JP5604750B2 - Work machine cab protection structure - Google Patents

Description

  The present invention relates to a cab protection structure for a work machine that protects the cab from a load (lateral load) applied to an upper part of the cab from the side outside the machine body.

  In a hydraulic excavator 1 which is a typical work machine as shown in FIG. 4, the cab 10 is prepared for a situation in which a load F is directly applied to the upper part of the cab 10 from the side outside the machine body as indicated by arrows in the drawing. Various cab protection structures have been developed to reinforce the structure. 4, reference numeral 2 indicates a lower traveling body, reference numeral 3 indicates an upper turning body, reference numeral 4 indicates a working device having a boom 4a, an arm 4b, and a bucket (working tool) 4c, and reference numeral 5 indicates a chassis. A frame is shown.

For example, Patent Literature 1 discloses a technique for preventing a cab from being deformed by an excessive external force applied to the cab by installing protection means for supporting the upper portion of the cab from the side outside the cab.
Specifically, the protection means disclosed in Patent Document 1 includes a main protection member and a sub-protection member formed of a square steel pipe or a round steel pipe. The main protection member is erected on one main frame of a pair of main frames arranged side by side in the longitudinal direction of the fuselage at the bottom of the revolving structure, and is formed at substantially the same height as the roof of the cab. One or a plurality of sub protection members are provided, and at least one sub protection member is provided obliquely between the upper portion of the main protection member and the other main frame of the pair of main frames.

JP-A-2005-350948

  According to the technique described in the cited document 1, since the main protection member is erected so as to extend from the main frame to the roof to support the roof of the cab, there is a problem that the structure becomes excessive. Also, various devices are installed on the main frame, and if a sub-protection member is provided so as to straddle both main frames, the layout of each device is restricted and the sub-protection member becomes an obstacle during maintenance. There is a problem.

  Further, as shown in FIG. 5, the cab 10 is generally formed such that the front pillars 11L and 11R are narrower than the rear pillars 12L and 12R in order to ensure a good front view. Therefore, since the strength of the front side of the cab 10 is lower than that of the rear side, it is desired to increase the strength of the front side of the cab 10. However, according to the protection means described in Patent Document 1, since the installation location is limited to a position that avoids the movable range of the work device 4, there is a problem that only the rear end of the cab 10 can be reinforced. In addition, the code | symbol 13 in FIG. 5 has shown the center pillar for attaching a door.

  The present invention has been devised in view of such problems, and the cab can be protected with a simple configuration against a load applied to a portion on the upper side of the center of gravity of the cab from the side outside the fuselage. An object of the present invention is to provide a cab protection structure for a work machine.

To achieve the above object, a cab protection structure for a work machine according to the present invention is a cab protection structure for a work machine comprising a work device and a cab disposed on a side of the work device, wherein the cab is the cab protection structure. A plate-shaped reinforcing plate is attached to a contact position where the work device side column of the cab comes into contact with the work device when the load falls toward the work device side, and the column, What struts der of the working device side among the pair of left and right strut disposed in front of the cab, the reinforcing plate is mounted so as not to inhibit the view from the inside the cab on the surface of said post, The contact position is in the vicinity of a position where the support column and the upper surface of the working device overlap in a side view when the cab is viewed from the working device side in a state where the working device is in the maximum reach posture. It is constant, the mounting position of the reinforcing plate is characterized to be limited to the contact position. Here, it is assumed that the load is received at a portion above the position of the center of gravity of the cab.

According to the cab protection structure for a working machine of the present invention, the position of the center of gravity of the cab from the side outside the machine body to the working device side with a simple configuration in which a plate-like reinforcing plate is attached to the column on the working device side of the cab. It is possible to reinforce the support column that is easily deformed by receiving a load applied to the upper portion, and as a result, it is possible to protect the cab from such a load.
In addition, since the mounting position of the reinforcing plate is limited to the contact position where the support column contacts the working device when the cab falls to the working device side, the size of the reinforcing plate is minimized and the structure is simpler. Can be. Further, since the reinforcing plate is mounted on the support column, there is an advantage that the view of the operator is not obstructed.

