Koyo Seiko Company, Ltd.

Nobuyoshi Murakami

Kazutoshi Toda

Shinichirou Kashiwagi

Tadashi Mitarai

Naoki Morimura

Shunji Morimoto

Koichi Nate

Yasuhiro Miyata

A flange face portion located radially outwardly of boltholes of a flange is formed as a tilting face so that a maximum oppositely-spaced distance &#x3b1; of the flange face portion from a disc rotor is preferably 10 &#x3bc;m. Thereby, minimization is implemented for convex deformation of an outer circumferential end portion of the flange when bolts are press-inserted into boltholes, when nuts are tightened onto bolts, tightening forces compress the disc rotor and the flange to be in close contact and to be fixed-via planar surfaces thereof without clearance being formed therebetween. Consequently, the accuracy of side run-out with surface of the flange can be prevented from being deteriorated.

Wheel-use bearing apparatus

A bearing device in which a rolling bearing is fitted on one axial end of a shaft and in which the one axial end of the shaft is caulked to fix the rolling bearing while preventing the same from coming out. The shape of the outer end face of the caulked portion is devised to maximize the resistance to the coming-out by the caulked portion.

Bearing device

A flange face portion located radially outwardly of boltholes of a flange is formed as a tilting face so that a maximum oppositely-spaced distance &#x3b1; of the flange face portion from a disc rotor is preferably 10 &#x3bc;m. Thereby, minimization is implemented for convex deformation of an outer circumferential end portion of the flange when bolts are press-inserted into boltholes, when nuts are tightened onto bolts, tightening forces compress the disc rotor and the flange to be in close contact and to be fixed via planar surfaces thereof without clearance being formed therebetween. Consequently, the accuracy of side run-out with surface of the flange can be prevented from being deteriorated.

In a double-row rolling bearing, there is a uniform relationship between a pre-load applied to the bearing and a pre-load gap formed by elastic transformation of rollers and some parts related to the rollers. Therefore, to measure the pre-load is equivalent to measure the pre-load gap. Then, a pre-load gap is measured at every row of the rollers, and measured values of the pre-load gaps are added together to thereby obtain an entire pre-load gap of the bearing.

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Kashiwara, Japan

Nobuyoshi Murakami