Piston

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Automotive piston design

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  • Correct Answer = C
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  • Piston

    1. 1. OPENING TASK: <ul><li>Take out notebook and pen or pencil </li></ul><ul><li>Answer the following </li></ul><ul><li>Describe the main advantages of a in-line five cylinder engine. </li></ul><ul><li>Explain which engine would take up less space in a engine compartment, in-line 5 or a V6. </li></ul>
    2. 2. Aim: what are parts of a piston?
    3. 3. INSTRUCTIONAL OBJECTIVES : Students Will Be Able To (SWBAT): <ul><li>  </li></ul><ul><li>Name all parts of a piston </li></ul><ul><li>Explain cam-ground piston </li></ul><ul><li>Explain the reason there are two compression rings. </li></ul>
    4. 4. Aluminum piston for light weight and strength. Piston Construction Skirt - below pin hole. Connecting rod to crankshaft. Rapid changes of speed and direction. Pin connects piston to connecting rod. Next > Compression height Skirt Cylinder Connecting rod Pin hole
    5. 5. 1 A) The side B) The compression height C) The skirt D) The connecting Rod What is the part of the piston below the pin called? Question
    6. 6. Top of piston is hottest. Piston Shape Piston tapers to top. Cam-ground piston, oval for expansion. Expands across minor diameter. Next > 300-350ºF 300-450ºF 600-700ºF Minor diameter
    7. 7. 2 The top of a piston will be slightly oval in shape when cold. Is this true or false? Answer T rue or F alse. Question
    8. 8. Piston Rings Compression rings prevent pressure leakage. Two compression rings. One oil ring. Ring gap to allow expansion. Expand when hot. Next > Angle joint Step joint Butt joint
    9. 9. Oil Ring Wipes oil off cylinder wall. Holes in piston under oil ring. Returns oil to crankcase. Piston pin hole below oil ring. Next >
    10. 10. Connecting Rod Construction Connecting rod has a small end and a big end. Big end has bearing inserts. Small end may have a bushing for the piston pin. There may be an oil hole in the small end. Each rod and cap must be numbered for identification. Next >
    11. 11. Piston Assembly Next > <ul><ul><ul><li>Oil ring </li></ul></ul></ul><ul><ul><ul><li>Piston </li></ul></ul></ul><ul><ul><ul><li>Connecting rod </li></ul></ul></ul><ul><ul><ul><li>Bushing </li></ul></ul></ul><ul><ul><ul><li>Compression rings </li></ul></ul></ul><ul><ul><ul><li>Snap ring </li></ul></ul></ul><ul><ul><ul><li>Piston pin </li></ul></ul></ul><ul><ul><ul><li>Bearing shells </li></ul></ul></ul><ul><ul><ul><li>Cap </li></ul></ul></ul>
    12. 12. 4 A) Bushing B) Snap ring C) Connecting rod D) Piston ring What connects the piston to the crankshaft? Question
    13. 13. summary <ul><li>What are the Main parts of the piston? </li></ul><ul><li>Why is the top of the piston slightly oval when cold? </li></ul><ul><li>How is the piston connected to the crankshaft? </li></ul>
    14. 15. 6 A) Oil B) Water C) Piston pins D) Counterweights Which of the following are added to reduce vibration in a crankshaft? Question
    15. 16. 7 A) Crankpin B) Counterpin C) Oil pressure D) Counterweight What is another name for the journal of a crankshaft? Question
    16. 17. Oil Holes and Grooves The crankshaft rotates in the bearing shells between the cylinder block and the caps. Grooves and holes are included to allow oil circulation. Next > Cylinder block Bearing cap
    17. 18. 8 A) To allow air to circulate B) To allow for expansion C) To help relieve stress D) To allow oil to circulate Bearings have holes and grooves in them. Why is this? Question
    18. 20. Thrust Bearings and Washers Prevents lateral movement of the crankshaft. May be thrust flanges on main bearings, or separate washers. Main bearing and connecting rod (big end) bearing shown. Next > Bearing cap Crankshaft Bearing Thrust washer Main bearing
    19. 21. Seal keeps the oil in, and dust and dirt out. Oil Seals Recess in cap locates neoprene seals. Next > Main bearing seal Oil groove Oil seal recess Body Inner seal lip Spring Outer seal lip
    20. 22. 9 Main bearing oil seals are usually made of silicone. Is this true or false? Answer T rue or F alse. Question
    21. 23. Shafts are chain or belt driven from crankshaft. Balancer Shafts Reduce vibration forces and therefore engine noise. Oil pressure is fed to bearings. Next > Guide Drive chain Balancer shafts Bearing housing
    22. 24. 10 A) To prevent the engine from running too fast B) To keep the piston moving when the engine cuts out C) To enable better starting and stopping D) To reduce vibration and noise What is the purpose of Balancer Shafts? Question
    23. 25. Summary <ul><li>Pistons and Pins </li></ul><ul><li>Crankshafts and Bearings </li></ul><ul><li>Oil Seals and Balance Shafts </li></ul>You should now be aware of: End > <ul><li>Connecting Rods </li></ul>

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