JP6512761B2 - Method of manufacturing supercharger and heat shield plate - Google Patents

Description

  The present invention relates to a supercharger applied to an internal combustion engine and a method of manufacturing a heat shield plate used in the supercharger.

  A turbocharger applied to an internal combustion engine sucks in air by a turbine that rotates a turbine impeller by supply of exhaust gas, and a compressor impeller coaxially connected to the turbine impeller. And a compressor impeller for drawing in air and compressing the air, and supplying the compressed air to the engine. The turbine wheel and the compressor wheel are connected to one another by a rotating shaft (shaft) in a bearing housing provided between the turbine and the compressor.

  In this supercharger, while the turbine side is heated by the exhaust gas, while the bearing housing side is cooled to a relatively low temperature by cooling, in order to suppress heat transfer from the turbine side to the bearing housing side And an annular heat shield plate (see, for example, Patent Document 1).

JP 2012-229676 A

  Generally, the heat shield plate is manufactured by means of sheet metal processing such as pressing or drawing, or by cutting from a metal material of cast or round material. However, lower cost manufacturing is required than these methods.

  This invention is made in view of the above, and an object of the present invention is to provide a manufacturing method of a supercharger provided with a heat shield which can be manufactured at lower cost and a heat shield.

  In order to achieve the above object, a turbocharger according to one aspect of the present invention is a turbine housing between a turbine housing that accommodates a turbine wheel coupled to a rotating shaft and a bearing housing, around the rotating shaft. The heat shield plate includes an annular heat shield plate disposed opposite to the rear surface of the impeller and having an outer peripheral edge held by the turbine housing and the bearing housing, the heat shield plate having a first surface formed by casting; And a second surface formed by shaving.

  Further, in the method of manufacturing a heat shield plate according to one aspect of the present invention, in a turbocharger, a turbine housing between a turbine housing for accommodating a turbine wheel connected to a rotation shaft and a bearing housing, What is claimed is: 1. A method of manufacturing a toroidal heat shield plate which is disposed to face the back of a turbine wheel at its periphery and whose outer peripheral edge is sandwiched between a turbine housing and a bearing housing. , And an abrading process step of abrading a part of the surface of the casting.

  According to the method of manufacturing a heat shield plate used in the above-described turbocharger and turbocharger, the heat shield plate is manufactured by shaving a part of the surface after the step of manufacturing a casting by casting . By using the casting surface of the casting as a part of the surface of the heat shield plate, it is possible to reduce the number of steps in the cutting process compared to the conventional case of performing the entire surface cutting process, and in particular By reducing the cost of the cutting process, the cost of manufacturing the heat shield plate can be reduced. Moreover, since the supercharger to which such a heat shield board is applied can reduce the cost concerning manufacture of a heat shield board, it can also reduce the manufacturing cost as the whole supercharger.

  Here, in the heat shield plate, at least a part of the surface facing the back surface of the turbine wheel may be the second surface.

  At least a part of the surface of the heat shield plate facing the turbine wheel is used as the second surface formed by shaving, so that the surface is finely processed according to the shape of the turbine wheel, for example. It is also possible to improve the performance of the heat shield plate.

  In the heat shield plate, at least a part of the outer peripheral edge portion may be a second surface.

  By making the outer peripheral edge part pinched | interposed by the turbine housing and the bearing housing among heat shield boards into a 2nd surface, pinching of a heat shield board can be performed more reliably.

  In the heat shield plate, an end portion facing the rotation axis may be a second surface.

  By setting the end of the heat shield plate opposite to the rotation axis as the second surface, for example, this end can be fitted. When the end opposite to the rotating shaft is fitted, the number of steps in the shaving process can be reduced, and the work for attaching the heat shield to the supercharger becomes easy, and the cost of manufacturing the supercharger can be reduced. It can be reduced.

  Moreover, it can be set as the aspect by which an unevenness | corrugation is provided in at least one of the surface by the side of a turbine housing and bearing housing among heat shields.

  By providing the heat shielding plate with asperities, the surface area of the heat shielding plate is increased, so the heat shielding performance is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of a supercharger provided with the heat shield board which can be manufactured at low cost, and a heat shield board is provided.

