Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
  • F01P3/00—Liquid cooling
  • F01P3/06—Arrangements for cooling pistons
  • F01P3/08—Cooling of piston exterior only, e.g. by jets
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
  • F02F3/0015—Multi-part pistons
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
  • F02F3/00—Pistons 
  • F02F3/16—Pistons  having cooling means
  • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
  • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

• the invention relates to a method for cooling a piston of an internal combustion engine, in which a piston head, which is exposed to at least one fuel steel, is cooled by sprayed oil, and a piston of an internal combustion engine, according to the features of the respective preamble of the two independent claims.
• WO 2007/110056 A1 discloses a piston for an internal combustion engine, in the circumferential cooling channel of which an annular partition wall arranged parallel to the piston crown is provided.
• the partition has one or more nozzle-like openings. Oil is used as the cooling medium of the piston.
• the oil outlet jet of the respective opening is directed against the underside of the piston crown. In this case, the exit jets strike the areas of the underside whose areas lying on the opposite upper side are exposed to at least one combustion jet.
• the object of the invention is therefore to provide a method and a piston of the type described above, with which the temperature of the piston can be reduced during operation.
• the object is achieved according to the invention in that the oil is sprayed continuously targeted to the region of the underside of the piston crown, which is opposite to the region of the piston crown, which is not directly exposed to the combustion jet.
• the targeted cooling by means of oil reduces the temperature at the combustion bowl and at the annular grooves in the piston.
• the reliability of the piston is improved by a reduced operating temperature.
• the surface temperature of the piston, in particular the piston crown lowered.
• the cooling reduces the risk of material fatigue of the piston.
• the material is protected against failure, such as material cracks, material wear and / or material removal.
• optimum cooling of the piston is achieved. Due to the adapted pressure in the pressure chamber, the oil is sprayed out of it so optimally that an oil carbon buildup on the underside of the piston is prevented.
• the piston contains at least one interrupted cooling channel, so that the cooling channel itself is not completely circumferential in the piston. It is possible in a further advantageous embodiment of the invention that the piston contains a plurality of cooling channels, which are each interrupted and at a distance from each other in preferably a plane encircling. The respective cooling channels are preferably each arranged at the same distance to the piston central axis in the plane.
• the cooling channel of the piston can also be in a further advantageous embodiment completely as a cooling channel in the piston circumferentially.
• the separating element is positioned according to the invention in the cooling channel and divides the cooling channel of the piston in two areas.
• the one forming region in the cooling channel is a cooling channel which is reduced in volume and the other forming region is a pressure chamber which forms in the former cooling channel and whose volume corresponds approximately to the difference between the volume of the cooling channel and the reduced cooling channel.
• the separator has at least one opening from which the oil exits continuously and from which the oil is injected onto the underside of the piston crown.
• the separating element is designed so that it is adapted to the shape of the cooling channel.
• the separator is suitably positioned in the cooling channel.
• the separating element is designed as a part.
• the separating element can also consist of several individual parts and be composed of these into a separating element.
• the shape of the separator may have a planar shape, a partition, a curved shape, an oblique shape, or any other geometrically possible shape.
• the dimensions of the separating element are adapted to the use of the piston. Thus, depending on the dimensions of the piston, and thus also on the dimensions of the cooling channel, the partition dimensioned appropriately.
• the separating element made of a metal or a light metal, preferably made of steel, a steel alloy, aluminum or an aluminum alloy. Furthermore, it is possible that the separating element consists of a plastic or a hard material.
• the separating element is preferably produced by means of a primary shaping method, for example casting, by means of a forming process, for example forging or pressing, and / or by means of a machining production method, for example turning, grinding or milling.
• the pressure chamber in the cooling channel of the piston is formed between a part of the wall of the cooling channel and a part of the wall of the separating element.
• the pressure chamber is filled according to the invention with oil under pressure. Alternatively, it is also possible that the pressure chamber is filled with any other cooling medium.
• a part of the surface of the pressure chamber in the piston is preferably processed by means of a manufacturing process, preferably by means of a machining production process, to produce a good surface quality.
• the good surface quality enables the appropriate introduction of the separating element in the processed by a manufacturing process such as grinding and / or milling cooling channel.
