JP3678865B2 - Hydraulic cylinder - Google Patents

Hydraulic cylinder Download PDF

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Publication number
JP3678865B2
JP3678865B2 JP03980797A JP3980797A JP3678865B2 JP 3678865 B2 JP3678865 B2 JP 3678865B2 JP 03980797 A JP03980797 A JP 03980797A JP 3980797 A JP3980797 A JP 3980797A JP 3678865 B2 JP3678865 B2 JP 3678865B2
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Japan
Prior art keywords
piston
rod
partition member
oil chamber
side oil
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JP03980797A
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Japanese (ja)
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JPH10220418A (en
Inventor
広司 寺田
洋 平松
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KYB Corp
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KYB Corp
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Priority to JP03980797A priority Critical patent/JP3678865B2/en
Priority to KR1019980002184A priority patent/KR100277427B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1428—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、油圧シリンダに関し、特に、内部に油路を形成するための長尺パイプを有する、例えば、クレーンや高所作業車等の使用に適する油圧シリンダに関する。
【０００２】
【従来の技術】
トラッククレーンにおけるブームの伸縮用等に利用される長尺の油圧シリンダとしては配管用の二本の長尺パイプをシリンダチューブ内に配設したものが開発されている。
【０００３】
この油圧シリンダは、例えば、図２に示すように、シリンダチューブ２１内にピストン２２を介して中空なピストンロッド２３を移動自在に挿入し、ピストン２２はシリンダチューブ２１内にロッド側油室Ｃと反ロッド側油室Ｄを区画し、ピストンロッド２３の下端部に隔壁部材２４とエンド部材２５を結合し、この隔壁部材２４とエンド部材２５に並列に長尺パイプ２６，２７を挿入し、一方のパイプ２７を圧側油路としてロッド側油室Ｃに連通させ、他方のパイプ２６を伸側油路として反ロッド側油室Ｄに連通させたものである。
【０００４】
更に、この油圧シリンダは隔壁部材２４をピストンロッド２３の下端部に溶接２８で結合し、同じくエンド部材２５を隔壁部材２４に溶接２９で結合し、更に二つの長尺パイプ２６，２７も隔壁部材２４とエンド部材２５にそれぞれ溶接３０，３１，３２，３３で結合させたものである。
【０００５】
この為、上記のような油圧シリンダは部品点数が多く、構造が複雑である。更に、各部材を溶接で結合させているから、溶接部における錆や溶接滓が油中に混入される場合があり、油圧シリンダの作動不良の原因となる不具合がある。
【０００６】
この為、例えば、実開平６−７３４１０号公報の図１に開示されたような油圧シリンダが開発されている。
【０００７】
この油圧シリンダは、中空なピストンロッドに直接ピストンをねじ結合させ、ピストンにロッド側油室と反ロッド側油室に連通する通路を形成すると共に、同じくピストンの上記通路に二つのパイプを二重にしたものを差し込み、中央のパイプを反ロッド側油室に開口させ、外側のパイプをロッド側油室に連通させたものである。
【０００８】
【発明が解決しようとする課題】
上記、公報に開示された油圧シリンダは、各部材がねじ結合されたり、差し込み式で結合されているために構造が簡素化され、又、溶接による錆の発生、溶接滓の発生が防止され、作動不良が生じるような不具合は解消される反面、油路を形成するための二本のパイプが二重構造となっているから十分な油路確保のためには外側のパイプを大径にする必要がある。この為に外側のパイプが大径になった分重量が重くなり、これを搭載した車両の車体重量が大きくなり、クレーン等では吊下げ荷重が小さくなる不具合がある。
