JP6873000B2 - Shock absorber and cover member - Google Patents

Shock absorber and cover member Download PDF

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Publication number
JP6873000B2
JP6873000B2 JP2017145617A JP2017145617A JP6873000B2 JP 6873000 B2 JP6873000 B2 JP 6873000B2 JP 2017145617 A JP2017145617 A JP 2017145617A JP 2017145617 A JP2017145617 A JP 2017145617A JP 6873000 B2 JP6873000 B2 JP 6873000B2
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cylinder
closing member
insertion hole
tool insertion
shock absorber
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JP2019027479A (en
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朋彦 飯田
朋彦 飯田
直人 秋葉
直人 秋葉
一樹 高橋
一樹 高橋
博之 太田
博之 太田
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Hitachi Astemo Ltd
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Hitachi Astemo Ltd
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Priority to CN201810802387.0A priority patent/CN109307035B/en
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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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/36—Special sealings, including sealings or guides for piston-rods
    • F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders
    • F16F9/3242—Constructional features of cylinders of cylinder ends, e.g. caps
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/10—Enclosure elements, e.g. for protection
    • F16F2230/105—Flexible, e.g. bellows or bladder
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/30—Sealing arrangements
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2230/00—Purpose; Design features
    • F16F2230/46—Maintenance

Description

本発明は、シリンダの開口端部が閉塞部材によって閉塞される緩衝器および該緩衝器に取り付けられるカバー部材に関する。 The present invention relates to a shock absorber in which the open end of the cylinder is closed by a closing member and a cover member attached to the shock absorber.

特許文献１には、シリンダの開口端部が閉塞部材によって閉塞されるユニフロー型油圧緩衝器が開示されている。そして、オーバーホールを可能にするため、シリンダと閉塞部材とをねじ部によって結合させた緩衝器がある。このような緩衝器では、ねじ部に水が浸入して錆が発生した場合、オーバーホール時にシリンダと閉塞部材とを分離させるのが困難になる。 Patent Document 1 discloses a uniflow type hydraulic shock absorber in which the open end of the cylinder is closed by a closing member. Then, in order to enable overhaul, there is a shock absorber in which the cylinder and the closing member are connected by a screw portion. In such a shock absorber, when water enters the threaded portion and rust is generated, it becomes difficult to separate the cylinder and the closing member at the time of overhaul.

特開２０１４−６２６４３号公報Japanese Unexamined Patent Publication No. 2014-62643

本発明は、シリンダと閉塞部材との間に水が侵入するのを抑止した緩衝器および該緩衝器に取り付けられるカバー部材を提供することを課題とする。 An object of the present invention is to provide a shock absorber that prevents water from entering between a cylinder and a closing member, and a cover member that is attached to the shock absorber.

上記課題を解決するために、本発明は、作動液が封入されるシリンダと、前記シリンダの開口端部を閉塞させる閉塞部材と、前記閉塞部材を貫通して延び、先端が前記シリンダの外部へ延出されるピストンロッドと、を備える緩衝器であって、前記シリンダの前記ピストンロッドが延出される側の端部には、前記閉塞部材を被うカバー部材が設けられ、前記閉塞部材の前記ピストンロッドが延出される側の面には、前記シリンダへの着脱に利用される少なくとも１つの工具挿入穴が設けられ、前記カバー部材は、前記工具挿入穴に嵌合される凸形状の嵌合部を有することを特徴とする。
また、本発明は、作動液が封入されるシリンダと、前記シリンダの開口端部を閉塞させる閉塞部材と、前記閉塞部材を貫通して延び、先端が前記シリンダの外部へ延出されるピストンロッドと、前記閉塞部材の前記ピストンロッドが延出される側の面に、前記シリンダへの着脱に利用される少なくとも１つの工具挿入穴が設けられた緩衝器に取り付けられる前記閉塞部材を被うカバー部材であって、前記カバー部材は、前記工具挿入穴に嵌合される凸形状の嵌合部を有することを特徴とする。 In order to solve the above problems, the present invention has a cylinder in which a working fluid is sealed, a closing member that closes the open end of the cylinder, and a closing member that extends through the closing member and has a tip extending to the outside of the cylinder. A shock absorber comprising an extended piston rod, wherein a cover member covering the closing member is provided at an end of the cylinder on the side where the piston rod is extended, and the piston of the closing member is provided. At least one tool insertion hole used for attaching / detaching to / from the cylinder is provided on the surface on the side where the rod extends, and the cover member is a convex fitting portion to be fitted into the tool insertion hole. It is characterized by having.
Further, the present invention includes a cylinder in which a working fluid is sealed, a closing member that closes an open end of the cylinder, and a piston rod that extends through the closing member and has a tip extending to the outside of the cylinder. A cover member that covers the closing member, which is attached to a shock absorber provided with at least one tool insertion hole used for attaching / detaching to / from the cylinder on the surface of the closing member on the side on which the piston rod extends. The cover member is characterized by having a convex fitting portion that is fitted into the tool insertion hole.

本発明によれば、緩衝器のシリンダと閉塞部材との間に水が侵入するのを抑止することができる。 According to the present invention, it is possible to prevent water from entering between the cylinder of the shock absorber and the closing member.

本実施形態に係る緩衝器の概念図であって、シリンダの軸線を含む平面による緩衝器の断面図である。It is a conceptual diagram of the shock absorber which concerns on this embodiment, and is the cross-sectional view of the shock absorber by the plane including the axis of a cylinder. 図１における要部を拡大して示す図である。It is a figure which shows the main part in FIG. 1 in an enlarged manner. 図２における要部を拡大して示す図である。It is a figure which shows the main part in FIG. 2 in an enlarged manner. 図１におけるＡ−Ａ矢視図である。It is a view of arrow AA in FIG. 他の実施形態の説明図である。It is explanatory drawing of another embodiment.

本発明の一実施形態を添付した図を参照して説明する。
ここでは、鉄道車両の車体と台車との間に略水平に配置される複筒式横置きユニフロー型油圧緩衝器１（以下「緩衝器１」と称する）を例示する。便宜上、図１における左方向（左側）および右方向（右側）を、当該緩衝器１における左方向（左側）および右方向（右側）とする。 This will be described with reference to the figure to which one embodiment of the present invention is attached.
Here, a double-cylinder horizontal uniflow type hydraulic buffer 1 (hereinafter referred to as “buffer 1”) arranged substantially horizontally between the vehicle body and the bogie of a railway vehicle will be illustrated. For convenience, the left direction (left side) and the right direction (right side) in FIG. 1 are referred to as the left direction (left side) and the right direction (right side) in the shock absorber 1.

