KR102134108B1 - Method for fastening a high temperature article to a low temperature article and arrangement for fastening a high temperature article to a low temperature article - Google Patents

Abstract

The present invention provides mechanical stress caused by thermal expansion of the exhaust module against the support 26 and the feet 24 by arranging the feet 24 of the exhaust module 14 to slide on the support surface 28. It relates to a method and means for fastening the exhaust module (14) of a multi-cylinder internal combustion engine to a support (26) to avoid.

Description

Method for fastening a high temperature article to a low temperature article and arrangement for fastening a high temperature article to a low temperature article

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 the exhaust module of an internal combustion engine to a support arranged in relation to the internal combustion engine according to the preamble of claim 8. More specifically, the present invention discloses a method for fastening an exhaust module to a support in an internal combustion engine and an arrangement for fastening the exhaust module to a support in an internal combustion engine. The invention also relates to new exhaust modules and new supports as well as internal combustion engines.

Marine vessel engine rooms are generally kept as small as possible to save space for more beneficial use. It is therefore desirable to fit engines and auxiliary devices, such as turbochargers, in as compact a way as possible. In a V-type engine, each bank of the engine often has its own turbocharger, so the positioning of the turbocharger may be problematic. Turbochargers commonly used in connection with marine engines have turbine inlets in the radial direction, so that for simplicity of installation the turbochargers are arranged such that their axis is in a plane perpendicular to the plane of the engine's axis, thereby As a result, the exhaust gas may lead from the engine bank to the exhaust inlet of the turbocharger by a straight exhaust manifold. This kind 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 this turbocharger takes up additional space on the sides of the engine.

In order to solve the above-mentioned problem, an exhaust module was 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 transversely from the engine's longitudinal direction so that the turbocharger may be positioned on the axis of the turbocharger parallel to the engine's axis. Thus, with 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 corresponds to EP-A1-2751407, incorporated herein by reference.

However, since the exhaust module operates only with high temperature exhaust gas, fixing the exhaust module to the support is most challenging due to the thermal expansion of the exhaust module itself. Naturally, an external load, such as thermal expansion of a member coupled to the exhaust module, is applied to the exhaust module, but this may be absorbed by a flexible bellows type pipe joint.
US-B1-6789386 discloses an exhaust gas manifold for mounting on the cylinder head of an internal combustion engine, said exhaust gas manifold consisting of at least one cylinder support having a bore for discharging exhaust gas. The exhaust gas manifold includes an exhaust gas manifold collector housing for collecting exhaust gas from the cylinder head, and a sealing device disposed between the exhaust gas collector housing and the cylinder head. The exhaust gas manifold collector housing has a recess, which can be directly connected to the cylinder head through a fixing mechanism, whereby the influence of heat can move between the exhaust gas manifold collector housing and the cylinder head.
JP-A-H08 246868 forms a clearance between the stud bolt and the collar main body to taper the inside of the cylindrical installation collar in order to suppress the thermal expansion/contraction of the cylindrical installation collar between the inner peripheral surface of the collar main body and the collar nut sheet. It is disclosed to improve the insertion workability of the stud bolt by forming a corner square part. The mounting collar consists of a collar main body and a collar nut seat, and further suppresses thermal expansion/contraction of the mounting collar by arranging clearance between the stud bolt and the collar main body. In this case, the end part on the collar nut seat side of the collar main body, i.e., the corner square part between the inner circumferential surface of the collar main body and the collar nut seat, is formed of a truncated conical tapered surface whose inner diameter decreases as it progresses toward the collar nut seat And is also formed as a stud bolt guide. Therefore, when the installation collar is installed on the stud bolt, the insertion guide of the installation collar to the stud bolt is flattened, and the insertion workability is also improved.
US-A1-2014053918 discloses a mounting foot for mounting post-processing parts on a frame. The mounting foot may be provided with a pad connectable to the frame. The mounting foot may also include a slider slidably connected to the pad. Further, the mounting foot may be provided with a mounting bracket. The mounting bracket may have a first end connectable to a post-processing component and a second end connected to a slider.
DE-A1-19920822 uses an oversize hole in the manifold, a stud fastener extending through the oversize hole, a spacer element around the stud fastener, and a nut adjusted to tighten to engage the flange and spacer elements. Disclosed is an apparatus and method for attaching an exhaust manifold to an engine's cylinder head, wherein the flat gasket is compressed to a desired degree that is not too excessive to inhibit sliding movement caused by thermal growth of the manifold.
EP-A1-1450018 discloses a fixation system for securing an exhaust manifold to an internal combustion engine, the fixation system comprising a bolt having a first end for fixing to the engine, and a sleeve having an inner diameter larger than the outer diameter of the bolt It includes. The first end of the sleeve is supported on the flange of the exhaust manifold, and the second end of the sleeve is supported on the joint attached to the second end of the bolt. The coefficient of thermal expansion of the material of the bolt is greater than that of the material of the sleeve. (1) an internal combustion engine arrangement comprising an exhaust manifold fixed to an internal combustion engine using the stationary system; And (2) independent claims for the process for securing the exhaust manifold to the internal combustion engine.

