EP2864625B1 - Retainer for mounting a fuel distributor on an internal combustion engine and fuel injection system with such a retainer - Google Patents
Retainer for mounting a fuel distributor on an internal combustion engine and fuel injection system with such a retainer Download PDFInfo
- Publication number
- EP2864625B1 EP2864625B1 EP13718582.3A EP13718582A EP2864625B1 EP 2864625 B1 EP2864625 B1 EP 2864625B1 EP 13718582 A EP13718582 A EP 13718582A EP 2864625 B1 EP2864625 B1 EP 2864625B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- damping element
- damping
- longitudinal axis
- layer
- main body
- 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.)
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Links
- 239000000446 fuel Substances 0.000 title claims description 75
- 238000002347 injection Methods 0.000 title claims description 32
- 239000007924 injection Substances 0.000 title claims description 32
- 238000002485 combustion reaction Methods 0.000 title claims description 19
- 238000013016 damping Methods 0.000 claims description 162
- 239000000463 material Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002146 bilateral effect Effects 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
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- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 241000047428 Halter Species 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
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- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
- F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
- F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/09—Fuel-injection apparatus having means for reducing noise
Definitions
- the invention relates to a holder for fastening a component, in particular a fuel distributor, to a mounting structure, in particular an internal combustion engine.
- the invention relates to the field of fuel injection systems for internal combustion engines of motor vehicles.
- a holder which serves for fastening a fuel distributor strip for direct injection on an internal combustion engine.
- the known holder has damping rings made of an elastomer. Further, cylindrical sleeves are provided, the axial lengths are selected with respect to an axial length of a through hole through which a screw extends. When screwing the screw, the damping rings are acted upon, which ensure additional damping in the region of the through hole.
- the holder according to the invention with the features of claim 1 and the fuel injection system according to the invention with the features of claim 10 have the advantage that an improved vibration damping over the life is guaranteed. Specifically, there is the advantage that a sufficient noise attenuation is ensured even after a long period of operation.
- the fuel distributor can be designed here as a fuel distributor.
- the fuel distributor can serve for distributing the fuel to a plurality of fuel injection valves, in particular high-pressure injection valves.
- the fuel distributor as a common fuel storage for the
- the injection valves are suitably connected to the fuel distributor and then inject the fuel necessary for the combustion process under high pressure into the respective combustion chamber of the internal combustion engine.
- the fuel is compressed by means of a high-pressure pump and conveyed quantity-controlled via a high-pressure line into the fuel distributor.
- the mounting structure may in this case be formed in particular by the internal combustion engine.
- the attachment structure may be a cylinder head of the internal combustion engine.
- the holder according to the invention and the fuel injection system according to the invention can be manufactured and sold independently of such a mounting structure, in particular an internal combustion engine.
- the fuel distributor can be excited during operation to oscillations in the audible frequency range. Above all, this can be done by noise sources in the injectors, which may be part of the fuel injection system.
- the structure-borne sound propagates from the injection valves, for example via cups, the fuel distributor and one or more holders on the mounting structure from where disturbing noises can be emitted, which may even penetrate into the interior of the vehicle.
- the damping element of the holder By the damping element of the holder, however, such disturbing noises can be damped. As a result, in particular a noise nuisance inside the vehicle can be prevented.
- the reduction of disturbing noises that penetrate into the interior of the vehicle is of great practical importance.
- the mounting structure can be advantageously formed by the cylinder head of the internal combustion engine. However, it can also be provided via a connection spacers or other connecting elements.
- the function and durability of the fuel distributor may require some stringent bolting requirements.
- the bolting can have high static forces and dynamic alternating forces.
- the specification may exist that a certain relative movement of the fuel distributor relative to the mounting structure, in particular the cylinder head, must not be exceeded during operation between all operating points.
- it may be necessary for the fuel manifold to sit relatively stiffly on the mounting structure.
- vibration-technical and acoustic damping and decoupling measures at the connection points, in particular Verschraubungsddlingen severely limited in terms of their elasticity.
- Such requirements can be met in an advantageous manner by the holder according to possible embodiments of the invention.
- a vibration control decoupling and damping can be realized, which is compatible with these requirements.
- at least one rigid inner layer of the damping element along the longitudinal axis is positively connected to the fastening sleeve at least one side, that at least one rigid outer layer of the damping element along the longitudinal axis at least on one side positively connected to the body and that between the innermost layer and the outer layer is arranged at least one elastically deformable damping layer.
- the damping element can be configured from exactly one inner layer, the damping layer and exactly one outer layer.
- the inner layer, the damping layer and the outer layer may be connected to one another in an adhesive-bonded manner. In operation, relative movements between the innermost layer and the outer layer then occur in the axial direction.
- the damping layer extends along the longitudinal axis. As a result, the damping layer is to some extent acted upon in this shear direction in this relative movement.
- the claimed cross section of the material of the damping layer is thus very large. As a result, the voltage occurring in the damping layer decreases accordingly. Fatigue of the damping layer is thus avoided.
- the rigid inner layer is formed as a metallic inner layer and that the rigid outer layer as metallic outer layer is formed.
- the damping element can be designed as a damping plate with one or more viscoelastic damping layers.
- the damping element can in this case be bent, for example, to a sleeve shape or partial sleeve shape. A closed in the circumferential direction embodiment of a sleeve-shaped damping element is possible.
- the direction of installation of the damping element can be advantageously specified so that the power transmission takes place mainly within the component and not perpendicular to the rigid layers. In a sense, the transmission of force is mainly parallel to the surface of the damping element.
- the damping element which is configured as a shearing plate with at least one viscoelastic damping layer, a damping of the vibrations of the fuel distributor can thus be achieved at the attachment points of the fuel distributor.
- the structure-borne sound transmission is significantly reduced in the mounting structure. As a result of these two effects, the sound radiation and the sound transmission from the fuel distributor and the mounting structure are reduced. As a result, the vibration load of the affected components can be reduced.
- the mechanical action principle for vibration reduction of the damping element with rigid layers and at least one intermediate viscoelastic damping layer can be described as follows.
- One or more preferably thin viscoelastic damping layers can be laminated in between the preferably metallically configured rigid layers.
- the cushioning layer may be bonded to the rigid layers by vulcanization.
- the damping layer may in this case be advantageously formed from a material based on a rubber.
- the term rubber is to be understood generally and includes synthetic rubber as well as natural rubber.
- the dissipation of structure-borne sound energy leads to a damping of vibration modes of the fuel distributor and thus to a reduction of all body sound components which are transmitted via the damping layer from the fuel distributor into the mounting structure.
- the sound power is reduced by this transmission path. This effect corresponds to a decoupling or insulation of the fuel distributor.
- the properties of the damping layer in particular a thickness or the material properties, can be adapted with regard to a few parameters.
- the frequency contents to be damped and the temperature can serve as parameters.
- Multi-layer damping elements may be advantageous in relation to the particular application. Specifically, an embodiment with three metallic layers and two viscoelastic damping layers is possible, which are stacked alternately.
- a damping element with thin viscoelastic damping layers due to the high material damping allows a substantial reduction of the vibration characteristics and the structure-borne sound transmission, without thereby making the rigid connection too flexible.
- the stiff position of the fuel distributor on the mounting structure can thereby be substantially maintained, so that the relevant functional requirements are met.
- the holder can be designed by the use of the damping layer of the damping element outside the power flow of the fastener to significantly lower forces to be transmitted.
- the configuration of the holder advantageously differs from a conventional embodiment, in which Dämpfringe of an elastic material in the form of washers are acted upon by the tightening force of the screw via the screw head. Because in the solution according to the invention, a configuration is possible in which only the operating loads, but not in addition also the screw clamping force acting on the damping layer of the damping element. Furthermore, it comes to significantly lower set effects, since the damping element is only in operation under load and otherwise almost no forces are transmitted, since no static bias acts.
- a plurality of such holders are provided, which are used at all attachment points of the fuel distributor in order to maximize the effectiveness.
- the base body has a recess on an inner side and that the outer layer of the damping element is inserted into the recess of the base body, that the outer layer of the damping element along the longitudinal axis is positively connected on both sides with the base body.
- the insertion of the damping element in the recess of the body can be done by compressing the damping element to a smaller outer diameter, when the damping element is advantageously designed in the form of a slotted along the longitudinal axis sleeve.
- the damping element can be reliably inserted into the recess of the body.
- the damping element is also secured by the fastener, since the mounted fastener, a reduction of the outer diameter of the damping element is structurally not possible.
- the base body has an indentation with a shoulder on an inner side, that the outer layer of the damping element is inserted into the recess of the base body, that the outer layer of the damping element on the one hand along the longitudinal axis form-fitting manner with the shoulder on the recess the base body cooperates and that the outer layer of the damping element on the other hand cooperates form-fitting manner along the longitudinal axis with a clamping sleeve which is pressed into the recess of the base body.