図１は、本実施形態に係る緩衝器１の概念図であって、シリンダの軸線を含む平面による断面図である。緩衝器１は、内筒２および外筒３（シリンダ）を備え、内筒２と同軸上に外筒３を配置する。内筒２および外筒３の左側の開口端部４，５は、閉塞部材２１によって閉塞される。内筒２および外筒３の右側の開口端部６，７は、閉塞部材８によって閉塞される。そして、内筒２と外筒３との間には、環状のリザーバ９が形成される。閉塞部材８は、内筒２の右側の開口端部６を閉塞させる端板１０と、外筒３の右側の開口端部７を閉塞させる端板１１と、に分割して構成される。端板１１の外周面１１Ｂは、外筒３の開口端部７の内周面７Ａに嵌合される。端板１１には、鉄道車両の車体側に連結させるブラケット１２が設けられる。 FIG. 1 is a conceptual diagram of the shock absorber 1 according to the present embodiment, and is a cross-sectional view taken along a plane including an axis of a cylinder. The shock absorber 1 includes an inner cylinder 2 and an outer cylinder 3 (cylinder), and the outer cylinder 3 is arranged coaxially with the inner cylinder 2. The left opening ends 4 and 5 of the inner cylinder 2 and the outer cylinder 3 are closed by the closing member 21. The opening ends 6 and 7 on the right side of the inner cylinder 2 and the outer cylinder 3 are closed by the closing member 8. Then, an annular reservoir 9 is formed between the inner cylinder 2 and the outer cylinder 3. The closing member 8 is divided into an end plate 10 that closes the opening end 6 on the right side of the inner cylinder 2 and an end plate 11 that closes the opening end 7 on the right side of the outer cylinder 3. The outer peripheral surface 11B of the end plate 11 is fitted to the inner peripheral surface 7A of the open end portion 7 of the outer cylinder 3. The end plate 11 is provided with a bracket 12 that is connected to the vehicle body side of the railway vehicle.

端板１０は、内筒２の開口端部６の内周面６Ａに嵌合される。端板１０の右端外周縁には、内筒２の開口端部６の端面３２が当接されるフランジ部１０Ａが形成される。端板１０のフランジ部１０Ａは、端板１１のブラケット１２側とは反対側の面に形成された凹部１３に嵌合（固定）される。内筒２の内側には、液室を左液室１５Ｌと右液室１５Ｒとに区画するピストン１４が嵌装される。ピストン１４には、ピストンロッド１６の右端が接続される。ピストンロッド１６の左端側は、左液室１５Ｌおよび閉塞部材２１を通過して内筒２および外筒３（シリンダ）の外部へ延出される。ピストンロッド１６の左端には、鉄道車両の台車側に連結させるブラケット１７が設けられる。なお、液室（左液室１５Ｌおよび右液室１５Ｒ）には、作動液が封入される。また、リザーバ９には、作動液およびエアが封入される。 The end plate 10 is fitted to the inner peripheral surface 6A of the open end portion 6 of the inner cylinder 2. A flange portion 10A is formed on the outer peripheral edge of the right end of the end plate 10 with which the end surface 32 of the open end portion 6 of the inner cylinder 2 is in contact. The flange portion 10A of the end plate 10 is fitted (fixed) to the recess 13 formed on the surface of the end plate 11 opposite to the bracket 12 side. Inside the inner cylinder 2, a piston 14 that divides the liquid chamber into a left liquid chamber 15L and a right liquid chamber 15R is fitted. The right end of the piston rod 16 is connected to the piston 14. The left end side of the piston rod 16 passes through the left liquid chamber 15L and the closing member 21 and extends to the outside of the inner cylinder 2 and the outer cylinder 3 (cylinder). At the left end of the piston rod 16, a bracket 17 for connecting to the bogie side of the railway vehicle is provided. The hydraulic fluid is sealed in the liquid chambers (left liquid chamber 15L and right liquid chamber 15R). Further, the reservoir 9 is filled with the hydraulic fluid and air.

ピストン１４には、右液室１５Ｒから左液室１５Ｌへの作動液の流通のみを許容する逆止弁１８が設けられる。閉塞部材８の端板１０には、リザーバ９から右液室１５Ｒへの作動液の流通のみを許容する逆止弁１９が設けられる。後述する閉塞部材２１のガイド部２３には、リザーバ９から左液室１５Ｌへの作動液の流通を阻止し、かつ左液室１５Ｌの液圧が上昇して一定圧に達したときに開弁されるリリーフ弁２０が設けられる。すなわち、リリーフ弁２０の開弁によって、左液室１５Ｌの液圧がリザーバ９へ逃がされる。 The piston 14 is provided with a check valve 18 that allows only the flow of the hydraulic fluid from the right liquid chamber 15R to the left liquid chamber 15L. The end plate 10 of the closing member 8 is provided with a check valve 19 that allows only the flow of the hydraulic fluid from the reservoir 9 to the right liquid chamber 15R. The guide portion 23 of the closing member 21, which will be described later, blocks the flow of the hydraulic fluid from the reservoir 9 to the left liquid chamber 15L, and opens the valve when the hydraulic pressure in the left liquid chamber 15L rises and reaches a constant pressure. A relief valve 20 is provided. That is, by opening the relief valve 20, the hydraulic pressure of the left liquid chamber 15L is released to the reservoir 9.

そして、ピストンロッド１６の伸び行程時には、左液室１５Ｌの作動液が、閉塞部材２１（ガイド部２３）のリリーフ弁２０を通過してリザーバ９へ流通する。このとき、伸び側の減衰力が発生する。ピストンロッド１６が左液室１５Ｌから退出した体積分の作動液は、リザーバ９から閉塞部材８（端板１０）の逆止弁１９を通過して右液室１５Ｒへ流入する。他方、ピストンロッド１６の縮み行程時には、右液室１５Ｒの作動液が、ピストン１４の逆止弁１８を通過して左液室１５Ｌへ流通する。ピストンロッド１６が左液室１５Ｌに進入した体積分の作動液は、閉塞部材２１（ガイド部２３）のリリーフ弁２０を通過してリザーバ９へ流通する。このとき、縮み側の減衰力が発生する。 Then, during the extension stroke of the piston rod 16, the hydraulic fluid in the left liquid chamber 15L passes through the relief valve 20 of the closing member 21 (guide portion 23) and flows to the reservoir 9. At this time, a damping force on the extension side is generated. The volume of the hydraulic fluid that the piston rod 16 exits from the left liquid chamber 15L flows from the reservoir 9 through the check valve 19 of the closing member 8 (end plate 10) into the right liquid chamber 15R. On the other hand, during the contraction stroke of the piston rod 16, the hydraulic fluid in the right liquid chamber 15R passes through the check valve 18 of the piston 14 and flows to the left liquid chamber 15L. The volume of the hydraulic fluid in which the piston rod 16 has entered the left liquid chamber 15L passes through the relief valve 20 of the closing member 21 (guide portion 23) and flows to the reservoir 9. At this time, a damping force on the contraction side is generated.

