JP2018059467A - Engine with exhaust turbo supercharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine with exhaust turbo supercharger capable of reducing suction noises even when a supercharging performance is improved.SOLUTION: An engine with an exhaust turbo supercharger comprises an engine body, an exhaust turbo supercharger, and an intake pipe 12. One end opening 12a of the intake pipe 12 is connected to a compressor. The intake pipe 12 has a curve part 12c formed by curving a pipe shaft on one side opening 12a connected to the compressor. Plural intake resonators 12f, 12g are provided at the curve part 12c. Each of the intake resonators 12f, 12g is formed to project outside the intake pipe 12 in a radial direction so as to have a recess part continued to a space in a pipe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an engine with an exhaust turbocharger, and more particularly to a structure of an intake pipe that is an air supply passage to a compressor of an exhaust turbocharger.

  Conventionally, exhaust turbochargers have been installed to increase engine output. The exhaust turbocharger includes a turbine section having a turbine that is driven by the energy of exhaust gas that passes through the exhaust passage, and a compressor that is driven by the turbine and pressurizes the air in the intake passage.

  Here, research and development for suppressing intake noise such as surge noise in an intake system has been made on an engine with an exhaust turbocharger (Patent Document 1). Patent Document 1 discloses a technique in which a side branch type resonance chamber having a spring made of a shape memory alloy is provided in an intake pipe.

Japanese Utility Model Publication No. 63-136257

  However, in an engine equipped with an exhaust turbocharger, when further improvement of the supercharging performance is to be achieved, the conventional technology including the technology disclosed in Patent Document 1 generates intake noise such as surge noise in the intake system. It may be difficult to suppress the above.

  Specifically, when the compressor blades are increased in size or changed in shape in order to improve the supercharging performance of the exhaust turbocharger, intake noise in a high frequency region is generated.

  The present invention has been made to solve such a problem, and provides an engine with an exhaust turbocharger that can reduce intake noise even when the supercharging performance is improved. For the purpose.

  An engine with an exhaust turbocharger according to an aspect of the present invention includes an engine body, an exhaust turbocharger, and an intake pipe.

  The exhaust turbocharger has a compressor that pressurizes intake air and supplies the compressed air to the engine body by the energy of exhaust gas from the engine body.

  The intake pipe is arranged upstream of the compressor in the air supply path to the compressor, and one end side opening is connected to the compressor.

  In the engine with an exhaust turbocharger according to this aspect, the intake pipe is a portion that continues from the opening on the one end side, and is provided with a curved portion having a curved tube axis, and the curved portion, And a plurality of intake resonators configured to have recesses that are continuous in the space.

  First, in order to improve the turbocharging performance of an exhaust turbocharger, if the blades of the compressor are increased in size or the shape is changed, a large turbulence of airflow occurs on the compressor blade surface, and the compressor intake air A large pressure fluctuation occurs in the mouth. This pressure fluctuation collides with the curved portion of the intake pipe.

  In the engine with an exhaust turbocharger according to this aspect, since a plurality of intake resonators are provided in the curved portion of the intake pipe, even when a pressure fluctuation collides with the curved portion as described above, a radiated sound (intake noise) ) Can be reliably suppressed. This is because each of the plurality of intake resonators functions as a resonator and also functions as a reinforcing portion for increasing rigidity in the curved portion.

  Therefore, in the engine with an exhaust turbocharger according to this aspect, intake noise can be reduced even when the supercharging performance is improved.

  An engine with an exhaust turbocharger according to another aspect of the present invention has the above-described configuration, wherein an inner diameter of the concave portion in each of the plurality of intake resonators is 80% to 100% with respect to a pipe inner diameter in the curved portion. .

  In the engine with an exhaust turbocharger according to this aspect, the inner diameter of the recess in each of the plurality of intake resonators is substantially equal (80% to 100%) with the inner diameter of the tube in the curved portion. Thereby, a high silencing effect can be obtained in each intake resonator.

