user02, Author at Slewing Ring Bearings Manufacturers Suppliers Exporters

Four-point Contact Ball Slewing Bearing

1.Reasons and solutions for abnormal noise of excavator slewing bearing

In construction, excavators often appear. Not only is its crawler not afraid of some potholes, but also because the excavator can turn left and right, it is very convenient to dig holes and fill soil, but with long-term use, There will be various problems in the slewing bearing of the excavator, most of which are various abnormal noises.

slewing bearing Alt.

1. The installation surface is uneven, and the installed screws are loose

When abnormal noise occurs, it is necessary to first determine whether the installation is not flat enough to meet the requirements of the machine, so that there is a gap in the raceway, which leads to abnormal noise;

in addition, when the pinion engagement process is not tight enough In addition, when the bolts fixing the slewing bearing are loose, it will also cause the elastic deformation of the slewing ring bearing to produce a gap. At this time, it is necessary to check immediately and tighten the bolts as required. .

2. There is a foreign body inside the slewing bearing

When the inside of the slewing ring bearing enters foreign objects such as gravel and iron foam, there will not only be a strange vibration sound at this time, but also the problem of jamming in the direction of rotation.

Therefore, if we want to avoid this from happening, we not only have to clean the bearings and matching parts before installation, but also remember to remove foreign matter in the lubricant in time; in addition, do not use impure materials to keep the frame, so that we can remove the corresponding abnormal noise.

3. Abnormal noise caused by grease problem

The slewing bearing of the excavator needs to be lubricated with grease, so the abnormal noise may also be caused by the lubrication problem. Among the more common reasons, there are problems such as lack of grease, uneven filling of grease, poor quality of grease, aging and wrong selection of lubricants.

Therefore, as long as we use suitable lubricants, fill in and replace new lubricants in time, we can avoid such abnormal noises.

4. Abnormal noise caused by damaged sealing strip

The structure of the sealing strip of the slewing bearing plays a key role in the sealing performance, so it is necessary to frequently check whether there is wear around the sealing strip, because when the sealing strip and the slewing bearing are not tightly fitted, it will cause grease.

The certificate leaks to the outside, resulting in abnormal noise. In addition, the aging resistance and butter resistance of the sealing strip material are also issues that we need to fully consider.

5. Abnormal noise caused by cracks, indentations or rust

If cracks, indentations or rust appear on the rolling surface of the slewing bearing, it will cause vibration of the slewing ring bearing, which in turn will cause noise. However, this noise will vary indefinitely with the installation and grease. Therefore, we must not knock the bearing or use high-viscosity grease during installation.

6. The raceway and rolling elements are severely worn

The reason for the abnormal noise in the slewing ring bearing of the excavator may also be due to the long-term use of the slewing ring bearing, the raceway and rolling elements have reached the service life, and severe wear has occurred, then the slewing bearing must be carried out at this time. Repaired.

High Precision Bearing Accuracy

1.Bearing Accuracy

Bearing accuracy in accordance with GB/T307-94> national standards can be divided into GEDC B.. These tolerances and ISO, JIS and other standards for comparison are as follows:

STD	ACCURACY
GB/T307-94	B	C	D	E	G
ISO	CLASS2	CALSS4	CLASS5	CLASS6	NORMAL CLASS
DIN	P2	P4	P5	P6	P0
ANSI	ABEC9	ABEC7	ABEC5	ABEC3	ABEC1
JIS	JIS2	JIS4	JIS5	JIS6	JIS0

G grade/ABEC1 grade
inner ring	unit： um

bearing accuracy Alt.

d		^dmp		Vdp			Vdmp	Kia	^Bs		VBs
d				Diameter series
mm				9	0,1	2,3,4
exceed	to	max	min	max			max	max	max	min	max
0.6	2.5	0	-8	10	8	6	6	10	0	-40	12
2.5	10	0	-8	10	8	6	6	10	0	-120	15
10	18	0	-8	10	8	6	6	10	0	-120	20

18	30	0	-10	13	10	8	8	13	0	-120	20
30	50	0	-12	15	12	9	9	15	0	-120	20
50	80	0	-15	19	19	11	11	20	0	-150	25

inner

unit： um

D		^Dmp		VDp				VDmp	Kea	^Cs		VCs
D				open bearing			closed bearing
mm				open bearing			closed bearing
				diameter series
				9	0,1	2,3,4	2,3,4
exceed	to	max	min	max				max	max	max	min	max
2.5	6	0	-8	10	8	6	10	6	15	the same to inner ring
6	18	0	-8	10	8	6	10	6	15
18	30	0	-9	12	9	7	12	7	15


30	50	0	-11	14	11	8	16	8	20
50	80	0	-13	16	13	10	20	10	25
80	120	0	-15	19	19	11	26	11	35
120	150	0	-18	23	23	14	30	14	40

E grade/ABEC3 grade
inner ring	unit： um

d		^dmp		Vdp			Vdmp	Kia	^Bs		VBs
d				Diameter series
mm				9	0,1	2,3,4
exceed	to	max	min	max			max	max	max	min	max
0.6	2.5	0	-7	9	7	5	5	5	0	-40	12
2.5	10	0	-7	9	7	5	5	6	0	-120	15
10	18	0	-7	9	7	5	5	7	0	-120	20

