EP2018916B1 - Procédé de fabrication d´un corps de cylindre d'un moteur - Google Patents

Procédé de fabrication d´un corps de cylindre d'un moteur Download PDF

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Publication number
EP2018916B1
EP2018916B1 EP08252467A EP08252467A EP2018916B1 EP 2018916 B1 EP2018916 B1 EP 2018916B1 EP 08252467 A EP08252467 A EP 08252467A EP 08252467 A EP08252467 A EP 08252467A EP 2018916 B1 EP2018916 B1 EP 2018916B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
cylinder sleeve
cylinder body
casting
sleeve
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.)
Active
Application number
EP08252467A
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German (de)
English (en)
Other versions
EP2018916A1 (fr
Inventor
Tatsuya Masuda
Noriki Tsukiji
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Publication of EP2018916A1 publication Critical patent/EP2018916A1/fr
Application granted granted Critical
Publication of EP2018916B1 publication Critical patent/EP2018916B1/fr
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/0009—Cylinders, 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
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/04—Cylinders; Cylinder heads  having cooling means for air cooling
    • F02F1/06—Shape or arrangement of cooling fins; Finned cylinders
    • F02F1/08—Shape or arrangement of cooling fins; Finned cylinders running-liner and cooling-part of cylinder being different parts or of different material

