往复运动空间凸轮-齿条复合机构

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1、东北石油大学本科生机构创新设计目录第一章设计任务········································3第二章机构工作原理···································3第三章凸轮的设计3.1选用余弦加速度运动规律凸轮····················43.2用解析法设计凸轮的轮廓曲线····················43.3验证所设数值·································53.4接触强度要求·································73.5凸轮轮廓线的确定·

2、····························7第四章其他零件的设计4.1齿轮的设计21东北石油大学本科生机构创新设计·································104.2心轴的设计·································114.3滚子轴的设计·······························114.4圆柱凸轮轴的设计···························114.5电机的选型·································124.6减速器的选型··············

3、·················12第五章强度校核5.1齿轮的校核··································125.2轴的校核····································135.321东北石油大学本科生机构创新设计键的校核···································14总装配图·········································14总结·············································15参考文献··············

4、···························16工程图···········································16致谢·············································1921东北石油大学本科生机构创新设计第一章设计任务21东北石油大学本科生机构创新设计图1结构组成——往复运动空间凸轮-齿条复合机构由1机架、2转盘、3齿条、4导轮、5托轮、6输出齿轮、7导轮、8托轮、9空间凸轮组成。已知：外扭矩40kN·m大转盘直径d2.2m冲程6m冲次4次/min第二章工作原理21东北石油大学本科生机构创新设

5、计外扭矩作用在转盘2上，转盘2与输出齿轮6同轴，并一起相对固定的机架1转动；空间凸轮9通过联轴器、减速器与驱动电机相连，进行动力输入；空间凸轮9转动的同时，推动其槽内与齿条3固结的导销沿空间凸轮9上的导槽运动；空间凸轮9上的导槽是封闭曲线，因此齿条3带着输出齿轮6往复运动，即实现了转盘1的往复回转运动。第三章凸轮设计3.1选用余弦加速度运动规律凸轮原因：柔性冲击，满足速度和力的需求，应用于中、低速重载。3.2用解析法设计凸轮的轮廓曲线余弦加速度规律，位移规律：S=h[1-cos(πσ/σ0)]/2代入升程角160°S=h/2[1-cos(πσ/（160°×π/180o）)]

6、S=h/2[1-cos(1.125σ)]空间圆柱凸轮外表面展开曲线S1=h/2[1-cos(2.25σ)]S11=h/2sin(2.25σ)×2.25=1.125hsin(2.25σ)S11=1.125hsin(2.25×π/4)=tan38o=0.7m得h=0.7m，即推程0.7m.其中：最大压力角38o（满足力传动要求）。凸轮半径初定0.5m远、近休止角各20o由此得齿轮直径h/d=6/2.2d=0.26m得齿条受力0.26F/2=40kN·m21东北石油大学本科生机构创新设计F条=308kN受力分析得：Fx/308=tan380Fx=240.24kNM凸=240.24

7、×0.5=120.12kN·mP=120.12×0.24=50.45kW3.3验证所设数值3.3.1外圆柱半径圆柱凸轮的外圆柱半径应大于满足压力角条件下（α﹤[α]的许用最小外圆半径[r]）[r]=f·H/ΦH——从动件最大升程（mm）Φ——对应于最大升程时凸轮的转角（弧度）f——凸轮的尺寸系数。可得出：[r]=485mm，比所设500小，故满足条件。3.3.2圆柱凸轮槽底圆柱半径满足强度条件：工程设计中常按转矩计算的方法粗算轴径，并考虑键槽的影响，将尺寸加大30%，可得21东北石油大学本科生机构创新设计——最小槽