JP2007055445A - Cab and working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cab equipped with an enhanced strength against a lateral load applied to the cab side face by enhancing the stiffness of a rear panel provided in the rear of the cab. <P>SOLUTION: The cab 16 is equipped with front pillars 21 installed on the left and right ranging from the cab front to its over-part and rear pillars 22 installed on the left and right in the rear of the cab. A back window 23 is provided between the upper parts of the left and right rear pillars 22, while a rear panel 24 is installed between the lower parts. The rear panel 24 is structured so that a hollow stretching in the horizontal direction is formed inside the panel body having a closed section formed in a hollow box shape, in which the two ends on the left and right are left open, and these left and right open edges are welded to the left and right rear pillars 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cab having improved strength against a lateral load and a work machine on which the cab is installed.

  As shown in FIG. 7, in the excavator, an upper swing body 2 is turnably provided on a lower traveling body 1, and a cab 3 and a work device 4 are mounted on the upper swing body 2. Since this type of work machine works even on rough terrain and sloping terrain, it may possibly roll over depending on the turning angle of the upper turning body 2, the working posture of the working device 4, the bucket load, and the like.

  In this case, as shown in FIG. 7, since the lateral load F acts on the upper side surface of the cab 3 from the side opposite to the working device 4, it is necessary to reinforce the cab or improve the rigidity of the cab. . When the machine rolls over to the right side in FIG. 7, the highly rigid working device 4 receives a lateral load before the cab 3, so there is no need to consider the lateral load acting on the cab 3.

As means for improving the cab strength against the lateral load F, as shown in FIGS. 8 and 9, a mounting plate such as a controller or a washer tank is provided below the rear panel 6 provided between the left and right rear pillars 5. There is a structure in which the outer panel 7 also serving as a spot is welded. Alternatively, there is a rear panel at the rear of the cab in which plate wall portions of protective members are arranged in parallel (see, for example, Patent Document 1).
JP 2004-76383 A (page 4-6, FIGS. 4 and 6)

  In the conventional structure in which the outer panel 7 is spot welded to the lower part of the rear panel 6 or the plate wall part is disposed in parallel to the rear panel at the rear of the cab, the rigidity of the rear panel structure is not sufficient, and the cab strength against the lateral load F is also sufficient. Not.

  The present invention has been made in view of the above points, and provides a cab having improved strength against a lateral load applied to the side of the cab by improving the rigidity of the rear panel at the rear of the cab, and a work machine equipped with the cab. For the purpose.

  According to the first aspect of the present invention, the cab adjacent to the working device includes left and right rear pillars provided at the rear portion of the cab, and a rear panel formed in a hollow box shape provided between the lower portions of the left and right rear pillars. It is a cab.

  According to a second aspect of the present invention, the rear panel of the cab according to the first aspect is divided into a plurality of hollow box shapes.

  According to a third aspect of the present invention, in the cab according to the first or second aspect, a part of the rear panel formed in a hollow box shape can be opened to the outside to be a storage portion.

  The invention according to claim 4 protects the machine main body, the working device mounted on the machine main body, and an operator that is installed in the machine main body adjacent to the working device and operates the machine main body and the working device. It is a working machine provided with the cab described in any one of.

  According to the first aspect of the present invention, the rear panel formed in a hollow box shape can increase the section modulus of the rear panel and improve the rigidity, thereby increasing the cab strength against a lateral load acting on the side surface of the cab. .

  According to the second aspect of the present invention, the rear panel divided into a plurality of hollow box shapes has higher rigidity than the single hollow box shape rear panel, and can further increase the strength against a lateral load acting on the cab side surface. .

  According to the third aspect of the invention, the internal space of the rear panel formed in the shape of a hollow box is used as the storage portion, so that the internal space can be effectively used.

  According to the fourth aspect of the present invention, when the work machine rolls around the longitudinal axis of the machine body, even if a lateral load acts on the cab from the side without the work device, the hollow box shape is formed. Since the strength of the rear portion of the cab is improved by the formed rear panel, deformation of the cab can be reliably suppressed.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS. 1 to 4, another embodiment shown in FIG. 5, and still another embodiment shown in FIG. 6. To do.

  First, an embodiment shown in FIGS. 1 to 4 will be described. FIG. 4 shows a hydraulic excavator 11 as a work machine. The machine body 12 includes a lower traveling body 13 and the lower traveling body 13. The upper revolving body 14 is provided on the upper revolving body 14 of the machine body 12, and a work device 15 used for excavation work is installed on the upper revolving body 14 of the machine body 12 and adjacent to the work device 15 A cab 16 that protects an operator who operates the machine body 12 and the work device 15 is installed on the upper swing body 14 of the machine body 12.

  The working device 15 includes a boom 17 disposed adjacent to the side of the cab 16 and is pivotally connected to the upper swing body 14 so as to be pivotable in the vertical direction and rotated by a boom cylinder 17c. The arm 18 is pivotally connected to a shaft and rotated by an arm cylinder 18c. A bucket 19 is pivotally connected to the tip of the arm 18 and rotated by a bucket cylinder 19c.

