JPH11229893A - Sound insulation plate structure and sound insulation structure for engine using the sound insulation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound insulation plate structure comprised of a laminated structure body with a vacuum therein, and to provide a sound insulation structure for an engine using that sound insulation structure. SOLUTION: This sound insulation plate structure is comprised of a laminated structure body 10 on which a pair of metal plates 1, 2 and an intermediate member 3 are laminated. Both sides of the intermediate member 3 are connected to the metal plates 1, 2 by being baked thereto through a hard rubber material 5. The laminated structure body 10 is able to be molded into a predetermined shape by a press forming, and the clearance between edge portions of the metal plates 1, 2 is sealed with a sealing member. Further, cavities 8 which are communicated with each other are formed in the intermediate member 3 and are made virtually a vacuum. The intermediate member 3 is comprised of a porous plate made of the hard rubber material 5 and which has a cavity 8. In order to enhance the strength and hardness, carbon or ceramics is mixed into the hard rubber material 5 which constitutes the porous plate of the intermediate member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to, for example, light oil,
A sound-insulating plate structure for producing a sound-insulating cover for preventing noise generated by engines such as a vehicle engine, a power generating engine, and a cogeneration system using gas fuel, heavy oil, or the like, and the sound insulating plate structure are applied. The present invention relates to a sound insulation structure of an engine.

[0002]

2. Description of the Related Art In general, a diesel engine using fuel such as light oil is used as a cogeneration system or an engine for a vehicle, and there are many systems in which a generator is attached to the engine. Also, the noise level of a diesel engine is not easy to reduce because the pressure in the cylinder is high and the explosive load generated in the combustion chamber is large. Engines such as cogeneration systems and hybrid engines are often installed in urban areas or urban areas, or run in urban areas or urban areas.
When the cogeneration system is set in a predetermined place of a building such as a building, a problem of pollution such as noise and vibration occurs.

[0003] The cogeneration system and the power generation engine are stationary engines, and the emission of noise and vibration generated from the engine and the emission of exhaust gas are serious problems. In order to prevent the noise and vibration generated from the cogeneration system from dissipating, it is conceivable to install the cogeneration system underground. However, installation of the cogeneration system underground is difficult due to the installation cost and location. It is difficult, the cost is high, and its practical use is difficult.

When a large engine is mounted on a structure, vibrations generated from the engine are transmitted to the entire structure, and loud noise is generated at a location corresponding to the frequency. Extremely difficult. The noise generated by the engine is the noise of the radiated sound, which is the air vibration, and the noise that the engine vibration is transmitted as the vibration of the air. The vibration resonates with the structure and disperses the noise from inside to outside. Is done. Shielding plates are used to prevent noise generated by the engine. However, in order to effectively prevent noise, the sound source must be blocked by a heavy material or a partition wall combining gas and solid must be used. It is known to be used. That is, when the engine is sealed in a narrow space, reflection of sound waves, which is a cause of noise, is generated on the wall surface, and is amplified by resonance or the like, which may cause complicated vibration.

[0005]

Therefore, in order to cut off noise generated from the engine, a wall structure through which sound waves are supposed to penetrate is solid, and a laminated structure in which gas and solid are sequentially laminated. A laminated structure covered with a large material or a laminated structure in which the space between the wall surfaces is evacuated and the propagation of sound waves is blocked can be effectively blocked. The present inventor has developed a sound insulation structure for an engine from the above viewpoint, and has disclosed in Japanese Patent Application Nos.
No. 5457 and Japanese Patent Application No. 8-331443 were filed earlier.

The sound insulation structure for an engine disclosed in Japanese Patent Application No. 8-205457 has a power supply system mounted on a bogie to suppress vibration and noise generated from the engine, and a mounting base on which the engine and a generator are mounted. A trolley comprising tires and tires is installed on a base laid in a storage room at the installation location. The multi-wall body constituting the accommodation chamber is composed of a hollow metal housing, a rubber coating layer fixed to the inner surface of the metal housing, and a corrugated support incorporated in the metal housing. It is formed in a state.

