CN111810447A - Compressor housing for turbocharger and method for manufacturing same - Google Patents

Abstract

The invention provides a compressor housing for a turbocharger, which can reduce cost and improve sealing performance. A compressor housing (1) for a turbocharger is divided into a plurality of members including a scroll member (2) and a shroud member (3). The scroll member (2) and the shroud member (3) are assembled to each other by press-fitting a press-fitting portion (53b) provided in the shroud member (3) into a press-fitting portion (53a) provided in the scroll member (2). Furthermore, pressure-bonded sections (541a, 542a) provided on one of the scroll member (2) and the shroud member (3) are pressure-bonded to pressure-bonded sections (541b, 542b) provided on the other of the scroll member (2) and the shroud member (3), and the pressure-bonded sections (541b, 542b) are plastically fluidized to form sealing sections (541, 542) that seal between the two.

Description

Compressor casing for turbocharger and method of making the same

technical field

The present invention relates to a compressor casing for a turbocharger and a method for manufacturing the same.

Background technique

A turbocharger mounted in an internal combustion engine of an automobile or the like has a compressor impeller and a turbine impeller, and these are accommodated in a casing. The compressor impeller is arranged in an air flow path formed inside the compressor casing. The air flow path includes an intake port for sucking air toward the compressor impeller, a diffuser passage through which the compressed air discharged from the compressor impeller passes, and a discharge scroll chamber into which the compressed air passed through the diffuser passage flows. The discharge scroll chamber discharges compressed air to the internal combustion engine side.

Furthermore, in an internal combustion engine such as an automobile, there is a blow-by gas recirculation device (hereinafter referred to as PCV) that recirculates the blow-by gas generated in the crankcase to the intake passage to purify the inside of the crankcase and the cover. ) of the internal combustion engine. In this case, oil (oil mist) contained in the blow-by gas may flow out from the PCV to the intake passage on the upstream side of the compressor in the turbocharger.

At this time, when the outlet air pressure of the compressor is high, the air temperature is also high. Therefore, the oil flowing out of the PCV may be concentrated and high viscosity due to evaporation, and the diffusion surface of the compressor casing for the turbocharger, or the oil flowing out of the PCV. Deposits are formed on the surfaces of the opposing bearing housings, etc., resulting in accumulation. In addition, the accumulation of the deposits narrows the diffusion passage, which reduces the performance of the turbocharger, which in turn may result in a reduction in the output of the internal combustion engine.

Conventionally, the outlet air temperature of the compressor has been suppressed to some extent in order to prevent the deposition of deposits in the diffusion passage as described above. Therefore, the performance of the turbocharger cannot be fully exerted, and the output of the internal combustion engine cannot be sufficiently increased.

Patent Document 1 discloses a configuration in which a refrigerant flow path is provided in the compressor casing for a turbocharger, and the refrigerant flows through the refrigerant flow path, in order to prevent the accumulation of deposits in the diffusion path, thereby preventing the passage of the refrigerant through the refrigerant flow path. The temperature rise of the compressed air in the air flow path in the casing is suppressed. In the structure disclosed in Patent Document 1, the compressor casing for a turbocharger is divided into a scroll member and a shroud member, and the refrigerant flow paths are defined by assembling the two members.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2018-184928

SUMMARY OF THE INVENTION

The problem to be solved by the invention

In the structure disclosed in Patent Document 1, the refrigerant flow path is prevented from leaking by using a seal portion formed by pressing the shroud member into the scroll member. Furthermore, in order to sufficiently improve the sealing performance of the sealing portion, it is conceivable to apply a sealing material to the sealing portion in the shroud member and the scroll member at the time of press-fitting. However, in order to apply the sealing material, pretreatment such as the sealing material and degreasing is also required, so that the cost is high and the workability is also poor. On the other hand, in order to reduce cost and improve workability, it is conceivable to form the seal portion only on the press-fitting surface where the shroud member is press-fitted into the scroll member without using a sealing material, but in this case, there is a possibility that the seal portion is formed Leakage failure occurs due to minute gaps that cause refrigerant leakage. Although leak failures are detected in post-assembly leak inspections and not released to the market, the result is higher costs due to lower yields.

On the other hand, in a compressor case for a turbocharger that does not have a refrigerant flow path, when the scroll member and the shroud member are separately formed and assembled by press-fitting, the two The press-fit part requires the improvement of sealing performance. In this case, if the sealing material is used as described above, it will lead to high cost and reduced workability.

The present invention has been made in view of such a problem, and an object thereof is to provide a compressor casing for a turbocharger that achieves improved sealing performance while reducing cost.

means to solve the problem

One aspect of the present invention relates to a compressor casing for a turbocharger that accommodates a compressor impeller, and the compressor casing for a turbocharger includes:

a suction port forming portion, which forms a suction port for sucking air toward the compressor impeller;

a shroud portion circumferentially surrounding the compressor wheel and having a shroud surface opposite the compressor wheel;

a diffuser that is formed on an outer peripheral side of the compressor impeller in the circumferential direction and forms a diffuser passage through which the compressed air ejected from the compressor impeller passes; and

a scroll chamber forming portion that forms a scroll chamber that guides the compressed air that has passed through the diffusion passage to the outside,

The compressor casing for a turbocharger is divided into a plurality of members including a scroll member including at least a part of the intake port forming portion and the scroll chamber forming portion, and a shroud member , which has at least a part of the swirl chamber forming part, a part of the diffuser part and the shroud part,

The scroll member and the shroud member are assembled to each other by press-fitting a press-fit portion provided on the shroud member into a press-fit portion provided on the scroll member, and when the scroll member and the shroud member are press-fitted, A crimped portion of one of the shroud members is crimped to a crimped portion provided on the scroll member and the other of the shroud member, and the crimped portion undergoes plastic flow to form a connection between the two. The sealing part between the seals.

Invention effect

According to the compressor casing for a turbocharger according to the above-described one aspect, the pressure-contact portion provided on the other of the scroll member and the shroud member is press-contacted by the press-contact portion provided on the other of the scroll member and the shroud member. The sealing portion between the scroll member and the shroud member is formed by plastic flow of the contact portion and the crimping portion. Thereby, since plastic flow occurs in the crimping portion in the sealing portion to fill the fine gap, the sealing performance can be improved as compared with the case where the sealing portion is formed only by pressing both of them. Furthermore, since application of a separate sealing material is unnecessary in the sealing portion, cost reduction can be achieved.

As described above, according to the present embodiment, it is possible to provide a compressor casing for a turbocharger that can improve sealing performance while reducing costs.

