Integrated circuit and seal

• US 5,648,614 A
• Filed: 08/17/1995
• Issued: 07/15/1997
• Est. Priority Date: 06/24/1993
• Status: Expired due to Fees

• Current Assignee: Firma Carl Freudenberg
• Original Assignee: Firma Carl Freudenberg
• Inventors: Kuhlmann, Thomas, Wentzler, Hanno, Martsfeld, Rainer, Vogt, Rolf
• Primary Examiner(s): Chilcot, Richard
• Assistant Examiner(s): THOMPSON, JEWEL VERGIE
• Application Number:
  US08/583,793
• Time in Patent Office: 698 Days
• Field of Search: 73/706, 73/724, 73/727, 73/592, 73/768, 73/726, 277/2, 277/901, 384/448, 384/484, 324/166, 324/173
• US Class Current: 73/706
• CPC Class Codes: F16J 15/326 with means for detecting or measuring relative rotation of the two elements
• CPC Class Codes: F16J 15/3264 the elements being separable from each other
• CPC Class Codes: G01D 11/24 Housings ; Casings for instruments
• CPC Class Codes: G01D 11/245 Housings for sensors
• CPC Class Codes: G01L 9/08 by making use of piezoelectric devices , i.e. electric circuits therefor
• CPC Class Codes: G01M 3/183 for pipe joints or seals
• CPC Class Codes: G01P 3/443 mounted in bearings bearings F16C

Abstract

A seal comprising two rings is disclosed. A sensor or signal generator is immovably affixed to the polymeric member of one of the rings. In one embodiment, the other of the rings includes a corresponding sensor or signal generator, depending on which of these types of elements is affixed to the first ring, that is immovably affixed to the second ring.

Claims

1. A seal comprising:

a sealing member made of a polymer;

a first, flexible auxiliary element that is immovably affixed to the sealing member, said auxiliary element being selected from the group consisting of a pulse generator and a sensor;

a machine part that is moveable relative to the sealing member;

a second auxiliary element that is immovably affixed to the machine part, said second auxiliary element being selected from the group consisting of a pulse generator and a sensor, and wherein the second auxiliary element is a pulse generator when the first auxiliary element is a sensor and wherein the second auxiliary element is a sensor when the first auxiliary element is a pulse generator;

wherein the first auxiliary element moves with respect to the second auxiliary element whenever the sealing member moves with respect to the machine part.

2. The seal according to claim 1, wherein the first auxiliary element is embedded in the sealing member.

3. The seal according to claim 1, wherein the first auxiliary element is bonded to the surface of the sealing member.

4. The seal according to claim 1, wherein one of the first and the second auxiliary elements has a ring shape.

5. The seal according to claim 2, wherein one of the first and the second auxiliary elements has a ring shape.

6. The seal according to claim 3, wherein one of the first and the second auxiliary elements has a ring shape.

7. The seal according to claim 1, further comprising a flexible conductor that is electrically connected to at least one of the auxiliary elements so as to provide a means for providing an external electrical connection thereto.

8. The seal according to claim 1, wherein at least one of the auxiliary elements is piezoelectric.

9. The seal according to claim 5, wherein at least one of the auxiliary elements is piezoelectric.

10. The seal according to claim 1, wherein at least one of the auxiliary elements contains a capacitor and a resistor.

11. The seal according to claim 1, wherein at least one of the auxiliary elements comprises a thermoelement.

12. The seal according to claim 1, wherein the relatively movable machine part and the sealing element are packaged together in the form of a cassette.

13. The seal according to claim 12, wherein the second auxiliary element is configured to be located adjacent the first auxiliary element.

14. A seal comprising:

a first inner sealing ring;

a second outer sealing ring made of polymer, at least one of said first and second sealing rings being rotatable with respect to the other sealing ring;

at least one flexible sensor attached to one of the sealing rings; and

at least one flexible signal generator attached to the other of the sealing rings.

15. A seal as set forth in claim 14, wherein the sensor is bonded to the surface of a sealing ring.

16. A seal as set forth in claim 14, wherein the signal generator is bonded to the surface of a sealing ring.

17. A seal as set forth in claim 14, wherein the signal generator is embedded in the surface of a sealing ring.

18. A seal as set forth in claim 14, wherein the signal generator is embedded in the surface of a sealing ring.

19. A seal according to claim 14, wherein the sensor comprises a piezoelectric material.

20. A seal according to claim 14, further comprising a capacitor and resistor circuit to detect the presence of moisture.

21. A seal according to claim 14, wherein the sensor comprises a thermoelement.

22. A seal according to claim 14, wherein the sealing rings, sensor, and signal generator are combined together in a cassette-like cartridge.

23. A seal according to claim 14, wherein the sensor is in facing relation to the signal generator across a gap.

24. A seal comprising:

a first inner sealing ring;

a second outer sealing ring made of polymer that is rotatable with respect to the first inner sealing ring; and

at least one flexible sensor attached to one of the sealing rings.