The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2004
Filed:
May. 29, 2001
Johannes Andrianus Duits, Bodegraven, NL;
Johannes Albertus Van Winden, Heidelberg, DE;
Eduardus Gerardus Maria Holweg, Delft, NL;
Anton Paweletz, Fellbach, DE;
SKF Engineering and Research Centre, B.V., Nieuwegein, NL;
Abstract
A bearing is provided including a first part provided with a first coil ( ) and a second part rotatable with respect to the first part about a bearing axis and being provided with a second coil which is electromagnetically coupled to the first coil. The first and second coil are magnetically enclosed by a first covering and a second covering, respectively. The first covering is fixed to the first part and the second covering is fixed to the second part. An air gap is formed between facing ends of the first and second coverings, with at least one of the facing ends of the first and second coverings being provided with at least one recession, such that the air gap varies when the first part and second part rotate with respect to each other. This may be used to provide an indication of speed (bearing rotation) without further sensors. Next to contactless transmission of power or data signals, the coupling between the first and second coil vary to provide a signal representative of the relative rotational speed of the first part of the bearing with respect to the second part.