The ways to make bearings smooth

The purpose of bearing lubrication is to enable the bearing to operate normally, prevent direct contact between the raceway and the surface of the rotating body, reduce friction and wear inside the bearing, extend the service life of the bearing, enhance the performance of the bearing, and also prevent foreign matter from invading the interior of the bearing and causing Rust and degradation.

01 Manual smoothing
This is the original method. When the lubricating oil of the bearing is insufficient, an oiler is used to supply oil. However, this method is difficult to maintain a constant amount of oil, and there is a greater risk of forgetting to refuel. It is usually only used in situations of light load, low speed or intermittent movement. When operating, install a dust cover or ball valve on the refueling hole, and use Felt, cotton, wool, etc. are used as filter devices.

02 drops of smoothness
It is usually used for light-load and medium-load bearings whose peripheral speed is less than 4~5m/s. A roughly quantitative amount of lubricant oil is supplied from the container through holes, needles, valves, etc. The classic one is the dripping oil cup. The amount of oil dripping depends on the lubrication. There are significant changes in oil viscosity, bearing clearance and oil supply hole location.

03 Oil ring is slippery
The lubricating oil from the oil pool is brought to the bearing by a ring that is hung on the shaft and can rotate (can only be used for horizontal shaft lubrication). It is suitable for medium-speed and high-speed bearings with a shaft diameter greater than 50mm. The oil ring is seamless , when the bearing width-to-diameter ratio is less than 2, only one oil ring can be used, otherwise two oil rings are required.

04 Oil rope is slippery
The capillary and siphon functions of the oil rope are used to guide the lubricating oil in the oil cup into the bearings. It is mainly used for light-load and medium-load bearings with a peripheral speed of less than 4 to 5 m/s. The rest of the oil rope can filter during the entire process. of dyeing.

05 Oil pad is smooth
Use the capillary diffusion of the oil pad to apply the lubricating oil in the oil pool to the surface of the shaft diameter. This method can keep the friction surface clean at all times, but dust will also suffocate the capillary pores and cause insufficient oil supply. The oil supply of oil pad lubrication is usually only 1/20 of that of oil lubrication.

06Oil lubrication
This lubrication method involves immersing part of the bearing in lubricating oil. It is often used for thrust bearings on vertical shafts, but not for radial bearings on horizontal shafts.

07 Oil tank lubrication
The lubricating oil splashed from the rotating parts in the oil tank is supplied to the bearings, which is suitable for bearings with higher speeds.

08 Spray lubrication
The lubrication method of atomizing lubricating oil and spraying it on the friction surface is suitable for high-speed bearings.

Our company sells bearing adapter sleeves

Adapter sleeves are the most commonly used component when positioning bearings with tapered holes on cylindrical shafts, because this type of bushing can be used on smooth or

stepped shafts.

The bushing is easy to install and requires no additional fixing on the shaft. When using an adapter sleeve on a smooth shaft, the bearing can be positioned anywhere on the

shaft. When used together with the stepped ring on the stepped shaft, the bearing can be accurately positioned axially and also facilitate the disassembly of the bearing.

Adapter sleeves are used to fix tapered hole self-aligning bearings (self-aligning ball bearings, self-aligning roller bearings) on shoulderless shafts. They have a simple

structure, reliable operation, and easy bearing replacement. They are widely used in textiles, light industry, papermaking, etc. >Metallurgy, belt transportation and conveying

equipment industries.

The adapter sleeve is composed of an adapter bushing, a locking nut, a locking washer (or locking card) and other parts. Adapter sleeves with lock nuts and lock washers are

only interchangeable as a complete set. Parts from different sources are not interchangeable.

The mark of the adapter sleeve is represented by the Latin letter H and Arabic numerals. The Arabic numerals from left to right represent the size series code and the

applicable bearing nominal inner diameter code respectively. An example is shown in the figure.

The adapter sleeves suitable for uranium bearings with an inner diameter of 40mm and size series 23 are:H2308 GB 9160.1

The following are examples of common bearing adapter sleeve sizes. If you have any needs, please contact our staff directly and we will provide you with professional answers.

What is a ball bearing used for?

