Talking about the gear grinding technology of slewing bearing

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As a process to be realized by precision products, the situation of grinding teeth needs to be noted, and what kind of technical indicators should be achieved. This article analyzes one by one. Regarding the slewing bearing or slewing bearing, whether external or internal teeth, helical teeth, etc., the normal process level, there are gear shaping, gear hobbing, and milling gears, according to the design standard, the general standard of gear accuracy is 9 teeth or 10 teeth. Here 9-level teeth or 10-level teeth, the index to be investigated is based on the design standard of the slewing bearing of JB/T10471, and you can also refer to JB/T2300.

mainly reflects the rotation accuracy, the specific indicators are:

1, the number of teeth across and the length of the common normal;

2, common normal deviation

3. Tooth jump (tooth jump of the finished slewing bearing);

4. Tooth width, tooth thickness, tooth profile and tooth direction are generally not marked separately in the drawings.

In short, the value of the 9th grade or 10th grade of the slewing bearing is the same in a pure sense. In terms of design concepts, the common normals of grade 7 and grade 8 teeth, and the tooth jump also meets the design requirements. However, tooth surface quenching has a great impact on the accuracy of the tooth surface, generally one step backward.

Slewing bearing

The following effects can be achieved by grinding teeth:

1. Improve meshing accuracy;

2, tooth jump 0.06-0.15mm;

3, tooth surface roughness Ra0.8;

4. Reduce meshing noise;

5. Reduce the wear strength of the tooth surface.

Gear grinding, improve the roughness of the gear, and then improve the accuracy of the gear, including the common normal of the gear, the tooth jump, the smoothness has a qualitative leap, and the meshing accuracy is also greatly improved.

Oil leakage of slewing ring

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The slewing bearing is responsible for the operation and rotation of marine equipment, engineering machinery, light industry machinery, metallurgical machinery, medical machinery, and industrial machinery and equipment. It is an important transmission component necessary for machinery that needs to bear axial force, radial force, and tipping moment. . Therefore, the consideration of performance guarantee in the structural design of the slewing bearing cannot be said to be insufficient.

 

The rotating structure needs sufficient lubrication, and the slewing bearing is no exception. The grease lubrication of the rotating part of the bearing is divided into two cavities: the slewing bearing lubrication cavity and the rotating gear ring lubricating cavity. The lubrication of the slewing bearing is completed by adding lubricating grease to the lubricating nipple located in the outer ring of the slewing bearing, and the lubrication of the slewing ring gear is completed by pre-filled grease. The slewing bearing has two rubber strips inside and outside (or upper and lower) as oil seals. The outer oil seal is fixed on the inner ring (fixed plate) of the slewing bearing of the lower frame to prevent dust from entering the slewing bearing. The inner oil seal is located on the outer ring (moving disc) of the bearing to prevent grease in the rotary gear ring from entering the bearing.

 

However, equipment and related accessories will be affected by a variety of comprehensive factors in actual use, and abnormal phenomena are inevitable. The oil leakage of turntable bearings is one of the common failure phenomena.

 

Generally, it is normal for a small amount of oil leakage in the outer oil seal under working conditions. The so-called normal means that the amount of grease leaking through the outer seal of the slewing bearing is approximately equal to the amount of grease added to the slewing bearing. However, when an abnormal phenomenon of a large amount of grease leakage occurs on the excavator, it should be checked. Due to the particularity of the lubrication structure of the rotating part, it is necessary to analyze whether there is a leakage and determine the problem in order to solve the problem.

 

Since the grease filled in the original equipment may be incorrect, the grease will become thinner when the temperature of the slewing bearing or the slewing ring gear rises slightly. If the thinned grease is pushed to the upper section of the ring gear during the meshing process by the driving gear of the rotary motor, it will flow into the bearing cavity through the inner oil seal, and the grease will drip out from the outer oil seal.