【０００９】
そこで、本発明の目的は、構造が簡単であり、溶接が不要であり、全体重量の軽減が図れる油圧シリンダを提供することである。
【００１０】
【課題を解決するための手段】
上記の目的を達成するため、本発明の手段は、 シリンダチューブ内に中空なピストンロッドが中空なピストンを介して移動自在に挿入され、ピストンはシリンダチューブ内にロッド側油室と反ロッド側油室を区画し、ピストンロッドの端部内側に隔壁部材を挿入し、当該隔壁部材には、上記ロッド側油室に開口する第１の通路と反ロッド側油室に開口する第２の通路を形成し、第１，第２の通路には、ロッド側油室と反ロッド側油室に圧油を給排させる第１，第２のパイプをそれぞれ挿入させている油圧シリンダに於て、上記隔壁部材を本体と本体の下端部に形成されて本体の直径より小さい直径のインロー部とで構成し、上記隔壁部材の本体をピストンロッドの内側に挿入すると共に上記インロー部をピストンの内側に挿入し、ピストン上端部をピストンロッド外周にねじ結合させながら上記隔壁部材の本体下端をピストンの内側に形成した段部で支持させ、更に、上記第１，第２のパイプがピストンロッド内に配設したサポータで支持されていることを特徴とするものである。
【００１１】
この場合、上記隔壁部材の本体外周とピストンロッド内周との間に第１のシール部材を介在させ、又、上記インロー部の外周とピストン内周との間に第２のシール部材を介在させているのが好ましい。
【００１２】
同じく、隔壁部材の本体とピストンロッドの下端部との間に隔壁部材の回り止め用ピンが嵌合されているのが好ましい。
【００１３】
同じく、第１の通路が縦孔と横孔とで構成され、第２の通路がストレートな縦孔で形成され、第１の通路における縦孔内にシール部材を介して第１のパイプの下部を挿入し、第２の通路内に第２のパイプの下部をシール部材を介して挿入させているのが好ましい。
【００１４】
同じく、サポータが水平な板体で形成され、この板体に形成した二つの孔にそれぞれ第１，第２のパイプを貫通させているのが好ましい。
【００１５】
【発明の実施の形態】
以下、本発明の実施の形態を図にもとづいて説明する。
【００１６】
本発明の油圧シリンダは図１に示すように、シリンダチューブ１内に中空なピストンロッド２が中空なピストン３を介して移動自在に挿入され、ピストン３はシリンダチューブ１内にロッド側油室Ａと反ロッド側油室Ｂを区画し、ピストンロッド２の下端部内側に隔壁部材４の本体４ａを挿入し、当該隔壁部材４の本体４ａには、上記ロッド側油室Ａに開口する第１の通路５と反ロッド側油室Ｂに開口する第２の通路６を形成し、第１，第２の通路５，６には、ロッド側油室Ａと反ロッド側油室Ｂに圧油を給排させる第１，第２のパイプＰ１，Ｐ２をそれぞれ挿入させているものである。
【００１７】
更に詳しく述べる。
【００１８】
中空なピストン３はその上端部が中空なピストンロッド２の下部外周にねじ８を介してねじ結合され、必要に応じて両者はピン７で結合される。
【００１９】
ピストン３は外周の軸受ａ，ｂとシール部材ｃを介してシリンダチューブ１の内周に摺接する。ピストン３の下部外周には多角形状、例えば、六角形状の面取り９が加工され、この面取り９に工具、例えば、六角レンチを挿入してピストンロッド２に対する着脱操作を行なうようになっている。
【００２０】
ピストンロッド２の下端部内周には隔壁部材４の本体４ａ上部が挿入され、両者の間に第１のシール部材としてのＯリング１０が介在されると共に本体４ａ中間の段部４ｃがピストンロッド２の下端に当接している。隔壁部材４の本体４ａとピストンロッド２の下端部との間には横方向からピン１２を挿入して本体４ａの回り止めを行なうようにしてもよい。
【００２１】
隔壁部材４の本体４ａより下方には、ピストンロッド２の下端より下方に突出するインロー部４ｂが形成され、このインロー部４ｂの外周にピストン３の内周が嵌合している。インロー部４ｂの外周とピストン３の内周との間には第２のシール部材としてのＯリング１１が介在されている。
【００２２】
ピストン３の内周中間には水平な段部３ａが形成され、この段部３ａの上端が隔壁部材４の下面、即ち、本体４ａの下端を支持している。即ち、隔壁部材４はピストンロッド２とピストン３とで上下から挾持されている。
【００２３】
第１のＯリング１０の直径は第２のＯリング１１の直径より大きく形成されており、この結果ピストン３をピストンロッド２の外周に螺合するよう回動しても第１のＯリング１０のフリクションが第２のＯリング１１のそれより大きいため、仮りにピン１２が無くても隔壁部材４は回動しない。
【００２４】
ピストン３にはインロー部４ｂの下端に対応する段部を形成し、この段部でインロー部４ｂの下端を支持してもよい。
【００２５】
隔壁部材４の下面、例えば、インロー部４ｂの下面に取付用及び分解用の抜きタップ穴１３を形成し、この抜きタップ穴１３に工具を差し込んでピストンロッド２に対する着脱操作を容易に行なうようにしたものである。
