Engine

Abstract

The invention provides an engine, and relates to a technology capable of appropriately suppressing vibration of a supercharger of the engine. An engine is provided with an engine main body and a supercharger. The engine main body is provided with a support part for supporting the supercharger. The supporting part is provided with a dynamic vibration absorber. The dynamic absorber is connected to the supercharger via a connection portion.

Description

Technical Field

[0001] The present invention relates to an engine. Background Art

[0002] Conventionally, it is known to dispose a vibration damping device between an engine and a fixed object when the engine is fixed to the fixed object. For example, Patent Document 1 discloses that a vibration damping device is disposed between the engine and the hull to prevent vibration from being transmitted between the engine and the hull.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-183854 Summary of the Invention

[0006] Placing a vibration damping device between the engine and the object to which it is mounted can suppress the transmission of engine vibration to the object. However, unlike when the engine is immobilized relative to the object, placing a vibration damping device between the engine and the object allows the engine itself to vibrate freely. This free vibration of the engine itself can sometimes increase the vibration of the supercharger mounted on the engine, causing its vibration level to become problematic.

[0007] An object of the present invention is to provide a technique capable of appropriately suppressing vibration of a supercharger included in an engine.

[0008] An engine shown as an example of the present invention includes an engine body and a supercharger. The engine body includes a support portion for supporting the supercharger. The support portion includes a dynamic vibration absorber. The dynamic vibration absorber is connected to the supercharger via a connecting portion.

[0009] Effects of the Invention

[0010] According to the present invention described as an example, vibration of a supercharger included in an engine can be appropriately suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a front view showing the schematic structure of the engine.

[0012] Figure 2 This is a front view of the engine schematically showing the relationship between the engine body and the supercharger.

[0013] Figure 3 It is a front view schematically showing the structure of an engine equipped with a dynamic vibration absorber.

[0014] Figure 4This is a schematic enlarged perspective view showing an enlarged portion of the engine where the dynamic vibration absorber is arranged.

[0015] Figure 5 It is a perspective view showing a schematic structure of the first dynamic vibration absorber.

[0016] Figure 6A It is a perspective view showing a schematic structure of a first portion of the first dynamic vibration absorber.

[0017] Figure 6B It is a perspective view showing a schematic structure of the second portion of the first dynamic vibration absorber.

[0018] Figure 7 It is a front view showing a schematic structure of a first dynamic vibration reducer according to a modified example.

[0019] Description of Reference Numerals

[0020] 1…Engine body; 2…Supercharger; 3…Dynamic vibration absorber; 4…Connecting portion; 15…Intercooler (support portion); 22…Exhaust turbine portion; 23…Exhaust turbine downstream passage portion; 31, 31A…First dynamic vibration absorber; 32…Second dynamic vibration absorber; 100…Engine; 152…Dynamic vibration absorber mounting portion; 301…First dynamic vibration absorber frame; 302…Second dynamic vibration absorber frame; 1521…First dynamic vibration absorber mounting portion; 1522…Second dynamic vibration absorber mounting portion; EB…Elastomer; SP…Support portion; WT…Counterweight; DETAILED DESCRIPTION

[0021] The embodiment of the present invention will be described with reference to the accompanying drawings. In addition, the same or corresponding parts in the drawings are marked with the same reference numerals, and the description will not be repeated unless otherwise specified.

[0022] <1. Engine Overview>

[0023] Figure 1 1 is a front view showing a schematic structure of an engine 100 according to an embodiment of the present invention. Figure 1 An overview of engine 100 will be described.

[0024] When describing the engine 100, the directions in this specification are defined as follows. The direction perpendicular to the mounting surface 200 on which the engine 100 is mounted is defined as the up-down direction, and the engine 100 is assumed to be located on the upper side relative to the mounting surface 200. In addition, the direction in which the axis of the crankshaft 11 of the engine 100 mounted on the mounting surface 200 extends is defined as the front-back direction. Figure 1In the figure, the front-to-back direction is perpendicular to the paper, the front side is the side closest to the front of the paper, and the back side is the side closest to the front of the paper. The direction perpendicular to the up-down direction and the front-to-back direction is the left-to-right direction. When viewing the engine 100 from the front (front), the right side is the right side, and the left side is the left side. The above directions are merely descriptive terms and are not intended to limit actual positional relationships or directions.

