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WO1995008066A1 - Crosse pour moteur en v a deux temps - Google Patents

Crosse pour moteur en v a deux temps Download PDF

Info

Publication number
WO1995008066A1
WO1995008066A1 PCT/DK1994/000336 DK9400336W WO9508066A1 WO 1995008066 A1 WO1995008066 A1 WO 1995008066A1 DK 9400336 W DK9400336 W DK 9400336W WO 9508066 A1 WO9508066 A1 WO 9508066A1
Authority
WO
WIPO (PCT)
Prior art keywords
crosshead
pin
section
pin section
shoe
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
PCT/DK1994/000336
Other languages
English (en)
Inventor
Finn Quordrup Jensen
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.)
MAN B&W Diesel GmbH
MAN B&W Diesel AS
Original Assignee
MAN B&W Diesel GmbH
MAN B&W Diesel 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 MAN B&W Diesel GmbH, MAN B&W Diesel AS filed Critical MAN B&W Diesel GmbH
Priority to JP50891595A priority Critical patent/JP3212610B2/ja
Priority to KR1019960700017A priority patent/KR100310085B1/ko
Publication of WO1995008066A1 publication Critical patent/WO1995008066A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0021—Construction
    • F02F7/0034—Built from sheet material and welded casings
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C5/00—Crossheads; Constructions of connecting-rod heads or piston-rod connections rigid with crossheads
    • 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
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
    • 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
    • F02F7/00—Casings, e.g. crankcases
    • F02F7/0002—Cylinder arrangements
    • F02F7/0007—Crankcases of engines with cylinders in line
    • 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
    • F16J7/00—Piston-rods
    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases
    • F02F2007/0097—Casings, e.g. crankcases for large diesel engines