図２に示されるように、閉塞部材２１は、ピストンロッド１６を支持する略円筒形のガイド部２３（本体部）と、ガイド部２３を固定させるリング形のスクリュ部４１（固定部）と、により構成される。ガイド部２３は、大外径部２４と小外径部２５とを有する。大外径部２４の外周面２４Ｂは、外筒３の内周面３Ａに嵌合される。小外径部２５は、大外径部２４に対して同軸に配置され、大外径部２４の左端面２６からシリンダの軸方向に沿って左方向へ延びる。ガイド部２３は、ピストンロッド１６の外周面１６Ｂに摺動可能に当接される軸孔２７を有する。 As shown in FIG. 2, the closing member 21 includes a substantially cylindrical guide portion 23 (main body portion) that supports the piston rod 16 and a ring-shaped screw portion 41 (fixed portion) that fixes the guide portion 23. Consists of. The guide portion 23 has a large outer diameter portion 24 and a small outer diameter portion 25. The outer peripheral surface 24B of the large outer diameter portion 24 is fitted to the inner peripheral surface 3A of the outer cylinder 3. The small outer diameter portion 25 is arranged coaxially with the large outer diameter portion 24, and extends from the left end surface 26 of the large outer diameter portion 24 to the left along the axial direction of the cylinder. The guide portion 23 has a shaft hole 27 that is slidably contacted with the outer peripheral surface 16B of the piston rod 16.

ガイド部２３の、大外径部２４の内側で、かつ軸孔２７の右側には、第２環状凹部２９および第３環状凹部３０が形成される。第１環状凹部２９は、内筒２の開口端部４の内径よりも小さい内径の内周面２９Ａと、軸孔２７の右端が開口する環状の底面２９Ｂと、を有する。第２環状凹部３０は、内筒２の開口端部４の外周面４Ｂが嵌合される内周面３０Ａと、開口端部４の端面３１が当接される（突き当てられる）底面３０Ｂと、を有する。なお、第１環状凹部２９の内周面２９Ａには、リリーフ弁２０に連通する通路が開口される。また、第２環状凹部３０は、底面３０Ｂとは反対側の端がガイド部２３の右端面３３に開口する。 A second annular recess 29 and a third annular recess 30 are formed inside the large outer diameter portion 24 of the guide portion 23 and on the right side of the shaft hole 27. The first annular recess 29 has an inner peripheral surface 29A having an inner diameter smaller than the inner diameter of the open end 4 of the inner cylinder 2 and an annular bottom surface 29B in which the right end of the shaft hole 27 opens. The second annular recess 30 includes an inner peripheral surface 30A into which the outer peripheral surface 4B of the open end 4 of the inner cylinder 2 is fitted, and a bottom surface 30B to which the end surface 31 of the open end 4 is abutted (butted). Has. A passage communicating with the relief valve 20 is opened on the inner peripheral surface 29A of the first annular recess 29. Further, the end of the second annular recess 30 opposite to the bottom surface 30B opens to the right end surface 33 of the guide portion 23.

図２、図３を参照すると、ガイド部２３の、小外径部２５の内側で、かつ軸孔２７の左側には、オイルシール３４（シール部材）が収容される環状のオイルシール収容部３５が形成される。小外径部２５の内側には、オイルシール３４を保持するためのオイルシール保持具３６（シール部材）が装着される環状の溝３７が形成される。小外径部２５の先端部３８の開口３９は、オイルシール収容部３５の内径よりも大きく、かつ溝３７の直径よりも小さい内径を有するとともに、シリンダの軸方向（図２、図３における左右方向）の長さが、オイルシール保持具３６（穴用Ｃ形止め輪）の板厚程度に設定される。換言すると、溝３７は、先端部３８の開口３９とオイルシール収容部３５との間に形成される。 With reference to FIGS. 2 and 3, the annular oil seal accommodating portion 35 in which the oil seal 34 (seal member) is accommodated is inside the small outer diameter portion 25 of the guide portion 23 and on the left side of the shaft hole 27. Is formed. An annular groove 37 on which the oil seal holder 36 (seal member) for holding the oil seal 34 is mounted is formed inside the small outer diameter portion 25. The opening 39 of the tip 38 of the small outer diameter portion 25 has an inner diameter larger than the inner diameter of the oil seal accommodating portion 35 and smaller than the diameter of the groove 37, and has an inner diameter in the axial direction of the cylinder (left and right in FIGS. 2 and 3). The length (direction) is set to about the plate thickness of the oil seal holder 36 (C-shaped retaining ring for holes). In other words, the groove 37 is formed between the opening 39 of the tip portion 38 and the oil seal accommodating portion 35.

スクリュ部４１は、シリンダの軸線を含む平面による断面が略長方形に形成される。スクリュ部４１は、ガイド部２３の小外径部２５の外周面２５Ｂに摺動可能に嵌合される内周面４１Ａと、ガイド部２３の大外径部２４の左端面２６に当接される右端面４３と、を有する。スクリュ部４１の外周面４１Ｂの右端側には、外筒３の開口端部５の内周面５Ａに摺動可能に嵌合される嵌合面４４が形成される。スクリュ部４１の外周面４１Ｂの右端側には、呼び径が嵌合面４４の外径よりも大きいおねじ部４５が形成される。おねじ部４５は、外筒３の開口端部５の内周面５Ａに形成されためねじ部４６に螺合させる。 The screw portion 41 has a substantially rectangular cross section formed by a plane including the axis of the cylinder. The screw portion 41 is in contact with the inner peripheral surface 41A slidably fitted to the outer peripheral surface 25B of the small outer diameter portion 25 of the guide portion 23 and the left end surface 26 of the large outer diameter portion 24 of the guide portion 23. It has a right end surface 43 and a screw. On the right end side of the outer peripheral surface 41B of the screw portion 41, a fitting surface 44 that is slidably fitted to the inner peripheral surface 5A of the open end portion 5 of the outer cylinder 3 is formed. On the right end side of the outer peripheral surface 41B of the screw portion 41, a male screw portion 45 having a nominal diameter larger than the outer diameter of the fitting surface 44 is formed. Since the male threaded portion 45 is formed on the inner peripheral surface 5A of the open end portion 5 of the outer cylinder 3, it is screwed into the threaded portion 46.

