JP2018053835A - Exhaust turbo supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure strength and prevent heat damage when a turbine housing and an intermediate housing (bearing housing) are made of aluminum and integrated with each other.SOLUTION: A turbine housing 4 and an intermediate housing 6 are integrated with each other as cast in aluminum. A turbine chamber 7 and a turbine side scroll space 8 are formed in the turbine housing 4, and a bearing portion 33 is formed in the intermediate housing 6. An inside jacket 19 and an outside jacket 20 are formed sandwiching the turbine side scroll space 8, and are separated from each other by a partition wall 21. Since inside and outside are continued by the partition wall 21, this structure provides excellent strength. Moreover, since a flow passage between the inside jacket 19 and the outside jacket 20 is simplified, efficiency of cooling water is enhanced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an exhaust turbocharger provided in an internal combustion engine for automobiles or the like.

  The exhaust turbocharger rotates a compressor by a turbine that is rotated by exhaust gas. The turbine and the compressor are connected by a rotating shaft and include a housing having a turbine chamber and a compressor chamber. A turbine-side scroll space is formed outside the outer periphery of the turbine, while a compressor-side scroll space is formed outside the outer periphery of the compressor.

  The exhaust turbocharger housing is generally made of cast steel to ensure heat resistance, and is divided into three parts: a turbine housing, a compressor housing, and an intermediate housing (bearing housing) located between the two. In addition, a turbine chamber and a turbine-side scroll space are formed between the turbine and the intermediate housing, and a compressor chamber is formed between the compressor chamber and the intermediate housing.

  The housing of the exhaust turbocharger is manufactured from a cast steel product in consideration of the heat resistance as described above, but the cast steel product is heavy and is a major negative factor for fuel consumption. Therefore, it is considered to reduce the weight of the housing by using aluminum, and as an example, Patent Document 1 discloses that the entire housing is made of aluminum and a jacket through which cooling water passes is provided.

  Patent Document 1 includes a turbine jacket that encloses the turbine-side scroll space from the outside, a compressor jacket that encloses the compressor-side scroll space from the outside, and an annular bearing jacket that encloses the bearing portion. The cooling water is introduced separately, and the cooling water passing through the turbine jacket and the cooling water passing through the compressor jacket are merged and flow into the bearing jacket.

WO2014 / 103570 publication

  In Patent Document 1, the turbine-side jacket is configured to wrap around the turbine-side scroll space, and the portion of the housing in which the turbine is fitted is in a state of floating largely in the air, And there are concerns about durability. Moreover, in patent document 1, the flow path how cooling water flows is not clear, and it is doubtful whether a turbine housing can be cooled equally.

  Further, since the exhaust gas flowing into the turbine side scroll space changes its direction in the axial direction and is discharged to the exhaust outlet, the portion located on the exhaust outlet side across the turbine side scroll space is hot, Therefore, although it is necessary to cool this part intensively and evenly, in Patent Document 1, although the inlet of the cooling water is located on the exhaust outlet side, the turbine jacket is exhausted with the turbine-side scroll space interposed therebetween. Since the portion located on the outlet side and the portion located on the bearing portion side communicate with each other, the cooling water does not flow sufficiently on the exhaust outlet side of the turbine jacket, and the top of the turbine side scroll space. It is assumed that the bearing part is leaked to the side of the bearing part, and therefore, there is a concern that the part that needs to be cooled may be incompletely cooled.

  The present invention has been made to improve the current situation.

The exhaust turbocharger of the present invention is
A turbine and a compressor that are connected by a rotation shaft and rotate concentrically; a turbine chamber in which the turbine is disposed; a compressor chamber in which the compressor is disposed; and a bearing portion that rotatably holds the rotation shaft. And
The turbine chamber is formed in a turbine housing, and communicates with a turbine-side scroll space surrounding the turbine from the outer periphery. An exhaust outlet that is formed in a posture extending in a direction and that opens to the opposite side of the bearing portion communicates with the turbine chamber,
The compressor chamber is mainly formed in a compressor housing, the bearing portion is formed in an intermediate housing, and the turbine and the intermediate housing are integrally cast.
This is the basic configuration.

  In the first aspect of the present invention, in the basic configuration, an annular cooling water jacket surrounding the turbine-side scroll space is formed in the turbine housing, and the cooling water jacket is positioned on the intermediate housing side. The inside jacket and the outside jacket located on the exhaust outlet side are completely or mostly separated through a partition wall. That is, the jacket is separated into a plurality in the axial direction via the partition walls.

