JP5065968B2 - Column support member and construction machine cab - Google Patents

Column support member and construction machine cab Download PDF

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JP5065968B2
JP5065968B2 JP2008093869A JP2008093869A JP5065968B2 JP 5065968 B2 JP5065968 B2 JP 5065968B2 JP 2008093869 A JP2008093869 A JP 2008093869A JP 2008093869 A JP2008093869 A JP 2008093869A JP 5065968 B2 JP5065968 B2 JP 5065968B2
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column
support member
cab
column support
members
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JP2009241899A (en
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晴秀 名村
敬広 野口
宏章 田中
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Komatsu Ltd
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Description

本発明は、柱支持部材およびそれを有する建設機械用キャブに関し、特に、一対の柱部材の下部間を支持する柱支持部材およびそれを有する建設機械用キャブに関する。   The present invention relates to a column support member and a cab for a construction machine having the column support member, and more particularly to a column support member for supporting a lower portion of a pair of column members and a cab for a construction machine having the column support member.

近年、建設機械におけるキャブ構造には、転倒した際に運転者を保護しうる構造が採用されつつあり、EOPS(Excavotor’s Operation Protection Structure)性能が重要視されている。例えば、特許文献1には、各種のパイプ状部材を籠状に組み付けてフレーム構造とした建設機械のキャブ構造が開示されている。このような構成によれば、板金部材の組合せのみによって構成されたキャブ構造と比較して、建設機械が転倒した際の変形に対する剛性を大幅に向上させることができる。   2. Description of the Related Art In recent years, cab structures in construction machines are being adopted that can protect the driver when the vehicle falls over, and EOPS (Excavator's Operation Protection Structure) performance is regarded as important. For example, Patent Document 1 discloses a cab structure for a construction machine in which various pipe-shaped members are assembled in a bowl shape to form a frame structure. According to such a structure, the rigidity with respect to a deformation | transformation at the time of a construction machine falling down can be improved significantly compared with the cab structure comprised only by the combination of a sheet metal member.

上記のキャブ構造には、運転者が乗り降りするための昇降用開口が形成されており、これを開閉するためのドア開閉構造が設けられている。
ドア開閉構造は、閉じたときの気密性を高めるためにシール構造を有している。このシール構造のシール部材は、例えばゴム製であり、昇降用開口の周囲に設けられることが多い。但し、パイプ状部材を柱部材として用いている場合は、柱部材側にシール部材取付け用のフランジを形成するのが困難である。そこで、別の方法として、シール部材をドアに取り付けて、ドアが閉じられるときにシール部材がキャブ本体の昇降用開口に密着するようにする構造も知られている。
特開2003−261064号公報(平成15年9月16日公開)
The above cab structure is formed with an opening for raising and lowering for a driver to get on and off, and a door opening and closing structure for opening and closing the opening is provided.
The door opening / closing structure has a seal structure in order to improve airtightness when closed. The seal member having this seal structure is made of, for example, rubber and is often provided around the lifting opening. However, when a pipe-shaped member is used as a column member, it is difficult to form a flange for attaching a seal member on the column member side. Therefore, as another method, there is also known a structure in which a seal member is attached to a door so that the seal member comes into close contact with the opening for raising and lowering the cab body when the door is closed.
Japanese Patent Laid-Open No. 2003-261064 (released on September 16, 2003)

しかしながら、上記従来のキャブ構造では、以下に示すような問題点を有している。
特許文献1の図1や図2に示すように、柱部材の下部は各種の支持部材によって支持されている。これら支持部材としては、柱部材の下端を支持するベース部材、ベース部材同士を連結するために延びる連結部材がある。したがって、部品点数が多くなっており、しかもこれらを溶接等で連結するためキャブの組立精度が低下することがある。
However, the conventional cab structure has the following problems.
As shown in FIG. 1 and FIG. 2 of Patent Document 1, the lower part of the pillar member is supported by various support members. As these support members, there are a base member that supports the lower end of the column member and a connecting member that extends to connect the base members together. Therefore, the number of parts is increased, and the assembly accuracy of the cab may be lowered because they are connected by welding or the like.

特許文献1では、柱部材の下部を支持する部材としては、さらに、厚肉化した柱部材の支点部を強化するための補強部材(34)が示されている。補強部材は、図から明らかなように、概ね三角形状の板部材である。補強部材は複数の面を有しており、各面の境界は例えば直角に形成されている。   In Patent Document 1, a reinforcing member (34) for reinforcing a fulcrum portion of a thickened column member is shown as a member that supports the lower portion of the column member. As is apparent from the drawing, the reinforcing member is a generally triangular plate member. The reinforcing member has a plurality of surfaces, and the boundary between the surfaces is formed at a right angle, for example.

このような構造において、シール部材を補強部材の面の境界部に沿うような湾曲形状とする設計が考えられる。しかしながら、補強部材の面と面の境界部は角を持っているため、シール部材や両者の間に入る部材が補強部材の角から作用する力によって破損しやすいと考えられる。したがって、そのような設計は採用しがたい。   In such a structure, a design in which the sealing member has a curved shape along the boundary portion of the surface of the reinforcing member is conceivable. However, since the boundary between the surfaces of the reinforcing member has a corner, it is considered that the seal member and the member that enters between the two are easily damaged by the force acting from the corner of the reinforcing member. Therefore, such a design is difficult to adopt.

