JP2006071058A - Sealing device - Google Patents

Sealing device Download PDF

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JP2006071058A
JP2006071058A JP2004258218A JP2004258218A JP2006071058A JP 2006071058 A JP2006071058 A JP 2006071058A JP 2004258218 A JP2004258218 A JP 2004258218A JP 2004258218 A JP2004258218 A JP 2004258218A JP 2006071058 A JP2006071058 A JP 2006071058A
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seal
sealing device
ring
seal ring
elastic ring
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Japanese (ja)
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Tadashi Yokoyama
正 横山
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Nok Corp
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Nok Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device 10 capable of preventing slide of an elastic ring 2 and a bottom face 112a of an annular channel 112 to provide stable sealing property for a long time. <P>SOLUTION: This sealing device 10 is stored in the annular channel 112 formed on an inner peripheral face of a shaft hole of a housing 110. This sealing device is provided with a seal ring 1 coming into close-contact with an outer peripheral face 121 of a rotary shaft 120 inserted into the inner periphery of the housing 110 concentrically and rotatably so as to slide and made of low friction resin and the elastic ring 2 made of a rubber-like elastic material fitted in the seal ring 1 in a condition in which it is polymerized in the radial direction. A seal protruding bar 22 extending in the circumferential direction and many projections 23 formed at a predetermined interval in the circumferential direction are provided on an outer peripheral face of the elastic ring 2. These seal protruding bar 22 and projections 23 are brought into pressure-contact with the bottom face 112a of the annular channel 112 with proper crushing allowance. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、機器の回転部分を密封する密封装置であって、特に、低摩擦樹脂材からなるシールリングをゴム状弾性材料からなる弾性リングで支持してなるものに関する。   The present invention relates to a sealing device for sealing a rotating part of an apparatus, and more particularly to a sealing device in which a seal ring made of a low friction resin material is supported by an elastic ring made of a rubber-like elastic material.

従来、例えば連続鋳造機の軸受部分で低速回転の回転軸を密封する密封装置としては、下記の特許文献1に開示されたようなものが公知である。
特開昭60−84478号公報
2. Description of the Related Art Conventionally, as a sealing device that seals a rotating shaft that rotates at a low speed, for example, at a bearing portion of a continuous casting machine, a device disclosed in Patent Document 1 below is known.
JP 60-84478 A

図3は、特許文献1に記載された従来の密封装置を、その軸心を通る平面で切断して示す装着状態の断面図で、参照符号110はハウジング、120はハウジング110の軸孔111に挿通されて不図示の軸受により同心的かつ回転可能に支持された回転軸である。ハウジング110の軸孔内周面には、軸心を通る平面で切断した断面が矩形状を呈する環状溝112が形成されており、この環状溝112に、密封装置100が装着されている。   FIG. 3 is a cross-sectional view of the conventional sealing device described in Patent Document 1 in a mounted state by cutting along a plane passing through the axis thereof. Reference numeral 110 denotes a housing, and 120 denotes a shaft hole 111 of the housing 110. The rotating shaft is inserted and supported concentrically and rotatably by a bearing (not shown). On the inner peripheral surface of the shaft hole of the housing 110, an annular groove 112 having a rectangular cross section cut by a plane passing through the shaft center is formed, and the sealing device 100 is attached to the annular groove 112.

密封装置100は、PTFE(ポリテトラフルオロエチレン)等の低摩擦合成樹脂材からなるシールリング101と、ゴム状弾性材料からなる弾性リング102とから構成される。シールリング101は、内周面101aが回転軸120の外周面121に摺動可能に密接され、弾性リング102は、内周面102aがシールリング101の外周面101bに径方向に重合した状態に密接嵌合されると共に、外周面に、円周方向へ連続した複数のシール突条102bが形成されており、このシール突条102bが、ハウジング110の環状溝112の底面112aに、適当なつぶし代をもって圧接されている。そしてこのような構成によって、ハウジング110と回転軸120の間の軸周隙間Gが密封され、軸受側の流体の漏れや外部から軸受へのダストの侵入が防止される。   The sealing device 100 includes a seal ring 101 made of a low friction synthetic resin material such as PTFE (polytetrafluoroethylene) and an elastic ring 102 made of a rubber-like elastic material. The seal ring 101 is in close contact with the outer peripheral surface 121 of the rotating shaft 120 so that the inner peripheral surface 101a is slidable, and the elastic ring 102 is in a state where the inner peripheral surface 102a is overlapped with the outer peripheral surface 101b of the seal ring 101 in the radial direction. A plurality of seal ridges 102 b that are closely fitted and circumferentially continuous are formed on the outer peripheral surface, and these seal ridges 102 b are appropriately crushed on the bottom surface 112 a of the annular groove 112 of the housing 110. It is pressed with a generation. With such a configuration, the shaft circumferential gap G between the housing 110 and the rotating shaft 120 is sealed, and leakage of fluid on the bearing side and intrusion of dust from the outside to the bearing are prevented.

