Supercharger

Abstract

A supercharger is provided with: a target member (motor (70)); and a heat shield (80) that is provided between the target member and the heat source and has at least one shield member that defines a heat-insulating space around the target member, the thickness of the at least one heat-insulating space being extremely large at a position on the heat source side with respect to the target member.

Description

Technical Field

[0001] The present disclosure relates to a supercharger. This application claims the benefit of priority based on Japanese Patent Application No. 2022-183720 filed on November 16, 2022, the contents of which are incorporated herein by reference. Background Art

[0002] In a supercharger, an electric actuator such as a motor is sometimes used to drive a movable member. For example, Patent Document 1 discloses a supercharger including a motor for rotating a variable nozzle vane for adjusting the flow rate of gas delivered to a turbine impeller.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2018 / 207624 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In a supercharger, various components such as an electric actuator are heated by heat from a heat source. Therefore, it is necessary to protect various components such as the electric actuator from the heat from the heat source.

[0008] An object of the present disclosure is to provide a supercharger capable of protecting components of the supercharger from heat.

[0009] Solutions to Solve Problems

[0010] In order to solve the above-mentioned problems, the supercharger disclosed in the present invention includes: a target component; and a heat insulating cover, which is arranged between the target component and a heat source, and has at least one cover component that divides a heat insulating space around the target component, and the thickness of the at least one heat insulating space becomes maximum at a position on the heat source side of the target component.

[0011] Alternatively, the cover part includes a first cover part covering the outer surface of the target part and a second cover part covering the outer surface of the first cover part, and the insulation space includes: a first insulation space divided between the outer surface of the target part and the inner surface of the first cover part; and a second insulation space divided between the outer surface of the first cover part and the inner surface of the second cover part.

[0012] The thickness of the first heat insulating space may be maximum at a position on the heat source side of the target component.

[0013] The thickness of the second heat insulating space may be maximum at a position on the heat source side of the target component.

[0014] The first cover part and the second cover part may also be fixed to each other.

[0015] The heat insulating space may be formed to penetrate in the vertical direction.

[0016] Effects of the Invention

[0017] According to the present disclosure, it is possible to protect components of a supercharger from heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a perspective view showing a supercharger according to an embodiment of the present disclosure.

[0019] Figure 2 It is a perspective view showing a motor and a heat insulating cover according to an embodiment of the present disclosure.

[0020] Figure 3 It is a plan view showing a motor and a heat insulating cover according to an embodiment of the present disclosure.

[0021] Figure 4 It is a plan view showing a motor and a heat insulating cover according to a first modified example.

[0022] Figure 5 It is a plan view showing a motor and a heat insulating cover according to a second modified example.

[0023] Figure 6 It is a plan view showing a motor and a heat insulating cover according to a third modified example. DETAILED DESCRIPTION

[0024] Below, while referring to the attached Figure 1 The embodiments of the present disclosure are described. The dimensions, materials, and other specific numerical values ​​shown in the embodiments are merely examples for easy understanding, and do not limit the present disclosure unless otherwise specified. In addition, in this specification and the drawings, for elements having substantially the same function and structure, repeated descriptions are omitted by marking the same symbols, and elements that are not directly related to the present disclosure are omitted from the drawings.

[0025] Figure 1 1 is a perspective view showing a supercharger TC according to this embodiment. Figure 1 and the following Figures 2 to 6 The Z axis pointing vertically upward and the X axis and Y axis pointing horizontally and orthogonally to each other are shown in the figure.

[0026] like Figure 1As shown, the supercharger TC includes a turbine T and a centrifugal compressor C. The turbine T includes a turbine housing 10. A turbine impeller 20 is rotatably accommodated in the turbine housing 10. The centrifugal compressor C includes a compressor housing 30. A compressor impeller 40 is rotatably accommodated in the compressor housing 30. The turbine housing 10 and the compressor housing 30 are arranged in the X-axis direction. The turbine housing 10 and the compressor housing 30 have a substantially cylindrical shape and are arranged coaxially with each other. The central axes of the turbine housing 10 and the compressor housing 30 are parallel to the X-axis.

[0027] The turbine impeller 20 and the compressor impeller 40 are connected via a shaft 50 rotatably supported by a bearing. The turbine impeller 20, the compressor impeller 40, and the shaft 50 rotate integrally.

