| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel pump with high pumping efficiency. SOLUTION: An impeller 30 has blade pieces 31 around the whole surface of its outer circumferential edge. Partitions 36 are disposed in grooved spaces 39 formed between the circumferentially adjoining blade pieces 31 and partition parts of the grooved spaces 39 in an approximately center of the width in the rotational shaft direction of the impeller 30 from the roots of the blade pieces 31. The root side of the blade piece 31 is inclined rearward in the rotational direction, while its tip side in the diametrical outside is inclined frontward in the rotational direction. A recess in a front face 32 is gradually and sequentially reduced from the root of the blade piece 31 toward the tip in the diametrical outside and sequentially enlarged inward from the both ends in the rotational shaft direction. The recess in the root side of the front face 32 is large so that the fuel easily flows from the root side of the blade piece 31 towards the grooved space 39 by the rotation of the impeller 30. The recess of the front face 32 is reduced so that the flow rate of the fuel flowing to the tip side of the grooved space 39 increases.
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