How to adjust the gap between the bearings by adjusting the gasket?

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Adjuster gaskets are commonly used in electronic instruments, mold manufacturing, precision machinery, hardware, mechanical parts, stamping parts, and small hardware manufacturing. Repair molds, measure mold gaps, shake, swing, and instability due to mechanical aging. This product can be used to solve machine maintenance problems. How to use adjusting shim to adjust the bearing axial clearance and the position of the gear?

The method of adjusting the gap of the bearing is as follows:

First, use addition and subtraction to adjust the adjustment shim between the bearing cap and the base. Fill a set of gaskets of soft material (soft steel sheet or elastic paper) between the bearing end cover and the end face of the bearing seat; during adjustment, first do not install the gaskets on the bearing end cover, and tighten the bearing evenly on one side The screw on the end cover turns the shaft by hand until the rolling elements of the bearing contact with the outer ring and there is no gap in the shaft; at this time, measure the gap between the end cover of the bearing and the end face of the bearing seat, plus the need for normal bearing operation This is the total thickness of the gasket required between the bearing end cover and the end face of the bearing seat, and then fill the required gasket between the bearing end cover and the end face of the bearing seat, and tighten the screws.

Then, use the screws installed on the bearing cover to push the gland that presses on the outer ring of the bearing. Since most gears and shafts are installed in the form of shoulder or step positioning at one end, and spacer positioning at the other end, the position of the gear can only be adjusted by increasing the length of the spacer.

Decho is a professional supplier on bearings, gaskets and bolts products .If you need any , pls contact us by email [email protected]

Precautions when installing thrust ball bearings

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Precautions when installing thrust ball bearings

In the assembly process of thrust ball bearings, planar thrust bearings are mainly used for bearing axial load and are widely used. Although the installation operation of the thrust bearing is simple, the installation operation of the thrust ball bearing is relatively simple, but there are still errors in actual maintenance, that is, the installation position of the tight ring and loose ring of the bearing is incorrect, which leads to the failure of the bearing and the rapid wear of the journal . The tight ring and the axial neck are transitionally matched, so that the axial neck is quickly worn and dropped.

When the shaft rotates, the inner ring of the tight ring and the journal make a transitional fit, which drives the tight ring to friction with the end surface of the stationary part. When the shaft rotates, it drives the end surface of the stationary part to friction. When the axial force (Fx) When acting, the friction torque generated is greater than the resistance torque of the inner diameter matching. When the axial force (Fx) acts, the friction torque generated is greater than the resistance torque of the inner diameter matching. The guide (FX) forces the tightening ring to rotate and aggravate the journal wear.

Therefore, the following points should be paid attention to when installing thrust bearings.
1. Distinguish the tight ring and loose ring of the bearing, judge according to the size of the inner diameter of the bearing, divide the hole diameter of the tight ring and loose ring of the bearing into 0.1~0.5mm, the difference is 0.1~0.5mm)

2. The static block of the separation mechanism (that is, there is no moving part, mainly refers to the static block equipped with the separation mechanism).

3. In any case, the loose ring of the bearing should always rest on the end face of the fixed part.

Decho is a professional supplier of thrust ball bearings.. If you need any , pls feel free to contact us by email [email protected]

How to install needle roller bearings?

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When the full needle roller bearing is installed, an auxiliary sleeve is generally used. The auxiliary roller cover or the auxiliary roller cover supports the auxiliary roller cover so that the auxiliary roller cover does not fall off, and the auxiliary roller cover uses its own chamfer to lift the auxiliary roller cover. When the auxiliary roller cover slowly moves inward, the auxiliary roller cover or The secondary roller cover slowly withdraws until the secondary roller cover is installed. The outer diameter of the auxiliary coil and the auxiliary sleeve should be 0.1~0.3mm smaller than the shaft diameter.

In addition, the needle roller bearing can also be installed in this way. The outer diameter of the auxiliary sleeve is coated with a thin layer of lubricating oil, and it is inserted into the outer ring of the bearing, so that the auxiliary sleeve and the outer ring of the bearing form an annular hole, and then the needle Fit it into the annular hole. After installing the needle, use the working shaft to push out the auxiliary sleeve.

