JP2013019271A - Housing assembling structure of guide vane unit and supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fix a guide vane unit in a housing with a simple configuration.SOLUTION: A housing assembling structure of a guide vane unit has a housing 3 with a stepped portion 10 formed in a suction port 7 of a compressor impeller, and a guide vane unit 2 fitted to the stepped portion 10 of the housing 3. The guide vane unit 2 supports the shafts 22 of guide vanes 1 so as to rotatably hold them between a bearing ring 14, which is divided by opposite faces, and a press ring 15. The shaft 22 of one of the guide vanes 1 is driven by a rotating shaft which passes a through-hole 28 provided in the housing 3. The housing assembling structure includes a radial fixing means 37 for restraining radial movement of the guide vane unit 2 fitted to the stepped portion 10 of the housing 3, and an axial fixing means 40 restraining axial movement of the guide vane unit 2.

Description

  The present invention relates to a housing assembly structure for a guide vane unit and a supercharger.

  Generally, in a supercharger, a turbine impeller and a compressor impeller are arranged on the same rotation shaft, and the compressor impeller is rotated by a rotational drive of the turbine impeller so as to improve the performance of the internal combustion engine.

  The compressor impeller is disposed in a housing, and the housing is configured to be able to supply intake air sucked into the flow path to a diffuser or the like by the action of centrifugal force generated by the rotation of the compressor impeller.

  The housing located on the upstream side of the compressor impeller is equipped with a plurality of variable inlet guide vanes (hereinafter referred to as guide vanes) in a cylindrical internal flow path into which intake air flows. It is considered that the opening of the guide vane is adjusted to rectify the incident angle of the compressor impeller (for example, see Patent Documents 1-3).

Japanese Patent Laid-Open No. 2006-46220 JP 2004-190557 A JP 2004-162716 A

  However, since it is not easy to install guide vanes directly in the housing, a guide vane unit in which guide vanes are arranged in advance is constructed, and the guide vanes are installed by inserting and fixing the guide vane unit in the housing. Is considered. However, in this case, since the guide vane unit needs to be fixed by restricting radial movement with respect to the inside of the housing, and fixed by restricting axial movement, this fixing is technically necessary. This is difficult, and when a complicated structure is provided for fixing, there is a problem that the number of parts increases and the number of assembly steps of the compressor also increases.

  SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a guide vane unit housing assembly structure and a supercharger that can fix the guide vane unit in the housing with a simple configuration. is there.

The present invention includes a housing in which a step portion is formed at a suction port of a compressor impeller, and a guide vane unit that is fitted and installed in the step portion of the housing, and the guide vane unit is divided by an opposing surface. A housing assembly structure of the guide vane unit configured to sandwich and support the shaft of the guide vane between the bearing ring and the presser ring which are rotatably supported,
A radial fixing means for restricting the radial movement of the guide vane unit fitted in the stepped portion of the housing; and an axial fixing means for restricting the axial movement of the guide vane unit. This relates to a housing assembly structure for a guide vane unit.

  In the housing assembly structure of the guide vane unit, the radial direction fixing means may be an inlay fixing portion in which the guide vane unit is fitted into a step portion of the housing by a tightening fit, or the guide vane is fixed to the step portion of the housing. You may consist of the clearance gap which the unit fitted through the clearance gap, and the rotation prevention means which stops rotation of the said guide vane unit with a pin.

  Further, in the housing assembly structure of the guide vane unit, the axial direction fixing means is a retaining ring made of an elastic material fitted into an annular locking groove formed in a step portion of the housing, and the locking groove The retaining ring has an inclined surface that acts to move toward the guide vane unit by pushing the diameter of the retaining ring and push the guide vane unit into the stepped portion.

  Further, in the housing assembly structure of the guide vane unit, the radial direction fixing means is an inlay fixing portion in which the guide vane unit is fitted into the stepped portion of the housing by tightening, and the radial direction by the inlay fixing portion is The fixing means may also serve as the axial direction fixing means.

  The present invention relates to a supercharger having a housing assembly structure for the guide vane unit.

  According to the housing assembly structure and the supercharger of the guide vane unit of the present invention, the guide vane unit can be reliably fixed in the radial direction and the axial direction with respect to the inside of the housing with a simple configuration.