[0025] In addition, in the drawings, the front side is represented by the symbol “F”, the rear side is represented by the symbol “B”, the left side is represented by the symbol “L”, the right side is represented by the symbol “R”, the upper side is represented by the symbol “U”, and the lower side is represented by the symbol “D”.

[0026] As an example, the engine 100 of this embodiment is a marine engine used for propulsion of a ship. However, the engine 100 is not limited to a marine engine and may be other engines such as an engine for power generation. The engine 100 is, for example, a diesel engine.

[0027] The engine 100 is mounted on a mounting surface 200, such as a floor provided on the hull. Specifically, the engine 100 is positioned on the mounting surface 200 via the vibration damping device 10. This creates a structure that minimizes the transmission of vibrations between the engine 100 and the hull. However, with the structure of this embodiment, there is a possibility that the engine 100 may vibrate on the vibration damping device 10.

[0028] like Figure 1 As shown, the engine 100 includes an engine body 1 and a supercharger 2. The engine body 1 includes, for example, a crankshaft 11, a cylinder block 12, and a cylinder head 13.

[0029] The majority of the crankshaft 11, which extends in the front-to-back direction, is housed in the cylinder block 12. The cylinder block 12 is formed with a plurality of cylinders (not shown) spaced apart in the front-to-back direction. Each cylinder extends in the vertical direction. Each cylinder houses a piston (not shown) connected to the crankshaft 11 via a connecting rod. The piston is able to move in the vertical direction within the cylinder. The crankshaft 11 rotates about its axis, which extends in the front-to-back direction, as the pistons reciprocate in the cylinders.

[0030] The flywheel 14 is attached to the front end portion of the crankshaft 11. The flywheel 14 rotates integrally with the crankshaft 11 and is used to extract power from the engine 100.

[0031] The cylinder head 13 is mounted on the upper side of the cylinder block 12. A combustion chamber is formed for each cylinder by combining the cylinder head 13 and the cylinder block 12. An intake gas (a representative example is air) is supplied to each combustion chamber by the intake system of the engine 100. After the intake gas supplied to each combustion chamber is compressed, fuel is injected by the fuel supply system of the engine 100. As a result, combustion can be caused in the combustion chamber, causing the piston to move up and down. The exhaust system of the engine 100 is used to discharge the exhaust gas generated in each combustion chamber to the outside of the combustion chamber.

[0032] The supercharger 2 is located on the upper front portion of the engine 100. The supercharger 2 is supported by the engine body 1. The structure for supporting the supercharger 2 by the engine body 1 will be described in detail later. The supercharger 2 is a so-called turbocharger that uses exhaust gas from the engine body 1 as its driving source.

[0033] The supercharger 2 includes a compression unit 21. The compression unit 21 takes in gas such as air from the outside of the engine 100 (see Figure 1 The compression unit 21 supplies the compressed intake gas to each combustion chamber via the intercooler 15 and the like.

[0034] The supercharger 2 also includes an exhaust turbine unit 22 and an exhaust turbine downstream passage 23. The exhaust turbine unit 22 is connected to an exhaust passage (not shown; specifically, an exhaust pipe) provided in the engine body 1. The exhaust turbine downstream passage 23 is connected to the exhaust outlet of the exhaust turbine unit 22. The exhaust turbine downstream passage 23 is, for example, an exhaust pipe made of aluminum or an aluminum alloy. The exhaust outlet of the exhaust turbine unit 22 is formed by an opening provided on the right side of the exhaust turbine unit 22.

[0035] The exhaust turbine section 22 is supplied with exhaust gas discharged from each combustion chamber. The exhaust turbine section 22 rotates a turbine shaft (not shown) using the supplied exhaust gas. The exhaust turbine section 22 transmits the rotational power generated by the rotation of the turbine shaft to the compression section 21. The compression section 21 is driven by the rotational power transmitted from the exhaust turbine section 22. The exhaust turbine section 22 discharges the used exhaust gas to the outside of the supercharger 2 via the exhaust turbine downstream passage section 23 (see FIG. Figure 1 solid line with blank arrows).

