JP2824447B2 - Multiple-integrated butterfly valve for intake control device of multi-cylinder internal combustion engine and apparatus for manufacturing the same - 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 control system for a multi-cylinder internal combustion engine mounted on an automobile or the like, and more particularly, to a multiple integrated butterfly valve which is arranged in the system and opens and closes an intake passage, and a valve therefor. It relates to a manufacturing device.

[0002]

2. Description of the Related Art Conventionally, the length of an intake pipe and the like are switched in two stages according to the rotational speed and load of an engine to impart an inertial supercharging effect or a resonance supercharging effect to intake air to improve the output of the engine. A so-called variable intake system is employed in an intake device of an engine. FIG. 1 is a cross-sectional view of an intake control device employing such a variable intake system in a six-cylinder engine. In this figure, the engine 1
Although the cross section of one intake passage corresponding to the cylinder is shown, the intake passages are formed integrally in parallel in a direction perpendicular to the paper of FIG.

In such an intake control device, a surge tank 1 is provided from a side surface of a main body via a throttle valve (not shown).
The intake air introduced into the internal combustion engine is closed in a low and medium speed range by the operation of an actuator (not shown) of the valve body 2a of the multiple integrated butterfly valve 2 (a state shown by a solid line).
Via the bypass intake passage 3 as shown by the arrow A,
In the high-speed range, the valve element 2a is opened (the state shown by the two-dot chain line), and is directly introduced into the engine cylinder as shown by the arrow B without passing through the bypass intake passage 3. .

That is, the opening and closing of the valve body 2a synchronizes a pressure reversal wave due to a long intake pipe at low and medium speeds and a pressure reversal wave due to a short intake pipe at high speeds, thereby improving the filling efficiency of the entire region. The purpose of the present invention is to improve both low and medium speed torque and maximum output. Further, in an intake control device employing such a variable intake system, a main body portion forming an intake passage and a surge tank is formed by casting using an aluminum material, and the valve body 2a and its rotating shaft 2b are formed of a steel material. And the like.

[0005] Due to such casting technology restrictions, the intake control device is provided with three regions, namely, a branch portion (I) that forms only the intake passage, a multiple-integrated butterfly valve 2 and the intake passage. The valve body part (II) to be formed and the cover part (III) which forms the surge tank 1 and houses the port shell 4 which forms a part of the bypass intake passage 3 are separately formed, and thereafter, the bolts and nuts and the like are formed. The fastening flanges (not shown) are used to integrally connect the respective mounting flange surfaces together.

Further, as shown in FIG. 2, the multiple integral type butterfly valve 2 has a notch formed in a portion corresponding to each intake passage of one rotary shaft 2b, and a valve is formed in this region. The body 2a is fixed using a fastening means such as a small screw 2c, and the rotating shaft 2 to which the valve body 2a is fixed.
By connecting a driving means including, for example, the arm 2d and the actuator 5 to one end of the valve b, all the valves can be integrally rotated.

[0007] The method of assembling and supporting the multiple integral type butterfly valve is described by drilling or the like so as to be orthogonal to each intake passage from the outer surface of the valve body portion (II). 6, the rotating shaft 2b is inserted from the open end of the bearing hole 6, and then, in each intake passage, the valve body 2a is fixed to the rotating shaft 2b with a small screw 2c or the like. Have been.

On the other hand, as one of today's automobile development policies, the development of a fuel-efficient vehicle by reducing the weight of the vehicle or the development of a low-cost vehicle by changing the material and simplifying the manufacturing process are being studied. Therefore, the use of a resin material as a part of the intake control device, which has been conventionally formed of a metal material such as an aluminum material or a steel material, is being studied.

However, in order to make the components constituting the conventional intake control device, particularly the multiple integral butterfly valve, into a resin, a conventional injection molding method (for example, an injection port of a resin material is provided near the center of the cavity of the mold). Injection molding by injection molding), the dimensional variation of the molded product becomes much larger than that of a conventional metal product.
If the size of such a molded body is smaller than the required value, the gap between the valve body and the inner wall of the intake passage becomes larger, or the valve body and the inner wall of the intake passage come into contact in the axial direction of the rotating shaft, and on the other hand, the larger than the required value. If this is the case, it may not be possible to assemble the valve itself.

[0010] Further, since the resin material has a lower mechanical strength than the metal material, a countermeasure corresponding to the mechanical strength is required.