For needle roller bearings without inner ring and outer ring, a thin layer of grease can be applied to the rolling surface of the shaft hole or housing hole first, and then the needles can be affixed to the grease on the mounting part in turn. After installing all the needle rollers, leave a gap. The size of the gap should be 0.5mm in circumference of the needle roller bearing.

For needle roller bearings that are only used for stamping outer rings, because the outer ring wall is very thin, they cannot be knocked and installed by hand, and should be pressed in with a press. As the pressure is uneven when the hand hammer is hit, it is easy to cause local deformation of the outer ring of the needle roller bearing.

Decho is a professional supplier on needle roller bearings . If you need any , pls feel free to contact us by email [email protected]

What is the structural difference between deep groove ball bearings and angular contact ball bearings?

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Deep groove ball bearings are typical rolling bearings. They are widely used and can withstand radial and bidirectional axial loads. They are suitable for high-speed rotation and require low noise and vibration. Sealed bearings with steel plate dust caps or rubber seals, Pre-filled lubricating grease, outer ring bearing with stop ring or flange, easy to locate axially, and easy to install on the shell. The larger size bearing is the same as the standard bearing, but the inner and outer rings have a fixed groove , Increase the number of ball loading and increase the rated load.

Angular contact ball bearings: There is a contact angle between the ring and the ball. The standard contact angle is 15/25 to 40 degrees. When the contact angle is large, the axial load capacity is large. The small contact angle is good for high-speed rotation. Single row bearings can withstand radial directions. Load and unidirectional axial load. DB, DF and double row angular contact ball bearings can bear radial load and bidirectional axial load. DT group is suitable for occasions with large unidirectional axial load and insufficient single bearing rated load. Use ACH at high speed Type bearings, with small ball diameter and large number of balls, are mainly used for machine tool spindles.
All in all, angular contact ball bearings are suitable for high-speed, high-precision rotating occasions. Deep groove ball bearings and angular contact ball bearings with the same inner and outer diameters and the same width have the same inner ring size and structure, but the outer ring size and structure are different.

1. Deep groove ball bearings have double shoulders on both sides of the outer ring raceway, and angular contact ball bearings generally have only one shoulder;

2. The curvature of the outer ring raceway of deep groove ball bearings is different from that of angular contact ball bearings, and is often greater than that of angular contact ball bearings;

3. The position of the outer ring channel of deep groove ball bearings is different from that of angular contact ball bearings. It is not at the center position. The specific value is considered during design and is related to the size of the contact angle.

Decho is a professional supplier of deep groove ball bearing and angular contact ball bearings . If you need any , pls contact us by email [email protected]

How are angular contact ball bearings maintained?

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How are angular contact ball bearings maintained?

1. When the bearing runs for a certain period (or warranty period), remove all the bearings;

2. Use diesel or kerosene to soak and clean the bearing. If there are technical conditions, the sealing cover can be opened for cleaning;

3. Dry the cleaning oil after cleaning, and check whether the appearance is damaged;

4. Use a wooden rod with a diameter of about 150mm and an inner diameter such as an angular contact ball bearing (a hollow tube is better), and the bearing is fixed at one end;

5. Rotate the bearing quickly by hand, and at the same time put the other end of the wooden stick (wood tube) on the ear or the microphone of the audio amplifier, so as to listen to the noise of bearing rotation;

6. After fixing the bearing, move the wooden pole horizontally to check whether the bearing is worn or loose;

7. FAG bearings with severe looseness, excessive rotating noise, and severe defects should be eliminated and replaced with the same model;

8. Take an appropriate amount of lubricating grease (preferably yellow dry oil) and melt it with a slow flame (not overheating), and immerse the tested bearing in the barrel so that there is no bubble overflow. Remove the bearing from the lubricating oil before cooling, the amount of remaining lubricating oil is small. After the lubricating oil is cooled, the angular contact ball bearing is removed, and there is a large amount of remaining grease. Determine the amount of grease remaining when necessary.

9. Wipe the grease on the outside of the bearing with a soft cloth or toilet paper, install the fixing device of the bearing on the pulley, and the maintenance work is over.

Decho is a professional supplier of angular contact ball bearings. If you need any , pls feel free to contact us by email [email protected]

Introduction to the fixing method of the inner ring of imported bearings

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Imported bearings are divided into inner and outer rings. I think everyone knows this. So what is the fixing method of the inner and outer rings of the imported bearing? First, let’s introduce the fixing method of the inner ring of the imported bearing.

