JP2003161216A - Intake unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake unit capable of simplifying assembling and reducing the number of parts. <P>SOLUTION: This intake unit 1 comprises an intake duct 2, an intake passage 3 connected to an intake duct 2, a resonator 6 branched and connected to the intake passage 3, an air cleaner 4 connected to the intake passage 3, and a connection pipe 5 connecting the air cleaner 4 and a throttle body. The intake passage 3, the resonator 6 and the air cleaner 4 are defined and arranged inside of a case composed of a box-shaped first case 70 having a partition 703 inside, and a box-shaped second case 71 mounted in a state that its opening 711 is opposite to an opening 701 of the first case 70, and having a partition 713 inside. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system, and more particularly to an intake system for introducing outside air into a cylinder of an engine.

[0002]

2. Description of the Related Art FIG. 5 shows an exploded view of a conventional intake device.
As shown in the figure, the intake device 100 includes an intake duct 101.
And an air cleaner portion 102, a resonator portion 103, and an air cleaner hose 104.

The air cleaner section 102 comprises an upper case 105, a lower case 106, and an air element 107. The upper case 105 has a box shape that opens downward. The lower case 106 has a box shape that opens upward. The air element 107 is sandwiched between the lower opening of the upper case 105 and the upper opening of the lower case 106. A cylindrical intake duct 101 is connected to the lower case 106. Further, a connection end on the upstream side of the air cleaner hose 104 is fastened and fixed to the upper case 105 by a hose clamp 108. A downstream connection end of the air cleaner hose 104 is fastened and fixed to a throttle body (not shown) by a hose clamp 109.

The air taken in from the intake duct 101 is
It flows into the lower case 106 of the air cleaner portion 102. The air that has flowed into the lower case 106 passes through the air element 107, whereby dust and the like are removed and purified. Purified air is in the upper case 105
And flows into the air cleaner hose 104. The air flowing into the air cleaner hose 104 then flows into the throttle body and is supplied to the combustion chamber of the engine via the intake manifold.

[0005]

Conventionally, the intake device 10 has been used.
Each member forming 0 was formed as a separate body. Therefore, the conventional intake device 100 has a large number of constituent parts. Therefore, the entire intake device 100 is heavy. Further, the installation space for the intake device 100 was large. Furthermore, the assembly was complicated.

The intake device of the present invention has been completed in view of the above problems. Therefore, an object of the present invention is to provide an intake device that is easy to assemble and has a small number of parts.

[0007]

(1) In order to solve the above-mentioned problems, an intake device of the present invention is provided with an intake duct, an intake passage connected to the intake duct, and a resonator branched and connected to the intake passage. An intake device comprising: a portion, an air cleaner portion connected to the intake passage, and a connecting pipe connecting between the air cleaner portion and the throttle body,
The intake passage, the resonator portion, and the air cleaner portion are box-shaped, and the first case portion having a partition wall inside and the box-shaped inner portion are arranged so that the openings of the first case portion face each other. A second case portion having a partition wall and a partition formed inside the case.

That is, the intake device of the present invention is one in which the intake passage, the resonator portion, and the air cleaner portion are integrally modularized inside the case. The case includes a first case part and a second case part. Both the first case portion and the second case portion are box-shaped and have an opening on one surface. Further, the first case part and the second case part have a partition wall inside.

When assembling the case, the first case portion and the second case portion are arranged so that the openings face each other and face each other. At this time, the inside of the case is partitioned by the partition wall of the first case portion and the partition wall of the second case portion to form a plurality of chambers. The intake system of the present invention utilizes these plurality of chambers as an intake passage, a resonator section, and an air cleaner section. The intake passage, the resonator portion, and the air cleaner portion are integrally arranged inside the case.

According to the intake device of the present invention, the intake passage, the resonator portion, and the air cleaner portion are all integrally arranged inside a single case. Therefore, at the time of attachment, the attachment of each member is completed simply by attaching the case to the vehicle body or the engine. Therefore, compared with the case where each member is attached to the vehicle body or engine separately,
Assembly of the intake device is easy. Further, the outer shell of each member is substituted by a front wall or a partition wall of the case. Therefore, the number of parts can be reduced as compared with the case where each member is attached separately.

