Deep groove ball bearing|Rolling bearing|Roller bearing|Bearing

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Deep Groove Ball Bearing

Deep groove ball bearing (GB/T 276-2003) was originally named single row radial ball bearing, which is the most widely used rolling bearing. It is characterized by low friction resistance and high speed. It can be used on parts that bear radial load or combined load of radial and axial load at the same time, and can also be used on parts that bear axial load, such as small power motors, automobile and tractor gearboxes, machine tool gearboxes, general machines, tools, etc.

Bearing structure
Deep groove ball bearings have a simple structure and are easy to achieve higher manufacturing precision than other types, so they are easy to produce in series and in large quantities, and the manufacturing cost is also low. They are very commonly used. In addition to the basic type, deep groove ball bearings also have various variant structures, such as deep groove ball bearings with dust covers, deep groove ball bearings with rubber seals, deep groove ball bearings with retaining grooves, deep groove ball bearings with large load capacity and ball notches, and double row deep groove ball bearings.

Bearing type
Deep groove ball bearings are mainly used to bear radial loads, but are also often used to bear radial and axial combined loads. Especially when the mechanical equipment has a very high rotation speed and thrust bearings are not suitable, this bearing can be used to bear bidirectional pure axial loads and requires no maintenance during operation. It is a low-priced and widely used bearing. The deep groove ball bearing models are: deep groove ball bearing (60000); deep groove ball bearing with a retaining groove on the outer ring (60000N); deep groove ball bearing with a dust cover on one side and a retaining groove on the outer ring on the other side (60000-ZN); deep groove ball bearing with dust covers on both sides and a retaining groove on the outer ring (60000-2ZN); deep groove ball bearing with a dust cover on one side (60000Z); deep groove ball bearing with dust covers on both sides (60000-2Z); deep groove ball bearing with a seal on one side (60000-LS, 60000-RZ); deep groove ball bearing with seals on both sides (60000-2LS, 60000-2RZ); deep groove ball bearing with flange outer ring (F60000); deep groove ball bearing with flange outer ring and dust cover on one side (F60000-Z); flanged outer ring deep groove ball bearing with dust cover on both sides (F60000-2Z), a total of 11 types.

All the above models are sold by our company. If you need a specific model, please consult.

Needle Bearing

Deep groove ball bearings (GB/T 276-2003), formerly known as single row radial ball bearings, are the most widely used type of rolling bearings. Its characteristics are low frictional resistance, high rotational speed, and can be used on components that can withstand radial loads or combined loads of radial and axial forces. It can also be used on components that can withstand axial loads, such as low-power motors, car and tractor gearboxes, machine tool gearboxes, general machines, tools, etc.

Basic parameters

Deep groove ball bearings are the most common type of rolling bearings.
The basic type of deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls, and a set of retaining structures. There are two types of deep groove ball bearings: single row and double row. The deep groove ball structure is also divided into sealed and open types. Open type refers to bearings without a sealed structure, while sealed deep groove balls are divided into dust-proof and oil proof seals. The dustproof sealing cover material is stamped steel plate, which only plays a simple role in preventing dust from entering the bearing raceway. The oil proof type is a contact type oil seal, which can effectively prevent the lubricating grease inside the bearing from overflowing.
The type code for single row deep groove ball bearings is 6, and the code for double row deep groove ball bearings is 4. Its structure is simple and easy to use, making it the most commonly produced and widely used type of bearing.

Cylindrical Roller Bearings

Needle 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 having a small 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 its inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, making it particularly suitable for support structures with limited radial installation dimensions.

According to different usage scenarios, bearings without inner rings or needle rollers and cage components can be selected. At this time, the journal surface and outer shell hole surface that match the bearing are directly used as the inner and outer rolling surfaces of the bearing. To ensure the same load capacity and operating performance as bearings with ring rings, the hardness, processing accuracy, and surface quality of the shaft or outer shell hole raceway surface should be similar to those of the bearing ring raceway. This type of bearing can only withstand radial loads.

Tapered Roller Bearing

Conical roller bearings belong to separable bearings, and both the inner and outer rings of the bearing have conical raceways. This type of bearing is divided into different structural types such as single row, double row, and four row tapered roller bearings according to the number of roller rows installed. Single row tapered roller bearings can withstand radial loads and unidirectional axial loads. When a bearing is subjected to radial load, an axial force component will be generated, so another bearing that can withstand the opposite axial force is needed to balance it.

Conical roller bearings refer to radial thrust rolling bearings with conical rollers as the rolling elements. There are two types: small cone angle and large cone angle. The small cone angle mainly bears the combined radial and axial loads, which are mainly radial loads. It is often used in pairs and installed in reverse. The inner and outer race rings can be installed separately, and the radial and axial clearances can be adjusted during installation and use; The large cone angle mainly bears axial and radial combined loads, mainly axial loads. It is generally not used alone to bear pure axial loads, but can be used to bear pure radial loads when configured as a pair (with the same end installed relative to each other).

