JP5781295B2 - Construction machinery - Google Patents

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JP5781295B2
JP5781295B2 JP2010257669A JP2010257669A JP5781295B2 JP 5781295 B2 JP5781295 B2 JP 5781295B2 JP 2010257669 A JP2010257669 A JP 2010257669A JP 2010257669 A JP2010257669 A JP 2010257669A JP 5781295 B2 JP5781295 B2 JP 5781295B2
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deck
cab
shaped
plate
shaped member
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JP2012107435A (en
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真史 入江
真史 入江
京子 増田
京子 増田
木下　伸一
伸一 木下
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Kobe Steel Ltd
Kobelco Cranes Co Ltd
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Kobe Steel Ltd
Kobelco Cranes Co Ltd
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Description

本発明は、クレーンなどの建設機械に関し、特に、建設機械のキャブ（運転室）の振動およびキャブ内の騒音を低減するための構造に関するものである。   The present invention relates to a construction machine such as a crane, and more particularly to a structure for reducing vibration of a cab (cab) of a construction machine and noise in the cab.

この種の技術に関しては、例えば特許文献１〜３に記載されたものがある。特許文献１には、キャブの床板の下面全体に遮音材を取り付けるとともに、車体フレームの底面に多孔のアンダーカバーを取り付けた建設機械が記載されている。また、特許文献２に記載された建設機械では、キャブ下側のスペースをエンジン室に冷却風を導入するための通路として使用し、その通路の内面に吸音材を取り付けたり、通路に枝菅を取り付けてサイドブランチ型共鳴を利用したりして、エンジン室からの騒音を低減させている。また、特許文献３では、遮音材を取り付けた遮音室をキャブの周囲に設けて、キャブ内へ直接騒音が侵入することを防止している。   With regard to this type of technology, for example, there are those described in Patent Documents 1 to 3. Patent Document 1 describes a construction machine in which a sound insulating material is attached to the entire bottom surface of a cab floor plate and a porous under cover is attached to the bottom surface of a vehicle body frame. In the construction machine described in Patent Document 2, the space below the cab is used as a passage for introducing cooling air into the engine room, and a sound absorbing material is attached to the inner surface of the passage, or a branch is attached to the passage. The noise from the engine compartment is reduced by installing side branch type resonance. Moreover, in patent document 3, the sound insulation chamber which attached the sound insulation material is provided in the circumference | surroundings of a cab, and it prevents that a noise penetrate | invades directly into a cab.

実公平３−５５６５４号公報Japanese Utility Model Publication 3-55654 特開２００８−１５５７９０号公報JP 2008-155790 A 特開２０００−３５５９５５号公報JP 2000-355955 A

特許文献１〜３に記載された技術には、それぞれ下記のような問題点がある。特許文献１に記載された技術では、キャブ下からキャブ内への騒音の伝播を、キャブ床板の下面全体に取り付けた遮音材で抑制している。一方、建設機械の操作用配管などの開口や空調用の開口がキャブ床板に設けられている場合がある。この場合、キャブ床板の下面に遮音材を取り付けていたとしても、これらの開口からキャブ内へ騒音が侵入してくる。また、特許文献１に記載された遮音材には、コインシデンス効果によって遮音効果が低下する周波数帯域があり、加振力の周波数がその周波数帯域と重なる場合、キャブ内での騒音が低下しない可能性がある。   The techniques described in Patent Documents 1 to 3 have the following problems, respectively. In the technique described in Patent Document 1, the propagation of noise from under the cab into the cab is suppressed by a sound insulating material attached to the entire lower surface of the cab floor board. On the other hand, there are cases where openings such as operation pipes for construction machines and openings for air conditioning are provided in the cab floor board. In this case, even if a sound insulating material is attached to the lower surface of the cab floor plate, noise enters from the opening into the cab. In addition, the sound insulating material described in Patent Document 1 has a frequency band in which the sound insulating effect is reduced due to the coincidence effect. When the frequency of the excitation force overlaps with the frequency band, the noise in the cab may not be reduced. There is.

また、特許文献２に記載されているような吸音材は、低周波数帯域の騒音に対しては吸音効果が小さい。サイドブランチ型の共鳴菅は、対象とする周波数の音以外には基本的に消音効果が小さい。複数の周波数の音を低減しなければならない場合、複数の共鳴菅を設けなければならず、この場合、共鳴菅の設置場所を確保しにくい。また、特許文献２に記載された技術では、エンジン室などから伝播してくる振動によるキャブの振動を低減することはできない。   Further, the sound absorbing material described in Patent Document 2 has a small sound absorbing effect with respect to noise in a low frequency band. The side-branch type resonator basically has a small silencing effect other than the sound of the target frequency. When it is necessary to reduce the sound of a plurality of frequencies, a plurality of resonance rods must be provided. In this case, it is difficult to secure a place for installing the resonance rods. Further, the technique described in Patent Document 2 cannot reduce the vibration of the cab due to the vibration propagating from the engine room or the like.

特許文献３に記載されているようなキャブの周囲に設けた遮音室では、高圧の油圧配管などがキャブ後方からキャブ下まで伸ばされ、その配管が遮音室の内部を通る場合、油圧配管の支持部を遮音室内に設ける必要性がでてくる。特許文献３では、遮音室およびキャブ自体に特別な振動低減対策が施されていないため、油圧配管を伝わってきた振動が配管支持部からキャブ床下の部材へ伝わり、キャブ床下の部材を振動させることによる振動・騒音が発生することとなる。また、キャブ背後やキャブ下側から冷却風を導入してエンジン室内の冷却を行う場合、遮音室を設けることで冷却風の通路面積が小さくなるため冷却風の風量不足となる可能性もある。   In the sound insulation chamber provided around the cab as described in Patent Document 3, when the high-pressure hydraulic piping is extended from the rear of the cab to the bottom of the cab, and the piping passes through the interior of the sound insulation chamber, the hydraulic piping is supported. It is necessary to provide the part in the sound insulation chamber. In Patent Document 3, since no special vibration reduction measures are taken for the sound insulation chamber and the cab itself, the vibration transmitted through the hydraulic pipe is transmitted from the pipe support to the member under the cab floor, and the member under the cab floor is vibrated. Vibration and noise will be generated. Further, when cooling the engine room by introducing cooling air from behind the cab or the lower side of the cab, the passage area of the cooling air is reduced by providing the sound insulation chamber, so there is a possibility that the air volume of the cooling air is insufficient.

本発明は、上記実情に鑑みてなされたものであって、その目的は、キャブの後方にエンジン室が配置されている建設機械において、キャブ下からキャブ内へ伝播する振動・騒音をともに低減することができるキャブの構造を提供することである。   The present invention has been made in view of the above circumstances, and an object thereof is to reduce both vibration and noise propagating from under the cab into the cab in a construction machine in which an engine room is arranged behind the cab. It is to provide a cab structure that can.

本発明は、下部走行体の上に上部旋回体が搭載されてなる建設機械において、前記上部旋回体は、前部に設けられたキャブと、当該キャブの背後に設けられたエンジン室と、当該キャブと当該エンジン室とを搭載する内部に空間を有するデッキと、を有し、Ｃ形または四角形の断面を有する角形部材が前記キャブの床板の下面に固定されて、前記デッキの内部空間に当該角形部材が左右方向に配置されていることを特徴とする建設機械である。   The present invention relates to a construction machine in which an upper swing body is mounted on a lower traveling body, and the upper swing body includes a cab provided at a front portion, an engine chamber provided behind the cab, A deck having a space in which the cab and the engine room are mounted, and a square member having a C-shaped or quadrangular cross section is fixed to the lower surface of the floor plate of the cab, and the deck has an internal space. The construction machine is characterized in that the square members are arranged in the left-right direction.

