# US 2014/0190443 A1 · Piston for an internal combustion engine and method for its production

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0190443 A1
- Document ID: US20140190443A1
- Status: Published application
- Kind: A1
- Application number: 14/195,921
- Filed: 2014-03-04
- Published: 2014-07-10
- Earliest claimed: 2011-03-04
- Assignees: Mahle International GmbH
- Applicants: MAHLE International GmbH
- Inventors: Helmut EDEL; Andreas SEEGER-VAN NIE; Volker WEISSE; Achim FEDYNA; Christian PESCHKE; Rainer SCHARP
- Web page: https://patentgrep.com/patent/US20140190443A1

## CPC

- F02F 3/00: Pistons
- F02F 3/003: {the parts being connected by casting, brazing, welding or clamping}
- F02F 3/22: the fluid being liquid
- F02F 2003/0061: {by welding}
- F05C 2201/021: Aluminium
- F05C 2201/0448: Steel
- Y10T 29/49252: Multi-element piston making
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A piston for an internal combustion engine, having a piston base body, a piston ring element having at least an inner region of a piston crown, and a piston skirt. The piston is provided with pin bosses having pin bores and the ring element has at least an outer region of a piston crown having a circumferential top land and a circumferential ring belt provided with ring grooves. The piston base body and piston ring element are joined together by way of corresponding, conical joining surfaces configured on them.

## Claims

### Claim 1

A piston for an internal combustion engine, having a piston base body and a piston ring element, whereby the piston base body has at least an inner region of a piston crown as well as a piston skirt, which is provided with pin bosses having pin bores, whereby the piston ring element has at least an outer region of a piston crown having a circumferential top land, and a circumferential ring belt provided with ring grooves, wherein the piston crown has a combustion chamber bowl, wherein the piston base body and piston ring element jointly form a circumferential cooling channel, wherein piston base body and piston ring element are joined together by way of corresponding, conical inner and outer joining surfaces configured on them, wherein the outer joining surface of the piston ring element is located below the ring belt, wherein the inner joining surface of the piston base body encloses the inner region of the piston crown, wherein the inner joining surfaces form an acute angle α relative to a vertical piston axis, wherein the outer joining surfaces form an acute angle β relative to said vertical piston axis, and wherein β is larger than α.

### Claim 2 (depends on 1)

The piston according to claim 1, wherein at least one of the piston base body and the piston ring element has a locally thickened part in the region of ends of the joining surfaces on a cooling channel side.

### Claim 3 (depends on 1)

The piston according to claim 1, wherein the combustion chamber bowl has a bowl edge composed of a wear-resistant and/or temperature-resistant material.

### Claim 4 (depends on 1)

The piston according to claim 1, wherein the piston base body is produced from a metallic material, and the piston ring element is produced from a wear-resistant and/or temperature-resistant material.

### Claim 5

A piston for an internal combustion engine, having a piston base body and a piston ring element, whereby the piston base body has at least an inner region of a piston crown as well as a piston skirt, the piston skirt being provided with pin bosses having pin bores,
wherein the piston ring element has at least an outer region of a piston crown having a circumferential top land, and a circumferential ring belt provided with ring grooves,
wherein the piston crown has a combustion chamber bowl,
wherein the piston base body and piston ring element jointly form a circumferential cooling channel,
wherein the piston base body and piston ring element are joined together by way of corresponding, conical inner and outer joining surfaces configured on them,
wherein the outer joining surface of the piston ring element is located within the ring belt, wherein the inner joining surface of the piston base body encloses the inner region of the piston crown, whereby the inner joining surfaces form an acute angle α relative to a vertical piston axis and wherein the outer joining surfaces form an obtuse angle β′ relative to said vertical piston axis.

### Claim 6 (depends on 5)

The piston according to claim 5, wherein at least one of the piston base body and the piston ring element has a locally thickened part in a region of ends of the joining surfaces on a cooling channel side.

### Claim 7 (depends on 5)

The piston according to claim 5, wherein the combustion chamber bowl has a bowl edge composed of a wear-resistant and/or temperature-resistant material.

### Claim 8 (depends on 5)

The piston according to claim 5, wherein the piston base body is produced from a metallic material, and the piston ring element is produced from a wear-resistant and/or temperature-resistant material.