US20240376689A1 - Work machine - Google Patents

Work machine Download PDF

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Publication number
US20240376689A1
US20240376689A1 US18/689,461 US202318689461A US2024376689A1 US 20240376689 A1 US20240376689 A1 US 20240376689A1 US 202318689461 A US202318689461 A US 202318689461A US 2024376689 A1 US2024376689 A1 US 2024376689A1
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United States
Prior art keywords
boss
counterweight
attachment base
boss member
attachment
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Pending
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US18/689,461
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English (en)
Inventor
Yuya TSUJIMOTO
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.)
Hitachi Construction Machinery Co Ltd
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Hitachi Construction Machinery Co Ltd
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Assigned to HITACHI CONSTRUCTION MACHINERY CO., LTD. reassignment HITACHI CONSTRUCTION MACHINERY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TSUJIMOTO, Yuya
Publication of US20240376689A1 publication Critical patent/US20240376689A1/en
Pending legal-status Critical Current

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    • 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
    • E02F9/18—Counterweights
    • 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

Definitions

  • the present invention relates to a work machine.
  • a hydraulic excavator includes an upper turning body turnably provided on an undercarriage traveling by crawlers and includes an articulated work front provided at a front portion of the upper turning body.
  • a counterweight is detachably attached to a rear portion of the upper turning body.
  • an attachment base 115 is provided at a rear portion of a frame 109 of the upper turning body, and a counterweight 113 is disposed on a rear side.
  • a boss portion 113 a provided to project from a front surface of the counterweight 113 is inserted into a boss hole 115 a of the attachment base 115 .
  • a bolt 122 is inserted from the front side into bolt holes 113 b and 115 b provided to penetrate through the counterweight 113 and the attachment base 115 and is screwed into a nut 123 , and the counterweight 113 is thereby fastened to the attachment base 115 .
  • a plate is fastened to the boss portion 113 a exposed forward via the boss hole 115 a with a bolt to prevent the boss portion 113 a from coming off backward from the boss hole 115 a.
  • a shear force due to the weight of the counterweight 113 is received by the firm boss portion 113 a , the weight of the counterweight 113 is supported by the attachment base 115 via the boss portion 113 a , and the shear force acting on the bolt 122 is thus reduced.
  • the attachment structure of the counterweight 113 will be referred to as a related art.
  • Such a counterweight 113 is detached from the attachment base 115 at the time of transport or the like of the hydraulic excavator, and a counterweight attachment/detachment device is used for the attachment/detachment work.
  • the counterweight attachment/detachment device is included at the rear portion of the upper turning body of the hydraulic excavator. Proximal ends of a pair of left and right rotating arms are axially supported by coupling pins at a rear portion of the frame of the upper turning body, and a coupling tool that can lock at a suspension ring of each counterweight is provided at a distal end of each rotating arm.
  • Each rotating arm is driven by an elevating cylinder and can rotate about the coupling pin between an attachment position at which the distal end is directed upward and a detachment position at which the distal end is directed backward.
  • the boss portion 113 a is inserted into the boss hole 115 a of the attachment base 115 , the bolt hole 113 b of the counterweight 113 coincides with the bolt hole 115 b of the attachment base 115 in an up-down direction at this time, fastening with the bolt 122 is thus achieved, and the bolt and the plate prevent the boss portion 113 a from falling out.
  • the boss 113 a causes deviation with respect to the attachment base 115 in the up-down direction and cannot be inserted. Therefore, the deviation state is checked, the counterweight 113 is then put down on the ground surface once, the suspension height is adjusted again with the adjustment bolt of the coupling tool, and attachment of the counterweight 113 is tried again.
  • the attachment structure of the counterweight 113 in the related art has a problem that a work of attachment to the hydraulic excavator is complicated.
  • the work of attachment should be able to be completed since it is possible to insert the boss portion 113 a of the counterweight 113 into the boss hole 115 a in the attachment base 115 at the suspension height as illustrated by the two-dotted chain line.
  • the boss portion 113 a provided to project forward interferes with the attachment base 115 before being inserted into the boss hole 115 a and prevents movement of the counterweight 113 .
