What type of bearings are characterized by being quieter and less costly if properly lubricated?

Plain bearings are characterized by their design, which involves surfaces sliding against each other without the use of rolling elements like balls or rollers. When properly lubricated, they can operate more quietly than other types of bearings, making them suitable for applications where noise reduction is important.

Additionally, plain bearings are typically less costly to manufacture and maintain, especially in situations that do not require high-speed operation or where loads are more evenly distributed. Their simpler design means fewer parts, which can contribute to lower production costs. Proper lubrication is essential for their performance, as this reduces friction and wear, thus enhancing their durability and operational efficiency. These characteristics make plain bearings particularly appealing in various mechanical applications where cost and noise are critical factors.