JP6262118B2 - Construction machine swivel frame - Google Patents
Construction machine swivel frame Download PDFInfo
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- JP6262118B2 JP6262118B2 JP2014213041A JP2014213041A JP6262118B2 JP 6262118 B2 JP6262118 B2 JP 6262118B2 JP 2014213041 A JP2014213041 A JP 2014213041A JP 2014213041 A JP2014213041 A JP 2014213041A JP 6262118 B2 JP6262118 B2 JP 6262118B2
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- 238000010276 construction Methods 0.000 title claims description 14
- 238000003466 welding Methods 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
Description
本発明は、油圧ショベル等の建設機械に用いられる旋回フレームに関する。 The present invention relates to a swing frame used for construction machines such as a hydraulic excavator.
一般に、建設機械の代表例である油圧ショベルは、自走可能な下部走行体と、下部走行体上に旋回自在に搭載された上部旋回体と、上部旋回体に俯仰動自在に接続された作業腕装置とから大略構成されている。 In general, a hydraulic excavator, which is a typical example of a construction machine, is a self-propelled lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, and a work that is connected to the upper revolving body so as to be able to move up and down. It is generally composed of an arm device.
上部旋回体は骨組み構造体をなす旋回フレームを備えており、この旋回フレームには、運転員が搭乗するキャブと、エンジンや熱交換器等の各種機器が収容された機器収容室と、作業腕装置に対して重量バランスをとるカウンタウエイト等が配設されている。 The upper swivel body includes a swivel frame that forms a framework structure. The swivel frame includes a cab on which an operator is boarded, a device storage chamber in which various devices such as an engine and a heat exchanger are stored, and a work arm. A counterweight for balancing the weight with respect to the apparatus is provided.
旋回フレームは、底板と、底板上に立設され且つ前後方向に延びる左右一対の縦板と、左側に位置する縦板の外面から左方向に延出する複数の左サポート部材と、右側に位置する縦板の外面から右方向に延出する複数の右サポート部材と、複数の左サポート部材の延出端の各々に接続され且つ前後方向に延びる左スカート板と、複数の右サポート部材の延出端の各々に接続され且つ前後方向に延びる右スカート板とを備えている。 The swivel frame includes a bottom plate, a pair of left and right vertical plates that are erected on the bottom plate and extend in the front-rear direction, a plurality of left support members that extend leftward from the outer surface of the vertical plate located on the left side, and a position on the right side A plurality of right support members extending rightward from the outer surface of the vertical plate, a left skirt plate connected to each of the extending ends of the plurality of left support members and extending in the front-rear direction, and an extension of the plurality of right support members A right skirt plate connected to each of the leading ends and extending in the front-rear direction.
油圧ショベルにおいては、多くの場合にキャブが旋回フレームの左前側に配設されており、複数の左側サポート部材には、キャブの前側を支持する前キャブサポート部材と、キャブの後側を支持する後キャブサポート部材とが含まれる。そして、キャブは、前キャブサポート部材及び後キャブサポート部材によって下側から支持されている。 In a hydraulic excavator, in many cases, a cab is disposed on the left front side of the revolving frame, and a plurality of left support members support a front cab support member that supports the front side of the cab and a rear side of the cab. And a rear cab support member. The cab is supported from below by the front cab support member and the rear cab support member.
油圧ショベルは、傾斜地や不整地等において油圧ショベルが転倒した場合に、キャブ内に搭乗した運転員が押しつぶされてしまう危険から守るため、このような場合でもキャブ内の空間を一定程度確保し得ることが望まれている。そこで、油圧ショベルにおいては、キャブを構成する部材の剛性が高められると共に、キャブが所定の範囲を超えて変位することを規制する規制部材がキャブと後キャブサポート部材の延出端との間に配設されているものがある（例えば、特許文献１参照。）。 The hydraulic excavator protects against the danger of the operator riding in the cab being crushed when the excavator falls on an inclined or rough terrain. Even in such a case, a certain amount of space in the cab can be secured. It is hoped that. Therefore, in the hydraulic excavator, the rigidity of the members constituting the cab is increased, and a restricting member that restricts the displacement of the cab beyond a predetermined range is provided between the cab and the extended end of the rear cab support member. Some are arranged (for example, refer to Patent Document 1).
