EP2250362B1 - Nockenwellenmodul - Google Patents

Nockenwellenmodul Download PDF

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Publication number
EP2250362B1
EP2250362B1 EP09705666A EP09705666A EP2250362B1 EP 2250362 B1 EP2250362 B1 EP 2250362B1 EP 09705666 A EP09705666 A EP 09705666A EP 09705666 A EP09705666 A EP 09705666A EP 2250362 B1 EP2250362 B1 EP 2250362B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
cylinder head
bearing
head cover
module
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
EP09705666A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2250362A1 (de
Inventor
Mario Ilgeroth
Andreas Freytag
Alexander Langer
Henrik Wagner
Stefan Retzlaff
Jorge Manuel Miranda Soares
Norbert Schuling
Hans Janssen
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.)
Polytec Plastics Germany GmbH and Co KG
Thyssenkrupp Dynamic Components Teccenter AG
Original Assignee
Polytec Plastics Germany GmbH and Co KG
ThyssenKrupp Presta TecCenter 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 Polytec Plastics Germany GmbH and Co KG, ThyssenKrupp Presta TecCenter AG filed Critical Polytec Plastics Germany GmbH and Co KG
Publication of EP2250362A1 publication Critical patent/EP2250362A1/de
Application granted granted Critical
Publication of EP2250362B1 publication Critical patent/EP2250362B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01L1/02—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
    • 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
    • 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
    • F01L2001/0537—Double overhead camshafts [DOHC]
    • 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 invention relates to a preassembled camshaft module having the features of the preamble of claim 1.
  • a camshaft module is from the German utility model DE 201 20 912 U1 known.
  • a cylinder head cover is provided which integrally has associated with it first bearing halves for the camshaft bearing of a camshaft.
  • the camshafts are inserted into the first bearing halves integrally formed with the cylinder head cover and the second bearing halves are screwed.
  • the individual components cylinder head cover, camshaft and second bearing halves are pre-assembled into a module.
  • This preassembled camshaft module or cylinder head cover module can then be mounted on the cylinder head as a whole.
  • the camshafts receiving the first bearing halves are formed integrally with the cylinder head cover.
  • the cylinder head cover for example, can not be made of plastic, but it must be made of a material that is suitable for the bearing halves for supporting the camshaft and has sufficient strength. Therefore, the cylinder head cover according to DE 201 20 912 U1 made of a suitable metal, such as aluminum.
  • a further disadvantage is that the integrally formed with the cylinder head cover bearing halves must be machined consuming to achieve the necessary for the storage of the camshaft dimensions, tolerances and surface quality.
  • the publication DE 198 31 772 A 1 does not disclose a preassembled camshaft module.
  • claim 1 of DE 198 31 772 A 1 indicates that the cam elements 5 of the camshaft are larger than the bores 16 in which the camshaft is rotatably supported. This leads to the fact that "the camshaft can only be assembled rotationally in the cylinder head".
  • the bearing frame 13 and the lid 12 thus do not form a preassembled unit with fully assembled camshaft.
  • From the DE 198 31 772 A1 is known to store two adjacent camshafts in a bearing frame, wherein, for example, in the embodiment according to Fig. 3 the webs 15 are arranged opposite one another.
  • the assembly of a cylinder head according to DE 198 31 772 A1 is complicated and complicated because no pre-assembled camshaft module can be used.
  • the invention has for its object to provide a preassembled camshaft module according to the preamble of claim 1 is available, in which the pre-assembly of the module and its attachment to the cylinder head is simple, fast and with as few fasteners possible.
  • a cylinder head cover made of plastic.
  • the camshaft is received rotatably supported in separate bearing blocks, and that these bearing blocks are connected to each other at individual attachment points with the cylinder head cover via a fastening means.
  • the camshaft module is firmly connected to the abovementioned fastening points via the same aforementioned fastening means with the cylinder head of the internal combustion engine.
  • the fastening means may be formed as screws. In this way, only one set of screws is needed to pre-assemble the camshaft module and then screw it firmly to the cylinder head.
  • the invention is applicable to engines with multiple camshafts.
  • camshaft modules are used with two parallel camshafts.
  • each camshaft is rotatably received via a plurality of bearing blocks in such camshaft modules, wherein each two bearing blocks of each camshaft adjacent to each other and are arranged in alignment with each other in a plane which is transverse to the longitudinal axis of the camshaft.
  • Each pair of adjacent, mutually aligned bearing blocks is connected via only three attachment points with the cylinder head cover.
