JPH06323449A - Reed valve - Google Patents

Abstract

PURPOSE:To prevent lowering of performance and service life of read valve caused by deformation occurring at manufacturing or using. CONSTITUTION:In a read valve 1A made of a fiber reinforced resin member composed of a reinforced fiber 12 and a thermoplastic resin 13, a plurality of sheets of the reinforced fiber impregnated the thermoplastic resin as matrix are overlapped by shifting its fiber direction by 30 deg.-40 deg.. In the read valve1A made of the fiber reinforced resin member composed of the reinforced fiber and the thermoplastic resin, the reed valve 1A is bent so that the sitting surface side becomes recessed by making the thickness of the sitting surface side of a layer formed by the thermoplastic resin 13 to become a matrix larger than that of non-sitting surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reed valve made of a fiber reinforced resin material composed of a reinforced fiber and a thermoplastic resin.

[0002]

2. Description of the Related Art In a reed valve made of a fiber-reinforced resin material containing fibers having high strength and high elastic modulus as reinforcing fibers, a sheet of reinforcing fibers is impregnated with a matrix of thermoplastic resin as the fiber-reinforced resin material. Although what has been conventionally proposed, in the case of using such a fiber reinforced resin material, the thermoplastic resin generally has a larger elongation at break than the thermosetting resin and is superior in toughness. It is considered to be more durable than the one using a curable resin as a matrix.

In such a reed valve made of a fiber reinforced resin material comprising a matrix of reinforced fibers and a thermoplastic resin, a woven fabric is formed by the fibers of the thermoplastic resin serving as the matrix and the reinforced fibers, and a plurality of the woven fabrics are stacked. BACKGROUND ART There is conventionally known a technique in which fibers of a thermoplastic resin are melted by hot pressing to form a plate body of a fiber-reinforced resin, and the plate body is punched or laser-processed to manufacture a reed valve. (JP-A-3-227
(Publication No. 207)

Incidentally, in the conventional reed valve formed of the fiber reinforced resin material as described above, its material characteristics can be most effectively exerted with respect to the necessity of strength and rigidity against bending when the reed valve is opened and closed. As described above, the fiber directions in the reinforcing fiber sheet are set to be 0 ° and 90 ° along the bending direction of the reed valve.

[0005]

By the way, in the reed valve, when the engine is used, the flow velocity of the vaporized fuel is not uniform in the intake manifold, so that the pressure applied to the reed valve by the flow of the vaporized fuel is not constant. , The reed valve opens due to the twisting phenomenon, and then
Although the reed valve closes with the primary compression in the engine, the reed valve sometimes sits on the valve seat while twisting.

When the reed valve comes into contact with the valve seat in such a twisted state, a shock stress is intensively applied to the tip corner portion of the reed valve, and this concentrated shock stress causes the shock from the tip corner portion of the reed valve. The problem of cracking occurs.

In manufacturing a reed valve, the reed valve may be deformed such as warped or twisted after being molded from a fiber reinforced resin material, and the deformed direction is not constant. When assembled to the seat, a gap may be created between the reed valve and the valve seat when the reed valve is closed.

Therefore, when the piston starts descending and the crank chamber becomes a positive pressure and the air-fuel mixture tries to escape to the reed valve, the reed valve is temporarily opened and the air-fuel mixture is blown back to the carburetor, and Along with the deterioration of performance, the seating of the reed valve on the valve seat becomes non-uniform, and impact stress is concentrated on a part of the seat, which shortens the life of the reed valve.

An object of the present invention is to eliminate the above-mentioned disadvantages of the conventional reed valve, and more specifically, the reed valve of the reed valve caused by the above-mentioned deformation during manufacturing or use. The purpose is to prevent deterioration of performance and life.

[0010]

In order to solve the above-mentioned problems and to achieve the object, the present invention provides a reed valve formed of a fiber reinforced resin material comprising a reinforced fiber and a thermoplastic resin. A reinforcing fiber sheet impregnated with a resin as a matrix is arranged at a fiber direction of 30 ° to 4 °.
It is characterized in that a plurality of sheets are overlapped with each other by shifting by 5 °.

