JP2017089634A - Turbine housing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine housing capable of surely preventing occurrence of thermal deformation, cracking and the like, of a region at an exhaust outlet side of a scroll portion, and improving rigidity and durability.SOLUTION: In a turbine housing 10 including a scroll portion 20 configuring a scroll-shaped exhaust gas flow channel K between an exhaust inlet-side flange 12 configuring an inlet 12a of an exhaust gas B and an exhaust outlet-side flange 13 configuring an outlet 13a of the exhaust gas B, and discharging the exhaust gas to the exhaust outlet side through a turbine wheel 14 disposed on a central portion O of the scroll portion 20, a part of a flow channel face k of the exhaust gas flow channel K of the scroll portion 20 is formed by a scroll member 23 made of casting.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a turbine housing used for a turbocharger (turbocharger) of a vehicle.

  As a turbine housing used for a turbocharger, a cast housing is generally used. On the other hand, a turbine housing made of sheet metal is disclosed in, for example, Patent Document 1. This is shown in FIGS.

  As shown in FIGS. 10 to 12, the turbine housing 1 includes a scroll portion 2 that forms a spiral exhaust gas passage, and a turbine that protrudes from the scroll portion 2 and forms a turbine outlet 2 b that serves as an exhaust gas outlet. An outlet constituting pipe 7 and a bypass passage 5 for bypassing the scroll portion 2 with an external exhaust gas passage (not shown) are provided so as to protrude from the scroll portion 2 and are arranged separately from the turbine outlet constituting pipe 7. And a turbine outlet flange 4 supported by the turbine outlet constituent pipe 7 and the bypass passage constituent pipe 6. In the figure, reference numeral 2a denotes a turbine inlet, and reference numeral 3 denotes a turbine inlet flange.

  The turbine housing 1 supports the turbine outlet flange 4 having a relatively heavy weight with a cast article by two pipes, a turbine outlet constituent pipe 7 and a bypass passage constituent pipe 6.

JP 2008-57448 A

  However, in the conventional turbine housing 1, since the scroll portion 2 is entirely made of sheet metal, it is lightweight, but is easily deformed by heat, cracks, etc., and it is difficult to ensure durability.

  Accordingly, the present invention has been made to solve the above-described problem, and reliably prevents the occurrence of thermal deformation, cracks, and the like in the region on the exhaust outlet side of the scroll portion having a spiral exhaust gas flow path. An object of the present invention is to provide a turbine housing capable of improving rigidity and durability.

  According to a first aspect of the present invention, there is provided a scroll portion that forms a spiral exhaust gas flow path between an exhaust inlet side flange that constitutes an exhaust gas inlet and an exhaust outlet side flange that constitutes the exhaust gas outlet. In the turbine housing that discharges the exhaust gas to the exhaust outlet side via a turbine wheel disposed at the center of the scroll part, a part of the flow path surface of the exhaust gas flow path of the scroll part is made of sheet metal It is formed by a scroll member made of a material having higher heat resistance.

  Invention of Claim 2 is the turbine housing of Claim 1, Comprising: The site | part which opposes the said turbine wheel of the said scroll part is formed with the scroll member which consists of a material more heat-resistant than the said sheet metal, and the remainder Is formed of the sheet metal scroll plate material, and the portion closer to the flange on the exhaust inlet side of the scroll member made of a material having higher heat resistance than the sheet metal is formed thicker than the opposite side portion. It is characterized by that.

  The invention according to claim 3 is the turbine housing according to claim 1, wherein the scroll portion constituting the spiral exhaust gas flow path is divided into at least two divided inner cylinder divided bodies made of sheet metal and the turbine wheel. It is composed of an inner cylinder composed of an inner cylinder divided body made of a material having higher heat resistance than that made of sheet metal located in the opposite part, and the outer cylinder is composed of at least two sheet metal outer cylinder divided bodies. A cylinder is covered at a predetermined interval, the inner cylinder on the exhaust inlet side is brought into contact with the flange on the exhaust inlet side, and the outer cylinder is fixed to the flange on the exhaust inlet side by welding. To do.