It is a schematic block diagram of a supercharger. It is an enlarged view of the connection part of a turbine housing and a bearing housing. It is a perspective view of a heat shield plate. It is a section arrow line view along an axis of a heat shield plate. It is a flowchart explaining the manufacturing method of a heat shield board. It is a figure explaining the casting part and shaving process part in the manufacturing method of a heat shield plate. Fig.7 (a) is a figure explaining the conventional heat-insulation board, FIG.7 (b) is a figure explaining the casting part in the manufacturing process of a heat-insulation board, and a shaving process part. Fig.8 (a) is a figure explaining the heat shield board which concerns on a 1st modification, and FIG.8 (b) is a figure explaining the manufacturing method of a heat shield board. Fig.9 (a) is a figure explaining the heat shield board which concerns on a 2nd modification, FIG.8 (b) is a figure explaining the manufacturing method of a heat shield board. Fig.10 (a) is an Xa arrow line view of the heat-insulation board which concerns on the 2nd modification shown in FIG. 9 (a), FIG.10 (b) is the Xb arrow line view.

  Hereinafter, with reference to the accompanying drawings, modes for carrying out the present invention will be described in detail. In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description.

  As shown in FIG. 1, the supercharger 1 includes a turbine 10 and a compressor 20 (a centrifugal compressor). The turbine 10 includes a turbine housing 11 and a turbine wheel 12 housed in the turbine housing 11. The compressor 20 includes a compressor housing 21 and a compressor wheel 22 housed in the compressor housing 21. The turbine wheel 12 is provided at one end of a rotating shaft 32 extending along the direction of the axis X, and the compressor wheel 22 is provided at the other end of the rotating shaft 32. A bearing housing 31 is provided between the turbine housing 11 and the compressor housing 21. The rotating shaft 32 is rotatably supported by the bearing housing 31 via a bearing 33, and the rotating shaft 32, the turbine wheel 12, and the compressor wheel 22 rotate as an integral rotating body.

  The turbine housing 11 is provided with an exhaust gas inlet 15 and an exhaust gas outlet 16. Exhaust gas discharged from an internal combustion engine (not shown) flows into the turbine housing 11 through the exhaust gas inlet 15 to rotate the turbine wheel 12 and then to the outside of the turbine housing 11 through the exhaust gas outlet 16 leak.

  The compressor housing 21 is provided with a suction port 25 and a discharge port (not shown). As described above, when the turbine wheel 12 rotates, the compressor wheel 22 rotates via the rotating shaft 32. The external air introduced from the filter 41 of the silencer 40 by the rotation of the compressor wheel 22 is sucked through the suction port 25, passes through the scroll portion 23, and is discharged from the discharge port. The compressed air discharged from the discharge port is supplied to the aforementioned internal combustion engine.

  The bearing housing 31 is provided with a lubricating oil channel 34 which constitutes a cooling means and is used to lubricate the bearing 33. The bearing housing 31 is also provided with a lubricating oil supply channel 35 connected to the lubricating oil channel 34. By supplying the lubricating oil to the lubricating oil passage 34, the inside of the bearing housing 31 is maintained at a predetermined temperature. The bearing housing 31 may be provided with a cooling water flow passage (not shown) which constitutes a cooling means.

  Next, with reference to FIG. 2, a connection portion between the turbine housing 11 and the bearing housing 31 will be described. The turbine housing 11 is provided with a projecting portion 13 projecting from the turbine 10 side to the outer periphery of the bearing housing 31, and when viewed along the axis X direction on the inner peripheral side (axis X side) than the projecting portion 13 It has the level | step-difference part 14 dented in the turbine 10 side rather than the overhang | projection part 13. As shown in FIG. In the step portion 14, a flat portion 14a extending in a direction orthogonal to the axis X and an inner wall portion 14b which is continuous on the inner peripheral side with respect to the flat portion 14a and is inclined in a direction along the axis X with respect to the flat portion 14a. And. The turbine impeller 12 and the rotation shaft 32 are provided on the inner peripheral side of the inner wall portion 14 b of the turbine housing 11.

