JP6449673B2 - Turbine housing - Google Patents

Description

  The present invention relates to a sheet metal 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. 8 and 9, the turbocharger turbine housing 1 includes a center flange 7 that constitutes an inlet of intake air (intake air) A and an inlet side that constitutes an inlet of exhaust gas B in which a turbine wheel 6 a is contained. It has a so-called double shell structure comprising a sheet metal inner housing 2 and a sheet metal outer housing 3 which are connected and fixed to the flange 8 and the outlet side flange 9 constituting the outlet of the exhaust gas B by welding or the like.

  The inner housing 2 substantially defines the flow path of the exhaust gas B inside the housing, and the outer housing 3 covers the inner housing 2 through the gap G, protects the inner housing 2 and simultaneously insulates, and turbine housing. The outer shell structure which plays the role which raises the rigidity as 1 is comprised.

  As shown in FIG. 9, in the inner housing 2, the first inner housing member 2A and the second inner housing member 2B, which are divided into two on the plane orthogonal to the axis L of the turbine shaft 6b of the turbine wheel 6a, are fitted together. It is manufactured by fixing by welding over the entire circumference.

  In addition, the outer housing 3 is formed by fitting a first outer housing member 3A and a second outer housing member 3B, which are divided into two on a plane perpendicular to the axis L of the turbine shaft 6b of the turbine wheel 6a, over the entire circumference. It is manufactured by fixing by welding.

  One end 2 a of the first inner housing member 2 A of the inner housing 2 is connected and fixed to the inner end surface 7 a of the center flange 7 by welding, and one end 3 a of the first outer housing member 3 A of the outer housing 3 is connected to the center flange 7. It is connected and fixed to the formed step 7b by welding. The other end 3b of the second outer housing member 3B of the outer housing 3 is fitted into the outlet pipe 4 fixed to the outlet side flange 9 by welding and fixed by welding, and the second inner housing member 2B of the inner housing 2 is fixed. The other end portion 2b is inserted between the shroud member 5 fixed to the other end portion 3b of the second outer housing member 3B by welding and the other end portion 3b of the second outer housing member 3B.

  A compressor (not shown) for taking in the intake air A from the outside is connected to the center flange 7 side of the intake side, and harmful pollutants of the exhaust gas B are connected to the outlet side flange 9 side that discharges the exhaust gas B. A catalytic converter (not shown) to be removed is connected.

JP 2007-2791 A

In the conventional turbine housing 1, the first outer housing member 3 </ b> A and the second outer housing member 3 </ b> B of the outer housing 3 are divided into two at a portion perpendicular to the axial direction of the exhaust gas B (axis L of the turbine shaft 6 b). The both end portions 3a and 3b are integrated with the outlet pipe 4 fixed to the center flange 7 on the intake side and the exhaust outlet side flange 9 on the exhaust side by welding. Since the weld line of the welded portion E of the first outer housing member 3A and the second outer housing member 3B of the outer housing 3 is perpendicular to the axial direction L of the turbine shaft 6b, the direction of arrow D in FIG. The welded portion E was easily cracked due to the stress toward the surface.

Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a turbine housing that can prevent cracking of a welded portion.

The invention according to claim 1 is a turbine housing in a turbocharger, wherein an inner cylinder that forms an exhaust passage (K) in which a turbine wheel is disposed, a flange that accommodates the turbine wheel together with the inner cylinder, An exhaust inlet side flange constituting an exhaust inlet to the cylinder, an exhaust outlet side flange located on the exhaust outlet side with respect to the inner cylinder, a state fixed to the flange, the exhaust inlet side flange, and the exhaust outlet side flange And an outer cylinder of a thin plate member that completely covers the inner cylinder, wherein the outer cylinder is welded to each of the flange, the exhaust inlet side flange, and the exhaust outlet side flange. And a second outer cylinder divided body welded to each of the flange, the exhaust inlet side flange, and the exhaust outlet side flange, and the first outer cylinder divided body and It said second outer cylinder divided body is characterized by being welded to each other along the axial direction of the turbine shaft of the turbine wheel.

