EP2636865A1 - Exhaust manifold - Google Patents
Exhaust manifold Download PDFInfo
- Publication number
- EP2636865A1 EP2636865A1 EP13001126.5A EP13001126A EP2636865A1 EP 2636865 A1 EP2636865 A1 EP 2636865A1 EP 13001126 A EP13001126 A EP 13001126A EP 2636865 A1 EP2636865 A1 EP 2636865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- head
- mounting surface
- main body
- body portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
Definitions
- the present invention relates to an exhaust manifold that that is attached to a cylinder head of an internal combustion engine and allows exhaust gas to pass through.
- Japanese Laid-Open Patent Application No. 2004-52715 presents a known conventional exhaust manifold.
- This conventional exhaust manifold has a hollow dual pipe structure comprising an inner pipe covered by an outer pipe.
- a head flange is fixed to one end of each of the branch pipes of the inner pipe, and the other ends of the inner pipes are connected to a collector inner pipe.
- the head flange has through holes provided between adjacent branch pipes, and a flat surface of the head flange located on the opposite side as the branch pipes is attached to the cylinder head of an engine (internal combustion engine) such that the openings of the branch pipes are aligned with the exhaust ports of the cylinder head.
- the head flange of the exhaust manifold looses heat to the cylinder head and is cooled. Meanwhile, the inner pipes of the branch pipes and the outer pipes covering the inner pipes are at a high temperature because high-temperature exhaust gas flows through the inner pipes and the branch pipes are not cooled by cooling water or the like.
- the present invention was conceived in view of the problem just explained and its object is to provide an exhaust manifold that can prevent the durability of the exhaust manifold from declining due to a difference of thermal expansion between the head flange and the inner and outer pipes.
- An exhaust manifold includes a head flange member, a plurality of branch pipe parts and a collector pipe part.
- the head flange member has a flange main body portion and a cylinder head mounting surface configured and arranged to be attached to a cylinder head of an engine.
- Each of the branch pipe parts has an upstream end portion with respect to an exhaust gas flow fixed to one side of the head flange member that is opposite from the cylinder head mounting surface.
- the collector pipe part is connected to a downstream end portion with respect to the exhaust gas flow of each of the branch pipe parts.
- An area of the cylinder head mounting surface is smaller than a cross sectional area of the head flange main body portion taken along a plane substantially parallel to the cylinder head mounting surface.
- a contact surface area between the cylinder head and the mounting surface of the head flange member that contacts the cylinder head is smaller than the cross sectional area of the head flange main body portion. Consequently, the amount of heat transferred from the head flange to the cooled cylinder head is small and the head flange can be maintained at a higher temperature. As a result, the difference between the thermal expansion amounts of the head flange and the branch pipe parts can be reduced and the durability of the exhaust manifold can be improved.
- a surface of the flange main body portion and the cylinder head mounting surface are preferably connected with a step-shaped level difference in-between.
- the head flange member preferably defines a through hole in a position that avoids the branch pipe parts.
- Figure 1 is a perspective view of an exhaust manifold according to one embodiment of the present invention.
- Figure 2 is a frontal plan view of a head flange member of the exhaust manifold according to the embodiment.
- Figure 3 is a cross sectional view of the head flange member taken along a section line S1-S1 shown in Figure 2 .
- Figure 4 is a cross sectional view of the head flange member taken along a section line S2-S2 shown in Figure 2 .
- the exhaust manifold 2 is attached to a side face of a cylinder head 1a of an engine 1 comprising an internal combustion engine using bolts (not shown).
- the exhaust manifold 2 comprises a head flange member 20, a thin-walled inner pipe (not shown) including a plurality of inner branch pipes (four in this embodiment) and an inner collector pipe (not shown) connected to the inner branch pipes, a thick-walled outer pipe 3 that covers the inner pipe such that a gap exists between the outer circumference of the inner pipe and the inner circumference of the outer pipe 3, and a spacer (not shown).
- a hollow dual-pipe structure disclosed in Japanese Laid-Open Patent Application No. 2004-52715 may be utilized to form the inner branch pipes, the collector pipe and the outer pipe 3 of this embodiment.