スクリュ部４１の左端面４２には、閉塞部材２１の着脱時に工具（治具）が差し込まれる複数個（本実施形態では「２個」）の工具挿入穴４７が設けられる。スクリュ部４１は、例えば、金属からなる部材であり、工具挿入穴４７は、ドリルによって機械加工されるが、リーマ等による仕上げ加工が行われない。これにより、工具挿入穴４７の表面は、仕上げ加工（除去加工）を行った場合と比較すると粗くなっている。ここで、本発明の除去加工とは、ドリルによって機械加工された穴の表面を更に加工して、表面粗さを整えることやバリ取り等をすることである。そして、外筒３の開口端部５のめねじ部４６にスクリュ部４１のおねじ部４５を螺合させ、工具（図示省略）によってスクリュ部４１を締め付ける。 The left end surface 42 of the screw portion 41 is provided with a plurality of tool insertion holes 47 (“2” in this embodiment) into which tools (jigs) are inserted when the closing member 21 is attached / detached. The screw portion 41 is, for example, a member made of metal, and the tool insertion hole 47 is machined by a drill, but is not finished by a reamer or the like. As a result, the surface of the tool insertion hole 47 is rougher than when the finishing process (removal process) is performed. Here, the removal process of the present invention is to further process the surface of a hole machined by a drill to adjust the surface roughness, deburr, and the like. Then, the screw portion 45 of the screw portion 41 is screwed into the female screw portion 46 of the open end portion 5 of the outer cylinder 3, and the screw portion 41 is tightened with a tool (not shown).

図２、図３に示されるスクリュ部４１が締め付けられた状態（製品状態）では、閉塞部材８と閉塞部材２１との間の内筒２には、軸力が発生する。この状態では、ガイド部２３の小外径部２５の先端部３８が、同一平面上に位置するスクリュ部４１の左端面４２および外筒３の開口端部５の左端面４８に対して左方向へ突出される。また、外筒３とガイド部２３とスクリュ部４１とによって囲まれた環状空間４９に収容されたシール部材５０（Ｏリング）が加圧され、外筒３とガイド部２３とスクリュ部４１との間が液密にシールされる。 In the state where the screw portion 41 shown in FIGS. 2 and 3 is tightened (product state), an axial force is generated in the inner cylinder 2 between the closing member 8 and the closing member 21. In this state, the tip 38 of the small outer diameter portion 25 of the guide portion 23 is in the left direction with respect to the left end surface 42 of the screw portion 41 located on the same plane and the left end surface 48 of the open end portion 5 of the outer cylinder 3. Protruded to. Further, the seal member 50 (O-ring) housed in the annular space 49 surrounded by the outer cylinder 3, the guide portion 23, and the screw portion 41 is pressurized, and the outer cylinder 3, the guide portion 23, and the screw portion 41 are brought into contact with each other. The space is hermetically sealed.

次に、閉塞部材２１を被うカバー部材５１を説明する。カバー部材５１は、プラスチック、エラストマー等を材料とする成形品であり、閉塞部材２１が組み付けられた内筒２および外筒３（シリンダ）の左側の端部、換言すると、ピストンロッド１６が延出される側の端部に設けられる。図２乃至図４を参照すると、カバー部材５１は、内周面５２Ａが外筒３の開口端部５の外周面５Ｂに密着（当接）される円筒状の外周部５２と、ガイド部２３の小外径部２５の先端部３８を被う環状の内周部５３と、を有する。内周部５３は、シリンダの軸線を含む平面による断面がチャンネル形（溝形）に形成される３つの側壁５４，５５，５６によって構成される。 Next, the cover member 51 that covers the closing member 21 will be described. The cover member 51 is a molded product made of plastic, elastomer, or the like, and the left end of the inner cylinder 2 and the outer cylinder 3 (cylinder) to which the closing member 21 is assembled, in other words, the piston rod 16 extends. It is provided at the end on the side of the cylinder. Referring to FIGS. 2 to 4, the cover member 51 has a cylindrical outer peripheral portion 52 in which the inner peripheral surface 52A is in close contact (contact) with the outer peripheral surface 5B of the open end portion 5 of the outer cylinder 3, and a guide portion 23. It has an annular inner peripheral portion 53 that covers the tip portion 38 of the small outer diameter portion 25 of the above. The inner peripheral portion 53 is composed of three side walls 54, 55, 56 having a channel-shaped (groove-shaped) cross section formed by a plane including the axis of the cylinder.

側壁５４は、軸直角平面に対して平行に配置され、内側面５４Ａが、ガイド部２３の小外径部２５の先端部３８の端面５７に密着（当接）される。側壁５５は、側壁５４の外周縁部から右方向（ピストンロッド１６の延出方向に沿う方向）へ延び、内周面５５Ａが、ガイド部２３の小外径部２５の先端部３８の外周面３８Ｂに密着（当接）される。側壁５６（延長部）は、側壁５４の内周縁部から右方向（ピストンロッド１６の延出方向に沿う方向）へ延び、内周面５６Ａが、ガイド部２３の小外径部２５の先端部３８の内周面３８Ａ（開口３９）に密着（当接）される。側壁５６は、オイルシール保持具３６（シール部材）まで延長され、右端面５６Ｂが、オイルシール保持具３６の左端面３６Ａ（オイルシール３４に当接される側の面とは反対側の面）に当接される。 The side wall 54 is arranged parallel to the plane perpendicular to the axis, and the inner side surface 54A is brought into close contact (contact) with the end surface 57 of the tip portion 38 of the small outer diameter portion 25 of the guide portion 23. The side wall 55 extends from the outer peripheral edge of the side wall 54 to the right (direction along the extending direction of the piston rod 16), and the inner peripheral surface 55A is the outer peripheral surface of the tip 38 of the small outer diameter portion 25 of the guide portion 23. It is in close contact (contact) with 38B. The side wall 56 (extension portion) extends from the inner peripheral edge portion of the side wall 54 in the right direction (direction along the extending direction of the piston rod 16), and the inner peripheral surface 56A is the tip portion of the small outer diameter portion 25 of the guide portion 23. It is in close contact (contact) with the inner peripheral surface 38A (opening 39) of 38. The side wall 56 is extended to the oil seal holder 36 (seal member), and the right end surface 56B is the left end surface 36A of the oil seal holder 36 (the surface opposite to the surface abutting the oil seal 34). Is in contact with.

