WO2011105513A1 - シールリング - Google Patents
シールリング Download PDFInfo
- Publication number
- WO2011105513A1 WO2011105513A1 PCT/JP2011/054184 JP2011054184W WO2011105513A1 WO 2011105513 A1 WO2011105513 A1 WO 2011105513A1 JP 2011054184 W JP2011054184 W JP 2011054184W WO 2011105513 A1 WO2011105513 A1 WO 2011105513A1
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- WIPO (PCT)
- Prior art keywords
- seal ring
- sealed
- fluid
- annular groove
- shaft
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/441—Free-space packings with floating ring
Definitions
- the present invention relates to a seal ring that seals an annular gap between two members that are rotatable relative to each other.
- FIGS. 8A to 10C A seal ring according to a conventional example will be described with reference to FIGS. 8A to 10C.
- 8A and 8B are schematic views showing a configuration of a seal ring according to Conventional Example 1
- FIG. 8A is a view showing a part of a side surface of the seal ring
- FIG. 8B is a CC sectional view of FIG. 8A.
- 9A to 9C are schematic views showing the structure of a seal ring according to Conventional Example 2
- FIG. 9A is a view showing a part of a side surface of the seal ring
- FIG. 9B is a cross-sectional view taken along arrow D in FIG. 9A
- FIG. FIG. 9B is an EE sectional view of FIG. 9A.
- FIG. 10A and 10B are schematic views showing a configuration of a seal ring according to Conventional Example 3
- FIG. 10A is a view showing a part of a side surface of the seal ring
- FIG. 10B is a cross-sectional view taken along the line FF in FIG. 10A.
- the seal ring 100a according to the conventional example 1 is provided with a groove 102a inclined in a conical shape on the sliding surface 101 (see Patent Document 1).
- a wedge-shaped gap is formed between the side surface 31 of the annular groove 30 of the shaft 3 and the seal ring 100a.
- the seal ring 100b according to Conventional Example 2 shown in FIGS. 9A to 9C is also configured to generate a wedge effect by providing a groove 102b having an inclined surface on the sliding surface 101, as in Conventional Example 1.
- Patent Document 2 discloses a wedge effect by providing a groove 102b having an inclined surface on the sliding surface 101, as in Conventional Example 1.
- the seal ring 100c according to Conventional Example 3 is provided with a screw-shaped notch groove 102c (see Patent Document 3).
- P10 is increased by increasing the pressure in the gap (generation of dynamic pressure) by the fluid to be sealed flowing into the minute gap formed between the screw-shaped fine notch groove 102c and the side surface 31 (dynamic pressure generation). It is configured.
- Patent Documents 4 to 7 Other various configurations have been proposed.
- the wedge-shaped gap formed between the grooves 102a and 102b and the side surface 31 in the conventional examples 1 and 2 is the inner peripheral surface of the seal ring facing the region to be sealed (O). Since the opening 103 is large, the fluid to be sealed easily enters and leaves the gap. Therefore, there is a problem that a flow of the fluid to be sealed that escapes from the gap without contributing to the generation of dynamic pressure due to the wedge effect is likely to be formed, and the desired wedge effect may not be obtained.
- the gap formed by the notch groove 102c and the side surface 31 in the conventional example 3 has no outlet on the downstream side in the flow direction of the fluid to be sealed, and the fluid to be sealed has entered. It is difficult to escape. This facilitates positive introduction of the fluid to be sealed into the sliding area of the sliding surface 101.
- the length of the notch groove 102c is limited due to the restriction of the protruding gap G (the leakage increases when the groove 102c leads to the non-sealing target region (A), so that it exceeds the protruding gap G).
- the groove 102c cannot be extended.
- the amount of the fluid to be sealed that can be introduced is limited.
- the fluid to be sealed flows substantially in the outer diameter direction, and slides from the tip of the groove 102c with the flow. It is introduced into the sliding area of the surface 101. For this reason, the sealing target fluid introduced into the sliding region is likely to leak from the protruding gap G to the non-sealing target region (A), and it may not be possible to reduce the sliding resistance as expected.
