JP3513425B2 - Manifold - Google Patents

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 a joint surface with an engine formed on one end surface thereof, and the cylinder body is joined. A flange having a joint surface on the same side as the joint surface is formed on the outer periphery of the end portion on the surface side, and the other end portion of the cylindrical body facing the end portion on the joint surface side is provided with a carburetor supply air. The present invention relates to a manifold in which an insertion cylinder for inserting a portion is formed, and a coating layer of a fluorine-based coating material is formed on at least the inner peripheral surface of the cylinder, the joint surface, and the flange-side joint 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 cylindrical body 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 portion of the joint surface 5. There is.

A metal or resin flange 8 having a flange-side joint surface 7 that is 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.
Joining holes 10 for joining the flange 8 to the engine 1 via bolts or the like are formed at four corners of the flange 8.

At the other end of the cylindrical body 4 facing the end on the joint 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 through the joint surface 5 and the flange side joint surface 7, and the insertion tube 11 is inserted. The engine 1 and the carburetor 2 are connected to each other by fixing the air supply unit 2a of the carburetor 2 to the insertion cylinder 11 with a band in a state where the air supply unit 2a is inserted into the carburetor 2. Then, a mixture of fuel and air is supplied from the carburetor 2 into the engine 1 in a state where the engine 1 and the carburetor 2 are connected by the manifold 3.

[0007] In this way,
Hold 3 is mostly made of nitrile rubber or hydrid
It was formed of a single rubber.

However, the manifold 3 is used in a fuel system for motorcycles, outboard motors for ships, etc., and is generally a general-purpose fuel oil resistant rubber material such as hydrin rubber, nitrile rubber, or nitrile / vinyl chloride blend rubber. However, these rubbers have a higher degree of swelling with respect to fuel oil than fluororubbers and lack dimensional stability, so they are not suitable for the initial performance and durability of the engine. Differences may occur and affect combustion efficiency.

Although it is possible to use a fluororubber having fuel oil resistance alone, in this case, the material price is high,
There is a problem 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 joint surface 5 of the cylindrical body 4 and on the flange side joint surface 7 is also proposed. It had been.

By using the manifold 3 in which the coating layer 13 made of the fluorine-based resin material is formed, the fuel in the air-fuel mixture permeates the cylinder 4 and the cylinder 4 swells. It has been said that the air-fuel mixture can be appropriately supplied from the vaporizer 2 to the engine 1 since the above can be prevented and the dimensional stability can be improved.

[0012]

However, in the conventional manifold 3, the adhesiveness between the coating layer 13 made of the fluororesin material and the tubular body 4 made of a rubber material is poor in the atmosphere of fuel oil. However, it was not practical because blisters and adhesive peeling were likely to occur on the coating surface.

Further, since the coating layer 13 made of the fluororesin material was poor in flexibility, the coating layer 13 was easily damaged by vibration or impact applied to the cylindrical body 4.

Therefore, 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, so that the combustion efficiency of the engine is improved. There was a problem that it could not be done.

Further, hydrin rubber as a material of the manifold 3 has a metal corrosive property and thus has a drawback that it corrodes a metal surface of an engine, and nitrile rubber has a disadvantage that ozone resistance is poor. Have

The present invention has been made in view of the above problems, and suppresses the swelling of the rubber material forming the cylindrical body due to the fuel in the air-fuel mixture, and appropriately supplies the air-fuel mixture from the vaporizer to the engine. It is possible to reduce the gap between the initial performance and the durability performance of the engine to improve the combustion efficiency of the engine, and to provide a manifold that can suppress the corrosion of the metal surface of the engine due to hydrin rubber. To do.

[0017]

In order to achieve the above object, the feature of the manifold according to claim 1 of the present invention resides in that the fluorine-based coating material contains fluororubber and fluororesin.

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

A feature of the manifold according to claim 2 is that a primer treatment layer made of an aminosilane compound is formed below the coating layer in claim 1.

By adopting such a structure, it is possible to improve the adhesiveness between the cylinder and the coating layer through the primer treatment layer, so that the inner circumference of the cylinder formed by the coating layer can be improved. It is possible to stably maintain the coating state of the surface, the joint surface, and the flange-side joint surface.

