Nippon Pillar Packing Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Toyoda Jidosha Kabushiki Kaisha

Masahiko Takaoka

Takeshi Miyoshi

Keiji Okada

Shingo Hoshikawa

Hideo Yahagi

Takahisa Ueda

Akira Hashimoto

Hideto Hashiguchi

Masao Konaka

Shoji Kato

A method of producing a spiral wound gasket for sealing fluid such as a liquid including water and oil, and a gaseous body including vapor and gas and a device for producing the spiral wound gasket. The tip portion of a hoop material is cut and raised thereby forming a checking stepped-portion. The checking stepped-portion is caught by a checking pawl, so as to wind the hoop material around a core drum. After winding the hoop material around the outer periphery of the core drum, at least once, the checking pawl is retracted from the outer periphery of the core drum, thereby separating the checking pawl from the checking stepped-portion. The spiral wound gasket produced by the present invention exhibits an excellent sealing property. Moreover, it also has an excellent durability.

Method of producing a spiral wound gasket and a device for producing the same

The composite gasket of the present invention has improved various properties which are different depending on use conditions, while ensuring sealing properties, by combining a seal material which is selected in accordance with the properties of certain sheet-like seal materials in a substrate. The composite gasket is configured by forming a plurality of slits in a surface of the sheet-like seal materials the slits extending in a thickness direction of the materials, and loading a seal material composed of a substance which is different from a material constituting the sheet-like seal material into the slits and the surface of the seal material.

Composite gasket

A vortex gasket for automotive exhaust system, preferably used with a special flange having a conical seal surface, is formed by spirally overlaying a metal hoop (2) of flat strip, and an inorganic filler (3) of tape form, and annularly spot welding a winding start portion (2a) and a winding end portion (2b) of the hoop (2) to itself. The tape form of the inorganic filler is wider than the flat strip of the metal hoop so that edges of the inorganic filler form seal contact surfaces spaced beyond edges of the metal hoop. When an external force is applied in the axial direction, slipping occurs between the hoop (2) and the filler (3), and the gasket is telescopically deformed in the axial direction, so that the seal contact surfaces 1a, 1b, at sides of the gasket, are formed in a conical shape.

Vortex gasket for automotive exhaust system

Vortex gasket for automative exhaust system

A filler material for spiral gaskets has: 36.5 weight percent or more fibrous material, composed of 5 to 20 weight percent ceramic fibers, 13.5 to 25 weight percent sepiolite and 1 to 10 weight percent organic fibers; 59 weight percent or less inorganic powder; and 1 to 10 weight percent organic polymeric binder. The filler material of the present invention may be used as a substitute for conventional asbestos filler material in spiral gaskets and is superior to asbestos filler material in heat resistance.

Filler materials for spiral gaskets

Growing community of inventors

Sanda, Japan

Masahiko Takaoka