  The bearing housing 31 has a flange-like protruding portion 36 that protrudes in the outer peripheral direction (direction of the overhang portion 13 of the turbine housing 11) at an end on the turbine 10 side. A pressing plate 37 is disposed on the outer peripheral side of the projecting portion 36, and the bolt 60 is fastened via the pressing plate 37. A plurality of bolts 60 are disposed on the outer periphery of the protrusion 36. Thereby, the bearing housing 31 and the turbine housing 11 are fixed to each other.

  The end face of the protruding portion 36 of the bearing housing 31 on the side of the turbine 10 has a shape corresponding to the shapes of the overhanging portion 13 and the step portion 14 of the turbine housing 11. Among these, in a region facing the flat surface portion 14 a of the turbine housing 11, a flat surface portion 36 a facing the flat surface portion 14 a is provided. Further, on the inner peripheral side of the flat surface portion 36a, a wall portion 36b continuous from the flat surface portion 36a and extending along the axis X, and a sloped portion 36c inclined toward the axial line X relative to the flat surface 36a are provided.

  Further, on the inner side of the protruding portion 36 of the bearing housing 31, there is provided a second protruding portion 38 which protrudes to the inner peripheral side on the turbine 10 side with respect to the lubricating oil flow path 34. The second projection 38 contacts the seal ring 39 attached to the outer periphery of the rotary shaft 32 on the inner race side, thereby forming a seal 70 that divides the turbine 10 and the bearing housing 31. Thus, a space S surrounded by the turbine housing 11, the turbine impeller 12 and the bearing housing 31 is formed. In a space S surrounded by the turbine housing 11, the turbine impeller 12 and the bearing housing 31, an annular heat shield plate 50 is attached around the rotation shaft 32.

  The heat shield plate 50 is used to block the heat transmitted from the turbine 10 side. The heat shield plate 50 is made of a heat insulating metal. FIG. 3 is a schematic perspective view of the heat shield plate 50, and FIG. 4 is a cross-sectional view of the heat shield plate 50 along the axis X. As shown in FIG. 3 and FIG. 4 etc., the heat shield plate 50 has a through hole 51 for allowing the rotation shaft 32 to pass along the central axis X, and extends radially outward as well as the turbine wheel 12 And a first flat plate portion 52 disposed apart from the bearing housing 31, and extending radially outward continuously from the first flat plate portion 52 and a rear surface 12a of the turbine wheel 12 (a surface on the side of the rotation shaft 32, And a side wall 54 extending continuously from the second flat plate 53 and having an outer peripheral side along the inner wall 14 b of the turbine housing 11. And an outer peripheral edge 55 extending outward in the radial direction from an end opposite to the end of the side wall 54 continuous with the second flat plate 53.

  The outer peripheral edge 55 of the heat shield plate 50 is sandwiched by the flat portion 14 a of the turbine housing 11 and the flat portion 36 a of the bearing housing 31. Thus, the heat shield plate 50 is attached between the turbine housing 11 and the bearing housing 31 in a state of facing the back surface 12 a of the turbine impeller 12. By the heat shield plate 50 being attached, the heat transfer from the turbine 10 side to the bearing 33 and the compressor 20 side is suppressed.

  The heat shield plate 50 is made of cast iron such as FDC 400 or FDC 450, and the thickness can be appropriately changed, but can be 3 mm to 6 mm. When the thickness is 6 mm or less, high heat shielding performance can be obtained with respect to the thickness of the heat shielding plate 50, so the thickness is preferably 6 mm or less. The thickness refers to the thickness in the direction perpendicular to each surface of the heat shield plate 50.

