JP2016108974A - Turbine housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing which is easily assembled and positioned to a housing member, and equipped with a tongue portion capable of keeping heat resisting strength.SOLUTION: A turbine housing is equipped with a coupling flange 1 joined with a turbo charger; an outlet flange ED joined with an exhaust system member on a downstream side; a housing member 10 joined with the coupling flange at one opening end portion, and forming a scroll space SS between the coupling flange and the outlet flange; and an inlet flange 3 arranged so as to communicate with a scroll space, and joined with an exhaust system member EU on an upstream side. A tongue 1t dividing the scroll space is integrally formed with the coupling flange.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a turbine housing suitable for a turbocharger of an automobile.

  In general, an exhaust turbocharger called a turbocharger is configured such that a turbine is driven to rotate by energy of an engine exhaust gas, and intake air is compressed by a compressor directly connected thereto and supplied to the engine. ing. A turbine housing that is joined to the turbocharger and joined to the upstream and downstream exhaust system members. For example, Patent Document 1 discloses a housing main body formed of sheet metal in a turbine housing that surrounds a turbine wheel. And a tongue member fixed to the inner peripheral surface of the housing main body and separate from the housing main body, and defining the inlet port and the scroll space inside the housing main body. Has been proposed (described in paragraph [0015] of Patent Document 1).

  Patent Document 2 states that “a turbine housing that houses a turbine of a turbocharger, having a shell-structured scroll portion in which two half-shell members made of steel plates are joined, and on the inlet side of this scroll portion. A turbine housing in which the tongues defining the run-up portion are integrally formed by flaring the half shell member has been proposed (described in paragraph [0006] of Patent Document 2).

Japanese Patent No. 5338991 JP 2006-161574 A

  In the turbine housing described in Patent Literature 1, the “tang member” is “fixed to the inner peripheral surface of the housing main body and separate from the housing main body” with respect to the “housing main body formed of sheet metal”. It is said that. However, it is extremely difficult to assemble the tongue member at an appropriate position in the closed space, and if there is a problem with the assembly, the exhaust gas that is the driving fluid may leak and cause energy loss. Further, since the tongue member is exposed to high-temperature exhaust gas, it is difficult to maintain the heat resistance strength with another member having a small heat capacity. On the other hand, in the case where the steel plate housing itself has a tongue as described in Patent Document 2, it is not easy to form the tongue into a predetermined shape during press molding. Further, it is difficult to increase the thickness of the tongue, and it is difficult to maintain the heat resistance strength. For this reason, Patent Document 1 proposes that the tongue is a separate member.

  Therefore, the present invention relates to a turbine housing joined to a turbocharger, and an object thereof is to provide a turbine housing including a tongue portion that can be easily assembled and positioned with respect to a housing member and can maintain heat-resistant strength.

  In order to achieve the above object, the present invention is a turbine housing which is joined to a turbocharger so as to surround a turbine wheel, and is joined to the upstream and downstream exhaust system members, and is joined to the turbocharger. A coupling flange, an outlet flange joined to the exhaust system member on the downstream side, and one opening end portion joined to the coupling flange to form a scroll space between the coupling flange and the outlet flange. A housing member that communicates with the scroll space, and an inlet flange that is joined to the upstream exhaust system member, and a tongue portion that defines the scroll space is integrated with the coupling flange. It is set as the structure currently formed.

  In the above turbine housing, the housing member may have an engaging portion that engages with the tongue portion. In particular, the coupling flange has a cylindrical main body portion and a bulging portion formed on an outer peripheral side surface of the main body portion, and the tongue portion extends in an axial direction from an end surface of the bulging portion. Are formed integrally, and the engaging portion of the housing member may be formed so as to abut on the tongue portion on at least one side in the circumferential direction of the coupling flange.

  In the above turbine housing, a cylindrical shroud member disposed so as to surround the turbine wheel, wherein an inlet end is joined to the other open end of the housing member, and an outlet is connected to the outlet flange. It is good also as what was provided with the shroud member by which an edge part is slidably supported.

