Question
Download Solution PDFWhich of the following types of the gear set is used to change rotary into linear movement and vice versa?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Rack and pinion can convert motion from rotary to linear or from linear to rotary.
- A rack and pinion gear system is composed of two gears.
- The normal round gear is the pinion gear and the straight or flat gear is the rack.
- A perfect example of this is the steering system on many cars.
Bevel Gear:
- Bevel gears are used to transmit motion between shafts at various angles to each other.
- The teeth profile may be straight or spiral.
Hypoid gears
- The hypoid gears are used in automobile differential gearboxes.
- The tooth action between each gear is a combination of rolling and sliding action along the straight line.
Spiral bevel gears
- Spiral bevel gears are used to connect two intersecting shafts.
- Spiral bevel gears have teeth inclined at an angle of the face of the bevel.
- Spiral gears have a spiral angle of 35° usually and the pressure angle varies from 14.5° to 20°.
- Spiral gears offer the following advantages
- There is a gradual contact between mating teeth therefore there is a smooth and quieter operation.
- It has more load-carrying capacity because more teeth are in contact at a time and there is a greater arc of contact.
- It permits higher operational speeds.
- The spiral bevel gears if made within one system then only they can be interchangeable otherwise they are interchanged with the sets together.
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