Piston for an internal combustion engine and method for its production

• US 9,322,358 B2
• Filed: 07/22/2014
• Issued: 04/26/2016
• Est. Priority Date: 03/04/2011
• Status: Expired due to Fees

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Bing, Karlheinz, Lapp, Michael T., Scharp, Rainer, Ullrich, Michael
• Primary Examiner(s): Low, Lindsay
• Assistant Examiner(s): LATHERS, KEVIN ANTHONY
• Application Number:
  US14/337,316
• Publication Number:
  US 20140331958A1
• Time in Patent Office: 644 Days
• Field of Search: 921/90, 922/55, 922/60, 921/72, 298/880.4, 298/880.42, 123/193.6
• US Class Current: 1/1
• CPC Class Codes: B23K 2101/003 Pistons
• CPC Class Codes: B23K 26/28 of curved planar seams
• CPC Class Codes: B23P 15/10 pistons
• CPC Class Codes: F02F 2200/00 Manufacturing
• CPC Class Codes: F02F 3/00 Pistons
• 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
• CPC Class Codes: Y10T 29/49249 Piston making
• CPC Class Codes: Y10T 29/49252 Multi-element piston making

Abstract

A method for the production of a piston for an internal combustion engine, having a piston head, a piston skirt, and a circumferential recess configured between the piston head and the piston skirt. The piston has a piston base body and a piston ring element. The piston base body has at least a crown region of a combustion bowl as well as the piston skirt. The piston ring element has at least a piston crown, a wall region of the combustion bowl, a circumferential top land, and a circumferential ring belt with ring grooves. The piston ring element has a circumferential cooling channel between the wall region of the combustion bowl and the ring belt, closed with a closure element. The piston base body and the piston ring element are connected by a circumferential joining seam in the region of the combustion bowl.

Claims

1. A method for the production of a piston for an internal combustion engine, the piston having a piston base body and a piston ring element and a ring-shaped recess configured between a piston head and a piston skirt, the method comprising the following steps:

(a) making available a blank of a piston base body that has a crown region of a combustion bowl, the piston skirt, as well as a circumferential joining surface delimiting the crown region of the combustion bowl and forming an acute angle a with the longitudinal axis of the piston;

(b) making available a blank of a piston ring element that has at least a piston crown, a ring belt portion, a wall region of a combustion bowl, a circumferential recess between the wall region of the combustion bowl and the ring belt portion, as well as a circumferential joining surface delimiting the wall region of the combustion bowl and forming an acute angle a with the longitudinal axis of the piston; and

(c) connecting the blank of the piston base body with the blank of the piston ring element by way of their joining surfaces, to produce a piston blank.

2. The method according to claim 1, wherein subsequent to step (b) or subsequent to step (c), the circumferential recess is closed by a closure element, so that a circumferential cooling channel is formed.

3. The method according to claim 1, wherein subsequent to step (b), the circumferential recess is closed by a closure element which is reversibly or irreversibly attached in a region of the ring belt, so that a circumferential cooling channel is formed.

4. The method according to claim 1, wherein the blanks of piston base body and piston ring element are connected with one another by beam welding.

5. A piston produced according to a method of claim 1.