A steel piston with an engineered coating is provided. A high thermal conductivity material, for example copper, is disposed on first regions of a combustion bowl to reduce hot spots in the piston. A low thermal conductivity material, for example a ceramic, is disposed on second regions of the combustion bowl to reduce loss of heat through the piston. The high thermal conductivity material disposed on the combustion bowl has a surface roughness (R.sub.a) of less than 5 μm to help reflect IR radiation and promote fuel flow. The low thermal conductivity material disposed on the combustion bowl has a surface roughness (R.sub.a) of less than 3 μm to promote fuel flow. The low thermal conductivity material is also disposed on the bowl rim and top ring land, and has a surface roughness (R.sub.a) of greater than 8 μm on the bowl rim and top ring land to retard gas flow.

A piston for an internal combustion engine is provided. The piston includes an open inner cooling area in which the undercrown surface is exposed, and an annular outer cooling gallery. The piston also includes an oil outlet scoop for local cooling of the undercrown surface of the piston. The outer cooling gallery includes an oil outlet opening, and the oil outlet scoop is beneath and vertically aligned with the oil outlet opening. The oil outlet scoop includes a concave surface facing the oil outlet opening. During operation, oil exits the oil outlet opening, and the oil outlet scoop catches the exiting oil and directs the oil to the inner cooling area and the exposed undercrown surface.

An internal combustion engine includes an engine block, a piston, a cylinder head, and a valve train. The engine block includes a cylinder block including a cylinder bore and a crankcase defining a crankcase chamber with a crankshaft positioned within the crankcase chamber. The piston is coupled to the crankshaft and configured to reciprocate within the cylinder bore. The cylinder head is coupled to the cylinder block. The valve train includes a camshaft, a first and second pushrod, a first and second rocker arm, an exhaust valve housed, and an intake valve. The first rocker arm, the second rocker arm, the exhaust valve, and the intake valve each include at least a layer of a low friction material. The first and second pushrod each pass through a pushrod seal to prevent fluid from reaching the rocker chamber to fluidly isolate the rocker chamber from the crankcase chamber.

An upper member of a steel piston has a chemical composition which consists of, in mass %, C: 0.15 to 0.30%, Si: 0.02 to 1.00%, Mn: 0.20 to 0.80%, P: 0.020% or less, S: 0.028% or less, Cr: 0.80 to 1.50%, Mo: 0.08 to 0.40%, V: 0.10 to 0.40%, Al: 0.005 to 0.060%, N: 0.0150% or less, O: 0.0030% or less, and the balance: Fe and impurities, and satisfies Formula (1) and Formula (2), in which, at a cross section parallel to the axial direction of the upper member, the number of Mn sulfides is 100.0 per mm.sup.2 or less, the number of coarse Mn sulfides having an equivalent circular diameter of 3.0 μm or more is within a range of 1.0 to 10.0 per mm.sup.2, and the number of oxides is 15.0 per mm.sup.2 or less.
0.42≤Mo+3V≤1.50  (1)
V/Mo≥0.50  (2)

A sprayed coating for a sliding member of the present invention includes a ferrous alloy containing iron (Fe) as a major ingredient. The sprayed coating for the sliding member containing 10 mass % or more and 20 mass % or less of chromium (Cr), and 0.1 mass % or more and 0.5 mass % or less of silicon (Si) and having the content rate of an oxide in the sprayed coating of 1 area % or less has corrosion resistance with improved seizure resistance.

A piston for an internal combustion engine which is coated for enhanced oxidation protection and/or erosion protection is provided. The piston includes a body formed of an iron-based material. The iron-based material is coated with a superalloy and manganese phosphate. The superalloy is preferably NiCrAlY, NiCrAl, NiCr, CoCrAly, and/or CoNiCrAlY. The manganese phosphate can be disposed on the superalloy, but not between the superalloy and the iron-based material. The superalloy preferably has a thickness of 0.1 to 2.0 mm, a porosity of 1% to less than 5%, and a surface roughness of less than 5 microns Ra. Another component for an internal combustion engine which is coated with the superalloy and the manganese phosphate is also provided.

A method to manufacture an automobile vehicle engine aluminum piston, comprises: printing an aluminum piston crown portion including an additive manufacturing (AM) piston crown work piece using initial aluminum powders defining an initial aluminum powder bed; removing the aluminum piston crown portion from the initial aluminum powder bed; fixedly joining a cast iron ring carrier to the AM piston crown work piece; placing the aluminum piston crown portion together with the cast iron ring carrier into a secondary and a tertiary aluminum powder bed; and printing a piston skirt integrally connected to the AM piston crown work piece and to the cast iron ring carrier.

A steel piston with an engineered coating is provided. A high thermal conductivity material, for example copper, is disposed on first regions of a combustion bowl to reduce hot spots in the piston. A low thermal conductivity material, for example a ceramic, is disposed on second regions of the combustion bowl to reduce loss of heat through the piston. The high thermal conductivity material disposed on the combustion bowl has a surface roughness (R.sub.a) of less than 5 μm to help reflect IR radiation and promote fuel flow. The low thermal conductivity material disposed on the combustion bowl has a surface roughness (R.sub.a) of less than 3 μm to promote fuel flow. The low thermal conductivity material is also disposed on the bowl rim and top ring land, and has a surface roughness (R.sub.a) of greater than 8 μm on the bowl rim and top ring land to retard gas flow.

A method to manufacture an automobile vehicle engine aluminum piston, comprises: printing an aluminum piston crown portion including an additive manufacturing (AM) piston crown work piece using initial aluminum powders defining an initial aluminum powder bed; removing the aluminum piston crown portion from the initial aluminum powder bed; fixedly joining a cast iron ring carrier to the AM piston crown work piece; placing the aluminum piston crown portion together with the cast iron ring carrier into a secondary and a tertiary aluminum powder bed; and printing a piston skirt integrally connected to the AM piston crown work piece and to the cast iron ring carrier.

A piston arrangement (12) for an internal combustion engine (10) comprises one or more pistons (14) which are at least partly constructed from a technical ceramic material. An axially disposed bore (20) for receiving a heat transfer member (22) is provided in at least one of the pistons (14). The heat transfer member (22) is reconfigurable from a first, solid, state to a second state in which at least part of the heat transfer member (22) is in a liquid state so as to transfer heat away from and thus cool the piston rod (16) as the piston reciprocates. A cylinder arrangement (46) for the internal combustion engine (10) comprises one or more cylinders (48) which are at least partly constructed from a technical ceramic material. One or more grooves (54) are formed in the cylinder (48), to decrease the thermal gradient between the inside and outside of the cylinder (48). A piston (14) for the internal combustion engine (10) comprises a piston rod (16) and a piston crown (18) which is at least partly constructed from a technical ceramic material. An insulation arrangement (40) between the piston rod (16) and the piston crown (18) comprises segments (42) configured such that when disposed on the piston rod (16) axial slots or spaces are defined between the segments (42).