Abstract: A piston for internal combustion diesel engine having a piston diameter of 180 to 650 mm, includes a top part and a body part connectable to each other, the top part defining, when installed in a cylinder of the engine, the piston side of a combustion chamber, and the body part having an aperture for a gudgeon pin, bosses for distributing forces, when in use, between the piston and the gudgeon pin, the body part having an interior, an outer surface and operable connecting surfaces. The interior of the body part includes an interior wall having a macro geometry of wavy surface, where a wave has a length of 3 to 25 mm and a height of 0.3 to 3 mm, the wavy surface having a micro geometry measurable as a surface roughness of 5 to 9 ?m.

Abstract: A piston assembly for internal combustion diesel engine having a piston diameter of 160-650 mm, the piston assembly including a top part, a body part and a gudgeon pin connectable to each other, the top part defining, when installed in a cylinder, the piston side of a combustion chamber, and the body part having an aperture for a gudgeon pin, bosses for distributing forces between the piston and the gudgeon pin, the body part having an interior, an outer surface and operable connecting surfaces, the gudgeon pin for pivotally connecting the piston to a connecting rod, is configured to be assembled and lockable by locking elements to the body part aperture in a given rotational orientation such that there is provided a conduit for supplying cooling oil from the connecting rod via the gudgeon pin to the bosses and to a cooling gallery between the top and body parts.

Abstract: A piston assembly for an internal combustion diesel engine having a piston diameter of 160 to 650 mm, includes a top part, a body part and a cooling gallery arranged as a hollow space there between, the top part defining, when installed in an engine cylinder, the piston side of a combustion chamber, and the body part having an aperture for a gudgeon pin, bosses for distributing forces, when in use, between the piston and the gudgeon pin. The body part has an interior, an outer surface including indentations defined by the outer surfaces of the bosses and an imaginary boundary of the cylinder of the engine. The interior side of the top part forms an inner cooling surface for piston cooling fluid to flow along and cool the central area of the top part, and the body part includes a conduit extending between the indentation and the cooling gallery.

Abstract: A piston assembly for internal combustion diesel engine having a piston diameter of 160-650 mm, the piston assembly including a top part, a body part and a gudgeon pin connectable to each other, the top part defining, when installed in a cylinder, the piston side of a combustion chamber, and the body part having an aperture for a gudgeon pin, bosses for distributing forces between the piston and the gudgeon pin, the body part having an interior, an outer surface and operable connecting surfaces, the gudgeon pin for pivotally connecting the piston to a connecting rod, is configured to be assembled and lockable by locking elements to the body part aperture in a given rotational orientation such that there is provided a conduit for supplying cooling oil from the connecting rod via the gudgeon pin to the bosses and to a cooling gallery between the top and body parts.

Abstract: A piston (1) for internal combustion diesel engine having a piston diameter of 180 to 650 mm, includes a top part (2) and a body part (3) connectable to each other, the top part defining, when installed in a cylinder of the engine, the piston side of a combustion chamber, and the body part having an aperture (30) for a gudgeon pin (4), bosses (32) for distributing forces, when in use, between the piston and the gudgeon pin, the body part having an interior (33), an outer surface (34) and operable connecting surfaces (35). The interior of the body part includes an interior wall (330) having a macro geometry of wavy (331) surface, where a wave has a length of 3 to 25 mm and a height of 0.3 to 3 mm, the wavy surface having a micro geometry measurable as a surface roughness of 5 to 9 ?m.