The sound insulation structure of an engine disclosed in Japanese Patent Application No. 8-331443 is one in which an engine is installed in a storage room composed of multiple walls, and the multiple walls are made of a porous material having a vacuum layer. Structure made of synthetic resin or metal plate surrounding a porous plate made of steel or fibrous material, foamed structure made of foamed resin surrounding the hollow structure, heat-resistant glass placed on the side wall of the housing of the foamed structure It is composed of a sawtooth corrugated plate made of wool and a core material, and a concavo-convex plate made of a metal plate disposed on the outer wall surface of the housing of the foamed structure.

However, in the case of an engine such as a vehicle engine, it is most effective to employ a structure in which the engine itself is covered with a sound insulation cover in order to cut off generated noise. However, objects such as equipment attached to the engine are complicated. In order to shield them in the case of an unusual shape, the objects should be covered efficiently by the sound insulation cover.
It is necessary to form the sound insulation cover with a molding press or the like so as to minimize the gap between the sound insulation cover and the object.

When the engine is covered with the sound insulation cover, for example, in an engine incorporating a radiator for cooling the cooling water using running wind, the radiator is installed in front of the engine. It protrudes and becomes an obstacle when the radiator covers the engine with the sound insulation cover. In addition, if the exhaust manifold is wrapped around the sound insulating cover, there is a problem that the temperature inside the sound insulating cover rises too much.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a laminated structure which can be easily formed into various shapes by press working in consideration of the above and can be easily made into a vacuum or reduced pressure state. In addition, the laminated structure is formed into a sound-insulating cover that can cover the engine, and the noise generated from the engine is confined in the sound-insulating cover, so that the radiator does not need to be installed in front of the engine. An object of the present invention is to provide a sound insulation structure of an engine in which a sound insulation cover covers an engine other than a radiator and its attached parts and shuts off noise generated in the engine and the generator.

According to the present invention, a metal plate, which is spaced apart from and opposed to a metal plate, is supported at a predetermined distance between the metal plates, and both surfaces are bonded to the metal plate by hard rubber material. A laminated structure consisting of an intermediate member and
The laminated structure can be formed into a predetermined shape by press working, a gap between edges of the metal plate is sealed with a seal member, and a gap formed in the intermediate member and communicating with each other is substantially formed. The present invention relates to a sound insulating plate structure that is made to be in a vacuum or reduced pressure.

[0012] The intermediate member is constituted by a porous plate provided with the voids made of a hard rubber material. Further, the hard rubber material constituting the porous plate of the intermediate member is mixed with carbon or ceramics to increase strength and hardness. Alternatively, the intermediate member is formed of a wire mesh having a coarse mesh so as to form the gap, and a hard rubber material is coated on a surface of a wire of the wire mesh.

In this sound insulating plate structure, a composite material comprising a pair of the metal plates and the intermediate member between the metal plates is press-formed and cut and formed into a predetermined shape. The seal member is disposed between the end portions of the metal plates to seal an intermediate portion between the metal plates, and the pressure in the gap of the intermediate member between the metal plates is reduced to substantially vacuum or reduced pressure. I have.

The sound insulating plate structure is applied to a sound insulating cover for covering the engine in order to cut off noise generated in the engine. Further, a sponge rubber is coated on the inside of the sound insulation cover.

Since the sound insulating plate structure is configured as described above, a laminated structure composed of a metal plate and an intermediate member of a hard rubber material can be easily press-formed. When producing a laminated structure of a metal plate and an intermediate member, an adhesive is applied to the metal plate and / or the intermediate member, and a porous hard rubber material is interposed between the metal plates and both are heated. Both are easily baked to produce a laminate having a hollow portion. Therefore, the laminate is press-formed, and unnecessary portions of the laminate are cut to form air vent holes in one place. The inside of the metal plate is evacuated or depressurized through the vent hole, and then the vent hole is closed. During the pressing process of the laminated plate, there may be a part where the metal plates are in contact with each other locally, but practically there is a hard rubber material between the metal plates and there is a gap in the hard rubber material Therefore, a sufficient sound insulation effect can be exhibited. That is, the vibration of the noise is absorbed by the hard rubber material, and the noise itself is cut off by the vacuum or reduced pressure layer between the metal plates.