  A fourth aspect of the present invention is the turbine housing according to any one of the first to third aspects, wherein the material having higher heat resistance than the sheet metal is formed by casting.

  As described above, according to the invention of claim 1, a scroll member made of a material having a heat resistance higher than that of sheet metal is used for a part of the flow path surface of the exhaust gas flow path of the scroll portion having the spiral exhaust gas flow path. Thus, it is possible to reliably prevent the occurrence of thermal deformation, cracks, and the like in the region on the exhaust outlet side of the scroll portion, and to improve the rigidity and durability.

  According to invention of Claim 2, while forming the site | part which opposes the turbine wheel of a scroll part with the scroll member which consists of material with heat resistance higher than sheet metal, the remaining site | part is formed with the scroll board material made from sheet metal. A part of the flow path surface of the exhaust gas flow path of the scroll portion is formed by a scroll member made of a material having higher heat resistance than that made of sheet metal, and on the exhaust inlet side of the scroll member made of a material having higher heat resistance than that made of sheet metal By forming the part near the flange thicker than the part on the opposite side, it is possible to reliably prevent the occurrence of thermal deformation, cracks, and the like at the part of the scroll part facing the turbine wheel with a simple structure. At the same time, the rigidity and durability can be further improved. Thereby, the clearance (tip clearance) between the scroll portion and the turbine wheel can be easily and reliably secured over time. In addition, since a part of the flow path surface of the exhaust gas flow path of the scroll portion is formed by a scroll member made of a material having higher heat resistance than that of sheet metal, the heat capacity on the exhaust outlet side does not decrease, so the exhaust purification catalyst The catalyst warm-up can be promoted to activate the catalyst, and the catalyst purification performance can be improved.

  According to the invention of claim 3, the scroll part is divided into at least two divided inner cylinders made of sheet metal and an inner cylinder made of a material having higher heat resistance than that made of sheet metal located at a position opposite to the turbine wheel. The inner cylinder is covered with an outer cylinder made of at least two sheet metal outer cylinders divided at a predetermined interval, and the inner cylinder on the exhaust inlet side is covered on the exhaust inlet side. By abutting against the flange and fixing the outer cylinder to the flange on the exhaust inlet side by welding, the inner cylinder can be protected by the outer cylinder, and exhaust gas can be reliably prevented from leaking out of the outer cylinder. can do. Further, even when the scroll portion is thermally expanded due to the heat of the exhaust gas, the inner cylinder on the exhaust inlet side slides on the flange on the exhaust inlet side to allow displacement due to the thermal expansion of the inner cylinder. it can. Thereby, the thermal expansion of a scroll part can be absorbed effectively.

  According to invention of Claim 4, the area | region by the side of the exhaust outlet of the exhaust gas which comprises a part of scroll part by using the scroll member made from the casting formed by casting as a material more heat-resistant than sheet metal Can be manufactured easily and reliably.

It is a side view of the turbine housing used for the turbocharger of a 1st embodiment of the present invention. It is a front view of the said turbine housing. It is a rear view of the said turbine housing. It is sectional drawing of the said turbine housing. It is a partial expanded sectional view which shows the joining state of the scroll member made from a sheet metal of the said turbine housing, and the scroll member made from a casting. (A) is the elements on larger scale which show the joining state of the casting scroll member of the said turbine housing, and an exhaust pipe, (b) is the elements on larger scale which show another joining state of the scroll member made of the said casting, and an exhaust pipe It is. It is sectional drawing which follows the YY line in FIG. It is sectional drawing of the turbine housing used for the turbocharger of the 2nd Embodiment of this invention. It is sectional drawing of the turbine housing used for the turbocharger of the 3rd Embodiment of this invention. It is a side view which shows the turbine housing made from sheet metal used for the conventional turbocharger. It is a rear view of the conventional sheet metal turbine housing. It is sectional drawing which follows the XX line in FIG.

