Click here, learn how to choose the suitable Combined Type Needle Roller Bearing

Combined Type Needle Roller Bearing are equipped with thin and long rollers (the length of the roller is 3~10 times the diameter and the diameter is generally not more than 5mm), so the radial structure is compact, and the inner diameter and load capacity are the same as other types of bearings. The smallest diameter, especially suitable for radial support size limited support structure. Needle roller bearings should be combined with bearing rings and applications depending on the application. A needle bearing is a bearing unit that combines a radial needle bearing and a thrust bearing component.

Structure type of Combined Type Needle Roller Bearing
These bearings have a radial needle and thrust full ball, or a thrust ball, or a thrust cylindrical roller, or an angular contact ball, can withstand one-way or two-way axial load. Product accuracy dimensional tolerances and geometric accuracy are in accordance with JB/T8877. The diameters of the needles are 2μm, and the accuracy grade is G2 (GB309). The inner diameter of the inner ring bearing without the inner ring bearing meets the tolerance class F6. The radial clearance of the bearing complies with the specified value of Group 0 of GB/T4604. The special accuracy grade is in accordance with GB/T307.1. The material of the needle roller is GCr15 bearing steel, hardened HRC60-65. The inner and outer rings are made of GCr15 bearing steel and hardened HRC61-65. The cage material is high quality mild steel or reinforced nylon. Special instructions NKIA, NKIB series bearings axial load must not exceed 25% of the radial load. Supports for alternating axial loads must be installed opposite each other. The thrust bearing component must be applied with a preload of 1% of the axially rated static load. When using a plastic cage (suffix TN), continuous operation must not exceed the operating temperature +120 °C. 

The thrust bearing components should be free to move in the housing. Standard GB/T6643-1996 rolling bearing needle roller and thrust cylindrical roller combined bearing dimensions (GB-11) JB/T3122-1991 rolling bearing needle roller bearing and thrust ball combined bearing dimensions (JB-1) JB/T3123-1991 rolling bearing Needle roller bearing and angular contact ball combined bearing dimensions (JB-1) JB/T6644-1993 Rolling bearing needle roller and double-way thrust cylindrical roller combined bearing size and tolerance (JB-3) JB/T8877-2001 rolling bearing needle roller combined bearing Technical conditions (JB-12).

Application field of Combined Type Needle Roller Bearing
The combined needle roller bearing is a bearing unit composed of a combination of a radial needle bearing and a thrust bearing component. The compact needle size and high rotation precision can withstand a high axial load while bearing a certain axial load. And the product structure is diverse, adaptable and easy to install.
Combined needle roller bearings are widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery and printing machinery, and can make the mechanical system design very compact and dexterous.

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