CHARGER

Abstract

A turbocharger has a turbine impeller, a housing configured to house the turbine impeller, a nozzle ring housed in the housing, a plurality of nozzle vanes attached to the nozzle ring, and a positioning unit configured to position the nozzle ring in a circumferential direction relative to the housing.The positioning unit has a positioning pin provided on one of the housing component and the nozzle ring component and extending in an axial direction of the nozzle ring, a first engagement portion provided on the other of the housing component and the nozzle ring component and engaging with the positioning pin, a second elastic member configured to bias the nozzle ring to restrict the nozzle ring in the circumferential direction relative to the housing, and a second engagement portion configured to engage with the second elastic member, wherein the second elastic member and the second engagement portion are provided on at least one of the housing component or the nozzle ring component.

Description

Technical field

[0001] The present invention relates to a turbocharger. Technical background

[0002] For example, patent literature 1 describes a turbocharger. The turbocharger described in patent literature 1 has a turbine wheel fixed to a turbine shaft, a turbine housing that contains the turbine wheel, a bearing housing that axially supports the turbine wheel, and a variable nozzle vane mechanism arranged in a connecting chamber between the turbine housing and the bearing housing. The variable nozzle vane mechanism has an annular first nozzle plate arranged on the bearing housing side, an annular second nozzle plate arranged on the turbine housing side, and a plurality of nozzle vanes arranged between the first and second nozzle plates and supported by them.An elastic body, which pre-tensions the second nozzle plate in a direction towards the bearing housing along the central axis of the second nozzle plate, is arranged between the turbine housing and the second nozzle plate. Citation list of patent literature

[0003] Patent literature 1: Japanese unexamined patent publication no. 2021-76079 Summary of the invention: Technical problem

[0004] In the turbocharger described above, the second nozzle plate is pre-tensioned in an axial direction relative to the bearing housing by the elastic body, but the positioning of a nozzle ring, such as the first nozzle plate and the second nozzle plate, in a circumferential direction relative to the bearing housing is not specifically considered.

[0005] To position the nozzle ring circumferentially, a positioning pin extending in the axial direction of the nozzle ring is used. In this case, to facilitate turbocharger assembly, the nozzle ring and positioning pin must be fitted with a gap. However, if the nozzle ring and positioning pin are fitted with a gap, the nozzle ring will vibrate circumferentially due to machine vibration, and wear of both the nozzle ring and the positioning pin is likely to occur. Normally, the nozzle ring is pressed against the turbine housing or bearing housing and fixed to it by the elastic body, which preloads the nozzle ring axially, but the nozzle ring itself may not be able to withstand the machine vibration.

[0006] It is an objective of the present disclosure to provide a turbocharger capable of suppressing wear of a nozzle ring and a positioning pin. Solution to the problem

[0007] A turbocharger according to one aspect of the present disclosure has a turbine impeller fixed to a shaft, a housing designed to accommodate the turbine impeller and the shaft and to rotatably support the shaft, a nozzle ring housed in the housing and arranged radially outside the turbine impeller, a plurality of nozzle vanes attached to the nozzle ring to be arranged along a circumferential direction of the nozzle ring, a first elastic component designed to pre-tension the nozzle ring in an axial direction relative to the housing, and a positioning unit designed to position the nozzle ring in a circumferential direction relative to the housing.The positioning unit has a positioning pin located on one component of the housing and the nozzle ring, extending in an axial direction along the nozzle ring; a first engagement section located on the other component of the housing and the nozzle ring, engaging with the positioning pin; a second elastic component designed to pre-tension the nozzle ring to restrict its circumferential movement relative to the housing; and a second engagement section designed to engage with the second elastic component. The second elastic component and the second engagement section are located on at least one component of the housing or the nozzle ring.This means that the second elastic component is located on the housing or the nozzle ring, and the second engagement section is also located on the housing or the nozzle ring. For example, both the second elastic component and the second engagement section can be located on the housing, or both can be located on the nozzle ring. Furthermore, the second elastic component can be located on the housing and the second engagement section on the nozzle ring, or the second elastic component can be located on the nozzle ring and the second engagement section on the housing.

[0008] In such a turbocharger, the positioning pin, which extends in the axial direction of the nozzle ring, engages with its first engagement section, thereby positioning the nozzle ring circumferentially relative to the housing. The second elastic component then engages with the second engagement section of the nozzle ring to pre-tension it, thus constraining its circumferential movement relative to the housing. Therefore, even if there is a gap along the circumference between the positioning pin and the nozzle ring, the second elastic component constrains the nozzle ring's circumferential movement relative to the housing. Consequently, since any rattling or clattering of the nozzle ring circumferentially relative to the housing is suppressed, even if an external vibration is applied to the nozzle ring, any oscillation of the nozzle ring in the circumferential direction relative to the housing is also suppressed.Consequently, wear and tear on the nozzle ring and the positioning pin is suppressed.

[0009] The positioning pin can be located on the housing, and the first engagement section can be located on the nozzle ring. In such a design, the nozzle ring can be easily manufactured by performing a process of forming the first and second engagement sections on the nozzle ring in the same step.

[0010] The housing can have an inner circumferential surface facing the nozzle ring in the axial direction, and the second elastic component can be attached to the housing to be positioned side by side with the positioning pin in the circumferential direction of the nozzle ring, pre-tensioning the nozzle ring in a direction that intersects both the axial and radial directions. In such a design, the nozzle ring is pre-tensioned in the direction that intersects the axial and radial directions by the second elastic component, which is positioned side by side in the circumferential direction of the nozzle ring relative to the positioning pin. Therefore, the nozzle ring is reliably constrained in the circumferential direction relative to the housing.

[0011] The housing can have an inner circumferential surface facing the nozzle ring in the axial direction, and the second elastic component can be attached to the inner circumferential surface of the housing and pre-tension the nozzle ring in a direction that intersects both the axial and radial directions. In such a design, the nozzle ring is pre-tensioned in the direction that intersects the axial and radial directions by the second elastic component attached to the inner circumferential surface of the housing. Therefore, the nozzle ring is reliably constrained in the circumferential direction relative to the housing.

[0012] The nozzle ring can have an outer circumferential surface facing the housing in a radial direction. The second engagement section can be a notch provided on the nozzle ring to form an opening in its outer circumferential surface, and this notch has a tapered face. The second elastic component can preload this tapered face radially inward with respect to the nozzle ring. In such a design, when the second elastic component preloads the tapered face of the nozzle ring's notch radially inward with respect to the nozzle ring, the nozzle ring is preloaded in the direction that intersects the axial and radial directions by a composite component of the preload force. Therefore, the nozzle ring is constrained in the circumferential direction relative to the housing by this simple structure.

