EP3129629B1 - Verlängerter kühlkanalzulauf für kühlkanalkolben und verfahren zu seinem betrieb - Google Patents

Verlängerter kühlkanalzulauf für kühlkanalkolben und verfahren zu seinem betrieb Download PDF

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Publication number
EP3129629B1
EP3129629B1 EP15715262.0A EP15715262A EP3129629B1 EP 3129629 B1 EP3129629 B1 EP 3129629B1 EP 15715262 A EP15715262 A EP 15715262A EP 3129629 B1 EP3129629 B1 EP 3129629B1
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EP
European Patent Office
Prior art keywords
piston
cooling channel
thread
tubular element
collar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15715262.0A
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German (de)
English (en)
French (fr)
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EP3129629A1 (de
Inventor
Jochen Müller
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KS Kolbenschmidt GmbH
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KS Kolbenschmidt GmbH
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Priority to PL15715262T priority Critical patent/PL3129629T3/pl
Publication of EP3129629A1 publication Critical patent/EP3129629A1/de
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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
    • F01P3/10—Cooling by flow of coolant through pistons
    • 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
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • 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
    • 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
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Definitions

  • the invention relates to a cooling channel piston for internal combustion engines and a method for regulating the coolant level in the cooling channel according to the features of the respective preamble of the independent claims.
  • Cooling channel piston in which in the piston upper part (also called the piston head), a cooling channel (also called cooling chamber) is arranged, are known.
  • the cooling channel has at least one opening into which a cooling medium is introduced. After this has passed the cooling channel, it leaves the cooling channel at another opening or at the same opening.
  • the DE 10 2011 007 285 A1 relates to a piston for an internal combustion engine having a piston upper part and a piston lower part, an inner, preferably annular cooling channel for cooling the piston during operation of the internal combustion engine and at least one arranged on the piston lower part inlet opening and at least one arranged on the piston lower part outlet opening, via which a coolant flow and outflow into the cooling passage or from the latter, wherein the at least one inlet opening and / or the at least one outlet opening is / are surrounded by an annular bead or a ramp-like elevation, which prevents a lowering of a coolant level below a predefined level, and which is integral with the piston lower part is trained.
  • WO2010 / 009779 A1 shows an alternative solution.
  • the object of the invention is therefore to be able to adjust the coolant level in a wider range and to provide a method for adjusting the coolant level in the cooling channel.
  • a piston in particular for an internal combustion engine, having a piston lower part and a piston upper part, an inner, preferably annular cooling channel and at least one inlet opening arranged on the piston lower part and at least one outlet opening arranged on the piston lower part, via which a coolant inflow and outflow into the cooling channel or takes place from this, wherein the at least one inlet opening and / or the at least one outlet opening is / are formed by a passage and this is formed integrally with the piston lower part, wherein the at least one passage has a thread into which at least one tubular element is inserted.
  • any desired elements can be screwed into the piston, for example tubular elements through which coolant can flow.
  • a subsequent assembly can take place with regard to the coolant level in the cooling channel of the piston. The pistons in question can be made equal to this step.
  • the at least one passage terminates flush with the surface of a cooling passage wall.
  • the at least one passage has at least one collar.
  • a gain of the thread to be introduced there is achieved.
  • the at least one collar is formed on the side facing the bolt holes side of the cooling channel wall.
  • the at least one passage can be created on the piston connected from the lower piston part and upper piston part.
  • the at least one collar is formed on the side facing away from the bolt holes side of the cooling channel wall and thus protrudes into the cooling channel. As a result, a minimum coolant level is achieved in the cooling channel.
  • the at least one tubular element terminates flush with the at least one passage or with the collar of the at least one passage.
  • the tubular element serves the better supply of coolant to the cooling channel, but not to influence the coolant level in the cooling channel.
  • the at least one tubular element protrudes into the cooling channel beyond the at least one passage and / or the collar of the at least one passage.
  • the penetration depth of the tubular element into the cooling channel influences the level of the coolant in the cooling channel.
  • the at least one tubular element projects beyond the at least one thread in the direction opposite to the cooling channel.
  • the tubular member of the better supply of coolant to the cooling channel for example, the coolant can be conveyed by means of a nozzle directly into the tubular member.
  • the direction away from the cooling channel end of the at least one tubular element is funnel-shaped.