Description of drawings

FIG. 1 is a cross-sectional view of a compressor casing for a turbocharger in a first embodiment.

FIG. 2 is a conceptual diagram for explaining a method of manufacturing the compressor casing for a turbocharger in the first embodiment.

3 is a cross-sectional perspective view of the scroll member in the first embodiment.

FIG. 4 is a perspective view of the shield member in the first embodiment.

5 is a cross-sectional perspective view of the shield member in the first embodiment.

6 is an enlarged conceptual view of a main part for explaining a method of manufacturing the compressor casing for a turbocharger in the first embodiment.

FIG. 7 is an enlarged conceptual diagram of a main part for explaining a method of manufacturing the compressor casing for a turbocharger in the first embodiment.

8 is a cross-sectional view of a compressor casing for a turbocharger in a first modification.

9 is a conceptual diagram for explaining a method of manufacturing a compressor casing for a turbocharger in a first modification.

10 is a conceptual diagram for explaining a method of manufacturing a compressor casing for a turbocharger in a first modification.

11 is an enlarged conceptual diagram of a main part for explaining a method of manufacturing a compressor casing for a turbocharger in a second embodiment.

12 is an enlarged conceptual diagram of a main part for explaining a method of manufacturing a compressor casing for a turbocharger in a second embodiment.

Description of reference numerals

1: Compressor housing for turbocharger;

2: scroll member;

3: Shield member;

5: Refrigerant flow path;

51: the first refrigerant flow path forming part;

52: the second refrigerant flow path forming part;

53a: pressed-in part;

53b: press-in part;

541: inner peripheral sealing part;

541a: the inner circumference to be crimped;

541b: inner peripheral crimping part;

542: peripheral sealing part;

542a: peripheral crimped part;

542b: peripheral crimping part;

545, 547: Bevel at the start end;

546, 548: Terminal side bevel.

Detailed ways

In this specification, the "circumferential direction" refers to the rotational direction of the compressor impeller, the "axial direction" refers to the direction of the rotational axis of the compressor impeller, and the "radial direction" refers to a virtual direction centered on the rotational axis of the compressor impeller. The radial direction of the circle and the radially outer side refer to the direction of a straight line extending from the center of the virtual circle to the circumference.

The compressor casing for a turbocharger includes a refrigerant flow path formed in the circumferential direction along the diffuser portion and allowing the refrigerant that cools the diffuser portion to circulate,

The refrigerant flow path is formed as an annular space formed by a first refrigerant flow path formation portion and a second refrigerant flow path formation portion formed at opposing portions of the scroll member and the shroud member, respectively,

The sealing portion includes an inner circumferential sealing portion that seals the inner circumferential side of the refrigerant flow path, and an outer circumferential sealing portion that seals the outer circumferential side of the refrigerant flow path,

The inner peripheral seal portion is an inner peripheral pressure formed on the other of the scroll member and the shroud member by being crimped to an inner periphery of the scroll member and the shroud member by a crimped portion formed on the other of the scroll member and the shroud member. It is formed by plastic flow of the inner peripheral crimping part,

The outer peripheral seal portion is formed by crimping an outer peripheral crimping portion formed on the other of the scroll member and the shroud member by a crimped portion formed on the outer periphery of the scroll member and the shroud member. It is formed by plastic-flowing the outer peripheral crimping portion. According to this configuration, in the compressor casing for a turbocharger provided with the refrigerant flow path, the sealing performance of the inner peripheral seal portion and the outer peripheral seal portion of the refrigerant flow path can be improved while reducing the cost.

It is preferable that the said sealing part is located in the terminal end side of the press-fitting direction of the said press-fitting part. In this case, when the shroud member is assembled to the scroll member, after the press-fit portion is press-fitted, the press-contact portion is press-contacted to the press-contact portion, so that dispersion of the plastic flow portion in the seal portion can be prevented. Thereby, the sealing performance can be reliably improved.

Another aspect of this invention is the manufacturing method of the compressor casing for turbochargers described above, wherein,

The manufacturing method includes:

a die casting process in which the scroll member and the shroud member are formed by die casting;

A machining step in which the pressure-bonded portion is formed on one of the scroll member and the shroud member by machining, and is formed on the other of the scroll member and the shroud member the above-mentioned crimping portion; and

an assembling step in which the press-fit portion is press-fitted into the press-fit portion, the press-fit portion is press-contacted to the press-fit portion, and plastic flow occurs to form the seal portion, thereby assembling the shield member on the above-mentioned scroll member.

Thereby, the above-mentioned compressor casing for a turbocharger can be manufactured. In addition, since the crimping portion and the portion to be crimped are formed by machining in the machining process, the surface can be roughened to a certain extent compared with the surface of the casting by die casting, so it is easy to use in the assembly process. Plastic flow occurs in the crimping portion, and the sealing performance can be further improved.

Preferably, in the machining step, the crimping portion is machined to have a mountain shape protruding in the radial direction in a cross section including the rotating shaft of the compressor impeller, and to have a shape located in the press-fitting direction. A start-end side slope on the start-end side and a terminal-side slope on the terminal-end side in the press-in direction, and in the cross section, the angle of the acute-angle side of the angle formed by the terminal-side slope and the rotation axis is larger than the start-end slope and the rotation axis. The angle of the acute side of the formed angle. In this case, by machining in the machining step, in the crimping portion, the end-side slope is raised more than the start-end slope with respect to the rotation axis, so that the inclination angle of the start-side slope and the pressure-contact can be maintained. The width of the crimping portion is narrowed in the state of the protrusion amount of the portion. Thereby, in the assembling process, the plastic flow of the crimping portion is easily caused without deteriorating the assemblability. As a result, fine gaps can be filled more reliably in each sealing portion formed by the assembly process, and the sealing performance can be further improved. Alternatively, by narrowing the width of the crimping portion while maintaining the amount of plastic flow in the crimping portion, the dimensional tolerances of the crimping portion and the portion to be crimped can be eased during machining in the machining process. Productivity can be improved and cost reduction can be achieved.

【Example】

(first embodiment)

Hereinafter, an embodiment of the above-described compressor casing for a turbocharger will be described with reference to FIGS. 1 to 7 .

As shown in FIG. 1 , the compressor casing 1 for a turbocharger accommodates a compressor impeller 13 , and includes an intake port forming portion 10 , a shroud portion 20 , a diffuser portion 30 , and a scroll chamber forming portion 120 .

The intake port forming portion 10 forms an intake port 11 that draws air toward the compressor impeller 13 .

