JP2010255245A - Reinforcing material for cab of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To assemble a reinforcing material 14 which can prevent the buckling of beam materials 11 and 13 to perpendicular corners between the rear-side beam material 13 and right and left beam materials 11 which frame and form a cab 5 of a hydraulic excavator 1. <P>SOLUTION: The reinforcing material is constituted by integrating first and second stiffening plates 15 and 16 which abut on the beam materials 11 and 13 via surfaces, and a right-angled triangle-shaped supporting plate 17 which is interposed between the stiffening plates 15 and 16. Extended surfaces 15a and 16a which are extended along a side direction with respect to apexes 17b and 17d of the supporting plate 17 are formed on the stiffening plates 15 and 16, respectively. Thus, a load acting on an apex portion is dispersed and borne in a surface-abutting state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technical field of a reinforcing material for a cab in a construction machine such as a hydraulic excavator or a wheel loader.

  Generally, some construction machines such as hydraulic excavators may be equipped with a cab on the traveling vehicle. For such a cab, it is assumed that the traveling vehicle rolls over or falls when working on a work site with a poor footing to protect the operator. Reinforcement has been attempted. In reinforcing such a cab, when the cab is formed by using a pillar material and a beam material as a frame material, a right-angled corner portion formed between adjacent frame materials is used. A material that is reinforced by incorporating a reinforcing material having a triangular plate shape has been proposed (see, for example, Patent Document 1).

JP 2007-131263 A

  However, since the above-mentioned conventional one is in a line contact state corresponding to the thickness of the reinforcing plate at the apex portion of the reinforcing material that contacts each frame material, a load in the direction of reducing the angle between the frame materials worked. In this case, there is a problem that the frame material is subjected to a load in a state where stress concentrates on the apex portion of the reinforcing material, and the frame material portion of the portion is easily buckled and weakened in strength. There is a problem to be solved by the present invention.

The present invention was created with the object of solving these problems in view of the above circumstances, and the invention of claim 1 was formed by using a pillar material and a beam material as a frame material. In a construction machine equipped with a cab, when reinforcing a cab by incorporating a reinforcing material into a right-angled corner formed between adjacent ones of the frame material, the reinforcing material is applied to each frame material, respectively. A flat first plate and a second flat plate to be contacted with each other and a flat plate support plate having a right triangle shape. One first side of the sides sandwiching the right angle of the support plate is a first contact. It is configured to be integrated with the plate surface of the plate in contact with the other second side in contact with the plate surface of the second contact plate, and the first and second contact plates include the support plate Extending surface portions extending in the direction along the corresponding sides from the vertex positions of the first and second sides A reinforcing member for the cab of a construction machine, characterized in that respectively are provided.
In the invention of claim 2, when at least one of the surfaces on the frame material side where the first and second contact plates are contacted is an inclined surface, the contact plate and the support plate correspond to the inclination of the inclined surface. The reinforcing material for a cab in the construction machine according to claim 1, wherein the reinforcing material is integrated.

When the load of the direction which makes the corner angle between adjacent frame materials work small by setting it as invention of Claim 1, in the frame material which receives this load, rather than the vertex part of a right-angled triangular support plate As a result of the extended surface portion being abutted against the frame material, the extended surface portion is pressed in the abutted state with the apex portion serving as a fulcrum and receives a widely distributed load. As a result, the buckling of the frame material can be prevented and the strength of the cab can be increased.
By making it the invention of claim 2, even if the part which the 1st and 2nd contact plate abuts is an inclined surface, it will be able to be maintained in the abutment state easily and reliably, and the buckling of the frame material will be prevented. It is possible to increase the strength of the cab.

1 is an overall side view of a hydraulic excavator. It is a perspective view which shows the framework state of a cab. It is a fragmentary perspective view which shows a cab reinforcement site | part. (A) is a partial cross section front view which shows a cab reinforcement part, (B) is a partial cross section side view which shows a cab reinforcement part.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 is provided with a crawler-type lower traveling body 2 and an upper revolving body 4 provided with a bucket-type work attachment 3 so as to be rotatable. The upper swing body 4 is provided with a cab 5 to be described later for protecting the driver's seat 5a on one side of the front half, an engine room 6 on the rear half, and a counterweight 7 on the rear end. All of them are the same as before.

  The cab 5 includes a pillar material 9 at the front left and right corners standing from the body frame 8, a pillar material 10 at the rear left and right corners, and left and right beams supported between the upper ends of the pillars 9 and 10. A frame is formed using various members such as the material 11, the front beam material 12, and the rear beam material 13 as frame materials, and necessary members such as a plate material, a window material, and a door are incorporated in each framed space portion. It is the same as before.

