high speed ball slewing ring bearing in stock

1.The working principle and working mode of the slewing ring bearing

Slewing ring bearings are widely used in machinery, such as excavators, disintegrators, stackers and reclaimers, graders, road rollers, and roadheaders. Not only that, but also in new energy equipment, amusement equipment, metallurgical equipment, etc. It also has its application in China, so what is the working principle and working method of the slewing bearing?

First, the working principle of the slewing ring bearing
The working principle of the slewing ring bearing is to move the object from sliding to rolling to reduce frictional resistance. It mainly relies on lubrication and friction to achieve the purpose of operation. Internally, it relies on the mutual friction of balls and steel rings.

The friction between the bearing and other parts runs, rubs against each other, and drives the object to operate. Although it relies on friction to operate, lubrication is also indispensable. If it is used for a long time and the friction is too large, it will also affect the application of parts. Therefore, after using this kind of bearing for a period of time, it should be maintained in time. , brush some lubricating oil.

2. How the slewing ring bearing works

1. Point contact scrolling
The working principle of point contact rolling is mainly used for four-point contact ball slewing bearing and crossed roller slewing bearing. This working principle has higher requirements on the quality of steel balls for the combined bearing of point contact radial and axial forces, and the angle of the track should be uniform.

2. Rolling and sliding combined rolling type
The rolling-slip combined rolling working principle is mainly used for the ball-column combined slewing ring bearing. This principle has the advantages of small eccentricity and long service life, and has the advantages of the double structure of the roller and the ball.

3. Surface contact rolling and sliding combination
The working principle of surface contact rolling and sliding combination is mainly used for turntable bearings. Now the new type of slewing bearing has a compact structure and high precision, so it is suitable to use the surface contact rolling and sliding combination.

4. Surface contact rolling combination
The surface contact rolling combined working principle is mainly used for three-row roller slewing bearing, its advantage is that the contact surface is large, the bearing force is uniform and the rolling is flexible.

2.Installation method of non-standard slewing ring bearings

1. Cleaning before installation
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If there are bumps, rust layers, wear debris, sand, dust and mud on the bearing assembly surface and the surface of the parts that match it, firstly, the bearing is difficult to install, resulting in incorrect assembly position; secondly, these attachments form abrasive, easy to The working surface of the non-standard bearing will be rubbed and the assembly quality will be affected.

Therefore, the surface of the journal, the surface of the bearing housing shell, the end face of the shoulder, and the mating surface of the connecting parts such as bushings, washers, ends, etc., should be carefully inspected before installation. If there is a rust layer, it can be removed with a fine file, polished with a fine emery cloth, and the attachments on the bearing assembly surface and its connecting parts should also be removed.
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2. Install according to the installation instructions
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For slewing ring bearings with separable inner and outer rings, do not exchange the outer rings with each other to avoid affecting the contact quality. For non-standard bearings, do not arbitrarily remove the rolling elements in the bearing and mix them, so as to avoid the installation position disorder affecting the accuracy.
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When installing the bearing, in order to facilitate the viewing of the bearing code and not to make mistakes, the bearing ring should be placed and installed with the typing surface facing outward.

3. Heating installation
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For medium and large bearings with large interference, in order to facilitate installation, they must be heated before installation; for tight fit light metal bearing housing holes (such as aluminum bearing housings), due to the low hardness, in order to prevent the bearing outer ring from being pressed into If the surface of the housing hole of the bearing housing is scratched or scratched, it should also be heated and installed.
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The heating method is generally to put the bearing or separable bearing ring into the oil tank filled with clean oil, so that the oil submerges the non-standard bearing and heats it evenly. When the temperature reaches 80-90 ℃, take it out, wipe it, and install it while it is still hot.

The fuel tank can be made of 2-3mm thick iron plate, a porous iron plate is added at a height of 50-70mm from the bottom of the tank, and the bearing is placed on the porous iron plate for heating. The purpose is to avoid the impurities deposited in the oil from entering the bearing.
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However, for bearings with dust caps or sealing rings on both sides, since lubricants have been added during manufacture, they cannot be heated in the early stage of installation.