JPH0612200Y2 - Reed valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a reed valve, and more particularly to a reed valve having improved flame resistance.

[Prior art and its problems]

Generally, a resin-based reed is used for a two-cycle engine reed valve from the viewpoint of operation response and the like.

The resin-based lead is formed into a cloth shape by plain weaving or satin weaving of glass fiber, carbon fiber, etc., and is impregnated with epoxy resin, imide resin, etc. to obtain a prepreg, and then a plurality of prepregs are laminated. Heat and pressurize it into a plate,
It is manufactured by punching into a predetermined shape.

FIG. 7 shows a reed valve 72 using the resin-based reeds 66 and 67 shown above.

That is, in the reed valve 72 shown in FIG. 7, communication holes 64 and 65 that serve as fluid flow paths are provided in the inclined surface of the case complete 63 formed in a V shape, and the communication holes 64 and 6 are provided.
5, resin leads 66 and 67 for closing the communication holes 64 and 65 and SPCC or the like are formed on the outside of the lead 6.
The stoppers 68 and 69 for limiting the opening angles of 6 and 67 are attached by screws 70 and 71.

In the intake passage provided with the reed valve 72,
When the piston rises from the bottom dead center, the air-fuel mixture flows from the carburetor in response to the negative pressure in the crankcase, the leads 66 and 67 are pushed and opened by the air-fuel mixture, and the air-fuel mixture passes through the communication holes 64 and 65. Flow into the crankcase.

Next, when the piston starts descending and the air-fuel mixture sucked into the crankcase is pressurized and tries to flow backward in the direction of the carburetor, the leads 66 and 67 are pushed and closed by the air-fuel mixture, and the air-fuel mixture flows backward. Will be blocked.

Then, the reed valve 72 repeats the operation as described above.

However, especially in a two-cycle engine for an outboard motor, the ignition timing may be delayed during the idling in order to make the operation efficient and smooth. In this case, the combustion continues until the intake stroke, and the combustion is blown back to the intake system. The backfire phenomenon may occur.

Then, due to this backfire phenomenon, the temperature in the vicinity of the intake passage becomes high, the resin-based lead portion of the reed valve is heated, and a part of it is melted or burned by a flame, and the prepreg laminate is peeled off, and the lead is There was a problem of damage.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional one, and an object of the present invention is to provide a reed valve having excellent flame resistance in which the reeds are not burned even by the backfire phenomenon.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is provided in an intake passage that communicates between a carburetor and a crankcase, opens and closes the intake passage according to a pressure difference, and flows the air-fuel mixture in the intake passage. A reed valve having a reed for controlling the reed, which employs a means in which a wire mesh for covering the reed is provided on the downstream side of the intake passage so as not to obstruct the opening and closing of the reed.

[Action]

By adopting the above-described structure, the present invention has excellent flame resistance without burning the leads even by the backfire phenomenon.

〔Example〕

FIG. 1 shows a reed valve 1 according to the present invention. The reed valve 1 has a communication hole 3 which serves as a fluid flow path on an inclined surface of a case complete 2 formed in a V shape.
4 is provided, and resin leads 5 and 6 for closing the communication holes 3 and 4 are provided outside the communication holes 3 and 4, and a stopper 7 formed of SPCC or the like for limiting the opening angle of the leads 5 and 6. 8 and a wire mesh 9 that covers the leads 5 and 6 and the stoppers 7 and 8 so as not to hinder the movement of the leads 5 and 6 with a screw 1
It is configured by being attached by 0 and 11.

In the reed valve 1 configured as described above, when the reed valve 1 is provided in the intake passage that communicates between the carburetor and the crankcase, the resin reeds 5 and 6 are covered with the wire net 9 on the downstream side of the intake passage. Therefore, even if the backfire phenomenon occurs and the flame is blown back toward the reed valve 1, the flame is blocked by the wire net 9 covering the resin reeds 5 and 6, and the heat is taken away, so that the straight line Lost sex
The leads 5 and 6 are never reached.

Therefore, the resin-made leads 5, 6 of the reed valve 1
Is protected from the flame due to the backfire phenomenon, is not burned by the flame, and has excellent flame resistance.

Further, FIGS. 2 to 6 show another embodiment according to the present invention.

That is, in the reed valve 12 shown in FIG. 2, communication holes 19 and 20 that serve as fluid flow channels are provided on the inclined surface of the case complete 13 formed in a V shape, and the communication holes 19 and 2 are provided.
0, which is made of resin leads 14 and 15 for closing the communication holes 19 and 20 and SPCC or the like.
The stoppers 16 and 17 for limiting the opening angles of 4 and 15 are attached by screws 21 and 22, and the leads 14 and 15 are attached to the top 13a of the case complete 13 so as not to hinder the movement of the leads 14 and 15. A plate-shaped wire mesh 18 is attached so as to cover it.