[0013] The nozzle ring can have an outer circumferential surface facing the housing in the radial direction of the nozzle ring. The second engagement section can be a notch provided on the nozzle ring to form an opening in the outer circumferential surface of the nozzle ring, and it has two inner surfaces facing each other in the circumferential direction of the nozzle ring. The second elastic component can pre-tension one of the two inner surfaces. In such a design, the second elastic component pre-tensions an inner surface of the nozzle ring's notch, so that the nozzle ring is directly pre-tensioned in the direction that intersects the axial and radial directions. Therefore, the nozzle ring is limited in the circumferential direction relative to the housing by this simple structure.

[0014] The nozzle ring can be provided with a common engagement section that forms the first and second engagement sections. The second elastic component can be located adjacent to the positioning pin in the circumferential direction of the nozzle ring at the common engagement section and pre-tension the nozzle ring in a direction that intersects both the axial and radial directions. In such a design, even if the second elastic component is not attached to the housing, the nozzle ring is pre-tensioned by the second elastic component in the direction that intersects the axial and radial directions. Therefore, the nozzle ring is restricted in the circumferential direction relative to the housing, while the housing structure is simplified.

[0015] Furthermore, according to one aspect of the present disclosure, a turbocharger has a turbine impeller fixed to a shaft, a housing designed to accommodate the turbine impeller, a nozzle ring housed in the housing and arranged radially outside the turbine impeller, a plurality of nozzle vanes attached to the nozzle ring, and a positioning unit designed to position the nozzle ring relative to the housing.The positioning unit has a positioning pin provided on at least one component of the housing component or the nozzle ring component and extending in an axial direction of the nozzle ring, a pin engagement section designed to engage with the positioning pin to position the nozzle ring in a circumferential direction relative to the housing, and an elastic body designed to pre-tension the nozzle ring to constrain the nozzle ring in a circumferential direction relative to the housing.

[0016] Furthermore, an engagement section intended for an elastic body, which is provided on at least one component of the housing component or the nozzle ring component and engages with the elastic body, may be provided. Advantageous effects of the invention

[0017] According to the present disclosure, wear of a nozzle ring and a positioning pin can be suppressed. Brief description of the drawings Fig. Figure 1 is a cross-sectional view showing a turbocharger according to a first embodiment of the present disclosure. Fig. Figure 2 is a perspective exploded view of a variable-capacity mechanism. Fig. Figure 3 is a top view of the variable capacity mechanism. Fig. Figure 4 is a top view (including a partial cross-section) showing a positioning unit together with a nozzle ring. Fig. Figure 5 is a perspective view of a positioning pin and a spring component. Fig. Figure 6 is a cross-sectional view of the positioning unit, which is located in Fig. 4 is shown. Fig. Figure 7 is a top view (including a partial cross-section) showing a positioning unit as a comparison example together with the nozzle ring. Fig. Figure 8 is a cross-sectional view of the positioning unit, which is located in Fig. 7 is shown. Fig. Figure 9 is a top view (including a partial cross-section) showing a modification of the positioning unit together with the nozzle ring as a turbocharger according to a second embodiment of the present disclosure. Fig. Figure 10 is a top view (including a partial cross-section) showing a further modification of the positioning unit together with the nozzle ring as a turbocharger according to a third embodiment of the present disclosure. Fig. Figure 11 is a top view (including a partial cross-section) showing a further modification of the positioning unit together with the nozzle ring as a turbocharger according to a fourth embodiment of the present disclosure. Fig. Figure 12 is a cross-sectional view showing a positioning unit as a turbocharger according to a fifth embodiment of the present disclosure. Description of the exemplary implementations

[0018] Exemplary embodiments of the present disclosure are described below with reference to the drawings. It should be noted that in the description of the drawings, the same or equivalent elements are designated with the same reference numerals, and redundant descriptions are omitted.

[0019] Fig. Figure 1 is a cross-sectional view representing a turbocharger according to a first embodiment of the present disclosure. Fig. 1 is a turbocharger. In the present embodiment, 1 is a variable-capacity turbocharger. The turbocharger 1 is applied, for example, to an engine of a vehicle or a ship.

[0020] The turbocharger 1 has a turbine 2, a compressor 3, and a shaft 4 connecting the turbine 2 and the compressor 3. The turbine 2 has a turbine impeller 5 and a turbine housing 6. The compressor 3 has a compressor impeller 7 and a compressor housing 8.

[0021] The turbine impeller 5 is fixed to one end of the shaft 4. The compressor impeller 7 is fixed to the other end of the shaft 4. A bearing housing 10 is arranged between the turbine housing 6 and the compressor housing 8. The bearing housing 10 is fixed to both the turbine housing 6 and the compressor housing 8. The bearing housing 10 contains the shaft 4 and supports the shaft 4 via a bearing 9 in a rotatable manner.

[0022] The turbine housing 6 contains the turbine runner 5. The turbine housing 6 has a screw passage 11 and an outlet 12 connected to the screw passage 11. The screw passage 11 is arranged around the turbine runner 5. Exhaust gas emitted by the machine flows into the turbine housing 6 from an inlet (not shown) and then flows through the screw passage 11 to be directed to the turbine runner 5, causing it to rotate. The exhaust gas then flows out of the turbine housing 6 through the outlet 12.

[0023] The compressor housing 8 contains the compressor impeller 7. The compressor housing 8 has an intake port 13 and a screw passage 14 connected to the intake port 13. The screw passage 14 is arranged around the compressor impeller 7. When the turbine impeller 5 rotates, the compressor impeller 7 rotates via the shaft 4. Ambient air is then drawn into the compressor housing 8 from the intake port 13. The intake air is compressed as it passes through the compressor impeller 7 and the screw passage 14. The compressed air is discharged from a discharge port (not shown) and fed to the machine.

[0024] Furthermore, as also in Fig. As shown in Figure 2, the turbine 2 has a variable-capacity mechanism 20 that adjusts the nozzle opening (capacity). The variable-capacity mechanism 20 has a CC plate (distance control plate) 21, a nozzle ring 22, a CC pin (distance control pin) 23, a plurality of nozzle vanes 24, a drive ring 25, a plurality of nozzle connecting element plates 26, and a drive connecting element plate 27.

