Hydraulics Flashcards
Definition of a fluid?
Substance that will readily take shape of its container.
Capable of transmitting power.
Can be liquid or gas.
Advantages of hydraulics?
Reliable Simple and easy to understand Infinite speed range Easily reversed Withstand overload No spark risks High torque at low speeds 1/12 size of electric motor equivalent
Disadvantages of hydraulics
Fire risk with mineral oil systems
Noise
Risk of contamination
Less efficient 85-95%
PPE for working on fluorocarbon?
PVC Gauntlets
Rubber Boots
PVC Coveralls
Full-face visor
Two types of hydraulic fluid?
Petroleum based
Synthetic based
Types of oil?
OX30 - red in colour
OM33 - yellow/ orange in colour
OX40 - green in colour
Requirements of a hydraulic fluid?
Main is for the transfer of power Fluid must flow easy through lines Must be incompressible Lubrication is important too Sealing properties Cooling is another
Contamination in hydraulic oil are?
Airborne particles and moisture Construction dirt Dirt in new fluid Dirt produced by wearing in new system. Dirt from human sources
How to reduce contamination in hydraulic oil?
Good system design Filtration and filter maintenance Opp of filter and clogging indicators Good working practices Guardian filter pack Caps fitted to open pipework Clean working area
Hydraulic pumps?
Internal gear wheel type External gear wheel type Vane type Lobe type Radial piston type Axial piston pump - use swash plate
What are Axial piston pumps used on?
Stabiliser systems
CPP systems
Steering systems
What does a actuator do?
Convert hydraulic energy into mechanical motion.
Two types - linear and rotary
Linear actuators either single or double acting.
Purpose of an accumulator?
Store energy and smooth out pulsations
Used as a surge or pulsation dampener or absorber