この構成によると、Ｃ形または四角形の断面を有する角形部材がキャブの床板の下面に固定されることで、キャブの床板の剛性が高まり、その結果、当該床板が振動しにくくなる。また、キャブの床板の下面に固定された角形部材とデッキの底板との間の上下方向の空間は、キャブの床板とデッキの底板との間の上下方向の空間よりも狭くなる。すなわち、角形部材がある場所とない場所とで、デッキ内部の容積が変化し、デッキ内部で膨張型消音器構造が形成されることによる減音効果が得られる。   According to this configuration, the square member having a C-shaped or quadrangular cross section is fixed to the lower surface of the floor plate of the cab, thereby increasing the rigidity of the floor plate of the cab, and as a result, the floor plate is less likely to vibrate. Further, the vertical space between the square member fixed to the lower surface of the cab floor plate and the bottom plate of the deck is narrower than the vertical space between the cab floor plate and the deck bottom plate. That is, the volume inside the deck changes between where the square member is present and where the square member is not present, and a sound reduction effect can be obtained by forming the expansion silencer structure inside the deck.

すなわち、Ｃ形または四角形の断面を有する角形部材をキャブの床板の下面に固定することで、キャブ床板の剛性向上および膨張型の減音効果が得られ、キャブ下からキャブ内へ伝播する振動・騒音をともに低減することができる。その結果、キャブの振動およびキャブ内の騒音は低減する。なお、デッキ内部で膨張型の減音効果が得られることで、キャブ下から建設機械の周囲に放射される騒音も低減する。   That is, by fixing a square member having a C-shaped or quadrangular cross section to the lower surface of the cab floor plate, the rigidity of the cab floor plate can be improved and an expansion type sound reduction effect can be obtained. Both noises can be reduced. As a result, the vibration of the cab and the noise in the cab are reduced. In addition, the noise radiated from under the cab to the surroundings of the construction machine can be reduced by providing an expansion type sound reduction effect inside the deck.

また本発明において、複数の前記角形部材が前記床板の下面に前記デッキの前後方向に間隔をあけて固定されており、隣り合う前記角形部材の間隔が、すべて異なる間隔とされるとともに、それぞれの間隔の比が倍数比とならないようにされていることが好ましい。   Further, in the present invention, a plurality of the square members are fixed to the lower surface of the floor board at intervals in the front-rear direction of the deck, and the intervals between the adjacent square members are all different, It is preferable that the interval ratio not be a multiple ratio.

膨張型の減音は、膨張部の長さで減音される周波数が決まる。この構成によると、複数の周波数の音を低減することができる。換言すれば、減音効果が低下する周波数帯域を減らすことができ、その結果、騒音がより低減する。   In the expansion type sound reduction, the frequency to be reduced is determined by the length of the expansion portion. According to this configuration, it is possible to reduce sounds having a plurality of frequencies. In other words, the frequency band where the sound reduction effect is reduced can be reduced, and as a result, noise is further reduced.

さらに本発明において、前記角形部材は、Ｃ形の断面を有するＣ形部材であって、前記デッキの前方向または後方向に開口が向けられた状態で、前記デッキの前後方向に間隔をあけて、複数の前記Ｃ形部材が前記床板の下面に固定されており、一方の前記Ｃ形部材の背面板部から、隣り合う他方の前記Ｃ形部材の開口の内部まで、前記デッキの前後方向に沿って板部材が延在されており、前記Ｃ形部材の背面板部の上下方向中間位置よりも下側に前記板部材が配置されていることが好ましい。   Further, in the present invention, the square member is a C-shaped member having a C-shaped cross section, and is spaced in the front-rear direction of the deck in a state where the opening is directed to the front direction or the rear direction of the deck. The plurality of C-shaped members are fixed to the lower surface of the floor plate, and extend from the back plate portion of one of the C-shaped members to the inside of the opening of the other adjacent C-shaped member in the front-rear direction of the deck. It is preferable that the plate member is extended along, and the said plate member is arrange | positioned below the up-down direction intermediate position of the back plate part of the said C-shaped member.

この構成によると、上記した板部材が遮音板となり、キャブ下（デッキ内）に侵入してきた騒音が、キャブの床下から直接、キャブ内へと侵入することを防止できる。また、Ｃ形部材の背面板部の上下方向中間位置よりも下側に板部材を配置することで、キャブ内へ伝わる騒音をより効果的に低減することができる。   According to this configuration, the plate member described above serves as a sound insulating plate, and noise that has entered the cab (inside the deck) can be prevented from entering the cab directly from under the cab floor. Moreover, the noise transmitted into the cab can be more effectively reduced by disposing the plate member below the intermediate position in the vertical direction of the back plate portion of the C-shaped member.

さらに本発明において、前記角形部材は、Ｃ形の断面を有するＣ形部材であって、前記Ｃ形部材の開口を形成する部分の端に鍔板が設けられており、上方向に開口が向けられた状態で、前記Ｃ形部材が前記床板の下面に鍔板を介して固定されていることが好ましい。   Further, in the present invention, the square member is a C-shaped member having a C-shaped cross section, and a saddle plate is provided at an end of a portion forming the opening of the C-shaped member, and the opening is directed upward. In this state, it is preferable that the C-shaped member is fixed to the lower surface of the floor board via a gutter.

この構成によると、キャブの床板の剛性をさらに高めることができ、結果として、キャブの振動はより低減する。   According to this configuration, the rigidity of the cab floor can be further increased, and as a result, the vibration of the cab is further reduced.

さらに本発明において、前記角形部材の下方であって前記デッキの底板の上面に、Ｃ形または四角形の断面を有する第２角形部材が、前記デッキの前後方向については前記角形部材の位置に合わせて固定されて、前記角形部材とともに当該第２角形部材が前記デッキの内部空間に配置されていることが好ましい。   Further, in the present invention, a second square member having a C-shaped or quadrangular cross section is provided below the square member and on the upper surface of the bottom plate of the deck, so that the longitudinal direction of the deck is aligned with the position of the square member. It is preferable that the second square member is disposed in the internal space of the deck together with the square member.

この構成によると、第２角形部材によりデッキの底板の剛性が高まり、当該底板が振動しにくくなるとともに、デッキ内部の容積変化が大きくなり、膨張型の減音効果も向上する。その結果、キャブ内へ伝わる騒音およびキャブ下から建設機械の周囲に放射される騒音がより低減する。   According to this configuration, the rigidity of the bottom plate of the deck is increased by the second rectangular member, the bottom plate is less likely to vibrate, the volume change inside the deck is increased, and the expansion type sound reduction effect is improved. As a result, noise transmitted into the cab and noise radiated from under the cab to the surroundings of the construction machine are further reduced.

さらに本発明において、前記第２角形部材は、Ｃ形の断面を有する第２Ｃ形部材であって、前記デッキの前方向または後方向に開口が向けられた状態で、複数の前記第２Ｃ形部材が前記デッキの底板の上面に固定されており、一方の前記第２Ｃ形部材の背面板部から、隣り合う他方の前記第２Ｃ形部材の開口の内部まで、前記デッキの前後方向に沿って第２板部材が延在されており、前記第２Ｃ形部材の背面板部の上下方向中間位置よりも上側に前記第２板部材が配置されていることが好ましい。   Further, in the present invention, the second rectangular member is a second C-shaped member having a C-shaped cross section, and a plurality of the second C-shaped members in a state where the opening is directed in the front direction or the rear direction of the deck. Is fixed to the upper surface of the bottom plate of the deck, and from the back plate portion of one of the second C-shaped members to the inside of the opening of the other adjacent second C-shaped member along the front-rear direction of the deck. Preferably, the two plate members are extended, and the second plate member is disposed above the intermediate position in the vertical direction of the back plate portion of the second C-shaped member.

