EP0287425A1 - Verfahren zur Herstellung eines Kipphebels eines Verbrennungsmotors und Aufbau der Giessform zur Durchführung des Herstellungsverfahrens - Google Patents

Verfahren zur Herstellung eines Kipphebels eines Verbrennungsmotors und Aufbau der Giessform zur Durchführung des Herstellungsverfahrens Download PDF

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Publication number
EP0287425A1
EP0287425A1 EP88400791A EP88400791A EP0287425A1 EP 0287425 A1 EP0287425 A1 EP 0287425A1 EP 88400791 A EP88400791 A EP 88400791A EP 88400791 A EP88400791 A EP 88400791A EP 0287425 A1 EP0287425 A1 EP 0287425A1
Authority
EP
European Patent Office
Prior art keywords
rocker arm
reinforcing element
molding
mold
spindle
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.)
Granted
Application number
EP88400791A
Other languages
English (en)
French (fr)
Other versions
EP0287425B1 (de
Inventor
Jean Dupin
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0287425A1 publication Critical patent/EP0287425A1/de
Application granted granted Critical
Publication of EP0287425B1 publication Critical patent/EP0287425B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F7/0087—Ceramic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/24—Accessories for locating and holding cores or inserts
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F01L2303/01—Tools for producing, mounting or adjusting, e.g. some part of the distribution

Definitions

  • the present invention relates to a method of molding a rocker arm for an internal combustion engine, a mold structure for the implementation of such a method and a rocker arm obtained according to the molding method.
  • the invention also relates to a method of machining the rocker arm obtained by the molding method as well as a rocker arm obtained according to the machining method.
  • Rockers of the type comprising a lever body comprising a first branch cooperating with a cam of an engine camshaft and a second branch cooperating with a valve stem, the lever body, of light alloy, being produced by a pressure shell molding process.
  • the branch cooperating with the cam has an extremely hard reinforcement element resistant to wear by friction with the cam and inserted during casting in the light alloy rocker arm.
  • the reinforcing element is made of sintered material, carbide or special cast iron.
  • the above materials constituting the reinforcing element have not always been entirely satisfactory, thus leading manufacturers to use ceramic reinforcing elements having better wear behavior than the metallic materials mentioned above, provided that the friction surface of the reinforcement element is close to "mirror polish".
  • the polish of the friction surface of the reinforcing element is obtained according to a known method before the positioning of the latter in the rocker arm, which means that the reinforcing element will not be machined after casting or molding the rocker arm. All machining of the rocker arm will therefore be carried out starting from the reinforcing element.
  • the ceramic reinforcing element is extremely hard and fragile and non-magnetic, it is necessary to hold it firmly in the mold without risk of breaking.
  • the pads obtained after "mirror-polished" machining cannot have absolutely identical dimensions, it is necessary to provide a device which makes it possible to compensate for the differences in dimensions of the pads.
  • the present invention solves the above problems by proposing a method of molding a rocker arm for an internal combustion engine, characterized in that it consists in firmly holding the ceramic reinforcing element, the friction surface of which with the cam is previously polished, in the mold at least during the molding operation of the rocker arm by a spindle member in forced support on the end of the reinforcing element opposite to the friction surface thereof.
  • a protruding part of the branch of the rocker arm cooperating with the cam opposite the reinforcement element and comprising a preferably flat surface, perpendicular to the axis longitudinal of the reinforcing element.
  • the mold structure by the implementation of the process defined above, of the type comprising two upper and lower half-molds, is characterized in that it comprises a device for holding the reinforcing element in one of the half-molds, comprising the aforementioned spindle part disposed on the end of the reinforcement element and a pusher assembly above the spindle part to maintain the latter in forced support on the reinforcement element.
  • the pusher assembly comprises an elongated pusher in the extension of the spindle part, an elastic prestressed return means bearing on the elongated pusher and a member for prestressing the elastic means integral with the half -mold.
  • the aforementioned elastic return means makes it possible to compensate for the differences in dimensions between two pads.
  • the invention also provides a method of machining the rocker arm obtained by the above molding method and characterized in that it consists in holding the branch of the rocker arm cooperating with a valve stem by appropriate means and in pressing in support. the element for reinforcing the rocker arm against a corresponding bearing surface by means of a member forming a clamping finger bearing on the flat surface of the projecting part of the rocker arm.
  • the molding structure 1 for the die casting of the light alloy constituting the rocker includes two upper and lower half-molds only the lower mold 2 being visible in the figure.
  • Reference 3 designates a ceramic reinforcing element which must be secured, after molding, to the branch of the lever body of the rocker arm cooperating with a cam of an internal combustion engine cam shaft.
  • This reinforcing element comprises a rubbing surface 3a intended to cooperate with the cam and previously polished according to a known method.
  • This rubbing surface has a convex or convex shape fitting into a corresponding cavity 2a of the lower half-mold 2.
  • the reinforcing element 3 further comprises a part forming an anchoring tail 3b of the element at the end of the branch of the rocker arm cooperating with the cam and situated opposite the friction surface 3a.
  • a device forming a pusher 4 exerts a thrust on a part forming a spindle 5 so as to maintain it in forced support on the part forming an anchor tail 3b of the reinforcing element 3.
  • the part forming a spindle 5 located in the longitudinal axis of the reinforcing element 3 is preferably of circular cross section, it being understood that any other shape of section (oval-rectangular-etc ...) is suitable.
  • the pusher device 4 comprises from bottom to top relative to FIG. 1 and along the longitudinal axis of the reinforcing element 3 an elongated pusher 4a, the lower end of which bears on the upper part of the part forming spindle 5 and carrying at its upper end a head 4a1, an elastic prestressed return means 4b bearing on the head 4a1 of the elongated plunger and a prestressing member 4c of the elastic means 4b, the member 4c being movable and slipping off at when the mold is opened.
  • the prestressing member 4c can be formed by a screw or any other mechanical means for adjusting the prestressing of the elastic means 4b which can be formed by a compression spring or by elastic steel washers of the Belleville type.
  • the prestressing member 4c, the elastic return means 4b and the head 4a1 of the pusher 4a are housed in a bore 4d of the lower half-mold 2 while the elongated part of the pusher 4a passes through a further bore 4e smaller diameter than that of bore 4d starting from the bottom of the latter and opening into the hollow of the mold, the lower end of the elongated part projecting into the hollow of the mold.
  • the pusher assembly 4 maintains forced support of the spindle portion 5 on the reinforcing element 3 which is thus firmly held in the cavity 2a of the lower half-mold 2.
  • FIG. 1 also shows the presence of a flat wall 1a produced in the hollow of the lower half-mold 2 perpendicular to the longitudinal axis of the reinforcing element 3, the bore 4e emerging through this wall.
  • the wall 1a is connected to the curved wall defining the upper end of the branch of the rocker arm cooperating with the cam by a flat wall 1b.
  • the part forming an anchor tail 3b of the reinforcing element 3 will be embedded with the pin-forming part 5 in the material of the rocker arm (see FIG. 2 ), which spindle part 5 will be of sufficient diameter to withstand the shocks resulting from the arrival of the material injected under pressure.
  • FIG. 3 represents the rocker arm 6 obtained after molding.
  • the rocker body comprises the branch 6a cooperating with the stem of a valve and the branch 6b cooperating with the cam of a camshaft and provided at its lower end with the ceramic reinforcing element 3.
  • the reference 6c denotes the projecting part from molding obtained from the walls 1a and 1b of the half-mold 2.
  • This projecting part mainly comprises a flat surface 6c1 situated opposite the reinforcing element 3 perpendicularly to the longitudinal axis thereof.
  • the spindle part was extracted during molding by conventional extractor devices not shown. There remains a hole delimited by the dotted lines and overhung by an orifice 6d opening onto the surface 6c1, which orifice was defined during molding by the lower end part of the elongated pusher 4a.
  • the presence of the flat surface 6c1 has the advantage of facilitating the holding in position of the rocker arm 6 during its machining.
  • This positioning is obtained by first placing the rubbing surface 3a of the reinforcing element 3 on a corresponding bearing surface A in the form of a V as shown in FIG. 3 or of concave shape and by maintaining the end of the branch 6a of the rocker arm between two opposite positioning keys 7. A part forming a clamping finger 8 and placed in abutment on the surface 6c1 and exerts pressure thereon by means of suitable means (not shown) for firmly pressing the 'reinforcing element 3 against the bearing surface A, thereby proceeding to the final machining of the rocker arm 6.
  • suitable means not shown
  • the surface 6v1 instead of being planar can for example be slightly curved, the plane tangent to the surface 6v1 at the point of intersection thereof with the longitudinal axis of the spindle being perpendicular said axis.
  • the pusher device 4 can also be constituted, for example, by a hydraulic or pneumatic piston device bearing on the spindle 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP88400791A 1987-04-14 1988-03-31 Verfahren zur Herstellung eines Kipphebels eines Verbrennungsmotors und Aufbau der Giessform zur Durchführung des Herstellungsverfahrens Expired - Lifetime EP0287425B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705300A FR2613963B1 (fr) 1987-04-14 1987-04-14 Procede de moulage et d'usinage d'un culbuteur pour moteur a combustion interne, structure de moule pour la mise en oeuvre du procede de moulage et culbuteur obtenu suivant les procedes de moulage et d'usinage
FR8705300 1987-04-14

Publications (2)

Publication Number Publication Date
EP0287425A1 true EP0287425A1 (de) 1988-10-19
EP0287425B1 EP0287425B1 (de) 1991-04-24

Family

ID=9350113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400791A Expired - Lifetime EP0287425B1 (de) 1987-04-14 1988-03-31 Verfahren zur Herstellung eines Kipphebels eines Verbrennungsmotors und Aufbau der Giessform zur Durchführung des Herstellungsverfahrens

Country Status (5)

Country Link
US (1) US4905751A (de)
EP (1) EP0287425B1 (de)
DE (1) DE3862506D1 (de)
ES (1) ES2022652B3 (de)
FR (1) FR2613963B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0775542A1 (de) * 1995-11-24 1997-05-28 Izumi Industries Ltd. Kolbenringpositionierungsvorrichtung und Kolbenstranggiessverfahren unter Verwendung dieser Vorrichtung
DE10011438C1 (de) * 2000-03-09 2001-07-12 Ks Kolbenschmidt Gmbh Gießform zur Herstellung eines Kolbens
WO2011138560A1 (fr) * 2010-05-06 2011-11-10 Snecma Dispositif de moulage d'une pièce par injection
CN110253295A (zh) * 2019-07-03 2019-09-20 焦佳敏 用于汽车摇臂的加工工装装置
CN112476252A (zh) * 2020-11-29 2021-03-12 和县华林精密铸造有限公司 一种精密铸件表面喷砂抛光装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5863003A (en) 1995-07-26 1999-01-26 Smith; Leward M. Waste processing machine
US6059210A (en) * 1999-01-20 2000-05-09 Smith; Leward N. Rotor assembly for a waste processing machine
DE102011082935A1 (de) * 2011-09-19 2013-03-21 Mahle International Gmbh Gießform eines Kolbens
JP2014205171A (ja) * 2013-04-15 2014-10-30 株式会社ニッセイ ダイカスト鋳造品の鋳造方法、及びダイカスト鋳造品

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1911040A (en) * 1932-01-27 1933-05-23 Firth Sterling Steel Co Molding appliance
DE853796C (de) * 1949-04-07 1952-10-27 Willy Dehnhard Verfahren zum Giessen eines Werkzeugmaschinenkopfes
FR1509304A (fr) * 1966-01-11 1968-01-12 Buehler Ag Geb Procédé pour l'exécution de pièces métalliques moulées sous pression et de pièces en matière synthétique moulées par injection
DE2146951A1 (de) * 1971-09-20 1973-03-22 Thurner Bayer Druckguss Schwinghebel und verfahren zu seiner herstellung
DE3520484A1 (de) * 1985-06-07 1986-12-11 Daimler-Benz Ag, 7000 Stuttgart Verfahren zum herstellen von leichtmetallen mit eingegossenem gleitstueck aus keramik nach dem druckgussverfahren und giessform zum herstellen solcher leichtmetallteile

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5614050A (en) * 1979-07-13 1981-02-10 Toyota Motor Corp Core fixing method
US4470786A (en) * 1981-07-28 1984-09-11 Omron Tateisi Electronics Co. Molding apparatus with retractable preform support pins
JPS5913563A (ja) * 1982-07-15 1984-01-24 Toyota Motor Corp ロツカア−ムの製造方法
JPS60102248A (ja) * 1983-11-07 1985-06-06 Toyota Motor Corp 金型構造
JPS60216965A (ja) * 1984-04-11 1985-10-30 Honda Motor Co Ltd 鋳ぐるみ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1911040A (en) * 1932-01-27 1933-05-23 Firth Sterling Steel Co Molding appliance
DE853796C (de) * 1949-04-07 1952-10-27 Willy Dehnhard Verfahren zum Giessen eines Werkzeugmaschinenkopfes
FR1509304A (fr) * 1966-01-11 1968-01-12 Buehler Ag Geb Procédé pour l'exécution de pièces métalliques moulées sous pression et de pièces en matière synthétique moulées par injection
DE2146951A1 (de) * 1971-09-20 1973-03-22 Thurner Bayer Druckguss Schwinghebel und verfahren zu seiner herstellung
DE3520484A1 (de) * 1985-06-07 1986-12-11 Daimler-Benz Ag, 7000 Stuttgart Verfahren zum herstellen von leichtmetallen mit eingegossenem gleitstueck aus keramik nach dem druckgussverfahren und giessform zum herstellen solcher leichtmetallteile

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 73 (M-463)[2130], 22 mars 1986; & JP-A-60 216 965 (HONDA GIKEN KOGYO K.K.) 30-10-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 61 (M-65)[733], 24 avril 1981; & JP-A-56 014 050 (TOYOTA JIDOSHA KOGYO K.K.) 10-02-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 252 (M-420)[1975], 9 octobre 1985; JP-A-60 102 248 (TOYOTA JIDOSHA K.K.) 06-06-1985 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0775542A1 (de) * 1995-11-24 1997-05-28 Izumi Industries Ltd. Kolbenringpositionierungsvorrichtung und Kolbenstranggiessverfahren unter Verwendung dieser Vorrichtung
DE10011438C1 (de) * 2000-03-09 2001-07-12 Ks Kolbenschmidt Gmbh Gießform zur Herstellung eines Kolbens
WO2011138560A1 (fr) * 2010-05-06 2011-11-10 Snecma Dispositif de moulage d'une pièce par injection
FR2959682A1 (fr) * 2010-05-06 2011-11-11 Snecma Dispositif de moulage d'une piece par injection
CN102883836A (zh) * 2010-05-06 2013-01-16 斯奈克玛 一种注射模制部件的装置
US8951038B2 (en) 2010-05-06 2015-02-10 Snecma Device for injection-moulding a part
CN102883836B (zh) * 2010-05-06 2015-07-08 斯奈克玛 一种注射模制部件的装置
CN110253295A (zh) * 2019-07-03 2019-09-20 焦佳敏 用于汽车摇臂的加工工装装置
CN112476252A (zh) * 2020-11-29 2021-03-12 和县华林精密铸造有限公司 一种精密铸件表面喷砂抛光装置

Also Published As

Publication number Publication date
EP0287425B1 (de) 1991-04-24
US4905751A (en) 1990-03-06
ES2022652B3 (es) 1991-12-01
FR2613963B1 (fr) 1991-02-08
DE3862506D1 (de) 1991-05-29
FR2613963A1 (fr) 1988-10-21

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