Bearing cage and roller bearing including the cage

A bearing cage for a roller bearing comprising:

• a first ring element axially spaced from a second ring element, and
• a plurality of bridges extending from the first ring element to the second ring element and defining with the first ring element and the second ring element a plurality of pockets each configured to receive a roller element,
• wherein each of the bridges has a radial thickness,
• wherein each of the bridges has a first circumferential side face and a second circumferential side face,
• wherein at least a portion of each first circumferential side face is configured to form a first contact surface for one of the roller elements and at least a portion of each second circumferential side face is configured to form a second contact surface for the one of the roller elements,
• wherein each of the first contact surfaces and the second contact surfaces has an embossing depth
• between 60% and 85% of the radial thickness.

A bearing cage for a roller bearing comprising:

• a first ring element axially spaced from a second ring element, and
• a plurality of bridges extending from the first ring element to the second ring element and defining with the first ring element and the second ring element a plurality of pockets each configured to receive a roller element,
• wherein each of the bridges has a radially inner surface, a radially outer surface and a radial thickness from the radially inner surface to the radial outer surface,
• wherein each of the bridges has a first circumferential side and a second circumferential side,
• wherein the first circumferential side of each of the bridges has a radially inner surface portion lying in a first plane and a radially outer circumferential surface lying in a second plane, the second plane intersecting the first plane along an first axial line,
• wherein the second circumferential side of each of the bridges has a radially inner surface portion lying in a third plane and a radially outer circumferential surface lying in a fourth plane, the third plane intersecting the fourth plane along a second axial line,
• wherein the first axial line and the second axial line are each located closer to the radially outer surface than to the radially inner surface, and
• wherein a radial width of the radially inner surface portion of the first circumferential side of each of the bridges is between 60% and 85% of the radial thickness.