SLIDING COMPONENT

• US 20130209011A1
• Filed: 10/05/2011
• Published: 08/15/2013
• Est. Priority Date: 10/06/2010
• Status: Active Grant

• Current Assignee: Eagle Industry Company Limited
• Original Assignee: Eagle Industry Company Limited
• Inventors: Tokunaga, Yuichiro
• Granted Patent: US 8,814,433 B2
• Time in Patent Office: Days
• US Class Current: 384/123
• CPC Class Codes: F01D 25/168 for axial load mainly
• CPC Class Codes: F01D 25/186 for sliding contact bearing
• CPC Class Codes: F16C 17/045 with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
• CPC Class Codes: F16C 17/047 with fixed wedges to generate hydrodynamic pressure
• CPC Class Codes: F16C 32/0633 the liquid being retained in a gap
• CPC Class Codes: F16C 33/74 of sliding-contact bearings
• CPC Class Codes: F16C 33/741 by means of a fluid
• CPC Class Codes: F16J 15/3412 with cavities F16J15/3424 takes precedence
• CPC Class Codes: F16J 15/342 with means for feeding fluid directly to the face
• CPC Class Codes: F16J 15/40 by means of fluid

Abstract

A positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, and a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side. The positive pressure generating groove and negative pressure generating groove are communicated with a high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

Claims

1. A sliding component characterized in that a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, the negative pressure generating groove being communicated with a high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

24. The sliding component according to claim 1, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

2. A sliding component characterized in that a positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, and a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side, said positive pressure generating groove and negative pressure generating groove being communicated with a high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

3. A sliding component according to claim 2, characterized in that said negative pressure generating groove is provided to a low-pressure side of the other sliding surface.

7. The sliding component according to claim 2, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, and the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, said Rayleigh step mechanism and reverse Rayleigh step mechanism being communicated with the high-pressure fluid side.

8. The sliding component according to claim 7, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts being communicated with the high-pressure fluid side via a shared communication.

9. The sliding component according to claim 7, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction, an upstream end of a groove part of one of the Rayleigh step mechanisms and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being individually communicated with the high-pressure fluid side.

10. The sliding component according to claim 7, characterized in that a plurality of reverse Rayleigh step mechanisms are provided in a radial direction.

23. The sliding component according to claim 3, characterized in that the width of the internal-peripheral-side seal surface can be varied.

41. The sliding component according to claim 2, characterized in that the width of the internal-peripheral-side seal surface can be varied.

42. The sliding component according to claim 2, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

4. A sliding component characterized in that an external peripheral side of a pair of sliding components is a high-pressure fluid side and an internal peripheral side is a low-pressure fluid side, a positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of a sliding surface of a stationary-side sliding component, and a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side of a sliding surface of a rotating-side sliding component, said positive pressure generating groove and negative pressure generating groove being communicated with the high-pressure fluid side and separated from the low-pressure fluid side by an internal-peripheral-side seal surface.

25. The sliding component according to claim 4, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, and the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, said Rayleigh step mechanism and reverse Rayleigh step mechanism being communicated with the high-pressure fluid side.

26. The sliding component according to claim 25, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts being communicated with the high-pressure fluid side via a shared communication.

27. The sliding component according to claim 25, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction, an upstream end of a groove part of one of the Rayleigh step mechanisms and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being individually communicated with the high-pressure fluid side.

28. The sliding component according to claim 25, characterized in that a plurality of reverse Rayleigh step mechanisms are provided in a radial direction.

43. The sliding component according to claim 4, characterized in that the width of the internal-peripheral-side seal surface can be varied.

44. The sliding component according to claim 4, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

5. A sliding component characterized in that a pair of sliding components comprise annular bodies, an external peripheral side of said annular bodies is a high-pressure fluid side and an internal peripheral side is a low-pressure fluid side;

in a sliding surface on one side of the annular body, a positive pressure generating mechanism comprising a positive pressure generating groove is provided to the external peripheral side, and a negative pressure generating mechanism comprising a negative pressure generating groove is provided to the internal peripheral side;

said positive pressure generating groove and negative pressure generating groove being communicated with the high-pressure fluid side, and separated from the low-pressure fluid side by an internal-peripheral-side seal surface.

