1. Gear Pump
This is used most often in hydraulic cranes.
[Features]
* Construction is simple but strong.
* It is small and light-weight.
* It does not break down often, and is easy to maintain.
* It is low in price.
* Many models from low pressure to high pressure are available.
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External type pumps are used in hydraulic cranes.
When the gears inside the casing rotate, a vacuum is produced
at the point where the teeth disengage each other, and fluid
is drawn in through the intake. This fluid fills the spaces between
the teeth and is carried around the circumference of the casing
by the rotation of the gears. It is then ejected through the
outlet. The maximum output pressure is about 210 kg/cm². |
2. Piston Pump(Plunger Pump)
[Features]
* It is highly efficient because there is little internal leakage.
* Some pumps are of variable volume type.
With the same speed of rotation, different flows can be obtained.
* It is appropriate for high pressure.
* It is high in price.
* The hydraulic pressure with less pulse can be provided. |
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Axial fixed cam plate pumps are often used in
hydraulic cranes.
In an axial pump, the piston (plunger) causes oil to be sucked in and then discharged. In piton pumps, the sliding portions of the cylinder and piston are long. Because of this, there is little oil leakage, and these pumps are well suited for high pressure pumping.
A fixed cam plate works by rotating the drive axis which is incorporated into the cylinder itself. This rotating motion causes the piston to move away from and closer to the cam plate, creating a pumping action. |
3. Vane Pump
[Features]
* It operates quickly.
* It is appropriate for low to middle pressure.
* It is low in price. |
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| As the rotor rotates, the attached vanes enter and exit,
and the volume of the spaces between the vanes changes, creating
a pumping action. Because vane pumps are quiet, they are eventually
used in steering circuits. There are fixed volume and variable
volume models for vane pumps as well. |
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