そこでこの場合は、補強部材の柱部材と連結部材がなす隅部にシール部材を配置し、シール部材の隅部が直角形状となるように設計される。この構造を実現するためには、2つのシール部材の斜めの端部を加硫接着することになる。しかし、加硫接着を用いると、断面が不均一になって水密性が低下するという問題が生じてしまうため、隅部が直角形状のシール部材を採用することは望ましくない。   Therefore, in this case, the sealing member is arranged at the corner formed by the column member and the connecting member of the reinforcing member, and the corner of the sealing member is designed to have a right-angle shape. In order to realize this structure, the oblique end portions of the two sealing members are vulcanized and bonded. However, when vulcanized bonding is used, there is a problem that the cross section becomes non-uniform and water tightness is deteriorated. Therefore, it is not desirable to employ a seal member having a right-angle corner.

本発明の課題は、隅部が直角形状のシール部材を採用する必要がない柱支持部材およびそれを有する建設機械用キャブを提供することにある。   An object of the present invention is to provide a column support member that does not need to adopt a seal member having a right-angle corner and a cab for a construction machine having the column support member.

第1の発明に係る柱支持部材は、建設機械の旋回フレームに搭載されるキャブを構成する複数の柱部材のうち左右一対の柱部材の下部間を支持する柱支持部材であって、ベース部と接続部とを備えている。接続部は、ベース部と一体に形成され、柱部材の下部の側面に接続する。接続部は、主に曲面を介して連続する複数の面を有しており、キャブに設けられる扉のシール構造の一部を構成している。   A column support member according to a first aspect of the present invention is a column support member that supports a lower portion of a pair of left and right column members among a plurality of column members constituting a cab mounted on a turning frame of a construction machine, and includes a base portion And a connecting portion. The connecting portion is formed integrally with the base portion, and is connected to the lower side surface of the column member. The connecting portion mainly has a plurality of continuous surfaces via curved surfaces, and constitutes a part of a door seal structure provided in the cab.

従来であればシール部材は、例えば柱部材と板部材とによって構成される直角のつなぎ目部分に沿うように直角の隅部を有していた。しかし、本発明では、接続部は主に曲面を介して連続する各面を有しているため、接続部からシール部材に力が作用してもシール部材が破損しにくい。そこで、シール部材からの荷重を接続部に受けさせることができる。その結果、隅部が直角形状のシール部材を採用する必要が無くなる。   Conventionally, the sealing member has a right-angled corner so as to follow a right-angled joint formed by, for example, a column member and a plate member. However, in the present invention, since the connecting portion mainly has each surface continuous through a curved surface, the sealing member is not easily damaged even if a force acts on the sealing member from the connecting portion. Therefore, the load from the seal member can be received by the connecting portion. As a result, it is not necessary to employ a seal member having a right-angle corner.

第2の発明に係る柱支持部材は、第1の発明に係る柱支持部材であって、接続部は、左右一対の柱部材の一方において左右一対の柱部材の前後方向を向く面に当接している。   A column support member according to a second invention is the column support member according to the first invention, and the connecting portion abuts on a surface of the pair of left and right column members facing the front-rear direction of the pair of left and right column members. ing.

第3の発明に係る柱支持部材は、第1または第2の発明に係る柱支持部材であって、支持部材は鍛造または鋳造部品である。
ここでは、柱支持部材が鍛造または鋳造製品であるため、接続部の複数の面を主に曲面を介して連続させるのが容易である。
A column support member according to a third invention is the column support member according to the first or second invention, and the support member is a forged or cast part.
Here, since the column support member is a forged or cast product, it is easy to continuously connect a plurality of surfaces of the connecting portion mainly through a curved surface.

第4の発明に係る柱支持部材は、第1から第3の発明のいずれかに1つに係る柱支持部材であって、柱支持部材は、接続部と一体に形成され、接続部から左右一対の柱部材のうち他方の柱部材に接続される他の柱支持部材と連結される連結部を有している。
ここでは、一対の柱支持部材によって一対の柱部材間を支持している。柱支持構造を一対の柱支持部材から構成することで、柱支持構造についての歩留まりが良くなる。
A column support member according to a fourth aspect of the present invention is the column support member according to any one of the first to third aspects, wherein the column support member is formed integrally with the connection portion, and left and right from the connection portion. It has a connection part connected with the other pillar support member connected to the other pillar member among a pair of pillar members.
Here, the pair of column members are supported by the pair of column support members. By constituting the column support structure from a pair of column support members, the yield of the column support structure is improved.

第5の発明に係る柱支持部材は、第1〜第4の発明のいずれかに1つに係る柱支持部材であって、左右一対の柱部材は、キャブの前側に配置される左右一対の柱部材である。
ここでは、キャブの前側の左右一対の柱部材の下部およびそれを支持する部分は、キャブにおいて最も応力が集中しやすい部分である。一方、本発明の柱支持部材は一体の部材であり、そのため溶接部を柱支持部材から離すことで強度を向上させている。したがって、本発明の柱支持部材をキャブ前側の左右一対の柱部材に適用することの意義が大きい。
A column support member according to a fifth invention is a column support member according to any one of the first to fourth inventions, wherein the pair of left and right column members are a pair of left and right arranged on the front side of the cab. It is a column member.
Here, the lower part of the pair of left and right column members on the front side of the cab and the part that supports it are the parts where stress is most likely to concentrate in the cab. On the other hand, the column support member of the present invention is an integral member, and therefore the strength is improved by separating the weld from the column support member. Therefore, it is significant to apply the column support member of the present invention to the pair of left and right column members on the cab front side.

第6の発明に係る建設機械用キャブは、第1から第5の発明のいずれか1つに係る柱支持部材と備えている。
ここでは、前述の柱支持部材を用いることで、キャブの部品点数が少なくなる。
A cab for construction machinery according to a sixth aspect of the invention includes the column support member according to any one of the first to fifth aspects of the invention.
Here, the number of parts of the cab is reduced by using the above-described column support member.

