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china without gear bearing(no gear)

1.Selection and Practical Application of Clearance of Precision Gear Bearings

The precision gear bearing can rotate smoothly to obtain an ideal runout value. Generally, when designing and manufacturing, the clearance value will choose small clearance, zero clearance, and negative clearance. The corresponding clearance value is generally 0 to 0.05. ≤0, -0.05 to -0.01, the corresponding preloads are: no preload, light preload, and heavy preload.

During processing, we can measure the channel size according to the method of measuring the channel size of the gear bearing, and calculate the clearance value (whether positive or negative) according to the measurement data, and then check the calculated clearance value after the processing is completed.

The positive clearance is directly measured with a dial indicator, and the negative clearance is used to measure the starting torque of the slewing bearing. According to the size of the starting torque, the size of the interference of the gear bearing is judged. The starting torque is also a must know in the use of the slewing bearing. A value of , which determines the selection of slewing bearing reducer and motor.

To measure the starting torque of the gear bearing, it is necessary to measure the starting force of the slewing bearing first, and a dynamometer is required. Since the maximum starting force occurs at the moment when the slewing bearing is about to rotate, a force measurement that can record the maximum value of the measurement is required. Gauge to measure the driving force of the gear bearing。

Starting torque=starting force x lever arm, the starting force can be measured with a dynamometer, we generally install a bolt on the outer ring hole of the slewing bearing, and use a dynamometer to measure the starting force of the slewing drive at the bolt, and the distribution of the bolt holes in the outer ring The radius of the circle is the arm, and the starting torque of the slewing bearing is calculated from the starting force and the arm.

For the same gear bearing, the difference in starting torque can reflect the size of the clearance value of the negative clearance slewing bearing. The larger the starting torque, the smaller the clearance value and the greater the preload.

gear bearing Alt.

The selection of the clearance value should also consider the situation of the customer’s equipment. The smaller the clearance value of the slewing bearing, the higher the requirements for installation and use.

Due to the small deformation, the small deformation of the gear bearing can be offset by the clearance when the clearance is large, and the slewing bearing can rotate normally after installation, but if it is a small or negative clearance, the slewing bearing has no extra clearance to resist the small deformation. If the slewing bearing is deformed, it will be stuck, rotated poorly, or even stuck, resulting in damage or failure to use.

Therefore, the selection of small clearance for precision gear bearings requires comprehensive analysis and evaluation of the accuracy of the slewing bearing, the machining accuracy of the equipment installation foundation, and the user’s specific operating conditions, and then selects the appropriate clearance value, which not only ensures the accuracy but also ensures that it can be installed and used on site.

2.How to improve the tooth machining efficiency of the gear bearing?

The slewing ring bearing is a large bearing that operates at low speed and heavy load. Usually the inner ring or outer ring has teeth. It is used to connect large components that require relative rotation. It is widely used in automated industrial machinery, construction machinery, wind power equipment, port machinery and other fields. ,

In the whole cycle of the slewing bearing from the forging to the finished product until it is sent to the user, the tooth processing process takes up a lot of time, and the length of the delivery time depends to a large extent on the processing efficiency of the slewing bearing teeth.

In recent years, due to the country’s strong investment in infrastructure, new energy equipment and other fields, the market demand for slewing ring bearings has also increased sharply, and the supply is often in short supply. On the other hand, there are many domestic manufacturers of slewing ring bearings. Minimizing costs on the premise of quality is the key for enterprises to stand out in the fierce market competition.

Gear machining is the longest time-consuming process in the production process of slewing bearings, and it has always been one of the most important factors restricting the production efficiency of slewing bearings. The traditional slewing bearing tooth machining usually has two methods: gear shaping and gear hobbing.

In order to adapt to the improvement of processing accuracy and production efficiency requirements, gear hobbing and gear shaping technology are constantly developing in the direction of full numerical control, high speed, high precision, and intelligence, but the processing efficiency has not yet reached the ideal state, especially the processing of internal teeth. Only the gear shaper can be used, the cutting amount of each feed is small, and the processing efficiency is low.

In recent years, a machining method of CNC high-speed tooth milling has been gradually promoted in the slewing bearing industry. There are two types of internal teeth and external teeth, which are processed by the profiling principle, with high processing efficiency and large feed amount.

It is suitable for large diameter, large Modular slewing bearing processing, especially internal gear processing, is 5-8 times more efficient than traditional gear shaping, which greatly shortens the production cycle of slewing bearings.