  Reference numeral 14 denotes a reinforcing material in which the present invention is implemented. The reinforcing material 14 is assembled to a right-angled corner formed by the rear beam material 13 and the left and right beam materials 11. The beam member 13 is configured by laminating two rectangular cylinders, like the rear left and right column members 10. On the other hand, the left and right beam members 11 employ the same deformed steel pipes as the front left and right column members 9, but on the inner side surface of the cab 5, the inclined surface 11 a is inclined so as to reach the left and right outwards as the lower side. Is formed so that a wide space in the cab 5 can be secured.

  The reinforcing member 14 is fixed to the flat cab inner side surface 13a of the rear beam member 13 and the inclined surface 11a of the left and right beam members 11 in a face-contact manner. 15 and 16 and a support plate 17 having a right triangle shape interposed between the plates 15 and 16. The first abutment plate 15 and the support plate 17 abut one of the first sides 17a of the two sides sandwiching the right angle of the support plate 17 at an intermediate position in the vertical direction of the plate surface of the first abutment plate 15. In this state, the plate surfaces are integrated by welding so that the plate surfaces are perpendicular to each other, but the first backing plate 15 is closer to the first side 17a than the position of the front vertex 17b of the support plate first side 17a. An extending surface portion 15a extending forward is formed.

  On the other hand, the second contact plate 16 and the support plate 17 are in a state in which the other second side 17c sandwiching the right angle of the support plate 17 is abutted against the middle position of the plate surface of the second contact plate 16 in the vertical direction. Although the plate surface of the contact plate 16 is integrated by welding so that the plate surfaces are inclined to the inclined surface 11a, the second contact plate 16 is also integrated with the first contact plate 15. As in the case, an extending surface portion 16a is formed extending inward in the left-right direction along the second side 17c from the left-right inner vertex 17d of the support plate second side 17c.

  In the embodiment for carrying out the present invention configured as described, the reinforcing member 14 is provided between the rear beam member 13 and the left and right beam members 11 constituting the left and right frames and the rear frame of the ceiling surface as described above. The cab 5 is reinforced by assembling to the right-angled corner portion. In this case, when a load in the direction of reducing the angle between the rear beam member 13 and the left and right beam members 11 is applied, the load is reinforced. Although it is received by the support plate 17 of the material 14, the load acts on the rear beam material 13 and the left and right beam materials 11 due to the reaction caused by the support plate 17. 13 and the left and right beam members 11 are widely received by the first and second contact plates 15 and 16, respectively.

  In this case, the first and second contact plates 15 and 16 are formed with the extended surface portions 15a and 16a extending from the positions of the apexes 17b and 17d of the support plate 7, respectively. As a result, stress concentration does not occur at the portions corresponding to the thickness of the vertices 17b and 17d of the support plate 17 unlike the conventional one, and the vertices 17b and 17d serve as fulcrums and extend beyond the fulcrums. The extended surface portions 15a and 16a that have come out are subjected to a load in a state of being widely dispersed in the state of contact with the beam members 11 and 13, and the load is distributed to prevent buckling of the frame material. The strength of the cab can be increased, and the reinforcing function is increased.

  Moreover, since the reinforcing member 14 integrally fixes the three plate members of the first and second contact plates 15 and 16 and the support plate 17 by welding, there is an inclined surface 11a like the left and right beam members 11. Even if it should just fix in the state inclined along this inclined surface 11a, workability improves, and even if the site | part which an abutting plate contacts is an inclined surface, a reliable contact state Therefore, the frame material can be prevented from buckling and the strength of the cab 5 can be increased.

  Of course, the present invention is not limited to the above-described embodiment, and can be used not only between the beam members but also when reinforcing the column member and the beam member, for example. .

  The present invention can be used to increase the strength of a cab in a construction machine such as a hydraulic excavator or a wheel loader.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 5 Cab 9, 10 Column material 11, 12, 13 Beam material 11a Inclined surface 14 Reinforcement material 15, 16 Contact plate 15a, 16a Extension surface part 17 Support plate 17a, 17c Support plate side 17b, 17d Support plate vertex

Claims (2)

  In a construction machine having a cab formed using a pillar material and a beam material as a frame material, a cab is formed by incorporating a reinforcing material into a right-angled corner portion formed between adjacent ones of the frame material. In the reinforcement of the flat plate, the reinforcing material is made up of a flat plate-shaped first and second plate that is faced to each frame member, and a flat plate-shaped support plate having a right triangle shape. It is configured to be integrated with one of the sandwiched sides in contact with the plate surface of the first contact plate and the other second side in contact with the plate surface of the second contact plate. The first and second contact plates are respectively provided with extending surface portions extending in directions along the corresponding sides from the vertex positions of the first and second sides of the support plate. Reinforcing material for cabs in construction machinery.   When at least one of the surfaces on the frame material side where the first and second contact plates are contacted is an inclined surface, the contact plate and the support plate are integrated corresponding to the inclination of the inclined surface. The reinforcing material for a cab in a construction machine according to claim 1.

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