Ball bearings are a type of rolling bearing. Spherical alloy steel balls are installed between the inner steel ring and the outer steel ring to reduce friction during power transmission and improve mechanical power transmission efficiency in a rolling manner. Ball bearings cannot bear large heavy loads and are more common in light industrial machinery. Ball bearings are also called ball bearings.

Ball bearings mainly include four basic components: ball, inner ring, outer ring and cage or retainer. Ball bearings for general industrial use meet the AISI52100 standard. The balls and rings are usually made of high-chromium steel, with a Rockwell C-scale hardness of approximately 61-65.

Ball bearings are generally used in low-load mechanical transmission equipment. Because the load-bearing area of ball bearings is small, serious mechanical damage is easily caused under high-speed operation. Therefore, needle roller bearings are often used in heavy-load mechanical transmission to increase the load-bearing area, improve mechanical transmission efficiency, and reduce the Mechanical damage.

Ball bearings change the friction method of the bearing and use rolling friction. This method more effectively reduces the friction between the bearing surfaces, increases the service life of the fan bearing, and therefore extends the service life of the radiator. The disadvantage is that the process is more complex, the cost increases, and it also brings higher working noise.

What are the advantages of slewing bearings?

Rotary drive usually consists of worm, slewing bearing, housing, motor and other components. Since the core component adopts slewing bearing, it can bear axial force, radial

force and overturning moment at the same time. There are many forms, but the structural composition is basically the same.

The slewing bearing is a large bearing that can withstand comprehensive loads and can withstand large axial, radial loads and overturning moments at the same time. Slewing

support bearings generally have mounting holes, internal gears or external gears, lubricating oil holes and sealing devices, which enable the host to be compact in design,

easy to guide and easy to maintain.

Slewing ring bearings include toothless, externally toothed and internally toothed four-point contact ball bearings, double-row angular contact ball bearings, crossed

cylindrical roller bearings, crossed tapered roller bearings and three-row cylindrical roller composite bearings. series, in which four-point contact ball bearings have high

static load capacity, crossed cylindrical rollers have high dynamic load capacity, and the pre-interference of crossed tapered roller bearings can make the bearings have

greater support rigidity and rotation accuracy. Three-row cylindrical roller combined bearings have the characteristics of making the main engine more compact due to the

increase in load-bearing capacity leading to higher bearing height. Various forces are borne by different raceways, so under the same force, the bearing diameter can be

greatly reduced. A slewing bearing with high load carrying capacity.

Slewing bearings are widely used in large slewing devices of hoisting machinery, mining machinery, construction machinery, port machinery, ship machinery, and high-precision

radar machinery and missile launchers. At the same time, we can also design, develop and produce various special structure slewing bearings according to the specific

requirements of users.

Slewing bearings are widely used in real industry and are called “joints of machines”. They are mainly used in: truck cranes, railway cranes, port cranes, marine cranes,

metallurgical cranes, container cranes, excavators , filling machines, and CT machine standing wave therapy devices, navigation instruments, radar antenna bases, missile

launchers, tanks, robots, revolving restaurants, etc.

In addition to various engineering machinery, the application scope of slewing bearings has gradually expanded. Currently, equipment platforms such as port equipment,

metallurgical equipment, and drilling platforms have begun to use slewing bearings to replace original bearings on a large scale.

What is a needle roller bearing?

Needle roller bearings are roller bearings with cylindrical rollers that are both thin and long relative to their diameter. This type of roller is called a needle roller. Despite its smaller cross-section, the bearing still has a high load-bearing capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest. It is especially suitable for support structures with limited radial installation dimensions.

Depending on the application, a bearing without an inner ring or a needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and operating performance. As with ring bearings, the hardness, machining accuracy and surface quality of the shaft or housing hole raceway surface should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.

Features of needle roller bearing:

Needle roller bearings are equipped with thin and long rollers (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so the radial structure is compact, and its inner diameter size and load capacity are the same as other types of bearings. , the smallest outer diameter, especially suitable for support results with limited radial installation dimensions. Depending on the application, a bearing without an inner ring or a needle roller and cage assembly can be selected. At this time, the journal surface and shell hole surface matching the bearing are directly used as the inner and outer rolling surfaces of the bearing to ensure the load capacity and operating performance. As with ring bearings, the hardness, machining accuracy and surface quality of the shaft or housing hole raceway surface should be similar to the raceway of the bearing ring. This kind of bearing can only bear radial load.

