JP2021134698A - Compressor device and turbocharger - Google Patents

Abstract

To propose simple and low-cost means capable of solving a problem of a screw fastening system, as coupling means of a compressor wheel and a shaft.SOLUTION: A compressor device comprises: a compressor wheel including a hub part, and a plurality of compressor blades provided on the outer peripheral surface of the hub part; and a shaft inserted into a bottomed insertion hole having an opening on the back surface of the compressor wheel. At least a part of an insertion portion of the shaft inserted into the insertion hole is adhered to a wall surface forming the insertion hole with an adhesive.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a compressor device and a turbocharger equipped with the compressor device.

The compressor device incorporated in the turbocharger has a so-called bore-through structure compressor device in which a through hole is formed in the central axis of the compressor wheel and a shaft is inserted into the through hole, and an opening is provided in the back surface of the compressor wheel. There is a compressor device having a so-called boreless structure in which an insertion hole at the bottom is formed and a shaft is inserted into the insertion hole. A so-called boreless structure may be adopted in a compressor incorporated in a relatively large turbocharger attached to a commercial vehicle or an industrial engine. It has been confirmed that the boreless structure has advantages such as reduction of stress concentration generated in the area around the insertion hole. Patent Document 1 discloses a turbocharger that employs a boreless structure for a compressor wheel. The joint between the boss and the shaft of this compressor wheel is threaded, and the two are screwed together.

International Publication No. 2019/097611

In the turbocharger disclosed in Patent Document 1, since the boss portion of the compressor wheel and the shaft are fastened with screws, it is necessary to form a grip portion for fixing the torque wrench at the tip end portion of the compressor wheel at the time of fastening. be. There is a problem that the formation of this grip portion disturbs the flow of air supply and causes pressure loss. Further, in the case of screw fastening, stress concentration may occur on the screw thread, which may lead to fatigue failure. Further, in screw fastening, it is necessary to secure about 5 meshing threads and a centering portion is also required, so that the axial length of the insertion hole tends to be long. On the other hand, in the compressor wheel, since the centrifugal stress generated on the wall surface that forms the insertion hole at the axial position where the hub portion has the maximum outer diameter is the maximum, it is necessary to avoid forming the insertion hole at this axial position. be.

The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to propose a simple and low-cost means capable of solving the above-mentioned problems as a means for connecting a compressor wheel and a shaft.

In order to achieve the above object, the compressor device according to the present disclosure has a compressor wheel including a hub portion, a plurality of compressor blades provided on an outer peripheral surface of the hub portion, and an opening on the back surface of the compressor wheel. A compressor device including a shaft inserted into a bottom insertion hole, wherein at least a part of the shaft inserted into the insertion hole is adhered to a wall surface forming the insertion hole with an adhesive. Has been done.

Further, the turbocharger according to the present disclosure includes the above-mentioned compressor device and a turbine device including a turbine wheel fixed on the shaft of the compressor device on the side opposite to the compressor wheel.

According to the compressor device and turbocharger according to the present disclosure, since screwing is not required, stress concentration does not occur, the risk of damage such as fatigue fracture can be reduced, and the manufacturing man-hours and costs can be reduced. Further, since the grip portion at the tip of the compressor wheel required for screw fastening is not required, the pressure loss of the gas flow sucked by the compressor wheel can be reduced.

It is a schematic overall view of the turbocharger which concerns on one Embodiment. It is a front view sectional view of the compressor apparatus which concerns on one Embodiment. It is a partial cutting side view of the compressor apparatus which concerns on one Embodiment. It is a front view sectional view of the compressor apparatus which concerns on one Embodiment. It is a cross-sectional view along the line AA in FIG. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is sectional drawing of the compressor apparatus which concerns on one Embodiment. It is a front view sectional view of the compressor apparatus which concerns on one Embodiment.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in these embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, and are merely explanatory examples. It's just that.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or chamfering within a range in which the same effect can be obtained. The shape including the part and the like shall also be represented.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions that exclude the existence of other components.

