JPH1181U - Spiral gasket - Google Patents

Abstract

(57) [Problem] To provide a spiral gasket capable of holding an inclined exhaust pipe without falling off. SOLUTION: In a spiral gasket configured by spirally winding a metal hoop material 1 and a filler material 2 on top of each other, a plurality of spirally wound inner hoop materials are wound from the leading end of the inner hoop material to the vicinity of the welding fixing part 3. The leading hoop material portion 1a is raised on the inner peripheral side with the weld fixing portion 3 as a fulcrum, and its tip is turned back to an overlapping portion 1b. [Effect] The raised hoop material portion 1a functions as a spring, which comes into contact with the inclined exhaust pipe 5 in a resilient manner, whereby the gasket is held by the exhaust pipe.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a method of manufacturing a spiral gasket, for example, a spiral used to seal the inside and outside of a pipe at a pipe connecting portion of an automobile exhaust pipe by being sandwiched between flanges formed at respective ends. It relates to improvement of a gasket.

[0002]

[Prior art]

 6 and 7 show a conventional spiral gasket. In FIG. 1, reference numeral 1 denotes a hoop material made of a thin metal sheet (having a thickness of about 0.13 mm to 0.15 mm) having a corrugated cross section, and 2 denotes a filler material formed mainly of inorganic fibers or the like. As a method of manufacturing the spiral gasket having the above structure, first, only the hoop material 1 is wound around a winding piece (not shown) for two to three turns (empty winding), and a spot is formed at a required portion of the wound portion. The weld fixing part 3 is formed by welding, and then the filler material 2 is inserted, and the hoop material and the filler material are overlapped and wound. At the end of the winding, only the hoop material is wound (empty winding), and spot welding is performed. The materials are fixed to each other.

[0003] The welding fixing portion 3 of the inner peripheral side hoop material is formed at a position about 1/4 turn away from the leading end of the winding at the time of manufacturing, and the hoop material portion 1a corresponding to the 1/4 turn is left. However, since the burr at the end is dangerous during handling, the hoop material portion 1a is cut and removed in the vicinity of the welding fixing portion 3 to obtain a product.

[0004]

[Problems to be solved by the invention]

 FIGS. 8 and 9 show a state in which the spiral gasket as the product is sandwiched and used between flanges formed on the end pipes at a pipe connecting portion of an automobile exhaust pipe. A is a spiral gasket of the above construction, 4 and 5 are exhaust pipes, 6 and 7 are flanges, and 8 and 9 are fastening bolts and nuts.

When the spiral gasket is fitted to the exhaust pipe and mounted, as shown in FIG. 8, when the exhaust pipe is horizontal with respect to the floor, the fitted gasket is stable at that position. Although well supported, as shown in FIG. 9, when the exhaust pipe is inclined with respect to the floor, the fitted gasket is likely to fall off. By the way, when the outer diameter of the exhaust pipe is 48.6 ± 0.3 mm, if a spiral gasket with an inner diameter of 50.0 mm and an outer diameter of 65.0 mm is used, the gap between them is 1.1 to 1.7 mm. Yes, the gasket falls off the exhaust pipe easily. For this reason, bolts and nuts must be tightened while holding the gasket so that it does not fall off the exhaust pipe, and the efficiency of gasket installation is extremely poor.

The present invention has been made to solve the above problem, and has as its main object to provide a spiral gasket capable of holding an inclined exhaust pipe without falling off. And

[0007]

[Means for Solving the Problems]

 The present invention provides a spiral gasket manufacturing process in which a hoop material is formed by winding the hoop material around the inner circumference a plurality of times. The gist is to form a hoop material portion acting as a spring that elastically contacts the hoop material, and to weld and fix a base end portion of the hoop material portion acting as the spring.

According to the spiral gasket obtained in the above manufacturing process, the hoop material portion raised on the inner peripheral side of the gasket has a spring action, and is fitted into the exhaust pipe by the hoop material portion having the spring action. The gasket is held elastically against the exhaust pipe. Therefore, the gasket fitted in the inclined exhaust pipe is held in the exhaust pipe without falling off.

[0009]

【Example】

 1 and 2 show an embodiment of the manufacturing process of the present invention. The same or similar parts as those in FIGS. 6 and 7 are denoted by the same reference numerals. That is, 1 is a hoop material made of a thin metal sheet having a corrugated cross section, and 2 is a filler material. The winding start end of the empty hoop material wound around the inner periphery of the gasket a plurality of times and about 1/4 turn from there. The hoop material portion 1a between the welding fixing portion 3 and the welding fixing portion 3 is erected toward the inner peripheral side of the gasket with the welding fixing portion 3 as a fulcrum, and the tip is folded back in a flat state. , An overlapping portion 1b is formed. It is preferable that the leading edge side spacing H when the hooping material portion 1a is caused is in the range of 2 to 7 mm, and the overlapping length L of the tip overlapping portion 1b is about 5 mm. Although the tip overlapping portion 1b of the hoop material portion 1a is folded inward in the illustrated example, it may be folded outward. The tip of the raised hoop may damage the hand when working with the gasket, but if it is folded back, the danger is eliminated and the safety of the work is maintained. However, this wrap may be omitted.