- the head flange member 20 has a flange main body portion 2a having a cylinder head mounting surface that is fixed to the cylinder head 1a and a surface that is fixed by welding to exhaust gas upstream end portions of the inner pipe and the outer pipe.
- a plurality of exhaust gas flow holes are provided in the flange main body portion 2a in positions aligned with exhaust ports formed in the cylinder head 1a. The structure of the head flange member 20 will be explained in more detail below.
- the inner pipe is inside the outer pipe 3 and cannot be seen in Figure 1 .
- the inner pipe has four branch inner pipes and a collector inner pipe.
- the exhaust gas upstream end portions of the branch inner pipes are securely attached by welding to the head flange member 20 such that they are aligned with the positions of the exhaust ports.
- the exhaust gas downstream end portions of the branch pipes are connected to an exhaust gas upstream end portion of the collector inner pipe.
- An exhaust gas downstream end portion of the collector inner pipe bends downward from one location on an undersurface.
- the outer pipe 3 comprises branch outer pipes 3a to 3d that cover the four branch inner pipes from the outside such that a gap exists in-between, a collector outer pipe 3e that covers the collector inner pipe from the outside such that a gap exits in-between, and an exhaust outer pipe portion 3f that covers the downwardly bent exhaust gas downstream end portion of the collector inner pipe from the outside such that a gap exists in-between.
- Spacers are disposed between the outer pipe 3 and the inner pipe in several locations to maintain the gaps.
- the spacers are made of, for example, a metal mesh.
- the branch inner pipe and/or the branch outer pipes 3a to 3d correspond to the branch pipe parts of this embodiment, and the collector inner pipe and/or the collector outer pipe 3e correspond to the collector pipe part of this embodiment.
- Figure 2 is a frontal view of the head flange member 20 as seen from the surface of the cylinder head 1a onto which the head flange member 20 mounts.
- the cylinder head mounting surface is shown with hatching.
- Figure 3 is a cross sectional view taken along the section line S1-S1 of Figure 2 .
- the upper side in Figure 3 is the mounting surface side that attaches to the cylinder head 1a, and the lower side is the side having the surface that attaches to the inner pipe and the outer pipe 3.
- Figure 4 is a cross sectional view taken along the section line S2-S2 of Figure 2 .
- the upper side in Figure 4 is the mounting surface side that attaches to the cylinder head 1a, and the lower side is the side having the surface that mates with the inner pipe and the outer pipe 3.
- the head flange member 20 has a plate-shaped flange main body portion 2a, portions 21a to 21d located on one side of the flange main body portion 2a, i.e., the side having the surface that attaches to the cylinder head 1a, and a portion 25 located on the other side of the flange main body portion 2a, i.e., the side having the surface that attaches to the inner pipe and the outer pipe 3 on the opposite side of the flange main body portion 2a as the surface that attaches to the cylinder head 1a.
- the portions 21a to 21d on the side having the cylinder head mounting surface that attaches to the cylinder head 1a correspond to portions indicated with hatching in Figure 2 , and, as shown in Figures 3 and 4 , are configured to protrude toward the cylinder head 1a from the flange main body portion 2a such that a step-shaped level difference exists between the portions 21a to 21d and the flange main body portion 2a.
- the cylinder head mounting surface of the portions 21a to 21d is disposed outwardly of a surface of the flange main body portion 2a when viewed along a direction parallel to the cylinder head mounting surface as shown in Figure 2 .
- the height of the step-shaped level difference is set to 1 mm in this embodiment, but it is acceptable to set a different height.
- the cylinder head mounting surface or the contact surface area (area of the hatched portions in Figure 2 ) between the cylinder head 1a and the surface portions 21a to 21d on the cylinder head side of the flange main body portion 2a is much smaller than the cross sectional surface area of the flange main body portion 2a and the surface area of the portion 25 on the pipe side of the flange man body portion 2a.
- the cross sectional surface area of the flange main body portion 2a refers to a cross sectional surface area of the plate-shaped flange main body portion 2a as taken along a plane substantially parallel to the cylinder head mounting surface (i.e., a horizontal plane in Figure 3 ).