A characteristic of the manifold according to claim 3 is that in the claim 1 or 2, the cylindrical body is made of hydrin rubber.

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

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a manifold according to the present invention will be described below with reference to FIGS.

Incidentally, the same reference numerals are given to the parts which are not different in the basic structure from the conventional manifold 3.

As shown in FIG. 1, the manifold 15 in this embodiment is a thick-walled cylinder 1 made of hydrin rubber.
Have six. 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 the engine 1 and the joint surface 5 are formed on the outer edge of the joint surface 5. A plurality of annular projections 6 shown in FIG. 4 for maintaining the airtightness with respect to are formed.

A metal or resin flange 8 having a flange-side joint surface 7 that is 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. There is. Joining holes 10 shown in FIGS. 5 and 6 for joining the flange 8 to the engine 1 via bolts or the like are formed at four corners of the flange 8.

An insertion cylinder 11 for inserting the air supply portion 2a of the carburetor 2 is formed at the other end of the cylindrical body 16 facing the end on the joint surface 5 side.

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 the fuel contained in the mixture flowing in the cylinder 16.

In the present embodiment, the fluorine-based coating material contains fluororubber and fluororesin.

Below the coating layer 17 of the fluorine-based coating material, good adhesion of the fluorine-based coating material to the inner peripheral surface 9 and the joint surface 5 of the cylindrical body 16 and the flange-side joint surface 7 is provided. A primer treatment layer 18 made of an aminosilane compound is formed.

Next, the operation of this embodiment will be described.

When the manifold 15 of this embodiment is used, the manifold 15 is joined to the engine 1 through the joint surface 5 and the flange side joint surface 7 and vaporized in the insertion cylinder 11 as in the conventional case. With the air supply part 2a of the container 2 inserted, this air supply part 2a and the insertion tube 11
By fixing and with a band, the carburetor 2 and the engine 1 are connected via the manifold 15.

Then, the air-fuel mixture is supplied from the vaporizer 2 to the engine 1 in a state where the vaporizer 2 and the engine 1 are connected via the manifold 15.

The air-fuel mixture supplied from the carburetor 2 flows to the engine 1 side through the inner peripheral surface 9 of the cylindrical body 16.
At this time, a coating layer 17 made of the fluorine-based coating material containing fluororubber and fluororesin is formed on the inner peripheral surface 9 and the joint surface 5 of the cylindrical body 16 and the flange-side joint surface 7. Therefore, the fuel in the air-fuel mixture is prevented from adhering to 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. In addition, since the fluorine-based coating material contains flexible fluororubber 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 is cracked or cracked. No damage will occur. Therefore, the swelling of the cylindrical body 16 due to the air-fuel mixture can be suppressed, and the dimensional stability of the manifold 15 can be improved for a long period of time.

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

Further, since the primer treatment layer 18 made of an aminosilane compound is formed below the coating layer 17, the coating layer 17 is formed in the cylindrical body 1.
It is difficult to peel off from 6.

Further, since the tubular body 16 is made of hydrin rubber having a certain flexibility, the adhesiveness between the tubular body 16 and the coating layer 17 is maintained well.

Next, the manifold 1 according to the present embodiment.
The evaluation test performed in 5 will be described.

The manifolds used in this test are the eight products shown in Table 1 as Examples 1 to 4 and Comparative Examples 1 to 4.

In order to manufacture the products of Examples 1 to 4, first, each hydrin rubber (Zeklon 100) shown in Table 1 was prepared.
0 (CO), Zekron 2000 (ECO), epichromer C (ECO) and Zekron 3100 (GECO))
Are kneaded with an open roll or an intensive mixer, and the kneaded hydrin rubber is subjected to compression molding or injection molding using each composition for crosslinking to obtain a vulcanized product. Then, after degreasing the sample surface of the vulcanized product, 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 treatment 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 treatment layer 18 and dried to 100 to 200.
The coating layer 17 is formed by heat treatment at 5 ° C. for about 5 minutes to 2 hours.