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

  FIG. 1 is a side view of a turbine housing used in a turbocharger according to a first embodiment of the present invention, FIG. 2 is a front view of the turbine housing, FIG. 3 is a rear view of the turbine housing, and FIG. FIG. 5 is a partially enlarged sectional view showing a joining state of a sheet metal scroll member and a casting scroll member of the turbine housing, and FIG. 6A is a casting scroll member and an exhaust pipe of the turbine housing. FIG. 6B is a partially enlarged sectional view showing another joined state of the cast scroll member and the exhaust pipe, and FIG. 7 is a sectional view taken along line YY in FIG. FIG.

  As shown in FIGS. 1 to 4, the turbine housing 10 is used as a housing of a turbocharger (turbocharger) of a vehicle, and includes a flange 11 on the intake inlet side that constitutes an inlet 11 a of intake air (intake air) A, and The spiral exhaust gas provided between the flange 12 on the exhaust inlet side constituting the inlet 12a of the exhaust gas B and the flange 13 on the exhaust outlet side (exhaust flow downstream side) constituting the outlet 13a of the exhaust gas B The inner cylinder 20 as a scroll part constituting the flow path K, the exhaust pipe 30 connected to a location (cylindrical part 23d) on the exhaust outlet side of the inner cylinder 20, and the gap between the inner cylinder 20 and the exhaust pipe 30 G has a so-called double-shell structure consisting of an outer cylinder 40 that covers G (predetermined intervals), and exhaust gas B that has entered from the inlet 12a of the flange 12 on the exhaust inlet side is sent to the center of rotation of the inner cylinder 20 ( Central part) Via the turbine wheel 14 disposed in those discharged from the outlet 13a of the exhaust outlet side of the flange 13.

  As shown in FIG. 1, a compressor 15 that takes in intake air A from the outside is connected to the flange 11 on the intake inlet side, and harmful to the exhaust gas B is connected to the flange 13 on the exhaust outlet side that discharges the exhaust gas B. A catalytic converter (exhaust gas purification device) 16 for removing pollutants is connected to a connecting flange 17 and a connecting pipe 18. That is, the turbine housing 10 is interposed between the compressor 15 on the intake side and the catalytic converter 16.

  As shown in FIGS. 2 and 4, the inner cylinder (scroll portion) 20 substantially defines and forms a spiral exhaust gas flow path K of the exhaust gas B inside the housing, and the outer cylinder 40 includes the inner cylinder 20 and the exhaust gas. The pipe 30 is completely covered with a gap (predetermined interval) G, and the inner cylinder 20 and the exhaust pipe 30 are protected and insulated at the same time, and an outer shell structure that plays a role of increasing the rigidity as the turbine housing 10 is formed. Yes.

  As shown in FIG. 4, the inner cylinder 20 is a first inner cylinder divided body 21 made of a sheet metal and formed of a thin plate-like scroll member that is divided into two in a direction orthogonal to the axial direction L of the turbine shaft 14 a of the turbine wheel 14. And the second inner cylinder divided body 22 and a scroll made of casting formed by casting as a material having higher heat resistance than that made of sheet metal located in a portion facing the turbine wheel 14 (region on the exhaust outlet side of the exhaust gas B). It is comprised from the 3rd inner cylinder division body 23 which consists of board | plate materials.

  As shown in FIGS. 2 and 4, the first inner cylinder divided body 21 and the second inner cylinder divided body 22 are formed into a predetermined curved cylinder shape by pressing a sheet metal, and this press molding is performed. The end part 21b on the rear peripheral side of the first inner cylinder divided body 21 made of two metal plates and the end part 22a on the front peripheral side of the second inner cylinder divided body 22 are joined and fixed by welding. That is, the end portion 21b on the rear peripheral side of the first inner cylinder divided body 21 and the end portion 22a on the front peripheral side of the second inner cylinder divided body 22 are bent so as to be vertically different from each other. The long and short end portions 21b and 22a are fixed to each other by welding (the welded portion is indicated by symbol E).

