JP2002276814A - Sealing device - Google Patents

Sealing device

Info

Publication number
JP2002276814A
JP2002276814A JP2001075582A JP2001075582A JP2002276814A JP 2002276814 A JP2002276814 A JP 2002276814A JP 2001075582 A JP2001075582 A JP 2001075582A JP 2001075582 A JP2001075582 A JP 2001075582A JP 2002276814 A JP2002276814 A JP 2002276814A
Authority
JP
Japan
Prior art keywords
backup ring
seal
projection
mounting groove
gap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001075582A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Abe
良行 阿部
Original Assignee
Nok Corp
エヌオーケー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nok Corp, エヌオーケー株式会社 filed Critical Nok Corp
Priority to JP2001075582A priority Critical patent/JP2002276814A/en
Publication of JP2002276814A publication Critical patent/JP2002276814A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To enhance a durability by effectively preventing a projection of a seal body at high pressure without increasing a cost and an installment space. SOLUTION: A projection 22 contacted with a corner part 32b of a mounting groove 32 of one member 3 is formed on an end surface 2a of a backup ring 2. The backup ring 2 is inclined with a good responsiveness making the projection 22 as a fulcrum by an axial load F from the seal body receiving a pressure and a gap δ1 between the backup ring 2 and the other member 4 is shrunk. Therefore, the projection of the seal body to this gap δ1 and a 'bitten' caused by this are effectively prevented. In the case where a pressure rise is relatively large, the gap δ1 is buried by falling down of the projection 22 and displacing the backup ring 2 to the other member 4 side.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、互いに同心的に配置されて相対移動する二部材間を密封する密封装置に関し、特に、一方の部材の取付溝内に装着されて、大気側空間側を向いたシール本体の背面がバックアップリングを介して支承されるものに関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device which seals a space between two members which are concentrically arranged and move relatively to each other, and more particularly to a sealing device which is mounted in a mounting groove of one of the members so that the air space side is closed. The back surface of the facing seal body is supported via a backup ring.

【0002】 [0002]

【従来の技術】従来、例えば油圧シリンダやショックア
ブソーバ等のピストンあるいはロッドとハウジングの間
に設けられる密封装置として、図8に示されるようなも
のが知られている。図8は、従来の技術による密封装置
をロッドシールとして用いた状態を、軸心を通る平面で
切断して示す半断面図である。
2. Description of the Related Art Conventionally, as a sealing device provided between a housing and a piston or rod, such as a hydraulic cylinder or a shock absorber, as shown in FIG. 8, is known. FIG. 8 is a half sectional view showing a state in which a sealing device according to a conventional technique is used as a rod seal, cut along a plane passing through an axis.

【0003】すなわちこの種の密封装置は、ゴム等の弾
性材料で成形され内周部及び外周部にシールリップ10
1,102を有するシール本体100と、このシール本
体100の背面側(シールリップ101,102と反対
側)に配置されるバックアップリング110とからな
り、例えばハウジング120の端部内周に形成された取
付溝121に収容状態に装着される。シール本体100
は、シールリップ101,102が、圧力導入によって
高圧となる圧力導入空間S側を向くように装着され、
外周シールリップ101が取付溝121の底面121a
に密接すると共に、内周シールリップ102が、例えばハウジング120の内周に軸方向往復動自在に挿通されたロッド130の外周面に摺動可能に密接し、圧力導入空間S と大気側空間S の間の密封を行う。 The inner circumference seal lip 102 is slidably close to the outer peripheral surface of the rod 130 inserted into the inner circumference of the housing 120 so as to be reciprocally movable in the axial direction, so that the pressure introduction space SH and the atmosphere side space are in close contact with each other. carry out the sealing between the S L. That is, this type of sealing device is made of an elastic material such as rubber, and has a seal lip 10 at an inner peripheral portion and an outer peripheral portion. That is, this type of sealing device is made of an elastic material such as rubber, and has a seal lip 10 at an inner peripheral portion and an outer peripheral portion.
1 and 102, and a backup ring 110 arranged on the back side of the seal body 100 (the side opposite to the seal lips 101 and 102). It is mounted in the groove 121 in a housed state. Seal body 100 1 and 102, and a backup ring 110 arranged on the back side of the seal body 100 (the side opposite to the seal lips 101 and 102). It is mounted in the groove 121 in a housed state. Seal body 100
Is mounted so that the seal lips 101 and 102 face the pressure introduction space SH side where the pressure is increased by pressure introduction. Is mounted so that the seal lips 101 and 102 face the pressure introduction space SH side where the pressure is increased by pressure introduction.
The outer peripheral seal lip 101 is the bottom surface 121a of the mounting groove 121. The outer peripheral seal lip 101 is the bottom surface 121a of the mounting groove 121.
Together closely, the inner periphery seal lip 102 is slidably and closely, for example, in the outer peripheral surface of the axially reciprocably inserted rods 130 inner periphery of the housing 120, a pressure introducing space S H and the atmosphere side space carry out the sealing between the S L. Together closely, the inner peripheral seal lip 102 is slidably and closely, for example, in the outer peripheral surface of the axially reciprocably inserted rods 130 inner peripheral of the housing 120, a pressure introducing space S H and the atmosphere side space carry out the sealing between the S L.

【0004】バックアップリング110の材質として
は、比較的軟質である例えばPTFE(ポリテトラフル
オロエチレン)を基材とするものと、比較的硬質である
ポリアミド樹脂(商品名ナイロン)等の熱可塑性樹脂か
らなるものに大別される。また、取付溝121への組付
けの都合上、クロスセクションCSに対して、ある程度
の隙間を許容する公差を設定する必要があるため、初期
状態では、ロッド130の外周面との間には径方向隙間
δが存在する。
[0004] The material of the backup ring 110 is made of a relatively soft material such as PTFE (polytetrafluoroethylene) as a base material and a relatively hard thermoplastic resin such as polyamide resin (trade name: nylon). It is roughly divided into In addition, since it is necessary to set a tolerance that allows a certain gap to the cross section CS for the purpose of assembling to the mounting groove 121, in the initial state, the diameter between the cross section CS and the outer peripheral surface of the rod 130 is smaller. there are direction gap [delta] 1.

【0005】図9は、使用時に圧力導入空間Sからの
高圧が作用した状態を、軸心を通る平面で切断して示す
半断面図である。すなわち、油圧等の導入によって圧力
導入空間Sが高圧になると、この圧力によってシール
本体100が、バックアップリング110を取付溝12
1の大気側空間S側の壁面121bに押し付けるの
で、バックアップリング110が軸方向に圧縮変形され
ると共に径方向に伸長変形し、隙間δを縮小させて、
シール本体100の背面における内周側の角部103
が、ハウジング120とロッド130との間の隙間δ
に食い込んで「食われ」と呼ばれる破損を生じるのを防止する。 Prevents damage called "eating" from biting into. [0005] Figure 9 is a state in which high pressure is applied from the pressure introduction space S H in use, it is a half cross-sectional view taken in a plane passing through an axis. That is, when the pressure introduction space SH becomes high due to the introduction of hydraulic pressure or the like, the pressure causes the seal body 100 to attach the backup ring 110 to the mounting groove 12. [0005] Figure 9 is a state in which high pressure is applied from the pressure introduction space S H in use, it is a half cross-sectional view taken in a plane passing through an axis. That is, when the pressure introduction space SH becomes high due to the introduction of exert pressure or the like, the pressure causes the seal body 100 to attach the backup ring 110 to the mounting groove 12.
Because pressing the 1 atmosphere side space S L side wall 121b, extend radially deformed with backup ring 110 is compressed and deformed in the axial direction, thereby reducing the gap [delta] 1, Because pressing the 1 atmosphere side space S L side wall 121b, extend cleaning deformed with backup ring 110 is compressed and deformed in the axial direction, thereby reducing the gap [delta] 1,
Inner peripheral corner 103 on the back surface of seal body 100 Inner peripheral corner 103 on the back surface of seal body 100
Is the gap δ 2 between the housing 120 and the rod 130. Is the gap δ 2 between the housing 120 and the rod 130.
To prevent breakage, which is called "eating". To prevent breakage, which is called "eating".

【0006】 [0006]

【発明が解決しようとする課題】上記従来の技術によれば、バックアップリング110がPTFEベースの材質からなるものは、比較的軟質であることから、圧力導入空間S の圧力上昇が比較的小さくても、径方向に容易に伸長変形して隙間δ をある程度埋めることができるが、その反面、耐圧性に劣る問題がある。このため、圧力導入空間S の圧力上昇が大きくなると、バックアップリング110自体が、ハウジング120とロッド13
0との間の隙間δ にはみ出して破損する恐れがあり、

高圧条件には不向きであった。 It was not suitable for high pressure conditions. また、PTFEは、材料価格及び加工コストが高価なものであった。 In addition, PTFE is expensive in terms of material price and processing cost. According to the invention It is an object of the above prior art, which the backup ring 110 is made of PTFE-based material is relatively because it is soft, the pressure rise in the pressure introduction space S H is relatively small also, although the gap [delta] 1 and easily extended radially deformed can fill some extent, on the other hand, there is a problem of poor pressure resistance. Therefore, when the pressure increase in the pressure introduction space SH is large, the backup ring 110 itself, the housing 120 and the rod 13 According to the invention It is an object of the above prior art, which the backup ring 110 is made of PTFE-based material is relatively because it is soft, the pressure rise in the pressure introduction space S H is relatively small also, although the gap [delta] 1 and easily extended deformed can fill some extent, on the other hand, there is a problem of poor pressure resistance. Therefore, when the pressure increase in the pressure introduction space SH is large, the backup ring 110 itself, the housing 120 and the rod 13
There is a risk of breakage by protruding into the gap δ 2 between There is a risk of breakage by thereby incorporating the gap δ 2 between
Not suitable for high pressure conditions. Further, PTFE has a high material price and a high processing cost. Not suitable for high pressure conditions. Further, PTFE has a high material price and a high processing cost.

