采煤机截割部传动系统的几何参数设计毕业设计论文 下载本文

采煤机轴三的转矩

T3:

T3?9.55?106P3384 ?9.55?106?n3872T3?4206000N?mm

查的齿轮的齿宽系数

?d:取

?d?0.4

?d?0.4

MPa 查的齿轮的接触疲劳极限?Hlim:?Hlim4??Hlim5?1400初步计算的齿轮的许用接触应力??H?:??H4??0.9?Hlim4?0.9?1400

??H4??1260MPa

??H5??0.9?Hlim5?0.9?1400??H5??1260MPa

Ad值:取Ad?90

计算小齿轮的直径d4:

d4?Ad3?d??H?T3?2u?142060001.8?1?90?3??195.8 取2u0.4?12601.8d4?200mm

计算齿轮齿宽b:

b??dd4?0.4?200

b?80mm

2)采煤机二级齿轮的校核计算 计

齿

v4:

v4??d4n360?1000???200?87260?1000

v4?9.13ms

齿轮的精度等级选择7级精度

z5?i45z4?1.8?25?45 则计算齿轮的齿数z和模数m:初取齿数z4?25;z5?45

m4?d4z4?20025?8

m4?8

m4?8

z4?d4m4?2008?25z4?25

z5?i45z4?1.8?25?45 进行圆整

后z5?45

查的齿轮的使用系数KA:KA?1.5 查的齿轮的动载系数KV:KV?1.1 计算齿间载荷分配系数KHa:Ft?KAFt1.5?42060??788.6Nmm b802T32?4206000??42060N d4200?a??1.88?3.2?????11??1??1??cos??1.88?3.2????1.68???2545??z4z5??

?a?1.68 Z??4??a4?1.68??0.8833

Z??0.88 KHa?11??1.2920.882Z?

KHa?1.29

计算齿轮齿向载荷分布系数KH?:

KH?22??b???b??3?????A?B?1?0.6??C?10b?d??d?? ?4?????4?22??80???80??3?1.11?0.16?1?0.6??????0.47?10?80?200??????200?

KH??1.18

计算齿轮的载荷系数K:K?KAKVKHaKH??1.5?1.1?1.29?1.18

K?2.51

查的齿轮的弹性系数ZE:ZE?188MPa 查的齿轮的节点区域系数ZH:ZH?2.5 查的齿轮的接触最小安全系数SHmin:SHmin?1 计

th:

th?2?8?300?15

th?72000h

计算应力循环次数NL:估计齿轮应力循环次数107?NL?109,查得m?8.78

?Ti?NL1?60??nithi??T??

i?1?max?nm?Ti??60?n1th???T??i?1?max?n8.78?thi th?60?1?872?72000?18.78?0.2?0.58.78?0.5?0.28.78?0.3NL4?7.58?108

??

由结果可知原估计应力循环次数正确

NL5?NL4i45?7.58?1081.8NL5?4.21?108

查的齿轮的接触寿命系数ZN:ZN4?1.05,ZN5?1.1 计算齿轮的许用接触应力??H?:

??H4???Hlim4ZN4?1400?1.05SHmin1

??H4??1470MPa

??H5???Hlim5ZN5?1400?1.1SHmin1

??H5??1540MPa

对结果进行验算:?H?ZEZHZ?2KT3u?1 ?2ubd4

?188?2.5?0.88?2?2.51?42060001.8?1?280?2001.8

?H?1325MPa???H4?

由计算结果可知,接触疲劳强度符合要求。 3)确定齿轮传动的主要尺寸 计

d4?m4z4?8?25?200mm

d4?200mm

d5?m4z5?8?45?360mmd5?360mm

a?

计算两个齿轮的中心距

a?280mm

a:

m4?z4?z5?8??25?45??22

计算齿宽b:b??dd4?0.4?200?80mm 取b4?80mm,

b5?80mm

根据齿根弯曲疲劳强度进行验算: 计

齿

Y?:

Y??0.25?0.75?a?0.25?0.751.68

Y??0.70

计算齿轮齿间载荷分配系数

KFa?1.4

KFa:

KFa?1Y??10.70

计算齿轮齿向载荷分布系数KF?:bh?80?2.25?8??4.45

KF??1.1

计算齿轮载荷系数

K?2.54

K:

K?KAKVKFaKF??1.5?1.1?1.4?1.1

查得齿轮的齿形系数YFa:YFa4?2.62,YFa5?2.36