engine

Abstract

To provide a technique which can appropriately suppress vibration of a supercharger provided in an engine.SOLUTION: An exemplified engine includes an engine body 1 and a supercharger 2. The engine body has a support part SP supporting the supercharger. The support part has a dynamic vibration absorber 3. The dynamic vibration absorber is connected to the supercharger via a connection part 4.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] It is known that when installing an engine on an object, a vibration isolation device is disposed between the engine and the object. For example, Patent Document 1 discloses providing a vibration isolation device between the engine and the hull to prevent vibrations from being transmitted between the engine and the hull. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-183854 Summary of the Invention [Problem to be solved by the invention]

[0004] Placing a vibration isolation device between the engine and the object on which it is to be installed can suppress the transmission of engine vibration to the object on which it is to be installed. However, when a vibration isolation device is placed between the engine and the object on which it is to be installed, the engine itself is free to vibrate, unlike when the engine is fixed so as not to move relative to the object on which it is to be installed. When the engine itself is free to vibrate in this way, the vibration of the turbocharger attached to the engine body increases, and the vibration level can become a problem.

[0005] An object of the present invention is to provide a technique capable of appropriately suppressing vibrations of a supercharger provided in an engine. [Means for solving the problem]

[0006] An exemplary engine of the present invention includes an engine body and a supercharger. The engine body has a support portion that supports the supercharger. The support portion has a dynamic vibration absorber. The dynamic vibration absorber is connected to the supercharger via a connecting portion. [Effects of the Invention]

[0007] According to the exemplary embodiment of the present invention, vibrations of a supercharger provided in an engine can be appropriately suppressed. [Brief explanation of the drawings]

[0008] [Figure 1] A front view showing the general configuration of the engine [Figure 2] FIG. 1 is a front view of an engine showing a schematic relationship between the engine body and the turbocharger. [Figure 3] FIG. 1 is a front view schematically illustrating a configuration of an engine equipped with a dynamic vibration absorber. [Figure 4] FIG. 1 is a schematic enlarged perspective view showing a portion of an engine where a dynamic vibration absorber is disposed; [Figure 5] FIG. 1 is a perspective view showing a schematic configuration of a first dynamic vibration absorber; [Figure 6A] FIG. 10 is a perspective view showing a schematic configuration of a first portion of a first dynamic vibration absorber; [Figure 6B] FIG. 10 is a perspective view showing a schematic configuration of a second portion of the first dynamic vibration absorber; [Figure 7] FIG. 10 is a front view showing a schematic configuration of a first dynamic vibration absorber according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and unless particularly necessary, the description thereof will not be repeated.

[0010] <1. Engine Overview> 1 is a front view showing a schematic configuration of an engine 100 according to an embodiment of the present invention. An overview of the engine 100 will be described with reference to FIG.

[0011] In 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 placed is defined as the up-down direction, and the engine 100 is positioned above the mounting surface 200. The direction in which the axis of the crankshaft 11 of the engine 100 placed on the mounting surface 200 extends is defined as the front-to-rear direction. In FIG. 1 , the front-to-rear direction is the direction perpendicular to the plane of the paper, with the front side being the front and the back side being the rear. The direction perpendicular to the up-to-down direction and the front-to-rear direction is defined as 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. However, the above directions are simply names used for the purpose of explanation and are not intended to limit the actual positional relationships or directions.

[0012] In the drawings, the front side is indicated by the symbol "F", the rear side by the symbol "B", the left side by the symbol "L", the right side by the symbol "R", the top side by the symbol "U", and the bottom side by the symbol "D".

[0013] The engine 100 of this embodiment is, for example, a marine engine used for propelling a ship. However, the engine 100 is not limited to a marine engine and may be, for example, another engine such as an engine used for generating electricity. The engine 100 is, for example, a diesel engine.

[0014] The engine 100 is placed on a support surface 200, such as a floor surface, provided on the hull. More specifically, the engine 100 is placed on the support surface 200 via the vibration isolation device 10. This configuration makes it difficult for vibrations to be transmitted between the engine 100 and the hull. However, in the configuration of this embodiment, the engine 100 can vibrate on the vibration isolation device 10.

