KR20190039720A - Methods for fastening high temperature articles to low temperature articles and arrangements for fastening high temperature articles to low temperature articles - Google Patents

Abstract

The present invention provides for mechanical stresses caused by thermal expansion of the exhaust module relative to the supports 26 and feet 24 by arranging the feet 24 of the exhaust module 14 to slide on the support surface 28 To a method and means for fastening an exhaust module (14) of a multi-cylinder internal combustion engine to a support portion (26).

Description

Methods for fastening high temperature articles to low temperature articles and arrangements for fastening high temperature articles to low temperature articles

The present invention relates to a method for fastening a first article to a second article according to the preamble of claim 1. The present invention also relates to an arrangement for fastening an exhaust module of an internal combustion engine to a support arranged in association with the internal combustion engine according to the preamble of claim 8. More specifically, the present invention discloses a method of fastening an exhaust module to a support in an internal combustion engine and an arrangement for fastening an exhaust module to a support in an internal combustion engine. The present invention also relates to a new exhaust module as well as an internal combustion engine and a new support.

The engine room of a marine vessel is generally kept as small as possible to save space for more beneficial use. It is therefore desirable to fit the engine and auxiliary devices, such as turbochargers, in a compact manner as possible. In a V-type engine, each bank of the engine often has its own turbocharger, so positioning the turbocharger may be problematic. Turbochargers generally used in connection with marine engines have turbine inlets in the radial direction so that the turbochargers are arranged such that their axes are in a plane perpendicular to the plane of the axis of the engine in order to simplify installation, The exhaust gas may be led from the engine bank to the exhaust inlet of the turbocharger by a straight exhaust manifold. This type of installation means that the turbocharger is positioned side by side with the shafts at the end of the engine across the vertical axis plane of the engine. However, since the combined axial length of the two turbochargers is greater than the width of the V-engine, the installation of such a turbocharger takes up additional space on the sides of the engine.

In order to solve the above-mentioned problems, an exhaust module is designed. The exhaust module is a device between the exhaust manifold arranged in the longitudinal direction of the engine and the turbine inlet of the turbocharger. By means of the exhaust module, the flow direction of the exhaust gas is turned in the transverse direction from the longitudinal direction of the engine so that the turbocharger may be positioned on the axis of the turbocharger parallel to the axis of the engine. Thus, by means of the exhaust module, the turbocharger may be fitted side by side within the width dimension of the V-type engine. The exhaust module is disclosed in more detail in WO-A2-2013 / 030445, which is incorporated herein by reference.

However, fixing the exhaust module to the support portion is mostly challenging due to the thermal expansion of the exhaust module itself, since the exhaust module operates with only high temperature exhaust gas. Naturally, an external load, such as thermal expansion of the member coupled to the exhaust module, is applied to the exhaust module, but this may be absorbed by the pipe joint of the flexible bellows type.

The thermal expansion of the exhaust module can, to a certain extent, be solved by fixing the exhaust module on the support by means of standard fastening bolts, whereby high stresses are exerted on all members of the connection, namely the exhaust module, fastening bolts, . This high stress, for example, is a risk of loosening of the exhaust module, which can lead to the destruction of one or more fastening bolts, thereby making it much easier to deteriorate due to vibration of the engine. Another way of considering the thermal expansion of the exhaust module is to leave the exhaust module in place to support the bellows-type pipe joints, but since this is designed so that the bellows-type pipe joints are virtually flexible and do not support any load, It is an impossible choice.

In this connection, it is an object of the present invention to provide an improved method of fastening an exhaust module of a multi-cylinder internal combustion engine in which cylinders are arranged in a V configuration, to a support.

Another object of the present invention is to provide an improved method of fastening an exhaust module on a support so that the exhaust module may be thermally freely inflated and that the exhaust module may still be securely fastened on the support.

It is yet another object of the present invention to provide an improved method of fastening an exhaust module on a support so that the free thermal expansion of the exhaust module is based on a sliding connection between the exhaust module and the support.

It is a further object of the present invention to provide an improved method of fastening an exhaust module on a support so that the arrangement used to fasten the exhaust module onto the support has a specific design that allows thermal movement of the exhaust module.

The object of the present invention can be substantially satisfied as set out in the independent claims and other claims which describe the different embodiments of the invention in more detail.