The shroud portion 20 surrounds the compressor impeller 13 in the circumferential direction and has a shroud surface 22 facing the compressor impeller 13 .

The diffuser 30 is formed on the outer peripheral side of the compressor impeller 13 in the circumferential direction, and has a diffuser passage 15 through which the compressed air discharged from the compressor impeller 13 passes.

The scroll chamber forming portion 120 forms the scroll chamber 12 that guides the compressed air that has passed through the diffusion passage 15 to the outside.

Furthermore, the compressor casing 1 for a turbocharger is divided into a plurality of members including the scroll member 2 and the shroud member 3 .

The scroll member 2 has at least a part of the intake port forming portion 10 and the scroll chamber forming portion 120 .

The shroud member 3 has at least a part of the swirl chamber forming part 120 , a part of the diffuser part 30 , and the shroud part 20 .

The scroll member 2 and the shroud member 3 are assembled to each other by press-fitting the press-fit portion 53 b provided in the shroud member 3 into the press-fit portion 53 a provided in the scroll member 2 . Furthermore, the crimping parts 541b and 542b provided in the shroud member 3 are crimped to the crimped parts 541a and 542a provided in the scroll member 2 and the crimping parts 541b and 542b are subjected to plastic flow, thereby forming a The sealing parts 541 and 542 are sealed between them.

Hereinafter, the compressor casing 1 for a turbocharger of this example will be described in detail.

As shown in FIG. 1 , the compressor casing 1 for a turbocharger is formed separately from a scroll member 2 and a shroud member 3 formed as independent members. Furthermore, the compressor casing 1 for a turbocharger is attached to a flange portion of a bearing casing (not shown) or a seal plate 40 when a split structure is adopted, and the bearing casing accommodates a compressor to which one end is attached. A bearing mechanism for pivotally supporting the shaft 14 of the impeller 13 .

As shown in FIGS. 2 and 3 , the scroll member 2 includes an intake port formation portion 10 , a first scroll chamber formation portion 121 , an outer peripheral portion 125 , and a first refrigerant flow passage formation portion 51 . As shown in FIG. 2 , the shroud member 3 includes the second scroll chamber forming portion 122 , the shroud portion 20 , the first diffusing portion 35 , and the second refrigerant channel forming portion 52 .

As shown in FIGS. 2 and 3 , the intake port forming portion 10 in the scroll member 2 has a cylindrical shape and is formed to penetrate in the axial direction Y. As shown in FIG. The first scroll chamber forming portion 121 constitutes a wall surface of the scroll chamber 12 on the intake side Y1 . As shown in FIG. 1 , the outer peripheral portion 125 is located on the opposite side Y2 of the first scroll chamber forming portion 121 opposite to the intake side Y1 , and forms the outer peripheral portion 125 of the turbocharger compressor casing 1 . Furthermore, the sealing plate 40 is attached to the inner side of the outer peripheral portion 125 .

As shown in FIG. 1 , the second scroll chamber forming portion 122 in the shroud member 3 forms a wall surface on the inner peripheral side of the scroll chamber 12 . The shroud portion 20 forms a shroud surface 22 facing the compressor impeller 13 . The first diffuser 35 forms a diffuser surface 34 extending from the shroud surface 22 toward the swirl chamber 12 . Furthermore, as shown in FIG. 2 , the outer peripheral edge of the front end of the intake side Y1 of the shroud member 3 is chamfered to form a third chamfered portion 591 .

As shown in FIGS. 1 and 2 , in the scroll member 2 , a press-fitted portion 53 a is provided on the opposite side Y2 of the intake port forming portion 10 , which is opposite to the intake side Y1 . As shown in FIG. 3, the to-be-pressed part 53a is formed as a cylindrical inner peripheral surface. Moreover, as shown in FIG. 1, the press-fit part 53b is provided in the suction side Y1 of the shroud member 3. As shown in FIG. As shown in FIGS. 4 and 5 , the press-fit portion 53b is formed as a cylindrical outer peripheral surface. Then, as shown in FIGS. 1 and 2 , the press-fit portion 53 b of the shroud member 3 is press-fitted into the inner side of the press-fit portion 53 a of the scroll member 2 , and the shroud member 3 is assembled to the scroll member 2 . The press-fit portion 53b is in contact with the press-fit portion 53a over the entire range in the circumferential direction. In addition, the amount of interference between the press-fit portion 53b and the press-fit portion 53a can be set to a range in which a desired anti-dropping load can be obtained without being damaged. In this example, the scroll member 2 and the shroud member 3 are made of aluminum alloy, and the interference between them is in the range of 40±20 μm.

As shown in FIG. 1 , by assembling the shroud member 3 to the scroll member 2 , the refrigerant is formed by the first refrigerant flow path forming portion 51 in the scroll member 2 and the second refrigerant flow path forming portion 52 in the shroud member 3 . flow path 5. As shown in FIG. 3 , the first refrigerant flow path forming portion 51 in the scroll member 2 is located inside the first scroll chamber forming portion 121 , and has a first wall surface 511 that is a wall surface on the suction side Y1 of the refrigerant flow path 5 . . In this example, the first wall surface 511 is formed as a flat surface perpendicular to the axial direction Y, but the first wall surface 511 may not necessarily be a flat surface, and may be a concave shape recessed toward the intake side Y1. Moreover, as shown in FIG. 2, the corner|angular part which connects the 1st wall surface 511 and the inner peripheral pressure contact part 541a mentioned later is chamfered, and the 1st chamfered part 581 is formed.

As shown in FIG. 1 , the second refrigerant flow path forming portion 52 in the shroud member 3 is provided on the intake side Y1 of the first diffuser 35 . As shown in FIG. 5 , the second refrigerant flow path forming portion 52 has a concave second wall surface 521 formed to be recessed toward the opposite side Y2 opposite to the suction side Y1. In this example, the second wall surface 521 has a U-shape in a cross section parallel to the axial direction Y, and as shown in FIG. As shown in FIG. 1 , the second refrigerant flow path forming portion 52 has a second contact surface 562 as a wall surface parallel to the radial direction on the radially outer side of the second wall surface 521 . As shown in FIG. 1 , the second contact surface 562 is in contact with the first contact surface 561 of the scroll member 2 . Further, as the refrigerant flow path 5 , an annular space 50 is formed that is constituted by a first refrigerant flow path formation portion 51 and a second refrigerant flow path formation portion 52 . The refrigerant flow path 5 is formed in the circumferential direction along the diffuser 30 , and circulates the refrigerant that cools the diffuser 30 . Further, as shown in FIG. 2 , a corner portion (the end portion on the Y2 side of the outer peripheral pressure-contacted portion 542a ) connecting the first contact surface 561 of the scroll member 2 and the outer peripheral pressure-contacted portion 542a to be described later is The second chamfered portion 582 is formed by chamfering.

