Ntn Corporation

Shun Tamaki

Tomoko Baba

Tasuku Furukawa

Masaaki Hayashi

Sadayuki Kubota

Provided is a rotational torque inspection method for a bearing device for vehicle wheel that enables detection of an abnormality in a component or step occurring midway in the manufacturing of the wheel bearing device. This rotational torque inspection method for a wheel bearing devicecomprises: a press-fitting step S; a post-press-fitting rotational torque measurement step Sfor measuring a rotational torque Tof the wheel bearing devicewhen, after the press-fitting step S, the hub ringand the inner ringthat are inner members and an outer ringthat is an outer member are rotated in a relative manner; and a post-press-fitting rotational torque determination step Sfor determining the fitness of the rotational torque Tby whether or not the rotational torque Tmeasured in the post-press-fitting rotational torque measurement step Sis within a range of standard values S

Rotational torque inspection method for bearing device for vehicle wheel, and rotational torque inspection device for bearing device for vehicle wheel

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.

Preload inspection method for bearing device for vehicle wheel

A bearing device for a wheel, which has improved axial assembly accuracy of a sealing member by reducing the amount of springback. The bearing device for a wheel comprises an inner sealing member that blocks an inner opening end of an annular space formed by an outer ring and an inner ring. A sealing ring of the inner sealing member has a core metal fitting in the outer ring and an elastic member joined to the core metal. The elastic member has: a pressing part that is pressed inward in the axial direction when the sealing ring is press-fitted into the outer ring; and a non-pressing part that is not pressed inward in the axial direction when the sealing ring is press-fitted into the outer ring, wherein the axial thickness of the pressing part is thinner than the axial thickness of the non-pressing part.

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Shizuoka, Japan

Shun Tamaki