EP3263911A1 - Compressor housing for supercharger and manufacturing method thereof - Google Patents
Compressor housing for supercharger and manufacturing method thereof Download PDFInfo
- Publication number
- EP3263911A1 EP3263911A1 EP16755427.8A EP16755427A EP3263911A1 EP 3263911 A1 EP3263911 A1 EP 3263911A1 EP 16755427 A EP16755427 A EP 16755427A EP 3263911 A1 EP3263911 A1 EP 3263911A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- raw material
- abradable seal
- press
- ring member
- inner circumferential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/284—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for compressors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/40—Application in turbochargers
Definitions
- the present invention relates to a compressor housing for a turbocharger and a method of manufacturing the same.
- a compressor for use in a supercharger such as a turbocharger of an automobile includes a compressor housing that is configured to be able to house an impeller, and includes an intake port for sucking air toward the impeller, a scroll chamber for introducing air discharged by the impeller thereinto, the scroll chamber being formed in a circumferential direction at an outer circumferential side of the impeller, and a shroud surface opposed to the impeller.
- compression efficiency of the compressor can be increased by minimizing a gap between blades of the impeller and the shroud surface of the compressor housing.
- the gap is decreased, there is a risk that the impeller may be damaged, for example, when the impeller blades come into contact with the shroud surface of the compressor housing due to vibrations, a runout of an impeller rotation shaft, or the like.
- an abradable seal made of a resin or the like that is softer than the impeller blades is attached to a portion of the compressor housing, which forms the shroud surface (Patent Document 1).
- Patent Document 1 JP-A-09-170442
- the abradable seal in order to fix the abradable seal to the shroud part, the abradable seal is expanded to a diffuser portion that is not opposed to the impeller, then, fastened and fixed thereto with a screw member through a screw hole provided in the diffuser portion. Further, a housing recess for housing a head of each screw member is provided on a diffuser surface of the abradable seal in order to avoid the head of the screw member from projecting into a fluid passage from the diffuser surface.
- the housing recess that opens to the fluid passage affects intake air flowing through the fluid passage to thereby disturb a flow of airflow, which may reduce compression efficiency.
- the housing recess has water or the like in, this may be a cause of corrosion.
- such configuration has disadvantages such as increase of manufacturing processes and/or increase of material costs.
- the abradable seal is expanded to the diffuser portion that is a region not opposed to the impeller, the abradable seal is relatively increased in size.
- a material for forming the abradable seal is generally more costly than a material for forming the compressor housing. Therefore, upsizing of the abradable seal is disadvantageous in terms of cost.
- the present invention has been made in view of the conventional problems as mentioned above, and it is intended to provide a compressor housing for a turbocharger which makes it possible to prevent reduction of compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and a method of manufacturing the same.
- One aspect of the present invention provides a compressor housing for a turbocharger configured to house an impeller, the compressor housing including:
- the inner circumferential recess includes a recess press-contact surface that is formed along the press-fitting direction of the ring member, and press-contacts the radial-direction outside surface of the ring member; and a recess opposing surface that opposes a press-fitting direction forward surface of the ring member
- the abradable seal includes a flange that projects outwardly in the radial direction of the abradable seal, and the flange is held between the press-fitting direction forward surface and the recess opposing surface by press-fitting the ring member into the inner circumferential recess.
- Another aspect of the present invention provides a method of manufacturing the compressor housing.
- the method includes the steps of:
- the flange of the abradable seal is held between the press-fitting direction forward surface of the ring member and the recess opposing surface of the inner circumferential recess by press-fitting the ring member into the inner circumferential recess of the housing body.
- the diffuser surface has water or the like in, which may cause corrosion.
- material cost does not increase.
- the abradable seal can be downsized, which is advantageous in terms of cost.
- an integral raw material constructed from a housing raw material to be a raw material for a housing body and a ring-shaped raw material to be a raw material for a ring member is formed in the step of forming an integral raw material, and in the step of machining and dividing the integral raw material, the integral raw material is machined, and then is divided to form the housing body and the ring member as separated bodies. That is, the ring-shaped raw material can be machined and divided simultaneously in the step of machining the housing body. In this way, the manufacturing processes can be simplified as compared to the case where both raw materials are separately prepared and machined independently.
- the housing body and the ring member are formed from the housing raw material and the ring-shaped raw material respectively, both of which are cut out from the integral raw material, the housing body and the ring member are composed of the same forming material.
- the housing body and the ring member have the same linear thermal expansion coefficients, accordingly, even if temperature change causes heat expansion or heat contraction in the housing body and/or the ring member, reduction of the press-contact force at a position where the radial-direction outside surface of the ring member and the recess press-contact surface of the inner circumferential recess come into press-contact with each other, can be prevented.
- the press-fitted state of the ring member in relation to the inner circumferential recess of the housing body can be maintained.
- reduction of the holdability for the abradable seal, of the inner circumferential recess of the housing body can be prevented even if any temperature change occurs.
- a compressor housing for a turbocharger which makes it possible to prevent reduction of the compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and a method of manufacturing the same.
- the compressor housing for a turbocharger according to the present invention can be used for a turbocharger for an automobile, and the like.
- the ring member is preferably composed of the same forming material as the housing body.
- both the housing body and the ring member have the same linear thermal expansion coefficients, accordingly, even if heat expansion or heat contraction occur in the housing body and/or the ring member, reduction of the press-contact force at a position where the radial-direction outside surface of the ring member and the recess press-contact surface of the inner circumferential recess come into press-contact with each other, can be prevented.
- the press-fitted state of the ring member in relation to the inner circumferential recess of the housing body can be sufficiently maintained.
- reduction of the holdability for the abradable seal, of the inner circumferential recess of the housing body can be sufficiently prevented even if any temperature change occurs.
- the flange is formed on an entire circumference of the abradable seal.
- the flange formed over the entire circumference of the abradable seal is held between the press-fitting direction forward surface of the ring member and the recess opposing surface of the inner circumferential recess in the housing body so as to fix the abradable seal, thereby reliably obtaining sufficient holdability for the abradable seal.
- the abradable seal preferably includes the flange at a first end portion in the axial direction, and a second end portion of the abradable seal at the opposite side to the first end portion is preferably spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess.
- the abradable seal is inserted into the inner circumferential recess with the second end portion being as a forward end, and the second end portion of the abradable seal is in contact with the opposing end surface of the inner circumferential recess, the abradable seal is prevented from expanding at the side of the second end portion and an amount of expansion at the side of the first end portion becomes large. As a result, a diffuser passage becomes narrow.
- the flange is formed at the first end portion close to the diffuser passage, and the second end portion is made spatially apart from the opposing end surface of the inner circumferential recess. Consequently, the abradable seal is allowed to expand at the side of the second end portion, so that the amount of expansion at the side of the first end portion can be made small. As a result, the diffuser passage can be prevented from being narrowed.
- an outer circumference surface of the abradable seal is preferably spatially apart from an outer circumference surface of the inner circumferential recess.
- a space is formed between the abradable seal and the inner circumferential recess. Therefore, if the abradable seal expands, the outer circumference surface of the abradable seal expands inside of the space. Consequently, reduction of the diameter in the expanded abradable seal can be prevented.
- the tip clearance can be set to be small from the beginning.
- the abradable seal having the ring member attached thereto when installed on the housing body, the abradable seal can be inserted into the inner circumferential recess such that the outer circumference surface of the abradable seal is in no contact with the outer circumference surface of the inner circumferential recess, which improves assemble workability.
- the ring-shaped raw material can be formed as a single body with the housing raw material along a place for press-fitting the ring member in the step of forming an integral raw material.
- the ring-shaped raw material is formed in the step of forming an integral raw material as a single body with the housing raw material along an end portion of an intake port that is formed at an opposite side to a side on which the ring member is to be press-fitted. Also in this case, the molding cost and the casting cost can be reduced, to thereby totally reduce the manufacturing costs.