  • a funnel-shaped construction of the tubular element increases the absorption of injected coolant from the nozzle. Due to the funnel-shaped configuration of the tubular element tolerances of the oil jet can be compensated. If the oil jet is fanned out, however, it is still possible to choose between upper and lower dead center during the up and down movement of the piston almost the entire or preferably the entire volume flow are passed into the cooling channel.
  • a method for regulating the coolant level in a cooling channel of a piston, in particular for internal combustion engines, which has at least one inlet opening and / or outlet opening in the cooling channel formed by at least one passage, wherein the coolant level in the cooling channel via an adjustable tubular Element is set.
  • the passage to form the at least one inlet opening and / or outlet opening is created by flow drilling.
  • Flow drilling produces no chips and is thus ideal for use in the production of pistons, since the use of the piston in an internal combustion engine, each chip would jeopardize the operation of the internal combustion engine.
  • the thread in the passage which forms the at least one inlet opening and / or outlet opening is formed by tapping.
  • Thread cutting is a manufacturing technology known and mastered process. Therefore, thread cutting is an alternative to thread forming.
  • Thread forming is the ideal connection step for flow drilling, since no chips are formed during thread forming or during flow drilling.
  • the regulation of the coolant level via the screw-in length of the tubular element takes place in a thread located in the cooling channel.
  • the screw-in length here refers to the length of the tubular element projecting beyond the passage or the collar of the passage into the cooling channel.
  • the tubular element serves for the transport of coolant.
  • the supply and / or discharge of coolant to the cooling channel can take place. They can be tailored in their shape to the particular application.
  • the piston in question is also referred to as a cooling channel piston and may consist of at least two piston parts, for example a piston lower part and a piston upper part, which are assembled by a non-positive, positive and / or cohesive joining process to form a piston.
  • the piston with piston lower part and piston upper part can also be produced in one piece in a production process, for example a casting process, in which case the working step for joining the piston lower part and piston upper part is omitted.
  • To produce the cavities for example, sand cores are used in a casting process, and these can be rinsed out after the casting process by specially provided openings. These openings are closed after rinsing.
  • the temperature of the flow drill increases very quickly, for example, about 650 ° to 800 ° C, the cooling channel wall, for example, locally to about 600 ° C.
  • the first displaced from the cooling duct wall material initially flows counter to the feed direction upwards, with increasing penetration depth of the actual draft is then generated in the feed direction.
  • the ratio between material flowing upwards and downwards is for example about 1/3 to 2/3. This varies with the diameter of the drill and the thickness of the material, and may be less (e.g., 1/4 to 3/4).
  • flow drilling also known as flow forming, flow-hole drilling or flow-hole forming
  • flow drilling is an advantageous chipless method for producing passages on pistons, in particular on pistons for internal combustion engines.
  • the material is not removed, but displaced by means of force and friction heat, bead-shaped and formed into a kind of bushing or passage on the piston and thus the formation of chips is avoided.
  • the displaced and bulged raised piston material can be formed into a collar or removed.
  • the generated stable bushes or passages are caused by material displacement and not by erosion. This homogeneous deformation causes not only an additional material consolidation, but also a considerable time and material savings.
  • the shape and diameter of the passage formed on the piston are determined by the dimension of the cylindrical part of the flow drill.
  • the displaced material is advantageously used for the design of the area around the passage opening of the flow drill.
  • the stability to the component received in the thread for example a tubular element, is increased.
  • the depth of engagement has an influence on the stability of the connection between the receiving piston and the screwed-in element, for example a tubular element.
  • the danger of Damage forms, crater eruption, thread forming and / or thread shear are reduced by an increased by a collar on the passage in a piston screwing depth.
  • the screw-in depth is the length on which the component received by the thread in the piston, for example a tubular element and the internal thread, actually engage in a load-bearing manner. Only in the area of ideal screwing depth is a thread considered to be fully supporting. The outgoing threads are not to be considered in the sense of carrying capacity as equivalent to the intervening fully supporting threads. Therefore, length deductions are made from the physically carrying depth of engagement, which results in the ideal screwing depth.
  • a collar formed by flow drilling on the piston advantageously increases the number of threads on the connection in the piston, such as the connection between the piston and a tubular member. With end influences the weakening of the load capacity at the outlets of internally threaded member and threaded component is referred to.