• the part of the surface of the pressure chamber is preferably processed from the side, that is, tools machined, for example, in a two-piece piston, matching the pressure chamber wall at the contact surfaces of separating element and pressure chamber wall as well as the other surface of the pressure chamber respectively from the Side.
• a closed pressure chamber can be formed, since the walls of the cooling channel with the separating element form a fit with low tolerance.
• the pressure chamber formed by the separating element in the cooling channel is sealed in a further advantageous embodiment of the invention via at least one sealing element, preferably by means of at least one sealing ring element and / or at least one hard rubber against the cooling channel in the piston parts of the contact surface of the separating element and the cooling channel to To avoid pressure loss in the pressure chamber.
• a sealing ring element and / or hard rubber is preferably used.
• the pressure chamber filled with oil is preferably a pressure of 1, 5 to 10 bar, preferably a pressure of about 3 bar, constructed.
• a pressure builds up continuously in the pressure space and oil is continuously collected in the pressure space.
• new oil flows continuously into the pressure chamber at a certain pressure and flow rate, so that it can be used for operation set pressure is maintained.
• the pressure built up in the oil-filled pressure chamber is preferably generated via connecting rods or bolts by means of pumping action or injection. When the oil is supplied via the bolt, it is possible, for example, for the oil to be supplied via the pin bore.
• a different pressure which is outside the limits of 1, 5 bar and 10 bar, can be set appropriately.
• the separating element is attached to the cooling channel by means of a frictional connection, preferably a screw connection or a press connection.
• a frictional connection preferably a screw connection or a press connection.
• the separating element is positioned in the cooling channel and preferably secured by at least one screw and at least one thread in the piston to the cooling channel.
• the press connection the separating element is mounted in the cooling channel so that preferably forms a non-detachable connection between the separating element and the cooling channel.
• the separating element is attached to the cooling channel by means of a material connection, preferably gluing and / or welding.
• a material connection preferably gluing and / or welding.
• the separating element positioned in the cooling channel is preferably glued to it and / or preferably welded thereto. This results in a non-detachable connection between the separating element and the cooling channel.
• the separating element in the cooling channel by means of a primary molding process, preferably casting, is generated.
• the piston is also preferably produced by a urformendes process, such as sand casting or chill casting, as a one-piece piston.
• the cooling channel and the separating element therein are then produced together, for example, during casting by means of sand casting with the lost core technique directly in the piston.
• the dividing element may also be poured directly into the flask by means of the technique of lost sweeping during casting during casting.
• the upper part and the lower part can be cast separately from each other, wherein during the casting of the upper part or of the lower part, the separating element is cast with.
• the piston or the upper and the lower part by means of a forming process, such as forging or pressing, or by means of a machining process, such as turning or milling, are produced.
• the upper part and the lower part can each also be produced with different production methods.
• the one-piece piston is preferably made of a metal or light metal, preferably iron, steel, a steel alloy, aluminum or an aluminum alloy.
• a two-piece piston having a top and bottom same or different materials are used for the top and bottom.
• the material for the upper part and the lower part is preferably metal or light metal, in particular iron, steel, a steel alloy, aluminum or an aluminum alloy used.
• the pressurized oil used to cool the piston in the pressure space is continuously injected through at least one opening in the separation element towards the bottom of the piston.
• the oil is preferably continuously sprayed onto the region of the underside of the piston crown which lies opposite the region of the piston crown which is not directly exposed to the combustion jet.
• exactly the area of the piston is cooled, which is not cooled by at least one combustion jet. It is known from temperature measurements that in the areas where the jet does not impinge in the flask and is not cooled by fuel of the combustion jet, a temperature of 100 0 C and more occurs.
• a combustion jet is understood to mean a fuel jet introduced into the combustion chamber, which impinges on the surface of the piston crown and is burnt in the combustion chamber.
• the opening is formed in the partition member itself or is formed by two or more individual parts which are composable together to form a partition member.
• the separating element is depending on the configuration the cooling channel also formed in the manner of a distribution ring or ring, wherein the oil is injected through the opening of the separating element respectively fitting to the underside of the piston head, based on the circular, annular and / or elliptical circulation of the cooling channel.
