50cc四冲程发动机动力性能的优化设计

本文依据活塞式内燃机动力循环理论和现代内燃机设计思想，阐述了旨在动力性能升级的一款踏板摩托车用四冲程50cc发动机的结构设计过程。零部件结构主要从提高发动机效率、降低机械损失、改善机油润滑、提高循环充气量等几方面入手进行设计。改进后的发动机动力性能有显著提升。

Dynamic Promotion of a Type of 50cc Four Stroke Scooter Engine

Based on the dynamic cycle theory of piston internal combustion engine and the design, principle of modern combustion engine , this article introduces the dynamic promotion method of a type of a four stroke 50cc engine for scooter. Some of the engine parts had to be redesigned to promote engine efficiency , reduce machine lose , improve luburication and intake rate , etc. The result presents apparent improvement after redesign.