JPH09256413A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a riding comfort or operability by restraining the vibration of a counterweight during a travel or a work. SOLUTION: A counterweight 7 is structured so as to be held on a center weight support part 17, and right and left support frames 22 laid at the right and left sides of the center weight support part 17. As a result, the support span of the counterweight 7 in a right and left direction increases, compared, for example, with the case of holding the conterweight 7 only on the center weight support part 17, thereby restraining the lateral swing of the counterweight 7 during the travel of a hydraulic shovel or the excavation work thereof. Also, a vibration propagating from the counterweight 7 to an operator cab via a swing frame 4 can be effectively reduced, thereby substantially improving an operator's riding comfort or operability for an operation lever.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic excavator provided with a counterweight,
In particular, the present invention relates to a construction machine capable of reducing the vibration of the counterweight during traveling or working.

[0002]

2. Description of the Related Art A construction machine such as a hydraulic excavator applied to excavation work at a construction site is disclosed in, for example, Japanese Patent Laid-Open No. 6-10374.
As described in Japanese Patent Publication No. JP-A-2003-138, etc., it comprises a lower traveling body and an upper revolving body rotatably mounted on the lower traveling body and having a main body frame, a driver's cab, a machine room, and the like. On the side, a working device is provided so that it can be lifted and lowered. Then, the pressure oil discharged from the hydraulic pump arranged in the machine room of the upper swing body is supplied to and discharged from the traveling hydraulic motor of the lower traveling body and the hydraulic cylinder of the working device, so that the lower traveling body is moved. It is designed to drive and excavate earth and sand. Here, when the working device is raised and lowered during excavation work of the hydraulic excavator, the counterweight arranged on the rear side of the main body frame is balanced with respect to the working device.

By the way, the main body frame usually has a pair of center frames extending in the front and rear directions at the center positions in the left and right directions, and a pair of center frames extending in the front and rear directions at the left and right sides of the center frames. The counterweight is configured to form a skeletal structure with side frames and the like, and the counterweight is usually provided with a mounting bolt or the like on a pair of weight support portions integrally formed on the rear side of the center frame with the same width dimension as the center frame. It is designed to be detachably fixed via the.

[0004]

However, in the hydraulic excavator according to the prior art, the width dimension between the pair of center frames is usually smaller than the width dimension of the main body frame, and they are integrally formed on the rear side of each center frame. The width dimension between the respective center side weight supporting portions is smaller than the width dimension of the main body frame.

On the other hand, since the counterweight is formed with a width dimension substantially equal to that of the main body frame, the support interval (span) of the counterweight by the weight support portion is smaller than the width dimension of the counterweight. Become. For this reason, the counterweight is apt to vibrate on both left and right sides of the weight support portion as a center, and is apt to vibrate on the upper end side with respect to the lower end side supported by the weight support portion.

For this reason, when the hydraulic excavator is running or during excavation work, the counterweight rolls in the left and right directions centering on the weight support portion (rolling) and pitches in the front and rear directions (pitching). ) Is likely to occur.
Then, the rolling or pitching of the counterweight is propagated to the driver's cab via the main body frame to which the counterweight is attached, and the ride comfort of the operator in the operator's cab and the operability of the operating lever are significantly deteriorated. There is a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a construction machine capable of suppressing the vibration of the counterweight during traveling or working and improving the riding comfort and operability. Has an aim.

[0008]

In order to solve the above-mentioned problems, the present invention provides a main body frame having a skeletal structure, a working device provided on the front side of the main body frame, and a balance with the working device. Therefore, it is applied to a construction machine including a counterweight provided on the rear side of the main body frame.

The features of the configuration adopted by the invention of claim 1 are that the first weight support portion which supports the counterweight at the center position in the left and right directions, and the first weight support portion with respect to the first weight support portion. The second weight support portion is provided at least on the left and right sides or on both sides in the up and down directions to support the counterweight.

According to the above construction, the counter is composed of the first weight supporting portion and the second weight supporting portion located at least on the left, right or up and down sides of the first weight supporting portion. By supporting the weights, the support interval (span) in the left, right, up, and down directions of the counterweight is increased, and the vibration of the counterweight centering on the mounting position with each weight support part can be suppressed. it can.

According to a second aspect of the present invention, a main body frame having a skeletal structure, a work device provided on the front side of the main body frame, and a work frame provided on the rear side of the main body frame for balancing the work device. In a construction machine including a counter weight, the rear end of the body frame is
A pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions, and left and right sides that are located on both left and right sides of the center-side weight support portion and support the counterweight. The weight support part is provided.

