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Pulleys and Belt dri

Pulleys and Belt Drives G8

pulley a wheel that has an axle mounted to frame or block, one end connected to load and one to lifting force
pulleys aka sheaves
pulley example sailboat sails
fixed pulley block is attached to solid overhead beam, makes it able to support more
fixed pulley advantages allows direction of force to be changed
mechanical advantage of fixed pulley no advantage
distance load moves equal to distance force moves
moveable pulley block attached to load, one rope end attached to force and one to fixed spot
as pulling force is applied, load moves closer to fixed point
mechanical advantage of moveable pulley formula weight/force=MA
combination pulley moveable pulley provides mechanical advantage while fixed allows change in direction
operation of combination pulley each moveable pulley adds one more rope segment
mechanical advantage for combination pulleys count number of strings supporting load
gear wheel with teeth designed to drive another gear
gear trains multiple heard used together
gear drive example speed reduction gearbox
driver gear attached to original driver
driven gear attaches to driven/output shaft, causes driven gear to turn
idler gear any gear between driver and driven gear, changed direction of rotation
mechanical advantage of gear drive with diameters diameter of driven gear/diameter of driven gear=gear ratio
mechanical advantage of gear drive with teeth number of teeth on driven gear/number of teeth of driver gear
rotations per minute change due to different wheel sizes
larger gear will be____ than small gear but will have ___ slower, more power
Created by: rudolph.beukes
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