18	30	0	-8	10	8	6	6	8	0	-120	20
30	50	0	-10	13	10	8	8	10	0	-120	20
50	80	0	-12	15	15	9	9	10	0	-150	25

inner ring

unit： um

D		^Dmp		VDp2)				VDmp4)	Kea	^Cs		VCs
D				open bearing			closed bearing
mm				open bearing			closed bearing
				Diameter series
				9	0,1	2,3,4	0,1,2,3,4
exceed	to	max	min	max				max	max	max	min	max
2.5	6	0	-7	9	7	5	9	5	8	the same with inner ring
6	18	0	-7	9	7	5	9	5	8
18	30	0	-8	10	8	6	10	6	9

30	50	0	-9	11	9	7	13	7	10
50	80	0	-11	14	11	8	16	8	13
80	120	0	-13	16	16	10	20	10	18
120	150	0	-15	19	19	11	25	11	20

D grade/ABEC5 grade
inner ring	unit： um

d		^dmp		Vdp		Vdmp	Kia	Sd	Sia	^Bs		VBs
d				Diameter series
mm				Diameter series
mm				9	0,1,2,3,4
exceed	to	max	min	max		3	max	max	max	max	min	max
0.6	2.5	0	-5	5	4	3	4	7	7	0	-40	5
2.5	10	0	-5	5	4	3	4	7	7	0	-40	5
10	18	0	-5	5	4	3	4	7	7	0	-80	5

18	30	0	-6	6	5	3	4	8	8	0	-120	5
30	50	0	-8	8	6	4	5	8	8	0	-120	5
50	80	0	-9	9	7	5	5	8	8	0	-150	6

inner ring

unit： um

D		^Dmp		VDp		VDmp	Kea	SD	Sea	^Cs		VCs
D				Diameter series				SD1
mm				9	0,1,2,3,4			SD1
exceed	to	max	min	max		max	max	max	max	max	min	max
2.5	6	0	-5	5	4	3	5	8	8	the same with inner ring		5
6	18	0	-5	5	4	3	5	8	8			5
18	30	0	-6	6	5	3	6	8	8			5

30	50	0	-7	7	5	4	7	8	8			5
50	80	0	-9	9	7	5	8	8	10			6
80	120	0	-10	10	8	5	10	9	11			8
120	150	0	-11	11	8	6	11	10	13			8

B grade/ABEC7 grade
inner ring	unit： um

d		^dmp		^ds		Vdp		Vdmp	Kia	Sd	Sia	^Bs		VBs
d						Diameter series
mm						7,8,9	1,7,2,3,4
exceed	to	max	min	max	min	max		max	max	max	max	max	min	max
0.6	2.5	0	-4	0	-4	4	3	2	2.5	3	3	0	-40	2.5
2.5	10	0	-4	0	-4	4	3	2	2.5	3	3	0	-40	2.5
10	18	0	-4	0	-4	4	3	2	2.5	3	3	0	-80	2.5

18	30	0	-5	0	-5	5	4	2.5	3	4	4	0	-120	2.5
30	50	0	-6	0	-6	6	4	3	4	4	4	0	-120	3
50	80	0	-7	0	-7	7	5	3.5	4	5	5	0	-150	4

inner ring

unit： um

d		^Dmp		^Ds		Vdp		VDmp	Kia	SD	Sea	^Cs		VCs
mm						Diameter series
mm						7,8,9	1,7,2,3,4
exceed	to	max	min	max	min	max		max	max	max	max	max	min	max
2.5	6	0	-4	0	-4	4	3	2	3	4	5	the same with inner ring		2.5
6	18	0	-4	0	-4	4	3	2	3	4	5			2.5
18	30	0	-5	0	-5	5	4	2.5	4	4	5			2.5

30	50	0	-6	0	-6	6	5	3	5	4	5			2.5
50	80	0	-7	0	-7	7	5	3.5	5	4	5			3
80	120	0	-8	0	-8	8	6	4	6	5	6			4
120	150	0	-9	0	-9	9	7	5	7	5	7			5

2.Maintenance and daily maintenance methods of slewing ring bearings

1. Maintenance and daily maintenance methods of slewing ring bearings in use

1. Before starting the bearing, refill with new grease according to the working conditions.

2. Grease should be added to the slewing ring bearing regularly. According to the type of bearing and different bearings, the time for adding lubricating oil is as follows:

a: Ball type: add grease every 100 hours of operation;

b: Roller type: add grease every 50 hours of operation;

For example, under high temperature, dusty, high temperature, high temperature and continuous working conditions, the filling time of grease must be shortened and ensured once every 50 hours; in the case of normal operation, it should be applied once every 150 hours , In the case of heavy work, it should be painted every 75 hours.

During long periods of downtime, the lubricating oil should be added again, and the raceway should be filled with each refueling until the oil overflows from the seal. When the grease is added, the rotating bearing should be slowly transferred to allow the raceway of grease evenly filled.

3. During the period of use, the dirt on the surface of the slewing bearing should be cleaned regularly, and attention should be paid to whether the bearing sealing ring is aging, cracked, damaged, or falling off.

