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
  • F02F1/00—Cylinders; Cylinder heads 
  • F02F1/24—Cylinder heads
• • 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

Definitions

• the present invention relates to a cylinder head cover for a cylinder head of a reciprocating engine.
• the invention also relates to a piston engine equipped with such a cylinder head cover.
• a piston engine usually consists of an engine block in which cylinders are formed, in which pistons of the piston engine are arranged to be adjustable in stroke.
• Below the engine block usually includes a crankcase, in which a crankshaft is rotatably mounted, which is drivingly connected via connecting rods with the piston.
• At the bottom of the crankcase usually includes an oil pan.
• At the top of the engine block usually connects to a cylinder head, which covers the individual cylinders up and containing the communicating with the cylinders intake ports and exhaust ports.
• charge exchange valves are usually arranged.
• camshafts for driving the charge exchange valves are usually mounted on the cylinder head.
• At the top of the cylinder head is a cylinder head cover which covers the cylinder head and the components arranged on it.
• fuel injectors may be attached, which can inject fuel through the cylinder head cover and through the cylinder head into the cylinder.
• Such a cylinder head cover is expediently equipped with a certain pressure stability, for example, to be able to safely absorb an increased internal pressure, which can arise in an enclosed between the cylinder head cover and the cylinder head interior, for example by so-called "blow-by gas".
• Blow-by gas is created during operation of the reciprocating engine in that during the explosions within the combustion chambers,
• piston seals can pass from the respective cylinder into the crankcase and increase the pressure there.
• the crankcase is fluidly connected through the engine block and through the cylinder head with the aforementioned interior, so that there, too, the pressure can rise.
• a certain stability may be required if additional components to be mounted on the cylinder head cover, such as fuel injectors or a fuel pump or the like.
• a skeleton assumes the supporting function and this skeleton is enclosed by an enveloping structure.
• the skeleton can be made of a high-strength plastic, in particular of a glass fiber reinforced polyamide.
• the enveloping structure can be made of a simple, inexpensive plastic. The problem with such a composite construction is the resulting material mix, which makes recycling of the cylinder head cover difficult. In particular, the different plastics must first be separated so that they can subsequently be recycled.
• the present invention is concerned with the problem of providing for a cylinder head cover or for a piston engine equipped therewith an improved embodiment, which is characterized in particular by a high stability of the cylinder head cover, so that the cylinder head cover is particularly suitable for growing other components. Furthermore, at the same time a later recycling of the cylinder head cover should be simplified. In addition, a simple manufacturability is desired.
• This problem is solved according to the invention by the subject matter of the independent claim.
• Advantageous embodiments are the subject of the dependent claims.
• the invention is based on the general idea to equip the cylinder head cover with a hood body and with a separate holding bridge, both the hood body and the holding bridge are each provided for mounting on the cylinder head.
• the hood body is equipped with an outer hood seal for sealing the hood body with respect to the cylinder head, said outer hood seal along an outer edge of the hood body completely rotates. This means that a sealing function of the cylinder head cover is taken over exclusively by the hood body in conjunction with the outer cover seal, so that the retaining bridge makes no contribution to the sealing of the enclosed in the assembled state between the cylinder head and the cylinder head cover and the hood body interior.
• the holding bridge which in turn can be fastened separately from the hood body on the cylinder head, can be optimized for additional functions, for example, in order to be able to add additional components to the cylinder head cover.
• the retaining bridge engages over the hood body on an outer side along a hood body section from a first longitudinal side edge of the hood body to an opposite second longitudinal side edge of the hood body. Since the holding bridge thus engages over or covers the hood body in the respective hood body section, forces acting on the holding bridge can be transmitted directly to the cylinder head, without any load being placed on the hood body.
• an inside of the holding bridge facing the hood body is complementary to the outside of the hood body in the hood body section. forms, such that the holding bridge is in the hood body portion in contact with the hood body.
• This can be achieved at the same time that the hood body can be supported on the outside of the holding bridge.
• a pressure stability of the hood body can be improved.
• the holding bridge presses the hood body in the hood body portion against the cylinder head in the mounted state. In this way, with the help of the holding bridge a certain bias for the hood body can be realized, which in particular improves the pressure stability of the hood body.
• the hood body can be made of a plastic material uniformly.
• the hood body may be injection molded in one piece of plastic.
