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:
Apr. 07, 2015
Filed:
Jul. 19, 2012
Michio Hori, Kuwana, JP;
Tomoya Sakaguchi, Kuwana, JP;
Michio Hori, Kuwana, JP;
Tomoya Sakaguchi, Kuwana, JP;
NTN Corporation, Osaka, JP;
Abstract
The method for calculating rotational torque between inner and outer rings of a four point contact ball bearing assembly includes an individual torque calculation step for calculating the rotational torque for each of rolling elements and a total sum calculation step for determining the rotational torque. In the individual torque calculation step, data on a contact condition representative of the extent of approximation to the two point contact state or four point contact state is used. For the contact condition data, the four point contact ratio C, which is the ratio of surface pressure of one of respective maximum contact pressures Pand Pbetween two partial raceways in an inner ring or outer ring, which one is higher than the other of the maximum contact pressures Pand P, relative to a surface pressure of the other of the maximum contact pressures, is used.