JP3864533B2 - Intake device for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in the arrangement of an air cleaner case, a cap member, and a fuel supply pipe in an intake device for an internal combustion engine. The intake device is configured such that an intake system component is configured as a one-unit assembly (module structure). It is suitable for use in.
[0002]
[Prior art]
Conventionally, the magazine “Nikkei Mechanical 'April 1997 issue” describes an intake device in which intake system components are configured as a single unit assembly (module structure). The cap member is disposed at the top, an air cleaner case is disposed below the cap member, and an intake manifold is disposed below the air cleaner case. A fuel supply pipe for supplying fuel to the fuel injection valve is sandwiched and fixed by the mating surface of the air cleaner case and the intake manifold.
[0003]
[Problems to be solved by the invention]
However, according to the above prior art, the space on the clean side of the air cleaner (the space into which clean air filtered by the air cleaner element flows) is necessarily located below the air cleaner element. In addition, when removing the air cleaner element, there is a problem that foreign matters such as dust are likely to enter the clean side.
[0004]
The present invention has been made in view of the above points, and an object of the present invention is to suppress foreign matter from being mixed into the clean side of the air cleaner when the air cleaner element is attached or detached.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the air cleaner case (13) and the cap member (14) accommodating the air cleaner element (15) for filtering the intake air are arranged side by side in a substantially horizontal direction, An intake manifold pipe (24) is disposed below the air cleaner case (13), and fuel is supplied to the fuel injection valve (26) between the bottom surface of the air cleaner case (13) and the top surface of the intake manifold pipe (24). A fuel supply pipe (29) for supplying the fuel is sandwiched and fixed.
[0006]
According to this, the clean side space (18) of the air cleaner (12) can be positioned laterally in the horizontal direction with respect to the dust side space (17).
Therefore, when the cap member (14) is removed from the case (13) and the air cleaner element (15) is detached for maintenance of the air cleaner element (15), foreign matter such as dust in the dust side space (17) is removed. It is possible to prevent foreign matter from entering the clean side space (18) even if it falls downward.
[0007]
Further, since the fuel supply pipe (29) is sandwiched and fixed between the bottom surface portion of the air cleaner case (13) and the upper surface portion of the intake manifold pipe (24), when assembling the fuel supply pipe (29), The fuel supply pipe (29) is placed on the upper surface of the intake manifold pipe (24), and the fuel is supplied by simple means of pressing the upper surface of the fuel supply pipe (29) with the bottom surface of the air cleaner case (13). The tube (29) can be securely held and fixed.
[0008]
Moreover, since the intake manifold pipe (24) is disposed below the air cleaner case (13), the intake air flows in the substantially horizontal direction through the cap member (14) and the case (13) of the air cleaner (12). An intake path in which intake air flows downwardly in a curved manner through the intake manifold pipe (24) can be configured. Accordingly, there is no downward U-turn part in the middle of the intake path, and the intake air can flow smoothly from the upper side to the lower side to be supplied to the intake port (10b) of the internal combustion engine. There is no fear of staying.
[0009]
In addition, with such an arrangement, the overall size of the intake device can be made relatively small.
In the present invention, the “substantially horizontal direction” does not mean a strict horizontal direction, and, as will be described later, in a range that does not hinder the purpose of preventing contamination of the clean side space (18). It is also used as a term that includes a direction inclined from the horizontal direction within a certain angle range.
[0010]
Specifically, according to the present invention, the presser portion (31) is formed on the bottom surface portion of the air cleaner case (13) and the support base (30) is formed on the upper surface portion of the intake manifold pipe (24). The fuel supply pipe (29) can be sandwiched and fixed by the mating surface (32) of the pressing part (31) and the support base (30).
[0011]
Further, according to the present invention, the mating surface (32) of the pressing portion (31) and the support base (30) is arranged so as to extend in a substantially horizontal direction, and the air cleaner case (13) and the cap are provided. It can implement suitably by setting it as the structure which arrange | positions the mating surface (16) with a member (14) so that it may extend in a substantially perpendicular direction, and arrange | positions both mating surfaces (16, 32) in a substantially orthogonal state.
[0012]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment in which the present invention is applied to an intake device for an internal combustion engine for vehicle travel. The internal combustion engine 10 is, for example, a three-cylinder type, and the direction of the cylinder row is the plane of FIG. Vertical direction. 10a is a cylinder head of the internal combustion engine 10, and 10b is an intake port.
[0014]
An intake device 11 according to the present invention is disposed immediately adjacent to the side of the internal combustion engine 10. The intake device 11 is composed of a one-unit assembly (module structure) in which various intake system components described later are integrated in a compact manner.
