Hydraulic Pumps Flashcards
Hydraulic Power is transmitted by movement of fluid through a ______.
PUMP
The pump does not produce pressure, PRESSURE is produced by _______.
Restriction of flow
The principle of operation is the same for all pumps
LOW pressure is generated at the _____.
pump inlet
The principle of operation is the same for all pumps
HIGH pressure is created at _______ to produce flow
the outlet
Single action
Double Action
Rotary Action
Three types of HAND PUMPS
Type of hand pump that moves fluid on only 1 stroke of the piston (1 handle movement)
when pump handle is pushed, fluid is drawn in thru inlet check valve from reservoir
when handle is pulled, fluid is forced out thru the outlet check valve to the component
Single action hand pump
Type of hand pump that is most commonly used and it moves fluid on BOTH strokes of the piston (handle motion)
Piston draws fluid in from reservoir and provides output pressure to system with BOTH DIRECTIONS of HANDLE MOTION.
Double action hand pump
Type of hand pump used primarily for servicing of larger aircraft hydraulic systems
Rotary action hand pump
Kind of pump that energy energy for the pump comes
from a power source (engine, ac/dc electrical power)
provides constant hydraulic power supply to all aircraft hydraulic systems
Powered Hydraulic Pumps
2 Types of Powered Hydraulic Pumps
Constant Displacement
Variable Displacement
Type of Powered Hyd Pump that moves a specific amount of fluid each time the shaft turns (per revolution)
a regulator or relief valve is installed in the system to relieve pressure when the pump delivers more fluid than the system needs
Constant Displacement pump
Gear
Gerotor
Piston
Vane
4 types of Constant Displacement pump
Type of Constant Displacement pump for MEDIUM pressure systems
it uses spur gears, One gear is the driving gear and other one is Driven gear
Gear pump
type of constant displacement pump that has same operating principle as gear pump, (additional tooth)
Gerotor pump
type of Constant Displacement pump used for high volume, low pressure hydraulic systems.
Consists of free floating vanes in a ECCENTRICALLY mounted rotor
VANE pump
Type of Constant Displacement pump used for High pressure systems
A VALVE PLATE with 2 openings COVERS the end of the cylinders
PISTONS draw fluid in at inlet and forces fluid out at outlet
Fixed Angle Piston Pump
type of constant displacement pump that uses a fixed angle “SWASH” plateinstead of a fixed angle housing, re-placing the need for an angled housing
Fixed pitch Swash Plate
Type of PUMP that moves only the amount of fluid required by the system
pressure is controlled by VARYING the pump output negating the need for relief valves and regulators
Variable displacement pump
Engine (EDP)
Electric Motor
Air Turbine Motor
Hydraulic Motor
Ram Air Turbine (RAT)
These are the sources of Mechanical Power for the HYDRAULIC PUMP
Primary source of power in an aircraft hydraulic system
the pump is directly splined to and driven by the engine gear-box
normally always pressurizing the hydraulic system whenever the engine is operating
Engine Driven Pump (EDP)
Which hydraulic pump is most commonly
used for low pressure, high volume systems?
vane pump
________ is a narrow portion of a drive shaft designed to shear (break) in case of excessive torque loading. Can be caused by pump seizure.
This prevents further damage to either the pump or to the engine gearbox
Shear Point