The needle roller and cage assemblies are self-contained rolling elements with a wide spacing of the two guide faces of the cage to precisely guide the needle and maintain the correct position of the needle. This type of bearing is suitable for applications where the shaft and the seat bore can be used as raceways. The shaft and housing bore raceways must be machined to the specified dimensional accuracy and geometric accuracy to ensure high rotational accuracy in the smallest space.
Code and structure characteristics of needle roller and cage assemblies:
K/KS single row / single row split
KK/KKS double row / double row split
KZK connecting rod crank pin
KBK connecting rod piston pin
KNL long cylindrical roller and retaining assembly
The DF radial needle roller and cage assemblies are available in single row K and double row K…ZW versions, and special split needle and cage assemblies are available when the integral cage cannot be installed. The bearing model is followed by “D”, which is K…D, K…ZWD.
Pre-code of needle roller and cage assemblies:
Needle roller and cage assemblies for KBK-piston pins
Needle roller and cage assembly for KZK-crank pin
WJ-Inch needle roller and cage assemblies
The needle roller and cage assemblies are rolled as a separate bearing element, with each needle being accurately guided and held by the cage. It achieves bearing design with high load capacity and high rigidity in the smallest structural space. The wide spacing of the two guide faces of the cage ensures precise guidance of the needle roller and cage assemblies.
The needle roller and cage assemblies are suitable for use as a raceway for shafts and seat holes. The highest rotational accuracy is achieved with shaft and seatway raceways with high dimensional accuracy and geometric accuracy. The metric clearance of the shaft portion depends on the tolerances of the inner and outer raceways, the needle roller difference and the operating temperature.
Needle roller and cage assemblies K, K…D type, this type of bearing has only one set of needle roller and cage assemblies, and the outer diameter is small, which is suitable for parts with particularly limited radial dimensions to withstand radial loads. K … ZW, K … ZWD type is a double row roller needle roller and cage assemblies to the heart. Since the bearing has no ferrule, the surface of the journal surface and the surface of the outer shell hole directly satisfy the surface hardness HRC60 and the surface roughness Ra value is not more than 0.63 μm.
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