  As shown in FIG. 3, the cab 16 adjacent to the working device 15 is provided with front pillars 21 on the left and right sides from the front of the cab to the top, and left and right rear pillars 22 on the rear of the cab. A rear window 23 is provided between the upper parts of the left and right rear pillars 22, and a rear panel 24 is provided between the lower parts.

  This rear panel 24 has a window frame 26 welded to the top of a panel body 25 having a closed cross-sectional shape formed in a hollow box shape having a closed hollow vertical cross section as shown in FIGS. Thus, a horizontal hollow portion 27 is formed inside the panel body 25, its left and right ends are opened, and the left and right opening edges are welded to the left and right rear pillars 22 as shown in FIG. .

  An opening 28 is provided in a part of the rear pillar 22, and the hollow box-shaped rear panel 24 serves as a storage portion that can be opened to the outside through the opening 28. That is, the object 29 is configured to be detachably accommodated in the hollow portion 27 of the panel body 25. For example, an air conditioner filter for introducing outside air into a suction port of an air conditioner (not shown) installed in the cab 16 can be inserted into and removed from the side of the rear panel 24 through the opening 28 of the rear pillar 22. It is good to leave. In this case, a vent hole (not shown) is formed in the panel body 25 in advance.

  Then, the lower frame 33 of the cab 16 is fixed to the floor plate 32 fixed on the upper swing body 14 via the mounting member 31 as shown in FIG. 2 with bolts (not shown), and as shown in FIG. The bottom of the rear panel 24 is fixed to the floor board 32 with bolts 34.

  Thus, by making the rear panel 24 a hollow box-shaped closed cross-sectional structure, the section modulus of the rear panel 24 can be increased, and the rigidity for preventing deformation of the pair of rear pillars 22 is also improved. Even when a lateral load F acts on the side surface of the cab 16 from the side without the working device 15 when the machine body 12 rolls around the longitudinal axis, the rear panel 24 formed in a hollow box shape provides strength. Due to the improved cab rear portion, the deformation of the cab 16 can be reliably suppressed.

  In addition, the hollow box-shaped rear panel 24 can use the hollow portion 27 as a storage space. The rear panel 24 having a hollow box structure also has soundproofing, vibrationproofing, and heat insulating effects. If the soundproofing material and heat insulating material are filled inside, the effects can be further improved.

  Next, FIG. 5 shows another embodiment, and the rear panel 24 is formed by arranging a plurality of panel main bodies 25 divided into a plurality of hollow box shapes vertically and integrated by welding, The partition plate portion 35 to which the upper and lower panel bodies 25 are welded can further increase the section modulus of the single hollow box-shaped rear panel, and can further improve the rigidity of preventing the pair of rear pillars 22 from being deformed. It is possible to further increase the strength against the lateral load acting on the.

  Next, FIG. 6 shows still another embodiment, and the rear panel 24 is formed by arranging a plurality of panel bodies 25 having different sizes vertically and integrated by welding, and is shown in FIG. The same effect as the rear panel 24 can be obtained, and the lower panel body 25 formed with a large hollow portion 27 has a function as a storage box, not only the air conditioner filter, but also wiring, piping, You may make it accommodate tools. As described above, the internal space of the rear panel 24 formed in a hollow box shape is used as the storage portion, so that the internal space can be effectively used.

  The present invention can be used not only for a cab for a hydraulic excavator but also for a cab for other work machines such as a bulldozer or a loader.

1 is a side sectional view showing an embodiment of a cab according to the present invention. It is sectional drawing of the rear panel of a cab same as the above. It is a perspective view of a cab same as the above. It is a side view of the working machine which concerns on this invention. It is sectional drawing which shows other embodiment of the rear panel of a cab same as the above. It is sectional drawing which shows another embodiment of the rear panel of a cab same as the above. It is a working machine rear view explaining the lateral load applied when a working machine falls and the deformation | transformation of a cab. It is a perspective view which shows the conventional cab. It is the IX-IX sectional view taken on the line of FIG.

Explanation of symbols

12 Machine body
15 Work equipment
16 cab
22 Rear pillar
24 Rear panel

Claims (4)

In the cab adjacent to the work equipment,
Left and right rear pillars at the rear of the cab,
And a rear panel formed in a hollow box shape provided between the lower portions of the left and right rear pillars. The cab according to claim 1, wherein the rear panel is divided into a plurality of hollow box shapes. The cab according to claim 1 or 2, wherein a part of the rear panel formed in the shape of a hollow box is openable to the outside and serves as a storage portion. The machine body,
A working device mounted on the machine body;
A work machine comprising: the cab according to any one of claims 1 to 3 that is installed in a machine main body adjacent to the work device and protects the operator operating the machine main body and the work device.

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