Bearing unit raceway ring member, bearing unit, and method and apparatus for manufacturing bearing unit raceway ring member

• Main Authors: YASUDA, YUU, WAKABAYASHI, TATSUO, NAGANO, MASATO, NAGAI, KENICHI, OOTSUKA, KIYOSHI, KOBAYASHI, KAZUTO
• Format: Patent
• Language: English; French; German
• Published: 10.06.2015
• Subjects: AXLES FOR WHEELS OR CASTORS; BEARINGS; BLASTING; CASTORS; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; FORGE FURNACES; FORGING; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HAMMERING; HEATING; INCREASING WHEEL ADHESION; LIGHTING; MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS; MECHANICAL ENGINEERING; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PRESSING METAL; PUNCHING METAL; RIVETING; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; TRANSPORTING; VEHICLE WHEELS; VEHICLES IN GENERAL; WEAPONS

The present relates to a bearing unit comprising a first raceway ring (2) which is mounted on a vehicle body; a second raceway ring (4) which is disposed to face the first raceway ring (2) and is mounted on a wheel; and a plurality of rolling elements (6, 8) which are disposed rollably between raceway surfaces (2s, 4s) which are formed, respectively, on facing surfaces (2n, 4m) of the first and second raceway rings (2, 4), wherein the second raceway ring (4) has a raceway ring member (12) which has a radially projecting flange (12a); and an inner ring (16) which is clamped to an axial end portion (12c) of the raceway ring member (12) so as to be locked on the raceway ring member (12), the flange (12a) is formed monolithically with the raceway ring member (12) by performing a cold forging on a material (20) made of machine structural carbon steel without performing an annealing after the forging, and a hardness of a root portion of the flange (12a) is set higher than a hardness of the axial end portion (12c) of the raceway ring member (12) before clamping.