In the intake device 11, an air cleaner 12 is disposed above a portion near the internal combustion engine 10, and the air cleaner 12 includes an air cleaner case 13, a cap member 14, and an air cleaner element 15. Here, the cap member 14 is disposed closer to the internal combustion engine 10, and the air cleaner case 13 is disposed on the side farther from the internal combustion engine 10 than the cap member 14. Therefore, the both 13 and 14 are arranged side by side in the horizontal direction, and the mating surface 16 extends in a substantially vertical direction.
[0015]
Each of the air cleaner case 13 and the cap member 14 is made of resin, and is a molded product of a resin material having a certain degree of elasticity such as nylon and excellent in strength. The components are also molded from the same resin as the air cleaner case 13 and the cap member 14.
The air cleaner element 15 has a specific shape omitted in the drawing, but has, for example, a corrugated filter portion, and the planar shape of the entire filter portion is a rectangle. The shape portion 15a protrudes outward. The filtration part and the bowl-like part 15a are integrally formed from the same filter medium (for example, a synthetic fiber nonwoven fabric, filter paper, etc.). The flange 15a of the air cleaner element 15 is sandwiched and fixed by the mating surface 16 between the air cleaner case 13 and the cap member 14.
[0016]
An air inlet 14a that projects horizontally upward from the internal combustion engine 10 is integrally formed on one side surface (side surface of the internal combustion engine 10) of the cap member 14, and the air inlet 14a is air in the vehicle engine room (outside air). ) Is introduced into the cap member 14.
Further, as shown in an enlarged view in FIG. 2, a plurality of locking projections 14 b are formed to protrude downward from an end of the cap member 14 on the side of the air cleaner case 13, whereas the air cleaner case 13 A protrusion 13a that protrudes downward from the bottom surface of the cap member 14 is formed at the bottom of the cap member 14, and a plurality of locking holes 13b into which a plurality of locking protrusions 14b are fitted are formed in the protrusion 13a. .
[0017]
Therefore, the bottom surface of the cap member 14 can be positioned and locked to the protruding portion 13a of the bottom of the air cleaner case 13 by fitting the locking protrusion 14b into the locking hole 13b. On the other hand, the end portion 14c (FIG. 1) of the upper surface portion of the cap member 14 is detachably coupled to the upper surface portion of the air cleaner case 13 by well-known coupling means (for example, a metal spring clip) (not shown).
[0018]
The introduced air from the air inlet 14a passes through the filtration part of the air cleaner element 15 in a substantially horizontal direction as indicated by an arrow a in FIG. To be cleaned. Accordingly, in FIG. 1, the left side of the air cleaner element 15 is a dust side space 17, and the right side of the air cleaner element 15 is a clean side space 18. A circular outlet hole 19 is formed at the outlet portion of the clean side space 18 formed in the air cleaner case 13. An upstream end of a throttle body 20 made of metal or resin is connected to the outlet hole 19.
[0019]
Here, the air cleaner case 13 and the throttle body 20 are connected by fastening means such as screws (not shown). A throttle valve 21 is disposed inside the throttle body 20 so as to be rotatable about a shaft 21a. As is well known, the throttle valve 21 is operated by an accelerator mechanism of a vehicle to adjust the amount of intake air taken into the internal combustion engine 10.
[0020]
An intake manifold 22 is disposed on the downstream side of the throttle body 20. The intake manifold 22 has a resin surge tank 23 that expands the volume of the downstream space of the throttle body 20 to relieve intake pulsation. Further, the number of cylinders of the internal combustion engine 10 from the surge tank 23 (for example, 3) and a resin intake manifold pipe 24 branched into three.
[0021]
The surge tank 23 is located on the upper side in a portion opposite to the internal combustion engine 10. As shown in FIG. 1, the intake manifold pipe 24 extends in a curved shape from the lower side of the surge tank 23 through the throttle body 20 and the air cleaner 12 toward the intake port 10 b of the internal combustion engine 10. Has been placed. A flange portion 25 forming an attachment portion is integrally formed with resin at the outlet portion (lower end portion) of the plurality of intake manifold pipes 24.
[0022]
The flange portion 25 has a flat plate shape along the mounting surface 10c of the internal combustion engine 10, and the flange portion 25 is fastened and fixed to the mounting surface 10c with screws (not shown). By tightening and fixing the flange portion 25, the entire intake device 11 can be fixed to the internal combustion engine 10.
