Get on your knees and beg for help! Bearing problem, thank you!

These letters are difficult for newcomers who are new to bearings to understand, but I suggest you can buy some books that accept bearings professionally to enrich yourself! It's very organized, and you won't waste time learning a lot!

Let me introduce you to it!

NU generally belongs to the pre-designation, which is a type of cylindrical roller bearing, which belongs to cylindrical roller bearings with no flange in the inner ring, such as NU203, etc.

I haven't seen this before, but I feel that it is inside the cylindrical rollers, which may have something to do with the cage, and it should mean strengthening the cage!

Generally belongs to the post-code, which can represent the meaning of copper protection, that is, the cage material of the bearing is copper, such as: or this m is the cage of the bearing for the copper cage, but there are exceptions, the representation method of each manufacturer is very different, according to the naming method of each brand manufacturer of the bearing, to know what it means!

H should belong to the prefix code, which is generally expressed as stainless steel, and the Japanese stainless steel ss means the same, such as H 608 zz!

2z is also equal to zz, this is generally said to be deep groove ball and angular contact type bearings, is to indicate that the secret recipe of the bearing is used: dust cap sealing, in addition you may encounter rs or 2rs and so on is the meaning of rubber seals, z and rs is the meaning of large surface sealing, 2z and 2rs is the meaning of double-sided sealing!

n is generally the post-code, which is used more on deep groove balls, indicating that there is a groove on one side of the outer ring of the bearing.

Like NU, it is a type of cylindrical roller bearing, but NJ is a cylindrical roller bearing that represents a single flange of the inner ring, and NU does not have an inner retaining ring!

ECM is the post-code, which is only available for motor bearings, and this type of bearing** is also higher than the ordinary one, such as 6204ECM.

I haven't seen this yet, to judge what it means according to different types of bearings, I hope you can post it to my blog, I'll take a look!

2rs is also the post-code, is a sealing representation method of bearing, is a two-sided rubber seal, can refer to 2z said!

This should be divided into two places, first: cc is the meaning of iron protection, generally for the spherical roller bearing, the cage is iron protection, and there is a kind of cage, which is copper protection, which is represented by ca, and the second:

The W33 is also for spherical rollers, which means that the outer ring of this model has a lube groove and three evenly distributed oil filling holes.

This k is the meaning of taper, all bearing models with k after are on behalf of the taper, if there is only a k, then this taper is k=1:12, if you see a model with k30 after it, then this k30 is equal to 1:

30 taper!

In addition, I also have some bearing books that I want to deal with, if you need I can give you a low price**, I also read these at the beginning!!

un, cylindrical roller bearings without flanges.

ECJ, angular contact ball bearing.

m, reinforced bearing.

H, 2Z, double-sided metal dust cover.

n nj, cylindrical roller bearings with retaining rings on one side.

ecm 2e

2RS, with rubber dust caps on both sides of the bearing.

cc/w33，

Handbook of Mechanical Design, Volume II.

Please confirm the standard model of the bearing first, and then confirm the fit tolerance of the bearing, I hope it will help you! ~~

Bearings with an inner diameter of 25 and an outer diameter of 52 should be 6205, nu205, 30205 and so on.

Tell me which bearing it is and send me the email address and I'll send you a tolerance fit sheet.

Bearings are fixed parts in machinery. When other parts are moving relative to each other on the shaft, the parts used to maintain the center position of the shaft and control the motion are called bearings. The part that supports a shaft that rotates relative to each other is called a bearing.

Normally, it is the axis that rotates. There are also shafts that do not rotate but the housing rotates, such as automobile wheel bearings. Bearings are divided into rolling bearings and plain bearings.

Bearing is a component that fixes and reduces the load friction coefficient in the process of mechanical transmission. It can also be said that when other parts move relative to each other on the shaft, it is used to reduce the friction coefficient in the process of power transmission and keep the center position of the shaft fixed. Bearings are one of the most important components in contemporary machinery and equipment.

Its main function is to support the mechanical rotating body to reduce the friction coefficient of the mechanical load of the equipment during the transmission process.

There are also people who do not use washers, directly mandrel and normal inner ring welding, if for the sake of reputation, or do not use the method of lack of morality, the bearing is not electric welding!

The position of the inner hole of the steel tube bearing, drilling and tapping, fixing the mandrel, and the bearing is sleeved on the mandrel, and it is fixed on the line.

Just make a thru-shaft, just like the one below. The inner diameter of the journal and the bearing is equal, the length is 20 + 9 2, and a through hole is drilled at the bottom of the square steel, and the center height is equal to the bearing radius - 2mmAssemble it on your bottom picture.

It is enough to weld two iron rods under the steel pipe to make the shaft.

Here's how it goes. But there are a few things that are not right. 1) Not a tight bolt but a compression end, a relaxed end; 2) FAFR should be compared to E and not to 1. I don't know if the calculation was wrong.

How can each question help you analyze?

You don't provide specific dimensions and parameters, so I can't help you make a specific selection.

Considering the angular and axial deviation of the bearing seat on both sides, the outer spherical ball bearing, spherical roller bearing, and self-aligning ball bearing are selected, and the assembly and maintenance are convenient, compact, reliable and economical.

This shouldn't help you choose! But in general, tapered bearings, back-to-back installation will be better!

Bearing production process.

The specific production process of the bearing: raw materials - inner and outer ring processing, steel ball or roller processing, cage (stamping or solid) processing - bearing assembly - finished bearing products.

In the bearing production process, the most critical are the following links:

1. Forging link.

The forging link is an important link to ensure the reliability and life of the bearing, and the raw materials are forged to form the bearing ring blank. At the same time, the structure of the raw material becomes denser and the flow line is better, which can improve the reliability and service life of the bearing. In addition, the quality of the forging process will also directly affect the utilization rate of raw materials, which will have an impact on production costs.

2. Heat treatment.

The heat treatment link is to carry out high temperature treatment of the bearing ring after forging and turning, which directly affects the uniformity of carburizing in the bearing ring, can improve the wear resistance and hardness of the bearing, and is also an important link that affects the reliability and life of the bearing.

3. Grinding and processing links.

After heat treatment, the bearing ring also needs to be grinded, which is an important part of ensuring the accuracy of the bearing. After grinding, the production process of bearing rings is basically completed.

Attached] Bearing inner and outer ring process: bar - forging - turning - heat treatment - grinding - super finishing - final inspection of parts - anti-rust storage.

The main production equipment includes: cold rolling machine, automatic ball bearing internal cylindrical grinder, quenching line, annealing furnace, press, CNC lathe, bearing grinder, inner groove grinder, outer groove grinder, high-precision horizontal axis rotary surface grinder, CNC milling machine, centerless grinder, high-precision through-grinding centerless grinder, precision channel superfinishing machine, inner surface CNC grinder, CNC reciprocating double-end grinder, high-temperature and high-speed bearing testing machine, heat treatment production line and quality inspection equipment.

It depends on whether you are a manufacturer or a patchwork, you engage in a few ** manufacturers, do the outer ring of the outer ring, the inner ring of the inner ring, the steel ball of the steel ball, the retainer of the retainer, and then you go to put it together, no. If you invest a lot, you can do it yourself.