摘要柴油机活塞是柴油机重要运动件之一，因为它所处的环境相当残酷，即温度高、高负荷、高速度、润滑不好和冷却困难等，使其成为柴油机常见故障较多的零件之一。由于柴油机技术水平的逐步提高，4105四冲程高速柴油机活塞的频繁运转，气缸内的平均有效压力和温度急剧上升，使活塞处在如此残酷的工作条件下，理所当然，活塞成为了柴油机强化的一个最明显障碍。于是出现了相关设计的这样一个课题：要怎样保证在提高柴油机发动性能前提下，提高活塞工作的耐久性与可靠性。研究表明：通过合理详细的活塞组设计，才能有效的提高柴油机工作的耐久性和可靠性，本次设计的任务主要是4105四冲程高速柴油机活塞组的设计，主要包括活塞头、活塞裙部、活塞环、活塞销、活塞销座的设计。43922

本次设计活塞所选的材料是：耐高温，热膨胀系数小，比重小的共晶铝硅合金。通过合理的计算和校核以及合理的头部高度设计，以便有效减轻活塞机械负荷和热负荷，增强活塞寿命与耐磨性。

毕业论文关键字：柴油机：活塞：活塞裙：活塞销

 Abstract

Diesel engine piston is one of important sports a diesel engine, because its environment is quite cruel, namely high temperature high load high speed bad lubrication and cooling difficult, etc, to make it a diesel engine parts more common faults because one of the technical level of the diesel engine is gradually increased to 4105 series high-speed diesel engine piston of frequent operation, and the average effective in cylinder pressure and temperature rise sharply, driving the piston in such cruel conditions, of course, the piston become the strengthening of a diesel engine is the most obvious obstacle after appearing to relevant design of such a topic: how to ensure a diesel engine performance in improving the premise, improve the work of the durability of the piston and reliability research shows that: through the reasonable detailed piston group design, can effectively improve the reliability and durability of diesel engine work, The main task of design is 4105 series high-speed diesel engine piston group of design, including the head of the piston piston skirt piston ring the piston pin the piston pin a design.

The design of the piston selected materials are: high temperature resistant, thermal expansion coefficient little, a small proportion of the eutectic al-si alloy through the reasonable calculation and check and reasonable head height design, so as to effectively reduce the piston mechanical load and the heat load and enhance the piston life and wear resistance.

Key word: diesel engine: the piston, piston skirt: the piston pin

目录

第一章  绪 论 1

1.1选题背景和意义 1

1.2 国内外研究现状及存在的问题 1

1．3 论文的主要工作 2

1.4研究方法、步骤和措施 2

第二章  4105四冲程柴油机活塞组的设计 3

2.1活塞的工作条件和设计要求 3

2.1.1 活塞的工作条件和设计要求 3

2.1.2活塞组的作用与特点 4

2.1.3活塞的润滑 5

2.1.4设计要求 5

2.2活塞连杆的受力分析 7

2.2.1活塞的位移 8

2.2.2活塞的速度 9

2.2.3活塞的加速度