Rolling bearing unit for supporting vehicle wheel

• US 6,524,011 B2
• Filed: 07/27/2001
• Issued: 02/25/2003
• Est. Priority Date: 01/17/1997
• Status: Expired due to Term

• Current Assignee: NSK Limited
• Original Assignee: NSK Limited
• Inventors: Miyazaki, Hiroya, Sawai, Hiroyuki, Ouchi, Hideo, Ohnuki, Yoshihisa, Kuwano, Takafumi
• Primary Examiner(s): Bucci, David A.
• Assistant Examiner(s): HANSEN, COLBY M
• Application Number:
  US09/916,420
• Publication Number:
  US 20010046339A1
• Time in Patent Office: 578 Days
• Field of Search: 384/544, 384/537, 384/585, 384/513, 384/625, 384/912, 384/913, 301/105.1, 301/124.1, 301/131, 301/108.1, 298/980.63, 298/980.66
• US Class Current: 384/544
• CPC Class Codes: B21J 9/025 with rolling or wobbling dies
• CPC Class Codes: B21K 25/00 Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components uniting by interference- or press-fitting B23P11/02, B21K19/02
• CPC Class Codes: B60B 27/00 Hubs non-metallic B60B5/00; of high resiliency B60B9/00
• CPC Class Codes: B60B 27/0005 with ball bearings
• CPC Class Codes: B60B 27/0026 of the radial type, e.g. splined key
• CPC Class Codes: B60B 27/0084 caulking to fix inner race
• CPC Class Codes: B60B 27/0094 one or more of the bearing races are formed by the hub
• CPC Class Codes: F16C 19/185 with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
• CPC Class Codes: F16C 19/186 with three raceways provided integrally on parts other than race rings, e.g. third generation hubs
• CPC Class Codes: F16C 2326/02 Wheel hubs or castors
• CPC Class Codes: F16C 33/30 Parts of ball or roller bearings
• CPC Class Codes: F16C 33/62 Selection of substances
• CPC Class Codes: F16C 35/063 Fixing them on the shaft with interposition of an element F16C35/07
• CPC Class Codes: F16C 43/04 Assembling rolling-contact bearings
• CPC Class Codes: Y10T 29/49684 with race making

Abstract

A bearing unit for vehicle wheel support comprising a shaft having a mounting flange for vehicle wheel or suspension apparatus, a step portion formed on one end portion thereof, a first inner ring raceway directly formed thereon, and a crimped portion formed on the end side of the step portion, and an inner ring fitted onto the step portion and having a second inner ring raceway thereon, the shaft being quench hardened at least at the first inner ring raceway with the crimped portion kept as formed and without quench hardened, and the inner ring being fixed to the shaft by the crimped portion of the shaft.

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 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.