Type of needle bearing

    Type of needle bearing:
In addition to the catalogue, it can be used for general engineering bearings, such as: open drawn cup needle roller bearings (1), closed cup needle roller bearings (2), needle roller bearings with inner ring (3) and Inner ring needle roller bearings (4) SKF can also supply various types of needle roller bearings, 1, needle roller cage assembly 2, non-ribbed needle roller bearings 3, self-aligning needle roller bearings 4, combined needle roller / ball Bearing 5, combined needle roller / thrust ball bearing 6, combined needle roller / cylindrical roller thrust bearing
Drawn cup needle roller bearings
The drawn cup needle roller bearings are needle bearings with a thin stamped outer ring. Its main features are low cross-section height and high load carrying capacity. 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 (1) and closed on one side (2). 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. In the case where the journal cannot be 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 seal stamped outer ring needle roller bearing
In the case where the oil seal cannot be installed due to space constraints, the open-end or closed-end oil-sealed drawn cup needle roller bearings (3 to 5) are available. These bearings are equipped with a frictional oil seal of polyurethane or synthetic rubber filled with a lithium-based grease with good rust resistance for an operating temperature of -20 to +100 °C.
The inner ring of the oil-sealed bearing is 1 mm 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 without causing the bearing to be contaminated. 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.
4, needle bearing classification:
1). Centripetal needle roller and cage assembly
2).NA, NKI needle roller bearings
3).RNA, NK type needle roller bearing without inner ring
4).HK type drawn cup needle roller bearings
5).BK type drawn cup needle roller bearing
The drawn cup needle roller bearings mounted on the shaft end are open on both sides (1) and closed on one side (2). The base end face of the closed stamped outer ring can withstand small axial guiding forces.

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How to maintain the rolling bearing of large ball mill

Rolling bearings have strict requirements on manufacturing precision and high technical specialization. Therefore, for most types of bearings that are easy to buy, it is more cost-effective to purchase than to repair. Only in the following cases, bearing repair is considered. problem.

(1) The failure modes of the bearings used in the ball mill are mainly the wear of the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, and the ferrule or gasket still has repair value;

(2) If the bearing fails or has failed, the part has no major damage, or the precious bearing must try to extend its effective use period;

(3) The bearing has slight damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repair is easy and abandon.

Bearing repair should not only consider its economic benefits, but also consider technical factors. The repairer fully understands the corresponding technical requirements of the bearing, and the structural, technical and material characteristics of the bearing and its parts, otherwise it is difficult to ensure that the bearing repair has the desired effect.

    It is best to cooperate with professional bearing companies when repairing ball mill bearings. The reasons are: (1) the technical requirements of each process that can be repaired, and how to ensure the overall quality of the repaired bearings; (2) the use of professional bearings Many specialized experience of the factory, which can meet the process requirements reliably, efficiently and economically; (3) It is possible to order the tooling molds from professional bearing enterprises for repairing the business, which may be economical and save a lot of trouble; (4) Orders such as cages, rolling elements, rivets, etc. can be ordered from professional bearing companies, which may make the repair work simple, convenient and economical.

In addition, in the daily production, it is necessary to pay attention to the monitoring of the operation of the bearing, and to plan to repair the bearing before the failure, you can get twice the result with half the effort. At the same time, following a reasonable process, using efficient repair equipment and tools, and getting help from a professional bearing factory can help improve the economic efficiency of the company.

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