Piston for an internal combustion engine and method for its production

• US 20120222645A1
• Filed: 04/18/2011
• Published: 09/06/2012
• Est. Priority Date: 03/04/2011
• Status: Abandoned Application

• Current Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Original Assignee: Mahle International GmbH (MAHLE-STIFTUNG GmbH)
• Inventors: Edel, Helmut, Seeger-Van Nie, Andreas, Weisse, Volker
• Application Number:
  US13/066,561
• Publication Number:
  US 20120222645A1
• Time in Patent Office: Days
• US Class Current: 123/193.6
• CPC Class Codes: F02F 2003/0061 by welding
• 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: F05C 2201/021 Aluminium
• CPC Class Codes: F05C 2201/0448 Steel
• CPC Class Codes: Y10T 29/49252 Multi-element piston making

Abstract

The present invention relates to a piston (10, 110, 210) for an internal combustion engine, having a piston base body (11, 111, 211) and a piston ring element (12, 112, 212), whereby the piston base body (11, 111, 211) has at least an inner region (14) of a piston crown (13) as well as a piston skirt (16), which is provided with pin bosses (18) having pin bores (17), whereby the piston ring element (12, 112, 212) has at least an outer region (21) of a piston crown (13) having a circumferential top land (22), and a circumferential ring belt (23) provided with ring grooves (24). According to the invention, it is provided that piston base body (11, 111, 211) and piston ring element (12, 112, 212) are joined together by way of corresponding, conical joining surfaces (32, 33, 27, 28; 135, 136; 232, 233, 227, 228) configured on them. The present invention furthermore relates to a method for the production of such a piston.

Claims

1. Piston (10, 110, 210) for an internal combustion engine, having a piston base body (11, 111, 211) and a piston ring element (12, 112, 212), whereby the piston base body (11, 111, 211) has at least an inner region (14) of a piston crown (13) as well as a piston skirt (16), which is provided with pin bosses (18) having pin bores (17), whereby the piston ring element (12, 112, 212) has at least an outer region (21) of a piston crown (13) having a circumferential top land (22), and a circumferential ring belt (23) provided with ring grooves (24), wherein piston base body (11, 111, 211) and piston ring element (12, 112, 212) are joined together by way of corresponding, conical joining surfaces (32, 33, 27, 28;

135, 136;

232, 233, 227, 228) configured on them.

2. Piston according to claim 1, wherein the corresponding joining surfaces (32, 33, 27, 28;

135, 136;

232, 233, 227, 228) have different cone angles, as a whole or in certain regions, and/or the resulting gap is filled with a joining material.

3. Piston according to claim 1, wherein a circumferential cooling channel is provided in the piston ring element (112).

4. Piston according to claim 1, wherein piston base body (11, 211) and piston ring element (12, 212) jointly form a circumferential cooling channel (34, 234).

6. Piston according to claim 1, wherein the piston crown (13) has a combustion chamber bowl (15).

7. Piston according to claim 6, wherein the combustion chamber bowl (15) has a bowl edge (25) composed of a wear-resistant and/or temperature-resistant material.

8. Piston according to claim 1, wherein the piston base body (11, 111, 211) is produced from a metallic material, and the piston ring element (12, 112, 212) is produced from a wear-resistant and/or temperature-resistant material.

5. Piston according to wherein the piston base body (211) and/or the piston ring element (212) has/have a locally thickened part (237, 238) in the region of the ends of the joining surfaces (232, 233, 227, 228) on the cooling channel side.

9. Method for the production of a piston (10, 110, 210) for an internal combustion engine, having a piston base body (11, 111, 211) and a piston ring element (12, 112, 212), whereby the piston base body (11, 111, 211) has at least an inner region (14) of a piston crown (13) as well as a piston skirt (16), which is provided with pin bosses (18) having pin bores (17), whereby the piston ring element (12, 112, 212) has at least an outer region (21) of a piston crown (13) having a circumferential top land (22), and a circumferential ring belt (23) provided with ring grooves (24), wherein piston base body (11, 111, 211) and piston ring element (12, 112, 212) are joined together by way of corresponding, conical joining surfaces (32, 33, 27, 28;

135, 136;

232, 233, 227, 228) configured on them.

10. Method according to claim 9, wherein the corresponding joining surfaces (32, 33, 27, 28;

135, 136;

. 232, 233, 227, 228) have different cone angles, as a whole or in certain regions, and/or the resulting gap is filled with a joining material.

11. Method according to claim 9, wherein the piston base body (11, 111, 211) and the piston ring element (12, 112, 212) are joined together by means of gluing, welding, or soldering.

12. Method according to claim 9, wherein the piston ring element (12, 112, 212) and/or the piston base body (11, 111, 211) has/have an axial bracing force applied to it/them during the joining process.