JP3882881B2 - Engine intake system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an engine intake device in which an inlet pipe connected to an air intake port of an air cleaner and a resonator are integrally formed.
[0002]
[Prior art]
By arranging the air cleaner close to the throttle body attached to the surge tank, the torque characteristic is made to be a medium / low speed specification, and the acceleration performance of the engine is improved. For this reason, as shown in FIG. 7, the air cleaner 1 may be installed on the upper part of the engine 2.
[0003]
An inlet pipe 3 for air sucked into the engine 2 is connected to the intake port of the air cleaner 1, and an opening 3 a at the tip of the inlet pipe 3 is an intake duct 6 attached to the upper member 5 of the vehicle body 4. It is connected to the. Further, since the air cleaner 1 is attached to the cylinder head cover 8 of the engine 2 by the bracket 7, the vibration of the engine 2 is not transmitted to the vehicle body 4 via the air cleaner 1 and the inlet pipe 3 when the engine 2 is operated. The pipe 3 is provided with a vibration absorbing portion 9 formed of a bellows that absorbs vibration. Since the vibration absorber 9 corresponds to the three-dimensional vibration of the engine 2, approximately 1 to 3 vibration absorbers 9 are installed in the inlet pipe 3. FIG. 7 shows a structure in which two vibration absorbing portions 9 are provided.
[0004]
Resonators 10 and 11 are attached to the inlet pipe 3 as a soundproofing measure for air sucked into the engine 2 from the intake duct 6. In general, a low frequency around 100 Hz and a high frequency around 300 Hz are a problem as a countermeasure against intake noise. The resonator 10 is for reducing high frequency noise, and the resonator 11 is for reducing low frequency noise. The high frequency resonator 10 has a small capacity of about 300 cc and is attached to the substantially middle portion of the inlet pipe 3. However, since the low frequency resonator 11 requires a capacity of 2000 cc or more in function, generally, the vehicle body 4 Is attached and held.
[0005]
When the low frequency resonator 11 is attached to the vehicle body 4, the battery 12 is shifted to the rear of the vehicle body 4 to secure a space, and the resonator 11 is arranged in this portion and fixed by a bracket (not shown).
7, reference numeral 13 is a radiator, reference numeral 14 denotes radiator over Tafan, reference numeral 15 denotes the transmission, respectively. Further, a symbol F indicates a front portion of the vehicle, and a symbol R indicates a rear portion.
[0006]
As an air intake device, there is one disclosed in JP-A-8-193549. In this publication, an intake pipe having one end connected to an air cleaner mounted in an engine room is provided, and two resonators provided in a floating state with respect to the vehicle body are connected to the proximal end of the intake pipe. At the same time, the other end of the air intake duct provided in the floating state is connected to the other end of the air intake duct whose one end is opened to the atmosphere.
[0007]
[Problems to be solved by the invention]
In the conventional technology described above, when attaching a large volume low frequency resonator to the vehicle body, it is necessary to secure the space by shifting the battery to the rear of the vehicle body. May not be secured. In addition, in order to fix the low frequency resonator, a bracket is required, which increases the cost and complicates the installation work.
[0008]
In addition, although the low frequency resonator and the inlet pipe are connected by a pipe member, the frequency changes corresponding to the pipe diameter, length, etc. of the connecting portion, and in order to set the originally required frequency, That is, in order to reduce the noise frequency including the changing frequency, the volume of the resonator must be increased. However, since the layout of the resonator is limited, the capacity required for the resonator may not be ensured. .
[0009]
Also, when setting the resonator on transmission case can be secured relatively space, to prevent interference with the vehicle body fitting, resonator the cylinder head, it is necessary to mount the high temperature part such as a transmission case, Heat countermeasures when fixing the resonator are a problem.
[0010]
In addition, in the intake device disclosed in JP-A-8-193549, two resonators provided in a floating state with respect to the vehicle body are connected to an intake pipe connected to an air cleaner. However, if the resonator is provided in a floating state, This makes it difficult to mount a large volume resonator. Therefore, what is described in the above publication does not solve the problem of the present invention.
