| 摘要 |
In a wheel rolling bearing device, where a pitch diameter of the inner-row ball (50) set is D1 and a pitch diameter of the outer-row ball set (51) is D2, D1 and D2 are set so as to satisfy the relationship "D1 < D2". Where an angle of a raceway circular arc from an intersection point (P1) of each inner-row ball (50) with the inner-side outer ring raceway surface (40) at a contact angle to a boundary portion of an inner-side raceway shoulder (41) is ¸1 and an angle of a raceway circular arc from an intersection point (P2) of each outer-row ball (51) with the outer-side outer ring raceway surface (45) at a contact angle to a boundary portion of an outer-side raceway shoulder (46) is ¸2, ¸1 and ¸2 are set so as to satisfy the relationship "¸1 < ¸2". |
