Silencer and supercharger

Abstract

To provide a silencer and a supercharger that can be upsized.SOLUTION: A silencer is fitted to a suction port side of a compressor of a supercharger, and includes: a cylindrical part having a shaft in a rotary axial direction of a compressor impeller; a lid part fitted to an end of the cylindrical part where an opening is formed; an inner frame which includes a curved wall part protruding in the rotary axial direction from a base end side of the cylindrical part to the lid part at the base end side inside the cylindrical part and in which an air supply port is formed; and a baffle plate which is located between the lid part and the inner frame in the cylindrical part and where a through hole is formed. An outer end of the baffle plate is fixed to the cylindrical part, and a length along the rotation axis to an opening formed on a base end part of the cylindrical part from the outer end of the baffle plate is shorter than a length along the rotation axis from an inner end of the baffle plate to the opening formed in the base end part of the cylindrical part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a silencer and a turbocharger. [Background technology]

[0002] Patent Document 1 discloses a technique related to a silencer. This silencer includes a housing having a cylindrical portion and a lid portion, a curved wall portion protruding from the periphery of a gas supply port inside the housing toward the lid portion, and a baffle plate provided in a space surrounded by the cylindrical portion, the lid portion, and the curved wall portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-210946 Summary of the Invention [Problem to be solved by the invention]

[0004] The silencer may have a mounting portion made of sheet metal interposed between the cylindrical portion and the compressor. Even if the silencer is enlarged to accommodate an enlarged compressor, the thickness of the metal plate for the mounting portion may not be adjustable due to processability considerations. In this case, the vibration resistance of the mounting portion to compressor vibrations caused by the engine is reduced, which may cause the silencer to vibrate significantly due to compressor vibrations caused by the engine, potentially damaging at least a portion of the silencer.

[0005] The present disclosure describes a silencer and supercharger that can be scaled up. [Means for solving the problem]

[0006] A silencer according to one embodiment of the present disclosure is a silencer attached to the intake side of a compressor of a turbocharger, and comprises: a cylindrical portion having an axis in the direction of the rotational axis of the compressor impeller; a lid portion attached to the tip of the cylindrical portion in which an opening is formed; an inner frame including a curved wall portion at the base end side inside the cylindrical portion that is curved so as to protrude in the direction of the rotational axis from the base end side of the cylindrical portion toward the lid portion, and in which an air supply port is formed; and a baffle plate located between the lid portion and the inner frame within the cylindrical portion and in which a through hole is formed, the outer end of the baffle plate being fixed to the cylindrical portion, and the length along the rotational axis from the outer end of the baffle plate to the opening formed at the base end of the cylindrical portion being shorter than the length along the rotational axis from the inner end of the baffle plate to the opening formed at the base end of the cylindrical portion.

[0007] In the silencer of the present disclosure, the baffle plate is fixed to the base end of the cylindrical portion, compared to when the length along the rotation axis from the outer end of the baffle plate to the opening on the base end of the cylindrical portion is equal to or greater than the length along the rotation axis from the inner end of the baffle plate to the opening on the base end of the cylindrical portion. That is, the baffle plate is fixed at a location closer to the mounting portion. This reduces the amplitude of the baffle plate caused by compressor vibrations, which originate from the engine, and reduces the force applied to the baffle plate and the cylindrical portion, thereby suppressing damage to the baffle plate and the cylindrical portion. As a result, the silencer can be made larger.

[0008] In some embodiments, the cylindrical portion has an inlet opening that communicates the interior of the cylindrical portion with the exterior of the cylindrical portion, and the baffle plate may have an inclined portion extending from the outer end fixed to the cylindrical portion toward the lid portion in a direction intersecting the rotation axis, and a curved tip portion that curves so as to protrude from the tip of the inclined portion toward the lid portion in the direction of the rotation axis and has an opening centered on the rotation axis. In this case, the opening formed in the curved tip portion appropriately ensures a flow path through which gas passing between the lid portion and the baffle plate from the inlet opening of the cylindrical portion can flow to the air supply port of the inner frame.

[0009] In some embodiments, the cylindrical portion has an intake opening that connects the interior of the cylindrical portion to the exterior of the cylindrical portion, and at least a portion of the baffle plate may extend along the inner frame. In this case, a flow path is appropriately secured through which gas passing from the intake opening of the cylindrical portion between the inner frame and the baffle plate can flow to the air supply port of the inner frame. By having at least a portion of the baffle plate extend along the inner frame, the flow path width (cross-sectional area of ​​the flow path) can be made constant, making it less likely that pressure loss will occur.

[0010] In some embodiments, the device further includes a plate-like member having a first portion fixed to the baffle plate and extending along at least a portion of the baffle plate, and a second portion fixed to the inner surface of the cylindrical portion and extending along the inner surface, and the angle formed between the extending direction of the first portion and the extending direction of the second portion on the base end side and the rotation axis side may be an obtuse angle. In this case, stress concentration at the intersection of the first portion and the second portion can be reduced compared to when the extending direction of the first portion and the extending direction of the second portion are at a right angle. This can suppress damage to the plate-like member.

[0011] In some embodiments, the baffle plate may include sound-absorbing material, which can reduce the noise associated with driving the compressor.

[0012] In some embodiments, the silencer may further include a mounting portion having a bottom portion facing the compressor and fixed to the compressor, and a wall portion extending from the outer end of the bottom portion along the rotational axis direction, at least a portion of which can be accommodated within the cylindrical portion. In this case, providing the wall portion at the outer end of the bottom portion of the mounting portion allows not only the bottom portion but also the wall portion to resist radial forces generated by vibrations of the compressor and silencer (the vibration source of which is the engine), thereby increasing the durability of the mounting portion. This reduces damage to the mounting portion. As a result, the silencer can be made larger.

[0013] In some aspects, the thickness of the wall of the mounting portion in the radial direction of rotation may be greater than the thickness of the bottom portion in the axial direction of rotation. Since the thickness of the wall of the mounting portion in the radial direction of rotation is greater than the thickness of the bottom portion along the axial direction of rotation, it is possible to increase the vibration resistance of the wall portion against radial forces generated by vibration of the compressor and the silencer.