  In the engine with an exhaust turbocharger according to another aspect of the present invention, in the above configuration, each of the plurality of intake resonators has a resonance frequency of 2000 Hz to 3500 Hz.

  In the engine with an exhaust turbocharger according to this aspect, each intake resonator is configured with the secondary resonance frequency for high-frequency intake noise of 4000 Hz to 7000 Hz due to the increase in size and shape of the compressor blades. Yes. Therefore, the generation of such high-frequency intake noise can be effectively suppressed.

  In an engine with an exhaust turbocharger according to another aspect of the present invention, in the above-described configuration, each of the plurality of intake resonators protrudes to any side of the curved portion except for the inner peripheral side of the curved portion. It is configured.

  As described above, even when a large pressure fluctuation occurs at the compressor inlet due to an increase in the size or shape of the compressor blades, the inner circumference of the curved portion of the intake pipe where the pressure fluctuation collides Since each intake resonator is formed by projecting to any side except the side, it is possible to effectively mute the radiated sound (intake noise) associated with the pressure fluctuation collision.

  An engine with an exhaust turbocharger according to another aspect of the present invention is configured in such a manner that each of the plurality of intake resonators projects to the outer peripheral side of the curved portion.

  In the engine with an exhaust turbocharger according to this aspect, since the intake resonator is configured to project to the outer peripheral side of the curved portion of the intake pipe, the intake noise can be more effectively silenced. That is, it is possible to effectively mute the sound by providing the intake resonator on the outer peripheral side of the curved portion where the pressure fluctuation directly collides.

  In an engine with an exhaust turbocharger according to another aspect of the present invention, in the above configuration, the engine body includes an engine head and an engine block joined to the engine head, and the engine block includes the engine block. When it is assumed that the engine head is located on the lower side in the first direction, each of the plurality of intake resonators is configured to project to the lower side in the first direction at the bending portion.

  In the engine with an exhaust turbocharger according to this aspect, since the intake resonator is configured by projecting to the lower side in the first direction of the curved portion in the intake pipe, it becomes an obstacle to the arrangement of the functional units around the engine. Therefore, it is possible to mute the intake noise.

  In an engine with an exhaust turbocharger according to another aspect of the present invention, in the above-described configuration, the intake pipe has a plurality of constituent members joined together, and butts of the side edges of the plurality of constituent members are along the pipe axis. Each of the plurality of intake resonators is configured to straddle at least two of the plurality of component members. In other words, the dividing line between the plurality of constituent members in the intake pipe extends along the pipe axis, and the dividing line crosses the intake resonator.

  In the engine with an exhaust turbocharger according to this aspect, since each intake resonator is configured in a state of straddling two components, it is easy to manufacture the intake pipe and reduce the manufacturing cost. Can do.

  An engine with an exhaust turbocharger according to another aspect of the present invention has the above-described configuration, wherein the engine body includes an engine head and an engine block joined to the engine head, and the engine head side. When viewed from above, the curved portion of the intake pipe takes the following arrangement with respect to the engine body.

  When viewed from above, the exhaust turbocharger is disposed at a corner portion on one side of the engine body, and the curved portion of the intake pipe extends from the one side along the outside of the corner portion. It is curved.

  In the engine with an exhaust turbocharger according to this aspect, the intake pipe is configured to bend immediately from one end side opening that is a connection portion with the exhaust turbocharger. Even in such a configuration, the intake noise can be reduced by the arrangement of the intake resonator as described above.

  In an engine with an exhaust turbocharger according to another aspect of the present invention, the intake pipe is configured by using a resin material.

  In the engine with an exhaust turbocharger according to this aspect, since the intake pipe is made of a resin material, the weight can be reduced and the manufacturing cost can be reduced. When the intake pipe is made of a resin material, the intake pipe may be less rigid than the metal pipe. On the other hand, in the engine with an exhaust turbocharger according to this aspect, by providing a plurality of intake resonators in the curved portion of the intake pipe, the rigidity in the curved portion can be improved, and the noise of the intake noise is silenced. Effectively.

