Cooling duct piston for an internal combustion engine comprising heat pipes
AssigneeMahle International GmbH
InventorsPeter Heidrich, Roland Lochmann, Timo Estrum
Life of this patent
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Abstract
The invention relates to a cooling duct piston for an internal combustion engine comprising heat pipes. In order to improve dissipation of heat from the thermally loaded piston areas while preventing thermal tensions, liquid-filled heat pipes that are provided with an evaporator end and a condenser end are disposed in bores of the cooling duct which are oriented towards the bottom of the piston. The heat pipes are arranged such that the evaporator ends terminate at the end of the bores which faces the piston bottom while the condenser ends terminate in the closed cooling duct.
Claims8
A cooling channel piston for an internal combustion engine, comprising:
- a piston head forged from steel, said piston head comprising:
- (a) a combustion bowl in a piston crown;
- (b) a ring wall with ring belt;
- and
- (c) a cooling channel that runs on a circumference of the piston head at a height of the ring belt and having a plurality of bores distributed over a circumference of the cooling channel, said bores being directed towards the piston crown;
- a cover for closing off the cooling channel;
- pin bosses suspended on the piston head;
- a piston skirt connected with the pin bosses;
- and
- liquid-filled heat pipes, each pipe having an evaporator side and condenser side, said pipes being disposed in the bores of the cooling channel,
- wherein the evaporator sides of the heat pipes end at a piston-crown-side end of the bores, and the condenser sides of the heat pipes end in the cooling channel, and wherein the bores have a bore depth (BT) that ends before the piston crown, so that a wall ridge of piston material exists between the evaporator sides of the heat pipes and the piston crown.
Dependencies are inferred from the claim text.