Gear milling, gear hobbing, and gear shaping have their own advantages and disadvantages in terms of processing efficiency and equipment cost. In the case of sufficient market demand, the efficiency of gear milling is better than that of gear hobbing and gear shaping, and the cost of gear milling is also lower than that of gear hobbing and gear shaping.

best bearing slewing ring manufacturers china

The importance of the mutual difference between the two channels of the double volleyball slewing ring bearing

Slewing ring bearings have unique bearing characteristics, and are usually used in hoisting machinery, excavators, turntables, wind turbines, and other equipment. Most of the slewing bearings below three meters have a four-point ball structure, and the size of the load determines the height of the slewing ring, Diameter and size of channel steel balls.

If a large-load slewing ring bearing is required but the diameter is limited, the bearing capacity of the slewing bearing can generally be improved by increasing the steel ball. If the bearing capacity is still not met by increasing the steel ball, the structure of the double-row ball slewing bearing can be adopted.

The slewing ring satisfies the limited outer diameter size, but also requires a large load, which not only saves materials, but also improves the performance of the slewing bearing, so that the slewing bearing has greater axial radial load and tipping moment.

The channels of slewing ring bearings are divided into plane channels and arc channels, among which the channels of four-point contact ball bearings and double-row ball bearings are typical arc channels; the channels of crossed roller and three-row roller bearings are is a typical planar channel.

In terms of processing technology, the processing difficulty of circular arc channels is greater than that of flat channels, so there are naturally higher requirements for precision level and parameter control of actual processing.

Especially for the double-row ball slewing bearing, the channel is two parallel arcs. In theory, the two rows of balls are subjected to force and run at the same time during the rotation process, but the probability of absolute simultaneous force and simultaneous operation is very low. exist on.

During the machining process, a certain error is allowed in the double-row ball channel. This error is not enough to affect the overall running state of the slewing ring.

This mutual difference is generally required to be within 0.03mm in the process. In order to achieve this goal, in the process of bearing grinding and matching, the machine tool needs to have good precision, and the workers need to have a skilled operation level.

If you want to achieve zero or negative double-ball clearance, the difference needs to be controlled within 0.01mm. Inside, for the double volleyball slewing ring, only by controlling the mutual difference between the channels can the slewing ring exert its theoretical bearing capacity and its characteristics.

slewing bearing Alt.

2.How to reduce slewing ring bearing tooth noise

The slewing ring bearing can stably support the equipment for slewing motion, also known as the turntable bearing. The mechanical equipment needs to be rotated without the transmission. The slewing bearing can be made of external teeth or internal teeth, and the rotation of the slewing bearing is realized through the gear transmission.

In practical applications, the force of the slewing bearing is different, the speed of rotation is also different, and the teeth of the slewing bearing are also different. In the process of gear transmission, the contact between the gear and the ring gear of the slewing ring will generate noise, so how to reduce the noise of the slewing ring?

1. Control the tooth precision. Through long-term practice, we found that if we want to reduce the tooth noise, the tooth precision needs to be controlled at 7-8 grades. The higher the rotational speed, the higher the gear tooth precision requirements. Gear, tooth accuracy should be controlled within 7 grades.

2. Reduce the frequency of start-stop or forward and reverse rotation of the gear. Frequent start-stop or forward and reverse rotation will cause the gear to vibrate too fast, and the vibration will generate noise. The faster the vibration, the louder the noise. Reduce noise.

3. Reduce the impact load. The impact load will make the vibration frequency and torsion direction of the gear different, which will cause vibration in the circumferential direction, which will form a smooth noise. Reducing the impact load can reduce the noise.

4. Reduce the occurrence of resonance, which will generate high-frequency noise. When the motor rotates at a low speed or at a certain speed, the equipment will resonate, causing the gear and ring gear to oscillate at a high frequency and the two oscillating objects will contact. High-frequency noise will be generated, which can generally be reduced by changing the speed or adjusting the position of the equipment.

5. Increase the roughness of the tooth surface. If the roughness of the tooth surface is very poor, it will cause point contact on the tooth surface, and noise will be generated when the high point contact is made. If the roughness of the tooth surface is increased, the tooth surface will be in line contact, and the noise will be very high. Small.

6. Increase the lubrication of the tooth surface. Insufficient lubrication will lead to increased friction, and noise will be generated when the tooth surface is rubbed. Sufficient lubrication can reduce friction and effectively reduce noise.

perfect bulk truck crane slewing bearing

1.Introduction to the basic knowledge of crane slewing bearing

What is the definition of crane slewing bearing?

Slewing bearing, also known as slewing bearing, is a mechanical force transmission basic element that needs to rotate relative to each other between two parts of various machines and simultaneously bear axial force, radial force and overturning moment.

The basic function of the crane slewing bearing is to transmit force and drive, and realize the relative rotation between the two parts of the mechanical equipment. The crane is usually an upper and lower structure in which the working device (turntable) and the chassis can rotate relative to each other, and its connection mechanism is naturally inseparable from the slewing bearing.

What are the types and main performance characteristics of slewing bearings?

