JP2005035316A - Operator cab reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation of a reinforcing structure and to reduce manufacturing cost of the reinforcing structure and an operator cab in a working machine, in an operator cab reinforcing structure provided with a frame-shaped reinforcing structure installed from the outside of the cab by being overlapped on a frame structure for forming the cab on a substantially upper half of the cab. <P>SOLUTION: The reinforcing structure 18a is installed on the frame structure 16 by welding lower parts L1 and L2 in a part located on a side surface of the cab and a part L3 in a part located on a roof surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab reinforcement structure, and more particularly, to a reinforcement structure attachment structure that is attached to be overlapped with a substantially upper half of a cab provided in a work machine.
[0002]
[Prior art]
For example, a hydraulic excavator, which is a typical example of a work machine, stands as a cab protection structure from the fuselage frame in order to protect the operator in the cab against deformation and collapse of the cab when the fuselage falls due to some accident. A cab guard formed so as to cover the operator's cab is attached as necessary (see, for example, Patent Document 1).
[0003]
However, this type of cab guard has problems such as requiring a large space for installation, high cost in structure, and poor visibility of the operator. In order to eliminate this problem, the present inventors have developed a cab reinforcement structure having a frame-shaped reinforcement structure that is attached to the skeleton structure of the cab in the upper half of the cab (for example, a patent) Reference 2).
[0004]
[Patent Document 1]
JP 2001-173017 A (FIG. 1)
[Patent Document 2]
Patent Application No. 2003-144346 (Fig. 2)
[0005]
[Problems to be solved by the invention]
However, the cab reinforcement structure that is attached to the skeleton structure of the cab has the following problems to be solved, although excluding the conventional problems.
[0006]
(1) Difficult to install:
The cab reinforcement structure is integrally attached by welding or the like with the contours of the cab and the reinforcement structure precisely matched. However, since the cab and the reinforcing structure are each manufactured by welding and joining steel plates, steel members, etc., the dimensional error is large, and because of the complicated design shape using curved surfaces, the overlapping parts are unspecified. As a result, the welding position varies, the strength of the welding itself cannot be secured, the strength varies as the cab reinforcement structure, and the function cannot be fully exhibited.
[0007]
In order to match the contours, the operator's cab and / or the reinforcing structure needs to be corrected by means such as pressing, heating, or a grinder. This takes a lot of time and makes it difficult to attach the reinforcing structure. It is more difficult to attach the reinforcing structure to the operator's cab later at the work machine operation site or the work machine delivery destination.
[0008]
(2) High production cost:
If the contours of the driver's cab and the reinforcing structure are matched so as to increase the accuracy of the respective contour dimensions, the manufacturing cost becomes high. In addition, it is not practical to improve the accuracy of the cab contour dimension, which is not so important for matching the contour.
[0009]
Furthermore, this reinforcement structure, which is attached as necessary, is equipped with screw hole members etc. in all the cabs that are provided as standard in work machines so that they can be attached to the cab with bolts. Cost increases.
[0010]
The present invention has been made in view of the above-mentioned facts, and its technical problem is that it is a frame-like structure that is attached from the outside of the operator's cab on the framework structure that forms the operator's cab in the upper half of the operator's cab of the work machine. In a cab reinforcement structure provided with a reinforcement structure, it is easy to attach the reinforcement structure and to reduce the manufacturing cost of the reinforcement structure and the cab.
[0011]
[Means for Solving the Problems]
In the present invention, as a cab reinforcement structure that solves the above technical problem, a frame shape that is attached to the framework structure that forms the cab in the upper half of the cab provided in the work machine and is attached from the outside of the cab. The reinforcing structure is attached to the framework structure by welding a lower part of a part located on the side surface of the cab and a part of the part located on the roof surface. A characteristic cab reinforcement structure is provided.
[0012]
And, by limiting the parts to be welded of the reinforcing structure to the frame structure, the number of parts that require dimensional accuracy is reduced in production, and the parts that require correction work are reduced in the installation correction work, thus stabilizing the welding. Make sure it can be done in place to eliminate problems that are difficult to install and that are expensive to manufacture.
