JPH1162744A - Intake silencer system for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake silencer system for a vehicle which can produce a silencing effect in a wide range of frequency with a simple compact structure and can be easily arranged in a narrow space of an engine room of a car. SOLUTION: A case 14 of an intake silencer system R comprises a first half case body 11 and a second half case body 12 which are joined to each other at the mating faces 13 and an intake duct 15 sandwiched by the mating faces 13 opens to the inside of a case 14 to damp noises by a resonance effect. The case side wall 118 of the first case half body 11 is formed slantwise along a fender 23 slanting to the center line P of a vehicle body and three ribs 119 to 1111 extending from the inside of the case side wall 118 to the center side of the vehicle body form four auxiliary silence chambers 19a to 19d functioning as side branches for producing the resonance effect to produce the silencing effect in different frequency bands, which produces the silencing effect in a wide range of frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake muffler for a vehicle having an intake air muffler having an intermediate portion of an air intake duct whose both ends communicate with the atmosphere and an engine, respectively.

[0002]

2. Description of the Related Art Such an air intake silencer is disclosed in, for example,
It is known from 158965. As shown in FIG. 9, the above conventional intake silencer has a first silencer chamber 02 and a second silencer chamber 03 defined inside a case 01, and a first intake duct 04 communicating with the engine and a second silencer communicating with the atmosphere. 2
The first and second noise reduction chambers 02 and 03 are made to face the intake duct 05 inside the first noise reduction chamber 02 and to communicate the second intake duct 05 with the second noise reduction chamber 03 via the communication pipe 06. The effect of silencing is exhibited by the resonance effect of

[0003]

In the above-described conventional apparatus, the first and second muffling chambers 02 and 03 each exhibit only a muffling effect in one frequency band. In this case, it is necessary to further increase the number of muffling chambers or add side branches, which causes a problem that the structure and size of the intake muffling device become complicated and increase the cost. In particular, if a large-sized intake silencer with a complicated structure is to be placed in a narrow engine room, a lot of space will be required, which will hinder the placement of other accessories and interfere with other components. Therefore, there is a problem that the workability of attaching and detaching is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has a simple and compact structure, which can exert a noise-reducing effect over a wide frequency range, and can be used in a narrow space such as an engine room of an automobile. It is an object of the present invention to provide an intake silencer in which arrangement of the air intake is easy.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, an intermediate portion of an intake duct whose both ends communicate with the atmosphere and the engine is opened inside the intake muffler. In a vehicle air intake silencer comprising: at least a part of the air intake silence chamber is constituted by an inclined surface along a vehicle body wall inclined with respect to a vehicle body center plane, and a plurality of ribs formed integrally with the inclined surface. A plurality of sub-muffling chambers having mutually different resonance frequencies are formed inside the suction muffling chamber by extending in parallel toward the intake duct.

[0006] According to the above configuration, by forming the inclined surface of the intake silencer along the vehicle body wall, it is possible to prevent dead space from being generated between the intake silencer and the vehicle body wall, and to effectively utilize the space. it can. Moreover, since the resonance frequency can be made different from each other by providing a difference in the size and shape of the plurality of sub-muffling chambers by the inclined surface, the resonance effect of each sub-muffling chamber functioning as a side branch covers a wide frequency range. It is possible to exhibit a noise reduction effect. Further, since the plurality of ribs increase the rigidity of the intake silencing chamber, the generation of radiated sound due to vibration can be effectively suppressed.

According to a second aspect of the present invention, in addition to the first aspect, the plurality of sub-muffling chambers and the intake duct are respectively provided on one side and the other side of the intake muffling chamber in the horizontal direction. In addition to the arrangement, the tips of the plurality of ribs are aligned in the vehicle longitudinal direction.

According to the above configuration, the intake duct is prevented from interfering with the ribs, so that the dimensions of the ribs are not restricted, and the degree of freedom in setting the dimensions and shape of the sub-muffling chamber is increased. Moreover, since a wall surface forming a rib can be secured in the intake silence chamber, the rigidity of the intake silence chamber is also improved.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the cross-sectional shape of the intake duct is an elliptical shape having a minor axis along a direction in which the rib extends. There is a feature.

According to the above configuration, interference between the intake duct and the ribs is more effectively prevented, so that the degree of freedom in setting the size and shape of the sub-muffling chamber is further increased.

According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the air intake silencing chamber is supported by a vehicle body frame, and the air intake duct is provided on a side of the air intake silencing chamber near the vehicle body frame. Are arranged.

