JPWO2016136681A1 - Compressor housing for supercharger and method for manufacturing the same - Google Patents

Abstract

  To provide a compressor housing for a supercharger which can prevent a reduction in compression efficiency, maintain a holding force for a sliding member, and is advantageous in terms of cost, and a method for manufacturing the same. The compressor housing (1) for a supercharger includes a housing body (20) that houses an impeller (10), and an annular sliding member (30) that forms a shroud surface (31). The sliding member (30) includes a flange portion (32) protruding outward in the radial direction, and is disposed in an inner peripheral recess (21) formed on the inner peripheral surface of the housing body (20). Furthermore, the ring-shaped member (40) formed in a ring shape along the inner peripheral recess (21) is press-fitted into the inner peripheral recess (21), whereby the front side surface (41) of the ring-shaped member (40) in the press-fitting direction. ) And the recessed portion facing surface (213) of the inner peripheral recessed portion (21) opposite to this, the flange portion (32) is fixed by being sandwiched.

Description

  The present invention relates to a compressor housing for a supercharger and a method for manufacturing the same.

  A compressor (compressor) used in a turbocharger of an automobile turbocharger is configured to be able to accommodate an impeller, and is formed in the circumferential direction on the outer peripheral side of the impeller, and an intake port that sucks air toward the impeller And a compressor housing having a scroll chamber for introducing the air discharged from the impeller and a shroud surface facing the impeller.

In the compressor having the above-described configuration, the compression efficiency of the compressor can be increased by making the gap between the impeller blade and the shroud surface of the compressor housing as small as possible.
However, if this gap is reduced, the impeller may be damaged when the blades of the impeller come into contact with the shroud surface of the compressor housing, for example, due to vibration or vibration of the impeller rotation shaft.

Therefore, a structure in which a sliding member made of a resin softer than an impeller blade is attached to a portion of the compressor housing that forms the shroud surface has been proposed (Patent Document 1).
According to this, even if the blade of the impeller contacts the shroud surface of the compressor housing due to vibration or the swing of the impeller rotating shaft, the sliding member attached to the portion that forms the shroud surface is only scraped. Without any breakage, the clearance between the impeller blades and the shroud surface of the compressor housing remains small.

JP-A-9-170442

  However, in Patent Document 1, in order to fix the sliding member to the shroud portion, the sliding member is expanded to the diffuser portion that does not face the impeller, and is fastened and fixed by the screw member through the screw hole provided in the diffuser portion. Yes. And the accommodation recessed part which accommodates the head of a screw member is provided in the diffuser surface of the sliding member so that the head of a screw member may not protrude from the diffuser surface in a sliding member to a fluid channel | path. However, since the storage recess is open to the fluid passage, it affects the intake air flowing through the fluid passage, thereby disturbing the flow of the air flow and reducing the compression efficiency.

  Moreover, there is a concern that accumulation of water or the like in the storage recess may be one of the causes of corrosion. Therefore, it is conceivable that after the head of the screw member is stored in the storage recess, the storage recess is filled with a putty or the like. However, according to this, there are disadvantages such as an increase in manufacturing steps and an increase in material costs.

  Moreover, since the sliding member is expanded to the diffuser part which is an area | region which does not oppose an impeller in order to ensure the area | region which fixes a screw member to a sliding member, a sliding member will enlarge comparatively. The material for forming the sliding member is generally more expensive than the material for forming the compressor housing. Therefore, if the sliding member is enlarged, it is disadvantageous in terms of cost.

  The present invention has been made in view of such conventional problems, and it is possible to prevent a reduction in compression efficiency, maintain a holding force for the sliding member, and provide a compressor housing for a turbocharger that is advantageous in cost. The manufacturing method is intended to be provided.

One aspect of the present invention is configured to be capable of accommodating an impeller, and has a housing body in which a concave inner peripheral recess is formed on an inner peripheral surface forming an annular shape along the outer periphery of the impeller;
An annular sliding member that is disposed in the inner circumferential recess and whose inner circumferential surface forms a shroud surface facing the impeller;
A ring-shaped member that is formed in a ring shape along the inner peripheral surface of the housing body and that is press-fitted into the inner peripheral recess along the axial direction of the impeller;
With
The inner circumferential recess includes a recess press-contact surface that is along the press-fitting direction of the ring-shaped member and is pressed against the radially outer surface of the ring-shaped member, and a concave-facing surface that faces the front side surface of the ring-shaped member in the press-fitting direction. Have
The sliding member has a flange that protrudes radially outward of the sliding member;
A compressor housing for a supercharger, wherein the flange is sandwiched between the front side surface in the press-fitting direction and the concave-facing surface when the ring-shaped member is press-fitted into the inner circumferential concave portion. It is in.

