JPS6049166A - Scarf joint gasket - Google Patents

Abstract

PURPOSE:In a gasket wherein cut pieces each having a stepped part and a tapered part formed in its end portion are connected with each other, properly to connect the cut pieces with each other to improve the property, quality, durability and the like by specifying the depth of cut of the stepped part and the angle of inclination of the tapered part. CONSTITUTION:A flat gasket material is cut into the shape of band and the like, and the end portion of each of cut pieces 1 and 2 is cut into the shape of step having a stepped part 4 and a tapered part 5. The cut part of each of the cut pieces 1 and 2 is coated with an adhesive, and the cut pieces 1 and 2 are connected with each other to form a scarf joint gasket. In this case, when the thickness of the gasket material is t, the depth d of cut of the stepped part 4 is in the range of 0.15t-0.3t and the angle of the tapered part 5 is in the range of 1 deg.-15 deg.. Thus, the connecting parts is surely positioned during adhesion of the cut pieces 1 and 2, and the surface of the connected gasket is smoothed more surely. As a result, stress concentration to corner parts of the notch in the stepped part is excluded, as well is falling off of the connected end face is prevented so that liquid leakage is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to gaskets used in joints such as industrial containers and large pipe joints, and in particular gaskets used in joints between the crankcase and oil pan of internal combustion engines. It is suitable for large gaskets with large spaces used in generators, ships, and various plants.

PRIOR ART In general, gaskets are molded by punching a flat gasket material with a die into a desired shape.
The hollow part of the punched gasket is either discarded or reused as material for smaller gaskets. However, it is uneconomical because it is impossible to fully utilize the punched portion.

For this reason, conventionally, in the case of large gaskets, in addition to methods in which the material is simply punched out, joining methods have been proposed in which the material is cut into strips and the strips are joined together.

One example is as follows. The one shown in FIG. 1 is a butt-butting method in which a strip 1 and a strip 2 are butted against each other, and a suitable adhesive is applied to the butted portion 14 to join them.

As shown in FIG. 2, a wedge-shaped recess 24 and a wedge-shaped protrusion 25 are respectively formed on the strip 1 and the strip 2, and the protrusion 25 is fitted into the recess 24. ``It is combined with C1.

In the one shown in FIG. 3, an ohm-shaped recess 34 is formed in the strip 1, an ohm-shaped protrusion 35 is formed in the strip 2, and these are fitted and joined.

Further, in the one shown in FIG. 4, a disc-shaped joint piece 45 is interposed between the strip 1 and the belt-shaped piece 2, and the disc-shaped joint piece 45 is provided with a protrusion 44 and a bolt hole 3 that protrude from side to side. The convex portion 44 is fitted into the concave portion 46 of the strip 1 and joined.

These conventional gaskets have a small area and are mainly butt-jointed, so it is difficult to join them accurately, and gaps m) are created in the joints. Also resistance to tensile force and bending1
In order to improve the disadvantages of the conventional bonding method gaskets, which have weak force and may be deformed, reducing the gasket's sealing function and causing fluid leakage, we have developed a polymerization method gasket. has also been proposed.

The one shown in FIG. 5 is one example, in which the end of the strip 1 and the end of the strip 2 are ground into a tapered shape and overlapped, and the overlapped part 5
4 was coated with an appropriate adhesive and bonded.

However, the gasket using this polymerization method has a large area for one joint, and the joint p! However, on the other hand, there is a score for the position hole during bonding, and if it happens, a stepped portion 55 will occur at the bonded part, and the product will not be finished flat. However, when grinding into a tapered shape, the grinding end is likely to be chipped 56, resulting in a defective product.

Still, as shown in FIG. 6, the ends of strip 1 and the ends of strip 2 are cut into an L shape on the strap, and the claws are joined together to form the overlapping part 6.
4 is also known, which is bonded by applying an appropriate adhesive.

Although this gasket achieved good results in terms of bonding strength and position hole alignment during adhesion, it had the disadvantage that stress was concentrated at the corner 65 of the L-shaped cut [7] and it was prone to breakage 66 from this part.

Enmei's invention is to provide a gasket that eliminates these conventional drawbacks.It is a gasket that is stamped and molded from a flat plate material and has the same performance, quality, and durability, while saving on materials. 1. This relates to an improved gasket that is suitable for various locations.

Structure of the Invention The present invention provides a step part 4, a tapered shape; This gasket is made by cutting and molding into a step shape, and then bonding and bonding them to each other, and where the thickness of the gasket is t1 and the cut of the step part is d, d=0.15t to 0.35t.
The gist of the gasket is a spliced gasket characterized in that the angle α of the tapered portion 5 is 1° to 15°.

