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Mechanism

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by

Tayler Urdiales

on 1 November 2013

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Transcript of Mechanism

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
Mechanism
Universal Joint
What is the angular range between the
input shaft and the output shaft in which
this mechanism will work?
the angular ranges are
> 90˚ and < 270˚
By: Tayler Urdiales
Is the speed and torque increased, decreased, or
constant?
The speed is constamt for both
What is the speed ratio of the input shaft
to the output shaft?
1:1
Is the flow of power reversible?
yes
Do the input and output shafts turn in the same direction?
yes
Example;
drive shaft of vehicles
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?
3.2:1
5. Is the flow of power reversible?
reversible
6. Is the direction of travel reversible?
reversable
7. List an example- Watches
Crown and pinion
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
Pulley and Belt
1. What is the relationship of the input shaft
compared to the output shaft?
parralel
2. Is the speed increased, decreased, or
constant?
increased
3. Is the torque increased, decreased, or
constant?
decreased
4. What is the input to output ratio?
1:2.5
5. Is the flow of power reversible?
reversible
6. Does the input shaft turn in the same
direction as the output shaft?
wheel turns into same direction
7. Does the input shaft turn in the same
direction as the output shaft if the belt is
crossed?
wheel in opposite direction
8. List an example- lawn mower
Cam and Follower
What is the type of input movement?
rotary
2. What is the type of output movement?
reciprocating
3. How many times does the follower move
up and down with one revolution of the
crank?
goes up and down 1 time every revolution
4. Is the flow of power reversible?
not reversible
5. Is the direction of travel reversible?
reversible
6. List an example- cam shaft
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.
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