JP3428762B2 - Intake device for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an internal combustion engine, and more particularly to a structure of an intake system suitable for use in a vehicle for compactness and cost reduction.

[0002]

2. Description of the Related Art In a conventional intake system, a throttle and an air flow meter or an air cleaner are connected by a duct, and the air cleaner is mounted on the vehicle body side. The air cleaner is attached to an inlet portion of an intake pipe line connected to the internal combustion engine, and an air cleaner body is provided with an inlet pipe for introducing outside air and an outlet pipe connected to the intake pipe line.

Japanese Unexamined Patent Publication No. 6-81735 discloses an intake system in which an air cleaner, an air flow meter, and a throttle valve surge tank are adjacent to each other, and a duct connecting the parts is eliminated, and an intake system component is integrated on the internal combustion engine side. It is disclosed. Further, European Patent Publication No. 0523027A2 discloses an intake device in which an injector is housed in an air cleaner.

[0004]

However, according to the conventional intake system, an internal combustion engine (hereinafter,
Since a large space is required to arrange the intake pipe section up to the "engine", a lot of man-hours are required to design the arrangement of each section in the engine room. In addition, it is necessary to design the layout in the engine room according to the space in the engine room that changes for each vehicle type,
It is difficult to standardize parts.

Further, according to the intake device described in Japanese Patent Laid-Open No. 6-81735, since the duct from the air cleaner to the surge tank is omitted, the inertia effect is lost and the low speed torque is deteriorated. It has been found that when performing engine torque tuning, the torque at medium and low speeds can be adjusted by changing the length of the upstream intake passage, that is, the intake passage from the air cleaner to the surge tank. Therefore, it is effective to extend the upstream intake passage to increase the torque at low speed. However, it is difficult to extend the upstream intake passage without changing the position of the air cleaner due to the layout restriction in the engine room. Therefore, according to the intake device having the structure in which the outlet pipe projects from the air cleaner body as in the conventional case, it is very difficult to extend the upstream intake passage because it is necessary to redesign the layout in the engine room. There is a problem.

An object of the present invention is to provide an intake system for an internal combustion engine in which the upstream intake passage can be extended by a predetermined length without changing the position of the air cleaner.
Another object of the present invention is to provide an intake system for an internal combustion engine, which secures an intake passage length, saves space in an engine room, and standardizes the intake system.

[0007]

In order to solve the above problems, an intake system for an internal combustion engine according to claim 1 of the present invention comprises:
An air intake device for an internal combustion engine, which filters air by an element of an air cleaner and supplies the air to each cylinder of an engine, wherein a duct that has an intake passage and is connected to an air inlet side of a throttle is provided in a case of the air cleaner. Prepare , in front
By attaching the duct cover to the inner wall of the case
And it features that you form a serial duct.

An intake system for an internal combustion engine according to claim 2 of the present invention is the intake system for an internal combustion engine according to claim 1, wherein the case is adjacent to the throttle.

[0009]

According to the intake system for the internal combustion engine of the first aspect of the present invention, the duct provided in the case of the air cleaner and connected to the throttle functions as the outlet pipe of the conventional air cleaner. Therefore, by changing the length of the duct formed in the case,
It is possible to effectively use the inertial intake air in the air cleaner portion by adjusting the substantial length of the upstream intake passage, which is one of the factors that improve the torque at low speeds. Since the length of the duct can be changed without changing the installation position of the air cleaner, parts other than the duct forming part can be shared among the vehicle types, and the intake system can be standardized. Also, use the duct cover on the inner wall of the air cleaner case.
Since the duct is formed by attaching the bar,
A part of the wall surface of the case is formed by the inner wall of the case. this
This reduces the weight of the duct cover and reduces the duct cover.
The bar can be easily fixed to the inner wall of the case. Well
Also, by installing the duct cover on the inner wall of the case
The rigidity of the case is improved, and the penetration generated from the wall surface of the case
The sound can be reduced.

According to the intake device of the second aspect of the present invention, since the case of the air cleaner is adjacent to the throttle, the intake device can be made compact while maintaining the required intake passage length.

[0011]

The present invention will be described in detail below with reference to the drawings. (First Embodiment) A first embodiment of the present invention is shown in FIGS. As shown in FIGS. 1 and 2, the air cleaner 10 is provided adjacent to a head cover 92 of an engine 90 having an opening 91 for mounting an ignition coil 93.
On the side opposite to the engine side of the air cleaner 10, the throttle valve 5
A throttle 50 having two and a throttle bore 51 is provided. The air cleaner 10 and the surge tank 80 are connected via the throttle bore 51, and a plurality of intake manifolds 85 are connected to the intake port 86 of the engine 90 via the surge tank 80 and below the air cleaner 10.