According to the above structure, the position of the center of gravity of the intake silencer including the intake duct can be brought closer to the vehicle body frame, so that the support rigidity of the intake silencer can be increased.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on embodiments of the present invention shown in the accompanying drawings.

FIGS. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a side view of a vehicle body front portion of an automobile equipped with an intake silencer, and FIG. FIG. 3, FIG. 3 is a sectional view taken along line 3-3 of FIG. 1, FIG. 4 is an overall perspective view of the intake silencer, FIG. 5 is a view taken along line 5-5 of FIG. 4, and FIG. FIG. 7 is a cross-sectional view, and FIG.

As shown in FIGS. 1 to 3, a right side frame 22 constituting a vehicle body frame of the present invention is provided on a right front part of an engine room 21 provided at a front part of a vehicle body of an automobile.
Are arranged in the vehicle longitudinal direction. As is clear from FIG. 2, the fender 23 constituting the vehicle body wall of the present invention is disposed on the right side of the side frame 22, and the intake silencer R is provided between the left side surface of the fender 23 and the right side surface of the side frame 22. Be placed. The intake silencer R includes a first case half 11 on the right and a second case half 12 on the left.
And a synthetic resin case 14 integrally joined by a mating surface 13 extending in the vertical direction, and a mating surface 13 of a first case half 11 and a second case half 12 formed in a J shape.
And an intake duct 15 made of synthetic resin.

At the front end and the rear end of the second case half 12,
Each mounting bracket 12_Ten, 12 ₁₁Are integrally formed
And these mounting brackets 12_Ten, 12₁₁Is a bolt
At 24, 24, it is fastened to the side frame 22. Also the
Rubber cushion provided at the center on the left side of the two-case half 12
Down from the front of the side frame 22
Plate 22₁Contact the right side of the case
14 is restricted. It is clear from FIG.
As described above, the intake silencer R is configured to
The side frame is fastened to the
It is supported to protrude to the right from 22, but it is heavy
A certain intake duct 15 is located near the side frame 22
Because of the arrangement, the support rigidity of the intake silencer R is increased.
Can be Note that a battery is located on the front left side of the side frame 22.
The rim 26 is supported.

As is apparent from FIG.
The right side wall 1 of the first case half 11 is inclined so that the front side of the vehicle body approaches the vehicle body center plane P in plan view.
₁₈ is formed so as to be inclined along the inner surface of the fender 23. As a result, the case side wall 11 ₈ of the inner surface and the first case half 11 of the fender 23 is opposed via the α slight gap. By thus along the side wall of the case 11 ₈ fender 23, a narrow engine room 21
A dead space can be prevented from being generated inside the space, and the space can be effectively used.

A recess 11 is provided in the lower front part of the first case half 11.
₁₃ (see FIGS. 2 and 4) are formed, the turn signal lamp 27 provided at the right end of the front bumper (not shown) is accommodated in the recess 11 _13.

The pair of mounting brackets 28 ₁ provided on the front and rear portions of the air cleaner 28, 28 _2, the side frame 22
Are fixed to the upper ends of a pair of front and rear stays 29 and 30 erected on the upper surface thereof by bolts 31 and 31, respectively. As a result, the air cleaner 28 is located above the side frame 22, the rear of the right intake silencer R and the left battery 2
6 is supported at a position sandwiched between the rear portion and the rear portion. At this time, in order to avoid interference with the bonnet 32 inclined forward and downward,
The air cleaner 28 is arranged so as to be inclined so that its upper surface is parallel to the bonnet 32 (see FIG. 1).

[0020] In Thus projects, the air inlet 15 ₅ of the intake duct 15 protruding from the upper surface of the case 14, together with the intake air introduction duct 33 extending upwardly toward the lower surface of the bonnet 32 is connected, from the top surface of the case 14 air outlet 15 ₆ of the intake duct 15 is connected directly to the air inlet 28 ₃ protruding from the lower surface of the air cleaner 28. The upper part of the air cleaner 28, that is, the element 28
Wherein across the ₄ and air inlet 28 ₃ air outlet 28 ₅ provided on the opposite side, it is connected to an engine (not shown) through an air flow tube 34.

Next, the structure of the intake air silencer R will be described in detail with reference to FIGS.

