EP2184409B1 - Cadre-porteur d'une machine de construction - Google Patents

Cadre-porteur d'une machine de construction Download PDF

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Publication number
EP2184409B1
EP2184409B1 EP09174301.3A EP09174301A EP2184409B1 EP 2184409 B1 EP2184409 B1 EP 2184409B1 EP 09174301 A EP09174301 A EP 09174301A EP 2184409 B1 EP2184409 B1 EP 2184409B1
Authority
EP
European Patent Office
Prior art keywords
rotating frame
bottom plate
hydraulic
swing cylinder
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09174301.3A
Other languages
German (de)
English (en)
Other versions
EP2184409A2 (fr
EP2184409A3 (fr
Inventor
Eiji Maeba
Isao Miyachi
Asuka Ushiroguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobelco Construction Machinery Co Ltd
Original Assignee
Kobelco Construction Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobelco Construction Machinery Co Ltd filed Critical Kobelco Construction Machinery Co Ltd
Publication of EP2184409A2 publication Critical patent/EP2184409A2/fr
Publication of EP2184409A3 publication Critical patent/EP2184409A3/fr
Application granted granted Critical
Publication of EP2184409B1 publication Critical patent/EP2184409B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E02F3/325—Backhoes of the miniature type
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/08—Superstructures; Supports for superstructures
    • E02F9/0808—Improving mounting or assembling, e.g. frame elements, disposition of all the components on the superstructures
    • E02F9/0825—Cast frame structure