- the portions 21a to 21d on the cylinder head side comprise portions that surround the peripheries of four exhaust gas inlet holes 22a to 22d formed to correspond to the four exhaust ports provided in the cylinder head 1a and portions that surround the peripheries of eight bolt holes 23a to 23d through which bolts are inserted to mount the manifold to the cylinder head 1a.
- the pair of bolt holes 23a, 23b, 23c, 23d corresponding to each of the exhaust ports is positioned diagonally with respect to a line joining the centers of the exhaust ports.
- the portions 21a to 21d on the side having the surface that attaches to the cylinder head 1a are configured to be independent entities corresponding to each of the exhaust ports, and adjacent portions 21a to 21d do not join each another directly.
- the flange main body portion 2a has a cross sectional surface area larger than the other portions 21a to 21d and 25, and a total of three through holes 24a, 24b, and 24c are formed between adjacent holes of the four exhaust gas inlet holes 22a to 22d.
- the through holes 24a, 24b, and 24c provided to further reduce the surface area of the head flange member 20 that contacts the cylinder head 1a.
- the portion 25 on the side having the surface that attaches to the inner pipe and the outer pipe 3 in positions corresponding the exhaust ports.
- the inner pipe and the outer pipe 3 are arranged such that the exhaust gas upstream end portions are inserted into these recesses and the head flange member 20 is welded to the inner pipe and outer pipe 3.
- the surface area of the portion 25 on the pipe side is smaller than the cross sectional surface area of the flange main body portion 2a but slightly larger than the contact surface area of the portions 21a to 21d on the cylinder head side.
- the exhaust gas discharged from the cylinders of the engine 1 exits the exhaust ports of the cylinder head 1a, passes through the exhaust gas inlet holes 22a to 22d of the flange main body portion 2a, and flows to into the branch inner pipes.
- the exhaust gas that flows into the branch inner pipes enters the collector inner pipe and is combined into a single flow passage before discharged downward from the exhaust gas downstream end portion.
- the outer pipe 3 serves to suppress the temperature drop of the exhaust gas in the inner pipes.
- a catalytic converter is provided downstream of the exhaust manifold, and exhaust gas exiting the exhaust manifold activates the cleaning effect of the catalytic converter because it has been held at a high temperature in the exhaust manifold. As a result, the exhaust gas cleaning effect is accelerated. Downstream of the catalytic converter, the exhaust gas passes through an exhaust pipe and a muffler before being released to the outside of the vehicle.
- the inner pipe and the outer pipe 3 of the exhaust manifold are at a high temperature due to the high-temperature exhaust gas. Meanwhile, the head flange member 20 of the exhaust manifold looses heat to the cylinder head 1a because a surface on one side of the head flange member 20 contacts the cylinder head 1a, which is constantly cooled by cooling water while the engine 1 is running.
- the contact surface area between the one surface of the head flange member 20 and the cylinder head 1a is slightly smaller than the cross sectional surface area of the flange main body portion 2a. Consequently the amount of heat lost is small. As a result, the head flange member 20 can be held at a higher temperature and, thus, parts of the exhaust manifold can be prevented from becoming damaged due to a concentration of strain caused by a difference of thermal expansion.
- the contact surface area between the surface on the one side of the head flange member 20 and the cylinder head 1a is slightly smaller than the cross sectional surface area of the flange main body portion 2a. Consequently, the temperature decrease of the head flange member 20 resulting from contact with the cylinder head 1a can be suppressed.
- the parts of the exhaust manifold can be prevented from being damaged due to a concentration of strain caused by a difference of thermal expansion.
- the head flange member 20 Since the aforementioned difference of surface areas can be obtained by configuring the head flange member 20 such that the portions on the side having the surface that attaches to the cylinder head 1a join the flange main body portion 2a through a step-shaped level difference, that is, by removing portions other than the portions on the side having the surface that attaches cylinder head 1a side from the flange main body portion 2a, the head flange member 20 can be fabricated easily and inexpensively.
- the head flange member 20 has through holes 20a to 20c in positions that avoid the branch inner pipes and the outer pipe, the contact surface area between the head flange member 20 and the cylinder head 1a can be reduced further and the temperature decrease of the head flange member 20 can be suppressed further.