(Turbocharger configuration)
FIG. 1 is a schematic overall view of a turbocharger according to an embodiment. The turbocharger 10 includes a compressor device 20 and a turbine device 30 provided on the opposite side of the shaft 12 from the compressor device 20. The compressor device 20 includes a compressor wheel 22 attached to one end side of the shaft 12, and the turbine device 30 includes a turbine wheel 32 attached to the other end side of the shaft 12. The compressor device 20 includes a compressor housing 24 that houses the compressor wheel 22, and the turbine device 30 includes a turbine housing 34 that houses the turbine wheel 32. The bearing housing 14 is arranged between the compressor housing 24 and the turbine housing 34, and the shaft 12 is rotatably supported by a radial bearing 16 provided in the bearing housing 14. The shaft 12, the compressor wheel 22, and the turbine wheel 32 are connected or connected to each other to form an integral body as a whole.

Exhaust gas sent from an internal combustion engine (not shown) is taken into the turbine housing 34, and the exhaust gas causes the turbine wheel 32 to rotate. The rotation of the turbine wheel 32 is transmitted to the compressor wheel 22 via the shaft 12. By rotating the compressor wheel 22, the air entering the compressor housing 24 can be compressed by centrifugal force and supplied to the internal combustion engine.

(Compressor device configuration)
Next, the configurations of the compressor devices 20 (20A, 20B, 20C) according to some embodiments will be described with reference to FIGS. 2 to 5 and 7. As shown in FIGS. 2 to 5, the compressor device 20 includes a shaft 12 and compressor wheels 22 (22A, 22B), and the compressor wheel 22 is housed in the compressor housing 24 as shown in FIG. .. The compressor wheel 22 transports the hub portion 40 and a plurality of compressor blades 42 provided on the outer peripheral surface of the hub portion 40. A bottomed insertion hole 44 is formed in the hub portion 40 along the axis CA of the shaft 12 and the compressor wheel 22, and one end of the shaft 12 is inserted into the insertion hole 44. At least a part of the insertion portion 12a of the shaft 12 to be inserted into the insertion hole 44 is adhered to the wall surface forming the insertion hole 44 with an adhesive.

According to these embodiments, since the screw thread is not formed on the outer peripheral surface of the insertion portion 12a as in the screw fastening method, stress concentration does not occur. Therefore, the risk of damage such as fatigue fracture can be reduced. In addition, since the screws are not fastened, there is no risk of damage or loosening of the screw portion, and screw processing is not required, so that the manufacturing man-hours and costs can be reduced. Further, since the grip portion at the tip of the compressor wheel (for example, the grip portion for mounting a torque wrench or the like) is not required for screwing, the pressure loss of the gas sucked by the compressor wheel 22 can be reduced. Further, since the screw thread is not formed on the outer peripheral surface of the insertion portion 12a, the diameter of the insertion portion 12a can be increased, and thus the adhesive area by the adhesive can be increased, so that the adhesion strength can be improved.

Until now, since there is generally concern about aging deterioration of the adhesive, the idea of using the adhesive as a means for attaching the shaft 12 to the compressor wheel 22 has not been made. In particular, application to an exhaust turbocharger or the like in which high-temperature exhaust is introduced is not considered because there is a concern about the high-temperature durability of the adhesive.
The present inventors have obtained the finding that the adhesive can be applied in the above fields by conducting various verifications. As the adhesive, for example, a heat-curable epoxy resin-based adhesive can be used from the viewpoint of adhesive strength, heat resistance, and low curing temperature.

In one embodiment, as shown in FIGS. 2 to 5, a boss portion 40a projecting to the opposite side to the tip end side of the hub portion 40 is formed at a central portion of the back surface 50 of the compressor wheel 22. An insertion hole 44 is opened at the center of the axial end surface of the boss portion 40a.