If any of these situations occur, they should be treated immediately to prevent impurities from entering the raceway. And the loss of grease, and apply grease after replacement, so as to avoid the rolling elements and rollers from being stuck or corroded.

4. Due to the influence of various factors in practical application, appropriate grease can be selected according to the actual situation, such as graphite grease No. 3, graphite grease No. 4, industrial grease, No. 203 grease, high and low temperature bearing grease 7002 No. 2, aluminum-based grease No. 2, etc.

Special attention should be paid to the slewing ring bearing after 100 hours of operation, it should be preloaded, and then every 500 times of operation, it must be fully used.

5. After the accumulative operation of the device for 2000 hours, if one bolt is loose and is lower than 80% of the specified torque, this bolt should be replaced with the two adjacent bolts; if 20% of the bolts are loose and less than 80% of the specified torque, apply New bolt replacement. After 14,000 cumulative operating hours, all bolts are replaced with new ones.

6. During the operation, pay attention to the operating conditions of the slewing bearing. If noise, impact, or sudden increase in power is found, the operation must be stopped immediately until all faults are eliminated. If necessary, it must be disassembled.

7. When using the slewing bearing, it is strictly forbidden to use water to directly wash the rotating bearing to prevent the water flow from flowing into the raceway and cause rust; prevent hard objects from approaching or entering the meshing area to avoid damage or cause unnecessary trouble.

8. Customers have a common misunderstanding about the maintenance of slewing bearings. They think that the lubricating oil of the slewing bearing is the same as the lubricating cycle of the big and small arms, and it needs to be pumped every day.

But the opposite is true. If the lubrication cycle is too short, it will lead to excessive lubricating oil in the bearing, causing the seal ring to rupture and leak.

In the case of leakage, there will also be impurities infiltrated into the slewing bearing, affecting the work of the bearing. Usually the lubrication time of the rotary bearing is 250 hours. In the process of oiling, turn the machine while stirring, and oiling every 15 degrees is enough.

According to your work intensity, it can be adjusted appropriately for different usage situations. Lubrication is usually done once a week or so.

9. When lubricating the rotary motor, it is necessary to know that the lubrication cycle of the rotary motor is 1000 hours. In normal work, the amount of rotary oil should be checked from the oil dipstick. Sometimes abnormal wear occurs.

We need to open the window of the large gear to see See if the lubricating oil leaks from the seal ring into the large gear cavity.

In addition to the above maintenance measures, we should also frequently check whether the screws of the gear and the sealing ring of the rotary bearing are damaged. Some small gaps outside will be covered by mud. If it is not found in time, it is easy to cause the turntable to break or even cause an accident.

10. Maintenance points of large turntable bearings: large turntable bearings are composed of large gears, reducers, center sections, etc.

Generally, when we open the cover next to the boom base, we can see the lubrication condition inside the big gear and the wear condition of the gear. In the process of mechanical operation, the dustproof ring at the rotating center joint will be worn out.

If it rains, the rainwater will penetrate into the cavity of the large ring gear through the leakage of the rotating center joint, causing water accumulation in the hub. This will greatly affect the service life of the slewing bearing.

When the excavator is working, the grease in the cavity is diluted by water, and the lubrication effect is not ideal, which will increase the wear of the ring gear. Long-term soaking will cause the iron filings on the ring gear to fall off, resulting in abnormal rotation.

high quality ball slewing ring bearing in stock

1.The common noise of slewing ring bearing is dust sound and scar sound.

The two solutions are as follows:

(1) Control method of dust sound

There are foreign objects such as dust in the rotary branch, and non-periodic vibration will occur.

Dust noise control method: improve the cleaning method of slewing ring/slewing bearing, strictly clean the bearing, shaft, seat hole and matching parts before installation; remove foreign matter in the lubricant; improve the sealing of the bearing; avoid the use of impure materials Or plastic cages with embedded foreign objects.

slewing ring bearing Alt.

(2) Control method of scar sound

If the rolling surface of the slewing ring bearing is cracked, indented or corroded, periodic vibration and noise like riveting rivets will occur. The period may be fixed but most of them have a certain corresponding relationship with the rotation speed, and the scars will be continuous on the channel.

Occurs, scars appear and disappear on the steel ball, and this noise varies with installation and lubrication conditions.

The control method of this kind of noise: do not knock the bearing during installation, prevent the bearing from tilting when assembling the bearing and the shaft and then put it into the bearing seat; prevent the slewing bearing from rusting during storage and prevent shock and vibration during transportation; use high-viscosity grease .

(3) Noise caused by lubricating factors and its countermeasures

Incorrect selection of lubricant, insufficient lubricant or aging and hardening can cause vibration and noise in slewing ring bearing /slewing bearing, and this noise has no certain rules.

In this case, only the appropriate lubricant is selected, the amount of lubricant is adjusted, the service life of the lubricant is prolonged, and the replacement cycle is reasonably determined.

(4) Noise related to the host and its countermeasures

This kind of noise is not simply caused by the bearing, so it is ineffective to find the cause from the slewing bearing alone. The main engine should be paid full attention to, and the performance of the main engine should be improved if necessary. Now mainly describe the common buzzing sound and frame resonance sound in the motor.