The case 30 of the air cleaner 10 comprises a dusty side case 11 made of resin and an air cleaner cap 21 made of resin, and corresponds to at least the row of the intake manifold 85 along the cylinder row of the engine 90 or more. It extends with a width. Between the dusty side case 11 and the air cleaner cap 21, a case 3
An element 16 for partitioning the space within 0 into a dusty side and a clean side is arranged. As shown in FIG. 2, the dusty side is located below the element 16. The air inlet 1 is provided on the first wall surface 11a of the dusty side case 11 which is perpendicular to the cylinder row of the engine.
Two are provided.

Further, as shown in FIG. 2, the case 30 is adjacent to the throttle 50. Dusty side case 1
A delivery pipe 13, which is a fuel supply system to the engine 90, and a plurality of injectors 14 corresponding to the cylinders are housed in the engine 1. Each injector 14 is inserted into each branch pipe of the intake manifold 85 that extends through the bottom wall of the dusty side case 11 and extends to the lower side of the dusty side case 11. It is fixed together with the intake manifold 85, the dusty side case 11, and the delivery pipe 13 from the inside of 11. Also, the first
Second of the dusty side case 11 parallel to the wall surface 11a of the
An engine control unit (hereinafter referred to as "ECU") 40 is attached to the wall surface 11b of the.

The fuel supplied into the delivery pipe 13 from a fuel supply pump (not shown) is supplied to a plurality of injectors 14.
And is injected from the tip of each injector 14 into the vicinity of an intake port 86 of an engine 90 connected to each intake manifold 85 provided below the dusty side case 11. The injection amount and injection timing of fuel are controlled by the ECU 40.

The head cover 92, the dusty side case 11, the throttle bore 51 and the surge tank 80 are
It is integrally molded with resin. As shown in FIG. 2, the engine side wall surface 31 of the dusty side case 11 is shared with the air cleaner side wall surface of the head cover 92. An opening is formed at the upper end of the dusty side case 11,
Around the opening, a mounting hole (not shown) for mounting the air cleaner cap 21 is provided. A throttle bore 51 is formed following the anti-engine side wall surface of the dusty side case 11, and an end portion of the throttle bore 51 on the air cleaner side is opened above the dusty side case 11. A surge tank 80 is formed following the outer circumference of the throttle bore 51, and the end of the throttle bore 51 on the side opposite to the air cleaner projects into the surge tank 80.

A duct cover 20 made of resin extends in the air cleaner cap 21 of the air cleaner 10.
The duct cover 20 has a half-section 20a having a semicircular cross section.
And a cylindrical portion 20b, which is provided at the throttle side end portion of the duct cover 20 and is connected to the throttle bore 51, having a circular cross section, following the half split portion 20a. Duct cover 2
The opening 20c on the air intake side of 0 is formed in a bell mouth shape in order to reduce the air resistance of the intake air. The duct cover 2 is provided on the upper inner wall surface of the air cleaner cap 21.
When 0 is mounted, a tubular duct is formed by the half-divided portion 20a of the duct cover 20 and the upper inner wall surface of the air cleaner cap 21. A seal gasket is provided on the inner circumference of the throttle side end of the cylindrical portion 20b, and the throttle side end of the cylindrical portion 20b is connected to the inlet of the throttle bore 51 via this seal gasket.

The duct cover 20 will be described in more detail. As shown in FIGS. 4 and 5, a flange 20d that is continuously formed and a plurality of locking portions 20e that are formed at regular intervals are provided at both end portions of the half-split portion 20a. A locking member 21 a is provided on the upper inner wall surface of the cap 21.

The air cleaner cap 21 is formed by fitting the engagement portion 20e to the engagement member 21a and welding the flange 20d to the upper inner wall surface of the air cleaner cap 21.
When the duct cover 20 is attached to the inner wall surface of the upper side of the duct cover 20,
A tubular duct is formed by the upper inner wall surface of a. As a result, as shown in FIG. 1, the duct having the length L ₁ from the opening 20c to the cylindrical portion 20b becomes an air cleaner 1.
It is formed on the clean side within 0. That is, the duct from the conventional air cleaner corresponding to the upstream side portion of the intake passage to the surge tank has a length L ₁ within the air cleaner 10.
It was only housed. A seal gasket is provided on the inner circumference of the throttle side end of the cylindrical portion 20b, and the throttle side end of the cylindrical portion 20b is connected to the inlet of the throttle bore 51 via this seal gasket.

When the intake device is assembled, the ECU 40 is attached to the dusty side case 11 so that the dusty side case 11
Install the fuel supply system inside. A resin or metal intake manifold 85 is connected to the lower end of the surge tank 80 by a method such as welding or fixing with a bolt.
After arranging the element 16 in the opening of the dusty side case 11, a claw portion (not shown) formed at the lower end of the air cleaner cap 21 is inserted into a mounting hole (not shown) provided at the upper end of the dusty side case 11, and both are clipped. The air cleaner cap 21 is detachably attached to the dusty side case 11 by fixing. At this time, the throttle side end of the cylindrical portion 20b is simultaneously connected to the inlet of the throttle bore 51.

