Bearing cooperation with shaft and housing

Source: China Bearing Network Time: 2014-04-25

/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

In the support part of the machine; in order to prevent the bearing inner ring and the shaft, the outer ring and the outer ring hole from slipping relative to each other during machine operation; it is necessary to have a simple and useful method. Especially for the thin-walled ring of the ultra-light and ultra-light series bearings. Select appropriate tight cooperation; the bearing ring can be evenly stressed during operation; so that the bearing of the bearing tumbler can be more evenly played. However, the selected bearing cooperation can not be too tight; due to the elasticity of the inner ring The expansion and the shortening of the outer ring will be reduced by the internal clearance of the bearing; until it is completely gone; then it will affect the normal operation of the bearing.
1. Bearing cooperation selection (1) cylindrical inner bore bearing selection of bearing cooperation should consider several main factors as follows:
1 The type of load is based on the effect on the bearing; the rotation of the ferrule; the load accepted by the ferrule can be divided into three types: fixed load, reverse load and rocking load.
a. The radial load consisting of the fixed load is accepted by the rim portion of the ferrule; and correspondingly transmitted to the corresponding part of the shaft or the outer surface of the outer casing. This load is called a fixed load.
The fixed load is characterized by a radial load that is relatively stopped with the ferrule. A ferrule that accepts a fixed load can usually be loosened.
b. The reverse load effect is applied to the radial load vector of the bearing ring to rotate along the circumferential direction of the raceway; it is sequentially accepted by each part of the raceway; and correspondingly transmitted to various parts of the outer surface of the shaft housing bore. Called reverse load; also known as cyclic load.
The reverse load is characterized by the radial load vector and the ferrule relative rotation. The ferrule and the shaft or the housing hole that accepts the reverse load should use filtering or interference cooperation. If the gap cooperation device is selected; Then it will cause contact surface wear and collision heat; make the temperature rise sharply; the bearing will be damaged quickly. The size of the wanted excess is determined according to the working conditions; when the bearing is working under the load effect; The "åŒåŒ" representation is presented as a criterion on the cooperative appearance inside the shaft or the shell hole.
C. The swaying load effect on the bearing ferrule constitutes a radial load vector that oscillates in a certain area of â€‹â€‹the ferrule raceway; it is accepted by a certain area of â€‹â€‹the raceway; and is transmitted to a certain area of â€‹â€‹the outer surface of the shaft or the outer casing hole; or the effect The load on the bearing is the impact load, the oscillating load; the load direction or value often changes; this load is called the sway load; it is also called the directional load.
When the bearing receives the rocking load; especially when receiving heavy load; the inner and outer rings should be selected for interference cooperation. When the inner ring is rocking and rotating; usually the inner ring is selected for cooperation when reversed the load. However, sometimes the outer ring needs to be outside the outer casing. When the bearing can swim or its load is light; it can be used with a slightly looser cooperation than the reverse load.
2 load of the thin bearing ring under the radial weight effect of the load; its radial will be tightened; easy to attract cooperation; especially in the case of heavy reversal load; simple episode of slippage. Thus; Occasion; usually should be more tight than light load and normal load occasions. Total return; the heavier the load; the greater the cooperation interference should be.
3 working temperature bearing during operation; because the working temperature of the ferrule is usually higher than the temperature of the adjacent parts; the inner ring of the bearing can loosen with the bearing due to thermal expansion; the outer ring can affect the axial direction of the bearing due to thermal expansion. Clearance; therefore; when selecting cooperation; it is necessary to pay attention to the temperature difference between the ferrules and the direction of heat conduction.
4 Rotational accuracy When the requirements for the rotation accuracy of the bearing and the smoothness of the work are high; in order to eliminate the influence of the elastic deformation and oscillation of the bearing components;
The layout and material of the 5-axis and the outer casing are irregular in shape if the shaft and the outer casing (box) are open; the abnormal deformation of the inner and outer rings of the bearing will occur; and the force is not uniform. The split casing (box) body; The cooperation of the outer ring of the bearing should not be used for interference cooperation; however, the outer ring should not be transformed in the outer casing (box) hole. When the bearing device is on the thin-walled, light-alloy casing (box) hole or hollow shaft; in order to ensure the bearing Satisfactory bearing surface; should choose the cooperation of the device in the thick-walled shell (box) body, cast iron shell (box) body or solid shaft.
6 device and disassembly in many messy layouts; in order to facilitate the installation and disassembly; need to use the gap cooperation. According to the bearing operation conditions; if necessary to use the interference cooperation device; then optional separate bearings (inner and outer ring Can be equipped with cylindrical roller bearings, needle bearings, tapered roller bearings and thrust bearings) or tapered inner bore bearings; can make loading and unloading simple.
7 Axial displacement of non-fixed end bearings This displacement means that a ferrule of a bearing at the non-fixed end of the demand device can have a certain play clearance in the axial direction. The ferrule (usually the outer ring) will usually receive a fixed load. ) Cooperate with the gap. If the cylindrical roller bearing (2000 type and 3200 type) or the needle bearing device with no inner ring or outer ring is used at the non-fixed end; the inner and outer rings are all equipped with interference cooperation device.
(2) Bearings with conical inner bore bearing conical inner bore; the device is convenient to disassemble; the central sleeve can be directly mounted on the tapered journal or the outer taper cylinder (tight sleeve, Retract the sleeve); then the central sleeve is mounted on the cylindrical shaft together.
The cooperation between the outer ring of the bearing and the hole of the outer casing (box) is the same as that of the cylindrical inner bore bearing.
Non-displacement bearing with adapter sleeve or withdrawal bushing; can be used for larger bearings in public service; however, it is necessary to strictly control the shape of the shaft.
2. The cooperation between the bearing and the shaft and the outer casing of the bearing and the shaft is selected from the base hole; the cooperation between the bearing and the outer casing is based on the base shaft. The cooperation between the bearing and the shaft is different from the public service cooperation criterion selected in the machine manufacturing industry; The public service is mostly negative public service; therefore; under the same cooperation conditions; the cooperation between the inner diameter of the bearing and the shaft is more strict than the usual cooperation. The outer diameter of the bearing is the negative public service; but its public service value and the usual The public service guidelines are also different.

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