The first case half 11 is connected to the second case half 12
With a volume larger than
A wedge-shaped recess 16 extending toward the mating surface 13 is formed at a position about one-half lower. Toward the mating surface 13 from the tip of the wedge-shaped recess 16 and the first partition wall 11 ₁ extends horizontally, the first partition wall 11 ₁ of the tip toward the mating surface 13 from the inner surface of the second case half 12 It is coupled to a second distal end of the partition wall 12 ₁ extending in the horizontal direction. As a result, the upper case upper walls 11 ₂ and 12 ₂ and the lower concave upper wall 16
_{Between the first} and the first and second partition walls 11 ₁ and 12 ₁ , a first resonance chamber 17 constituting the intake silencing chamber of the present invention is defined, and the lower case lower walls 11 ₃ and 12 ₃ are connected to the first resonance chamber 17. A second resonance chamber 18 is defined between the upper recessed lower wall 16 ₂ and the first and second partition walls 11 ₁ and 12 ₁ .

The case upper wall 11 of the first case half 11_TwoTo
A pair of notches 11 formed_Four, 11 _FiveAnd the second case half
Case upper wall 12 of body 12_TwoA pair of notches 12 formed in
_Four, 12_FiveAnd formed on the upper outer periphery of the intake duct 15
A pair of annular projections 15₁, 15 _TwoAre respectively pinched
(See FIGS. 4 and 5). Also, the first case half 11
1 partition 11₁Pair of notches 11 formed in₆, 11
₇And the second partition 12 of the second case half 12₁Formed into
A pair of notches 12₆, 12₇And under the intake duct 15
A pair of annular recesses 15 formed on the outer periphery_Three, 15_FourBut it
Respectively (see FIGS. 5 and 6). Thus, inhalation
Duct 15 includes first case half 11 and second case half
12 between the air inlet 15_Fiveand
Air outlet 15 ₆Is the case upper wall 11_Two, 12_TwoFrom above
Protrude into.

The J-shaped intake duct 15 is connected to the first resonance chamber 1.
7 are connected to each other at portions connecting wall 15 ₇ located inside of the connecting portion near the air outlet 15 ₆ Wall 1
By cutting up to 5 ₇ reaches the position, a slit-shaped opening 15 ₈ in communication with the inside of the inside of the first resonant chamber 17 of the intake duct 15 is formed. Also the intake duct 15
The communication pipe 15 is connected to a portion located inside the second resonance chamber 18.
It includes a _9, inside of the intake duct 15 through the communication pipe 15 ₉ communicates with the inside of the second resonant chamber 18.

Inside the first resonance chamber 17, a case upper wall 1 is provided.
1 _2, the recess upper wall 16 _1, contiguous to the casing sidewall 11 _8, and the mating surfaces 3 extending toward the 13 rib 1
1 ₉ , 11 ₁₀ , 11 ₁₁ are formed parallel to each other. Thus, inside the first resonance chamber 17, four sub-muffling chambers 19a to 19d that open toward the mating surface 13 are defined. 4
The dimensions and shapes of the sub-muffling chambers 19a to 19d are different so that each has a different resonance frequency. Moreover the wedge-shaped recess 16 of the first case half 11, a plurality of ribs 11 ₁₂ ... are provided so as to connect between the recess upper wall 16 ₁ and the recess lower wall 16 _2.

As is clear from FIGS. 4 and 5, the second
The case half 12 includes a first resonance chamber 17 and a second resonance chamber 1.
8 two drain holes 1 for draining the water inside
2 ₈ and 12 ₉ are provided. Drain hole 12 of first resonance chamber 17
_{Since 8} is provided on the front of the first resonant chamber 17, the suction of water from the opening 15 ₈ the distance between the drainage holes 12 ₈ and the opening 15 ₈ in the intake duct 15 and sufficiently secured Can be prevented. Similarly, the drain hole 12 ₉ in the second resonant chamber 18 because it is provided in the rear portion of the second resonant chamber 18, sufficiently the distance between the communication pipe 15 ₉ of the drain hole 12 ₉ and the intake duct 15 it is possible to prevent the suction of water from the communicating pipe 15 ₉ secured. The in-vehicle state, since the four subsidiary silencing chambers 19a~19d are open in the lateral direction (horizontal direction), the drain hole 12 ₈ of the first resonant chamber 17 has only one.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

The outside air sucked by the intake negative pressure generated by the operation of the engine is supplied to the air cleaner 28 and the intake silencer R.
And through a throttle body (not shown) to be supplied to the engine. At this time, the intake duct 1 of the intake silencer R
Internal 5 communicates with the inside of the first resonant chamber 17 through the opening 15 ₈ and for communicating with the inside of the second resonant chamber 18 through the communicating pipe 15 _9, functions as a resonance-type silencer The first and second resonance chambers 17 and 18 can attenuate noise in two different frequency bands. As is apparent from FIG. 7, the second resonance chamber 18 having a large volume attenuates noise in a relatively low frequency band, and the first resonance chamber 17 having a smaller volume than the second resonance chamber 18 has a higher volume. Attenuates frequency band noise.

