Sensory fitting for monitoring bearing performance

• US 6,271,761 B1
• Filed: 07/15/1998
• Issued: 08/07/2001
• Est. Priority Date: 12/15/1995
• Status: Expired due to Fees

• Current Assignee: Scientific Operating Systems, Inc.
• Original Assignee: Scientific Operating Systems, Inc.
• Inventors: Bernard, Thomas R., Smith, Charles C.
• Primary Examiner(s): MULLEN, THOMAS J
• Application Number:
  US09/091,326
• Time in Patent Office: 1,119 Days
• Field of Search: 340/682, 340/683, 735/93, 736/58, 736/60, 184/108, 184/105.2, 184/105.3, 184/6.4, 116/101, 116/216, 246/169.A, 374/208, 702/127, 702/130
• US Class Current: 340/682
• CPC Class Codes: F16C 19/525 related to temperature and heat, e.g. insulation
• CPC Class Codes: F16C 19/527 related to vibration and noise
• CPC Class Codes: F16C 2380/26 Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators in general H02K
• CPC Class Codes: F16C 33/6622 Details of supply and/or removal of the grease, e.g. purging grease
• CPC Class Codes: F16C 35/047 with a base plate substantially parallel to the axis of rotation, e.g. horizontally mounted pillow blocks
• CPC Class Codes: G01M 13/045 Acoustic or vibration analysis

Abstract

Described is a device (10) for monitoring bearing performance in apparatus having an aperture sized and configured to receive a grease fitting. The device includes temperature sensing components (34) or vibration sensing components (36), or both, to enable detection of impending bearing failure, and is adapted to either replace or supplement conventional grease fittings (28). The device is configured so as to cooperate with bearings housings of widely divergent dimensions, and in each case to permit adjustment of the device, including the sensing components thereof, to place it in very close proximity to the bearing.

Claims

1. A device for monitoring bearing performance in apparatus having at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said bearing, which device comprises a sensing fitting sized, threaded and configured to be threadably received in said aperture, said sensing fitting including a connecting end which defines a grease path and which is sized and configured to be fixedly yet detachably received by said aperture so that, when installed in said aperture, said connecting end is proximate to said bearing, and temperature sensing means to enable detection of impending bearing failure, a portion of said temperature sensing means extending into and along the length of said connecting end.

2. A device according to claim 1 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said apparatus.

3. A device according to claim 2 wherein said detector is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

4. A device according to claim 1 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said apparatus.

5. A device according to claim 4 wherein said element is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

6. A device according to claim 1 wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

7. A device according to claim 1 wherein said sensing fitting further includes a receiving end and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

8. A device for monitoring bearing performance in apparatus having at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said bearing, which device comprises a sensing fitting sized, threaded and configured to be threadably received in said aperture, said sensing fitting including vibration sensing means to enable detection of impending bearing failure, and said sensing fitting being threadably adjustably extendable into said apparatus to permit control of the proximity of said sensing fitting and said sensing means to said bearing, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path, and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

9. A device according to claim 8 wherein said vibration sensing means comprise a vibration sensor capable of detecting vibration within an x, y and/or z plane.

10. A device according to claim 9 wherein said sensor is adapted, upon detecting vibration within an x, y and/or z plane, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

11. A device according to claim 8 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

12. A device according to claim 8 further comprising temperature sensing means to enable detection of impending bearing failure.

13. A device according to claim 12 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

14. A device according to claim 12 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said apparatus.

15. A device according to claim 14 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

16. A device according to claim 14 wherein said detector is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

17. A device according to claim 14 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane.

18. A device according to claim 17, wherein said sensor is adapted, upon detecting vibration within an x, y and/or z plane, to send a signal to a sensor signal receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

19. A device according to claim 18, wherein said detector is adapted to send a signal to a detector signal receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

20. A device according to claim 19 wherein said detector and said sensor are adapted to constantly send their respective signal, and said respective receivers are adapted to also trend data produced from conversion of the respective signals.

21. A device according to claim 19 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

22. A device according to claim 12 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said apparatus.

23. A device according to claim 22 wherein said element is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

24. A device according to claim 23 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane.

25. A device according to claim 24, wherein said sensor is adapted, upon detecting vibration within an x, y and/or z plane, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

26. A device according to claim 25 wherein said element and said sensor are adapted to constantly send their respective signal, and said respective receivers are adapted to also trend data produced from conversion of the respective signals.

27. A device according to claim 25 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

28. A device according to claim 12 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane.

29. A device according to claim 28, wherein said sensor is adapted, upon detecting vibration within an x, y and/or z plane, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

30. A device according to claim 29 wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

31. The device according to any of claims 20, 21, 26, or 27 taken individually, wherein, when said device is installed, the distance between a portion of said sensing fitting and said bearing is in the range of about 0 to about 3 mm.

32. The device according to any of claims 7, 11, 13, 21 or 27 taken individually, wherein said connecting end is substantially uniformly cylindrical and is externally threaded.

