JP4295003B2 - Cab protection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a driver's cab protection structure, and more particularly to a driver's cab protection structure that protects an operator in a room by restricting deformation and crushing of the driver's cab when a work machine falls.
[0002]
[Prior art]
A working machine including a cab provided on a side edge side of an airframe frame having a traveling body, and a work device provided in the airframe frame so as to project forward of the cab, for example, a hydraulic excavator as a typical example thereof is a traveling machine. A cab guard formed so as 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 or during work Adopted. A typical example of the cab guard includes a pair of inverted U-shaped frames provided on the left and right sides of the cab, and a plurality of connecting beams that connect the pair of left and right frames (for example, Patent Documents). 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 is robust, the cost is high.
[0006]
(2) Installation space:
Since the cab protection structure is formed so as to cover the entire cab separately from the cab, it is difficult in terms of layout to be provided in a limited space of the work machine. When the total height is limited in transportation and operation of the work machine, it is necessary to make the cab smaller or to remove the cab protection structure during transportation.
[0007]
(3) Operator view:
Since the cab protection structure is formed so as to cover the periphery of the cab, the view around the cab from the operator in the room, which is important in 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 to provide a cab protection structure for a work machine that can reduce costs, has no problem in installation space, and does not obstruct the operator's view. It is.
[0009]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a work machine including a cab provided on a side edge side of an airframe frame having a traveling body, and a work device provided on the airframe frame so as to project forward from the cab. A cab protection structure,
Located in the side of the fuselage frame at the rear of the cab, adjacent to the rear of the cab , with the upper end down from approximately half the height of the cab and inside the rear fuselage provided behind the cab Provided with a reinforcing structure that is integrally welded to the fuselage frame,
The geometric protection plane formed by the reinforcing structure, the traveling body, and the work device restricts deformation of the cab when the work machine falls, and secures an operator's space in the cab. The cab protection structure is characterized by the above.
[0010]
The reinforcement structure, the work device, and the traveling body form a geometric protection plane corresponding to, for example, the ground at the time of the fall, and the deformation of the cab so as to restrict the ground from entering the cab. Limit crushing and protect indoor operators. Accordingly, a cab protection structure is provided that is low in cost, eliminates the problem of installation space, and does not obstruct the operator's view by installing a simple reinforcing structure.
[0012]
And a reinforcement structure is provided low adjacent to the rear surface of the cab so as not to obstruct the rear view from the operator in the cab. Further, by installing the reinforcing structure in the rear body, the rear view of the work machine is improved and the appearance of the work machine is not affected. Furthermore, it can be utilized as a member for supporting the rear aircraft.
[0013]
The invention described in claim 2 is the cab protection structure according to claim 1, wherein the reinforcing structure is erected in a rod shape.
[0014]
The reinforcing structure is a simple rod-like structure that is easy to manufacture, inexpensive, and does not require a large space.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a cab protection structure for a work machine configured 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 work machine.
[0025]
Referring to FIGS. 1 and 2, a hydraulic excavator generally indicated by reference numeral 2 is a left side edge side (front side in FIG. 1, FIG. And a front working device 10 as a working device provided on the fuselage frame 6 so as to project forward of the cab 8 (leftward in FIGS. 1 and 2). Yes. At a position adjacent to the rear surface 8 a of the cab 8, a pole 12 as a reinforcing structure constituting the cab protection structure is erected on the body frame 6.
[0026]
The cab 8 is a well-known one, and mainly forms steel plates to form pillars, panels, doors, etc., and assembles them by welding, etc., and inserts window sashes, glass, etc. into the openings of the panels, doors, etc. It is a thing. Therefore, the cab 8 in which a basic framework is formed of steel members has a predetermined rigidity against collision, deformation due to falling objects, and collapse. A door 8b for getting on and off is arranged on the left side surface of the cab 8, and a cab (not shown) on which an operator is seated is provided in the cab 8.
[0027]
A rear airframe 14 in which equipment such as an engine is accommodated is provided on the airframe frame 6 behind the cab 8 (to the right in FIGS. 1 and 2). The rear body 14 is provided with a plurality of doors that can be opened and closed, which are used for maintenance of equipment, and a door 14 a is attached near the pole 12.
[0028]
The front work device 10 includes a boom 10a attached to the body frame 6 so as to be swingable in the vertical direction, an arm 10b attached to the tip of the boom 10a so as to be swingable in the vertical direction, and swingable to the tip of the arm 10b. The bucket 10c is attached to. The front working device 10 is operated by an operator in the cab 8.
[0029]
The pole 12 will be described with reference to FIG. 3 together with FIGS. The pole 12 is located on the side edge side of the fuselage frame 6 adjacent to the rear surface 8a of the cab 8, and is located below the lower edge of the rear window 8c, which is approximately half the height of the cab 8. The frame 6 is erected vertically extending in a bar shape.
[0030]
