Controlled cooling apparatus for torque transfer devices

A torque transfer device comprising:

• a reaction plate:
• a piston assembly;
• a plurality of first, apply torque plates;
• a plurality of second, reaction torque plates;
• each said first and second torque plates having a generally flat, annular disk portion:
• said disk portions on said first and second torque plates being interleaved;
• passage means penetrating said disk portions;
• an annular friction disk interposed between the disk portion of each said first and second interleaved torque plates:
• an obverse engaging surface on each said friction disk operatively to engage said disk portion of the torque plate successively adjacent to the torque plate to which said friction disk is secured;
• an annular channel means in said obverse engaging face of said friction disks;
• aperture means penetrating each said friction disk;
• said passage means in said disk portion of said first and second torque plates being disposed in register with each other and with said aperture means penetrating said friction disks:
• said annular channel means is approximately twice as far from said radially outer edge as it is from said radially inner edge;
• said friction disks have between fifteen and thirty circumferentially spaced, radially extending recesses;
• said piston assembly having a head portion selectively to compress said interleaved torque plates against said reaction plate;
• an annular groove in said head portion;
• said annular groove being disposed to communicate with said channel in a contiguously juxtaposed friction disk.