[0011]
The present invention has been made in view of this point, and by providing a large-volume low-frequency resonator by integral molding with an inlet pipe, it is easy to secure a mounting space for the resonator, and the resonator is mounted on the vehicle body. It is an object of the present invention to provide an engine air intake device that eliminates the need for a fixture and avoids the complexity of work, eliminates layout restrictions due to frequency changes, and eliminates heat countermeasures.
[0012]
[Means for Solving the Problems]
According to the present invention, as means for solving the above-mentioned problems, the invention described in claim 1 is such that one opening is connected to an intake duct fixed to the vehicle body, and the other opening is fixed to the engine. An intake system for an engine having an inlet pipe connected to an air cleaner, wherein the inlet pipe has a vibration absorbing portion in the vicinity of one opening , and the resonator is integrally formed with the inlet pipe on the downstream side of the vibration absorbing portion. the provided, the fixing portion is provided in the resonator, and is characterized in that attached to the water pipe is arranged the fixing unit on the transmission.
[0013]
In the first aspect of the invention, the resonator is integrally formed with the inlet pipe, thereby eliminating the layout restriction due to the change in frequency. Furthermore, the placing resonator in the middle of the inlet pipe, is attached to the water pipes disposed Resonators on transmission, placing the larger resonator volume on transmission.
[0014]
The inlet pipe has a predetermined length to connect the vehicle body and the air cleaner installed on the engine, but a large-capacity resonator formed integrally with the inlet pipe is provided in the middle of the inlet pipe. Even if the resonator is attached to the water pipe arranged on the transmission , even if the resonator vibrates in the same way as the engine, this vibration is absorbed by the vibration absorption part of the inlet pipe, and the resonator Interference with other parts can be prevented. Moreover, the inlet pipe and the resonator of the integral molding so attached to the water pipe in which the cooling water flows, it is possible to prevent the heat transfer to the resonator from the engine. This is particularly effective when the inlet pipe is vulnerable to heat, such as when the inlet pipe is made of resin.
[0015]
Further, The invention described in claim 2, in which according to claim 1, wherein the fixing unit is characterized in that attached to a cylinder head cover of the engine through the air cleaner.
[0016]
In the invention described in claim 2, since the resonator is attached to the cylinder head cover of the engine via the air cleaner, heat transfer from the engine can be prevented only by taking into consideration the heat countermeasure of the air cleaner.
[0017]
Further, The invention described in claim 3, in which according to claim 1 or 2, the bellows portion is provided in the inlet pipe, and arranged serpentine abdomen between the resonator and the other opening It is characterized by this.
[0018]
In the invention described in claim 3, since the bellows portion is provided in the inlet pipe, and the bellows portion is disposed between the resonator and the other opening portion, the cleaner of the air cleaner is maintained with the inlet pipe fixed to the engine. The element can be replaced by opening the cover.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4 schematically showing main portions. In addition, the same code | symbol is attached | subjected and demonstrated to the part same as FIG. In the figure, one opening 3 a is connected to the intake duct 6 fixed to the upper member 5 of the vehicle body 4 above the engine 2 and the transmission 15, and the other opening 3 b is connected to the cylinder head cover 8 of the engine 2 with a bracket 7.及bolts 16 (FIGS. 2 and 3 refer to) the inlet pipe 3 connected to the intake inlet of the fixed Kurinakaba over 1A of the air cleaner 1 through is arranged. In FIG. 3, reference numeral 16A denotes a bolt for attaching the air cleaner 1 to the cylinder head cover 8, and reference numeral 1B denotes a connection port of the air cleaner 1 to the throttle body.
[0020]
Inlet pipe 3 is the vehicle body 4 side, that has a vibration absorbing unit 9 in the vicinity of the opening portion 3a of the intake duct 6 side, and has a bellows portion 17 near the opening 3b of the air cleaner 1 side. Further, a resonator 18 integrally formed with the inlet pipe 3 is provided at a substantially intermediate portion of the inlet pipe 3 and downstream of the vibration absorbing portion 9. The resonator 18 is connected to a large capacity of 2000 cc to 3000 cc in order to cope with low frequency and high frequency noise.
