What type of kinematic linkage is a universal joint_____________________?
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Answer: B. lower pair
Explanation
A universal joint connects two intersecting shafts using pin and bearing connections. These pin connections provide area contact between the pins and their corresponding bearings. Kinematic pairs featuring surface contact are formally classified as lower pairs. Universal joints allow the transmission of rotational motion between misaligned shafts. The design relies on rigid yokes connected by a central cross-shaped member. Lower pairs provide lower contact stresses compared to point or line contact higher pairs.
Automotive propeller shafts use universal joints to transmit power to the rear axle. Industrial drive lines use these joints to accommodate angular misalignment between machinery. Proper lubrication of the bearing surfaces is crucial to prevent premature joint wear. Higher pairs involve point or line contact, unlike the surface contact in pin joints. Rolling pairs involve pure rolling motion without sliding friction at the interface. Sliding pairs involve linear relative motion, whereas universal joints transmit rotation.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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