[0036] In addition, the intercooler 15 is provided on the front surface side of the engine body 1 and below the supercharger 2. In detail, the intercooler 15 is firmly fixed to the cylinder block 12 at a plurality of boss portions provided on an intercooler housing (not shown) constituting the intercooler 15. The intercooler 15 cools the intake gas sent from the supercharger 2. The intake gas supplied from the compression section 21 of the supercharger 2 is pressurized and compressed to generate compression heat and increase the temperature. The intercooler 15 cools the intake gas by exchanging heat between the cooling water supplied by the pump drive and the pressurized and compressed intake gas. That is, by providing the intercooler 15, the temperature of the intake gas supplied to each combustion chamber can be adjusted to a desired temperature.

[0037] <2. Relationship between the Engine and Supercharger>

[0038] Figure 2 This is a front view of the engine 100 schematically illustrating the relationship between the engine body 1 and the supercharger 2. The supercharger 2 of this embodiment has a layout in which the direction of exhaust gas flowing into the exhaust turbine 22 is radial relative to the turbine shaft (not shown) extending in the horizontal direction. In other words, the supercharger 2 is a so-called radial supercharger. The supercharger 2, configured as a radial supercharger, has an intermediate support structure with a bearing 24 disposed between the compressor 21 and the exhaust turbine 22 (in the horizontal direction).

[0039] The engine body 1 includes a support portion SP that supports the supercharger 2. In this embodiment, the support portion SP is the intercooler 15 described above. As described above, the intercooler 15 is fixed to the cylinder block 12. Therefore, it can be said that the supercharger 2 is supported by the support portion SP provided on the cylinder block 12. Furthermore, the support portion SP does not necessarily need to be the intercooler 15; it may also be formed by other parts or components provided on the cylinder block 12 or cylinder head 13.

[0040] Specifically, the supercharger 2 is fixed to a supercharger support bracket 151 provided on the intercooler 15. The supercharger support bracket 151 extends upward from a frame (not shown) constituting the intercooler 15. The supercharger support bracket 151 may be a separate component from the frame constituting the intercooler 15, or may be the same component.

[0041] As described above, the supercharger 2 has an intermediate support structure. Therefore, the supercharger support bracket 151 is connected to the bearing 24 to support the bearing 24 between the compressor 21 and the exhaust turbine 22. Specifically, the portion (main portion) of the supercharger 2 consisting of the compressor 21 and the exhaust turbine 22 is supported (fixed) at a single location in the middle by the supercharger support bracket 151. The main portion of the supercharger 2 is supported using a structure similar to a seesaw (or a carrying doll).

[0042] The supercharger 2 having the above-mentioned seesaw structure as a supporting structure is easily affected by the vibration from the engine body 1 and vibrates. Moreover, a radial supercharger having the same structure as the supercharger 2 of this embodiment generally has a heavier rotating part and a shorter rotating shaft than an axial supercharger having a layout in which the exhaust gas inflow direction is in the direction of the turbine shaft, and therefore tends to have a tendency to increase vibration. In view of this, the engine 100 of this embodiment is formed as follows: a dynamic vibration absorber (dynamic damper) 3 is provided to suppress the vibration of the supercharger 2 (see the following description). Figure 3 ).

[0043] Figure 3 This is a front view schematically illustrating the structure of an engine 100 equipped with dynamic vibration absorbers 3. In this embodiment, the engine 100 is equipped with two dynamic vibration absorbers 3: a first dynamic vibration absorber 31 and a second dynamic vibration absorber 32. In this embodiment, when suppressing the vibration of the supercharger 2, it is known that there are two natural vibration frequencies to be suppressed in the engine 100. Therefore, the number of dynamic vibration absorbers 3 is set to two. However, the number of dynamic vibration absorbers 3 can be appropriately changed depending on the number of natural vibration frequencies to be suppressed in the engine 100. That is, the number of dynamic vibration absorbers 3 equipped in the engine 100 can be either one or multiple, as needed.

[0044] In this embodiment, the support portion SP includes a dynamic vibration absorber 3 connected to the supercharger 2 via a connecting portion 4. Specifically, in this embodiment, the dynamic vibration absorber 3 provided on the support portion SP suppresses the vibration of the supercharger 2, rather than the supercharger 2. This configuration eliminates the need to directly attach the dynamic vibration absorber 3 to the supercharger 2, thereby reducing the likelihood that the dynamic vibration absorber 3 will be exposed to the heat from the supercharger 2. This also reduces degradation of components (such as rubber components) that comprise the dynamic vibration absorber 3. By suppressing degradation caused by heat, the dynamic vibration absorber 3 can suppress vibration of the supercharger 2, enabling long-term and appropriate vibration suppression.