• the cooling channel may also be interrupted in the course of a circular, annular and / or elliptical circulation, so that a complete circle, ring and / or elliptical shape results only when the interrupted areas are connected by thought.
• the opening in the separating element is preferably designed as a normal bore.
• the opening in the separating element is not specially processed in terms of production technology with respect to the surface and shape.
• the opening may also be formed as a Venturi nozzle or in the manner of another type of nozzle.
• the opening, which is a normal bore be drilled out in the manner of a nozzle, so that a bore results in the manner of a nozzle.
• the opening is formed as a further advantageous embodiment of the invention is preferably tubular, slit-shaped and / or nozzle-shaped. In one embodiment of the opening as a wide slot results in a slot-shaped opening from which a broad area beam can emerge.
• the opening is aligned according to the invention in the direction of the region of the underside of the piston crown, that the oil continuously injected selectively on the region of the underside of the piston crown, which is opposite to the region of the piston crown, which is not directly exposed to the at least one combustion jet.
• the opening may be aligned in a further advantageous embodiment in the direction of a region of the underside of the piston crown, so that the oil is sprayed specifically targeted to the region of the underside of the piston crown, which is opposite to the region of the piston crown, the at least one Burning jet is exposed directly.
• the oil is additionally removed and accelerated in a further advantageous embodiment of the invention from the pressure chamber by a stroke movement of the piston through the opening of the separating element in the direction of the underside of the piston. Due to the inertia of the oil in the pressure chamber, the pressure in the pressure chamber is increased by the stroke movement of the piston, especially when the piston moves out of the combustion chamber and the combustion chamber increases.
• the number of openings in the separator must be coordinated.
• the diameter of the respective opening must be adapted for optimum cooling.
• the dimensions of the opening in the separating element is in each case adapted to the dimensions of the separating element and the necessary cooling capacity for the respective piston.
• a number of openings from 1 to 180 are used for a complete circumferential channel.
• the number of openings for an interrupted cooling channel results in each case with the help of the factor, which can be calculated from the ratio of the length of the interrupted cooling channel to the length of the complete circumferential cooling channel.
• the preferred number of openings is 1 to 90 because the resulting ratio is 0.5.
• the ratio of the number of openings to the diameter of the opening may be between 1: 10 1 / mm (one to ten per millimeter) and 360: 1 1 / mm (360 to one per millimeter).
• the piston is made of an upper part and a lower part, from which at least one common bearing surface in the assembly of the piston can be formed.
• the piston contains at least one cooling slot and / or at least one cooling hole.
• the cooling slot and / or the cooling hole may preferably be arranged in each case between the interrupted cooling channels, so that the cooling of the piston or the piston crown is reinforced by means of the cooling slot and / or the cooling hole.
• Figure 1 a section of a piston, in the cooling channel of the
• Separating element is attached by means of stud bolts to the cooling channel
• Figure 2 and 3 a separating element in a piston neck, with the aid of
• Figure 4 another embodiment of a separating element in a
• FIG. 1 a section of a piston 1 is shown for an internal combustion engine.
• the piston 1 is constructed identically in each case in the three exemplary embodiments and will first be described generally in the following. Subsequently, the three embodiments are each shown in detail. Finally, the piston in the operating state will be described with reference to the three embodiments.
• the same components are in the four figures with Named the same reference numerals and new reference numerals are used in the figures for different components.
• the piston 1 for an internal combustion engine is made in the three embodiments of an upper part 2 and a lower part 3.
• the upper part 2 is manufactured separately from the lower part 3. Between upper part 2 and lower part 3 at least one common support surface is formed. In the three examples, two bearing surfaces 4, 5 are formed in each case.
• the upper part 2 and the lower part 3 are in the embodiment by means of a frictional connection, in the example by means of a single screw connection, connected to each other (not shown).
• a pin is used, which positions the two bearing surfaces 4, 5 appropriately.
• the upper part and the lower part can also be connected to one another by means of a further frictional connection, for example a press connection.
• the upper part and the lower part can also be connected to each other by means of a cohesive connection, for example gluing and / or welding.