  • the camshaft module is also bolted to these three attachment points with the cylinder head.
  • a fastening point and thus also a screw is saved by this inventive solution per bearing block pair.
  • the camshaft module according to the invention has at least two camshafts.
  • the bearing blocks can be designed as individual bearing blocks or as so-called double bearing blocks. If they are designed as individual bearing blocks, then the individual bearing blocks can be designed so that they can be connected to one another.
  • the bearing blocks may be formed as a split or as a closed (one-piece) bearing blocks.
  • camshaft module preassembled in this way is then mounted on the cylinder head and fastened to the cylinder head with the same fastening means, that is to say for example with the same screws which are used for pre-assembly of the camshaft module.
  • one or more plug connections can be provided, by which the bearing blocks receiving the camshafts can be connected to the cylinder head cover, i. are pluggable.
  • the bearing blocks together with the camshaft are first simply plugged together with the cylinder head cover and thereby held together positively, positively or force and form-fitting manner. This mating provides a preliminary assembly of the camshaft module. Then, the bolts are attached to produce the finished preassembled camshaft module.
  • the fastening means are designed as screws, then the screws are preferably inserted or screwed through through bores of the bearing blocks, so that they connect the bearing blocks and the camshafts mounted in the bearing blocks to the cylinder head cover.
  • camshaft module is then subsequently screwed via the same screws with the cylinder head.
  • This assembly of the camshaft module on the cylinder head of the engine is usually only at the vehicle manufacturer in the assembly line for the assembly of the individual engine components.
  • the supplier of the module can thus provide the vehicle manufacturer with a module which can be delivered ready for installation to the assembly line of the vehicle manufacturer.
  • the screws required for mounting the module on the cylinder head are already present and integrated into the pre-assembled module. It is therefore not necessary for the vehicle manufacturer, in turn vorzuhalten screws for mounting the module on the cylinder head and provide on the assembly line.
  • camshaft module according to the invention is removable so that the cylinder head cover can be removed without the camshaft would have to be removed with.
  • the camshafts are freely accessible eg for customer service. This is an important advantage over that from the DE 201 20 912 U1 known camshaft module in which the cylinder head cover can not be removed separately from the camshaft because of the integrally formed with the cylinder head cover bearing halves.
  • the solution according to the invention allows the use of both split and non-split bearing blocks.
  • Non-split pedestals must be pushed onto the shaft body of the camshaft during assembly of the camshaft.
  • split bearing blocks can also be mounted on the camshaft after assembly.
  • the present invention enables the realization of small bearing diameters, i. It can be used bearing blocks whose outer diameter is smaller than the radial extent of the cam of the camshaft. In this way, large bearing diameter, which have a higher friction power than small bearing diameter can be avoided.
  • one or more connectors can be provided, via which the cylinder head cover and the camshaft receiving bearing blocks can be connected to each other. After mating the connectors, the cylinder head cover and the bearing blocks are non-positively, positively or positively and positively connected. The pre-fixed in this way components can then be connected by screwing or inserting the screws together so that the screws hold the individual module components together.
  • receiving bushes are provided on the bearing blocks at the points of attachment points, which may have an internal thread into which the screws are screwed.
  • the receiving sleeves must, however, have no internal thread. It is sufficient, only a single thread in the receiving sleeve so that the screw can be tightened sufficiently to hold the module components together. It would also be conceivable, instead of a thread or a single thread over the choice of suitable tolerances, the holes of the receiving sleeves to be dimensioned so that the screws are merely inserted and hold the module components non-positively and / or positively.
  • the two modules of the camshaft module namely the cylinder head cover and the camshaft (s) are held together with the bearing blocks in the preassembled state so that they can be delivered to the assembly line for the cylinder head assembly at the customer and there with the same fasteners can be attached to the cylinder head, with which the camshaft module is held together.
  • the receiving sleeves can serve as joining partners of such a plug connection and be used for these purposes.
