| 摘要 |
PROBLEM TO BE SOLVED: To provide a pump of a simple structure using a cam mechanism. SOLUTION: A piston 4 in a cylinder 2 is rotated while allowing reciprocation in an axial X direction. A suction port 91 and a delivery port 92 is formed on a cylinder in such a manner that the same can communicate with a cell formed out of piston end surfaces 41A, 41B, a cylinder inner circumference surface 21, end surface member inner end surfaces 31A, 31B, and a rotary shaft outer circumference surface 61. The piston end surfaces 41A, 41B and the cylinder inner end surfaces 31A, 31B are biased by a compression coil spring 33 to approach each other. A shape of the piston end surface and a shape of the cylinder inner end surface are determined in such a manner that the volume of the cell changes during a piston rotation motion. Notch parts 42A, 42B formed on a piston outer circumference surface are formed in such manners that the same can communicate with the suction port 91 and the delivery port 92 during piston reciprocating motion in the axial X direction, and that the same can selectively communicate with the suction port 91 and the delivery port 92 during piston rotation motion in a circumference direction. COPYRIGHT: (C)2009,JPO&INPIT
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