Thermal expansion of the exhaust module can, to a certain extent, be solved by fixing the exhaust module on the support by standard fastening bolts, thereby high stress on all members of the connection, ie the exhaust module, fastening bolts and support. Will apply This high stress, for example, can lead to the destruction of one or more fastening bolts, and there is a risk of looseness of the exhaust module, which can easily be made even worse due to vibration of the engine. Another way to consider the thermal expansion of the exhaust module is to leave the exhaust module in place to support the bellows type pipe joint, but this is actually because the bellows type pipe joints are virtually flexible and designed to support no load. It is an impossible choice.

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

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

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

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

The object of the present invention can be substantially met as disclosed in the independent claims and other claims, which describe different embodiments of the invention in more detail.

According to an embodiment of the invention, the present invention relates to a method for fastening an exhaust module of an internal combustion engine on a support arranged in relation to the internal combustion engine, wherein the exhaust module is at a temperature higher than the support, and the exhaust module Is provided with a plurality of foot portions, each foot having a hole for a fastening bolt and a first surface facing the support portion, the support portion having a threaded hole for the fastening bolts and the foot portions of the exhaust module 2 with surfaces, the method

1. providing a first positioning means, which is one of the fin-shaped member and a blind opening, to a support, and providing a second positioning means, which is one of the blind opening and a pin-shaped member, to the exhaust module,

2. providing a low friction means between the feet and the support,

3. mounting the exhaust module on the support so that the positioning means match each other, and

4. While the exhaust module is heating, tightening the fastening bolts so that the feet of the exhaust module can slide on the second surfaces with the aid of low friction means.

It includes.

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 portion arranged in relation to an internal combustion engine, the exhaust module having foot portions adapted to rest on the support portion, Each foot has a hole for the fastening bolt and a bottom surface facing the support in use, and the support has threaded holes for the fastening bolts and support surfaces facing the foot surfaces in use, the support and exhaust modules A low friction surface is provided between all but at least one of the foot portions of the body, the support portion has a first positioning means, the exhaust module has a second positioning means, the first positioning means and The second positioning means are mated to each other when the exhaust module is installed on the support, the first positioning means is one of a pin-shaped member and a blind opening, and the second positioning means is a blind opening and a pin-shaped member Is one of the.

According to an embodiment of the present invention, the present invention relates to an exhaust module for a multi-cylinder internal combustion engine, wherein the cylinders are arranged in a V configuration in the internal combustion engine, and the exhaust module replaces the first exhaust manifold of the internal combustion engine with the turbine of the first turbocharger. A first exhaust duct for connecting to the inlet, 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, The feet have holes for fastening bolts, and foot surfaces facing the support in use, and all but at least one of the foot surfaces are machined or coated to have low friction properties.

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

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

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

1 shows a prior art internal combustion engine 2 in which the cylinders 4 are of V configuration, ie arranged in two banks, the first bank 6 and the 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 include a first exhaust manifold 10 and a second exhaust manifold 12, the first turbocharger 16 and the second turbocharger 18 ) Is used to move the exhaust gas to the exhaust module 14 (described in more detail in FIG. 2) used for connection. For example, the internal combustion engine may be a ship's main or auxiliary engine, or it may be an engine used to generate electricity in a power plant.

2 shows an exemplary exhaust module 14 that may have improvements in accordance with various embodiments or variations of the present invention. The exhaust module 14 comprises two exhaust ducts 20, 22 integrated into the same module 14, ie a connection for the air bypass system and a connection for the 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 with a connection for air bypass and exhaust waste gates. The exhaust module 14 may be located at one end of the engine (as shown in FIG. 1 ), for example by a plurality of (generally four) feet 24 suitable supports, such as a turbocharger bracket (Shown in FIGS. 3, 4 and 5).