[0015] 1, 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.

[0016] A large portion of the crankshaft 11, which extends in the front-to-rear direction, is housed in a cylinder block 12. A plurality of cylinders (not shown) are formed in the cylinder block 12 and arranged at intervals in the front-to-rear direction. Each cylinder extends in the vertical direction. Each cylinder houses a piston (not shown) that is connected to the crankshaft 11 via a connecting rod. Inside the cylinder, the piston can move in the vertical direction. The crankshaft 11 rotates about an axis that extends in the front-to-rear direction as the pistons in each cylinder reciprocate.

[0017] A flywheel 14 is attached to the front end of the crankshaft 11. The flywheel 14 rotates integrally with the crankshaft 11 and is used to extract power from the engine 100.

[0018] The cylinder head 13 is attached to the upper side of the cylinder block 12. Combining the cylinder head 13 and the cylinder block 12 forms a combustion chamber for each cylinder. Intake gas (typically air) is supplied to each combustion chamber using an intake system provided in the engine 100. After the supplied intake gas is compressed, fuel is injected into each combustion chamber using a fuel supply system provided in the engine 100. This causes combustion in the combustion chamber, causing the piston to reciprocate up and down. Exhaust gas generated in each combustion chamber is exhausted to the outside of the combustion chamber using an exhaust system provided in the engine 100.

[0019] The supercharger 2 is disposed on the upper front side of the engine 100. The supercharger 2 is supported by the engine body 1. Details of the support structure of the supercharger 2 by the engine body 1 will be described later. The supercharger 2 is a so-called turbocharger that uses exhaust gas from the engine body 1 as a driving source.

[0020] The turbocharger 2 has a compressor unit 21. The compressor unit 21 takes in gas such as air from outside the engine 100 (see the dashed white arrow in FIG. 1 ) and compresses the intake gas. The compressor unit 21 supplies the compressed and compressed intake gas to each combustion chamber via the intercooler 15, etc.

[0021] The turbocharger 2 also has an exhaust turbine section 22 and an exhaust turbine downstream passage section 23. The exhaust turbine section 22 is connected to an exhaust passage section (not shown; a specific example is an exhaust pipe) provided in the engine body 1. The exhaust turbine downstream passage section 23 is connected to an exhaust outlet of the exhaust turbine section 22. The exhaust turbine downstream passage section 23 is an exhaust pipe made of, for example, aluminum or an aluminum alloy. The exhaust outlet of the exhaust turbine section 22 is formed by an opening provided on the right side surface of the exhaust turbine section 22.

[0022] The exhaust turbine section 22 is supplied with exhaust gas exhausted from each combustion chamber. The exhaust turbine section 22 uses the supplied exhaust gas to rotate a turbine shaft (not shown). The exhaust turbine section 22 transmits rotational power generated by the rotation of the turbine shaft to the compressor section 21. The compressor section 21 is driven by the rotational power transmitted from the exhaust turbine section 22. The exhaust turbine section 22 discharges used exhaust gas to the outside of the turbocharger 2 via the exhaust turbine downstream passage section 23 (see the solid white arrow in FIG. 1).

[0023] The intercooler 15 is provided on the front side of the engine body 1, below the turbocharger 2. More specifically, the intercooler 15 is rigidly fixed to the cylinder block 12 by a plurality of bosses provided on an intercooler housing (not shown) that constitutes the intercooler 15. The intercooler 15 cools the intake gas sent from the turbocharger 2. The intake gas supplied from the compressor section 21 of the turbocharger 2 is pressurized and compressed, generating heat of compression and increasing its temperature. The intercooler 15 cools the intake gas by exchanging heat between the cooling water supplied by driving a pump and the pressurized and compressed intake gas. In other words, by providing the intercooler 15, the temperature of the intake gas supplied to each combustion chamber can be adjusted to a desired temperature.

