DE102016111970A1 - Heat shield for an internal combustion engine and internal combustion engine with a heat shield - Google Patents

Abstract

The invention relates to a heat shield for an internal combustion engine (32) from a plate-like material blank, wherein on the material blank a shielding surface (18) is formed, wherein from the material blank in one piece with the shielding surface (18) at least one fastening element (20) for fixing a conduit (36) is formed. The invention also relates to a cylinder head cover (10) and an internal combustion engine (32) with a heat shield (12).

Description

The invention relates to a heat shield for an internal combustion engine according to the preamble of claim 1 and an internal combustion engine with a heat shield.

Heat shields are regularly used in practice for shielding an internal combustion engine from heat radiation from adjacent heat-generating elements. In particular, heat shields are used to protect a cylinder head cover and associated elements such as seals on an internal combustion engine from the waste heat of a turbocharger or other heat-generating components in the region of an exhaust line.

Out DE 198 15 284 A1 is an insulating device for shielding of heat-sensitive components, such as a cylinder head cover of an internal combustion engine known. The insulating device is designed as an insulating layer of a foil. Preferably, the film is glued flat with the cylinder head cover.

Out DE 10 2007 038 768 A1 is a fastening device on a motor vehicle for fixing a Wärmeabschirmbleches known. For this purpose, the heat shield has a plurality of retaining tabs which can each be inserted into a tab receptacle of a component to be protected against the heat, in particular a cylinder head cover.

For space-technical reasons, it may happen that lines that run in the range of an internal combustion engine can not be attached to the engine itself, but must be fixed in the heat shield.

The invention has for its object to provide a heat shield for an internal combustion engine and an internal combustion engine available to which a simple and inexpensive way a line can be fixed.

The object is achieved according to the invention with the features of the independent claims. Further practical embodiments and advantages of the invention are described in connection with the dependent claims.

An inventive heat shield for an internal combustion engine is made of a plate-like material blank. At the material blank a shielding surface is formed, in particular for the protection of an element of the internal combustion engine, such as. B. a cylinder head cover and a functionally associated seal before heat radiation from another, heat radiating element, in particular of a turbocharger. From the material blank is integrally formed with the shielding at least one fastening element for fixing a conduit. Under lines are understood in the present case both electrical and fluid lines (media lines) and other lines, the invention has been developed essentially for flexible electrical lines. The one-piece design of the shielding and the fastener from the material blank has the advantage that the fastener can be easily and inexpensively generated. An additional manufacturing and assembly costs for separate, to be mounted fasteners deleted. In addition, no fasteners for separate fasteners are required.

By the term shielding surface is meant in the present case in particular a wall-shaped separating element which is used to separate a first region, in particular a region of an internal combustion engine with at least one heat-generating component, from a second region, preferably a metal sheet which has a uniform material thickness and if necessary pressed into a suitable shape. As the shielding the separation plane provided for separation is considered, which is limited by the outer contour of the separating element. The fastening element of a heat shielding plate according to the invention can be designed to be outstanding parallel or transverse to the parting plane with respect to this parting plane. Preferably, it is excellently formed in a direction transverse to the parting plane, so that it is within the first region or within the second region and is thus arranged at a distance from the parting plane.

Fastening sections can be produced in a particularly simple and cost-effective manner by forming, in particular by forming a tab-like forming section on the material blank for a fastening section to be produced, which section is formed into a fastening element. Particularly suitable are in particular bending forming processes, by means of which rounded bending points are produced, such as roll or roll bending. In principle, however, any other forming process is also applicable.

The heat shield is preferably made of a metal material, in particular aluminum or steel, for example, as a thin sheet with a maximum thickness of 2 mm. Preferably, the thickness is at most 1 mm and more preferably about 0.5 mm. A heat shield with a maximum thickness of 2 mm can be simple and inexpensive be converted by molding into a desired geometry to form the fastener. Despite the preferred low material thickness, the heat shield should preferably be a dimensionally stable component, which may be flexible but forms a shielding surface even if it is attached only at a few points to another component, in particular on two outer sides and / or by a small number of screws.

For the sake of completeness, it is pointed out that a plurality of fastening elements for fixing one or more lines may be integrally formed on the shielding surface.

In order to reduce the risk of damage to a line to be inserted into the fastening element, the fastening element can, viewed in cross section, have an arcuate geometry, at least in a partial region. It is particularly advantageous if the fastening element-in particular on the inside-has an exclusively arc-shaped geometry in cross-section, that is to say that it is angled. H. completely free of sharp-edged geometries that could damage a line to be held by the fastener. An arcuate geometry can also be easily and inexpensively produced by forming.