  The present invention has various aspects. For example, the invention according to claim 2 is the invention according to claim 1, wherein the inside jacket and the outside jacket each have an inlet and an outlet for cooling water, and the inlet for the cooling water is disposed below. The exit is located above.

  The invention of claim 3 is the invention according to claim 1 or 2, wherein the inner peripheral portion of the inside jacket enters the axial center side from the inner periphery of the outside jacket.

  In this invention, since the turbine jacket is isolate | separated into the inside jacket and the outside jacket, the partition plays the role of the reinforcement member and has high intensity | strength as a turbine housing. In addition, since the flow path between the inside jacket and outside jacket is simplified, it is easy to flow cooling water evenly throughout the inside jacket and outside jacket, so that the turbine housing can be cooled as evenly as possible. Can do.

  Furthermore, since the cooling water jacket is separated into the inside jacket and the outside jacket that are separated in the axial direction, it is easy to flow the cooling water evenly through the outside jacket. This part can be accurately cooled.

  As described above, since the high temperature portion of the housing can be uniformly and intensively cooled, even when the housing is casted with a light alloy such as aluminum to reduce the weight, the housing is melted, deformed, or not It is possible to prevent the occurrence of thermal strain due to uniform thermal deformation and to keep the turbine rotating smoothly. This can greatly contribute to the practical use of reducing the weight (aluminization) of the housing and improving fuel efficiency.

  It is possible to adopt a configuration in which the inside jacket and the outside jacket are partially communicated so that cooling water flows from one side to the other, and an inlet and an outlet are provided in the inside jacket and the outside jacket, respectively. Cooling water can be flowed separately.

  And, if cooling water is flowed separately to the inside jacket and outside jacket, it is possible to realize fine cooling by changing the flow rate of both, and simplify the flow direction of cooling water to suppress pressure loss and cooling Although there is an advantage that the efficiency can be improved, if the configuration in which the cooling water is flowed from bottom to top as in claim 2 is adopted, the flow direction of the cooling water becomes almost straight, so that pressure loss can be suppressed. In addition to making a significant contribution, the cooling water can be evenly distributed in each jacket. For this reason, it becomes more reliable to cool the turbine housing uniformly and efficiently. Further, even if bubbles are mixed in the cooling water or bubbles are generated due to boiling of the cooling water, there is an advantage that these bubbles can be escaped and eliminated quickly.

  If the structure of Claim 3 is employ | adopted, since the cross-sectional area of an inside jacket can be enlarged, it can suppress significantly that the heat of the turbine chamber side is transmitted to a bearing part. For this reason, thermal expansion of a bearing part can be suppressed and it can contribute to ensuring smooth rotation of a rotating shaft. Furthermore, since the cooling of the inner peripheral part in which the rotating shaft is fitted in the turbine housing can be promoted, the problem that the inner periphery of the turbine housing expands due to thermal expansion and the sealing performance deteriorates can be prevented.

It is a vertical front view of a 1st embodiment. It is a separation vertical front view of a 1st embodiment. It is a figure which shows 1st Embodiment, (A) is the perspective view which looked at the housing from the front, (B) is the rear view seen from the BB view direction of (A) (viewed from the cylinder head side). is there. It is a figure which shows the housing of 1st Embodiment, (A) is a top view, (B) is a bottom view. 2A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. It is a partially broken top view of a housing. (A) is the figure which showed the jacket of 1st Embodiment typically, (B) is the figure which showed the jacket of 2nd Embodiment typically. (A) is the figure which showed the jacket of 3rd Embodiment typically, (B) is the figure which showed the jacket of 4th Embodiment typically. (A) is the figure which showed the jacket of 5th Embodiment typically, (B) is the figure which showed the jacket of 6th Embodiment typically.

(1). Outline of First Embodiment and Turbine Housing Next, an embodiment of the present invention will be described with reference to the drawings. First, an outline will be described. In this embodiment, front / rear / left / right language is used to clarify the direction, but this is oriented from the cylinder head with the longitudinal direction of the rotation axis as the left / right direction and the horizontal direction orthogonal to the longitudinal direction as the front / rear direction. The direction is ahead. As a precaution, the direction is clearly shown in FIG.