- the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a seal ring capable of obtaining a torque reduction effect more stably.
- the seal ring in the present invention comprises: A seal ring that seals an annular gap between a housing provided to be rotatable relative to each other and a shaft inserted through a shaft hole of the housing; It is attached to an annular groove provided on one surface of the housing or the shaft, and is pressed against the side surface of the annular groove and the other surface of the shaft hole or the shaft by the pressure of the fluid to be sealed. And In a seal ring in which a recess that is spaced from the side surface of the annular groove is formed in a sliding region with the side surface of the annular groove so as to generate a force that opposes a force pressed against the side surface of the annular groove by the action of the pressure.
- the concave portion includes an arc-shaped portion extending along the circumferential direction inside the sliding region, and the arc-shaped portion from an end of the sliding region adjacent to the sealing target region to guide the sealing target fluid to the arc-shaped portion. And an introduction portion extending to an end portion on the upstream side in the flow direction of the fluid to be sealed.
- the fluid to be sealed flows into one end of the arc-shaped portion through the introduction portion that opens the gap to the region to be sealed, and the other end of the arc-shaped portion along the arc-shaped portion extending in the circumferential direction inside the sliding region. That is, it flows toward the end opposite to the end connected to the introduction portion.
- the other end of the arcuate portion terminates in the sliding area. Therefore, the pressure in the gap is increased by the fluid to be sealed that reaches the other end of the arcuate portion and has no place to go (generation of dynamic pressure), and the force for pulling the seal ring away from the side surface of the annular groove is increased. As a result, the fluid to be sealed is easily introduced into the sliding region, and the sliding resistance is reduced.
- the concave portion of the seal ring in the present invention terminates by forming a flow along the circumferential direction in the fluid to be sealed that has flowed into the concave portion (arc-shaped portion).
- the fluid to be sealed that flows in the concave portion is easily introduced into the sliding region from the end of the arc-shaped portion (tip of the concave portion) with a flow along the circumferential direction, and the fluid to be sealed to the sliding region is
- the lubricating film can be formed stably. That is, since it is not introduced into the sliding region with a flow toward the non-sealing target region side, it is suppressed that the sealing target fluid introduced into the sliding region immediately leaks out to the non-sealing target region side. .
- the depth of the concave portion may decrease as it goes in the flow direction of the fluid to be sealed. Furthermore, the arc-shaped portion may have a width that decreases in the flow direction of the fluid to be sealed.
- the gap formed by the recess and the side surface of the annular groove is configured to gradually narrow in a wedge shape toward the downstream in the flow direction of the fluid to be sealed.
- the introduction part extends while being inclined in the flow direction of the fluid to be sealed from the end of the sliding region toward the end of the arcuate part.
- FIG. The schematic diagram which looked at the seal ring which concerns on Example 1 of this invention from the axial direction.
- FIG. The schematic diagram which shows a part of side surface of a seal ring.
- BB sectional drawing of FIG. 2A The typical cross section which shows the wearing state of a seal ring.
- Sectional drawing of a step-shaped recessed part Sectional drawing of a curved-surface-shaped recessed part.
- the schematic diagram which shows the structure of the recessed part of the seal ring which concerns on Example 2 of this invention.
- the schematic diagram which shows the structure of the recessed part of the seal ring which concerns on Example 3 of this invention.
- FIG. CC sectional drawing of FIG. 8A The figure which shows a part of side surface of the seal ring which concerns on the prior art example 2.
- FIG. 9D is a cross-sectional view taken along arrow D in FIG. 9A.
- EE sectional drawing of FIG. 9A The figure which shows a part of side surface of the seal ring which concerns on the prior art example 3.
- FIGS. 1A to 4B are schematic views showing an overall configuration of a seal ring according to Embodiment 1 of the present invention.
- FIG. 1A is a schematic view (plan view) of the seal ring viewed from the axial direction
- FIG. It is A arrow directional view of 1A, and has shown the partial cross section.