The first exhaust duct 20 of the exhaust module 14 is arranged to receive hot exhaust gas from the first exhaust manifold through the inlet 20a. The inlet 20a may be connected to the first exhaust manifold through 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 hot exhaust gas from the second exhaust manifold through the inlet 22a. The inlet 22a may be connected to the second exhaust manifold directly or through an intermediate duct, such as a bellows-type duct section. The other end of the first exhaust duct 20 is arranged to introduce 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 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, and of the second exhaust duct 22 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 due to the fact that since the high temperature exhaust gas passes through the exhaust module, the exhaust module operates at a high temperature, and its temperature may be increased to 550 to 600°C at the top and 300 to 350°C at the bottom. In addition, since the exhaust module must be fastened to a support that is not subject to a corresponding high temperature in any case, but very realistically close to the engine block temperature of 80 to 90°C, the difference in thermal expansion of the two elements is the exhaust module, That is, fastening the hot article to the support, i.e. the cold article, requires that it be considered in more detail in order to avoid stress applied to the two elements. It should be understood that the temperature of the exhaust gas fluctuates in direct proportion to the load, as the engine may operate under different load conditions, whereby the thermal expansion of the exhaust gas changes in direct proportion to the engine load.

3 is shown as a partial cross-section of the front view of the exhaust module-supporting combination (ie, hot article-cold article combination) of the first preferred embodiment of the present invention from the direction in which the hot exhaust gas enters the inlet of the exhaust duct. The feet 24 of the exhaust module 14 rest on a suitable support 26, which is preferably but not necessarily a turbocharger basket. According to a first preferred embodiment of the invention, the support 26 is a planar member having a surface 28 arranged so that the feet 24 of the exhaust module 14 are seated. The feet 24 have holes 30 (shown by the centerline here) for fastening bolts (shown and described in more detail in FIG. 6 ). The support 26 is the first means 32 for locating the threaded holes for fastening bolts (shown in FIG. 6) and the exhaust module on the support 25 (hereinafter referred to as'first positioning means') And the first positioning means, in this variant of the first preferred embodiment of the invention, extends upwardly from the surface 28 of the support 26 and also preferably but not necessarily this cross section. It is a pin-shaped member arranged in the middle between the threaded holes. In order to cooperate with the first positioning means 32, there is a second means 34 for locating the exhaust module on the support 26 (hereinafter referred to as'second positioning means'), ie blind opening Is provided in the bottom of the exhaust module 14, preferably in a projection 36 extending to the level of these surfaces 38 of the foots 24 seated on the surface 28 of the support 26, It is matched with the cross-sectional shape of the first positioning means. According to another variant of the first preferred embodiment of the present invention, the first positioning means is a blind opening on the surface 28 of the support 26, whereby the second positioning means is the first positioning means It is a pin-shaped member having a cross-sectional shape that matches that of and also extending from a protrusion arranged at the bottom of the exhaust module. According to a further variant of the first preferred embodiment of the present invention, the first positioning means is a blind opening on the surface 28 of the support 26, whereby the second positioning means is located in the first position It is a pin-shaped member having a cross-sectional shape matching that of the determining means and extending (without protrusions) from the bottom of the exhaust module.

The purpose of the first positioning means and the second positioning means 32 and 34 is to prevent unexpected movement and sliding of the exhaust module due to thermal expansion and external loads. That is, their purpose is, in accordance with the present invention, depending on the direction of temperature change of the exhaust module 14, the thermal expansion of the exhaust module 14 away from the positioning means or in the predetermined direction toward the positioning means exhaust module It is to maintain the overall position of the exhaust module 14 on and in relation to the support 26 so as to slide the foots 24 of the support 14 off the surface 28 of the support 26.

When the configuration of the prior art is used, it is cumbersome to slide the exhaust module 14 on the support 26 because both the exhaust module 14 and the support 26 are generally made of cast iron. In this environment, the coefficient of friction between the two mechanical elements is on the order of 0.5, which substantially tightens the bolts to allow any sliding movement between the supports 26 and the surfaces 38 of the feet 24. This means that it should remain fairly loose. When tightened to a higher torque, the bolts tightly press the high friction surfaces of the support and exhaust modules together, so that the surfaces cannot 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 a torque sufficient to reliably fasten, and still allow counter surfaces 38 and 28 of the exhaust module and support to slide relative to each other, the coefficient of friction between the surfaces is reduced. Should be. There are several ways in which the friction properties between surfaces may be reduced, ie at least one of the counter surfaces is provided with low friction properties such that the coefficient of friction between the counter surfaces is less than or equal to 0.2.

