JP4059369B2 - Lift cylinder support device for industrial vehicles - Google Patents

Lift cylinder support device for industrial vehicles Download PDF

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Publication number
JP4059369B2
JP4059369B2 JP2000193359A JP2000193359A JP4059369B2 JP 4059369 B2 JP4059369 B2 JP 4059369B2 JP 2000193359 A JP2000193359 A JP 2000193359A JP 2000193359 A JP2000193359 A JP 2000193359A JP 4059369 B2 JP4059369 B2 JP 4059369B2
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Prior art keywords
cylinder tube
cylinder
support
lift cylinder
leg portion
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JP2000193359A
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JP2002003193A (en
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憲二 朝倉
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Komatsu Utility Co Ltd
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Komatsu Utility Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、フォークリフト等の産業車両のリフトシリンダ支持装置に関する。
【0002】
【従来の技術】
フォークリフト等の産業車両におけるリフト装置は、左右一対のリフトシリンダによって昇降駆動される。図10に示すように一対のリフトシリンダ5,5は、それぞれ左右一対の固定マスト1,1に平行に装着されており、その下端部と上部とをそれぞれ固定マスト1に突設された支持部材にて支持されている。一般に、リフトシリンダの下端部の支持方法は、図11に示すように、左右の固定マスト1,1の下部間にわたって架設したロアステー6に形成した孔6aに、シリンダ5の下端面中央部に突設した凸部5aを嵌入して横方向の動きを制限している。
【0003】
図12は、リフトシリンダの上側の支持装置として、特開平8−119594号公報に開示された装置である。取付座81は、リフトシリンダ5のシリンダチューブ5bの外周径と略同等の凹状円弧面を有し、固定マスト1の上部後面に固着されている。また、クランプ82は、リフトシリンダ5のシリンダチューブ5bの外周径と略同等の凹状円弧面を有する略J字型断面の平板状部材である。そして、リフトシリンダ5を固定マスト1に組み付ける場合には、シリンダチューブ5bを緩衝体83,84を介して取付座81とクランプ82とで挟持した状態でクランプ82を取付座81に螺設する。
【0004】
図13は、リフトシリンダ5の上側の支持装置の別の例を示している。ホルダ91は、上部が小径で下部が大径の段付き貫通孔を有しており、上部の孔径はピストンロッド5cの外径よりも十分に大きく、下部の孔径はシリンダチューブ5bの上端部外径よりもやや大きい。そして、リフトシリンダ5を固定マスト1に組み付ける場合には、ホルダ91をシリンダチューブ5b上端部に被せた状態で、ホルダ91を固定マスト1の上部に後方に向かって突設されたブラケット92に螺設する。
【0005】
【発明が解決しようとする課題】
しかしながら、上記従来技術においては以下のような問題がある。
図11に示すような2つの部材81,82でシリンダチューブ5bを側面から挟持して支持する方法においては、シリンダチューブ5bの外径に対して密着した状態に調整できるので、横方向に対して拘束力を持ち振動を防止するが、上下方向(軸方向)に対しては十分な拘束力を得ることができない。このため、悪路走行等によりリフトシリンダ5に軸方向の大きな外力がかかった場合、リフトシリンダ5が上方向に浮いてシリンダ下端の凸部5aがロアステー6の孔6aから抜けてしまうおそれがある。そして、このリフトシリンダ5の抜けを防止する場合には、例えば、シリンダ下端部に抜け止め防止構造を設ける必要があり、シリンダ下端側での組み付け作業が複雑となってしまうと共にコストがかかる。
また、図12に示すような段付き環状部材91でシリンダチューブ5bの上端部を支持する方法においては、軸方向に対して拘束力をもちリフトシリンダ5の脱落を防止できるが、部品寸法のばらつきと組立て性とを考慮して、シリンダ上端部とホルダ91の内径との間に径方向の隙間を設けているため、横方向に振動が発生してしまう。
【0006】
本発明は、上記の課題を解決するために、リフトシリンダの横方向の振動を抑えると共に、シリンダの脱落を確実に防止することのできる産業車両のリフトシリンダ支持装置を提供することを目的としている。
【0007】
【課題を解決するための手段、作用及び効果】
上記の目的を達成するために、本発明は、マストに沿って立設されたリフトシリンダのシリンダチューブの外側面を略対向する方向から挟持して支持する一対の支持部材を備える産業車両のリフトシリンダ支持装置において、一方の前記支持部材は、平面視で略D字型または略J字型であり前記シリンダチューブの外周面よりもやや大きい内周面を有する半円筒部を具え、他方の前記支持部材は、車体側への取付部と、前記取付部の上端から曲折して延出しピストンロッドに当接することなく前記シリンダチューブの上端面に当接可能な上脚部と、前記取付部の下端から前記上脚部と同側に曲折して延出し前記シリンダチューブの側面に当接可能な前記シリンダチューブの外周面と略同等の凹状円弧面を有した先端をもつ下脚部とを具える板材であることを特徴としている。
また、マストに沿って立設されたリフトシリンダのシリンダチューブの外側面を略対向する方向から挟持して支持する一対の支持部材を備えた産業車両のリフトシリンダ支持装置において、一方の前記支持部材は、平面視で略D字型または略J字型であり前記シリンダチューブの外周面よりもやや大きい形状の内周面を有する半円筒部を具えるとともに、ピストンロッドに当接することなく前記シリンダチューブの上端面に当接可能な内方に突出する当接部を有し、他方の前記支持部材は、 車体側への取付部と、前記取付部の上端から曲折して延出し前記シリンダチューブの側面に当接可能な前記シリンダチューブの外周面と略同等の凹状円弧面を有する先端をもつ上脚部と、前記取付部の下端から前記上脚部と同側に曲折して延出し前記シリンダチューブの側面に当接可能な前記上脚部の先端と同心で前記シリンダチューブの外周面と略同等の凹状円弧面を有する先端をもつ下脚部とを具えることを特徴としている。
【0008】