上述した油圧ショベルの旋回フレームにおいては、規制部材がキャブと後キャブサポート部材の延出端との間に配設されていることから、後キャブサポート部材の曲げ荷重に対する剛性が高められている。この結果、後キャブサポート部材は、曲げ荷重に対する剛性だけでなく、捩じり荷重に対しても剛性の高い部材となっている。このため、外力による捩じり荷重が旋回フレームに作用したとき、例えば、左スカート板が前部から後部に向かって上方に傾斜して変形し、且つ、右スカート板が前部から後部に向かって下方に傾斜して変形するような捩じり荷重が旋回フレームに作用したとき、左スカート板には、後キャブサポート部材を起点として後部に向かって上方に傾斜する変形が生ずることとなる。そうすると、左スカート板は、後キャブサポート部材との接続箇所又はその近傍において、応力が集中して亀裂が入るおそれがある。 In the swing frame of the hydraulic excavator described above, since the regulating member is disposed between the cab and the extended end of the rear cab support member, the rigidity of the rear cab support member with respect to the bending load is increased. As a result, the rear cab support member is a member having high rigidity not only with respect to bending load but also with respect to torsional load. For this reason, when a torsional load due to an external force is applied to the turning frame, for example, the left skirt plate is inclined upward and deformed from the front to the rear, and the right skirt plate is directed from the front to the rear. When a torsional load that inclines downward and deforms acts on the revolving frame, the left skirt plate is deformed to incline upward toward the rear starting from the rear cab support member. If it does so, there exists a possibility that stress may concentrate and a left skirt board may be cracked in the connection location with the rear cab support member, or its vicinity.
本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、捩じり荷重が作用したときにスカート板に生ずる応力が分散され、スカート板に亀裂が入ることが防止される建設機械の旋回フレームを提供することである。 The present invention has been made in view of the above-mentioned facts, and the main technical problem thereof is that stress generated in the skirt plate when a torsional load is applied is dispersed, and cracking of the skirt plate is prevented. It is to provide a swivel frame for construction machinery.
本発明によれば、上記技術的課題を解決する建設機械の旋回フレームとして、底板と、該底板上に立設され且つ前後方向に延びる左右一対の縦板と、左側に位置する該縦板の外面から左方向に延出する複数の左サポート部材と、右側に位置する該縦板の外面から右方向に延出する複数の右サポート部材と、該複数の左サポート部材の延出端の各々に接続され且つ前後方向に延びる左スカート板と、該複数の右サポート部材の延出端の各々に接続され且つ前後方向に延びる右スカート板とを備える建設機械の旋回フレームにおいて、該複数の左サポート部材又は該複数の右サポート部材は、運転員が搭乗するキャブの後側を支持する後キャブサポート部材を含み、該後キャブサポート部材は、前後方向に間隔をおいて配設された前面板及び背面板、該前面板の上端と該背面板の上端とに接続された天面板、並びに該前面板の下端と該背面板の下端とに接続された底面板を有し、該天面板には左右方向に細長く延びる第１のスリットが形成され、該底面板には左右方向に細長く延びる第２のスリットが形成されている、ことを特徴とする建設機械の旋回フレームが提供される。 According to the present invention, as a revolving frame of a construction machine that solves the above technical problem, a bottom plate, a pair of left and right vertical plates that are erected on the bottom plate and extend in the front-rear direction, and the vertical plate that is positioned on the left side Each of a plurality of left support members extending leftward from the outer surface, a plurality of right support members extending rightward from the outer surface of the vertical plate located on the right side, and an extending end of the plurality of left support members A plurality of left skirt plates connected to each other and extending in the front-rear direction; and a right skirt plate connected to each of the extending ends of the plurality of right support members and extending in the front-rear direction. The support member or the plurality of right support members include a rear cab support member that supports a rear side of a cab on which an operator is boarded, and the rear cab support member is disposed in a front plate disposed at intervals in the front-rear direction. And back A top plate connected to the top end of the front plate and the top end of the back plate, and a bottom plate connected to the bottom end of the front plate and the bottom end of the back plate, There is provided a swivel frame for a construction machine, characterized in that a first slit extending in the left and right direction is formed, and a second slit extending in the left-right direction is formed in the bottom plate .
好ましくは、該第１のスリットは該天面板の前後方向中央に位置する。該天面板の延出端には規制部材取付穴が形成されており、該第１のスリットの前後方向位置は該規制部材取付穴の前後方向位置と整合しているのが好都合である。 Preferably, the first slit is located at the center in the front-rear direction of the top plate. A restriction member mounting hole is formed at the extended end of the top plate, and the front-rear direction position of the first slit is advantageously aligned with the front-rear direction position of the restriction member attachment hole .
本発明によって提供される建設機械の旋回フレームにおいては、後キャブサポート部材の天面板に左右方向に細長く延びる第１のスリットが形成され、かつ後キャブサポート部材の底面板に左右方向に細長く延びる第２のスリットが形成されているので、後キャブサポート部材の曲げ荷重に対する剛性の低下が抑えられつつ、後キャブサポート部材の捩じり荷重に対する剛性が低下される。従って、本発明に係る旋回フレームは、捩じり荷重が作用したときにスカート板に生ずる応力が分散され、スカート板に亀裂が入ることが防止される。 In the swivel frame of the construction machine provided by the present invention, the first slit extending in the left-right direction is formed in the top plate of the rear cab support member, and the first slit extending in the left-right direction is formed in the bottom plate of the rear cab support member. Since the two slits are formed, the rigidity of the rear cab support member with respect to the torsional load is lowered while the rigidity of the rear cab support member with respect to the bending load is suppressed. Therefore, in the revolving frame according to the present invention, the stress generated in the skirt plate when the torsional load is applied is dispersed, and the skirt plate is prevented from cracking.
