Simple gear trains (AQA GCSE Design and Technology): Flashcards
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15 cards from this deck
Definition of a gear
Definition of a gear
A toothed wheel that connects to a shaft
What is a spur gear?
What is a spur gear?
A rotating wheel with teeth around its edge that connects with another spur gear
What is a driver gear?
What is a driver gear?
The gear that receives the original power input and starts the movement
What is a driven gear?
What is a driven gear?
The gear that receives power from the driver gear and produces output movement
Definition of a simple gear train
Definition of a simple gear train
Two spur gears connected together on parallel shafts
Direction of rotation in two connected gears
Direction of rotation in two connected gears
They rotate in opposite directions
Advantage of gears over pulley systems
Advantage of gears over pulley systems
Meshing teeth prevent slipping, can apply greater forces
Main purpose of an idler gear
Main purpose of an idler gear
To change the direction of rotation
Effect of idler gear on output speed
Effect of idler gear on output speed
It doesn't change the output speed at all
Purpose of compound gear trains
Purpose of compound gear trains
To create bigger speed changes than simple gear trains
Velocity ratio formula
Velocity ratio formula
Driven gear teeth ÷ driver gear teeth
Output speed formula
Output speed formula
Input speed ÷ velocity ratio
Rotation speed of larger gears (more teeth)
Rotation speed of larger gears (more teeth)
Rotate slower
Rotation speed of smaller gears (fewer teeth)
Rotation speed of smaller gears (fewer teeth)
Rotate faster
Effect when small gear drives large gear
Effect when small gear drives large gear
Slower output speed but higher force (torque)