本発明によると、リフトシリンダのシリンダチューブの外側面を、2つの支持部材により対向方向から支持するので、リフトシリンダの横方向に対し拘束力を持ち、横方向の振動を抑えることができると共に、2つの支持部材のうち少なくともいずれか一方の支持部材が、シリンダチューブの上端面に当接可能な当接部を備えているので、車両の悪路走行等によりリフトシリンダに軸方向の大きな外力がかかってリフトシリンダが脱落する程度に浮こうとしても、前記当接部がシリンダチューブの上端面を押さえてリフトシリンダの上方向への動きを拘束できるので、リフトシリンダの脱落を確実に防止できる。
また、一方の支持部材を、車体側への取付部と、前記シリンダチューブの上端面に当接可能な上脚部と、前記シリンダチューブの側面に当接可能な下脚部とを有する部材とした場合には、板材を板金加工して容易に製作できる。特に、上脚部はその下面でシリンダチューブの上端面に当接する機能を有するだけでよいので、下脚部との位置関係を含む上脚部の寸法精度は荒くてよいのでコストを低く製作できる。
【0009】
【発明の実施の形態】
以下、図面を参照しながら、本発明に係る実施形態について詳細に説明する。図1に示すように、フォークリフト等の産業車両におけるリフト装置は、車両の前部に装着された左右一対の固定マスト1,1と、固定マスト1,1に沿って昇降自在に固定マスト1,1に装着された左右一対の可動マスト2,2と、可動マスト2,2に沿って昇降自在に可動マスト2,2に装着されたフィンガーボード3と、フィンガーボード3の前部に装着された左右一対のフォーク4,4とを有している。
固定マスト1,1の後方には、固定マスト1,1と平行に一対のリフトシリンダ5,5がそれぞれ固定マスト1,1に装着されている。リフトシリンダ5の下端部は、左右の固定マスト1,1の下部間にわたって架設したロアステー6に形成した孔6a(図11参照)に、リフトシリンダ5のシリンダチューブ5bの下端面中央部に突設した凸部5aを嵌入して支持され、リフトシリンダ5のシリンダチューブ5bの上端部は、後述する支持装置10により支持されている。
【0010】
リフトシリンダ5のピストンロッド5cは、左右の可動マスト2,2の上部間にわたって架設したヘッドステー6に固着されている。可動マスト2の上部にはプーリ7が装着されており、一端が固定マスト1に、他端がフィンガーボード3に固着されたチェーン8がこのプーリ7に巻架されている。
上記構成により、リフトシリンダ5を伸縮駆動することにより、可動マスト2を昇降駆動し、そしてチェーン8を介してフィンガーボード3及びフォーク4が昇降駆動される。
【0011】
リフトシリンダ5の上側の支持装置の第1実施形態について、図2及び図3を用いて詳細に説明する。
支持装置10は、支持部材であるクランプ11とサポート12とでシリンダチューブ5bを挟持して、固定マスト1に取着されたブラケット9に螺設することでリフトシリンダ5を支持している。
クランプ11は、部材の幅方向を上下方向とする板材を平面視で略D字型をなすように成形したものであり、シリンダチューブ5bの外周面よりもやや大きい内周面を有する半円筒部11aと、半円筒部11aから延びる脚部11b,11bと、脚部11b,11bの先端からそれぞれ内方に曲折し先端が対向する取付部11c,11cとを有している。取付部11cにはそれぞれ、先端からU字型の切欠き11d,11dが設けられている。
【0012】
サポート12は、シリンダチューブ5bの外径よりもやや狭い幅Hを有し、部材の幅方向を車両の前後方向とする板材を前後方向から見て略コ字型をなすように成形したものであり、内面に前後2個のナット12d,12dが溶接された取付部12cと、取付部12c上端から曲折し水平方向に延出する上脚部12aと、取付部12c下端から曲折し水平方向に延出する下脚部12bとを有している。下脚部12bの先端は、シリンダチューブ5bの外周面と略同等の凹状円弧面を有している。上脚部12aの先端は、下脚部12bの先端の凹状円弧面と同心で、かつピストンロッド5cの外径よりも大きくシリンダチューブ5bの外径よりも小さい径を有する凹状円弧面を有している。
【0013】
ブラケット9は、シリンダチューブ5bの上端部と略同等の高さの位置に、固定マスト1の左右外側面から後方に突設された平板状のもので、後方突出部には前後2個の縦方向の長孔9a,9aを備えている。
支持装置10の装着時に用いる部品として、ボルト15,15と、金属プレート16に固着された緩衝用のブッシュ17と、ブッシュ17の締め代を管理するカラー18,18と、シム19とがある。
【0014】
上記支持装置10を用いて、リフトシリンダ5を固定マスト1に組み付ける作業について説明する。まず、リフトシリンダ5の下端部の凸部5aをロアステー6の孔6aに嵌入する。ついで、サポート12を、その上脚部12aの下面がシリンダチューブ5bの上端面に、そしてその下脚部12bの凹状円弧面がシリンダチューブ5bの外周にそれぞれ当接する状態で、クランプ11をシリンダチューブ5bの上端部側面及びサポート12を覆うようにして配置し、クランプ11の半円筒部11aの内面とサポート12の下脚部12bの凹状円弧面とがシリンダチューブ5bの外周に密着するように、クランプ11の取付部11cとサポート12の取付部12cとの間にシム19を押入して、クランプ11とサポート12とでシリンダチューブ5bを挟持する。ついで、ブラケット9とカラー18とブッシュ17とを挟んでボルト15をサポート12のナット12dに螺合することにより、リフトシリンダ5の固定マスト1への組み付けが完了する。
なお、必要に応じてクランプ11の取付部11cとブラケット9との間にシム19を挿入して、リフトシリンダ5と固定マスト1との平行度を調整する。
【0015】
本実施形態によれば、車両の悪路走行等によりリフトシリンダ5に軸方向の外力が作用しても、サポート12の上脚部12aがシリンダチューブ5bの上端面を拘束するので、リフトシリンダ5の下端部の凸部5aがロアステー6の孔6aから抜けることはない。これにより、リフトシリンダ5の脱落を防止できると共に、リフトシリンダ5の下端部には抜け止め構造を設ける必要がなく上端部のみに取り付けるだけでよく、凸部5aと孔6aとの組み合わせでよいので、組立作業が複雑になることもなくコストも抑えることができる。
また、支持装置10は、クランプ11の半円筒部11aの内面とサポート12の下脚部12bの凹状円弧面との2つの対向する支持面を用いているので、シリンダチューブ5bの外周面に対して2つの支持面が密着するようにシム19による調整ができる。これにより、支持装置10はリフトシリンダ5の横方向に対しても拘束力を有し、リフトシリンダ5の横方向の振動を抑えることができる。
また、当接部である上脚部12aを有するサポート12は、板材を板金加工して容易に製作できる。特に、上脚部12aはその下面でシリンダチューブ5bの上端面に当接する機能を有するだけでよいので、下脚部12bとの位置関係を含む上脚部12aの寸法精度は荒くてよいのでコストを低く製作できる。
【0016】
リフトシリンダ5の上側の支持装置20の第2実施形態について、図4を用いて説明する。第1実施形態と同一のものは、同一符号を付して説明を省略する。クランプ21は、部材の幅方向を上下方向とする板材を平面視で略D字型をなすように成形したものであり、シリンダチューブ5bの外周面よりもやや大きい内周面を有する半円筒部21aと、半円筒部21aから延びる脚部21b,21bと、脚部21b,21bの先端からそれぞれ内方に曲折し先端が対向する取付部21cとを有している。取付部21cの内面にはそれぞれ、ナット21d,21dが溶接されている。