[0045] Furthermore, in this embodiment, the dynamic vibration reducer 3 is positioned below the supercharger 2. The hot air surrounding the supercharger 2, which is abundant, tends to flow upward. Therefore, positioning the dynamic vibration reducer 3 below the supercharger 2 reduces the likelihood of the dynamic vibration reducer 3 being exposed to the hot air. This reduces the risk of degradation of the components of the dynamic vibration reducer 3 due to the hot air.

[0046] Furthermore, in this embodiment, the support portion SP includes multiple dynamic vibration absorbers 3. Installing multiple dynamic vibration absorbers 3 on the support portion SP allows for the suppression of vibrations originating from a variety of natural frequencies. Furthermore, since each dynamic vibration absorber 3 is installed on the support portion SP, degradation caused by thermal energy can be suppressed for all of the multiple dynamic vibration absorbers 3 installed. Furthermore, since all of the dynamic vibration absorbers 3 are located below the supercharger 2, degradation of the dynamic vibration absorbers 3 due to thermal energy can also be suppressed.

[0047] Specifically, the support portion SP includes a dynamic vibration absorber mounting portion 152 for mounting the dynamic vibration absorber 3. The connecting portion 4 connecting the supercharger 2 and the dynamic vibration absorber 3 includes a connecting member 41 connecting the exhaust turbine downstream passage portion 23 and the dynamic vibration absorber mounting portion 152. With this structure, the dynamic vibration absorber 3 is not positioned on the left side of the compression section 21 of the supercharger 2, but on the right side of the exhaust turbine section 22. The supercharger 2 is configured to be heavier on the right side of the exhaust turbine section 22 than on the left side of the compression section 21. Therefore, in this embodiment, the dynamic vibration absorber 3 is positioned on the heavier side of the supercharger 2, enabling the vibration suppression effect of the dynamic vibration absorber 3 to be more effectively exerted.

[0048] More specifically, the intercooler 15, which serves as the support portion SP, includes a first dynamic vibration absorber mounting portion 1521 to which the first dynamic vibration absorber 31 is mounted, and a second dynamic vibration absorber mounting portion 1522 to which the second dynamic vibration absorber 32 is mounted. The first dynamic vibration absorber mounting portion 1521 is formed of a plate-shaped member extending to the right from a frame member (not shown) that constitutes the intercooler 15. The first dynamic vibration absorber 31 is arranged on the lower surface of the right end portion of the first dynamic vibration absorber mounting portion 1521. The second dynamic vibration absorber mounting portion 1522 is formed of a plate-shaped member extending to the right from a frame member (not shown) that constitutes the intercooler 15 at a position lower than the first dynamic vibration absorber mounting portion 1521. The second dynamic vibration absorber 32 is arranged on the lower surface of the right end portion of the second dynamic vibration absorber mounting portion 1522.

[0049] The connecting portion 4 includes a first connecting member 41 that connects the exhaust turbine downstream passage portion 23 and the first dynamic vibration absorber mounting portion 1521, and a second connecting member 42 that connects the first dynamic vibration absorber mounting portion 1521 and the second dynamic vibration absorber mounting portion 1522. The first connecting member 41 is provided upright on the upper surface of the plate-shaped first dynamic vibration absorber mounting portion 1521, with its upper end fixed to the right end of the exhaust turbine downstream passage portion 23. The second connecting member 42 is provided upright on the upper surface of the plate-shaped second dynamic vibration absorber mounting portion 1522, with its upper end fixed to the lower surface of the first dynamic vibration absorber mounting portion 1521. The connecting members 41 and 42 can be secured to various parts using fasteners such as screws.

[0050] The first dynamic vibration absorber 31 is connected to the exhaust turbine downstream passage portion 23 via the first dynamic vibration absorber mounting portion 1521 and the first connecting member 41. The second dynamic vibration absorber 32 is connected to the exhaust turbine downstream passage portion 23 via the second dynamic vibration absorber mounting portion 1522, the second connecting member 42, the first dynamic vibration absorber mounting portion 1521, and the first connecting member 41.