Definitions

  • JP 2005-002572 A and JP 2007-303129 A disclose a frame structure in which the rotating frame and the reinforcing ribs are integrally formed by casting to provide sufficient strength and rigidity.
  • JP2007-303129A discloses a frame structure according to the preamble of claim 1.
  • a hydraulic tube which connects the hydraulic pump to a control valve and a pilot tube which connects an operation lever to the control valve are disposed such that the tubes extend above the engine in an engine room.
  • tube insertion holes may be formed in the reinforcing ribs, so that the hydraulic tube can be inserted through the tube insertion holes.
  • the rotating frame and the reinforcing ribs are formed integrally with each other by casting, it is difficult to form the tube insertion holes in the reinforcing ribs.
  • cores are placed in a mold unit at positions corresponding to the tube insertion holes in the reinforcing ribs before molten metal is poured into the mold unit. Thus, the metal is prevented from flowing into the tube insertion holes. Then, the cores are removed after the casting process so that the tube insertion holes are formed. In this case, additional processes of placing and removing the cores are required, and the number of processes to be performed is increased.
  • the tube insertion holes may also be formed in the reinforcing ribs by machining after the rotating frame and the reinforcing ribs are formed integrally with each other by casting without using the cores. However, also in this case, the number of processes to be performed is increased.
  • An object of the present invention is to provide a frame structure of a construction machine in which tube insertion holes may be easily formed in reinforcing ribs without using cores in the process of forming the rotating frame and the reinforcing ribs integrally with each other by casting.
  • the present invention can be applied to a frame structure of a construction machine including a lower travelling body and an upper rotating body mounted on the lower travelling body such that the upper rotating body is rotatable.
  • a communication hole which communicates with the entire tube insertion hole with respect to a direction in which the reinforcing rib extends is provided in the bottom plate of the rotating frame such that the communication hole extends through the bottom plate of the rotating frame in a thickness direction thereof at a position corresponding to the tube insertion hole.
  • the rotating frame is disposed in the lower section of the upper rotating body.
  • the rotating frame is formed integrally with the reinforcing rib which stands upright on the bottom plate of the rotating frame and extends in the front-rear direction by casting.
  • the tube insertion hole is formed in the base portion of the reinforcing rib in the standing direction thereof such that the tube insertion hole extends through the base portion of the reinforcing rib in the thickness direction thereof.
  • the communication hole which communicates with the tube insertion hole is formed in the bottom plate of the rotating frame such that the communication hole extends through the bottom plate of the rotating frame in a thickness direction thereof at a position corresponding to the tube insertion hole.
  • the hydraulic pump and the control valve are disposed on the rotating frame at opposite sides of the reinforcing rib in the width direction of the rotating frame.
  • the hydraulic pump and the control valve are connected to each other by the hydraulic tube, and the hydraulic tube is inserted through the tube insertion hole in the reinforcing rib.
  • a core is placed in a mold unit at a position corresponding to the tube insertion hole in the reinforcing rib before molten metal is poured into the mold unit.
  • the metal is prevented from flowing into the tube insertion hole.
  • the core is removed after the casting process so that the tube insertion hole is formed.
  • additional processes of placing and removing the core are required, and the number of processes to be performed is increased.
  • the hydraulic tube which connects the hydraulic pump and the control valve to each other, such that the hydraulic tube extends along the top surface of the bottom plate of the rotating frame
  • the hydraulic tube can be viewed through the communication hole and can also be held through the communication hole. Therefore, the hydraulic tube can be easily inserted through the tube insertion hole.
  • the hydraulic tube and other tubes such as a pilot tube, can be arranged such that they are spaced from each other in the height direction. Therefore, the tubes can be prevented from overlapping each other and a sufficiently large working space can be provided for maintenance of the construction machine. As a result, the work efficiency can be improved.
  • the frame structure further includes a front attachment provided in a front section of the rotating frame, a swing cylinder which swings the front attachment in a left-right direction, and a swing cylinder bracket which supports a base end portion of the swing cylinder such that the base and portion of the swing cylinder is rotatable.
  • the swing cylinder bracket is positioned above the bottom plate of the rotating frame with a gap provided between the swing cylinder bracket and the bottom plate, and is formed integrally with the rotating frame by casting.
