Eagle Industry Co., Ltd.

Yasuhiro Kuroki

Tetsuya Iguchi

Yuichiro Tokunaga

Hideyuki Inoue

Wataru Kimura

Hidetoshi Kasahara

Jun Hiromatsu

Ryu Kikuchi

Toru Kono

Kazuhiro Iwashita

Akira Urabe

In an exemplary embodiment, a seal device () that seals between a housing () and a rotation shaft () passing through the housing () includes: a floating ring () arranged with a gap h with respect to the rotation shaft (), a seal portion () formed by bringing one end face of the floating ring () into contact with the housing (), and a space portion j provided between the floating ring () and the housing (), and the floating ring () includes bias means that contactlessly biases the floating ring () to the seal portion via the space portion j. The seal device in which the floating ring follows movement of the rotation shaft is capable of exerting a sealing operation so that vibration of the rotation shaft can be reduced.

Seal device

A segment seal is configured to seal an annular clearance between a housing and a rotary shaft in a state in which a pair of seal rings are attached in an unrotatable state between one end portion of the housing and a support member attached to the housing so as to be opposite to the one end portion in an axial direction. The segment seal includes an anti-rotation member placed not to rotate relative to the housing or the support member, provided with a pair of raised portions fitted to the pair of seal rings to prevent rotation of the pair of seal rings, and configured such that at least one of the raised portions has a shape fittable only to either one of the seal rings.

Segment seal

A sealing device includes a floating ring in a space between the outer circumference of a rotating shaft and the inner circumference of a housing, and a multi-layered cylindrical body including a plurality of elastically deformable cylindrical thin plates layered on top of each other provided between an outer peripheral surface of the floating ring and an inner peripheral surface of the housing, so as to impart a radial restoring force against the eccentricity of the rotating shaft to restore it to its center position, and a tangential damping force to reduce the whirling of the rotating shaft.

In an exemplary embodiment, a seal devicethat seals between a housingand a rotation shaftpassing through the housingincludes a floating ringarranged with a gap h with respect to the rotation shaft, wherein the floating ringincludes at least one supporting meansthat supports in the circumferential direction. In the seal device, the floating ring follows movement of the rotation shaft even upon running for a long time, a clearance between the rotation shaft and the seal ring can be properly held, and the sealing operation by the floating ring and the vibration damping function can be exerted, and the seal device is easily assembled.

Provided is a sealing device that increases the lubricity of seal surfaces, prevents leakage of sealed fluids, and prevents excessive heat generation and excessive friction at seal surfaces. Said sealing device, which is of the type that seals a fluid trying to leak from the outer periphery of a sealing surface towards the inner periphery thereof, forms at least two dimples in a circumferential direction in each of a plurality of rows arranged in a radial direction on a sealing surface of a stationary-side sealing element or a rotating-side sealing element. Each dimple is tilted by a dimple angle &#x3b8; between 0&#xb0; and 90&#xb0;, exclusive, such that the tip of that dimple in the direction of rotation is tilted toward the inner periphery side. In each of the plurality of rows of dimples, land areas are formed in the circumferential direction between the proximate tips of adjacent dimples. For each of the plurality of rows of dimples, if a circle is drawn through the centers of the dimples in that row, let Lbe the distance along the circle from the point the circle enters a dimple to the point the circle leaves that dimple, and let Lbe the length, along the circle, of the land areas between dimples. The dimples are characterized by being arranged such that the gap ratio L/Lis between 0.001 and 0.1, inclusive.

Sealing device

Provided is a segmented seal that is capable of suppressing the progress of wear in a key groove and thereby attains improvement in the durability of a seal ring. The segmented seal includes a key groove (), as seen in an axial direction, has a groove body portion () extending in a radial direction and a pair of clearance groove portions () expanding to both sides of the groove body portion () so as to be away from a key () on the inner peripheral surface side, and among the pair of clearance groove portions (), the clearance groove portion () on an upstream side in a rotating direction &#xae; of the rotating shaft () is configured to expand to an outer peripheral surface side beyond a tip end () on an inner peripheral surface side of the key ().

Growing community of inventors

Tokyo, Japan

Yasuhiro Kuroki