JP2012047176A - Exhaust conduit for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust conduit for reducing complicatedness more than a conventional technology.SOLUTION: Each exhaust conduit (1, 1a, 1b, 1c and 1d) for an internal combustion engine includes a piping system (10) and at least one deformation compensating part (20) arranged in the extension in the longitudinal direction of the piping system for absorbing the deformation of the piping system (10). The piping system includes at least one cylinder connection part (40; 40a) arranged on the side of a wall (11) of the piping system for exhausting a cylinder of the internal combustion engine. The exhaust conduit for reducing the complicatedness more than the conventional technology. The exhaust conduit is particularly provided by mutually integrally forming the piping system and at least the one deformation compensating part.

Description

  The present invention relates to an exhaust conduit for an internal combustion engine formed according to the description of the writing part of claim 1.

  An exhaust conduit of the above kind is known from e.g. In the exhaust pipe, the piping system has a deformation compensator formed as a separate component, and the deformation compensator is attached to the piping system via a screwed flange, whereby the deformation compensator Detachably connects two separate pipe segments adjacent to each other in the piping system.

  In such an exhaust conduit, it is necessary to provide corresponding connection means, such as flanges or clamp joints, for the individual mounting of the deformation compensator, which increases the complexity of the exhaust conduit.

US Patent Application Publication No. 2014355 German patent invention No. 102004021799

  It is an object of the present invention to provide an exhaust conduit according to claim 1, which is less complex than the prior art.

  The above object is achieved by an exhaust conduit according to claim 1. Further configurations are defined in the dependent claims.

  According to the invention, an exhaust conduit for an internal combustion engine has a piping system and at least one deformation compensation provided in the longitudinal extension of the piping system, in particular to absorb deformation due to temperature. Part. The exhaust conduit according to the present invention is characterized by the following points. That is, the piping system has at least one cylinder connecting portion provided on the side of the wall portion of the piping system for exhausting the cylinder of the internal combustion engine (or in the radial direction), The piping system and the at least one deformation compensator are formed integrally with each other, that is, manufactured as a single constituent member having a common single material structure.

  In the present invention, it is not necessary to provide the connecting means by integrally forming the piping system and the individual deformation compensating portions provided. This reduces the complexity of the piping system due to fewer components and, at the same time, significantly reduces the weight and cost of the piping system.

  By reducing the weight, the vibration mass of the exhaust conduit and the heat capacity of the exhaust conduit are reduced. By reducing the vibration mass, the influence of vibration on the cylinder head of the internal combustion engine and the lateral excitation of the individual deformation compensators are reduced. By reducing the heat capacity, the exhaust conduit according to the invention makes it possible to shorten the warm-up phase for the internal combustion engine and possibly to shorten the reaction time of the downstream catalytic converter.

  According to the embodiment of the present invention, a plurality of cylinder connecting portions according to the present invention are provided along the longitudinal extension of the piping system, whereby the piping system is connected to the plurality of cylinders of the internal combustion engine. It is formed as a collecting pipe for exhaust.

  According to a further embodiment of the present invention, a plurality of deformation compensators according to the present invention are provided with an axial distance from each other along the longitudinal extension of the piping system.

  According to a further embodiment of the present invention, each deformation compensation portion is formed in the wall of the piping system as a compensation structure formed by metal forming, and the piping system is compensated for the deformation compensation portion. At least one portion having no structure is adjacent. The compensation structure is preferably formed as a wave structure or a bellows structure.

  The piping system can preferably be manufactured, for example, by roll bending followed by welding of sheet metal. At this time, the compensation structure is formed during roll bending. That is, it is incorporated in the roll portion.

  According to a further embodiment of the present invention, along the longitudinal extension of the piping system, a plurality of parts not having the compensation structure according to the present invention are provided with an axial distance from each other. Along the extension in the longitudinal direction of the piping system, the deformation compensation portion and the portion not having the compensation structure are preferably provided alternately.

  Therefore, according to the embodiment of the present invention, the plurality of deformation compensators provided alternately with the portions having no compensation structure are provided in the piping system integrally or as an integrated unit. ing.

  According to a further embodiment of the invention, each cylinder connection has a receiving opening formed in the wall of the piping system, in which the exhaust pipe of the cylinder of the internal combustion engine. Can be inserted.