以下、本発明に係る建設機械の旋回フレームの実施形態について、代表的な建設機械である油圧ショベルを例に挙げ、添付図面を参照しつつ詳細に説明する。 Hereinafter, embodiments of a swing frame for a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator as a typical construction machine as an example.
図１を参照して説明する。全体を番号２で示す油圧ショベルは、自走可能な下部走行体４と、下部走行体４上に旋回自在に搭載された上部旋回体６と、上部旋回体６に俯仰動自在に接続された作業腕装置８とから大略構成されている。油圧ショベル２は、土砂等の掘削作業時においては、作業腕装置８が俯仰動作され、上部旋回体６が下部走行体４に対し旋回動作されることによって、土砂等の掘削作業を行うことができるようになっている。 A description will be given with reference to FIG. The hydraulic excavator indicated as a whole by number 2 is connected to a self-propelled lower traveling body 4, an upper revolving body 6 that is pivotably mounted on the lower traveling body 4, and an upper revolving body 6 that can be raised and lowered. The work arm device 8 is generally configured. The excavator 2 can perform excavation work such as earth and sand when the work arm device 8 is moved up and down and the upper swing body 6 is swung with respect to the lower traveling body 4 during excavation work such as earth and sand. It can be done.
作業腕装置８は、上部旋回体６の前側に俯仰動自在に接続されたブーム１０と、ブーム１０の先端側に揺動自在に接続されたアーム１２と、アーム１２の先端側に回動自在に接続された作業具１４と、ブーム１０を俯仰動させる左右一対のブームシリンダ１６，１６（左側のみ図示されている）と、アーム１２を揺動させるアームシリンダ１８と、作業具１４を回動させる作業具シリンダ２０とから大略構成されている。 The work arm device 8 includes a boom 10 that is movably connected to the front side of the upper swing body 6, an arm 12 that is swingably connected to the distal end side of the boom 10, and a pivotable movement toward the distal end side of the arm 12. , A pair of left and right boom cylinders 16, 16 (only the left side is shown), an arm cylinder 18 that swings the arm 12, and the work tool 14 are rotated. The work tool cylinder 20 is generally constituted.
上部旋回体６は、骨組み構造体をなす旋回フレーム２２を備えている。旋回フレーム２２には、運転員が搭乗するキャブ２４と、エンジンやエンジンの冷却水を冷却するための熱交換器等の各種機器が収容された機器収容室２６と、作業腕装置８に対して重量バランスをとるカウンタウエイト２８と、燃料を貯留する燃料タンク（図示されていない）と、作動油を貯留する作動油タンク（図示されていない）等が配設されている。これらの配設箇所については、キャブ２４は旋回フレーム２２の左前側に配設され、機器収容室２６はキャブ２４の後方に配設され、カウンタウエイト２８は旋回フレーム２２の後端に配設され、燃料タンク及び作動油タンクは旋回フレーム２２の右側に配設されている。尚、本明細書の説明で用いられている前後方向及び左右方向は、図１中のキャブ２４内に搭乗した運転員から見た前後方向及び左右方向である。 The upper revolving structure 6 includes a revolving frame 22 that forms a framework structure. The swivel frame 22 has a cab 24 on which an operator is boarded, an equipment storage chamber 26 in which various equipment such as an engine and a heat exchanger for cooling engine cooling water are stored, and the work arm device 8. A counterweight 28 that balances the weight, a fuel tank (not shown) that stores fuel, a hydraulic oil tank (not shown) that stores hydraulic oil, and the like are disposed. With respect to these arrangement locations, the cab 24 is arranged on the left front side of the revolving frame 22, the device accommodating chamber 26 is arranged behind the cab 24, and the counterweight 28 is arranged on the rear end of the revolving frame 22. The fuel tank and the hydraulic oil tank are disposed on the right side of the revolving frame 22. Note that the front-rear direction and the left-right direction used in the description of the present specification are the front-rear direction and the left-right direction as viewed from the operator who has boarded the cab 24 in FIG.