  • the cylinder head cover has recesses at the attachment points through which the receiving sleeves pass. Therefore, the aforementioned plug connection between the cylinder head cover and bearing blocks can be realized in a simple manner between the recesses and the receiving sleeves.
  • the cylinder head cover is acoustically decoupled from the bearing blocks and the cylinder head of the engine. Sound waves are not transmitted to the cylinder head cover because of the elastomer rings, so that no unwanted noise such as noise is generated. Roaring over the cylinder head cover can be generated or passed on.
  • the cylinder head cover is advantageously made of plastic.
  • this can save weight in the Comparison with cylinder head covers made of aluminum or other metals.
  • Fig. 1a the camshaft module according to the invention is shown in the preassembled state in a perspective view.
  • the cylinder cover 1 is held together with the bearing blocks 5 via screws 8.
  • the bearing blocks 5 take the camshafts 2 rotatably mounted in it.
  • the bearing blocks 5 are formed as completely separate from the cylinder head cover 1 formed bearing elements.
  • the bearing blocks 5 are connected at individual attachment points 4 via the screws 8 with the cylinder head cover 1.
  • a total of 15 attachment points 4 are present at which the cylinder head cover 1 is connected to the bearing blocks 5 via the screws 8.
  • Fig. 1a are for reasons of clarity, only the outer rows of attachment points 4 marked with reference numerals.
  • the arranged between the two camshafts 2 series of attachment points 4 is not marked with reference numerals.
  • the two mutually adjacent bearing blocks 5 of the respective camshaft are connected to each other via a common screw 8.
  • the mutually adjacent bearing blocks 5 of the camshaft 2 have in the area between the two camshafts on an overlap region in which overlap the two bearing blocks.
  • middle row of screws 8 thus pierces in the overlap region both adjacent bearing blocks 5, so that in this overlap area both bearing blocks are connected via a single screw with the cylinder head cover 1.
  • overlapping bearing blocks 5 could also differ from the in Fig. 1a illustrated embodiment, a one-piece double bearing block are used. In this case, no overlapping region as in the illustrated embodiment would be present, but the two camshafts receiving bearing openings would be integrally connected to each other via a connecting portion. In this connection area could then be provided a hole for the passage of the screws 8, but it would also be possible to dispense with the screws 8 in the connection area completely and the double bearing blocks only with the in Fig. 1a each outside arranged screws 8 to connect with the cylinder head cover 1 ..
  • camshaft module can be supplied by the automotive supplier as a completely pre-assembled module to the vehicle manufacturer, and this camshaft module can then be screwed as it is directly on the assembly line on the cylinder head of the engine. For the vehicle manufacturer, it is not necessary to provide separate mounting screws for the assembly of the camshaft module at the assembly workstation. This simplifies the assembly of the camshaft module according to the invention on the cylinder head compared to known camshaft modules, such as those from the DE 201 20 912 U1 known camshaft module.
  • the cylinder head cover 1 is made of plastic. This is readily possible because the bearing blocks 5 rotatably supporting the camshafts 2 are designed as bearing elements which are designed to be completely separate from the cylinder head cover.
  • the bearing blocks 5 are preferably formed of metal.
  • Fig. 1b is the camshaft module after Fig. 1a shown in an exploded view.
  • This illustration is used to better understand the structure of the camshaft module.
  • the bearing blocks 5 and the cylinder head cover 1 form separate components that can be connected via the screws 8 together to form a preassembled camshaft module.
  • a recess 5a or 5b is provided in each bearing block 5.
  • These recesses 5a, 5b are dimensioned so that in the assembled state, the recesses 5a, 5b complement each other to a full material thickness of the bearing block.
  • the bearing blocks 5 have 4 receiving sleeves 9 for receiving the screws 8 at the attachment points.
  • the receiving sleeves 9 are equipped in the illustrated embodiment with an internal thread, so that the screws 8 in the Receptacles 9 can be screwed.
  • the screws would form a frictional and / or positive connection between the assembly camshafts 2 with bearing blocks 5 and cylinder head cover 1.
  • sealing rings 20 are arranged, which surround the receiving sleeves 9. These sealing rings 20 are used for acoustic decoupling of the cylinder head cover 1, because by the sealing rings 20 a sound bridge between the cylinder head cover 1 and cylinder head is avoided.
  • a circumferential seal 30 is shown, which ensures the seal against the cylinder head in the assembled state of the camshaft module.
  • Fig. 1 c is a perspective view of the camshaft module according to Fig. 1a shown in pre-assembled state.
  • the bearing blocks 5 connected to the cylinder head cover 1 have a planar mounting surface 40. These flat mounting surfaces 40 are supported on corresponding mating surfaces of the cylinder head, when the camshaft module is bolted to the cylinder head.
