JP2000337217A - Manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the sticking retension of a mixture in a cylinder body to improve combustion efficiency by forming a coating layer formed at an inner peripheral surface and a joint face of a cylinder body constituting an intake manifold, using fluorinated coating material containing fluoro-rubber and fluororesin. SOLUTION: An intake manifold 15 of an engine has a thick-walled cylinder body 16 formed of hydrin rubber. A flange 8 is vulcanization-bonded to the joint face 5 side end part of the cylinder body 16, and an insert cylinder 11 for inserting an air charging part of a carburetor is formed at an end part on the opposite side to the joint face 5 of the cylinder body 16. A coating layer 17 for preventing the cylinder body 16 from being swollen by fuel is formed at an inner peripheral surface 9, the joint face 5 and a flange side joint face 7 of the cylinder body 16. The coating layer 17 is formed using fluorinated coating material prepared containing fluoro-rubber and fluororesin, and its durability is enhanced while preventing the sticking retension of a mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a manifold for connecting an engine and a carburetor, and more particularly, to a cylinder made of a rubber material having an end face to be joined to the engine at one end face, and joining the cylinder body. A flange having a flange-side joint surface flush with the joint surface is formed on the outer periphery of the surface-side end portion, and the other end of the cylindrical body facing the joint surface-side end portion is supplied with air supplied by a carburetor. The present invention relates to a manifold in which an insertion tube into which a part is inserted is formed, and a coating layer made of a fluorine-based coating material is formed on at least an inner peripheral surface of the cylindrical body, the joining surface, and the flange-side joining surface.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 8 and 9, as a connecting means for connecting an engine 1 and a carburetor 2 for supplying a mixture of fuel such as gasoline and air to the engine 1, Manifold 3 was used.

The manifold 3 has a thick cylinder 4 made of a rubber material. On one end surface of the cylindrical body 4,
A joint surface 5 with the engine 1 is formed, and a plurality of annular projections 6 for maintaining airtightness between the engine 1 and the joint surface 5 are formed on an outer edge of the joint surface 5. I have.

[0004] A metal or resin flange 8 having a flange-side joint surface 7 flush with the joint surface 5 is provided on the outer peripheral surface of the end of the cylindrical body 4 on the joint surface 5 side.
The flange 8 and the cylindrical body 4 are vulcanized and bonded.
At four corners of the flange 8, there are formed joining holes 10 for joining the flange 8 to the engine 1 via bolts or the like.

[0005] At the other end of the cylindrical body 4 opposite to the end of the joining surface 5 side, an insertion cylinder 11 for inserting the air supply portion 2a of the carburetor 2 is formed.

When the manifold 3 is used, as shown in FIG. 9, the manifold 3 is joined to the engine 1 via the joining surface 5 and the flange-side joining surface 7, and The engine 1 and the carburetor 2 are connected by fixing the air supply unit 2a of the carburetor 2 to the insertion tube 11 with a band in a state where the carburetor 2 is inserted into the carburetor 2. A mixture of fuel and air is supplied from the carburetor 2 into the engine 1 while the engine 1 and the carburetor 2 are connected by the manifold 3.

[0007] In this way, the conventionally used manifold
Hold 3 is often made of nitrile rubber or hydrid
It was formed by a simple rubber.

However, the manifold 3 is used in a fuel system of a motorcycle, an outboard motor of a marine vessel, or the like. Each of these rubbers is used alone as a base material.However, these rubbers have a greater degree of swelling in fuel oil than fluororubber and lack dimensional stability. Differences can occur and affect combustion efficiency.

Although it is conceivable to use a fluorine rubber having fuel oil resistance alone, in this case, the material price is high,
There is a difficulty in moldability.

Therefore, in order to compensate for these drawbacks, a manifold 3 in which a coating layer 13 made of a fluororesin material is formed on the inner peripheral surface 9 and the joining surface 5 of the cylindrical body 4 and the joining surface 7 on the flange side is also proposed. It had been.

By using the manifold 3 on which the coating layer 13 made of the fluororesin material is formed, the fuel in the air-fuel mixture permeates the cylinder 4 and the cylinder 4 swells. It has been described that the air-fuel mixture can be properly supplied from the carburetor 2 to the engine 1 because the dimensional stability can be improved.

