| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel pump which is a rotary pump having a passage with improved operating properties. SOLUTION: The fuel pump has a pump housing which contains a cover having a counter surface and a body having the counter surface. A circular passage is formed on the counter surfaces of the cover and the body. An arch shape passage is extended on the counter surface at least partially in the circumferential direction. An entrance is extended passing through the cover and is connected to the passage of the cover. An exit is extended passing through the body and is connected to the passage of the body. An impeller is arranged between the counter surface of the cover and the counter surface of the body. At least either the passage of the cover or the passage of the body has a cross section containing the lower part and the upper part along at least one part of its length part. The lower part has a semiellipsoidal shape, a partially semiellipsoidal shape or a partially semicircle shape, and the upper part has a pair of linear walls connected to the lower part. COPYRIGHT: (C)2005,JPO&NCIPI
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