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向心滚针和保持架组件
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| HRBN—向心滚针和保持架组件是由保持架和滚针组成的完整轴承单元，主要用于轴和轴承箱可作为滚道场合，且有以最小径向结构空间下承受高负荷和高刚性的能力。在高精度的轴和座孔滚道下，可获得较高的旋转精度；工作间隙可根据滚针、安装轴和座孔进行调整，安装十分便利，是在恶劣条件下使用的非常经济的轴承。 对于无法淬硬的轴和座孔，可使用本公司专门生产的IR标准圈进行镶套处理； 广泛用于汽车、摩托车、工程机械的传动轴和齿轮箱及连杆轴配置。 △结构形式
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| 滚道推荐设计： | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| JB/T7918—1997滚动轴承 向心滚针和保持架组件（JB-9） JB/T3372—1992连杆滚针和保持架组件（JB-2） |
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Radial Needle Roller and Cage Assemblies HRBN---radial needle roller and cage assemblies is a complete bearing unit composed of cage and needle rollers. With the capability of bearing heavy load & high rigidity in the minimum radial structural space, it is mainly used as raceway in shaft and bearing box. Under high precision shaft and bracket-hole raceway, it has a very high rotating precision. Work intervals can be regulated according to the needle rollers, installing shaft and bracket hole. Convenient for installation, it is a very economical bearing applied in harsh conditions. As to the shaft and bracket hole which can’t be quench-hardened, they can be treated by inlaying with IR standard ring specially manufactured by this company. This product can be widely used in the driving shaft, gearbox and connecting rod shaft disposition of auto, motorcycle and engineering machinery. Types of Designs: There are single-row K-type and double-row K…ZW-type for this kind of bearings. Special dissectible structure of single row K…D-type and double row K…ZW-type can be adopted for supporting in the concave neck of crankshaft when complete assembly can’t be carried out. Various structural styles, such as lathed & punched type, M & K type etc. are available for choice and use on different occasions, and it can also be designed according to the special structural requirements of customers. Product Precision Accuracy: Mutual difference of needle rollers is 2μm, and the precision class is G2 (ISO GB309). The assembly nominal width Bc is –0.20 for upper deviation and -0.5 for lower deviation. It can also be defined according to the special requirements of customers. Materials: Material for needle roller is GCr15 bearing steel. Material for cages can be quality low-carbon steel, low-alloy steel and reinforced nylon according to different occasions and requirements. Special Directions: The width of axial location is based on the assembly nominal-width Bc and conforms to the tolerance defined in H12 regulation. When plastic cages are used (suffixed with TN), operating temperature is not allowed to surpass +120℃ during continuous work. Standardized shaft and bracket-hole tolerance should be chosen and internal running clearance of standard radial can be achieved by utilizing standard needle rollers. Recommended Design for Raceway:
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