[0021]
Here, an explanation will be given of the integral molding of the resonator 18 and the inlet pipe 3. As shown in FIGS. 5 and 6, the resonator 18 includes an upper resonator 18A and a lower resonator 18B, and the inlet pipe 3 is integrally formed on the upper side of the upper resonator 18A. More specifically, after the upper resonator 18A is molded, a mold for the inlet pipe 3 is placed at the mounting position of the upper inlet pipe 3, a synthetic resin liquid is poured into the mold, and the inlet pipe 3 is molded. The pipe 3 and the upper resonator 18A are formed integrally. Further, this integrated one is disposed on the upper part of the lower resonator 18B and the contact portion is welded to form the inlet pipe 3 integrated with the resonator 18.
[0022]
As described above, when the resonator 18 having a large volume is provided in the substantially middle portion of the inlet pipe 3, the resonator 18 may interfere with parts around the engine, so that the resonator 18 needs to be fixed to the engine 2. For this purpose, the resonator 18 is provided with brackets 19 and 20 which are fixed portions. However, since the resonator 18 is formed of a non-heat resistant member such as a synthetic resin and has a heat resistance of 120 ° C., the resonator 18 is directly connected to the cylinder head (cover) of the engine 2, an exhaust system component, or a transmission case. It cannot be attached directly to high temperature parts such as.
[0023]
Therefore, as shown in FIG. 3, one bracket 19 provided on the resonator 18 is attached to the bracket 22 </ b> A of the water pipe 22 with a bolt 21. Thereby, one side of the resonator 18 is fixedly supported by the water pipe 22. Since the water pipe 22 is a water channel returning from the radiator 13 to the engine 2, the water temperature does not reach 120 ° C. or higher. Further, the other side of the resonator 18 is overlaid on the bracket 7A of the air cleaner 1 and the bolt 23 is screwed together so that the other side of the resonator 18 is fixedly supported by the air cleaner 1.
[0024]
As described above, the air cleaner 1 is fixed to the cylinder head cover 8 with the bolts 16 and 16A. However, the air cleaner 1 is attached to the bolt mounting portion via a bush (not shown), and the air cleaner 1 has a high heat resistance. Since the heat-resistant resin material is used, the heat from the cylinder head cover 8 is not transmitted to the resonator 18 and the inlet pipe 3 through the air cleaner 1.
[0025]
Therefore, by fixing the resonator 18 integral with the inlet pipe 3 to the water pipe 22 and the air cleaner 1, it is possible to prevent conduction of heat from the cylinder head cover 8 of the engine 2 to the resonator 18. Further, as shown in FIG. 1, the inlet pipe 3 is disposed behind the radiator fan 14. As a result, it is possible to apply air from outside the vehicle to the inlet pipe 3 when the radiator fan 14 rotates, thereby bringing the air cooling effect to the inlet pipe 3.
[0026]
Since the present embodiment is configured as described above, the resonator 18 is integrally formed with the inlet pipe 3, so that there is no layout limitation due to a change in frequency, and a necessary capacity can be secured. Further, by placing the resonator 18 in the middle of the inlet pipe 3 and attaching the brackets 19 and 20 provided on the resonator 18 to the bracket 22A of the water pipe 22 and the bracket 7A of the air cleaner 1, the resonator 18 having a large capacity can be transmitted. The surplus space above the transmission 15 can be used effectively.
[0027]
In addition, since the inlet pipe 3 connects the vehicle body 4 and the air cleaner 1 disposed on the engine 2, the inlet pipe 3 has a predetermined length, and the inlet pipe 3 has a predetermined length in the middle of the inlet pipe 3 having the predetermined length. A large capacity resonator 18 integrally formed with the pipe 3 is disposed, and the resonator 18 is attached to the bracket 22A of the water pipe 22 or the bracket 7A of the air cleaner 1. Therefore, the resonator 18 vibrates in the same manner as the engine 2. However, the vibration of the resonator 18 can be absorbed by the vibration absorbing portion 9 of the inlet pipe 3 , and the resonator 18 can be prevented from interfering with parts around the engine. On the other hand, since the bellows portion 17 is provided in the inlet pipe 3, the element can be replaced by opening the cleaner cover 1A of the air cleaner 1 while the inlet pipe 3 is fixed to the engine 2.