【００２６】
隔壁部材４の本体４ａには第１の通路５たる縦孔５ａと横孔５ｂを形成し、又ピストン３には横孔５ｂに対向する通路３ｂが形成され、これらの通路５，通路３ｂはロッド側油室Ａに開口している。
【００２７】
縦孔５ａ内には長尺な第１のパイプＰ１の下部がＯリングからなるシールを介して挿入され、この第１のパイプＰ１を介してロッド側油室Ａに圧油が給排され、圧油が導入された時ピストンロッド２とピストン３が下方に移動して圧縮作動する。
【００２８】
同じく隔壁部材４の本体４ａとインロー部４ｂには反ロッド側油室Ｂに開口する第１の通路５たる縦孔５ａが形成され、この縦孔５ａ内に第２のパイプＰ２の下部がＯリングからなるシールを介して挿入され、この第２のパイプＰ２を介して反ロッド側油室Ｂに圧油が給排され、圧油が供給された時ピストンロッド２とピストン３が上方に移動して伸長作動する。
【００２９】
ピストンロッド２内にはサポータ１４が配設され、このサポータ１４で二つの第１，第２のパイプＰ１，Ｐ２を支えている。
【００３０】
例えば、二つのパイプＰ１，Ｐ２は板体からなるサポータ１４の二つの孔内を貫通して支持され、これにより二つのパイプＰ１，Ｐ２の座屈が防止されると共に隔壁部材４との結合作業時における位置合せを確実に出来、各パイプＰ１，Ｐ２をそれぞれ第１，第２の通路５，６に必ず挿入できるようにしている。各パイプＰ１，Ｐ２はサポータ１４に挿入した状態でピストンロッド２の上方から挿入される。この際、隔壁部材４を挿入固着した後で各パイプＰ１，Ｐ２を取り付けてもよく、又は各パイプＰ１，Ｐ２を挿入している状態で隔壁部材４を各パイプＰ１，Ｐ２に位置合せしながら挿入してもよい。
【００３１】
ピストンロッド２の上方外周にはスペーサ１５が挿入され、又、スペーサ１５の上方にシール１７を介してキャップ１６が取り付けられ、キャップ１６とスペーサ１５の外側にはシリンダチューブ１の上部外周にねじ結合されたフランジ１８が設けられている。
【００３２】
【発明の効果】
本発明によれば、次の効果がある。
【００３３】
各請求項の発明によれば、ピストンがピストンロッドにねじ結合され、隔部部材の本体がピストンロッドの内側に挿入されると共に当該本体の下端がピストンの内側に形成した段部で支持され、更に第１，第２のパイプが隔壁部材に形成した第１，第２の通路内に挿入されているだけであるから、各部材の結合手段は溶接を使用しておらず、その結果、溶接の錆、溶接の滓が油中に混入せず、作動不良を生じさせない。
【００３４】
▲２▼同じく各請求項の発明によれば、第１，第２の独立した通路にそれぞれ第１，第２のパイプを独立して挿入しているから、各パイプの油路が大きくとれ、これにより各パイプをそれぞれ小径にできるから重量が軽減される。
【００３５】
▲３▼同じく請求項の発明によれば、ピストンロッドに隔壁部材を取り付け、この隔壁部材に二本のパイプを挿入しているだけであるから、隔壁部材とエンド部材を備えているものに比べて部品点数が少なく、構造が簡単となり、加工性，組付性、経済性の向上が図れる。
【００３６】
▲４▼同じく各請求項の発明によれば、二つのパイプがサポータで支えられているから、第１，第２の通路に対する位置合せが出来、二つのパイプと隔壁部材との結合が容易となる。又、サポータで各パイプが支えられていることにより各パイプの座屈を防止できる。
【００３７】
▲５▼請求項２の発明によれば、隔壁部材にインロー部を設けているから、これをピストン内周に嵌合でき、隔壁部材が確実に保持される。又、隔壁部材の本体外周のＯリングはインロー部外周のＯリングより直径が大きいから、フリクション、締代が第２のＯリングのそれより大きくなり、ピストンを回動しながらピストンロッドに結合する際に隔壁部材が一緒に回動するのが防止できる。
【００３８】
▲６▼請求項３の発明によれば、ピンが存在することにより隔壁部材が軸方向，回転方向への移動が阻止される。
【図面の簡単な説明】
【図１】本発明の一実施の形態に係る油圧シリンダの一部切欠き縦断正面図である。
【図２】従来の油圧シリンダの一部切欠き縦断正面図である。
【符号の説明】
１ シリンタチューブ
２ ピストンロッド
３ ピストン
３ａ 段部
４ 隔壁部材
４ａ 本体
４ｂ インロー部
５ 第１の通路
５ａ 縦孔
５ｂ 横孔
６ 第２の通路
９ 面取り
１０ シール部材たる第１のＯリング
１１ シール部材たる第２のＯリング
１２ 回り止め用ピン
１３ 分解用の抜きタップ穴
１４ サポータ
Ａ ロッド側油室
Ｂ 反ロッド側油室
Ｐ１，Ｐ２ パイプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic cylinder, and more particularly to a hydraulic cylinder having a long pipe for forming an oil passage therein and suitable for use in, for example, a crane or an aerial work vehicle.
