考虑油膜润滑时含间隙铰链机构的动态性能研究

Study on the Dynamic Performance of Joint Mechanism with Considering Oil Film Lubrication Clearance

为了研究润滑间隙铰链对机构动态性能的影响,建立了一种既满足长轴颈轴承工况,又适合短轴颈轴承使用,且同时考虑了挤压油膜和楔形油膜作用的、改进的过渡力模型,以平面含间隙铰链曲柄滑块机构为研究对象,通过干摩擦和含润滑两种工况下对比分析,验证了新模型的合理性;同时,通过不同间隙值下仿真分析,研究了间隙值对含润滑间隙铰链机构动态性能的影响规律。研究结果表明:与干摩擦工况相比,考虑间隙铰链处润滑时,机构加速度振荡现象得到有效抑制,动态性能得到明显改善;同时,随着铰链处间隙值的逐渐增大,动态输出在机构死点位置附近出现了明显的偏差,且间隙值越大,偏差值越大;但是,偏差明显小于相同工况下干摩擦的结果。

In order to study the dynamic performance of mechanism with lubricated clearance joint,an improved transition force model is established,accounts for not only squeeze-film effects,but also wedge-film effects,and is applicable to both long and short bearings. Then,taking the planar slider-crank mechanism with lubricated clearance joint as study object,through the analyzing and comparing of two working conditions of dry friction and lubrication,the rationality of the new model is verified. At the same time,through the simulation analysis of the different clearance values,the influence law of the clearance values on the dynamic performance of joint mechanism with lubrication clearance is studied. The study results show that,comparing with the working condition of dry friction,when considering the joint lubrication,the acceleration oscillation phenomenon of the mechanism is effectively suppressed,the dynamic performance is improved significantly. At the same time,with the increase of clearance size,the simulation results with lubrication appear deviation in the dead position of mechanism,and the more clearance size,the more obvious deviation,but the deviation is significantly less than that of dry contact clearance joint.