JP4554126B2

JP4554126B2 - Support structure for work vehicle cab

Info

Publication number: JP4554126B2
Application number: JP2001280964A
Authority: JP
Inventors: 博司中上; 匠刊武田
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2001-09-17
Filing date: 2001-09-17
Publication date: 2010-09-29
Anticipated expiration: 2021-09-17
Also published as: JP2003090062A

Description

【０００１】
【発明の属する技術分野】
本発明は建設・土木工事用車両等の作業車両、特にトラクター系車両のキャブの支持構造に係わり、より具体的には、車両に対する法定の最大高さ寸法を満足する高さ寸法範囲内にキャブを配することができると共に、簡単な構造で組立性に優れたキャブの支持構造に関する。
【０００２】
【従来の技術】
従来から、トラクタショベル、ブルドーザなどの建設・土木機械等の各種の作業用車両は、車両本体の車体フレームの上面に設けられた支柱や梁などのキャブ用支持部材に運転席を有するキャブを設置している。かかる作業用車両は、キャブ用支持部材の上面とキャブのフロアプレートの下面との間に所要数のダンパを介装させることにより車両本体から伝わる振動を極力防止して、運転者の快適且つ安全な運転作業を保証するように配慮されている。
【０００３】
この種の作業用車両におけるキャブの支持構造の一例が、例えば特開２０００−３３６６９７号公報に開示されている。同公報に開示されたキャブの支持構造は、走行体上に垂直軸線回りに旋回自在に装着された上部旋回体が設けられ、同上部旋回体上にキャブ用主支持部材（キャブベッド）が設けられている。同主支持部材の上面とキャブのフロアプレートの下面との間にゴム部の弾性変形とシリコーンオイルによる減衰作用とを利用するダンパを介在させることにより車体フレームに対するキャブの防振支持がなされている。
【０００４】
前記ダンパは、シリコーンオイルが封入されたダンパ部本体と、上部が軸部材の周面に固着され、下部がダンパ部本体内に挿入されたゴム部と、同ゴム部の底部から下方へ突出する軸部材の露呈端部に連結固定された減衰盤と、前記軸部材の上部に螺合されたスタッドボルトに嵌挿して前記ゴム部の上端面に設けられたゴム変形規制用のストッパ部材とを有している。
【０００５】
この従来のキャブの支持構造は、ダンパ部本体をキャブ用主支持部材に形成された取付孔に嵌挿して、ダンパ部本体の上部に設けられたボルト挿通孔を有する取付フランジを介してキャブ用主支持部材の取付孔周辺にボルトにて締付固定する。一方、キャブのフロアプレートに形成されたボルト挿通孔に、前記ゴム部の軸部材上部に螺合されたスタッドボルトの先端部を挿通して、その先端部にナットを螺合することにより、前記ゴム部が前記主支持部材の上面と前記フロアプレートの下面との間に固着される。
【０００６】
かかる構成によれば、車体フレームの振動は、前記主支持部材を介してダンパに伝達され、同ダンパのゴム部の弾性変形がシリコンオイル内の減衰盤に作用し、その減衰効果によってキャブに伝達される振動が緩和される。
【０００７】
【発明が解決しようとする課題】
前述の特開２０００−３３６６９７号公報に開示されたキャブの支持構造によれば、油圧ショベルのようなキャブの主支持部材を設置した上部旋回体の直下部に主要な機械装置が存在しない場合には、キャブの支持位置の上下により車両の高さ寸法を所望の設定高さに配することはさして困難ではない。しかし、ブルドーザのごときトラクター系車両では、キャブの主支持部の直下にトランスミッションやトルクコンバータなどの動力伝達部が装備されるため、車両の高さ寸法をキャブの支持位置の上下により所望の設定高さに配することはできない。その結果、必然的にフロアフレームの上面に設けられたキャブ用主支持部材の下面位置を前記動力伝達部よりも高く設定する必要がある。
【０００８】
しかも、ダンパの可動部であるゴム部の突出部分は、前記主支持部材の上面とキャブのフロアプレートの下面との間であって、前記主支持部材の取付孔の中心部と同一垂直線上に上方に突出した状態で配されるため、必然的に前記フロアプレートの下面位置を前記主支持部材よりも大幅に高く設定する必要があり、キャブを前記主支持部材の上面から更に上方に突出させざる得ない。従って、車両高さは、接地面から主支持部材の上面とキャブの屋根板の上面までの高さ寸法にダンパの突出部分の高さ寸法を加えた寸法が車両の全高さ寸法となる。
【０００９】
ところで、この種の作業用車両にあっては、車両の輸送制限を定めた国内法に基づいて接地面から車両最高部、すなわち接地面からキャブの屋根部上面までの最大高さの寸法限度が規定されている。その結果、前述のごとき車両輸送時の高さ寸法を越える場合には、車両本体とキャブとを分割してトラック輸送し、建設現場にて組み立てることを余儀なくされるため、工期を大幅に遅延させることにつながる。
【００１０】
また、車両本体にキャブを組み立てる際には、既述したごとく前記主支持部材の上面にダンパ部本体が嵌挿固定された複数のダンパの各スタッドボルトを、それぞれキャブのフロアプレートの所定位置に形成されたボルト挿通孔に挿通させる必要がある。そのため、キャブ側あるいは主支持部材側からは、キャブのフロアプレート又は主支持部材が邪魔をして、前記主支持部材の上面とキャブのフロアプレートの下面との間の内部の取付部位を容易には視認できず、前記スタッドボルトの先端部と前記フロアプレートのボルト挿通孔との位置合せ作業に時間がかかり、ダンパの組付け効率を低下させる原因ともなっている。
【００１１】
また、車両の全高を、上述のごとく規制された高さを満足させようとすると、ダンパの突出部分の高さ寸法分だけキャブの屋根板の高さを低くせざるを得なくなり、ダンパの突出部分の高さ寸法が高くなることに比例してキャブの室内高さも低くなる。これがため、キャブ室内の運転作業性や居住性等が損なわれるという不具合が生じることとなる。
【００１２】