  Further, in the above turbine housing, the housing member is made of sheet metal, and is interposed between the first inner shell having the one open end and the first inner shell joined to the first inner shell. The scroll space may be formed, and the second inner shell having the other opening end may be provided.

  The turbine housing further includes an outer housing member disposed so as to surround the housing member and joined to at least the coupling flange and the outlet flange, and the coupling member is connected to the outlet flange by the outer housing member. You may comprise so that it may hold | maintain in a predetermined positional relationship with respect to a flange. The outer housing member may have an engaging portion formed to abut on the tongue portion on at least one side in the circumferential direction of the coupling flange.

  The outer housing member is made of sheet metal, and includes a first outer shell joined to the coupling flange, and a second outer shell joined to the first outer shell and joined to the outlet flange. It may be a thing.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, in the turbine housing of the present invention, the coupling is joined to the turbocharger in the turbine housing joined to the turbocharger so as to surround the turbine wheel, and joined to the upstream and downstream exhaust system members. A flange, an outlet flange joined to the downstream exhaust system member, a housing member having one open end joined to the coupling flange and forming a scroll space between the coupling flange and the outlet flange, and the scroll space And an inlet flange connected to the upstream exhaust system member, and a tongue portion defining the scroll space is formed integrally with the coupling flange. Assembling of the part is easy and the phase of the tongue part relative to the housing member The positional relationship can be appropriately maintained. Moreover, since the tongue portion is integrally formed with the coupling flange having a large heat capacity, the necessary heat resistance strength can be maintained.

  In the turbine housing described above, if the housing member has an engaging portion that engages with the tongue portion, the coupling flange and the tongue portion can be more easily assembled to the housing member, and the tongue portion can be relative to the housing member. A reliable positional relationship can be maintained. The coupling flange has a cylindrical main body portion and a bulging portion formed on the outer peripheral side surface of the main body portion, and the tongue portion is integrally formed so as to extend in the axial direction from the end surface of the bulging portion. If the engagement portion of the housing member is formed so as to abut on the tongue portion on at least one side in the circumferential direction of the coupling flange, the coupling flange and the tongue portion of the housing member The relative positional relationship can be reliably maintained.

  Furthermore, if the cylindrical shroud member is disposed so as to surround the turbine wheel, its inlet end is joined to the housing member, and the outlet end is slidably supported by the outlet flange. Even when the housing member and the shroud member are thermally expanded due to the heat of the exhaust gas that is the driving fluid, the shroud member slides with respect to the outlet flange and moves away from the turbine wheel. Therefore, stable rotation can be ensured without interfering with the turbine wheel even during thermal expansion of the housing member and the shroud member.

  In the above turbine housing, if the housing member is made of sheet metal, the weight can be reduced and the heat capacity can be reduced. In particular, the housing member has a scroll space formed between the first inner shell having one opening end and the first inner shell joined to the first inner shell, and has the other opening end. It can be provided with a second inner shell, and can be formed easily and inexpensively by sheet metal.

  Further, in the above turbine housing, an outer housing member is provided so as to surround the housing member and is joined to at least the coupling flange and the outlet flange, and the outlet flange is arranged at a predetermined position with respect to the coupling flange by the outer housing member. If it is configured to maintain the relationship, an appropriate heat insulating space can be formed between the outer housing member and the housing member. Furthermore, if the outer housing member has an engaging portion formed so as to abut on the tongue portion on at least one side in the circumferential direction of the coupling flange, the outer housing member and the coupling flange for the housing member In addition, the tongue portion can be easily positioned, and the relative positional relationship can be reliably maintained.

  The outer housing member is also made of sheet metal, and includes a first outer shell joined to the coupling flange, and a second outer shell joined to the first outer shell and joined to the outlet flange. Therefore, the heat insulating space can be easily formed at a low cost.

