Introduction to Rolling Bearings
- 2022/6/28 11:40:05
Rolling bearings are generally composed of rings (inner and outer rings), rolling elements (balls or rollers) and cages. That is, several rolling elements are arranged between the inner ring and the outer ring, and the rolling elements are kept at a certain distance from each other by the cage, and the rolling elements are not in contact with each other, so as to realize the structure of smooth rolling motion.
1.Ferrules (inner and outer rings) or washers
The surface on which the rolling elements roll is called the "raceway surface", and this contact surface carries all the loads of the bearing.
Usually the inner ring is fitted with the shaft, while the outer ring is fitted with the bearing housing.
In thrust bearings, we generally call the ferrule as "washer", the inner ring as "shaft washer", and the outer ring as "seat ring".
The rolling elements are divided into two categories: balls and rollers. According to the different shapes of the rollers, it is generally divided into: cylindrical rollers, needle rollers, tapered rollers and spherical rollers. Geometrically, the contact between the rolling elements and the raceway surfaces of the inner ring and the outer ring is point contact if the rolling element is a ball, and line contact if the rolling element is a roller. Theoretically, the rolling elements revolve while rolling along the raceway surface.
The cage does not directly bear the load, it is only used to keep the rolling elements in the correct position with a certain distance, and at the same time prevent the rolling elements from falling off when the bearing is installed. According to the different production methods, the cages are classified into stamping, lathe and integrated cages.
4.Classification by rolling bearing structure type
(1)Cylindrical roller bearing: The rolling elements of the crossed roller bearing are cylindrical rollers, which are vertically arranged at 90 degrees in the V-shaped raceway, and the rollers are separated by spacers. This structure can bear the loads of various aspects such as axial load, radial load and overturning load.
Applicable to: joint parts or rotating parts of industrial robots, rotary table of machining center, rotary part of manipulator, precision rotary table, medical equipment, measuring instruments and other occasions.
(2)Tapered roller bearing: Crossed tapered roller bearing is a variant of crossed cylindrical roller bearing. The tapered rollers are arranged laterally, each roller is perpendicular to the adjacent rollers, and the intersection of the extension line of the rolling element generatrix should be located at the rotation of the bearing. in line.
Can be widely used in: high-speed vertical lathes, high-precision workbenches, vertical boring machines, grinding machine spindles, etc.
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