Method for the manufacture of a cooled piston

• US 5,309,818 A
• Filed: 01/11/1993
• Issued: 05/10/1994
• Est. Priority Date: 10/18/1990
• Status: Expired due to Term

• Current Assignee: Federal-Mogul Worldwide Incorporated (Apollo Global Management, Inc.)
• Original Assignee: Mahle Metal Leve SA (MAHLE-STIFTUNG GmbH)
• Inventors: Lippai, Andre, Leites, Jose M. M., Mendes, Jose A. C.
• Primary Examiner(s): Denion, Thomas E.
• Application Number:
  US08/003,841
• Time in Patent Office: 484 Days
• Field of Search: 92/176, 92/222, 92/208, 92/231, 92/260, 29/888.04, 29/888.042, 29/888.044, 29/888.045, 123/193.6
• US Class Current: 92/176
• CPC Class Codes: B23P 15/10 pistons
• CPC Class Codes: F02F 2003/0061 by welding
• CPC Class Codes: F02F 2200/04 Forging of engine parts
• CPC Class Codes: F02F 3/003 the parts being connected by casting, brazing, welding or clamping
• CPC Class Codes: F02F 3/0069 the crown and skirt being interconnected by the gudgeon pin
• 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: F05C 2201/0448 Steel
• CPC Class Codes: F16J 1/001 One-piece pistons
• CPC Class Codes: Y10T 29/49252 Multi-element piston making
• CPC Class Codes: Y10T 29/49258 with thermal barrier or heat flow provision

Abstract

A cooled piston head and method of manufacture, the piston head having a closed cooling chamber. In one embodiment, the piston head is formed of a top member, an intermediate member and a pin boss member joined to each other preferably by welding; the top and intermediate members are provided with circumferential grooves which defines the closed cooling chamber. In an alternate embodiment, the head is formed of a top member and a pin boss member joined together preferably by welding; the closed cooling chamber is defined by circumferential grooves provided on both members.

Claims

1. Method for manufacture of a cooled piston head of the type having a closed cooling chamber, comprising the steps of:

providing a top member having a first circumferential groove facing in a first direction and a central recess with a first rib therebetween and a first wall outwardly of such first circumferential groove;

providing an intermediate annular member having on its upper face a second circumferential groove facing in a second direction opposite to said first direction, and a central through hole with a second rib therebetween and a second wall outwardly of said second circumferential groove, said intermediate member having a flat lower face;

providing a lower member having a central recess and a peripheral recess with a third circumferential rib on its upper face, at least one pin boss extending from the bottom part of said lower member;

joining by welding said top member to said intermediate member to form an integral structure with said first and second walls and said first and second ribs juxtaposed and welded together, said first and second grooves facing each other and forming the closed cooling chamber between said first and second walls and said first and second grooves, and the intermediate through hole and said intermediate member and said pin boss central recess being aligned;

joining by welding on the lower face of said intermediate member the circumferential third rib of said lower member to the assembly of said top member and said intermediate member.

2. The method of claim 1 wherein all of said members are made from steel blanks.

3. The method of claim 1 wherein the welding is friction welding.

4. A method according to claim 2 wherein said steel blanks are machined to produce the walls, ribs and grooves.

5. A method for manufacture of a cooled piston head of the type having a closed cooling chamber, comprising the steps of:

providing a top member having on the lower face thereof a first circumferential groove and central recess with a first rib therebetween and a first wall outwardly of said first groove,

providing a pin boss member having on the upper face thereof a second circumferential groove and a central recess with a second rib therebetween, a second wall outwardly of said second groove and a bottom wall, a relieved circumferential portion below said bottom wall, and at least one pin boss on the lower part thereof below said relieved portion;

joining said lower face of said top member to said upper face of said pin boss member by welding to form an integral structure with said first and second walls and said first and second ribs juxtaposed and welded together and said first and second grooves facing each other forming the closed cooling chamber between said first and second walls and said first and second grooves.

6. The method of claim 5 wherein all of said members are made from steel blanks.

7. The method of claim 5 wherein the welding is friction welding.

8. A method according to claim 6 wherein said steel blanks are machined to produce the walls, ribs and grooves.