1, the basic requirements
Should make the axle neck and bearing even close contact, but also have a certain clearance.
2, contact angle
Refers to the contact center shaft and bearing angle.
The contact angle is not too big nor too small. The contact angle is too small will cause the sliding bearing pressure increases, serious when can cause the sliding bearing large deformation, accelerated wear, shorten the service life; the contact angle is too large, will affect the oil film formation, no liquid lubrication good.
Experiments show that, the sliding bearing contact angle limit is 120 °. When the sliding bearing wear to the contact angle of liquid lubrication to destruction. Therefore, in the premise of not affecting the sliding bearing pressure conditions, the smaller the contact angle is better.
From the analysis of friction torque theory, when the contact angle is 60 °, small friction moment, therefore, the sliding bearing speed higher than 500r/min, contact angle with 60 DEG sliding bearings, speed is lower than 500r/min, the contact angle can be 90 degrees, also can use 60 °.
3, the contact point
The actual contact between the shaft and bearing surface, available unit actual contact area point to represent. Contact point more, thinner, more uniform, said sliding bearing scraping the better, on the contrary, said sliding bearing scraping is not good.
Generally speaking, the contact point of the more detailed, scraping difficulty is greater. Should be determined according to the properties of contact points and working conditions in the production of sliding bearing.



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