[0024] <2. Relationship between the engine body and the turbocharger> 2 is a front view of the engine 100, schematically showing the relationship between the engine body 1 and the turbocharger 2. The turbocharger 2 of this embodiment has a layout in which the flow direction of exhaust gas into the exhaust turbine section 22 is radial to a turbine shaft (not shown) extending in the left-right direction. In other words, the turbocharger 2 is a so-called radial turbocharger. The turbocharger 2 configured as a radial turbocharger has an intermediate support structure in which a bearing section 24 is disposed between the compressor section 21 and the exhaust turbine section 22 (in the left-right direction).

[0025] The engine body 1 has a support portion SP that supports the supercharger 2. In this embodiment, the support portion SP is the intercooler 15 described above. The intercooler 15 is fixed to the cylinder block 12 as described above. Therefore, it can be said that the supercharger 2 is supported by the support portion SP provided on the cylinder block 12. Note that the support portion SP does not necessarily have to be the intercooler 15, and may be configured by another portion or member provided on the cylinder block 12 or the cylinder head 13.

[0026] More 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) that constitutes the intercooler 15. The supercharger support bracket 151 may be a separate member from the frame that constitutes the intercooler 15, or may be the same member as the frame.

[0027] As described above, since the turbocharger 2 has an intermediate support structure, the turbocharger support bracket 151 is connected to the bearing portion 24 in order to support the bearing portion 24 between the compressor portion 21 and the exhaust turbine portion 22. That is, the portion (main portion) of the turbocharger 2 made up of the compressor portion 21 and the exhaust turbine portion 22 is configured to be supported (fixed) at one point in the intermediate portion by the turbocharger support bracket 151. The main portion of the turbocharger 2 is configured to be supported by a seesaw (or balance balance)-like structure.

[0028] The turbocharger 2, whose support structure has the seesaw structure described above, is susceptible to vibration due to the influence of vibration from the engine body 1. Furthermore, a radial turbocharger having a configuration similar to that of the turbocharger 2 of this embodiment generally has a heavier rotating part and a shorter rotating shaft than an axial turbocharger having a layout in which the inflow direction of exhaust gas is the same as the turbine shaft, and therefore tends to vibrate more easily. In consideration of these points, the engine 100 of this embodiment is configured to include a dynamic vibration absorber (dynamic damper) 3 (see FIG. 3 described later) to suppress vibration of the turbocharger 2.

[0029] 3 is a front view schematically showing the configuration of an engine 100 equipped with a dynamic vibration absorber 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, it has been found that there are two natural frequencies in the engine 100 that need to be suppressed in order to suppress vibrations of the supercharger 2, and so the number of dynamic vibration absorbers 3 is set to two. However, the number of dynamic vibration absorbers 3 may be changed as appropriate depending on the number of natural frequencies to be suppressed in the engine 100. In other words, the number of dynamic vibration absorbers 3 equipped in the engine 100 may be one or more, as necessary.

[0030] In this embodiment, the support part SP has the dynamic vibration absorber 3, and the dynamic vibration absorber 3 is connected to the turbocharger 2 via the connecting part 4. That is, in this embodiment, the dynamic vibration absorber 3 provided on the support part SP, rather than on the turbocharger 2, is used to suppress vibration of the turbocharger 2. In such a configuration, the dynamic vibration absorber 3 does not need to be directly attached to the turbocharger 2, and therefore the possibility that the dynamic vibration absorber 3 will be exposed to hot air from the turbocharger 2 in particular can be reduced. This makes it possible to suppress deterioration of the members (e.g., rubber members, etc.) that constitute the dynamic vibration absorber 3. Since the dynamic vibration absorber 3, whose deterioration due to hot air is suppressed, can suppress vibration of the turbocharger 2, it is possible to appropriately suppress vibration over a long period of time using the dynamic vibration absorber 3.

[0031] Moreover, in this embodiment, the dynamic vibration absorber 3 is disposed below the turbocharger 2. Much of the hot air around the turbocharger 2 tends to flow above the turbocharger 2. For this reason, by disposing the dynamic vibration absorber 3 below the turbocharger 2, it is possible to reduce the possibility that the dynamic vibration absorber 3 will be exposed to hot air. In other words, it is possible to suppress deterioration of the members constituting the dynamic vibration absorber 3 due to hot air.

