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Relation between ball circuits and load rating
The HUACHENG linear bushing includes ball circuits that are spaced equally and
circumferentially. The Icad rating varies according to the loaded position on the
circumference.
The value in the dimension table indicates the Icad rating when the Icad is placed
on top of one bail circuit,if the HUACHENG linear bushing is used with two ball
circuits loaded uniformly,the Icad rating will be greater,The following table shows
the values by the number of ball circuits in such cases: |
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Sample Calculations
1.Obtaining the rated life Land lifespan Lh of the HUACHENG linear bushing used in
the following conditions:
Linear bushing: LM20
Stroke length: 50mm
Number of strokes per minute: 50cpm
Load per bush: 490N
The basic dynamic load rating of the linear bushing is 882N from the dimension table.
From equation(I),therefore,the rated life L is obtained as Iollows: |
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| From equation(2),the lifespan Lh is obtained as follows: |
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2.Selecting the linear bushing type satisfying the following conditions:
Number of linear bushing used: 4
Stroke length: Im
Traveling speed: 10m/min
Number of strokes per minute: 5cpm
Lifespan: 1 0,000hr
Totalload: 980N
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| From equation(2),the travelling distance with in the lifespan is obtained as follows: |
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| From equation(1 ),the basic dynamic load rating is obtained as follows: |
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Assume the following with a pair of shafts each with two linear bushings:
fc=0.81 ,fw=ft=fh=l
As a result,Lm30 is selected from the dimension table
as the HUACHENG linear bushing type satisfying the value of C |
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