- 2A and 2B are schematic views showing the configuration of the recess
- FIG. 2A is a schematic view showing a part of a side surface of the seal ring
- FIG. 2B is a cross-sectional view taken along the line BB in FIG. 2A.
- FIG. 1A is a schematic view (plan view) of the seal ring viewed from the axial direction
- FIG. It is A arrow directional view of 1A, and has shown the partial cross section.
- 2A and 2B are schematic views showing the configuration of the recess
- FIG. 2A is a schematic view showing a part of a side surface of the seal ring
- FIG. 2B is
- FIG. 3 is a schematic determination surface in a state where the seal ring according to the embodiment of the present invention is mounted.
- 4A and 4B are schematic cross-sectional views illustrating a configuration of a modified example of the concave portion, in which FIG. 4A is a step-shaped concave portion and FIG. 4B is a cross-sectional view of the curved concave portion.
- the seal ring 1 is an annular member provided with a separation portion S at one place on the circumference, such as tetrafluoroethylene (PTFE), polyetheretherketone (PEEK), and the like. It is comprised from the resin material.
- PTFE tetrafluoroethylene
- PEEK polyetheretherketone
- the seal ring 1 seals the annular gap 4 between the shaft hole 20 of the housing 2 and the shaft 3 inserted into the shaft hole 20.
- the seal ring 1 is a seal ring having a substantially rectangular cross section having side surfaces 10 and 12 perpendicular to the axis, and an outer peripheral surface 11 and an inner peripheral surface 13 parallel to the axis.
- the seal ring 1 is attached to an annular groove 30 provided on the outer peripheral surface of the shaft 3, and the side surface 10 on the non-sealing target region side (A) is formed into the annular groove 30 by the action of the pressure P on the sealing target region side (O).
- the outer peripheral surface 11 is in close contact with the inner peripheral surface 21 of the shaft hole 20.
- the fluid to be sealed is, for example, lubricating oil, and in particular, an ATF in the case of an automatic transmission of an automobile.
- the seal ring 1 has a recess 14 formed on the side surface 10 which is a sliding surface with the side surface 31 of the annular groove 30.
- the concave portion 14 is provided in a sliding area of the side surface 10 with the side surface 31. A part of the sliding region is separated from the side surface 31 by the concave portion 14, so that the sliding area is reduced and a force (the seal ring 1 is moved from the side surface 31) against the force P ⁇ b> 1 pressed against the side surface 31 by the action of the pressure P. A force P2) is generated.
- the seal ring 1 employs a conventionally known step cut shape as the separation portion S.
- the separation portion S the convex portion provided at one end of the seal ring and the convex portion provided at the other end are combined with each other.
- the separation part S is joined by the fitting of the convex part and the concave part, and an annular seal ring 1 is formed.
- a sliding seal surface that is slidable in the circumferential direction is formed in the fitting portion of the separation portion S by contacting the side surface of the convex portion and the side surface of the concave portion.
- a gap capable of absorbing a change in the circumferential length of the seal ring 1 is formed between the tip surface of the convex portion and the bottom surface of the concave portion.
- separation part S it is not restricted to this, The various form which is a prior art is employable.
- the recess 14 is a substantially L-shaped groove, and includes an arcuate portion 14a extending along the circumferential direction and an inner peripheral surface 13 of the sliding region from one end of the arcuate portion 14a. And an introduction portion 14b that extends to the boundary and opens in the inner peripheral surface 13 as well.
- the arc length L of the concave arcuate portion 14a is 10 ° to the circumferential length of 360 ° of the seal ring 1 in consideration of the length for obtaining a desired dynamic pressure generation effect, the length of the separation portion S, and the like. The range is set to 170 °.
- a plurality of the recesses 14 are arranged side by side along the circumferential direction of the side surface 10.
- Such a recess 14 forms a gap that opens in the region to be sealed (O) between the seal ring 1 and the side surface 31 in the sliding region of the side surface 10.
- the fluid to be sealed flows in the direction opposite to the direction in which the seal ring 1 rotates (arrow R) by the relative rotation of the housing 2 and the shaft 3.