第7の発明に係る建設機械用キャブは、第6の発明に係る建設機械用キャブであって、柱部材はパイプ製である。
ここでは、柱部材がパイプ製であるため、他の構造に比べて、柱部材の下部を板部材に固定する部分に2つの面が主に曲面を介して連続する形状を形成しにくい。そのため、本発明の構造を採用することでシール部材からの荷重を接続部に受けさせることができるという効果の意義が大きい。
A construction machine cab according to a seventh aspect is the construction machine cab according to the sixth aspect, wherein the column member is made of a pipe.
Here, since the column member is made of a pipe, it is difficult to form a shape in which two surfaces are mainly continuous via a curved surface at a portion where the lower part of the column member is fixed to the plate member, as compared with other structures. Therefore, the significance of the effect that the load from the seal member can be received by the connecting portion by employing the structure of the present invention is significant.

第8の発明に係る建設機械用キャブは、第6または7の発明に係る建設機械用キャブであって、扉部材をさらに備えている。扉部材は、扉本体と、扉本体が閉じられた状態で接続部とともにシール構造を構成するシール部材とを有している。
ここでは、シール部材が接続部とともにシール構造を実現するため、シール部材を柱部材と板からなる直角部分に沿わせる必要がなく、シール部材の端部を加硫接着する必要がない。
A construction machine cab according to an eighth invention is the construction machine cab according to the sixth or seventh invention, further comprising a door member. The door member includes a door main body and a seal member that forms a seal structure together with the connecting portion in a state where the door main body is closed.
Here, since the seal member realizes a seal structure together with the connecting portion, it is not necessary to place the seal member along a right-angled portion formed by the column member and the plate, and it is not necessary to vulcanize and bond the end portion of the seal member.

本発明に係る柱支持部材および建設機械用キャブによれば、接続部が主に曲面を介して連続する各面を有しているため、接続部からシール部材に力が作用してもシール部材が破損しにくい。そこで、シール部材からの荷重を接続部に受けさせることができる。その結果、隅部が直角形状のシール部材を採用する必要が無くなる。   According to the pillar support member and the cab for construction machinery according to the present invention, since the connecting portion has each surface that mainly continues through the curved surface, the sealing member even if a force acts on the sealing member from the connecting portion. Is hard to break. Therefore, the load from the seal member can be received by the connecting portion. As a result, it is not necessary to employ a seal member having a right-angle corner.

[装置全体の構成]
本発明の一実施形態に係る柱支持部材およびそれが採用されたキャブを搭載した油圧ショベルについて、図1〜図12を用いて説明すれば以下の通りである。
なお、以下の説明において使用する「左右」「前後」「前面背面」という文言は、キャブ10(図1等参照)内でオペレータが椅子に座ったときに向く方向を基準とする方向を示すものとする。
[Configuration of the entire device]
A hydraulic excavator equipped with a column support member according to an embodiment of the present invention and a cab employing the column support member will be described with reference to FIGS.
Note that the terms “left and right”, “front and rear”, and “rear front” used in the following description indicate directions in the cab 10 (see FIG. 1 etc.) that are based on the direction that the operator faces when sitting on a chair. And

[油圧ショベル1全体の構成]
本実施形態に係る油圧ショベル1は、図1に示すように、主に、下部走行体2と、旋回台3と、作業機4と、カウンタウェイト5と、エンジン6と、キャブ10とを備えている。
[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, the hydraulic excavator 1 according to the present embodiment mainly includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, an engine 6, and a cab 10. ing.

下部走行体2は、進行方向左右両端部分に巻き掛けられた履帯Pを回転させることで、油圧ショベル1を前進、後進させるとともに、上面側に旋回台3を旋回可能な状態で搭載している。
旋回台3は、下部走行体2上において任意の方向に旋回可能であって、上面に作業機4と、カウンタウェイト5と、エンジン6と、キャブ10とを搭載している。
The lower traveling body 2 has the crawler belt P wound around the left and right ends of the traveling direction rotated to move the excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side in a swingable state. .
The swivel base 3 can swivel in any direction on the lower traveling body 2, and has a work machine 4, a counterweight 5, an engine 6, and a cab 10 mounted on the upper surface.

作業機4は、ブームと、ブームの先端に取り付けられたアームと、アームの先端に取り付けられたバケットとを含むように構成されており、油圧シリンダによってアームやバケット等を上下に移動させながら、土砂や砂礫等の掘削を行う土木工事の現場において作業を行う。   The work implement 4 is configured to include a boom, an arm attached to the tip of the boom, and a bucket attached to the tip of the arm. While moving the arm, bucket, and the like up and down by a hydraulic cylinder, Work at the site of civil engineering work where excavation of earth and sand and gravel.

カウンタウェイト5は、例えば、鋼板を組み立てて形成した箱の中に屑鉄やコンクリート等を入れて固めたものであって、採掘時等において車体のバランスをとるために旋回台3の後部に設けられている。
エンジン6は、下部走行体2や作業機4を駆動するための駆動源であって、カウンタウェイト5に隣接する位置に配置されている。
The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and hardened, and is provided at the rear part of the swivel base 3 to balance the vehicle body during mining or the like. ing.
The engine 6 is a drive source for driving the lower traveling body 2 and the work implement 4, and is disposed at a position adjacent to the counterweight 5.