[0002]
[Prior art]
2. Description of the Related Art As a long hydraulic cylinder used for expanding and contracting a boom in a truck crane, one having two long pipes for piping arranged in a cylinder tube has been developed.
[0003]
In this hydraulic cylinder, for example, as shown in FIG. 2, a hollow piston rod 23 is movably inserted into a cylinder tube 21 via a piston 22, and the piston 22 is connected to the rod side oil chamber C and the cylinder tube 21. The anti-rod side oil chamber D is partitioned, a partition member 24 and an end member 25 are coupled to the lower end of the piston rod 23, and long pipes 26 and 27 are inserted in parallel with the partition member 24 and the end member 25. This pipe 27 is communicated with the rod side oil chamber C as a pressure side oil passage, and the other pipe 26 is communicated with the non-rod side oil chamber D as an extension side oil passage.
[0004]
Further, in this hydraulic cylinder, the partition member 24 is connected to the lower end portion of the piston rod 23 by welding 28, the end member 25 is connected to the partition member 24 by welding 29, and the two long pipes 26 and 27 are also connected to the partition member. 24 and the end member 25 are joined by welding 30, 31, 32, 33, respectively.
[0005]
For this reason, the hydraulic cylinder as described above has a large number of parts and a complicated structure. Furthermore, since each member is joined by welding, rust and welding rods in the welded portion may be mixed in the oil, which causes a malfunction that causes a malfunction of the hydraulic cylinder.
[0006]
For this reason, for example, a hydraulic cylinder as disclosed in FIG. 1 of Japanese Utility Model Laid-Open No. 6-73410 has been developed.
[0007]
In this hydraulic cylinder, a piston is directly screwed to a hollow piston rod to form a passage in the piston that communicates with the rod-side oil chamber and the anti-rod-side oil chamber. In this case, the center pipe is opened in the anti-rod side oil chamber, and the outer pipe is communicated with the rod side oil chamber.
[0008]
[Problems to be solved by the invention]
In the hydraulic cylinder disclosed in the above publication, the structure is simplified because each member is screw-coupled or joined by a plug-in type, and the occurrence of rust due to welding and the occurrence of welding flaws are prevented, While troubles that cause malfunctions are eliminated, the two pipes for forming the oil passage have a double structure, so the outer pipe has a large diameter to secure a sufficient oil passage. There is a need. For this reason, the weight of the outer pipe becomes larger, the weight becomes heavier, the vehicle body weight of the vehicle on which the outer pipe is mounted becomes larger, and there is a problem that the hanging load becomes smaller in a crane or the like.
[0009]
Therefore, an object of the present invention is to provide a hydraulic cylinder that has a simple structure, does not require welding, and can reduce the overall weight.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the means of the present invention is such that a hollow piston rod is movably inserted into the cylinder tube via the hollow piston, and the piston is inserted into the cylinder tube in the rod side oil chamber and the anti-rod side oil. The chamber is partitioned, a partition member is inserted inside the end of the piston rod, and the partition member has a first passage that opens to the rod-side oil chamber and a second passage that opens to the anti-rod-side oil chamber. formed, first, in the second passage, at a first hydraulic cylinder respectively by inserting a second pipe for supplying and discharging pressure oil to the rod side oil chamber and the anti-rod side oil chamber, the The bulkhead member is formed of a main body and an inlay portion having a diameter smaller than the diameter of the main body, and the main body of the bulkhead member is inserted inside the piston rod and the inlay portion is inserted inside the piston. And on the piston A supporter in which the lower end of the main body of the partition wall member is supported by a step formed on the inside of the piston while the end is screwed to the outer periphery of the piston rod, and the first and second pipes are disposed in the piston rod. It is characterized by being supported.