1. Cross-roller slewing bearing: the main type of small and medium-sized slewing bearings in the 1980s and 1990s, due to the inherent defects of the structure type, the actual bearing capacity is far from the theoretical value, and has been completely replaced by single-row ball slewing bearings.

2) Single-row ball slewing bearing: with a row of steel balls as rolling elements, the steel balls are in contact with the raceway at four points, and can bear axial force, radial force and overturning moment at the same time, it is a small and medium-sized slewing bearing with a diameter of less than 2000mm Preferred product.

3) Double row reducing ball crane slewing bearing: the contact angle of the upper volleyball is 90 degrees, the three-piece structure, and the cross-sectional size is much larger than that of the single volleyball. , Universal double-row ball slewing bearing.

4) Three-row column slewing bearing: suitable for larger loads, it is the most cost-effective among crane slewing bearings with a diameter greater than 2000mm

5) Double-row 8-point contact ball slewing bearing: equivalent to the combination of two single-row balls, it is the first choice for the host requiring heavy load and limited radial structure size.

6) Ball-Roller combined crane slewing bearing: suitable for working occasions with large axial load and small overturning moment and radial load.

crane slewing bearing Alt.

2.What should be paid attention to when installing the crane slewing bearing？

(1) The tempering belt of the ring gear (at the outer mark “S”) and the place where the steel ball loading and unloading holes are blocked should be placed in the non-load area or light load area.

(2) The installation platform must be clean and flat, without iron filings, burrs or other debris, and its flatness should meet the regulations

(3) The mounting bracket must have sufficient rigidity to prevent the crane slewing bearing from being deformed due to insufficient rigidity of the bracket, resulting in the slewing bearing not working properly. Under the action of rated load, the support plane should meet the requirements of relevant standards.

(4) Note on gear installation: ensure that the central axes of the large and small gears are parallel. The pinion must be assembled from the mark of the highest point of the tooth jump of the large gear of the slewing bearing (the green mark), and the backlash between the gear and the pinion at this point should not be less than the specified value.

(5) Comply with the selection and installation requirements of bolts for crane slewing bearings.

low price robotics slewing bearings

1.Why do not use elastic washers for the mounting bolts of the slewing bearings?

The installation and operation manual of the slewing bearing tells you that elastic washers cannot be used when installing the connecting bolts of the slewing bearings, so what effect will the elastic washer have on the slewing bearing?

First, we must first understand the function of the elastic washer. The elastic washer has a certain elasticity, which can prevent the bolts and nuts from loosening and falling off during the use of the equipment. It is suitable for many mechanical equipment with vibration. However, the slewing bearing generally bears a large load, so the strength requirements of the bolts are relatively high.

Usually, grade 10.9 bolts and nuts are used. The high-strength bolt connection mainly relies on the frictional resistance between the bolt and the connected parts to achieve locking. Unlike ordinary bolts, which can be prevented from loosening by elastic washers, the use of thread tightening glue for the bolts of slewing bearings is the correct anti-loosening measure.

Second, the slewing bearings does not use elastic washers to prevent the deformation of the slewing bearing. The contact area of the elastic washer is not as large as that of the flat washer. Under the action of the large pre-tightening force, the flat washer is not reliable, and the larger pre-tightening force of the bolt may be It causes plastic deformation of the slewing bearing mounting surface in contact with the spring washer.

With the increase of use time, the deformation will become larger and larger, the pre-tightening force of the bolt will become smaller, and the bolt will loosen. The slewing bearing is usually subjected to overturning force.

The overturning force during operation will aggravate the plastic deformation of the slewing bearings mounting surface, and may also cause the elastic washer to open, resulting in rapid damage to the bolt and the slewing bearing.

Third, a suitable flat washer can increase the contact area between the bolt and the slewing bearing, preventing the plastic deformation of the contact surface of the slewing bearing when the bolt is pre-tightened by the workpiece with insufficient hardness. Due to the increase in the contact area during the use of the slewing bearing Bolted connections maintain high reliability under overturning forces and shock loads.

Slewing Bearings Alt.

2.What material is the seal on the slewing ring made of?

Sealing is a component that prevents fluid or solid particles from leaking between adjacent joint surfaces and prevents external impurities such as dust and moisture from invading the interior of the machine.

Most rubber seals are made by molding, such as various extrusion seals, rotary shaft lip seals, reciprocating lip seals, composite seals, film seals, bellows seals, etc. Seals, piston ring seals, coaxial seals (or slip ring combination seals), etc.

There are many kinds of rubber seals, such as: nitrile rubber seals, fluorine rubber seals, silicone rubber seals, etc. The most commonly used seals for slewing bearings are nitrile rubber seals, fluororubber seals can be used at high temperatures, and silicone rubber seals can be used at low temperatures.