キャブ10は、油圧ショベル1のオペレータが乗降する運転室であって、作業機4の先端部を見通せるように、旋回台3上における作業機4の側方となる左側前部に配置されている。なお、このキャブ10のキャブ構造については、後段にて詳述する。   The cab 10 is a driver's cab in which an operator of the excavator 1 gets on and off, and is disposed on the left front side on the swivel 3 so that the tip of the work machine 4 can be seen. . The cab structure of the cab 10 will be described in detail later.

[キャブ10の構造]
キャブ10は、図2に示すように、オペレータが乗降するための箱型の構造体であって、5本の各種柱部材11〜15等によって構成されている。
柱部材11〜15は、左前柱部材11と、右前柱部材12と、左後柱部材13と、右後柱部材14と、左中央柱部材15である。
左前柱部材11および右前柱部材12は、いわゆるAピラーと呼ばれており、中央部付近において折り曲げられて、キャブ10の前方において床面から立設される柱部分と天井面を構成する梁部分とを含んでいる。
[Structure of cab 10]
As shown in FIG. 2, the cab 10 is a box-shaped structure for an operator to get on and off, and includes five various column members 11 to 15.
The column members 11 to 15 are the left front column member 11, the right front column member 12, the left rear column member 13, the right rear column member 14, and the left center column member 15.
The left front pillar member 11 and the right front pillar member 12 are so-called A pillars, which are bent in the vicinity of the center portion, and a beam portion constituting a ceiling portion and a pillar portion standing from the floor surface in front of the cab 10. Including.

左後柱部材13および右後柱部材14は、いわゆるCピラーと呼ばれており、ほぼ直線状の柱としてキャブ10の後方において床面から立設されている。
左中央柱部材15は、いわゆるBピラーと呼ばれており、ほぼ直線状の柱としてキャブ10の左側面におけるほぼ中央部またはそこからわずかに後方において床面から立設されている。
The left rear pillar member 13 and the right rear pillar member 14 are so-called C pillars, and are erected from the floor behind the cab 10 as substantially linear pillars.
The left central column member 15 is called a so-called B pillar, and is erected from the floor surface at a substantially central portion on the left side surface of the cab 10 or slightly behind it as a substantially linear column.

右前柱部材12、右後柱部材14、左後柱部材13、左中央柱部材15,左前柱部材11は、フロアフレーム27によって連結されている。左前柱部材11と右前柱部材12は柱支持構造31によって連結されている(後述)。さらに、フロアフレーム27の上にはフロアカバー29が搭載される(後述)。   The right front column member 12, the right rear column member 14, the left rear column member 13, the left center column member 15, and the left front column member 11 are connected by a floor frame 27. The left front column member 11 and the right front column member 12 are connected by a column support structure 31 (described later). Further, a floor cover 29 is mounted on the floor frame 27 (described later).

さらに、キャブ10の柱部材11〜15には、図2には示していないが、左右両サイドパネル、天井パネル、後部パネルおよび底面パネルが貼られている。
左前柱部材11と左中央柱部材15の間がキャブ10の出入口21であり、ここに、図1に示すように、ドア23が設けられている。ドア23は、ヒンジ(図示せず)を回動中心として開閉可能となっている。
キャブ10は、さらに、ドア23の出入口21を閉じた状態で外部から雨水や粉塵がキャブ10内に侵入することを防止するためのシール構造25を有している(後述)。
Furthermore, although not shown in FIG. 2, the left and right side panels, the ceiling panel, the rear panel, and the bottom panel are attached to the column members 11 to 15 of the cab 10.
Between the left front column member 11 and the left center column member 15 is an entrance / exit 21 of the cab 10, and a door 23 is provided therein as shown in FIG. The door 23 can be opened and closed with a hinge (not shown) as a rotation center.
The cab 10 further includes a seal structure 25 for preventing rainwater and dust from entering the cab 10 from the outside with the doorway 21 of the door 23 closed (described later).

[キャブの柱支持構造]
左前柱部材11と右前柱部材12は、柱支持構造31によって連結されている。以下、柱支持構造31について説明する。
[Cub column support structure]
The left front column member 11 and the right front column member 12 are connected by a column support structure 31. Hereinafter, the column support structure 31 will be described.

柱支持構造31は、図3に示すように、細長く延びた部材であり、一対の柱支持部材33,33から構成されている。一対の柱支持部材33は溶接によって互いに連結されている。
一対の柱支持部材33,33は概ね同一形状である。したがって、以下、左前柱部材11に装着される柱支持部材33の構成についてのみ詳細に説明して、右前柱部材12に装着される柱支持部材33の構成については詳細な説明を省略する。
As shown in FIG. 3, the column support structure 31 is an elongated member and includes a pair of column support members 33 and 33. The pair of column support members 33 are connected to each other by welding.
The pair of column support members 33, 33 have substantially the same shape. Therefore, hereinafter, only the configuration of the column support member 33 mounted on the left front column member 11 will be described in detail, and detailed description of the configuration of the column support member 33 mounted on the right front column member 12 will be omitted.

柱支持部材33は、例えば、鍛造または鋳造によって製造された部品である。柱支持部材33は、主に、ベース部33aと、連結部33bと、当接部(接続部)33cとを備えている。ベース部33aは、フロアフレーム27の端部上に固定される平板形状の部分である。連結部33bは、ベース部33aから一方向に延びており、連結部33bの端面は他の連結部33bの端面に溶接で固定されている。   The column support member 33 is a part manufactured by forging or casting, for example. The column support member 33 mainly includes a base portion 33a, a connecting portion 33b, and a contact portion (connecting portion) 33c. The base portion 33 a is a flat plate-like portion fixed on the end portion of the floor frame 27. The connecting portion 33b extends in one direction from the base portion 33a, and the end face of the connecting portion 33b is fixed to the end face of the other connecting portion 33b by welding.

