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 
  • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
  • F02F3/022—Pistons  having means for accommodating or controlling heat expansion the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval
• • 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 
  • F02F3/02—Pistons  having means for accommodating or controlling heat expansion
• • 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
  • 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
• • 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
  • F16J1/005—Pistons; Trunk pistons; Plungers obtained by assembling several pieces
• • 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
  • F02F2200/00—Manufacturing
  • F02F2200/04—Forging of engine parts
• • 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
  • F02F2200/00—Manufacturing
  • F02F2200/06—Casting
• • 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

Definitions

• the invention relates to a piston for an internal combustion engine and a manufacturing method according to the features of the respective preambles of the independent claims.
• DE 10 2009 059 056 A1 relates to a piston for an internal combustion engine, having a piston crown, a circumferential land and a ring groove having annular peripheral part and a piston skirt, which has two skirt walls and two recessed against the ring part, the shaft walls connecting box walls, that in the region of the box walls in each case a freestanding underside of the ring portion is formed, wherein the box walls are provided with hub bores having pin bosses. It is envisaged that at least one support element is arranged between each freestanding underside of the ring section and the box wall assigned to it. These support elements form an elaborate in the production oblique support of the shaft in the hub.
• DE 10 2007 018 932 A1 relates to a piston of an internal combustion engine having a piston ring having a ring field, to which a piston skirt enclosing a piston inner space adjoins with two supporting shaft wall sections and two bolt hubs. Each pin hub including a pin boss is connected via a hub support with a hub body.
• DE 10 2007 018 932 A1 is thus an example of existing piston geometries, which have a retracted in Bolzenachsplatz shaft in the manner of a box piston. In this design, a large wall thickness and thus a high material usage is required to ensure a low deformation caused by the operating loads. In such known box piston design, the problem occurs that during operation of the internal combustion engine by the gas pressure and the ignition pressure so large forces acting on the piston that deformation may occur on the piston.
• a particular disadvantage here is that the ring field only in the region of the shaft walls
• the object of the invention is to simplify the production of a piston and to reduce the mass of the piston with increased stability.
• the solution according to the invention is that a piston of an internal combustion engine with a piston ring having an annular field, to which a piston skirt enclosing an inner mold, with two opposing box walls recessed with respect to the outer contour of the piston and with two opposite the outer contour of the piston non-recessed stem walls, the box walls receiving hubs, the piston skirt having stem supports connected to the hub, the width of the box wall being an intersection between the pin axis and the curvature and tangent continuity of the box wall.
• the shaft support has a concave shape with respect to the plane which is located by a piston stroke axis and perpendicular to the bolt axis.
• a method for producing a piston for internal combustion engines wherein the piston is manufactured by casting or forging process.
• the piston is produced by casting or forging.
• the shaping of the piston according to the invention enables a simplified production in the casting or forging process.
• a piston for an internal combustion engine which has a piston shaft with hubs for receiving the piston connecting the piston with the connecting rod piston pin and shaft supports, which are connected to the hub.
• the shank support has a concave shape with respect to the plane through the piston stroke axis and perpendicular to the bolt axis.
• the shaft support is identical for the pressure and counter-pressure side or can be varied for the respective piston side.
• FIG. 1 shows a section through a piston according to the invention.
• FIG. 1 shows a piston 1 according to the invention.
• This piston 1 has a piston shaft 2 with a shaft support 3.
• the recessed walls are referred to as box walls 4, the other two non-recessed walls are referred to as shaft walls 13 and have the actual running surface of the piston skirt 2 on.
• hubs 6 are integrated with hub bores.
• the box walls 4 and the shaft walls 13 are connected to the underside of a Koibêt 11.
• the box wall 4 has a width b, a diameter d and a wall thickness s. Furthermore, the piston 1 has a box wall arch 5. In addition, the hubs 6 will pass from a pin axis 7.
• the shaft support 3 has a concave shape with respect to the plane passing through a piston stroke axis 8 and perpendicular to the pin axis 7. With r the outer hub radius is designated.
• A describes the axial distance in Boizenraum the Sich ceremoniessringnut 9 and a1 describes the axial distance of the beginning of the supporting length in the direction of the bolt axis. 7
• the points a2a and a2i form intersections between the curvature and tangent continuation of the box wall 4 with the located at the height of the pin axis 7 outer hub radius r.
• the points a3a and a3i form intersections between the curvature and tangent continuation of the box wall 4 and the tangent-shaped continuation of the inner mold 10.
• the inner mold 10 forms a part of the underside of the piston head 11 from.
• a circumferential ring field 12 is arranged on the outer circumference of the piston head 1 1, a circumferential ring field 12 is arranged.
• the ring field 12 experiences in particular by the shaft walls 13 a support.
• the piston 1 has the following features.
• the width b of the box wall 4 is equal to the intersection of the box wall arch 5 with the pin axis. 7
• the direction of the shaft support 3 is described by the points a2i, a3i, a2a and a3a, wherein the points a2i and a2a, the intersections between the curvature and tangentenstetigen continuation of the box wall 4 is located at the height of the pin axis 7 outer hub radius r and the Points a3i and a3a are the points of intersection between the continuation of the box wall 4 in the direction of curvature and tangents and the tangential continuation of an inner mold 10.
• the shaft support 3 is identical for the pressure and counter-pressure side or can be varied for the respective piston side in the ratios a2i I a3i and a2a I a3a.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=51690396

Family Applications (1)

Country Status (8)

Families Citing this family (3)

Citations (4)

Family Cites Families (24)

• 2014
  • 2014-10-13 EP EP14783646.4A patent/EP3058206A1/de not_active Withdrawn
  • 2014-10-13 KR KR1020177037223A patent/KR20180004290A/ko not_active Application Discontinuation
  • 2014-10-13 KR KR1020167012511A patent/KR20160070818A/ko active Search and Examination
  • 2014-10-13 CN CN201480063165.1A patent/CN105745426B/zh active Active
  • 2014-10-13 JP JP2016523241A patent/JP2016535191A/ja active Pending
  • 2014-10-13 DE DE201410114785 patent/DE102014114785A1/de not_active Ceased
  • 2014-10-13 WO PCT/EP2014/071881 patent/WO2015055578A1/de active Application Filing
  • 2014-10-13 MX MX2016004545A patent/MX2016004545A/es unknown
  • 2014-10-13 US US15/028,960 patent/US20160245223A1/en not_active Abandoned
• 2018
  • 2018-08-30 US US16/117,769 patent/US20180372020A1/en not_active Abandoned

Patent Citations (4)

Non-Patent Citations (1)

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