Further, in a reed valve formed of a fiber reinforced resin material composed of reinforcing fibers and a thermoplastic resin, the thickness of the layer formed of the thermoplastic resin serving as the matrix on the seating surface side is the same as that on the non-seating surface side. It is characterized in that the reed valve is bent so that the seating surface side becomes concave by making the thickness larger than the thickness.

[0012]

[Working] Reinforcement fiber sheet with its fiber direction 30 ° ~
By stacking them by shifting them by 45 °, the required strength and rigidity can be obtained by the seats in the fiber directions of 0 ° and 90 ° with respect to the bending direction of the reed valve, and the fiber direction of 30 ° to 45 ° is Generation of cracks and propagation of cracks are prevented by the displaced sheets, and twisting of the reed valve is suppressed by superimposing sheets having different fiber directions, so that the performance is stable.

Further, by forming one surface of the surface layer formed of the thermoplastic resin serving as a matrix thicker than the other surface, the molding shrinkage of the resin surface layer having a larger thickness becomes larger. After manufacturing, the fiber-reinforced resin plate material is curved in a certain direction such that the thicker resin layer is concave.

Then, when the reed valve manufactured by cutting the fiber reinforced resin plate material curved in a certain direction is attached so that the concave surface thereof faces the valve seat side, the reed valve is attached to the reed valve itself. Due to its rigidity, it is pressed against the valve seat, there is no gap between the reed valve and the valve seat, the reed valve is pressed by the stopper, and it sits evenly on the valve seat, and concentrated load is applied to part of it. Never.

Moreover, since the thermoplastic resin layer on the seating surface side is thick, a cushioning action is generated by the thermoplastic resin layer when the reed valve is opened and closed, and the impact noise between the reed valve and the valve seat is reduced. Further, the flexibility of the surface on the seating surface side is increased, and the airtightness during seating between the reed valve and the valve seat is effectively maintained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The reed valve of the present invention will be described below with reference to the accompanying drawings.

1 to 3 show a first embodiment of a reed valve according to the present invention. A reed valve 1A comprises a reinforcing fiber 12 such as carbon fiber, glass fiber or organic fiber, polyamide, polyphenylene sulfide, It is composed of a matrix of a thermoplastic resin 13 such as polyetheretherketone, and is manufactured using a fiber reinforced resin plate 11A as shown in FIG.

For the fiber reinforced resin plate 11A which is a material for manufacturing the reed valve 1A, the reinforced fiber 12 is used.
As the thermoplastic resin 13 used as a matrix, for example, in the case of polyamide, in the case of general injection, Molecular weight is 1
3000, for fibers, the molecular weight of about 30,000 is used, while the molecular weight is 24,000.
As shown in FIG. 3, a laminate of cloth fabric is formed so as to be embedded in a matrix of the thermoplastic resin 13, as shown in FIG.

In the fiber reinforced resin plate 11A, the woven fabric of reinforcing fibers embedded in the matrix of the thermoplastic resin 13 has a fiber direction of 0 ° with respect to the bending direction of the reed valve, as shown in FIG. 12A with 90 °
And 12B in which the fiber direction is deviated by 30 ° to 45 ° with respect to this, and 12A-12B-12A are stacked in this order from the top.

In the reed valve 1A formed by such a fiber reinforced resin plate body 11A, 0 is set in the bending direction.
The cloth fabric with the fiber directions of 90 ° and 90 ° provides the strength and rigidity required for the reed valve, and the cloth fabric with the fiber direction shifted by 30 ° to 45 ° against it causes cracks at the tip of the reed valve. The generation and propagation of is prevented, and by superimposing them,
The twist of the reed valve is suppressed.

In the above embodiment, the cloth fabric is laminated in the order of 12A-12B-12A from the top. However, the reed valve is formed by laminating the cloth fabric in the order of 12B-12A-12B from the top. Is also possible. However, in that case, the spring constant of the reed valve is lower than that in the above-described embodiment.

A method of manufacturing the reed valve 1A shown as the first embodiment will be described below with reference to FIGS.

