EP0758715A1 - Piston pour moteur diesel - Google Patents

Piston pour moteur diesel Download PDF

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Publication number
EP0758715A1
EP0758715A1 EP96610030A EP96610030A EP0758715A1 EP 0758715 A1 EP0758715 A1 EP 0758715A1 EP 96610030 A EP96610030 A EP 96610030A EP 96610030 A EP96610030 A EP 96610030A EP 0758715 A1 EP0758715 A1 EP 0758715A1
Authority
EP
European Patent Office
Prior art keywords
piston
ribs
central
bores
cylindrical
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.)
Ceased
Application number
EP96610030A
Other languages
German (de)
English (en)
Inventor
Jorn Dragsted
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dampskibsselskabet AF 1912 AS
Dampskibsselskabet Svendborg AS
Original Assignee
Dampskibsselskabet AF 1912 AS
Dampskibsselskabet Svendborg AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dampskibsselskabet AF 1912 AS, Dampskibsselskabet Svendborg AS filed Critical Dampskibsselskabet AF 1912 AS
Publication of EP0758715A1 publication Critical patent/EP0758715A1/fr
Ceased legal-status Critical Current

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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
    • 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 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • 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
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F05C2201/0448—Steel

Definitions

  • the invention relates to a piston for diesel engines and comprising several parts interconnected by means of welding, and which is adapted to transfer combustion forces to a piston rod.
  • Non-processed inner surfaces suffize for a number of purposes, but as a demand arises for an increased performance of the engine, the requirements to the nature of the surface and the quality of the material are intensified too so as to ensure the best possible heat transmission and fatigue strength.
  • the piston tops cast integral with rib supports will be expensive to manufacture.
  • the object of the invention is to provide a piston which is suited for use especially for large two-stroke diesel engines, and which is relatively inexpensive to manufacture.
  • the piston according to the invention comprises a central integrally shaped part which is adapted to be permanently connected to the piston rod, and which comprises a cylindrical central wall extending coaxially with the central axis of the piston, said integrally shaped part further comprising ribs projecting radially from the central wall and extending in substantially radial planes including the central axis of the piston, as well as a piston top extending as an end wall for the cylindrical central wall and the spaces between the radial ribs to the area adjacent the outer ends of said ribs, and that the piston comprises an outermost cylindrical part provided with outer circumferential annular grooves for receiving sealing rings, said outermost cylindrical part at the upper end being connected to the outer periphery of the piston top by way of welding.
  • the resulting piston is structured in a simple manner and with parts which can be processed to a desired extent and subsequently interconnected by way of welding, such as by way of electron beam welding.
  • the central part transfers the combustion forces to the piston rod partly through the cylindrical support adjacent the centre and partly through the ribs projecting radially therefrom and associated with the piston top.
  • the extent, the thickness, and the number of the radial ribs are adjusted to the expected load on the engine.
  • the acceptable thickness of the piston top can be obtained by a processing by means of conventional cutting tools, and the chips can be easily removed. In addition, it is easy to check the quality of the material everywhere because the access conditions are fine.
  • the piston is made of an integrally shaped central part and an outer cylindrical part which are subsequently welded together by way of for instance electron beam welding, it is possible to use various types of materials for the manufacture of the individual members.
  • the outermost cylindrical part can be made of a curable material, such as unalloyed steel with a high content of carbon, while the central part can be made of a comparatively more heat--resistant material, such as a particular alloy, for instance Cr-Mo-steel.