- the damping element is designed as a sleeve-shaped damping element. To insert the damping element, the outer diameter of the damping element in this case need not be reduced.
- the damping element can be inserted with a one-sided open configuration of the recess of the body with or without play. Subsequently, a captive can be formed by the clamping sleeve, which can be pressed into the recess of the body. In the assembled state a reliable fixation of the damping element and in addition a two-sided form fit for the damping element is thus ensured over the life.
- the fastening sleeve has on its outer side a recess with at least one shoulder and that the inner layer of the damping element is inserted into the recess of the fastening sleeve, that the inner layer of the damping element along the longitudinal axis cooperates form-fitting manner with the shoulder of the fastening sleeve.
- the inner layer of the damping element on the one hand along the longitudinal axis positively cooperates with the shoulder of the fastening sleeve and on the other hand is at least indirectly supported on a head of the fastener. As a result, a bilateral fixation of the inner layer of the damping element is ensured.
- Fig. 1 shows a fuel injection system 1 with a fuel distributor 2 and a plurality of holders 3, 4, 5, which for fastening the fuel distributor 2 to a mounting structure 23 (FIGS. Fig. 2 ), in an excerpt, schematic sectional view according to a first embodiment.
- the fuel injection system 1 can be used in particular for high-pressure injection in mixture-compression, spark-ignited internal combustion engines.
- the mounting structure 23, to which the fuel distributor 2 is fastened via the holders 3, 4, 5, can then be the internal combustion engine, in particular a cylinder head of the internal combustion engine.
- the fuel distributor 2 has cups 6, 7, 8, 9.
- the fuel injection system 1 injectors 10, 11, 12, 13, which are attached to the cups 6 to 9 of the fuel distributor 2.
- the fuel distributor 2 is designed in this embodiment as a fuel distributor strip with a manifold 14.
- the holders 3 to 5 can also serve for fastening other components to a mounting structure 23.
- Fig. 2 shows an excerpted section through the in Fig. 1 illustrated fuel injection system 1 according to the first embodiment along the designated II section line.
- a section through the holder 3 is shown.
- the design of the holder 4, 5 of the fuel injection system 1 corresponds to the embodiment of the holder 3.
- the holder 3 has a base body 20 which is connected to the manifold 14 of the fuel distributor 2.
- the fastening element 21 can be screwed or otherwise connected to the mounting structure 23, in particular the cylinder head 23, along an axis 22.
- the main body 20 has a through hole 24.
- the axis 22 is at the same time the axis (longitudinal axis) 22 of the through hole 24.
- the fastening element 21 extends for attaching the base body 20 to the mounting structure 23 along the longitudinal axis 22 of the through hole 24 of the base body 20 through the through hole 24 and a disposed in the through hole 24
- a fastening sleeve 26 is provided, which is aligned along the longitudinal axis 22 and through which the fastening element 21 extends. By screwing the fastening element 21 into the mounting structure 23, the fastening sleeve 26 is clamped and fixed between a head 27 and an upper side 28 of the mounting structure 23.
- the mechanical connection between the head 27 and the main body 20 of the holder 3 comes about the mounting sleeve 26 and the damping element 25.
- the attachment of the base body 20 to the mounting structure 23 thus takes place, inter alia, via the damping element 25.
- Vibrations or the like occurring during operation act mainly along the longitudinal axis 22.
- These vibrations along the longitudinal axis 22 can be damped by the damping element 25 in an advantageous manner , In particular, a vibration propagation from the manifold 14 of the fuel distributor 2 to the mounting structure 23 is effectively damped by the damping element 25.
- Fig. 3 shows a schematic section through the in Fig. 2 shown damping element 25 of the holder 3 along the designated III cutting line.
- the damping element 25 is configured in the form of a slotted sleeve 25 along the longitudinal axis 22.
- the damping element 25 has an outer diameter 30.
- the damping element 25 has mutually facing side surfaces 31, 32, between which a gap 33 is provided. The damping element 25 can be compressed so that the side surfaces 31, 32 approach each other and optionally abut each other. As a result, the outer diameter 30 of the damping element 25 decreases.
- the main body 20 has an indentation 35 on an inner side 34.
- the recess 35 of the base body 20 extends circumferentially about 360 ° with respect to the longitudinal axis 22.
- the damping element 25 has an inner layer 36, an outer layer 37 and a damping layer 38 arranged between the inner layer 36 and the outer layer 37.
- the outer layer 37 of the damping element 25 is inserted into the recess 35 of the base body 20.
- the damping element 25 is compressed, so that the outer diameter 30 is reduced.
- the damping element 25 is introduced into the through hole 24 of the base body 20.
- the damping element 25 is relieved again, so that its outer diameter 30 increases again.
- the outer layer 37 of the damping element 25 is then connected on both sides positively to the base body 20.
- the fastening sleeve 26 can be introduced into the through hole 24.
- the fastening sleeve 26 has a recess 40 on its outer side 39.
- the mounting sleeve 26 on its outer side 39 has a recess 40 with a shoulder 41.
- the inner layer 36 of the damping element 25 is inserted in the mounted state in the recess 40 of the mounting sleeve 26, that the inner layer 36 of the damping element 25 along the longitudinal axis 22 positively cooperates with the shoulder 41 of the mounting sleeve 26.
- outer layer 37 is the Damping element 25 along the longitudinal axis 22 on both sides or two-sided positively connected to the base body 20.
- the damping element 25 surrounds the outer side 39 of the mounting sleeve 26 partially in the mounted state, since the damping element 25 is designed slotted, as shown in the Fig. 3 is illustrated by the gap 33.
- the inner layer 36 of the damping element 25 is designed as a rigid inner layer 36.
- the inner layer 36 may be formed in particular as a metallic inner layer 36.
- the outer layer 37 is designed as a rigid outer layer 37.
- the outer layer 37 may be formed in particular as a metallic outer layer 37.
- the damping layer 38 is on the one hand materially connected to the inner layer 36 and on the other hand materially connected to the outer layer 37. Vibrations along the longitudinal axis 22 thus have a shearing effect on the damping layer 38.
- Vibrations along the longitudinal axis 22 thus have a shearing effect on the damping layer 38.
- a large cross-section of the damping layer 38 is available, over which the forces occurring are distributed.
- the stresses occurring in the damping layer 38 are correspondingly low.
- the damping element 25 can thus be made resilient to use it in the recess 35 of the base body 20. Due to the resilient property, the damping element 25 increases during assembly again its outer diameter 30, so that it ensures a positive connection with the base body 20 in the end position.
- the outer diameter 30 of the damping element 25 may in this case be equal to an inner diameter 42 of the recess 35 of the base body 20.
- Fig. 4 shows the in Fig. 2 illustrated fuel injection system 1 in an excerpted sectional view according to a second embodiment.
- the depression 35 of the base body 20 is initially designed to be open towards the upper side 28 of the mounting structure 23.
- the damping element 25 can be inserted directly into the base body 20 by this is inserted along the longitudinal axis 22 in the base body 20.
- a certain game can be provided.
- the outer diameter 30 of the damping element 25 may be smaller than the inner diameter 42 of the recess 35 of the base body 20.
- damping element 25 can thus be designed to be closed when viewed in the circumferential direction. As a result, the stability of the damping element 25 can be improved. In particular, with the same space required, the damping layer 38 can be increased in its axial shear surface and thus also in its volume.
- the base body 20 on its inner side 34, the recess 35 with a shoulder 45, wherein the outer layer 37 of the damping element 25 is inserted into the recess 35 of the base body 20.
- the outer layer 37 of the damping element 25 thus acts on the one hand along the longitudinal axis 22 positively with the shoulder 45 on the recess 35 of the body 20 together.
- a clamping sleeve 46 is pressed into the recess 35 of the base body 20.
- the outer layer 37 of the damping element 25 on the other hand along the longitudinal axis 22 positively cooperates with the clamping sleeve 46, which is pressed into the base body 20.
- a bilateral positive connection between the outer layer 37 and the base body 20 is formed.
- the inner layer 36 of the damping element 25 cooperates on the one hand with the shoulder 41 of the recess 40 of the mounting sleeve 26 and on the other hand with the top 28 of the mounting structure 23 together.
- a bilateral fixation of the inner layer 36 is given along the longitudinal axis 22.
- Fig. 5 shows the in Fig. 2 illustrated fuel injection system 1 in an excerpted sectional view according to a third embodiment.
- the recess 40 of the mounting sleeve 26 has a shoulder 47.
- a support ring 48 is disposed between the head 27 of the fastener 21 and the mounting sleeve.
- the support ring 48 is designed so large that it is also disposed between the inner layer 36 of the damping element 25 and the head 27.
- the head 27 of the fastening element 21 acts on the fastening sleeve 26 against the upper side 28 of the mounting structure 23.
