BEARING DEVICE FOR WHEEL AND MANUFACTURING METHOD THEREFOR

Title:

BEARING DEVICE FOR WHEEL AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2014/057770

Kind Code:

A1

Abstract:

A bearing device (1) for a wheel equipped with: an outer member (2) on the inner circumference of which multiple rows of outside raceway surfaces (7, 7) are formed; an inner member (11), which comprises a hub ring (3) provided with a wheel attachment flange (8) and at least one inner ring (4) that fits with a small-diameter step part (10) formed on the outer circumference of the hub ring (3), and on which multiple rows of inside raceway surfaces (9, 9) are formed opposing the outside raceway surfaces (7, 7); and multiple rolling bodies (5, 5) incorporated between the outside raceway surfaces (7, 7) and the inside raceway surfaces (9, 9). In addition, the inner ring (4) is immobilized in the axial direction by means of swage parts (17) formed by plastically deforming the end parts (26) of the small-diameter step part (10) of the hub ring (3) outward in the radial direction, and face splines (18) are formed on the end faces of the swage parts (17) by means of plastic forming. This bearing device is characterized in that the relationship S/M ≤ α×β is satisfied when M is the average diameter of the outer diameter (B) and the inner diameter (C) of the end parts (26) of the small-diameter step part (10) prior to the formation of the swage parts (17) of the hub ring (3), S is the outer diameter of the face splines (18), α is the value when the ductile elongation of the material of the hub ring (3) is expressed as a ratio, and β is a correction coefficient that is based on the working form.

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Inventors:

MATSUNAGA HIROSHI (JP)
TOSAJI MASAHIRO (JP)

Application Number:

PCT/JP2013/074935

Publication Date:

April 17, 2014

Filing Date:

September 13, 2013

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
MATSUNAGA HIROSHI (JP)
TOSAJI MASAHIRO (JP)

International Classes:

F16C33/62; B60B35/14; B60B35/18; F16C19/18; F16C33/64; F16D1/06; F16D3/20

Foreign References:

JP2010042764A	2010-02-25
JP2012045612A	2012-03-08
JP2000211302A	2000-08-02
JP2011031682A	2011-02-17

Other References: