What are the supporting methods of the crankshaft

The supporting methods of the crankshaft include sliding bearing and rolling bearing.

Sliding bearing: The crankshaft and bearing surface are in sliding contact and lubricated with a lubricating oil film. The advantages of sliding bearings are simple structure, low manufacturing cost, but large friction losses and easy to generate heat. Therefore, they are suitable for low and medium speed engines.

Rolling bearing: The crankshaft and the bearing surface are in rolling contact with balls or rollers, and lubricated with a lubricating oil film. With low friction loss, it is suitable for high-speed engines. The disadvantages of rolling bearings are complex structures and high manufacturing costs.

Overall, sliding bearings are suitable for low and medium speed engines, while rolling bearings are suitable for high speed engines.

The supporting methods of the engine crankshaft are generally divided into the following types:

Sliding bearing support: The engine crankshaft is usually supported by sliding bearings, which support the movement of the crankshaft through a film of lubricating oil. Sliding bearings have the advantages of wear resistance and large bearing capacity, but they are prone to problems such as poor lubrication and wear under high-speed, high-temperature, and high load conditions.

Rolling bearing support: The engine crankshaft can also be supported by rolling bearings, which support the movement of the crankshaft through rolling elements such as balls and rollers. Rolling bearings have the advantages of large bearing capacity and long service life, but their manufacturing costs are high and their noise is high.

Hydrostatic bearing: Hydrostatic bearing is a high-precision, high-speed crankshaft bearing method that supports the movement of the crankshaft by forming pressure inside the bearing with high-pressure liquid. Hydrostatic bearings have the advantages of large bearing capacity, long service life, and low friction, but their manufacturing and maintenance costs are high.

Magnetic suspension bearing: Magnetic suspension bearing is a high-tech crankshaft bearing method that supports the movement of the crankshaft through electromagnetic force. It has the advantages of non-contact, friction-free, and smooth operation, but its manufacturing and maintenance costs are extremely high, and its current application is relatively limited.