It is a longitudinal cross-sectional view of the turbine housing which concerns on one Embodiment of this invention. It is a top view of a coupling flange provided for one embodiment of the present invention. It is the perspective view of the coupling flange provided to one Embodiment of this invention, and is the perspective view seen from the arrow A direction of FIG. It is the perspective view of the coupling flange provided to one Embodiment of this invention, and is the perspective view seen from the arrow B direction of FIG. It is the perspective view of the coupling flange provided to one Embodiment of this invention, and was seen from the arrow C direction of FIG. It is the perspective view of the coupling flange with which one Embodiment of this invention is provided, and is the perspective view seen from the arrow D direction of FIG. It is a disassembled perspective view of the turbine housing which concerns on one Embodiment of this invention. It is the perspective view of the coupling flange provided to one Embodiment of this invention, and is the perspective view seen from the arrow E direction of FIG. It is a perspective view which shows the state by which the 1st outer shell was assembled | attached to the coupling flange provided to one Embodiment of this invention. It is a perspective view which shows the state by which the 1st inner shell was assembled | attached to the coupling flange and 1st outer shell which are provided to one Embodiment of this invention. It is a perspective view which shows the state by which the inlet pipe was assembled | attached to the 1st outer shell provided for one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a turbine housing according to an embodiment of the present invention, and FIG. 7 shows each component. In FIG. 7, the main concavo-convex portions of the curved surface portion are appropriately indicated by thin lines. The turbine housing of this embodiment is joined to a turbocharger TC indicated by a two-dot chain line in FIG. 1 so as to surround a turbine wheel (not shown), and is connected to exhaust system members EU and ED on the upstream side and the downstream side. Be joined. Accordingly, for example, the coupling flange 1 joined to the turbocharger TC by a clamp, the outlet flange 2 joined to the downstream exhaust system member ED by a bolt, for example, and the upstream exhaust system member EU by a bolt, for example. The inlet flange 3 is provided. Note that the exhaust system members EU and ED include an exhaust manifold, an exhaust pipe, and the like to be mounted, and the flow of exhaust gas that is a driving fluid is indicated by white arrows in FIG. Further, the upstream exhaust system member EU includes an internal combustion engine (not shown), and the turbine housing can be directly joined to the internal combustion engine.

  One opening end (11a) of the housing member 10 is joined to the coupling flange 1, and a scroll space SS is formed in the housing member 10 between the coupling flange 1 and the outlet flange 2, and the inlet flange 3 is formed. To the scroll space SS via the inlet pipe 3a. The outlet flange 2 has a cylindrical opening 2a and a cylindrical body 2b of an inner peripheral surface continuous with the cylindrical opening 2a, and a support 2g is formed on the inner peripheral surface of the small diameter side opening end. Further, a cylindrical shroud member 30 is disposed so as to surround a turbine wheel (not shown), and an inlet end 31 thereof is joined to the other open end (12a) of the housing member 10, and an outlet The end portion 32 is slidably supported by the support portion 2g of the outlet flange 2.

  The housing member 10 of the present embodiment includes a first inner shell 11 made of a sheet metal having an open end portion 11a, a cylindrical portion 11b, and a flange portion 11c, and an open end portion 12a, a cylindrical body portion 12b, and a flange portion 12c. It consists of a second inner shell 12 made of sheet metal, and is formed into a shell shape having a flange portion 11c and a flange portion 12c in contact with each other, for example, by welding and having an opening at the center. That is, the first inner shell 11 formed in a half shell shape by a sheet metal and the second inner shell 12 formed in a half shell shape by a sheet metal are joined to form a shell-shaped housing member 10. Yes.

