PISTON FOR AN INTERNAL COMBUSTION ENGINE

• US 20130098316A1
• Filed: 10/24/2011
• Published: 04/25/2013
• Est. Priority Date: 10/24/2011
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Stan, Sorin, Lapp, Michael T., Cimbalik, Tony D.
• Granted Patent: US 8,739,755 B2
• Time in Patent Office: Days
• US Class Current: 123/41.35
• CPC Class Codes: F02F 2003/0061 by welding
• CPC Class Codes: F02F 3/003 the parts being connected by casting, brazing, welding or clamping
• CPC Class Codes: F02F 3/22 the fluid being liquid

Abstract

Exemplary pistons are disclosed, e.g., for an internal combustion engine. An exemplary piston includes a lower part and an upper part, whereby the lower part and the upper part define a circumferential closed cooling gallery. The cooling gallery may be provided with a gallery bottom. The piston may further include a circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the bar.

Claims

1. A piston for an internal combustion engine, comprising

a lower part;

an upper part, wherein the lower part and the upper part cooperate to define at least a portion of a generally closed circumferential cooling gallery, the cooling gallery being defined in part by a gallery bottom; and

a circumferential bar positioned on the gallery bottom, the circumferential bar defining at least one coolant inlet and at least one coolant outlet extending through the gallery bottom.

2. The piston according to claim 1, wherein the bar is formed integrally with the gallery bottom.

3. The piston according to claim 1, wherein the bar is formed as a separate part which is connected with the gallery bottom.

4. The piston according to claim 1, wherein the bar is positioned on the gallery bottom off-center with respect to a width of the gallery bottom.

5. The piston according to claim 1, wherein the bar is offset radially outwards with respect to a central axis of the piston.

6. The piston according to claim 1, wherein a first diameter of at least one coolant inlet is smaller than a second diameter of at least one coolant outlet.

7. The piston according to claim 1, wherein a single coolant inlet and a single coolant outlet are provided.

8. The piston according to claim 7, wherein the single coolant inlet and single coolant outlet are positioned diametrically opposite each other.

9. The piston according to claim 1, wherein the circumferential bar extends about substantially an entire periphery of the piston.

10. The piston according to claim 1, wherein the at least one coolant outlet includes two coolant outlets, the two coolant outlets extending away from a single coolant inlet to define a generally V-shaped passage.

11. The piston according to claim 1, wherein the coolant outlet is positioned relative to an associated coolant inlet to form an angled passage extending into the cooling gallery.

12. The piston according to claim 1, wherein the circumferential bar defines opposing rounded portions

14. The piston according to claim 12, wherein the bar is formed integrally with the gallery bottom.

15. The piston according to claim 12, characterized in that the bar is formed as a separate part, which is connected with the gallery bottom.

16. The piston according to claim 2, wherein the bar is positioned on the gallery bottom off-center with respect to a width of the gallery bottom.

17. The piston according to claim 15, wherein the bar is offset radially outwards with respect to a central axis of the piston.

18. The piston according to claim 12, wherein a first diameter of the at least one coolant inlet is smaller than a second diameter of the at least one coolant outlet.

19. The piston according to claim 2, wherein the single coolant inlet and single coolant outlet are positioned diametrically opposite each other.

20. The piston according to claim 12, wherein the circumferential bar extends about substantially an entire periphery of the piston.

13. A piston for an internal combustion engine, comprising:

a piston head, including a piston crown, a circumferential top land, and a circumferential ring-receiving part; and

a piston skirt, including piston pin bosses defining pin bores, the piston pin bosses being connected by bearing surfaces, the skirt cooperating with the piston head to define a circumferential closed cooling gallery adjacent the ring-receiving part, the cooling gallery including a gallery bottom;

wherein the piston includes a lower part and an upper part, both cooperating to at least partially form the cooling gallery, the lower part forming at least the gallery bottom of the cooling gallery; and

wherein a circumferential bar is arranged on the gallery bottom, at least one coolant inlet and at least one coolant outlet being defined by the circumferential bar, each of the at least one coolant inlet and at least one coolant outlet extending through the gallery bottom.