JP3974977B2 - Intake silencer for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intake silencer for a vehicle in which the inside of an intake duct whose both ends are connected to the atmosphere and an engine are connected to the inside of an intake silencer chamber.
[0002]
[Prior art]
Such an intake silencer is known, for example, from Japanese Patent Application Laid-Open No. 8-158965. As shown in FIG. 9, the conventional intake silencer described above has a first silencer chamber 02 and a second silencer chamber 03 defined in a case 01, and a first intake duct 04 communicating with the engine and the first silencer chamber 03 communicated with the atmosphere. The second intake duct 05 is opposed to the inside of the first silencing chamber 02, and the second intake duct 05 is communicated with the second silencing chamber 03 through the communication pipe 06, whereby the first and second silencing chambers 02, The muffler function is exhibited by the resonance effect of 03.
[0003]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional one, each of the first and second silencing chambers 02 and 03 exhibits only the silencing effect in one frequency band. Therefore, when trying to exert the silencing effect in a wide frequency range, the number of the silencing chambers is reduced. It is necessary to further increase or add a side branch, which causes a problem of increasing the cost because the structure and size of the intake silencer are complicated. In particular, if a large-sized intake silencer with a complicated structure is to be placed in a narrow engine room, a large amount of space is required, which hinders the placement of other auxiliary equipment or interferes with other members. As a result, there is a problem that workability of attachment / detachment is lowered.
[0004]
The present invention has been made in view of the above-described circumstances, and can exhibit a silencing effect over a wide frequency range while having a simple and compact structure, and can be arranged in a narrow space such as an engine room of an automobile. An object is to provide an easy intake silencer.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is directed to a vehicle intake silencer in which the inside of an intake duct whose both ends communicate with the atmosphere and the engine respectively communicate with the inside of the intake silencer chamber. At least a part of the intake silencer chamber is configured by an inclined surface along a vehicle body wall surface inclined with respect to the vehicle body center plane, the two wall surfaces facing each other of the intake silencer chamber, and the inclined surface connecting these two wall surfaces A plurality of sub-muffler chambers having mutually different resonance frequencies are formed inside the intake muffler chamber by extending a plurality of ribs respectively connected to each other from the inclined surface toward the intake duct. It is characterized by that.
[0006]
According to the above configuration, by causing the inclined surface of the intake silencer chamber to follow the vehicle body wall surface, it is possible to prevent the dead space from being generated between the intake silencer chamber and the vehicle body wall surface, and to effectively use the space. In addition, since the resonance frequency can be made different from each other by making the inclined surfaces have different sizes and shapes of the plurality of sub-noise reduction chambers, the resonance effect of each of the sub-noise reduction chambers functioning as side branches covers a wide frequency range. It is possible to exert a silencing effect. Further, since the plurality of ribs increase the rigidity of the intake silencer chamber, generation of radiated sound due to vibration can be effectively suppressed.
[0007]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the plurality of auxiliary silencing chambers and the intake duct are disposed on one side and the other side in the horizontal direction of the intake silencing chamber, respectively. The front ends of the plurality of ribs are aligned in the longitudinal direction of the vehicle body.
[0008]
According to the above configuration, since the intake duct is prevented from interfering with the rib, there is no restriction on the size of the rib, and the degree of freedom in setting the size and shape of the sub-noise reduction chamber is increased. In addition, since the wall surface forming the rib can be secured in the intake silencer chamber, the rigidity of the intake silencer chamber is also improved.
[0009]
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 the extending direction of the rib. Features.
[0010]
According to the above configuration, the interference between the intake duct and the rib is more effectively prevented, so that the degree of freedom in setting the size and shape of the auxiliary silencing chamber is further increased.
[0011]
According to a fourth aspect of the present invention, in addition to the configuration of the second aspect, the intake silencer chamber is supported by a vehicle body frame, and the intake duct is disposed on the side of the intake silencer chamber close to the vehicle body frame. It is characterized by that.
[0012]
According to the above configuration, the gravity center position 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]
Further, in the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the first case half and the second case half are integrally joined at a mating surface. A tip of a first partition extending from the inner surface of the first case half toward the mating surface, and a tip of a second partition extending from the inner surface of the second case half toward the mating surface. Are combined into a first resonance chamber as the intake silencer chamber and a second resonance chamber different from the intake silencer chamber, and the intake duct communicates with an opening communicating with the first resonance chamber and the first resonance chamber. And a communication pipe communicating with the second resonance chamber.
