JP2005030537A - Seal member and gas spring - Google Patents

Seal member and gas spring Download PDF

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JP2005030537A
JP2005030537A JP2003272692A JP2003272692A JP2005030537A JP 2005030537 A JP2005030537 A JP 2005030537A JP 2003272692 A JP2003272692 A JP 2003272692A JP 2003272692 A JP2003272692 A JP 2003272692A JP 2005030537 A JP2005030537 A JP 2005030537A
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cylinder
seal member
piston rod
seal
rod guide
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JP4113810B2 (en
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Kiyoshi Kani
清 可児
Chikashi Imoto
智可至 井元
Etsuro Nakada
悦郎 中田
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KYB Corp
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Kayaba Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal member capable of surely charging gas and a gas spring having the seal member between a piston rod and a cylinder. <P>SOLUTION: An annular seal member 5 seals between one member 2 and other member 1 while the seal member is seated on a seat member 24 arranged between the one member 2 and the other member 1. A slant face 5e or a curved face going away from the one member 2 is formed on at least a part of a face between a contact portion 5f bringing into contact with the one member 2 of the seal member 5 and the face of an end 6 opposite to the seat member 24. An annular projection 5d seated on the seat member 24 is arranged on the end 6 opposite to the seat member 24 of the seal member 5 at an one member 2 side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、シール部材およびピストンロッドとシリンダとの間にシール部材を設けたガススプリングに関する。   The present invention relates to a gas spring in which a seal member is provided between a seal member and a piston rod and a cylinder.

従来、この種シール部材は、いわゆるガススプリングや油圧緩衝器のシリンダ内を密封状態下に保持するために使用されており、たとえば、ガススプリングや油圧緩衝器のシリンダと、シリンダに挿通されるピストンロッドとの間に配在され、シリンダ内方側に開口する凹部を有する環状に形成され、凹部を境としてピストンロッドに当接する内周側リップとシリンダに当接する外周側リップとを備えたＵパッキンや、さらに、このＵパッキンの内周側下方にピストンロッドに当接するダストリップを設けたものが知られている。   Conventionally, this type of sealing member has been used to keep the inside of a cylinder of a so-called gas spring or hydraulic shock absorber in a sealed state. For example, a cylinder of a gas spring or a hydraulic shock absorber and a piston inserted through the cylinder U which is arranged between the rod and is formed in an annular shape having a recess opening on the inner side of the cylinder, and includes an inner peripheral lip that contacts the piston rod and an outer peripheral lip that contacts the cylinder with the recess as a boundary. There is known a packing, and further, a dust lip which is in contact with a piston rod is provided below the inner periphery of the U packing.

そして、上述のシール部材を備えたガススプリングのシリンダ内にガスを封入する方法として、シリンダの上端開口部からガスを充填し、シリンダの上端開口部をプラグで塞ぐ方法（たとえば、特許文献１参照）があり、上述のシール部材を備えた油圧緩衝器のシリンダ内にガスを封入する方法として、ダストリップを押し開くパイプ状のスリーブを挿入しスリーブ内にガスを送り込み内周側リップを撓ませてできた内周側リップとピストンロッドとの間の隙間からシリンダ内にガスを封入する方法（たとえば、特許文献２参照）が提案されている。   And as a method of sealing gas in the cylinder of the gas spring provided with the above-mentioned sealing member, a method of filling gas from the upper end opening of the cylinder and closing the upper end opening of the cylinder with a plug (see, for example, Patent Document 1) As a method of sealing gas into the cylinder of the hydraulic shock absorber having the above-mentioned sealing member, a pipe-shaped sleeve that pushes the dust lip is inserted, gas is fed into the sleeve, and the inner peripheral lip is bent. A method has been proposed in which gas is sealed in a cylinder through a gap between the inner peripheral lip and the piston rod (for example, see Patent Document 2).

しかしながら、上記ガススプリングのシリンダ内にガスを封入する方法では、ガスを充填した後にプラグをシリンダ開口部に溶接等により蓋をする必要があるので、この点でガス封入費用が高価となり、また、油圧緩衝器のシリンダ内にガスを封入する方法ではピストンロッドとシール部材との間にスリーブを挿入する必要があるが、内径の小さいロッドガイドをシリンダ端部に配置するガススプリングには適用できない。   However, in the method of sealing the gas in the cylinder of the gas spring, it is necessary to cover the plug by welding or the like after the gas is filled, so that the gas sealing cost becomes expensive in this respect, In the method of enclosing gas in the cylinder of the hydraulic shock absorber, it is necessary to insert a sleeve between the piston rod and the seal member, but it cannot be applied to a gas spring in which a rod guide having a small inner diameter is arranged at the end of the cylinder.

そこで、近年ではシール部材を上記ダストリップを設けない、いわゆるＵパッキンとして、スリーブを用いずにＵパッキンの内周側にガスを送り込み、内周側リップを撓ませてできた内周側リップとピストンロッドとの間の隙間からシリンダ内にガスを封入する方法の提案がなされるに至っている。
特開平１０−２８８２３５号公報（第２頁左欄第３４行目から第３７行目まで、図２（Ａ）） 特開昭５６−４２７３３号公報（第３頁右上欄台９行目から第３頁右下欄第３頁目まで、図３） Therefore, in recent years, the seal member is not provided with the above-mentioned dust lip, so-called U-packing, and an inner peripheral lip formed by feeding gas into the inner peripheral side of the U-packing without using a sleeve and bending the inner peripheral lip; Proposals have been made for a method of sealing gas into a cylinder through a gap between the piston rod and the piston rod.
Japanese Patent Laid-Open No. 10-288235 (page 2, left column, lines 34 to 37, FIG. 2 (A)) JP-A-56-42733 (from page 9, upper right column 9th line to page 3, lower right column, third page, FIG. 3)

しかしながら、このような近年のガス封入方法でシリンダ内にガスを封入する場合には、従来のシール部材では、以下のような不具合を招来する可能性があると指摘される恐れがある。   However, when gas is sealed in the cylinder by such a recent gas sealing method, it may be pointed out that the conventional sealing member may cause the following problems.

