Roller bearing arrangement with an angle sensor

Patent metadata

Field	Value
Publication number	US-9329022-B2
Application number	US-201113643465-A
Country	US
Kind code	B2
Filing date	Apr 26, 2011
Priority date	Apr 26, 2010
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

A roller bearing configuration having an angle sensor includes a roller bearing. The Angle sensor an absolute encoder with a sensor ring connected in a rotationally fixed manner to one of the bearing rings of the roller bearing, and a measuring element connected in a rotationally fixed manner to the second bearing ring, wherein coils, namely at least one transmitting coil and at least one receiving coil, are situated on the sensor ring, and the transmitting coil has an axis of symmetry, which is identical to the axis of rotation and is situated in an annular metallic pot core, which has a U-shaped cross section and is concentric with the axis of rotation of the roller bearing, and a receiving coil is situated partially inside and partially outside of the pot core.

First claim

What is claimed is:

1. A roller bearing configuration comprising:
a roller bearing having a first bearing ring and a second bearing ring concentric with an axis of rotation, the first and second bearing rings including an inner bearing ring and outer bearing ring, the roller bearing including rolling elements situated between the inner and outer bearing rings; and
an angle sensor coupled to the roller bearing for detection of an angular position of the first bearing ring in relation to the second bearing ring, the angle sensor including a sensor ring connected to the first and second bearing rings and a measuring element connected to the second bearing ring in a rotationally fixed manner, at least one transmitting coil and at least one receiving coil situated on the sensor ring, a signal being transmissible between the transmitting coil and the receiving coil via a magnetic circuit and a variable reluctance existing in the magnetic circuit due to the measuring element, the transmitting coil surrounding the axis of rotation and situated in a pot core having a U-shaped cross section, being concentric with the axis of rotation, being connected to one of the first and second bearing rings and forming a part of the magnetic circuit, the measuring element being a ring forming a magnetically conductive connection between legs of the U-shaped pot core, the receiving coil being situated partially inside and partially outside of the pot core.

2. The roller bearing configuration as recited in claim 1 wherein at least one of the transmitting and receiving coils is a printed circuit.

3. The roller bearing configuration as recited in claim 2 wherein the at least one receiving coil includes sine coils and cosine coils, each formed by multiple windings, the windings of the sine coils and the windings of the cosine coils being situated in alternation on layers stacked one above the other in the printed circuit, the printed circuit being designed as a multilayer circuit board.

4. The roller bearing configuration as recited in claim 3 wherein two winding configurations of one of the sine coils constructed from multiple intermingled windings and two winding configurations of one of the cosine coils, each constructed of multiple intermingled windings, are situated on each layer.

5. The roller bearing configuration as recited in claim 2 wherein the at least one receiving coil includes sine coils and cosine coils, each formed by multiple windings, the windings of the sine coils and the windings of the cosine coils being situated on a shared layer of the printed circuit, the printed circuit being designed as a multilayer circuit board.

6. The roller bearing configuration as recited in claim 5 wherein two windings of one of the sine coils and two windings of one of the cosine coils are situated on the shared layer.

7. The roller bearing configuration as recited in claim 1 further comprising a triggering and evaluation unit situated outside of the angle sensor and connected to the transmitting and receiving coils.

8. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring eccentric with the axis of rotation and connected to the inner ring as the second bearing ring.

9. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring concentric with the axis of rotation and having nonparallel cover surfaces connected to the inner ring as the second bearing ring.

10. The roller bearing configuration as recited in claim 8 wherein the sensor ring has an eccentric contour on a radially inner side as well as on a radially outer side.

11. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring eccentric with the axis of rotation and connected to the inner ring as the second bearing ring or in the form of a ring concentric with the axis of rotation and having nonparallel cover surfaces connected to the inner ring as the second bearing ring, the pot core having multiple break-throughs on a radially outer U leg.

12. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring eccentric with the axis of rotation and connected to the inner ring as the second bearing ring or in the form of a ring concentric with the axis of rotation and having nonparallel cover surfaces connected to the inner ring as the second bearing ring, the pot core being surrounded radially by a retaining element attached to the outer ring.

13. The roller bearing configuration as recited in claim 12 wherein the retaining element is an injection-molded plastic part.

14. The roller bearing configuration as recited in claim 12 wherein the retaining element is surrounded radially by a supporting ring made of metal, the supporting ring contacting an end face of the outer ring.

15. The roller bearing configuration as recited in claim 14 wherein the supporting ring protrudes beyond the pot core in the axial direction, the supporting ring having a fastening strap bent radially inward from a circumference in an area protruding beyond the pot core for retaining a cable connected to the sensor ring.

16. The roller bearing configuration as recited in claim 14 wherein the supporting ring protrudes beyond the pot core in the axial direction, the supporting ring having a recess on a circumference, a strip-shaped cable bracket designed in one piece with the pot core protruding radially outward through the recess.

17. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring eccentric with the axis of rotation and connected to the inner ring as the second bearing ring or in the form of a ring concentric with the axis of rotation and having nonparallel cover surfaces connected to the inner ring as the second bearing ring, a radially outer U leg of the pot core being situated radially outside of the inner ring, and a radially inner U leg of the pot core being situated radially inside of a track of the rolling element formed by the inner ring.

18. The roller bearing configuration as recited in claim 1 wherein the roller bearing is a radial bearing, the sensor ring being connected to the outer ring as the first bearing ring, and the measuring element being in the form of a ring eccentric with the axis of rotation and connected to the inner ring as the second bearing ring or in the form of a ring concentric with the axis of rotation and having nonparallel cover surfaces connected to the inner ring as the second bearing ring, a sealing gap being formed between a radially inner U leg of the pot core and an end face of the inner ring.

19. The roller bearing configuration as recited in claim 1 further comprising a spacer disk made of a nonmagnetic material situated between legs of the U-shaped pot core.

20. The roller bearing configuration as recited in c

Assignees

• Kegeler Joerg
• Weyh Juergen
• Schaeffler Technologies Ag

Inventors

• Kegeler Joerg
• Weyh Juergen

Classifications

• G06F1/00

  Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00 (architectures of general purpose stored program computers G06F15/76) · CPC title

• F16C19/06

  with a single row or balls · CPC title

• F16C41/00 Primary

  Other accessories, {e.g. devices integrated in the bearing not relating to the bearing function as such} · CPC title

• G06F2200/00

  Indexing scheme relating to G06F1/04 - G06F1/32 · CPC title

• G01M1/00

  Testing static or dynamic balance of machines or structures · CPC title