According to the present invention, an engine body having a combustion chamber and an engine mounted on a base are provided by a sound insulating cover formed by the sound insulating plate structure according to any one of claims 1 to 7. A cover that covers a mount and a transmission connected to an output shaft of the engine via a clutch, wherein the sound insulation cover is attached to a transmission case of the transmission and the base, and is disposed outside the sound insulation cover and controls the engine. The present invention relates to a sound insulation structure for an engine comprising a radiator for cooling circulating cooling water.

Further, the sound insulation structure of the engine is provided with a water pump attached to the engine body and circulating cooling water for cooling the engine by the sound insulation cover, and attached to the engine body and supplying fuel to the engine. And a motor / generator mounted on the output shaft between the clutch and the engine. Further, the engine and the radiator, and the radiator and the water pump are connected to each other by a cooling water hose penetrating the sound insulation cover.

The sound insulation structure of the engine includes the sound insulation cover, the engine mount, the cooling water hose, an intake pipe for supplying intake air to the engine, an exhaust pipe for discharging exhaust gas from the engine, and the transmission case. An elastic body made of a sound insulating rubber is interposed at a boundary between the fuel pipe and a fuel pipe for supplying fuel to the engine.

In this sound insulating plate structure, as described above, the intermediate portion of the laminated metal plates is formed in a vacuum or reduced pressure.
Noise can be efficiently cut off, a porous intermediate member is sandwiched inside the vacuum or depressurized space between the metal plates to maintain the internal shape in a vacuum or depressurized state, and the intermediate member is made of a hard rubber elastic material. To prevent the transmission of vibration,
The laminated structure consisting of the metal plate and the intermediate member can be press-formed, so that it can be formed into a desired shape such as an engine cover, etc. In addition, the porosity of the intermediate member is constituted by open pores so that the voids communicate with each other. Therefore, the inside of the intermediate member can be easily evacuated or reduced in pressure.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sound insulating plate structure according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a laminated structure constituting a sound insulating plate structure according to the present invention, and FIG. 2 is an embodiment of a part of a sectional structure of the laminated structure constituting the sound insulating plate structure of FIG. FIG. 3 is a cross-sectional view showing another example of a part of the cross-sectional structure of the laminated structure constituting the sound insulating plate structure of FIG. 1, and FIG. 4 is a press-formed processing of the sound insulating plate structure of FIG. It is a perspective view showing one example.

The sound insulation plate structure according to the present invention mainly comprises
As shown in FIG. 1, at least a pair of metal plates 1 and 2 which are arranged opposite to each other at a distance from each other, and an intermediate member 3 which supports the metal plate 1 and the metal plate 2 at a predetermined interval. The laminated plates 10 and 20 are formed by press forming of the laminated plates 10 and 20.
Are sealed by the seal member 4. The metal plates 1 and 2 can be made of, for example, an iron plate, an aluminum plate, or the like. In addition, a hard rubber material can be used for the seal member 4. In FIG. 1, the seal member 4 is shown by imaginary lines, but actually, the laminated structure 10,
When the plate 20 is used as a sound-insulating cover, the seal member 4 is arranged at the edge between the metal plates 1 and 2 in FIG. 1 to seal the edge. As shown in the figure, when the sound insulation cover is press-formed as the engine cover 11, the seal member 4 is disposed at the edge as shown in FIG.

As shown in FIG. 2, in one embodiment of the sound insulating plate structure, a joining portion 9 where the hard rubber material 5 of the intermediate member 3 contacts the metal plates 1 and 2 is joined by baking, and The gap 8 of the intermediate member 3 disposed in the hollow portion formed between the metal plate 1 and the metal plate 2 is substantially in a vacuum or reduced pressure state. The intermediate member 3 is formed of a porous plate having a gap 8 made of a hard rubber material 5. Also,
The hard rubber material 5 constituting the porous plate of the intermediate member 3 includes:
Carbon or ceramics are mixed to increase strength and hardness.

