JP4156973B2 - Cab interior reinforcement structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cab reinforcement structure, and more particularly, to a cab reinforcement structure that protects an operator in the room by suppressing deformation and collapse of the cab when an external force is applied to the cab due to a fall of a work machine or the like. .
[0002]
[Prior art]
A working machine, for example, a hydraulic excavator as a typical example thereof, includes a driver's cab at the left front part on the body frame. This hydraulic excavator is designed to cover the entire cab as a cab protection structure to protect the operator in the room against deformation and collapse of the cab when the aircraft falls due to some accident during traveling or work. The formed cab guard is adopted. A typical example of the cab guard includes a pair of inverted U-shaped frames standing on the left and right sides of the cab from the body frame, and a plurality of connecting beams that connect the pair of frames (for example, , See Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-173017 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, the conventional cab protection structure in the form as described above has the following problems to be solved.
[0005]
(1) Cost:
Since the cab protection structure is formed so as to cover the entire cab separately from the cab and must be robust, the cost is high. The cost of the work machine is also increased.
[0006]
(2) Installation space:
Since the cab protection structure is erected on the fuselage frame separately from the cab, it is difficult in terms of layout to be installed in a limited space of the work machine, such as forming a support portion on the fuselage frame.
[0007]
(3) Operator view:
Since the driver's cab protection structure is formed so as to cover the periphery of the driver's cab, visibility of the operator's cab surroundings from the operator in the room, which is important for traveling and working of the work machine, is hindered.
[0008]
The present invention has been made in view of the above-mentioned facts, and its technical problem is that the cost can be reduced, there is no problem in the installation space, and the operator's field of view is secured and the operator is protected without obstructing the operator's view. It is to provide a cab reinforcement structure that can be done.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention , a beam, which is integrally attached from the outside of the operator's cab on the upper half of the operator's cab provided in the work machine, is superimposed on the framework structure forming the operator's cab. A cab reinforcement structure characterized by comprising reinforcement structures that are welded together and formed into an integral frame shape .
[0010]
The cab reinforcement structure is attached to the framework structure of the cab in the upper half of the cab from the outside of the cab, and the deformation and collapse of the cab in the event that the fuselage falls, etc. Therefore, it is possible to provide a cab reinforcement structure that protects an operator in the room, is inexpensive, has no problem in installation space, and does not obstruct the operator's view.
[0012]
Then, by forming the reinforcing structure into an integral frame shape, the strength of the reinforcing structure is ensured, and handling at the time of manufacturing and mounting is facilitated.
[0013]
The invention described in claim 2, in cab reinforcement structure according to claim 1 Symbol placement, the cab is formed in a substantially rectangular parallelepiped, reinforcing structures, at least, the front face of the cab, the ceiling surface and a rear surface A pair of left and right side beams extending along the frame structure between the left side surface and the right side surface, and a front beam extending along the frame structure between the front surface and the ceiling surface and connected to the pair of side beams And a rear beam extending along the upper and lower edges of the rear window formed on the rear surface and connected to the pair of side beams.
[0014]
And the substantially rectangular parallelepiped cab which is a typical cab is effectively reinforced.
[0015]
Invention described in claim 3 is the cab reinforcement structure according to claim 2 Symbol mounting, a pair of right and left side sills of the reinforcing structures, superposed both sides integrally welded to framework structure of the cab Is installed .
[0016]
Then, the reinforcing structure is welded and attached to the frame structure, so that it is securely fixed and reliably reinforced.
[0017]
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.
[0018]
The hydraulic excavator will be described with reference to FIG. A hydraulic excavator generally indicated by numeral 2 includes a lower traveling body 4 and an upper revolving body 6 that is pivotably mounted on the lower traveling body 4. The swing frame 8 of the upper revolving body 6, which is a body frame, includes: A substantially rectangular parallelepiped operator's cab 10 on the left front, a front working device 12 projecting forward of the operator's cab 10 and freely swinging in the vertical direction, and equipment such as an engine behind the operator's cab 10 A rear airframe 14 is provided.
[0019]
2 to 4 in which the cab 10 is shown by its framework structure, the cab 10 has a half guard 18 as a reinforcing structure superimposed on the substantially upper half of the framework structure 16 from the outside. Installed. 2 and 3 show a state where the half guard 18 is attached, and FIG. 4 shows a state where the half guard 18 is separated. 2 and 4 are perspective views of the cab 10 as viewed from the upper left front, and FIG. 3 is a perspective view of the cab 10 as viewed from the upper left rear.