  As shown in FIG. 1, the exhaust turbocharger includes a blade-type turbine 1 and a compressor 2, both of which are integrally fixed by a rotating shaft 3. The exhaust turbocharger has a turbine housing 4 and a compressor housing 5, and an intermediate housing 6 positioned between the turbine housing 4 and the turbine housing 4. The turbine housing 4 and the intermediate housing 6 are integrally formed by casting aluminum. Is manufactured. The compressor housing 5 is an aluminum die-cast product or cast product.

  In the turbine housing 4, a turbine chamber 7 in which the turbine 1 is rotatably arranged and a turbine-side scroll space 8 communicating with the outer periphery of the turbine chamber 7 are formed. The turbine-side scroll space 8 has a spiral shape close to an annular shape with a cross-sectional area at the start end larger than that at the end, and at the start end, as shown in FIG. An exhaust gas introduction passage 9 extending in the tangential direction of the part communicates.

  Therefore, the turbine housing 4 has the inlet cylinder part 4a in which the exhaust gas introduction passage 9 is formed, and the turbine side scroll part 4b in which the turbine side scroll space 8 is formed. The flange 12 is formed to be fixed to the cylinder head 11 (or the exhaust manifold) with bolts (and nuts). As shown in FIG. 5, in this embodiment, the exhaust side surface 11 a of the cylinder head 11 is slightly inclined backward so that the distance from the vertical line 13 increases as it goes upward.

  The exhaust gas flowing into the turbine side scroll space 8 from the exhaust gas introduction passage 9 is discharged in the axial direction while rotating the turbine 1 while flowing in the circumferential direction of the turbine side scroll space 8. Accordingly, the turbine housing 4 has a cylindrical exhaust outlet 14 for discharging exhaust gas that opens toward the axial center of the rotary shaft 3, and an exhaust pipe or a catalyst case is connected to the exhaust outlet 14. .

  Further, as partially shown in FIG. 1, a bypass passage 15 that allows exhaust gas to escape from the exhaust gas introduction passage 9 to the exhaust outlet 14 is formed in the turbine housing 4 near the exhaust outlet 14. The bypass passage 15 is located above the exhaust outlet 14. Therefore, as can be easily understood from FIG. 4, an expansion portion 16 connected to the inlet cylinder portion 4 a, the turbine side scroll portion 4 b and the exhaust outlet 14 is formed in the turbine housing 4, and a bypass passage is formed in the expansion portion 16. 15 and a waste gate valve disposition space 17 (see FIG. 1) communicating with this.

  The wastegate valve arrangement space 17 communicates with the exhaust outlet 14 and opens in the axial direction of the rotary shaft 3. The wastegate valve is inserted from the opening direction of the exhaust outlet 14 and is supported by the turbine housing 4 by the support shaft. Connected to In FIG. 4A, reference numeral 18 denotes a hole through which the support shaft is inserted.

  The turbine housing 4 further includes an inside jacket 19 that surrounds the turbine side scroll space 8 and the exhaust gas introduction passage 9 from the side of the intermediate housing 6 as cooling means by cooling water, and the turbine side scroll space 8 and the exhaust gas introduction passage 9. Is formed on the exhaust outlet 14 side. The inside jacket 19 and the outside jacket 20 are divided into left and right by a partition wall 21. Accordingly, the partition wall 21 extends along a plane that divides the exhaust outlet 14 and the scroll part into two parts in the left and right direction (axial direction).

  As shown in FIG. 3 (B) and FIG. 4 (B), the inside jacket 19 and the outside jacket 20 are opened on the rear surface of the inlet tube portion 4a. Further, the inside jacket 19 and the outside jacket 20 have a single flow at the location of the exhaust gas introduction passage 9, but are annular at the location of the turbine-side scroll space 8. The side view shapes of the jackets 19 and 20 are schematically shown in FIG.

  In the present embodiment, the cooling water is set to flow from the inside jacket 19 to the outside jacket 20. Therefore, as shown in FIG. 7, the partition wall 21 is removed to a certain extent at the tip portion on the side opposite to the flange 12, so that cooling water flows from the inside jacket 19 to the outside jacket 20 at the tip portion of the turbine housing 4. The communication path 28 that flows toward the center is formed (see also FIG. 8A). Therefore, in this embodiment, the partition wall 21 is separated vertically.