A second aspect of the present invention is the turbine housing according to the first aspect , wherein a step portion is formed at at least one end of the first outer cylinder divided body and the second outer cylinder divided body , and the step The other end is fixed to the part by welding.

A third aspect of the present invention is the turbine housing according to the first aspect , wherein at least one end of the first outer cylinder divided body and the second outer cylinder divided body is folded outward or inward. A bent portion is formed, and the other end of the bent portion is fixed by welding.

According to invention of Claim 1, the crack of a welding part is prevented by fixing several thin-plate members which comprise an outer cylinder along the axial direction of the turbine shaft of a turbine wheel by welding.

  According to the invention of claim 2, a step portion is formed on at least one end portion of the thin plate member, and the other end portion of the adjacent thin plate member is fixed to the step portion by welding, Adjacent ends of a plurality of thin plate members can be easily and reliably welded and fixed.

  According to the invention of claim 3, at least one end portion of the thin plate member is formed with a bent portion bent outward or inward, and the other end portion of the adjacent thin plate member is formed in the bent portion. By being fixed by welding, adjacent end portions of the plurality of thin plate members can be easily and reliably welded and fixed.

It is a side view which shows the turbine housing made from sheet metal used for the turbocharger of one Embodiment of this invention. It is an expanded sectional view of the important section of the turbine housing made from sheet metal of one embodiment of the present invention. (A) is the fragmentary sectional view of the principal part which shows the joining state of the outer cylinder of the said turbine housing, (b) is the fragmentary sectional view of the principal part which shows the other joining state of the same outer cylinder. (A)-(e) is sectional drawing of the principal part which shows the other modification of the joining state of an outer cylinder. (A)-(g) is sectional drawing of the principal part which shows the other modification of the joining state of an outer cylinder. (A)-(g) is sectional drawing of the principal part which shows another modification of the joining state of an outer cylinder. (A)-(e) is sectional drawing of the principal part which shows another modification of the joining state of an outer cylinder. It is a side view of the sheet metal turbine housing used for the conventional turbocharger. It is sectional drawing of the principal part of the said conventional turbine housing.

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

  FIG. 1 is a side view showing a sheet metal turbine housing used in a turbocharger according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part, and FIG. 3A is a joined state of an outer cylinder of the turbine housing. FIG. 3B is a partial cross-sectional view of the main part showing another joined state of the outer cylinder.

  As shown in FIGS. 1 and 2, the turbine housing 10 is used as a housing of a turbocharger (turbocharger) of a vehicle, and includes an intake side (intake air) A including a turbine wheel 13 a. The inner cylinder 20 is fixed by welding to the flange 11 of the exhaust gas, the flange 15 on the exhaust inlet side constituting the inlet of the exhaust gas, and the flange 16 on the exhaust outlet side (downstream side of the exhaust flow) constituting the outlet of the exhaust gas. And a so-called double shell structure comprising the outer cylinder 30.

  As shown in FIG. 1, a compressor 14 that takes in intake air A from the outside is connected to the flange 11 on the intake side, and harmful contamination of the exhaust gas B on the flange 16 on the exhaust outlet side that discharges the exhaust gas B is performed. A catalytic converter (not shown) that removes the substance is connected. That is, the turbine housing 10 is interposed between the intake side compressor 14 and the catalytic converter.

  As shown in FIG. 2, the inner cylinder 20 substantially forms an exhaust flow path K for exhaust gas inside the housing, and the outer cylinder 30 completely covers the inner cylinder 20 with a gap G (predetermined interval), The outer shell structure which plays the role which protects the inner cylinder 20 at the same time, heats it, and raises the rigidity as the turbine housing 10 is comprised.

  The inner cylinder 20 is formed with an L-shaped exhaust passage K inside by joining two sheet metal-made divided bodies 21 and 22 by welding.

