摘要
分析了某顶置凸轮轴式配气机构凸轮与摇臂之间的作用力,计算了凸轮与摇臂之间的接触点的综合曲率半径变化和凸轮与摇臂之间的动态局部接触应力;计算了凸轮与摇臂之间的动态润滑油膜厚度;分析了凸轮与摇臂之间润滑油卷入的特点。将凸轮轮廓型线改为非对称的设计,降低了凸轮与摇臂之间接触压力角,改善了润滑状态,解决了凸轮与摇臂之间早期擦伤问题。
Acting force between engine cam and rocker arm of overhead camshaft valve train was studied, curvature variation of contact point and local dynamic contact stress between cam and rocker arm were calculated, characteristics of lubricant entrainment were analyzed, and thickness of steady-state and unsteady-state lubricant film was calculated by utilizing elastohydrodynamic lubrication theory. To optimize the valve train, the modeled lines of cam profile were designed asymmetrically, the shape of the contact zone of ram and rocker arm was modified. As a result, the contact pressure angle is decreased and the lubrication is improved. The severe wear problem of ram and rocker arm in early stage was settled.
出处
《润滑与密封》
CAS
CSCD
北大核心
2009年第2期41-45,共5页
Lubrication Engineering
关键词
配气机构
摩擦学设计
接触应力
润滑油膜
valve train
tribological design
contact stress
lubricant film
