Patent ID: 8863542

Claim:
A heat sink for cooling cylindrical electrical elements each having a circular end face, the heat sink comprising: a heat-conducting plate having first and second sides, a single coolant inlet, a single coolant outlet, and a first plurality of bores arranged on the first side of the heat-conducting plate, each of the first plurality of bores being configured to receive a cylindrical end portion of one of the cylindrical electrical elements, the first plurality of bores each including an axis of symmetry and a bore bottom wall; at least one serpentine channel formed in the plate running past multiple ones of the first plurality of bores in a plane perpendicular to said axes of symmetry, the serpentine channel including curved portions following the curvature of the bores, wherein the at least one serpentine channel runs uninterrupted from the coolant inlet to the coolant outlet, and wherein the coolant inlet, the coolant outlet and the entire at least one serpentine channel are formed in the first side of the heat-conducting plate.