| 摘要 |
PROBLEM TO BE SOLVED: To maintain sufficient capacity with a single coil spring while preventing the falling of the coil spring for energizing a vane for a vane pump. SOLUTION: A vane 35 slidably fitted into a vane groove 321 radially formed in a rotor 32R for a vane pump PR is energized to the radial outside toward the inner periphery of a cam ring 29R with a single coil spring 36 in sectionally elliptical shape having a major diameter in the axial direction (cross direction as shown in the figure) of the rotor 32R and a minor diameter in the circumferential direction (perpendicular to the sheet) of the rotor 32R. The coil spring 36 is surely prevented from falling to the axial direction of the rotor 32R along its major diameter for granting stable energizing force to the vane 35 and the coil spring 36 is increased in capacity while being arranged in a limited space, without increasing the number and size of the coil spring 36, decreasing the number of windings and increasing the length of a set.
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