FIG. 1 illustrates a turbocharger as an application destination of the compressor device 20 according to the above embodiment, but the application destination of the compressor device 20 is not limited to the turbocharger. For example, it can be applied to industrial centrifugal compressors and blowers other than turbochargers.

In one embodiment, as shown in FIGS. 2 and 4, on the tip end side of the hub portion 40 from the leading edge of the compressor blade 42, the outer peripheral surface of the hub portion 40 is radially inside toward the tip end side of the hub portion 40. It includes an inclined surface portion 46 extending to the surface and a curved surface portion 48 formed on the tip end side of the hub portion 40 with respect to the inclined surface portion 46. As a result, the hub portion 40 on the tip side of the leading edge of the compressor blade 42 can be formed in a streamlined manner, so that the pressure loss of the gas sucked into the compressor wheel 22 from the gas inlet portion (not shown) provided in the compressor housing 24. Can be reduced.

In one embodiment, as shown in FIGS. 2 and 4, the curved surface portion 48 is formed by an arc in a front view. Further, in one embodiment, as shown in FIG. 2, the outer edge of the vertical cross section along the axial direction of the curved surface portion 48 passes through the boundary between the inclined surface portion 46 and the curved surface portion 48, and is a line R perpendicular to the axis CA. It is composed of an arc having a radius b with the intersection of the axis CA and the axis CA as the center of curvature C.

In one embodiment, there is no step between the inclined surface portion 46 and the curved surface portion 48. Further, in another embodiment, there is no inflection point at the boundary between the inclined surface portion 46 and the curved surface portion 48. As a result, the pressure loss of the gas sucked into the compressor wheel 22 can be reduced.

In one embodiment, as in the compressor devices 20 (20B, 20C) shown in FIGS. 2 and 7, the insertion hole 44 includes a first hole portion 44a and a second hole portion 44b. The first hole portion 44a extends from the back surface 50 of the compressor wheel 22 (22A) along the axis CA toward the tip end side of the hub portion 40. The second hole portion 44b has a diameter smaller than that of the first hole portion 44a, and extends from the tip end of the first hole portion 44a toward the tip end side of the hub portion 40 along the axis CA. On the other hand, the insertion portion 12a of the shaft 12 includes the first shaft portion 52 and the second shaft portion 54. The outer peripheral surface of the first shaft portion 52 is adhered to the wall surface (first wall surface) forming the first hole portion 44a with an adhesive to form the bonded portion. The second shaft portion 54 fits into the second hole portion 44b and has a role of centering the shaft 12 in the insertion hole 44.

According to this embodiment, the shaft 12 can be inserted while being centered on the insertion hole 44 by fitting the second shaft portion 54 into the second hole portion 44b of the insertion hole 44. Therefore, the insertion portion 12a can be inserted without being tilted with respect to the insertion hole 44. Therefore, the axis of the shaft 12 after insertion can be aligned with the axis CA of the insertion hole 44.

In one embodiment, as shown in FIGS. 4 and 5, the wall surface forming the insertion hole 44 has a cross section orthogonal to the axis CA, the first portion 56 to which the shaft 12 fits, and the shaft 12. A second portion 58, which forms an adhesive filling space Sa in which the adhesive is filled, is included. In this embodiment, the insertion portion 12a of the shaft 12 can be centered with respect to the insertion hole 44 at the first portion 56 into which the insertion portion 12a of the shaft 12 fits. Further, by forming the adhesive filling space Sa at the second portion 58 and filling the space with the adhesive, the second portion 58 can be adhered to the insertion portion 12a. In this way, since centering and adhesion can be performed simultaneously at the same axial position with respect to the axis CA, the insertion portion 12a inserted into the insertion hole 44 can be shortened in the axial direction. As a result, the insertion hole 44 can be easily machined, and the insertion hole 44 does not have to be formed up to the axial position of the maximum outer diameter forming portion where the centrifugal stress applied to the hub portion 40 is maximized.