In the intake device 11 disposed adjacent to the side of the internal combustion engine 10, intake system components such as an air cleaner case 13, a cap member 14, a throttle body 20, a surge tank 23, an intake manifold pipe 24, and a flange portion 25 are used. They are connected together and assembled as a unit assembly.
[0023]
On the other hand, a fuel injection valve 26 for injecting fuel (gasoline) is disposed on the flange portion 25 at the outlet side of the plurality of intake manifold pipes 24 (in other words, upstream of the intake port 10b of the internal combustion engine 10). Yes. That is, a mounting hole 27 for the fuel injection valve 26 is formed in the flange portion 25 corresponding to each of the plurality of intake manifold pipes 24, and the fuel injection valve 26 is inserted into the mounting hole 27 via the seal material 28. And is detachably held.
[0024]
The fuel injection valve 26 is disposed in a space between the lower side of the air cleaner 12 and the upper side of the intake manifold pipe 24 (that is, the external space of the air cleaner 12). The end portions (upper end portions) of the plurality of (for example, three) fuel injection valves 26 are integrally connected to a branch pipe portion 29a of one fuel supply pipe (distribution pipe) 29, respectively.
[0025]
Here, the fuel supply pipe 29 is arranged along the engine cylinder row direction in the vicinity of the fuel inlet side end (upper end) of each fuel injection valve 26 in the outer space below the air cleaner case 13. A support base 30 of the fuel supply pipe 29 is integrally formed on the upper surface portion of each intake manifold pipe 24. The upper surface of the support base 30 is formed substantially horizontally and provided with a semicircular recess 30a. Yes.
[0026]
Further, a pressing portion 31 of the fuel supply pipe 29 is formed on the bottom surface portion of the air cleaner case 13 so as to protrude downward, and an elastic pressing piece 31 a that can be elastically deformed is integrally formed with the pressing portion 31. . The elastic pressing piece 31 a is formed in a downward curved shape, and a spring force in the direction of arrow b is applied to the fuel supply pipe 29 to hold the fuel supply pipe 29 on the recess 30 a of the support base 30.
[0027]
Since the fuel pressure in the direction of arrow d acts on the fuel supply pipe 29 as a reaction force against the fuel injection direction c from the fuel injection valve 26, the holding force of the fuel supply pipe 29 opposite to the fuel pressure d is used as an elastic pressing piece. It is obtained with a spring force of 31a.
A mating surface (a sandwiching surface of the fuel supply pipe 29) 32 between the pressing portion 31 on the bottom surface portion of the air cleaner case 13 and the support base 30 on the upper surface portion of the intake manifold pipe 24 extends in a substantially horizontal direction. The mating surface 32 and the mating surface 16 of the air cleaner case 13 and the cap member 14 are orthogonal to each other.
[0028]
As is well known, the fuel injection valve 26 is an electromagnetic fuel injection means whose valve opening time is automatically controlled by an internal combustion engine electronic control unit. One end of the fuel supply pipe 29 is connected to a fuel supply pump via a fuel pipe (not shown), and fuel is pumped from the fuel supply pump to the fuel supply pipe 29.
Next, the operation of the above configuration will be described. When the internal combustion engine 10 is operated, outside air is sucked from the air inlet 14 a of the cap member 14 of the air cleaner 12, and the intake air flows into the dust-side space 17 in the cap member 14, and then the filtering portion of the air cleaner element 15. 1 as shown by the arrow a in FIG. Thereby, dust and the like in the air are removed by the air cleaner element 15 and the intake air is cleaned.
[0029]
Next, the purified intake air passes from the clean space 18 through the outlet hole 19 to the throttle body 20, and the flow rate is adjusted by the throttle valve 21. Next, the intake air passes through the surge tank 23 to absorb the pulsation, and then the intake air is distributed to the plurality of intake manifold pipes 24.
As understood from FIG. 1, the intake air flows in a substantially horizontal direction from the air inlet 14 a through the cap member 14, the air cleaner element 15, the air cleaner case 13, and the throttle body 20 to the surge tank 23, and then downwards. The direction is changed and flows into the intake manifold pipe 24, passes through the intake manifold pipe 24 downwardly in a curved shape, and flows into the intake port 10b. Accordingly, the intake air flows smoothly toward the intake port 10b without foreign matter, water, or the like staying in the intake path.
[0030]
On the other hand, the fuel is pumped by a fuel supply pump (not shown) and distributed to each fuel injection valve 26 through a fuel supply pipe 29. Then, each fuel injection valve 26 is timely opened by electronic control, so that fuel is injected into the outlet side portion of each intake manifold pipe 24. Therefore, the fuel and air are mixed and sucked into each cylinder from the intake port 10b of the internal combustion engine 10.