  Here, the heat shield plate 50 according to the present embodiment is configured to include a first surface and a second surface whose surface roughness is smaller than the first surface. Specifically, in the heat shield plate 50 shown in FIG. 4, the inner surface 52 a of the first flat plate 52 on the bearing housing 31 side, the inner surface 53 a of the second flat plate 53 on the bearing housing 31 side, and the sidewall 54 Among them, the inner surface 54a on the bearing housing 31 side corresponds to the first surface. Further, in other areas, that is, the inner wall surface 51a of the through hole 51 of the first flat plate portion 52, the opposite surface 52b to the back surface 12a of the turbine wheel 12, and the back surface of the turbine wheel 12 of the second flat plate portion 53. The surface 53 b facing the surface 12 a, the surface 54 b facing the inner wall 14 b of the turbine housing 11 in the side wall 54, and the surface of the outer peripheral edge 55 correspond to the second surface. Thus, the first surface is constituted by the surface on the bearing housing 31 side, and the second surface is constituted by the surface on the turbine 10 side. In addition, "surface roughness" points out arithmetic mean roughness Ra.

  The reason why the surface of the heat shield plate 50 has different surface roughness is the method of manufacturing the heat shield plate 50. The heat shield plate 50 according to the present embodiment is manufactured by forming a casting by casting and then shaving a part of the surface thereof. That is, as shown in FIG. 5, the method of manufacturing the heat shield plate 50 includes a step of preparing a form (S01), a casting step (S02) of pouring a metal into the form and forming a casting, and a casting step. And a cutting process step (S03) of forming a part of the surface of the obtained casting by shaving. In the heat shield plate 50 described above, the first surface is a surface obtained by using the surface of the casting obtained in the casting step (S02) as it is, and the second surface is processed in the shaving step (S03) It is another side.

  In order to manufacture such a heat shield plate 50, it is necessary to make the shape of the casting obtained in the previous step of the heat shield plate 50 correspond to the shape of the heat shield plate 50. As shown in FIG. 6, first, in the casting step (S02), casting is performed by preparing an annular mold having a cross-sectional shape indicated by a solid line L1 and a broken line L2. Thereby, the casting in which the casting surface (surface of a casting) was formed in the shape shown by the continuous line L1 and the broken line L2 is obtained. Here, in the formwork, the formwork of the region indicated by the solid line L1 has a shape corresponding to the shape of the heat shield plate 50. Thereby, the casting surface of the area | region shown by the continuous line L1 is utilized for the heat shield plate 50 as it is.

  Thereafter, in the cutting process (S03), the casting is cut until the region corresponding to the broken line L2 in FIG. 6 in the casting has a shape shown by the solid line L3. In this case, the outer periphery is processed while supporting the solid line L1 side using the cast surface. At this time, by forming the inner wall surface 51a of the through hole 51 in the heat shield plate 50 as the fitting portion 80, the working process of the shaving process can be further shortened.

  Thus, in the heat shield plate 50 included in the turbocharger 1 according to the present embodiment, the first surface obtained by casting and the first surface obtained by shaving And a second surface that is smaller. The conventional heat shield plate 50 generally uses a method of manufacturing by so-called sheet metal processing of pressing or drawing a metal plate, or a method of manufacturing by general surface cutting after casting. Among these, in the conventional manufacturing method by sheet metal processing, the cost of initial investment such as preparation of a die for performing press processing or drawing processing is increased, which is high cost. In addition, even if the method of performing the entire surface cutting process after casting is adopted, the cost is high. Specifically, as shown in FIG. 7A, the heat shield plate 90 obtained by the conventional overall surface cutting process is similar in cross-sectional shape to the heat shield plate 50 according to the present embodiment, but the thickness is thin. And as shown in FIG.7 (b), after forming the casting which makes the cross-sectional shape shown by the broken line L4 by casting, the whole surface cutting process is performed, The shape shown by the continuous line L5, ie, FIG. 7 (a) The conventional heat shield plate 90 having the cross-sectional shape shown was obtained. In this case, since the thickness can be reduced by shaving, a large space S surrounded by the turbine impeller 12 and the bearing housing 31 can be secured. However, in the entire surface cutting process, the number of steps increases, and the cost in the cutting process increases, which causes the cost increase of the heat shield plate production.

