JP2016151265A - Compressor housing for supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor housing for a supercharger, which has a simple structure and can be easily manufactured.SOLUTION: A compressor housing 1 has a housing body 20, an annular sliding member 30 forming a shroud surface 31, and a fixing member 4 interposed between the housing body 20 and the sliding member 30 and positioning and fixing them each other. The housing body 20 has a diffuser surface 24 formed on a plane surface orthogonal to an axial direction X on an outer peripheral side of the shroud surface 31. A sub-assembly made from the housing body 20 and the sliding member 30 is formed at a part on a boundary line between the diffuser surface 24 and the shroud surface 31 so as to cross the boundary line, and provided with a recessed space 5 opening to the diffuser surface 24 side. The recessed space 5 is filled with the fixing member 4. The recessed space 5 and the fixing member 4 have an expanding portion increasing a cross sectional area of a crosse section orthogonal to the axial direction as separating from an opening portion, on at least one place in the axial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a compressor housing for a supercharger.

  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 comes into contact with the shroud surface of the compressor housing due to vibration or vibration of the impeller rotating shaft, the sliding member attached to the portion forming 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.

  And the sliding member is being fixed to the housing main body by the ring-shaped resin arrange | positioned continuously at the boundary surface of a housing main body and a sliding member. In disposing the resin, after a sliding member is assembled to the housing body, a liquid resin is injected into a space formed between the housing body and the sliding member and solidified.

Japanese Patent Application Laid-Open No. 2004-324569

  However, the structure described in Patent Document 1 is a structure in which a resin is disposed on the boundary surface between the housing body and the sliding member, and a fixing resin is disposed in the sub-assembly including the housing body and the sliding member. It will be. Therefore, since it is necessary to send the resin from the outside of the sub assembly to this arrangement space, it is necessary to provide a resin insertion hole in the compressor housing and an air vent hole for extracting air from the arrangement space. . Moreover, it is necessary to form these holes long. As a result, the shape of the compressor housing becomes complicated and the manufacturing process becomes complicated.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a compressor housing for a supercharger having a simple configuration and easy to manufacture.

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 fixing member interposed between the housing body and the sliding member and positioning and fixing the two to each other;
The housing body has a diffuser surface formed on a plane orthogonal to the axial direction on the outer peripheral side of the shroud surface,
The sub-assembly comprising the housing body and the sliding member is a concave space formed on a part of the boundary line between the diffuser surface and the shroud surface so as to straddle the boundary line and open to the diffuser surface side. Provided,
The concave space is filled with the fixing member,
The compressor for a supercharger characterized in that the concave space and the fixing member have an extended portion whose cross-sectional area perpendicular to the axial direction increases as the distance from the opening increases, at least at one location in the axial direction. In the housing.

  In the compressor housing, the sub-assembly including the housing main body and the sliding member is provided with the concave space in a part of the boundary line between the diffuser surface and the shroud surface, and the concave space is filled with a fixing member. . Thereby, the sliding member can be reliably fixed to the housing body with a simple configuration.

  That is, the concave space and the fixing member have at least one extension in the axial direction in which the cross-sectional area of the cross section orthogonal to the axial direction increases as the distance from the opening increases. Therefore, the fixing member filled in the concave space does not come out of the opening portion, and reliably stays in the concave space. If this state is maintained, the sliding member is securely fixed to the housing body by the fixing member. Therefore, the sliding member does not shift in the axial direction or the circumferential direction with respect to the housing body.

  Further, since the concave space is opened to the diffuser surface side, it is not particularly necessary to provide an injection path for filling the concave space with the fixing member and an air vent hole for extracting air. Therefore, the compressor housing can have a simple configuration and can be easily manufactured.

  As described above, according to the present invention, it is possible to provide a compressor housing for a supercharger having a simple configuration and easy to manufacture.

FIG. 5 is a cross-sectional view of a turbocharger including a compressor housing for a supercharger according to the first embodiment, and is a cross-sectional view corresponding to a cross section taken along the line I-I in FIG. 4. FIG. 2 is an enlarged sectional view in the vicinity of a shroud surface of the compressor housing in the first embodiment, and is a partially enlarged sectional view of FIG. 1. FIG. 5 is an enlarged cross-sectional view in the vicinity of the shroud surface of the compressor housing in the first embodiment, corresponding to a cross-section taken along line III-III in FIG. The top view of a part of compressor housing seen from the diffuser surface side in Example 1. FIG. The perspective view of the fixing member (concave space) in Example 1. FIG. Sectional explanatory drawing in the state just before the assembly | attachment of the housing main body and a sliding member in Example 1. FIG. Sectional explanatory drawing of the sub assembly which assembled | attached the housing main body and the sliding member in Example 1. FIG. FIG. 3 is an enlarged cross-sectional view around the concave space of the sub assembly in the first embodiment. The expanded sectional view of the state which filled the concave space of the sub assembly in Example 1 with solder. The expanded sectional view of the fixing member (concave space) in Example 2. The expanded sectional view of the fixing member (concave space) in Example 3.