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

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

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

4. In order to prevent the irregular surface of the counter surface from penetrating the low friction surface, the hardness of cast iron or more is provided on the low friction surface.

With regard to low friction surfaces, the tests performed showed that a coefficient of friction of less than 0.2 was sufficient to allow a relative movement between counter surfaces and a sufficiently high tightening torque for the fastening bolts.

4 is a partial cross-sectional view of the front view of the exhaust module-support combination (ie, hot article-cold article combination) of the second preferred embodiment of the present invention from the direction in which the hot exhaust gas enters 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 the 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 (no need to machine the entire upper surface of the support) or With the beds 40, the feet 24 of the exhaust module 14 are arranged to rest on the surfaces 42 of the beds 40. The foots 24 have holes 30 (shown by the centerline herein) for fastening bolts (shown and described in more detail in FIG. 6 ), and the beds 40 (support) are fastening bolts It is equipped with threaded holes (shown in FIG. 6) for the field. In addition to the beds 40 and the threaded holes, the support 26 is provided with a projection or bed 44 for the first positioning means 32, said first positioning means being such a variant of the invention. In the example, it is a pin-shaped member that extends upward from the surface of the projection or bed 44 and is also preferably but not necessarily arranged in the middle between the threaded holes in this cross section (the positioning means is described in more detail in FIG. 5 ). Explained). With respect to the first positioning means 32, the bottom of the exhaust module 14, preferably extending to the level of these surfaces 38 of the foot rests on the bed surfaces 42 of the support 26 There is a second positioning means 34, ie a blind opening, provided in the projection 36 having a cross-sectional shape that matches that of the first positioning means 32. According to another variant of the invention, the first positioning means is a blind opening in the surface of the support 26, so that the second positioning means has a cross-sectional shape that matches that of the first positioning means and is also exhausted. It is a pin-shaped member extending from a protrusion arranged at 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 26, and the second positioning means has a cross-sectional shape to match that of the first positioning means and is also exhausted. It is a pin-shaped member extending from the bottom of the module (without protrusions).

FIG. 5 shows a partial cross section of the support 26 from above showing all of the first threading means 32 and the four threaded holes 46 for fastening bolts. According to FIG. 5, the positioning means 32 are positioned at the point where the diagonals of the rectangle drawn through the center of the threaded holes 46 intersect each other. Since the positioning means keeps the exhaust module and the support in place regardless of the heat cycle, this is an optional position for the positioning means, and also because the first positioning means 32 are in the center of the threaded arrangement 42 , The effect of the thermal expansion of the exhaust module is the same in each threaded hole 46, whereby 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 kind of arrangement is best in terms of the stress applied to the members of the fastening arrangement, but if it is not necessary to take this stress into account, the positioning means may be located at any suitable location between the exhaust module and the support.

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 preferably but not necessarily matches that of the fastening bolt which functions 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, since the bolt is bent and does not 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 apart from the positioning means so that the feet It has low friction properties to allow slipping on the support. Therefore, it is necessary to machine or coat all but the at least one of the foot surfaces and/or their counter surfaces to have suitable low friction properties between the exhaust module and the support. Naturally, it is also possible that the surface of the foot and/or the counter surface on the support is coated or machined just around the positioning means, although there is actually no apparent sliding between the surfaces.

Reference numeral 40, which represents the area defined by the broken circle, is machined against the support surface 28 to allow the foot to slide more easily on the support 28, in the case of the first preferred embodiment of FIG. And/or a low friction surface coated or, in the case of the second preferred embodiment of FIG. 4, a raised or raised bed from the surface 28 of the support 26 and/or machining on the bed and/or It is considered to exhibit a coated low friction surface. Reference numeral 44, which represents a further other broken circle, may be considered to indicate a bed or protrusion raised from the surface 28 of the support 26 for the first positioning means 32 as shown in FIG. 4. have.

