张佰力，孙常林，张玉川，赵生彦

(1.山东省交通运输厅，济南 250002 ;2. 山东大学  机械工程学院，济南250061；3. 塔斯马尼亚大学  科学与技术工程学院，霍巴特 7005；4.济南先机科技有限公司，济南250102）

    摘要：一种由两气缸组成的可变压缩比发动机，其特点是两气缸的曲柄机构反向转动，且共用同一燃烧室。理论分析了该可变压缩比发动机的燃烧室容积和气缸排量的变化规律，研制了原理样机。试验结果表明，该发动机的压缩比实现了在较大范围内的连续可变，且压缩比调节机构运行平稳可靠。

    关键词：汽油机；可变压缩比；理论计算；试验

    Abstract: This paper presents a type of VCR engine consisted of two cylinders. The main features of the engine are two cylinders crank mechanism rotates in reverse and shares one combustion chamber. This paper also analyzes the change rule of the combustion chamber volume and cylinder displacement theoretically. The principle prototype is developed. Experimental testing results of the principle prototype indicate that the compression ratio of this engine can continuously vary in a large range as well as the compression ratio adjusting mechanism operates smoothly and steadily.

    Key Words:Gasoline engine; Variable compression ratio; Thretcalculation; Experiment