JPH0723749B2 - Gasket and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A gasket and a method for manufacturing the same according to the present invention are mounted around an engine, such as a joint between a converter housing and a transmission case of an automobile, and the joint is It is used as a gasket for maintaining oil tightness, or as a manufacturing method for manufacturing such a gasket.

(Prior Art) By installing a gasket at the joint between the converter housing of the automobile and the transmission case,
The transmission oil existing in the transmission case is prevented from leaking from the joint.

For this reason, conventionally, a gasket matched to the shape of the abutting surface of the joint portion has been used. It is also possible to use an oil swelling type compound that expands in volume when it is exposed to oil, as a compound that constitutes such a gasket.
Partly done.

When the gasket is composed of an oil-swelling compound, after the gasket is sandwiched between the abutment surfaces of the converter housing and the transmission case, the volume of this gasket expands, so the gasket is pressed between the abutment surfaces. The force is increased, and the oil tightness of the joint portion between the converter housing and the transmission case is improved.

(Problems to be Solved by the Invention) However, a gasket made of an oil-swelling compound has a weak tensile strength and cannot always maintain sufficient durability.

In particular, since the gasket sandwiched between the joint between the converter housing and the transmission case is frequently subjected to shearing stress due to engine output fluctuations,
A large tensile strength is required to obtain sufficient durability.

By constructing a gasket by stacking oil-swelling compounds on both sides of the iron plate with hooks that is the core material, the tensile strength of the gasket can be sufficiently improved, but simply compound the compounds on both sides of the iron plate with hooks. Only by doing so, it is unavoidable that the tip of the hook formed on the iron plate with hook is exposed on the surface of the compound, and the sealing property of this exposed portion deteriorates, so that sufficient sealing performance cannot be obtained.

The gasket and the manufacturing method thereof according to the present invention eliminate the above-mentioned disadvantages.

(Means for Solving the Problem) Among the gasket of the present invention and the method for manufacturing the same, the invention of the gasket described in claim 1 is composed of an iron plate with a hook which is a core material, and an oil-swelling compound, The first compound layer laminated on both front and back surfaces of the iron plate with hook and the non-oil swelling type compound, the surface of the first compound layer, the hook formed on the iron plate with hook is completely It is composed of a second compound layer that covers in a hidden state.

In the invention of the method for manufacturing a gasket according to claim 2, the hooked iron plate, which is the core material, is passed between the pair of first rubbing rollers, so that both sides of the hooked iron plate are covered. By stacking the oil-swelling compound by sliding it in, and forming the first compound layer on both front and back sides of the iron plate with hook, at the same time crushing the tip of the hook formed on the iron plate with hook. , The tip of the hook does not protrude from the surface of the first compound layer, and then passes through a pair of second rubbing rollers over a hooked iron plate having first compound layers formed on both front and back surfaces. By doing so, the non-oil swelling type compound is rubbed on the surface of the first compound layer to be laminated, and the surface of the first compound layer is formed by the second compound layer. Is Umono.

(Operation) In the case of the gasket of the present invention, which is produced by the method of the present invention configured as described above, the first compound layer composed of the oil-swelling compound by the iron plate with the hook which is the core material, Since the second compound layer composed of the non-oil swelling compound is reinforced, sufficient tensile strength can be secured.

Further, since the surface of the gasket is covered with the second compound layer and the tip of the hook is not exposed, the sealing property is sufficiently ensured.

(Example) Next, the present invention will be described in more detail with reference to the illustrated example.

1 to 4 show an embodiment of the present invention, FIG. 1 is a view corresponding to an enlarged AA cross section of FIG. 2, FIG. 2 is a perspective view showing the entire structure of a gasket, and FIG. Fig. 4 is a schematic vertical sectional view showing a state of manufacturing this gasket, and Fig. 4 is a view corresponding to an enlarged BB section of Fig. 2.

The gasket 1 is formed in a frame shape as shown in FIG. 2 according to the shape of the joint surface such as the joint portion between the converter housing and the transmission case where oil tightness should be maintained. As shown in FIG. 1, the gasket 1 of the present invention is composed of an iron plate 2 with a hook as a core material and an oil-swelling compound, and is laminated on both front and back surfaces of the iron plate 2 with a hook. And the first compound layer 3, which is composed of a non-oil swelling compound
3 and the second compound layers 4 and 4 covering the surface.

A large number of hooks 5 and 5 formed on the front and back surfaces of the iron plate 2 with hooks are crushed toward the surfaces of the first compound layers 3 and 3, respectively, and do not project from the surfaces. It is in a state. Therefore, the hooks 5 and 5 are not exposed at all on the surfaces of the second compound layers 4 and 4.

When manufacturing the gasket 1 having the above configuration,
As shown in FIG. 3, by passing the iron plate 2 with hooks, which is a core material, between the pair of first rubbing rollers 6, 6, both sides of the iron plate 2 with hooks are oil-swelled. The first compound layers 3, 3 are formed on both front and back surfaces of the iron plate 2 with hooks by laminating the compounds by sliding.