Another aspect of the present invention is a method of manufacturing a compressor housing for the supercharger,
An integrated coarse material forming step of forming an integral coarse material by integrally forming a housing coarse material that is a coarse material of the housing body and a ring-shaped coarse material that is a coarse material of the ring-shaped member;
Processing and dividing the integrated coarse material to form the housing main body and the ring-shaped member;
A compressor housing manufacturing method for a supercharger.

  According to the compressor housing for a supercharger, since the sliding member is fixed via the flange portion, a screw member for fixing the sliding member becomes unnecessary. Therefore, the conventional storage recess provided to prevent a part of the screw member from protruding from the diffuser surface to the fluid passage is also unnecessary. Thereby, in the shroud surface of a sliding member, the flow of the air discharged from the impeller is not disturbed, and a reduction in compression efficiency can be prevented.

  Further, according to the compressor housing for a supercharger, the ring-shaped member is press-fitted into the inner peripheral recess of the housing main body, so that the flange portion of the sliding member is depressed in the press-fitting direction front side surface of the ring-shaped member and the inner peripheral recess. It is clamped by the opposing surface.

  Further, since it is not necessary to provide a conventional storage recess on the diffuser surface, water does not accumulate on the diffuser surface, and there is no concern about corrosion. In addition, since the conventional process of filling the recess with a putty or the like is not required, the material cost does not increase. In addition, since it is not necessary to expand the sliding member to the diffuser portion, which is a region not facing the impeller, in order to secure a region for fixing the screw member to the sliding member, the sliding member can be reduced in size, which is advantageous in terms of cost. Become.

  According to the method for manufacturing a compressor housing for a supercharger, it is possible to manufacture a compressor housing for a supercharger that exhibits the above-described effects. Furthermore, in the integrated coarse material forming step, an integrated coarse material in which a housing coarse material that is a coarse material of the housing body and a ring-shaped coarse material that is a coarse material of the ring-shaped member are integrally formed is formed. In the process dividing step, after processing the integrated coarse material, it is divided into a housing body and a ring-shaped member to form both. That is, the ring-shaped member can be processed and divided in the process of processing the housing body. Thereby, a manufacturing process can be simplified compared with the case where both coarse materials are produced separately and processed individually.

  Further, since the housing body and the ring-shaped member are respectively formed from the housing coarse material and the ring-shaped coarse material cut out from the integrated coarse material, the housing body and the ring-shaped member are made of the same forming material. Therefore, since the linear thermal expansion coefficients of both are equal, even if thermal expansion / shrinkage occurs in both due to temperature change, the pressure contact portion between the radially outer surface of the ring-shaped member and the concave pressure contact surface of the inner peripheral recess It is possible to prevent a decrease in pressure contact force. Thereby, the press-fit state of the ring-shaped member with respect to the internal peripheral recessed part of a housing main body can be maintained. As a result, even if a temperature change occurs, a decrease in the holding force with respect to the sliding member in the inner peripheral recess of the housing body is prevented.

  As described above, according to the present invention, it is possible to provide a compressor housing for a supercharger that can prevent a reduction in compression efficiency, maintain a holding force for a sliding member, and is advantageous in terms of cost, and a method for manufacturing the same. Can do.

1 is a cross-sectional view of a turbocharger including a compressor housing for a supercharger in Embodiment 1. FIG. The partial enlarged view of the sliding member in FIG. The III-III position sectional view of the compressor housing for superchargers in FIG. Sectional drawing explaining the integral coarse material formation process in the manufacturing method of the compressor housing for superchargers in Example 1. FIG. Sectional drawing explaining the rough material process division | segmentation process in the manufacturing method of the compressor housing for superchargers in Example 1. FIG. Sectional drawing explaining the press injection process in the manufacturing process of the compressor housing for superchargers in Example 1. FIG. Sectional drawing explaining the shroud surface formation process in the manufacturing process of the compressor housing for superchargers in Example 1. FIG. Sectional drawing of the compressor housing for superchargers after the shroud surface formation process in Example 1. FIG. Sectional drawing of the integral coarse material in a modification.

  The compressor housing for a supercharger of the present invention can be used for a supercharger such as an automobile turbocharger.