• the holding bridge can also be made of a plastic, but here also a composite material is considered to equip the holding bridge with a higher strength.
• a fiber-reinforced plastic can be used to produce the retaining bridge.
• the holding bridge can also be designed as a metal component.
• the holding bridge is a one-piece injection molded part. A recycling of the cylinder head cover is simplified because the cylinder head and the holding bridge form separate components and are each formed of the same material.
• the holding bridge with respect to the hood body represents a separate component, so that these components can be easily separated from each other for the recycling case.
• the outer cover seal is expediently designed as an axial seal, which thus rests sealingly in the direction of the hood body and the cylinder head, in which the hood body is attached to the cylinder head.
• the holding bridge is expediently shaped so that it is connected in the mounted state outside the outer cover seal with the cylinder head.
• the outer hood seal extends in the hood body portion within the holding bridge.
• the hood body may have a hood opening in the hood body portion, while the holding bridge has a pump console for mounting a fuel pump.
• This pump console can now have within the hood opening a bridge bridge passing through the bridge opening through which a pump drive for driving the fuel pump with a drive cam of the hood body covered camshaft of the cylinder head can cooperate in the assembled state of the cylinder head cover.
• the holding bridge is thus used for mounting a fuel pump, which is drive-coupled in operation with a camshaft of the cylinder head.
• relatively large driving forces are transmitted, which must ultimately be absorbed by the pump console. Since the pump console is located on the holding bridge and this is supported independently of the hood body on the cylinder head, these large driving forces do not affect the hood body.
• a bridge seal for sealing the hood body relative to the holding bridge may be provided, which rotates closed along a hood opening enclosing the inner edge of the hood body.
• the bridge The seal is expediently designed as an axial seal, so that in the direction in which the retaining bridge is placed on the hood body, it rests sealingly on the hood body and on the retaining bridge.
• the pump console may have a channel which encloses the bridge opening and which dips through the hood opening in the enclosed between the hood body and the cylinder head interior. Through this channel, the drive connection between the drive cam and the fuel pump takes place.
• the bridge opening is provided with a round, in particular circular cross-section, which simplifies the production of the pump console and thus the holding bridge.
• the hood opening is expediently provided with an angular, in particular rectangular opening cross-section, which can also be stepped in a longitudinal section. If the retaining bridge bridge bridges the hood body in an arcuate manner or overlaps, a sealing direction oriented in the direction of the mounting direction can result in the region of the hood opening, which can be problematic. Due to the angular and / or stepped design of the hood opening, the bridge seal can be particularly easily laid so that the contacting of the bridge seal by the holding bridge and the hood body is largely parallel to the mounting direction.
• the holding bridge may have bridge attachment points that allow a direct contact and a direct connection with the cylinder head outside the outer edge of the holding body.
• the holding bridge is completely independent of the hood body can be fixed to the cylinder head. In this way, all forces acting on the support bridge can be transmitted without interaction with the hood body on the cylinder head.
• the hood body may have at least one positioning element, which cooperates in a form-fitting manner with a complementary positioning element formed on the retaining bridge for positioning the retaining bridge relative to the hood body. This measure simplifies the assembly of the cylinder head cover.
• the hood body can have at least one injector mounting point for attaching a fuel injector, at least in the hood body section.
• the holding bridge can then have an injector recess for the respective injector mounting point, through which the respective injector mounting point is accessible for mounting the respective fuel injector.
• the attachment of fuel injectors is not affected by the presence of the holding bridge, which simplifies the installation of the cylinder head cover on the cylinder head.
• the respective Injektormontagestelle completely, so be closed circumferentially enclosed by the holding bridge.
• the retaining bridge may have two longitudinal webs which extend along the two longitudinal side edges of the hood body, wherein the retaining bridge has at least two transverse webs extending from the one longitudinal web on the Haubenkorperabrough to the other longitudinal web.
• the longitudinal webs extend suitably in a straight line
• the transverse webs can preferably extend arcuately, in particular in such a way that they are concave on the inner side facing the hood body. Through this arch shape can be, for example, transmitted from the outside to the holding bridge pressure forces particularly favorable from the transverse webs on the longitudinal webs and of these on the cylinder head. If three or more crossbars are present, at least extending a crosspiece between two adjacent Injektornnontagestellen of the aforementioned type.
• the retaining bridge may be supported on the hood body portion via at least one elastomeric body.
