EP2581581B1 - Dispositif de fixation pour moteur à deux temps - Google Patents

Dispositif de fixation pour moteur à deux temps Download PDF

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Publication number
EP2581581B1
EP2581581B1 EP11189650.2A EP11189650A EP2581581B1 EP 2581581 B1 EP2581581 B1 EP 2581581B1 EP 11189650 A EP11189650 A EP 11189650A EP 2581581 B1 EP2581581 B1 EP 2581581B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
pin
wall
bore
stroke engine
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.)
Not-in-force
Application number
EP11189650.2A
Other languages
German (de)
English (en)
Other versions
EP2581581A2 (fr
EP2581581A3 (fr
Inventor
Alexander Burgard
Michael Burgard
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.)
MAXISCOOT GmbH
Original Assignee
MAXISCOOT GmbH
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 MAXISCOOT GmbH filed Critical MAXISCOOT GmbH
Publication of EP2581581A2 publication Critical patent/EP2581581A2/fr
Publication of EP2581581A3 publication Critical patent/EP2581581A3/fr
Application granted granted Critical
Publication of EP2581581B1 publication Critical patent/EP2581581B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/18—Other cylinders
    • F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
    • 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
    • F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
    • F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
    • 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

Definitions

  • the invention relates to a two-stroke engine having a cylinder and a cylinder head, wherein the cylinder head closes the cylinder at a combustion chamber end, wherein the cylinder has an outlet passage, wherein in the cylinder at least one overflow channel is formed, and wherein the cylinder with fastening means on the engine block or attached to the crankcase of the two-stroke engine.
  • Two-stroke engines have one or more exhaust ports and a number of transfer ports disposed about the cylinder bore of the cylinder.
  • the transfer ports connect the combustion chamber in the cylinder to the crankcase to which the cylinder is attached.
  • JP 07 158 455 A is a two-stroke engine in which a cylinder is fastened with fastening bolts to the crankcase.
  • the fastening bolts are arranged in boreholes of the cylinder, which run parallel to the longitudinal axis of the cylinder.
  • the overflow channels are brought up to the wall of the boreholes.
  • the JP 61 167 119 A deals with a two-stroke engine.
  • an exhaust passage is provided which comprises two lateral extending arms.
  • a valve is arranged in the arms of the outlet channel, with which the arms of the outlet channel can be opened or closed.
  • the valves are arranged outside the cylinder bore and substantially parallel to the cylinder bore.
  • the two-stroke engine has an exhaust passage having two arms.
  • the arms of the outlet channel can be opened or closed with a valve, wherein the valves are arranged in a substantially cylindrical recess, which are arranged outside the cylinder bore and transversely to the cylinder bore.
  • the invention is therefore based on the object to provide solutions which make it possible to attach a cylinder to the engine housing or to the crankcase of different engine types, without the disadvantages of the prior art, in particular as regards the design of the outlet channels and / or the Overflow channels concerns having to accept.
  • bores extending advantageously parallel to the longitudinal axis of the cylinder can be produced, regardless of whether the bores penetrate the channels (outlet channel and / or overflow channels) or not.
  • the pin may be substantially cylindrical in shape and have an edge-side recess, the boundary surface of the edge-side recess substantially corresponding to the original surface of the wall of the outlet channel and / or the overflow channel in the region of the wall-side opening.
  • the pin may be configured in two parts, wherein a lower boundary surface of the upper part of the pin, a first wall-side Closing opening of the outlet channel and / or the overflow channel, and wherein an upper boundary surface of the lower part of the pin closes a second wall-side opening of the outlet channel and / or the overflow channel.
  • the pin or the upper part of the pin may be attached to the cylinder head, preferably with upper attachment means.
  • the upper end of the pin or the upper end of the upper part of the pin may have a blind bore for receiving the upper fastening means.
  • the pin has at least one radial recess for receiving an O-ring, preferably a sealing ring.
  • An upper portion of the pin may project at least partially into a recess corresponding to the upper portion of the pin on the underside of the cylinder head.
  • the upper portion of the pin has an anti-rotation, which projects into a recess corresponding to the rotation in the recess.
  • the anti-rotation device may comprise a needle bearing needle.
  • Fig. 1 shows a cylinder 20 according to the invention for a two-stroke engine with a cylinder head 10 in an exploded view.