  • the cylinder head cover 1 has flanges 51, 52, 53, on which the seal 30 is mounted.
  • the flanges 51, 52, 53 are supported on respective mating surfaces of the cylinder head when the camshaft module is mounted, and the gasket 30 seals the space trapped between the cylinder head and the cylinder head cover 1 to the outside.
  • the flanges 51, 52, 53 thus form contact surfaces of the cylinder head cover 1, with which it is in the assembled state in contact with the (not shown) cylinder head.
  • Fig. 2 is a cross section through two mutually adjacent bearing blocks 5 of the camshaft module according to Fig. 1a shown.
  • the two mutually adjacent bearing blocks 5 are aligned with each other in a direction transverse to the longitudinal axis of the camshafts 2 level.
  • Each camshaft module takes a camshaft 2 rotatably mounted in it.
  • the cylinder head cover 1 has recesses 10 which receive the receiving sleeves 9 of the bearing blocks 5 in itself.
  • the receiving sleeves 9 have internal threads into which the screws 8 are screwed. In this way, the component group formed from bearing blocks 5 and camshafts 2 is held together with the cylinder head cover 1.
  • sealing rings 20 are arranged, through which the cylinder head cover 1 is acoustically decoupled from the bearing blocks 5 and thus from the cylinder head.
  • a sealing ring 41 is arranged between the screws 8 have a collar 8a and that between the collar 8a of the screws 8 and the cylinder head cover 1, a sealing ring 41 is arranged. This sealing ring 41 serves to seal the space enclosed by the cylinder head cover 1 interior relative to the environment.
  • the side flanges 51 and 53 are shown in FIG Fig. 2 also easy to recognize. They carry the seal 30, which serves to seal the area enclosed by the cylinder head cover 1 and the cylinder head, not shown, interior to the environment.
  • Fig. 2 shows, the bearing blocks 5 planar mounting surfaces 40 which are supported on corresponding mating surfaces of the cylinder head, not shown, when the camshaft module is mounted on the cylinder head.
  • the screws 8 For fixing the camshaft module on the cylinder head, it is only necessary to screw the screws 8 into corresponding threaded holes in the cylinder head. Additional fixing screws are not required.
  • Fig. 3 is a longitudinal section through a camshaft 2 according to Fig. 1a respectively.
  • Fig. 2 shown.
  • the camshaft is formed with a tubular shaft body.
  • a camshaft can be used, which is designed as a solid shaft.
  • the spatially arranged behind the camshaft 2 screws 8 can be seen, which are screwed into the non-visible receiving sleeves 9 of the bearing blocks 5.
  • the in Fig. 3 bearing block 5 shown on the far right outside has lugs 70 extending in the longitudinal direction of the camshaft 2.
  • the lugs 70 are clamped between a camshaft component 71 mounted on the camshaft 2 and the radial collar 73 of a sealing plug 74 pressed into the tubular shaft body of the camshaft 2.
  • the closure plug 74 has a central threaded bore 75 into which a closure element or drive element, not shown, can be screwed.
  • Fig. 4 shows a cross section through an inventive camshaft module in one embodiment for two parallel camshafts, wherein between the receiving sleeves 9 and provided in the cylinder head cover 1 recesses 10 elastomer rings 6, 7 are arranged. These elastomeric rings cause an acoustic decoupling of the cylinder head cover from the bearing blocks and the cylinder head of the engine.
  • the bearing block 50 is formed in this embodiment of the invention as a one-piece double bearing block having two bearing openings 51, 52. These bearing openings 51, 52 are connected to each other via a connecting region. In the connection region, an attachment point 4 is provided, which is formed analogously to the outer two attachment points 4.
  • Fig. 5a is an in Fig. 1a externally arranged attachment point 4 shown in an enlarged view.
  • the receiving sleeve 9 serves directly as a "centering pin", which fits exactly into the recess 10 in the cylinder head cover 1.
  • Good to see is also the sealing ring 20 which is arranged between the bearing block 5 and the cylinder head cover 1, and the sealing ring 41, which is arranged between the cylinder head cover 1 and the collar 8a of the screw 8.
  • Fig. 5b shows the enlarged view of an attachment point in the overlapping region of two mutually adjacent bearing blocks 5 ', 5 ".
  • the bearing block 5' has a receiving sleeve 9 ', which engages in a recess of the bearing block 5".
  • the bearing block 5 in turn also has a receiving sleeve 9" which is aligned coaxially with the receiving sleeve 9 '.
  • the two part-receiving sleeves 9 ', 9 “complement each other to a receiving sleeve 9 receiving the screw 8.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP09705666A 2008-01-31 2009-01-28 Nockenwellenmodul Not-in-force EP2250362B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008007091A DE102008007091B4 (de) 2008-01-31 2008-01-31 Nockenwellenmodul
PCT/EP2009/000533 WO2009095215A1 (de) 2008-01-31 2009-01-28 Nockenwellenmodul

