JPH0615200Y2 - Reed valve mounting structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a reed valve mounting structure, and more particularly to a reed valve mounting structure for mounting a reed valve to a fuel intake from a carburetor in various engines.

[Conventional technology]

Generally, in a two-cycle engine or the like, a reed valve device as shown in FIG. 7 and FIG. 8 is provided at a portion for sucking fuel from a carburetor.

The reed valve device 1 has a valve body 2 having a cap body with a substantially triangular cross-section, and a fixing flange 3 protruding outward is formed on a peripheral edge of a lower end portion of the valve body 2. There is. The lower surface of the valve body 2 has an inlet opening 4 for sucking fuel.
, And three outlet openings 5, 5 for discharging fuel are formed in parallel on one side surface of the valve main body 2, and the valve main body 2 is provided with a fuel suction portion by a bolt or the like. It is properly attached to the mount.

Further, on the surface where the outlet openings 5 of the valve body 2 are formed,
A reed valve 6 made of a thin plate-like resin or the like for opening and closing each of the outlet openings 5 is provided. Three open / close movable parts 6 for opening / closing the outlet opening 5
are formed in a substantially E shape by extending a, 6a ... From the base portion 6b. Further, on the outside of the reed valve 6,
A bent metal stopper 7 for restricting the opening of the reed valve 6 from the outside is provided.
The reed valve 6 is sandwiched and fixed to the valve body 2 by a bolt. This stopper 7 is formed in a substantially E shape by extending from the base portion 7b three restraining portions 7a, 7a ... Having a shorter length than the opening / closing movable portion 6a of the reed valve 6, and is formed in a substantially E shape. Around each outlet opening 5, a valve seat 8 made of a rubber cushion or the like that fits well with each open / close movable portion 6a of the reed valve 6 is arranged.

In the conventional reed valve device, during the discharge and suction strokes in which the pressure of the engine suction side is lower than the pressure of the carburetor side, this pressure difference causes each open / close movable part 6a of the reed valve 6 to move outward. It is sucked until it comes into contact with the stopper 7, and moves from the fully closed state shown by the chain line in FIG. 8 to the fully opened state shown by the solid line in FIG. 8, whereby the outlet openings 5 are opened and the inlet openings 4 and Fuel is sucked into the fuel chamber of the engine through the respective outlet openings 5. On the other hand, during the compression, explosion and expansion strokes in which the pressure of the suction part on the engine side becomes higher than the pressure on the carburetor side, the open / close movable parts 6a of the reed valve 6 are changed from the fully opened state shown by the solid line in FIG. Returning to the fully closed state shown by the chain line in the figure, each outlet opening 5
Is fully closed and the fuel supply is stopped.

Further, in the reed valve device 1, when the valve body 2 is fixed to the mount of the fuel intake portion, as shown in FIG. 9, the receiving groove 9 is provided on the lower surface side of the fixing flange 3 of the valve body 2.
A seal member 10 made of an elastic material such as rubber is fixed inside the receiving groove 9 such that the tip of the seal member 10 projects from the lower surface of the fixed flange 3. Further, on both sides of the seal member 10, an escape groove 11 recessed from the lower surface of the fixed flange 3 is formed integrally with the seal member 10.

Then, the fixing flange 3 of the valve body 2 is placed on the mounting surface of the mount 12 of the fuel suction portion and is tightened and fixed by a bolt or the like, so that the seal member 10 is compressed inside the receiving groove 9, Valve body 2 and mount 12
I am trying to fix and.

[Problems to be solved by the device]

However, in the above-mentioned conventional reed valve mounting structure, the relief groove 1 when the seal member 10 is compressed inside the receiving groove 9
Since it is necessary to form 1 on both sides in the width direction of the seal member 10, there is no problem if the width dimension of the fixing flange 3 of the valve body 2 is large, but it is fixed by downsizing of the valve body 2 or the like. When the flange 3 has a small width, the receiving groove 9 cannot have a large width. Therefore, the escape groove 11 cannot be formed in the seal member 10, and the escape groove 11 is forcibly formed. In such a case, a part of the fixed flange 3 may be chipped and the valve body 2 may not be properly attached.
However, there is a problem in that the mount 12 cannot be sealed.

When the escape groove 11 cannot be formed,
Japanese Utility Model Publication 62-87267 and Japanese Utility Model Publication 62-14.
As disclosed in Japanese Patent No. 6059, etc., conventionally, a gasket is provided between the valve main body 2 and the mount 12 for sealing, but if a gasket is used in this way, the number of parts can be increased. Due to this increase, the work of mounting the valve body 2 becomes complicated, and the valve body 2 cannot be mounted quickly.