[0012]

However, in the conventional manifold 3, the adhesion between the coating layer 13 made of the fluororesin material and the cylinder 4 made of the rubber material is poor in an atmosphere of fuel oil. This was not practical because blisters and adhesion peeling were likely to occur on the coating surface.

Further, since the coating layer 13 made of the fluorine-based resin material was poor in flexibility, the coating layer 13 was easily damaged by vibration or impact applied to the cylinder 4.

For this reason, the swelling of the cylinder 4 due to the air-fuel mixture cannot be effectively suppressed, and the air-fuel mixture cannot be properly supplied from the carburetor 2 to the engine 1, thereby improving the combustion efficiency of the engine. There was a problem that it could not be performed.

Further, hydrin rubber as a material of the manifold 3 has a disadvantage that it corrodes a metal surface of an engine because of its metal corrosiveness, and nitrile rubber has a disadvantage that its ozone resistance is inferior. Have.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to suppress swelling of a rubber material constituting a cylinder by fuel in an air-fuel mixture, and to appropriately supply the air-fuel mixture from a carburetor to an engine. It is an object of the present invention to provide a manifold that can reduce the gap between the initial performance and the durability performance of the engine and thereby improve the combustion efficiency of the engine, and also suppress the corrosion of the metal surface of the engine by hydrin rubber. Is what you do.

[0017]

In order to achieve the above object, a feature of the manifold according to the first aspect of the present invention is that the fluorine-based coating material contains a fluorine rubber and a fluorine resin.

By adopting such a configuration, it is possible to improve the fuel barrier property, dimensional stability, adhesion stability and corrosion resistance of the mating metal due to the mixture of hydrin rubber.

A feature of the manifold according to the second aspect is that, in the first aspect, a primer-treated layer with an aminosilane compound is formed below the coating layer.

[0020] By adopting such a configuration, the adhesion between the cylinder and the coating layer can be improved via the primer treatment layer. The coating state of the surface, the joining surface, and the flange-side joining surface can be stably maintained.

According to a third aspect of the present invention, in the first or second aspect, the cylindrical body is made of hydrin rubber.

By adopting such a structure, it is possible to maintain good adhesion between the base rubber and the fluorine-based coating material in the fuel oil without losing the flexibility of the cylindrical body. In addition, the manufacturing cost of the cylindrical body can be made lower than that of fluororubber.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a manifold according to the present invention will be described below with reference to FIGS.

Note that portions having the same basic configuration as the conventional manifold 3 will be described with the same reference numerals.

As shown in FIG. 1, the manifold 15 in this embodiment is a thick cylinder 1 made of hydrin rubber.
6. As shown in FIGS. 2 and 3, a joint surface 5 with the engine 1 is formed on one end surface of the cylindrical body 16, and an outer edge of the joint surface 5 has a joint surface 5 with the engine 1. A plurality of annular projections 6 shown in FIG. 4 for maintaining airtightness are formed.

A metal or resin flange 8 having a flange-side joint surface 7 flush with the joint surface 5 is vulcanized and bonded to the outer peripheral surface of the end of the cylindrical body 16 on the joint surface 5 side. I have. At four corners of the flange 8, there are formed joining holes 10 shown in FIGS. 5 and 6 for joining the flange 8 to the engine 1 via bolts or the like.

At the other end of the cylindrical body 16 facing the end on the joint surface 5 side, an insertion tube 11 for inserting the air supply portion 2a of the carburetor 2 is formed.

Returning to FIG. 2, on the inner peripheral surface 9 and the joint surface 5 of the cylindrical body 16 and on the flange-side joint surface 7,
A coating layer 17 made of a fluorine-based coating material is formed to prevent the cylinder 16 from swelling due to fuel contained in the air-fuel mixture flowing in the cylinder 16.

In this embodiment, the fluorine-based coating material contains a fluorine rubber and a fluorine resin.

Under the coating layer 17 of the fluorine-based coating material, good adhesion between the fluorine-based coating material and the inner peripheral surface 9 and the bonding surface 5 of the cylindrical body 16 and the flange-side bonding surface 7 is excellent. A primer treatment layer 18 of an aminosilane compound is formed.

Next, the operation of the present embodiment will be described.

When the manifold 15 in this embodiment is used, the manifold 15 is joined to the engine 1 via the joining surface 5 and the flange-side joining surface 7 as in the conventional case, and the manifold 11 is vaporized. With the air supply section 2a of the vessel 2 inserted, the air supply section 2a and the insertion tube 11 are inserted.
The carburetor 2 and the engine 1 are connected through a manifold 15 by fixing the carburetor 2 and the band.

