Page 157 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Rotor Type Oil Pump

This type of pump two rotors is mounted in one housing. The number of teeth of the outer rotor is one more than
there is after the inner rotor receives the drive, it starts rotating in the outer rotor. As the rotor rotates, the oil is
drawn in from the high clearance portion of the teeth due to the vacuum created and is expelled from the low
clearance portions

Vane Type Oil Pump
A rotor is eccentrically mounted in the pump. And spring loaded vanes are mounted on it. As the rotor rotates in
the housing, a vacuum is created through the vanes and the oil is drawn in and comes out under pressure through
the discharge tube.

Plunger Type Oil Pump
In this pump Includes cylinder, plunger, non-return valve and eccentric cam etc. A plunger is mounted in a cylinder
and is operated by a cam. As the plunger moves up in the upward stroke, the ball valve at the inlet opens and
the oil enters. At this time the ball valve on the outlet is closed. In the downward stroke, the ball valve at the inlet
closes and the ball valve at the outlet opens and the oil escapes under pressure.

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CITS : Automotive - Mechanic Diesel - Lesson 39 - 46