Analysis of typical structure of sliding bearing sliding bearing and rolling bearing is the same, also belong to the support, but because the interaction between bearing starting friction resistance, maintenance is more trouble, therefore, in many cases, customers will choose the use of rolling bearings. The structure of sliding bearing, which is with the friction state and loading direction on the structure, generally by the bearing, bearing, lubrication and sealing device etc. and has a variety of forms, there are mainly five kinds of classic structure.
1, through the sliding bearings
The utility model relates to an integral radial sliding bearing, which is composed of a bearing seat, an integral bearing bush and a tight setting screw. Bolt and base are connected with the bearing seat, the top is provided with a screw thread hole into the oil or the installation. A sleeve type bush (or short sleeve) made of bearing material is pressed into the bearing seat. Some machines do not use a dedicated bearing seat, and the Bush (or bushing) directly installed in the frame or airframe Kong Zhong, such as machine tools, reducer and so on.
The utility model has the advantages of simple structure, easy fabrication and low cost, and the disadvantage is that the clearance of the bearing bush can not be adjusted and the axle neck can only be loaded from the end part. Therefore, it is only suitable for low speed light load or intermittent working machines.
2, split
The typical structure of split radial plain bearings consists of bearing housings, bearing housings, split bearings and bolts. The utility model is mainly used for loading the direction perpendicular to the bearing mounting datum plane. An oblique split structure used for loading and bearing surfaces at an angle (usually 45 degrees). The bearing cover is provided with threaded holes for installation of lubricating oil supply. The bearing seat and the cover section often make the ladder shaped, so that the processing and installation location and to prevent work dislocation. In the shell split surface, usually with some thin gasket, when the bearing worn, can be removed by gasket to adjust the radial clearance of bearings. This kind of structure, because the bearing cover can be opened, so the dismounting and maintenance is convenient, but the structure is complex, the price is more expensive.
3, automatic self-aligning
When the bearing width is large, the bending deformation of the shaft or the inclination of the bearing hole and the installation error are larger, it will cause the partial contact between the journal and the Bush at the two ends, thus causing severe wear and fever. The bigger the bearing width is, the more serious the phenomenon is. Therefore, when the width diameter ratio is B/d > 1.5, automatic self-aligning type bearings should be adopted.
The convex spherical surface is matched with the concave ball surface on the bearing cap and the bearing seat, and the spherical center passes through the axis of the shaft neck. Therefore, the bush can bear the self-aligning position of the bending or tilting of the axle, so as to ensure the uniform contact between the journal and the bush.
4 ?adjustable clearance
When working, the Bush and the journal surface must wear, and then the bearing gap will gradually increase. When it reaches a certain extent, it will affect the normal working and running accuracy of the machine. Therefore, the bearings with adjustable clearance are used for bearings which are easy to produce larger wear clearance and higher running accuracy.
The structure of this kind of bearing is a kind of structure commonly used. The outer surface of the bearing bush is cone-shaped, and the outer surface of the bearing bush is tapered, and is matched with a shaft sleeve with an inner conical surface, and a longitudinal cutting groove is arranged on the bearing bush. The nut gap at both ends of the shaft sleeve can be used to adjust the shaft and bearing, structure for conical shaft neck, its bearing made of inner taper hole and cone shaft matched, thereby omitting the sleeve. In order to make the sleeve (Bush) easy to move axially during assembly or adjustment, the contact area between the Bush and the journal should be minimized when the structure is designed. The taper of a cone surface is usually 1:30~1:10. The utility model adjusts the clearance of the bearing by changing the axial relative position between the shaft and the Bush through both ends of the nut.
5, thrust sliding bearings
Thrust bearing can only bear axial load, it is composed of bearing seat and thrust shaft neck. Combined with radial bearing, it can bear axial and radial load simultaneously.
Solid end thrust bearings, the pressure distribution on the contact surface of this kind of bearing is uneven, and the part near the edge is worn faster and is seldom used.
The hollow end face thrust bearing reduces the contact area and improves the lubrication conditions, thus avoiding some disadvantages of the hollow type.
The single ring thrust bearing utilizes the annular end face of the journal bearing, and has simple structure. It is often used in low speed and light load occasions.
The multi ring thrust bearing adopts a plurality of rings to bear axial load, improves the carrying capacity, and can also bear the axial load in two directions.
The pressure distribution of the solid type on the contact surface is uneven, the pressure at the center is high, the supporting surface is wearing fast and is seldom used. The pressure distribution on the contact surface of the hollow support is more uniform, and the lubrication condition is improved. Single ring is the use of thrust end thrust, simple structure, easy lubrication, widely used in low speed light load occasions. The multi ring structure features single ring type and can be used in heavy duty occasions. Analysis of typical structure of sliding bearing sliding bearing and rolling bearing is the same, also belong to the support, but because the interaction between bearing starting friction resistance, maintenance is more trouble, therefore, in many cases, customers will choose the use of rolling bearings. The structure of sliding bearing, which is with the friction state and loading direction on the structure, generally by the bearing, bearing, lubrication and sealing device etc. and has a variety of forms, there are mainly five kinds of classic structure.
1, through the sliding bearings
The utility model relates to an integral radial sliding bearing, which is composed of a bearing seat, an integral bearing bush and a tight setting screw. The bearing seat is bolted to the base and the top is filled with oil |
