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Attachment: Under normal circumstances, the shaft is generally marked with 0~+0.005. If it is not often disassembled, it is +0.005~+0.01 interference fit. If you want to disassemble frequently, it is a transition fit. We also need to take into account the thermal expansion of the shaft material itself during rotation, so the larger the bearing is, the better the clearance fit is -0.005~0, and the maximum clearance fit should not exceed 0.01. Another one is the interference of the moving coil and the clearance of the static ring.

(3) The use of needle roller bearings without an inner ring or without an outer ring, only with cage needle roller assembly, the requirements of the matching journal or bearing housing hole machining accuracy, surface hardness should be the same as the bearing collar raceway.

Types of bearingwith images PDF

(2) Various types of bearings can also be preloaded to increase the rigidity of the support. Such as angular contact ball and tapered roller bearings, in order to prevent shaft vibration, increase the rigidity of the support, often in the installation of pre-applied certain axial force, so that the mutual compression.

(1) The rollers and raceway are in linear contact, so the capacity of the radial load is large and can withstand heavy loads and shock loads.

what are the 4types ofbearings?

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Radial bearings are categorized into radial ball bearings and radial roller bearings. Thrust bearings are categorized into thrust ball bearings and thrust roller bearings.

(1) The thrust ball are separable bearings, with a contact angle of 90°, which can be mounted separately and can only withstand axial load.

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Types ofbearings pdf

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(1) In the radial space is limited by the occasion can choose needle roller bearings or needle roller and cage assembly.

②Because the tolerance value of the bearing outer diameter is different from the general reference shaft, it is also a special tolerance zone. In most cases, the outer ring is fixed in the housing hole, and some bearing components need to be adjusted according to the structural requirements, and their coordination is not suitable. Too tight, often cooperate with H6, H7, J6, J7, Js6, Js7, etc.

(4) With spherical seat ring thrust ball bearings with spherical alignment performance, can eliminate the impact of installation errors.

(1) Generally speaking, in higher speed working conditions, it is appropriate to use deep groove ball bearings, angular contact bearings, cylindrical roller bearings.

(3) A bearing while bearing radial load and axial load (synthetic load), if the synthetic load is small, choose deep groove ball bearings or angular contact ball bearings; if the load is larger, choose tapered roller bearings.

1. According to the presence or absence of rolling bodies, bearings can be divided into rolling bearings and plain bearings.

For the housing bore tolerance zone for radial and angular contact bearings, refer to the corresponding tolerance zone table. When selecting, pay attention to avoid clearance fits for outer rings that oscillate or rotate in the direction of load. The size of the equivalent radial load also affects the fit selection of the outer ring.

(1) Inner ring and outer ring of bearing have tapered raceway, the shape of the rollers is round table-shaped. The roller is in line contact with the raceway and can withstand the heavy combined radial and axial loads as well as axial loads. The axial bearing capacity increases with the increase of contact Angle.

Types of bearingin mechanical Engineering

Bearing is the part that supports the shaft, used to guide the rotational movement of the shaft and bear the load transferred from the shaft to the frame. Bearing is a widely used and strictly required component and basic part of the machinery industry. It is the supporting element of the rotating shaft or movable part of various machines, and it is also the supporting element that relies on the rolling body to achieve the rotation of the host. It is also called the joint of machinery.

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Rolling bearings can be divided into ball bearings, cylindrical roller bearings, and tapered roller bearings according to the shape of the rolling body.

(1) Rolling bearing elastic deformation is very small, in most machinery can not be considered, but in some machinery, such as machine tool spindle, bearing rigidity is an important factor, generally should be selected cylindrical and tapered roller bearings. Because these two types of bearings are under load, the rolling body and raceway are point contact, rigidity is poor.

① When the bearing inner diameter tolerance zone and the shaft tolerance zone form a fit, the tolerance code originally belonging to the transition fit in the general base hole system will become the over-win fit, such as k5, k6, m5, m6, n6, etc., but the over-win amount is not Large; when the bearing inner diameter tolerance is matched with h5, h6, g5, g6, etc., it is not a clearance but an over-win fit.

(3) It can be widely used in the fields of machining, turbomachinery, aerospace, vacuum technology, rotor dynamics identification, and testing, etc. It is recognized as a promising new type of shaft.

(1) Small radial size of needle roller bearings, the radial bearing capacity is very high, can not bear axial load, only as a free end support use.

The matching accuracy level is generally selected at level 6. Sometimes it depends on the material and processing technology. In theory, level 7 is a bit low, and if it is matched with level 5, grinding is required.

Bearings are the basic parts of machinery and are widely used in the machinery industry, and they are also the support parts of various machines. There are various types of bearings, and each type of bearing has its own characteristics.

8types of bearing

(3) The requirements of high rotational accuracy of the bearing (such as machine tool spindle) and the application of high-speed conditions, should be selected higher precision than the ordinary level of bearing.

The equivalent radial load P is divided into "light", "normal" and "heavy" loads. The relationship between it and the rated dynamic load C of the bearing is: light load P≤0.06C normal load 0.06C

(2) Require high rotational accuracy, more use of deep groove ball, angular contact ball, and cylindrical roller bearings, etc.