(A) is a cut side view showing an example of the radial fixing means when the housing and the guide vane unit are made of metal, and (b) is a cut side view showing another example of the radial fixing means of (a). . It is a cutaway side view which shows the radial direction fixing means in case at least one of a housing and a guide vane unit is resin. (A) is an operation explanatory view showing a state in which the outer peripheral edge of the retaining ring is fitted into the locking groove constituting the axial fixing means, and (b) is a diagram showing that the retaining ring is moved by the retaining ring entering the locking groove. It is effect | action explanatory drawing which shows the state which moves and pushes a guide vane unit into a step part. It is a front view of a retaining ring. It is a cutting side view showing the compressor of the supercharger with which the engine for vehicles which applies the present invention is equipped. It is a side view which shows the state which assembles a guide vane unit. It is a top view of a bearing ring. It is a cutting | disconnection side surface which shows the other example of a pressing means. It is a cutting | disconnection side view which shows the other structural example of the guide vane unit to which this invention is applied. (A) is an operation explanatory view showing a state where the guide vane of FIG. 9 is in the minimum opening posture, and (b) is an operation explanatory view showing a state where the opening degree of the guide vane is increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 7 show an embodiment of the present invention, in which a guide vane unit 2 incorporating a guide vane 1 is fitted and installed in a step 10 provided in the housing 3, and a through hole provided in the housing 3 The compressor 4 is configured such that one shaft 22 of the guide vane 1 is rotated through a rotation shaft 29 from the outside.

  As shown in FIG. 5, the compressor 4 includes a compressor impeller 5 inside the housing 3, and the compressor impeller 5 is a rotating shaft 6 coaxial with a turbine impeller (not shown) that is rotated by exhaust of an automobile engine. Rotate by. A suction port 7 extending forward from the outer periphery of the compressor impeller 5 in the suction direction is formed inside the housing 3, and a scroll 9 is formed through the diffuser 8 so as to be connected to the rear portion of the suction port 7. The air whose speed has been increased by the compressor impeller 5 is converted into pressure and guided from the diffuser 8 to the scroll 9.

  Further, the housing 3 of the compressor 4 is formed with a stepped portion 10 which is formed in a cylindrical shape with a diameter increased from the suction port 7 so as to be positioned on the front inner side of the compressor impeller 5. The guide vane unit 2 in which the guide vane 1 is arranged is inserted. The pin hole 11a on the insertion end face of the guide vane unit 2 is provided with anti-rotation means 11 such as a split pin. By inserting the split pin into the pin hole 11b provided on the bottom surface 10b of the stepped portion 10, a guide is provided. The vane unit 2 is attached to the step portion 10 by performing circumferential positioning (rotation prevention).

  As shown in FIGS. 5 and 6, the guide vane unit 2 includes a rear bearing ring 14 and a front presser ring 15 which are divided forward and backward by opposing surfaces 13a and 13b. Here, the manufacturing cost can be reduced by manufacturing the bearing ring 14 and the presser ring 15 with a cast product such as sintered metal, aluminum die-casting, or a resin.

  As shown in FIGS. 5 and 7, annular grooves 16 and 17 are formed in the facing surfaces 13 a and 13 b of the bearing ring 14 and the presser ring 15, respectively. As shown in FIG. 7, each annular groove 16 includes a peripheral bottom surface 18, an inner side wall 19 located on the unit opening 12 side, and an outer side wall 20 located on the outer peripheral side. Further, the inner wall 19 of the bearing ring 14 and the presser ring 15 has a polygonal cross section in a radial direction (a heptagon in FIG. 7) and a corner of the polygon is a curved surface. Further, the outer wall 20 has a circular cross section in the radial direction, like the outer peripheral surface of the guide vane unit 2.

  As shown in FIGS. 5 and 6, the shaft of the guide vane 1 is arranged between the bearing ring 14 and the presser ring 15 so that the blade portions 21 of the plurality of guide vanes 1 are arranged radially in the circumferential direction of the unit opening 12. 22 is supported at equal intervals. That is, a U-shaped bearing recess 23 having a depth capable of accommodating the shaft 22 of the guide vane 1 is formed on the facing surface 13a of the inner wall 19 and the outer wall 20 of the bearing ring 14 as shown in FIGS. A flat surface 24 is formed on the opposed surface 13b of the inner wall 19 and the outer wall 20 of the presser ring 15 so as to pivotably sandwich the shaft 22 of the guide vane 1 between the bearing recess 23 of the bearing ring 14. ing. Further, a ring gear 26 is disposed on the bottom surface 18 of the annular ring 16 in the bearing ring 14 via pressing means 25 such as a wave washer as shown in FIG. 1 pinion 27 is engaged.