As shown in FIG. 1 , in the refrigerant flow path 5 , the boundary portion between the first refrigerant flow path formation portion 51 and the second refrigerant flow path formation portion 52 is sealed by sealing portions 541 and 542 . The sealing portion 541 (542) is formed by crimping the crimping portion 541b (542b) to the crimping portion 541a (542a) and mainly plastically flowing the crimping portion 541b (542b). In this example, the sealing portions 541 and 542 include an inner peripheral sealing portion 541 that seals the inner peripheral side of the refrigerant flow passage 5 and an outer peripheral sealing portion 542 that seals the outer peripheral side of the refrigerant passage. The inner peripheral sealing portion 541 is composed of an inner peripheral crimped portion 541a and an inner peripheral crimped portion 541b, and the outer peripheral sealing portion 542 is composed of an outer peripheral crimped portion 542a and an outer peripheral crimped portion 542b.

As shown in FIG. 3 , in the inner peripheral seal portion 541, an inner peripheral pressure-contacted portion 541a is formed in the scroll member 2, and is a cylindrical inner peripheral surface located on the Y2 side of the press-fit portion 53a and continuous with the press-fit portion 53a . On the other hand, as shown in FIGS. 4 and 5 , the inner peripheral crimping portion 541b is formed in the shroud member 3 as a cylindrical outer periphery that is located on the Y2 side, which is the terminal end side of the pressing portion 53b in the pressing direction, and is continuous with the pressing portion 53b. noodle. Furthermore, in the state before assembly, the inner peripheral crimping portion 541b protrudes radially outward. The shape of the inner peripheral crimping portion 541b is not limited, but in this example, as shown in FIG. The rising portion of the inner peripheral crimping portion 541b protrudes radially outward and is formed in a gentle mountain shape that is smoothly connected in the front and rear of the axial direction Y. As shown in FIG. In addition, in this cross section, the apex in the protruding direction of the inner peripheral crimping portion 541b is also formed in a gently curved shape. Furthermore, as shown in FIG. 4 , the inner peripheral crimping portion 541b is continuous in the circumferential direction and has an annular shape.

As shown in FIG. 6( a ), in a cross-section including the rotating shaft 13 a in a state before assembly, the inner peripheral crimping portion 541 b protrudes radially outward from the press-fitting portion 53 b by a predetermined amount T1 relative to the pressure The entry portion 53b protrudes. The protrusion amount T1 is a range in which the inner peripheral crimping portion 541b can plastically flow, and can be set to, for example, 80 to 120 μm, and in this example, 100 μm. The length of the inner peripheral crimping portion 541b in the axial direction Y, that is, the formation range H1 of the inner peripheral crimping portion 541b in the axial direction Y is not particularly limited, and can be, for example, 0.5 to 1.5 mm, and in this example, 1.0 mm .

As shown in FIG. 6( a ), the inner peripheral crimping portion 541 b protrudes with respect to the press-fitting portion 53 b by a predetermined protrusion amount T1 , whereby, as shown in FIG. 6( c ), by placing the The press-fit portion 53b is press-fitted into the press-fitted portion 53a of the scroll member 2, and the inner peripheral press-contact portion 541b of the shroud member 3 is press-contacted to the inner peripheral press-fit portion 541a of the scroll member 2. Plastic flow occurs in the inner peripheral crimping portion 541b. Thereby, the fine gap between both is filled, and the inner peripheral sealing part 541 is formed. In addition, in this example, the inner peripheral crimping portion 541b is provided in the shroud member 3, and the inner peripheral crimped portion 541a is provided in the scroll member 2, but instead, the inner peripheral crimping portion 541a may be provided in the shroud member 3. A crimping portion 541 a is provided, and an inner peripheral crimping portion 541 b is provided on the scroll member 2 . However, it is preferable to provide the inner peripheral pressure-bonded portion 541a on the one with higher rigidity.

As shown in FIG. 7( a ), in the outer peripheral seal portion 542 , the outer peripheral crimping portion 542b also protrudes radially outward similarly to the inner peripheral crimping portion 541b. The protrusion amount T2 and the formation range H2 of the outer peripheral crimping portion 542b can also be set to be equivalent to the protrusion amount T1 and the formation range H1 of the inner peripheral crimping portion 541b, and are also the same in this example. Further, in the wall surface on which the outer peripheral crimping portion 542b is formed, the outer peripheral edge of the end portion of the intake side Y1 is chamfered to form a fourth chamfered portion 592 . Then, by press-fitting the press-fit portion 53b of the shroud member 3 into the press-fit portion 53a of the scroll member 2 , as shown in FIG. 7( c ), the outer peripheral press-contact portion 542b of the shroud member 3 is press-contacted to the scroll member 2 . The outer periphery of the member 2 is crimped by the portion 542a, and the outer periphery crimp portion 542b mainly causes plastic flow as indicated by the symbol M. Thereby, the fine gap between the two is filled, and the outer peripheral sealing portion 542 is formed. In addition, in this example, the outer peripheral crimping portion 542b is provided in the shroud member 3, and the outer peripheral crimping portion 542a is provided in the scroll member 2, but instead, the outer peripheral crimping portion may be provided in the shroud member 3 542a, and an outer peripheral crimping portion 542b is provided on the scroll member 2. As shown in FIG. However, it is preferable to provide the outer peripheral pressure-bonded portion 542a on the one with higher rigidity.

As shown in FIGS. 1 and 2 , the scroll member 2 includes a refrigerant supply portion 513 and a refrigerant discharge portion 514 that penetrate the first refrigerant flow path forming portion 51 and are formed of through holes communicating with the refrigerant flow path 5 . The refrigerant supply part 513 is configured to supply the refrigerant to the refrigerant flow path 5, and the refrigerant discharge part 514 is configured to discharge the refrigerant. In this example, as shown in FIG. 2 , the refrigerant supply portion 513 and the refrigerant discharge portion 514 are formed from the first wall surface 511 in parallel with the axial direction Y toward the intake side Y1, and are further formed radially outward.