  In this way, at the end where the exhaust pipe is to be inserted, a relatively large degree of structural freedom is given with respect to the inflow geometry, and the tolerance can be reduced.

  According to a further embodiment of the invention, the exhaust pipe is inserted into the receiving opening by a predetermined length dimension of the exhaust pipe so that the exhaust pipe has a predetermined angle, preferably The pipe branches radially from the piping system at an angle larger than 0 ° and smaller than 90 ° with respect to the longitudinal axis of the piping system, and the exhaust pipe is welded to the piping system on the outer peripheral surface. .

  Preferably, the individual cylinder connecting portions are formed in such a manner that the inflow direction of the exhaust pipe is greater than 0 ° and greater than 90 ° with respect to the main flow direction of the piping system in a state where the exhaust pipe of the cylinder is inserted. It is performed so as to be provided at a small angle.

  According to a further embodiment of the present invention, each cylinder connecting portion is formed as a tubular projecting portion in the radial direction of the piping system so as to project from the wall portion of the piping system by metal forming. The receiving opening is formed by a tubular protrusion.

  By forming the cylinder connecting portion so as to protrude, the desired inflow direction of the exhaust pipe can be simultaneously set in an easy manner, thereby eliminating the need for complicated casting.

  According to the embodiment of the present invention, at least one cylinder connecting portion is formed as a welded saddle joint for a pipe incorporated in a wall portion of a piping system, and the receiving opening is formed by a welded saddle joint for a pipe. .

  Such a welded saddle joint for pipes can be put on the piping system later in a simple manner, for example, when applied as a standard part, the desired inflow direction of the exhaust pipe can be set simultaneously, thereby No complicated casting is required.

  According to a further embodiment of the present invention, the guide pipes are inserted in the axial direction on the inner peripheral surfaces of the individual deformation compensation parts of the piping system, and the guide pipes include the compensation structures of the deformation compensation parts. It is bridged in the axial direction. In this way, exhaust vortices that can possibly be caused by the compensation structure can be avoided.

  According to a further embodiment of the present invention, the portion not having the individual compensation structure has a predetermined inner diameter, and the guide tube in the portion not having the individual compensation structure has an outer diameter. is doing. The outer diameter has such a dimension that the guide tube is supported while being in contact with the inner diameter of a portion not having the compensation structure without a gap in the radial direction.

  Thus, the individual guide pipes can be easily and reliably held in the radial direction in the piping system, and only the fixing for each point needs to be performed against the deviation.

  According to a further embodiment of the invention, the individual cylinder connections are formed in a portion of the piping system that does not have a compensation structure.

  According to a further embodiment of the invention, the piping system is formed in a double wall type. In this way, it can be avoided that the exhaust conduit is overheated and that the energy loss of the exhaust becomes too great when a turbocharger is placed after.

  It should be clarified that the invention extends to embodiments that cannot be obtained by a combination of features resulting from explicit citation of the claims. Thereby, the features of the disclosed invention can be arbitrarily combined with each other as long as they are technically significant.

  Hereinafter, the present invention will be described in more detail based on preferred embodiments and with reference to the accompanying drawings.

It is a figure which shows schematically the side surface of the exhaust conduit in which the cylinder connection part for exhaust of the cylinder of an internal combustion engine is provided in one side. It is a figure which shows schematically the side surface of the exhaust pipe in which the cylinder connection part for exhaust_gas | exhaustion of the cylinder of an internal combustion engine is provided in the two sides. FIG. 3 schematically shows a side view of an exhaust conduit according to an embodiment of the invention. FIG. 5 schematically shows a side view of an exhaust conduit according to a further embodiment of the invention. FIG. 5 schematically shows a side view of an exhaust conduit according to a further embodiment of the invention. FIG. 5 schematically shows a side view of an exhaust conduit according to a further embodiment of the invention. FIG. 5 schematically shows a side view of an exhaust conduit according to a further embodiment of the invention.

  1 and 2 show exhaust conduits 100, 100a for an internal combustion engine (not shown), conventionally manufactured by the applicant.

