Linear bearing Metal linear bearing is a linear motion system produced at low cost, used in conjunction with a cylindrical shaft with an infinite stroke. It is widely used in sliding parts of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, printing machinery and so on.
Introduction 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 achieve 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.
Since the bearing ball is in point contact with the bearing, the use load is small. The steel ball rotates with very little frictional resistance, so that high-precision and smooth motion can be obtained.
Plastic linear bearings are a kind of linear motion system with self-lubricating characteristics. The biggest difference from metal linear bearings is that metal linear bearings have rolling friction, and the bearing and cylindrical shaft are in point contact, so this is suitable for low-load and high-speed motion; Plastic linear bearings are sliding friction, and there is surface contact between the bearing and the cylindrical shaft, so this type is suitable for high-load, low-speed movement.
Classification (1) Standard type, clearance adjustment type linear bearing, open type linear bearing, extended type linear bearing, general type linear bearing
(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. With 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. The inch size is the standard, and 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 cylinder type (the shape is like a cylinder, generally installed with a circlip, used for occasions with small installation dimensions)
2: Flange type (there is a mounting flange at the end or in the middle, which can be installed with screws. The flanges are 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)
Linear bearings are more and more widely used in electronic equipment, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machinery, instruments, robots, tool machinery, CNC machine tools, automobiles and digital three-dimensional coordinate measuring equipment and other precision Equipment or special machinery industry.