JP3947009B2 - Construction machine swivel frame - Google Patents

Construction machine swivel frame Download PDF

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Publication number
JP3947009B2
JP3947009B2 JP2002010238A JP2002010238A JP3947009B2 JP 3947009 B2 JP3947009 B2 JP 3947009B2 JP 2002010238 A JP2002010238 A JP 2002010238A JP 2002010238 A JP2002010238 A JP 2002010238A JP 3947009 B2 JP3947009 B2 JP 3947009B2
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Japan
Prior art keywords
plate
frame
vertical plates
vertical
partition
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JP2002010238A
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Japanese (ja)
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JP2003213727A (en
Inventor
誠 久野
肇 吉田
一徳 山田
誠 本図
直洋 石川
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日立建機株式会社
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Priority to JP2002010238A priority Critical patent/JP3947009B2/en
Publication of JP2003213727A publication Critical patent/JP2003213727A/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swing frame for a construction machine that is preferably used for a hydraulic excavator that performs excavation work such as earth and sand, and more particularly to a swing frame for a construction machine in which the swing radius of an upper swing body is reduced.
[0002]
[Prior art]
In general, a construction machine such as a hydraulic excavator includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided on the front portion of the upper revolving body so as to be able to move up and down. The excavation work such as earth and sand is performed by operating the working device.
[0003]
An upper swing body of such a hydraulic excavator includes a swing frame attached to the lower traveling body via a swing wheel, a cab or canopy provided on the swing frame and defining a cab, and the cab or An exterior cover that is located on the rear side of the canopy and is provided on the revolving frame and houses an engine, a hydraulic pump, and the like as a prime mover, and a rear cover that is located on the rear side of the exterior cover and is provided on the revolving frame. And a counterweight that balances the weight of the working device.
[0004]
In addition, in the case of a small hydraulic excavator, with the boom, arm, bucket, etc. of the work device folded, the work device is housed in the turning radius of the upper swing body together with the counterweight, and swiveled at a narrow work site. A so-called small swing type hydraulic excavator having a configuration capable of performing the above is known (for example, JP-A-11-303139).
[0005]
A turning frame of a small turning type hydraulic excavator according to this type of prior art will be described with reference to FIGS.
[0006]
In the figure, reference numeral 101 denotes a revolving frame of an upper revolving body according to the prior art. The revolving frame 101 includes a bottom plate 102 formed in a substantially disc shape as shown in FIG. 6, front vertical plates 103 and 104 described later, It consists of vertical plates 105, 106, a partition plate 107, a horizontal plate 108, and the like.
[0007]
103 and 104 are left and right front vertical plates erected on the front upper surface side of the bottom plate 102 using welding means, and the front vertical plates 103 and 104 are formed using a plate material such as a steel plate, for example. As shown in FIG. 7, the upper end side protrudes upward in a substantially triangular shape. The front vertical plates 103 and 104 are parallel to each other on the front side of the bottom plate 102 and extend in the front and rear directions, and the rear end side is joined to a partition plate 107 described later.
[0008]
The front vertical plates 103, 104 constitute boom foot portions 103A, 104A as mounting brackets on the upper end side, and the booms 103A, 104A are attached to the boom foot portions 103A, 104A so that they can be raised and lowered. is there. Further, a horizontal plate 108 described later is provided between the front vertical plates 103 and 104.
[0009]
Reference numerals 105 and 106 denote left and right rear vertical plates which are erected on the upper surface of the rear portion of the bottom plate 102 using welding means. The rear vertical plates 105 and 106 are parallel to each other on the rear side of the bottom plate 102. , Extending in the rear direction, and the front end side is joined to a partition plate 107 described later by means such as welding.
[0010]
A partition plate 107 is provided between the front vertical plates 103 and 104 and the rear vertical plates 105 and 106 and is erected on the bottom plate 102. The partition plate 107 is positioned at the middle portion in the longitudinal direction of the bottom plate 102. The front vertical plates 103 and 104 and the rear vertical plates 105 and 106 extend leftward and rightward so as to partition (separate the front and the rear).
[0011]
The partition plate 107 is sandwiched from the front and rear by the front vertical plates 103 and 104 and the rear vertical plates 105 and 106, and is arranged between the rear end surface of the front vertical plates 103 and 104 and the front end surface of the rear vertical plates 105 and 106. Each is joined using welding means. The partition plate 107 connects the left and right front vertical plates 103 and 104 to each other on the bottom plate 102 and also connects the rear vertical plates 105 and 106 to each other.
[0012]
Reference numeral 108 denotes a horizontal plate provided between the left and right front vertical plates 103 and 104. The horizontal plate 108 is located at the front side of the boom foot portions 103A and 104A, and the left and right front vertical plates 103, 104 are joined by welding. The horizontal plate 108 extends between the left and right front vertical plates 103 and 104 to a middle position in the front and rear directions, and reinforces the front side of the boom foot portions 103A and 104A.
[0013]
Reference numerals 109 and 109 are support brackets provided between the front vertical plates 103 and 104 and provided on the front side of the horizontal plate 108. The support brackets 109 and 109 protrude forward from the boom foot portions 103A and 104A, respectively. Is rotatably supported using a connecting pin (not shown) or the like.
[0014]
The swivel frame 101 of the prior art configured as described above includes a bottom plate 102, left and right front vertical plates 103 and 104, left and right rear vertical plates 105 and 106, a partition plate 107, a horizontal plate 108, and the like. The bottom plate 102 serves as a base plate for the entire revolving frame 101 and is formed using a relatively thick steel plate or the like.
[0015]
The horizontal plate 108 provided between the left and right front vertical plates 103 and 104 is a position on the front side of the boom foot portions 103A and 104A, and is located in the middle between the front vertical plates 103 and 104 in the front and rear directions. The boom foot portions 103A and 104A are reinforced on the front side.
[0016]
[Problems to be solved by the invention]
By the way, the above-described conventional small-swing hydraulic excavator ensures the bending strength, torsional rigidity, and the like of the boom foot portions 103A and 104A by the horizontal plate 108 joined between the left and right front vertical plates 103 and 104. Like to do.
[0017]
In this case, the horizontal plate 108 used in the prior art extends between the front vertical plates 103 and 104 to a middle position in the front and rear directions, and the rear side of the boom foot portions 103A and 104A is between the partition plate 107. Has an open cross-sectional structure opened to the outside above. Then, using such an open cross-sectional structure, for example, pipe connection work to the center joint is performed on the rear side of the boom foot parts 103A and 104A.
