Nichias Corporation

Honda Motor Co., Ltd.

Hideaki Mori

Kanji Hanashima

Kenichi Takahiro

Tomokazu Watanabe

Nahoko Kitajima

Hideshi Shibata

Hideharu Aoyagi

Jun Oikawa

Hirotaka Natori

Jun Tachiki

You Nakajima

Mai Fujiwara

Toshihiro Oikawa

A coating agent for a rubber-coated cylinder head gasket contains a lubricant and a urethane resin. The lubricant is unsintered polytetrafluoroethylene resin particles having an average primary particle size of 1 &#x3bc;m or less. The amount of the unsintered polytetrafluoroethylene resin particles in a solid content is 30 to 80% by volume. The present invention provides a coating agent for a rubber-coated cylinder head gasket that can form a coat that is highly wear-resistant under high contact pressure and high temperature conditions and with which a rubber layer is less likely to stick to the seal face of the cylinder block or the cylinder head after the use under high contact pressure and high temperature conditions, and a cylinder head gasket obtained using the coating agent.

Coating agent for rubber-coated cylinder head gasket and cylinder head gasket

A coating agent includes a polyurethane and a hydrocarbon-based synthetic wax.

Coating agent

An outer ring of a clamp-type joint for vacuum apparatus is disclosed. The joint includes a base forming an outer circumferential side and a pair of brims respectively extending from the top and bottom of the base toward the center axis of the joint, the inner side of the brims on which the brims come into contact with the O-ring being in the form of a convex sector, of which the arc faces the O-ring. The radius r of the circle forming the sector is 0.6-2.5 mm and the thickness (t) satisfies the following formula: t&#x2212;0.2&#x2266;t&#x2266;t+0.4. In the formula, tis a thickness (mm) of the center ring at the point at which the center ring engages with the O-ring. The clamp-type joint can exhibit stable sealing performance at a high temperature of 250&#xb0; C. or more without cracking of the O-ring.

Outer ring and clamp-type joint for vacuum apparatus

An O-ring used in a clamp-type joint for a vacuum apparatus, which engages with a concave groove in the outer circumference edge of the center ring and is sandwiched by an outer ring having a U-shaped outer circumference, wherein the radius of the circular arc in the cross-section on the side coming into contact with the outer ring is smaller than the radius of the circular arc in the cross-section on the axial side of the joint. A clamp-type joint for the vacuum apparatus which can exhibit stable sealing performance at a high temperature of 200&#xb0; C. or more without cracking of the O-ring, as well as an outer ring and O-ring used with the clamp-type joint are also provided.

O-ring and clamp-type joint for vacuum apparatus

The present invention provides a combination metal gasket that is formed by fitting a ring-shaped metal base elastic structure in at least one trough portion of two trough portions of a ring-shaped metal gasket that has an S-shaped longitudinal cross section. The combination metal gasket does not demonstrate the plastic deformation even when a large compressive load is applied and is not likely to be destroyed even when a pressure of a fluid being sealed is high; that is, stable sealing properties are exhibited.

Combination metal gasket and seal structure

To obtain a gasket holding device which is unlikely to slip out of a bolt and facilitates mounting of the bolt thereon, a bolt mounting hole made in a metal plate constituting the gasket holding device is provided with an engaging portion which engages the bolt. This engaging portion is formed by processing part of the metal plate on the bolt mounting hole thinly such that it is elastically deformed and projected in between a crest and a root of the bolt.

Gasket holding device

In order to provide a gasket which can be repeatedly used over a temperature range in which a rubber gasket cannot be used, which does not have any risk of damaging a flange, and which can follow the change of the distance between flanges, a gasket is constructed in such a way that two metallic coned disc springs each of which has a circulation opening for a fluid in a central portion and each of which is formed into a seal surface in which an outer peripheral portion with respect to the circulation opening rises having an arc-like curved surface are combined while being oppositely directed and have outer diameter peripheral edge portions which are welded and fixed so that by tightening flanges, repulsive force of the two coned disc springs concentratedly affects the seal surfaces consisting of the arc-like curved surfaces, and a tight fluid seal is formed between the flange surfaces.

Growing community of inventors

Hamamatsu, Japan

Hideaki Mori