TRANSDUCER FOR A ROTATING BODY

• US 20080034894A1
• Filed: 08/08/2007
• Published: 02/14/2008
• Est. Priority Date: 08/08/2006
• Status: Active Grant

• Current Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Original Assignee: MTS Systems Corporation (Illinois Tool Works Inc.)
• Inventors: Meyer, Richard A., Olson, Douglas J., Kunsch, Ian T., Josephson, Robert Leo
• Granted Patent: US 7,726,205 B2
• Time in Patent Office: Days
• US Class Current: 73/862.041
• CPC Class Codes: G01L 3/14 wherein the torque-transmitting element is other than a torsionally-flexible shaft
• CPC Class Codes: G01L 5/1627 of strain gauges using piezoresistors G01L5/162

Abstract

A load cell assembly for sensing force and/or moment components on a rotating body supported by a frame includes an axle having opposite ends joined to the frame. A hub is supported by the axle and rotatable about a longitudinal axis thereof. A load cell body joined to the hub and the rotating body is used to sense force and/or moment components between the hub and the rotating body.

Claims

1. A load cell assembly for sensing force and/or moment components on a rotating body supported by a frame, the assembly comprising:

an axle having opposite ends joined to the frame;

a hub supported by the axle and rotatable about a longitudinal axis thereof; and

a load cell body joined to the hub and the rotating body to sense force and/or moment components between the hub and the rotating body.

2. The load cell assembly of claim 1 and further comprising a slip ring assembly disposed in the hub having a first member movable relative to a second member, the first member being rotatable with the hub.

3. The load cell assembly of claim 2 and further comprising a bearing joined to the hub and supported by the axle.

4. The load cell assembly of claim 3 and further comprising a second bearing joined to the hub and supported by the axle, the second bearing being spaced apart from the first-mentioned bearing on the axle.

5. The load cell assembly of claim 4 wherein the slip ring assembly is disposed between the first-mentioned bearing and the second bearing.

6. The load cell assembly of claim 5 wherein the hub comprises a first portion joined to the first-mentioned bearing and to the load cell body, and a second portion joined to the second bearing and to the load cell body.

7. The load cell assembly of claim 6 wherein the second member includes a bore through which the axle extends.

8. The load cell assembly of claim 7 and further comprising a pair of spacers through which the axle extends wherein a spacer is disposed between each of the bearings and the second member.

9. The load cell assembly of claim 8 wherein the axle includes a groove through which wires from the second member extend to an end of the axle.

10. The load cell assembly of claim 7 wherein the axle includes a groove through which wires from the second member extend to an end of the axle.

11. The load cell assembly of claim 7 wherein wires from the second member extend to an end of the axle through a channel formed between one of the spacers and the axle.

12. The load cell assembly of claim 3 and further comprising a seal at each end of the axle where the first-mentioned bearing, the second bearing and the slip ring assembly are disposed between the seals.

14. The combination of claim 12 and further comprising a first bearing joined to the hub and a second bearing joined to the hub, the second bearing being spaced apart from the first bearing on the axle.

15. The combination of claim 14 wherein the hub comprises a first portion joined to the first bearing and to the load cell body, and a second portion joined to the second bearing and to the load cell body.

16. The combination of claim 15 wherein the load cell includes a central hub and an annular rim, wherein the central hub is joined to each hub portion.

17. The combination of claim 16 and further comprising a slip ring assembly having a first member movable relative to a second member, the first member being rotatable with the load cell body.

18. The combination of claim 17 wherein the second member includes a bore through which the axle extends.

19. The combination of claim 17 wherein wires from the second member extend along a length of the axle to one of the ends thereof.

13. In combination with a frame portion of a motorcycle or similar wheel assembly, a load cell assembly for sensing force and/or moment components on the motorcycle or similar wheel assembly, the load cell assembly comprising:

an axle mounted at each end to the frame portion;

a hub supported by the axle;

a rim;

a tire supported on the rim; and

a load cell body operatively joined to the hub and the rim.

20. The combination of claim 13 and further comprising a slip ring assembly disposed in the hub wherein the axle extends through a portion of the slip ring assembly.

21. A load cell assembly for sensing force and/or moment components on a rotating body supported by a frame, the assembly comprising:

an axle joined to the frame on at least one end of the axle;

a hub supported by the axle and rotatable about a longitudinal axis thereof;

a load cell body joined to the hub and the rotating body to sense force and/or moment components between the hub and the rotating body; and

a slip ring assembly disposed in the hub having a first member movable relative to a second member, the first member being rotatable with the hub.

22. The load cell assembly of claim 21 wherein the load cell includes a central hub and an annular rim, wherein the central hub is joined to each hub portion.

23. The load cell assembly of claim 22 and further comprising a slip ring assembly having a first member movable relative to a second member, the first member being rotatable with the load cell body.

24. The load cell assembly of claim 23 wherein the second member includes a bore through which the axle extends.

25. The load cell assembly of claim 23 wherein wires from the second member extend along a length of the axle to one of the ends thereof.

26. The load cell assembly of claim 23 and further comprising at least one spacer having an aperture through which the axle extends, and wherein the second member includes an aperture through which the axle extends, and wherein when the axle is in tension the second member is held in position on the axle by compressive forces placed in the second member and the spacer.