すなわち、従来のシール部材では、ピストンロッドとシリンダとの間にシール部材を挿入するときに、シール部材がロッドガイドに対して傾いてしまう場合がある。すると、ロッドガイドとシール部材との間に隙間ができてしまい、ガスを封入するときに、シール部材の内周側リップのみにガス圧力を負荷することができずシール部材の底面にもガス圧力が負荷されてしまう。   That is, in the conventional seal member, when the seal member is inserted between the piston rod and the cylinder, the seal member may be inclined with respect to the rod guide. Then, a gap is formed between the rod guide and the seal member, and when gas is sealed, the gas pressure cannot be applied only to the inner peripheral lip of the seal member, and the gas pressure is also applied to the bottom surface of the seal member. Will be loaded.

そして、このガス圧力によりシール部材がシリンダ内方に向けて移動してしまい、途中リテーナ等によりシール部材の移動が規制されてもシール部材が全体にわたり軸方向に圧縮されて内周側リップをピストンロッドに強く押圧する事態となって、内周側リップとピストンロッドとの間に隙間が形成されず、ガスをシリンダ内に封入することができなくなってしまう場合がある。   The gas pressure causes the seal member to move toward the inside of the cylinder. Even if the movement of the seal member is regulated by a retainer or the like, the seal member is compressed in the axial direction over the whole, and the inner lip is pistoned. There is a situation in which the rod is strongly pressed, and no gap is formed between the inner peripheral lip and the piston rod, and gas cannot be sealed in the cylinder.

そこで、本発明は、上記不具合を改善するために創案されたものであって、その目的とするところは、確実にガスを封入することができるシール部材およびピストンロッドとシリンダとの間にこのシール部材を設けたガススプリングを提供することである。   Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to provide a seal member capable of reliably enclosing gas and this seal between the piston rod and the cylinder. It is to provide a gas spring provided with a member.

上記した目的を解決するために、本発明の第１の課題解決手段におけるシール部材は、一方部材と他方部材との間に設けたシート部材に着座しながら一方部材と他方部材との間をシールする環状のシール部材において、シール部材の一方部材に当接する当接部とシート部材に対向する端部面との間の面の少なくとも一部に一方部材から遠ざかる傾斜面もしくは彎曲面が形成されるとともに、シール部材のシート部材に対向する端部の一方部材側にシート部材に着座する環状の突起部を設けたことを特徴とする。   In order to solve the above-mentioned object, the sealing member in the first problem solving means of the present invention seals between one member and the other member while sitting on a sheet member provided between the one member and the other member. In the annular sealing member, an inclined surface or a curved surface away from the one member is formed on at least a part of the surface between the contact portion that contacts the one member of the sealing member and the end surface facing the sheet member. In addition, an annular protrusion that is seated on the sheet member is provided on one member side of the end portion of the seal member that faces the sheet member.

また、第２の課題解決手段におけるシール部材は、第１の課題解決手段において、シール部材のシート部材に対向する端部の他方部材側に、シート部材に着座し一方部材側に設けた突起部より軸方向長さが短い環状の突起部を設けたことを特徴とする。   Further, the sealing member in the second problem solving means is the projection provided in the first problem solving means, on the other member side of the end portion of the sealing member facing the sheet member, which is seated on the sheet member and provided on the one member side. An annular protrusion having a shorter axial length is provided.

さらに、第３の課題解決手段におけるシール部材は、一方部材と他方部材との間に設けたシート部材に着座しながら一方部材と他方部材との間をシールする環状のシール部材において、シール部材の一方部材に当接する当接部とシート部材に対向する端部面との間の面の少なくとも一部に一方部材から遠ざかる傾斜面もしくは彎曲面が形成されるとともに、シール部材のシート部材に対向する端部面を他方部材側より一方部材側が突出するように傾斜させたことを特徴とする。   Further, the seal member in the third problem solving means is an annular seal member that seals between the one member and the other member while sitting on a seat member provided between the one member and the other member. At least part of the surface between the abutting portion that abuts against the member and the end surface facing the sheet member is formed with an inclined surface or a curved surface away from the one member, and is opposed to the sheet member of the sealing member. The end surface is inclined so that one member side protrudes from the other member side.

また、第４の課題解決手段におけるシール部材は、第１から第３のいずれかの課題解決手段において、シール部材が上側に開口する凹部を有する環状に形成され、凹部を境として一方部材に当接する一方部材側リップと他方部材に当接する他方部材側リップとを備え、その底部側をシート部材に対向させたことを特徴とする。   Further, the seal member in the fourth problem solving means in any of the first to third problem solving means, the seal member is formed in an annular shape having a concave portion that opens upward, and contacts the one member with the concave portion as a boundary. One member-side lip in contact with the other member-side lip is in contact with the other member, and the bottom side of the lip faces the sheet member.

そして、第５の課題解決手段におけるガススプリングは、シリンダと、シリンダ内に摺動自在に挿入されシリンダ内を上室と下室とに区画するピストンと、ピストンに連結されたピストンロッドと、シリンダ端部に嵌合し軸心部にピストンロッドが挿通されるロッドガイドと、当該ロッドガイドのシリンダ内方側に向く面に着座し、シリンダとピストンロッドとの間をシールするシール部材とを備えたガススプリングにおいて、シール部材がシリンダ内方側に開口する凹部を有する環状に形成され、凹部を境としてピストンロッドに当接する内周側リップとシリンダに当接する外周側リップと、内周側リップのピストンロッドに当接する当接部とロッドガイドに対向する底部面との間の面の少なくとも一部に形成されたピストンロッドから遠ざかる傾斜面もしくは彎曲面と、ロッドガイドに対向する底部の内周側にロッドガイドに着座する環状の突起部と、を備えたことを特徴とする。   The gas spring in the fifth problem solving means includes a cylinder, a piston that is slidably inserted into the cylinder and divides the cylinder into an upper chamber and a lower chamber, a piston rod connected to the piston, and a cylinder A rod guide that is fitted to the end and into which the piston rod is inserted into the shaft center, and a seal member that is seated on a surface of the rod guide facing the inner side of the cylinder and seals between the cylinder and the piston rod. In the gas spring, the seal member is formed in an annular shape having a recess that opens to the inner side of the cylinder, the inner peripheral lip that contacts the piston rod with the recess as a boundary, the outer peripheral lip that contacts the cylinder, and the inner peripheral lip It is far from the piston rod formed on at least a part of the surface between the abutting portion that abuts on the piston rod and the bottom surface facing the rod guide. And Cal inclined plane or curved surface, characterized by comprising an annular protrusion seated on the rod guide on the inner peripheral side of the bottom portion facing the rod guide, a.

