Classification and characteristics of angular contact ball bearings

 Angular contact ball bearing is a common type of rolling bearing. The basic angular contact ball bearing consists of an outer side, an inner hole, a set of bearing steel balls and a set of ball bearings. There are two types of angular contact ball bearings: row entry and double row. The row item angular contact ball bearing number is 6, and the double row angular contact ball bearing number is 4. Its structure is simple and practical, and it is a more common and widely used bearing.

Principle of angular contact ball bearing: Angular contact ball bearing mainly bears axial load, but can also bear axial load and radial load. When it only bears the axial load, the interfacial tension is zero. When the axial backlash of angular contact ball bearing is large, it has the characteristics of angular contact bearing and can bear large radial load.

Angular contact ball bearing bearing structure: Angular contact ball bearing structure is simple, compared with other types, it is convenient to achieve higher manufacturing precision, which is conducive to mass production, and the manufacturing cost is also low. This type also has various shape modification structures such as: Angular Contact Ball Bearing with Seal Cover, Angular Contact Ball Bearing with Silicone Seal, Angular Contact Ball Bearing with Stop Groove, Steel Ball Groove Bearing with Stop Groove, Double Row of angular contact ball bearings.

Angular contact ball bearing is a relatively common rolling bearing. It consists of an outer side, an inner hole, a set of bearing steel balls and a set of ball bearings. The bearing can bear axial load and radial load, with simple structure and low manufacturing cost. All good for mass production. Today, the angular contact ball bearing manufacturer Rockwell Xiaobian will introduce to you the classification and characteristics of angular contact ball bearings. Let's take a look at it together!

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1. Classification of angular contact ball bearings

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1. Single row angular contact ball bearings

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(1) Single row angular contact ball bearings mainly include series 718, 719, 70, 72, 73, etc. The outer diameter and thickness of bearings with the same inner diameter and different series increase in turn according to the above order. Example 71900 and 71800 have the same inner diameter, but the outer diameter and thickness are larger than the latter.

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(2) Angular contact ball bearings can bear (one-way) axial and radial forces at the same time. Contact angles are generally 15° (suffix C), 25° (suffix AC), 30° (suffix A) and 40° (suffix B). The smaller the angle, the smaller the axial load and the faster the speed, and vice versa. , the greater the axial load, the slower the speed.

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2. Paired double angular contact ball bearings

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The bearing that combines two sets of radial bearings into pairs is called a paired double bearing. Usually paired duplex bearings are composed of the same angular contact ball bearings. Paired double angular contact ball bearings can be divided into three categories: back-to-back configuration, face-to-face configuration, and series configuration:

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(1) Back-to-back configuration (code DB): It can withstand radial loads and axial loads in two directions. The distance between the action points is large, so it is suitable for applications with large moment loads.

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(2) Face-to-face configuration (code DF): It can withstand radial loads and axial loads in two directions. Compared with the back-to-back duplex, the distance between the action points is small, so the moment load capacity is poor.

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(3) Tandem configuration (code DT): It can bear radial load and axial load in one direction. The axial load is supported by two bearings, so it is used for occasions where the load in one direction is large. ‍

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3. Double row angular contact ball bearings

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Double row angular contact ball bearings are double row angular contact ball bearings, but occupy less axial space (thickness is slightly narrower than two single row angular contact ball bearings), which can limit the bidirectional axial displacement of the shaft or housing, and the contact angle is 30°. Rigid bearing arrangements are available and can withstand overturning moments. It is widely used in the front wheel hub of the car.

Sealed Angular Contact Ball Bearings

4. Four-point angular contact ball bearing

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The four-point contact ball bearing is a single row angular contact ball bearing with separate inner and outer rings. The inner ring is divided into two parts, and one bearing can bear axial loads in two directions.

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The contact angle is 35°, and the axial load capacity is large, which is suitable for bearing pure axial load or synthetic load with large axial load. Interchangeable with face-to-face or back-to-back angular contact ball bearings.