Discuss the stability of the slewing bearing

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For equipment installed with slewing bearings, corresponding performance is the focus of users’ attention, and often requires high accuracy. In the application of equipment, the stability of the slewing bearing can meet the requirements of the special work nature of construction equipment, including bearing large axial load, radial load and overturning moment and other comprehensive loads. The following editor will discuss the stability of the slewing bearing with everyone:

In the design of accessories, the rolling elements are usually separated by separate blocks. This structure can maintain the smoothness of movement, so it is widely used. Special applications require special ball or roller spacers. Bearings installed on horizontal shafts or continuously rotating generators and bearings used in occasions with high requirements for positioning and reliability can use strip combined cages to keep the rolling elements in the correct circumferential position .

The purpose of using cages for slewing bearings is very clear: improve bearing rotation performance and efficiency, consolidate bearing stability and reliability, improve bearing design life and service life, and solve the problems of uniform force and bearing structure under complex working conditions . Integral cage-segmented cage-copper cage-steel cage-polyurethane cage-nylon cage-polytetrafluoroethylene cage-PA cage, and composite material cage.

 

Slewing bearing

 

In addition, for slewing bearings, stability and reliability are the two core indicators considered in the selection and design of slewing bearings. The main process design considerations are: structure; material; modulation hardness and quenching hardness; bearing rolling elements and The height and wall thickness ratio of the ferrule; machining accuracy; the material, structure and type of the cage, such as the integral cage, can obviously improve the rotation performance and life of the bearing; the lubrication system and the sealing system; the level of installation and debugging; the daily maintenance Frequency; application of mature design.

In order to ensure the stability of construction equipment, the design of slewing bearings pays more attention to the rationality of the structural configuration, but in many cases, gear teeth can be machined on the inner or outer ring of the bearing to simplify the structure of the drive system. In order to avoid problems, when determining the structure of the drive system, you should seek the help of relevant personnel in the gear.

The above is the discussion about the stability of the slewing bearing. The design of pipe fittings pursues higher performance, but in actual applications, once installation, use or maintenance is improper, various problems may arise, such as in the slewing bearing. There was a problem of excessive shaking during use. The common causes of this are loose installation bolts, causing shaking during work; insufficient rigidity of the steel structure supporting the slewing bearing, elastic deformation during loading, resulting in overall shaking of the slewing bearing, etc., in order to ensure the normal use of the slewing bearing, if you If there is shaking in the machine, it is necessary to stop the machine for inspection in time to prevent long-term shaking from causing greater damage to the slewing bearing

Positioner Slewing Bearing

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Positioner slewing ring bearings can be used in various industries and play a very important role in our daily life, such as large construction machinery, and small bus accessories that are usually seated.

 

Guidelines for understanding the planning and production requirements of positioner slewing bearings

 

The positioner slewing bearing needs to accept a larger induction load, and its quality requirements are relatively high. Special attention should be paid to the installation to avoid affecting normal operation. The positioner slewing bearing needs to understand certain guidelines when planning and manufacturing. What is required to understand in detail? Here is a detailed introduction for everyone.

 

 

Positioner slewing bearings need to be selected according to operating conditions when planning and manufacturing. For bearings operating at room temperature, chrome bearing steel is required. If the temperature of the principality is higher than 150°C and lower than 250°C, chrome bearing steel is also required. The use of chromium bearing steel requires special heat treatment to avoid affecting normal use.

 

The choice of material for the positioner slewing bearing is particularly important. Because of the need to accept greater impact loads, chromium bearing steel is generally not used. Most of them will choose high-quality carburized structural steel, impact-resistant tool steel, and quenched and tempered structural steel. For corrosive media, corrosion-resistant alloy steel should be selected, which can extend its service life.

 

Because the structure of the bearing parts is relatively complex, the outer ring is equipped with ribs, and it is also required to accept larger impact loads, it is necessary to adopt carburized steel with good processing functions. The outer ring of stamped needle roller bearings can be selected from 08 and 10 low carbon steel. This material steel has better plasticity, so it is more suitable for cold stamping. Swing arrangement and operation arrangement use joint bearings, and use high-performance cold plastic steel.

