NTN

In a seal plate (19) press-fitted and fixed to an inner peripheral surface of an outer joint member (2) for a constant velocity universal joint, an outer peripheral surface of the seal plate (19) in contact with the inner peripheral surface of the outer joint member (2) has a surface hardness of 140 Hv or more and 160 Hv or less.

In a parallel link mechanism (9), a distal end side link hub (13) is coupled to a proximal end side link hub (12) via three link mechanisms (14) such that a posture of the distal end side link hub (13) can be changed. Each link mechanism (14) includes a proximal side end link member (15), a distal side end link member (16), and a center link member (17), and forms a quadric chain link mechanism (14) composed of four revolute pairs. A singular point occurs when a central axis (QA, QB) of the proximal or distal end side link hub (12, 13) and a central axis (O2, O3) which is a rotation axis of a revolute pair section of the proximal or distal side end link member (15, 16) and the center link member (17) coincide with each other. An axis angle (γ) of the center link member (17) is specified such that a posture in which the singular point occurs is avoided.

Provided is a bearing device for a vehicle wheel (1) capable of increasing a pitch circle diameter of a rolling element on an outer side to improve mechanical characteristics such as camber rigidity of the bearing device for a vehicle wheel (1) without impairing maintainability of a vehicle.The bearing device for a vehicle wheel (1) includes an outer ring (2), a hub ring (3), an inner member including an inner ring (4) fitted to the hub ring (3) on an inner side of an inner raceway surface (3c), an outer side ball row (6), and an inner side ball row (5). A wheel mounting flange (3b) includes a tap hole (3e) into which a wheel bolt (3f) is inserted from the outer side. A pitch circle diameter of the outer side ball row (6) is larger than a pitch circle diameter of the inner side ball row (5). A thickness (Ha) of the wheel mounting flange (3b) forming the tap hole (3e) is 1.02 times or more and less than 1.3 times a nominal diameter (R) of the wheel bolt (3f) to be inserted.

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …