What are the specifications of linear bearings, and what are the types of bearings?

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Of course, there are certain specifications, linear bearings are generally divided into two series, namely LM and LME series, and its code name LM series is used in Asia, Southeast Asian countries, Japan, South Korea, China, etc. Taking the metric size as the standard, the tolerance of the outer diameter of the linear axis is generally a series, which is mostly used in Europe, the United States, Germany, Italy and other regions. The imperial size is the standard, but there are also metric sizes, and the tolerance of the outer diameter of the linear axis is generally G6.

The structure of the two series is roughly the same, except for the different sizes and different aperture tolerances.

Example 1: LM 203242 UU OP

lm stands for Straight Line First Series Standard.

203242 represents the size structure of the aperture outer diameter and length.

UU stands for double seal construction and OP stands for open type.

Example 2: LME 203245 UU AJ

LME stands for Straight Line Second Series Standard.

203245 represents the size structure of the aperture outer diameter and length.

UU stands for Double Seal Construction AJ stands for Adjustable Clearance.

Plastic linear bearings can be divided into two series of LIN-11 and LIN-12 series, its code LIN-11 represents the European standard plastic linear bearings, while LIN-12 series is a narrow design, mainly designed to save installation space; The difference between the two series is that the LIN-11 series is mounted with a circlip limit, while the LIN-12 series is directly installed with its outer diameter and the mounting seat hole.

Bearing types are complete, there are many types of bearings, different equipment and speed and accuracy need to use the bearings are also different, bearing types of bearings are classified according to the size of rolling bearings: miniature bearings, small bearings, small and medium-sized bearings, medium and large bearings, large bearings, extra-large bearings. Bearings are divided into the following according to the type of rolling element in which they are:

Ball bearings, roller bearings.

Among them, roller bearings are divided into cylindrical roller bearings, needle roller bearings, tapered roller bearings, and spherical roller bearings according to the type of rollers. Bearings can be divided into self-aligning bearings and non-self-aligning bearings according to whether they can be adjusted during work.

Bearings are classified according to the structural type of rolling bearings: radial bearings, thrust bearings, axial contact bearings, and thrust angular contact bearings.

There are two types of bearings: one is a plain bearing, and the other is a rolling bearing.

Sliding bearings: according to the load, there are: radial bearings, thrust bearings, according to the lubrication state between the sliding surfaces: liquid lubricated bearings, incomplete liquid lubricated rough bearings, non-lubricated bearings.

Rolling bearings: spherical ball bearings, spherical roller bearings, tapered roller bearings, double row deep groove ball bearings, thrust ball bearings, deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, needle roller bearings.

Bearings are common parts in machinery and equipment that can support rotating or reciprocating shafts. According to different structures and functions, bearings can be divided into many types. Among them, common bearing types include:

1.Rolling bearing: It is composed of the inner leakage outer ring and the rolling element (steel ball or roller), which can bear the load through rolling friction, and can be divided into ball bearing, tapered roller bearing, needle roller bearing, etc.

2.Plain bearing: composed of an inner and outer sleeve and a gasket (metal, polymer or composite material), which bears the load through sliding friction, and can be divided into dry plain bearing, lubricated plain bearing, etc.

3.Hydrostatic bearing: Through the external hydraulic pressure, the liquid is pressed in the middle of the bearing to form a liquid film, so as to support the movement of the shaft, which is suitable for high-speed and high-precision occasions.

4.Magnetic bearing: using the principle of electromagnetic induction, the magnetic field is generated, so as to support the shaft movement, which is suitable for high-speed, high-temperature and pollution-free occasions.

Bearings are divided into radial bearings and thrust bearings according to different bearing directions or nominal contact angles.

According to the type of rolling elements, it is divided into ball bearings, roller bearings, self-aligning bearings, non-self-aligning bearings (rigid bearings) according to whether it can be aligned, and it is divided into single-row bearings, double-row bearings, and multi-row bearings according to the number of columns of rolling elements.

This kind of bearing is equipped with spherical rollers between the outer ring of the spherical raceway and the inner ring of the double raceway, which is divided into four types: R, RH, RHA and SR according to the different internal structures, because the arc center of the outer ring raceway is consistent with the center of the bearing, it has self-aligning performance, so it can automatically adjust the shaft malalignment caused by the deflection or misalignment of the shaft or shell, and can bear radial load and two-way axial load.