 

The quality of the positioner slewing bearing depends to a certain extent on the purity of the steel and the uniformity of the arrangement. Following the continuous improvement of the exercise method, a variety of excellent positioner slewing bearings can be produced. For customers in need, please consult online Customer service.

 

How to deal with the positioner slewing bearing if there is a problem

 

Positioner slewing bearing can accept large-scale bearings that summarize the load, and can also accept relatively large axial and radial loads. The slewing bearing is also called a rotating support. It is widely used in industry. It is the relative rotation movement between two objects. Following the continuous development of my country’s slewing ring, it is used in many occupations. How to deal with slewing bearing if there is a problem? The following is a detailed introduction for everyone.

 

If the positioner slewing ring is used for a long time, it will show such problems. This is the limit of accident quality. There are many reasons for such problems. If you do not pay attention to the lubrication, there is foreign matter intrusion. If you do not arrange it in time, it will continue for a long time. It will have a certain impact on the shaft and shell of the positioner slewing support, so special attention should be paid to it during use.

 

If the use of the positioner slewing bearing can not find the cause of the damage, it must be carefully checked during the application process, and the choice of lubricant needs to be selected according to the type, so that it can effectively prevent the surface bearing from showing damage. The slewing ring of the positioner damages the ribs of the roller bearings and simply presents jams, and the lack of lubricant will simply cause problems. If the error of the positioner slewing support device is relatively large, and the shaft deflection is too large, problems will also occur.

 

If there is a problem with the positioner slewing bearing, the cause of the problem must first be found out, and the correct method should be adopted in time to deal with it, so that the use of the bearing can be restored in the shortest time. The service life of other positioner slewing bearings has a certain limit, and it can extend its service life by choosing appropriate methods for maintenance. Therefore, pay attention to the choice of lubricating oil when using it, and avoid foreign matter from entering.

 

Analysis of the cause of abnormal noise in the use of positioner slewing bearing

 

In the daily use of positioner slewing bearings, we may encounter problems of one kind or another. For example, the positioner slewing bearing presents abnormal noise. Many people may think that the positioner slewing bearing itself is defective, but it is different. The reasons for the abnormal noise in the occasion are different. Let’s talk about what the abnormal noise of the positioner slewing ring is.

 

If the newly replaced positioner slewing ring shows abnormal noise during operation, it is a normal phenomenon, which is caused by the lack of lubricating oil. You only need to alter the lubrication on the newly replaced positioner slewing ring. Oil is fine. After the new positioner slewing bearing is installed, it is necessary to apply lubricant to the various parts of the positioner slewing ring first, and check the positioner slewing ring after 100 hours of operation of the positioner slewing ring, see Check whether the pre-tightening force of the above screws and bolts meet the requirements, and then check them after 500 hours of operation. At the same time, avoid the abnormal noise of the positioner slewing ring due to lack of oil in the new positioner slewing ring, so after 50-100 hours, the positioner slewing ring should be made up for a grease.

 

However, if a long-term positioner slewing ring is used, abnormal noise during operation is not a problem of lack of lubricating oil. It may be that a part of the positioner slewing ring is defective or damaged, so stop the positioner slewing Support operations are thoroughly inspected.

 

Therefore, the abnormal noise of different positioner slewing bearings has different reasons. The detailed treatment method should be based on the actual situation. However, no matter what the reason is, the abnormal noise of the positioner slewing ring must be stopped in time. The operation is inspected to avoid delaying the formation of an increase in damage.

