What moves the swash plate away from the minimum stroke position?
- Reduced inlet pressure.
- A spring.
- Increased servo pressure.
Explanation
The servo pressure acting on the swash plate drives it toward minimum stroke. A spring provides the opposing force that moves the plate away from minimum stroke, ensuring maximum delivery for starting and when servo pressure is low. Balance between spring force and servo pressure sets the running stroke.
mwongela asking:
what moves the swash plate towards the minimum stroke position?
Community Comments (2)
M
malowth Posts: 5 26.11.2012 / 06:13
Fuel pressure I believe, but check it, I could be wrong.
J
JD2016 Posts: 54 10.04.2017 / 01:36
All of these different kinds of fuel system are very complex and confusing!
But the best guidance I can find is Page 113 of the Rolls Royce Jet Engine book. Figure 10-14 is a nice cut-away view of a swash-plate fuel pump and you can clearly see that the servo piston rod has a spring (actually 2 coaxial,concentric springs) pushing the piston and therefore the swashplate, towards the maximum delivery position (i.e. greatest swash plate angle) and away from minimum.
Para. 87 on Page 114 says: " The stroke of the plungers is determined by the angle of inclination of the camplate. The degree of inclination is varied by the movement of a servo piston that is mechanically linked to the camplate and IS BIASED BY SPRINGS TO GIVE THE FULL STROKE POSITION OF THE PLUNGERS."
But the best guidance I can find is Page 113 of the Rolls Royce Jet Engine book. Figure 10-14 is a nice cut-away view of a swash-plate fuel pump and you can clearly see that the servo piston rod has a spring (actually 2 coaxial,concentric springs) pushing the piston and therefore the swashplate, towards the maximum delivery position (i.e. greatest swash plate angle) and away from minimum.
Para. 87 on Page 114 says: " The stroke of the plungers is determined by the angle of inclination of the camplate. The degree of inclination is varied by the movement of a servo piston that is mechanically linked to the camplate and IS BIASED BY SPRINGS TO GIVE THE FULL STROKE POSITION OF THE PLUNGERS."
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