[0018]
However, in the prior art, since the rear side of the boom foot parts 103A, 104A has an open cross-sectional structure, the strength at this part is reduced, and the boom foot parts 103A, 104A as a whole are reduced. There is a problem that it is difficult to sufficiently increase torsional rigidity and the like.
[0019]
Further, in order to ensure the strength and rigidity of the boom foot portions 103A and 104A, the left and right front vertical plates are provided with the horizontal plate 108 extending between the front vertical plates 103 and 104 to the middle position in the front and rear directions. 103 and 104 need to be welded from the inside and the outside respectively. In particular, since the inner inner welding is a welding operation in a narrow space, much labor and time are consumed, and workability is poor. There is a problem.
[0020]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to improve the torsional rigidity and the like of the boom foot part by making the rear side of the boom foot part a closed cross-sectional structure. An object of the present invention is to provide a swing frame for a construction machine that can eliminate the need for such operations as internal welding.
[0021]
In addition, another object of the present invention is to adopt the closed cross-section structure, so that the bottom plate of the revolving frame, the left and right front vertical plates, etc. can be formed with thin plate materials, reducing the overall weight and reducing the cost. Another object of the present invention is to provide a swivel frame for a construction machine that can easily balance the weight of the airframe even when the swivel radius is reduced.
[0022]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a bottom plate that is mounted on a lower traveling body via a swivel ring, and is installed on a front side of the bottom plate and extends forward and rearward on the bottom plate to extend a boom foot. The left and right front vertical plates constituting the part, and the left and right right parts constituting the tail frame that supports the engine and the counterweight by standing on the rear side of the bottom plate and extending forward and backward on the bottom plate. A rear vertical plate, a partition plate positioned between the rear vertical plate and the front vertical plate and standing on the bottom plate and extending in the left and right directions of the bottom plate; and the left and right front vertical plates Between boards It is applied to a turning frame of a construction machine provided with a horizontal plate provided on the machine.
[0023]
The characteristics of the configuration adopted by the invention of claim 1 are as follows: The horizontal plate is configured such that the front lower end side is joined to the front end side portion of the bottom plate and the rear end side extends between the left and right front vertical plates to the middle position in the front and rear directions, Between the left and right front vertical plates, The front end side is joined to the rear end side of the horizontal plate, and the rear end side is joined to the upper front side of the partition plate, A closing plate that is located between the horizontal plate and the partition plate and closes the rear side of the boom foot from above; When With the horizontal plate Said Between the left and right front vertical plates between the partition plates In Closed section structure Defines the closed cross section that forms Configuration When It is to have done.
[0024]
With this configuration, the closing plate provided between the left and right front vertical plates located between the horizontal plate and the partition plate for reinforcing the boom foot portion has the rear side of the boom foot portion from the upper side. Occluded Between the horizontal plate and the partition plate, between the left and right front vertical plates Closed section structure Defines the closed cross section that forms It is possible to increase the strength of the entire boom foot part. Also, in this case, the obstruction plate is the left and right front vertical plate. , Horizontal plate Moreover, the strength of the boom foot portion can be ensured only by welding to the partition plate or the like from the outside, and laborious internal welding as in the prior art can be omitted.
[0025]
The invention of claim 2 Features of the configuration adopted by according to, The horizontal plate has a front lower end joined to a front end portion of the bottom plate, extends between the left and right front vertical plates in the front and rear directions, and joins a rear end to the upper front side of the partition plate. The horizontal plate is closed between the left and right front vertical plates from the upper side from the front side to the rear side of the boom foot portion, so that the left and right front vertical plates are between the left and right front plates. Define a closed section that forms a closed section structure between plates With a configuration That The
[0026]
In this case, since the horizontal plate and the blocking plate described in the invention of claim 1 are configured as a horizontal plate made of a single plate material, the horizontal plate made of a single plate material is placed in front of the boom foot portion. By extending from the rear side to the rear side, it is possible to define a closed cross-sectional portion that forms a closed cross-sectional structure between the left and right front vertical plates with the partition plate, thereby increasing the strength of the boom foot portion as a whole. be able to.
[0027]
According to the invention of claim 3, At least one front vertical plate of the left and right front vertical plates is provided with a work notch hole for performing pipe connection work in the closed cross section. As a result, when piping is connected to the center joint, etc., provided on the bottom plate side of the swivel frame on the rear side of the boom foot, the piping is led out through the work notch hole between the left and right front vertical plates. The hose and other pipes can be connected smoothly without being obstructed by the obstruction plate or the horizontal plate with the top closed. be able to.
[0028]
On the other hand, according to the invention of claim 4, the upper end of the partition plate is provided with a parallel plate portion that is substantially parallel to the bottom plate and extends in the left and right directions. As a result, the bending strength of the partition plate can be increased by using the parallel plate portion.For example, even when a bending load is applied from the work device to the boom foot portion side, these loads are concentrated from the boom foot portion to the partition plate. Can be prevented.
[0029]
According to the invention of claim 5, the left and right rear vertical plates are formed by using a common member that can be used in common with each other, and the front end sides thereof are joined to the left and right side portions of the partition plate, respectively. It is said.
[0030]
As a result, the left and right rear vertical plates constituting the tail frame portion on the rear side of the bottom plate can be formed by using a common plate material on the left and right, which are different in thickness from the front vertical plate, and support the counterweight. The strength of the tail frame portion can be set to an optimum strength. Further, by joining the front end side of each rear vertical plate to the left and right side portions of the partition plate, the interval between the left and right rear vertical plates can be widened, and the degree of design freedom can be increased.
[0031]
Furthermore, according to the invention of claim 6, the left and right front vertical plates are formed using a common member that can be used in common with each other, and the rear end side thereof is joined to the partition plate. In this case, the left and right front vertical plates constituting the boom foot portion on the front side of the bottom plate can be formed using a common plate material on the left and right, which are different in thickness from the rear vertical plate. The strength of the boom foot part to which the boom is attached can be set to an optimum strength.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a case in which a turning frame of a construction machine according to an embodiment of the present invention is used as a turning frame of a small turning type hydraulic excavator will be described as an example with reference to the accompanying drawings.
[0033]
1 to 4 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a lower traveling body of the excavator, and 2 denotes an upper revolving body that is mounted on the lower traveling body 1 via a revolving wheel 3 or the like so as to be able to turn.