A Motor buzzer and its countermeasures

The axial vibration of the motor shaft will cause a large high-frequency noise – buzzing sound, the frequency of which is the same as the axial vibration frequency, which can be constant or variable. The method to prevent buzzing is the same as the method to prevent axial vibration.

B-bearing frame resonance sound and its countermeasures

When the axial natural vibration of the outer ring mass system causes the axial bending natural vibration of the slewing ring bearing frame, a kind of noise called resonance sound will be generated.

The method of increasing the preload can increase the axial natural frequency of the outer ring mass system, destroy the resonance condition and reduce the noise.

3 row roller slewing bearings in stock

How to choose the roller length of the 3 row roller slewing bearing?

Slewing bearing, also called slewing bearing, plays an important role as a transmission component in many mechanical equipment. Among them, 3 row roller slewing 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 roller slewing bearings are usually selected.

There are many standard models of 3 row roller slewing bearings. If the standard model cannot meet the load requirements, a non-standard design is required, that is, the load of the slewing bearing is increased by increasing the diameter of the rollers. load.

The super-large diameter 3 row roller slewing bearing can increase the load by lengthening the length of the roller. The length of the contact with the raceway increases after the length of the roller, and the load of the roller naturally increases.

3 row roller slewing bearing Alt.

Extended rollers can be used on large-diameter slewing rings, but not on small-diameter slewing rings. The channel of the 3 row roller slewing bearing is a straight-line plane raceway. On the small-diameter circular plane raceway, the linear velocity difference between the two ends of the long roller is large.

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 3 row roller slewing bearing by increasing the roller diameter or increasing the roller length, we need to choose according to the actual situation.

high quality china slewing bearing suppliers 2022

What are the main failure modes of slewing bearings?

Due to its own quality and external conditions, the performance of the bearing will change due to its own quality and external conditions. When the performance index of a bearing is lower than the use requirements and affects the normal operation, This is called bearing damage or failure.

The main failure modes of slewing bearings:

1. Metal corrosion occurs

If the bearing lacks lubrication during use, it will be oxidized and rusted by the air. And don’t soak in water. The material of the slewing bearing is stainless steel.

When taking the bearing, wash off the sweat on the hand, apply mineral oil before taking the operation, especially in summer and rainy season, pay special attention to rust prevention.

2. Excessive load or improper use

Bearings cannot exceed their own load during use. Just like if the car pulls too heavy goods, it is easy to cause damage to the slewing bearing. Therefore, in general, the bearings of trucks are more easily damaged than cars, and the reason is that many of the parts are overwhelmed.

3. The slewing bearing clearance is too small

For example, the front wheels of the car use inclined-push slewing bearings, and the clearance of the bearings needs to be adjusted. If the clearance is too large, it will cause abnormal noise, deflection, or wheel shaking. If the clearance is too small, it will accelerate the wear of the bearing.

For old slewing bearings, it is necessary to check whether there are burrs, scratches or cracks on the surface of the ball (column), and whether the radial clearance and axial clearance are qualified; for new bearings, it is necessary to check the bearing type first. is it right or not.

slewing bearing Alt.

4. Use inferior slewing bearings

Some bearings are produced by some small factories whose production technology cannot meet the requirements. The accuracy of the shaft or bearing box is not accurate, and the steel of the bearing is directly pressed for production without proper treatment. Therefore, the service life of the produced bearing is not long.

5. Improper installation operation

When the bearing is installed, it is necessary to follow the installation steps of the bearing, and it cannot be installed and disassembled with brute force. Whether the bearing is installed correctly is closely related to the service life of the bearing.

When the bearing is installed, it is not allowed to punch or hit the bearing directly with a hammer. Try not to take it directly by hand. The sweat on the hand will also cause the bearing to rust.

6. Foreign body intrusion

When installing or using the bearing, you need to use special tools, try to avoid things such as cloth or short fibers, so as to prevent fibers from entering the bearing and causing damage.

If the installation personnel use the copper rod knock-in method when installing the bearing, the axial force of the bearing may be uneven, which will cause problems such as deformation of the cage, damage to the rolling elements, and enlargement of the clearance.

During the knocking process, copper powder may fly into the bearing cage, making the bearing prone to failure.

2.How to correctly judge and deal with the peeling of the slewing bearing raceway and the broken teeth of the ring gear

Due to the manufacturing quality problems such as material pores or uneven hardness and depth of the hardened layer of the interlayer raceway, or some external reasons,

the hardened layer of the raceway is peeled off or the teeth of the gear ring are broken during the use of the slewing bearing, so that the equipment cannot work normally.

For raceway peeling, first make a correct judgment. There is peeling, which is generally not easy to see on the outside. According to our experience, the following conditions indicate that the raceway has peeling layers:

when the main engine rotates under load, there is an abnormal “clack-clack” sound at the raceway, the rotation speed is uneven or the speed in a certain direction is obviously slowed down and accompanied by There is slight vibration;

the temperature rise of the rotary motor is too high or the current is too large; the keyway of the rotary motor and the hydraulic coupling or coupling is crushed, etc.

