Abstract:
The invention relates to a piston (10) for an internal combustion engine, comprising a piston head (11) and a piston skirt (21), wherein said piston head (11) comprises a piston base (13), a circumferential ring part (16) and, in the region of the ring part (16), a circumferential closed cooling channel or sealed cavity (18). An inner side (12) of the piston (10) comprises two lower surfaces (34a, 34b) which transform continuously in the region of the piston central axis (M) to form an arched surface (35). Said piston skirt (21) comprises piston hubs (22) provided with hub bores (23) which are interconnected by means of running surfaces (24, 25) which comprise inner surfaces (32a, 32b) facing the inside of the piston. The invention is characterised in that starting from the free ends of the piston skirt (21), inside the piston on the pressure side (DS) and/or counter pressure side (GDS), an inner surface (32a, 32b) of a running surface (24, 25) continuously transforms into a guiding surface (33a, 33b) for a coolant which transforms continuously on the side thereof into a lower surface (34a, 34b).
Abstract:
The invention relates to a piston (1) for an internal combustion engine, said piston (1) comprising a piston head (7) and a piston skirt (15), said piston head (7) having a circumferential ring part (8) and a circumferential cooling channel (5). Also, a ring support (4) is provided in the region of the ring part (8). According to the invention, said ring part (4) forms a wall section (11) of the cooling channel (5) and is in direct contact with said cooling channel (5) which has a cross-section with a contraction (12) formed in the central area of the cross-section.
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.
Abstract:
The invention relates to a hybrid pin (14) for connecting a piston for an internal combustion engine to a piston rod, said hybrid pin (14) consisting of a sleeve (3) made of steel and consisting of a core (2) which is pressed into the sleeve (3) and which is made of a lightweight metal alloy that can be cold-formed. The inner surface of the sleeve (3) has a profile, whereby an elastic elongation of the core (3) in the axial direction after the core (2) is pressed into the sleeve (3) is prevented to such an extent that the sleeve (3) is longer than the core (2) at both ends of the hybrid pin (14).
Abstract:
The present invention relates to a sliding bearing (10) having a carrier layer (12) made of a metallic material, a copper-based bearing metal layer (14) applied to the carrier layer (12), a diffusion barrier layer (16) applied to the bearing metal layer (14), and a sliding layer (18) made of tin that is applied to the diffusion barrier layer (16). The invention provides that the diffusion barrier layer (16) is made of pure iron.
Abstract:
The invention relates to an assembly (100, 200) consisting of a piston (10, 110, 210) made of a steel-based material, and a crankcase (140, 240) made of an aluminum-based material, for an internal combustion engine. Said piston (10, 110, 210) comprises 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, 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 (127, 227) in the form of a metal or a metal alloy which have a low-melting point.
Abstract:
The present invention relates to a method for producing a thermal barrier coating (39, 130) on a component (10, 110), said method being characterised by the following features: a) grinding a glass material to form a first solid in the form of a powder; b) mixing the powder with at least one deflocculant to form a suspension; c) processing the suspension (10, 110) by means of a high-velocity oxy-fuel spraying method, wherein c1) the liquid phase of the suspension (10, 110) is evaporated in the flame; c2) the glass material begins to melt or melts and is subsequently deposited on the component. The present invention further relates to a thermal barrier coating (30, 130) of this type and to a piston provided with a thermal barrier coating of this type.
Abstract:
The invention relates to a piston (10) for an internal combustion engine made of an iron-based material, comprising a piston head (11) and a piston skirt (12), said piston head (11) comprising a piston base (13), a peripheral top land (15) and a peripheral annular part (16) comprising annular grooves (17a, 17b, 17c). According to the invention, at least one annular groove (17a, 17b) comprises at least one insert (24, 27) made of an zinc-based material.
Abstract:
The present invention relates to a piston (10) for an internal combustion engine, comprising a piston head (11) and a piston skirt (16), wherein the piston head (11) has a circumferential ring part (15) and a circumferential cooling channel (23) in the region of the ring part (15), wherein the piston skirt (16) has piston bosses (17), which are provided with boss bores (18) and which are arranged on the underside (11a) of the piston head (11) by means of boss connections (19), wherein the piston bosses (17) are connected to each other by means of running surfaces (21, 22). According to the invention, at least one axial bore (24a, 24b, 24c, 24d), which is closed to the outside and which is arranged between a running surface (21, 22) and a boss bore (18), is provided inside a piston boss (17), the at least one bore (24a, 24b, 24c, 24d) opens into the cooling channel (23), and the cooling channel (23) and the at least one bore (24a, 24b, 24c, 24d) contain a filling (27) of sodium and/or potassium.
Abstract:
Die Erfindung betrifft einen Leichtmetallkolben für einen Verbrennungsmotor mit einem Grundkörper und einem um den Grundkörper umlaufenden und mit ihm verbundenen Ringelement, wobei der Grundkörper stirnseitig eine Verbrennungsmulde mit einer die Mulde begrenzenden, umlaufenden Muldenwand aufweist, die über einen Muldenrandbereich in einen Kolbenboden übergeht, der dadurch gekennzeichnet ist, dass die Muldenwand zumindest im Muldenrandbereich eine Bewehrung in Form eines Bewehrungsrings aus einem mit Silikonharz infiltrierten Graphit, insbesondere Elektrographit, aufweist.