  On the other hand, according to the supercharger 1 and the heat shield plate 50 manufacturing method to which the heat shield plate 50 according to the present embodiment is applied, a part of the heat shield plate 50 is cut after the step of manufacturing a casting by casting. Manufacture by doing. By using the casting surface of the casting as a part of the surface of the heat shield plate, it is possible to reduce the number of steps in the cutting process as compared to the case where the entire surface cutting process is performed. The cost concerning manufacture of the heat shield board 50 can be reduced by reducing the cost concerning said. Moreover, since the supercharger 1 to which such a heat shield board 50 is applied can reduce the cost concerning manufacture of the heat shield board 50, it can also reduce the manufacturing cost as the supercharger 1 whole. .

  Moreover, when the heat shield plate 50 is manufactured by said manufacturing method, it can cut based on the surface (1st surface) which utilizes the cast surface of the casting obtained by casting. In particular, in the heat shield plate 50 according to the present embodiment, the heat shield plate 50 and the bearing housing 31 are made by particularly processing the surface to be the turbine 10 side with the surface to be the bearing housing 31 side as the first surface. The air layer between them can be reliably secured, and the heat dissipation performance of the heat shield plate 50 can be maintained high.

  The heat shield plate 50 includes a first surface obtained by casting and a second surface obtained by shaving and having a surface roughness smaller than the first surface. The outer peripheral edge 55 held by the housing 11 and the bearing housing 31 is constituted by the second surface obtained by shaving. In order to ensure that the heat shield plate 50 is securely fixed between the turbine housing 11 and the bearing housing 31, the outer peripheral edge 55 is held between the turbine housing 11 and the bearing housing 31. It is preferable that the surface roughness is made small so that both can reliably hold the surface.

  In addition, high dimensional accuracy is also required for the inner wall surface 51a of the through hole 51 which becomes the fitting portion 80 which is important when processing the heat shield plate 50 and assembling the turbocharger 1, and therefore, it is formed by shaving Configured by the second surface.

  The region other than the above on the surface of the heat shield plate 50 can be changed as appropriate whether it is the first surface using the casting surface of the casting or the second surface formed by shaving. When the heat shield plate 50 of the above embodiment has a configuration in which the turbine 10 side is cut, it is possible to facilitate shape change such that the heat shield performance of the heat shield plate 50 is improved. . As an example of such a shape, the inner wall 14b of the turbine housing 11 and the back surface 12a of the turbine impeller 12 can be formed by adopting a shape corresponding to the shapes of the inner wall 14b of the turbine housing 11 and the back surface 12a of the turbine impeller 12 The space S1 (see FIG. 2) between the heat shield plate 50 and the heat shield plate 50 can be made smaller. The heat shield plate 50 having such a shape can reduce the amount of leakage of the exhaust gas to the back surface 12 a side of the turbine wheel 12. By suppressing the leakage amount of the exhaust gas to the back surface 12 a side of the turbine impeller 12, the heat shielding performance by the heat shielding plate 50 can be improved, and the performance deterioration of the turbine 10 itself can also be prevented.

  Next, a first modification of the heat shield plate will be described with reference to FIG. Although the heat shield plate 50a has the same shape as the heat shield plate 50 described in the above embodiment, the thickness of each portion of the heat shield plate 50a is reduced. Further, the arrangement of the first surface and the second surface is similar to that of the heat shield plate 50. Such a heat shield plate 50a performs casting by preparing an annular mold having a cross-sectional shape shown by the solid line L6 and the broken line L7 in FIG. 8B in the casting step (S02). Thereby, the casting in which the casting surface (surface of the casting) was formed in the shape shown by the solid line L6 and the broken line L7 is obtained. Here, the mold of the region indicated by the solid line L6 has a shape corresponding to the shape of the heat shield plate 50a. Thereby, the casting surface of the area | region shown by the continuous line L6 is utilized for the heat shield plate 50a as it is.

  Thereafter, in the cutting process (S03), the casting is cut until the region corresponding to the broken line L7 in FIG. 8B in the casting has a shape shown by the solid line L8. In this case, the outer periphery is processed while supporting the solid line L6 side using the cast surface. At this time, similarly to the heat shield plate 50, a portion to be the inner wall surface 51a of the through hole 51 in the heat shield plate 50a is a fitting portion 80a. Thereby, the heat shield plate 50a is obtained.