  In the engine with an exhaust turbocharger according to each of the above aspects, intake noise can be reduced even when the supercharging performance is improved.

1 is a schematic plan view showing a partial configuration of an engine 1 with an exhaust turbocharger according to an embodiment. It is a model side view which shows the structure of the intake pipe 12 in the engine 1 with an exhaust turbo supercharger. It is a model bottom view which shows the structure of the intake pipe 12 in the engine 1 with an exhaust turbo supercharger. It is a model front view which shows the structure of the intake pipe 12 in the engine 1 with an exhaust turbo supercharger. FIG. 5 is a diagram illustrating a VV cross section of FIG. 3, and a schematic cross sectional view illustrating a configuration of a resonator unit 12 f in the intake pipe 12.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The form described below is one embodiment of the present invention, and the present invention is not limited to the following form except for the essential configuration.

1. Schematic Configuration of Engine 1 with Exhaust Turbocharger The schematic configuration of the engine 1 with an exhaust turbocharger according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, the engine 1 with an exhaust turbocharger includes an engine body 10, an exhaust turbocharger 11, and an intake pipe 12.

  In the present embodiment, the engine body 10 is a multi-cylinder diesel engine.

  The exhaust turbocharger 11 includes a compressor 11a and a turbine unit 11b. The exhaust gas turbocharger 11 is supplied with the exhaust gas of the engine body 10 to the turbine portion 11b, and the turbine housed therein is driven by the energy of the exhaust gas.

  The compressor 11 a of the exhaust turbocharger 11 has blades (compressor impellers) that are driven as the turbine is driven, pressurizes the air supplied through the intake pipe 12, and enters the combustion chamber of the engine body 10. Supply.

  As shown in FIG. 1, the exhaust turbocharger 11 according to the present embodiment is disposed near a corner on one side of the engine main body 10 (one side of the exhaust side) when viewed from above, and the intake air of the compressor 11a The mouth is facing the outside of the corner.

  The intake pipe 12 according to the present embodiment is made of a resin material (for example, a nylon-based resin material containing a reinforcing material), and one end side opening is connected to the compressor 11 a of the exhaust turbocharger 11.

2. Configuration of Intake Pipe 12 The configuration of the intake pipe 12 will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the intake pipe 12 has a curved portion 12c, a second curved portion 12d, and a straight extension portion 12e successively arranged from the one end side opening 12a toward the other end side opening 12b. It is provided in the state.

  As shown in FIG. 4, in the bending portion 12c, the tube axis is bent approximately 90 ° from the X direction toward the Z direction immediately from the one end side opening 12a. Further, in relation to the engine body 10, the curved portion 12 c of the intake pipe 12 is curved along the outside of the corner portion of the engine body 10 in a top view as shown in FIG. 1.

  As shown in FIG. 2, the second bending portion 12d is continuous with the bending portion 12c, and the tube axis is bent toward the X direction.

  As shown in FIG. 2, the straight extension portion 12e is continuous with the second bending portion 12d, and the tube axis is extended along the X direction. In other words, as shown in FIG. 1, the straight extension portion 12 e is extended along the side portion of the engine body 10.

  Further, as shown in FIGS. 2 to 4, in the intake pipe 12 according to the present embodiment, two intake resonators 12f and 12g are provided in the bending portion 12c. Each of the two intake resonators 12f and 12g is provided so as to protrude from the lower surface in the Z direction of the bending portion 12c. Here, “below in the Z direction” is a direction in which the engine block is located with respect to the engine head of the engine body 10.

  As shown in FIG. 3, each of the intake resonators 12f and 12g has a circular shape in plan view from the lower side in the Z direction. In the intake pipe 12 according to the present embodiment, the intake resonator 12f and the intake resonator 12g are formed in the same shape and size.

  Here, as indicated by a dotted line in FIG. 3, the intake pipe 12 is formed by joining two components. The dotted line in FIG. 3 is a butt line (split line) between the sides of the two constituent members. A butt line (secant) between the two joining members extends along the pipe axis of the intake pipe 12.