  • the cylinder 20 has a bore in which a piston is guided up and down movable.
  • the cylinder 20 is closed at one end by a cylinder head 10.
  • the other end is attached to a crankcase, not shown here, with lower mounting screws 30 are provided for securing the cylinder in the existing stud holes of the crankcase.
  • a rotatably driven by the reciprocating piston and driven crankshaft is mounted in the crankcase.
  • the cylinder head 10 and the piston limited combustion chamber 27 is formed, which is connected via overflow 17 with the crankcase.
  • the combustion chamber 27 also has an outlet 15 and an outlet channel 16, respectively, for discharging the resulting combustion gases.
  • the openings in the cylinder wall of the overflow channels 17 or the outlet channels 16 are opened and closed by the reciprocating piston as a function of its stroke position. On the design of the overflow will be discussed in more detail later.
  • pins 40 Arranged on the cylinder head 10 are pins 40, which are fastened to the cylinder head 10 with upper fastening screws 60.
  • pins 40 are provided on the cylinder head 10.
  • more than four or less than four pins 40 may be provided.
  • the pins 40 may also be fastened to the cylinder head 10 with other fastening means.
  • the cylinder 20 has parallel to the longitudinal axis of the cylinder extending bores 50 which are provided for receiving the pins 40 when the cylinder head 10 is applied to the cylinder 20.
  • lower mounting screws are inserted in the bores 50, which at least partially protrude from the underside of the cylinder 20, and which are provided for attaching the cylinder 20 to the crankcase of the two-stroke engine ,
  • the pins 40 which in the embodiment according to Fig. 1 are configured in one piece, have edge-side recesses 41 which are configured such that they close the wall-side openings in the transfer channels 17 and outlet channels 16, as will be explained in more detail with reference to the following figures.
  • the cylinder head 10 has an opening 70 for receiving a spark plug, not shown here.
  • the holes 50 are preferably cylindrical in shape; the pins 40 are preferably also cylindrical in shape and have the same diameter as the holes 50th
  • Fig. 2 shows the cylinder 20 and the cylinder head 10 from Fig. 1 in an exploded view and in a section through the two front holes 50th
  • the pins 40 are fastened to the cylinder head 10 by means of upper fastening screws 60 on the cylinder head 10.
  • the pins 40 each have an anti-rotation 43, as with respect to Fig. 6 will be described in more detail.
  • the cylinder head 10 has recesses on the underside in which an upper portion of the pins 40 is arranged.
  • the recesses have a corresponding with the rotation 43 groove. The rotation and the respective groove ensure that the pins 40 each only can be fixed in a predetermined position on the cylinder head 10.
  • the arrangement of the bores 50 is selected such that the longitudinal axis of the bores 50 corresponds in each case to the longitudinal axis of a stud hole.
  • the bores 50 run at least partially through the overflow channels 17 and / or through the outlet channels 16.
  • the overflow channels 17 and / or the outlet channels 16 are at least partially bored, so that in the overflow channels 17 and / or in the outlet channels 16, a wall-side opening 55 is formed.
  • these wall-side openings 55 are closed again, and after closing the wall-side openings 55, the original shape of the channels is restored.
  • Fig. 2 shows two transfer ports 17, wherein the left overflow channel is partially drilled by a bore 50. Further shows Fig. 2 an outlet channel 16, which is also at least partially drilled by a bore 50.
  • Fig. 3 shows a cylinder according to the invention in a sectional view, wherein the section is parallel to the longitudinal axis of the cylinder 20 and through the outlet channels 16.
  • the left-hand outlet channel and the right-hand outlet channel 16 are each at least partially drilled by a bore 50, so that the left-hand and right-hand outlet channels 16 each have a wall-side opening 55.
  • These wall-side openings are through the pins 40 secured to the cylinder head 10 are closed, as in FIG Fig. 4 shown.
  • Fig. 4 shows the section through the cylinder 20 from Fig. 3 , wherein additionally an attached to the cylinder 20 cylinder head 10 is shown with the pins 40 disposed thereon.
  • the pins 40 are attached to the cylinder head 10 via upper mounting screws.
  • the pins 40 are designed so that they can be positively inserted into the holes 50.
  • Fig. 5 shows a side view of a cylinder 20 according to the invention with a cylinder head 10 arranged thereon, as well as two sectional views through the cylinder 20, wherein the sections each extend perpendicular to the cylinder axis of the cylinder 20.
  • the openings 55 at least partially penetrate the overflow channels 17 and at least partially the left and right outlet channels 16.
  • the resulting wall-side openings of the channels are each closed by a pin 40.
