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Robust, lightweight, low compression height piston and method of construction thereof

  • US 10,584,659 B2
  • Filed: 03/22/2016
  • Issued: 03/10/2020
  • Est. Priority Date: 03/23/2015
  • Status: Active Grant
First Claim
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1. A piston for an internal combustion engine, comprising:

  • a monolithic piston body extending along a central longitudinal axis, said piston body having an upper wall forming an upper combustion surface with an annular ring belt region depending from the upper combustion surface for receipt of at least one piston ring, said upper combustion surface having first and second portions, said first portion extending annularly along an outer periphery of said upper wall and said second portion forming a combustion bowl depending radially inwardly from said first portion, said upper wall having an undercrown surface formed on an underside of said combustion bowl directly opposite said second portion;

    a pair of skirt portions depending from said ring belt region;

    a pair of pin bosses providing a pair of laterally spaced pin bores aligned along a pin bore axis for receipt of a wrist pin, said pin bosses being joined to said skirt portions via strut portions;

    said undercrown surface being bounded by said skirt portions, said strut portions and said pin bosses, said undercrown surface having an openly exposed projected 2-dimensional surface area, as viewed looking along said central longitudinal axis, between about 30-55 percent of an area defined by a maximum outer diameter of said piston body; and

    said piston body having diametrically opposite, peripherally enclosed channels extending over upper surfaces of said pin bosses and beneath said upper wall, with said enclosed channels opening into said bounded undercrown surface and projecting radially outwardly of outer end faces of said pin bosses.

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