JP3967449B2 - Intake silencer for vehicles with turbo engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of an intake silencer for a vehicle equipped with a turbo engine provided to reduce supercharging sound generated during supercharging in the middle of an intake hose connecting an intake compressor and an intake manifold of a turbocharger.
[0002]
[Prior art]
Conventionally, as an intake silencer for a vehicle equipped with an engine with a turbo, for example, “B--” of “Introduction of New Model Car Change Manual (Supplement Edition II) Y33 Series” (June 1997: Issued by Nissan Motor Co., Ltd.) Those described on page 99 are known.
[0003]
In this conventional source, it is described as “The silencer is installed in the intake duct (made of rubber) between the outlet of the turbocharger compressor and the intercooler”, and only the appearance of the silencer is described as a drawing.
[0004]
As shown in FIG. 7, this silencer is attached to a cylindrical pipe-shaped inner pipe having a large number of holes in the center, and an outer periphery of the inner pipe, and a large-diameter portion is formed in the center. An outer case formed with a hose disconnection prevention bead, and a silencer chamber formed between the inner pipe and the large-diameter portion and communicating with the intake passage of the inner pipe through a number of holes. The coupling and fixing with the case is coupling and fixing by spot welding.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional intake silencer for a turbo-equipped vehicle, the coupling and fixing of the inner pipe and the outer case are performed by spot welding, which is a common technique employed in exhaust silencers and the like. Therefore, there are problems listed below.
[0006]
(1) By spot welding performed at a high temperature (about 3000 ° C.), as shown in FIG. 8, burrs with the molten base material adhering to the periphery of the welded portion and the molten base material from the welded portion become fine granular. Although spattering occurs as a result, it is difficult to deburr and remove spatter after welding, which increases the number of manufacturing steps.
[0007]
(2) Of the spatter generated by spot welding, the spatter remaining in the gap between the inner pipe and the outer case cannot be removed. Therefore, as shown in FIG. 8, after the engine is started, the gap, the muffler chamber, the hole, and the intake passage may pass, and spatter may enter the cylinder chamber of the engine, possibly damaging the engine components.
[0008]
The problem to be solved by the present invention is to provide an intake silencer for a vehicle equipped with an engine with a turbo that can reduce the number of manufacturing steps and prevent foreign matter from entering the engine.
[0009]
[Means for Solving the Problems]
(Solution 1)
Means for solving the above problem 1 (Claim 1) is provided with a turbocharger that rotates an exhaust turbine using exhaust energy from an engine, drives an intake compressor with this power, and precompresses intake air to the engine, An intake silencer provided to reduce supercharging noise generated during supercharging in the middle of an intake hose connecting the intake compressor and intake manifold of the turbocharger,
A cylindrical inner pipe with a large number of holes in the center,
An outer case that is attached to the outer periphery of the inner pipe, has a large diameter portion at the center, and has hose removal prevention beads at both ends,
Formed between the inner pipe and the large-diameter portion, and provided with a muffler chamber communicating with the intake passage of the inner pipe through a number of holes,
The inner pipe and outer case are coupled and fixed by a concave and convex fitting portion, and the concave and convex fitting portion is a fitting concave surface on the rising inner surface of the large diameter portion (30a) of the outer case (30). a bead or the second fitting portion by emboss of the inner pipe (20) to the recess-projection fitting (20f), characterized in that a (20f).
[0013]
(Solution 5)
Means for solving the above problem 5 (Claim 5) is the intake silencer of the turbocharged engine-equipped vehicle according to Claim 1,
The uneven fitting portion is characterized in that the rising inner surface of the large-diameter portion of the outer case is a fitting concave surface, and the second fitting portion is formed by a bead or emboss of an inner pipe that is unevenly fitted with this.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
[0015]
First, the configuration will be described.
[0016]
FIG. 1 is a half sectional view showing an intake silencer of a turbocharged engine-equipped vehicle according to the first embodiment, and FIG. 2 is a system diagram showing a turbocharged engine to which the intake silencer according to the first embodiment is applied.
[0017]
[Turbo engine system configuration]
In FIG. 2, A1 is an intake silencer, 1 is an engine, 2 is a turbocharger, 2a is an intake compressor, 2b is an exhaust turbine, 3 is an air cleaner, 4 is an intercooler, 5 is a catalyst, 6 is a muffler, and 7 is a first intake air. Hose, 8 is a second intake hose, 9 is a third intake hose, 10 is a throttle valve, 11 is an intake manifold, 12 is an exhaust manifold, 13 is a waste gate valve, 14 is a valve actuator, 15 is an exhaust tube, 16 is an injector It is.
[0018]
The turbocharger 2 uses the exhaust energy from the engine 1 to rotate the exhaust turbine 2b and drives the intake compressor 2a with this power to preload the intake air to the engine 1.