6 shows the fastening arrangement used to attach the exhaust module 14 on the support 26. The same principle may be applied in 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, first the fastening bolt 48 is provided with a lengthy sleeve 50, and secondly (the exhaust module is on the support) Positioned, after the positioning means are mated to each other and the holes 30 of the foots 24 are aligned with the threaded holes 46 of the support 26) the bolts are placed on the foot ( 24) is inserted into the hole 30 in the inside, and thirdly the bolt 48 (in the bed of the support or in the flat support) is threaded in the blind hole 46 with a thread in the support 26 and is also screwed onto the support. In order to fix the exhaust module securely, but also tightened with 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 on the support is a set of headless bolts that are first screwed into the threaded blind holes 46 in the support 26. In this case, the shims 54 may be inserted next to the bolts, if necessary, after which the exhaust module is installed as feet around the tanned bolts, then the sleeves are inserted into the bolts, Also lastly the nuts are screwed down to the threaded end of the tanned bolts down to the sleeves. In this case, the positioning means will match somewhat automatically.

Regarding the bolts used to fasten the exhaust module on the support, 8.8 grade bolts are used, depending on the embodiment. The bolts are tightened with medium force so that the tensile stress for the bolt sections with the smallest diameter is approximately ½ of the yield stress. This stress level results in the exhaust module being secured with adequate stability against sliding due to longitudinal force and also presenting a sufficient safety margin in terms of bending stress exerted on the bolt by thermal displacement. With regard to sleeves, they may be made of standard (S355) steel, for example, because their cross-sectional area is larger than that of bolts, and therefore they are not subjected to any specific stress.

FIG. 6 shows in dotted line the insulating cap 56 provided on the bolt to insulate the sleeve and the bolt from the high temperature environment of the exhaust area to prevent deterioration of material properties. 6 also shows that the diameter d of the enlarged cross section of the bolt 48 or preferably but not necessarily is smaller 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 wider than the maximum thermal expansion at the distance of the hole 30 from the positioning means, the foot ( It is ensured that 24) may 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 required in conventional bolting. The bolt 48 has a sleeve 50 extending between the head 52 and the foot 24 of the bolt 48 to press the foot 24 against the support 26. By arranging the sleeve 50 on 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 here the support 24 ) Because there is a head 52 of the bolt 48 which is moved by the sleeve 50 supported on it, and thus tends to move with it. Thus, this relative movement is absorbed by slightly bending by the bolt 48 and possibly by the sleeve 50. Preferably, but not necessarily, at a distance of approximately half the length of the sleeve measured from the bolt head, the bolt has an enlarged cross-section of diameter corresponding to the inner diameter of the sleeve. This design is forced to bend the bolt and sleeve together. The longer the bolt and sleeve, the less the bolt or bolt and sleeve need to bend to allow a certain amount of movement in the foot.

6 also shows shim 54 between foot 24 and support 26. As already described above, the shim has at least one low friction surface, so that the surface facing the low friction surface of the shim slides easily along the shim surface. The shim can also be made of stainless steel or ceramic, which has good friction properties for low friction purposes. Another option is to superimpose the two shims, whereby they are shim surfaces that slide relative to each other.

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

Those skilled in the art will understand that the present invention is not limited to the above-described embodiments, but may be changed within the scope of the appended claims.

Claims (26)