According to an embodiment of the present invention, the present invention relates to a method for fastening a first article onto a second article, wherein the first article is at a higher temperature than the second article, the first article comprises a plurality of feet, Each foot portion having a hole for a fastening bolt and a first surface facing the second article, the second article having threaded holes for the fastening bolt and a second surface facing the feet of the first article, Way

1. providing positioning means for positioning the first article on the second article to the first article and the second article,

2. Providing a low friction means between the feet and the second article,

3. mounting the first article on the second article such that the positioning means are aligned with each other, and

4. Tightening the fastening bolts so that the feet of the first article slide on the second surface with the aid of the low friction means while the first article is heated

.

According to an embodiment of the present invention, the present invention relates to an arrangement for fastening an exhaust module of an internal combustion engine to a support arranged in association with an internal combustion engine, the exhaust module having foot portions adapted to be seated on the support portion, The foot portions have holes for fastening bolts and bottom surfaces facing the support in use, the support having threaded holes for fastening bolts and support surfaces for facing the foot surfaces in use, A low friction surface is provided between all but at least one of the feet of the module.

According to an embodiment of the present invention, there is provided an exhaust module for a multi-cylinder internal combustion engine, wherein the cylinders are arranged in a V configuration in an internal combustion engine, the exhaust module comprising a first exhaust manifold of the internal combustion engine, A second exhaust duct for connecting the second exhaust manifold of the internal combustion engine to the turbine inlet of the second turbocharger and foot portions for fastening the exhaust module on the support portion, The foot portions have holes for fastening bolts and foot surfaces that, when in use, face the support, and all but at least one of the foot surfaces are machined or coated to have low friction characteristics.

According to an embodiment of the present invention, there is provided a support for an exhaust module for a multi-cylinder internal combustion engine, the cylinders being arranged in a V configuration in the internal combustion engine, the support having threaded holes for fastening bolts, Have surfaces around the threaded apertures and all but at least one of the surfaces around the threaded apertures are machined or coated to have a low friction characteristic.

In the following, the invention will be described in more detail with reference to the accompanying schematic drawings.

Figure 1 shows a prior art internal combustion engine according to WO-A2-2013 / 030445.
Figure 2 shows a prior art exhaust module according to WO-A2-2013 / 030445.
3 shows a partial cross section of a front view of an exhaust module-support combination according to a first preferred embodiment of the present invention.
Figure 4 shows a partial cross section of a front view of an exhaust module-support combination according to a second preferred embodiment of the present invention.
Figure 5 shows a top view of a partial view of a support according to a first preferred embodiment of the present invention.
Figure 6 shows a cross-sectional view of an arrangement for fastening an exhaust module onto a support.

Figure 1 shows a prior art internal combustion engine 2 in which the cylinders 4 are arranged in a V configuration, i.e. in two banks, a first bank 6 and a second bank 8. The exhaust gas of the first bank 6 and the second bank 8 is collected in the first exhaust manifold 10 and the second exhaust manifold 12. [ The first exhaust manifold 10 and the second exhaust manifold 12 are connected to the first exhaust manifold 10 and the second exhaust manifold 12 via the first turbocharger 16 and the second turbocharger 18 To exhaust module 14 (described in more detail in FIG. For example, the internal combustion engine may be the main or auxiliary engine of the ship, or it may be an engine used to generate electricity in the power plant.

Figure 2 illustrates an exemplary exhaust module 14 that may have improvements in accordance with various embodiments or variations of the present invention. The exhaust module 14 includes two exhaust ducts 20,22 integrated into the same module 14, i.e., a connection for an air bypass system and a connection for an exhaust waste gate system. Preferably, the exhaust module 14 is made as a single piece casting. For example, the material of the exhaust module 14 may be cast iron. The first exhaust duct 20 is provided for connecting the first exhaust manifold (10 in Fig. 1) of the first bank of the engine to the first turbocharger. The second exhaust duct 22 is provided for connecting the second exhaust manifold (12 in Fig. 1) of the second bank of the engine to the second turbocharger. The first exhaust duct 20 traverses the second exhaust duct 22 and both ducts 20 and 22 are integrally connected to the connections for air bypass and exhaust waste gate. The exhaust module 14 may be located at one end of the engine (as shown in FIG. 1), and may be supported by a number of (generally four) foot portions 24, (Shown in Figs. 3, 4 and 5).

