中高速链条套筒和销轴受限间隙条件下的界面行为调控

Chain drives are employed widely in mechanical transmission area as a kind of very important fundamental mechanical components. However, there is still a gap in product performance between the chain manufactured in our country and those in developed countries. Moreover, the gap is even more significant for the chain drives working at extreme situations such as drastic impact, high speed, heavy load and high temperature. Exploration of lubrication mechanism is vital to increase the quality of domestic chain products. Due to polygon effect in chain transmission, there are reciprocating sliding motion and vertical oscillation between the bush and the pin. The vertical oscillation generates drastic impact at high speed. The study on lubrication between the bush and the pin has long been overlooked. This project will focus on medium-high speed bush chain and roller chain,covering regions from fully supplied lubrication, starved lubrication, mixed lubrication and wear. An optical interferometric test rig will be established to observe the distribution of the lubricant film. Finite line contact mathematical models will be built to simulate the thermal elastohydrodynamic lubricant and mixed lubrication between the bush and the pin. Wear experiments will be carried out to reveal the reciprocating sliding-impact wear and fretting mechanisms. ADAMS simulation will also be used to study optimal clearance between the bush and the pin, the beneficial effect of the oil grooves and surface texture on the internal surface of the bush on collection of lubrication. Finally, by all the studies, it is hoped to realize the interface behavior control of the bush and the pin with a limited clearance. Several design principles will be put forward on the bush and the pin.

链传动在机械传动领域中广泛应用，是一种非常重要机械基础件。国产链条在产品性能上与发达国家尚有一定差距，剧烈冲击、高速、重载、高温等极端条件下工作的链条与发达国家有显著差距。润滑机理研究是提高国产链条的质量至关重要的环节。由于多边形效应，链条销轴和套筒之间的接触为受限间隙下的往复滑动加纵向振动。高速条件下纵向振动会产生强烈冲击。对套筒和销轴间润滑问题的研究长期被忽略。本项目的研究将围绕套筒链和滚子链在中高速条件下从全膜润滑-乏油/乏脂-混合润滑-磨损展开：搭建光干涉弹流润滑测量系统测量油膜分布；建立有限长线接触数值程序进行数值仿真热弹流润滑问题和混合润滑问题；开展磨损实验以揭示往复滑动-冲击磨损和微动磨损机理；使用ADAMS软件仿真套筒和销轴优化二者之间间隙、研究套筒内壁油槽和表面织构的集油增强作用。最后实现对套筒和销轴受限间隙下的界面行为调控，并提出几种套筒和销轴的设计准则。

链传动在机械传动领域中广泛应用，是一种非常重要机械基础传动形式。本项目围绕套筒链和滚子链中最容易发生磨损的套筒-销轴铰链副，研究了脂润滑下低速纯滚动往复运动多周期脂膜分布、低速下滑滚比和速度变化对润滑脂润滑性能的影响、油润滑往复-微动多周期油膜变化及表面损伤、脂润滑往复-微动转变过程中润滑状态演变与表面损伤、点接触润滑条件下自由水液滴对脂膜形成的影响、销轴-套筒表面精度对工业滚子链润滑行为影响的实验研究、销轴加工精度对工业链润滑行为影响的实验研究、运动学参数/润滑脂的成分和结构对冲击-滑动复合磨损的影响、套筒-销轴铰链副的无限长/有限长线热弹流润滑数值仿真、乏油对有限长线接触热弹流润滑的影响、混合润滑条件下的间歇运动数值仿真、数值仿真研究套筒内壁油槽和表面织构的集油增强作用等方面的工作。 . 本项目是东华大学和青岛征和工业股份有限公司的产学研合作课题，本项目对厘清链传动润滑和磨损机理、推进对国产工业链的研究的科学关注、提高国产链条的质量具有显著意义。 . 本项目发表英文SCI收录期刊论文19篇；中文期刊论文13篇；申请专利8项，其中授权发明专利5项，授权实用新型1项。参加国际会议13人次，国内会议7人次，项目组成员出国交流学习1人次。邀请国外专家访问我校1人次，邀请国外专家为项目组研究生授课2个月。获得国内学术会议优秀论文奖2次，国际会议最佳论文奖2次、优秀海报奖2次。