Nok Corporation

Ryoko Saito

Takeshi Watanabe

Shinya Nakaoka

Isao Tanji

Kazuya Aihara

Tomoyuki Koyama

A metal gasket includes: a straight section provided with a bolt hole; a bead section raised from an inner peripheral edge of the straight section toward one side of the direction of the thickness of the gasket; and a bent section bent from an outer peripheral edge of the straight section toward the other side of the direction of the thickness of the gasket. When metal gasket is compressively sandwiched by a pair of housings, bead section elastically deforms to decrease height, and straight section elastically deforms, whereby the inner peripheral edge of the straight section contacts one of the housings, the outer peripheral edge of the straight section contacts the other housing, and the bent section contacts the one of the housings. A gasket installation determination projection is part of the periphery and provided on the outer peripheral edge of the bent section or of the straight section.

Metal gasket

A gasketis configured to seal a gap between an installation memberand a fixation memberwhich are fixed to each other. The gaskethas an annular gasket main bodyconfigured to be fitted into an annular grooveprovided in the installation memberand configured to be in close contact with a bottom surfaceof the annular grooveand with an end surfaceof the fixation member, and an auxiliary seal portionextending from the gasket main bodytoward an opposite region, which is opposite to a sealed region. The auxiliary seal portionis configured to be in close contact with an end surfaceof the installation memberon the opposite region side of the annular grooveand with the end surfaceof the fixation member

Gasket and sealing structure

The present invention addresses the problem of providing: a metal gasket capable of limiting the loss of axial bolt fastening force even if a peripheral creased section is formed as an anti-saline intrusion measure; and a metal gasket, which has relatively small curved sections with a radius of curvature of not more than 20 mm on the outer edge and which is capable of limiting loss of axial bolt fastening force even when a peripheral creased section is formed over the entire perimeter of the metal gasket as an anti-saline intrusion measure. Said problem is solved by a metal gasket, which is disposed between the abutting surfaces of two members and has, on a metal base plate: bolt holes into which bolts are inserted; a bead that is to the inside of the bolt holes and is for sealing between the abutting surfaces; and a peripheral creased section configured by bending the perimeter of the metal base plate in one direction so that no gap in which saline can accumulate is formed between the abutting surfaces. The peripheral creased section has areas formed by gradually changing bend length in the gasket circumferential direction so that loss of axial bolt fastening force when compressed by bolts is limited.

Growing community of inventors

Fukushima, Japan

Ryoko Saito