Mechanisms and Power Transmission Components Analysis
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1. Types of Cams and Followers
- Cams: Disc or radial cam, cylindrical cam, conjugate cam, heart-shaped cam.
- Followers: Knife-edge follower, roller follower, flat-faced or mushroom follower, spherical-faced follower.
2. Cam Terminology
- Base Circle: The smallest circle centered on the cam axis and tangent to the cam profile.
- Prime Circle: The smallest circle that can be drawn *within* the cam profile.
- Pressure Angle: The angle between the direction of the follower motion and a normal to the cam profile.
- Lift: The movement of the follower from its lowest to highest position.
3. Comparison Between Rigid and Flexible Drives
- Rigid Drives (like gears) provide precise motion but can be noisy and require precise alignment.
- Flexible Drives (like belts and chains) can absorb shocks and vibrations, are quieter, and can work over larger distances but might have issues with slip and stretch.
4. Types of Belts
- Flat Belts: Best suited for high speed and light loads.
- V-Belts: Provide good grip and alignment and are better for medium to heavy loads.
- Timing Belts: Have teeth to prevent slip, suitable for applications requiring precise timing.
5. Chordal Action of Polygon Chain
This refers to the minor fluctuations in the speed of a driven shaft in chain drives due to the chain being a series of straight segments (like a polygon) rather than a perfect circle.
6. Classification of Brakes
- Mechanical Brakes: Drum brakes, disc brakes.
- Electrical Brakes: Magnetic brakes, regenerative brakes.
- Hydraulic Brakes: Used primarily in automotive and heavy equipment applications.
7. Classification of Gears
- By Shape: Spur gears, helical gears, bevel gears, worm gears.
- By Configuration: External gears, internal gears, rack and pinion.
8. Methods to Avoid Interference in Gear Transmission
- Profile Modification: Altering the standard tooth shape.
- Increasing Center Distance: Slightly more than the sum of the radii.
- Using Undercutting: A process used in gear machining.