- the engine 1 is a four-cylinder type, the invention is not limited to a four-cylinder engine and a six-cylinder engine is also acceptable.
- the exhaust manifold according to the illustrated embodiment has a hollow dual-pipe structure, but the invention is not limited to such a structure.
- the shape of the head flange member 20 and the shapes of the portions on the side of the head flange member 20 having the surface that attaches to the cylinder head can be different from the embodiment.
- the term “comprising” and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps.
- the foregoing also applies to words having similar meanings such as the terms, “including”, “having” and their derivatives.
- the terms “part,” “section,” “portion,” “member” or “element” when used in the singular can have the dual meaning of a single part or a plurality of parts.
- the terms of degree such as “substantially”, “about” and “approximately” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
- This application claims priority to Japanese Patent Application No.
2012-051413, filed on March 8, 2012 2012-051413 - The present invention relates to an exhaust manifold that that is attached to a cylinder head of an internal combustion engine and allows exhaust gas to pass through. Background Information
- Japanese Laid-Open Patent Application No.
2004-52715 - With the conventional exhaust manifold explained above, since the cylinder head is constantly cooled with circulating cooling water and the head flange is fastened to the cylinder head, the head flange of the exhaust manifold looses heat to the cylinder head and is cooled. Meanwhile, the inner pipes of the branch pipes and the outer pipes covering the inner pipes are at a high temperature because high-temperature exhaust gas flows through the inner pipes and the branch pipes are not cooled by cooling water or the like. Consequently, a large temperature difference exists between the head flange and the outer pipe and inner pipe connected to the head flange and a difference between an elongation or expansion amount of the head flange in a lengthwise direction caused by heat and an elongation amount of the inner and outer pipes in a lengthwise direction caused by heat becomes large.
- The present invention was conceived in view of the problem just explained and its object is to provide an exhaust manifold that can prevent the durability of the exhaust manifold from declining due to a difference of thermal expansion between the head flange and the inner and outer pipes.
- An exhaust manifold according to one aspect includes a head flange member, a plurality of branch pipe parts and a collector pipe part. The head flange member has a flange main body portion and a cylinder head mounting surface configured and arranged to be attached to a cylinder head of an engine. Each of the branch pipe parts has an upstream end portion with respect to an exhaust gas flow fixed to one side of the head flange member that is opposite from the cylinder head mounting surface. The collector pipe part is connected to a downstream end portion with respect to the exhaust gas flow of each of the branch pipe parts. An area of the cylinder head mounting surface is smaller than a cross sectional area of the head flange main body portion taken along a plane substantially parallel to the cylinder head mounting surface.
- With this arrangement, a contact surface area between the cylinder head and the mounting surface of the head flange member that contacts the cylinder head is smaller than the cross sectional area of the head flange main body portion. Consequently, the amount of heat transferred from the head flange to the cooled cylinder head is small and the head flange can be maintained at a higher temperature. As a result, the difference between the thermal expansion amounts of the head flange and the branch pipe parts can be reduced and the durability of the exhaust manifold can be improved.
- In the exhaust manifold as described above, a surface of the flange main body portion and the cylinder head mounting surface are preferably connected with a step-shaped level difference in-between. With this arrangement, the contact surface area between the cylinder head and the mounting surface of the head flange member can be made smaller than the cross sectional area of the head flange main body with a simple and inexpensive method.
- In the exhaust manifold as described above, the head flange member preferably defines a through hole in a position that avoids the branch pipe parts. With this arrangement, the contact surface area with respect to the cylinder head can be reduced further and the difference between the thermal expansion amounts of the head flange and the branch pipes can be reduced further.
