Sliding component

Abstract

In an exemplary embodiment of a sliding component, a sliding face S is provided with a first fluid-side negative pressure generation mechanism 12 including a first negative pressure generation groove 13 , and is provided with a second fluid-side negative pressure generation mechanism 14 including second negative pressure generation grooves 15 located on the second-fluid side of the first fluid-side negative pressure generation mechanism 12 , and is further provided with a dynamic pressure generation mechanism 10 including dynamic pressure generation grooves 11 on at least one of the first-fluid side and the second-fluid side of the first fluid-side negative pressure generation mechanism 12 and the second fluid-side negative pressure generation mechanism 14 , and the first negative pressure generation groove 13 is isolated from the second-fluid side by a land R, and the second negative pressure generation grooves 15 are isolated from the first-fluid side by a land R.

The invention claimed is: 
     
         1 . A sliding structure comprising:
 a pair of sliding parts sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with:   a first fluid-side negative pressure generation mechanism,   a second fluid-side negative pressure generation mechanism located on the second-fluid side of the first fluid-side negative pressure generation mechanism,   a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on the first-fluid side of the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism,   a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other,   a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other,   a first annular circumferential groove provided in and running annularly through the first land part, and   a second annular circumferential groove provided in and running annularly through the second land part,   wherein:   the first fluid-side negative pressure generation mechanism is formed by a first spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side communicates with the second annular circumferential groove, and an end of each groove on the second-fluid side is isolated from the first annular circumferential groove by the first land part,   the second fluid-side negative pressure generation mechanism is formed by a second spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side communicates with the first annular circumferential groove, and an end of each groove on the second-fluid side communicates with the second-fluid side, and   the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
         2 . The sliding structure according to  claim 1 , wherein each of the first and second annular circumferential grooves has a groove depth set deeper than a groove depth of the grooves of the dynamic pressure generation mechanism, the grooves of the first fluid-side negative pressure generation mechanism, and the grooves of the second fluid-side negative pressure generation mechanism. 
     
     
         3 . A sliding structure comprising:
 a pair of sliding parts sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with:   a first fluid-side negative pressure generation mechanism,   a second fluid-side negative pressure generation mechanism located on the second-fluid side of the first fluid-side negative pressure generation mechanism,   a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on the first-fluid side of the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism,   a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other,   a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other,   a first annular circumferential groove provided in and running annularly through the first land part, and   a second annular circumferential groove provided in and running annularly through the second land part,   wherein:   the first fluid-side negative pressure generation mechanism is formed by a first spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side communicates with the second annular circumferential groove, and an end of each groove on the second-fluid side is isolated from the first annular circumferential groove by the first land part,   the second fluid-side negative pressure generation mechanism is formed by a second spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the first annular circumferential groove by the first land part, and an end of each groove on the second-fluid side communicates with the second-fluid side, and   the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
         4 . The sliding structure according to  claim 3 , wherein each of the first and second annular circumferential grooves has a groove depth set deeper than a groove depth of the grooves of the dynamic pressure generation mechanism, the grooves of the first fluid-side negative pressure generation mechanism, and the grooves of the second fluid-side negative pressure generation mechanism. 
     
     
         5 . A sliding structure comprising:
 a pair of sliding parts sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with:   a first fluid-side negative pressure generation mechanism,   a second fluid-side negative pressure generation mechanism located on the second-fluid side of the first fluid-side negative pressure generation mechanism,   a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on the first-fluid side of the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism,   a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other,   a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other,   a first annular circumferential groove provided in and running annularly through the first land part, and   a second annular circumferential groove provided in and running annularly through the second land part,   wherein:   the first fluid-side negative pressure generation mechanism is formed by a first spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the second annular circumferential groove by the second land part, and an end of each groove on the second-fluid side is isolated from the first annular circumferential groove by the first land part,   the second fluid-side negative pressure generation mechanism is formed by a second spiral mechanism constituted by grooves, wherein an end of each groove on the first-fluid side is isolated from the first annular circumferential groove by the first land part, and an end of each groove on the second-fluid side communicates with the second-fluid side, and   the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
         6 . The sliding structure according to  claim 5 , wherein each of the first and second annular circumferential grooves has a groove depth set deeper than a groove depth of the grooves of the dynamic pressure generation mechanism, the grooves of the first fluid-side negative pressure generation mechanism, and the grooves of the second fluid-side negative pressure generation mechanism. 
     