更に、従来のキャブの支持構造は、既述したごとく前記主支持部材自体にダンパを挿入する取付孔を形成するため、前記主支持部材の剛性やダンパの取付強度を確保しようとすると、材質や設計上で別途検討しなければならず、特にその支持構造の設計が煩雑となりやすい。また、ダンパの取付部位が主支持部材の投影領域に限定されることになるが、主支持部材の下方空間には、上述のごとく様々な駆動装置や、それらの配線、配管などが配備されているため、極めて自由度に乏しい。
【００１３】
本発明は、かかる従来の課題を解消すべくなされたものであり、その具体的な目的は、キャブの必要な高さを確保すると共に、国内法に基づく車両の最大高さ寸法を満足する高さ寸法の範囲内にキャブを配することを可能とし、所要の剛性や取付強度が確保された簡単な構造を有する作業車両用キャブの支持構造を提供することにある。
【００１４】
【課題を解決するための手段及び作用効果】
本件請求項１に係る発明は、作業車両用キャブの支持構造であって、車体フレームの上面に設けられた所要高さのキャブ用の主支持部材と、その一端部が前記主支持部材に支持され、前記主支持部材の側方偏位位置に形成される空間領域に延出する副支持部材と、その副支持部材の他端部に固定支持されるダンパとを備えてなり、前記副支持部材は、その一端部が前記主支持部材の上端面に片持ち状に固定支持された板材からなり、同ダンパは可動部と同可動部の下方に連設されたダンパ部本体とを有し、前記ダンパ部本体の周面に取付フランジを有してなり、前記ダンパは前記取付フランジを介して前記副支持部材の前記他端部に固定支持され、前記ダンパの前記可動部が前記キャブのフロアプレートの下面に固定支持されてなる、ことを特徴とする作業車両用キャブの支持構造にある。
【００１５】
本発明の基本的な作業車両用キャブの支持構造は、車体フレームの上面に設けられた所要高さに位置するキャブ用主支持部材の側方偏位位置であって、同主支持部材の下面からの高さの範囲にある側方の空間領域を有効に利用して、ダンパの設置空間とする。その設置空間内に、前記主支持部材に一端が固定支持されるタンパ支持用の副支持部材を延設すると共に、同副支持部材の先端側にダンパを固定支持する。
【００１６】
本発明の支持構造は、前記ダンパのダンパ部本体の中心部周辺で上下方向に微小に動く緩衝用の可動部をキャブのフロアプレートの下面にボルトや溶接等の適宜の固着手段により固定すると共に、前記可動部に連設された前記ダンパ部本体を前記主支持部材の上端面よりも下方位置となるようにして前記副支持部材に固定している。
【００１７】
従来のごとく主支持部材の上面とキャブのフロアプレートの下面との双方に対向して形成された上下一対のダンパ取付部の各中心部とダンパの軸部とを同一垂直線上に配するのではなく、少なくとも前記主支持部材の下方の側方にある限られた空間を合理的に利用するものであり、そのため前記副支持部材及び前記フロアプレートの各ダンパ取付部を主支持部材の側方に偏位するように、前記副支持部材を前記主支持部材の側方に延出させて支持すると共に、同副支持部材の先端部と同先端部に対向する前記フロアプレートの部位とに、前記ダンパの軸部の中心部を合致させて取り付ける。
【００１８】
かかる構成を採用することにより、前記主支持部材及びキャブ室内の大きさを変えることなく車両の最大高さ寸法を満足する高さ寸法範囲内で、前記副支持部材を所望の形状及び大きさで形成することができるようになり、その副支持部材の設計の自由度が増加する。前記副支持部材及び前記ダンパは、前記主支持部材の下面から上端面の間に形成された側方の空間に納めることができるため、国内法に基づく車両の最大高さ寸法を満足する高さ寸法を維持できるようになり、安全な輸送性が得られるばかりでなく、現場での組付けが不要となり、経費の面でも有利である。また同時に、前記キャブの既存の室内高さを維持することができるため、キャブ室内の優れた運転作業性や快適な居住性などを阻害することはない。
【００１９】
また、前記主支持部材の側方偏位位置に前記ダンパを前記副支持部材を介して取り付けるため、前記主支持部材と前記副支持部材との双方の取付部位が前記キャブの車体パネルに隠蔽されることなく外部に露呈されるため、容易に視認できるようになり、前記キャブの車体パネル周辺で前記ダンパ及び前記キャブの取付作業を簡単に且つ迅速に行うことができるようになる。
更にまた、前記副支持部材を介して前記主支持部材にダンパを固定支持するため、前記主支持部材にダンパ支持のための嵌挿孔を形成する必要がなくなり、前記主支持部材に通常の剛性以上の剛性も不要となり、材料費の低減及び設計上の煩雑性が回避できる。
【００２０】
請求項２に係る発明は、前記フロアプレートとフェンダとを略同一水平面上に配していることを特徴としている。
この発明は、車両に許される最大高さ寸法を越えない範囲内で、前記ダンパの取付高さを設定するとき、前記キャブのフロアシートと車体パネルの一部を構成するフェンダとの上面位置を略同一水平面上とする。前記フェンダの取付位置は前記主支持部材の直上であって、その取付高さも必然的に制限される。本発明におけるダンパの取付位置は上述のごとく設定できるため、ダンパ上部のフロアプレートと前記フェンダを略同一平面上に配することができるようになり、そこの段差を不要にする。また同時に、フェンダに対してもキャブの外形形状に見合った良好な外観意匠性が得られ、商品価値が高められる。
【００２１】
請求項３に係る発明は、前記副支持部材の先端側に前記ダンパ本体を収容支持する支持孔が形成されていることを特徴としている。
前記副支持部材及びダンパは、少なくとも主支持部材の下方であって、その側方の空間領域に納まるようにするため、上述のように主支持部材に前記副支持部材を片持ち状に固定支持すると共に、同副支持部材の先端側に支持孔を形成して、その支持孔に前記ダンパ部本体を嵌挿して支持する。こうすることで、ダンパ部本体が主支持部材の下方で且つ側方に偏位した位置に取り付けられることになる。その結果、主支持部材の上方にはダンパの可動部のみが突出するだけとなり、キャブの高さを最大限まで高くしても、車両高さを法定の最大高さ寸法を越えない範囲内に収めることが可能となる。
【００２２】
かかる構成によれば、前記主支持部材にダンパ支持用の支持孔等の加工を排除できるため、前記主支持部材に所要の剛性が得られ、前記ダンパの大きさによって前記副支持部材の端部を前記主支持部材の側方内部に嵌着固定したり、或いは前記主支持部材の上端面等に固定することができるようになる。前記主支持部材に対して前記副支持部材の取付部位を簡単な構造とすることが可能となり、しかも前記副支持部材の取付強度が確保される。
【００２３】
