For people who have little contact with machinery, they usually only see the rotation of large machinery. It should be a totally unfamiliar concept for bearings. However, the bearings play a vital role in mechanical movement. So, do you know what a needle roller bearing is ? The needle bearing is a roller bearing with a cylindrical roller, which is both thin and long with respect to its diameter. This kind of roller is called a needle roller. Now I will introduce the needle roller bearing model in the bearing and hope to help those who have this requirement!

Needle roller bearing

The needle bearing is a roller bearing with a cylindrical roller, which is both thin and long with respect to its diameter. This kind of roller is called a needle roller. In spite of the smaller cross-section, the bearing still has a high load bearing capacity, the needle roller bearing is equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, L is the length of the roller), therefore The radial structure is compact, and the inner diameter size and load capacity are the same as those of other types of bearings, and the outer diameter is the smallest, which is particularly suitable for a support structure in which the radial installation size is limited.

According to different occasions, the inner ring bearing or needle roller and cage assembly can be used. The journal bearing surface and the housing hole surface matched with the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance. As with a bearing with a ring, the hardness of the raceway surface of the shaft or housing bore, the machining accuracy and the surface quality should be similar to the raceways of the bearing ring. This type of bearing can only withstand radial loads.

  

Needle roller bearing features

Needle roller bearings are equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, L is the length of the roller), so the radial structure is compact, and its inner diameter size and load capacity are the same as those of other types of bearings. With the smallest outside diameter, it is especially suitable for radial mounting dimensions with limited bearing results. According to different occasions, the inner ring bearing or needle roller and cage assembly can be used. The journal bearing surface and the housing hole surface matched with the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance. As with a bearing with a ring, the hardness of the raceway surface of the shaft or housing bore, the machining accuracy and the surface quality should be similar to the raceways of the bearing ring. This type of bearing can only withstand radial loads.

  

Needle bearing model comparison

The needle roller bearing is a roller bearing with a cylindrical roller. The roller has a slender shape, a small cross-section, and a high bearing load bearing capacity. Therefore, it is suitable for a support effect in which the radial installation size is limited. Needle roller bearings are equipped with thin, long rollers (3 to 10 times the diameter of the roller and generally no larger than 5 mm in diameter) and have a compact radial configuration.

A complete bearing designation consists of a basic designator plus one or more supplementary codes. All of SKF's standard bearings have a specific basic model, usually three, four or five digits, or a combination of letters and numbers. The first number or first letter or combination of letters indicates the bearing type, followed by two digits Determine the ISO size series.

As the type of needle roller bearing is relatively complex, here is a brief introduction to the specific classification and model comparison of several needle roller bearings.

1. Radial needle roller and cage assembly (K type)

2. Needle roller bearings with double locking rings in the outer ring (NA type, NKI type, RNA type, NK type)

3. Single row needle roller bearings with double ribs in the outer ring (NA type, NKI type, RNA type, NK type)

4. Double row needle roller bearings with double ribs on the outer ring (NA type, RNA type)

5, Drawn cup needle roller bearings (HK type, BK type)

This type of bearing has a low cost and a large bearing capacity, and is suitable for installing a support structure having a limited size.

Editor's summary: The above is the needle roller bearing type inquiry, the needle roller bearing type comparison table related introduction, hoped to be able to help to have this kind of demand friend! For more information, please continue to follow our website. Follow-up will present more exciting content!

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