Claims
- 1. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a crimped portion formed on the end side of the step portion, and the shaft being made of a carbon steel containing carbon in the range of from 0.20% to 0.60%,
and an inner ring fitted onto the step portion and having an inner ring raceway thereon, and the inner ring being fixed to the shaft by the crimped portion of the shaft by way of an oscillation press, and the inner ring having an outer peripheral surface retained by a retaining jig during crimping, wherein a tilting angle of an oscillation die is in the range of from 0.5 to 5.0 degrees, and an oscillation rotating speed is in the range of from 100 to 500 cycles per minute.
- 2. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,
a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being quench hardened at an area including at least the abutment portion with the first inner ring and the corner portion of the step portion, the crimped portion being kept as formed without quenched hardened, and the first and second inner rings being fixed to the shaft by the crimped portion of the shaft.
- 3. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,
a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being quench hardened at an area including the base portion of the mounting flange, the abutment portion with the first inner ring an the corner portion of the step portion, the crimped portion being kept as formed without quenched hardened, and the first and second inner rings being fixed to the shaft by the crimped portion of the shaft.
- 4. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,
a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being integrally quench hardened at an area including the base portion of the mounting flange and part of the fitting face with the inner rings, the crimped portion being kept as formed without quenched hardened, and the first and second inner rings being fixed to the shaft by the crimped portion of the shaft.
- 5. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,
a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being made of a carbon steel containing carbon in the range of from 0.20 weight % to 0.6 weight %, and at least the cylindrical portion being kept as forged and without annealed.
- 6. A bearing unit for vehicle wheel support comprising a shaft having a mounting flange, a step portion formed on one end portion thereof, and a substantially cylindrical portion formed on the end side of the step portion and crimped,
a first inner ring formed with a first inner ring raceway thereon, and a second inner ring formed with a second inner ring raceway thereon, the first and second inner rings fitted onto the step portion of the shaft, wherein the shaft being made of a carbon steel containing carbon in the range of from 0.60 weight % to 1.10 weight %, and at least the cylindrical portion being annealed after forging.
Priority Claims (4)
Number |
Date |
Country |
Kind |
H9-6343 |
Jan 1997 |
JP |
|
H9-158878 |
Jun 1997 |
JP |
|
H9-232798 |
Aug 1997 |
JP |
|
H9-321055 |
Nov 1997 |
JP |
|
Parent Case Info
[0001] This is a continuation of U.S. application Ser. No. 09/005,716, filed Jan. 16, 1998, now pending.
Continuations (1)
|
Number |
Date |
Country |
Parent |
09005716 |
Jan 1998 |
US |
Child |
09916420 |
Jul 2001 |
US |