In another embodiment of this sound insulating plate structure, as shown in FIG. 3, the intermediate member 13 is made of a wire mesh 6 having a coarse mesh so as to form a gap 8, and the surface of the wire material of the wire mesh 6 is hard. A coating layer 7 made of a rubber material is coated.

In this sound insulating plate structure, the laminated structure 10 or 20 can be formed into a predetermined shape by press working. In FIG. 4, the laminated structure 10 or 20 has a sound insulating function by press working. A sound insulating cover formed on the engine cover 11 is shown. Engine cover 1
1 can be connected to another engine cover similarly molded using the mounting hole 12 to form a sound insulation cover having a shape capable of covering the engine itself. At this time, the gap at the boundary between the engine cover 11 and the engine cover having another shape can be sealed with a rubber material and further burned.

This sound insulating plate structure is manufactured by the following steps. In this sound insulating plate structure, an intermediate member 3 is interposed between a pair of metal plates 1 and 2 and laminated, and the contact portions between the metal plates 1 and 2 and the intermediate member 3 are baked and joined to each other to form a composite material. The laminated structures 10 and 20 are manufactured. Next, the laminated structures 10 and 20 are press-formed by a press, cut into a predetermined shape by a cutter, and formed into a predetermined shape. Therefore, the sealing member 4 is disposed in the gap between the ends of the metal plates 1 and 2, and the intermediate member 3 located between the metal plates 1 and 2 is hermetically sealed. Then,
The inside of the gap 8 of the intermediate member 3 between the metal plates 1 and 2 is decompressed to a substantially vacuum or decompressed state, so that a sound insulating cover having a desired shape can be formed.

The sound insulating plate structure is composed of the laminated structures 10 and 20.
Can be formed on the sound insulation cover 11 that covers the engine to block noise generated by the engine by molding. Also, inside the sound insulation cover 11,
The sponge rubber 14 may be coated to reduce the reflected sound inside the sound insulating cover 11.

Next, an embodiment of an engine sound insulation structure using the sound insulation plate structure according to the present invention will be described with reference to FIGS. FIG. 5 is a front view showing an embodiment of the engine structure provided with the sound insulating cover according to the present invention, and FIG. 6 is a side view of the engine structure provided with the sound insulating cover of FIG.

The sound insulation structure of the engine provided with the sound insulation plate structure according to the present invention can be applied to, for example, an engine 31 such as a diesel engine using a fuel such as light oil, heavy oil or gas fuel. Can be applied as an engine such as an installed cogeneration system, an engine for a vehicle, an engine for power generation, an engine for a hybrid vehicle, and the like. For example, the engine 31 has four strokes of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke. Are sequentially repeated.

The sound insulation structure of this engine is obtained by applying the sound insulation cover formed by the sound insulation plate structure described in each of the above embodiments. The engine 31 using the sound insulating cover has, for example, a cylinder liner that fixes a cylinder head to a cylinder block and forms a cylinder fitted in a hole formed in the cylinder block, and a piston that reciprocates in the cylinder. ing. In the engine 31, exhaust gas is exhausted through an exhaust manifold 49 and an exhaust pipe 32. The exhaust pipe 32 connected to the exhaust manifold includes, for example, a turbocharger or a power generation turbine (not shown) for recovering exhaust gas energy. ) Can be linked. The output shaft 33 of the engine 31 has
A motor / generator 34 for generating electric power for providing electric energy is connected. The motor / generator 34 has a function of driving as a generator to convert a braking force into electric energy, and a function of driving as a motor to function as a starter.

The sound insulation structure of the engine mainly includes an engine body 3 having a combustion chamber constituting an engine 31.
6, an engine mount 38 for attaching the engine body 36 to the base frame 37, and the output shaft 3 of the engine 31
3 covers a transmission 40 connected via a clutch 39. The sound insulation cover 35 is attached to the transmission case 41 of the transmission 40 and the frame 37 of the base. Radiator 30
Is arranged outside the sound insulation cover 35 and cools the cooling water circulating through the engine 31.

