载荷冲击时歪斜滚子副的动态润滑问题研究

Study on Dynamic Lubrication of Inclined Roller Pair under Load Impact

考虑常温条件下轴承歪斜状态时,滚子副在载荷冲击工况下的瞬时动态润滑问题,分析载荷冲击及歪斜角对滚子副动态润滑的影响。结果表明:膜厚及压力的变化很大程度上取决于油膜的分散与聚拢运动,负荷突增会导致油压陡增、聚拢运动强化、膜厚减薄、油膜接触区扩张;载荷冲击时,与未歪斜时轴承滚子的膜厚和压力相比,歪斜后轴承滚子压力的最大峰值随时间推移明显增大,最小膜厚的变化幅度增大;实际工况下多数时刻,歪斜滚子副的最小膜厚变得更薄,最小膜厚处为滚子端部。

Considering the impact of load,the lubrication of the bearing inclined roller pair under transient dynamic impact at room temperature is explored,and the influence of load impact and the effect of inclination angle are discussed.The results show that the changes of film thickness and pressure largely depends on the extrusion and separation movement of the oil film.The sudden increase of load makes the oil pressure increase sharply,thus,the extrusion movement strengthens,the film thickness decreases,and the contact area of the oil film expands.Compared with the film thickness and the pressure of the bearing roller before inclining,the maximum peak pressure of the bearing roller after inclining significantly increases over time,and the changing range of the minimum film thickness also increases.Most of the time under actual working conditions,the minimum film thickness of the inclined roller pair becomes even thinner,and the roller end is of the minimum film thickness.