JP5928271B2 - Compressor housing for supercharger and method for manufacturing the same - Google Patents

Description

  The present invention relates to a compressor housing for a supercharger configured to accommodate an impeller having a plurality of blades, and a method for manufacturing the same.

  A compressor (compressor) used for a turbocharger such as a turbocharger of an automobile is configured to be able to accommodate an impeller having a plurality of blades, and is discharged from an inlet and an impeller that sucks air toward the impeller. It has a compressor housing provided with a scroll chamber or the like for introducing air.

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

Therefore, conventionally, a structure in which a sliding member made of resin or the like is attached to a portion of the compressor housing that forms the shroud surface has been proposed (see Patent Documents 1 and 2).
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 the swing of the impeller rotating shaft, the sliding member attached to the portion that forms the shroud surface is only scraped. The gap between the blades and the shroud surface of the compressor housing remains small.

JP 20012344753 A Japanese Patent Laid-Open No. 11-173153

However, in Patent Documents 1 and 2, etc., the sliding member is fixed to the compressor housing using a bolt, a snap ring, or the like. Therefore, the structure itself becomes complicated. In addition, the number of parts increases and the cost increases.
In order to solve the above problem, for example, in a compressor housing composed of a plurality of parts such as a scroll piece and a shroud piece, the shroud piece is press-fitted into the scroll piece and at the same time slipped against the shroud piece. A method of pressing and fixing the member is conceivable. However, in this case, a part for fixing the sliding member is not necessary, but the sliding member to be press-fitted due to a positional deviation of each part may be scraped and deformed.

  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 capable of accurately and reliably fixing a sliding member with a simple configuration and a method for manufacturing the same. .

One aspect of the present invention is configured to be capable of accommodating a turbocharger impeller having a plurality of blades, and introduces an air inlet that sucks air toward the impeller and air discharged from the impeller A compressor housing for a supercharger comprising a scroll chamber
A scroll piece that forms the intake port and the scroll chamber, a cylindrical shroud piece that covers the outer periphery of the impeller, and a shroud surface that is disposed between the impeller and the shroud piece and faces the impeller An annular sliding member forming
On the inner peripheral surface of the shroud piece, an enlarged inner peripheral surface portion whose inner diameter gradually increases toward the intake side is formed,
On the outer peripheral surface of the sliding member, an enlarged outer peripheral surface portion whose outer diameter gradually increases toward the intake side is formed,
The sliding member is press-fitted into the shroud piece in a state where the expanded outer peripheral surface portion is in contact with the expanded inner peripheral surface portion of the shroud piece,
The scroll piece is provided with a press-fit portion into which the shroud piece is press-fitted,
The supercharger, wherein the shroud piece is press-fitted into the press-fitted portion of the scroll piece in a state where the sliding member press-fitted into the shroud piece is sandwiched between the shroud piece and the scroll piece. A compressor housing (claim 1).

Another aspect of the present invention is configured to be capable of accommodating a turbocharger impeller having a plurality of blades, and introduces an air inlet for sucking air toward the impeller and air discharged from the impeller. A method of manufacturing a compressor housing for a supercharger comprising a scroll chamber that includes:
A sliding member press-fitting step of press-fitting an annular sliding member forming a shroud surface facing the impeller into a cylindrical shroud piece covering the outer peripheral side of the impeller;
The shroud piece in a state in which the sliding member is press-fitted is press-fitted into a press-fit portion provided in a scroll piece that forms the intake port and the scroll chamber, and the sliding member is inserted between the shroud piece and the scroll piece. A shroud piece press-fitting process sandwiched between,
In the sliding member press-fitting step, an enlarged outer peripheral surface portion having an outer diameter gradually increasing toward the intake side formed on the outer peripheral surface of the sliding member is directed toward the intake side formed on the inner peripheral surface of the shroud piece. In the method of manufacturing a compressor housing for a supercharger, the sliding member is press-fitted into the shroud piece by being inserted from the intake side into an enlarged inner peripheral surface portion where the inner diameter gradually increases. (Claim 3).

  In the compressor housing for the supercharger, the shroud piece is press-fitted into the scroll piece in a state where the sliding member press-fitted into the shroud piece is sandwiched between the scroll piece. And this clamping state is formed in the state which the said enlarged diameter inner peripheral surface part formed in the inner peripheral surface of the said shroud piece and the said enlarged diameter outer peripheral surface part formed in the outer peripheral surface of the said sliding member are surface-contacted. . That is, the expanded inner peripheral surface portion of the shroud piece is in a state of covering the expanded outer peripheral surface portion of the sliding member from the side opposite to the scroll piece, and the sliding member is positioned between the scroll piece by the shroud piece. Will be held.