図２を参照して説明する。旋回フレーム２２は、底板３０と、底板３０上に立設され且つ左右方向に間隔をおいて前後方向に延びる左右一対の縦板３２，３４と、左側に位置する縦板３２の外面から左方向に延出する複数の左サポート部材３６と、右側に位置する縦板３４の外面から右方向に延出する複数の右サポート部材３８と、複数の左サポート部材３６の延出端の各々に接続され且つ前後方向に延びる左スカート板４０と、複数の右サポート部材３８の延出端の各々に接続され且つ前後方向に延びる右スカート板４２とを備えている。 This will be described with reference to FIG. The swivel frame 22 is provided on the bottom plate 30, and a pair of left and right vertical plates 32, 34 that are provided on the bottom plate 30 and extend in the front-rear direction at intervals in the left-right direction, and from the outer surface of the vertical plate 32 located on the left side to the left A plurality of left support members 36 extending to the right, a plurality of right support members 38 extending rightward from the outer surface of the vertical plate 34 positioned on the right side, and a plurality of left support members 36 connected to each of the extending ends. And a left skirt plate 40 extending in the front-rear direction and a right skirt plate 42 connected to each of the extending ends of the plurality of right support members 38 and extending in the front-rear direction.
底板３０及び縦板３２，３４は、作業腕装置８等から大きな荷重が作用する構造部材であり、厚肉の鋼板から形成されている。底板３０は、平板状に形成され、前後方向に延在している。縦板３２，３４は、三角形状に形成され、下端が底板３０の上面に溶接により接合されている。縦板３２，３４の頂部には、ブーム１０の基端が連結ピンを介して接続されるブーム連結ピン穴３２ａ，３４ａが形成されている。又、縦板３２，３４の前端には、ブームシリンダ１６，１６の基端が連結ピンを介して接続されるブームシリンダ連結ピン穴３２ｂ，３４ｂが形成されている。 The bottom plate 30 and the vertical plates 32 and 34 are structural members to which a large load is applied from the work arm device 8 or the like, and are formed from thick steel plates. The bottom plate 30 is formed in a flat plate shape and extends in the front-rear direction. The vertical plates 32 and 34 are formed in a triangular shape, and the lower ends are joined to the upper surface of the bottom plate 30 by welding. Boom coupling pin holes 32a and 34a to which the base end of the boom 10 is connected via coupling pins are formed at the tops of the vertical plates 32 and 34. In addition, boom cylinder coupling pin holes 32b and 34b are formed at the front ends of the vertical plates 32 and 34, to which the base ends of the boom cylinders 16 and 16 are connected via coupling pins.
縦板３２，３４間の前部には、縦板３２，３４の上端に略沿って傾斜して延在する傾斜板４４が配設されている。傾斜板４４の下端は、底板３０の上面に溶接により接合されており、傾斜板４４の左右方向両端部は、夫々、縦板３２，３４の内面に溶接により接合されている。傾斜板４４の下端側には、ブームシリンダ１６，１６に接続される油圧配管（図示されていない）等が通される四角形状の開口４４ａが形成されている。又、縦板３２，３４の後側には、夫々、前後方向に間隔をおいて、エンジンが取付けられる２個のエンジンマウント４６，４６が配設されており、更にその後側には、夫々、カウンタウエイト２８が取付けられるカウンタウエイトブラケット４８が配設されている。 In front of the vertical plates 32 and 34, an inclined plate 44 that is inclined and extends substantially along the upper ends of the vertical plates 32 and 34 is disposed. The lower end of the inclined plate 44 is joined to the upper surface of the bottom plate 30 by welding, and both left and right end portions of the inclined plate 44 are joined to the inner surfaces of the vertical plates 32 and 34, respectively. A rectangular opening 44 a through which hydraulic piping (not shown) connected to the boom cylinders 16, etc. is passed is formed on the lower end side of the inclined plate 44. In addition, two engine mounts 46 and 46 to which the engine is mounted are disposed on the rear side of the vertical plates 32 and 34, respectively, with an interval in the front-rear direction, and further on the rear side, respectively. A counterweight bracket 48 to which the counterweight 28 is attached is provided.
複数の左サポート部材３６は、キャブ２４及び熱交換器等を支持する部材であり、複数の右サポート部材３８は、燃料タンク及び作動油タンク等を支持する部材である。複数の左サポート部材３６及び複数の右サポート部材３８は、夫々、平板状の鋼板、左右方向の断面形状がＬ字状となるように屈曲加工された鋼板、左右方向の断面形状がコ字状となるように屈曲加工された鋼板、又はこれらの組合せから形成されている。 The plurality of left support members 36 are members that support the cab 24 and the heat exchanger, and the plurality of right support members 38 are members that support a fuel tank, a hydraulic oil tank, and the like. The plurality of left support members 36 and the plurality of right support members 38 are each a flat steel plate, a steel plate bent so that the cross-sectional shape in the left-right direction is L-shaped, and the cross-sectional shape in the left-right direction is U-shaped. It is formed from the steel plate bent so that it may become, or these combination.
左スカート板４０及び右スカート板４２は、夫々、旋回フレーム２２の左側外縁及び右側外縁をなす化粧部材であり、薄肉の鋼板から形成されている。左スカート板４０及び右スカート板４２は、上下方向両端部の夫々が内方に向かって屈曲されている。 The left skirt plate 40 and the right skirt plate 42 are decorative members that form the left outer edge and the right outer edge of the revolving frame 22, respectively, and are formed of thin steel plates. Each of the left skirt plate 40 and the right skirt plate 42 is bent inward at both ends in the vertical direction.
