JPH0735824U - Intake control device for multi-cylinder internal combustion engine - Google Patents

Abstract

(57) [Summary] [Structure] A valve body (II) forming an intake passage (10) communicating with each cylinder of a multi-cylinder internal combustion engine, and a rotary shaft (21a) arranged so as to penetrate through the valve body. In the intake control device for a multi-cylinder internal combustion engine, which includes a valve body (21b) supported by the rotating shaft and arranged in each of the intake passages so as to be capable of opening and closing the intake passage, both ends of the rotating shaft 21a are It is rotatably supported by the valve body, and the parts located between the valve bodies have elastic bodies (22) on the outer circumference, and the bearing surfaces (25a, 26a) of the valve body are in non-contact state. Has become. [Effect] It is possible to prevent tapping or damage due to vibration of the rotary shaft of the multiple butterfly valve, and reduce the rotary load.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake control device for a multi-cylinder internal combustion engine mounted on an automobile or the like, and more particularly to an intake control device for a multi-cylinder internal combustion engine characterized by a support structure for a multiple butterfly valve that opens and closes an intake passage.

[0002]

[Prior art]

 In order to take measures against exhaust gas and fuel consumption of an internal combustion engine, a butterfly type control valve is installed in the intake passage to open and close to adjust the intake air amount, or to adjust the intake pipe according to the engine speed, load, etc. A technique is known in which a switching valve for switching the length between two stages is provided in the intake passage to give an intake air inertia supercharging effect and resonance supercharging effect to improve the engine output.

Since such a control valve or switching valve is arranged in a region close to the cylinder of the engine, mechanical vibration of the engine, intake pulsation due to a piston sliding in the cylinder, or pressure wave due to backfire. Acts as it is on a butterfly type control valve, etc., and the impact causes the rotating shaft that supports the valve element to vibrate (because there is a gap in the bearing area) and collide with the bearing surface, producing a so-called rattling noise. There are cases.

Therefore, there is a technique of absorbing impact energy by using an elastic material for the bearing portion in order to prevent generation of rattling noise due to such vibration. (See Jpn. Pat. Appln. 1-17616). In this technique, as shown in FIG. 1, both ends of the rotary shaft 1a are directly supported by elastic members. More specifically, as shown in FIG. 1 (a), in the main body 2 of the intake control device made of an aluminum material or the like, a through hole 2b orthogonal to each intake passage 2a is formed by drilling or the like, and a valve is formed. A rotary shaft 1a made of steel or the like for supporting the body 1b is inserted and the valve body 1b is fixed to a portion of the rotary shaft located in each intake passage 2a by using a screw 1c or the like. Then, elastic bearings 3 each having a hollow portion 3a as shown in FIG. 1 (b) and an elastic core material covered with a synthetic resin material or the like are externally fitted to both ends of the rotating shaft 1a. At the very least, the multiple butterfly valve 1 is rotatably supported.

In such a rotating shaft supporting structure, when there is a gap between the inner wall surface of the through hole 2b supporting the intermediate portion of the rotating shaft 1a and the outer peripheral surface of the rotating shaft 1a, the rotating shaft 1a moves in the radial direction. However, since the both ends are supported by the elastic bearings 3 in close contact with each other, the vibration energy is absorbed by the elastic bearings 3 and the vibration of the rotating shaft 1a can be suppressed. On the other hand, since the elastic bearing 3 has a structure for directly supporting the rotary shaft 1a, the resistance at the time of rotating the rotary shaft increases, and therefore the drive source that supplements the energy according to the increase of the load. Is required.

Further, FIG. 1 (a) shows a case of a 4-cylinder internal combustion engine, but in the case of a larger cylinder, such as a 6-cylinder internal combustion engine, etc., the length of the rotating shaft becomes longer accordingly. It is also disadvantageous in terms of vibration and rigidity, and it may not be possible to suppress vibration with a structure in which both ends are simply supported by elastic bearings. On the other hand, as a guideline for today's automobile development, development of low fuel consumption vehicles by weight reduction of vehicles or development of low cost vehicles by changing materials and simplifying manufacturing process is being promoted.