  In the compressor housing for the supercharger, it is preferable that the ring-shaped member is made of the same material as that for forming the housing body. As a result, the linear expansion coefficients of both are equal, and even if thermal expansion and contraction occur in both, the pressure contact force at the pressure contact portion between the radially outer surface of the ring-shaped member and the recess pressure contact surface of the inner circumferential recess is reduced. Can be prevented. Thereby, the press-fitted state of the ring-shaped member with respect to the inner peripheral recess of the housing body can be sufficiently maintained. As a result, even if the temperature changes, the holding force against the sliding member in the inner peripheral recess of the housing body is sufficiently prevented.

  In the compressor housing for the supercharger, the flange portion may be formed on the entire circumference of the sliding member. In this case, the sliding member is fixed by holding the flange provided over the entire circumference of the sliding member between the front side surface of the ring-shaped member in the press-fitting direction and the concave facing surface of the inner peripheral concave portion of the housing body. Therefore, it is possible to ensure a sufficient holding force for the sliding member.

  In the compressor housing for the supercharger, the sliding member has the flange at the first end in the axial direction, and the second end opposite to the first end is at the inner circumferential recess. It is preferable that the second end portion is spaced from the end facing surface. When the sliding member is inserted into the inner circumferential recess from the second end with the second end as the front side and the first end formed with the flange as the rear, the second end of the sliding member is inward. If it contacts the end facing surface of the circumferential recess, the expansion of the sliding member toward the second end is restricted, and the amount of expansion toward the first end increases. As a result, the diffuser passage becomes narrow. However, in the said structure, while providing a collar part in the 1st end part near a diffuser channel | path, the 2nd end part is spaced apart from the edge part opposing surface of an internal peripheral recessed part. Thereby, expansion | swelling to the 2nd end part side of a sliding member is accept | permitted, and the expansion amount to the 1st end part side of a sliding member can be made small. As a result, it is possible to prevent the diffuser passage from becoming narrow.

  In the compressor housing for the supercharger, it is preferable that the outer peripheral surface of the sliding member is separated from the outer peripheral surface of the inner peripheral recess. In this case, a space is formed between the sliding member and the inner peripheral recess. And when a sliding member swells, the outer peripheral surface of a sliding member will swell in the said space part. Thereby, when a sliding member swells, it can prevent that a sliding member reduces in diameter. As a result, it is not necessary to increase the tip clearance between the sliding member and the impeller in advance in consideration of the reduced diameter due to the swelling of the sliding member, and the tip clearance can be reduced from the beginning. In addition, when assembling the sliding member with the ring-shaped member attached to the housing body, the sliding member can be inserted into the inner peripheral recess without the outer peripheral surface of the sliding member contacting the outer peripheral surface of the inner peripheral recess. Workability is improved.

  In the method of manufacturing the compressor housing for the supercharger, in the integrated coarse material forming step, the ring-shaped coarse material is along a position corresponding to a position where the ring-shaped member is press-fitted in the housing coarse material. It can be formed integrally with the housing coarse material. Thereby, it is not necessary to prepare a casting mold for molding the housing coarse material and a casting mold for molding the ring-shaped coarse material separately, and a casting mold for molding the integral coarse material of both may be prepared. . Therefore, the mold cost can be reduced. In addition, casting costs can be reduced by casting them together rather than casting them separately. As a result, the manufacturing cost can be reduced.

  In the compressor housing manufacturing method for the supercharger, in the integrated coarse material forming step, the ring-shaped coarse material is formed on the opposite side of the housing coarse material from the side on which the ring-shaped member is press-fitted. It can be integrally formed with the housing rough material along the end of the mouth. Also in this case, since the die cost and the casting cost can be reduced as described above, the manufacturing cost can be reduced.

Example 1
The compressor housing for the supercharger of this example will be described with reference to FIGS.
The turbocharger compressor housing 1 (hereinafter also referred to as “compressor housing 1”) of the present example includes a housing body 20, a sliding member 30, and a ring-shaped member 40 as shown in FIG.
The housing body 20 is configured to be able to accommodate the impeller 10, and a concave inner peripheral recess 21 is formed on the inner peripheral surface forming an annular shape along the outer periphery 10 a of the impeller 10.
The sliding member 30 is formed in an annular shape and is disposed in the inner peripheral recess 21, and the inner peripheral surface forms a shroud surface 31 that faces the impeller 10.
The ring-shaped member 40 is formed in a ring shape along the inner peripheral recess 21 of the housing body 20 and is press-fitted into the inner peripheral recess 21 along the axial direction X of the impeller 10.