[0014] In some embodiments, the mounting portion has an attachment portion that protrudes radially outward from the wall portion, and the housing attached to the attachment portion and the wall portion of the mounting portion may be spaced apart in the radial direction. By spaced apart in the radial direction between the housing and the wall portion of the mounting portion, friction between the wall portion of the mounting portion and the housing can be reduced, allowing the housing and the wall portion of the mounting portion to be smoothly fitted together.

[0015] A silencer according to one embodiment of the present disclosure is a silencer attached to the intake side of a compressor of a turbocharger, and includes: a cylindrical portion having an axis in the direction of the rotational axis of the compressor impeller; a lid portion attached to the tip of the cylindrical portion in which an opening is formed; an inner frame including a curved wall portion curved at the base end side inside the cylindrical portion so as to protrude in the direction of the rotational axis from the base end side of the cylindrical portion toward the lid portion and in which an air supply port is formed; a baffle plate located between the lid portion and the inner frame within the cylindrical portion and in which a through hole is formed; a bottom portion facing the compressor and fixed to the compressor; and an installation portion having a wall portion extending from the outer end of the bottom along the direction of the rotational axis and capable of being accommodated within the cylindrical portion.

[0016] In the silencer of the present disclosure, the wall portion is provided at the outer end of the bottom of the mounting portion, so that not only the bottom but also the wall portion can resist radial forces generated by vibrations of the compressor and silencer, thereby increasing the durability of the mounting portion. This reduces damage to the mounting portion. As a result, the silencer can be made larger.

[0017] A turbocharger according to an embodiment of the present disclosure includes any one of the silencers described above. Because the turbocharger includes any one of the silencers described above, it is possible to increase the size of the turbocharger, as described above. [Effects of the Invention]

[0018] According to some aspects of the present disclosure, a silencer and a turbocharger that can be increased in size are provided. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a cross-sectional view showing a turbocharger equipped with a silencer according to one embodiment. [Figure 2] FIG. 2 is another cross-sectional view showing a portion of a silencer according to an embodiment. [Figure 3] FIG. 3 is a perspective view of a baffle plate and a plate-like member included in a silencer according to one embodiment, as viewed from the base end side. [Figure 4] FIG. 4 is a perspective view of a baffle plate and a plate-like member included in a silencer according to one embodiment, viewed from the tip side. [Figure 5] FIG. 5 is a perspective view of an installation portion included in a silencer according to one embodiment, as viewed from the tip side. [Figure 6] FIG. 6 is a cross-sectional view showing a part of the silencer shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment will be described below with reference to the drawings. In the description of the drawings, identical or corresponding elements are denoted by the same reference numerals, and redundant description may be omitted.

[0021] FIG. 1 is a cross-sectional view showing a turbocharger 1 equipped with a silencer 4 according to one embodiment. FIG. 2 is another cross-sectional view showing a turbocharger equipped with a silencer according to one embodiment. FIGS. 1 and 2 are cross-sectional views including a rotational axis H of the turbocharger 1. The turbocharger 1 is applied to an internal combustion engine of a ship or a vehicle, for example. As shown in FIGS. 1 and 2, the turbocharger 1 includes a turbine 2, a compressor 3, and a silencer 4. The turbine 2 includes a turbine housing 21 and a turbine wheel 22 housed in the turbine housing 21. The turbine housing 21 has a scroll passage 23 extending in the circumferential direction around the turbine wheel 22. The compressor 3 includes a compressor housing 31 and a compressor wheel 32 housed in the compressor housing 31. The compressor housing 31 has a scroll passage 33 extending in the circumferential direction around the compressor wheel 32.

[0022] The turbine wheel 22 is provided at one end of the rotating shaft 11. The compressor wheel 32 is provided at the other end of the rotating shaft 11. A bearing housing 13 is provided between the turbine housing 21 and the compressor housing 31. The rotating shaft 11 is rotatably supported by the bearing housing 13 via a bearing 12. The rotating shaft 11, the turbine wheel 22, and the compressor wheel 32 rotate around the rotation axis H as an integrated rotating body 14.

[0023] The turbine housing 21 is provided with an exhaust gas inlet (not shown) and an exhaust gas outlet 25. Exhaust gas discharged from the internal combustion engine flows into the turbine housing 21 through the exhaust gas inlet. The exhaust gas then flows into the turbine wheel 22 through the scroll passage 23. The exhaust gas then rotates the turbine wheel 22. The exhaust gas then flows out of the turbine housing 21 through the exhaust gas outlet 25.

[0024] The compressor housing 31 is provided with an intake port 34 and a discharge port (not shown). When the turbine wheel 22 rotates as described above, the compressor wheel 32 rotates via the rotary shaft 11. The rotating compressor wheel 32 draws in external air through the intake port 34. This air passes through the compressor wheel 32 and the scroll passage 33 and is compressed, and then is discharged from the discharge port. The compressed air discharged from the discharge port is supplied to the internal combustion engine described above.

[0025] The silencer 4 is attached to the intake port 34 of the compressor 3. In the following description, the terms "axial direction," "radial direction," and "circumferential direction" simply refer to the direction of the rotational axis of the turbine wheel 22 (direction of the rotational axis H), the rotational radial direction, and the rotational circumferential direction, respectively. In the direction of the rotational axis H, the compressor 3 side of the turbocharger 1 (right side in FIG. 1) may be simply referred to as the "base end side." The side of the silencer 4 that is a lid portion 43 (described below) (left side in FIG. 1) may be simply referred to as the "tip side." In the rotational radial direction, the rotational axis H side of the silencer 4 may be simply referred to as the "inner side." The direction away from the rotational axis H of the silencer 4 may be simply referred to as the "outer side."