カバー部材５１は、内周部５３の側壁５５の右周縁部と外周部５２の左周縁部との間を延びる円板部５８を有する。円板部５８は、右側面５８Ａが、スクリュ部４１の左端面４２に当接される。円板部５８の右側面５８Ａの外周縁部は、外筒３の開口端部５の左端面４８に当接され、延いては、外筒３の開口端部５とスクリュ部４１との間のねじ結合部６０の左端を被う。 The cover member 51 has a disc portion 58 extending between the right peripheral portion of the side wall 55 of the inner peripheral portion 53 and the left peripheral portion of the outer peripheral portion 52. The right side surface 58A of the disk portion 58 is in contact with the left end surface 42 of the screw portion 41. The outer peripheral edge of the right side surface 58A of the disk portion 58 is in contact with the left end surface 48 of the open end portion 5 of the outer cylinder 3, and extends between the open end portion 5 of the outer cylinder 3 and the screw portion 41. Covers the left end of the screw joint 60.

カバー部材５１は、円板部５８の右側面５８Ａに設けられ、スクリュ部４１の工具挿入穴４７に嵌合される凸形状の嵌合部６１を有する。嵌合部６１は、略円柱形に形成され、各工具挿入穴４７に対応して（本実施形態では「２つ」）設けられる。なお、嵌合部６１の外径（工具挿入穴４７との嵌め合い）は、工具挿入穴４７に対する組み付け性および組み付け後の抜け難さを考慮して定められる。また、嵌合部６１の数量は、工具挿入穴４７の数量と同一でなくてもよく、少なくとも１つあればよい。 The cover member 51 is provided on the right side surface 58A of the disk portion 58, and has a convex fitting portion 61 that is fitted into the tool insertion hole 47 of the screw portion 41. The fitting portion 61 is formed in a substantially cylindrical shape, and is provided corresponding to each tool insertion hole 47 (“two” in this embodiment). The outer diameter of the fitting portion 61 (fitting with the tool insertion hole 47) is determined in consideration of the ease of assembling to the tool insertion hole 47 and the difficulty of pulling out after assembling. Further, the number of fitting portions 61 does not have to be the same as the number of tool insertion holes 47, and at least one may be used.

次に、カバー部材５１の取り付け手順を説明する。
緩衝器１本体を組み立てる際に、ピストンロッド１６を内筒２に挿入する前に、予め、閉塞部材２１とカバー部材５１とを挿通しておく。このとき、スクリュ部４１の工具挿入穴４７にカバー部材５１の嵌合部６１を対向させるようにして、カバー部材５１の開口５９にピストンロッド１６を挿通させる。閉塞部材２１のスクリュ部４１（固定部）を工具（図示省略）によって締め付ける。そして、スクリュ部４１の工具挿入穴４７とカバー部材５１の嵌合部６１とを位置合わせしながら、カバー部材５１を閉塞部材２１に接近させ、カバー部材５１の外周部５２の内側に、外筒３の開口端部５を嵌入させる（差し込む）。 Next, the procedure for attaching the cover member 51 will be described.
When assembling the shock absorber 1 main body, the closing member 21 and the cover member 51 are inserted in advance before the piston rod 16 is inserted into the inner cylinder 2. At this time, the piston rod 16 is inserted into the opening 59 of the cover member 51 so that the fitting portion 61 of the cover member 51 faces the tool insertion hole 47 of the screw portion 41. The screw portion 41 (fixed portion) of the closing member 21 is tightened with a tool (not shown). Then, while aligning the tool insertion hole 47 of the screw portion 41 and the fitting portion 61 of the cover member 51, the cover member 51 is brought closer to the closing member 21, and the outer cylinder is inside the outer peripheral portion 52 of the cover member 51. The open end portion 5 of 3 is fitted (inserted).

カバー部材５１の外周部５２に外筒３の開口端部５を嵌入させる過程で、カバー部材５１の嵌合部６１の先端（右端）を、スクリュ部４１の工具挿入穴４７の開口（左端）に嵌合させる。この状態で、カバー部材５１の円板部５８を左側面５８Ｂ側から押圧し、カバー部材５１の各嵌合部６１を、スクリュ部４１の対応する各工具挿入穴４７に嵌合させる。本実施形態では、カバー部材５１の各嵌合部６１を、スクリュ部４１の対応する各工具挿入穴４７に押し込むことで嵌合させる。カバー部材５１の嵌合部６１をスクリュ部４１の工具挿入穴４７に押し込む過程で、カバー部材５１の内周部５３を、閉塞部材２１のガイド部２３の小外径部２５の先端部３８に被せ、カバー部材５１の内周部５３の側壁５６（延長部）の先端（右端面５６Ｂ）を、オイルシール保持具３６（シール部材）の左端面３６Ａに当接させる。これにより、外筒３の開口端部５および閉塞部材２１の左側端部、換言すると、シリンダのピストンロッド１６が延出される側の端部が、カバー部材５１によって被われる。 In the process of fitting the opening end portion 5 of the outer cylinder 3 into the outer peripheral portion 52 of the cover member 51, the tip (right end) of the fitting portion 61 of the cover member 51 is inserted into the opening (left end) of the tool insertion hole 47 of the screw portion 41. Fit into. In this state, the disk portion 58 of the cover member 51 is pressed from the left side surface 58B side, and each fitting portion 61 of the cover member 51 is fitted into each corresponding tool insertion hole 47 of the screw portion 41. In the present embodiment, each fitting portion 61 of the cover member 51 is pushed into each corresponding tool insertion hole 47 of the screw portion 41 to be fitted. In the process of pushing the fitting portion 61 of the cover member 51 into the tool insertion hole 47 of the screw portion 41, the inner peripheral portion 53 of the cover member 51 is brought into the tip portion 38 of the small outer diameter portion 25 of the guide portion 23 of the closing member 21. The tip (right end surface 56B) of the side wall 56 (extension portion) of the inner peripheral portion 53 of the cover member 51 is brought into contact with the left end surface 36A of the oil seal holder 36 (seal member). As a result, the open end 5 of the outer cylinder 3 and the left end of the closing member 21, in other words, the end on the side where the piston rod 16 of the cylinder extends, are covered by the cover member 51.

