Piston with high top ring location

Claim 2

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; and a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown.

Claim 3

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; and an insulator of low thermal activity interposed between said crown and at least one of said band and said body.

Claim 4

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; and an insulator of low thermal activity interposed between said crown and at least one of said band and said body.

Claim 5

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; and a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; said band being formed of hard metal and provided with at least one additional peripheral groove, unsuitable for receipt of a ring to reduce the mass of said band, said body being formed of a light-weight metal thereby providing a light-weight piston assembly.

Claim 6

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; and a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; said band being formed of hard metal and provided with at least one additional peripheral groove, unsuitable for receipt of a ring to reduce the mass of said band, said body being formed of a light-weight metal thereby providing a light-weight piston assembly.

Claim 7

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; and a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; said crown having a radially outwardly extending flange, said flange being relatively thin, and said groove being spaced from said flange by a narrow land having a diameter less than the diameter of said band.

Claim 8

An improved piston assembly comprising: a generally cylindrical piston body having a depending skirt; a metal crown secured to said body oppositely of said skirt; an annular metal ring groove protection band interposed between said crown and said body and clamped therebetween, said band including a first surface in substantial abutment with said crown and an adjacent second, radially outer surface; a radially outwardly opening, ring-receiving groove in said second surface adjacent said first surface; said band, crown and body defining a coolant receiving cavity; and a relief in said first surface at the radially inner extremity thereof and opening to said cavity for receipt of coolant to cool said groove and a ring received therein, said relief being defined by a plurality of circumferentially spaced cutouts separated by gussets, said gussets having surfaces forming part of said first surface and in substantial abutment with said crown; said crown having a radially outwardly extending flange, said flange being relatively thin, and said groove being spaced from said flange by a narrow land having a diameter less than the diameter of said band.