The present invention has been made in view of these points, and it is possible to easily and reliably seal the valve body and the mount without using a gasket, the number of parts is small, and the assembly is easy. It is an object of the present invention to provide a reed valve mounting structure that is low in cost.

[Means for Solving the Problems] According to the first aspect of the present invention, there is provided a reed valve mounting structure according to the first aspect of the present invention, wherein an inlet opening for fuel and an outlet opening for opening and closing the reed valve are provided. In a reed valve mounting structure in which a peripheral edge of the formed inlet opening of the valve body is hermetically mounted on a mounting surface of a mount of a fuel intake portion, in the entire circumference of an end surface of the peripheral edge portion of the inlet opening of the valve body, A seal member made of an elastic body is integrally formed so as to project, and a seal groove for accommodating the seal member in a close contact state is formed on the mounting surface of the mount. The seal groove is formed so as to be in close contact with a plurality of points in a cross section in a direction orthogonal to the longitudinal direction of the seal groove.

Further, according to the second aspect, the periphery of the inlet opening of the valve body in which the fuel inlet opening and the outlet opening opened and closed by the reed valve are formed is hermetically sealed to the mounting surface of the mount of the fuel intake portion. In the reed valve mounting structure that is mounted as described above, a flat plate-shaped sealing member made of an elastic body is integrally formed on the entire peripheral surface of the peripheral edge of the inlet opening of the valve body, and the sealing surface is mounted on the mounting surface of the mount. It is configured by forming a sealing projection that is brought into close contact with the member so as to bite into it.

[Operation] According to the present invention of claim 1, a state in which the peripheral portion of the inlet opening of the valve body is placed on the mounting surface of the mount, and the seal member of the valve body is housed in the seal groove of the mount. so,
The seal member is tightened so as to be deformed in the seal groove, and the seal member and the seal groove are hermetically fixed so that the seal member and the seal groove are brought into close contact with each other at a plurality of positions in a cross section in a direction orthogonal to the longitudinal direction of the seal groove.

According to the second aspect of the present invention, in a state where the seal protrusion of the mount is in close contact with the seal member of the valve body, the seal protrusion is tightened so that the seal protrusion bites into the seal member, and the seal is fixed. To do.

As described above, in the present invention, since the valve body and the mount are sealed, the relief groove or the like when the seal member is deformed is formed in the peripheral portion of the inlet opening of the valve body in the width direction of the seal member. It is not necessary to form on both sides, and even if the width dimension of the peripheral portion of the inlet opening of the valve body is small, the seal member can be easily formed, and the valve body and the mount can be reliably sealed. Moreover, since it is not necessary to use a gasket or the like, the work for mounting the valve body can be performed easily and quickly.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6 and the same parts as those in FIGS.

1 and 2 show an embodiment of the present invention, in which a reed valve device 1 has a valve body 2 having a substantially triangular cross section.
A fixed flange 3 is formed at the lower end of the valve body 2 at the periphery of the inlet opening 4 so as to project outward. A seal member 10 made of an elastic material such as rubber is integrally formed on the lower surface side of the fixed flange 3 in an annular shape, and the tip of the seal member 10 has a spherical shape in this embodiment. Is formed in. In addition, an annular mount 12 corresponding to the fixed flange 3 of the valve body 2 is disposed in the fuel intake portion, and the seal is provided at a position corresponding to the seal member 10 on the mounting surface of the mount 12. A seal groove 13 having a rectangular cross-section and having a depth dimension shallower than the height dimension of the member 10 is formed in an annular shape.

In this embodiment, as shown in FIG.
The fixing flange 3 of the valve main body 2 is placed on the mounting surface of the valve 2, and the seal member 10 of the fixing flange 3 is accommodated in the seal groove 13 of the mount 12, and is fixed by tightening with a bolt or the like (not shown). As a result, the seal member 10 is brought into close contact with the bottom surface of the seal groove 13 of the mount 12 to seal the valve body 2 and the mount 12.

Therefore, in this embodiment, the fixing groove 3 of the valve body 2 is fitted in the seal groove 13 formed in the mount 12.
By closely contacting the seal member 10 formed on
Since the sealing is performed, the fixing flange 3
It is not necessary to form an escape groove or the like when the seal member 10 is deformed on both sides in the width direction of the seal member 10, and the seal member 10 can be easily formed even when the width dimension of the fixed flange 3 is small. The valve body 2 and the mount 12 can be reliably sealed. Moreover, the valve body 2
Since it is not necessary to provide a gasket between the mount 12 and the mount 12, the valve body 2 can be easily and quickly mounted.

