5 to 70% by volume and a mixing ratio of said short-fiber reinforced resin being less than 70% by weight of a total amount, said long-fiber reinforced thermoplastic resin having forms of grains before mixed with the other materials, said long-fiber reinforced thermoplastic resin being prepared by passing rovings of reinforcing fibers through a molten thermoplastic resin at a low viscosity to impregnate monofilaments thereof with the resin, cooling the reinforcing fibers with the resin to solidify, and cutting the continuous rovings with the resin into a predetermined length to obtain the grain material of fibers.

Claim 21

A resin wheel comprising a rim and a disk, said wheel being formed of a plurality of independently molded parts, said independently molded parts including fitting portions to be coupled together for constituting the wheel, said fitting portions having screw threads and ratchets formed on the screw threads, said ratchets inclining in a direction to allow the molded parts to engage together along the screw threads and to prevent the fitting portions from loosening to thereby enhance the strength, said wheel being formed of a mixture of a thermoplastic resin, a long-fiber reinforced thermoplastic resin and a short-fiber reinforced thermoplastic resin, a blending amount of the fibers to the resin being 5 to 70% by volume and a mixing ratio of said short-fiber reinforced resin being less than 70% by weight of a total amount, said long-fiber reinforced thermoplastic resin having forms of grains before mixed with the other materials, said long-fiber reinforced thermoplastic resin being prepared by passing rovings of reinforcing fibers through a molten thermoplastic resin at a low viscosity to impregnate monofilaments thereof with the resin, cooling the reinforcing fibers with the resin to solidify, and cutting the continuous rovings with the resin into a predetermined length to obtain the grain material of fibers.