請求項４に係る発明は、前記副支持部材が、前記ダンパ部本体を固定支持するダンパ固定部と、同ダンパ固定部の上方に向けて屈曲して延びる屈曲部と、同屈曲部の外方に向けて屈曲して延び、前記主支持部材に固定支持される主支持部材用固定部とを有してなり、前記ダンパ固定部を前記主支持部材よりも下側に偏位させていることを特徴としている。
この発明によれば、前述のごとく屈曲した副支持部材の主支持部材用固定部を主支持部材に固定支持すると共に、前記主支持部材から階段状に下方に屈曲された前記屈曲部を介して下方に偏位させたダンパ固定部に形成された上記支持孔に前記ダンパのダンパ部本体を収容支持する。したがって、前記主支持部材の上部側方に形成されたダンパ設置空間を合理的に使用することができる。
【００２４】
また、本発明では前記副支持部材はクランク形状をなす簡単な構造で前記副支持部材の剛性を向上させている。更に、前記ダンパ固定部を前記主支持部材よりも下側に大きく偏位させることができるため、前記ダンパの可動部の作動に支障を生じさせない範囲内で、車両の最大高さ寸法をさらに低く設定できる。
【００２５】
【発明の実施の形態】
以下、本発明の好適な実施の形態を添付図面に基づいて具体的に説明する。
図１〜図４は本発明の代表的な実施形態を示している。図１は同作業用車両の車体フレームの一部を示す要部後面図、図２は同車体フレームの一部を示す要部上面図、図３は同車体フレームの上面にキャブの支持構造を備えた要部拡大断面図、図４は同キャブの支持構造の一例を示す斜視図である。なお、本実施形態にあっては、ブルドーザ用キャブの支持構造を例に挙げて説明するが、本発明はこれに限定されるものではなく、例えばダンプトラック、トラッククレーン、トラクタショベル等の建設・土木機械等の各種の作業用車両に適用できる。
【００２６】
ブルドーザにおける車両本体の車体フレームには、履体、トランスミッション、トルクコンバータや配管などの動力伝達装置及び作業装置などの車両付属設備が取り付けられている。本実施形態によれば、図示せぬ車体フレームには、同じく図示を省略した動力伝達装置等が備えられることになるため、前記車体フレームの上面には、図１〜図３に示すようにキャブ用の第１主支持部材として、車両前後左右に所要の高さをもって略門型形状をなす４本の高剛性の鋼鉄柱材１，…，１が立設されている。図示例では、車両後方左側の鋼鉄柱材１を概略的に示している。この鋼鉄柱材１は、車両の輸送制限を定めた国内法に基づいて接地面からキャブの屋根部上面までの最大高さの寸法限度が規定されているため、前記動力伝達装置等の上方にあって、その取付高さも必然的に制限される。
【００２７】
車両幅方向に対向する左右の各鋼鉄柱材１の中央部上端面には、キャブ用の第２主支持部材として各鋼鉄柱材１を連結する梁状の鋼材からなる剛性支持柱２が架設されている。同剛性支持柱２の上端面には、運転席を有するキャブ３が設置されている。このキャブ３は、車両本体の振動によって運転者の運転作業性や居住性などを損なうことがないように、キャブ３のフロアプレート３ａを前記剛性支持柱２の上端面に固定支持された複数個のダンパ４，…，４を介して取り付けられている。
【００２８】
なお、前記鋼鉄柱材１及び前記剛性支持柱２からなるキャブ用支持部材の形状や支持構造等は図示例に限定されるものではない。本発明に適用されるキャブ用支持部材は、例えば従来から広く知られた一般的な上部旋回体を構成する鋼板、他の形状や形式のものであってもよい。
【００２９】
本発明の特徴とするところは、キャブ３を防振支持するダンパ４の支持構造、設置位置及びその構成部材にある。本実施形態によれば、前記剛性支持柱２の上端面には、側方に向けて水平に直交する偏位位置であって、同剛性支持柱２の下面からの高さの範囲にある側方の空間領域を有効に利用して、ダンパ４の設置空間Ａが設けられている。
【００３０】
本実施形態に適用されるダンパ４は、図３及び図４に示すようにダンパ部本体４ａと、同ダンパ部本体４ａの中心部周辺で上下方向に微小に動く緩衝用の可動部４ｂとを備えており、同可動部４ｂに略矩形をなすキャブ用固定部材４ｂ−１を有している。このダンパ４は、弾性ゴムの弾性及び／又はシリコンオイル等の粘性抵抗などを利用する一般的な構造を有している。
【００３１】
前記ダンパ４の設置空間Ａ内には、ダンパ支持用の副支持部材として支持ブラケット５の一端が前記剛性支持柱２の上端面に片持ち状に固定支持されると共に、この支持ブラケット５の先端部が側方に向けて延設されている。同支持ブラケット５は剛性支持柱２と別体に形成された横板状の鋼板からなり、その先端部に形成された支持孔５ａには、前記ダンパ部本体４ａが剛性支持柱２の上端面よりも下方位置に偏位するように収容支持されている。
【００３２】
前記ダンパ４の取付は、そのダンパ部本体４ａに形成されたボルト挿通孔を有する取付フランジ４ｃを介して支持ブラケット５の支持孔周辺にボルトにより締付固定すると共に、前記ダンパ部本体４ａの上部に連設する可動部４ｂをキャブ３のフロアプレート３ａの下面にボルトや溶接等の適宜の固着手段にて固定している。なお、フロアプレート３ａは、ダンパ取付面と対応する部位から下方へ突出する補強部材３ｂを溶接等にて固定することによって剛性を高めている。
【００３３】
本実施形態では、少なくとも前記剛性支持柱２の下面から上端面の間に形成された側方空間領域にダンパ４を納めるようにするため、前記剛性支持柱２の上端面に支持ブラケット５を片持ち状に固定支持すると共に、同支持ブラケット５の支持孔５ａに前記ダンパ４のダンパ部本体４ａを嵌挿して支持する。その結果、前記剛性支持柱２の上方には前記ダンパ４の可動部４ｂのみが突出し、キャブ３の高さを最大限まで高くしても、車両高さを国内法に基づく車両の最大高さ寸法を満足する高さ寸法を越えない範囲内に納めている。
【００３４】
かかる構成によれば、前記支持ブラケット５及びダンパ４は、前記剛性支持柱２の下面から上端面の間に形成された側方偏位位置の空間領域に納めることができるため、国内法に基づく車両の最大高さ寸法を満足する高さ寸法を維持できるようになり、安全な輸送性が得られる。また、ダンパ４が前記剛性支持柱２の側方偏位位置に前記支持ブラケット５を介して固定支持されるため、前記剛性支持柱２と支持ブラケット５との双方の取付位置がキャブ３の車体パネルに隠蔽されることなく外部に露呈されて容易に視認できる。このため、車体パネル周辺でダンパ４及びキャブ３の双方の取付作業を簡単に且つ迅速になし得るばかりでなく、容易に剛性支持柱２から取り外すことができるようになる。
【００３５】
