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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
First Claim
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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.

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