[0019]
The intake silencer A1 includes a first intake hose 7 and a second intake hose 8 upstream of the intercooler 4 among the intake hoses 7, 8, and 9 that connect the intake compressor 2a of the turbocharger 2 and the intake manifold 11. The high-frequency supercharging sound (supercharged airflow sound) generated during turbocharging is reduced.
[0020]
The waste gate valve 13 is a valve that is opened and closed by a valve actuator 14 that is operated by a pressure difference between the inlet and the outlet of the intake compressor 2a. By opening the valve, a part of the exhaust gas is bypassed without passing through the exhaust turbine 2b. Make sure that the intake pressure does not exceed the set value.
[0021]
[Intake silencer configuration]
In FIG. 1, A1 is an intake silencer, 20 is an inner pipe, 20a is a hole, 20b is a first bead fitting portion (uneven fitting portion), 20c is an intake passage, 30 is an outer case, 30a is a large diameter portion, 30b Is a hose removal prevention bead, 30c is a straight pipe part, 30d is a rising part, and 40 is a muffler chamber.
[0022]
The inner pipe 20 is in the form of a cylindrical pipe having a large number of holes 20a in the center, and the pipe inner surface space serves as an intake passage 20c.
[0023]
The outer case 30 is attached to the outer periphery of the inner pipe 20, has a large diameter portion 30a at the center, and has hose disconnection prevention beads 30b, 30b at both ends, and has a large diameter with the hose disconnection prevention beads 30b, 30b. Straight pipe parts 30c, 30c are formed between the part 30a, and the straight pipe parts 30c, 30c and the large diameter part 30a are continuous by the rising parts 30d, 30d.
[0024]
The muffler chamber 40 is formed between the inner pipe 20 and the large-diameter portion 30a of the outer case 30, and communicates with the intake passage 20c of the inner pipe 20 through a number of holes 20a.
[0025]
The inner pipe 20 and the outer case 30 are coupled and fixed by setting the inner surfaces of the hose disconnection prevention beads 30b and 30b of the outer case 30 to be concave fitting surfaces, and the first bead fitting portion 20b of the inner pipe 20 that is concavo-convexly fitted thereto. , 20b. And the 1st bead fitting part 20b, 20b of the inner pipe 20 overlaps the outer case 30 and the inner pipe 20 with which axial direction length is substantially the same length in two layers, and is hose removal prevention bead 30b, 30b. It is provided by simultaneous molding.
[0026]
Next, the operation will be described.
[0027]
[About supercharging action]
When the engine 1 is driven to rotate, the intake air that has passed through the air cleaner 3 is pressurized by the intake compressor 2a, and the first intake hose 7 → the intake silencer A1 → the second intake hose 8 → the intercooler 4 → the third. It passes through the intake hose 9 → throttle valve 10 → intake manifold 11 and is supplied to the cylinder chamber of the engine 1 as a mixture by fuel injection by the injector 16.
[0028]
The exhaust gas from the engine 1 flows through the exhaust manifold 12 to the exhaust turbine 2b, rotates the exhaust turbine 2b, and then passes through the exhaust tube 15 → the catalyst 5 → the muffler 6 and is discharged to the outside air.
[0029]
That is, the supercharging of the intake air to the engine 1 is performed by the turbocharger 2 that rotates the exhaust turbine 2b using the exhaust energy from the engine 1 and drives the intake compressor 2a with this power.
[0030]
[Reduction of supercharging noise by intake silencer]
Frequency of over-Kyuon occurring during turbocharger is reduced by the intake silencer A1 which is provided between the first intake hose 7 and the second intake hose 8.
[0031]
That is, intake air sent to the intake passage 20c from the first intake hose 7, enters the muffler chamber 40 from multiple holes 20a, reducing the pressure by expanding the volume in silencing chamber 40, further silencing chamber 40 There is interference of reflected waves from the inner wall. It exhibits a silencing effect of attenuating the supercharging sound due to this pressure drop and interference.
[0032]
[Combination and fixing of intake silencer components]
In manufacturing the intake silencer A1, the outer case 30 without the hose removal prevention beads 30b and 30b and the inner pipe 20 without the first bead fitting portions 20b and 20b are respectively formed. And the outer case 30 and the inner pipe 20 which set the axial direction length to substantially the same length are piled up into two layers, and bead molding is performed on both ends thereof.
[0033]
As a result, the inner pipe 20 is provided with the first bead fitting portions 20b and 20b, and the outer case 30 is provided with the hose disconnection prevention beads 30b and 30b by simultaneous molding, and the inner pipe 20 and the outer case 30 are provided. And the inner surfaces of the hose detachment prevention beads 30b, 30b of the outer case 30 as fitting concave surfaces, and are fixedly coupled and fixed by the first bead fitting portions 20b, 20b of the inner pipe 20 which is concavo-convexly fitted with the inner concave portions. become.