Bearing typesand names

Bearing fits are generally transition fits, but interference fits are optional in special cases, but rarely. Because the cooperation between the bearing and the shaft is the cooperation between the inner ring of the bearing and the shaft, the base hole system is used. Originally, the bearing should be completely zero. We can also think so in actual use, but in order to prevent the inner ring of the bearing and the shaft When the minimum limit size is matched, the inner ring rolls and damages the surface of the shaft. Therefore, our bearing inner ring has a lower deviation tolerance of 0 to several μ to ensure that the inner ring does not rotate. Therefore, the bearing generally chooses transition fit, even if Even if the transition fit is selected, the interference should not exceed 3 wires.

(2) Tapered roller design should make the roller and the raceway of the inner ring and outer ring contact line extended after the intersection of the same point on the axis of the bearing used to achieve rolling.

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(2) With the advantages of low mechanical wear, low energy consumption, low noise, long life, no lubrication, no oil pollution, etc., especially for high-speed, vacuum, ultra-clean, and other special environments.

(2) In liquid lubrication conditions, the plain surface is separated by lubricating oil without direct contact, but also can greatly reduce friction loss and surface wear, the oil film also has a certain ability to absorb vibration, but the starting friction resistance is large.

(4) The new design of tapered roller bearing uses strengthened structure, the longer diameter of rollers, the longer length of rollers, more rollers, and the rollers with convex shape are used, the capacity and service life are obviously improved. The contact of the big end face and the big retaining edge of the rollers is spherical and conical, which improves lubrication.

(3) Tapered roller bearings can be categorized into single row, double row, and four-row, and other different types according to the number of rollers installed. This type of bearing also uses more imperial series products.

(4) The processing needs of the shaft or base hole are high, to strictly control the relative deviation of the outer ring axis that may be caused by bearing installation, avoid the concentration of contact stress;

(2) Low limit speed. Steel ball plus centrifugal force squeezed to the outside of the raceway, easy to abrasion, but not suitable for high-speed operation.

(1) Machine tool spindle, precision machinery, and instrumentation, etc. require high accuracy of rotating body runout, should be used precision level 5, 4, 2 and other high precision bearings of deep groove ball, angular contact ball, tapered roller, cylindrical roller, and thrust angular contact ball bearings.

Fit tolerance is the sum of the hole and shaft tolerances that make up the fit. It is the amount of variation that allows clearance to interference.

(3) Mainly used to bear radial load, but in the bearing radial clearance increases, with the nature of angular contact ball bearings, can withstand two directions of alternating axial load;.

For the tolerance zone of the shaft on which radial and angular contact bearings are mounted, refer to the corresponding tolerance zone table. For most occasions, when the shaft rotates and the radial load direction does not change, that is, when the bearing inner ring rotates relative to the load direction, a transition or interference fit should generally be selected. When the shaft is stationary and the radial load direction is unchanged, that is, when the inner ring of the bearing is static relative to the load direction, transition or small clearance fit can be selected (too much clearance is not allowed).

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3 maintypes ofbearings

(3) N-type and NU type cylindrical roller bearing can do axial movement, can adapt to the thermal expansion or installation error caused by the shaft and the housing relative position changes, can be used to support the free end.

Types of bearingwith diagram

(4) For the same type of bearings, the smaller the size, the higher the allowable speed. In the selection of bearings, one should pay attention to making the actual speed is lower than the limit speed.

The size of the tolerance zone and the position of the tolerance zone for the hole and shaft make up the fit tolerance. The size of the hole and shaft fit tolerance indicates the fit accuracy of the hole and the shaft. The size and position of the hole and shaft fit tolerance zone indicate the fit accuracy and fit nature of the hole and shaft.

In short, to choose a suitable bearing, a variety of factors should be considered. By comparing different types of bearings and their characteristics, we hope that your questions can be answered. WayKen is committed to providing you with a one-stop-shop and bearings and fastener solutions that fit your project.

Unless there is a special need, the bearing seat of the rolling bearing generally adopts an integral structure. The split bearing seat is only used when there is difficulty in assembly, or when the advantage of convenient assembly becomes the main consideration, but it cannot be used for tight fit. Or a more precise fit, such as K7 and a tighter fit than K7, or a seat hole with a tolerance class of IT6 or more, shall not use a split housing.

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(1) When mainly bearing radial load (direction perpendicular to the shaft), choose the radial bearing, when mainly bearing axial load (the same direction as the shaft), choose axial bearing. Axial load is also called thrust load.

The tolerance class of the shaft or housing bore that fits the bearing is related to the bearing accuracy. For the shaft matched with the P0 grade precision bearing, the tolerance level is generally IT6, and the bearing seat hole is generally IT7. For occasions with higher requirements on rotation accuracy and running stability (such as motors, etc.), the shaft should be IT5 and the bearing seat hole should be IT6.

(1) Compared with the traditional ball, plain, and oil film bearings, magnetic bearings do not have mechanical contact and the rotor can achieve high operating speeds.

(2) Small friction coefficient, can be used for very high speed working occasions, its limit speed next to deep groove ball bearings.