また更に、本実施形態によれば、従来のごとくキャブ用主支持部材の上面とキャブのフロアプレートの下面との双方に対向して形成された上下一対のダンパ取付孔の各中心部とダンパの軸部とを同一垂直線上に配しないため、キャブ用主支持部材の一部を構成する前記剛性支持柱２にダンパ支持用の支持孔を形成する必要がなく前記剛性支持柱２に通常の剛性以上の剛性も不要となり、材料費の節減及び設計上の自由度が増加する。
【００３６】
図１に示すフェンダ１ａの取付高さは、上述のように動力伝達装置等が備えられるために必然的に制限されるが、前記剛性支持柱２の側方偏位位置の空間領域にダンパ４を配することができるため、ダンパ４の取付高さを設定しようとするとき、前記キャブ３のフロアプレート３ａの下面とフェンダ１ａの上面とを略同一水平面上に配することが可能となる。このため、前記フロアプレート３ａとフェンダ１ａとの間の目障りな隙間を視認しにくくすることができるようになり、フェンダ１ａに対してもキャブ３の外形形状に見合った良好な外観意匠性が得られ、見栄えとしての商品価値が十分に高められる。
【００３７】
図５はキャブ用の副支持部材である支持ブラケットの変形例を示している。なお、同図において上記実施形態と実質的に同じ部材には同一の部材名と符号を付している。同図において、キャブのフロアプレートの下面に固定支持されるダンパ４は、ダンパ部本体４ａとその中心部に直交して側方に延在する細長い略矩形をなすキャブ用固定部材４ｂ−１を有する可動部４ｂとを備えている。
【００３８】
一方、支持ブラケット５０は前記ダンパ部本体４ａを固定支持するダンパ固定部５１と、同ダンパ固定部５１の上方に向けて屈曲して延びる屈曲部５２とを有している。同屈曲部５２の上端には、キャブ用主支持部材である上記剛性支持柱２に固定支持される主支持部材用固定部５３が外方に屈曲して延びている。前記ダンパ固定部５３の支持孔に収容支持されるダンパ４の軸部を中心に前記主支持部材用固定部５３と前記キャブ用固定部材４ｂ−１とが互いに逆方向に向けて延在している。
【００３９】
この実施形態によれば、前記支持ブラケット５０はクランク形状をなしており、簡単な構造で剛性を向上させている。更には、前記剛性支持柱２の上部側方に形成されたダンパ設置空間を合理的に使用している。図示例にあっでは、前記剛性支持柱２の上端面に前記支持ブラケット５０の主支持部材用固定部５３を固定支持すると共に、前記屈曲部５２を介して階段状に屈曲されたダンパ固定部５３の支持孔に前記ダンパ４のダンパ部本体４ａを収容支持する。
【００４０】
かかる構成を備えることにより、前記ダンパ固定部５３を前記剛性支持柱２よりも下側に大幅に偏位させることができるため、前記ダンパ４の可動部４ｂの作動に支障を生じさせない範囲内で車両の最大高さ寸法をさらに低く設定できる。
【００４１】
以上の説明からも明らかなように、本実施形態によれば、従来のごとく主支持部材の上面とキャブのフロアプレートの下面との双方に対向して形成された上下一対のダンパ取付部の各中心部とダンパの軸部とを同一垂直線上に配するのではなく、少なくとも前記剛性支持柱２の下面から上端面までの高さの範囲にある側方の空間領域を合理的に利用して、前記剛性支持柱２の側方に形成されたダンパ４の設置空間Ａ内に前記支持ブラケット５，５０の一端を固定支持すると共に、前記ダンパ部本体４ａを前記剛性支持柱２の上端面よりも下方位置に偏位させている。
【００４２】
かかる構成を備えることにより、上記動力伝達装置等の高さに影響されることなく車両の輸送制限を定めた国内法に基づく車両に許される最大高さ寸法を越えない範囲内で、車両の最大高さ寸法を合理的に維持することができる。それと同時に、前記キャブ３の既存の室内高さを維持することができるため、運転者に対して快適な室内居住性を損なうことなく運転作業の安全性などが確保される。
【００４３】
また、上述のごとく少なくとも前記剛性支持柱２の下面から上端面までの高さの範囲にある側方の空間をダンパ設定空間Ａとして有効に利用できるため、既存の主支持部材１，２及びキャブ３の大きさ等を変えることなく、前記ダンパ設定空間Ａ内において、ダンパ支持用の副支持部材である支持ブラケット５，５０を所望の形状、構造及び大きさで形成することができるようになり、支持ブラケット５，５０の設計の自由度が増加する。
【００４４】
本実施形態にあっては、例えばダンパ４の大きさによって前記剛性支持柱２の側方内部に穿設されたブラケット挿入孔に支持ブラケット５，５０の一端部を嵌挿して固定することにより片持ち状に支持することができる。このように、前記剛性支持柱２に支持ブラケット５，５０の取付部位を簡単な構造で設定することが可能となり、キャブ用の前記剛性支持柱２の剛性等を低下させることなく支持ブラケット５，５０の取付強度が確保できる。なお、本発明は上記各実施形態に限定されるものではなく、それらの実施形態から当業者が容易に変更可能な技術的範囲をも当然に包含するものである。
【図面の簡単な説明】
【図１】本発明の代表的な実施形態である作業用車両の車体フレームの一部を示す要部後面図である。
【図２】同車体フレームの上面を示す要部構造説明図である。
【図３】同車体フレームの上面にキャブの支持構造を備えた要部拡大断面図である。
【図４】同キャブの支持構造の一例を示す斜視図である。
【図５】同キャブの支持構造の変形例を示す斜視図である。
【符号の説明】
１鋼鉄柱材
１ａフェンダ
２剛性支持柱
３キャブ
３ａフロアプレート
３ｂ補強部材
４ダンパ
４ａダンパ部本体
４ｂ可動部
４ｂ−１キャブ用固定部材
４ｃ取付フランジ
５，５０支持ブラケット
５ａ支持孔
５１ダンパ固定部
５２屈曲部
５３主支持部材用固定部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab support structure for a construction vehicle, such as a construction / civil engineering vehicle, particularly a tractor vehicle, and more specifically, a cab within a height dimension range that satisfies a statutory maximum height dimension for the vehicle. Further, the present invention relates to a cab support structure that has a simple structure and excellent assemblability.