How to install the turntable bearings?Introduction of installation process and requirements

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Turntable bearing is a kind of special structure of large bearings, able to bear a larger axial and radial load and tilting moment of load combined load has a compact structure convenient guide rotation installation is simple and easy to maintain, etc, are widely used in engineering machinery and mining machinery wind power port petrochemical light industrial robot aerospace vehicle radar medical devices and military industry and other industries of large rotary device but how many for wheel bearing installation, but is not very understanding, constant crown wheel bearing small make up just to tell you about today’s installation process

One.Disposal of a turntable bearing before installation

1.Rustproof and packing

The inner and outer surfaces of the turntable bearing are uniformly coated with both sides of the bearing anti-rust lubrication oil. The packaging is wrapped with plastic film kraft paper and linen strips.The outer surface of the bearings of large size turntable should be wound with plastic cloth.For small size turntable bearings packed in wooden cases

2.Transportation

Keep bearings horizontally as much as possible during transportation. Only slight tilting is allowed. Large collisions or vibrations should be avoided.After opening the package, lift the bearing to the installation position by turning the lifting bolt inside the lifting hole of the inner ring or outer ring

3.Storage

①Before use, do not open the package during the rust prevention period (within 12 months after the bearing leaves the factory). If maintenance is needed, anti-rust treatment should be carried out on the tooth surface of the outer raceway of the rotary disc bearing

②Place horizontally on a dry, flat surface

③Place horizontally on a dry, flat surface

④If multiple sets of turntable bearings are stacked together, at least three evenly distributed wooden pads should be placed between each set of turntable bearings along the circumference, and the upper and lower pads should be placed in the same position

Two.Install turntable bearings

1.Place internal and external factors correctly

Put the external cause flat on the work table, put it into the lower half and try to make the external raceway and the internal cause channel corresponding to the correct placement of rollers and isolation block. The selected cylindrical roller and circular isolation block are placed along the track. When placing the adjacent cylinder rolls, their axes are perpendicular to each other, and the two rollers are separated by an isolation block

2.Coated grease

Apply the appropriate grease lightly and evenly on the racetrack.Fill the gap between rolling and isolation block.The number of roller and isolation block is generally equal, and the cylinder dredge and isolation block should be close to each other. If there is a gap between roller and isolation block at one place, the thickness of one or two isolation blocks can be adjusted to make up the gap.

3.Mounting bolt

Turn the opposite assembly bolts 1-2 times in the diameter direction and turn the other integral ring at the same time to prevent the roller from getting stuck in an inappropriate position.Then twist the two symmetrical studs 180 apart, and so on, until all bolts are screwed to the specified torque value.When tightening bolts, ensure that the adjusting plate is in good position, and use a force wrench, so that the bolt can obtain the specified pretightening torque.

Three.Installation after inspection

After installation, if there are abnormal phenomena such as noise, impact and sudden increase of power, the machine should be stopped for disassembly and inspection.After running for about 100 hours, check the pretightening torque of the mounting bolts in the inner and outer rings, and check it every 500 hours after running.

When the bearing is disassembled and cleaned, the bearing assembly drawing shall be followed, and the upper and lower two halves of the ring shall be assembled according to the original drilling position.The tooth surface should be cleaned of debris every 10 days and lubricated。

Four.Installation requirements

1.Before the installation bolts are not completely tightened, the gear meshing inspection should be carried out to ensure the meshing clearance and meet the accuracy requirements of the gear.

2.Adjustable flat washer is optional when installing bolts. Spring washer is not allowed.

3.After radial positioning of the turntable bearing, cross tighten the mounting bolts and check the free rotation of the bearing.Sufficient preloading force shall be required when tightening bolts, which shall be 70% of the yield limit of bolt materials.
4.Before the installation bolts are not completely tightened, the gear meshing inspection should be carried out to ensure the meshing clearance and meet the accuracy requirements of the gear.
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What is the difference between single row ball slewing bearing domestic and overseas?

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Slewing bearing is very popular both in China and abroad, especially in Germany, France, the United States and Britain is a major manufacturer of slewing bearing of single Chinese slewing bearing single appeared in the early 20th century in the early 1980 s, using the German technology and combining with the domestic technology, formed the slewing bearing of single bearing technology, however, compared with abroad, is still a big gap between product quality and level of The following is a comparison of single ball slewing bearing from four aspects domestic and overseas

