Back to results
US 2001/0019223 A1Published application
Bearing unit for wheel and method of manufacturing the same
AssigneeNsk Ltd.
InventorTakeyasu Kaneko
Life of this patent
Estimating the term…
Abstract
At a surface opposite to a mounting surface 28 at a part of the mounting flange 13, a projecting part 27 is provided so as to surround the opening part of the mounting holes 23 for press-fitting each stud thereinto. A finishing process of the mounting surface 28 is carried out after the stud 24 is press-fitted into the mounting hole 23.
Claims4
A bearing unit for a wheel, comprising:
- a stationary ring having a stationary-side raceway surface provided at a stationary-side periphery thereof, and fixedly supported by a suspending apparatus under a condition of being used;
- a rotary ring having a rotary side-raceway surface provided at the rotary side-periphery thereof and hardened by a heat treatment;
- a plurality of rolling elements provided between the rotary side-raceway surface and the stationary-side raceway surface;
- a mounting flange provided at the outer periphery of the rotary ring, for fixedly connecting a rotary body for braking and a wheel to a mounting surface which is one side surface thereof under a condition of being used, said mounting flange having plural mounting holes communicating between the one side surface and the other side surface;
- and
- a plurality of studs, each of which has a distal end protruded from the mounting surface under a condition where the respective base portions thereof are press-fitted into the plural mounting holes of the mounting flange,
- wherein a portion surrounding an end open of each of said mounting holes at least projects at the other side surface of the mounting flange in an axial direction than a remaining portion of the mounting flange, and the surrounding portion of each mounting hole is thicker than the remaining portion of the mounting flange.
4 more elements
A bearing unit for a wheel, comprising:
- a stationary ring having a stationary-side raceway surface provided at a stationary-side periphery thereof, and fixedly supported by a suspending apparatus under a condition of being used;
- a rotary ring having a rotary side-raceway surface provided at the rotary side-periphery thereof and hardened by a heat treatment;
- a plurality of rolling elements provided between the rotary side-raceway surface and the stationary-side raceway surface;
- a mounting flange provided at the outer periphery of the rotary ring, for fixedly connecting a rotary body for braking and a wheel to a mounting surface which is one side surface thereof under a condition of being used, said mounting flange having plural mounting holes communicating between the one side surface and the other side surface;
- and
- a plurality of studs, each of which has a distal end protruded from the mounting surface under a condition where the respective base portions thereof are press-fitted into plural mounting holes of the mounting flange,
- wherein the mounting surface of the mounting flange defines a flat surface with a substantially constant surface precision by processing into a predetermined shape, after the rotary side-raceway surface thereof is heat-treated, and the base portion of each stud is fixedly press-fitted into the mounting hole.
4 more elements
A method of manufacturing a bearing unit, including:
- a stationary ring having a stationary-side raceway surface provided at a stationary-side periphery thereof, and fixedly supported by a suspending apparatus under a condition of being used;
- a rotary ring having a rotary side-raceway surface provided at the rotary side-periphery thereof and hardened by a heat treatment;
- a plurality of rolling elements provided between the rotary side-raceway surface and the stationary-side raceway surface;
- a mounting flange provided at the outer periphery of the rotary ring, for fixedly connecting a rotary body for braking and a wheel to a mounting surface which is one side surface thereof under a condition of being used, said mounting flange having plural mounting holes communicating between the one side surface and the other side surface;
- and
- a plurality of studs, each of which has a distal end protruded from the mounting surface under a condition where the respective base portions thereof are press-fitted into plural mounting holes of the mounting flange, the method comprising the steps of:
- hardening the rotary side-raceway surface of the rotary ring by a heat treatment;
- press-fitting the base portion of each stud into each hole of the mounting flange to fix the stud therein;
- processing the mounting surface of the mounting flange into a predetermined configuration;
- and
- processing the rotary side-raceway surface into a predetermined configuration and dimension by utilizing the processed mounting surface as a reference surface.
8 more elements
Dependencies are inferred from the claim text.