Combined Type Needle Roller Bearings
The Combined Type Needle Roller Bearings are bearings units composed of a radial needle roller bearing and a thrust bearing or an angular contact ball bearing component. The compact and small structure, high rotation precision, can withstand a high radial load while bearing a certain axial load. . And the product structure is diverse, adaptable and easy to install.
1.Structural form of Combined Type Needle Roller Bearings
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. It can also be designed according to the user’s special structural requirements.
2. Product accuracy of Combined Type Needle Roller Bearings
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.
3. Work materials of Combined Type Needle Roller Bearings
The needle roller material is GCr15 bearing steel and 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.
4. Requirements of Combined Type Needle Roller Bearings
The combined needle roller bearing is designed to be the bearing raceway at the bearing raceway, and has certain requirements on the hardness of the bearing; or it is equipped with the IR standard inner ring for the inserting process, and the shaft hardness is not required, and the structure will be more compact.
5. Special instructions of Combined Type Needle Roller Bearings
The axial loads of NKIA and NKIB series bearings 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.
6. Standard of Combined Type Needle Roller Bearings
GB/T16643—1996 Rolling bearings Needle roller and thrust cylindrical roller combined bearings
JB/T3122—1991 Rolling bearings Needle roller bearings and thrust ball combined bearings
JB/T3123—1991 Rolling bearings Needle roller bearings and angular contact ball bearings
JB/T6644—1993 Rolling bearings Needle roller and double direction thrust cylindrical roller combination bearing sizes and tolerances
JB/T8877—2001 Rolling bearings Needle roller combined bearing Technical conditions
7. Application areas of Combined Type Needle Roller Bearings
Widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery and printing machinery, and can make the mechanical system design more compact and smart.
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