JPH07166876A - Intake control device for multi-cylinder internal combustion engine - Google Patents

Abstract

(57) [Summary] [Structure] A valve body (II) that forms part of a long and short intake passage that communicates with each cylinder of a multi-cylinder internal combustion engine and a part of a surge tank, and a valve body (II) A cover that is abuttingly connected to the opening end and covers the opening end (II
I) and the inner wall surface of the cover so as to form a part of one of the two intake passages, and the surface 43a opposite to the surface facing the inner wall surface of the cover causes the surge tank 70 In the intake control device for a multi-cylinder internal combustion engine including a port shell 40 forming a part of the above, in the port shell 40, a passage wall forming the one intake passage 41 is integrally formed of a resin material for a plurality of cylinders. ing. [Effect] Since the cylinders are integrally formed for a plurality of cylinders, the intake passages for a plurality of cylinders can be formed by a single assembly work, and the work can be simplified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control device for a multi-cylinder internal combustion engine mounted on an automobile or the like, and is particularly characterized by a structure having two types of intake passages, long and short, and forming one of the intake passages. The present invention relates to an intake control device for a multi-cylinder internal combustion engine having a.

[0002]

2. Description of the Related Art Conventionally, the length of an intake pipe is switched between two stages according to the engine speed, load, etc., and the inertial supercharging effect or resonance supercharging effect is given to the intake air to improve the engine output. There is known an intake device for an engine that employs a so-called variable intake system. FIG. 1 is a cross-sectional view of an intake control device that employs such a variable intake system in a 6-cylinder internal combustion engine. In this drawing, a cross section of one intake passage corresponding to one cylinder of the engine is shown, but the intake passages are integrally formed in parallel in the direction perpendicular to the paper surface by an amount corresponding to six cylinders.

In such an intake control device, the surge tank 1 is provided from the side surface of the main body through a throttle valve (not shown).
The intake air introduced inside is a butterfly valve in the low and medium speed range, and the switching valve 2 is an actuator (not shown).
By being closed by the operation (state shown by the solid line), as shown by arrow A, via the bypass intake passage 3,
On the other hand, in the high speed range, the switching valve 2 is opened (the state shown by the chain double-dashed line) and is introduced directly into the engine cylinder as indicated by arrow B without passing through the bypass intake passage 3. ing.

That is, by opening / closing the switching valve 2, the pressure reversal wave due to the long intake pipe at low and medium speeds and the pressure reversal wave due to the short intake pipe at low speeds are synchronized, thereby improving the filling efficiency of the entire region. It is to improve both low and medium speed torque and maximum output. Further, in the intake control device adopting such a variable intake system, the main body portion forming the intake passage, the surge tank, etc. is cast using aluminum material, and the switching valve 2 and its rotating shaft 2a etc. are made of steel material. And the like.

Due to such restrictions on the casting technique, the intake control device has three regions, namely, the branch portion (I) forming only the intake passage and the switching valve 2 as a multiple butterfly valve, and the intake passage. And a cover body (III) that forms the surge tank 1 and a port shell 4 that forms a part of the bypass intake passage 3 and that is formed separately.
After that, using fastening means (not shown) such as bolts and nuts, the respective mounting flange surfaces are butted and integrally joined.

Now, the shape of the port shell 4 forming the bypass intake passage 3 (the longer intake passage) and its mounting structure will be described. FIG. 2 is a diagram showing a port shell 4 used in the conventional intake air control device shown in FIG. 1, FIG. 2 (a) is its external perspective configuration diagram, and FIG. 2 (b) is FIG. 2 (a). It is sectional drawing in the MM part in the inside. As shown in the figure, the port shell 4 corresponding to one bypass intake passage is integrally formed of a resin material with the pair of mounting flange portions 4b.