- a compressor housing for a turbocharger according to the present embodiment will be described with reference to Figures 1 to 9 .
- a compressor housing 1 for a turbocharger according to the present embodiment (hereinafter also referred to as the "compressor housing 1") is equipped with a housing body 20, an abradable seal 30, and a ring member 40 as shown in Figure 1 .
- the housing body 20 is configured to be able to house an impeller 10, and includes an inner circumferential recess 21 recessively formed on an annular inner circumference surface along an outer circumference 10a of the impeller 10.
- the abradable seal 30 is annularly formed and disposed in the inner circumferential recess 21, and the inner circumference surface of the abradable seal 30 forms a shroud surface 31 that opposes the impeller 10.
- the ring member 40 is formed in a ring shape along the inner circumferential recess 21 of the housing body 20, and is press-fitted into the inner circumferential recess 21 in the axial direction of the impeller.
- the inner circumferential recess 21 includes a recess press-contact surface 212 that is formed along the press-fitting direction (i.e. the axial direction X) of the ring member 40, and press-contacts a radial-direction outside surface 42 of the ring member 40; and a recess opposing surface 213 that opposes a press-fitting direction forward surface 41 of the ring member 40.
- the abradable seal 30 includes a flange 32 that projects outwardly in a radial direction of the abradable seal 30, and the flange 32 is held between the press-fitting direction forward surface 41 and the recess opposing surface 213 by press-fitting the ring member 40 into the inner circumferential recess 21.
- the compressor housing 1 forms an outer shell of a compressor (compression machine) for use in a turbocharger of an automobile.
- the compressor housing 1 according to the present embodiment will be described in detail below.
- the housing body 20 is made of an aluminum cast product obtained by gravity casting, and is equipped with an intake port 11, an intake passage 12, and a scroll chamber 13, as shown in Figures 1 and 2 .
- the intake port 11 and the intake passage 12 are defined by a cylindrical portion 23.
- the scroll chamber 13 is formed on the outer circumference side of the impeller 10 in the circumferential direction to introduce air discharged from the impeller 10 thereinto.
- the inner circumferential recess 21 is formed on the inner circumference surface of the housing body 20 along the outer circumference of the abradable seal 30. And, the inner circumferential recess 21 includes a first cylindrical recessed portion 210 that is recessively formed along a cylindrical abradable seal body part 310 that will be mentioned below, of the abradable seal 30, and a second cylindrical recessed portion 220 that is formed recessively further than the first recessed portion 210 along an enlarged diameter part 311. Thus, the inner circumferential recess 21 is configured to be able to have the abradable seal 30 disposed therein.
- the second cylindrical recessed portion 220 of the inner circumferential recess 21 includes the recess press-contact surface 212 that is formed along the press-fitting direction of the ring member 40 that will be mentioned below, and press-contacts the radial-direction outside surface 42 of the ring member 40; and the recess opposing surface 213 that extends in the radial direction in such a manner to oppose the press-fitting direction forward surface 41 that defines a press-fitting direction X forward side of the ring member 40.
- the abradable seal 30 is formed of an elastically deformable material.
- the abradable seal 30 is made of a polyimide resin.
- the material for forming the abradable seal 30 is not limited to this, and available materials include Teflon (registered trademark), PPS (polyphenylene sulfide) resin, and PEEK (polyetheretherketone) resin, and the like.
- the abradable seal 30 has an annular shape, and the entire inner circumference surface forms the shroud surface 31, opposing the impeller 10 ( Figure 1 ).
- the abradable seal 30 includes the cylindrical abradable seal body part 310, and the enlarged diameter part 311 that is formed on the opposite side to the intake port 11 (i.e.
- the enlarged diameter part 311 is formed in the circumference direction of the abradable seal 30.
- the enlarged diameter part 311 includes the flange 32 that projects outwardly in the radial direction. In the present embodiment, the flange 32 is formed on the entire circumference of the enlarged diameter part 311.
- the abradable seal 30, as shown in Figures 1 and 2 is disposed in the inner circumferential recess 21 such that the abradable seal body part 310 is positioned in the first recessed portion 210 of the inner circumferential recess 21 and the enlarged diameter part 311 is positioned in the second recessed portion 220.
- the ring member 40 is formed in a ring shape along the recess press-contact surface 212 of the inner circumferential recess 21, and has a substantially rectangular cross section as shown in Figures 1 and 2 .
- the radial-direction outside surface 42 that oppose the recess press-contact surface 212 is formed over the entire outer periphery of the ring member 40 along the press-fitting direction X.
- the outer diameter of the ring member 40 is slightly larger than the inner diameter of the second recessed portion 220 of the inner circumferential recess 21.
- the radial-direction outside surface 42 press-contacts the recess press-contact surface 212 by press-fitting the ring member 40 into the second recessed portion 220.
- a space 50 that is surrounded by the press-fitting direction forward surface 41, the recess opposing surface 213 and the outer circumference surface 32a is formed. Furthermore, in the first recessed portion 210, because the outer diameter of the abradable seal body part 310 is smaller than the inner diameter of the first recessed portion 210, the outer circumference surface 310a of the abradable seal body part 310 is spatially apart from the outer circumference surface 210a of the first recessed portion 210. Thus, a space 51 is formed between the outer circumference surface 310a of the abradable seal body part 310 and the outer circumference surface 210a of the first recessed portion 210.
- the abradable seal 30 has the flange 32 formed at a first end portion 34 thereof in the axial direction X. And, a second end portion 35 at an opposite side to the first end portion 34 is spatially apart from an opposing end surface 210b that faces the second end portion 35 in the inner circumferential recess 21. Thus, a space 52 is formed between the second end portion 35 and the opposing end surface 210b.
- a bearing housing or an end surface 70 of a backplate is located on the opposite side to the intake port 11 of the housing body 20.
- a diffuser portion 14 that serves as a fluid passage that connects the impeller 10 side to a scroll chamber 12 is formed between the end surface 70 and the housing body 20.
- a surface that opposes the end surface 70 forms a diffuser surface 24.
- the impeller 10 is arranged on the side of the inner circumference surface (the shroud surface 31) of the abradable seal 30 in the housing body 20 in a rotatable manner around a rotation shaft 15.
- the impeller 10 has a hub 16 and a plurality of blades 17 that are arranged in the circumferential direction of the hub 16 and project from the outer circumference surface thereof. The plurality of blades 17 are arranged facing the shroud surface 31 of the abradable seal 30.
- an integral raw material 60 constructed from a housing raw material 20a which will be a raw material for the housing body 20, and a ring-shaped raw material 40a which will be a raw material for the ring member 40, is firstly formed (a step S1 of forming an integral raw material).
- the integral raw material 60 was formed from an aluminum alloy by a gravity casting method. As shown in Figure 4 , the intake port 11 and the intake passage 12 were formed in the integral raw material 60, and the ring-shaped raw material 40a was formed in a ring shape protrudingly toward the opposite side to the intake port 11 along a place 40b (the second recessed portion 220 in Figure 2 ) at which the ring member 40 would be press-fitted in the housing raw material 20a. Moreover, the scroll chamber 13 was formed in the integral raw material 60 using a core.
- the integral raw material 60 ( Figure 4 ) was machined and divided to form the housing body 20 and the ring member 40 as shown in Figure 5 (a step S2 of machining and dividing the integral raw material).
- the integral raw material 60 in the state shown in Figure 4 is machined cutting an inner circumferential portion 20b of a part that will be the housing raw material 20a to form the inner circumferential recess 21 ( Figure 5 ) including the first recessed portion 210 and the second recessed portion 220, thereby forming a portion that will be the housing body 20.
- a portion that will be the ring member 40 is formed by grinding a part that will be the ring-shaped raw material 40a.
- the integral raw material 60 thus machined was divided into two components so as to prepare the housing body 20 and the ring member 40.
