单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,键与销、齿轮,P198-204,键的功用,:,用于连接轴和传动件,(,如齿轮、皮带轮等,),，使轴和传动件不发生相对转动，传递扭矩或旋转运动。,键连接,键,皮带轮,轴,键的种类,:,普通平,键,半圆,键,钩头楔,键,花键,键是标准件,标记：,普通平键,键,B,8,25 GB,/,T,10962003,半圆键,键,b,L,GB/T10992003,钩头楔键,键,b,L,GB/T15652003,b,L,L,L,b,b,书,P198,（,A,型不标,，,B,、,C,尺寸前标出）,平,键联结,的画法,A,A,A,A,A,A,A,A,A,A,A,A,钩头楔,键联结,的画法,半圆,键联结,的画法,平,键联结,的画法,标记：,键,b,L,GB/T10961979,（,A,型不标,，,B,、,C,型在规格尺寸前标出）,h,t,1,t,d-t,d+t,1,b,d,A,A,A,A,h,L,b,L,b,d-,t,d,d+,t,1,b,d,销连接,销的种类,销的种类较多,常用于零件间的连接与定位。,销,GB,/,T,119.1,B,d,l,按配合性质不同，分为,A,、,B,、,C,、,D,四种型式。,销,GB,/,T,117,A,d,l,按表面粗糙度要求不同，分为,A,、,B,两种,销,GB,/,T,91,d,l,公称直径指销孔直径，开口销实际尺寸小于公称直径。,图例,标记及说明,书,P200,销的用途及装配画法,起,连接,作用,起定位作用,起,连接,作用,开口销与槽型螺母配合使用，起防松锁紧作用。,10.4,齿轮,齿轮是机器中的传动零件，用来将主动轴的转动传送到从动轴上，以完成传递功率、变速及换向等功能。,按两轴的相对位置不同，齿轮可分为三大类：,圆柱齿轮,传递两平行轴的运动；,圆锥齿轮,传递两相交轴的运动；,蜗轮蜗杆,传递两垂直交叉轴的运动。,圆柱齿轮,蜗轮蜗杆,圆锥齿轮,齿形,:,渐开线、摆线、圆弧等齿廓,齿向,:,直齿、斜齿、人字齿,齿轮的齿形,按轮齿方向分为直齿、斜齿、人字齿,齿型轮廓曲线有渐开线、摆线、圆弧等，一般采用渐开线齿廓。,齿轮的结构,轮齿,轮毂,幅板,轮缘,键槽,轴孔,齿轮的参数,d,a,2,d,2,n,1,n,2,P,主动轮,从动轮,中心距,a,齿数,z,1,齿数,z,2,d,f,2,齿顶圆,节圆,齿根圆,齿顶圆,d,a,=m,(,z,2,),齿根圆,d,f,=m,(,z,2.5,),分度圆,d=m z,节圆,中心距,a,=,m,(,z,1,z,2,)/2,齿数,z,齿距,p,模数,m,分度圆周长,l=,d,=z p,则,d=z,p,=,m z,书,P202,单个齿轮的画法,齿顶圆,(,线,),用粗实线,分度圆,(,线,),用点划线,齿根圆,(,线,),用细实线,可省略,轮齿不画剖面线,用三条细实线表示轮齿,(,斜齿、人字齿,),的方向。,齿轮啮合的画法,剖视图,视图,端面视图,端面视图,（啮合区省略齿顶圆）,书,P204,齿轮啮合区放大图,剖视图,啮合区放大图,端面视图,啮合区放大图,复习：书,P198-204,作业：习题集,P66,，,P67,习题集,P66,32,32,35,8,1.,普通平键，键长,25,mm,，键槽距轴端,8,mm,，标键槽尺寸,25,27,10,35.3,10,2.,把轴、键、及轮装配，并画,A-A,断面图。,A-A,A,A,10,25,8,查表,P294,剖面线一致,剖面线一致,25,8,8,35.3,27,10,间隙,b,t,t,1,最大,最小,极限,偏差,公称,尺寸,极限,偏差,公称,尺寸,轴和毂,P9,毂,JS9,轴,N9,毂,D10,轴,H9,较紧,连接,一般连接,较松连接,毂,t,1,轴,t,极限偏差,公称,尺寸,半径,r,深度,宽度,b,公称,尺寸,b,h,公称,直径,d,键槽,键,轴,0.40,0.25,3.3,5.0,10,10,8,3038,+0.2,0,3.3,+0.2,0,4.0,-,0.015,-,0.051,0.018,0,-,0.036,+0.098,+0.040,+0.036,0