  • the outermost cylindrical part is not made of a sufficiently wear-resisting material, the surface in the circumferential annular grooves are suitably coated with chromium.
  • the two parts can, however, also be made of the same material and consequently be welded together by way of a conventional welding.
  • pistons with inner channels for a circulation of a coolant It is also known to manufacture pistons with inner channels for a circulation of a coolant. Unlike the conventional, non-processed ribbed pistons with an integrally cast piston top it is by means of the piston according to the invention possible to carry out an efficient cooling of the top when a guide plate according to the invention is secured in each rib space, said guide plate defining an upper cooling chamber adjacent the piston top, and the inner end of each of these cooling chambers communicate openly with the interior of the central wall by means of through bores therein, and the lower end of the outermost cylindrical part comprises closing means for sealingly closing the area around the central part to the surroundings.
  • Such guide plates ensure an efficient cooling of the rear side of the piston top.
  • the guide plates are suitably secured to the ribs by way of welding or by means of screws.
  • the combination of radial ribs primarily being carrying, but also heat-conducting ensures optimum flow conditions for the heat-transferring coolant and allows a manufacture of a the piston top with minimum thicknesses in the material.
  • the closing means is suitably formed by a piston skirt serving to control the piston in a surrounding lining.
  • the ribs may be provided with bores extending from the interior of the central wall to the outer ends of the ribs and being adapted to carry coolant to or away from the outer ends of the upper cooling chambers.
  • bores may according to the invention be provided in the piston rod for guiding the coolant away from the interior of the piston.
  • the piston rod is particularly advantageously provided with a central, axial opening, in which a guiding means is mounted for guiding the coolant to and away from the respective sets of bores.
  • a circumferential cylindrical ring according to the invention being mounted at the outer ends of the ribs, the upper end of said circumferential cylindrical ring flushing with the outer ends of the end plates and being sealingly connected thereto as well as to the intermediary parts of the ribs, and by the ring being provided with an opening opposite each bore in the ribs.
  • the guiding means may according to the invention comprise a pipe arranged coaxially within the piston rod and being provided with a circumferential flange, said guiding means abutting by said flange the inner side of the cylindrical central wall of the central part between the respective sets of bores.
  • the piston shown in Figures 1 and 2 is designated the general reference numeral 1 and comprises a central part designated the general reference numeral 2, and an outermost cylindrical part designated the general reference numeral 3.
  • the central part 2 comprises a cylindrical central wall 4, from which radial ribs 5 extend substantially along radial planes including the central axis 6 of the piston.
  • the central part 2 comprises a piston top 7 forming an end wall for the cylindrical central wall 4 and the spaces between the ribs 5.
  • the piston top 7 extends to the area adjacent the outer ends of the ribs 5.
  • the piston top is almost cup-shaped in a manner known per se with a recess at the centre towards the piston rod side.
  • the cylindrical central wall 4 is shaped integral with the radial ribs 5 and the piston top 7,as said parts are manufactured by way of casting or forging of a suitable material and processed according to desired.
  • Guiding plates 8 are secured between the ribs 5, said guiding plates extending substantially parallel to the piston top 7. These guiding plates 8 are secured in a manner not described in greater detail by way of welding or screwing and define an upper cooling chamber 9 accommodated between the piston top 7 and the individual guiding plates 8.
  • Each cooling chamber 9 is connected to the inner side of the cylindrical central wall by means of a through bore 10 and is besides open to the area around the ribs at the outer ends of the guiding plates 8, when seen in the radial direction.