さらに、柱支持部材33の構成について、図3〜図8を用いて詳細に説明する。
当接部33cは、ベース部33aと一体に形成され、ベース部33aの端部から上方に立ち上がった壁状の部材である。より具体的には、当接部33cは、ベース部の左前端に形成されており、第1当接部(接続部)35と、第2当接部(接続部)37とを有している。第1当接部35は、平面視において、前後方向に延びている板状部分であり、左前柱部材11の右側の側面11aに当接して溶接により接続されている。第2当接部37は、第1当接部35の後端から左側に延びている板状部分であり、左前柱部材11の後側の側面11bに当接して溶接により接続されている。ここでは、第1当接部35と第2当接部37が補強部として左前柱部材11の2つの面11a,11bにそれぞれ当接しており、それにより左前柱部材11の下部の強度が向上している。また、第1当接部35と第2当接部37は表面同士が滑らかに連続しているため、左前柱部材11の各方向に対して応力集中を緩和できる。
Furthermore, the configuration of the column support member 33 will be described in detail with reference to FIGS.
The contact portion 33c is a wall-like member that is formed integrally with the base portion 33a and rises upward from the end portion of the base portion 33a. More specifically, the contact portion 33 c is formed at the left front end of the base portion, and includes a first contact portion (connection portion) 35 and a second contact portion (connection portion) 37. Yes. The first abutting portion 35 is a plate-like portion extending in the front-rear direction in plan view, and is in contact with the right side surface 11a of the left front pillar member 11 and connected by welding. The second contact portion 37 is a plate-like portion extending to the left side from the rear end of the first contact portion 35 and is in contact with the rear side surface 11b of the left front pillar member 11 and connected by welding. Here, the first contact portion 35 and the second contact portion 37 are in contact with the two surfaces 11a and 11b of the left front column member 11 as reinforcing portions, respectively, thereby improving the strength of the lower portion of the left front column member 11. is doing. Further, since the surfaces of the first contact portion 35 and the second contact portion 37 are smoothly continuous, stress concentration can be reduced in each direction of the left front column member 11.

ここでは、当接部33cとベース部33aが一体に形成されて柱支持部材33を構成しているため、従来に比べて部品点数が少なくなっている。部品点数が少ないため、溶接箇所が減っている。したがって、溶接による歪みが減ってキャブ10の底面の平面度が向上している。その結果、歪み取り工程における作業低減が可能になる。   Here, since the contact portion 33c and the base portion 33a are integrally formed to constitute the column support member 33, the number of parts is reduced as compared with the conventional case. Because there are few parts, the number of welds is reduced. Therefore, distortion due to welding is reduced and the flatness of the bottom surface of the cab 10 is improved. As a result, the work in the distortion removing process can be reduced.

また、キャブ10の前側の左右一対の柱部材11,12の下部およびそれを支持する部分は、キャブ10において最も応力が集中しやすい部分である。一方、本発明の柱支持部材33は一体の部材であり、そのため溶接部を柱部材11から離すことできる。したがって、本発明の柱支持部材33をキャブ前側の左右一対の柱部材に適用することの意義が大きい。溶接部を柱部材11,12から離れることで、強度が向上するからである。   Further, the lower part of the pair of left and right column members 11, 12 on the front side of the cab 10 and the part that supports it are the parts where stress is most easily concentrated in the cab 10. On the other hand, the column support member 33 of the present invention is an integral member, so that the welded portion can be separated from the column member 11. Therefore, it is significant to apply the column support member 33 of the present invention to a pair of left and right column members on the cab front side. This is because the strength is improved by separating the welded portion from the column members 11 and 12.

連結部33bは、主に、板部39と段部41とから構成されている。板部39はベース部33aから延びる平坦な部分である。段部41は、第1当接部35の上面から下降していき、板部39に沿って延びており、板部39から上方に突出している。
第2当接部37について詳細に説明する。第2当接部37は、第1当接部35とともに左前柱部材11の下部を側方から支持するための構造である。第2当接部37は、上面45と、後側面47と、先端面49とを有している。
The connecting portion 33b is mainly composed of a plate portion 39 and a step portion 41. The plate portion 39 is a flat portion extending from the base portion 33a. The step portion 41 descends from the upper surface of the first contact portion 35, extends along the plate portion 39, and protrudes upward from the plate portion 39.
The second contact portion 37 will be described in detail. The second contact portion 37 is a structure for supporting the lower portion of the left front pillar member 11 from the side together with the first contact portion 35. The second contact portion 37 has an upper surface 45, a rear side surface 47, and a front end surface 49.

上面45は、上側を向いた面であり、左右方向に延びている。後側面47は上面45から後方になだらかに下降していく湾曲面であり、左後柱部材13側を向いている。先端面49は、後側面47から滑らかに連続して左側(柱支持部材33が延びる方向の外側)を向いている。第2当接部37は、さらに前側面48と、下側面50とを有している。前側面48は、鉛直方向に延びる概ね平坦な面であり、左前柱部材11の後ろ側の側面11bに当接する。下側面50はフロアフレーム27の上面に当接する。先端面49は、上面45、後側面47、さらにはそれらの反対側の面48,50によって形成されている。上面45と、後側面47と、先端面49等の各面は、互いに曲面を介して連続しており、言い換えると、各面の境界には稜線が現れるような角部は形成されていない。   The upper surface 45 is a surface facing upward, and extends in the left-right direction. The rear side surface 47 is a curved surface that gently descends backward from the upper surface 45 and faces the left rear column member 13 side. The front end surface 49 is smoothly continuous from the rear side surface 47 and faces the left side (outside in the direction in which the column support member 33 extends). The second contact portion 37 further has a front side surface 48 and a lower side surface 50. The front side surface 48 is a substantially flat surface extending in the vertical direction, and abuts on the side surface 11b on the rear side of the left front column member 11. The lower side surface 50 abuts on the upper surface of the floor frame 27. The front end surface 49 is formed by an upper surface 45, a rear side surface 47, and surfaces 48 and 50 on the opposite side thereof. Each surface, such as the upper surface 45, the rear side surface 47, and the front end surface 49, is continuous with each other via a curved surface. In other words, no corner is formed at the boundary between the surfaces.