ここで、シリンダ（外筒）と閉塞部材とがねじ部によって結合される緩衝器の場合、ねじ部に水が浸入して錆が発生するおそれがある。ねじ部の錆は、オーバーホール時に、シリンダから閉塞部材を取り外すのに多大な手間と時間とを要する原因となり、作業の能率を著しく低下させる。従来、シリンダの側壁に引っ掛けて固定する簡易なカバーがあったが、緩衝器の収縮によるカバー内側の圧力の急上昇によって、カバーが外れることがあった。 Here, in the case of a shock absorber in which the cylinder (outer cylinder) and the closing member are connected by the threaded portion, water may enter the threaded portion and rust may occur. Rust on the threaded portion causes a great deal of labor and time to remove the closing member from the cylinder at the time of overhaul, and significantly reduces work efficiency. Conventionally, there was a simple cover that was hooked on the side wall of the cylinder to fix it, but the cover sometimes came off due to a sudden rise in pressure inside the cover due to the contraction of the shock absorber.

これに対して、本実施形態では、カバー部材５１の外周部５２を、外筒３の開口端部５に嵌合させるだけでなく、円板部５８の右側面５８Ａの凸状の嵌合部６１を、閉塞部材２１のスクリュ部４１（固定部）の工具挿入穴４７に嵌合させたため、例えば、工具挿入穴４７にカバー部材の嵌合部６１が入り込むことで、カバー部材５１の回転が抑制され、振動でカバー部材５１が回転することで、徐々に外れようとする動きを防止することができる。また、嵌合部６１が工具挿入穴４７に圧入された場合は、工具挿入穴４７内にある空気が、嵌合部６１が入り込むことで嵌合部６１の外に逃げ、カバー部材５１が外れようとしても、工具挿入穴４７内の圧力は下がっているため、大気圧によって押され、カバー部材５１がスクリュ部４１から脱落することを防止することができる。なお、この場合は、嵌合部６１が工具挿入穴４７に圧入だけでなく、遊嵌していてもよい。また、嵌合部６１が工具挿入穴４７に圧入された場合は、外周面１０１と工具挿入穴４７の内周面１０２とが当接し、外周面１０１と内周面１０２との間で摩擦が生じることにより、カバー部材５１がスクリュ部４１から脱落することを防止することができる。したがって、カバー部材５１が閉塞部材２１を被うので、外筒３と閉塞部材２１とのねじ結合部６０への水の侵入を抑止することができる。その結果、外筒３と閉塞部材２１とのねじ結合部６０の錆の発生を防ぐことができ、緩衝器１のメンテナンス性を向上させることができる。 On the other hand, in the present embodiment, the outer peripheral portion 52 of the cover member 51 is not only fitted to the open end portion 5 of the outer cylinder 3, but also the convex fitting portion of the right side surface 58A of the disc portion 58. Since the 61 is fitted into the tool insertion hole 47 of the screw portion 41 (fixing portion) of the closing member 21, for example, when the fitting portion 61 of the cover member enters the tool insertion hole 47, the cover member 51 rotates. By being suppressed and the cover member 51 rotating due to vibration, it is possible to prevent a movement that gradually tries to come off. Further, when the fitting portion 61 is press-fitted into the tool insertion hole 47, the air in the tool insertion hole 47 escapes to the outside of the fitting portion 61 when the fitting portion 61 enters, and the cover member 51 comes off. Even so, since the pressure in the tool insertion hole 47 is lowered, it is possible to prevent the cover member 51 from falling off from the screw portion 41 due to being pushed by the atmospheric pressure. In this case, the fitting portion 61 may not only be press-fitted into the tool insertion hole 47 but also loosely fitted. Further, when the fitting portion 61 is press-fitted into the tool insertion hole 47, the outer peripheral surface 101 and the inner peripheral surface 102 of the tool insertion hole 47 come into contact with each other, and friction is generated between the outer peripheral surface 101 and the inner peripheral surface 102. As a result, it is possible to prevent the cover member 51 from falling off from the screw portion 41. Therefore, since the cover member 51 covers the closing member 21, it is possible to prevent water from entering the screw joint portion 60 between the outer cylinder 3 and the closing member 21. As a result, it is possible to prevent the occurrence of rust on the screw joint portion 60 between the outer cylinder 3 and the closing member 21, and it is possible to improve the maintainability of the shock absorber 1.

以上、本実施形態の詳細について説明したが、本実施形態の作用効果を以下に示す。
本実施形態によれば、作動液が封入されるシリンダ（３）と、シリンダ（３）の開口端部（５）を閉塞させる閉塞部材（２１）と、閉塞部材（２１）を貫通して延び、先端がシリンダ（３）の外部へ延出されるピストンロッド（１６）と、を備える緩衝器（１）であって、シリンダ（３）のピストンロッド（１６）が延出される側の端部（５）には、閉塞部材（２１）を被うカバー部材（５１）が設けられ、閉塞部材（２１）のピストンロッド（１６）が延出される側の面（４２）には、シリンダ（３）への着脱に利用される少なくとも１つの工具挿入穴（４７）が設けられ、カバー部材（５１）は、工具挿入穴（４７）に嵌合される凸形状の嵌合部（６１）を有する。 The details of this embodiment have been described above, but the effects of this embodiment are shown below.
According to the present embodiment, the cylinder (3) in which the hydraulic fluid is sealed, the closing member (21) that closes the open end (5) of the cylinder (3), and the closing member (21) extend through the closing member (21). A shock absorber (1) having a piston rod (16) whose tip extends to the outside of the cylinder (3), and an end portion (1) on the side where the piston rod (16) of the cylinder (3) extends. 5) is provided with a cover member (51) that covers the closing member (21), and a cylinder (3) is provided on the surface (42) of the closing member (21) on the side on which the piston rod (16) extends. At least one tool insertion hole (47) used for attachment / detachment to / from the tool insertion hole (47) is provided, and the cover member (51) has a convex fitting portion (61) to be fitted into the tool insertion hole (47).