[0034]
The upper swing body 2 is mounted on a later-described swing frame 21, a front left side of the swing frame 21, a canopy 5 that covers the driver seat 4 from above, and a swing frame positioned on the rear side of the driver seat 4. 21 and includes an exterior cover 6 in which an engine 9 and a hydraulic pump (not shown), which will be described later, are accommodated, and a counterweight 7, which will be described later.
[0035]
Reference numeral 7 is a counterweight provided on the revolving frame 21 located on the rear side of the outer cover 6, and the counterweight 7 balances the weight of the entire upper revolving unit 2 with respect to the work device 10 described later. is there. Further, the rear end side of the counterweight 7 is formed in, for example, an arcuate shape along a virtual circle 8 having a turning radius R shown in FIG. 3 and has a turning radius R with respect to the turning center O of the upper turning body 2. It is configured to be contained within the virtual circle 8.
[0036]
The upper swing body 2 is formed in a circular arc shape so that the canopy 5, the outer cover 6 and the counterweight 7 are accommodated in the virtual circle 8 having the swing radius R, and a so-called small swing hydraulic excavator is formed. Is realized.
[0037]
Reference numeral 9 denotes an engine serving as a prime mover of the hydraulic excavator. The engine 9 is positioned on the tail frame portion 22A described later as shown by a two-dot chain line in FIG. 3 and straddles the rear vertical plates 25 and 25 in the left and right directions. And is housed in the exterior cover 6 shown in FIG. The engine 9 has a function of balancing the weight of the entire upper swing body 2 with respect to the work device 10 together with the counterweight 7.
[0038]
Reference numeral 10 denotes a working device provided at the front portion of the upper swing body 2 so as to be able to move up and down. The working device 10 is composed of, for example, an offset boom type working device, and includes a lower boom 11, an upper boom 12, a cylinder stay 13, an arm 14, and It consists of a bucket 15 and the like. The lower boom 11 of the work device 10 is pivotally mounted between boom foot portions 24A and 24A of front vertical plates 24 and 24, which will be described later, and is moved up and down by the boom cylinder 11A. is there.
[0039]
Further, the working device 10 is in a small turning posture by turning the arm 14 and the bucket 15 in a state where the lower boom 11 is greatly lifted upward, and in this small turning posture, the turning radius shown in FIG. The entire working device 10 is housed in an R virtual circle 8.
[0040]
The front vertical plates 24 and 24 to which the lower boom 11 of the working device 10 is attached are disposed at positions offset to the right by a certain dimension with respect to the turning center O of the upper turning body 2 as shown in FIG. Thereby, the driver's seat 4 and the canopy 5 are arranged with a large mounting space in the left front portion of the upper swing body 2, and are configured to improve the comfort and operability for the operator in the canopy 5.
[0041]
Reference numeral 21 denotes a revolving frame constituting the frame of the upper revolving structure 2, and the revolving frame 21 is located at the center as shown in FIGS. 24, a center frame 22 including a rear vertical plate 25, a partition plate 26, and the like, and a left side frame 35, a right side frame 38 and the like which will be described later.
[0042]
The center frame 22, the left side frame 35, and the right side frame 38 each have a skeleton structure, thereby ensuring sufficient rigidity while reducing the weight of the revolving frame 21. Further, the swivel frame 21 is entirely accommodated in an imaginary circle 8 having a swivel radius R shown in FIG. 3 by making the left side frame 35 and the right side frame 38 curved in a circular arc shape as will be described later. is there.
[0043]
Reference numeral 22 denotes a center frame constituting a central portion of the revolving frame 21. The center frame 22 includes a bottom plate 23, left and right front vertical plates 24 and 24, left and right rear vertical plates 25 and 25, and a partition plate, which will be described later. 26 or the like. The rear side of the center frame 22 is a tail frame portion 22A composed of rear vertical plates 25, 25 and the like.
[0044]
Reference numeral 23 denotes a bottom plate serving as a base plate of the center frame 22. The bottom plate 23 is formed from a steel plate or the like in a substantially symmetrical shape as shown in FIGS. 2 and 3, and extends with a predetermined length dimension in the front and rear directions. Yes. On the upper surface side of the bottom plate 23, left and right front vertical plates 24, 24 are erected on the front side of a partition plate 26, which will be described later, and left and right rear vertical plates 25 on the rear side of the partition plate 26, 25 is erected.
[0045]
The bottom plate 23 is provided with upper and lower through holes 23A located around the turning center O. An upper end or the like of a center joint (not shown) is attached to the position of the through hole 23A, and this center joint constitutes a swivel joint that forms part of the hydraulic line with the lower traveling body 1. Is.
[0046]
24 and 24 are left and right front vertical plates which are erected on the upper surface side of the front portion of the bottom plate 23 using welding means. The left and right front vertical plates 24 and 24 are made of a plate material such as a steel plate, for example. It is formed as a common member that can be used in common, and its upper end side protrudes upward in a substantially triangular shape as shown in FIG. These front vertical plates 24 are parallel to each other on the front side of the bottom plate 23 and extend in the front and rear directions, and the rear end side is joined to a partition plate 26 described later by means such as fillet welding. .
[0047]
These front vertical plates 24 constitute boom foot portions 24A and 24A as mounting brackets on the upper end side, and the lower boom 11 of the work apparatus 10 illustrated in FIG. 1 can be raised and lowered on the boom foot portions 24A and 24A. It can be attached. Further, between the left and right front vertical plates 24, 24, a lateral plate 29 and a closing plate 30, which will be described later, are provided by welding in order to increase the bending strength, torsional rigidity and the like of the boom foot portion 24A.
[0048]
2 and 4, each front vertical plate 24 has a work cutout hole 24B for leading and inserting a hydraulic pipe (not shown) such as a hose into a closed cross section 31 described later. Each is provided. The work notch hole 24B is formed as a non-circular through hole having, for example, an egg shape or a “rice ball” shape by notching the lower side of the front vertical plate 24 in the left and right directions. Has been.
[0049]
25 and 25 are left and right rear vertical plates which are erected on the upper surface side of the rear portion of the bottom plate 23 using welding means, and the left and right rear vertical plates 25 and 25 are front longitudinal as shown in FIG. They are formed as members common to each other using a plate material made of a thick steel plate or the like than the plate 24. These rear vertical plates 25 are parallel to each other on the rear side of the bottom plate 23 and extend in the front and rear directions, and the front end side is a means such as fillet welding on the left and right sides of the partition plate 26 described later. It is joined with.
[0050]
Here, the left and right rear vertical plates 25 and 25 are arranged to be far apart from each other to the left and right as compared with the front vertical plates 24 and 24, and the interval is compared with the interval between the front vertical plates 24 and 24. And it is about twice. The rear vertical plates 25, 25 constitute a tail frame portion 22A of the center frame 22 for mounting the counterweight 7 and the engine 9 on the rear side of the bottom plate 23.
