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Woodward UG-8 Governor
(Electric Set Application When Frequency Control is Important)There is no direct mechanical link between the governor weights and fuel rack or carburetor. Movement of the rack or carburetor is done by a hydraulic piston which is operated by action of the governor weights and a compensating piston.
WOODWARD UG-8 GOVERNOR
1. Synchronizing motor. 2. Synchronizer knob. 3. Speed droop knob. 4. Compensating pointer. 5. Synchronizer indicator. 6. Load limit knob. 7. Plug.Engine rpm is controlled by changing the compression of the governor spring. An A. C. motor (1) installed on the top of the governor permits remote control of the spring compression.Synchronizer knob (2) on the governor permits control of the same function (engine rpm). The synchronizer indicator (5) below the synchronizer knob, gives an indication of the number of revolutions of the synchronizer knob and the amount of compression of the governor spring.A speed droop knob (3) permits a means of changing the difference between FULL LOAD rpm and HIGH IDLE (without load) rpm. Any difference between HIGH IDLE rpm and FULL LOAD rpm is called "DROOP" and this difference in rpm divided by the FULL LOAD rpm is called "DROOP PERCENTAGE". At zero droop the rpm is the same, either with or without load. This droop control permits the use of two or more electric sets to operate a common load (in parallel). Only one of the electric sets (with zero droop) feels the difference in power needs and permits the increase or decrease in power. The electric set or sets with high droop governors control the constant load.A load limit knob (6) is for the operator to manually control the engine rpm. This knob gives a positive stop to linkage movement and gives the operator a fast way to stop the engine. The load limit knob also can be used to make a gradual reduction in engine rpm.Compensating pointer (4) gives the governor a fine degree of adjustment control. Detailed information about governor adjustment is in the TESTING AND ADJUSTING section of this manual.Plug (7) covers an adjustment screw that permits the operator to release (bleed) air from the governor hydraulic system. Loosening the screw causes the hydraulic components to move rapidly and remove air from the system. Final adjustment of the needle valve controls governor action.Woodward PSG Governor
The Woodward PSG Governor is a hydraulic speed governor with a system for compensation of the small movements of the governor weights and spring which would cause a change in the engine rpm. The governor will cause the engine to keep the same speed when there is a change in the load on the engine.The oil supply is from the engine lubrication system. This oil goes to the governor oil pump (7) which makes an increase in pressure to 175 psi (12.3 kg/cm2). Four check valves permit rotation of the governor in either direction. Oil from the relief valve goes back to the supply, so oil which is not used in pumped to the components inside the governor.
SCHEMATIC OF OIL FLOW IN GOVERNOR
1. Check valves. 2. Governor weights. 3. Linkage to fuel rack or carburetor throttle. 4. Return spring. 5. Terminal lever. 6. Power piston. 7. Pump. 8. Supply valve (pressure controlled). 9. Hydraulic valve bushing and governor drive shaft. 10. Drain. 11. Pilot valve plunger.The governor drive shaft is the hydraulic valve bushing (9). The pilot valve plunger (11) in the center of the bushing is installed in the thrust bearing and spring seat (12). The rotation of the bushing causes governor weights (2) to turn. The toes of the weights are against the thrust bearing and the spring seat. One of the hydraulic pump gears is made as part of the bushing (9).When there is an increase in the load on the engine, the rpm of the engine goes down and there is a reduction of the speed of rotation of the governor weights (2). The force of rotation (centrifugal force) of the governor weights (2) is less and the spring (13) pushes seat (12) and pilot valve plunger (11) to a position in bushing (9) where an oil passage is opened and oil is sent to the power piston (6). The pressure of the oil moves the power piston which moves the lever (5). The lever is part of the governor terminal shaft which is connected to the fuel rack or carburetor throttle. The rack or throttle is moved to a more fuel position and there is an increase in engine rpm. As the engine rpm goes up, the governor weights turn faster. The force of rotation (centrifugal force) is larger and the toes of the weights move the thrust bearing and spring seat (12) and pilot valve plunger (11). When the rpm of the engine is again the same as it was before there was an increase in the load, the governor weights have moved the pilot valve plunger to its original position. This closes the oil passage to the power piston (6) to stop the movement of the power piston and linkage to the rack or throttle.When there is a