[0025] The CC plate 21 has a disc shape. The central axis of the CC plate 21 coincides with an axis of rotation X of the shaft 4. The CC plate 21 is arranged around the axis of rotation X to surround the turbine impeller 5. The CC plate 21 is located radially outside the turbine impeller 5. The radial outside refers to a position farther away from the axis of rotation X in a radial direction than a certain reference (for example, the turbine impeller 5). Furthermore, the radial inside refers to a position closer to the axis of rotation X in the radial direction than the certain reference.

[0026] The CC plate 21 has a main plate surface 21a facing an inner wall surface 6a of the turbine housing 6, and a rear plate surface 21b facing the nozzle ring 22. The rear plate surface 21b is a surface of the CC plate 21 opposite the main plate surface 21a. The CC plate 21 is provided with a plate hole 21h extending from the main plate surface 21a to the rear plate surface 21b. Furthermore, the CC plate 21 is provided with a plurality of (for example, three) pin holes 29. The pin holes 29 are arranged, for example, at equal intervals along the circumferential direction of the CC plate 21.

[0027] The nozzle ring 22 has a disc shape. The central axis of the nozzle ring 22 coincides with the axis of rotation X of the shaft 4. The nozzle ring 22 is positioned closer to the bearing housing 10 than the CC plate 21 in the direction of the axis of rotation X (axial direction). The nozzle ring 22 is located between the CC plate 21 and the bearing housing 10. The nozzle ring 22 is arranged radially outside the turbine impeller 5. The nozzle ring 22 is arranged around the axis of rotation X to surround the turbine impeller 5 or the shaft 4.

[0028] The nozzle ring 22 has a cylindrical ring main body 30, an outer flange section 31 that projects radially outwards from the ring main body 30, and an inner flange section 32 that projects radially inwards from the ring main body 30.

[0029] The ring body 30 has an outer circumferential surface 30c. The ring body 30 is provided with a plurality of nozzle shaft holes 33 and notches 34 and 35. The nozzle shaft holes 33 are, for example, arranged at equal intervals along the circumferential direction of the ring body 30. The notches 34 and 35 will be described in detail later.

[0030] The outer flange section 31 has an outer circumferential surface 31c. The outer flange section 31 is provided with a plurality (here three) pin holes 36. The central axis of the pin hole 36 coincides with the central axis of the pin hole 29 of the CC plate 21.

[0031] The nozzle ring 22 has a main ring surface 22a facing the rear surface 21b of the CC plate 21, and a rear ring surface 2b facing the bearing housing 10. The rear ring surface 22b is a surface of the nozzle ring 22 opposite the main ring surface 22a. The nozzle ring 22 is provided with an annular hole 22h that extends from the main ring surface 22a to the rear ring surface 22b. The rear ring surface 22b has a main body rear surface 30b, an outer flange rear surface 31b, and an inner flange rear surface 32b. Part of the main body rear surface 30b faces the nozzle connecting element plates 26. The outer flange rear surface 31b faces the drive ring 25.

[0032] The CC pins 23 couple the CC plate 21 to the nozzle ring 22. One end section of the CC pin 23 is inserted into the pin hole 29 of the CC plate 21. The other end section of the CC pin 23 is inserted into the pin hole 36 of the nozzle ring 22. The CC pin 23 defines a gap between the CC plate 21 and the nozzle ring 22. The CC pin 23 acts as a spacer, forming a gap in which the nozzle vane 24 is positioned between the CC plate 21 and the nozzle ring 22.

[0033] The multitude of nozzle vanes 24 are arranged between the CC plate 21 and the nozzle ring 22. The nozzle vanes 24 are arranged, for example, at equal intervals along the circumferential direction of the nozzle ring 22. A nozzle shaft 37, extending towards the nozzle ring 22, is fixed to the nozzle vane 24. The nozzle shaft 37 is inserted through the nozzle shaft hole 33 of the nozzle ring 22. A distal end of the nozzle shaft 37 then protrudes from the main body rear surface 30b of the nozzle ring 22. The diameter of the nozzle shaft 37 is slightly smaller than the diameter of the nozzle shaft hole 33. Thus, the nozzle shaft 37 is rotatable relative to the nozzle ring 22. A nozzle connecting element plate 26 is fixed to the distal end of the nozzle shaft 37.

[0034] The drive ring 25 is arranged on the outer flange rear surface 31b of the nozzle ring 22. The drive ring 25 completely surrounds the main ring body 30 of the nozzle ring 22. The drive ring 25 is coaxial with the nozzle ring 22. The drive ring 25 is rotatable relative to the nozzle ring 22 about the axis of rotation X.

[0035] The drive ring 25 has a ring main surface 25a facing the outer flange rear surface 31b of the nozzle ring 22, and a ring rear surface 25b facing the bearing housing 10. The ring rear surface 25b is a surface of the drive ring 25 opposite the ring main surface 25a. A plurality of nozzle connecting element plates 26 are arranged on the ring rear surface 25b. Furthermore, a drive connecting element plate 27 is also arranged on the ring rear surface 25b.

[0036] As in Fig. As shown in Figure 3, the drive ring 25 has a plurality of connecting pieces 38 arranged along its circumference. The connecting pieces 38 comprise a pair of upright sections 38a that sandwich-like surround a distal end of the nozzle connecting element plate 26 and the drive connecting element plate 27. The upright section 38a projects from the rear surface 25b of the ring. It should be noted that Fig. Figure 3 shows a top view of the variable capacity mechanism 20 from the perspective of one side of the intake port 13 of the compressor 3.

[0037] The nozzle connecting plates 26 are arranged, for example, at equal intervals along the circumferential direction of the drive ring 25. The number of nozzle connecting plates 26 is equal to the number of nozzle vanes 24. The nozzle connecting plate 26 has a rod or bar shape.

[0038] A base end section of the nozzle connecting plate 26 is arranged on the main body rear surface 30b of the nozzle ring 22. A nozzle shaft hole 39 is provided in the base end section of the nozzle connecting plate 26. A distal end of the nozzle shaft 37 is inserted into the nozzle shaft hole 39. In this state, the distal end of the nozzle shaft 37 is fixed to the nozzle connecting plate 26, for example by crimping.

[0039] The distal end of the nozzle connecting element plate 26 is fitted into the pair of upright sections 38a of the connecting piece 38. Specifically, the distal end of the nozzle connecting element plate 26 is merely positioned between the pair of upright sections 38a and is not fixed to the upright section 38a. Thus, the nozzle connecting element plate 26 is not fixed to the drive ring 25.