Definitions

  • the present invention relates to a cylinder body of an engine in which a cylinder sleeve is provided by means of cast coating and a method of manufacturing the same.
  • JP-A-59-74354 discloses a known cylinder body of an engine in which a cylinder sleeve of the cylinder body is formed so that a central portion thereof in an axial direction is made large in thickness as compared with both ends thereof.
  • This is intended for preventing a cylinder sleeve from being deformed by a large shrinkage force, which is generated with cooling of an aluminum alloy, in the casting process of a cylinder body.
  • one end of the cylinder sleeve is exposed to an end surface of the cylinder body to constitute a part of a surface of the cylinder body, which mates with a cylinder head.
  • the mating surface is subjected to cutting work after casting of the cylinder body, and the mating surface is finished to be made flat.
  • JP-A-10-220278 also discloses a known cylinder body of an engine.
  • the invention has been thought of in order to dissolve such a problem and has its object to provide a cylinder body of an engine capable of shortening the time required for machining of a surface of the cylinder body, which mates with a cylinder head, to achieve reduction in cost while adopting a construction in which manufacture is made possible by the die casting method.
  • US2003/085018 describes a casting die for the production of a cylinder block/crankcase of an engine, including at least one sleeve and is fitted with a cylinder liner.
  • the cylinder liner is held a distance from the wall of the die on the cylinder head side of the casting die by a spacer.
  • molten metal flows such that it overflows an upper edge of the cylinder liner.
  • a method of manufacturing a cylinder body of an engine comprising a die casting step, in which a cylinder sleeve is provided in a cylinder body by means of cast coating, and a cutting step, in which a surface mating with a cylinder head is formed on one end of the cylinder body so that an end surface of the cylinder sleeve is exposed, and is carried out by forming one end of the cylinder sleeve to make the same small in outside diameter as compared with the remaining portion of the cylinder sleeve, casting the cylinder body in a state, in which a columnar portion of a casting metal mold is fitted into the cylinder sleeve, and forming an end surface of the one end of the cylinder sleeve in the cutting step to make the same flat so as to constitute a part of the mating surface.
  • a cylinder body of an engine comprising a cylinder sleeve provided by means of cast coating, one end of the cylinder sleeve constituting a part of a surface mating with a cylinder head.
  • the cylinder body may be cast in a state, in which a columnar portion of a casting metal mold is fitted into the cylinder sleeve, by means of a die casting method.
  • One end of the cylinder sleeve may be formed to be small in outside diameter as compared with the remaining portion of the cylinder sleeve, and an end surface of the one end is formed by cutting work after casting and comprises a flat surface, which constitutes a part of the mating surface.
  • the one end of the cylinder sleeve may therefore be supported from inside by the columnar portion of the casting metal mold fitted into the cylinder sleeve when the cylinder body is die cast, so that although the one end is formed to be relatively thin, it is possible to perform die casting while preventing the one end from being deformed.
  • the cylinder body is molded by a casting metal mold, a gate of which is formed in a position opposed to one end of the cylinder sleeve.
  • the one end of the cylinder sleeve opposed to the gate may be formed to be small in thickness, so that the gates can be formed to be made appropriately wide without forming the mating surface of the cylinder body adjacent to the gate to make the same large and a molten metal can be made easy to flow into the cavity from the gate.
  • the cylinder body may be cast in a state, in which both axial ends of the cylinder sleeve are interposed by the casting metal mold.
  • a plurality of circumferentially extending ridges may be formed on an outer periphery of the cylinder sleeve to be spaced in an axial direction of the cylinder sleeve.
  • the ridges of the cylinder sleeve engage with a central portion of the cylinder body, which is cast so as to surround the cylinder sleeve, so that it is possible to prevent the cylinder sleeve from coming off from inside the cylinder body after the cylinder body is cast. Accordingly, it is possible to provide a cylinder body, on which a cylinder sleeve is provided firmly.
  • Described herein is a method of manufacturing a cylinder body of an engine, the method comprising the steps of:
  • the casting mold may comprise a gate which is formed in a position opposed to the first end of the cylinder sleeve.
  • the cylinder sleeve may have a second end axially opposite the first end, and during the step of casting the first and second ends of the cylinder sleeve may be interposed by the casting mold.
  • a plurality of circumferentially extending ridges may be formed on an outer periphery of the cylinder sleeve to be spaced in an axial direction of the cylinder sleeve.
  • a cylinder body of an engine may comprise a cylinder sleeve having a first end which defines an outer diameter which is smaller than the outer diameter of the remaining portion of the cylinder sleeve, wherein the cylinder sleeve is provided within the cylinder body by casting said body around said sleeve while a columnar portion of a casting mold is inserted into said sleeve.
  • a machined mating surface adapted to mate with a cylinder head may be formed on the cylinder body, wherein an end face of the first end of the cylinder sleeve is formed by machining to define a flat surface which constitutes a part of the mating surface.
  • a gate of the casting mold may be formed in a position opposed to the first end of the cylinder sleeve.
  • the cylinder sleeve may define a second end axially opposite the first end, and wherein the cylinder body may be cast in a state, in which the first and second ends of the cylinder sleeve are interposed by the casting mold.
  • a plurality of circumferentially extending ridges may be formed on an outer periphery of the cylinder sleeve to be spaced in an axial direction of the cylinder sleeve.
  • Fig. 1 is a cross sectional view showing a part of an engine using a cylinder body according to the invention
  • Fig. 2 is a cross sectional view showing a casting metal mold for casting of a cylinder body according to the invention
  • Fig. 3 is a perspective view showing a cylinder body after casting.
  • the reference numeral 1 denotes an engine, which uses a cylinder body 2 according to the embodiment.
  • the engine 1 is an air-cooled type four-stroke single-cylinder engine.
  • the engine 1 includes a crank case 4, which rotatably supports a crank shaft 3, the cylinder body 2 mounted to the crank case 4, and a cylinder head 5 mounted to a tip or top end of the cylinder body 2.
  • the engine 1 is mounted on a body frame (not shown) of a motorcycle in a state, in which an axis C of a cylinder is directed substantially to the front of a vehicle body.
  • the cylinder body 2 is molded into a predetermined shape by a die casting method, in which an aluminum alloy is used as a material and a casting metal mold 6 (see Fig. 2 ) described later is used.
  • a cylinder sleeve 11 into which a piston 7 is inserted and fitted, is provided on the cylinder body 2 by means of cast coating.
  • the cylinder body 2 is formed integrally with a multiplicity of radiating fins 12 as shown in Fig. 1 and with a chain chamber 13 as shown in Fig. 3 .
  • the chain chamber 13 is formed in a manner to extend through a side of the cylinder body 2 in an axial direction of the cylinder.
  • a mount seat 14 for mounting of the cylinder body 2 is provided at one end of the cylinder body 2 as shown in Figs. 1 and 3 .
  • the mount seat 14 is formed to project toward the cylinder head 5 with a step from the radiating fin 12 in a position closest to the cylinder head 5 and formed with a mating surface 15, which mates with the cylinder head 5.
  • An end of the cylinder sleeve 11 is exposed to the mating surface 15.