【0007】一方、バックアップリング110がポリア
ミド樹脂等の熱可塑性樹脂からなるものは、比較的硬質
であることから、耐圧性に優れており、したがって、ハ
ウジング120とロッド130との間の隙間δを大き
くすることができるが、その反面、圧力導入空間S
高圧になった時の変形性に乏しいため、シール本体10
0に押圧されてバックアップリング110が伸長することによる隙間δ の縮小が僅かであり、特に、シール本体100が例えば耐油性に優れたNBR(ニトリルゴム)等からなるものである場合、NBRは変形性に富むため、シール本体100の角部103が隙間δ にはみ出してしまい、「食われ」を生じることがある。 The shrinkage of the gap δ 1 due to the expansion of the backup ring 110 by being pressed by 0 is slight, and in particular, when the seal body 100 is made of, for example, NBR (nitrile rubber) having excellent oil resistance, the NBR is Since it is highly deformable, the corner portion 103 of the seal body 100 may protrude into the gap δ 1 and cause “eating”. その対策としては、バックアップリング110を、圧力導入空間S の圧力が作用しない初期状態から隙間δ を可能な限り小さくしておくことも考えられるが、この場合は取付溝121とバックアップリング110の径方向の寸法公差を厳しくする必要があり、加工コストや生産性の点から限界があった。 As a countermeasure, the backup ring 110, it is conceivable to keep as small as possible the clearance [delta] 1 from an initial state in which the pressure in the pressure introduction space S H does not act, in this case mounting groove 121 and the backup ring 110 It was necessary to tighten the dimensional tolerance in the radial direction, and there was a limit in terms of processing cost and productivity. On the other hand, when the backup ring 110 is made of a thermoplastic resin such as a polyamide resin, it is relatively hard and therefore has excellent pressure resistance, and therefore, the gap δ 2 between the housing 120 and the rod 130. However, on the other hand, since the deformability when the pressure introduction space SH becomes high pressure is poor, the seal body 10 On the other hand, when the backup ring 110 is made of a thermoplastic resin such as a polyamide resin, it is relatively hard and therefore has excellent pressure resistance, and therefore, the gap δ 2 between the housing 120 and the rod 130. However , on the other hand, since the deformability when the pressure introduction space SH becomes high pressure is poor, the seal body 10
0 is pressed in a slightly reduced clearance [delta] 1 due to the back-up ring 110 is extended, in particular, when seal body 100 is, for example, made of excellent NBR (nitrile rubber) or the like in oil resistance, NBR is for rich in deformability, the corners 103 of the seal body 100 will protrude into the gap [delta] 1, which may cause "erosion". As a countermeasure, the backup ring 110, it is conceivable to keep as small as possible the clearance [delta] 1 from an initial state in which the pressure in the pressure introduction space S H does not act, in this case mounting groove 121 and the backup ring 110 It is necessary to tighten the dimensional tolerance in the radial direction, and there is a limit in terms of processing cost and productivity. 0 is pressed in a slightly reduced clearance [delta] 1 due to the back-up ring 110 is extended, in particular, when seal body 100 is, for example, made of excellent NBR (nitrile rubber) or the like in oil resistance, NBR is for rich in deformability, the corners 103 of the seal body 100 will protrude into the gap [delta] 1, which may cause "erosion". As a instructions, the backup ring 110, it is conceivable to keep as small as possible the clearance [delta] 1 from an initial state in which the pressure in the pressure introduction space S H does not act, in this case mounting groove 121 and the backup ring 110 It is necessary to tighten the dimensional tolerance in the radial direction, and there is a limit in terms of processing cost and productivity.

【0008】また、シール本体100の角部103がバ
ックアップリング110の内周隙間δにはみ出すとい
った不具合を防止するには、図10に従来の技術による
密封装置の他の例が示されるように、比較的軟質である
PTFEベースのバックアップリング110Aと、比較
的硬質であるポリアミド樹脂等の熱可塑性樹脂からなる
バックアップリング110Bを併用することが考えられ
るが、この場合は部品数の増加によるコストの上昇や、
装着スペースの増大を来す問題がある。 There is a problem that the mounting space is increased. Further, as the corners 103 of the seal body 100 is to prevent a problem protrude on the inner peripheral clearance [delta] 1 of the backup ring 110 is another example of a sealing device according to the prior art in FIG. 10 is shown It is conceivable to use a relatively soft PTFE-based backup ring 110A and a relatively hard backup ring 110B made of a thermoplastic resin such as a polyamide resin in this case. Rising, Further, as the corners 103 of the seal body 100 is to prevent a problem thermoplastic on the inner peripheral clearance [delta] 1 of the backup ring 110 is another example of a sealing device according to the prior art in FIG. 10 is shown It is conceivable to use a relatively soft PTFE-based backup ring 110A and a relatively hard backup ring 110B made of a thermoplastic resin such as a polyamide resin in this case. Rising,
There is a problem that the mounting space increases. There is a problem that the mounting space increases.

【0009】本発明は、上記のような問題に鑑みてなされたもので、その技術的課題とするところは、コスト及び装着スペースの増大を来すことなく、高圧時のシール本体のはみ出しを有効に防止してその耐久性を高めることにある。 SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its technical object to effectively protrude a seal body under high pressure without increasing cost and mounting space. And to increase its durability.

【0010】 [0010]

【課題を解決するための手段】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、互いに同心的に配置された二部材のうち一
方の部材に形成された環状の取付溝内に装着され他方の
部材と摺接されるシール本体と、前記取付溝内に前記シ
ール本体の低圧側に配置されるバックアップリングとを
備え、前記バックアップリングの端面に、前記隅部又は
この隅部近傍の端面と接触する突起が形成されたもので
ある。
As a means for effectively solving the above-mentioned technical problem, a sealing device according to the first aspect of the present invention is provided with a sealing member provided in one of two members concentrically arranged. A seal body mounted in the formed annular mounting groove and slidably in contact with the other member; and a backup ring disposed on the low pressure side of the seal body in the mounting groove. And a projection which is in contact with the corner or an end face near the corner.

【0011】また、請求項2の発明に係る密封装置は、
請求項1の発明において、突起が、所定値以上の軸方向荷重により取付溝の隅部側へ倒れてバックアップリングを他方の部材側へ変位させるものである。
Further, the sealing device according to the second aspect of the present invention,
According to the first aspect of the present invention, the protrusion falls down to the corner of the mounting groove by an axial load equal to or more than a predetermined value to displace the backup ring toward the other member.

【0012】また、請求項3の発明に係る密封装置は、
請求項1又は2の発明において、バックアップリングの軸方向肉厚をH、径方向幅をT、バックアップリングと他方の部材との間の隙間をδ とすると、突起の高さh In the invention of claim 1 or 2, assuming that the axial wall thickness of the backup ring is H, the radial width is T, and the gap between the backup ring and the other member is δ 1 , the height of the protrusion is h.
が、 h=δ ・T/H である。 However, h = δ 1 · T / H. Further, the sealing device according to the third aspect of the present invention, Further, the sealing device according to the third aspect of the present invention,
In the invention of claim 1 or 2, the axial thickness of the backup ring H, the radial width T, When the gap [delta] 1 between the backup ring and the other member, the projection height h In the invention of claim 1 or 2, the axial thickness of the backup ring H, the radial width T, When the gap [delta] 1 between the backup ring and the other member, the projection height h
H = δ 1 · T / H H = δ 1 · T / H

【0013】また、請求項4の発明に係る密封装置は、
互いに同心的に配置された二部材のうち一方の部材に形成された環状の取付溝内に装着され他方の部材と摺接されるシール本体と、前記取付溝内に前記シール本体の低圧側に配置されるバックアップリングとを備え、前記バックアップリングに、前記底面と弾性的に接触して前記バックアップリングを前記他方の部材側へ付勢させる突起が形成されたものである。 A seal body mounted in an annular mounting groove formed in one of the two members arranged concentrically with each other and slidably contacting the other member, and in the mounting groove on the low pressure side of the seal body. It is provided with a backup ring to be arranged, and the backup ring is formed with a protrusion that elastically contacts the bottom surface and urges the backup ring toward the other member. [0013] The sealing device according to the invention of claim 4 is: [0013] The sealing device according to the invention of claim 4 is:
A seal body mounted in an annular mounting groove formed in one of the two members concentrically arranged and slidably contacted with the other member; and a low pressure side of the seal body in the mounting groove. A backup ring to be disposed, wherein a projection is formed on the backup ring to elastically contact the bottom surface and urge the backup ring toward the other member. A seal body mounted in an annular mounting groove formed in one of the two members concentrically arranged and slidably contacted with the other member; and a low pressure side of the seal body in the mounting groove. A backup ring to be disposed, wherein a projection is formed on the backup ring to elastically contact the bottom surface and urge the backup ring toward the other member.

【0014】[0014]

【発明の実施の形態】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説明する。図
1は、本発明による密封装置をロッドシールとして用い
た第一の実施の形態を、軸心を通る平面で切断して示す
半断面図、図2はこの密封装置を構成するバックアップ
リングを、軸心を通る平面で切断して示す断面図であ
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sealing device according to the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view showing a first embodiment in which a sealing device according to the present invention is used as a rod seal, cut along a plane passing through an axis, and FIG. 2 shows a backup ring constituting the sealing device. It is sectional drawing cut | disconnected and shown by the plane which passes an axis.

