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Rolling bearing combination layout depiction
Source: China Bearing Network Time: 2014-07-02
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(1). The two ends are fixed in one-way fixed short axis at normal working temperature (span L<400mm); the fulcrum is often selected by two-way one-way fixing method; each bearing is separated from the axial force in one direction. See Figure 17-15. There is a small amount of thermal expansion; bearing equipment should be left with 0. 25mm-0. 4mm axial clearance (void is very good. å³ å³ æ§é¼—觯 æ§é¼—觯 æ§é¼—觯 æ§é¼—觯 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜ S S S S 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜ 嫫虻髡è»ã•é¹˜.
(2). One end is fixed in two directions, one end is swimming when the shaft is long or the working temperature is high; the thermal expansion of the shaft is shortened; the fulcrum layout with one end fixed at one end and one end swimming should be selected. The fixed end receives the bidirectional shaft from a single bearing or bearing set. The moving end ensures that the shaft can move freely when it is elastic. To avoid loosening, the inner ring of the swimming bearing should be axially fixed with the shaft (usually using a circlip). Cylindrical roller bearings are used for swimming. When the fulcrum is used; the outer ring of the bearing should be axially fixed with the base; the movement between the roller and the ferrule ensures the free elasticity of the shaft.
(3). The two heads can be driven by the two-way swimming axis; the two-wheeled shaft system can be selected. It is a high-speed active shaft for the herringbone gear transmission; in order to actively compensate for the error of the helix angle on both sides of the gear teeth; It is recommended to arrange a small number of axial movements around the shaft; therefore, cylindrical roller bearings are used at both ends. It is necessary to fix the two ends of the low-speed gear shaft system with which the two shafts are axially positioned.
The bearing is usually positioned on the shaft with a shoulder or sleeve; the positioning end face and the axis adhere to excellent straightness. To ensure a firm positioning; the shoulder radius of the shoulder r1 is necessary to be smaller than the radius of the bearing. r. The height of the shoulder is usually not More than 3/4 of the inner ring height; too high is not easy to disassemble the bearing.
The axial fixing of the inner ring of the bearing should be based on the size of the axial load, such as the shaft end retaining ring, the round nut, and the elastic retaining ring for the shaft. The outer ring is the end face of the base, the circlip for the hole, the pressure plate, and the end cover. The method is fixed.
2 The cooperation of the bearing and the shaft or the bearing seat is intended to firmly fix the inner and outer rings to the shaft or the bearing housing; so that they do not attack each other harmfully. If the cooperation surface slips, abnormality will occur. Heat and wear; and the consequences of early damage and oscillation caused by the powder entering the bearing due to wear and tear. Jia Lun å²¢ 艹浞 11 11 11 11. 11. ; æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤– æ¤å¤–. The play is not only related to the working accuracy of the bearing; it affects its life.
The rolling bearing is a standard component; therefore, when the cooperation with the associated parts, the inner hole and the outer diameter are separated from the reference hole and the reference axis; the cooperation is not marked. The most important problem in the cooperation of the resolution is the load condition accepted by the inner and outer rings of the bearing. .
Generally speaking, if the scale is large, the load is large, the oscillation is large, the rotation speed is high, or the operating temperature is high, the cooperation should be selected tightly; while the ferrule is often disassembled or moved, the looser cooperation is used.
3 The rigidity of the bearing seat and the coaxiality shaft and the bearing seat must have the required rigidity; avoid the uneven deformation of the rolling body due to excessive deformation. Therefore, the wall of the bearing housing should have a satisfactory thickness; To add stiffness. In addition; the cantilever of the bearing housing should be shortened as much as possible.
It is necessary to ensure the coaxiality of the two bearing holes; to avoid the excessive skew of the inner and outer rings of the bearing. For this reason; the bearing dimensions of the two bearings are the same; for one boring; the error of coaxiality can be reduced. When the same axis is not installed When the bearing of the same outer diameter scale is used; the sleeve layout can be used to select the bearing with smaller equipment scale; the bearing hole can be pulled out once.
4 smooth and sealed (1). The smoothness of the smooth rolling bearing of the rolling bearing is mainly to reduce the conflict resistance and reduce the wear; together, it also has the effects of vibration absorption, cooling, rust prevention and sealing. Reasonable smoothness is the function of the progressive bearing; the service life of the extended bearing is of great significance.
The smooth material of the rolling bearing hungry has smooth oil, smooth grease and solid smoothing agent; the detailed smoothing method can be based on the speed element dn value.
The selection of the rolling bearing smoothing agent depends on the working conditions such as speed, load and temperature. Under normal circumstances, the viscosity of the selected smooth oil should not be lower than 13mm2/s~32mm2/s (the ball bearing oil viscosity is slightly lower and the roller bearing is slightly lower). High). Grease smooth bearing can be selected from calcium base grease at low speed and working temperature below 65 °C; sodium base grease or calcium sodium base grease at higher temperature, lithium base grease can be selected when high speed or load condition is messy, wet The environment can choose aluminum base grease or sulfhydryl grease; it is not suitable to use water-based sodium base grease.
(2). The sealing of the rolling bearing is to fully utilize the function of the bearing; to avoid the leakage of grease or oil in the smoothing agent; and to prevent harmful foreign matter from intruding into the bearing from the outside; therefore, it is necessary to use a thorough sealing. The sealing device is important for the bearing system. Depicting one of the links. Delineating the demand should be able to reach long-term sealing and dust-proof effects, conflicts and equipment errors. 徊 徊 ( (19) Barbie Awards 闱 闱 Q虻.
Seals can be divided into two types according to their different principles: touch seal and non-touch seal. Non-touch seals are not limited by speed. Touch seals can only be used in places with low online speed; to ensure the life of seals and Reduce shaft wear; shaft hardness should be above HRC40; surface roughness should be less than Ra1. 60μm- Ra0. 80μm.
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