- the ring member 40 is press-fitted into the abradable seal 30 that has been prepared in advance, and is assembled thereto. Then, the resulting assembly is press-fitted into the inner circumferential recess 21 of the housing body 20 (a step S3 of press-fitting). As shown in Figure 7 , the flange 32 was held between the press-fitting direction forward surface 41 of the ring member 40 and the recess opposing surface 213 of the inner circumferential recess 21 by press-fitting the ring member 40 into the second recessed portion 220 in the inner circumferential recess 21.
- the outer diameter of the radial-direction outside surface 42 of the ring member 40 was slightly larger than the inner diameter of the recess press-contact surface 212 of the second recessed portion 220.
- the radial-direction outside surface 42 of the ring member 40 was made press-contacted with the recess press-contact surface 212 of the second recessed portion 220 by press-fitting the ring member 40 into the second recessed portion 220. It is noted that the radial-direction inside surface 43 of the ring member 40 press-contacts the outer circumference surface 311 of the enlarged part 313 of the abradable seal 30.
- an inner circumferential portion 30b ( Figure 7 ) of the abradable seal 30 was cut along with the ring member 40 and the inner circumference surface of the housing body 20 to form the shroud surface 31 as shown in Figure 8 (a step S4 of forming a shroud surface).
- a continuously smooth surface that continues from the intake port 11 to the diffuser surface 24 through the intake passage 12 and the shroud surface 31 was formed. In this way, the compressor housing 1 was completed.
- the flange 32 of the abradable seal 30 is held between the press-fitting direction forward surface 41 of the ring member 40 and the recess opposing surface 213 of the inner circumferential recess 21 by press-fitting the ring member 40 into the inner circumferential recess 21 of the housing body 20.
- the abradable seal 30 is fixed to the inner circumferential recess 21 of the housing body 20.
- the diffuser surface 24 has water or the like, which may cause corrosion.
- material cost does not increase.
- the abradable seal 30 can be downsized, which is advantageous in terms of cost.
- the ring member 40 is composed of the same forming material as the housing member 20.
- both the housing body 20 and the ring member 40 have the same linear thermal expansion coefficients, accordingly, even if heat expansion or heat contraction occur in the housing body 20 and/or the ring member 40, reduction of the press-contact force at a position where the radial-direction outside surface 42 of the ring member 40 and the recess press-contact surface 212 of the inner circumferential recess 21 come into press-contact with each other, can be prevented.
- the press-fitted state of the ring member 40 in relation to the inner circumferential recess 21 of the housing body 20 can be maintained.
- reduction of the holdability for the abradable seal 30, of the inner circumferential recess 21 of the housing body 20 can be sufficiently prevented even if any temperature change occurs.
- the flange 32 is formed on an entire circumference of the abradable seal 30.
- the flange 32 formed over the entire circumference of the abradable seal 30 is held between the press-fitting direction forward surface 41 of the ring member 40 and the recess opposing surface 213 of the inner circumferential recess 21 so as to fix the abradable seal, thereby reliably obtaining sufficient holdability for the abradable seal 30.
- the ring member 40 is formed along the recess press-contact surface 212 of the second recessed portion 220 in the inner circumferential recess 21, the radial-direction outside surface 42 of the ring member 40 is formed on the entire circumference of the ring member 40. Consequently, a position where the recess press-contact surface 212 and the radial-direction outside surface 42 come into press-contact with each other can be obtained widely, so that the ring member 40 can be reliably fixed to the housing body 20.
- the sectional shape of the ring member 40 is designed to be substantially rectangular.
- the sectional shape is not limited to this, and can be determined as appropriate in view of formability of the ring member 40, easiness of press-fitting into the inner circumferential recess 21, required holdability for the abradable seal 30, manufacturing cost, and so on.
- the flange 32 is protrudingly formed outward in the radial direction on the entire circumference of the abradable seal 30.
- the flange 32 is not limited to this configuration.
- the flange 32 may be formed on part of the outer circumference of the abradable seal 30.
- a position to form the flange 32 can be determined as appropriate in view of formability of the abradable seal 30, manufacturing costs, required holdability for the abradable seal 30, and so on.
- the abradable seal 30 includes the flange 32 at the first end portion 34 in the axial direction, and the second end portion 35 of the abradable seal 30 at the opposite side to the first end portion 34 is spatially apart from the opposing end surface 210b that faces the second end portion 35 in the inner circumferential recess 21.
- the abradable seal 30 is inserted into the inner circumferential recess 21 with the second end portion 35 being as a forward end, and the second end portion 35 of the abradable seal 30 is in contact with the opposing end surface 210b of the inner circumferential recess 21, the abradable seal 30 is prevented from expanding at the side of the second end portion 35. Consequently, the diffuser passage 14 becomes narrow.
- the flange 32 is formed at the first end portion 34 close to the diffuser passage 14, and the second end portion 35 is made spatially apart from the opposing end surface 210b of the inner circumferential recess 21.
- the abradable seal 30 is allowed to expand at the side of the second end portion 35, so that the amount of expansion at the side of the first end portion 34 can be made small.
- the diffuser passage 14 can be prevented from being narrowed.
- the outer circumference surface 310a of the abradable seal 30 is spatially apart from the outer circumference surface 210a.
- the space 51 is formed between the abradable seal 30 and the inner circumferential recess 21.
- the outer circumference surface 310a of the abradable seal 30 expands inside of the space 51. Consequently, reduction of diameter in the expanded abradable seal 30 can be prevented.
- the tip clearance can be set to be small from the beginning.
- the abradable seal 30 having the ring member 40 attached thereto is installed on the housing body 20, it is possible to insert the abradable seal 30 into the inner circumferential recess 21 such that the outer circumference surface 310a of the abradable seal 30 is in no contact with the outer circumference surface 210a of the inner circumferential recess 21, which improves assemble workability.
- the compressor housing 1 for a turbocharger in the present embodiment, it is possible to manufacture the compressor housing 1 that exhibits the above-mentioned operational effects.
- the integral raw material 60 constructed from the housing raw material 20a which will be a raw material for the housing body 20, and the ring-shaped raw material 40a which will be a raw material for the ring member 40, is formed, and in the step S2 of machining and dividing the integral raw material, the integral raw material 60 is machined and divided to form the housing body 20 and the ring member 40.
- the ring member 40 is formed by machining and dividing in the step to process the housing body 20 by machining (the step S2 of machining and dividing the integral raw material). In this way, the manufacturing processes can be simplified as compared to the case where both raw materials 20a and 40b are separately prepared and machined independently.
- the housing body 20 and the ring member 40 are formed from the housing raw material 20a and the ring-shaped raw material 40a respectively, both of which are cut out from the integral raw material 60, the housing body 20 and the ring member 40 are composed of the same forming material.
- the housing body 20 and the ring member 40 have the same linear thermal expansion coefficients, accordingly, even if temperature change causes heat expansion or heat contraction in the housing body 20 and/or the ring member 40, reduction of the press-contact force at a position where the radial-direction outside surface 42 of the ring member 40 and the recess press-contact surface 212 of the inner circumferential recess 21 come into press-contact with each other, can be prevented.
- the press-fitted state of the ring member 40 in relation to the inner circumferential recess 21 of the housing body 20 can be maintained.
- reduction of the holdability for the abradable seal 30, of the inner circumferential recess 21 of the housing body 20 can be prevented even if any temperature change occurs.
- the ring-shaped raw material 40a is formed in the step S1 of forming an integral raw material, as a single body with the housing raw material 20a along a place in which the ring member 40 is to be press-fitted.
- the molding cost can be reduced.
- the casting cost can be reduced in the case of casting a single body compared to the case of casting both raw materials separately. Consequently, the manufacturing cost can be reduced.
- the ring-shaped raw material 40a was formed in the housing raw material 20a at the opposite side to the intake port 11 along a place 40b in which the ring member 40 is to be press-fitted.
