Classifications

• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
  • B21K25/00—Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components
• • 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 
  • F02F3/0084—Pistons  the pistons being constructed from specific materials
  • F02F3/0092—Pistons  the pistons being constructed from specific materials the material being steel-plate
• • 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 piston and a method for producing a two-part piston from an upper part and a lower part, according to the features of the respective preamble of the independent claims.
• EP 1 878 902 A2 describes the construction of a piston comprising an upper part and a lower part, which are supported via joining webs in the region of contact zones and connected to one another. A clamping connection arises here by a rotation of the upper part to the lower part, comparable to a clutch. This is very complicated to handle.
• the piston in particular the cooling channel piston, consists of an upper part and a lower part.
• the upper part can, but does not have to be introduced a cooling channel.
• the upper part comprises the surface facing the combustion chamber of the cylinder, in known per se, the ring field and optionally a combustion bowl.
• the lower part consists of opposite supporting shaft wall sections, connecting walls, which connect the skirt wall sections, wherein in the connecting walls in known per se, the bolt holes are arranged.
• the two parts can be made of the same or different material. If the piston is a cooling channel piston, a cover for the cooling channel can be provided before joining the upper part and the lower part, this cover being provided by joining the two parts to one another Destination is determined.
• the cover can be arranged independently of the clamping process or even if it was clamped by the upper and lower part, by additional measures such. As welding or the like, set at their destination and sealed by these additional measures.
• the two parts can in the same process or in different processes, such. As forging, casting or the like, be prepared.
• the invention is therefore based on the object to abolish the disadvantageous parting plane between the lower part and upper part of a piston.
• the upper part comprises at least one combustion chamber and at least one annular groove.
• a connection in which at least two components to be connected mechanically interlock and because of their geometric shape of the components to be connected in the connection region, the connection remains, is referred to as positive locking. Even if there is no power transmission between the components to be connected or the power transmission between the components to be connected is interrupted, the connection is maintained. Connections with undercut, riveted joints or dovetail joints are, for example, attributed to the positive connections.
• the invention relates to a piston, in particular a cooling channel piston, for an internal combustion engine, with at least one lower part and an upper part, and a combustion chamber and with at least one annular groove, wherein the upper part or the
• Lower part is fixed with at least one undercut on the lower part or on the upper part, wherein the upper part comprises at least one combustion chamber and at least one annular groove.
• the invention provides that the at least one undercut is part of the wall of an opening.
• the undercut can be advantageously prepared in one step with the opening.
• the invention provides that at least one pin engages after forming in the undercut.
• a robust positive connection is created by including the undercut.
• the compound is almost insoluble and can only be solved, if at all, with a very high cost.
• the invention provides that the volume of the pin corresponds almost exactly to the volume of the opening. This ensures that the pin fills the entire, for example, cylindrical opening. This leads to a secure high-strength connection.
• the opening is made almost cylindrical, wherein it has a smaller diameter in the inlet area of the pin than on the opposite side.
• the opening is bounded by a wall which corresponds to the mantle of a truncated cone, the truncated cone pointing to the "tip" in the direction of the peg. "Almost exactly” in this context means that the volume of the peg (ie the volume which is in the opening is to be placed) may be less than or equal to the volume of the opening.
• the invention provides that for closing a cooling channel, at least one closure element, in particular a ring, is provided.
• Such a closure element is in one piece, but may also be multi-part, e.g. from two or more than two parts, be configured.
• the at least one closure element of the geometry of the cooling channel is adapted depending on the shape of the cooling channel. Is the cooling channel rotationally symmetrical (for example, based on the
• Kolbenhubachse is also formed a part of the closure element (or the plurality of parts which form the closure element) rotationally symmetrical. If, however, the geometry of the cooling channel is not rotationally symmetrical (for example oval, elliptical or other geometries), the at least one closure element is correspondingly also adapted, that is also not rotationally symmetrical.
• the invention provides a method for producing a two-part piston, in particular a cooling channel piston, for an internal combustion engine, having a lower part and an upper part, comprising the following steps,
• Supply of the lower part having at least one opening or at least one pin supply of the upper part having at least one pin or at least one opening, wherein the at least one pin under force the undercut of the at least one opening fills.
• the invention provides that at least the at least one pin is heated to a temperature well above room temperature before joining.
• the joining process is supported because the material to be joined is easier to deform.
• room temperature means the temperatures at which the production process of such pistons takes place, ie temperatures that are sustainable for the persons who work in such production halls the at least one pin is heated before joining, thus significantly above this room temperature, at clearly more than 100 degrees Celsius. If cold joining or hot forging takes place as a joining process, it is possible to consider it well above 200 degrees Celsius. For example, in the half-warm forging in the
• the invention provides that at least one annular groove is introduced after the joining in the upper part. Ring grooves are used to accommodate piston rings for use at least one piston in an internal combustion engine.
• Piston. Fig. 3 shows a sectional view of a piston blank
• Figure 1 B shows the upper part 3 with inserted ring 4 and pin 5 before joining the lower part 2.
• Figure 1 C shows the upper part 3 with inserted ring 4 and pin 5 before joining the lower part 2.
• four pins 5 for producing a positive connection between the lower part 2 and upper part 3.
• there may only two Pin 5 or more than four pins 5 are provided.
• the supply of the lower part 2 before joining is shown in FIG. 1C.
• the pins 5 can be heated to a temperature well above the ambient temperature. This supports the subsequent forming process of the pin 5.
• the term "opening" (denoted by the reference numeral 6 in the part of the figure descriptions) is used in the sense that in the upper part (general) and in the upper part 3 (according to FIG 1) in which the pin (general) or reference numeral 5 is introduced and deformed in the description of the figure, whereby the pin is formed by the lower part (general or lower part 2 in the exemplary embodiment) is also that the at least one recess in the lower part and the at least one corresponding pin part of the upper part is essential.
• pin and recess or opening
• pin and recess are coordinated so that the volume of the pin after forming the volume of the By the resulting deformation of the pin "digs" this in the recess, so that dadurc h upper part and lower part are inseparably connected to each other in the sense that they are no longer arranged relatively movable to each other. Only by not occurring in operation and thus unusually high forces, it would be possible to separate lower part and upper part of each

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (5)

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Family Cites Families (10)

• 2014
  • 2014-03-14 DE DE102014204774.9A patent/DE102014204774A1/de not_active Withdrawn
  • 2014-03-14 US US14/776,966 patent/US20160069294A1/en not_active Abandoned
  • 2014-03-14 EP EP14711950.7A patent/EP2971716A1/de not_active Withdrawn
  • 2014-03-14 CN CN201480014631.7A patent/CN105189999A/zh active Pending
  • 2014-03-14 WO PCT/EP2014/055117 patent/WO2014140287A1/de active Application Filing

Non-Patent Citations (1)

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