- the inner layer 36 is supported on the head 27 by means of the support ring 48.
- the inner layer 36 of the damping element 25 is fixed on both sides, namely on the one hand by the shoulder 47 of the mounting sleeve 26 and on the other hand via the support ring 48 through the head 27 of the fastener 21st
- the damping element 25 may be configured in the form of a slotted sleeves in this embodiment, as it is based on the Fig. 3 is described. In a modified embodiment, however, the damping element 25 may also be designed sleeve-shaped, for example by a clamping sleeve 46 is used to close a recess 35 open on one side of the base body 20, as it is based on Fig. 4 is described.
- the damping element 25 can also be materially connected to the fastening sleeve 26.
- the inner layer 36 of the damping element 25 can be omitted and the damping layer 38 can be connected directly to the outer side 39 of the mounting sleeve 26.
- the outer side 39 of the fastening sleeve 26 can also be designed in the form of a cylinder jacket.
- the relatively stiff connection of the fuel distributor 2 can be maintained despite the damping element 25.
- the elasticity of the attachment of the fuel distributor 2 may increase only slightly.
- the structure-borne sound excitation of the internal combustion engine on the fuel distributor 2 can be reduced by the damping element 25.
- the low vibration load of the fuel distributor 2 is also advantageous.
- the directly emitted by the fuel distributor 2 noise components can be reduced by the increased component damping due to the damping element 25.
- the airborne sound radiation excited by structure-borne noise also falls from the mounting structure 23.
- the transmission of structure-borne sound by other components to a body or the like is reduced. In all cases, the noise is mitigated.
- the space required by the damping element 25 is very small, resulting in no significant additional space for the holder 3, 4, 5 results. This is due to the fact that the damping element 25 in sleeve or sub-sleeve shape can optimally use the already required clamping length of the fastening element 21 to compensate for relaxation in the fastening composite, in particular erverbund.
- the decoupling can be used on a directly connected fuel distributor 2, in which the injection valves 10 to 13 are fixed, for example, via O-rings biased in the cups 6 to 9. In the direction of the injection valves 10 to 13, the injection valves 10 to 13 are then not at a given by the fuel distributor 2 stop. Instead, the injection valves 10 to 13 are pressed by the force resulting from the rail pressure against the mounting structure 23, in particular the cylinder head 23, and thereby fixed.
- the decoupling can be used on a line-connected fuel distributor 2 or on an injector-decoupled fuel distributor 2, in which the injection valves 10 to 13 are either positively connected via a line to the fuel distributor 2 or alternatively positively connected to the fuel distributor 2, for example via clips , Locking lugs or a screw connection. In this case, only operating loads from the combustion chamber pressure and from the vibration load of the internal combustion engine are absorbed by the damping elements 25.
- the stiffness of the holders 3 to 5 can be optimally adapted to the acoustic optimization needs when using the damping elements 25 in sleeve or sub-sleeve shape, in particular a relatively soft configuration possible is.
- the operating load is distributed over large areas.
- An overload of the material, in particular elastomer material, of the damping element 25 for the damping layer 38 can thus be effectively avoided.
- the damping element 25 is characterized by a simple manufacturability and thus by low production costs. Specifically, a flat composite sheet are cut and bent to produce sleeve-shaped or part-sleeve-shaped damping elements 25.
- the damping layer 38 can in this case be produced by laminating or laminating. Another manufacturing possibility is that pipe sections of different diameters are connected by means of laminated elastomer layers and thus closed sleeve-shaped damping elements 25 are produced.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Description
Die Erfindung betrifft einen Halter zur Befestigung einer Komponente, insbesondere eines Brennstoffverteilers, an einer Anbaustruktur, insbesondere einer Brennkraftmaschine.The invention relates to a holder for fastening a component, in particular a fuel distributor, to a mounting structure, in particular an internal combustion engine.
Ferner betrifft die Erfindung das Gebiet der Brennstoffeinspritzanlagen für Brennkraftmaschinen von Kraftfahrzeugen.Furthermore, the invention relates to the field of fuel injection systems for internal combustion engines of motor vehicles.
Aus der
Der aus der
Der erfindungsgemäße Halter mit den Merkmalen des Anspruchs 1 und die erfindungsgemäße Brennstoffeinspritzanlage mit den Merkmalen des Anspruchs 10 haben den Vorteil, dass eine verbesserte Schwingungsdämpfung über die Lebensdauer gewährleistet ist. Speziell ergibt sich der Vorteil, dass eine ausreichende Geräuschdämpfung auch nach einer hohen Betriebsdauer gewährleistet ist.The holder according to the invention with the features of
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen des im Anspruch 1 angegebenen Halters und der im Anspruch 10 angegebenen Brennstoffeinspritzanlage möglich.The measures listed in the dependent claims advantageous developments of the holder specified in
Speziell eignen sich der Halter sowie die Brennstoffeinspritzanlage mit dem Halter für Brennkraftmaschinen zur Benzindirekteinspritzung. Der Brennstoffverteiler kann hierbei als Brennstoffverteilerleiste ausgestaltet sein. Der Brennstoffverteiler kann zum einen zur Verteilung des Brennstoffs auf mehrere Brennstoffeinspritzventile, insbesondere Hochdruckeinspritzventile, dienen. Zum anderen kann der Brennstoffverteiler als gemeinsamer Brennstoffspeicher für dieEspecially suitable are the holder and the fuel injection system with the holder for internal combustion engines for gasoline direct injection. The fuel distributor can be designed here as a fuel distributor. The fuel distributor can serve for distributing the fuel to a plurality of fuel injection valves, in particular high-pressure injection valves. On the other hand, the fuel distributor as a common fuel storage for the
Hochdruckeinspritzventile dienen. Die Einspritzventile sind auf geeignete Weise mit dem Brennstoffverteiler verbunden und spritzen den zum Verbrennungsvorgang notwendigen Brennstoff dann unter hohem Druck in den jeweiligen Verbernnungsraum der Brennkraftmaschine ein. Der Brennstoff wird hierfür über eine Hochdruckpumpe verdichtet und mengengesteuert über eine Hochdruckleitung in den Brennstoffverteiler gefördert. Über den Halter wird der Brennstoffverteiler an der Anbaustruktur befestigt. Die Anbaustruktur kann hierbei insbesondere durch die Brennkraftmaschine gebildet sein. Speziell kann es sich bei der Anbaustruktur um einen Zylinderkopf der Brennkraftmaschine handeln. Der erfindungsgemäße Halter und die erfindungsgemäße Brennstoffeinspritzanlage können jedoch unabhängig von solch einer Anbaustruktur, insbesondere einer Brennkraftmaschine, hergestellt und vertrieben werden.Serve high pressure injectors. The injection valves are suitably connected to the fuel distributor and then inject the fuel necessary for the combustion process under high pressure into the respective combustion chamber of the internal combustion engine. For this purpose, the fuel is compressed by means of a high-pressure pump and conveyed quantity-controlled via a high-pressure line into the fuel distributor. About the holder of the fuel distributor is attached to the mounting structure. The mounting structure may in this case be formed in particular by the internal combustion engine. Specifically, the attachment structure may be a cylinder head of the internal combustion engine. However, the holder according to the invention and the fuel injection system according to the invention can be manufactured and sold independently of such a mounting structure, in particular an internal combustion engine.
Der Brennstoffverteiler kann im Betrieb zu Schwingungen im hörbaren Frequenzbereich angeregt werden. Vor allem kann dies durch Geräuschquellen in den Einspritzventilen, die Bestandteil der Brennstoffeinspritzanlage sein können, geschehen. Der Körperschall breitet sich hierbei von den Einspritzventilen beispielsweise über Tassen, den Brennstoffverteiler und einen oder mehrere Halter auf die Anbaustruktur aus, von wo störende Geräusche abgestrahlt werden können, die unter Umständen sogar bis ins Innere des Fahrzeugs dringen. Durch das Dämpfungselement des Halters können solche störenden Geräusche jedoch gedämpft werden. Dadurch kann insbesondere eine Geräuschbelästigung im Inneren des Fahrzeugs verhindert werden. Speziell die Reduzierung von störenden Geräuschen, die ins Innere des Fahrzeugs dringen, ist von großer praktischer Bedeutung.The fuel distributor can be excited during operation to oscillations in the audible frequency range. Above all, this can be done by noise sources in the injectors, which may be part of the fuel injection system. The structure-borne sound propagates from the injection valves, for example via cups, the fuel distributor and one or more holders on the mounting structure from where disturbing noises can be emitted, which may even penetrate into the interior of the vehicle. By the damping element of the holder, however, such disturbing noises can be damped. As a result, in particular a noise nuisance inside the vehicle can be prevented. In particular, the reduction of disturbing noises that penetrate into the interior of the vehicle is of great practical importance.