[0011]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, it is an object of the present invention to improve the dimensions of molded products and improve mechanical strength while reducing the weight of products. Accordingly, it is an object of the present invention to provide a multiple-integrated butterfly valve for an intake control device of a multi-cylinder internal combustion engine, which can guarantee the function of the device main body, and a device for manufacturing the same.

[0012]

According to the present invention, there is provided a multiple-integrated butterfly valve comprising: a rotary shaft which is supported through a shell forming an intake passage communicating with each cylinder of a multi-cylinder internal combustion engine; A multi-integrated butterfly valve for an intake control device for a multi-cylinder internal combustion engine, comprising a valve body supported on the rotating shaft and disposed in each of the intake passages so as to open and close the valve. The rotating shaft is integrally formed of a resin material containing reinforcing fibers, and the fibers are oriented in the axial direction of the rotating shaft.

The apparatus for manufacturing a multiple-integrated butterfly valve according to the present invention further comprises a rotating shaft that is pivotally supported through a shell forming an intake passage communicating with each cylinder of the multi-cylinder internal combustion engine. A pair of molds forming a cavity forming the outer shape of a multiple integral type butterfly valve composed of a valve body supported on a rotating shaft and disposed on each of the intake passages so as to be able to open and close the intake passage; An apparatus for manufacturing a multiple-integrated butterfly valve for an intake control device of a multi-cylinder internal combustion engine having an inlet that opens, wherein the inlet is formed from a portion corresponding to one end of the rotating shaft of the cavity. It is characterized in that it is provided in a region corresponding to a distance of 1/5 of the entire length of the rotating shaft.

[0014]

According to the multiple integral type butterfly valve of the present invention, since the reinforcing fiber material contained in the resin material is oriented in the direction of the rotation axis of the valve, the bending rigidity in the bending direction of the rotation axis or The torsional rigidity in the rotating direction is increased, which contributes to the improvement of impact resistance and the like.

According to the apparatus for manufacturing a multiple integral butterfly valve of the present invention, since the reinforcing fiber-containing resin material is injected and injected into the cavity from near one end of the rotating shaft, the molten flow of the injected resin is increased. The reinforcing fibers included in the resin material are continuously oriented in the longitudinal direction of the rotation axis along the direction, and the reinforcing fibers do not become discontinuous particularly in a region located between the valve bodies, and the fibers are continuously connected. The dimensional accuracy of the integrated butterfly valve is also high.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a multiple-integrated butterfly valve for an intake control device of a multi-cylinder internal combustion engine according to the present invention will be described below with reference to the drawings. FIG. 3 is a plan view showing the external appearance of the intake control device. As shown in the drawing, the intake control device is formed of a combination of an injection molded product of a reinforcing fiber-containing resin forming three regions I, II, and III. That is,
A branch portion (I) connected to the head intake port of the engine, a valve body portion (II) as a shell housing a multiple integrated butterfly valve serving as an intake switching valve, a surge tank and a cover forming a bypass intake passage Part (II
I) are each formed by an injection molding method, and thereafter, each is integrally joined by vibration welding or the like on the joining flange surface.

FIG. 4 shows the intake control device shown in FIG.
FIG. 1 is a side view showing an external appearance of a vehicle, and as shown, a flange portion 10 for mounting a throttle body for adjusting the output of an engine is formed. FIG.
FIG. 4 is a side view showing the external appearance of the intake control device shown in FIG. 3 as viewed in the direction of arrow L. As shown in the figure, the multiple integrated butterfly valve 21 (shown in FIG. 6) is provided on the side.
An actuator 30 having a gear mechanism for driving the actuator is mounted.

Incidentally, reference numeral 2 shown in FIG. 3 and FIG.
Numeral 0 indicates the appearance of an end bearing that supports one end of the valve rotation shaft in the radial direction, and at this position, the rotation shaft of the multiple integral butterfly valve is arranged. FIG.
Is a cross-sectional view taken along the line CC in FIG.
As shown in the figure, inside a valve body portion (II), a multiple integrated butterfly valve 21 in which a valve body 21a and a rotating shaft 21b are integrally formed of a resin material is provided with an intermediate bearing 22. And rotatably supported in the intake passage. Also, inside the cover part (III),
A port shell 40 for forming a bypass intake passage is arranged and fixed in contact with the inner wall of the cover portion (III).

