Nok Corporation

Hirotaka Mizuta

Hiroki Matsui

Koji Watanabe

Yusuke Yoshida

Yosuke Kondo

Kazunari Seki

Fangman Xu

Hideya Watanabe

Yuki Takao

Wataru Tokunaga

Takuya Igawa

Keisuke Nakashima

Masayuki Tanida

Toru Nakashima

Shinya Omoto

Yusuke Kamiya

Akira Yamaguchi

Yuki Sato

Toshihiro Higashira

Hideyuki Furuyama

Shinobu Munekata

Kazuki Takeno

Ken Yoshikawa

Kenichi Kunieda

Hideyuki Huruyama

Tatsuhiko Watanabe

A sealing structure with an annular pocket and a sealing device includes an annular pocket and a sealing device. The pocket is provided in a slinger, and the sealing device is attached to a housing of a differential device. The slinger is arranged on an output shaft of the differential device. A recessed part of the pocket is defined by an inner peripheral tubular portion, an outer peripheral tubular portion and a bottom portion of the slinger. The outer peripheral surface of the pocket is formed in the outer peripheral tubular portion of the slinger. The outer peripheral surface of the pocket increases in diameter toward the outside in an axis direction. A side lip of the sealing device extends in the outward direction, and an annular gap is formed between the side lip and the pocket.

Sealing structure with annular pocket and sealing device

A sealing structure with a torsional damper and an oil seal includes a damper pulley serving as a torsional damper and an oil seal. The damper pulley has an annular hub pocket that is recessed in the outer side direction and extends in the circumferential direction along a boss part of a hub. The oil seal includes a side lip that extends toward the outer side. An outer circumferential surface of the hub pocket increases in a diameter toward the outer side, the side lip of the oil seal does not enter inside the hub pocket, and an annular gap is formed between an outer side end of the side lip and an inner side end of the outer circumferential surface of the hub pocket.

Sealing structure with torsional damper and oil seal

The sealing device includes: an outer peripheral ringthat is in contact with a side wall surface of an annular grooveat a low pressure side (L), and slides with respect to an inner peripheral surface of a shaft hole in a housingthrough which a shaftis inserted. An inner peripheral ringmade of a rubber-like elastic body that is in contact with an inner peripheral surface of the outer peripheral ringand a groove bottom surface of the annular groove, respectively. The outer peripheral ringis formed on its outer peripheral surface with a concave portionwhich extends from an end of a high pressure side (H) to a position which does not arrive at an end of a low pressure side, so as to introduce fluid thereinto from the high pressure side.

Sealing device

Sealing device and sealing structure

For an oil seal () having a seal lip () with a slope () at the side of sealed fluid and a slope () at the side opposite to the sealed fluid, and a screw section () provided on the slope () for pushing back sealed fluid by a pumping effect at a time of rotation, in order to achieve low torque characteristics based on fluid lubrication by increasing the thickness of an oil film on sliding surfaces, an intermediate surface () is provided between the slopes (), and an oppositely threaded screw section () for sucking the sealed fluid by a pumping effect is provided on the intermediate surface () without reaching the boundary () between the intermediate surface () and the slope (), so that a threadless region is provided in the entire circumference between the screw section () and the boundary ().

Oil 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

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Fujisawa, Japan

Hirotaka Mizuta