,8,8,7,2230,2.8,3.5,6,6,6,1722,0.20,0.16,2.3,3.0,5,5,5,1217,6.0,16,16,10,5058,5.5,14,14,9,4450,5.5,-,0.018,-,0.061,0.0115,0,-,0.043,+0.120,+0.050,+0.043,0,12,12,8,3844,-,0.012,-,0.042,0.015,0,-,0.030,+0.078,+0.030,+0.030,0,+0.1,0,+0.1,0,3.3,3.8,4.3,A,A,A-A,h,d-t,b,r,d+t,1,平键和键槽的断面尺寸,查表,P294,d,习题集,P66,9-12,1.,画出用销,GB/T 119.1 A845,连接轴和齿轮的装配图。,2.,画出用销,GB/T 117 A830,将两板定位的装配图。,剖面线一致,45,8,习题,P67,7.,渐开线标准直齿圆柱齿轮的模数,m=2.5,、齿数,Z=48,，,计算分度圆、齿顶圆和齿根圆直径，,完成两视图并标全尺寸，填写参数表。,6,模数,齿数,压力角,6,x,16,m,80,56,32,20,28,24,23.3,2.5,48,20,120,113.75,125,z,书,P202,分度圆,d,=,mz=120,齿顶圆,d,a,=m,(,z+2,)=125,齿根圆,d,f,=,m,(,z-2.5,)=113.75,粗,细,粗实线,补,P3,8.,一对圆柱齿轮相啮合,模数,m,=2.5,、小齿轮齿数,Z,1,=18,、中心距,A,=60,，,完成两视图，并填写参数表。,模数,齿数,压力角,中心距,传动比,Z2,Z1,A,i,m,60,2.5,0.6,60,30,18,20,小齿轮,分度圆,d=,mZ,1,=,45,齿顶圆,d,a,=,m,(,Z,1,+2,)=50,齿根圆,d,f,=,m,(,Z,1,-2.5,)=38.75,大齿轮,中心距,a,=,m,(,Z,1,Z,2,)/2,齿数,Z,2,=,30,分度圆,d =,mZ,1,=,75,齿顶圆,d,a,=,m,(,Z,1,+2,)=80,齿根圆,d,f,=,m,(,Z,1,-2.5,)=68.75,细,粗,两分度圆相切,书,P202,i=Z1,Z2,习题集,P66,32,32,35,8,1.,普通平键，键长,25,mm,，键槽距轴端,8,mm,，标键槽尺寸,25,27,10,35.3,10,2.,把轴、键、及轮装配，并画,A-A,断面图。,A-A,A,A,10,25,8,查表,P294,剖面线一致,剖面线一致,25,8,8,35.3,27,10,间隙,习题集,P66,9-12,1.,画出用销,GB/T 119.1 A845,连接轴和齿轮的装配图。,2.,画出用销,GB/T 117 A830,将两板定位的装配图。,剖面线一致,习题,P67,7.,渐开线标准直齿圆柱齿轮的模数,m=2,、齿数,Z=48,，,计算分度圆、齿顶圆和齿根圆直径，,完成两视图并标全尺寸，填写参数表。,6,模数,齿数,压力角,6,x,16,m,80,56,32,20,28,24,23.3,2,48,20,96,91,100,z,书,P202,分度圆,d=,mz=96,齿顶圆,d,a,=m,(,z+2,)=100,齿根圆,d,f,=m,(,z-2.5,)=91,粗,细,粗实线,8.,一对圆柱齿轮啮合,模数,m,=2.5,、小齿轮齿数,Z,1,=18,、中心距,A,=60,，,完成两视图，并填写参数表。,模数,齿数,压力角,中心距,传动比,Z2,Z1,A,i,m,60,2.5,0.6,60,30,18,20,小齿轮,分度圆,d=,mZ,1,=,45,齿顶圆,d,a,=,m,(,Z,1,+2,)=50,齿根圆,d,f,=,m,(,Z,1,-2.5,)=38.75,大齿轮,中心距,a,=,m,(,Z,1,Z,2,)/2,齿数,Z,2,=,30,分度圆,d =,mZ,1,=,75,齿顶圆,d,a,=,m,(,Z,1,+2,)=80,齿根圆,d,f,=,m,(,Z,1,-2.5,)=68.75,细,粗,两分度圆相切,书,P202,i=Z1,Z2,结束！,