Transmission systems: Multiple components that have the same type of movement (rotational, linear, etc)
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2 Transmission systems: Multiple components that have the same type of movement (rotational, linear, etc) Transformation systems: Different components in the system have different types of movement Ex: rotational movement leads to linear movement
3 Components can be connected directly or through an intermediate component.
4 Reversibility: A system is considered reversible if either part can be the driver or driven Driver: initiates the motion Driven: receives the motion Remember: there can be intermediate components too
5 1) Gear Trains At least 2 gears whose teeth interlock
6 1) Gear Trains Notice that the gears move in alternate directions
7 1) Gear Trains Are they reversible? YES! You can move either gear and it will cause the others to move as well
8 1) Gear Trains Speed of the gears depends on: The number of teeth OR The diameter of the gears (friction wheels)
9 1) Gear Trains speed ratio = speed ratio = # teeth driver # teeth driven diameter driver diameter driven We ll come back to this again later!
10 If a driver gear has a diameter of 20cm and the driven gear has a diameter of 40 cm, what is the speed ratio? Which one is moving faster? diameter driver speed ratio = diameter driven speed ratio = 20cm 40cm = 1 2 = 0.5 Driver; speed ratio is <1, means a decrease in speed from driver to driven
11 2) Chain and Sprocket At least 2 gears connected by a chain Notice: all the gears turn in the same direction If it had gears on the outside; they would turn in the opposite direction
12 2) Chain and Sprocket Are they reversible? Generally yes!
13 3) Worm and worm gear Consists of a screw and at least one gear Are they reversible? No
14 4) Friction wheels (or friction gears) Like gears but without teeth Touch directly; friction causes the movement
15 4) Friction wheels (or friction gears) Are they reversible? Yes!
16 5) Belt and pulley system Like chain and sprocket but without teeth Are they reversible? Yes!
17
18 Also have driver components and driven components NO intermediates Remember: Transmission: same type of movement throughout Transformation: changing the type of movement Ex: rotational to translational
19 1) Rack and Pinion Composed of a gear (pinion) and a grooved/toothed bar (rack)
20 1) Rack and Pinion Are they reversible? Yes!
21 2) Screw gear system Composed of a screw and a nut Type 1 Screw is the driver
22 2) Screw gear system Are they reversible? No Type 2 Nut is the driver There is a helical guide The thread transforms a rotational motion into a translational motion
23 3) Cam and follower Composed of a wheel that is often oddly shaped(cam) and stick that raises and lowers (follower)
24 3) Cam and follower Are they reversible? No
25 4) Slider and crank (piston) Similar to cam and follower but the crank is usually circular and the slider is usually a block that moves within a tube
26 4) Slider and crank (piston) Are they reversible? Yes (but sometimes not well)
27 Slider and crank Rack and pinion
28
29 Cam & Follower Slider-Crank Gear Train Belt Drive / Belt & Pulleys
30 Motion Transmission Speed Ratios
31 Speed Ratio: (Components with teeth) Speed Ratio = # Driver teeth # Driven teeth = 28 7 = 4 (The small sprocket will rotate 4 times faster than the large (driver) sprocket) Driver component 28 teeth Driven component 7 teeth Intermediate component (the chain)
32 Speed Ratio: (Components with teeth) If the driver sprocket rotates 8 times clockwise, then the driven sprocket will rotate 32 times clockwise Driver component 28 teeth Speed Ratio = 4 Driven component 7 teeth
33 Speed Ratio: (Components without teeth) Speed Ratio = Driver diameter Driven diameter Driver component Pulley A 8 Pulley B 4 Intermediate component (Belt) 10 Pulley C
34 Pulley A Pulley B = 8 = 4 Speed Ratio (A B) = (Pulley B will rotate 2 times the speed of pulley A) 2 Driver component Pulley A 8 Pulley B 4 10 Pulley C
35 Pulley A Speed Ratio (A C) = 8 = 10 = (Pulley C will rotate 0.8 times the speed of pulley A) Driver component Pulley A 8 4 or Pulley C Pulley B 4 10 Pulley C
36 If pulley A rotates 40 revolutions per minute (40 rpm) 80 rpm pulley B will rotate at a speed of 32 rpm pulley C will rotate at a speed of Driver component Pulley A 8 Pulley B 4 Speed Ratio (A B) = 2 Speed Ratio (A C) = Pulley C
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