Then, the contact portion 4a of the port shell is abutted against the inner wall surface of the cover portion (III) formed of aluminum material (see FIG. 2 (b)), and the cover portion III is formed.
The caulking projection 5a located at the tip of the protruding portion 5 formed on the inner wall of the is inserted into the through hole 4c, and then the washer 6 is inserted.
To squeeze the protrusion 5a to make it caulked. After the installation of the port shell is completed, the cover portion (III) and the valve body portion (II) are fastened by fastening means such as bolts with the end surface 4d abutting against the end surface of the valve body portion (II). By fastening and fixing, the port shell is firmly fixed inside the device and forms the bypass intake passage 3.

As described above, since the conventional port shell has a shape that forms only one bypass intake passage, in the case of a multi-cylinder internal combustion engine, the number of ports corresponding to the number of cylinders is increased. It was necessary to attach each shell, and the assembling work was complicated. In the port shell, the surface 4e facing the cover portion (III) serves as an inner wall surface forming the bypass intake passage 3, and the surface 4f on the opposite side serves as an inner wall surface forming the surge tank 1. Therefore, in the case where the port shells need to be individually mounted as described above, the mounting space Q is required between the respective port shells, and when it is desired to suppress the capacity of the surge tank within a predetermined range from the viewpoint of improving the engine response in the low speed range. Had an unsuitable structure.

On the other hand, as one of the policies of today's automobile development, development of a fuel-efficient vehicle by weight reduction of the vehicle, or
Development of low-cost vehicles is being considered by changing the material and simplifying the manufacturing process. Therefore, with respect to the above-described intake air control device which has been conventionally formed of a metal material such as an aluminum material or a steel material, the use of resin as a component is being studied as a part thereof.

However, if the components of the conventional intake air control device are simply made of resin, the mechanical strength is lowered, the heat transfer is less effective, or the assembling precision is lowered due to the lowering of the molding precision of each component. A new problem occurs.

[0011]

In view of the above-mentioned problems of the prior art, it is an object of the present invention to reduce the weight of the device and to easily form two types of intake passages, a long type and a short type. An object of the present invention is to provide an intake control device for a multi-cylinder internal combustion engine, which can surely perform the original function with high accuracy and can also improve the response of the engine in a low speed range.

[0012]

An intake control device for a multi-cylinder internal combustion engine according to the present invention forms part of two types of long and short intake passages communicating with each cylinder of the multi-cylinder internal combustion engine and also forms a part of a surge tank. And a cover body that is abutted and coupled to the opening end of the shell to cover the opening end,
The surge tank is disposed in contact with the inner wall surface of the cover body to form a part of one of the two kinds of intake passages, and the surface opposite to the inner wall surface of the cover body is the surge tank. Is an intake control device for a multi-cylinder internal combustion engine including an intake passage forming member forming a part of the intake passage forming member, wherein the intake passage forming member has a passage wall forming one of the intake passages made of a resin material for a plurality of cylinders. It is characterized by being formed.

Further, the surface of the intake passage forming member forming the surge tank is formed substantially flat in the arrangement direction of the one intake passage.

[0014]

According to the intake control device of the present invention, since the intake passage forming member for forming one of the two types of long and short is integrally formed of the resin material for a plurality of cylinders, one intake passage is formed. The intake passages for a plurality of cylinders can be simultaneously formed simply by fixing the member to the cover body,
The assembling work is simplified.

Further, since the surface of the intake passage forming member on the side where the surge tank is formed is formed to be substantially flat in the arrangement direction of the intake passages, it occurs when each intake passage is formed individually as in the conventional case. The gap between the intake passages can be removed, and the capacity of the surge tank can be reduced accordingly, so that the response of the engine in the low speed range can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the intake control device of the present invention will be described below with reference to the drawings. FIG. 3 is a plan view showing the appearance of the intake control device. As shown in FIG.
It consists of a combination of resin injection molded parts forming two regions I, II and III. That is, a branch part (I) connected to a head intake port of an engine, a multiple butterfly valve as an intake switching valve, and a valve body part as a shell forming a part of two types of intake passages, long and short (II), the cover portion (III) as a cover body that covers the opening end of the valve body portion and forms the surge tank and the bypass intake passage (long intake passage) is formed by injection molding or the like, and then joined. The respective flange surfaces are integrally joined by vibration welding or the like.

