JP2003161217A - Intake unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake unit integrated with an engine cover, and capable of simplifying assembling, reducing the number of parts and improving maintenance workability. <P>SOLUTION: This intake unit 11 comprises an air cleaner 7 having a cool air intake duct 3, the engine cover 2 having a connection port 21 connected to the cool air intake duct 3, an intake duct 4 connected to the connection port 21, a first resonator 5 branched and connected to the intake duct 4, a first case 70 connected to the intake duct 4, a second case 71, an element 72 for partitioning the first case 70 and the second case 71, and a connection pipe 8 for connecting the second case 71 and a throttle body. The engine cover 2 is used as a part of an inner wall of an intake duct 4 and the first resonator 5. The second case 71 is integrated with the engine cover 2. The first case 70 is detachable from the engine cover 2. <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 device, and more particularly, to an intake device that is arranged integrally with an engine cover of an automobile or the like.

[0002]

2. Description of the Related Art An intake device is a device for sucking air supplied to a combustion chamber of an engine. FIG. 9 shows an exploded view of a conventional intake device. As shown in the figure, the conventional intake device 10
0 is the engine cover 200 in the engine room
It is located in front of. The intake device 100 includes an intake duct 101, an air cleaner portion 102, and a resonator 10.
3 and an air cleaner hose 104.

The air cleaner section 102 comprises an upper case 105, a lower case 106 and an element 107. The upper case 105 has a box shape that opens downward. An air flow meter (not shown) is attached to the upper case 105. Also lower case 106
Has a box shape that opens upward. Element 107
Is the lower opening of the upper case 105 and the lower case 10.
It is sandwiched between the upper opening 6 and the upper opening. Lower case 10
A cylindrical air intake duct 101 is connected to 6. 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 is the element 1
By passing through 07, dust and the like are removed and purified. The purified air flows into the air cleaner hose 104 through the upper case 105. 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. The intake noise is reduced by the resonator 103 or the like attached to the air cleaner hose 104.

[0005]

However, the conventional intake system 100 is assembled in the engine room as a separate body from the engine cover 200. Therefore, it is necessary to secure a space for assembling the intake device 100 in the engine room separately from the engine cover 200. Further, in the conventional intake device 100, members such as hose clamps 108 and 109, which are not directly related to the intake of air, are provided. Therefore, the number of parts is large and the assembling property is poor.

The intake system 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 compactly arranged integrally with an engine cover, 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 includes a cool air intake duct, an engine cover having a connection port connected to the cool air intake duct, and a connection port. An intake duct connected to the intake duct, a first resonator arranged to surround the intake duct, and branched and connected to the intake duct; a first case connected to the intake duct; a second case; and a first case. An intake device comprising an air cleaner portion having an element separating the second case, and a connecting pipe connecting the second case and the throttle body, wherein the intake duct and the first resonator have an engine cover. It is arranged on the back side of the engine cover as a part of the inner wall, and one of the first case and the second case is arranged integrally with the engine cover, and the other is Characterized in that it is detachably disposed from the front side of the Njinkaba.

That is, the intake system of the present invention has the engine cover as a part of its constituent parts. Then, it is assembled integrally with the engine cover. According to the intake device of the present invention, it is not necessary to secure a space for separately assembling the intake device in the engine room independently of the engine cover. Therefore, it has excellent space characteristics.

Further, in the intake device of the present invention, the intake duct and the first resonator are arranged on the back surface side of the engine cover by utilizing the engine cover as a part of the inner wall. Since these members are arranged so as to be hidden by the engine cover, they are not exposed in the engine room. Therefore, the air intake device of the present invention is excellent in design.

Further, in the intake system of the present invention, the first resonator is arranged so as to surround the intake duct. The first resonator is branched from the intake duct and connected. According to the intake device of the present invention, the first resonator and the intake duct are arranged in a so-called double cylinder shape.
Therefore, it is excellent in space. The connection between the first resonator and the intake duct can be ensured, for example, by forming a fine hole in the outer peripheral surface of the intake duct. Therefore, the structure is simple as compared with the case where a resonator is arranged separately from the intake duct and these members are connected by a pipe or the like.

Further, in the intake system of the present invention, one of the first case and the second case forming the air cleaner portion is arranged integrally with the engine cover. The other case is arranged so as to be detachable from the front surface side of the engine cover. The engine cover is arranged, for example, to cover the upper surface of the cylinder head of the engine. Therefore, when the air cleaner portion is arranged integrally with the engine cover, maintenance of the air cleaner portion becomes a problem. That is, the element forming the air cleaner portion is a member that requires periodic maintenance. For this reason, it is desirable that the air cleaner section can be easily disassembled even by a non-specialized operator.

