JP2013087462A - Upper frame of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deformation of a beam board in its plate thickness direction by devising the structure and the arrangement of a support bracket.SOLUTION: An engine bracket 40 includes: a pair of engine supporting leg plates 41 arranged with a space in a vehicle width direction; and an engine base plate 42 joined to the upper end parts of the pair of engine supporting leg plates 41, so as to extend over them. A cab bracket 50 includes: a cab supporting leg plate 51; and a cab base plate 52 joined to the upper end part of the cab supporting leg plate 51 and horizontally projecting. The side edges of the pair of engine supporting leg plates 41 are joined to a surface on a vehicle rear side. The side edge of the cab supporting leg plate 51 is joined to a surface on the vehicle front side of a beam board 23, and between the pair of engine supporting leg plates 41 in a view from its plate surface side.

Description

  The present invention relates to an upper frame of a construction machine.

  Conventionally, a construction machine including a lower traveling body and an upper swing body mounted on the lower traveling body is known (see, for example, Patent Document 1). The upper swing body includes an upper frame as a vehicle body frame. The upper frame includes a bottom plate, a pair of vertical plates standing on the bottom plate and extending in the vehicle front-rear direction, and a beam plate connecting the vertical plates. The upper frame is provided with a support bracket for mounting an engine, a cab and the like.

  Here, in consideration of cost reduction and weight reduction by reducing the number of parts and the welding amount, the support bracket is formed by welding a pedestal plate that protrudes horizontally to the upper end of one support leg plate. In general, the bracket structure has a T-shaped cross section.

  The support bracket secures strength and rigidity by welding a support leg plate of the support bracket to a beam plate as a strength member. For example, a cab bracket is welded to the front surface of the beam plate and the engine bracket is welded to the rear surface of the beam plate.

JP 2009-057995 A

  However, if the support bracket is welded to both sides of the beam plate in the vehicle front-rear direction, there is a problem that the beam plate is deformed by a load when the engine or the cab is mounted.

  Specifically, when the support leg plate for the cab and the support leg plate for the engine are welded to a position offset from each other in the vehicle width direction, the support leg plate is deformed by a load when the engine or the cab is mounted, Along with this deformation, the beam plate is twisted in the thickness direction.

  This invention is made | formed in view of this point, The objective is to suppress that a beam board deform | transforms in a plate | board thickness direction by devising the structure and arrangement | positioning of a support bracket.

  The present invention includes a bottom plate, a pair of vertical plates standing on the bottom plate and extending in the vehicle front-rear direction, a beam plate standing on the bottom plate and connecting the vertical plates, and first and second devices. For the upper frame of a construction machine having first and second support brackets for mounting, the following solution was taken.

That is, according to the first aspect of the present invention, the first support bracket includes a pair of first support leg plates that extend above the upper end of the beam plate along the beam plate and are spaced from each other in the vehicle width direction. A first pedestal plate joined to the upper end of the pair of first support leg plates,
The second support bracket includes a second support leg plate extending above the upper end of the beam plate along the beam plate, and a second pedestal plate that is joined to the upper end portion of the second support leg plate and extends in the horizontal direction. And
Side edges of the pair of first support leg plates are joined to one surface of the beam plate,
The side edge portion of the second support leg plate is joined to the other surface of the beam plate and between the pair of first support leg plates when viewed from the plate surface side.

  In the first invention, the first support bracket includes a pair of first support leg plates and a first base plate. The pair of first support leg plates extend above the upper end of the beam plate along the beam plate and are spaced apart in the vehicle width direction. The first base plate is joined to the upper end portion so as to straddle the pair of first support leg plates. The second support bracket includes a second support leg plate and a second pedestal plate. The second support leg plate extends above the upper end of the beam plate along the beam plate. The second pedestal plate is joined to the upper end portion of the second support leg plate and extends in the horizontal direction. The side edges of the pair of first support leg plates are joined to one surface of the beam plate. A side edge portion of the second support leg plate is joined between the pair of first support leg plates as viewed from the other surface of the beam plate and the plate surface side.

  With such a configuration, by devising the structure and arrangement of the first and second support brackets, the beam plate will be deformed in the thickness direction by the load when the first and second devices are mounted. Can be suppressed.

  Specifically, when the first support leg plate and the second support leg plate are welded at positions offset from each other in the vehicle width direction, the first and second devices are loaded depending on the load when the first and second devices are mounted. The support leg plate is deformed, and the beam plate is twisted in the thickness direction along with the deformation.

  On the other hand, in the present invention, the second support leg plate is disposed between the pair of first support legs as viewed from the plate surface side of the beam plate, so that it depends on the load when the second device is mounted. Even if the second support leg plate is to be deformed, the deformation is prevented by the pair of first support leg plates, and the beam plate can be prevented from being twisted and deformed in the plate thickness direction.