[0014]
According to the above configuration, since the intake duct communicates with the first resonance chamber via the opening and the intake duct communicates with the second resonance chamber via the communication pipe, the two different depending on the first and second resonance chambers. Noise in the frequency band can be attenuated.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0016]
1 to 7 show a first embodiment of the present invention. FIG. 1 is a side view of a front part of a vehicle body on which an intake silencer is mounted. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1, FIG. 4 is an overall perspective view of the intake silencer, FIG. 5 is a sectional view taken along line 5-5 in FIG. 4, and FIG. FIG. 7 is a graph for explaining the silencing effect.
[0017]
As shown in FIGS. 1 to 3, a right side frame 22 constituting the body frame of the present invention is disposed in the front-rear direction of the vehicle body on the right side of the front portion of the engine room 21 provided in the vehicle body front portion of the automobile. As is clear from FIG. 2, the fender 23 constituting the vehicle body wall surface 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 synthetic resin case 14 formed by integrally joining a first case half 11 on the right side and a second case half 12 on the left side with a mating surface 13 extending in the vertical direction, and a J-shape. A synthetic resin intake duct 15 formed and sandwiched between the mating surfaces 13 of the first case half 11 and the second case half 12 is formed.
[0018]
Mounting brackets 12 ₁₀ and 12 ₁₁ are integrally formed at the front end and the rear end of the second case half 12, respectively, and these mounting brackets 12 ₁₀ and 12 ₁₁ are fastened to the side frame 22 by bolts 24 and 24. Further, the rubber cushion 25 provided at the center of the left side surface of the second case half body 12 is brought into contact with the right side surface of the plate body 22 ₁ that hangs downward from the front portion of the side frame 22, so Fluctuations are regulated. As apparent from FIG. 2, the intake silencer R is supported so as to protrude rightward from the side frame 22 by fastening the second case half 12 to the side frame 22. Since the duct 15 is disposed at a position close to the side frame 22, the support rigidity of the intake silencer R is increased. A battery 26 is supported on the left side of the front portion of the side frame 22.
[0019]
As apparent from FIG. 2, the fender 23 is the front side of the vehicle body is inclined in a direction approaching the vehicle body center plane P in plan view, the right side of the case side wall 11 ₈ of the first case half 11 along the inner surface of the fender 23 It is formed so as to be inclined. 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 fenders 23, dead space in narrow engine room 21 is prevented from occurring can be effectively utilized for space.
[0020]
A recess 11 ₁₃ (see FIGS. 2 and 4) is formed in the front lower portion of the first case half 11, and a turn signal lamp 27 provided at the right end of a front bumper (not shown) is housed in the recess 11 _13. .
[0021]
A pair of mounting brackets 28 ₁ , 28 ₂ provided at the front and rear portions of the air cleaner 28 are fixed to the upper ends of a pair of front and rear stays 29, 30 erected on the upper surface of the side frame 22 with bolts 31, 31, respectively. As a result, the air cleaner 28 is supported at a position above the side frame 22 and sandwiched between the rear portion of the right intake silencer R and the rear portion of the left battery 26. At this time, in order to avoid interference with the bonnet 32 inclined forward and downward, the air cleaner 28 is arranged to be inclined so that the upper surface thereof is parallel to the bonnet 32 (see FIG. 1).
[0022]
Thus, the air inlet 15 ₅ of the air intake duct 15 protruding from the upper surface of the case 14 is connected to the air intake duct 33 extending upward toward the lower surface of the bonnet 32, and the air intake duct protruding from the upper surface of the case 14. air outlet 15 ₆ of 15 is connected directly to the air inlet 28 ₃ protruding from the lower surface of the air cleaner 28. The upper portion of the air cleaner 28, that is, the air outlet 28 ₅ is provided opposite the air inlet 28 ₃ across the element 28 ₄ is connected to an engine (not shown) through an air flow tube 34.
[0023]
Next, the structure of the intake silencer R will be described in detail with reference to FIGS.
[0024]
The first case half 11 has a larger volume than the second case half 12, and a wedge-shaped recess 16 extending toward the mating surface 13 is formed at a position lowering from the upper surface by about a third. The 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 , the lower recessed upper wall 16 _1, and the first and second partition walls 11 ₁ and 12 ₁ constitute the intake silencer chamber of the present invention. The first resonance chamber 17 is partitioned, and the second resonance is formed between the lower case lower walls 11 ₃ and 12 ₃ and the upper recessed lower wall 16 ₂ and the first and second partition walls 11 ₁ and 12 _1. A chamber 18 is defined.