  • Fig. 6 shows a detailed view of a pin 40 according to the invention.
  • the pin 40 is designed substantially cylindrical and has an edge-side recess 41.
  • the boundary surfaces 41a which delimit the recess 41, substantially correspond to the original surface of the wall of the outlet channel or the overflow channel in the region of the wall-side opening.
  • the pin 40 can be arranged in the bore 50 essentially in a form-fitting manner.
  • the pin 40 may have in the upper region or in the region of the upper end a circumferential groove 42, in which, for example, a sealing ring can be arranged.
  • the pin 40 at the upper end to a rotation 43, which may be configured for example as a needle bearing needle.
  • the anti-rotation device 43 is provided to secure the pin 40 in a predetermined position on the cylinder head 10, wherein on the cylinder head 10 a corresponding with the rotation lock recess is provided, in which the rotation is arranged. This ensures that even when attaching the pins 40 to the cylinder head 10, the pins are secured in that position on the cylinder head, which is necessary for the closure of the wall-side openings in the channels.
  • edge-side recess 41 may have a different shape than those in Fig. 6 is shown.
  • the concrete shape of the peripheral recess 41 ultimately depends on how the respective channel runs, and how the bore 50 penetrates the respective channel.
  • a pin 40 may also have a plurality of recesses 41 when about two overflow channels are arranged one above the other or next to one another and the bore 50 drills both overflow channels.
  • cylinders according to the invention are shown, in which wall-side openings in the overflow channels 17 and outlet channels 16 are closed by means of one-piece pin 40.
  • Fig. 7 shows an embodiment of the invention, in which the pins 40 are designed in two parts.
  • a two-part design of the pins 40 is necessary when a bore 50 passes completely through a channel, ie when the bore 50 extends through the channel such that in the region of the channel the bore 50 lies completely within the channel.
  • the bore 50 forms two wall-side openings in the channel which are closed by a two-piece pin 40 with an upper portion 40a of the pin 40 closing the upper opening and a lower portion 40b of the pin 40 closing the lower opening ,
  • the upper portion 40a of the pin 40 has a lower boundary surface 41b which substantially corresponds to the original surface of the upper wall-side opening of the channel. Accordingly, the lower part 40b of the pin 40 has an upper boundary surface 41c, which substantially corresponds to the original surface of the lower wall-side opening of the channel.
  • Fig. 7 the bore 50 is completely separated by the outlet channels 16 of these, while the holes 50 are only partially severed in the region of the overflow 17 of these.
  • two-part pins 40 are provided in order to close the two wall-side openings in the outlet channels.
  • the lower part 40b of the pin 40 is first introduced into the bore 50 and fixed there.
  • the upper part 40 a of the pin 40 is fastened to the cylinder head 10 with upper fastening screws.
  • the lower parts 40b of the two-part configured pins 40 may have a rotation, which ensure that the lower parts 40b remain in the desired position in the bore 50.
  • the rotation can be configured so that a free movement of the lower part 40b of the two-part designed pin along the wellbore is prevented.
  • Fig. 8 shows a sectional view of a cylinder 20 according to the invention with a cylinder head 10, wherein the section parallel to the longitudinal axis of the cylinder and through the outlet channels 16 leads. It is particularly evident here that the left and the right outlet channel 16 completely penetrate the bore 50, so that preferably a two-part pin having a lower part 40b and an upper part 40a is provided in order to feed the two wall-side openings in the two outlet channels 16 close.
  • the cylinder according to the invention or with the fastening device according to the invention for attaching a cylinder to a crankcase of a two-stroke engine, it is possible to use a cylinder for different engine types, because to attach the cylinder to the respective crankcase no consideration has to be taken as the overflow or outlet channels run.
  • the overflow channels and / or the outlet channels can be drilled as desired, because the wall-side openings resulting from the bore in the respective channels are closed again with the inserted pins according to the invention.
  • Another advantage of the invention is that even in the design of the transfer channels and / or the outlet channels no consideration must be taken to the course possibly existing studs, because instead of the Stud bolts lower fixing screws 30 are provided, which are introduced into the original stud holes. As a result, there are more options for the design or the design of various channels available, so even more powerful cylinder can be produced, because the size and shape of the overflow and the outlet channels is not limited by the studs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Claims (9)