Then, a mixture is supplied from the carburetor 2 to the engine 1 while the carburetor 2 and the engine 1 are connected via the manifold 15.

The mixture supplied from the carburetor 2 flows toward the engine 1 through the inner peripheral surface 9 of the cylinder 16.
At this time, a coating layer 17 made of the fluorine-based coating material containing fluorine rubber and fluorine resin is formed on the inner peripheral surface 9 and the joint surface 5 of the cylindrical body 16 and on the flange-side joint surface 7. Therefore, the fuel in the air-fuel mixture is prevented from adhering and staying on the inner peripheral surface 9 and the joint surface 5 of the cylindrical body 16 and the flange-side joint surface 7. Further, since the fluorine-based coating material contains a flexible fluorine rubber having excellent elasticity, even if vibration or impact is applied to the manifold 15, the vibration can be absorbed, so that the coating layer 17 has cracks or cracks. There will be no breakage. Therefore, the swelling of the cylinder 16 due to the air-fuel mixture can be suppressed, and the dimensional stability of the manifold 15 can be improved over a long period of time.

Further, during the heat treatment of the coating of the manifold 15, a fluororesin component is deposited on the surface of the coating layer 17, and the deposited fluororesin exerts a fuel barrier effect. 16
Swelling and air permeability of the air-fuel mixture can be more effectively suppressed, and the adhesion between the flange-side joint surfaces 7 and 5 and the metal surface of the engine can be eliminated. Corrosion resistance can be improved.

Further, since a primer treatment layer 18 made of an aminosilane compound is formed under the coating layer 17, the coating layer 17 is
6 hardly peeled off.

Further, since the cylindrical body 16 is made of hydrin rubber having a certain flexibility, good adhesion between the cylindrical body 16 and the coating layer 17 is maintained.

Next, the manifold 1 in the present embodiment will be described.
The evaluation test performed in No. 5 will be described.

The manifolds used in this test are a total of eight products shown in Examples 1 to 4 and Comparative Examples 1 to 4 in Table 1.

To manufacture the products of Examples 1 to 4, first, each hydrin rubber (Zeklon 100) shown in Table 1 was used.
0 (CO), Zeklon 2000 (ECO), Epichromer C (ECO) and Zeklon 3100 (GECO))
Are kneaded with an open roll or an intensive mixer, respectively, and the kneaded hydrin rubber is subjected to compression molding or injection molding using each of the crosslinking compositions to obtain a vulcanized product. After the sample surface of the vulcanized product is degreased, a primer of an aminosilane compound is applied thereon and dried at 40 to 100 ° C. for about 5 to 15 minutes to form the primer-treated layer 18.

Next, a fluorine-based coating material containing a fluororubber and a fluororesin component is spray-coated on the upper layer of the primer-treated layer 18, dried, and dried.
The coating layer 17 is formed by performing a heat treatment at a temperature of about 5 minutes to 2 hours.

As the fluorine-based coating material, for example, a commercially available product, Daikin Latex Series manufactured by Daikin Industries, Ltd. can be used. That is, either DAI-LEX GLS (aqueous type) or DAI-LEX DPS (solvent series) may be used.
These fluorine-based coating materials are paints prepared by mixing 5 parts of a DIAL latex GLS213-B liquid (curing agent) with 100 parts of a DAILER latex GLS213-A liquid (main agent) as a compounding agent.

Further, as the silane-based primer,
γ-aminopropyltriethoxysilane (A1100 /
Nippon Unicar), N-β-amylethyl-γ-aminopropyltrimethoxysilane (SH6020 / Dow Corning Toray Silicone), N-β-amylethyl-γ-
Aminopropylmethyldimethoxysilane (SZ6023
/ Toray Dow Corning Silicone), N-β-phenylmethyl-γ-aminopropyltrimethoxysilane hydrochloride (SZ6032 / Toray Dow Corning Silicone)
It is desirable to use aminosilane such as The thickness of the coating layer of the fluorine-based coating material is 10
１００100 μm.

On the other hand, in Comparative Example 1, the primer treated layer 18
This is a product in which only the coating layer 17 is formed without forming a coating.

In Comparative Example 2, the primer treated layer 18
And the coating layer 17 was not formed.