In a practical embodiment of a heat shielding plate according to the invention, the fastening element may have a longitudinal extent which corresponds to the extension direction of a line to be fastened, so that a line can be guided and held over the length of the fastening element extending in the longitudinal extension direction. Transversely to the longitudinal extension, a taper can be formed on the fastening element as an elastically expandable insertion section for insertion of a line in an insertion direction E transversely to the direction of extension of the line, wherein viewed in the insertion direction E of the line behind the tapered insertion section opposite to the tapered insertion section in cross section expanded warehouse area connects. In this case, the insertion direction E in the installation position of the Wärmeabschirmbleches is preferably oriented at least partially in the direction of gravitational force g, because then counteracts the emergence of the line, the gravitational force g. With a tapered insertion section a - possibly in addition to the gravitational force g - a leakage of a line from the fastener counteracting functional means is realized, which can be realized easily and inexpensively on a heat shield. This embodiment has the further advantage that the lines can be quickly and easily assembled and disassembled by pushing in and out.

Particularly preferred is a fastener whose insertion and / or storage area is elastically expandable, in particular such that a line can be clamped in an elastically expandable insertion and / or storage area. By elastically expandable is meant in the present case that by means of tools, with the hand or the line a tapered section can be widened by elastic expansion by applying a Aufweitkraft to a width which allows to remove the line from the fastener or in a storage area contribute. As soon as the expanding force is reduced or completely removed, the width decreases again due to the elasticity, so that the above-mentioned form-locking securing action of the tapered insertion section is restored.

When viewed in the direction of insertion of the line, behind the tapered insertion section, a storage area expanded in cross section relative to the tapered insertion section can be designed for one or more lines. For assembly, the line can be pressed in this case by the tapered insertion, for which purpose an elastic expansion of the tapered insertion section is required and accordingly a Aufweitkraft must be overcome.

The bearing area preferably has a cross-sectional geometry which is adapted to the line, in particular approximately circular, in order to enclose the line with as little mechanical stress as possible. The storage area can also be designed so that it clampingly fixes a line arranged in this, in order to avoid relative movements of a fixed line relative to the fastening element.

As manufacturing technology and functional for the assembly, a fastener has been found that has a cross-section Ω-shaped and / or spiral geometry. Such geometries can be produced simply and inexpensively by means of deformation, in particular bending deformation, from a sheet-metal section and permit intuitive assembly and a mechanically less stressing fastening of lines.

In a further practical embodiment of the invention, a funnel-shaped expansion section can be formed at least on the outside of the tapered region. The spreading section preferably has a v-shaped or u-shaped geometry, in particular such that a force acting in the insertion direction of the line at least partially results in a, an elastic widening Transverse force is converted, ie the tapered portion is spread by exerting a force in the insertion direction to the outside and expands accordingly. Such a spreading section facilitates insertion and installation of a conduit. By an analogous inside training of a corresponding expansion section, ie, an inside funnel-shaped spreading, the disassembly can be facilitated accordingly. An expansion section which is funnel-like on the inside can be designed as an alternative or in addition to an expansion section formed on the outside in the manner of a funnel.

It may also be desirable to make disassembly difficult to counteract inadvertent disassembly. In this case, close to the tapered insertion section inside viewed in cross-section preferably perpendicular to the insertion direction E oriented walls of the fastener, or the walls are funnel-shaped in an insertion section of the storage area such that an expansion of the tapered insertion in a movement of a counteracted arranged in the storage area line and possibly additional rejuvenation is effected.

The fastening element is preferably formed on a peripheral edge of the material blank, in particular in the manner of a material tab which protrudes from adjacent peripheral edge regions. Such a tab is easily accessible for forming tools and allows to produce a fastener particularly easily and inexpensively by forming.

For the sake of completeness, it is pointed out that it is also possible to form a fastening element integrally within a shielding surface, in particular by punching out a tab-like section or in other suitable manner and then forming it, in particular by means of a bending deformation.

The invention also relates to an internal combustion engine with a cylinder head cover and a heat shield as described above, wherein the heat shield is attached to the cylinder head cover. The attachment can be done for example by means of through openings in the heat shield and this through-openings using screw, by inserting lateral peripheral edges of the Wärmeabschirmbleches in corresponding guides and / or by means of other known form, force and / or material connection methods.