[0040] The drive connecting plate 27 is arranged between two nozzle connecting plates 26, which are arranged circumferentially. The drive connecting plate 27 has the same structure as the nozzle connecting plate 26. The drive connecting plate 27 is coupled to a drive mechanism (not shown).

[0041] In such a variable-capacity mechanism 20, when the drive ring 25 receives the driving force from the drive connecting plate 27, the drive ring 25 rotates about the axis of rotation X. Then, the distal end of the nozzle connecting plate 26 moves along the circumferential direction with the rotation of the drive ring 25. Thus, the nozzle connecting plate 26 rotates about the nozzle shaft 37. As the nozzle connecting plate 26 rotates, the nozzle shaft 37 rotates, causing the nozzle vane 24 to rotate. This changes the distance between the adjacent nozzle vanes 24. That is, the cross-sectional area between the adjacent nozzle vanes 24 changes.

[0042] Furthermore, turbine 2 also has a spring component 40 (see Fig. 1) which pre-tensions the variable-capacity mechanism 20 in the axial direction relative to the turbine housing 6. For example, a disc spring, a coil spring, a ring spring, or the like is used as the spring component 40. The spring component 40 forms a first elastic component that pre-tensions the nozzle ring 22 in the axial direction relative to the turbine housing 6.

[0043] The spring component 40 is arranged in a space between an annular heat shield 41 and the bearing housing 10. The heat shield 41 is arranged radially inside the nozzle ring 22. The heat shield 41 is held in place by the spring component 40 pressing it against the inner flange section 32 of the nozzle ring 22. The spring component 40 is positioned between a rear surface 41b of the heat shield 41 and the inner wall surface 10a of the bearing housing 10.

[0044] The variable-capacity mechanism 20 is positioned and held by a retaining section 50 of the bearing housing 10. The retaining section 50 has a retaining surface 50a facing the annular rear surface 22b of the nozzle ring 22 and the annular rear surface 25b of the drive ring 25. The retaining surface 50a is part of the inner wall surface 10a of the bearing housing 10. The retaining surface 50a is an example of an inner circumferential surface of the bearing housing 10 and has a section facing the nozzle ring 22 in the axial direction and a section facing the nozzle ring 22 in the radial direction.

[0045] As in Fig. As shown in Figure 4, the retaining section 50 is provided with a positioning pin 51 and a spring component 52. The positioning pin 51 and the spring component 52 form a positioning unit 53 (for example, a positioning assembly) that positions the nozzle ring 22 in the circumferential direction relative to the bearing housing 10 in conjunction with the notches 34 and 35 provided on the nozzle ring 22. The positioning unit 53 comprises, for example, the positioning pin 51, the spring component 52, and the notches 34 and 35. It should be noted that Fig. Figure 4 shows a top view of the nozzle ring 22 and the positioning unit 53 from the side of the intake port 13 of the compressor 3.

[0046] The positioning pin 51 is arranged in a position that overlaps the notch 34 in the retaining section 50. The spring component 52 is arranged in a position that overlaps the notch 35 in the retaining section 50. That is, the spring component 52 is attached to the retaining section 50 to be positioned side by side in the circumferential direction of the nozzle ring 22 relative to the positioning pin 51. The positioning pin 51 extends axially towards the nozzle ring 22. As shown in Fig. As shown in Figure 5(a), the positioning pin 51 has a column-like shape. It should be noted that the shape of the positioning pin 51 is not specifically limited to a column shape and can be a prismatic shape or the like.

[0047] The spring component 52 forms a second elastic component that pre-tensions the nozzle ring 22 to constrain its circumferential movement relative to the bearing housing 10. The spring component 52 is an example of an elastic body. The spring component 52 pre-tensions the nozzle ring 22 in a direction that intersects the axial and radial directions. This intersecting direction of the nozzle ring 22 is either a circumferential or tangential direction. A tangential direction of the nozzle ring 22 is a direction perpendicular to both the axial and radial directions and is essentially a circumferential direction.

[0048] As in Fig. As shown in Figure 5(b), the spring component 52 has a substantially cylindrical base section 54 and a preload section 55 integrated with the base section 54. The base section 54 is provided with a slot 56 extending in the axial direction. The preload section 55 extends in a J-shape from one end opposite the slot 56, with one end extending in the axial direction of the base section 54 towards the slot 56. Both the base section 54 and the preload section 55 are elastically deformable. The spring component 52 is formed, for example, by pressing a thin metal plate into an inverted T shape and then bending it.

[0049] As in Fig. As shown in Figure 6, the retaining section 50 of the bearing housing 10 is provided with mounting holes 57 and 58, which have a circular cross-section. The mounting holes 57 and 58 are designed to form an opening in a section of the retaining surface 50a that faces the nozzle ring 22. Mounting hole 57 has a circular base 57a and a circumferential surface 57b. Mounting hole 58 has a circular base 58a and a circumferential surface 58b. It should be noted that Fig. 6 represents a cross-section along the circumferential direction of the nozzle ring 22.

[0050] Part of the positioning pin 51 is inserted into the mounting hole 57. Part of the base section 54 of the spring component 52 is inserted into the mounting hole 58. At this time, because the slot 56 is provided on the base section 54, the base section 54 can be inserted into the mounting hole 58 in a state where the shape or diameter of the base section 54 is aligned with the diameter of the mounting hole 58. The positioning pin 51 is fixed to the retaining section 50 in a state where it is inserted into the mounting hole 57. The spring component 52 is fixed to the retaining section 50 in a state where it is inserted into the mounting hole 58.

[0051] The notches 34 and 35 are provided on the main ring body 30 of the nozzle ring 22. The notches 34 and 35 are designed to form an opening in the outer circumferential surface 30c of the main ring body 30. In a top view, the notches 34 and 35 have a U-shape. Notch 34 has two inner surfaces 34a facing each other in the circumferential direction of the nozzle ring 22, and a curved inner bottom surface 34b connecting the inner surfaces 34a. Notch 35 has two inner surfaces 35a facing each other in the circumferential direction of the nozzle ring 22, and a curved inner bottom surface 35b connecting the inner surfaces 35a. Notch 34 forms a first engagement section that engages with the positioning pin 51. The engagement between the positioning pin 51 and the notch 34 means that a relative movement between the positioning pin and the notch is limited by the fact that they are in contact with each other.Notch 34 is an example of a pin engagement section. Notch 35 forms a second engagement section that engages with the spring component 52. Notch 35 is an example of an engagement section intended for an elastic body that engages with the spring component 52.