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5. Thrust angular contact ball bearings

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The bidirectional thrust angular contact ball bearing and double row cylindrical roller bearing can bear bidirectional axial load when used together. Divided into 2344 and 2347 series, 2344 series is used for small match with double row cylindrical roller bearing tapered hole, while 2347 is used for large match.

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6. Ball screw support bearing

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The ball screw support bearing is a one-way thrust angular contact ball bearing with a contact angle of 60°, which is especially suitable for the support of high-speed precision CNC machine tools. Common ones are 7602 (standard metric), 7603 (standard metric), BS (non-standard metric) and BSS (non-standard imperial) series.

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Second, the characteristics of angular contact ball bearings

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1. Simple structure

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The structure and composition of angular contact ball bearings are relatively simple, which are embodied in the following aspects: first, in terms of shape, the shape of angular contact ball bearings is similar to that of deep groove ball bearings. One ring has only one rib, and the other side is a slope; It is the cage of the bearing. The cage of the angular contact ball bearing is solid or stamped, and does not require rivets; it can also be seen from these two aspects that although the structure of the angular contact ball bearing is simple, the strength has not been reduced.

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2. High limit speed

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The limit speed of angular contact ball bearings is relatively high. Under the same working intensity, the limit speed of angular contact ball bearings can be higher than other types 

Air conditioning bearing attention points and maintenance

 Air conditioner bearings pay attention to the following points:

From the perspective of use, to ensure that the bearing can work reliably, pay attention to the following points:

1. Improve the quality of lubrication, control the pressure, temperature and flow of oil, and strengthen oil filtration.

2. Use fuel and lubricating oil that meet the regulations.

3. It is unfavorable to control the temperature state of the diesel generator set, and it is unfavorable to work under the condition of supercooling and overheating. In cold weather, the diesel engine should be preheated before starting, and the crankshaft should be turned by hand to allow the oil to enter the friction surface.

4. The surface quality and geometry of bearings and journals should be strictly guaranteed.

5. The bearing clearance should be appropriate. If the generator set is too large, it will cause shock. If it is too small, the lubrication will be poor and the tiles may burn.

Air conditioner bearing maintenance:

It is also important to design and manufacture disassembly tools as needed. When dismantling, study the dismantling method, sequence,

Investigate the matching conditions of the bearing to obtain insurance for the disassembly operation.

Removal of the outer ring To remove the outer ring with interference fit, set several screws for the outer ring extrusion screw on the circumference of the outer casing in advance, and tighten the screw evenly while disassembling. These screw holes are usually covered with blind plugs, separable bearings such as tapered roller bearings, and several notches are set on the shoulders of the housing. Use spacers to remove them with a press, or gently tap to remove. The disassembly of the inner ring can be easily pulled out with a press. At this time, pay attention to let the inner ring bear its pulling force.

Furthermore, the pull-out clamps shown are mostly used, and no matter which kind of clamps, they must be firmly clamped on the side of the inner ring. For this reason, it is necessary to consider the size of the shaft shoulder, or study the machining of the upper groove at the shoulder, so as to use the drawing jig. The disassembly of the inner ring of the large bearing adopts the hydraulic method. Oil pressure is applied through the oil hole provided in the bearing to make it easy to pull out. For bearings with large widths, the hydraulic method is used in combination with the pulling jig for disassembly. The inner ring disassembly of cylindrical roller bearings can use the induction heating method. A method of drawing by heating the part in a short time to expand the inner ring. Where a large number of these bearing inner rings need to be installed, the induction heating method is also used.

Car air conditioner bearing is broken

If the bearing of the empty blower is damaged, abnormal noise will be heard in the glove box when the empty blower is turned on. If the bearing is damaged, the bearing can be replaced directly, or the entire fan can be replaced directly. The blower is an important part of the automobile air conditioning system. If there is no blower, the air conditioner outlet will not blow air.

