JP2528498Y2 - Intake pipe structure of vehicle engine - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) This invention relates to a technique for improving the sound absorbing effect of an intake pipe structure of a vehicle engine, particularly an intake system noise.

(Prior art) In recent automobiles, reduction of engine noise in order to improve the quality of view, especially reduction of intake noise and airflow noise (hear noise, shear noise) of the turbocharger in vehicles equipped with a turbocharger, is an issue. Has become.

For this reason, generally, as shown in FIG. 6, a sound absorbing material 3 is provided on the back surface of the engine hood 1, a resonator is interposed in the intake system, or an air cleaner or an engine room is separated from the vehicle interior. By providing a sound absorbing material on a dash panel or the like, the above-described problem is addressed.

On the other hand, since one part of the intake system (intake pipe), which is a noise source, is fixed to the vehicle body, the engine is connected between the intake pipe fixed to the vehicle body and the intake pipe connected to the engine. In order to absorb vibration and prevent breakage of the intake pipe, it is necessary to connect with an elastic pipe such as a rubber hose. (As a structure for connecting the intake pipes, there is Japanese Utility Model Publication No. 61-25571.) (Problems to be Solved by the Invention) However, elastic pipes such as rubber hoses easily transmit sound, and As described above, even if sound insulation is provided by providing a sound absorbing material in the engine hood, there is a problem that a sufficient intake noise reduction effect cannot be obtained. In particular, in a turbocharged vehicle, when the throttle valve is in the open state, a large amount of air is supplied and the compressor impeller is rotating at high speed, and the throttle valve is suddenly fully closed,
Compressed air held between the compressor impeller, which continues to rotate due to inertia, and the throttle valve collides with the compressor impeller, generating abnormal noise, which is a major factor in intake noise.
Sound insulation was achieved by increasing the amount of the sound absorbing material 3.

Therefore, the present invention aims to provide an intake pipe structure for a vehicle engine that can obtain a sufficient sound insulation effect against intake noise even when an elastic pipe such as a rubber hose is used for absorbing vibration. I do.

[Structure of the invention] (Means for solving the problem) In order to solve the above-described problem, the present invention is based on the idea that each end of two metal pipes that are partially connected to the engine body side and the vehicle body side, respectively, The metal pipes are inserted into both ends of an elastic pipe located between the turbocharger and the intake throttle valve to connect the metal pipes through the elastic pipe, and the periphery of the elastic pipe is closely attached to the outer peripheral portion of the elastic pipe. Covered with resin sound insulation covers each having a contact portion at both ends and a large-diameter portion formed between the contact portions and forming a predetermined gap between the elastic tube and a sound absorbing material in the gap. The sound insulation cover is formed by joining a pair of semi-cylindrical members open at both ends, and with one side edge fixed, the flanges formed on the other side edge are fixed with a fixture. It is configured to be fixed, and the total length is It is shorter than sex tube is mounted in a state where both ends periphery is exposed elastic tube, and configured to fix fastening around the elastic tube so as to cover the exposed portions of both ends in the clamp member.

(Operation) According to such a configuration, by using an elastic tube such as a rubber hose, the engine vibration is absorbed to prevent the intake tube from being damaged, and the sound absorbing material around the elastic tube transmits the elastic tube. The noise component that is absorbed by the intake noise and that is not absorbed by the sound absorbing material is prevented from leaking to the outside by the sound insulating cover that covers the outside.

The sound insulation cover has a structure in which one side edge of a pair of semi-cylindrical members having both ends opened is fixed to each other, and the flanges formed on the other side edge are fixed to each other with a fixing tool. In addition, the sound absorbing cover can be easily attached to the intake system, and the sound insulating cover is made of resin, so that the vibration absorbing effect is not impaired despite the configuration of covering the elastic tube.

Furthermore, since the elastic tube has an exposed portion outside the contact portion at both ends of the sound insulating cover fixed with a clamp material, and the outer peripheral portion is covered with the sound insulating cover and the clamp material over the entire length, so that particularly the turbocharger and the intake For an elastic pipe that is located between the throttle valve and generates large intake noise inside,
The noise reduction effect is large.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a cross-sectional shape of a flexible tube 7 connected to the metal tube 5 in the intake system. The flexible tube 7 is composed of a rubber hose 9 as an elastic tube, a sound absorbing material 11, and a sound insulating cover 13, and the metal tube 5 is fitted into both ends of the rubber hose 9. Both ends of the rubber hose 9 are fixed to the metal tube 5 by clamps 15. The metal tubes 5 at both ends of the rubber hose 9
Either one is fixed to the vehicle body side and the other is fixed to the engine body side.
The connection allows the engine vibration to be absorbed. The rubber hose 9 has a three-layer structure in which both sides are sandwiched between heat-resistant rubbers 9b and 9c around a fiber layer 9a.