  As shown in FIG. 3, the butting line (joining line) between the sides of the two joining members crosses substantially the center of the intake resonators 12f and 12g. In other words, each of the intake resonators 12f and 12g is configured in a state of straddling the two constituent members constituting the intake pipe 12. The reason why the joint line crosses the approximate center of the intake resonators 12f and 12g in this way is for ease of manufacture and to reduce manufacturing costs.

  In the present embodiment, the intake pipe 12 is shaped as shown in FIGS. 2 to 4 in order to avoid interference with other members around the engine body 10.

3. Configuration of Intake Resonators 12f and 12g The configuration of the intake resonators 12f and 12g in the intake pipe 12 will be described with reference to FIG. FIG. 5 shows a part of the curved portion 12c in the intake pipe 12 and the intake resonator 12f taken out. As described above, since the intake resonator 12f and the intake resonator 12g have substantially the same shape and size, only the intake resonator 12f will be described below.

  As shown in FIG. 5, the intake resonator 12f is configured such that a part of the wall surface of the curved portion 12c projects outward in the radial direction. As a result, a recess 12 i communicating with the in-pipe space 12 h of the intake pipe 12 is formed in the intake resonator 12 f.

Although detailed illustration is omitted in FIG. 5, the recess 12 i is a space having a substantially circular cross section. Then, the inner tube diameter of the curved portion 12c and _{D 12h,} when the inner diameter of the recess 12i and _{D 12i,} satisfy the following relationship.

[ _Expression 1] 70% ≦ (D _12i / D _12h ) ≦ 90%
In the present embodiment, the cross-sectional size of the recess 12i is substantially the same in the depth direction. However, it is also possible to set it as the recessed part from which cross-sectional size differs in the depth direction. For example, a concave portion whose cross-sectional size gradually decreases from the opening toward the bottom portion, or conversely, a concave portion whose cross-sectional size gradually increases from the opening toward the bottom portion can be used. Furthermore, it can also be set as the recessed part of the structure which a thin pipe | tube is connected with respect to the internal space 12h, and the cavity part with a large cross-sectional size connects with the bottom part of the said pipe | tube.

Returning to FIG. 5, the depth L _12i of the recess 12 i is set so that the resonance frequency is 2000 Hz to 3500 Hz. That is, in this embodiment, the frequency of the radiated sound (intake noise) generated when the pressure fluctuation generated at the compressor inlet collides with the curved portion 12c is assumed to be 4000 Hz to 7000 Hz. In contrast, the depth L _12i of the recess 12i in the intake resonators 12f and 12g is set to 2000 Hz to 3500 Hz which is effective at the primary resonance frequency.

Specifically, the depth L _12i of the recess 12i is set to ¼ of the wavelength λ calculated from the primary resonance frequency. That is, it is calculated based on the following mathematical formula.

[ _Formula 2] L _12i = λ / 4 = v / 4f
In the above equation, the wave propagation velocity v is 340 m / sec. (= 340 × 10 ³ mm / sec.).

  For example, at a frequency f = 2000 Hz, λ / 4 = 42.5 mm, and at a frequency f = 3500 Hz, λ / 4≈24.3 mm.

In the present embodiment, the reason why the depth L _12i of the concave portion 12i is not set based on the frequency of the radiated sound (intake noise) is considered that the depth L _12i becomes too shallow and it is difficult to obtain a silencing effect. Because. Specifically, at the primary resonance frequency f = 4000 Hz, λ / 4≈21.3 mm, and at the primary resonance frequency f = 7000 Hz, λ / 4≈12.1 mm. Therefore, the depth L _12i of the concave portion 12i becomes hardly ensured, it is believed that becomes difficult to obtain a silencing effect.

  In view of this, since the effect is reduced when the secondary resonance frequency is muted from 4000 Hz to 7000 Hz, the effect is enhanced by providing two intake resonators of the same size (the same primary resonance frequency).