  • the hydraulic tube extends through the gap.
  • a through hole which communicates with the gap is provided in the bottom plate of the rotating frame such that the through hole extends through the bottom plate of the rotating frame in the thickness direction thereof at a position corresponding to the gap.
  • the hydraulic tube in the process of placing the hydraulic tube such that the hydraulic tube extends along the top surface of the bottom plate of the rotating frame, the hydraulic tube can be viewed through the through hole and can also be held through the through hole. As a result, the hydraulic tube can be easily inserted through the gap below the swing cylinder bracket.
  • Fig. 1 is a side view illustrating the structure of a construction machine 1 according to the embodiment of the present invention
  • Fig. 2 is a perspective view of an upper rotating body 30 viewed from the rear.
  • the construction machine 1 is a so-called mini excavator, which is a small, canopy-type excavator including a lower travelling body 20 to which crawlers 21 and 21 are attached and the upper rotating body 30 which is mounted on the lower travelling body 20 such that the upper rotating body 20 is rotatable.
  • the construction machine 1 is structured as an excavator with a short rear swing radius so that a rotation radius of a rear end of the upper rotating body 30 is substantially within the width of the lower travelling body 20.
  • An opening which functions as an entrance which allows the operator to get to the driver's seat 5 is provided in a left front section of the driving space A, and a floor F having an irregular surface is provided to prevent slipping and to allow the operator to scrape off the dirt on the bottom of the shoes.
  • control boxes 6, which are used for performing various control operations, are provided on the left and right sides of the driver's seat 5.
  • Operation levers 7 used to operate the front attachment 10 are provided at front ends of the control boxes 6.
  • a front canopy column 25, a rear canopy column 26, and a side canopy column 27 are provided so as to surround the driver's seat 5 at a right front position, a right rear position, and a left side position (side at which the entrance is provided), respectively, of the driver's seat 5.
  • a roof 28 for protecting the operator from falling objects is attached to the front canopy column 25, the rear canopy column 26, and the side canopy column 27 at the top ends thereof. Thus, the roof 28 is supported above the driver's seat 5.
  • the rotating frame 31 is a characteristic part of the present invention.
  • Figs. 3 and 4 are a perspective view and a plan view, respectively, illustrating the structure of the rotating frame 31.
  • Fig. 5 is a plan view of the rotating frame 31 viewed from below.
  • the rotating frame 31 is a support structure on which the engine 40, a hydraulic pump 43, a control valve 44, etc., are mounted.
  • the engine 40 serves as a drive source.
  • the hydraulic pump 43 ejects working oil
  • the control valve 44 controls an operation of supplying the working oil ejected from the hydraulic pump 43.
  • the rotating frame 31 is obtained by integrally casting a flat bottom plate 32, peripheral walls including a front wall 32a, a rear wall 32b, a left side wall 32c, and a right side wall 32d which respectively stand upright on the bottom plate 32 at the front, rear, left, and right sides thereof, and supporting brackets 35 which support the engine 40.
  • a swivel joint 50 is disposed at the center of rotation of the rotating frame 31.
  • the swivel joint 50 is provided to connect hydraulic tubes 45 disposed in the upper rotating body 30 and the lower travelling body 20 to each other.
  • the swivel joint 50 rotates in association with the rotation of the upper rotating body 30, so that the hydraulic tubes 45 can be held without being twisted.
  • Reinforcing ribs 34 stand upright on the bottom plate 32 of the rotating frame 31 at left and right sides of a central section of the bottom plate 32 in a width direction thereof.
  • the reinforcing ribs 34 extend in different directions from an area near the swing post 14 on the front wall 32a toward the rear wall 32b.
  • the reinforcing ribs 34 are formed integrally with the bottom plate 32 by casting, and ensure the strength and rigidity against an excavation load applied in an excavation process.
  • Communication holes 34b which communicate with the tube insertion holes 34a are formed in the bottom plate 32 of the rotating frame 31 at positions corresponding to the tube insertion holes 34a such that the communication holes 34b extend through the bottom plate 32 in the height direction thereof. Since the communication holes 34b are formed, in the casting process for forming the rotating frame 31 and the reinforcing ribs 34 integrally with each other, the tube insertion holes 34a can be easily formed simply by separating upper and lower molds from each other without placing cores at positions corresponding to the tube insertion holes 34a.
  • the engine 40 (see Fig. 1 ) is mounted on a rear section of the rotating frame 31.
  • the engine 40 is supported by the supporting brackets 35 with the engine mounts 41 interposed therebetween.