[0028] The supercharger TC is connected to the engine. Exhaust gas discharged from the engine flows into the turbine housing 10, causing the turbine impeller 20 to rotate. Thereafter, the exhaust gas flows out of the turbine housing 10. The rotational force of the turbine impeller 20 is transmitted to the compressor impeller 40 via the shaft 50. Through the rotation of the compressor impeller 40, external air is sucked into the compressor housing 30 and compressed, and supplied to the air intake of the engine.

[0029] The turbine T is a variable capacity turbine. An adjustment mechanism 60 for adjusting the flow rate of the exhaust gas delivered to the turbine impeller 20 is provided in the turbine housing 10. The adjustment mechanism 60 has a plurality of variable nozzle blades 61 capable of adjusting the flow path cross-sectional area of ​​the flow path on the upstream side of the turbine impeller 20. The plurality of variable nozzle blades 61 are arranged radially outside relative to the turbine impeller 20. The plurality of variable nozzle blades 61 are arranged at intervals in the circumferential direction of the turbine impeller 20. By rotating the variable nozzle blades 61, the flow path cross-sectional area changes according to the rotation angle of the variable nozzle blades 61. As a driving source for driving such an adjustment mechanism 60, a motor 70 is provided outside the turbine housing 10 and the compressor housing 30.

[0030] The motor 70 has a substantially quadrangular prism shape and is disposed between the turbine housing 10 and the compressor housing 30 in the X-axis direction. The motor 70 is located vertically above the turbine housing 10 and the compressor housing 30 and extends in the vertical direction.

[0031] The output shaft of the motor 70 is connected to the adjustment mechanism 60 in the turbine housing 10 via various components such as a connecting rod member. The variable nozzle vane 61 of the adjustment mechanism 60 rotates by the driving force output from the motor 70, and the flow path cross-sectional area changes. As a result, the flow rate of the exhaust gas delivered to the turbine impeller 20 changes.

[0032] In the supercharger TC, in order to protect the motor 70 from the heat from the heat source, a heat shield 80 is provided between the motor 70 and the heat source. Figure 1 In the figure, the heat shield 80 is simplified by a double-dashed line. As a heat source, for example, a specific portion of the turbine housing 10 can be cited. However, the heat source is not limited to the turbine housing 10. For example, the heat source may also include an exhaust manifold of an engine, etc. In the following, an example in which the component to be protected by the heat shield 80, that is, the target component, is a motor 70 is described. However, the target component may also be a component other than the motor 70.

[0033] Below, refer to Figure 2 and Figure 3 The heat insulating cover 80 will be described in detail. Figure 2 It is a perspective view showing the motor 70 and the heat insulating cover 80 according to the present embodiment. Figure 3 It is a plan view showing the motor 70 and the heat insulating cover 80 according to the present embodiment.

[0034] like Figure 2 and Figure 3 As shown, the motor 70 includes a main body 71, a connector portion 72, and a base portion 73. The main body 71 is in the shape of a roughly quadrangular prism. A stator and a rotor are built into the interior of the main body 71. The main body 71 extends in the vertical direction (i.e., the Z-axis direction). The shape of the cross section of the main body 71 in the horizontal direction (i.e., the cross section parallel to the XY plane) is a shape in which each corner of the square is recessed. The connector portion 72 extends from the upper portion of the outer peripheral surface of the main body 71 in the X-axis direction. A cable connected to a control device or the like is installed on the connector portion 72. The base portion 73 extends from the lower portion of the main body 71 to the radially outer side of the main body 71. The base portion 73 has a roughly rectangular flat plate shape. Bolt holes 74 for bolts to be inserted are formed at each corner of the base portion 73.

[0035] Hereinafter, the circumferential direction of the motor 70 and the radial direction of the motor 70 are also referred to as the circumferential direction and the radial direction. The circumferential direction of the motor 70 refers to the circumferential direction of the main body 71 with the central axis in the vertical direction as the reference. The radial direction of the motor 70 refers to the radial direction of the main body 71 with the central axis in the vertical direction as the reference.

