According to the working principle of bearing, it can be divided into rolling friction bearing (rolling bearing) and sliding friction bearing (sliding bearing).

滑動軸承:在滑動軸承表面若能形成潤滑膜將運動副表面分開，則滑動摩擦力可大大降低，由于運動副表面不直接接觸，因此也避免了磨損。滑動軸承的承載能力大，回轉精度高，潤滑膜具有抗沖擊作用，因此，在工程上獲得廣泛的應用。

Sliding bearing: if a lubricating film can be formed on the surface of the sliding bearing to separate the surface of the moving pair, the sliding friction can be greatly reduced. Since the surface of the moving pair is not in direct contact, wear is also avoided. Sliding bearing has large bearing capacity, high rotation precision and anti impact effect of lubricating film. Therefore, it has been widely used in engineering.

潤滑膜的形成是滑動軸承能正常工作的基本條件，影響潤滑膜形成的因素有潤滑方式、運動副相對運動速度、潤滑劑的物理性質和運動副表面的粗糙度等。滑動軸承的設計應根據軸承的工作條件，確定軸承的結構類型、選擇潤滑劑和潤滑方法及確定軸承的幾何參數。

The formation of lubricating film is the basic condition for the normal operation of sliding bearing. The factors affecting the formation of lubricating film include lubrication mode, relative motion speed of moving pair, physical properties of lubricant and surface roughness of moving pair. The design of sliding bearing shall determine the structural type of bearing, select lubricant and lubrication method and determine the geometric parameters of bearing according to the working conditions of bearing.

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