3 and 4 show another embodiment of the present invention, in which the sealing member 10 made of an elastic material such as rubber is integrally formed on the lower surface side of the fixing flange 3 of the valve body 2. The seal member 10 is formed in an annular shape, and the tip end portion of the seal member 10 is formed in a square cross section in this embodiment. In addition, an annular mount 1 arranged in the fuel intake section
A sealing groove 13 having a hemispherical cross section is formed on the mounting surface of No. 2.

Also in this embodiment, similarly to the above embodiment, the seal member 10 formed on the fixing flange 3 of the valve body 2 is housed in the seal groove 13 formed in the mount 12 and is fixed by tightening, thereby fixing the fixing flange. Even if the width dimension of 3 is small, the valve body 2 and the mount 12 can be reliably sealed without using a gasket or the like. Moreover, in this embodiment, as shown in FIG. 4, the seal groove 13 is formed in a spherical shape, and the seal member 10 is formed in a square shape.
Since the two tip corners of the seal member 10 are brought into close contact with the inner surface of the seal groove 13, that is, the inner surface in the cross section orthogonal to the longitudinal direction of the seal groove 13, the two-point contact ensures more reliable sealing. Can be done.

5 and 6 show still another embodiment of the present invention, in which a flat plate-like seal member 10 made of an elastic material such as rubber is provided on the lower surface side of the fixing flange 3 of the valve body 2. Is integrally formed into an annular shape, and a seal protrusion 14 having a substantially triangular cross section is provided at a position corresponding to the seal member 10 on the mounting surface of the annular mount 12 disposed in the fuel intake portion. It is formed so as to integrally project.

In this embodiment, as shown in FIG.
By fixing and fixing the fixing flange 3 of the valve body 2 on the mounting surface of the valve body 2, the seal protrusion 14 bites into the seal member 10 to seal the valve body 2 and the mount 12. I have to.

Therefore, also in the present embodiment, as in the above-described respective embodiments, even if the width of the fixed flange 3 is small, the valve body 2 and the mount 12 can be reliably and easily sealed without using a gasket or the like. be able to.

Although the fixing flange 3 is provided on the peripheral portion of the inlet opening 4 in each of the embodiments, the sealing member 10 is provided within the range of the thickness of the inlet opening 4 without providing the fixing flange 3.
Etc. may be provided.

Further, the present invention is not limited to these embodiments and can be modified as necessary.

[Effect of device]

As described above, in the reed valve mounting structure according to the present invention, the seal groove or the seal projection of the mount and the seal member of the valve body are brought into close contact with each other to seal the valve body and the mount. Even if the width of the peripheral portion of the inlet opening of the valve body is small, the seal member can be easily formed, and the valve body and the mount can be reliably sealed. Moreover, since it is not necessary to use a gasket or the like, the valve body can be easily and quickly mounted, and the cost is low.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 show an embodiment of a reed valve mounting structure of the present invention. FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view showing a fixed state of the valve body of FIG. 1, FIGS. 3 and 5 are longitudinal sectional views of a fixing flange portion showing another embodiment of the present invention, FIGS. 4 and 6 respectively.
FIG. 8 is a vertical sectional view showing a fixed state of the valve body shown in FIGS. 3 and 5, respectively, FIG. 7 is a perspective view showing a conventional reed valve device, FIG. 8 is a vertical sectional view of FIG. 7, and FIG. FIG. 6 is a vertical sectional view of a conventional fixed flange portion. 1 ... Reed valve device, 2 ... Valve body, 3 ... Fixed flange, 1
0 ... Seal member, 12 ... Mount, 13 ... Seal groove, 1
4 ... Seal protrusion.

Claims (2)

[Scope of utility model registration request] 1. A reed formed by hermetically mounting a peripheral edge of the inlet opening of a valve body in which a fuel inlet opening and an outlet opening opened / closed by a reed valve are formed on a mounting surface of a mount of a fuel suction portion. In the valve mounting structure, a seal member formed of an elastic body is integrally formed on the entire circumference of the end surface of the inlet opening of the valve body so as to project, and a seal that tightly accommodates the seal member on the mounting surface of the mount. A reed valve mounting characterized in that a groove is formed, and the cross-sectional shapes of the seal member and the seal groove are formed so that they are in close contact with each other at a plurality of points in a cross section in a direction orthogonal to the longitudinal direction of the seal groove. Construction. 2. A reed formed by hermetically attaching the periphery of the inlet opening of a valve body, which has an inlet opening for fuel and an outlet opening opened / closed by a reed valve, to a mounting surface of a mount of a fuel suction portion. In the valve mounting structure, a flat plate-shaped sealing member made of an elastic body is integrally formed on the entire circumference of the end surface of the inlet opening of the valve body, and the mounting surface of the mount is bitten into the sealing member. The reed valve mounting structure is characterized in that a sealing protrusion is formed so as to be in close contact.