Bearing Accessories

Bearing classification

Plain bearing

Sliding bearings have neither inner and outer rings nor rolling elements, and are generally made of wear-resistant materials. Commonly used in low speed, light load and mechanical rotating parts that are difficult to lubricate and maintain.

Spherical plain bearing

The sliding contact surface of the spherical plain bearing is spherical, which is mainly suitable for swing motion, tilt motion and rotary motion.

Rolling bearing

Rolling bearings are divided into radial bearings and thrust bearings according to the load direction or nominal contact angle they can bear. The radial contact bearing is a radial bearing with a nominal contact angle of 0, and the radial angular contact bearing is a radial bearing with a nominal contact angle greater than 0 to 45. Axial contact bearings are thrust bearings with a nominal contact angle of 90, and thrust angular contact bearings are thrust bearings with a nominal contact angle greater than 45 but less than 90.

According to the shape of the rolling elements, it can be divided into ball bearings and roller bearings. Roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings and spherical roller bearings according to the types of rollers.

According to whether it can be self-aligning at work, it can be divided into self-aligning bearings----the raceway is spherical, which can adapt to the angular deviation and angular movement between the two raceway axis lines and non-aligning bearings (rigid bearings) ---- Bearings that can resist the angular deviation of the axis line between the raceways.

According to the number of rows of rolling elements, it is divided into single-row bearings, double-row bearings and multi-row bearings.

According to whether its parts (rings) can be separated, it can be divided into separable bearings and non-separable bearings.

According to its structural shape (if there is no filling groove, with or without the shape of the inner and outer rings and the ferrule, the structure of the rib, and even with or without a cage, etc.), it can also be divided into various structural types.

According to its outer diameter, it is divided into miniature bearings (<26mm), small bearings (28-55mm), medium and small bearings (60-115), medium and large bearings (120-190mm), large bearings (200-430mm) and special bearings. Large bearing (>440mm).

According to the application field, it is divided into motor bearings, rolling mill bearings, main bearings, etc.

According to the material, it is divided into ceramic bearings, plastic bearings, etc.

Bearing parameters

Life

Under a certain load, the number of revolutions or hours that a bearing experiences before pitting occurs is called bearing life.

The life of a rolling bearing is defined by the number of revolutions (or hours of work at a certain speed): within this life, the bearing should have initial fatigue damage (spalling or chipping) on any of its bearing rings or rolling elements. However, whether in laboratory tests or in actual use, it can be clearly seen that the actual life of bearings with the same appearance under the same working conditions is very different. In addition, there are several different definitions of bearing "life", one of which is the so-called "working life", which indicates the actual life that a bearing can achieve before failure is due to wear, damage is usually not caused by fatigue, but Caused by wear, corrosion, seal damage, etc.

In order to determine the standard of bearing life, the bearing life and reliability are related.

Due to the difference in manufacturing precision and material uniformity, even the same batch of bearings of the same material and size, used under the same working conditions, have different life spans. If the statistical life is 1 unit, the longest relative life is 4 units, the shortest is 0.1-0.2 unit, and the ratio of the longest to the shortest life is 20-40 times. 90% of bearings do not produce pitting corrosion, and the number of revolutions or hours experienced is called bearing rating life.

Rated dynamic load

In order to compare the bearing capacity of the bearing against pitting corrosion, when the rated life of the bearing is specified to be one million revolutions (106), the maximum load that can be supported is the basic rated dynamic load, represented by C.

That is to say, under the action of the rated dynamic load C, the reliability of this kind of bearing working for one million revolutions (106) without pitting failure is 90%. The larger the C, the higher the bearing capacity.

For basic dynamic load rating

1. Radial bearing refers to pure radial load

2. Thrust ball bearings refer to pure axial loads

3. Radial thrust bearing refers to the radial component that produces pure radial displacement

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