[0020]
The skeleton structure 16 of the cab 10 does not constitute a novel feature of the present invention, and the structure itself may be known. Therefore, an outline of the configuration will be described, and a detailed description thereof will be omitted. In the cab 10, the substantially rectangular parallelepiped frame structure 16 forms a front surface, a left side surface, a right side surface, a rear surface, a floor surface as a lower surface, and a ceiling surface as an upper surface, which are basic forms of the cab 10. ing. It should be noted that this “front, back, left, right, up, down” relationship is shown by arrows in FIG.
[0021]
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 provided upright at four corners of a rectangular floor surface. These pillars are basically formed by so-called irregular steel pipes in which a steel plate is formed into a tubular shape. The upper ends of the front pillars 16a and 16b are bent horizontally toward the rear pillars 16c and 16d, respectively, and the ends of the horizontal portions 16e and 16f are in contact with and joined to the rear pillars 16c and 16d, respectively. The upper ends of the left and right front pillars 16a and 16b are integrally connected by a front header 16g provided therebetween. The upper ends of the left and right rear pillars 16c and 16d are integrally connected by a rear header 16h provided therebetween. A roof panel 16j is integrally joined to each of the rear header 16h and the horizontal portions 16e and 16f at a portion corresponding to the head of the operator in the cab on the rear header 16h side of the ceiling surface. A rear panel 16k is integrally provided on the rear surface between the left and right rear pillars 16c and 16d, and a substantially rectangular rear window 20 is formed by opening substantially the upper half thereof.
[0022]
The front opening of the frame structure 16 is provided with a front window, the opening on the front side of the ceiling surface is provided with a skylight, and the opening on the right side is provided with a right window. A passenger door 22 is provided on the left side. The operator's driver's seat is disposed on the floor surface below the roof panel 16j with the rear window 20 as the back.
[0023]
The half guard 18 is attached to the substantially upper half of the frame structure 16 of the cab 10 so as to overlap from the outside of the cab 10 (state of FIGS. 2 and 4). The half guard 18 will be described with reference to FIGS. 2 to 4 and FIG. 5, mainly FIGS. 4 and 5. The half guard 18 is composed of a pair of left and right side beams 18a and 18b which are a pair of left and right side beams, and a front beam 18c which is a front beam which connects the side beams 18a and 18b on the front side, and a central beam which is connected between the front and rear. A center beam 18d and rear beams 18e and 18f which are rear beams connected on the rear side.
[0024]
The left side beam 18a and the right side beam 18b are the front side of the left and right front pillars 16a and 16b, the upper side of the horizontal portions 16e and 16f, and the rear side of the left and right rear pillars 16c and 16d, respectively. The outer edges of each of the first and second outer edges extend along each of the outer edges, and are formed in a substantially inverted U shape as a whole. The front beam 18 c extends along the front header 16 g of the frame structure 16 and is connected to the left side beam 18 a and the right side beam 18 b. The center beam 18d extends along the front edge of the roof panel 16j of the frame structure 16 and is connected to the left side beam 18a and the right side beam 18b. The rear beams 18e and 18f extend along the upper edge and the lower edge of the rear window 20, and are connected to the left side beam 18a and the right side beam 18b, respectively.
[0025]
These beams are formed of a steel material having a rectangular cross section as shown in FIG. 5 and welded to each other to form an integral frame-shaped half guard 18 as shown in FIG. The material of the beam of the half guard 18 is adjusted to the rectangular cross-section steel shown in FIG. 5 and the outline of the frame structure 16 shown in FIG. 6 in consideration of necessary strength, appearance, material availability, and the like. An appropriate material such as a modified steel pipe or a square steel pipe can be selected.
[0026]
The half guard 18 configured as described above is attached by welding the left side beam 18a and the right side beam 18b, which are the main members thereof, to the frame structure 16 by welding on both sides as shown in FIG. .
[0027]
The operation of the cab reinforcement structure in the form as described above will be described.
[0028]
(1) Reinforcement of cab:
A driver's cab provided for the work machine has a large field of view from the operator in the room for work. Therefore, the upper part of the cab is relatively large open, and this large open upper part is a structurally weak part against deformation due to external force. Accordingly, by reinforcing the weak upper portions of the front pillars 16a and 16b, the periphery of the rear window 20, the front header 16g, and the like by the half guard 18, in the event of a fall of the work machine, etc. It is possible to suppress deformation and crushing of the cab. And the operator's space in a room can be secured and an operator can be protected. Further, the cab can be strongly reinforced by integrally fixing the half guard 18 to the skeleton structure of the cab by welding.