  Since the holding structure for the sliding member can be formed by the enlarged inner peripheral surface portion of the shroud piece and the enlarged outer peripheral surface portion of the sliding member, the shroud piece and the scroll piece have complicated shapes. It is not necessary to provide a fixing member for fixing the sliding member. As a result, the sliding member can be reliably fixed with a simple configuration, the sliding member can be prevented from coming off and falling off, and the production cost can be suppressed without increasing the number of parts.

  In addition, since the above-mentioned configuration is adopted, when the sliding member is press-fitted into the shroud piece, the expanded outer peripheral surface portion of the sliding member is inserted into the expanded inner peripheral surface portion of the shroud piece from the intake side. By doing so, the said enlarged diameter inner peripheral surface part which is diameter-reduced toward the direction (insertion direction) on the opposite side to an inhalation | air-intake side becomes a guide, and can press-fit the said sliding member smoothly. Moreover, since the said enlarged diameter inner peripheral surface part and the said enlarged diameter outer peripheral surface part which are press-fit parts become a shape which expands in the mutually same direction, the said sliding member can be press-fitted in the said shroud piece with a sufficient precision. it can. Thereby, the coaxial shift | offset | difference of the said sliding member and the said shroud piece, the dispersion | variation in the press-fit position with respect to the said shroud piece of the said sliding member, etc. can be suppressed.

  In the method of manufacturing a compressor housing for a supercharger, in the sliding member press-fitting step, the enlarged diameter outer peripheral surface portion formed on the outer peripheral surface of the sliding member is replaced with the enlarged member formed on the inner peripheral surface of the shroud piece. Insert into the inner diameter surface from the intake side. Therefore, the diameter-enlarged inner peripheral surface portion that is reduced in diameter in the direction opposite to the intake side (insertion direction) serves as a guide, and the sliding member can be smoothly press-fitted. Moreover, since the said enlarged diameter inner peripheral surface part and the said enlarged diameter outer peripheral surface part which are press-fit parts become a shape which expands in the mutually same direction, the said sliding member can be press-fitted in the said shroud piece with a sufficient precision. it can. Thereby, the coaxial shift | offset | difference of the said sliding member and the said shroud piece, the dispersion | variation in the press-fit position with respect to the said shroud piece of the said sliding member, etc. can be suppressed.

  In the shroud piece press-fitting step, the shroud piece in a state where the sliding member is press-fitted is press-fitted into the press-fitted portion of the scroll piece, and the sliding member is interposed between the shroud piece and the scroll piece. Hold it. And as above-mentioned, this clamping state is implement | achieved by the said diameter expansion inner peripheral surface part of the said shroud piece, and the said diameter expansion outer peripheral surface part of the said sliding member. Therefore, the sliding member can be reliably fixed with a simple configuration, and the sliding member can be prevented from coming off or falling off. Further, unlike the prior art, no part or the like for fixing the sliding member is required, so that the production cost can be suppressed without increasing the number of parts.

  As described above, it is possible to provide a compressor housing for a supercharger that can accurately and reliably fix the sliding member with a simple configuration and a method for manufacturing the same.

Explanatory drawing which shows the whole structure of the compressor housing in an Example. Explanatory drawing which shows a mode that the sliding member in an Example is press-fitted in a shroud piece. Explanatory drawing which shows a mode that the shroud piece of the state which press-fitted the sliding member in an Example is press-fitted in a scroll piece.

  In the compressor housing and the manufacturing method thereof, the outer diameter and inner diameter of the sliding member and the enlarged inner surface of the shroud piece are gradually increased toward the intake side (intake side). The outer diameter and the inner diameter gradually decrease in the opposite direction), and can be formed into a tapered shape, a curved surface shape, or the like.

Moreover, the said sliding member forms the said shroud surface facing the said impeller. The sliding member plays a role of maintaining the gap between the blade of the impeller and the shroud surface as small as possible.
For example, when the blades of the impeller come into contact with the shroud surface due to vibration, vibration of the impeller rotation shaft, or the like, the sliding member that forms the shroud surface is scraped. The gap between the blade of the impeller and the shroud surface is kept small.

  In addition, as described above, the material constituting the sliding member needs to be scraped when the blade of the impeller contacts the shroud surface, for example, nylon (registered trademark), Resins such as polyester and polyimide, ceramics, and the like can be used.