[0052] When the variable capacity mechanism 20 is mounted on the holding section 50 of the bearing housing 10, the nozzle ring 22 is positioned in the circumferential direction relative to the bearing housing 10 by the positioning unit 53.

[0053] Specifically, as in Fig. 4 and Fig. As shown in Figure 6, a distal end of the preload section 55 of the spring component 52 abuts an inner surface 35a of the notch 35. The distal end of the preload section 55 then presses against one of the inner surfaces 35a due to the preload force of the preload section 55 (see arrow P in the drawing). The nozzle ring 52 then moves slightly circumferentially, and the positioning pin 51 comes into contact with an inner surface 34a of the notch 34. Thus, the movement of the nozzle ring 22 in the circumferential direction relative to the bearing housing 10 is limited.

[0054] In the embodiment described in Fig. Figure 6 shows an example in which the positioning pin 51 and the spring component 52 are provided on the bearing housing 10 and the notches 34 and 35 are provided on the nozzle ring 22. However, in the embodiment shown in Figure 6, the following can be considered: Fig. As shown in Figure 6, the positioning pin 51 and the notch 35 are provided on the bearing housing 10, and the notch 34 and the spring component 52 can be provided on the nozzle ring 22.

[0055] Fig. Figure 7 is a top view showing the positioning unit 100 as a comparison example together with the nozzle ring 22. Fig. In the positioning unit 100 of the present comparative example, two positioning pins 51 are attached to the holding section 50 of the bearing housing 10 and two notches 34 are provided on the nozzle ring 22.

[0056] However, in such a positioning unit 100, if an external vibration equal to or greater than the frictional holding force by the spring component 40 is applied by the machine to the variable-capacity mechanism 20, it is difficult for the nozzle ring 22 to withstand the external vibration. That is, as in Fig. As shown in Figure 8, a gap S exists along the circumferential direction between the positioning pin 51 and the nozzle ring 22, considering the assembly of the turbocharger 1. Thus, when an external vibration is applied to the variable-capacity mechanism 20, the nozzle ring 22 vibrates in the circumferential direction, causing a rattling of the nozzle ring 22 relative to the bearing housing 10 and resulting in wear of the nozzle ring 22 and the positioning pin 51. It should be noted that Fig. 8 represents a cross-section along the circumferential direction of the nozzle ring 22.

[0057] If the nozzle ring 22 and the positioning pin 51 are worn due to vibration in the circumferential direction of the nozzle ring 22, the positional relationship of the linkage system for controlling the opening of the nozzle vane 24 is displaced. Thus, if the nozzle vanes 24 are excessively open, they may come into contact with the turbine impeller 5, causing damage, or they may not be able to be held at a suitable opening. As a consequence, the service life of the variable-capacity mechanism 20 is reduced, machine output or performance is decreased, and so on.

[0058] Accordingly, in the present embodiment, the positioning pin 51, which extends in the axial direction of the nozzle ring 22, engages with the notch 34 of the nozzle ring 22, thereby positioning the nozzle ring 22 in the circumferential direction relative to the bearing housing 10. Furthermore, the spring component 52 engages with the notch 35 of the nozzle ring 22 to preload the nozzle ring 22, thus restricting its circumferential movement relative to the bearing housing 10. The engagement between the spring component 52 and the notch 35 means that relative movement between the spring component and the notch is restricted by their contact. Therefore, even if the gap S exists along the circumferential direction between the positioning pin 51 and the nozzle ring 22, the nozzle ring 22 is limited in the circumferential direction relative to the bearing housing 10 by the spring component 52.As a consequence, since rattling of the nozzle ring 22 in the circumferential direction relative to the bearing housing 10 is suppressed, even when an external vibration is applied to the nozzle ring 22, oscillation of the nozzle ring 22 in the circumferential direction relative to the bearing housing 10 is suppressed. Consequently, wear of the nozzle ring 22 and the positioning pin 51 is suppressed. As a result, the service life of the variable-capacity mechanism 20 is increased, and the overall usability of the turbocharger 1 is improved.

[0059] Furthermore, in the present embodiment, the positioning pin 51 is provided on the bearing housing 10, and the notch 34 is provided on the nozzle ring 22. Thus, the nozzle ring 22 can be easily manufactured in the same process by carrying out the process of forming the notches 34 and 35 in the nozzle ring 22.

[0060] Furthermore, in the present embodiment, the nozzle ring 22 is pre-tensioned in the direction that intersects the axial and radial directions by the pre-tensioning component 52, which is arranged side by side in the circumferential direction of the nozzle ring 22 relative to the positioning pin 51. Therefore, the nozzle ring 22 is reliably constrained in the circumferential direction relative to the bearing housing 10.

[0061] It should be noted that in the present embodiment, the spring component 52, which has the base section 54 and the preload section 55, is used, but the second elastic component, which preloads the nozzle ring to restrict the nozzle ring 22 in the circumferential direction relative to the bearing housing 10, is not specifically limited to this, and various modifications can be made. For example, the second elastic component can be a spring component or the like, obtained by simply winding a thin metal plate.

[0062] Furthermore, in the present embodiment, the positioning pin 51, which is provided on the bearing housing 10, engages with the notch 34 of the nozzle ring 22, but the first engagement section with the positioning pin 51 is not specifically limited to the notch 34. The first engagement section can, for example, be an opening (a hole) extending from the main ring surface 22a of the nozzle ring 22 to the rear ring surface 22b, or it can be a recess (a hollow) provided on the rear ring surface 22b of the nozzle ring 22. The second engagement section, which engages with the spring component 52 attached to the bearing housing 10, is not specifically limited to the notch 35 and can be a hole or a hollow.

[0063] Fig. Figure 9 is a top view (including a partial cross-section) showing a modification of the positioning unit together with the nozzle ring as a turbocharger according to a second embodiment of the present disclosure, and is a view corresponding to Fig. 4.

[0064] In Fig. In the present embodiment, the turbocharger 1A has a positioning unit 53A instead of the positioning unit 53 of the first embodiment. The positioning unit 53A has the positioning pin 51, which is attached to the bearing housing 10, and a V-shaped spring component 61, which is attached to the turbine housing 6.

[0065] The spring component 61 is attached to an inner wall section 60 of the turbine housing 6. The inner wall section 60 has an inner circumferential surface 60a that faces the nozzle ring 22 in the radial direction. Specifically, the inner circumferential surface 60a faces the outer circumferential surface 31c of the outer flange section 31 of the nozzle ring 22. The inner wall section 60 is provided with a fixing recess 62. The fixing recess 62 is designed to form an opening in the inner circumferential surface 60a. Both ends of the spring component 61 are fixed to corners of the fixing recess 62. The spring component 61 is attached to the inner circumferential surface 60a of the turbine housing 6 and forms a second elastic component that preloads the nozzle ring 22 in the direction that intersects the axial and radial directions. The spring component 61 is an example of an elastic body.

