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Sliding bearing scraping skill needs
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2. The touch angle refers to the central angle of the journal and the sliding surface of the sliding bearing.
The touch angle is too large or too small. The touch angle is too small to increase the pressure of the sliding bearing; the severe bearing will cause large deformation; the wear will be accelerated; the service life will be shortened, the touch angle will be too large; the composition of the oil film will be affected. Unsatisfactory liquid smoothness.
The experimental study indicates that the limit of the sliding bearing touch angle is 120°. When the sliding bearing wears to this touch angle; the liquid is smooth and damaged. Therefore, the sliding bearing bearing condition is not affected; the smaller the touch angle, the better.
Theoretical analysis from the conflicting force distance; when the touch angle is 60°; the conflicting moment is the most. The sliding bearing of the ㄒ椋 ㄒ椋 ㄒ椋 俑哂 500r/min; the touch angle is 60°; the sliding bearing with the speed lower than 500r/min The touch angle can be selected from 90°; it can also be used at 60°.
3. Touch the practical touch condition of the journal and the plain bearing surface; the number of practical touch points per unit area can be used to indicate that the more touch points are, the thinner and more uniform; the better the sliding bearing is scraped; the opposite; Sliding bearing scraping is not good.
Generally speaking, the more fine the touch point is, the more difficult it is to scrape. The touch point should be determined according to the function and working condition of the sliding bearing in production; the materials listed in the table below are for reference:
Sliding bearing speed.r/min) Touch point. Number of touch points on the area of ​​25 × 25 mm)
100 below 3~5
100~500 10~15
500~1000 15~20
1000~2000 20~25
The above table data can be selected for machines with 2000 and above class I and class II precision; the class III precision machine can be folded in half according to the above table data.
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