[0011]
In this case, the first seal member is interposed between the body outer periphery and the piston rod circumference of the partition wall member, also interposed a second sealing member between the outer periphery and the piston inner periphery of the socket portion It is preferable.
[0012]
Similarly, it is preferable that a detent pin for the partition wall member is fitted between the main body of the partition wall member and the lower end portion of the piston rod.
[0013]
Similarly, the first passage is constituted by a vertical hole and a horizontal hole, the second passage is formed by a straight vertical hole, and the lower portion of the first pipe is interposed in the vertical hole in the first passage via a seal member. It is preferable that the lower part of the second pipe is inserted into the second passage through the seal member.
[0014]
Similarly, the supporter is preferably formed of a horizontal plate, and the first and second pipes are preferably passed through two holes formed in the plate.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
In the hydraulic cylinder of the present invention, as shown in FIG. 1, a hollow piston rod 2 is movably inserted into a cylinder tube 1 via a hollow piston 3, and the piston 3 is inserted into the cylinder tube 1 in a rod side oil chamber A. And the anti-rod side oil chamber B, the main body 4a of the partition wall member 4 is inserted inside the lower end of the piston rod 2, and the main body 4a of the partition wall member 4 has a first opening that opens into the rod side oil chamber A. And a second passage 6 that opens to the anti-rod side oil chamber B, and the first and second passages 5 and 6 are pressurized oil to the rod-side oil chamber A and the anti-rod side oil chamber B. The first and second pipes P1 and P2 for feeding and discharging are respectively inserted.
[0017]
Further details will be described.
[0018]
The hollow piston 3 is screwed to the lower outer periphery of the hollow piston rod 2 at its upper end via a screw 8, and both are connected by a pin 7 as necessary.
[0019]
The piston 3 is in sliding contact with the inner periphery of the cylinder tube 1 via outer peripheral bearings a and b and a seal member c. A polygonal, for example, hexagonal chamfer 9 is machined on the outer periphery of the lower portion of the piston 3, and a tool, for example, a hexagonal wrench is inserted into the chamfer 9 so that the piston rod 2 can be attached and detached.
[0020]
The upper portion of the main body 4a of the partition wall member 4 is inserted into the inner periphery of the lower end of the piston rod 2, an O-ring 10 serving as a first seal member is interposed therebetween, and the step 4c in the middle of the main body 4a is connected to the piston rod 2. It is in contact with the lower end of. A pin 12 may be inserted from the lateral direction between the main body 4a of the partition member 4 and the lower end portion of the piston rod 2 to prevent the main body 4a from rotating.
[0021]
Below the main body 4a of the partition member 4, an inlay portion 4b that protrudes downward from the lower end of the piston rod 2 is formed, and the inner periphery of the piston 3 is fitted to the outer periphery of the inlay portion 4b. An O-ring 11 as a second seal member is interposed between the outer periphery of the spigot part 4b and the inner periphery of the piston 3.
[0022]
A horizontal step 3a is formed in the middle of the inner periphery of the piston 3, and the upper end of the step 3a supports the lower surface of the partition member 4, that is, the lower end of the main body 4a. That is, the partition member 4 is sandwiched between the piston rod 2 and the piston 3 from above and below.
[0023]
The diameter of the first O-ring 10 is larger than the diameter of the second O-ring 11. As a result, even if the piston 3 is rotated so as to be screwed onto the outer periphery of the piston rod 2, the first O-ring 10 Therefore, even if the pin 12 is not present, the partition member 4 does not rotate.
[0024]
A step portion corresponding to the lower end of the spigot portion 4b may be formed in the piston 3, and the lower end of the spigot portion 4b may be supported by this step portion.
[0025]
An attaching and disassembling punch tap hole 13 is formed on the lower surface of the partition member 4, for example, the lower surface of the spigot portion 4b, and a tool is inserted into the punch tap hole 13 so that the piston rod 2 can be easily attached and detached. It is a thing.
[0026]
A vertical hole 5a and a horizontal hole 5b, which are first passages 5, are formed in the main body 4a of the partition member 4, and a passage 3b is formed in the piston 3 so as to face the lateral hole 5b. It opens to the rod side oil chamber A.