• vibrations can be damped.
• a game can be compensated, which can arise for example due to manufacturing tolerances between the hood body and the holding bridge.
• At least one such elastomeric body may be arranged substantially centrally.
• such an elastomeric body may be positioned at one of the transverse webs, approximately centrally between the two longitudinal webs.
• such an elastomeric body can be designed annular.
• the annular elastomeric body may have an H-shaped cross-sectional profile in its circumferential direction.
• the holding bridge may have an engine bearing point for supporting a motor bearing.
• engine mounts are used.
• an engine mount may be realized by means of an engine mount strut which is supported at a first end to the engine bearing location of the support bridge and at a second end to said body shell structure of the vehicle is.
• This engine mount strut can have an elastomer bearing at its first end and / or at its second end in order to be able to achieve the desired elastic support for the piston engine on the bodyshell structure.
• the retaining bridge may have at least one retaining bolt for fastening an attachment.
• Such a design cover can now be attached to the support bridge via such a retaining bolt.
• the cylinder head cover receives another additional function for mounting additional components.
• the holding body may have outside the holding bridge a blow-by-gas outlet, can be removed through the blow-by gas from the enclosed between the cylinder head cover and cylinder head interior, for example, the blow-by gas a Supply fresh air tract of the piston engine.
• the blow-by gas usually carries with it oil, which should remain in the piston engine.
• a ⁇ labscheide noticed is usually arranged in a blow-by-gas feedback, so that ultimately only de-oiled blow-by gas is supplied to the fresh air tract, while the separated oil is returned to the piston engine and remains in the piston engine.
• Particularly useful is an embodiment in which such ⁇ labscheideISS is disposed on an inner side of the hood body facing the cylinder head, for example in the form of a cyclone separator or Labyrinthabscheiders or Impaktors.
• the holding bridge in the moniterten state of the cylinder head cover in the region of the first longitudinal side edge and / or in the region of the second longitudinal side edge of the home ben emotions presses against the cylinder head.
• the holding bridge supports the fixation and sealing of the hood body on the cylinder head.
• Other separate attachment points of the hood body can be relieved and in particular account for at least partially in the region of the holding bridge.
• the holding bridge can form a shoulder in the region of the respective longitudinal side edge, which acts as a hold-down and in particular directly contacts a step which is complementary thereto and is formed on the hood body.
• it may be provided to glue the retaining bridge with the hood body.
• glue In this way, an easily manageable unit of hood body and holding bridge can be formed, which facilitates assembly.
• An inventive piston engine has in the usual way a cylinder head to which a cylinder head cover of the type described above is grown.
• 1 is an isometric plan view of a cylinder head cover
• FIG. 3 shows a cross section of the cylinder head cover in the region of a
• FIG. 4 shows a cross section of the cylinder head cover in the region of a fuel pump
• FIG. 5 is an isometric view of the cylinder head cover with fuel pump mounted thereon and engine mount attached thereto;
• Fig. 6 is an isometric view of the cylinder head cover in an assembled state.
• a cylinder head cover 1 which is intended for mounting on a cylinder head 2, indicated only in FIGS. 3, 4 and 6, of a piston engine 3, in particular of a motor vehicle 4 indicated only in FIG. 6, comprises a hood body 5 and a holding bridge 6.
• the hood body 5 is provided for mounting on the cylinder head 2.
• the holding bridge 6 forms with respect to the hood body 5 a separate component and is also provided for mounting on the cylinder head 2.
• the hood body 5 for one of the holding bridge 6 independent mounting on the cylinder head 2 is provided.
• the hood body 5 hood body side attachment points 7, which allow a separate attachment of the hood body 5 on the cylinder head 2.
• the holding bridge 6, however, has holding bridge-side attachment points 8, which are independent of the attachment points 7 of the hood body 5 and allow a separate fixation of the holding bridge 6 on the cylinder head 2.
• the hood body 5 is equipped with an outer hood seal 9, which seals the hood body 5 relative to the cylinder head 2 in the assembled state.
• the outer hood seal 9 runs along an outer edge 10 of the hood body 5 completely, so that the hood body 5 in connection with the outer hood seal 9 in the assembled state enclosed between the hood body 5 and the cylinder head 2, recognizable in Figures 3 and 4 interior. 1 1 with respect to an environment 12 of the piston engine 3 can seal.