  • the state means that an adjustment margin (an attachable up-down width) of the suspension height has decreased by the amount corresponding to the dimension A.
  • the present invention was made to solve such a problem, and an object thereof is to provide a work machine capable of enlarging an adjustment margin of a suspension height at the time of attachment of a counterweight to the work machine and facilitating an attachment work.
  • a work machine capable of detachably attaching a counterweight to an attachment base provided at a rear portion of a vehicle body, the work machine including: a boss hole that is provided to penetrate through the attachment base; a boss recessed portion that is formed in a front surface of the counterweight; a boss member that is inserted into the boss recessed portion in the counterweight from a front side via the boss hole in the attachment base, is fastened to the counterweight with a first fastening member, and has a lower surface abutting a lower wall inside the boss hole and an upper surface abutting an upper wall inside the boss recessed portion; and a second fastening member that fastens the counterweight to the attachment base.
  • FIG. 1 is a side view illustrating a hydraulic excavator to which an attachment structure of a counterweight according to an embodiment is applied.
  • FIG. 2 is a schematic view illustrating, in a lateral view, a state where attachment of the counterweight has been completed.
  • FIG. 3 is a perspective view illustrating a boss member, a pedestal, and a fixation metal fitting.
  • FIG. 4 is an exploded perspective view illustrating the boss member, the pedestal, and the fixation metal fitting.
  • FIG. 5 is a schematic view illustrating, in a lateral view, a state where a bolt hole of the counterweight is caused to coincide with a female screw hole in the boss member.
  • FIG. 6 is a schematic view illustrating, in a lateral view, a state where a bolt is screwed into the female screw hole in the boss member via the bolt hole of the counterweight.
  • FIG. 7 is a schematic view illustrating, in a lateral view, a state where the bolt is tightened and the boss member is withdrawn into a boss recessed portion of the counterweight.
  • FIG. 8 is a schematic view illustrating, in a lateral view, a state where a boss portion of a counterweight interferes with a support frame and re-adjustment is needed according to a related art.
  • FIG. 9 is a schematic view corresponding to FIG. 7 illustrating a boss member in another example with a flange portion omitted.
  • FIG. 1 is a side view illustrating the hydraulic excavator according to the present embodiment, and a schematic configuration of the hydraulic excavator will be described first on the basis of the drawing. Note that in the following description, front-rear, left-right, and up-down directions will be expressed from a viewpoint of an operator sitting in the hydraulic excavator.
  • a pair of left and right crawlers 3 are included in an undercarriage 2 of a hydraulic excavator 1 , and the crawlers 3 are driven by a hydraulic motor for traveling, which is not illustrated, and cause the hydraulic excavator 1 to travel.
  • An upper turning body 4 (corresponding to the “vehicle body” of the present invention) is provided on the undercarriage 2 , and the upper turning body 4 is driven and turned by a hydraulic motor for turning, which is not illustrated.
  • An articulated work front 5 is provided at a front portion of the upper turning body 4 , and the work front 5 is configured of a boom 6 , an arm 7 , and a bucket 8 .
  • An angle of the boom 6 is changed by a boom cylinder 6 a
  • an angle of the arm 7 is changed by an arm cylinder 7 a
  • an angle of the bucket 8 is changed by a bucket cylinder 8 a.
  • a driver's cabin 10 is provided at a front portion on a frame 9 of the upper turning body 4 , and various operation devices, which are provided in the driver's cabin 10 and are not illustrated, are operated by the operator.
  • a fuel tank 11 , a machine room 12 , a counterweight 13 , and the like are provided behind the driver's cabin 10 on the frame 9 , and although not illustrated, various devices such as an engine, a hydraulic pump driven by the engine, and a hydraulic circuit that switches an operating oil ejected from the hydraulic pump are mounted in the machine room 12 .
  • the operating oil from the hydraulic pump is switched by the hydraulic circuit in response to operations of the operation devices and is supplied to the aforementioned hydraulic motors for traveling and for turning and each of cylinders 6 c to 8 c of the work front 5 . In this manner, traveling of the hydraulic excavator 1 , turning of the upper turning body 4 , operating of the work front 5 , and the like are performed.