しかしながら、上記従来の密封装置100によれば、本来は、シールリング101の内周面101aが回転軸120の外周面121と摺接されるものであるが、弾性リング102の外周面に形成されたシール突条102bが円周方向へ延びるものであり、言い換えれば、回転軸120との摺動に伴ってシールリング101から伝達される回転力の方向へ延びるものであるから、ハウジング110に形成した環状溝112の底面112aに対する弾性リング102の摩擦力が比較的小さい。このため、特に連続鋳造機のような低速回転の条件では、前記回転力によって、弾性リング102が環状溝112の底面112aと摺動してしまうおそれがあり、この場合はシール突条102bの摩耗によってそのつぶし代が減少するため、シールリング101への径方向の押付力が低下して、早期に密封性の低下を来すことが懸念される。   However, according to the conventional sealing device 100, the inner peripheral surface 101a of the seal ring 101 is originally slidably contacted with the outer peripheral surface 121 of the rotating shaft 120, but is formed on the outer peripheral surface of the elastic ring 102. Since the seal protrusion 102b extends in the circumferential direction, in other words, extends in the direction of the rotational force transmitted from the seal ring 101 as it slides on the rotation shaft 120, it is formed in the housing 110. The frictional force of the elastic ring 102 against the bottom surface 112a of the annular groove 112 is relatively small. For this reason, the elastic ring 102 may slide with the bottom surface 112a of the annular groove 112 due to the rotational force, particularly under the condition of low speed rotation such as in a continuous casting machine. In this case, the seal ridge 102b is worn. Therefore, there is a concern that the pressing force in the radial direction against the seal ring 101 is reduced and the sealing performance is deteriorated at an early stage.

本発明は、以上のような点に鑑みてなされたものであって、その技術的課題は、弾性リングと環状溝の底面との摺動を防止して、長期にわたって安定した密封性を奏し得る密封装置を提供することにある。   The present invention has been made in view of the above points, and its technical problem is that sliding between the elastic ring and the bottom surface of the annular groove can be prevented, and stable sealing performance can be achieved over a long period of time. It is to provide a sealing device.

上述した技術的課題を有効に解決するための手段として、請求項1の発明に係る密封装置は、互いに同心的かつ相対回転可能に配置された外周部材と内周部材の互いの対向周面のうちの一方に形成された環状溝に収納される密封装置であって、前記対向周面のうちの他方に摺動可能に密接される低摩擦樹脂からなるシールリングと、このシールリングに径方向に重合した状態に嵌着されたゴム状弾性材料からなる弾性リングとを備え、この弾性リングにおける前記シールリングと反対側の面に、円周方向へ延びるシール突条と、円周方向所定間隔で形成された多数の突起を有し、これらシール突条及び突起が適当なつぶし代をもって前記環状溝の底面に圧接されるものである。   As a means for effectively solving the technical problem described above, the sealing device according to the invention of claim 1 includes a circumferential member and an inner circumferential member, which are arranged concentrically and relatively rotatably with each other. A sealing device housed in an annular groove formed in one of the seal rings, and a seal ring made of a low friction resin slidably in contact with the other of the opposed peripheral surfaces, and a radial direction in the seal ring An elastic ring made of a rubber-like elastic material fitted in a polymerized state, and a seal protrusion extending in the circumferential direction on a surface opposite to the seal ring in the elastic ring, and a predetermined interval in the circumferential direction The seal protrusions and protrusions are pressed against the bottom surface of the annular groove with an appropriate crushing allowance.

この構成において、弾性リングは外周部材及び内周部材のうちの一方に形成された環状溝の底面に圧接されて、シールリングを前記外周部材及び内周部材のうちの他方の周面に摺接させるものであり、シールリングは、前記他方の周面と密封摺動機能を営むものである。弾性リングにおけるシールリングと反対側の面に形成された円周方向へ延びるシール突条は、環状溝の底面との間での密封性を向上させるものであり、円周方向所定間隔で形成された多数の突起は、環状溝の底面との摩擦トルクを上昇させて、環状溝に対する弾性リングの相対回転を防止するものである。   In this configuration, the elastic ring is pressed against the bottom surface of the annular groove formed in one of the outer peripheral member and the inner peripheral member, and the seal ring is slidably contacted with the other peripheral surface of the outer peripheral member and the inner peripheral member. The seal ring performs a sealing sliding function with the other peripheral surface. The seal ridges extending in the circumferential direction formed on the surface of the elastic ring opposite to the seal ring improve the sealing performance with the bottom surface of the annular groove, and are formed at predetermined intervals in the circumferential direction. The large number of protrusions increases the friction torque with the bottom surface of the annular groove to prevent relative rotation of the elastic ring with respect to the annular groove.

