EP2225452B1 - Couvercle de culasse - Google Patents

Couvercle de culasse Download PDF

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Publication number
EP2225452B1
EP2225452B1 EP08866659.9A EP08866659A EP2225452B1 EP 2225452 B1 EP2225452 B1 EP 2225452B1 EP 08866659 A EP08866659 A EP 08866659A EP 2225452 B1 EP2225452 B1 EP 2225452B1
Authority
EP
European Patent Office
Prior art keywords
cylinder head
head cover
camshaft
bearing
connecting element
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
EP08866659.9A
Other languages
German (de)
English (en)
Other versions
EP2225452A1 (fr
Inventor
Robert Dunsch
Edwin Hartmann
Michael Kreisig
Stefan Ruppel
Jan Scheffel
Falk Schneider
Markus Walch
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.)
Mahle International GmbH
Original Assignee
Mahle International 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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2225452A1 publication Critical patent/EP2225452A1/fr
Application granted granted Critical
Publication of EP2225452B1 publication Critical patent/EP2225452B1/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
    • 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
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings
    • 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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • F01L2001/0535—Single overhead camshafts [SOHC]
    • 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
    • F01L2301/00—Using particular materials
    • 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

Definitions

  • the present invention relates to a cylinder head cover with a bearing device for supporting a camshaft in a cylinder head.
  • the invention also relates to an engine equipped with such a cylinder head cover.
  • a camshaft In today's internal combustion engines, basically two different arrangements of a camshaft have prevailed on a cylinder head.
  • the camshaft is received between the cylinder head and a so-called bearing frame, on which a corresponding number of screws a mostly made of plastic cylinder head cover is screwed.
  • a storage lane is formed by a respective bearing half shell in the cylinder head and in the bearing frame. The storage lane must be machined in the assembled state, marked and then dismantled to install the camshaft again.
  • this effort is faced with a number of assembly advantages, for example, the cylinder head can be set and bolted with associated bearing frame and staggered camshaft as a unit on the cylinder block.
  • the camshaft is already subjected to the forces of valve springs and kept in position by the stake out, thus enabling a precisely predefined position between crankshaft and camshaft.
  • a second variant is worked without a bearing frame, that is, the cylinder head cover, which, for example, die-cast aluminum is screwed directly onto the cylinder head.
  • the second variant comes out with significantly fewer parts, which must be expected due to the usually made of metal cylinder head cover with an increased noise emission.
  • Cylinder head covers with a bearing device are made JP2007315253 or US2004 / 144249 known.
  • the present invention is concerned with the problem of providing a cylinder head cover, with which in particular a simplified camshaft assembly can be achieved on the cylinder head.
  • the invention is based on the general idea, one of at least two bearing a camshaft bearing blocks and connecting element connecting this formed storage device as a prefabricated assembly and fasten together with a cylinder head cover as a whole in a single step on the cylinder head, without the cam shaft then again would have to be aligned.
  • the bearing device comprises at least the two aforementioned bearing blocks, which support the camshaft and the connecting element, which fixes the bearing blocks in mutually aligned position.
  • the camshaft penetrates the bearing blocks in each case in an axial first passage opening.
  • bearing device By forming the bearing device together with the camshaft to be stored as a prefabricated assembly, this can already at an early stage be prefabricated so that it must be grown together with the cylinder head cover on the cylinder head during assembly of the cylinder head, which in particular a complex and previously customary alignment of the individual bearing blocks with respect to the camshaft and possibly a required grinding a storage lane can be omitted in the bearing blocks.
  • the assembly consisting of camshaft, bearing blocks and connecting element thus forms an assembly aid for installing the bearing device in the cylinder head.