In one embodiment, as shown in FIG. 5, a plurality of adhesive filling spaces Sa are formed in the circumferential direction of the shaft 12, and each space extends along the axis CA direction and crosses the same in the axis CA direction. Has a face. In the embodiment exemplified in FIG. 5, four adhesive filling spaces Sa having a semicircular cross section are formed in the circumferential direction of the shaft 12.

6A to 6F are cross-sectional views corresponding to FIG. 5, and are modified examples showing the shapes of the insertion portion 12a, the insertion hole 44, and the adhesive filling space Sa formed between them.
In some embodiments shown in FIGS. 6A-6C, the insertion site 12a of the shaft 12 has a circular cross section and the insertion hole 44 has a square cross section. By such a combination of a circle and a square, a plurality of first portions 56 and second portions 58 can be formed in the same cross section in the circumferential direction. According to these embodiments, processing of the insertion hole 44 and the insertion portion 12a for simultaneously forming the first portion 56 (centering portion) and the second portion 58 (adhesion portion) at the same axial position of the hub portion 40. Becomes easier. The modified example shown in FIG. 6A has a triangular cross section of the insertion hole 44, the modified example shown in FIG. 6B has a quadrangular cross section of the insertion hole 44, and the modified example shown in FIG. 6C has a quadrangular cross section. The cross section of the insertion hole 44 has a pentagonal shape. The same number of first portions 56 as the number of angles in the cross section of the insertion hole 44 are formed.

6D to 6F show still another modification. The modified examples shown in FIGS. 6D to 6F are modified examples in which the cross section of the insertion hole 44 has a circular shape and the cross section of the insertion portion 12a has a square shape. According to these embodiments, the first portion 56 (centering portion) and the second portion 58 (adhesive portion) are simultaneously placed at the same axial position of the hub portion 40, as in the embodiments shown in FIGS. 6A to 6C. The insertion hole 44 and the insertion portion 12a for forming are easily processed. The modified example shown in FIG. 6D has a triangular cross section of the insertion site 12a, the modified example shown in FIG. 6E has a quadrangular cross section of the insertion site 12a, and the modified example shown in FIG. 6F has a quadrangular cross section. The cross section of the insertion site 12a has a pentagonal shape. Also in these modified examples, the same number of first sites 56 as the number of angles in the cross section of the insertion site 12a are formed.

In one embodiment, in the compressor device 20 (20C) shown in FIG. 7, the shaft 12 includes a large diameter portion 12b and a small diameter portion 12c having an outer diameter smaller than that of the large diameter portion 12b. The small diameter portion 12c is formed between the large diameter portion 12b and the insertion portion 12a. Then, the sleeve member 60 is attached to the small diameter portion 12c. One end side of the sleeve member 60 is adhered to the back surface 50 of the hub portion 40 with an adhesive, and the other end side is adhered to a stepped surface 62 formed between the large diameter portion 12b and the small diameter portion 12c. The sleeve member 60 is originally sandwiched and fixed by the stepped surface 62 and the compressor wheel 22 (22A), but in the present embodiment, both ends in the axial direction of the sleeve member 60 are further the back surface 50 of the hub portion 40 and the stepped surface. Since it is adhered to 62 with an adhesive, the mounting strength of 12 to the shaft can be improved.

The compressor device 20 (20C) illustrated in FIG. 7 includes a compressor wheel having the same configuration as the compressor wheel 22 (22A) shown in FIG. 2, but instead includes the compressor wheel 22 (22B) shown in FIG. You may be.
Further, the compressor wheel 22 (22A) shown in FIG. 7 is provided with a boss portion 40a at the center of the back surface 50. Then, one end side of the sleeve member 60 is adhered to the end surface 40a1 of the boss portion 40a with an adhesive.