[0027]
A lower portion of the long first pipe P1 is inserted into the vertical hole 5a through a seal made of an O-ring, and pressure oil is supplied to and discharged from the rod-side oil chamber A through the first pipe P1, When the pressure oil is introduced, the piston rod 2 and the piston 3 move downward and perform compression.
[0028]
Similarly, a vertical hole 5a, which is a first passage 5 that opens to the anti-rod side oil chamber B, is formed in the main body 4a and the inlay portion 4b of the partition wall member 4, and the lower portion of the second pipe P2 is O in the vertical hole 5a. Inserted through a ring seal, pressure oil is supplied to and discharged from the anti-rod side oil chamber B through the second pipe P2, and when the pressure oil is supplied, the piston rod 2 and the piston 3 move upward. Then, it is extended.
[0029]
A supporter 14 is disposed in the piston rod 2, and the supporter 14 supports the two first and second pipes P1 and P2.
[0030]
For example, the two pipes P1 and P2 are supported by penetrating through the two holes of the supporter 14 made of a plate, thereby preventing the buckling of the two pipes P1 and P2 and joining the partition member 4 The alignment at the time can be ensured, and the pipes P1, P2 can be surely inserted into the first and second passages 5, 6, respectively. Each pipe P1, P2 is inserted from above the piston rod 2 while being inserted into the supporter. At this time, the pipes P1 and P2 may be attached after the partition member 4 is inserted and fixed, or the partition member 4 is aligned with the pipes P1 and P2 while the pipes P1 and P2 are inserted. It may be inserted.
[0031]
A spacer 15 is inserted into the upper outer periphery of the piston rod 2, and a cap 16 is attached to the upper portion of the spacer 15 via a seal 17. The cap 16 and the spacer 15 are screwed to the upper outer periphery of the cylinder tube 1. A flange 18 is provided.
[0032]
【The invention's effect】
The present invention has the following effects.
[0033]
According to the invention of each claim, the piston is screwed to the piston rod, the main body of the partition member is inserted inside the piston rod, and the lower end of the main body is supported by a step formed inside the piston, Further, since the first and second pipes are only inserted into the first and second passages formed in the partition wall member, the joining means of each member does not use welding, and as a result, welding Rust and welding flaws are not mixed in the oil, causing malfunctions.
[0034]
(2) Similarly, according to the invention of each claim, since the first and second pipes are independently inserted into the first and second independent passages, the oil passages of the respective pipes can be made large, As a result, each pipe can be reduced in diameter so that the weight is reduced.
[0035]
(3) Similarly, according to the claimed invention, the partition member is attached to the piston rod, and two pipes are inserted into the partition member, so that the partition member and the end member are provided. The number of parts is small, the structure is simple, and workability, assembly, and economy are improved.
[0036]
(4) Similarly, according to the invention of each claim, since the two pipes are supported by the supporter, the first and second passages can be aligned, and the two pipes and the partition member can be easily combined. Become. Further, since each pipe is supported by the supporter, buckling of each pipe can be prevented.
[0037]
(5) According to the invention of claim 2, since the inlay portion is provided in the partition member, it can be fitted to the inner periphery of the piston, and the partition member is securely held. Also, since the O-ring on the outer periphery of the bulkhead member has a larger diameter than the O-ring on the outer periphery of the spigot part, the friction and tightening margin are larger than that of the second O-ring, and the piston is connected to the piston rod while rotating the piston In this case, the partition member can be prevented from rotating together.
[0038]
(6) According to the invention of claim 3, the presence of the pin prevents the partition member from moving in the axial direction and the rotational direction.
[Brief description of the drawings]
FIG. 1 is a partially cutaway longitudinal front view of a hydraulic cylinder according to an embodiment of the present invention.