• the holding bridge 6 is arranged on the hood body 5 so that it overlaps the hood body 5 on an outer side 13 facing away from the cylinder head 2 along a hood body portion 14, such that the holding bridge 6 extends from a first longitudinal side edge 15 to an opposite second longitudinal side edge 16.
• the holding bridge 6 is fastened in the mounted state outside the outer cover seal 9 on the cylinder head 2.
• the outer hood seal 9 extends in the hood body portion 14 within the holding bridge. 6
• the hood body 5 expediently has a hood opening 17 in the hood body section 14, while the holding bridge 6 has a pump console 18 in the region of this hood opening 17, with which Help a fuel pump 19 to the support bridge 6 and thus can be attached to the cylinder head cover 1.
• the pump console 18 now has within the hood opening 17 a bridge opening 20 penetrating the holding bridge 6.
• the pump console 18 can have a channel 21 for this purpose, which surrounds the bridge opening 20 in a circumferential direction, for example cylindrical.
• a pump drive 22 which is provided for driving the fuel pump 19, cooperate with a drive cam 23 of a camshaft 24, of the cylinder head cover 1 and Hood body 5 is covered.
• the camshaft 24 is mounted on the cylinder head 2.
• a further camshaft 25 can be seen, which is also mounted on the cylinder head 2 and is covered by the hood body 5.
• the pump drive 22 may be configured, for example, in the manner of a roller tappet, which is operated in a hub-operated manner via the drive cam 23, whereby a linear force transmission between the camshaft 24 and the fuel pump 19 takes place in the stroke direction. The thereby acting on the fuel pump 19 forces are transmitted to the pump bracket 19 and supported by this on the support bridge 6 on the cylinder head 2.
• a bridge seal 26 is expediently provided, which rotates closed along an inner edge 27 of the hood body 5 enclosing the hood opening 17.
• the hood opening 17 is here provided with a rectangular opening cross-section, which is also stepped according to FIG. 4 in cross-section of the cylinder head cover 1.
• the bridge seal 26 follows the course of the inner edge 27 such that between the holding bridge 6 and the bridge seal 26 on the one hand and between the hood body 5 and the bridge seal 26 on the other hand in each case a contact parallel to an assembly direction 28 takes place, in which the hood body 5 and the holding bridge 6 are mounted on the cylinder head 2.
• the retaining bridge-side fastening points 8, which may also be referred to below as bridge fastening points 8, allow an immediate contacting 29 and thus an immediate fixing to the cylinder head 2 outside the outer edge 10 of the hood body 5.
• the holding bridge 6 is bolted to the cylinder head 2 on block.
• the hood mounting points 7 are expediently stiffened with sleeves 31 which can protrude on a cylinder head 2 facing inside of the hood body 5 on the hood body 5 and according to Fig. 3 and 4 with the cylinder head 2 can be bolted to block.
• the cylinder head cover 5 is preferably made of plastic
• the sleeves 31 are preferably made of metal.
• the holding bridge 6 itself is preferably made of metal, so that no such sleeves 31 are required in the region of the bridge attachment points 8.
• the holding bridge 6 presses the hood body 5 against the cylinder head 2 in the monitierter state of the cylinder head cover 1 in the region of the first longitudinal side edge 15 and / or in the region of the second longitudinal side edge 16.
• the holding bridge 6 supports the fixation and sealing of the hood body 5 on the cylinder head 2.
• FIG. 4 shows how the retaining bridge 6 presses the hood body 5 against the cylinder head 2 in the region of the second longitudinal side edge 16.
• the holding bridge 6 in the region of the respective
• Longitudinal side edges 16 form a shoulder 60, which acts as a hold-down and a complementary thereto, formed on the hood body 5 stage 61 contacted directly.
• the hood body 5 can have a plurality of positioning elements 32 which cooperate with counter-positioning elements 33 complementary thereto, formed on the holding bridge 6, in order to position the retaining bridge 6 in a form-fitting manner relative to the hood body 5.
• the hood body 5 has a plurality of injector mounting points 34, of which at least one is arranged in the hood body section 14.
• a total of three injector mounting points 34 are provided, two of which are arranged in the hood body portion 14.
• the third injector mounting point 34 is arranged outside the hood body portion 14 and will be referred to below as 34 '.