1.Design Technology

Foreign only need to input in the computer such as working conditions, installation size, speed and other data, such as CAD program automatically complete product structure design, loading capacity calculation, and the output of various shapes and curves at the same time, and using finite element analysis of slewing bearing load simulation analysis and single foreign company’s new products emerge in endlessly, at least a dozen, but in China is less than 10, so every year there are many special requirements,single row ball slewing bearing need to be imported from abroad

2. Technology
Slewing bearing manufacturer abroad single CNC machine tool has been widely used for processing and it has the advantage of greatly simplifies the process, reduce the frequency of the workpiece clamping, avoid the processing and the measurement error, greatly shorten the production cycle, and to ensure that the internal and external assembly, at the same time improve the quality of the product percent of pass due to the use of the nc machine tool, it provides conditions for the scene to realize the drawing operations from product contract to product design (CAD), process design (CAPP) and CNC machine design, the computer system can be connected to the whole operation process is very efficientAnother foreign manufacturer has many unique features for single volley type rotary bearings in heat treatment, roll rolling and other processes

3. Test technology
The design of the single ball slewing bearing is inspired by a large number of long-term experiments and practices, so the experimental equipment and methods have attracted wide attention.For this, lack of in-depth research and implementation, should gradually improve the life test, temperature test, bolt strength test, gear strength test equipment.

4. Quality control

There is still a large gap between domestic production plants and international standards.There are almost no full-time inspectors in foreign production workshops, but all kinds of inspection data are accurate and reliable, and transmitted timely.We do not have a lot of advanced testing equipment, such as nondestructive testing, coordinate measurement, so the domestic quality control level is low.

A single row ball slewing support is often referred to as the connecting part of a machine tool.This is an essential transport link for the machine.The macros of a single row ball slewing support are called supports.Support parts are commonly used as basic tools for CNC machines, including rocker arms and turret.And the bed, and the beam, and the elevator.

One of the supports is called the auxiliary support.Auxiliary supports certainly play a role in limiting the degree of freedom in increasing the stiffness of the workpiece.In fact, the two meanings play the same role: to achieve and improve machining accuracy and efficiency through machining, corresponding to the different installation methods of single volleyball slewing bearing. When constraints are applied, the inner ring can be all or all of the constraints.The constraint is applied to the outer surface of the outer ring

The Mises stress of the elliptical raceway is less than that of the circular raceway, that is to say, the bearing capacity of the single volleyball slewing bearing is better than that of the single volleyball raceway bearing.Single volleyball slewing supports, these components are relatively large in size, so they are also known as large single volleyball slewing supports, which can withstand the combined load of large bearings.The latter can withstand greater axial loads, radial loads and sloping turning moments.In order to ensure the normal and stable operation of the equipment, the large bearing is of closed construction, so that the true function of the bearing can only be seen when the top of the heavy structure is lifted to a certain height.

Slewing bearing maintenance is very important. What are the precautions?

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Bearings are used in many mechanical equipment. Among them, slewing bearings are widely used. Let’s say slewing bearings. When in use, maintenance is an important thing to do. Then we need to repaBearings are used in many mechanical equipment. Among them, slewing bearings are widely used. Let’s say slewing bearings. When in use, maintenance is an important thing to do. Then we need to repair and maintain slewing bearings. What should I pay attention to?