The empty switch is an important comfort configuration in the car. The car air switch can be used for cooling or heating.

When the car air conditioner is cooling, the compressor clutch will be engaged, and the engine will drive the compressor to run.

When the compressor is running, it can continuously compress the refrigerant and transport it to the evaporating box, where the refrigerant continuously expands and absorbs heat, thereby cooling the evaporating box.

Cooling the evaporative box can cool the air blown by the blower, so that the empty air outlet of the car blows cold air.

When the car air conditioner heats up, the high-temperature coolant in the engine will flow through the warm water tank, and the wind from the blower will also pass through the warm water tank, so that the air outlet of the car can be adjusted to blow warm air.

The refrigerant used in the car air is r134a, and the car air needs to be regularly added with refrigerant.

Otherwise, the cooling speed of the car will be slowed down and the cooling effect will be worse.

It is recommended that you regularly add refrigerant and clean the air conditioning system when using the car, otherwise a lot of bacteria will grow in the air conditioning system.

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Selection and common models of agricultural machinery bearings

1. What is agricultural machinery bearing?

 Agricultural machinery bearing is one of the commonly used accessories of agricultural machinery. It is widely used in agricultural vehicles, tractors, diesel engines, electric motors, hay rakes, balers, harvesters, threshers and other agricultural machinery. Performance, life and reliability play a decisive role in the accuracy, performance, life and reliability of the host.

Agricultural machinery bearings can sustain continuous vibration and high impact loads, and can operate reliably under various weather conditions. The structure design is very simple, which can ensure the efficient utilization of the machine.

2. What are the commonly used models of agricultural machinery bearings?

There are also many types of equipment in agricultural machinery. The occasions and uses are different, so the bearings used are also different. The commonly used bearings in agricultural machinery are: agricultural machinery ball bearings (round hole, square hole or hexagonal hole, lock ring, relubrication) Oil holes or oil nozzles), angular contact ball bearings, outer spherical bearings, needle roller bearings, tapered roller bearings, etc. The models are mainly:

1. Crusher

6205RS, 6206RS, 6207RS, 6208RS, 6309RS.

2. Rice mill

1206, 1207, 1308, 1310, 1312, 1213, 1217.

3. Corn thresher

6201RS, 6203RS, 1203, 1204, 1205, 6205RS, 6206RS, 6305RS, 6307RS, 6308RS, UCP205, UCP206, UCP207.

4. Wheat seeder

Hexagon 6204RS, square eye 6205RS.

5. Planter

6806-2RS, 6807-2RS.

6. Corn planter

6004RS, 6204RS.

7. Grain depot conveyor

6203RS, 6204RS, 6205RS, 6207RS, 6208RS, 6307RS, 6308RS.

8. Turbo reducer

7207 (30207), 7208 (30208).

9. Gearbox of well rig

42211, 42215, 42304, 42306, 42310, 42312.

3. How to choose agricultural machinery bearings

Agricultural machinery bearings must be able to operate under extremely challenging conditions, from dry and abrasive environments to wet, corrosive, and highly polluted environments, so pay attention to choosing the appropriate model when choosing, and the selection of agricultural machinery bearings Two main aspects are considered:

1. Types of agricultural machinery bearings

Mainly consider the load size, direction, whether there is impact, speed level, alignment requirements, allowable space and other factors of the bearing that agricultural machinery needs to select.

2. The accuracy of agricultural machinery bearings

The type of agricultural machinery, the requirements for mechanical accuracy, etc. should be considered. Generally, the accuracy does not need to be as high as that of precision machinery, which is determined by the nature of the operation of agricultural machinery.

Anti-corrosion treatment method of agricultural machinery bearings

1) Surface finish: The appropriate method must be selected according to the surface characteristics of the anti-corrosion body and the standards at that time. Usually there are organic solvent washing, organic chemical solution and mechanical cleaning equipment.