【0017】
サポート22は、シリンダチューブ5bの外径程度の幅を有し、部材の幅方向を車両の前後方向とする板材を前後方向から見て略コ字型をなすように成形したものであり、前後2個の取付孔22d,22dが設けられた取付部22cと、取付部22c上端から曲折し水平方向に延出する上脚部22aと、取付部22c下端から曲折し水平方向に延出する下脚部22bとを有している。下脚部22bの先端は、シリンダチューブ5bの外周面と略同等の凹状円弧面を有している。上脚部22aの先端は、下脚部22bの先端の凹状円弧面と同心で、かつピストンロッド5cの外径よりも大きくシリンダチューブ5bの外径よりも小さい径を有する凹状円弧面を有している。また、上脚部22aと下脚部22bとの間隔は、クランプ21の幅よりもやや大きい。
【0018】
上記支持装置20を用いて、リフトシリンダ5を固定マスト1に組み付ける作業について説明する。まず、リフトシリンダ5の下端部の凸部5aをロアステー6の孔6aに嵌入する。ついで、クランプ21をシリンダチューブ5bの上端部側面を覆うようにして配置し、サポート22を、その上脚部22aの下面がシリンダチューブ5bの上端面に、そしてその下脚部22bの凹状円弧面がシリンダチューブ5bの外周にそれぞれ当接する状態(このとき、クランプ21の取付部22cはサポート22の上脚部22aと下脚部22bとの間に位置する)で、ブラケット9とカラー18とブッシュ17とを挟んでボルト15をクランプ21のナット21dに仮止めし、必要に応じてサポート22の取付部22cとブラケット9との間にシム19を挿入して、リフトシリンダ5と固定マスト1との平行度を調整する。ついで、仮止めしたボルト15を締め込んでリフトシリンダ5の固定マスト1への組み付けが完了する。
【0019】
本実施形態によれば、第1実施形態と同様に、車両の悪路走行等によりリフトシリンダ5に軸方向の外力が作用しても、サポート22の上脚部22aがシリンダチューブ5bの上端面を拘束するので、リフトシリンダ5の下端部の凸部5aがロアステー6の孔6aから抜けることはない。これにより、リフトシリンダ5の脱落を防止できると共に、リフトシリンダ5の下端部には抜け止め構造を設ける必要がなく上端部のみに取り付けるだけでよく、凸部5aと孔6aとの組み合わせでよいので、組立作業が複雑になることもなくコストも抑えることができる。
また、ボルト15の締め付け力を大きくするにつれて、クランプ21の半円筒部21aの内面とサポート22の下脚部22bの凹状円弧面との2つの対向する支持面による挟持力を大きくできる。これにより、リフトシリンダ5の横方向に対しても十分な拘束力を有し、リフトシリンダ5の横方向の振動を抑えることができると共に、ある程度の軸方向の外力を支持することも可能となり、サポート22の上脚部22aの負担を軽くすることができ、耐久性を向上できる。
また、当接部である上脚部22aを有するサポート22は、板材を板金加工して容易に製作できる。特に、上脚部22aはその下面でシリンダチューブ5bの上端面に当接する機能を有するだけでよいので、下脚部22bとの位置関係を含む上脚部22aの寸法精度は荒くてよいのでコストを低く製作できる。
【0020】
以上説明した実施形態においては、シリンダチューブ5bの上端面への当接可能な部材として、サポート12,22の上脚部12a,22aを用いた例にて説明したが、図5に示すように、クランプ31の半円筒部31aの上端部から内方に突出する1以上の爪31eにその機能を持たせるように構成してもよい。この場合、サポート32側にはシリンダチューブ5bの上端面への当接可能な部材は不要で、上脚部32aも下脚部32bと同形状でよく、シリンダチューブ5bの外周に当接するようになる。爪31eは、曲げ加工によって形成するように図示したが、溶接等の他の方法によって形成してもよい。
また、サポート12は板材をプレス成形し、ナット12dを溶接した例にて説明したが、ブロック状でもよい。例えば、図6のサポート42は図5に示したサポート32の代わりになり、図7のサポート52(上脚部12aに対応する突出部52aを有している)は図3にて説明したサポート12の代わりになる。サポート42,52はそれぞれ前後2つのネジ孔42d,42d,52d,52dを備えている。
また、シリンダチューブ5bの外周に当接する部位の形状は円弧の例にて説明したが、図8に示すように、シリンダチューブ5bの外周への当接面が平面であるクランプ61及びサポート62を用いてもよい。
また、図9に示すように、略D字型の断面の代わりに略J字型の断面のクランプ71でもかまわない。
【0021】
さらに、シリンダチューブ5bの上端面への当接可能な部材を、サポート及びクランプのいずれか一方に設けた例にて説明したが、両方に設けてもかまわない。
また、実施形態の説明においては、シリンダチューブ5bの上端面への当接可能な部材(サポート12の上脚部12aやクランプ31の爪31e等)をシリンダチューブ5bの上端面に当接した状態でリフトシリンダ5を組み付ける例にて説明したが、この当接可能な部材とシリンダチューブ5bの上端面とを所定距離(シリンダ下端の凸部5aがロアステー6の孔6aから抜けない程度)離間させて組み付けてもよい。これにより、通常の作業時や通常の走行時に生じる小さな振動を押さえる場合に受ける繰り返し荷重を受けず、悪路走行等によりリフトシリンダ5が脱落する程度に浮いたときのみシリンダチューブ5bの上端面を押さえる反力を受けるだけなので、シリンダチューブ5bの上端面への当接可能な部材の耐久性を向上することができる。
【0022】
以上説明したように、本発明によれば、シリンダチューブの上端部側面を、2つの支持部材を密着させて支持するので、リフトシリンダの横方向の振動を抑えることができ、また、シリンダチューブの上端面への当接可能な部材を備えているので、悪路走行等によりリフトシリンダが脱落する程度に浮いてもリフトシリンダの脱落を確実に防止することができる。
【図面の簡単な説明】
【図1】本発明を適用するリフト装置の側面図である。
【図2】本発明の第1実施形態の部分平面断面図である。
【図3】本発明の第1実施形態の分解斜視図である。
【図4】本発明の第2実施形態の分解斜視図及び部分平面断面図である。
【図5】本発明の実施形態の別態様の分解斜視図及び平面図である。
【図6】本発明の実施形態の別態様の斜視図である。
【図7】本発明の実施形態の別態様の斜視図である。
【図8】本発明の実施形態の別態様の分解斜視図及び平面図である。
【図9】本発明の実施形態の別態様の斜視図である。
【図10】従来技術の説明図である。
【図11】従来技術の説明図である。
【図12】従来技術の支持装置の平面断面図である。
【図13】従来技術の支持装置の側面図である。
【符号の説明】
1…固定マスト、2…可動マスト、5…リフトシリンダ、5b…シリンダチューブ、5c…ピストンロッド、9…ブラケット、10,20…支持装置、11,21,31,61,71…クランプ、11a,21a,31a…半円筒部、11c,21c…取付部、12,22,32,42,52,62…サポート、12a,22a,32a,52a…上脚部、12b,22b,32b…下脚部、12c,22c…取付部、17…ブッシュ、18…カラー、19…シム、31e…爪。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lift cylinder support device for an industrial vehicle such as a forklift.
