Fit parameters of oil seal and shaft
source：未知
author：admin
time：2021-11-04 14:21:47
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1. Requirements for oil seal and seat hole
★ ensure the coaxiality between the oil seal seat hole and the rotating shaft.
★ when using the outer skeleton oil seal, pay attention to the selection of metal brand materials with thermal expansion coefficient similar to the seat hole material to make the skeleton, so as to ensure the firmness and detachability of the oil package.
★ the inner diameter tolerance and surface roughness of oil seal seat hole shall meet the requirements of table 3-1.
★ to ensure the sealing effect, the outer diameter and roundness of the oil seal shall meet the requirements listed in table 3-2.
表3-1 油封座孔及旋转轴的加工精度和粗糙度
|
部位
|
直径公差
|
表面粗糙度/μm
|
|
Rа≤
|
RZ≤
|
|
座孔
|
无骨架油封
|
H11
|
3.2
|
12.5
|
|
骨架油封
|
H9或H8
|
1.6
|
6.3
|
|
旋转轴
|
H9或f9
|
0.8～０.4
|
3.2～1.6
|
表3-2 油封外径与圆周公差
|
油封外径
D
|
外径公差
|
圆度公差
|
|
外包骨架式
|
内包骨架式
|
外包骨架式
|
内包骨架式
|
|
<50
|
+0.20
+0.08
|
+0.30
+0.15
|
0.18
|
0.25
|
|
50～80
|
+0.23
+0.09
|
+0.35
+0.20
|
0.25
|
0.35
|
|
80～120
|
+0.25
+0.10
|
+0.35
+0.24
|
0.30
|
0.50
|
|
120～180
|
+0.28
+0.12
|
+0.45
+0.25
|
0.40
|
0.65
|
|
180～300
|
+0.35
+0.15
|
+0.45
+0.25
|
外径的0.25%
|
0.80
|
|
300～400
|
+0.45
+0.20
|
+0.55
+0.30
|
外径的0.25%
|
1.00
|
2、旋转轴的设计要求
油封安装时，为获得造当的初始径向力，应保证唇部对旋转轴的过盈量要求，其值如表3-3所示。
表3-3 油封唇对轴的过盈
|
轴径
|
油封唇的过盈量
|
轴径
|
油封唇的过盈量
|
|
<30
|
0.5～0.9
|
80～120
|
0.8～1.3
|
|
30～50
|
0.6～1.0
|
120～180
|
0.9～1.4
|
|
50～80
|
0.7～1.2
|
180～220
|
1.0～1.5
|
油封在使用过程中的电大偏心量应加以严格控制,以确保密封效果,偏听偏心量范围见表3-4
|
|
带弹簧油封
|
不带弹簧油封
|
|
轴偏心
|
安装偏心量
|
轴偏心量
|
安装偏心量
|
|
>25
|
0.25
|
0.15
|
0.10
|
0.10
|
|
25～65
|
0.30
|
0.20
|
0.15
|
0.10
|
|
<65
|
0.40
|
0.25
|
0.20
|
0.15
|
表3-4 油封电大允许偏心量
|
|
带弹簧油封
|
不带弹簧油封
|
|
轴偏心
|
安装偏心量
|
轴偏心量
|
安装偏心量
|
|
>25
|
0.25
|
0.15
|
0.10
|
0.10
|
|
25～65
|
0.30
|
0.20
|
0.15
|
0.10
|
|
<65
|
0.40
|
0.25
|
0.20
|
0.15
|
旋转轴的表面硬度，一般取30～40HRC。 |
|
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