本発明に係る密封装置によれば、環状溝の底面に対する弾性リングの摩擦力が増大するので、シールリングから伝達される回転力によって弾性リングが環状溝の底面と摺動するのを有効に防止し、長期にわたって安定した密封性を奏することができる。   According to the sealing device of the present invention, since the frictional force of the elastic ring against the bottom surface of the annular groove increases, it is possible to effectively prevent the elastic ring from sliding on the bottom surface of the annular groove by the rotational force transmitted from the seal ring. In addition, stable sealing performance can be achieved over a long period of time.

以下、本発明に係る密封装置の好ましい実施の形態を、図面を参照しながら詳細に説明する。図1は、本発明に係る密封装置の好ましい実施の形態を、その軸心を通る平面で切断して示す装着状態の断面図、図2は、図1におけるII‐II'線位置で軸心と直交する平面で切断して示す半断面図である。   Hereinafter, preferred embodiments of a sealing device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a preferred embodiment of a sealing device according to the present invention cut along a plane passing through the axis thereof, and FIG. 2 is a sectional view taken along the line II-II ′ in FIG. FIG.

図1及び図2において、参照符号110は例えば連続鋳造機における軸受近傍のハウジング、120はハウジング110の軸孔111に挿通されて不図示の軸受により同心的かつ回転可能に支持された回転軸である。ハウジング110の軸孔内周面には、軸心を通る平面で切断した断面が矩形状を呈する環状溝112が形成されており、この環状溝112に、本発明に係る密封装置10が装着されている。なお、ハウジング110は請求項1に記載された外周部材に相当し、回転軸120は請求項1に記載された内周部材に相当するものである。   1 and 2, reference numeral 110 is a housing in the vicinity of a bearing in a continuous casting machine, for example, 120 is a rotating shaft that is inserted through a shaft hole 111 of the housing 110 and is supported concentrically and rotatably by a bearing (not shown). is there. An annular groove 112 having a rectangular cross section cut by a plane passing through the shaft center is formed on the inner peripheral surface of the shaft hole of the housing 110, and the sealing device 10 according to the present invention is attached to the annular groove 112. ing. The housing 110 corresponds to the outer peripheral member described in claim 1, and the rotating shaft 120 corresponds to the inner peripheral member described in claim 1.

この実施の形態による密封装置10は、摩擦係数が低く耐摩耗性に優れたPTFE(ポリテトラフルオロエチレン)等の低摩擦合成樹脂材からなるシールリング1と、ゴム状弾性材料からなる弾性リング2とから構成される。シールリング1は、円筒面状をなす内周面11が、ハウジング110の軸孔111よりも小径であって、回転軸120の外周面121に摺動可能に密接され、弾性リング2は、内周面21がシールリング1の外周面12に径方向に重合した状態で、適当な面圧で密接嵌合されている。   The sealing device 10 according to this embodiment includes a seal ring 1 made of a low friction synthetic resin material such as PTFE (polytetrafluoroethylene) having a low friction coefficient and excellent wear resistance, and an elastic ring 2 made of a rubber-like elastic material. It consists of. The seal ring 1 has a cylindrical inner peripheral surface 11 having a smaller diameter than the shaft hole 111 of the housing 110 and is slidably in close contact with the outer peripheral surface 121 of the rotating shaft 120. In a state where the peripheral surface 21 is overlapped with the outer peripheral surface 12 of the seal ring 1 in the radial direction, the peripheral surface 21 is closely fitted with an appropriate surface pressure.

弾性リング2の外周面には、軸方向両端近傍に位置して円周方向へ連続した一対のシール突条22が形成されている。シール突条22の外径は、自由状態(未装着状態)では、ハウジング110の環状溝112の底面112aより適宜大径である。   On the outer peripheral surface of the elastic ring 2, a pair of seal protrusions 22 are formed in the vicinity of both ends in the axial direction and continuous in the circumferential direction. The outer diameter of the seal protrusion 22 is appropriately larger than the bottom surface 112a of the annular groove 112 of the housing 110 in a free state (unmounted state).