The compressor housing for a supercharger of the present invention can be used for a supercharger such as an automobile turbocharger.
It is preferable that a plurality of the concave spaces and the fixing members are formed. Furthermore, it is preferable that three or more of the concave spaces and the fixing members are formed. The plurality of concave spaces and the fixing member are preferably formed at equal intervals.

Moreover, it is preferable that the said recessed space and the said fixing member have a trapezoid rotary body shape. In this case, the concave space can be easily formed, and the fixing state of the housing body and the sliding member by the fixing member can be further stabilized. The trapezoidal rotator shape is a three-dimensional shape obtained by sweeping the space when the trapezoid is rotated once with a straight line orthogonal to the upper and lower bases as a central axis, and substantially the same. A shape that can be visually identified.
However, the concave space and the fixing member are not limited to this, and may have other shapes that can be prevented from coming off.

The fixing member is preferably made of solder. In this case, a compressor housing that is easier to manufacture can be obtained. That is, after injecting molten solder into the concave space, the fixing member can be easily formed by cooling and solidifying the solder. Moreover, since the solidified solder has sufficient hardness, rigidity, and strength, it can sufficiently function as a fixing member.
However, in addition to solder, the fixing member can be appropriately selected from resins, brazing materials, metals such as silver, and other substances that maintain a solid state with sufficient hardness at the operating temperature of the compressor housing.

Example 1
Examples of the compressor housing for the supercharger will be described with reference to FIGS.
As shown in FIG. 1, the compressor housing 1 for the supercharger of this example includes a housing body 20, a sliding member 30, and a fixing member 4.

The housing main 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 of the impeller 10.
The sliding member 30 is an annular member that is disposed in the inner peripheral recess 21 and that forms an inner surface of the shroud surface 31 that faces the impeller 10.
The fixing member 4 is interposed between the housing body 20 and the sliding member 30 and positions and fixes them together.

The housing body 20 has a diffuser surface 24 formed on a plane orthogonal to the axial direction X on the outer peripheral side of the shroud surface 31.
As shown in FIGS. 2 to 4, the sub-assembly 100 including the housing body 20 and the sliding member 30 is formed so as to straddle the boundary line 101 between the diffuser surface 24 and the shroud surface 31 and is open to the diffuser surface 24 side. The concave space 5 is provided.
The recessed space 5 is filled with the fixing member 4.

As shown in FIG. 5, the concave space 5 and the fixing member 4 have at least one extended portion 52 in the axial direction X in which the cross-sectional area of the cross section orthogonal to the axial direction X increases as the distance from the opening 51 increases.
In this example, the concave space 5 and the fixing member 4 have a trapezoidal rotating body shape. That is, the concave space 5 and the fixing member 4 are shaped so that the upper bottom surface 41 (opening 51) which is a circular flat surface, the lower bottom surface 42 which is a circular plane having a diameter larger than the upper bottom surface 41, and the upper bottom surface 41. And an inclined surface 43 connecting the edge of the lower bottom surface 42 to the edge of the lower bottom surface 42. The inclined surface 43 is a surface constituting a part of a conical shape. As described above, in this example, the concave space 5 and the fixing member 4 have a cross-sectional area that is perpendicular to the axial direction X from the upper bottom surface 41 (opening 51) to the lower bottom surface 42 and further away from the opening 51. It has the shape which becomes. That is, in this example, the concave space 5 and the fixing member 4 are formed with one extended portion 52 over the entire axial direction X.

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.
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 FIG.
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 concave portion 220 formed in a concave shape from the first concave portion 210 to the outer peripheral side. Thereby, the inner periphery recessed part 21 is comprised so that the sliding member 30 can be arrange | positioned.

