Compared to using bearings to support the crankshaft, the selection of bearings has the following advantages:

Cost effective: The use of bushing is more economical than bearing. Bearing bushing is made of less expensive alloy materials, while bearings require more complex design and manufacturing processes, using more expensive materials. In large-scale production, the selection of bearing can reduce production costs and improve the overall economic benefits.
Wear resistance: Bearing bushing is usually made of materials such as copper and aluminum alloy, which have excellent wear resistance. When the crankshaft rotates at high speed, it is affected by friction and pressure, and the excellent anti-wear performance of the bearing shell can effectively reduce wear and damage and extend the service life of the crankshaft.
Heat conduction performance: the engine will produce a lot of heat when working, and the bearing shell has good heat conduction performance, which can quickly distribute the heat on the crankshaft to the crankcase and cooling system. This helps keep the crankshaft at a suitable operating temperature, reducing heat buildup and damage caused by overheating.
Self-lubricating performance: The bearing shell is usually provided with an oil groove and an oil hole for supplying lubricating oil to the friction surface. This self-lubricating design creates a lubricating film that reduces friction and wear while providing cooling. In contrast, bearings require additional lubrication systems and equipment to provide lubricating oil, adding complexity and cost.
Easy maintenance: the bearing is easier to inspect, replace and maintain than the bearing. When the crankshaft wears out or has problems, only the bearing bush needs to be replaced, rather than the entire bearing needs to be replaced. This saves time and costs and reduces downtime during repairs.