柱支持部材33の左前柱部材11に対する溶接箇所は、当接部33cの第1当接部35の上面と第2当接部37の上面45に沿った箇所のみである。このように、溶接箇所を最小限にすることで、キャブ10の底面の平面度が向上している。
さらに、一対の柱支持部材33の連結部33b同士は先端面が互いに当接した状態で溶接されている。一対の柱支持部材33の連結部33b同士は、キャブの左右一対の柱部材間の略中央で連結されているため、溶接箇所が両方の柱部材11,12及び当接部33cから最も離れているため、溶接による歪みが一対の柱部材11,12の下部や柱支持部材33の当接部33c等に影響しにくい。そのため、キャブ10の底面の平面度がさらに向上する。
The welding locations of the column support member 33 to the left front column member 11 are only locations along the upper surface of the first contact portion 35 and the upper surface 45 of the second contact portion 37 of the contact portion 33c. Thus, the flatness of the bottom surface of the cab 10 is improved by minimizing the number of welds.
Further, the connecting portions 33b of the pair of column support members 33 are welded with their front end surfaces in contact with each other. Since the connecting portions 33b of the pair of column support members 33 are connected at the approximate center between the pair of left and right column members of the cab, the welding location is farthest from both the column members 11 and 12 and the contact portion 33c. Therefore, distortion due to welding hardly affects the lower portions of the pair of column members 11 and 12, the contact portion 33 c of the column support member 33, and the like. Therefore, the flatness of the bottom surface of the cab 10 is further improved.

図12に示すように、フロアカバー29の端部は、柱支持部材33の上側に配置されている。さらに、フロアカバー29の端部の一部は覆い部29aを有しており、覆い部29aは、柱支持部材33の当接部33cの第2当接部37の先端面49に近接している。   As shown in FIG. 12, the end of the floor cover 29 is disposed above the column support member 33. Further, a part of the end portion of the floor cover 29 has a cover portion 29 a, and the cover portion 29 a is close to the front end surface 49 of the second contact portion 37 of the contact portion 33 c of the column support member 33. Yes.

[シール部の構造]
シール構造25は、主に、シール部材51と、ドア23が閉じられた状態でシール部材51と当接する他の部材とから構成されている。シール部材51は、ドア23の概ね縁全体に沿って配置されている。
シール部材51の前側下方の隅部は、図8〜図10に示すように、滑らかに湾曲した湾曲隅部51aとなっている。ドア23が閉じられた状態で、シール部材51の湾曲隅部51aは、フロアカバー29の覆い部29aを間に介して、柱支持部材33の先端面49に沿って延びている。これにより、シール部材51の湾曲隅部51aからの荷重は、柱支持部材33の先端面49によって主に受けられる。なお、シール部材51の湾曲隅部51aは、フロアフレーム27の縁部および左前柱部材11の縁部に荷重を付与している。以上より、ドア23が閉じた状態で、シール部材51の湾曲隅部51aは主に先端面49とともにシール構造25の一部を実現している。
[Structure of seal part]
The seal structure 25 mainly includes a seal member 51 and other members that come into contact with the seal member 51 when the door 23 is closed. The seal member 51 is disposed along substantially the entire edge of the door 23.
As shown in FIGS. 8 to 10, the corner on the lower front side of the seal member 51 is a curved corner 51 a that is smoothly curved. In a state where the door 23 is closed, the curved corner portion 51 a of the seal member 51 extends along the front end surface 49 of the column support member 33 with the cover portion 29 a of the floor cover 29 interposed therebetween. Thereby, the load from the curved corner portion 51 a of the seal member 51 is mainly received by the distal end surface 49 of the column support member 33. The curved corner 51a of the seal member 51 applies a load to the edge of the floor frame 27 and the edge of the left front pillar member 11. As described above, with the door 23 closed, the curved corner 51 a of the seal member 51 mainly realizes a part of the seal structure 25 together with the tip surface 49.