- Referring now to the attached drawings which form a part of this original disclosure:
-
Figure 1 is a perspective view of an exhaust manifold according to one embodiment of the present invention. -
Figure 2 is a frontal plan view of a head flange member of the exhaust manifold according to the embodiment. -
Figure 3 is a cross sectional view of the head flange member taken along a section line S1-S1 shown inFigure 2 . -
Figure 4 is a cross sectional view of the head flange member taken along a section line S2-S2 shown inFigure 2 . - Selected embodiments will now be explained with reference to the drawings. It will be apparent to those skilled in the art from this disclosure that the following descriptions of the embodiments are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
- The overall constituent features of the exhaust manifold according to one embodiment will now be explained based on
Figure 1 . Theexhaust manifold 2 according to the embodiment is attached to a side face of acylinder head 1a of anengine 1 comprising an internal combustion engine using bolts (not shown). - The
exhaust manifold 2 comprises ahead flange member 20, a thin-walled inner pipe (not shown) including a plurality of inner branch pipes (four in this embodiment) and an inner collector pipe (not shown) connected to the inner branch pipes, a thick-walledouter pipe 3 that covers the inner pipe such that a gap exists between the outer circumference of the inner pipe and the inner circumference of theouter pipe 3, and a spacer (not shown). For example, a hollow dual-pipe structure disclosed in Japanese Laid-Open Patent Application No.2004-52715 outer pipe 3 of this embodiment. - The
head flange member 20 has a flangemain body portion 2a having a cylinder head mounting surface that is fixed to thecylinder head 1a and a surface that is fixed by welding to exhaust gas upstream end portions of the inner pipe and the outer pipe. A plurality of exhaust gas flow holes (four in this embodiment) are provided in the flangemain body portion 2a in positions aligned with exhaust ports formed in thecylinder head 1a. The structure of thehead flange member 20 will be explained in more detail below. - The inner pipe is inside the
outer pipe 3 and cannot be seen inFigure 1 . The inner pipe has four branch inner pipes and a collector inner pipe. The exhaust gas upstream end portions of the branch inner pipes are securely attached by welding to thehead flange member 20 such that they are aligned with the positions of the exhaust ports. The exhaust gas downstream end portions of the branch pipes are connected to an exhaust gas upstream end portion of the collector inner pipe. An exhaust gas downstream end portion of the collector inner pipe bends downward from one location on an undersurface. - The
outer pipe 3 comprises branchouter pipes 3a to 3d that cover the four branch inner pipes from the outside such that a gap exists in-between, a collectorouter pipe 3e that covers the collector inner pipe from the outside such that a gap exits in-between, and an exhaustouter pipe portion 3f that covers the downwardly bent exhaust gas downstream end portion of the collector inner pipe from the outside such that a gap exists in-between. Spacers are disposed between theouter pipe 3 and the inner pipe in several locations to maintain the gaps. The spacers are made of, for example, a metal mesh. - The branch inner pipe and/or the branch
outer pipes 3a to 3d correspond to the branch pipe parts of this embodiment, and the collector inner pipe and/or the collectorouter pipe 3e correspond to the collector pipe part of this embodiment. - The structure of the
head flange member 20 will now be explained in more detail based onFigures 2 to 4 .Figure 2 is a frontal view of thehead flange member 20 as seen from the surface of thecylinder head 1a onto which thehead flange member 20 mounts. InFigure 2 , the cylinder head mounting surface is shown with hatching.Figure 3 is a cross sectional view taken along the section line S1-S1 ofFigure 2 . The upper side inFigure 3 is the mounting surface side that attaches to thecylinder head 1a, and the lower side is the side having the surface that attaches to the inner pipe and theouter pipe 3.Figure 4 is a cross sectional view taken along the section line S2-S2 ofFigure 2 . The upper side inFigure 4 is the mounting surface side that attaches to thecylinder head 1a, and the lower side is the side having the surface that mates with the inner pipe and theouter pipe 3. - As shown in