In the compressor housing, it is preferable that the shroud piece is press-fitted outward with respect to the press-fitted portion of the scroll piece.
In this case, it becomes easy to press-fit the shroud piece into the press-fit portion of the scroll piece in a state where the sliding member is press-fitted into the shroud piece.

In the compressor housing manufacturing method, it is preferable that in the shroud piece press-fitting step, the shroud piece is press-fitted outward with respect to the press-fitted portion of the scroll piece.
In this case, in the shroud piece press-fitting step, it is easy to press-fit the shroud piece in a state where the sliding member is press-fitted into the press-fitted portion of the scroll piece.

Embodiments of the compressor housing for the supercharger and the method for manufacturing the same will be described with reference to the drawings.
As shown in FIG. 1, the compressor housing 1 of this example forms an outer shell of a compressor (compressor) 8 used in a turbocharger (supercharger) of an automobile, and includes an impeller 5 having a plurality of blades 52. And an air inlet 11 that sucks air A1 toward the impeller 5 and a scroll chamber 12 that introduces air A2 discharged from the impeller 5.

As shown in the figure, the compressor housing 1 includes a scroll piece 2 that forms an intake port 11 and a scroll chamber 12, a cylindrical shroud piece 3 that covers the outer peripheral side of the impeller 5, and the impeller 5 and the shroud piece 3. And an annular sliding member 4 that forms a shroud surface 400 that faces the impeller 5.
In this example, the scroll piece 2 and the shroud piece 3 are made of an aluminum die-cast product. The sliding member 4 is made of a polyimide resin.

The scroll piece 2 forms a cylindrical intake port forming portion 21 that forms the intake port 11, and an intake passage 221 that communicates with the intake port 11, and a cylindrical press-fit portion 22 into which the shroud piece 3 is press-fitted outside. And a scroll chamber forming portion 23 for forming the scroll chamber 12.
The press-fit portion 22 is formed with a first contact surface 222 that contacts the shroud piece 3 and a second contact surface 223 that contacts the sliding member 4.

The shroud piece 3 includes a press-fit portion 31 that is press-fitted outward with respect to the press-fit portion 22 of the scroll piece 2, and a diffuser portion 32 that forms a diffuser surface 321 extending from the shroud surface 400 of the sliding member 4 toward the scroll chamber 12. Have
The press-fit portion 31 is formed with an abutment surface 311 that abuts on the first abutment surface 222 of the press-fit portion 22 of the scroll piece 2. The inner peripheral surface 301 of the shroud piece 3 has an intake side X1. An enlarged inner peripheral surface portion 301a whose inner diameter gradually increases toward is formed. In this example, the expanded inner peripheral surface portion 301a is formed in a tapered shape.

  A shroud surface 400 facing the impeller 5 is formed on the inner peripheral surface 401 of the sliding member 4. The shroud surface 400 of the sliding member 4 is formed into a convex curved surface in a cross section including the rotation center axis X of the impeller 5, and the inner peripheral surface 220 of the press-fit portion 22 of the scroll piece 2 and the shroud piece 3. It is continuous with the diffuser surface 321 of the diffuser part 32.

Further, the outer peripheral surface 402a of the sliding member 4 is formed with an enlarged outer peripheral surface portion 402a whose outer diameter gradually increases toward the intake side X1. In this example, the enlarged diameter outer peripheral surface portion 402 a is formed in a tapered shape along the shape of the enlarged diameter inner peripheral surface portion 301 a of the shroud piece 3.
Further, the sliding member 4 is formed with a contact surface 403 that contacts the second contacted surface 223 of the press-fit portion 22 of the scroll piece 2.

In the compressor housing 1, the sliding member 4 is press-fitted into the shroud piece 3 with the expanded outer peripheral surface portion 402 a in contact with the expanded inner peripheral surface portion 301 a of the shroud piece 3.
Further, the shroud piece 3 is press-fitted into the press-fit portion 22 of the scroll piece 2 in a state where the sliding member 4 press-fitted into the shroud piece 3 is sandwiched between the shroud piece 3 and the scroll piece 2. Specifically, the sliding member 4 is sandwiched between the enlarged inner peripheral surface portion 301 a of the shroud piece 3 and the second contacted surface 223 of the press-fit portion 22 of the scroll piece 2. Further, the press-fit portion 31 of the shroud piece 3 is press-fitted outward with respect to the press-fit portion 22 of the scroll piece 2, and the contact surface 311 of the press-fit portion 31 is brought into contact with the first contact surface 222 of the press-fit portion 22. It is in contact.