この構成によると、第２板部材が遮音板となり、キャブ下（デッキ内）に侵入してきた騒音が、デッキ外部へ漏れることを防止できる。また、第２Ｃ形部材の背面板部の上下方向中間位置よりも上側に第２板部材を配置することで、デッキ外部へ漏れる騒音をより効果的に低減することができる。その結果、キャブ下から建設機械の周囲に放射される騒音がより低減する。   According to this configuration, the second plate member serves as a sound insulating plate, and noise that has entered the cab (inside the deck) can be prevented from leaking outside the deck. Moreover, the noise which leaks outside a deck can be more effectively reduced by arrange | positioning a 2nd board member above the up-down direction intermediate position of the backplate part of a 2C-shaped member. As a result, noise radiated from under the cab around the construction machine is further reduced.

さらに本発明において、前記第２角形部材は、Ｃ形の断面を有する第２Ｃ形部材であって、前記第２Ｃ形部材の開口を形成する部分の端に鍔板が設けられており、下方向に開口が向けられた状態で、前記第２Ｃ形部材が前記デッキの底板の上面に鍔板を介して固定されていることが好ましい。   Further, in the present invention, the second rectangular member is a second C-shaped member having a C-shaped cross section, and a saddle plate is provided at an end of a portion forming the opening of the second C-shaped member, and the downward direction It is preferable that the second C-shaped member is fixed to the upper surface of the bottom plate of the deck through a gutter plate with the opening directed to the top.

この構成によると、第２Ｃ形部材によりデッキの底板の剛性がより高まり、当該底板がより振動しにくくなる。   According to this configuration, the rigidity of the bottom plate of the deck is further increased by the second C-shaped member, and the bottom plate is more difficult to vibrate.

本発明によれば、本発明の構成要件、特に、Ｃ形または四角形の断面を有する角形部材をキャブの床板の下面に固定することで、キャブ下からキャブ内へ伝播する振動・騒音をともに低減することができる。その結果、キャブの振動およびキャブ内の騒音は低減する。   According to the present invention, both the vibration and noise propagating from under the cab into the cab are reduced by fixing the constituent elements of the present invention, in particular, a square member having a C-shaped or quadrangular cross section to the lower surface of the cab floor. can do. As a result, the vibration of the cab and the noise in the cab are reduced.

本発明の第１実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 3rd Embodiment of this invention. 本発明の第４実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 4th Embodiment of this invention. 本発明の第５実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 5th Embodiment of this invention. 本発明の第６実施形態に係る建設機械のキャブ下の構造を示す図である。It is a figure which shows the structure under the cab of the construction machine which concerns on 6th Embodiment of this invention. Ｃ形部材がある場合とない場合とでキャブ床板の振動レベルを比較した結果を示すグラフである。It is a graph which shows the result of having compared the vibration level of a cab floor board with the case where there is a C-shaped member and the case where it does not exist. キャブの床下空間からキャブ床板へ伝わる騒音レベルを比較した結果を示すグラフである。It is a graph which shows the result of having compared the noise level transmitted from the under floor space of a cab to a cab floor board. Ｃ形部材の背面板部に固定する板部材の位置を変化させた場合の、キャブの床下空間からキャブ床板へ伝わる騒音レベルを比較した結果を示すグラフである。It is a graph which shows the result of having compared the noise level transmitted to the cab floor board from the under floor space of a cab at the time of changing the position of the board member fixed to the backplate part of a C-shaped member.

以下、本発明を実施するための形態について図面を参照しつつ説明する。なお、本発明に係るキャブ下の構造は、クレーンを含め様々な建設機械に適用することができるものである。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The structure under the cab according to the present invention can be applied to various construction machines including cranes.

（第１実施形態）
本発明の第１実施形態に係る建設機械のキャブ下の構造について、図１を参照しつつ説明する。図１には、建設機械の下部走行体の上に搭載される上部旋回体１の一部を示している。なお、下部走行体とは、建設機械を走行させるためのものであって、クローラ式、ホイール式などの走行体がある。図１（ａ）は、側面図であり、図１（ｂ）は、図１（ａ）のＡ−Ａ断面図である。 (First embodiment)
The structure under the cab of the construction machine according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a part of the upper swing body 1 mounted on the lower traveling body of the construction machine. The lower traveling body is for traveling a construction machine, and there are traveling bodies such as a crawler type and a wheel type. Fig.1 (a) is a side view, FIG.1 (b) is AA sectional drawing of Fig.1 (a).

ここで、上部旋回体１は、その前部に設けられ座席７を収容するキャブ２と、キャブ２の後方に設けられたエンジン室３と、を具備してなり、キャブ２の下には、操作系ロッド１１、油圧配管２１、バルブ２２（油圧配管用）などを収容するデッキ４が設けられる。図示を省略するが、例えば、上部旋回体１には、ブームが起伏自在に取り付けられる。   Here, the upper swing body 1 includes a cab 2 that is provided at a front portion thereof and accommodates a seat 7, and an engine room 3 that is provided at the rear of the cab 2. A deck 4 that houses the operation system rod 11, the hydraulic piping 21, the valve 22 (for hydraulic piping) and the like is provided. Although illustration is omitted, for example, a boom is attached to the upper swing body 1 so as to be raised and lowered.

操作系ロッド１１は、エンジン室３からデッキ４内を経由して、キャブ２内へ通される。キャブ２の床板２ａには配管カバー１１ａが取り付けられている。例えば、この部分から、デッキ４内からキャブ２内へ操作系ロッド１１が立ち上げられる。ここで、デッキ４内に収容されているバルブ２２および油圧配管２１の支持部から油圧による振動が床板２ａに伝わる。また、エンジン室３内のエンジン１０の振動が床板２ａに伝わり、床板２ａが振動する。   The operation system rod 11 is passed from the engine chamber 3 into the cab 2 through the deck 4. A piping cover 11 a is attached to the floor plate 2 a of the cab 2. For example, the operation system rod 11 is raised from the inside of the deck 4 into the cab 2 from this portion. Here, hydraulic vibration is transmitted to the floor plate 2 a from the valve 22 and the support portion of the hydraulic pipe 21 accommodated in the deck 4. Further, the vibration of the engine 10 in the engine room 3 is transmitted to the floor board 2a, and the floor board 2a vibrates.

キャブ２の床板２ａには開口部２ｂが設けられている。この開口部２ｂは、例えばケーブルなどを通すためのものである。エンジン１０の騒音、油圧配管の騒音などが、開口部２ｂからキャブ２内へ侵入してくる。   The floor 2a of the cab 2 is provided with an opening 2b. The opening 2b is for passing a cable or the like, for example. The noise of the engine 10, the noise of the hydraulic piping, etc. enter the cab 2 from the opening 2b.

キャブ２の後方に設けられたエンジン室３には、エンジン１０およびラジエータ９が収容されている。エンジン１０冷却用の空気は、キャブ２の背後側面に設けられた吸気口８から導入される。なお、後述するデッキ４の前面板４ｃにスリットなどの孔（開口）を設けて、この前面板４ｃからエンジン１０冷却用の空気をデッキ４内を通してエンジン室３に導入してもよい。   An engine chamber 3 provided behind the cab 2 accommodates an engine 10 and a radiator 9. Air for cooling the engine 10 is introduced from an intake port 8 provided on the back side surface of the cab 2. In addition, a hole (opening) such as a slit may be provided in the front plate 4c of the deck 4 to be described later, and air for cooling the engine 10 may be introduced from the front plate 4c into the engine chamber 3 through the deck 4.