  1. Moteur à deux temps avec un cylindre (20) qui comprend une chambre de combustion (27) configurée dans une surface de glissement du cylindre (25), avec une tête de cylindre (10) qui ferme le cylindre (20) à une extrémité du côté de la chambre de combustion et avec un conduit d'évacuation (16) qui sort de la chambre de combustion (27), au moins un conduit de trop-plein (17) étant configuré dans le cylindre (20) pour relier l'espace intérieur d'un carter moteur du moteur à deux temps à la chambre de combustion (27),
    - le cylindre (20) présentant au moins une forure axiale (50) qui pénètre au moins partiellement à travers une paroi du conduit d'évacuation et/ou du conduit de trop-plein (17) si bien que la forure (50) dans le conduit d'évacuation et/ou le conduit de trop-plein (17) forme au moins une ouverture (55) du côté de la paroi et
    - une broche (40) pouvant être placée dans la forure qui existe au moins (50), la broche (40) étant adaptée pour fermer l'ouverture (55) qui existe au moins du côté de la paroi de telle manière que la surface d'origine de la paroi du conduit d'évacuation (16) et/ou du conduit de trop-plein (17) est substantiellement reconstituée dans la zone de l'ouverture (55) du côté de la paroi,
    caractérisé en ce
    qu'une section inférieure de l'au moins une forure (50) qui est tournée vers le carter moteur présente un plus petit diamètre que la section supérieure de l'au moins une forure (50), des moyens de fixation inférieurs (30) pouvant être placés dans la section inférieure de l'au moins une forure (50) pour fixer le cylindre (20) au carter moteur.
  2. Moteur à deux temps selon la revendication 1, la broche (40) étant formée substantiellement cylindrique et présentant un évidement en bordure (41), la surface de délimitation (41a) de l'évidement en bordure (41) correspondant substantiellement à la surface initiale de la paroi du conduit d'évacuation (16) et/ou du conduit de trop-plein (17) dans la zone de l'ouverture (55) du côté de la paroi.
  3. Moteur à deux temps selon l'une des revendications précédentes, la broche (40) étant configurée en deux parties, une surface de délimitation inférieure (41b) de la partie supérieure (40a) de la broche (40) fermant une première ouverture du côté de la paroi du conduit d'évacuation (16) et/ou du conduit de trop-plein (17) et une surface de délimitation supérieure (41c) de la partie inférieure (40b) de la broche (40) fermant une seconde ouverture du côté de la paroi du conduit d'évacuation (16) et/ou du conduit de trop-plein (17).
  4. Moteur à deux temps selon l'une des revendications précédentes, la broche (40) ou la partie supérieure (40a) de la broche (40) étant fixée à la tête de cylindre (10), de préférence avec des moyens de fixation supérieurs (60),
  5. Moteur à deux temps selon la revendication 4, l'extrémité supérieure de la broche (40) ou l'extrémité supérieure de la partie supérieure (40a) de la broche (40) présentant un trou borgne pour recevoir les moyens de fixation supérieurs (60).
  6. Moteur à deux temps selon l'une des revendications précédentes, la broche (40) présentant au moins un évidement radial (42) pour recevoir un joint torique, de préférence une bague d'étanchéité.
  7. Moteur à deux temps selon l'une des revendications précédentes, une section supérieure de la broche (40) faisant saillie au moins partiellement dans une cavité (45) qui correspond à la section supérieure de la broche (40) sur la face inférieure de la tête de cylindre (10).
  8. Moteur à deux temps selon la revendication 7, la section supérieure de la broche (40) présentant une sécurité anti-rotation (43) qui fait saillie dans la cavité (45) dans un évidement qui correspond à la sécurité anti-rotation (43).
  9. Moteur à deux temps selon la revendication 8, la sécurité anti-rotation (43) comprenant une aiguille de roulement à aiguilles.
EP11189650.2A 2011-10-12 2011-11-18 Dispositif de fixation pour moteur à deux temps Not-in-force EP2581581B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011054445A DE102011054445B3 (de) 2011-10-12 2011-10-12 Befestigungseinrichtung für Zweitaktmotor

