1, the basic requirements

Both to make contact, journal and sliding bearing uniform fine as well as with the gap.

2, the contact angle

Refers to the journal and the contact surface of the sliding bearing on the central angle.

Contact angle can not be too large nor too small. Pressure to increase the contact angle is too small to make plain bearings, in severe cases make plain bearings have a greater deformation, accelerated wear and shorten life; contact angle is too large, it will affect the film formation, not a good liquid lubrication.

Experimental studies have shown that the limit of the sliding bearing contact angle is 120 °. When the sliding bearing wear to this contact angle, liquid lubrication is necessary to destroy. Therefore do not affect sliding bearing pressure conditions, the contact angle as small as possible.

Theoretical analysis, distance from the friction when the contact angle of 60 °, the smallest friction torque, so the recommended speed is higher than the 500r/min The sliding bearings, contact angle 60 °, speed below 500r/min the sliding bearing, The contact angle of 90 °, 60 ° can also be used.

3, the point of contact

Journal sliding bearing surface of the contact situation, the actual contact points per unit area. Point of contact the more the more detailed, more uniform, indicating that the sliding bearing scraping the better, and vice versa, said sliding bearing scraping bad. Generally speaking, the finer points of contact and the more, scraping the greater difficulty. Production should be based on performance and working conditions of the sliding bearing to determine the point of contact information listed in the following table for reference:

Sliding speed of the bearing

(r / min) point of contact

(25 × 25 mm area of ??the contact points)

100 3 to 5

100 50 010 15

500 to 100 015 to 20

1000 to 2000 20 to 25

Ⅰ and grade Ⅱ precision machinery in 25 or more above 2000 can be used on table data table data on the class III precision machinery may be halved.


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