EP0170936A2 - Elément de commande d'un système d'entraînement des soupapes pour un moteur à combustion interne - Google Patents

Elément de commande d'un système d'entraînement des soupapes pour un moteur à combustion interne Download PDF

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Publication number
EP0170936A2
EP0170936A2 EP85108788A EP85108788A EP0170936A2 EP 0170936 A2 EP0170936 A2 EP 0170936A2 EP 85108788 A EP85108788 A EP 85108788A EP 85108788 A EP85108788 A EP 85108788A EP 0170936 A2 EP0170936 A2 EP 0170936A2
Authority
EP
European Patent Office
Prior art keywords
control element
element according
insert
thickness
connecting layer
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.)
Withdrawn
Application number
EP85108788A
Other languages
German (de)
English (en)
Other versions
EP0170936A3 (fr
Inventor
Dieter Dr. Dipl.-Ing. Fingerle
Gernot Habel
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.)
Feldmuehle AG
Original Assignee
Feldmuehle 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 Feldmuehle AG filed Critical Feldmuehle AG
Publication of EP0170936A2 publication Critical patent/EP0170936A2/fr
Publication of EP0170936A3 publication Critical patent/EP0170936A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F7/0087—Ceramic materials
    • 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
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0865—Oxide ceramics
    • F05C2203/0895—Zirconium oxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20576—Elements
    • Y10T74/20882—Rocker arms