  • the cylinder sleeve 11 is formed from cast iron to be cylindrically shaped and positioned in the cylinder body 2 in a state, in which one end 11a thereof is exposed to the mating surface 15 of the cylinder body 2.
  • a plurality of circumferentially extending ridges 16 are formed on an outer periphery of the cylinder sleeve 11 to be spaced in an axial direction (axial direction of the cylinder) of the cylinder sleeve 11. These ridges 16 are formed so as not to be made discrete in a circumferential direction of the cylinder sleeve 11 and embedded in a central portion 2a of the cylinder body 2.
  • An outside diameter D1 (see Fig. 2 ) of the one end 11a of the cylinder sleeve 11 is formed to be small as compared with an outside diameter D2 of other portions (main, outer peripheral surfaces positioned between the ridges 16) of the cylinder sleeve 11. That is, end 11a is formed to be small in thickness as compared with other portions of the cylinder sleeve 11.
  • An end surface of the end 11a is made flat by machining after casting of the cylinder body 2 so as to constitute a continuous and flush mating surface 15 for mating with the cylinder head 5.
  • the machining is performed by using, for example, a milling cutter to cut the end surface of the cylinder sleeve 11 and an end surface of the cylinder body 2 simultaneously. By subjecting the both end surfaces to the machining, the mating surface 15 may be formed on the cylinder body 2.
  • An intake port 22 and an exhaust port 23 with respective ends being opened to the recess 21 are also formed on the cylinder head 5.
  • an intake valve 24, an exhaust valve 25, a rocker arm type valve operating device 26 for driving of the both valves 24, 25 or the like are also provided on the cylinder head 5.
  • a cam shaft 27 of the valve operating device 26 is connected to the crank shaft 3 by a timing chain (not shown). The timing chain is extended through the chain chamber 13 of the cylinder body 2 to connect between the cam shaft 27 and the crank shaft 3.
  • the cylinder body 2 is cast by a die casting method with the use of the casting metal mold 6.
  • the casting metal mold 6 comprises a stationary metal mold 31 formed in a manner to cover the cylinder body 2 from the cylinder head 5 side, a moving metal mold 32 capable of moving in a direction (vertical direction in Fig. 2 ) toward and away from the stationary metal mold 31, a bore pin 33 formed to be made columnar to fit into the cylinder sleeve 11 and mounted to the moving metal mold 32, and four slide metal molds 34 positioned between the stationary metal mold 31 and the moving metal mold 32 in a manner to surround a periphery of the bore pin 33.
  • the bore pin 33 constitutes a columnar portion of a casting metal mold referred to in the invention.
  • a tip end (upper end in Fig. 2 ) of the bore pin 33 is formed to be fusiform-shaped to become gradually thinner toward a tip end and faces an interior of a runner 35 of the stationary metal mold 31 in a state of closing shown in Fig. 2 .
  • An upstream end of the runner 35 is connected to a sprue (not shown).
  • a step 33a against which an end surface of the cylinder sleeve 11 toward a crank chamber abuts, is formed at a base end of the bore pin 33.
  • the cylinder sleeve 11 is charged into a cavity 36 (see Fig. 2 ) of the metal mold 6 in a state of having the bore pin 33 fitted thereinto and being born by the step 33a of the bore pin 33.
  • a core (not shown) for molding of the chain chamber 13 is provided in a position adjacent to the cylinder sleeve 11 within the cavity 36.
  • Projections 37 which interpose the cylinder sleeve 11 between them and the step 33a, are provided in four locations on that end of the stationary metal mold 31, at which a downstream end of the runner 35 is formed.
  • the projections 37 are provided to be spaced at equal intervals in four locations in the circumferential direction of the cylinder sleeve 11.
  • the projections 37 abut against the end surface of the one end 11a of the cylinder sleeve 11 to push the same toward the other end in a state of closing shown in Fig. 2 .
  • the downstream end of the runner 35 is connected to gates 38 formed in positions opposed to the one end 11a of the cylinder sleeve 11.
  • the gates 38 are formed between the stationary metal mold 31 and the bore pin 33 and between two adjacent projections 37. That is, as shown in Fig. 3 , the gates 38 are formed so as to cause a molten metal in the runner 35 to be led into the cavity 36 from four locations around the cylinder sleeve 11.
  • Fig. 3 shows a molding 41 formed by a molten metal, which solidifies in a whole region, which ranges from the runner 35 to the cavity 36, in a state of being not cut midway and being taken out of the casting metal mold 6. Since the runner 35 and the cavity 36 formed in the casting metal mold 6 corresponds in shape to the molding 41, the reference numerals 35, 38, 36 for the runner, the gates, and the cavity are denoted for the molding 41 in Fig. 3 .
  • the four slide metal molds 34 serve to mold a peripheral wall of the cylinder body 2 and are formed with recesses 42, which serve to mold the radiating fins 12 as shown in Fig. 2 .
  • the slide metal molds 34 are supported on the moving metal mold 32 so as to be able to move in the radial direction of the cylinder sleeve 11.
  • the cylinder sleeve 11 is fitted into the bore pin 33 and born by the step 33a of the bore pin 33. Then, the casting metal mold 6 is closed as shown in Fig. 2 . Owing to the closing, the cylinder sleeve 11 is interposed between the step 33a and the projections 37 of the stationary metal mold 31.
  • an in-runner molding 41a which the molten metal solidified in the runner 35 forms
  • an in-gate molding 41b which the molten metal solidified in the gates 38 form, are molded integrally with a product portion 41c to form the molding 41.
  • End 11a of the cylinder sleeve 11 is exposed to the cut end surface, said end 11a of the cylinder sleeve 11 is cut simultaneously when the cut end surface is worked.
  • End 11a of the cylinder sleeve 11 according to the embodiment is formed to be smaller in outside diameter than the remaining portions and formed to be small in thickness. Therefore, the cutting work of the cut end surface can be performed in a relatively short time although the cylinder sleeve 11 is formed from cast iron, which is relatively high in hardness.
  • the mating surface 15 comprising a flat surface is formed on the mount seat 14 whereby the manufacturing process of the cylinder body 2 terminates.
  • end 11a of the cylinder sleeve 11 is supported from inside by the bore pin 33 fitted into the cylinder sleeve 11 at the time of die casting, so that although the end 11a is formed relatively thin, it is possible to perform die casting while preventing the one end from being deformed.
  • time required for machining of the mating surface 15 can be shortened by forming the one end 11a of the cylinder sleeve 11, which is exposed to the mating surface 15 between the cylinder body 2 and the cylinder head 5, to make the same thin.
  • the gates 38 can be formed to be made appropriately wide without forming the mount seat 14 large and molten metal can more readily to flow into the cavity 36 from the gates 38.
  • the embodiment it is possible to perform die casting in a state, in which the cylinder sleeve 11 is supported by the stationary metal mold 31 and the bore pin 33 so as not to move. Therefore, the cylinder sleeve 11 is not changed in position every casting and an amount required for working the cylinder sleeve 11 is made constant every casting, so that it is possible to make the time required for working of the mating surface 15 shortest always.
  • the ridges 16 of the cylinder sleeve 11 engage with the central portion 2a of the cylinder body 2, which is cast so as to surround the cylinder sleeve 11, so that it is possible to prevent the cylinder sleeve 11 from detaching from inside the cylinder body 2 after the cylinder body 2 is cast.
  • a region, in which the cylinder sleeve 11 and the central portion 2a of the cylinder body 2 contact with each other, is increased in area making it easy for heat of the cylinder sleeve 11 to be transferred to the central portion 2a. Therefore, it is possible to improve the engine 1 in coolability.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Claims (4)