[0002]
[Prior art]
Conventionally, various work vehicles such as construction and civil engineering machines such as tractor excavators and bulldozers have cabs with a driver's seat installed on support members for cabs and beams provided on the upper surface of the body frame of the vehicle body. is doing. Such a working vehicle prevents the vibration transmitted from the vehicle body as much as possible by interposing a required number of dampers between the upper surface of the cab support member and the lower surface of the floor plate of the cab, thereby making the driver comfortable and safe. Care is taken to ensure proper operation.
[0003]
An example of a cab support structure in this type of work vehicle is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-336697. The cab support structure disclosed in the publication is provided with an upper swing body mounted on a traveling body so as to be rotatable about a vertical axis, and a cab main support member (cab bed) is provided on the upper swing body. It has been. Anti-vibration support of the cab with respect to the vehicle body frame is made by interposing a damper using elastic deformation of the rubber part and damping action by silicone oil between the upper surface of the main support member and the lower surface of the floor plate of the cab. .
[0004]
The damper protrudes downward from the damper part main body in which silicone oil is sealed, the upper part is fixed to the peripheral surface of the shaft member, the lower part is inserted into the damper part main body, and the bottom part of the rubber part. A damping plate connected and fixed to the exposed end portion of the shaft member, and a rubber deformation restricting stopper member provided on the upper end surface of the rubber portion by being inserted into a stud bolt screwed into the upper portion of the shaft member. Have.
[0005]
In this conventional cab support structure, the damper portion main body is fitted into a mounting hole formed in the cab main support member, and the cab is mounted via a mounting flange having a bolt insertion hole provided in an upper portion of the damper portion main body. Fasten and fix with bolts around the mounting hole of the main support member. On the other hand, through the bolt insertion hole formed in the floor plate of the cab, by inserting the tip end portion of the stud bolt screwed onto the shaft member upper portion of the rubber portion, and screwing the nut to the tip portion, A rubber part is fixed between the upper surface of the main support member and the lower surface of the floor plate.
[0006]
According to this configuration, the vibration of the vehicle body frame is transmitted to the damper via the main support member, and the elastic deformation of the rubber part of the damper acts on the damping plate in the silicon oil, and is transmitted to the cab by the damping effect. Vibrations that are generated are alleviated.
[0007]
[Problems to be solved by the invention]
According to the cab support structure disclosed in the aforementioned Japanese Patent Laid-Open No. 2000-336697, when there is no main mechanical device directly below the upper swing body where the cab main support member such as a hydraulic excavator is installed. It is not difficult to arrange the vehicle height dimension at a desired set height by moving the cab support position up and down. However, a tractor-type vehicle such as a bulldozer is equipped with a power transmission unit such as a transmission or a torque converter directly below the main support portion of the cab, so that the height of the vehicle can be set to a desired setting height above and below the cab support position. I can't distribute it. As a result, the lower surface position of the cab main support member provided on the upper surface of the floor frame inevitably needs to be set higher than that of the power transmission unit.
[0008]
Moreover, the protruding portion of the rubber portion, which is the movable portion of the damper, is between the upper surface of the main support member and the lower surface of the floor plate of the cab, and is on the same vertical line as the center portion of the mounting hole of the main support member. Since it is arranged in a state of protruding upward, it is inevitably necessary to set the position of the lower surface of the floor plate significantly higher than the main support member, and the cab protrudes further upward from the upper surface of the main support member. I cannot help it. Therefore, the vehicle height is the total height of the vehicle obtained by adding the height of the protruding portion of the damper to the height from the ground contact surface to the upper surface of the main support member and the upper surface of the roof plate of the cab.
[0009]
By the way, in this type of work vehicle, there is a dimensional limit of the maximum height from the ground plane to the highest part of the vehicle, that is, from the ground plane to the top of the roof of the cab, based on the domestic law that defines the vehicle transportation restrictions It is prescribed. As a result, if the height of the vehicle is exceeded, as described above, the vehicle body and the cab are separated and transported by truck, and it is forced to assemble at the construction site. It leads to things.
[0010]
Further, when the cab is assembled to the vehicle main body, as described above, the stud bolts of the plurality of dampers having the damper portion main body fitted and fixed to the upper surface of the main support member are respectively placed at predetermined positions on the floor plate of the cab. It is necessary to pass through the formed bolt insertion hole. Therefore, from the cab side or the main support member side, the floor plate of the cab or the main support member obstructs, so that an internal mounting site between the upper surface of the main support member and the lower surface of the cab floor plate can be easily formed. Cannot be visually recognized, and it takes time to align the tip end portion of the stud bolt with the bolt insertion hole of the floor plate, which causes a reduction in the assembly efficiency of the damper.
[0011]
Further, if the overall height of the vehicle is to satisfy the regulated height as described above, the height of the roof plate of the cab must be lowered by the height dimension of the protruding portion of the damper, and the protrusion of the damper In proportion to the height of the portion being increased, the cabin height of the cab is also decreased. For this reason, the malfunction that the driving | operating workability | operativity in a cab room, comfortability, etc. will be impaired will arise.
[0012]
Further, as described above, the conventional cab support structure forms a mounting hole for inserting a damper in the main support member itself, as described above, so that the rigidity of the main support member and the mounting strength of the damper can be secured. The design must be considered separately, and the design of the support structure is particularly complicated. In addition, the mounting site of the damper is limited to the projection area of the main support member. In the lower space of the main support member, as described above, various drive devices, their wiring, piping, and the like are arranged. Therefore, there is very little freedom.
[0013]
The present invention has been made to solve the conventional problems, and a specific object thereof is to secure a necessary height of the cab and to satisfy a maximum height dimension of the vehicle based on a domestic law. It is an object of the present invention to provide a cab support structure for a work vehicle that has a simple structure in which a cab can be arranged within the range of the height dimension and required rigidity and mounting strength are ensured.