Embodiments of the Invention The embodiments of the present invention will be described with reference to the drawings.
Sheets, paper mail sheets, cork 2-bar sheets, rubber sheets, fluorine-based synthetic resin sheets, fiber-reinforced plastics, ceramics, etc. are used. Cut into strips, arcs, and other special shapes.

The ends of the cut pieces 1 and 2 are cut with a diamond cutter, and have a step part 4, a T-bar A5, and a step part 4, as shown in FIGS. 7 to 9. Cut and shape into steps. After applying a contact agent compatible with the gasket material, such as a rubber adhesive or a synthetic resin adhesive, to the cut parts of the cut pieces 1 and 2, they are butted against each other, and They are also overlapped and bonded.

In this case, the stepped portion 4 and the tapered portion 5 are 1:, 8th
As shown in the figure and Fig. 9, the gasket material J7F
When t is the notch d of the stepped portion 4, the depth is 0.15t to 0.
．． 35°t, and the taper part 50 angle α is 1° to 1
The cut d of the step part 4 is preferably in the range of 5°, and the angle α of the tapered part 5 is selected to be between 3° and 4°. This helps to accurately mark the position holes when joining the cut pieces 2 and prevents them from being missed during cutting with the cutter, but if the value is smaller than this range, the position holes may not be properly set during joining. It is easy to cut accurately, and it is not possible to prevent the tendency of the end face to be chipped during cutting, and if the above numerical value range is exceeded, tensile force may be applied to the gasket, or stress may be applied to the corner of the cut corner of the stepped portion 4 if it is bent. If the cracks are concentrated in this part, there is a risk that the part will be cut off.

Additionally, if the taper angle α is made larger than the numerical range mentioned above, the bonding area becomes narrower and the bonding strength decreases, and if the taper angle α is made smaller than the numerical range mentioned above, the machining accuracy will be poor and the resulting variations in adhesive application will occur. This may hinder smoothing of the joint surface.

If necessary, the light t4 can be applied to the joint portions of the gaskets that have been butted, overlapped, and bonded as described above during or after the bonding process.

In the case shown in Fig. 10, cut pieces 1 and 2 cut out from the gasket ff1H are cut out to be slightly wider than the gasket that will become the finished product. This is what I took.

The special type 4 gasket shown in Figures 11 and 12 is
All of these gaskets are examples of gaskets that can be used for internal combustion engines, and are joined at the parts that meet the lines A-A and B-B in the same figure.

In addition, the one shown in Figure 13 is an example of a large-diameter gasket made from a fluorine-based synthetic resin board. A-A line,
Although it is joined along the line B-B, it is of course possible to divide it into 6 equal parts, 8 equal parts, etc. as desired.

Effects of the Invention As explained above, the spliced gasket according to the present invention is obtained by cutting the end of the η piece cut from the gasket material into a step shape having a stepped portion, a tapered portion, and a stepped portion,
By selecting the notch of the stepped part in a specific range relative to the thickness of the gasket material and specifying the inclination angle of the taper part, the position of the joint part Tr' can be accurately determined at the time of pile installation, and the completed gasket is completed. This ensures flatness of the joint, prevents chipping of the joint end face, eliminates fluid leakage, and eliminates stress concentration at the cutting angle M of the extended step, and widens the contact area to reduce stress. By dispersing the gasket, the sealing function of the gasket can be fully demonstrated, without the cracks '9' cut from the joint part being trapped against tension, compression, bending, and torsion.

[Brief explanation of drawings]

Figures 1, 2, 3, and 4 are plan views of conventional joining type gaskets, Figures 5 and 6 are side views of conventional polymerization type gaskets, and Figures 7 to 13. The figures show a jointed gas scooter according to the present invention, and Fig. 7 is a plan view, 8th is a side view of N, and tE9 is a perspective view of the first row of mating parts ν1.
, Fig. 10 1, Explanation [11 Fig. 11 and 12 1
is a plan view of a specially shaped gasket, and Figure 13 is a plan view of a large diameter gasket. 1...Cut piece, 2...Cut piece, 3...Bot A hole, 4...Dan section, 5...Part of Pahuba, special edition attorney P attorney Osamu Iwasaki Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure A Figure 13 393-

Claims (2)

[Claims] (1) The ends of the gasket material are cut into strips, arcs, and other special shapes, and the ends are cut into steps, tapered parts, and steps, and then bonded and glued together. When the thickness of the gasket is t1 and the cut of the step part is d, d=0.15.
At t −+1.35t, taper angle α=10~15°
A joint gasket characterized by: (2) The spliced gasket according to claim 1, wherein a filler is applied to the joint adhesive portion of the end portion of the gasket. (,”3) The pieces cut from the gasket material are
The fitted gasket according to Claims 11 and 2, characterized in that the width is slightly wider than that of the finished gasket.