# US 2014/0190010 A1 · Process for producing a piston for an internal combustion engine and piston for an internal combustion engine

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- Number: US 2014/0190010 A1
- Document ID: US20140190010A1
- Status: Published application
- Kind: A1
- Application number: 14/008,652
- Filed: 2012-03-27
- Published: 2014-07-10
- Earliest claimed: 2011-03-30
- Assignees: Federal-Mogul Nurnberg GmbH
- Inventors: Arnd Baberg; Frank Thomas Hugo Dörnenburg; Klaus Lades
- Web page: https://patentgrep.com/patent/US20140190010A1

## CPC

- B23P 15/10: pistons
- F02F 3/16: having cooling means
- F02F 3/22: the fluid being liquid
- F16J 9/22: Rings for preventing wear of grooves or like seatings
- F02F 2200/06: Casting
- Y10T 29/49249: Piston making
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In a process for producing a piston for an internal combustion engine, a groove is worked into a cast piston blank proceeding from a combustion chamber cavity (20) in a largely radial direction and then closed to form a cooling duct. A cast piston for an internal combustion engine has a closure which is fitted after the casting and the machining between the cooling duct and a combustion chamber cavity (20).

## Claims

### Claim 1

A method for producing a piston (10) for an internal combustion engine, in which a groove is worked into a cast piston blank, proceeding from a combustion chamber cavity (20), in a largely radial direction and is subsequently closed to form a cooling channel (16).

### Claim 2 (depends on 1)

The method according to claim 1,
characterized in that
the groove is closed by means of a metal sheet (18).

### Claim 3 (depends on 2)

The method according to claim 2,
characterized in that
the metal sheet (18) is remelted at least in areas.

### Claim 4

The method according to one of the preceding claims,
characterized in that further a radial groove is incorporated, proceeding from the outer side of the piston (10), and filled with material (14), and an annular groove (12) is worked out of this.

### Claim 5

A cast piston (10) for an internal combustion engine, which comprises between the cooling channel (16) and a combustion chamber cavity (20) a closure (18) attached after the casting and the processing.

### Claim 6 (depends on 5)

The piston according to claim 5,
characterized in that the closure is a metal sheet (18).

### Claim 7 (depends on 6)

The piston according to claim 6,
characterized in that
the metal sheet (18) is remelted at least in areas.

### Claim 8 (depends on 5, 6, 7)

The piston according to one of claims 5 to 7,
characterized in that an annular groove (12) is provided which is formed in a material (14) that is filled into a groove formed from the outer side.