However, if the air cleaner portion is arranged on the back surface side of the engine cover like the intake duct and the first resonator, the engine cover itself must be removed when disassembling the air cleaner portion. Therefore, maintainability is poor.

In this respect, according to the intake device of the present invention, when the air cleaner portion is disassembled, the case that is detachably arranged (hereinafter, appropriately referred to as "detachment side case").
Just remove it from the engine cover. In other words, there is no need to remove the engine cover itself. Therefore, the intake system of the present invention has excellent maintainability.

(2) It is preferable that the engine further comprises a second resonator which is connected to the upstream side of the element and is arranged on the back side of the engine cover as a part of the inner wall. That is, in this configuration, the second resonator is arranged separately from the first resonator. The second resonator is a member on the upstream side of the element, that is, the intake duct, the first resonator,
It is connected to a portion of the air cleaner portion that is on the dirty side of the element. According to this configuration, intake noise can be further reduced by the amount of the second resonator. Further, the second resonator is arranged on the back surface side of the engine cover with the engine cover as a part of the inner wall, similarly to the first resonator. For this reason, the intake device of this configuration is excellent in space.

(3) Preferably, the surface of the engine cover and the surface of the one of the first case and the second case that is detachably arranged from the surface side of the engine cover are arranged substantially flush with each other. It is better to have a configured configuration. That is, in this structure, the engine cover and the detachable case are arranged substantially flush with each other. The engine cover and the detachable case are exposed in the engine room.
Therefore, if there is a step or the like between the surface of the engine cover and the surface of the detachable side case, a cheap impression is given to the design and the appearance is poor. Therefore, in this configuration, the surface of the engine cover and the surface of the detachable side case are substantially flush with each other.
Both members are arranged. The intake device having this configuration has a good appearance and excellent design.

(4) It is preferable that the cool air intake duct should have a ventilation member on the pipe wall. That is, in this configuration, the ventilation member that connects the inside and outside of the pipe wall is arranged on the pipe wall of the cool air intake duct. The ventilation member allows the intake pulsation pressure existing in the intake duct to escape to the outside of the pipe wall. Therefore, according to this configuration, intake noise can be further reduced.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an intake device of the present invention will be described below. FIG. 1 shows an exploded view of the intake device of this embodiment. Further, FIG. 2 shows a view of the intake device of the present embodiment as seen from below. As shown in the figure, the intake device 1 of the present embodiment includes an engine cover 2, a cool air intake duct 3, an intake duct 4, a first resonator 5, a second resonator 6, an air cleaner portion 7 and a connecting pipe 8.

The engine cover 2 is made of PP resin and has a dish shape that opens downward. A square cylinder 20 is arranged so as to project from the side wall of the engine cover 2. A connection port 21 is formed inside the rectangular tube 20. This connection 21
Penetrates the inside and outside of the engine cover 2.

The cool air intake duct 3 is made of a hard resin or a soft resin and has a rectangular tube shape having a bellows portion at one end. A square tube 20 is press-fitted into the other end of the cool air intake duct 3. By this press fitting,
The cool air intake duct 3 is connected to the engine cover 2. The cool air intake duct 3 has a ventilation member 30 on the bottom wall. FIG. 3 shows an enlarged view of the cool air intake duct 3 viewed from below. The ventilation member 30 is P
It is made of ET non-woven fabric and has a rectangular plate shape. The ventilation member 30 communicates the inside and outside of the cool air intake duct 3. By disposing the ventilation member 30, the intake pulsating pressure existing in the intake duct can be released to the outside of the pipe wall. The ventilation property of the ventilation member 30 is tuned so as to produce a transmitted sound equivalent to the intake sound. Therefore, intake noise can be effectively reduced.

On the back surface of the engine cover 2, as shown in FIG. 2, an intake duct 4, a first resonator 5 and a second resonator 6 are arranged in parallel. Of these, the intake duct 4
Is made of PP resin and has a split body shape obtained by splitting the pipe in the axial direction. That is, the axial cross section of the intake duct 4 is
It has a U-shape that opens to the engine cover side. The upstream connection end of the intake duct 4 is connected to the connection port 21 from the back surface side of the engine cover 2. FIG. 4 shows an axial cross-sectional view of the intake duct and the first resonator. As shown in the figure, the axially open end 40 of the intake duct 4 is inserted between the two rows of ribs 22 provided upright on the back surface of the engine cover 2. Therefore, generation of a gap between the engine cover 2 and the intake duct 4 due to variation in molding is absorbed,
The required airtightness can be secured. Then, the axially open end 40 is welded to the back surface of the engine cover 2 at several places by heat staking while being inserted between the ribs 22. A large number of pores 41 are formed on the side wall of the intake duct 4 so as to be arranged in the axial direction.

