| 摘要 |
A wheel support bearing assembly includes an outer member (1) and an inner member (2), each having a raceway surface (3, 4). The inner member (2) is made up of a combination of a rotatable ring (9), having its outer periphery formed with a vehicle body fitting flange (9a), and a separate member (10). Each of the outer member (1) and the flanged rotatable ring (9) has a surface region representing a thermally refined structure formed by means of martensite hardening and high temperature tempering and also has a core region representing an as-forged structure made up of ferrite and pearlite.
|