Therefore, as for the above-mentioned intake 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 are simply made of resin and the conventional support structure for the rotating shaft is adopted, new mechanical strength, heat transfer performance, or deterioration of assembly accuracy due to deterioration of molding accuracy, etc. A new problem must be taken to prevent the vibration of the rotating shaft when a problem occurs.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the object of the present invention is to reduce the weight of the device and, in particular, to improve the operation of a multiple butterfly valve arranged in the intake passage. It is an object of the present invention to provide an intake control device for a multi-cylinder internal combustion engine that can prevent damage to the rotating shaft due to vibration without generating a tapping sound even if the moving shaft vibrates.

[0009]

[Means for Solving the Problems]

 An intake control device for a multi-cylinder internal combustion engine according to the present invention includes a shell that forms an intake passage that communicates with each cylinder of the multi-cylinder internal combustion engine, a rotating shaft that extends through the shell, and the rotating shaft. An intake control device for a multi-cylinder internal combustion engine, comprising: a valve body supported by a shaft and arranged in each of the intake passages so as to be openable and closable, wherein both ends of the rotary shaft are attached to the shell body. Rotatably supported with respect to each other, the portions located between the valve bodies have an elastic body on the outer periphery thereof, and the elastic body and the bearing surface of the shell are in non-contact state. It is characterized by being.

[0010]

[Action]

 According to the intake control device of the present invention, both ends of the rotary shaft are rotatably supported, and the space between the valve body located at the intermediate portion thereof has an elastic body on the outer periphery and the bearing surface. It is in a non-contact state. Therefore, even if the rotating shaft bends due to the influence of intake pulsation or vibration (so-called lateral vibration of the rod) occurs due to the gap in the bearing area, the elastic body contacts the bearing surface and further viscoelastic deformation occurs. As a result, energy is absorbed and there is no risk of hitting sound or damage to the rotating shaft due to collision.

Further, in the steady state, only both ends of the rotating shaft are in contact with the bearing surface, and the intermediate portion is in non-contact state (the elastic body and the bearing surface are in non-contact state). The load (resistance) at the time of turning does not increase, and the turning operation can be performed easily.

[0012]

【Example】

 An embodiment of the intake control device of the present invention will be described below with reference to the drawings. FIG. 2 is a plan view showing the appearance of the intake control device, which is composed of a combination of resin injection molded products forming three regions I, II, and III, as shown in the drawing. That is, the branch part (I) connected to the head intake port of the engine, the valve body part (II) as a shell that houses the multiple butterfly valves that are intake switching valves, the surge tank and the bypass intake passage. The cover portions (III) forming the above are respectively formed by injection molding or the like, and then, on the joining flange surface, each is integrally joined by vibration welding or the like.

FIG. 3 is a side view showing the appearance of the intake control device shown in FIG. 2 as viewed from the arrow R. As shown in the figure, a flange portion 10 for mounting a throttle body for adjusting the output of the engine and The bearings 20 that support one end of the rotary shaft of the multiple butterfly valves are arranged side by side. FIG. 4 is a side view showing the appearance of the intake control device shown in FIG. 2 as viewed in the direction of arrow L. As shown in the figure, the side face serves as a driving means for driving a multiple butterfly valve. An actuator 30 incorporating a gear mechanism is attached. FIG. 5 shows a multiple butterfly valve 21 that opens and closes the intake passage of a 6-cylinder internal combustion engine. FIG. 5 (a) is its plan view and FIG. 5 (b) is its side view. As shown in the figure, the rotary shaft 21a is integrally formed with six valve bodies 21b made of a resin material. Further, a flange portion 21c is formed on one end side of the rotating shaft 21a so as to contact the bearing surface in the thrust direction.

Further, in such a multiple butterfly valve, a resin material, for example, a rubber material or a rubber material containing a vulcanizing agent is vulcanized in a ring shape on the outer peripheral portion of the rotary shaft located between the valve bodies 21b. An elastic body 22 is provided. FIG. 6 shows a sectional view thereof. As the rubber, silicone rubber, urethane rubber, EBR, isoprene rubber, butyl rubber, acrylic rubber, styrene / isoprene copolymer rubber, polyester rubber, etc. can be used, and as the vulcanizing agent, sulfur, pentamethylene thiuram hexa Sulfide, 2,4,6-trimercapto-S-triazine and the like can be used. The rubber may be vulcanized by irradiation.

