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Which one of the following types of bearings is employed in shafts of gearboxes of automobiles?
- a)Hydrodynamic journal bearings
- b)Multi-lobed journal bearings
- c)Antifriction bearings
- d)Hybrid journal bearings
Correct answer is option 'C'. Can you explain this answer?
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Which one of the following types of bearings is employed in shafts of ...
Antifriction bearings are employed in the shafts of gearboxes of automobiles.
Explanation:
Gearboxes in automobiles are responsible for transmitting power from the engine to the wheels at different speeds. The gearbox consists of multiple gears and shafts that need to rotate smoothly and efficiently. Bearings are used to support and reduce friction between the rotating shafts and the gearbox housing.
Types of bearings:
1. Hydrodynamic journal bearings:
- These bearings rely on a thin film of lubricant to separate the shaft from the bearing surface.
- They work by creating a hydrodynamic wedge of lubricant that supports the load and reduces friction.
- Hydrodynamic journal bearings are commonly used in large rotating machinery such as turbines and generators, but they are not typically employed in the shafts of gearboxes in automobiles.
2. Multi-lobed journal bearings:
- Multi-lobed journal bearings have lobes or lobed bearing surfaces.
- They are designed to provide high load-carrying capacity and stability under heavy loads.
- However, these bearings are not commonly used in the shafts of gearboxes in automobiles.
3. Antifriction bearings:
- Antifriction bearings are commonly used in the shafts of gearboxes in automobiles.
- These bearings are designed to minimize friction between the rotating shaft and the bearing surface.
- They are typically made of rolling elements such as balls or rollers that roll between the inner and outer races of the bearing.
- Antifriction bearings provide smooth operation, high durability, and low friction, making them ideal for use in gearboxes where efficiency and performance are crucial.
4. Hybrid journal bearings:
- Hybrid journal bearings combine the advantages of hydrodynamic and rolling element bearings.
- They use a combination of fluid film lubrication and rolling elements to support the load.
- While hybrid journal bearings have their advantages, they are not commonly used in the shafts of gearboxes in automobiles.
Therefore, the correct answer is option C: Antifriction bearings.
Explanation:
Gearboxes in automobiles are responsible for transmitting power from the engine to the wheels at different speeds. The gearbox consists of multiple gears and shafts that need to rotate smoothly and efficiently. Bearings are used to support and reduce friction between the rotating shafts and the gearbox housing.
Types of bearings:
1. Hydrodynamic journal bearings:
- These bearings rely on a thin film of lubricant to separate the shaft from the bearing surface.
- They work by creating a hydrodynamic wedge of lubricant that supports the load and reduces friction.
- Hydrodynamic journal bearings are commonly used in large rotating machinery such as turbines and generators, but they are not typically employed in the shafts of gearboxes in automobiles.
2. Multi-lobed journal bearings:
- Multi-lobed journal bearings have lobes or lobed bearing surfaces.
- They are designed to provide high load-carrying capacity and stability under heavy loads.
- However, these bearings are not commonly used in the shafts of gearboxes in automobiles.
3. Antifriction bearings:
- Antifriction bearings are commonly used in the shafts of gearboxes in automobiles.
- These bearings are designed to minimize friction between the rotating shaft and the bearing surface.
- They are typically made of rolling elements such as balls or rollers that roll between the inner and outer races of the bearing.
- Antifriction bearings provide smooth operation, high durability, and low friction, making them ideal for use in gearboxes where efficiency and performance are crucial.
4. Hybrid journal bearings:
- Hybrid journal bearings combine the advantages of hydrodynamic and rolling element bearings.
- They use a combination of fluid film lubrication and rolling elements to support the load.
- While hybrid journal bearings have their advantages, they are not commonly used in the shafts of gearboxes in automobiles.
Therefore, the correct answer is option C: Antifriction bearings.
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Which one of the following types of bearings is employed in shafts of gearboxes of automobiles? a)Hydrodynamic journal bearingsb)Multi-lobed journal bearingsc)Antifriction bearings d)Hybrid journal bearingsCorrect answer is option 'C'. Can you explain this answer?
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