Air Filter High Efficiency 1261817 High Precision Hydraulic Lubricating Oil

Design features of combined needle roller bearings

Combined needle roller bearings form a composite load-bearing unit ‌ by integrating radial needle roller bearings with thrust bearings (such as thrust ball, thrust roller or angular contact ball bearings), and its core design features are as follows:

I. Structural Integration and Functional Integration

Youdaoplaceholder0 composite bearing design ‌

Simultaneously withstand high radial loads and unidirectional/bidirectional axial loads

Youdaoplaceholder0 Radial load-bearing ‌ : Relying on slender needle rollers (diameter ≤5mm, length-to-diameter ratio ≥2.5), the radial load capacity is greatly enhanced. Under the same inner diameter, the outer diameter size is the smallest ‌.

Youdaoplaceholder0 Axial load ‌ : Axial force transmission ‌ is achieved by combining thrust components (such as thrust ball bearings for light axial loads and thrust roller bearings for heavy axial loads).

Youdaoplaceholder0 typical combination type ‌ :

NKX type: Needle roller + thrust ball bearing, suitable for high-speed scenarios with light axial loads ‌;

NKXR type: Needle roller + thrust roller bearing, stronger axial load-carrying capacity ‌;

NKIA/NKIB type: Needle roller + angular contact ball/three-point contact ball bearing, supporting bidirectional axial force ‌

Youdaoplaceholder0 Compact space optimization ‌

The adoption of stamping outer ring (hardening treatment of thin-walled steel plate) or solid ring design significantly reduces the radial installation space ‌;

Some models remove the inner ring and directly use the journal as the raceway, further compressing the structural dimensions ‌.

Ii. Performance Enhancement Design

Youdaoplaceholder0 high load-bearing capacity and impact resistance ‌

The needle roller full loading design (without cage) can increase the radial load capacity and is suitable for heavy-load low-speed conditions ‌;

The solid ring structure enhances rigidity, resists vibration deformation, and is suitable for scenarios such as mining machinery and machine tool spindles ‌.

Youdaoplaceholder0 Sealing and lubrication optimization ‌

The outer ring of the stamping is bent at both ends to form a labyrinth seal, which prevents dust and grease leakage ‌;

The cage reserves a large capacity of grease space to extend the maintenance cycle (such as NAST type roller bearings) ‌

Iii. Installation and Adaptation Features

Youdaoplaceholder0 integrated installation ‌

The press-in design simplifies the assembly process and eliminates the need for auxiliary components such as end covers and positioning rings ‌;

Some models (such as AXN type) are custom-made for precision ball screws and are directly embedded in the transmission system ‌.

Youdaoplaceholder0 Shaft system compatibility ‌

The journal surface needs to be hardened and ground to HRC58-62 to replace the inner ring raceway function ‌;

The shaft is allowed to be slightly skewed from the housing hole, but the inclination Angle must be controlled to be ≤1° to avoid edge stress concentration ‌