| 摘要 |
A vane pump comprising a housing having front and rear surfaces and formed with a cam ring housing portion which is open to the front surface, the housing being further formed at its inner peripheral wall with recess portions and an axial bore extending from the rear surface, said axial bore being open to a center of the ring housing portion; a drive shaft freely rotatably supported in the axial bore of the housing; a rotor inserted on the drive shaft and engaged with the drive shaft, the rotor having a plurality of slits and a plurality of vanes each projectable from and retractable in the corresponding slit; a cam ring having at its inner peripheral wall a cam surface which is arranged to enclose the rotor therein and form pump chambers in cooperation with the vanes, the cam ring being formed at its outer peripheral wall with recess portions of substantially semicircular configuration in cross section; a front end plate by which the cam ring is closed at its one end; a rear end plate formed with a bearing portion through which one end portion of the drive shaft is freely rotatably supported, the rear end plate also formed with at least a pair of openings, each of the openings being spaced at a predetermined distance from a center axis of the bearing portion of the rear end plate; and knock pins fixedly inserted in the openings of the rear end plate, disposed to engage the cam ring in the semicircular recess portions of the cam ring, and disposed with clearance in bores defined by the recess portions of the housing so that the cam ring is held and positioned only with respect to the rear end plate.
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