- the following configuration can also be adopted.
- the ring-shaped raw material 40a may be formed in the housing raw material 20a along an end portion 11a of the intake port 11 so as to protrude toward the opposite side to the side on which the ring member is to be press-fitted, as a single body with the housing raw material 20a.
- the molding cost and the casting cost can be reduced, thereby exhibiting the operational effects of reducing the manufacturing cost.
- the integral raw material 60 is formed by gravity casting in the step S1 of forming an integral raw material.
- the forming method is not limited to this.
- the integral raw material 60 may be formed by a die-casting method or other conventional methods. When the die-casting method is adopted, the integral raw material 60 is divided into plural pieces as appropriate to eliminate any undercut.
- the compressor housing 1 for a turbocharger which makes it possible to prevent reduction of the compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and the method of manufacturing the same.
Abstract
Description
- The present invention relates to a compressor housing for a turbocharger and a method of manufacturing the same.
- A compressor for use in a supercharger such as a turbocharger of an automobile includes a compressor housing that is configured to be able to house an impeller, and includes an intake port for sucking air toward the impeller, a scroll chamber for introducing air discharged by the impeller thereinto, the scroll chamber being formed in a circumferential direction at an outer circumferential side of the impeller, and a shroud surface opposed to the impeller.
- With the compressor configured as above, compression efficiency of the compressor can be increased by minimizing a gap between blades of the impeller and the shroud surface of the compressor housing.
- However, if the gap is decreased, there is a risk that the impeller may be damaged, for example, when the impeller blades come into contact with the shroud surface of the compressor housing due to vibrations, a runout of an impeller rotation shaft, or the like.
- Thus, in one conventionally proposed structure, an abradable seal made of a resin or the like that is softer than the impeller blades is attached to a portion of the compressor housing, which forms the shroud surface (Patent Document 1).
- In this case, even if the impeller blades come into contact with the shroud surface of the compressor housing due to vibrations, a runout of the impeller rotation shaft, or the like, only the abradable seal attached to the portion that forms the shroud surface is abraded, while the impeller suffers no damage, and the gap between the impeller blades and the shroud surface of the compressor housing is kept small.
- Patent Document 1:
JP-A-09-170442 - However, in
Patent Document 1, in order to fix the abradable seal to the shroud part, the abradable seal is expanded to a diffuser portion that is not opposed to the impeller, then, fastened and fixed thereto with a screw member through a screw hole provided in the diffuser portion. Further, a housing recess for housing a head of each screw member is provided on a diffuser surface of the abradable seal in order to avoid the head of the screw member from projecting into a fluid passage from the diffuser surface. However, the housing recess that opens to the fluid passage, affects intake air flowing through the fluid passage to thereby disturb a flow of airflow, which may reduce compression efficiency. - Also, if the housing recess has water or the like in, this may be a cause of corrosion. Thus, it is conceivable to fill the housing recess with putty or the like after placing the head of the screw member in the housing recess. However, such configuration has disadvantages such as increase of manufacturing processes and/or increase of material costs.
- Also, because in order to prepare a region for fixing the screw member on the abradable seal, the abradable seal is expanded to the diffuser portion that is a region not opposed to the impeller, the abradable seal is relatively increased in size. A material for forming the abradable seal is generally more costly than a material for forming the compressor housing. Therefore, upsizing of the abradable seal is disadvantageous in terms of cost.
- The present invention has been made in view of the conventional problems as mentioned above, and it is intended to provide a compressor housing for a turbocharger which makes it possible to prevent reduction of compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and a method of manufacturing the same.
- One aspect of the present invention provides a compressor housing for a turbocharger configured to house an impeller, the compressor housing including:
- a housing body having an inner circumferential recess recessively formed on an annular inner circumference surface of the housing body along an outer circumference of the impeller;
- an annular abradable seal that is disposed in the inner circumferential recess, an inner circumference surface of the abradable seal forming a shroud surface that opposes the impeller; and
- a ring member that is formed in a ring shape along the inner circumferential recess and is press-fitted into the inner circumferential recess in the axial direction of the impeller.
- In the compressor housing, the inner circumferential recess includes a recess press-contact surface that is formed along the press-fitting direction of the ring member, and press-contacts the radial-direction outside surface of the ring member; and a recess opposing surface that opposes a press-fitting direction forward surface of the ring member, the abradable seal includes a flange that projects outwardly in the radial direction of the abradable seal, and the flange is held between the press-fitting direction forward surface and the recess opposing surface by press-fitting the ring member into the inner circumferential recess.
- Another aspect of the present invention provides a method of manufacturing the compressor housing. The method includes the steps of:
- forming an integral raw material constructed from a housing raw material to be a raw material for the housing body, and a ring-shaped raw material to be a raw material for the ring member as a single body; and
- machining and dividing the integral raw material to form the housing body and the ring member.
- According to the above-mentioned compressor housing for a turbocharger, because the abradable seal is fixed through the flange, there is no need for a screw member(s) for fixing the abradable seal. A housing recess as conventionally provided to keep a screw head of the screw member(s) from projecting from the diffuser surface into a fluid passage, needs not be provided. Consequently, reduction of the compression efficiency in the shroud surface of the abradable seal can be prevented without disturbing a flow of air discharged from the impeller.
- Moreover, according to the compressor housing for a turbocharger, the flange of the abradable seal is held between the press-fitting direction forward surface of the ring member and the recess opposing surface of the inner circumferential recess by press-fitting the ring member into the inner circumferential recess of the housing body.
- Furthermore, because there is no need to provide any housing recess on the diffuser surface as conventionally provided, there is no risk that the diffuser surface has water or the like in, which may cause corrosion. In addition, because it is not necessary to fill the housing recess with putty or the like, as conventionally done, material cost does not increase. Also, because it is not necessary to extend the abradable seal to the diffuser portion that is a region not opposed to the impeller to prepare a region for fixing a screw member(s) to the abradable seal, the abradable seal can be downsized, which is advantageous in terms of cost.
- The above-mentioned method of manufacturing a compressor housing for a turbocharger makes it possible to manufacture a compressor housing that exhibits the operational effects as mentioned above. Further, an integral raw material constructed from a housing raw material to be a raw material for a housing body and a ring-shaped raw material to be a raw material for a ring member is formed in the step of forming an integral raw material, and in the step of machining and dividing the integral raw material, the integral raw material is machined, and then is divided to form the housing body and the ring member as separated bodies. That is, the ring-shaped raw material can be machined and divided simultaneously in the step of machining the housing body. In this way, the manufacturing processes can be simplified as compared to the case where both raw materials are separately prepared and machined independently.
- Moreover, because the housing body and the ring member are formed from the housing raw material and the ring-shaped raw material respectively, both of which are cut out from the integral raw material, the housing body and the ring member are composed of the same forming material. Thus, the housing body and the ring member have the same linear thermal expansion coefficients, accordingly, even if temperature change causes heat expansion or heat contraction in the housing body and/or the ring member, reduction of the press-contact force at a position where the radial-direction outside surface of the ring member and the recess press-contact surface of the inner circumferential recess come into press-contact with each other, can be prevented. Thus, the press-fitted state of the ring member in relation to the inner circumferential recess of the housing body can be maintained. As a result, reduction of the holdability for the abradable seal, of the inner circumferential recess of the housing body can be prevented even if any temperature change occurs.
- As mentioned above, according to the present invention, it is possible to provide a compressor housing for a turbocharger which makes it possible to prevent reduction of the compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and a method of manufacturing the same.