Die Anbaustruktur kann in vorteilhafter Weise durch den Zylinderkopf der Brennkraftmaschine gebildet sein. Es kann jedoch auch eine Anbindung über Distanzhülsen oder über weitere Verbindungselemente vorgesehen sein.The mounting structure can be advantageously formed by the cylinder head of the internal combustion engine. However, it can also be provided via a connection spacers or other connecting elements.
Die Funktion und Betriebsfestigkeit des Brennstoffverteilers kann einige strikte Anforderungen an die Verschraubung bedingen. So können beispielsweise auf die Verschraubung hohe statische Kräfte und dynamische Wechselkräfte einwirken. Außerdem kann die Vorgabe bestehen, dass eine bestimmte Relativbewegung des Brennstoffverteilers gegenüber der Anbaustruktur, insbesondere dem Zylinderkopf, im Betrieb zwischen allen Betriebspunkten nicht überschritten werden darf. Speziell wegen solcher Funktions- und Festigkeitsanforderungen kann es erforderlich sein, dass der Brennstoffverteiler relativ steif auf der Anbaustruktur sitzt. Dadurch sind schwingungstechnische und akustische Dämpfungs- und Entkopplungsmaßnahmen an den Verbindungspunkten, insbesondere Verschraubungspunkten, hinsichtlich ihrer Elastizität stark eingeschränkt. Solche Anforderungen können in vorteilhafter Weise durch den Halter entsprechend möglicher Ausgestaltungen der Erfindung erfüllt werden. Speziell ist eine schwingungstechnische Entkopplung und Dämpfung realisierbar, die mit diesen Anforderungen verträglich ist. Erfindungsgemäß ist es, dass zumindest eine starre innenliegende Schicht des Dämpfungselements entlang der Längsachse wenigstens einseitig formschlüssig mit der Befestigungshülse verbunden ist, dass zumindest eine starre außenliegende Schicht des Dämpfungselements entlang der Längsachse wenigstens einseitig formschlüssig mit dem Grundkörper verbunden ist und dass zwischen der innliegenden Schicht und der außenliegenden Schicht zumindest eine elastisch verformbare Dämpfungsschicht angeordnet ist. Speziell kann das Dämpfungselement aus genau einer innenliegenden Schicht, der Dämpfungsschicht und genau einer außenliegenden Schicht ausgestaltet sein. Die innenliegende Schicht, die Dämpfungsschicht und die außenliegende Schicht können in vorteilhafter Weise stoffschlüssig miteinander verbunden sein. Im Betrieb kommt es dann in axialer Richtung zu Relativbewegungen zwischen der innliegenden Schicht und der außenliegenden Schicht. Die Dämpfungsschicht erstreckt sich hierbei entlang der Längsachse. Dadurch wird die Dämpfungsschicht bei dieser Relativbewegung gewissermaßen in Scherrichtung beaufschlagt. Der beanspruchte Querschnitt des Materials der Dämpfungsschicht ist somit sehr groß. Dadurch verringert sich entsprechend die in der Dämpfungsschicht auftretende Spannung. Eine Ermüdung der Dämpfungsschicht wird somit vermieden.The function and durability of the fuel distributor may require some stringent bolting requirements. For example, the bolting can have high static forces and dynamic alternating forces. In addition, the specification may exist that a certain relative movement of the fuel distributor relative to the mounting structure, in particular the cylinder head, must not be exceeded during operation between all operating points. Specifically, because of such functional and strength requirements, it may be necessary for the fuel manifold to sit relatively stiffly on the mounting structure. As a result, vibration-technical and acoustic damping and decoupling measures at the connection points, in particular Verschraubungspunkten, severely limited in terms of their elasticity. Such requirements can be met in an advantageous manner by the holder according to possible embodiments of the invention. Specifically, a vibration control decoupling and damping can be realized, which is compatible with these requirements. According to the invention, at least one rigid inner layer of the damping element along the longitudinal axis is positively connected to the fastening sleeve at least one side, that at least one rigid outer layer of the damping element along the longitudinal axis at least on one side positively connected to the body and that between the innermost layer and the outer layer is arranged at least one elastically deformable damping layer. Specifically, the damping element can be configured from exactly one inner layer, the damping layer and exactly one outer layer. The inner layer, the damping layer and the outer layer may be connected to one another in an adhesive-bonded manner. In operation, relative movements between the innermost layer and the outer layer then occur in the axial direction. The damping layer extends along the longitudinal axis. As a result, the damping layer is to some extent acted upon in this shear direction in this relative movement. The claimed cross section of the material of the damping layer is thus very large. As a result, the voltage occurring in the damping layer decreases accordingly. Fatigue of the damping layer is thus avoided.
Ferner ist es vorteilhaft, dass die starre innenliegende Schicht als metallische innenliegende Schicht ausgebildet ist und dass die starre außenliegende Schicht als metallische außenliegende Schicht ausgebildet ist. Speziell kann das Dämpfungselement als Dämpfungsblech mit ein oder mehreren viskoelastischen Dämpfungsschichten ausgestaltet sein. Das Dämpfungselement kann hierbei beispielsweise zu einer Hülsenform oder Teilhülsenform gebogen werden. Auch eine in Umfangsrichtung geschlossene Ausgestaltung eines hülsenförmigen Dämpfungselements ist möglich. Somit kann die Verbaurichtung des Dämpfungselements in vorteilhafter Weise so vorgegeben sein, dass die Kraftübertragung hauptsächlich innerhalb des Bauteils und nicht senkrecht zu den starren Schichten erfolgt. Gewissermaßen erfolgt die Kraftübertragung hauptsächlich parallel zur Oberfläche des Dämpfungselements.Furthermore, it is advantageous that the rigid inner layer is formed as a metallic inner layer and that the rigid outer layer as metallic outer layer is formed. Specifically, the damping element can be designed as a damping plate with one or more viscoelastic damping layers. The damping element can in this case be bent, for example, to a sleeve shape or partial sleeve shape. A closed in the circumferential direction embodiment of a sleeve-shaped damping element is possible. Thus, the direction of installation of the damping element can be advantageously specified so that the power transmission takes place mainly within the component and not perpendicular to the rigid layers. In a sense, the transmission of force is mainly parallel to the surface of the damping element.
Durch den Einsatz des Dämpfungselements, das als Scherblech mit zumindest einer viskoelastischen Dämpfungsschicht ausgestaltet ist, kann somit an den Befestigungspunkten des Brennstoffverteilers eine Bedämpfung der Schwingungen des Brennstoffverteilers erzielt werden. Außerdem wird die Körperschallübertragung in die Anbaustruktur deutlich reduziert. Infolge dieser beiden Wirkungen werden die Schallabstrahlung und die Schallweiterleitung vom Brennstoffverteiler und der Anbaustruktur reduziert. Dadurch kann auch die Vibrationsbelastung der betroffenen Komponenten reduziert werden.Through the use of the damping element, which is configured as a shearing plate with at least one viscoelastic damping layer, a damping of the vibrations of the fuel distributor can thus be achieved at the attachment points of the fuel distributor. In addition, the structure-borne sound transmission is significantly reduced in the mounting structure. As a result of these two effects, the sound radiation and the sound transmission from the fuel distributor and the mounting structure are reduced. As a result, the vibration load of the affected components can be reduced.
Das mechanische Wirkprinzip zur Schwingungsreduzierung des Dämpfungselements mit starren Schichten und zumindest einer dazwischenliegenden viskoelastischen Dämpfungsschicht kann folgendermaßen beschrieben werden. Zwischen den vorzugsweise metallisch ausgestalteten starren Schichten können ein oder mehrere vorzugsweise dünne viskoelastische Dämpfungsschichten einlaminiert werden. Speziell kann die Dämpfungsschicht hierbei durch Vulkanisieren mit den starren Schichten verbunden sein. Die Dämpfungsschicht kann hierbei in vorteilhafter Weise aus einem auf einem Gummi basierenden Werkstoff gebildet sein. Der Begriff des Gummis ist hierbei allgemein zu verstehen und umfasst neben einem Naturkautschuk auch synthetische Gummiwerkstoffe. Bei einer Relativbewegung der beiden starren Schichten wird die dazwischen liegende viskoelastische Dämpfungsschicht dynamisch stark auf Scherung beansprucht. Dadurch wird ein hoher Anteil an Vibrationsenergie durch Materialdämpfung dissipiert.The mechanical action principle for vibration reduction of the damping element with rigid layers and at least one intermediate viscoelastic damping layer can be described as follows. One or more preferably thin viscoelastic damping layers can be laminated in between the preferably metallically configured rigid layers. Specifically, the cushioning layer may be bonded to the rigid layers by vulcanization. The damping layer may in this case be advantageously formed from a material based on a rubber. The term rubber is to be understood generally and includes synthetic rubber as well as natural rubber. In a relative movement of the two rigid layers, the intermediate viscoelastic damping layer is dynamically stressed to shear. As a result, a high proportion of vibration energy is dissipated by material damping.