  As shown in FIG. 1, the exhaust conduit 100 has a piping system 101, which has a plurality of separate tube segments 102, for example made of cast iron. Within the extension of the piping system 101 in the longitudinal direction, the deformation compensator 105 (only one is shown in FIG. 1) in order to absorb the deformation of the piping system 101 between two adjacent pipe segments 102. Is provided. In order to connect the individual tube segments 102 and the deformation compensator 105, clamp joints 103 are provided at the respective longitudinal ends of these members, and the clamp joints are bound by the clamps 104. .

  Each tube segment 102 has, on the side of the wall of the tube segment, a cylinder connection 106, for example integrally cast, for exhausting a cylinder (not shown) of an internal combustion engine.

  Similarly, the exhaust conduit 100a of FIG. 2 has a piping system 101a, which has a plurality of separate tube segments 102a, for example made of cast iron. Within the extension in the longitudinal direction of the piping system 101a, a deformation compensator 105a is provided between two adjacent pipe segments 102a in order to absorb deformation of the piping system 101a. In order to connect the individual tube segments 102a and the deformation compensator 105a, a clamp joint 103a is provided at each longitudinal end of these members, and the clamp joints are bound by a clamp 104a. .

  Each pipe segment 102a has a cylinder connection 106a for exhausting a cylinder (not shown) of an internal combustion engine, for example integrally cast, on both sides of the wall of the pipe segment.

  The invention makes it possible in particular to omit the clamp joints 103, 103a and the clamps 104, 104a and the corresponding weld seams.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 3 shows a first embodiment of an exhaust conduit 1 for an internal combustion engine (not shown) according to the invention.

  The exhaust conduit 1 has a piping system 10 and a plurality of deformation compensation units 20 for absorbing deformation of the piping system 10 in the longitudinal extension of the piping system 10.

  The deformation compensator is used in particular to compensate for axial length variations and radial alignment errors due to temperature, and in some cases to mitigate vibrations. An example of the deformation compensator is described in Patent Document 2, for example.

  The piping system 10 and the deformation compensator 20 are formed integrally with each other, that is, from continuous pipes.

  Each deformation compensator 20 is formed in the wall portion 11 of the piping system 10 as a wavy or bellows-shaped compensation structure by, for example, roll forming, and each deformation compensation unit 20 has a compensation structure. At least one portion 30 that does not have is adjacent.

  Therefore, as is apparent from FIG. 3, along the longitudinal extension of the piping system 10, the plurality of deformation compensation portions 20 according to the present invention and the portion 30 that does not include the plurality of compensation structures according to the present invention The deformation compensation portions 20 and the portions 30 that do not have the compensation structure are alternately provided.

  That is, in the piping system 10, the plurality of deformation compensators 20 provided alternately with the portions 30 that do not have the compensation structure are provided integrally or as an integrated unit.

  Further, as apparent from FIG. 3, the portion 30 having no individual compensation structure is disposed on the side of a single longitudinal side of the wall portion 11 of the piping system 10, and the exhaust of a cylinder (not shown) of the internal combustion engine. A cylinder connection 40 is provided.

  Thus, a plurality of cylinder connecting portions 40, 40 are provided along the longitudinal extension of the piping system 10, whereby the piping system is a collecting pipe for exhausting the plurality of cylinders of the internal combustion engine. It is formed as.

  Each cylinder connecting portion 40 has a receiving opening 41 formed in the wall portion 11 of the piping system 10, and an exhaust pipe 50 of each cylinder of the internal combustion engine can be inserted into the receiving opening. Alternatively, the exhaust pipe is inserted into the receiving opening by a predetermined length dimension and welded to the piping system 10 on the outer peripheral surface.

  As apparent from FIG. 3, each exhaust pipe 50 has a predetermined angle, in this case, for example, an angle of about 55 ° with respect to the longitudinal axis L of the piping system 10. Can be inserted or inserted so as to branch in the radial direction. As a result, the individual cylinder connecting portions 40 have the exhaust pipe 50 inserted therein so that the inflow direction ER of the exhaust pipe 50 is at an angle of approximately 55 ° with respect to the main flow direction HR of the piping system 10. Is formed.

  According to the first embodiment of the invention shown in FIG. 3, the individual cylinder connections 40 are preferably hydraulically actuated as radial tubular projections or hemispherical projections of the piping system 10. It is formed so as to protrude from the wall portion 11 of the piping system, and the receiving opening 41 is formed by the tubular protruding portion.