【0015】まず図1において、参照符号3は一方の部
材としてのハウジングで、例えば油圧シリンダ装置等に
おけるロッドカバー等に相当する。また、参照符号4は
他方の部材としてのロッドで、ハウジング3の内周に同
心的にかつ軸方向往復動自在に挿通されている。ハウジ
ング3の内周面31には、円周方向へ連続した環状の取
付溝32が形成されており、この実施の形態による密封
装置は、取付溝32内に配置されたシール本体1とバッ
クアップリング2とからなる。
First, in FIG. 1, reference numeral 3 denotes a housing as one member, which corresponds to, for example, a rod cover in a hydraulic cylinder device or the like. Reference numeral 4 denotes a rod as the other member, which is inserted through the inner periphery of the housing 3 concentrically and reciprocally in the axial direction. The inner peripheral surface 31 of the housing 3 is formed with an annular mounting groove 32 that is continuous in the circumferential direction. The sealing device according to this embodiment includes the seal body 1 and the backup ring disposed in the mounting groove 32. 2

【0016】シール本体1は、ゴム等の弾性材料で成形
されたものであって、すなわち、その内周部及び外周部
には、高圧となるシリンダ内部の圧力導入空間S側を
向いて円周方向に連続した一対のシールリップ11,1
2が形成されており、外周シールリップ11の先端近傍の外周面が、取付溝32の底面32aに密接すると共に、内周シールリップ12の先端近傍の内周面が、ロッド4の外周面に摺動可能に密接することによって、圧力導入空間S と、大気側空間S とを分離するものである。 2 is formed, the outer peripheral surface near the tip of the outer peripheral seal lip 11 is in close contact with the bottom surface 32a of the mounting groove 32, and the inner peripheral surface near the tip of the inner peripheral seal lip 12 is on the outer peripheral surface of the rod 4. by closely slidably and separates the pressure introducing space S H, and the atmosphere side space S L. The seal body 1, which has been molded with an elastic material such as rubber, that is, the inner peripheral portion thereof and the outer peripheral portion, the circle facing the pressure introducing space S H of the cylinder interior becomes a high-pressure A pair of circumferentially continuous seal lips 11, 1 The seal body 1, which has been molded with an elastic material such as rubber, that is, the inner peripheral portion thereof and the outer peripheral portion, the circle facing the pressure introducing space S H of the cylinder interior becomes a high-pressure A pair of cylinderly continuous seal lips 11, 1
2, the outer peripheral surface near the distal end of the outer peripheral seal lip 11 is in close contact with the bottom surface 32a of the mounting groove 32, and the inner peripheral surface near the distal end of the inner peripheral seal lip 12 is on the outer peripheral surface of the rod 4. by closely slidably and separates the pressure introducing space S H, and the atmosphere side space S L. 2, the outer peripheral surface near the distal end of the outer peripheral seal lip 11 is in close contact with the bottom surface 32a of the mounting groove 32, and the inner peripheral surface near the distal end of the inner peripheral seal lip 12 is on the outer peripheral surface of the rod 4. by closely slidably and separates the pressure introducing space SH , and the atmosphere side space S L.

【0017】バックアップリング2は、例えばポリアミド樹脂等、比較的硬質の熱可塑性樹脂を用いて扁平な環状に成形されたものであって、その外径は、取付溝32
の底面32aと同径又はそれより僅かに小径に形成され、内径はロッド4の外径よりも僅かに大径に形成されている。 The diameter is the same as or slightly smaller than the diameter of the bottom surface 32a of the rod 4, and the inner diameter is formed to be slightly larger than the outer diameter of the rod 4. したがって、バックアップリング2の径方向幅Tは、取付溝32の底面32aとロッド2の外周面との間のクロスセクションCSよりも僅かに小さなものとなっており、初期状態において、バックアップリング2の内周面とロッド2との間には、隙間δ が存在する。 Therefore, the radial width T of the backup ring 2 is slightly smaller than the cross section CS between the bottom surface 32a of the mounting groove 32 and the outer peripheral surface of the rod 2, and in the initial state, the backup ring 2 There is a gap δ 1 between the inner peripheral surface and the rod 2. また、このバックアップリング2は、図2に示されるように、円周方向一箇所に切断部21を有することによって縮径変位することができ、これによって、小径であるハウジング3の内周面31から、取付溝32内へ挿入することができるようになっている。 Further, as shown in FIG. 2, the backup ring 2 can be displaced in diameter by having a cutting portion 21 at one position in the circumferential direction, whereby the inner peripheral surface 31 of the housing 3 having a small diameter can be displaced. Therefore, it can be inserted into the mounting groove 32. The backup ring 2 is formed in a flat annular shape using a relatively hard thermoplastic resin such as a polyamide resin, for example. The backup ring 2 is formed in a flat annular shape using a relatively hard thermoplastic resin such as a polyamide resin, for example.
Is formed to have the same diameter as or slightly smaller than the bottom surface 32a of the rod 4, and the inner diameter is formed slightly larger than the outer diameter of the rod 4. Therefore, the radial width T of the backup ring 2 is slightly smaller than the cross section CS between the bottom surface 32a of the mounting groove 32 and the outer peripheral surface of the rod 2, and in the initial state, the backup ring 2 between the inner circumferential surface and the rod 2, a gap [delta] 1 is present. Further, as shown in FIG. 2, the backup ring 2 can be reduced in diameter by having a cut portion 21 at one location in the circumferential direction, and thereby, the inner peripheral surface 31 of the small-diameter housing 3 can be displaced. From above, it can be inserted into the mounting groove 32. Is formed to have the same diameter as or slightly smaller than the bottom surface 32a of the rod 4, and the inner diameter is formed slightly larger than the outer diameter of the rod 4. Therefore, the radial width T of the backup ring 2 is slightly smaller than the cross section CS between the bottom surface 32a of the mounting groove 32 and the outer peripheral surface of the rod 2, and in the initial state, the backup ring 2 between the inner sintered surface and the rod 2, a gap [ delta] 1 is present. Further, as shown in FIG. 2, the backup ring 2 can be reduced in diameter by having a cut portion 21 at one location in the producing direction, and thereby, the inner peripheral surface 31 of the small- diameter housing 3 can be displaced. From above, it can be inserted into the mounting groove 32.

【0018】バックアップリング2の両端面2a,2b
における外周端部には、それぞれ円周方向へ環状に連続した突起22が形成されており、このうち一方の突起2 On the outer peripheral end portion of the above, protrusions 22 which are continuous in an annular shape in the circumferential direction are formed, and one of the protrusions 2
2がハウジング3の取付溝32における低圧側の隅部3 2 is the corner 3 on the low pressure side in the mounting groove 32 of the housing 3.
2bと接触している。 It is in contact with 2b. なお、突起22が一方の端面にのみ形成されている場合は、これを隅部32bと接触させるためには、取付溝32への挿入の際に突起22の向きを考慮する必要があるが、図示の実施の形態においては両端面2a,2bに設けてあるので、装着の向きを考慮する必要がない。 When the protrusion 22 is formed on only one end face, it is necessary to consider the direction of the protrusion 22 when inserting it into the mounting groove 32 in order to bring it into contact with the corner portion 32b. In the illustrated embodiment, since it is provided on both end faces 2a and 2b, it is not necessary to consider the mounting direction. Both end faces 2a, 2b of the backup ring 2 Both end faces 2a, 2b of the backup ring 2
Are formed at the outer peripheral end portions thereof in the form of protrusions 22 which are annularly continuous in the circumferential direction. Are formed at the outer peripheral end portions thereof in the form of protrusions 22 which are annularly continuous in the communicating direction.
2 is a corner 3 on the low pressure side in the mounting groove 32 of the housing 3 2 is a corner 3 on the low pressure side in the mounting groove 32 of the housing 3
2b. When the protrusion 22 is formed only on one end surface, in order to make it contact the corner 32b, it is necessary to consider the direction of the protrusion 22 when inserting the protrusion 22 into the mounting groove 32. In the illustrated embodiment, since it is provided on both end surfaces 2a and 2b, it is not necessary to consider the mounting direction. 2b. When the protrusion 22 is formed only on one end surface, in order to make it contact the corner 32b, it is necessary to consider the direction of the protrusion 22 when inserting the protrusion 22 into the mounting groove 32. In the illustrated embodiment , since it is provided on both end surfaces 2a and 2b, it is not necessary to consider the mounting direction.

【0019】図3は、突起22及びその近傍部分を拡大して示す部分断面図である。この図3に示されるように、突起22は、外周面22aがバックアップリング2
の外周面2cと面一をなし、内周面22bが先端22c

へ向けて漸次大径になるテーパ状をなしている。 It has a tapered shape that gradually increases in diameter toward. このため、軸方向圧縮荷重を受けた場合は、図中一点鎖線で示されるように、外周側へ倒れ込むように変形するようになっている。 Therefore, when an axial compressive load is applied, it is deformed so as to collapse toward the outer peripheral side as shown by the alternate long and short dash line in the figure. FIG. 3 is an enlarged partial sectional view showing the projection 22 and its vicinity. As shown in FIG. 3, the protrusion 22 has an outer peripheral surface 22 a formed on the backup ring 2. FIG. 3 is an enlarged partial sectional view showing the projection 22 and its proximity. As shown in FIG. 3, the protrusion 22 has an outer peripheral surface 22 a formed on the backup ring 2.
Is flush with the outer peripheral surface 2c, and the inner peripheral surface 22b is the tip 22c. Is flush with the outer peripheral surface 2c, and the inner peripheral surface 22b is the tip 22c.
The tapered shape gradually increases in diameter toward. For this reason, when an axial compressive load is received, as shown by a dashed line in the figure, the diaper is deformed so as to fall to the outer peripheral side. The tapered shape gradually increases in diameter toward. For this reason, when an axial compressive load is received, as shown by a dashed line in the figure, the diaper is deformed so as to fall to the outer peripheral side.

【0020】突起22の軸方向突出高さhは、 h=δ・T/H …(1) となっている。なお、Hはバックアップリング2の軸方
向肉厚である。また好ましくは、突起22の内周面22
bがバックアップリング2の端面2aとほぼ面一となる
まで倒れ込んだ時の、突起22の径方向突出高さh’
が、初期隙間δと略同等となるようにする。
The height h of the protrusion 22 in the axial direction is as follows: h = δ 1 · T / H (1) H is the thickness of the backup ring 2 in the axial direction. Also preferably, the inner peripheral surface 22 of the projection 22
The radial projection height h ′ of the projection 22 when b falls down until it is substantially flush with the end face 2 a of the backup ring 2.
But so that the initial clearance [delta] 1 is substantially equal. But so that the initial clearance [delta] 1 is substantially equal.