[0051] In addition, in this embodiment, if Figure 3 As shown, the multiple dynamic vibration absorbers 3 are arranged with their height positions staggered in the vertical direction. The multiple dynamic vibration absorbers 3 are arranged in a vertical direction when viewed from the front. This structure can suppress an increase in the width (left-right length) of the engine 100 compared to a structure in which the multiple dynamic vibration absorbers 3 are arranged in a left-right direction. Furthermore, this structure can suppress an increase in the depth (front-back length) of the engine 100 compared to a structure in which the multiple dynamic vibration absorbers 3 are arranged in a front-back direction. However, the present invention does not exclude structures in which the multiple dynamic vibration absorbers 3 are arranged in a left-right or front-back direction, and the above structures may also be adopted.

[0052] <3. Dynamic Vibration Absorber Structure>

[0053] Next, the structure of the dynamic vibration reducer 3 included in the engine 100 will be described. Figure 4 1 is a schematic enlarged perspective view showing an enlarged portion of the engine 100 where the dynamic vibration absorber 3 is disposed. Figure 1 In the figure, the dynamic vibration absorber 3 is a structure in which a cover component is installed and the internal structure is not visible, but in Figure 4 FIG. 3 shows the dynamic vibration absorber 3 with the cover member removed.

[0054] like Figure 4As shown, the first dynamic vibration absorber 31 mounted on the first dynamic vibration absorber mounting portion 1521 and the second dynamic vibration absorber 32 mounted on the second dynamic vibration absorber mounting portion 1522 are arranged in different orientations, but their basic structures are the same. Therefore, the following description of the structure of the dynamic vibration absorber 3 will use the structure of the first dynamic vibration absorber 31 as an example, and a detailed description of the structure of the second dynamic vibration absorber 32 will be omitted.

[0055] In this embodiment, the orientations of the first dynamic vibration absorber 31 and the second dynamic vibration absorber 32 differ by 90° in a plan view. However, the orientations of the first dynamic vibration absorber 31 and the second dynamic vibration absorber 32 may be the same, or may differ by an angle different from that in this embodiment.

[0056] Figure 5 : is a perspective view showing the schematic structure of the first dynamic vibration absorber 31. Figure 5 In order to facilitate understanding of the structure of the first dynamic vibration absorber 31, Figure 4 I intentionally changed the direction of observation. Figure 4 This is a picture viewed from the upper right. Figure 5 This is a diagram viewed from the upper left. Figure 5 As shown, the first dynamic vibration absorber 31 (dynamic vibration absorber 3) includes a first portion 3a and a second portion 3b. The first portion 3a and the second portion 3b are provided so as to be divisible.

[0057] Figure 6A It is a perspective view showing a schematic structure of the first portion 3 a of the first dynamic vibration absorber 31 . Figure 6B It is a perspective view showing a schematic structure of the second portion 3 b of the first dynamic vibration absorber 31 . Figure 6A and Figure 6B It will Figure 5 The first dynamic vibration absorber 31 is shown divided into a first portion 3a and a second portion 3b.

[0058] like Figure 6A and Figure 4 As shown, the first portion 3a (in other words, the dynamic vibration absorber 3) includes a first dynamic vibration absorber frame 301, which is suspended from a dynamic vibration absorber mounting portion 152 (specifically, a first dynamic vibration absorber mounting portion 1521) provided on the support portion SP and on which the elastic body EB is mounted. The first dynamic vibration absorber frame 301 is U-shaped when viewed from the front.

[0059] Specifically, the first dynamic vibration absorber frame 301 includes a rectangular plate-shaped elastic body support portion 3011 extending in the left-right direction. An elastic body EB is mounted on the upper surface of the elastic body support portion 3011 in a fixed state using fasteners such as screws. In this embodiment, a plurality (specifically, three) of elastic bodies EB are mounted on the elastic body support portion 3011, but this is merely an example. Alternatively, the elastic body support portion 3011 may be mounted with only one elastic body EB or with multiple elastic bodies EB other than three. Furthermore, a specific example of an elastic body EB is a rubber member.

[0060] In addition, the first dynamic vibration absorber frame 301 has a pair of mounting wall portions 3012 that are erected at both ends of the elastic body mounting portion 3011 in the left-right direction (longitudinal direction). The pair of mounting wall portions 3012 are fixed to the lower surface of the first dynamic vibration absorber mounting portion 1521 using fixing members such as screws in a state where the upper surfaces of the pair of mounting wall portions 3012 are arranged to face the lower surface of the first dynamic vibration absorber mounting portion 1521. In addition, in the state where the first portion 3a and the second portion 3b are combined ( Figure 5 The pair of mounting wall portions 3012 are fixed to the first dynamic vibration absorber mounting portion 1521 in the state shown in FIG.