[0026] Air supplied to the compressor 3 from the outside is drawn into the intake port 34 of the compressor 3 via the silencer 4. The silencer 4 reduces the noise generated by the compressor impeller 32 that is emitted to the outside. The silencer 4 is of the so-called "reverse type" type, and is provided with a portion that protrudes axially around the air outlet inside the cylindrical portion described below and reverses the flow of gas. While FIG. 1 shows a cross-sectional view of the silencer 4, the silencer 4 has a three-dimensional shape of a body of revolution formed by rotating the cross-section shown in FIG. 1 around the rotation axis H. For example, the silencer 4 has a circular shape when viewed parallel to the rotation axis H.

[0027] The silencer 4 includes a housing 40, a baffle plate 50, at least one plate-like member 60, at least one fixing portion 70, and an installation portion 80.

[0028] The housing 40 is attached to the compressor 3 via a mounting portion 80. The housing 40 has a cylindrical shape with a lid portion and a bottom portion. An internal space R is formed inside the housing 40, which can accommodate the baffle plate 50, at least one plate-like member 60, and at least one fixing portion 70. The housing 40 includes a cylindrical portion 41, a lid portion 43, and an inner frame 44.

[0029] The cylindrical portion 41 is an outer frame having an axis in the axial direction of the compressor impeller 32. The cylindrical portion 41 has, for example, a cylindrical shape. The silencer 4 is attached to the compressor housing 31 so that the cylindrical axis of the cylindrical portion 41 and the rotation axis H are substantially aligned. At least one suction opening 41a is formed on the circumferential surface of the cylindrical portion 41, connecting the interior of the cylindrical portion 41 with the exterior of the cylindrical portion 41. In the example shown in FIG. 1, multiple suction openings 41a are formed in the cylindrical portion 41. For example, the cylindrical portion 41 is made of a metal plate (e.g., punched metal) that is permeable to air. This allows air from the outside to be introduced radially through the multiple suction openings 41a formed on the circumferential surface of the cylindrical portion 41. The air from the outside passes radially through the multiple suction openings 41a and is introduced into the interior of the cylindrical portion 41.

[0030] An opening 41c is formed in a distal end portion 41b, which is the end portion on the distal end side of the cylindrical portion 41. An opening 41e is formed in a proximal end portion 41d, which is the end portion on the proximal end side of the cylindrical portion 41. The lid portion 43 is attached to the distal end portion 41b of the cylindrical portion 41. The lid portion 43 has a top plate that covers the opening 41c. Note that the lid portion 43 includes, for example, a structure that does not allow air to pass through.

[0031] The inner frame 44 is attached to the base end 41d of the cylindrical portion 41. The inner frame 44 is formed, for example, from a curved metal plate (for example, an aluminum plate). The inner frame 44 has an air supply wall portion 45 that forms the air supply port 44a, a curved wall portion 46 that curves so as to protrude in the axial direction from the base end side of the cylindrical portion 41 toward the lid portion 43, and a bottom wall portion 47 that is provided on the installation portion 80.

[0032] The air supply wall 45 has a cylindrical shape. An air supply port 44a is formed in the housing 40 at a position opposite the lid 43. The air supply wall 45 is made of a metal plate (e.g., punched metal) that has a structure that allows air to pass through. The air supply port 44a has a circular shape centered on the rotation axis H, and is connected to the intake port 34 of the compressor 3. Air introduced from the outside passes through the air supply port 44a and moves to the compressor 3.

[0033] The curved wall portion 46 extends radially from the position of the suction opening 41a toward the inner surface 42 of the cylindrical portion 41. An inner end 46a on the radially inner side of the curved wall portion 46 protrudes distally from the distal end of the air supply wall portion 45. An outer end 46b on the radially outer side of the curved wall portion 46 is attached to the inner surface 42 on the base end side of the cylindrical portion 41. The curved wall portion 46 protrudes toward the lid portion 43 and extends in a direction intersecting with the rotation axis H. For example, a peak 46c of the curved wall portion 46 in the axial direction is located closer to the lid portion 43 than the proximal end 41d of the cylindrical portion 41 and the distal end of the air supply wall portion 45. Note that a sound-absorbing material may be attached to the distal surface of the curved wall portion 46 to absorb sound leakage from inside the silencer 4 to the outside of the silencer 4.

[0034] The bottom wall portion 47 is provided on the base end side of the curved wall portion 46. The bottom wall portion 47 extends radially from the position of the suction opening portion 41a toward the inner surface 42 of the tubular portion 41. A radially inner end portion 47a of the bottom wall portion 47 extends continuously from the base end portion of the air supply wall portion 45. A radially outer end portion 47b of the bottom wall portion 47 is attached to the inner surface 42 on the base end side of the tubular portion 41. The bottom wall portion 47 has a radially inner end portion extending along the radial direction and a radially outer end portion fixed to the inner surface 42 of the tubular portion 41 and extending in the axial direction.

[0035] Next, the configuration of the baffle plate 50 will be described. FIG. 3 is a perspective view of the baffle plate and plate-shaped members included in the silencer according to one embodiment, as viewed from the base end side. FIG. 4 is a perspective view of the baffle plate and plate-shaped members included in the silencer according to one embodiment, as viewed from the tip end side. The baffle plate 50 shown in FIGS. 2 to 4 reduces noise. The baffle plate 50 includes a sound-absorbing material. An example of the sound-absorbing material is wool felt. The baffle plate 50 is an umbrella-shaped member having an opening centered on the rotation axis H. The baffle plate 50 is disposed within the cylindrical portion 41, between the cover portion 43 and the inner frame 44. When viewed from the rotation axis H, the baffle plate 50 has a circular shape. At least a portion of the baffle plate 50 extends along the inner frame 44. For example, the baffle plate 50 extends along at least a portion of the inner frame 44. As a result, the axial length between the inner frame 44 and the baffle plate 50 is constant in at least a portion of the region where the inner frame 44 and the baffle plate 50 overlap when viewed in the axial direction.