In this way, the head cover 92, the air cleaner 10, the throttle 50, the surge tank 80 and the intake manifold 85 are unitized and assembled,
It is attached to the engine body as a unit. Next, the operation of this intake device will be described. Air inlet 1
The air sucked from 2 to the dusty side is filtered by the element 16 to remove dust in the air and flows into the clean side. Clean side air is duct cover 2
It is sent to the surge tank 80 from the opening 20c which is the inlet of 0 through the duct cover 20 and the throttle 50. The air in the surge tank 80 is supplied to each intake manifold 8
5 is supplied to each cylinder of the engine 90 from the intake port 86 through the lower portion of the dusty side case 11. The intake amount of air from the air inlet 12 is controlled by the opening degree of the throttle valve 52.

According to the first embodiment of the present invention, since the ECU 40 and the fuel supply system are arranged on the dusty side of the air cleaner 10, it is possible to save space in the engine room. Further, since the ECU 40 and the fuel supply system can be cooled by the air flowing through the air cleaner 10, overheating of the ECU 40 and the fuel supply system due to the heat from the engine 90 can be reduced. As a result, the vapor lock phenomenon is prevented in the fuel supply system, and the ECU 40 is protected from the heat of the engine 90.

By storing the injector 14 in the dusty side case 11 of the air cleaner 10, the space in the dusty side case 11 can be used as a space for maintenance and inspection work of the injector 14, so that the space in the engine room is saved. It can be effectively utilized. The maintenance and inspection work of the injector 14 is performed by the air cleaner cap 21 and the element 16 of the air cleaner 10.
By removing the element 16, the element 16 has a size over the entire area of the upper side opening of the dusty side case 11, so that the element 16 can be easily performed, so that serviceability is improved. Since the air cleaner cap 21 is attached to the dusty side case 11 by inserting the claw portion of the air cleaner cap 21 into the attachment hole of the dusty side case 11, the air cleaner cap 21 can be easily removed.

Further, since the dusty side of the air cleaner 10 is located below the element 16, even if water enters the air cleaner 10 through the intake passage or the hole for mounting the component, this water will be in the dusty side case 11. Since it accumulates, it can be prevented from entering the engine 10. The duct cover 20 extending into the air cleaner cap 21 and the upper wall surface of the air cleaner cap 21 form an intake passage in the air cleaner 10, which corresponds to the intake passage formed in the duct from the conventional air cleaner to the surge tank. It is possible to secure the length of the intake passage from 10 to the surge tank 80, maintain the low speed torque, and save the space of the intake device.

That is, a duct is formed in the air cleaner 10 by the duct cover 20 and the air cleaner cap 21, whereby the duct from the conventional air cleaner, which is the upstream side intake passage, to the surge tank is inside the air cleaner 10 by the length L _1. Will be housed in. Therefore, the intake passage can be secured from the air cleaner 10 to the surge tank 80, the low speed torque can be maintained, and the space of the intake device can be saved. Further, by changing the length of the duct cover 20 extending into the air cleaner cap 21, the substantial length of the upstream intake passage can be changed to adjust the low speed torque without changing the installation position of the air cleaner 10. . As a result, it is possible to achieve commonality among vehicle types except for the parts around the duct. Further, since the duct is formed by attaching the duct cover 20 to the upper inner wall of the air cleaner cap 21, a part of the wall surface of the duct is formed by the inner wall of the air cleaner cap 21, so that the weight of the duct cover is reduced and the duct cover is reduced. The 20 can be easily fixed to the upper inner wall of the air cleaner cap 21. By welding the duct cover 20 to the upper inner wall of the air cleaner cap 21, the surface rigidity of the air cleaner cap 21 is improved, and the transmitted sound generated from the upper surface of the air cleaner 10 can be reduced.

Further, since the head cover 92, the dusty side case 11, the throttle bore 51 and the surge tank 80 are integrally molded of resin, the number of parts and the number of assembling steps can be reduced. The head cover 92, the air cleaner 10, the throttle 50, the surge tank 80, and the intake manifold 85 are unitized into the engine 9
Since it is attached to No. 0, the layout design of the intake device in the engine room is facilitated and the intake device can be standardized. Since the intake device is unitized and attached to the engine 90 as described above, the engine performance can be checked by an actual product in the engine factory, and the number of assembling steps can be reduced. Since the intake device is unitized, the performance of the entire intake device can be checked by the actual product, and the performance of the entire intake device can be managed at the time of this performance check. Further, since the intake manifold 85 is connected to the intake port 86 from the surge tank 80 through the lower portion of the dusty side case 11, it is possible to save the space of the intake device while ensuring the length of the conventional intake manifold.