Here, the multiple integral type butterfly valve 21
Will be described in more detail. As shown in FIG. 7, six valve bodies 21a corresponding to the intake ports of a six-cylinder engine are integrally formed with a rotating shaft 21b that rotatably supports them by using a resin material containing reinforcing fibers. It is formed by an injection molding method. Examples of the fiber reinforced resin material used here include polyphenylene ether (PPE), polyamide (PA), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), liquid crystal polyester, polycarbonate (PCa), and polyphenylene sulfide (PPS). One or more inorganic reinforcing fibers such as glass fibers, carbon fibers, and potassium titanate whiskers are added to a thermoplastic resin or a mixture of these resins.
0% by weight, preferably 15 to 45% by weight.

Polyamide (PA) generally includes PA6, P
A66, PA610, PA612, PA11, PA12, PA
46 and the like, and these may be used alone or as a mixture of one or more kinds. These thermoplastic resins are generally called engineering plastics, and have a melting point or a thermal denaturation temperature of 180 ° C. or higher and a flexural modulus (JIS K 6911) of 15,000 to 50,000 kg / cm ² .

As shown in the schematic sectional view of FIG. 8, the reinforcing fibers 21c contained in the resin material are oriented in the longitudinal direction of the multiple integral butterfly valve 21, that is, in the axial direction of the rotating shaft 21b. Has become. Since the reinforcing fibers are oriented in the longitudinal direction of the shaft of the multiple integral butterfly valve, the mechanical strength such as the bending rigidity and the torsional rigidity of the rotating shaft 21b located between the valve bodies 21a is increased. In addition, the shrinkage deformation of the molded body in the axial direction is minimized, and the separation distance between the valve bodies 21a can be made high precision. The flexural modulus of this fiber reinforced resin is 45,000.
It shows a value of 0 to 200,000 kg / cm ² .

Next, a description will be given of an apparatus used for manufacturing the above-mentioned multiple integral type butterfly valve by an injection molding method. FIG. 9 is a partial view of an injection molding apparatus used when integrally forming a multiple integral butterfly valve. Fig. 9 (a)
As shown in FIG. 5, a multiple integrated butterfly valve 21 is formed by a pair of molds including a movable mold 51 and a fixed mold 52.
Is formed, in which a valve body cavity portion 53a corresponding to the valve body 21a and a rotation shaft cavity portion 53b corresponding to the rotation shaft 21b are respectively continuously formed to form an integrated space. doing.

The stationary mold 52 has an injection molding nozzle 5
A passage for guiding the molten reinforcing fiber-containing resin material injected from 5 is formed, and an injection port 54 is formed at one longitudinal end of the cavity 53. That is,
The molten reinforcing fiber-containing resin material is injected into the cavity 53 from one end of the cavity 53 in the longitudinal direction (axial direction of the rotation shaft).

FIG. 9B is a schematic view of the injection molding apparatus shown in FIG. 9A. Note that, as shown in FIG. 7, the multiple integral type butterfly valve molded in the present embodiment
In dimensions after molding, as the overall length L ₁ is 300 mm, H ₁ and H ₂ dimensions of the valve body is 60mm and 45mm, respectively,
A cavity dimension is formed. 10 to 12
FIG. 10 is a schematic view of the injection molding apparatus when the position of the injection port or the number of the injection ports is changed with respect to the injection molding apparatus shown in FIG. Specifically, FIG. 10 shows two injection ports 5.
4a and 54b, one of the injection ports 54a
Is provided at one end of the cavity 53 (a portion corresponding to one end of the rotating shaft 21b), and the other injection port 54b is provided at a portion located at a distance of about one fifth of the entire length from the one end of the cavity 53 described above. Is provided.

FIG. 11 is a view similar to FIG.
a and 54b, but the other injection port 54b
Is provided at a portion located at a distance of about one third of the entire length from one end of the cavity 53. FIG. 12 shows a configuration in which inlets 54a to 54f are provided in portions 53a of the cavity 53 forming the valve body 21a, respectively, and a total of six inlets are arranged so as to be evenly spaced.

The molding dimensional accuracy required for the multiple (six) integral type butterfly valve according to the present embodiment is determined by the total length L _1.
In case of, 300mm length, maximum value 300.05mm, minimum value 2
It must be 99.95 mm, and the dimensional variation width must be within the range of 0.10 mm. Further, the positional accuracy of the valve body 21a, i.e., there is a need for similar accuracy for the dimensions of P ₁ to P _5.