[0002]
[Prior art]
A lift device in an industrial vehicle such as a forklift is driven up and down by a pair of left and right lift cylinders. As shown in FIG. 10, the pair of lift cylinders 5, 5 are mounted in parallel to the pair of left and right fixed masts 1, 1, and the lower end and the upper part of the support members project from the fixed mast 1. It is supported by. In general, as shown in FIG. 11, the lift cylinder is supported by a hole 6 a formed in the lower stay 6 extending between the lower portions of the left and right fixed masts 1, 1 so as to protrude from the center of the lower end surface of the cylinder 5. The provided convex part 5a is inserted and the movement of the horizontal direction is restrict | limited.
[0003]
FIG. 12 shows a device disclosed in Japanese Patent Laid-Open No. 8-119594 as a support device on the upper side of the lift cylinder. The mounting seat 81 has a concave arc surface substantially the same as the outer diameter of the cylinder tube 5 b of the lift cylinder 5, and is fixed to the upper rear surface of the fixed mast 1. The clamp 82 is a flat plate-like member having a substantially J-shaped cross section having a concave arc surface substantially the same as the outer peripheral diameter of the cylinder tube 5 b of the lift cylinder 5. When the lift cylinder 5 is assembled to the fixed mast 1, the clamp 82 is screwed to the mounting seat 81 in a state where the cylinder tube 5 b is sandwiched between the mounting seat 81 and the clamp 82 via the buffer bodies 83 and 84.
[0004]
FIG. 13 shows another example of the support device on the upper side of the lift cylinder 5. The holder 91 has a stepped through hole having a small diameter at the top and a large diameter at the bottom, the diameter of the top is sufficiently larger than the outside diameter of the piston rod 5c, and the bottom diameter is outside the upper end of the cylinder tube 5b. Slightly larger than the diameter. When the lift cylinder 5 is assembled to the fixed mast 1, the holder 91 is screwed onto a bracket 92 projecting rearward from the upper portion of the fixed mast 1 with the holder 91 placed on the upper end of the cylinder tube 5 b. Set up.
[0005]
[Problems to be solved by the invention]
However, the above prior art has the following problems.
In the method of sandwiching and supporting the cylinder tube 5b from the side surfaces with the two members 81 and 82 as shown in FIG. 11, the cylinder tube 5b can be adjusted to be in close contact with the outer diameter of the cylinder tube 5b. Although it has a restraining force and prevents vibration, a sufficient restraining force cannot be obtained in the vertical direction (axial direction). For this reason, when a large external force in the axial direction is applied to the lift cylinder 5 due to rough road traveling or the like, the lift cylinder 5 may float upward and the convex portion 5a at the lower end of the cylinder may come out of the hole 6a of the lower stay 6. . In order to prevent the lift cylinder 5 from coming off, for example, it is necessary to provide an anti-detachment structure at the lower end of the cylinder, which complicates the assembling work at the lower end of the cylinder and increases costs.