Nitrile rubber seal is a copolymer of acrylonitrile and butadiene monomers. It is mainly produced by low temperature emulsion polymerization. It has excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. , so it is especially suitable for slewing bearings.

The normal operating temperature of nitrile rubber seals is -50℃~100℃, which can meet most working conditions and environments. Nitrile rubber is one of the most representative rubbers with comprehensive properties such as oil resistance, physical and mechanical properties and chemical resistance. First, the effective use of these characteristics can meet the use of various occasions.

The high temperature resistance of fluororubber seals is very good, which can be said to be the best among the current elastomers. 26-41 fluororubber can be used for a long time at 250℃. Fluoroelastomer has excellent heat resistance, oxidation resistance, oil resistance, corrosion resistance and atmospheric aging resistance.

It has been widely used in aerospace, aviation, automobile, petroleum and household appliances and other fields, and is an irreplaceable key material in the advanced defense industry.

Silicone rubber seals can generally be used at low temperatures from -70°C to -50°C, and special formulations can be used at -100°C. They have the characteristics of anti-oxidation, shock-proof, moisture-proof, low-temperature resistance, ablation resistance, and radiation resistance.

It is one of the important materials for aerospace and cutting-edge technology. It can be used for cold-resistant rubber and sealing parts of ablation-resistant and heat-resistant aging parts in the aviation industry.

china cheapest four point contact ball slewing bearing supplier in 2022

1.What material are the parts of the four point contact ball slewing bearing？

The four point contact ball slewing bearing consists of inner ring, outer ring, rolling elements, seals, retainers, oil nozzles and other components. What we usually see are finished slewing bearings. What materials are used for the various parts of the slewing bearing What are the characteristics?

four point contact ball slewing bearing Alt.

1. The inner ring and outer ring of the four point contact ball slewing bearing are made of surface-hardened steel. When the user has no special requirements, 50Mn steel or 42CrMo steel is generally used.

According to customer requirements, normalizing or quenching and tempering is usually performed to improve the mechanical properties of the forgings, but sometimes In order to meet the needs of special applications, other materials can also be selected according to the specific requirements of users, such as aluminum, stainless steel, etc.

2. The rolling elements refer to the steel balls and rollers. The rolling elements of the slewing bearing are generally made of high-carbon chromium bearing steel, the grade is GCr15, and the overall quenching is used to achieve higher hardness.

3. The sealing material, the slewing bearing seal is generally made of oil-resistant nitrile-butadiene rubber NBR, which is suitable for most use environments. According to different operating temperatures, low-temperature-resistant low-temperature silicone rubber seals and high-temperature-resistant fluororubber seals can also be selected.

4. Cage material, the cage of the four point contact ball slewing bearing has a variety of structural types and materials, and the appropriate cage is selected according to the specific use conditions.

The integral and segmented cages are made of No. 20 steel and No. 45 steel or ZL102 cast aluminum alloy, brass, nylon and other materials; the isolation block type is made of polyamide 1010 resin, nylon, brass, etc.

5. Grease nozzles are generally made of brass and stainless steel.

The four point contact ball slewing bearing selects different parts and materials according to different working conditions. The general principle is to ensure that the slewing bearing is suitable first, and can meet the requirements of users in all aspects. On the premise of ensuring the application, try to choose common materials to reduce costs. , Save money for customers and make cost-effective slewing bearings.

2.What problems will affect the service life of the four point contact ball slewing bearing?

Four point contact ball slewing bearing is an important core component of equipment rotation. If the slewing bearing fails during the operation of the equipment and cannot rotate normally, it will cause equipment downtime and production paralysis.

It is generally very troublesome to replace the slewing bearing, so everyone generally chooses a slewing bearing with reliable quality. The bearing is installed on its own equipment. After the slewing bearing is installed, everyone hopes that the slewing bearing can work stably and reliably, and the longer the service life, the better. What are the factors that affect the life of the slewing bearing?

1. The problem of the equipment itself

1. The rigidity of the equipment installation foundation is insufficient. When the four point contact ball slewing bearing is running under heavy load, the rigidity of the equipment installation foundation cannot provide a good support for the slewing bearing, resulting in elastic deformation of the slewing bearing, uneven force when the slewing bearing rotates, and long-term use. It will cause damage to the slewing bearing and affect the service life.

2. The flatness of the installation foundation is not good. There will be a gap between the slewing bearing and the installation foundation during installation. The correct way is to use a gasket with a suitable height to level the gap, but the operator often ignores this during installation and use. ,

In this case, the slewing bearing will warp and deform after the bolt is pressed, causing the channel to be deformed. After the deformation, the channel and the steel ball are not in good contact, and the clearance value is not uniform and the rotation is inflexible, which affects the use of the slewing bearing. life.