6. The sliding component according to claim 5, characterized in that said positive pressure generating mechanism comprising a positive pressure generating groove is provided to the external peripheral side on a stationary-side sliding surface of the annular body, and said negative pressure generating mechanism comprising a negative pressure generating groove is provided to the internal peripheral side on a rotating-side sliding surface of the annular body.

29. The sliding component according to claim 5, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, and the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, said Rayleigh step mechanism and reverse Rayleigh step mechanism being communicated with the high-pressure fluid side.

30. The sliding component according to claim 29, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts being communicated with the high-pressure fluid side via a shared communication.

31. The sliding component according to claim 29, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction, an upstream end of a groove part of one of the Rayleigh step mechanisms and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being individually communicated with the high-pressure fluid side.

32. The sliding component according to claim 29, characterized in that a plurality of reverse Rayleigh step mechanisms are provided in a radial direction.

45. The sliding component according to claim 5, characterized in that the width of the internal-peripheral-side seal surface can be varied.

46. The sliding component according to claim 5, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

11. A sliding component characterized in that a positive pressure generating mechanism comprising a spiral groove or a dimple directly communicated with a high-pressure fluid side is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, and a negative pressure generating mechanism comprising a reverse Rayleigh step mechanism is provided to a low-pressure side, said reverse Rayleigh step mechanism being communicated with a high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

47. The sliding component according to claim 11, characterized in that the width of the internal-peripheral-side seal surface can be varied.

48. The sliding component according to claim 11, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

12. A sliding component characterized in that a positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side, and a pressure release groove is provided between said positive pressure generating groove and negative pressure generating groove, said positive pressure generating groove, pressure release groove, and negative pressure generating groove being communicated with a high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

13. A sliding component according to claim 12, characterized in that said pressure release groove is provided to each of said one and other sliding surfaces so as to be positioned between said positive pressure generating groove and negative pressure generating groove.

17. The sliding component according to claim 12, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, and the pressure release groove is formed from a circular groove, said Rayleigh step mechanism, reverse Rayleigh step mechanism, and pressure release groove all being communicated with the high-pressure fluid side.

18. The sliding component according to claim 17, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction to either side of the pressure release groove so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts and the pressure release groove being communicated with the high-pressure fluid side via a shared communication.

19. The sliding component according to claim 17, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction on either side of the pressure release groove, an upstream end of a groove part of one Rayleigh step mechanism and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts and the pressure release groove are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being communicated with the high-pressure fluid side via individual communication.

20. The sliding component according to claim 17, characterized in that a plurality of reverse Rayleigh step mechanisms are provided in a radial direction.

49. The sliding component according to claim 12, characterized in that the width of the internal-peripheral-side seal surface can be varied.

50. The sliding component according to claim 12, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

14. A sliding component characterized in that an external peripheral side of a pair of sliding components is a high-pressure fluid side, an internal peripheral side is a low-pressure fluid side, a positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of a sliding surface of a stationary-side sliding component, a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side of a sliding surface of a rotating-side sliding component, and a pressure release groove is provided to each of said stationary-side and rotating-side sliding surfaces so as to be positioned between said positive pressure generating groove and negative pressure generating groove, said positive pressure generating groove, pressure release grooves, and negative pressure generating groove being communicated with the high-pressure fluid side and separated from the low-pressure fluid side by a seal surface.

33. The sliding component according to claim 14, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, and the pressure release groove is formed from a circular groove, said Rayleigh step mechanism, reverse Rayleigh step mechanism, and pressure release groove all being communicated with the high-pressure fluid side.

34. The sliding component according to claim 33, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction to either side of the pressure release groove so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts and the pressure release groove being communicated with the high-pressure fluid side via a shared communication.

35. The sliding component according to claim 33, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction on either side of the pressure release groove, an upstream end of a groove part of one Rayleigh step mechanism and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts and the pressure release groove are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being communicated with the high-pressure fluid side via individual communication.

36. The sliding component according to claim 33, characterized in that a plurality of reverse Rayleigh step mechanisms are provided in a radial direction.

51. The sliding component according to claim 14, characterized in that the width of the internal-peripheral-side seal surface can be varied.