Also in this case, as in the case shown in FIG. 1, the resin leads 14 and 15 of the reed valve 12 are protected from the flame due to the backfire phenomenon by the wire mesh 18 attached to the top 13a of the case complete 13. As a result, it will not be burned by the flame and will have excellent flame resistance.

The reed valve 23 shown in FIG. 3 is provided with communication holes 25 and 26, which are fluid passages, on the inclined surface of a case-complete 24 formed in a V shape, and the communication holes 25 and 26 are provided outside the communication holes 25 and 26. Resin leads 27, 28 for closing 26
And a wire net 20 that covers the resin leads 27 and 28 so as not to hinder their movement by screws 30 and 31. The leads 27 of the wire net 20 are
The surface facing 28 is bent to match the opening angle of the leads in order to serve as a stopper that limits the opening angle of the leads 27, 28, so it is necessary to provide a stopper formed of SPCC or the like. The configuration as a reed valve can be simplified.

Also in this case, as in the case shown in FIG. 1, the resin leads 27 and 28 of the reed valve 23 are protected from the flame due to the backfire phenomenon by the wire net 20 and burned by the flame. No matter what, the flame resistance will be excellent.

The reed valve 32 shown in FIG. 4 has the same structure as that of the reed valve 1 shown in FIG. 1, but the wire net 40 is fixed by screws 41, 42, and also fixed by the top 33a of the case complete 33. Thus, when the resin leads 36, 37 are opened and the fluid flows, the wire net 40 is prevented from vibrating due to the fluid flow.

Then, like the one shown in FIG. 1, the resin leads 36 and 37 of the reed valve 32 are protected from the flame due to the backfire phenomenon by the wire netting 40, are not burned by the flame, and have flame resistance. It will be excellent.

The reed valve 43 shown in FIG. 5 has the same structure as that shown in FIG. 3, but the wire net 49 has screws 50, 51.
And the leads 46, 48 made of resin, which are also fixed at the top 46a of the case complete 46.
When the opening opens and the fluid flows, the wire mesh 4
9 is prevented from vibrating.

Then, like the one shown in FIG. 3, the resin-made leads 47 and 48 of the reed valve 43 are protected from the flame due to the backfire phenomenon by the wire netting 49, so that they are not burned by the flame. It has excellent flame resistance.

Further, although FIG. 6 shows a flat type reed valve 62, in this case as well, by providing the wire mesh 61 as in the embodiment shown in FIGS. 1 to 5, the flame due to the backfire phenomenon is provided. It is also protected from flames, is not burned by flames, and has excellent flame resistance.

In the embodiment shown in FIGS. 1 to 6, the reed valve is protected by the plate-shaped wire mesh, but the invention is not limited to this and may be a corrugated wire mesh, a sawtooth wire mesh, or the like.

Furthermore, the number of wire meshes that protect the reed valve is not limited to one, and a plurality of wire meshes may be used.

Further, the material of the wire mesh, the size and shape of the mesh, the diameter, the thickness, etc. are not particularly limited as long as they block the flame.

[Effect of device]

The present invention is configured as described above, and the reed is covered with a wire mesh so as not to obstruct the movement of the reed at the downstream side of the intake passage that communicates between the carburetor and the crankcase. However, the flame is blocked by the wire mesh, the heat is taken away, the linearity is lost, and it does not reach the lead. Therefore, burnout due to the flame of the lead can be completely prevented, and the flame resistance of the lead can be greatly improved. Further, since the movement of the reed is not hindered by the wire net, it has an excellent effect that the function as a reed valve can be sufficiently exhibited.

[Brief description of drawings]

FIG. 1 is a sectional view showing a reed valve of the present invention, FIG.
FIGS. 3, 4, 5, and 6 are sectional views showing another embodiment of the reed valve according to the present invention, and FIG. 7 is a sectional view showing a conventional reed valve. 1, 12, 23, 32, 43, 62, 72 ... Reed valve 2, 13, 24, 33, 46, 56, 63 ... Case complete 3, 4, 19, 20, 25, 26, 34, 35, 44, 45, 58, 64, 65 ... Communication holes 5, 6, 14, 15, 27, 28, 36, 37, 47, 48, 55, 66, 67 ... Leads 7, 8, 16, 17, 38 , 39, 59, 68, 69 ... Stoppers 9, 18, 29, 40, 49, 61 ... Wire mesh 10, 11, 21, 22, 30, 31, 41, 42, 50, 51, 60, 70, 71 ...... Screws 13a, 33a ...... Top 57 ...... Seat member

Claims (1)

[Scope of utility model registration request] 1. A reed valve provided in an intake passage communicating between a carburetor and a crankcase, the reed valve having a reed for opening / closing the intake passage according to a pressure difference to control a flow of an air-fuel mixture flowing in the intake passage. The reed valve is characterized in that a wire mesh is provided downstream of the intake passage so as to cover the reed so as not to prevent the reed from opening and closing.