The first exhaust duct 20 of the exhaust module 14 is arranged to receive the hot exhaust gas from the first exhaust manifold through an inlet 20a. The inlet 20a may be connected to the first exhaust manifold via an intermediate duct, such as a bellows type duct section or directly. The second exhaust duct 22 of the exhaust module 14 is arranged to receive the hot exhaust gas from the second exhaust manifold through an inlet 22a. The inlet 22a may be connected to the second exhaust manifold via an intermediate duct, such as a bellows type duct section or directly. The other end of the first exhaust duct 20 is arranged to introduce the hot exhaust gas through the outlet 20b into the turbine of the first turbocharger. The other end of the second exhaust duct 22 is arranged to introduce the hot exhaust gas through the outlet 22b into the turbine of the second turbocharger. In the horizontal plane, the outlet 20b of the first exhaust duct 20 is preferably at an angle of 70 to 110 degrees with respect to the inlet 20a of the first exhaust duct 20, The outlet 22b is preferably at an angle of 70 to 110 degrees relative to the inlet 22a of the second exhaust duct 22.

The problem to be solved by the present invention is the fact that since the hot exhaust gas passes through the exhaust module, the exhaust module operates at a high temperature and its temperature may rise from 550 to 600 DEG C in the upper part and from 300 to 350 DEG C in the lower part And the exhaust module must be fastened to a support that is not subjected to a correspondingly high temperature in any case but is very realistically close to the engine block temperature of 80 to 90 DEG C so that the difference in the thermal expansion of the two components, That is, fastening the hot article to the support, i. E., The cold article, must be considered in more detail to avoid the stresses exerted on the two elements. It should be understood that the temperature of the exhaust gas varies in direct proportion to the load, and therefore the thermal expansion of the exhaust gas changes in direct proportion to the engine load, as the engine may be operated under different load conditions.

3 is a partial cross-sectional view of a front view of the exhaust module-support combination (i.e., hot article-cold article combination) of the first preferred embodiment of the present invention from the direction in which hot exhaust gases enter the inlet of the exhaust duct. The feet 24 of the exhaust module 14 are seated on suitable supports 26, which are preferably, but not necessarily, turbocharger baskets. According to a first preferred embodiment of the present invention, the support portion 26 is a planar member having a surface 28 that is arranged to seat the foot portions 24 of the exhaust module 14. Foots 24 have holes 30 (shown here by a centerline) for fastening bolts (shown and described in more detail in FIG. 6). The support 26 includes threaded holes (see FIG. 6) for fastening bolts and first means 32 for positioning the exhaust module on the support 25 (hereinafter referred to as "first positioning means" In which the first positioning means extends upwardly from the surface 28 of the support portion 26 and is preferably but not necessarily of such a cross-section, in this variation of the first preferred embodiment of the present invention, In the middle of the threaded holes. In order to cooperate with the first positioning means 32, there is a second means 34 (hereinafter referred to as " second positioning means ") for positioning the exhaust module on the support 26, Is provided in a projection 36 extending to the bottom of the exhaust module 14 and preferably to the level of these surfaces 38 of the feet 24 that are seated on the surface 28 of the support 26, Sectional shape of the first positioning means. According to a further variant of the first preferred embodiment of the invention, the first positioning means is a blind opening in the surface 28 of the support 26, whereby the second positioning means comprises a first positioning means Shaped member having a cross-sectional shape matched with that of the exhaust module and extending from a protrusion arranged at the bottom of the exhaust module. According to a further alternative variant of the first preferred embodiment of the present invention, the first positioning means is a blind opening in the surface 28 of the support 26, whereby the second positioning means comprises a first position (Without protrusions) having a cross-sectional shape matched to that of the determining means and also from the bottom of the exhaust module.

The purpose of the first and second positioning means 32 and 34 is to prevent unexpected movement and sliding of the exhaust module due to thermal expansion and external load. That is, their purpose is, according to the present invention, to determine whether the thermal expansion of the exhaust module 14 is away from the positioning means or in a predetermined direction toward the positioning means, depending on the direction of temperature change of the exhaust module 14. [ Is to maintain the overall position of the exhaust module 14 on the support 26 and relative to the support to slide the feet 24 of the support 14 over the surface 28 of the support 26.