[0025]
A pair of notches 11 ₄ , 11 ₅ formed in the case upper wall 11 ₂ of the first case half 11 and a pair of notches 12 ₄ , 12 ₅ formed in the case upper wall 12 ₂ of the second case half 12. In addition, a pair of annular convex portions 15 ₁ and 15 ₂ formed on the outer periphery of the upper portion of the intake duct 15 are respectively sandwiched (see FIGS. 4 and 5). The pair of notches 11 ₆ and 11 ₇ formed in the first partition wall 11 ₁ of the first case half 11 and the pair of notches 12 ₆ and 12 formed in the second partition wall 12 ₁ of the second case half 12. ₇ , a pair of annular recesses 15 ₃ and 15 ₄ formed on the outer periphery of the lower portion of the intake duct 15 are respectively sandwiched (see FIGS. 5 and 6). Thus, the intake duct 15 is firmly sandwiched between the first case half 11 and the second case half 12, and the air inlet 15 ₅ and the air outlet 15 ₆ are located upward from the case upper walls 11 ₂ and 12 _2. Protruding.
[0026]
In the J-shaped intake duct 15, portions located inside the first resonance chamber 17 are connected to each other by a connecting wall 15 ₇ , and a portion close to the air outlet 15 ₆ reaches a position reaching the connecting wall 15 _7. by cutting, 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. The intake duct 15 is provided with a communication pipe 15 ₉ at a portion located inside the second resonance chamber 18, and the inside of the intake duct 15 communicates with the inside of the second resonance chamber 18 via the communication pipe 15 _9. To do.
[0027]
Inside the first resonant chamber 17, the case upper wall 11 _2, the recess upper wall 16 _1, contiguous to the casing sidewall 11 _8, and the mating surfaces 13 of three ribs 11 extending toward the _9, 11 _10, 11 ₁₁ are formed parallel to each other. Thus, four sub-noise reduction chambers 19 a to 19 d that open toward the mating surface 13 are defined inside the first resonance chamber 17. The sizes and shapes of the four auxiliary sound deadening 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.
[0028]
As is apparent from FIGS. 4 and 5, the second case half 12 has two drain holes 12 ₈ , 12 for discharging the water in the first resonance chamber 17 and the second resonance chamber 18 to the outside. _{With nine} . Since the drain hole 12 ₈ of the first resonance chamber 17 is provided in the front part of the first resonance chamber 17, a sufficient distance between the drain hole 12 ₈ and the opening 15 ₈ of the intake duct 15 is secured. it is possible to prevent the suction of water from the opening 15 _8. Similarly, since the drain hole 12 ₉ of the second resonance chamber 18 is provided in the rear part of the second resonance chamber 18, the distance between the drain hole 12 ₉ and the communication pipe 15 ₉ of the intake duct 15 is sufficiently large. 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.
[0029]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0030]
The outside air sucked by the intake negative pressure generated by the operation of the engine passes through the air cleaner 28, the intake silencer R, and a throttle body (not shown) and is supplied to the engine. At this time, the inside of the intake duct 15 of the intake silencer R communicates with the interior of the first resonance chamber 17 through the opening 15 _{8, and} communicates with the interior of the second resonance chamber 18 through the communication pipe 15 _9. Therefore, noises in two different frequency bands can be attenuated by the first and second resonance chambers 17 and 18 functioning as a resonance silencer. As 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 is higher than that. Attenuates noise in the frequency band.
[0031]
At the same time, the four auxiliary sound deadening chambers 19a to 19d defined by the three ribs 11 ₉ to ₁₁ 11 inside the first resonance chamber 17 function as side branches having a resonance effect, respectively. Noise in a frequency band corresponding to the shape can be attenuated. As apparent from FIG. 2, the case side wall 11 _{8 of} the first case half 11 is formed along the fender 23 inclined with respect to the vehicle body center plane P (see FIG. 2). _If the tips of the three ribs 11 ₉ to ₁₁ 11 extending from ₈ toward the vehicle body center plane P are aligned in the longitudinal direction of the vehicle body, the lengths of the ribs 11 _{9 to} 11 ₁₁ are automatically gradually reduced. As a result, the volume of the four sub-noise reduction chambers 19a to 19d decreases in the order of 19a → 19b → 19c → 19d, and as shown by a solid line in FIG. The noise up to the belt can be attenuated. The broken line in FIG. 7 shows the silencing effect when the first resonance chamber 17 does not have the ribs 11 _{9 to} 11 ₁₁ (that is, the sub silencing chambers 19a to 19d). Compared with the solid line, the sub silencing chamber 19a to The noise attenuation effect by 19d (see the shaded area) can be confirmed.