よって、本実施形態は、カバー部材の脱落を防止し、シリンダと閉塞部材との間に水が侵入するのを抑止することができる。これにより、シリンダと閉塞部材との間の錆の発生を防ぎ、オーバーホール時に、閉塞部材をシリンダから容易に取り外すことができる。その結果、緩衝器のメンテナンス性を向上させることができる。また、シリンダのピストンロッドが延出される側の面にカバー部材が密着して、シリンダの外気に晒される側の面がカバー部材によって確りと被われるので、オーバーホール時に、コンタミがシリンダ内部へ侵入するリスクを低下させることができる。そして、カバー部材は、既存の緩衝器に追加工することなく適用可能であり、実施が容易で、かつコストを増加させることもない。 Therefore, in the present embodiment, it is possible to prevent the cover member from falling off and prevent water from entering between the cylinder and the closing member. This prevents the occurrence of rust between the cylinder and the closing member, and the closing member can be easily removed from the cylinder at the time of overhaul. As a result, the maintainability of the shock absorber can be improved. Further, since the cover member is in close contact with the surface of the cylinder on which the piston rod is extended and the surface of the cylinder exposed to the outside air is firmly covered by the cover member, contamination penetrates into the cylinder at the time of overhaul. The risk can be reduced. The cover member can be applied to the existing shock absorber without additional machining, is easy to carry out, and does not increase the cost.

また、ダストブーツを装着した緩衝器との比較では、取り付け構造が簡略化され、取り付けに要する工数を削減することができる。さらに、ダストブーツの取り付け代を確保する必要がないので、緩衝器の基本長を短縮することが可能であり、緩衝器を小型化することができる。また、嵌合部を工具挿入穴に嵌合させたので、シリンダの側壁に引っ掛けて取り付けられる従来構造のカバーのように、振動による移動（回転を含む）および抜けの心配がない。 Further, in comparison with the shock absorber equipped with dust boots, the mounting structure is simplified and the man-hours required for mounting can be reduced. Further, since it is not necessary to secure the mounting allowance for the dust boots, the basic length of the shock absorber can be shortened, and the shock absorber can be miniaturized. Further, since the fitting portion is fitted into the tool insertion hole, there is no concern about movement (including rotation) and disconnection due to vibration unlike the cover of the conventional structure which is attached by hooking on the side wall of the cylinder.

また、本実施形態によれば、カバー部材（５１）の径方向内側には、ピストンロッド（１６）の延出方向へ延長された延長部（５６）が形成され、延長部（５６）の端部は、ピストンロッド（１６）の外周面（１６Ｂ）に摺接させたシール部材（３６）に当接されるので、カバー部材とシール部材との間から、カバー部材と閉塞部材との間への、水の侵入を抑止することができる。 Further, according to the present embodiment, an extension portion (56) extended in the extension direction of the piston rod (16) is formed inside the cover member (51) in the radial direction, and the end of the extension portion (56) is formed. Since the portion is in contact with the seal member (36) slidably contacted with the outer peripheral surface (16B) of the piston rod (16), the portion is brought from between the cover member and the seal member to between the cover member and the closing member. However, the intrusion of water can be suppressed.

また、本実施形態によれば、閉塞部材（２１）は、本体部（２３）と該本体部（２３）をシリンダ（３）の開口端部（５）に固定させる固定部材（４１）とからなり、工具挿入穴（４７）は、固定部材（４１）に形成されるので、固定部材を締め付けるときに工具を挿入するための穴を、カバー部材の嵌合部を嵌合させるための穴として流用することができ、穴の追加工によるコストの増加を防ぐことができる。 Further, according to the present embodiment, the closing member (21) is composed of a main body portion (23) and a fixing member (41) for fixing the main body portion (23) to the open end portion (5) of the cylinder (3). Therefore, since the tool insertion hole (47) is formed in the fixing member (41), the hole for inserting the tool when tightening the fixing member is used as a hole for fitting the fitting portion of the cover member. It can be diverted, and it is possible to prevent an increase in cost due to additional hole machining.

また、本実施形態によれば、工具挿入穴（４７）の表面は、除去加工されない粗い面であるので、閉塞部材（固定部材）の工具挿入穴と、該工具挿入穴に嵌合されるカバー部材の嵌合部との間の摩擦係数が増大されるので、閉塞部材に対するカバー部材の抜け難さを向上させることができる。これにより、シリンダの側壁の塗装された面に装着された従来のカバーでは、緩衝器の収縮によりカバー内側の圧力が急上昇した場合、カバーが脱落するおそれがあったが、本実施形態のカバー部材では、そのような事態を回避することができる。 Further, according to the present embodiment, since the surface of the tool insertion hole (47) is a rough surface that is not removed, the tool insertion hole of the closing member (fixing member) and the cover fitted in the tool insertion hole. Since the coefficient of friction between the member and the fitting portion is increased, it is possible to improve the difficulty of the cover member coming off with respect to the closing member. As a result, in the conventional cover mounted on the painted surface of the side wall of the cylinder, if the pressure inside the cover suddenly rises due to the contraction of the shock absorber, the cover may fall off. Then, such a situation can be avoided.

また、本実施形態によれば、作動液が封入されるシリンダ（３）と、シリンダ（３）の開口端部（５）を閉塞させる閉塞部材（２１）と、閉塞部材（２１）を貫通して延び、先端がシリンダ（３）の外部へ延出されるピストンロッド（１６）と、閉塞部材（２１）のピストンロッド（１６）が延出される側の面（４２）に、シリンダ（３）への着脱に利用される少なくとも１つの工具挿入穴（４７）が設けられた緩衝器（１）に取り付けられる閉塞部材（２１）を被うカバー部材（５１）であって、カバー部材（５１）は、工具挿入穴（４７）に嵌合される凸形状の嵌合部（６１）を有するので、カバー部材の脱落を防止し、シリンダと閉塞部材との間に水が侵入するのを抑止することができる。 Further, according to the present embodiment, the cylinder (3) in which the hydraulic fluid is sealed, the closing member (21) that closes the open end portion (5) of the cylinder (3), and the closing member (21) are penetrated. To the cylinder (3), the piston rod (16) whose tip extends to the outside of the cylinder (3) and the surface (42) of the closing member (21) on the side where the piston rod (16) extends. The cover member (51) covers the closing member (21) attached to the shock absorber (1) provided with at least one tool insertion hole (47) used for attaching / detaching the cover member (51). Since it has a convex fitting portion (61) that is fitted into the tool insertion hole (47), it is possible to prevent the cover member from falling off and prevent water from entering between the cylinder and the closing member. Can be done.

