STEM Learning Environment Mechanisms Assignment #4 Belt Drives Lesson #1 Pulleys and Belts Name: Period: Directions: Fill in the areas of this document as instructed by your teacher. This Presentation will explore... Different Types of Pulleys and Belts Pulley Speed and Direction Couplings and Fixings Pulley Systems and Mechanical Advantage Pulleys 1. Pulleys are used to transfer, via a belt, from one shaft to another. Driver pulley 2. The pulley is turned by a, such as an electric motor. In the picture shown to the right, turning the causes the belt to turn the. Driven pulley 3. The distance between the shafts is, so there may be a great distance between them. This provides systems. 4. An example of a pulley belt drive is the of a vehicle. Flat Drive Belts 5. These were the earliest produced belts,. Modern flat belts are made from.
6. Used where a is required. Particularly suitable for applications, especially where belts must be twisted. 7. Belt tension must be set precisely or slippage will occur, causing. 8. Typical applications include, and other heavy industrial equipment. Question #1 9. Flat drive belts are particularly suitable for high speed applications, especially where belts must be twisted and a low starting torque is required. Is this TRUE or False? (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) Question #1: TRUE or FALSE (circle one) Round Drive Belts 10. are driven by rubber belts. The belt fits securely into the groove in the pulley. 11. Used where to starting torque is required. 12. This type of pulley belt drive is typically used by applications in the. For example, in. Vee Drive Belts 13. Vee shaped pulleys are driven by. The belt fits securely into the in the pulley. 14. Used where starting torque is required. The the applied torque, the the belt grips the side walls of the pulley. 15. This type of pulley belt drive is typically used by applications. For example, in.
Question #2 16. Which is NOT a typical application for a vee belt? (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) Question #2: A) Cassette player B) Drilling machine C) Milling machine D) Alternator drive belt Toothed Drive Belts 17. consist of toothed pulleys on shafts and a toothed belt. 18. Pulley belts have teeth. They are typically made from a, and are sometimes by the use of cords. 19. They are used in applications where must not occur. Pulley belts have a life and must be replaced as specified. 20. A typical use of a timing pulley drive is the, as shown to the right. Question #3 21. Why is a toothed drive belt used to drive a camshaft? (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) Question #3: Chain Drives 22. A consist of gears (toothed wheels) on and a, which fits over the sprockets. 23. Typically used in applications where is required and.
24. Chain drives are than timing belts. Normally, they have to be replaced at specified intervals. 25. A typical use is the drive between the on a bicycle. Question #4 26. Normally, chain drives have to be replaced at specified intervals. Is this TRUE or False? (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) Question #4: TRUE or FALSE (circle one) Drive Belt / Chain Tension 27. It is important that a is correctly to prevent slippage and power loss. 28. Where the drive belt is a, serious mechanical damage may occur if the belt. 29. A (idler pulley) can be used to keep the belt firmly against the pulleys. Driver pulley 30. The position of the tensioner is. It pushes inward, on the (smooth, longest side) of the belt. 31. The allows the belt to be easily. Pulley Speed (Draw Diagrams to the right of each statement) 32. When the driver and driven pulleys are the same size, both pulleys rotate at the same speed. 33. When the driven pulley is larger than the driver pulley, the driven pulley rotates slower than the driver pulley.
34. When the driven pulley is smaller that the driver pulley, the driven pulley rotates faster than the driver pulley. Question #5 35. When the driven pulley is larger than the driver pulley, the driven pulley rotates: (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) Question #5: Vee Belt Application 36. Stepped ( ) pulleys are made from a number of pulleys in and constructed as a single unit. 37. With stepped pulleys fixed on shafts as shown in the top diagram, a belt connecting the two can be moved to various combinations of driver and driven gear, in order to produce different drive speeds. 38. Stepped pulleys typically use and. An example of their use is in bench drilling machines. Question #6 39. Which statement is correct? (Use the SRS to complete this question then enter your answer on the line below as stated in the presentation.) CIRCLE ONE A) A vee belt grips a pulley at the bottom of its groove. B) Vee belts are used where low starting torque is required. C) A vee belt grips the side walls of a pulley. D) Vee belts can be used as timing belts on automotive engines.