The sound insulation structure of the engine further includes a water pump 42 mounted on the engine body 36 and circulating cooling water for cooling the engine 31, and a fuel injection pump mounted on the engine body 36 and supplying fuel to the engine 31. An electric / generator 34 is provided on the output shaft 33 of the engine 31 via a crank gear 47. The sound insulation cover 35 is configured to cover the water pump 42, the electric / generator 34, and the fuel injection pump 43. The engine 31 and the radiator 30 and the radiator 30 and the water pump 42 are connected to the sound insulating cover 35.
Are communicated by cooling water hoses 44 and 45 penetrating through at predetermined positions.

In the engine structure having the sound insulation cover, the engine mount 38, the cooling water hoses 44, 4
5, an intake pipe 46 for supplying intake air to the engine 31, an intake pipe 46 for supplying intake air to a combustion chamber of the engine 31 through an intake manifold 50, an exhaust pipe 32 for discharging exhaust gas from the engine 31, and a transmission case 4.
A fuel pipe (not shown) for supplying fuel to the engine 1 and the engine 31 extends through the sound insulating cover 35.

In the sound insulation structure of this engine, the engine 3
1 and the radiator 30, and the radiator 30 and the cooling water pump 42 are connected to the cooling water hose 4
4,45. In the sound insulation structure of the engine, a sound insulation cover 35, an engine mount 38, cooling water hoses 44 and 45, an intake pipe 46 for supplying intake air to the engine 31, an exhaust pipe 32 for discharging exhaust gas from the engine 31, Transmission case 41
An elastic body 48 made of sound-insulating rubber is interposed at a boundary between the fuel pipe and the fuel pipe for supplying fuel to the engine 31.

In the sound insulation structure of this engine, an exhaust manifold 49 for discharging exhaust gas from the combustion chamber and an exhaust pipe 32 connected to the exhaust manifold 49 are formed in a heat insulation structure so as not to radiate heat into the sound insulation cover 35. Have been. The heat shielding structure of the exhaust manifold 49 and the exhaust pipe 32 is, for example,
The inner side can be made of an inner wall surface made of a heat-resistant ceramic or the like and a wall forming a port, and the wall can be covered with a heat insulating material such as a ceramic fiber. Therefore, the temperature inside the sound insulation cover 35 does not rise excessively, and the water pump 4
2. There is no adverse effect of heat on devices such as the fuel injection pump 43 and the electric / generator 34.

[0035]

The sound insulation structure of the engine according to the present invention
As described above, the noise generated from the engine is confined in the sound insulation cover, and the noise can be prevented from being radiated to the outside.
In particular, in the idling state, the output is not transmitted to the transmission, so the power generated by the motor / generator is consumed, and when the work equipment is driven, the noise generated by the engine and the motor / generator is reduced by the sound insulation cover. And can be driven extremely quietly. The sound insulation structure of this engine does not dissipate the heat of the exhaust gas into the sound insulation cover due to the heat insulation structure between the exhaust manifold and the exhaust pipe, so there is no adverse effect of the heat on the various equipment installed in the engine. . Moreover, if the sound insulation structure of the engine is used, the electric power can be supplied by the motor / generator connected to the output shaft without mounting another engine in the vehicle to generate electric power.

Further, since the radiator is configured as described above, the heat transfer area of the air passage through which the air flows can be greatly increased, and the efficiency of heat exchange with the cooling water can be increased. Compared with the finned radiator structure of the above, the radiator itself can be made compact as much as the heat transfer area can be made large. Also, since the radiator can feed cooling air by a fan, if the cooling water passage communicates with the engine cooling water outlet and the engine cooling water inlet with a hose or the like, the radiator can be installed at a desired location with respect to the engine. The degree of freedom in engine design is improved, and the noise can be confined by covering the engine and its accessories other than the radiator with the sound insulation cover as described above.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a laminated structure constituting a sound insulating plate structure according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of a part of a cross-sectional structure of a laminated structure constituting the sound insulating plate structure of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of a part of a cross-sectional structure of a laminated structure constituting the sound insulating plate structure of FIG. 1;

FIG. 4 is a perspective view showing one embodiment in which the sound insulating plate structure of FIG. 1 is press-formed.