[0032]
Thus, a simple structure in which the plurality of ribs 11 _{9 to} 11 ₁₁ are formed inside the first resonance chamber 17, and a wider frequency band than the conventional one without incurring an increase in the size of the intake silencer R. Noise can be effectively attenuated. Moreover the ribs 11 ₉ to 11 ₁₁ three walls of the first resonant chamber 17, i.e. the case upper wall 11 _2, the recess upper wall 16 _1, since the integrally connected to the casing sidewall 11 _8, first case half 11 can be greatly improved, and generation of radiated sound due to vibration of the wall surfaces 11 ₂ , 11 ₈ , and 16 ₁ can be prevented.
[0033]
In particular, the ribs 11 _{9 to} 11 ₁₁ integrally connect the two largest opposing wall surfaces of the first resonance chamber 17 (that is, the upper case upper wall 11 ₂ and the lower concave upper wall 16 ₁ ). , it is possible to effectively suppress the radiated sound, and a radiated sound from the recess upper wall 16 ₁ from easily case upper wall 11 ₂ caused the vibration due to the large area. 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. As a result, not only the rigidity of the ribs 11 _{9 to} 11 ₁₁ itself can be increased, but also the ribs 11 _{9 to} 11 ₁₁ can be thinned 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.
[0034]
Further, the first case half 11 and the second case half 12 are manufactured by injection molding of synthetic resin, but with respect to the mating surface 13 corresponding to the split surface of the mold for molding the first case half 11, Since the ribs 11 _{9 to} 11 ₁₁ , 11 ₁₂ ... Are formed in an orthogonal direction, it is only possible to easily release the molded first case half 11 and simplify the structure of the mold. In addition, the four sub-muffler chambers 19a to 19d can be configured without performing special processing on the molded first case half 11.
[0035]
Further, by holding the intake duct 15 between the mating surfaces 13 of the first case half 11 and the second case half 12 and fixing them, no special member such as a bolt is required for the fixing. Further, as it is apparent from FIG. 6, the 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, the ribs 11 ₉ to Without considering interference between 11 ₁₁ and the intake duct 15, it is possible to configure the auxiliary silencing chambers 19 a to ₁₉ d having a sufficient volume.
[0036]
Next, a second embodiment of the present invention will be described with reference to FIG.
[0037]
6 and 8, it is clear that the intake duct 15 of the first embodiment (see FIG. 6) has a circular cross section on the upstream side and a downstream side parallel to the ribs 11 _{9 to} 11 _11. The cross section of the air intake duct 15 of the second embodiment (see FIG. 8) has ribs 11 ₉ to ₁₁ 11 on both the upstream side and the downstream side. It is formed in an elliptical shape having a minor axis in a parallel direction. 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 dimensions and shapes of the auxiliary sound deadening chambers 19a to 19d can be further increased.
[0038]
As mentioned above, although the Example of this invention was explained in full detail, this invention can perform a various design change in the range which does not deviate from the summary.
[0039]
For example, in the embodiment, the four sub sound deadening chambers 19a to 19d are constituted by the three ribs 11 _{9 to} 11 ₁₁ , but the number of ribs may be two or more. Further, the inclined vehicle body wall surface is not limited to the fender 23 illustrated in the embodiment, and may be another vehicle wall surface such as a bonnet. Further, the cross-sectional shape of the intake duct 15 does not have to be a mathematically exact ellipse, and may be a shape having a major axis and a minor axis.
[0040]
【The invention's effect】
As described above, according to the first aspect of the present invention, by causing the inclined surface of the intake silencer chamber to follow the vehicle body wall surface, it is possible to prevent a dead space from being generated between the intake silencer chamber and the vehicle body wall surface. Can be used effectively. In addition, since the resonance frequency can be made different from each other by making the inclined surfaces have different sizes and shapes of the plurality of sub-noise reduction chambers, the resonance effect of each of the sub-noise reduction chambers functioning as side branches covers a wide frequency range. It is possible to exert a silencing effect. Further, since the plurality of ribs increase the rigidity of the intake silencer chamber, generation of radiated sound due to vibration can be effectively suppressed.