デッキ４は、底板４ｂ、側面板４ａ、前面板４ｃ、および背面板（不図示）からなる。デッキ４とキャブ２とは、キャブ２の床板２ａで区画されている。前面板４ｃは、鉛直方向に対して傾斜しているが、これに限られることはない。   The deck 4 includes a bottom plate 4b, a side plate 4a, a front plate 4c, and a back plate (not shown). The deck 4 and the cab 2 are partitioned by the floor plate 2 a of the cab 2. The front plate 4c is inclined with respect to the vertical direction, but is not limited thereto.

（Ｃ形部材）
ここで、キャブ２の床板２ａの下面には、金属製の複数のＣ形部材５が固定されて、デッキ４の内部空間にＣ形部材５が配置されている。Ｃ形部材５は、長尺の部材であって、背面板部５ｃと、背面板部５ｃの両側の側面板部５ａ・５ｂとからなるコ字状の部材である。Ｃ形部材５の材料としては、炭素鋼、ステンレス鋼などが挙げられる。３枚の板材を溶接などで結合させてＣ形部材５としてもよいし、チャンネル（溝形鋼）をＣ形部材５として用いることもできる。（後述する第２Ｃ形部材６についても同様） (C-shaped member)
Here, a plurality of metal C-shaped members 5 are fixed to the lower surface of the floor plate 2 a of the cab 2, and the C-shaped members 5 are arranged in the internal space of the deck 4. The C-shaped member 5 is a long member, and is a U-shaped member including a back plate portion 5c and side plate portions 5a and 5b on both sides of the back plate portion 5c. Examples of the material of the C-shaped member 5 include carbon steel and stainless steel. Three plate members may be joined together by welding or the like to form the C-shaped member 5, or a channel (grooved steel) may be used as the C-shaped member 5. (The same applies to the second C-shaped member 6 described later)

Ｃ形部材５は、その長手方向をデッキ４の幅方向に対して平行となるようにして床板２ａの下面に固定されている。デッキ４の前側から数えて２列目・３列目のＣ形部材５の長手方向の両端は、それぞれ、デッキ４の側面板４ａに当接されて固定されている。１列目のＣ形部材５の長さは、配管カバー１１ａの位置を避けるために、２列目・３列目のＣ形部材５の長さよりも短くされている。Ｃ形部材５の開口Ｓは、いずれもデッキ４の前方向に向けられている。なお、Ｃ形部材５の開口Ｓをデッキ４の後方向に向けてもよい。   The C-shaped member 5 is fixed to the lower surface of the floor plate 2 a so that its longitudinal direction is parallel to the width direction of the deck 4. Both ends in the longitudinal direction of the C-shaped members 5 in the second and third rows counted from the front side of the deck 4 are fixed in contact with the side plates 4 a of the deck 4. The length of the C-shaped member 5 in the first row is shorter than the length of the C-shaped members 5 in the second and third rows in order to avoid the position of the piping cover 11a. The openings S of the C-shaped member 5 are all directed in the front direction of the deck 4. Note that the opening S of the C-shaped member 5 may be directed to the rear side of the deck 4.

本実施形態では、デッキ４の前後方向に間隔をあけて３つのＣ形部材５がキャブ２の床板２ａの下面に固定されている。隣り合うＣ形部材５同士の間隔を、デッキ４の前側から順に、Ｌ１、Ｌ２とすると、Ｌ１＝Ｌ２とされている。   In the present embodiment, three C-shaped members 5 are fixed to the lower surface of the floor plate 2 a of the cab 2 with an interval in the front-rear direction of the deck 4. When the interval between adjacent C-shaped members 5 is L1 and L2 in order from the front side of the deck 4, L1 = L2.

（第２Ｃ形部材）
また、キャブ２の下方に位置する部分のデッキ４の底板４ｂの上面には、金属製の複数の第２Ｃ形部材６が固定されて、複数のＣ形部材５とともに複数の第２Ｃ形部材６がデッキ４の内部空間に配置されている。第２Ｃ形部材６は、長尺の部材であって、背面板部６ｃと、背面板部６ｃの両側の側面板部６ａ・６ｂとからなるコ字状の部材である。第２Ｃ形部材６の材料としては、炭素鋼、ステンレス鋼などが挙げられる。 (2C type member)
A plurality of second C-shaped members 6 made of metal are fixed to the upper surface of the bottom plate 4 b of the deck 4 at a portion below the cab 2, and a plurality of second C-shaped members 6 together with the plurality of C-shaped members 5 are fixed. Are arranged in the internal space of the deck 4. The second C-shaped member 6 is a long member, and is a U-shaped member including a back plate portion 6c and side plate portions 6a and 6b on both sides of the back plate portion 6c. Examples of the material of the second C-shaped member 6 include carbon steel and stainless steel.

第２Ｃ形部材６は、その長手方向をデッキ４の幅方向に対して平行となるようにして底板４ｂの上面に固定されている。第２Ｃ形部材６の長手方向の両端は、それぞれ、デッキ４の側面板４ａに当接されて固定されている。また、デッキ４の前後方向における位置に関しては、上方のＣ形部材５の位置に合わせて第２Ｃ形部材６は配置されている。第２Ｃ形部材６の開口Ｓは、デッキ４の前方向に向けられている。なお、第２Ｃ形部材６の開口Ｓをデッキ４の後方向に向けてもよい。本実施形態では、デッキ４の前後方向に間隔をあけて３つの第２Ｃ形部材６がデッキ４の底板４ｂの上面に固定されている。   The second C-shaped member 6 is fixed to the upper surface of the bottom plate 4 b so that its longitudinal direction is parallel to the width direction of the deck 4. Both ends in the longitudinal direction of the second C-shaped member 6 are in contact with and fixed to the side plates 4 a of the deck 4. In addition, regarding the position of the deck 4 in the front-rear direction, the second C-shaped member 6 is arranged in accordance with the position of the upper C-shaped member 5. The opening S of the second C-shaped member 6 is directed in the front direction of the deck 4. Note that the opening S of the second C-shaped member 6 may be directed to the rear side of the deck 4. In the present embodiment, three second C-shaped members 6 are fixed to the upper surface of the bottom plate 4 b of the deck 4 with an interval in the front-rear direction of the deck 4.

また、上下に配置されたＣ形部材５と第２Ｃ形部材６とは、１列目のＣ形部材５を除いて、同じ形状・寸法の部材とされている。なお、上下において対となっているＣ形部材５の寸法と第２Ｃ形部材６の寸法とが異なっていてもよい。例えば、第２Ｃ形部材６よりもＣ形部材５を大きくしてもよい。また、Ｃ形部材５および第２Ｃ形部材６の断面形状は、いずれもＣ形であるが、これら部材のうち少なくともいずれかの断面形状が四角形であってもよい。また、第２Ｃ形部材６は、必ずしも必要な部材ではなく、Ｃ形部材５のみが設けられていてもよい。さらには、Ｃ形部材５は１つのみであってもよい。   Further, the C-shaped member 5 and the second C-shaped member 6 arranged above and below are members having the same shape and dimensions except for the C-shaped member 5 in the first row. In addition, the dimension of the C-shaped member 5 and the dimension of the 2nd C-shaped member 6 which are paired up and down may differ. For example, the C-shaped member 5 may be larger than the second C-shaped member 6. Further, the cross-sectional shapes of the C-shaped member 5 and the second C-shaped member 6 are both C-shaped, but at least one of these members may have a rectangular cross-sectional shape. Further, the second C-shaped member 6 is not necessarily a necessary member, and only the C-shaped member 5 may be provided. Furthermore, there may be only one C-shaped member 5.