52. The sliding component according to claim 14, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

15. A sliding component characterized in that a pair of sliding components comprise annular bodies, an external peripheral side of the annular bodies is a high-pressure fluid side and an internal peripheral side is a low-pressure fluid side, a positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side of a sliding surface on one side of the annular body, a negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side, and a pressure release groove is provided between said positive pressure generating groove and negative pressure generating groove, said positive pressure generating groove, pressure release groove, and negative pressure generating groove being communicated with the high-pressure fluid side and separated from the low-pressure fluid side by a seal surface.

16. The sliding component according to claim 15, characterized in that said positive pressure generating mechanism comprising a positive pressure generating groove is provided to a high-pressure side in a stationary-side sliding surface of the annular body, said negative pressure generating mechanism comprising a negative pressure generating groove is provided to a low-pressure side of a rotating-side sliding surface of the annular body, and a pressure release groove is provided to said stationary-side and rotating-side sliding surfaces so as to be positioned between said positive pressure generating groove and negative pressure generating groove, said positive pressure generating groove, pressure release grooves, and negative pressure generating groove being communicated with the high-pressure fluid side and separated from the low-pressure fluid side by a seal surface.

37. The sliding component according to claim 15, characterized in that the external-peripheral-side positive pressure generating mechanism is formed from a Rayleigh step mechanism, the internal-peripheral-side negative pressure generating mechanism is formed from a reverse Rayleigh step mechanism, and the pressure release groove is formed from a circular groove, said Rayleigh step mechanism, reverse Rayleigh step mechanism, and pressure release groove all being communicated with the high-pressure fluid side.

38. The sliding component according to claim 37, characterized in that pluralities of Rayleigh step mechanisms and reverse Rayleigh step mechanisms are provided in parallel in a circumferential direction to either side of the pressure release groove so as to constitute pairs, and an upstream end of a groove part of an n^th Rayleigh step mechanism and a downstream end of a groove part of an n−

1^th reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction as seen from the upstream side, both groove parts and the pressure release groove being communicated with the high-pressure fluid side via a shared communication.

39. The sliding component according to claim 37, characterized in that a plurality of Rayleigh step mechanisms and one reverse Rayleigh step mechanism are provided in parallel in a circumferential direction on either side of the pressure release groove, an upstream end of a groove part of one Rayleigh step mechanism and a downstream end of a groove part of the reverse Rayleigh step mechanism are formed so as to substantially coincide in a position in the circumferential direction, and both groove parts and the pressure release groove are communicated with the high-pressure fluid side via a shared communication, the upstream ends of the groove parts of the remaining Rayleigh step mechanisms being communicated with the high-pressure fluid side via individual communication.

40. The sliding component according to claim 37, characterized in that a plurality of reverse Rayleigh step mechanism are provided in radial direction.

53. The sliding component according to claim 15, characterized in that the width of the internal-peripheral-side seal surface can be varied.

54. The sliding component according to claim 15, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

21. A sliding component characterized in that a positive pressure generating mechanism comprising a spiral groove or a dimple directly communicated with a high-pressure fluid side is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, a negative pressure generating mechanism comprising a reverse Rayleigh step mechanism is provided to a low-pressure side, and a pressure release groove is provided between said spiral groove or dimple and the reverse Rayleigh step mechanism, the pressure release groove and reverse Rayleigh step mechanism being communicated with the high-pressure fluid side and separated from a low-pressure fluid side by a seal surface.

55. The sliding component according to claim 21, characterized in that the width of the internal-peripheral-side seal surface can be varied.

56. The sliding component according to claim 21, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.

22. A sliding component characterized in that a positive pressure generating mechanism comprising a spiral groove or a dimple directly communicated with a high-pressure fluid side is provided to a high-pressure side of one of two sliding surfaces that slide relative to each other in a pair of sliding components, a negative pressure generating mechanism comprising a reverse spiral groove is provided to a low-pressure side, and a pressure release groove is provided between said high-pressure-side spiral groove or dimple and the low-pressure-side reverse spiral groove, said low-pressure-side reverse spiral groove being communicated with the high-pressure fluid side via the pressure release groove and separated from the low-pressure fluid side by a seal surface.

57. The sliding component according to claim 22, characterized in that the width of the internal-peripheral-side seal surface can be varied.

58. The sliding component according to claim 22, characterized in that a radial-direction groove is shaped so as to be slanted from the internal peripheral side communicated with the negative pressure generating mechanism to the external peripheral side in the rotational direction of the counterpart sliding surface.