本実施例においては、キャブ２４が旋回フレーム２２の左前側に配設されており、複数の左サポート部材３６には、キャブ２４の前側を支持する前キャブサポート部材３６ａと、キャブ２４の後側を支持する後キャブサポート部材３６ｂとが含まれる。前キャブサポート部材３６ａ及び後キャブサポート部材３６ｂは、これら以外のサポート部材よりも剛性の高い鋼板から形成されている。 In the present embodiment, the cab 24 is disposed on the left front side of the revolving frame 22, and the left support member 36 includes a front cab support member 36 a that supports the front side of the cab 24, and a rear side of the cab 24. And a rear cab support member 36b for supporting the rear side. The front cab support member 36a and the rear cab support member 36b are formed of steel plates having higher rigidity than other support members.
図２と共に図３を参照して説明する。前キャブサポート部材３６ａは、左右方向の断面形状がＬ字状となるように屈曲加工されていて前面部５０ａ及び底面部５０ｂを有する前板５０と、前板５０の前面部５０ａの上端に溶接により接合された上板５２とを有している。 This will be described with reference to FIG. 3 together with FIG. The front cab support member 36a is bent so that the cross-sectional shape in the left-right direction is L-shaped, and is welded to the front plate 50 having the front surface portion 50a and the bottom surface portion 50b, and the upper end of the front surface portion 50a of the front plate 50 And an upper plate 52 joined together.
前板５０の右端は、底板３０の上面前端に接続された基端から前方に延出する接続部材５４の延出端に溶接により接合されている。又、前板５０の左端は、左スカート板４０の内面前端に溶接により接合されている。 The right end of the front plate 50 is joined by welding to the extending end of the connection member 54 that extends forward from the base end connected to the front end of the upper surface of the bottom plate 30. The left end of the front plate 50 is joined to the inner front end of the left skirt plate 40 by welding.
上板５２は、実質上水平に延在しており、その左右方向両端部の夫々に前後方向の幅が拡幅された拡幅部５２ａ，５２ａを有している。拡幅部５２ａ，５２ａには、夫々、防振マウント取付穴５２ｂ，５２ｂが形成され、防振マウント取付穴５２ｂ，５２ｂには、キャブ２４の前側を弾性的に支持する防振マウント（図示されていない）が取付けられる。拡幅部５２ａ，５２ａの後側は、夫々、下方に向かって屈曲されて前板５０の底面部５０ｂに溶接により接合されている。又、上板５２の右端は、接続部材５４の前端に溶接により接合されており、上板５２の左端は、左スカート板４０の内面前端に溶接により接合されている。 The upper plate 52 extends substantially horizontally, and has widened portions 52a and 52a in which the width in the front-rear direction is widened at each of both ends in the left-right direction. Anti-vibration mount mounting holes 52b and 52b are formed in the widened portions 52a and 52a, respectively. Anti-vibration mounts (not shown) for elastically supporting the front side of the cab 24 are provided in the anti-vibration mount mounting holes 52b and 52b. Not) is installed. The rear sides of the widened portions 52a and 52a are bent downward and joined to the bottom surface portion 50b of the front plate 50 by welding. The right end of the upper plate 52 is joined to the front end of the connecting member 54 by welding, and the left end of the upper plate 52 is joined to the inner front end of the left skirt plate 40 by welding.
図３乃至図５を参照して説明する。後キャブサポート部材３６ｂは、前後方向に間隔をおいて配設された前面板５６及び背面板５８、前面板５６の上端と背面板５８の上端とに接続された天面板６０、並びに前面板５６の下端と背面板５８の下端とに接続された底面板６２を有している。 This will be described with reference to FIGS. The rear cab support member 36b includes a front plate 56 and a back plate 58 that are spaced apart in the front-rear direction, a top plate 60 that is connected to the upper end of the front plate 56 and the upper end of the back plate 58, and the front plate 56. And a bottom plate 62 connected to the lower end of the back plate 58.