FIG. 2 is a partially cut-away front view of a conventional hydraulic cylinder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder tube 2 Piston rod 3 Piston 3a Step part 4 Partition member 4a Main body 4b Spiral part 5 1st channel | path 5a Vertical hole 5b Horizontal hole 6 2nd channel | path 9 Chamfering 10 1st O-ring 11 which is a sealing member Seal member The second O-ring 12 which is a rotation-preventing pin 13 The tap hole 14 for disassembly Supporter A Rod side oil chamber B Anti-rod side oil chamber P1, P2 Pipe

Claims (5)

シリンダチューブ内に中空なピストンロッドが中空なピストンを介して移動自在に挿入され、ピストンはシリンダチューブ内にロッド側油室と反ロッド側油室を区画し、ピストンロッドの端部内側に隔壁部材を挿入し、当該隔壁部材には、上記ロッド側油室に開口する第１の通路と反ロッド側油室に開口する第２の通路を形成し、第１，第２の通路には、ロッド側油室と反ロッド側油室に圧油を給排させる第１，第２のパイプをそれぞれ挿入させている油圧シリンダに於て、上記隔壁部材を本体と本体の下端部に形成されて本体の直径より小さい直径のインロー部とで構成し、上記隔壁部材の本体をピストンロッドの内側に挿入すると共に上記インロー部をピストンの内側に挿入し、ピストン上端部をピストンロッド外周にねじ結合させながら上記隔壁部材の本体下端をピストンの内側に形成した段部で支持させ、更に、上記第１，第２のパイプがピストンロッド内に配設したサポータで支持されている油圧シリンダ。A hollow piston rod is movably inserted into the cylinder tube through the hollow piston. The piston partitions the rod side oil chamber and the anti-rod side oil chamber in the cylinder tube, and the partition member is located on the inner side of the end of the piston rod. The partition member is formed with a first passage that opens to the rod-side oil chamber and a second passage that opens to the anti-rod-side oil chamber, and the first and second passages include rods. In the hydraulic cylinder into which the first and second pipes for supplying and discharging pressure oil to and from the side oil chamber and the non-rod side oil chamber are inserted, the partition member is formed at the main body and the lower end of the main body. The main body of the partition member is inserted inside the piston rod, the inlay portion is inserted inside the piston, and the upper end of the piston is screwed to the outer periphery of the piston rod. But Is supported by the stepped portion formed body lower end of the partition member inside the piston, further, the first, second hydraulic cylinder pipe is supported by the supporter is disposed in the piston rod. 上記インロー部の外周とピストン内周との間に第２のシール部材を介在させている請求項１の油圧シリンダ。 The hydraulic cylinder according to claim 1, wherein a second seal member is interposed between the outer periphery of the spigot part and the inner periphery of the piston. 隔壁部材の本体とピストンロッドの下端部との間に隔壁部材の回り止め用ピンが嵌合されている請求項１又は２の油圧シリンダ。  The hydraulic cylinder according to claim 1 or 2, wherein a detent pin for the partition member is fitted between a main body of the partition member and a lower end portion of the piston rod. 第１の通路が縦孔と横孔とで構成され、第２の通路がストレートな縦孔で形成され、第１の通路における縦孔内にシール部材を介して第１のパイプの下部を挿入し、第２の通路内に第２のパイプの下部をシール部材を介して挿入させている請求項１，２又は３の油圧シリンダ。  The first passage is constituted by a vertical hole and a horizontal hole, the second passage is formed by a straight vertical hole, and the lower portion of the first pipe is inserted into the vertical hole in the first passage through a seal member. The hydraulic cylinder according to claim 1, 2 or 3, wherein a lower portion of the second pipe is inserted into the second passage through a seal member. サポータが水平な板体で形成され、この板体に形成した二つの孔にそれぞれ第１，第２のパイプを貫通させている請求項１，２，３又は４の油圧シリンダ。  The hydraulic cylinder according to claim 1, 2, 3, or 4, wherein the supporter is formed of a horizontal plate, and the first and second pipes are respectively passed through two holes formed in the plate.
JP03980797A 1997-02-07 1997-02-07 Hydraulic cylinder Expired - Fee Related JP3678865B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP03980797A JP3678865B2 (en) 1997-02-07 1997-02-07 Hydraulic cylinder
KR1019980002184A KR100277427B1 (en) 1997-02-07 1998-01-24 Hydraulic cylinder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03980797A JP3678865B2 (en) 1997-02-07 1997-02-07 Hydraulic cylinder

Publications (2)

Publication Number Publication Date
JPH10220418A JPH10220418A (en) 1998-08-21
JP3678865B2 true JP3678865B2 (en) 2005-08-03

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Country Link
JP (1) JP3678865B2 (en)
KR (1) KR100277427B1 (en)

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JP5176527B2 (en) * 2007-08-17 2013-04-03 コベルコクレーン株式会社 Telescopic boom

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JPH10220418A (en) 1998-08-21
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