  The outer cylinder 30 is divided into a first outer cylinder divided body 31 and a second outer cylinder divided body 32 that are formed in two on the surface along the axial direction L of the turbine shaft 13b of the turbine wheel 13a (vibration direction during vehicle travel). And two sheet metal thin plate members. That is, the first outer cylinder divided body 31 and the second outer cylinder divided body 32 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 is completely covered with a gap G by joining the divided body 31 and the second outer cylinder divided body 32 by welding. Then, as shown in FIG. 3A, the other end portion 31b which is a step portion extending in a step shape of the first outer cylinder divided body 31 and a step portion extending in a step shape of the second outer cylinder divided body 32 are used. The one end 32a is fixed to each other by welding along the axial direction (axial linear direction) L of the turbine shaft 13b of the turbine wheel 13a with the other end 31b of the first outer cylinder divided body 31 facing down. ing. This welded portion is indicated by E. Since the vehicle expands and contracts in the axial direction L of the turbine shaft 13b while the vehicle is running, welding along the axial direction L can prevent the rupture of the weld.

  In addition, as shown in FIG. 3B, the stepped other end portion 31b of the first outer cylinder divided body 31 is overlaid on the stepped one end portion 32a of the second outer cylinder divided body 32 to thereby form a turbine wheel. You may fix to each other by welding along the axial direction L of the turbine shaft 13b of 13a. Moreover, as shown in FIG. 1, the one end part 31a side of the 1st outer cylinder division body 31 and the other end part (illustration omitted) side of the 2nd outer cylinder division body 32 are in the opening part of the flange 15 by the side of an exhaust inlet. Each of them is formed in a semicircular arc shape along the same, and is fixed to the flange 15 on the exhaust inlet side around the opening by welding.

  As shown in FIG. 2, the flange 11 on the intake side is formed in an annular shape having a circular opening 11a, and has an annular plate shape extending outward from the turbine shaft 13b of the turbine wheel 13a on the outer peripheral side thereof. A protrusion 12 is formed. The annular plate-like protrusion 12 has a circumference larger than the circumference of the scroll-like inner cylinder 20 in which the scroll chamber F is formed by the first inner cylinder divided body 21 and the second inner cylinder divided body 22. Yes. And the one end part 21a of the 1st inner cylinder division body 21 is being fixed to the step part 11b of the inner end side around the opening part 11a of the flange 11 by the side of an intake side by welding. Thereby, as shown in FIG. 2, a gap S is formed between the first inner cylinder divided body 21 and the protrusion 12.

  As shown in FIG. 2, a positioning convex portion 12 a that positions one side end portion 31 c of the first outer cylinder divided body 31 is formed on the outer end side of the protrusion 12. A reinforcing rib 12b is integrally formed between the positioning convex portion 12a and the projection 12. And the one side edge part 31c of the 1st outer cylinder division body 31 is being fixed to the convex part 12a for positioning of the protrusion 12 by welding. This welded portion is indicated by E. In addition, one side end portion 32c of the second outer cylinder divided body 32 is fixed to the upper end surface (outer end) 12c of the protrusion 12 by welding. Thereby, the welding part E of the outer cylinder 30 and the protrusion 12 is located outside the scroll-shaped inner cylinder 20.

  According to the turbine housing 10 of the above-described embodiment, the first outer cylinder divided body 31 that is divided into two along the axial direction L of the turbine shaft 13b of the turbine wheel 13a, which is the vibration direction during vehicle travel, and constitutes the outer cylinder 30. And the adjacent end portions 31b, 32a of the second outer cylinder divided body 32 are fixed by welding along the axial direction L of the turbine shaft 13b of the turbine wheel 13a, thereby relieving stress caused by vibration during vehicle travel. It is possible to reliably prevent the welded portion E of the adjacent end portions 31b and 32a of the first outer cylinder divided body 31 and the second outer cylinder divided body 32 from being cracked. Thereby, the turbine housing 10 made of sheet metal in which the state of the welded portion E is more stable over time can be provided at a low cost.

