NSK tapered roller bearing low friction technology evolution

NSK tapered roller bearing low friction 2020 - evolution of technology 01 - 09 taper roller bearing friction taper roller bearing friction theory, Aihara sort of tapered roller bearing friction for: 1) On the surface of the outer ring raceway surface and roller rolling rolling friction TR. 2) Roller end face and inner ring guard sliding friction TS; 3) Sliding friction roller and cage ( Very low) ； Lubricating oil mixing resistance. Among them, TR and TS is the main friction of tapered roller bearings, also is the main control to realize low friction. For further anti-friction should focus on lubricating oil mixing resistance. Tapered roller bearing NSK six generations of tapered roller bearing friction classification low friction technology evolution by optimizing the first generation of tapered roller bearing roller end face contact with the guard position, improve the roller end face and the surface roughness of the inner circle big guard to reduce TS, compared with the conventional standard bearing, the whole operation process anti-friction 20%. Roller end face contact with the guard position conventional standard bearing and low friction bearing friction torque compared to the second generation of tapered roller bearing by optimizing the bearing internal structure parameters to reduce the TR. When the design focusing on the low friction bearing structural parameters ( Such as contact Angle, number of roller, roller, roller diameter, length, etc. ) , the bearing performance of other requirements ( Such as life and stiffness) Is reduced. Therefore, tapered roller bearings are usually used in pairs, by optimizing the 2 sets of bearing sizes and balance the bearing structural parameters, on the premise of ensure the bearing life and stiffness can achieve the goal of anti-friction. Bearing structure generation 1 and generation 2 pairs of bearing friction torque compared to the third generation of tapered roller bearings by using the newly developed long life of the material and heat treatment technology ( TF series) To decrease the size of bearing, make its more than 2 generations further anti-friction bearings. Fourth generation optimization of convex cone roller bearings, suppress the occurrence of load ( Local surface contact stress increase) 。 Third generation compared 4th generation tapered roller bearings, normal load and overload, life improved; Stiffness increase; Low friction bearing weight loss of about 20%, 30%. Third and fourth generation of bearing roller and raceway contact stress and the contrast of convex friction torque contrast the fifth generation of tapered roller bearing on lubricating oil mixing resistance. Plastic cage, control flow into the bearing lubricating oil quantity, according to the result of flow analysis to determine the plastic cage shape. Through the narrow cage and inner ring little penal spacing to reduce the oil flow area; The cage filled bearing internal space. To ensure adequate lubrication conditions, anti-friction 20%. With plastic cage of tapered roller bearing cross section fourth and fifth generation bearing friction torque test compare the sixth generation of tapered roller bearings normally used in the transmission of high torque output, The intermediate shaft and differential shaft) 。 Rotates at low speed TS significantly affect total friction moment, is to further reduce the TS as the goal, further improve the roller end face and inner ring surface contact condition between the big guard. Low speeds up to 60% and anti-friction anti-friction up to 20% in the whole speed range. Fifth and sixth generation of bearing friction torque test results contrast source: the Motion& 控制》