1. Fixed shoulder

The inner ring of the bearing is axially fixed by the shoulder and interference.

Suitable for supporting structures fixed at both ends.

The structure is simple and the outline size is small.

2. The circlip is fixed

The inner ring of the bearing is axially fixed by the shaft shoulder and the lock nut.

It can bear small bidirectional axial load.

The axial structure size is small.

3. Lock nut to fix

The inner ring of the bearing is axially fixed by the shaft shoulder and the lock nut. And there is a stop washer to prevent loosening, reliable, suitable for high-speed, heavy-duty occasions.

4. End face thrust washer fixed

The inner ring of the bearing is axially fixed by the shaft shoulder and the shaft end retaining ring. The shaft end retaining ring is fixed on the shaft end with screws. The fixing screws should have anti-loosening devices.

It is suitable for occasions where the shaft end is not suitable for thread cutting or the space is restricted.

5. Adapter sleeve fixed

Relying on the radial size of the inner hole of the adapter sleeve being compressed and clamped on the shaft, the axial fixation of the bearing inner ring is realized.

6. Withdrawal sleeve fixed

The clamping method of the withdrawal sleeve is the same as that of the adapter sleeve. However, because the withdrawal sleeve has a special nut, the bearing is easy to load and unload, and it is suitable for fixing the double row spherical bearing with large radial load and small axial load on the optical axis.

Decho is a professional supplier of imported bearings. If you need these bearings, pls contact us by email [email protected]

What causes the poor operation of stainless steel needle roller bearings?

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Stainless steel needle roller bearings can be used in medical equipment, food processing, optical instruments, precision instruments, machine tool motors, machining and other industries. However , Some problems will inevitably occur during use.

The problem listed below :

1. shaft heating

Solution: If it is because the sealing ring on the shaft is too tight, you can adjust the position of the packing back cover appropriately. If it is caused by the friction between the stainless steel needle bearing cover and the shaft in the radial direction, you need to adjust the difference between the two Clearance.

2. bearing heating

Solution: If the lubricating oil of the bearing is not enough, you need to check whether the oil circuit is normal and add lubricating oil regularly. If the assembly is not aligned correctly, you can add a gasket at the base of the bearing.

3. axial runout

Solution: If it is because the bearing is not stable, you can use a roller ring to fix it. If it is because the stainless steel bearing clearance is too large to cause axial runout, you need to adjust the gap.

4. oil leakage

Solution: If it is because of the failure of the sealing decoration, you need to replace the sealing material. If it is because the lubricating oil has increased too much, the oil volume needs to be reduced. Generally, the oil volume can be increased at the standard height.

5. the amount of oil on the main friction surface is small

Solution: If it is because the oil ring rotates slowly, you need to check whether the oil ring has fallen off, if it needs to be fixed in time, if it is because the oil groove is shallow and the oil pipe is blocked, you need to deepen the oil groove and clean the oil pipe. .
Among the many parts of mechanical equipment, stainless steel bearings are used frequently, and occasionally, they may malfunction during use. What is the cause? Once it malfunctions, it will seriously delay production.

After years of accumulated experience, stainless steel needle roller bearing technicians have summarized the following four reasons for the poor operation of stainless steel bearings:

Four reasons for the poor operation of stainless steel bearings.

1. Poorly smooth

In many cases, the poor operation of stainless steel bearings is due to poor smoothness. If the bearing surface is relatively smooth, hotness can reduce wear and friction and reduce the chance of rust.

2. Bearing over temperature

In many cases, if the temperature of the stainless steel bearing is too high during use, it is easy to cause poor operation. The bearing accuracy is relatively low, the type selection is not good, and the cooling effect is not safe. It is easy to cause the bearing over-temperature phenomenon.

3. Dust and environmental pollution

Dust and particles floating in the environment will enter the single weight of the stainless steel bearing. If the bearing is not cleaned regularly, the dust and impurities will wear the bearing and cause poor operation.

4. Power supply system problems

If the power supply is frequently switched on and off, it will cause the working voltage and current to fall out of frame, which will lead to over-temperature or poor operation due to load, which will shorten the life of the stainless steel bearing. The higher the power, the greater the exchange voltage, and the easier it will be. risk.

