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Deep groove ball bearing

January 16, 2020

Deep groove ball bearing , formerly single row radial ball bearing, is the most widely used rolling bearing. It is characterized by small friction resistance and high rotation speed. It can be used for parts bearing radial load or combined load of radial and axial simultaneously, and also for parts bearing axial load, such as small power motor, gearbox of automobile and tractor, gearbox of machine tool, general machine, tool, etc.

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Deep groove ball bearings are the most common type of rolling bearing.
Deep groove ball bearing
Deep groove ball bearings (7 photos)
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: sealed and open. seal. The dust seal cover material is stamped from a steel plate, which simply prevents dust from entering the bearing raceway. The oil-proof type is a contact oil seal, which can effectively prevent the grease in the bearing from overflowing.
The single row deep groove ball bearing is coded as 6, and the double row deep groove ball bearing is coded as 4. Its simple structure and convenient use make it the most popular and widely used bearing.

working principle
Deep groove ball bearings mainly bear radial load, and can also bear radial load and axial load at the same time. When it is only subjected to radial loads, the contact angle is zero. When a 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 deep groove ball bearing has a small friction coefficient and a high limit speed.
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 loads, but when the bearing radial clearance is increased, it has a certain angular contact ball bearing performance and can bear combined radial and axial loads. It can also be used to bear pure axial load when the speed is high and the thrust ball bearing is not suitable. Compared with other types of bearings with the same specifications as deep groove ball bearings, this type of bearing has a small friction coefficient and high limiting speed. But it is not resistant to impact and is not suitable for heavy loads. [2]
After the deep groove ball bearing is installed on the shaft, the axial displacement of the shaft or the housing can be limited in the axial clearance of the bearing, so it can be axially positioned in both directions. In addition, this type of bearing also has a certain self-aligning ability. When it is inclined 2 ′ to 10 ′ relative to the housing hole, it can still work normally, but it has a certain impact on the bearing life.
Structure and classification
Bearing construction
Deep groove ball bearings have a simple structure and are easy to achieve higher manufacturing accuracy than other types, so they are convenient for mass production in series, the manufacturing cost is low, and they are extremely common. In addition to the basic type, deep groove ball bearings have various modified structures, such as: deep groove ball bearings with dust cover, deep groove ball bearings with rubber seals, deep groove ball bearings with retaining grooves, and Deep groove ball bearing with ball notch and large load capacity, double row deep groove ball bearing.
Bearing type
Deep groove ball bearings are mainly used to support radial loads, but they are also commonly used to support combined radial and axial loads. In particular, when the speed of mechanical equipment is very high, it is not suitable to use thrust bearings. This bearing can be used to bear bidirectional pure axial load, and it requires no maintenance during work. It is a low-cost and versatile bearing. Deep groove ball bearing models are: deep groove ball bearing (60000 type); deep groove ball bearing with outer groove (60000N type); deep groove ball with dust cover on one side and stop groove on the other side Bearing (60000-ZN type); Deep groove ball bearing (60000-2ZN type) with dust cover on both sides and retaining groove on the outer ring; Deep groove ball bearing (60000Z type) with dust cover on one side; Both Deep groove ball bearing with dust cover (60000-2Z type); deep groove ball bearing with sealing ring on one side (60000-LS type, 60000-RZ type); deep groove ball bearing with sealing ring on both sides (60000- 2LS type, 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 types of flanged outer ring deep groove ball bearings (F60000-2Z). [2]
According to the size of deep groove ball bearings, they can be divided into:
(1) Miniature bearings-bearings with a nominal outer diameter range of 26 mm or less;
(2) Small bearings-bearings with a nominal outer diameter range of 28-55mm;
3 (3) Small and medium-sized bearings-bearings with a nominal outer diameter range of 60-115mm;
(4) Medium and large bearings ---- bearings with a nominal outer diameter range of 120-190mm
5 (5) Large-sized bearings-bearings with a nominal outer diameter range of 200-430mm;
(6) Extra large bearings ---- bearings with a nominal outer diameter range of 440mm or more.
Processing form
The processing form of deep groove ball bearing parts is as follows:
1. Multi-process processing: General bearing production requires 20-40 processes, and more than 70 processes.
2, molding processing: The working surfaces of the bearing parts are all rotary molding surfaces, which are suitable for processing by the molding method.
3. Precision processing: Most of the surfaces of bearing parts are subjected to grinding processing. The grinding processing size and geometric accuracy are in μm.
Application Editing
Deep groove ball bearings can be used in gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, construction machinery, roller roller skates, yo-yo, etc.
installation method
Deep groove ball bearing installation method 1: Press-fit: When the inner ring of the bearing and the shaft fit tightly, the outer ring and the bearing seat hole are loosely fitted, the bearing can be press-fitted on the shaft with a press, and then the shaft and the bearing They are installed together in the bearing housing hole. On the end face of the bearing inner ring during press-fitting, an assembly sleeve (copper or soft steel) made of soft metal material is cushioned. The bearing outer ring and the bearing housing hole are tightly fitted. The inner ring and the shaft are For a loose fit, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the mounting sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly fitted with the shaft and the seat hole, install the inner ring and The outer ring should be pressed into the shaft and the seat hole at the same time. The structure of the assembly sleeve should be able to tighten the end faces of the inner ring and the outer ring of the bearing at the same time.
Deep groove ball bearing installation method 2: heating fit: by heating the bearing or bearing seat, the thermal expansion is used to convert the tight fit into a loose fit. It is a commonly used and labor-saving installation method. This method is suitable for large interference. For the installation of bearings, put the bearing or separable bearing ring into the oil tank and evenly heat it at 80-100 ℃ before hot-loading, and then remove it from the oil and install it on the shaft as soon as possible. The fitting is not tight, and the bearing can be axially tightened after the bearing has cooled. When the bearing outer ring is tightly fitted with a light metal bearing seat, a hot mounting method of heating the bearing seat can be used to prevent the mating surface from being scratched. When heating the bearing with the fuel tank, there should be a grid at a certain distance from the bottom of the tank, or the bearing should be hung with a hook. The bearing cannot be placed on the bottom of the tank to prevent sinking impurities from entering the bearing or uneven heating. There must be a thermometer in the tank. Strictly control the oil temperature to not exceed 100 ℃ to prevent the tempering effect and reduce the hardness of the ferrule.
tolerance
Standard deep groove ball bearings have ordinary grades, all conforming to GB / T 307.3-1996. [2]
Play
The radial clearance of the bearing is divided into original clearance, installation clearance and working clearance. Generally, the original radial clearance of the bearing is greater than the clearance during bearing operation. 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 movement accuracy. Strictly speaking, the dynamic load rating of a bearing varies with the amount of clearance. The load ratings (C and C0) listed in the product catalog are the load values ​​when the working clearance is zero. If the clearance is too large, it will cause the bearing's internal bearing area to decrease, the rolling contact surface stress will increase, the bearing's motion accuracy will decrease, the vibration and noise will increase, and the bearing's service life will be shortened. It can even cause the bearing to "bite" during operation. Therefore, it is important to choose different levels of bearing clearance according to the type of bearing and the operating conditions.
Standard deep groove ball bearings have C2, standard (CN), C3, C4, and C5 internal clearances, all in accordance with GB4604.