Slewing bearing maintenance and repair matters:
(1) The mounting support of the slewing ring must have sufficient rigidity and the mounting surface must be flat. Before assembling the slewing ring, the bearing should undergo stress relief, and the slewing bearing and slewing ring should be repaired and maintained to reduce the deformation of the slewing bearing. The contact surface between the support and the slewing ring must be cleaned up during assembly.
(2) When using slewing bearing and slewing ring, attention should be paid to changes in noise and slewing resistance torque. If there is any abnormal phenomenon in the maintenance of slewing bearing and slewing ring, it should be disassembled and inspected.
(3) The slewing bearing must be hoisted or stored horizontally, and do not hoist or store vertically to avoid deformation.
(4) Before the bolts are tightened, the slewing bearing and the slewing support should be checked for meshing of the gear. The meshing condition should meet the requirements of gear accuracy: that is, the contact spots distributed on the tooth surface after the gear pair runs under slight braking The height of the teeth is not less than 25%, and the length of the teeth is not less than 30%.
(5) The slewing bearing and slewing ring tooth surface work 10 shifts should be cleaned of secondary debris and re-coated with grease.
(6) Slewing bearing and slewing ring In order to ensure the reliability of bolt work and avoid the lack of bolt pre-tightening force, the slewing bearing and slewing ring should be checked for the pre-tightening torque of the bolts after 100 hours and 500 hours of operation. . After that, check the preload torque every 1000 hours of work.
(7) The bolts and nuts connecting the slewing ring are all high-strength bolts and nuts; double nuts are used for fastening and preventing loosening.
(8) When tightening nuts for slewing bearings and slewing rings, lubricate the threads and nut surfaces of the bolts, and use a torque wrench to tighten them symmetrically and evenly in the circumferential direction. When tightening later, the pre-tightening torque on each bolt should be roughly uniform.
(9) 4 oil cups are evenly distributed on the upper surface of the ring gear of the slewing ring that is aligned with the raceway, thereby adding grease to the raceway. In general, the slewing ring should be lubricated every 50 hours. You must add enough oil each time until the grease leaks out from the seal.
Only with frequent maintenance, the possibility of slewing ring damage will be reduced, and we will be more at ease when using it.
ir and maintain slewing bearings. What should I pay attention to?

 

Analysis and Solution of Inflexible Slewing Ring Operation

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The slewing bearing is called the joint of the machine. It is a common used bearing in modern machinery and equipment，which requires relative rotational movement between two objects and simultaneously bears axial force, radial force and tilting moment. With the rapid development of the machinery industry, slewing bearings have been widely used in marine equipment, engineering machinery, light industry machinery, metallurgical machinery, medical machinery, industrial machinery and other industries. However, Some slewing bearing is inflexible in operation or it is found that the slewing bearing will rotate inflexibly after being put into use for a period of time. Faced with such a problem, how should we deal with it? The following is an explanation of the reasons and solutions for the inflexible operation of the slewing ring.

  1. First, do the following investigations on abnormal phenomena
  2. Idling of newly purchased products is not flexible

Please check the production date of the slewing bearing. If it takes a long time, such as more than half a year, and the climate is cold, it is possible that the viscosity of the grease in the raceway may be too large and the operation will not work. It is more prominent in cold areas and winter.

Exclusion method: If it can be operated and there are no other abnormalities after adding force, it can be used normally; if it is accompanied by abnormal noise, check whether there is any serious trauma during transportation, and report the information to the manufacturer’s after-sales service department for processing.

2. Inflexible operation after installation
It may be because the mounting surface of the main machine and the mounting surface of the slewing ring are not well matched, the axial clearance of the slewing ring after installation cannot compensate for the deformation of the slewing ring. The slewing ring is in a state of negative clearance and the rolling elements are difficult to run in the raceway, sometimes accompanied by abnormal noise , Or poor meshing of the large and small gears, or foreign matter stuck in the large and small gears.
Solution: Re-process the installation plane to make the installation plane meet the requirements, or use the gasket filling method; re-adjust the meshing backlash of the large and small gears as required, especially pay attention to the position of the gear jump; check to ensure that there is no foreign matter in the meshing position of the large and small gears; Replace a slewing bearing with a slightly larger clearance.
2. Reasons for inflexible rotation during use
1. The slewing bearing lacks lubricating oil, and the lubricating grease causes increased friction and resistance, which will cause insensitive movement.
Solution: add the same specification lubricating oil or replace all the lubricating oil.
2. The sealing strip is damaged, causing foreign matter to enter the raceway, such as poor working conditions, dust intrusion into the raceway, etc.
Solution: Remove foreign objects in the raceway and replace the sealing strip.
3, the slewing ring gear is deformed or broken, causing jamming or inflexible movement.
Solution: repair the gear and re-weld the gear.
The above is the analysis of the reasons for the inflexible operation of the slewing ring and the solutions. If the slewing ring still cannot be rotated after taking the above measures, it may be a fault in the raceway, please contact the manufacturer in time for after-sales treatment. For more information about slewing ring bearings, please pay attention to this website, or contact us.

