Which component of a shaft coupling is responsible for directly transmitting rotational power from the driving shaft to the driven shaft_________?
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Answer: B. hub
Explanation
The key fits into keyways on both the driving and driven components within the hub to directly transmit torque and rotational power. This mechanical fastener locks the shaft and hub together, preventing relative rotation during high-torque transmission. Shear stresses developed across the cross-section of the key facilitate the direct transfer of rotational energy. Shaft couplings connect rotating drivers to driven machinery like pumps, compressors, and electrical generators. The hub is the central cylindrical portion of the coupling that slides directly onto and grips the rotating shaft. Keys are standardized machine elements designed to fail in shear before expensive shafts or gears experience damage.
A gap between coupling halves provides clearance rather than transmitting rotational power between driving and driven shafts. While hubs house the connection area, the key is the specific component that physically transmits the rotational torque. The driver refers to the motor or engine supplying power rather than the internal mechanical coupling component.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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