• the holding bridge 6 has for the arranged in hood body portion 14 injector mounting points 34 each have a Injektoraussparung 35 which is dimensioned so that through the respective Injektoraussparung 35 through the respective injector mounting point 34 is accessible, such that the associated fuel injector on the hood body 5 can be mounted.
• the respective injector recess 35 is completely enclosed by the holding bridge 6.
• the holding bridge 6 here has two longitudinal webs 37, 38 and a plurality of transverse webs 39, 40, 41.
• the two longitudinal webs 37, 38 each extend one of the two longitudinal side edges 15, 16 of the hood body 5.
• the three transverse webs 39, 40, 41 provided here extend from the one longitudinal web 37 over the Hood body portion 14 to the other longitudinal web 38. While the two longitudinal webs 37, 38 are substantially rectilinear, the three transverse webs 39, 40, 41 extend arcuately.
• Transverse web 40 each extend between two adjacent injector mounting points 34, 34 'therethrough.
• the holding bridge 6 can with its the hood body 5 facing inside
• the holding bridge 6 in the assembled state, the hood body 5 press against the cylinder head 2.
• the embodiment shown is preferred, in which the holding bridge 6 via at least one elastomeric body
• the hood body portion 14 Shown here are two such elastomeric body 43. These may suitably have an annular structure. According to FIG. 3, the respective annular elastomeric body 43 may have an H-shaped profile 44 in the circumferential direction.
• the elastomeric bodies 43 are arranged substantially centrally between the holding bridge 6 and the hood body portion 14. In particular, an immediate contact between the holding bridge 6 and hood body 5 is avoided according to an advantageous embodiment. In this case, the holding bridge 6 is only conditionally used to increase the compressive strength of the hood body. 5
• an engine bearing point 45 is formed in the embodiment shown here, with the aid of a recognizable in Figures 5 and 6 engine mount 46 can be supported on the support bridge 6 and thus on the cylinder head cover 1.
• the engine mount 46 is formed by means of an engine support strut 47, which is supported by a first end 48 on the engine bearing 45 of the support bridge 6 and which is supported by a second end 49 of FIG. 6 on a shell structure 50 of the vehicle 4 ,
• the motor bearing strut 47 has an elastomer bearing 51 or 52 both at its first end 48 and at its second end 49.
• the holding bridge 6 also has a retaining bolt 53, with the aid of which an attachment, not shown here, can be fastened to the retaining bridge 6 and thus to the cylinder head cover 1.
• an attachment is a design cover of the piston engine 3.
• the cylinder head cover 1 shown here has on the hood body 5, outside the holding bridge 6 on a blow-by-gas outlet 54 to which a return line for returning blow-by gas to a fresh air system of the piston motor 3 can be connected.
• the hood body 5 can have further attachment parts 36, 55 on its inner side 42 facing the cylinder head 2, which parts can fulfill different functions.
• one of the attachment parts 36 may be an oil separation device that is located upstream of the blow-by-gas outlet 54 in order to be able to separate off oil from the blow-by gas.
• the other attachment 55 may be e.g. to act a splash guard or an oil guide, for example, to lubricate oil that jets from the camshafts 24, 25 due to the prevailing centrifugal forces, and dissipate in the direction of an oil sump.
• Fig. 3 also an inner hood seal 58 can be seen, with the help of the hood body 5 is sealed within its outer edge 10 relative to the cylinder head cover 2.
• the outer cap seal 9 and the inner cap seal 58 may be integrally molded together and thus represented by a single seal body.
• dowel pins 59 can be seen, with the aid of a direct positioning of the support bridge 6 on the cylinder head 2 can be realized. Accordingly, the dowel pins 59 interact on the one hand with a retaining bridge-side fitting opening 56 and on the other hand with a cylinder-head-side fitting opening 57.
• it may be provided to glue the holding bridge 6 to the hood body 5.
• it may be provided to glue the holding bridge 6 to the hood body 5.
• an easily manageable unit of hood body 5 and holding bridge 6 are formed, which facilitates assembly.

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• 2013
  • 2013-05-06 DE DE102013208231.2A patent/DE102013208231A1/de active Pending
• 2014
  • 2014-04-29 WO PCT/EP2014/058677 patent/WO2014180707A1/de active Application Filing
  • 2014-04-29 US US14/889,438 patent/US9932927B2/en active Active
  • 2014-04-29 EP EP14723385.2A patent/EP2994631B1/de active Active

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