  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. 4, 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). Furthermore, as shown in FIGS. 1 to 3, the sliding member 30 includes a cylindrical sliding member main body 310 and a side opposite to the intake port 11 in the sliding member main body 310 (that is, a rear end side in the insertion direction described later). And an enlarged diameter portion 311 formed to be enlarged radially outward. The enlarged diameter portion 311 is formed in the entire circumferential direction of the sliding member 30. The sliding member 30 is disposed in the inner circumferential recess 21 with the sliding member main body 310 positioned in the first recess 210 in the inner circumferential recess 21 and the diameter-enlarged portion 311 positioned in the second recess 220.

  The sliding member 30 is press-fitted into the inner peripheral recess 21 in a state where the outer peripheral surface of the enlarged diameter portion 311 is in pressure contact with the inner peripheral surface of the second recess 220. Further, the outer diameter of the sliding member main body 310 is smaller than the inner diameter of the first recess 210, and the outer peripheral surface of the sliding member main body 310 is not in contact with the inner peripheral surface of the first recess 210.

  As shown in FIG. 4, when the compressor housing 1 is viewed from the diffuser surface 24 side in the axial direction X, the boundary line 101 between the housing body 20 and the sliding member 30, that is, the boundary line 101 between the diffuser surface 24 and the shroud surface 31 is It is formed in a circular shape. And the concave space 5 is formed in four places on this circular boundary line 101, and the fixing member 4 is filled there. The concave space 5 and the fixing member 4 are arranged at equal intervals.

  As shown in FIG. 1, when the turbocharger is configured using the compressor housing 1, the bearing housing of the impeller 10 or the end surface 70 of the back plate is located on the opposite side of the housing body 20 from the intake port 11. A diffuser portion 14 serving as a fluid passage leading from the impeller 10 side to the sucrose chamber 12 is formed between the end surface 70 and the diffuser surface 24 of the housing body 20.

  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 that protrude 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.
First, as shown in FIG. 6, the housing body 20 and the sliding member 30 are respectively molded. At this stage, the sliding member 30 does not have the shroud surface 31 (see FIGS. 1 to 3), and the inner peripheral surface 32 has a shape formed uniformly over the entire axial direction X. .

And the outer notch 53 which comprises a part of concave space 5 is formed in four places of the outer edge of the 2nd recessed part 220 in the inner peripheral recessed part 21 of the housing main body 20, respectively. The outer notch 53 is formed by cutting using, for example, an end mill.
The sliding member 30 is also formed with an inner notch 54 that constitutes a part of the recessed space 5 on the outer peripheral surface of the enlarged diameter portion 311. The inner notches 54 are also formed at four positions corresponding to the locations where the outer notches 53 are formed. The inner notch 54 is also formed by cutting using, for example, an end mill.

  Next, by inserting the sliding member 30 into the inner peripheral recess 21 of the housing main body 20, as shown in FIG. 7, the sub-assembly 100 in which the housing main body 20 and the inner peripheral recess 21 are assembled to each other is obtained. At this time, the housing main body 20 and the sliding member 30 are combined so that the outer notch 53 and the inner notch 54 overlap each other. As a result, as shown in FIGS. 7 and 8, a plurality (four) of concave spaces 5 are formed in the subassembly 100.

  Next, as shown in FIG. 9, molten solder 43 is injected into each concave space 5 and filled. At this time, the solder 43 spreads over the entire concave space 5. Then, the solder 43 slightly rises from the opening 51 of the concave space 5. Then, the solder 43 is cooled to be solidified to form the fixing member 4.

  Next, the sub assembly 100 is cut in a region from the inner peripheral surface 32 of the sliding member 30 to the diffuser surface 24 of the housing body 20 to form a shroud surface 31 and solidified solder as shown in FIG. The surface exposed from the opening surface 51 in 43 (fixing member 4) is ground. Thereby, a continuous surface without a step is formed from the intake port 11 through the intake passage 12 and the shroud surface 31 to the diffuser surface 24. Thus, as shown in FIG. 1, the compressor housing 1 in which the sliding member 30 is fixed to the housing body 20 is obtained.

  The concave space 5 may be formed after assembling the sub-assembly including the housing body 20 and the sliding member 30. That is, after the sliding member 30 is assembled to the housing body 20, a cylindrical hole is drilled at a predetermined location on the boundary line 101 between the diffuser surface 24 and the shroud surface 31, and a trapezoidal rotating body is formed by contouring. The contour of the concave space 5 is adjusted. Also by this, the concave space 5 can be formed.