前面板５６と天面板６０とは１枚の鋼板から形成され、前面板５６の上端と天面板６０の前端とが連続している。天面板６０は、実質上水平に延在しており、その左右方向両端部の夫々に前後方向の幅が拡幅された拡幅部６０ａ，６０ａを有している。拡幅部６０ａ，６０ａには、夫々、防振マウント取付穴６０ｂ，６０ｂが形成され、防振マウント取付穴６０ｂ，６０ｂには、キャブ２４の後側を弾性的に支持する防振マウント（図示されていない）が取付けられる。拡幅部６０ａ，６０ａの後側は、夫々、下方に向かって屈曲されて底板３０及び底面板６２に溶接により接合されている。天面板６０の延出端には、外側防振マウント穴６０ｂの前方に規制部材取付穴６０ｃが形成され、規制部材取付穴６０ｃには、キャブ２４が所定の範囲を超えて変位することを規制する規制部材（図示されていない）が取付けられる。規制部材取付穴６０ｃの上部には開口が形成された補強板６１が配設されており、補強板６１の開口は規制部材取付穴６０ｃの周縁に沿って形成されている。 The front plate 56 and the top plate 60 are formed from a single steel plate, and the upper end of the front plate 56 and the front end of the top plate 60 are continuous. The top plate 60 extends substantially horizontally, and has widened portions 60a, 60a having widened widths in the front-rear direction at both ends in the left-right direction. Anti-vibration mount mounting holes 60b and 60b are formed in the widened portions 60a and 60a, respectively. Anti-vibration mounts (not shown) that elastically support the rear side of the cab 24 are provided in the anti-vibration mount mounting holes 60b and 60b. Not installed). The rear sides of the widened portions 60a, 60a are bent downward and joined to the bottom plate 30 and the bottom plate 62 by welding. At the extended end of the top plate 60, a restricting member mounting hole 60c is formed in front of the outer vibration isolation mount hole 60b. The restricting member attaching hole 60c restricts the cab 24 from being displaced beyond a predetermined range. A regulating member (not shown) is attached. A reinforcing plate 61 having an opening formed therein is disposed above the restricting member mounting hole 60c, and the opening of the reinforcing plate 61 is formed along the periphery of the restricting member mounting hole 60c.
又、天面板６０には左右方向に細長く延びる第１のスリット６０ｄが形成されている。第１のスリット６０ｄは、天面板６０の拡幅部６０ａ間に位置する部分の前後方向中央に位置付けられており、第１のスリット６０ｄの前後方向位置は、規制部材取付穴６０ｃの前後方向位置と整合している。第１のスリット６０ｄの左右方向の寸法は可能な限り長く形成されているのが好ましい。尚、第１のスリット６０ｄと規制部材取付穴６０ｃとは、図３に示すとおり連結されていないが、連結されていてもよい。 The top plate 60 is formed with a first slit 60d that is elongated in the left-right direction. The first slit 60d is positioned in the front-rear direction center of the portion located between the widened portions 60a of the top plate 60, and the front-rear direction position of the first slit 60d is the front-rear direction position of the restriction member mounting hole 60c. Consistent. It is preferable that the left and right dimensions of the first slit 60d are formed as long as possible. The first slit 60d and the restricting member mounting hole 60c are not connected as shown in FIG. 3, but may be connected.
前面板５６の下端は、底板３０の上面及び底面板６２の上面に溶接により接合されている。又、前面板５６及び天面板６０の右端は左側の縦板３２の外面に、前面板５６及び天面板６０の左端は左スカート板４０の内面に、夫々、溶接により接合されている。尚、前面板５６の下端と底板３０の上面とは必ずしも溶接により接合されていることを要しない。 The lower end of the front plate 56 is joined to the upper surface of the bottom plate 30 and the upper surface of the bottom plate 62 by welding. The right ends of the front plate 56 and the top plate 60 are joined to the outer surface of the left vertical plate 32, and the left ends of the front plate 56 and the top plate 60 are joined to the inner surface of the left skirt plate 40, respectively. Note that the lower end of the front plate 56 and the upper surface of the bottom plate 30 are not necessarily joined by welding.
背面板５８は、左右方向に延びる背面部５８ａと、背面部５８ａの右端から後方に延出する延出部５８ｂとを有し、上下方向の断面がＬ字状に屈曲されている。背面板５８は、背面部５８ａが天面板６０の拡幅部６０ａ間に位置する部分の後端に沿って、且つ延出部５８ｂが天面板６０の右拡幅部６０ａの左端に沿って、配設されている。背面部５８ａの上端、並びに延出部５８ｂの上端及び延出端は、天面板６０に溶接により接合されている。又、背面板５８の下端は底板３０の上面及び底面板６２の上面に、背面板５８の左端は左スカート板４０の内面に、夫々、溶接により接合されている。 The back plate 58 has a back surface portion 58a extending in the left-right direction and an extending portion 58b extending rearward from the right end of the back surface portion 58a, and the cross section in the vertical direction is bent in an L shape. The back plate 58 is disposed along the rear end of the portion where the back portion 58a is located between the widened portions 60a of the top plate 60, and the extended portion 58b is arranged along the left end of the right wide portion 60a of the top plate 60. Has been. The upper end of the back surface portion 58a and the upper end and the extended end of the extension portion 58b are joined to the top plate 60 by welding. The lower end of the back plate 58 is joined to the upper surface of the bottom plate 30 and the upper surface of the bottom plate 62, and the left end of the back plate 58 is joined to the inner surface of the left skirt plate 40 by welding.
