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Rolling bearing basic knowledge summary

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First, the main function of the rolling bearing:
Under the condition of ensuring the bearing has a satisfactory life; to support the rotating (or swaying) parts; to transfer the load; to reduce the conflict between the moving pairs; to make it rotate (or swing) sensitive.
Second, the fundamental needs of bearings:
Satisfied with the load, speed, accuracy, dynamic function (noise, oscillation), ambient temperature and service life required for the operating conditions.
Third, the basic layout of the rolling bearing:
It consists of inner ring, outer ring, rolling body and cage (commonly known as four large pieces).
The inner ring is mounted with the shaft and the outer ring and the bearing housing hole. When the inner ring or the outer ring is a rotating ferrule, the tight cooperation is used; when the inner ring or the outer ring is not rotated, the transition cooperation is selected.
The roll body (steel ball, roller or needle roller) is the central part of the roll bearing; when the inner and outer rings are relatively changed; the roll body rolls between the raceways of the inner and outer rings. The shape, size and number of the roll body directly affect the bearing. Load ability and function.
The cage can evenly distribute the roll body, guide the roll body rotation and improve the smooth internal function of the bearing.
Fourth, the information of the rolling bearing
The ferrule and roll body data have the necessary characteristics: high touch fatigue strength, high hardness, high purity, good wear resistance, good arrangement stability, and good mechanical processing function.
Common bearing information (ferrules and tumbling bodies):
　　 High carbon t-bearing steel: GCr15, GCr15SiMn and other t-containing alloy steel; heat treatment hardness is usually 60 ~ 65HRC. It is the most widely used bearing data.
Carburized bearing steel: 20CrMo, 20CrNiMo, etc.; the surface hardness after carburizing heat treatment is usually 59 ~ 64HRC; the core hardness is usually 30 ~ 45HRC. Good resistance; can accept large impact load.
The cage can be selected according to the requirements of 08 # or 10 # steel stamping cage, HPb59-1 brass solid cage, GRPA66 engineering plastic cage.
Five, the basic type of rolling bearings
Sixth, the clearance of the bearing
The radial clearance of the rolling bearing means that one ferrule is fixed; the other ferrule is perpendicular to the bearing axis; the movement from one pole orientation to the other pole orientation. The selection of the bearing clearance is correct or not. It has a great influence on mechanical working accuracy, bearing life, conflict resistance, temperature rise, oscillation and noise. If the selection of the radial bearing clearance is too small, the number of rolling bodies receiving the load will increase. The touch stress is reduced. The common 掀 掀 龋 牵 牵 牵 Σ Σ Σ 崽岣 崽岣 崽岣 崽岣 崽岣 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之 反之The most suitable clearance value; has a very important meaning.
Seven, the public service level and cooperation characteristics of the rolling bearing <br> The public service level of the rolling bearing is divided into 0 (usually); 6x; 6; 5; 4; level 2 accuracy level. Level from 0 (usual) level → level 2 Progressively. The 6x level is the public service level between 0 (normal) and 6 selected for the tapered roller bearing; usually the bearing is selected to be 0 (usual) Service level. The public service level is indicated in the bearing code by P6, P5, etc.; 0 (normal) level is not indicated in the code.
Rolling bearings are one of the most standardized and highly serialized parts in mechanical parts; suitable for mass production. Cooperation between bearings and other parts; regular bearing inner diameter and shaft cooperation use base hole to cooperate with public service; bearing outer diameter Cooperate with the bearing housing hole to use the base shaft system for public service cooperation. The elastic and tightness of the cooperation are selected based on the inner and outer diameters of the bearing.

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