Method of making a piston oil gallery using a hollow metallic core
AssigneeGM Global Technology Operations LLC
InventorsJoseph C. Kopchick, Qigui Wang
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Abstract
A method of making an aluminum piston is described. In one embodiment, the method includes placing a oil gallery core in a mold, the oil gallery core comprising a metal tube connected to a hollow inlet tube and a hollow outlet tube; introducing liquid aluminum into the mold around the oil gallery core; and allowing the liquid aluminum to solidify, the oil gallery core forming a channel in the piston. Aluminum pistons are also described.
Claims20
A method of making an aluminum piston without the use of a dissolvable salt core, the method comprising:
- placing an oil gallery core in a mold;
- introducing liquid aluminum into the mold around the oil gallery core such that no dissolvable salt core is present in the mold;
- connecting the inlet tube to a supply of water;
- and
- allowing the liquid aluminum to solidify, the oil gallery core forming a channel in the piston, wherein:
- the oil gallery core comprises a metal tube connected to a hollow inlet tube and a hollow outlet tube;
- the metal tube comprises a variable cross-section along substantially the entire length of the metal tube such that the metal tube has a relatively larger diameter where the inlet tube and outlet tube are connected, and a relatively smaller diameter between where the inlet tube and outlet tube are connected to the metal tube;
- and
- the inlet tube and the outlet tube are connected to the supply of water and a water outlet respectively with adaptors, each adaptor having a seal formed between the adaptor and the inlet tube or outlet tube.
A method of making an aluminum piston without the use of a dissolvable salt core, the method comprising:
- placing an oil gallery core in a mold;
- connecting the inlet tube to a supply of water;
- introducing liquid aluminum into the mold around the oil gallery core;
- allowing the liquid aluminum to solidify;
- and
- pumping water through the oil gallery core while the liquid aluminum is solidifying, the oil gallery core forming a channel in the piston, wherein:
- the oil gallery core comprises a metal tube connected to a hollow inlet tube and a hollow outlet tube;
- the metal tube comprises a variable cross-section along substantially the entire length of the metal tube such that the metal tube has a relatively larger diameter where the inlet tube and outlet tube are connected, and a relatively smaller diameter between where the inlet tube and outlet tube are connected to the metal tube;
- and
- the inlet tube and the outlet tube are connected to the supply of water and a water outlet respectively with adaptors, each adaptor having a seal formed between the adaptor and the inlet tube or outlet tube.
A method of making an aluminum piston without the use of a dissolvable salt core, the method comprising:
- placing an oil gallery core in a mold;
- introducing liquid aluminum into the mold around the oil gallery core such that no dissolvable salt core is present in the mold;
- and
- allowing the liquid aluminum to solidify, the oil gallery core forming a channel in the piston, wherein:
- the oil gallery core comprises a metal tube connected to a hollow inlet tube and a hollow outlet tube;
- the metal tube comprises a deflector where the inlet tube and outlet tube are connected;
- the metal tube comprises a variable cross-section along substantially the entire length of the metal tube such that the metal tube has a relatively larger diameter where the inlet tube and outlet tube are connected, and a relatively smaller diameter between where the inlet tube and outlet tube are connected to the metal tube;
- and
- the inlet tube and the outlet tube are connected to a supply of water and a water outlet respectively with adaptors, each adaptor having a seal formed between the adaptor and the inlet tube or outlet tube.
Dependencies are inferred from the claim text.