  • a bore 11 is furthermore shaped through each rib and extends from the inner side of the cylindrical central wall 4 at the end farthest away from the piston top 7 to an area adjacent the guiding plates 8, but on a level therebelow when seen in a direction away from said piston top 7.
  • the central part 2 is secured to the outermost cylindrical part by way of electron beam welding at 12.
  • the outermost cylindrical part 3 comprises circumferential grooves 12, 13, 14, 15, and 15', where sealing rings 16, 17, 18 and 18' are arranged in the latter four grooves in a manner known per se.
  • the uppermost groove 12 serves to be engaged by a lifting device.
  • the outermost cylindrical part comprises a circumferential recess 19 in the inner wall.
  • the piston 1 is secured to the end of a piston rod 20 through the central part 2 in such a manner that the central cylindrical wall 4 and the ribs 5 directly abut said piston rod 20 and are supported thereof.
  • the ribs 5 are shaped with an axially projecting protrusion 21 at their outer ends for the abutment against the external periphery of the piston rod 20.
  • the securing to the piston rod can be carried out in a conventionally known manner by means of bolts, which is diagrammatically shown at 22.
  • the outermost cylindrical part is provided with an annular piston skirt 23.
  • This piston skirt 23 serves furthermore as a closing means secured by means of bolts 24 and sealingly abutting the external periphery of the piston rod 20.
  • a sealing ring 25 is provided between the closing means 23 and the piston rod 20.
  • the closing ring 23 is dimensioned such that in use it guidingly abuts the inner side of the cylinder.
  • the piston rod 20 is provided with a central, axial opening 26, in which a tubular guiding means 27 is arranged.
  • the tubular guiding means 27 extends coaxially to the piston rod, and at the upper end this guiding means 27 is provided with a flange 28 welded thereon for the securing of said guiding means 27 onto a number of projections 29 shaped at the end of the piston rod 20 around and along the rim of the opening 26.
  • projections 29 are arranged such that a free passageway exists between said projections 29 into the bores 11 through the ribs 5.
  • the guiding means 27 is secured to the piston rod by means of bolts 30 and sealingly abuts the inner side of the central cylindrical wall 4 in the area between the openings into the two sets of bores 10 and 11 mutually separated in axial direction.
  • the flange 28 comprises a circumferential recess 31 for receiving the projections 29.
  • coolant is carried to said piston through the piston rod 20 along the outer side of the guiding means 27, such as indicated by means of an arrow 32. Subsequently the coolant flows as indicated by means of an arrow 33 through the bores 11 to the inner side of the outermost cylindrical part 3 at the recess 19. Then the coolant flows as indicated by means of an arrow 34 upwards and towards the piston top 7 and then backwards and radially inwards as indicated by means of the arrow 35 through the cooling chambers 9 so as finally to flow through the bores 10 and into the interior of the central part 2. The coolant flows out of the central part 2 through the interior of the guiding means 27, cf. the arrow 36.
  • the described guiding of the flow of coolant ensures that the parts of the piston being subjected to the highest temperatures, i.e. the area around the periphery of the piston top 7, are quickly supplied with fresh coolant, which in turn is quick removed again in such a manner that a good cooling and consequently a possibility of using a particularly thin piston top 7 is ensured.
  • a circumferential cylindrical ring 38 can be mounted along the outer periphery of the ribs.
  • This ring 38 is sealingly connected to the guide plates 8 at its upper end adjacent the piston top 7.
  • the ring 38 is provided with openings 39 opposite the bores 11 through the ribs 5.
  • This ring 38 ensures both an additionally efficient guiding of the flow of coolant to the cooling chambers 9 immediately below the piston top 7, and a simple mounting of the guide plates because said plates can be connected to said ring 38 for the mounting between the ribs 5.