  When a heat shield plate having a small thickness such as the heat shield plate 50a is manufactured, the amount of scraping of the casting may be reduced by changing the form at the time of casting to a smaller one. It may respond by increasing the amount of cutting of the casting after using the same mold as the heat plate 50. The shape can be properly determined by any method.

  Next, a second modification of the heat shield plate will be described with reference to FIGS. 9 and 10. The heat shield plate 50b according to the second modification is different from the heat shield plate 50 in that unevenness is provided on the surfaces on the turbine housing 11 side and the bearing housing 31 side. Specifically, as shown in FIG. 9 and FIG. 10A, the inner surface 52a of the first flat plate 52 on the bearing housing 31 side, the inner surface 53a of the second flat plate 53 on the bearing housing 31, and A plurality of hemispherical projections 57 are provided on the inner surface 54 a of the side wall 54 on the bearing housing 31 side. In the heat shield plate 50 b, a plurality of convex portions 57 are arranged on the first flat plate portion 52 and the second flat plate portion 53 along the radial direction. Further, as shown in FIG. 10B, a plurality of groove portions 58 are formed in the surface 53b of the second flat plate portion 53 of the heat shield plate 50b that faces the back surface 12a of the turbine wheel 12. The unevenness is formed on the facing surface 53b.

  The arrangement of the first surface and the second surface of the heat shield plate 50b is the same as that of the heat shield plate 50. That is, the convex portion 57 is formed on the surface of the cast surface obtained by the casting which is the first surface, and the groove portion 58 is formed on the surface obtained by the shaving processing which is the second surface. It is

  The heat shield plate 50b can also be manufactured by using casting and cutting, as in the case of the heat shield plates 50, 50a. Specifically, in the casting step (S02), casting is performed by preparing an annular mold having a cross-sectional shape indicated by the solid line L9 and the broken line L10 in FIG. 9 (b). Thereby, the casting in which the casting surface (surface of casting) was formed in the shape shown by the continuous line L9 and the broken line L10 is obtained. At this time, as shown by the solid line L9, the concavities and convexities corresponding to the convex portions 57 are provided on the formwork, whereby the convex portions 57 are formed on the surface of the obtained casting and the cast surface corresponding to the solid line L9 It is used for the board 50b.

  Thereafter, in the cutting process (S03), the casting is cut until the region corresponding to the broken line L10 in FIG. 9B in the casting has a shape shown by the solid line L11. At this time, similarly to the heat shield plate 50, a portion to be the inner wall surface 51a of the through hole 51 in the heat shield plate 50a is a fitting portion 80b. In addition, a cutting process is performed to form the groove 58. Thereby, the 2nd surface which has an unevenness | corrugation is obtained by shaving.

  The heat shielding plate 50b according to the second modification has heat dissipation because the surface area of the heat shielding plate 50b as a whole is increased by providing unevenness on the surfaces on the turbine housing 11 side and the bearing housing 31 side. As a result, the performance as the heat shield plate 50b is improved. In addition, the heat capacity of the heat shield plate 50b can be reduced. The unevenness may be provided on only one of the surfaces of the turbine housing 11 and the bearing housing 31. Even in this case, the surface area of the heat shield plate 50b as a whole is increased. The performance as the heat shield plate 50b is improved.

  Further, in the case where the unevenness (groove 58) is provided on the opposing surface 53b of the second flat plate 53 on the turbine 10 side with the back surface 12a of the second flat plate 53 like the heat shield plate 50b, this unevenness is By functioning as a labyrinth seal between the back surface 12a of the turbine wheel 12 and the facing surface 53b of the heat shield plate 50b, the amount of leakage of exhaust gas to the back surface 12a of the turbine wheel 12 can be further reduced.

  As mentioned above, although the superheater provided with the heat shield board concerning the embodiment of the present invention and the manufacturing method of the heat shield board were explained, the present invention is not necessarily limited to the embodiment mentioned above, and does not deviate from the gist Various changes can be made within the scope.