In the exemplary embodiment shown in FIG. 7, the outer peripheral surface of the insertion site 12a and the insertion hole 44 have a diameter even smaller than that of the small diameter portion 12c. A stepped surface 70 is formed at the boundary between the insertion portion 12a and the small diameter portion 12c, and when the insertion portion 12a of the shaft 12 is inserted into the insertion hole 44, the stepped surface 70 is brought into contact with the end surface 40a1 of the boss portion 40a, whereby the shaft 12 Easy to position. Further, the adhesive strength can be further increased by filling the space between the stepped surface 70 and the end surface 40a1 of the boss portion 40a with an adhesive.

In one embodiment, the sleeve member 60 includes a thrust ring 64 and a thrust sleeve 66. One end side of the thrust ring 64 is adhered to the back surface 50 of the hub portion 40 (in the exemplary embodiment shown in FIG. 7, the end surface 40a1 of the boss portion 40a formed at the radial center portion of the back surface 50). .. The other end side surface of the thrust sleeve 66 is adhered to the stepped surface 62 with an adhesive. Then, the other end side surface of the thrust ring 64 and the one end side surface of the thrust ring 64 are adhered with an adhesive. The thrust ring 64 and the thrust sleeve 66 constituting the sleeve member 60 are sandwiched between the back surface 50 and the stepped surface 62 of the hub portions 40 originally arranged on both sides, but further, the hub portions 40 arranged on both sides. Since it is adhered to the back surface 50 and the stepped surface 62 with an adhesive and is adhered between the two with an adhesive, the mounting strength of these members at a predetermined position on the shaft can be improved.

In the exemplary embodiment shown in FIG. 7, the thrust ring 64 is composed of an annular body extending in a direction orthogonal to the axis CA, and the thrust sleeve 66 is an annular body extending in a direction orthogonal to the axis CA and the axis. It is composed of a cylindrical body extending along the CA and has an L-shaped cross section. The thrust bearing 68 has an outer end portion separated from the axis CA supported by the bearing housing 14, and an inner end portion inserted into an annular groove formed between the thrust ring 64 and the thrust sleeve 66. According to this embodiment, the thrust bearing 68 can be stably supported by the thrust ring 64 and the thrust sleeve 66, which have improved mounting strength at a predetermined position on the shaft.

In the conventional screw fastening method, the thrust ring and the thrust sleeve are fixed by the tightening force of the screw portion locked to the wall surface forming the insertion hole 44 and the insertion portion 12a. On the other hand, in the present embodiment, the thrust ring 64 and the thrust sleeve 66 are made of the hub portion 40 with an adhesive, separately from the adhesive strength of the adhesive that adheres the wall surface forming the insertion hole 44 and the insertion portion 12a. And because it is adhered to the shaft 12, the mounting strength can be improved as compared with the screw fastening method.

The contents described in each of the above embodiments are grasped as follows, for example.

1) The compressor device according to one aspect includes a compressor wheel (22 (22A, 22B)) including a hub portion (40), a plurality of compressor blades (42) provided on the outer peripheral surface of the hub portion, and the above. A compressor device (20 (20A, 20B, 20C)) including a shaft (12) inserted into a bottomed insertion hole (44) having an opening on the back surface (50) of the compressor wheel. At least a part of the insertion site (12a) inserted into the insertion hole is adhered to the wall surface forming the insertion hole with an adhesive.

According to such a configuration, since the screw thread is not formed unlike the screw fastening, stress concentration does not occur and the risk of damage such as fatigue fracture can be reduced. In addition, the risk of damage or loosening of the screw portion is eliminated, and screw processing is not required, so that the manufacturing man-hours and costs can be reduced. Further, since the grip portion at the tip of the compressor wheel, which is formed because it is necessary for screw fastening, is not required, the pressure loss of the gas sucked by the compressor wheel can be reduced.