The first resonator 5 is made of PP resin and has a box shape that opens toward the engine cover. That is, the cross section of the first resonator 5 has a U-shape that opens toward the engine cover. Specifically, as shown in FIG. 4, the axially open end 50 of the first resonator 5 is inserted between the ribs 23 provided upright on the back surface of the engine cover 2. Therefore, it is possible to absorb the occurrence of the gap between the engine cover 2 and the first resonator 5 due to the variation in molding, and to secure the necessary airtightness. Further, the axially open end 50 is welded to the back surface of the engine cover 2 at several places by heat staking while being inserted between the ribs 23.
The intake duct 4 and the first resonator 5 communicate with each other through the pores 41. Therefore, the intake noise of the intake duct 4 is reduced by the first resonator 5. It is possible to tune the muffling characteristics of the first resonator 5 by adjusting the diameter and number of the pores 41, the volume of the first resonator 5, and the like.

Returning to FIG. 1 and FIG. 2, the second resonator 6 is made of PP resin and has a box shape opening to the engine cover side. Further, a thin tube 60 is projected from the side surface of the second resonator 6. The second resonator 6 is provided with a second case 71, which will be described later, via the thin tube 60.
It is connected to the dirty side. The second resonator 6
Like the first resonator 5, it is also mounted on the back surface of the engine cover 2 by inter-rib insertion and heat staking.

First resonator 5 and second resonator 6
As shown in FIG. 2, the lower surface of the bush 10 is made of rubber.
Is installed in total of four. FIG. 5 shows an enlarged cross-sectional view of the bush attached to the first resonator. As shown in the figure, the bush 10 has a cylindrical shape. Bush 10
A pin 90 formed on the cylinder head 9 of the engine is press-fitted on the inner peripheral side of the. The bush 10 connects the first resonator 5 and the second resonator 6 to the cylinder head 9
It is fixed to. Further, the vibration from the cylinder head 9 is suppressed from being transmitted to the first resonator 5, the second resonator 6 and the engine cover 2.

Returning to FIGS. 1 and 2, the air cleaner portion 7 includes the first case 70, the second case 71, and the element 7.
2 and. The first case 70 is made of PP resin and has a box shape. Further, the first case 70 is locked to the second case 71 by a clamp (not shown) and can be freely attached and detached. Therefore, the intake device 1 of the present embodiment has excellent maintainability of the element 72. A sponge-like seal member (not shown) is sandwiched between the first case 70 and the second case 71. The sealing member ensures the airtightness of the first case 70 and the second case 71. An opening is formed on the lower surface of the first case 70 so as to be surrounded by the flange 700. In addition, a rectangular parallelepiped through hole 701 is formed on the side surface of the first case 70. The first case 70 is connected to the intake duct 4 via this passage 701. FIG. 6 shows a side view near the first case of the intake device 1 of the present embodiment. A step 24 (indicated by a dotted line in the figure) is provided at the end of the engine cover 2 on the first case side.
Are arranged. On the other hand, a flange 705 is arranged at the engine cover side end of the first case 70. The flange 705 covers the step 24. In the air intake device 1 of the present embodiment, the engine cover 2 and the first case 70 are face-aligned with each other by the step 24 and the flange 705. Therefore, the engine cover 2 and the first case 70 are substantially flush with each other. Therefore, the air intake device 1 of the present embodiment is excellent in design. The mating surface between the step 24 and the flange 705 has a step shape. Therefore, the space above the engine cover 2 and the space inside the air cleaner portion 7 are not in linear communication. Therefore, the intake device 1 of the present embodiment is excellent in the rainwater adhesion prevention property to the element 72.

Returning to FIGS. 1 and 2, the second case 71
Is made of PP resin and has a box shape. The second case 71 is formed integrally with the engine cover 2 by injection molding. An opening 703 is formed on the upper surface of the second case 71 so as to be surrounded by the flange 702. Further, a cylindrical nipple 704 is provided on the side surface of the second case 71 so as to project. The nipple 704 communicates with the PCV circuit passing through the inside of the cylinder head cover on the engine side. A partition 710 is provided upright inside the second case 71. The partition 710 allows the large room 71
It is divided into 1 and small room 712. To the small chamber 712, the thin tube 60 of the second resonator 6 described above is connected. On the other hand, a rectangular plate-shaped element 72 is arranged above the large room 711. The element 72 is PE
It is formed by bending several layers of T non-woven fabric.
The element 72 is sandwiched and fixed between the first case 70 and the second case 71.