Installation of bearing:

Installation of full complement needle roller bearings is usually carried out using auxiliary sleeves. At this time, the auxiliary roller or auxiliary sleeve holds the needle roller to prevent it from falling out, and the journal lifts the needle roller with its own chamfer. As the needle roller bearing slowly moves inward on the journal, the auxiliary roller Or the auxiliary sleeve will be slowly withdrawn until it is installed in the working position.

The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the shaft diameter. When installing, first apply grease to the inner surface of the bearing outer ring, place the needle roller close to the inner surface (there should be a gap when placing the last needle roller), and then put the auxiliary roller that replaces the journal or the inner ring of the bearing. Or push the auxiliary sleeve into the outer ring hole and align its end face with the end face of the installation shaft or the end face of the inner ring of the bearing installed on the shaft, and then tap with a press or hand hammer to apply pressure.

Needle roller bearings can also be installed by applying a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve and inserting it into the bearing outer ring so that the auxiliary sleeve and the bearing outer ring form an annular hole, and then install the needle roller in the annular hole. After installing the needle roller, use the working shaft to push out the auxiliary sleeve.

For needle roller bearings without an inner ring or outer ring, when installing, first apply a thin layer of grease on the rolling surface of the shaft or housing hole, and place the needle rollers in close contact with the grease at the installation site. There should be a gap when placing the last needle roller. The size of the gap should be 0.5mm on the circumference of the needle roller bearing. Do not force-squeeze the last needle roller in, or install one less needle roller, because when it is hard-squeezed, the bearing will be stuck and unable to rotate; when too little is installed, the gap will be too large, which can easily cause the needle roller to break when the bearing is running. Twist and break. For needle roller bearings with only stamped outer rings, since the outer ring wall is very thin, do not hit it with a hammer for installation, but press it in with a press. Because when hammering with a hand hammer, the pressure is uneven, it is easy to cause local deformation of the outer ring of the needle roller bearing.

what is a wheel bearing

The main function of the hub bearing is to bear the load and provide precise guidance for the rotation of the hub. It bears both axial load and radial load, and is a very important component.The wheel hub bearing unit is developed on the basis of standard angular contact ball bearings and tapered roller bearings. It integrates two sets of bearings into one. It has good assembly performance, can omit clearance adjustment, is light in weight, has a compact structure, and has a large load capacity. Large, sealed bearings can be filled with grease in advance, omit external hub seals, and are maintenance-free. They have been widely used in cars, and there is also a trend of gradually expanding their application in trucks.

Installation and use of wheel bearings:

1.In order to ensure safety and reliability to the greatest extent, it is recommended that you check the hub bearings frequently no matter how old the vehicle is – pay attention to the early warning signs of bearing wear: including any friction noise during rotation or suspension combination wheels turning Abnormal deceleration. For rear-wheel drive vehicles, it is recommended that the front hub bearings be lubricated when the vehicle has driven to 38,000 kilometers. When replacing the brake system, check the bearings and replace the oil seal.

  1. If you hear the noise from the hub bearing, first of all, it is important to find the location where the noise occurs. There are lots of moving parts that could be generating noise, or some rotating parts making contact with non-rotating parts. If it is confirmed that the noise is in the bearings, the bearings may be damaged and need to be replaced.
  2. Because the working conditions of the front wheel hub causing bearing failure on both sides are similar, even if only one bearing is broken, it is recommended to replace it in pairs.
  3. Hub bearings are sensitive and in any case the correct method and suitable tools are required. In the process of storage, transportation and installation, the parts of the bearing must not be damaged. Some bearings require greater pressure to press in, so special tools are required. Be sure to refer to the vehicle manufacturer’s instructions.
  4. When installing the bearing, it should be in a clean and tidy environment. The entry of fine particles into the bearing will also shorten the service life of the bearing. It is very important to maintain a clean environment when replacing bearings. It is not allowed to hit the bearing with a hammer, and be careful not to drop the bearing on the ground (or similar mishandling). The condition of the shaft and housing should also be checked before installation, as even minor wear can lead to poor fit and premature failure of the bearing.
  5. For the hub bearing unit, do not attempt to disassemble the hub bearing or adjust the sealing ring of the hub unit, otherwise the sealing ring will be damaged and water or dust will enter. Even the raceways of the sealing ring and the inner ring are damaged, resulting in permanent failure of the bearing.
  6. There is a magnetic thrust ring in the sealing ring of the bearing equipped with the ABS device. This thrust ring cannot be subject to collision, impact or collision with other magnetic fields. Remove them from the box before installation and keep them away from magnetic fields such as those used by motors or power tools. When installing these bearings, change the operation of the bearings by observing the ABS alarm pin on the instrument panel through a road test