  A guide tube 60 is inserted in the axial direction on the inner peripheral surface of each deformation compensation unit 20 of the piping system 10, and the guide tube extends the compensation structure of each deformation compensation unit 20 in the axial direction or in the longitudinal direction. It is bridged along the direction extension.

  The portion 30 having no compensation structure has a predetermined inner diameter 31, and the guide tube 60 has an outer diameter 61 at the extended end of the guide tube, respectively. The individual guide tubes 60 have a size that is supported while being in contact with the inner diameter 31 of the portion 30 having no individual compensation structure without gaps in the radial direction. In order to fix the position, the guide tube 60 is further fixed to the piping system 10 by, for example, one or a plurality of screws (not shown).

  FIG. 4 shows a second embodiment of an exhaust conduit 1a for an internal combustion engine (not shown) according to the present invention. The exhaust conduit 1a shown in FIG. 4 is identical to the exhaust conduit 1 shown in FIG. 3 except for some slight differences. For this reason, only the difference will be described below. In FIG. 4, the same reference numerals are used for the same members as in FIG.

  Unlike FIG. 3, according to FIG. 4, each cylinder connecting portion 40 a is formed as a welded saddle joint for a pipe incorporated in the wall portion 11 of the piping system 10, and the receiving opening 41 a is a welded saddle joint for the pipe. Is formed by.

  FIG. 5 shows a third embodiment of an exhaust conduit 1b for an internal combustion engine (not shown) according to the present invention. The exhaust conduit 1b shown in FIG. 5 is identical to the exhaust conduit 1 shown in FIG. 3 or the exhaust conduit 1a shown in FIG. 4 except for some slight differences. For this reason, only the difference will be described below. In FIG. 5, the same reference numerals are used for the same members as in FIG. 3 or FIG.

  Unlike FIG. 3 and FIG. 4, according to FIG. 5, the part 30 without the individual compensation structure is the two longitudinal sides of the wall 11 of the piping system 10 that are opposite to each other so as to form a diameter. On the other hand, each has a cylinder connecting portion 40 for exhausting a cylinder (not shown) of the internal combustion engine (that is, two cylinder connecting portions 40 that face each other and are offset in the axial direction). Arranging the cylinder connecting portion 40 in this manner is suitable for an internal combustion engine formed as a V-shaped engine, for example.

  FIG. 6 shows a fourth embodiment of an exhaust conduit 1c for an internal combustion engine (not shown) according to the present invention. The exhaust conduit 1c shown in FIG. 6 is identical to the exhaust conduit 1 shown in FIG. 3 or the exhaust conduit 1a shown in FIG. 4 except for some slight differences. For this reason, only the difference will be described below. In FIG. 6, the same reference numerals are used for the same members as in FIG. 3 or FIG.

  Unlike FIGS. 3 and 4, according to FIG. 6, the cylinder connection 40 of the part 30 without the compensation structure has two opposite directions. In other words, each cylinder connection portion 40 of the portion 30 that does not have the compensation structure provided continuously is the two longitudinal sides of the wall portion 11 of the piping system 10 that face each other so as to form a diameter. Are provided alternately on the side of the. Arranging the cylinder connecting portion 40 in this manner is also suitable for an internal combustion engine formed as a V-shaped engine, for example.

  FIG. 7 shows a fifth embodiment of an exhaust conduit 1d for an internal combustion engine (not shown) according to the present invention. The exhaust conduit 1d shown in FIG. 7 shows a possible variation of the first to fourth embodiments (FIGS. 3 to 6) of the present invention. Accordingly, only the differences will be described below. In FIG. 7, the same reference numerals are used for the same members as in FIGS.

  As can be seen from FIG. 7, according to the first variant, some or all of the guide tubes 60 may be omitted. Additionally or alternatively, according to a second variant, for high exhaust pressures, in some or all parts 30 that do not have any compensation structure and / or some or In all the exhaust pipes 50, the pipe reinforcement part 70 may be attached to the outer peripheral surface.

  According to the sixth embodiment of the present invention not shown in the drawings, the exhaust conduits 1 to 1d of the first to fifth embodiments of the present invention or the piping system 10 of the present embodiment is a double The wall may be formed.

