JP4292852B2 - gasket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gasket, and is used in industries such as the automobile industry, accessory manufacturers, general industrial relations, and home appliances.
[0002]
[Prior art]
For example, there is a gasket compressed between two opposing surfaces used for sealing a resin intake manifold (hereinafter referred to as an intake manifold).
[0003]
In such a gasket, it is difficult to determine whether or not the gasket is mounted when the two opposing surfaces are brought into contact with each other.
[0004]
Therefore, as shown in FIGS. 4 and 5, the gasket 101 is exposed to the outside by extending from the gasket body 102 to a notch opened to the outside of the housing so that it can be confirmed from the outside that the gasket 101 is mounted. An identification protrusion 103 is formed on the gasket 101.
[0005]
Therefore, the presence of the gasket 101 can be determined by confirming that the identification protrusion 103 is exposed to the outside after the gasket 101 is mounted on the intake manifold.
[0006]
Further, as another application, the identification protrusion 103 may be gripped and pulled when the gasket produced in the manufacturing process is released from the mold or maintenance after mounting, and used for removing the gasket. is there.
[0007]
[Problems to be solved by the invention]
However, when the gasket is used for removing the gasket, it is not the original use of the identification protrusion that the identification protrusion is grasped and pulled. Therefore, as shown in FIG. 6, the identification protrusion 103 is pulled and torn from the root. There was a case.
[0008]
In particular, the identification protrusion is often torn off at the time of releasing from the mold in the manufacturing process, where the identification protrusion is pulled at a high temperature. If such identification protrusions are broken and defective products are generated, the productivity of the gasket is lowered, which becomes a problem.
[0009]
Conventionally, it has been common to take measures against this problem by increasing the size of the identification protrusion. However, it is necessary to change the size of the notch in which the identification protrusion on the housing side such as the intake manifold to which the gasket is attached is disposed. For this reason, when the dimension of the cutout portion cannot be changed, a measure for increasing the dimension of the identification protrusion may not be taken.
[0010]
The present invention has been made in view of the above prior art, and an object of the present invention is to provide a gasket in which an identification protrusion is prevented from being torn even if it is gripped and pulled.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present inventor has focused on the fact that when the identification protrusion of the gasket is grasped and pulled, it is torn off from the root, and the idea has been reinforced to prevent the root from being torn. Then, in realizing this idea, only the root of the identification protrusion is reinforced so that it is not necessary to change the size of the notch where the identification protrusion is disposed, which has been a problem in the past. For reinforcement, a material change, a cover with multiple members, and the like can be considered. However, in view of productivity and cost, the invention is embodied by increasing the cross-sectional area of only the base with the same material of the identification protrusion.
[0012]
That is, the gasket of the present invention is fitted into a mounting groove formed on one of the two opposing surfaces, and in a notch portion opened to the outside from the mounting groove in a use state where the two opposing surfaces are butted together. a gasket having an identification projection which is exposed to the outside extending, said identification protrusion is characterized in that increased by providing a level difference as compared with cross-sectional area of the root cross section area of the distal end side.
[0013]
Here, “to make the root cross-sectional area larger than the cross-sectional area on the tip side” includes making the identification protrusion a little thicker than the tip side, and further, the height direction and width of the identification protrusion. It is also achieved by increasing only at least one of the directions or by increasing only a part of the direction. Essentially, it is only necessary that the basic sectional area of the identification protrusion is larger than the sectional area on the tip side.
[0014]
More specifically, it is fitted into a mounting groove formed on one of the two opposing surfaces, and extends from the mounting groove to a notch that is open to the outside in a state of use where the two opposing surfaces are butted together. A gasket having an identification protrusion exposed to the outside, wherein the identification protrusion is thicker than the tip side by providing a step .
[0015]
Therefore, even if the root of the identification protrusion is strengthened against tension and the identification protrusion is gripped and pulled, it is possible to suppress the identification protrusion from being torn off from the root. Thereby, productivity can be improved by reducing the defect occurrence rate at the time of manufacture when releasing from the mold, and maintenance can be improved by facilitating removal after removal after mounting.
[0016]
Further, since only the root of the identification protrusion is enlarged, it is not necessary to change the size of the notch portion where the identification protrusion on the housing side such as the intake manifold to which the gasket is attached is disposed. Furthermore, while achieving the purpose of suppressing tearing, the shape that increases the size of the base of the identification protrusion can be changed as appropriate in accordance with the size of the notch.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings.
[0018]
With reference to FIGS. 1-3, the gasket which concerns on 1st Embodiment is demonstrated. FIG. 1 is a plan view showing a gasket according to the embodiment. 2 is an enlarged plan view, a cross-sectional view, and a perspective view of a portion A of FIG. 1 of the gasket according to the embodiment. FIG. 3 is an enlarged plan view and a cross-sectional view illustrating a state when the gasket is fitted in the mounting groove of the gasket according to the embodiment, in which the portion A in FIG. 1 is enlarged.
[0019]
The gasket 1 according to the present embodiment is used in a state in which two opposing surfaces of a housing surface on which a mounting groove is formed and an opposing surface (not shown) facing the housing surface are abutted.
[0020]
The gasket 1 of this embodiment is comprised from the gasket main body 2 and the identification protrusion 3, as shown in FIG.
[0021]
The gasket main body 2 has an annular shape, and in use, the inner peripheral side is a sealed space.
[0022]
