Abstract:
PURPOSE:To obtain an easily manufactured engine part excellent in heat insulation and wearing resistance, by jointing metallic members through a metalized layer, coating on the surface of a ceramic member, and a shock absorptive metallic member. CONSTITUTION:A piston for a heat insulating engine is formed such that a ceramic piston crown 1, on the bottom face of which a metalized layer 2 is coated, and a metallic piston skirt 6 are integrally joined through a shock absorptive metallic member 3 of different kind from the piston skirt in a junction part 4 between the metalized layer and the shock absorptive metallic member and in a junction part 5 between the shock absorptive metallic member and the piston skirt. A ceramic constituting the piston crown 1, having a thermal expansion coefficient approximate to that of a metal constituting the piston skirt 6, is preferable. The metalized layer, consisting mainly of Mo, is preferable, and the shock absorptive metallic member 3 such as ferritic stainless steel, having a thermal expansion coefficient of 14X10 ( deg.C ) or less and equal to or less than that of the ceramic constituting the piston crown 1, is more preferable.
Abstract:
A ferrous piston for gasoline powered engines having dimensions which achieve reduced mass and improved performance is provided. The piston crown has a thickness of less than 4mm and includes valve pockets with an axial clearance between the valve pockets and an uppermost ring groove of less than 1.5mm. The pin bosses have an axial thickness of less than 3.7% of a bore diameter, which is the largest outer diameter of the piston, measured between a pin bore and the crown at 1mm from an inner face forming the pin bore. Each pin boss has a radial thickness of less than 3% of the bore diameter measured between the pin bore and a lower end of the pin boss. An undercrown surface presents a projected area of less than 45% of a total piston bore area, wherein the total piston bore area is πBD 2 /4, BD being the bore diameter.
Abstract:
Die Erfindung betrifft einen Kolben (10) für eine Kolbenmaschine (1), umfassend einen Kolbenboden (11), ein Kolbenhemd (12) sowie eine auf einer Oberfläche des Kolbens (10) angeordnete Beschichtung (20). Erfindungsgemäß ist vorgesehen, dass die Beschichtung (20) eine Legierung auf Basis von Eisen-Aluminium oder eine intermetallische Verbindung auf Basis von Eisen-Aluminium umfasst und so angeordnet ist, dass sie im Montagezustand des Kolbens (10) zumindest abschnittsweise an einen Brennraum (40) der Kolbenmaschine (1) angrenzt. Ein weiterer Aspekt der Erfindung betrifft ein Kraftfahrzeug aufweisend eine erfindungsgemäße Kolbenmaschine.
Abstract:
A steel piston for an internal combustion including a cooling gallery containing a solid coolant, such as an aluminum-based material, is provided. The solid coolant has a thermal conductivity which is greater than the thermal conductivity of the steel material and fills at least 15 volume percent (vol. %) of the cooling gallery. The solid coolant provides for exceptional cooling along a crown of the piston, reduces corrosion and erosion along the crown, and avoids the problem of oil coking.