| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold gear having the function as a cooling fan and capable of generating forced convection (an air flow) in a housing space. SOLUTION: An injection molding plastic gear 1 as the mold gear forms plural teeth 12 on the outer periphery of a rim 11, and blades 8 for generating a shaft directional air flow in the peripheral direction of an inner peripheral surface of the rim 11 are formed in a pluraility at intervals. A radial directional inside part for supporting the rim 11 via these blades 8 is formed on the inner peripheral side of the blades 8. When rotating such an injection molding plastic gear 1, the blades 8 generate the shaft directional air flow turning to the reverse side from the obverse side by passing through a hole 10, and the air flow is blown upon a part such as the adjacently arranged other IC and a motor, and the part is cooled, and heat of the teeth 12 and the rim 11 is deprived of by heat transfer, and the teeth 12 and the rim 11 are cooled. |