• the piston 1 contains at least one combustion bowl 6, in the examples in each case a single combustion bowl 6, at least one annular groove 7, in the examples in each case three annular grooves 7 surrounding the entire piston 1, a single piston head 17, at least one cooling channel 9, in the examples two interrupted in the piston 1 cooling channels 9, and at least one outlet opening 10 for discharging the oil from the respective cooling channel 9, in the examples a plurality of outlet openings 10 for the respective interrupted cooling channel 9.
• the piston 1 for each interrupted cooling channel 9 in the each embodiment of Figure 1 to 3 a single in the respective interrupted cooling channel 9 circumferential sealing ring 8 in a groove and in the Embodiment of Figure 4, two in the respective interrupted cooling channel 9 circumferential sealing rings 8.
• the respective sealing ring 8 has in the piston 1 primarily the task of sealing the respective interrupted cooling channel 9 with respect to the region of the cylinder liner. At least one burning jet impinges on the upper side of the piston crown 17. In the examples, several firing jets strike the top of the piston crown 17 (not shown in FIGS. 1 to 4).
• the other interrupted cooling channel 9 is identical.
• the two interrupted cooling channels 9 are each arranged in the piston 1, that they are arranged in a plane and at the same distance to the piston central axis (in the stroke direction) in the piston 1 at the same distance from each other, so that in the respective embodiments, a symmetrical arrangement results.
• the two interrupted cooling channels 9 each form an angle of approximately 150 ° due to their dimensions.
• the piston 1, which has the two interrupted cooling channels 9, may additionally contain at least one cooling slot and / or at least one cooling bore at the locations where the distance between the two interrupted cooling channels 9 exists. In the example, in each case two cooling slots are introduced at these points to further support the cooling.
• one of the two interrupted cooling channels 9 in the piston 1 is divided in the respective embodiment by a separating element 11 into two areas.
• the one forming region of the cooling channel 9 is a forming pressure chamber 12 which forms between a part of the wall of the cooling channel 9 and a part of the wall of the separating element 11.
• the other, second region in the cooling channel 9 is a cooling channel 9a reduced from the volume compared to the original cooling channel 9.
• the interrupted cooling channel 9 contains only a single separating element 11, which consists of only a single item.
• the partition element 1 1 runs once in the area of the entire interrupted cooling channel 9 around.
• the separating element 11 also contains at least one opening 16.
• the exemplary embodiments each contain a plurality of openings 16, which are each shown in detail in the respective embodiments.
• the separating element may be composed of a plurality of individual parts to form an entire separating element, wherein the separating element then completely circulates in the region of the interrupted cooling channel.
• At least one opening can also be formed by at least two separating elements, so that at least one single opening is formed during the assembly of the at least two separating elements.
• the partition member 11 is made of, for example, an aluminum alloy.
• the separating element 11 is in the example of Figure 1 in the interrupted cooling channel 9 by means of a frictional connection, in the example by means of a screw connection attached.
• a stud bolt 13 is used in the interrupted cooling channel 9 of the piston 1 in the example, which is screwed in the lower part 3 of the piston 1 by means of a thread.
• three stud bolts 13 are preferably used.
• the stud bolt 13 any other type of screw, such.
• the lower part 3 contains at the locations where the respective stud bolt 13 is provided, matching threaded holes.
• the partition element 1 1 further contains at the locations at which the respective stud 13 is positioned below the partition element 1 1, fitting recessed mounting holes 14th
• one of the stud bolts 13 used, which is shown in FIG. 1, is described below.
• the partition member 11 is secured to the top of the stud bolt 13, which is screwed with its underside in the lower part 3 by means of a thread, by means of a nut on this, in which the stud bolt 13 is positioned in the mounting hole 14 of the separating element 11.
• the separating element 11 rests in a region on a surface of the lower part 3, so that a pressure chamber 12 is formed. Another area of the separating element 11 is sealed to the wall of the cooling channel 9 by means of at least one sealing element, preferably by means of at least one sealing ring element 15 and / or at least one hard rubber opposite the reduced cooling channel 9a in the piston 1.
• a single sealing ring member 15 is used for the partition member 11 that seals the pressure chamber 12 between the partition member 11 and the wall of the cooling channel 9.
• the sealing ring element 15 is inserted according to Figure 1 in a groove in the separating element 11.
