Abstract: A modified vehicle-used crankset composite structure, comprising an inner ring piece made from a lightweight metal and a tooth ring; the inner ring surface of the inner ring piece is equally divided and extends to form a plurality of arm-like fixing portions in the radial direction; the outer edge of the inner ring piece is equally divided to form a plurality of the first tooth portion in the radial direction; the two side surfaces of the first tooth portion respectively form a first engaging surface; a second engaging surface is disposed on one side surface of the tooth ring; the outer edge of the tooth ring is equally divided to form a plurality of the second tooth portions.

Abstract: A modified vehicle-used brake disc composite structure, comprising an inner ring piece made from a lightweight metal and a disc body having a high rigidity, wear-resistance and heat-resistance; the inner surface of the inner ring piece is equally divided and extends to form a plurality of arm-like fixing portions; a ring piece is disposed at the outer edge of the inner ring piece; the two side surfaces of the ring piece respectively form a first engaging surface; the disc body is provided with a plurality of annular-shaped heat-dissipation holes; a second engaging surface is disposed on one side of the disc body; the two side surfaces of the inner ring piece are respectively pressed by the two disc bodies, enabling the second engaging surfaces to be respectively fixed to the first engaging surfaces via friction welding method so as to form the brake disc.

Abstract: A vehicle-used crankset composite structure, comprising an inner ring piece made from a lightweight metal and a rigid tooth ring having a high wear-resistance and heat-resistance; a first joint surface is disposed on the inner ring piece; an inner ring hole is provided in the middle of the tooth ring; a second joint surface is disposed on the tooth ring; through welding the second joint surface to the first joint surface, the inner ring piece can be fixed into the tooth ring, and the inner ring hole of the tooth ring can be covered by the inner ring piece; according to the present invention, the integrality of the crankset can be greatly improved, achieving a lightweight structure and a high rigidity of the tooth portions.

Abstract: A vehicle-used brake disc composite structure, comprising an inner ring piece made from a lightweight metal, and a disc body having a high rigidity, wear-resistance and heat-resistance; the inner ring piece is provided with a first engaging surface; an inner ring hole is disposed in the middle of the disc body; the disc body is provided with a second engaging surface, which is used to be fixed to the first engaging surface via welding method; the inner ring hole is covered by the inner ring piece; through fixing the inner ring piece to the disc body via welding method, the integral strength of the brake disc can be improved, and the functional life can be prolonged.