(2) It is preferable that the intake passage has an expansion chamber at the end connected to the air cleaner.
When the intake air flows into the expansion chamber, the sound pressure of the intake sound decreases. Therefore, the mid-frequency or high-frequency component of the intake sound is reduced. Therefore, according to this configuration, it is possible to provide an intake device having a high effect of reducing intake noise. Further, according to this configuration, the expansion chamber is also modularized in the case. Therefore, the expansion chamber is formed together with the completion of the case.
Therefore, a step of separately disposing the expansion chamber at the time of assembling the intake device is unnecessary. That is, according to this configuration,
Despite the increase in the number of parts, the number of parts and the number of assembly steps do not increase.

(3) In the configuration of (2) above, it is preferable that at least one of the expansion chamber, the intake duct, and the intake passage has a ventilation member that communicates the inside and outside of the case. When the ventilation member is arranged in the expansion chamber, the high frequency component of the intake sound is reduced. Further, even if the ventilation member is arranged in the intake duct portion or the intake passage, the effect of reducing intake noise can be obtained. Therefore, according to the present configuration, it is possible to provide an intake device having a higher effect of reducing intake noise.

(4) It is preferable that the case has a vibration damping member for suppressing transmission of vibrations from the adjacent engine. A cylinder head of an engine, for example, is arranged adjacent to the periphery of the case. Therefore, in this structure, a vibration damping member that suppresses vibration transmission from the engine is attached to the case. According to this configuration, it is possible to prevent the vibration from the engine from being transmitted to the intake device.

(5) Preferably, the first case portion or the second case portion has a detachable element exchange cover at the portion containing the air cleaner portion. An air element that purifies intake air is arranged in the air cleaner portion. According to this configuration, the air element can be replaced by simply removing the element replacement cover. That is, it is not necessary to disassemble the case when replacing. Therefore, it has excellent maintainability.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an intake device of the present invention will be described below.

(1) First Embodiment First, an intake passage including the intake device of this embodiment will be described. FIG. 1 shows an intake flow path diagram of the intake device 1 of the present embodiment. In FIG. 1, the left side is the upstream side and the right side is the downstream side. The intake device 1 includes an intake duct 2, an intake passage 3, an air cleaner portion 4, and a connecting pipe 5 from the upstream side.
In the middle of the intake passage 3, a first resonator 60 and a second resonator 61 are branched and connected. The first resonator 60 and the second resonator 61 constitute the resonator section 6. An expansion chamber 30 having a ventilation member 31 is arranged at the downstream end of the intake passage 3. Further, the air cleaner portion 4 is partitioned by an air element 40 into an upstream chamber 41 and a downstream chamber 42. Further, a throttle body 90 is provided on the downstream side of the connecting pipe 5.
, An intake manifold 91, and cylinders # 1 to # 4 are arranged. In the figure, the members surrounded by the inner dotted line, that is, the intake passage 3, the resonator portion 6, the expansion chamber 30, and the air cleaner portion 4 are arranged inside the case. Further, in the figure, the members surrounded by the inner dotted line and the outer dotted line, that is, the intake duct 2 and the connecting pipe 5 are installed on the outer surface of the case.

The intake air flows from the intake duct 2 into the intake passage 3. Then, the intake air passes through the first resonator 60, the second resonator 61, and the expansion chamber 30 and flows into the upstream chamber 41 of the air cleaner unit 4. The intake sound is reduced by the intake air passing through the first resonator 60, the second resonator 61, and the expansion chamber 30. Subsequently, the intake air passes through the air element 40 of the air cleaner portion 4 and flows into the downstream chamber 42. At this time, dust and dirt in the intake air are filtered out. Then, the intake air flows into the cylinder 92 through the connecting pipe 5, the throttle body 90, and the intake manifold 91.

Next, the structure of the intake device of this embodiment will be described. FIG. 2 shows a perspective view of the intake device 1 of the present embodiment. The intake device 1 is mounted above the cylinder head (not shown) of the engine.

