Piston for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-8939114-B2
Application number	US-201213540777-A
Country	US
Kind code	B2
Filing date	Jul 3, 2012
Priority date	Jul 4, 2011
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

The present invention relates to a piston ( 10 ) for an internal combustion engine, having a piston head ( 11 ) having a piston crown ( 17 ), an outer circumferential cooling channel ( 21 ), an inner cooling space ( 22 ) disposed in the region of the underside ( 17 a ) of the piston crown ( 17 ), which is closed off with a separate closure element ( 23 ) that has at least one outflow opening ( 25 ) for cooling oil. According to the invention, it is provided that the closure element ( 23 ) and the inner cooling space ( 22 ) extend all the way to below the outer circumferential cooling channel ( 21 ).

First claim

The invention claimed is:

1. A piston for an internal combustion engine, comprising:
a piston head ( 11 ) having a piston crown ( 17 ), a ring belt, an outer circumferential cooling channel ( 21 ), an inner cooling space ( 22 ) disposed in the region of the underside ( 17 a ) of the piston crown ( 17 ),
a piston skirt ( 12 ) having inner skirt walls ( 12 a ), pin bosses ( 16 ) that are connected with the underside ( 17 a ) of the piston crown ( 17 ) by way of pin boss connections ( 18 ), and having pin bores ( 19 ),
wherein the inner cooling space ( 22 ) is closed off with a separate closure element ( 23 ) configured as a separate component fixed to the underside ( 17 a ) of the piston crown ( 17 ) below the outer circumferential cooling channel, said separate closure element having at least one outflow opening ( 25 ) and at least one inflow opening for cooling oil, and wherein the closure element ( 23 ) and the inner cooling space ( 22 ) extend all the way to the inner skirt walls of the piston skirt, below the outer circumferential cooling channel ( 21 ).

2. The piston according to claim 1 , wherein the at least one outflow opening ( 25 ) for cooling oil is configured by means of a gap provided between the inner skirt walls of the piston ( 10 ) and an edge of the closure element ( 23 ).

3. The piston according to claim 1 , wherein the at least one outflow opening ( 25 ) is formed by a bore provided in the closure element ( 23 ).

4. The piston according to claim 1 , wherein a conducting pipe ( 127 ) for cooling oil is provided in the at least one inflow opening ( 126 ).

5. The piston according to claim 1 , wherein the outer circumferential cooling channel ( 21 ) is configured to be closed.

6. The piston according to claim 1 , wherein the closure element ( 23 ) is connected with the piston ( 10 ) by means of welding.

7. The piston according to claim 6 , wherein the closure element ( 23 ) has at least two contact locations ( 24 ) that serve as weld points.

8. The piston according to claim 7 , wherein the contact locations ( 24 ) are configured as spacers between the closure element ( 23 ) and the underside ( 17 a) of the piston crown ( 17 ).

9. The piston according to claim 1 , wherein the closure element ( 23 ) is produced from a steel spring sheet.

10. The piston according to claim 1 , wherein the piston is configured as a sodium-cooled piston ( 10 ) having a closed outer circumferential cooling channel ( 21 ).

Assignees

• Keller Klaus
• Mahle Int Gmbh

Inventors

• Keller Klaus

Classifications

• F02F3/22 Primary

  the fluid being liquid · CPC title