Therefore, under the above-mentioned requirements for the molding dimensions of the multiple integral type butterfly valve, FIGS.
Each molding experiment was performed using the injection molding apparatus shown in FIG. The results are shown in Examples 1 to 9 and Comparative Example 1.
A description will be given below as Comparative Example 3.

[0028]

Embodiment 1 Using an injection molding apparatus shown in FIG. 9, the nozzle temperature was set to 280 ° C. and the mold temperature was set to 90 ° C.
Is mixed with 50 parts by weight of 100 parts by weight of a resin, and 35 parts by weight of glass fiber is added to the fiber-reinforced resin material (trade name “REMALLOY BX518L” manufactured by Mitsubishi Yuka Corporation)
Injection molding of 300 continuous shots was performed. As a result, the dimensional variation is the difference between the maximum and minimum values for a total length of 300 mm.
0.07mm, satisfying the required accuracy. The flexural modulus of the molded article was about 100,000 kg / cm ² .

[0029]

Example 2 Using the injection molding apparatus shown in FIG. 10, the nozzle temperature was set at 280 ° C. and the mold temperature was set at 90 ° C., and the fiber reinforced resin material used in Example 1 (trade name, manufactured by Mitsubishi Yuka Co., Ltd.) "Remalloy BX518L") was used to perform continuous 300 shot injection molding. As a result, the dimensional variation is 300m in total length
The difference between the maximum and minimum values for m was 0.08 mm, satisfying the required accuracy.

[0030]

Embodiment 3 Using the injection molding apparatus shown in FIG. 9, the nozzle temperature was set to 290 ° C. and the mold temperature was set to 90 ° C.
6 to 50 parts by weight of a resin mixed with 50% by weight,
A continuous 300 shot injection molding was carried out using a fiber reinforced resin material (trade name “Remaloy BX518L” manufactured by Mitsubishi Yuka Co., Ltd.) to which 35 parts by weight of glass fiber was added. as a result,
Regarding the variation in dimensions, the difference between the maximum value and the minimum value was 0.07 mm for a total length of 300 mm, satisfying the required accuracy.

[0031]

Embodiment 4 Using an injection molding apparatus shown in FIG. 9, the temperature of the nozzle was set to 290 ° C. and the temperature of the mold was set to 90 ° C.
Continuous by a fiber reinforced resin material (trade name “A3WG7” manufactured by BASF) with 35 parts by weight of glass fiber added to parts by weight
Injection molding of 300 shots was performed. As a result, the difference between the maximum and minimum values was 0.09 for a total length of 300 mm.
mm, satisfying the required accuracy.

[0032]

Embodiment 5 Using an injection molding apparatus shown in FIG. 9, a nozzle temperature of 300.degree. C. and a mold temperature of 90.degree. C. were used, and a fiber reinforced resin material (Philips) was prepared by adding 35 parts by weight of glass fiber to 100 parts by weight of polyphenylene sulfide. Injection molding of continuous 300 shots was carried out under the trade name of “Ryton G4” manufactured by the company. As a result, the difference between the maximum value and the minimum value was 0.09 mm for the total length of 300 mm, satisfying the required accuracy.

[0033]

Embodiment 6 Using the injection molding apparatus shown in FIG. 9, the nozzle temperature was set to 280 ° C. and the mold temperature was set to 90 ° C.
Was mixed with 50% by weight of each resin and 100 parts by weight of carbon fiber was added to the resin, and a continuous shot injection of 300 shots was performed using a fiber reinforced resin material (trade name “BX518W” manufactured by Mitsubishi Yuka Co., Ltd.). . As a result, the dimensional variation was 0.08 mm, the difference between the maximum value and the minimum value for a total length of 300 mm, satisfying the required accuracy.

[0034]

Embodiment 7 Using an injection molding apparatus shown in FIG. 9, a nozzle temperature of 270 ° C. and a mold temperature of 60 ° C. were used. Product name “Juranex 330
0 ”), injection molding was performed continuously for 300 shots. As a result, the dimensional variation was 0.08 mm, the difference between the maximum value and the minimum value for a total length of 300 mm, satisfying the required accuracy.