さらに、第６の課題解決手段におけるガススプリングは、第５の課題解決手段において、シール部材のロッドガイドに対向する底部の外周側に、ロッドガイドに着座しピストンロッド側に設けた突起部より軸方向長さが短い環状の突起部を設けたことを特徴とする。   Further, in the fifth problem solving means, the gas spring according to the sixth problem solving means is pivoted from a protrusion provided on the piston rod side and seated on the rod guide on the outer peripheral side of the bottom portion of the seal member facing the rod guide. An annular protrusion having a short direction length is provided.

そして、第７の課題解決手段におけるガススプリングは、シリンダと、シリンダ内に摺動自在に挿入されシリンダ内を上室と下室とに区画するピストンと、ピストンに連結されたピストンロッドと、シリンダ端部に嵌合し軸心部にピストンロッドが挿通されるロッドガイドと、当該ロッドガイドのシリンダ内方側に向く面に着座し、シリンダとピストンロッドとの間をシールするシール部材とを備えたガススプリングにおいて、シール部材がシリンダ内方側に開口する凹部を有する環状に形成され、凹部を境としてピストンロッドに当接する内周側リップとシリンダに当接する外周側リップと、内周側リップのピストンロッドに当接する当接部とロッドガイドに対向する底部面との間の面の少なくとも一部に形成されたピストンロッドから遠ざかる傾斜面もしくは彎曲面と、を有してなり、シール部材のロッドガイドに対向する底部面を外周側より内周側が突出するように傾斜させたことを特徴とする。   The gas spring in the seventh problem solving means includes a cylinder, a piston that is slidably inserted into the cylinder and divides the cylinder into an upper chamber and a lower chamber, a piston rod connected to the piston, and a cylinder A rod guide that is fitted to the end and into which the piston rod is inserted into the shaft center, and a seal member that is seated on a surface of the rod guide facing the inner side of the cylinder and seals between the cylinder and the piston rod. In the gas spring, the seal member is formed in an annular shape having a recess that opens to the inner side of the cylinder, the inner peripheral lip that contacts the piston rod with the recess as a boundary, the outer peripheral lip that contacts the cylinder, and the inner peripheral lip It is far from the piston rod formed on at least a part of the surface between the abutting portion that abuts on the piston rod and the bottom surface facing the rod guide. It comprises a mowing inclined plane or curved surface, the inner peripheral side from the outer side bottom surface facing the rod guide of the sealing member is characterized in that is inclined so as to protrude.

各請求項の発明によれば、従来のシール部材のように一方部材と他方部材との間にシール部材を挿入するときに、シール部材がシート部材に対して傾いてしまう場合があっても、シール部材の突起部もしくは一方部材側のシート部材に対向する端部面もしくは底部面は、シート部材に着座しており、シート部材とシール部材との間は、その一方部材でシールされているから、シート部材とシール部材との間に隙間ができず、ガスを封入するときに、シール部材の一方部材側とシート部材との間がシールされていることから、シール部材の傾斜面もしくは彎曲面にガス圧力を負荷することがきる。したがって、シール部材のシート部材に対向する端部面もしくは底部面にもガス圧力が負荷されてしまう事態を招来することがないので、このガス圧力によりシール部材が移動してガスを一方部材と他方部材で作られる空間内に封入することができなくなってしまう事がない。すなわち、このシール部材にあっては、確実にガスを上記空間内に封入することができる。   According to the invention of each claim, even when the seal member may be inclined with respect to the sheet member when the seal member is inserted between the one member and the other member as in the conventional seal member, Since the projecting portion of the seal member or the end surface or the bottom surface facing the sheet member on one member side is seated on the sheet member, the sheet member and the seal member are sealed with the one member. Since there is no gap between the sheet member and the seal member, and when the gas is sealed, the seal member is sealed between the one member side and the sheet member. The gas pressure can be loaded. Therefore, the gas pressure is not applied to the end surface or the bottom surface of the seal member facing the sheet member. Therefore, the gas pressure causes the seal member to move so that the gas is moved from one member to the other. There is no possibility of being unable to enclose in a space made of members. That is, in this seal member, the gas can be reliably sealed in the space.

請求項４の発明によれば、特に、シール部材がＵパッキン形状とされ、もともと傾斜面もしくは彎曲面を備えているので、少々の設計変更のみで確実にガスを封入することができ、シール部材を低コストで製造可能である。   According to the invention of claim 4, in particular, since the seal member has a U-packing shape and originally has an inclined surface or a curved surface, the gas can be reliably sealed with only a few design changes. Can be manufactured at low cost.

また、請求項５から請求項７の発明によれば、ガススプリングを組み立てた後にガスを封入する方法において、従来のシール部材では、ロッドガイドに対しシール部材が傾いて上記方法でガス封入が行えない状態となると不良品となってしまうが、本発明のシール部材およびこのシール部材を適用したガススプリングにあっては、確実にガスを封入できるので不良品の発生を防止できるので、製造歩留まりが向上する。したがって、この点で製造コストが向上するとともに、また、シール部材の底部に突起部等を設けるだけで、確実にガスを封入することができるので、低コストでガス封入を行える。   According to the inventions of claims 5 to 7, in the method of enclosing gas after assembling the gas spring, in the conventional seal member, the seal member is inclined with respect to the rod guide, and gas can be encapsulated by the above method. However, in the seal member of the present invention and the gas spring to which this seal member is applied, it is possible to reliably enclose gas, so that the production of defective products can be prevented. improves. Therefore, the manufacturing cost is improved in this respect, and the gas can be reliably sealed simply by providing a projection or the like at the bottom of the seal member, so that the gas can be sealed at a low cost.