[0036] The heat insulating cover 80 includes a first cover member 81 and a second cover member 82. As described later, the first cover member 81 and the second cover member 82 define a first heat insulating space 91 and a second heat insulating space 92 as heat insulating spaces around the motor 70. The heat insulating space is a space for blocking heat transferred to the motor 70.

[0037] The first cover member 81 covers a portion of the outer peripheral surface of the motor 70. Figure 2 and Figure 3In the example of FIG. 1 , the first cover member 81 covers the surface on the positive direction side of the X axis and the surface on the positive direction side of the Y axis of the outer peripheral surface of the main body 71 of the motor 70. The first cover member 81 is separated from the outer peripheral surface of the motor 70 in the radial direction of the motor 70 and extends in the circumferential direction. Figure 3 As shown, when viewed from above, the first cover member 81 is located at the center side in the circumferential direction (ie, Figure 3 The portion is bent at the upper right side thereof and extends in a straight line from the bent portion toward the negative direction of the X-axis and the negative direction of the Y-axis respectively.

[0038] In addition, the first cover member 81 extends in the vertical direction. The length of the first cover member 81 in the vertical direction is substantially consistent with the length of the motor 70 in the vertical direction. The vertical position of the upper end of the first cover member 81 is substantially consistent with the vertical position of the upper end of the motor 70. The vertical position of the lower end of the first cover member 81 is substantially consistent with the vertical position of the lower end of the motor 70.

[0039] A mounting member 83 is connected to the lower portion of the first cover member 81. Figure 2 as well as Figure 3 In the example, the first cover component 81 and the mounting component 83 are formed as an integral body with each other. However, the first cover component 81 and the mounting component 83 may be formed as separate bodies from each other. The mounting component 83 is a component for mounting the first cover component 81 on the motor 70. The mounting component 83 extends in a horizontal direction from the lower portion of the first cover component 81 toward the motor 70 side. The mounting component 83 is formed in a substantially rectangular flat plate shape. The lower surface of the base portion 73 of the motor 70 overlaps with the upper surface of the mounting component 83. A through hole is formed in the mounting component 83 at a position opposite to the bolt hole 74. The mounting component 83 is mounted on the motor 70 by means of a bolt (not shown) inserted through the bolt hole 74 and the through hole.

[0040] The second cover member 82 covers the outer surface of the first cover member 81. The surface of the first cover member 81 on the motor 70 side is the inner surface of the first cover member 81, and the surface of the first cover member 81 on the side opposite to the motor 70 is the outer surface of the first cover member 81. The second cover member 82 extends in the circumferential direction. In the circumferential direction, the range where the first cover member 81 exists is substantially the same as the range where the second cover member 82 exists.

[0041] like Figure 3As shown, the first cover component 81 and the second cover component 82 are fixed to each other in the region R1 on one end side and the region R2 on the other end side in the circumferential direction of the motor 70. For example, the first cover component 81 and the second cover component 82 are fixed to each other by welding. However, the first cover component 81 and the second cover component 82 may be fixed to each other by a method other than welding, such as rivets or bolts. In the region other than the region R1 and the region R2 in the circumferential direction, the second cover component 82 is separated in the radial direction from the outer surface of the first cover component 81. Figure 3 As shown, when viewed from above, the second cover member 82 is located at the center side in the circumferential direction (ie, Figure 3 The portion is bent at the upper right side thereof and extends in a straight line from the bent portion toward the negative direction of the X-axis and the negative direction of the Y-axis respectively.

[0042] In addition, the second cover component 82 extends in the vertical direction. The length of the second cover component 82 in the vertical direction is substantially consistent with the length of the first cover component 81 in the vertical direction. The vertical position of the upper end of the second cover component 82 is substantially consistent with the vertical position of the upper end of the first cover component 81. The vertical position of the lower end of the second cover component 82 is substantially consistent with the vertical position of the lower end of the first cover component 81.