Die Dissipation von Körperschallenergie führt in jedem Fall zu einer Bedämpfung von Schwingformen des Brennstoffverteilers und somit zu einer Reduzierung aller Körperschallanteile, die über die Dämpfungsschicht vom Brennstoffverteiler in die Anbaustruktur übertragen werden. Somit wird die Schallleistung durch diesen Übertragungspfad gemindert. Diese Wirkung entspricht einer Entkopplung beziehungsweise Isolation des Brennstoffverteilers.In any case, the dissipation of structure-borne sound energy leads to a damping of vibration modes of the fuel distributor and thus to a reduction of all body sound components which are transmitted via the damping layer from the fuel distributor into the mounting structure. Thus, the sound power is reduced by this transmission path. This effect corresponds to a decoupling or insulation of the fuel distributor.
Die Eigenschaften der Dämpfungsschicht, insbesondere eine Dicke oder die Materialeigenschaften, können hinsichtlich einiger Parameter angepasst werden. Als Parameter können insbesondere die zu bedämpfenden Frequenzinhalte und die Temperatur dienen. Mehrlagige Dämpfungselemente können hierbei in Bezug auf den jeweiligen Anwendungsfall vorteilhaft sein. Speziell ist eine Ausgestaltung mit drei metallischen Schichten und zwei viskoelastischen Dämpfungsschichten möglich, die abwechselnd aufeinander geschichtet sind.The properties of the damping layer, in particular a thickness or the material properties, can be adapted with regard to a few parameters. In particular, the frequency contents to be damped and the temperature can serve as parameters. Multi-layer damping elements may be advantageous in relation to the particular application. Specifically, an embodiment with three metallic layers and two viscoelastic damping layers is possible, which are stacked alternately.
In vorteilhafter Weise ermöglicht speziell ein Dämpfungselement mit dünnen viskoelastischen Dämpfungsschichten aufgrund der hohen Materialdämpfung eine wesentliche Reduzierung der Schwingungseigenschaften und der Körperschalltransmission, ohne dass dadurch die steife Anbindung zu flexibel gemacht wird. Die steife Lage des Brennstoffverteilers auf der Anbaustruktur kann dadurch im Wesentlichen beibehalten werden, so dass die diesbezüglichen Funktionsanforderungen erfüllt sind.Advantageously, especially a damping element with thin viscoelastic damping layers due to the high material damping allows a substantial reduction of the vibration characteristics and the structure-borne sound transmission, without thereby making the rigid connection too flexible. The stiff position of the fuel distributor on the mounting structure can thereby be substantially maintained, so that the relevant functional requirements are met.
Ferner kann der Halter durch den Einsatz der Dämpfungsschicht des Dämpfungselements außerhalb des Kraftflusses des Befestigungselements auf deutlich geringere zu übertragende Kräfte ausgelegt werden. Somit unterscheidet sich die Ausgestaltung des Halters in vorteilhafter Weise von einer herkömmlichen Ausgestaltung, bei der Dämpfringe aus einem elastischen Werkstoff in Form von Unterlegscheiben von der Anzugkraft des Schraubelements über den Schraubenkopf beaufschlagt sind. Denn bei der erfindungsgemäßen Lösung ist eine Ausgestaltung möglich, bei der nur die Betriebslasten, nicht jedoch zusätzlich auch die Schraubenklemmkraft auf die Dämpfungsschicht des Dämpfungselements einwirken. Des weiteren kommt es zu deutlich geringeren Setzeffekten, da das Dämpfungselement nur im Betrieb unter Last steht und ansonsten nahezu keine Kräfte übertragen werden, da keine statische Vorspannung wirkt.Further, the holder can be designed by the use of the damping layer of the damping element outside the power flow of the fastener to significantly lower forces to be transmitted. Thus, the configuration of the holder advantageously differs from a conventional embodiment, in which Dämpfringe of an elastic material in the form of washers are acted upon by the tightening force of the screw via the screw head. Because in the solution according to the invention, a configuration is possible in which only the operating loads, but not in addition also the screw clamping force acting on the damping layer of the damping element. Furthermore, it comes to significantly lower set effects, since the damping element is only in operation under load and otherwise almost no forces are transmitted, since no static bias acts.
In vorteilhafter Weise sind mehrere solche Halter vorgesehen, die an allen Befestigungspunkten des Brennstoffverteilers zum Einsatz kommen, um die Wirksamkeit zu maximieren.Advantageously, a plurality of such holders are provided, which are used at all attachment points of the fuel distributor in order to maximize the effectiveness.
Vorteilhaft ist es, dass der Grundkörper an einer Innenseite eine Vertiefung aufweist und dass die außenliegende Schicht des Dämpfungselements so in die Vertiefung des Grundkörpers eingesetzt ist, dass die außenliegende Schicht des Dämpfungselements entlang der Längsachse beidseitig formschlüssig mit dem Grundkörper verbunden ist. Somit ist eine ortsfeste Fixierung der außenliegenden Schicht in Bezug auf den Grundkörper möglich. Das Einsetzen des Dämpfungselements in die Vertiefung des Grundkörpers kann durch Zusammendrücken des Dämpfungselements auf einen geringeren Außendurchmesser erfolgen, wenn das Dämpfungselement in vorteilhafter Weise in Form einer entlang zu der Längsachse geschlitzten Hülse ausgestaltet ist. Durch die beim Zusammendrücken aufgebaute Vorspannung des Dämpfungselements nimmt dieses anschließend wieder seine ursprüngliche Form an. Dadurch kann das Dämpfungselement zuverlässig in die Vertiefung des Grundkörpers eingesetzt werden. Im montierten Zustand ist das Dämpfungselement außerdem durch das Befestigungselement gesichert, da beim montierten Befestigungselement eine Reduzierung des Außendurchmessers des Dämpfungselements konstruktiv nicht möglich ist.It is advantageous that the base body has a recess on an inner side and that the outer layer of the damping element is inserted into the recess of the base body, that the outer layer of the damping element along the longitudinal axis is positively connected on both sides with the base body. Thus, a stationary fixation of the outer layer with respect to the main body possible. The insertion of the damping element in the recess of the body can be done by compressing the damping element to a smaller outer diameter, when the damping element is advantageously designed in the form of a slotted along the longitudinal axis sleeve. As a result of the prestressing of the damping element, which is built up during compression, the latter then returns to its original shape. Thereby, the damping element can be reliably inserted into the recess of the body. In the assembled state, the damping element is also secured by the fastener, since the mounted fastener, a reduction of the outer diameter of the damping element is structurally not possible.
Vorteilhaft ist es allerdings auch, dass der Grundkörper an einer Innenseite eine Vertiefung mit einem Absatz aufweist, dass die außenliegende Schicht des Dämpfungselements in die Vertiefung des Grundkörpers eingefügt ist, dass die außenliegende Schicht des Dämpfungselements einerseits entlang der Längsachse formschlüssig mit dem Absatz an der Vertiefung des Grundkörpers zusammenwirkt und dass die außenliegende Schicht des Dämpfungselements andererseits entlang der Längsachse formschlüssig mit einer Klemmhülse zusammenwirkt, die in die Vertiefung des Grundkörpers eingepresst ist. Speziell bei dieser Ausgestaltung ist es vorteilhaft, dass das Dämpfungselement als hülsenförmiges Dämpfungselement ausgestaltet ist. Zum Einfügen des Dämpfungselements muss der Außendurchmesser des Dämpfungselements in diesem Fall nicht verringert werden. Denn das Dämpfungselement kann bei einer einseitig offenen Ausgestaltung der Vertiefung des Grundkörpers mit oder ohne Spiel eingefügt werden. Anschließend kann durch die Klemmhülse, die in die Vertiefung des Grundkörpers eingepresst werden kann, eine Verliersicherung gebildet werden. Im montierten Zustand ist somit über die Lebensdauer eine zuverlässige Fixierung des Dämpfungselements und zusätzlich ein beidseitiger Formschluss für das Dämpfungselement gewährleistet ist.However, it is also advantageous that the base body has an indentation with a shoulder on an inner side, that the outer layer of the damping element is inserted into the recess of the base body, that the outer layer of the damping element on the one hand along the longitudinal axis form-fitting manner with the shoulder on the recess the base body cooperates and that the outer layer of the damping element on the other hand cooperates form-fitting manner along the longitudinal axis with a clamping sleeve which is pressed into the recess of the base body. Especially in this embodiment, it is advantageous that the damping element is designed as a sleeve-shaped damping element. To insert the damping element, the outer diameter of the damping element in this case need not be reduced. Because the damping element can be inserted with a one-sided open configuration of the recess of the body with or without play. Subsequently, a captive can be formed by the clamping sleeve, which can be pressed into the recess of the body. In the assembled state a reliable fixation of the damping element and in addition a two-sided form fit for the damping element is thus ensured over the life.