Next, the function and effect of this example will be described.
In the compressor housing 1, the sub-assembly 100 including the housing body 20 and the sliding member 30 is provided with the concave space 5 in a part on the boundary line 101 between the diffuser surface 24 and the shroud surface 31. 5 is filled with the fixing member 4. Thereby, the sliding member 30 can be reliably fixed to the housing body 20 with a simple configuration.

  In other words, the recessed space 5 and the fixing member 4 have at least one extended portion 52 in the axial direction X in which the cross-sectional area of the cross section perpendicular to the axial direction X increases as the distance from the opening 51 increases. Therefore, the fixing member 4 filled in the concave space 5 does not come out of the opening 51 and reliably stays in the concave space 5. If this state is maintained, the sliding member 30 is securely fixed to the housing body 20 by the fixing member 4. Therefore, the sliding member 30 does not shift in the axial direction X or the circumferential direction with respect to the housing body 20.

  Moreover, since the concave space 5 is opened to the diffuser surface 24 side, it is not particularly necessary to provide an injection path for filling the concave space 5 with the fixing member 4 or an air vent hole for extracting air. Therefore, the compressor housing 1 can have a simple configuration and can be easily manufactured.

  Moreover, the concave space 5 and the fixing member 4 have a trapezoidal rotating body shape as shown in FIG. Therefore, the concave space 5 can be easily formed, and the fixing state of the housing body 20 and the sliding member 30 by the fixing member 4 can be further stabilized.

  Further, since the fixing member 4 is made of solder, the compressor housing 1 can be made easier to manufacture. That is, after injecting the molten solder 43 into the concave space 5, the fixing member 4 can be easily formed by cooling and solidifying the solder 43. Moreover, since the solidified solder has sufficient hardness, rigidity, and strength, it can sufficiently function as a fixing member.

  As described above, according to this example, it is possible to provide a compressor housing for a supercharger having a simple configuration and easy to manufacture.

(Example 2)
In this example, as shown in FIG. 10, the shapes of the recessed space 5 and the fixing member 4 are changed.
In other words, in the compressor housing 1 of the present example, the recessed portion 5 and the fixing member 4 include the extended portions 52 in which the cross-sectional area of the cross section perpendicular to the axial direction X increases as the distance from the opening 51 increases. Have.

In this example, in particular, the concave space 5 and the fixing member 4 have a shape in which large diameter portions 55 having a large diameter and small diameter portions 56 having a small diameter are alternately formed. Further, the concave space 5 and the fixing member 4 have a rotating body shape in which the shape of the cross section orthogonal to the axial direction X is circular.
Others are the same as in the first embodiment. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

  Also in the case of this example, a compressor housing for a supercharger having a simple configuration and easy to manufacture can be provided.

(Example 3)
In this example, as shown in FIG. 11, the concave space 5 and the fixing member 4 have a spiral shape (screw hole shape).
In forming the concave space 5, for example, after the sliding member 30 is assembled to the housing body 20, a screw hole is cut at a predetermined position on the boundary line 101 between the diffuser surface 24 and the shroud surface 31. be able to.
Others are the same as in the first embodiment. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

  Also in the case of this example, a compressor housing for a supercharger having a simple configuration and easy to manufacture can be provided.

  In addition, if the concave space and the fixing member have a shape having an extended portion in which the cross-sectional area of the cross section orthogonal to the axial direction increases as the distance from the opening portion increases, at least one location in the axial direction is included in the above embodiment. Without limitation, various shapes can be adopted.

DESCRIPTION OF SYMBOLS 1 Compressor housing for superchargers 20 Housing main body 21 Inner peripheral recessed part 24 Diffuser surface 30 Sliding member 31 Shroud surface 4 Fixing member 5 Recessed space 51 Opening part 52 Expansion part X Axial direction

Claims (3)

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 fixing member interposed between the housing body and the sliding member and positioning and fixing the two to each other;
The housing body has a diffuser surface formed on a plane orthogonal to the axial direction on the outer peripheral side of the shroud surface,
The sub-assembly consisting of the housing body and the sliding member is formed so as to straddle the boundary line between the diffuser surface and the shroud surface, and is provided with a concave space opened to the diffuser surface side.
The concave space is filled with the fixing member,
The compressor for a supercharger characterized in that the concave space and the fixing member have an extended portion whose cross-sectional area perpendicular to the axial direction increases as the distance from the opening increases, at least at one location in the axial direction. housing.   The compressor housing for a supercharger according to claim 1, wherein the concave space and the fixing member have a trapezoidal rotating body shape.   3. The compressor housing for a supercharger according to claim 1, wherein the fixing member is made of solder.

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