[0043] The first heat insulating space 91 is defined between the outer surface of the motor 70 and the inner surface of the first cover member 81. Figure 2 and Figure 3 In the example, the first heat insulating space 91 is divided between the surface on the positive direction side of the X axis and the surface on the positive direction side of the Y axis among the outer peripheral surfaces of the first cover component 81 and the main body 71 of the motor 70. The first heat insulating space 91 extends in the vertical direction and the circumferential direction. The side surface of the first heat insulating space 91 is divided by the first cover component 81 and the outer peripheral surface of the motor 70. The upper surface of the first heat insulating space 91 is open. The bottom surface of the first heat insulating space 91 is divided by the mounting component 83. Figure 3 As shown, an opening 84 is formed in the mounting member 83. The opening 84 is provided at the central side of the circumferential direction of the portion of the mounting member 83 that contacts the first heat insulating space 91. The first heat insulating space 91 is connected to a space vertically below the mounting member 83 via the opening 84. Therefore, the first heat insulating space 91 is formed to penetrate in the vertical direction.

[0044] The second heat insulating space 92 is divided between the outer surface of the first cover part 81 and the inner surface of the second cover part 82. The surface of the second cover part 82 on the side of the first cover part 81 is the inner surface of the second cover part 82, and the surface of the second cover part 82 on the side opposite to the first cover part 81 is the outer surface of the second cover part 82. Figure 2 and Figure 3In the example, the second heat insulating space 92 is divided between the first cover part 81 and the second cover part 82 in the area other than the area R1 and the area R2 in the circumferential direction. The second heat insulating space 92 extends in the vertical direction and the circumferential direction. The side surface of the second heat insulating space 92 is divided by the first cover part 81 and the second cover part 82. The upper surface and the bottom surface of the second heat insulating space 92 are open. Therefore, the second heat insulating space 92 is formed through in the vertical direction.

[0045] exist Figure 3 In FIG. 1 , the direction toward the heat source relative to the motor 70 is indicated by arrow A1. Figure 3 In the example of , when viewed from above, arrow A1 points in the direction that bisects the angle between the X-axis and the Y-axis. In other words, arrow A1 points in the direction of a vector that combines a unit vector in the positive direction of the X-axis and a unit vector in the positive direction of the Y-axis.

[0046] The thickness T1 of the first heat insulating space 91 is greatest at a position on the heat source side of the motor 70. The thickness T1 corresponds to the distance between the outer peripheral surface of the main body 71 of the motor 70 and the inner surface of the first cover member 81. Figure 3 In FIG. 1 , a position on the heat source side of the motor 70 in the first heat insulating space 91 is represented by a region R3. The thickness T1 at this position is greater than the thickness T1 at surrounding positions.

[0047] On the other hand, the thickness T2 of the second heat insulating space 92 is constant at each position in the circumferential direction. The thickness T2 corresponds to the distance between the outer surface of the first cover member 81 and the inner surface of the second cover member 82. Figure 3 In FIG. 1 , a position on the heat source side of the motor 70 in the second heat insulating space 92 is represented by a region R4. The thickness T2 at this position is consistent with the thickness T2 at other positions.

[0048] As described above, in the supercharger TC, the thickness T1 of the first heat insulating space 91 is maximum at the position on the heat source side relative to the motor 70. As a result, at the position on the heat source side of the motor 70 in the first heat insulating space 91 (i.e., the position represented by the region R3), the air layer with low thermal conductivity can be made thicker, thereby reducing the heat transferred from the first cover member 81 to the motor 70 by heat conduction. In addition, at the position on the heat source side of the motor 70 in the first heat insulating space 91, the heat transferred from the first cover member 81 to the motor 70 by radiation heat transfer can be reduced. Moreover, the flow rate of the air flowing at the position on the heat source side of the motor 70 in the first heat insulating space 91 increases, thereby suppressing the increase in the temperature of the air at this position. Therefore, the motor 70 can be protected from the influence of heat.

[0049] In the above, an example is described in which the first cover part 81 and the second cover part 82 are provided as cover parts for dividing the heat insulating space around the target part, i.e., the motor 70. However, the number of cover parts may be one or more than three. In addition, in the above, an example is described in which the thickness T1 of the first heat insulating space 91 is extremely large at the position on the heat source side relative to the motor 70. However, in the case where the number of heat insulating spaces is multiple, the heat insulating space with extremely large thickness at the position on the heat source side relative to the motor 70 may be any heat insulating space. For example, the thickness T2 of the second heat insulating space 92 may be extremely large at the position on the heat source side relative to the motor 70. Moreover, in the case where the number of heat insulating spaces is multiple, the number of heat insulating spaces with extremely large thickness at the position on the heat source side relative to the motor 70 may be one or more.