Further, Comparative Example 3 is a product in which the coating layer 17 is formed of a fluororesin material (Emuralon 333) containing no fluororubber.

In Comparative Example 4, a silane compound of mercaptosilane (SH6062 / Toray
Primer treated layer 1 by Dow Corning Silicone)
8 is a product formed.

The following tests were performed on the products of Examples 1 to 4 and Comparative Examples 1 to 4. (1) Dimensional change rate of gasoline immersion test As shown in FIG. 7, a steel plate (SC45C) is joined to the product via the joining surface 5 and the flange-side joining surface 7, and via the insertion tube 11. Product and vaporizer 2
And JIS-K625
Test fuel oil-C (isooctane / toluene =
(50/50) to half of the internal volume of the product
After immersion for a time, the dimensional change rate in the range of A in FIG. 3 was measured. (2) Cross-cut peeling test After immersing the product in fuel oil for 70 hours, the coating on the flat portion (flange side joining surface 7) of the flange 8 on which the coating film was applied was cut with a sharp blade to reach 1 mm. Then, a cellophane tape is stuck on the grid and strongly pressed with a finger, and immediately peeled off to check the number of strips. (3) Corrosion resistance of gasoline immersion test In the test of the above (1), a test piece made of a steel plate (S45C) was polished with a No. 400 sandpaper and degreased on a mating mounting jig on the flange 8 of the product, and then mounted. The corrosion resistance was examined. (4) Single-sided immersion test A single-sided immersion test method shown in JIS-K6258 was used. The test pieces were each of the rubber compounding compositions shown in Table 1 and had a thickness of 2
After preparing a millimeter vulcanized sheet and treating it with a coating film, a test piece was prepared and mounted on a one-side immersion apparatus in such a manner that the coating film side was in contact with the target liquid, and a test was conducted.
The test was performed using the above fuel oil-C as a target liquid. The test measured the change in mass after immersion for 70 hours at room temperature. (5) Elongation test A sample prepared in the same manner as in (4) above was punched out with a JIS-3 dumbbell test piece and tested using the fuel oil-C as a target liquid in accordance with the immersion test method shown in JIS-K6258. Was done. The test conditions were as follows: Immersed at room temperature for 70 hours, immediately put on a tensile tester, observed the presence or absence of adhesive peeling by the displacement between the rubber and the coating film at the time of elongation at break, and investigated the adhesion of the coating.

[0049]

[Table 1]

As shown in Table 1, as shown in FIG.
In the dimensional change test (1), the products of Examples 1 to 4 in which the coating layer 17 was formed from the fluorine-based coating material containing fluorine rubber and fluororesin, the dimensional change rate was 1.6 to 2 .1%. In the cross-cut peeling test (2), Example 1 was used.
In addition, the number of peeled pieces of all products of Example 4 to 0 was zero. In the corrosion resistance test (3), there was no abnormality in all the products of Examples 1 to 4. Further, the products of Examples 1 to 4 showed a change in mass of 75 to 95 (g / m ² ) in the single-side immersion test (4). Further, in the stretching test (5), none of the products of Examples 1 to 4 was subjected to stretch peeling.

On the other hand, Comparative Example 1 had a large value of 100 pieces in the cross-cut peeling test (2), and the dimensional change rate (1) in the gasoline immersion test and the mass change rate in the single-side immersion test. (4)
Also, the results exceeded the values of Examples 1 to 4. Further, in Comparative Example 1, the coating layer of the fluorine-based coating material was peeled off in the elongation test (5).

In Comparative Example 2, the dimensional change rate (1) in the gasoline immersion test exceeded the values of Examples 1 to 4 by 3.6 to 4.1%. Comparative Example 2
In the corrosion resistance test (3), red rust occurred. Further, in Comparative Example 2, the change in mass in the single-side immersion test (4) was 355 to 375 (g / g) in the values of Examples 1 to 4.
m ² ).

In Comparative Example 3, countless cracks occurred in the elongation test (5). In Comparative Example 3, many cracks had already been generated in the extension test before immersion in fuel oil-C.

In Comparative Example 4, partial rust occurred in the cross-cut peeling test (2). In Comparative Example 4, in the elongation test (5), peeling of the coating layer of the fluorine-based coating material occurred.

From the above test results, the products of Examples 1 to 4 to which the present embodiment is applied have lower adhesiveness to the cylindrical body 16 and corrosion resistance than the products of Comparative Examples 1 to 4. It turns out that it is excellent.

