Piston for an internal combustion engine

• US 9,068,529 B2
• Filed: 11/26/2012
• Issued: 06/30/2015
• Est. Priority Date: 11/26/2011
• Status: Expired due to Fees

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Linke, Timo
• Primary Examiner(s): Nguyen, Hung Q
• Assistant Examiner(s): KIM, JAMES JAY
• Application Number:
  US14/360,404
• Publication Number:
  US 20140352647A1
• Time in Patent Office: 946 Days
• Field of Search: 123/193.6
• US Class Current: 1/1
• CPC Class Codes: F02F 3/16 having cooling means
• CPC Class Codes: F02F 3/20 the means being a fluid flowing through or along piston
• CPC Class Codes: F02F 3/22 the fluid being liquid
• CPC Class Codes: F02F 3/225 the liquid being directed into blind holes

Abstract

The invention relates to a piston (10, 110) for an internal combustion engine. Said piston comprises a piston head (11), a piston skirt (12) and a peripheral recess (24) between the piston head (11) and the piston skirt (12), an annular peripheral cooling channel (17), which is open towards the bottom and which is closed by a closing element (18), being provided in the piston head (11), and the piston skirt (12) having fillets (21) which are connected to the bottom of the piston skirt (11) and interconnected via bearing surfaces (23, 123). According to the invention, at least one projection (26, 126) is formed in the region of a free end face (25, 125) of the bearing surfaces (23, 123) and extends radially into a region of the cooling channel (17), said projection matching an opening (19) in the closing element (18) of the cooling channel (17).

Claims

1. Piston (10, 110) for an internal combustion engine, having a piston head (11), a piston skirt (12), and a circumferential recess (24) formed between the piston head (11) and the piston skirt (12), wherein a ring-shaped, circumferential cooling channel (17) open toward the bottom and closed off with a closure element (18) having at least one opening (19) is formed in the piston head (11), wherein the piston skirt (12) has pin bosses (21) connected on the underside of the piston head (11), which are connected with one another by way of working surfaces (23, 123), wherein at least one projection (26, 126) that extends radially into a region below the cooling channel (17) is formed in the region of a free face surface (25, 125) of the working surfaces (23, 123), wherein said at least one projection corresponds with the at least one opening (19) in the closure element (18) of the cooling channel (17), so that cooling oil exiting from the cooling channel is guided by said at least one projection toward the working surfaces.

2. Piston according to claim 1, wherein the at least one projection (26, 126) is configured to be inclined in the direction of the piston head (11).

3. Piston according to claim 1, wherein the at least one projection (26, 126) has a drain groove (27, 127) that empties into the working surface (23, 123).

4. Piston according to claim 1, wherein multiple projections (26) disposed distributed over the circumference of the working surface (23) are formed.

5. Piston according to claim 1, wherein the projection (126) is configured as a one-part projection (126) that extends over the region of the entire face surface (125) of one of the working surfaces (123).

6. Piston according to claim 5, wherein the projection (126) has a collection groove (128) that runs essentially parallel to the working surface (123), into which at least one drain groove (127) that empties into the working surface empties.

7. Piston according to claim 5, wherein the projection (126) has a recess (129) that serves as an oil collection and drain surface extending essentially over the entire projection (126) and emptying into the working surfaces (123).

8. Piston according to claim 7, wherein the recess (129) is configured as a slanted plane inclined downward in the direction of the working surfaces (123).

9. Piston according to claim 1, wherein it is produced, at least in part, by means of a forging method.

10. Piston according to claim 1, wherein it is configured as a one-part or multi-part piston (10, 110).