シール部材51と柱支持部材33によるシール構造25の実現について、さらに詳細に説明する。当接部33cは、滑らかに連続する複数の面45〜50を有しており、ドア23のシール構造25の一部を構成している。より詳細には、シール部材51と第2当接部37の各面によってシール構造25が構成されている。従来であればシール部材は、例えば左前柱部材11とフロアフレーム27とによって構成される直角のつなぎ目部分に沿うように直角な隅部を有していた。しかし、本発明では、当接部33cは滑らかに連続する各面45〜50を有しているため、当接部33cからシール部材51やその間のフロアカバー29の覆い部29aに力が作用してもシール部材51やフロアカバー29が破損しにくい。より具体的には、シール部材51に対して第2当接部37の後側面47と先端面49の境界部分や上面45と先端面49の境界部分から力が作用しても、第2当接部37の後側面47と先端面49は滑らかに連続しているため、シール部材51やフロアカバー29の破損の可能性が低い。そこで、シール部材51からの荷重を当接部33cに受けさせることができる。その結果、シール部材を左前柱部材11とフロアフレーム27からなる直角の隅部に沿わせる必要がない。この結果、加硫接着を用いたシール部材を採用する必要がなく、そのため、水密性が向上し、さらにシール部材の製造コストを低くできる。   The realization of the seal structure 25 by the seal member 51 and the column support member 33 will be described in more detail. The contact portion 33 c has a plurality of smoothly continuous surfaces 45 to 50 and constitutes a part of the seal structure 25 of the door 23. More specifically, the seal structure 25 is configured by the surfaces of the seal member 51 and the second contact portion 37. Conventionally, the seal member has a right-angled corner so as to follow a right-angled joint formed by the left front pillar member 11 and the floor frame 27, for example. However, in the present invention, the contact portion 33c has smoothly continuous surfaces 45 to 50. Therefore, a force acts on the seal member 51 and the cover portion 29a of the floor cover 29 therebetween from the contact portion 33c. However, the seal member 51 and the floor cover 29 are not easily damaged. More specifically, even if a force acts on the seal member 51 from the boundary portion between the rear side surface 47 and the front end surface 49 of the second contact portion 37 or the boundary portion between the upper surface 45 and the front end surface 49, the second contact Since the rear side surface 47 and the front end surface 49 of the contact portion 37 are smoothly continuous, the possibility of damage to the seal member 51 and the floor cover 29 is low. Therefore, the load from the seal member 51 can be received by the contact portion 33c. As a result, it is not necessary to place the seal member along a right-angled corner formed by the left front pillar member 11 and the floor frame 27. As a result, it is not necessary to employ a seal member using vulcanization adhesion, and therefore, water tightness is improved and the manufacturing cost of the seal member can be reduced.

この構成では、柱支持部材33が鍛造品または鋳造品であるため、当接部33cの複数の面47〜50を滑らかに連続させるのが容易である。
特に、キャブ10の柱部材11、12等がパイプ製であるため、プレス材を支柱に用いた場合に比べて、柱部材の下部をフロアフレームに固定する部分に2つの面が滑らかに連続する形状を形成しにくい。そのため、本発明の構造を採用することで得られる効果(シール部材の荷重を受ける部材の面同士を滑らかに連続させる)の意義が大きい。
In this configuration, since the column support member 33 is a forged product or a cast product, it is easy to smoothly connect the plurality of surfaces 47 to 50 of the contact portion 33c.
In particular, since the pillar members 11, 12 and the like of the cab 10 are made of pipe, compared to the case where the press material is used for the pillar, the two surfaces smoothly continue to the portion where the lower part of the pillar member is fixed to the floor frame. It is difficult to form a shape. For this reason, the significance of the effect obtained by adopting the structure of the present invention (the surfaces of the members that receive the load of the sealing member smoothly continue) is significant.

以上のように、鍛造化により部材を集約させることで、小物物品の削減や溶接部位の減少を実現している。さらに補強部を滑らかな形状とすることで、応力集中を緩和している。また、補強部を一対の柱部材に沿うように立ち上げる形状とすることで、支点部の前後方向および左右方向に対して応力集中を緩和している。   As described above, by collecting members by forging, reduction of small articles and reduction of welded parts are realized. Furthermore, the stress concentration is eased by making the reinforcing part a smooth shape. Moreover, the stress concentration is eased with respect to the front-rear direction and the left-right direction of the fulcrum portion by forming the reinforcing portion so as to rise along the pair of column members.

[他の実施形態]
以上、本発明の一実施形態について説明したが、本発明は上記実施形態に限定されるものではなく、発明の要旨を逸脱しない範囲で種々の変更が可能である。
前記実施形態では、柱支持構造はキャブの前側の左右一対の柱部材を支持していたが、これをキャブの後側の左右一対の柱部材を支持するのに用いても良い。
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.
In the above embodiment, the column support structure supports the pair of left and right column members on the front side of the cab. However, this may be used to support the pair of left and right column members on the rear side of the cab.

本実施形態では油圧ショベルを例に挙げて説明したが、油圧ショベル以外の建設機械(ホイールローダやブルドーザなど)にも適用可能である。
上記実施形態では、柱支持部材33の当接部33cやシール構造25の詳細な例を挙げて説明した。しかし、本発明はこれに限定されるものではない。
In the present embodiment, a hydraulic excavator has been described as an example, but the present invention can also be applied to a construction machine (wheel loader, bulldozer, etc.) other than the hydraulic excavator.
In the said embodiment, the contact part 33c of the pillar support member 33 and the detailed example of the seal structure 25 were mentioned and demonstrated. However, the present invention is not limited to this.

本発明の柱支持部材は、接続部が主に曲面を介して連続する各面を有しているため、隅部が直角形状のシール部材を採用する必要が無いという効果を奏することから、建設機械用キャブに対して広く適用可能である。   The column support member of the present invention has an effect that it is not necessary to employ a seal member having a right-angled corner portion because the connection portion has each surface mainly connected through a curved surface. Widely applicable to machine cabs.