[0051]
Further, as shown in FIG. 4, the front end side of the rear vertical plate 25 forms a rising portion 25A that rises upward in an arc shape, and the upper end of the rising portion 25A is connected to a parallel plate portion 26A of a partition plate 26 described later. They are joined by welding. On the other hand, the rear end side of the rear vertical plate 25 extends to a position of a weight mounting plate 28 described later.
[0052]
A partition plate 26 is positioned between the front vertical plate 24 and the rear vertical plate 25 and is erected on the bottom plate 23. The partition plate 26 is positioned at the middle portion of the bottom plate 23 in the longitudinal direction, and The plate 24 and the rear vertical plate 25 extend leftward and rightward so as to partition (separate before and after). The partition plate 26 is formed by using a steel plate or the like that is thinner than the bottom plate 23 and the rear vertical plate 25, and its lower surface side is joined to the upper surface of the bottom plate 23 together with a reinforcing plate 27 described later by welding.
[0053]
The partition plate 26 is sandwiched from the front and rear by the front vertical plates 24 and the rear vertical plates 25, and welding means are used for the rear end surface of the front vertical plate 24 and the front end surface of the rear vertical plate 25, respectively. It is joined. The partition plate 26 connects the left and right front vertical plates 24 and 24 to each other on the bottom plate 23 and also connects the rear vertical plates 25 and 25 to each other.
[0054]
Here, at the upper end side of the partition plate 26, as shown in FIG. 4, it is bent in an L shape toward the rising portion 25 </ b> A side of the rear vertical plate 25, and extends in the left and right directions substantially parallel to the bottom plate 23. A parallel plate portion 26A is provided integrally. The parallel plate portion 26A is joined so as to be folded over the upper end of the rising portion 25A, and the bending strength and the like of the entire partition plate 26 are increased.
[0055]
Further, as shown in FIG. 2, the partition plate 26 is formed to have a height dimension equal to or larger than the later-described connecting plate 33, and between the connecting plate 33 and the like in FIG. An underfloor space A, which is an underfloor portion of the driver's seat 4 indicated by a dotted line, is partially defined. And the partition plate 26 is located on the rear side of the bottom plate 23 and a space (hereinafter referred to as engine room B) for housing the engine 9 with the exterior cover 6 shown in FIG. It also has the function of dividing and partitioning.
[0056]
A reinforcing plate 27 is provided on the bottom plate 23 at the rear side of the partition plate 26. The reinforcing plate 27 is formed using a thick steel plate or the like, and extends in the left and right directions of the bottom plate 23. Thus, the left and right rear vertical plates 25, 25 are connected to each other at the front lower end side. The reinforcing plate 27 is also welded to the lower end side of the partition plate 26 and has a function of reinforcing the partition plate 26 from the rear side.
[0057]
Reference numeral 28 denotes a weight mounting plate fixed to the rear end side of the bottom plate 23 by means of welding or the like. The weight mounting plate 28 is constituted by a plate material or the like extending in the left and right directions, and the upper surface of the bottom plate 23 and the rear vertical plate 25 are provided. , 25 are joined to the rear ends. The weight mounting plate 28 reinforces the tail frame portion 22A of the center frame 22 together with the reinforcing plate 27. On the upper surface side of the weight mounting plate 28, the counterweight 7 shown in FIG. It can be attached.
[0058]
Reference numeral 29 is a horizontal plate provided between the left and right front vertical plates 24 and 24 located on the front side of the boom foot portion 24A. The horizontal plate 29 is substantially the same as the horizontal plate 108 described in the prior art. Although configured, the left and right end sides are joined to the inner side surface of each front vertical plate 24 using means such as external welding. Then, the horizontal plate 29 is bent as shown in FIG. 4 and extends between the left and right front vertical plates 24, 24 in the front and rear directions to the position of a closing plate 30 described later.
[0059]
Here, the horizontal plate 29 extending in the front and rear directions between the left and right front vertical plates 24 and 24 has a front lower end side 29A joined to a front end side portion of the bottom plate 23 by external welding as shown in FIG. The rear end side 29B extends between the front vertical plates 24 and 24 to a midway position in the front and rear directions. The rear end side 29B of the horizontal plate 29 is joined to the front end side of the closing plate 30 by welding.
[0060]
Reference numeral 30 denotes a closing plate provided between the left and right front vertical plates 24 and 24 together with the horizontal plate 29. The closing plate 30 is formed using a steel plate or the like that is thinner than the horizontal plate 29, and the front end side thereof is a horizontal plate. The plate 29 is joined to the rear end side 29B. In addition, the closing plate 30 is joined to the inner side surface of each front vertical plate 24 by means such as external welding at a position on the rear side of the horizontal plate 29.
[0061]
The closing plate 30 extends with the horizontal plate 29 between the left and right front vertical plates 24, 24 in the front and rear directions, and the rear end side 30A is joined to the upper front side of the partition plate 26 by external welding. . As a result, the closing plate 30 closes the left and right front vertical plates 24 and 24 together with the horizontal plate 29 from the upper side from the front side to the rear side of the boom foot portion 24A. A closed cross-sectional portion 31 having a substantially trapezoidal closed cross-sectional structure is defined.
[0062]
Reference numerals 32 and 32 are support brackets provided between the left and right front vertical plates 24 and 24 and provided on the front side of the closing plate 30. Each support bracket 32 protrudes forward of the boom foot portion 24A. The base end side of the boom cylinder 11 </ b> A shown in FIG. 3 is supported rotatably using a connecting pin (not shown) or the like.
[0063]
Reference numerals 33 and 34 denote left and right connecting plates that connect the front end side of the center frame 22 to side frames 35 and 38, which will be described later. The connecting plates 33 and 34 are bottom plates on the base end side as shown in FIGS. 23 and the front end side of each front vertical plate 24, and the front end side is parallel to each other and protrudes forward.
[0064]
Here, the left connecting plate 33 is formed by bending a substantially rectangular steel plate into an L shape, and the upper end side of the connecting plate 33 protrudes upward like the partition plate 26. The connecting plate 33 serves as a bracket portion for supporting the floor plate side of the driver's seat 4 shown in FIG. 1 from below, and the under floor space A on the bottom plate 23 is defined between the left side frame 35 and the partition plate 26. It is to be formed.