[0036] The baffle plate 50 has an inclined portion 51 and a curved tip portion 52. The inclined portion 51 extends from an outer end portion 51a fixed to the cylindrical portion 41 toward the lid portion 43 in a direction intersecting the rotation axis H. The outer end portion 51a of the inclined portion 51 is the outer end of the baffle plate 50 and is disposed near the inner surface 42 of the cylindrical portion 41. The tip portion 51b of the inclined portion 51 is located more distal and inward than the outer end portion 51a of the inclined portion 51. The inclined portion 51 extends along a portion of the curved wall portion 46 that extends toward the lid portion 43 in a direction intersecting the rotation axis H.

[0037] The tip curved portion 52 is curved so as to protrude in the axial direction from the tip portion 51b of the inclined portion 51 toward the lid portion 43. A peak 52a in the axial direction of the tip curved portion 52 is located closer to the air supply wall portion 45 than the tubular portion 41. For example, in the axial direction, the peak 52a of the tip curved portion 52 is located on the tip side of the peak 46c of the curved wall portion 46. For example, in the radial direction, the peak 52a of the tip curved portion 52 is located at the same position as the peak 46c of the curved wall portion 46. The position of the peak 52a of the tip curved portion 52 is the position where the axial length between the lid portion 43 and the baffle plate 50 is narrowest. The inclined portion 51 and the tip curved portion 52 of the baffle plate 50 are provided with openings (not shown) through which the insertion portions of the male screws 71 of the fixing portion 70 can be inserted.

[0038] A through hole 52c is formed by the inner end 52b of the distal curved portion 52, with the center at the rotation axis H. The through hole 52c is a circular opening when viewed from the rotation axis H. For example, the through hole 52c is located on the distal side of the air supply port 44a in the axial direction. For example, the through hole 52c is located on the proximal side of the peak 52a of the distal curved portion 52 in the axial direction. For example, the center of the through hole 52c is located at the same position as the center of the air supply port 44a in the radial direction. For example, the inner end 52b forming the through hole 52c may be located inside the peak 46c of the curved wall portion 46 of the inner frame 44 and at the same position as the air supply wall portion 45 of the inner frame 44 in the radial direction. Note that the inner end 52b forming the through hole 52c may be located inside the peak 46c of the curved wall portion 46 of the inner frame 44 and outside the air supply wall portion 45 of the inner frame 44 in the radial direction. That is, the through-hole 52c may be larger than the air supply port 44a.

[0039] The length L51 along the rotation axis H from the outer end 51a of the baffle plate 50 to the air supply port 44a is shorter than the length L52 along the rotation axis H from the inner end 52b of the baffle plate 50 to the air supply port 44a. The length L51 refers to, for example, the length along the rotation axis H from the base-end edge 51c of the outer end 51a of the inclined portion 51 of the baffle plate 50 to the base-end edge 45a of the air supply wall portion 45 that forms the air supply port 44a. The length L52 refers to, for example, the length along the rotation axis H from the base-end edge 52d of the inner end 52b of the tip curved portion 52 of the baffle plate 50 to the base-end edge 45a of the air supply wall portion 45 that forms the air supply port 44a. The length L51 may be, for example, the length along the rotation axis H from the tip edge of the outer end 51a of the inclined portion 51 of the baffle plate 50 to the tip edge 45a of the air supply wall portion 45 that forms the air supply port 44a. In this case, the length L52 may be, for example, the length along the rotation axis H from the tip edge of the inner end 52b of the tip curved portion 52 of the baffle plate 50 to the tip edge 45a of the air supply wall portion 45 that forms the air supply port 44a.

[0040] The silencer 4 defines an internal space R surrounded by the cylindrical portion 41, the lid portion 43, and the inner frame 44. In the silencer 4, air from the outside is introduced radially inward into the internal space R through the multiple suction openings 41a of the cylindrical portion 41, and gas that passes through the internal space R is delivered axially toward the compressor 3. The baffle plate 50 is disposed between the distal end 41b and the proximal end 41d of the cylindrical portion 41. The baffle plate 50 is disposed such that multiple suction openings 41a are located on both the distal end and proximal end of the baffle plate 50. Gas that flows into the internal space R from the multiple suction openings 41a located between the outer end 46b of the curved wall portion 46 of the inner frame 44 and the outer end 51a of the baffle plate 50 in the axial direction passes between the inner frame 44 and the baffle plate 50, reverses its axial flow direction, and moves to the air supply port 44a. In addition, gas flowing into the internal space R from multiple suction openings 41a located between the outer end of the lid portion 43 and the outer end 51a of the baffle plate 50 in the axial direction passes between the lid portion 43 and the baffle plate 50, reverses its flow direction in the axial direction, passes through the through hole 52c formed in the baffle plate 50, and moves to the air supply port 44a.

[0041] Next, the configuration of at least one plate-shaped member 60 and the fixing portion 70 will be described. The silencer 4 of this embodiment has a plurality of plate-shaped members 60. The plurality of plate-shaped members 60 are intervening members for fixing the cylindrical portion 41 and the baffle plate 50. The plurality of plate-shaped members 60 are fixed to the baffle plate 50. The plurality of plate-shaped members 60 are fixed to the surface of the base end side of the baffle plate 50. Each of the plurality of plate-shaped members 60 is arranged with intervals in the circumferential direction. Each of the plurality of plate-shaped members 60 has a strip shape. The plurality of plate-shaped members 60 is a bracket. Each of the plurality of plate-shaped members 60 is made of metal.

[0042] Each of the plurality of plate-like members 60 has a first portion 61 extending along at least a portion of the baffle plate 50 and a second portion 62 fixed to the inner surface 42 of the cylindrical portion 41 and extending along the inner surface 42. The first portion 61 extends radially along the inclined portion 51 and the distal curved portion 52. The outer end of the first portion 61 and the distal end of the second portion 62 are curved and connected. The first portion 61 and the second portion 62 of the plate-like member 60 are provided with a plurality of openings (not shown) through which insertion portions of male screws 71 (described below) of the fixing portion 70 can be inserted. The angle formed by the extending direction of the first portion 61 and the extending direction of the second portion 62 on the proximal and inner sides is an obtuse angle. As a result, the baffle plate 50 fixed along the plate-like member 60 is supported in a state inclined toward the lid portion 43 in a direction intersecting the rotation axis H. The silencer 4 may have at least one plate-like member in the first section 61 that does not have a portion that is aligned with the curved tip section 52. The first section of the plate-like member has at least a portion that is aligned with the inclined section 51.