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Figure 1 is a sectional view of a turbocharger equipped with a compressor housing for a turbocharger according toEmbodiment 1. -
Figure 2 is a partially enlarged view of an abradable seal inFigure 1 . -
Figure 3 is a sectional view of the compressor housing for a turbocharger taken along the line III-III inFigure 1 . -
Figure 4 is a sectional view for describing a step of forming an integral raw material in a method of manufacturing the compressor housing for a turbocharger according toEmbodiment 1. -
Figure 5 is a sectional view for describing a step of machining and dividing the integral raw material in a method of manufacturing the compressor housing for a turbocharger according toEmbodiment 1. -
Figure 6 is a sectional view for describing a step of press-fitting a ring member in a method of manufacturing the compressor housing for a turbocharger according toEmbodiment 1. -
Figure 7 is a sectional view for describing a step of forming a shroud surface in a method of manufacturing the compressor housing for a turbocharger according toEmbodiment 1. -
Figure 8 is a sectional view of the compressor housing for a turbocharger after performing the step of forming a shroud surface according toEmbodiment 1. -
Figure 9 is a sectional view of an integral raw material according to one variation. - The compressor housing for a turbocharger according to the present invention can be used for a turbocharger for an automobile, and the like.
- In the above-mentioned compressor housing, the ring member is preferably composed of the same forming material as the housing body. Thus, both the housing body and the ring member have the same linear thermal expansion coefficients, accordingly, even if heat expansion or heat contraction occur in the housing body and/or the ring member, reduction of the press-contact force at a position where the radial-direction outside surface of the ring member and the recess press-contact surface of the inner circumferential recess come into press-contact with each other, can be prevented. Thus, the press-fitted state of the ring member in relation to the inner circumferential recess of the housing body can be sufficiently maintained. As a result, reduction of the holdability for the abradable seal, of the inner circumferential recess of the housing body can be sufficiently prevented even if any temperature change occurs.
- In the compressor housing, the flange is formed on an entire circumference of the abradable seal. In this case, the flange formed over the entire circumference of the abradable seal is held between the press-fitting direction forward surface of the ring member and the recess opposing surface of the inner circumferential recess in the housing body so as to fix the abradable seal, thereby reliably obtaining sufficient holdability for the abradable seal.
- In the compressor housing, the abradable seal preferably includes the flange at a first end portion in the axial direction, and a second end portion of the abradable seal at the opposite side to the first end portion is preferably spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess. Under the condition that the second end portion is defined to be forward and the first end portion having the flange formed thereon is defined to be rearward, when the abradable seal is inserted into the inner circumferential recess with the second end portion being as a forward end, and the second end portion of the abradable seal is in contact with the opposing end surface of the inner circumferential recess, the abradable seal is prevented from expanding at the side of the second end portion and an amount of expansion at the side of the first end portion becomes large. As a result, a diffuser passage becomes narrow. However, in the above-mentioned configuration, the flange is formed at the first end portion close to the diffuser passage, and the second end portion is made spatially apart from the opposing end surface of the inner circumferential recess. Consequently, the abradable seal is allowed to expand at the side of the second end portion, so that the amount of expansion at the side of the first end portion can be made small. As a result, the diffuser passage can be prevented from being narrowed.
- In the compressor housing, an outer circumference surface of the abradable seal is preferably spatially apart from an outer circumference surface of the inner circumferential recess. In this case, a space is formed between the abradable seal and the inner circumferential recess. Therefore, if the abradable seal expands, the outer circumference surface of the abradable seal expands inside of the space. Consequently, reduction of the diameter in the expanded abradable seal can be prevented. Thus, it is not necessary to set a tip clearance between the abradable seal and the impeller larger in advance in prospect of reduction of the diameter of the abradable seal due to the expansion. The tip clearance can be set to be small from the beginning. Further, when the abradable seal having the ring member attached thereto is installed on the housing body, the abradable seal can be inserted into the inner circumferential recess such that the outer circumference surface of the abradable seal is in no contact with the outer circumference surface of the inner circumferential recess, which improves assemble workability.
- In the above-mentioned method of manufacturing a compressor housing for a turbocharger, the ring-shaped raw material can be formed as a single body with the housing raw material along a place for press-fitting the ring member in the step of forming an integral raw material. Thus, there is no need to prepare casting molds for the housing raw material and the ring-shaped raw material separately. It is only needed to prepare a single casting mold for forming an integral raw material constructed from a housing raw material and a ring-shaped raw material. Consequently, the molding cost can be reduced. Also, the casting cost can be reduced in the case of casting a single body as compared to the case of casting both raw materials separately.
- In the method of manufacturing a compressor housing for a turbocharger, the ring-shaped raw material is formed in the step of forming an integral raw material as a single body with the housing raw material along an end portion of an intake port that is formed at an opposite side to a side on which the ring member is to be press-fitted. Also in this case, the molding cost and the casting cost can be reduced, to thereby totally reduce the manufacturing costs.
- A compressor housing for a turbocharger according to the present embodiment will be described with reference to
Figures 1 to 9 . - A
compressor housing 1 for a turbocharger according to the present embodiment (hereinafter also referred to as the "compressor housing 1") is equipped with ahousing body 20, anabradable seal 30, and aring member 40 as shown inFigure 1 . - The
housing body 20 is configured to be able to house animpeller 10, and includes an innercircumferential recess 21 recessively formed on an annular inner circumference surface along anouter circumference 10a of theimpeller 10. - The
abradable seal 30 is annularly formed and disposed in the innercircumferential recess 21, and the inner circumference surface of theabradable seal 30 forms ashroud surface 31 that opposes theimpeller 10. - The
ring member 40 is formed in a ring shape along the innercircumferential recess 21 of thehousing body 20, and is press-fitted into the innercircumferential recess 21 in the axial direction of the impeller. - In addition, as shown in
Figure 2 , the innercircumferential recess 21 includes a recess press-contact surface 212 that is formed along the press-fitting direction (i.e. the axial direction X) of thering member 40, and press-contacts a radial-direction outsidesurface 42 of thering member 40; and arecess opposing surface 213 that opposes a press-fitting direction forward surface 41 of thering member 40. - The
abradable seal 30 includes aflange 32 that projects outwardly in a radial direction of theabradable seal 30, and theflange 32 is held between the press-fitting directionforward surface 41 and therecess opposing surface 213 by press-fitting thering member 40 into the innercircumferential recess 21. - As shown in
Figure 1 , thecompressor housing 1 forms an outer shell of a compressor (compression machine) for use in a turbocharger of an automobile. - The
compressor housing 1 according to the present embodiment will be described in detail below. - The
housing body 20 is made of an aluminum cast product obtained by gravity casting, and is equipped with anintake port 11, anintake passage 12, and ascroll chamber 13, as shown inFigures 1 and2 . - The
intake port 11 and theintake passage 12 are defined by acylindrical portion 23. - The
scroll chamber 13 is formed on the outer circumference side of theimpeller 10 in the circumferential direction to introduce air discharged from theimpeller 10 thereinto. - The inner
circumferential recess 21 is formed on the inner circumference surface of thehousing body 20 along the outer circumference of theabradable seal 30. And, the innercircumferential recess 21 includes a first cylindrical recessedportion 210 that is recessively formed along a cylindrical abradableseal body part 310 that will be mentioned below, of theabradable seal 30, and a second cylindrical recessedportion 220 that is formed recessively further than the first recessedportion 210 along anenlarged diameter part 311. Thus, the innercircumferential recess 21 is configured to be able to have theabradable seal 30 disposed therein. The second cylindrical recessedportion 220 of the innercircumferential recess 21 includes the recess press-contact surface 212 that is formed along the press-fitting direction of thering member 40 that will be mentioned below, and press-contacts the radial-direction outsidesurface 42 of thering member 40; and therecess opposing surface 213 that extends in the radial direction in such a manner to oppose the press-fitting directionforward surface 41 that defines a press-fitting direction X forward side of thering member 40. - The