[0066] Furthermore, the positioning unit 53A has the notch 34, which is provided on the nozzle ring 22, and the notch 63, which has a V-shape in a top view. The notch 33 is provided on the outer flange section 31 of the nozzle ring 22. The notch 63 is provided to form an opening in the outer circumferential surface 31c of the outer flange section 31. The notch 63 is located in a position that is circumferentially separated from the notch 34 in the nozzle ring 22. The notch 63 has two tapered surfaces 63a. The tapered surface 63a is a surface that obliquely intersects the radial direction of the nozzle ring 22. The notch 63 forms a second engagement section that engages with the spring component 61. The notch 63 is an example of an engagement section intended for an elastic body, which engages with the spring component 61.

[0067] A distal end (central section) of the spring component 61 is in contact with a tapered surface 63a of the notch 63. The spring component 61 forces a tapered surface 63a of the notch 63 radially inward with respect to the nozzle ring 22 (see arrow A in the drawing). At this time, the nozzle ring 22 is also forced in the tangential direction by a combined component of preload forces of the spring component 61 (see arrow B in the drawing).

[0068] In the present embodiment, as described above, the nozzle ring 22 is pre-tensioned in the direction intersecting the axial and radial directions by the pre-tensioning element 61, which is attached to the inner circumferential surface 60a of the turbine housing 6. Therefore, the nozzle ring 22 is reliably constrained in the circumferential direction relative to the bearing housing 10.

[0069] Furthermore, in the present embodiment, when the spring component 61 preloads the tapered surface 63a of the notch 63 of the nozzle ring 22 radially inwards with respect to the nozzle ring 22, the nozzle ring 22 is preloaded in the direction that intersects the axial and radial directions by the combined component of the preload force. Therefore, with a simple design, the nozzle ring 22 is restricted in the circumferential direction relative to the bearing housing 10.

[0070] It should be noted that in the present embodiment the V-shaped spring component 61 is used, but the second elastic component, which biases the tapered surface 63a of the notch 63 of the nozzle ring 22 radially inwards with respect to the nozzle ring 22, is not particularly limited to this, and various modifications can be made. For example, the second elastic component can be a normal coil spring or the like.

[0071] Furthermore, in the present embodiment, the notch 63, which has a V-shape in a top view and has two tapered surfaces 63a, is provided on the nozzle ring 22, but the embodiment is not particularly limited to this, and a notch having a tapered surface can be provided on the nozzle ring 22.

[0072] Furthermore, in the present embodiment, the spring component 61 pre-tensions the tapered surface 63a of the notch 63 radially inwards with respect to the nozzle ring 22 in order to pre-tension the nozzle ring 22 in the direction that intersects the axial direction and the radial direction, but the embodiment is not particularly limited to this form, and a design in which the tapered surface 63a of the notch 63 is directly pre-tensioned by the second elastic component in the direction that intersects the axial direction and the radial direction of the nozzle ring 22 can be used.

[0073] Furthermore, in the present embodiment, the spring component 61 is attached to the inner circumferential surface 60a of the turbine housing 6, but the embodiment is not particularly limited to this, and the second elastic component, such as the spring component 61, can be attached to the inner circumferential surface of the bearing housing 10 depending on the design of the turbocharger 1A.

[0074] Fig. Figure 10 is a top view (including a partial cross-section) representing a further modification of the positioning unit as a turbocharger according to a third embodiment of the present disclosure, and is a view corresponding to Fig. 4.

[0075] In Fig. In the present embodiment, a turbocharger 1B has a positioning unit 53B instead of the positioning unit 53 of the first embodiment. The positioning unit 53B has the positioning pin 51, which is attached to the bearing housing 10, and the spring component 52, which is attached to the turbine housing 6.

[0076] The spring component 52 is attached to the inner wall section 60 of the turbine housing 6. The inner wall section 60 has an inner circumferential surface 60a, which faces the nozzle ring 22 in the radial direction. The inner wall section 60 is provided with a mounting hole 65, which has a circular cross-section. The mounting hole 65 is designed to form an opening in the inner circumferential surface 60a. The mounting hole 65 has a circular base surface 65a and a circumferential surface 65b. The base section 54 of the spring component 52 is fixed to the inner wall section 60 in a state in which it is inserted into the mounting hole 65. The spring component 52 is attached to the inner circumferential surface 60a of the turbine housing 6 and forms a second elastic component that preloads the nozzle ring 22 in the direction that intersects the axial and radial directions. The spring component 52 is an example of an elastic body.

[0077] Furthermore, the positioning unit 53B has the notch 34, which is provided on the nozzle ring 22, and the notch 66, which has a rectangular shape in a top view. The notch 66 is provided on the outer flange section 31 of the nozzle ring 22. The notch 66 is designed to form an opening on the outer circumferential surface 31c of the outer flange section 31. The outer circumferential surface 31c of the outer flange section 31 faces the inner circumferential surface 60a of the inner wall section 60. The notch 66 is located in a position that is circumferentially separated from the notch 34 in the nozzle ring 22.

[0078] The notch 66 has two inner surfaces 66a facing each other in the circumferential direction of the nozzle ring 22, and a flat inner base surface 66b connecting the inner surfaces 66a. The two inner surfaces 66a are designed, for example, to be parallel to each other. The notch 66 forms a second engagement section that engages with the spring component 52. The notch 66 is an example of an engagement section intended for an elastic body that engages with the spring component 52.

[0079] A distal end of the preload section 55 of the spring component 52 is in contact with an inner surface 66a of the notch 66. The spring component 52 preloads one inner surface 66a of the notch 66 in the direction that intersects the axial and radial directions of the nozzle ring 22 (see arrow Q in the drawing). The spring component 52 does not preload the other inner surface 66a of the notch 66 in the direction that intersects the axial and radial directions of the nozzle ring 22.

[0080] In the present embodiment, as described above, the spring component 52 pre-tensions one inner surface 66a of the notch 66 of the nozzle ring 22, so that the nozzle ring 22 is directly pre-tensioned in the direction that intersects the axial and radial directions. Therefore, with a simple design, the nozzle ring 22 is restricted in the circumferential direction relative to the bearing housing 10.