[0065]
The right connecting plate 34 is formed of a steel plate or the like as a substantially triangular plate as shown in FIGS. 2 and 4, and the front end side of the right side frame 38 described later is connected to the front end side of the center frame 22. The joint strength between the center frame 22 and the right side frame 38 is increased.
[0066]
Reference numeral 35 denotes a left side frame that constitutes a part of the turning frame 21. The left side frame 35 includes a bent frame body 36 that is curved in an arc shape so as to be contained within the virtual circle 8 having the turning radius R shown in FIG. The bending frame body 36 is formed, for example, by bending a rectangular tube-shaped hollow frame material or pipe material having a rectangular cross section.
[0067]
Here, the bending frame body 36 becomes a front frame portion 36A whose front end side is bent in the right direction, and the front frame portion 36A extends to the position of the connecting plate 33 so as to be substantially parallel to a protruding beam 37 described later. Yes. Further, the rear end side of the bending frame 36 extends rearward to a position beyond the overhanging beam 37, and the end thereof is a free end 36B.
[0068]
The bending frame body 36 is welded (joined) to the front end side of the center frame 22 through the connecting plate 33 at the front end side of the front frame portion 36 </ b> A, and the rear end side of the bending frame body 36 is connected through the protruding beam 37. The center frame 22 is joined to an intermediate portion in the length direction. As a result, the bending frame 36 constitutes the left side frame 35 that is firmly connected to the center frame 22.
[0069]
Reference numeral 37 denotes an extended beam as a reinforcing member provided between the center frame 22 and the left side frame 35. The extended beam 37 is joined to the inner surface of the rear portion of the bending frame 36 at the base end side. It extends substantially parallel to the front frame portion 36A toward the rear vertical plate 25 side.
[0070]
And the front end side of the overhanging beam 37 is joined to the upper surface of the bottom plate 23 and the front left side surface of the rear vertical plate 25 at the middle portion in the longitudinal direction of the center frame 22, whereby the overhanging beam 37 is connected to the center frame. 22, the bonding strength of the left side frame 35 (bending frame body 36) to 22 is increased. The overhanging beam 37 supports the floor plate and the like of the driver's seat 4 from the lower side together with the front frame portion 36A of the bending frame body 36 and the like.
[0071]
Reference numeral 38 denotes a right side frame that constitutes a part of the turning frame 21. The right side frame 38 is a right bending frame 39 that is curved in an arc shape so as to be contained in a virtual circle 8 having a turning radius R shown in FIG. The bending frame body 39 is configured in substantially the same manner as the left bending frame body 36.
[0072]
Here, the bent frame body 39 becomes a front frame portion 39A whose front end side is bent leftward, and the front frame portion 39A reaches the position of the connecting plate 33 so as to be substantially parallel to protruding beams 40 and 41 described later. It extends. Further, the rear end side of the bending frame 39 extends rearward to a position beyond the overhanging beam 41, and the end thereof is a free end 39B.
[0073]
The bent frame body 39 is welded (joined) to the front end side of the center frame 22 through the connecting plate 33 at the front end side of the front frame portion 39A, and the middle part in the length direction is centered through the overhanging beams 40 and 41. It is joined to the frame 22. Thus, the bending frame 39 constitutes the right side frame 38 that is firmly connected to the center frame 22.
[0074]
Reference numerals 40 and 41 denote extended beams as other reinforcing members disposed with a space between the center frame 22 and the right side frame 38, and the proximal ends of the extended beams 40 and 41 are bent. It is joined to the inner surface of the frame 39 and extends substantially parallel to the front frame portion 39A toward the front vertical plate 24 side of the center frame 22.
[0075]
And the front end side of the overhanging beams 40 and 41 is joined to the upper surface of the bottom plate 23 and the right side surface of the front vertical plate 24 at the intermediate portion in the longitudinal direction of the center frame 22, whereby the overhanging beams 40 and 41 are The joining strength of the right side frame 38 (bending frame 39) to the center frame 22 is increased.
[0076]
The small swivel excavator according to the present embodiment has the above-described configuration. Next, a method for assembling the swivel frame 21 will be described.
[0077]
First, in the assembly process of the center frame 22, the front vertical plates 24, 24 on the upper surface side of the bottom plate 23 formed in a substantially rectangular shape from a thick steel plate or the like as shown in FIGS. The plates 25, 25, the partition plate 26, and the like are welded, and boom foot portions 24A, 24A for pin-coupling the lower boom 11 of the work device 10 are provided on the upper side of the front vertical plates 24, 24 by welding means or the like.
[0078]
Then, the horizontal plate 29 and the closing plate 30 are welded between the boom foot portions 24A and 24A so as to increase the bending strength, torsional rigidity and the like of the boom foot portion 24A. In this case, the closing plate 30 extends between the left and right front vertical plates 24, 24 together with the horizontal plate 29 in the front and rear directions to the position of the partition plate 26, and the rear end side 30 </ b> A on the upper front side of the partition plate 26. Join by external welding.
[0079]
Then, the left and right front vertical plates 24, 24 are closed from the upper side to the rear side of the boom foot portion 24A by the horizontal plate 29 and the closing plate 30 as shown in FIG. A substantially trapezoidal closed section 31 is formed on the bottom plate 23. In addition, a cylinder support bracket 32 is provided on the front side of the front vertical plates 24, 24 on the front side of the horizontal plate 29. The support bracket 32 has a base end of the boom cylinder 11A shown in FIG. The side can be pivotally connected to the pin.
[0080]
Further, a weight mounting plate 28 is provided on the rear side of the rear vertical plates 25, 25 at the rear end side of the bottom plate 23, and a plurality of counterweights 7 shown in FIG. Removably attach using bolts.
[0081]
On the other hand, the left side frame assembling step for assembling the left side frame 35 can be performed using an assembly line different from the center frame 22. In this case, as the left side frame 35, a bent frame body 36 formed by bending a hollow frame material or the like as shown in FIGS. The bending frame 36 is provided by welding a protruding beam 37 on the rear side.
[0082]
On the other hand, the right side frame assembly process for assembling the right side frame 38 can also be performed using an assembly line different from the center frame 22 and the left side frame 35. Also in this case, as the right side frame 38, a bent frame 39 formed by bending a hollow frame material or the like as shown in FIGS. Then, overhanging beams 40 and 41 are provided by welding in the middle of the bending frame 39 in the length direction.
[0083]
Next, in the frame combination process, for example, the left side frame 35 and the right side frame 38 assembled as described above are conveyed to the assembly line of the center frame 22 and the like, and these side frames 35 and 38 are transferred to FIG. As shown in FIG. 3, the left and right sides of the center frame 22 are combined.
