Bearing housing with embedded temperature measurement device

• US 5,433,525 A
• Filed: 08/13/1993
• Issued: 07/18/1995
• Est. Priority Date: 08/13/1993
• Status: Expired due to Term

• Current Assignee: Reliance Electric Technologies LLC (ABB Limited)
• Original Assignee: Reliance Electric Industrial Company
• Inventors: El-Ibiary, Yehia
• Primary Examiner(s): GUTIERREZ, DIEGO F
• Application Number:
  US08/106,061
• Time in Patent Office: 704 Days
• Field of Search: 374/141, 374/153, 374/179, 384/448, 384/624
• US Class Current: 374/141
• CPC Class Codes: F16C 19/38 with two or more rows of rollers
• CPC Class Codes: F16C 19/525 related to temperature and heat, e.g. insulation
• CPC Class Codes: F16C 2300/02 General use or purpose, i.e. no use, purpose, special adaptation or modification indicated or a wide variety of uses mentioned
• 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: G01K 1/024 for remote indication
• CPC Class Codes: G01K 1/14 Supports; Fastening devices; Arrangements for mounting thermometers in particular locations

Abstract

A bearing assembly with a temperature measuring device embedded in the housing and arranged so as to be responsive to the temperature within the housing. The bearing assembly includes a transmitter for transmitting the signal received from the measuring or sensing junction of the temperature measuring device to an instrument for determining the temperature sensed by the device.

Claims

1. An improved bearing assembly comprising:

(a) a bearing housing defining a shaft bore containing therein at least one bearing, said bearing adapted to rotatably support a shaft extending into said shaft bore;

(b) said housing further defining a receiving bore extending from a first location at an exterior surface of said housing towards said shaft bore to a second location radially inward of said first location, said receiving bore terminating prior to intersecting with said shaft bore to define a temperature measurement surface therein;

(c) a thermocouple, said thermocouple including dissimilar wires connected at a measuring junction, said measure injunction of said thermocouple being embedded in said receiving bore and located adjacent said temperature measurement surface so as to be responsive to the temperature within said housing; and

(d) a signal transmitter located proximate said housing for transmitting the signals received from the measuring junction to an instrument for determining the temperature sensed by the thermocouple at the measuring junction.

2. An improved bearing assembly as set forth in claim 1 above, wherein said receiving bore is unthreaded substantially along its entire length and further wherein said measuring junction of said thermocouple is embedded and secured against movement by an adhesive.

3. An improved bearing assembly as set forth in claim 2, wherein said receiving bore terminates approximately 1/16 inch prior to intersecting said shaft bore.

4. An improved bearing assembly as set forth in claim 2, wherein said adhesive substantially fills said receiving bore.

5. An improved bearing assembly as set forth in claim 1, wherein said measuring junction receiving bore is located offset from a plane passing through the center of said at least one bearing perpendicular to the axial direction of said shaft bore.

6. An improved bearing assembly as set forth in claim 1, wherein said transmitter is mounted directly to said bearing housing.

7. An improved bearing assembly comprising:

(a) a bearing housing containing at least one bearing therein and including a shaft bore for receipt of said bearing, said housing further including an unthreaded measuring junction receiving bore extending from a first location at an exterior surface of said housing toward said shaft bore to a second location radially inward of said first location, said receiving bore terminating prior to intersecting with said shaft bore to define a temperature measurement surface therein;

(b) a thermocouple, said thermocouple including a measuring junction, said measuring junction being secured in said housing in said measuring junction receiving bore by an adhesive and located adjacent said temperature measurement surface, said measuring junction arranged so as to be responsive to the temperature in said housing; and

(c) a signal transmitter located proximate said housing for transmitting the signals received from the measuring junction to an instrument for determining the temperature sensed by the thermocouple at the measuring junction.

8. An improved bearing assembly as in claim 7, wherein said receiving bore terminates approximately 1/16 inch prior to intersecting said shaft bore.

9. An improved bearing assembly as in claim 7, wherein said measuring junction receiving bore is located offset from a plane passing through the center of said at least one bearing perpendicular to the axial direction of said shaft bore.

10. An improved bearing assembly as set forth in claim 7, wherein said transmitter is mounted directly to said bearing housing.

11. An improved method of sensing bearing temperature in a bearing assembly, said method including the steps of:

(a) providing a bearing housing containing at least one bearing therein adapted to rotatably support a shaft in said housing, said housing defining a receiving bore extending from a first location adjacent an exterior surface of said bearing housing to a second location radially inward of said first location and defining a temperature measurement surface selectively spaced from an outer race of said bearing;

(b) providing a thermocouple including dissimilar wires connected at a measuring junction;

(c) placing said measuring junction of said thermocouple in said receiving bore at a location adjacent said temperature measurement surface in a manner so as to be responsive to the temperature within said housing; and

(d) providing a signal transmitter located proximate said housing for transmitting the signal received from the measuring junction to an instrument for determining the temperature sensed by the thermocouple at the measuring junction.

12. An improved method of sensing bearing temperature in a bearing assembly as in claim 11, further including the step of securing and embedding said measure injunction in said housing with an adhesive.

13. An improved method of sensing bearing temperature in a bearing assembly as in claim 11, and further including the step of mounting said transmitter directly to said housing.

14. An improved bearing assembly comprising:

(a) a bearing housing defining a shaft bore, said shaft bore containing at least one bearing therein adapted to rotatably support the shaft;

(b) said bearing housing further defining a receiving bore extending from a first location adjacent an exterior surface of said housing toward said shaft bore to a second location radially inward of said first location, said shaft bore terminating prior to intersecting with said shaft bore to define a temperature measurement surface at the second location, said temperature measurement surface spaced from said shaft bore by substantially 1/16 inch;

(c) a temperature measurement device, said temperature measurement device including a sensing portion placed in said temperature receiving bore at said temperature measurement surface, said sensing portion being embedded in said receiving bore and arranged so as to be responsive to the temperature within said housing.

15. An improved bearing assembly as set forth in claim 14, wherein said bearing assembly further includes a signal transmitter located proximate said housing for transmitting the signals received from the sensing portion to an instrument for determining the temperature sensed by the temperature measurement device.

16. An improved bearing assembly as set forth in claim 15, wherein said sensing portion is embedded in said receiving bore and secured against movement in said housing by an adhesive.

17. An improved bearing assembly as set forth in claim 16, wherein said adhesive substantially fills said receiving bore.

18. An improved bearing assembly as set forth in claim 14 above, wherein said receiving bore is unthreaded substantially along its entire length.

19. An improved bearing assembly as set forth in claim 18, wherein said sensing portion receiving bore is located offset from a plane passing through the center of said at least one bearing perpendicular to the axial direction of said shaft bore.

20. An improved bearing assembly as set forth in claim 14, wherein said temperature measurement device is a thermocouple.

21. An improved bearing assembly as set forth in claim 14, wherein said temperature measurement device is a resistance temperature detector.