[0050] That is, the supercharger TC includes an object component (the motor 70 in the above example) and a heat insulating cover 80 disposed between the object component and the heat source. The heat insulating cover 80 only needs to have at least one cover component (the first cover component 81 and the second cover component 82 in the above example) that divides a heat insulating space around the object component. In addition, it is sufficient that the thickness of at least one heat insulating space (the first heat insulating space 91 in the above example) is extremely large at a position on the heat source side of the object component. Thus, at a position on the heat source side of the object component in the above at least one heat insulating space (the region R3 of the first heat insulating space 91 in the above example), it is possible to reduce the heat transferred from the outside to the object component side through heat conduction and radiation heat transfer. Therefore, the components of the supercharger TC can be protected from the influence of heat.

[0051] In particular, in the above-mentioned example, the cover part that divides the heat-insulating space around the object part includes a first cover part 81 that covers the outer surface of the object part (the motor 70 in the above-mentioned example) and a second cover part 82 that covers the outer surface of the first cover part 81. In addition, the heat-insulating space includes a first heat-insulating space 91 divided between the outer surface of the object part and the inner surface of the first cover part 81 and a second heat-insulating space 92 divided between the outer surface of the first cover part 81 and the inner surface of the second cover part 82. Thus, a double heat-insulating space can be provided for the object part. Therefore, the heat insulation of the object part is improved. Therefore, the components of the supercharger TC can be more effectively protected from the influence of heat.

[0052] In particular, in the above-mentioned example, the first cover component 81 and the second cover component 82 are fixed to each other. Thus, by installing the integrated first cover component 81 and the second cover component 82 on the object component (the motor 70 in the above-mentioned example), a double heat insulation space can be provided for the object component. On the other hand, in the case where the first cover component 81 and the second cover component 82 are not fixed to each other, the first cover component 81 and the second cover component 82 need to be installed on the object component respectively. Therefore, there arise problems such as an increase in the number of components (for example, bolts) for installing the first cover component 81 and the second cover component 82 on the object component, an expansion of the tool path of the tool used for the component, and an increase in the cycle time of the assembly operation. Therefore, by fixing the first cover component 81 and the second cover component 82 to each other, the above-mentioned problems can be eliminated. In addition, by fixing the first cover component 81 and the second cover component 82 to each other, the rigidity of each cover component is geometrically improved.

[0053] In particular, in the above example, the heat-insulating space (the first heat-insulating space 91 and the second heat-insulating space 92 in the above example) is formed through in the vertical direction. Thus, for example, when the supercharger TC is mounted on a mobile body such as a vehicle, the chimney effect of the traveling wind flowing in the horizontal direction can induce the flow of air in the heat-insulating space in the vertical direction. Thus, the air is suppressed from being stagnant in the heat-insulating space, and the temperature rise of the air in the heat-insulating space is suppressed. Therefore, the heat insulation of the target component is improved. Therefore, the components of the supercharger TC can be more effectively protected from the influence of heat.

[0054] In the above, refer to Figure 3 An example of the distribution of the thickness T1 and the thickness T2 has been described. However, the distribution of the thickness T1 and the thickness T2 is not limited to Figure 3 Below, refer to Figures 4 to 6 , the heat shields 80A, 80B, and 80C of the modified examples are described in turn. In each of the modified examples described below, the distribution of the thickness T1 and the thickness T2 is Figure 3 The example is different, but other points are the same as Figure 3 Same as the example.

[0055] Figure 4 FIG. 8 is a top view showing the motor 70 and the heat shield 80A of the first modified example. Figure 4 As shown, in the heat shield 80A of the first modified example, the shape of the first shield member 81 is similar to the above-mentioned Figure 3 Therefore, the distribution of the thickness T1 of the first heat insulating space 91 is the same as that of the above-mentioned Figure 3 Same as the example.

[0056] On the other hand, in the heat shield 80A of the first modified example, Figure 3Specifically, in the second cover member 82 of the heat shield 80A, the curved portion on the central side in the circumferential direction (ie, Figure 4 The upper right part) is larger than the above Figure 3 The example bulges radially outward.