The outer peripheral side of the rubber hose 9 is a 1.5 mm thick vinyl chloride (P
It is covered with a sound insulation cover 13 made of VC). Sound insulation cover 13
2 to 4 is a two-piece structure composed of a pair of upper and lower halves 19 and 21 as a pair of semi-cylindrical members, and has a shorter overall length than the rubber hose 9 by the width of the clamp 15. An annular gap 23 is formed between the rubber hose 9 and the central portion 13a at both ends thereof.
Is formed as a large-diameter portion 13b having a large diameter.
The sound absorbing material 11 is filled in the gap 23 and is interposed.

The rubber hose 9 has an exposed portion, which is outside of the contact portions 13a at both ends of the sound insulating cover 13 and is not covered by the sound insulating cover 13, is fixed by a clamp 15 as a clamp material. And will be covered with.

Mutual connection 2 between the two halves 19 and 21 of the sound insulation cover 13
7, 29 have flanges 19a, 21a and 19
b and 21b are formed respectively. The flanges 19a and 21a as side edges of one of the joints 27 are fixed by welding or sewing with a sewing machine, and the flanges 19b and 21b formed on the side edges of the other joint 29 are used as fixing tools. 3
Fix with three clamps 31. Thereby, the sound absorbing material 11 is fixed to the rubber hose 9. FIG. 5 shows an application site of the joint structure of the intake pipe as described above. This is a top view of the engine room of the automobile, and the left direction in the figure is the front side of the vehicle. An intake branch pipe 33 is connected to the upper side of the engine body 32 in the figure, and each intake branch pipe 33 is connected to an intake collector 35.
Is gathered. At the front end of the vehicle of the intake collector 35,
Flexible pipes 39 and 41 having the above-mentioned sound insulation structure via a throttle valve 37
Is connected.

On the other hand, an exhaust manifold 45 is connected to a lower side of the engine body 32 in the drawing. A turbocharger 47 is provided near the exhaust manifold 45. The intake air supercharged by the turbocharger 47 is cooled by the intercooler 49.

The intake system 43 on the upstream side of the turbocharger 47 is mainly constituted by an outside air introduction duct 51, an air cleaner 53, a resonator 55 arranged beside the air cleaner 53, and an intake supply duct 57 to the terhocharger 47. At a substantially central portion of the intake supply duct 57, a flexible tube 57a made of rubber is interposed. Outside air introduction duct 51, air cleaner 53, resonator 55
Are made of resin and are fixed to the vehicle body.

On the other hand, the intake system 43 on the downstream side of the turbocharger 47 includes metal pipes 59 and 61 sequentially connected from the turbocharger 47 side, a flexible pipe 41 having the above-mentioned sound insulation structure, a metal pipe 65, and an intercooler.
49, metal pipes 67, 69, 71, and flexible pipes having the above-mentioned sound insulation structure
It is mainly composed of 39. Metal tube 59,61,65,67,69,71
Is made of, for example, an iron-based metal or an aluminum alloy. The intercooler 49 and the metal tubes 65, 67, 69, 71 are all fixed to the vehicle body.

A dash panel 73 that separates the engine room from a vehicle room (not shown) is provided with a sound insulating material 75 to prevent engine noise from leaking into the vehicle room.

 Next, the operation will be described.

The engine vibration is absorbed by a rubber flexible tube 57a in the intake air supply duct 57 on the upstream side of the turret charger 47, and on the downstream side of the turbocharger 47 by a flexible structure having a sound insulation structure against intake noise. Absorbed by tubes 39,41. The flexible pipes 39 and 41 can fill the gap 23 between the rubber hose 9 and the sound insulation cover 13 with the sound absorbing material 11 gently while containing air, which is combined with the fact that the sound insulation cover 13 is made of resin. As a result, sufficient vibration absorption can be obtained. The filling operation of the sound absorbing material 11 is performed by attaching the sound insulating cover 13 to the rubber hose 9 in a state where one of the connecting portions 27 is fixed by welding or the like.
Can be easily carried out in this state, and after the sound absorbing material 11 is filled, the other connecting portion 29 is clamped by the clamp 31.
Therefore, the work of attaching the sound insulation cover 13 to the intake system is also easy.

