Ntn Corporation

Sadayuki Kubota

Tomoko Baba

Shun Tamaki

Masaaki Hayashi

The rotational torque inspection method for a bearing device comprises: a press-fitting step (S); a first bearing preload value calculation step (S) for calculating a first bearing preload value (P); a post-press-fit rotational torque measurement step (S) for measuring a post-press-fit rotational torque (Ta); a crimping step (S) for crimping the small diameter step part to the inner ring; a post-crimping rotational torque measurement step (S) for measuring a post-crimping rotational torque (Tb); a second bearing preload value calculation step (S) for calculating a second bearing preload value (P); and a determination step (S) for determining the suitability of the preload depending on whether or not the second bearing preload value (P) is within a range of a reference value.

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Shizuoka, Japan

Sadayuki Kubota