Rolling-element bearing for a gearing

Patent metadata

Field	Value
Publication number	US-2016169288-A1
Application number	US-201414907395-A
Country	US
Kind code	A1
Filing date	Jun 30, 2014
Priority date	Jul 29, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A rolling-element bearing for a gearing. The rolling-element bearing includes an inner bearing race ( 13 ), an outer bearing race ( 14 ), and at least one rolling element ( 15 ). The rolling-element bearing has a sensor ( 19 ) which is rigidly arranged in relation to a gearing part or a part of the rolling-element bearing. The rolling element includes a depth deviation ( 16 ), on at least one lateral surface ( 17 ), and the depth deviation is designed in such a way that the lateral surface of the rolling element has at least two different depths along a circular path about an axis of rotation of the rolling element and the sensor is positioned in order to detect the depth deviation.

First claim

1 - 12 . (canceled)

13 . A roller bearing ( 10 ) for a transmission, the roller bearing ( 10 ) comprises:
an inner bearing race ( 13 ), an outer bearing race ( 14 ), at least one rolling element ( 15 ), and a sensor ( 19 ) arranged fixed relative to either a transmission component or a part of the roller bearing ( 10 ), and the at least one rolling element ( 15 ) has at least one depth variation ( 16 ) on at least one lateral surface ( 17 ) thereof, the depth variation being designed such that along a circular path around a rotational axis of the rolling element ( 15 ), the lateral surface of the rolling element ( 15 ) has at least two different depths and the sensor being positioned so as to detect the depth variation.

14 . The roller bearing ( 10 ) for a transmission according to claim 13 , wherein a plurality of rolling elements ( 15 ) of the roller bearing ( 10 ) have depth variations ( 16 ).

15 . The roller bearing ( 10 ) according to claim 13 , wherein the at least one rolling element ( 15 ) has a plurality of depth variations ( 16 ).

16 . The roller bearing ( 10 ) according to claim 13 , wherein the at least one depth variation ( 16 ) is a recess.

17 . The roller bearing ( 10 ) according to claim 13 , wherein the at least one depth variation ( 16 ) is surplus material.

18 . The roller bearing ( 10 ) according to claim 13 , wherein the sensor ( 19 ) is attached to one of:
the inner bearing race ( 13 ) of the roller bearing ( 10 ); the outer bearing race ( 14 ) of the roller bearing ( 10 ); a cage of the roller bearing ( 10 ); a housing of the transmission; and a shaft ( 11 ) of the transmission.

19 . The roller bearing ( 10 ) according to claim 13 , wherein the sensor ( 19 ) is one of a distance sensor, an eddy current sensor, an inductive proximity sensor, a Hall sensor, and a gearwheel sensor.

20 . The roller bearing ( 10 ) according to claim 13 , wherein the roller bearing ( 10 ) comprises one of cylindrical rolling elements, conical rolling elements, radial rolling elements, and toroidal rolling elements.

21 . A rolling element ( 15 ) for the roller bearing ( 10 ) for a transmission according to claim 13 , wherein the transmission is for a wind power machine, the rolling element ( 15 ) comprises a rolling surface and at least one lateral surface, the at least one lateral surface has a depth variation such that along a circular path around a rotational axis of the rolling element ( 15 ), the rolling element ( 15 ) has at least two different depths.

22 . A method of determining at least one of a speed, a rotational speed and a slip of at least one rolling element ( 15 ) of a roller bearing ( 10 ), the method comprising:
providing a lateral surface of the at least one rolling element ( 15 ) with depth variations along a circular path around a rotational axis of the at least one rolling element ( 15 ); attaching a sensor ( 19 ) on a part of the roller bearing ( 10 ); detecting, with the sensor, the depth variations of the lateral surface of the at least one rolling element; and calculating at least one of the speed, the rotational speed and the slip of at least one rolling element from time intervals of sensor signals, based on movement of the depth variations past the sensor.

23 . A transmission in combination with a roller bearing ( 10 ) comprising:
an inner bearing race ( 13 ), an outer bearing race ( 14 ), at least one rolling element ( 15 ), and a sensor ( 19 ) arranged fixed relative to either a transmission component or a part of the roller bearing ( 10 ), and the at least one rolling element ( 15 ) has at least one depth variation ( 16 ) on at least one lateral surface ( 17 ) thereof, the depth variation being designed such that along a circular path around a rotational axis of the rolling element ( 15 ), the lateral surface of the rolling element ( 15 ) has at least two different depths and the sensor being positioned so as to detect the depth variation.

24 . Use of at least one of a rolling element according to claim 21 , wherein the rolling element is used in a transmission for a wind power machine.

Assignees

• Zahnradfabrik Friedrichshafen
• Zf Wind Power Antwerpen Nv

Inventors

• Leimann Dirk
• Engelen Kurt

Classifications

• G01P3/443

  mounted in bearings (bearings F16C) · CPC title

• F16C41/007 Primary

  Encoders, e.g. parts with a plurality of alternating magnetic poles · CPC title

• F16C33/34

  Rollers; Needles · CPC title

• F16C2300/14

  Large applications, e.g. bearings having an inner diameter exceeding 500 mm · CPC title

• F16C19/52

  with devices affected by abnormal or undesired conditions · CPC title