| 摘要 |
A hydraulic vane which includes a housing; a cam ring disposed in the housing and having an inner peripheral surface formed in a cam curve; a drive shaft rotatably mounted in the housing; a rotor connected coaxially to the drive shaft for being driven thereby, the rotor having a plurality of vane slots defined radially in an outer peripheral wall of the rotor and fluid reservoir slots for introducing a fluid provided at the bottom of the vane slots; a plurality of vanes slidably inserted in the vane slots plurality of vane chambers defined among the rotor, the vanes and the cam ring and inlet and outlet ports defined in the housing and connected to the vane chambers wherein the maximum slanting angle of the inner peripheral surface of the cam ring in an expansion section of the cam curve has a ratio in the range of 0.9 to 1.7 to a slanting angle in an expansion section of a reference cam curve. This structure suppresses the maximum speed at which the vanes are lifted in the expansion section limit the quantity of the fluid supplied to the bottoms of the vanes to a certain range, and reduces the quantity of fluid to be supplied, thereby suppressing the ripples of the instantaneous flow discharged from the vane pump and reducing the amplitude of pressure pulsations in a discharge line of a hydraulic system.
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