It is troublesome to slide the exhaust module 14 on the support portion 26 because both the exhaust module 14 and the support portion 26 are made of cast iron in general. In this environment, the coefficient of friction between the two machine elements is about 0.5, which is substantially the same as that of the fastening bolts (not shown) to allow any sliding movement between the supports 26 and the surfaces 38 of the feet 24. [ Which means that it must remain fairly loose. When tightened with a higher torque, the bolts tightly press the high friction surfaces of the support and the exhaust module together tightly so that the surfaces can not slide at all and the exhaust module, especially both its feet and support, can be subjected to considerable stress . In order to be able to tighten the fastening bolts with sufficient torque to securely engage and still allow the counter surfaces 38 and 28 of the exhaust module and support to slide relative to each other, . There are a number of ways in which the friction characteristics between the surfaces may be reduced, i.e., at least one of the counter surfaces is provided to have low friction characteristics such that the coefficient of friction between the counter surfaces is less than 0.2.

1. Machining at least one of the support surfaces and the counter surfaces of the exhaust module to have a low friction surface.

2. Providing a low friction surface on at least one of the counter surfaces of the support and the exhaust module. For applicable low friction coatings, a variety of metal and ceramic materials may be used. For example, the selective treatment is to treat the surface with manganese phosphate (Fe / Mnph / g / 5 / T4 according to EN-12476).

3. At least one shim is to provide at least one low friction surface between the support and the counter surfaces of the exhaust module. At least one shim may be made of, or coated with, a material having a suitable low friction surface. The preferred options for seam materials are stainless steel and ceramics. The thickness of the padding is about 2 to 10 mm. According to an exemplary embodiment, a standard AISI 304 steel sheet (according to EN 10028) that is cold rolled to have a light surface and a hardness of ~ 170 HV1 is used. However, the deliberate mechanical properties are less relevant due to the lower contact pressure. The main reason for lowering friction is to avoid contact of two identical materials, because they have a higher coefficient of friction than two different materials.

4. To provide a low friction surface with hardness greater than cast iron to prevent irregular surfaces of the counter surface through low friction surfaces.

With respect to the low friction surfaces, the tests performed showed that a coefficient of friction on the order of 0.2 or less is sufficient to allow relative movement between the counter surfaces and a sufficiently high tightening torque for the fastening bolts.

4 is a partial cross-sectional view of a front view of the exhaust module-support combination (i.e., hot article-cold article combination) of the second preferred embodiment of the present invention from the direction in which the hot exhaust gases enter the inlets of the exhaust ducts do. The feet 24 of the exhaust module 14 are seated on a suitable support 26 which is preferably but not necessarily a turbocharger bracket. According to a second preferred embodiment of the present invention, the support 26 is provided with projections raised above the planar surface 28 to simplify and reduce possible machining operations (not necessarily machining the entire upper surface of the support) With the beds 40 arranged so that the feet 24 of the exhaust module 14 are seated against the surfaces 42 of the beds 40. [ The foot portions 24 have holes 30 (here indicated by a center line) for fastening bolts (shown and described in more detail in FIG. 6), and beds 40 (supports) (Shown in Fig. 6). In addition to the beds 40 and the threaded apertures, the support 26 comprises a protrusion or bed 44 for the first positioning means 32, In the example, it is a pin-like member that extends upwardly from the surface of the projection or bed 44 and is preferably, but not necessarily, arranged midway between the threaded holes in this cross-section Described). It extends to the level of these surfaces 38 of the foot portions that rest against the bottom surface of the exhaust module 14 and preferably against the bed surfaces 42 of the support portion 26 with respect to the first positioning means 32 There is a second positioning means 34, that is, a blind opening, having a cross-sectional shape matched to that of the first positioning means 32, provided in the projection 36. [ According to another variant of the invention, the first positioning means is a blind opening in the surface of the support portion 26, whereby the second positioning means has a cross-sectional shape mating with that of the first positioning means, And is a pin-shaped member extending from a protrusion arranged on the bottom of the module. According to a further variant of the invention, the first positioning means is a blind opening in the surface of the support portion 26, and the second positioning means has a cross-sectional shape mating with that of the first positioning means, (Without projections) from the bottom of the module.

