Piston with cooling gallery cooling insert and method of construction thereof

A piston for an internal combustion engine, comprising:

• a piston body including a top part and a bottom part, said top part having an upper combustion surface configured for direct exposure to combustion gasses within a cylinder bore, said upper combustion surface having a top surface and combustion bowl recessed therein, said combustion bowl having a floor and an annular side wall extending upwardly toward said top surface, with an annular combustion bowl rim extending between said top surface and said side wall;
• said bottom part having a bottom wall and a pair of pin bosses depending from said bottom wall, said pin bosses having axially aligned pin bores and said bottom wall having an oil inlet;
• said top part being fixed to said bottom part with an annular cooling gallery being formed therebetween, said bottom wall forming a portion of said cooling gallery with said oil inlet extending into said cooling gallery, said side wall having a radially outwardly facing side bounding a portion of said cooling gallery, said radially outwardly facing side having an annular recessed channel formed therein adjacent said combustion bowl rim;
• and
• a cooling ring being spring biased and disposed in said annular channel, said cooling ring being configured to channel coolant therein adjacent said combustion bowl rim.