【0021】図4は、本発明による作用を、シール本体1を省略して示す説明図である。すなわち、上述のように構成された密封装置は、圧力導入空間S に作動圧力が導入されていない初期状態では、同図(A)に示されるように、バックアップリング2は、外周面2cがハウジング3の取付溝32における底面32aと接触し、突起22が前記取付溝32における大気側空間S 側の隅部32bと接触し、大気側空間S 側を向いた端面2a
が、取付溝32の端面32cと非接触状態にあり、バックアップリング2の内周面2dとロッド4の外周面との間に、隙間δ が形成されている。 However, there is no contact with the end surface 32c of the mounting groove 32, and a gap δ 1 is formed between the inner peripheral surface 2d of the backup ring 2 and the outer peripheral surface of the rod 4. FIG. 4 is an explanatory view showing the operation of the present invention with the seal body 1 omitted. That is, the configured sealing device as described above, in the initial state in which the operating pressure in the pressure introducing space S H not introduced, as shown in Fig. (A), the backup ring 2, the outer peripheral surface 2c in contact with the bottom surface 32a of the mounting groove 32 of the housing 3, projection 22 is in contact with the atmosphere side space SL side corner portion 32b of the mounting groove 32, the end face 2a facing the air-side space SL side FIG. 4 is an explanatory view showing the operation of the present invention with the seal body 1 omitted. That is, the configured sealing device as described above, in the initial state in which the operating pressure in the pressure introducing space S H not introduced. , as shown in Fig. (A), the backup ring 2, the outer peripheral surface 2c in contact with the bottom surface 32a of the mounting groove 32 of the housing 3, projection 22 is in contact with the atmosphere side space SL side corner portion 32b of the mounting groove 32, the end face 2a facing the air-side space SL side
Are in a non-contact state with the end face 32 c of the mounting groove 32, and a gap δ 1 is formed between the inner peripheral face 2 d of the backup ring 2 and the outer peripheral face of the rod 4. Are in a non-contact state with the end face 32 c of the mounting groove 32, and a gap δ 1 is formed between the inner peripheral face 2 d of the backup ring 2 and the outer peripheral face of the rod 4.

【0022】次に、圧力導入空間S に油圧等による作動圧力が導入されることによって、この圧力導入空間S
が大気側空間S よりも高圧になると、その圧力を受けるシール本体によって、バックアップリング2は、取付溝32における大気側空間S 側の端面2aへ向けて押圧され、図4(B)に示されるように、突起22を支点として傾斜し、大気側空間S 側を向いた端面2aの内周部2a'が、取付溝32の端面32cの内周端部と接触する。 When H is high than the atmospheric side space S L, the seal body for receiving the pressure, the backup ring 2 is pressed toward the end face 2a of the atmosphere-side space S L side in the mounting groove 32, and FIG. 4 (B) As shown in the above, the inner peripheral portion 2a'of the end surface 2a that is inclined with the protrusion 22 as a fulcrum and faces the atmosphere side space SL side comes into contact with the inner peripheral end portion of the end surface 32c of the mounting groove 32. このため、バックアップリング2の内周面とロッド4の外周面との隙間δ が、圧力導入空間S 側(シール本体側)で縮小される。 Therefore, the gap δ 1 between the inner peripheral surface of the backup ring 2 and the outer peripheral surface of the rod 4 is reduced on the pressure introduction space SH side (seal body side). Next, by operating the pressure by the hydraulic or the like is introduced into the pressure introducing space S H, the pressure introducing space S Next, by operating the pressure by the hydraulic or the like is introduced into the pressure introducing space S H, the pressure introducing space S
When H is high than the atmospheric side space S L, the seal body for receiving the pressure, the backup ring 2 is pressed toward the end face 2a of the atmosphere-side space S L side in the mounting groove 32, and FIG. 4 (B) as shown in, inclined projection 22 as a fulcrum, the inner peripheral portion 2a of the end face 2a facing the air-side space S L 'side is in contact with the inner peripheral edge of the end face 32c of the mounting groove 32. Therefore, the gap [delta] 1 between the inner and outer circumferential surfaces of the rod 4 of the backup ring 2 is reduced in pressure introducing space S H side (seal body). When H is high than the atmospheric side space S L, the seal body for receiving the pressure, the backup ring 2 is pressed toward the end face 2a of the atmosphere-side space S L side in the mounting groove 32, and FIG. 4 (B) as shown in, inclined projection 22 as a fulcrum, the inner peripheral portion 2a of the end face 2a facing the air-side space S L' side is in contact with the inner peripheral edge of the end face 32c of the mounting groove 32. Therefore, the gap [delta] 1 between the inner and outer extending surfaces of the rod 4 of the backup ring 2 is reduced in pressure introducing space S H side (seal body).

【0023】ここで、図4(B)に示される状態でのバックアップリング2の傾斜角度をθとすると、突起22
の高さhは、 h≒Ttanθ …(2) で表されるから、 tanθ=h/T …(3) である。 Since the height h of is represented by h≈T tan θ ... (2), tan θ = h / T ... (3). 一方、隙間δ の大きさは、 δ =Htanθ …(4) で表されるから tanθ=δ /H …(5) である。 On the other hand, the size of the gap [delta] 1 is because represented by δ 1 = Htanθ ... (4) tanθ = δ 1 / H ... (5). すなわち上記(3)式及び(5)式から、 h/T=δ /H …(6) であるから、突起22の高さhを先の(1)式のように設定しておけば、バックアップリング2が図4(B)に示される状態に傾斜した時に、その内周面2dにおける圧力導入空間S 側(シール本体側)の端部2d'とロッド4の外周面との間では、隙間δ がほぼ0となる。 That is, from the above equations (3) and (5), h / T = δ 1 / H ... (6). Therefore, if the height h of the protrusion 22 is set as in the above equation (1). When the backup ring 2 is tilted to the state shown in FIG. 4B, between the end portion 2d'on the pressure introduction space SH side (seal body side) on the inner peripheral surface 2d and the outer peripheral surface of the rod 4. Then, the gap δ 1 becomes almost 0. Here, assuming that the inclination angle of the backup ring 2 in the state shown in FIG. Here, assuming that the approach angle of the backup ring 2 in the state shown in FIG.
Is represented by h ≒ T tan θ (2), so that tan θ = h / T (3). On the other hand, the size of the gap [delta] 1 is because represented by δ 1 = Htanθ ... (4) tanθ = δ 1 / H ... (5). That is, from the above equations (3) and (5), h / T = δ 1 / H (6), so that the height h of the protrusion 22 is set as in the above equation (1). When the backup ring 2 is tilted to the state shown in FIG. 4B, between the end 2 d ′ of the pressure introduction space SH side (the seal body side) in the inner peripheral surface 2 d and the outer peripheral surface of the rod 4. In this case, the gap δ 1 becomes substantially zero. Is represented by h ≒ T tan θ (2), so that tan θ = h / T (3). On the other hand, the size of the gap [delta] 1 is because represented by δ 1 = H tan θ ... ( 4) tan θ = δ 1 / H ... (5). That is, from the above equations (3) and (5), h / T = δ 1 / H (6), so that the height h of the protrusion 22 is set as in the above equation (1). When the backup ring 2 is tilted to the state shown in FIG. 4B, between the end 2 d ′ of the pressure introduction space SH side (the seal body side) in the inner peripheral surface 2 d and the outer peripheral surface of the rod 4. In this case, the gap δ 1 becomes substantially zero.

【0024】また、支点となる突起22がバックアップ
リング2の外周端部に位置しているので、上述のような
バックアップリング2の傾斜変位は、シール本体からの
軸方向押圧荷重Fが小さくても応答良く行われる。した
がって圧力導入空間Sの圧力上昇幅が小さくても、確
実に隙間δを埋めて、シール本体1の背面における内
周側の角部13のはみ出し及びこれに起因する「食わ
れ」と呼ばれる破損を生じるのを防止することができ
る。
Further, since the projection 22 serving as a fulcrum is located at the outer peripheral end of the backup ring 2, the inclination displacement of the backup ring 2 as described above can be performed even if the axial pressing load F from the seal body is small. Responsive. Thus even with a small pressure rise in the pressure introducing space S H, it is ensured by filling the gap [delta] 1, protruding on the inner circumferential side of the corner 13 at the rear surface of the seal body 1 and due to this called "Erosion" Damage can be prevented from occurring.