  • the load bearing capacity of the thread is increased in the piston by forming a collar on the passage on the piston, produced by flow drilling, in relation to a conventionally produced opening, for example by drilling or pouring.
  • the application of the flow-drilling method to pistons leads, in addition to the aforementioned advantages, inter alia to the following advantages.
  • the use of the flow-drilling method in pistons produces stable passages or bushes for receiving screw connections, such as tubular elements through which coolant can flow.
  • diagonal flow drilling is possible, in which case the center axis of the flow bore or of the resulting draft deviates from the vertical line formed by the piston stroke axis at an acute or obtuse angle.
  • Flow drilling is a chipless production method, connecting elements are not necessary. Flow drilling involves a great deal of time, labor and material savings as no additional components are required.
  • the production of passages on the piston takes place in only one operation.
  • Flow drilling is a completely automatable process with minimal set-up times. For joining components, such as tubular members, no riveting and welding nuts are required.
  • the flow drilling process offers more safety through homogeneous deformation, thus increasing the service life of the piston.
  • Flow drills have a long service life and produce excellent surface qualities. There are no waste and disposal costs because it is a non-cutting process. Furthermore, chips do not endanger the operational reliability of the piston in the internal combustion engine in a particularly advantageous manner. Thus, a lesser failure of products is noted.
  • Flow drilling therefore offers high process reliability through durable carbide tools.
  • Flow drills are solid carbide tools with a polygon contour. With high speed and axial force pressed against thin-walled metallic materials, they generate extreme frictional heat. As a result, the material of the cooling channel wall can be plastified locally at the flow drilling position. The flow drill is guided through the cooling channel wall within a few seconds. This results in a draft or a bushing from the starting material without loss of material. The length of this socket can be about three to five times the original material thickness. The maximum material thickness to be machined is proportional to the core hole diameter of the flow drill. Depending on the core hole diameter, between 0.5 mm (with optimum relining) and 12 mm (requires very high spindle power) strong material can be machined. Depending on the thickness and quality of the material, approximately 5,000 to 10,000 holes can be created with a flow drill.
  • the non-cutting bushing or pass-through production causes a material cold solidification of the material to be machined and the cold rolled thread strengthens the threads in addition.
  • any conventional threading device can be used. It should be noted, however, that a higher rotational speed (3 to 10 times the process speed) is used.
  • thread forming can also be worked with a hand drill. This should have right or left rotation and enough power.
  • Hand drills are hand-held drills. They are depending on the design for flow drilling and / or thread forming in different materials such as metal or metal alloys of a piston suitable.
  • a common feature of all hand drills is the ability to use flow drills and other rotating tools, such as thread formers, in a front mounted drill chuck.
  • the most important distinguishing feature for hand drills is the type of energy supply, which can be done manually by hand with the help of muscle power, electric, hydraulic or pneumatic.
  • Such hand drills can preferably be used for the production of piston small series.
  • any number of pistons desired by the customer may be provided with flow-generated passages and threaded threads.
  • Thread forming is a non-cutting process and thus advantageously complements the flow-drilling method. Since chips do not form in this production step, they can not later endanger the operation of the piston in an internal combustion engine. In tapping, an increase in productivity is achieved through a higher process speed.
  • the connection produced by thread forming in the piston is highly resilient and has an exact thread guide. For example, a special TiN coating can increase the service life. Furthermore, the length and wall thickness of the passage produced in the flow-drilling process are completely retained.
  • the thread forming process is also a completely automatable process. Existing equipment can be used since the thread forming method can be used on all conventional thread cutting devices.
  • thread forming in conjunction with flow drilling has enormous advantages.
  • the previous semi-warm displacement of the material during flow drilling and the subsequent cold rolling during thread forming cause a strong solidification of the material of the cooling channel wall. This ensures highly resistant threaded connections.
  • the non-cutting thread former causes a significant increase in productivity due to the very high cutting speed and extremely long tool life.
  • the opening which is supplied to the cooling medium, is aligned in the direction of a cooling oil nozzle, wherein from the cooling oil nozzle, the cooling medium is sprayed in the direction of the opening.
  • Care must be taken during the assembly of the cooling channel piston in the cylinder of the internal combustion engine and during operation that during the oscillating up and down movement of the piston in the cylinder chamber of the cooling oil nozzle leaving cooling oil jet exactly hits the opening on the underside of the piston inner region, so that Cooling oil can enter the cooling channel.
