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Spur Gear : Machine Design
In
Introduction :
Slipping of a belt or rope is the transmission of motion or power between two shafts. The effect of slipping is to reduce the velocity ratio of system . The motion and power transmitted by gears is equivalent to transmitted by functional wheel or disc .
Advantages of Gear Drive :.
- Transmits exact velocity ratio
- Transmit large power
- Used for small centre distance if shafts
- High Efficiency
- Reliability Service
- Compact Layout
Disadvantages of Gear Drive :.
- Require special tools and equipment
- Require lubricant and proper operation
- Vibration and noise during operation
Classification of Gears :
1. According to position of axes of shifts :.
- Parallel - Spur Gear , Single Helical Gear , Double Helical , Rack and Pinion
- Intersecting or Non - Parallel - Bevel Gear
- Non - Intersecting and Non - Parallel - Worm and Wormed Gear , Spiral Gear
Double Helical Gear |
Bevel Gear |
Worm Gear |
2. According to the peripheral velocity of gear :.
- Low velocity - less than 3m/s
- Medium velocity - (3 - 15) m/s
- High velocity - more than 15 m/s
3. According to the type of gearing :.
- External Gearing
- Internal Gearing
- Rack and Pinion
External Gearing |
External Gearing - Two shafts mesh externally, larger wheel - Spur Gear or Gear , Smaller wheel - Pinion.
Internal Gearing : Two shafts mesh internally , larger wheel - Annular Wheel , Smaller Wheel - Pinion .
Rack and Pinion : Externally and internally ,straight line gear is called rack and circular wheel is called pinion .
4. According to position of teeth on gear surface :.
- Straight - Spur Gear.
- Inclined - Helical Gear
- Curved - Spiral Gear.
Terms Used in Gears :
1. Pitch Circle 2. Pitch Circle Diameter 3. Pitch Point 4. Pitch Surface 5. Pressure angle or angle of obliquity 6. Addendum 7. Dedendum 8. Addendum Circle 9. Dedendum Circle 10. Circular Pitch 11. Diametral Pitch 12. Module 13. Clearance 14. Total Depth 15. Working Depth 16. Tooth Thickness 17. Tooth Space 18.Backlash 19. Face of Tooth 20. Top Land 21. Flank of Tooth 22. Face wide 23. Profile 2224. Fillet Radius 25. Path of Contact 26. Length of path of Contact 27. Arc of Contact (a) Arc of Approach AOA (b) Arc of Recess AOR
Terminology of Spur Gear Comming soon..... |
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