deep groove ball bearing

deep groove ball bearing is a kind of rolling bearing widely used in the field of machinery. Its core function is to replace sliding friction by rolling friction to reduce energy loss and wear during equipment operation. This type of bearing is characterized by simple structure and strong adaptability. It is common in scenarios such as motors, fans, water pumps, automobile and motorcycle accessories, and is especially suitable for high-speed and low-noise operation requirements.
Deep groove ball bearings (GB/T 276-2003), formerly known as single row radial ball bearings, are the most widely used rolling bearings. It is characterized by low frictional resistance and high speed. It can be used on parts that bear radial load or combined radial and axial load at the same time. It can also be used on parts that bear axial load, such as low-power motors, Automobile and tractor gearbox, machine tool gearboxes, general machines, tools and other Chinese names deep groove ball bearings mbth Deep groove ball bearing inner diameter size 10mm ~ 1320m outer diameter ruler 30mm ~ 1600mm width size 9mm ~ 300mm acting on supporting rotating parts, reducing friction properties of basic parameters
Deep groove ball bearings are the most common type of rolling bearings.
The basic deep groove ball bearing consists of an outer ring, an inner ring, a set of steel balls and a set of cages. There are two types of deep groove ball bearings: single row and double row. The deep groove ball structure is also divided into two types: seal and open structure. Open type refers to the bearing without seal structure. Sealed deep groove ball is divided into dust seal and oil seal. The dust-proof sealing cover is stamped from steel plate, which simply prevents dust from entering the bearing raceway. The oil-proof type is a contact type oil seal, which can effectively prevent the grease in the bearing from overflowing.
deep groove ball bearing

single row deep groove ball bearing type code 6, double row deep groove ball bearing code 4. Its structure is simple, easy to use, is the most common production, the most widely used type of bearing.
Executive standard for deep groove ball bearings [1]
Working principle
Deep groove ball bearings mainly bear radial load, but also can bear radial load and axial load. When it is subjected to only radial load, 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 a large axial load. The friction coefficient of the deep groove ball bearing is very small, and the 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 bear radial load, but when the radial clearance of the bearing is increased, it has the performance of a certain angular contact ball bearing and can bear the combined load of diameter and axis. When the speed is high and it is not suitable to use thrust ball bearings, it can also be used to bear pure axial load. Compared with other types of bearings with the same size of deep groove ball bearings, the friction coefficient of such bearings is small and the limit speed is high. But not impact resistant, not suitable for heavy load. [2]
Deep groove ball bearing installed on the shaft, in the bearing axial clearance range, can limit the axial displacement of the shaft or housing in two directions, so it can be in two directions for axial positioning. In addition, this type of bearing also has a certain degree of self-aligning ability. When inclined relative to the housing hole by 2 & prime;~ 10 & prime;, it can still work normally, but it has a certain impact on the life of the bearing.
Structure and classification Bearing construction
Deep groove ball bearings have a simple structure and are easy to achieve high manufacturing accuracy compared with other types, so they are convenient for series mass production, low manufacturing costs, and extremely common use. Deep groove ball bearings in addition to the basic type, there are various variants of the structure, such as: with dust cover of the deep groove ball bearings, with a rubber seal ring of the deep groove ball bearings, a stop groove of the deep groove ball bearings, loaded ball gap of the large load capacity of the deep groove ball bearings, double row deep groove ball bearings.