Effective utilization and adjustment of slewing bearing clearance

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Slewing bearings are mainly used in lifting, construction machinery and other large-scale engineering machinery and equipment. They mainly bear axial force and overturning moment. However, in many cases, overturning moment is the main load of the bearing. Under the action of the overturning moment, the angular deformation of the bearing will greatly affect the stiffness and working accuracy of the entire machine. Therefore, it is necessary to analyze the relationship between the moment load bearing and the deformation of the turntable bearing.

 

The role and requirement of bearing clearance is to ensure that the bearing can run flexibly and without hindrance, but it is also required to ensure that the bearing runs smoothly. According to the state of the bearing, the clearance can be divided into three general existence states: original clearance, installation clearance and working clearance.

 

The size of the clearance (called the working clearance) during operation has an impact on the performance of the slewing bearing and slewing ring, as well as the precise rolling fatigue life, temperature rise, noise, and vibration. When selecting the bearing clearance, it is generally appropriate to make the working clearance zero or slightly positive. Because it is actually installed in the machine, the slewing bearing has to bear a certain load to rotate, and there is also the amount of elastic deformation caused by the matching of the bearing and the load. And, considering the factors of thermal expansion (load), enough clearance is reserved, and proper installation clearance will help the normal operation of the rolling bearing. If the clearance is too small, the temperature of the rolling bearing will increase, and it will not work normally, and the rolling elements will be stuck; if the clearance is too large, the equipment will vibrate and the rolling bearing will be noisy.

The choice of working clearance is determined by the application conditions (load, speed, design parameters) and expected working conditions (lifetime, rigidity, low heat generation, ease of maintenance, etc.). However, in most applications, we cannot directly adjust the working clearance, which requires us to calculate the corresponding clearance value after installation based on the analysis and experience of the application.

 

1, the selection principle of bearing clearance

 

①With tighter fit, the temperature difference between the inner and outer rings is large, the friction torque needs to be reduced, and the deep groove ball bearing bears a larger axial direction

 

For load or occasions where the self-aligning performance needs to be improved, a large clearance group should be used.

 

②When the rotation accuracy is high or the axial displacement needs to be strictly limited, a small clearance group should be used.

 

2. Factors related to clearance: the fit of the inner ring of the bearing and the shaft; the fit of the outer ring of the bearing and the housing hole; the influence of temperature.

 

3. How to adjust the axial clearance

 

①Use the nut installed on the bearing housing to push the gland pressed on the outer ring of the bearing for adjustment.

 

②Adjust the thickness of the gasket between the bearing cap and the base to adjust.

 

Slewing bearing different structure, different advantages

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Single row/double row Ball Slew Ring Bearings
The single-row four-point contact ball slewing bearing is composed of two seat rings.
Designed for average axial forces and tilting moments as well as high radial forces
Compared with the single-row version, the double row bearing can support higher loads at the same diameter
Applications: Mechanical engineering, construction equipment, wind turbines and ship loading/unloading applications

Double-Axial Ball Slew Ring Bearing
Simple and robust design with sufficient clearance
When tilting moments quickly change their amount and location
Where the slewing ring is subjected quick and continuous load changes
Applications: Open pit mining machinery like bucket-wheel excavators

Three-Row Roller Slew Ring Bearing
Used in highly demanding conditions
High static and dynamic load-carrying capacities
Applications: Rolling mill equipment, heavy-duty cranes and tunnel boring machines, mining machineries, etc,

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Cross-Roller Slew Ring Bearing
Used to support high radial forces as well as average axial forces and tilting moment loads
Zero clearance and uniform bearing friction
Applications: Mechanical and plant engineering, medical device and antenna equipment

Combi Slew Ring Bearing
Used in conditions of high axial forces and relatively low tilting moment loads
Applications: Bulk handling and conveyance equipmen