As the fluorine-based coating material, for example, a commercially available product, manufactured by Daikin Industries, Ltd., and the Daier latex series can be used. That is, either DAIEL LATEX GLS (aqueous type) or DAIEL LATEX DPS (solvent series) may be used.
These fluorine-based coating materials are paints in which 5 parts of DAIEL LATEX GLS213-B liquid (curing agent) are mixed with 100 parts of DAIEL LATEX GLS213-A liquid (main agent) as a compounding agent.

As the silane-based primer,
γ-aminopropyltriethoxysilane (A1100 /
Nippon Unicar), N-β-amylethyl-γ-aminopropyltrimethoxysilane (SH6020 / Toray Dow Corning 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 aminosilanes such as The coating layer of the fluorine-based coating material had a thickness of 10
Is about 100 μm.

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

In Comparative Example 2, the primer treatment layer 18 was used.
This is a product in which neither the coating layer 17 nor the coating layer 17 is formed.

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

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

Then, the following tests were carried out on each of 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 through the joint surface 5 and the flange side joint surface 7, and through the insertion tube 11. Product and vaporizer 2
JIS and K625 in a state where and are fixed by the clamp 14.
Test fuel oil-C (isooctane / toluene =
50/50) at half the volume of the product, 70 at room temperature
After immersion in time, the dimensional change rate in the range A of FIG. 3 was measured. (2) Cross-cut peel test After immersing the product in fuel oil for 70 hours, the coating on the flat part (flange side joint surface 7) of the flange 8 coated with the coating film is cut with a sharp blade to reach the substrate 1 mm Make 100 grids, stick cellophane tape on the grid, press strongly with your finger, and immediately peel it off to check the number of peeled pieces. (3) Corrosion resistance of gasoline immersion test In the test of (1) above, a test piece made of a steel plate (S45C) was polished and degreased with No. 400 sandpaper and mounted on the mating mounting jig on the flange 8 of the product, The corrosion resistance was investigated. (4) Single-sided immersion test This was based on the single-sided immersion test method specified in JIS-K6258. The test pieces were each of the rubber-blended compositions shown in Table 1 and had a thickness of 2
After preparing a millimeter vulcanized sheet and treating it with a coating film, the test piece was adjusted and mounted on a single-sided dipping device in a direction in which 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 the target liquid. The test measured the mass change after soaking for 70 hours at room temperature. (5) Elongation test Materials prepared in the same manner as in (4) above were punched out with a JIS-3 dumbbell test piece and tested in accordance with the immersion test method shown in JIS-K6258, using the fuel oil-C as the target liquid. I went. The test conditions were such that after immersion for 70 hours at room temperature, they were immediately placed in a tensile tester, and the presence or absence of adhesive delamination was observed by the deviation that occurred between the rubber and the coating film at break extension, and the adhesion state of the coating was investigated.

[0049]

[Table 1]

As shown in Table 1, the primer treatment layer 18
The products of Examples 1 to 4 in which the coating layer 17 made of the fluorine-based coating material containing fluororubber and fluororesin was formed, and the dimensional change rate in the dimensional change test (1) was 1.6 to 2 It became a value of 1%. In the cross-cut peeling test (2), Example 1
Therefore, the number of peeled off of all the products of Example 4 became 0. In the corrosion resistance test (3), all the products of Examples 1 to 4 had no abnormality. Furthermore, the products of Examples 1 to 4 had a mass change of 75 to 95 (g / m ² ) in the single-sided immersion test (4). Further, in the extension test (5), extension peeling did not occur in all the products of Examples 1 to 4.

On the other hand, in Comparative Example 1, the number of peeled pieces was as large as 100 in the cross-cut peeling test (2), and the dimensional change rate (1) in the gasoline dipping test and the mass change rate in the single-sided dipping test. (4)
Also in the above, the results exceeded the values of Examples 1 to 4. Further, in Comparative Example 1, peeling of the coating layer of the fluorine-based coating material occurred in the elongation test (5).

In Comparative Example 2, the dimensional change rate (1) in the gasoline soaking test exceeded the values of Examples 1 to 4 by 3.6 to 4.1%. In addition, Comparative Example 2
Caused red rust in the corrosion resistance test (3). Further, in Comparative Example 2, the change in mass in the single-sided immersion test (4) is the same as those in Examples 1 to 4 of 355 to 375 (g / g).
m ² ).

