A brake disk includes a body and at least two heat dissipation members. The body has an annular portion defined thereon, and the annular portion of the body defines a central axis. The annular portion has a brake portion for a bike brake device to clamp the brake portion. The body has at least one assembling portion extended toward the central axis for connecting with a bike hub. At least one connecting portion is formed between the assembling portion and the brake portion. The connecting portion has at least one first fixing portion formed thereon. The two heat dissipation members are respectively located on two corresponding lateral sides of the body. Each heat dissipation member has at least one second fixing portion, the second fixing portion is fixedly assembled to the first fixing portion.
1. A brake disk comprising:
a body formed integrally having an annular portion defined thereon, the annular portion of the body defining a central axis, the annular portion having a brake portion which is remote from the central axis for a bike brake device to clamp the brake portion, the body having at least one assembling portion extended toward the central axis for connecting with a bike hub, at least one connecting portion formed between the assembling portion and the brake portion, the connecting portion having at least one first fixing portion formed thereon; and
at least two heat dissipation members respectively assembled at two corresponding lateral sides of the connecting portion, each heat dissipation member having at least one second fixing portion, the second fixing portion fixedly assembled to the first fixing portion;
wherein the at least one assembling portion includes plural assembling portions formed thereon; each assembling portion is formed as substantially V-shaped or Y-shaped and has two arms; a connecting position of the two arms is connected with the connecting portion; each arm of each of the plural assembling portion is connected with an adjacent arm of an adjacent one of the plural assembling portion, so that the assembling portions perform as substantially a radial structure; an assembling hole is formed on one said connecting position between two connected arms of every two adjacent assembling portions.
2. The brake disk as claimed in claim 1 , wherein each heat dissipation member is formed as substantially annular-shaped and is coaxial to the body; each heat dissipation member is made of an aluminum alloy; a circular hole is formed at the center of the heat dissipation member; each heat dissipation member has a plurality of elongated holes defined around the central axis; each elongated hole communicates with the circular hole.
3. The brake disk as claimed in claim 1 , wherein the annular portion near the axis of the body has a plurality of heat dissipation portions radially protrudingly extended toward the central axis; the heat dissipation portions are defined around the central axis, and the heat dissipation portions are intervally arranged; each heat dissipation member is connected with the heat dissipation portions, and the heat dissipation member partially overlaps each heat dissipation portion.
4. The brake disk as claimed in claim 3 , wherein the body has at least one convex portion formed between each two adjacent heat dissipation portions, and the convex portion is radially extended toward the central axis for increasing a surface area, which contacts ambient air, of the body.
5. The brake disk as claimed in claim 1 , wherein plural heat dissipation holes are disposed through the brake portion along a direction which is parallel to the central axis; the heat dissipation holes are defined around the central axis.
6. The brake disk as claimed in claim 1 , wherein each heat dissipation member is formed as substantially annular-shaped and is coaxial to the body; each heat dissipation member has plural convex ribs formed at a side thereof which is opposite to the body, for increasing a surface area, which contacts ambient air, of the heat dissipation member; the convex ribs are defined around the central axis; each convex rib protrudes in a direction parallel to the central axis.
7. The brake disk as claimed in claim 1 , wherein each heat dissipation member includes plural heat dissipation blocks; the heat dissipation blocks are arranged on the body in sequence and are defined around the central axis; each heat dissipation block has at least one second fixing portion formed thereon; the second fixing portion of each heat dissipation block is assembled to the first fixing portion of the connecting position of the body so as to fixedly connect the heat dissipation member to the body.
8. The brake disk as claimed in claim 7 , wherein each heat dissipation block has plural convex ribs formed at a side thereof which is opposite to the body, for increasing a surface area, which contacts ambient air, of the heat dissipation member; each convex rib protrudes in a direction parallel to the central axis.