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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 sl

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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A hydraulic vane pump comprising: a housing; a cam ring disposed in the housing and having an inner peripheral surface formed in a cam configuration; a drive shaft rotatably mounted in said housing; a rotor connected coaxially to said drive shaft for being driven thereby, said rotor having a plurali

A hydraulic vane pump comprising: a housing; a cam ring disposed in the housing and having an inner peripheral surface formed in a cam configuration; a drive shaft rotatably mounted in said housing; a rotor connected coaxially to said drive shaft for being driven thereby, said rotor having a plurality of vane slots defined radially in an outer peripheral wall of said rotor and fluid reservoir slots for introducing a fluid provided at the bottom of said vane slots; a plurality of vanes slidably inserted in said vane slots; a plurality of vane chambers defined among said rotor, said vanes and said cam ring; and inlet and outlet ports defined in said housing and connected to said vane chambers; wherein the inner peripheral surface of the cam ring is composed of the following sections per one period of said cam configuration: a small-arc section of minimum value of vane lift changing, an expansion section of increasing vane lifting having a maximum value of vane lift changing quantity at the end thereof, a large-arc section of vane lift in which the vane lift decreases from the maximum value by no more than a slight amount, and a compression section of decreasing vane lifting, wherein the inner peripheral surface of the cam ring is formed to have a ratio being in the range of 0.020 to 0.032 of maximum value of vane lift changing quantity per unit rotational angle of a 1/180 period of cam configuration, to the maximum value of vane lift, in the expansion section of said inner peripheral surface of said cam ring, wherein a region having a lift increasing amount per unit rotational angle of at least 95% of the maximum value of said vane lift changing quantity per unit rotational angle is formed in the range of 5 to 18% of a rotational angle of a period of cam configuration, and wherein a region having a lift increasing amount per unit rotational angle of at least 5% of the maximum value of said vane lift changing quantity per unit rotational angle is formed in the range of 25 to 35% of a rotational angle of a period of cam configuration, thereby reducing pressure variation of discharged fluid flow from said vane pump by properly controlling maximum vane velocity and the followability against the inner peripheral surface of said cam ring in the expansion section of cam configuration.