Definitions

  • the present invention relates to a control element made of metal for the valve train of an internal combustion engine, which has an insert made of ceramic material on its working surface which is in engagement with the cams of a camshaft.
  • a control element is understood to mean valve tappets, rocker arms, rocker arms, rocker arms and bucket tappets.
  • Control elements of the type mentioned, in particular valve lifters are known from DE-A 32 05 878, 32 39 325 and 33 32 455.
  • DE-A 32 39 325 specifies as fastening options for the ceramic insert, shrinking, clamping, gluing or pouring into cast aluminum, while according to DE-A 32 05 878 and DE-A 33 32 455 gluing with epoxy resin is provided.
  • the proposal is known to fix ceramic inserts on the metallic control elements by means of soldered connections gen. All these proposals still have certain disadvantages, so that despite the inherent properties of the ceramic materials, control elements with an insert made of ceramic material could not yet prevail.
  • Adhesive connections that have sufficient and permanent strength compared to water-containing lubricants even at 150o C show among the adhesive connections present in an engine that have sufficient and permanent strength against water-containing lubricants even at 150o C, show among the in insufficient strength in an engine.
  • Epoxy resin bonds that have shear strengths of 20-40 MPa, which are not measured in the medium, have not proven to be sufficiently safe. When exposed to oil and water, a decrease of up to 50% can be observed.
  • Solder connections between ceramic inserts and metallic control elements, the shear strength of which is even higher - approx. 100 MPa are only possible if the expansion coefficients of the metal and the ceramic insert are close to each other.
  • soldered connections are the high temperatures of 800 - 900oC required to produce the soldered joint. Areas of the metallic control element that have already been coated can be impaired. The necessary work in vacuum or under protective gas, the energy consumption required by the high temperatures and the expensive, silver-containing soldering materials are also disadvantageous.
  • the object of the present invention is to improve the bond strength with the ceramic insert in a control element of the type described at the outset in such a way that sufficient strength is ensured even under heavy and prolonged use. Furthermore, the invention intends to expand the possible combinations of the metallic and ceramic material components and to create the economic prerequisites which are absolutely necessary for series production in the form of simple and problem-free manufacture.
  • the invention provides the characterizing features of claim 1 in a control element of the type described in the introduction.
  • metallic control elements include corresponding components made of cast iron, steel, aluminum or to understand corresponding conventional alloys.
  • the insert is attached to the control element by a connecting layer consisting of separate areas.
  • a connecting layer consisting of separate areas.
  • an uninterrupted connection layer is preferred in order to achieve a particularly good bond and for manufacturing reasons.
  • An uninterrupted connection layer has proven to be particularly suitable in this case, in which regions of greater thickness, which are geometrically regular, are arranged next to regions of reduced thickness.
  • the areas of greater thickness are in the range of 0.2-1 mm, preferably they have a thickness of 0.4-0.8 mm. Areas of this thickness on the one hand achieve excellent bond strength and on the other hand avoid excessive elastic deformation.
  • the areas of reduced thickness have a thickness of 0.01-0.05 mm.
  • the connecting layer consists of a fluorine-containing elastomer, with fluorosilicone rubber, copolymers of vinylidene fluoride and chlorotrifluoroethylene being preferred.
  • Elastomers based on vinylidene fluoride-hexafluoropropylene have proven to be very particularly suitable. Mixtures of the components mentioned are also very suitable. The elastomers mentioned guarantee a particularly good connection between the control element and the ceramic insert under the influence of high temperatures and when exposed to the usual engine oils and lubricants.
  • the intermediate layer consists of nitrile rubber, polyacrylate rubber or epichlorohydrin rubber. These types of rubber or polymers are less expensive and have proven to be sufficient for various fields of application. Due to their insufficient oil resistance, elastomers based on butadiene styrene and natural rubber have not proven to be suitable.
  • a particularly good and secure connection of the insert piece to the control element is achieved if, according to a particularly preferred embodiment, the insert piece, on its underside provided for connection to the control element, has geometrically formed elevations and Has recesses.
  • an uninterrupted connection layer is used, the areas of which are of greater thickness in the recesses and whose areas of less thickness are arranged on the elevations on the underside of the insert.
  • the insert is flat on its underside.
  • elevations or recesses which is preferably carried out in the form of grooves or webs, has proven to be particularly effective because the forces exerted as directly as possible are thereby introduced into the metallic part of the control element. It has proven particularly suitable to arrange the grooves or webs on the underside of the insert or on the control element in such a way that they extend in the longitudinal direction of the load profile, i.e. run parallel to the direction of rotation of the cams. This constructive measure is preferred because it has been shown that grooves or webs arranged at right angles to the cams had less high stand times of the insert as a result of the high bending stress occurring in the ceramic inserts in this case.
  • the partially stabilized zirconium oxide which is already known for the application in question, but also mixtures containing aluminum oxide and zirconium oxide, such as those e.g. are described in DE-PS 27 44 700, silicon carbide, silicon nitride or silicon oxynitride are also used. Possibly. can these ceramic materials also other known additives, such as Contain magnesium oxide, yttrium oxide, titanium carbide and titanium nitride.
  • the present invention also allows materials to be combined with one another which, because of their different coefficients of thermal expansion, have not hitherto been able to be used for the application area mentioned.
  • connection layer The application of the elastomeric connection layer, its vulcanization and the connection of the individual components are carried out in a manner known per se under the action of heat and pressure, without the risk of damage to areas of the control element which have already been tempered, as in the soldering method described at the beginning. This is ensures economical production.
  • Figure 1 shows a control element 1 according to the invention in the form of an oscillating lever made of cast steel for engines with an overhead camshaft.
  • a ceramic insert 2 made of zirconium oxide stabilized with magnesium oxide is fixed by stops 6 and forms the working surface for a cam.
  • the control element 1 has a bearing 8 for receiving a not shown Ball stud.
  • a hardened tip 9 is used to actuate a valve stem, not shown.
  • FIG. 2 shows the top view of the control element 1 according to FIG. 1 with the insert 2 fixed by stops 6. Dashed lines show the course of the grooves 7a and webs 5a in the direction of rotation of the cam.
  • FIG. 3 is a sectional view along line III-III of FIG. 1 and shows the control element 1 with the ceramic insert 2, which is connected to the control element 1 by an elastomeric connection layer 3 consisting of continuous areas in the form of regularly extending strips at the connection point 12 .
  • the elastomeric layer 3 has regions 10 of greater thickness, of 0.5 mm thickness, which are introduced into grooves 7a arranged on the underside 4 of the insert 2, while the elastomeric connecting layer 3 has a thickness in its regions 11 of lesser thickness on the webs 5a of 0.05 mm.
  • the elastomeric connecting layer 3 consists of a copolymer based on vinylidene fluoride / hexafluoropropylene (FKM), which was used to connect the insert 2 with the composite point 12 of the control element 1 under the action of heat and pressure. A shear strength of 3 MPa was measured.
  • FIG. 5 shows an embodiment of the control element 1 according to the invention, the ceramic insert 2 not yet being installed.
  • elevations 13 in the form of webs 13a and recesses 14 in the form of grooves 14a are attached to the top of the control element 1 to form the connection point 12.
  • FIG. 6 A further embodiment of the ceramic insert 2 is shown in FIG. 6, this embodiment having a multiplicity of webs 5a or grooves 7a on the underside 4 of the insert 2 compared to the embodiment shown in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Valve Device For Special Equipments (AREA)
EP85108788A 1984-08-08 1985-07-13 Elément de commande d'un système d'entraínement des soupapes pour un moteur à combustion interne Withdrawn EP0170936A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3429169A DE3429169C1 (de) 1984-08-08 1984-08-08 Steuerelement fuer den Ventiltrieb eines Verbrennungsmotors
DE3429169 1984-08-08

Publications (2)

Publication Number Publication Date
EP0170936A2 true EP0170936A2 (fr) 1986-02-12
EP0170936A3 EP0170936A3 (fr) 1987-03-11

Family

ID=6242585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85108788A Withdrawn EP0170936A3 (fr) 1984-08-08 1985-07-13 Elément de commande d'un système d'entraínement des soupapes pour un moteur à combustion interne

Country Status (5)

