摘要
气缸套磨损后,气缸套表面形状发生变化,活塞环运动时收缩楔面的角度也相应地改变,从而影响了各个冲程中润滑油膜的厚度。在做功冲程时,磨损的气缸套表面形状不利于摩擦副润滑油膜的形成,更进一步加剧了气缸套的磨损过程。建立了活塞环-气缸套摩擦副的二维瞬态流体动力润滑分析模型和磨损模型,分析了气缸套的润滑、磨损特性,提出了一种新型气缸套修形方案,以减缓气缸套的磨损进程,实现长寿命的设计要求。研究表明,适当的气缸套修形方案可以使气缸套的磨损率降低15%,同时考虑到修形增加的气缸套锥形尺寸,综合可使气缸套使用寿命延长23%。
Profile of cylinder liner will be changed once cylinder liner is worn. Movement wedge angle of piston ring will also undergo the corresponding change, and this affects thickness of lubricant film in each stroke. The worn cylinder liner is unfavorable to formation of lubricant film, but may further aggravate the wear process of cylinder liner. This paper established the two-dimensional numerical models of hydrodynamic lubrication and wearing for piston ring-cylinder liner friction pair, and analyzed the characteristics of lubrication and wearing, and proposed a new modification scheme for cylinder liner to reduce the cylinder liner wearing for durability. Research shows that, the appropriate modification scheme of cylinder liner can reduce wear ratio by 15%, and if combining the approach of increased size by shape modification, the life of cylinder liner can prolong by 23%.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2009年第6期563-568,共6页
Transactions of Csice
基金
国家"863"基金项目(2008AA7045008)
关键词
气缸套
润滑
磨损
修形
Cylinder liner
Lubrication
Wear
Modification
