The function of pump is to convert mechanical energy into hydraulic energy. >It is heart of any hydraulic system because it generates the force necessary to move the load.
Mechanical energy delivered to the pump using prime mover such as an electric motor.
CLASSIFICATION OF HYDRAULIC PUMP
Classified into two categories:
- Positive Displacement Pump
- Gear Pumps
- Vane Pumps
- Piston Pumps
2.Non-Positive Displacement Pump
Centrifugal or Impeller Pump
Axial Propeller Pump
External Gear Pump
Fig. shows an external gear pump.
It consists of two spur or helical gears, which are meshed with each other and mounted inside the casing.
One is driver and other is driven.
When the driver is rotated by means of any prime mover (i.e. electrical motor), driven will also rotate.
Thus partial vacuum is created at the inlet of the pump.
Oil is forced to enter the pump by atmospheric pressure.
Oil is trapped in the pockets between teeth and the casing and carried towards the outlet port.