Country Link
US (1) US4643144A (fr)
EP (1) EP0170936A3 (fr)
JP (1) JPS6146405A (fr)
DE (1) DE3429169C1 (fr)
ES (1) ES288602Y (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437303A3 (en) * 1987-03-24 1991-07-31 Ngk Insulators, Ltd. Ceramic materials to be insert-cast and ceramic port liners
EP0461641A3 (fr) * 1990-06-13 1994-02-09 Matrix Science Corp

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983468A (en) * 1986-07-11 1991-01-08 Ngk Insulators Ltd. Metallic slide members to be used with ceramic slide members and sliding assemblies using the same
DE3715758A1 (de) * 1987-05-12 1988-12-01 Daimler Benz Ag Ventilbetaetigungshebel fuer brennkraftmaschinen
DE3735589A1 (de) * 1987-10-21 1989-05-03 Daimler Benz Ag Ventilbetaetigungshebel aus leichtmetall mit eingegossenem gleitkoerper aus oxid- oder nitridkeramik sowie verfahren zu seiner herstellung
JPH02134350U (fr) * 1989-04-12 1990-11-07
US4961407A (en) * 1989-04-24 1990-10-09 Competition Cams, Inc. Rocker arm with a cost push rod seat
US4966108A (en) * 1989-04-28 1990-10-30 Cummins Engine Company, Inc. Sintered ceramic ball and socket joint assembly
US5185923A (en) * 1989-06-16 1993-02-16 Ngk Spark Plug Co., Ltd. Method of making a frictionally sliding component
DE4031549C1 (fr) * 1990-10-05 1991-09-19 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
JP3362866B2 (ja) * 1992-04-06 2003-01-07 日産自動車株式会社 動弁装置およびバルブリフタ
US5361648A (en) * 1992-04-07 1994-11-08 Nsk Ltd. Rolling-sliding mechanical member
US5279211A (en) * 1992-04-24 1994-01-18 Cummins Engine Company, Inc. Mechanically retained wear-resistant ceramic pad
US5231959A (en) * 1992-12-16 1993-08-03 Moog Controls, Inc. Intake or exhaust valve actuator
US5890413A (en) * 1997-01-08 1999-04-06 Generac Portable Products, Llc Piston for water pump and related method
US8919312B2 (en) * 2012-06-27 2014-12-30 Ford Global Technologies, Llc Impact dampening tappet
US8985077B2 (en) 2013-03-08 2015-03-24 Ford Global Technologies, Llc Valvetrain impact absorber
KR102595545B1 (ko) * 2022-12-09 2023-10-30 주식회사 엠쓰리시스템즈 모듈 길이조절부재

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB213453A (en) * 1923-05-07 1924-04-03 Edward Grant Evezard Improvements in connection with the tappets of internal combustion and other engines
DE745737C (de) * 1939-11-30 1944-04-25 Adolf Roebig Ventilstoessel, insbesondere fuer Brennkraftmaschinen
FR911367A (fr) * 1945-06-09 1946-07-05 Renault Perfectionnements à la commande des soupapes des moteurs à combustion interne
US3690958A (en) * 1966-02-24 1972-09-12 Lamb Co F Jos Rocker arm
JPS578308A (en) * 1980-06-18 1982-01-16 Toyota Motor Corp Rocker arm with ceramic pad
JPS6034624B2 (ja) * 1980-12-24 1985-08-09 日立粉末冶金株式会社 内燃機関の動弁機構部材
US4768476A (en) * 1981-02-20 1988-09-06 Stanadyne, Inc. Tappet with ceramic camface
JPS5815705A (ja) * 1981-07-22 1983-01-29 Komatsu Ltd タペツトの製造法
JPS5939909A (ja) * 1982-08-30 1984-03-05 Toyota Motor Corp セラミツクパツド付ロツカア−ム
AU1797383A (en) * 1982-09-30 1984-04-05 Stanadyne Inc. Tappet with ceramic camface
DE3239325A1 (de) * 1982-10-23 1984-04-26 Feldmühle AG, 4000 Düsseldorf Ventilstoessel fuer einen verbrennungsmotor
JPS59101566A (ja) * 1982-12-03 1984-06-12 Ngk Insulators Ltd エンジン部品
JPS59162310A (ja) * 1983-03-08 1984-09-13 Mitsubishi Motors Corp ロツカア−ム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0437303A3 (en) * 1987-03-24 1991-07-31 Ngk Insulators, Ltd. Ceramic materials to be insert-cast and ceramic port liners
EP0461641A3 (fr) * 1990-06-13 1994-02-09 Matrix Science Corp

Also Published As

Publication number Publication date
ES288602Y (es) 1986-09-16
JPS6146405A (ja) 1986-03-06
DE3429169C1 (de) 1986-01-16
EP0170936A3 (fr) 1987-03-11
ES288602U (es) 1986-01-16
US4643144A (en) 1987-02-17

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Inventor name: FINGERLE, DIETER, DR. DIPL.-ING.

Inventor name: HABEL, GERNOT