Figure 5 shows a partial cross-section of the support portion 26 from above showing both the first positioning means 32 and the four threaded holes 46 for the fastening bolts. According to Fig. 5, the positioning means 32 is located at a point where the diagonal lines of the rectangles drawn through the centers of the threaded holes 46 intersect each other. Since the positioning means maintains the exhaust module and the support in place, regardless of the thermal cycle, this is an optional position for the positioning means and since the first positioning means 32 is at the center of the threaded portion 42 , The effect of thermal expansion of the exhaust module is the same in each threaded hole 46 so that each foot of the exhaust module is moved away from the first positioning means 32 or towards the first positioning means 32 Move the same distance. This type of arrangement is best in terms of the stresses exerted on the members of the fastening arrangement, but the positioning means may be located at any suitable position between the exhaust module and the support, if such stresses need not be taken into consideration.

The option is to use one of the fastening bolts and a threaded hole in the support to which the fastening bolt is screwed as the first positioning means and a hole in the foot as the second positioning means. The hole serving as the second positioning means has a smaller diameter than the rest of the foot. When the hole functions as the second positioning means, its diameter is preferably, but not necessarily, matched to that of the fastening bolt functioning as the first positioning means. When one of the fastening bolts functions as the first positioning means, the bolt may be shorter than the rest of the fastening bolts, because the bolts are bent and there is no need to allow any lateral movement. When one of the fastening bolts is used as the first positioning means, at least the foot surfaces 38 (see FIG. 3) and / or the counter surfaces 40 on the support 26 are spaced from the positioning means, And has a low friction characteristic for allowing sliding on the support portion. Therefore, it is necessary to machine or coat all but the at least one of the foot surfaces and / or its counter surfaces to have a suitable low friction characteristic between the exhaust module and the support. Naturally, it is also possible for the foot surface and / or the counter surface on the support to be coated or machined around the immediate positioning means, although there is no substantial clearance between the surfaces.

Reference numeral 40, which represents the area defined by the brooklyn circle, is machined relative to the support surface 28 to allow the foot to more easily slide on the support 28, in the case of the first preferred embodiment of Fig. Or a coated low friction surface, or in the case of the second preferred embodiment of Figure 4, raised projections or beds from the surface 28 of the support 26 and / or machining on the bed and / Is considered to represent a coated low friction surface. Reference numeral 44, representing another additional brooklyn circle, may be considered to represent raised ridges or beds from the surface 28 of the support 26 for the first positioning means 32 as shown also in Fig. have.

Figure 6 shows the fastening arrangement used to attach the exhaust module 14 onto the support 26. The same principle may be applied to the first and second embodiments of the present invention. According to Fig. 6, in order to fasten the exhaust module 14 on the support 26, firstly the fastening bolt 48 has a lengthy sleeve 50 and secondly (the exhaust module is provided on the support The bolts are positioned on the toes of the exhaust module 14 after the positioning means are aligned with each other and the holes 30 in the foot 24 are aligned with the threaded apertures 46 in the support 26. [ The bolts 48 are threaded in the threaded blind holes 46 in the support 26 (in the bed of the support or in the plane support) But is also tightened to a predetermined torque such that the foot 24 of the module 14 may slide along the surface 28 or 40 of the support 26.

Another option for fastening the exhaust module onto the support is a set of headless bolts that are first threaded within the threaded blind holes 46 in the support 26. In this case, the shims 54 may be inserted next to the bolts, if necessary, and then the exhaust module is installed around the tongue bolts with the feet, then the sleeves are inserted into the bolts, Finally, the nuts are threaded onto the threaded ends of the tundish bolts downwardly with respect to the sleeves. In this case, the positioning means will be more or less automatically matched.

Regarding the bolts used to fasten the exhaust module on the support, according to the embodiment, 8.8 Grade of bolts are used. The bolts are tightened with an intermediate force such that the tensile stress on the bolt sections having the smallest diameter is approximately one-half of the yield stress. This stress level results in that the exhaust module is fixed to a suitable stability against sliding due to the longitudinal force and there is a sufficient safety margin in terms of the bending stress applied to the bolt by the thermal displacement. With respect to the sleeves, they may be made of standard (S355) steel, for example because their cross-sectional area is greater than that of the bolts and therefore they do not receive any specific stress.