（作用・効果）
本発明によると、Ｃ形部材５がキャブ２の床板２ａの下面に固定されていることで、キャブ２の床板２ａの剛性が高まり、その結果、床板２ａが振動しにくくなる。また、デッキ４内部におけるＣ形部材５と第２Ｃ形部材６との間の上下方向の空間は、キャブの床板２ａとデッキ４の底板４ｂとの間の上下方向の空間よりも狭くなる。すなわち、Ｃ形部材５および第２Ｃ形部材６がある場所とない場所とで、デッキ４内部の容積が変化し、デッキ４内部で膨張型の減音効果が得られる。 (Action / Effect)
According to the present invention, since the C-shaped member 5 is fixed to the lower surface of the floor plate 2a of the cab 2, the rigidity of the floor plate 2a of the cab 2 is increased, and as a result, the floor plate 2a is less likely to vibrate. Further, the vertical space between the C-shaped member 5 and the second C-shaped member 6 inside the deck 4 is narrower than the vertical space between the floor plate 2 a of the cab and the bottom plate 4 b of the deck 4. That is, the volume inside the deck 4 changes depending on where the C-shaped member 5 and the second C-shaped member 6 are present, and an expansion type sound reduction effect is obtained inside the deck 4.

このように、Ｃ形部材５をキャブ２の床板２ａの下面に固定することで、キャブ床板２ａの剛性向上および膨張型の減音効果が得られ、油圧配管２１・バルブ２２やエンジン１０などの振動が床板２ａに伝わって床板２ａが振動することを抑えることができるとともに、油圧配管２１・バルブ２２やエンジン１０などのキャブ下からの騒音を膨張型の減音効果により低減することができる。その結果、キャブ２の振動およびキャブ２内の騒音は低減する。   Thus, by fixing the C-shaped member 5 to the lower surface of the floor plate 2a of the cab 2, the rigidity of the cab floor plate 2a can be improved and an expansion-type noise reduction effect can be obtained, and the hydraulic piping 21, the valve 22, the engine 10, etc. It is possible to suppress the vibration from being transmitted to the floor plate 2a and to suppress the vibration of the floor plate 2a, and it is possible to reduce noise from under the cab of the hydraulic pipe 21, the valve 22, the engine 10, and the like by the expansion type sound reduction effect. As a result, the vibration of the cab 2 and the noise in the cab 2 are reduced.

なお、Ｃ形部材５と第２Ｃ形部材６との間の上下方向の間隔（第２Ｃ形部材６を設けない場合には、Ｃ形部材５と底板４ｂとの間の上下方向の間隔）に対する、床板２ａと底板４ｂとの間の上下方向の間隔の比（膨張比）は、２．５以上であることが好ましい。   Note that the vertical distance between the C-shaped member 5 and the second C-shaped member 6 (the vertical distance between the C-shaped member 5 and the bottom plate 4b when the second C-shaped member 6 is not provided). The ratio of the vertical spacing between the floor plate 2a and the bottom plate 4b (expansion ratio) is preferably 2.5 or more.

また、第２Ｃ形部材６によりデッキ４の底板４ｂの剛性が高まり、底板４ｂが振動しにくくなる。加えて、Ｃ形部材５および第２Ｃ形部材６によりデッキ内部で膨張型の減音効果が得られることで、キャブ下から建設機械の周囲に放射される騒音も低減する。   Further, the second C-shaped member 6 increases the rigidity of the bottom plate 4b of the deck 4, and the bottom plate 4b is less likely to vibrate. In addition, the C-shaped member 5 and the second C-shaped member 6 provide an expansion-type sound reduction effect inside the deck, so that noise radiated from under the cab around the construction machine is also reduced.

（第２実施形態）
次に、図２を参照しつつ、第２実施形態に係るキャブ下の構造について説明する。図２は、第２実施形態に係る上部旋回体１０２の一部を示す側面図である。第１実施形態との相違点について以下説明する。 (Second Embodiment)
Next, the structure under the cab according to the second embodiment will be described with reference to FIG. FIG. 2 is a side view showing a part of the upper swing body 102 according to the second embodiment. Differences from the first embodiment will be described below.

デッキ４の前後方向に間隔をあけて複数のＣ形部材５および第２Ｃ形部材６が、それぞれ、キャブ２の床板２ａの下面およびデッキ４の底板４ｂの上面に固定されている点は、第１実施形態と第２実施形態とで共通する。第２実施形態では、隣り合うＣ形部材５同士の間隔および隣り合う第２Ｃ形部材６同士の間隔を、デッキ４の前側から順に、Ｌ１、Ｌ２とすると、Ｌ１＞Ｌ２とされ、かつ、Ｌ１とＬ２との比が倍数比とならないようにされている。なお、倍数比とならない比でＬ１＜Ｌ２としてもよい。   A plurality of C-shaped members 5 and second C-shaped members 6 are fixed to the lower surface of the floor plate 2a of the cab 2 and the upper surface of the bottom plate 4b of the deck 4 with a space in the front-rear direction of the deck 4, respectively. Common to the first embodiment and the second embodiment. In the second embodiment, assuming that the distance between adjacent C-shaped members 5 and the distance between adjacent second C-shaped members 6 are L1 and L2 in order from the front side of the deck 4, L1> L2 and L1 The ratio between L2 and L2 is not set to be a multiple ratio. In addition, it is good also as L1 <L2 by the ratio which does not become a multiple ratio.

ここで、膨張型の減音は、膨張部の長さ（Ｌ１、Ｌ２）で減音される周波数が決まる。本実施形態によると、複数の周波数の音を低減することができる。換言すれば、減音効果が低下する周波数帯域を減らすことができ、その結果、騒音をより低減させることができる。なお、Ｌ１、Ｌ２を、それぞれ、騒音低減対象であるエンジン１０・油圧ポンプ・油圧配管などの音の１／４波長の長さとすることで、減音効果をより向上させることができる。   Here, in the expansion type sound reduction, the frequency to be reduced is determined by the length (L1, L2) of the expansion portion. According to the present embodiment, it is possible to reduce sound having a plurality of frequencies. In other words, the frequency band in which the sound reduction effect is reduced can be reduced, and as a result, noise can be further reduced. It should be noted that the sound reduction effect can be further improved by setting L1 and L2 to be ¼ wavelength lengths of noise from the engine 10, hydraulic pump, hydraulic piping, and the like, which are noise reduction targets.

（第３実施形態）
次に、図３を参照しつつ、第３実施形態に係るキャブ下の構造について説明する。図３は、第３実施形態に係る上部旋回体１０３の一部を示す側面図である。第１実施形態との相違点について以下説明する。 (Third embodiment)
Next, the structure under the cab according to the third embodiment will be described with reference to FIG. FIG. 3 is a side view showing a part of the upper swing body 103 according to the third embodiment. Differences from the first embodiment will be described below.