  Further, as shown in FIGS. 2 and 4, the third inner cylinder divided body 23 is formed into a predetermined curved cylinder shape by a casting part, and as shown in FIGS. 2 The end 22b on the rear peripheral side of the inner cylinder divided body 22 and the stepped concave end 23b on the rear outer peripheral side of the cast third inner cylinder divided body 23 are opposite to the flow path surface k of the exhaust gas flow path K. Are joined and fixed by welding from the surface (the welded portion is indicated by symbol E). Thereby, the part opposite to the turbine wheel 14 as the region on the exhaust outlet side of the exhaust gas B of the inner cylinder 20 is formed by the cast third inner cylinder divided body 23 made of the cast scroll member, and the remaining Is formed of a sheet metal first inner cylinder divided body 21 and a second inner cylinder divided body 22 made of a sheet metal scroll plate material, and a spiral exhaust gas passage K is formed therein. Yes.

  Further, as shown in FIGS. 2 and 4, the front surface 23 a of the cast third inner cylinder divided body 23 is a flat portion, and the area of the lower side (flange 12 on the exhaust inlet side) is the upper side ( It is formed wider than the area on the side opposite to the flange 12 on the exhaust inlet side. That is, as shown in FIG. 4, the portion of the cast third inner cylinder divided body 23 near the flange 12 on the exhaust inlet side is formed thicker than the portion on the opposite side. Thereby, a part of the flow path surface k of the exhaust gas flow path K of the inner cylinder 20 is formed by the cast third inner cylinder divided body 23.

  Further, a step-shaped annular recess 23c is formed on the exhaust inlet side of the cast third inner cylinder divided body 23, and a cylindrical portion (cylindrical portion) 23d is integrally formed on the exhaust outlet side. ing. An annular ring-shaped reinforcing member (not shown) that protects the turbine wheel 14 is fitted in the stepped annular recess 23c.

  As shown in FIG. 6A, the inner wall of the cylindrical portion 23d is formed as a conical slope 23e that expands toward the outlet side, and the exhaust pipe 30 is formed on the slope 23e of the inner wall of the cylindrical portion 23d. The front end portion 31 is fitted and both are fixed by welding (the welded portion is indicated by E).

  As shown in FIGS. 1 to 4, the outer cylinder 40 includes a first outer cylinder divided body 41 that is divided into two along the axial direction L of the turbine shaft 14 a of the turbine wheel 14 (vibration direction during vehicle travel). It is comprised by the sheet metal thin plate member with the 2nd outer cylinder division body 42. As shown in FIG. The first outer cylinder divided body 41 and the second outer cylinder divided body 42 are formed into a predetermined curved shape by pressing a sheet metal, and the first outer cylinder made of the two sheet metals formed by press forming is used. The inner cylinder 20 and the exhaust pipe 30 are completely covered with a gap G by joining the divided body 41 and the second outer cylinder divided body 42 made of sheet metal by welding.

  That is, as shown in FIGS. 1, 3, 4, and 7, the other end portion 41 b extending in a step shape of the first outer cylinder divided body 41 made of sheet metal and the second outer cylinder divided body 42 made of sheet metal. One end portion 42a extending in a stepped shape is welded along the axial direction (axial linear direction) L of the turbine shaft 14a of the turbine wheel 14 with the other end portion 41b of the first outer cylinder divided body 41 facing down. The welded parts are fixed to each other by E). Thus, since the vehicle expands and contracts in the axial direction L of the turbine shaft 14a while the vehicle is traveling, welding along the axial direction L prevents rupture of the weld.

  Further, as shown in FIG. 7, the inner surfaces of the first outer cylinder divided body 41 made of sheet metal and the second outer cylinder divided body 42 made of sheet metal that form the outer cylinder 40 follow the curved shape of the outer cylinder 40. Each of the press-molded sheet metal plates (reinforcing plate members) 45 and 46 is fixed by at least one point welding (dot welding).