また、シール突条22,22の間には、軸方向、すなわち円周方向に対して直交する方向へ延びる多数の突起23が、円周方向等ピッチで形成されている。なお、弾性リング2の外周面は、請求項1に記載された「シールリングと反対側の面」に相当するものである。図2に示されるように、突起23はそれぞれ山形を呈するものであって、シール突条22と同じ高さに形成されている。   Further, a large number of protrusions 23 extending in the axial direction, that is, in a direction orthogonal to the circumferential direction, are formed between the seal protrusions 22 and 22 at a constant pitch in the circumferential direction. The outer peripheral surface of the elastic ring 2 corresponds to the “surface opposite to the seal ring” described in claim 1. As shown in FIG. 2, each of the protrusions 23 has a mountain shape and is formed at the same height as the seal protrusion 22.

この実施の形態による密封装置10は、以上のような構成を備えるため、図示の装着状態では、ゴム状弾性材料からなる弾性リング2がシールリング1と環状溝112の底面112aとの間で径方向に適宜圧縮され、その反力によって、外周のシール突条22,22及び多数の突起23を、適当につぶされた状態でハウジング110の環状溝112の底面112aに密接させる一方、合成樹脂からなるシールリング1に緊迫力を与えて、このシールリング1の内周面11を回転軸120の外周面121に摺動可能に密接させるものである。したがって、ハウジング110と回転軸120の間の軸周隙間Gが密封され、軸受側の流体の漏れや外部から軸受へのダストの侵入が防止される。   Since the sealing device 10 according to this embodiment has the above-described configuration, in the illustrated mounting state, the elastic ring 2 made of a rubber-like elastic material has a diameter between the seal ring 1 and the bottom surface 112a of the annular groove 112. The outer peripheral seal protrusions 22 and 22 and the multiple protrusions 23 are brought into close contact with the bottom surface 112a of the annular groove 112 of the housing 110 while being appropriately crushed by the reaction force. A sealing force is applied to the seal ring 1, and the inner peripheral surface 11 of the seal ring 1 is slidably brought into close contact with the outer peripheral surface 121 of the rotating shaft 120. Accordingly, the shaft circumferential gap G between the housing 110 and the rotating shaft 120 is sealed, and leakage of fluid on the bearing side and intrusion of dust from the outside to the bearing are prevented.

また、シールリング1は低摩擦合成樹脂材からなるものではあるが、回転軸120の回転条件等によっては、シールリング1に摺動抵抗により与えられる回転力が増大することがある。しかしながら、この密封装置10によれば、弾性リング2の外周面に円周方向等ピッチで形成された多数の山形突起23が、環状溝112の底面112aに適当なつぶし代をもって圧接しているので、前記底面112aに対する摩擦トルクが十分に大きなものとなっており、このため、シールリング1から伝達される回転力によって、ハウジング110に対して弾性リング2が相対回転してしまうのを有効に防止することができる。したがって、弾性リング2の外周面が環状溝112の底面112aと摺動して摩耗することもなく、シールリング1への径方向の押付力が低下して、早期に密封性の低下を来すのを防止することができる。   Although the seal ring 1 is made of a low friction synthetic resin material, the rotational force applied to the seal ring 1 due to sliding resistance may increase depending on the rotation conditions of the rotary shaft 120 and the like. However, according to this sealing device 10, a large number of chevron projections 23 formed on the outer peripheral surface of the elastic ring 2 at equal pitches in the circumferential direction are in pressure contact with the bottom surface 112 a of the annular groove 112 with an appropriate crushing margin. The friction torque with respect to the bottom surface 112a is sufficiently large. Therefore, it is possible to effectively prevent the elastic ring 2 from rotating relative to the housing 110 due to the rotational force transmitted from the seal ring 1. can do. Accordingly, the outer peripheral surface of the elastic ring 2 does not slide and wear with the bottom surface 112a of the annular groove 112, and the radial pressing force on the seal ring 1 is reduced, resulting in early deterioration of the sealing performance. Can be prevented.

なお、上記実施の形態とは、内外周逆の関係、すなわち回転軸(内周部材)の外周面に形成された環状溝に、内周側に弾性リング、外周側にシールリングが配置された位置関係として、シールリングの外周面を、ハウジングの内周面に摺動可能に密接させる密封装置にも、本発明を適用することができる。この場合は、シール突条及び突起は、弾性リングの内周面に形成される。   It should be noted that the above-described embodiment is opposite to the inner and outer circumferences, that is, an elastic ring on the inner circumferential side and a seal ring on the outer circumferential side are arranged in an annular groove formed on the outer circumferential surface of the rotating shaft (inner circumferential member). As a positional relationship, the present invention can also be applied to a sealing device that slidably contacts the outer peripheral surface of the seal ring with the inner peripheral surface of the housing. In this case, the seal protrusion and the protrusion are formed on the inner peripheral surface of the elastic ring.