A method for fastening the exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine,
The exhaust module 14 has a number of feet 24, each foot 24 having a first surface 38 facing the hole 30 for the fastening bolt 48 and the support 26. Provided, the support 26 has threaded mounting holes 46 for fastening bolts 48 and second surfaces 28 facing the feet 24 of the exhaust module 14 , The above method
a) a first positioning means 32 which is one of the pin-shaped member 32 and a blind opening is provided to the support 26 and a second positioning means 34 which is one of the blind opening 34 and a pin-shaped member is provided. Providing to the exhaust module 14,
b) providing a low friction means (54) between the feet (24) and the support (26),
c) mounting the exhaust module (14) on the support (26) so that the positioning means match each other,
d) while the exhaust module 14 is heating, with the help of the low friction means the fastening bolts 48 so that the feet 24 of the exhaust module 14 slide on the second surfaces 28. Steps to tighten)
A method of fastening an exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine, comprising a. 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) to the threaded holes (46) in the support (26)
A method for fastening an exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine, characterized in that it comprises a. According to claim 1,
Before step c),
i. Inserting the fastening bolts into the threaded holes 46 in the support 26, and
ii. Screwing the fastening bolts to the threaded holes 46, so that the fastening bolts become headless bolts
A method for fastening an exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine, characterized in that it comprises a. The method of claim 2 or 3,
Step i. Previously, the exhaust module 14 of the internal combustion engine is fastened on the support 26 arranged in relation to the internal combustion engine, characterized in that it comprises inserting a sleeve 50 in each fastening bolt 48. Way. According to claim 1,
In step b), as the low friction means, positioning a shim 54 (shim) having at least one low friction surface between the feet 24 and the support 26 of the exhaust module 14 A method for fastening an exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine, characterized in that it comprises a. According to claim 1,
In step b), the first surface 38 and the second surface to lower frictional properties such that at least one of the first surface 38 and the second surface 28 acts as the low friction means. A method for fastening an exhaust module (14) of an internal combustion engine on a support (26) arranged in relation to the internal combustion engine, characterized in that it comprises machining or coating at least one of (28). According to claim 1,
A support 26 arranged in relation to the internal combustion engine, characterized in that it comprises providing the positioning means 32 in the center of the threaded holes 46. How to fasten on. An arrangement for fastening the exhaust module of an internal combustion engine to a support portion arranged in relation to the internal combustion engine,
The exhaust module 14 has feet 24 adapted to rest on a support 26, each foot 24 being a hole 30 for a fastening bolt 48, and the support ( 26) having a foot surface 38 facing the surface, the support 26 facing threaded holes 46 for fastening bolts 48, and a support surface facing the foot surfaces 38 in use. Equipped with field 28,
A low friction surface is provided between all but the at least one of the feet 24 of the exhaust module 14 and the support 26,
The support 26 has a first positioning means 32, the exhaust module 14 has a second positioning means 34, and the exhaust module 14 is on the support 26. When installed in, the first positioning means 32 and the second positioning means 34 are mated with each other,
The first positioning means is one of the fin-like member 32 and the blind opening, and the second positioning means is one of the blind opening 34 and the fin-like member, wherein the exhaust module of the internal combustion engine is internal combustion. Arrangements for fastening to supports arranged in relation to the engine. The method of claim 8,
The low friction surface is a machined or coated foot surface 38 and/or a machined or coated support surface 28, wherein the exhaust module of an internal combustion engine is arranged in relation to the internal combustion engine. Arrangement for fastening to the support. The method of claim 8,
Shims 54 are arranged between all but the at least one of the feet 24 of the exhaust module 14 and the support 26, the shims 54 having the low friction surface. The arrangement for fastening the exhaust module of the internal combustion engine to a support portion arranged in relation to the internal combustion engine. The method of claim 8,
The fastening bolts 48 have a diameter smaller than the diameter of the holes 30 in the foots 24, so a gap remains between the fastening bolts 48 and the hole 30, and the The gap is characterized in that it absorbs the thermal expansion of the exhaust module (14), an arrangement for fastening the exhaust module of an internal combustion engine to a support arranged in relation to the internal combustion engine. The method of claim 8,
The fastening bolts 48 are provided with a sleeve 50 that is positioned on the foot 24 when the fastening bolt 48 is installed in the hole 30 in the foot 24. Characterized in that, the arrangement for fastening the exhaust module of the internal combustion engine to a support arranged in relation to the internal combustion engine. The method of claim 8,
The fastening bolts (48) are characterized in that they have a sleeve (50) adapted to be positioned on the foot (24) after the exhaust module (14) is installed on the support (26). An arrangement for fastening the exhaust module of the engine to a support portion arranged in relation to the internal combustion engine. The method of claim 8,
The first positioning means (32) is characterized in that it is in the center of the threaded holes (46), an arrangement for fastening the exhaust module of an internal combustion engine to a support arranged in relation to the internal combustion engine. A plurality of cylinders 4 arranged in the first bank 6 and the second bank 8,
A first exhaust manifold (10) for receiving 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) operated on exhaust gas from the cylinders (4) of the first bank (6) of the internal combustion engine (2), and
A second turbocharger (18) operated against exhaust gas from the cylinders of the second bank (8) of the internal combustion engine (2)
An internal combustion engine (2) comprising:
The internal combustion engine (2) is characterized in that it comprises an arrangement according to any one of claims 8 to 14, internal combustion engine. delete delete delete delete delete delete delete delete delete delete delete

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