Bearing type
Deep groove ball bearings are mainly used to bear radial loads, but they are also commonly used to bear radial and axial composite loads. In particular, when the speed of mechanical equipment is very high and it is not suitable to use thrust bearings, the bearings can be used to bear two-way pure axial loads without maintenance during work. Deep groove ball bearing models are: deep groove ball bearing (60000 type); Deep groove ball bearing with stop groove on outer ring (60000N type); Deep groove ball bearing with dust cover on one side and stop groove on outer ring on the other side (60000-ZN type); Deep groove ball bearing with dust cover on both sides and stop groove on outer ring (60000-2ZN type); Deep groove ball bearing with dust cover on one side (60000-Z type); deep groove ball bearings with sealing ring on one side (60000-LS type and 60000-RZ type); Deep groove ball bearings with sealing rings on both sides (60000-2LS type and 60000-2RZ type); Flanged outer ring deep groove ball bearing (F60000 type); Flanged outer ring deep groove ball bearing with dust cover on one side (F60000-Z type); There are 11 kinds of flanged outer ring deep groove ball bearings with dust cover on both sides (F60000-2Z type). [2]
According to the size of deep groove ball bearings can be divided:
(1) Miniature bearings-bearings with a nominal outer diameter of 26mm or less;
(2) Small bearings-bearings with a nominal outer diameter of 28-55mm;
(3) Small and medium-sized bearings-bearings with a nominal outer diameter of 60-115mm;
(4) Medium and large bearings-bearings with a nominal outer diameter range of 120-190mm
(5) Large bearings-bearings with a nominal outer diameter of 200-430mm;
(6) Extremely large bearings-bearings with a nominal outer diameter of 440mm or more.
processing form
The processing forms of deep groove ball bearing parts are as follows:
1. Multi-process processing: General bearing production requires 20-40 processes, with more than 70 processes.
2, molding: the working surface of the bearing parts are rotary molding surface, suitable for molding processing.
3, precision machining: most of the surface of the bearing parts to go through grinding, grinding size and geometric accuracy are in m units.
Application Deep groove ball bearings can be used in gearbox, instrumentation, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, construction machinery, roller skates, yo-yo, etc.
Installation Method
Deep groove ball bearing installation method 1: press fit: when the inner ring of the bearing is tightly fitted with the shaft, and the outer ring is loosely fitted with the bearing seat hole, the bearing can be press-fitted on the shaft first, and then the shaft together with the bearing is fitted into the bearing seat hole. during press-fitting, an assembly sleeve (copper or mild steel) made of soft metal material is padded on the end face of the bearing inner ring, and the bearing outer ring, when the inner ring and the shaft are loosely matched, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and seat hole, the inner ring and outer ring in the installation chamber should be pressed into the shaft and seat hole at the same time, and the structure of the assembly sleeve should be able to hold the end faces of the inner ring and outer ring of the bearing at the same time.
Deep groove ball bearing installation method two: heating fit: by heating the bearing or bearing seat, the use of thermal expansion will be tight fit into a loose fit installation method. Is a common and labor-saving installation method. This method is suitable for the installation of bearings with large interference. Before hot installation, put the bearing or the ring of the separable bearing into the oil tank and evenly heat it at 80-100 ℃, then take it out of the oil and install it on the shaft as soon as possible. In order to prevent the end face of the inner ring and the shaft shoulder from not tightly fitting after cooling, the bearing can be axially tightened after cooling. When the outer ring of the bearing is tightly matched with the bearing seat made of light metal, the hot loading method of heating the bearing seat can be used to prevent the mating surface from being scratched. When the oil tank is used to heat the bearing, there shall be a grid at a certain distance from the bottom of the box, or the bearing shall be hung with a hook. The bearing shall not be placed on the bottom of the box to prevent impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank, and the oil temperature shall not exceed 100 ℃ strictly to prevent tempering effect and reduce the hardness of the ferrule.
Tolerance
Standard deep groove ball bearings with ordinary level, all in line with GB/T 307.3-1996. [2]
Clearance
The radial clearance of the bearing is divided into the original clearance, the installation clearance and the working clearance. Generally, the original radial clearance of the bearing is greater than the clearance when the bearing is working. The clearance is an important technical parameter of the bearing, which directly affects the technical performance of the bearing, such as load distribution, vibration, noise, friction, service life and mechanical motion accuracy. Strictly speaking, the dynamic load rating of the bearing changes with the size of the clearance. The rated loads (C and C0) listed in the product samples are the load values when the working clearance is zero. Excessive clearance will cause the internal bearing area of the bearing to decrease, the stress on the rolling contact surface will increase, the movement accuracy of the bearing will decrease, the vibration and noise will increase, and the service life of the bearing will be shortened: if the clearance is too small, it will cause heat and temperature, and even It will cause the bearing to "seize" during operation. Therefore, it is very important to choose different levels of bearing clearance according to the type of bearing and working conditions.