As shown in FIG. 3, the gasket body 2 is fitted into a mounting groove 22 formed in the housing 21. When the housing surface 23 in which the mounting groove 22 of the housing 21 is opened and the facing surface (not shown) facing the housing surface 23 face each other, the gasket body 2 faces the projecting end 2a projecting from the mounting groove 22 from the facing surface side. It is compressed with.
[0023]
The cross-sectional shape of the gasket body 2 is an elliptical cross section having a major axis in the direction sandwiched between the bottom surface 22a of the mounting groove 22 and the opposing surface, as shown in FIG. In the present embodiment, the cross-sectional shape of the gasket body 2 is the elliptical cross section shown in FIG. 3B, but is not limited thereto, and the mounting groove is not limited to the elliptical cross section shown in FIG. The cross-sectional shape is not particularly limited as long as the shape is sandwiched between the bottom surface 22a of 22 and the opposing surface.
[0024]
On the other hand, as shown in FIG. 1, the identification protrusion 3 is provided only at one location from the gasket body 2. The identification protrusion 3 protrudes from the outer periphery of the gasket body 2 in the outer diameter direction.
[0025]
As shown in FIG. 3, when the gasket 1 is fitted into the mounting groove 22 of the housing 21, the identification protrusion 3 is inserted into a notch 24 formed in the housing 21 from the mounting groove 22 to the outside. Be placed.
[0026]
Therefore, in the state shown in FIG. 3, the identification protrusion 3 extends to the notch 24 and protrudes to the outside and exposed. For this reason, the identification protrusion 3 can be confirmed from the outside even in a use state where the two opposed surfaces are abutted.
[0027]
As shown in FIG. 2, the base of the identification protrusion 3, which is a feature of the identification protrusion 3 of the present embodiment, is formed with a large diameter portion 3 a that is slightly larger than the tip side of the identification protrusion 3. The large-diameter portion 3a is thicker than the distal end side of the identification protrusion 3 with a step. In the present embodiment, the large-diameter portion 3 a is formed larger in both height and width than the tip end side of the identification protrusion 3.
[0028]
As shown in FIG. 3, the identification protrusion 3 changes the height dimension T and the width dimension W on the tip side ahead of the large diameter part 3a of the identification protrusion 3 even if the large diameter part 3a is formed. And is disposed in the notch 24. That is, the large-diameter portion 3 a is formed large so as not to contact the notch 24 according to the size of the notch 24. For this reason, it is not necessary to change the depth dimension T ′ and the width dimension W ′ of the notch 24.
[0029]
The shape of the large-diameter portion 3a at the base of the identification protrusion 3 is designed according to the size of the notch 24 where the identification protrusion 3 is arranged, and the filling rate of the arrangement portion of the large-diameter portion 3a is excessively large. It is made not to become.
[0030]
In the present embodiment described above, the root of the identification protrusion 3 becomes the large-diameter portion 3a and is strengthened against tension, and even if the identification protrusion 3 is gripped and pulled, the identification protrusion 3 is torn off from the root. Can be suppressed. Thereby, productivity can be improved by reducing the defect occurrence rate at the time of manufacture when releasing from the mold, and maintenance can be improved by facilitating removal after removal after mounting.
[0031]
Moreover, since only the root of the identification protrusion 3 is enlarged as the large diameter part 3a, it is not necessary to change the dimension of the notch 24 in which the identification protrusion 3 is disposed in the housing 21 to which the gasket 1 is attached.
[0032]
Here, while achieving the purpose of suppressing tearing, the shape of the large-diameter portion 3a at the base of the identification protrusion 3 can be appropriately changed in accordance with the size of the notch portion. it can.
[0033]
(Comparative test)
A test was conducted to determine whether the gasket of the above-described embodiment has an effect of suppressing the tearing caused by the tension of the identification protrusion compared to the conventional gasket.
[0034]
The test is performed by molding the conventional gasket 101 shown in FIGS. 4 and 5 and the gasket 1 according to the embodiment shown in FIGS. The mold release was performed by grasping and pulling the identification protrusions 103 and 3.
[0035]
In the gasket 101 of the prior art, the number of the identification protrusions 103 torn from the root was 9 out of 10, which was a 9/10 defect occurrence rate.
[0036]
On the other hand, in the gasket 1 of the embodiment, the number of the identification protrusions 3 torn from the root is 0 out of 10 and the defect occurrence rate is 0/10, no defect occurs, and compared with the conventional case. As a result, the incidence of defects was significantly improved.
[0037]
【The invention's effect】
As described above, the present invention can suppress tearing even if the identification protrusion is grasped and pulled.
[Brief description of the drawings]
FIG. 1 is a plan view showing a gasket according to an embodiment.
FIG. 2 is a plan view, a cross-sectional view, and an enlarged view showing a part of FIG. 1A of the gasket according to the embodiment.
FIGS. 3A and 3B are a plan view and a cross-sectional view showing a fitting state of a portion of FIG. 1A of the gasket according to the embodiment.
FIG. 4 is a plan view showing a conventional gasket.
FIG. 5 is a plan view, a cross-sectional view, and an enlarged view showing a portion of FIG. 4B of a conventional gasket.
FIG. 6 is a plan view showing a state in which the identification protrusion of the conventional gasket has been torn off.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gasket 2 Gasket main body 2a Projection end part 3 Identification protrusion 3a Large diameter part 21 Housing 22 Mounting groove 22a Bottom face 23 Housing surface 24 Notch

Claims (2)

Identification that is fitted into a mounting groove formed on one of the two opposing surfaces and that is exposed to the outside by extending from the mounting groove to a notch that is open to the outside in a state of use where the two opposing surfaces are butted. A gasket having protrusions,
The gasket according to claim 1, wherein the identification protrusion has a larger cross-sectional area at a base than a cross-sectional area on the tip side to provide a step . Identification that is fitted into a mounting groove formed on one of the two opposing surfaces and that is exposed to the outside by extending from the mounting groove to a notch that is open to the outside in a state of use where the two opposing surfaces are butted. A gasket having protrusions,
A gasket characterized in that the identification protrusion is thicker than the tip side by providing a step .

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