At the same time, 3
The four sub-muffling chambers 19a to 19d defined by the ribs 11 _{9 to} 11 ₁₁ function as side branches having a resonance effect, respectively, and can attenuate noise in a frequency band according to the size and shape thereof. it can. As apparent from FIG. 2, the fender 2 which case sidewall 11 ₈ of the first case half 11 is inclined with respect to the vehicle body center plane P (see FIG. 2)
3 is formed along the case side wall 1.
Three ribs 11 ₉ extending from ₁₈ to the vehicle center plane P
If Soroere to 11 ₁₁ tip of the longitudinal direction of the vehicle body, each rib 11
₉ to ₁₁ The length of 11 automatically decreases automatically. As a result, the four sub-muffling chambers 19a to 19d become 19a → 19b → 19c.
→ The volume decreases in the order of 19d, and as shown by the solid line in FIG. 7, the noise from the low frequency band to the high frequency band can be attenuated in the order. FIG.
The dashed line indicates the noise reduction effect when the first resonance chamber 17 does not have the ribs 11 _{9 to} 11 ₁₁ (that is, the auxiliary noise reduction chambers 19a to 19d).
19d can be confirmed the noise attenuation effect (see the hatched portion).

As described above, the inside of the first resonance chamber 17
Rib 11₉~ 11₁₁With a simple structure just to form
Without increasing the size of the intake silencer R
Can effectively attenuate noise in a wide frequency band.
You. Moreover, the rib 11₉~ 11 ₁₁Are three of the first resonance chamber 17
Wall, that is, the case upper wall 11_TwoAnd the concave upper wall 16 ₁
And the case side wall 11₈Are connected together, so the first
The rigidity of the half body 11 can be greatly improved.
Note each wall 11_Two, 11₈, 16₁Of the sound radiated by the vibration of
Generation can be prevented.

In particular, the ribs 11 _{9 to} 11 ₁₁ correspond to the first resonance chamber 1.
The largest two opposing wall surfaces 7 mutually (that is, upper case upper wall 11 ₂ and the lower recess on the wall 16 ₁ of) Since the coupling together, easy case upper walls cause vibration due to the large area and radiated sound from 11 _2, it is possible to effectively suppress the radiated sound from the recess upper wall 16 _1. Furthermore the distance between the case upper wall 11 ₂ and the recess upper wall 16 ₁ for relatively small, it is possible to reduce the height of the ribs 11 ₉ to 11 _11. This not only increases the rigidity of the ribs 11 _{9 to} 11 ₁₁ themselves, but also makes it possible to reduce the thickness of the ribs 11 _{9 to} 11 ₁₁ to minimize an increase in weight. Moreover, since the ribs 11 _{9 to} 11 ₁₁ are arranged at substantially equal intervals, it is advantageous for improving the rigidity of the first case half 11.

The first case half 11 and the second case half 12 are manufactured by injection molding of a synthetic resin. The first case half 11 and the second case half 12 are formed on a mating surface 13 corresponding to a split surface of a mold for molding the first case half 11. On the other hand, the ribs 11 _{9 to} 11 ₁₁ and 11 ₁₂
Are formed in a direction orthogonal to the first direction.
Not only can the mold release of the case half 11 be facilitated and the structure of the mold can be simplified, but also the four sub-muffling chambers 19a can be formed without performing special processing on the molded first case half 11.
To 19d.

The intake duct 15 is connected to the first case half 11.
Further, since the second case half 12 is sandwiched and fixed to the mating surface 13, a special member such as a bolt is not required for the fixing. Moreover, as is clear from FIG.
Mating surface 13 for clamping the intake duct 15, since the offset farther from the rib 11 _{9-11 11} relative to the center of the intake silencer R, ribs 11 ₉ to 11 ₁₁ and the intake duct 15
Sub-muffling room 1 with sufficient capacity without considering interference with
9a to 19d can be configured.

Next, a second embodiment of the present invention will be described with reference to FIG.

As is apparent from a comparison between FIG. 6 and FIG. 8, the cross section of the intake duct 15 of the first embodiment (see FIG. 6) is a circular cross section on the upstream side and the rib 1 on the downstream side.
While 1 _{9-11 11} is formed in an elliptical shape having a major axis in a direction parallel to the cross section of the intake duct 15 of the second embodiment (see FIG. 8) is also the upstream and downstream either The ribs 11 _{9 to} 11 ₁₁ are formed in an elliptical shape having a minor axis in a direction parallel to the ribs. As a result, the length of the ribs 11 _{9 to} 11 ₁₁ can be extended without interfering with the intake duct 15, and the degree of freedom in setting the size and shape of the sub-muffling chambers ₁₉ a to ₁₉ d can be further increased.