FIG. 7 is a cross-sectional view of the intake control device in the section BB in FIG. 2, in which the multiple butterfly valve 21 for opening and closing the intake passage 10 is automatically rotated. It is located in. As shown in the figure, in the multiple butterfly valve arranged in the valve body (II), one end of the rotary shaft 21a is rotatably supported by being urged radially by the bearing 20 and The end portion is rotatably supported by a bearing 23, and is connected to an actuator 30 for rotatively driving.

In this actuator 30, when a worm 32 is rotated by a drive source (not shown) such as a motor, a worm wheel 31 meshed with the worm 32 is rotated, and the worm wheel 31 is integrally fixed to the worm wheel 31. The rotating shaft 21a is adapted to rotate. The inner surface of the worm wheel 31 is urged toward the outside of the device by the coil spring 33, and the flange portion 21c integrally formed with the rotating shaft is formed on the inner wall of the valve body (II). The contact wall is brought into contact with the contact wall via the washer 24, and thus the movement of the rotary shaft in the thrust direction is restricted.

FIG. 8 is a partial cross-sectional view showing a portion D-D in FIG. 7, that is, a bearing region between the valve bodies 21 b, and as shown, the intake passage separating wall 26 of the valve body (II). The multiple butterfly valve shown in FIG. 7 is arranged in the bearing area formed on the base plate, and the bearing cap 25, which forms a part of the valve body as a shell, is fitted to melt the tip of the protrusion 26b, and the caulking state is obtained. The bearing cap 25 is fixed.

In this state, between the bearing surface 26a formed on the separation wall 26 and the bearing surface 25a formed on the bearing cap 25 and the outer peripheral surface of the elastic body 22 fixed to the outer periphery of the rotating shaft 21a. A gap 27 is secured between the two so that they are not in contact with each other. In this way, since it is in a non-contact state in a steady state, the rotating load on the bearing portion does not increase due to the provision of the elastic body, and it is easy to drive the multiple butterfly valve. You can do it.

Further, when the non-contact area is described in detail, as shown in the EE cross-sectional view of FIG. 9, the elastic body 22 is fixed to the groove portion 21d formed on the rotating shaft 21a, and on the one hand, The bearing surfaces 25a and 26a are formed so as to be located at the bottoms of the concave portions 25b and 26b, respectively. Therefore, the outer peripheral portion of the elastic body 22 is buried in the concave portions 25a and 26a in a state where the multiple butterfly valves are arranged at predetermined positions.

According to this, even if the fixed state of the elastic body 22 is released and the elastic body 22 is displaced in the axial direction of the rotary shaft 21a, the elastic body 22 does not fall off from the concave portions 25b and 26b. Without, it is possible to reliably absorb the impact energy due to vibration. In this way, even if the elastic body is in the loose insertion state, it is possible to surely achieve the desired function, so that the elastic body is not limited to the means for fixing the elastic body by vulcanization molding, but it is not limited to the means shown in FIGS. 10 (a) and 10 (b). A means for externally fitting a C-shaped elastic body 40 in which the surface of an elastic cored bar 40c having a notch 40a in a part of a ring shape as shown in Fig. 10 is covered with an elastic resin material 40b, or in Fig. 10 (c). A means for externally fitting a spiral elastic body in which the surface of an elastic cored bar having a spiral shape as shown in (4) is covered with an elastic resin material may be used.

That is, in the multiple butterfly valve in which the valve body and the rotary shaft are integrally formed as described above, the ring-shaped elastic body cannot be fitted on the intermediate shaft portion between the valve bodies (the valve body is If there is a notch in a part as shown in FIG. 10 (because it becomes an obstacle), it is possible to fit the rotation shaft in the radial direction. Further, even when the elastic body is externally fitted to the rotary shaft and is loosely inserted in the rotating shaft, the desired function can be surely exhibited because the disconnection preventing means in the axial direction is provided.

In the above-described embodiment, the multiple butterfly valves are integrally molded of resin material, and the pivotal support structure thereof is shown. However, the rotary shaft is formed of steel material as in the conventional case. Even if it has relatively high rigidity, as the number of cylinders increases and the length increases, the amount of bending due to the vibration of the rotating shaft also increases accordingly, so the shaft support structure of the present invention effectively exerts its effect. can do.