  • a pair of attachment bases 15 (one of the pair is illustrated in FIGS. 2 and 3 ) are provided at a rear end of the frame 9 of the upper turning body 4 at intervals in the left-right direction, and the counterweight 13 is attached to the hydraulic excavator 1 via the attachment bases 15 .
  • a counterweight attachment/detachment device 16 for attaching and detaching the counterweight 13 is included between the attachment bases 15 .
  • a configuration of the counterweight attachment/detachment device 16 is similar to the configuration described in Patent Document 1, for example, proximal ends of a pair of left and right rotating arms are axially supported by the attachment bases 15 at the rear portion of the frame 9 of the upper turning body 4 of the hydraulic excavator 1 with coupling pins, a coupling tool that can be locked at a suspension ring of the counterweight is provided at a distal end of each rotating arm, and each rotating arm is driven by an elevating cylinder and is configured to be rotatable about the coupling pin between an attachment position at which the distal end is directed upward and a detachment position at which the distal end is directed backward.
  • the counterweight 13 moves along an arc-shaped trajectory L (illustrated in FIG. 5 ) around the coupling pins and is attached to the attachment bases 15 .
  • the attachment structure for the counterweight 113 in the related art illustrated in FIG. 8 has a problem that there may be a case where the boss portion 113 a provided to project from the front surface of the counterweight 113 interferes with the attachment bases 115 and attachment cannot be achieved and re-adjustment of the suspension height may be needed.
  • the present inventor discovered a measure of preparing a boss member 18 , which is a component different from the counterweight 13 , instead of the boss portion 113 a and disposing the boss member 18 between the counterweight 13 and the attachment bases 15 after disposing the counterweight 13 at the attachment bases 15 . Details will be described below.
  • FIG. 2 is a schematic view illustrating, in a lateral view, a state where attachment of the counterweight 13 has been completed
  • FIG. 3 is a perspective view illustrating the boss member 18 , a pedestal, and a fixation metal fitting
  • FIG. 4 is an exploded perspective view illustrating the boss member 18 , the pedestal, and the fixation metal fitting. Note that although each drawing shows one of the left and right attachment bases 15 and the boss member 18 , the pedestal 17 , and the like related to the attachment base 15 , the other attachment base 15 and the like also have the same configurations.
  • the attachment base 15 has a plate shape facing the front side and the rear side and is provided to extend upward with a lower end thereof fixed to a rear end of the frame 9 of the upper turning body 4 .
  • the pedestal 17 is fixed on the front side of the attachment base 15 on the frame 9 , the pedestal 17 includes a guide surface 17 a that is parallel with an axis of a boss hole 15 a , which will be described later, faces the upper side, and has a quadrangular shape in a plan view and side walls 17 b and a front wall 17 c formed on both the left and right sides and the front side of the guide surface 17 a , and a rear end of the pedestal 17 abuts the attachment base 15 .
  • the boss member 18 is disposed on the guide surface 17 a of the pedestal 17 , and the boss member 18 includes a fitting insertion portion 18 a that extends in the front-rear direction and has a rectangular parallelepiped shape and a flange portion 18 b that is integrally formed at a front end of the fitting insertion portion 18 a and has a quadrangular plate shape.
  • the fitting insertion portion 18 a has a quadrangular shape (corresponding to the “square shape” of the present invention) seen from the rear side.
  • the entire lower surface of the boss member 18 abuts the guide surface 17 a , and the boss member 18 is movable in the front-rear direction by being guided by the guide surface 17 a .
  • a left-right width of the fitting insertion portion 18 a is set to be smaller than a left-right width of the flange portion 18 b
  • an up-down width of the fitting insertion portion 18 a is set to be smaller than an up-down width of the flange portion 18 b .
  • both the left and right sides and the upper side of the fitting insertion portion 18 a are surrounded by the flange portion 18 b in a view from the rear side, and the surrounding region of the flange portion 18 b will be referred to as an abutment surface 18 c below.
