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 
  • F02F3/28—Other pistons with specially-shaped head
  • F02F3/285—Other pistons with specially-shaped head the head being provided with an insert located in or on the combustion-gas-swept surface
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/001—One-piece 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J1/00—Pistons; Trunk pistons; Plungers
  • F16J1/10—Connection to driving members
  • F16J1/14—Connection to driving members with connecting-rods, i.e. pivotal connections
  • F16J1/16—Connection to driving members with connecting-rods, i.e. pivotal connections with gudgeon-pin; Gudgeon-pins

Definitions

• the invention relates to a piston for a
• pistons are used in each case to be moved translationally after the ignition of the fuel mixture and to transmit kinetic energy to the crankshaft via a piston pin and a connecting rod.
• the pistons have a ring field in order to fulfill the requirements placed on them in a region close to the combustion chamber.
• shaft walls are present, which serve the lateral support.
• connection of said functional areas, namely ring field, pin bosses and shaft walls is usually carried out by so-called connecting or side walls, which extend between the shaft walls, each a pin boss
• the invention has for its object to provide a piston for an internal combustion engine, which is further improved in terms of the compression height and / or weight, while the requirements for the piston stiffness must be met.
• Cylinder inner surfaces correspond. Between at least two such support surfaces, a recess is provided which has a (radial) depth of at least 10% of half the distance between two opposing support surfaces. Half the distance between two opposing support surfaces essentially denotes the radius of the male, typically cylindrical piston pin, and the depth of the recess measured in the radial direction of the piston pin is thus of the order of millimeters for conventional piston pin dimensions. This results in other words clear and large windows in places where so far
• the piston pin viewed in the direction of the piston axis, in an upper, ie the ring field nearby area, and a lower, the ring field opposite area, supported.
• the described "windows" can be formed, and it can be bulky be saved.
• a securing groove for a ring for securing the piston pin can be formed only in the areas of the support surfaces described, and it could be found that thereby a sufficient assurance of
• suitable Entformungsschrägen can be designed so that the demolding can be guaranteed in the case of manufacture in suitable casting tools.
• production by forging is conceivable as well, in which case steel is preferred as the material.
• steel is preferred as the material.
• the shaft walls may be wider in the area of their connection to the ring field than in the rest of their "lower" area.
• shaft walls can also be used
• the piston according to the invention is based on the basic idea, the power flow and the required
• the compression height is reduced.
• piston according to the invention combined with a cylindrical piston pin.
• Piston pin a larger angle, in particular 120 ° to 180 °, preferably 150 ° to 170 ° covering as one
• Supporting surface is preferred that it is widened in the direction of the piston axis, so as to allow only a minimal clearance for the connecting rod and its movement.
• Piston pin opposite side is bounded by a strut, at the other, so directed to the shaft wall side also has a recess.
• the usual side walls are replaced by two typically symmetrical struts, which have extensive recesses on both sides, so that the usual side walls are no longer available and their weight can be saved.
• Struts are formed converging towards the ring field.
• the two struts typically present on each side when viewed in the direction of the piston pin axis, are inclined towards each other in the direction of the ring field.
• a particularly good support of the ring field is ensured in the interior of the combustion chamber is limited and in particular a combustion bowl
• the ring is preferably formed as narrow as possible, in particular oval, as this further weight can be saved, and the necessary minimum clearance for the connecting rod and its movement can continue to be guaranteed.
• Fig. 1 is a view of the piston according to the invention in
• Fig. 2 is a side view in a perpendicular thereto
• Fig. 3 is a bottom view of the piston according to the invention.
• the piston 10 in its in the illustration of FIG. 1 upper, directed to a combustion chamber area a ring field 12 and for lateral support better in Fig. 2 to be recognized shaft walls 14.
• the shaft walls 14 are only one in the lower
• Ring provided portion of the piston which additionally carries a first Abracläche 18 for the (not shown) piston pin.
• the conventionally provided between the shaft walls 14 connecting walls are not present. Rather, by first recesses 20, each between the shaft walls 14 and obliquely in the direction of the ring field 12 mutually extending struts 22 extensive weight saved.
• Embodiment covers only an angle of about 60 °. Opposite, so closer to the ring field is a second Support surface 24 is provided, which in the shown
• Embodiment covers a larger angle, for example about 170 °. Between these two Abstützflachen more recesses 26 are provided, which in the embodiment shown a (measured in the radial direction of the piston pin) depth of about 40% of the piston pin radius
• the piston according to the invention can have a cooling channel 32, and that a
• Securing groove 34 for a locking ring can be provided in each case in the region of the support surfaces 18, 24.
• the lower ring 16 can be seen in Fig. 2 and particularly well in Fig. 3 that it is largely oval and as close as possible to the area is taken in which there is a connecting rod in the assembled state.
• the struts 22 it should be added with reference to FIG. 2 that they can be made narrower in a lower region, ie substantially below a piston pin axis, than shown in FIG.
• the struts 22 have a clear extension in the direction of the piston pin axis, and that the reinforcing ribs 30 are in zones are provided, which are relatively close to the piston axis.
• the shaft walls 14 it can be seen in FIG. 2 that they are wider in the area of the connection to the ring field 12 than in their lower area.
• this design can also be reversed or designed with constant width in certain applications.
• ring is shown in addition, which has been described as oval.
• the oval shape can be seen in particular on the inside of the ring. Over wide areas in the vicinity of the piston pin axis, the ring has a

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=51292937

Family Applications (1)

Country Status (9)

Families Citing this family (6)

Citations (1)

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• 2013
  • 2013-08-07 DE DE102013215538.7A patent/DE102013215538B4/de not_active Expired - Fee Related
• 2014
  • 2014-07-30 US US14/910,082 patent/US9945320B2/en not_active Expired - Fee Related
  • 2014-07-30 WO PCT/EP2014/066380 patent/WO2015018712A1/de active Application Filing
  • 2014-07-30 EP EP14747891.1A patent/EP3030773A1/de not_active Withdrawn
  • 2014-07-30 MX MX2016000534A patent/MX2016000534A/es unknown
  • 2014-07-30 KR KR1020167002633A patent/KR102186278B1/ko active IP Right Grant
  • 2014-07-30 CN CN201480044679.2A patent/CN105452639B/zh active Active
  • 2014-07-30 BR BR112016002455A patent/BR112016002455A2/pt not_active Application Discontinuation
  • 2014-07-30 JP JP2016532323A patent/JP6363710B2/ja not_active Expired - Fee Related

Patent Citations (1)

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