PISTON FOR AN INTERNAL COMBUSTION ENGINE

• US 20140290618A1
• Filed: 07/04/2012
• Published: 10/02/2014
• Est. Priority Date: 07/05/2011
• Status: Active Grant

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Bischofberger, Ulrich
• Granted Patent: US 9,109,530 B2
• Time in Patent Office: Days
• US Class Current: 123/193.6
• CPC Class Codes: F01P 3/10 Cooling by flow of coolant through pistons
• CPC Class Codes: F02F 3/16 having cooling means
• CPC Class Codes: F02F 3/22 the fluid being liquid

Abstract

The invention relates to a piston (10, 110, 210) for an internal combustion engine, comprising a piston head (11, 111, 211) and a piston skirt, the piston head (11, 111, 211) having a circumferential ring section (15, 115, 215) and a circumferential cooling channel (16, 116, 216) in the region of the ring section (15, 115, 215). The cooling channel has a cooling channel floor (17, 117, 217) and a cooling channel ceiling (18, 118, 218). According to the invention, the cooling channel (16, 116, 216) has a narrowing (20, 120, 220).

Claims

1. Piston (10, 110, 210) for an internal combustion engine, having a piston head (11, 111, 211) and a piston skirt, wherein the piston head (11, 111, 211) has a circumferential ring belt (15, 115, 215) as well as a circumferential cooling channel (16, 116, 216) in the region of the ring belt (15, 115, 215), having a cooling channel floor (17, 117, 217) and a cooling channel ceiling (18, 118, 218), wherein the cooling channel (16, 116, 216) has a narrowing (20, 120, 220).

2. Piston according to claim 1, wherein the narrowing (20, 120, 220) has a distance from the cooling channel floor (17, 117, 217) that corresponds to at least one-third of the axial height of the cooling channel (20, 120, 220).

3. Piston according to claim 1, wherein the narrowing (20, 120, 220) has a distance from the cooling channel floor (17, 117, 217) that corresponds to at most two-thirds of the axial height of the cooling channel (20, 120, 220).

4. Piston according to claim 1, wherein the narrowing (20, 120, 220) has essentially the same distance (A) from the cooling channel floor (17, 117, 217) and from the cooling channel ceiling (18, 118, 218).

5. Piston according to claim 1, wherein the narrowing (20, 120, 220) is configured as a circumferential narrowing (20, 120, 220).

6. Piston according to claim 1, wherein the narrowing (20, 120, 220) is formed by precisely one material elevation (21) on a cooling channel wall, and wherein the cooling channel ceiling (18) is configured essentially in dome shape.

7. Piston according to claim 6, wherein the radial dimension (B) of the essentially dome-shaped cooling channel ceiling (18), at its widest point, is at least equal to twice the radial dimension (b) of the narrowing (20).

8. Piston according to claim 6, wherein the cooling channel (16) has a cooling channel wall (22) adjacent to the ring belt (15), which is configured to be vertical or inclined at a slant inward.

9. Piston according to claim 1, wherein the narrowing (120) is formed by precisely two material elevations (121) that lie opposite one another on two cooling channel walls.

10. Piston according to claim 8, wherein the cooling channel ceiling (118) has a flow divider (123) at its zenith, which divider is disposed centered relative to the narrowing (120).

11. Piston according to claim 9, wherein the regions (118a, 118b) of the cooling channel ceiling (118) that follow the flow divider (123) are configured to be arc-shaped or circular in cross-section.

12. Piston according to claim 9, wherein the flow divider (123) is configured to be V-shaped or conical in cross-section.

13. Piston according to claim 8, wherein the radial dimension (B) of the cooling channel ceiling (118), at its widest point, is at least equal to twice the radial dimension (b) of the narrowing (120).

14. Piston according to claim 1, wherein the narrowing (220) is formed by precisely two material elevations (221a, 221b), disposed axially offset relative to one another on two cooling channel walls.

15. Piston according to claim 14, wherein the two material elevations (221a, 221b) have a different thickness.