Several common classification methods for rolling bearings

 1. Classified by rolling bearing (import bearing) construction type

(1) Imported bearings are classified according to their load direction or nominal contact angle:
1) Radial bearings - important for rolling bearings bearing radial loads, with nominal contact angles from 0 to 45. According to the nominal contact angle, it is divided into: radial contact bearing----the radial bearing with the nominal contact angle of 0: the radial angular contact bearing---the radial bearing with the nominal contact angle greater than 0 to 45.
2) Thrust bearings—Important rolling bearings for axial loads with nominal contact angles greater than 45 to 90. According to the different nominal contact angles, they are further divided into: Axial contact bearings----Thrust bearings with a nominal contact angle of 90: Thrust angular contact bearings----Thrust bearings with a nominal contact angle greater than 45 but less than 90.

(2) Bearings are classified according to the type of rolling elements:
1) Ball bearing ---- rolling element is the ball:
2) Roller bearing----The rolling element is a roller. Roller bearings are divided into: Roller bearings----rolling elements are cylindrical roller bearings. The ratio of length to diameter of cylindrical rollers is less than or equal to 3; needle roller bearings---- The rolling element is a needle roller bearing. The ratio of the length to the diameter of the needle is greater than 3, but the diameter is less than or equal to 5 mm; the tapered roller bearing----the rolling element is the bearing of the tapered roller; the spherical roller bearing is rolling one by one. The body is a spherical roller bearing.

(3) Whether the imported bearings are tempered according to their tasks are divided into:
1) Self-aligning bearing----the raceway is a spherical shape, which can adapt to the angular deviation and angular movement between the two raceway axes;
2) Non-aligning bearings (rigid bearings)----bearings that can offset the axial angle between the raceways.

(4) The imported bearings are divided into: according to the number of rows of rolling elements:
1) Single row bearings----bearings with a row of rolling elements;
2) Double row bearings----bearings with two rows of rolling elements;
3) Multi-row bearings----bearings with more than two rows of rolling elements, such as three-row and four-row bearings.

(5) Imported bearings are classified according to whether their components are separate:
1) Separate bearings----bearings with separate parts;
2) It is not possible to separate the bearings----the bearings can not be freely separated after the final assembly.

(6) The imported bearings can be divided into various construction types according to their structural shape (if there is no filling groove, whether there are inner and outer rings and the shape of the ferrule, the structure of the ribs, or even the presence or absence of a cage).

    2. Classification according to the size of rolling bearings Bearings are divided into: according to their outer diameter size:

(1) Miniature bearings----bearings with a nominal outer diameter size of 26 mm or less;
(2) Small bearings----bearings with nominal outer diameter dimensions of 28-55mm;
(3) Small and medium-sized bearings----bearings with a nominal outer diameter of 60-115mm;
(4) Medium and large-sized bearings----bearings with a nominal outer diameter of 120-190mm
(5) Large bearings----bearings with a nominal outer diameter of 200-430mm;
(6) Extra large bearings----bearings with a nominal outer diameter size of 440mm or more.

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What is the range of FAG cross roller bearings?

FAG bearing cross-roller bearings can withstand loads from all directions (such as axial, thrust or momentum loads). Since the FAG is in contact with the outer surface of the track, the bearing is subject to load and elastic deformation is small.
This type of FAG imported bearings are commonly used in industrial robots, mission machinery and medical facilities. FAG requires high rigidity, tightness and high speed to ensure accurate position in cross roller bearings, because cylindrical rollers are in The 90-degree V-groove rolling surface FAG bearings are arranged perpendicular to each other by the distance maintaining device, so that one cross-roller bearing can bear loads in all directions such as radial load, axial load and moment load.
The size of the inner and outer rings is minimized, and the special ultra-thin type is a small size close to the limit and has high rigidity, so it is most suitable for the joint portion or the rotating portion of the industrial robot.

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Detailed explanation: lubrication method of bearing

The lubrication of bearings is mainly divided into grease lubrication and oil lubrication.

Grease lubrication

Grease lubrication can be used after filling the grease for a long time without replenishing, and the structure of the sealing device is relatively simple, so it is widely used.
Grease lubrication has a sealing method in which the sealed bearing is filled with grease in advance, and a filling and fat filling method in which the inside of the outer casing is filled with an appropriate amount of grease and replenished or replaced at intervals.

In addition, for machines that require multiple bearings to be lubricated, a centralized grease supply method that connects the pipes to each lubrication location is also used.

1) Filling amount of grease
The amount of grease filling in the outer casing varies with the structure and volume of the outer casing, and is generally filled to 1/3-1/2 of the volume.
When the filling amount is too much, the grease will deteriorate due to stirring and heating, aging and softening, and care should be taken.
However, when used for low-speed bearings, it is sometimes filled to 2/3-1 of the volume to prevent foreign matter from entering.
2) Replenishment and replacement of grease
Grease replenishment and replacement are closely related to the lubrication method. No matter which method is used, clean grease must be used, and care should be taken to prevent the intrusion of external foreign matter.
The added grease should be the same brand of grease.
When replenishing grease, it is especially important to ensure that the new grease does enter the inside of the bearing.

Oil lubrication
Oil lubrication is suitable for high-speed bearings and can withstand a certain degree of high temperature, but also effective for reducing vibration and reducing noise, and is mostly used in applications where grease lubrication is not suitable.

Oil lubrication is roughly divided into:
(1) Oil bath lubrication (2) Oil drop lubrication (3) Splash lubrication
(4) Circulating lubrication (5) Jet lubrication (6) Oil mist lubrication
(7) Oil and gas lubrication

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Sealing new structure extends IKO bearing life

     Flow IKO bearings are essential for use in harsh environments, and IKO bearing seals and seals are essential because they prevent dirt ingress and extend IKO bearing life. The rolls in the mill are typically supported by four rows of sealed tapered roller IKO bearings. It is required to withstand strong impact loads, intrusion of water and debris.

    The negative pressure generated in the IKO bearing can cause water to intrude from the main seal, and the structure of the hole seal has a large influence on the negative pressure. Therefore, lower IKO

The negative pressure in the bearing is a basic requirement to prevent water from entering. The most effective method is to make the hole seal not directly in contact with water, while retaining the original function of the hole seal - preventing water and dirt from invading from the side of the roll neck. The sealing method uses surface contact instead of line contact. Whether it is running or stationary, the surface contact hole seal has good sealing performance. Therefore, the new ultra-capacity sealed cleaning roller neck IKO bearing has higher reliability than the conventional sealing roller neck IKO bearing.

    In addition, IKO Bearings Italy Seals has recently developed a new generation of oil and grease seals MudBlock. Its optimized design of the sealing structure can effectively prevent the intrusion of dirt. The conventional sealing structure has a radial sealing lip, a clamping spring between the outer diameter and the race, and a fixed sealing ring. The new structure has a push baffle between the bushing and the seal ring. The outer surface of the seal ring and the inner diameter of the bushing are rubber, and the inner lip is pre-lubricated with waterproof grease. MudBlock can be made from a variety of elastic materials depending on operating conditions and application requirements. These materials include: nitrile, polyacrylate, fluorinated synthetic rubber, and the like.

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