[0061] like Figure 6B and Figure 4 As shown, the second portion 3b (in other words, the dynamic vibration absorber 3) includes a second dynamic vibration absorber frame 302, which is supported on the first dynamic vibration absorber frame 301 via elastic bodies EB and suspends the counterweight WT. The second dynamic vibration absorber frame 302 has an inverted U-shape when viewed from the side. Specifically, the second dynamic vibration absorber frame 302 is vertically inverted compared to the first dynamic vibration absorber frame 301, and the orientation of the U is 90° different.

[0062] Specifically, the second dynamic vibration absorber frame 302 includes a rectangular mounting plate portion 3021 extending in the front-to-back direction. The mounting plate portion 3021 is placed on the elastic body EB, with its lower surface facing the upper surface of the elastic body EB placed on the elastic body placement portion 3011. While placed on the elastic body EB, the mounting plate portion 3021 is secured to the elastic body EB using fasteners such as screws. In this embodiment, multiple elastic bodies are placed on the elastic body placement portion 3011, and therefore, the mounting plate portion 3021 is secured to each of the multiple elastic bodies EB.

[0063] In addition, the second dynamic vibration absorber frame 302 has a pair of counterweight support portions 3022 extending downward from both ends of the mounting plate portion 3021 in the front-to-back direction (length direction). The front counterweight support portion 3022 of the pair of counterweight support portions 3022 supports the front end of the rectangular plate-shaped counterweight WT extending in the front-to-back direction. In addition, the rear counterweight support portion 3022 of the pair of counterweight support portions 3022 supports the rear end of the rectangular plate-shaped counterweight WT extending in the front-to-back direction. In detail, the front and rear ends of the counterweight WT are fixed to the pair of counterweight support portions 3022 by screw fastening, thereby causing the counterweight WT to be suspended from the pair of counterweight support portions 3022.

[0064] Furthermore, in this embodiment, the weight WT is a structure in which multiple weight plates WP are stacked in the vertical direction, but this is merely an example. The weight WT may also be composed of a single block. Furthermore, when the weight WT is composed of weight plates WP, it may be composed of only one weight plate WP. In this embodiment, multiple weight plates WP stacked in the vertical direction are fixed to the pair of weight support portions 3022 by screw fastening.

[0065] In this manner, the structure is divided into the first portion 3a having the first dynamic vibration absorber frame 301 and the second portion 3b having the second dynamic vibration absorber frame 302. This allows the weight of the counterweight WT to be easily adjusted using the second dynamic vibration absorber frame 302. Furthermore, when replacing the elastic body EB, the elastic body EB can be easily replaced by simply removing the second portion 3b.

[0066] Figure 7 This is a front view showing the schematic structure of a first dynamic vibration reducer 31A according to a modified example. Furthermore, the structure of the modified example can also be applied to the second dynamic vibration reducer 32 according to the aforementioned embodiment. The first dynamic vibration reducer 31A according to the modified example has substantially the same structure as the first dynamic vibration reducer 31 according to the aforementioned embodiment, differing in that a third dynamic vibration reducer frame 303 is added.

[0067] The third dynamic vibration absorber frame 303 has an S-shape in a front view. Specifically, the third dynamic vibration absorber frame 303 includes a first flat plate portion 3031 , a flat plate portion connecting portion 3032 , and a second flat plate portion 3033 .

[0068] The first flat plate portion 3031 is a rectangular plate extending in the front-to-back direction. The first flat plate portion 3031 is fixed to the elastic body mounting portion 3011 using screws or other fasteners, with its upper surface facing the lower surface of the elastic body mounting portion 3011. In other words, the third dynamic vibration reducer frame 303 is suspended from the first dynamic vibration reducer frame 301.

[0069] The flat plate connecting portion 3032 connects the first flat plate portion 3031 and the second flat plate portion 3033. The flat plate connecting portion 3032 is rectangular and extends downward from the lower end of the first flat plate portion 3031. The flat plate connecting portion 3032 extends downward to a position below the lower end of the counterweight WT suspended from the second dynamic vibration absorber frame 302.