  Furthermore, when the first support bracket is joined to one surface of the beam plate and the second support bracket is joined to the other surface, the first and second support brackets are joined only to one surface of the beam plate. As compared with the above, it is possible to suppress the bending of the beam plate in the thickness direction.

  Specifically, the first and second support brackets fall down in the vehicle front-rear direction due to loads when the first and second devices are mounted. That is, since the beam plates are pulled from both sides in the plate thickness direction, the beam plates can be prevented from being bent in the plate thickness direction.

  In addition, if it is set as the structure which supports 1st and 2nd apparatus with one support bracket, the deformation | transformation of a beam plate as mentioned above can be suppressed. However, when the first and second devices are supported by one support bracket, the support bracket resonates due to load fluctuations associated with the operation work and traveling of the construction machine. Therefore, as in the present invention, the first and second devices are preferably supported by independent first and second support brackets, respectively.

According to a second invention, in the first invention,
A third support leg plate extending above the upper end of the beam plate along the beam plate, and comprising a third support bracket for mounting a third device;
The third support leg plate is joined to the other surface of the beam plate and at an outer position in the vehicle width direction than the pair of first support leg plates when viewed from the plate surface side. is there.

  In 2nd invention, the 3rd support bracket for mounting 3rd apparatus is provided. The third support bracket has a third support leg plate extending above the upper end of the beam plate along the beam plate. A third support leg plate is joined to the other surface of the beam plate at an outer position in the vehicle width direction than the pair of first support leg plates when viewed from the plate surface side.

  With such a configuration, the third support leg plate is disposed outside the pair of first support leg plates in the vehicle width direction when viewed from the plate surface side of the beam plate. Even if the third support leg plate is to be deformed by the load when it is mounted, the deformation is prevented by the pair of first support leg plates, and the beam plate can be prevented from being twisted and deformed in the thickness direction.

According to a third invention, in the first or second invention,
At least the second support leg plate has a lower edge joined to the upper surface of the bottom plate.

  In the third invention, at least the lower edge portion of the second support leg plate is joined to the upper surface of the bottom plate. With such a configuration, even if the second support leg plate falls into the other side of the beam plate due to a load when the second device is mounted, the lower edge portion of the second support leg plate is received by the bottom plate. The beam plate can be prevented from bending in the plate thickness direction.

According to a fourth invention, in any one of the first to third inventions,
The first support bracket includes a first reinforcing plate disposed between the pair of first support leg plates and having both ends joined to the first support leg plate.

  In the fourth invention, the first support bracket includes a first reinforcing plate. The first reinforcing plate is disposed between the pair of first support leg plates, and both ends thereof are joined to the first support leg plate. With such a configuration, the strength and rigidity of the first support bracket can be increased.

According to a fifth invention, in any one of the first to fourth inventions,
The second support bracket has a base end portion joined to the other surface of the beam plate, and a distal end portion joined to the lower surface of the second pedestal plate and projecting horizontally from the base end portion. A second reinforcing plate that is bent and extends to the tip, and whose side edge is joined to the plate surface of the second support leg plate;
A part of the base end portion of the second reinforcing plate overlaps the first support leg plate as viewed from the plate surface side of the beam plate.

  In the fifth invention, the second support bracket includes a second reinforcing plate. The base end portion of the second reinforcing plate is joined to the other surface of the beam plate. The tip of the second reinforcing plate is joined to the lower surface of the second pedestal plate. The second reinforcing plate extends from the proximal end portion in the horizontal direction and then bends and extends to the distal end portion. The side edge portion of the second reinforcing plate is joined to the plate surface of the second support leg plate. A part of the base end portion of the second reinforcing plate overlaps the first support leg plate as viewed from the plate surface side of the beam plate.

  With such a configuration, since the side edge portion of the second reinforcing plate is joined to the plate surface of the second supporting leg plate, and the base end portion of the second reinforcing plate is joined to the plate surface of the beam plate, the second The load applied in the thickness direction of the support leg plate can be received by the beam plate via the second reinforcing plate. Thereby, it can suppress that a 2nd support leg plate vibrates or deform | transforms in a plate | board thickness direction. Moreover, since a part of base end part of the 2nd reinforcement board has overlapped with the 1st support leg board seeing from the plate | board surface side of a beam board, the rigidity of a 2nd support bracket can further be improved.

  According to the present invention, since the second support leg plate is disposed between the pair of first support legs as viewed from the plate surface side of the beam plate, the second load is applied when the second device is mounted. Even if the support leg plate is to be deformed, the deformation is prevented by the pair of first support leg plates, and the beam plate can be prevented from being twisted and deformed in the plate thickness direction.