本実施形態では、隣り合うＣ形部材の間に板部材（１２、１３）を配置している。具体的には、１列目のＣ形部材５の背面板部５ｃから、隣り合う２列目のＣ形部材５の開口の内部まで、板部材１２を延在させている。この板部材１２は、水平方向においては、キャブ２の床板２ａに対して平行とされ、上下方向においては、Ｃ形部材５の背面板部５ｃの上下方向中間位置よりも下側に配置されている。２列目のＣ形部材５と３列目のＣ形部材５との間の板部材１２についても同様である。   In this embodiment, the plate members (12, 13) are disposed between adjacent C-shaped members. Specifically, the plate member 12 extends from the back plate portion 5c of the C-shaped member 5 in the first row to the inside of the opening of the C-shaped member 5 in the adjacent second row. The plate member 12 is parallel to the floor plate 2a of the cab 2 in the horizontal direction, and is disposed below the intermediate position in the vertical direction of the back plate portion 5c of the C-shaped member 5 in the vertical direction. Yes. The same applies to the plate member 12 between the C-shaped member 5 in the second row and the C-shaped member 5 in the third row.

同様に、１列目の第２Ｃ形部材６の背面板部６ｃから、隣り合う２列目の第２Ｃ形部材６の開口の内部まで、第２板部材１３を延在させている。この第２板部材１３は、水平方向においては、デッキ４の底板４ｂに対して平行とされ、上下方向においては、第２Ｃ形部材６の背面板部６ｃの上下方向中間位置よりも上側に配置されている。２列目の第２Ｃ形部材６と３列目の第２Ｃ形部材６との間の第２板部材１３についても同様である。   Similarly, the second plate member 13 extends from the back plate portion 6c of the second C-shaped member 6 in the first row to the inside of the opening of the second C-shaped member 6 in the adjacent second row. The second plate member 13 is parallel to the bottom plate 4b of the deck 4 in the horizontal direction, and is arranged above the intermediate position in the vertical direction of the back plate portion 6c of the second C-shaped member 6 in the vertical direction. Has been. The same applies to the second plate member 13 between the second C-shaped member 6 in the second row and the second C-shaped member 6 in the third row.

本実施形態によると、板部材１２が遮音板となり、エンジン室３などからキャブ下（デッキ４内）に侵入してきた騒音が、キャブ２の床下から直接、キャブ内へと侵入することを防止できる。また、Ｃ形部材５の背面板部５ｃの上下方向中間位置よりも下側に板部材１２を配置することで、キャブ内へ伝わる騒音をより効果的に低減することができる。   According to the present embodiment, the plate member 12 serves as a sound insulating plate, and noise that has entered the cab (inside the deck 4) from the engine room 3 or the like can be prevented from entering the cab directly from the bottom of the cab 2. . Further, by disposing the plate member 12 below the intermediate position in the vertical direction of the back plate portion 5c of the C-shaped member 5, noise transmitted to the cab can be more effectively reduced.

また、板部材１２と同様に第２板部材１３も遮音板となり、この第２板部材１３は、キャブ下（デッキ４内）に侵入してきた騒音が、デッキ外部へ漏れることを防止する。第２Ｃ形部材６の背面板部６ｃの上下方向中間位置よりも上側に第２板部材１３を配置することで、デッキ外部へ漏れる騒音をより効果的に低減することができる。   Similarly to the plate member 12, the second plate member 13 also serves as a sound insulating plate, and this second plate member 13 prevents noise that has entered under the cab (inside the deck 4) from leaking outside the deck. By disposing the second plate member 13 above the intermediate position in the vertical direction of the back plate portion 6c of the second C-shaped member 6, noise leaking outside the deck can be more effectively reduced.

なお、一方のＣ形部材５の背面板部５ｃに板部材１２を取り付け、隣り合う他方のＣ形部材５には板部材１２を接触させていないのは、隣り合うＣ形部材５間の振動伝達を回避するためである（第２板部材１３についても同様）。   In addition, the plate member 12 is attached to the back plate portion 5c of one C-shaped member 5 and the plate member 12 is not in contact with the other adjacent C-shaped member 5 because of vibration between adjacent C-shaped members 5. This is to avoid transmission (the same applies to the second plate member 13).

（第４実施形態）
次に、図４を参照しつつ、第４実施形態に係るキャブ下の構造について説明する。図４は、第４実施形態に係る上部旋回体１０４の一部を示す側面図である。第１実施形態との相違点について以下説明する。 (Fourth embodiment)
Next, the structure under the cab according to the fourth embodiment will be described with reference to FIG. FIG. 4 is a side view showing a part of the upper swing body 104 according to the fourth embodiment. Differences from the first embodiment will be described below.

本実施形態では、Ｃ形部材５の開口Ｓを形成する部分の端に鍔板１４を取り付けて、キャブ２の床板２ａの下面に固定する部材を、ハット形の部材としている。具体的には、Ｃ形部材５を構成する側面板部５ａ・５ｂの開口Ｓ側の端に鍔板１４を取り付けて、Ｃ形部材５と２つの鍔板１４とで全体としてハット形の部材としている。そしてこのハット形の部材を、その開口Ｓを上方向に向けて床板２ａの下面に鍔板１４を介して固定している。   In the present embodiment, the hat-shaped member is a member that is fixed to the lower surface of the floor plate 2a of the cab 2 by attaching the roof plate 14 to the end of the portion of the C-shaped member 5 where the opening S is formed. Specifically, a hat plate 14 is attached to the ends of the side plate portions 5a and 5b constituting the C-shaped member 5 on the opening S side, and the C-shaped member 5 and the two rib plates 14 as a whole are hat-shaped members. It is said. And this hat-shaped member is being fixed to the lower surface of the floor board 2a via the girder board 14 with the opening S facing upward.

第２Ｃ形部材６についても同様であり、第２Ｃ形部材６の開口を形成する部分の端に鍔板を取り付けて、その開口Ｓを下方向に向けてデッキ４の底板４ｂの上面に当該第２Ｃ形部材６を鍔板を介して固定している。   The same applies to the second C-shaped member 6, and a saddle plate is attached to the end of the portion forming the opening of the second C-shaped member 6, and the opening S is directed downward on the upper surface of the bottom plate 4 b of the deck 4. The 2C-shaped member 6 is fixed via a saddle plate.

本実施形態によると、第１実施形態におけるＣ形部材５（第２Ｃ形部材６）の配置（開口Ｓがデッキ４の前後方向に向いている）に比べて、キャブ２の床板２ａ（デッキ４の底板４ｂ）の剛性をさらに高めることができ、キャブ２（デッキ４）の振動をより低減することができる。なお、膨張型の減音効果も同時に得られる。   According to this embodiment, compared to the arrangement of the C-shaped member 5 (second C-shaped member 6) in the first embodiment (the opening S faces the front-rear direction of the deck 4), the floor board 2a of the cab 2 (deck 4). The rigidity of the bottom plate 4b) can be further increased, and the vibration of the cab 2 (deck 4) can be further reduced. An expansion type sound reduction effect can be obtained at the same time.

（第５実施形態）
次に、図５を参照しつつ、第５実施形態に係るキャブ下の構造について説明する。図５は、第５実施形態に係る上部旋回体１０５の一部を示す側面図である。第１実施形態との相違点について以下説明する。 (Fifth embodiment)
Next, the structure under the cab according to the fifth embodiment will be described with reference to FIG. FIG. 5 is a side view showing a part of the upper swing body 105 according to the fifth embodiment. Differences from the first embodiment will be described below.