【0025】次に、圧力導入空間Sの圧力によって、
シール本体1からバックアップリング2への押圧荷重F
が更に上昇して行くと、これに伴って、突起22は、図
4(C)に示されるように外周側へ倒れ込む。これは、
先の図3に示されるように、突起22の外周面22aが
バックアップリング2の外周面と面一をなし、内周面2
2bが先端22cへ向けて漸次大径になるテーパ状をなすからである。 This is because 2b forms a taper shape that gradually increases in diameter toward the tip 22c. そして、バックアップリング2は、円周方向一箇所に切断部21を有することによって縮径変位可能であるため、外周側へ倒れ込む突起22に押されて内周側へ変位する。 Since the backup ring 2 can be displaced in diameter by having the cutting portion 21 at one position in the circumferential direction, it is pushed by the protrusion 22 that collapses to the outer peripheral side and is displaced to the inner peripheral side. したがって、突起22がバックアップリング2の端面2aとほぼ面一となるまで倒れ込んだ時の、突起22の径方向突出高さh'が、初期隙間δ Therefore, when the protrusion 22 collapses until it is substantially flush with the end surface 2a of the backup ring 2, the radial protrusion height h'of the protrusion 22 is the initial gap δ 1.
と略同等となるようにすることによって、バックアップリング2の内周面2dとロッド4の外周面との間で、隙間がほぼ0となる。 By making the backup ring 2 substantially equivalent to the above, the gap between the inner peripheral surface 2d of the backup ring 2 and the outer peripheral surface of the rod 4 becomes substantially zero. [0025] Then, by the pressure of the pressure introducing space SH, [0025] Then, by the pressure of the pressure introducing space SH,
Pressing load F from seal body 1 to backup ring 2 Pressing load F from seal body 1 to backup ring 2
Is further raised, the projection 22 falls along the outer periphery as shown in FIG. 4 (C). this is, Is further raised, the projection 22 falls along the outer peripheral as shown in FIG. 4 (C). This is,
As shown in FIG. 3, the outer peripheral surface 22 a of the projection 22 is flush with the outer peripheral surface of the backup ring 2, and the inner peripheral surface 2 a As shown in FIG. 3, the outer peripheral surface 22 a of the projection 22 is flush with the outer peripheral surface of the backup ring 2, and the inner peripheral surface 2 a
This is because 2b has a tapered shape whose diameter gradually increases toward the tip 22c. The backup ring 2 can be reduced in diameter by being provided with a cut portion 21 at one location in the circumferential direction, so that the backup ring 2 is displaced toward the inner periphery by being pushed by the protrusion 22 that falls down to the outer periphery. Therefore, when the projection 22 is tilted down until it is substantially flush with the end face 2a of the backup ring 2, the radial projection height h ′ of the projection 22 is equal to the initial gap δ 1. This is because 2b has a tapered shape whose diameter gradually increases toward the tip 22c. The backup ring 2 can be reduced in diameter by being provided with a cut portion 21 at one location in the preceding direction, so that the backup ring 2 is displaced toward the inner peripheral by being pushed by the protrusion 22 that falls down to the outer peripheral. Therefore, when the projection 22 is tilted down until it is substantially flush with the end face 2a of the backup ring 2, the radial projection height h ′ of the projection 22 is equal to the initial gap δ 1.
The gap between the inner peripheral surface 2d of the backup ring 2 and the outer peripheral surface of the rod 4 becomes substantially zero by making the distance substantially equal to the above. The gap between the inner peripheral surface 2d of the backup ring 2 and the outer peripheral surface of the rod 4 becomes substantially zero by making the distance substantially equal to the above.

【0026】したがって、この実施の形態によれば、バ
ックアップリング2がポリアミド樹脂等のような比較的
硬質の熱可塑性樹脂からなることによって、軸方向圧縮
荷重を受けても径方向へ伸長変形しにくいものであるに
も拘らず、高圧時にロッド4の外周面との隙間δを著
しく縮小させることができる。このため、シール本体1
が例えばNBR(ニトリルゴム)等からなるものであっ
ても、このシール本体1の背面における内周側の角部1
3が、高圧時に隙間δ にはみ出して「食われ」と呼ばれる破損を生じるのを防止することができる。 It is possible to prevent 3 from protruding into the gap δ 1 at high pressure and causing damage called “eating”. Therefore, according to this embodiment, since the backup ring 2 is made of a relatively hard thermoplastic resin such as a polyamide resin, it is difficult for the backup ring 2 to expand and deform in the radial direction even when subjected to an axial compressive load. despite those, it is possible to significantly reduce the gap [delta] 1 and the outer circumferential surface of the rod 4 to the high pressure during. For this reason, the seal body 1 Therefore, according to this embodiment, since the backup ring 2 is made of a relatively hard thermoplastic resin such as a polyamide resin, it is difficult for the backup ring 2 to expand and deform in the radial direction even when subjected to an axial compressive load. . Despite those, it is possible to significantly reduce the gap [delta] 1 and the outer thermoplastic surface of the rod 4 to the high pressure during. For this reason, the seal body 1
May be made of, for example, NBR (nitrile rubber) or the like. May be made of, for example, NBR (nitrile rubber) or the like.
3, protrude into the gap [delta] 1 to the high pressure at can be prevented from causing damage called "Erosion". 3, eroded into the gap [delta] 1 to the high pressure at can be prevented from causing damage called "Erosion".

【0027】また、バックアップリング2に硬質の熱可
塑性樹脂を用いることができる結果、耐圧性が向上する
ので、ハウジング3とロッド4との間の隙間δを大き
くすることができる。しかも、上記理由から、圧力導入
空間Sの圧力が作用しない初期状態では、バックアッ
プリング2とロッド4との間の隙間δをそれほど小さ
くする必要はなく、したがって取付溝32とバックアッ
プリング2の径方向の寸法公差を厳しくする必要がな
く、ポリアミド樹脂等の熱可塑性樹脂はPTFEに比較
して低廉であるため、バックアップリング2の加工コス
ト及び材料コストを安価に抑えることができる。
Further, the results can be a thermoplastic resin of rigid backup ring 2, since the pressure resistance is improved, it is possible to increase the gap [delta] 2 between the housing 3 and the rod 4. Moreover, for the reasons stated above, in an initial state in which the pressure in the pressure introduction space S H does not act, there is no need to so small a gap [delta] 1 between the backup ring 2 and the rod 4, thus the mounting groove 32 and the backup ring 2 There is no need to tighten the dimensional tolerance in the radial direction, and the thermoplastic resin such as polyamide resin is inexpensive as compared with PTFE, so that the processing cost and material cost of the backup ring 2 can be reduced.

【0028】なお、突起22は、軸方向圧縮荷重を受けることによって、外周側へ倒れ込むものであれば良いため、図3に示される断面形状に限定されるものではない。例えば、図5(A)〜(E)は突起22の他の断面形状例を示すものである。 The projection 22 is not limited to the cross-sectional shape shown in FIG. 3 as long as the projection 22 falls down to the outer peripheral side by receiving the compressive load in the axial direction. For example, FIGS. 5A to 5E show other examples of the cross-sectional shape of the protrusion 22.

【0029】このうち、図5(A)は、軸方向荷重を受けることによって外周側へ一層倒れ込みやすいように、
突起22の内周面22bをR状凸面としたものである。 The inner peripheral surface 22b of the protrusion 22 is an R-shaped convex surface. Among them, FIG. 5 (A) shows that, in order to easily fall down to the outer peripheral side by receiving an axial load, Among them, FIG. 5 (A) shows that, in order to easily fall down to the outer peripheral side by receiving an axial load,
The inner peripheral surface 22b of the projection 22 is formed as an R-shaped convex surface. The inner peripheral surface 22b of the projection 22 is formed as an R-shaped convex surface.

【0030】図5(B)は、突起22の内周面22bをR状凸面に形成すると共に、先端22cが軸方向荷重によって潰れにくいように、先端22cをR状凸面としたものである。 FIG. 5B shows an example in which the inner peripheral surface 22b of the projection 22 is formed as an R-shaped convex surface, and the end 22c is formed as an R-shaped convex surface so that the end 22c is not easily crushed by an axial load.

【0031】図5(C)は、突起22が軸方向荷重によ
って外周側へ倒れ込んだ時に、この突起22の内周面2
2bとバックアップリング2の端面2aとの間の凹面2
2dに、引張り応力によって亀裂を生じることがないよ
うに、この凹面22dをR状に形成して、引張り応力の
集中を防止したものである。これは、突起22の破損に
よる破片の発生及びコンタミを嫌う条件において、特に
有効である。
FIG. 5C shows the inner peripheral surface 2 of the projection 22 when the projection 22 falls down to the outer peripheral side due to the axial load.
2b between the end face 2a of the backup ring 2
This concave surface 22d is formed in an R-shape so as not to cause cracks due to tensile stress in 2d, thereby preventing the concentration of tensile stress. This is particularly effective under conditions where generation of debris due to breakage of the projection 22 and contamination are disliked. This is particularly effective under conditions where generation of debris due to breakage of the projection 22d is formed in an R-shape so as not to cause cracks due to tensile stress in 2d, thereby preventing the concentration of tensile stress. contamination are disliked.

【0032】図5(D)は、突起22がその初期形状において外周側へ傾いた形状、すなわち突起22の先端2
2cがバックアップリング2の外周面2cより大径となるように形成されたものである。 2c is formed so as to have a diameter larger than that of the outer peripheral surface 2c of the backup ring 2. この場合、バックアップリング2が圧力による軸方向荷重を受けた時に、外周側への突起22の倒れ込みが一層確実に行われるばかりでなく、初期から突起22が外周側への張り代を有するため、より確実に隙間δ を埋めることができる。 In this case, when the backup ring 2 receives an axial load due to pressure, not only the protrusion 22 is more reliably collapsed to the outer peripheral side, but also the protrusion 22 has a tension margin to the outer peripheral side from the initial stage. The gap δ 1 can be filled more reliably. また、突起22が外周側へ倒れ込んだ時にその断面全体が軸方向荷重によって完全に潰されるような形状である場合は、バックアップリング2とロッド4との隙間δ を埋めることができても、突起22が完全に潰されることによる反力によって、バックアップリング2とロッド4 Further, if the protrusion 22 has a shape such that the entire cross section is completely crushed by the axial load when the protrusion 22 collapses to the outer peripheral side, even if the gap δ 1 between the backup ring 2 and the rod 4 can be filled, The backup ring 2 and the rod 4 are caused by the reaction force caused by the protrusion 22 being completely crushed.
との摩擦が大きくなると共に、これに起因するスティックスリップが発生しやすくなるが、図5(D)のような形状とすることによって、このような不具合を防止することができる。 As the friction with the object increases, stick slip is likely to occur due to this, and such a problem can be prevented by forming the shape as shown in FIG. 5 (D). FIG. 5D shows a shape in which the projection 22 is inclined toward the outer peripheral side in the initial shape, that is, the tip 2 of the projection 22. FIG. 5D shows a shape in which the projection 22 is inclined toward the outer peripheral side in the initial shape, that is, the tip 2 of the projection 22.
2c is formed so as to be larger in diameter than the outer peripheral surface 2c of the backup ring 2. In this case, when the backup ring 2 receives an axial load due to pressure, the projection 22 not only falls down more reliably to the outer peripheral side, but also has an allowance for the projection 22 to extend to the outer peripheral side from the beginning. You can fill a gap [delta] 1 more reliably. Further, if the entire cross section is completely crushed by the axial load when the projection 22 falls down to the outer peripheral side, even if the gap δ 1 between the backup ring 2 and the rod 4 can be filled, The backup ring 2 and the rod 4 2c is formed so as to be larger in diameter than the outer peripheral surface 2c of the backup ring 2. In this case, when the backup ring 2 receives an axial load due to pressure, the projection 22 not only falls down more reliably to the outer peripheral side, but also has an allowance for the projection 22 to extend to the outer peripheral side from the beginning. You can fill a gap [delta] 1 more reliably. Further, if the entire cross section is completely crushed by the axial load when the projection 22 falls down to the outer peripheral side, even if the gap δ 1 between the backup ring 2 and the rod 4 can be filled, The backup ring 2 and the rod 4
Although the friction with this increases and stick-slip due to the friction easily occurs, such a problem can be prevented by forming the shape as shown in FIG. 5D. Although the friction with this increases and stick-slip due to the friction easily occurs, such a problem can be prevented by forming the shape as shown in FIG. 5D.

