Sliding bearing

Abstract

A helically continuous projection 1 a is formed around a sliding surface 1 A of a sliding bearing 1 at a given pitch p . The surface roughness h of the sliding surface 1 A, including the projection 1 a, is chosen to be equal to or less than one-half the height H of the projection. This provides a sliding bearing 1 which exhibits an improved running-in performance.

1. A sliding bearing having a plurality of annular projections formed to a given height around a sliding surface; characterized in that a surface roughness of the sliding surface, including the surface of the annular projections, is chosen to be equal to or less than one-half the height of the annular projections, and in which the height of the projections is in a range from  2  to  10  μm, and the height of the projections in microns is denoted by H and the roughness in microns is denoted by h, these parameters being related by the following inequality:
     h≦ 0 . 25 H+ 0 . 5 .    
 
     
     
       2. A sliding bearing according to  claim 1  in which the height of the projection in microns is denoted by H and the roughness in microns is denoted by  h , these parameters being related by the following inequality:
   h≦0.25H+0.5.   
     
     
       3. A sliding bearing according to  claim 1  in which the height of the projections is in a range from 2 to 10 μm. 
     
     
       4. A sliding bearing according to  claim 1   having a plurality of annular projections formed to a given height around a sliding surface; characterized in that a surface roughness of the sliding surface, including the surface of the annular projections, is chosen to be equal to or less than one- half the height of the annular projections, and  in which the height of the projections is in a range from 3 to 5 μm. 
     
     
       5. A sliding bearing according to  claim 1  in which the pitch between axially adjacent projections is in a range from 0.1 to 0.4 mm. 
     
     
       6. A sliding bearing according to  claim 4 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm. 
     
     
       7. A sliding bearing according to  claim 1 , in which the height of the projections is in a range from  3  to  5  μm. 
     
     
       8. A sliding bearing according to  claim 7 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm. 
     
     
       9. A sliding bearing having a plurality of annular projections formed to a given height around a sliding surface; characterized in that a surface roughness of the sliding surface, including the surface of the annular projections, is chosen to be equal to or less than one- half the height of the annular projections, and the height of the projections is in a range from  2  to  6  μm.   
     
     
       10. A sliding bearing according to  claim 9 , in which the height of the projection in microns is denoted by H and the roughness in microns is denoted by h, these parameters being related by the following inequality:
     h≦ 0 . 25 H+ 0 . 5 .     
     
     
       11. A sliding bearing according to  claim 9 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm. 
     
     
       12. A sliding bearing according to  claim 10 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm. 
     
     
       13. A sliding bearing having a plurality of annular projections formed to a given height around a sliding surface; characterized in that a surface roughness of the sliding surface, including the surface of the annular projections, is chosen to be equal to or less than one- half the height of the annular projections, and the height of the projections is in a range from  2  to  5  μm.   
     
     
       14. A sliding bearing according to  claim 13 , in which the height of the projection in microns is denoted by H and the roughness in microns is denoted by h, these parameters being related by the following inequality:
     h≦ 0 . 25 H+ 0 . 5 .     
     
     
       15. A sliding bearing according to  claim 13 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm. 
     
     
       16. A sliding bearing according to  claim 14 , in which the pitch between axially adjacent projections is in a range from  0 . 1  to  0 . 4  mm.