Abstract:
A thermal insulating material for combustion engine components, which are subjected to combustion gases, e.g. pistons (1). The insulation (3) consists of a metal layer sintered to a porosity of about 25-50 % and which is bonded to the engine component by casting.
Abstract:
A method of connecting aluminium or aluminium alloy to another metal material in which the other metal material (13) is connected first to a porous metal material (12). This may be by brazing or welding. This assembly is then placed in a die and the aluminium or aluminium alloy (10) is fed under gravity to the die and then solidified under pressure in a squeeze casting technique. The aluminium or aluminium alloy (10) penetrates the porous metal material (12) so that, on solidification, the aluminium or aluminium alloy (10) is firmly connected to the other material (13). This can find particular application in the manufacture of pistons for internal combustion engines where the piston body is of aluminium of aluminium alloy and a wear of heat-resistant insert is of ferous material. The insert may form a crown of the piston or an expansion control insert or a piston ring groove or an entrance to a combustion bowl or a combination of these features.
Abstract:
An internal combustion engine (10) comprising an engine frame (12) having a drive shaft (20) rotatably mounted therein and extending outwardly therefrom. A pair of cylinder sleeves (40, 40') are mounted on the engine frame (12) and have their inner ends positioned within the interior of the frame and their outer ends positioned outwardly thereof. A cylinder head (60, 60') is secured to the outer end of each of the sleeves and is separated thereby by means of a heat insulative gasket (70). Each of the cylinder heads (60, 60') has a dome-shaped chamber (62, 62') formed therein which is in communication with a source of combustible fuel. An air inlet conduit (94) is mounted on one end of the engine frame and is in communication with a source of air under pressure such as a blower, super-charger or the like. The air inlet conduit is in communication with an air passageway (100) formed in the engine frame (16) which is in communication with air inlet openings (52, 52') formed in the cylinder sleeves (40, 40'). The cylinder sleeves (40, 40') are provided with exhaust openings (54, 54') formed therein which communicate with an air exhaust passageway (102) formed in the engine frame (16). The exhaust passageway (102) is connected to exhaust conduit (106) or pipe extending from the engine frame (16). A piston (72, 72') is slidably mounted in each of the sleeves (40, 40') and has a dome-shaped head portion (76, 76') which is adapted to be received by the dome-shaped chamber (62, 62') in the cylinder head (60, 60') when the piston is in its top position. In the top position, the small "air space" (118) is present between the walls or sides (78, 78') of the piston head (76, 76') and the walls or sides of the sleeves (64, 64'). The "air space" (118) serves as a means for retarding the absorption of heat into the sides of the piston head (76, 76') and the sides of the cylinder sleeve (40, 40'). In the down position, the "air space" (118) also serves to spread the cooling air into a thin, wide sheet for more efficient cooling of the cylinder head (60, 60') and sleeves (40, 40'). Optional air deflecting fins (84, 86, 84', 86') may be employed on the piston head (76, 76'). The rings (82, 82') of the piston (72, 72') are conventionally lubricated and slide upon the interior wall (52, 52') of the cylinder sleeve (40, 40'). Each of the pistons (72, 72') has a roller (88, 88') mounted on the skin portion (74, 74') thereof which rolls upon a cam (32) mounted on a rotor plate (30) which is secured to the drive shaft (20) for rotation therewith. A return roller (92, 92') is also operatively mounted on the skin portion (74, 74') of the piston (72, 72') for engagement with a return cam (36) which is mounted on the drive shaft (30) for rotation therewith.
Abstract:
Piston for internal combustion engines of the composite type with a steel top part mounted on an aluminium bottom part which is provided with ring grooves. Said bottom part (2) comprises a circular cavity (3) open upwards, concentric and extending at the back of the bottoms of the ring grooves (5), said cavity being covered by the steel top part (1). Piston for high operating temperatures and pressures, particularly for Diesel engines.
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.
Abstract:
The invention relates to a metal cast component (1), which is intended in particular for parts of internal combustion engines or piston compressors, such as pistons, gearboxes, crankcases and other housings and/or cylinder heads, wherein the cast component (1) consists at least in certain portions of an iron aluminide and/or is a composite cast component comprising at least two portions (2, 3), which consist of a cast iron and/or an iron aluminide and/or a light metal. The invention also relates to a method for producing a metal cast component (1), in particular for parts of internal combustion engines or piston compressors, such as pistons, gearboxes, crankcases and other housings and/or cylinder heads, which consists of one or more cast materials such as cast iron and/or iron aluminide and/or light metal, in which method a first portion (2) of the cast component (1) is produced in a first casting operation and a further portion (3) of the cast component (1) is produced in a further casting operation and a coating, in particular of iron aluminide and/or a nickel alloy, is applied as a coupling agent layer to the first portion (2) before the further casting operation.
Abstract:
The invention relates to a piston (10,) for an internal combustion engine, comprising a piston head (11) and a piston skirt (16), said piston head (11) having a peripheral annular part (15) and in the region of said annular part (15), a peripheral cooling channel (23). The piston skirt (16) comprises piston bores (17) provided with hub bores (18), which are arranged over the hub connections (19) on the underside (11a) of the piston head (11). Said piston hubs (17) are interconnected over the running surfaces (21, 22). According to the invention, the wall (23a) of the cooling channel (23) which extends in the region of the annular part (15) comprises an inclined portion and together with the central axis of the piston (M), forms an acute angle (a). At least one bore (24a, 24b, 24c, 24d) which is closed towards the outside is arranged between a running surface (21, 22) and a hub bore (18) such that the at least one bore (24a, 24b, 24c, 24d) leads into the cooling channel (23), and that the cooling channel (23) and the at least one bore (24a, 24b, 24c, 24d) contain a coolant (27) in the form of a metal or a metal alloy which have a low-melting point.