# US 11,905,912 B2 · Piston of an internal combustion engine

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- Number: US 11,905,912 B2
- Document ID: US11905912B2
- Status: Granted
- Kind: B2
- Application number: 16/500,813
- Filed: 2018-03-26
- Published: 2022-09-29
- Granted: 2024-02-20
- Earliest claimed: 2017-04-04
- Assignees: Mahle International GmbH
- Applicants: Mahle International GmbH
- Inventors: Frank-Peter Jung; Philipp Licht; Rainer Scharp
- Web page: https://patentgrep.com/patent/US11905912B2

## CPC

- F02F 3/22: the fluid being liquid
- F16J 1/09: with means for guiding fluids (F16J1/08 takes precedence)
- F02F 2003/0061: {by welding}
- F05C 2201/0448: Steel
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES

## Abstract

A piston of an internal combustion engine is disclosed. The piston includes a piston head with a piston bowl, a ring part and an annular cooling channel arranged between the ring part and the piston bowl. A closure element is provided to close the cooling channel in a direction away from the piston bowl. At least one guiding element is arranged in the cooling channel. The at least one guiding element provides a lug facing in a direction of an inner cooling channel wall and disposed at least partially circumferentially. The lug of the at least one guiding element is structured and arranged to direct cooling oil present in the cooling channel towards an upper region of the inner cooling channel wall relative to the closure element to facilitate cooling the upper region.

## Claims

### Claim 1

A piston of an internal combustion engine, comprising:
a piston head including a piston bowl, a ring part and an annular cooling channel arranged between the ring part and the piston bowl, wherein the cooling channel is closed in a direction away from the piston bowl by a closure element;
at least one guiding element arranged in the cooling channel, the at least one guiding element providing a lug facing in a direction of an inner cooling channel wall and disposed at least partially circumferentially, wherein the lug of the at least one guiding element is structured and arranged to direct cooling oil present in the cooling channel towards an upper region of the inner cooling channel wall relative to the closure element to facilitate cooling the upper region;
wherein the at least one guiding element is clamped and held between an underside of the ring part and the closure element; and
wherein the at least one guiding element has a lower flange extending radially and circumferentially between the underside of the ring part and the closure element, the lower flange extending circumferentially around the at least one guiding element.

### Claim 2 (depends on 1)

The piston as claimed in claim 1, wherein the at least one guiding element provides a wall inclined in relation to a piston axis, and wherein the wall together with an outer cooling channel wall defines a funnel-shaped cross section and in a lower region has outlet openings for cooling oil, the lower region disposed between the lug and the closure element.

### Claim 3 (depends on 1)

The piston as claimed in claim 1, wherein the at least one guiding element is composed of a steel sheet or a plastic.

### Claim 4

An internal combustion engine, comprising:
at least one piston including:
a piston head including a piston bowl, a ring part and an annular cooling channel arranged between the ring part and the piston bowl;
a closure element structured and arranged to close the cooling channel in a direction away from the piston bowl; and
at least one guiding element arranged in the cooling channel, the at least one guiding element providing a lug facing in a direction of an inner cooling channel wall and disposed at least partially circumferentially, wherein the lug of the at least one guiding element is structured and arranged to direct cooling oil present in the cooling channel towards an upper region of the inner cooling channel wall relative to the closure element to facilitate cooling the upper region;
wherein the at least one guiding element has a lower flange extending radially and circumferentially around the at least one guiding element, the lower flange being clamped and held between an underside of the ring part and the closure element.

### Claim 5 (depends on 4)

The internal combustion engine as claimed in claim 4, wherein the at least one guiding element provides a wall inclined in relation to a piston axis, and wherein the wall together with an outer cooling channel wall of the cooling channel defines a funnel-shaped cross section and has at least one outlet opening for cooling oil in a lower region between the lug and the closure element.

### Claim 6 (depends on 4)

The internal combustion engine as claimed in claim 4, wherein the at least one guiding element has at least one slot extending axially along a lower region of the at least one guiding element, the lower region disposed between the lug and the lower flange.

### Claim 7

A piston of an internal combustion engine, comprising:
a piston head including a piston bowl, a ring part and an annular cooling channel arranged between the ring part and the piston bowl;
a closure element structured and arranged to close the cooling channel in a direction away from the piston bowl;
at least one guiding element arranged in the cooling channel, the at least one guiding element providing a lug facing in a direction of an inner cooling channel wall and disposed at least partially circumferentially, wherein the lug of the at least one guiding element is structured and arranged to direct cooling oil present in the cooling channel towards an upper region of the inner cooling channel wall relative to the closure element to facilitate cooling the upper region;
wherein the at least one guiding element provides a wall inclined in relation to a piston axis; and
wherein the at least one guiding element is clamped and held between an underside of the ring part and the closure element; and
wherein the at least one guiding element has at least one slot extending axially along a lower region of the at least one guiding element, the lower region disposed between the lug and the closure element.