Piston for an internal combustion engine

• US 9,109,530 B2
• Filed: 07/04/2012
• Issued: 08/18/2015
• 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
• Primary Examiner(s): Low, Lindsay
• Assistant Examiner(s): Tran, Long T
• Application Number:
  US14/130,584
• Publication Number:
  US 20140290618A1
• Time in Patent Office: 1,140 Days
• Field of Search: 123/193.6, 123/193.1, 123/41.01, 123/41.16, 123/41.34, 123/41.1
• US Class Current: 1/1
• 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. A piston (110) for an internal combustion engine, having a piston head (111) and a piston skirt, wherein the piston head (111) has a circumferential ring belt (115) as well as a circumferential cooling channel (116) in the region of the ring belt (115), having a cooling channel floor (117) and a cooling channel ceiling (118), wherein the cooling channel (116) has a circumferential narrowing (120) formed by precisely two material elevations (121) that lie opposite one another on two cooling channel walls, and wherein the cooling channel ceiling (118) has a flow divider (123) at its zenith, which divider is disposed centered relative to the narrowing (120).

2. The piston according to claim 1, 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.

3. The piston according to claim 1, wherein the flow divider (123) is configured to be V-shaped or conical in cross-section.

4. The piston according to claim 1, 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).

5. The piston according to claim 1, wherein the narrowing (120) has a distance from the cooling channel floor (117) that corresponds to at least one-third of the actual height of the cooling channel (120).

6. The piston according to claim 1, wherein the narrowing (120) has a distance from the cooling channel floor (117) that corresponds to at most two-thirds of the actual height of the cooling channel (120).

7. The piston according to claim 1, wherein the narrowing (120) has the same distance (A) from the cooling channel floor (117) and from the cooling channel ceiling (118).

8. A piston (210) for an internal combustion engine, having a piston head (211) and a piston skirt, wherein the piston head (211) has a circumferential ring belt (215) as well as a circumferential cooling channel (216) in the region of the ring belt (215), having a cooling channel floor (217) and a cooling channel ceiling (218), wherein the cooling channel (216) has a circumferential narrowing (220) formed by precisely two material elevations (221a, 221b) in a material of the piston, the elevations being disposed axially offset relative to one another on two cooling channel walls, wherein an inner widening (224) that extends to a combustion bowl (213) is formed in the region of the cooling channel floor (217), and wherein an outer widening (225) that extends to a uppermost ring groove of the ring belt (215) and to a top land (214) is formed in the region of the cooling channel ceiling (218), and wherein the narrowing (220) has a distance from the cooling channel floor (217) that corresponds to at most two-thirds of the actual height of the cooling channel (220).

9. The piston according to claim 8, wherein the two material elevations (221a, 221b) have a different thickness.