Nok Corporation

Hideya Watanabe

Yusuke Yoshida

Koji Watanabe

Yosuke Kondo

Kazunari Seki

Hirotaka Mizuta

Fangman Xu

Yuki Takao

Wataru Tokunaga

Keisuke Nakashima

Takuya Igawa

Masatoshi Seki

A circular annular seal ring made from a resin is adapted to be disposed between an outer member and an inner member that rotate relative to each other. The seal ring is disposed in a circumferential groove of the outer member or the inner member to isolate a liquid space from an external space. The seal ring is formed from an elongated and arcuate rod to define a circle by joining ends of the rod, and has a junction formed from the ends. The seal ring has a radial thickness gradually decreasing from two points that are apart from the junction toward the junction. The points are separated from the junction by an angle of not less than 60 degrees and not more than 150 degrees about a central axis of the circle.

Seal ring

A recessed part formed on a side surface includes a dynamic pressure part extending in the circumferential direction to converge on the side surface, and an introduction part extending from the dynamic pressure to open the dynamic pressure part toward the inner periphery side. One or two inner peripheral wall parts are provided for each of the recessed parts. The inner peripheral wall part is a portion defined on the inner periphery side of the corresponding recessed part by the dynamic pressure part and the introduction part. The inner peripheral wall part includes an inner peripheral wall surface. The inner peripheral wall surface extends toward the introduction part in the circumferential direction with inclining with respect to the side surface such that the inner peripheral wall surface is depressed from the side surface.

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

A seal ringis configured by the combination of a first divided bodyA on a high pressure side and a second divided bodyB on a low pressure side with respect to an axis direction. The seal ring that stabilizes sealing performance while reducing rotary torque and including a recessed sectionprovided centrally in a width direction and extending in a circumferential direction and a pair of raised sectionsprovided on both sides of the recessed section. A through holea is provided so as to lead to a bottom surface of the recessed sectionfrom an inner peripheral surface side and allows a sealed fluid to be introduced into the recessed sectionfrom the inner peripheral surface side.

Growing community of inventors

Kitaibaraki, Japan

Hideya Watanabe