Double wall bearing cup

A bearing cup adapted for positioning in a housing formed from a material having a first coefficient of thermal expansion, the bearing cup comprising:

• an inner bearing cup having an inner surface which forms a rolling element raceway, said inner bearing cup having a corresponding length;
• and
• an outer bearing cup disposed about and continuous with the periphery of said inner bearing cup, said outer bearing cup having a corresponding length which is longer than the length of said inner bearing cup to form a lip, whereby the lip of said outer bearing cup may be formed to retain rolling elements within the bearing cup;
• said outer bearing cup being formed of a material having a second coefficient of thermal expansion and the inner cup being formed of a material having a third coefficient of thermal expansion, the difference between the first and second coefficients of thermal expansion being less than the difference between the first and third coefficients of thermal expansion and wherein said inner bearing cup is formed of a high carbon steel and said outer bearing cup is formed of a lower carbon steel.

A bearing cup adapted for positioning in a housing formed from a material having a first coefficient of thermal expansion, the bearing cup comprising:

• an inner bearing cup having an inner surface which forms a rolling element raceway, said inner bearing cup having a corresponding length;
• and
• an outer bearing cup disposed about and continuous with the periphery of said inner bearing cup, said outer bearing cup having a corresponding length which is longer than the length of said inner bearing cup to form a lip, whereby the lip of said outer bearing cup may be formed to retain rolling elements within the bearing cup;
• said outer bearing cup being formed of a material having a second coefficient of thermal expansion and the inner cup being formed of a material having a third coefficient of thermal expansion, the difference between to first and second coefficients of thermal expansion being less than the difference between the first and third coefficients of thermal expansion and wherein each of said inner bearing cup and said outer bearing cup comprises:
• a bottom portion;
• and
• a continuous sidewall portion extending from said bottom portion, the sidewall portion of said outer bearing cup being thinner than the sidewall portion of said inner bearing cup.