US 11,686,348 B2
Bearing unit made of low carbon steel
Fausto Baracca, Massa (IT); Ettore Bertelloni, Massa (IT); and Fabio Cavacece, Rome (IT)
Assigned to Aktiebolaget SKF, (SE)
Filed by AKTIEBOLAGET SKF, Gothenburg (SE)
Filed on Nov. 2, 2021, as Appl. No. 17/516,842.
Claims priority of application No. 102020000026608 (IT), filed on Nov. 9, 2020.
Prior Publication US 2022/0145935 A1, May 12, 2022
Int. Cl. F16C 19/06 (2006.01); F16C 33/62 (2006.01); F16C 33/64 (2006.01); F16C 33/58 (2006.01)
CPC F16C 33/62 (2013.01) [F16C 33/58 (2013.01); F16C 33/64 (2013.01); F16C 19/06 (2013.01); F16C 2204/62 (2013.01); F16C 2204/64 (2013.01); F16C 2223/18 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A bearing unit comprising:
a radially outer ring comprising a radially outer raceway;
a radially inner ring comprising a radially inner raceway;
a row of rolling elements interposed between the radially outer ring and the radially inner ring;
an outer induction hardened central portion defined within the radially outer raceway; and
an inner induction hardened central portion defined within the radially inner raceway,
wherein both the radially outer ring and the radially inner ring are made of a carbon steel with a minimum percentage by weight of carbon equal to 0.42%;
wherein the outer induction hardened central portion comprises a hardness of between 55 HRC and 62 HRC over a depth SEmin of between 10% and 20% of a diameter (SΦ) of the rolling elements.