法向模数

Mn=192cos8°/32=5.94, 取 Mn=6.0

ε

β

=bsinβ/(

π

Mn)=82sin8°/(

π

*6)=0.61

Z

V1

=Z

V2

=Z

1

/cos

3

β=32/cos

3

8°=32.95

查图

7-14 得 ε

α

=2x0.027Z=2x0.027x32=1.73

ε

γ

=ε

α

+ε

β

=1.73+0.61=2.34,查图 7-13 得 K

α

=1.22

计算载荷

F

tC

=K

A

K

V

K

β

K

α

F

t

=1.5x1.2x1x1.22x3.98x10

4

=8.74 x10

4

N

法向载荷

F

n

= 8.74 x10

4

/(cos20°cos8°)=9.39 x10

4

 N

查图

7-19 得 Z

ε

=0.825

总接触线长度

L=

β

ε

cos

2

Z

b

=

°

8

cos

825

.

0

82

2

=121.66

U=Z

2

/Z

1

=1

综合曲率

r

ρ

1

=

α

β

sin

cos

2

1

d

u

u 1

+

=

°

°

20

sin

192

8

cos

2

x2=0.06

查表

7-7 得 Z

E

=189.8

MPa

齿 面 接 触 应 力

σ

H

=Z

E

r

L

Fn

ρ

=189.8

06

.

0

66

.

121

10

39

.

9

4

×

×

=1291.61MPa 查 图 7-26 ， 接 触 疲 劳 极 限 应 力

σ

Hlim

=720MPa

按使用寿命一年计算，应力循环次数

N

1

=N

2

=1000 x 60 x 300 x 24=4.32 x10

8

查图

7-27 得 Z

N1

=Z

N2

=1.04

查图

7-28 得 Z

W1

=Z

W2

=1.15，取 S

H

=1，则

2