Decho is a professional supplier on stainless needle roller bearings, pls do not hesitate to contact us by email if you need any . [email protected]

do you know how many kinds of cages for needle bearings ?

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The structure of needle roller bearings can be roughly divided into the following types:

1 Needle roller bearings with inner ring and outer ring.

2. Needle roller bearings without inner ring.

3. Needle roller bearings without cages on inner and outer rings.

In the first two structures mentioned above, it can be with or without a cage, because the full needle roller (without cage) bearing has a low speed, but its load-bearing capacity is extremely large, so the application is still Need to retain this structural form. Needle roller bearings without an inner ring can be divided into two structures: a solid outer ring and a stamped outer ring. Due to the different structure of needle roller bearings, the shape of the cage is also different. Each cage structure has its own characteristics. Several commonly used bearing cages are described as follows:

1. “K” shaped bearing cage

“K” shaped bearing cage

Its main advantage is that the rigidity and strength are high, and the outer diameter guide or inner diameter guide can be adopted in the design according to requirements. Tube material processing is used in production, except for the window punching process, no complicated molds are required, so it is not only suitable for mass production, but also for small batch production, especially for small-sized bearings, using “K”-shaped cages. It has better manufacturability than the “M”-shaped cage. For double-row and multi-row needle roller bearings, from the analysis of the processability of the double-row or multi-row window holes of the cage, the “K” shape has better conditions than the “M” shape, so the “K” shape cage becomes the current needle roller retainer. The common structural form of the frame is due to the development of bearings. There is a trend to increase the number of rolling elements. Due to the excessive thickness of the wall of the “K”-shaped cage, such as increasing the number of window holes, it is easy to cause the distortion of the cage lintel during processing. The number of needles of the “K”-shaped cage is generally less than that of the “M”-shaped cage of the same series.

2. “M” shaped bearing cage

Its main advantage is that it can maintain a larger number of needle rollers and the lubrication conditions are also better. The cage can only be guided by the outside, which is a better cage structure for single row needle roller bearings. “M”-shaped cages can be produced with tube materials. Only in the window punching process, it is more difficult to master than “K”-shaped cages. It is suitable for mass and small batch production, and it is also one of the commonly used structures.

3. Thin-wall stamping “M”-shaped bearing cage

Not only can it keep more needle rollers, but the needle rollers have the largest length, so that the bearing can achieve the most ideal load capacity. In addition, the cage requires surface treatment to obtain better rigidity and improve wear resistance. Due to the limitation of thin wall, this kind of cage can only be applied to medium-sized bearings.

4. “I” shaped bearing cage

Needle roller bearings without inner and outer rings are one of the structures designed by our country. This kind of cage has the advantages of simple geometry, better craftsmanship, and fewer procedures. It is recommended to use 20 steel pipes to process, which can meet the requirements of not falling or clamping the roller needle after punching the window hole, and does not need to carry out the rolling printing process.

5. New “K” shaped bearing cage

It is one of the structures designed by our country. This product also has the advantage that the needle cannot be dropped or clamped after the window hole is punched. In foreign countries, this structure is only used for bearings with a solid outer ring, and the outer diameter does not require locking needle rollers. The improved domestic “K”-shaped structure has ideal manufacturability. It has been gradually developed through the summary of domestic production practices and needs further testing and improvement.

6. “O” shaped bearing cage

It is mostly used for bearings with a stamped outer ring, and the cage requires surface heat treatment to enhance rigidity.

7. “M” shaped bearing cage without ribs

This structure is stronger than the above-mentioned “O”-shaped cage and has better lubrication conditions. The cage requires surface heat treatment. This structure is also mostly used for bearings with stamped outer rings.

8. Two-half combined bearing cage

As shown in the figure above, the two-half combined cage has different structures. Firstly, the integral cage with the equally divided window holes is processed, and then the annular ribs at both ends of the window holes of the cage are cut off. When the bearing is installed, two more long needles with the same height as the cage are added. As shown in Figure b, a small opening is cut off at both ends of the cage window hole, and two roller needles of equal length are installed during installation. Figure c is a cut on a wider lintel on the cage to form a gap between the two halves of the cage without adding additional needles. Bearings with this structure cause uneven load distribution of the bearing due to the unequal division of the needle roller positions, and the lintels on both sides of the cage bear greater stress, which will cause damage to the bearing when the speed is high. The working performance of the bearing is not as good as the bearing of the above two structures.

