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Basic parameters
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 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. The open type means that the bearing does not have a sealed structure. The sealed deep groove ball is divided into dust-proof seal and oil-proof. seal. The material of the dust-proof sealing cover is stamped steel plate, which only serves to prevent 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.
Single row deep groove ball bearing type code is 6, double row deep groove ball bearing code is 4. It has a simple structure and is easy to use, and is the most commonly produced and widely used type of 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 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 bear a large axial load. The friction coefficient of the deep groove ball bearing is very small, and the limit speed is also high.
Bearing characteristics
Deep groove ball bearings are the most commonly used rolling bearings. It has a simple structure and is easy to use. It is mainly used to bear radial load, but when the radial clearance of the bearing is increased, it has a certain performance of angular contact ball bearing and can bear combined radial and axial loads. It can also be used to bear pure axial load when the rotational speed is high and the thrust ball bearing is not suitable. Compared with other types of bearings with the same size and size as deep groove ball bearings, this type of bearing has a small friction coefficient and a high limit speed. However, it is not resistant to impact and is not suitable for bearing heavy loads.
After the deep groove ball bearing is mounted on the shaft, within the axial clearance range of the bearing, the axial displacement of the shaft or the housing can be limited in two directions, 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 structure
Compared with other types, the deep groove ball bearing has a simple structure and is easy to achieve higher manufacturing accuracy, so it is convenient for mass production in series, and the manufacturing cost is also low, and it is extremely common. In addition to the basic type, deep groove ball bearings also 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 bearings with large load capacity of ball notches, double row deep groove ball bearings.
Bearing Type
Deep groove ball bearings are mainly used to bear radial loads, but are also commonly used to bear combined radial and axial loads. Especially when the rotating speed of mechanical equipment is very high, and it is not suitable to use thrust bearing, the bearing can be used to bear bidirectional pure axial load, and no maintenance is required during operation. It is a kind of bearing with low price and wide application. Deep groove ball bearing models are: deep groove ball bearing (type 60000); deep groove ball bearing with retaining groove in the outer ring (type 60000N); deep groove ball with a dust cover on one side and a retaining groove in the outer ring on the other side Bearing (type 60000-ZN); deep groove ball bearing with dust cover on both sides and retaining groove in outer ring (type 60000-2ZN); deep groove ball bearing with dust cover on one side (type 60000Z); two sides Deep groove ball bearing with dust cover (type 60000-2Z); deep groove ball bearing with sealing ring on one side (type 60000-LS, 60000-RZ); 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 type).
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 less than 26mm;
(2) Small bearings - bearings with a nominal outer diameter range of 28-55mm;
(3) Small and medium-sized bearings鈥攂earings 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) Large bearings - bearings with a nominal outer diameter range of 200-430mm;
(6) Extra-large bearing鈥攂earings with a nominal outer diameter range of 440mm or more.
Processing form
The processing forms of deep groove ball bearing parts are as follows:
1. Multi-process processing: Generally, the production of bearings requires 20 to 40 processes, and there are more than 70 processes.
2. Forming processing: The working surfaces of bearing parts are all rotary forming surfaces, which are suitable for processing by forming method.
3. Precision machining: Most of the surface of the bearing parts must be ground, and the size and geometric accuracy of the grinding are in 渭m.
Application
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 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 are tightly fitted, and the outer ring and the bearing seat hole are loosely fitted, the bearing can be press-fitted on the shaft first, and then the shaft together with the bearing. Put them into the hole of the bearing seat together. When press-fitting, on the end face of the inner ring of the bearing, pad an assembly sleeve (copper or mild steel) made of soft metal material. The outer ring of the bearing is tightly fitted with the hole of the bearing seat, and the inner ring and the shaft are When the fit is loose, 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 the seat hole, install the inner ring and the seat hole. The outer ring should be pressed into the shaft and the seat hole at the same time, and the structure of the assembly sleeve should be able to press 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 tight fit is transformed into a loose fit by thermal expansion. It is a common and labor-saving installation method. This method is suitable for large interference. For the installation of the bearing, put the bearing or separable bearing ring into the oil tank and heat it evenly at 80-100 鈩?before hot-loading, and 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 after cooling If the fit is not tight, the bearing can be axially tightened again after cooling. When the outer ring of the bearing is tightly fitted with the light metal bearing seat, the hot-fitting method of heating the bearing seat can be used to avoid the mating surface from being scratched. When heating the bearing with the oil tank, there should be a mesh grid at a certain distance from the bottom of the box, or hang the bearing with a hook. The bearing should not be placed on the bottom of the box to prevent heavy impurities from entering the bearing or uneven heating. There must be a thermometer in the oil tank. Strictly control the oil temperature not to exceed 100 鈩?to prevent the tempering effect and reduce the hardness of the ferrule.
Tolerance
Standard deep groove ball bearings have ordinary grades, all in line with GB/T 307.3-1996.
Clearance
The radial clearance of the bearing is divided into original clearance, installation clearance and working clearance. Usually, the original radial clearance of the bearing is larger than the clearance of the bearing during 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 motion accuracy. Strictly speaking, the dynamic load rating of the bearing varies with the size of the clearance. The load ratings (C and C0) listed in the catalog are the load values with zero operating clearance. If the clearance is too large, the internal bearing area of the bearing will be reduced, the stress of the rolling contact surface will increase, the motion 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 generation. It will even cause the bearing to "seize" during operation. Therefore, it is very important to select different grades of bearing clearance according to the type of bearing and working conditions.
Standard deep groove ball bearings have C2, standard (CN), C3, C4 and C5 internal clearances, all of which are in line with GB4604. 路The radial clearance of deep groove ball bearings is shown in the table below.Customized Other Roller Bearing
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