Further, as shown in FIG. 2, the inner circumferential recess 21 is a recess press-contact surface 212 that is along the press-fitting direction (that is, the axial direction X) of the ring-shaped member 40 and press-contacted to the radially outer surface 42 of the ring-shaped member 40. And a recessed portion facing surface 213 facing the front side surface 41 of the ring-shaped member 40 in the press-fitting direction.
The sliding member 30 has a flange 32 protruding outward in the radial direction of the sliding member 30, and the ring-shaped member 40 is press-fitted into the inner peripheral concave portion 21, whereby the press-fitting direction front side surface 41 and the concave facing surface 213. A collar 32 is sandwiched between the two.

  As shown in FIG. 1, the compressor housing 1 forms an outer shell of a compressor (compressor) used in a turbocharger (supercharger) of an automobile.

Hereinafter, the compressor housing 1 of this example will be described in detail.
The housing body 20 is made of an aluminum gravity cast product, and includes an intake port 11, an intake passage 12, and a scroll chamber 13, as shown in FIGS.
The intake port 11 and the intake passage 12 are formed by a cylindrical portion 23 having a cylindrical shape. The scroll chamber 13 is formed in the circumferential direction on the outer peripheral side of the impeller 10 and is configured to introduce the air discharged from the impeller 10.

  The inner peripheral recess 21 is formed along the outer periphery of the sliding member 30 on the inner peripheral surface of the housing body 20. And the inner periphery recessed part 21 is along the cylindrical 1st recessed part 210 formed concavely along the cylindrical sliding member main-body part 310 in the below-mentioned sliding member 30, and the enlarged diameter part 311 in the sliding member 30. And a cylindrical second recess 220 formed in a concave shape from the first recess 210. Thereby, the inner periphery recessed part 21 is comprised so that the sliding member 30 can be arrange | positioned. In the second concave portion 220 of the inner peripheral concave portion 21, a concave portion press-contact surface 212 that is in press-contact with the radial outer surface 42 of the ring-shaped member 40 along the press-fit direction X of the ring-shaped member 40 described later, and the ring-shaped member 40 It has the recessed part opposing surface 213 extended in radial direction so that the surface (pressing direction front side surface) 41 which forms the pressing direction X front side may be opposed.

  The sliding member 30 is formed of an elastically deformable member. In this example, the sliding member 30 is made of polyimide resin. The material for forming the sliding member 30 is not limited to this, and Teflon (registered trademark), PPS (polyphenylene sulfide) resin, PEEK (polyether ether ketone) resin, and the like can be used. As shown in FIG. 3, the sliding member 30 has an annular shape, and the entire inner peripheral surface thereof forms a shroud surface 31 facing the impeller 10 (FIG. 1). Further, the sliding member 30 is formed to have a cylindrical sliding member main body 310 and a diameter that is expanded radially outward on the side opposite to the air inlet 11 in the sliding member main body 310 (that is, the rear end side in the insertion direction described later). The enlarged diameter portion 311 is provided. The enlarged diameter portion 311 is formed in the entire circumferential direction of the sliding member 30. The enlarged diameter portion 311 is further provided with a flange portion 32 protruding outward in the radial direction. In this example, the flange portion 32 is formed on the entire circumference of the enlarged diameter portion 311. As shown in FIGS. 1 and 2, the sliding member 30 has a sliding member main body 310 positioned in the first recess 210 in the inner peripheral recess 21 and a diameter-enlarged portion 311 positioned in the second recess 220. It is disposed in the recess 21.

  As shown in FIG. 3, the ring-shaped member 40 is formed in a ring shape along the recess press-contact surface 212 of the inner peripheral recess 21, and the cross-sectional shape thereof is substantially rectangular as shown in FIGS. 1 and 2. It is made. The radially outer surface 42 facing the concave pressing surface 212 is formed over the entire outer periphery of the ring-shaped member 40 along the press-fitting direction X of the ring-shaped member 40. The outer diameter of the ring-shaped member 40 is slightly larger than the inner diameter of the second recess 220 in the inner peripheral recess 21, and the radially outer surface 42 is pressed against the recess by pressing the ring-shaped member 40 into the second recess 220. The surface 212 is pressed. On the other hand, the radially inner side surface 43 located on the opposite side of the radially outer surface 42 of the ring-shaped member 40 is in pressure contact with the outer peripheral surface 313 of the enlarged diameter portion 311 of the sliding member 30.