Vorteilhaft ist es, dass die Befestigungshülse an ihrer Außenseite eine Vertiefung mit zumindest einem Absatz aufweist und dass die innenliegende Schicht des Dämpfungselements so in die Vertiefung der Befestigungshülse eingefügt ist, dass die innenliegende Schicht des Dämpfungselements entlang der Längsachse formschlüssig mit dem Absatz der Befestigungshülse zusammenwirkt. Hierbei ist es ferner vorteilhaft, dass die innenliegende Schicht des Dämpfungselements einerseits entlang der Längsachse formschlüssig mit dem Absatz der Befestigungshülse zusammenwirkt und andererseits zumindest mittelbar an einem Kopf des Befestigungselements abgestützt ist. Dadurch ist eine beidseitige Fixierung der innenliegenden Schicht des Dämpfungselements gewährleistet.It is advantageous that the fastening sleeve has on its outer side a recess with at least one shoulder and that the inner layer of the damping element is inserted into the recess of the fastening sleeve, that the inner layer of the damping element along the longitudinal axis cooperates form-fitting manner with the shoulder of the fastening sleeve. Here, it is also advantageous that the inner layer of the damping element on the one hand along the longitudinal axis positively cooperates with the shoulder of the fastening sleeve and on the other hand is at least indirectly supported on a head of the fastener. As a result, a bilateral fixation of the inner layer of the damping element is ensured.
Bevorzugte Ausführungsbeispiele der Erfindung sind in der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen, in denen sich entsprechende Elemente mit übereinstimmenden Bezugszeichen versehen sind, näher erläutert. Es zeigt:
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Fig. 1 eine Brennstoffeinspritzanlage mit einem Brennstoffverteiler und mehreren Haltern, die zum Befestigen des Brennstoffverteilers an einer Anbaustruktur dienen, in einer auszugsweisen, schematischen Schnittdarstellung entsprechend einem ersten Ausführungsbeispiel der Erfindung; -
Fig. 2 einen auszugsweisen Schnitt durch die in derFig. 1 dargestellte Brennstoffeinspritzanlage entsprechend dem ersten Ausführungsbeispiel entlang der mit II bezeichneten Schittlinie; -
Fig. 3 einen schematischen Schnitt durch ein Dämpfungselement des inFig. 2 dargestellten Halters entlang der mit III bezeichneten Schnittlinie; -
Fig. 4 die inFig. 2 dargestellte Brennstoffeinspritzanlage in einer auszugsweisen Schnittdarstellung entsprechend einem zweiten Ausführungsbeispiel der Erfindung und -
Fig. 5 die inFig. 2 dargestellte Brennstoffeinspritzanlage in einer auszugsweisen Schnittdarstellung entsprechend einem dritten Ausführungsbeispiel der Erfindung.
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Fig. 1 a fuel injection system with a fuel distributor and a plurality of holders, which serve for fastening the fuel distributor to a mounting structure, in an excerpt, schematic sectional view according to a first embodiment of the invention; -
Fig. 2 an excerpted section through the in theFig. 1 illustrated fuel injection system according to the first embodiment along the designated Schmitt line II; -
Fig. 3 a schematic section through a damping element of inFig. 2 shown holder along the designated III section line; -
Fig. 4 in theFig. 2 illustrated fuel injection system in a partial sectional view according to a second embodiment of the invention and -
Fig. 5 in theFig. 2 illustrated fuel injection system in a partial sectional view according to a third embodiment of the invention.
In einer entsprechenden Abwandlung können die Halter 3 bis 5 auch zum Befestigen anderer Komponenten an einer Anbaustruktur 23 dienen.In a corresponding modification, the holders 3 to 5 can also serve for fastening other components to a mounting
Der Grundkörper 20 weist eine Durchgangsbohrung 24 auf. Die Achse 22 ist zugleich die Achse (Längsachse) 22 der Durchgangsbohrung 24. Das Befestigungselement 21 erstreckt sich zum Befestigen des Grundkörpers 20 an der Anbaustruktur 23 entlang der Längsachse 22 der Durchgangsbohrung 24 des Grundkörpers 20 durch die Durchgangsbohrung 24 und ein in der Durchgangsbohrung 24 angeordnetes Dämpfungselement 25. Hierbei ist außerdem eine Befestigungshülse 26 vorgesehen, die entlang der Längsachse 22 ausgerichtet ist und durch die sich das Befestigungselement 21 erstreckt. Durch Einschrauben des Befestigungselements 21 in die Anbaustruktur 23 wird die Befestigungshülse 26 zwischen einem Kopf 27 und einer Oberseite 28 der Anbaustruktur 23 eingespannt und fixiert.The
Die mechanische Verbindung zwischen dem Kopf 27 und dem Grundkörper 20 des Halters 3 kommt über die Befestigungshülse 26 und das Dämpfungselement 25 zustande. Im montierten Zustand erfolgt die Befestigung des Grundkörpers 20 an der Anbaustruktur 23 somit unter anderem über das Dämpfungselement 25. Im Betrieb auftretende Schwingungen oder dergleichen wirken hauptsächlich entlang der Längsachse 22. Diese Schwingungen entlang der Längsachse 22 können in vorteilhafter Weise durch das Dämpfungselement 25 bedämpft werden. Insbesondere ist eine Schwingungsausbreitung von dem Verteilerrohr 14 des Brennstoffverteilers 2 auf die Anbaustruktur 23 durch das Dämpfungselement 25 wirksam bedämpft.The mechanical connection between the
Die Ausgestaltung des Halters 3 ist im Folgenden auch unter Bezugnahme auf die
Der Grundkörper 20 weist an einer Innenseite 34 eine Vertiefung 35 auf. Die Vertiefung 35 des Grundkörpers 20 erstreckt sich bezüglich der Längsachse 22 umfänglich um 360°. Das Dämpfungselement 25 weist in diesem Ausführungsbeispiel eine innenliegende Schicht 36, eine außenliegende Schicht 37 und eine zwischen der innenliegenden Schicht 36 und der außenliegenden Schicht 37 angeordnete Dämpfungsschicht 38 auf. Die außenliegende Schicht 37 des Dämpfungselements 25 ist in die Vertiefung 35 des Grundkörpers 20 eingesetzt. Hierfür wird das Dämpfungselement 25 zusammengedrückt, so dass sich der Außendurchmesser 30 reduziert. Im zusammengedrückten Zustand wird das Dämpfungselement 25 in die Durchgangsbohrung 24 des Grundkörpers 20 eingebracht. Anschließend wird das Dämpfungselement 25 wieder entlastet, so dass sich sein Außendurchmesser 30 wieder vergrößert. Die außenliegende Schicht 37 des Dämpfungselements 25 ist dann beidseitig formschlüssig mit dem Grundkörper 20 verbunden.The
Anschließend kann die Befestigungshülse 26 in die Durchgangsbohrung 24 eingebracht werden. Die Befestigungshülse 26 weist an ihrer Außenseite 39 eine Vertiefung 40 auf. In diesem Ausführungsbeispiel weist die Befestigungshülse 26 an ihrer Außenseite 39 eine Vertiefung 40 mit einem Absatz 41 auf. Die innenliegende Schicht 36 des Dämpfungselements 25 ist im montierten Zustand so in die Vertiefung 40 der Befestigungshülse 26 eingefügt, dass die innenliegende Schicht 36 des Dämpfungselements 25 entlang der Längsachse 22 formschlüssig mit dem Absatz 41 der Befestigungshülse 26 zusammenwirkt. Hierdurch ist das Dämpfungselement 25 entlang der Längsachse 22 einseitig formschlüssig mit der Befestigungshülse 26 verbunden. Ferner ist durch die in die Vertiefung 35 eingesetzte außenliegende Schicht 37 das Dämpfungselement 25 entlang der Längsachse 22 beidseitig beziehungsweise zweiseitig formschlüssig mit dem Grundkörper 20 verbunden.Subsequently, the
In diesem Ausführungsbeispiel umschließt das Dämpfungselement 25 im montierten Zustand die Außenseite 39 der Befestigungshülse 26 teilweise, da das Dämpfungselement 25 geschlitzt ausgestaltet ist, wie es in der
