| 摘要 |
PROBLEM TO BE SOLVED: To constitute a fuel pump to have excellent pump efficiency. SOLUTION: The groove face shape of a blade groove 12c provided to form a closed blade type blade 12c formed at the outer periphery of an impeller 12, and that of recessed grooves 8e, 9d formed at first and second plates 8, 9 disposed in a closely facing state at the impeller 12 are formed on the basis of a cycloid curve.
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