Oil pumps - aircraft engine, Other Engineering

OIL PUMPS

The oil pumps fitted in a recirculatory system are normally gear-type or Gerotor type pumps. The pumps are usually mounted in a pack containing one pressure pump and several scavenge pumps. They are driven by a common shaft through the engine gear train.
Gear type pumps require suitable machining of the gear teeth, or the provision of a milled slot in the casting (adjacent to the delivery side of each pump), to prevent pressure locking of the gears.

Gerotor type pumps use an inner and outer rotor, where the inner rotor is driven by the engine, and the outer rotor which has an extra gear tooth rotates with it. The inner rotor is eccentric to the outer and it is the stepping of the teeth that pumps the oil. The pump also requires kidney shaped slots as inlet and outlet ports.

303_oil pump.png

The scavenge pumps have a greater capacity than the pressure pump to ensure complete scavenging of the bearings in a dry sump system. Furthermore, air tends to leak into the bearing housings from the air pressurised seals and this aeration of the oil means that the scavenge pumps have to pump an increased oil/air volume. As we saw in the previous paragraph the air is subsequently removed by the de-aerator.

 

Posted Date: 9/12/2012 2:55:47 AM | Location : United States







Related Discussions:- Oil pumps - aircraft engine, Assignment Help, Ask Question on Oil pumps - aircraft engine, Get Answer, Expert's Help, Oil pumps - aircraft engine Discussions

Write discussion on Oil pumps - aircraft engine
Your posts are moderated
Related Questions
FIRING ORDER If in multi cylinder engines, various cylinders are made to fire one after the other, interference between adjacent cylinders would occur, since these may have o

how rayleigh scattering occurs in optical fiber cable

equivalent circuit of tunnel diode

differences between blast , reverbatory and electric furnaces

Q. Describe shell moulding process merits and demerits . Ans. Shell moulding process           Merits                                                   (i) Bett

ELECTRICAL DE-ICING SYSTEM MAINTENANCE: Tests of the system must be carried out when the servicing schedule required it or when a component has been replaced.  Typical tests ar

in the circuit what is the voltage at point with respect to ground

Guidance Control system The control aspect of the guidance system is intended to stabilise the behaviour of the airframe.  The fact that the guidance system will always h

Actuators  The actuator consists of the control surfaces and associated servomechanisms, and is used to change the missile attitude and trajectory or flight path.

Operating System Assignment# Priority Scheduling leads to the risk of starvation: a process is ready, but never is given the processor. Some preemptive priority schedulers therefor