Further, in the method of supporting the upper end portion of the cylinder tube 5b with the stepped annular member 91 as shown in FIG. 12, it is possible to prevent the lift cylinder 5 from falling off while having a restraining force in the axial direction. In consideration of assembly and ease of assembly, a radial gap is provided between the upper end of the cylinder and the inner diameter of the holder 91, so that vibration occurs in the lateral direction.
[0006]
SUMMARY OF THE INVENTION In order to solve the above-described problems, an object of the present invention is to provide a lift cylinder support device for an industrial vehicle that can suppress lateral vibration of the lift cylinder and reliably prevent the cylinder from dropping off. .
[0007]
[Means, actions and effects for solving the problems]
In order to achieve the above object, the present invention provides a lift for an industrial vehicle comprising a pair of support members that sandwich and support the outer surface of a cylinder tube of a lift cylinder installed upright along a mast from a substantially opposing direction. In the cylinder support device, one of the support members includes a semi-cylindrical portion that is substantially D-shaped or substantially J-shaped in plan view and has an inner peripheral surface that is slightly larger than the outer peripheral surface of the cylinder tube, The support member includes a mounting portion on the vehicle body side, an upper leg portion that bends and extends from the upper end of the mounting portion and can contact the upper end surface of the cylinder tube without contacting the piston rod, and the mounting portion A lower leg portion having a distal end having a concave arc surface substantially the same as an outer peripheral surface of the cylinder tube which is bent from the lower end to the same side as the upper leg portion and extends to be in contact with a side surface of the cylinder tube; Board It is characterized in that it.
Further, in the lift cylinder support device for an industrial vehicle provided with a pair of support members that sandwich and support the outer surface of the cylinder tube of the lift cylinder erected along the mast from a substantially opposing direction, one of the support members Includes a semi-cylindrical portion that is substantially D-shaped or substantially J-shaped in plan view and has an inner peripheral surface that is slightly larger than the outer peripheral surface of the cylinder tube, and the cylinder without contacting the piston rod An inwardly projecting abutting portion capable of abutting on an upper end surface of the tube, and the other support member includes a mounting portion on a vehicle body side and a bent portion extending from the upper end of the mounting portion. An upper leg portion having a tip having a concave arcuate surface substantially equivalent to the outer peripheral surface of the cylinder tube capable of abutting on the side surface of the cylinder tube, and bends and extends from the lower end of the mounting portion to the same side as the upper leg portion. Shi A lower leg portion having a tip end having a concave arc surface that is concentric with a tip end of the upper leg portion capable of contacting the side surface of the Linda tube and substantially equal to an outer peripheral surface of the cylinder tube is provided.
[0008]
According to the present invention, since the outer surface of the cylinder tube of the lift cylinder is supported from the opposing direction by the two support members, it has a restraining force in the lateral direction of the lift cylinder and can suppress lateral vibration. Since at least one of the two support members includes a contact portion that can contact the upper end surface of the cylinder tube, a large external force in the axial direction is applied to the lift cylinder due to a rough road traveling of the vehicle. Even if the lift cylinder floats to such an extent that it falls off, the contact portion can hold the upper end surface of the cylinder tube and restrain the upward movement of the lift cylinder, so that the lift cylinder can be reliably prevented from falling off.
Further, the one supporting member is a member having a mounting portion on the vehicle body side, an upper leg portion that can be in contact with the upper end surface of the cylinder tube, and a lower leg portion that can be in contact with the side surface of the cylinder tube. In some cases, the sheet material can be easily manufactured by sheet metal processing. In particular, since the upper leg portion only needs to have a function of contacting the upper end surface of the cylinder tube at the lower surface, the dimensional accuracy of the upper leg portion including the positional relationship with the lower leg portion may be rough, so that the cost can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a lift device in an industrial vehicle such as a forklift includes a pair of left and right fixed masts 1, 1 mounted on the front of the vehicle, and a fixed mast 1 that can be raised and lowered along the fixed masts 1, 1. A pair of left and right movable masts 2 and 2 attached to 1, a fingerboard 3 attached to the movable masts 2 and 2 so as to be movable up and down along the movable masts 2 and 2, and a front part of the fingerboard 3 It has a pair of left and right forks 4 and 4.
A pair of lift cylinders 5, 5 are mounted on the fixed masts 1, 1 behind the fixed masts 1, 1 in parallel with the fixed masts 1, 1, respectively. The lower end portion of the lift cylinder 5 protrudes from the center of the lower end surface of the cylinder tube 5b of the lift cylinder 5 in a hole 6a (see FIG. 11) formed in the lower stay 6 installed between the lower portions of the left and right fixed masts 1 and 1. The raised portion 5a is inserted and supported, and the upper end portion of the cylinder tube 5b of the lift cylinder 5 is supported by a support device 10 described later.
[0010]
The piston rod 5c of the lift cylinder 5 is fixed to a head stay 6 that extends between the upper portions of the left and right movable masts 2,2. A pulley 7 is attached to the upper portion of the movable mast 2, and a chain 8 having one end fixed to the fixed mast 1 and the other end fixed to the fingerboard 3 is wound around the pulley 7.
With the above configuration, the movable mast 2 is driven up and down by driving the lift cylinder 5 to extend and contract, and the fingerboard 3 and the fork 4 are driven up and down via the chain 8.
[0011]
A first embodiment of the support device on the upper side of the lift cylinder 5 will be described in detail with reference to FIGS. 2 and 3.
The support device 10 supports the lift cylinder 5 by sandwiching the cylinder tube 5b between the clamp 11 and the support 12 which are support members and screwing the cylinder tube 5 to the bracket 9 attached to the fixed mast 1.
The clamp 11 is a semi-cylindrical portion having an inner peripheral surface that is slightly larger than the outer peripheral surface of the cylinder tube 5b. 11 a, leg portions 11 b and 11 b extending from the semi-cylindrical portion 11 a, and attachment portions 11 c and 11 c that are bent inward from the tip ends of the leg portions 11 b and 11 b and are opposed to each other at the tip ends. The attachment portion 11c is provided with U-shaped notches 11d and 11d from the tip.