  For example, the shapes of the heat shield plate and the turbocharger according to the above-described embodiment are merely examples, and may be changed as appropriate without departing from the spirit of the present invention. For example, in the turbine housing 11, a nozzle for adjusting the flow of exhaust gas may be provided on the outer peripheral side of the turbine impeller 12. Even with the turbocharger having such a configuration, the heat shield plate according to the above embodiment can be applied.

  Moreover, although the case where the press board 37 and the bolt 60 were used was demonstrated as an example of the fixing method of the bearing housing 31 and the turbine housing 11 in the said embodiment, it is good also as a structure fixed by another method. Other methods include, for example, a method of fastening flanges provided on both the bearing housing 31 and the turbine housing 11 with bolts, a method of sandwiching the flanges with a V-band, and fastening. As described above, the method of fixing the bearing housing 31 and the turbine housing 11 is not limited, and can be changed as appropriate.

  Moreover, when providing an unevenness | corrugation in the surface by the side of the turbine housing and bearing housing of a heat insulation board, the shape is not limited to the shape shown to the above-mentioned embodiment, It can change suitably. Also, the number of asperities may be changed as appropriate.

  Moreover, in the heat shield board which concerns on the said embodiment, although the fitting part was made into the inner wall surface of the through-hole of the center, the position of a fitting part can be changed suitably. When the position of the fitting portion is changed, it is preferable that the area to be the fitting portion is processed by shaving.

DESCRIPTION OF SYMBOLS 1 Turbocharger 10 Turbine 11 Turbine housing 12 Turbine impeller 12a Back surface 13 Projection part 14 Step part 14a Flat part 14b Inner wall part 15 Exhaust gas inlet 16 Exhaust gas outlet 20 Compressor 21 Compressor housing 22 Compressor wheel 25 Inlet Reference Signs List 31 bearing housing 32 rotary shaft 33 bearing 34 lubricating oil flow path 35 lubricating oil supply flow path 36 projecting portion 36 a flat portion 36 b wall portion 36 c inclined portion 37 pressing plate 38 second projecting portion 39 seal ring 40 silencer 41 filters 50, 50 a , 50b heat shield plate 51 through hole 51a inner wall surface 52 first flat plate portion 52a inner surface 52b facing surface 53 second flat plate portion 53a inner surface 53b facing surface 54 side wall portion 54a inner surface 54b facing surface 55 outer peripheral edge portion 57 convex portion 58 groove portion 60 bolt 70 seals 80, 0a, 80b fitting portion 90 heat shielding plate S, S1 space X axis

Claims (5)

The turbine housing is disposed between the turbine housing, which accommodates a turbine wheel connected to a rotating shaft, and a bearing housing, and is disposed opposite to the back surface of the turbine wheel around the rotating shaft, and the outer peripheral edge is the turbine An annular heat shield plate sandwiched by a housing and the bearing housing;
The heat shield plate is seen containing a first surface formed by casting, and a second surface formed by cutting machining, and
The supercharger whose inner wall surface of the through-hole which the said rotating shaft passes is the said 2nd surface .   The turbocharger according to claim 1, wherein at least a part of a surface of the heat shield plate facing the back surface of the turbine wheel is the second surface.   The supercharger according to claim 1 or 2, wherein at least a part of the outer peripheral edge portion of the heat shield plate is the second surface. The supercharger according to any one of claims 1 to 3 , wherein in the heat shield plate, at least one of the surfaces on the turbine housing side and the bearing housing side is provided with asperities. In a supercharger, the turbine housing is disposed between a turbine housing that accommodates a turbine wheel coupled to a rotation shaft, and a bearing housing, and is disposed opposite the back surface of the turbine wheel around the rotation shaft, A method of manufacturing an annular heat shield plate, the peripheral portion of which is sandwiched between the turbine housing and the bearing housing,
A casting process for producing castings by casting,
A cutting process step of cutting and processing a part of the surface of the casting;
I have a,
The manufacturing method of the heat-insulation board in which the inner wall face of the through-hole which the said rotating shaft passes is formed by shaving process .

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