FIG. 5 is a front view showing an embodiment of the sound insulation structure of the engine according to the present invention.

FIG. 6 is a side view of the sound insulation structure of the engine of FIG.

[Explanation of symbols]

 Reference numerals 1 and 2 Metal plate 3 and 13 Intermediate member 4 Seal member 5 Hard rubber material 6 Wire mesh 7 Coating layer 8 Void (open pore) 9 Baking joint 10 and 20 Laminated structure 11 Engine cover (sound insulation cover) 12 Mounting hole 14 Sponge Rubber 30 Radiator 31 Engine 32 Exhaust pipe 33 Output shaft 34 Electric / generator 35 Sound insulation cover 36 Engine body 37 Frame 38 Engine mount 39 Clutch 40 Transmission 41 Transmission case 42 Cooling water pump 43 Fuel injection pump 44, 45 Cooling water hose 46 Intake Pipe 47 Crank gear 48 Elastic body 49 Exhaust manifold

Claims (11)

[Claims] 1. A metal plate which is spaced apart and opposed to each other, and an intermediate member which supports the metal plates at a predetermined distance and is baked and joined to the metal plate on both sides via a hard rubber material. The laminated structure can be formed into a predetermined shape by press working, a gap between the edges of the metal plate is sealed with a seal member, and further formed on the intermediate member. A sound insulating plate structure in which gaps communicating with each other are substantially evacuated or reduced in pressure. 2. The sound insulation plate structure according to claim 1, wherein said intermediate member is formed of a porous plate having said gap made of a hard rubber material. 3. The sound insulating plate structure according to claim 2, wherein said hard rubber material forming said porous plate of said intermediate member is mixed with carbon or ceramics to increase strength and hardness. . 4. The sound insulation according to claim 1, wherein the intermediate member is formed of a wire mesh having a coarse mesh so as to form the gap, and a surface of a wire of the wire mesh is coated with a hard rubber material. Board structure. 5. A composite material comprising a pair of said metal plates and said intermediate member between said metal plates is press-formed, cut and processed into a predetermined shape, and formed into a predetermined shape. The seal member is arranged between the portions, the intermediate portion between the metal plates is sealed, and the inside of the space of the intermediate member between the metal plates is reduced in pressure to substantially reduce or reduce the pressure. The sound insulating plate structure according to claim 1. 6. The sound insulating plate structure according to claim 1, wherein the sound insulating plate structure is applied to a sound insulating cover that covers the engine to cut off noise generated by the engine. 7. The sound insulating plate structure according to claim 6, wherein a sponge rubber is coated on an inside of the sound insulating cover. 8. An engine body having a combustion chamber, an engine mount for attaching the engine body to a base, and an engine mount provided by the sound insulation cover formed by the sound insulation plate structure according to claim 1. A cover that covers a transmission connected to an output shaft of the engine via a clutch, the sound insulation cover is attached to a transmission case of the transmission and the base, and is disposed outside the sound insulation cover and circulates through the engine. The engine's sound insulation structure consists of a radiator that cools the engine. 9. A water pump mounted on the engine body and circulating cooling water for cooling the engine by the sound insulation cover, a fuel injection pump mounted on the engine body and supplying fuel to the engine,
9. The engine sound insulation structure according to claim 8, further comprising a motor / generator mounted on the output shaft between the clutch and the engine. 10. The engine sound insulation structure according to claim 9, wherein the engine, the radiator, and the radiator and the water pump are connected by a cooling water hose penetrating the sound insulation cover. 11. The sound insulation cover, the engine mount, the cooling water hose, an intake pipe for supplying intake air to the engine, an exhaust pipe for discharging exhaust gas from the engine, and a fuel for the transmission case and the engine. 11. The sound insulation structure for an engine according to claim 10, wherein an elastic body made of a sound insulation rubber is interposed at a boundary with the fuel pipe supplying the fuel.