本実施形態では、Ｃ形部材５を構成する一方の側面板部５ｂの開口側の端に補強板１５を取り付けている。そして、Ｃ形部材５の開口を下方向に向けてＣ形部材５を床板２ａの下面に固定し、Ｃ形部材５を構成する他方の側面板部５ａと、隣り合うＣ形部材５との間に緩衝材１６を入れている。なお、側面板部５ｂと補強板１５とを一体形成してもよい。すなわち、板材を曲げ加工することにより補強板１５部（曲げ部分）を設けてもよい。緩衝材１６は、例えばウレタン製のゴムマットである。なお、図５に示したように、第２Ｃ形部材６についても同様の補強がなされているともに、緩衝材１６が設けられている。   In the present embodiment, the reinforcing plate 15 is attached to the end on the opening side of one side plate portion 5b constituting the C-shaped member 5. Then, the C-shaped member 5 is fixed to the lower surface of the floor plate 2a with the opening of the C-shaped member 5 facing downward, and the other side plate portion 5a constituting the C-shaped member 5 and the adjacent C-shaped member 5 A cushioning material 16 is interposed therebetween. The side plate portion 5b and the reinforcing plate 15 may be integrally formed. That is, the reinforcing plate 15 (bending portion) may be provided by bending the plate material. The buffer material 16 is, for example, a urethane rubber mat. As shown in FIG. 5, the second C-shaped member 6 is similarly reinforced and provided with a cushioning material 16.

本実施形態によると、Ｃ形部材５の側面板部５ｂに補強板１５を取り付けることで（または、Ｃ形部材５の側面板部５ｂの端に曲げ部分を設けることで）、Ｃ形部材５、ひいてはキャブ２の床板２ａの剛性をさらに高めることができ、キャブ２の振動をより低減することができる。また、床板２ａの剛性を高めるために、デッキ４の前後方向におけるＣ形部材５の長さを長くしたとき、隣接するＣ形部材５の間に緩衝材１６を入れることで、Ｃ形部材５間の振動伝達を低減することができ、その結果、キャブ２の振動をより低減することができる。   According to the present embodiment, by attaching the reinforcing plate 15 to the side plate portion 5b of the C-shaped member 5 (or by providing a bent portion at the end of the side plate portion 5b of the C-shaped member 5), the C-shaped member 5 As a result, the rigidity of the floor 2a of the cab 2 can be further increased, and the vibration of the cab 2 can be further reduced. Further, when the length of the C-shaped member 5 in the front-rear direction of the deck 4 is increased in order to increase the rigidity of the floor plate 2 a, the cushioning material 16 is inserted between the adjacent C-shaped members 5, thereby the C-shaped member 5. The vibration transmission between the cab 2 and the cab 2 can be further reduced.

なお、第２Ｃ形部材６の一方の側面板部に補強板を取り付けるともに、第２Ｃ形部材６の他方の側面板部と、隣り合う第２Ｃ形部材６のとの間に緩衝材を入れることによる効果も、上記と同様である。   A reinforcing plate is attached to one side plate portion of the second C-shaped member 6, and a cushioning material is inserted between the other side plate portion of the second C-shaped member 6 and the adjacent second C-shaped member 6. The effect of is also the same as described above.

（第６実施形態）
次に、図６を参照しつつ、第６実施形態に係るキャブ下の構造について説明する。図６は、第６実施形態に係る上部旋回体１０６の一部を示す側面図である。第５実施形態との相違点について以下説明する。 (Sixth embodiment)
Next, the structure under the cab according to the sixth embodiment will be described with reference to FIG. FIG. 6 is a side view showing a part of the upper swing body 106 according to the sixth embodiment. Differences from the fifth embodiment will be described below.

本実施形態では、補強板１５の端から背面板部５ｃに向けて、さらなる補強板１７を取り付けている。補強板１７と背面板部５ｃとは、補強板１７の端に設けた鍔板１８を介して固定されている。なお、側面板部５ｂ、補強板１５、補強板１７、および鍔板１８を一体形成してもよい。すなわち、板材を曲げ加工することにより、補強板１５部、補強板１７部、および鍔板１８部を設けてもよい。なお、図６に示したように、第２Ｃ形部材６についても同様の補強がなされている   In the present embodiment, a further reinforcing plate 17 is attached from the end of the reinforcing plate 15 toward the back plate portion 5c. The reinforcing plate 17 and the back plate portion 5 c are fixed via a flange plate 18 provided at the end of the reinforcing plate 17. Note that the side plate portion 5b, the reinforcing plate 15, the reinforcing plate 17, and the flange plate 18 may be integrally formed. That is, the reinforcing plate 15 part, the reinforcing plate 17 part, and the flange plate 18 part may be provided by bending the plate material. As shown in FIG. 6, the same reinforcement is made for the second C-shaped member 6.

本実施形態によると、キャブ２の床板２ａおよびデッキ４の底板４ｂの剛性をさらに高めることができる。   According to the present embodiment, the rigidity of the floor plate 2a of the cab 2 and the bottom plate 4b of the deck 4 can be further increased.

（効果検証結果）
図７は、キャブ２の床板２ａの下面にＣ形部材５を設けた場合と、設けなかった場合とで、床板２ａの振動レベルを数値解析により比較した結果を示すグラフである。図７からわかるように、キャブ２の床板２ａの下面にＣ形部材５を設けた場合、設けなかった場合と比較して、床板２ａの振動レベルが全体的に小さくなっている。また、振動レベルのほとんどのピーク値が小さくなっている。 (Effectiveness verification results)
FIG. 7 is a graph showing a result of comparing the vibration level of the floor board 2a by numerical analysis when the C-shaped member 5 is provided on the lower surface of the floor board 2a of the cab 2 and when it is not provided. As can be seen from FIG. 7, when the C-shaped member 5 is provided on the lower surface of the floor plate 2 a of the cab 2, the vibration level of the floor plate 2 a is generally smaller than when the C-shaped member 5 is not provided. Moreover, most of the peak values of the vibration level are small.

図８は、キャブ２の床下空間（デッキ４内）からキャブ床板２ａへ伝わる騒音レベルを数値解析により比較した結果を示すグラフである。Ｃａｓｅ１は、Ｃ形部材を設けなかった場合である。Ｃａｓｅ２は、３つのＣ形部材５および第２Ｃ形部材６を、それぞれ等間隔に設けた場合である。Ｃａｓｅ３は、３つのＣ形部材５および第２Ｃ形部材６を、それぞれ不等間隔に設けた場合である。図８からわかるように、Ｃａｓｅ２およびＣａｓｅ３では、Ｃａｓｅ１に比べて、騒音レベルが８ｄＢ程度、低下している。Ｃａｓｅ２とＣａｓｅ３とでは、Ｃａｓｅ３のほうが騒音レベル低下量は大である。   FIG. 8 is a graph showing the result of a numerical analysis comparing the noise level transmitted from the space under the cab 2 (inside the deck 4) to the cab floor plate 2a. Case 1 is a case where no C-shaped member is provided. Case 2 is a case where the three C-shaped members 5 and the second C-shaped members 6 are provided at equal intervals. Case 3 is a case where the three C-shaped members 5 and the second C-shaped members 6 are provided at unequal intervals. As can be seen from FIG. 8, in Case 2 and Case 3, the noise level is reduced by about 8 dB compared to Case 1. In Case 2 and Case 3, the noise level reduction amount is larger in Case 3.

図９は、Ｃ形部材５の背面板部５ｃに固定する板部材１２の位置を上下方向に変化させた場合の、キャブ２の床下空間（デッキ４内）からキャブ床板２ａへ伝わる騒音レベルを数値解析により比較した結果を示すグラフである。図９からわかるように、Ｃ形部材５の背面板部５ｃの上下方向中間位置よりも下側に板部材１２を配置したほうが、騒音レベルが１０ｄＢ程度、低下している。   FIG. 9 shows the noise level transmitted from the space under the cab 2 (inside the deck 4) to the cab floor plate 2a when the position of the plate member 12 fixed to the back plate portion 5c of the C-shaped member 5 is changed in the vertical direction. It is a graph which shows the result compared by numerical analysis. As can be seen from FIG. 9, the noise level is reduced by about 10 dB when the plate member 12 is disposed below the intermediate position in the vertical direction of the back plate portion 5 c of the C-shaped member 5.