  • the bearing blocks mentioned above are threaded onto the camshaft in a correspondingly predefined distance and then aligned with respect to the camshaft. Thereafter, a setting of the individual bearing blocks on the connecting element, in particular a welding, so that the unit of camshaft, bearing blocks and connecting element, so the bearing device is prefabricated and can be arranged in a later assembly step together with the cylinder head cover on the cylinder head. It is conceivable that the cylinder head cover can be connected via corresponding connecting means with the bearing means, whereby the assembly of the now existing cylinder head cover and bearing unit on the cylinder head is very simple.
  • the connecting element is formed of metal and welded to the bearing blocks.
  • a connecting element a rigid sheet can be used, the rigidity of which is so great that bending and connected a storage inaccuracy of the individual bearing blocks with respect to the camshaft can be reliably avoided.
  • the welding between the bearing blocks and the connecting element can be carried out via procedurally simple to produce stapling points, which simultaneously ensure a secure and reliable fixation of the bearing blocks on the connecting element.
  • At least one bearing block is expediently provided with at least one second passage opening extending transversely to the first passage opening for the camshaft, which is aligned with a third passage opening arranged in the connecting element and which is designed to pass a screw defining the bearing device and thus the camshaft on the cylinder head.
  • the inventive arrangement of the different through holes allows simultaneous fixing of the connecting element, the associated bearing block and thus the camshaft on the cylinder head with compared to the prior art few screws, which can be significantly reduce in particular the variety of parts and thus the installation effort.
  • a separate fastening of a lower bearing shell and a bearing upper shell connected to the respectively separately required fastening means and a late reworking of the bearing shells with mounted camshaft can thus be omitted.
  • latching elements and / or latching contours are provided on the connecting element of the bearing device which the bearing device can be releasably secured together with the camshaft fixed to the cylinder head cover.
  • Such locking elements or latching contours may be formed in the form of clip elements and allow a simple clipping of the cylinder head cover on the bearing device.
  • the unit of cylinder head cover and bearing device together with the camshaft can be simply placed on the cylinder head and connected to it via corresponding fastening means, in particular screwed.
  • the Verclipsung between cylinder head cover and bearing device facilitates in particular the positioning of the two components to each other and the cylinder head and thereby simplifies the assembly process.
  • the locking elements can be molded in a simple manner by injection molding, that is, be made in one piece with the cylinder head cover.
  • the latching elements or the latching contours are arranged on the bearing device or on the cylinder head cover so that an attachment of the bearing device to the cylinder head cover in only one exactly predefined position is possible in which the subsequent assembly of the two components on the cylinder head is easily possible.
  • a cylinder head cover 1 has a bearing device 2 for mounting a camshaft 3.
  • the storage device 2 comprises at least two, according to the Fig. 1 a total of five, bearing blocks 4 and the individual bearing blocks 4 interconnecting connecting element 5.
  • the individual bearing blocks 4 have a first passage opening 6, through which the camshaft 3, which may be formed, for example, as a built camshaft, is passed.
  • cams 7 are lined up in a conventional manner and rotatably connected to the camshaft 3.
  • the bearing blocks 4 together with the connecting element 5 and the camshaft 3 a prefabricatable assembly, which is mounted together with the cylinder head cover 1 on a cylinder head, not shown.
  • the bearing blocks 4 may in principle be made of metal or of light metal, in particular of steel or aluminum, as well as the connecting element 5, wherein a connection between the connecting element 5 and the individual bearing blocks 4 usually takes place via a welded connection.
  • the cylinder head cover 1 is preferably made of plastic.
  • two passage openings 8 and 8 'extending transversely to the first passage opening 6 for the camshaft 3 are respectively provided on the bearing blocks 4, which each have corresponding thereto and arranged in the connecting element 5 third passage openings 9 and 9' and corresponding and in the cylinder head cover 1 arranged fourth passage openings 10 and 10 'are aligned, so that the bearing means 2 together with the cylinder head cover 1 via corresponding connecting means 11, for example screws 11, can be fixed to the cylinder head, not shown.