[0012]
The support 12 has a width H slightly narrower than the outer diameter of the cylinder tube 5b, and is formed so as to form a substantially U-shape when a plate member whose width direction is the front-rear direction of the vehicle is viewed from the front-rear direction. There are a mounting portion 12c having two inner and rear nuts 12d and 12d welded to the inner surface, an upper leg portion 12a bent from the upper end of the mounting portion 12c and extending in the horizontal direction, and bent from the lower end of the mounting portion 12c in the horizontal direction. The lower leg portion 12b extends. The tip of the lower leg portion 12b has a concave arc surface substantially equivalent to the outer peripheral surface of the cylinder tube 5b. The tip of the upper leg 12a has a concave arc surface that is concentric with the concave arc surface of the tip of the lower leg portion 12b and has a diameter that is larger than the outer diameter of the piston rod 5c and smaller than the outer diameter of the cylinder tube 5b. Yes.
[0013]
The bracket 9 is a flat plate projecting rearward from the left and right outer surfaces of the fixed mast 1 at a position substantially the same as the upper end of the cylinder tube 5b. Directional long holes 9a and 9a are provided.
As parts used when the support device 10 is mounted, there are bolts 15 and 15, a shock-absorbing bush 17 fixed to the metal plate 16, collars 18 and 18 that manage a tightening margin of the bush 17, and a shim 19.
[0014]
An operation of assembling the lift cylinder 5 to the fixed mast 1 using the support device 10 will be described. First, the convex portion 5 a at the lower end of the lift cylinder 5 is fitted into the hole 6 a of the lower stay 6. Next, with the support 12 in a state where the lower surface of the upper leg portion 12a is in contact with the upper end surface of the cylinder tube 5b and the concave arc surface of the lower leg portion 12b is in contact with the outer periphery of the cylinder tube 5b, the clamp 11 is fixed to the cylinder tube 5b. The clamp 11 is disposed so as to cover the side surface of the upper end portion of the clamp 11 and the support 12 so that the inner surface of the semi-cylindrical portion 11a of the clamp 11 and the concave arc surface of the lower leg portion 12b of the support 12 are in close contact with the outer periphery of the cylinder tube 5b. The shim 19 is pushed in between the mounting portion 11 c and the mounting portion 12 c of the support 12, and the cylinder tube 5 b is sandwiched between the clamp 11 and the support 12. Next, the bolt 15 is screwed into the nut 12d of the support 12 with the bracket 9, the collar 18 and the bush 17 interposed therebetween, whereby the assembly of the lift cylinder 5 to the fixed mast 1 is completed.
If necessary, a shim 19 is inserted between the mounting portion 11c of the clamp 11 and the bracket 9 to adjust the parallelism between the lift cylinder 5 and the fixed mast 1.
[0015]
According to the present embodiment, the upper leg 12a of the support 12 restrains the upper end surface of the cylinder tube 5b even when an axial external force is applied to the lift cylinder 5 due to a rough road traveling of the vehicle. The convex part 5 a at the lower end of the lower stay 6 does not come out of the hole 6 a of the lower stay 6. As a result, the lift cylinder 5 can be prevented from falling off, and the lower end portion of the lift cylinder 5 does not need to be provided with a retaining structure, and only needs to be attached to the upper end portion. The combination of the convex portion 5a and the hole 6a is sufficient. The assembly work is not complicated and the cost can be reduced.
Further, since the support device 10 uses two opposing support surfaces, that is, the inner surface of the semi-cylindrical portion 11a of the clamp 11 and the concave arc surface of the lower leg portion 12b of the support 12, the support device 10 has an outer peripheral surface of the cylinder tube 5b. The shim 19 can be adjusted so that the two support surfaces are in close contact. As a result, the support device 10 also has a restraining force in the lateral direction of the lift cylinder 5, and can suppress vibration in the lateral direction of the lift cylinder 5.
Further, the support 12 having the upper leg portion 12a as a contact portion can be easily manufactured by processing a plate material into a sheet metal. In particular, since the upper leg portion 12a only needs to have a function of contacting the upper end surface of the cylinder tube 5b at the lower surface, the dimensional accuracy of the upper leg portion 12a including the positional relationship with the lower leg portion 12b may be rough, so that the cost is reduced. Can be manufactured low.
[0016]
A second embodiment of the support device 20 on the upper side of the lift cylinder 5 will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. The clamp 21 is a semi-cylindrical portion having an inner peripheral surface that is slightly larger than the outer peripheral surface of the cylinder tube 5b. 21a, leg portions 21b and 21b extending from the semi-cylindrical portion 21a, and attachment portions 21c which are bent inward from the tips of the leg portions 21b and 21b and face the tips. Nuts 21d and 21d are welded to the inner surface of the attachment portion 21c, respectively.
[0017]
The support 22 has a width approximately equal to the outer diameter of the cylinder tube 5b, and is formed so as to form a substantially U-shape when a plate member whose width direction is the front-rear direction of the vehicle is viewed from the front-rear direction. An attachment portion 22c provided with two attachment holes 22d, 22d, an upper leg portion 22a bent from the upper end of the attachment portion 22c and extending in the horizontal direction, and a lower leg bent from the lower end of the attachment portion 22c and extended in the horizontal direction Part 22b. The tip of the lower leg portion 22b has a concave arc surface substantially equivalent to the outer peripheral surface of the cylinder tube 5b. The tip of the upper leg 22a has a concave arc surface that is concentric with the concave arc surface of the tip of the lower leg portion 22b and has a diameter that is larger than the outer diameter of the piston rod 5c and smaller than the outer diameter of the cylinder tube 5b. Yes. Further, the distance between the upper leg portion 22 a and the lower leg portion 22 b is slightly larger than the width of the clamp 21.