Die innenliegende Schicht 36 des Dämpfungselements 25 ist als starre innenliegende Schicht 36 ausgestaltet. Hierbei kann die innenliegende Schicht 36 insbesondere als metallische innenliegende Schicht 36 ausgebildet sein. Entsprechend ist die außenliegende Schicht 37 als starre außenliegende Schicht 37 ausgestaltet. Die außenliegende Schicht 37 kann insbesondere als metallische außenliegende Schicht 37 ausgebildet sein. Die Dämpfungsschicht 38 ist einerseits stoffschlüssig mit der innenliegenden Schicht 36 und andererseits stoffschlüssig mit der außenliegenden Schicht 37 verbunden. Schwingungen entlang der Längsachse 22 wirken sich somit in einer Scherung der Dämpfungsschicht 38 aus. Somit steht gewissermaßen ein großer Querschnitt der Dämpfungsschicht 38 zur Verfügung, über den sich die auftretenden Kräfte verteilen. Dadurch sind die auftretenden Spannungen in der Dämpfungsschicht 38 entsprechend gering.The
Das Dämpfungselement 25 kann somit federnd ausgeführt werden, um es in die Vertiefung 35 des Grundkörpers 20 einzusetzen. Durch die federnde Eigenschaft vergrößert das Dämpfungselement 25 bei der Montage wieder seinen Außendurchmesser 30, so dass es in der Endlage eine formschlüssige Verbindung mit dem Grundkörper 20 sicherstellt. Der Außendurchmesser 30 des Dämpfungselements 25 kann hierbei gleich einem Innendurchmesser 42 der Vertiefung 35 des Grundkörpers 20 sein.The damping
In diesem Ausführungsbeispiel weist der Grundkörper 20 an seiner Innenseite 34 die Vertiefung 35 mit einem Absatz 45 auf, wobei die außenliegende Schicht 37 des Dämpfungselements 25 in die Vertiefung 35 des Grundkörpers 20 eingefügt ist. Die außenliegende Schicht 37 des Dämpfungselements 25 wirkt somit einerseits entlang der Längsachse 22 formschlüssig mit dem Absatz 45 an der Vertiefung 35 des Grundkörpers 20 zusammen. Andererseits ist in die Vertiefung 35 des Grundkörpers 20 eine Klemmhülse 46 eingepresst. Somit wirkt die außenliegende Schicht 37 des Dämpfungselements 25 andererseits entlang der Längsachse 22 formschlüssig mit der Klemmhülse 46 zusammen, die in den Grundkörper 20 eingepresst ist. Somit ist eine beidseitige formschlüssige Verbindung zwischen der außenliegende Schicht 37 und dem Grundkörper 20 gebildet.In this embodiment, the
Die innenliegende Schicht 36 des Dämpfungselements 25 wirkt einerseits mit dem Absatz 41 der Vertiefung 40 der Befestigungshülse 26 und andererseits mit der Oberseite 28 der Anbaustruktur 23 zusammen. Somit ist entlang der Längsachse 22 auch eine beidseitige Fixierung der innenliegenden Schicht 36 gegeben.The
Das Dämpfungselement 25 kann in diesem Ausführungsbeispiel in Form einer geschlitzten Hülsen ausgestaltet sein, wie es anhand der
Es ist anzumerken, dass das Dämpfungselement 25 auch stoffschlüssig mit der Befestigungshülse 26 verbunden sein kann. Bei dieser Ausgestaltung kann die innenliegende Schicht 36 des Dämpfungselements 25 entfallen und die Dämpfungsschicht 38 kann direkt mit der Außenseite 39 der Befestigungshülse 26 verbunden werden. Bei dieser Ausgestaltung kann die Außenseite 39 der Befestigungshülse 26 auch zylindermantelförmig ausgestaltet sein.It should be noted that the damping
Somit kann die relativ steife Anbindung des Brennstoffverteilers 2 trotz des Dämpfungselements 25 beibehalten werden. Die Elastizität der Befestigung des Brennstoffverteilers 2 erhöht sich gegebenenfalls nur leicht. Somit sind alle Funktionsanforderungen, insbesondere eine geringe Relativbewegung des Brennstoffverteilers 2 und der damit verbundenen Einspritzventile 10 bis 13 zu der Anbaustruktur 23, und Festigkeitsanforderungen, insbesondere eine Belastbarkeit der Befestigungselemente 21, erfüllt. Somit werden Akustik-, Funktions- und Festigkeitsanforderungen, die sich aus dem Design des Brennstoffverteilers 2 ergeben, gleichzeitig erfüllt.Thus, the relatively stiff connection of the
Die Schwingungsamplituden und somit eine Vibrationsbelastung auf den Brennstoffverteiler 2 und auf die angeschlossenen Komponenten, wie beispielsweise einen Drucksensor und einen Stecker, werden verringert.The vibration amplitudes and thus a vibration load on the
Die Körperschallanregung der Brennkraftmaschine auf den Brennstoffverteiler 2 kann durch das Dämpfungselement 25 reduziert werden. Die geringe Vibrationsbelastung des Brennstoffverteilers 2 ist ebenfalls vorteilhaft.The structure-borne sound excitation of the internal combustion engine on the
Die vom Brennstoffverteiler 2 direkt abgestrahlten Geräuschanteile können durch die erhöhte Bauteildämpfung aufgrund des Dämpfungselements 25 reduziert werden.The directly emitted by the
Durch die Reduzierung der Körperschallübertragung sinkt auch die durch Körperschall angeregte Luftschallabstrahlung von der Anbaustruktur 23. Außerdem wird die Körperschallübertragung über weitere Bauteile auf eine Karosserie oder dergleichen reduziert. In allen Fällen wird dadurch die Geräuschentstehung gemildert.Due to the reduction in structure-borne sound transmission, the airborne sound radiation excited by structure-borne noise also falls from the mounting
Ferner ist der erforderliche Bauraum, der von dem Dämpfungselement 25 benötigt wird, sehr gering, wodurch sich kein wesentlicher zusätzlicher Bauraum für die Halter 3, 4, 5 ergibt. Dies hängt damit zusammen, dass das Dämpfungselement 25 in Hülsen- oder Teilhülsenform optimal die ohnehin benötigte Klemmlänge des Befestigungselements 21 zum Ausgleich von Relaxation im Befestigungsverbund, insbesondere Schraubverbund, nutzen kann.Furthermore, the space required by the damping
Die Entkopplung kann an einem direkt angebundenen Brennstoffverteiler 2 verwendet werden, bei dem die Einspritzventile 10 bis 13 beispielsweise über O-Ringe vorgespannt in den Tassen 6 bis 9 fixiert sind. In Richtung der Einspritzventile 10 bis 13 liegen die Einspritzventile 10 bis 13 dann nicht an einem durch den Brennstoffverteiler 2 gegebenen Anschlag an. Stattdessen werden die Einspritzventile 10 bis 13 durch die aus dem Raildruck resultierende Kraft gegen die Anbaustruktur 23, insbesondere den Zylinderkopf 23, gepresst und dadurch fixiert.The decoupling can be used on a directly connected
Die Entkopplung kann an einem leitungsangebundenen Brennstoffverteiler 2 oder an einem injektorseitig entkoppelten Brennstoffverteiler 2 zum Einsatz kommen, bei dem die Einspritzventile 10 bis 13 entweder formschlüssig über eine Leitung mit dem Brennstoffverteiler 2 verbunden sind oder alternativ formschlüssig mit dem Brennstoffverteiler 2 verbunden sind, beispielsweise über Clipse, Rastnasen oder eine Verschraubung. In diesem Fall werden von den Dämpfungselementen 25 ausschließlich Betriebslasten aus dem Brennraumdruck und aus der Schwingbelastung der Brennkraftmaschine aufgenommen.The decoupling can be used on a line-connected
Durch das Vermeiden von statischen Vorspannkräften, wie zum Beispiel Schraubenvorspannkräften, auf die Dämpfungselemente 25 kann die Steifigkeit der Halter 3 bis 5 bei Nutzung der Dämpfungselemente 25 in Hülsenform oder Teilhülsenform optimal an die Bedürfnisse zur akustischen Optimierung angepasst werden, wobei insbesondere eine relativ weiche Ausgestaltung möglich ist.By avoiding static biasing forces, such as screw biasing forces, on the damping
Durch die Verwendung des Scherprinzips der Dämpfungselemente 25 verteilt sich die Betriebslast auf große Flächen. Eine Überlastung des Werkstoffs, insbesondere Elastomerwerkstoffs, des Dämpfungselements 25 für die Dämpfungsschicht 38 kann somit wirksam vermieden werden.By using the shearing principle of the damping
Ferner zeichnet sich das Dämpfungselement 25 durch eine einfache Herstellbarkeit und somit durch geringe Herstellungskosten aus. Speziell kann ein ebenes Verbundblech zugeschnitten und gebogen werden, um hülsenförmige oder teilhülsenförmige Dämpfungselemente 25 herzustellen. Die Dämpfungsschicht 38 kann hierbei durch Auf- oder Einlaminieren hergestellt werden. Eine weitere Herstellungsmöglichkeit besteht darin, dass Rohrabschnitte von unterschiedlichem Durchmesser mittels einlaminierter Elastomerschichten verbunden werden und damit geschlossene hülsenförmige Dämpfungselemente 25 hergestellt werden.Furthermore, the damping
Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt.The invention is not limited to the described embodiments.
