Mechanical drives Flashcards
Functions of mechanical drives
power components where the engine cannot be located within close proximity of the driven component
increasing torque or speed as required
Types of mechanical drives
shaft gear pneumatic hydraulic belt chain
Usefulness of gears
provide accurate timing of component
different gear ratios can be used
Types of gears
Spur
Helical
Double helical
Uses and advantages of spur gears
cheap
easy and quick manufacturing
low speed applications due to the nature of the teeth
at high speeds, noise and vibrations
Uses and advantages of helical gears
cheap
easy and quick manufacturing
quiet in operation
good in continual rotation
(axial thrust must be controlled)
Disadvantages and advantages of double helical gears
more expensive
cancels out axial thrust
large torque
Considerations when using gears
an increase in gears = an increase in different ratios
shafts must be in parallel
proximity must be close between the driving and driven components
Considerations when using hydraulics
no proximity required between the components
no alignment required
Advantages and disadvantages of hydraulics
produce large forces
more expensive than pneumatics
Advantages and disadvantages of pneumatics
cheaper than hydraulics
lower force
less torque
higher maintenance