[0084]
The left side frame 35 is welded to the bottom frame 23 and the rear vertical plate 25 of the center frame 22 by welding the front frame portion 36A of the bending frame body 36 and the distal end side of the protruding beam 37 to the center frame 22. Are joined together.
[0085]
The right side frame 38 is also welded to the bottom frame 23 and the front vertical plate 24 of the center frame 22 by welding the front frame portion 39A of the bending frame 39 and the distal ends of the overhanging beams 40 and 41, respectively. 22 are integrally joined.
[0086]
Thus, the swivel frame 21 according to the present embodiment is assembled in a framework structure by the center frame 22, the left side frame 35, and the right side frame 38, and the side frames 35, 38, etc. are rectangular tube-shaped hollow frame materials, etc. Therefore, it is not necessary to secure the overall strength by using one bottom plate 102 as in the revolving frame 101 described in the prior art.
[0087]
And while being able to achieve weight reduction of the whole turning frame 21, the intensity | strength of the whole turning frame 21 can be raised efficiently by using a frame structure. Further, the material cost of the entire revolving frame 21 can be reduced, and the cost can be reduced.
[0088]
Further, by using the revolving frame 21 assembled in this manner, a small revolving hydraulic excavator can be manufactured as shown in FIGS. The hydraulic excavator can accommodate the counterweight 7 mounted on the rear end side of the swing frame 21 via the weight mounting plate 28 in the virtual circle 8 having the swing radius R as shown in FIG.
[0089]
For the center frame 22 of the revolving frame 21, left and right front vertical plates 24 and 24, left and right rear vertical plates 25 and 25, a partition plate 26 and the like are erected on the bottom plate 23 by welding, respectively. Between the left and right front vertical plates 24, 24, located on the rear side of the horizontal plate 29, extends the closing plate 30 forward and rearward to the position of the partition plate 26, and the rear end side 30 </ b> A is the upper part of the partition plate 26. It is joined to the front side by external welding.
[0090]
As a result, the left and right front vertical plates 24, 24 can be closed from the upper side to the rear side of the boom foot portion 24A using the horizontal plate 29 and the closing plate 30, as shown in FIG. A closed cross-sectional portion 31 having a substantially trapezoidal closed cross-sectional structure can be formed on the bottom plate 23.
[0091]
As a result, the boom foot portion 24A for pin-coupling the lower boom 11 of the work device 10 can be reliably reinforced by the closing plate 30 forming the closed cross-section portion 31, and the bending strength, torsional rigidity, etc. of the boom foot portion 24A can be effectively increased. Can be increased. Further, by increasing the rigidity of the boom foot portion 24A and the like, it becomes possible to form the bottom plate 23, the front vertical plate 24, etc. with thin plate materials, so that the weight of the center frame 22 as a whole is reduced and the manufacturing cost is reduced. can do.
[0092]
Further, in this case, the strength of the boom foot portion 24A can be ensured only by welding the horizontal plate 29 and the closing plate 30 to the left and right front vertical plates 24, 24 and the partition plate 26 from the outside. It is possible to improve workability during assembly by eliminating the need for laborious internal welding as in the prior art.
[0093]
Further, in the assembly process of the hydraulic excavator, a center joint serving as a swivel joint is provided between the lower traveling body 1 and the swivel frame 21 of the upper swivel body 2 through a through hole 23A of the bottom plate 23, and then the center joint. The work which connects piping, such as a hose, to the upper part side of is needed.
[0094]
However, at this time, piping such as a hose is easily led out and inserted into the closed section 31 between the left and right front vertical plates 24 and 24 through the work notch holes 24B formed in each front vertical plate 24. Can do. Thereby, piping connection work, such as a hose, can be smoothly performed in the closed cross-section 31 without being obstructed by the closing plate 30 that closes the upper side of the closed cross-section 31 on the rear side of the boom foot 24A.
[0095]
On the other hand, with respect to the tail frame portion 22A of the center frame 22, the left and right rear vertical plates 25, 25 made of a common member are erected on the rear side of the bottom plate 23, and the front end side of each rear vertical plate 25 is the partition plate 26. Since the left and right rear vertical plates 25 and 25 and the partition plate 26 are used to join the left and right side portions of the bottom plate 23, a tail having a substantially U-shaped frame structure is formed on the rear side of the bottom plate 23. The frame portion 22A can be configured.
[0096]
As a result, the left and right rear vertical plates 25, 25 can be formed using a plate material having a plate thickness different from that of the front vertical plate 24, and the strength of the tail weight portion 22A that supports the counterweight 7 and the engine 9 is optimized. Can be set to strength. Further, the space between the left and right rear vertical plates 25, 25 can be widened, and the degree of freedom in design can be increased.
[0097]
The counterweight 7 and the engine 9 can be stably mounted on the tail frame portion 22A side, and even when the turning radius R (virtual circle 8) of the turning frame 21 is reduced, the airframe (the entire upper turning body 2) Weight balance can be easily achieved.
[0098]
Further, since the parallel plate portion 26A is provided on the upper end side of the partition plate 26 so as to be substantially parallel to the bottom plate 23 and extending in the left and right directions, the bending strength of the partition plate 26 can be increased by the parallel plate portion 26A. For example, even if a bending load or the like is applied from the work device 10 to the boom foot portion 24A side, it is possible to prevent these loads from being concentrated on the partition plate 26 from the boom foot portion 24A.
[0099]
Further, the left and right front vertical plates 24 and 24 constituting the boom foot portion 24A on the front side of the bottom plate 23 can also be formed by using a common plate material on the left and right different in thickness from the rear vertical plate 25. Therefore, the strength of the boom foot portion 24A to which the lower boom 11 of the work device 10 is attached can be set to an optimum strength.
[0100]
Therefore, according to the present embodiment, the closed cross section 31 is provided between the front vertical plates 24 by extending the closing plate 30 provided on the rear end side 29B of the horizontal plate 29 to the position of the partition plate 26. Therefore, the torsional rigidity and the like of the boom foot portion 24A can be increased. And it becomes possible to form the bottom plate 23, the front vertical plate 24, etc. of the revolving frame 21 with a thin plate material, and it is possible to reduce the overall weight and reduce the cost.
[0101]
Even when the turning radius R of the turning frame 21 is reduced, the weight balance of the airframe can be easily achieved by forming the bottom plate 23, the front vertical plate 24, etc. of the turning frame 21 with thin plate materials.