  Instead of the wave washer 26, a coil spring 45 as shown in FIG. 8 can be used. When the coil spring 32 is used, it is preferable to provide a groove 45 a for positioning the coil spring 45 on the bottom surface of the annular groove 13 and the rear end surface of the ring gear 25.

  Further, a through hole 28 is formed at a position of the housing 3 corresponding to the shaft 22 of one guide vane 1, and a rotation shaft 29 is inserted into the through hole 28 from the outside, and the rotation is performed. A concave end surface 29 a provided at the end of the shaft 29 and a convex end surface 22 a provided on the shaft 22 are engaged and connected. An arm 30 having a connection pin 31 for rotating the rotation shaft 29 is fixed to the outer end of the rotation shaft 29, and the connection pin 31 is pushed and pulled by an actuator (not shown) to rotate the rotation pin 29. The moving shaft 29 is rotated. When the rotation shaft 29 rotates, the ring gear 26 rotates through the pinion 27 of one guide vane 1, and all the guide vanes 1 rotate together by the rotation of the ring gear 26. Here, the shaft 22 of the guide vane 1 is provided with a protrusion 32 for restraining the movement of the guide vane 1 in the axial direction by sandwiching the inner wall 19.

  Further, the opposing surfaces 13a and 13b of the bearing ring 14 and the presser ring 15 are provided with an integration means 34 that can be fitted to each other and integrated by fixing the bearing ring 14 and the presser ring 15 in the radial direction and the axial direction. . As the integration means 34, a plurality of engaging recesses 33a (two in FIG. 7) are provided on the opposing surface 13a of the outer wall 20 of the bearing ring 14 as shown in FIG. The opposing surface 13b of the outer wall 20 in the ring 15 is provided with a plurality of engaging convex portions 33b (two in FIG. 6), and the engaging concave portions 33a and the engaging convex portions 33b are fitted and plastically deformed. Thus, the bearing ring 14 and the presser ring 15 are assembled together. In order to position the bearing ring 14 and the presser ring 15, the number of the engagement recesses 33 a and the engagement protrusions 33 b is two or more. When the guide vane unit 2 is made of metal, the bearing ring 14 and the presser ring 15 can be integrated by the integration means 34 that plastically deforms the engagement concave portion 33a and the engagement convex portion 33b. According to this integration means 34, the bearing ring 14 and the presser ring 15 can be fixed in the radial direction and can also be fixed in the axial direction. On the other hand, when the guide vane unit 2 is made of resin, cracking may occur when plastically deformed, and therefore an integrated method by plastic deformation cannot be adopted. For this reason, when the guide vane unit 2 is made of resin, the engaging concave portion 33a and the engaging convex portion 33b are integrated with each other using an adhesive.

  The guide vane unit 2 is configured such that, after the shaft 22 of the guide vane 1 is fitted and disposed in each bearing recess 23 provided in the bearing ring 14 as shown in FIG. The guide ring unit 2 is assembled by fastening the bearing ring 14 and the presser ring 15 so that 33b is engaged. The guide vane unit 2 can be installed by being fitted to the step portion 10 of the housing 3 as shown in FIG.

  At this time, the guide vane unit 2 fitted to the step portion 10 of the housing 3 needs to be fixed so as not to move in the radial direction and the axial direction within the step portion 10.

  First, the radial fixing means will be described. FIG. 1A shows radial fixing means when the housing 3 and the guide vane unit 2 are made of metal. On the peripheral surface 10a near the bottom surface 10b of the step portion 10 provided in the housing 3, A protrusion 35 protruding inward from the peripheral surface 10a is formed, and an inlay that is fixed by press-fitting the peripheral surface of the bearing ring 14 of the guide vane unit 2 into the protrusion 35 and plastically deforming it. The radial direction fixing means 37 which consists of the fixing | fixed part 36 is comprised. In the spigot fixing part 36, the fit between the housing 3 (step part 10) and the guide vane unit 2 (bearing ring 14) is a tight fit. That is, the guide vane unit 2 is tightly fitted to the stepped portion 10 by tightening. The radial fixing means 37 comprising the inlay fixing part 36 can also serve as an axial fixing means for preventing the guide vane unit 2 from coming out of the step part 10.