  Apart from this structure, the inside jacket 19 and the outside jacket 20 are completely separated, and cooling water inlets are formed at the lower ends of the jackets 19, 20 respectively, and cooling water pipes are connected to the cooling water inlets via joints. Can also be connected. Alternatively, the lower end portions of both jackets 19 and 20 can be communicated to form a single cooling water inlet at the communicating portion. In this case, the cooling water flows separately through both jackets 19 and 20.

  As shown in FIG. 2, the outside jacket 20 surrounds the periphery of the turbine-side scroll space 8 in a range of about ¼. The inside jacket 19 has a substantially symmetric shape with the outside jacket 20, but the inner circumference of the inside jacket 19 is a through hole 23 in which the rotating shaft 3 is fitted, as indicated by a dotted line 19 a in FIG. 2. It is possible to extend to near. That is, the inner circumference of the inside jacket 19 can be made smaller than the inner circumference of the outside jacket 20.

  As shown in FIGS. 1 and 2, a plurality of annular grooves 24 are formed on the outer periphery of a portion of the rotating shaft 3 that is fitted in the through hole 23 of the turbine housing 4, and an oil seal 24 a is fitted therein. Further, as shown in FIGS. 4A, 5 and 6, a reinforcing rib 25 extending from the flange 12 to a lower portion of the turbine side scroll space 8 is integrally formed on the lower surface of the inlet cylinder portion 4a. The reinforcing rib 25 overlaps with the partition wall 21 formed in the lower part of the inlet cylinder 4a.

(2). Compressor housing / intermediate housing As shown in FIGS. 1 and 2, the compressor housing 5 includes a compressor chamber 26 in which the compressor 2 is rotatably arranged, and a compressor-side scroll space positioned outside the compressor chamber 26. 27 are formed, and both are connected by a communication path 28. The compressor-side scroll space 27 is formed in a state close to an annular shape, and its cross-sectional area increases from the start end to the end. The end of the compressor-side scroll space 27 is opened in a tangential direction, and a discharge port 29 is connected to the end. Reference numeral 30 in FIG. 1 denotes a mounting boss for the diaphragm actuator.

  A lid member 31 is fitted into the compressor housing 5 from the intermediate housing 6 side, and a compressor-side scroll space 27 is formed by the compressor housing 5 and the lid member 31. The compressor chamber 26 and the communication passage 28 are formed between the lid member 31 and the intermediate housing 6 (accordingly, the compressor housing 5 is constituted by the main body portion and the lid member 31. Yes.)

  As shown in FIGS. 1 and 2, the intermediate housing 6 is formed with a bearing portion 33 into which the rotary shaft 3 is rotatably fitted. A hollow floating metal 34 is disposed on the bearing portion 33 via an oil layer. The midway part of the rotating shaft 3 is rotatably fitted inside the floating metal 34. The floating metal 34 is held in a non-rotatable manner by a stopper 35 fitted or screwed into the bearing portion 33 from below.

  An oil inlet 36 penetrating in the vertical direction is formed at the upper portion of the bearing portion 33. A hollow oil outlet space 37 is formed below the bearing portion 33. As shown in FIG. 5A, the oil outlet space 37 has a semicircular shape in a side view.

  Further, first and second oil scattering spaces 38 and 39 are formed on the left and right sides of the bearing portion 33 in the intermediate housing 6, and the oil scattering spaces 38 and 39 communicate with the oil outlet space 37. ing. In the present embodiment, it can be said that the bearing portion 33 and the turbine housing 4 are separated by the first oil scattering space 38.

  As shown in FIGS. 1 and 2, a first oil seal 40 made of metal or the like is fixed to an end portion of the bearing portion 33 on the compressor housing 5 side. There is a slight gap between the oil seal 40 and the floating metal 34. Further, the cross-sectional display (hatching) of the oil seal 40 is omitted. Further, the left end portion of the intermediate housing 6 has a large opening, and a retainer ring 41 to be fitted to the oil seal 40 is fixed to the large-diameter opening portion, and between the retainer ring 41 and the oil seal 40 is fixed. A second oil seal 41 a made of metal or the like is interposed, and the second oil seal 41 a is fixed to the first oil seal 40. The end of the rotating shaft 3 is fixed to the compressor 2 with a nut 42.

  As shown in FIG. 1, the end of the intermediate housing 6 opposite to the turbine housing 4 is held from the outside by the compressor housing 5, and an elastic C-shaped stopper ring 43 is interposed between the two. The two are held so that they cannot be removed.