The ability of a single row tapered roller bearing to withstand axial loads depends on the contact angle, which is the angle of the outer raceway. The larger the angle, the greater the axial load capacity. The most commonly used tapered roller bearing is the single row tapered roller bearing. In the front wheel hub of the sedan, small-sized double row tapered roller bearings are used. Four row tapered roller bearings are used in heavy machinery such as large cold and hot rolling mills.

Linear Bearing

Linear bearing: Metal linear bearing is a low-cost linear motion system designed for use with infinite travel and cylindrical shafts. Widely used as sliding parts in industrial machinery such as precision machine tools, textile machinery, food packaging machinery, printing machinery, etc

Introduction:

Linear bearings are a type of linear motion system used in conjunction with cylindrical shafts for linear travel. Due to the contact between the bearing ball and the outer sleeve of the bearing, the steel ball rolls with minimal frictional resistance. Therefore, linear bearings have low friction, are relatively stable, and do not change with the bearing speed. They can achieve stable linear motion with high sensitivity and accuracy. The consumption of linear bearings also has its limitations, mainly due to the poor impact load capacity and load-bearing capacity of the bearings. Secondly, linear bearings experience significant vibration and noise during high-speed motion. The automatic selection of linear bearings is included. Linear bearings are widely used as sliding components in industrial machinery such as precision machine tools, textile machinery, food packaging machinery, printing machinery, etc

Due to the contact between the bearing ball and the bearing point, a small load is used. The steel ball rotates with minimal frictional resistance, allowing for high-precision and smooth motion.

Plastic linear bearings are a self-lubricating linear motion system, and their biggest difference from metal linear bearings is that metal linear bearings have rolling friction and point contact with cylindrical shafts, making them suitable for low load high-speed motion; Plastic linear bearings have sliding friction and are in surface contact with cylindrical shafts, making them suitable for high load and low-speed motion.

Ceramic Bearings

Ceramic bearings - equipment used in aviation, aerospace, navigation, and petroleum industries
Ceramic bearings, as an important mechanical component, are at the forefront of the new materials world due to their excellent performance that metal bearings cannot match, such as high temperature resistance and super strength. In the past decade, it has been increasingly widely applied in various fields of national economy and people's livelihood.

Advantages: 1. Due to the fact that ceramics are almost not afraid of corrosion, ceramic rolling bearings are suitable for operation in harsh conditions filled with corrosive media. 2. Due to the lower density and lighter weight of ceramic rolling balls compared to steel, the centrifugal effect on the outer ring during rotation can be reduced by 40%, thereby greatly extending their service life. 3. Ceramics are less affected by thermal expansion and contraction than steel, so when the clearance between bearings is constant, bearings can be allowed to work in environments with significant temperature differences. 4. Due to the higher elastic modulus of ceramics compared to steel, they are less prone to deformation under stress, which is beneficial for improving working speed and achieving higher accuracy.

Ceramic bearings have characteristics such as high temperature resistance, cold resistance, wear resistance, corrosion resistance, resistance to magnetic and electrical insulation, oil-free self-lubricating, and high speed. Can be used in extremely harsh environments and special working conditions.

Ceramic bearings can be divided into: zirconia with retainer ceramic bearings, silicon nitride with retainer ceramic bearings, and composite with retainer ceramic bearings. The retainer material for general ceramic bearings is polytetrafluoroethylene (PTFE) as the standard configuration, and glass fiber reinforced nylon 66 (GRPA66-25), special engineering plastics (PEEK, PI), stainless steel (SUS316, SUS304), brass (Cu), etc. can also be used. Ceramic material retainers are still rarely used due to difficulties in pocket hole processing, molding technology, and other related issues; Due to the material limitations of the retainer, non retainer zirconia full ball all ceramic bearings, silicon nitride full ball all ceramic bearings, and composite full ball ceramic bearings have been developed for special use scenarios.

The main components of ceramic bearings, including the inner and outer rings and rolling elements, are mostly made of ceramic materials, which are defined as ceramic bearings; If some of the inner and outer rings and rolling elements of the bearing are not made of ceramic materials, we define it as a hybrid ceramic bearing. The widely used hybrid ceramic bearings are ball bearings made of ceramic materials called ceramic ball bearings, which can be divided into zirconia ceramic ball bearings and silicon nitride ceramic ball bearings.