[0014]
[Means for solving the problems and effects]
The invention according to claim 1 is a cab support structure for a work vehicle, the main support member for the cab having a required height provided on the upper surface of the vehicle body frame, and one end thereof supported by the main support member. A sub-support member extending to a space region formed at a laterally displaced position of the main support member, and a damper fixedly supported at the other end of the sub-support member, and the sub-support The member is made of a plate material whose one end is fixed and supported in a cantilever manner on the upper end surface of the main support member, and the damper has a movable portion and a damper portion main body continuously provided below the movable portion. The damper body has a mounting flange on the peripheral surface thereof, the damper is fixedly supported on the other end of the auxiliary support member via the mounting flange, and the movable portion of the damper is connected to the cab. formed by fixedly supported to the lower surface of the floor plate, that In the support structure of the work vehicle cab according to symptoms.
[0015]
The basic structure for supporting a cab for a work vehicle according to the present invention is a laterally shifted position of a main support member for a cab located at a required height provided on the upper surface of a body frame, and the lower surface of the main support member. The space area of the side in the range of the height from the side is effectively used as a damper installation space. A tamper-supporting sub-support member whose one end is fixedly supported on the main support member is extended in the installation space, and a damper is fixedly supported on the tip side of the sub-support member.
[0016]
The support structure of the present invention fixes a movable portion for buffering that moves slightly in the vertical direction around the center portion of the damper portion main body of the damper to the lower surface of the cab floor plate by an appropriate fixing means such as a bolt or welding. The damper portion main body connected to the movable portion is fixed to the sub-support member so as to be positioned below the upper end surface of the main support member.
[0017]
As in the prior art, the central portion of the upper and lower damper mounting portions formed opposite to both the upper surface of the main support member and the lower surface of the floor plate of the cab and the shaft portion of the damper are arranged on the same vertical line. And at least a limited space on the side of the lower side of the main support member is reasonably utilized, so that the damper support portions of the sub-support member and the floor plate are located on the side of the main support member. The sub-support member is extended to the side of the main support member so as to be displaced, and is supported on the tip portion of the sub-support member and the portion of the floor plate facing the tip portion. Install with the center of the shaft of the damper aligned.
[0018]
By adopting such a configuration, the auxiliary support member can be formed in a desired shape and size within a height dimension range that satisfies the maximum height dimension of the vehicle without changing the sizes of the main support member and the cab chamber. Thus, the degree of freedom in designing the sub-support member is increased. Since the sub-support member and the damper can be accommodated in a lateral space formed between the lower surface and the upper end surface of the main support member, the height satisfying the maximum height dimension of the vehicle based on domestic law. The dimensions can be maintained, and not only can safe transportation be achieved, but also no on-site assembly is required, which is advantageous in terms of cost. At the same time, since the existing indoor height of the cab can be maintained, excellent driving workability and comfortable living in the cab room are not hindered.
[0019]
Further, in order to attach the damper to the laterally displaced position of the main support member via the sub-support member, the attachment parts of both the main support member and the sub-support member are concealed by the vehicle body panel of the cab. Since it is exposed to the outside without being exposed, it can be easily seen, and the damper and the cab can be easily and quickly attached around the body panel of the cab.
Furthermore, since the damper is fixedly supported on the main support member via the auxiliary support member, it is not necessary to form a fitting insertion hole for supporting the damper in the main support member, and the main support member has a normal rigidity. The above-described rigidity is also unnecessary, so that material costs can be reduced and design complexity can be avoided.
[0020]
The invention according to claim 2 is characterized in that the floor plate and the fender are arranged on substantially the same horizontal plane.
In the present invention, when the mounting height of the damper is set within a range not exceeding the maximum height dimension allowed for the vehicle, the upper surface position of the floor sheet of the cab and the fender constituting a part of the vehicle body panel is determined. It shall be on substantially the same horizontal plane. The mounting position of the fender is directly above the main support member, and its mounting height is necessarily limited. Since the mounting position of the damper in the present invention can be set as described above, the floor plate above the damper and the fender can be arranged on substantially the same plane, eliminating the need for a step there. At the same time, a good appearance design suitable for the outer shape of the cab is obtained for the fender, and the commercial value is increased.
[0021]
The invention according to claim 3 is characterized in that a support hole for accommodating and supporting the damper main body is formed on the distal end side of the auxiliary support member.
The sub-support member and the damper are fixedly supported in a cantilever manner on the main support member as described above so that the sub-support member and the damper are at least below the main support member and fit in the space area on the side thereof. At the same time, a support hole is formed on the distal end side of the auxiliary support member, and the damper portion main body is inserted into and supported by the support hole. By doing so, the damper portion main body is attached to a position shifted downward and laterally of the main support member. As a result, only the movable part of the damper protrudes above the main support member, and even if the cab height is increased to the maximum, the vehicle height does not exceed the legal maximum height dimension. It can be stored.
[0022]
According to such a configuration, the main support member can be processed such as a support hole for supporting the damper, so that the main support member has a required rigidity, and the end portion of the sub-support member depends on the size of the damper. Can be fixed to the inside of the side of the main support member, or can be fixed to the upper end surface or the like of the main support member. The sub-support member can be attached to the main support member in a simple structure, and the attachment strength of the sub-support member is ensured.
[0023]
According to a fourth aspect of the present invention, the auxiliary support member includes a damper fixing portion that fixes and supports the damper portion main body, a bent portion that bends and extends upward above the damper fixing portion, and an outer side of the bent portion. A main support member fixing portion that is bent and extended toward the main support member and is fixedly supported by the main support member, and the damper fixing portion is displaced downward from the main support member. It is characterized by.
According to the present invention, the fixing portion for the main support member of the sub-support member bent as described above is fixedly supported to the main support member, and the bent portion bent downward in a stepped manner from the main support member. The damper part main body of the damper is accommodated and supported in the support hole formed in the damper fixing part displaced downward. Therefore, the damper installation space formed on the upper side of the main support member can be used reasonably.
[0024]
In the present invention, the auxiliary support member has a simple structure having a crank shape, and the rigidity of the auxiliary support member is improved. Further, since the damper fixing portion can be greatly displaced downward from the main support member, the maximum height dimension of the vehicle is further reduced within a range that does not hinder the operation of the movable portion of the damper. Can be set.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.