As shown in FIG. 1 , the seal plate 40 has the third scroll chamber forming portion 123 , the seal plate insertion portion 41 , and the second diffuser portion 36 . The third scroll chamber forming portion 123 constitutes a wall surface on the outer peripheral side in the scroll chamber 12 . The sealing plate insertion portion 41 is inserted into the inner side of the outer peripheral portion 125 . The second diffuser 36 forms the diffuser 30 together with the first diffuser 35 . The second diffuser 36 has an opposing surface 37 that faces the diffuser surface 34 of the first diffuser 35 with a predetermined distance therebetween. Furthermore, the space between the diffusion surface 34 and the opposing surface 37 becomes the diffusion passage 15 . Further, as shown in FIG. 1 , there is a slight gap C between the first scroll chamber forming portion 121 of the scroll member 2 and the third scroll chamber forming portion 123 of the seal plate 40 so as not to interfere with each other. catch. Thereby, the sealing plate 40 is inserted to a predetermined position, and the diffusion passage 15 is formed to have a predetermined width.

Next, the manufacturing method of the compressor casing 1 for turbochargers of this example is demonstrated.

First, as shown in FIG. 2 , in the die-casting process, the scroll member 2 and the shroud member precursor 3 a which is a rough-machined material of the shroud member 3 are separately produced by die casting. Then, in the machining process, the press-fit portion 53 a , the inner peripheral press-contact portion 541 a , and the outer peripheral press-contact portion 542 a are formed on the scroll member 2 by machining, and the press-fit portion 53 b and the inner peripheral press-fit portion 53 b are formed on the shroud member 3 by machining. The contact portion 541b and the outer peripheral crimp portion 542b. Further, the cut portion 57 of the bottom of the second wall surface 521 is cut. In addition, the shield surface 22 is not formed in the shield member precursor 3a, and the inner surface 22a of the shield member precursor 3a is formed as a cylindrical surface.

Next, as shown by arrow P in FIG. 2 , in the assembly process, the shroud member 3 is assembled to the scroll member 2 . More specifically, in the inner peripheral seal portion 541 , as shown in FIG. 6( a ), first, as indicated by the arrow P, the press-fit portion 53 b of the shroud member 3 is directed toward the side of the scroll member 2 in the axial direction Y as shown by the arrow P. The inner peripheral crimped portion 541a is inserted into the inner peripheral crimped portion 541a, and as shown in FIG. 6(b), the press-fit portion 53b is pressed into the inner peripheral crimped portion 541a. Then, it is further inserted in the direction of the arrow P, and as shown in FIG. 6( c ), the press-fit portion 53 b is press-fitted to the press-fit portion of the scroll member 2 located on the intake side Y1 from the inner peripheral press-contact portion 541 a 53a. Accompanying this, the inner peripheral crimping portion 541b of the shroud member 3 comes into contact with the first chamfered portion 581 of the scroll member 2 , and the inner peripheral crimping portion 541b is mainly crimped along the inner periphery of the scroll member 2 . Plastic flow occurs in the portion 541a. Then, as shown in FIG. 6( c ), the inner peripheral crimping portion 541b and the inner peripheral crimped portion 541a of the scroll member 2 are brought into close contact with each other. Then, the second abutting surface 562 of the shroud member 3 is pressed into the first abutting surface 561 of the scroll member 2 , thereby completing the inner peripheral seal portion 541 .

In addition, in the outer peripheral seal portion 542 , similarly to the inner peripheral seal portion 541 , the press-fit portion 53 b of the shroud member 3 is pressed into the press-fitted portion 53 a of the scroll member 2 , as shown in FIG. 7( a ) 7(b), the outer peripheral crimping portion 542b of the shroud member 3 is in contact with the second chamfered portion 582 of the scroll member 2, and the outer peripheral crimping portion 542b is mainly formed along the scroll member 2. The outer peripheral crimped portion 542a undergoes plastic flow, and as shown in FIG. Thereby, the outer peripheral sealing portion 542 is completed. Then, as shown in FIG. 1 , the refrigerant flow path 5 as the annular space 50 sealed by the inner peripheral sealing portion 541 and the outer peripheral sealing portion 542 is formed. Then, the inner surface 22a is machined to form the shield surface 22 . Thereby, the compressor casing 1 for a turbocharger shown in FIG. 1 is manufactured.

Further, in the compressor casing 1 for a turbocharger, a refrigerant introduction pipe and a refrigerant, not shown, are connected to the refrigerant supply portion 513 and the refrigerant discharge portion 514 that communicate with the refrigerant flow path 5 shown in FIGS. 1 and 2 . The diffuser surface 34 can be cooled by allowing the refrigerant to flow through the discharge pipe through the refrigerant flow path 5 .

In addition, in this example, in the inner peripheral seal portion 541, the inner peripheral pressure-contacted portion 541a is provided in the scroll member 2, and the inner peripheral pressure-contact portion 541b is provided in the shroud member 3, but the scroll member may be provided in the inner peripheral pressure-contact portion 541b. 2. An inner peripheral crimping portion 541b is provided, and an inner peripheral crimped portion 541a is provided in the shield member 3. Similarly, in the outer peripheral seal portion 542 , the outer peripheral crimped portion 542 a is provided in the scroll member 2 and the outer peripheral crimped portion 542 b is provided in the shroud member 3 , but the outer peripheral crimped portion 542 b may be provided in the scroll member 2 . , and the outer peripheral crimped portion 542 a is provided on the shield member 3 . However, it is preferable to provide the to-be-crimped parts 541a and 542a on the one with higher rigidity.

Further, in this example, in order to prevent dispersion of the plastic flow portion, the press-fit portion 53 b is provided on the Y1 side of the inner peripheral press-contact portion 541 b in the shroud member 3 , and the press-fit portion 53 a is provided in the scroll member 2 However, instead of or at the same time, a press-fit portion may be formed on the Y1 side of the outer peripheral crimped portion 542b of the shroud member 3, and the inner circumference of the scroll member 2 may be formed on the Y1 side. A press-fitted portion is provided on the Y1 side of the press-bonded portion 541a.

Next, the effect of the compressor casing 1 for a turbocharger of this example will be described in detail.

According to the compressor casing 1 for a turbocharger of the present example, the seal portions 541 and 542 between the scroll member 2 and the shroud member 3 pass through the seal provided on one of the scroll member 2 and the shroud member 3 . The crimping portions 541a, 542a are formed by crimping the crimping portions 541b, 542b provided on the other side, and mainly by causing plastic flow of the crimping portions 541b, 542b. Thereby, in the sealing parts 541 and 542 , the pressure-bonding parts 541 b and 542 b are mainly caused to plastically flow to fill the fine gaps. Therefore, the sealing can be achieved compared with the case where the sealing parts are formed only by pressing both of them. Sexual enhancement. Further, since application of a separate sealing material is not required in the sealing portions 541 and 542, cost reduction can be achieved.