08.26.2024

Introduction to the properties, working principles and performance of deep groove ball bearings

Deep groove ball bearings (GB/T 276-2003), originally listed as radial ball bearings, are the most widely used type of rolling bearing.It is characterized by low frictional resistance and high speed, and can be used on parts that bear radial loads or combined loads acting simultaneously in both the radial and axial directions. It can also be used on parts that bear axial loads, such as small-power motors, automotive and tractor transmissions, machine tool gearboxes, general machines, tools, etc. Nature Deep groove ball bearings are the most common type of rolling bearing. Deep groove ball bearings The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a retainer.Deep groove ball bearings are available in single-row and double-row designs. The deep groove ball structure is further categorized into sealed and open types. Open type refers to bearings without a sealing mechanism, while sealed deep groove balls are divided into dustproof seals and oil-resistant seals.The dust-proof sealing cover is made of steel plate stamping, which only plays a simple role in preventing dust from entering the bearing raceway.The oil-proof type is a contact oil seal, which can effectively prevent the lubricating grease in the bearing from overflowing. The type code for single-row deep groove ball bearings is 6, and the type code for double-row deep groove ball bearings is 4.It is a simple structure and easy to use, making it the most common and widely used type of bearing in production. Working principle Deep groove ball bearings mainly withstand radial loads, and can also simultaneously withstand both radial and axial loads.When it is subjected to radial load only, the contact angle is zero.When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can withstand high axial loads. The friction coefficient of the deep groove ball bearing is very small and its limit speed is also very high. Bearing characteristics Deep groove ball bearings are the most commonly used rolling bearings.Its structure is simple and easy to use.It is mainly used to withstand radial loads, but when the bearing's radial clearance is increased, it has some of the performance of angular contact ball bearings and can withstand combined radial and axial loads.When the speed is high and it is not suitable to use thrust ball bearings, it can also be used to withstand pure axial loads.Compared with other types of bearings having the same specifications and dimensions as deep groove ball bearings, this type of bearing has a small friction coefficient and high limit speed.However, it is not resistant to impact and unsuitable for heavy loads. [2] After the deep groove ball bearing is installed on the shaft, it can limit the axial displacement of both directions of the shaft or housing within the range of its axial clearance. Therefore, it can be used for bidirectional axial positioning.In addition, this type of bearing also has a certain self-aligning ability. When tilted by 2' to 10' relative to the housing hole, it can still work normally, but there is some impact on the life of the bearing. Structure and classification Bearing structure Deep groove ball bearings have a simple structure and are easier to achieve high manufacturing accuracy compared with other types, so they are easy to mass produce in series. The manufacturing cost is also low and the use is extremely common.In addition to the basic type, there are various modified structures of deep groove ball bearings, such as deep groove ball bearings with dust covers, deep groove ball bearings with rubber seals, deep groove ball bearings with stop grooves, deep groove ball bearings with large load capacity and ball installation gaps, and double-row deep groove ball bearings. Bearing type Deep groove ball bearings are mainly used to withstand radial loads, but they are also often used to withstand combined radial and axial loads.Especially when the speed of mechanical equipment is very high and thrust bearings are not suitable, this bearing can be used to withstand bidirectional pure axial loads without maintenance during operation. It is a low-cost, widely used type of bearing.Deep groove ball bearing models include: deep groove ball bearings (60000 type);Deep groove ball bearing with stopper slot on the outer ring (60000N type);Deep groove ball bearing (60000-ZN type) with dust cover on one side and stopper groove on the outer ring of the other side;Deep groove ball bearing with dust cover on both sides and stopper slot in the outer ring (60000-2ZN type);Deep groove ball bearing with dust cover on one side (60000Z type);Deep groove ball bearing with dust cover on both sides (60000-2Z type);Deep groove ball bearings with seal rings (60000-LS type, 60000-RZ type);Deep groove ball bearings with sealing rings on both sides (60000-2LS type, 60000-2RZ type);Flange outer ring deep groove ball bearing (F60000 type);One flange outer ring deep groove ball bearing with dust cover (F60000-Z type);There are 11 types of deep groove ball bearings (F60000-2Z type) with flanges on both sides and dust covers. According to the size of deep groove ball bearings, they can be divided into: (1) Miniature bearings - bearings with a nominal outer diameter size range of less than 26mm; (2) Small bearing - the nominal outer diameter size range is 28-55mm; (3) Small and medium-sized bearings - bearing with a nominal outer diameter ranging from 60 to 115mm; (4) Medium and large bearings - bearing with a nominal outer diameter ranging from 120 to 190mm (5) Large bearings - bearings with a nominal outer diameter ranging from 200-430mm; (6) Extra-large bearing - a bearing with a nominal outer diameter size range of 440mm or more. Processing form The processing forms of deep groove ball bearing parts are as follows: Multi-process machining: Generally, bearing production requires 20 to 40 processes, with up to more than 70. 