(3) Summary of the first embodiment The exhaust turbocharger of the present embodiment is of a type that is directly attached to the cylinder head 11, and the inside jacket 19 and the outside jacket 20 are the rear end of the inlet cylinder portion 4a. Is open. Therefore, by forming a cooling water feed port communicating with the inside jacket 19 and a cooling water return port communicating with the outside jacket 20 in the cylinder head 11, the cooling water flows from the inside jacket 19 to the outside jacket 20. I can. That is, as schematically shown in FIG. 8A, the rear end opening of the inside jacket 19 can be used as the cooling water inlet 45, and the rear end opening of the outside jacket 20 can be formed as the cooling water outlet 46.

  Alternatively, the rear ends of the inside jacket 19 and the outside jacket 20 are closed with a cylinder head 11 via a gasket, a cooling water inlet is formed at the rear end portion of the inside jacket 19, and the rear end portion of the outside jacket 20 is formed. The cooling water can also flow from the inside jacket 19 to the outside jacket 20 by forming the cooling water outlet.

  In any case, since the cooling water is allowed to flow from the inside jacket 19 to the outside jacket 20, the portion around the turbine side scroll space 8 and the portion around the exhaust gas introduction passage 9 can be cooled. Even if the housing 6 is made of aluminum, smooth rotation of the turbine 1 can be secured in a state in which excessive thermal deformation and melting damage are prevented. Therefore, the housing made of aluminum that can contribute to improvement in fuel consumption can be greatly advanced.

  Since the inside jacket 19 and the outside jacket 20 are divided into left and right by a partition wall 21 that surrounds the turbine housing 4 from three sides of the upper part, the front part, and the lower part, the turbine housing 4 can ensure high strength. In addition, since the flow path between the inside jacket 19 and the outside jacket 20 is simplified, the cooling water can flow evenly throughout the inside jacket 19 and the outside jacket 20 without causing a stagnation phenomenon of the cooling water. it can.

  Accordingly, it is possible to prevent distorted thermal deformation and greatly suppress thermal strain. As a result, high reliability and durability can be obtained. In the inlet cylinder portion 4a and the turbine side scroll portion 4b, the exhaust outlet 14 side is hotter than the intermediate housing 6 side, but the cooling water flows from the inside jacket 19 to the outside jacket 20 as in the embodiment. Since the heat transfer from the turbine housing 4 to the intermediate housing 6 can be significantly suppressed, it is possible to prevent excessive temperature rise of the bearing portion 33, which is preferable.

  As shown by a dotted line 19a in FIG. 2, when the inner circumference of the inside jacket 19 is brought close to the inner circumference (hole 23) of the turbine housing 4 (that is, when claim 3 is embodied), heat dissipation to the intermediate housing 6 is accurately performed. This is particularly suitable. In this case, if the interval between the inside jacket 19 and the inner circumference is set to be approximately the same as the thickness t of the turbine side scroll portion 4b at the inside jacket 19, a uniform thermal deformation of the turbine housing 4 is promoted. I can say that.

(4). Other Embodiments As already mentioned, as schematically shown as the second embodiment in FIG. 8 (B), the inside jacket 19 and the outside jacket 20 are used as independent flow paths, respectively. It is also possible to provide a cooling water inlet 45. Alternatively, the lower end portions of the inside jacket 19 and the outside jacket 20 may be communicated, and a cooling water inlet may be provided at the communicating portion.

  In these cases, the cooling water is divided into two branches and rises at the turbine-side scroll space 8, and then merges into one flow, flows toward the rear end of the exhaust gas introduction passage 9, and flows out from the cooling water outlet 46. . The cooling water outlet 46 may be communicated with a jacket formed on the cylinder head 11 or a pipe may be connected separately.

  In this embodiment, since the cooling water rises against gravity, it tends to rise while spreading to every corner of the inside jacket 19 and the outside jacket 20. For this reason, the cooling water can be spread evenly throughout the inside jacket 19 and the outside jacket 20, and the cooling performance is excellent. Further, since the flow rate and the like can be made different between the inside jacket 19 and the outside jacket 20, fine cooling can be realized. Furthermore, even if bubbles exist in the cooling water, the bubbles can be quickly eliminated.

