To provide a hub unit bearing facilitating design for efficiently discharging water to the external space through the through holes from the gap between the bottom surface of the annular groove and the axial inner surface of the rotating body for braking, while ensuring strength and rigidity of the rotary flange.SOLUTION: A rotary flange 9 has: an annular groove 11 centered on a central axis C in an axial outer surface; female screw holes 13 with an axial outer end being open only in a bottom surface 12, arranged at a plurality of locations in a circumferential direction; and a through hole 14 at least at one place in the circumferential direction. A diameter of an inscribed circle of the through hole 14 centered on the central axis C is smaller than an outer diameter of the annular groove 11, and a diameter of a circumscribed circle of the through hole 14 centered on the central axis C is larger than the outer diameter of the annular groove 11. An axial depth of a portion radially outside a circumscribed circle of the female screw hole 13 centered on the central axis C in the annular groove 11 is deeper than an axial depth of a portion radially inside the circumscribed circle of the female screw hole 13 centered on the central axis C in the annular groove 11.SELECTED DRAWING: Figure 1
ハブユニット軸受
2024-05-21
Patent
Electronic Resource
Japanese
IPC: | B60B VEHICLE WHEELS , Räder für Fahrzeuge |