Our company has been equipped with RHBS2080 CNC bearing super precision machine

The RHBS2080 CNC bearing super-finishing machine equipped by our company is suitable for super-finishing three types of self-aligning inner rings, inner and outer ring raceways of tapered cylindrical roller bearings, and is suitable for super-groove processing technology for the outer diameter of support rings.

RHBS2080 CNC bearing super precision machine super precision method:

1.Through the interpolation of the x-axis and z-axis, the shape of the raceway to be processed is obtained, and there is a small vibration, and the processing surface of the workpiece is super-precision.

2.Single-station two-step super-finishing process is adopted, and the rough and fine super-stations are automatically switched during the processing. The oil stone pressurization adopts pneumatic pressurization and has automatic compensation function. When super-finishing, the oilstone is always in contact with the surface of the workpiece and the pressure remains unchanged. The structure has radial adjustment function to adapt to the super precision of workpieces of different sizes.

Working principle of bearing super precision machine:

Bearing super precision machine is also the super precision machine used on bearings. Some are also called bearing raceway super precision machines. They mainly include motors, connecting rods, pressure springs, reciprocating shafts, super precision shafts, and super precision machines. Shaft barrel, the motor shaft is connected to the eccentric sleeve with a key. There is a semicircle outside the eccentric sleeve. The front end of the connecting rod is welded and connected to the semicircular body. The other end of the connecting rod is connected to the reciprocating shaft through a linking pin and is set on the reciprocating shaft. There is a sliding sleeve and a compression spring. The other end of the reciprocating shaft is connected to a fastening sleeve. The fastening sleeve is fixed on the super-precision shaft barrel. The barrel is set on the super-precision shaft. The motor and the bearing carrier plate supporting the super-precision shaft are fixed. On the carrying roller.

Advantages of bearing superfinishing machine:

  1. Can effectively reduce waviness. During the super-precision grinding process, in order to ensure that the whetstone always acts on the wave crest and does not contact the wave trough, the arc of the contact between the whetstone and the workpiece ≥ the wavelength of the waviness of the workpiece surface. In this way, the contact pressure of the wave crest is relatively large, and the convex peak becomes smaller. are cut away, thereby reducing waviness.
  2. Improve the groove error of ball bearing raceways. Super precision grinding can effectively improve the groove shape error of the raceway by about 30%.
  3. It can generate compressive stress on the surface being ultra-finishing. During the super-fine grinding process, cold plastic deformation mainly occurs, resulting in residual compressive stress on the surface of the workpiece after super-fine grinding.
  4. It can increase the contact area of the working surface of the ferrule. After super fine grinding, the contact support area of the working surface of the ferrule can be increased from 15% to 40% after grinding to 80% to 95%.

Our staff can use the RHBS2080 CNC bearing super precision machine to produce bearing products with higher precision and higher performance, so that the product performance is in the best state, thereby better meeting customer needs.

What are the advantages of split bearings?

Split bearings refer to parts designed and produced by special processes on the basis of integral bearings.

Split bearings have small working resistance, stable operation, and the working temperature can reach 180 degrees Celsius. They are very suitable for places with low

speed,heavy load, large impact force and poor sealing performance. Its biggest advantage is that the bearing can be easily installed and disassembled, which can save a lot of

time and reduce production costs.

