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1、轮系习题,例1,如图,已知轮系中各轮齿数, Z1=20, Z2=50, Z2= 15, Z3=30 ,Z3=1 , Z4= 40, Z4= 18 , Z5= 54 ,求i15和提起重物时手轮转向?,解:,重物,手轮,Z1,Z2,Z2,Z3,Z3,Z4,Z4,Z5,例2,已知轮系中各轮齿数, Z1=27, Z2=17, Z3=99,n1=6000r/min,求i1H 和nH,解:1),设n1转向为正,则,2),解:,例3如图所示的外啮合周转轮系中,已知Z1=100, Z2=101, Z2=100, Z3=99,求系杆H与齿轮1之间的传动比iH1。,解:,例3如图所示的外啮合周转轮系中,已知Z1=
2、100, Z2=101, Z2=100, Z3=99,求系杆H与齿轮1之间的传动比iH1。,若将Z3由99改为100,则,例4图示圆锥齿轮组成的周转轮系中,已知Z1=20, Z2=30, Z2=50, Z3=80,n1=50r/min. 求系杆H转速。,设n1转向为正,则,2,等式右边的符号是在转化轮系中确定的。,与n1转向相同,解:,例4如图为标准圆柱直齿轮传动系统,已知Z1=60, Z2=20, Z2=25,各轮模数相等,求1)Z3 ;2)若已知n3=200r/min, n1=50r/min, n3,n1转向如图,求系杆H转速大小和方向; 3)若n1方向与图中相反时,则系杆H转速大小和方向
3、如何?,解:1)首先根据同心条件求出Z3,o1,Z1,Z2,Z2,Z3,n1,n3,o3,2),即,转速与n1一致,例4如图为标准圆柱直齿轮传动系统,已知Z1=60, Z2=20, Z2=25,各轮模数相等,求1)Z3 ;2)若已知n3=200r/min, n1=50r/min, n3,n1转向如图,求系杆H 转速大小和方向; 3)若n1方向与图中相反时,则系杆H 转速大小和方向如何?,解:3)当n1方向相反时,以-50r/min代入,则,o1,转速仍与n1一致,例5如图所示为用于自动化照明灯具上的周转轮系,已知输入轴转速n1=19.5r/min ,各轮齿数Z1=60, Z2= Z2= 30,
4、 Z3=40, Z4= 40, Z5= 120,试求箱体转速?,解:n5=0,Z1,Z2,Z2,Z3,转速与n1一致,Z4,Z5,箱体H,1,4,2,3,H,4,5,例6 已知 Z1=30, Z2=30, Z2=20, Z3=90,Z3=40, Z4=30, Z4=30, Z5=15 ,Z1=40,求i,1,3,解: i= i4H,在定轴轮系中:,在周转轮系中:,4,5,H,2,1,例7 已知 Z1=12, Z2=51, Z3=76, Z4=49, Z5=12 ,Z6=73,求此混合轮系传动比i1H,3,解:,6,在周转轮系中:,在定轴轮系中:,4,5,6,2,1,例8 如图所示轮系,已知锥齿
5、轮齿数Z1=Z4=55, Z5=50,其余各圆柱直齿轮齿数 Z1=100, Z2= Z2= Z3= Z4 =20, n6=3000r/min,转向如图,求n4、 n1大小和方向,解:,2,3,1,4,n6,在周转轮系中:,在定轴轮系中:,解得:,Example 9: The numbers of teeth of the gears in the gear train are given as Z1, Z2, Z3, Z4 , Z5 and Z6. Calculate the train ratio i1H2.,Solution: Dividing the gear train into su
6、btrains,(1)In the Planetary gear train 1-2-3-H1(=4).,(2) In the Planetary gear train 4-5-6-H2,(3) Solve the equations simultaneously,Example 10 A reducer of a hoist(提升机) is shown in Fig .Numbers of teeth of all the gears are given. Find the trainratio i15.,Solution: Dividing the gear train into subtrains,In the differential gear train 1-2=2-3-5,In the ordinary gear train 3-4-5,In the differential gear train 1-2=2-3-5,