Definitions

  • a crosshead for a two-stroke V-engine is A crosshead for a two-stroke V-engine.
  • the invention relates to a crosshead for a large two-stroke V-engine of the crosshead type having its cylinders arranged in two rows and having a transverse stiffening carrying guide planes for crossheads in pairs of associated neighbouring cylinders, each cylinder being positioned in a respective row, wherein the two connecting rods associated with a cylinder pair are joumalled side by side on a joint connecting rod pin, and wherein the journal surface of a crosshead pin is asymmetrically positioned in the longitudinal direction of the pin so that a first pin section connecting the journal surface with one crosshead shoe is longer than a second pin section connecting the journal surface with the other crosshead shoe-
  • Such a crosshead is known from the Applicant's Danish patent application No. 1479/92.
  • the crosshead is a vital, heavily loaded engine component which has to be very reliable in operation.
  • the crosshead In large crosshead engines with outputs of up to 5000 k per cylinder, the crosshead has to transmit large compressive forces from the piston rod to the connecting rod, and as the oscillating swinging movement of the connecting rod in relation to the piston rod takes pace at a low speed and at a limited amplitude, it is difficult to maintain a lubricating oil film of suitable thickness between the journal surface of the crosshead bearing and the sliding surface in the surrounding crosshead housing.
  • the object of the invention is to obtain the largest possible degree of operational reliability for the crosshead bearing with the asymmetrical pin.
  • the crosshead according to the invention is characterized in that the mass of the first pin section with the associated crosshead shoe is reduced and/or the mass of the second pin section with associated crosshead shoe is increased so that the centre of gravity for the crosshead pin with the cross ⁇ head shoes is located substantially at the middle of the crosshead bearing.
  • the mass of the first pin section is reduced by means of a centrally extending bore which, in addition to being simple to manufacture, also involves the advantage that the material in the pin section is located at a distance from the longitudinal axis of the pin so that the pin retains most of its rigidity.
  • the first pin section has a smaller diameter than the second pin section, which may be realized either by reducing the diameter of the first section or by increasing the diameter of the second section, and the latter is preferred in the cases where the pin has to have a high degree of rigidity.
  • the crosshead shoe on the first pin section has a smaller mass than the crosshead shoe on the second pin section.
  • Fig. 1 shows a longitudinal sectional view through a cylinder unit having a crosshead according to the invention
  • Fig. 2 is a sectional view along the line II-II in Fig. 1 through the crossheads in two associated neigh ⁇ bouring cylinders
  • Figs. 3 and 4 are longitudinal sectional views through the crosshead pins of a second and a third embodiment, respectively, according to the invention.
  • Fig. 1 shows a crank throw 1 of a crankshaft in a large low-speed V-engine of the crosshead type, which may, for example, be a propulsion engine of a ship or a power-producing stationary engine.
  • the crank throw has a connecting rod pin 2, on which two uniform connecting rods 3 are joumalled side by side.
  • the connecting rods lead up to respective sets of crosshead 4, piston rod 5 and piston 6 in two associated neighbouring cylinders positioned between two transverse walls 7 and 8 forming a transverse stiffening in the engine frame box located between the bedplate and the cylinder section.
  • the transverse walls 7, 8 are plane and through- going in the transverse direction of the frame box so as to impart great rigidity to it.
  • the transverse walls may be single-layer stiffened plate walls or may be frame sections constructed from profiles and plate portions.
  • Guide planes 9 for the crossheads are fastened to the transverse walls, for example by means of welding and a suitable number of stiffeners 10 on the backs of the guide planes.
  • the guide planes extend substantially over the full height of the engine frame box and are oblique in relation to the longitudinal median plane of the frame box so that they extend in parallel with the longitudinal axis of the associated cylinder liner 11.
  • the longitudinal axes of the two cylinder liners in a pair of neighbouring cylinders form an angle with the apex positioned at a level with or below the longitudi- nal axis of the crankshaft.
  • the crosshead 4 comprises a two-piece bearing housing, the underpart 12 of which merges with the connecting rod, and the upper part 13 of which has an upwardly open cut, through which the piston rod passes for fastening on a crosshead pin 14, which is joumalled in the bearing housing with a joumal section 15.
  • the crosshead pin carries two crosshead shoes 16, 17, which slide along the guide planes and guide the crosshead in the transverse direction of the engine.
  • the crosshead pin 14 has a first pin section 18 which extends from one end of the journal section to one end of the pin, where one shoe 16 is joumalled on the pin, and a second pin section 19 which extends from the other end of the journal section to the other end of the pin, where the second shoe 17 is joumalled on the pin.
  • first section 18 is longer than the second section 19, so that the journal surface or section has an asymmetrical location in the longitudinal direction of the pin.
  • the first pin section 18 has a centrally extending bore 20, which opens out in the pin end, and the diameter and length of which are adapted so that the centre of gravity 21 of the pin is located at the middle of the joumal surface.
  • the same reference numerals will be used as above for details of the same type.
  • the first pin section 18 has been turned down to a smaller diameter, where the depth and position of the mass-reducing turning have been adapted so that the mass centre of gravity 21 of the pin is located at the middle of the journal surface. It is, of course, also possible to manufacture part of the second pin section 19 with a larger diameter.
  • the first and the second pin sections are designed with identical diameters, but the crosshead shoe 16 on the first section 18 has a smaller mass than the shoe 17 on the second section 19, so that the centre of gravity 21' of the pin with associated crosshead shoes is located at the middle of the joumal surface.
  • the increased mass of the second shoe 17 may be provided by increasing the diameter of the shoe, as shown, but this has the result that the associated guide planes have to be spaced further apart.
  • the mass increase of the second shoe may alternatively be provided by mounting one or more separate weights on the shoe, for example by fastening between the sliding surface carrying arms in positions above and/or below the central journalling section on the shoe.
  • the centre of gravity of the crosshead pin and the members carried thereby may be determined, and by the aid of quite ordinary mass moment calculations the dimensions and the location of the mass-increasing or mass-reducing means according to the invention may be determined so that the centre of gravity of the crosshead pin with associated members is made to be located at the middle of the crosshead bearing.
  • the above embodiments may be combined to obtain the desired location of the centre of gravity. If the crosshead pin is provided with oil distribution channels for lubrication of the guide planes, the diameter of the bore in the first pin section may be increased by as much as the oil distribution allows, and any remaining imbalance may be removed by a relatively limited increase of the mass of the second pin section and/or the second crosshead shoe.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

Une crosse destinée à un moteur en V à deux temps de dimensions importantes comprend un élément de renforcement transversal (7, 8) portant des plans de guidage (9) destinés à la crosse se trouvant dans des paires de cylindres adjacents. Pour chaque paire de cylindres, les bielles (3) sont tourillonnées côte à côte sur une cheville de bielle commune (2), de sorte que les crosses ne soient pas positionnées au centre par rapport aux éléments de renforcement transversaux. Le tourillon (14) de la crosse est asymétrique autour de la surface (15) qui est tourillonnée dans l'enveloppe de la crosse dans la mesure où ladite surface est reliée aux deux patins (16, 17) de crosse associés par l'intermédiaire d'une première partie (18) et d'une seconde partie (19) de tourillon de différentes longueurs. Les masses des deux parties de tourillons, avec leurs patins associés, sont déterminées de façon que le centre de gravité du tourillon, avec ses patins, soit situé au centre du palier (4) de la crosse.
PCT/DK1994/000336 1993-09-13 1994-09-09 Crosse pour moteur en v a deux temps Ceased WO1995008066A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP50891595A JP3212610B2 (ja) 1993-09-13 1994-09-09 ２ストロークｖ型エンジン用クロスヘッド
KR1019960700017A KR100310085B1 (ko) 1993-09-13 1994-09-09 2행정v-엔진용크로스헤드

