Gears (Leaving Cert Engineering): Flashcards
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Practise the cards
13 cards from this deck
Definition of gears
Definition of gears
Rotating mechanical components w/ teeth that mesh to transmit power & motion
Primary purpose of gears
Primary purpose of gears
Gear reduction in motorised equipment
What gears trade for increased torque
What gears trade for increased torque
Speed
Speed-torque trade-off in gears
Speed-torque trade-off in gears
Speed decreases, torque increases proportionally
Most common gear application
Most common gear application
Speed reduction and torque increase
Can gears change rotation direction?
Can gears change rotation direction?
Yes, by 90° or other angles
Gear ratio definition
Gear ratio definition
Mathematical relationship between no. of teeth on meshing gears/sprockets
Effect of larger gear on speed & torque
Effect of larger gear on speed & torque
Slower rotation but greater torque
Effect of smaller gear on speed & torque
Effect of smaller gear on speed & torque
Faster rotation but less torque
What are spur gears?
What are spur gears?
Most basic gear type with straight teeth
Spur gear teeth orientation
Spur gear teeth orientation
Straight, parallel to axis of rotation
Mounting requirement for spur gears
Mounting requirement for spur gears
Must be on parallel shafts
Electric screwdriver gear function
Electric screwdriver gear function
Convert high speed/low torque to low speed/high torque