X2110N-15型农用柴油机配气机构设计

X2110N-15型农用柴油机配气机构设计目录摘要..................................................................................................................ⅠAbstract............................................................................................................Ⅱ前言..................................................................................................................1第一章X2110N-15型柴油机改型设计任务......................................................31.1改型设计的主要技术要求........................................................................31.2改型设计的依据及意义............................................................................3第二章X2110N-15柴油机主要性能参数的选择..............................................52.1平均有效压力...........................................................................................52.2活塞平均速度...........................................................................................62.3行程缸径比...............................................................................................72.4曲柄连杆比...............................................................................................82.5气缸中心距...............................................................................................9第三章配气机构总体布置..............................................................................103.1气门数目、布置和驱动..........................................................................103.1.1气门数目选择...................................................................................103.1.2气门的布置与驱动...........................................................................103.2凸轮轴的布置和传动.............................................................................11第四章凸轮轴与气门驱动件设计..................................................................144.1凸轮轴的设计.........................................................................................144.1.1凸轮轴的设计要求及结构...............................................................144.1.2凸轮轴尺寸的设计...........................................................................154.2挺柱的设计................................................................错误!未定义书签。4.3推杆和摇臂的设计....................................................错误!未定义书签。第五章气门弹簧的设计.....................................................错误!未定义书签。5.1气门弹簧概述............................................................错误!未定义书签。5.1.1气门弹簧作用.......................................................错误!未定义书签。5.1.2工作条件与设计要求...........................................错误!未定义书签。5.1.3气门弹簧材料的选择...........................................错误!未定义书签。5.2气门弹簧尺寸的确定................................................错误!未定义书签。5.3气门弹簧的校核........................................................错误!未定义书签。5.3.1气门弹簧的强度校核..........................................错误!未定义书签。5.3.2气门弹簧的共振校核..........................................错误!未定义书签。第六章配气机构其它零件设计......................................................................176.1气门........................................................................................................176.1.1气门材料..........................................................................................176.1.2气门构造及尺寸...............................................................................176.2气门座圈.................................................................................................216.3气门导管.................................................................................................226.4气门通路面积的校核..............................................................................22设计总结...........................................................................................................25参考文献...........................................................................................................26IX2110N-15型农用柴油机配气机构设计摘要本课题是在X6110型柴油机的基础上改型设计出X2110N-15型柴油机，即将六缸柴油机改为两缸柴油机。重点介绍了X2110N-15柴油机配气机构的设计，主要是其各零部件的设计。配气机构的功用就是实现换气过程，即根据发动机气缸的工作顺序，定时的开启和关闭进排气门，以保证气缸排出废气和吸进新鲜空气。配气机构设计的好坏直接影响发动机整体的经济性和动力性，因此配气机构的设计在发动机整体设计上占有相当重要的作用。在气门选择上，采用每缸两个气门的方案，其优点是比较简单、可靠，对于自然吸气式柴油机可以提高新鲜空气的进气量，降低气缸的热负荷，增加气缸的耐久性和使用寿命。气门的驱动采用凸轮轴—挺柱—推杆—摇臂—气门机构。凸轮轴布置形式是下置式，采用的是整体式凸轮轴，这样的凸轮轴结构简单，加工精度高，能有良好的互换性。本次配气机构的设计，主要包括进、排气门的设计，气门弹簧的设计，以及凸轮轴的设计。关键词：柴油机，改型，配气机构，气门IIThevalvemechanismdesignoftheX2110N-15AgriculturaldieselABSTRACTInthistopic,wemodifieddesignaX2110N-15dieselenginebasedontheX6110-typedieselengine.Thetwo-cylinderdieselengineisabouttoreplacethesix-cylinderdieselengine.EspeciallyintroducesthedesignofvalvetimingmechanismofX2110N-15dieselengines,mainlythedesignofitsvariouscomponents.Thefunctionofvalvetimingmechanismistorealizetheexchangeprocess,namelyaccordingtoenginecylinderworkingorder,ensurethattheintakeandexhaustvalvesopenandcloseatthepropertime.Thevalvegearplayadirectimpactontheeconomyandpowerparametersoftheengine,therefore,thedesignofgasdistributionagencyintheoveralldesignoftheengineplayaratherimportantrole.Arrangingtwo-valvepercylinder,theadvantagesarethatitisrelativelysimple,reliable,forthenaturallyaspirateddieselenginescanimprovethefreshairintothecylinder,reducethehea