[0023]

【effect】

 As described above, according to the intake control device of the present invention, both ends of the rotary shaft of the multiple butterfly valve that opens and closes the intake passage are rotatably supported, and on the other hand, at the middle position thereof. There is an elastic body on the outer circumference between the valve bodies, which are not in contact with the bearing surface.

Therefore, even if the rotary shaft bends and vibrates due to the influence of intake pulsation, the elastic body comes into contact with the bearing surface and viscoelastically deforms to absorb the energy, and the impact sound due to the collision is generated. Damage to the rotating shaft due to generation or vibration is prevented. Also, in the steady state, only the both ends of the rotating shaft are in contact with the bearing surface, and the middle part is in the non-contact state, so the load when rotating is not increased (the elastic body (If the rotary shaft is rotated in a state of being in direct contact with the surface, the friction coefficient of the intermediate surface becomes large and the rotation resistance becomes large.) The rotation operation can be easily performed.

[Brief description of drawings]

1A and 1B show a shaft supporting structure of a multiple butterfly valve in a conventional intake control device, FIG. 1A is a cross-sectional view in the direction of its rotation axis, and FIG. 1B is a side view of an elastic bearing. Is.

FIG. 2 is an external plan view showing an embodiment of the intake control device according to the present invention.

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

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

FIG. 5 shows an integrally molded multiple butterfly valve applied to the intake control device of the present invention, FIG. 5 (a) is a plan view thereof, and FIG. 5 (b) is a side view thereof.

FIG. 6 is a cross-sectional view of a multiple butterfly valve taken along the line CC in FIG.

FIG. 7 is a cross-sectional view of the intake control device taken along the line BB in FIG.

FIG. 8 is a partial cross-sectional view of the intake control device taken along line DD in FIG.

FIG. 9 is a partial cross-sectional view of the intake control device taken along the line EE in FIG.

FIG. 10 shows another embodiment of the elastic body according to the present invention, FIG. 10 (a) is a perspective view of the C-shaped elastic body, and FIG.
10A is a cross-sectional view taken along the line FF in FIG. 10A, and FIG. 10C is a perspective view of the spiral elastic body.

[Explanation of symbols for main parts]

 10 intake passage 20 bearing 21 multiple butterfly valve 21a rotary shaft 21b valve body 21c flange portion 21d groove portion 22 elastic body 23 bearing 24 washer 25 bearing cap 25a bearing surface 25b concave portion 26 intake passage separating wall 26a bearing surface 26b concave portion 27 Gap 30 Actuator 31 Worm wheel 32 Worm 33 Coil spring 40 C-shaped elastic body 40a Notch 40b Elastic resin material 40c Elastic core metal 41 Spiral elastic body

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Toru Hashimoto 5-3-8 Shiba, Minato-ku, Tokyo Inside Mitsubishi Motors Corporation (72) Mitsuhiro Miyake 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Shigeyuki Ishiguro 2480 Kuno, Odawara, Kanagawa Mikuni Odawara Plant (72) Inventor Makichi Kato, Toho-cho, Yokkaichi, Mie Yokkaichi General Corporation In the laboratory

Claims (5)

[Scope of utility model registration request] 1. A shell body forming an intake passage communicating with each cylinder of a multi-cylinder internal combustion engine, a rotary shaft arranged so as to penetrate the shell body, and the intake passage supported by the rotary shaft. An intake control device for a multi-cylinder internal combustion engine, comprising: a valve element that is openably and closably arranged in each of the two. A multi-cylinder characterized in that a portion located between the valve bodies has an elastic body on an outer peripheral portion thereof, and the elastic body and a bearing surface of the shell body are not in contact with each other. Intake control device for internal combustion engine. 2. The intake control device for a multi-cylinder internal combustion engine according to claim 1, wherein the elastic body is fixed to the rotary shaft by vulcanization molding. 3. The elastic body has a ring shape, and the bearing surface of the shell body is formed in a concave shape so as to bury the outer peripheral portion of the elastic body. Intake control device for multi-cylinder internal combustion engine. 4. The multi-cylinder according to claim 1, wherein the elastic body is formed by covering the surface of an elastic cored bar having a notch in a part of a ring shape with an elastic resin material. Intake control device for internal combustion engine. 5. The intake control device for a multi-cylinder internal combustion engine according to claim 1, wherein the elastic body is formed by covering a surface of an elastic core metal having a spiral shape with an elastic resin material. .