[0018]
An operation of assembling the lift cylinder 5 to the fixed mast 1 using the support device 20 will be described. First, the convex portion 5 a at the lower end of the lift cylinder 5 is fitted into the hole 6 a of the lower stay 6. Next, the clamp 21 is disposed so as to cover the side surface of the upper end portion of the cylinder tube 5b, and the support 22 has the lower surface of the upper leg portion 22a at the upper end surface of the cylinder tube 5b and the concave arc surface of the lower leg portion 22b. The bracket 9, the collar 18, and the bush 17 are in contact with the outer periphery of the cylinder tube 5 b (at this time, the attachment portion 22 c of the clamp 21 is located between the upper leg portion 22 a and the lower leg portion 22 b of the support 22). The bolts 15 are temporarily fixed to the nuts 21d of the clamps 21 and the shims 19 are inserted between the mounting portions 22c of the support 22 and the brackets 9 as necessary, so that the lift cylinder 5 and the fixed mast 1 are parallel to each other. Adjust the degree. Next, the temporarily tightened bolt 15 is tightened to complete the assembly of the lift cylinder 5 to the fixed mast 1.
[0019]
According to this embodiment, similarly to the first embodiment, even if an axial external force acts on the lift cylinder 5 due to a rough road traveling of the vehicle, the upper leg portion 22a of the support 22 is the upper end surface of the cylinder tube 5b. Therefore, the convex portion 5 a at the lower end of the lift cylinder 5 does not come out of the hole 6 a of the lower stay 6. As a result, the lift cylinder 5 can be prevented from falling off, and the lower end portion of the lift cylinder 5 does not need to be provided with a retaining structure, and only needs to be attached to the upper end portion. The combination of the convex portion 5a and the hole 6a is sufficient. The assembly work is not complicated and the cost can be reduced.
Further, as the tightening force of the bolt 15 is increased, the clamping force by the two opposing support surfaces of the inner surface of the semi-cylindrical portion 21a of the clamp 21 and the concave arc surface of the lower leg portion 22b of the support 22 can be increased. Thereby, it has sufficient restraining force also in the lateral direction of the lift cylinder 5, can suppress the lateral vibration of the lift cylinder 5, and can also support a certain amount of external force in the axial direction. The load on the upper leg portion 22a of the support 22 can be reduced, and the durability can be improved.
Further, the support 22 having the upper leg portion 22a which is an abutting portion can be easily manufactured by processing a plate material. In particular, since the upper leg portion 22a only needs to have a function of contacting the upper end surface of the cylinder tube 5b at the lower surface, the dimensional accuracy of the upper leg portion 22a including the positional relationship with the lower leg portion 22b may be rough, so that the cost is reduced. Can be manufactured low.
[0020]
In the embodiment described above, the example in which the upper legs 12a and 22a of the supports 12 and 22 are used as members capable of contacting the upper end surface of the cylinder tube 5b has been described. However, as shown in FIG. The one or more claws 31e protruding inward from the upper end of the semi-cylindrical portion 31a of the clamp 31 may be configured to have the function. In this case, a member that can contact the upper end surface of the cylinder tube 5b is not necessary on the support 32 side, and the upper leg portion 32a may have the same shape as the lower leg portion 32b and comes into contact with the outer periphery of the cylinder tube 5b. . Although the claw 31e is illustrated as being formed by bending, it may be formed by other methods such as welding.
Moreover, although the support 12 demonstrated in the example which press-molded the board | plate material and welded the nut 12d, a block shape may be sufficient. For example, the support 42 shown in FIG. 6 replaces the support 32 shown in FIG. 5, and the support 52 shown in FIG. 7 (having a protrusion 52a corresponding to the upper leg 12a) is the support described in FIG. Instead of twelve. Each of the supports 42 and 52 includes two screw holes 42d, 42d, 52d, and 52d.
Moreover, although the shape of the site | part contact | abutted on the outer periphery of the cylinder tube 5b was demonstrated in the example of the circular arc, as shown in FIG. 8, the clamp 61 and the support 62 whose contact surface to the outer periphery of the cylinder tube 5b is flat are shown. It may be used.
Further, as shown in FIG. 9, a clamp 71 having a substantially J-shaped cross section may be used instead of the substantially D-shaped cross section.
[0021]
Furthermore, although the member which can contact | abut to the upper end surface of the cylinder tube 5b was demonstrated in the example provided in any one of a support and a clamp, you may provide in both.
In the description of the embodiment, a member that can contact the upper end surface of the cylinder tube 5b (the upper leg portion 12a of the support 12, the claw 31e of the clamp 31, etc.) is in contact with the upper end surface of the cylinder tube 5b. In the example of assembling the lift cylinder 5, the contactable member and the upper end surface of the cylinder tube 5b are separated from each other by a predetermined distance (so that the convex portion 5a at the lower end of the cylinder does not come out of the hole 6a of the lower stay 6). May be assembled. As a result, the upper end surface of the cylinder tube 5b is not subjected to the repeated load received when suppressing small vibrations generated during normal work or normal travel, and only when the lift cylinder 5 floats to such an extent that it drops off due to rough road travel or the like. Since only the reaction force to be pressed is received, the durability of the member that can come into contact with the upper end surface of the cylinder tube 5b can be improved.
[0022]
As described above, according to the present invention, since the upper end side surface of the cylinder tube is supported with the two support members being in close contact with each other, the lateral vibration of the lift cylinder can be suppressed. Since the member capable of contacting the upper end surface is provided, it is possible to reliably prevent the lift cylinder from dropping even if the lift cylinder floats to such an extent that the lift cylinder falls off due to traveling on a rough road or the like.
[Brief description of the drawings]
FIG. 1 is a side view of a lift device to which the present invention is applied.
FIG. 2 is a partial plan sectional view of the first embodiment of the present invention.
FIG. 3 is an exploded perspective view of the first embodiment of the present invention.
FIG. 4 is an exploded perspective view and a partial plan sectional view of a second embodiment of the present invention.
FIG. 5 is an exploded perspective view and a plan view of another aspect of the embodiment of the present invention.
FIG. 6 is a perspective view of another aspect of the embodiment of the present invention.
FIG. 7 is a perspective view of another aspect of the embodiment of the present invention.