  Furthermore, when the first support bracket is joined to one surface of the beam plate and the second support bracket is joined to the other surface, the first and second support brackets are joined only to one surface of the beam plate. As compared with the above, it is possible to suppress the bending of the beam plate in the thickness direction.

1 is a side view showing an overall configuration of a construction machine according to an embodiment of the present invention. It is a top view which shows the structure of an upper frame. It is a perspective view which shows the structure of each support bracket periphery. It is a perspective view which shows the structure of each support bracket. It is a side view which shows arrangement | positioning of each support bracket. It is a top view which shows arrangement | positioning of each support bracket.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view showing an overall configuration of a construction machine according to an embodiment of the present invention, and FIG. 2 is a plan view showing the configuration of an upper frame. As shown in FIGS. 1 and 2, the construction machine 10 is a hydraulic excavator in which a swingable upper swing body 2 is mounted on a crawler type lower traveling body 1.

  The upper swing body 2 includes an upper frame 20 as a vehicle body frame, an attachment 4 that is provided on the front end side of the upper frame 20 and performs excavation work such as earth and sand, a cab 5, a machine room 6, and a rear of the upper frame 20. A counterweight 7 is provided on the end side to balance the weight with the attachment 4.

  In this embodiment, in FIG. 1, the side on which the attachment 4 on the left side of the drawing is arranged is the front side of the vehicle, and the side on which the cab 5 on the front side of the paper is arranged is the left side of the vehicle. Shall follow unless otherwise stated.

  The attachment 4 is located in the middle of the upper swing body 2 in the left-right width direction and in front of the upper frame 20. The attachment 4 includes a boom 11 rotatably attached to a pair of vertical plates 22 provided on the upper frame 20 on the base end side, an arm 12 rotatably attached to the distal end side of the boom 11, and an arm 12. And a bucket 13 rotatably attached to the front end side. These booms 11 and the like are displaced in conjunction with the expansion / contraction operation of the hydraulic cylinder 14 that is hydraulically controlled.

  The cab 5 is located at the left front portion of the upper frame 20. The cab 5 is a cab whose periphery is covered with a rectangular box-shaped cover. A seat on which an operator is seated is installed inside the cab 5, and electrical equipment related to driving operations such as an operating device and a display device is installed around the seat.

  The machine room 6 is located from the right front part to the rear part of the upper swing body 2. Inside the machine room 6, a fuel tank 15, a hydraulic oil tank 16, an engine 17 and the like are installed in a dense state.

  The counterweight 7 is installed at the rear portion of the upper frame 20 so as to maintain a front-rear balance with the attachment 4. In the case of this model, the counterweight 7 also serves as a rear cover of the machine room 6.

  The upper frame 20 is a support member that is structurally strengthened in strength and rigidity, and has a substantially rectangular appearance in plan view. The upper frame 20 is erected in the front-rear direction by standing from the bottom plate 21, a pair of left and right vertical plates 22, a beam plate 23 connecting the vertical plates 22, and the pair of vertical plates 22. A pair of side frames 24, a front frame 25 erected on the front end of the bottom plate 21 and extending in the left-right direction, and a side frame connecting plate 26 that connects the vertical plate 22 and the side frame 24.

  The bottom plate 21 constitutes a bottom surface of the upper frame 20 and is formed of a thick metal plate disposed so that the plate surface extends in a substantially horizontal direction.

  The vertical plate 22 is formed of a thick metal plate, and is welded to the upper surface of the bottom plate 21 in a state of being erected from the bottom plate 21. The pair of left and right vertical plates 22 are arranged so as to be separated in the left-right direction and extend in the front-rear direction. The front end portion of the vertical plate 22 projects forward from the front frame 25 and constitutes a support portion 22 a that supports the attachment 4.

  The beam plate 23 is composed of a thick metal plate disposed between a pair of vertical plates 22. The beam plate 23 is welded to the upper surface of the bottom plate 21 while being erected from the bottom plate 21. The left and right ends of the beam plate 23 are welded to the plate surface of the vertical plate 22. As a result, the pair of vertical plates 22 are connected by the beam plate 23. Four beam plates 23 are arranged at intervals in the longitudinal direction of the vehicle.

  The front end of the side frame 24 is joined to the front frame 25. Between the right vertical plate 22 and the side frame 24, a fuel tank bracket 30 formed by bending a metal plate is disposed. The left and right ends of the fuel tank bracket 30 are welded to the plate surface of the vertical plate 22 and the plate surface of the side frame 24, respectively. As a result, the right vertical plate 22 and the side frame 24 are connected by the fuel tank bracket 30. The fuel tank brackets 30 are arranged in the vehicle longitudinal direction. The fuel tank 15 is mounted on the fuel tank bracket 30.