Fig. 6 shows a dashed line of the insulation cap 56 provided on the bolt to insulate the sleeve and bolt from the high temperature environment of the exhaust area to prevent degradation of material properties. 6 also shows that the diameter d of the enlarged section of the bolt 48, or preferably but not necessarily, is less than D of the hole 30 in the foot 24. By arranging the gap between the bolt and the wall of the hole equal to (Dd) / 2 larger than the maximum thermal expansion at the distance of the hole 30 from the positioning means, the hole wall and the bolt do not come into contact with each other, 24 are also able to slide along the surface 28 or 40 of the support 26. That is, the gap absorbs thermal expansion. In any case, since there is a relative movement between the hole 30 and the bolt 48, the bolt 48 is apparently longer than is necessary in conventional bolting. The bolt 48 has a sleeve 50 that extends between the head 52 of the bolt 48 and the foot 24 and urges the foot 24 against the support 26. By arranging the sleeve 50 in the bolt 48 the length of the bolt is increased so that the relative movement between the bolt 48 and the foot 24 spreads over the length of the bolt 48, Because there is a head 52 of the bolt 48 that is moved by the sleeve 50 supported on it and therefore tends to move with it. This relative movement is thus absorbed by the bolt 48 and possibly by slight bending by the sleeve 50. Preferably, but not necessarily at a distance of about half the length of the sleeve as measured from the bolt head, the bolt has an enlarged cross-section of the diameter corresponding to the inner diameter of the sleeve. This design is forced to bend the bolt and sleeve together. The longer the bolts and sleeves, the less the need for the bolts or bolts and sleeves to bend to allow a certain amount of movement at the foot.

Figure 6 also shows the padding 54 between the foot 24 and the support 26. As already mentioned above, the shim has at least one low friction surface such that the surface facing the low friction surface of the shim easily slides along the seam surface. Shim may be made of stainless steel or ceramics whose frictional properties are good for low friction purposes. The other option is to stack the two shims over one another, thereby causing them to slide against each other.

As a further embodiment of the invention, an optional configuration for the sleeve may be mentioned. The sleeve may be replaced by a vertical hollow extension of the foot having a height corresponding to the height of the sleeve. Such an extension may be a single part of the exhaust module casting or a welded sleeve-like element fastened on the foot, for example. The diameter of the extension is somewhat longer than the diameter of the bolt, so that the bolt may be bent inside the extension.

It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above but may be varied within the scope of the appended claims.

Claims (26)

