JPS6240098Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a ring for sealing a liquid hole in a gasket for an internal combustion engine, which is used by being fitted into a gasket for an internal combustion engine.

Prior Art For example, as described in Japanese Patent Application Laid-Open No. 11356/1983, the outer peripheral edge of a metal substrate with a fluid passage formed therein is
It is constructed by being fitted and fixed to a rubber body surrounding the fluid passage.

Metal substrates are made by punching and forming raw metal plates using a press, so so-called burrs may occur on the edges.The conventional structure described above, which tends to have burrs on the outer periphery, has rubber burrs due to the burrs when tightening. Body cracks easily.

In other words, products with conventional structures tend to have variations in product quality.

Furthermore, even if a burr-free metal substrate is obtained as a result of pull processing, cracks are likely to occur in the rubber body at the corners (cross-sectional corners) of the outer peripheral edge of the metal substrate.

In order to prevent these cracks, it is possible to perform secondary processing on the stamped metal substrate to remove burrs or round the corners, but this processing is complicated and
Inevitably, product prices will rise.

In addition, as the other means, for example,
It is also possible to process the metal substrate into a corrugated shape to provide unevenness, as described in Publication No. 29109, so as not to apply a tightening load to the outer edge of the substrate, but due to the size of the ring for sealing the liquid hole. Therefore, it may be practically impossible to form the above-mentioned irregularities on the metal substrate, and since the convex portions receive a tightening load, it does not necessarily prevent cracks.

Means for Solving the Problem A metal substrate is formed by superimposing a folded piece provided by folding back the outer periphery on a substrate main body in which a liquid passage is formed, and a circular base of the folded piece of the metal substrate is formed. , is constructed by being fitted and fixed to a rubber body surrounding the liquid passage.

Embodiment The drawing shows an embodiment of a ring for sealing liquid holes in a gasket for an internal combustion engine according to the present invention, in which 1 is a metal substrate, and the metal substrate 1 is folded around its outer periphery to a main substrate 3 in which a liquid passage 2 is formed. Folded piece 4 provided with
The folded portion of the folded piece 4 is configured as a circular base 5, and the circular base 5 at the outer end of the metal substrate 1 is connected to a rubber body surrounding the fluid passage 2 provided in the substrate 1. 6 and is fixed to form the liquid hole sealing ring A of the embodiment.

Thus, the sealing ring A is used by engaging with the liquid hole 10 formed in the gasket B for an internal combustion engine.

In this embodiment, the tip 4' of the folded piece 4 is
Although cracks may occur in the rubber body 6 due to the corners of the
Since it is located on one side of the ring in the folding direction, any cracks in the rubber body on that one side will be stopped, and the sealing performance of the ring as a whole will not be impaired.

In the second embodiment shown in FIG. 4, the tip 4' of the folded piece 4 is located at the edge of the liquid passage 2.

Furthermore, in each embodiment, when the outer peripheral edge of the substrate main body 3 is folded back to provide the folded piece 4, it is assumed that some wrinkles will occur on the surface of the folded piece 4, but this will depend on the processing technology and the folding width. This can be dealt with by selecting the size or the material of the metal substrate 1, and if
Even if wrinkles occur, the number and size of the wrinkles are small, and the tightening load is not concentrated on the convex portions of the wrinkles to cause cracks in the rubber body 6, so that the rubber body 6 can withstand practical use.

Effects of the invention Since the present invention has the above-mentioned configuration, the curved base of the folded piece of the metal board is positioned on the outer periphery of the board, fits into and fixed to the rubber body, and receives the tightening load on the surface. Therefore, cracks do not occur in the rubber body at the curved base, and therefore, it is possible to reliably prevent liquid leakage and provide a durable sealing ring. Furthermore, since the metal plate portion within the rubber body is double-layered, it is possible to prevent the rubber from escaping due to the tightening load, and to provide a product with a reduced amount of rubber.

[Brief explanation of the drawing]

The drawings show an embodiment of the rubber ring for sealing a liquid hole in a gasket for an internal combustion engine according to the present invention, in which FIG. 1 is a front view, FIG. 2 is a sectional view, and FIG. 3 is a front view of the rubber ring attached to the gasket. FIG. 4 is a sectional view of a portion of the second embodiment. DESCRIPTION OF SYMBOLS 1... Metal substrate, 2... Liquid passage, 3... Substrate main body, 4... Folded piece, 5... Circular base, 6...
Rubber body.

Claims (1)

[Scope of utility model registration request] A metal substrate is formed by superimposing a folded piece provided by folding back the outer peripheral edge of the substrate body on a substrate body in which a liquid passage is formed, and a circular base of the folded piece of the metal substrate is formed into a shape of the liquid passage. A ring for sealing the liquid hole of a gasket for an internal combustion engine, which is fitted and fixed to the rubber body surrounding the gasket.