[0032] In this embodiment, the support part SP has a plurality of dynamic vibration absorbers 3. By providing a plurality of dynamic vibration absorbers 3 on the support part SP, it is possible to suppress vibrations resulting from a plurality of types of natural frequencies. And, because each dynamic vibration absorber 3 is provided on the support part SP, it is possible to suppress deterioration of each of the plurality of dynamic vibration absorbers 3 provided due to hot air. Moreover, because all of the plurality of dynamic vibration absorbers 3 are disposed below the turbocharger 2, it is also possible to suppress deterioration of the dynamic vibration absorbers 3 due to hot air from this point of view.

[0033] In detail, the support part SP has a dynamic vibration absorber mounting part 152 for mounting the dynamic vibration absorber 3. The connecting part 4 connecting the turbocharger 2 and the dynamic vibration absorber 3 includes a connecting member 41 connecting the exhaust turbine downstream passage part 23 and the dynamic vibration absorber mounting part 152. In this configuration, the dynamic vibration absorber 3 is disposed on the side (right side) of the exhaust turbine part 22 side in the left-right direction, rather than on the side (left side) of the compressor part 21 side of the turbocharger 2. The turbocharger 2 is configured so that the exhaust turbine part 22 side (right side) is heavier than the compressor part 21 side (left side). For this reason, in this embodiment, the dynamic vibration absorber 3 is disposed on the heavier side of the turbocharger 2, and the vibration suppression effect of the dynamic vibration absorber 3 can be more effectively exhibited.

[0034] More specifically, the intercooler 15 configured as the support portion SP has a first dynamic vibration absorber mounting portion 1521 to which the first dynamic vibration absorber 31 is attached, and a second dynamic vibration absorber mounting portion 1522 to which the second dynamic vibration absorber 32 is attached. The first dynamic vibration absorber mounting portion 1521 is made up of a plate-shaped member that extends rightward from a frame member (not shown) that constitutes the intercooler 15. The first dynamic vibration absorber 31 is disposed on the underside of the right end portion of the first dynamic vibration absorber mounting portion 1521. The second dynamic vibration absorber mounting portion 1522 is made up of a plate-shaped member that extends rightward from the 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 disposed on the underside of the right end portion of the second dynamic vibration absorber mounting portion 1522.

[0035] The connecting section 4 has a first connecting member 41 that connects the exhaust turbine downstream passage section 23 and the first dynamic vibration absorber mounting section 1521, and a second connecting member 42 that connects the first dynamic vibration absorber mounting section 1521 and the second dynamic vibration absorber mounting section 1522. The first connecting member 41 is erected on the upper surface of the plate-shaped first dynamic vibration absorber mounting section 1521, and its upper end is fixed to the right end of the exhaust turbine downstream passage section 23. The second connecting member 42 is erected on the upper surface of the plate-shaped second dynamic vibration absorber mounting section 1522, and its upper end is fixed to the lower surface of the first dynamic vibration absorber mounting section 1521. The connecting members 41, 42 may be fixed to each section using fasteners such as screws.

[0036] The first dynamic vibration absorber 31 is connected to the exhaust turbine downstream passage section 23 via a first dynamic vibration absorber mounting section 1521 and a first connecting member 41. The second dynamic vibration absorber 32 is connected to the exhaust turbine downstream passage section 23 via a second dynamic vibration absorber mounting section 1522, a second connecting member 42, the first dynamic vibration absorber mounting section 1521, and the first connecting member 41.

[0037] In this embodiment, as shown in FIG. 3 , the multiple dynamic vibration absorbers 3 are arranged at different height positions in the up-down direction. The multiple dynamic vibration absorbers 3 are arranged lined up above and below when viewed from the front. With this configuration, it is possible to prevent the width (length in the left-right direction) of the engine 100 from increasing compared to a configuration in which the multiple dynamic vibration absorbers 3 are arranged lined up in the left-right direction. Also, with this configuration, it is possible to prevent the depth (length in the front-to-rear direction) of the engine 100 from increasing compared to a configuration in which the multiple dynamic vibration absorbers 3 are arranged lined up in the front-to-rear direction. However, the present invention does not exclude a configuration in which the multiple dynamic vibration absorbers 3 are arranged lined up in the left-to-right direction or the front-to-rear direction, and these configurations may be adopted.