  1. Procédé de fabrication d'un corps de cylindre (2) d'un moteur (1), le procédé comprenant les étapes ci-dessous:
    fourniture d'une chemise de cylindre (11), comportant une première extrémité (11a) formée de sorte à avoir un diamètre extérieur inférieur à celui de la partie restante de la chemise du cylindre (11) ;
    insertion d'une partie en forme de colonne (33) d'un moule de coulée dans la chemise du cylindre (11) ;
    coulée d'un corps de cylindre (2) autour de la chemise du cylindre (11) par un procédé de coulée sous pression utilisant le moule de coulée (6), le moule de coulée (6) comprenant un moule métallique stationnaire (31), formé de sorte à couvrir le corps du cylindre (2) à partir d'un côté de la culasse du cylindre (5), un moule métallique mobile (32), pouvant se déplacer dans une direction allant vers le moule métallique stationnaire (31) et à l'écart de celui-ci, et au moins un moule métallique coulissant (34), positionné entre le moule métallique stationnaire (31) et le moule métallique mobile (32) ; et
    le moule de coulée comprenant une entrée (38), formée dans une position opposée à la première extrémité (11a) de la chemise du cylindre (11) ; et
    usinage d'une surface d'accouplement (15) du corps du cylindre coulé (2), destinée à être accouplée à une culasse du cylindre (5), une face d'extrémité de la première extrémité de la chemise du cylindre (11) étant formée lors de l'étape d'usinage afin de l'aplatir, de sorte à constituer une partie de la surface d'accouplement (15).
  2. Procédé selon la revendication 1, dans lequel la chemise du cylindre (11) comporte une deuxième extrémité opposée axialement à la première extrémité (11a), le moule de coulée étant agencé lors de l'étape de coulée entre les première et deuxième extrémités de la chemise du cylindre (11).
  3. Procédé selon les revendications 1 ou 2, dans lequel plusieurs nervures à extension circonférentielle (16) sont formées sur une périphérie externe de la chemise du cylindre (11), et sont espacées dans une direction axiale de la chemise du cylindre (11).
  4. Procédé de fabrication d'un corps de cylindre (2) d'un moteur (1) selon l'une quelconque des revendications 1 à 3, dans lequel
    l'étape de coulée du corps du cylindre (2) comprend étape de coulée sous pression, lors de laquelle la chemise du cylindre (11) est agencée dans le corps du cylindre (2) ; et
    l'étape d'usinage d'une surface d'accouplement (15) comprend une étape de coupe, lors de laquelle la surface (15) accouplée à la culasse du cylindre (5) est formée sur une extrémité du corps du cylindre, de sorte qu'une surface d'extrémité de la chemise du cylindre (11) est exposée.
EP08252467A 2007-07-20 2008-07-18 Procédé de fabrication d´un corps de cylindre d'un moteur Active EP2018916B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007189222A JP2009024616A (ja) 2007-07-20 2007-07-20 エンジンのシリンダボディおよびその製造方法

