Speed reducer including temperature sensing device

• US 5,844,501 A
• Filed: 03/18/1996
• Issued: 12/01/1998
• Est. Priority Date: 03/18/1996
• Status: Expired due to Fees

• Current Assignee: Reliance Electric Technologies LLC (ABB Limited)
• Original Assignee: Reliance Electric Industrial Company
• Inventors: El-Ibiary, Yehia
• Primary Examiner(s): Horabik, Michael
• Assistant Examiner(s): WONG, ALBERT KANG
• Application Number:
  US08/620,839
• Time in Patent Office: 988 Days
• Field of Search: 340/870.17, 340/449, 340/439, 340/870.11, 340/870.16, 73/295, 364/551.01, 384/448, 374/141, 376/245
• US Class Current: 340/870.11
• CPC Class Codes: F16C 19/52 with devices affected by abnormal or undesired conditions
• CPC Class Codes: F16C 19/525 related to temperature and heat, e.g. insulation
• CPC Class Codes: F16H 57/0412 Cooling or heating; Control of temperature
• CPC Class Codes: F16H 59/72 dependent on oil characteristics, e.g. temperature, viscosity

Abstract

An improved speed reducer having a temperature sensing device electrically connectible to an external monitoring device. The temperature sensing device is supported by the speed reducer housing and extends at least partially into the speed reducer interior area to a predetermined location. The predetermined location is below a minimum lubricant supply level within the speed reducer interior. The temperature sensing device is responsive to the temperature of the lubricant fluid within the speed reducer and is configured to communicate information indicative thereof to an external monitoring device, which may include an alarm or a downstream processing device.

Claims

1. An improved speed reducer and monitoring system, said system comprising in combination:

an open network monitoring and control circuit configured to receive and to monitor data from a plurality of separate, remote devices;

a plurality of separate devices independently coupled to said monitoring and control circuit and configured to transmit data to said monitoring and control circuit from separate locations in a machine system, said devices including at least one speed reducer comprising;

a housing rotatably supporting an input shaft and an output shaft mechanically interconnected to transfer mechanical power therebetween, said housing defining an interior area for containing a lubricant fluid to at least a minimum lubricant supply level when said speed reducer is in an upright position;

a temperature sensing device supported by said housing and extending at least partially into said interior area to a predetermined location, the predetermined location being below said minimum lubricant supply level, said temperature sensing device being responsive to temperature of the lubricant fluid and configured to generate a temperature signal representative thereof; and

an interface circuit local to said housing, the interface circuit being coupled to the temperature sensing device and to said monitoring and control circuit, the interface circuit converting the temperature signal to an output signal in accordance with a predetermined communications protocol for communication to the monitoring and control circuit in coordination with data from other of said separate devices.

2. The improved speed reducer and monitoring system as in claim 1, wherein said temperature sensing device is configured to detect when the lubricant fluid reaches a predetermined temperature and wherein said information is indicative of such occurrence.

3. The improved speed reducer and monitoring system as in claim 2, wherein said temperature sensing device includes a switch responsive to the temperature of the lubricant fluid in said interior area so that said switch is activated when the lubricant fluid reaches the predetermined temperature.

4. The improved speed reducer and monitoring system as in claim 1, wherein said temperature sensing device includes a casing extending through said housing in sealing engagement with said housing.

5. The improved speed reducer and monitoring system as in claim 4, wherein said temperature sensing device includes a temperature switch mounted at a predetermined temperature sensing location within said casing.

6. The improved speed reducer and monitoring system as in claim 4, wherein said temperature sensing device includes a thermocouple having a sensing tip mounted at a predetermined temperature sensing location within said casing.

7. The improved speed reducer and monitoring system as in claim 4, including a junction box connectible to said casing outside said housing for receiving said at least one communication line for connection to said monitoring and control circuit.

8. The improved speed reducer and monitoring system as in claim 1, wherein said monitoring and control circuit includes an audible alarm.