According to the above construction, by providing the left and right weight support parts on both the left and right sides of the center side weight support part, the support interval in the left and right directions of the counter weight is increased, and each weight support part is increased. Rolling of the counterweight centering on the mounting position of and can be suppressed.

According to a third aspect of the present invention, a main body frame having a skeletal structure, a work device provided on the front side of the main body frame, and a work frame provided on the rear side of the main body frame for balancing the work device. In a construction machine including a counter weight, the rear end of the body frame is
A pair of center side weight support portions that support the counterweight at the center positions in the left and right directions, and a pair of upper weight support portions that are located above the center side weight support portion and support the counterweight. It is provided.

According to the above construction, by providing the upper weight supporting portion located above the central weight supporting portion, the supporting interval in the upper and lower directions of the counter weight is increased, and the upper and lower weight supporting portions are separated from each other. It is possible to suppress vertical pitching of the counterweight around the mounting position.

According to a fourth aspect of the present invention, a main body frame having a skeletal structure, a work device provided on the front side of the main body frame, and a work frame provided on the rear side of the main body frame for balancing the work device. In a construction machine including a counter weight, the rear end of the body frame is
A pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions, and left and right sides that are located on both left and right sides of the center-side weight support portion and support the counterweight. There is provided a weight support portion and a pair of upper weight support portions positioned above the central weight support portion and supporting the counterweight.

According to the above construction, the left and right weight support parts increase the support interval of the counterweight in the left and right directions, and the upper weight support part increases the support interval of the counterweight in the up and down directions. . As a result, it is possible to suppress the horizontal swing and vertical swing of the counterweight centering on the mounting position with respect to each weight support portion.

According to a fifth aspect of the present invention, a main body frame having a skeletal structure, a working device provided on the front side of the main body frame, and a work frame provided on the rear side of the main body frame for balancing the working device. In a construction machine including a counter weight, the rear end of the body frame is
A pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions, and left and right sides that are located on both left and right sides of the center-side weight support portion and support the counterweight. A weight supporting portion, a pair of upper weight supporting portions positioned above the central weight supporting portion and supporting the counterweight, and positioned on both left and right upper sides of the central weight supporting portion The upper left side and the upper right side support frame for supporting the counterweight are provided.

According to the above construction, in addition to the central weight support portion, the left and right weight support portions, and the upper weight support portion, the upper left side and the upper left side located on the left and right sides of the central weight support portion, By providing the upper right weight support portion, in addition to increasing the support interval in the left, right, up, and down directions of the counterweight, the support rigidity for the counterweight is improved and the vibration of the counterweight is reduced. You can

According to a sixth aspect of the present invention, the counterweight is provided with a concave portion for accommodating the weight supporting portions, and the weight supporting portions are shielded from the outside by the counterweight.

According to the above construction, by supporting the counterweight in a state where each weight support portion is accommodated in the recessed portion, it is possible to prevent each weight support portion from being exposed to the outside of the counterweight, and the construction machine The overall appearance beauty can be maintained in a suitable state.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, FIGS. 1 to 5 show a first embodiment of the present invention.
Is shown.

In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine according to the present embodiment. The hydraulic excavator 1 includes an undercarriage 2 and an upper revolving superstructure 3 rotatably mounted on the undercarriage 2. And have.

The upper revolving structure 3 is composed of a revolving frame 4 as a main body frame having a skeletal structure, a driver's cab 5 mounted on the revolving frame 4, a machine room 6 and a counterweight 7. . And the swivel frame 4
A work device 8 is provided on the front side of the device so that the work device 8 can be raised and lowered, and the upper swing body 3 is balanced by the counterweight 7 with respect to the work device 8. The counterweight 7 is made by filling a weight adjusting material (not shown) made of concrete, iron pieces, or the like in an outer shell made of a steel plate having a hollow structure, and the weight is adjusted according to the weight of the working device 8. It is supposed to be done.

As shown in FIG. 2, the swivel frame 4 is provided with a center frame 9 extending in the front and rear directions at a center position in the left and right directions, and on both sides of the center frame 9 in the left and right directions. A pair of side frames 1 extending in the front and rear directions
0, 10, center frame 9 and each side frame 10
A plurality of overhanging beams 11, 11, ...
And a long plate-shaped rear end beam 12 whose both ends are joined to the rear end of each side frame 10 to form a skeletal structure.