In addition, there are structures such as “W”-shaped bearing cages and “I”-shaped bearing cages, but they are not as widely used as the above-mentioned cages.

Tianjin Decho is a professional supplier on all kinds of needle bearings. If you need to buy any needle bearings, pls send your request to [email protected]

The key points of actual operation of the disassembly method of automobile needle roller bearing

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There are generally 3 points for actual operation of the disassembly method of automobile needle roller bearing

1) The knocking method, under normal circumstances, when the bearing needle roller is removed by the knocking method, the key function of the knocking force lies in the inner ring of the bearing, and it cannot be added to the turning body of the bearing and the maintenance wall; in other words, this type of disassembly method The key lies in the selection of the top priority, and the placement of the protective layer pad should be appropriate.

2) The thermal disassembly method, the engine oil should be heated to 100 degrees Celsius in actual operation, and then the engine oil should be irrigated onto the bearing needles that are willing to be disassembled. After your bearing ring is heated and deformed, the bearing needles can come out, which is very easy to operate. .

Compared with the two disassembly methods, it is more stable and reliable to disassemble the bearing needle by pressing method. It uses a punch to push the bearing, so that it is not easy to cause damage to the equipment, and the bearing needle can maintain a stable consistency. Sex.

3) There is also a drag-out method. In this way, a professional puller must be used for disassembly. If the rocker of the puller is selected, it can be gradually pulled out.

Fully grasp the load force of all bearing needles, so that higher quality bearing products can be purchased, and then consider the requirements of the application of mechanical equipment, so the load force has become one of the key information for selecting needle roller bearings.

Generally speaking, needle roller bearings can be used to bear heavy loads; while ball bearings are used to bear light or medium level loads; bearings manufactured by nitriding steel or bainite heat treatment can bear impact and vibration loads . It is not difficult to see that for safety considerations, it is necessary to master the characteristics of bearings in industrial production.
If the load is unqualified, it will cause greater damage to the middle and late application of bearing needle rollers. It is not difficult to see that the quality of bearing needle rollers is related to the operating conditions of industrial equipment. A good bearing needle roller can make full use of its effect, make the transmission system of machinery and equipment smooth, improve efficiency, and can reasonably alleviate the friction between each component and improve the service life of machinery and equipment.

Improper assembly will cause various failure forms of the bearing, and often the matching between the inner hole of the bearing and the shaft and the improper fit between the shaft diameter and the bearing seat hole often occur.

The matching between the inner hole of the bearing and the shaft adopts the basic hole system, and the matching between the outer circle of the bearing and the bearing seat hole adopts the basic shaft system. Generally, the shaft and bearing inner race of centrifugal pumps, centrifuges, reducers, motors and centrifugal compressors that work under normal load conditions adopt j5, js5, js6, k5, k6, m6 coordination, and the bearing housing holes and bearings The outer seat ring adopts j6 and j7 coordination. Rotating races (inner races of most bearings are rotating races, outer races are not rotating races, a few bearings are the opposite), usually with interference fit, bearing needles can avoid races under load Rolling and sliding occur on the mating surface of the shaft diameter and the bearing seat hole.

But sometimes because the shaft diameter and the size of the bearing seat hole are not measured or the mating surface roughness does not meet the standard requirements, excessive interference fit is caused, and the bearing seat ring is greatly squeezed, resulting in the radial clearance of the bearing itself. Reduced, making the bearing difficult to rotate, heating, abrasion intensified or stuck, and in severe cases, it will cause the inner and outer races of the bearing to crack during installation. The non-rotating seat ring often adopts a fit with little clearance or interference. In this way, the non-rotating seat ring may produce a small creep, and the contact surface of the seat ring and the rolling element is constantly replaced, and the raceway of the seat ring wears evenly. At the same time, it can also eliminate the axial jam of the rolling elements in the bearing due to thermal elongation of the shaft. However, excessive clearance fit will cause the non-rotating race to rotate with the rolling elements, causing serious wear on the shaft (or bearing seat hole) and the inner race (or outer race), and friction will cause the bearing to heat and vibrate.

Decho is a professional supplier on needle bearings, if you have any request , pls donot hesitate to contact us by email [email protected]