abradable seal 30 is formed of an elastically deformable material. In the present embodiment, theabradable seal 30 is made of a polyimide resin. The material for forming theabradable seal 30 is not limited to this, and available materials include Teflon (registered trademark), PPS (polyphenylene sulfide) resin, and PEEK (polyetheretherketone) resin, and the like. As shown inFigure 3 , theabradable seal 30 has an annular shape, and the entire inner circumference surface forms theshroud surface 31, opposing the impeller 10 (Figure 1 ). Further, theabradable seal 30 includes the cylindrical abradableseal body part 310, and theenlarged diameter part 311 that is formed on the opposite side to the intake port 11 (i.e. the rearward side in the press-fitting direction to be mentioned below) with the abradableseal body part 310 in-between. Theenlarged diameter part 311 is formed in the circumference direction of theabradable seal 30. Theenlarged diameter part 311 includes theflange 32 that projects outwardly in the radial direction. In the present embodiment, theflange 32 is formed on the entire circumference of theenlarged diameter part 311. Theabradable seal 30, as shown inFigures 1 and2 , is disposed in the innercircumferential recess 21 such that the abradableseal body part 310 is positioned in the first recessedportion 210 of the innercircumferential recess 21 and theenlarged diameter part 311 is positioned in the second recessedportion 220. - As shown in
Figure 3 , thering member 40 is formed in a ring shape along the recess press-contact surface 212 of the innercircumferential recess 21, and has a substantially rectangular cross section as shown inFigures 1 and2 . The radial-direction outsidesurface 42 that oppose the recess press-contact surface 212 is formed over the entire outer periphery of thering member 40 along the press-fitting direction X. And, the outer diameter of thering member 40 is slightly larger than the inner diameter of the second recessedportion 220 of the innercircumferential recess 21. The radial-direction outsidesurface 42 press-contacts the recess press-contact surface 212 by press-fitting thering member 40 into the second recessedportion 220. On the other hand, a radial-direction insidesurface 43 that is positioned on the opposite side to the radial-direction outsidesurface 42 of thering member 40 press-contacts anouter circumference surface 313 of theenlarged diameter part 311 of theabradable seal 30. - As shown in
Figure 2 , in the state in which thering member 40 is press-fitted into the second recessedportion 220, the press-fitting direction forward surface 41 of thering member 40 opposes therecess opposing surface 213. And, theflange 32 of theabradable seal 30 is held between the press-fitting directionforward surface 41 and therecess opposing surface 213. Moreover, as shown inFigure 2 , although theflange 32 projects outwardly in the radial direction from theenlarged diameter part 311, anouter circumference surface 32a of theflange 32, which corresponds to the outer circumference surface that opposes the recess press-contact surface 212 and the recess press-contact surface 212 are not in contact with each other. Thus, aspace 50 that is surrounded by the press-fitting directionforward surface 41, therecess opposing surface 213 and theouter circumference surface 32a is formed. Furthermore, in the first recessedportion 210, because the outer diameter of the abradableseal body part 310 is smaller than the inner diameter of the first recessedportion 210, theouter circumference surface 310a of the abradableseal body part 310 is spatially apart from theouter circumference surface 210a of the first recessedportion 210. Thus, aspace 51 is formed between theouter circumference surface 310a of the abradableseal body part 310 and theouter circumference surface 210a of the first recessedportion 210. Moreover, as shown inFigure 1 , theabradable seal 30 has theflange 32 formed at afirst end portion 34 thereof in the axial direction X. And, asecond end portion 35 at an opposite side to thefirst end portion 34 is spatially apart from an opposingend surface 210b that faces thesecond end portion 35 in the innercircumferential recess 21. Thus, aspace 52 is formed between thesecond end portion 35 and the opposingend surface 210b. - Further, as shown in
Figure 1 , a bearing housing or anend surface 70 of a backplate is located on the opposite side to theintake port 11 of thehousing body 20. Adiffuser portion 14 that serves as a fluid passage that connects theimpeller 10 side to ascroll chamber 12 is formed between theend surface 70 and thehousing body 20. In thehousing body 20, a surface that opposes theend surface 70 forms adiffuser surface 24. - Further, as shown in
Figure 1 , theimpeller 10 is arranged on the side of the inner circumference surface (the shroud surface 31) of theabradable seal 30 in thehousing body 20 in a rotatable manner around arotation shaft 15. In addition, theimpeller 10 has ahub 16 and a plurality ofblades 17 that are arranged in the circumferential direction of thehub 16 and project from the outer circumference surface thereof. The plurality ofblades 17 are arranged facing theshroud surface 31 of theabradable seal 30. - In a compressor provided with the
compressor housing 1 according to the present embodiment, as shown inFigure 1 , intake air that is sucked from theintake port 11 through theintake passage 12, is accelerated by theblades 17 of theimpeller 10 and is fed to thediffuser part 14. Then, the intake air is pressurized in thediffuser portion 14 and is fed into thescroll chamber 13. - Next, a method of manufacturing the
compressor housing 1 according to the present embodiment will be explained. - For manufacturing the
compressor housing 1, as shown inFigure 4 , an integralraw material 60 constructed from a housingraw material 20a which will be a raw material for thehousing body 20, and a ring-shapedraw material 40a which will be a raw material for thering member 40, is firstly formed (a step S1 of forming an integral raw material). - According to the present embodiment, in the step S1 of forming an integral raw material, the integral
raw material 60 was formed from an aluminum alloy by a gravity casting method. As shown inFigure 4 , theintake port 11 and theintake passage 12 were formed in the integralraw material 60, and the ring-shapedraw material 40a was formed in a ring shape protrudingly toward the opposite side to theintake port 11 along aplace 40b (the second recessedportion 220 inFigure 2 ) at which thering member 40 would be press-fitted in the housingraw material 20a. Moreover, thescroll chamber 13 was formed in the integralraw material 60 using a core. - Next, the integral raw material 60 (
Figure 4 ) was machined and divided to form thehousing body 20 and thering member 40 as shown inFigure 5 (a step S2 of machining and dividing the integral raw material). Specifically, in the step S2 of machining and dividing the integral raw material, the integralraw material 60 in the state shown inFigure 4 is machined cutting an innercircumferential portion 20b of a part that will be the housingraw material 20a to form the inner circumferential recess 21 (Figure 5 ) including the first recessedportion 210 and the second recessedportion 220, thereby forming a portion that will be thehousing body 20. At the same time, a portion that will be thering member 40 is formed by grinding a part that will be the ring-shapedraw material 40a. After that, the integralraw material 60 thus machined was divided into two components so as to prepare thehousing body 20 and thering member 40. - Subsequently, as shown in
Figure 6 , thering member 40 is press-fitted into theabradable seal 30 that has been prepared in advance, and is assembled thereto. Then, the resulting assembly is press-fitted into the innercircumferential recess 21 of the housing body 20 (a step S3 of press-fitting). As shown inFigure 7 , theflange 32 was held between the press-fitting direction forward surface 41 of thering member 40 and therecess opposing surface 213 of the innercircumferential recess 21 by press-fitting thering member 40 into the second recessedportion 220 in the innercircumferential recess 21. The outer diameter of the radial-direction outsidesurface 42 of thering member 40 was slightly larger than the inner diameter of the recess press-contact surface 212 of the second recessedportion 220. In the step S3 of press-fitting, the radial-direction outsidesurface 42 of thering member 40 was made press-contacted with the recess press-contact surface 212 of the second recessedportion 220 by press-fitting thering member 40 into the second recessedportion 220. It is noted that the radial-direction insidesurface 43 of thering member 40 press-contacts theouter circumference surface 311 of theenlarged part 313 of theabradable seal 30. - Thereafter, an inner
circumferential portion 30b (Figure 7 ) of theabradable seal 30 was cut along with thering member 40 and the inner circumference surface of thehousing body 20 to form theshroud surface 31 as shown inFigure 8 (a step S4 of forming a shroud surface). Thus, a continuously smooth surface that continues from theintake port 11 to thediffuser surface 24 through theintake passage 12 and theshroud surface 31 was formed. In this way, thecompressor housing 1 was completed. - Next, the operational effects of the
compressor housing 1 for a turbocharger according to the present embodiment will be described in detail. In thecompressor housing 1 according to the present embodiment, because theabradable seal 30 is fixed through theflange 32, there is no need for a screw member(s) for fixing theabradable seal 30. Thus, a housing recess as conventionally provided to keep a screw head of the screw member(s) from projecting from thediffuser surface 24 into a fluid passage, needs not be provided. Consequently, reduction of the compression efficiency in theshroud surface 31 of theabradable seal 30 can be prevented without disturbing a flow of air discharged from theimpeller 10. - Moreover, the
flange 32 of theabradable seal 30 is held between the press-fitting direction forward surface 41 of thering member 40 and therecess opposing surface 213 of the innercircumferential recess 21 by press-fitting thering member 40 into the innercircumferential recess 21 of thehousing body 20. Thus, theabradable seal 30 is fixed to the innercircumferential recess 21 of thehousing body 20. - Furthermore, because there is no need to provide any housing recess on the