【0033】図5(E)は、バックアップリング2の外
周面2cと突起22の基部外周面22aとの間に、肉逃
がし溝23を形成したものである。例えばバックアップ
リング2とロッド4との間の隙間δが、突起22が外
周側へ倒れ込んだ時の径方向突出高さh’(図3参照)
より小さい場合は、外周側へ倒れ込んだ突起22はバッ
クアップリング2の外周面2cと取付溝32の底面32
aとの間で潰され、その反力によって、バックアップリング2とロッド4との摩擦が大きくなると共に、これに起因するスティックスリップが発生しやすくなるが、肉逃がし溝23を形成しておけば、突起22が外周側へ倒れ込んだ時の潰し量が小さくなるので、このような不具合を防止することができる。 It is crushed with a, and the reaction force increases the friction between the backup ring 2 and the rod 4, and stick slip is likely to occur due to this. However, if a meat relief groove 23 is formed, Since the amount of crushing when the protrusion 22 collapses to the outer peripheral side becomes small, such a problem can be prevented. FIG. 5E shows a groove 23 formed between the outer peripheral surface 2c of the backup ring 2 and the base outer peripheral surface 22a of the projection 22. For example, the gap δ 1 between the backup ring 2 and the rod 4 is the radial projection height h ′ when the projection 22 falls to the outer peripheral side (see FIG. 3). FIG. 5E shows a groove 23 formed between the outer peripheral surface 2c of the backup ring 2 and the base outer peripheral surface 22a of the projection 22. For example, the gap δ 1 between the backup ring 2 and the rod 4 is the radial projection height h ′ when the projection 22 falls to the outer peripheral side (see FIG. 3).
If it is smaller, the protrusion 22 that has fallen to the outer peripheral side is the outer peripheral surface 2 c of the backup ring 2 and the bottom surface 32 of the mounting groove 32. If it is smaller, the protrusion 22 that has fallen to the outer peripheral side is the outer peripheral surface 2 c of the backup ring 2 and the bottom surface 32 of the mounting groove 32.
a, the friction between the backup ring 2 and the rod 4 increases due to the reaction force, and stick-slip due to the friction tends to occur. However, if the meat escape groove 23 is formed, Since the amount of crushing when the protrusion 22 falls down to the outer peripheral side is reduced, such a problem can be prevented. a, the friction between the backup ring 2 and the rod 4 increases due to the reaction force, and stick-slip due to the friction tends to occur. However, if the meat escape groove 23 is formed, Since the amount of crushing when the protrusion 22 falls down to the outer peripheral side is reduced, such a problem can be prevented.

【0034】なお、図1、図2及び図4に示されるバッ
クアップリング2は、突起22が両端面2a,2bの外
周端部に形成されているが、これは先に説明したよう
に、取付溝32への挿入の際に突起22の向きを考慮す
る必要をなくすためのものであり、一方の端面にのみ突
起22を形成しても良いことは勿論である。
In the backup ring 2 shown in FIGS. 1, 2 and 4, the projections 22 are formed on the outer peripheral ends of both end faces 2a and 2b. This is to eliminate the need to consider the direction of the protrusion 22 when inserting the protrusion 22 into the groove 32, and it goes without saying that the protrusion 22 may be formed only on one end surface.

【0035】また、上述のように、突起22は圧力導入
空間Sの圧力による所定値以上の軸方向荷重によっ
て、外周側へ倒れ込むことで、バックアップリング2を
内周側へ変位させるが、圧力導入空間Sの圧力と、突
起22の剛性との関係によっては、図4(B)に示され
る状態に維持されるものである。
Further, as described above, the projections 22 by the axial load equal to or greater than a predetermined value by the pressure of the pressure introducing space S H, that fall down to the outer peripheral side, but is displaced to the inner circumferential side of the backup ring 2, the pressure and pressure introducing space S H, depending on the relationship between the rigidity of the projection 22 is intended to be maintained in the state shown in FIG. 4 (B).

【0036】次に、図6は、本発明による密封装置をロ
ッドシールとして用いた第二の実施の形態を、軸心を通
る平面で切断して示す半断面図、図7はこの実施の形態
におけるバックアップリングの一部を拡大して示す部分
断面図である。
Next, FIG. 6 is a half sectional view showing a second embodiment in which the sealing device according to the present invention is used as a rod seal, cut along a plane passing through an axis, and FIG. FIG. 4 is an enlarged partial cross-sectional view showing a part of the backup ring in FIG.

【0037】この第二の実施の形態において、第一の実
施の形態と異なる点は、上述した突起22に代えて、バ
ックアップリング2における取付溝32の底面32aと
の対向面である外周面2cに、突起24を形成したこと
にある。取付溝32へのバックアップリング2の未装着
状態では、図7に示されるように、突起24はほぼ径方
向へ延びており、その外径は、取付溝32の底面32a
よりも大径に形成されている。 It is formed with a larger diameter than. The second embodiment is different from the first embodiment in that, instead of the above-described projection 22, the outer peripheral surface 2c which is the surface facing the bottom surface 32a of the mounting groove 32 in the backup ring 2. That is, the projection 24 is formed. In a state where the backup ring 2 is not mounted in the mounting groove 32, as shown in FIG. 7, the projection 24 extends substantially in the radial direction. The second embodiment is different from the first embodiment in that, instead of the above-described projection 22, the outer peripheral surface 2c which is the surface facing the bottom surface 32a of the mounting groove 32 in the backup ring 2. That is, the projection 24 is formed. In a state where the backup ring 2 is not mounted in the mounting groove 32, as shown in FIG. 7, the projection 24 extends substantially in the radial direction.
It is formed larger than the diameter. It is formed larger than the diameter.

【0038】バックアップリング2を取付溝32に装着した状態では、突起24は倒れ込み変形を受け、その反力によって、バックアップリング2は、バックアップリング2とロッド4との間の隙間δ を縮小するように、
内周側へ向けて常時付勢される。 Always urged toward the inner circumference side. したがって、圧力導入空間S に油圧などの作動圧力が導入されていない無加圧状態でも、隙間δ を埋めることが可能である。 Therefore, even no pressure state operating pressure is not introduced, such as a hydraulic pressure introducing space S H, it is possible to fill the gap [delta] 1. [0038] In a state of mounting the backup ring 2 in the mounting groove 32, protrusion 24 is collapsing deformed by the reaction force thereof, the backup ring 2, to reduce the gap [delta] 1 between the backup ring 2 and the rod 4 like, [0038] In a state of mounting the backup ring 2 in the mounting groove 32, protrusion 24 is collapsing deformed by the reaction force thereof, the backup ring 2, to reduce the gap [delta] 1 between the backup ring 2 and the rod 4 like,
It is always urged toward the inner circumference. Therefore, even no pressure state operating pressure is not introduced, such as a hydraulic pressure introducing space S H, it is possible to fill the gap [delta] 1. It is always urged toward the inner circumference. Therefore, even no pressure state operating pressure is not introduced, such as a hydraulic pressure introducing space SH , it is possible to fill the gap [delta] 1.

【0039】この場合の突起24は、取付溝32へバッ
クアップリング2を装着する際に、倒れ込みが起こりや
すいように、比較的薄肉に形成することが好ましい。但
し、薄肉にするほど、温度条件等によっては早期にクリ
ープが起こりやすくなって、隙間δを埋める効果が損
なわれる恐れがあるため、クリープの起こりにくい比較
的低温条件で使用される密封装置において有効である。
In this case, the projection 24 is preferably formed to be relatively thin so that the projection 24 can easily fall down when the backup ring 2 is mounted in the mounting groove 32. However, the more thin, so early creep easily occurs in the temperature condition or the like, since it may impair the effect of filling the gap [delta] 1, the sealing device used in the unlikely relatively low temperature conditions Creep It is valid.

【0040】また、上記第二の実施の形態においては、
突起24が、バックアップリング2の外周面2cにおけ
る大気側空間S側の端部に位置して形成されている
が、この突起24の軸方向位置は、特に限定されない。
In the second embodiment,
The protrusion 24 is formed at an end of the outer peripheral surface 2c of the backup ring 2 on the atmosphere side space SL side, but the axial position of the protrusion 24 is not particularly limited.

【0041】なお、上述した各実施の形態による密封装
置は、取付溝32が外周側の部材であるハウジング3に
設けられ、これに装着されたシール本体1が内周側の部
材であるロッド4の外周面と摺接するものであるが、例
えばピストンシールのように、取付溝が内周側の部材
(ピストン)の外周面に形成され、シール本体1が外周
側の部材であるシリンダ等の内周面と摺接するものにつ
いては、バックアップリング2は、突起22又は24
を、図示のものと内外周逆の位置関係で形成すれば良い。 May be formed in a positional relationship opposite to that shown in the figure. In the sealing device according to each of the above-described embodiments, the mounting groove 32 is provided in the housing 3 which is an outer peripheral member, and the seal body 1 mounted on the housing 3 is a rod 4 which is an inner peripheral member. The mounting groove is formed on the outer peripheral surface of an inner peripheral member (piston), such as a piston seal, and the seal body 1 is an inner peripheral member such as a cylinder. For those which come into sliding contact with the peripheral surface, the backup ring 2 In the sealing device according to each of the above-described embodiments, the mounting groove 32 is provided in the housing 3 which is an outer peripheral member, and the seal body 1 mounted on the housing 3 is a rod 4 which is an inner peripheral The mounting groove is formed on the outer peripheral surface of an inner peripheral member (piston), such as a piston seal, and the seal body 1 is an inner peripheral member such as a cylinder. For those which come into sliding contact with the peripheral surface, the backup ring 2
May be formed in a positional relationship opposite to that shown in the figure. May be formed in a positional relationship opposite to that shown in the figure.

