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A detailed discussion of the problems that should be considered when the roll bearing combination is drawn
Source: China Bearing Network Time: 2013-02-28
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1) Shaft support end layout; 2) Bearing and associated parts cooperation; 3) Bearing smoothness and sealing; 4) Progressive bearing system stiffness.
One or two fixed (two-way fixed) short shaft at normal working temperature (span L<400mm); the fulcrum often uses two-way one-way fixing method; each bearing receives an axial force in one direction. There is a small amount of thermal expansion during the shaft operation; the bearing device should have an axial clearance of 0. 25mm-0. 4mm (the gap is very large. å³ å¿Œ æ§é¼— æ§é¼— ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Features: Two-way movement of the constrained shaft. Suitable for shafts where the operating temperature does not change much.
Pay attention to: think about the elongation of heat; leave the gap between the bearing cap and the outer end face c; c = 0. 2 ~ 0. 3mm.
Second, one end is fixed in two directions, one end swims when the shaft is long or the operating 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 is accepted by a single bearing or bearing group Two-way axial force; while the swimming end ensures that the shaft can move freely when it is elastic. To prevent loosening; the inner ring of the swimming bearing should be axially fixed with the shaft (usually using elastic retaining ring). Cylindrical roller bearing When swimming the fulcrum; the outer ring of the bearing should be axially fixed with the base; the movement between the roller and the ferrule ensures the flexibility of the shaft.
Features: one fulcrum is fixed in both directions; the other fulcrum is used for axial movement.
Deep groove ball bearing as the fulcrum of the swimming; the outer ring of the bearing and the end cover leave a gap.
Cylindrical roller bearing as a fulcrum; the outer ring of the bearing should be fixed in both directions.
Applicable: long axis with large temperature change.
Third, the adjustment of the bearing combination 1. Adjustment and adjustment of bearing clearance:
(1) Adjust the thickness of the bearing cap and the base of the machine base; (2) Adjust the movement of the bearing outer ring gland with screws.
2. Bearing pre-tightening intention: improve accuracy, stiffness; reduce oscillation.
When the device is installed, the bearing must adhere to a certain axial force according to the pre-tightening force requirement of the bearing; then it must ensure a certain clearance; The adjustment of the bearing assembly orientation allows the on-axis parts (gears, pulleys, etc.) to have a precise working orientation.
Fourth, the rolling bearing of the rolling bearing is generally inconsistent with the whole machine; the demand is repeatedly replaced during the application; when the parts with the installation contact with the bearing are damaged, the bearing needs to be disassembled; The bearing should be such that the disassembly force is not transmitted through the rolling body; in order to prevent plastic deformation of the rolling body.
Demolition of the rolling bearing generally uses special things; the drawing of the shafting layout should leave room for the use of things; these data can be found in the rolling bearing manual.
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