Nippon Pillar Packing Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Yuji Yanagitake

Hiroki Tanabe

Yuta Sato

Naoyuki Sawamoto

Kiyoshi Toyazaki

Osamu Sawai

Takato Ishihata

Provided is a spiral wound gasket that has improved conformability and that is capable of exhibiting sufficient sealability for flanges provided at joints, irrespective of the state of a gap between the flanges. The present invention provides a spiral wound gasket in which a laminate of a hoop member made of metal and a filler member is wound and integrated so as to have an opening at the center, where a bending angle constituting the bent portion is &#x3b1; (&#xb0;), and a radius of curvature of the bent portion is r (mm).

Spiral wound gasket

Provided is a spiral wound gasket that makes it less likely that gaps that are in communication with each other in a spiral shape will remain between layers of a filler member exposed at a gasket face in a state before the gasket is clamped and that is capable of exhibiting sufficient sealability for flanges provided at pipe joints. The present invention provides a spiral wound gasket in which a laminate of a hoop member made of metal and a filler member is wound around an opening and integrated, and which has gasket faces at respective end portions, wherein, at each of the gasket faces, an end portion of the filler member protrudes past an end portion of the hoop member, and the gasket faces have a surface roughness Rof 30 &#x3bc;m to 200 &#x3bc;m.

A gasket in which a high sealing property can be ensured, and a method of producing such a gasket are provided. A gasketis produced by spirally winding a belt-like composite bodyhaving a metal mesh memberand expanded graphiteenveloped by the metal mesh member, and then compression molding the composite body into a tubular shape. The gasket includes a first sealing portionplaced in one axial end portion, and a second sealing portionplaced in the other axial end portion. The gasket has a sectional shape in which the composite body that is in a bent state overlaps in a radial direction. The composite body includes a bent portion which is radially bent in an acute angle shape.

Gasket and method of producing gasket

A method of producing a gasket in which burrs can be prevented from being formed, and a mold failure can be suppressed, and a gasket are provided. A method of producing a gasket includes: a step Sof preparing a metal mesh member and expanded graphite; a step Sof placing the metal mesh member around the expanded graphite in a manner that a long belt-like composite body in which the expanded graphite is enveloped by the metal mesh member is formed; a step Sof adjusting the shapes of longitudinal end portions of the composite body in a manner that, in the short-side direction of the composite body, the width dimensions of the longitudinal end portions of the composite body are smaller than the width dimension of a longitudinal middle portion of the composite body; a step Sof spirally winding the composite body in a manner that a tubular body in a multiply wound state in which an axial direction coincides with the short-side direction of the composite body is formed; and a step Sof compress molding the tubular body in the axial direction of the tubular body.

Method of producing gasket and gasket

A gasket in which a high sealing property can be certainly ensured is provided. A gasketis to be interposed between a first flangeof a first exhaust pipeand a second flangeof a second exhaust pipein a state where the gasket is fitted onto an end portion of the first exhaust pipe, in order to seal a gap between end portions of the first and second exhaust pipesThe gasketincludes a first sealing portionand a second sealing portion. The first sealing portion has a first butting surfacehaving a tapered shape corresponding to a tapered shape of a first tapered inner circumferential surfaceof the first flange, and a first projecting portion. The first sealing portion is formed in a radially outer side of the gasket. The second sealing portion has a second butting surfacehaving a tapered shape corresponding to a tapered shape of a second tapered inner circumferential surface of the second flange, and a second projecting portion. The second sealing portion is formed in a radially outer side of the gasket.

Growing community of inventors

Osaka, Japan

Yuji Yanagitake