  As shown in the figure, the impeller 5 is disposed on the inner peripheral side of the shroud piece 3 and is attached so as to be rotatable about the rotation shaft 50. Further, the impeller 5 projects a plurality of blades 52 arranged in the circumferential direction from the outer peripheral surface of the hub 51. The plurality of blades 52 are disposed to face the shroud surface 400 of the sliding member 4.

A back plate portion 61 is provided at a position facing the diffuser surface 321 of the diffuser portion 32 of the shroud piece 3 to cover the side opposite to the intake side X1 (discharge side X2) of the compressor housing 1.
Further, between the diffuser surface 321 of the diffuser portion 32 of the shroud piece 3 and the back plate portion 61, a diffuser portion 13 that boosts the air A <b> 2 discharged from the impeller 5 is formed.

  Further, in the compressor 8 having the compressor housing 1 configured as described above, the air A1 is sucked into the impeller 5 from the intake port 11 through the intake passage 221 by the rotation of the impeller 5. The air A <b> 2 accelerated by the blade 52 of the impeller 5 and discharged from the impeller 5 is pressurized in the diffuser unit 13 and introduced into the scroll chamber 12.

Next, the manufacturing method of the compressor housing 1 of this example is demonstrated.
First, as shown in FIG. 2, the annular sliding member 4 is press-fitted into a cylindrical shroud piece 3 formed by die casting (sliding member press-fitting step).
At this time, by inserting the enlarged diameter outer peripheral surface portion 402a formed on the outer peripheral surface 402 of the sliding member 4 from the intake side X1 into the enlarged diameter inner peripheral surface portion 301a formed on the inner peripheral surface 301 of the shroud piece 3, The sliding member 4 is press-fitted into the shroud piece 3.

Next, as shown in FIG. 3, the shroud piece 3 in which the sliding member 4 is press-fitted is press-fitted into the press-fit portion 22 of the scroll piece 2 formed by die casting, and the sliding member 4 is pressed into the shroud piece 3 and the scroll piece 2. (Shroud piece press-fitting process).
Specifically, the shroud piece 3 is inserted into the scroll piece 2 from the discharge side X2, and the press-fit portion 31 is press-fitted outside the press-fit portion 22. The contact surface 311 of the press-fit portion 31 is brought into contact with the first contacted surface 222 of the press-fit portion 22, and the contact surface 403 of the sliding member 4 is contacted with the second contacted surface 223 of the press-fit portion 22. Abut.
Thus, the compressor housing 1 shown in FIG. 1 is obtained.

  In this example, as shown in FIG. 3, the shroud piece 3 is press-fitted into the scroll piece 2 in a state in which the sliding member 4 is completely press-fitted into the inner diameter surface 301 a of the shroud piece 3. The member 4 is placed in a state where it is press-fitted halfway in the diameter-enlarged inner peripheral surface portion 301a of the shroud piece 3 (temporary press-fitted state), and when the shroud piece 3 is press-fitted into the scroll piece 2, The sliding member 4 can be further pushed in by the contact surface 223 and can be completely press-fitted into the enlarged diameter inner peripheral surface portion 301 a of the shroud piece 3.

Next, the effect in the compressor housing 1 of this example and its manufacturing method is demonstrated.
In the compressor housing 1 of this example, the shroud piece 3 is press-fitted into the scroll piece 2 with the sliding member 4 press-fitted into the shroud piece 3 being sandwiched between the scroll piece 2. And this clamping state is formed in a state where the enlarged diameter inner peripheral surface portion 301a formed on the inner peripheral surface 301 of the shroud piece 3 and the enlarged diameter outer peripheral surface portion 402a formed on the outer peripheral surface 402 of the sliding member 4 are in surface contact. Is done. That is, the diameter-enlarged inner peripheral surface portion 301 a of the shroud piece 3 is covered with the diameter-enlarged outer peripheral surface portion 402 a of the sliding member 4 from the side opposite to the scroll piece 2. Will be held.

  Since such a holding structure of the sliding member 4 can be formed by the enlarged inner peripheral surface portion 301a of the shroud piece 3 and the enlarged outer peripheral surface portion 402a of the sliding member 4, the shroud piece 3 and the scroll piece 2 have complicated shapes. It is not necessary to provide a fixing member or a fixing member for fixing the sliding member 4. As a result, the sliding member 4 can be reliably fixed with a simple configuration, the sliding member 4 can be prevented from coming off and falling off, and the production cost can be suppressed without increasing the number of parts.