  As shown in FIG. 2, in the state in which the ring-shaped member 40 is press-fitted into the second recess 220, the press-fitting direction front side surface 41 of the ring-shaped member 40 faces the recess facing surface 213. And the collar part 32 of the sliding member 30 is clamped by the press-fitting direction front side surface 41 and the recessed part opposing surface 213. FIG. As shown in FIG. 2, the flange portion 32 protrudes radially outward from the enlarged diameter portion 311, but the flange outer peripheral surface 32 a and the recess portion, which are outer peripheral surfaces facing the recessed portion pressure contact surface 212 in the flange portion 32. It is not in contact with the pressure contact surface 212. Thereby, the space part 50 enclosed by the press injection direction front side surface 41, the recessed part opposing surface 213, and the collar outer peripheral surface 32a is formed. In the first recess 210, the outer diameter of the sliding member body 310 is smaller than the inner diameter of the first recess 210, so that the outer circumferential surface 310 a of the sliding member body 310 is separated from the outer circumferential surface 210 a of the first recess 210. ing. Thereby, a space 51 is formed between the outer peripheral surface 310 a of the sliding member main body 310 and the outer peripheral surface 210 a of the first recess 210. Furthermore, as shown in FIG. 1, the sliding member 30 has a flange portion 32 at the first end portion 34 in the axial direction X. The second end 35 opposite to the first end 34 is separated from the end facing surface 210 b that faces the second end 35 in the inner circumferential recess 21. Thereby, the space part 52 is formed between the 2nd edge part 35 and the edge part opposing surface 210b.

  Further, as shown in FIG. 1, an end surface 70 of the bearing housing or the back plate of the impeller 10 is located on the opposite side of the housing body 20 from the intake port 11, and between the end surface 70 and the housing body 20. Is formed with a diffuser portion 14 serving as a fluid passage leading from the impeller 10 side to the sucrose chamber 12. In the housing body 20, a surface facing the end surface 70 is a diffuser surface 24.

  As shown in FIG. 1, the impeller 10 is disposed on the inner peripheral surface (the shroud surface 31) side of the sliding member 30 of the housing body 20, and is attached so as to be rotatable about the rotation shaft 15. Further, the impeller 10 includes a hub 16 and a plurality of blades 17 protruding in the circumferential direction from the outer peripheral surface thereof. The plurality of blades 17 are arranged to face the shroud surface 31 of the sliding member 30.

  In the compressor including the compressor housing 1 for the supercharger of this example, as shown in FIG. 1, the supply air sucked from the intake port 11 through the intake passage 12 by the rotation of the impeller 10 is caused by the blade 17 of the impeller 10. Accelerated and sent to the diffuser section 14. Then, the supply air is boosted in the diffuser unit 14 and sent to the scroll chamber 13.

Next, the manufacturing method of the compressor housing 1 of this example is demonstrated.
In manufacturing the compressor housing 1, first, as shown in FIG. 4, a housing coarse material 20 a that is a coarse material of the housing body 20 and a ring-shaped coarse material 40 a that is a coarse material of the ring-shaped member 40 are integrated. The integrated coarse material 60 is formed (integrated coarse material forming step S1).
In this example, in the integrated coarse material forming step S1, the integrated coarse material 60 is formed from an aluminum alloy by a gravity casting method. As shown in FIG. 4, in the integrated coarse material 60, the intake port 11 and the intake passage 12 are formed, and at the position 40b (second recess 220 in FIG. 2) where the ring-shaped member 40 is press-fitted in the housing coarse material 20a. A ring-shaped coarse material 40a was formed so as to protrude in a ring shape on the side opposite to the intake port 11 along the line. Furthermore, the scroll chamber 13 was formed in the integral coarse material 60 using the core.

  Next, the integrated coarse material 60 (FIG. 4) is processed and divided to form the housing body 20 and the ring-shaped member 40 as shown in FIG. 5 (coarse material processing division step S2). That is, in the rough material processing division step S2, in the state of the integrated coarse material 60 shown in FIG. 4, the inner peripheral portion 20b corresponding to the housing coarse material 20a is cut to have the first concave portion 210 and the second concave portion 220. A portion corresponding to the housing main body portion 20 is formed by forming the inner peripheral recess 21 (FIG. 5), and a portion corresponding to the ring-shaped coarse material portion 40a is ground to shape a portion corresponding to the ring-shaped member 40. . Thereafter, the processed integrated coarse material 60 was divided into the housing body 20 and the ring-shaped member 40, respectively.

