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Thrust Ball Bearing 51120

产品分类 :

服飾及紡織->配件->包包配件

产品规格

Model No: 51120

Country	CN
Brand	NXZ
Packing	Standard Export Package
Payment Term	L/C,T/T

产品描述

Thrust Ball Bearing


 


Thrust
ball bearings are separable and their limit rotational speed is low.


Structures:


1.51000
type single-direction thrust ball bearings, this type of bearing can only
accommodate axial load on one direction and can control the axial movement on
one direction of the shaft and housing.


2.52000
type double-direction thrust ball bearings, this type of bearings can
accommodate axial load on double direction and can control the axial movement
on double direction of shaft and housing.


3.
560000 type thrust angular-contact ball bearing, as this structure can carry
axial load and radial simultaneously.


Cage materials


When
the outside diameter is equal or lesser than250mm, thrust ball bearings generally adopt pressed
steel sheet cages, when the outside diameter is more than250mm,it will adopt solid cages.


Minimum axial load


When
the thrust ball bearing is operating, if the applied axial load is too small,
the axial direction is not tightly pressed, then acted by centrifugal force,
the steel ball will slip and displace and destroy the normal operation of the
bearings. To avoid the occurrence of such case, an axial load, Famin must be
applied when the thrust ball bearings is working. The calculating formula is:


In
the equation, Famin      Minimum axial
load  (kN)


                 A       Minimum load constant


                 N       Revolution            (r/min)


Minimum
load constant A is showing in the bearings dimension table. If the applied
axial load is small, a spring must be used to preload the bearing.


Permissible tilt angle


The
double supporting surface of thrust ball bearings should be parallel. The axis
center line should be square with shell supporting surface, if this is not
assured, it can compensate by adopting spherical housing washer and
self-aligning washer. 


Tolerance


The
tolerance value of thrust ball bearings is showing in the section [the
tolerance of rolling bearing".


Dynamic equivalent axial load


Whenα=90°,thrust
ball bearings can only carry axial load and its dynamic equivalent axial load
is: Pa=Fa


Whenα≠90,  acted by constant and invariable radial and
axial loads, the dynamic equivalent axial load is: Pa=XFr+YFa


See
Annex Table 1 for the coefficients of X and Y.


Static equivalent axial load


Whenα=90°,
the static equivalent axial load is: P0a=Fa;


Whenα≠90°,
the static equivalent axial load is: P0a=2.3Frtanα+Fa.


Where:
For double-direction bearings, this equation is applicable to the status when
the ration of radial load and axial load is an arbitrary value; for
single-direction bearings, when Fr/Fa≤0.44ctgα, the
equation is reliable; when, the Fr/Fa＞0.67ctgα,
the equation can still give satisfactory P0avalue, but not very conservative.


 


Table 1    Value
of X and Y 

<table class="MsoNormalTable" style="border:none;" cellspacing="0" cellpadding="0" border="1">
<tbody>
<tr>
<td rowspan="3" style="border:solid windowtext 1.0pt;" width="50">

α1)

</td>
<td colspan="2" style="border:solid windowtext 1.0pt;" width="97">

Single-direction
Bearings2)

</td>
<td colspan="4" style="border:solid windowtext 1.0pt;" width="231">

Double-direction
Bearings

</td>
<td rowspan="3" style="border:solid windowtext 1.0pt;" width="56">

e

</td>
</tr>
<tr>
<td colspan="2" style="border:solid windowtext 1.0pt;" width="97">



 
</td>
<td colspan="2" style="border:solid windowtext 1.0pt;" width="140">

<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image004.gif" width="40" height="36" />

</td>
<td colspan="2" style="border:solid windowtext 1.0pt;" width="91">

<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" width="40" height="36" />

</td>
</tr>
<tr>
<td style="border:solid windowtext 1.0pt;" width="72">

X

</td>
<td style="border:solid windowtext 1.0pt;" width="25">

Y

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

X

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

Y

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

X

</td>
<td style="border:solid windowtext 1.0pt;" width="21">

Y

</td>
</tr>
<tr>
<td style="border:none;" width="50">

45º 3)


50º


55º


60º


65º


70º


75º


80º


85º

</td>
<td style="border:none;" width="72">

0.66


0.73


0.81


0.92


1.06


1.28


1.66


2.43


4.8

</td>
<td style="border:none;" width="25">

1

</td>
<td style="border:none;" width="70">

1.18


1.37


1.6


1.9


2.3


2.9


3.89


5.86


11.75

</td>
<td style="border:none;" width="70">

0.59


0.57


0.56


0.55


0.54


0.53


0.52


0.52


0.51

</td>
<td style="border:none;" width="70">

0.66


0.73


0.81


0.92


1.06


1.28


1.66


2.43


4.8

</td>
<td style="border:none;" width="21">

1

</td>
<td style="border:none;" width="56">

1.25


1.49


1.79


2.17


2.68


3.43


4.67


7.09


14.29

</td>
</tr>
<tr>
<td style="border:solid windowtext 1.0pt;" width="50">

α≠90º

</td>
<td style="border:solid windowtext 1.0pt;" width="72">

1.25tanα×


(1-<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image006.gif" width="13" height="33" />sinα)

</td>
<td style="border:solid windowtext 1.0pt;" width="25">

 

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image008.gif" width="20" height="33" />tanα×


(1-<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image010.gif" width="13" height="33" />sinα)

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image012.gif" width="19" height="33" />tanα×


(1-<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image010.gif" width="13" height="33" />sinα)

</td>
<td style="border:solid windowtext 1.0pt;" width="70">

1.25tanα×


(1-<img src="file://C:/Users/liwj/AppData/Local/Temp/msohtmlclip1/01/clip_image006.gif" width="13" height="33" />sinα)

</td>
<td style="border:solid windowtext 1.0pt;" width="21">

 

</td>
<td style="border:solid windowtext 1.0pt;" width="56">

1.25tanα

</td>
</tr>
</tbody>
</table>

Notes: 1)
For α`s medium value, use linear interpolation to calculate the values of X, Y
and e.


      2) Fa/ Fr≤e is not
applicable to single-direction bearings.

      3) For thrust bearings withα>45°, use interpolation method to calculate the
value of whenα=45°.nxzjck.com

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