4). Effect The engine 1 with an exhaust turbocharger having the above configuration can exhibit the following effects.

  In the engine 1 with the exhaust turbocharger, since the two intake resonators 12f and 12g are provided in the curved portion 12c of the intake pipe 12, even when a pressure fluctuation collides with the curved portion 12c, radiated sound (intake noise) Can be reliably suppressed. This is because the two intake resonators 12f and 12g each function as a resonator and also function as a reinforcing portion for increasing rigidity in the bending portion 12c.

  Therefore, in the engine 1 with the exhaust turbocharger according to the present embodiment, it is possible to reduce the intake noise even when the supercharging performance is improved.

In the engine 1 with the exhaust turbocharger according to the present embodiment, the inner diameter D12i of the recess 12i in each of the two intake resonators 12f and 12g is set so as to satisfy the above [ _Equation 1]. That is, the inner diameter D _12i of the recess 12i in each of the intake resonators 12f and 12g is substantially equal to the inner diameter D _12h of the tube 12c in the bending portion 12c. Thereby, the high silencing effect in each of the intake resonators 12f and 12g can be obtained.

In the engine 1 with the exhaust turbocharger according to the present embodiment, the depth L of the recess 12i is set so that each of the two intake resonators 12f and 12g has a primary resonance frequency in the range of 2000 Hz to 3500 Hz. _12i is set. In other words, in the engine 1 with the exhaust turbo supercharger, the intake resonators 12f and 12g with the secondary resonance frequency with respect to the high frequency intake noise of 4000 Hz to 7000 Hz due to the increase in size and shape of the blades of the compressor 11a. Is configured. Therefore, in the engine 1 with the exhaust turbocharger, the generation of such high-frequency intake noise can be effectively suppressed.

  Further, in the engine 1 with the exhaust turbocharger according to the present embodiment, the intake resonators 12f and 12g are formed by projecting to the lower side in the Z direction of the curved portion 12c in the intake pipe 12, and therefore, the curved inner side of the curved portion 12c. Compared with the case where it provides in, it can aim at silencing of intake noise more effectively.

  In addition, by providing the intake resonators 12f and 12g so as to project to the lower side in the Z direction of the curved portion 12c in this way, it is unlikely to become an obstacle to the arrangement of other components arranged around the engine body 10.

  In addition, since the intake pipe 12 of the engine 1 with the exhaust turbocharger according to the present embodiment is configured to straddle the two constituent members that constitute the intake pipe 12, the manufacture of the intake pipe 12 is performed. This is easy, and the manufacturing cost can be reduced.

  In addition, since the intake pipe 12 of the engine 1 with an exhaust turbocharger according to the present embodiment is configured using a resin material, the weight can be reduced as compared with a case where a metal material is used. The manufacturing cost can be reduced.

  When the intake pipe 12 is made of a resin material, it is conceivable that the rigidity of the intake pipe 12 is lower than that of a metal material. By providing the intake resonators 12f and 12g, the rigidity of the curved portion can be improved, and intake noise can be effectively silenced.

[Modification]
In the above embodiment, the two intake resonators 12f and 12g are provided in the curved portion 12c of the intake pipe 12, but the present invention is not limited to this. For example, three or more intake resonators may be provided around the curved portion 12c and its periphery. Moreover, it is good also as providing an intake resonator not only in the curved part 12c but in the 2nd curved part 12d, the straight extension part 12e, etc. FIG.

  In addition, in the intake pipe 12 according to the above-described embodiment, the intake resonators 12f and 12g projecting downward in the Z direction in the curved portion 12c are provided. However, in the present invention, the projecting direction is limited thereto. is not. For example, it is good also as providing the intake resonator protruding over the curved outer periphery of the curved part 12c. In this way, if the intake resonator extending over the curved outer periphery of the curved portion 12c is provided, the intake resonator can be provided in the portion where the pressure fluctuation generated at the intake port of the compressor 11a directly collides, and the intake noise is reduced. Generation | occurrence | production can be suppressed more effectively.

