| 摘要 |
PURPOSE: A brake disk for a vehicle is provided to improve cooling performance by forming plural protrusions inducing airflow to air holes and to improve durability and damping force. CONSTITUTION: A brake disk(30) for a vehicle forms plural air induction protrusions(38) inclined in the rotation direction at air induction holes, to induce airflow to cooling holes(34) formed on the outer peripheral surface of the brake disk between long ribs(40) and short ribs(41). The air induction protrusions are formed on the outer peripheral surface of a coupling plate(32) between the long ribs, with inclined. If the brake disk rotates in the rotation direction, some of air flowing along the air induction grooves, flows into the cooling holes and some of the air induces airflow toward the cooling holes while colliding with the air induction protrusions. Therefore, sufficient supply of air into the cooling holes is performed and the disk brake heated by frequent braking is quickly cooled.
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