Nok Corporation

Mahle Filter Systems Japan Corporation

Masaru Ito

Shinya Nakaoka

Isao Tanji

Takanori Anzai

Shota Toma

Tomoyuki Koyama

Kazuya Aihara

Shuji Yoshitsune

Seiji Tani

Katsuma Imai

Hirotaka Muragishi

Nobutake Matsuki

Syuji Yoshitsune

A heat-resistant gasket is provided with a first coating plate in which an annularly continuous emboss portion is formed and which is made of metal, a second coating plate which is arranged so as to face to the first coating plate in a thickness direction and is brought into close contact with a convex surface of the emboss portion, in which end portions in an inner peripheral side of the emboss portion are connected in a state of being in close contact with and lapped over the first coating plate and which is made of metal, and an expanded graphite core which is pinched between the first coating plate and the second coating plate, in a portion between the emboss portion and the overlapped portion of the end portions. Therefore, excellent sealing performance can be maintained even under a high-temperature environment while preventing stress relaxation due to heat.

Heat-resistant gasket

A seal structure has one metal gasket arranged between a pair of casings. The metal gasket is provided with a planate outer peripheral portion and a bead portion which is formed by rising up from an inner peripheral end portion of the outer peripheral portion, and is arranged so that the bead portion comes into contact with the one casing, and the outer peripheral portion comes into contact with the other casing. The bead portion elastically deforms so as to reduce its height and the outer peripheral portion elastically deforms on the basis of the elastic deformation of the bead portion, when the metal gasket is pinched by the pair of casings, and a leading end of the outer peripheral portion comes into contact with one casing at this time, whereby any gap in which salt water stays is not formed between one casing and the metal gasket.

Seal structure using metal gasket

Provided is a seal bead structure of a gasket capable of reducing the reactive force generated in a common bead portion provided between multiple through-holes and thereby capable of achieving a stable sealing function by means of aligning the compression property over the entire bead. In order to achieve this, two through-holes are provided in a row in the flat portion of a metal gasket, with one seal bead provided on the edge of one through-hole, the other seal bead provided on the edge of the other through-hole, and a common bead portion for the both seal beads provided in the intermediate position between the both through-holes, the common bead portion having a two-stage half bead shape in which the half beads are formed on two stage in the same direction.

Seal bead structure of gasket

A seal structure has a metal gasket arranged between a pair of casings. The metal gasket is provided with a bead portion in an inner peripheral side of a planate outer peripheral portion, and a bent portion in an outer peripheral side. When the metal gasket is pinched by a pair of casings, the bead portion elastically deforms so as to reduce its height and the outer peripheral portion elastically deforms on the basis of the elastic deformation of the bead portion, and comes into contact its outer peripheral end portion with one casing, whereby any gap in which salt water stays is not formed between one casing and the outer peripheral portion, and the bent portion comes into contact with the other casing, whereby any gap in which the salt water stays is not formed between the other casing and the outer peripheral portion.

A gasket is provided which is intended to improve its sealing performance by attaining a further stabilization of the posture thereof in a groove. In a gasket () in which a protruded part (), which serves to stabilize the posture of the gasket () in a groove () by being in contact with an inner wall surface of the groove () in a state where the gasket is sandwiched by a head cover () and a cylinder head, is continuously formed in a longitudinal direction of the gasket (), the protruded part () is characterized by a stepped structure which includes a first protruded portion () with the largest amount of protrusion that is formed along the vicinity of a center of a gasket main body, a second protruded portion () with the smallest amount of protrusion that is formed at the side of the head cover (), and a third protruded portion () that is formed at the side of the cylinder head, and has an amount of protrusion which is smaller than that of the first protruded portion (), and larger than that of the second protruded portion ().

Gasket

The process for producing gaskets includes the steps of: forming a metal core material () using a stainless steel plate; treating the resulting metal core material () with an alkali treating solution; preparing an unvulcanized rubber molded product (); mounting the metal core material () treated in the treating step to the unvulcanized rubber molded product (); and vulcanizing the rubber-molded product to thereby anchor the elastic material to the metal core material () without using an adhesive; characterized in that the alkali treating solution used in the step of alkali treatment includes the following components (A), (B), and (C):

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Makinohara, Japan

Masaru Ito