  • a fixation metal fitting 19 produced by folding and shaping a steel plate is disposed at the fitting insertion portion 18 a of the boss member 18 , has a recessed shape opened downward in a manner corresponding to a sectional shape of the fitting insertion portion 18 a , and is fitted into the fitting insertion portion 18 a from the upper side. Both ends of the fixation metal fitting 19 are fastened to the guide surface 17 a with bolts 20 , and the boss member 18 is fixed to the guide surface 17 a with the fixation metal fitting 19 . At the time of transport during which the counterweight 13 is detached from the hydraulic excavator 1 , the fixation metal fitting 19 is fastened to the pedestal 17 and serves to prevent the boss member 18 from falling out.
  • fixation metal fitting 19 Various structures can be employed as the fixation metal fitting 19 as long as it is possible to restrict movement of the boss member 18 .
  • movement in all of the front-rear direction, the left-right direction, and to the upper side may be restricted by pushing the boss member 18 against the guide surface 17 a with the fixation metal fitting 19 .
  • movement in the left-right direction and to the upper side may be restricted with the fixation metal fitting 19
  • movement to the front side may be restricted by the front wall 17 c
  • movement to the rear side may be restricted by causing the abutment surface 18 c of the flange portion 18 b to abut the fixation metal fitting 19 .
  • FIG. 5 is a schematic view illustrating, in a lateral view, a state where a bolt hole 13 b in the counterweight 13 is caused to coincide with a female screw 18 d hole in the boss member 18
  • FIG. 6 is a schematic view illustrating, in a lateral view, a state where a bolt is screwed into the female screw 18 d hole in the boss member 18 via the bolt hole 13 b in the counterweight 13
  • FIG. 7 is a schematic view illustrating, in a lateral view, a state where the bolt is tightened and the boss member 18 is withdrawn into a boss recessed portion 13 a of the counterweight 13 .
  • the boss hole 15 a with a quadrangular shape (corresponding to the “square shape” in the present invention) corresponding to the fitting insertion portion 18 a of the boss member 18 is provided to penetrate through the attachment base 15 , and a lower wall inside the boss hole 15 a is on the same plane as the guide surface 17 a of the pedestal 17 .
  • a distal end of the fitting insertion portion 18 a does not project backward from the inside of the boss hole 15 a and stays within the boss hole 15 a at a position of the boss member 18 caused to move to the frontmost side on the guide surface 17 a of the pedestal 17 (hereinafter, referred to as a front position).
  • the fitting insertion portion 18 a projects backward from the inside of the boss hole 15 a in the attachment base 15 as illustrated in FIG. 6 . If the boss member 18 further moves backward, the abutment surface 18 c of the flange portion 18 b abuts the front surface of the attachment base 15 as illustrated in FIG. 7 , and movement of the boss member 18 is restricted (hereinafter, referred to as a rear position).
  • the counterweight 13 is disposed behind the attachment base 15 , and the boss recessed portion 13 a with a quadrangular shape (corresponding to the “square shape” in the present invention) corresponding to the fitting insertion portion 18 a of the boss member 18 is formed in the front surface of the counterweight 13 .
  • the configuration will be described on the assumption that the counterweight 13 has been attached to the attachment base 15 as illustrated in FIG. 2 for convenience of explanation.
  • the boss member 18 is at the rear position, the abutment surface 18 c abuts the front surface of the attachment base 15 , and the fitting insertion portion 18 a is inserted into the boss recessed portion 13 a from the front side via the boss hole 15 a in the attachment base 15 .
  • a female screw 18 d is formed from the rear side at the fitting insertion portion 18 a of the boss member 18 , and the bolt hole 13 b is provided to penetrate through the counterweight 13 in the front-rear direction such that the bolt hole 13 b coincides with the female screw 18 d .
  • a bolt 21 (corresponding to the “first fastening member” in the present invention) is inserted into the bolt hole 13 b from the rear side, and a distal end thereof is screwed into the female screw 18 d of the boss member 18 .
  • the fitting insertion portion 18 a of the boss member 18 receives a fastening force of the bolt 21 and is withdrawn into and fastened to the boss recessed portion 13 a of the counterweight 13 .