請求項７の発明によれば、特に、シール部材をＵパッキン形状とする場合には、もともと傾斜面もしくは彎曲面を備えているので、少々の設計変更のみで確実にガスを封入することができ、この点でシール部材を備えたガススプリングの製造コストをさらに低減できる。   According to the seventh aspect of the present invention, particularly when the sealing member has a U-packing shape, since it is originally provided with an inclined surface or a curved surface, gas can be reliably sealed with only a few design changes. In this respect, the manufacturing cost of the gas spring provided with the seal member can be further reduced.

本実施の形態の説明上、この発明がガススプリングに具現化された場合として以下詳細にこの発明について説明する。本発明が具現化されたガススプリングＧの基本形態は、図１に示すように、他方部材たる有底筒状のシリンダ１と、シリンダ１内に摺動自在に挿入されたピストン３と、シリンダ１内にピストン３を介して移動自在に挿通される一方部材たるピストンロッド２と、ピストンロッド２を軸支するシート部材たるロッドガイド２４と、ピストンロッド２とシリンダ１との間に挿入されロッドガイド２４に着座するシール部材５とで構成され、シリンダ１内はピストン３によって、上室Ｒ１と下室Ｒ２とに区画され、この上室Ｒ１と下室Ｒ２とを連通するオリフィス３ａがピストン３に設けられている。   In the description of the present embodiment, the present invention will be described in detail as a case where the present invention is embodied in a gas spring. As shown in FIG. 1, the basic form of the gas spring G embodying the present invention includes a bottomed cylindrical cylinder 1 as the other member, a piston 3 slidably inserted into the cylinder 1, and a cylinder. 1 is a piston rod 2 that is movably inserted through a piston 3, a rod guide 24 that is a seat member that pivotally supports the piston rod 2, and a rod that is inserted between the piston rod 2 and the cylinder 1. The cylinder 1 is divided into an upper chamber R1 and a lower chamber R2 by a piston 3, and an orifice 3a that communicates the upper chamber R1 and the lower chamber R2 is formed by a piston 3. Is provided.

他方、シール部材５は、図２に示すように、環状のインサートメタル２０にゴム等の素材を金型内で圧縮して成形された図２中上側すなわちシリンダ内方側に開口する凹部５ａを有する円環状に形成され、凹部５ａを境として環状の内周側リップ５ｂと環状の外周側リップ５ｃと、内周側リップ５ｂのピストンロッドに当接する当接部５ｆよりロッドガイド２４に対向する端部たる底部６との間の面に形成されたピストンロッド２から遠ざかる傾斜面５ｅと、を備えたいわゆるＵパッキン形状に形成され、さらに、底部６すなわちロッドガイド２４に対向する端部の内周側に環状の突起部５ｄが設けられている。   On the other hand, as shown in FIG. 2, the seal member 5 has a recess 5 a that is formed by compressing a material such as rubber in an annular insert metal 20 in a mold, and opens on the upper side in FIG. An annular inner circumferential lip 5b, an annular outer circumferential lip 5c, and a contact portion 5f that abuts against the piston rod of the inner circumferential lip 5b are opposed to the rod guide 24 with the recess 5a as a boundary. And a so-called U-packing shape having an inclined surface 5e which is formed on the surface between the bottom portion 6 which is an end portion and which is distant from the piston rod 2, and further, the inner portion of the end portion facing the bottom portion 6 or the rod guide 24. An annular protrusion 5d is provided on the circumferential side.

そして、シール部材５の内周側リップ５ｂの先端を一方部材たるピストンロッド２に摺接して、さらに、シール部材５の外周側リップ５ｃを他方部材たるシリンダ１に当設させており、これにより、シリンダ１とピストンロッド２との間がシールされている。   The tip of the inner peripheral lip 5b of the seal member 5 is in sliding contact with the piston rod 2 as one member, and the outer peripheral lip 5c of the seal member 5 is placed against the cylinder 1 as the other member. The space between the cylinder 1 and the piston rod 2 is sealed.

また、シール部材５の図１中下方には、シリンダ１の図１中下方の管端部をかしめることによりシリンダ１内周に固定され、ピストンロッド２を軸支する有孔円盤状のロッドガイド２４が設けられており、シール部材５は、このロッドガイド２４の図１中上面に載置されるが、このとき、シール部材５の突起部５ｄは、ロッドガイド２４の図１中上面に着座しており、ロッドガイド２４の上面とシール部材５との間はシールされている。また、このシール部材５にあっては、ロッドガイド２４に対してシール部材５が傾くことがあっても、突起部５ｄがシール部材５の底部６から突出しているので、突起部５ｄがロッドガイド２４から離れることはなく、確実にシール部材５とロッドガイド２４との間がシールされる。   Further, a perforated disk-like rod that is fixed to the inner periphery of the cylinder 1 by caulking the pipe end portion of the cylinder 1 below in FIG. 1 below the seal member 5 in FIG. A guide 24 is provided, and the seal member 5 is placed on the upper surface of the rod guide 24 in FIG. 1. At this time, the protrusion 5 d of the seal member 5 is on the upper surface of the rod guide 24 in FIG. It is seated, and the space between the upper surface of the rod guide 24 and the seal member 5 is sealed. Further, in this seal member 5, even if the seal member 5 is inclined with respect to the rod guide 24, the protrusion 5 d protrudes from the bottom 6 of the seal member 5, so that the protrusion 5 d is the rod guide. The gap between the seal member 5 and the rod guide 24 is surely sealed without leaving the gap.