Figures 2 to 4 , thehead flange member 20 has a plate-shaped flangemain body portion 2a,portions 21a to 21d located on one side of the flangemain body portion 2a, i.e., the side having the surface that attaches to thecylinder head 1a, and aportion 25 located on the other side of the flangemain body portion 2a, i.e., the side having the surface that attaches to the inner pipe and theouter pipe 3 on the opposite side of the flangemain body portion 2a as the surface that attaches to thecylinder head 1a. - The
portions 21a to 21d on the side having the cylinder head mounting surface that attaches to thecylinder head 1a correspond to portions indicated with hatching inFigure 2 , and, as shown inFigures 3 and4 , are configured to protrude toward thecylinder head 1a from the flangemain body portion 2a such that a step-shaped level difference exists between theportions 21a to 21d and the flangemain body portion 2a. In other words, the cylinder head mounting surface of theportions 21a to 21d is disposed outwardly of a surface of the flangemain body portion 2a when viewed along a direction parallel to the cylinder head mounting surface as shown inFigure 2 . The height of the step-shaped level difference is set to 1 mm in this embodiment, but it is acceptable to set a different height. As illustrated inFigure 2 , the cylinder head mounting surface or the contact surface area (area of the hatched portions inFigure 2 ) between thecylinder head 1a and thesurface portions 21a to 21d on the cylinder head side of the flangemain body portion 2a is much smaller than the cross sectional surface area of the flangemain body portion 2a and the surface area of theportion 25 on the pipe side of the flangeman body portion 2a. As used herein, the cross sectional surface area of the flangemain body portion 2a refers to a cross sectional surface area of the plate-shaped flangemain body portion 2a as taken along a plane substantially parallel to the cylinder head mounting surface (i.e., a horizontal plane inFigure 3 ). - The
portions 21a to 21d on the cylinder head side comprise portions that surround the peripheries of four exhaust gas inlet holes 22a to 22d formed to correspond to the four exhaust ports provided in thecylinder head 1a and portions that surround the peripheries of eightbolt holes 23a to 23d through which bolts are inserted to mount the manifold to thecylinder head 1a. The pair ofbolt holes portions 21a to 21d on the side having the surface that attaches to thecylinder head 1a are configured to be independent entities corresponding to each of the exhaust ports, andadjacent portions 21a to 21d do not join each another directly. - Meanwhile, the flange
main body portion 2a has a cross sectional surface area larger than theother portions 21a to 21d and 25, and a total of three throughholes holes head flange member 20 that contacts thecylinder head 1a. - Four recesses for attaching to the inner pipe and the
outer pipe 3 are formed in theportion 25 on the side having the surface that attaches to the inner pipe and theouter pipe 3 in positions corresponding the exhaust ports. The inner pipe and theouter pipe 3 are arranged such that the exhaust gas upstream end portions are inserted into these recesses and thehead flange member 20 is welded to the inner pipe andouter pipe 3. Thus, the surface area of theportion 25 on the pipe side is smaller than the cross sectional surface area of the flangemain body portion 2a but slightly larger than the contact surface area of theportions 21a to 21d on the cylinder head side. - With the
exhaust manifold 2 configured as explained heretofore, the exhaust gas discharged from the cylinders of theengine 1 exits the exhaust ports of thecylinder head 1a, passes through the exhaust gas inlet holes 22a to 22d of the flangemain body portion 2a, and flows to into the branch inner pipes. The exhaust gas that flows into the branch inner pipes enters the collector inner pipe and is combined into a single flow passage before discharged downward from the exhaust gas downstream end portion. When the exhaust gas flows through the inner pipes, theouter pipe 3 serves to suppress the temperature drop of the exhaust gas in the inner pipes. - A catalytic converter is provided downstream of the exhaust manifold, and exhaust gas exiting the exhaust manifold activates the cleaning effect of the catalytic converter because it has been held at a high temperature in the exhaust manifold. As a result, the exhaust gas cleaning effect is accelerated. Downstream of the catalytic converter, the exhaust gas passes through an exhaust pipe and a muffler before being released to the outside of the vehicle.