diffuser surface 24 as conventionally provided, there is no risk that thediffuser surface 24 has water or the like, which may cause corrosion. In addition, because it is not necessary to fill the housing recess with putty or the like as conventionally done, material cost does not increase. Also, because it is not necessary to expand theabradable seal 30 to thediffuser surface 24 that is a region not opposed to theimpeller 10 in order to prepare a region for fixing a screw member(s) to theabradable seal 30, theabradable seal 30 can be downsized, which is advantageous in terms of cost. - Furthermore, the
ring member 40 is composed of the same forming material as thehousing member 20. Thus, both thehousing body 20 and thering member 40 have the same linear thermal expansion coefficients, accordingly, even if heat expansion or heat contraction occur in thehousing body 20 and/or thering member 40, reduction of the press-contact force at a position where the radial-direction outsidesurface 42 of thering member 40 and the recess press-contact surface 212 of the innercircumferential recess 21 come into press-contact with each other, can be prevented. Thus, the press-fitted state of thering member 40 in relation to the innercircumferential recess 21 of thehousing body 20 can be maintained. As a result, reduction of the holdability for theabradable seal 30, of the innercircumferential recess 21 of thehousing body 20 can be sufficiently prevented even if any temperature change occurs. - Furthermore, the
flange 32 is formed on an entire circumference of theabradable seal 30. Theflange 32 formed over the entire circumference of theabradable seal 30 is held between the press-fitting direction forward surface 41 of thering member 40 and therecess opposing surface 213 of the innercircumferential recess 21 so as to fix the abradable seal, thereby reliably obtaining sufficient holdability for theabradable seal 30. - Furthermore, the
ring member 40 is formed along the recess press-contact surface 212 of the second recessedportion 220 in the innercircumferential recess 21, the radial-direction outsidesurface 42 of thering member 40 is formed on the entire circumference of thering member 40. Consequently, a position where the recess press-contact surface 212 and the radial-direction outsidesurface 42 come into press-contact with each other can be obtained widely, so that thering member 40 can be reliably fixed to thehousing body 20. - In the present embodiment, the sectional shape of the
ring member 40 is designed to be substantially rectangular. However, the sectional shape is not limited to this, and can be determined as appropriate in view of formability of thering member 40, easiness of press-fitting into the innercircumferential recess 21, required holdability for theabradable seal 30, manufacturing cost, and so on. - In the present embodiment, the
flange 32 is protrudingly formed outward in the radial direction on the entire circumference of theabradable seal 30. However, theflange 32 is not limited to this configuration. Theflange 32 may be formed on part of the outer circumference of theabradable seal 30. A position to form theflange 32 can be determined as appropriate in view of formability of theabradable seal 30, manufacturing costs, required holdability for theabradable seal 30, and so on. - In the present embodiment, the
abradable seal 30 includes theflange 32 at thefirst end portion 34 in the axial direction, and thesecond end portion 35 of theabradable seal 30 at the opposite side to thefirst end portion 34 is spatially apart from the opposingend surface 210b that faces thesecond end portion 35 in the innercircumferential recess 21. Under the condition that thesecond end portion 35 is defined to be forward and thefirst end portion 34 having theflange 32 formed thereon is defined to be rearward, when theabradable seal 30 is inserted into the innercircumferential recess 21 with thesecond end portion 35 being as a forward end, and thesecond end portion 35 of theabradable seal 30 is in contact with the opposingend surface 210b of the innercircumferential recess 21, theabradable seal 30 is prevented from expanding at the side of thesecond end portion 35. Consequently, thediffuser passage 14 becomes narrow. However, in the present embodiment, theflange 32 is formed at thefirst end portion 34 close to thediffuser passage 14, and thesecond end portion 35 is made spatially apart from the opposingend surface 210b of the innercircumferential recess 21. Thus, theabradable seal 30 is allowed to expand at the side of thesecond end portion 35, so that the amount of expansion at the side of thefirst end portion 34 can be made small. As a result, thediffuser passage 14 can be prevented from being narrowed. - In the present embodiment, the
outer circumference surface 310a of theabradable seal 30 is spatially apart from theouter circumference surface 210a. Thus, thespace 51 is formed between theabradable seal 30 and the innercircumferential recess 21. And, if theabradable seal 30 expands, theouter circumference surface 310a of theabradable seal 30 expands inside of thespace 51. Consequently, reduction of diameter in the expandedabradable seal 30 can be prevented. Thus, it is not necessary to set a tip clearance between theabradable seal 30 and theimpeller 10 larger in advance in prospect of the reduction of diameter due to the expansion of theabradable seal 30. The tip clearance can be set to be small from the beginning. Further, when theabradable seal 30 having thering member 40 attached thereto is installed on thehousing body 20, it is possible to insert theabradable seal 30 into the innercircumferential recess 21 such that theouter circumference surface 310a of theabradable seal 30 is in no contact with theouter circumference surface 210a of the innercircumferential recess 21, which improves assemble workability. - Moreover, according to the method of manufacturing the
compressor housing 1 for a turbocharger in the present embodiment, it is possible to manufacture thecompressor housing 1 that exhibits the above-mentioned operational effects. Specifically, in the step S1 of forming an integral raw material, the integralraw material 60 constructed from the housingraw material 20a which will be a raw material for thehousing body 20, and the ring-shapedraw material 40a which will be a raw material for thering member 40, is formed, and in the step S2 of machining and dividing the integral raw material, the integralraw material 60 is machined and divided to form thehousing body 20 and thering member 40. In short, thering member 40 is formed by machining and dividing in the step to process thehousing body 20 by machining (the step S2 of machining and dividing the integral raw material). In this way, the manufacturing processes can be simplified as compared to the case where bothraw materials - Furthermore, because the
housing body 20 and thering member 40 are formed from the housingraw material 20a and the ring-shapedraw material 40a respectively, both of which are cut out from the integralraw material 60, thehousing body 20 and thering member 40 are composed of the same forming material. Thus, thehousing body 20 and thering member 40 have the same linear thermal expansion coefficients, accordingly, even if temperature change causes heat expansion or heat contraction in thehousing body 20 and/or thering member 40, reduction of the press-contact force at a position where the radial-direction outsidesurface 42 of thering member 40 and the recess press-contact surface 212 of the innercircumferential recess 21 come into press-contact with each other, can be prevented. Thus, the press-fitted state of thering member 40 in relation to the innercircumferential recess 21 of thehousing body 20 can be maintained. As a result, reduction of the holdability for theabradable seal 30, of the innercircumferential recess 21 of thehousing body 20 can be prevented even if any temperature change occurs. - Furthermore, in the method of manufacturing the
compressor housing 1 for a turbocharger, the ring-shapedraw material 40a is formed in the step S1 of forming an integral raw material, as a single body with the housingraw material 20a along a place in which thering member 40 is to be press-fitted. Thus, there is no need to prepare casting molds for the housingraw material 20a and the ring-shapedraw material 40a separately. It is only needed to prepare a single casting mold for forming the integralraw material 60 constructed from the housingraw material 20a and the ring-shapedraw material 40a. Consequently, the molding cost can be reduced. Also, the casting cost can be reduced in the case of casting a single body compared to the case of casting both raw materials separately. Consequently, the manufacturing cost can be reduced. - According to the present embodiment, in the step S1 of forming an integral raw material, the ring-shaped
raw material 40a was formed in the housingraw material 20a at the opposite side to theintake port 11 along aplace 40b in which thering member 40 is to be press-fitted. Besides this, the following configuration can also be adopted. Specifically, as shown inFigure 9 , in the step S1 of forming an integral raw material, the ring-shapedraw material 40a may be formed in the housingraw material 20a along anend portion 11a of theintake port 11 so as to protrude toward the opposite side to the side on which the ring member is to be press-fitted, as a single body with the housingraw material 20a. Also in this case, because it is only needed to prepare a single casting mold for forming the integral raw material constructed from both raw materials in the same way as mentioned above, the molding cost and the casting cost can be reduced, thereby exhibiting the operational effects of reducing the manufacturing cost. - In the present embodiment, the integral
raw material 60 is formed by gravity casting in the step S1 of forming an integral raw material. However, the forming method is not limited to this. The integralraw material 60 may be formed by a die-casting method or other conventional methods. When the die-casting method is adopted, the integralraw material 60 is divided into plural pieces as appropriate to eliminate any undercut. - As mentioned above, according to the present embodiment, it is possible to provide the
compressor housing 1 for a turbocharger which makes it possible to prevent reduction of the compression efficiency and to maintain holdability for the abradable seal, and which is advantageous in terms of cost, and the method of manufacturing the same.