  • the engine mounts 41 are composed of elastic bodies made of resin, rubber, or the like. The engine mounts 41 absorb vibrations of the engine 40 and suppress the vibrations from being transmitted to the rotating frame 31.
  • the supporting brackets 35 are formed integrally with the rotating frame 31 by casting.
  • Each of the supporting brackets 35 includes an upright portion 35a which stands upright on the bottom plate 32 of the rotating frame 31 and a flat portion 35b which protrudes horizontally from a top end of the upright portion 35a.
  • the flat portion 35b of each supporting bracket 35 has a bolt insertion hole 35c through which a bolt 42 is inserted.
  • Through holes 36 are formed in the bottom plate 32 of the rotating frame 31 at positions where the through holes 36 overlap the flat portions 35b of the supporting brackets 35 in plan view.
  • the though hole 36 which corresponds to the flat portions 35b at the left front and right front positions extend between the left and right reinforcing ribs 34 such that the swivel joint 50 can be viewed through the through hole 36.
  • the though hole 36 which corresponds to the flat portions 35b at the left rear and right rear positions is surrounded by the rear wall 32b and the left and right reinforcing ribs 34 such that the engine 40 can be viewed through the through hole 36.
  • the through holes 36 are formed in the bottom plate 32 of the rotating frame 31 at positions where the through holes 36 overlap the flat portions 35b of the supporting brackets 35 in plan view. The reason for this will now be described.
  • the rotating frame 31 and the supporting brackets 35 are formed integrally with each other by casting, if there are portions, such as the flat portions 35b of the supporting brackets 35, which protrude in the horizontal direction, the following problem occurs. That is, in the step of pouring molten metal into the mold unit obtained by assembling the upper mold and the lower mold together, the metal flows into gaps between the bottom plate 32 of the rotating frame 31 and the flat portions 35b of the supporting brackets 35. Therefore, in the step of separating the upper and lower molds from each other in the vertical direction to release the rotating frame 31, the molds cannot be separated from each other in the vertical direction. The metal can be prevented from flowing into the above-described gaps by placing cores at the positions corresponding to the gaps. Then, the cores can be removed after the casting process. However, in this case, additional processes of placing and removing the cores are required, and the number of processes to be performed is increased.
  • a lower mold having bulging portions at positions corresponding to the gaps is used instead of placing the cores at the positions corresponding to the gaps between the bottom plate 32 of the rotating frame 31 and the flat portions 35b of the supporting brackets 35. Therefore, after the molten metal is poured into the mold unit obtained by assembling the upper mold and the lower mold together, the upper and lower molds can be separated from each other in the vertical direction to release the rotating frame 31. At this time, the through holes 36 are formed in the bottom plate 32 of the rotating frame 31 in areas corresponding to the bulging portions, and the upper and lower molds can be smoothly separated from each other. Therefore, it is not necessary to place or remove the cores, and the process of forming the rotating frame 31 and the supporting brackets 35 integrally with each other can be facilitated.
  • Top surfaces of the four guide portions 37 disposed at the left front, right front, left rear, and right rear positions of the rotating frame 31 are positioned on the same plane, and serve as reference surfaces in the process of cutting the rotating frame 31.
  • the rotating frame 31 is formed by casting, it is necessary to perform a cutting process for portions, such as the flat portions 35b of the supporting brackets 35, which are required to be flat.
  • the rotating frame 31 is placed upside down on a workbench (not shown) such that the top surfaces of the guide portions 37 face downward.
  • the cutting process for the above-mentioned portions can be performed while the flatness is ensured.
  • the cutting process can be performed with high accuracy.
  • the guide portions 37 which provide reference surfaces, are provided at four positions in the rotating frame 31. However, the flatness can be ensured in the cutting process as long as the guide portions 37 are provided at two or more positions.
  • the lower swing cylinder bracket 39 is positioned above the bottom plate 32 of the rotating frame 31 with a predetermined gap therebetween.
  • the upper swing cylinder bracket 39 is shaped such that the upper swing cylinder bracket 39 protrudes horizontally outward from the top edge portion of the left reinforcing rib 34.
  • the hydraulic tubes 45 which connect the hydraulic pump 43 and the control valve 44 to each other, such that the hydraulic tubes 45 extend along the top surface of the bottom plate 32 of the rotating frame 31, the hydraulic tubes 45 can be viewed through the communication holes 34b and can also be held through the communication holes 34b. Therefore, the hydraulic tubes 45 can be easily inserted through the tube insertion holes 34a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Component Parts Of Construction Machinery (AREA)