【0042】また、上述した各実施の形態による密封装
置において、突起22又は24は、円周方向へ連続した
形状であっても、断続した形状であっても良い。この場
合、円周方向へ連続した形状とするほうが加工は容易で
あるが、倒れ込みを容易にするためには、円周方向へ断
続した形状とすることが望ましい。
In the sealing device according to each of the above-described embodiments, the protrusion 22 or 24 may have a continuous shape or an intermittent shape in the circumferential direction. In this case, processing is easier if the shape is continuous in the circumferential direction, but it is preferable that the shape be interrupted in the circumferential direction in order to facilitate falling down.

【0043】[0043]

【発明の効果】請求項1の発明に係る密封装置によれ
ば、バックアップリングの端面に、一方の部材の取付溝
の隅部又はこの隅部近傍の端面と接触する突起が形成さ
れたものであるため、圧力を受けるシール本体からの軸
方向荷重によって、バックアップリングが突起を支点と
して応答性良く傾斜し、バックアップリングと他方の部
材との隙間を縮小するので、この隙間へのシール本体の
はみ出し及びこれに起因する「食われ」を有効に防止す
ることができる。また、圧力上昇時における前記隙間の
縮小を、バックアップリングに軟質のPTFEベースの
材料を用いることなく実現できるため、耐圧性の向上及
び材料コストの低減を図ることができ、更に、初期状態
から前記隙間を微小に設定する必要がないので、加工コ
ストの低減を図ることができる。
According to the sealing device of the first aspect of the present invention, the back-up ring has an end face formed with a projection which is in contact with a corner of the mounting groove of one of the members or an end face near the corner. Because of this, the backup ring inclines with good responsiveness around the protrusion by the axial load from the seal body that receives pressure, and reduces the gap between the backup ring and the other member, so that the seal body protrudes into this gap. And "eating" due to this can be effectively prevented. Further, since the gap can be reduced when the pressure is increased without using a soft PTFE-based material for the backup ring, it is possible to improve the pressure resistance and reduce the material cost. Since it is not necessary to set a small gap, the processing cost can be reduced.

【0044】請求項2の発明に係る密封装置によれば、
請求項1における突起が、所定値以上の軸方向荷重により取付溝の隅部側へ倒れてバックアップリングを他方の部材側へ変位させるものであるため、バックアップリングと他方の部材との隙間を縮小して、この隙間へのシール本体のはみ出し及びこれに起因する「食われ」を有効に防止することができる。 Since the protrusion according to claim 1 falls toward the corner of the mounting groove due to an axial load of a predetermined value or more and displaces the backup ring toward the other member, the gap between the backup ring and the other member is reduced. As a result, it is possible to effectively prevent the seal body from sticking out into the gap and the "eating" caused by the protrusion. また、圧力上昇が比較的小さい場合は、バックアップリングが突起を支点として傾斜することにより隙間を埋め、圧力上昇が比較的大きい場合は、上述のように突起が倒れてバックアップリングを他方の部材側へ変位させることにより隙間を埋めるものであるため、低圧用にも高圧用にも兼用でき、圧力条件によってバックアップリングの材料を変更するといった必要がない。 When the pressure rise is relatively small, the backup ring inclines with the protrusion as a fulcrum to fill the gap, and when the pressure rise is relatively large, the protrusion collapses and the backup ring is placed on the other member side as described above. Since the gap is filled by displacing to, it can be used for both low pressure and high pressure, and there is no need to change the material of the backup ring depending on the pressure conditions. According to the sealing device of the second aspect of the present invention, According to the sealing device of the second aspect of the present invention,
The protrusion according to claim 1 is to fall down to the corner of the mounting groove by an axial load equal to or more than a predetermined value to displace the backup ring toward the other member, so that the gap between the backup ring and the other member is reduced. As a result, it is possible to effectively prevent the seal main body from protruding into the gap and “eating” due to the protrusion. When the pressure rise is relatively small, the backup ring is inclined around the projection to fill the gap, and when the pressure rise is relatively large, the projection falls down and the backup ring is moved to the other member side as described above. Since the gap is filled by displacing the backup ring, it can be used for both low pressure and high pressure, and there is no need to change the material of the backup ring depending on the pressure condition. The protrusion according to claim 1 is to fall down to the corner of the mounting groove by an axial load equal to or more than a predetermined value to displace the backup ring toward the other member, so that the gap between the backup ring and the other member is reduced. As a result, it is possible to effectively prevent the seal main body from forming into the gap and “eating” due to the protrusion. When the pressure rise is relatively small, the backup ring is inclined around the projection to fill. Since the gap is filled by displacing the backup ring, it can be used for both low pressure. The gap, and when the pressure rise is relatively large, the projection falls down and the backup ring is moved to the other member side as described above. and high pressure, and there is no need to change the material of the backup ring depending on the pressure condition.

【0045】請求項3の発明に係る密封装置によれば、
請求項1又は2における突起の軸方向突出高さを(1)
式のように規定したため、バックアップリングがシール
本体に押されることによって突起を支点にして傾斜した
時に、その内周面におけるシール本体側の端部と他方の
部材との間で、隙間がほぼ0となるので、シール本体の
はみ出し及びこれに起因する「食われ」を確実に防止す
ることができる。
According to the sealing device of the third aspect of the present invention,
The protrusion height in the axial direction of the protrusion according to claim 1 or 2 is (1).
When the backup ring is pressed by the seal body and tilted with the projection as a fulcrum, the gap between the end of the seal body side on the inner peripheral surface and the other member is substantially zero. Therefore, the protrusion of the seal body and “eating” caused by the protrusion can be reliably prevented. When the backup ring is pressed by the seal body and tilted with the projection as a fulcrum, the gap between the end of the seal body side on the inner peripheral surface and the other member is substantially zero. Therefore, the protrusion of the seal body. and “eating” caused by the protrusion can be reliably prevented.

【0046】請求項3の発明に係る密封装置によれば、
バックアップリングに、一方の部材に形成した取付溝の底面と弾性的に接触してバックアップリングを他方の部材側へ付勢させる突起を形成したため、無加圧状態でも、バックアップリングと他方の部材との隙間を埋めることができ、この隙間へのシール本体のはみ出し及びこれに起因する「食われ」を有効に防止することができる。 Since the backup ring has a protrusion that elastically contacts the bottom surface of the mounting groove formed on one member to urge the backup ring toward the other member, the backup ring and the other member can be used even in a non-pressurized state. It is possible to fill the gap between the two, and it is possible to effectively prevent the seal body from sticking out into the gap and the “eating” caused by the protrusion. また、圧力上昇時における前記隙間の縮小を、バックアップリングに軟質のPTFEベースの材料を用いることなく実現できるため、耐圧性の向上及び材料コストの低減を図ることができ、更に、初期状態から前記隙間を微小に設定する必要がないので、加工コストの低減を図ることができる。 Further, since the reduction of the gap when the pressure rises can be realized without using a soft PTFE-based material for the backup ring, it is possible to improve the pressure resistance and reduce the material cost, and further, the above-mentioned from the initial state. Since it is not necessary to set a minute gap, the processing cost can be reduced. According to the sealing device of the third aspect of the present invention, According to the sealing device of the third aspect of the present invention,
The backup ring has a projection that elastically contacts the bottom surface of the mounting groove formed in one member and urges the backup ring toward the other member. Can be filled, and it is possible to effectively prevent the seal main body from protruding into the gap and “eating” caused by the protrusion. Further, since the gap can be reduced when the pressure is increased without using a soft PTFE-based material for the backup ring, it is possible to improve the pressure resistance and reduce the material cost. Since it is not necessary to set a small gap, the processing cost can be reduced. The backup ring has a projection that elastically contacts the bottom surface of the mounting groove formed in one member and urges the backup ring toward the other member. Can be filled, and it is possible to effectively prevent the seal main body from thereby into the gap. And “eating” caused by the protrusion. Further, since the gap can be reduced when the pressure is increased without using a soft PTFE-based material for the backup ring, it is possible to improve the pressure resistance and reduce the material cost. Since it is not necessary to set a small gap, the processing cost can be reduced.

【図面の簡単な説明】 [Brief description of the drawings]

【図1】本発明による密封装置をロッドシールとして用いた第一の実施の形態を、軸心を通る平面で切断して示す半断面図である。 FIG. 1 is a half sectional view showing a first embodiment in which a sealing device according to the present invention is used as a rod seal, cut along a plane passing through an axis.

【図2】上記第一の実施の形態によるバックアップリングを、軸心を通る平面で切断して示す断面図である。 FIG. 2 is a cross-sectional view of the backup ring according to the first embodiment, cut along a plane passing through an axis.

【図3】上記バックアップリングの一部を拡大して示す部分断面図である。 FIG. 3 is an enlarged partial sectional view showing a part of the backup ring.

【図4】上記第一の実施の形態による作用を、シール本体を省略して示す説明図で、(A)は初期状態、(B)
は低圧導入状態、(C)は高圧導入状態である。
FIGS. 4A and 4B are explanatory views showing the operation according to the first embodiment, omitting a seal body, wherein FIG. 4A is an initial state, and FIG.
Is a low pressure introduction state, and (C) is a high pressure introduction state.

【図5】上記バックアップリングにおける突起の断面形状の種々の例を示す部分断面図である。 FIG. 5 is a partial cross-sectional view showing various examples of a cross-sectional shape of a projection in the backup ring.