- the introduction part 14b is connected to the upstream end of the arcuate part 14a in the flow direction of the fluid to be sealed, and the fluid to be sealed flows from the introduction part 14b and flows in the arcuate part 14a in the circumferential direction.
- the recess 14 (arc-shaped portion 14a) is configured such that the depth decreases as it goes in the flow direction of the fluid to be sealed.
- the clearance gap formed between the recessed part 14 and the side surface 31 is formed so that it may narrow gradually in a wedge shape toward the downstream of the flow direction of the fluid to be sealed.
- FIGS. 4A and 4B various forms can be adopted for the change in the depth of the recess 14 (arc-shaped portion 14a). That is, as shown to FIG. 4A, it is good also as a step-shaped bottom face from which a depth changes to a step shape. Moreover, as shown to FIG. 4B, it is good also as a curved-surface-shaped bottom surface from which depth changes to curve shape. Although not shown, the depth may be changed by combining a plurality of surfaces having different inclination angles.
- the pressure in the gap is increased by the fluid to be sealed that reaches the other end of the arcuate portion 14a and has no place to go (generation of dynamic pressure), and the force P2 that pulls the seal ring 1 away from the annular groove side surface 31 is increased.
- the fluid to be sealed is introduced into the sliding region, and a lubricating film is formed by the fluid to be sealed between the side surface 10 of the seal ring 1 and the side surface 31 of the annular groove 30, and the sliding resistance is reduced.
- the concave portion 14 terminates by forming a flow along the circumferential direction in the fluid to be sealed that has flowed into the concave portion 14 (arc-shaped portion 14a).
- the fluid to be sealed flowing in the recess 14 is easily introduced into the sliding region from the end of the arcuate portion 14a with a flow along the circumferential direction, and the lubricating film by the fluid to be sealed on the sliding region Can be formed stably. That is, since it is not introduced into the sliding region with a flow toward the non-sealing target region (A), the fluid to be sealed introduced into the sliding region immediately leaks to the non-sealing target region (A) side. This is suppressed.
- the gap formed between the recess 14 and the side surface 31 is configured to gradually narrow in a wedge shape toward the downstream in the flow direction of the fluid to be sealed. 14b) A wedge effect is generated in the fluid to be sealed flowing in the inside, and the force P2 for separating the seal ring 1 from the annular groove side surface 31 can be generated more stably.
- the torque reduction effect can be obtained more stably. Further, since the torque reduction effect is stabilized, it is possible to stably obtain the effect of suppressing sliding heat generation, and use under further high PV conditions is possible. Further, since the formation of the lubricating film by the fluid to be sealed is stabilized, it is possible to use a lightweight soft material as the material of the shaft and the housing, which can contribute to the weight reduction of the target device.
- FIG. 5 is a schematic diagram illustrating a configuration of a recess of the seal ring according to the second embodiment.
- first embodiment Only differences from the first embodiment will be described, and descriptions of common configurations will be omitted.
- the seal ring according to the second embodiment is configured such that the width of the arcuate portion 14a ′ decreases as it goes in the flow direction of the fluid to be sealed. That is, the radial width d on one end side that becomes the entrance of the arcuate portion 14a ′ is wide, and the radial width c on the other end side is narrow.
- a wedge effect due to the fluid to be sealed flowing in the recess 14 (arc-shaped portion 14b) is likely to be generated, and the force P2 for pulling the seal ring 1 away from the annular groove side surface 31 can be stably generated. Can do.
- the flow of the fluid to be sealed is concentrated toward the end of the arcuate portion 14a ′, and the introduction of the fluid to be sealed into the sliding region around the end of the arcuate portion 14a ′ and the formation of the lubricating film are promoted. Is done.
- FIG. 6 is a schematic diagram illustrating the configuration of the recess of the seal ring according to the third embodiment. Here, only differences from the above embodiment will be described, and descriptions of common configurations will be omitted.
- the seal ring according to the third embodiment includes a second recess 14 ′ having a configuration that is symmetrical with respect to the first recess 14 in the circumferential direction.
