1. Mechanisms!
Created by Educational Technology Network

2. Spur Gears
Complex Mechanisms
Gear Ratio
Types of movement
Concepts 10 20 30 40 50

3. Question
What type of mechanism is this?

4. Answer 1 – 10
Simple Gear Train

5. Question
What are the two names for the gear on the left?

6. The drive gear or the input
Answer 1 – 20
The drive gear or the input

7. Question
Which gear train increases speed?
A B

8. Answer 1 – 30
Mechanism B increases speed

9. Question
What is the name and purpose of the middle gear?

10. Answer 1 – 40 Middle gear = idle gear or idler
Purpose of idler: to change the direction of the gears so the input and output go the same direction

11. Question
What is the purpose of the gear train shown below?

12. Answer 1 – 50
That simple gear train would increase torque.

13. Question
What type of mechanism is shown below?

14. Answer 2 – 10
The Worm and Wheel

15. Question
What type of mechanism is shown below?

16. Answer 2 – 20
Chain Drive

17. Question
What type of mechanism
is shown below?

18. Answer 2 – 30
Cam and follower

19. Question
Which two mechanisms cause a tremendous decrease in speed but a huge advantage to torque?

20. Answer 2 – 40
The worm and wheel and lead screw.

21. Question
Name the following mechanisms and explain what they have in common.

22. Answer 2 – 50 Crank and slider Cam and follower Both have rotary input
and reciprocating output, both use a cam gear

23. Question
What is the gear ratio of the following gear train?

24. Answer 3 – 10
60:60 = 1:1

25. Question
What is the gear ratio of the following mechanism? (60 teeth and 36 teeth)

26. Answer 3 – 20
36:60 = 3:5

27. Question
If a simple gear train has an input gear with 100 teeth and an output gear with 50 teeth, what will happen to the speed?

28. Answer 3 – 30
The speed will double
(Torque will decrease by half)

29. Question
What is the gear ratio of the following mechanism’s input and output gears?

30. Answer 3 – 40
60:60 = 1:1

31. Question
What happens to torque and speed on the idler gear?

32. Answer 3 – 50
Torque decreases and speed increases on the idler gear

33. Question
What type of movement is shown below?

34. Answer 4 – 10
Rotary

35. Question
What is the input movement of the mechanism shown below?

36. Answer 4 – 20
Rotary

37. Question
What is the output movement of the mechanism shown below?

38. Answer 4 – 30
Linear output movement

39. Question
What type of input and output movement does the following mechanism have?

40. Answer 4 – 40
rotary

41. Question
What type of mechanisms transfer rotational input to linear output?

42. Answer 4 – 50
Rack and pinion
Lead screw

43. Question
What is a force?

44. Answer 5 – 10
A force is a push or pull in a straight line.

45. Question
What is torque?

46. Answer 5 – 20
Torque is a push or pull in a circular motion

47. Question
What type of mechanism would be similar to an oil pump?

48. Answer 5 – 30
The cam and follower

49. Question 5 - 40 What type of mechanism is similar to this
vice grip and a car jack?

50. Answer 5 – 40
The lead screw

51. Question
If you were pedaling a bike up a hill, which gear would you want the pedals on?

52. Answer 5 – 50
The smaller gear…it provides more torque to push you up a hill with less input work.