  In the present embodiment, the outer housing member 20 is further disposed so as to surround the housing member 10, and is joined to the coupling flange 1 and the outlet flange 2. The outer housing member 20 is formed in a shell shape in which a first outer shell 21 and a second outer shell 22 are each formed in a half shell shape by sheet metal, and are joined by, for example, welding, and have an opening in the center. The opening end 21a of the first outer shell 21 is joined to the coupling flange 1 by, for example, welding, and the opening end 22a of the second outer shell 22 is joined to the outlet flange 2, for example, by welding. That is, an annular step 2d is formed on the outer peripheral surface of the cylindrical portion 2b of the outlet flange 2, and the open end 22a of the second outer shell 22 is joined to the annular step 2d by welding. Thus, an airtight space is formed between the housing member 10 and the outer housing member 20, and a heat insulating layer is formed.

  As shown in FIGS. 1 and 2, the coupling flange 1 of the present embodiment has a cylindrical main body 1 a, an annular convex portion 1 p is formed on one opening end surface, and a tapered surface 1 s is formed on the inner side thereof. The annular step portions 1q and 1r are formed on the outside. The opening end 21a of the first outer shell 21 is disposed at the outermost annular step 1r, and the opening end 11a of the first inner shell 11 is disposed at the annular step 1q. It arrange | positions so that the opening edge part 21a may be pinched | interposed between the part 11a and the annular step part 1r, and these are joined by welding, for example. Further, the coupling flange 1 is formed with a bulging portion 1b on the outer peripheral side surface of the main body portion 1a, and a tongue portion 1t is integrally formed so as to extend in the axial direction from the end surface of the bulging portion 1b. ing. Note that the coupling flange 1 of the present embodiment has only the bulged portion 1b formed on the outer peripheral side surface of the cylindrical main body portion 1a. In addition, a plurality of bulging portions (not shown) are formed on the outer peripheral side surface of the main body 1a as pedestals for joining bolts and nuts (not shown).

  The tongue portion 1t has the shape shown in FIGS. 2 to 6, and the characteristics of this shape will be described later. However, the tongue portion 1t can be formed by any method such as integrated cutting by metal cutting, formation by forging, or integral casting. May be. The first inner shell 11 and the first outer shell 21 are formed with engaging portions that engage with the tongue portions 1t, which will be described later.

  The shroud member 30 is expanded in diameter so as to surround a turbine blade (not shown) constituting a turbine wheel (not shown) with a minimum clearance over the entire circumference, and a stepped inner peripheral side surface is formed. It has a formed inlet end 31 and a cylindrical outlet end 32 continuous therewith. The shroud member 30 is desirably thicker than the housing member 10 and integrally formed by casting or machining (cutting out) in order to ensure rigidity that is not affected by deformation of the mounting target. The shroud member 30 has an outer peripheral side surface of the inlet end portion 31 joined to the open end portion 12a of the second inner shell 12 by welding, for example, and the outlet end portion 32 is supported slidably with respect to the outlet flange 2. The That is, as shown in FIG. 1, the outlet end portion 32 is fitted to the support portion 2g formed on the inner peripheral surface of the cylindrical portion 2b of the outlet flange 2, and the shroud member 30 is airtight with respect to the support portion 2g. It is slidably arranged.

  As described above, the coupling flange 1 of the present embodiment has the annular convex portion 1p, the tapered surface 1s, the annular step portions 1q and 1r formed on the opening end surface of the main body portion 1a, and defines the scroll space SS. The tongue portion 1t is integrally formed with the bulging portion 1b. The coupling flange 1 is formed so as to represent a plane in FIG. 2, and FIGS. 3, 4, 5, and 6 are perspective views seen from the directions of arrows A, B, C, and D in FIG. is there.

  As shown in FIGS. 2 to 6, the tongue portion 1t formed integrally with the coupling flange 1 is formed to extend in the axial direction from the end surface of the bulging portion 1b on the same plane as the annular step portion 1r. It has an arcuate standing wall, its outer surface 1ta and inner surface 1te are formed as curved surfaces, and its top surface 1tb is formed as a flat surface. A curved surface 1tc extending from the top surface 1tb to the annular convex portion 1p is formed on one circumferential side surface side of the tongue portion 1t, and a step portion 1td is formed on the other circumferential side surface side. The step portion 1td is formed so as to be positioned between the top surface 1tb and the annular convex portion 1p, and has a level difference corresponding to the plate thickness of the first inner shell 11.