  • the cooling channel is realized, for example, in a manner known per se during casting of the cooling channel piston with the aid of a lost core, wherein at least one opening, for example a bore, is introduced from the inner area of the piston, in order to reach the lost core and flush it out ,
  • an extended feed is realized as an additional bore in the actual piston.
  • a thickening is usually poured or formed in the area of the piston neck, whereby this thickening is then bored out.
  • This extended inlet opening from the inside of the piston in the direction of the hypermola has the advantage that the cooling medium injected or introduced into this inlet can be better guided and more selectively deflected into the cooling channel and circulated there.
  • the invention is based on a cooling channel piston in which after the production of the cooling channel piston in any way a cooling channel (or more cooling channels or sections or the like) is provided in the piston head, wherein approximately below the plane in which the piston head downwards considered ends (ie above the pin bore or the apex of the bolt), which is at least one opening for the inlet of the cooling medium.
  • a cooling channel or more cooling channels or sections or the like
  • Such a piston which forms the basis for the invention, thus has no thickening on the piston hub, which is cast and molded and then drilled.
  • a component is arranged at the inlet opening, which forms an extended cooling channel inlet (or an extended cooling channel outlet).
  • This component is in one piece or can also be realized from several components.
  • the at least one component consists for example of a steel material (for example sheet metal), plastic, a composite material or a light metal material and may be e.g. in the form of a widening or tapered tubular member or tubular element are produced inexpensively.
  • the connection can be made by a simple attachment method such as screws, gluing, stapling, positive locking, clipping, soldering, welding, shrinking or pressing or the like.
  • the component can be designed so that it protrudes into the interior of the cooling channel inlet, that is, beyond the plane in which the inlet or discharge opening is located.
  • the resultant projecting into the cooling channel collar prevents advantageously a return flow from the cooling medium in the direction of the component. This means that it is ensured that always remains a certain amount of cooling medium in the cooling channel during the oscillating up and down movement of the piston in the cylinder of the internal combustion engine. This can absorb heat from the surrounding areas of the piston crown and is mixed by the shaker effect with incoming fresh cooling medium and can thereby dissipate heat improved.
  • the filling of the cooling channel piston can be significantly improved with cooling medium, especially at the bottom dead center. Measurements have shown an improvement of 60% not only in the filling, but also in the heat dissipation.
  • any piston having a cooling channel, wherein the cooling channel itself has at least one drain and / or inlet opening to equip them with the invention extended cooling duct inlet and outlet.
  • an extended cooling passage inlet to be realized by one or more additional components on the piston.
  • the extended cooling channel inlet is to be provided as an additional component (s) for pistons for an internal combustion engine, for example as a tubular element.
  • the invention makes it possible to significantly improve the filling of the cooling channel. It is a cheaper production possible.
  • An extended inlet is previously realized as an additional hole in the actual piston. It is cast or formed in the piston material, a thickening of the piston hub, which is then drilled. This has been the state of the art in aluminum pistons for many years, here the bore can be cast.
  • the invention achieves a more cost-effective production of the extended cooling passage inlet, especially in pistons which are not cast.
  • the connection from the piston skirt to the hub is more cost-effective, since no material has to be provided for later drilling.
  • a reduction of the piston weight or the mass of the piston is possible.
  • the piston is designed in the conventional design, that is, the thickening is forged and then we drilled the extended feed.
  • Electrochemical removal (English: Electro Chemical Machining, ECM) is an abrasive manufacturing process especially for very hard materials, assigned to the separation. ECM is suitable for simple deburring to the production of openings on pistons.
  • top, bottom, left, right, front, back, etc. refer exclusively to the example representation and position of the device and other elements selected in the respective figures. These terms are not intended to be limiting, that is to say that different positions and / or mirror-symmetrical design or the like may change these references.
  • FIGS. 1A . 1B . 2 . 3A . 3B . 4 . 5 . 6 and 7 show a piston 1 or components of the piston 1 in the form of a piston lower part 2 and / or a piston upper part 3.
  • the following description of the figures deals with the overarching features of the piston in question. 1
  • the piston lower part 3 has at least one pin bore 4. Furthermore, the piston 1 has a radially encircling cooling channel 5 behind an unspecified ring field 7. This cooling channel 5 is bounded in the direction of the bolt holes 4 by a cooling channel wall 6.
