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Pistons and method for their manufacture

  • US 4,553,472 A
  • Filed: 08/22/1983
  • Issued: 11/19/1985
  • Est. Priority Date: 08/20/1982
  • Status: Expired due to Fees
First Claim
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1. A piston for an internal combustion engine comprising:

  • a crown of an iron based material,a piston body of aluminium or an aluminium alloy,an annular intermediate member of an iron based material and arranged between the crown and the piston body to space the crown from the piston body and define a heat insulating chamber therebetween,a layer of an aluminium alloy roll bonded to a surface of the intermediate member which is adjacent the piston body,a weld joining the roll bonded layer to the piston body,a weld joining the intermediate member to the crown,said welds extending around the whole circumference of the piston to seal the chamber.

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  • 3 Assignments
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