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If a sleeve bearing needs replacement, which type of bearing would be incorrect to use?

  1. Friction bearing AKA Sleeve bearing

  2. Roller bearing

  3. Ball bearing

  4. Magnetic bearing

The correct answer is: Roller bearing

A sleeve bearing, also known as a friction bearing, is designed to facilitate smooth rotation by allowing surfaces to slide against each other with a minimal coefficient of friction. When considering alternatives for replacement, it's essential to maintain the functional requirements of the mechanism within the elevator system. Using a roller bearing, for example, introduces a different mechanism of operation, relying on rolling friction rather than sliding friction. This could significantly change the dynamics and performance of the equipment. Additionally, roller bearings generally require different mounting arrangements and lubrication techniques, which may not fit or adhere to the existing structure designed for sleeve bearings. Ball bearings operate similarly, employing rolling elements to reduce friction and can typically operate at higher speeds but come with their unique considerations, including load handling and space requirements. Magnetic bearings, on the other hand, utilize magnetic fields to levitate and stabilize components without contact, which is not compatible with the design that utilizes sleeve bearings. Thus, the correct choice highlights that a replacement with roller bearings would disrupt the intended design and functional characteristics of the bearing system in use.