  As for the formation of the intake resonator, it is desirable to project it to the side excluding the curved inner periphery of the curved portion 12c in order to obtain a silencing effect.

  In the engine 1 with an exhaust turbocharger according to the above embodiment, the two intake resonators have the same shape and size, but the present invention is not limited to this. For example, if a plurality of intake resonators having different recess depths are provided, intake noise can be suppressed in a wide frequency range. Also, the cross-sectional size of the recess is not necessarily the same among the plurality of intake resonators, and may be different from each other.

  In the engine 1 with the exhaust turbocharger according to the above embodiment, the recess 12i of the intake resonators 12f and 12g has a circular cross-sectional shape. However, the present invention is not limited to this. Absent. For example, an oval shape, an elliptical shape, or a polygonal shape can be used.

  Moreover, in the engine 1 with the exhaust turbocharger according to the above embodiment, a diesel engine is adopted as the engine body 10, but the present invention is not limited to this. For example, a gasoline engine can be employed.

  In addition, the intake pipe 12 of the engine 1 with an exhaust turbocharger according to the above-described embodiment is configured by the three portions of the bending portion 12c, the second bending portion 12d, and the straight extension portion 12e. The invention can be modified as appropriate according to the shape of the engine body 10 and the arrangement of surrounding components.

  In the engine 1 with an exhaust turbocharger according to the above embodiment, the intake pipe 12 is made of a resin material. However, the present invention is not limited to this. For example, the intake pipe 12 may be configured using a metal material. In this way, even when the intake pipe is configured using a metal material, it is conceivable that intake noise occurs when it is necessary to reduce the thickness. In such a case, the same action and effect can be obtained if a plurality of intake resonators are provided in the bending portion as in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Engine with exhaust turbocharger 10 Engine main body 11 Exhaust turbocharger 11a Compressor 11b Turbine part 12 Intake pipe 12a One end side opening 12b Other end side opening 12c Curved part 12f, 12g Intake resonator 12i Recessed part

Claims (9)

The engine body,
An exhaust turbocharger having a compressor that pressurizes intake air and supplies the compressed air to the engine body by energy of the exhaust gas from the engine body;
In the air supply path to the compressor, the intake pipe is arranged upstream of the compressor, and one end side opening is connected to the compressor;
With
The intake pipe is a portion following the opening on the one end side, and is provided with a curved portion having a curved tube axis and a plurality of concave portions each provided in the curved portion, each of which is continuous with the space in the tube. An intake resonator of
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to claim 1,
The inner diameter of the concave portion in each of the plurality of intake resonators is 70% to 90% with respect to the inner diameter of the tube in the curved portion.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to claim 1 or 2,
Each of the plurality of intake resonators has a resonance frequency of 2000 Hz to 3500 Hz.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 3,
Each of the plurality of intake resonators is configured to project to any side except the inner peripheral side of the bending portion in the bending portion.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 4,
Each of the plurality of intake resonators is configured to project to the outer peripheral side of the curved portion,
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 4,
The engine body includes an engine head and an engine block joined to the engine head,
When it is assumed that the engine block is located on the lower side in the first direction with respect to the engine head, each of the plurality of intake resonators is configured to project to the lower side in the first direction in the curved portion.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 6,
In the intake pipe, a plurality of constituent members are joined, and the sides of the plurality of constituent members are abutted along the pipe axis,
Each of the plurality of intake resonators is configured in a state straddling at least two of the plurality of components.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 7,
The engine body includes an engine head and an engine block joined to the engine head,
When viewed from above the engine head side,
The exhaust turbocharger is disposed at a corner portion on one side of the engine body,
The curved portion of the intake pipe is curved outward along the corner portion from the one side.
Engine with exhaust turbocharger. An engine with an exhaust turbocharger according to any one of claims 1 to 8,
The intake pipe is configured using a resin material,
Engine with exhaust turbocharger.

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