  As shown in FIGS. 2 and 4, the flange 11 on the intake inlet side is formed in an annular shape, and a circular opening 11 a at the center is an inlet of the intake air A. Then, on the inner peripheral surface 11b of the flange 11 on the intake inlet side, the end portion 21a on the front peripheral side of the first inner cylinder divided body 21 made of sheet metal of the inner cylinder 20 is welded (the welded portion is indicated by E). It is fixed. Further, on the outer peripheral surface 11c of the flange 11 on the intake inlet side, respective end portions on the front peripheral side of the first outer cylinder divided body 41 made of sheet metal and the second outer cylinder divided body 42 made of sheet metal constituting the outer cylinder 40. 41c and 42c are being fixed by welding (a welding part is shown with the code | symbol E). The flange 11 on the intake inlet side is formed with a plurality of screw holes 11d for bolt mounting at equal intervals.

  As shown in FIG. 4, the flange 12 on the exhaust inlet side is formed in a substantially annular shape, and the opening 12 a serves as an inlet for the exhaust gas B. A step-shaped recess 12c is formed above the outer peripheral surface 12b of the flange 12 on the exhaust inlet side. The lower end portion 21c side of the first inner cylinder divided body 21 made of sheet metal and the lower end portion 22c side of the second inner cylinder divided body 22 made of sheet metal are formed in a semicircular arc shape along the recess 12c. And is slidably fitted around the recess 12c.

  Moreover, as shown in FIGS. 2-4, the 1st outer cylinder division body 41 made from sheet metal which comprises the outer cylinder 40 along the outer peripheral surface 12b of the flange 12 by the side of an exhaust inlet, and the 2nd outer cylinder division made from sheet metal The lower end portions 41e and 42e of the body 42 are formed in a semicircular arc shape, and are fixed to the outer peripheral surface 12b by welding (a welding portion is indicated by a symbol E). The flange 12 on the exhaust inlet side has a plurality of screw holes for bolts (not shown) formed at equal intervals.

  Further, as shown in FIGS. 3 and 4, the flange 13 on the exhaust outlet side is formed in a substantially square plate shape, and a circular opening 13 a at the center thereof serves as an outlet for the exhaust gas B. Then, on the inner peripheral surface 13b of the flange 13 on the exhaust outlet side, each end on the rear peripheral side of the first outer cylinder divided body 41 made of sheet metal and the second outer cylinder divided body 42 made of sheet metal constituting the outer cylinder 40 is provided. The end portions 32 on the rear side of the portions 41d and 42d and the exhaust pipe 30 are fixed by welding (the welded portion is indicated by symbol E). The flange 13 on the exhaust outlet side is formed with screw holes 13d for bolts at the corners.

  According to the turbine housing 10 of the embodiment described above, as shown in FIG. 4, a portion (exhaust gas of the exhaust gas B) facing the turbine wheel 14 of the inner cylinder (scroll portion) 20 having the spiral exhaust gas flow path K. The area on the outlet side) is formed by a cast inner cylinder divided body (cast scroll member) 23, and the remaining part is formed by a sheet metal inner cylinder divided body (sheet metal scroll plate material) 21 and 22. A part of the flow path surface k of the exhaust gas flow path K of the inner cylinder 20 is formed by the cast inner cylinder divided body 23, and the portion near the flange 12 on the exhaust inlet side of the cast inner cylinder divided body 23 Is formed thicker than the portion on the opposite side, thereby making it possible to reliably prevent the occurrence of thermal deformation, cracking, and the like at the portion facing the turbine wheel 14 of the inner cylinder 20 with a simple structure. Stiffness and durability It is possible to further improve. Thereby, the clearance (chip clearance) between the cast inner cylinder divided body 23 of the inner cylinder 20 and the turbine wheel 14 can be easily and reliably secured over time.

  Further, since a part of the flow path surface k of the exhaust gas flow path K of the inner cylinder 20 is formed by the cast inner cylinder divided body 23, the heat capacity on the exhaust outlet side does not decrease, so the catalytic converter 16 The catalyst can be activated by promoting the catalyst warming of the exhaust purification catalyst. Thereby, the catalyst purification performance of the catalytic converter 16 can be improved.

  In addition, the inner cylinder 20 constituting the spiral exhaust gas flow path K is divided into a cast inner cylinder divided into two divided sheet metal inner cylinders 21 and 22 and a portion facing the turbine wheel 14. The inner cylinder 20 is formed by covering the inner cylinder 20 with a predetermined gap G with an outer cylinder 40 composed of two divided sheet metal outer cylinders 41 and 42. 40 can be protected, and the exhaust gas B can be reliably prevented from leaking out of the outer cylinder 40.