Publications (3)

Publication Number Publication Date
EP2581581A2 EP2581581A2 (fr) 2013-04-17
EP2581581A3 EP2581581A3 (fr) 2013-06-19
EP2581581B1 true EP2581581B1 (fr) 2014-12-24

Family

ID=45350646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11189650.2A Not-in-force EP2581581B1 (fr) 2011-10-12 2011-11-18 Dispositif de fixation pour moteur à deux temps

Country Status (5)

Country Link
US (1) US9016248B2 (fr)
EP (1) EP2581581B1 (fr)
DE (1) DE102011054445B3 (fr)
DK (1) DK2581581T3 (fr)
ES (1) ES2533354T3 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1955586A1 (de) * 1969-11-05 1971-05-13 Zuendapp Werke Gmbh Fluessigkeitsgekuehlte ein- oder mehrzylindrige Zweitaktbrennkraftmaschine
JPS61167119A (ja) * 1985-01-17 1986-07-28 Kawasaki Heavy Ind Ltd 排気制御装置
JP2718482B2 (ja) * 1989-02-06 1998-02-25 ヤマハ発動機株式会社 ２サイクル多気筒エンジンの弁駆動機構
JPH07158455A (ja) * 1993-12-08 1995-06-20 Suzuki Motor Corp 二サイクルエンジンのシリンダー
JPH1122471A (ja) * 1997-07-07 1999-01-26 Toshikazu Kinoshita 間欠爆発２サイクルエンジン
DE19958828C1 (de) * 1999-12-07 2001-02-15 Stihl Maschf Andreas Verbindung Kurbelgehäuse/Zylindergehäuse
DE102009059144B4 (de) * 2009-12-19 2020-07-30 Andreas Stihl Ag & Co. Kg Zweitaktmotor

Also Published As

Publication number Publication date
EP2581581A2 (fr) 2013-04-17
EP2581581A3 (fr) 2013-06-19
ES2533354T3 (es) 2015-04-09
DE102011054445B3 (de) 2013-03-28
DK2581581T3 (en) 2015-04-07
US9016248B2 (en) 2015-04-28
US20130092137A1 (en) 2013-04-18

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