[0102]
Further, the horizontal plate 29 and the closing plate 30 can be secured to the left and right front vertical plates 24 and the partition plate 26 from the outside, so that the strength of the boom foot portion 24A and the like can be secured. It is possible to improve workability during assembly by eliminating welding.
[0103]
Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Shall. However, a feature of the present embodiment is that the horizontal plate 51 provided between the left and right front vertical plates 24 and 24 is extended to the position of the partition plate 26 in the front and rear directions.
[0104]
Here, the horizontal plate 51 is formed by forming the horizontal plate 29 and the closing plate 30 described in the first embodiment by using a single plate material, and the left and right both ends thereof are the front vertical plates 24. It is joined to the inner surface of the outer surface using means such as external welding. The horizontal plate 51 is bent as shown in FIG. 5 and extends between the left and right front vertical plates 24, 24 in the front and rear directions to the position of the partition plate 26.
[0105]
Further, the horizontal plate 51 extending in the front and rear directions between the left and right front vertical plates 24 and 24 has a front lower end side 51A joined to a front end side portion of the bottom plate 23 by external welding, and the rear end side 51B is a partition. The plate 26 is joined to the upper front side by external welding. The horizontal plate 51 closes the left and right front vertical plates 24, 24 from above from the front side to the rear side of the boom foot portion 24A.
[0106]
Accordingly, the horizontal plate 51 defines a closed cross-section portion 52 that forms a substantially trapezoidal closed cross-section structure on the bottom plate 23 between the horizontal plate 51 and the partition plate 26. Further, the horizontal plate 51 protrudes upward with the front and rear intermediate portions as top portions 51C, and the top portions 51C are formed to be bent in a substantially square shape to reinforce the boom foot portion 24A of the front vertical plate 24. ing.
[0107]
Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. Particularly in the present embodiment, the left and right front vertical plates 24, 24 can be closed from the upper side from the front side to the rear side of the boom foot portion 24A using the horizontal plate 51 made of a single plate material, and the boom foot portion 24A can be closed. Torsional rigidity and the like can be increased.
[0108]
In each of the above embodiments, the swivel frame 21 in which the front vertical plate 24 and the rear vertical plate 25 are completely divided by the partition plate 26 has been described as an example. However, the present invention is not limited to this, and at least one front vertical plate of the left and right front vertical plates is integrated with the rear vertical plate, for example, as in a turning frame described in JP-A-2001-115488. You may form using this board | plate material.
[0109]
That is, the feature of the present invention is that the horizontal plate provided between the left and right front vertical plates, the closing plate is extended to the position of the partition plate, and the rear part side of the boom foot part has a closed cross-sectional structure. Various changes can be made.
[0110]
Further, in each of the above embodiments, the case where the turning frame 21 is constituted by the center frame 22 and the left and right side frames 35 and 38 has been described as an example. However, the present invention is not limited to this. For example, as described in JP-A-11-303139, JP-A-2001-115488, etc., the bottom plate of the turning frame is arranged along an arc having a predetermined turning radius. Alternatively, the left and right side frames may be abolished.
[0111]
Further, in each of the above-described embodiments, the case where the upper swing body 2 configured to cover the driver's seat 4 from the upper side with the canopy 5 is described as an example. However, the present invention is not limited to this. For example, a cab configured to cover the driver's seat in a box shape from the outside may be provided on the revolving frame.
[0112]
Further, in each of the above-described embodiments, the small-slewing hydraulic excavator has been described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to a turning frame of a construction machine including an upper turning body such as a wheel-type hydraulic excavator or a hydraulic crane.
[0113]
【The invention's effect】
As detailed above, according to the invention of claim 1, The front lower end side of the horizontal plate is joined to the front end side portion of the bottom plate, and the rear end side of the horizontal plate extends between the left and right front vertical plates to the middle position in the front and rear directions. Between the front vertical plates, the front end side is joined to the rear end side of the horizontal plate, the rear end side is joined to the upper front side of the partition plate, Located between the horizontal plate and the partition plate Rear side of boom foot Close the obstruction plate from above The closing plate and the horizontal plate are provided between the left and right front vertical plates between the partition plates. Closed section structure Defines the closed cross section that forms Since it is set as the structure which carries out, the torsional rigidity etc. of the whole boom foot part can be improved. The bottom plate of the revolving frame, the left and right front vertical plates, etc. can be formed from thin plate materials, reducing the overall weight and reducing the cost, and the weight of the aircraft even when the turning radius is reduced. Balance can be easily taken. In this case, the boom foot can be secured simply by welding the closing plate to the left and right front vertical plates and the partition plate from the outside, eliminating the need for troublesome internal welding as in the prior art. Workability during assembly can be improved.
[0114]
According to the invention of claim 2, The horizontal plate with the front lower end joined to the front end side part of the bottom plate extends in the front and rear directions between the left and right front vertical plates, and the rear end is joined to the upper front side of the partition plate. The horizontal plate is closed between the left and right front vertical plates from the upper side from the front side to the rear side of the boom foot portion, so that the left and right plates Front vertical board Between Closed section structure Define the closed cross section that forms So that The left and right front vertical plates can be closed from the upper side using a horizontal plate made of a single plate material, thereby forming a closed cross section that forms a closed cross-section structure between the left and right front vertical plates. be able to.
[0115]
According to the invention of claim 3, At least one front vertical plate of the left and right front vertical plates is provided with a work notch hole for performing pipe connection work within the closed cross section. Because For example, when pipe connection work is performed on the center joint, etc., provided on the bottom plate side of the swivel frame on the rear side of the boom foot, the piping should be led out and inserted between the left and right front vertical plates. The hose and other pipes can be connected smoothly without being obstructed by the obstruction plate or the horizontal plate that closes the top. be able to.
[0116]
On the other hand, since the invention according to claim 4 is provided with a parallel plate portion extending in the left and right directions substantially parallel to the bottom plate on the upper end side of the partition plate, the bending strength of the partition plate by the parallel plate portion. For example, even when a bending load or the like is applied from the work device to the boom foot part, it is possible to prevent these loads from being transmitted from the boom foot part to the partition plate.
[0117]
Further, the invention described in claim 5 uses the left and right rear vertical plates constituting the tail frame portion on the rear side of the bottom plate, and uses a common plate material on the left and right different in thickness from the front vertical plate. It can be formed, and the strength of the tail frame portion that supports the counterweight can be set to an optimum strength. Further, by joining the front end side of each rear vertical plate to the left and right side portions of the partition plate, the interval between the left and right rear vertical plates can be widened, and the degree of design freedom can be increased.