  Further, as shown in FIG. 4, the first inner cylinder divided body made of sheet metal of the inner cylinder (scroll portion) 20 along the step-shaped annular recess 12 c formed on the outer peripheral surface 12 b of the flange 12 on the exhaust inlet side. The lower end portion 21c side of 21 and the lower end portion 22c side of the second inner cylinder divided body 22 made of sheet metal are respectively formed in a semicircular curved shape, and are slidably contacted and fitted around the annular recess 12c of the stepped shape. Therefore, even if the inner cylinder 20 is thermally expanded by the heat of the exhaust gas B, the lower end portion 21c of the first inner cylinder divided body 21 made of sheet metal and the second inner cylinder divided body 22 made of sheet metal are used. The lower end portion 22c slides on the outer peripheral surface of the step-shaped annular recess 12c of the flange 12 on the exhaust inlet side, thereby allowing displacement due to thermal expansion of the first and second inner cylinder divided bodies 21 and 22 made of sheet metal. Can do. Thereby, the thermal expansion of the inner cylinder 20 can be absorbed effectively.

  Furthermore, by using a cast scroll plate material formed by casting as a material having higher heat resistance than that made of sheet metal, the third inner part located in the region on the exhaust outlet side of the exhaust gas B forming part of the inner cylinder 20 The cylinder divided body 23 can be manufactured easily and reliably.

  Further, as shown in FIG. 7, the plate reinforcing plate members 45 and 46 are respectively attached to the inner surfaces of the sheet metal first outer cylinder divided body 41 and the sheet metal second outer cylinder divided body 42 constituting the outer cylinder 40. By fixing by welding at least one point, it is possible to reliably prevent distortion deformation of the sheet metal first outer cylinder divided body 41 and the sheet metal second outer cylinder divided body 42 constituting the outer cylinder 40, and The amplitude of the entire outer cylinder 40 can be attenuated. Thereby, the distortion of the sheet metal first outer cylinder divided body 41 and the sheet metal second outer cylinder divided body 42 due to thermal expansion can be effectively dispersed and prevented.

  In the first embodiment, as shown in FIG. 6 (a), the inner wall of the cylindrical portion 23d integrally formed on the exhaust outlet side of the cast third inner cylinder divided body 23 is provided on the outlet side. A conical slope 23e that expands as it goes is formed, and the front end portion 31 of the exhaust pipe 30 is fitted into the slope 23e on the inner wall of the cylindrical portion 23d and fixed by welding, as shown in FIG. 6 (b). As described above, a positioning rib (projection) 23f for positioning the front end 31 of the exhaust pipe 30 is integrally formed on the inner wall of the cylindrical portion 23d, and the positioning rib 23f for the inner wall of the cylindrical portion 23d is formed. The end 31 on the front side of the exhaust pipe 30 may be positioned and fixed by welding (the welded portion is indicated by E). Thus, the front end 31 of the exhaust pipe 30 does not go too far into the inner wall of the cylindrical portion 23d, and the front end 31 of the exhaust pipe 30 is easily and reliably positioned and welded to the cylindrical portion 23d. Can be fixed.

  Moreover, according to the said 1st Embodiment, although the outer cylinder was comprised with the thin-plate member divided into 2 along the axial direction of the turbine shaft of a turbine wheel, it met along the direction orthogonal to the axial direction of the turbine shaft of a turbine wheel. Alternatively, it may be constituted by a thin plate member divided into two.

  Further, according to the first embodiment, the scroll plate material made of casting is formed by casting as a material having higher heat resistance than that made of sheet metal, but a scroll plate material made of a material other than casting may be used. .

  FIG. 8 is a cross-sectional view of the turbine housing when an exhaust gas leakage countermeasure used in the turbocharger according to the second embodiment of the present invention is required.

