a. Balanced Vane (Pump Fan balanced)
This pump uses the pump house inside elliptical and there are two entry holes (inlet) and two drain holes outlet whose position opposing directions. Created so that radial pressure of hydraulic fluid negate each other so that there was a balance (balanced) Vane (fan) that looks like the image 8b mounted on the shaft grooved (slots) and due to the centrifugal force during rotor rotates the vanes always docked at the pump house and become involved in the process pumping.
Figure 7. Vane Pumps
Figure 8. Vane
b. Radial piston pump (Radial Piston Pump)
The piston pump to pump radial movement that is perpendicular to the shaft. The piston is driven by a crankshaft (eccentric crankshaft) so a big step piston is at the radius of the crankshaft. Sucking occurs when the piston is open so that the hydraulic oil from the crankshaft into the cylinder. At step pumping pressured fluid from each cylinder through a check valve to drain tap. These pumps can achieve pressures up to 63 MPa.
Figure 9. Radial piston pump
c. Bent axis piston pump (piston pump with the shaft bending)
In this pump cylinder block rotates at an angle in order to rotate the shaft. The piston rod mounted on the flange shaft using a ball joint. Big step piston depend on the angle of bend. For fixed displacement piston pump of the angles (offset Engle) ranges from 25 0.
Figure 10a. Bent axis piston pump
Movement of the piston step we can see in the image 10b.
The maximum step – the maximum angle
Step reduction – reduced angle
Without Step – straight
Figure 10b. TorakBent step movement axis piston pump
Selection of hydraulic pump can see the characteristics of the various pump. These characters can be seen in a comparison table of the characteristics of a variety of hydraulic pumps
Table comparing the characteristics of a variety of hydraulic pumps,