  Next, as shown in FIG. 6, after the ring-shaped member 40 is press-fitted into the slide member 30 prepared in advance and assembled, the assembled body is press-fitted into the inner peripheral recess 21 of the housing body 20 (press-fitting step). S3). As shown in FIG. 7, the ring-shaped member 40 is press-fitted into the second concave portion 220 of the inner peripheral concave portion 21, so that the flange portion is pressed by the front side surface 41 of the ring-shaped member 40 in the press-fitting direction and the concave facing surface 213 of the inner peripheral concave portion 21. 32 was pinched. The outer diameter of the radially outer surface 42 of the ring-shaped member 40 is formed to be slightly larger than the inner diameter of the recess press-contact surface 212 in the second recess 220, and the ring-shaped member 40 is press-fit into the second recess 220 in the press-fitting step S3. By doing so, the radially outer surface 42 of the ring-shaped member 40 was brought into pressure contact with the recess press-contact surface 212 of the second recess 220. The radially inner side surface 43 of the ring-shaped member 40 is in pressure contact with the outer peripheral surface 313 of the enlarged diameter portion 311 of the sliding member 30.

  Thereafter, the inner peripheral portion 30b (FIG. 7) of the sliding member 30 is cut together with the ring-shaped member 40 and the inner peripheral surface of the housing body 20 to form a shroud surface 31 as shown in FIG. 8 (shroud surface formation). Step S4). Thereby, a continuous surface without a step was formed from the intake port 11 through the intake passage 12 and the shroud surface 31 to the diffuser surface 24. Thus, the compressor housing 1 was completed.

Next, the effect in the compressor housing 1 for superchargers of this example is explained in full detail.
According to the compressor housing 1 for a supercharger of this example, the sliding member 30 is fixed via the flange portion 32, so that a screw member for fixing the sliding member 30 becomes unnecessary. Therefore, the conventional housing recess provided to prevent a part of the screw member from protruding from the diffuser surface 24 into the fluid passage is also unnecessary. Thereby, in the shroud surface 31 of the sliding member 30, the flow of the air discharged from the impeller 10 is not disturbed, and a reduction in compression efficiency can be prevented.

  Further, by pressing the ring-shaped member 40 into the inner peripheral recess 21 of the housing body 20, the flange portion 32 of the sliding member 30 is pressed against the front side surface 41 of the ring-shaped member 40 in the press-fitting direction and the recess facing surface 213 of the inner peripheral recess 21. It is pinched by. As a result, the sliding member 30 is fixed to the inner peripheral recess 21 of the housing body 20.

  Further, since there is no need to provide a conventional storage recess in the diffuser surface 24, water or the like does not accumulate on the diffuser surface 24, and there is no concern about corrosion. In addition, since the conventional process of filling the recess with a putty or the like is not required, the material cost does not increase. Further, since it is not necessary to enlarge the sliding member 30 to the diffuser surface 24 that is a region not facing the impeller 10 in order to secure a region for fixing the screw member to the sliding member 30, the sliding member 30 can be reduced in size, This is advantageous in terms of cost.

  Further, the ring-shaped member 40 is made of the same material as that for forming the housing body 20. Thereby, even if both linear expansion coefficients become equal and thermal expansion and thermal contraction arise in both, the pressure-contact in the pressure-contact part of the radial direction outer side surface 42 of the ring-shaped member 40 and the recessed part pressure-contact surface 212 of the inner peripheral recessed part 21 is demonstrated. It can prevent power loss. Thereby, the press-fitted state of the ring-shaped member 40 with respect to the inner peripheral recess 21 of the housing body 20 can be sufficiently maintained. As a result, even if a temperature change occurs, the holding force against the sliding member 30 in the inner peripheral recess 21 of the housing body 20 is sufficiently prevented.

  Further, the flange portion 32 is formed on the entire circumference of the sliding member 30. As a result, the sliding member 30 has the flange portion 32 provided over the entire circumference of the sliding member 30 sandwiched between the front side surface 41 in the press-fitting direction of the ring-shaped member 40 and the concave portion facing surface 213 of the inner peripheral concave portion 21. Therefore, a sufficient holding force for the sliding member 30 can be secured.

  Further, the ring-shaped member 40 is formed along the recessed portion pressure contact surface 212 of the second recessed portion 220 in the inner peripheral recessed portion 21, and the radially outer surface 42 of the ring-shaped member 40 is formed on the entire circumference of the ring-shaped member 40. Has been. Thereby, since the press-contact part of the recessed part press-contact surface 212 and the radial direction outer side surface 42 can be ensured widely, the ring-shaped member 40 can be fixed to the housing main body 20 reliably.