Moreover, in this example, the refrigerant|coolant flow path 5 which is formed in the circumferential direction along the diffuser part 30 and distribute|circulates the refrigerant|coolant which cools the diffuser part 30 is provided. The refrigerant flow path 5 is formed as an annular space constituted by a first refrigerant flow path formation portion 51 and a second refrigerant flow path formation portion 52 formed at opposing portions of the scroll member 2 and the shroud member 3, respectively. 50. The sealing portions 541 and 542 include an inner circumferential sealing portion 541 that seals the inner circumferential side of the refrigerant flow path 5 and an outer circumferential sealing portion 542 that seals the outer circumferential side of the refrigerant flow path 5 . The inner circumferential sealing portion 541 passes through The inner peripheral crimping portion 541a formed on the one of the scroll member 2 and the shroud member 3 is crimped to the inner peripheral crimping portion 541b formed on the other of the scroll member 2 and the shroud member 3, and is mainly used to make The inner peripheral crimping portion 541b is formed by plastic flow. The outer peripheral seal portion 542 is an outer peripheral crimping portion formed on the other of the scroll member 2 and the shroud member 3 by crimping the outer peripheral crimped portion 542 a formed on the scroll member 2 and the shroud member 3 . 542b and mainly formed by plastic flow of the outer peripheral crimping portion 542b. Thereby, in the compressor casing 1 for a turbocharger including the refrigerant flow path 5 , cost reduction can be achieved, and the sealing performance of the inner peripheral seal portion 541 and the outer peripheral seal portion 542 of the refrigerant flow path 5 can be improved.

In addition, in this example, the inner peripheral crimping portion 541b is located on the terminal end side Y2 in the pressing direction of the pressing portion 53b. In this way, when the shroud member 3 is assembled to the scroll member 2, the inner peripheral crimping portion 541b is press-contacted to the crimped portion 541a after the press-fitting portion 53b is press-fitted, so that it is possible to prevent the inner peripheral sealing portion 541 from getting stuck. The dispersion of the plastic flow part. Thereby, the sealing performance can be reliably improved.

Further, the compressor casing 1 for a turbocharger is formed separately and has a scroll member 2 and a shroud member 3, and the scroll chamber 12 is formed by assembling at least two members to each other. Thereby, the cross-sectional shape of the scroll chamber 12 can be made circular, and the scroll chamber forming portion 120 can be formed into a shape without undercut that can be released from the mold. As a result, the compression efficiency of the air supply can be improved, and it can be easily molded by die casting.

In addition, in this example, the compressor casing 1 for a turbocharger has a two-member structure composed of the scroll member 2 and the shroud member 3, but it may be formed as a first modification shown in FIG. 8 . A three-member structure consisting of a scroll member 2 , a shroud member 3 and an outer peripheral annular member 4 . The outer peripheral annular member 4 has an annular shape, and has a third scroll chamber forming portion 123 and an outer peripheral annular member insertion portion 410 . The outer peripheral annular member insertion portion 410 is press-fitted into the outer peripheral portion 125 to form the press-fit portion 42 . In addition, in this 1st modification, the same code|symbol is attached|subjected to the component equivalent to 1st Example, and the description is abbreviate|omitted.

Hereinafter, a method for manufacturing the compressor casing 1 for a turbocharger according to the first modification will be described. First, as shown in FIG. 9 , the scroll member 2 is die-cast in the same manner as in the first embodiment. Further, die casting is performed on the integral member 3b in which the outer peripheral portion of the shroud member 3 in the first embodiment and the inner peripheral portion of the outer peripheral annular member 4 having the outer shape of the outer peripheral annular member 4 are connected via the connecting portion 4a to form an integral member 3b. take shape. Then, the press-fit portion 53a, the inner peripheral press-contact portion 541a, and the outer peripheral press-contact portion 542a are formed in the scroll member 2 by machining, and the press-fit portion 53b, the inner peripheral press-contact portion 541b, and the outer peripheral press portion are formed in the shroud member 3 by machining. The connecting portion 542b. Further, the cut portion 57 of the bottom of the second wall surface 521 is cut. After that, the press-fit portion 53b of the integral member 3b is press-fitted into the press-fitted portion 53a of the scroll member 2 in the direction of the arrow P, and the inner peripheral press-contact portion 541b and the outer peripheral press-contact portion 542b of the integral member 3b are press-contacted to the scroll member. The inner peripheral crimped portion 541a and the outer peripheral crimped portion 542a of the Then, the connecting portion 4 b shown in FIG. 10 is cut, and the shroud member 3 and the outer peripheral annular member 4 are separated from each other in a state in which they are press-fitted into the scroll member 2 . Thereby, the compressor casing 1 for a turbocharger of the first modification shown in FIG. 8 is produced.

Also in the compressor casing 1 for a turbocharger of the first modification, the same functions and effects as those of the first embodiment are exhibited. Furthermore, it is preferable that the interference amount of the press-fit portion 42 formed by press-fitting the outer peripheral annular member 4 is smaller than the interference amount of the press-fit portion 53b. In this case, the work of press-fitting the integral member 3b into the scroll member 2 can be easily performed. In addition, the coaxial deviation of the press-fit portion 53b of the shroud member 3 and the press-fit portion 42 of the outer peripheral annular member 4 can be absorbed.

In addition, in the compressor casing 1 for a turbocharger according to the first modification, as shown in FIGS. 8 and 10 , the portion of the integral member 3 b that becomes the outer peripheral annular member 4 is axially offset from the scroll member. 2 is brought into contact to form a gap B. Therefore, when the integral member 3b is press-fitted, the first contact surface 561 and the second contact surface 562 can be brought into contact with each other. Thereby, the axial direction press-fitting position of the integrated member 3b can be determined more accurately. That is, the final axial positioning of the shroud member 3 can be performed with higher accuracy.

(Second Embodiment)

In the above-described first embodiment, as shown in FIG. 6( a ), in the state before assembly, the inner peripheral crimping portion 541 b is radially oriented in the cross section including the rotating shaft 13 a of the compressor impeller 13 . It protrudes and has a mountain shape, and the start-end slope at the start-end side in the pressing-in direction and the terminal-side slope at the end in the pressing-in direction form a symmetrical shape centered on the apex of the mountain shape, and the slope angles of the slopes correspond to each other. In addition, in the above-described first embodiment, as shown in FIG. 7( a ), in the state before assembly, the outer peripheral crimping portion 542b is also the same as the inner peripheral crimping portion 541b.