  Further, as shown in FIGS. 3A and 3B, the other end portion 31 b that is the step portion of the first outer cylinder divided body 31 is replaced with one end portion that is the step portion of the adjacent second outer cylinder divided body 32. By overlapping the lower side of 32a or by fixing the upper side by welding, adjacent end portions 31b, 32a of the two first and second outer cylinder divided bodies 31, 32 are welded easily and reliably. Can be fixed.

  In addition, according to the said embodiment, as shown to Fig.3 (a), (b), the edge parts 31b and 32a which adjoin the 1st, 2nd outer cylinder division bodies 31 and 32 are extended horizontally in a step shape. However, the adjacent end portions 31b and 32a of the first and second outer cylinder divided bodies 31 and 32 may have various shapes as shown in FIGS.

  That is, as shown in FIGS. 4C and 4D, one of the adjacent end portions 31b and 32a of the first and second outer cylinder divided bodies 31 and 32 is formed in a step shape, or FIG. As shown in a), (b), and (e), they may be overlapped or butted together without forming a step.

  Further, as shown in FIGS. 5A to 5G, a bent portion 31b in which at least one of the adjacent end portions of the first and second outer cylinder divided bodies 31 and 32 is vertically bent outward. ', 32a', and further, as shown in FIGS. 6 (a) to 6 (g), the tip may be bent further horizontally and vertically.

  Further, as shown in FIGS. 7A to 7E, a bent portion 31b in which at least one of the adjacent end portions of the first and second outer cylinder divided bodies 31 and 32 is vertically bent inward. ", 32a" may be used.

  By these, similarly to the above-described embodiment, the adjacent end portions 31b, 32a, 31b ′, 32a ′, 31b ″, 32a ″ of the two first and second outer cylinder divided bodies 31, 32 can be easily and reliably connected to each other. Can be fixed by welding.

DESCRIPTION OF SYMBOLS 10 Turbine housing 13a Turbine wheel 13b Turbine shaft 14 Compressor 19 Catalytic converter 20 Inner cylinder 30 Outer cylinder 31 1st outer cylinder division body (thin plate member)
31b Step part (one end part)
31b ', 31b "bent portion (one end)
32 Second outer cylinder divided body (thin plate member)
32a, 32a ′, 32a ″ The other end K Exhaust flow path G Gap (predetermined interval)
L axis direction

Claims (3)

A turbine housing (10) in a turbocharger comprising:
An inner cylinder (20) forming an exhaust passage (K) in which the turbine wheel (13a) is disposed;
A flange (11) for accommodating the turbine wheel (13a) together with the inner cylinder (20);
An exhaust inlet side flange (15) constituting an exhaust inlet to the inner cylinder (20);
An exhaust outlet side flange (16) located on the exhaust outlet side with respect to the inner cylinder (20) ;
An outer cylinder (30) of a thin plate member that completely covers the inner cylinder (20) while being fixed to the flange, the exhaust inlet side flange and the exhaust outlet side flange ,
The outer cylinder (30)
A first outer cylinder divided body (31) welded to each of the flange (11), the exhaust inlet side flange (15) and the exhaust outlet side flange (16);
A second outer cylinder divided body (32) welded to each of the flange (11), the exhaust inlet side flange (15) and the exhaust outlet side flange (16),
The first outer cylinder divided body (31) and the second outer cylinder divided body (32) are fixed to each other along the axial direction (L) of the turbine shaft (13b) of the turbine wheel (13a) by welding. A turbine housing. A turbine housing (10) according to claim 1, comprising:
A step portion (31b) is formed on at least one end of the first outer cylinder divided body (31) and the second outer cylinder divided body (32) ,
The turbine housing, wherein the other end (32a) is fixed to the step (31b) by welding. A turbine housing (10) according to claim 1, comprising:
At least one end of the first outer cylinder divided body (31) and the second outer cylinder divided body (32 ) is formed with bent portions (31b ′, 31b ″) bent outward or inward. ,
The other end (32a ′, 32a ″) is fixed to the bent portion by welding.

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