[0029]
(2) Cost:
Unlike the conventional cab protection structure that is formed so as to cover the entire cab separately from the cab, the reinforcement structure is attached to the cab itself and the upper half, overlapping from the outside, Cost can be greatly reduced. Further, since the reinforcing structure is formed in an integral frame shape, handling at the time of manufacturing and mounting is easy, and costs for storage and handling can be reduced.
[0030]
(3) Installation space:
The conventional cab protection structure is installed in a limited space on the fuselage frame separately from the cab and the layout for installation is difficult, but the reinforcement structure is attached to the upper half of the cab itself. There is no problem of installation space and layout.
[0031]
(4) Operator view:
Since the reinforcing structure is installed so as to overlap the framework structure of the cab, the view of the operator in the room is not hindered.
[0032]
As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications or corrections may be made within the scope of the present invention, for example, as described below. It is something that can be done.
[0033]
(1) Attaching the reinforcing structure:
In the embodiment of the present invention, as shown in FIGS. 5 and 6, the half guard 18 that is a reinforcing structure is attached to the frame structure 16 by welding, but the required strength and the shape of the cab are required. Alternatively, it may be attached by fastening means such as a bolt 24 as shown in FIGS. In particular, if it can be attached and detached freely using fastening means such as bolts, it can be installed only on the site where a reinforcement structure is required in the work machine used in the field of various work forms, and the work machine manufacturing factory Can be installed at the delivery site after delivery from the factory.
[0034]
7 and 8 are further described. A nut 26 is welded and integrally attached to the side of the frame structure 16, and a through bolt hole 28 is provided in the reinforcing structure 18 made of square steel in FIG. 8 is provided with a pipe-like spacer 30 therein, and bolts 24 are respectively inserted through washers 32 and screwed into nuts 26 to be fixed.
[0035]
(2) Driver's cab:
In the embodiment of the present invention, the cab has a substantially rectangular parallelepiped shape, but may have other shapes such as a spherical surface. The reinforcing structure may be formed in accordance with the frame structure that forms the cab, and may be attached in an overlapping manner from the outside.
[0036]
(3) Connecting beam:
In the embodiment of the present invention, the central beam is provided as a beam connecting the left and right side beams, but at least the front beam and the rear beam may be used if there is no problem in strength.
[0037]
【The invention's effect】
According to the cab reinforcement structure configured according to the present invention, the cost can be reduced, there is no problem in the installation space, and the operator's field of view can be secured and the operator can be protected without disturbing the operator's field of view. A cab reinforcement structure can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view of a hydraulic excavator as a typical example of a work machine having a cab reinforcement structure constructed according to the present invention as viewed from the left front side.
FIG. 2 is an enlarged perspective view showing 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.
3 is a perspective view of the state of FIG. 2 as viewed from the upper left rear side of the cab.
4 is a perspective view showing the frame structure and the reinforcing structure in FIG. 2 separately.
5 is a representative enlarged cross-sectional view showing attachment parts (attached by welding) of the frame structure and the reinforcing structure as seen in the direction of arrows AA in FIG. 2;
6 is a cross-sectional view showing an example in which a modified steel pipe is used instead of the reinforcing structure made of the square steel material of FIG. 5;
FIG. 7 is a cross-sectional view showing an example in which the frame structure and the reinforcing structure in FIG. 5 are attached by bolts instead of the attachment by welding.
8 is a cross-sectional view showing an example in which a modified steel pipe is used in place of the reinforcing structure made of the square steel material of FIG.
[Explanation of symbols]
2: Excavator (work machine)
10: cab 16: frame structure 18: half guard (reinforcement structure)
18a: Left side beam (side beam)
18b: Right side beam (side beam)
18c: Front beam (front beam)
18e: Rear beam (rear beam)
18f: Rear beam (rear beam)
20: Rear window

Claims (3)

The substantially upper half of the cab provided in the work machine, mounted integrally from outside of the cab to overlap the framework structure to form the cab, welded beams together are formed integrally of the frame-shaped A cab reinforcement structure characterized by comprising a reinforcement structure. The cab is formed in a substantially rectangular parallelepiped, and the reinforcing structure is at least a pair of left and right sides extending along a framework structure between at least the front surface, ceiling surface, rear surface, left side surface, and right side surface of the cab. A beam, a front beam extending along the frame structure between the front surface and the ceiling surface and connected to the pair of side beams, and the pair extending along the upper and lower edges of a rear window formed on the rear surface and a rear beam for coupling to the side beams, claim 1 Symbol mounting of the cab reinforcement structure. Reinforcing the right and left pair of side beams of the structure, both sides framework structure of the cab of repeated is mounted is welded integrally, claim 2 Symbol mounting of the cab reinforcement structure.

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