[0070] The second flat plate portion 3033 extends to the left from the lower end of the flat plate portion connecting portion 3032. The second flat plate portion 3033 is in the shape of a rectangular plate that extends in a direction parallel to the left-right direction and the front-back direction. The second flat plate portion 3033 overlaps with the counterweight WT when viewed from above and has an area that is equal to or larger than that of the counterweight WT. A gap is formed between the second flat plate portion 3033 and the counterweight WT in the vertical direction. In addition, in this embodiment, the counterweight WT is fastened to the second dynamic vibration absorber frame 302 using screws, and a portion of the screw protrudes further downward than the counterweight WT, forming a gap between the portion of the protruding screw and the second flat plate portion 3033 in the vertical direction.

[0071] The provision of the third dynamic vibration absorber frame 303, for example, facilitates replacement of the elastic body EB. Specifically, to replace the elastic body EB, the screw-fastened counterweight WT is removed from the second dynamic vibration absorber frame 302 before removing the second dynamic vibration absorber frame 302 from the elastic body EB. The removed counterweight WT is then placed on the third dynamic vibration absorber frame 303. This allows replacement of the elastic body EB to be performed without the labor of moving the heavier counterweight WT to another location, making the replacement process easier for the operator.

[0072] <4. Precautions, etc.>

[0073] Various technical features disclosed in this specification may be modified in various ways without departing from the spirit of the technical creation. In addition, multiple embodiments, examples, and modifications shown in this specification may be combined and implemented within the possible scope.

[0074] <5. Notes>

[0075] The engine of the present invention shown as an example includes an engine body and a supercharger, and may have a structure (first structure) in which the engine body has a support portion for supporting the supercharger, the support portion has a dynamic vibration absorber, and the dynamic vibration absorber is connected to the supercharger via a connecting portion.

[0076] The engine of the first structure may have a structure (second structure) in which the dynamic vibration absorber is arranged below the supercharger.

[0077] Based on the engine of the first or second structure mentioned above, it can be of the following structure (third structure), wherein the supercharger has: an exhaust turbine portion, which is connected to an exhaust passage portion provided on the engine body; and an exhaust turbine downstream passage portion, which is connected to the exhaust outlet of the exhaust turbine portion, the support portion has a dynamic vibration absorber mounting portion for mounting the dynamic vibration absorber, and the connecting portion includes a connecting component connecting the exhaust turbine downstream passage portion and the dynamic vibration absorber mounting portion.

[0078] In the engine having any one of the first to third structures, a structure (fourth structure) may be adopted in which the support portion includes a plurality of the dynamic vibration absorbers.

[0079] The engine of the fourth structure may have a structure (fifth structure) in which the plurality of dynamic vibration absorbers are arranged with their height positions staggered in the vertical direction.

[0080] Based on the engine of any one of the above-mentioned first to fifth structures, it can be the following structure (sixth structure), wherein the dynamic vibration absorber has: a first dynamic vibration absorber frame, which is suspended on the dynamic vibration absorber mounting portion provided on the support portion and is provided with an elastic body for loading; and a second dynamic vibration absorber frame, which is supported on the first dynamic vibration absorber frame by means of the elastic body and suspends the counterweight.

Claims

1. An engine comprising an engine body and a supercharger, wherein: The engine body includes a support portion for supporting the supercharger. The support portion has a dynamic vibration absorber, The dynamic vibration absorber is connected to the supercharger via a connecting portion.

2. The engine according to claim 1, wherein The dynamic vibration absorber is arranged below the supercharger.

3. The engine according to claim 1 or 2, wherein: The supercharger includes an exhaust turbine portion connected to an exhaust passage portion provided in the engine body, and an exhaust turbine downstream passage portion connected to an exhaust outlet of the exhaust turbine portion. The support portion has a dynamic vibration absorber mounting portion for mounting the dynamic vibration absorber. The connection portion includes a connection member connecting the exhaust turbine downstream passage portion and the dynamic vibration reducer mounting portion.

4. The engine according to claim 1, wherein The support portion includes a plurality of the dynamic vibration absorbers.

5. The engine according to claim 4, wherein The plurality of dynamic vibration absorbers are arranged so that their height positions in the vertical direction are staggered.

6. The engine according to claim 1, wherein The dynamic vibration absorber has: a first dynamic vibration absorber frame, which is suspended from the dynamic vibration absorber mounting portion provided on the support portion and on which the elastic body is placed; and The second dynamic vibration absorber frame is supported on the first dynamic vibration absorber frame via the elastic body and suspends the counterweight.

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