[0031]
By the way, the case 13 and the cap member 14 of the air cleaner 12 are arranged in a substantially horizontal direction, and the mating surfaces 16 of the both 13 and 14 are arranged to extend in the vertical direction, and the air cleaner element 15 is arranged in a substantially horizontal direction. Since they are arranged so as to pass through, the clean side space 18 is located laterally with respect to the dust side space 17. Therefore, when removing the cap member 14 from the case 13 and removing the air cleaner element 15 for maintenance of the air cleaner element 15, even if foreign matter such as dust in the dust side space 17 falls downward, the clean side space 18 does not enter.
[0032]
In addition, a mating surface 32 between the pressing portion 31 on the bottom surface of the air cleaner case 13 and the support base 30 on the top surface of the intake manifold pipe 24 is formed so as to extend in a substantially horizontal direction, and fuel is supplied by the mating surface 32. Since the pipe 29 is sandwiched and fixed, when assembling the fuel supply pipe 29, the fuel supply pipe 29 is placed on the support 30 on the upper surface portion of the intake manifold pipe 24, and the upper surface side of the fuel supply pipe 29 is placed. The fuel supply pipe 29 can be securely held and fixed by a simple means of pressing the fuel by the pressing portion 31 on the bottom surface of the air cleaner case 13.
[0033]
(Other embodiments)
In the above embodiment, the mating surfaces 16 and 32 are set in a substantially orthogonal relationship, but the mating surface 16 between the case 13 and the cap member 14 is clean at a slight angle (for example, about 30 °) from the vertical direction. It is also possible to arrange it by tilting toward the side space 18 side. With this slight inclination angle, foreign matter falling to the clean side space 18 side when the air cleaner element 15 is attached and detached can be suppressed to a level that hardly causes a problem in practice.
[0034]
It is also possible to arrange the mating surface 16 of the case 13 and the cap member 14 so as to be inclined toward the space 17 on the dust side. The inclined arrangement of the mating surface 16 on the dust-side space 17 side has no problem at all when the air cleaner element 15 is detached and attached to the clean-side space 18 side. However, since the inclined arrangement of the mating surface 16 toward the space 17 causes interference between the cap member 14 and the internal combustion engine 10 or the like, this inclined arrangement is also preferably limited to a predetermined angle, for example, 45 °.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of an essential part of an intake device for an internal combustion engine showing an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Intake device, 12 ... Air cleaner,
13 ... Air cleaner case, 14 ... Cap member,
15 ... Air cleaner element, 16, 32 ... Mating surface,
20 ... Throttle body, 22 ... Intake manifold, 23 ... Surge tank,
24 ... Intake manifold pipe, 25 ... Flange, 26 ... Fuel injection valve,
29 ... Fuel supply pipe.

Claims (3)

An air cleaner element (15) for filtering the intake air to the internal combustion engine (10) is housed in an air cleaner case (13) and a cap member (14) detachable from the air cleaner case (13),
A throttle body (20) containing a throttle valve (21) for adjusting the intake air amount to the internal combustion engine (10) is disposed on the air downstream side of the air cleaner case (13),
In an intake system for an internal combustion engine, an intake manifold (22) having an intake manifold pipe (24) extending toward an intake port (10b) of the internal combustion engine (10) is disposed on the air downstream side of the throttle body (20). ,
The air cleaner case (13) and the cap member (14) are arranged in a substantially horizontal direction, and the air cleaner element (15) is arranged so that the intake air passes in a substantially horizontal direction.
The intake manifold pipe (24) is disposed below the air cleaner case (13);
A fuel supply pipe (29) for supplying fuel to the fuel injection valve (26) of the internal combustion engine (10) is provided between the bottom surface of the air cleaner case (13) and the top surface of the intake manifold pipe (24). An intake device for an internal combustion engine, characterized by being sandwiched and fixed. A presser part (31) is formed on the bottom surface part of the air cleaner case (13), and a support base (30) is formed on the upper surface part of the intake manifold pipe (24),
The intake device for an internal combustion engine according to claim 1, wherein the fuel supply pipe (29) is sandwiched and fixed by a mating surface (32) between the pressing portion (31) and the support base (30). The mating surface (32) of the pressing part (31) and the support base (30) is arranged so as to extend in a substantially horizontal direction,
The mating surface (16) of the air cleaner case (13) and the cap member (14) is arranged so as to extend in a substantially vertical direction,
The intake system for an internal combustion engine according to claim 2, wherein the mating surfaces (16, 32) are arranged in a substantially orthogonal state.

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