Claims (1)

  1. Structure de cadre pour une machine de construction (1) comportant un corps mobile inférieur (20) et un corps rotatif supérieur (30) qui est monté sur le corps mobile inférieur (20) de sorte que le corps rotatif supérieur (30) puisse tourner, où la structure de cadre comprend
    un cadre rotatif (31) pouvant être disposé dans une section inférieure du corps rotatif supérieur (30) et comportant une plaque de fond (32),
    un équipement avant (10) prévu dans une section avant du cadre rotatif (31),
    une nervure de renforcement (34) qui se tient en position verticale sur la plaque de fond (32) du cadre rotatif (31) et s'étend dans une direction avant-arrière, où le cadre rotatif (31) et la nervure de renforcement (34) sont formés d'un seul tenant l'un(e) avec de l'autre par coulée, et
    une pompe hydraulique (40) et une soupape de commande (44) disposées sur le cadre rotatif (31) à des côtés opposés de la nervure de renforcement (34) dans une direction de largeur du cadre rotatif (31), la pompe hydraulique (40) éjectant de l'huile de travail, la soupape de commande (44) étant reliée à la pompe hydraulique (40) par un tube hydraulique (45) et commandant une opération d'alimentation en huile de travail éjectée de la pompe hydraulique (40), caractérisée en ce que
    un trou d'insertion de tube (34a) à travers lequel le tube hydraulique (45) s'étend est prévu dans une partie de base de la nervure de renforcement (34) dans une direction droite de celle-ci de sorte que le trou d'insertion de tube (34a) s'étende à travers la partie de base de la nervure de renforcement (34) dans une direction d'épaisseur de celle-ci, et
    un trou de communication (34b) qui communique avec le trou d'insertion de tube (34a) est prévu dans la plaque de fond (32) du cadre rotatif (31) de sorte que le trou de communication (34b) s'étende à travers la plaque de fond (32) du cadre rotatif (31) dans une direction d'épaisseur de celui-ci à une position correspondant au trou d'insertion de tube (34a), où la structure de cadre comprend en outre :
    un vérin de pivotement (15a) qui fait pivoter l'équipement avant (10) dans une direction gauche-droite ; et
    un support de vérin de pivotement (39) qui supporte une partie d'extrémité de base du vérin de pivotement (15a) de sorte que la partie d'extrémité de base du vérin de pivotement (15a) puisse tourner,
    où le support de vérin de pivotement (39) est positionné au-dessus de la plaque de fond (32) du cadre rotatif (31) avec un espace prévu entre le support de vérin de pivotement (15) et la plaque de fond (32) et est formé d'un seul tenant avec le cadre rotatif (31) par coulée, le tube hydraulique (45) s'étendant à travers l'espace, et
    où un trou traversant (36) qui communique avec l'espace est prévu dans la plaque de fond (32) du cadre rotatif (31) de sorte que le trou traversant (36) s'étende à travers la plaque de fond (32) du cadre rotatif (31) dans la direction d'épaisseur de celui-ci à une position correspondant à l'espace.
EP09174301.3A 2008-11-11 2009-10-28 Cadre-porteur d'une machine de construction Not-in-force EP2184409B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008289132A JP4623203B2 (ja) 2008-11-11 2008-11-11 建設機械のフレーム構造

Publications (3)

Publication Number Publication Date
EP2184409A2 EP2184409A2 (fr) 2010-05-12
EP2184409A3 EP2184409A3 (fr) 2014-01-15
EP2184409B1 true EP2184409B1 (fr) 2015-08-26

Family

ID=41480370

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09174301.3A Not-in-force EP2184409B1 (fr) 2008-11-11 2009-10-28 Cadre-porteur d'une machine de construction

Country Status (2)

Country Link
EP (1) EP2184409B1 (fr)
JP (1) JP4623203B2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102383796B (zh) * 2011-09-26 2014-06-18 三一重型装备有限公司 一种回转机构及掘进机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2659563B2 (ja) * 1988-09-03 1997-09-30 ヤンマーディーゼル株式会社 旋回形建設機械のフレーム構造
JP3547239B2 (ja) * 1995-12-08 2004-07-28 株式会社クボタ 旋回作業機
JPH09177133A (ja) * 1995-12-27 1997-07-08 Hitachi Constr Mach Co Ltd 作業機械の旋回体構造
JP3956907B2 (ja) * 2003-06-24 2007-08-08 コベルコ建機株式会社 小型ショベル
EP1659225B1 (fr) * 2004-11-19 2017-08-23 Kubota Corporation Engin de travaux publics à tourelle tournante
JP2006200313A (ja) * 2005-01-24 2006-08-03 Hitachi Constr Mach Co Ltd 建設機械
JP2006336351A (ja) * 2005-06-03 2006-12-14 Shin Caterpillar Mitsubishi Ltd ショベル系建設機械におけるバッテリ
JP2007303129A (ja) * 2006-05-10 2007-11-22 Hitachi Constr Mach Co Ltd 建設機械

Also Published As

Publication number Publication date
EP2184409A2 (fr) 2010-05-12
EP2184409A3 (fr) 2014-01-15
JP4623203B2 (ja) 2011-02-02
JP2010116686A (ja) 2010-05-27

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