[0043] The fixing portion 70 is used to fix the baffle plate 50 to the plate-like member 60, the housing 40 to the plate-like member 60, and the housing 40 to the installation portion 80. For example, the fixing portion 70 includes a fastener. For example, the fixing portion 70 includes a plurality of male screws 71 and a plurality of female screws 72. The male screws 71 are, for example, bolts having a threaded insertion portion and a head portion with a larger diameter than the threaded insertion portion. The female screws 72 are, for example, nuts. Each male screw 71 is inserted into an opening provided in the multiple target components to be fixed, and is threadedly engaged with each female screw 72. The multiple target components are fixed by being clamped between the male screws 71 and the female screws 72.

[0044] Each of the multiple male screws 71 is inserted through each of the multiple openings provided in the baffle plate 50 and the multiple openings provided in the first portions 61 of the multiple plate-like members 60, and is threadedly engaged with the multiple female screws 72. For example, each of the multiple male screws 71 is inserted toward the tip end, first through the opening provided in the first portion 61 of the plate-like member 60, and then through the opening provided in the baffle plate 50. Each of the multiple female screws 72 is threadedly engaged with a corresponding one of the multiple male screws 71, toward the tip end surface of the baffle plate 50. A washer may be provided between each of the multiple female screws 72 and the baffle plate 50. As a result, the baffle plate 50 and the multiple plate-like members 60 are clamped between the male screws 71 and the female screws 72, and thereby fixed.

[0045] Furthermore, each of the multiple male screws 71 is inserted through each of the multiple openings provided in the cylindrical portion 41 and the multiple openings provided in the second portions 62 of the plate-like members 60, and threadedly engages with the multiple female screws 72. For example, each of the multiple male screws 71 is inserted inwardly through the opening provided in the cylindrical portion 41 and then through the opening provided in the second portion 62 of the plate-like member 60. Each of the multiple female screws 72 threads toward the inner surface of the plate-like member 60. A washer may be provided between each of the multiple female screws 72 and the plate-like member 60. As a result, the cylindrical portion 41 and the multiple plate-like members 60 are fixed by being sandwiched between the male screws 71 and the female screws 72. Furthermore, the cylindrical portion 41 and the baffle plate 50 are fixed by the multiple plate-like members 60 and the fixing portion 70.

[0046] Next, the configuration of the mounting part 80 will be described. The mounting part 80 shown in FIG. 1 is a member interposed to fix the housing 40 and the compressor 3. The mounting part 80 is located between the housing 40 and the compressor 3 in the axial direction. The mounting part 80 is attached to the compressor 3 and also to the inner surface 42 of the cylindrical part 41 of the housing 40. The mounting part 80 is, for example, a casting. The mounting part 80 does not have to be made of sheet metal. FIG. 5 is a perspective view of a mounting part included in a silencer according to one embodiment, as seen from the tip side. FIG. 6 is a cross-sectional view showing a portion of the silencer shown in FIG. 1. The mounting part 80 shown in FIGS. 2, 5, and 6 has a bottom part 81, a wall part 82, and at least one mounting part 83.

[0047] The bottom 81 faces the compressor 3 and is fixed to the compressor 3. The bottom 81 extends in the radial direction. The bottom 81 has an annular shape. An air supply port 81a is formed in the bottom 81, the air supply port 81a being centered on the rotation axis H. For example, the size of the air supply port 81a is the same as the size of the air supply port 44a formed by the inner frame 44. The housing 40 and the mounting part 80 are arranged so that the position of the air supply port 44a of the inner frame 44 coincides with the position of the air supply port 81a in the radial direction. A part of the bottom 81 may be in contact with the bottom wall part 47 of the inner frame 44. An outer end part 81b of the bottom 81 is located inside the inner surface 42 of the cylindrical part 41 in the radial direction.

[0048] The wall portion 82 extends in the axial direction from the outer end portion 81b of the bottom portion 81. The wall portion 82 has a cylindrical shape. At least a portion of the wall portion 82 can be accommodated within the tubular portion 41. For example, when the housing 40 and the mounting portion 80 are fixed, at least the upper portion of the wall portion 82 is accommodated within the tubular portion 41. Being accommodated means that the base end of the tubular portion 41 is located closer to the base end than the tip end of the wall portion 82 in the axial direction, and that at least the upper portion of the wall portion 82 is located inside the tubular portion 41 in the radial direction.

[0049] As shown in Fig. 6, the wall portion 82 has a sufficient thickness to withstand vibrations of the compressor 3, the vibration source of which is the engine. For example, the wall portion 82 has a sufficient thickness so that the wall portion 82 does not vibrate much even when a radial force is applied due to the vibration of the compressor 3, the vibration source of which is the engine. For example, the radial thickness L82 of the wall portion 82 is greater than the axial thickness L81 of the bottom portion 81. Note that the radial extension length of the bottom portion 81 is greater than the axial thickness, and therefore the bottom portion 81 can sufficiently withstand even when a radial force is applied due to the vibration of the compressor 3, the vibration source of which is the engine.

[0050] As shown in FIGS. 2, 5, and 6, the installation portion 80 of this embodiment has a plurality of mounting portions 83. The plurality of mounting portions 83 are locations to which the cylindrical portion 41 of the housing 40 is attached. The mounting portions 83 have protruding portions 84 and reinforcing portions 85. The protruding portions 84 protrude radially outward from the wall portion 82. The protruding portions 84 face the inner surface 42 of the cylindrical portion 41 and have a contactable surface 84a. The reinforcing portions 85 protrude radially inward from the wall portion 82. The reinforcing portions 85 are integrated with the bottom portion 81 and the wall portion 82 and reinforce the bottom portion 81 and the wall portion 82. The reinforcing portions 85 can, for example, suppress vibration of the wall portion 82 relative to the bottom portion 81.