• the separating element can be sealed against the wall of the cooling channel by means of a hard rubber, which is positioned for example between the separating element and the cooling channel wall in the lower part.
• the surface of the pressure chamber 12 in the piston 1 is by means of a manufacturing process, preferably by means of a machining production process such. As milling and / or grinding, processed to produce a good surface quality before the onset of the separating element 11 to allow a good sealing of the sealing ring member 15 used in the example and a good concern of the separating element 11 on the lower part 3 in the cooling channel 9.
• the pressure chamber 12 is first milled and then ground, so that results in a smooth, high-quality surface.
• the separating element can also be fixed in the cooling channel by means of a further frictional connection, preferably a press connection.
• the separating elements and the wall of the cooling channel form a frictional connection, in which the separating element is for example inserted or pressed in wedge shape into the lower part.
• the separating element can also be fastened in the cooling channel by means of a cohesive connection, preferably by means of gluing and / or welding.
• the separating element is glued to the wall of the cooling channel and / or welded.
• the pressure chamber 12 is supplied with oil by means of a plurality of oil inlet openings, which are located in the lower part 3 of the piston 1 (not shown in FIG. 1).
• the separating element 11 according to FIG. 1 has a plurality of openings 16, which are tubular.
• the separating element 11 has a plurality of tubular attachments which are each arranged at a distance from one another.
• a tubular opening 16 according to FIG. 1 is introduced.
• the respective opening 16 in the form of a bore is in each case not specially processed. Due to the shape of the opening 16, it is possible that the oil is sprayable targeted to the underside of the piston head 18.
• the oil emerging from the pressure chamber 12 is not sprayed into the oil collecting in the reduced cooling channel 9a, since the respective attachment protrudes from the collecting oil in the reduced cooling channel 9a.
• individual openings can also be nozzle-shaped, z. B. in the manner of a venturi nozzle, be formed.
• the pressure of the oil emerging from the pressure chamber is further increased or optimized in relation to the pressure in the case of a normal bore.
• a type of cavity is recessed in the embodiment of Figure 2 and 3, which forms the pressure chamber 12.
• the separating element 11 rests on a hard rubber 20 which revolves in the region of the interrupted cooling channel 9 and which is fittingly inserted in a recess of the interrupted cooling channel 9 in the lower part 3.
• the hard rubber 20 adapts to the contour of the cooling channel 9.
• the cavity is supplied by means of connecting rods or bolts through the lower part 3 and the hard rubber 20 by means of at least one oil inlet opening 21, which passes through both in each case with oil by means of pumping action or injection.
• the piston 1 has a plurality of oil inlet openings 21. In the cavity, a pressure builds up continuously due to the oil added under pressure from the oil inlet openings 21, whereby the new supplied oil flows continuously under a certain pressure and under a certain volume flow into the pressure chamber 12, ie into the cavity.
• a cylinder screw 22 is guided through a fastening opening 14 and through a hole of the hard rubber 20 and screwed with a thread according to FIG.
• the separating element 11 and the hard rubber 20 is firmly connected to the lower part 3 of the piston 1 and a sealed by the hard rubber 20 pressure chamber 12 is formed in the interrupted cooling channel 9.
• the separating element 11 according to FIGS. 2 and 3 has a plurality of slot-shaped openings 16, only one opening 16 being shown in each case in FIGS. 2 and 3.
• the Trenneiement 11 has matching slot-shaped attachments, each having a slot-shaped opening 16.
• the essays each have a depth T.
• the slot-shaped openings 16 are drilled in the example of Figure 2 and Figure 3 respectively in the separating element 11 and the respective attachment.
• the slot-shaped opening 16 in Figure 2 is shown briefly below.
• the slot-shaped opening 16 shown in Figure 2 is in each case with the aid of the article in the interrupted cooling channel 9 with a certain angle section, for example 40 °, in this circumferential.
• a certain angle section for example 40 °, in this circumferential.
• the separating element can also be glued to the hard rubber.
• the hard rubber which adapts to the lower region of the cooling channel can then be glued into the recess in the cooling channel.
• the separating element 11 is frictionally embedded in the lower part 3 of the piston 1 as a part and secured thereto. Between the lower part 3 and the separating element 11, two joining regions 23 are formed.