- During the operation explained above, the inner pipe and the
outer pipe 3 of the exhaust manifold are at a high temperature due to the high-temperature exhaust gas. Meanwhile, thehead flange member 20 of the exhaust manifold looses heat to thecylinder head 1a because a surface on one side of thehead flange member 20 contacts thecylinder head 1a, which is constantly cooled by cooling water while theengine 1 is running. - However, in the exhaust manifold according to the embodiment, the contact surface area between the one surface of the
head flange member 20 and thecylinder head 1a is slightly smaller than the cross sectional surface area of the flangemain body portion 2a. Consequently the amount of heat lost is small. As a result, thehead flange member 20 can be held at a higher temperature and, thus, parts of the exhaust manifold can be prevented from becoming damaged due to a concentration of strain caused by a difference of thermal expansion. - The effects obtainable with the exhaust manifold according to the embodiment will now be reiterated. With the exhaust manifold according to the embodiment, the contact surface area between the surface on the one side of the
head flange member 20 and thecylinder head 1a is slightly smaller than the cross sectional surface area of the flangemain body portion 2a. Consequently, the temperature decrease of thehead flange member 20 resulting from contact with thecylinder head 1a can be suppressed. Thus, the parts of the exhaust manifold can be prevented from being damaged due to a concentration of strain caused by a difference of thermal expansion. - Since the aforementioned difference of surface areas can be obtained by configuring the
head flange member 20 such that the portions on the side having the surface that attaches to thecylinder head 1a join the flangemain body portion 2a through a step-shaped level difference, that is, by removing portions other than the portions on the side having the surface that attachescylinder head 1a side from the flangemain body portion 2a, thehead flange member 20 can be fabricated easily and inexpensively. - Since the
head flange member 20 has through holes 20a to 20c in positions that avoid the branch inner pipes and the outer pipe, the contact surface area between thehead flange member 20 and thecylinder head 1a can be reduced further and the temperature decrease of thehead flange member 20 can be suppressed further. - Although the present invention is explained based on the embodiments, the present invention is not limited to these embodiments. The present invention includes design changes that do not depart from the scope of the invention.
- For example, although the
engine 1 is a four-cylinder type, the invention is not limited to a four-cylinder engine and a six-cylinder engine is also acceptable. The exhaust manifold according to the illustrated embodiment has a hollow dual-pipe structure, but the invention is not limited to such a structure. - Also, the shape of the
head flange member 20 and the shapes of the portions on the side of thehead flange member 20 having the surface that attaches to the cylinder head can be different from the embodiment. - In understanding the scope of the present invention, the term "comprising" and its derivatives, as used herein, are intended to be open ended terms that specify the presence of the stated features, elements, components, groups, integers, and/or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and/or steps. The foregoing also applies to words having similar meanings such as the terms, "including", "having" and their derivatives. Also, the terms "part," "section," "portion," "member" or "element" when used in the singular can have the dual meaning of a single part or a plurality of parts. The terms of degree such as "substantially", "about" and "approximately" as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed.
- While only selected embodiments have been chosen to illustrate the present invention, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims. For example, the size, shape, location or orientation of the various components can be changed as needed and/or desired. Components that are shown directly connected or contacting each other can have intermediate structures disposed between them. The functions of one element can be performed by two, and vice versa. The structures and functions of one embodiment can be adopted in another embodiment. It is not necessary for all advantages to be present in a particular embodiment at the same time. Every feature which is unique from the prior art, alone or in combination with other features, also should be considered a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by such feature(s). Thus, the foregoing descriptions of the embodiments according to the present invention are provided for illustration only, and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.
Claims (4)
- An exhaust manifold (2) comprising:a head flange member (20) having a flange main body portion (2a) and a cylinder head (1a) mounting surface configured and arranged to be attached to a cylinder head (1a) of an engine (1);a plurality of branch pipe parts (3a-3d) with each of the branch pipe parts (3a-3d) having an upstream end portion with respect to an exhaust gas flow fixed to one side of the head flange member (20) that is opposite from the cylinder head (1a) mounting surface; anda collector pipe part (3e) connected to a downstream end portion with respect to the exhaust gas flow of each of the branch pipe parts (3a-3d),an area of the cylinder head (1a) mounting surface being smaller than a cross sectional area of the head flange main body portion (2a) taken along a plane substantially parallel to the cylinder head (1a) mounting surface.