It is a typical side view showing the cab protection structure of the working machine concerning one embodiment of the present invention. It is a typical perspective view showing the cab protection structure of the working machine concerning one embodiment of the present invention. It is a typical perspective view for demonstrating the attachment position of the reinforcement plate of the cab protection structure of the working machine which concerns on one Embodiment of this invention. It is a perspective view which shows a typical hydraulic excavator typically. It is a schematic diagram for demonstrating the relationship between the support | pillar of a cab of a general hydraulic shovel, and a visual field range.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a cab protection structure for a work machine according to the present invention will be described with reference to the drawings. The drawings will be described while diverting the drawings used for explaining the prior art.
<Configuration>
The cab protection structure for a working machine according to the present embodiment is suitably applied to the cab 10 of the excavator 1 as shown in FIG.

The hydraulic excavator 1 is installed so as to extend forward from a lower traveling body 2, an upper revolving body 3 that is pivotably coupled to the lower traveling body 2, and a front center of the upper revolving body 3. And a work device 4 for performing work. The work device 4 includes a boom 4a, an arm 4b, and a work tool 4c such as a bucket.
The upper swing body 3 has a chassis frame 5 as a gantry, and the chassis frame 5 has a pair of left and right main frames 5a (see FIG. 3) that are located in the center of the body width direction and extend in the longitudinal direction of the body. doing.

As shown in FIG. 3, a boom foot portion 5b that supports the base end portion of the boom 4a is provided at the front portion of each main frame 5a. A cab 10 as an operator room is placed on the left side of the front portion of the chassis frame 5 so as to be adjacent to the boom 4a supported by the boom foot portion 5b. That is, the cab 10 is installed on the side of the working device 4.
As shown in FIG. 5, the cab 10 includes a pair of left and right front pillars (front columns) 11L and 11R that are installed on the front surface of the cab and a pair of left and right rear pillars that are installed on the rear surface of the cab. (Rear struts) 12L and 12R and a center pillar (door mounting strut) 13 installed between the left front pillar 11L and the left rear pillar 12L.

  Further, as shown in FIG. 3, the cab 10 includes a front roof member 14 that connects the upper ends of the pair of left and right front pillars 11L and 11R, and a rear roof member 15 that connects the upper ends of the pair of left and right rear pillars 12L and 12R. A left roof member 16 that connects the upper ends of the left front pillar 11L, the left rear pillar 12L, and the center pillar 13, and a right roof member 17 that connects the upper ends of the right front pillar 11R and the right rear pillar 12R. Yes. In FIG. 3, the cab 10 is drawn with a ceiling window installed on the ceiling surface removed.

Each pillar 11L, 11R, 12L, 12R, 13 and each member 14, 15, 16, 17 is a structure formed hollow by a steel plate, and its cross-sectional shape is required strength, window glass attachment, etc. Is set arbitrarily in consideration of.
The left front pillar 11L and the left roof member 16 may be integrally formed as shown in FIG. 3 (that is, for example, a single steel pipe may be curved at a corner). Or alternatively, they may be formed separately and joined at the corners with joints. Similarly, the light front pillar 11R and the light roof member 17 may be formed integrally, or may be formed separately and joined by joints at the corners.

As shown in FIGS. 1 and 2, in this embodiment, the predetermined position Y of the light front pillar 11 </ b> R is reinforced by the reinforcing plate 20. The reinforcing plate 20 is a rectangular plate-like member made of sheet metal, and is attached to the outer surface of the cab of the light front pillar 11R by fixing means such as welding or bolts or rivets.
As shown in FIG. 3, the predetermined position Y is a portion above the center of gravity of the cab 10 (hereinafter also simply referred to as an upper portion. Here, near the left roof member 16 of the cab 10, that is, near the roof outside the aircraft body. When a load F (hereinafter also referred to as a lateral load) F is applied from the lateral side of the fuselage toward the boom 4a side, and the cab 10 falls to the boom 4a side (the fuselage inner side), the light front This is the contact position Y where the pillar 11R may come into contact with the boom 4a.

Specifically, the contact position Y is a position where the light front pillar 11R and the upper surface of the boom 4a overlap in a side view when the excavator 1 is viewed from the right side during normal operation, that is, in a side view before the cab 10 is deformed. (Intersection position) The vicinity of X can be set as the contact position.
According to the knowledge of the present inventors, when the cab 10 receives an excessive lateral load F and falls to the boom 4 a side, the deformation behavior of the cab 10 changes depending on the front-rear position of the load point and the front-rear strength balance of the cab 10. Therefore, the contact position with the boom 4a also changes. The light front pillar 11R is not necessarily deformed to the side, but rather falls slightly rearward and comes into contact with the lower position of the boom 4a. The contact position Y is set as a contact position in a range in which contact is possible in consideration of such a change in the deformation behavior of the cab 10.