本発明に係る密封装置の好ましい実施の形態を、その軸心を通る平面で切断して示す装着状態の断面図である。It is sectional drawing of the mounting state which cut | disconnects and shows preferable embodiment of the sealing device which concerns on this invention by the plane which passes the axial center. 図1におけるII‐II'線位置で軸心と直交する平面で切断して示す半断面図である。FIG. 2 is a half cross-sectional view cut along a plane orthogonal to the axis at the position II-II ′ in FIG. 1. 従来の密封装置を、その軸心を通る平面で切断して示す装着状態の断面図である。It is sectional drawing of the mounting state which shows the conventional sealing device cut | disconnected and shown by the plane which passes along the axial center.

符号の説明Explanation of symbols

1 シールリング
11,21 内周面
12,121 外周面
2 弾性リング
22 シール突条
23 突起
10 密封装置
110 ハウジング(外周部材)
111 軸孔
112 環状溝
112a 底面
120 回転軸(内周部材)
DESCRIPTION OF SYMBOLS 1 Seal ring 11, 21 Inner peripheral surface 12, 121 Outer peripheral surface 2 Elastic ring 22 Seal protrusion 23 Protrusion 10 Sealing device 110 Housing (outer peripheral member)
111 Shaft hole 112 Annular groove 112a Bottom surface 120 Rotating shaft (inner peripheral member)

Claims (1)

互いに同心的かつ相対回転可能に配置された外周部材(110)と内周部材(120)の互いの対向周面のうちの一方に形成された環状溝(112)に収納される密封装置であって、前記対向周面のうちの他方に摺動可能に密接される低摩擦樹脂からなるシールリング(1)と、このシールリング(1)に径方向に重合した状態に嵌着されたゴム状弾性材料からなる弾性リング(2)とを備え、この弾性リング(2)における前記シールリング(1)と反対側の面に、円周方向へ延びるシール突条(22)と、円周方向所定間隔で形成された多数の突起(23)を有し、これらシール突条(22)及び突起(23)が適当なつぶし代をもって前記環状溝(112)の底面(112a)に圧接されることを特徴とする密封装置。   The sealing device is housed in an annular groove (112) formed on one of the opposing peripheral surfaces of the outer peripheral member (110) and the inner peripheral member (120) arranged concentrically and relatively rotatably. A seal ring (1) made of a low friction resin that is slidably brought into close contact with the other of the opposed peripheral surfaces, and a rubber-like shape fitted to the seal ring (1) in a state of being polymerized in the radial direction An elastic ring (2) made of an elastic material, a seal protrusion (22) extending in a circumferential direction on a surface of the elastic ring (2) opposite to the seal ring (1), and a predetermined circumferential direction It has a number of protrusions (23) formed at intervals, and these seal protrusions (22) and protrusions (23) are pressed against the bottom surface (112a) of the annular groove (112) with an appropriate crushing allowance. Sealing device characterized.
JP2004258218A 2004-09-06 2004-09-06 Sealing device Pending JP2006071058A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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US20190178292A1 (en) * 2016-07-15 2019-06-13 Ihi Corporation Seal structure and turbocharger
WO2024009459A1 (en) * 2022-07-07 2024-01-11 株式会社ジェイテクト Rolling bearing device

Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS58163759A (en) * 1982-03-15 1983-09-28 津田駒工業株式会社 Weft yarn storing apparatus for fluid jet type loom
JPH0377859A (en) * 1989-08-21 1991-04-03 Nissei Kagaku Kogyo Kk Production of 2-acylamido-2-methylpropanesulfonic acid
JP2002310305A (en) * 2001-04-10 2002-10-23 Keeper Co Ltd Sealing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58163759A (en) * 1982-03-15 1983-09-28 津田駒工業株式会社 Weft yarn storing apparatus for fluid jet type loom
JPH0377859A (en) * 1989-08-21 1991-04-03 Nissei Kagaku Kogyo Kk Production of 2-acylamido-2-methylpropanesulfonic acid
JP2002310305A (en) * 2001-04-10 2002-10-23 Keeper Co Ltd Sealing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190178292A1 (en) * 2016-07-15 2019-06-13 Ihi Corporation Seal structure and turbocharger
US10648511B2 (en) * 2016-07-15 2020-05-12 Ihi Corporation Seal structure and turbocharger
WO2024009459A1 (en) * 2022-07-07 2024-01-11 株式会社ジェイテクト Rolling bearing device

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