2) After drying and cleaning the surface, consider drying the compressed air, or drying it from the air at 120℃*170℃, or wiping it with a clean cloth.

Agricultural machinery bearings

Analysis of Damage Causes of Agricultural Machinery Bearings

If the agricultural machinery bearings roll correctly without the correct selection, they can be used for a long time before the life of the agricultural machinery bearings. In this case, the damage is separate. On the other hand, accidental and early corruption occurs, which is not conducive to the initial corruption of the application. Due to this initial damage and defects in lubrication applications, there is also the problem of dirt penetration, large total deviation of agricultural machinery bearings, large shaft deflection, and insufficient scientific research work on agricultural machinery shaft bearings.

 

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Adapter sleeves Features and the difference between withdrawal sleeves

 

Adapter sleeves are the most commonly used components for bearings with tapered bores when locating on cylindrical shafts, as they can be used on plain or stepped shafts.

Adapter sleeve features

This bushing is easy to install and does not require additional fixing on the shaft. When using an adapter sleeve on an optical shaft, the bearing can be positioned anywhere on the shaft. When used together with a stepped ring on a stepped shaft, the bearing can be accurately positioned in the axial direction, and the withdrawal of the bearing is also convenient.

Adapter sleeve application

The adapter sleeve is used to fix the tapered hole self-aligning bearing (self-aligning ball bearing, self-aligning roller bearing) on ​​the shaft without shoulder, with simple structure, reliable operation, convenient bearing replacement, widely used in textile, light industry, papermaking, Metallurgy, belt transportation and conveying equipment and other industries.

The structure of the adapter sleeve

The adapter sleeve is composed of the adapter bush, lock nut, lock washer (or lock card) and other parts. Adapter sleeves with lock nut and lock washer are only interchangeable as a set. Spare parts from different sources are not interchangeable.

The difference between the adapter sleeve and the withdrawal sleeve

The adapter sleeve tightens the round nut against the bearing, and the withdrawal sleeve does the opposite. The specific implementation method is that the thread opening is different: the adapter sleeve is at the thin place, and the withdrawal sleeve is at the thick place.

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I need 6 heavy duty u-groove rollers for a custom made fork lift I am developing for my tractor. The thread width, or OD of the pipe the wheel will roll on is 2 3/8 inch. The flange diameter should be around 4 inch +- 1/2 inch. The axle diameter should be 5/8 to 3/4 inch and be on heavy duty bearings. If this cannot be found in 2 3/8 thread width, I could substitute 1 5/8 inch.

What is the difference between an adapter sleeve and a withdrawal sleeve?

Adapter sleeves and withdrawal sleeves are generally suitable for large bearings. The adapter sleeve is used to tighten the round nut and push the bearing, and the withdrawal sleeve is the opposite.

The original intention of the adapter sleeve and the withdrawal sleeve is to facilitate the installation and removal of the bearing, improve the efficiency and reduce the maintenance cost of the machine. In layman's terms, the adapter sleeve is used for the convenience of installation, and the withdrawal sleeve is used for the convenience of disassembly. And the use of the withdrawal sleeve and the adapter sleeve can achieve the effect of adjusting the internal clearance.

The adapter sleeve is convenient to adjust the axial positioning of the bearing, and has good self-locking performance. The use of the optical shaft avoids the stress concentration phenomenon of the stepped shaft, which is conducive to the use of heavy-duty transmission or occasions with shock and vibration.

Although the structure of this type of bearing device is simple, satisfactory results can only be achieved under the premise of correct installation and maintenance. Otherwise, haste will be counterproductive or even counterproductive.

The above content is to introduce how to install the bearing correctly, the difference between the adapter sleeve and the withdrawal sleeve. I believe that after reading the requirements of the bearing installation method and the difference between the adapter sleeve and the withdrawal sleeve, there should be a certain degree. learn.