底面板６２には、左右方向に細長く延びる第２のスリット６２ａが形成されている。底面板６２の延出端には、規制部材が天面板６０の規制部材取付穴６０ｃに取付けられる際に挿通される挿通穴６２ｂが形成されている。又、底面板６２の右端は底板３０の左端に、底面板６２の左端は左スカート板４０の内面に、夫々、溶接により接合されている。尚、第２のスリット６２ａと挿通穴６２ｂとは、図４に示すとおり連結されているが、連結されていなくてもよい。 The bottom plate 62 is formed with a second slit 62a that is elongated in the left-right direction. The extending end of the bottom plate 62 is formed with an insertion hole 62 b that is inserted when the restricting member is attached to the restricting member attaching hole 60 c of the top plate 60. The right end of the bottom plate 62 is joined to the left end of the bottom plate 30 and the left end of the bottom plate 62 is joined to the inner surface of the left skirt plate 40 by welding. The second slit 62a and the insertion hole 62b are connected as shown in FIG. 4, but may not be connected.
上述したとおりの、図１から図５までに示された油圧ショベル２の旋回フレーム２２の作用を説明する。本発明に係る旋回フレーム２２は、後キャブサポート部材３６ｂの天面板６０に左右方向に細長く延びる第１のスリット６０ｄが形成されているので、後キャブサポート部材３６ｂの捩じり荷重に対する剛性が低下される。又、第１のスリット６０ｄが左右方向に細長く延びるものであることから、後キャブサポート部材３６ｂは、天面板６０に第１のスリット６０ｄが形成されていない場合と比較して上下方向の断面係数の値の差が小さいため、曲げ荷重に対する剛性の低下が抑えられている。従って、本発明に係る旋回フレーム２２は、規制部材の作用を損なうことなく、捩じり荷重が作用したときに左スカート板４０に生ずる応力が分散され、左スカート板４０に亀裂が入ることが防止される。 The operation of the swing frame 22 of the excavator 2 shown in FIGS. 1 to 5 as described above will be described. In the revolving frame 22 according to the present invention, the first slit 60d elongated in the left-right direction is formed in the top plate 60 of the rear cab support member 36b, so that the rigidity of the rear cab support member 36b with respect to torsional load is reduced. Is done. Further, since the first slit 60d is elongated in the left-right direction, the rear cab support member 36b has a vertical section modulus as compared with the case where the first slit 60d is not formed on the top plate 60. Since the difference between the values is small, a decrease in rigidity against bending load is suppressed. Therefore, in the revolving frame 22 according to the present invention, the stress generated in the left skirt plate 40 when the torsional load is applied is dispersed without damaging the function of the regulating member, and the left skirt plate 40 is cracked. Is prevented.
又、本発明に係る旋回フレーム２２は、後キャブサポート部材３６ｂの底面板６２に左右方向に細長く延びる第２のスリット６２ａが形成されているので、後キャブサポート部材３６ｂの曲げ荷重に対する剛性の低下が抑えられつつ、後キャブサポート部材３６ｂの捩じり荷重に対する剛性が更に低下される。この結果、本発明に係る旋回フレーム２２は、捩じり荷重が作用したときに左スカート板４０に生ずる応力がより一層分散され、左スカート板４０に亀裂が入ることが防止される。 Further, in the revolving frame 22 according to the present invention, since the second slit 62a extending in the left-right direction is formed in the bottom plate 62 of the rear cab support member 36b, the rigidity of the rear cab support member 36b with respect to the bending load is reduced. The rigidity with respect to the torsional load of the rear cab support member 36b is further reduced. As a result, in the revolving frame 22 according to the present invention, the stress generated in the left skirt plate 40 when the torsional load is applied is further dispersed, and the left skirt plate 40 is prevented from cracking.
尚、前キャブサポートや後キャブサポート等のサポート部材の構造については、実施例において説明した構造に限定されるものではなく、例えば、前面板、背面板、天面板及び底面板とから左右方向の断面が矩形である箱型構造のような構造であってもよい。又、サポート部材を構成する各部材の形状についても、実施例において説明した形状に限定されるものではなく、各部材は、例えば、平板状の鋼板、左右方向の断面形状がＬ字状となるように屈曲加工された鋼板、左右方向の断面形状がコ字状となるように屈曲加工された鋼板等から形成されていてもよい。 The structure of the support member such as the front cab support and the rear cab support is not limited to the structure described in the embodiment. For example, the structure in the left-right direction from the front plate, the back plate, the top plate, and the bottom plate is used. A structure such as a box-shaped structure having a rectangular cross section may be used. Further, the shape of each member constituting the support member is not limited to the shape described in the embodiment, and each member is, for example, a flat steel plate, and a cross-sectional shape in the left-right direction is L-shaped. It may be formed from a steel plate that has been bent in this manner, a steel plate that has been bent so that the cross-sectional shape in the left-right direction becomes a U-shape, and the like.