In a practical embodiment of an internal combustion engine according to the invention, the heat shield is arranged as a separating element between at least one outer region of the internal combustion engine and a heat-generating element, in particular functionally coupled to the internal combustion engine. In particular, the heat-generating element may be a turbocharger. The heat shield is preferably arranged on an internal combustion engine such that it protects a cylinder head cover connected to the internal combustion engine from the generated heat of the heat generating element. For this purpose, it is particularly preferred if the fastening element is formed on the side facing away from the heat-generating element side of the Wärmeabschirmbleches. In this case, the line guided by means of fastening element is additionally protected, in particular if the shielding surface is arranged as an additional separating element between a bearing region and the heat-generating element.

In another practical embodiment, a line within the fastener to the heat shield is positively and / or non-positively fixed in the fastener, and / or the line is due to the geometric design of the fastener force and / or positively caught in the fastener. For a positive fixation of the line, the fastening element may have a closed, hollow cylindrical geometry with an opening oriented in the extension direction of the line through which the line must be guided in the direction of extent. In this case, the fastener may have a closed profile and completely enclose the conduit. A positive fixation can also be done by a fastener, which can - for example by means of a simple folding mechanism - open and close.

Alternatively or in addition thereto, a storage area may in particular claw-like extend around a line, wherein an opening is closed transversely to the direction of extension of the line of a tapered insertion at least as far as a line only after overcoming a Aufweitkraft a tapered insertion section by elastic expansion of the opening across can be removed to the extension direction of the line. A Aufweitkraft is always required when the diameter or the smallest width of the line is greater than the width of a tapered insertion section, which is arranged between a bearing portion of the fastener and the environment. Preferably, the further opening is oriented such that a line can be inserted at least partially in the direction of the gravitational force g in the fastener and at least partially against the direction of Earth's gravity g has to be removed from the opening.

A storage area of a fastening element can also be geometrically shaped in such a way that it clampingly holds an inserted line in the storage area, in particular by designing the storage area such that it widens in a flexurally elastic manner during insertion of a line.

Further practical embodiments of the invention are described below in conjunction with the drawings. Show it:

1 a cylinder head cover with a heat shield according to the invention in a perspective view,

2 only the heat shield off 1 in a perspective view,

3 the in 1 III area of the cylinder head cover with the fastening element of the Wärmeabschirmbleches in an enlarged perspective view,

4 an arrangement of a Wärmeabschirmbleches invention between an internal combustion engine and a turbocharger in a sectional view,

5a a cross section of a fastener with a further geometry,

5b a cross section of a fastener with a further geometry,

5c a cross section of a fastener with a further geometry and

5d a cross section of a fastener with a further geometry.

In 1 is a cylinder head cover 10 an internal combustion engine (not shown) shown. The cylinder head cover 10 is formed in the embodiment shown from plastic. However, it can also be made of other materials.

At the bottom of the cylinder head cover 10 is a seal all around 14 for sealing the cylinder head cover 10 arranged opposite an internal combustion engine (not shown). On the cylinder head cover 10 is, inter alia, a membrane 16 arranged for a pressure control valve.

To the cylinder head cover 10 and the associated elements, in particular the membrane 16 and the seal 14 to protect against excessive heat, here from at least one, not shown, heat radiating component right of the cylinder head cover 10 is generated, is a heat shield 12 as a separating element immediately adjacent to the cylinder head cover 10 right on the cylinder head cover 10 arranged. The heat shield 12 Insofar forms a parting plane between the heat-radiating component, not shown, right from the heat shield 12 and the area to the left with the cylinder head cover 10 , The heat shield 12 is made of a plate-like material blank. Integral to the shielding surface 18 for heat shield is a fastener 20 for fixing a line (not shown here) formed. The heat shield 12 is in this case made of aluminum and has a thickness of 0.5 mm.

The shielding surface 18 of the heat shielding plate 12 is by means of three plug connections 22 and by means of two screws 24 on the cylinder head cover 10 attached.

The geometric design of the fastener 20 is in the 2 and 3 to recognize. The fastener 20 has is formed in cross-section Ω-shaped and thus has an overall arcuate geometry. It extends over a length L, in the longitudinal direction of a in the fastener 20 to be used line (not shown) corresponds. The length L is a multiple of each extending perpendicular thereto dimensions of width and height.