[0013]
In the present invention, as another form of the cab reinforcement structure that solves the above technical problem, it is overlapped on the framework structure that forms the cab in the upper half of the cab provided in the work machine from the outside of the cab. A frame-like reinforcing structure to be attached is provided, and a plurality of pedestal members that are welded at intervals to the skeleton structure are interposed between the reinforced structure and the skeleton structure, and the pedestal member is reinforced. An operator cab reinforcement structure is provided, wherein the structure is attached by bolts.
[0014]
In addition, by interposing a base member, the parts that require dimensional accuracy are reduced in production, and the parts that require correction work are reduced in the mounting and correction work, so that problems that are difficult to install and problems that are expensive to manufacture are eliminated. To. The base member may be attached when a reinforcing structure is required.
[0015]
According to the study by the present inventors, the length to be welded between the reinforcing structure and the frame structure, and the number of pedestal members to intervene are the strength required for the cab reinforcing structure due to differences in operating conditions of the work machine, etc. It may be increased or decreased depending on
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cab reinforcement structure constructed according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a hydraulic excavator that is a typical working machine. An outline of a hydraulic excavator, a frame structure, a reinforcement structure, and the like, which are basically common parts in the first and second embodiments, will be described first.
[0017]
Referring to FIG. 1, a hydraulic excavator generally denoted by reference numeral 2 includes a lower traveling body 4 and an upper revolving body 6 that is pivotably mounted on the lower traveling body 4 and is an upper body frame. A cab 10 having a cab reinforcement structure is attached to the left front portion of the swing frame 8 of the revolving structure 6. The upper swing body 6 includes a front working device 12 that can swing freely in the vertical direction in front of the cab 10, and a rear machine body 14 in which equipment such as an engine is accommodated in the rear of the cab 10. It has been.
[0018]
The cab 10 will be described with reference to FIGS. FIG. 2 shows a state where the reinforcing structure 18 is attached to the skeleton structure 16 in the cab, and FIG. 3 shows a state where they are separated. The detailed illustration of the mounting is omitted (details will be described later). The reinforcing structure 18 is attached to the substantially upper half of the frame structure 16 so as to overlap from the outside.
[0019]
The frame structure 16 is formed in a substantially rectangular parallelepiped shape, and as shown in FIG. 2, the basic form of the cab 10, the roof surface RF, the front side surface FS, the left side surface LS, the right side surface RS, the rear side surface BS, and the floor surface YS. Is formed.
[0020]
The frame structure 16 is basically formed by welding and joining a column of a deformed steel pipe formed of a steel plate. That is, the frame structure 16 includes a left front pillar 16a, a right front pillar 16b, a left rear pillar 16c, and a right rear pillar 16d that are erected at four corners of the floor surface YS, and upper ends of the front pillars 16a and 16b are provided at the upper ends. The horizontal portions 16e and 16f are formed by being bent horizontally toward the rear pillars 16c and 16d, respectively, and the respective ends are joined to the rear pillars 16c and 16d.
[0021]
The upper ends of the front pillars 16a and 16b are connected by a front header 16g, and the upper ends of the rear pillars 16c and 16d are connected by a rear header 16h. A roof panel 16j is provided on the rear header 16h side of the roof surface RF. The left side surface LS is provided with a passenger door 20, and the operator's driver's seat is installed on the floor surface YS below the roof panel 16j.
[0022]
The reinforcing structure 18 is formed by welding and joining steel materials having a rectangular cross section. That is, the left side beam 22 extending along the front side FS side of the front pillars 16a and 16b of the frame structure 16, the roof surface RF side of the horizontal portions 16e and 16f, and the rear side BS side of the rear pillars 16c and 16d, respectively. A right side beam 24 is provided. Between the left side beam 22 and the right side beam 24, a front beam 26 is connected to the front side of the roof surface RF, rear beams 28a and 28b are connected to the rear side, and a center beam 30 is connected to the middle of the front and rear sides. Has been.