[0035]

Embodiment 8 Using an injection molding apparatus shown in FIG. 9, a nozzle temperature of 270.degree. C. and a mold temperature of 60.degree. Co., Ltd. product name "Remappet 330")
Injection molding of 300 continuous shots was performed. As a result, the dimensional variation is the difference between the maximum and minimum values for a total length of 300 mm.
0.09mm, satisfying the required accuracy.

[0036]

Embodiment 9 A fiber reinforced resin material (Mitsubishi Gas Chemical Co., Ltd.) in which 30 parts by weight of glass fiber was mixed with 70 parts by weight of polycarbonate using an injection molding apparatus shown in FIG. 9 at a nozzle temperature of 300 ° C. and a mold temperature of 90 ° C. Company name "Iupilon GS2"
030 "), injection molding was performed continuously for 300 shots. As a result, as for the dimensional variation, the difference between the maximum value and the minimum value was 0.09 mm for a total length of 300 mm, satisfying the required accuracy.

[0037]

Comparative Example 1 The fiber-reinforced resin material used in Example 1 (manufactured by Mitsubishi Oil Chemical Co., Ltd.) was set at 280 ° C. nozzle temperature and 90 ° C. mold temperature using the injection molding apparatus shown in FIG. Under the name “Remalloy BX518L”, injection molding of 300 continuous shots was performed. As a result, the dimensional variation is 30
The difference between the maximum value and the minimum value was 0.12 mm for 0 mm, which did not satisfy the required accuracy.

[0038]

Comparative Example 2 Using the injection molding apparatus shown in FIG. 12, the nozzle temperature was set to 280 ° C. and the mold temperature was set to 60 ° C.
Is continuously mixed with a resin material (trade name “REMALLOY BX505”, manufactured by Mitsubishi Yuka Co., Ltd.) in which
Injection molding of 300 shots was performed. As a result, the dimensional variation is that the difference between the maximum value and the minimum value is 0.4 m for a total length of 300 mm.
m, which did not meet the required accuracy. The flexural modulus of the molded product was about 21,000 kg / cm ² .

[0039]

Comparative Example 3 Using the injection molding apparatus shown in FIG. 12, the nozzle temperature was set to 280 ° C. and the mold temperature was set to 90 ° C., and the fiber-reinforced resin material used in Example 1 (trade name, manufactured by Mitsubishi Yuka Co., Ltd.) "Remalloy BX518L") was used to perform continuous 300 shot injection molding. As a result, the dimensional variation is 300m in total length
The difference between the maximum value and the minimum value for m was 0.17 mm, which did not satisfy the required accuracy.

As is clear from the above Examples and Comparative Examples, the injection port 54 for injecting the molten resin material into the cavity 53 has a length of 5 minutes from one end in the longitudinal direction (axial direction of the rotating shaft). By providing the fibers 21c in the region of the portion located at the distance of 1, the fibers 21c are also oriented along the axial direction, particularly on the rotating shaft portion corresponding to the space between the valve bodies 21a. Deformation (for example, shrinkage deformation in the axial direction) is suppressed as much as possible, so that a highly accurate molded product can be obtained.

[0041]

As described above, according to the multiple-integrated butterfly valve for the intake control device of the multi-cylinder internal combustion engine of the present invention, the valve element (21a) and the rotating shaft (21) supporting the valve element (21a).
b) is integrally molded from a resin material containing reinforcing fibers, and the reinforcing fibers (21c) are oriented in the axial direction of the rotating shaft (21b), so that the bending rigidity or torsional rigidity of the rotating shaft is increased. And the mechanical strength can be improved while reducing the weight of parts.

According to the apparatus for manufacturing a multiple integral butterfly valve of the present invention, the cavity (53) forming the outer shape of the multiple integral butterfly valve is moved from the portion corresponding to one end of the rotating shaft to the cavity (53). An injection port 54 is provided in a region corresponding to a distance of one-fifth of the entire length of the rotating shaft, and a resin material containing reinforcing fibers is injected and injected into the cavity from the injection port, thereby forming a resin material. The reinforcing fibers included are continuously oriented in the longitudinal direction of the rotation axis, and the reinforcing fibers do not become discontinuous particularly in a region located between the valve elements. Therefore, shrinkage deformation of the valve after molding is suppressed as much as possible, and a molded product with high accuracy and small variation can be obtained, and the yield of the product can be improved.