Further, since the fuel supply system and the ECU 40 are housed compactly in the dusty side case 11, the harness can be simplified. Further, since the air cleaner 10 is located between the head cover 92 and the surge tank 80, the ECU 40 is arranged substantially in the center of the engine room, which has the effect of reducing the length of the harness as the entire engine component. .

(Second Embodiment) A second embodiment of the present invention is shown in FIG.
Shown in. The second embodiment is an example in which the duct formed in the air cleaner is shorter than that of the first embodiment. Figure 5
As shown in, the duct cover 120 extends into the air cleaner cap 21 of the air cleaner 10. The duct cover 120 includes a half-divided portion 120a having a semicircular cross-section, and a circular-cylindrical portion 120b provided on the throttle-side end of the duct cover 120 and connected to the throttle bore 51, following the half-divided portion 120a. Consists of. Duct cover 1
The opening 120c on the air intake side of 20 is formed in a bell mouth shape in order to reduce the air resistance of the intake air. By mounting the duct cover 120 on the upper inner wall surface of the air cleaner cap 21, a duct having a length L ₂ from the opening 120c to the cylindrical portion 120b is formed in the clean side air cleaner 10. That is, the duct from the conventional air cleaner corresponding to the upstream side portion of the intake passage to the surge tank is accommodated in the air cleaner 10 by the length L ₂ . The configuration of the other parts is substantially the same as that of the first embodiment.

According to the second embodiment of the present invention, it is possible to save the space of the intake device while securing the intake passage length from the air cleaner 10 to the surge tank 80 as in the first embodiment. (Third Embodiment) A third embodiment of the present invention is shown in FIG. Third
The embodiment is an example in which a resonator is attached to the duct cover in the configuration of the first embodiment.

As shown in FIG. 6, the duct cover 20 is mounted in the air cleaner cap 21 of the air cleaner 10. A resonator 239 for changing the resonance frequency of the duct is attached to the duct cover 20.
The configuration of the other parts is substantially the same as that of the first embodiment. According to the third embodiment of the present invention, in addition to the same effects as those of the first and second embodiments, since the resonator conventionally attached to the air cleaner hose can be installed in the air cleaner 10, the space of the intake device can be saved. Further, since the resonator 239 is installed on the clean side of the air cleaner 10, it is sufficient to have a simple sealing property comparable to the resonator mounted on the dusty side.

Although the cylinders of the engine are arranged in series in each of the above-described embodiments, the intake device for the internal combustion engine of the present invention can be applied to a V-type engine. Further, the head cover 92, the dusty side case 11, the surge tank 80, and the throttle bore 51 may not be integrated, but two or three parts may be integrated and the rest may be connected separately by bolts or the like. Of course, only the throttle bore 51 may be made of aluminum die cast.

Further, in each of the above-described embodiments, the duct cover 20 consisting of the halved portion and the cylindrical portion is provided inside the air cleaner cap 21, and the inner wall of the air cleaner cap 21 is used as the duct wall surface.
A tubular duct may be provided instead of the duct cover 20. Further, a duct may be integrally provided on the upper surface of the air cleaner cap and connected to the throttle bore.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of FIG.

FIG. 3 is a plan view showing a duct cover mounting structure according to a first embodiment of the present invention.

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

FIG. 5 is a plan view showing a second embodiment of the present invention.

FIG. 6 is a plan view showing a third embodiment of the present invention.

[Explanation of symbols]

10 air cleaner 11 Dusty side case (case) 12 Air inlet 13 Delivery pipe 14 injectors 16 elements 20 Duct cover 21 Air cleaner cap (case) 40 ECU 50 throttle 51 Throttle bore 52 Throttle valve 80 surge tank 85 intake manifold 86 intake port 90 engine 92 head cover 120 duct cover 239 Resonator

Continuation of the front page (56) Bibliography Flat 4-52556 (JP, U) Real development Sho 63-143724 (JP, U) Real development Sho 54-29225 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) F02M 35/024 F02M 35/04 F02M 35/10

Claims (2)

(57) [Claims] 1. An air intake device for an internal combustion engine, wherein air is filtered by an element of an air cleaner and the air is supplied to each cylinder of the internal combustion engine, wherein an air intake passage is provided in a case of the air cleaner. The case is equipped with a duct connected to the side
By installing a duct cover on the inner wall of the duct
An intake system for an internal combustion engine, characterized that you form. An intake system for an internal combustion engine, comprising: 2. The intake system for an internal combustion engine according to claim 1, wherein the case is adjacent to the throttle.