また、シリンダ１の図１中下方であって、上記シール部材５より図１中上方には、ピストンロッド２が挿通される孔を備えた有孔円盤状のリテーナ８がシリンダ１にロールかしめを施すことにより固定され、このリテーナ８によりピストン３がシール部材５に接触することが防止される。   A perforated disk-shaped retainer 8 having a hole through which the piston rod 2 is inserted is below the cylinder 1 in FIG. 1 and above the seal member 5 in FIG. The retainer 8 prevents the piston 3 from contacting the seal member 5.

さらに、シール部材５とリテーナ８との間には、ピストンロッド２の外周を潤滑する潤滑油１５が充填されている。この潤滑油１５は、ピストンロッド２がシリンダ１に対して移動するときに、その外周に附着するから、ピストンロッド２とシール部材５の内周側リップ５ｂとの間が潤滑されるので、ピストンロッド２の移動を円滑なものとすることができる。   Further, between the seal member 5 and the retainer 8, a lubricating oil 15 that lubricates the outer periphery of the piston rod 2 is filled. Since the lubricating oil 15 is attached to the outer periphery of the piston rod 2 when it moves relative to the cylinder 1, the space between the piston rod 2 and the inner peripheral lip 5b of the seal member 5 is lubricated. The movement of the rod 2 can be made smooth.

そして、上記のシール部材５にて、シリンダ１の図１中下端開口部が封止されるとともに、さらに、シリンダ１内には気体が封入されている。したがって、このガススプリングＧでは、ピストン３の図１中上面と下面との受圧面積差によりピストン３に常に伸張する方向の力が作用するので、ガススプリングＧは空気バネとして機能する。   1 is sealed by the sealing member 5 described above, and gas is sealed in the cylinder 1. Therefore, in this gas spring G, a force in the direction of expansion always acts on the piston 3 due to the pressure receiving area difference between the upper surface and the lower surface of the piston 3 in FIG. 1, and therefore the gas spring G functions as an air spring.

さて、上述のようにガススプリングＧおよびシール部材５は構成されるが、ガススプリングＧのシリンダ１内にガスを封入する方法は、以下のとおりである。まず、ガススプリングＧのシリンダ１にピストン３およびピストンロッド２を挿入し、リテーナ８をシリンダ１の内周にロールかしめを施すことにより固定し、潤滑油１５を充填し、さらに、シール部材５がシリンダ１とピストンロッド２との間に挿入されるとともに、ロッドガイド２４がシリンダ１内周にシリンダ１の図１中管端部をかしめることにより固定される。   Now, the gas spring G and the seal member 5 are configured as described above, and the method of enclosing the gas in the cylinder 1 of the gas spring G is as follows. First, the piston 3 and the piston rod 2 are inserted into the cylinder 1 of the gas spring G, the retainer 8 is fixed by roll caulking on the inner periphery of the cylinder 1, filled with lubricating oil 15, and the sealing member 5 While being inserted between the cylinder 1 and the piston rod 2, the rod guide 24 is fixed to the inner periphery of the cylinder 1 by caulking the tube end portion of the cylinder 1 in FIG.

この状態で、シリンダ１の図１中下端開口部から、ガスを流入させる。すると、シール部材５の傾斜面５ｅにガスの圧力が付加されるので、内周側リップ５ｂが変形し、僅かに当該内周側リップ５ｂとピストンロッド２の外周との間に隙間を生じて、ガスがシリンダ１内に封入される。このとき、従来のシール部材のようにピストンロッド２とシリンダ１との間にシール部材５を挿入するときに、シール部材５がロッドガイド２４に対して傾いてしまう場合があっても、図３に示すように、シール部材５の突起部５ｄは、ロッドガイド２４の図１中上面に着座しており、ロッドガイド２４の上面とシール部材５との間は、その内周側でシールされているから、ロッドガイド２４とシール部材５との間に隙間ができず、ガスを封入するときに、シール部材５の内周側リップ５ｂのみにガス圧力を負荷することがきる。したがって、シール部材５の底部６にもガス圧力が負荷されてしまう事態を招来することがないので、このガス圧力によりシール部材５がシリンダ１内方に向けて移動してガスをシリンダ１内に封入することができなくなってしまう事がない。すなわち、このシール部材５にあっては、確実にガスをシリンダ１内に封入することができる。なお、傾斜面５ｅは、ガス圧力負荷により内周側リップ５ｂを一部でも撓ませてガス封入の目的が果たせればよいので、当接部５ｆから底部６の面との間全体に設けなくともよく、また、傾斜面ではなく、凸状もしくは凹状の彎曲面としてもよい。   In this state, gas is allowed to flow from the lower end opening in FIG. Then, since gas pressure is applied to the inclined surface 5e of the seal member 5, the inner peripheral lip 5b is deformed, and a gap is slightly generated between the inner peripheral lip 5b and the outer periphery of the piston rod 2. , Gas is sealed in the cylinder 1. At this time, even when the seal member 5 is inclined with respect to the rod guide 24 when the seal member 5 is inserted between the piston rod 2 and the cylinder 1 as in the conventional seal member, FIG. 1, the protrusion 5 d of the seal member 5 is seated on the upper surface of the rod guide 24 in FIG. 1, and the space between the upper surface of the rod guide 24 and the seal member 5 is sealed on the inner peripheral side. Therefore, there is no gap between the rod guide 24 and the seal member 5, and when gas is sealed, the gas pressure can be applied only to the inner peripheral lip 5b of the seal member 5. Accordingly, there is no possibility that the gas pressure is also applied to the bottom 6 of the seal member 5. Therefore, the gas pressure causes the seal member 5 to move toward the inside of the cylinder 1 to cause the gas to enter the cylinder 1. There is no possibility of being unable to enclose. That is, in the seal member 5, the gas can be reliably sealed in the cylinder 1. The inclined surface 5e is not provided between the abutment portion 5f and the bottom surface 6 because the inclined portion 5e only needs to bend the inner peripheral lip 5b by a gas pressure load to achieve the purpose of gas filling. Alternatively, it may be a convex or concave corrugated surface instead of an inclined surface.