FIG. 4 is a perspective view of the intake control system shown in FIG.
FIG. 3 is a side view showing the outer appearance of the engine. As shown in the drawing, a flange portion 10 (10a, 10b) for attaching a throttle body for adjusting the output of the engine is formed. FIG. 5 is a side view of the intake control device shown in FIG. 3 as seen from the direction of the arrow L. As shown in FIG.
An actuator 30 in which a gear mechanism for driving the multiple butterfly valves installed therein is installed is attached to the side surface.

Reference numeral 2 shown in FIGS. 3 and 4
Reference numeral 0 indicates the outer appearance of the end bearing that supports one end of the valve rotation shaft in the radial direction, and the rotation shaft of the multiple butterfly valve is arranged at this position. FIG. 6 is a sectional view taken along the line CC in FIG. As shown in this figure, inside the valve body (II),
A multi-integrated butterfly valve in which the butterfly valve 21 and the rotary shaft 21a are integrally molded of a resin material is rotatably supported by an intermediate bearing 22 and is arranged in the intake passage. Also, inside the cover part (III),
A port shell 40 as an intake passage forming member for forming a bypass intake passage is arranged in contact with and fixed to the inner wall of the cover portion (III).

The structure of the port shell 40 will be described below with reference to FIGS. 7 to 13. FIG. 7 is a view of the valve body (II) seen from the end surface side of the cover (III) mounting side, and as shown in the drawing, a part of a short intake passage is formed inside the valve body (II). A passage 51 and a passage 52 forming a part of a long intake passage (a bypass intake passage) are formed. And passage 51
Four convex portions 53 projecting inward from the outer wall of the valve body are formed above, and end surfaces 55 and 54 are formed near the passage 52. The part indicated by the reference numeral 56 is a part which becomes a wall surface forming a part of the surge tank.

FIG. 8 is a sectional view of the valve body taken along the line D--D in FIG. 7, and as shown in the drawing, the cover (II
I) A concave flange portion 50 is formed on the end surface (opening end portion) on the mounting side so as to abut and bury a part of the cover (III) when vibration welding the cover (III).
The end surface 53a and the end surfaces 55, 54 are formed at a position slightly retracted from the end of the valve body.

FIG. 9 is a view of the cover (III) seen from the end surface side of the valve body mounting side. As shown in the drawing, inside the cover (III), a part of a passage wall forming a bypass intake passage is formed. Six outer passage walls 61 are formed so as to project outward in a substantially semicircular cross section. Further, between the outer passage walls 61, a total of four protrusions 63 for thermally crimping a port shell described later, except for the central portion, are formed. Grooves 62 extending in the vertical direction are formed on both sides of each outer passage wall 61, and fitting ribs 44 of a port shell, which will be described later, are fitted and fitted into the grooves 62. Further, on the outer periphery of the outer passage wall 61, there is formed a contact surface 64 for contacting and closely contacting the contact portion 48 of the port shell, which will be described later (the portion indicated by the dot mark).

FIG. 10 is a sectional view of the cover (III) shown in FIG. 9. FIG. 10 (a) is a sectional view taken along the line EE, and FIG. 10 (b) is a sectional view taken along the line FF. It is a figure. As shown in the drawing, a convex flange portion 60 that is fitted into the concave flange portion 50 of the valve body is formed on the entire end surface of the valve body (II) attachment side except the opening 10c.

