| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel pump capable of lengthening the service life of a metal mold for molding an impeller, by improving processing accuracy of the impeller, while restraining cost of the metal mold. SOLUTION: A plurality of blade parts 21 are formed near the outer periphery of the impeller 18. Circular recessed parts 24 and 25 with an output shaft as the center, are respectively formed on both side surfaces of the impeller 18. An output shaft hole 26 is formed in the center of these recessed parts 24 and 25. A plurality of through-holes 29 penetrating in the plate thickness direction are arranged at an equal interval in the peripheral direction on the same circle with the output shaft hole 26 as the center. A plurality of ejector pin pushing-out positions 33 are set outside in the radial direction more than the through-holes 29 on a concentric circle with the through-holes 29 on a core side surface 30 of the impeller 18. Gate positions 32 of the same number as the through-holes 29 are set inside in the radial direction more than the through-holes 29 on the concentric circle with the through-holes 29 on a cavity side surface 31 of the impeller 18. These gate positions 32 are respectively set in the substantial center between the through-holes 29. COPYRIGHT: (C)2009,JPO&INPIT
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