  • the attachment base 15 is sandwiched between the abutment surface 18 c of the boss member 18 and the front surface of the counterweight 13 , and the counterweight 13 is attached to the attachment base 15 .
  • the up-down width of the boss hole 15 a in the attachment base 15 and the up-down width of the boss recessed portion 13 a of the counterweight 13 are set to be slightly larger as compared with the up-down width of the fitting insertion portion 18 a of the boss member 18 , and clearances in the up-down direction are formed therebetween, as illustrated in FIG. 2 .
  • the left-right width of the boss hole 15 a in the attachment base 15 and the left-right width of the boss recessed portion 13 a of the counterweight 13 are also set to be slightly larger as compared with the left-right width of the fitting insertion portion 18 a .
  • the present invention is not limited thereto, and the up-down width of each of the members 18 a , 15 a , and 13 a may be caused to coincide with each other, or the left-right width thereof may be caused to coincide with each other.
  • bolt holes 13 c and 15 b are provided to penetrate in the front-rear direction through the counterweight 13 and the attachment base 15 , respectively, at positions above the boss member 18 , and a bolt 22 (corresponding to the “second fastening member” in the present invention) is inserted into the bolt holes 13 c and 15 b from the rear side and are then screwed into a nut 23 welded on the front surface of the attachment base 15 .
  • a bolt 22 corresponding to the “second fastening member” in the present invention
  • the counterweight 13 configured as described above is attached and detached by the counterweight attachment/detachment device 16 .
  • the rotating arms of the counterweight attachment/detachment device 16 is brought into an attachment position, each coupling tool is locked at and suspended from the suspension ring, which is not illustrated, and fastening of the bolt 21 and the bolt 22 is then released.
  • the counterweight 13 Since the counterweight 13 is detached along the arc-shaped trajectory L around the coupling pins, movement thereof may be prevented by the boss member 18 at the rear position. Thus, the removed bolt 21 is inserted into the bolt hole 13 b in the counterweight 13 , and the boss member 18 is pushed with the distal end of the bolt hole 13 b and is caused to move to the front position, for example. If the rotating arms of the counterweight attachment/detachment device 16 is caused to rotate to a detachment position, then the counterweight 13 is moved to and placed on the ground surface.
  • the fixation metal fitting 19 is fastened to the pedestal 17 to fix the boss member 18 .
  • vibration at the time of the transport acts on the boss member 18 , it is possible to prevent such a situation in which the boss member 18 falls out from the pedestal 17 before it happens.
  • the rotating arms of the counterweight attachment/detachment device 16 are brought into a removal position, the suspension height of the counterweight 13 is roughly adjusted by an adjustment bolt of each coupling tool, and locked at the suspension ring. If the rotating arms are caused to rotate to the attachment position, the counterweight 13 is suspended and moves to the attachment base 15 along the arc-shaped trajectory L as illustrated in FIG. 5 .
  • a positional relationship in the up-down direction between the fitting insertion portion 18 a of the boss member 18 and the boss recessed portion 13 a of the counterweight 13 (and thus a positional relationship in the up-down direction between the female screw 18 d and the bolt hole 13 b ) gradually changes with movement of the counterweight 13 .
  • the fitting insertion portion 18 a and the boss recessed portion 13 a coincide with each other in the up-down direction at some point before the front surface of the counterweight 13 abuts the rear surface of the attachment base 15 .
  • a worker looks into the bolt hole 13 b in the counterweight 13 from the rear side, checks the positional relationship between the bolt hole 13 b and the female screw 18 d of the boss member 18 , and stops the movement of the counterweight 13 at the point when the bolt hole 13 b and the female screw 18 d coincide with each other.
  • the bolt 21 is inserted into the bolt hole 13 b in the counterweight 13 from the rear side, and the distal end thereof is screwed into and temporarily fastened to the female screw 18 d of the boss member 18 as illustrated in FIG. 6 .
  • the boss member 18 at the front position moves to the rear position while being guided by the guide surface 17 a with the tightening of the bolt 21 , and the fitting insertion portion 18 a of the boss member 18 is withdrawn into the boss recessed portion 13 a of the counterweight 13 as illustrated in FIG. 7 .