Publications (2)

Publication Number Publication Date
EP2250362A1 EP2250362A1 (de) 2010-11-17
EP2250362B1 true EP2250362B1 (de) 2012-12-26

Family

ID=40591906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09705666A Not-in-force EP2250362B1 (de) 2008-01-31 2009-01-28 Nockenwellenmodul

Country Status (7)

Country Link
US (1) US8590499B2 (ja)
EP (1) EP2250362B1 (ja)
JP (1) JP5409654B2 (ja)
KR (1) KR101503961B1 (ja)
CN (1) CN101970841B (ja)
DE (1) DE102008007091B4 (ja)
WO (1) WO2009095215A1 (ja)

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US8534251B2 (en) * 2010-05-17 2013-09-17 GM Global Technology Operations LLC Engine assembly with camshaft housing

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US8590499B2 (en) 2013-11-26
KR20100110773A (ko) 2010-10-13
DE102008007091B4 (de) 2010-06-24
US20110041790A1 (en) 2011-02-24
CN101970841A (zh) 2011-02-09
JP2011511200A (ja) 2011-04-07
CN101970841B (zh) 2014-09-03
WO2009095215A1 (de) 2009-08-06
EP2250362A1 (de) 2010-11-17
JP5409654B2 (ja) 2014-02-05
DE102008007091A1 (de) 2009-08-06
KR101503961B1 (ko) 2015-03-18

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