２：油圧ショベル（建設機械）
２２：旋回フレーム
２４：キャブ
３０：底板
３２：左側に位置する縦板
３４：右側に位置する縦板
３６：左サポート部材
３６ａ：前キャブサポート部材
３６ｂ：後キャブサポート部材
３８：右サポート部材
４０：左スカート板
４２：右スカート板
５６：前面板
５８：背面板
６０：天面板
６０ａ：拡幅部
６０ｂ：防振マウント取付穴
６０ｃ：規制部材取付穴
６０ｄ：第１のスリット
６２：底面板
６２ａ：第２のスリット
６２ｂ：挿通穴
2: Excavator (construction machine)
22: Swivel frame 24: Cab 30: Bottom plate 32: Vertical plate located on the left side 34: Vertical plate located on the right side 36: Left support member 36a: Front cab support member 36b: Rear cab support member 38: Right support member 40: Left skirt plate 42: Right skirt plate 56: Front plate 58: Back plate 60: Top plate 60a: Widened portion 60b: Anti-vibration mount attachment hole 60c: Restriction member attachment hole 60d: First slit 62: Bottom plate 62a: First plate 2 slit 62b: insertion hole
Claims (3)
該複数の左サポート部材又は該複数の右サポート部材は、運転員が搭乗するキャブの後側を支持する後キャブサポート部材を含み、
該後キャブサポート部材は、前後方向に間隔をおいて配設された前面板及び背面板、該前面板の上端と該背面板の上端とに接続された天面板、並びに該前面板の下端と該背面板の下端とに接続された底面板を有し、
該天面板には左右方向に細長く延びる第１のスリットが形成され、該底面板には左右方向に細長く延びる第２のスリットが形成されている、ことを特徴とする建設機械の旋回フレーム。 A bottom plate, a pair of left and right vertical plates standing on the bottom plate and extending in the front-rear direction, a plurality of left support members extending leftward from the outer surface of the vertical plate located on the left side, and the right plate located on the right side A plurality of right support members extending rightward from the outer surface of the vertical plate, a left skirt plate connected to each of the extending ends of the plurality of left support members and extending in the front-rear direction, and the plurality of right support members In a turning frame of a construction machine comprising a right skirt plate connected to each of the extending ends and extending in the front-rear direction,
The plurality of left support members or the plurality of right support members include a rear cab support member that supports a rear side of a cab on which an operator rides,
The rear cab support member includes a front plate and a back plate disposed at intervals in the front-rear direction, a top plate connected to an upper end of the front plate and an upper end of the back plate, and a lower end of the front plate Having a bottom plate connected to the lower end of the back plate;
A swing frame for a construction machine , wherein the top plate is formed with a first slit extending in the left-right direction, and the bottom plate is formed with a second slit extending in the left-right direction .
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| JP6647997B2 (en) * | 2016-09-29 | 2020-02-14 | 日立建機株式会社 | Construction machinery |
| JP7128032B2 (en) | 2018-06-04 | 2022-08-30 | キャタピラー エス エー アール エル | construction machine frame |
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| JP2003082705A (en) * | 2001-09-10 | 2003-03-19 | Hitachi Constr Mach Co Ltd | Turning frame of construction machine and its of manufacturing method |
| JP4429595B2 (en) * | 2002-12-11 | 2010-03-10 | 株式会社小松製作所 | Cab support structure |
| JP4430970B2 (en) * | 2004-04-09 | 2010-03-10 | キャタピラージャパン株式会社 | Bumper structure for construction machinery |
| JP4369792B2 (en) * | 2004-04-12 | 2009-11-25 | キャタピラージャパン株式会社 | Welded structure of structure |
| JP4418328B2 (en) * | 2004-08-05 | 2010-02-17 | キャタピラージャパン株式会社 | Swivel frame structure |
| KR100689294B1 (en) * | 2005-07-25 | 2007-03-02 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Cab support vehicle frame structure preventing welding strain for construction machinery |
| KR100753991B1 (en) * | 2006-09-22 | 2007-08-31 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Upper frame structure of supporting cab of construction machine |
| DE112009000336B4 (en) * | 2008-02-27 | 2014-05-28 | Komatsu Ltd. | working vehicle |
| JP5939629B2 (en) * | 2012-05-23 | 2016-06-22 | キャタピラー エス エー アール エル | Construction machinery |
| JP2014000865A (en) * | 2012-06-18 | 2014-01-09 | Daihatsu Motor Co Ltd | Suspension device for vehicle |
-
2014
- 2014-10-17 JP JP2014213041A patent/JP6262118B2/en active Active
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2015
- 2015-10-16 CN CN201520798451.4U patent/CN205077540U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109891155B (en) * | 2016-10-31 | 2021-09-21 | 三菱电机株式会社 | Indoor unit and air conditioning device |
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| Publication number | Publication date |
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| CN205077540U (en) | 2016-03-09 |
| JP2016079709A (en) | 2016-05-16 |
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