  When cooling water is allowed to flow independently through the inside jacket 19 and the outside jacket 20, as shown in FIG. 9A as a third embodiment, a cooling water inlet 45 is provided at the front end portion so that the cooling water as a whole. It can also be configured to flow in the front-rear direction. In this case, since the flow direction is further simplified, it can be said that the cooling performance can be improved by suppressing the pressure loss. As indicated by the dotted arrow, the flow of the cooling water can be reversed.

  In the fourth embodiment shown in FIG. 9B, the inside jacket 19 and the outside jacket 20 are connected to the exhaust gas introduction passage 9 as a case in which the cooling water flows independently through the inside jacket 19 and the outside jacket 20. Thus, the inside jacket 19 and the outside jacket 20 are each formed in a U-turn shape by being separated vertically by the partition wall 21.

  In this embodiment, the cooling water inlet and outlet are each opened at the rear end of the inlet cylinder 4a. However, only the outlet is opened at the rear end and communicated with the jacket of the cylinder head 11 to provide cooling water. May be formed laterally or the like at the rear end of the inlet cylinder 4a. In the case of FIG. 9B as well, it is preferable to flow the cooling water from the bottom to the top.

  In each of the above-described embodiments, the jackets 19 and 20 are formed up to the inlet cylinder portion 4a. However, in the fifth embodiment shown in FIG. 10A, the inside jacket 19 and the outside jacket 20 are provided only on the turbine side scroll portion 4b. The cooling water is sent separately to these. The cooling water inlet 45 is disposed below and the cooling water outlet 46 is disposed above, but the reverse is also possible. Moreover, the upper part of the inside jacket 19 and the outside jacket 20 may be communicated, and the cooling water outlet 46 may be provided at this communicating portion.

  In the sixth embodiment shown in FIG. 10 (B), the jackets 19 and 20 are formed in the inlet cylinder part 4a, but without reaching the rear end of the inlet cylinder part 4a, near the rear end of the inlet cylinder part 4a. Stop at. Although the inside jacket 19 and the outside jacket 20 are independent, the cooling water may be set to flow from the inside jacket 19 to the outside jacket 20.

  Although several embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, it is possible to have three or more rows of jackets, such as a three-row jacket structure in which a center jacket exists between the inside jacket and the outside jacket (in this case, the partition walls are arranged in two or more rows). Become.).

  The present invention can be embodied in an exhaust turbocharger. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Turbine 2 Compressor 3 Rotating shaft 4 Turbine housing 4a Inlet cylinder part 4b Turbine side scroll part 5 Compressor housing 6 Intermediate housing 7 Turbine chamber 8 Turbine side scroll space 9 Exhaust gas introduction passage 10 Inlet cylinder part 11 Cylinder head 14 Exhaust outlet 19 Inside Jacket 20 Outside jacket 21 Bulkhead 26 Compressor chamber 27 Compressor side scroll space 33 Bearing portion 38, 39 Oil scattering space 45 Cooling water inlet 46 Cooling water outlet

Claims (3)

A turbine and a compressor that are connected by a rotation shaft and rotate concentrically; a turbine chamber in which the turbine is disposed; a compressor chamber in which the compressor is disposed; and a bearing portion that rotatably holds the rotation shaft. And
The turbine chamber is formed in a turbine housing and communicates with a turbine side scroll space surrounding the turbine from the outer periphery, and an exhaust gas introduction passage is tangent to the turbine side scroll space at the start end of the turbine side scroll space. An exhaust outlet that is formed in a posture extending in a direction and that opens to the opposite side of the bearing portion communicates with the turbine chamber,
The compressor chamber is mainly formed in a compressor housing, the bearing portion is formed in an intermediate housing, and the turbine and the intermediate housing are integrally cast,
An annular cooling water jacket that surrounds the turbine-side scroll space is formed in the turbine housing, and the cooling water jacket includes an inside jacket positioned on the intermediate housing side and an out jacket positioned on the exhaust outlet side. The side jacket is completely or mostly separated through a partition wall,
Exhaust turbocharger. The inside jacket and the outside jacket each have a cooling water inlet and outlet, respectively, and the cooling water inlet is disposed below and the outlet is disposed above.
The exhaust turbocharger according to claim 1. The inner peripheral portion of the inside jacket enters the axial center side from the inner periphery of the outside jacket,
The exhaust gas turbocharger according to claim 1 or 2.

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