(1) General.
- The bleed valve fuel gear motor assembly consists of a positive displacement gear motor and end-of-stroke stop mechanism. The motor converts pressurized fuel into rotary shaft power driving the gear reduction stage of the bleed valve and master ballscrew actuator assembly through the bleed valve stop mechanism. The bleed valve fuel gear motor is located on the fan frame aft face at the 9:00 o'clock position.
(2) Description.
- The motor controls the position of the bleed valves. It is a gear motor driven by high pressure fuel. It consists of 2 spur gears guided during rotation by needle bearings. Sealing at the drive gear shaft is provided by carbon seals. A secondary lip seal is installed on the output shaft for further sealing. A drain system collects fuel leaks which could occur past the different sealing provisions.
D. Bleed Valve Stop Mechanism Assembly (Ref. Fig. 007) The function of the bleed valve stop mechanism assembly is to limit the number of revolutions of the bleed valve fuel gear motor to the number of
R revolutions required for a complete cycle (opening-closing) of the VBV
R doors. It is located between the bleed valve fuel gear motor and the bleed valve and ballscrew actuator on the aft face of the fan frame at the 9 o'clock position aft looking forward.
R NOTE : The bleed valve stop mechanism includes a protecting dust cover
____ R boot to protect the shaft and ball bearing (PRE CFM56-5B SB R 75-0010); the bleed valve mechanism which includes packed sealed R bearings has not a protecting dust cover boot (POST CFM56-5B SB R 75-0010).
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R Main Flexible Shaft and the 11 Flexible Shaft Assemblies Figure 004
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Bleed Valve Fuel Gear Motor Location
Figure 005
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Assembly of the Bleed Valve and Fuel Gear Motor
Figure 006
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R Bleed Valve Stop Mechanism Location Figure 007
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E. Bleed Valve and Master Ballscrew Actuator Assembly (Ref. Fig. 008) The bleed valve and master ballscrew actuator is the unit which transfers the driving input from the bleed valve fuel gear motor to the 11 ballscrew actuators system. It consists of a speed reduction gearbox and a ballscrew actuator linked to a hinged door. The master ballscrew actuator is located on the fan frame under fan duct panel at the 9:00 o'clock position, aft looking forward.
F. Bleed Valve and Ballscrew Actuator Assembly
(Ref. Fig. 009)
(1) General Eleven bleed valve and ballscrew actuator units are attached to the fan frame. They are controlled by the ECU and open at low and transient power settings to increase the booster mass flow and improve booster and HP compressor matching. Each bleed valve and master ballscrew actuator consists of a bevel gear speed reduction gearbox and a ballscrew unit linked to a hinged door.
G. Transducer Variable Bleed Valve (VBV) Position Feedback (Ref. Fig. 010) The VBV position sensor is of the Rotary Variable Differential Transducer (RVDT) type. It is installed on the VBV stop mechanism. It sends an angular position to the ECU.
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Bleed Valve and Master Ballscrew Actuator
Figure 008
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Bleed Valve and Ballscrew Actuator (Typical)
Figure 009
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VBV Position Sensor
Figure 010
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VARIABLE BLEED VALVE SYSTEM (VBV) - ADJUSTMENT/TEST
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