2. Overload operation

When the slewing bearing is designed, the bearing capacity has been clarified, such as how much load and how much overturning moment it can bear. If the actual load exceeds the bearing capacity of the slewing bearing during use, it belongs to overload operation. During overload operation, the load on the steel ball exceeds the limit load, and there will be collapse blocks, fatigue spalling, and craters in the raceway.

The collapse will cause serious damage to the slewing bearing. It is possible that a short-term overload operation will cause devastating damage to the slewing bearing, which will seriously affect the service life of the slewing bearing, and overload operation may easily lead to safety accidents.

3. Pollution

Pollution can also lead to premature damage of the slewing bearing. Pollution means that dust particles, water, etc. enter the bearing raceway, or foreign matter enters the tooth meshing of the slewing bearing. Damage to the slewing bearing, contaminants will also cause the slewing bearing to corrode, resulting in the deterioration of the grease, which will shorten the life of the slewing bearing.

4. Lubrication

The lubrication system can reduce the friction coefficient when the four point contact ball slewing bearing is running, achieve very small rolling friction or sliding friction, and also prevent the four point contact ball slewing bearing from rusting. Damaged teeth and lack of long-term lubrication are one of the main causes of premature failure of slewing ring bearings.

high speed ball slewing ring bearing in stock

1.Ball Slewing Ring Bearing Installation:

When you get CXB bearing, please mount ball slewing ring bearing as instructions below:

(1)Require the installation surface has sufficient strength and rigidity.

(2)Clean bearing and surface of the components, each surface can not have corrosion.

(3)The mounting surface should have locating pin or locating mouth, to prevent the bearing ran to each other.

(4)After contact with the mounting surface, you should check fit clearance with a feeler, the gap can be filled with plastic or a padded to prevent deformation of the bolt tightening.

(5)When installing, ensure that the bearing quenching soft belt should be located in the non-load bearing area or not often load area or load minimum area.

(6)Bearing mounting bolts must be of high strength bolts, according to the loading conditions, select the appropriate intensity level.

(7)Installation washer should adopt flat washer to ensure bearing pre load uniformly.

(8)Bolt preload requires sufficient strength, the preload force is 0.7 times to the bolt material yield limit. Best installed using a torque wrench to ensure uniform force and improve quality of the installation.

(9)Tighten bolts should adopt a “star” cross or symmetrical diagonal tightening way, first pretension and then follow the strength requirements and tighten the bolts.Tighten the bolts needs a torque wrench .

(10)For toothed products,must do the gear backlash detection before tighten the mounting bolts. To ensure the minimum or maximum diameter (with logo) of the gear ring beating meet the design requirements (available 0.05 ~ 0.3mm feeler gauge calibration) .
ball slewing ring bearing Alt.

2.Ball slewing ring bearing installation related parameters requirements

(1)Mounting surface roughness is less than Ra12.5.

(2)The maximum allowable values of the installation surface flatness can be determined according to actual working condition, but the flatness change must be uniform increasing or decreasing, within the scope of the circumference of a circle, not allowed to appear more than two (including two) peak, and 100 mm face runout is not allowed within the scope of more than 0.015 mm

(3)Maximum value on the radial direction inclination of the mounting surface is 0.04mm .

(4)Prestressing force of bolt installation must be determined according to the strength level of the bolt,the pre load force is 0.7 times to the bolt material yield limit.

requirements of ball slewing rings bearing

Structures with slewing bearings normally require design types which are able to transmit all occurring loads with one bearing. These are normally axial, radial and tilting moments.These bearings must furthermore be suited to withstand the complete spectrum of operating conditions, as for example

• High and low temperatures including temperature fluctuations

• Overpressures and negative pressures

• Deformations of the companion structure

• Weight limits

• Limitation of the frictional torque

• Low maintenance

• Corrosion resistance

• Magnetoresistive behaviour

• Open center to run through supply lines or as access opening

Design and dimensioning
The bearings are individually designed and dimensioned for every application, this means that the buyer is not required to customize to specified geometries of catalogue bearings and characteristics but the bearing can be designed according to the customer’s structure and the specification.

Heat Treatment of Ball Slewing Ring Bearing Steel

Heat treatment of Ball slewing ring bearing steel is to put solid metal or alloy into certain medium then undergoes three process: heating, heat preservation, and cooling to change steel organization and get required performance.

Different from other processing technology (such as forging, casting, welding, machining), purpose of heat treatment is not to change shape and dimension of steel but to change internal organization and performance of steel.

Heat treatment is alternately and repeatedly used among cold working, hot working, and other manufacturing process of mechanical parts or dies. According to its application, Heat treatment usually divided into pre-heat-treatment and final heat-treatment, and location of processing line as bellow :forging/casting→pre heat treatment→machinery (rough) processing →final heat treatment→mechanical (fine) processing.