To a line in the fastener 20 To arrange, this is from the top of the fastener 20 positioned and then in an insertion direction E, which here runs parallel to the effective direction of the gravitational force g, in the fastener 20 pressed. As in particular in 3 can be seen, is on the fastener 20 on the top side, a funnel-shaped spreading section 26 formed at which viewed in the insertion direction E, a tapered insertion section 28 and then a storage area 30 followed. The tapered introduction section 28 has in the embodiment shown in cross section a smaller width B _V , as compared to the tapered insertion 28 expanded storage area 30 with a maximum width B _L. Furthermore, the tapered insertion section 28 a smaller width B _V than the minimum width of an unillustrated lead to be inserted. Accordingly, a expanding force is required to such a line through the tapered insertion section 28 in the storage area 30 to push or return a line from the storage area 30 through the introduction section 28 to lead to dismantle the line.

The tapered introduction section 28 is here formed resiliently, and by introducing a line over the expansion section 26 in the insertion direction E is under the action of a Aufweitkraft the tapered insertion 28 pushed apart or spread apart, so that the line continues towards the storage area 30 can be performed. The shown heat shield 12 is at least in the region of the fastener 20 designed such that the insertion section 28 after a widening process for insertion or removal of a line again tapers to the width B _v .

The storage area 30 has in the embodiment shown a circular arc in cross-section geometry and encloses - as in 4 recognizable - an inserted line 36 therefore in the mounted state claw-like. Due to the reduced width B in the tapered insertion _V 28 of the fastener 20 acts to exit or remove the line 36 from the fastener 20 in addition to the gravitational force g the required Aufweitkraft contrary.

Based on 4 In the following, the mode of operation of the heat shielding sheet according to the invention will be explained 12 explained in connection with an internal combustion engine. Here is the heat shield 12 Although functionally identical to that in the 1 to 3 shown heat shield 12 , The fastener 20 however, was in the in 4 shown arrangement formed such that it is on the side of the cylinder head cover 10 on the through the heat shield 12 formed separating plane is located. Although it is a sectional view perpendicular to that through the heat shield 12 formed parting plane through the fastener 20 and through the inserted line 36 was acting in 4 dispensed with hatching. As in 4 Once again is clearly visible, is the heat shield 12 as a separating element between the cylinder head cover 10 and a heat-generating element 34 arranged to separate them from each other. In the heat-generating element 34 In the embodiment shown, this is a turbocharger 32 , The heat shield 12 in particular, a damage to the underside of the cylinder head cover 10 arranged seal 14 and immediately adjacent to the heat shield 12 arranged membrane 16 counteract by the action of heat.

As can also be seen, the fastener is 20 on the turbocharger 32 opposite side of the Wärmeabschirmbleches 12 arranged excellently in a direction transverse to the parting plane, so that in the fastener 20 arranged line 36 also through the shielding surface 18 of the heat shielding plate 12 is protected from excessive heat. A special protection of the line 36 results in the embodiment shown in that in addition to the shielding 18 also in the 4 Right boundary wall of the storage area 30 of the fastening element 20 as a partition between the pipe 36 and the turbocharger 32 is arranged. The administration 36 is therefore shielded here double-walled.

By multiple forming of several Ω-shaped mounting areas next to each other, the heat protection for the line 36 - If this is feasible installation space technology - be further increased, because thereby the number of partitions and the distance to the shielding 18 enlarge.

In the 5a - 5d are four other alternative geometric cross-sectional shapes of fasteners 20 shown. In connection with these geometric cross-sectional shapes, the same reference numerals are used below for identical or at least functionally identical elements as described above in connection with the Ω-shaped geometry.

In 5a is a fastener 20 shown with spiral cross-sectional geometry for introducing a line (not shown) in an insertion direction E parallel to the gravitational force g. The fastener 20 also has a funnel-shaped expansion section 26 and an elastically expandable, tapered insertion section 28 for positive securing a line (not shown) against a lead out. Further, below the tapered insertion section 28 a circular arc-shaped storage area 30 formed, which almost completely encloses an inserted line (not shown) mechanically only low-stressing and edge-free. Also in this embodiment, a widening force is required to insert or remove the pipe (not shown) when the width B _{V is} smaller than the smallest width or the diameter of the pipe to be fastened.

In 5b is a fastener 20 represented with a completely closed geometry. Such a geometry can be achieved by forming and properly joining a free end 38 a tab provided for forming are prepared, for. B. by pressing, bonding, cohesive bonding or otherwise. The storage area 30 has in this embodiment a closed in cross-section round, here approximately circular, geometry. A line (not shown) in this embodiment can only by threading and passing in the storage area 30 be introduced. Not shown line is characterized positively fixed in a direction transverse to its longitudinal extent.