【図6】本発明による密封装置をロッドシールとして用いた第二の実施の形態を、軸心を通る平面で切断して示す半断面図である。 FIG. 6 is a half sectional view showing a second embodiment in which the sealing device according to the present invention is used as a rod seal, cut along a plane passing through an axis.

【図7】上記第二の実施の形態によるバックアップリングの一部を拡大して示す部分断面図である。 FIG. 7 is an enlarged partial sectional view showing a part of a backup ring according to the second embodiment.

【図8】従来の技術による密封装置の装着状態を、軸心を通る平面で切断して示す半断面図である。 FIG. 8 is a half sectional view showing a mounted state of a sealing device according to a conventional technique, cut along a plane passing through an axis.

【図9】上記従来の技術による密封装置において、使用時に圧力導入空間からの高圧が作用した状態を、軸心を通る平面で切断して示す半断面図である。 FIG. 9 is a half sectional view showing a state in which a high pressure from a pressure introducing space acts during use in the sealing device according to the conventional technique, cut along a plane passing through an axis.

【図10】従来の技術による他の密封装置の装着状態を、軸心を通る平面で切断して示す半断面図である。 FIG. 10 is a half sectional view showing a mounted state of another sealing device according to a conventional technique, cut along a plane passing through an axis.

【符号の説明】 [Explanation of symbols]

1 シール本体 11,12 シールリップ 2 バックアップリング 21 切断部 23 肉逃げ溝 22,24 突起 3 ハウジング(一方の部材) 31 内周面 32 取付溝 32b 隅部 4 ロッド(他方の部材) S 圧力導入空間 S 大気側空間DESCRIPTION OF SYMBOLS 1 Seal main body 11, 12 Seal lip 2 Backup ring 21 Cutting part 23 Meat escape groove 22, 24 Projection 3 Housing (one member) 31 Inner peripheral surface 32 Mounting groove 32b Corner 4 Rod (other member) SH pressure introduction Space SL Atmospheric space

Claims (4)

    【特許請求の範囲】 [Claims]
  1. 【請求項1】 互いに同心的に配置された二部材(3,
    4)のうち一方の部材(3)に形成された環状の取付溝(32)内に装着され他方の部材(4)と摺接されるシール本体(1)と、 前記取付溝(32)内に前記シール本体(1)の低圧側に配置されるバックアップリング(2)とを備え、 前記バックアップリング(2)の端面(2a)に、前記取付溝(32)の低圧側の隅部(32b)又はこの隅部(32b)近傍の端面と接触する突起(22)が形成されたことを特徴とする密封装置。
    1. Two members (3, 3) arranged concentrically with each other.

    4) a seal body (1) mounted in an annular mounting groove (32) formed in one member (3) and slidably in contact with the other member (4); A backup ring (2) disposed on the low pressure side of the seal body (1); and a low pressure side corner (32b) of the mounting groove (32) on an end face (2a) of the backup ring (2). Or a projection (22) for contacting the end face near the corner (32b). 4) a seal body (1) mounted in an annular mounting groove (32) formed in one member (3) and slidably in contact with the other member (4); A backup ring (2) disposed on the low pressure side of the seal body (1); and a low pressure side corner (32b) of the mounting groove (32) on an end face (2a) of the backup ring (2). Or a projection (22) for contacting the end face near the corner (32b).
  2. 【請求項2】 突起(22)が、所定値以上の軸方向荷重により取付溝(32)の隅部(32b)側へ倒れてバックアップリング(2)を他方の部材(4)側へ変位させることを特徴とする請求項1に記載の密封装置。 2. The projection (22) falls down to the corner (32b) side of the mounting groove (32) due to an axial load of a predetermined value or more and displaces the backup ring (2) toward the other member (4). The sealing device according to claim 1, wherein:
  3. 【請求項3】 バックアップリング(2)の軸方向肉厚をH、径方向幅をT、バックアップリング(2)と他方の部材(4)との間の隙間をδ とすると、突起(2
    2)の高さhが、 h=δ ・T/H であることを特徴とする請求項1又は2に記載の密封装置。 The sealing device according to claim 1 or 2, wherein the height h of 2) is h = δ 1 · T / H. Wherein the axial thickness of the backup ring (2) H, the radial width T, when the gap between the backup ring (2) and the other member (4) and [delta] 1, projections (2 Wherein the axial thickness of the backup ring (2) H, the radial width T, when the gap between the backup ring (2) and the other member (4) and [delta] 1, projections (2)
    The height h of 2) is h = (delta) 1 * T / H, The sealing device of Claim 1 or 2 characterized by the above-mentioned. The height h of 2) is h = (delta) 1 * T / H, The sealing device of Claim 1 or 2 characterized by the above-mentioned.
  4. 【請求項4】 互いに同心的に配置された二部材(3,
    4)のうち一方の部材(3)に形成された環状の取付溝(32)内に装着され他方の部材(4)と摺接されるシール本体(1)と、 前記取付溝(32)内に前記シール本体(1)の低圧側に配置されるバックアップリング(2)とを備え、 前記バックアップリング(2)に、前記底面(32a) A seal body (1) mounted in an annular mounting groove (32) formed in one of the members (3) of 4) and slidably contacted with the other member (4), and in the mounting groove (32). Is provided with a backup ring (2) arranged on the low pressure side of the seal body (1), and the backup ring (2) has a bottom surface (32a).
    と弾性的に接触して前記バックアップリング(2)を前記他方の部材(4)側へ付勢させる突起(24)が形成されたことを特徴とする密封装置。 A sealing device characterized in that a protrusion (24) is formed which elastically contacts the backup ring (2) to urge the backup ring (2) toward the other member (4). 4. Two members (3, 3) arranged concentrically with each other. 4. Two members (3, 3) arranged concentrically with each other.
    4) a seal body (1) mounted in an annular mounting groove (32) formed in one member (3) and slidably in contact with the other member (4); And a backup ring (2) disposed on the low pressure side of the seal body (1), wherein the backup ring (2) has a bottom surface (32a). 4) a seal body (1) mounted in an annular mounting groove (32) formed in one member (3) and slidably in contact with the other member (4); And a backup ring (2) disposed on the low pressure side of the seal body (1), wherein the backup ring (2) has a bottom surface (32a).
    A projection (24) formed so as to elastically contact the backup ring (2) toward the other member (4) by being elastically contacted with the sealing member. A projection (24) formed so as to elastically contact the backup ring (2) toward the other member (4) by being elastically contacted with the sealing member.
JP2001075582A 2001-03-16 2001-03-16 Sealing device Pending JP2002276814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001075582A JP2002276814A (en) 2001-03-16 2001-03-16 Sealing device

Publications (1)

Publication Number Publication Date
JP2002276814A true JP2002276814A (en) 2002-09-25

Family

ID=18932638

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
JP (1) JP2002276814A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004211831A (en) * 2003-01-07 2004-07-29 Kubota Corp Pipe joint structure
JP2006177556A (en) * 2004-12-21 2006-07-06 Rft Spa Seal device for shock absorber
JP2008069792A (en) * 2006-09-12 2008-03-27 Nok Corp Backup ring
JP2008089095A (en) * 2006-10-03 2008-04-17 Kubota Corp Pipe joint and backup ring used for the same
WO2010098001A1 (en) * 2009-02-24 2010-09-02 Nok株式会社 Sealing device
WO2012124534A1 (en) * 2011-03-11 2012-09-20 Nok株式会社 Sealing device
CN104214347A (en) * 2014-08-27 2014-12-17 无锡同心塑料制品有限公司 Sealing device between two objects of performing relative reciprocating motion
JP2017032076A (en) * 2015-08-03 2017-02-09 三菱電線工業株式会社 Shaft seal
KR20170041908A (en) * 2014-08-15 2017-04-17 트렐레보르크 씰링 솔루션즈 저머니 게엠베하 Seal Arrangement Having a Damping Element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187961U (en) * 1981-05-26 1982-11-29
JPH08135795A (en) * 1994-11-14 1996-05-31 Nok Corp Sealing device
JPH11270691A (en) * 1998-03-18 1999-10-05 Nok Corp Sealing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57187961U (en) * 1981-05-26 1982-11-29
JPH08135795A (en) * 1994-11-14 1996-05-31 Nok Corp Sealing device
JPH11270691A (en) * 1998-03-18 1999-10-05 Nok Corp Sealing device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004211831A (en) * 2003-01-07 2004-07-29 Kubota Corp Pipe joint structure
JP2006177556A (en) * 2004-12-21 2006-07-06 Rft Spa Seal device for shock absorber
JP2008069792A (en) * 2006-09-12 2008-03-27 Nok Corp Backup ring
JP2008089095A (en) * 2006-10-03 2008-04-17 Kubota Corp Pipe joint and backup ring used for the same
WO2010098001A1 (en) * 2009-02-24 2010-09-02 Nok株式会社 Sealing device
JP2010196751A (en) * 2009-02-24 2010-09-09 Nok Corp Sealing device
US8474829B2 (en) 2009-02-24 2013-07-02 Nok Corporation Sealing device
WO2012124534A1 (en) * 2011-03-11 2012-09-20 Nok株式会社 Sealing device
KR20170041908A (en) * 2014-08-15 2017-04-17 트렐레보르크 씰링 솔루션즈 저머니 게엠베하 Seal Arrangement Having a Damping Element
KR102003887B1 (en) * 2014-08-15 2019-07-25 트렐레보르크 씰링 솔루션즈 저머니 게엠베하 A Seal Arrangement, a Shock Damper having the Seal Arrangement and a Hydraulic Actuator having the Seal Arrangement
US10690213B2 (en) 2014-08-15 2020-06-23 Trelleborg Sealing Solutions Germany Gmbh Seal arrangement with damping element
CN104214347A (en) * 2014-08-27 2014-12-17 无锡同心塑料制品有限公司 Sealing device between two objects of performing relative reciprocating motion
JP2017032076A (en) * 2015-08-03 2017-02-09 三菱電線工業株式会社 Shaft seal
CN106402393A (en) * 2015-08-03 2017-02-15 三菱电线工业株式会社 Shaft sealing member

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