[0051] As shown in FIG. 2 , the wall portion 82, the protruding portion 84, and the reinforcing portion 85, on which the multiple mounting portions 83 are provided, each have a threaded opening 83a formed therein so as to be able to threadably engage with the insertion portion of the male screw 71. The multiple male screws 71 are inserted sequentially from the outside to the inside of the tubular portion 41 through openings provided in the tubular portion 41, the outer end portion 46b of the curved wall portion 46 of the inner frame 44, and the outer end portion 47b of the bottom wall portion 47 of the inner frame 44, respectively, and are threadedly engaged with the protruding portion 84, the wall portion 82, and the reinforcing portion 85. As a result, the tubular portion 41 and the inner frame 44 are sandwiched and fixed between the heads of the multiple male screws 71 and the multiple mounting portions 83 of the installation portion 80. Note that, as shown in FIG. 6 , a portion of the tubular portion 41 and a portion of the inner frame 44 may not be fixed together with the mounting portions 83 of the installation portion 80, and there may be portions where only the tubular portion 41 and the inner frame 44 are fixed by the fixing portion 70.

[0052] When the cylindrical portion 41 and the mounting portion 80 are fixed, the cylindrical portion 41 attached to the attachment portion 83 and the wall portion 82 of the mounting portion 80 are spaced apart in the radial direction. Specifically, a radial length L84 between the inner surface 42 of the cylindrical portion 41 attached to the attachment portion 83 and the outer wall surface 82a of the wall portion 82 of the mounting portion 80 is greater than 0. Note that when the cylindrical portion 41, the inner frame 44, and the attachment portion 83 of the mounting portion 80 are fixed, the radially inner surface of the bottom wall portion 47 of the inner frame 44 and the outer wall surface 82a of the wall portion 82 of the mounting portion 80 are spaced apart. For example, the radially inner surface of the bottom wall portion 47 of the inner frame 44 and the outer wall surface 82a of the wall portion 82 of the mounting portion 80 are spaced apart by at least the height of the female thread 72 of the fixing portion 70 (the length along the radial direction in FIG. 6 ).

[0053] Next, the effects achieved by the silencer 4 and the turbocharger 1 according to this embodiment will be described together with the problems of the related art.

[0054] In the first place, silencers vibrate because they are installed near the engine or connected to the compressor, for example. When the engine and compressor are enlarged and their output increases, the silencer may vibrate significantly due to the large vibrations caused by the engine and compressor operating.

[0055] Furthermore, silencers may have a mounting section made of sheet metal interposed between the housing and the compressor. Even if the silencer is enlarged to accommodate an enlarged compressor, the thickness of the metal plate for the mounting section may not be able to be changed due to processability considerations. Even if the silencer housing and compressor are enlarged, if the thickness of the metal plate for the mounting section is not changed, the vibration resistance of the mounting section against the above-mentioned vibrations will decrease. This may cause the silencer to vibrate significantly.

[0056] These factors may cause the silencer to vibrate significantly, which may result in fatigue or damage to at least a portion of the silencer. Examples of components and parts that may be fatigued or damaged by silencer vibration include the housing, the baffle plate, the mounting part, the part used to fasten the housing and the baffle plate, and the part used to fasten the housing and the mounting part. In order to suppress fatigue and damage to the components that make up the silencer due to vibration, there has been a demand for a configuration that suppresses stress concentration on at least some of the above-mentioned components and parts that may be fatigued or damaged, and a configuration that improves the vibration resistance of the mounting part.

[0057] In contrast, in the silencer 4 and the turbocharger 1 of the present embodiment, a length L51 along the rotation axis H from the outer end 51a of the baffle plate 50 to the opening 41e formed in the base end 41d of the cylindrical portion 41 is shorter than a length L52 along the rotation axis H from the inner end 52b of the baffle plate 50 to the opening 41e of the cylindrical portion 41. In this case, the baffle plate 50 is fixed to the base end side of the cylindrical portion 41 in the silencer 4, compared to a case where the length L51 along the rotation axis H from the outer end 51a of the baffle plate 50 to the opening 41e of the cylindrical portion 41 is equal to or longer than the length L52 along the rotation axis H from the inner end 52b of the baffle plate 50 to the opening 41e of the cylindrical portion 41. That is, the baffle plate 50 is fixed to a location that is closer to the engine or the compressor 3 (or the installation portion 80), which is a source of vibration. This reduces the amplitude of the baffle plate 50 caused by vibration of the compressor 3, which has the engine as its vibration source, and reduces the force applied to the baffle plate 50 and the cylindrical portion 41, thereby suppressing damage to the baffle plate 50 and the cylindrical portion 41. As a result, it becomes possible to increase the size of the silencer 4 and the turbocharger 1 including the silencer 4.

[0058] In this embodiment, through holes 52c are formed in the tip curved portion 52 of the baffle plate 50, thereby appropriately ensuring a flow path through which gas passing from the multiple suction openings 41a of the cylindrical portion 41 between the cover portion 43 and the baffle plate 50 can flow to the air supply port 44a of the inner frame 44. The gas passes through the through holes 52c, moves to the base end side of the baffle plate 50, and moves to the compressor 3 via the air supply port 44a formed in the inner frame 44.

[0059] In this embodiment, at least a portion of the baffle plate 50 extends along the inner frame 44, thereby ensuring an appropriate flow path through which gas passing from the multiple suction openings 41a of the cylindrical portion 41 between the inner frame 44 and the baffle plate 50 can flow to the air supply ports 44a of the inner frame 44. Since at least a portion of the baffle plate 50 extends along the inner frame 44, the flow path width (cross-sectional area of ​​the flow path) between the inner frame 44 and the baffle plate 50 can be made constant, making it less likely that pressure loss will occur.