Publications (2)

Publication Number Publication Date
EP2018916A1 EP2018916A1 (fr) 2009-01-28
EP2018916B1 true EP2018916B1 (fr) 2010-12-22

Family

ID=39942400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08252467A Active EP2018916B1 (fr) 2007-07-20 2008-07-18 Procédé de fabrication d´un corps de cylindre d'un moteur

Country Status (8)

Country Link
EP (1) EP2018916B1 (fr)
JP (1) JP2009024616A (fr)
CN (1) CN101349212B (fr)
AT (1) ATE492362T1 (fr)
BR (1) BRPI0803659B8 (fr)
DE (1) DE602008004020D1 (fr)
ES (1) ES2356405T3 (fr)
TW (1) TWI339240B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI447299B (zh) * 2012-06-08 2014-08-01 Colis Ind Co Ltd 水冷式機車汽缸製法
CN102861897B (zh) * 2012-09-17 2014-11-19 江苏徐航科技有限公司 一种用于发动机气缸壳体缸套部位压铸成型的装置
CN109113969A (zh) * 2017-06-23 2019-01-01 上海海立电器有限公司 一种压缩机及压缩机的上缸盖制造方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760193C (de) * 1940-02-06 1953-06-15 Bayerische Motoren Werke Ag Verfahren zur Herstellung von aus Stahl und Leichtmetall zusammengesetzten Koerpern
JPS5974354A (ja) 1982-10-19 1984-04-26 Yamaha Motor Co Ltd エンジンにおける鋳込シリンダ
JPS60148657A (ja) * 1984-01-11 1985-08-05 Fuji Heavy Ind Ltd ２サイクルエンジン用シリンダの製造方法
JPH01317679A (ja) * 1987-12-14 1989-12-22 Nippon Piston Ring Co Ltd 鋳包み用中空筒体及びその製造方法
JPH04153549A (ja) * 1990-10-15 1992-05-27 Mazda Motor Corp シリンダブロック及びその製造方法
US5320158A (en) * 1993-01-15 1994-06-14 Ford Motor Company Method for manufacturing engine block having recessed cylinder bore liners
DE10153721C5 (de) 2001-10-31 2011-04-28 Daimler Ag Gießwerkzeug zur Herstellung eines Zylinderkurbelgehäuses
JP4429025B2 (ja) * 2004-01-09 2010-03-10 トヨタ自動車株式会社 鋳包み用シリンダライナ

Also Published As

Publication number Publication date
BRPI0803659B1 (pt) 2019-06-18
DE602008004020D1 (de) 2011-02-03
ATE492362T1 (de) 2011-01-15
TWI339240B (en) 2011-03-21
EP2018916A1 (fr) 2009-01-28
JP2009024616A (ja) 2009-02-05
CN101349212A (zh) 2009-01-21
BRPI0803659B8 (pt) 2021-05-25
CN101349212B (zh) 2011-05-18
ES2356405T3 (es) 2011-04-07
BRPI0803659A2 (pt) 2010-06-15
TW200918740A (en) 2009-05-01

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