In the second embodiment, instead, as shown in FIG. 11 , in the state before assembly, the inner peripheral crimping portion 541b protrudes in the radial direction X in the cross section including the rotating shaft 13a of the compressor impeller 13 On the other hand, it is in the shape of a mountain and has a start end side slope 545 located on the start end side (in this example, the suction side Y1) in the pressing direction, and the end side (in this example, the opposite side Y2 opposite to the suction side Y1) in the pressing direction. Terminal side bevel 546 . In this cross section, the angle θ2 on the acute side of the angle formed by the end-side inclined surface 546 and the rotation shaft 13a is larger than the angle θ1 on the acute-angle side of the angle formed by the start-end side inclined surface 545 and the rotation shaft 13a. In addition, the formation range H3 of the inner peripheral crimping part 541b shown in FIG. 11 is smaller than the formation range H1 in 1st Example shown in FIG.6(a). In this example, the protrusion amount T1 of the inner peripheral crimping portion 541b shown in FIG. 11 corresponds to the case of the first embodiment. In addition, the rotating shaft 13a shown in FIG. 11 has moved in parallel to the vicinity of the inner peripheral crimping portion 541b in this figure, and does not indicate the actual position of the rotating shaft 13a, but θ1 in FIG. 11 is relative to the start-end side slope 545 The angle on the acute-angle side of the actual rotation shaft 13a matches, and θ2 in FIG. 11 matches the angle of the terminal-side slope 546 with respect to the acute-angle side of the actual rotation shaft 13a.

The angle θ1 on the acute-angle side of the angle formed by the start-end side slope 545 and the rotating shaft 13a shown in FIG. 11 can be set to, for example, 5 to 15°, and 10° in this example. In addition, the angle θ2 on the acute-angle side of the angle formed by the terminal-side inclined surface 546 and the rotation shaft 13a shown in FIG. 11 can be set to, for example, 30 to 60°, and 45° in this example. Both θ1 and θ2 are formed to be constant over the entire circumferential direction.

In addition, as shown in FIG. 12 , in the state before assembly, similarly to the inner peripheral crimping portion 541b, the outer peripheral crimping portion 542b also protrudes in the radial direction X in the cross section including the rotating shaft 13a to have a mountain shape, and has a A start-end slope 547 on the start-end side in the pressing-in direction (in this example, the suction side Y1) and a terminal-side slope 548 on the end-side in the pressing-in direction (the opposite side Y2 opposite to the suction side Y1 in this example). In this cross section, the angle θ4 on the acute side of the angle formed by the end-side inclined surface 548 and the rotation shaft 13a is larger than the angle θ3 on the acute-angle side of the angle formed by the start-end side inclined surface 547 and the rotation shaft 13a. In addition, the formation range H4 of the outer peripheral crimping part 542b shown in FIG. 12 is smaller than the formation range H2 in 1st Example shown in FIG.7(a). Furthermore, the protrusion amount T2 of the outer peripheral crimping portion 542b shown in FIG. 12 is equivalent to that of the first embodiment. In addition, the rotation shaft 13a shown in FIG. 12 is moved in parallel to the vicinity of the outer peripheral crimping portion 542b in this figure, and does not indicate the actual position of the rotation shaft 13a, but θ3 and the start-end side slope 547 in FIG. 12 are relative to the actual position The angle of the acute-angle side of the rotation shaft 13a of 12 is the same, and θ4 in FIG. 12 is the same as the angle of the terminal-side slope 548 with respect to the acute-angle side of the actual rotation shaft 13a.

The angle θ3 on the acute side of the angle formed by the start-end side slope 547 and the rotation shaft 13a shown in FIG. 12 can be set to 5 to 15°, for example, 10° in this example, similarly to θ1. In addition, the angle θ4 on the acute side of the angle formed by the terminal-side inclined surface 548 and the rotation shaft 13a can be set to 30 to 60°, for example, 45° in this example, similarly to θ2. Both θ3 and θ4 are formed to be constant over the entire circumferential direction. In addition, other structures in this example are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are assigned and the description thereof will be omitted.

Next, a method of manufacturing the compressor casing 1 for a turbocharger according to the second embodiment will be described.

First, a die casting process is performed in the same manner as in the case of the first embodiment shown in FIG. 2 , and the scroll member 2 and the shroud member precursor 3 a are separately produced by die casting. Then, the machining process is also performed in the same manner as in the case of the first embodiment. However, in the machining process of this example, as shown in FIGS. 11 and 12 , the inner peripheral crimping portion 541b and the outer peripheral crimping portion 542b are machined to have a mountain shape protruding in the radial direction, The starting end side slopes 545 and 547 of the start end side Y1 in the inward direction and the terminal end side slopes 546 and 548 located on the end side Y2 in the pressing direction, and in this cross section, the acute angle of the angle formed by the end end side slopes 546 and 548 and the rotation shaft 13a The side angles θ2 and θ4 are larger than the angles θ1 and θ3 on the acute-angle side of the angle formed by the start-end side slopes 545 and 547 and the rotation shaft 13a. Furthermore, in this example, as described above, θ1 and θ3 are set to 10°, and θ2 and θ4 are set to 45°. After that, an assembly process is performed in the same manner as in the first embodiment, and the inner peripheral crimping portion 541b and the outer peripheral crimping portion 542b are plastically flowed to form the inner peripheral sealing portion 541 and the outer peripheral sealing portion 542 . Thereby, the refrigerant flow path 5 is formed. Then, the inner surface 22a is machined to form the shroud surface 22, and the compressor casing 1 for a turbocharger is manufactured.