Claims (8)
- A compressor housing for a turbocharger configured to house an impeller, the compressor housing comprising:a housing body having an inner circumferential recess recessively formed on an annular inner circumference surface thereof along an outer circumference of the impeller;an annular abradable seal that is disposed in the inner circumferential recess, an inner circumference surface of the abradable seal forming a shroud surface that opposes the impeller; anda ring member that is formed in a ring shape along the inner circumferential recess and is press-fitted into the inner circumferential recess in an axial direction of the impeller; whereinthe inner circumferential recess includes a recess press-contact surface that is formed along a press-fitting direction of the ring member, and press-contacts a radial-direction outside surface of the ring member; and a recess opposing surface that opposes a press-fitting direction forward surface of the ring member,the abradable seal includes a flange that projects outwardly in a radial direction of the abradable seal, andthe flange is held between the press-fitting direction forward surface and the recess opposing surface by press-fitting the ring member into the inner circumferential recess.
- The compressor housing according to claim 1, wherein the ring member is composed of a material identical to that of the housing body.
- The compressor housing according to claim 1 or 2, wherein the flange is formed on an entire circumference of the abradable seal.
- The compressor housing according to any one of claims 1 to 3, wherein the flange is provided at a first end portion of the abradable seal in an axial direction, and a second end portion of the abradable seal at an opposite side to the first end portion is spatially apart from an opposing end surface that faces the second end portion in the inner circumferential recess.
- The compressor housing according to any one of claims 1 to 4, wherein an outer circumference surface of the abradable seal is spatially apart from an outer circumference surface of the inner circumferential recess.
- A method of manufacturing the compressor housing according to Claim 1, the method comprising the steps of:forming an integral raw material constructed from a housing raw material to be a raw material for the housing body, and a ring-shaped raw material to be a raw material for the ring member as a single body; andmachining and dividing the integral raw material to form the housing body and the ring member.
- The method of manufacturing the compressor housing according to Claim 6, wherein in the step of forming an integral raw material, the ring-shaped raw material is formed as a single body with the housing raw material along a place for press-fitting the ring member.
- The method of manufacturing the compressor housing according to Claim 6, wherein in the step of forming an integral raw material, the ring-shaped raw material is formed as a single body with the housing raw material along an end portion of an intake port that is formed at an opposite side to a side on which the ring member is to be press-fitted.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2015034671 | 2015-02-25 | ||
PCT/JP2016/055111 WO2016136681A1 (en) | 2015-02-25 | 2016-02-22 | Compressor housing for supercharger and manufacturing method thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3263911A1 true EP3263911A1 (en) | 2018-01-03 |
EP3263911A4 EP3263911A4 (en) | 2018-02-21 |
Family
ID=56788552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16755427.8A Withdrawn EP3263911A4 (en) | 2015-02-25 | 2016-02-22 | Compressor housing for supercharger and manufacturing method thereof |
Country Status (5)
Country | Link |
---|---|
US (1) | US20170350408A1 (en) |
EP (1) | EP3263911A4 (en) |
JP (1) | JPWO2016136681A1 (en) |
CN (1) | CN107208657A (en) |
WO (1) | WO2016136681A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020001752A1 (en) * | 2018-06-26 | 2020-01-02 | Volvo Truck Corporation | A compressor device for an internal combustion engine |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016151747A1 (en) * | 2015-03-24 | 2016-09-29 | 三菱重工業株式会社 | Impeller cover, rotary machine, and impeller cover manufacturing method |
JP6589217B2 (en) * | 2015-04-17 | 2019-10-16 | 三菱重工コンプレッサ株式会社 | Rotating machine, method of manufacturing rotating machine |
DE102017127628A1 (en) * | 2017-11-22 | 2019-05-23 | Man Energy Solutions Se | Turbine and turbocharger |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3294491B2 (en) * | 1995-12-20 | 2002-06-24 | 株式会社日立製作所 | Turbocharger for internal combustion engine |
JP3639846B2 (en) * | 1997-04-22 | 2005-04-20 | 株式会社協立 | Turbocharger with sliding member |
JP3858347B2 (en) * | 1997-05-30 | 2006-12-13 | 石川島播磨重工業株式会社 | Turbocharger |
JP2011052558A (en) * | 2009-08-31 | 2011-03-17 | Toyota Motor Corp | Supercharger |
JP5471650B2 (en) * | 2009-11-05 | 2014-04-16 | トヨタ自動車株式会社 | Turbocharger compressor housing |
JP2011153570A (en) * | 2010-01-27 | 2011-08-11 | Toyota Motor Corp | Abradable seal fixing structure of supercharger |
JP5402682B2 (en) * | 2010-01-29 | 2014-01-29 | 株式会社Ihi | Turbocharger sealing device |
EP2738367B1 (en) * | 2011-07-25 | 2016-03-09 | Toyota Jidosha Kabushiki Kaisha | Compressor housing and exhaust turbine supercharger |
JP2013124564A (en) * | 2011-12-13 | 2013-06-24 | Otics Corp | Compressor housing for supercharger |
JP5905736B2 (en) * | 2012-02-22 | 2016-04-20 | トヨタ自動車株式会社 | Exhaust turbine supercharger manufacturing method and exhaust turbine supercharger |
JP2014088785A (en) * | 2012-10-29 | 2014-05-15 | Otics Corp | Compressor housing for supercharger |
-
2016
- 2016-02-22 WO PCT/JP2016/055111 patent/WO2016136681A1/en active Application Filing
- 2016-02-22 US US15/542,729 patent/US20170350408A1/en not_active Abandoned
- 2016-02-22 JP JP2017502358A patent/JPWO2016136681A1/en active Pending
- 2016-02-22 CN CN201680010144.2A patent/CN107208657A/en active Pending
- 2016-02-22 EP EP16755427.8A patent/EP3263911A4/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020001752A1 (en) * | 2018-06-26 | 2020-01-02 | Volvo Truck Corporation | A compressor device for an internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
JPWO2016136681A1 (en) | 2017-11-30 |
EP3263911A4 (en) | 2018-02-21 |
CN107208657A (en) | 2017-09-26 |
US20170350408A1 (en) | 2017-12-07 |
WO2016136681A1 (en) | 2016-09-01 |
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