  • the piston upper part 3 has a combustion bowl 8. The combustion bowl 8 can, but does not have to be present.
  • the piston 1 moves in the direction of a piston stroke axis 9.
  • the piston lower part 2 and the piston upper part 3 are joined to form a piston 1, by a material connection. Welding, in particular friction welding, is suitable for integral joining.
  • FIG. 2B shows the piston part 2 before joining the piston 1
  • the FIG. 2A shows the piston upper part 3 before the joining of the piston. 1
  • the cooling channel wall 6 has at least one passage 12.
  • This passage 12 is provided with a collar 13 (see Figures 1A . 1B . 3A, 3B . 6 and 7 ).
  • the at least one passage 12 serves as at least one inlet opening and / or the at least one outlet opening for coolant.
  • the at least one passage 12 is provided with a thread 14.
  • a straight tubular member 15 (of the same diameter) or at least one side widened tubular member 115 (funnel-shaped, with at least partially variable diameter) are introduced.
  • this tubular elements 15, 115 takes place inflow and / or outflow of coolant to / from the cooling channel 5.
  • the level of the coolant in the cooling channel 5 can be adjusted.
  • X denotes the distance between the cooling channel wall 6 and the opening located at the end of the tubular elements 15, 115.
  • Y is the distance between the collar 13 and the end of the tubular elements 15, 115 lying opening.
  • the level of the coolant in the cooling channel 5 is set by the smallest value of X.
  • the level of the coolant in the cooling channel 5 is determined by the position of the outlet opening 11 in the cooling channel 5.
  • the end opening of the tubular elements 15, 115 located in the cooling channel 5 can thus function as inlet opening 10 and / or outlet opening 11.
  • the tubular elements 15, 115 At the outer circumference, the tubular elements 15, 115 at least in a partial area a thread. This thread is made in such a way that it can be screwed into the thread 14.
  • a very precise adjustment of the inlet opening 10 and / or outlet opening 11 in the cooling channel 5 is made possible.
  • the coolant level in the cooling passage 5 of the piston 1 can be accurately set to the later use. It allows a piston 1 with different coolant levels to be offered on the market.
  • a straight-shaped tubular element 15 or alternatively a tubular element 115 widened at least on one side can be installed.
  • the piston 1 is therefore variable in the amount of coolant provided during operation in an internal combustion engine.
  • a tubular element 15, 115 can be used.
  • the at least one side widened tubular element 115 is particularly suitable for receiving a sprayed through nozzles coolant jet.
  • FIG. 1A shows the piston 1 with two tubular elements 15.
  • Die FIG. 1B shows a piston 1 with a at least one side widened tubular member 115. After the adjustment of the tubular elements 15, 115, these can be positively or materially fixed. The fixation can take place, for example, on the passage 12 or on the cooling channel wall 6.
  • FIGS. 3A and 3B show a piston lower part 2 in the manufacture of a passage 12 in the region of the cooling channel wall 6 by means of a flow drill 18.
  • the passage 12 is here almost completed, since the collar 13 is already fully formed.
  • FIG. 4 shows the piston 1 according to the FIGS. 2A (Piston upper part 3) and 2B (lower piston part 2) after the implementation of a cohesive joining process, in particular a friction welding process. At the seams 16, 17 Sch spawulste are formed.
  • FIG. 5 shows a piston 1 composed of piston lower part 2 and upper piston part 3 during the action of flow drills 18 on the cooling channel wall 6.
  • the flow drilling method can be applied to the piston lower part 2 before joining (see FIGS. 3A and 3B ) or after joining (see Fig. 5 ) be applied.
  • the collar 13 is formed on the side facing the bolt holes side of the cooling channel wall 6 (see FIGS. 3A and 5 ).
  • the formation of a collar within the cooling channel 5 is not required, through the use of the tubular elements 15, 115, the level of the coolant in the cooling channel 5 can be adjusted freely.
  • the collar 13 unfolds its Gewindevereverinrnde effect regardless of whether it is arranged on the at the bolt holes 4 facing side of the cooling channel wall 6 or on the side facing away from the bolt holes 4 side of the cooling channel wall 6.
  • the processing of the cooling channel wall 6 by flow drilling and subsequent threading can also be done on from piston bottom 10 and piston top 11.