以上、本発明の一実施形態について説明したが、例えば、次のように構成することができる。
例えば、図５に示されるように、カバー部材５１の嵌合部６１の外周面６２に返し部６３を形成するとともに、閉塞部材２１のスクリュ部４１（固定部）の内周面４１Ａに、返し部６３が引っ掛かる環状の溝６４を形成することで緩衝器１を構成する。図５の例示では、溝６４は、シリンダの軸線を含む平面による断面がチャンネル形（一辺が開口された長方形）に形成される。また、返し部６３は、シリンダの軸線を含む平面による断面が直角三角形に形成され、嵌合部６１が工具挿入穴４７に嵌合された状態において、軸直角平面に対して平行に配置された左側面６３Ａが、溝６４の係止面６４Ａに当接される。 Although one embodiment of the present invention has been described above, it can be configured as follows, for example.
For example, as shown in FIG. 5, the return portion 63 is formed on the outer peripheral surface 62 of the fitting portion 61 of the cover member 51, and the return portion 63 is formed on the inner peripheral surface 41A of the screw portion 41 (fixed portion) of the closing member 21. The shock absorber 1 is formed by forming an annular groove 64 on which the portion 63 is hooked. In the example of FIG. 5, the groove 64 is formed in a channel shape (rectangle with one side open) in a plane cross section including the axis of the cylinder. Further, the return portion 63 is arranged parallel to the axis perpendicular plane in a state where the cross section of the return portion 63 is formed into a right triangle in a plane including the axis of the cylinder and the fitting portion 61 is fitted in the tool insertion hole 47. The left side surface 63A is in contact with the locking surface 64A of the groove 64.

このように、嵌合部６１の返し部６３をスクリュ部４１の工具挿入穴４７の溝６４に係合させる（引っ掛ける）ことにより、嵌合部６１の工具挿入穴４７に対する抜け、延いては、カバー部材５１の閉塞部材２１に対する抜けを、より確実に防止することができる。なお、返し部６３および溝６４は、図５に例示される形状の組み合わせに限定されるものではなく、例えば、返し部６３は、溝６４によって係止される複数個の突起とすることができる。 In this way, by engaging (hooking) the return portion 63 of the fitting portion 61 with the groove 64 of the tool insertion hole 47 of the screw portion 41, the fitting portion 61 can be pulled out from the tool insertion hole 47, and thus can be pulled out. It is possible to more reliably prevent the cover member 51 from coming off from the closing member 21. The return portion 63 and the groove 64 are not limited to the combination of the shapes illustrated in FIG. 5, and for example, the return portion 63 may be a plurality of protrusions locked by the groove 64. ..

１ 緩衝器、２ 内筒（シリンダ）、３ 外筒（シリンダ）、５ 開口端部、１６ ピストンロッド、２１ 閉塞部材、４７ 工具挿入穴、５１ カバー部材、６１ 嵌合部 1 shock absorber, 2 inner cylinder (cylinder), 3 outer cylinder (cylinder), 5 open end, 16 piston rod, 21 closing member, 47 tool insertion hole, 51 cover member, 61 fitting part

Claims (6)

作動液が封入されるシリンダと、前記シリンダの開口端部を閉塞させる閉塞部材と、前記閉塞部材を貫通して延び、先端が前記シリンダの外部へ延出されるピストンロッドと、を備える緩衝器であって、
前記シリンダの前記ピストンロッドが延出される側の端部には、前記閉塞部材を被うカバー部材が設けられ、
前記閉塞部材の前記ピストンロッドが延出される側の面には、前記シリンダへの着脱に利用される少なくとも１つの工具挿入穴が設けられ、
前記カバー部材は、前記工具挿入穴に嵌合される凸形状の嵌合部を有することを特徴とする緩衝器。 A shock absorber comprising a cylinder in which a working fluid is sealed, a closing member that closes an open end of the cylinder, and a piston rod that extends through the closing member and extends the tip to the outside of the cylinder. There,
A cover member that covers the closing member is provided at the end of the cylinder on the side where the piston rod extends.
At least one tool insertion hole used for attaching / detaching to / from the cylinder is provided on the surface of the closing member on the side where the piston rod extends.
The cover member is a shock absorber having a convex fitting portion to be fitted into the tool insertion hole. 前記カバー部材の径方向内側には、前記ピストンロッドの延出方向へ延長された延長部が形成され、
前記延長部の端部は、前記ピストンロッドの外周面に摺接させたシール部材に当接されることを特徴とする請求項１に記載の緩衝器。 An extension portion extending in the extension direction of the piston rod is formed inside the cover member in the radial direction.
The shock absorber according to claim 1, wherein the end portion of the extension portion is brought into contact with a seal member that is slidably contacted with the outer peripheral surface of the piston rod. 前記閉塞部材は、本体部と該本体部を前記シリンダの開口端部に固定させる固定部材とからなり、
前記工具挿入穴は、前記固定部材に形成されることを特徴とする請求項１または２に記載の緩衝器。 The closing member includes a main body and a fixing member for fixing the main body to the open end of the cylinder.
The shock absorber according to claim 1 or 2, wherein the tool insertion hole is formed in the fixing member. 前記工具挿入穴の内周面は、前記工具挿入穴が形成された面であって、該内周面は、除去加工によって表面粗さを整えた面に対して粗い面であることを特徴とする請求項１乃至３のいずれかに記載の緩衝器。 The inner peripheral surface of the tool insertion hole is a surface on which the tool insertion hole is formed, and the inner peripheral surface is a surface that is rougher than a surface whose surface roughness has been adjusted by removal processing. The shock absorber according to any one of claims 1 to 3. 前記嵌合部には、返し部が形成され、
前記工具挿入穴には、前記返し部が引っ掛かる溝が形成されることを特徴とする請求項１乃至４のいずれかに記載の緩衝器。 A return portion is formed in the fitting portion, and a return portion is formed.
The shock absorber according to any one of claims 1 to 4, wherein a groove in which the return portion is hooked is formed in the tool insertion hole. 作動液が封入されるシリンダと、前記シリンダの開口端部を閉塞させる閉塞部材と、前記閉塞部材を貫通して延び、先端が前記シリンダの外部へ延出されるピストンロッドと、前記閉塞部材の前記ピストンロッドが延出される側の面に、前記シリンダへの着脱に利用される少なくとも１つの工具挿入穴が設けられた緩衝器に取り付けられる前記閉塞部材を被うカバー部材であって、
前記カバー部材は、前記工具挿入穴に嵌合される凸形状の嵌合部を有することを特徴とするカバー部材。 A cylinder in which a working fluid is sealed, a closing member that closes an open end of the cylinder, a piston rod that extends through the closing member and whose tip extends to the outside of the cylinder, and the closing member. A cover member that covers the closing member attached to a shock absorber provided with at least one tool insertion hole used for attaching / detaching to / from the cylinder on the surface on the side on which the piston rod extends.
The cover member is a cover member having a convex fitting portion to be fitted into the tool insertion hole.
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