FIG. 8 is an exploded perspective view and a plan view of another aspect of the embodiment of the present invention.
FIG. 9 is a perspective view of another aspect of the embodiment of the present invention.
FIG. 10 is an explanatory diagram of the prior art.
FIG. 11 is an explanatory diagram of a conventional technique.
FIG. 12 is a cross-sectional plan view of a prior art support device.
FIG. 13 is a side view of a prior art support device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Fixed mast, 2 ... Movable mast, 5 ... Lift cylinder, 5b ... Cylinder tube, 5c ... Piston rod, 9 ... Bracket, 10, 20 ... Supporting device, 11, 21, 31, 61, 71 ... Clamp, 11a, 21a, 31a ... semi-cylindrical part, 11c, 21c ... mounting part, 12, 22, 32, 42, 52, 62 ... support, 12a, 22a, 32a, 52a ... upper leg part, 12b, 22b, 32b ... lower leg part, 12c, 22c ... mounting portion, 17 ... bush, 18 ... collar, 19 ... shim, 31e ... claw.

Claims (2)

マスト(1)に沿って立設されたリフトシリンダ(5)のシリンダチューブ(5b)の外側面を略対向する方向から挟持して支持する一対の支持部材(11,12)を備える産業車両のリフトシリンダ支持装置において、
一方の前記支持部材(11)は、平面視で略D字型または略J字型であり前記シリンダチューブ(5b)の外周面よりもやや大きい内周面を有する半円筒部を具え、
他方の前記支持部材(12)は、車体側への取付部(12c)と、前記取付部(12c)の上端から曲折して延出しピストンロッド(5c)に当接することなく前記シリンダチューブ(5b)の上端面に当接可能な上脚部(12a)と、前記取付部(12c)の下端から前記上脚部(12a)と同側に曲折して延出し前記シリンダチューブ(5b)の側面に当接可能な前記シリンダチューブ(5b)の外周面と略同等の凹状円弧面を有した先端をもつ下脚部(12b)とを具える板材である
ことを特徴とする産業車両のリフトシリンダ支持装置。
An industrial vehicle comprising a pair of support members (11, 12) that support by sandwiching and supporting the outer surface of a cylinder tube (5b) of a lift cylinder (5) erected along a mast (1) from a substantially opposite direction. In the lift cylinder support device,
One of the support members (11) includes a semi-cylindrical portion that is substantially D-shaped or substantially J-shaped in plan view and has an inner peripheral surface that is slightly larger than the outer peripheral surface of the cylinder tube (5b),
The other support member (12) includes a mounting portion (12c) on the vehicle body side and a cylinder tube (5b) that is bent from the upper end of the mounting portion (12c) and does not contact the piston rod (5c). ) And an upper leg portion (12a) capable of contacting the upper end surface of the cylinder tube (5b) .The upper leg portion (12a) is bent from the lower end of the mounting portion (12c) to the same side as the upper leg portion (12a). A lift cylinder support for an industrial vehicle, comprising: a lower leg portion (12b) having a tip having a concave arc surface substantially equivalent to an outer peripheral surface of the cylinder tube (5b) capable of contacting the cylinder tube (5b) apparatus.
マスト(1)に沿って立設されたリフトシリンダ(5)のシリンダチューブ(5b)の外側面を略対向する方向から挟持して支持する一対の支持部材(31,32)を備えた産業車両のリフトシリンダ支持装置において、
一方の前記支持部材(31)は、平面視で略D字型または略J字型であり前記シリンダチューブ(5b)の外周面よりもやや大きい形状の内周面を有する半円筒部を具えるとともに、ピストンロッド(5c)に当接することなく前記シリンダチューブ(5b)の上端面に当接可能な内方に突出する当接部(31e)を有し、
他方の前記支持部材(32)は、 車体側への取付部と、前記取付部の上端から曲折して延出し前記シリンダチューブ(5b)の側面に当接可能な前記シリンダチューブ(5b)の外周面と略同等の凹状円弧面を有する先端をもつ上脚部(32a)と、前記取付部の下端から前記上脚部(32a)と同側に曲折して延出し前記シリンダチューブ(5b)の側面に当接可能な前記上脚部(32a)の先端と同心で前記シリンダチューブ(5b)の外周面と略同等の凹状円弧面を有する先端をもつ下脚部(32b)とを具える
ことを特徴とする産業車両のリフトシリンダ支持装置。
Industrial vehicle provided with a pair of support members (31, 32) that sandwich and support the outer surface of the cylinder tube (5b) of the lift cylinder (5) erected along the mast (1) from a substantially opposing direction. In the lift cylinder support device of
One of the support members (31) is substantially D-shaped or substantially J-shaped in plan view, and includes a semi-cylindrical portion having an inner peripheral surface slightly larger than the outer peripheral surface of the cylinder tube (5b). And an inwardly projecting contact portion (31e) capable of contacting the upper end surface of the cylinder tube (5b) without contacting the piston rod (5c),
The other support member (32) includes a mounting portion on the vehicle body side, and an outer periphery of the cylinder tube (5b) that bends and extends from the upper end of the mounting portion and can contact the side surface of the cylinder tube (5b). An upper leg (32a) having a tip having a concave arcuate surface substantially equivalent to the surface, and bends and extends from the lower end of the mounting portion to the same side as the upper leg (32a) of the cylinder tube (5b). A lower leg portion (32b) having a tip that is concentric with the tip of the upper leg portion (32a) capable of contacting a side surface and has a concave arc surface substantially equivalent to the outer peripheral surface of the cylinder tube (5b). An industrial vehicle lift cylinder support device.
JP2000193359A 2000-06-27 2000-06-27 Lift cylinder support device for industrial vehicles Expired - Fee Related JP4059369B2 (en)

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100991331B1 (en) 2005-12-28 2010-11-02 현대중공업 주식회사 Lift cylinder assembly of truck
JP2007320679A (en) * 2006-05-30 2007-12-13 Toyota Industries Corp Cylinder fixing device

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