- The exhaust manifold (2) according to claim 1, wherein
a surface of the flange main body portion (2a) and the cylinder head (1a) mounting surface are connected with a step-shaped level difference in-between. - The exhaust manifold (2) according to claim 1 or 2, wherein
the head flange member (20) defines a through hole in a position that avoids the branch pipe parts (3a-3d). - The exhaust manifold (2) according to any one of claims 1 to 3, wherein the cylinder head (1a) mounting surface is disposed outwardly of a surface of the flange main body portion (2a) when viewed along a direction parallel to the cylinder head (1a) mounting surface.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012051413A JP2013185498A (en) | 2012-03-08 | 2012-03-08 | Exhaust manifold |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2636865A1 true EP2636865A1 (en) | 2013-09-11 |
Family
ID=47844043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13001126.5A Withdrawn EP2636865A1 (en) | 2012-03-08 | 2013-03-06 | Exhaust manifold |
Country Status (4)
Country | Link |
---|---|
US (1) | US20130232959A1 (en) |
EP (1) | EP2636865A1 (en) |
JP (1) | JP2013185498A (en) |
CN (1) | CN103306796A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103470888A (en) * | 2013-09-12 | 2013-12-25 | 重庆长安汽车股份有限公司 | Flange and exhaust manifold of engine |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9228462B2 (en) * | 2014-02-06 | 2016-01-05 | Caterpillar Inc. | Jacket-cooled exhaust manifold |
JP6683945B2 (en) * | 2015-12-22 | 2020-04-22 | 三菱自動車工業株式会社 | Exhaust manifold |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997005370A1 (en) * | 1995-07-28 | 1997-02-13 | Regie Nationale Des Usines Renault | Internal combustion engine exhaust device |
JPH10110618A (en) * | 1996-10-04 | 1998-04-28 | Yutaka Giken Co Ltd | Mounting structure of exhaust manifold |
DE10038558A1 (en) * | 1999-08-04 | 2001-02-08 | Iwk Regler Kompensatoren | Connecting device to join exhaust pipe to internal combustion engine |
JP2004052715A (en) | 2002-07-23 | 2004-02-19 | Calsonic Kansei Corp | Exhaust manifold |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3508408B2 (en) * | 1996-08-07 | 2004-03-22 | トヨタ自動車株式会社 | Exhaust manifold mounting structure |
DE10218103A1 (en) * | 2002-04-23 | 2003-11-20 | Boysen Friedrich Gmbh Co Kg | Exhaust manifold for IC engines has solder connections between exhaust pipes and engine mounting flange, pipes and outer shell, and/or shell and flange, preventing inclusion of foreign bodies |
JP4417201B2 (en) * | 2004-08-19 | 2010-02-17 | ダイハツ工業株式会社 | Apparatus for mounting exhaust system parts in an internal combustion engine |
JP2006299926A (en) * | 2005-04-20 | 2006-11-02 | Calsonic Kansei Corp | Fastening structure of exhaust manifold |
-
2012
- 2012-03-08 JP JP2012051413A patent/JP2013185498A/en not_active Withdrawn
-
2013
- 2013-03-05 US US13/785,719 patent/US20130232959A1/en not_active Abandoned
- 2013-03-06 EP EP13001126.5A patent/EP2636865A1/en not_active Withdrawn
- 2013-03-08 CN CN2013100741911A patent/CN103306796A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997005370A1 (en) * | 1995-07-28 | 1997-02-13 | Regie Nationale Des Usines Renault | Internal combustion engine exhaust device |
JPH10110618A (en) * | 1996-10-04 | 1998-04-28 | Yutaka Giken Co Ltd | Mounting structure of exhaust manifold |
DE10038558A1 (en) * | 1999-08-04 | 2001-02-08 | Iwk Regler Kompensatoren | Connecting device to join exhaust pipe to internal combustion engine |
JP2004052715A (en) | 2002-07-23 | 2004-02-19 | Calsonic Kansei Corp | Exhaust manifold |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103470888A (en) * | 2013-09-12 | 2013-12-25 | 重庆长安汽车股份有限公司 | Flange and exhaust manifold of engine |
CN103470888B (en) * | 2013-09-12 | 2016-02-03 | 重庆长安汽车股份有限公司 | Enmgine exhaust and flange |
Also Published As
Publication number | Publication date |
---|---|
CN103306796A (en) | 2013-09-18 |
US20130232959A1 (en) | 2013-09-12 |
JP2013185498A (en) | 2013-09-19 |
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