Sliding parts
By randomly arranging dimples provided on a sealing face, a sliding characteristic is improved in a wide range of a bearing characteristic number on the sealing face. A pair of sliding parts in which a plurality of dimples is arranged on at least one of sealing faces that relatively slide on each other is characterized in that each of the plurality of dimples is provided independently from the other dimples, and arranged in such a manner that the plurality of dimples having different opening diameters is randomly distributed.
1. A pair of sliding parts having sealing surfaces slidable relative to each other, wherein
at least one of the pair of sliding parts is formed in an annular body, and a plurality of dimples is formed on the sealing surface of the at least one of the pair of sliding parts,
the plurality of dimples includes dimples having a circular, oval, or oblong shape,
the plurality of dimples is arranged randomly,
the plurality of dimples includes dimples arranged to communicate with an inner peripheral side of the sliding parts,
the plurality of dimples further includes dimples arranged to communicate with an outer peripheral side of the sliding parts,
at least one dimple of the dimples communicating with the inner peripheral side of the sliding parts is formed to be narrowed from a center side of the at least one dimple in an inner diameter direction of the sliding parts such that a damming portion is provided between an inside of the at least one dimple and the inner peripheral side of the sliding parts, and
at least one dimple of the dimples communicating with the outer peripheral side of the sliding parts are formed to be narrowed from a center side of each of the at least one dimple in an outer diameter direction of the sliding parts such that a damming portion is provided between an inside of each of the at least one dimple and the outer peripheral side of the sliding parts.
2. The sliding parts according to claim 1 , wherein
the plurality of dimples is arranged in a single dimple formation region extending in a circumferential direction, and
one end portion and the other end portion of the dimple formation region in the circumferential direction are separated from each other by a single seal face formed by the sealing surface.
3. The sliding parts according to claim 2 , wherein
a length of the dimple formation region in the circumferential direction is longer than a length of the seal face in the circumferential direction.
4. The sliding parts according to claim 1 , wherein
the plurality of dimples is arranged in a plurality of dimple formation regions, the plurality of dimple formation regions being arranged in a circumferential direction and separated from each other by a seal face formed by the sealing surface.
5. The sliding parts according to claim 4 , wherein
a length of each of the plurality of dimple formation regions in the circumferential direction is longer than a length of the seal face in the circumferential direction.
6. The sliding parts according to claim 4 , wherein
a dimple arrangement pattern is identical among the plurality of dimple formation regions.
7. The sliding parts according to claim 1 , wherein
each of the damming portions is at least provided at a bottom portion of the corresponding dimple.
8. The sliding parts according to claim 1 , wherein
each of the damming portions is at least provided at a side portion of the corresponding dimple.
9. A pair of sliding parts having sealing surfaces slidable relative to each other, wherein
at least one of the pair of sliding parts is formed in an annular body, and a plurality of dimples is formed on the sealing surface of the at least one of the pair of sliding parts,
the plurality of dimples includes dimples having a circular, oval, or oblong shape,
the plurality of dimples is arranged randomly,
the plurality of dimples includes dimples arranged to communicate with an inner peripheral side of the sliding parts or dimples arranged to communicate with an outer peripheral side of the sliding parts, and
at least one dimple of the dimples communicating with the inner peripheral side or the outer peripheral side of the sliding parts is formed to be narrowed from a center side of the at least one dimple in an inner diameter direction or an outer diameter direction of the sliding parts such that a damming portion is provided between an inside of the at least one dimple and the inner peripheral side or the outer peripheral side of the sliding parts.
10. The sliding parts according to claim 9 , wherein
the plurality of dimples is arranged in a single dimple formation region extending in a circumferential direction, and
one end portion and the other end portion of the dimple formation region in the circumferential direction are separated from each other by a single seal face formed by the sealing surface.
11. The sliding parts according to claim 10 , wherein
a length of the dimple formation region in the circumferential direction is longer than a length of the seal face in the circumferential direction.