The case 7 forms the outer shell of the intake device 1. The case 7 includes a first case portion 70 and a second case portion 71. Both the first case portion 70 and the second case portion 71 are made of resin and are manufactured by injection molding. A cylindrical pipe 74 is formed so as to project from the side surface of the case 7. A ridge rib (not shown) having a predetermined length is formed on the outer peripheral surface of the tip of the pipe 74 to give a function of preventing the intake duct 2 from coming off.

The intake duct 2 is made of rubber or thermoplastic elastomer and has a cylindrical shape with a bellows.
A concave groove is formed on the inner peripheral surface of the intake duct 2 so as to be engageable with the rib at the tip of the pipe 74. The intake duct 2 is attached to the pipe 74. Specifically, the intake duct 2 is attached to the pipe 74 by inserting the pipe 74 into the intake duct 2 and twisting the pipe 74 at a predetermined angle to engage the concave and convex portions of both members. A cylindrical connecting pipe 5 is formed so as to project from the side surface of the case 7.
A rubber seal ring 50 is attached to the tip of the connecting pipe 5 to ensure the sealing property with the throttle body 90.

A plurality of engagement seats 73 are formed below the side surface of the first case portion 70. An engagement hole 730 is formed in each engagement seat 73. In this engagement hole 730,
A ring-shaped grommet 72 made of rubber is press-fitted. The grommet 72 is included in the vibration damping member of the present invention.

FIG. 3 shows an exploded view of the intake device 1 of this embodiment. The first case portion 70 has a box shape. An opening 701 bordered by a flange 700 is formed on the upper end surface of the first case portion 70. In addition, the first case portion 70
A first semi-circular pipe portion 702 is projectingly arranged on the side surface of the. Further, a partition wall 703 that partitions the inside of the first case portion 70 is provided upright from the inner bottom surface of the first case portion 70.

The second case portion 71 has a box shape.
The second case portion 71 is arranged above the first case portion 70. A flange 71 is provided on the lower end surface of the second case portion 71.
An opening 711 bordered by 0 is formed. A second semicircular pipe portion 712 is arranged on the side surface of the second case portion 71 so as to project. The position of the second semicircular pipe portion 712 corresponds to the position of the first semicircular pipe portion 702.
A partition wall 713 (indicated by a dotted line in FIG. 3) that partitions the inside of the second case portion 71 is provided upright from the inner bottom surface of the second case portion 71. The position of the partition wall 713 corresponds to the position of the partition wall 703.

The intake passage 3, the resonator portion 6, and the air cleaner portion 4 are arranged inside the case 7 in a state of being partitioned by a partition wall 703 and a partition wall 713. The intake passage 3 has a cylindrical shape curved at 90 ° and has an intake duct 2
It is connected to the. A rectangular parallelepiped expansion chamber 30 is arranged at the downstream end of the intake passage 3. A ventilation member 31 is arranged on the bottom wall of the expansion chamber 30. Ventilation member 31
Is a non-woven fabric and has a rectangular plate shape. The ventilation member 31 communicates the inside and outside of the first case portion 70. The ventilation member 31 is integrally formed with the first case portion 70 by insert molding.

The resonator section 6 comprises a first resonator 60 and a second resonator 61. Of these, the first resonator 60 has a prismatic shape and is arranged in the middle of the case 7 in the longitudinal direction. Further, the first resonator 60 is juxtaposed with the expansion chamber 30. The second resonator 61 has a rectangular parallelepiped shape and is arranged at one end in the longitudinal direction of the case 7. Also,
Both the first resonator 60 and the second resonator 61 are arranged branching from the curved upstream portion of the intake passage 3.