- the second recess 14 ′ is different from the first recess 14 in the position where the introduction portion 14 b is provided.
- the change in the depth of the groove has a symmetrical configuration opposite to that of the first recess 14. That is, the second recess 14 ′ is configured to generate dynamic pressure (wedge effect) when the flow direction of the fluid to be sealed is opposite to that of the first recess 14. Therefore, according to the seal ring according to the present embodiment, it is possible to obtain the dynamic pressure generation effect due to the concave portion regardless of the relative rotation between the housing 2 and the shaft 3.
- FIG. 7 is a schematic diagram illustrating the configuration of the recess of the seal ring according to the fourth embodiment.
- FIG. 7 is a schematic diagram illustrating the configuration of the recess of the seal ring according to the fourth embodiment.
- the introduction part 14b ′ of the recess 14 is inclined in the flow direction of the fluid to be sealed from the end of the sliding region toward the end of the arcuate part 14a. It is provided to extend. Thereby, the inflow of the fluid to be sealed into the introduction portion 14b ′ becomes smooth, and the dynamic pressure (wedge effect) by the concave portion 14 can be generated more stably.
- Seal ring 10 Side surface (sliding surface) DESCRIPTION OF SYMBOLS 11 Outer peripheral surface 12 Side surface 13 Inner peripheral surface 14 Recessed part 14a Arc-shaped part 14b Introduction part 2 Housing 20 Axis hole 21 Inner peripheral surface 3 Axis 30 Ring groove 31 Side face 4 Ring gap
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Abstract
Description
互いに相対回転自在に設けられたハウジングと該ハウジングの軸孔に挿通された軸との間の環状隙間を密封するシールリングであって、
前記ハウジングまたは前記軸のうちの一方の表面に設けられた環状溝に装着され、密封対象流体の圧力によって前記環状溝の側面と前記軸孔または前記軸のうちの他方の表面にそれぞれ押し付けられるように構成されるとともに、
前記圧力の作用によって前記環状溝の側面に押し付ける力に抗する力を生じるように、前記環状溝の側面との摺動領域に前記環状溝の側面から離間する凹部を形成されたシールリングにおいて、
前記凹部は、前記摺動領域の内側を周方向に沿って延びる円弧状部と、該円弧状部まで密封対象流体を導くべく密封対象領域に隣接する前記摺動領域の端から前記円弧状部における密封対象流体の流動方向上流側の端部まで延びる導入部と、を有することを特徴とする。
図1A~図4Bを参照して本発明の実施例1に係るシールリングについて説明する。図1A及び図1Bは、本発明の実施例1に係るシールリングの全体構成を示す模式図であり、図1Aはシールリングを軸方向から見た模式図(平面図)、図1Bは、図1AのA矢視図であり、一部断面を示している。図2A及び図2Bは、凹部の構成を示す模式図であり、図2Aはシールリングの側面の一部を示す模式図、図2Bは図2AのBB断面図である。図3は、本発明の実施例に係るシールリングの装着状態における模式的判断面である。図4A及び図4Bは、凹部の変形例の構成を示す模式的断面図であり、図4Aは段差状凹部、図4Bは曲面状凹部の断面図である。
図1A及び図1Bに示すように、シールリング1は、円周上の一箇所に分離部Sが設けられた環状部材であり、四フッ化エチレン(PTFE)、ポリエーテルエーテルケトン(PEEK)等の樹脂材から構成されている。