According to the compressor casing 1 for a turbocharger of the second embodiment, the same functions and effects as in the case of the above-described first embodiment are obtained. Furthermore, in the manufacturing method of the compressor casing 1 for a turbocharger of the present example, in the machining step, the crimping portions 541b and 542b are machined so as to be radially formed in the cross section including the rotating shaft 13a. In the shape of a mountain that protrudes in the direction of insertion, it has start-end side slopes 545 and 547 on the start-end side in the pressing-in direction and terminal-side sloped surfaces 546 and 548 on the end-side slope in the pressing-in direction. The side angles θ2 and θ4 are larger than the angles θ1 and θ3 on the acute-angle side of the start-end side slopes 545 and 547 . Thereby, in the crimping parts 541b and 542b, the end-side inclined surfaces 546 and 548 are raised more than the start-end side inclined surfaces 545 and 547 with respect to the rotating shaft 13a by machining in the machining process. While the inclination angles θ1 and θ3 of the start-end side slopes 545 and 547 and the protruding amounts T1 and T2 of the crimping portions 541b and 542b are maintained to be equivalent to those in the case of the first embodiment, the formation range of the crimping portions 541b and 542b is set to ( That is, the width) H3 and H4 are narrowed. Thereby, it becomes easy to generate plastic flow in the crimping parts 541b and 542b without deteriorating the assemblability in the assembling process. As a result, the fine gaps in each of the sealing parts 541 and 542 can be filled more reliably, and the sealing performance can be further improved. Alternatively, when the amount of plastic flow of the crimping parts 541b and 542b is made the same as that of the first embodiment, by narrowing the widths H3 and H4 of the crimping parts, it is possible to ease the crimping during machining in the machining process. Since the dimensional tolerances of the parts 541b and 542b and the parts to be crimped 541a and 542a can be improved, productivity can be improved and cost reduction can be achieved.

In this example, the inner circumferential crimping portion 541b is provided on the shroud member 3, and the inner circumferential crimping portion 541a is provided on the scroll member 2, but instead, the inner circumferential crimping portion 541a may be provided on the shroud member 3. The scroll member 2 is provided with an inner peripheral crimping portion 541b. In addition, in this example, the outer peripheral crimping portion 542b is provided in the shroud member 3, and the outer peripheral crimping portion 542a is provided in the scroll member 2, but instead, the outer peripheral crimping portion may be provided in the shroud member 3 542a, and an outer peripheral crimping portion 542b is provided on the scroll member 2. As shown in FIG. In either case, it is preferable to provide the inner peripheral crimped portion 541a and the outer peripheral crimped portion 542a on a member with high rigidity.

In addition, in this example, as shown in FIGS. 11 and 12 , since the inner peripheral crimping portion 541b and the outer peripheral crimping portion 542b are provided in the shroud member 3, the start-end side slopes 545 and 547 are located on the intake side Y1, And the terminal side slopes 546 and 548 are located in the opposite side Y2. On the other hand, when the scroll member 2 is provided with the inner peripheral crimping portion 541b and the outer peripheral crimping portion 542b, the suction side Y1 is the end side in the pressing direction, and the opposite side Y2 is the starting end side in the pressing direction. The end side slopes 546 and 548 are located on the suction side Y1, and the start end side slopes 545 and 547 are located on the opposite side Y2.

In addition, in this example, the start end side slopes 545 and 547 and the end end side slopes 546 and 548 are linear in the cross section including the rotation shaft 13a, but may not be strictly linear in the cross section including the rotation axis 13a. Slightly curved shape.

The present invention is not limited to the above-described embodiments and modifications, and can be applied to various embodiments and modifications without departing from the gist of the present invention.

Claims (5)

1. A compressor casing for a turbocharger containing a compressor impeller, wherein, The compressor housing for a turbocharger includes: a suction port forming portion, which forms a suction port for sucking air toward the compressor impeller; a shroud portion circumferentially surrounding the compressor wheel and having a shroud surface opposite the compressor wheel; a diffuser that is formed on an outer peripheral side of the compressor impeller in the circumferential direction and forms a diffuser passage through which the compressed air ejected from the compressor impeller passes; and a scroll chamber forming portion that forms a scroll chamber that guides the compressed air that has passed through the diffusion passage to the outside, The compressor casing for a turbocharger is divided into a plurality of members including a scroll member including at least a part of the intake port forming portion and the scroll chamber forming portion, and a shroud member , which has at least a part of the swirl chamber forming part, a part of the diffuser part and the shroud part, The scroll member and the shroud member are assembled to each other by press-fitting a press-fit portion provided on the shroud member into a press-fit portion provided on the scroll member, and when the scroll member and the shroud member are press-fitted, A crimped portion of one of the shroud members is crimped to a crimped portion provided on the scroll member and the other of the shroud member, and the crimped portion undergoes plastic flow to form a connection between the two. The sealing part between the seals. 2. The compressor housing for a turbocharger according to claim 1, wherein: The compressor casing for a turbocharger includes a refrigerant flow path that is formed in the circumferential direction along the diffuser portion and circulates a refrigerant that cools the diffuser portion, The refrigerant flow path is formed in an annular shape including a first refrigerant flow path formation portion and a second refrigerant flow path formation portion formed at opposing portions of the scroll member and the shroud member, respectively. Space, The sealing portion includes an inner circumferential sealing portion that seals the inner circumferential side of the refrigerant flow path, and an outer circumferential sealing portion that seals the outer circumferential side of the refrigerant flow path, The inner circumference seal portion is formed in the scroll member and the shroud member by crimping the inner circumference of the other of the scroll member and the shroud member by a crimped portion formed on the other of the scroll member and the shroud member. One inner peripheral crimping part is formed by plastic flow of the inner peripheral crimping part, The outer peripheral seal portion is formed in the other of the scroll member and the shroud member by being crimped to an outer periphery of the scroll member and the shroud member by a crimped portion formed on the other of the scroll member and the shroud member. The outer peripheral crimping portion is formed by plastically flowing the outer peripheral crimping portion. 3 . The compressor case for a turbocharger according to claim 1 , wherein the seal portion is located on a terminal end side in the press-fitting direction of the press-fitting portion. 4 . 4 . A method for producing a compressor casing for a turbocharger, wherein the method for producing a compressor casing for a turbocharger according to claim 1 , wherein The manufacturing method includes: a die casting process in which the scroll member and the shroud member are formed by die casting; a machining step in which the press-bonded portion is formed on one of the scroll member and the shroud member by machining, and the scroll member and the shroud the other of the members forms the crimp; and An assembling process, in which the press-fit portion is press-fitted into the press-fit portion, the press-fit portion is press-contacted to the press-fit portion, and plastic flow occurs to form the seal portion, thereby forming the seal portion. The shroud member is assembled to the scroll member. 5 . The method of manufacturing a compressor casing for a turbocharger according to claim 4 , wherein, in the machining step, the crimping portion is machined so as to be formed on a surface including the compressor impeller. 6 . In the cross section including the rotating shaft, it is in the shape of a mountain protruding in the radial direction, and has a start end side slope on the start end side in the press-fitting direction and a terminal side slope on the end side in the press-fit direction, and in the cross section, the The angle of the acute-angle side of the angle formed by the terminal-side inclined surface and the rotation axis is larger than the angle of the acute-angle side of the angle formed by the start-end-side inclined surface and the rotation axis.

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