  • the connecting means 11 penetrate the cylinder head cover 1, the connecting element 5 and the respectively associated bearing block 4 and are screwed into a bore formed on the cylinder head.
  • one or more, in particular a fifth through-opening 12 may be provided in the connecting element 5, which is formed, for example, for receiving a component, in particular a sensor, not shown.
  • the bearing device 2 can be fixed according to the invention releasably fixed to the cylinder head cover 1 by 5 locking contours 13 are provided, for example, on the connecting element, which cooperate with corresponding and arranged on the cylinder head cover 1 Gegenrastkonturen 14, in particular locking elements 14 (see. Fig. 2a and 3 ).
  • the locking elements 14 are arranged on the connecting element 5 and the corresponding complementary thereto formed locking contours 13 on the cylinder head cover 1.
  • the locking elements 14, which, for example, according to the Fig. 2b are designed as latching hooks, arranged on the cylinder head cover 1 and can be produced together with this in a single step, provided that the cylinder head cover 1 is formed as an injection molded part made of plastic.
  • camshaft 3 In order to achieve the smoothest possible mounting of the camshaft 3 in the individual bearing blocks 4, can be provided beyond that in at least one bearing block 4, a camshaft 3 superimposed needle or roller bearings is provided. It is also conceivable that the camshaft 3 directly, that is stored without bearing rings in the bearing blocks 4.
  • the connecting means 11 are formed as screws 11, in particular as collar screws and have a hexagon on the end, which simplifies tightening the screw 11.
  • a decoupling element 15 is additionally provided, which in particular a vibration decoupling between the screw 11 on the one hand and cylinder head cover 1 should cause the other.
  • the decoupling element 15 is additionally designed as a sealing element and thereby prevents a lubricant present in the cylinder head, in particular oil, from escaping.
  • FIG. 2a If you look at Fig. 2a , so clearly the bearing device 2 with a total of five non-illustrated camshaft overlapping bearing blocks 4 can be seen.
  • the bearing device 2 is thereby inserted into the cylinder head cover 1 in a completely assembled state, ie together with the camshaft 3, from above, which has a corresponding opening 16 for this purpose.
  • the bearing device 2 rests against an opening edge 18 of the opening 16 via a preferably peripheral edge 17, or in which case, the bearing device 2 is in accordance with FIG Fig. 2b
  • Locking elements 14 shown fix the bearing device 2 in a precisely predefined position on the cylinder head cover 1.
  • a cylinder head cover 1 is shown, in which the bearing device 2 is supported exclusively on the edge 17, which is stepped, at an opening edge 18 of the cylinder head cover 1.
  • the step in the edge 17 causes an alignment of the bearing device 2 on the cylinder head cover 1.
  • An additional fixation via locking element 14 and locking contours 13 is not provided in this embodiment, but optionally possible.
  • the screws 11 penetrate the connecting element 5 of the bearing device 2, which at the same time forms an upper end of the cylinder head cover 1. With their end remote from the screw head 19, the screws 11 penetrate the individual bearing blocks 4 and protrude as far down from the bearing blocks 4 that they can be screwed into corresponding screw-in openings provided on the cylinder head (cf. Fig. 5 ). Also in accordance with the 4 and 5 illustrated embodiments, a subsequent alignment of the individual bearing blocks 4 with respect to the camshaft 3 is not required, since they are already aligned over the connecting element 5 to each other and the cylinder head cover 1.
  • Fig. 6 is a possible embodiment of a seal 20 shown in the manner of a sealing frame, whereby a leakage of oil from the cylinder head reliably prevented can be.
  • the screws 11 may be formed, for example, as expansion screws, which results in a corresponding rigidity during assembly by a direct metallic contact between the screw 11 on the one hand and the cylinder head.
  • the fourth passage openings 10 and 10 'in the cylinder head cover 1 are enclosed by the decoupling element 15 designed as a sealing element in such a way that a preferably complete acoustic decoupling between the cylinder head and the cylinder head cover 1 results.
  • a separate fastening of the cylinder head cover 1 and the bearing blocks 4 omitted on the cylinder head and both elements together via the same screws 11 can be fixed. This reduces the variety of parts and logistics costs. In particular, however, a time-consuming reworking or readjustment of the individual bearing blocks 4 can be omitted since these are already fixed and aligned with one another via the connecting element 5.

