Lesson 4: PUMPS Flashcards
What is the principle operation of hydraulic pumps?
Low pressure at inlet High pressure at outlet
What are the 2 types of hydraulic pumps?
Hand Powered
Why would we use hand pumps?
Small aircraft Manual Backup
The 3 types of HAND PUMPS are?
Single Double Rotary
What is the difference between SINGLE and DOUBLE action HAND PUMPS?
Double moves fluid on BOTH strokes of the piston
What is the purpose of a ROTARY action hand pump?
Maintenance for LARGE aircraft
What are the 2 types of POWERED hydraulic pumps?
CONSTANT VARIABLE
What is installed in the system to relieve pressure when the pump delivers more fluid than the system needs?
REGULATOR RELIEF VALVE
What are the types of CONSTANT displacement pumps?
GEAR GEROTOR PISTON VANE SWASH
This pump is most common on MEDIUM pressure systems and uses SPUR gears
GEAR pump
Describe a GEROTOR pump
Uses a SPUR gear and a ROTOR with additional tooth
This type of pump is used for HIGH VOLUME, LOW PRESSURE hydraulic systems
VANE PUMP
This pump is used for HIGH PRESSURE systems
FIXED ANGLE PISTON
This piston uses a SWASH plate which gets rid of the angled housing
FIXED PITCH SWASH PLATE
What is the difference between a VARIABLE and CONSTANT displacement pump?
Only moves the amount of fluid required by the system
What is the primary source of power in the aircraft hydraulic system?
EDP
What is the purpose of the CASE DRAIN?
Protect internal mechanics Cools Lubricates Relieves back pressure
This part is a narrow portion of the DRIVE SHAFT that is designed to break in case of excessive TORQUE loading which prevents damage to pump or engine gearbox
SHEAR POINT
What type of pump is this?
Double Action
What type of pump is this?
Gear Pump
What type of pump is this?
GEROTOR pump
What type of pump is this?
VANE pump
What type of pump is this?
FIXED ANGLE PISTON pump
What type of pump is this?
FIXED PITCH SWASH PLATE pump