The excellent corrosion resistance indicates that the fluorine resin component, which is a non-adhesive component, precipitates on the coating surface, and prevents the flange-side joining surface 7 and the joining surface 5 from sticking to the metal surface of the engine. .

Therefore, according to the present embodiment, the fuel in the air-fuel mixture can be prevented from adhering and staying on the inner peripheral surface 9 of the cylindrical body 16 due to the oil repellency of the coating layer 17. Since the coating layer 17 can be prevented from being damaged by the flexibility of the fluororubber contained in the cylinder 17, swelling of the cylinder 16 by fuel can be effectively suppressed. Along with this, it is possible to prevent the joining surface 5 and the flange-side joining surface 7 from sticking to the metal surface of the engine.

Further, since the adhesion between the cylinder 16 and the coating layer 17 can be improved by the primer treatment layer 18, the swelling of the cylinder 16 can be more suitably suppressed.

Further, since the cylindrical body 16 is formed of inexpensive hydrin rubber, the manufacturing cost can be reduced.

The present invention is not limited to the above embodiment, but can be variously modified as needed.

[0061]

As described above, according to the manifold according to the first aspect of the present invention, the flexibility of the fluorine rubber contained in the fluorine-based coating material prevents the coating layer from being damaged, and the surface of the coating layer can be prevented from being damaged. By preventing the mixture from adhering to the cylinder by the oil repellency of the precipitated fluororesin, swelling of the cylinder by the mixture can be effectively prevented. And the combustion efficiency of the engine can be improved, and the coating layer can prevent corrosion of the metal surface of the engine by the rubber material.

According to the second aspect of the present invention, the adhesion between the coating layer and the cylindrical body can be improved via the primer-treated layer, and the vibration and shock absorption due to the fluorine rubber contained in the coating layer can be reduced. Since it can exhibit more effectively, in addition to the effect of the manifold according to the first aspect, it is possible to more effectively prevent the rubber material constituting the cylindrical body from swelling due to the air-fuel mixture.

According to the manifold according to the third aspect, in addition to the effects of the manifold according to the first or second aspect, the manifold has balanced fuel oil resistance, cold resistance, heat resistance, etc., and also has ozone resistance and vibration resistance. A manifold having excellent fatigue properties can be manufactured, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a manifold according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 viewed from the front in the embodiment of the manifold according to the present invention.

FIG. 3 is a cross-sectional view of the embodiment of the manifold according to the present invention when FIG. 1 is viewed from the right side.

FIG. 4 is an enlarged view of a flange portion in the embodiment of the manifold according to the present invention.

FIG. 5 is a plan view showing an embodiment of the manifold according to the present invention.

FIG. 6 is a bottom view showing the embodiment of the manifold according to the present invention.

FIG. 7 is a diagram showing a test state in the embodiment of the manifold according to the present invention.

FIG. 8 is a diagram showing a conventional manifold.

FIG. 9 is a diagram showing a connection state between a carburetor and an engine using a manifold.

[Explanation of symbols]

 Reference Signs List 1 engine 2 carburetor 4 cylinder 5 joint surface 7 flange side joint surface 9 inner peripheral surface 11 insertion cylinder 15 manifold 16 cylinder 17 coating layer 18 primer treatment layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02M 17/34 F02M 17/34 C (72) Inventor Keiichiro Toyosaka 3-30-1 Horikiri, Katsushika-ku, Tokyo No. F-term in Arai Seisakusho Co., Ltd. (reference) 4J038 CD091 CD092 NA03 NA04 NA12 PB06 PC07

Claims (3)

[Claims] 1. A cylindrical body made of a rubber material having a joint surface with an engine formed at one end surface, and a flange on the same plane as the joint surface is provided on an outer periphery of the joint surface side end of the cylindrical body. A flange having a joint surface is formed, and an insertion tube for inserting an air supply unit of a carburetor is formed at the other end of the cylinder facing the joint surface side end, and at least an inner peripheral surface of the cylinder. A manifold in which a coating layer made of a fluorine-based coating material is formed on the bonding surface and the flange-side bonding surface, wherein the fluorine-based coating material contains a fluorine rubber and a fluorine resin. 2. The manifold according to claim 1, wherein a primer-treated layer with an aminosilane compound is formed below the coating layer. 3. The manifold according to claim 1, wherein the cylinder is made of hydrin rubber.