[0081] It should be noted that in the present embodiment the J-shaped spring component 52 is used, but the second elastic component, which only preloads one inner surface 66a of the notch 66 of the nozzle ring 22, is not particularly limited to this, and various modifications can be made.

[0082] Furthermore, in the present embodiment, the notch 66, which has a rectangular shape in a top view, is provided on the nozzle ring 22, but the shape of the notch is not particularly limited as long as the notch has two inner surfaces facing each other in the circumferential direction of the nozzle ring 22, and can be a U-shape in a top view, in the same way as the notch 34, or can be a trapezoidal shape or the like in a top view.

[0083] Furthermore, in the present embodiment, depending on the design of the turbocharger 1B, the second elastic component, such as the spring component 52, can also be attached to the inner circumferential surface of the bearing housing 10 instead of to the turbine housing 6.

[0084] Fig. Figure 11 is a top view showing a further modification of the positioning unit as a turbocharger according to a fourth embodiment of the present disclosure, and is a view corresponding to Fig. 4.

[0085] In Fig. In the present embodiment, a turbocharger 1C has a positioning unit 53C instead of the positioning unit 53 of the first embodiment. The positioning unit 53C has the positioning pin 51, which is attached to the bearing housing 10, and a V-shaped spring element 71, which is provided on the nozzle ring 22. The spring element 71 forms a second elastic component that biases the nozzle ring 22 in the direction that intersects the axial and radial directions. The spring element 71 is an example of an elastic body.

[0086] Furthermore, the positioning unit 53C has a notch 72 provided on the nozzle ring 22, which has a substantially rectangular shape in a top view. The notch 72 is provided on the main ring body 30 to open on the outer circumferential surface 30c of the main ring body 30 of the nozzle ring 22. The notch 72 has two inner surfaces 72a facing each other in the circumferential direction of the nozzle ring 22, and a substantially flat inner bottom surface 72b connecting the inner surfaces 72a. The notch 72 forms a first engagement section that engages with the positioning pin 51 and a second engagement section that engages with the spring component 71. That is, the notch 72 is a common engagement section that forms both the first and second engagement sections. The notch 72 is an example of an engagement section intended for an elastic body, which engages with the spring component 71.

[0087] The spring component 71 is arranged in the notch 72 together with the positioning pin 51. The spring component 71 is positioned in the notch 72 to be adjacent to the positioning pin 51 in the circumferential direction. One end of the spring component 71 is in contact with the positioning pin 51. The other end of the spring component 71 is in contact with an inner surface 72a of the notch 72. The spring component 71 pre-tensions the nozzle ring 22 in the direction that intersects the axial and radial directions by pre-tensioning an inner surface 72a of the notch 72 (see arrow R in the drawing).

[0088] In the present embodiment, as described above, the spring element 71 is arranged in the notch 72 to be adjacent to the positioning pin 51 in the circumferential direction of the nozzle ring 22. This preloads the nozzle ring 22 in the direction intersecting the axial and radial directions, even if the spring element 71 is not attached to the bearing housing 10 and the turbine housing 6. Therefore, the nozzle ring 22 is restricted in the circumferential direction relative to the bearing housing 10, while the structure of the bearing housing 10 or the turbine housing 6 is simplified.

[0089] It should be noted that in the present embodiment the V-shaped spring component 71 is used, but the second elastic component, which preloads one inner surface 72a of the notch 72 of the nozzle ring 22, is not particularly limited to this, and various modifications can be made.

[0090] Furthermore, in the present embodiment, the notch 72 is provided on the nozzle ring 22, but the common engagement section, which is to be brought into engagement with the positioning pin 51 and the spring component 71, is not specifically limited to the notch 72, and can be a hole that passes from the main ring surface 22a of the nozzle ring 22 to the rear ring surface 22b, or can be a hole (a recess) that opens in the rear ring surface 22b of the nozzle ring 22.

[0091] Although several embodiments of the present disclosure have been described above, the present disclosure is not limited to the aforementioned embodiments. For example, in the preceding embodiments, the notch that engages with the second elastic component is provided as the second engagement section in the nozzle ring 22, but the present disclosure is not specifically limited to such a shape. For example, a projection that is to engage with the second elastic component may be provided on the nozzle ring 22 as a second engagement section, or the outer circumferential surface 30c or the outer circumferential surface 31c of the nozzle ring 22 may be a second engagement section that is to engage with the second elastic component.

[0092] Furthermore, in the foregoing embodiments, the nozzle ring 22 is pre-tensioned in the axial direction relative to the turbine housing 6 by the spring component 40, but the present disclosure is not particularly limited to this, and the nozzle ring 22 can be pre-tensioned in the axial direction relative to the bearing housing 10 by any elastic body, depending on the design of the turbocharger.

[0093] Furthermore, in the preceding embodiments, only one positioning pin 51 is provided on the bearing housing 10, but the number of positioning pins 51 can be multiple. Additionally, the number of the second elastic components can be multiple.

[0094] Furthermore, in the preceding embodiments, the positioning pin 51 is provided on the bearing housing 10, and the first engagement section that engages with the positioning pin 51 is provided on the nozzle ring 22, but the present disclosure is not specifically limited to such a form. The positioning pin 51 can be provided on the nozzle ring 22, and the first engagement section can be provided on the bearing housing 10. In this case, the first engagement section is, for example, a hole provided on the retaining section 50 of the bearing housing 10. It can be arranged in a

[0095] Fig. Figure 12 is a cross-sectional view representing a positioning unit of a turbocharger according to a fifth embodiment of the present disclosure and is a view corresponding to Fig. 6.

[0096] In Fig. In the present embodiment, the turbocharger has a positioning unit 53D instead of the positioning unit 53 of the first embodiment. The positioning unit 53D has a positioning pin 51D and a spring component 52D. The positioning pin 51D has essentially the same structure as the positioning pin 51, and the spring component 52D has essentially the same structure as the spring component 52. These identical components are provided with the same reference numerals as the positioning pin 51 or the spring component 52.

[0097] The nozzle ring 22 is provided with mounting holes 57D and 58D. Part of the positioning pin 51D is inserted into mounting hole 57D. Part of the base section 54 of the spring component 52D is inserted into mounting hole 58D. The positioning pin 51D is fixed to the nozzle ring 22 in a state in which it is inserted into mounting hole 57D. The spring component 52D is fixed to the nozzle ring 22 in a state in which it is inserted into mounting hole 58D.