In Comparative Example 3, numerous cracks were generated in the elongation test (5). In Comparative Example 3, a large number of cracks were already 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). Further, in Comparative Example 4, peeling of the coating layer of the fluorine-based coating material occurred in the elongation test (5).

From the above test results, the products of Examples 1 to 4 to which the present embodiment is applied are superior to the products of Comparative Examples 1 to 4 in the adhesiveness to the cylindrical body 16 and the corrosion resistance. It turns out to be excellent.

It can be said that the excellent corrosion resistance prevents the fluororesin component, which is a non-adhesive component, from depositing on the coating surface and prevents the flange side joint surface 7 and the joint surface 5 from being fixed to the engine metal surface. .

Therefore, according to this embodiment, the oil repellency of the coating layer 17 can prevent the fuel in the air-fuel mixture from adhering to and staying on the inner peripheral surface 9 of the cylindrical body 16, and the coating layer Since the coating layer 17 can be prevented from being damaged by the flexibility of the fluororubber contained in 17, the swelling of the cylindrical body 16 due to the 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.

Since the primer layer 18 can improve the adhesion between the cylindrical body 16 and the coating layer 17, the swelling of the cylindrical body 16 can be suppressed more preferably.

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

The present invention is not limited to the above-mentioned embodiment, but various modifications can be made as necessary.

[0061]

As described above, according to the manifold of the first aspect of the present invention, the flexibility of the fluororubber component contained in the fluorine-based coating material prevents the coating layer from being damaged, and the surface of the coating layer is protected. The oil repellency of the precipitated fluororesin prevents the mixture from adhering to and staying in the cylinder, effectively preventing the cylinder from swelling due to the mixture. In addition, the combustion efficiency of the engine can be improved, and the coating layer can prevent the metal surface of the engine from being corroded by the rubber material.

According to the manifold of the second aspect, it is possible to improve the adhesiveness between the coating layer and the cylindrical body through the primer treatment layer, and the vibration / shock absorption due to the fluororubber component contained in the coating layer. Since it can be more effectively exhibited, in addition to the effect of the manifold according to the first aspect, it is possible to more effectively prevent the rubber material forming the cylindrical body from swelling due to the air-fuel mixture.

According to the manifold of the third aspect, in addition to the effect of the manifold of the first aspect or the second aspect, it has balanced fuel oil resistance, cold resistance, heat resistance, etc., and also has ozone resistance and vibration resistance. It is possible to manufacture a manifold having excellent fatigue resistance and further reduce manufacturing cost.

[Brief description of 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 as viewed from the front, in an embodiment of a manifold according to the present invention.

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

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 a manifold according to the present invention.

FIG. 6 is a bottom view showing an embodiment of a 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 by a manifold.

[Explanation of symbols]

1 engine 2 vaporizer 4 cylinder 5 Bonding surface 7 Flange side joint surface 9 Inner surface 11 insertion tube 15 manifold 16 cylinder 17 coating layer 18 Primer layer

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP 10-315361 (JP, A) JP 9-144955 (JP, A) JP 61-28751 (JP, A) JP 61- 142357 (JP, A) JP 61-164061 (JP, A) Actual development 60-124568 (JP, U) Actual development 61-183457 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02M 35/10 F02M 17/34

Claims (3)

(57) [Claims] 1. A cylinder made of a rubber material having a joint surface formed with an engine is provided on one end surface, and a flange side that is flush with the joint surface is provided on the outer periphery of the joint surface side end portion of the cylinder body. A flange having a joint surface is formed, and an insertion cylinder for inserting the air supply portion of the carburetor is formed at the other end portion of the cylinder body facing the joint surface side end portion, and at least the inner peripheral surface of the cylinder body. A manifold in which a coating layer made of a fluorine-based coating material is formed on the joint surface and the flange-side joint surface, wherein the fluorine-based coating material contains a fluororubber and a fluororesin. 2. The manifold according to claim 1, wherein a primer treatment layer made of an aminosilane compound is formed below the coating layer. 3. The manifold according to claim 1, wherein the tubular body is made of hydrin rubber.