The air cleaner portion 4 is arranged at the other end of the case 7 in the longitudinal direction. The air cleaner section 4 includes an upstream chamber 41, a downstream chamber 42, and an air element 40.
The upstream chamber 41 has a rectangular parallelepiped shape and is arranged in the second case portion 71. The upstream chamber 41 is connected to the expansion chamber 30. On the other hand, the downstream chamber 42 has a rectangular parallelepiped shape and is arranged in the first case portion 70. And the upstream chamber 41
The downstream chamber 42 and the downstream chamber 42 are partitioned by the air element 40. The air element 40 has a rectangular plate shape. The air element 40 is formed of a non-woven fabric folded into a pleated shape. The connecting pipe 5 connects between the downstream chamber 42 and the throttle body (not shown).

Next, a method of assembling the intake device 1 of this embodiment will be described. In the assembling method, first, in the first case portion 70 previously produced by injection molding,
Assemble each member. Specifically, first, the grommet 72 is press-fitted into the engagement hole 730 of the engagement seat 73. Then, next, a rubber seal ring 50 is attached to the tip of the connecting pipe 5. Then, the air element 40 is arranged above the downstream chamber 42. A sponge-like seal member (not shown) is arranged on the upper surface of the flange 700.

Next, the first case portion 7 in which each member is assembled
The second case portion 71, which has been manufactured by injection molding in advance, is attached to 0. Specifically, first, the flange 700 and the flange 710 are face-to-face, and the first case portion 70 is covered with the second case portion 71. At this time, the outer edge of the air element 40 and the seal member are sandwiched between the first case portion 70 and the second case portion 71. When the second case portion 71 is covered on the first case portion 70, the first semicircular pipe portion 702 and the second semicircular pipe portion 712 are combined to form the pipe 74. Therefore, the pipe 74 is inserted into the intake duct 2 and locked. Then, the face-aligned flange 700 and the flange 710 are clamped and fixed by a plurality of clamps (not shown). By fixing with a clamp,
The seal member is compressed, and the sealing property between the first case portion 70 and the second case portion 71 is secured. Further, the air element 40 is fixed. Then, the intake passage 3, the resonator portion 6, and the air cleaner portion 4 are completed. Finally, the protrusion (not shown) formed on the upper surface of the cylinder head is pressed into the grommet 72. By this press-fitting, the intake device 1 is mounted on the cylinder head.

According to the intake device 1 of this embodiment, the intake passage 3, the resonator portion 6, and the air cleaner portion 4 are formed at the same time when the first case portion 70 and the second case portion 71 are assembled. Therefore, the assembly is easy. The intake passage 3, the resonator portion 6, and the air cleaner portion 4 are modularized in the case 7. Therefore, it has a small number of parts, is lightweight, and has excellent space. Further, according to the intake device 1 of the present embodiment, the expansion chamber 30 including the ventilation member 31 is arranged. Therefore, the intake sound in all frequency ranges can be effectively reduced. Further, according to the intake device 1 of the present embodiment, the first case portion 70
A grommet 72 is inserted between the cylinder head and the cylinder head. Therefore, it is easy to suppress the transmission of vibration from the engine. The intake device 1 is mounted on the cylinder head with one touch via the grommet 72. Therefore, it is also excellent in mounting workability.

(2) Second Embodiment The difference between this embodiment and the first embodiment is that the second case portion 71 is welded to the first case portion 70. A detachable element exchange cover is arranged on a part of the second case portion 71. Therefore, only the differences will be described in this section.

FIG. 4 shows an exploded view of the intake device 1 of this embodiment. The members corresponding to those in FIG. 3 are indicated by the same symbols. As shown in the figure, the element replacement cover 4 is provided at a portion of the second case portion 71 where the air cleaner portion 4 is present.
3 are arranged. The element exchange cover 43 is locked to the first case portion 70 by a plurality of clamps (not shown). Therefore, the element replacement cover 4
3 is detachable from the first case portion 70. The air element 40 is sandwiched and fixed between the element exchange cover 43 and the first case portion 70. The first case portion 70 and the second case portion 71 are welded.

According to this embodiment, the air element 40
When exchanging, it is not necessary to remove the entire second case portion 71. That is, the air element 40 can be replaced by simply removing the element replacement cover 43. Therefore, the intake device 1 of the present embodiment has excellent maintainability.

(3) Others The embodiments of the intake device of the present invention have been described above.
However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements can be made by those skilled in the art.