The main body 12a of the pole 12 is formed of a square steel pipe. The lower end portion of the main body 12 a is reinforced by a triangular reinforcing rib 12 b and is integrally welded onto the block 6 a of the machine body frame 6. The upper end portion of the main body 12 a is bent in an arc shape inward of the body frame 6 in accordance with the outline shape of the rear body 14. The size of the pole 12, such as the height of the pole, the thickness of the steel pipe, and the thickness of the pole 12 is determined so as to have a necessary strength against the falling state of the work machine described later.
[0031]
As shown in FIGS. 1 and 2, the pole 12 is provided in the rear body 14 and is also used as a support member for supporting the rear body 14 and an attachment member for the opening / closing cover 14 a on the side of the rear body 14. Yes.
[0032]
As shown in FIGS. 1 and 2, the pole 12 that is a reinforcing structure installed as described above has an upper end portion thereof, a front end portion of the crawler 4, and a front working device 10 in the present embodiment. A triangular geometric protection plane S is formed by the boom 10a and the mounting portion of the arm 10b. And when the airframe falls down, the geometric protective plane S abuts against the ground G, so that the ground G is prevented from entering the main part of the cab 8 and deformation and collapse of the cab 8 are restricted. An operator's space is secured in the cab 8. Therefore, the pole 12 which is a reinforcing structure is installed at a position and height where the geometric protection plane S is formed, and supports the geometrical protection by sharing the weight of the machine body with the crawler 4 and the front work device 10. Strength is given so as to secure the plane S.
[0033]
In the structure in which the pole 12 as the reinforcing structure is cantilevered on the body frame 6 shown in FIG. 3, when the weight of the body cannot be supported by the size of the body, the reinforcing structure as shown in FIG. As an object, if a pole-shaped gate 16 in which two legs are welded to the fuselage frame 6 in the form of an inverted U shape in which the pole 12 is supported from the inside of the fuselage, the strength is improved with a simple structure. be able to.
[0038]
The effect of the cab protection structure as described above will be described.
[0039]
(1) Operator protection:
According to the cab protection structure of the present invention, a pole 1 2 provided firmly to the body frame 6 as a reinforcing structure, the crawler 4, by the front working mechanism 10, the geometric protection of rigid triangular By forming the plane S (FIGS. 1 and 2) , it is possible to restrict deformation and crushing of the cab 8 at the time of falling, so that an operator's space can be secured in the cab 8 and the operator can be protected.
[0040]
(2) Cost:
Pole 1 2 as a reinforcing structure, as compared with the conventional cab cab covers the entire guard, much smaller, easily formed by a square tube, and the structure is simple. Therefore, the cost can be greatly reduced.
[0041]
(3) Installation space:
The pole 12 as a reinforcing structure is small, and can be installed in the rear body 14 behind the cab 8 and by replacing the conventional rear body 14 with a member that supports the door 14a. Do not need . Therefore, it is easy to layout. Further, since the pole 12 as the reinforcing structure is provided below the upper end of the roof of the cab 8, the cab is made smaller when the total height is limited in the transportation or operation of the conventional work machine. There is no need to form or remove the cab protection structure.
[0042]
(4) Operator view:
Since pole 12 as a reinforcing structure is found provided at substantially half or less of the cab height immediately after the driver's cab 8, the operator's view of the cab 8 is ensured.
[0044]
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 are possible within the scope of the present invention, for example, as follows. It is something that can be done.
[0046]
Form of reinforcement structures:
In the embodiment of the present invention, the reinforcing structure is formed in the shape of a rod or a two-legged gate, but depending on the form of the work machine, the form of the body frame, etc., for example, a trapezoidal block shape It can be made into an appropriate shape.
[0047]
(3) Counterweight:
In the embodiment of the present invention, the tailgate 18 as the reinforcing structure is installed on the counterweight 20, but may be directly attached to the body frame 6.
[Brief description of the drawings]
Schematic side view of a hydraulic excavator is a work machine provided with a configured cab protection structure according to the present invention; FIG.
FIG. 2 is a plan view of the hydraulic excavator shown in FIG.
FIG. 3 is an enlarged perspective view showing a portion of the reinforcing structure shown in FIGS. 1 and 2 with the covers of the rear body removed.
Figure 4 is an enlarged perspective view showing another form of the reinforcing structure of FIG.
[Explanation of symbols]
2: Excavator (work machine)
4: Crawler (running body)
6: Airframe frame 8: Driver's cab 8a: Rear surface 10: Front work device 12: Pole (reinforcement structure)
14: Rear airframe 16: Gate (reinforcing structure )
S : Geometrical protection plane G: Ground

Claims (2)

A cab protection structure for a work machine comprising a cab provided on a side edge side of an airframe frame having a traveling body, and a work device that projects to the front of the cab and is provided on the airframe frame,
Located in the side of the fuselage frame at the rear of the cab, adjacent to the rear of the cab , with the upper end down from approximately half the height of the cab and inside the rear fuselage provided behind the cab Provided with a reinforcing structure that is integrally welded to the fuselage frame,
The geometric protection plane formed by the reinforcing structure, the traveling body, and the work device restricts deformation of the cab when the work machine falls, and secures an operator's space in the cab. A cab protection structure characterized by that. Reinforcing structure is erected into a rod, cab protection structure of claim 1, wherein.

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