2) The compressor device according to another aspect is the compressor device according to 1), and the outer peripheral surface of the hub portion located on the tip end side of the hub portion from the leading edge of the compressor blade is the hub portion. It includes an inclined surface portion (46) extending inward in the radial direction toward the tip end side, and a curved surface portion (48) formed on the tip end side of the hub with respect to the inclined surface portion.

According to such a configuration, the hub portion on the tip side of the leading edge of the compressor blade can be formed streamlined, so that the pressure loss of the gas sucked into the compressor wheel can be reduced.

3) The compressor device according to still another aspect is the compressor device according to 1) or 2), in which the insertion hole is a first hole portion (44a) having a first diameter and is viewed from the back surface. A first hole portion extending toward the tip end side of the hub portion and a second hole portion having a second diameter smaller than the first diameter portion, from the tip end of the first hole portion to the tip end of the hub portion. A second hole portion (44b) extending toward the side is included, and the insertion portion of the shaft is inserted into the first hole portion, and the adhesive is applied to the wall surface forming the first hole portion. It includes a first shaft portion (52) to be bonded and a second shaft portion (54) fitted into the second hole portion for centering the shaft.

According to such a configuration, the shaft can be inserted while being centered on the insertion hole by fitting the second shaft portion formed on the tip side of the first shaft portion into the first hole portion of the insertion hole. .. Therefore, the shaft can be inserted without being tilted with respect to the insertion hole, and the axis of the shaft after insertion can be aligned with the axis of the insertion hole.

4) The compressor device according to still another aspect is the compressor device according to 1) or 2), and the wall surface forming the insertion hole has a cross section orthogonal to the axis (CA) of the compressor wheel. Includes a first portion (56) into which the shaft fits and a second portion (58) that forms an adhesive filling space (Sa) between the shaft and the shaft.

According to such a configuration, by fitting the shaft to the first portion, centering of the shaft becomes possible, and at the second portion located at the same position as the first portion in the axial direction of the hub portion, the shaft and the shaft are formed. Since it is possible to adhere to the wall surface forming the insertion hole, the insertion site of the shaft can be shortened. This facilitates the processing of the insertion hole and eliminates the need to form the insertion hole up to the axial position of the maximum outer diameter forming portion where the centrifugal stress applied to the hub portion is maximized.

5) The compressor device according to still another aspect is the compressor device according to 4), in which the insertion portion of the shaft has a circular cross section and the insertion hole has a square cross section. ..

According to such a configuration, it becomes easy to process the insertion hole and the shaft for simultaneously forming the first portion and the second portion at the same position in the axial direction of the hub portion.

6) The compressor device according to still another aspect is the compressor device according to any one of 1) to 5), and the shaft has a large diameter portion (12b) and an outer diameter smaller than that of the large diameter portion. The small-diameter portion having a small diameter portion (12c) formed between the large-diameter portion and the insertion portion, and the compressor device is a sleeve member attached to the small-diameter portion. A sleeve member (60) whose one end side is adhered to the back surface of the hub portion with the adhesive and the other end side is adhered to the stepped surface (62) formed between the large diameter portion and the small diameter portion with the adhesive. ) Is further provided.

According to such a configuration, since both ends of the sleeve member mounted on the small diameter portion of the shaft are adhered to the back surface of the hub portion and the stepped surface with an adhesive, the mounting strength to the shaft can be improved.

7) The compressor device according to still another aspect is the compressor device according to 6), in which the sleeve member has a thrust ring (64) bonded to the back surface of the hub portion with the adhesive and the step. A thrust sleeve (66) adhered to the surface with the adhesive is included, and the other end side of the thrust ring and one end side of the thrust sleeve are adhered to each other.

According to such a configuration, the thrust ring and the thrust sleeve constituting the sleeve member are adhered to the members arranged between them and on both sides with an adhesive, so that the mounting strength of these members at a predetermined position on the shaft is improved. can. Therefore, the thrust shaft can be stably supported by the thrust ring and the thrust sleeve.

