387柴油机设计(活塞连杆组)

387柴油机设计（活塞连杆组）

摘要

本文主要介绍387柴油机活塞连杆组的设计。在本次设计中，考虑到387柴油机主要应用于农业生产中的中小型机械，环境往往较为恶劣，需要内燃机具有较好的动力性能为农机产品提供足够的动力。本次设计在387柴油机基础上加大了活塞的工作行程，改球形燃烧室为W形燃烧室，使其动力性与经济性都有所提高。但由于工作行程的加大，平衡性变差，噪音与震动加大，在设计时对其采取一定的措施。燃烧系统采用直喷型，易启动，节能效果明显，可使经济性和动力性大大提高。发动机转速为3000r/min左右，12h标定功率约27kW，符合当今低速汽车对转速及功率的需求。通过参数及工艺性能的控制可使燃油消耗率保持在245g/kW.h以内。本文着重讨论了活塞连杆组部位的设计要求及特点。

本人主要任务是设计387柴油机的活塞连杆组，首先根据柴油机的性能指标对柴油机主要的性能参数进行了选择。然后在参照387柴油机的活塞连杆组进行结构设计。在阐述活塞连杆组设计过程的同时也对主要零部件的设计要点作了总结。本说明书中重点论述了387柴油机活塞连杆组的设计依据与设计过程。

关键词：柴油机，活塞，连杆

THE DESIGN OF 387 DIESEL ENGINE （PARTS OF

PISTON GROUP）

ABSTRACT

This paper mainly introduces the design of the 387 diesel engine parts of piston group. In this design, considering the 387 diesel engines are mainly applied in small and medium-sized machinery, agricultural production environment is bad, need often has better performance for internal machinery products provide enough power. The Diesel 387 which designed this time is on the basis of the old Diesel 387 and increasing the piston stroke, with its power performance and economical efficiency enhanced. However, because of the work itinerary increased, its balance became worse, noise and vibration also increased. So in this design, I have to take some certain measures. Combustion Chamber using injection type, easy to start, energy saving effect, and can make the efficiency and performance improved greatly. The engine speed is 3000r/min, about 27kW/12h calibration power, speed and the current low power of the car needs. Through the parameters and process performance control can make fuel consumption in 245g/kW.This paper discusses the design requirements and characteristics of the cylinder important parts。

My main task is to design 387 engine parts of piston group. On the first, according to the diesel’s performance target, I should to choose the main performance mark of the diesel. Then in the light of the design of 387 diesel parts of piston group to design the structure. When explained the process of the parts of piston group design, I also summarized the main parts. This thesis focused on expounding the foundation and process of the 387 diesel engine parts of piston group design.

KEY WORDS：diesel engine, the piston, the connecting rod,

目录

第一章前言 (1)

§1.1 柴油机技术概述及发展趋势 (1)

§1.1.2 柴油机技术的发展趋势 (1)

§1.2 我国柴油机技术的发展 (2)

第二章整体设计 (4)

§2.1 柴油机设计的总体要求 (4)

§2.2 柴油机的设计要求 (4)

§2.3 387柴油机简介 (5)

§2.4 柴油机主要零部件的设计 (6)

§2.4.1 活塞 (6)

§2.4.2 连杆 (6)

§2.4.3 曲轴飞轮组 (7)

§2.4.4 气缸盖 (7)

§2.4.5 机体组 (8)

第三章活塞组零件的参数选择 (9)

§3.1 活塞组的工作条件 (9)

§3.1.1机械负荷 (9)

§3.1.2热负荷 (9)

§3.1.3活塞高速滑动，润滑不良 (9)

§3.2 活塞的设计 (9)

§2.2.2 活塞的材料 (9)

§3.2 活塞头部的设计 (10)

§3.2.4 活塞裙部的设计 (13)

§3.3 活塞销的设计 (14)

§3.4 塞环和活塞环槽的设计 (16)

§3.4.1 活塞环的工作情况和设计要求 (16)