Z398柴油机设计（气缸盖）
摘 要
本文主要介绍Z398柴油机气缸盖的设计。在本次设计中，考虑到398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398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2800r/min左右，标定功率约40kW，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250g/(kW·h)以内。本文着重讨论了气缸盖重要部位的设计要求及特点。
本人主要任务是设计Z398柴油机的气缸盖，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398柴油机的气缸盖结构进行结构设计。在阐述气缸盖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Z398柴油机气缸盖的设计依据与设计过程。同时，对气缸盖材料的选择、冷却水道的布置、进排气道的布置以及缸盖螺栓的布置等问题也进行了讨论。
关键词： 柴油机，气缸盖，冷却水道，进气道，排气道 THE DESIGN OF Z398 DIESEL ENGINE （CYLINDER HEAD）
ABSTRACT
This paper mainly introduces the design of the Z398 diesel engine cylinder head. In this design, considering the Z398 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 Z398 which designed this time is on the basis of the old Diesel 398 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 2800r/min, about 40kW calibration power, speed and the current low power of the car needs. Through the parameters and process performance control can make fuel consumption in 250g/(kW·h ).This paper discusses the design requirements and characteristics of the cylinder important parts。
My main task is to design Z398 engine cylinder head. 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 398 diesel cylinder head to design the structure. When explained the pro