11 and 12 show a port shell 40 in which the portions corresponding to the three bypass intake passages are integrally formed of a resin material. FIG. 11 shows the port shell viewed from the surge tank side. A front view (FIG. 11 (a), a plan view (FIG. 11 (b)) and a cross-sectional view (FIG. 11 (c)) taken along the line GG are shown respectively, and FIG. 12 is viewed from the cover (III) side. Rear view of the open port shell (Fig. 12 (a), H-H)
A cross-sectional view of the portion (FIG. 12B) and a side view taken along the arrow S (FIG. 12C) are respectively shown. As shown in both figures, the integrally formed port shell 40 has an inlet flange portion 4 which forms an inlet portion of a bypass intake passage in an upper portion thereof.
2, a passage wall 43 is formed to form a passage 41 downward from the flange portion so as to form a half ring shape in cross section.
And a fitting rib 44 which is fitted and fitted in the groove 62 of the cover (III). Further, a through hole 45 into which the protrusion 63 is fitted when the caulking is fixed to the cover (III) is provided between the passage walls 43 and approximately at the central portion in the vertical direction.

Further, on the surface 43b opposite to the surface 43a facing the inner wall surface of the cover (III), that is, on the upper and lower end surfaces of the port shell facing the surge tank side, the port shell has a cover (III) and a valve body. A biasing protrusion that contacts the end faces 54, 53a of the valve body (II) and biases the port shell toward the cover (III) in a state where the port shell is disposed between the valve shell and the (II) and is fixedly connected. 46 and 47 are formed. Due to the biasing projections 46 and 47, the port shell 40 is constantly pressed against the inner wall surface of the cover (III) so that the bypass intake passages are separated from each other without being communicated with each other. Will be.

As shown in the sectional view of FIG. 11 (c), the surface 43b of the port shell 40 on which the surge tank is formed is formed to be substantially flat in the arrangement direction of the intake passages 41. There is. Thereby, each passage wall 43
The capacity of the surge tank can be reduced by the capacity of the air gap V sandwiched between the two, and the shape is more effective in terms of engine response in the low speed range.

The procedure for attaching and fixing the above-mentioned port shell 40 will be described below. First, a fitting rib 44 formed at the end of the port shell passage wall 43.
So as to fit into the groove 62 formed on the inner surface of the cover (III) and so that the contact portion 48 contacts the cover (III) 64.
Insert the protrusion 63 of I). Then, the tip portion of the protrusion 63 protruding from the through hole 45 is deformed by applying heat, and the caulked state is obtained. Then, the cover (III) to which the port shell 40 is caulked and fixed is connected so that the convex flange 60 thereof is fitted into the concave flange portion 50 of the valve body (III). At this time, the port shell 40
End face 49 of the valve body (II) faces the end face 55 of the valve body (II). Then, vibration welding is performed in the contact region between the convex flange portion 60 and the concave flange portion 50 to firmly fix the two.

Due to such vibration welding, the valve body (I
FIG. 13 shows a state in which I) and the cover (III) are fixed. This figure is a partial cross-sectional view of the device in a fixed state,
As shown, in this state, the port shell 40
The urging protrusions 4 provided at the ends in the vertical direction of the
6, 47 are end faces 54 formed on the valve body (II),
53a is in contact with each other. This allows
The port shell 40 is strongly pressed toward the inner wall surface of the cover (III), so that the port shell and the inner wall of the cover come into close contact with each other more reliably.

The cover of the port shell 40 (III)
The surface 43b opposite to the surface facing the inner wall surface of the valve 43 and the inner wall surface 55 of the valve body (II) form a surge tank 70 for temporarily storing the sucked air.
In the above embodiment, the case where the valve body (II), the cover (III), the port shell 40, etc. are all made of a resin material has been described, but the present invention is not limited to this and is made of another metal material. Even in such a case, the operation and effect of the present invention can be naturally obtained.

[0029]

As described above, according to the intake control device of the present invention, the intake passage forming member (port shell) forming one of the two kinds of intake passages is made of the resin material for a plurality of cylinders. Since it is integrally formed, the work for fixing the intake passage forming member to the cover body can be simplified. Further, as compared with the conventional case where the components are individually assembled, the number of fixing parts can be reduced and the weight of the device can be reduced.

Further, since the surface of the intake passage forming member on the side where the surge tank is formed is formed so as to be substantially flat in the arrangement direction of the intake passages, it occurs when they are individually assembled as in the conventional case. Voids between the intake passages can be removed, and accordingly, the capacity of the surge tank can be reduced accordingly, and the response of the engine in the low speed range can be improved.