FIGS. 4 to 6 show a process of forming the fiber reinforced resin plate 11A from the thermoplastic resin 13 serving as a matrix and the reinforced fiber cloth fabrics 12A and 12B.
First, as shown in FIG. 4, the thermoplastic resin film 13A
Between the fabrics 12A and 12B from above 13A-12A-1
3A-12B-13A-12A-13A so as to be sandwiched and stacked.

Next, as shown in FIG. 5, the laminate of the thermoplastic resin film 13A having the thickness a and the woven fabrics 12A and 12B is placed on a stand 2 having a mold 21 having a height b as a stopper. The woven fabrics 12A and 12B are impregnated with the thermoplastic resin film 13A while being melted by being pressed while being heated by the heat press machine 3, and the thickness b (b <b < The fiber-reinforced resin plate body 11A of a) is formed.

7 to 10 show a fiber-reinforced resin plate body 11A.
FIG. 8 shows a process of forming the reed valve 1A shown in FIG. 1 from the above. First, as shown in FIG. 7, the reed valve shown in FIG. The strip 10 is formed.

Then, the reed valve-shaped piece 10 is reheated, and as shown in FIG. 9, the reed valve-shaped piece 10 has a slightly larger planar shape than the reed valve-shaped piece 10 and has a depth c.
In the reed valve mold 4 which is smaller than the thickness b of
The reed valve 1A as shown in FIG. 1 is formed by cooling while pressurizing the press machine 5.

The method for manufacturing the first embodiment of the present invention is not limited to the above-mentioned manufacturing method, but by applying the manufacturing method as described above, It is possible to obtain the effect like.

The ratio of the matrix of the reinforcing fibers and the thermoplastic resin can be easily changed by changing the thickness of the thermoplastic resin film and the number of layers to be laminated, and the thickness, direction, weave, etc. of the woven fabric of the reinforcing fibers can be changed. Can be freely changed, and a reed valve having desired characteristics can be easily manufactured.

Since reheating and pressing are performed, the impregnated state of the matrix of the reinforcing fibers and the thermoplastic resin is improved, and bubbles are extruded, so that the strength is increased.

Since the resin of the matrix is extruded to the entire peripheral end portion of the reed valve because it is molded with a large mold at the time of re-pressing, it is possible to eliminate minute cracks in the peripheral portion generated during processing such as punching. It is possible to prevent the reed valve from cracking during use caused by such minute cracks, and also to prevent the cracks caused by this from being exposed to the end portion of the reinforcing fiber.

The manufacturing method itself as described above is not limited to the application to the first embodiment of the present invention.
The present invention is widely applicable to all reed valves manufactured by a fiber-reinforced resin plate body composed of a reinforcing fiber sheet and a thermoplastic resin matrix.

The first embodiment of the reed valve of the present invention has been described above. Next, the second embodiment of the reed valve of the present invention will be described.

In the second embodiment as well, the reed valve is formed of a fiber-reinforced resin plate body in which the reinforcing fibers 12 are embedded in the matrix of the thermoplastic resin 13. The material of the plastic resin 13 is the same as that of the first embodiment, so the description of this point will be omitted.

In the second embodiment, as shown in FIG. 12, in the fiber-reinforced resin plate 11B, the thermoplastic resin layer e on one surface side is more than the thermoplastic resin layer d on the other surface side. Since it is formed thick, the molding shrinkage on the layer d side is small due to the reinforcing effect of the fiber, and the molding shrinkage on the layer e side is small.
Since it is larger than the side, as shown in FIG.
It is slightly curved as a whole so that the layer e side is concave.

By the fiber-reinforced resin plate 11B which is slightly curved as a whole, a thick layer e of the thermoplastic resin is formed.
A reed valve is manufactured in which the warp is always kept in a constant direction so that the side, that is, the concave side, becomes a seating surface for the valve seat.

As shown in FIG. 13 (A), this reed valve 1B is fastened to the valve seat 6 together with the stopper 7 by bolts 8 so that the concave surface becomes the seating surface for the valve seat 6. As a result, the reed valve 1B is not evenly seated on the valve seat 6 and a concentrated load is not applied to a part of the reed valve 1B, and unlike the conventional example shown in FIG. There is no occurrence of a gap between the reed valve 1C and the valve seat 6.