[0060] In this embodiment, in the plate-shaped member 60, the angle formed on the base end side and on the rotation axis side between the extending direction of the first portion 61 and the extending direction of the second portion 62 is an obtuse angle, which makes it possible to reduce stress concentration at the portion where the first portion 61 and the second portion 62 intersect, compared to when the angle between the extending direction of the first portion 61 and the extending direction of the second portion 62 is a right angle. This makes it possible to suppress damage to the plate-shaped member 60.

[0061] In this embodiment, a baffle plate 50 including a sound-absorbing material is provided between the cover portion 43 and the inner frame 44, thereby reducing noise caused by driving the compressor 3. In particular, the inclined portion 51 of the baffle plate 50 extends from the outer end portion 51a fixed to the cylindrical portion 41 toward the cover portion 43 in a direction intersecting the rotation axis H, thereby reducing noise generated on the compressor side, particularly the axial component.

[0062] In this embodiment, by providing the wall portion 82 at the outer end of the bottom portion 81 of the mounting portion 80, not only the bottom portion 81 but also the wall portion 82 can resist radial forces generated by vibrations of the compressor 3 and silencer 4 caused by the engine as a vibration source. Since the bottom portion 81 and the wall portion 82 of this embodiment each have an annular shape, radial forces can be dispersed along the circumference, thereby suppressing stress concentration. This increases the durability of the mounting portion 80. This suppresses damage to the mounting portion 80. As a result, the silencer 4 and the turbocharger 1 can be made larger.

[0063] In this embodiment, the radial thickness L82 of the wall portion 82 of the mounting portion 80 is greater than the axial thickness L81 of the bottom portion 81, and therefore the wall portion 82 can appropriately distribute radial forces. This improves the vibration resistance of the wall portion 82 against radial forces generated by vibrations of the compressor 3 and silencer 4, which are caused by the engine as a vibration source.

[0064] In this embodiment, the housing 40 attached to the mounting portion 83 and the wall portion 82 of the installation portion 80 are spaced apart in the radial direction, thereby suppressing friction that occurs between the wall portion 82 of the installation portion 80 and the inner surface 42 of the tubular portion 41 of the housing 40, and allowing the housing 40 and the wall portion 82 of the installation portion 80 to fit together smoothly.

[0065] The turbocharger and silencer according to the present disclosure are not limited to the above-described embodiments, and various other modifications are possible. For example, the above-described embodiments may be combined with each other depending on the required purpose and effect.

[0066] In the above-described embodiment, the silencer 4 includes both the baffle plate 50 and the mounting portion 80. However, the silencer 4 may include at least one of the baffle plate 50 and the mounting portion 80. That is, the silencer 4 may include the baffle plate 50 and a mounting portion different from the mounting portion 80. In this case, the mounting portion may be made of sheet metal. The silencer 4 may include the baffle plate 50 but not the mounting portion 80. On the other hand, the silencer 4 may include the mounting portion 80 and a baffle plate different from the baffle plate 50. In this case, the length of the baffle plate along the rotation axis H from the outer end of the baffle plate to the opening 41e formed in the base end 41d of the cylindrical portion 41 may be equal to or greater than the length of the baffle plate along the rotation axis H from the inner end of the baffle plate to the opening 41e formed in the base end 41d of the cylindrical portion 41.

[0067] The baffle plate 50 does not have to have the curved tip portion 52. In this case, a through hole 52c may be formed in the inclined portion 51. Furthermore, the baffle plate 50 does not have to extend along the inner frame 44. In this case, the baffle plate 50 may extend in the axial direction toward or away from the inner frame 44.

[0068] The first portion 61 of the plate-shaped member 60 does not have to extend along the curved tip portion 52. It is sufficient that the first portion 61 of the plate-shaped member 60 is fixed to at least a part of the inclined portion 51 via the fixing portion 70. In the silencer 4, the baffle plate 50 may be fixed by one plate-shaped member 60.

[0069] The attachment portion 83 of the installation portion 80 does not have to include the reinforcing portion 85. The cylindrical portion 41 and the inner frame 44 may be fixed to different attachment portions 83, respectively.

[0070] [Note] The silencer and the turbocharger include the following components.

[0071] The present disclosure relates to a silencer that is attached to the intake port side of a compressor of a turbocharger, a cylindrical portion having an axis in the direction of the rotation axis of the impeller of the compressor; a lid portion attached to a tip end of the cylindrical portion having an opening; an inner frame including a curved wall portion that is curved at a base end side of the interior of the cylindrical portion and that protrudes in the rotation axis direction from the base end side of the cylindrical portion toward the lid portion, and in which an air supply port is formed; a baffle plate located between the lid portion and the inner frame within the cylindrical portion, the baffle plate having a through hole formed therein; The outer end of the baffle plate is fixed to the cylindrical portion, a length along the rotation axis from the outer end of the baffle plate to an opening formed at the base end of the cylindrical portion is shorter than a length along the rotation axis from the inner end of the baffle plate to an opening formed at the base end of the cylindrical portion; Silencer."

[0072] The present disclosure states, [2] "The cylindrical portion is formed with a suction opening portion that communicates the inside of the cylindrical portion with the outside of the cylindrical portion, The baffle plate is an inclined portion extending from the outer end portion fixed to the cylindrical portion toward the lid portion in a direction intersecting the rotation axis; a tip curved portion that is curved so as to protrude from a tip end of the inclined portion toward the lid portion in the direction of the rotation axis and has an opening that is centered on the rotation axis; The silencer according to the above item [1],

[0073] The present disclosure states, [3] "The cylindrical portion is formed with a suction opening portion that communicates the inside of the cylindrical portion with the outside of the cylindrical portion, The silencer according to the above item [1] or [2], wherein at least a portion of the baffle plate extends along the inner frame.

[0074] The present disclosure also provides [4] "a first portion fixed to the baffle plate and extending along at least a portion of the baffle plate; a second portion fixed to the inner surface of the cylindrical portion and extending along the inner surface; Further, a plate-like member having The silencer according to any one of the above [1] to [3], wherein an angle formed on the base end side and on the rotation axis side between an extending direction of the first portion and an extending direction of the second portion is an obtuse angle.

