【作者】 傅伟成；

【导师】 林建生；

【作者基本信息】 天津大学 ， 动力机械及工程， 2004， 硕士

【摘要】 多年来,众多的内燃机研究者及专家都热衷于单缸机的试验,他们试图通过对单缸机的改进和测试来提高内燃机的性能。作者也希望通过亲手优化设计摇摆往复机构单缸机,来改进和提高内燃机的性能。本文主要介绍的内容如下:(1)首先介绍了摇摆往复机构,并对现行机构中的急回现象进行了分析,明确了本文的研究内容;(2)通过对新型机构的运动学分析,可知摇摆往复机构具有急回机构的一般特性。在保持活塞行程基本不变的前提下,可以得到一个新型机构的优化结果。这一优化结果的极位夹角为16°,即排气、压缩冲程的曲轴转角为164°,排气、压缩进展较快;进气、膨胀冲程的曲轴转角为196°,进气、膨胀进展较慢。新型机构的这一特性有助于改善燃烧过程的及时性,从而改善内燃机的性能。(3)考虑完运动时构件间存在的干涉问题后,设计了机构的各个构件。(4)通过对新型机构的动力学分析,可知摇摆往复机构虽然不能完全的消除侧压力,但是它能改变内燃机的活塞拍击时刻。从而成功避开了在气缸压力的极值附近换向的问题,新型机构的这一特性可以改善了内燃机工作的平顺性,而且可以有效的降低活塞的敲击程度及其产生的噪音。(5)由于研究时间的限制,仅完成了原机实验,不可能完成包括新型机构发动机的实验。(6)对论文内容进行了总结,并提出了进一步研究的设想。更多还原

【Abstract】 For many years engine researchers and development specialists have appreciatedthe benefits offered by performing engine development and testing on single cylinderengines. Author wish we could improve engine by applying the rocking and reciprocat-ing mechanism to the single cylinder internal-combustion engine .The main research contents of this dissertation are listed here:(1)This dissertation first introduces the rocking and reciprocating mechanism andanalyses quick return mechanism in engine. The chief research content is indicated.(2)Through kinematics analysis we find that the rocking and reciprocatingmechanism is a quick return mechanism. Later we succeed in designing an optimizedmechanism by using simulation technology, whose angle of extreme position is 16°.So its exhaust and compressing process become faster than its intake and expandingprocess. This characteristic of the new type of mechanism can improve combustibilityin engine.(3) After resolving the interference between components during the piston’s move-ment, we have designed each component for the new type of mechanism.(4) Through dynamic analysis for the new type mechanism we can get data aboutsliding block’s position, velocity, acceleration and force. We find the new type ofmechanism can change the time of piston impingement. The cylinder pressure at thetime of piston impingement is smaller than the original mechanism’s. Thischaracteristic can make piston move smoothly and reduce the noise from pistonimpingement.(5)For the limitation of research’s time, we only finished the experiment for theoriginal engine.(6)Finally, all main conclusions and further research suggestions are given.更多还原