  • the abutment surface 18 c of the boss member 18 abuts the front surface of the attachment base 15
  • the front surface of the counterweight 13 abuts the rear surface of the attachment base 15 .
  • the bolt 22 is inserted into the bolt holes 13 c and 15 b in the counterweight 13 and the attachment base 15 from the rear side, and the distal end thereof is screwed into and temporarily fastened to the nut 23 . Then, once the suspension of the counterweight 13 by the counterweight attachment/detachment device 16 is stopped, the weight of the counterweight 13 acts on the boss member 18 and is supported by the attachment base 15 via the boss member 18 . If the bolt 21 and the bolt 22 are actually fastened in this state, the counterweight 13 is attached to the attachment base 15 , and the series of attachment work is completed.
  • the boss member 18 is a component separated from the counterweight 13 , and the front surface thereof does not include the boss portion 113 a provided to project therefrom like the counterweight 113 in the related art illustrated in FIG. 8 , for example, and has a flat shape.
  • FIGS. 5 and 8 illustrate cases where the respective counterweights 13 and 113 are adjusted to the same suspension height.
  • the boss portion 113 a provided to project forward interferes with the attachment base 115 before insertion into the boss hole 115 a and prevents movement of the counterweight 113 when the counterweight 113 is caused to move along the arc-shaped trajectory L for attachment to the attachment base 115 . Therefore, re-adjustment to adjust the suspension height upward is needed.
  • a site corresponding to the boss member 18 is not present, and it is thus possible to cause the counterweight 13 to move with any problem along the arc-shaped trajectory L to the up-down position at which the boss recessed portion 13 a coincides with the fitting insertion portion 18 a of the boss member 18 .
  • the fitting insertion portion 18 a of the boss member 18 is withdrawn into the boss recessed portion 13 a through screwing of the bolt 21 after the fitting insertion portion 18 a and the boss recessed portion 13 a are caused to coincide with each other, it is possible to cause the attachment base 15 to support the weight of the counterweight 13 via the boss member 18 .
  • it is possible to expand downward an adjustment margin of the suspension height by the amount corresponding to the dimension A in FIG. 8 to reduce opportunities in which re-adjustment is needed, and thereby to facilitate the attachment work of the counterweight 13 .
  • the up-down width of the boss recessed portion 13 a of the counterweight 13 is set to be larger than the up-down width of the fitting insertion portion 18 a of the boss member 18 , and clearances in the up-down direction are formed therebetween in the present embodiment. Therefore, it is possible to insert the fitting insertion portion 18 a into the boss recessed portion 13 a even in a case where the suspension height slightly deviates upward. As a result, it is not necessary to perform re-adjustment to adjust the suspension height downward again in this case, and this point also significantly contributes to the facilitating of the attachment work.
  • the bolt 21 is screwed into the female screw 18 d of the boss member 18 from the rear side via the bolt hole 13 b in the counterweight 13 .
  • the fitting insertion portion 18 a of the boss member 18 is withdrawn into the boss recessed portion 13 a of the counterweight 13 , and the attachment base 15 is sandwiched between the abutment surface of the boss member 18 and the front surface of the counterweight 13 .
  • the pedestal 17 is fixed to the front side of the attachment base 15 on the frame 9 , and the boss member 18 is disposed on the guide surface 17 a formed on the pedestal 17 and facing the upper side, to thereby guide the movement in the front-rear direction.
  • the boss member 18 is guided on the guide surface 17 a , it is possible to significantly reduce a work requiring such a large effort. Additionally, it is possible to withdraw the boss member 18 into the boss recessed portion 13 a of the counterweight 13 merely by screwing the bolt 21 into the boss member 18 and tightening the bolt 21 thereto from the rear side.
  • the bolt 22 it is only necessary to screw the bolt 22 into the nut 23 via the bolt holes 13 c and 15 b in the counterweight 13 and the attachment base 15 from the rear side, and fastening of the counterweight 13 to the attachment base 15 is completed only by such a simple operation.