以上、本発明の実施形態について説明したが、本発明は上述の実施の形態に限られるものではなく、特許請求の範囲に記載した限りにおいて様々に変更して実施することが可能なものである。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. .

１：上部旋回体
２：キャブ
２ａ：床板
３：エンジン室
４：デッキ
５：Ｃ形部材
６：第２Ｃ形部材
７：座席
８：吸気口
９：ラジエータ
１０：エンジン
１１：操作系ロッド
１１ａ：配管カバー
２１：油圧配管
２２：バルブ
２ｂ：開口部 1: Upper swing body 2: Cab 2a: Floor board 3: Engine room 4: Deck 5: C-shaped member 6: Second C-shaped member 7: Seat 8: Inlet 9: Radiator 10: Engine 11: Operating rod 11a: Piping Cover 21: Hydraulic piping 22: Valve 2b: Opening

Claims (7)

下部走行体の上に上部旋回体が搭載されてなる建設機械において、
前記上部旋回体は、前部に設けられたキャブと、当該キャブの後方に設けられたエンジン室と、当該キャブと当該エンジン室とを搭載する内部に空間を有するデッキと、を有し、
Ｃ形または四角形の断面を有する角形部材が前記キャブの床板の下面に固定されて、前記デッキの内部空間に当該角形部材が左右方向に配置されており、
前記内部空間における前記角形部材の下の空間と、前記デッキの前後方向において当該空間の前後に位置する空間とが連通しており、且つ、
前記内部空間における前記角形部材の下の空間の高さは、前記デッキの前後方向において当該空間の前後に位置する空間の最高高さよりも低いことを特徴とする、建設機械。 In a construction machine in which an upper turning body is mounted on a lower traveling body,
The upper swing body has a cab provided at the front, an engine room provided at the rear of the cab, and a deck having a space in which the cab and the engine room are mounted.
A square member having a C-shaped or quadrangular cross section is fixed to the lower surface of the floor plate of the cab, and the square member is arranged in the left-right direction in the internal space of the deck,
The space below the square member in the internal space communicates with the space located in front of and behind the space in the front-rear direction of the deck, and
The construction machine according to claim 1, wherein a height of the space below the square member in the internal space is lower than a maximum height of a space located in front of and behind the space in the front-rear direction of the deck . 請求項１に記載の建設機械において、
複数の前記角形部材が前記床板の下面に前記デッキの前後方向に間隔をあけて固定されており、
隣り合う前記角形部材の間隔が、すべて異なる間隔とされるとともに、それぞれの間隔の比が倍数比とならないようにされていることを特徴とする、建設機械。 The construction machine according to claim 1,
A plurality of the square members are fixed to the lower surface of the floor board at intervals in the front-rear direction of the deck,
The construction machine is characterized in that the intervals between the adjacent square members are all different intervals, and the ratio of the intervals is not a multiple ratio. 請求項１に記載の建設機械において、
前記角形部材は、Ｃ形の断面を有するＣ形部材であって、
前記デッキの前方向または後方向に開口が向けられた状態で、前記デッキの前後方向に間隔をあけて、複数の前記Ｃ形部材が前記床板の下面に固定されており、
一方の前記Ｃ形部材の背面板部から、隣り合う他方の前記Ｃ形部材の開口の内部まで、前記デッキの前後方向に沿って板部材が延在されており、
前記Ｃ形部材の背面板部の上下方向中間位置よりも下側に前記板部材が配置されていることを特徴とする、建設機械。 The construction machine according to claim 1 ,
The square member is a C-shaped member having a C-shaped cross section,
A plurality of the C-shaped members are fixed to the lower surface of the floor board with an interval in the front-rear direction of the deck with the opening directed in the front direction or the rear direction of the deck,
A plate member extends along the front-rear direction of the deck from the back plate portion of one of the C-shaped members to the inside of the opening of the other adjacent C-shaped member,
A construction machine, wherein the plate member is disposed below an intermediate position in a vertical direction of a back plate portion of the C-shaped member. 請求項１または２に記載の建設機械において、
前記角形部材は、Ｃ形の断面を有するＣ形部材であって、
前記Ｃ形部材の開口を形成する部分の端に鍔板が設けられており、
上方向に開口が向けられた状態で、前記Ｃ形部材が前記床板の下面に鍔板を介して固定されていることを特徴とする、建設機械。 The construction machine according to claim 1 or 2,
The square member is a C-shaped member having a C-shaped cross section,
A saddle plate is provided at the end of the portion forming the opening of the C-shaped member,
A construction machine, wherein the C-shaped member is fixed to a lower surface of the floor board through a gutter with an opening directed upward. 請求項１〜４のいずれかに記載の建設機械において、
前記角形部材の下方であって前記デッキの底板の上面に、Ｃ形または四角形の断面を有する第２角形部材が、前記デッキの前後方向については前記角形部材の位置に合わせて固定されて、前記角形部材とともに当該第２角形部材が前記デッキの内部空間に配置されていることを特徴とする、建設機械。 In the construction machine in any one of Claims 1-4,
A second square member having a C-shaped or quadrangular cross section is fixed below the square member on the top surface of the bottom plate of the deck according to the position of the square member in the front-rear direction of the deck, and The construction machine, wherein the second square member is arranged in the internal space of the deck together with the square member. 請求項５に記載の建設機械において、
前記第２角形部材は、Ｃ形の断面を有する第２Ｃ形部材であって、
前記デッキの前方向または後方向に開口が向けられた状態で、複数の前記第２Ｃ形部材が前記デッキの底板の上面に固定されており、
一方の前記第２Ｃ形部材の背面板部から、隣り合う他方の前記第２Ｃ形部材の開口の内部まで、前記デッキの前後方向に沿って第２板部材が延在されており、
前記第２Ｃ形部材の背面板部の上下方向中間位置よりも上側に前記第２板部材が配置されていることを特徴とする、建設機械。 The construction machine according to claim 5,
The second square member is a second C-shaped member having a C-shaped cross section,
A plurality of the second C-shaped members are fixed to the upper surface of the bottom plate of the deck, with the opening directed in the front direction or the rear direction of the deck,
The second plate member extends along the front-rear direction of the deck from the back plate portion of one of the second C-shaped members to the inside of the opening of the other adjacent second C-shaped member,
The construction machine, wherein the second plate member is disposed above an intermediate position in the vertical direction of the back plate portion of the second C-shaped member. 請求項５に記載の建設機械において、
前記第２角形部材は、Ｃ形の断面を有する第２Ｃ形部材であって、
前記第２Ｃ形部材の開口を形成する部分の端に鍔板が設けられており、
下方向に開口が向けられた状態で、前記第２Ｃ形部材が前記デッキの底板の上面に鍔板を介して固定されていることを特徴とする、建設機械。 The construction machine according to claim 5,
The second square member is a second C-shaped member having a C-shaped cross section,
A saddle plate is provided at the end of the portion forming the opening of the second C-shaped member,
The construction machine, wherein the second C-shaped member is fixed to the upper surface of the bottom plate of the deck through a gutter plate with the opening directed downward.
JP2010257669A 2010-11-18 2010-11-18 Construction machinery Expired - Fee Related JP5781295B2 (en)

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