For example, the intake passage 3 inside the case 7
The layout of the resonator portion 6, the air cleaner portion 4, and the like is not particularly limited. Further, although the ventilation member 31 is arranged in the expansion chamber 30 in the above embodiment, the ventilation member 30 may not be arranged. Further, the expansion chamber 30 itself may not be arranged. Further, in the above embodiment, the resonator unit 6 is composed of the first resonator 60 and the second resonator 61, but the number of resonators may be one.
Alternatively, it may be three or more. Further, in the above embodiment, the connecting pipe 5 is projected from the side surface of the first case portion 70. However, you may make it protrude from the bottom face of the 1st case part 70. That is, the arrangement of the connecting pipe 5 may be changed depending on the direction of the throttle body. In the above embodiment, the rubber grommet 72 is used as the vibration damping member.
However, the material and shape of the damping member are not particularly limited. Further, in the above-described embodiment, the intake device 1 is arranged on the cylinder head, but the arrangement place is not particularly limited. Further, in the above embodiment, the intake duct 2 and the pipe 74 are connected by the rib engagement mechanism, but they may be connected by the press-fitting mechanism. Alternatively, the connection may be made by a clamp fastening mechanism. Further, although the element exchange cover 43 is arranged in the second case portion 71 in the second embodiment, it may be arranged in the first case portion 70. Further, a ventilation member may be disposed in the intake duct 2 by insert molding. In this way, air column resonance in the intake duct 2 can be suppressed. Therefore, the intake noise can be further reduced.

[0035]

According to the present invention, it is possible to provide an intake device which is easy to assemble and has a small number of parts.

[Brief description of drawings]

FIG. 1 is an intake passage diagram of an intake device of a first embodiment.

FIG. 2 is a perspective view of the intake device of the first embodiment.

FIG. 3 is an exploded view of the intake device of the first embodiment.

FIG. 4 is an exploded view of an air intake device according to a second embodiment.

FIG. 5 is an exploded view of a conventional intake device.

[Explanation of symbols]

1: intake device, 2: intake duct, 3: intake passage, 30:
Expansion chamber, 31: ventilation member, 4: air cleaner part, 40:
Air element, 41: upstream chamber, 42: downstream chamber, 4
3: Element exchange cover, 5: Connection pipe, 50: Rubber seal ring, 6: Resonator part, 60: First resonator, 61: Second resonator, 7: Case, 70: First case part, 700: Flange, 701: Opening, 702:
1st semicircular pipe part, 703: partition wall, 71: 2nd case part, 710: flange, 711: opening, 712: 2nd semicircular pipe part, 713: partition wall, 72: grommet (damping member), 73: Engagement seat, 730: engagement hole, 74: pipe,
90: throttle body, 91: intake manifold, 92: cylinder.

Continued front page    (72) Inventor Isao Takada             Aichi Prefecture Kasuga-cho, Nishikasugai-gun Ochiai character Nagahata 1             Address within Toyoda Gosei Co., Ltd.

Claims (5)

[Claims] 1. An intake duct, an intake passage connected to the intake duct, a resonator portion branched and connected to the intake passage, and an air cleaner portion connected to the intake passage.
An intake device comprising a connecting pipe connecting between the air cleaner portion and the throttle body, wherein the intake passage, the resonator portion and the air cleaner portion are:
A box-shaped first case part having a partition wall inside, and a box-shaped second case part arranged so that the opening of the first case part faces the opening and having a partition wall inside The air intake device is characterized in that the air intake device is partitioned inside the case. 2. The intake device according to claim 1, wherein the intake passage has an expansion chamber at a connection end portion with the air cleaner portion. 3. The intake device according to claim 2, wherein at least one of the expansion chamber, the intake duct, and the intake passage has a ventilation member that communicates the inside and outside of the case. 4. The intake system according to claim 1, wherein the case has a vibration damping member that suppresses transmission of vibration from an adjacent engine. 5. The intake device according to claim 1, wherein the first case portion or the second case portion has a removable element exchange cover at a portion including the air cleaner portion.