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK199301021A DK172977B1 (da) 1993-09-13 1993-09-13 Krydshoved
DK1021/93 1993-09-13

Publications (1)

Publication Number Publication Date
WO1995008066A1 true WO1995008066A1 (fr) 1995-03-23

Family

ID=8100103

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000336 Ceased WO1995008066A1 (fr) 1993-09-13 1994-09-09 Crosse pour moteur en v a deux temps

Country Status (4)

Country Link
JP (1) JP3212610B2 (fr)
KR (1) KR100310085B1 (fr)
DK (1) DK172977B1 (fr)
WO (1) WO1995008066A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096721A1 (fr) * 2000-06-15 2001-12-20 Igor Olegovich Kiriljuk Moteur a combustion interne en opposition
EP1191240A1 (fr) * 2000-09-25 2002-03-27 Wärtsilä Schweiz AG Patin de glissement pour crosse de piston
RU2191906C2 (ru) * 2000-05-22 2002-10-27 Игорь Олегович Кирилюк Оппозитный двигатель внутреннего сгорания
EP1881255A2 (fr) * 2006-07-18 2008-01-23 Wärtsilä Schweiz AG Support de moyeu pour un arbre d'un moteur à combustion interne
ITMI20081723A1 (it) * 2008-09-29 2010-03-30 Nuovo Pignone Spa Manovellismo per un compressore alternativo

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003468A1 (de) * 1990-02-06 1991-08-08 Kloeckner Humboldt Deutz Ag Pleuel fuer hubkolben-brennkraftmaschinen mit asymmetrischem schaftquerschnitt
WO1994013966A1 (fr) * 1992-12-09 1994-06-23 Man B&W Diesel A/S Moteur a piston du type a crosse
WO1994013944A1 (fr) * 1992-12-09 1994-06-23 Man B&W Diesel A/S Moteur en v du type a crosse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4003468A1 (de) * 1990-02-06 1991-08-08 Kloeckner Humboldt Deutz Ag Pleuel fuer hubkolben-brennkraftmaschinen mit asymmetrischem schaftquerschnitt
WO1994013966A1 (fr) * 1992-12-09 1994-06-23 Man B&W Diesel A/S Moteur a piston du type a crosse
WO1994013944A1 (fr) * 1992-12-09 1994-06-23 Man B&W Diesel A/S Moteur en v du type a crosse

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2191906C2 (ru) * 2000-05-22 2002-10-27 Игорь Олегович Кирилюк Оппозитный двигатель внутреннего сгорания
WO2001096721A1 (fr) * 2000-06-15 2001-12-20 Igor Olegovich Kiriljuk Moteur a combustion interne en opposition
EP1191240A1 (fr) * 2000-09-25 2002-03-27 Wärtsilä Schweiz AG Patin de glissement pour crosse de piston
KR100797129B1 (ko) * 2000-09-25 2008-01-22 베르트질레 슈바이츠 악티엔게젤샤프트 크로스헤드 슬라이딩 슈
CN100374743C (zh) * 2000-09-25 2008-03-12 瓦特西拉瑞士有限公司 十字头滑块
EP1881255A2 (fr) * 2006-07-18 2008-01-23 Wärtsilä Schweiz AG Support de moyeu pour un arbre d'un moteur à combustion interne
ITMI20081723A1 (it) * 2008-09-29 2010-03-30 Nuovo Pignone Spa Manovellismo per un compressore alternativo
EP2169242A1 (fr) * 2008-09-29 2010-03-31 Nuovo Pignone S.P.A. Mécanisme articulé pour un compresseur alternatif
CN101713392A (zh) * 2008-09-29 2010-05-26 诺沃皮尼奥内有限公司 用于往复式压缩机的曲柄机构

Also Published As

Publication number Publication date
JP3212610B2 (ja) 2001-09-25
JPH09502500A (ja) 1997-03-11
KR960704169A (ko) 1996-08-31
DK172977B1 (da) 1999-11-01
DK102193D0 (da) 1993-09-13
DK102193A (da) 1995-03-14
KR100310085B1 (ko) 2001-12-15

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