After peeling occurs, it must be repaired in time. Otherwise, the peeling area will expand, so that the entire slewing bearing will be scrapped.

The repair method is: first take out the rollers or steel balls in the slewing bearing to separate the inner and outer rings; then clean the raceways with gasoline;

then use a grinder (grinding wheel) to carefully remove the needle peeling area of Microsoft Corporation. Grind off the hardened layer of the cracks that have occurred around, and smooth the bottom of the peeling layer;

preheat the place where the raceway needs to be repaired with a welding torch, and use a medium carbon steel electrode for welding (the electrode must be dried before use, and followed by The welding layer should be slightly higher than the surface of the raceway by 1-2mm;

if the peeling layer is deep or the area is large, the welding should be applied in layers and sections, and the base metal temperature should not be too high to cause deformation;

this avoids Rapid cooling produces welding cracks, and thermal insulation measures should be taken immediately after welding to gradually cool him. After cooling, use a grinder to smooth the repair welding layer so that it is slightly higher than the surface of the raceway.

Gradually grind the repair welding layer with whetstone or metallographic emery cloth to make it the same height as the normal surface of the raceway.

Use the corresponding original curvature. Test the samples until they are qualified; clean the raceways and rollers (steel balls) with gasoline, apply grease, and complete the assembly.

The reason for the broken teeth of the rotating ring gear may be the quality problem of the cast section of the tooth base material (such as blisters, interlayers and other defects, which will obviously weaken the bending resistance of the gear);

stones or steel bars are embedded in the meshing of the gear teeth during use. The hard object increases the local bending stress of the gear teeth and breaks.

The repair method is local repair welding or tooth insert repair. The method of local repair welding is: first grind off the residual crack matrix of the damaged part with a portable grinding wheel, clean it with gasoline (oil);

use a welding torch to preheat this part, After reaching the fixed temperature, use a medium carbon steel electrode to push and weld the prototype of the tooth on the damaged part of the tooth, so that it is 1-2mm higher than the tooth surface of the party; until the tooth shape meets the requirements.

When a whole tooth of the rotary gear ring is damaged, it can be cut along the root of the tooth, and then the tooth root is filed into a fixed shape, and then the next tooth is stored on the same type of waste ring gear,

processed into the corresponding shape of the base metal, and then placed into the groove, and use the toothed template to clamp the positioning.

In order to ensure the consistency of the tooth pitch, and after the double-wire chuck is used to increase the value, it is welded with low carbon steel around the tooth. Use a file and other tools to smooth the weld to ensure that the meshing of the gear teeth is stabilized.

China Factory Wholesales Turntable Bearings

1.Comparison of the use of turntable bearings and geared slewing drives for truck-mounted cranes

Crane truck, referred to as crane (crane truck), is a hoisting mechanism installed on a cargo truck to achieve the purpose of loading or hoisting goods. The lifting mechanism can lift, retract and rotate, and can flexibly lift the goods and place them in the designated position.

The rotation of the hoisting mechanism is realized by the turntable bearing or the slewing drive. The above picture is a common hoisting mechanism with a slewing bearing installed. The outer tooth turntable bearing is equipped with a yellow protective cover to protect the operator and the equipment.

In the picture, near the slewing mechanism, the grease flows around and quickly loses, the equipment is dirty, and the grease is polluted and lost, resulting in frequent refilling of grease, high maintenance costs, and high equipment failure rate.

turntable bearing Alt.

Straight-toothed rotary drive, also called geared rotary drive, is composed of turntable bearings, gears, housings, adapter flanges, support turntable bearings, seals and other components. A rotary speed reducer that bears axial force, radial force and overturning moment at the same time and has a certain reduction ratio, referred to as rotary drive.

The structure of the spur gear rotary drive determines that the spur gear drive has the characteristics of dustproof and waterproof, compact design, convenient installation and use, stable and reliable, and low failure rate.

During the use of the truck mounted crane with gear type rotary drive, the equipment is kept clean, brand new, with low failure rate, no loss of grease, not easy to be polluted, low maintenance frequency, stable operation and long life.

beat china industrial positioners slewing bearing manufacturer

1.How to quickly and accurately measure the diameter of the slewing bearing channel?

When the slewing bearing is to grind and fit the sleeve at the end, the diameter of the channel must be tested to avoid repeated trial installation. Then, how to measure the diameter of the channel of the slewing bearing? There are many ways to detect the diameter of the slewing bearing channel.

There are calipers plus two steel balls, and there are also measurement methods to estimate the wall thickness, but some of the measurement errors are too large, and some of them are more complicated to detect.

If it is improved on the basis of the pipe ruler and made into a ball-end ruler, the diameter of the channel of the slewing bearing can be quickly and accurately measured on the machine tool.

slewing bearing Alt.

1. Making the measuring head

Generally, there are ready-made fixing rods at both ends of the pipe ruler. It is only necessary to change the shape of the measuring head. Cut the steel ball into two halves with wire cutting, and one half is welded on the measuring head by tin welding (or argon arc welding), and the other half is fixed on the measuring head. On the dial indicator head, and then install it on the fixed rod connecting the pipe ruler to measure.

