Which is good, rolling or sliding bearings?
The role of the inner ring and shaft matched with the shaft to rotate together with the outer ring, is matched with a bearing seat, plays a supporting role, with the help of the cage rolling body is evenly distributed between the rolling ring and the outer ring, its shape and size and number directly affects the performance and life of the rolling bearing retainer the rolling body is evenly distributed, prevent rolling off, guiding the rolling body rotation lubrication.The rolling bearing is easy to use and maintain, reliable in operation and good in starting performance. It has higher bearing capacity at medium speed. The radial size of rolling bearings is larger, the vibration reduction ability is poor, the life is low at high speed, and the noise is larger.
The shaft supported by the bearing is called the journal, and the part that matches the journal is called the bush. In order to improve the friction properties of the bearing surface, the antifriction material layer, which is cast on its inner surface, is called the bearing lining. Bearing and bearing lining materials are collectively referred to as journal bearing materials. Sliding bearing applications are generally under low speed heavy load conditions, or maintenance and lubrication of the difficult parts of the operation.Generally, the rolling bearings consist of the outer ring, inner ring, roller and cage.
Rolling bearings and sliding bearings for different occasions, can not simply say good or bad.Different structures of sliding bearing is on the smooth surface to support the rotating shaft, which is a surface contact area; rolling bearing by rotation of the rolling body to support the rotating shaft, which is a point of contact area, rolling contact more, more.The motion mode of rolling bearings is rolling, the movement of sliding bearings is sliding, so the form of friction is completely different.Plain bearings work smoothly, reliably and without noise. Under the condition of liquid lubrication, the sliding surface is separated by lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorption capacity. But the starting friction resistance is larger.