     
       7. A sliding structure comprising:
 a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove which has a dead end on an uppermost stream side of the first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove which has a dead end on an uppermost stream side of the second negative pressure generation groove and is located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided with a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,   a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other, a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly through the first land part, and a second annular circumferential groove provided in and running annularly through the second land part, wherein   the first negative pressure generation groove is isolated from the second fluid side by the first land part, and the second negative pressure generation groove is isolated from the first-fluid side by the second land part, and wherein   a downstream side end of each groove on the first- fluid side communicates with the second annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
       8. The sliding structure according to  claim 7 , wherein
 the first negative pressure generation groove is a spiral groove.   
     
     
       9. The sliding structure according to  claim 7 , wherein
 the first negative pressure generation groove has a reversed Rayleigh step.   
     
     
       10. The sliding structure according to  claim 7 , wherein
 the second negative pressure generation groove is a spiral groove.   
     
     
       11. The sliding structure according to  claim 7 , wherein
 the second negative pressure generation groove has a reversed Rayleigh step.   
     
     
       12. The sliding structure according to  claim 7 , wherein
 each of the grooves of the dynamic pressure generation mechanism is a spiral groove.   
     
     
       13. The sliding structure according to  claim 7 , wherein
 each of the grooves of the dynamic pressure generation mechanism has a Rayleigh step.   
     
     
       14. The sliding structure according to  claim 7 , wherein
 the sliding face is further provided with an annular circumferential groove disposed between the first negative pressure generation groove and the second negative pressure generation groove.   
     
     
       15. The sliding structure according to  claim 7 , wherein
 the sliding face is further provided with a first annular circumferential groove disposed between the first negative pressure generation groove and the second negative pressure generation groove, and   the sliding face is further provided with a second annular circumferential groove disposed between the dynamic pressure generation groove and one of the first negative pressure generation groove and the second negative pressure generation groove.   
     
     
       16. The sliding structure according to  claim 7 , wherein
 the first negative pressure generation groove has another dead end on a downmost stream side of the first negative pressure generation groove,   the second negative pressure generation groove has another dead end on a downmost stream side of the second negative pressure generation groove, and   each of the dynamic pressure generation grooves has another dead end on an uppermost stream side of each of the dynamic pressure generation grooves.   
     
     
       17. A sliding structure comprising:
 a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove which is located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided with a dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,   a land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly, and a second annular circumferential groove provided in and running annularly through the land part, wherein   the first negative pressure generation groove and the second negative pressure generation groove are isolated from the first-fluid side by the land part, and wherein   an upstream side end of each groove on the first- fluid side communicates with the first annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
       18. The sliding structure according to  claim 17 , wherein
 the first negative pressure generation groove is a spiral groove.   
     
     
       19. The sliding structure according to  claim 17 , wherein
 the first negative pressure generation groove has a reversed Rayleigh step.   
     
     
       20. The sliding structure according to  claim 17 , wherein
 the second negative pressure generation groove is a spiral groove.   
     
     
       21. The sliding structure according to  claim 17 , wherein
 the second negative pressure generation groove has a reversed Rayleigh step.   
     
     
       22. The sliding structure according to  claim 17 , wherein
 each of the grooves of the dynamic pressure generation mechanism is a spiral groove.   
     
     
       23. The sliding structure according to  claim 17 , wherein
 each of the grooves of the dynamic pressure generation mechanism has a Rayleigh step.   
     
     
       24. The sliding structure according to  claim 17 , wherein
 the sliding face is further provided with an annular circumferential groove disposed between the first negative pressure generation groove and the second negative pressure generation groove.   
     