DESCRIPTION OF SYMBOLS 1 Exhaust conduit 1a Exhaust conduit 1b Exhaust conduit 1c Exhaust conduit 1d Exhaust conduit 10 Piping system 11 Wall part 20 Deformation compensation part 30 The part which does not have a compensation structure 31 Inner diameter 40 Cylinder connection part 40a Cylinder connection part 41 Receiving opening part 41a Receiving opening Part 50 Exhaust pipe 60 Guide pipe 61 Outer diameter 70 Pipe reinforcement part 100; 100a Exhaust pipe 101; 101a Piping system 102; 102a Pipe segment 103; 103a Clamp joint 104; 104a Clamp 105; 105a Deformation compensation part 106; 106a Cylinder connection part L Longitudinal axis ER Inflow direction HR Main flow direction

Claims (10)

In order to absorb the deformation of the piping system (10) and the piping system (10), the piping system (10) has at least one deformation compensator (20) provided in the longitudinal extension of the piping system (10). In the exhaust conduit (1, 1a, 1b, 1c, 1d) for the internal combustion engine,
The piping system (10) has at least one cylinder connecting portion (40; 40a) provided on the side of the wall (11) of the piping system for exhausting the cylinder of the internal combustion engine. And
The exhaust pipe (1, 1a, 1b, 1c, 1d) is characterized in that the piping system (10) and the at least one deformation compensator (20) are integrally formed with each other.   The at least one deformation compensation unit (20) is formed in the wall (11) of the piping system (10) in the form of a compensation structure, and the deformation compensation unit (20) includes the piping. 2. Exhaust conduit (1, 1a, 1b, 1c, 1d) according to claim 1, characterized in that the part (30) of the system (10) without at least one compensation structure is adjacent.   The at least one cylinder connecting part (40; 40a) has a receiving opening (41; 41a) formed in the wall (11) of the piping system (10). The exhaust pipe (1, 1a, 1b, 1c, 1d) according to claim 2, characterized in that an exhaust pipe (50) of the cylinder of the internal combustion engine can be inserted into the part.   The exhaust pipe (50) is inserted into the receiving opening (41; 41a) by a predetermined length dimension of the exhaust conduit, whereby the exhaust pipe is at a predetermined angle and the pipe The exhaust conduit (1, 1a) according to claim 3, characterized in that it branches off radially from the system (10) and the exhaust pipe (50) is welded to the piping system (10) on the outer peripheral surface. , 1b, 1c, 1d).   The at least one cylinder connecting part (40) is formed as a radial tubular projecting part of the piping system (10) so as to project from the wall part (11) of the piping system, and the receiving opening Exhaust conduit (1, 1b, 1c, 1d) according to claim 3 or 4, characterized in that the part (41) is formed by the tubular projection.   The at least one cylinder connecting portion (40a) is formed as a welded saddle joint for a pipe incorporated in the wall (11) of the piping system (10), and the receiving opening (41a) is formed by welding the pipe. 5. Exhaust conduit (1a) according to claim 3 or 4, characterized in that it is formed by a saddle joint.   A guide pipe (60) is inserted in the axial direction on the inner peripheral surface of the at least one deformation compensator (20) of the piping system (10), and the guide pipe is connected to the at least one deformation compensator (20). The exhaust conduit (1, 1a, 1b, 1c, 1d) according to any one of claims 2 to 6, characterized in that the compensation structure (1) is bridged in the axial direction.   The portion (30) having no at least one compensation structure has a predetermined inner diameter (31), the guide tube (60) has an outer diameter (61), and the outer diameter is The guide tube (60) has a dimension to be supported while being in contact with the inner diameter (31) of the portion (30) having no compensation structure without a gap in the radial direction. Item 8. The exhaust conduit (1, 1a, 1b, 1c, 1d) according to item 7. 3. The at least one cylinder connection (40; 40a) is formed in a part (30) of the piping system (10) which does not have the at least one compensation structure. The exhaust conduit (1, 1a, 1b, 1c, 1d) according to any one of claims 8 to 10.
  The exhaust pipe (1, 1a, 1b, 1c, 1d) according to any one of claims 1 to 9, characterized in that the piping system (10) is formed in a double wall type.

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