Split bearings are suitable for all industrial fields, mainly in converter supports, used in various large-scale conveying equipment, co-casting roller supports, elevators and

conveyors, papermaking machinery and other places that are difficult to unload.

Split bearing design features:

  1. Split spherical roller bearings have a cylindrical inner bore. The inner ring, outer ring and cage with rollers are divided into two halves. The split bearing rings are held together by screws.
  2. The internal design of most split spherical roller bearings is developed from the proven spherical roller bearing E1. The only difference is that some larger bearings have a rigid center rib on the inner race.
  3. These bearings have a split solid cage made of glass fiber reinforced polyamide or brass (to allow for high temperature suitability).
  4. Split spherical roller bearings have the normal tolerances of non-split radial bearings and the normal internal clearance of non-split cylindrical bore spherical roller bearings (DIN 620).
  5. In most split spherical roller bearings, the locking ring is integrated into the inner ring.

what does a bad wheel bearing sound like?

Hub bearings and bearing supports are usually installed between the wheel and the axle.

A wheel bearing is a spherical rolling bearing, usually composed of an inner ring, an outer ring, balls and a cage. They are mounted between the wheel and the axle to support

the rotation of the wheel. Hub bearings usually need to bear a lot of load and friction during driving, so they must be maintained and replaced frequently.

A bearing mount is a bracket that holds a bearing in place and is usually mounted on an axle. They can help stabilize hub bearings and make them easier to install and

maintain. Bearing supports are usually made of cast iron Or made of aluminum, it has enough strength and durability to withstand the vibration and shock during the running of

the vehicle.

In general, the bearings between the wheels and axles are an important part of the normal operation of the vehicle, and their quality and reliability directly affect the

safety and performance of the vehicle. Therefore, in choosing When selecting and replacing hub bearings and bearing supports, high-quality products must be selected, and they

must be installed and maintained correctly in accordance with the manufacturer’s instructions.

So what does a bad wheel bearing sound like?

  1. Symptoms of broken front wheel bearings: After the front wheel bearings of the car are damaged, there will be continuous friction and collision sounds from the corresponding positions of the chassis wheels when driving;
  2. It will cause abnormal friction between the brake hub and the brake pad, which will greatly increase the driving resistance. In severe cases, it will also damage the mechanism of the wheel and cause the wheel hub to fall off.
  3. Symptoms of broken rear wheel bearings: The wheels will shake when the car is running, the vibration of the whole vehicle will increase, and the bearings will be damaged, there will be abnormal noises, and the rolling will not be smooth, resulting in power failure. The biggest impact of this is that the vibration of the car body will intensify, and there will be abnormal noises.

If you find that your car has the above problems, it is recommended that you go to the car shop for repairs in time to avoid accidents!

Where is cylindrical roller bearing used?

Cylindrical rollers and raceways are line contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ferrule is small, which is suitable for high-speed rotation. According to whether the ring has ribs, it can be divided into NU, NJ, NUP, N, NF and other single row cylindrical roller bearings, and NNU, NN and other double row cylindrical roller bearings. The bearing has a detachable inner ring and outer ring.

Cylindrical roller bearings with no ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so they can be used as free end bearings. A cylindrical roller bearing with double ribs on one side of the inner ring and outer ring, and a single rib on the other side of the ring, which can withstand a certain degree of axial load in one direction. Steel stamping cages are generally used, or copper alloy car-made solid cages. But there are also some polyamide shaped cages.

According to whether the ring has ribs, there are single row bearings such as NU, NJ, NUP, N, NF, and double row bearings of NNU and NN. The bearing has a detachable inner ring and outer ring. Cylindrical roller bearings with no ribs on the inner ring or outer ring, the inner ring and outer ring can move relative to the axial direction, so they can be used as free end bearings. Cylindrical roller bearings with double ribs on one side of the inner ring or outer ring and single ribs on the other side of the ring can withstand axial loads in one direction to a certain extent.

Cylindrical roller bearings are suitable for double-supported short shafts with good rigidity, shafts that cause axial displacement due to thermal elongation, and machine parts that need to be separated for installation and disassembly. Mainly used in large motors, machine tool spindles, axle boxes, diesel engine crankshafts, and gearboxes for automobiles and tractors.