| 摘要 |
PROBLEM TO BE SOLVED: To provide a small fuel pump having high reliability and small pressure fluctuation by lubricating a driving part with a lubricating fluid. SOLUTION: A mechanism part for converting rotational motion to rock motion comprises a shaft 1 for transmitting external driving force, a swash plate 1a rotated by the shaft 1 and a rocking plate 7 for converting the rotational motion of the awash plate 1a to the rock motion. The rock motion of the rocking plate 7 causes a plurality of pistons 13 to reciprocate. A crank chamber 30 housing the swash plate 1a, the rocking plate 7 and the pistons 13 is divided into a fuel chamber 36 and a mechanism chamber 34 by bellows 40. Bearings 3, 4 for transmitting the driving force between the shaft 1 and the swash plate 1a of the mechanism part and bearings 5, 6 for transmitting the driving force between the swash plate 1a and the rocking plate 7 are disposed within the mechanism chamber 34 and lubricated with the oil. The plurality of pistons 13 are disposed within the fuel chamber 36 and each sucks and discharges the fuel.
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