2. Molding process: The working surfaces of bearing parts are all rotary molding surfaces, which are suitable for processing using the molding method. 3. Precision machining: Most of the surfaces of bearing parts are subjected to grinding, and the dimensions and geometric accuracy of the grinding process are measured in micrometers (μm). Usage Application Deep groove ball bearings can be used in gearboxes, instruments and meters, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, roller skates, yo-yos, etc Installation method Deep groove ball bearing installation method 1: Press-fit: When the inner ring of the bearing is tightly fitted to the shaft and the outer ring is loosely fitted to the bearing seat hole, a press can be used to first press fit the bearing onto the shaft. Then, the shaft along with the bearing should be installed into the bearing seat hole. During this process, a soft metal material (such as copper or mild steel) should be placed on the end face of the inner ring of the bearing for assembly purposes. If the outer ring of the bearing fits tightly to the bearing seat hole while the inner ring has a loose fit with the shaft, the bearing can be pressed into the bearing seat hole first. At this point, the outside diameter of the assembly sleeve should be slightly smaller than that of the seat holeIf the bearing ring is tightly fitted with both the shaft and the seat hole, the inner and outer rings should be pressed into the shaft and seat hole simultaneously. The assembly sleeve structure should be able to compress the end faces of the inner and outer rings of the bearing at the same time. Deep groove ball bearing installation method 2: heating fit: an installation method that uses heat expansion to convert a tight fit into a loose fit by heating the bearing or bearing housingIt is a common and labor-saving installation methodThis method is suitable for the installation of bearings with large interference. Before hot assembly, place the bearing or separable bearing ring in an oil tank and heat it evenly at 80-100℃. Then remove it from the oil and install it on the shaft as soon as possible. To prevent the inner ring end face and shaft shoulder from not fitting tightly after cooling, axial tightening can be performed again after the bearing cools downWhen the outer ring of bearing is tightly fitted with light metal bearing seat, the hot charging method for heating the bearing seat can be used to avoid scratching on the fitting surface.When heating the bearing with an oil tank, there should be a mesh grid at a certain distance from the bottom of the tank. Alternatively, use hooks to suspend the bearing so that it cannot rest on the bottom of the tank. This prevents foreign matter from entering the bearing or uneven heating. The oil tank must have a thermometer and strictly control the temperature not exceeding 100℃ to prevent backfire effects and reduce the hardness of the ring. tolerance The standard deep groove ball bearings are of ordinary grade and all comply with GB/T 307.3-1996. Clearance The radial clearance of the bearing is divided into original clearance, installation clearance and working clearance.Generally, the original radial clearance of a bearing is greater than its working clearance.Clearance is an important technical parameter of bearings, which directly affects the bearing's load distribution, vibration, noise, friction, service life and mechanical motion accuracy.Strictly speaking, the rated dynamic load of a bearing varies with the size of its clearance.The rated loads (C and C0) listed in the product sample are load values when the working clearance is zero.Excessive clearance can lead to a reduction in the load-bearing area within the bearing, an increase in rolling contact surface stress, a decrease in the accuracy of the bearing's motion, increased vibration and noise, and a shortened service life of the bearing. If the clearance is too small, it can cause heating and temperature rise, and even lead to "seizure" during operation.Therefore, it is important to select different grades of bearing clearance according to the type and working conditions of the bearings. Radial clearance table of deep groove ball bearings Standard deep groove ball bearings have internal clearances of C2, standard (CN), C3, C4 and C5 grades, all in accordance with GB4604.The radial clearance of deep groove ball bearings is shown in the following table Keep the shelf Deep groove ball bearings generally use steel plate stamped cages or brass solid cages.When the outer diameter is less than 400 mm, a steel plate stamped cage without post-code is used. When the outer diameter exceeds 400 mm, a brass solid cage without post-code is preferred. Matters needing attention In the operation of deep groove ball bearings, if the bearing load is too small, it can cause slippage between the balls and raceways, leading to scratches.This tendency is especially pronounced in large deep groove ball bearings with heavy balls and cages.In many cases, bearings will rust. There are many reasons for bearing corrosion, and the most common ones in our daily life include: 1) Due to poor sealing, it is invaded by moisture and dirt; 2) The bearing is not used for a long time, exceeding the rust prevention period and lacking maintenance. 3) The metal surface roughness is large; 4) Contact with corrosive chemical media, the bearing is not cleaned thoroughly and there are contaminants on its surface. Or, if the bearings are touched by sweaty hands after cleaning, they are not packaged or installed promptly and are exposed to air for a long time, which can lead to moisture intrusion and contamination from the air; 5) Environmental temperature and humidity, as well as exposure to various environmental media;The rust preventative has lost its effectiveness or fails to meet the required quality standards. Union Trade Tech. Co., Ltd. is extracted from Baidu Encyclopedia,

Union Trade Tech. Co.,Ltd

Basic parameters

Introduction: