| Citation: | SUN Minjie, ZHAO Lifeng, ZHANG Tao. Influences of outerring misalignment on stiffness characteristics of lubricated and preloaded ball bearing[J]. Journal of Aerospace Power, 2026, 41（4）：20240293 doi: 10.13224/j.cnki.jasp.20240293
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In order to investigate effects of outering misalignment on the contact and stiffness characteristics of lubricated and preloaded ball bearing, the geometry and force equilibrium relationship for ball bearing with outering misalignment was established and a new method was proposed for computation of the stiffness matrix considering lubrication. Combined with ball-raceway separation condition and ball-bearing-spindle iteration method, a stiffness matrix of preloaded ball bearing with certain outerring misalignment in a lubricated bearing-spindle system was analyzed. The results showed that the non-contact area between the ball and the inner ring occurred under constant force preload with a large outering misalignment. When lubrication was considered, the max. contact angle was reduced notably in constant force preload while the max. contact force was increased significantly in fixed position preload with certain outerring misalignment. Under constant force preload, lubrication weakened the stiffness of the bearing when the outerring misalignment was small while increased the stiffness with a large outerring misalignment. Under the fixed position preload, the stiffness of the bearing increased gradually with the increase of the rotational speed as well as outerring misalignment.
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