2. Measurement method

Replace the fixed measuring head of the pipe ruler and the measuring head of the dial indicator with the steel ball used for assembling the slewing bearing channel, use the block gauge to align the diameter of the channel, calibrate the dial indicator of the tube ruler to zero, and measure At this time, the steel ball at the fixed end of the pipe ruler is positioned on one side of the slewing bearing channel, and the dial indicator is on the other side of the channel.

With the steel ball at the fixed end as the fulcrum, rotate the pipe ruler along the plane of the slewing bearing channel to find the turning point. The reading of the dial indicator is the measured value of the diameter of the channel. If the value reaches the required value, the channel will be ground and the next piece can be processed. If the size has not reached the required value, continue processing until the size meets the requirements.

3. Measurement accuracy verification

Comparing the bearing clearance calculated based on the measurement results of the ball end gauge with the actual bearing clearance after assembly, the error of the bearing clearance value calculated by the ball end gauge measurement is within 0.01mm, which proves that the ball end gauge measurement can meet the machining requirements of high-precision slewing ring bearings. testing requirements.

4. Detection advantages and disadvantages

(1) Testing on the machine tool does not require removing the parts from the machine tool for trial installation, which greatly improves work efficiency

(2) The measurement accuracy is high, which can meet the processing and testing requirements of small clearance slewing bearings

(3) This method can also be used for the detection of the channel diameter of the crossed roller slewing bearing

(4) The measuring tool needs to be self-made, the testing method must be skilled, and the requirements for testing personnel are relatively high.

cross tapered roller bearings price

1.Cross Tapered Roller Bearings

XR series crossed tapered roller bearings are designed to provide high rotational accuracy and rigidity in a small space, resulting in significant material cost savings.

This type of bearing is to install two sets of bearing raceways and rollers together at right angles, with adjacent rollers facing the opposite direction, spacer blocks are installed between the rollers, and support gaskets are also installed on the rollers. , which allows the two half-columns of the rollers to fit into the same space.

The angle and tapered geometry of the bearing allows the effective span of the bearing to be several times larger than the actual width of the bearing itself.

XR series bearings are suitable for high speed machine tool applications such as vertical boring machines and vertical grinding machines. It is also especially suitable for many equipment with limited space and high requirements for rotation accuracy.

roller bearing Alt.

Size range:

2463.800 mm (4.000 in. 至97.000 in.)

2819.400 mm (11.000 in. 至111.000 in.)

Folding Design Features:
The XR series has two rows of tapered rollers that are vertically crossed on the 90° V-shaped hob face through spacers, and can withstand radial loads, axial loads, and other loads in all directions.

Line contact on the raceway and roller construction provides maximum rotational accuracy, high stability and greater tilt stiffness. Adjustable preload design extends bearing life, maximizes stiffness and provides minimal runout.

Nylon spacers have low inertia and low operating torque. The components are made of surface carburized steel or electroslag remelted bearing steel with good impact resistance.

Folding application range:
Precision rotary indexing tables for machine tools, vertical and horizontal boring machines, vertical grinding machines, rotary surface grinding machines, large gear hobbing machines, gun and radar rotary tables, large radio and optical telescopes, rotating cameras.

steering pivots and continuous casting machines, Height-constrained pivot microscope stages, pole center pivots, rotary bogies, welding stands, rotary assembly jigs, industrial robots, precision rotary tables, medical instruments, metrology instruments, IC manufacturing equipment.

model
THK crossed roller bearingStandard Crossed Roller Bearing RB series models are as follows:

RB7013 RB8016 RB9016 RB10016 RB10020 RB11012 RB11015 RB11020 RB12016 RB12025 RB13015 RB13025 RB14016 RB14025 RB15013 RB15025 RB15030 RB16025 RB17020 RB18025 RB19025 RB20025 RB20030 RB20035 RB22025 RB24025 RB25025 RB25030 RB25040 RB30025 RB30035 RB30040 RB35020 RB40035 RB40040 RB45025 RB50025 RB50040 RB50050 RB60040 RB70045 RB80070 RB90070 RB1000110 RB1250110

INA crossed roller bearings SX series models are as follows:

SX011814 SX011818 SX011820 SX011824 SX011828 SX011832 SX011836 SX011840 SX011848 SX011860 SX011868 SX011860 SX0118/500

INA crossed roller bearing XSU series models are as follows:

XSU080168 XSU080188 XSU080218 XSU080258 XSU080318 XSU080398 XSU140414 XSU140544 XSU140644 XSU140744 XSU140844 XSU140944

THK crossed roller bearings RA series models are as follows:

RA10008 RA11008 RA12008 RA13008 RA14008 RA15008 RA16013 RA17013 RA18013 RA19013 RA20013

THK crossed roller bearing RE series models are as follows:

RE7013 RE8016 RE9016 RE10016 RE10020 RE11012 RE11015 RE11020 RE12016 RE12025 RE13015 RE13025 RE14016 RE14025 RE15013 RE15025 RE15030 RE16025 RE17020 RE18025 RE19025 RE20025 RE20030 RE20035 RE22025 RE24025 RE25025 RE25030 RE25040 RE30025 RE30035 RE30040 RE35020 RE35025 RE40035 RE40040 RE45025 RE50025 RE50040 RE50050 RE60040

