Patent ID: 8066605

Claim:
A planetary transmission comprising: a sun gear, the sun gear forming an input drive to the planetary transmission, a ring gear arranged around the sun gear, a planet carrier, the planet carrier being adapted to rotate and carrying at least one planet wheel, which planet wheel meshes with the sun gear and the ring gear, the planet carrier forming an output drive from the planetary transmission, and a wet disk brake comprising a first set of brake disks, the first set of brake disks being rotationally locked to the planet carrier and thereby in operation rotating at a rotational speed of the planet carrier, and a second set of brake disks, the second set of brake disks being displaceably arranged in a fixed housing, the first and second brake disks being arranged so that every other brake disk belongs to the first set of brake disks and every second brake disk belongs to the second set of brake disks, and means for circulation of cooling fluid through the brake rotationally locked to the sun gear so that it, in operation, rotates at a rotational speed of the sun gear.