  The coupling flange 1 having the above-described configuration is assembled in order from the lower member of FIG. 7. Hereinafter, as shown in FIGS. 9 to 11, the first coupling flange 1 shown in FIG. A state in which the outer shell 21, the first inner shell 11, and the inlet pipe 3a are sequentially assembled will be described. The coupling flange 1 (and the tongue portion 1t) shown in FIGS. 8 to 11 is a perspective view seen from the direction E of FIG. 2, and is the same as the coupling flange 1 shown in FIGS. Further, as shown in FIG. 7, the first inner shell 11 constituting the housing member 10 is formed with a cut portion between the circumferential end portions 11d and 11e as an engaging portion that engages with the tongue portion 1t. The first outer shell 21 constituting the outer housing member 20 is formed with a circumferential recess 21c.

  Thus, first, the first outer shell 21 is placed on the coupling flange 1 as shown in FIG. At this time, as shown in FIG. 1, the opening end 21a of the first outer shell 21 is placed on the annular step 1r of the coupling flange 1, and the circumferential recess 21c of the first outer shell 21 is shown in FIG. As shown in the figure, the tongue portion 1t is assembled so as to come into contact with at least one side (both sides in the present embodiment) of the coupling flange 1 in the circumferential direction, so that both are appropriately arranged in a predetermined positional relationship. In this state, for example, the coupling flange 1 and the first outer shell 21 may be temporarily fixed by spot welding, for example, and the entire circumference may be welded after all the assembly is completed.

  Next, as shown in FIG. 10, the first inner shell 11 is placed on the coupling flange 1 and the first outer shell 21. At this time, the open end 11a of the first inner shell 11 is placed on the annular step 1q of the coupling flange 1 as shown in FIG. 1, and the circumferential end 11d of the first inner shell 11 is As shown in FIG. 10, it is assembled so that it engages with the step portion 1td of the tongue portion 1t and the circumferential end portion 11e contacts the lower end of the curved surface 1tc. Be placed. In this state, similarly to the above, the coupling flange 1 and the first inner shell 11 may be temporarily fixed by spot welding, for example, and the entire circumference may be welded after all the assembly is completed. As a result, the top surface of the circumferential end portion 11d of the first inner shell 11 is flush with the top surface 1tb of the tongue portion 1t, and the first inner shell 11 except for the circumferential end portion 11d has a first surface as shown in FIG. The inner wall surface of the open end portion 11 a of the inner shell 11 is flush with the top surface of the annular convex portion 1 p of the coupling flange 1.

  Subsequently, as shown in FIG. 11, the inlet pipe 3 a is fitted into the inlet portion 21 b of the first outer shell 21. Further, although not shown in FIG. 11, the second inner shell 12 shown in FIG. 7 is accommodated in the first outer shell 21. However, in this pre-process, the shroud member 30 is joined to the open end 12a of the second inner shell 12 as shown in FIG. The flange portion 12c of the second inner shell 12 abuts on the flange portion 11c of the first inner shell 11, and the flat portion 12d (shown in FIGS. 1 and 7) of the second inner shell 12 is a tongue portion. It arrange | positions so that it may contact | abut to the top surface 1tb of 1t, Furthermore, as shown in FIG. 7, the 2nd outer shell 22 and the exit flange 2 are mounted | worn, and it joins by welding and will be in the state shown in FIG.

  As a result, the inner surface 1te of the tongue portion 1t constitutes a part of the wall surface of the scroll space SS formed in the first inner shell 11 and the second inner shell 12, and the flow path in the housing member 10 is a tongue. The scroll space SS is surely partitioned by being shielded by the portion 1t. Thus, for example, as shown by a two-dot chain line arrow in FIG. 11, the air introduced from the inlet pipe 3a is a scroll space SS (see FIG. 11) in the first inner shell 11 (and the second inner shell 12). Guided to 1).