  The turbine housing 10A according to the second embodiment is different from the casting flange 12 according to the first embodiment in that the flange 12A on the exhaust inlet side is formed by press-molded sheet metal. Further, the lower end portions 41e, 42e of the sheet metal outer cylinder divisions 41, 42 on the exhaust inlet side of the outer cylinder 40 are welded to the inner peripheral surface 12e of the opening 12a of the sheet metal flange 12A (the welded portion is denoted by E). The lower end portion 25b of the sheet metal collar (reinforcing plate material) 25 is fixed to the lower end portions 41e, 42e of the outer cylinder divided bodies 41, 42 by welding (the welded portion is indicated by symbol E). . The lower end portions 21c, 22c of the inner cylinder divided bodies 21, 22 on the exhaust inlet side of the inner cylinder 20 are slidably fitted into the outer peripheral surface 25c of the collar 25. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and detailed descriptions thereof are omitted.

  According to the turbine housing 10A of the second embodiment, the flange 12A and the collar 25 on the exhaust inlet side are formed of press-molded sheet metal, so that compared to the case of the flange 12 made of casting according to the first embodiment, The structure can be simplified, and the cost and weight can be reduced accordingly.

  Further, the lower end portions 21c and 22c of the inner tube divided bodies 21 and 22 made of sheet metal on the exhaust inlet side are slidably fitted to the outer peripheral surface 25c of the collar 25, so that a first scroll member made of sheet metal and made of a thin plate is used. The displacement due to the thermal expansion of the first inner cylinder divided body 21 and the second inner cylinder divided body 22 can be allowed, and the thermal expansion of the inner cylinder 20 as the scroll portion can be effectively absorbed.

  FIG. 9 is a cross-sectional view of the turbine housing when the exhaust gas leakage countermeasure used in the turbocharger according to the third embodiment of the present invention is not required.

  The turbine housing 10B of the third embodiment is different from the casting flange 12 of the first embodiment in that the flange 12B on the exhaust inlet side is formed of a thin sheet metal that is press-formed. . Further, the lower end portions 41e, 42e of the sheet metal outer cylinder divisions 41, 42 on the exhaust inlet side of the outer cylinder 40 are welded to the inner peripheral surface 12e of the bent portion 12d inside the sheet metal flange 12B (the welded portion is Further, the inner cylinder divided bodies 21 and 22 made of sheet metal on the exhaust inlet side of the inner cylinder 20 are fixed to the inner peripheral surfaces 41f and 42f of the lower end portions 41e and 42e of the outer cylinder divided bodies 41 and 42, respectively. The lower end portions 21c and 22c are slidably fitted. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and detailed descriptions thereof are omitted.

  According to the turbine housing 10B of the third embodiment, the flange 12B on the exhaust inlet side is formed by press-formed thin sheet metal, so that the casting flange 12 of the first embodiment and the second Compared to the case where the collar 25 as the reinforcing plate member of the embodiment is required, the structure can be further simplified, and accordingly, the cost can be reduced and the assemblability can be further improved.

  Further, the lower end portions 21c and 22c of the inner cylinder divided bodies 21 and 22 made of sheet metal on the exhaust inlet side are slidably fitted to the inner peripheral surfaces 41f and 42f of the lower end portions 41e and 42e of the outer cylinder divided bodies 41 and 42, respectively. As a result, the first inner cylinder divided body 21 and the second inner cylinder divided body 22 made of sheet metal and made of a thin scroll member can be allowed to displace due to thermal expansion, and the heat of the inner cylinder 20 as the scroll portion can be allowed. Expansion can be absorbed effectively.