そして、ガス封入後には、シール部材５がシリンダ１内のガス圧力でロッドガイド２側に押圧されるので、内周側リップ５ｂがピストンロッド２に、外周側リップ５ｃがシリンダ１にそれぞれ押し付けられるので、ピストンロッド２とシリンダ１との間がしっかりシールされるので、ガスがシリンダ１内から漏れることは無い。   After the gas is sealed, the seal member 5 is pressed toward the rod guide 2 by the gas pressure in the cylinder 1, so that the inner peripheral lip 5 b is pressed against the piston rod 2 and the outer peripheral lip 5 c is pressed against the cylinder 1. Therefore, since the space between the piston rod 2 and the cylinder 1 is tightly sealed, gas does not leak from the cylinder 1.

また、ガススプリングを組み立てた後にガスを封入する方法において、従来のシール部材では、ロッドガイドに対しシール部材が傾いて上記方法でガス封入が行えない状態となると不良品となってしまうが、本発明のシール部材およびこのシール部材を適用したガススプリングにあっては、確実にガスを封入できるので不良品の発生を防止できるので、製造歩留まりが向上する。したがって、この点で製造コストが向上するとともに、また、シール部材５に突起部５ｄおよび傾斜面５ｅもしくは彎曲面を設けるだけで、確実にガスを封入することができるので、低コストでガス封入を行える。特に、シール部材５をＵパッキン形状とする場合には、もともと傾斜面もしくは彎曲面を備えているので、少々の設計変更のみで確実にガスを封入することができ、シール部材を低コストで製造可能であり、この点で、このシール部材を備えたガススプリングの製造コストをさらに低減できる。   Further, in the method of sealing gas after assembling the gas spring, the conventional sealing member becomes a defective product when the sealing member is inclined with respect to the rod guide and gas sealing cannot be performed by the above method. In the sealing member of the invention and the gas spring to which the sealing member is applied, since gas can be reliably sealed, the generation of defective products can be prevented, and the manufacturing yield is improved. Accordingly, the manufacturing cost is improved in this respect, and the gas can be reliably sealed simply by providing the projecting portion 5d and the inclined surface 5e or the curved surface on the seal member 5, so that the gas can be sealed at a low cost. Yes. In particular, when the seal member 5 has a U-packing shape, since it is originally provided with an inclined surface or a curved surface, gas can be reliably sealed with only a few design changes, and the seal member can be manufactured at low cost. In this respect, the manufacturing cost of the gas spring provided with the seal member can be further reduced.

なお、上述したところでは、突起部５ｄを横断面矩形に形成されているが、図４に示すように、突起部５ｄの形状を、内周側から外周側にかけて図４中上方に傾斜する形状としたり、図５に示すように、その横断面形状を山型に形成するとしてもよい。ようするに、突起部５ｄの形状は、シール部材とシート部材との間を確実にシールできる形状であればよい。   In addition, in the place mentioned above, although the projection part 5d is formed in the cross-sectional rectangle, as shown in FIG. 4, the shape of the projection part 5d inclines upward in FIG. 4 from an inner peripheral side to an outer peripheral side. Alternatively, as shown in FIG. 5, the cross-sectional shape may be formed in a mountain shape. Thus, the shape of the protrusion 5d may be a shape that can reliably seal between the seal member and the sheet member.

また、図６に示すように、内周側に設けられた突起部５ｄより軸方向長さが短い環状の突起部５ｇをシール部材５の底部６の外周側に設けるとしてもよく、さらに、図７に示すように、環状のインサートメタル２０を完全にゴム等の素材で覆うようにしたり、図８に示すように、シール部材５の底部６内周側に突起部５ｄを設ける換わりにシール部材５の底部６の面をその外周側より内周側が突出するように傾斜させるとしてもよい。さらに、インサートメタル２０を設けないとしてもよい。いずれにせよ、シール部材５とシート部材との間をその内周側でシールすることができるので、上記作用効果を奏することができる。  Further, as shown in FIG. 6, an annular protrusion 5g having an axial length shorter than the protrusion 5d provided on the inner peripheral side may be provided on the outer peripheral side of the bottom 6 of the seal member 5. 7 instead of covering the annular insert metal 20 completely with a material such as rubber or providing a projection 5d on the inner peripheral side of the bottom 6 of the seal member 5 as shown in FIG. 5 may be inclined such that the inner peripheral side protrudes from the outer peripheral side. Furthermore, the insert metal 20 may not be provided. In any case, since the space between the seal member 5 and the sheet member can be sealed on the inner peripheral side, the above-described effects can be achieved.

なお、本実施の形態においては、一方部材をピストンロッドとし、他方部材をシリンダとしているが、本発明の意図するところは、ガスを封入するにあたり、ガス圧力がシール部材のリップのみならず底部６にも負荷されて一方部材と他方部材との間を移動してガス封入が行えなくなるという不具合を改善するところにあるので、たとえば、一方部材を中空な筒体として他方部材を蓋体とするような場合には、ガス封入をシール部材の外周側から行うこととなり、シート部材とシール部材との間のシールはその外周側で行われる必要があるので、突起部をシール部材のシート部材に対向する端部の外周側に設けるとともに傾斜面もしくは彎曲面をシール部材の外周側に設ければよい。すなわち、図２から図９に示したシール部材の底部６側に設けられる突起部の形成位置を内周側と外周側で逆にし、傾斜面をシール部材の外周側に設ければよいこととなる。  In the present embodiment, one member is a piston rod, and the other member is a cylinder. However, the purpose of the present invention is that not only the lip of the seal member but also the bottom 6 In other words, the problem is that the gas cannot be sealed by moving between the one member and the other member due to the load, so that, for example, one member is a hollow cylinder and the other member is a lid. In such a case, gas sealing is performed from the outer peripheral side of the seal member, and the seal between the sheet member and the seal member needs to be performed on the outer peripheral side, so that the protrusion is opposed to the sheet member of the seal member. It is only necessary to provide an inclined surface or a curved surface on the outer peripheral side of the seal member while providing it on the outer peripheral side of the end portion. That is, the formation position of the protrusion provided on the bottom 6 side of the seal member shown in FIGS. 2 to 9 may be reversed on the inner peripheral side and the outer peripheral side, and the inclined surface may be provided on the outer peripheral side of the seal member. Become.