On the other hand, regarding the intake noise generated in the intake system, on the upstream side of the turbocharger 47, the noise caused by the intake pulsation is absorbed by the resonator 55. Also, regarding the downstream side of the turbocharger 47, especially when the compressor impeller of the turbocharger 47 is rotating at high speed, the throttle valve
When the 37 is suddenly closed from the open state, compressed air collides with the compressor impeller that continues to rotate due to inertia, generating a large noise. This noise is generated by metal pipes 59, 61, 65, 67, 69, 71
The rubber hose 9 shown in FIG. 1 is inferior in sound insulation characteristics and thus easily leaks to the outside because it has poor sound insulation characteristics because of its good sound insulation characteristics. However, the first
As shown in the figure, the rubber hose 9 having poor sound insulation properties is made of a sound absorbing material 11.
Since the air intake noise is covered by the sound insulating cover 13, the intake noise is first absorbed by the sound absorbing material 11, and the noise component that is not absorbed here is blocked by the sound insulating cover 13 to prevent leakage to the outside. The sound absorbing material 11 includes a rubber hose 9 and a sound insulating cover 13.
The gap 23 between the two is filled with the inner and outer sides in contact with each other, so that the noise absorbing effect is high. In the rubber hose 9, exposed portions at both ends which are not covered by the sound insulating cover 13 and which are outside the contact portions 13a at both ends of the sound insulating cover 13 are fixed by clamps 15, and the outer peripheral portion is clamped to the sound insulating cover 13 over the entire length.
Since the rubber hose 9 is located between the turbocharger 47 and the throttle valve 37 and generates a large amount of intake noise inside, the noise reduction effect is large. Since the abnormal noise when the throttle valve 37 is suddenly closed does not easily reach the upstream of the turbocharger 47, the upstream of the throttle valve 37 is made of a resin such as the outside air introduction duct 51, or a rubber flexible tube 57a. There is no problem with using a normal rubber hose as in the above.

As described above, the rubber hose 9 is covered with the sound absorbing material 11 and the sound insulating cover 13 despite the fact that the intake system uses a flexible tube that absorbs engine vibration to prevent damage to the intake system. A sufficient effect of reducing intake noise can be obtained without increasing the amount of the sound absorbing material 3 shown in FIG.

The rubber hose 9 has a three-layer structure in which both sides are sandwiched between heat-resistant rubbers 9b and 9c around the fiber layer 9a, so that the strength is high.
Moreover, it can be expanded by the supercharged pressurized air, thereby preventing breakage.

[Effects of the Invention] As described above, according to the present invention, the gap between the elastic pipe capable of absorbing engine vibration and the sound insulation cover is filled with a sound absorbing material, so that the noise of the intake system is significantly reduced. Can be done. In addition, the sound insulation cover has a structure in which the flanges formed on the other side edge are fixed to each other with a fixing member while one side edge of the pair of semi-cylindrical members having both ends opened is fixed, so that the sound absorbing material is used. And the sound insulation cover can be easily attached to the intake system, and since the sound insulation cover is made of resin, the vibration absorbing effect can be ensured irrespective of the configuration covering the elastic pipe. Furthermore, in the elastic tube, the exposed portion outside the contact portion at both ends of the sound insulation cover,
An elastic pipe that is fixed by a clamp material and whose outer peripheral portion is covered with a sound insulation cover and a clamp material over the entire length, and is particularly located between the turbocharger and the intake throttle valve and generates large intake noise inside. Has a large noise reduction effect.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an intake pipe structure according to an embodiment of the present invention, FIG. 2 is a plan view of the intake pipe, and FIG. 3 is III in FIG.
FIG. 4 is a view taken in the direction of the arrow IV in FIG. 2, FIG. 5 is a top view of an engine room of an automobile including an intake system to which the intake pipe is applied, and FIG. It is a side view of the front part of the automobile shown. 5, 61, 65, 71: Metallic sound, 9: Rubber hose (elastic tube) 11: Sound absorbing material, 13: Sound insulation cover 13a: Adhesive part, 13b: Large diameter part 15: Clamp (clamp material) ), 19, 21 ... half body (semi-cylindrical member) 19a, 21a ... flange (one side edge) 19b, 21b ... flange (the other side edge) 23 ... gap, 31 ... clamp (fixing tool) 32: Engine body, 37: Throttle valve 47: Turbocharger

Claims (1)

(57) [Scope of request for utility model registration] An end of each of two metal pipes partially connected to an engine body and a vehicle body is inserted into both ends of an elastic pipe located between a turbocharger and an intake throttle valve. The metal tubes are connected to each other via an elastic tube, and the periphery of the elastic tube is interposed between the contact portions at both ends which are in close contact with the outer peripheral portion of the elastic tube and the elastic tube formed between the contact portions. A large-diameter portion forming a predetermined gap is covered with a resin-made sound insulation cover each having a large-diameter portion, and the gap is filled with a sound-absorbing material. The sound insulation cover connects a pair of semi-cylindrical members open at both ends. In a state where one side edge is fixed to each other, the flanges formed on the other side edge are fixed to each other with a fixing tool, and the entire length is formed shorter than the elastic tube, and both ends of the elastic tube are formed. It is installed with the outer periphery exposed. Intake pipe structure of the vehicle engine, characterized in that the periphery of the elastic tube so as to cover the exposed portion to secure the fastening clamp member.