PISTON OF TWO-PIECE CONSTRUCTION FOR AN INTERNAL COMBUSTION ENGINE

• US 20150226151A1
• Filed: 09/18/2013
• Published: 08/13/2015
• Est. Priority Date: 09/27/2012
• Status: Abandoned Application

• Current Assignee: KS Kolbenschmidt GmbH (Rheinmetall AG)
• Original Assignee: KS Kolbenschmidt GmbH (Rheinmetall AG)
• Inventors: Sikorsky, Willi, Emmerich, Ottliczky, Weiss, Eberhard, Luz, Gerhard
• Application Number:
  US14/431,635
• Publication Number:
  US 20150226151A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01P 3/06 Arrangements for cooling pistons
• CPC Class Codes: F02F 2003/0053 by soldering
• CPC Class Codes: F02F 2003/0061 by welding
• CPC Class Codes: F02F 3/003 the parts being connected by casting, brazing, welding or clamping
• CPC Class Codes: F02F 3/18 the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
• CPC Class Codes: F02F 3/22 the fluid being liquid
• CPC Class Codes: Y10T 29/49252 Multi-element piston making

Abstract

The invention relates to a piston (1) for an internal internal combustion engine, configured as a gallery-cooled piston of two-piece construction which comprises a main body (2) and a ring element (3). The ring element (2) which has a ring zone (18) and a fire land (17) encloses a cooling gallery (15) on the outside, which cooling gallery (15) is delimited on the inside by an intermediate wall (16) which separates the cooling gallery (15) from a combustion-chamber recess (12) which is made in a piston head (10) of the main body (2). The main body (2) and the ring element (3) together form two circumferential dividing planes (4a, 5a) which are offset with respect to one another, to which end in each case two interacting joining webs (6a, 6b; 7a, 7b) of the ring element (3) and of the main body (2) are connected with a material-to-material bond.

Claims

1. Piston (1) for an internal combustion engine configured as a cooling-gallery piston of two-piece construction that consists of a main body (2) and a ring element (3), wherein the ring element (3) with a ring belt (18) and a top land (17) encloses on the outside a cooling gallery (15) that is delimited on the inside by an intermediate wall (16) that divides the cooling gallery (15) from a combustion bowl (12) introduced into a piston crown (10) of the main body (2), and the ring element (3) is joined in a material-to-material bond to the main body (2), characterized in that the main body (2) and the ring element (3) jointly form two circumferential dividing planes (4a-4c;

5a, 5c) offset to each other, to which end two matching, interacting joining webs (6a, 6b;

7a, 7b;

21a, 21b) of the ring element (3) and the main body (2) are joined in a material-to-material bond.

2. Piston (1) from claim 1, wherein the dividing planes (4a, 4b;

5a, 5b) run between the ring element (3) and the main body (2) diverging from one another or matching vertically or horizontally.

3. Piston (1) from one of the preceding claims, wherein the dividing planes (4c, 5c) are aligned obliquely, or inclined.

4. Piston (1) from one of the preceding claims, wherein a vertically aligned dividing plane (5a) and a horizontally aligned dividing plane (4a) are provided between the ring element (3) and the main body (2).

5. Piston (1) from one of the preceding claims, wherein a height offset H results between the vertically aligned dividing plane (5a) assigned to the piston crown (10) and the horizontally aligned dividing plane (4a).

6. Piston (1) from one of the preceding claims, wherein the main body (2) forms a circumferential step (20) on the outside whose joining web (7b) running concentric to the longitudinal axis (11) of the piston (1) is enclosed at least in sections by the joining web (7a) of the ring element (3).

7. Piston (1) from one of the preceding claims, wherein the matching joining webs (6a, 6b;

7a, 7b;

21a, 21b) of the ring element (3) and the main body (2) are dimensioned at least approximately equal.

8. Piston (1) from one of the preceding claims, wherein the main body (2) and the ring element (3) are produced from a matching material or from different materials.

9. Method for producing a piston (1) for an internal combustion engine, configured as a cooling-gallery piston of two-piece construction that consists of a main body (2) and a ring element (3) in accordance with at least one of the claims 1 to 8, characterized by the following procedural steps:

Producing a main body (2) and a ring element (3) as forged or cast blanks by means of forging or casting or that are produced by stamping from a semi-finished material from a steel material;

Pre-machining of the main body (2) and the ring element (3) which includes introducing a combustion bowl (12) into the main body (2) and creating a ring belt;

Joining two matching joining webs (6a, 6b;

7a, 7b;

21a, 21b) of the main body (2) and the ring element (3), which respectively form a dividing plane (4a-4c;

5a-5c), by means of a material-to-material bond;

Finish or final machining of the piston (1).