  • the attachment structure of the present embodiment it is possible to complete all the works at the time of attaching the counterweight 13 at the rear position of the upper turning body 4 as is obvious from the above description.
  • the work of disposing the counterweight 13 at a prescribed position on the attachment base 15 by using the counterweight attachment/detachment device 16 can be performed at the rear position of the upper turning body 4 , the fastening operation of the bolt 21 and the bolt 22 can also be performed at the rear position of the upper turning body 4 .
  • the machine room 12 is defined on the front side of the attachment base 15 on the frame 9 , and a maintenance opening portion, which is not illustrated, is formed in the frame 9 to open downward for maintenance of the machine room 12 . Therefore, the worker performs the operation of fastening the bolt 122 (illustrated in FIG. 8 ) or the operation of inserting the boss member 18 (illustrated in FIG. 7 ) as described above with his/her upper body placed in the machine room 12 from the maintenance opening portion. However, since the worker keeps a half-sitting posture at this time and performs the works while avoiding various devices that may be obstacles inside the machine room 12 , the works are very complicated.
  • the work can be performed in a natural standing posture, and there are no obstacles and the like that may disturb the works in the surroundings of the counterweight 13 .
  • the fitting insertion portion 18 a of the boss member 18 has a quadrangular shape in a view from the rear side, and the boss hole 15 a of the attachment base 15 and the boss recessed portion 13 a of the counterweight 13 have quadrangular shapes corresponding to the shape of the boss member 18 , relative rotation is restricted.
  • a rotation force acts on the boss member 18 at the time of fastening of the bolt 21
  • the rotation of the boss member 18 at this time is restricted by the boss hole 15 a in the attachment base 15 and the boss recessed portion 13 a of the counterweight 13 , it is possible to easily fasten the bolt 21 , and this point also significantly contributes to the facilitating of the attachment work.
  • both the boss hole 15 a in the attachment base 15 and the boss recessed portion 13 a of the counterweight 13 be formed into quadrangular shapes. Since the rotation of the boss member 18 can be restricted if any one of the members 15 a and 13 a is formed into a quadrangular shape, the other member may be formed into another shape into which the fitting insertion portion 18 a can be inserted. Also, the shape of each of the members 18 a , 15 a , and 13 a is not necessarily quadrangular shape in a view from the rear side and may be changed to another shape that enables rotation to be restricted. Furthermore, rotation is not necessarily restricted, the shapes may be circular shapes, for example, and such cases are also included in the present invention.
  • the present invention is implemented as the attachment structure for the counterweight 13 of the hydraulic excavator 1 in the above embodiment, for example, the present invention is not limited thereto.
  • the present invention can be applied to various work machines to which a counterweight is detachably attached and may be implemented as an attachment structure for a counterweight of a hydraulic crane, for example.
  • a bolt hole may be provided to penetrate through the boss member 18 in the front-rear direction
  • a female screw may be formed inside the boss recessed portion 13 a of the counterweight 13 in a manner corresponding to the bolt hole, and a bolt may be screwed into the female screw inside the boss recessed portion 13 a from the front side via the bolt hole of the boss member 18 .
  • the flange portion 18 b is formed at the boss member 18 in the above embodiment, the flange portion 18 b may be omitted as illustrated in FIG. 9 , for example.
  • the bolt 21 in this case does not play a role in fastening the counterweight 13 to the attachment base 15 , the fastening function is achieved by the bolt 22 and the nut 23 , and no problems will occur.
  • the pedestal 17 may be omitted.
  • the lower surface of the boss member 18 is formed to be flat on the assumption of disposition on the guide surface 17 a in the above embodiment, there is no need thereof, and the flange portion 18 b may be formed to extend on the lower side as well in addition to both the left and right sides and the upper sides and may be caused to function as the abutment surface 18 c.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Component Parts Of Construction Machinery (AREA)
US18/689,461 2022-03-23 2023-03-23 Work machine Pending US20240376689A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2022-046570 2022-03-23
JP2022046570 2022-03-23
PCT/JP2023/011401 WO2023182406A1 (ja) 2022-03-23 2023-03-23 作業機

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US20240376689A1 true US20240376689A1 (en) 2024-11-14

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