     
       25. The sliding structure according to  claim 17 , wherein
 the sliding face is further provided with a first annular circumferential groove disposed between the first negative pressure generation groove and the second negative pressure generation groove, and   the sliding face is further provided with a second annular circumferential groove disposed between the dynamic pressure generation groove and one of the first negative pressure generation groove and the second negative pressure generation groove.   
     
     
       26. The sliding structure according to  claim 17 , wherein
 the first negative pressure generation groove has another dead end on a downmost stream side of the first negative pressure generation groove,   the second negative pressure generation groove has another a dead end on a downmost stream side of the second negative pressure generation groove, and   each of the dynamic pressure generation grooves has another dead end on an uppermost stream side of each of the dynamic pressure generation grooves.   
     
     
       27. A sliding structure comprising:
 a pair of sliding parts configured for sliding relative to each other, the pair of sliding parts each having a sliding face, on both sides of which a first fluid and a second fluid of different kinds are present,   wherein the sliding face of at least one of the sliding parts is provided with a first fluid-side negative pressure generation mechanism comprising a first negative pressure generation groove which has a dead end on an uppermost stream side of the first negative pressure generation groove, and is provided with a second fluid-side negative pressure generation mechanism comprising a second negative pressure generation groove located on the second-fluid side of the first fluid-side negative pressure generation mechanism, and is further provided witha dynamic pressure generation mechanism comprising dynamic pressure generation grooves on at least one of the first-fluid side of the first fluid-side negative pressure generation mechanism and the second-fluid side of the second fluid-side negative pressure generation mechanism, each of the dynamic pressure generation grooves has a dead end on a downmost stream side of each of the dynamic pressure generation grooves and communicates with one of the first-fluid side and the second fluid side on a side opposite to the dead end of each of the dynamic pressure generation grooves,   the second negative pressure generation groove has an uppermost stream end communicating with the annular circumferential groove,   a first land part by which the first fluid-side negative pressure generation mechanism and the second fluid-side negative pressure generation mechanism are isolated from each other, a second land part by which the first fluid-side negative pressure generation mechanism and the dynamic pressure generation mechanism are isolated from each other, a first annular circumferential groove provided in and running annularly through the first land part, and a second annular circumferential groove provided in and running annularly through the second land part,   the first negative pressure generation groove is isolated from the second fluid side by the first land part, and the second negative pressure generation groove is isolated from the first-fluid side by the first land part, and wherein   a downstream side end of each groove on the first-fluid side communicates with the second annular circumferential groove, and a downstream side end of each groove on the second-fluid side communicates with the second-fluid side, and the dynamic pressure generation mechanism is constituted by grooves each formed by a Rayleigh step, wherein each groove having the Rayleigh step communicates with the first-fluid side and is isolated from the second-fluid side by the second land part.   
     
     
       28. The sliding structure according to  claim 27 , wherein
 the first negative pressure generation groove is a spiral groove.   
     
     
       29. The sliding structure according to  claim 27 , wherein
 the first negative pressure generation groove has a reversed Rayleigh step.   
     
     
       30. The sliding structure according to  claim 27 , wherein
 the second negative pressure generation groove is a spiral groove.   
     
     
       31. The sliding structure according to  claim 27 , wherein
 the second negative pressure generation groove has a reversed Rayleigh step.   
     
     
       32. The sliding structure according to  claim 27 , wherein
 each of the grooves of the dynamic pressure generation mechanism is a spiral groove.   
     
     
       33. The sliding structure according to  claim 27 , wherein
 each of the grooves of the dynamic pressure generation mechanism has a Rayleigh step.   
     
     
       34. The sliding structure according to  claim 27 , wherein
 the sliding face is further provided with another annular circumferential groove disposed between the dynamic pressure generation groove and the first negative pressure generation groove.   
     
     
       35. The sliding structure according to  claim 27 , wherein
 the annular circumferential groove has a depth larger than a depth of the second negative pressure generation groove.