[0028]
Since the bracket 19 of the resonator 18 integrally formed with the inlet pipe 3 is attached to the water pipe 22 through which cooling water flows, heat transfer from the engine 2 to the resonator 18 and the inlet pipe 3 can be prevented. This attachment is particularly effective when the inlet pipe 3 is vulnerable to heat, such as when the inlet pipe 3 is formed of a synthetic resin material.
[0029]
Since the bracket 20 of the resonator 18 is attached to the air cleaner 1 attached to the cylinder head cover 8 of the engine 2, the heat transfer from the cylinder head cover 8 of the engine 2 can be prevented only by considering the heat countermeasure of the air cleaner 1. Is possible.
[0030]
【The invention's effect】
Since the present invention is an engine intake device configured as described above, according to the first aspect of the present invention, the resonator is integrally formed with the inlet pipe, so that the layout is limited by a change in frequency. Can be avoided. In addition, since the resonator is arranged in the middle of the inlet pipe and the resonator is attached to the water pipe , a large-capacity resonator can be arranged on the transmission, and the surplus space on the transmission can be used effectively.
[0031]
A large-capacity resonator formed integrally with the inlet pipe is provided in the middle of the inlet pipe that connects the vehicle body and the air cleaner disposed on the engine, and this resonator is attached to a water pipe disposed on the transmission. Therefore, even if the resonator vibrates in the same way as the engine when the engine is operating, the vibration of the resonator can be absorbed by the vibration absorbing portion formed in the inlet pipe, and the resonator interferes with parts around the engine. Can be prevented.
[0032]
Furthermore, since the resonator integrally formed with the inlet pipe is attached to the water pipe through which the cooling water flows, heat transfer from the engine to the resonator and the inlet pipe can be prevented. This is particularly effective when the inlet pipe is vulnerable to heat, such as when the inlet pipe is made of resin.
[0033]
According to the invention described in claim 2 , since the resonator is attached to the cylinder head cover of the engine via the air cleaner, heat transfer from the cylinder head cover can be prevented only by measures against heat of the air cleaner.
[0034]
Furthermore, according to the invention described in claim 3, since the bellows portion is provided in the inlet pipe, and the bellows portion is disposed between the resonator and the other opening of the inlet pipe, the inlet pipe is fixed to the engine. You can open the cleaner cover of the air cleaner and replace the element.
[Brief description of the drawings]
FIG. 1 is a top view schematically showing a main part of an embodiment of the present invention.
2 is an enlarged top view showing a connection state between an inlet pipe integrated with the resonator shown in FIG. 1 and an air cleaner. FIG.
3 is an exploded perspective view of an inlet pipe integrated with the resonator shown in FIG. 1 and an air cleaner. FIG.
4 is an enlarged side view showing a mounting state of the resonator shown in FIG. 3; FIG.
5 is a cross-sectional view taken along line AA of the resonator shown in FIG. 2. FIG.
6 is a cross-sectional view taken along line BB of the resonator shown in FIG.
FIG. 7 is a top view showing the arrangement of conventional inlet pipes and resonators.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Engine 3 Inlet pipe 3a One opening 3b The other opening 4 Car body 6 Intake duct 8 Cylinder head cover 9 Vibration absorption part 15 Transmission 18 Resonator 19 Bracket 20 Bracket 22 Water pipe

Claims (3)

In an intake system for an engine having an inlet pipe with one opening connected to an intake duct fixed to the vehicle body and the other opening connected to an air cleaner fixed to the engine,
The inlet pipe has a vibration absorbing portion in the vicinity of one opening , and includes a resonator integrally formed with the inlet pipe on the downstream side of the vibration absorbing portion, the fixing portion is provided in the resonator, and the fixing portion is an intake system for an engine, characterized in that attached to the water pipe is disposed on the transmission. The fixing unit intake device for an engine according to claim 1, characterized in that attached to the cylinder head cover of the engine through the air cleaner. The engine intake device according to claim 1 or 2 , wherein a bellows portion is provided in the inlet pipe, and the bellows portion is disposed between the resonator and the other opening .

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