10, 10A, 10B Turbine housing 12 Exhaust inlet side flange 12A, 12B Exhaust inlet side sheet metal flange 12a Opening (exhaust gas inlet)
12e Inner circumferential surface 13 Exhaust outlet side flange 13a Opening (exhaust gas outlet)
14 Turbine wheel 20 Inner cylinder (scroll part)
21 1st inner cylinder division body made from sheet metal (scroll member made from sheet metal)
21c Lower end part 22 2nd inner cylinder division body made from sheet metal (scroll member made from sheet metal)
22c lower end 23 cast third inner cylinder divided body (cast scroll member formed by casting as a material having higher heat resistance than sheet metal)
25 Color (Reinforcement plate)
25b Lower end portion 25c Outer peripheral surface 40 Outer cylinder 41 First outer cylinder divided body 41e made of sheet metal 41e Lower end portion 41f Inner peripheral surface 42 Second outer cylinder divided body made of sheet metal 42e Lower end portion 42f Inner peripheral surface B Exhaust gas K Vortex exhaust Gas channel k Channel surface G Gap (predetermined interval)
O Turning center (center)
E Welded part

Claims (6)

A scroll part that forms a spiral exhaust gas flow path between a flange on the exhaust inlet side that constitutes an exhaust gas inlet and a flange on the exhaust outlet side that constitutes an outlet of the exhaust gas; and a central part of the scroll part In the turbine housing that discharges the exhaust gas to the exhaust outlet side via the turbine wheel disposed in
A turbine housing, wherein a part of a flow path surface of the exhaust gas flow path of the scroll portion is formed by a scroll member made of a material having higher heat resistance than that of sheet metal. The turbine housing according to claim 1, comprising:
A portion of the scroll portion facing the turbine wheel is formed by a scroll member made of a material having higher heat resistance than that of the sheet metal, and the remaining portion is formed of the scroll plate material made of the sheet metal, and the sheet metal is made. A turbine housing characterized in that a portion near the flange on the exhaust inlet side of the scroll member made of a material having higher heat resistance is formed thicker than a portion on the opposite side. The turbine housing according to claim 1, comprising:
The scroll portion constituting the spiral exhaust gas flow path is made of a material having higher heat resistance than that of a sheet metal located at a position opposite to the divided inner cylinder divided body made of the sheet metal and the turbine wheel. An inner cylinder formed of a cylinder divided body, the inner cylinder is covered with an outer cylinder formed of at least two sheet metal outer cylinder divided bodies at a predetermined interval, and the inner cylinder on the exhaust inlet side In contact with the flange on the exhaust inlet side, and the outer cylinder is fixed to the flange on the exhaust inlet side by welding. The turbine housing according to any one of claims 1 to 3,
The turbine housing characterized in that the material having higher heat resistance than the sheet metal is formed by casting. The turbine housing according to claim 1, comprising:
The scroll portion constituting the spiral exhaust gas flow path is made of a material having higher heat resistance than that of a sheet metal located at a position opposite to the divided inner cylinder divided body made of the sheet metal and the turbine wheel. The inner cylinder is composed of an inner cylinder composed of a cylinder divided body, the inner cylinder is covered with an outer cylinder composed of at least two sheet metal outer cylinder divided bodies, and the outer cylinder on the exhaust inlet side is covered with a predetermined interval. The lower end portion of the cylinder divided body is fixed to the inner peripheral surface of the opening of the flange made of sheet metal on the exhaust inlet side by welding, and the lower end portion of the reinforcing plate member is attached to the lower end portion of the outer cylinder divided body on the exhaust inlet side. A turbine housing fixed by welding and slidably fitted to the outer peripheral surface of the reinforcing plate member at the lower end of the sheet metal inner cylinder divided body on the exhaust inlet side. The turbine housing according to claim 1, comprising:
The scroll portion constituting the spiral exhaust gas flow path is made of a material having higher heat resistance than that of a sheet metal located at a position opposite to the divided inner cylinder divided body made of the sheet metal and the turbine wheel. The inner cylinder is composed of an inner cylinder composed of a cylinder divided body, the inner cylinder is covered with an outer cylinder composed of at least two sheet metal outer cylinder divided bodies, and the outer cylinder on the exhaust inlet side is covered with a predetermined interval. The lower end portion of the cylinder divided body is fixed to the inner peripheral surface of the opening of the flange made of sheet metal on the exhaust inlet side by welding, and the exhaust gas is fixed to the inner peripheral surface of the lower end portion of the outer cylinder divided body on the exhaust inlet side. A turbine housing characterized in that a lower end portion of the sheet metal inner cylinder division on the inlet side is slidably fitted.

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