さらに、上述したところでは、シール部材５を、いわゆるＵパッキン形状としているが、その底部６側に突起部５ｄが設けられ、あるいは、その底部６の面を他方部材側より一方部材側が突出するように傾斜させ、さらに、シール部材の一方部材に当接する当接部よりシート部材に対向する底部６の面との間の面の少なくとも一部に一方部材から遠ざかる傾斜面もしくは彎曲面が形成してあれば、シールとしての機能を果たすことができ、かつ、ガス封入に適する限り、その他部分の形状はどのような形状であっても差し支えない。  Further, as described above, the sealing member 5 has a so-called U-packing shape. However, a protruding portion 5d is provided on the bottom 6 side, or one surface of the bottom 6 protrudes from the other member side. In addition, an inclined surface or a curved surface away from the one member is formed on at least a part of the surface between the contact portion that contacts the one member of the seal member and the surface of the bottom portion 6 that faces the sheet member. As long as it can function as a seal and is suitable for gas sealing, the other portions may have any shape.

また、本実施の形態においては、シート部材をロッドガイドとしているが、ロッドガイド以外の部材であってもよく、さらに、このシート部材は、一方部材もしくは他方部材と一体的に形成されてもよい。すなわち、たとえば、筒状の他方部材の内周に環状溝を形成し、シール部材をこの環状溝内に嵌合し、さらに、この他方部材内に一方部材が挿入されるような場面では、シート部材は環状溝ということとなる。  In this embodiment, the sheet member is a rod guide. However, the sheet member may be a member other than the rod guide, and the sheet member may be formed integrally with one member or the other member. . That is, for example, in a situation where an annular groove is formed on the inner periphery of the other cylindrical member, a sealing member is fitted into the annular groove, and one member is inserted into the other member, the seat The member is an annular groove.

以上で、本発明の実施の形態についての説明を終えるが、本発明の範囲は図示されまたは説明された詳細そのものには限定されないことは勿論である。また、本発明はガススプリングに具現化されているが、ガススプリング以外の空圧機器の摺動部に具現化可能であるだけでなく、当然であるが、ガスを封入した圧力容器にこのシール部材が適用可能なことは無論である。  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described. In addition, the present invention is embodied in a gas spring, but not only can it be embodied in a sliding portion of a pneumatic device other than a gas spring, but naturally, the seal is attached to a pressure vessel filled with gas. Of course, the member is applicable.

一実施の形態におけるシール部材が具現化されたガススプリングの縦断面図である。It is a longitudinal cross-sectional view of the gas spring in which the sealing member in one embodiment was embodied. 一実施の形態におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in one embodiment. 一実施の形態におけるシール部材がシート部材に対し傾いた状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state in which the sealing member in one Embodiment inclined with respect to the sheet | seat member. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment. 一実施の形態の変形例におけるシール部材の縦断面図である。It is a longitudinal cross-sectional view of the sealing member in the modification of one Embodiment.

符号の説明Explanation of symbols

１ 他方部材たるシリンダ
２ 一方部材たるピストンロッド
３ ピストン
５ シール部材
５ａ 凹部
５ｂ 内周側リップ
５ｃ 外周側リップ
５ｄ，５ｇ 突起部
５ｅ 傾斜面
５ｆ 当接部
６ シール部材のシート部材に対向する端部たる底部
２４ シート部材たるロッドガイド
Ｇ ガススプリング
Ｒ１ 上室
Ｒ２ 下室

DESCRIPTION OF SYMBOLS 1 Cylinder which is another member 2 Piston rod which is one member 3 Piston 5 Seal member 5a Recessed part 5b Inner peripheral side lip 5c Outer peripheral side lip 5d, 5g Protrusion part 5e Inclined surface 5f Contact part 6 End part which faces the sheet member of a seal member 24 which is a seat member Rod guide G Gas spring R1 Upper chamber R2 Lower chamber

Claims (7)