[0038] <3. Structure of dynamic vibration absorber> Next, we will explain the structure of the dynamic vibration absorber 3 provided in the engine 100. Fig. 4 is a schematic enlarged perspective view showing an enlarged portion of the engine 100 where the dynamic vibration absorber 3 is arranged. Note that in Fig. 1, the dynamic vibration absorber 3 is configured such that a cover member is attached and the inside cannot be seen, but Fig. 4 shows the dynamic vibration absorber 3 with the cover member removed.

[0039] 4, the first dynamic vibration absorber 31 attached to the first dynamic vibration absorber attachment portion 1521 and the second dynamic vibration absorber 32 attached to the second dynamic vibration absorber attachment portion 1522 are arranged in different orientations, but have the same basic structure. For this reason, the structure of the dynamic vibration absorber 3 will be described below using 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.

[0040] In this embodiment, the orientations of the first dynamic vibration absorber 31 and the second dynamic vibration absorber 32 differ by 90° in 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 be configured to differ by another angle from that in this embodiment.

[0041] FIG. 5 is a perspective view showing the general configuration of the first dynamic vibration absorber 31. Note that the viewing direction of FIG. 5 has been intentionally changed from that of FIG. 4 to make the configuration of the first dynamic vibration absorber 31 easier to understand. FIG. 4 is a view seen from diagonally above the right, and FIG. 5 is a view seen from diagonally above the left. As shown in FIG. 5, the first dynamic vibration absorber 31 (dynamic vibration absorber 3) has a first portion 3a and a second portion 3b. The first portion 3a and the second portion 3b are provided so as to be separable.

[0042] Fig. 6A is a perspective view showing a schematic configuration of the first portion 3a of the first dynamic vibration absorber 31. Fig. 6B is a perspective view showing a schematic configuration of the second portion 3b of the first dynamic vibration absorber 31. Figs. 6A and 6B are views showing the first dynamic vibration absorber 31 shown in Fig. 5 divided into the first portion 3a and the second portion 3b.

[0043] 6A and 4, the first portion 3a (in other words, the dynamic vibration absorber 3) has a first dynamic vibration absorber frame 301 that is suspended from a dynamic vibration absorber mounting portion 152 (more specifically, a first dynamic vibration absorber mounting portion 1521) provided on the support portion SP and on which the elastic body EB is placed. The first dynamic vibration absorber frame 301 is U-shaped when viewed from the front.

[0044] In detail, the first dynamic vibration absorber frame 301 includes an elastic body mounting portion 3011 in the shape of a rectangular plate extending in the left-right direction. An elastic body EB is mounted on the upper surface of the elastic body mounting portion 3011 in a fixed state using fasteners such as screws. In this embodiment, a plurality of elastic bodies EB (specifically, three) are mounted on the elastic body mounting portion 3011, but this is merely an example. The elastic body mounting portion 3011 may be configured to mount only one elastic body EB or a plurality of elastic bodies EB other than three. A detailed example of the elastic body EB is a rubber member.

[0045] The first dynamic vibration absorber frame 301 also includes a pair of mounting walls 3012 erected on both left-right (longitudinal) end portions of the elastic body mounting portion 3011. Each of the pair of mounting walls 3012 is fixed to the lower surface of the first dynamic vibration absorber mounting portion 1521 using fasteners such as screws, with the upper surface thereof disposed opposite the lower surface of the first dynamic vibration absorber mounting portion 1521. The pair of mounting walls 3012 are fixed to the first dynamic vibration absorber mounting portion 1521 in a state in which the first portion 3a and the second portion 3b are combined (the state shown in FIG. 5).

