Nok Corporation

Eagle Industry Co., Ltd.

Ken Yoshikawa

Yuki Sato

Yasuhiro Ikeda

Hiroki Matsui

Masayuki Tanida

Satoshi Yamanaka

Hideyuki Furuyama

Yasushi Sugiyama

Shinji Nagasawa

Hirotaka Mizuta

Hiroyuki Nikamoto

Shinobu Munekata

Kiichiro Goto

Yoshiyuki Kanzaki

Yasunari Hamaya

Koichi Mizunoya

Tatuhiko Watanabe

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

To make it unnecessary to insert a plate spring as a separate part between a metal ring () and a mating member () to be coupled therewith such as a clutch plate, and reduce the number of parts and the assembly manhours, the sealing device () includes the metal ring () and seal sections () such as packings supported by the metal ring (), and the metal ring () is provided with a intimate-contact region () for intimately contacting to the mating member () to be coupled, wherein the sealing device () is characterized in that the intimate-contact region () of the metal ring () is integrally formed with pawl-like intimate-contact sections () which are in the form of a pawl and which exert spring force on the mating member () to be coupled, and is used, for example, as a bonded piston seal (BPS) in an automatic transmission.

Sealing device

A sealing apparatus has a metal ring having a cylindrical portion and an inward flange portion bending from the open-air side end of the cylindrical portion radially inward; a first sealing member formed integral with the metal ring, and having a first rubber-like sealing lip, and a flange-shaped interposed portion held between the inward flange position of the metal ring and the radial portion of the first sealing member. A second sealing member made of a resin material, extends from the inside-diameter end of the interposed portion axially toward the sealing liquid side, and is located in a gap between the open-air side surface of the first sealing lip and a rotary member, having the inner periphery thereof in slidable close contact with the surface of the rotary member, and regulates radial deformation of the first sealing lip. A screw pumping portion is provided to transport the liquid between the sliding surfaces to the sealing liquid side on rotation of the rotary member.

Sealing apparatus

Growing community of inventors

Fukushima, Japan

Ken Yoshikawa