Further, since the thermoplastic resin layer e on the seating surface side is thick, a cushioning effect occurs during seating, the impact noise between the reed valve 1B and the valve seat 6 is reduced, and the seating surface side The flexibility of the surface is increased, and the airtightness between the reed valve 1B and the valve seat 6 when seated can be effectively maintained.

Also in the manufacture of the second embodiment, a fiber-reinforced resin plate is prepared from the laminate of the film-like thermoplastic resin and the woven cloth of reinforcing fibers shown in the manufacturing method of the first embodiment. By applying the step of forming, the thin layer d and the thick layer e of the thermoplastic resin can be easily formed by simply changing the number of the thermoplastic resin films to be stacked.

[0039]

According to the reed valve of the present invention as described above, it is possible to prevent the deterioration of the performance and the life of the valve due to the deformation of the reed valve that occurs during manufacturing or use.

[Brief description of drawings]

FIG. 1A is a plan view showing a first embodiment of a reed valve of the present invention, and FIG. 1B is a partial sectional view taken along the line AA.

FIG. 2 is an explanatory view showing the arrangement and laminated state of the reinforcing fiber cloth fabric in the example shown in FIG.

FIG. 3 is a cross-sectional view showing a fiber-reinforced resin plate body in which a cloth fabric of reinforcing fibers in an arrangement and a laminated state as shown in FIG. 2 is embedded.

4 is a cross-sectional view showing a state in which a thermoplastic resin film and a reinforcing fiber cloth fabric are laminated as a pre-process for manufacturing the fiber-reinforced resin plate shown in FIG.

5 is an explanatory view showing a step of hot pressing a laminate of the thermoplastic resin film and the reinforcing fiber cloth fabric shown in FIG.

FIG. 6 is a perspective view showing a fiber reinforced resin plate body formed by the hot pressing step shown in FIG.

7 is a perspective view showing a punched shape of a reed valve-shaped piece from the fiber-reinforced resin plate body shown in FIG.

FIG. 8A is a plan view showing a reed valve-shaped piece punched out from a fiber-reinforced resin plate, and FIG. 8B is a partial sectional view taken along line BB.

9 is an explanatory view showing a process of forming a reed valve from the reed valve-shaped piece shown in FIG.

10 is a cross-sectional view taken along the line DD of FIG.

FIG. 11 is a partial vertical cross-sectional view showing a fiber-reinforced resin plate body for producing a second embodiment of the reed valve of the present invention.

12] EE of the fiber-reinforced resin plate body shown in FIG.
The partially expanded transverse cross-sectional view along a line.

FIG. 13 is a comparative explanatory view of a reed valve of the present invention mounted on a valve seat of a second example (A) and a conventional example (B).

[Explanation of symbols]

 1A Reed valve 1B Reed valve 11A Fiber reinforced resin material (fiber reinforced resin plate body) 11B Fiber reinforced resin material (fiber reinforced resin plate body) 12 Reinforced fiber 12A Reinforced fiber sheet (cloth fabric) 12B Reinforced fiber sheet (cloth fabric) ) 13 Thermoplastic resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Ishihara 2500 Shinkai, Iwata, Shizuoka Prefecture Yamaha Motor Co., Ltd.

Claims (2)

[Claims] 1. In a reed valve made of a fiber reinforced resin material comprising a reinforced fiber and a thermoplastic resin, a reinforced fiber sheet impregnated with a thermoplastic resin as a matrix has a fiber direction of 30 ° to 45 °. A reed valve characterized in that a plurality of sheets are staggered and stacked. 2. In a reed valve formed of a fiber reinforced resin material composed of reinforcing fibers and a thermoplastic resin, the thickness of the layer formed of the thermoplastic resin serving as the matrix on the seating surface side is the same as that of the non-seating surface side. The reed valve is characterized in that the reed valve is warped so that the seating surface side becomes concave by making it larger than the thickness.