The connecting pipe 8 is made of PP resin and is formed so as to project downward from the lower wall of the second case 71.
A protruding pipe 80 is arranged at the upper end of the connecting pipe 8. That is, the projecting pipe 80 projects inward of the second case 71. The projecting projecting pipe 80 suppresses the occurrence of fluttering noise on the inner wall of the second case 71 due to the intake air that has passed through the element 72. FIG. 7 shows an enlarged sectional view of the connecting pipe. As shown in the figure, a rubber elastic seal 81 is provided on the downstream side of the connecting pipe 8. Two ring-shaped lip portions 82 are arranged in series on the inner peripheral side of the elastic seal 81. By this lip portion 82, the connecting pipe 8 and the throttle body 91
It is possible to secure the sealing property with.

Assembly of the intake device 1 having the above-described structure is mainly performed by press fitting or fitting. Therefore, the intake device 1 has excellent workability in assembling. Moreover, since each member is assembled without using a fastener such as a hose clamp, the number of parts constituting the intake device 1 can be reduced. FIG. 8 shows an external view of the intake device 1 of this embodiment. As shown in the figure, the intake device 1 includes an engine cover 2
Is integrally provided on the back side of the. Therefore, it is not necessary to separately secure a space for disposing the intake device 1 in the engine room. Therefore, it has excellent space characteristics.
Further, most of the components of the intake device 1 are not exposed in the engine room. Therefore, it is excellent in terms of design.

The embodiment of the intake device 1 of the present invention has been described above. However, various modifications and applications that can be made by those skilled in the art can be implemented. For example,
The resin forming each member of the intake device 1 may be a PA resin or the like instead of the PP resin. In addition, the intake duct 4,
The method of fixing the first resonator 5 and the second resonator 6 to the engine cover 2 is not limited to heat staking, but may be ultrasonic welding or mechanical engagement such as claw fitting. The connecting pipe 8 may be separate from the second case 71.

[0029]

According to the present invention, it is possible to provide an intake device which is compactly arranged integrally with an engine cover, is easy to assemble, has a small number of parts, and has excellent maintainability of an air cleaner portion.

[Brief description of drawings]

FIG. 1 is an exploded view of an intake device of the present embodiment.

FIG. 2 is a view of the intake device of the present embodiment seen from below.

FIG. 3 is a view of the cool air intake duct of the present embodiment seen from below.

FIG. 4 is an axial cross-sectional view of the intake duct and the first resonator of the present embodiment.

FIG. 5 is an enlarged cross-sectional view of a bush attached to the first resonator of the present embodiment.

FIG. 6 is a side view of the vicinity of the first case of the intake device of the present embodiment.

FIG. 7 is an enlarged cross-sectional view of the connection pipe of the present embodiment.

FIG. 8 is an external view of the intake device of the present embodiment.

FIG. 9 is an exploded view of a conventional intake device.

[Explanation of symbols]

1: Intake device, 2: Engine cover, 20: Square cylinder, 2
1: connection port, 22: rib, 23: rib, 24: step,
3: Cool air intake duct, 30: Ventilation member,
4: Intake duct, 40: Open end in the direction perpendicular to the axis, 41: Pore,
5: first resonator, 50: open end in the direction perpendicular to the axis, 6: second resonator, 60: thin tube, 7: air cleaner part, 70:
First case, 700: flange, 701: through hole, 70
2: flange, 703: opening, 704: nipple, 70
5: flange, 71: second case, 710: partition wall, 71
1: Large room, 712: Small room, 72: Element, 8:
Connection pipe, 80: protruding pipe, 81: elastic seal, 8
2: Lip part, 9: Cylinder head, 90: Pin, 9
1: Throttle body, 10: Bush.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Isao Takada             Aichi Prefecture Kasuga-cho, Nishikasugai-gun Ochiai character Nagahata 1             Address within Toyoda Gosei Co., Ltd. F-term (reference) 3G024 AA72 BA29 FA15

Claims (4)

[Claims] 1. A cool air intake duct, an engine cover having a connection port connected to the cool air intake duct, an intake duct connected to the connection port, and an air intake duct disposed around the intake duct. An air cleaner part having a first resonator branched and connected to the duct, a first case connected to the intake duct, a second case, and an element separating the first case and the second case. An intake device comprising a connecting pipe connecting the second case and the throttle body, wherein the intake duct and the first resonator have the engine cover as a part of an inner wall and a rear surface of the engine cover. Of the first case and the second case, one of the first case and the second case is disposed integrally with the engine cover, and the other is detachable from the front surface side of the engine cover. An intake device characterized in that it is arranged as possible. 2. The intake device according to claim 1, further comprising a second resonator which is connected to the upstream side of the element and is arranged on the back surface side of the engine cover with the engine cover as a part of an inner wall. . 3. The surface of the engine cover and the surface of one of the first case and the second case, which is detachably arranged from the surface side of the engine cover, are substantially flush with each other. The intake system according to claim 1, wherein the intake system is provided. 4. The intake device according to claim 1, wherein the cool air intake duct includes a ventilation member on a pipe wall.