Linear bearing is a kind of linear motion system, used for linear stroke and cylindrical shaft. Because the load-bearing ball is in point contact with the bearing jacket, the steel ball rolls with the least frictional resistance. Therefore, the linear bearing has low friction, is relatively stable, does not change with the bearing speed, and can obtain smooth linear motion with high sensitivity and high accuracy. The consumption of linear bearings also has its limitations. The most important thing is that the impact load capacity of the bearing is poor, and the carrying capacity is also poor. Secondly, the linear bearing has greater vibration and noise during high-speed motion. Automatic selection of linear bearings is included. Linear bearings are widely used in sliding parts of precision machine tools, textile machinery, food packaging machinery, printing machinery and other industrial machinery.
(1) Standard type, clearance adjustment type linear bearings, open type linear bearings, extended type linear bearings, general-purpose linear bearings
(2) Flanged linear bearings can be divided into: round flange type, method flange type, oval flange type, guided round flange type, guided method blue type, guided oval flange type, and extended round flange type.
According to specifications:
It is divided into two series, namely LM and LME series. Its code name LM series is used in Asia, Southeast Asian countries, Japan, Korea, China, etc. Taking the metric size as the standard, the outer diameter tolerance of the linear shaft is generally h7. LME series are mostly used in Europe, America, Germany, Italy and other regions. With inch size as the standard, there are also metric sizes. The outer diameter tolerance of the linear shaft is generally g6. The structural characteristics of the two series are roughly the same except for the different sizes and aperture tolerances.
According to the shape:
1: Straight type (shape like a cylinder, generally installed with a circlip, used for occasions with small installation size)
2: Flange type (the end or the middle has a mounting flange, which can be installed with screws. The flange is generally divided into three types: round, square and trimmed)
3: Open type (shape like a straight cylinder, with axial slits on the outside, used in occasions where gap adjustment is required, divided into two types: large opening and small opening)
According to performance points:
1: Ordinary type (used for general performance requirements)
2: Super type (for long life and high load performance requirements)