[0057] Therefore, the thickness T2 of the second heat insulating space 92 becomes maximum at a position on the heat source side of the motor 70. Figure 4 As shown, the thickness T2 at a position on the heat source side of the motor 70 (ie, a position indicated by the region R4 ) in the second heat insulating space 92 is greater than the thickness T2 at surrounding positions.

[0058] As described above, in the first modification, the thickness T1 of the first heat insulating space 91 becomes maximum at the position on the heat source side of the motor 70. Figure 3 The same effect as in the example. Moreover, in the first variant, the thickness T2 of the second heat insulating space 92 also becomes maximum at a position on the heat source side relative to the motor 70. Thus, at a position on the heat source side of the motor 70 in the second heat insulating space 92 (i.e., a position represented by region R4), the air layer with low thermal conductivity can be thickened, thereby reducing the heat transferred from the second cover component 82 to the first cover component 81 by heat conduction. In addition, at a position on the heat source side of the motor 70 in the second heat insulating space 92, the heat transferred from the second cover component 82 to the first cover component 81 by radiation heat transfer can be reduced. Moreover, the flow rate of air flowing at a position on the heat source side of the motor 70 in the second heat insulating space 92 increases, thereby suppressing the increase in the temperature of the air at that position. Therefore, the motor 70 can be more effectively protected from the influence of heat.

[0059] Figure 5 FIG. 8 is a top view showing a motor 70 and a heat shield 80B according to a second modification. Figure 5 As shown, in the heat shield 80B of the second modified example, the shape of the second shield member 82 is similar to that of the above-mentioned Figure 3 On the other hand, in the heat shield 80B of the second modified example, the Figure 3 Specifically, in the first cover member 81 of the heat shield 80B, the shape of the first cover member 81 is different from that of the above-mentioned Figure 3 For example, the curved portion on the central side of the circumference (ie, Figure 5 The upper right part) is closer to the motor 70.

[0060] Therefore, the thickness T2 of the second heat insulating space 92 becomes maximum at a position on the heat source side of the motor 70. Figure 5As shown in FIG. 1 , the thickness T2 of the second heat insulating space 92 at a position on the heat source side of the motor 70 (i.e., a position indicated by region R4) is greater than the thickness T2 at surrounding positions. On the other hand, the thickness T1 of the first heat insulating space 91 is maximum at a position on the heat source side of the motor 70 (i.e., a position indicated by region R3), but the thickness T1 at this position is greater than the thickness T2 at the surrounding positions. Figure 3 Examples and Figure 4 The examples are short.

[0061] As described above, in the second modification, the thickness T1 of the first heat insulating space 91 becomes maximum at the position on the heat source side of the motor 70, and the thickness T2 of the second heat insulating space 92 also becomes maximum at the position on the heat source side of the motor 70. Figure 4 However, the thickness T1 of the first heat insulating space 91 at the heat source side of the motor 70 is smaller than Figure 4 The example is short, and thus the thermal insulation effect of the first thermal insulation space 91 is reduced.

[0062] In the above Figure 4 Examples and Figure 5 In the example, the thickness T1 of the first heat insulating space 91 becomes maximum at a position on the heat source side of the motor 70, and the thickness T2 of the second heat insulating space 92 also becomes maximum at a position on the heat source side of the motor 70. However, it is also possible that the thickness T2 of the second heat insulating space 92 becomes maximum at a position on the heat source side of the motor 70, but the thickness T1 of the first heat insulating space 91 is not maximum at a position on the heat source side of the motor 70. In this case, the motor 70 can be protected from the influence of heat by the heat insulation effect of the second heat insulating space 92.

[0063] Figure 6 FIG. 8 is a top view showing a motor 70 and a heat shield 80C according to a third modified example. Figure 6 As shown, in the heat shield 80C of the third modified example, the shape of the first shield member 81 is the same as that of the above-mentioned Figure 3 Therefore, the distribution of the thickness T1 of the first heat insulating space 91 is the same as that of the above-mentioned Figure 3 Same as the example.

[0064] On the other hand, in the heat shield 80C of the third modified example, Figure 3 Specifically, in the second cover member 82 of the heat shield 80C, the shape of the second cover member 82 is different from that of the above-mentioned Figure 3 Compared with the example, the curved portion on the central side of the circumference (ie, Figure 6 The upper right part) is closer to the motor 70.