  In this example, the ring-shaped member 40 has a substantially rectangular cross-sectional shape. However, the present invention is not limited thereto, and the formability of the ring-shaped member 40 and the ease of press-fitting into the inner peripheral recess 21 are required. The cross-sectional shape of the sliding member 30 can be appropriately determined in consideration of the holding force of the sliding member 30, the manufacturing cost, and the like.

  In this example, the flange portion 32 is formed so as to protrude outward in the radial direction in the entire circumference of the sliding member 30, but is not limited thereto, and may be provided on a part of the outer periphery of the sliding member 30. For example, the position where the flange portion 32 is formed on the outer periphery of the sliding member 30 can be appropriately determined in consideration of the moldability of the sliding member 30, the manufacturing cost, the required holding force for the sliding member 30, and the like.

  Further, in this example, the sliding member 30 has the flange portion 32 at the first end portion 34 in the axial direction X, and the second end portion 35 opposite to the first end portion 34 is formed in the inner circumferential recess 21. It is separated from the end facing surface 210 b that faces the second end 35. Thus, when the sliding member 30 is inserted into the inner circumferential recess 21 from the second end portion 35 with the second end portion 35 as the front side and the first end portion 34 formed with the flange portion 32 as the rear side, When the second end portion 35 of the member 30 is in contact with the end facing surface 210b of the inner peripheral recess 21, the expansion of the sliding member 30 toward the second end portion 35 is restricted. As a result, the diffuser passage 14 becomes narrow. However, in this example, the flange portion 32 is provided at the first end portion 34 close to the diffuser passage 14, and the second end portion 35 is separated from the end facing surface 210 b of the inner peripheral recess 21. Thereby, the expansion | swelling to the 2nd end part 35 side of the sliding member 30 is accept | permitted, and the expansion amount to the 1st end part 34 side of the sliding member 30 can be made small. As a result, it is possible to suppress the diffuser passage 14 from becoming narrow.

  In this example, the outer peripheral surface 310 a of the sliding member 30 is separated from the outer peripheral surface 210 a of the inner peripheral recess 21. As a result, a space 51 is formed between the sliding member 30 and the inner circumferential recess 21. When the sliding member 30 swells, the outer peripheral surface 310 a of the sliding member 30 swells into the space 51. Thereby, when the sliding member 30 swells, it can prevent that the sliding member 30 reduces in diameter. As a result, it is not necessary to increase the tip clearance between the sliding member 30 and the impeller 10 in advance in consideration of the reduced diameter due to the swelling of the sliding member 30, and the tip clearance can be reduced from the beginning. Further, when the sliding member 30 to which the ring-shaped member 40 is attached is assembled to the housing main body 20, the outer peripheral surface 310 a of the sliding member 30 does not contact the outer peripheral surface 210 a of the inner peripheral concave portion 21, and the sliding member 30 is inserted into the inner peripheral concave portion 21. As a result, the assembling workability is improved.

  Moreover, according to the manufacturing method of the compressor housing 1 for superchargers of this example, the compressor housing 1 for superchargers which has the said effect can be manufactured. Further, in the integrated coarse material forming step S <b> 1, the integrated coarse material 60 in which the housing coarse material 20 a that is the coarse material of the housing body 20 and the ring-shaped coarse material 40 a that is the coarse material of the ring-shaped member 40 are integrally formed. In the coarse material processing and dividing step S2, the integrated coarse material 60 is processed, and then divided into the housing body 20 and the ring-shaped member 40 to form both. That is, the ring-shaped member 40 was processed and divided in the process of processing the housing body 20 (coarse material processing division step S2). Thereby, a manufacturing process can be simplified compared with the case where both the coarse materials 20a and 40b are produced separately and processed individually.

  Moreover, since the housing main body 20 and the ring-shaped member 40 are each formed from the housing coarse material 20a and the ring-shaped coarse material 40a cut out from the integral coarse material 60, the housing main body 20 and the ring-shaped member 40 are the same forming material. Consists of. Therefore, both have the same linear thermal expansion coefficient. Therefore, even if thermal expansion / shrinkage occurs in both due to temperature change, the radially outer surface 42 of the ring-shaped member 40 and the concave pressure-contact surface 212 of the inner peripheral concave portion 21. It is possible to prevent a decrease in pressure contact force at the pressure contact portion. Thereby, the press-fit state of the ring-shaped member 40 with respect to the inner peripheral recessed part 21 of the housing main body 20 can be maintained. As a result, even if a temperature change occurs, a decrease in holding force with respect to the sliding member 30 in the inner peripheral recess 21 of the housing body 20 is prevented.