1 to 4 show an exemplary embodiment of the present invention. 1 is a rear view of a main part showing a part of a body frame of the working vehicle, FIG. 2 is a top view of a main part showing a part of the body frame, and FIG. 3 shows a cab support structure on the upper surface of the body frame. FIG. 4 is a perspective view showing an example of a support structure of the cab. In this embodiment, the bulldozer cab support structure will be described as an example, but the present invention is not limited to this. For example, construction and construction of a dump truck, a truck crane, a tractor excavator, etc. It can be applied to various work vehicles such as civil engineering machines.
[0026]
The vehicle body frame of the vehicle body in the bulldozer is equipped with vehicle accessories such as a shoe, a transmission, a power transmission device such as a torque converter and piping, and a work device. According to the present embodiment, the vehicle body frame (not shown) is provided with a power transmission device or the like (not shown), so that the cab is formed on the upper surface of the vehicle body frame as shown in FIGS. As the first main support member, four high-rigidity steel pillars 1,..., 1 having a substantially gate-like shape with a required height are provided on the front, rear, left and right sides of the vehicle. In the illustrated example, the steel pillar 1 on the left rear side of the vehicle is schematically shown. This steel pillar 1 has a dimensional limit of the maximum height from the ground plane to the top of the roof of the cab based on the domestic law that defines vehicle transportation restrictions. Therefore, the mounting height is inevitably limited.
[0027]
A rigid support column 2 made of a beam-shaped steel material for connecting the steel column members 1 as a second main support member for a cab is installed on the upper end surface of the central portion of each of the left and right steel column members 1 facing the vehicle width direction. Has been. A cab 3 having a driver's seat is installed on the upper end surface of the rigid support column 2. The cab 3 includes a plurality of cab 3 floor plates 3a fixedly supported on the upper end surface of the rigid support column 2 so that the driver's driving workability and comfortability are not impaired by vibration of the vehicle body. Are installed via dampers 4.
[0028]
In addition, the shape, support structure, etc. of the support member for cab which consists of the said steel pillar material 1 and the said rigid support pillar 2 are not limited to the example of illustration. The cab support member applied to the present invention may be, for example, a steel plate or other shapes and types constituting a general upper revolving body that has been widely known.
[0029]
The features of the present invention lie in the support structure, installation position, and components of the damper 4 that supports the cab 3 in a vibration-proof manner. According to the present embodiment, the upper end surface of the rigid support column 2 is located at a deviated position that is horizontally orthogonal to the side and in the range of the height from the lower surface of the rigid support column 2. The installation space A for the damper 4 is provided by effectively using the other space region.
[0030]
As shown in FIGS. 3 and 4, the damper 4 applied to the present embodiment includes a damper body 4 a and a buffering movable section 4 b that moves slightly in the vertical direction around the center of the damper body 4 a. The movable portion 4b has a cab fixing member 4b-1 having a substantially rectangular shape. The damper 4 has a general structure utilizing the elasticity of elastic rubber and / or viscous resistance such as silicon oil.
[0031]
In the installation space A of the damper 4, one end of a support bracket 5 is fixed and supported in a cantilever manner on the upper end surface of the rigid support column 2 as a sub-support member for supporting the damper, and the tip of the support bracket 5 The part is extended toward the side. The support bracket 5 is made of a horizontal plate-shaped steel plate formed separately from the rigid support column 2, and the damper body 4 a is connected to the upper end surface of the rigid support column 2 in the support hole 5 a formed at the tip of the support bracket 5. It is accommodated and supported so as to deviate to a lower position.
[0032]
The damper 4 is attached by tightening and fixing around the support hole of the support bracket 5 via a mounting flange 4c having a bolt insertion hole formed in the damper part main body 4a, and at the top of the damper part main body 4a. The movable portion 4b that is connected to the cab 3 is fixed to the lower surface of the floor plate 3a of the cab 3 by appropriate fixing means such as bolts or welding. The floor plate 3a has increased rigidity by fixing a reinforcing member 3b protruding downward from a portion corresponding to the damper mounting surface by welding or the like.
[0033]
In the present embodiment, the support bracket 5 is placed on the upper end surface of the rigid support column 2 so that the damper 4 is accommodated in at least a side space region formed between the lower surface and the upper end surface of the rigid support column 2. In addition to being fixedly supported in a holding shape, the damper portion main body 4a of the damper 4 is inserted into the support hole 5a of the support bracket 5 and supported. As a result, only the movable portion 4b of the damper 4 protrudes above the rigid support column 2, and even if the height of the cab 3 is increased to the maximum, the vehicle height is the maximum height of the vehicle based on the domestic law. It is within the range that does not exceed the height that satisfies the dimensions.
[0034]
According to such a configuration, the support bracket 5 and the damper 4 can be accommodated in a space region of a laterally displaced position formed between the lower surface and the upper end surface of the rigid support column 2, and thus is based on a domestic law. The height dimension that satisfies the maximum height dimension of the vehicle can be maintained, and safe transportability can be obtained. Further, since the damper 4 is fixedly supported at the laterally displaced position of the rigid support column 2 via the support bracket 5, the mounting position of both the rigid support column 2 and the support bracket 5 is the vehicle body of the cab 3. Without being concealed by the panel, it is exposed to the outside and easily visible. For this reason, not only the mounting operation of both the damper 4 and the cab 3 can be easily and quickly performed around the vehicle body panel, but also can be easily detached from the rigid support column 2.
[0035]
Furthermore, according to the present embodiment, as in the prior art, each center portion of a pair of upper and lower damper mounting holes formed opposite to both the upper surface of the main support member for cab and the lower surface of the floor plate of the cab, and the damper Since the shaft portion is not arranged on the same vertical line, it is not necessary to form a support hole for damper support in the rigid support column 2 constituting a part of the main support member for cab, and the rigid support column 2 has a normal rigidity. The above-described rigidity is also unnecessary, and the material cost is reduced and the degree of freedom in design increases.
[0036]
The mounting height of the fender 1a shown in FIG. 1 is inevitably limited because the power transmission device and the like are provided as described above, but the damper 4 is provided in the space region of the lateral displacement position of the rigid support column 2. Therefore, when setting the mounting height of the damper 4, it is possible to arrange the lower surface of the floor plate 3a of the cab 3 and the upper surface of the fender 1a on substantially the same horizontal plane. For this reason, it becomes possible to make it difficult to visually recognize the annoying gap between the floor plate 3a and the fender 1a, and a good appearance design corresponding to the outer shape of the cab 3 can be obtained with respect to the fender 1a. And the product value as a good appearance is sufficiently enhanced.