12. The sliding parts according to claim 9 , wherein
the plurality of dimples is arranged in a plurality of dimple formation regions, the plurality of dimple formation regions being arranged in a circumferential direction and separated from each other by a seal face formed by the sealing surface.
13. The sliding parts according to claim 12 , wherein
a length of each of the plurality of dimple formation regions in the circumferential direction is longer than a length of the seal face in the circumferential direction.
14. The sliding parts according to claim 12 , wherein
a dimple arrangement pattern is the same among the plurality of dimple formation regions.
15. The sliding parts according to claim 9 , wherein
the damming portion is at least provided at a bottom portion of the at least one dimple.
16. The sliding parts according to claim 9 , wherein
the damming portion is at least provided at a side portion of the at least one dimple.
17. The sliding parts according to claim 9 , wherein
at least one dimple of the dimples communicating with the inner peripheral side or the outer peripheral side of the sliding parts is formed to be narrowed from a center side of the at least one dimple in an inner diameter direction or an outer diameter direction of the sliding parts such that a damming portion is provided between an inside of the at least one dimple and the inner peripheral side or the outer peripheral side of the sliding parts.
18. The sliding parts according to claim 17 , wherein
the damming portion is at least provided at a bottom portion of the at least one dimple.
19. The sliding parts according to claim 17 , wherein
the damming portion is at least provided at a side portion of the at least one dimple.
20. A pair of sliding parts having sealing surfaces slidable relative to each other, wherein
at least one of the pair of sliding parts is formed in an annular body, and a plurality of dimples is formed on the sealing surface of the at least one of the pair of sliding parts,
the plurality of dimples includes dimples having a circular, oval, or oblong shape,
the plurality of dimples is arranged randomly,
the plurality of dimples includes dimples arranged to communicate with an inner peripheral side of the sliding parts or dimples arranged to communicate with an outer peripheral side of the sliding parts,
the plurality of dimples is arranged in a single dimple formation region extending in a circumferential direction, and
one end portion and the other end portion of the dimple formation region in the circumferential direction are separated from each other by a single seal face formed by the sealing surface.
21. The sliding parts according to claim 20 , wherein
a length of the dimple formation region in the circumferential direction is longer than a length of the seal face in the circumferential direction.
22. The sliding parts according to claim 20 , wherein
at least one dimple of the dimples communicating with the inner peripheral side or the outer peripheral side of the sliding parts is formed to be narrowed from a center side of the at least one dimple in an inner diameter direction or an outer diameter direction of the sliding parts such that a damming portion is provided between an inside of the at least one dimple and the inner peripheral side or the outer peripheral side of the sliding parts.
23. The sliding parts according to claim 22 , wherein
the damming portion is at least provided at a bottom portion of the at least one dimple.
24. The sliding parts according to claim 22 , wherein
the damming portion is at least provided at a side portion of the at least one dimple.
25. A pair of sliding parts having sealing surfaces slidable relative to each other, wherein
at least one of the pair of sliding parts is formed in an annular body, and a plurality of dimples is formed on the sealing surface of the at least one of the pair of sliding parts,
the plurality of dimples includes dimples having a circular, oval, or oblong shape,
the plurality of dimples is arranged randomly,
the plurality of dimples includes dimples arranged to communicate with an inner peripheral side of the sliding parts or dimples arranged to communicate with an outer peripheral side of the sliding parts, and
the plurality of dimples is arranged in a plurality of dimple formation regions, the plurality of dimple formation regions being arranged in a circumferential direction and separated from each other by a seal face formed by the sealing surface.
26. The sliding parts according to claim 25 , wherein
a length of each of the plurality of dimple formation regions in the circumferential direction is longer than a length of the seal face in the circumferential direction.
27. The sliding parts according to claim 25 , wherein
a dimple arrangement pattern is the same among the plurality of dimple formation regions.