33. In apparatus which comprises a housing having a rotary shaft, at least one bearing in which said shaft is rotated, and at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said housing, the improvement wherein a sensing fitting sized, threaded and configured to be threadably received in said aperture is threadably received in said aperture, said sensing fitting including a connecting end which defines a grease path and which is sized and congifured to be fixedly yet detachably received by said aperture so that, when installed in said aperture, said connecting end is proximate to said bearing, and temperture sensing means to enable detection of impleding bearing failure, a portion of said temperture sensing meanst extending into and along the length of said connecting end.

34. Apparatus according to claim 33 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

35. Apparatus according to claim 33 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting further includes a receiving end, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

36. Apparatus according to claim 33 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

37. Apparatus according to claim 33 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting further includes a receiving end, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

38. In apparatus which comprises a housing having a rotary shaft, at least one bearing in which said shaft is rotated, and at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said housing, the improvement wherein a sensing fitting sized, threaded and configured to be threadably received in said aperture is threadably received in said aperture, said sensing fitting including vibration sensing means to enable detection of impending bearing failure, and said sensing fitting being threadably adjustably extendable into said apparatus to permit control of the proximity of said sensing fitting and said sensing means to said bearing, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure, thereby preventing lubricant from leaking out from said apparatus and through said nipple.

39. Apparatus according to claim 38 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level.

40. Apparatus according to claim 38 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level, and wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture.

41. Apparatus according to claim 38 wherein said sensing fitting also includes temperature sensing means to enable detection of impending bearing failure.

42. Apparatus according to claim 41 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level.

43. Apparatus according to claim 42 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level.

44. Apparatus according to claim 42 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level, and wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture.

45. Apparatus according to claim 41 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said housing and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said housing and/or producing an audible or visual alarm if the temperature reaches a preselected level.

46. Apparatus according to claim 45 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level.

47. Apparatus according to claim 45 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level, and wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture.

48. Apparatus according to claim 41 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level.

49. Apparatus according to claim 41 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said housing and/or producing an audible or visual alarm if the vibration reaches a preselected level, and wherein said sensing fitting has a connecting end and a receiving end, said connecting end being sized and configured to be fixedly yet detachably received by said aperture.

50. A method of monitoring bearing performance in apparatus having at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said bearing, said method comprising placing in said aperture a sensing fitting sized, threaded and configured to be threadably received in said aperture, said sensing fitting including a connecting end which defines a grease path and which is sized and configured to be fixedly yet detachably received by said aperture so that, when installed in said aperture, said connecting end is proximate to said bearing, and detecting a change in bearing temperature by providing temperature sensing means to enable detection of impending bearing failure, a portion of said temperature sensing means extending into and along the length of said connecting end.

51. A method according to claim 50 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

52. A method according to claim 50 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting further includes a receiving end, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

53. A method according to claim 50 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple, a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

54. A method according to claim 50 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level, and wherein said sensing fitting further includes a receiving end, and wherein said sensing fitting has an axial bore along its longitudinal axis for providing a grease path, the portion of said bore proximate to said receiving end being sized and configured to fixedly yet detachably receive a grease fitting.

55. A method of monitoring bearing performance in apparatus having at least one threaded aperture sized and disposed to connectably receive a grease fitting for providing lubricant to said bearing, said method comprising placing in said aperture a sensing fitting sized, threaded and configured to be threadably received in said aperture, said sensing fitting including a connecting end which is sized and configured to be fixedly yet detachably received by said aperture so that, when installed in said aperture, said connecting end is proximate to said bearing, and detecting a change in the amount of bearing vibration by providing vibration sensing means to enable detection of impending bearing failure, said sensing fitting being threadably adjustably extendable into said apparatus to permit control of the proximity of said sensing fitting and said sensing means to said bearing, and wherein said sensing fitting is in addition a grease fitting for providing lubricant to said bearing, said sensing fitting including a grease inlet nipple. a grease path and a closure, which closure remains closed at all times when the internal pressure applied to said closure exceeds the external pressure applied to said closure, said closure thereby preventing lubricant from leaking out from said apparatus and through said nipple.

56. A method according to claim 55 wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

57. A method according to claim 55 wherein said sensing fitting also includes temperature sensing means to enable detection of impending bearing failure.

58. A method according to claim 57 wherein said temperature sensing means comprises a thermistor temperature detector which undergoes a change in resistance in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

59. A method according to claim 58, wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

60. A method according to claim 57 wherein said temperature sensing means comprises a thermocouple sensing element which undergoes a change in current in response to a change in temperature within said apparatus and is adapted to send a signal to a receiver capable of converting said signal into an audible or visual record of the temperature within said apparatus and/or producing an audible or visual alarm if the temperature reaches a preselected level.

61. A method according to claim 60, wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.

62. A method according to claim 57, wherein said vibration sensing means comprises a vibration sensor capable of detecting vibration within an x, y and/or z plane and adapted, upon detecting such vibration, to send a signal to a receiver capable of converting said signal into an audible or visual record of the vibration within said apparatus and/or producing an audible or visual alarm if the vibration reaches a preselected level.