HYDRAULIC PUMP

• 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:

1. Positive Displacement Pump
2. Gear Pumps
3. Vane Pumps
4. 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.