全可变液压气门机构的气门落座特性  

Valve Seating Characteristics of a Fully Hydraulic Variable Valve System

作　　者：黄玉珍[1,2] 谢宗法[1,2] 常英杰[1,2] 陈飞 李小蕊[1,2] 

机构地区：[1]山东大学机械工程学院,山东济南250061 [2]山东大学高效洁净机械制造教育部重点实验室,山东济南250061

出　　处：《内燃机学报》2017年第6期523-529,共7页Transactions of Csice

基　　金：国家自然科学基金资助项目(51375265);国家重点基础研究发展计划(973计划)资助项目(2013CB228404)

摘　　要：在BJ486EQ汽油机上开发了一种全可变液压气门系统(FHVVS),采用凸轮驱动和液压传动控制进气门开启和关闭,采用气门落座缓冲机构控制气门落座速度.建立FHVVS气门运动特性测试平台,采用激光位移传感器试验测量了FHVVS的气门升程.讨论了FHVVS的气门落座过程和特性,重点分析了两种气门落座缓冲机构的气门落座速度和反跳高度.结果表明:液压活塞侧面节流的气门落座缓冲机构显著降低了FHVVS的气门落座速度和反跳高度.与传统气门机构相比,FHVVS实现了气门平稳落座,且4缸汽油机的各缸落座特性均匀一致.A fully hydraulic variable valve system （FHV-VS）for BJ486EQ gasoline engine was developed. Its intake valves are opened by hydraulic oil which is driven by the cam. The valve seating-velocity is controlled by a valve- seating buffer mechanism. A test bench was built up to measure the valve movement characteristics of FHVVS, in which the valve lift was measured by a laser displacement sensor. The valve seating process and characteristics of the FHWS were discussed, especially the valve-seating velocity and the rebound height of the intake valve with two kinds of valve-seating buffer mechanism were analyzed. The test results show that the valve-seating velocity and the rebound height can be significantly reduced by the throttle hole in the hydraulic piston side of the valve-seating buffer mechanism. Compared with the traditional valve mechanism, steadily seating is realized in FHVVS, and the valve- seating velocity for each cylinder is uniform in the four cylinder gasoline engine.

关 键 词：全可变液压气门机构 气门落座缓冲机构 气门升程 气门落座速度 气门反跳高度 

分 类 号：TK413.4[动力工程及工程热物理—动力机械及工程]