THK crossed roller bearing RU series models are as follows:

RU124G RU148G RU178G RU228 RU297 RU445 RU228X RU297X RU445X RU228G RU297G RU445G

IKO Crossed Roller Bearing CRB series models are as follows:

CRB8016 CRB9016 CRB10016 CRB10020 CRB11012 CRB11015 CRB11020 CRB12016 CRB12025 CRB13015 CRB13025 CRB14016 CRB14025 CRB15013 CRB15025 CRB15030 CRB16025 CRB17020 CRB18025 CRB19025 CRB20025 CRB20030 CRB20035 CRB22025 CRB24025 CRB25025 CRB25030 CRB25040 CRB30025 CRB30035 CRB30040 CRB35020 CRB40035 CRB40040 CRB40070 CRB45025 CRB50025 CRB50040 CRB50050 CRB50070 CRB60040 CRB60070 CRB600120 CRB70045 CRB70070 CRB700150 CRB80070 CRB800100

LYMC Precision Crossed Roller Bearing

Crossed Roller Bearing

A crossed roller bearing is a special type of bearing with a split inner ring and a rotating outer ring. Since the divided inner ring or outer ring is installed with the roller and spacer, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to install the cross roller ring.

Since the rollers are arranged in a cross, only one set of Cross Roller Rings can withstand loads in all directions, and the rigidity is 3 to 4 times higher than that of conventional models.

At the same time, since the inner ring or outer ring of the crossed roller bearing is divided into two structures, the bearing clearance can be adjusted, and even if a preload is applied, high-precision rotational motion can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.

1.product description

Their rollers are arranged at right angles to each other at intervals between the inner and outer wheels. They can bear loads from all directions at the same time (such as axial, thrust or momentum loads, etc.).

Because the rollers are in linear contact with the track surface, the possibility of elastic deformation of the bearing under load is very small.

This type of bearing is widely used in such occasions as industrial automatic robots, working machinery and medical facilities, etc., where high rigidity, tightness and high speed are required to ensure accuracy.

In a crossed roller bearing, since the cylindrical rollers are arranged perpendicular to each other through spacers, a single crossed roller bearing can withstand loads in all directions, including radial load, axial load, and moment load.

The size of the inner and outer rings is minimized, especially the ultra-thin type is a small size close to the limit, and has high rigidity, so it is most suitable for the joint part or rotating part of industrial robots, the rotary table of machining center.

It is used for robot rotating parts, precision rotary tables, medical equipment, measuring instruments, IC manufacturing equipment, etc.

crossed roller bearing Alt.

2.Use features

For crossed roller bearings, since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the crossed roller collar to prevent separation from each other, so it is necessary to install the crossed roller collar. Simple.

Since the rollers are arranged in a cross, only one set of Cross Roller Rings can withstand loads in all directions, and the rigidity is 3 to 4 times higher than that of conventional models.

1. Excellent rotation accuracy

The internal structure of the crossed roller bearing adopts the rollers arranged at 90° perpendicular to each other.

There are spacers or spacers between the rollers, which can prevent the rollers from rubbing against each other due to the inclination of the rollers.

In addition, there is no contact phenomenon or locking phenomenon of one side of the roller; at the same time, because the inner and outer rings are divided structures, the gap can be adjusted, and even if a preload is applied, high-precision rotational motion can be obtained.

2. Simplified operation and installation

The outer ring or inner ring, which is divided into two parts, is fixed together after the rollers and cages are installed, so it is very easy to install.

3. Bear large axial and radial loads

Because the rollers are arranged perpendicular to each other on the 90° V-groove running surface by spacers.

4. Significantly save installation space

The size of the inner and outer rings of the crossed roller bearing is minimized, especially the ultra-thin structure is a small size close to the limit, and has high rigidity, so it is most suitable for the joint parts or rotating parts of industrial robots, and the rotation of machining centers.

Widely used for worktables, manipulator rotating parts, precision rotary tables, medical instruments, measuring instruments, IC manufacturing equipment, etc.

5. High speed capability

6. Reduced shaft length and machining cost, limited change in geometry due to thermal expansion

7. Using nylon divider, low moment of inertia, low starting torque, easy to control angle indexing

8. Optimized pre-tightening force, high rigidity and high running accuracy of guide rollers

9. Carburized steel provides excellent impact resistance and surface wear resistance

10. Simple but well lubricated

Classification and Model Series of Domestic Crossed Cylindrical Roller Bearings

RB type (outer ring split type)

The RB series is the basic type of the crossed cylindrical roller bearing. The inner and outer rings are minimized in size. The structure is that the outer ring is a split type and the inner ring is an integral design. It is suitable for parts that require high rotation accuracy of the inner ring. .

RE type (inner ring split type)

The RE series model is a new type produced by the design concept of the XRB type, and the main dimensions are the same as the XRB type. Its structure is that the inner ring is a split type, and the outer ring is a one-piece design, which is suitable for parts requiring high rotation accuracy of the outer ring.

