摘要:
The invention relates to a piston of an internal combustion engine, which piston forms a single-piece piston (1a) according to the production thereof and comprises a piston upper part (2a) and a piston lower part (3a) which are supported via corresponding joining webs (4a, 5a; 6a, 7a), in each case forming a joining zone (8a, 9a), and are connected in a material-to-material manner by means of a multi-orbital rotary friction weld. Here, the joining webs (4a, 5a) and (6a, 7a) which are in each case directly connected have a wall thickness S1, S2 which is identical as far as possible. The piston (1a) encloses a combustion-chamber recess (15a) and at least one cooling duct (18a) which are made centrally or eccentrically in the piston (1a). Here, the combustion-chamber recess (15a) and the cooling duct (18a) form a circular contour or a contour which deviates from a circular shape.
摘要:
In order to machine at least one workpiece (1) on a lathe, wherein the workpiece (1) rotates in the lathe and the at least one region to be machined of the workpiece (1) is machined with the aid of at least one tool (3) of the lathe, wherein the tool (3) is moved at least parallel to the rotation axis (2) of the workpiece (1), according to the invention the tool (3) is moved parallel to the rotation axis (2) of the workpiece (1) such that the machined region of the workpiece (1) is formed in a rotationally asymmetrical manner with respect to the rotation axis (2) of the workpiece (1) after machining. Furthermore, the invention relates to a cooling duct (7), to a piston wall (13) and to a combustion-chamber hollow (9) of a piston (6) and also to a lathe.
摘要:
The invention relates to a cylinder liner (2) of a cylinder of an internal combustion engine, in which cylinder liner an oscillating piston (3) is guided on a running surface (4), wherein the cylinder liner (2) is fixed vertically by means of a collar (5) between a cylinder housing (1) and a cylinder head. The wet cylinder liner (2) comprises an outer side (6) which deviates from a circular shape and/or a rotationally asymmetrical outer contour of the collar (5). The cylinder liner (2) is fitted in a positionally oriented manner in a corresponding receptacle of the cylinder housing (1).
摘要:
Die Erfindung betrifft einen Kolben einer Brennkraftmaschine, aufweisend ein erstes einen Kolbenboden bildendes und ein zweites einen Kolbenschaft bildendes Kolbenbauteil, wobei das erste Kolbenbauteil einen hinter einem Ringfeld liegenden nach unten offenen Freibereich aufweist und die beiden zusammengebrachten Kolbenbauteile den einteiligen Kolben bilden, der dadurch gekennzeichnet ist, dass - das erste Kolbenbauteil als Kolbenhauptteil (1) mit einem Ringfeld (11) und dem hinter dem Ringfeld (11) angeordneten Freibereich (13) sowie einem darunter angeordneten Innenschaftteil (14), dessen Durchmesser gegenüber dem Außendurchmesser im Bereich des Ringfeldes (11) zurückgesetzt ist, das eine Bolzenbohrung (15) in einer Kolbennabe (16) aufweist, ausgebildet ist, - das zweite Kolbenbauteil als ein zylindrisches Kolbenschaftteil (3), dessen Außendurchmesser dem Außendurchmesser im Bereich des Ringfeldes (11) entspricht, ausgebildet ist, - das Kolbenschaftteil (3) koaxial über dem Innenschaftteil (14) angeordnet ist, - das Innenschaftteil (14) ein Außengewinde und das Kolbenschaftteil (3) im zugehörigen Bereich ein Innengewinde aufweist, wobei die Gewinde eine Verschraubung bilden, wenn das Kolbenschaftteil (3) auf das Innenschaftteil (14) aufgeschraubt wurde, - zumindest ein ein- oder mehrteiliges Verschlusselement (2) vorgesehen ist, mit dem der Freibereich (13) verschlossen ist, bevor oder nachdem das Kolbenschaftteil (3) auf das Innenschaftteil (14) aufgeschraubt wurde, insbesondere wobei das Kolbenschaftteil (3) das Verschlusselement (2) an dem Kolbenhauptteil (1) festlegt.
摘要:
The invention relates to a method for producing composite materials that consist of carbon nanotubes (CNTs) and one or more metals, by producing and sintering a mixture of said metals and CNTs, and introducing said mixture into a metal melt or into an extrusion process.
摘要:
The invention relates to a bearing of a piston pin (11) in a piston (1) of an internal combustion engine, by way of which a connecting rod (2) is hinged to the piston (1). To this end, a piston shaft (8) is provided with two mutually spaced piston pin hubs (9), each having a hub bore (10), designed to receive the piston pin (11), which at the same time is guided through a bore (12) of a connecting rod eye (13). Each bore (10, 12), at least in a portion, has a bore profile (14) that deviates from a cylindrical shape and has an asymmetric precision geometry. In the circumferential direction, the bore profile (14) thus includes at least one superimposed ovality (15, 16), which in a bore inlet (19) and/or a bore outlet (20) between an X-axis and a Y-axis has a deviating contour. Likewise, in at least one section adjacent to the X-axis and/or the Y-axis, the bore profile (14) has a different design as compared to a corresponding opposing section. Furthermore, in an internal portion (21), the contour of the bore profile (14) deviates from that of the bore inlet (19) and/or the bore outlet (20).
摘要:
The invention relates to a method for producing a piston of an internal combustion engine, wherein the piston has a combustion bowl comprising a combustion bowl rim, and the combustion bowl rim is hardened by being remelted in a first step by means of an inductive energy supply and in a further step by means of a laser beam. According to the invention, the laser beam is deflected during a rotary, progressive motion relative to the piston.
摘要:
Die Erfindung betrifft einen flüssigkeitsgekühlten Kolben (1) einer Brennkraftmaschine, in dem ein radial umlaufender, zu einem Kolbenboden (2) beabstandeter Kühlkanal (6a) integriert ist. Über Einspritzdüsen (11, 12) wird ein Kühlmittel, ein Schmieröl der Brennkraftmaschine, in einem freien Strahl in Eintrittsöffnungen (13, 14) eingespritzt, das Abschnitte (15, 16) des geteilt gestalteten Kühlkanals (6a) im Gleichstrom durchströmt und den Kolben (1) durch getrennte Austrittsöffnungen (17, 18) verlässt. Eine weitere schräg zu einer Längsachse (21) des Kolbens (1) geneigt angeordnete Einspritzdüse (19) beaufschlagt eine Unterseite (20) des Kolbens (1) mit Kühlmittel.
摘要:
The invention relates to a piston (1) of an internal combustion engine comprising an upper part (3) made of steel and a bottom part (2) bonded by means of friction-welding in the region of a contact geometry (4) by means of joining bars (10a, 10b; 11a, 11b) to form an assembly. At least one cooling channel (7) permeated by a cooling agent is integrated in the piston (1), wherein a lubricating oil of the internal combustion engine enters an inlet opening (14) as a cooling agent by means of a free stream of an injector, flows through the cooling channel (7), and exits via an exit opening (15). In order to introduce the cooling agent into the cooling channel (7), the inlet opening (14) is associated with a flow pipe (13) mounted in the bottom part (2) and protruding out of a cooling channel floor (19), the opening (17) thereof being disposed above weld coils (12a, 12b) of the friction welder.