9. The improved speed reducer and monitoring system as in claim 1, wherein said monitoring and control circuit includes a visual alarm.

10. An improved speed reducer system, said speed reducer system comprising:

a control and monitoring network configured for coupling to a plurality of monitored devices at separate locations; and

a networkable gear reducer unit interfaceable with said network independently of other of said plurality of monitored devices, said gear reducer unit comprising;

a housing rotatably supporting an input shaft and an output shaft mechanically interconnected to transfer mechanical power therebetween, said housing defining an interior area for containing a lubricant fluid to at least a minimum lubricant supply level when said speed reducer is in an upright position; and

a plurality of sensors, including temperature sensing device, electrically connectible to said network, said temperature sensing device including;

casing in sealing engagement with said housing and extending through said housing into said interior area to a predetermined location, the predetermined location being below said minimum lubricant supply level, and

a temperature sensing element mounted within said casing and responsive to the temperature of the lubricant fluid in said interior area, said temperature sensing element configured to generate a temperature signal indicative of the temperature of said lubricant fluid; and

said speed reducer unit further comprising a data collection and transmission circuit supported by said housing to form a modular networkable unit, said data collection and transmission circuit being coupled to said temperature sensing element and configured to receive said temperature signal and to transmit said temperature signal to a monitoring and control circuit via said control and monitoring network.

11. The improved speed reducer system as in claim 10, wherein said temperature sensing element is a switch.

12. The improved speed reducer system as in claim 10, wherein said temperature sensing element is a thermocouple.

13. The improved speed reducer system as in claim 10, wherein said monitoring and control circuit includes an audible alarm.

14. The improved speed reducer system as in claim 10, wherein said monitoring and control circuit includes a visual alarm.

15. An improved speed reducer system, said speed reducer system comprising:

a plurality of separate, networkable speed reducer units, each speed reducer unit including;

a housing rotatably supporting an input shaft and an output shaft mechanically interconnected to transfer mechanical power therebetween, said housing defining an interior area for containing a lubricant fluid to at least a minimum lubricant supply level when said speed reducer is in an upright position;

a temperature sensing device supported by said housing and extending at least partially into said interior area to a predetermined location, the predetermined location being below said minimum lubricant supply level, said temperature sensing device being responsive to temperature of the lubricant fluid; and

a local transmitter supported on said housing to form a networkable unit interfaceable with a monitoring and control circuit independently of local transmitters of other of said plurality of speed reducer units, said local transmitter having an output port, said local transmitter being in electrical communication with at least said temperature sensing device to receive information at least indicative of the temperature of the lubricant fluid and subsequently providing status information at said output port in a predetermined format, wherein the status information at least in part corresponds to the temperature information;

said system further comprising a monitoring and control circuit coupled to the plurality of speed reducer units via a communications network, the monitoring and control circuit configured to receive and process status information from the plurality of speed reducer units.

16. The improved speed reducer system as in claim 15, wherein said temperature sensing device of at least one speed reducer unit is configured to detect when the lubricant fluid reaches a predetermined temperature and wherein the temperature information is indicative of such occurrence.

17. The improved speed reducer system as in claim 16, wherein said temperature sensing device of at least one speed reducer unit includes a switch responsive to the temperature of the lubricant fluid in said interior are of the respective speed reducer so that said switch is activated when the lubricant fluid reaches the predetermined temperature.

18. The improved speed reducer system as in claim 15, wherein said temperature sensing device of at least one speed reducer unit includes one of a thermocouple and a temperature switch.

19. The improved speed reducer system as in claim 16, wherein said local transmitter of each speed reducer unit has a unique electronic identifier associated therewith to facilitate communication with the monitoring and control circuit.

20. The improved speed reducer system as in claim 19, wherein said local transmitter of at least one speed reducer unit is configured to supply the status information from said output port via a serial digital format.

21. The improved speed reducer system as in claim 19, wherein said local transmitter of at least one speed reducer unit is configured to analyze the temperature information and provide processed data within the status information.