Although the embodiments of the present invention have been described in detail above, various design changes can be made in the present invention without departing from the gist thereof.

[0037] For example, in the embodiment three ribs 11 ₉ to 1
1 ₁₁ but constitute four subsidiary silencing chambers 19a~19d by, the number of ribs may be two or more. The inclined body wall is not limited to the fender 23 illustrated in the embodiment, but may be another body wall such as a hood.
The cross-sectional shape of the intake duct 15 need not be mathematically strictly elliptical, but may be any shape having a major axis and a minor axis.

[0038]

As described above, according to the first aspect of the present invention, a dead space is generated between the intake silencer and the vehicle body wall by making the inclined surface of the intake silencer along the vehicle body wall. Can be prevented and the space can be effectively used. Moreover, since the resonance frequency can be made different from each other by providing a difference in the size and shape of the plurality of sub-muffling chambers by the inclined surface, the resonance effect of each sub-muffling chamber functioning as a side branch covers a wide frequency range. It is possible to exhibit a noise reduction effect. Further, since the plurality of ribs increase the rigidity of the intake silencing chamber, the generation of radiated sound due to vibration can be effectively suppressed.

According to the second aspect of the present invention,
Since the intake duct is prevented from interfering with the rib, the size of the rib is not restricted, and the degree of freedom in setting the size and shape of the sub-muffling chamber is increased. Moreover, since a wall surface forming a rib can be secured in the intake silence chamber, the rigidity of the intake silence chamber is also improved.

According to the third aspect of the present invention,
Since the interference between the intake duct and the ribs is more effectively prevented, the degree of freedom in setting the size and shape of the sub silencer is further increased.

According to the invention described in claim 4,
Since the position of the center of gravity of the intake silencer including the intake duct can be made closer to the vehicle body frame, the support rigidity of the intake silencer can be increased.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle body front portion of an automobile equipped with an intake silencer.

FIG. 2 is a view in the direction of arrows in FIG. 1;

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is an overall perspective view of an intake silencer.

FIG. 5 is a view taken along line 5-5 in FIG. 4;

FIG. 6 is a sectional view taken along line 6-6 in FIG. 4;

FIG. 7 is a graph illustrating a silencing effect.

FIG. 8 is a view according to a second embodiment and corresponding to FIG. 6;

FIG. 9 is a longitudinal sectional view of a conventional intake silencer.

[Explanation of symbols]

11 ₈ Case side wall (inclined surface) 11 _{9 to} 11 ₁₁ Rib 15 Intake duct 16 ₁ Recess upper wall (wall surface) 17 First resonance chamber (intake noise reduction chamber) 19a to 19d Secondary noise reduction chamber 22 Side frame (body frame) 23 Fender (Body wall)

Claims (4)

[Claims] An intermediate portion of an intake duct (15) whose both ends communicate with the atmosphere and the engine, respectively, is connected to an intake muffler (1).
7) A vehicle intake muffler having an opening inside the vehicle, wherein at least a part of the intake muffling chamber (17) is inclined along a vehicle body wall surface (23) inclined with respect to the vehicle body center plane (P). 11 ₈₎ are constituted by, by extending parallel to toward the inclined surface (11 ₈₎ and a plurality of ribs formed integrally (11 _{9-11 11)} the intake duct (15), the intake An intake silencer for a vehicle, wherein a plurality of sub silencers (19a to 19d) having mutually different resonance frequencies are formed inside a silencer (17). 2. The plurality of sub-muffling chambers (19a to 19d).
And the intake duct (15), as well as arranged on one side and the other side in the horizontal direction of each of the intake silencing chamber (17), aligning the tips of the plurality of ribs (11 ₉ to 11 ₁₁₎ in the longitudinal direction of the vehicle body 2. The method according to claim 1, wherein
4. The vehicle intake silencer according to claim 1. 3. A cross-sectional shape of the intake duct (15) is an elliptical shape whose minor axis extends along a direction in which the ribs (11 _{9 to} 11 ₁₁ ) extend. Or a vehicle intake silencer according to 2. 4. An intake silencer (17) supported on a vehicle body frame (22), and said intake silencer (17).
The intake air silencer according to claim 2, wherein the intake duct (15) is arranged on a side near the vehicle body frame (22).