| CPC B60B 27/0042 (2013.01) [B60B 27/0005 (2013.01); B60B 27/0036 (2013.01); B60B 27/0078 (2013.01); B60B 27/0094 (2013.01)] | 11 Claims |
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1. A hub-bearing unit with an axis of rotation (X), comprising:
a stationary, radially external ring;
a radially internal flanged hub, rotatable about axis (X) and comprising:
a radially internal first shoulder;
a radially internal second shoulder; and
a radially external first relief groove;
a section (SR) radially opposite the first relief groove,
wherein the flanged hub is configured to axially engage a stem of a constant velocity joint;
at least one row of rolling bodies interposed between the radially external ring and the radially internal flanged hub;
at least one radial ball bearing, wherein the at least one radial ball bearing comprises:
a first radial ball bearing; and
a second radial ball bearing interposed between the stem of the constant velocity joint and the flanged hub and opposite the first shoulder and the second shoulder;
wherein the second radial ball bearing mounts inside a seat of the flanged hub in an axially internal position relative to the first radial ball bearing, the seat delimited axially by the second shoulder of the flanged hub;
a spacer mounted inside the seat of the flanged hub axially between the second axial shoulder and the second radial ball bearing, wherein the spacer axially abuts the second shoulder,
wherein the seat comprises a second relief groove formed in an axially external position relative to the section (SR) of the flanged hub.
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11. A hub-bearing unit with an axis of rotation (X) and comprising:
a stationary, radially external ring;
a radially internal flanged hub, rotatable about axis (X) and comprising:
a radially internal first shoulder;
a radially internal second shoulder; and
a radially external first relief groove;
a section (SR) radially opposite the first relief groove,
wherein the flanged hub is configured to axially engage a stem of a constant velocity joint;
at least one row of rolling bodies interposed between the radially external ring and the radially internal flanged hub;
a radially inner ring interposed on an axially internal side of the radially internal flanged hub;
at least one radial ball bearing, wherein the at least one radial ball bearing comprises:
a first radial ball bearing;
a second radial ball bearing interposed between the stem of the constant velocity joint and the flanged hub and opposite the first shoulder and the second shoulder,
wherein the second radial ball bearing mounts inside a seat of the flanged hub in an axially internal position relative to the first radial ball bearing, the seat delimited axially by the second shoulder of the flanged hub;
a spacer mounted inside the seat of the flanged hub axially between the second axial shoulder and the second radial ball bearing, wherein the spacer axially abuts the second shoulder; and
a ring nut configured to clamp the second radial ball bearing and the spacer against the second shoulder of the flanged hub,
wherein the seat comprises a second relief groove formed in an axially external position relative to the section (SR) of the flanged hub,
wherein a radius of the second relief groove comprises between 1.8 mm and 2.2 mm,
wherein an axial length of the second relief groove comprises between 3.8 mm and 4.2 mm,
wherein an axially internal boundary of the second relief groove coincides radially with a center (C) of pressure between the rolling bodies of the at least one row of rolling bodies and a raceway of the radially internal ring,
wherein the first shoulder is radially adjacent to the first radial ball bearing, the second shoulder is radially adjacent to the second radial ball bearing, the first radial ball bearing is axially external and the second radial ball bearing is axially internal relative to the first radial ball bearing.
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