Final heat treatment, such as quenching+tempering, etc, known as the heat treatment that enables the workpiece to meet the performance requirements under use condition. Pre heat treatment, such as annealing, normalization, known as the heat treatment that eliminates defects caused by former process or get organization and ready for subsequent machining and final heat treatment.

The correct storage method for ball slewing ring bearing

Ball slewing rings bearing are coated with anti-rust oil , and wrapped with a film in the factory. Such a package is usually valid for 3-6 months antirust.As long as the relative humidity does not exceed 60% of the storage compartment , the temperature changes within(20 ± 10),ball slewing ring bearing general can store about a year (in the original packaging in good condition ) .

After long-term storage , grease lubricating properties of slewing bearings’ raceway filled may reduce.Before using the slewing bearing,they need to be filled with a new grease filling, storeroom should also avoid vibration and shaking.

For slewing rings ( turntable bearings ) not stored in their original packagings they should be kept well, to protect against corrosion and contamination .

For large slewing rings should be on flat, and inner and outer rings both should be supported. It should be stacked flat isolation between slewing rings.

low price harmonic reducer bearing

1.Harmonic Reducer Bearing

Harmonic reducer bearing is a professional supporting bearing for harmonic reducer. The bearing of the harmonic reducer is mainly composed of two surfaces. The harmonic reducer is equipped with crossed roller bearings, which are divided into two categories: outer ring split, inner ring integral (BCSF/BCSG series) and outer ring and inner ring integral (BSHF/BSHG series) according to their application occasions.

The rolling elements are cylindrical rollers, which are arranged in the V-shaped raceway vertically at 90° to each other. This structure enables a single bearing to bear loads in all directions such as axial load, radial load and overturning moment at the same time. Mounting holes are convenient for customers to install directly, and are suitable for various types of harmonic reducers.

Harmonic reducers are divided into two categories: outer ring split, inner ring integral (BCSF/BCSG series) and outer ring and inner ring integral (BSHF/BSHG series) according to their application occasions. The rolling elements are cylindrical rollers, which are arranged in the V-shaped raceway vertically at 90° to each other.

This structure enables a single bearing to bear loads in all directions such as axial load, radial load and overturning moment at the same time. Mounting holes are convenient for customers to install directly, and are suitable for various types of harmonic reducers.

Harmonic reducer bearing Alt.

2.Main features and classification of harmonic reducer bearings

Harmonic drive is a very special power transmission mode, which has the incomparable advantages of general transmission modes. It has many advantages such as large transmission ratio, high precision, large bearing capacity, high transmission efficiency, small size and light weight.

It is widely used in space technology, electronic industry, military industry, robots, packaging machinery, printing machinery, CNC machine tools, medical equipment and other fields, and has a very wide application space. We generally call it a harmonic reducer or a harmonic reducer, and the output bearing used in the harmonic reducer is a crossed roller bearing, which we call a harmonic reducer bearing.

The harmonic reducer is mainly composed of three parts, namely the rigid wheel, the flexible wheel and the wave generator, but there are other parts besides the support transmission bearing. The bearing type required for the entire harmonic reducer component is deep groove ball Bearings, thin-walled flexible bearings and non-standard crossed roller bearings, the specific structure is shown in the following figure:

After decades of development at home and abroad, the development of harmonic reducers is also changing with each passing day, and the harmonic drive technology is becoming more and more mature. In recent years, it has also developed rapidly in China.

The crossed roller bearing for harmonic drive is a non-standard structure. It is very different from the ordinary crossed roller bearing in appearance and structure. There are many mounting holes on the inner and outer rings, especially the inner ring. There are three layers of threaded holes with different sizes and numbers, which is the biggest difference from the basic type crossed roller bearing in appearance.

The material is GCr15 bearing steel, but the outer ring heat treatment adopts the overall quenching process, while the inner ring adopts the raceway surface quenching process, which is the difference compared with the standard type cross roller bearing heat treatment process.

Crossed roller bearings for harmonic reducers have the following main features:

*High load carrying capacity design

*High rigidity

*Dimensions and rotation accuracy are higher than international standards

* Bear the load in any direction at the same time

*The smoothness of rotation is good

*Small and small space is easy to be compact and compact

*Easy to install and adjust

*Various bearing types and sizes for best choice

*Customized designs can be provided

According to the above characteristics and the different structural types of the harmonic reducer, the harmonic reducer bearing is also divided into different structural types, specifically:

CSF series harmonic reducer crossed roller bearing (standard type)

CSG series harmonic reducer crossed roller bearing (high rigidity type)

CSD series harmonic reducer crossed roller bearing (thin section type)

SHF series harmonic reducer crossed roller bearing (standard type)

SHG series harmonic reducer crossed roller bearing (high rigidity type)

SHD series harmonic reducer crossed roller bearing (thin section type)

Compared with similar imported harmonic reducers, domestic harmonic reducers still have a great disadvantage in quality, but with the continuous improvement of my country’s harmonic reducer manufacturing technology, the quality of domestic harmonic reducers will continue to improve.