Standard deep groove ball bearings with C2, standard (CN), C3, C4 and C5 internal clearance, all in line with GB4604. The radial clearance of deep groove ball bearings is shown in the table below. [2]
Radial clearance table for deep groove ball bearings
Radial clearance table for deep groove ball bearings
Cage
Deep groove ball bearings generally use steel plate stamping cage or brass solid cage. When the outer diameter is less than 400mm, the steel plate stamping cage is adopted without the rear code. When the outer diameter is greater than 400mm, the brass solid cage is mostly used without the rear code.
Precautions Deep groove ball bearings, bearing load in operation is too small, will make the ball and the sliding between the raceway, become the cause of abrasion. In particular, large deep groove ball bearings with large ball and cage weight have this tendency. In many cases, the bearing will be corroded, and there are many reasons for bearing corrosion. The most common factors in our daily life are the following:
1) Due to poor sealing device, it is invaded by moisture, dirt, etc;
2) The bearing is not used for a long time, exceeds the anti-rust period, and lacks maintenance.
3) metal surface roughness is larger;
4) Contact with corrosive chemical media, the bearing is not cleaned clean, the surface is contaminated with dirt, or the bearing is touched with sweat. After the bearing is cleaned, it is not packaged or installed in time, and it is exposed to the air for a long time, and it is attacked and contaminated by air moisture;
5) Ambient temperature and humidity and contact with various environmental media; rust inhibitor failure or quality does not meet the requirements.
Appendix 1. Code and Representation Method of Rolling Bearing
According to GB/T 272-1993 rolling bearing code and representation are as follows:
Composition of bearing code: bearing code consists of basic code, pre-code and post-code.
(1) Basic code The basic code indicates the basic type, structure and size of the bearing, which is the basis of the bearing code.
Basic code of rolling bearing (except needle roller bearing): the external dimension of the bearing conforms to the external dimension specified in any standard of GB 273.1, GB 273.2, GB 273.3 and GB 3882, and its basic code consists of bearing type code, size series code and inner diameter code.
Basic code of rolling bearing (except needle roller bearing)
(2) Front and rear codes Front and rear codes are supplementary codes added around the basic code when the structural shape, size, tolerance, technical requirements, etc. of the bearing are changed.
Basic code of rolling bearing (except needle roller bearing)
Basic code of rolling bearing (except needle roller bearing)
Post code preparation rules:
A. the post code is placed on the right side of the basic code and half a Chinese character distance from the basic code (except for the symbols "-" and "/" in the code). When there are many changed items, there are multiple sets of post codes, which are arranged from left to right as listed in Table 3-114.
B after changing to 4 groups (including 4 groups), use "/" before its code to separate it from the previous code; Example: 6205-2Z/P6 22308/P63.
C. change the content to the two groups after group 4. when the meanings of numbers or characters in the codes of the front group and the back group may be confused, there is half a Chinese character distance between the two codes. Example: 6208/P63 V1
Deep groove ball suffix meaning
. 1.
CN: Normal group radial clearance; usually only used in combination with the following letters to indicate a narrow or offset clearance range
.
Kan
H: Narrowed clearance range, equivalent to the upper half of the original clearance range
Kan
Kan
L: Narrowed clearance range, equivalent to the lower half of the original clearance range
Kan
Kan
P: offset clearance range, which is equivalent to the composition of the upper half of the original clearance range and the lower half of the next clearance range. The above letters are also applicable to the corresponding meanings combined with the following clearance groups: C2, C3, C4, and C5, such as C2
Kan
. 2.
C2: Radial clearance less than normal group
.
. 3.
C3: Radial clearance is greater than normal group
.
. 4.
