US 7,320,256 B2
Load measurement on rolling bearing with particular revolution speed measurements
Koichiro Ono, Kanagawa (Japan)
Assigned to NSK Ltd., Tokyo (Japan)
Appl. No. 10/534,748
PCT Filed Aug. 26, 2004, PCT No. PCT/JP2004/012679
§ 371(c)(1), (2), (4) Date May 12, 2005,
PCT Pub. No. WO2005/026680, PCT Pub. Date Mar. 24, 2005.
Claims priority of application No. P2003-321049 (JP), filed on Sep. 12, 2003.
Prior Publication US 2006/0042406 A1, Mar. 02, 2006
This patent is subject to a terminal disclaimer.
Int. Cl. G01L 1/00 (2006.01)
U.S. Cl. 73—862.541  [73/862.322] 6 Claims
OG exemplary drawing
 
1. A load measuring unit for a rolling bearing unit comprising:
a stationary ring;
a rotating ring arranged concentrically with the stationary ring;
a plurality of rolling elements provided rotatably between stationary-side raceways and rotating-side raceways, which are formed on mutual opposing portions of the stationary ring and the rotating ring in two rows or more respectively, respectively to direct a contact angle in an opposite direction mutually at least between a pair of rows;
at least a pair of revolution speed sensors for sensing revolution speeds of rolling elements, directions of contact angles of which are different mutually, in a pair of rows respectively; and
a calculator for calculating a load applied between the stationary ring and the rotating ring based on sensed signals fed from the revolution speed sensors;
wherein the contact angles of the rolling elements are differentiated mutually in respective rows.