RU type (inner and outer ring integrated type)

The RU series model does not need a fixed flange and a support seat due to the machining of the mounting holes. In addition, since the integrated inner and outer ring structure with seat is adopted, installation has little effect on performance, so stable rotation accuracy and torque can be obtained. Can be used for outer and inner ring rotation.

RBC type (outer ring split type)

The RBC series model (corresponding to the CRBC series of IKO company) has a structure that the outer ring is a split type, the inner ring is an integral design, and a full complement roller bearing with a cage. It is suitable for parts that require high rotation precision of the inner ring.

CRBH type (inner and outer ring integrated type)

The inner and outer rings of the CRBH series are of one-piece structure for rotation of the outer and inner rings.

RA type (outer ring split, ultra-thin type)

The RA series model is a compact model that reduces the thickness of the inner and outer rings of the RB type to the limit. Ideal for applications requiring a lightweight, compact design, such as robotic and manipulator rotation.

SX type (outer ring split type)

The structure of SX series models is similar to that of RB series. The outer ring is a two-part structure, connected by three spring snap rings, and the inner ring is designed as one piece, which is suitable for places requiring high rotation precision of the inner ring.

XRU08 type (integrated type of inner and outer rings)

The XSU08 series is similar to the RU series, and the inner and outer rings have been processed with mounting holes, so there is no need for a fixed flange and a support seat.

Due to the integrated inner and outer ring structure with seat, installation has little effect on performance, so stable rotation accuracy and torque can be obtained. Can be used for outer and inner ring rotation.

First thrust angular contact ball bearing

The contact angle of thrust angular contact ball bearings is generally 60°. Commonly used thrust angular contact ball bearings are generally bidirectional thrust angular contact ball bearings, which are mainly used for precision machine tool spindles.

It has the advantages of high precision, good rigidity, low temperature rise, high speed, and convenient assembly and disassembly.

Second deep groove ball bearing

Structurally, each ring of a deep groove ball bearing has a continuous groove-type raceway with a cross-section of approximately one third of the equatorial circumference of the ball.

Deep groove ball bearings are mainly used to bear radial loads, and can also bear certain axial loads. When the radial clearance of the rolling bearing increases, it has the properties of an angular contact ball bearing and can bear axial loads alternating in two directions.

Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient, high limit speed and high precision, and is the preferred bearing type for users when selecting models. Deep groove ball bearings have a simple structure and are easy to use. They are the type of bearing with the largest production volume and the widest application range.

Third thrust tapered roller bearing

Since the rolling elements in the thrust tapered roller bearing are tapered rollers, the rolling busbar and the raceway busbar of the washer meet at a certain point on the axis of the bearing, so the rolling surface can form pure rolling and high limit speed. for thrust cylindrical roller bearings.

Features: Thrust tapered roller bearings can withstand unidirectional axial loads. The type code of thrust tapered roller bearing is 90000 type.

Introduction to Crossed Cylindrical Roller Bearings

There are two types of crossed roller bearings, one is crossed cylindrical roller bearings, the other is crossed tapered roller bearings; crossed roller bearings have a long history of application abroad, but only recently in China.

It has only entered the public’s vision for a few years, and it is widely used due to its own particularity and incomparable advantages over other bearings.

bulk slewing bearing series

1.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 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.

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.

slewing bearing Alt.

2.Correct selection can increase the service life of the slewing bearing

1. Use environment

In the selection stage of the slewing bearing, the use environment should be described in detail. The following are several common use environments:

Wet environment: Water vapor should be prevented from entering the channel and corroding the bearing surface. Long-lip seals or multi-lip seals should be selected, or even multiple sets of seals should be added.

The large contact area between the seal and the bearing can effectively prevent the entry of water vapor, and the bearing surface is anti-corrosion. Treatment such as galvanizing, etc., prevents the bearing from rusting and corroding, resulting in fracture failure.

High temperature environment: use high temperature resistant materials, metal retainer or glass fiber retainer for retainer, high temperature resistant rubber such as fluorine rubber for sealing, and high temperature grease for grease.

Dusty environment: The main way to effectively prevent dust from entering the channel is the selection of seals, which is the same as the selection method in wet conditions.

2. Speed

The description of the rotation speed of the slewing bearing in the selection stage is not the number of revolutions per minute that we usually talk about. In fact, the slewing bearing is not used at a constant speed in many occasions. In the design, we will provide the limit speed, slewing The bearing can not be used for more than the corresponding specified time under the state of the limit speed.

Due to the high speed, the bearing temperature will be too high and the heat dissipation will be poor, resulting in channel burns, rolling element burns, and damage to the slewing bearing. Choose a high-speed slewing bearing. Bearings shall meet, integral copper retainers, high temperature seals and grease.

3. Load

There are various types of slewing bearings to choose from according to different load conditions. The load is divided into axial load, radial load and overturning moment.

Under the condition that the diameter of the slewing bearing remains unchanged, increasing the diameter of the rolling element can effectively increase the bearing size. The overall retainer can make the force of the rotating bearing more uniform.

In the selection stage of the slewing bearing, the description of the working conditions is very important. The more detailed the description, the more perfect the engineer’s selection and design, and the more suitable for the customer’s use.

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