C4: Radial clearance greater than C3
.
. 5.
C5: Radial clearance greater than C4
.
. 6.
DB: Two single row deep groove ball bearings paired back-to-back
.
. 7.
DF: Two single row deep groove ball bearings paired in a face-to-face manner
.
. 8.
DT: Two single row deep groove ball bearings paired in series
.
. 9.
E: Enhanced design
.
. 10.
GJN: Polyurea grease, NLGI consistency 2, temperature range -30 to 150 degrees (standard filling)
.
. 11.
GXN: Polyurea grease, NLGI consistency 2, temperature range -40 to 150 degrees (standard filling)
.
. 12.
J: Stamped steel cage
.
. 13.
LHT23: Lithium grease, NLGI consistency 2, temperature range -50 to 140 degrees (standard filling)
.
. 14.
LT: Lithium grease, NLGI consistency 2, temperature range -55 to 110 degrees (standard filling)
.
. 15.
LT10: Lithium grease, NLGI consistency 2, temperature range -50 to 90 degrees (standard fill charge)
.
. 16.
M: Machine-cut brass cage, steel ball guide. Different designs and materials are marked with numbers after M, such as M2
.
. 17.
MA: Machine-cut brass cage, outer ring guide
.
. 18.
MB: Machine-cut brass cage, inner ring guide
.
. 19.
MT33: Lithium grease, NLGI consistency 3, temperature range -30 to 120 degrees (standard filling)
.
. 20.
MT47: Lithium grease, NLGI consistency 2, temperature range -30 to 110 degrees (standard filling)
.
. 21.
N: Outer ring with stop groove
.
. 22.
NR: Outer ring with stop groove and stop ring
.
. 23.
N1: There is a groove on the side of the outer ring (used to cooperate with the stop device to prevent the outer ring from rotating)
.
. 24.
P5: Dimensional accuracy and rotation accuracy conform to ISO tolerance level 5
.
. 25.
P6: Dimensional accuracy and rotational accuracy in accordance with ISO tolerance class 6
.
. 26.
P52:P5 C2
.
. 27.
P62:P6 C2
.
. 28.
P63:P6 C3
.
. 29.
RS1: Nitrile diene rubber (NBR) contact seal with steel skeleton on one side
.
. 30.
RSH: Nitrile diene rubber (NBR) contact seal with steel skeleton on one side
.
. 31.
RSL: Nitrile diene rubber (NBR) low friction seal with steel skeleton on one side
.
. 32.
RZ: Nitrile diene rubber (NBR) low friction seal with steel skeleton on one side
.
. 33.
TH: fiber reinforced phenolic resin cage (card type)
.
. 34.
TN: Injection molded nylon cage
.
. 35.
TN9: injection glass fiber reinforced nylon 6,6 cage
.
. 36.
VL0241: outer ring with alumina coating, insulation capacity up to 1000VDC
.
. 37.
VL2071: The outer surface of the inner ring is coated with alumina, and the insulation capacity is up to 1000VDC
.
. 38.
WT: Polyurea grease, NLGI consistency 2, temperature range -40 to 160 degrees (standard filling)
.
. 39.
Y: Stamped copper cage
.
. 40.
Z: side with stamped steel dust cover
.
. 41.
ZNR: outer ring with stop groove and stop ring, the other side of the stop groove with stamped steel dust cover
.
. 42.
2RS1: Nitrile rubber (NBR) contact seals with steel skeleton on both sides
.
. 43.
2RSH: Nitrile Butadiene Rubber (NBR) contact seals with steel skeleton on both sides
.
. 44.
2RSL: Nitrile Butadiene Rubber (NBR) low friction seals with steel frame on both sides
.
. 45.
2RZ: Nitrile rubber (NBR) low-friction seals with steel skeleton on both sides
.
. 46.
2Z: Stamped steel dust cover on both sides
.
. 47.
2ZNR: Outer ring with stop groove and stop ring, with stamped steel dust cover on both sides
.
commonly used with ball loading notch suffix:
. 1.
C3