[0034]
Next, the effect will be described.
[0035]
(1) Since the coupling and fixing of the inner pipe 20 and the outer case 30 are coupled and fixed by concave and convex fitting, the deburring and spatter removal operations are not required and the number of manufacturing steps is reduced compared to the coupling and fixing by spot welding. In addition, since no spatter remains in the gap between the inner pipe and the outer case, it is possible to prevent foreign matter from entering the engine 1.
[0036]
(2) The inner pipe 20 and the outer case 30 are formed by the first bead fitting portions 20b and 20b of the inner pipe 20 which is fitted with concave and convex surfaces on the inner surfaces of the hose disconnection prevention beads 30b and 30b of the outer case 30. Since the hose removal prevention beads 30b and 30b that are originally formed in the outer case 30 are coupled and fixed, and the first bead fitting portions 20b and 20b are formed only in the inner pipe 20, the inner pipe 20 and The outer case 30 can be coupled and fixed by concave-convex fitting, the design of the outer case 30 does not need to be changed, and the appearance of the intake silencer A1 is not different from the conventional one.
[0037]
(3) The first bead fitting portions 20b and 20b of the inner pipe 20 are formed by superposing the outer case 30 and the inner pipe 20 having substantially the same length in the axial direction in two layers, and hose removal prevention beads 30b and 30b. Therefore, the number of manufacturing steps can be greatly reduced by one-time bead molding without positioning, and the product cost of the intake silencer A1 can be reduced.
[0038]
That is, the outer case 30 in which the hose disconnection prevention beads 30b and 30b are molded and the inner pipe 20 without the first bead fitting portions 20b and 20b are overlapped in two layers and bead-molded at both ends of the inner pipe 20. However, in this case, alignment work with the hose removal prevention beads 30b and 30b and two bead moldings are required.
[0039]
(Embodiment 2)
[0040]
As shown in FIG. 3, the intake silencer A2 according to the second embodiment includes a concave / convex fitting portion between the inner pipe 20 and the outer case 30, and hose removal prevention beads 30b and 30b and a large diameter portion 30a of the outer case 30. This is an example in which a case-side bead fitting portion 30e and a pipe-side bead fitting portion 20e that are concavo-convexly fitted to each other are formed by simultaneously forming at the position of the straight pipe portion 30c.
[0041]
In the second embodiment, the spot welded portion of the conventional intake silencer shown in FIG. 7 is replaced with the bead fitting portions 30e and 20e as it is, and no design change of the inner pipe 20 and the outer case 30 is required. Compared to the first embodiment, the material cost can be saved.
[0042]
(Embodiment 3)
The third embodiment is an intake silencer for a vehicle equipped with an engine with a turbo corresponding to the invention described in claim 1 .
[0043]
As shown in FIG. 4, the intake silencer A3 according to the third embodiment has a concave / convex fitting portion between the inner pipe 20 and the outer case 30 and an inner surface of the rising portions 30d and 30d of the large diameter portion 30a of the outer case 30. This is an example in which the fitting concave surfaces are formed as second bead fitting portions 20f and 20f of the inner pipe 20 which are concavo-convexly fitted thereto.
[0044]
The third embodiment is a concave / convex fitting utilizing the rising portions 30d, 30d originally formed in the outer case 30, and if the second bead fitting portion 20f is formed only in the inner pipe 20, the inner pipe 20 and the outer case are formed. 30 can be coupled and fixed by concavity and convexity, and the material cost can be saved as compared with the first embodiment.
[0045]
(Embodiment 4)
[0046]
As shown in FIGS. 5 and 6, the intake silencer A4 of the fourth embodiment has a concave and convex fitting portion between the inner pipe 20 and the outer case 30, and the hose removal prevention beads 30 b and 30 b of the outer case 30 and a large diameter. This is an example of a case-side embossed fitting portion 30g and a pipe-side embossed fitting portion 20g that are concavo-convexly fitted to each other by simultaneously forming at the position of the straight pipe portion 30c between the portion 30a.
[0047]
In the fourth embodiment, the spot welded portion of the conventional intake silencer shown in FIG. 7 is replaced with the embossed fitting portions 30g and 20g as it is, and the design change of the inner pipe 20 and the outer case 30 is not required. It can be manufactured by embossing easier than bead processing, and further, material costs can be saved as compared with the first embodiment.
[0048]
(Other embodiments)
In the first, second, and third embodiments, the example of the concave and convex bead fitting in which the concave and convex ridges are formed over the entire circumference as the concave and convex fitting structure has been shown. It is good also as an uneven | corrugated fitting structure by the fitting recessed part and fitting convex part by embossing to fit. For example, the bead fitting portion on the inner pipe side shown in FIGS. 1 and 4 is an embossed fitting portion.