  As described above, in the present embodiment, the tongue portion 1t is integrally formed with the coupling flange 1, and the relative positional relationship of the tongue portion 1t with respect to the housing member 10 can be appropriately maintained. In addition to being easy to assemble, a predetermined heat resistance strength can be maintained. Moreover, the engaging portion (circumferential recess 21c) of the first outer shell 21 and the engaging portion (the cut portion between the circumferential end portions 11d and 11e) of the first inner shell 11 are coupled to the tongue portion 1t. Since it is configured to abut on at least one side of the flange 1 in the circumferential direction (both sides in the present embodiment), the relative positional relationship of the tongue portion 1t with respect to the housing member 10 can be easily determined during assembly. Can do.

  Further, even if the housing member 10 and the shroud member 30 are thermally expanded by the heat of the exhaust gas that is the driving fluid, the shroud member 30 slides on the support portion 2g of the outlet flange 2 and from the turbine wheel (not shown). Since it moves in the direction to separate, interference with a turbine blade (not shown) can be avoided appropriately. In this case, the shroud member 30 is disposed so as to be airtightly slidable with respect to the support portion 2g of the outlet flange 2, and when the exhaust gas is introduced from the inlet flange 3 into the scroll space SS, Since the flow of flowing out into the space between the outer housing member 20 and being discharged from the outlet flange 2 is minimized, a desired turbine performance can be ensured. In addition, in order to ensure the further airtightness of the shroud member 30 with respect to the outlet flange 2, a gasket or the like may be interposed between the support portion 2g and the outlet end portion 32.

Reference Signs List 1 coupling flange 1t tongue 2 outlet flange 3 inlet flange 10 housing member 11 first inner shell 12 second inner shell 20 outer housing member 21 first outer shell 22 second outer shell 30 shroud members EU, ED Exhaust system Member SS Scroll space

Claims (8)

  In a turbine housing joined to a turbocharger so as to surround a turbine wheel and joined to an upstream and downstream exhaust system members, a coupling flange joined to the turbocharger, and the downstream exhaust system An outlet flange joined to the member, a housing member having one open end joined to the coupling flange to form a scroll space between the coupling flange and the outlet flange, and communicated with the scroll space And a flange that is joined to the upstream exhaust system member, and a tongue portion that defines the scroll space is formed integrally with the coupling flange.   The turbine housing according to claim 1, wherein the housing member has an engaging portion that engages with the tongue portion.   The coupling flange has a cylindrical main body portion and a bulging portion formed on an outer peripheral side surface of the main body portion, and the tongue portion is integrated so as to extend in an axial direction from an end surface of the bulging portion. The engaging portion of the housing member is formed so as to abut on the tongue portion on at least one side in a circumferential direction of the coupling flange. The turbine housing as described.   A cylindrical shroud member disposed so as to surround the turbine wheel, wherein an inlet end is joined to the other open end of the housing member, and an outlet end is slidable on the outlet flange. The turbine housing according to claim 1, further comprising a shroud member supported by the turbine housing.   The housing member is made of sheet metal, and the scroll space is formed between the first inner shell having the one open end and the first inner shell joined to the first inner shell. The turbine housing according to any one of claims 1 to 4, further comprising a second inner shell having the other open end.   An outer housing member is disposed so as to surround the housing member and is joined to at least the coupling flange and the outlet flange, and the outlet flange is brought into a predetermined positional relationship with respect to the coupling flange by the outer housing member. The turbine housing according to any one of claims 1 to 5, wherein the turbine housing is configured to be held.   The turbine housing according to claim 6, wherein the outer housing member has an engaging portion formed to abut on the tongue portion on at least one side in a circumferential direction of the coupling flange.   The outer housing member is made of sheet metal, and includes a first outer shell joined to the coupling flange, and a second outer shell joined to the first outer shell and joined to the outlet flange. The turbine housing according to claim 6 or 7, wherein the turbine housing is provided.

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