According to the spiral gasket obtained in the above manufacturing process, as shown in FIG. 2, when the spiral gasket is fitted into the exhaust pipe 5, the hoop material raised on the inner peripheral side of the gasket. Reference numeral 1a functions as a spring member, and an overlapping portion 1b at the tip thereof abuts against the exhaust pipe 5 in a resilient manner, and the gasket is elastically held by the exhaust pipe by the spring action of the hoop material portion 1a.

Therefore, when the spiral gasket is fitted into the inclined exhaust pipe and tightened with bolts and nuts, the gasket is resiliently held by the exhaust pipe by the hoop material portion 1a having a spring action. It is not. The use of the spiral gasket obtained by the above-mentioned manufacturing method is not limited to the exhaust pipe of an automobile, but can be widely used as a gasket for sealing the inside and outside of other fluid piping.

FIG. 3 shows another embodiment of the manufacturing process of the present invention. In this embodiment, a mountain-shaped hoop portion 1c that rises in the circumferential direction is formed at the winding start portion of the inner hoop material 1 that has been wound a plurality of times, and is formed at both base end portions of the mountain-shaped hoop portion 1c. A welding fixing part 3 is provided. Even in the above configuration, the chevron hoop portion 1c acts as a spring on the outer peripheral surface of the pipe, which is compared to the spring hoop material portion 1a standing up in a rod shape shown in FIGS. This is advantageous because the force as a spring is stabilized.

4 and 5 show another embodiment of the manufacturing process of the present invention. In this embodiment, a mountain-shaped hoop portion 1d is formed on the inner hoop material 1 wound around a plurality of turns at a center angle of about 120 degrees toward the center in the width direction. A weld fixing portion 3 is provided in a portion near the mountain-shaped hoop portion 1d. According to the spiral gasket obtained in the above manufacturing process, since the three mountain-shaped hoop portions 1d act as springs on the outer peripheral surface of the pipe, the holding force to the pipe by the spring is improved and the pipe is attached to the pipe. A gasket centering effect is obtained.

[0014]

[Effect of the invention]

 As described above, according to the present invention, a spiral gasket that can be held without falling off the inclined pipe can be easily manufactured. In particular, the spiral gasket of the present invention shown in FIGS. 1 and 2 is manufactured to have a structure in which the inner peripheral hoop material portion that has been cut and removed in the conventional gasket manufacturing process is caused to function as a spring member. Therefore, even if the processing cost is slightly higher than the cutting and removing cost, the cost is extremely low as compared with the cost of providing the spring member as a separate member, and there is an advantage that it can be provided at low cost. Further, in the spiral gasket obtained by the manufacturing process of the present invention shown in FIG. 3, the spring force on the tube can be stabilized. According to the spiral gasket shown in FIGS. 4 and 5, both the spring force and the centering effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a spiral gasket showing one embodiment of the present invention.

FIG. 2 is a front view showing a state in which a spiral gasket is fitted in an exhaust pipe.

FIG. 3 is a front view of a spiral gasket showing another embodiment of the present invention.

FIG. 4 is a front view of a spiral gasket showing another embodiment of the present invention.

FIG. 5 is a partial sectional view of FIG. 4;

FIG. 6 is a front view of a conventional spiral gasket.

FIG. 7 is a sectional view of a conventional spiral gasket.

FIG. 8 is an explanatory view of a state in which a conventional spiral gasket is attached to a horizontal exhaust pipe.

FIG. 9 is an explanatory view showing a state in which the spiral gasket is attached to an inclined exhaust pipe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Metal hoop material 1a Hoop material portion to be cut and removed 1b Overlap portion due to folding of tip of hoop material portion 1c Mountain-shaped hoop material portion 1d Mountain-shaped hoop material portion 3 Weld fixing portion 4,5 Exhaust pipe 6,7 Flange 8 Bolt 9 Nut A Conventional spiral gasket

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hideaki Shimamoto 1-3-1 Onpaku, Higashi-ku, Hiroshima, Hiroshima Prefecture Inside Umex Co., Ltd. (72) Masaki Kawada 1-3-1 Onpaku, Higashi-ku, Hiroshima, Hiroshima Pref. (72) Inventor Shigeru Morita 1-8-21 Namamugi, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture (72) Michio Fujino 203-2-203, Kamiyabe-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture 203 (72) Yoji Hamasaki, creator 18-31 Tamate-cho, Sagamihara City, Kanagawa Prefecture

Claims (1)

[Utility model registration claims] In a manufacturing process of a spiral gasket formed by winding a hoop material around the inner circumference a plurality of times, the inner circumference side hoop material wound a plurality of times is raised in the circumferential direction to form a pipe outer circumference. A spiral gasket, wherein a hoop material portion acting as a spring elastically abutting against a surface is formed, and a base end portion of the hoop material portion acting as the spring is fixed by welding.