Claims (10)
- Holder (3) for the fastening of a component (2), in particular a fuel distributor (2), to an attachment structure (23), in particular of an internal combustion engine (23), having a main body (20) which is able to be connected to the component (2), and having a fastening element (21) which, for the fastening of the main body (20) to the attachment structure (23), extends along a longitudinal axis (22) of a passage bore (24) of the main body (20) through the passage bore (24) of the main body (20) and through a damping element (25) arranged in the passage bore (24), wherein a fastening sleeve (26) is provided, wherein the damping element (25) at least partially surrounds an outer side (39) of the fastening sleeve (26), and wherein the damping element (25) is connected to the fastening sleeve (26) in a form-fitting manner and/or materially-bonded manner at least on one side along the longitudinal axis (22),
and the damping element (25) is connected to the main body (20) in a form-fitting manner at least on one side along the longitudinal axis (22), characterized
in that at least one rigid inner layer (36) of the damping element (25) is connected to the fastening sleeve (26) in a form-fitting manner at least on one side along the longitudinal axis (22), in that at least one rigid outer layer (37) of the damping element (25) is connected to the main body (20) in a form-fitting manner at least on one side along the longitudinal axis (22), and in that at least one elastically deformable damping layer (38) is arranged between the inner layer (36) and the outer layer (37). - Holder according to Claim 1,
characterized
in that the at least one inner layer (36), the at least one damping layer (38) and the at least one outer layer (37) are connected to one another in a materially-bonded manner. - Holder according to Claim 1 or 2,
characterized
in that the rigid inner layer (36) is formed as a metallic inner layer (36), and in that the rigid outer layer (37) is formed as a metallic outer layer (37). - Holder according to one of Claims 1 to 3,
characterized
in that the main body (20) has a recess (35) on an inner side (34), and in that the outer layer (37) of the damping element (25) is inserted into the recess (35) of the main body (20) in such a way that the outer layer (37) of the damping element (25) is connected to the main body (20) in a form-fitting manner on both sides along the longitudinal axis (22). - Holder according to Claim 4,
characterized
in that the damping element (25) is designed in the form of a sleeve (25) which is split along the longitudinal axis (22). - Holder according to one of Claims 1 to 3,
characterized
in that the main body (20) has a recess (35) with a shoulder (45) on an inner side (34), in that the outer layer (37) of the damping element (25) is inserted into the recess (40) of the main body (20), in that, on the one hand, the outer layer (37) of the damping element (25) interacts with the shoulder (45) at the recess (35) of the main body (20) in a form-fitting manner along the longitudinal axis (22), and in that, on the other hand, the outer layer (37) of the damping element (25) interacts with a clamping sleeve (46), which is pressed into the recess (35) of the main body (20), in a form-fitting manner along the longitudinal axis (22). - Holder according to Claim 6,
characterized
in that the damping element (25) is designed as a sleeve-like damping element (25). - Holder according to one of Claims 1 to 7,
characterized
in that the fastening sleeve (26) has a recess (40) with at least one shoulder (41) on its outer side (39), and in that the inner layer (36) of the damping element (25) is inserted into the recess (40) of the fastening sleeve (26) in such a way that the inner layer (36) of the damping element (25) interacts with the shoulder (41) of the fastening sleeve (26) in a form-fitting manner along the longitudinal axis (22). - Holder according to Claim 8,
characterized
in that, on the one hand, the inner layer (36) of the damping element (25) interacts with the shoulder (41) of the fastening sleeve (26) in a form-fitting manner along the longitudinal axis (22) and, on the other hand, is supported at least indirectly against a head (27) of the fastening element (21) - Fuel injection system (1) having a fuel distributor (2) and at least one holder (3, 4, 5) according to one of Claims 1 to 9, which holder serves for the fastening of the fuel distributor (2) to the attachment structure (23).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL13718582T PL2864625T3 (en) | 2012-06-20 | 2013-04-24 | Retainer for mounting a fuel distributor on an internal combustion engine and fuel injection system with such a retainer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012210369A DE102012210369A1 (en) | 2012-06-20 | 2012-06-20 | Holder for fixing a fuel distributor to an internal combustion engine and fuel injection system with such a holder. |
PCT/EP2013/058485 WO2013189637A1 (en) | 2012-06-20 | 2013-04-24 | Retainer for mounting a fuel distributor on an internal combustion engine and fuel injection system with such a retainer |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2864625A1 EP2864625A1 (en) | 2015-04-29 |
EP2864625B1 true EP2864625B1 (en) | 2018-04-04 |
Family
ID=48184205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13718582.3A Active EP2864625B1 (en) | 2012-06-20 | 2013-04-24 | Retainer for mounting a fuel distributor on an internal combustion engine and fuel injection system with such a retainer |
Country Status (7)
Country | Link |
---|---|
US (1) | US9863387B2 (en) |
EP (1) | EP2864625B1 (en) |
KR (1) | KR102074655B1 (en) |
DE (1) | DE102012210369A1 (en) |
ES (1) | ES2676188T3 (en) |
PL (1) | PL2864625T3 (en) |
WO (1) | WO2013189637A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012206931A1 (en) * | 2012-04-26 | 2013-10-31 | Robert Bosch Gmbh | Arrangement with a fuel distributor and a holder |
DE102012206937A1 (en) * | 2012-04-26 | 2013-10-31 | Robert Bosch Gmbh | Arrangement with a fuel distributor and a holder |
DE102013207368A1 (en) * | 2013-04-23 | 2014-10-23 | Robert Bosch Gmbh | Holder for mounting a fuel distributor to an internal combustion engine and system with such a holder |
KR101777062B1 (en) * | 2016-10-21 | 2017-09-08 | 주식회사 현대케피코 | Mounting structure of fuel rail |
DE102019220377A1 (en) | 2019-12-20 | 2021-06-24 | Robert Bosch Gmbh | Fluid distributor for an injection system, in particular a fuel distributor strip for a fuel injection system for mixture-compressing, externally ignited internal combustion engines |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1800434A (en) * | 1929-10-17 | 1931-04-14 | Inland Mfg Co | Resilient engine mount |
DE3915111A1 (en) * | 1989-05-09 | 1990-11-15 | Bosch Gmbh Robert | FUEL DISTRIBUTOR FOR FUEL INJECTION SYSTEMS OF INTERNAL COMBUSTION ENGINES |
US5131638A (en) * | 1990-10-01 | 1992-07-21 | Gencorp Inc. | Dual shock mount |
US5513603A (en) * | 1995-08-11 | 1996-05-07 | Chrysler Corporation | Seal and fastener isolator system for a valve cover |
DE10215883B4 (en) * | 2002-04-11 | 2005-09-08 | Kamax-Werke Rudolf Kellermann Gmbh & Co. Kg | Connecting element with a screw and a captive arranged support element |
US6591801B1 (en) * | 2002-06-11 | 2003-07-15 | General Motors Corporation | Engine cover balanced isolated support and seal |
DE102005008038A1 (en) | 2005-02-22 | 2006-08-24 | Robert Bosch Gmbh | Fuel dosing device for fuel injection system of internal combustion engine, has casing consisting of noise absorbing plastic such as polyamide and polybutylene and die-casted around fuel distributor and injection valves |
US7682117B2 (en) | 2006-09-27 | 2010-03-23 | Illinois Tool Works Inc. | Work piece isolating assembly |
EP2363593B1 (en) * | 2010-03-04 | 2013-05-15 | Continental Automotive GmbH | Coupling device |
US8875681B2 (en) * | 2011-10-28 | 2014-11-04 | Robert Bosch Gmbh | Fuel rail mounting arrangement |
-
2012
- 2012-06-20 DE DE102012210369A patent/DE102012210369A1/en not_active Withdrawn
-
2013
- 2013-04-24 ES ES13718582.3T patent/ES2676188T3/en active Active
- 2013-04-24 KR KR1020147035729A patent/KR102074655B1/en active IP Right Grant
- 2013-04-24 PL PL13718582T patent/PL2864625T3/en unknown
- 2013-04-24 EP EP13718582.3A patent/EP2864625B1/en active Active
- 2013-04-24 US US14/408,816 patent/US9863387B2/en active Active
- 2013-04-24 WO PCT/EP2013/058485 patent/WO2013189637A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
KR102074655B1 (en) | 2020-02-07 |
ES2676188T3 (en) | 2018-07-17 |
DE102012210369A1 (en) | 2013-12-24 |
EP2864625A1 (en) | 2015-04-29 |
WO2013189637A1 (en) | 2013-12-27 |
US9863387B2 (en) | 2018-01-09 |
US20150204295A1 (en) | 2015-07-23 |
PL2864625T3 (en) | 2018-08-31 |
KR20150020582A (en) | 2015-02-26 |
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