Further, the center frame 9 is erected on a plate 13 which constitutes a connecting portion with a turning device (not shown), and is a center beam composed of a pair of left and right plate members extending in the front and rear directions. 14 and 14 and a long plate-shaped upper flange plate 1 joined to the upper surface of each center beam 14 by welding or the like.
5 and 15 and lower flange plates 16 and 16 joined to the lower surface of the center beam 14 on the rear side by welding or the like.

Reference numerals 17 and 17 denote central weight supporting portions as first weight supporting portions, which are provided at the rear ends of the revolving frame 4 and are located at the centers in the left and right directions, and the respective central weights. The support portion 17 is integrally formed on the rear end side of the center frame 9. Here, the center side weight support portion 17 serves as an extension of the center beam 14 and serves as the rear end beam 12
A vertical plate 18 protruding rearward of the vertical plate 18, an upper plate 19 joined to the upper surface of the vertical plate 18 as an extension of the upper flange plate 15, and a lower plate 20 joined to the lower surface of the vertical plate 18 as an extension of the lower flange plate 16. And a vertical plate 18, an upper plate 19 and a lower plate 20.
Two bolt insertion holes 21 and 21 penetrating through are formed to be spaced apart in the front and rear directions.

Reference numerals 22 and 22 denote left and right weight support portions as second weight support portions, and the left and right weight support portions 22 are located on both sides in the left and right directions with the center side weight support portion 17 interposed therebetween. It is provided at the rear end of the revolving frame 4 so as to be positioned, and supports the counterweight 7 together with the center-side weight support portion 17.

Here, the left and right weight support portions 22
Extends in the front and rear directions in parallel with the center frame 9,
A vertical plate 23 having a front end side joined to the overhanging beam 11 and a rear end side protruding rearward of the rear end beam 12, and a long plate-like upper plate 2 joined to the upper and lower surfaces of the vertical plate 23 by welding or the like.
4 and the lower plate 25, the vertical plate 23, the upper plate 24
And two bolt insertion holes 26, 2 penetrating the lower plate 25
6 are spaced apart in the front and rear directions.

27, 27, ... are weight supporting portions 17 on the center side of the revolving frame 4 and weight supporting portions 2 on the left and right sides.
4 shows four lower mounts as concave portions formed on the lower surface side of the counterweight 7 for accommodating 2. Each lower mount 27 is opened at the lower end side by a steel plate material or the like as shown in FIGS. It is formed in a box shape having a “U” -shaped cross section. Further, two bolt insertion holes 27B (only one is shown) are formed in the upper plate portion 27A of each lower mount 27 so as to be spaced apart in the front and rear directions.
On the upper side of A, a screw seat 2 located in the counterweight 7 and having a screw hole coaxial with each of the bolt insertion holes 27B is formed.
8 and 28 are fixed to each other by means such as welding.

The counterweight 7 accommodates the central weight support 17 and the left and right weight support 22 of the revolving frame 4 in the lower mount 27 thereof, and the central weight is mounted via the mounting bolts 29. It is adapted to be fixed to the supporting portion 17 and the left and right weight supporting portions 22.

In the present embodiment constructed as described above, first, the center side weight supporting portion 17 and the left and right side weight supporting portions 22 of the revolving frame 4 are accommodated in the respective lower mounts 27 of the counterweight 7, and the counter is mounted. The weight 7 is placed on each of the weight supporting portions 17 and 22. Then, the bolt insertion holes 21 of the center side weight support portion 17 and the bolt insertion holes 26 of the left and right weight support portions 22.
And the bolt insertion holes 27B provided in the lower mounts 27 of the counterweight 7 are aligned with each other, the mounting bolts 29 are inserted from the lower side of the weight support portions 17 and 22 to screw holes of the screw seats 28. The weight support part 17 on the center side and the weight support parts 22 on the left side and the right side
Fix the counterweight 7 on top.

Thus, the counterweight 7 is configured to be supported by the central weight support portion 17 and the left and right weight support portions 22 provided on the left and right sides of the central weight support portion 17, respectively. , For example, the counter weight 7 is provided only by the center side weight support portion 17.
In comparison with the case where the counterweight 7 is supported,
The support interval in the right direction is increased, and the rolling of the counterweight 7 during traveling of the hydraulic excavator 1 or during excavation work can be suppressed.

