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2.2.2.A Mechanical Gears

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by

Midori Tobin

on 30 November 2015

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Transcript of 2.2.2.A Mechanical Gears

Bevel Gear
1. What is the angle of the input shaft compared to the output shaft?
90˚ Angle
2. Is the speed increased, decreased, or constant?
constant
3. Is the torque increased, decreased, or
constant?
constant
4. What is the gear ratio?
1:1
5. Is the flow of power reversible?
reversible
example: hand drill
Simple Gear Train with Idler
1. What is the relationship of the input shaft
compared to the output shaft?
parallel
2. Is the speed increased, decreased, or
constant?
decreased
3. Is the torque increased, decreased, or
constant?
increased
4. What is the gear ratio?
4:1
5. Is the flow of power reversible?
reversible
6. Compare the direction of travel between
the input and output gears.
same direction
7. Predict what the direction of travel would be between the input and output gears
if the idler gear is eliminated from the mechanism.
different direction
Example- paper transport rollers
Worm and Wheel
1. What is the angle of the input shaft
compared to the output shaft?
90 degree angle
2. Is the speed increased, decreased, or
constant?
decreased
3. Is the torque increased, decreased, or
constant?
increased
4. What is the gear ratio?
20:1
5. Is the flow of power reversible?
not reversible
6. Is the direction of travel reversible?
reversible
7. List an example- winch
Mechanisms
By: Midori Tobin and Tyler Randall
Rack and pinion
1. What is the type of input movement?
rotary
2. What is the type of output movement?
What distance does the rack move with
one revolution of the crank?
linear. the rack will move a longer distance
3. If the diameter of the pinion gear were
increased, would the rack move a shorter
or longer distance?
2 inches
4. Is the flow of power reversible?
reversible
5. Is the direction of travel reversible?
reversible
6. List an example-ice cream scooper
Lead Screw
1. What is the type of input movement?
rotary
2. What is the type of output movement?
linear
3. How many revolutions of the crank are
needed to move the screw block 1 inch?
6 revolution= 1 inch
4. Is the flow of power reversible?
not reversible
5. Which is increased in the output? Force
or speed?
Force is increased
6. Is the direction of travel reversible?
yes
7. List an example- jack
Crank and Slider
1. The input to this system is what type of
motion?
rotary
2. The output of this system is what type of
motion?
reciprocating
3. How far does the slider move with each
revolution of the crank?
1 inch= diameter of crank
4. If the diameter of the crank gear were
increased, would the slider move a
shorter or longer distance?
increased by distance slider moves
5. Is the flow of power reversible?
not reversible
6. List an example-steam train
Conclusion questions
1. Which mechanisms increase speed?
Universal joint, bevel gear, and pulley and belt.
2. Which mechanisms increase torque?
universal joint, bevel gear, simple gear train with idler, worm and wheel, and crown and pinion.
3. Which mechanisms allow the reversal of power?
universal joint, bevel gear, simple gear train with idler, crown and pinion,rack and pinion, and a pulley and belt.

Simple Gear Train
. What is the relationship of the input shaft compared to the output shaft?
parallel
2. Is the speed increased, decreased, or constant?
decreased
3. Is the torque increased, decreased, or constant?
increased
What is the gear ratio?
4:1
Is the flow of power reversible?
yes
Compare the direction of travel between the input and output gears.
same direction
Example- paper transport rollers
Is the flow of power reversible? (Can you make the input shaft turn by turning the output shaft?)
yes
Do the gears move in the same or in the opposite direction?
opposite.
Simple Gear Train
Differential Gear (Optional)
What types of gears are used to make the differential?
Their is a bevel gear and a regular gear
Do the axles turn in the opposite or in the same direction?
same direction
List an example where this mechanism might be used. For help, go to www.howstuffworks.com and use keyword differential.
can be found in a car's rear axle
What is the purpose of a differential?
so if something goes wrong i can still be used and the power can be transferred if something does happen
Full transcript