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ID:9273166
大小:1.29 MB
页数:33页
时间:2018-04-26
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1、华南农业大学机械设计课程设计计算说明书设计题目:二级圆柱齿轮减速器班级:---------------------学号:---------------------设计者:---------------------指导老师:---------------------32目录一、设计任务书················································2二、传动方案的拟定············································2三、电动
2、机的选择··············································2四、传动比的分配··············································4五、传动系统的运动和动力参数计算······························4六、减速器传动零件的设计计算··································5高速圆柱齿轮传动的设计计算··································5
3、32低速圆柱齿轮传动的设计计算··································9高速轴的设计················································13中间轴的设计················································17低速轴的设计················································22七、传动零件的润滑·······················
4、·····················26八、减速器密封················································27九、箱体及附件的结构设计和选择································27十、设计总结32··················································29十一、参考文献················································30一、设计
5、任务书1、设计任务设计用于带式运输机的传动装置,要求传动系统中含有两级圆柱齿轮减速器。2、原始数据输送带有效拉力F=4100N输送带工作速度v=0.7m/s(允许误差±5%)输送带滚筒直径d=330mm减速器设计寿命为5年3、工作条件两班制工作,常温下连续单向运转,空载启动,载荷平稳,室内工作,环境有轻度粉尘,每年工作300天,减速器设计寿命10年,电压为三相交流电(220V/380V)二、传动系统方案的拟定带式输送机传动系统方案如下图所示。32图1带式输送机由电动机驱动。1——电动机,2、6—
6、—联轴器,3——二级减速器,4、5——齿轮,7——滚筒。三、电动机的选择1、电动机容量设:——输送机滚筒(4轴)至输送带的传动效率——联轴器效率=0.99——闭式圆柱齿轮传动效率=0.97——一对滚动轴承效率=0.99——输送机滚筒效率=0.96估算总效率:则得:故工作机所需电动机功率:32由得应取为4kw。2、电动机转速的选择输送机滚筒工作转速型号功率kw同步转速r/min满载转速r/min总传动比ⅠY122M-441500144035.53ⅡY132M-64100096023.67根据上表,
7、选用Y132M-6型三相异步电动机,额定功率中心高伸出部分用于装联轴器段直径和长度分别为D=28mmE=80mm四、传动比的分配总传动比则两级圆柱齿轮减速器的总传动比:高速机和低速级传动比分别为:传动系统各传动比分别为:五、传动系统的运动和动力参数计算传动系统各轴的转速、功率和转矩计算如下:320轴(电动机轴)1轴(减速器高速轴)2轴(减速器中间轴)3轴(减速器低速轴)4轴(输送机滚筒轴)将上述计算结果和传动比及传动效率汇总如下表:32六、减速器传动零件的设计计算高速级圆柱齿轮传动的设计计算1、
8、选定齿轮类型、精度等级、材料及齿数1)按照之前选用的传动方案,选用直齿圆柱齿轮传动。2)运输机为一般工作机器,速度不高,故选用7级精度(GB10095—88)。3)材料选择。由表10—1选择小齿轮材料为40Cr(调质),硬度为280HBS,大齿轮材料为45钢(调质),硬度为240HBS,二者硬度差为40HBS。选小齿轮齿数,大齿轮齿数,取。2、按齿面接触强度设计由文献(1)设计计算公式(10—9a)进行试算,即(1)确定公式内的各计算数值1)试选载荷系数。2)计算小齿轮传递转矩。3)由文献(1)
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