[0046] 6B and 4, the second portion 3b (in other words, the dynamic vibration absorber 3) has a second dynamic vibration absorber frame 302 that is supported by the first dynamic vibration absorber frame 301 via an elastic body EB and suspends the weight WT. The second dynamic vibration absorber frame 302 has an inverted U-shape in side view. That is, the second dynamic vibration absorber frame 302 is upside down compared to the first dynamic vibration absorber frame 301, and the direction of the U-shape is shifted by 90 degrees.

[0047] In detail, the second dynamic vibration absorber frame 302 includes a mounting plate portion 3021 in the shape of a rectangular plate extending in the front-rear 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 mounting portion 3011. With the mounting plate portion 3021 placed on the elastic body EB, it is fixed to the elastic body EB using fasteners such as screws. In this embodiment, since a plurality of elastic bodies are placed on the elastic body mounting portion 3011, the mounting plate portion 3021 is fixed to each of the plurality of elastic bodies EB.

[0048] The second dynamic vibration absorber frame 302 also includes a pair of weight support portions 3022 extending downward from both ends of the mounting plate portion 3021 in the front-rear direction (longitudinal direction). The front weight support portion 3022 of the pair of weight support portions 3022 supports the front end of the weight WT, which has a rectangular plate shape and extends in the front-rear direction. The rear weight support portion 3022 of the pair of weight support portions 3022 supports the rear end of the weight WT, which has a rectangular plate shape and extends in the front-rear direction. In detail, the front and rear ends of the weight WT are fixed to the pair of weight support portions 3022 with screws, so that the weight WT is suspended from the pair of weight support portions 3022.

[0049] In this embodiment, the weight WT is configured by stacking multiple weight pieces WP in the vertical direction, but this is merely an example. The weight WT may be configured as a single block. Furthermore, when the weight WT is configured from weight pieces WP, it may be configured from only one weight piece WP. In this embodiment, the multiple weight pieces WP stacked in the vertical direction are fixed together to a pair of weight support parts 3022 by screws.

[0050] In this way, by configuring the first dynamic vibration absorber frame 301 and the second dynamic vibration absorber frame 302 separately, it is possible to easily adjust the weight of the weight WT by the second dynamic vibration absorber frame 302. Furthermore, when replacing the elastic body EB, the elastic body EB can be easily replaced by removing only the second part 3b.

[0051] 7 is a front view showing the schematic configuration of a first dynamic vibration absorber 31A according to a modified example. The configuration according to the modified example is also applicable to the second dynamic vibration absorber 32 according to the embodiment described above. The first dynamic vibration absorber 31A according to the modified example is generally similar in configuration to the first dynamic vibration absorber 31 according to the embodiment described above, but differs in that a third dynamic vibration absorber frame 303 is added.

[0052] The third dynamic vibration absorber frame 303 has an S-shape when viewed from the front. In detail, the third dynamic vibration absorber frame 303 has a first flat plate portion 3031, a flat plate portion connecting portion 3032, and a second flat plate portion 3033.

[0053] The first flat plate portion 3031 is a rectangular plate extending in the front-rear direction. The first flat plate portion 3031 is fixed to the elastic body mounting portion 3011 with fasteners such as screws, with the upper surface facing the lower surface of the elastic body mounting portion 3011. In other words, the third dynamic vibration absorber frame 303 is suspended from the first dynamic vibration absorber frame 301.

[0054] The flat plate portion connecting portion 3032 connects the first flat plate portion 3031 and the second flat plate portion 3033. The flat plate portion connecting portion 3032 is in the shape of a rectangular plate, and extends downward from the lower end of the first flat plate portion 3031. The flat plate portion connecting portion 3032 extends downward to a position that is lower than the lower end of the weight WT that is suspended by the second dynamic vibration absorber frame 302.

[0055] The second flat plate portion 3033 extends leftward from the lower end of the flat plate portion connecting portion 3032. The second flat plate portion 3033 is a rectangular plate extending in directions parallel to the left-right and front-rear directions. In a plan view, the second flat plate portion 3033 overlaps with the weight WT and has an area equal to or greater than that of the weight WT. A gap is formed between the second flat plate portion 3033 and the weight WT in the vertical direction. In this embodiment, the weight WT is screwed to the second dynamic vibration absorber frame 302, and a portion of the screw protrudes downward from the weight WT. A gap is formed between the protruding portion of the screw and the second flat plate portion 3033 in the vertical direction.