[0037]
FIG. 5 shows a modification of the support bracket which is a sub-support member for the cab. In addition, the same member name and code | symbol are attached | subjected to the member substantially the same as the said embodiment in the same figure. In the figure, a damper 4 fixedly supported on the lower surface of a cab floor plate includes a damper portion main body 4a and a cab fixing member 4b-1 that is formed in a substantially rectangular shape extending sideways perpendicular to the central portion thereof. And a movable portion 4b.
[0038]
On the other hand, the support bracket 50 includes a damper fixing portion 51 that fixes and supports the damper portion main body 4a, and a bent portion 52 that bends and extends upward above the damper fixing portion 51. At the upper end of the bent portion 52, a main support member fixing portion 53 fixed to and supported by the rigid support column 2 as a cab main support member is bent outward and extended. The main support member fixing portion 53 and the cab fixing member 4b-1 extend in opposite directions around the shaft portion of the damper 4 housed and supported in the support hole of the damper fixing portion 53. Yes.
[0039]
According to this embodiment, the support bracket 50 has a crank shape, and the rigidity is improved with a simple structure. Furthermore, the damper installation space formed in the upper side of the said rigid support pillar 2 is rationally used. In the illustrated example, the main support member fixing portion 53 of the support bracket 50 is fixedly supported on the upper end surface of the rigid support column 2, and the damper fixing portion 53 is bent stepwise via the bent portion 52. The damper part main body 4a of the damper 4 is accommodated and supported in the support hole.
[0040]
By providing such a configuration, the damper fixing portion 53 can be greatly displaced below the rigid support column 2, so that the operation of the movable portion 4 b of the damper 4 is not disturbed. The maximum height of the vehicle can be set even lower.
[0041]
As is clear from the above description, according to the present embodiment, each of the pair of upper and lower damper mounting portions formed to face both the upper surface of the main support member and the lower surface of the floor plate of the cab as in the prior art. Rather than arranging the central part and the shaft part of the damper on the same vertical line, at least a lateral space region in the range from the lower surface to the upper end surface of the rigid support column 2 is used rationally. In addition, one end of the support brackets 5 and 50 is fixedly supported in an installation space A of the damper 4 formed on the side of the rigid support column 2, and the damper portion main body 4 a is supported from the upper end surface of the rigid support column 2. Is also biased downward.
[0042]
By providing such a configuration, the maximum height of the vehicle is within a range not exceeding the maximum height dimension permitted for the vehicle based on the domestic law that defines the vehicle transportation restrictions without being affected by the height of the power transmission device and the like. The height dimension can be reasonably maintained. At the same time, since the existing indoor height of the cab 3 can be maintained, the safety of the driving work is ensured without impairing the comfortable indoor comfort for the driver.
[0043]
Further, as described above, at least the side space in the range from the lower surface to the upper end surface of the rigid support column 2 can be effectively used as the damper setting space A, so that the existing main support members 1 and 2 and the cab can be used. In the damper setting space A, the support brackets 5 and 50, which are auxiliary support members for supporting the damper, can be formed in a desired shape, structure and size without changing the size of the damper 3 and the like. The degree of freedom in designing the support brackets 5 and 50 increases.
[0044]
In the present embodiment, for example, one end portion of the support brackets 5 and 50 is inserted and fixed in a bracket insertion hole drilled inside the side of the rigid support pillar 2 depending on the size of the damper 4. It can be supported like a hand. Thus, it becomes possible to set the attachment part of the support brackets 5 and 50 to the rigid support column 2 with a simple structure, and the support brackets 5 and 5 can be set without reducing the rigidity of the rigid support column 2 for cab. A mounting strength of 50 can be secured. In addition, this invention is not limited to said each embodiment, Of course, the technical range which those skilled in the art can change easily from those embodiments is also included.
[Brief description of the drawings]
FIG. 1 is a main part rear view showing a part of a body frame of a working vehicle according to a representative embodiment of the present invention.
FIG. 2 is an explanatory diagram of a main part structure showing an upper surface of the vehicle body frame.
FIG. 3 is an enlarged cross-sectional view of a main part provided with a cab support structure on an upper surface of the vehicle body frame.
FIG. 4 is a perspective view showing an example of a support structure of the cab.
FIG. 5 is a perspective view showing a modified example of the support structure of the cab.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel pillar 1a Fender 2 Rigid support pillar 3 Cab 3a Floor plate 3b Reinforcement member 4 Damper 4a Damper part main body 4b Movable part 4b-1 Fixing member 4c for cab Mounting flange 5,50 Support bracket 5a Support hole 51 Damper fixing part 52 Bending part 53 Main support member fixing part

Claims

A support structure for the work vehicle cab (3),
A main support member (2) for a cab having a required height provided on the upper surface of the body frame, and one end portion thereof are supported by the main support member (2), and a lateral displacement of the main support member (2) A sub-support member (5) extending in a space region formed at a position, and a damper (4) fixedly supported at the other end of the sub-support member (5),
The sub-support member (5) is composed of a plate whose one end is fixedly supported in a cantilever manner on the upper end surface of the main support member (2),
The damper (4) has a movable part (4b) and a damper part main body (4a) continuously provided below the movable part (4b), and a mounting flange is provided on a peripheral surface of the damper part main body (4a). (4c)
The damper (4) is fixedly supported on the other end of the auxiliary support member (5) via the mounting flange (4c),
A cab support structure for a work vehicle , wherein the movable portion (4b) of the damper (4) is fixedly supported on a lower surface of a floor plate (3a) of the cab (3) .

The cab support structure according to claim 1, wherein the floor plate (3a) and the fender (1a) are arranged on substantially the same horizontal plane.

The support structure for a cab according to claim 1 or 2, wherein a support hole (5a) for accommodating and supporting the damper main body (4a) is formed at a distal end side of the sub-support member (5).

The sub-support member (5) includes a damper fixing portion (51) for fixing and supporting the damper portion main body (4a), and a bent portion (52) extending and bent upward from the damper fixing portion (51). A bent portion (52) extending outwardly of the bent portion (52) and having a main support member fixing portion (53) fixedly supported by the main support member (2),
The cab support structure according to any one of claims 1 to 3, wherein the damper fixing portion (51) is displaced downward from the main support member (2).