It is guaranteed and has advantages in price, and it has strong competitiveness in the domestic market. The localization of harmonic reducer bearings and harmonic reducers continues to advance, thereby changing the unfavorable market situation of these high-precision robot reducer products that have been monopolized by foreign companies for a long time and are urgently needed in the domestic market.

With the continuous development and progress of a number of domestic harmonic reducer manufacturing enterprises, the competitiveness of my country’s harmonic reducer and supporting bearings in the international market has become stronger and stronger.

China is actively promoting the development of the industrial robot industry, and the demand for high-precision robot harmonic reducers has further increased, which requires domestic harmonic reducer enterprises and harmonic reducer supporting bearing manufacturers to support each other and continuously improve the manufacturing level , accelerate the transformation and upgrading of the harmonic reducer and bearing industry, narrow the quality gap with imported precision reducers, and realize the comprehensive localization of all supporting key components of domestic industrial robots.

in stock slewing bearings suppliers

1.The difference between straight tooth slewing bearing and helical tooth slewing bearing

Slewing bearing, also known as slewing bearing, is a supporting and rotating component widely used in various types of mechanical equipment. Due to the transmission requirements, slewing bearings usually have teeth. The common ones are straight teeth and helical teeth. The most intuitive difference between straight teeth and helical teeth is that the shape of the gear is different. In addition, there are differences in load and noise.

1. Appearance

Gears with straight teeth are arranged in a straight line on the ring gear, while helical teeth are evenly distributed on the ring gear at an inclined angle.

2. Accuracy

The helical gear drive is easier to obtain high accuracy than the straight gear drive, and the helical gear accuracy is maintained for a longer time.

3. Noise

Due to the design, manufacture, structure and other reasons, the noise generated by the straight tooth itself is larger than that of the helical tooth drive. Because the straight tooth is in direct contact, the gears will vibrate when they are engaged. The occlusion of the helical teeth is gradually contacted and gradually separated, so the transmission of the helical teeth will be relatively stable and the vibration will be relatively small.

4. Efficiency

In terms of transmission efficiency, the transmission efficiency of straight teeth is higher than that of helical teeth, because helical teeth will generate axial component force during transmission, and will lose part of the input torque. Straight teeth do not have this problem, and the transmission efficiency is as high as 95%.

5. Meshing line

In the case of the same module and the same tooth height, the meshing line of the helical teeth is longer than that of the straight teeth when the gears are engaged. Torque will be higher. However, the meshing line of straight teeth is relatively short when occluding, the collision force of the teeth is relatively direct, the force range is shorter than that of helical teeth, and the torque it bears will also be smaller.

slewing bearing Alt.

2.How to reduce slewing bearing tooth noise

The slewing bearing can stably support the equipment for slewing motion, also known as the turntable bearing. The mechanical equipment needs to be rotated without the transmission. The slewing bearing can be made of external teeth or internal teeth, and the slewing bearing can be rotated through the gear transmission.

3. Reduce the impact load. The impact load will make the vibration frequency and torsion direction of the gear different, and will form vibration in the circumferential direction, which will form a smooth noise. Reducing the impact load can reduce the noise.

4. Reduce the occurrence of resonance, which will generate high-frequency noise. When the motor rotates at a low speed or at a certain speed, the equipment will resonate, causing the gear and ring gear to oscillate at a high frequency and the two oscillating objects will contact. High-frequency noise will be produced, which can generally be reduced by changing the speed or adjusting the position of the device.

6. Increase the lubrication of the tooth surface. Insufficient lubrication will cause the friction force to increase, and noise will be generated when the tooth surface rubs. Sufficient lubrication can reduce friction and effectively reduce noise.

selling popular three-row cylindrical rollers slewing ring bearings made in china

How to choose the roller length of the three-row cylindrical rollers slewing ring bearing?

Slewing bearing, also called slewing bearing, plays an important role as a transmission component in many mechanical equipment. Among them, three-row cylindrical rollers slewing ring bearings are suitable for occasions with large axial load, radial load and large overturning moment. For example, in some large construction machinery and equipment, three-row cylindrical rollers slewing ring bearings are usually selected.

three-row cylindrical rollers slewing ring bearings Alt.

The three-row cylindrical rollers slewing ring bearings designed by LYMC company has many standard models. If the standard model cannot meet the load requirements, a non-standard design is required, that is, the load of the slewing bearing can be increased by increasing the diameter of the rollers. Load on a single roller.

The super-large diameter three-row cylindrical rollers slewing ring bearings can increase the load by lengthening the length of the roller. The length of the contact between the roller and the raceway increases after the length of the roller, and the load of the roller naturally increases.