[0098] Notches 34D and 35D are provided on the bearing housing 10. Notch 34D forms a first engagement section that engages with the positioning pin 51D. Notch 34D is an example of a pin engagement section. Notch 35D forms a second engagement section that engages with the spring component 52. The spring component 52 is an example of an elastic body, and notch 35D is an example of an engagement section intended for an elastic body that engages with the spring component 52. Notches 34D and 35D have essentially the same structure as notches 34 and 35, and these structures are designated with the same reference numerals as notches 34 and 35.

[0099] The positioning pin 51D and the spring component 52D form a positioning unit 53D (for example, a positioning assembly) which positions the nozzle ring 22 in the circumferential direction relative to the bearing housing 10 in conjunction with the notches 34D and 35D provided on the bearing housing 10.

[0100] The spring component 52D is attached to the nozzle ring 22 so that it is positioned side by side in the circumferential direction of the nozzle ring 22 relative to the positioning pin 51D. The positioning pin 51D extends axially towards the nozzle ring 22.

[0101] The spring element 52D forms a second elastic component that preloads the nozzle ring 22 to restrict its circumferential movement relative to the bearing housing 10. The spring element 52D preloads the nozzle ring 22 in the direction intersecting the axial and radial directions as a consequence of the preload section 55 engaging with and preloading the bearing housing 10. The direction intersecting the axial and radial directions of the nozzle ring 22 is either a circumferential or tangential direction of the nozzle ring 22. The tangential direction of the nozzle ring 22 is a direction perpendicular to both the axial and radial directions of the nozzle ring 22 and is essentially a circumferential direction of the nozzle ring 22.

[0102] In the embodiment described in Fig. Figure 12 shows an example in which the positioning pin 51D and the spring component 52D are provided on the nozzle ring 22, and the notches 34D and 35D are provided on the bearing housing 10. However, in the embodiment shown in Fig. Figure 12 shows an example in which the positioning pin 51D and the notch 35D are provided on the nozzle ring 22 and the notch 34D and the spring component 52D are provided on the bearing housing 10. REFERENCE MARK LIST 1, 1A, 1B, 1C Turbocharger 4 wave 5 Turbine wheel 6 Turbine housings (casings) 10 bearing housings (housings) 22 nozzle ring 24 nozzle blades 30c outer perimeter area 31c Outer circumference 34, 34D notch (first engagement section and pin engagement section) 35, 35D notch (second engagement section and engagement section intended for an elastic body) 40 Spring component (first elastic component) 51, 51D Positioning pen 52, 52D Spring component (second elastic component and elastic body) 53, 53A, 53B, 53C, 53D positioning unit 60a Inner perimeter area 61 Spring component (second elastic component and elastic body) 63 Notch (second engagement section and engagement section intended for an elastic body) 63a rejuvenated area 66 Notch (second engagement section and engagement section intended for an elastic body) 66a Interior surface 71 Spring component (second elastic component and elastic body) 72 Notch (first engagement section, second engagement section, common engagement section, pin engagement section, engagement section intended for an elastic body) QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2021-76079

[0003]

Claims

[1] Turbocharger with: a turbine impeller that is fixed to a shaft; a housing designed to accommodate the turbine impeller and shaft and to support the shaft in a rotatable manner; a nozzle ring which is housed in the casing and is arranged radially outside the turbine impeller; a plurality of nozzle vanes attached to the nozzle ring to be arranged along a circumferential direction of the nozzle ring; a first elastic component designed to pre-tension the nozzle ring in an axial direction relative to the housing; and a positioning unit designed to position the nozzle ring in a circumferential direction relative to the housing, wherein The positioning unit has the following features: a positioning pin which is provided on a component of the housing component and the nozzle ring component and extends in an axial direction of the nozzle ring; a first engagement section, which is provided on the other component by the housing component and the nozzle ring component and engages with the positioning pin; a second elastic component designed to pre-tension the nozzle ring in order to restrict the nozzle ring in the circumferential direction relative to the housing; and a second engagement section designed to engage with the second elastic component, and the second elastic component and the second engagement section are provided on at least one component of the housing component or the nozzle ring component. [2] Turbocharger according to claim 1, wherein the positioning pin is provided on the housing, and the first intervention section is provided on the nozzle ring. [3] Turbocharger according to claim 2, wherein the second elastic component is attached to the housing to be arranged side by side with the positioning pin in the circumferential direction of the nozzle ring and preloads the nozzle ring in a direction which intersects an axial direction and a radial direction. [4] Turbocharger according to claim 2, wherein the housing has an inner circumferential surface that faces the nozzle ring in the axial direction, and the second elastic component is attached to the inner circumferential surface of the housing and pre-tensions the nozzle ring in a direction that intersects an axial direction and a radial direction. [5] Turbocharger according to claim 4, wherein the nozzle ring has an outer circumferential surface that faces the housing in a radial direction of the nozzle ring, the second engagement section is a notch provided on the nozzle ring to form an opening in the outer circumferential surface of the nozzle ring, and which has a tapered surface, and The second elastic component pre-tensions the tapered surface radially inwards with respect to the nozzle ring. [6] Turbocharger according to claim 4, wherein the nozzle ring has an outer circumferential surface that faces the housing in a radial direction of the nozzle ring, the second engagement section is a notch provided on the nozzle ring to form an opening in the outer circumferential surface of the nozzle ring, and which has two inner surfaces facing each other in the circumferential direction of the nozzle ring, and The second elastic component prestresses one of the two inner surfaces. [7] Turbocharger according to claim 2, wherein the nozzle ring is provided with a common engagement section that forms the first attack section and the second engagement section, and the second elastic component is arranged adjacent to the positioning pin in the circumferential direction of the nozzle ring at the common engagement section and prestresses the nozzle ring in a direction that intersects an axial direction and a radial direction. [8] Turbocharger with: a turbine impeller that is fixed to a shaft; a housing designed to accommodate the turbine impeller; a nozzle ring which is housed in the casing and is arranged radially outside the turbine impeller; a multitude of nozzle vanes attached to the nozzle ring; and a positioning unit designed to position the nozzle ring relative to the housing, wherein The positioning unit has the following features: a positioning pin which is provided on at least one component of the housing component or the nozzle ring component and extends in an axial direction of the nozzle ring; a pin engagement section designed to engage with the positioning pin to position the nozzle ring in a circumferential direction relative to the housing; and an elastic body designed to pre-tension the nozzle ring in order to restrict the nozzle ring in the circumferential direction relative to the housing. [9] Turbocharger according to claim 8, further comprising an engagement section intended for an elastic body, which is provided on at least one component of the housing component or the nozzle ring component and engages with the elastic body.

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