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

Claims (8)

  1. Couvercle de culasse (1) comprenant un système de support (2) pour le support d'un arbre à cames (3), dans lequel
    - le système de support (2) présente au moins deux paliers (4) logeant l'arbre à cames (3) et un élément de liaison (5),
    - les paliers (4) sont traversés de manière axiale par l'arbre à cames (3) à loger dans une première ouverture de passage (6) et sont fixés les uns par rapport aux autres dans une position orientée par l'intermédiaire de l'élément de liaison (5),
    - les paliers (4) forment, conjointement avec l'élément de liaison (5) et l'arbre à cames (3), un groupe modulaire préfabriqué,
    - le couvercle de culasse (1) peut être relié par l'intermédiaire de moyens de liaison au système de support (2), moyennant quoi l'unité désormais constituée du couvercle de culasse (1) et du système de support (2) peut être montée au niveau de la culasse,
    caractérisé en ce
    qu'est prévue, au niveau au moins d'un palier (4), au moins une deuxième ouverture de passage (8) s'étendant de manière transversale par rapport à la première ouverture de passage (6) pour l'arbre à cames (3), laquelle est alignée avec une troisième ouverture de passage (9) disposée dans l'élément de liaison (5) et une quatrième ouverture de passage (10) disposée dans le couvercle de culasse (1) et qui est réalisée pour le passage d'une vis (11) fixant au niveau de la culasse le couvercle de culasse (1), le système de support (2) et ainsi l'arbre à cames (3).
  2. Couvercle de culasse selon la revendication 1,
    caractérisé en ce
    - qu'au moins un des paliers (4) est fabriqué à partir de métal ou de métal léger, en particulier à partir d'acier ou d'aluminium, et/ou
    - que l'élément de liaison (5) est réalisé à partir de métal et est soudé aux paliers (4), et/ou
    - que le couvercle de culasse (1) est réalisé à partir de matière plastique.
  3. Couvercle de culasse selon la revendication 1 ou 2,
    caractérisé en ce
    qu'est prévue, dans l'élément de liaison (5), au moins une cinquième ouverture de passage (12), qui est réalisée afin de recevoir un composant, en particulier un capteur.
  4. Couvercle de culasse selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce
    que sont prévus, au niveau de l'élément de liaison (5), des éléments d'enclenchement (14) et/ou des contours d'enclenchement (13), par l'intermédiaire desquels le système de support (2) peut être fixé, conjointement avec l'arbre à cames (3), de manière amovible, au niveau du couvercle de culasse (1).
  5. Couvercle de culasse selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce
    - qu'au moins un palier (4) présente un roulement à aiguilles ou un roulement logeant l'arbre à cames (3), ou
    - que l'arbre à cames (3) est logé directement, c'est-à-dire sans bague de roulement, dans au moins un palier (4).
  6. Couvercle de culasse selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce
    qu'au moins une des vis (11) fixant au niveau de la culasse le couvercle de culasse (1), le système de support (2) et l'arbre à cames (3) est réalisée sous la forme d'une vis d'assemblage à embase, dans lequel un élément de découplage (15) étant prévu entre l'embase (21) de la vis (11) et le couvercle de culasse (1).
  7. Couvercle de culasse selon la revendication 6,
    caractérisé en ce
    que l'élément de découplage (15) est réalisé sous la forme d'un élément étanche.
  8. Moteur à combustion interne comprenant un couvercle de culasse (1) selon l'une quelconque des revendications 1 à 7.
EP08866659.9A 2007-12-31 2008-10-20 Couvercle de culasse Not-in-force EP2225452B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007063254A DE102007063254A1 (de) 2007-12-31 2007-12-31 Zylinderkopfhaube
PCT/EP2008/064114 WO2009083287A1 (fr) 2007-12-31 2008-10-20 Couvercle de culasse

Publications (2)

Publication Number Publication Date
EP2225452A1 EP2225452A1 (fr) 2010-09-08
EP2225452B1 true EP2225452B1 (fr) 2016-09-28

Family

ID=40152730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08866659.9A Not-in-force EP2225452B1 (fr) 2007-12-31 2008-10-20 Couvercle de culasse

Country Status (6)

Country Link
US (1) US9175636B2 (fr)
EP (1) EP2225452B1 (fr)
JP (1) JP5342564B2 (fr)
CN (1) CN101918694B (fr)
DE (1) DE102007063254A1 (fr)
WO (1) WO2009083287A1 (fr)

Cited By (1)

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WO2009083287A1 (fr) 2009-07-09
JP5342564B2 (ja) 2013-11-13
DE102007063254A1 (de) 2009-07-02
US20110005490A1 (en) 2011-01-13
US9175636B2 (en) 2015-11-03
CN101918694B (zh) 2012-11-14
JP2011508160A (ja) 2011-03-10
CN101918694A (zh) 2010-12-15
EP2225452A1 (fr) 2010-09-08

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