Method for producing a piston

Patent metadata

Field	Value
Publication number	US-10359001-B2
Application number	US-201615297109-A
Country	US
Kind code	B2
Filing date	Oct 18, 2016
Priority date	Oct 19, 2015
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

A method for producing a piston of an internal combustion engine, with a cooling duct, may include producing a piston blank with a cooling duct, closing an inlet and an outlet of the cooling duct by at least one closure element, machine-finishing the piston blank, and removing the at least one closure element.

First claim

The invention claimed is:

1. A method for producing a piston of an internal combustion engine, with a cooling duct, comprising:
producing a piston blank with a cooling duct,
closing an inlet and an outlet of the cooling duct by at least one closure element to seal the cooling duct,
machine-finishing the piston blank, and
removing the at least one closure element to complete the piston.

2. The method according to claim 1 , wherein producing the piston blank includes casting the piston blank.

3. The method according to claim 2 , further comprising, prior to casting the piston blank, securing a releasable casting core as a negative contour for the cooling duct in a casting mould.

4. The method according to claim 3 , further comprising, prior to closing the inlet and the outlet of the cooling duct or after removing the at least one closure element, dissolving the releasable casting core.

5. The method according to claim 1 , wherein at least one of:
producing the piston blank includes assembling the piston blank from a cast piston upper part and a cast piston lower part, during which the cooling duct is formed,
the inlet and the outlet are arranged in the cast piston lower part, and
a cooling duct cover is provided in which the inlet and the outlet are arranged.

6. The method according to claim 1 , wherein:
producing the piston blank includes assembling from a forged piston upper part and a forged piston lower part, during which the cooling duct is formed,
the forged piston upper part and the forged piston lower part are welded to each other, and
the inlet and the outlet are provided in one of the forged piston lower part or in a cooling duct cover.

7. The method according to claim 1 , wherein the at least one closure element is one of a swellable round pin composed of a natural sponge material, a cotton wool pin, and a swellable plastic pin.

8. The method according to claim 1 , wherein one of:
the at least one closure element is one of a cork plug and a wooden pin, or
the at least one closure element is formed from a plastic adhesive.

9. A piston for an internal combustion engine produced by a process comprising:
producing a piston blank with a cooling duct,
closing an inlet and an outlet of the cooling duct by at least one closure element to seal the cooling duct,
machine-finishing the piston blank, and
removing the at least one closure element to complete the piston.

10. The piston according to claim 9 , wherein producing the piston blank includes casting the piston blank.

11. The piston according to claim 10 , further comprising, prior to casting the piston blank, securing a releasable casting core as a negative contour for the cooling duct in a casting mould.

12. The piston according to claim 11 , further comprising, prior to closing the inlet and the outlet of the cooling duct or after removing the at least one closure element, dissolving the releasable casting core.

13. The piston according to claim 9 , wherein at least one of:
producing the piston blank includes assembling the piston blank from a cast piston upper part and a cast piston lower part, during which the cooling duct is formed,
the inlet and the outlet are arranged in the cast piston lower part, and
a cooling duct cover is provided in which the inlet and the outlet are arranged.

14. The piston according to claim 9 , wherein:
producing the piston blank includes assembling from a forged piston upper part and a forged piston lower part, during which the cooling duct is formed,
the forged piston upper part and the forged piston lower part are welded to each other, and
the inlet and the outlet are provided in one of the forged piston lower part or in a cooling duct cover.

15. The piston according to claim 9 , wherein one of:
the at least one closure element is designed as one of a swellable round pin composed of a natural sponge material, as a cotton wool pin, and as a swellable plastic pin,
the at least one closure element is one of a cork plug or a wood pin, or
the at least one closure element is designed as a plug formed from a plastic adhesive.

16. The method according to claim 3 , wherein the releasable casting core is one of a sand core and a salt core.

17. The method according to claim 4 , dissolving the releasable casting core includes rinsing the releasable casting core out of the cooling duct.

18. The method according to claim 2 , wherein the at least one closure element is one of a swellable round pin composed of a natural sponge material, a cotton wool pin, and a swellable plastic pin.

19. The method according to claim 2 , wherein one of:
the at least one closure element is one of a cork plug and a wooden pin, or
the at least one closure element is formed from a plastic adhesive.

20. A method for producing a piston of an internal combustion engine, with a cooling duct, comprising:
producing a piston blank with a cooling duct,
closing an inlet and an outlet of the cooling duct by at least one closure element,
machine-finishing the piston blank, and
removing the at least one closure element;
wherein the at least one closure element is one of a swellable round pin composed of a natural sponge material, a cotton wool pin, and a swellable plastic pin.

Assignees

• Mahle Int Gmbh

Inventors

• Pfizenmaier Lothar
• Mueller Reiner

Classifications

• B21K1/185

  with cooling channels · CPC title

• B22D29/002 Primary

  by leaching, washing or dissolving · CPC title

• F02F2003/0061

  by welding · CPC title

• B23K31/02

  relating to soldering or welding · CPC title

• B22C9/24

  for hollow articles · CPC title