[0041]
According to the second aspect of the present invention, since the intake duct is prevented from interfering with the rib, there is no restriction on the size of the rib, and the degree of freedom in setting the size and shape of the auxiliary silencing chamber is reduced. To increase. In addition, since the wall surface forming the rib can be secured in the intake silencer chamber, the rigidity of the intake silencer chamber is also improved.
[0042]
Further, according to the third aspect of the present invention, interference between the intake duct and the rib is further effectively prevented, so that the degree of freedom in setting the size and shape of the auxiliary silencing chamber is further increased.
[0043]
According to the fourth aspect of the present invention, the gravity center position 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.
[0044]
According to the fifth aspect of the present invention, the intake duct communicates with the first resonance chamber through the opening, and the intake duct communicates with the second resonance chamber through the communication pipe. Noise in two different frequency bands can be attenuated by the two resonance chambers.
[Brief description of the drawings]
FIG. 1 is a side view of a front part of a vehicle body equipped with an intake silencer. FIG. 2 is a view taken in the direction of the arrow in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 5 is a perspective view of the entire apparatus. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 in FIG. FIG. 9 is a longitudinal cross-sectional view of a conventional intake silencer [Description of symbols]
11 First case half 11 ₁ First partition
11 ₂ Case upper wall (wall surface)
11 ₈ Case side wall (Inclined surface)
11 _{9 to} 11 ₁₁ ribs 12 second case half 12 ₁ second partition wall 13 mating surface 14 case 15 intake duct 15 ₈ opening 15 ₉ communication pipe 16 ₁ concave upper wall (wall surface)
17 1st resonance chamber (intake silencer chamber)
18 Second resonance chambers 19a to 19d Sub silencing chamber 22 Side frame (body frame)
23 Fender (wall surface)

Claims (5)

In the vehicle intake silencer, wherein both ends of the intake duct (15) communicating with the atmosphere and the engine respectively communicate with the interior of the intake silencer chamber (17),
At least a part of the intake silencer chamber (17) is configured by an inclined surface (11 ₈ ) along the vehicle body wall surface (23) inclined with respect to the vehicle body center plane (P), and the intake silencer chamber (17). A plurality of ribs (11 _{9 to} 11 ₁₁ ) respectively connected to the two wall surfaces (11 ₂ , 16 ₁ ) facing each other and the inclined surface (11 ₈ ) connecting these two wall surfaces (11 ₂ , 16 ₁ ). Are extended in parallel from the inclined surface (11 ₈ ) toward the intake duct (15), so that a plurality of sub-muffler chambers having mutually different resonance frequencies (inside the intake silencer chamber (17)) ( 19a to 19d), a vehicle intake silencer characterized by the above. The plurality of auxiliary silencing chambers (19a to 19d) and the intake duct (15) are respectively disposed on one side and the other side in the horizontal direction of the intake silencing chamber (17), and the plurality of ribs (11 ₉ to 11 ₉ ). 11. The vehicle intake silencer according to claim 1, wherein the tips of 11 ₁₁ ) are aligned in the longitudinal direction of the vehicle body. The cross-sectional shape of the intake duct (15) is an elliptical shape with a minor axis along the extending direction of the ribs (11 _{9 to} 11 ₁₁ ). Intake silencer for vehicles.   The intake silencer chamber (17) is supported by a vehicle body frame (22), and the intake duct (15) is disposed on the side of the intake silencer chamber (17) close to the vehicle body frame (22). The intake silencer for vehicles according to claim 2. A case (14) is formed by integrally joining the first case half (11) and the second case half (12) at the mating surface (13), from the inner surface of the first case half (11). The tip of the first partition (11 ₁ ) extending toward the mating surface (13) and the second partition (12 ₁ ) extending from the inner surface of the second case half (12) toward the mating surface (13). The first resonance chamber (17) serving as the intake silencer chamber and the second resonance chamber (18) different from the intake silencer chamber are partitioned by coupling the tip of the intake duct (15). The apparatus comprises an opening (15 ₈ ) communicating with the first resonance chamber (17) and a communication pipe (15 ₉ ) communicating with the second resonance chamber (18). 5. The vehicle intake silencer according to any one of 4.

Images