  FIG. 1B shows another example of the radial fixing means when the housing 3 and the guide vane unit 2 are made of metal. The outer periphery of the front end of the presser ring 15 of the guide vane unit 2 is shown in FIG. A projecting portion 15 '' having the same diameter as the peripheral surface 10a is formed in a portion of the step portion 10 that is fitted to the peripheral surface 10a, and the guide vane unit 2 is press-fitted into the peripheral surface 10a of the step portion 10. At this time, the outer peripheral surface of the projecting portion 15 ″ and the peripheral surface 10a constitute a radial fixing means 37 including a spigot fixing portion 36 ′ that is fixed by plastic deformation. In the spigot fixing portion 36 ′, the fit between the housing 3 and the guide vane unit 2 (holding ring 15) is a tight fit. That is, the guide vane unit 2 is tightly fitted to the stepped portion 10 by tightening. In the case of FIG. 1 (b), the peripheral surface 10a of the holding ring 15 can pass through the front (left side) portion of the housing 3 with respect to the locking groove 38. A large-diameter opening 44 having a large diameter is provided. At this time, a radial fixing means 37 is formed between the outer periphery of the bearing ring 14 and the protruding portion 35 of the housing 3 as a gap flap 43 ′ by a gap 43. The radial direction fixing means 37 including the inlay fixing portion 36 ′ can also serve as an axial direction fixing means for preventing the guide vane unit 2 from coming out of the stepped portion 10.

  Further, as shown in FIG. 1B, the holding ring 15 and the peripheral surface 10a of the step portion 10 of the housing are fixed by a radial fixing means 37 including a spigot fixing portion 36 ′, and the bearing ring 14 is fixed. It is also possible to fix between the outer periphery and the protruding portion 35 of the housing 3 by the radial direction fixing means 37 including the spigot fixing portion 36 as shown in FIG. However, when both the presser ring 15 and the bearing ring 14 are fixed by the radial fixing means 37 including the spigot fixing portions 36, 36 ′, the pressure input adjustment when the guide vane unit 2 is press-fitted into the stepped portion 10 is adjusted. Therefore, when the presser ring 15 is fixed to the peripheral surface 10a of the stepped portion 10 by the radial fixing means 37 including the spigot fixing portion 36 'as described above, the bearing ring 14 is shown in FIG. It is preferable to fix to the protrusion part 35 of the housing 3 with the radial direction fixing means 37 which consists of clearance gap 43 'as shown in (b).

  On the other hand, when at least one of the housing 3 and the guide vane unit 2 is made of resin, the axial fixing means 37 using the spigot fixing portions 36 and 36 'shown in FIG. 1 may break without plastic deformation. For this reason, the axial fixing means 37 by the inlay fixing portions 36 and 36 ′ cannot be employed.

  For this reason, when at least one of the housing 3 and the guide vane unit 2 is made of resin, as shown in FIG. 2, a protruding portion 35 provided on the peripheral surface 10a near the bottom surface 10b of the step portion 10, and a guide vane A diameter composed of a clearance 43 ′ provided with a slight clearance 43 between the bearing ring 14 and the peripheral surface of the unit 2 so that the clearance 43 is fitted therein, and the rotation prevention means 11 using the split pin or the like. The movement in the radial direction is fixed by the direction fixing means 37. In addition, a clearance gap 43 is provided in which a slight clearance 43 is provided between the protruding portion 15 ′ provided on the holding ring 15 of the guide vane unit 2 and the peripheral surface 10 a of the stepped portion 10 so that the clearance 43 is fitted. The presser ring 15 may be fixed by the radial fixing means 37 by '. In the case where at least one of the housing 3 and the guide vane unit 2 is made of resin, the radial direction fixing means 37 may be configured to fix the gap 43 with an adhesive.