[0075] The present disclosure is [5] "The silencer according to any one of the above [1] to [4], wherein the baffle plate includes a sound-absorbing material."

[0076] The present disclosure also provides a method for manufacturing a compressor, comprising: [6] "a bottom portion facing the compressor and fixed to the compressor; a wall portion extending from an outer end of the bottom portion along the rotation axis direction, at least a portion of which can be accommodated within the cylindrical portion; The silencer according to any one of the above items [1] to [5], further comprising an installation part having the following.

[0077] The present disclosure is [7] "A silencer according to any one of the above [6], wherein the thickness of the wall portion in the direction of the rotational diameter is greater than the thickness of the bottom portion in the direction of the rotational axis."

[0078] The present disclosure states, [8] "The installation portion has a mounting portion that protrudes outward in the rotational diameter direction from the wall portion, The rotor according to the above [6] or [7], wherein the cylindrical portion attached to the attachment portion and the wall portion of the installation portion are spaced apart in the rotational radial direction.

[0079] The present disclosure provides a silencer attached to the intake port side of a compressor of a turbocharger, a cylindrical portion having an axis in the direction of the rotation axis of the impeller of the compressor; a lid portion attached to a tip end of the cylindrical portion having an opening; an inner frame including a curved wall portion that is curved at a base end side of the interior of the cylindrical portion and that protrudes in the rotation axis direction from the base end side of the cylindrical portion toward the lid portion, and in which an air supply port is formed; a baffle plate located between the lid portion and the inner frame within the cylindrical portion, the baffle plate having a through hole formed therein; an installation portion having a bottom portion facing the compressor and fixed to the compressor, and a wall portion extending from an outer end of the bottom portion along the rotation axis direction and capable of being accommodated within the cylindrical portion; A silencer equipped with a silencer.

[0080] The present disclosure is

[10] "a turbocharger including the silencer according to any one of the above [1] to [9]." [Explanation of symbols]

[0081] 1. Turbocharger 3 Compressor 4 silencer 41 Cylindrical part 41a Intake opening 42 Inner 43 Lid 44 Inner Frame 46 Curved wall 50 Baffle plate 51 Slope 51a Outer end 52 Tip curved part 52b Inner end 52c through hole 60 Plate-shaped member 61 Part 1 62 Part 2 80 Installation section 81 Bottom 82 Wall section 83 Mounting part H Rotation axis

Claims

1. A silencer attached to the intake port side of a compressor of a turbocharger, a cylindrical portion having an axis in the direction of the rotation axis of the impeller of the compressor; a lid portion attached to a tip end of the cylindrical portion having an opening; an inner frame including a curved wall portion that is curved at a base end side of the interior of the cylindrical portion and that protrudes in the rotation axis direction from the base end side of the cylindrical portion toward the lid portion, and in which an air supply port is formed; a baffle plate located between the lid portion and the inner frame within the cylindrical portion, the baffle plate having a through hole formed therein; The outer end of the baffle plate is fixed to the cylindrical portion, a length along the rotation axis from the outer end of the baffle plate to an opening formed at the base end of the cylindrical portion is shorter than a length along the rotation axis from the inner end of the baffle plate to an opening formed at the base end of the cylindrical portion; Silencer.

2. a suction opening portion that communicates the inside of the cylindrical portion with the outside of the cylindrical portion is formed in the cylindrical portion; The baffle plate is an inclined portion extending from the outer end portion fixed to the cylindrical portion toward the lid portion in a direction intersecting the rotation axis; a tip curved portion that is curved so as to protrude from a tip end of the inclined portion toward the lid portion in the direction of the rotation axis and has an opening that is centered on the rotation axis; 2. The silencer of claim 1, having:

3. a suction opening portion that communicates the inside of the cylindrical portion with the outside of the cylindrical portion is formed in the cylindrical portion; The silencer according to claim 1 or 2, wherein at least a portion of the baffle plate extends along the inner frame.

4. a first portion fixed to the baffle plate and extending along at least a portion of the baffle plate; and a second portion fixed to an inner surface of the cylindrical portion and extending along the inner surface. Further comprising a plate-like member having The silencer according to claim 1 or 2, wherein an angle formed between an extending direction of the first portion and an extending direction of the second portion on the base end side and on the rotation axis side is an obtuse angle.

5. 3. The silencer according to claim 1, wherein the baffle plate includes a sound absorbing material.

6. a bottom portion facing the compressor and fixed to the compressor; a wall portion extending from an outer end of the bottom portion along the rotation axis direction, at least a portion of which can be accommodated within the cylindrical portion; The silencer of claim 1 or 2, further comprising a mounting portion having:

7. The silencer according to claim 6, wherein a thickness of the wall portion in a radial direction of rotation is greater than a thickness of the bottom portion in a direction of the rotation axis.

8. the installation portion has an attachment portion that protrudes outward in a rotational radial direction from the wall portion, The silencer according to claim 6 , wherein the cylindrical portion attached to the attachment portion and the wall portion of the installation portion are spaced apart in the radial direction of rotation.

9. A silencer attached to the intake port side of a compressor of a turbocharger, a cylindrical portion having an axis in the direction of the rotation axis of the impeller of the compressor; a lid portion attached to a tip end of the cylindrical portion having an opening; an inner frame including a curved wall portion that is curved at a base end side of the interior of the cylindrical portion and that protrudes in the rotation axis direction from the base end side of the cylindrical portion toward the lid portion, and in which an air supply port is formed; a baffle plate located between the lid portion and the inner frame within the cylindrical portion, the baffle plate having a through hole formed therein; an installation portion having a bottom portion facing the compressor and fixed to the compressor, and a wall portion extending from an outer end of the bottom portion along the rotation axis direction and capable of being accommodated within the cylindrical portion; A silencer.

10. A turbocharger comprising the silencer according to claim 1 or 9.

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