  Further, in the method of manufacturing the compressor housing 1 for the supercharger, in the integrated coarse material forming step S1, the ring-shaped coarse material 40a is along a position corresponding to the position where the ring-shaped member 40 is press-fitted in the housing coarse material 20a. Thus, it is integrally formed with the housing coarse material 20a. Thus, there is no need to separately prepare a casting mold for molding the housing coarse material 20a and a casting mold for molding the ring-shaped coarse material 40a, and a casting mold for forming the integral coarse material 60 of both is prepared. Just do it. Therefore, the mold cost can be reduced. In addition, casting costs can be reduced by casting them together rather than casting them separately. As a result, the manufacturing cost can be reduced.

  In this example, in the integrated coarse material forming step S1, the ring-shaped coarse material 40a is formed on the opposite side of the intake port 11 along the position 40b where the ring-shaped member 40 is press-fitted in the housing coarse material 20a. The following may be used. That is, as shown in FIG. 9, in the integrated coarse material forming step S1, the ring-shaped coarse material 40a is opposite to the side where the ring-shaped member 40 is press-fitted along the end portion 11a of the intake port 11 in the housing coarse material 20a. You may form integrally with the housing coarse material 20a so that it may protrude to the side. Also in this case, as described above, since it is sufficient to prepare a casting mold that molds the integral coarse material of both, since the mold cost and the casting cost can be reduced, there is an effect that the manufacturing cost can be reduced. .

  In this example, the integrated coarse material 60 is formed by the gravity casting method in the integrated coarse material forming step S1, but not limited thereto, it may be formed by a die casting method or other known methods. In the case of the die casting method, the integral coarse material 60 is appropriately divided into a plurality of pieces so as not to cause undercut.

  As described above, according to the present example, a compressor housing 1 for a supercharger that can prevent a reduction in compression efficiency, maintain a holding force for the sliding member 30, and is advantageous in terms of cost, and a method for manufacturing the same are provided. can do.

Claims (8)

A housing main body configured to be capable of accommodating an impeller and having a concave inner peripheral recess formed on an inner peripheral surface forming an annular shape along the outer periphery of the impeller;
An annular sliding member that is disposed in the inner circumferential recess and whose inner circumferential surface forms a shroud surface facing the impeller;
A ring-shaped member that is formed in a ring shape along the inner peripheral recess, and is press-fitted into the inner peripheral recess along the axial direction of the impeller;
With
The inner circumferential recess includes a recess press-contact surface that is along the press-fitting direction of the ring-shaped member and is pressed against the radially outer surface of the ring-shaped member, and a concave-facing surface that faces the front side surface of the ring-shaped member in the press-fitting direction. Have
The sliding member has a flange that protrudes radially outward of the sliding member;
A compressor housing for a supercharger, wherein the flange is sandwiched between the front side surface in the press-fitting direction and the concave-facing surface when the ring-shaped member is press-fitted into the inner circumferential concave portion. .   The compressor housing for a supercharger according to claim 1, wherein the ring-shaped member is made of the same material as that for forming the housing body.   The turbocharger compressor housing according to claim 1, wherein the flange is formed on the entire circumference of the sliding member.   The sliding member has the flange at the first end in the axial direction, and the second end opposite to the first end is the end facing the second end in the inner circumferential recess. The compressor housing for a supercharger according to any one of claims 1 to 3, wherein the compressor housing is separated from the facing surface.   The compressor housing for a supercharger according to any one of claims 1 to 4, wherein an outer peripheral surface of the sliding member is separated from an outer peripheral surface of the inner peripheral recess. A method of manufacturing a compressor housing for a turbocharger according to claim 1,
An integrated coarse material forming step of forming an integral coarse material by integrally forming a housing coarse material that is a coarse material of the housing body and a ring-shaped coarse material that is a coarse material of the ring-shaped member;
Processing and dividing the integrated coarse material to form the housing main body and the ring-shaped member;
A method for manufacturing a compressor housing for a supercharger.   In the integrated coarse material forming step, the ring-shaped coarse material is integrally formed with the housing coarse material along a position where the ring-shaped member is press-fitted in the housing coarse material. Item 7. A method for manufacturing a compressor housing for a turbocharger according to Item 6.   In the integrated coarse material forming step, the ring-shaped coarse material is formed along the housing coarse material along an end portion of an intake port formed on the opposite side to the side on which the ring-shaped member is press-fitted in the housing coarse material. The method of manufacturing a compressor housing for a supercharger according to claim 6, wherein the compressor housing is integrally formed.

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