  • the combination of flow drilling and tapping may be performed on a one-piece forged or cast piston.
  • FIG. 6 shows schematically the creation of the thread 14 in the passage 12 by a thread forming method.
  • a thread former 19 acts to produce the thread 14 a.
  • FIG. 3A . 5 . 6 and 7 show the parallel creation of two passages 12 and two threads 14, it should be noted, however, that only a passage 12 and a thread 14 can be created, as in the FIG. 3B shown. Also, more than two passages 12 can be formed with threads 14 on the piston 1, for example, on a cooling channel wall 6 of the cooling channel 5. Also, not shown here, central cooling space can be provided with at least one passage and at least one thread.
  • FIG. 7 shows a piston 1 after the production of passages 12 with threads 14th
  • the in the FIGS. 8A to 8G schematically illustrated flow drilling process comprises the following steps.
  • the in Figure 8A illustrated first step includes placing the tip of the flow drill 18 on the cooling channel wall. 6
  • the Figures 8B and 8C show the preheat.
  • the flow drill 18 is pressed with high axial force and speed on the cooling channel wall 6, whereby the necessary frictional heat generated and their material is heated.
  • the flow drill 18 can now penetrate into the material and form the passage 12.
  • the third step will be in the FIGS. 8D to 8F illustrated and includes the forms.
  • the flow drill 18 displaces the material of the cooling channel wall 6 initially counter to the feed direction upwards. With increasing penetration depth of the passage 12 is then generated in the feed direction.
  • the ratio between the up and down flowing material is about 1/3 to 2/3.
  • FIG. 8G shows the fourth step, the shaping.
  • the flow-formed passage 12 is ready.
  • the material flowing upwards of the cooling channel wall 6 has been converted into a homogeneous collar 13 or bead.
  • the flow drills required for this purpose are usually referred to as type "mold” or "standard”.
  • the upflowing material of the cooling channel wall 6 was removed directly again.
  • the flow drills required for the removal are usually referred to as "cut” or "flat” type. If the collar 13 has been almost removed or removed, it is still advantageous to provide a tubular element 15, 115 in the thread 14 formed in the passage 12. It can also be two tubular Elements 15, 115 are introduced into a thread 14, wherein they preferably abut each other within the threads.
  • FIGS. 9A to 9H show embodiments of passages 12 with collars 13, produced by different types of tools.
  • FIG. 9 schematically shows the preparation of the thread 14 by thread forming.
  • the process flow during thread forming is as follows.
  • threads The preparation of the thread 14 by thread-forming is referred to as threads, this presses the thread former 19, the material of the passage 12 in the thread flanks and causes by a non-cutting cold forming a structural compaction.
  • threads a very high strength of the thread 14 and an exact thread guide is achieved.
  • a highly resilient connection has been created by the continuous course of the material in the threads and the cold rolling of the thread forming. Due to the exact thread guide there is no risk of intersecting.

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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)
EP15715262.0A 2014-04-09 2015-04-09 Verlängerter kühlkanalzulauf für kühlkanalkolben und verfahren zu seinem betrieb Active EP3129629B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL15715262T PL3129629T3 (pl) 2014-04-09 2015-04-09 Przedłużony dopływ kanału chłodzenia dla tłoków z kanałem chłodzenia i sposób jego działania

Applications Claiming Priority (2)

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DE102014206877 2014-04-09
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DE102018203411A1 (de) * 2018-03-07 2019-09-12 Federal-Mogul Nürnberg GmbH Kolben für einen Verbrennungsmotor sowie Verfahren zur Herstellung eines Kolbens
EP3953576A1 (de) * 2019-04-09 2022-02-16 KS Kolbenschmidt GmbH Kühlkanalkolben mit einem trichterförmigem zulauf in den kühlkanal
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JP2017514059A (ja) 2017-06-01
CN106662034A (zh) 2017-05-10
EP3129629A1 (de) 2017-02-15
US20170030291A1 (en) 2017-02-02
JP6373404B2 (ja) 2018-08-15
WO2015155309A1 (de) 2015-10-15
MX2016013321A (es) 2017-01-18
US9989008B2 (en) 2018-06-05
DE102015206375A1 (de) 2015-10-15
PL3129629T3 (pl) 2018-11-30
CN106662034B (zh) 2019-07-23

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