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  • Needle Roller Bearings

    Needle roller bearings are roller bearings with cylindrical rollers that are thin and long relative to their diameter. This type of roller is called a needle roller. Despite the small cross-section, the bearing still has a high load bearing capacity, and the needle bearing is equipped with a thin and long roller (roller diameter D≤5mm, L/D≥2.5, L is the roller length), so The radial structure is compact, its inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, and it is especially suitable for support structures with limited radial mounting dimensions. Depending on the application, bearings or needle roller and cage assemblies without inner ring can be used. The journal surface and the housing hole surface that match the bearing directly serve as the inner and outer rolling surfaces of the bearing to ensure load capacity and running performance. As with ferrule bearings, the hardness of the raceway surface of the shaft or housing bore, the machining accuracy and surface quality should be similar to the raceway of the bearing ring. This type of bearing can only withstand radial loads.

    In addition to the catalogue, it can be used for general engineering bearings, such as: open stamped outer ring

    Needle roller bearings (1), closed drawn cup needle roller bearings (2), needle roller bearings with inner ring (3) and needle roller bearings without inner ring / cage without inner ring (4), The cage and the cage are filled with needle bearings (5) SKF can also supply various types of needle bearings, 1, needle cage assembly 2, no-side needle roller bearings 3, self-aligning 4, combined rolling Needle/ball bearing 5, combined needle roller/thrust ball bearing 6, combined needle roller/cylindrical roller thrust bearing.

    Drawn outer ring
    The drawn cup needle roller bearings are needle bearings with a thin stamped outer ring. Its main feature is that the section height is very low and the load capacity is high. Mainly used for bearing arrangements that are compact, inexpensive, and the bore of the bearing housing cannot be used as the raceway for the needle roller cage assembly. The bearing and bearing housing must be installed in an interference fit. If the axial positioning function such as the box shoulder and the stop ring can be omitted, the inner hole of the bearing housing can be made extremely simple and economical. The drawn cup needle roller bearings mounted on the shaft end are open on both sides and closed on one side. The base end face of the closed stamped outer ring can withstand small axial guiding forces. Drawn cup needle roller bearings generally do not have an inner ring. Where the journal is not hardened and ground, the inner ring listed in the table can be used. The hardened steel outer ring of the drawn cup needle roller bearing is inseparable from the needle roller cage assembly. The free space to store the lubricant can extend the relubrication interval. Bearings are generally designed in a single row. Except for the wider series of bearings 1522, 1622, 2030, 2538 and 3038, they are equipped with two needle retainer assemblies. The outer ring of the bearing has a lubrication hole. All single row drawn cup needle roller bearings with a shaft diameter greater than or equal to 7 mm can be equipped with an outer ring with a lubrication hole (code suffix AS1), depending on the user's needs. Oil-filled drawn cup needle roller bearings can be supplied with oil-sealed drawn cup needle bearings (3 to 5) with open or closed ends where oil seals cannot be installed due to space constraints. These bearings are equipped with a polyurethane or synthetic rubber friction seal that is filled with a lithium-based grease with good rust resistance and is suitable for operating temperatures from -20 to +100 °C. The inner ring of the oil-sealed bearing is 1mm wider than the outer ring. This makes the bearing work well in the case of a slight displacement of the bearing shaft relative to the bearing housing and avoids contamination of the bearing. The inner ring of the bearing also has lubrication holes, which can be relubricated by the outer ring or the inner ring according to the needs of the bearing arrangement.

    Physical ferrule
    Solid ferrule needle bearings consist of one or two ferrules and a needle set with a cage. Depending on the application, it can be divided into bearings with or without inner ring. Therefore, the physical ferrule needle roller bearing can meet the requirements of light weight, small space occupation and large transmission power. Solid ferrule needle bearings have a small volume and high load carrying capacity. Structure type outer ring double rib (or double lock ring) with cage needle roller bearings NA, NAV, NKI type can be installed inner ring and outer ring (with lock ring, full set of needle roller and cage), high speed, It is divided into single column and double column. If the shaft cannot be used as a raceway, that is, if it is impossible or uneconomical to harden the shaft, such a needle bearing with an inner ring can be used.

    Features NA, NKI bearings are RNA and NK needle bearings without inner ring. This type of bearing has no inner ring and is suitable for a support structure with a limited radial mounting size. The journal that matches the bearing directly acts as a rolling surface. As the axis of the raceway surface, the hardware must be hardened and ground, and the entire needle roller bearing can only have a high life and running accuracy when it is machined to the appropriate size and shape accuracy. At the same time, since there is no inner ring, the diameter of the shaft can be appropriately increased, thereby also increasing the rigidity.

    Company:Hangzhou BFW Bearing Manufacturing Co., Ltd.
    Company Address: No.501 Shiting Road, Dongxi Road,Hangzhou, Zhejiang, China
    Tel: +86-0578-2699292
    Fax: +86-0578-2699292
    Zip/Postal Code: 323000
    Email:admin@bearingforworld.com
    Contact Person: Mr. William

    Copyright ? 2018?Hangzhou BFW Bearing Manufacturing Co., Ltd. All rights reserved. Email: admin@bearingforworld.com

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