5c shows a fastener 20 with a funnel-shaped, in cross-section v-shaped expansion section 26 , a tapered insertion section 28 and a storage area 30 , In this embodiment, the storage area 30 a reduced height H, which is smaller than the maximum width B _L. If the height H is also chosen to be smaller than the smallest width or diameter of a fixed pipe (not shown), the pipe will be in the storage area 30 clamped in the vertical direction. A clamping fixation can be realized analogously in the transverse direction by the dimensions B _L and H are reversed. The storage area 30 can also be designed for a clamping fixation both in the vertical direction and in the transverse direction.

The geometry of the fastener 20 in 5d has a rectangular cross-section shaped storage area 30 on. Similar to the in 5b geometry shown, the cross section is completely closed. Notwithstanding the embodiment of 5b is however the free end 38 of the fastening element 20 at the in 5d embodiment shown not firmly connected to the adjacent section, so that the closed geometry can be opened elastically, in particular a line in the storage area 30 introduce or remove.

In a corner area of the cross section of the storage area 30 is a section on this 40 formed with reduced material thickness and / or with increased elasticity. This results in a desired bending point in the manner of a film hinge. To this target bending point can be the free end 38 of the cross section along the double arrow can be folded over elastically, so that an opening is formed and a line (not shown) from above in the insertion direction E in the storage area 30 can be introduced. After the introduction of the line this is completely enclosed and thus securely fixed.

The features of the invention disclosed in the present description, in the drawings and in the claims may be essential both individually and in any desired combinations for the realization of the invention in its various embodiments. The invention may be varied within the scope of the claims and in consideration of the knowledge of the person skilled in the art.

LIST OF REFERENCE NUMBERS

10

Cylinder head cover

12

Heat shield

14

poetry

16

membrane

18

shielding

20

fastener

22

connector

24

screw

26

spreading

28

tapered insertion section

30

storage area

32

turbocharger

34

heat generating element

36

management

38

free end

40

thin material area

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19815284 A1 [0003]
• DE 102007038768 A1 [0004]

Claims (10)

Heat shield for an internal combustion engine ( 32 ) from a plate-like material blank, wherein on the material blank a shielding surface ( 18 ) is formed, characterized in that from the material blank in one piece with the shielding ( 18 ) at least one fastening element ( 20 ) for fixing a line ( 36 ) is trained. Heat shield according to the preceding claim, characterized in that the fastening element ( 20 ) is produced by forming. Heat shield according to one of the preceding claims, characterized in that the fastening element ( 20 ) viewed in cross-section, at least in a partial region has an arcuate geometry. Heat shield according to one of the preceding claims, characterized in that an elastically expandable tapered insertion section ( 28 ) for introducing a line ( 36 ) in an insertion direction (E) transversely to the direction of extension of the line ( 36 ) is formed and in the insertion direction (E) of the line ( 36 considered behind the tapered insertion section (FIG. 28 ) in relation to the tapered insertion section ( 28 ) expanded in cross section storage area ( 30 ) for a line ( 36 ) is trained. Heat shield according to one of the preceding claims, characterized in that the fastening element ( 20 ) has a cross-section Ω-shaped and / or spiral geometry. Heat shield according to one of the two preceding claims, characterized in that at least on the outside of the tapered insertion section ( 28 ) a funnel-shaped spreading section ( 26 ) is trained. Heat shield according to one of the preceding claims, characterized in that the fastening element ( 20 ) is formed on a peripheral edge of the material blank. Internal combustion engine with a cylinder head cover ( 10 ) and with a heat shield ( 12 ) according to one of the preceding claims, characterized in that the heat shield ( 12 ) on the cylinder head cover ( 10 ) is attached. Internal combustion engine according to the preceding claim, characterized in that the heat shield ( 12 ) as a separating element between at least one outer region of the internal combustion engine ( 32 ) and a heat-generating element ( 34 ) is arranged. Internal combustion engine according to one of the two preceding claims, characterized in that a line ( 36 ) within a fastener ( 20 ) of the heat shielding plate ( 12 ) positively and / or positively fixed and / or the line ( 36 ) due to the geometric design of the fastener ( 20 ) positively and / or positively in the fastener ( 20 ) is caught.

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