As a result, the vibration propagating from the counterweight 7 to the driver's cab 5 via the turning frame 4 can be effectively reduced, and the riding comfort of the operator in the driver's cab 5 and the operability of the operating lever are greatly improved. can do.

Further, by suppressing the vibration from the counterweight 7 from being transmitted to the revolving frame 4 with a large amplitude, it is possible to prevent a large stress from acting on the center side weight supporting portion 17 and the left and right side weight supporting portions 22 and the like. Therefore, the mechanical strength of each of the weight supporting portions 17 and 22 can be secured, and stable operation of the hydraulic excavator 1 can be compensated for a long period of time.

Moreover, the counterweight 7 is provided with the center side weight supporting portion 17 and the left and right side weight supporting portions 22.
By providing a lower mount 27 having a concave shape for accommodating the weights, the weight supporting portions 17 and 22 are attached to the counterweight 7.
Can be shielded from the outside by a hydraulic excavator 1
The appearance beauty of can be kept good.

Next, FIGS. 6 to 10 show a second embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a revolving frame according to the present embodiment, and the revolving frame 31 is similar to the revolving frame 4 according to the first embodiment, in which a center frame 9, side frames 10, extension beams 11 and The rear end beam 12 and the like form a skeletal structure, and the center frame 9 has a pair of center-side weight supporting portions 17 on the rear side thereof.
17 are provided. An upper weight support portion 32, which is located above the central weight support portion 17 and serves as a second weight support portion to be described later, is provided at the rear end portion of the revolving frame 31.

Reference numerals 32 and 32 denote a pair of upper weight supporting portions provided at the rear end of the revolving frame 31 so as to be located above the central weight supporting portion 17, and the upper weight supporting portion 32 has a central portion. The counter weight 39, which will be described later, is supported together with the side weight support portion 17.

The upper weight support portion 32 has a front end side extending downwardly joined to the upper flange plate 15 of the center frame 9 by welding or the like, and a rear end side of the upper weight support portion 32 in parallel with the center side weight support portion 17 toward the rear side. The extended “L” -shaped support beams 33, 33, and a gate that is positioned between the other end side of each of the support beams 33 and the center-side weight support portion 17 and is erected on the rear end beam 12. It is constructed with a rigid frame structure from the mold reinforcing plate 34.

The other end side of each support beam 33 protruding from the reinforcing plate 34 is connected to the vertical plate 35 joined to the rear surface of the reinforcing plate 34 by welding or the like, and to the rear of the reinforcing plate 34 as an extension of the supporting beam 33. The vertical plate 35 and the upper plate 36 are composed of an upper plate 36 protruding and joined to the upper face of the vertical plate 35, and a lower plate 37 facing the upper plate 36 and joined to the lower face of the vertical plate 35.
And two bolt insertion holes 38, 3 penetrating the lower plate 37
8 are spaced apart in the front and rear directions.

Reference numeral 39 denotes a counterweight used in this embodiment, and the counterweight 39 is shown in FIGS.
As shown in FIG. 2, when supported by the center side weight support portion 17 and the upper side weight support portion 32 of the revolving frame 31, the two lower mounts 27 and 27 for housing the center side weight support portion 17 and the upper side weight support portion. Two upper mounts 40, 40 as recesses that accommodate the portion 32
Each of the upper mounts 40 is formed of a steel plate material or the like into a box shape having a “U” -shaped cross section with an open upper end.

Then, as shown in FIGS. 9 and 10, between the upper end side of each upper mount 40 and the upper surface plate of the counterweight 39, a pair of engagement grooves with which a lid 43 described later is engaged. 41, 41 are provided extending in the front and rear directions. Further, two bolt insertion holes 40B (only one is shown) are formed in the lower plate portion 40A of each upper mount 40 so as to be spaced apart in the front and rear directions, and below the lower plate portion 40A, Screw seats 42, 42 located inside the counterweight 39 and having screw holes coaxial with the respective bolt insertion holes 40B are fixed by means of welding or the like.

Reference numerals 43 and 43 denote lids for closing the upper end side openings of the respective upper mounts 40. As shown in FIG. 10 and the like, the respective lids 43 have an engaging plate portion 43 whose both ends in the width direction are thin.
A, 43A, and the engagement plate portions 43A engage with the engagement grooves 41 to close the upper end side openings of the upper mounts 40. As a result, the upper weight support portion 32 housed in each upper mount 40 can be shielded from the outside.

In this embodiment having such a configuration, first, the central weight supporting portion 17 and the upper weight supporting portion 32 of the revolving frame 31 are housed in the lower mounts 27 and the upper mounts 40 of the counterweight 39. To do. Then, the mounting bolt 29 inserted from the lower side of the central weight support portion 17 is screwed into the screw hole of the screw seat 28, and the mounting bolt 29 inserted from the upper side of the upper weight support portion 32 is screwed into the screw hole of the screw seat 42. The counterweight 39 is fixed on each of the weight supporting portions 17 and 32 by being screwed on. After that, by closing the upper end side opening of each upper mount 40 with the lid 43, the upper weight support portion 32 housed in each upper mount 40 is shielded from the outside.

Thus, the counterweight 39 is supported by the central weight supporting portion 17 and the upper weight supporting portion 32 provided above the central weight supporting portion 17, so that, for example, only the central weight supporting portion 17 is provided. As compared with the case where the counterweight 39 is supported by the above, the vertical support interval of the counterweight 39 is increased, and the vertical swing of the counterweight 39 during traveling of the hydraulic excavator 1 and excavation work can be suppressed.

As a result, the vibration propagating from the counterweight 39 to the cab 5 via the swivel frame 31 can be effectively reduced, and the ride comfort of the operator in the cab 5 and the operability of the operating lever are greatly improved. can do.

Moreover, the counterweight 39 is provided with a concave lower mount 27 for accommodating the central weight supporting portion 17 and a concave upper mount 40 for accommodating the upper weight supporting portion 32. Since the upper end opening of 40 is closed by the lid 43, the weight support portions 17 and 32 are attached to the counterweight 3 respectively.
It can be shielded from the outside by 9, and the appearance beauty of the hydraulic excavator 1 can be kept good.

Next, FIGS. 11 and 12 show a third embodiment according to the present invention. In this embodiment, the same components as those in the above embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the drawing, reference numeral 51 denotes a revolving frame according to this embodiment, which revolving frame 51 comprises a center frame 9, side frames 10, overhanging beams 11 and rear end beams 12 in a skeletal structure. A center side weight support portion 17 is provided on the rear side of the center frame 9. Then, at the rear end of the revolving frame 51, as the second weight supporting portion, left and right sides on both sides in the left and right directions with respect to the center side weight supporting portion 17 as in the first embodiment, The right weight support portion 22 and the upper weight support portion 32 located above the central weight support portion 17 are provided as in the second embodiment.

Reference numeral 52 is a counterweight according to the present embodiment. As shown in FIG. 12, the counterweight 52 is composed of a center side weight support 17, a left side and a right side weight support 22 and an upper weight support 32 of the revolving frame 51. When being supported, the first weight supporting portion 17 and the left and right weight supporting portions 22 are accommodated.
4 lower mounts 27, 27, ...
And two upper mounts 40, 40 which house the upper weight support 32 and are similar to those of the second embodiment.

In this embodiment constructed as described above, first, the central weight supporting portion 17, the left and right weight supporting portions 22, and the upper weight supporting portion 32 of the revolving frame 51 are connected to the lower mounts 27 of the counterweight 52. The counter weight 52 is placed on each of the weight supporting portions 17, 22, 32 while being housed in each of the upper mounts 40. Then, the mounting bolts 29 inserted from the lower side of each of the central weight support portions 17 and the left and right weight support portions 22 are screwed into the screw holes of the screw seat 28, and the mounting bolts inserted from the upper side of the upper weight support portion 32. Bolt 29
The counterweight 52 is fixed on each of the weight support portions 17, 22, 32 by screwing into the screw hole of the screw seat 42. Thereafter, by closing the upper end opening of the upper mount 40 with the lid 43, the upper weight support portion 32 housed in the upper mount 40 is shielded from the outside.

Thus, the counterweight 52 includes the central weight supporting portion 17 and the central weight supporting portion 17
The left and right weight support portions 22 are provided on both sides in the left and right directions, and the upper weight support portion 32 is provided above the central weight support portion 17. Thereby, for example, the center side weight support 1
As compared with the case where the counterweight 52 is supported only by 7, the support intervals in the left and right directions of the counterweight 52 are increased by the amount of providing the left and right weight support portions 22, and the upper weight support portion 32 is The support interval in the upward and downward directions of the counterweight 52 increases by the amount provided.

As a result, it is possible to suppress the rolling and pitching of the counterweight 52 when the hydraulic excavator 1 is running or during excavation work, and the vibration propagating from the counterweight 52 to the operator cab 5 via the turning frame 51 is suppressed. It can be reduced more effectively, and the riding comfort of the operator in the cab 5 and the operability of the operating lever can be greatly improved.

Further, by suppressing the vibration from the counterweight 52 from being transmitted to the revolving frame 51 with a large amplitude, a large stress is exerted on the center side weight supporting portion 17, the left and right weight supporting portions 22, the upper weight supporting portion 32 and the like. Can be prevented, so that the mechanical strength of each of the weight support portions 17, 22, 32 can be secured, and stable operation of the hydraulic excavator 1 can be compensated for a long period of time.

Moreover, the counterweight 52 has a recessed lower mount 27 for accommodating the central weight support 17 and the left and right weight supports 22, and a recessed upper mount 40 for accommodating the upper weight support 32. Further, since the upper end opening of the upper mount 40 is closed by the lid 43, the weight support parts 17, 22, 32 can be shielded from the outside by the counterweight 52, and the hydraulic excavator 1 The appearance beauty of can be kept good.

Next, FIGS. 13 and 14 show a fourth embodiment according to the present invention. In this embodiment, the same components as those in the above embodiments are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 61 denotes a swivel frame according to this embodiment, and the swivel frame 61 is composed of a center frame 9, side frames 10, overhanging beams 11, and a rear end beam 12 in a skeletal structure. A central weight supporting portion 17 is provided on the rear side of the center frame 9. The left and right weight support parts 22 and the upper weight support part 32 are provided as second weight support parts at the rear end of the revolving frame 61.
Further, a pair of upper left and upper right weight supporting portions 62, 62 described later are provided on both sides of the central weight supporting portion 17 in the upper left and upper right directions.

Reference numerals 62 and 62 denote upper left and upper right weight support portions provided at the rear end of the revolving frame 61 so as to be located on the upper left and upper right sides of the center weight support portion 17, respectively. In the side and upper right weight support portions 62, the front end side that extends downward is joined to the overhanging beam 11 by welding or the like, and the rear end side is the left and right weight support portions 22.
Substantially "L" -shaped support beams 63, 63 extending in parallel to the rear side, and the other end side and left side of each support beam 63,
Located between the right weight support 22 and the rear beam 1
2 and a gate-shaped reinforcing plate 64 that is erected on the upper part of the upper part 2 and has a firm frame structure. The reinforcing plate 64 supports not only the support beams 63 of the upper left and upper right weight support portions 62 but also the support beams 33 of the upper weight support portion 32.

The other end of each supporting beam 63 protruding from the reinforcing plate 64 is connected to the vertical plate 65 joined to the rear surface of the reinforcing plate 64 by welding or the like, and is provided behind the reinforcing plate 64 as an extension of the supporting beam 63. The vertical plate 65 and the upper plate 66 are composed of an upper plate 66 protruding and joined to the upper face of the vertical plate 65, and a lower plate 67 facing the upper plate 66 and joined to the lower face of the vertical plate 65.
And two bolt insertion holes 68, 6 penetrating the lower plate 67
8 are spaced apart in the front and rear directions.

Reference numeral 69 is a counterweight according to the present embodiment. As shown in FIG. 14, the counterweight 69 includes a center side weight supporting portion 17, a left side and a right side weight supporting portion 22, an upper side weight supporting portion 32, and an upper weight supporting portion 32 of the revolving frame 61. When supported by the upper left and upper right weight support portions 62, four lower mounts 27 that house the central weight support portion 17 and the left and right weight support portions 22,
27, and four upper mounts 40, 40, ... For accommodating the upper weight support 32 and the upper left and upper right weight supports 62.

In this embodiment having such a configuration, the center side weight support portion 17, the left and right side weight support portions 22, the upper side weight support portion 32 and the upper left side and upper right side weight support portions 62 of the revolving frame 61 are The counterweight 69 is housed in each lower mount 27 and each upper mount 40 of the counterweight 69, and the counterweight 69 is fastened to the weight support portions 17, 22, 32, 62 via the mounting bolts 29, whereby the revolving frame 61 is secured. The counterweight 69 is fixed to the rear end side. Then, by closing the opening on the upper end side of the upper mount 40 with the lid 43, the upper weight support portion 3 housed in the upper mount 40.
2 and the upper left and right upper weight support portions 62 can be shielded from the outside.

Thus, the counterweight 69 includes the central weight supporting portion 17 and the central weight supporting portion 17
The left and right weight support portions 22 provided on both sides in the left and right directions, the upper weight support portion 32 provided on the upper side with respect to the central weight support portion 17, and the central weight support portion 17. On the other hand, it is supported by upper left and upper right weight support portions 62 provided on both sides in the upper left and upper right directions. As a result, the support intervals of the counterweight 69 in the left, right, up, and down directions are increased, and the support rigidity for the counterweight 69 is also increased by attaching the upper left and upper right weight support portions 62. You can

As a result, the counterweight 69 is reliably suppressed from rolling and pitching of the counterweight 52 during traveling of the hydraulic excavator 1 and excavation work.
The vibration propagating to the driver's cab 5 through the swivel frame 61 can be more effectively reduced, and the riding comfort of the operator in the driver's cab 5 and the operability of the operating lever can be significantly improved.

Further, by reliably suppressing the vibration from the counterweight 69 from being transmitted to the revolving frame 61 with a large amplitude, the weight supporting portions 17, 22, 32, 6 are provided.
The mechanical strength of 2 can be secured, and the stable operation of the hydraulic excavator 1 can be compensated for a longer period of time.

In each of the above-described embodiments, the hydraulic excavator has been described as an example of the construction machine, but the present invention is not limited to this, and other construction machines equipped with counterweights such as hydraulic cranes and earth augers can be used. Can also be applied.

[0067]

As described above in detail, according to the first aspect of the invention, the first weight support portion provided at the rear end portion of the main body frame at the center position in the left and right directions, and the first weight. Since the counterweight is configured to be supported by the second weight support portions located on both sides of the support portion at least in the left, right direction or upper direction, the counterweight is supported in the left, right direction or upper direction, lower direction of the counterweight. The support interval is increased, and it is possible to suppress the vibration of the counterweight centering on the attachment position with each weight support portion.

According to the second aspect of the present invention, a pair of center side weight support portions provided at the rear end of the body frame at the center positions in the left and right directions, and the left and right sides of the center side weight support portions.
Left side of the body frame located on both right side,
By supporting the counterweight with the right-side weight support section, the support interval in the left and right directions of the counterweight is increased, so that rolling of the counterweight is effective when the construction machine is running or during excavation work. Can be suppressed. As a result, the vibration propagating from the counterweight to the driver's cab or the like via the main body frame can be effectively reduced, and the ride comfort of the operator in the driver's cab and the operability of the operating lever can be improved.

According to the third aspect of the present invention, the pair of center side weight support portions and the pair of upper side weight support portions located above the center side weight support portions and provided at the rear end portions of the main body frame. Since the counterweight is supported by and the support interval in the upward and downward directions of the counterweight is increased, it is possible to effectively suppress the pitching of the counterweight during traveling of the construction machine or during excavation work. You can As a result, the vibration propagating from the counterweight to the driver's cab or the like via the main body frame can be effectively reduced, and the ride comfort of the operator in the driver's cab and the operability of the operating lever can be improved.

Further, according to the invention of claim 4, a pair of center side weight support portions, and left and right sides provided at the rear end portions of the body frame located on both left and right sides of the center side weight support portions. By supporting the counterweight by the weight support portion and a pair of upper weight support portions located above the center weight support portion and provided at the rear end portion of the body frame, the counterweight is moved in the left, right, and upper directions. ，
Since the support interval in the downward direction is increased, it is possible to reliably suppress rolling and pitching of the counterweight when the construction machine is running or during excavation work. As a result, the vibration propagating from the counterweight to the driver's cab or the like via the main body frame can be more effectively reduced, and the riding comfort of the operator in the driver's cab and the operability of the operating lever can be significantly improved.

Moreover, by suppressing the vibration from the counterweight transmitted to the main body frame with a large amplitude, it is possible to prevent a large stress from acting on each weight support portion which supports the counterweight. Strength can be secured, and stable operation of the construction machine can be compensated for a long period of time.

According to the invention of claim 5, in addition to the pair of center side weight support portions, the left side and the right side weight support portions and the pair of upper side weight support portions, the upper left side and the upper right side with respect to the center side weight support portions. By supporting the counterweight by the upper left side and upper right side weight support portions provided on the side,
Not only can the support interval in the downward direction be increased, but also the support rigidity for the counterweight can be improved, and the counterweight can be firmly supported.

According to the sixth aspect of the present invention, the counterweight is provided with the recessed portion for accommodating the respective weight supporting portions so that the respective weight supporting portions are shielded from the outside by the counterweight while supporting the counterweight. Because of the configuration, the appearance of the construction machine can be kept good.

[Brief description of drawings]

FIG. 1 is an external view showing a hydraulic excavator as a construction machine according to the present invention.

FIG. 2 is an exploded perspective view showing a swivel frame and a counterweight according to the first embodiment.

FIG. 3 is an enlarged rear view showing the counterweight according to the first embodiment.

FIG. 4 is a vertical cross-sectional view of a part cut along the arrow IV-IV direction in FIG.

5 is a partial cross-sectional view as seen from the direction of arrows VV in FIG.

FIG. 6 is a perspective view showing a main part of a revolving frame according to a second embodiment.

FIG. 7 is an enlarged rear view showing the counterweight according to the second embodiment.

FIG. 8 is a vertical cross-sectional view of a part cut along the arrow VIII-VIII direction in FIG. 7.

9 is a partial cross-sectional view as seen from the direction of arrows IX-IX in FIG.

10 is a counter weight shown in FIG. 9, an upper mount,
FIG. 3 is a partially cutaway perspective view showing a lid and the like.

FIG. 11 is a perspective view showing a main part of a revolving frame according to a third embodiment.

FIG. 12 is an enlarged rear view showing the counterweight according to the third embodiment.

FIG. 13 is a perspective view showing a main part of a revolving frame according to a fourth embodiment.

FIG. 14 is an enlarged rear view showing the counterweight according to the fourth embodiment.

[Explanation of symbols]

4, 31, 51, 61 Revolving frame (main body frame) 7, 39, 52, 69 Counterweight 8 Working device 17 Center side weight support portion (first weight support portion) 22 Left and right weight support portions (second Weight support part) 27 Lower mount (concave part) 32 Upper weight support part (second weight support part) 40 Upper mount (concave part) 62 Upper left side, upper right side weight support part (second weight support part)

Claims (6)

[Claims] 1. A main body frame having a skeletal structure, a working device provided on a front side of the main body frame, and a counterweight provided on a rear side of the main body frame for balancing with the working device. In the construction machine, a first weight support portion that supports the counterweight at a central position in the left and right directions at the rear end portion of the main body frame, and at least a left portion with respect to the first weight support portion,
A construction machine provided with a second weight support portion which is located on the right side or on both sides in the upward and downward directions and which supports the counterweight. 2. A main body frame having a skeletal structure, a working device provided on a front side of the main body frame, and a counterweight provided on a rear side of the main body frame for balancing the working device. In the construction machine, a pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions at the rear end portion of the body frame, and left and right with respect to the center-side weight support portions. A construction machine comprising left and right weight support portions located on both sides in the direction to support the counterweight. 3. A main body frame having a skeletal structure, a working device provided on a front side of the main body frame, and a counterweight provided on a rear side of the main body frame for balancing with the working device. In the construction machine, the pair of center side weight support portions that support the counterweight at the center positions in the left and right directions at the rear end portion of the main body frame, and the position above the center side weight support portion. A construction machine comprising: a pair of upper weight support portions that support the counterweight. 4. A body frame having a skeletal structure, a working device provided on the front side of the body frame, and a counterweight provided on the rear side of the body frame for balancing with the working device. In the construction machine, a pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions at the rear end portion of the body frame, and left and right with respect to the center-side weight support portions. Left and right weight support portions located on both sides in the direction to support the counterweight, and a pair of upper weight support portions located above the central weight support portion to support the counterweight. Construction machine characterized by. 5. A body frame having a skeletal structure, a working device provided on a front side of the body frame, and a counterweight provided on a rear side of the body frame to balance the working device. In the construction machine, a pair of center-side weight support portions that support the counterweight at the center positions in the left and right directions at the rear end portion of the body frame, and left and right with respect to the center-side weight support portions. Left and right weight support portions located on both sides in the direction to support the counterweight, a pair of upper weight support portions located above the central weight support portion to support the counterweight, and the central side It is characterized in that an upper left side and an upper right side support frames, which are located on both the upper left side and the upper right side with respect to the weight supporting portion, and which support the counterweight, are provided. Construction machinery that. 6. The counterweight is provided with a recessed portion for accommodating each of the weight supporting portions, and each of the weight supporting portions is shielded from the outside by the counterweight. The construction machine according to item 5.