[0065] Therefore, the thickness T2 of the second heat insulating space 92 becomes extremely small at a position on the heat source side of the motor 70. Specifically, Figure 6 As shown, the thickness T2 at a position on the heat source side of the motor 70 (ie, a position indicated by the region R4 ) in the second heat insulating space 92 is smaller than the thickness T2 at surrounding positions.

[0066] As described above, in the third modification, the thickness T1 of the first heat insulating space 91 becomes maximum at the position on the heat source side of the motor 70. Figure 3 However, the thickness T2 of the second heat insulating space 92 at the heat source side of the motor 70 is greater than Figure 3 The example is short, thereby the thermal insulation effect of the second thermal insulation space 92 is reduced.

[0067] The embodiments of the present disclosure are described above with reference to the accompanying drawings, but the present disclosure is certainly not limited to the embodiments. Obviously, those skilled in the art can think of various changes or modifications within the scope of the scope of the rights protection, and they should certainly be understood to belong to the technical scope of the present disclosure.

[0068] The present disclosure includes the following structures.

[0069] The supercharger disclosed in the present invention is [1] a supercharger comprising: an object component; and a heat insulating cover, which is arranged between the above-mentioned object component and the heat source, and has at least one cover component that divides a heat insulating space around the above-mentioned object component, and the thickness of at least one of the above-mentioned heat insulating spaces becomes maximum at a position on the above-mentioned heat source side relative to the above-mentioned object component.

[0070] The supercharger disclosed in the present invention may also be [2], according to the supercharger described in [1], wherein the above-mentioned cover component includes a first cover component covering the outer surface of the above-mentioned object component and a second cover component covering the outer surface of the above-mentioned first cover component, and the above-mentioned insulation space includes: a first insulation space divided between the outer surface of the above-mentioned object component and the inner surface of the above-mentioned first cover component; and a second insulation space divided between the outer surface of the above-mentioned first cover component and the inner surface of the above-mentioned second cover component.

[0071] The supercharger of the present invention may be [3] the supercharger according to [2], wherein the thickness of the first heat insulating space becomes maximum at a position on the heat source side relative to the target component.

[0072] The supercharger of the present disclosure may be [4], the supercharger according to [2] or [3], wherein the thickness of the second heat insulating space becomes maximum at a position on the heat source side relative to the target component.

[0073] The supercharger of the present invention may be [5], the supercharger according to any one of [2] to [4], wherein the first cover member and the second cover member are fixed to each other.

[0074] The supercharger of the present invention may be [6], the supercharger according to any one of [1] to [5], wherein the heat insulating space is formed to penetrate in the vertical direction.

[0075] Explanation of symbols

[0076] 70 - motor (target component), 80 - heat insulation cover, 80A - heat insulation cover, 80B - heat insulation cover, 80C - heat insulation cover, 81 - first cover component, 82 - second cover component, 91 - first heat insulation space, 92 - second heat insulation space, TC - supercharger.

Claims

1. A supercharger, characterized in that: have: object parts; and The heat insulating cover is provided between the target component and the heat source, and has at least one cover member that defines a heat insulating space around the target component, wherein the thickness of the at least one heat insulating space becomes maximum at a position on the heat source side relative to the target component.

2. The supercharger according to claim 1, characterized in that: The cover member includes a first cover member covering an outer surface of the target member and a second cover member covering an outer surface of the first cover member. The heat-insulating space includes: a first heat-insulating space defined between an outer surface of the target component and an inner surface of the first cover component; and a second heat-insulating space defined between an outer surface of the first cover component and an inner surface of the second cover component.

3. The supercharger according to claim 2, characterized in that: The thickness of the first heat insulating space becomes maximum at a position on the heat source side relative to the counterpart member.

4. The supercharger according to claim 2 or 3, characterized in that: The thickness of the second heat insulating space becomes maximum at a position on the heat source side relative to the counterpart member.

5. The supercharger according to claim 2, characterized in that: The first cover member and the second cover member are fixed to each other.

6. The supercharger according to claim 1, characterized in that: The heat insulating space is formed to penetrate in the vertical direction.

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