But everything has advantages and disadvantages. The extended roller can be used on large-diameter slewing bearings, but it is not suitable for small-diameter slewing bearings. The channel of the three-row roller slewing bearing is a straight-line plane raceway.

On the small-diameter circular plane raceway, the linear velocity of the two ends of the long rollers is quite different. The rolling of the child in the raceway is not normal rolling. In the case of sufficient lubrication, it is rotating and creeping. However, if there is no restraint of the cage, the rollers will run horizontally and tilt in the channel, which will seriously affect the use.

In order to reduce the rolling of the rollers in the raceway, a long roller can be divided into two sections, and the extra long rollers can also be divided into three sections, and the flat rollers can be arranged in two or three rows side by side with an integral or segmented cage. , so as to avoid the linear velocity difference being too large and the rollers from creeping seriously.

When we need to increase the load of the three-row cylindrical rollers slewing ring bearings by increasing the diameter of the rollers or the length of the rollers, we need to choose according to the actual situation.

If you have any problems in this aspect during the selection and design, you are welcome to consult LYMC, our engineers will provide you with professional solutions, optimize the design, increase the stability of the slewing bearing, and improve the service life of the slewing bearing.

china light series four point contact ball slewing bearing manufacturer

How can we increase the service life of the four point contact ball slewing bearing?

A well-designed slewing bearing can greatly increase the service life of the four point contact ball slewing bearing, as long as it is properly operated and used, whether it is installation, use or subsequent maintenance.

Installation of four point contact ball slewing bearing：

Regarding the installation of the four point contact ball slewing bearing, first of all, the stop should be in place, the installation holes should be aligned, and the bolts should be pre-tightened first, and then tightened according to the diagonal method with reference to the tightening torque of different bolts.

In fact, there are two main points to pay attention to the installation of the slewing bearing, the first is the installation platform, and the second is the installation method.

The installation platform of the four point contact ball slewing bearing must first have sufficient strength support, and secondly, it must have sufficient flatness. Many people have no problem with the strength of the bearing, but often ignore the flatness of the installation surface.

The general accuracy of the slewing bearing produced by Fuji Transmission Higher, the requirements for the flatness of the mounting surface are also higher.

If the flatness of the mounting surface is greater than the parallelism of the four point contact ball slewing bearing, when the bolts are tightened, the accuracy of the slewing bearing will be lost, and the slewing bearing will be deformed, and the grooves will be deformed.

The dislocation of the slewing bearing reduces the service life of the slewing bearing, and the installation platform of the slewing bearing is generally machined.

point contact ball slewing bearing Alt.

When installing the slewing bearing, check the flatness. For defective positions, you can use the method of adding gaskets. The bonding surface of the slewing bearing and the installation platform should be clean and free of particles and other debris.

The slewing bearing has the position of the soft belt when it leaves the factory, which is generally marked as S. The plug is always the position of the soft belt. When installing the slewing bearing, special attention should be paid to the position of the soft belt. The position of the soft belt should be adjusted to the non-load area or not often.

In the load area, the soft belt area of the inner ring and the outer ring of the four point contact ball slewing bearing should be staggered by 180°. When installing slewing bearings on some lifting equipment such as truck cranes, cranes and tower cranes, the position of the soft belt should be installed at 90° to the boom.

Use and maintenance of four point contact ball slewing bearing:

In the use of the slewing bearing, be sure to refer to the installation manual and maintenance manual issued by the manufacturer for guidance. The sealing strips, rolling elements, and grease should be replaced in time according to different working conditions.

The slewing bearing is filled with 70% grease in the channel when it leaves the factory, which can be used by users for a period of time. When adding grease again, pay attention to cleaning up the residual grease and fill it with the grease brand and model recommended by the manufacturer. , Note that the grease must not be mixed, and the grease of the same brand and model is the best.

For slewing bearings with teeth, the grease on the teeth should be replaced and cleaned in time to ensure that the tooth surfaces are clean and free of particles and other debris, so as to avoid damage to the tooth surfaces when the teeth mesh for a long time.

When replacing the slewing bearing rolling element, retainer, and sealing, the four point contact ball slewing bearing needs to be disassembled and assembled.

When the slewing bearing is placed, it must be lifted and stored horizontally, and vertical lifting and storage are prohibited. During use, pay attention to the operation of the slewing bearing. If noise, impact, jitter, and shaking are found, the operation should be stopped in time, the fault should be eliminated, and the manufacturer should be contacted to provide technical support if necessary.

The installation of the slewing bearing is very important. The correct installation method can greatly increase the life of the slewing bearing and make the later maintenance and maintenance more convenient and labor-saving. Regular maintenance of the slewing bearing, replacement of wearing parts, protection of the channel, and protection of the tooth surface can also effectively extend the life of the slewing bearing.

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