本発明の一実施形態に係るキャブが採用された油圧ショベルの側面概略図。1 is a schematic side view of a hydraulic excavator in which a cab according to an embodiment of the present invention is employed. パネルやドアを取り除いた状態でのキャブの斜視図。The perspective view of the cab in the state which removed the panel and the door. 本発明の一実施形態に係る支持構造の斜視図。The perspective view of the support structure concerning one embodiment of the present invention. 本発明の一実施形態に係る支持構造の平面図。The top view of the support structure which concerns on one Embodiment of this invention. 本発明の一実施形態に係る支持部材の平面図。The top view of the supporting member which concerns on one Embodiment of this invention. 本発明の一実施形態に係る支持部材の正面図。The front view of the supporting member which concerns on one Embodiment of this invention. 第1柱部材の下端部および支持部材の一部の斜視図。The perspective view of the lower end part of a 1st pillar member, and a part of support member. シール構造の斜視図。The perspective view of a seal structure. シール構造の斜視図。The perspective view of a seal structure. シール構造の正面図。The front view of a seal structure. 図10のXI−XI矢視断面図。XI-XI arrow sectional drawing of FIG. 図10のXII−XII矢視断面図。XII-XII arrow sectional drawing of FIG.

符号の説明Explanation of symbols

1 油圧ショベル
2 下部走行体
3 旋回台
4 作業機
5 カウンタウェイト
6 エンジン
10 キャブ
11 左前柱部材
12 右前柱部材
13 左後柱部材
14 右後柱部材
15 左中央柱部材
21 出入口
23 ドア
25 シール構造
27 フロアフレーム
29 フロアカバー
29a 覆い部
31 柱支持機構
33 柱支持部材
33a ベース部
33b 連結部
33c 当接部(接続部)
35 第1当接部(第1接続部)
37 第2当接部(第2接続部)
39 板部
41 段部
45 上面
47 後側面
48 前側面
49 先端面
50 下側面
51 シール部材
51a 湾曲隅部
DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Undercarriage 3 Swing stand 4 Working machine 5 Counterweight 6 Engine 10 Cab 11 Left front pillar member 12 Right front pillar member 13 Left rear pillar member 14 Right rear pillar member 15 Left center pillar member 21 Entrance 23 Door 25 Seal structure 27 Floor frame 29 Floor cover 29a Cover portion 31 Column support mechanism 33 Column support member 33a Base portion 33b Connection portion 33c Contact portion (connection portion)
35 1st contact part (1st connection part)
37 2nd contact part (2nd connection part)
39 Plate part 41 Step part 45 Upper surface 47 Rear side surface 48 Front side surface 49 Front end surface 50 Lower side surface 51 Seal member 51a Curved corner

Claims (8)

建設機械の旋回フレームに搭載されるキャブを構成する複数の柱部材のうち左右一対の柱部材の下部間を支持する柱支持部材であって、
ベース部と、
前記ベース部と一体に形成され、前記柱部材の下部の側面に接続する接続部とを備え、
前記接続部は、曲面を介して連続する複数の面を有しており、前記キャブに設けられる扉のシール構造の一部を構成している、
柱支持部材。
A column support member that supports the lower part of a pair of left and right column members among a plurality of column members constituting a cab mounted on a turning frame of a construction machine,
A base part;
A connecting portion formed integrally with the base portion and connected to a lower side surface of the pillar member;
The connecting portion has a plurality of continuous surfaces via a curved surface, and constitutes a part of a door seal structure provided in the cab.
Column support member.
前記接続部は、前記左右一対の柱部材の一方において前記左右一対の柱部材の前後方向を向く面に接続している、請求項1に記載の柱支持部材。   2. The column support member according to claim 1, wherein the connection portion is connected to a surface facing the front-rear direction of the pair of left and right column members in one of the pair of left and right column members. 前記柱支持部材は鍛造または鋳造部品である、請求項1または2に記載の柱支持部材。   The column support member according to claim 1, wherein the column support member is a forged or cast part. 前記柱支持部材は、前記接続部と一体に形成され、前記接続部から前記左右一対の柱部材のうち他方の柱部材に接続される他の柱支持部材と連結される連結部を有している、請求項1から3のいずれか1項に記載の柱支持部材。   The column support member is formed integrally with the connection portion, and has a connection portion that is connected to the other column support member connected to the other column member from the connection portion to the other column member. The column support member according to any one of claims 1 to 3. 前記左右一対の柱部材は、前記キャブの前側に配置される左右一対の柱部材である、請求項1から4のいずれか1項に記載の柱支持部材。   5. The column support member according to claim 1, wherein the pair of left and right column members is a pair of left and right column members disposed on a front side of the cab. 請求項1から5のいずれか1項に記載の柱支持部材とを、
備えた建設機械用キャブ。
The column support member according to any one of claims 1 to 5,
A cab for construction machinery equipped.
前記柱部材はパイプ製である、請求項6に記載の建設機械用キャブ。   The cab for construction machinery according to claim 6, wherein the pillar member is made of a pipe. 扉部材をさらに備え、
前記扉部材は、扉本体と、前記扉本体が閉じられた状態で前記接続部とともにシール構造を構成するシール部材とを有している、請求項6または7に記載の建設機械用キャブ。
A door member,
The cab for a construction machine according to claim 6 or 7, wherein the door member includes a door main body and a seal member that forms a seal structure together with the connecting portion in a state where the door main body is closed.
JP2008093869A 2008-03-31 2008-03-31 Column support member and construction machine cab Expired - Fee Related JP5065968B2 (en)

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CN103534164B (en) 2011-05-17 2015-12-09 丰田自动车株式会社 Vehicle body framework construction
JP6572162B2 (en) * 2016-03-31 2019-09-04 株式会社クボタ Work machine and cabin of work machine

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JP4029632B2 (en) * 2002-03-06 2008-01-09 日立建機株式会社 Cabin structure of construction machinery
JP2004306797A (en) * 2003-04-08 2004-11-04 Komatsu Ltd Sealing structure of sliding door
JP4291206B2 (en) * 2004-05-19 2009-07-08 日立建機株式会社 Construction machinery cab
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