- 3
N = 60 ´ jn ´ L = 60 ´ 1 ´ 10 ´ 1 ´ 12000 = 720 2 h
(2-11) (2-12) (2-13)
Z N = 8 7
= 8 7
= 3 . 3
s N ] = Z N [ sq H ] = 3 . 3 ´ 220 = 726 Mpa [
2
⑥ m d 1 :
æ 3 ö . 25 Z . 25 ´ 156 ö æ 3 2 e
÷ m d ³ KT = 1 . 1 ´ 683098 ´ . 17 mm ÷ = 2494 1 2 ÷ s Z 220 ´ 40 è ø è h 2 ø
⑦ 初选 m 2 , d 1 的值: 查表取 m=6.3, d1 =63。
2
m d . 47 > 2494 . 17 1 = 2500
2
2
(2-14)
⑧ 导程角:
tan g =
mz 6 . 3 ´ 2 1
= = 0 . 2 d 63 1
(2-15)
g = arctan 0 . 2 = 11 . 3 °
⑨ 滑动速度 V s :
V s =
p d 1n 1
60 ´ 1000 ´ cos g
=
63 ´ 0 . 02 p - 5
= 6 . 7 ´ 10 m / s
60 ´ 1000 ´ cos 11 . 3 °
(2-16)
⑩ 啮合效率
- 5
由 V . 7 ´ 10 m / s 查表的 v = 1° 16 ' s = 6
h 1 =
tan g tan 11 . 3 °
= 0 . 2 / 0 . 236 = 0 . 896
tan g + f v tan( 11 . 3 ° + 1 . 8 ° )
(2-17)
11 传动效率h:
取轴承效率 h 2 = 0 . 99 ,搅油效率 h 3 = 0 . 98
h = h h h . 845 ´ 0 . 99 ´ 0 . 98 = 0 . 82 1 2 3 = 0
6 -5
T2 = T i ´ h = 9 . 55 ´ 10 ´ 8 . 723 ´ 10 ´ 20 ´ 0 . 82 / 0 . 02 » 684670 . 3 N · mm 1 ´ 2
12 检验 m d 1 的值: