EP0704614A1 - Couvercle de culasse - Google Patents

Couvercle de culasse Download PDF

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Publication number
EP0704614A1
EP0704614A1 EP95114436A EP95114436A EP0704614A1 EP 0704614 A1 EP0704614 A1 EP 0704614A1 EP 95114436 A EP95114436 A EP 95114436A EP 95114436 A EP95114436 A EP 95114436A EP 0704614 A1 EP0704614 A1 EP 0704614A1
Authority
EP
European Patent Office
Prior art keywords
valve cover
valve
hood
cover
fastening elements
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
EP95114436A
Other languages
German (de)
English (en)
Other versions
EP0704614B1 (fr
Inventor
Roderich Dr. Kammerer
Frank Krause
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.)
Bayer AG
Original Assignee
Bayer AG
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 Bayer AG filed Critical Bayer AG
Publication of EP0704614A1 publication Critical patent/EP0704614A1/fr
Application granted granted Critical
Publication of EP0704614B1 publication Critical patent/EP0704614B1/fr
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
    • F02F7/006—Camshaft or pushrod housings
    • 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
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • 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
    • F05C2201/02—Light metals
    • F05C2201/021—Aluminium
    • 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
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
    • F05C2225/06—Polyamides, e.g. NYLON
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/16—Fibres
    • 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
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/18—Filler

Definitions

  • the invention relates to an acoustically decoupled valve cover for internal combustion engines based on plastic or metal as a cover material with an elastic plastic seal as a sealing material and connecting elements with disc springs, which acoustically decouple the valve cover from the motor housing.
  • Valve covers cover the camshafts of internal combustion engines.
  • the connection to the cylinder head is usually sealed with a seal on the underside of the hood. This seal is pretensioned by fastening screws on the cylinder head in order to apply the surface pressure required to seal the connection between the valve cover and the cylinder head.
  • the valve cover is traditionally made of aluminum. Sometimes, if the hood shape and the fastening concept allow it, plastic is also used, e.g. Polyamide.
  • plastic e.g. Polyamide.
  • the use of plastic as the hood material is advantageous over the use of metal, in particular aluminum, since this saves production costs, the hood has a lower weight and a better surface quality.
  • valve cover material has proven to be disadvantageous in the case of previously known valve cover designs for the following reasons:
  • the preload load case occurs long-term (i.e. over 103 - 104 hours) in connection with high temperature fluctuations (from -40 ° C - 140 ° C) or also with time-lapse testing within 103 h and a temperature of 130 - 150 ° C.
  • a high temperature and the longevity of the load prove to be unfavorable for thermoplastics and the creep of the material is accelerated.
  • Creep is understood here to mean a permanent change in shape resulting in a loss of pretension until leakage of the valve cover occurs.
  • the fastening screws would have to be tightened at regular intervals to compensate, but this is not possible for various reasons.
  • decoupling elements mentioned are comparatively expensive to manufacture. Since they also have a soft intermediate layer made of an elastomer, they increase the risk of a loss of pre-stress due to settling and creeping effects. This makes it clear that e.g. decoupled plastic hoods have not been used so far.
  • the object of the invention is to provide an acoustically decoupled valve cover, in particular made of plastic, preferably thermoplastic plastic, as the cover material, which does not have the disadvantages mentioned and in particular enables acoustic decoupling while at the same time maintaining the pretension for as long a period as possible.
  • an acoustically decoupled valve cover for internal combustion engines based on plastic, in particular thermoplastic, or metal, in particular aluminum, magnesium, steel or titanium, particularly preferably made of glass fiber reinforced polyamide-66, with an elastic plastic seal as the sealing material and one or a plurality of connecting elements, preferably screws, for connecting the valve cover to the engine housing, in which fastening elements with disk springs that pass on the pretensioning of the fastening elements to the valve cover are underlaid on the engine housing for fastening the valve cover, a horizontal characteristic curve in the force / spring travel curve have (corresponding to a spring rate of 0) and in which the plate springs are guided in a seat of the valve cover.
  • the fastening elements and the disk spring seat of the valve cover are provided with additional contact surfaces for the disk springs.
  • FIG. 2 The structure shown in FIG. 2 is described by way of example for a central screw connection.
  • the valve cover 1 is connected to the housing of the engine block 2 underneath by means of a fastening screw 4 which is underlaid with a plate spring 5.
  • the sealing of the valve cover 1 with the aid of the seal 3 can be effected using the usual temperature-resistant sealing materials.
  • silicone seals e.g. Siloprene LSR 2030, Bayer, have proven to be advantageous acoustic decoupling elements.
  • the fastening screw 4 can have a small shoulder 8 at the upper end of the screw shaft in order to prevent premature application of the plate spring on the underside of the screw head.
  • a support surface 7 can also be provided in the disc spring seat 6 of the valve cover. Any additional sealing membrane 9 to be used can prevent oil from escaping in the area of the fastening elements.
  • the inside diameter of the plate spring can also be designed according to the detail in FIG. 3.
  • valve covers for example flange screw connections
  • flange screw connections the cost advantage over known valve covers is increased due to the larger number of fastening elements required.
  • the central screw connection shown there is another effect that would otherwise be due to different coefficients of thermal expansion between the plastic (the valve cover) and the Cast iron or aluminum (of the motor housing) eliminates the inevitable temperature dependence of the preload.
EP95114436A 1994-09-27 1995-09-14 Couvercle de culasse Expired - Lifetime EP0704614B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4434453A DE4434453C2 (de) 1994-09-27 1994-09-27 Ventilhaube
DE4434453 1994-09-27

Publications (2)

Publication Number Publication Date
EP0704614A1 true EP0704614A1 (fr) 1996-04-03
EP0704614B1 EP0704614B1 (fr) 1998-03-25

Family

ID=6529284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95114436A Expired - Lifetime EP0704614B1 (fr) 1994-09-27 1995-09-14 Couvercle de culasse

Country Status (6)

Country Link
US (1) US5655489A (fr)
EP (1) EP0704614B1 (fr)
JP (1) JP3683014B2 (fr)
KR (1) KR100385249B1 (fr)
DE (2) DE4434453C2 (fr)
ES (1) ES2113703T3 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5884594A (en) * 1997-12-01 1999-03-23 Wiehle; David C. Valve cover system for motors
US6257188B1 (en) * 1998-09-02 2001-07-10 Honda Giken Kogyo Kabushiki Kaisha Structure for mounting cylinder head cover of internal combustion engine
US6085709A (en) * 1998-12-10 2000-07-11 Detroit Diesel Corporation Engine rocker arm cover having reduced noise transmission
DE19910467C1 (de) * 1999-03-10 2000-10-19 Schott Glas Halterung und Verfahren zur Herstellung einer Halterung für im wesentlichen flache Formkörper aus sprödbrüchigem Werkstoff
DE10119892C2 (de) * 2001-04-24 2003-04-03 Skf Ab Deckel, insbesondere zur Dämpfung des Geräusches eines Verbrennungsmotors
US20040121674A1 (en) * 2002-12-18 2004-06-24 Robbins Jeffrey R. Composite engine component and method for making the same
US20050132997A1 (en) * 2003-12-18 2005-06-23 Marcus Vargas Customization cover for engine valve covers
US20050220564A1 (en) * 2004-04-01 2005-10-06 Hinson Kerry D Fastener assembly with wave spring
US7051695B1 (en) * 2004-04-30 2006-05-30 Kowis Albert L Valve cover fastener and method
US7255079B2 (en) * 2004-10-18 2007-08-14 Federal-Mogul World Wide, Inc. Flanged cover assembly with flange pressure distribution compensator
US7343890B1 (en) * 2006-09-25 2008-03-18 Platt Richard B Two-piece valve cover
JP6134011B2 (ja) * 2013-02-25 2017-05-24 シロー インダストリーズ インコーポレイテッド 圧入締結孔を有するモジュール式アセンブリ
JP7028321B2 (ja) * 2018-07-05 2022-03-02 株式会社Ihi 流量可変バルブ機構および過給機
DE102019201357A1 (de) 2019-02-04 2020-08-06 Continental Teves Ag & Co. Ohg Vorrichtung zur Befestigung einer Luftfeder mit akustischer Entkopplung
USD993283S1 (en) 2021-12-07 2023-07-25 Specialty Auto Parts U.S.A., Inc. Valve cover for internal combustion engine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1263077A (en) * 1968-04-26 1972-02-09 John Vickers And Sons Ltd Improvements in machinery covers
EP0070500A1 (fr) * 1981-07-16 1983-01-26 Nissan Motor Co., Ltd. Montage de capot de culbuteurs
US4456268A (en) * 1982-09-30 1984-06-26 Allis-Chalmers Corp. Fastening means in sealed gasket assembly including shoulder bolt
US4571133A (en) * 1984-07-23 1986-02-18 General Motors Corporation Loading washer assembly

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027644A (en) * 1975-06-26 1977-06-07 Cummins Engine Company, Inc. Isolated engine cover
US4593659A (en) * 1985-06-28 1986-06-10 Cummins Engine Company, Inc. Engine valve cover
DE4221760C2 (de) * 1991-12-17 1996-07-11 Cr Elastomere Gmbh Körperschallisolierter Deckel, insbesondere für Brennkraftmaschinen
US5323740A (en) * 1993-07-13 1994-06-28 Saturn Corporation Molded dual cam cover
US5365901A (en) * 1993-11-15 1994-11-22 Freudenberg-Nok General Partnership Low creep flange and engine cover assembly
US5375569A (en) * 1994-01-26 1994-12-27 General Electric Company Multi polymer structures for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1263077A (en) * 1968-04-26 1972-02-09 John Vickers And Sons Ltd Improvements in machinery covers
EP0070500A1 (fr) * 1981-07-16 1983-01-26 Nissan Motor Co., Ltd. Montage de capot de culbuteurs
US4456268A (en) * 1982-09-30 1984-06-26 Allis-Chalmers Corp. Fastening means in sealed gasket assembly including shoulder bolt
US4571133A (en) * 1984-07-23 1986-02-18 General Motors Corporation Loading washer assembly

Also Published As

Publication number Publication date
US5655489A (en) 1997-08-12
ES2113703T3 (es) 1998-05-01
DE4434453C2 (de) 1996-07-18
KR100385249B1 (ko) 2003-08-14
DE4434453A1 (de) 1996-04-04
DE59501693D1 (de) 1998-04-30
KR960011102A (ko) 1996-04-20
JPH08114154A (ja) 1996-05-07
EP0704614B1 (fr) 1998-03-25
JP3683014B2 (ja) 2005-08-17

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