[0056] When the third dynamic vibration absorber frame 303 as described above is provided, for example, the replacement work of the elastic body EB can be carried out easily. More specifically, in order to replace the elastic body EB, before removing the second dynamic vibration absorber frame 302 from the elastic body EB, the weight WT that is fixed with screws is removed from the second dynamic vibration absorber frame 302. The removed weight WT is then placed on the third dynamic vibration absorber frame 303. In this way, the replacement work of the elastic body EB can be carried out without the trouble of moving the heavy weight WT to another location, making the replacement work easier for the person performing the work.

[0057] <4. Things to keep in mind> Various modifications can be made to the various technical features disclosed in this specification without departing from the spirit of the technical creation. Furthermore, multiple embodiments, examples, and modifications shown in this specification can be combined to the extent possible.

[0058] <5. Notes> An exemplary engine of the present invention may be an engine comprising an engine body and a supercharger, wherein the engine body has a support part that supports the supercharger, the support part has a dynamic vibration absorber, and the dynamic vibration absorber is connected to the supercharger via a connecting part (first configuration).

[0059] In the engine of the first configuration, the dynamic vibration absorber may be arranged below the supercharger (second configuration).

[0060] In the engine of the first or second configuration, the turbocharger may have an exhaust turbine section connected to an exhaust passage section provided in the engine body, and an exhaust turbine downstream passage section connected to the exhaust outlet of the exhaust turbine section, the support section has a dynamic vibration absorber mounting section for mounting the dynamic vibration absorber, and the connecting section may be configured to include a connecting member connecting the exhaust turbine downstream passage section and the dynamic vibration absorber mounting section (third configuration).

[0061] In the engine of any one of the first to third configurations, the support portion may have a configuration (fourth configuration) including a plurality of the dynamic vibration absorbers.

[0062] In the engine of the fourth configuration, the plurality of dynamic vibration absorbers may be arranged at different height positions in the up-down direction (fifth configuration).

[0063] In an engine of any of the above first to fifth configurations, the dynamic vibration absorber may be configured (sixth configuration) to have a first dynamic vibration absorber frame that is suspended from a dynamic vibration absorber mounting portion provided on the support portion and on which an elastic body is placed, and a second dynamic vibration absorber frame that is supported by the first dynamic vibration absorber frame via the elastic body and suspends a weight. [Explanation of symbols]

[0064] 1. Engine body 2. Turbocharger 3...Dynamic vibration absorber 4...Connection part 15. Intercooler (support part) 22 Exhaust turbine section 23. Exhaust turbine downstream passage 31, 31A...1st dynamic vibration absorber 32...Second dynamic vibration absorber 100···Engine 152 Dynamic vibration absorber mounting part 301···First dynamic vibration absorber frame 302 Second dynamic vibration absorber frame 1521···First dynamic vibration absorber mounting part 1522···Second dynamic vibration absorber mounting part EB...Elastic body SP...Support part WT... Weight

Claims

1. An engine comprising an engine body and a supercharger, the engine body has a support portion that supports the supercharger, the support portion has a dynamic vibration absorber, The dynamic vibration absorber is connected to the turbocharger via a coupling portion.

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

3. The turbocharger is an exhaust turbine section connected to an exhaust passage section provided in the engine body; an exhaust turbine downstream passage section connected to an exhaust outlet of the exhaust turbine section; and the support portion has a dynamic vibration absorber mounting portion for mounting the dynamic vibration absorber, 3. The engine according to claim 1, wherein the connecting portion includes a connecting member that connects the exhaust turbine downstream passage portion and the dynamic vibration absorber 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 at different height positions in the up-down direction.

6. The dynamic vibration absorber is a first dynamic vibration absorber frame suspended from a dynamic vibration absorber mounting portion provided on the support portion and on which an elastic body is placed; a second dynamic vibration absorber frame that is supported by the first dynamic vibration absorber frame via the elastic body and that suspends a weight; 10. The engine of claim 1, wherein:

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