A method of fastening a first article (14) onto a second article (26)
The first article 14 is at a higher temperature than the second article 26 and the first article 14 has a plurality of toes 24, (30) and a first surface (38) facing the second article (26), the second article (26) having threaded holes (46) for the fastening bolts (48) And second surfaces (28) facing the feet (24) of the first article (14), the method
a) providing positioning means for positioning the first article (14) on the second article (26) to the first article (14) and the second article (26)
b) providing a low friction means (54) between said feet (24) and said second article (26)
c) mounting said first article (14) on said second article (26) such that said positioning means are aligned with each other,
d) the fastening bolts (24) are slid so that the feet (24) of the first article (14) slide on the second surfaces (28) with the aid of the low friction means while the first article (Step < RTI ID = 0.0 >
(14) on the second article (26). The method according to claim 1,
After step c)
i. Inserting the fastening bolts (48) into the holes (30) in the feet (24), and
ii. Screwing the fastening bolts 48 into the threaded holes 46 in the second article 26
(14) is fastened on the second article (26). The method according to claim 1,
Before step c)
i. Inserting the fastening bolts into the threaded holes (46) in the second article (26), and
ii. Screwing the fastening bolts into the threaded holes 46 so that the fastening bolts become headless bolts
(14) is fastened on the second article (26). The method according to claim 2 or 3,
Step i. A method for fastening a first article (14) on a second article (26), the method comprising inserting a sleeve (50) into each fastening bolt (48). The method according to claim 1,
(54) between the feet (24) of the first article (14) and the second article (26), at least one low friction surface Wherein the first article (14) is fastened on the second article (26). The method according to claim 1,
Characterized in that in step b) machining or coating of at least one of the first surface (38) and the second surface (28) to lower the friction characteristics. A method for fastening on a second article (26). The method according to claim 1,
Characterized in that the first article is an exhaust module and the second article is a support part (26) for the exhaust module (14). An arrangement for fastening an exhaust module of an internal combustion engine to a support arranged in association with the internal combustion engine,
The exhaust module 14 has feet 24 adapted to rest on the support 26 and the feet 24 are provided with holes 30 for the fastening bolts 48, The support portion 26 includes threaded apertures 46 for the fastening bolts 48 and a plurality of threaded surfaces 38 for use on the foot surfaces 38 (28) facing each other,
Wherein a low friction surface is provided between the support (26) and all but the at least one of the feet (24) of the exhaust module (14). 9. The method of claim 8,
Characterized in that the low friction surface is a machined or coated foot surface (38) and / or a machined or coated support surface (28). 9. The method of claim 8,
A shim 54 is arranged between all but the at least one of the feet 24 of the exhaust module 14 and the support 26 and the shim 54 is provided with the low friction surface ≪ / RTI > 11. The method according to any one of claims 8 to 10,
Characterized in that the support part (26) comprises a first positioning means (32), the exhaust module (14) comprises a second positioning means (34) and the exhaust module (14) Characterized in that the first positioning means (32) and the second positioning means (34) are matched with each other when installed in the housing. 12. The method of claim 11,
Characterized in that the first positioning means is a pin member (32) or a blind opening. 12. The method of claim 11,
Characterized in that said second positioning means is a pin-like member or blind opening (34). 12. The method of claim 11,
Wherein the first positioning means is one of fastening bolts threaded into one of the threaded holes (46) and the second positioning means is a hole in one of the feet (24) Characterized in that the arrangement. 15. The method according to any one of claims 8 to 14,
All but the at least one of the fastening bolts 48 have a diameter smaller than the diameter of the holes 30 in the foot portions 24 and thus are located between the fastening bolt 48 and the hole 30 Wherein a gap remains, the gap absorbing thermal expansion of the exhaust module (14). 16. The method according to any one of claims 8 to 15,
All except for at least one of the fastening bolts 48 are formed in a sleeve (not shown) that is positioned on the foot 24 when the fastening bolt 48 is installed in the hole 30 in the foot 24 50). ≪ / RTI > 16. The method according to any one of claims 8 to 15,
All but the at least one of the fastening bolts 48 includes a sleeve 50 that is positioned on the foot 24 after the exhaust module 14 is mounted on the support 26 ≪ / RTI > An exhaust module (14) for a multi-cylinder internal combustion engine (2)
The cylinders 4 are arranged in a V configuration in the internal combustion engine 2 and the exhaust module 14 is connected to the first exhaust manifold 10 of the internal combustion engine 2 by the first turbocharger 16 A second exhaust duct 22 for connecting the second exhaust manifold 12 of the internal combustion engine 2 to the turbine inlet of the second turbocharger 18, And foot portions 24 for fastening the exhaust module 14 on the support portion 26. The foot portions 24 include holes 30 for fastening bolts 48, And foot surfaces (38) facing the support (26) in use,
Wherein all but the at least one of the foot surfaces (38) are machined or coated to have a low friction characteristic. 19. The method of claim 18,
Characterized in that the exhaust module (14) comprises positioning means (34) for defining the position of the exhaust module (14) on the support part (26). 20. The method of claim 19,
Characterized in that the positioning means (34) is a pin-like member or a blind opening. 20. The method of claim 19,
Characterized in that said positioning means (34) is a hole in one of said feet (24). A support for an exhaust module (14) for a multi-cylinder internal combustion engine (2)
The cylinders 4 are arranged in a V configuration in the internal combustion engine 2 and the support portion 14 has threaded holes 46 for fastening bolts,
The support portion 26 has surfaces around the threaded apertures 46 and all except at least one of the surfaces 40 around the threaded apertures 46 are machined Or coated. 23. The method of claim 22,
Characterized in that the support part (26) comprises, in use, first positioning means (32) for defining the position of the exhaust module (14) on the support part (26). 24. The method of claim 23,
Wherein the first positioning means is a pin-like member or a blind opening. 24. The method of claim 23,
Characterized in that said first positioning means is one of said threaded holes (46). A plurality of cylinders 4 arranged in the first bank 6 and the second bank 8,
A first exhaust manifold 10 for accommodating the exhaust gas from the cylinders 4 of the first bank 6,
A second exhaust manifold 12 for receiving exhaust gas from the cylinders of the second bank 8,
A first turbocharger (16) operative with respect to the exhaust gas from the cylinders (4) of the first bank (6) of the internal combustion engine (2), and
A second turbocharger (18) operated on exhaust gas from the cylinders of the second bank (8) of the internal combustion engine (2)
1. An internal combustion engine (2) comprising:
The internal combustion engine (2) comprises an arrangement according to any one of claims 8 to 17, an exhaust module (14) according to any one of claims 18 to 20, and any one of claims 21 to 25 Characterized in that it comprises at least one of the supports (26) according to any one of the preceding claims.

Images