  In addition, since the sliding member 4 is press-fitted into the shroud piece 3 due to the above configuration, the enlarged outer peripheral surface portion 402a of the sliding member 4 is inserted into the enlarged inner peripheral surface portion 301a of the shroud piece 3 from the intake side X1. By inserting, the diameter-enlarged inner peripheral surface portion 301a that decreases in diameter in the direction (insertion direction) opposite to the intake side X1 (discharge side X2) serves as a guide, and the press-fitting of the sliding member 4 is smoothly performed. It can be carried out. Moreover, since the diameter-enlarged inner peripheral surface portion 301a and the diameter-enlarged outer peripheral surface portion 402a, which are press-fit portions, have shapes that expand in diameter in the same direction, the sliding member 4 can be accurately press-fitted into the shroud piece 3. it can. Thereby, the coaxial shift | offset | difference of the sliding member 4 and the shroud piece 3, the dispersion | variation in the press-fit position with respect to the shroud piece 3 of the sliding member 4 can be suppressed.

  In this example, the shroud piece 3 is press-fitted outside the press-fit portion 22 of the scroll piece 2. Therefore, it becomes easy to press-fit the shroud piece 3 into the press-fit portion 22 of the scroll piece 2 while the sliding member 4 is press-fitted into the shroud piece 3.

  Thus, according to this example, it is possible to provide a compressor housing 1 for a supercharger that can accurately and reliably fix the sliding member 4 with a simple configuration and a method for manufacturing the same.

DESCRIPTION OF SYMBOLS 1 Compressor housing 11 Intake port 12 Scroll chamber 2 Scroll piece 22 Press-fit part 3 Shroud piece 301 Inner peripheral surface (inner peripheral surface of shroud piece)
301a Diameter expansion inner peripheral surface part 4 Sliding member 400 Shroud surface 402 Outer peripheral surface (outer peripheral surface of sliding member)
402a Expanded outer peripheral surface part 5 Impeller

Claims (4)

A turbocharger impeller having a plurality of blades is configured to be accommodated, and is provided with an intake port that sucks air toward the impeller and a scroll chamber that introduces air discharged from the impeller. In the compressor housing for the feeder,
A scroll piece that forms the intake port and the scroll chamber, a cylindrical shroud piece that covers the outer periphery of the impeller, and a shroud surface that is disposed between the impeller and the shroud piece and faces the impeller An annular sliding member forming
On the inner peripheral surface of the shroud piece, an enlarged inner peripheral surface portion whose inner diameter gradually increases toward the intake side is formed,
On the outer peripheral surface of the sliding member, an enlarged outer peripheral surface portion whose outer diameter gradually increases toward the intake side is formed,
The sliding member is press-fitted into the shroud piece in a state where the expanded outer peripheral surface portion is in contact with the expanded inner peripheral surface portion of the shroud piece,
The scroll piece is provided with a press-fit portion into which the shroud piece is press-fitted,
The supercharger, wherein the shroud piece is press-fitted into the press-fitted portion of the scroll piece in a state where the sliding member press-fitted into the shroud piece is sandwiched between the shroud piece and the scroll piece. Compressor housing for   2. The compressor housing according to claim 1, wherein the shroud piece is press-fitted outward with respect to the press-fitted portion of the scroll piece. A turbocharger impeller having a plurality of blades is configured to be accommodated, and is provided with an intake port that sucks air toward the impeller and a scroll chamber that introduces air discharged from the impeller. A method of manufacturing a compressor housing for a feeder, comprising:
A sliding member press-fitting step of press-fitting an annular sliding member forming a shroud surface facing the impeller into a cylindrical shroud piece covering the outer peripheral side of the impeller;
The shroud piece in a state in which the sliding member is press-fitted is press-fitted into a press-fit portion provided in a scroll piece that forms the intake port and the scroll chamber, and the sliding member is inserted between the shroud piece and the scroll piece. A shroud piece press-fitting process sandwiched between,
In the sliding member press-fitting step, an enlarged outer peripheral surface portion having an outer diameter gradually increasing toward the intake side formed on the outer peripheral surface of the sliding member is directed toward the intake side formed on the inner peripheral surface of the shroud piece. A method of manufacturing a compressor housing for a supercharger, wherein the sliding member is press-fitted into the shroud piece by being inserted from the intake side into an enlarged inner peripheral surface portion where the inner diameter gradually increases.   The compressor housing manufacturing method according to claim 3, wherein, in the shroud piece press-fitting step, the shroud piece is press-fitted outward with respect to the press-fitted portion of the scroll piece. Manufacturing method of housing.

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