The reinforcing plate 20 is attached so as to reinforce a predetermined range in the vicinity of the intersecting position including the position slightly lower than the intersecting position as the contact position Y, and corresponds to a change in the deformation behavior of the cab 10, It is possible to cover a position where there is a possibility of contact.
The contact position Y is preferably set to be limited to the contact position Y in a state where the boom 4a is in the maximum reach posture. At this time, the length of the reinforcing plate 20 in the vertical direction is set to an appropriate length with the contact position Y as the center.

  Moreover, you may set the length of the up-down direction of the reinforcement plate 20 to the length according to the up-and-down swing range of the boom 4a. That is, the contact position Y in the state where the boom 4a is in the maximum reach posture may be set to a length extending to an appropriate upper position with the lower end portion.

<Action and effect>
Since the cab protection structure for a working machine according to an embodiment of the present invention is configured as described above, the following operations and effects are achieved.
As shown in FIG. 3, when an excessive lateral load F acts on the upper part of the cab 10 toward the inside of the machine body, the cab 10 falls to the boom 4a side in response to the lateral load F, and the light front pillar 11R Contact 4a. When the light front pillar 11R comes into contact with the corner P of the boom 4a having an angular cross section, an excessive load is locally applied to the light front pillar 11R at the corner P, that is, at the contact position Y. When an excessive load is applied to the light front pillar 11R, the light front pillar 11R may be deformed so as to buckle at the contact position Y.

In this embodiment, since the reinforcing plate 20 is attached to the position Y where the light front pillar 11R may contact the boom 4a, the reinforcing plate 20 can receive a load and distribute and reduce the load. Thus, when the cab 10 receives the lateral load F, it is possible to protect the cab 10 by suppressing the cab 10 from being locally deformed.
Further, if the reinforcing plate 20 is installed at the contact position Y in the state where the boom 4a is in the maximum reach posture, the cab 10 can be effectively protected in a state where the posture of the fuselage is the most unstable. .

  Further, since the reinforcing plate 20 is simply attached to the light front pillar 11R, the cab 10 can be protected with a simple configuration. Further, the mounting position of the reinforcing plate 20 is limited to the contact position Y where the light front pillar 11R contacts the boom 4a when the cab 10 falls to the boom 4a side, so that the size of the reinforcing plate 20 is minimized. It can suppress and can be made a simpler structure.

  Further, since the reinforcing plate 20 is attached on the surface of the light front pillar 11R, there is an advantage that the view of the operator is not obstructed. Furthermore, there is an advantage that the strength of the light front pillar 11R can be increased while the light front pillar 11R is formed thin in order to ensure the front view.

[Others]
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, the reinforcing plate 20 is formed in a rectangular plate shape, but may be formed in other shapes, for example, an elliptical plate shape.

  In addition, the cab protection structure for the work machine according to the above embodiment is not limited to being applied to the cab 10 of the excavator 1. Can be suitably used in a cab such as a work machine, for example, a crane in which a scene in which an excessive load is applied toward the work device and is in contact with the work device is assumed. At this time, the support column to which the reinforcement plate is attached is set according to the type of work machine, and it is of course possible to attach the reinforcement plate to a support column other than the light front pillar 11R.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper revolving body 4 Working device 4a Boom 4b Arm 4c Bucket 5 Chassis frame 5a Main frame 10 Cab 11L Left front pillar 11R Right front pillar (post)
12L Left rear pillar 12R Right rear pillar 13 Center pillar 14 Front roof member 15 Rear roof member 16 Left roof member 17 Right roof member 20 Reinforcement plate F Load P Boom corner Y Contact position

Claims (1)

A cab protection structure for a work machine comprising a work device and a cab arranged on a side of the work device,
When the cab falls upon receiving a load toward the working device, a plate-shaped reinforcing plate is attached to a contact position where the working device-side column of the cab contacts the working device,
The strut I strut der of the working device side among the pair of left and right strut disposed in front of the cab, the reinforcing plate, so as not to inhibit the view from the inside the cab on the surface of said strut Attached to the
The contact position is set in the vicinity of a position where the support column and the upper surface of the work device overlap in a side view when the cab is viewed from the work device side in a state where the work device is in the maximum reach posture .
The cab protection structure for a work machine , wherein a mounting position of the reinforcing plate is limited to the contact position .

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