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1, the basic requirements
Axle and bearing even close contacts, but also have a certain amount of clearance.
2, contact angle
Refers to the contact surfaces of the shaft and bearing of the center point.
The contact angle is not too big nor too small. Contact angle is too small will increase bearing pressure, severe deformation of the sliding bearings have a greater, accelerated wear and shorten lifespan contact angle is too large will influence oil-film formation of liquid lubrication was not good.
Study shows that limit of bearing contact angle is 120 °. When the bearing wear of the contact angle, and liquid damage. Therefore do not affect the bearing pressure under contact angle less, the better.
From the friction from theoretical analysis, while when the contact angle is 60 °, minimum of friction moment, so it is recommended, to speeds above 500r/min sliding bearing, contact angle of 60 ° at a speed of less than 500r/min sliding bearing, antennae can be 90 ° or 60 °.
3, points of contact
Actual exposure of the journal and the bearing surface, unit area of physical access points can be used to represent. More point of contact there are, the more detailed and more uniform, bearing scraping the ground as possible, on the contrary, it represents a bad scrape of sliding bearing the Institute.
Generally the point of contact, the more detailed the more, scraping research more difficult. Production should be based on bearing performance and working conditions to identify points of contact, the information listed in the following table for reference:
Sliding bearing speed
(R/min) contact points
(Contact points on each area of 25x25 mm)
100 3~5
100~500 10~15
500~1000 15~20
1000~2000 20~25
More than 2000 or above
Level I and level II accuracy of machine can be used on table data, third-level precision machinery according to table data by half.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7904A5 NSK | 20 | 37 | 9 |
| 7303BEA NSK | 17 | 47 | 14 |