一方部材と他方部材との間に設けたシート部材に着座しながら一方部材と他方部材との間をシールする環状のシール部材において、シール部材の一方部材に当接する当接部とシート部材に対向する端部面との間の面の少なくとも一部に一方部材から遠ざかる傾斜面もしくは彎曲面が形成されるとともに、シール部材のシート部材に対向する端部の一方部材側にシート部材に着座する環状の突起部を設けたことを特徴とするシール部材。 In an annular seal member that seals between one member and the other member while sitting on a sheet member provided between the one member and the other member, the contact portion that contacts the one member of the seal member is opposed to the sheet member An inclined surface or a curved surface that is away from one member is formed on at least a part of the surface between the end surface and the annular member that is seated on the sheet member on the one member side of the end portion of the seal member that faces the sheet member A sealing member provided with a protruding portion. シール部材のシート部材に対向する端部の他方部材側に、シート部材に着座し一方部材側に設けた突起部より軸方向長さが短い環状の突起部を設けたことを特徴とする請求項１に記載のシール部材。 The annular protrusion having an axial length shorter than that of the protrusion provided on the one member side is provided on the other member side of the end portion of the seal member facing the sheet member. The sealing member according to 1. 一方部材と他方部材との間に設けたシート部材に着座しながら一方部材と他方部材との間をシールする環状のシール部材において、シール部材の一方部材に当接する当接部とシート部材に対向する端部面との間の面の少なくとも一部に一方部材から遠ざかる傾斜面もしくは彎曲面が形成されるとともに、シール部材のシート部材に対向する端部面を他方部材側より一方部材側が突出するように傾斜させたことを特徴とするシール部材。 In an annular seal member that seals between one member and the other member while sitting on a sheet member provided between the one member and the other member, the contact portion that contacts the one member of the seal member is opposed to the sheet member An inclined surface or a curved surface that is away from one member is formed on at least a part of the surface between the end surface and the end surface facing the sheet member of the seal member, and the one member side protrudes from the other member side. A seal member characterized by being inclined as described above. シール部材が上側に開口する凹部を有する環状に形成され、凹部を境として一方部材に当接する一方部材側リップと他方部材に当接する他方部材側リップとを備え、その底部側をシート部材に対向させた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部材。 The seal member is formed in an annular shape having a recess opening upward, and includes a one-member-side lip that contacts one member and the other-member-side lip that contacts the other member with the recess as a boundary, with the bottom side facing the sheet member The seal member according to any one of claims 1 to 3, wherein the seal member is formed. シリンダと、シリンダ内に摺動自在に挿入されシリンダ内を上室と下室とに区画するピストンと、ピストンに連結されたピストンロッドと、シリンダ端部に嵌合し軸心部にピストンロッドが挿通されるロッドガイドと、当該ロッドガイドのシリンダ内方側に向く面に着座し、シリンダとピストンロッドとの間をシールするシール部材とを備えたガススプリングにおいて、シール部材がシリンダ内方側に開口する凹部を有する環状に形成され、凹部を境としてピストンロッドに当接する内周側リップとシリンダに当接する外周側リップと、内周側リップのピストンロッドに当接する当接部とロッドガイドに対向する底部面との間の面の少なくとも一部に形成されたピストンロッドから遠ざかる傾斜面もしくは彎曲面と、ロッドガイドに対向する底部の内周側にロッドガイドに着座する環状の突起部と、を備えたことを特徴とするガススプリング。 A cylinder, a piston that is slidably inserted into the cylinder and divides the inside of the cylinder into an upper chamber and a lower chamber, a piston rod connected to the piston, and a piston rod fitted to the end of the cylinder and fitted to the shaft center In a gas spring comprising a rod guide to be inserted and a seal member that is seated on a surface of the rod guide facing the inner side of the cylinder and seals between the cylinder and the piston rod, the seal member is located on the inner side of the cylinder. It is formed in an annular shape having a recess that opens, and an inner peripheral lip that contacts the piston rod with the recess as a boundary, an outer peripheral lip that contacts the cylinder, a contact portion that contacts the piston rod of the inner peripheral lip, and a rod guide An inclined surface or a curved surface away from the piston rod formed on at least a part of the surface between the opposing bottom surfaces and the rod guide Gas spring, characterized in that the inner peripheral side of the parts comprising an annular protrusion seated on the rod guide, a. シール部材のロッドガイドに対向する底部の外周側に、ロッドガイドに着座しピストンロッド側に設けた突起部より軸方向長さが短い環状の突起部を設けたことを特徴とする請求項５に記載のガススプリング。 6. An annular projecting portion having an axial length shorter than a projecting portion seated on the rod guide and provided on the piston rod side is provided on the outer peripheral side of the bottom portion facing the rod guide of the seal member. The gas spring described. シリンダと、シリンダ内に摺動自在に挿入されシリンダ内を上室と下室とに区画するピストンと、ピストンに連結されたピストンロッドと、シリンダ端部に嵌合し軸心部にピストンロッドが挿通されるロッドガイドと、当該ロッドガイドのシリンダ内方側に向く面に着座し、シリンダとピストンロッドとの間をシールするシール部材とを備えたガススプリングにおいて、シール部材がシリンダ内方側に開口する凹部を有する環状に形成され、凹部を境としてピストンロッドに当接する内周側リップとシリンダに当接する外周側リップと、内周側リップのピストンロッドに当接する当接部とロッドガイドに対向する底部面との間の面の少なくとも一部に形成されたピストンロッドから遠ざかる傾斜面もしくは彎曲面と、を有してなり、シール部材のロッドガイドに対向する底部面を外周側より内周側が突出するように傾斜させたことを特徴とするガススプリング。
A cylinder, a piston that is slidably inserted into the cylinder and divides the inside of the cylinder into an upper chamber and a lower chamber, a piston rod that is connected to the piston, and a piston rod that fits into the cylinder end and is attached to the shaft center. In a gas spring comprising a rod guide to be inserted and a seal member that is seated on a surface of the rod guide facing the inner side of the cylinder and seals between the cylinder and the piston rod, the seal member is located on the inner side of the cylinder. It is formed in an annular shape having a recess that opens, and an inner peripheral lip that contacts the piston rod, an outer peripheral lip that contacts the cylinder, a contact portion that contacts the piston rod of the inner peripheral lip, and a rod guide. An inclined surface or a curved surface away from the piston rod formed on at least a part of the surface between the opposed bottom surfaces, and a seal portion Gas spring inner periphery side bottom surface of the outer peripheral side opposite to the rod guide which is characterized in that is inclined so as to protrude.
JP2003272692A 2003-07-10 2003-07-10 Seal member and gas spring Expired - Fee Related JP4113810B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200479304Y1 (en) * 2015-02-26 2016-01-13 주식회사 씨피에스 A Rubber bands of Pipe Connector for improved ability of watertightness
WO2017217432A1 (en) * 2016-06-15 2017-12-21 オイレス工業株式会社 Damper

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200479304Y1 (en) * 2015-02-26 2016-01-13 주식회사 씨피에스 A Rubber bands of Pipe Connector for improved ability of watertightness
WO2017217432A1 (en) * 2016-06-15 2017-12-21 オイレス工業株式会社 Damper
JP2017223296A (en) * 2016-06-15 2017-12-21 オイレス工業株式会社 damper
US10900536B2 (en) 2016-06-15 2021-01-26 Oiles Corporation Damper
EP3473884B1 (en) * 2016-06-15 2021-06-02 Oiles Corporation Damper

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