| 摘要 |
Provided is a bearing device for a wheel, including a bearing forawheelincluding: an outer member; an inner member; and double-row rolling elements, the bearing for a wheel having a constant velocity universal joint coupled thereto in a torque transmittable manner by fitting a stem section (29) of an outer joint member (23) to a shaft hole (33) of a hub wheel (1), in which the outer joint member (23) includes a plurality of convex portions (32) formed on the stem section (29) of the outer joint member (23) so as to extend in an axial direction of the outer joint member (23), in which the hub wheel (1) includes a plurality of concave portions (35) formed in the shaft hole (33) of the hub wheel (1) so as to have interferences (n) with only circumferential side wall portions (40) of each of the plurality of convex portions (32), in which the stem section (29) of the outer joint member (23) is press-fitted to the shaft hole (33) of the hub wheel (1), and shapes of only the circumferential side wall portions (40) of the each of the plurality of convex portions (32) are transferred to the shaft hole (33), to thereby define a convex and concave fitting portion in which close contact is achieved at an entire contact portion between the plurality of convex portions (32) and the plurality of concave portions (35), in which the hub wheel (1) further includes a guide portion having concave portions (39) formed therein, which is provided on a side where the stem section is press-fitted with respect to the convex and concave fitting portion, in which a maximum diameter (Õ1) of each of the concave portions (39) of the guide portion is set larger than a maximum diameter of each of the plurality of concave portions (35) of the shaft hole (33), and in which the maximum diameter (Õ2) of the each of the plurality of concave portions (35) of the shaft hole (33) is set larger than a maximum diameter (Õ3) of the each of the plurality of convex portions (32) of the stem section (29). |