Landscapes

  • 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)
EP96610030A 1995-08-11 1996-08-12 Piston pour moteur diesel Ceased EP0758715A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK902/95 1995-08-11
DK90295A DK172217B1 (da) 1995-08-11 1995-08-11 Stempel til dieselmotorer

Publications (1)

Publication Number Publication Date
EP0758715A1 true EP0758715A1 (fr) 1997-02-19

Family

ID=8098827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96610030A Ceased EP0758715A1 (fr) 1995-08-11 1996-08-12 Piston pour moteur diesel

Country Status (2)

Country Link
EP (1) EP0758715A1 (fr)
DK (1) DK172217B1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001088350A1 (fr) * 2000-05-17 2001-11-22 Baschieri & Pellagri S.P.A. Modele ameliore de moteur deux-temps a combustion interne a rendement accru et faible niveau d'emission de gaz polluants
DE10047258A1 (de) * 2000-09-23 2002-04-18 Ks Kolbenschmidt Gmbh Kolben mit sich am Basisteil abstützenden und angeschweißtem Ringabschnitt
US7151059B2 (en) 1999-06-24 2006-12-19 Agere Systems Inc. MOS transistor and method of manufacture
EP3301285A1 (fr) * 2016-09-30 2018-04-04 Samyoung Machinery Co., Ltd. Calotte de piston à haute pression
CN113374593A (zh) * 2021-06-30 2021-09-10 东风商用车有限公司 一种活塞连杆结构及内燃发动机
KR20220051806A (ko) * 2020-10-19 2022-04-26 가부시키가이샤 자판엔진코포레숀 액랭식 피스톤 및 크로스헤드식 내연기관

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1531024A (fr) * 1966-07-12 1968-06-28 Burmeister & Wains Mot Mask Perfectionnements relatifs aux pistons en particulier pour moteurs à combustion interne
DE1801496A1 (de) * 1968-09-20 1970-04-23 Sulzer Ag Fluessigkeitsgekuehlter Kolben einer Kolbenbrennkraftmaschine
FR2187021A5 (fr) * 1970-10-23 1974-01-11 Burmeister & Wains Mot Mask
FR2396172A1 (fr) * 1977-07-02 1979-01-26 Maschf Augsburg Nuernberg Ag Piston en plusieurs parties pour moteurs a combustion interne
US4502422A (en) * 1982-12-27 1985-03-05 General Motors Corporation High output oil cooled floating piston

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1531024A (fr) * 1966-07-12 1968-06-28 Burmeister & Wains Mot Mask Perfectionnements relatifs aux pistons en particulier pour moteurs à combustion interne
DE1801496A1 (de) * 1968-09-20 1970-04-23 Sulzer Ag Fluessigkeitsgekuehlter Kolben einer Kolbenbrennkraftmaschine
FR2187021A5 (fr) * 1970-10-23 1974-01-11 Burmeister & Wains Mot Mask
FR2396172A1 (fr) * 1977-07-02 1979-01-26 Maschf Augsburg Nuernberg Ag Piston en plusieurs parties pour moteurs a combustion interne
US4502422A (en) * 1982-12-27 1985-03-05 General Motors Corporation High output oil cooled floating piston

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7151059B2 (en) 1999-06-24 2006-12-19 Agere Systems Inc. MOS transistor and method of manufacture
WO2001088350A1 (fr) * 2000-05-17 2001-11-22 Baschieri & Pellagri S.P.A. Modele ameliore de moteur deux-temps a combustion interne a rendement accru et faible niveau d'emission de gaz polluants
DE10047258A1 (de) * 2000-09-23 2002-04-18 Ks Kolbenschmidt Gmbh Kolben mit sich am Basisteil abstützenden und angeschweißtem Ringabschnitt
DE10047258C2 (de) * 2000-09-23 2003-02-06 Ks Kolbenschmidt Gmbh Kolben mit sich am Basisteil abstützenden und angeschweißtem Ringabschnitt
EP3301285A1 (fr) * 2016-09-30 2018-04-04 Samyoung Machinery Co., Ltd. Calotte de piston à haute pression
US10393062B2 (en) 2016-09-30 2019-08-27 Samyoung Machinery Co., Ltd. High pressure piston crown
KR20220051806A (ko) * 2020-10-19 2022-04-26 가부시키가이샤 자판엔진코포레숀 액랭식 피스톤 및 크로스헤드식 내연기관
KR102599702B1 (ko) 2020-10-19 2023-11-07 가부시키가이샤 자판엔진코포레숀 액랭식 피스톤 및 크로스헤드식 내연기관
CN113374593A (zh) * 2021-06-30 2021-09-10 东风商用车有限公司 一种活塞连杆结构及内燃发动机

Also Published As

Publication number Publication date
DK90295A (da) 1997-02-12
DK172217B1 (da) 1998-01-05

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