键连接的选择和计算1.键的选择轴齿轮1处选择普通平头平键键128,12,8,40bmmhmmLmm;联轴器处选择普通平头平键键87,8,7,32bmmhmmLmm;轴齿轮2处选择普通平头平键键149,14,9,36bmmhmmLmm;齿轮3处选择普通平头平键键149,14,9,70bmmhmmLmm;轴齿轮4处选择普通平头平键键2012,20,12,70bmmhmmLmm;联轴器处选择普通平头平键键1610,16,10,70bmmhmmLmm;2.键的强度计算假定载荷在键的工作面上均匀分布,普通平键联接的强度条件为3210[]PPTkld查表6-2得,钢材料在轻微冲击下的许用挤压应力为100~120MPa,所以取[]120PMPa(1)轴齿轮1上键的强度计算1111170.180.50.58440TNmkhmmlLmm所以31270.181022[]44040PPMPa满足强度条件轴联轴器上键的强度计算1111170.180.50.573.532TNmkhmmlLmm所以31270.181050[]3.53225PPMPa满足强度条件(2).轴上齿轮2处键的强度计算22222317.70.50.594.536TNmkhmmlLmm所以322317.71087[]4.53645PPMPa满足强度条件轴上齿轮3处键的强度计算22222317.70.50.594.570TNmkhmmlLmm所以322317.71045[]4.57045PPMPa满足强度条件(3)轴齿轮4处键的强度计算3333310250.50.512670TNmkhmmlLmm所以33210251069.7[]67070PPMPa满足强度条件联轴器处键的强度计算3333310250.50.510570TNmkhmmlLmm所以332102510106[]57055PPMPa满足强度条件