[0023]
A first embodiment of a cab reinforcement structure constructed according to the present invention will be described with reference to FIGS. 2 and 3 together with FIG. 4 and mainly FIG. In this embodiment, the reinforcing structure 18a that is basically the same as the above-described reinforcing structure 18 is provided on the side surfaces FS, LS, RS, and BS of the cab of the left side beam 22 and the right side beam 24. A lower part of the part located and a part of the part located on the roof surface RF are attached to the frame structure 16 by welding.
[0024]
That is, as shown in FIG. 4A, the lower part length L1 of each of the front side portions 22a and 24a of the left side beam 22 and the right side beam 24 is set to the front pillar 16a and the front pillar 16b, and the rear side portion 22b, As shown in FIG. 4B, the lower part length L2 of each 24b is superimposed on the rear pillars 16c and 16d, and the front part length L3 of each of the central parts 22c and 24c is superimposed on the horizontal parts 16e and 16f. Both sides are welded.
[0025]
The reinforcing structure 18a and the frame structure 16 in this embodiment are conveniently constructed and installed as follows. That is, the portions of the lengths L1, L2, and L3 that are overlapped with each other define the positions thereof with a jig or the like at the time of manufacture, and reduce the variation in dimensions. The inner bend R1 connecting the front side portion 22a (24a), the central portion 22c (24c) and the rear side portion 22b (24b) of the reinforcing structure 18a does not interfere with the outer bend R2 of the frame structure 16. And make it smaller. The lengths L1, L2, and L3 of the reinforcing structure 18a are straightened from the bent R1 even if the frame structure 16 has an arc shape to facilitate manufacture.
[0026]
Next, a second embodiment of a cab reinforcement structure constructed according to the present invention will be described with reference to FIGS. 2 and 3 together with FIG. 5 and mainly FIG. In this embodiment, a skeleton is provided between the left side beam 22 and the right side beam 24 of the reinforcement structure 18b, which is basically the same as the above-described reinforcement structure 18, and the frame structure 16 on which the beam is overlapped. A plurality of base members bosses 32 are welded to the structure 16 at intervals, and a reinforcing structure 18b is attached to each of the bosses 32 by bolts 34.
[0027]
That is, as shown in FIG. 5 (a), the left front pillar 16a and the right front pillar 16b of the frame structure 16 and the left side beam 22 and the front side portions 22a and 24a of the right side beam 24 of the reinforcing structure 18b, respectively. Further, a pair of bosses 32 are provided at intervals in the direction in which the left side beam 22 and the right side beam 24 extend, and each of the horizontal portions 16e, the horizontal portion 16f and the central portions 22c, 24c of the left side beam 22 and the right side beam 24, respectively. A pair of bosses 32 are provided at an interval in the extending direction of the left side beam 22 and the right side beam 24, and the left rear pillar 16c, the right rear pillar 16d, and the left side beam 22 and the right side beam 24 of the reinforcing structure 18b are disposed behind. Between the side portions 22b and 24b, the left side beam 22 and the right side beam 24 extend in the extending direction. Boss 32 is a pair, are disposed respectively at a.
[0028]
As shown in FIG. 5B, the boss 32 is formed in a columnar shape and is provided with a female screw 32 a, and one end is welded to the frame structure 16 and attached. A through hole 35 for inserting the bolt 34 is formed in the portion of the reinforcing structure 18 b corresponding to the boss 32.
[0029]
The reinforcement structure 18b and the frame structure 16 in this embodiment are conveniently constructed and installed as follows. In other words, the front side portion 22a (24a), the central portion 22c (24c), and the rear side portion 22b (24b) of the reinforcing structure 18a are manufactured in a straight line without conforming to the arcuate shape of the frame structure 18b. To make it easier. The positions of the plurality of through holes 35 formed in the reinforcing structure 18b are defined by a jig or the like at the time of manufacture to reduce the variation in dimensions. At the time of attachment, the boss 32 is temporarily fixed to the reinforcing structure 18 b by the bolt 34, and the reinforcing structure 18 b in this state is overlapped on the frame structure 16 and the boss 32 is welded to the frame structure 16. At this time, when a gap is generated between the reinforcing structure 18b and the boss 32 due to a manufacturing error or the like, a gap adjusting member 36 such as a shim or a washer is appropriately sandwiched in this portion.
