Nok Corporation

Kazuki Takeno

Shinobu Munekata

Ichiro Yamane

Akira Yamaguchi

Hiroki Matsui

Toshihiro Higashira

Masayuki Tanida

Yosuke Kondo

Shuji Yoshitsune

Hirotaka Mizuta

Masatoshi Okada

Iwao Taira

Tadashi Abiko

Takashi Nakao

Kenichi Kunieda

Katsumi Yamashina

Masaru Watanabe

Hideyuki Huruyama

Tatsuhiko Watanabe

Tomohisa Matsumoto

Hidenori Arai

Tadashi c/o Nok Corporation Abiko

Masatoshi c/o Nok Corporation Okada

Iwao c/o Nok Corporation Taira

Yosuke c/o Nok Corporation Kondo

Ichiro c/o Nok Corporation Yamane

A high performance sealing device having an excellent pressure resistance and realizing a prevention of damage. The sealing device usable at a working pressure of 0 to 2 MPa, and not damaged even if the pressure of high-pressure fuel of 5 MPa or higher is applied thereto, wherein high pressure fuel on the high pressure side is sealed by a first seal part, oil from a cam side on a low pressure side is sealed by a second seal part, and the fuel slightly leaked due to failure of scraping at the first seal part is sealed by the second seal part to form a dual seal structure. A resin ring coming into slidable sealing contact with a shaft is used in the first seal part, whereby abnormal abrasion does not occur even when fuel having less lubricity is used, and the durability of the seal is increased.

Sealing device

A first gasketis placed in a groove formed in a cam cover and seals a gap between a cylinder head and the cam cover. The first gasketincludes a pair of seal lipswhich come into tight contact with the cylinder head and which are provided in parallel to each other, and a plurality of connecting portionswhich are provided between the pair of seal lips, which are connected to each of the seal lips, and which hold a distance between the seal lipsnear the connected portion.

Gasket

A reciprocating seal used, for example, for a shock absorber. A main seal lip has a two-step lip structure including a first lip and a second lip and a plurality of protrusions extending in the direction of the shaft are formed on a sliding contact surface of the second lip, thereby improving frictional force characteristics and, at the same time, improving sealing performance.

Reciprocating seal

This invention provides an oil seal that can maintain an excellent friction reduction function over a long period of time, has excellent abrasion resistance, and further has excellent sealing properties. The oil seal comprises a seal lip () formed of a rubber-like elastic material comprising a lip edge part () and an air-side slope () and a sealing fluid-side slope () provided on both sides of the lip edge part (). The air-side slope () has a coating film () on its surface. In the lip edge part () in its portion in contact with a shaft (), a sealing fluid-side rubber part (') and an air-side coating film () are simultaneously brought into contact with the shaft (). The coating film () is preferably formed of a coating agent comprising a fluororesin, a polyethylene resin, an isocyanate-modified polybutadiene resin, and a solvent.

Oil seal and process for producing the same

Growing community of inventors

Fukushima, Japan

Kazuki Takeno