[Brief description of drawings]

FIG. 1 shows a cross-sectional view of a conventional intake control device.

2A and 2B are diagrams showing a shape and a mounting structure of a port shell in a conventional intake air control device, FIG. 2A is a perspective view thereof, and FIG. 2B is a MM portion in FIG. 2A. FIG.

FIG. 3 is an external plan view of an intake air control device according to the present invention.

FIG. 4 is an external side view of the intake control device taken along the arrow R in FIG.

5 is an external side view of the intake control device taken along the arrow L in FIG.

FIG. 6 is a cross-sectional view of the intake control device at CC section in FIG.

FIG. 7 is a view of the valve body forming the intake control device as seen from the end surface direction on the cover attachment side.

8 is a cross-sectional view of the valve body taken along the line DD in FIG.

FIG. 9 is a view of a cover forming the intake control device as seen from the end surface direction on the valve body mounting side.

10 is a cross-sectional view of the cover shown in FIG. 9, FIG. 10 (a) is a cross-sectional view taken along the line EE, FIG.
(B) is sectional drawing in the FF section.

11A and 11B show a port shell incorporated in the intake control device according to the present invention, FIG. 11A is a front view thereof, FIG. 11B is a plan view thereof, and FIG. 11
It is sectional drawing in the GG part in (a).

FIG. 12 is a view showing a port shell incorporated in the intake control device according to the present invention, FIG. 12 (a) is a rear view thereof, and FIG. 12 (b) is an HH part in FIG. 12 (a). 12C is a cross-sectional view of FIG. 12C, and FIG.

FIG. 13 is a partial cross-sectional view of an intake control device having a port shell installed therein.

[Explanation of symbols for main parts]

 40 Port Shell (Intake Passage Forming Member) 41 Detour Intake Passage (One Intake Passage) 43 Passage Wall 43a Surface Facing Inner Wall Surface of Cover 43b Surface Opposite Face Facing Inner Wall Surface of Cover 55 Inner Wall Surface of Valve Body 70 Surge tank

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F02M 35/10 102 Y (72) Inventor Akira Takahashi 5-3-8, Shiba, Minato-ku, Tokyo Mitsubishi Automobile Industry Co., Ltd. (72) Inventor Toru Hashimoto 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automobile Industry Co., Ltd. (72) Inventor Mitsuhiro Miyake 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Automotive Industry Co., Ltd. (72) Inventor Shigeyuki Ishiguro 2480 Kuno, Odawara-shi, Kanagawa Mikuni Odawara Plant (72) Inventor Shigeo Tsukagoshi 2-14-14 Shin-Yokohama, Kohoku Ward, Yokohama, Kanagawa Prefecture In-house (72) Inventor Miya Kazu, 14-14 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa 10 Tokyo Roki Co., Ltd. (72) Inventor Naoto Nishimoto Shin, Kohoku-ku, Yokohama-shi, Kanagawa Hama 2-chome 14 address 10 Tokyo Roki within Co., Ltd.

Claims (2)

[Claims] 1. A shell body that forms a part of two types of long and short intake passages communicating with each cylinder of a multi-cylinder internal combustion engine and a part of a surge tank, and abuts on an open end of the shell body. A cover body that is coupled to cover the opening end, and is disposed in contact with an inner wall surface of the cover body to form a part of one of the two kinds of intake passages, and the inner wall surface of the cover body. An intake control device for a multi-cylinder internal combustion engine that includes an intake passage forming member that forms a part of the surge tank with a surface opposite to the intake passage forming member, wherein the intake passage forming member is the one intake passage forming member. An intake control device for a multi-cylinder internal combustion engine, characterized in that the passage walls forming the above are integrally formed of resin material for a plurality of cylinders. 2. The multi-cylinder according to claim 1, wherein the intake passage forming member has a surface on the side where the surge tank is formed is substantially flat in the arrangement direction of the one intake passage. Intake control device for internal combustion engine.