[0030]
The operation of the cab reinforcement structure as described above will be described.
[0031]
(1) Installation and production costs:
In the cab reinforcement structure (FIG. 4) of the first embodiment, the position where the skeleton structure 16 and the reinforcement structure 18a of the cab are welded is limited, and the portion that requires dimensional accuracy is reduced in production. In addition, since welding can be surely performed at a stable position, the mounting becomes easy and the manufacturing cost is reduced.
[0032]
In the cab reinforcement structure (FIG. 5) according to the second embodiment, the boss 32 of the base member is interposed between the frame structure 16 and the reinforcement structure 18b, and a part requiring dimensional accuracy is produced in the production. Since the pedestal member only needs to be attached when it is reduced and the reinforcing structure 18b is required, the attachment becomes easy and the manufacturing cost is reduced.
[0033]
(2) Reinforcement structure:
Since the attachment position of the frame structure 16 and the reinforcement structure 18 by welding or a pedestal member is stabilized, the strength can be secured stably and the function of the reinforcement structure can be fully exhibited.
[0034]
(3) Weld length, base member:
The welding lengths L1, L2, and L3 in the first embodiment (FIG. 4) and the number of base members in the second embodiment (FIG. 5) depend on the strength required for the cab reinforcement structure. It can be increased when the strength is increased and decreased when the strength is decreased.
[0035]
Although the present invention has been described in detail based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications or corrections can be made within the scope of the present invention. For example, although the cab in the embodiment of the present invention is formed in a substantially rectangular parallelepiped, the cab may have other shapes such as a spherical surface. What is necessary is just to attach a reinforcement structure according to the shape.
[0036]
【The invention's effect】
According to the cab reinforcement structure configured according to the present invention, in the cab reinforcement structure including the frame-like reinforcement structure that is attached to the upper half of the cab of the work machine from the outside of the cab, the reinforcement structure Can be easily installed, and the manufacturing cost of the reinforcing structure and the cab can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a hydraulic excavator, which is a typical example of a work machine provided with a cab reinforcement structure constructed according to the present invention, as viewed from the left front.
FIG. 2 is an enlarged perspective view of a state in which a reinforcing structure is attached to the framework structure of the cab shown in FIG. 1 as viewed from the upper left front side of the cab.
FIG. 3 is a perspective view showing the reinforcing structure and the frame structure shown in FIG. 2 separately.
FIG. 4 is a diagram showing a first embodiment of a cab reinforcement structure of the present invention.
(A) is the figure which looked at the side of the cab in the direction of arrow A in FIG.
(B) is the expanded sectional view seen in the BB arrow direction of Fig.4 (a).
FIG. 5 is a view showing a second embodiment of the cab reinforcement structure of the present invention.
(A) is the figure which looked at the side of the cab in the direction of arrow A in FIG.
(B) is the expanded sectional view seen in CC arrow direction of Fig.5 (a).
[Explanation of symbols]
2: Excavator (work machine)
10: cab 16: frame structure 18: reinforcement structure 18a: reinforcement structure 18b: reinforcement structure 32: boss (base member)
34: Bolt RF: Roof surface FS, LS, RS, BS: Side

Claims (2)

A frame-shaped reinforcing structure that is attached to the framework structure that forms the cab in the upper half of the cab provided in the work machine and that is attached from the outside of the cab;
The cab reinforcing structure is attached to the framework structure by welding a lower portion of a portion located on the side surface of the cab and a part of a portion located on the roof surface. . A frame-shaped reinforcing structure that is attached to the framework structure that forms the cab in the upper half of the cab provided in the work machine and that is attached from the outside of the cab;
A plurality of pedestal members that are welded at intervals to the framework structure are interposed between the reinforcement structure and the framework structure, and the reinforcement structure is attached to the pedestal member with bolts. The cab reinforcement structure.

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