First, the rolling bearing of main functions:

In guarantee bearing there is sufficient life under the conditions, the metric system of deep groove ball bearing-F... Flange series to supporting rotating (or swinging) parts, transfer load, reduce the friction between the motion pair of rotating (or swinging) flexible.

Second, on the bearing the basic requirement of the:

Metric deep groove ball bearing-MR Closed to meet the conditions that series work requirements of the load, speed, accuracy, dynamic performance work (noise, vibration), the environment temperature and long service life.

Three, rolling bearing the basic structure of:

The inner ring and outer, rolling body and maintains a (known as four major pieces) composition.

Inner ring and outer shaft, the self-contained hole assembly together. When the inner ring or outer rings of rotation when used is a tight fit, not rotating the collar is with the transition.

Rolling elements (steel ball, roller or needle) is the core of the rolling bearing parts, when inside and outside the relative rotation circle, rolling, the outer body roll between way rolling. The roller shape, size and quantity direct influence of the load bearing ability and use of performance.

Metric deep groove ball bearing-MR Open type series frame can make rolling body distributing evenly and guide roller bearing rotation and improve internal lubrication performance.

Four, rolling bearing material

Rings and rolling body materials must have the characteristics of high contact fatigue strength; High hardness; Pure degree is high; Good abrasion resistance; Organization stability; Mechanical processing performance is good.

Commonly used bearing material (rings and roller) :

High carbon chromium bearing steel: GCr15, GCr15SiMn with chromium alloy steel, heat treatment, hardness is commonly HRC 60 ~ 65. Now is the most widely used bearing material.

Carburizing bearing steel: 20 CrMo, 20 CrNiMo, carburizing after heat treatment surface hardness general for 59-64 HRC, hardness of heart general is 30 ~ 45 HRC. Good toughness, able to withstand the big impact load.

According to the requirement can be used to keep frame # # 10 08 or stamping steel maintains a unidirectional, thrust ball bearing Series HPb59-1 brass entity maintains a GRPA66, engineering plastic keep frame etc.

Five, bearing clearance

The rolling bearing radial clearance refers to a fixed collar, and the other a contractor in vertical axis in bearing, by an extreme position to the other extreme position of moving. Bearing clearance choice is correct or not, the mechanical operation precision, bearing life, friction resistance, normal temperature, vibration and noise etc all has very big effect. As to the heart bearing clearance of the selected hour, can make up the load of the increased number of roller, reduce the contact stress, running a smooth, however, will increase friction resistance, temperature rise would increase. Conversely, the contact stress increases, vibration, and reduce the friction resistance, low temperature. Accordingly, according to bearing conditions of use, miniature thrust ball bearing-F-M series to select the most appropriate clearance value, has the extremely vital significance.

Six, rolling bearing tolerance level and cooperate with characteristics

The tolerance of rolling bearings are rated 0 (ordinary), 6 x, 6,5,4,2 precision grade level. Level from 0 (ordinary) class-2 levels increase in turn. 6 x is for tapered roller bearing the between 0 (normal) level and level 6 between tolerance grade, usually bearing the is 0 (ordinary) level of tolerance level. Tolerance grade at the P5, etc, to form in the bearing code, says 0 (ordinary) level in the code do not said.

The rolling bearing is the mechanical components of a high degree of standardization and serialization of one of the parts, a single Angle contact bearings. Series suitable for mass production. Bearings and other parts of the fit, the provisions of the shaft bearing diameter and cooperate with the base hole drilling tolerance matching, the self-contained bearing outside diameter of holes with the base hole drilling tolerance matching. Are the inner and outer diameter bearing as a reference with reasonable choice .



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