
Thus, shoulder (10) of slide valve (6) seals off passage (1) connecting the governor with the airscrew.
The oil contained in the airscrew space is confined within the latter.
Acted upon by the centrifugal force moments of the counterweights installed on the blade sleeves, the
blades tend to turn "towards higher pitch, but the oil retained in the airscrew cylinder precludes them from turning
so that the pitch remains constant.
Since airscrew pitch change oil flow is zero, the oil from the governor pump is pumped through reducing
valve (9) back to the inlet to the governor pump.
If with changing of flight conditions or engine rating the airscrew speed drops, the speed of rotation of
the centrifugal governor and centrifugal force of its weights drop accordingly.
Thus, slide valve (6) is made by excessive force of spring (3) lower down (Ref. Fig. 6).
As slide valve (6) moves down, passage (1) gets connected with the governor oil pump high-pressure
space* The oil ia fed via passage (1) to the airscrew to decrease its pitch.
As the airscrew pitch decreases, the engine speed starts rising, centrifugal force of weights (2) increases
and the weights overcome the force of spring (3)tmove slide valve (6) upward to the initial equilibrium position
(Ref- Fig. 5).
Depending on the rate of deviation of the airscrew speed of rotation from the equilibrium speed, when
the mismatch is eliminated the slide valve may overshoot the equilibrium position, upward and then downward
but the entire system will be balanced in one or two such overshoots.
If the engine speed increases for some reasons, the speed of rotation of drive shaft (11) (Ref. Fig. 7) of
the governor increases as well, hence the speed of centrifugal governor weights (2) secured on the shaft.
As the weight speed increases, weight centrifugal force rises to exceed the force of spring (3). Excessive
force will move the weights aside from each other and their short arms will compress the spring while lifting slide
valve (6). As slide valve (6) moves upward, passage (1) gets connected with the return line leading to the engine
gearbox case. Oil will flow to the return line from the airscrew cylinder.
The counterweight centrifugal forces will move the airscrew blades towards higher pitch.
As the airscrew pitch increases, the engine speed drops down, centrifugal force of weights (2) reduces
and spring (3) lowers slide valve (6) to the initial position whereat oil return from the airscrew cylinder ceases
and the airscrew again runs at preset equilibrium speed of rotation (fief. Fig. 5).
Содержание M-14P
Страница 6: ...19 Engine M 14P Front View Figure 1...
Страница 7: ...20 Engine M 14P Rear View Figure 2...
Страница 27: ...40 Arrangement of Airborne Tools in Case Figure 1...
Страница 39: ......
Страница 44: ...57 Engine M 14P Test Run Chart Figure 201...
Страница 67: ...80...
Страница 163: ...176 Crankshaft Thrust Ball Bearing Front Cover Figure 1 Intermediate Crankcase Figure 2...
Страница 166: ...179 Intermediate Grankcase Front Portion Figure 3 Intermediate Crankcase Rear Portion Figure 4...
Страница 173: ...186 Front view Cylinder Figure 1 Rear view...
Страница 174: ...187 1 Inlet Valve 2 Outer Spring 3 Inner Spring 4 Split Retainer 5 Valve Plate Inlet Valve Figure 2...
Страница 178: ...191 Intake Pipe of Cylinders Nos 4 5 and 6 Figure 4 Piston Piston Rings and Piston Pin with Plugs Figure 5...
Страница 180: ...193 Timing Mechanism Schematic Diagram Figure 6 Cam Plate Figure 7...
Страница 189: ...Blower Longitudinal Section View Figure 1...
Страница 191: ...Rear view Mixture Collector Figure 2 Diffuser Figure 3...
Страница 194: ...1 Plate 2 Spring 3 Plate 4 Gear 5 Accessory Drive Shaft Blower Coupling Figure 4...
Страница 204: ...Oil Sump Figure 4...
Страница 216: ...Engine M 14P Gear Train Figure 1...
Страница 247: ...Carburetor AK 14P Operation Diagram Figure 1...
Страница 249: ......
Страница 267: ...OPERATIONS AND TECHNICAL REQUIREMENTS CORRECTIVE ACTIONS CH ECKED BY Carburetor AK 14P Right Side View Figure 201...
Страница 273: ...Carburetor Altitude Control Needle Position Versus Barometric Pressure Barometric Graph Figure 203...
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Страница 288: ...T t en 0 CO 0 T K D fi h0 Ol f 01 3 0 F4...
Страница 293: ......
Страница 309: ...SPARK PLUG SD 49SMM MAINTENANCE PRACTICES 1 LIST OF TASK CARDS Title Task Card Uo Removal 201 Installation 202...
Страница 344: ...Generator Electrical Connection Diagram Commutator Side View Figure 3 1 Main Pole 2 Interpole...
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