[Brief description of the drawings]

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

FIG. 2 (a) is a schematic perspective view of a multiple-integrated butterfly valve used in a conventional intake control device, and FIG. 2 (b) is a diagram illustrating such a butterfly valve having an intake passage of the intake control device. FIG. 4 is a cross-sectional view showing a state in which the device is arranged inside.

FIG. 3 is a plan view of the intake control device according to the embodiment of the present invention.

FIG. 4 is an external side view of the intake control device as viewed from an arrow R in FIG. 3;

FIG. 5 is an external side view of the intake control device taken along line L in FIG. 3;

FIG. 6 is a cross-sectional view of the intake control device taken along the line CC in FIG. 3;

FIG. 7 (a) is a plan view of a multiple-integrated butterfly valve for an intake control device according to the present invention, and FIG. 7 (b) is a side view of the same taken along arrow S.

FIG. 8 is a schematic cross-sectional view showing an orientation state of fibers in a multiple integral butterfly valve according to the present invention.

FIG. 9 (a) is a partial cross-sectional view showing a mold part of an injection molding apparatus used for manufacturing a multiple integral type butterfly valve according to the present invention, and FIG. 9 (b) is FIG. 9 (a). FIG. 2 is a schematic view of the injection molding apparatus shown in FIG.

FIG. 10 is a schematic view showing another injection molding apparatus.

FIG. 11 is a schematic view showing another injection molding apparatus.

FIG. 12 is a schematic view showing another injection molding apparatus.

[Description of Signs of Main Parts]

 Reference Signs List 21 Multiple integrated butterfly valve 21a Valve 21b Rotating shaft 21c Fiber 51 Movable mold 52 Fixed mold 53 Cavity 53a Valve body cavity 53b Rotation shaft cavity 54, 54a, 54b Injection 55 Injection nozzle

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 13/02 F02M 13/02 E 17/40 17/40 A // B29K 105: 12 B29L 31:00 (72) Inventor Miyake Mitsuhiro 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Shigekazu Yamauchi 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation (72) Inventor Hideo Kakinuma 2480 Kuno, Odawara City, Kanagawa Prefecture Inside the Mikuni Odawara Plant (72) Inventor Shinnobu Shinnobu 2480 Kuno, Odawara City, Kanagawa Prefecture Inside the Mikuni Odawara Plant (72) Inventor Shigeyuki Ishiguro 2480 Kuno, Odawara City, Kanagawa Prefecture Co., Ltd. Mikuni Odawara Plant (72) Inventor Shigeo Tsukagoshi 2--14 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa 10-10 Tokyo Roki Co., Ltd. (72) Inventor Miyahisa Hisashi 2-14-14 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture, Tokyo 10 Roki Co., Ltd. No. 1, Toho-cho, Yokkaichi-shi, Mie Prefecture Mitsubishi Yokkaichi Co., Ltd. Yokkaichi Research Laboratory (56) References JP-A-63-98409 (JP, A) JP-A-2-40033 (JP, A) 44974 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 9/00-9/18 B29C 45/00-45/24 B29C 45/46-45/63 B29C 45/70 -45/72 B29C 45/74-45/84 F16K 1/00-1/54

Claims (2)

(57) [Claims] 1. A rotary shaft that is pivotally supported through a shell that forms an intake passage that communicates with each cylinder of a multi-cylinder internal combustion engine, and that is supported by each of the rotary shafts. A multi-cylinder integrated butterfly valve for an intake control device of a multi-cylinder internal combustion engine, comprising a valve body that is openably and closably disposed, wherein the valve body and the rotation shaft are formed of a resin material containing integrally molded reinforcing fibers. Wherein the reinforcing fibers are oriented in the axial direction of the rotating shaft. A multiple-integrated butterfly valve for an intake control device of a multi-cylinder internal combustion engine. 2. A rotary shaft that is supported through a shell that forms an intake passage that communicates with each cylinder of a multi-cylinder internal combustion engine and that is supported by the rotary shaft. For an intake control device for a multi-cylinder internal combustion engine having a pair of molds forming a cavity forming an outer shape of a multiple integrated butterfly valve composed of a valve body that can be opened and closed, and an inlet opening into the cavity. A device for manufacturing a multiple-integrated butterfly valve, wherein the inlet corresponds to a distance corresponding to one-fifth of the entire length of the rotating shaft from a portion of the cavity corresponding to one end of the rotating shaft. A multi-integrated butterfly valve manufacturing apparatus for an intake control device for a multi-cylinder internal combustion engine, wherein