8) The turbocharger according to still another aspect includes a turbine device (30) including the above-mentioned compressor device and a turbine wheel (32) fixed to the shaft of the compressor device on the opposite side of the compressor wheel. It has.

According to such a configuration, screwing is not required for the insertion hole formed in the hub portion of the compressor wheel and the insertion part of the shaft, and the problem of screw fastening can be solved, and the man-hours and cost for manufacturing the compressor wheel can be solved. Can be reduced.

10 Turbocharger 12 Shaft 12a Insertion part 12b Large diameter part 12c Small diameter part 14 Bearing housing 16 Radial bearing 20 (20A, 20B, 20C) Compressor wheel 22 (22A, 22B) Compressor wheel 24 Compressor housing 30 Turbine device 32 Turbine wheel 34 Turbine Housing 40 Hub part 40a Boss part 40a1 End face 42 Compressor blade 44 Insertion hole 44a First hole part 44b Second hole part 46 Inclined surface part 48 Curved surface part 50 Back side 52 First shaft part 54 Second shaft part 56 First part 58 Second Part 60 Sleeve member 62, 70 Step surface 64 Thrust ring 66 Thrust sleeve 68 Thrust bearing C Center of curvature CA Axis line Sa Adhesive filling space r Radius

Claims (8)

A compressor wheel including a hub portion and a plurality of compressor blades provided on the outer peripheral surface of the hub portion.
A shaft inserted into a bottomed insertion hole having an opening on the back surface of the compressor wheel,
It is a compressor device equipped with
A compressor device in which at least a part of the insertion portion of the shaft inserted into the insertion hole is adhered to the wall surface forming the insertion hole with an adhesive. The outer peripheral surface of the hub portion located on the tip end side of the hub portion from the leading edge of the compressor blade is
An inclined surface portion extending inward in the radial direction toward the tip end side of the hub portion, and
A curved surface portion formed on the tip end side of the hub with respect to the inclined surface portion, and
The compressor device according to claim 1. The insertion hole is
A first hole portion having a first diameter, which extends from the back surface toward the tip end side of the hub portion, and a first hole portion.
A second hole having a second diameter smaller than the first diameter, and a second hole extending from the tip of the first hole toward the tip side of the hub.
Including
The insertion site of the shaft
A first shaft portion that is inserted into the first hole portion and is adhered to the wall surface forming the first hole portion with the adhesive.
A second shaft portion fitted in the second hole portion for centering the shaft, and a second shaft portion.
The compressor device according to claim 1 or 2. The wall surface forming the insertion hole has a cross section orthogonal to the axis of the compressor wheel.
The first part where the shaft fits and
The compressor device according to claim 1 or 2, further comprising a second portion forming an adhesive filling space in which the adhesive is filled with the shaft. The insertion site of the shaft has a circular cross section and has a circular cross section.
The compressor device according to claim 4, wherein the insertion hole has a square cross section. The shaft includes a large-diameter portion, a small-diameter portion having an outer diameter smaller than that of the large-diameter portion, and a small-diameter portion formed between the large-diameter portion and the insertion portion.
The compressor device is a sleeve member attached to the small diameter portion, one end side of which is adhered to the back surface of the hub portion with the adhesive, and the other end side is formed between the large diameter portion and the small diameter portion. The compressor device according to any one of claims 1 to 5, further comprising a sleeve member adhered to the stepped surface with the adhesive. The sleeve member includes a thrust ring bonded to the back surface of the hub portion with the adhesive and a thrust sleeve bonded to the stepped surface with the adhesive.
The compressor device according to claim 6, wherein the other end side of the thrust ring and one end side of the thrust sleeve are bonded with the adhesive. The compressor device according to any one of claims 1 to 7.
A turbine device including a turbine wheel fixed on the shaft of the compressor device on the side opposite to the compressor wheel.
With
Turbocharger.

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