| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wheel rolling bearing device with which it is possible to prevent outer-row balls from running on an outer-side raceway shoulder while achieving weight reduction and stiffness increase. <P>SOLUTION: The inner-row and outer-row balls 50 and 51 are rotatably arranged between inner ring raceway surfaces 20 and 25 on an inner side and an outer side of a hub shaft 15 and outer ring raceway surfaces 40 and 45 on an inner side and an outer side of an outer ring member 30. When a pitch circle diameter of the inner-row ball 50 is D1 and a pitch circle diameter of the outer-row ball 51 is D2, D1 and D2 are set to satisfy relationship "D1<D2". When an angle of a raceway circular arc from an intersection point of each inner-row ball 50 with the inner-side outer ring raceway surface 40 at a contact angle to a boundary portion of the inner-side raceway shoulder is θ1 and an angle of a raceway circular arc from an intersection point 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 is θ2, θ1 and θ2 are set to satisfy relationship "θ1<θ2 ". <P>COPYRIGHT: (C)2012,JPO&INPIT |