[0049]
In the first, second, third, and fourth embodiments, the silencer chamber is a chamber formed by a hollow cylindrical space. However, the shape of the silencer chamber is different from that of the hollow cylinder, It may be an example of loading.
[0050]
【The invention's effect】
According to the first aspect of the present invention, a turbocharger is provided for rotating the exhaust turbine by utilizing exhaust energy from the engine, driving the intake compressor with this power, and preloading the intake air to the engine. An intake silencer provided in the middle of the intake hose that connects the intake compressor and intake manifold of the charger to reduce the supercharging noise that occurs during supercharging, and is in the shape of a cylindrical pipe with many holes in the center The inner pipe is attached to the outer circumference of the inner pipe, a large diameter portion is formed in the center, and an outer case in which hose removal prevention beads are formed at both ends, and is formed between the inner pipe and the large diameter portion, The air intake passage of the inner pipe is equipped with a muffler chamber that communicates through many holes, and the inner pipe and the outer case are connected and fixed. , Due to a coupling fixed by concave and convex engaging portion, there is an advantage that it is possible to provide an intake silencer for a turbo engine with equipped vehicle contamination to the engine is prevented with a reduction in manufacturing steps can be achieved.
[0054]
Further, a concave convex fitting portion, because the rising inner surface of the large diameter portion of the outer case and the fitting concave, and a second fitting portion by the bead or embossing of the inner pipe to be convex-concave engagement therewith, in addition to the above effects, If the second fitting portion is formed only on the inner pipe, the inner pipe and the outer case can be coupled and fixed by concave and convex fitting.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an intake silencer of a turbocharged engine-equipped vehicle according to a first embodiment;
FIG. 2 is a system diagram showing a turbo engine to which the intake silencer of the first embodiment is applied.
FIG. 3 is a half sectional view showing an intake silencer of a turbocharged engine-equipped vehicle according to a second embodiment.
FIG. 4 is a half sectional view showing an intake silencer of a turbocharged engine-equipped vehicle according to a third embodiment.
FIG. 5 is a half sectional view showing an intake silencer of a turbocharged engine-equipped vehicle according to a fourth embodiment.
6 is a cross-sectional view taken along a line B-B in FIG. 5 showing an intake silencer of a vehicle with an engine with a turbocharger according to a fourth embodiment.
FIG. 7 is a half cross-sectional view showing an intake silencer of a conventional turbocharged engine-equipped vehicle.
FIG. 8 is an enlarged cross-sectional view of a welded portion for explaining a problem caused by spot welding in an intake silencer of a conventional turbocharged engine-equipped vehicle.
[Explanation of symbols]
A1 Intake silencer 1 Engine 2 Turbocharger 2a Intake compressor 2b Exhaust turbine 3 Air cleaner 4 Intercooler 5 Catalyst 6 Muffler 7 First intake hose 8 Second intake hose 9 Third intake hose 10 Throttle valve 11 Intake manifold 12 Exhaust manifold 13 Waste gate Valve 14 Valve actuator 15 Exhaust tube 16 Injector 20 Inner pipe 20a Hole 20b First fitting portion (uneven fitting portion)
20c Intake passage 20e Pipe side bead fitting portion (concave / convex fitting portion)
20f 2nd bead fitting part (concave-concave fitting part)
20g Pipe side embossed fitting part (concave fitting part)
30 Outer case 30a Large diameter part 30b Hose removal prevention bead 30c Straight pipe part 30d Standing part 30e Case side bead fitting part (concave fitting part)
30g Case-side embossed fitting (uneven fitting)
40 Silence room

Claims (1)

A turbocharger (2) is installed to rotate the exhaust turbine (2b) using the exhaust energy from the engine (1) and drive the intake compressor (2a) with this power to preload the intake air to the engine (1). The turbocharger (2) is provided in the middle of the intake hoses (7) and (8) to connect the intake compressor (2a) and the intake manifold (11) to reduce the supercharging sound generated during supercharging. The intake silencer (A1) is a cylindrical pipe-shaped inner pipe (20) with a large number of holes (20a) in the center, and is attached to the outer periphery of the inner pipe (20), and has a large diameter in the center. Between the inner pipe (20) and the large diameter portion (30a), the outer case (30a) formed with the hose removal prevention beads (30b) and (30b) at both ends. The muffler chamber (40) that is formed and communicates with the intake passage (20c) of the inner pipe (20) through a number of holes (20a) The inner pipe (20) and the outer case (30) are coupled and fixed by a concave and convex fitting portion, and the concave and convex fitting portion is a large-diameter portion (30a ) of the outer case (30). the rising inner surface and the fitting concave), beads or the second fitting portion by emboss of the inner pipe (20) to the recess-projection fitting therewith (20f), a turbo engine with mounted vehicle, characterized in that a (20f) Intake silencer.

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