• the pressure chamber 12 of the separating element 11 is sealed according to Figure 4 with respect to the reduced cooling channel 9a and the cylinder liner by means of the two sealing rings 8, which are positioned in a respective groove in the separating element 11 according to FIG 4. Between a portion of the opposite to the annular grooves 7 wall of the upper part 2 and located in the partition member 11 cavity, the pressure chamber 12 is formed from the oil exiting through at least one opening 16 of the separating element 11.
• the separating element 11 has a plurality of openings 16.
• the openings 16 are in each case suitably introduced into the separating element 11, so that, for example, an opening 16 according to FIG. 4 results in the upper web of the separating element 11.
• the openings 16 are bored respectively in the separating element 11. Due to the depth and shape of the respective borehole results in a tubular opening 16, which passes the leaking oil fitting in the direction of the underside of the piston crown 18.
• the example supplied via connecting rod or bolt under pressure oil by means of pumping or injecting flows through the oil inlet openings 21 into the pressure chamber 12 of the interrupted cooling channel 9. This distributes the oil in the pressure chamber 12.
• the thereby building pressure, preferably a pressure of about 3 bar, in the pressure chamber 12 can continuously oil from the openings 16 of the separating element 11 in the direction of underside of the piston head 18 exit. From each opening 16 occurs while a single beam 19.
• the respective steel 19, due to the tubular shape of the respective opening 16 in the form of a bore is an approximately round jet 19.
• the respective jet 19 is of the type shown in FIG formed a spouting flat oil wall, since the shape of the respective opening 16 according to Figure 2 and 3 is respectively slit-shaped.
• the oil is also injected onto the areas of the bottom of the piston crown by means of the orientation of the respective opening, which are opposite to the regions of the piston crown which are directly exposed to the combustion jet.
• the oil When lowering the piston 1, that is, at an increase in the combustion chamber, the oil is at a higher pressure, that is in the three embodiments each with more than 3 bar, by the inertia of the oil the pressure chamber 12 is guided through the respective opening 16 and accelerated from the openings 16 in the direction of the underside of the piston crown 18.
• the oil that has just been injected into the reduced cooling channel 9a is then removed again via a plurality of outlet openings 10 from the reduced cooling channel 9a.
• the piston may alternatively be formed in a further possible embodiment of the described embodiments as Einauflagenkolben, that is, the piston requires only a single (inner) support surface.
• the bearing surface 4 located in FIG. 1 close to the piston center axis
• the cooling channel in the piston may also be circumferential.
• the separator is then adapted respectively to the cooling channel in shape and size.
• six to eight fastening means such as, for example, stud bolts or cylinder screws, with a suitable number of threads are used for fastening the separating element in the circulating cooling channel.
• the piston may contain only a single cooling channel and the cooling channel of the piston may be interrupted so that the cooling channel forms an angle of less than 360 ° about the piston center axis.
• the separator is then adapted respectively to the cooling channel in shape and size.
• the piston consists of a cast upper part and a separately cast lower part.
• the separating element is also produced by means of a primary molding process, preferably casting, in the respective cooling channel of the respective piston part, in which, for example, the lower part by means of a Casting, for example, sand casting or chill casting, is produced and the separator is cast directly into the base with, for example, the lost core technique.
• the entire piston consisting of upper part and lower part, is cast as a one-piece piston together with the separating element.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Pistons, Piston Rings, And Cylinders (AREA)
• Lubrication Of Internal Combustion Engines (AREA)

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• 2010
  • 2010-07-23 JP JP2012522015A patent/JP2013500425A/ja active Pending
  • 2010-07-23 KR KR1020127001821A patent/KR20120075455A/ko not_active Application Discontinuation
  • 2010-07-23 EP EP10737295A patent/EP2459861A1/de not_active Withdrawn
  • 2010-07-23 WO PCT/EP2010/004535 patent/WO2011012273A1/de active Application Filing
  • 2010-07-23 DE DE102010032173A patent/DE102010032173A1/de not_active Withdrawn
  • 2010-07-23 CN CN2010800325592A patent/CN102575614A/zh active Pending

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