TORQUE CALCULATION METHOD FOR FOUR-PONT CONTACT BALL BEARING, CALCULATION DEVICE, AND CALCULATION PROGRAM

Title:

TORQUE CALCULATION METHOD FOR FOUR-PONT CONTACT BALL BEARING, CALCULATION DEVICE, AND CALCULATION PROGRAM

Document Type and Number:

WIPO Patent Application WO/2011/089977

Kind Code:

A1

Abstract:

Provided are a calculation method, a calculation device, and a calculation program which are capable of obtaining high-accuracy torque values by taking into consideration the effect of the fact that contact states are different, such an approach being a task unique to a four-point contact ball bearing. Said method serves to calculate rotational torque acting between the inner race and the outer race of a four-point contact ball bearing, and comprises individual torque calculating process (V1) which calculates rotational torque T for individual rolling elements, and a sum total calculating process (V2) wherein the sum of the rotational torque T of all rolling elements is obtained and the resulting sum is taken as the rotational torque acting between said inner race and said outer race. In the individual torque calculating process, calculation is made using information pertaining to a contact state which is at a level close to either a two-point-contact state or a four-point-contact state. As regards this contact state, a four-point contact ratio Cf is used which is the ratio of a lower contact pressure to a higher contact pressure, said lower contact pressure and said higher contact pressure being the lower and the higher, respectively, of P1 and P2, said P1 and P2 each being the maximum contact pressure between the rolling elements and one of the two partial raceway surfaces forming the raceway surface of the inner race or the outer race.

Inventors:

HORI MICHIO (JP)
SAKAGUCHI TOMOYA (JP)

Application Number:

PCT/JP2011/050525

Publication Date:

July 28, 2011

Filing Date:

January 14, 2011

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
HORI MICHIO (JP)
SAKAGUCHI TOMOYA (JP)

International Classes:

F16C19/14; G01M13/04

Foreign References:

JP2003172341A	2003-06-20
JP2000162092A	2000-06-16
JP2006177774A	2006-07-06

Other References: