JP3659521B2 - Upper revolving frame of upper revolving crawler dumper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of an upper swing body frame of an upper swing crawler dumper.
[0002]
[Prior art]
As a conventional crawler dumper, an upper swing type crawler dumper in which a dump carrier can swing with respect to a lower traveling body has been proposed. For example, FIG. 6 shows an upper swing crawler dumper proposed by Japanese Utility Model Laid-Open No. 55-135640, and the outline will be described below with reference to FIG.
[0003]
The upper revolving crawler dumper is provided with an upper revolving body frame 3 that can turn freely on a lower traveling body 1 having crawler belts 8 on the left and right. A driver's cab 4 and an engine room 5 are disposed at the front of the upper swing frame 3 and a dump bed 6 is mounted on the rear of the upper swing frame 3 so as to be raised and lowered. It can be raised and lowered around a horizontal pivot pin 14 a provided at the rear end of the revolving body frame 3. Further, a dump cylinder 7 for raising and lowering the dump truck 6 is rotatably provided between the upper swing frame 3 and the dump truck 6, and the dump cylinder 7 is positioned in the vicinity of the pivot pin 14a. Is attached to the rear part of the upper swing frame 3 by a horizontal pivot pin 7a. Further, in a substantially central portion on the lower traveling body 1, a turning circle 2 having turning inner teeth, and a turning motor equipped with a pinion that meshes with the inner teeth (hereinafter, this turning mechanism is combined with the turning motor). 9), and the swivel circle 2 and the swivel machine 9 can be swung freely.
[0004]
[Problems to be solved by the invention]
In the upper swing type crawler dumper, the rear part of the upper swing body frame 3 from the swing circle 2 has a cantilever structure. That is, particularly when the dump bed 6 is raised and discharged, a load is applied to the rear end portion of the upper swing frame 3 to which the pivot pin 7a of the dump cylinder 7 and the pivot pin 14a of the dump bed 6 are attached. For this reason, the structure of the upper revolving structure frame 3 needs to be able to sufficiently withstand the load when the dump truck 6 is loaded, the impact during the traveling of the load, and the like. At the same time, there is a strong demand for lowering the overall height of the vehicle in order to regulate the height of the loaded vehicle when the upper turning crawler dumper is carried on a trailer vehicle.
However, none of the above-described conventional proposals particularly describe the structure of the upper swing frame 3.
[0005]
The present invention has been made in view of the above problems, and can provide sufficient strength with respect to cantilever loads such as a rear dump bed and a front driver's cab from the turning center, and reduce the overall height of the vehicle. It is an object of the present invention to provide an upper revolving frame of an upper revolving crawler dump that can be used.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the upper swing body frame of the upper swing type crawler dump truck according to the present invention has the upper swing body frame 3 rotatably mounted on the lower traveling body 1 and the upper swing body frame 3 has the cab. 4, the engine room 5, and the dump truck bed 6, the upper swing body frame 3 includes two left and right beams 13 that are mounted on the dump truck bed 6 so as to be raised and lowered and extend to the rear. And a front deck 20 in which the cab 4 and the engine room 5 are disposed, and the height (h) of the frame constituting the front deck (20) of the upper swing frame (3) is set to the beam ( It is configured to be lower than the height (H ) of 13) .
[0007]
As described above, the upper swing frame has the left and right beams on the rear side and the front deck on the front side. Therefore, sufficient strength is ensured even in a cantilever structure. In addition, the front deck has a lower front deck than the rear beam, and the height of the cab in front of the upper swing frame is lower, so the overall height of the upper swing crawler dumper can be reduced. It becomes.
[0008]
Further, the swivel circle 2 is arranged at a substantially central portion of the upper swing body frame 3 and in front of the two left and right beams 13.
In addition, the upper revolving structure frame 3 is configured such that the left and right beams 13 are fixed to the left and right ends of the swivel device mounting plate 10 to which the swivel circle 2 is mounted.
The two left and right beams 13 of the upper swing frame 3 are fixed to the swivel device mounting plate 10 so as to substantially overlap both left and right ends of the swivel circle 2.
The left and right two beams 13 of the upper swing frame 3 are connected by two front and rear crossbars 16 and 17, and the front crossbar 16 is the swivel device mounting plate. 10 is fixed.
[0009]
As described above, the rear part of the upper revolving structure frame includes the two left and right beams and a plurality of crossbars connecting the two beams, and at least one of the plurality of crossbars swivels. Connected to the device mounting plate. Therefore, the cantilever load at the rear of the upper swing frame is supported by a frame having a simple structure and sufficient strength.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Below, the Example of the upper turning body frame which concerns on this invention is explained in full detail, referring FIGS. 1-5.
FIG. 1 is an overall side view of the upper swing type crawler dumper. An upper swing body frame 3 is turnably mounted on the upper surface of a substantially central portion of the lower traveling body 1 having the crawler belts 8 on the left and right via a swing circle 2 and a swing machinery 9. A driver's cab 4 and an engine room 5 are disposed in the front part of the upper swing body frame 3, and a dump bed 6 is mounted on the rear part so as to be raised and lowered. The dump bed 6 can be raised and lowered around a horizontal pivot pin 14 a provided at the rear end of the upper swing frame 3.
[0017]
2 and 3 show a plan view and a side view of the upper swing body frame 3, respectively, and FIG. 4 is a front view as seen from A in FIG. Hereinafter, a description will be given with reference to FIGS.
A swivel device mounting plate 10 having a swivel circle mounting seat 11 and a swiveling machine mounting seat 12 is disposed at a substantially central portion of the upper swing body frame 3. Two beams 13 and 13 having a box cross-sectional shape extending to the rear part of the upper swing body frame 3 are fixed to the left and right ends of the swivel device mounting plate 10. Further, brackets 15 having pin holes 14 into which pivot pins 14a serving as undulation fulcrums of the dump truck 6 are inserted are respectively fixed to the rear ends of the two left and right beams 13 and 13. The two left and right beams 13 and 13 are located inside the left and right ends of the swivel circle 2 attached to the swivel circle mounting seat 11 of the swivel device mounting plate 10.
[0018]
The left and right beams 13 and 13 are connected by a plurality of crossbars, and in this embodiment, they are connected by two crossbars 16 and 17. At least one of the crossbars 16 is fixed to the rear end portion of the swivel device mounting plate 10.
[0019]
The left and right beams 13 and 13 have a height H that has a strength sufficient to withstand this load even when the dump carrier 6 loaded with the load is mounted and the load is discharged. And it is comprised so that plate | board thickness may be satisfied.
[0020]
A front deck 20 is disposed in front of the swivel device mounting plate 10. The front deck 20 includes two central frame bodies 21 and 21 extending in front of the upper swing body frame 3, left and right frame bodies 22 and 22, and left and right directions provided at the front end portions of these frame bodies. Frame body 23. The frame body 21, the frame body 22, and the frame body 23 have a height h lower than the height H of the beam 13 and have the same box cross-sectional shape as the beam 13. Further, the rear end portion of the front deck 20 includes a center standing plate 24 fixed to the front portion of the swivel device mounting plate 10, and a right standing plate 25 and a left standing plate 26 fixed to both left and right ends of the center standing plate 24. And are connected to the two beams 13, 13.
The center standing plate 24 is located behind the front end of the turning circle 2 attached to the turning circle attachment seat 11 of the turning device attachment plate 10.
[0021]
The right beam 13 and the right standing plate 25 are connected by a rib 27, and the left beam 13 and the left standing plate 26 are connected by a battery case 28.
The driver's cab 4 is mounted on the front deck 20, but the overall height of the vehicle is low because the heights h of the frames 21, 22, and 23 are low.
[0022]
FIG. 5 is a cross-sectional view taken along the line B-B of FIG.
The two central frames 21, 21 of the front deck 20 are connected by a cross bar 34. The cross bar 34 and the center standing plate 24 are connected by a swash plate 31. Further, a lower surface plate 32 is fixed to the lower surfaces of the two central frames 21, 21. Further, a portion surrounded by both end portions of the swash plate 31, the upper surface end of the central frame 21 and the central standing plate 24 is fixed by a triangular side plate 33. As described above, the central standing plate 24, the swash plate 31, the cross bar 34, the lower surface plate 32, and the triangular side plate 33 form a box shape to constitute the connecting portion 30.
[0023]
As described with reference to FIG. 1, the cab 4 is mounted on the left side of the front deck 20 and the engine room 5 is mounted on the right side. Therefore, the front deck 20 has a cantilever structure. As a result, a large stress is generated in the connecting portion 30 between the central standing plate 24 on the base end side of the front deck 20 and the swivel device mounting plate 10, but the two beams 13, 13 are connected to each other by the box structure of the connecting portion 30. The stress concentration generated at the connecting portion with the central frame bodies 21, 21 is alleviated.
[0024]
Further, the stress concentration between the right beam 13 and the right standing plate 25 is also reduced by the rib 27, and the stress concentration between the left beam 13 and the left standing plate 26 is also reduced by the battery case 28.
[0025]
Further, the positions where the left and right beams 13 and 13 and the center stand 24 are fixed to the swivel device mounting plate 10 are arranged so as to be inside the outer peripheral end of the swivel circle 2 attached to the swivel circle mounting seat 11. . For this reason, the vertical load of the cab 4, the engine room 5, the dump bed 6, etc. is directly applied to the turning circle 2, and the bending force applied to the turning device mounting plate 10 is reduced. Therefore, the overall rigidity is extremely high.
[0026]
【The invention's effect】
Since the upper revolving structure frame according to the present invention is configured as described in detail above, sufficient strength can be secured even with a cantilever structure by a simple structure. In addition, since the height of the operator cab in front of the upper swing frame is reduced, the overall height of the upper swing crawler dump can be reduced, and the transportability can be improved.
[0027]
Since the stress concentration in the vertical direction generated at the connecting portion between the standing plate and the front deck constituted by the frame body having a low front height is reduced, durability can be improved.
In addition, the cantilever load at the rear of the upper swing frame is simple and can be supported by a frame that has sufficient strength. Since the concentration of the generated stress in the left-right direction is relaxed, durability can be improved.
Furthermore, since the load of a driver's cab, an engine room, and a dump bed can be directly transmitted to a turning circle, sufficient durability can be secured at the joint with the turning circle.
[Brief description of the drawings]
FIG. 1 is an overall side view of an upper swing crawler dump truck according to the present invention.
FIG. 2 is a plan view of an upper swing frame according to the present invention.
FIG. 3 is a side view of an upper swing frame according to the present invention.
FIG. 4 is a front view of an upper swing body frame according to the present invention.
5 is a cross-sectional view taken along the line BB of the connecting portion in FIG.
FIG. 6 is an overall side view of an upper swing type crawler dump truck representing a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Turning circle 3 Upper turning body frame 4 Driver's cab 5 Engine room 6 Dump loading platform 7 Dump cylinder 7a Pivot pin 8 Crawler belt 9 Turning machinery 10 Turning device mounting plate 11 Turning circle mounting seat 12 Turning machinery mounting seat 13 Beam 14 Pin hole 14a Pivot pin 15 Bracket 16, 17 Cross bar 20 Front deck 21, 22, 23 Frame 24 Center standing plate 25 Right standing plate 26 Left standing plate 27 Rib 28 Battery case 30 Connecting portion 31 Swash plate 32 Lower surface plate 33 Side plate 34 Crossbar

Claims (5)

The upper swing frame (3) is pivotably mounted on the lower traveling structure (1), and the cab (4), engine room (5), and dump bed (6) are mounted on the upper swing structure frame (3).
In the upper swirl crawler dumper, the upper swivel frame (3) is mounted with a dump bed (6) that can be raised and lowered, two left and right beams (13) extending to the rear, and a cab ( Four)
And a front deck (20) provided with an engine room (5) , the height (h) of the frame constituting the front deck (20) of the upper swing frame (3) is set to the beam (13 upper rotating body frame of the upper rotating crawler dump, characterized in that it has less than the height (H) of). Wherein a substantially central portion of the upper swing body frame (3), according to claim 1, characterized in that the swivel circle (2) is arranged in front of the right and left two beams (13) Upper revolving frame of upper revolving crawler dumper. The upper revolving body frame (3) is characterized in that the left and right two beams (13) are fixed to both left and right ends of a swivel device mounting plate (10) to which a revolving circle (2) is attached. The upper revolving structure frame of the upper revolving crawler dump according to claim 2 . The two left and right beams (13) of the upper swing frame (3) are fixed to the swivel device mounting plate (10) so as to substantially overlap both left and right ends of the swivel circle (2). The upper revolving structure frame of the upper revolving crawler dump according to claim 3 characterized by things. The rear part of the upper swing frame (3) is composed of the two left and right beams (13) and a plurality of cross bars connecting the two left and right beams (13). The upper revolving unit frame of the upper revolving crawler dump according to claim 4 , wherein at least one is connected to the revolving device mounting plate (10).

Images