Friction plate with pressed core plates

A friction plate, comprising:

• a ring-shaped piece of friction material with an inner circumference, and first and second surfaces facing in first and second opposite axial directions, respectively;
• a first core plate with a first ring-shaped body, a first plurality of protrusions extending radially outward from the first ring-shaped body and tilted in a first circumferential direction, and a second plurality of protrusions extending radially inward from the first ring-shaped body;
• and,
• a second core plate with a second ring-shaped body, a third plurality of protrusions extending radially outward from the second ring-shaped body and tilted in a second circumferential direction, opposite the first circumferential direction, and a fourth plurality of protrusions extending radially inward from the second ring-shaped body, wherein:
• the first and third pluralities of protrusions are imbedded in the first and second surfaces, respectively;
• the first and second bodies are disposed at least partially radially inward of the inner circumference;
• and,
• the second and fourth pluralities of protrusions are aligned in an axial direction and are for engagement with a rotatable element.

A friction plate, comprising:

• a ring-shaped piece of friction material with inner and outer circumferences, and first and second surfaces facing in first and second opposite axial directions, respectively;
• a first core plate with:
• a first ring-shaped body;
• a first plurality of protrusions embedded in the first surface, extending radially outward from the first ring-shaped body, and tilted in a first circumferential direction;
• and a second plurality of protrusions extending radially inward from the first ring-shaped body;
• a second core plate with:
• a second ring-shaped body;
• a third plurality of protrusions embedded in the second surface, extending radially outward from the second ring-shaped body, and tilted in a second circumferential direction, opposite the first circumferential direction;
• and a fourth plurality of protrusions extending radially inward from the second ring-shaped body;
• a first plurality of grooves in the first surface, connecting the inner and outer circumferences, and at least partially formed by the first plurality of protrusions;
• and,
• a second plurality of grooves in the second surface, connecting the inner and outer circumferences, and at least partially formed by the third plurality of protrusions, wherein:
• the first and second bodies are at least partially disposed radially inward of the inner circumference;
• and,
• the second and fourth pluralities of protrusions are aligned in a axial direction and are for engagement with a rotatable element.