図2Aに示すように、凹部14は、略L字状の溝であり、周方向に沿って延びる円弧状部14aと、該円弧状部14aの一端から摺動領域の内周面13との境まで延びて内周面13にも開口する導入部14bと、を有している。凹円弧状部14aの円弧長Lは、所望の動圧発生効果を得るための長さや分離部Sの長さ等を考慮して、シールリング1の周長の360°に対して10°~170°となるような範囲で設定される。凹部14は、図1Aに示すように、側面10の周方向に沿って複数並べて配置される。
密封対象領域(O)内を流動する密封対象流体の一部は、内周面13に開口する導入部14bを介して、凹部14と側面31との間に形成される隙間に流入する。密封対象流体は、周方向に延びる円弧状部14aの一端から他端まで周方向に沿って流動する。円弧状部14aの他端(密封対象流体の流動方向下流側の端部)は側面10における摺動領域の内側で終端している。そのため、円弧状部14aの他端まで達して行き場のなくなった密封対象流体により隙間内の圧力が高まり(動圧の発生)、シールリング1を環状溝側面31から引き離す力P2が高められる。これにより、摺動領域に密封対象流体が導入されシールリング1の側面10と環状溝30の側面31との間に密封対象流体による潤滑膜が形成され、摺動抵抗の低減が図られる。
図5を参照して、本発明の実施例2に係るシールリングについて説明する。図5は、実施例2に係るシールリングの凹部の構成を示す模式図である。ここでは、実施例1と異なる点についてのみ説明し、共通する構成についての説明は省略する。
図6を参照して、本発明の実施例3に係るシールリングについて説明する。図6は、実施例3に係るシールリングの凹部の構成を示す模式図である。ここでは、上記実施例と異なる点についてのみ説明し、共通する構成についての説明は省略する。
図7を参照して、本発明の実施例4に係るシールリングについて説明する。図7は、実施例4に係るシールリングの凹部の構成を示す模式図である。ここでは、上記実施例と異なる点についてのみ説明し、共通する構成についての説明は省略する。
上記各実施例では、シールリング1が軸3の外周面に設けられた環状溝30に装着される構成について説明したが、ハウジング2の軸孔20の内周面21に設けられた環状溝に装着され、軸3の外周面と摺動して環状隙間4を密封する構成であってもよい。
10 側面(摺動面)
11 外周面
12 側面
13 内周面
14 凹部
14a 円弧状部
14b 導入部
2 ハウジング
20 軸孔
21 内周面
3 軸
30 環状溝
31 側面
4 環状隙間
Claims (4)
- 互いに相対回転自在に設けられたハウジングと該ハウジングの軸孔に挿通された軸との間の環状隙間を密封するシールリングであって、
前記ハウジングまたは前記軸のうちの一方の表面に設けられた環状溝に装着され、密封対象流体の圧力によって前記環状溝の側面と前記軸孔または前記軸のうちの他方の表面にそれぞれ押し付けられるように構成されるとともに、
前記圧力の作用によって前記環状溝の側面に押し付ける力に抗する力を生じるように、前記環状溝の側面との摺動領域に前記環状溝の側面から離間する凹部を形成されたシールリングにおいて、
前記凹部は、前記摺動領域の内側を周方向に沿って延びる円弧状部と、該円弧状部まで密封対象流体を導くべく密封対象領域に隣接する前記摺動領域の端から前記円弧状部における密封対象流体の流動方向上流側の端部まで延びる導入部と、を有することを特徴とするシールリング。 - 前記凹部は、密封対象流体の流動方向に向かうにつれて深さが減少することを特徴とする請求項1に記載のシールリング。
- 前記円弧状部は、密封対象流体の流動方向に向かうにつれて幅が減少することを特徴とする請求項1または2に記載のシールリング。
- 前記導入部は、前記摺動領域の端から前記円弧状部の前記端部に向かって密封対象流体の流動方向に傾いて延びることを特徴とする請求項1から3のいずれかに記載のシールリング。
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JP2012501862A JPWO2011105513A1 (ja) | 2010-02-26 | 2011-02-24 | シールリング |
CN201180003565XA CN102483162A (zh) | 2010-02-26 | 2011-02-24 | 密封环 |
US13/259,515 US20120018957A1 (en) | 2010-02-26 | 2011-02-24 | Seal ring |
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JP2010041976 | 2010-02-26 | ||
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Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013094657A1 (ja) * | 2011-12-23 | 2013-06-27 | 株式会社リケン | シールリング |
WO2013094654A1 (ja) * | 2011-12-23 | 2013-06-27 | 株式会社リケン | シールリング |
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US20120018957A1 (en) | 2012-01-26 |
JPWO2011105513A1 (ja) | 2013-06-20 |
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