Rexroth Blades Pump contains stator, blade, oil distribution pan and end cap. The internal surface of the stator is a cylindrical opening. There is eccentricity in between rotor and stator. The blade can move flexibly in the slot of the blades. When the blades rotates, with the centrifugal pressure and pressure oil going into the blade root, the top of the Rexroth blade is close to the inner surface of the stator. So a sealed functioning chamber is formed in between the two adjacent blades, the oil distribution plate, the stator and the blades.

When the rotor revolves counter-clockwise, the blade on the appropriate side of the diagram prolongs outside. And the quantity of the securing chamber boosts progressively, leading to a vacuum cleaner. For that reason, the oil is drawn with the top windows of the suction port 6 and the oil distribution plate 5. And on the left side of the graph. Rexroth blade pulls back internal which makes the volume of the sealing chamber reduced. After that the oil in the sealing chamber squeezes out with one more window of the oil circulation frying pan and the pressure port 1 and exported to the system. This type of pump is single vane pump. Since it sucks oil and presses oil when in the process of blades rotation.

The blades goes through radial hydraulic out of balance stress, so it is also out of balance pump. Its bearing load is big. When transforming the eccentricity between stator and blades, the displacement of the pump can be various. So this kind of pump is also variable displacement pump.

b. The functioning concept of double vane pump.
The stator surface consists of two long radius arcs, 2 short radius arcs and four shift contours. And the stator and blades are of the same center. When the blades revolve clockwise, the quantity of the sealing chamber increases progressively at the top left and the lower right. That is the oil absorption area. The quantity of the sealing chamber decreases progressively at the lower-left and the upper right. That is the oil pressure area.

There is a securing location in between the oil suction location and the oil stress area to separate them. The blades of this pump turns one circle, and each secured working chamber completes oil suction and oil stress two times, so it is dual vane pump. Both Oil-absorbing location and two Oil pushing location of the pump are radially in proportion, and the Hydraulic pressure on the blades is radially well balanced. So they are additionally balanced vane pumps. The instant flow rate of double vane pump is pulsating, and the pulsation price is tiny when the variety of Blades is 4 times. Because of this, the variety of blades of dual vane pump is generally 12 or 16.