In this way, the first compound layers 3 and 3 are formed on both the front and back surfaces of the iron plate 2 with hooks, and at the same time, the pair of first rubbing rollers 6 and 6 crush the tips of the hooks 5 and 5 so that each hook 5 5, the tip portion of the first compound layer 3,
The surface of 3 does not protrude.

In this way, the iron plate 2 with hooks is moved to the first rubbing rollers 6, 6
When the first compound layers 3 and 3 are formed on both the front and back surfaces of the iron plate 2 with hooks by passing through the gaps, and the tips of the hooks 5 and 5 are crushed, then the first compound layers 3 and 3 The hooked iron plate 2 on which the compound layers 3 and 3 are formed is passed between the pair of second rubbing rollers 7 and 7.

A pair of second rubbing rollers 7, 7 are used to slide a non-oil swelling compound on both sides of the iron plate 2 with hooks on which the first compound layers 3 and 3 are formed on both sides. Layered, the surfaces of the first compound layers 3 and 3 are covered with the second compound layers 4 and 4, and the gasket 1 of the present invention is completed.

In the case of the gasket 1 of the present invention constructed by the method of the present invention configured as described above, the iron plate with hook 2 which is the core material
As a result, the first compound layers 3 and 3 composed of the oil-swelling compound and the second compound layers 4 and 4 composed of the non-oil-swelling compound are reinforced, so that sufficient tensile strength is secured. It is possible to secure sufficient durability even when it is used in a portion where a constant shearing stress is applied, such as a joint between a converter housing of an automobile and a transmission case.

In addition, the surface of the gasket 1 is the second compound layer 4, 4
Since the end portions of the hooks 5 and 5 are not exposed because they are covered with, the sealing property is sufficiently ensured.

The thickness of the gasket 1 should be within the range of 0.4 to 0.6 mm from the viewpoint of minimizing the fatigue of the compound layer during operation while ensuring sufficient sealing performance. Is. In the manufacturing method of the present invention, since the gasket 1 is manufactured by forming the compound layer by rubbing, it is possible to manufacture a thin gasket 1 in the above range.

Further, when the fastening force of the bolts for joining the converter housing and the transmission case is low, or when the intervals between the bolts are long, if the gasket 1 remains flat, a sufficient surface is provided between the bolts. Hard to generate pressure. In such a case, if the bead 9 as shown in FIG. 4 is provided around the through hole 8, the sealing property around the through hole 8 is further improved. Even if the bead 9 is settled during operation, the oil-swelling compound that forms the first compound layers 3 and 3 swells, so that stable sealing performance can be obtained for a long period of time. The height of the bead 9 should be such that the bead 9 follows the deformation of the sealing surface, and if the height of the bead 9 is too high, cracking may occur in the compound layer due to bead processing, Since it is easy for the bead to settle inside, it is appropriate to set it within the range of 0.2 to 0.5 mm.

(Effects of the Invention) Since the gasket of the present invention and the method for manufacturing the same are constructed and operate as described above, a gasket having sufficient sealability and strength can be obtained, and the converter housing and the mission case can be joined together. The durability and reliability of the part can be improved.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, and FIG.
A view corresponding to an enlarged AA cross section of FIG. 2, FIG. 2 is a perspective view showing the entire structure of the gasket, FIG. 3 is a schematic vertical cross-sectional view showing the state of manufacturing this gasket, and FIG. 4 is FIG. FIG. 8 is a view corresponding to an enlarged BB cross section of FIG. 1: Gasket, 2: Iron plate with hook, 3: First compound layer, 4: Second compound layer, 5: Hook, 6: First sliding roller, 7: Second sliding roller, 8: Through hole , 9: Beads.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Sasaki 1-5-2 Fukaminishi Yamato-shi, Kanagawa Nihon Lines Co., Ltd. (72) Inventor Katsuhide Fujisawa 1-5-2 Fukaminishi, Yamato-shi, Kanagawa No. Nihonhon Rinz Co., Ltd. (56) Reference JP-A-1-227854 (JP, A) JP-A-50-139186 (JP, A) Actual development Shou 62-87257 (JP, U)

Claims (2)

[Claims] 1. An iron plate with a hook which is a core material, and an oil-swelling compound, which is composed of a first compound layer laminated on both front and back surfaces of the iron plate with a hook, and a non-oil swelling compound. A gasket comprising a second compound layer, which covers the surface of the first compound layer so as to completely hide the hooks formed on the iron plate with hooks. 2. An iron swelling compound, which is a core material, is passed between a pair of first rubbing rollers so that an oil-swelling compound is rubbed into both front and back surfaces of the hooking iron plate. The first compound layers are laminated to form the first compound layer on both front and back surfaces of the iron plate with hook, and at the same time, the tip part of the hook formed on the iron plate with hook is crushed, so that the tip part of the hook is When the iron plate with hooks having the first compound layer formed on both front and back surfaces is passed between the pair of second rubbing rollers so that the compound layer does not project from the surface of the first compound layer, Laminate a non-oil swelling compound on the surface so that it rubs, and then the surface of the first compound layer,
A method of making a gasket, which is covered with a second compound layer.