KW四行程柴油机连杆设计.doc

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1、目录0前言·······························21柴油机的机构参数··························21.1初始条件·····························21.2发动机类型···························21.2.1冲程数的选择························21.2.2冷却方式······························21.2.3汽缸数与气缸布置方式····················

2、···21.3基本参数·····························21.3.1平均有效压力的确定···························21.3.2行程缸径比的选择···························21.3.3气缸工作容积及缸径的选择·····················22热力学计算······························22.1热力循环基本参数的确定·························32.2个过程的热力学计算·····

3、·····················32.3示功图的绘制····························42.4示功图的调整·····························52.5有效功及有效压力的求解·····················53运动学计算······························63.1曲柄连杆机构的类型··························63.2活塞运动规律······························63.4连杆运

4、动规律······························74动力学计算·····························828/284.1质量转换······························84.2作用在活塞上的力····························84.2.1气体作用力····························94.2.2往复惯性力······························94.2.3旋转惯性力··············

5、················115连杆零件的机构设计······························125.1连杆长度确定·······························135.2连杆小头尺寸确定·····························135.3连杆大头尺寸确定·······························136连杆强度校核·······························146.1连杆小头······················

6、·········146.2连杆大头·······························167小结·······························178参考文献······························179附录附表······························17140KW四冲程柴油机连杆组设计0前言转眼大四上学期就要结束了，刚刚学习完发动机设计就迎来本次发动机设计课程设计，作为热动专业发动机设计是核心课程，这次设计时间为期三周，任务量也比较多，这次由

7、我们班主任带领我们做柴油机发动机设计，我相信通过我们的努力和老师悉心的指导，我们一定能圆满完成此次课程设计。1柴油机的结构参数28/281.1初始条件额定功率：P=140kW平均有效压力；=0.8~1.6Mpa活塞平均速度：＜18m/s1.2发动机类型1.2.1冲程数的选择选择冲程数为四冲程，即τ=41.2.2冷却方式水冷1.3基本参数1.3.1平均有效压力，初步选定增加发动机，=0.8～1.6Mpa，初选=1.31.3.2行程缸径比S/D的选择根据参考文献【内燃机学】得相应柴油机的行程缸径比在1.0至1.3

8、之间。初步选择行程缸径比为1.3，即S/D=1.3。1.3.3气缸工作容积，缸径D的选择根据内燃机学的基本计算公式：，，上面3式中发动机的有效功率，依题意为140KW发动机的平均有效压力，据1.3.1为1.3气缸的工作容积，1.2LI发动机的气缸数目，数目为4n发动机的转速,n=2700r/min活塞的平均速度，=10.98m/sS发动机活塞的行程，S=122mmD发动机气缸直径，D=102mmτ发