  Next, the axial direction fixing means will be described. As shown in FIGS. 1 to 3, an annular locking groove 38 is formed on the peripheral surface 10 a of the step portion 10 corresponding to the front end surface of the presser ring 15 of the guide vane unit 2 fitted to the step portion 10. In the locking groove 38, the snap ring 39 made of an elastic material (spring material) having the shape shown in FIG. An axial fixing means 40 adapted to be fitted in the stop groove 38 is configured. The axial direction fixing means 40 is formed with an inclined surface 41 inclined rearward from the inner side in the radial direction toward the outer side on the front inner surface of the locking groove 38, and on the front side surface of the retaining ring 39. An inclined surface 42 coinciding with the inclined surface 41 is formed. Then, as shown in FIG. 3 (a), from the state where the outer peripheral edge of the retaining ring 39 is fitted in the retaining groove 38, the retaining ring 39 is expanded in diameter by the elastic force and is engaged as indicated by an arrow X. When entering the groove 38, the retaining ring 39 moves backward as indicated by the arrow Y in FIG. 3B by the action of the inclined surfaces 41, 42 and pushes the guide vane unit 2 into the step portion 10. The guide vane unit 2 is fixed by urging in this manner.

  FIGS. 9 and 10 show another example of the configuration of the guide vane unit 2 to which the present invention is applied. In all the guide vanes 1 provided in the guide vane unit 2, the transmission member 46 provided in the shaft 22 is annular. It is in contact with a receiving portion 47 made of a body. When the receiving plate 47 is pushed by the coil spring 45 and the coil spring 45 becomes free length, as shown in FIG. 10A, all the guide vanes 1 are urged so as to be in the minimum opening posture. A concave groove 48 supports the coil spring 45.

  When the flow rate of the intake air through the unit opening 12 increases due to the rotation of the compressor impeller 5, the guide vane 1 rotates so that the opening degree increases as shown in FIG. 10B, and the shaft 22 accompanying the rotation of the guide vane 1. Due to this rotational force, the transmission member 46 rotates to push the receiving plate 47 and compresses the coil spring 45. Instead of the coil spring 45, a wave washer or the like may be used.

  According to the configuration of FIG. 9, the opening degree of the guide vane 1 can be automatically adjusted according to the flow rate of the intake air, and the intake air can be brought into an appropriate state and guided to the compressor impeller 1 to be compressed. The rotating shaft 29, the arm 30, the connecting pin 31, and the driving device provided outside the housing 3 for rotating the guide vane 1 shown in the figure are unnecessary, simplifying the configuration and saving the space of the compressor. Therefore, the compressor can be easily mounted on a vehicle or the like.

  The operation of the embodiment of the present invention will be described below.

  When the guide vane unit 2 is assembled, as shown in FIG. 6, the bearing ring 14 is arranged so that the facing surface 13a of the bearing ring 14 faces upward, and the annular ring 16 of the bearing ring 14 shown in FIG. 2 and 5, the pressing means 25 and the ring gear 26 are arranged, and the shaft 22 of the guide vane 1 is arranged in the bearing recesses 23 of the inner wall 19 and the outer wall 20. Next, the presser ring 15 is arranged above the bearing ring 14, and the guide vane unit 2 is assembled integrally by the integration means 34 that fits the engaging convex portion 33 b of the pressing ring 15 into the engaging concave portion 33 a. At this time, when the guide vane unit 2 is made of metal, the engaging concave portion 33a and the engaging convex portion 33b are integrated by plastic deformation, and when the guide vane unit 2 is made of resin, The engaging convex portion 33b and the engaging concave portion 33a are integrated using an adhesive. Further, a rotation prevention means 11 such as a split pin is attached to the pin hole 11a on the insertion end face of the bearing ring 14.

  Thus, the guide vane unit 2 assembled in this way is inserted into the step portion 10 of the housing 3, and the rotation prevention means 11 such as a split pin attached to the guide vane unit 2 is attached to the bottom surface 10 b of the step portion 10. The guide vane unit 2 is positioned in the circumferential direction (rotation prevention) by being inserted into the provided pin hole 11b, and the guide vane unit 2 is pushed into the step portion 10 from this state as shown in FIGS. . When the housing 3 and the guide vane unit 2 are made of metal, the guide vane unit 2 is moved in the radial direction by the radial fixing means 37 in which the spigot fixing portions 36 and 36 'shown in FIG. Is securely regulated and fixed to the stepped portion 10. On the other hand, when at least one of the housing 3 and the guide vane unit 2 is made of resin, a gap 43 provided between the protruding portion 35 of the housing 3 and the guide vane unit 2 shown in FIG. The radial movement is fixed by the radial fixing means 37 including the clearance gap 43 ′ and the anti-rotation means 11 using the split pin or the like.