· The radial clearance of deep groove ball bearings is shown in the table below. [2]
Cage
Deep groove ball bearings generally use steel stamped cages or brass solid cages. When the outer diameter is less than 400 mm, a steel stamped cage is used without a post code. When the outer diameter is greater than 400 mm, a brass solid cage is often used without a post code.
Notes edit
For deep groove ball bearings, the bearing load is too small during operation, which will cause sliding between the ball and the raceway, which will cause the abrasion. In particular, large deep groove ball bearings with heavy ball and cage weights have this tendency. In many cases, bearings will rust. There are many reasons for bearing corrosion. The most common factors in our daily life are the following:
1) Moisture, dirt, etc. have invaded due to poor sealing device;
2) The bearing is not used for a long time, it exceeds the rust prevention period, and it lacks maintenance.
3) The surface roughness of the metal is large;
4) Contact with the corrosive chemical medium, the bearing is not cleaned clean, the surface is stained with dirt, or the bearing is touched with sweaty hands. After the bearing is cleaned, it is not packaged or installed in time, and exposed to the air for a long time. Contaminate
5) Ambient temperature and humidity and contact with various environmental media; the rust inhibitor fails or the quality does not meet the requirements.
Appendix editing
1. Code and representation of rolling bearing
According to GB / T 272—1993, the rolling bearing code and its expression are as follows:
The composition of the bearing code: The bearing code is composed of the basic code, the front code and the rear code.
(1) Basic code The basic code indicates the basic type, structure and size of the bearing and 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 dimensions specified in any standard of GB 273.1, GB 273.2, GB 273.3, GB 3882. Its basic code is composed of bearing type code, size series code and inner diameter code.

(2) Front and rear codes The front and rear codes are supplementary codes added around the basic code of the bearing when the structural shape, dimensions, tolerances, and technical requirements change.