[0118]
Furthermore, the invention described in claim 6 uses the left and right front vertical plates constituting the boom foot portion on the front side of the bottom plate, and the left and right common plate materials having different thicknesses from the rear vertical plate. The strength of the boom foot part to which the boom of the working device is attached can be set to an optimum strength.
[Brief description of the drawings]
FIG. 1 is an external view showing a small swing hydraulic excavator to which a swing frame according to a first embodiment of the present invention is applied.
FIG. 2 is an enlarged perspective view showing a turning frame in FIG. 1;
3 is a plan view of the revolving frame shown in FIG. 2. FIG.
4 is an enlarged cross-sectional view of the turning frame as seen from the direction of arrows IV-IV in FIG. 3;
FIG. 5 is a cross-sectional view at a position substantially similar to FIG. 4 showing a turning frame according to a second embodiment of the present invention.
FIG. 6 is a plan view showing a revolving frame according to the prior art.
7 is a cross-sectional view of the turning frame as seen from the direction of arrows VII-VII in FIG.
[Explanation of symbols]
1 Lower traveling body
2 Upper swing body
3 Turning wheel
4 Driver's seat
5 Canopy
6 Exterior cover
7 Counterweight
8 virtual circle
9 Engine
10 Working device
11 Lower boom
11A boom cylinder
21 Rotating frame
22 Center frame
22A Tail frame
23 Bottom plate
24 Front vertical board
24A boom foot
25 Rear vertical plate
26 Partition plate
28 Weight mounting plate
29,51 horizontal plate
30 Blocking plate
31, 52 Closed section (closed section structure)
35 Left side frame
36,39 Bending frame
37, 41, 41 Overhang beam
38 Right side frame
O Turning center
R turning radius

Claims (6)

  1. A bottom plate mounted on the lower traveling body via a swivel wheel, left and right front vertical plates standing on the front side of the bottom plate and extending forward and rearward on the bottom plate to form a boom foot portion;
    Left and right rear vertical plates, which are erected on the rear side of the bottom plate and extend forward and rearward on the bottom plate to support the engine and counterweight, the rear vertical plates, and the respective rear vertical plates Construction comprising a partition plate standing between the front vertical plate and standing on the bottom plate and extending in the left and right directions of the bottom plate, and a horizontal plate provided between the left and right front vertical plates In the swivel frame of the machine,
    The horizontal plate is configured such that the front lower end side is joined to the front end side portion of the bottom plate and the rear end side extends between the left and right front vertical plates to the middle position in the front and rear directions,
    Between the left and right front vertical plates, the front end side is joined to the rear end side of the horizontal plate and the rear end side is joined to the upper front side of the partition plate, and located between the horizontal plate and the partition plate. Providing a closing plate for closing the rear side of the boom foot part from above ,
    The said closure plate and said transverse plate, a construction machine, characterized in that the said left and configured to define a closed-section portion forming a closed cross section before the vertical plates of the right between the partition plate Swivel frame.
  2. A bottom plate mounted on the lower traveling body via a swivel wheel, left and right front vertical plates standing on the front side of the bottom plate and extending forward and rearward on the bottom plate to form a boom foot portion;
    Left and right rear vertical plates, which are erected on the rear side of the bottom plate and extend forward and rearward on the bottom plate to support the engine and counterweight, the rear vertical plates, and the respective rear vertical plates Construction comprising a partition plate standing between the front vertical plate and standing on the bottom plate and extending in the left and right directions of the bottom plate, and a horizontal plate provided between the left and right front vertical plates In the swivel frame of the machine,
    The horizontal plate has a front lower end joined to a front end portion of the bottom plate, extends between the left and right front vertical plates in the front and rear directions, and joins a rear end to the upper front side of the partition plate. With configuration,
    The horizontal plate is closed between the left and right front vertical plates between the left and right front vertical plates by closing the space between the left and right front vertical plates from the upper side from the front side to the rear side of the boom foot portion. A swivel frame for a construction machine, characterized in that a closed cross section having a closed cross section structure is defined .
  3. The left, at least one of the front vertical plate of the right front vertical plate construction according to claim 1 or 2 comprising providing a working notch hole for performing a pipe connecting work in the closed section portion Mechanical swivel frame.
  4.   The revolving frame for a construction machine according to claim 1, 2 or 3, wherein a parallel plate portion is provided on the upper end side of the partition plate substantially parallel to the bottom plate and extending in the left and right directions.
  5.   The left and right rear vertical plates are formed using a common member that can be used in common with each other, and the front end sides thereof are joined to the left and right side portions of the partition plate, respectively. The turning frame of the construction machine according to 3 or 4.
  6.   The left and right front vertical plates are formed using a common member that can be used in common with each other, and rear end sides thereof are joined to the partition plates, respectively. Swivel frame of the described construction machine.
JP2002010238A 2002-01-18 2002-01-18 Construction machine swivel frame Active JP3947009B2 (en)

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
JP2016172989A (en) * 2015-03-17 2016-09-29 コベルコ建機株式会社 Boom foot part of work machine
JP2016173010A (en) * 2015-03-18 2016-09-29 コベルコ建機株式会社 Boom foot part for work machine

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JP2007032477A (en) * 2005-07-28 2007-02-08 Shin Caterpillar Mitsubishi Ltd Vehicle
KR100910169B1 (en) * 2007-07-04 2009-07-31 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 Upper frame of excavator
KR100979429B1 (en) * 2008-02-27 2010-09-02 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 upper frame of construction equipment
JP5470782B2 (en) * 2008-09-09 2014-04-16 コベルコクレーン株式会社 Crane
JP5189011B2 (en) * 2009-02-26 2013-04-24 日立建機株式会社 Construction machine swivel frame
JP5077330B2 (en) * 2009-11-09 2012-11-21 コベルコ建機株式会社 Construction machine upper frame
JP5427690B2 (en) * 2010-05-14 2014-02-26 株式会社神戸製鋼所 Excavator swivel frame
CN102465542B (en) * 2010-11-05 2014-06-18 日立建机(中国)有限公司 Main platform of excavator
JP5458069B2 (en) * 2011-09-02 2014-04-02 日立建機株式会社 Construction machinery

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Publication number Priority date Publication date Assignee Title
JP2016172989A (en) * 2015-03-17 2016-09-29 コベルコ建機株式会社 Boom foot part of work machine
JP2016173010A (en) * 2015-03-18 2016-09-29 コベルコ建機株式会社 Boom foot part for work machine

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