  Next, in a state in which the retaining ring 39 is contracted in the locking groove 38 formed in the peripheral surface 10a of the step portion 10 so as to correspond to the front end surface of the guide vane unit 2 fitted to the step portion 10 of the housing 3. Insert and release. Then, the retaining ring 39 expands due to elastic force and enters the locking groove 38 as shown by an arrow X from the state shown in FIG. 3 (a) to the state shown in FIG. 3 (b). By the action of the inclined surface 41 provided in the stop groove 38 and the inclined surface 42 provided in the retaining ring 39, the retaining ring 39 moves rearward Y (in the insertion direction of the guide vane unit 2) as shown in FIG. Since the guide vane unit 2 is pressed, the movement of the guide vane unit 2 in the axial direction is reliably restricted and fixed to the step portion 10 by the axial fixing means 40 by the retaining ring 39.

  As described above, the guide vane unit 2 has a diameter by the radial direction fixing means 37 by the spigot fixing portions 36, 36 ′ or the radial direction fixing means 37 including the claw 43 ′ and the rotation prevention means 11 by the split pin or the like. Since the guide vane unit 2 is fixed in the axial direction by the axial direction fixing means 40 which is fixed in the direction and further comprises the locking groove 38 having the inclined surfaces 41 and 42 and the retaining ring 39, the guide vane unit 2 is guided with a simple configuration. The vane unit 2 can be easily assembled and fixed to the housing 3.

  When the guide vane unit 2 is securely fixed to the housing 3 in the axial direction by the radial fixing means 37 by the inlay fixing portions 36, 36 'of FIG. The axial fixing means 40 comprising the ring 39 can be omitted. However, in order to securely fix the guide vane unit 2 so as not to come out of the stepped portion 10, it is preferable to provide the axial direction fixing means 40.

  Further, according to the supercharger having the guide vane unit housing assembly structure, the guide vane unit can be stably fixed with a simple configuration, and the reliability of the supercharger can be improved.

  Note that the guide vane unit housing assembly structure and the supercharger of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. It is.

DESCRIPTION OF SYMBOLS 1 Guide vane 2 Guide vane unit 3 Housing 5 Compressor impeller 7 Suction port 10 Step part 13a, 13b Opposing surface 14 Bearing ring 15 Holding ring 22 Shaft 36, 36 'Inner fixing part 37 Radial direction fixing means 38 Locking groove 39 Stop ring 40 Axial fixing means 41, 42 Inclined surface 43 Gap 43 'Gap

Claims (5)

A bearing ring having a housing in which a step portion is formed at a suction port of a compressor impeller, and a guide vane unit that is fitted and installed in the step portion of the housing, the guide vane unit being divided by a facing surface A guide vane unit housing assembly structure in which the shaft of the guide vane is rotatably sandwiched between and supported by the presser ring,
A radial fixing means for restricting the radial movement of the guide vane unit fitted in the stepped portion of the housing; and an axial fixing means for restricting the axial movement of the guide vane unit. A guide vane unit housing assembly structure.   The radial fixing means may be an inlay fixing portion in which the guide vane unit is fitted into the step portion of the housing with a clamp, or a gap fit in which the guide vane unit is fitted into the step portion of the housing through a gap. 2. The guide vane unit housing assembly structure according to claim 1, wherein the guide vane unit is prevented from rotating by a pin. 3.   The axial fixing means is a retaining ring made of an elastic material that fits into an annular retaining groove formed in a step portion of the housing, and the retaining groove and the retaining ring are formed by expanding the diameter of the retaining ring. 3. The guide vane unit housing assembly structure according to claim 1 or 2, further comprising an inclined surface that moves to the guide vane unit side and acts to push the guide vane unit into the stepped portion.   The radial direction fixing means is an inlay fixing portion in which the guide vane unit is fastened to a step portion of the housing and is fitted with a flange, and the radial direction fixing means by the inlay fixing portion also serves as the axial direction fixing means. The housing assembly structure of the guide vane unit according to any one of claims 1 to 3.   A turbocharger comprising the guide vane unit housing assembly structure according to any one of claims 1 to 4.

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