Rules for post code designation:
a. The post code is placed to the right of the basic code and half a Chinese character space away from the basic code (except for the symbols "-" and "/" in the code). When there are many change items, there are multiple sets of post-codes, and they are arranged from left to right in the order listed in Table 3-114.
b. Change the content after 4 groups (including 4 groups), then use "/" to separate the previous code from its code name; for example: 6205-2Z / P6 22308 / P63.
c. Change the content to the two groups after the fourth group. When the numbers or characters in the codes of the former group and the latter group may be confused, the space between the two codes is half a Chinese character. Example: 6208 / P63 V1
Deep groove ball suffix meaning
CN: Ordinary group radial clearance; usually only used in combination with the following letters to indicate a narrower or offset clearance range
H: narrowed clearance range, equivalent to the upper half of the original clearance range
L: narrowed clearance range, equivalent to the lower half of the original clearance range
P: offset clearance range, equivalent to the upper half of the original clearance range and the lower half of the next set of clearance ranges
The above letters are also applicable to the corresponding meanings when combined with the following clearance groups: C2, C3, C4, and C5, such as C2
C2: The radial clearance is smaller than the normal group
C3: The radial clearance is larger than the normal group
C4: Radial clearance is greater than C3
C5: Radial clearance is greater than C4
DB: Two single-row deep groove ball bearings paired back-to-back
DF: Two single-row deep groove ball bearings paired face to face
DT: Two single-row deep groove ball bearings paired in series
E: Reinforced design
GJN: Polyurea-based grease, NLGI consistency 2, temperature range -30 to +150 degrees (standard filling amount)
GXN: Polyurea-based grease, NLGI consistency 2, temperature range -40 to +150 degrees (standard filling amount)
J: Stamped steel cage
LHT23: lithium grease, NLGI consistency 2, temperature range -50 to +140 degrees (standard filling amount)
LT: Lithium-based grease, NLGI consistency 2, temperature range -55 to +110 degrees (standard filling amount)
LT10: Lithium grease, NLGI consistency 2, temperature range -50 to +90 degrees (standard filling charge)
M: Machined brass cage, steel ball guide. Different designs and materials are followed by a digital logo, such as M2
MA: Machined brass cage, outer ring guided
MB: Machined brass cage, inner ring guide
MT33: lithium-based grease, NLGI consistency 3, temperature range -30 to +120 degrees (standard filling amount)
MT47: Lithium-based grease, NLGI consistency 2, temperature range -30 to +110 degrees (standard filling amount)
N: Stop ring on outer ring
NR: Stop ring and stop ring on outer ring
N1: groove on the side of outer ring
P5: Dimensional accuracy and rotation accuracy conform to ISO tolerance level 5
P6: Dimensional accuracy and rotation accuracy conform to ISO tolerance level 6
P52: P5 + C2
P62: P6 + C2
P63: P6 + C3
RS1: Nitrile butadiene rubber (NBR) contact seal with steel frame on one side
RSH: Nitrile butadiene rubber (NBR) contact seal with steel frame on one side
RSL: NBR low-friction seal with steel frame on one side
RZ: NBR low friction seal ring with steel frame on one side
TH: Fiber reinforced phenolic resin cage (card type)
TN: injection nylon cage
TN9: injection molded glass fiber reinforced nylon 6,6 cage
VL0241: The outer surface of the outer ring is coated with alumina, and the insulation capacity is up to 1000VDC
VL2071: the outer surface of the inner ring is coated with alumina, and the insulation capacity is up to 1000VDC
WT: Polyurea-based grease, NLGI consistency 2, temperature range -40 to +160 degrees (standard filling amount)
Y: stamped copper cage
Z: stamped steel dust cover on one side
ZNR: Stop ring and stop ring on the outer ring, stamped steel dust cover on the other side of the stop slot
2RS1: Nitrile rubber (NBR) contact seal ring with steel frame on both sides
2RSH: Nitrile rubber (NBR) contact seal ring with steel frame on both sides
2RSL: Nitrile rubber (NBR) low friction seal ring with steel frame on both sides
2RZ: Nitrile rubber (NBR) low friction seal ring with steel frame on both sides
2Z: stamped steel dust cover on both sides
2ZNR: Stop ring and stop ring on outer ring, stamped steel dust cover on both sides
Common suffixes with ball gaps:
C3: The radial clearance is larger than the normal group
N: Stop ring on outer ring
NR: Stop ring on the outer ring with stop ring
Z: stamped steel dust cover on one side
ZNR: Stop ring and stop ring on the outer ring, stamped steel dust cover on the other side of the stop slot
2Z: stamped steel dust cover on both sides
2ZNR: Stop ring and stop ring on outer ring, stamped steel dust cover on both sides
Meaning of stainless steel suffix:
R: outer ring with flange
VT378: Non-toxic grease (accidental contact with food ingredients)
2RS1: Nitrile rubber (NBR) contact seal with steel frame on both sides
2Z: stamped steel dust cover on both sides
2ZR: stamped steel dust cover on both sides and flange on outer ring