  Between the left vertical plate 22 and the side frame 24, a side frame connecting plate 26 made of a thick metal plate is disposed. The left and right ends of the side frame connecting plate 26 are welded to the plate surface of the vertical plate 22 and the plate surface of the side frame 24, respectively. Accordingly, the left vertical plate 22 and the side frame 24 are connected by the side frame connecting plate 26. The side frame connecting plates 26 are arranged so as to be aligned in the vehicle front-rear direction. Further, a side frame connecting plate 26 is also disposed on the right rear portion of the upper frame 20, and the right vertical plate 22 and the side frame 24 are connected by the side frame connecting plate 26.

  The upper frame 20 is provided with a support bracket for mounting equipment. Specifically, an engine bracket 40 (first support bracket) for mounting the engine 17 as the first device and a cab bracket 50 (second support bracket) for mounting the cab 5 as the second device. ) And a hydraulic oil tank bracket 60 (third support bracket) for mounting the hydraulic oil tank 16 as the third device.

  The engine bracket 40 is welded to each of the third and fourth beam plates 23 and the left vertical plate 22 counted from the front side among the four beam plates 23 arranged in the vehicle longitudinal direction. The cab bracket 50 is welded to the front frame 25, the third beam plate 23, and the left side frame 24, respectively. The hydraulic oil tank bracket 60 is welded to the second and third beam plates 23, respectively.

  As shown in FIGS. 3 to 6, the engine bracket 40 welded to the vehicle rear surface of the third beam plate 23 includes a pair of engine support leg plates 41, an engine base plate 42, an engine The reinforcing plate 43 is provided.

  The pair of engine support leg plates 41 are arranged at intervals in the vehicle width direction, and are welded to the upper surface of the bottom plate 21 in a state of being erected from the bottom plate 21. The engine support leg plate 41 extends above the upper end of the beam plate 23 along the beam plate 23. The front side edge portion of the engine support leg plate 41 is welded to the rear surface of the beam plate 23.

  The engine base plate 42 is welded to the upper end portion so as to straddle the pair of engine support leg plates 41, and is positioned above the beam plate 23. Thereby, the engine bracket 40 welded to the beam plate 23 has a gate-shaped cross section.

  The engine reinforcing plate 43 is disposed between the pair of engine support leg plates 41 while being inclined obliquely downward toward the vehicle front side, and both end portions thereof are welded to the engine support leg plates 41.

  The cab bracket 50 welded to the front surface of the third beam plate 23 includes a cab support leg plate 51, a cab pedestal plate 52, and a cab reinforcement plate 53.

  The cab support leg plate 51 is welded to the upper surface of the bottom plate 21 in a state of being erected from the bottom plate 21. The cab support leg plate 51 extends above the upper end of the beam plate 23 along the beam plate 23. The rear side edge portion of the cab support leg plate 51 is disposed between the pair of engine support leg plates 41 when viewed from the plate surface side of the beam plate 23, and is welded to the plate surface of the beam plate 23. The upper portion of the cab support leg plate 51 extends while being inclined obliquely upward toward the vehicle front side.

  The cab base plate 52 is welded to the upper end portion of the cab support leg plate 51 and projects in the horizontal direction, and is positioned above the beam plate 23. Accordingly, the cab bracket 50 welded to the beam plate 23 has a T-shaped cross section.

  With such a configuration, even if the cab support leg plate 51 is to be deformed by a load when the cab 5 is mounted, the deformation is prevented by the pair of engine support leg plates 41. Thereby, it can suppress that the beam board 23 twists and deform | transforms in the board thickness direction.

  Further, since the engine bracket 40 is welded to the rear surface of the beam plate 23 and the cab bracket 50 is welded to the front surface of the beam plate 23, the beam plate 23 is pulled from both sides in the thickness direction. It will be in the state. Therefore, the bending of the beam plate 23 in the plate thickness direction can be suppressed as compared with the case where the engine bracket 40 and the cab bracket 50 are welded to only one surface of the beam plate 23.

  In the cab bracket 50 having a T-shaped cross section, a load is applied in the thickness direction of the cab support leg plate 51 due to a load variation caused by an operation operation or traveling of the construction machine 10, so that the cab support leg plate 51 vibrates. There is a problem of being deformed or deformed. Therefore, in the present embodiment, the cab reinforcing plate 53 is attached as a reinforcing rib for suppressing vibration and deformation in the thickness direction of the cab supporting leg plate 51.

  The base end portion of the cab reinforcing plate 53 is welded to a position near the upper end of the plate surface of the beam plate 23 so that a part thereof overlaps the engine support leg plate 41 when viewed from the plate surface side of the beam plate 23. Yes. The tip of the cab reinforcing plate 53 is welded to the lower surface of the cab base plate 52. The cab reinforcing plate 53 extends from the proximal end portion in the horizontal direction and then bends and extends to the distal end portion. Specifically, the cab reinforcing plate 53 extends along substantially the center position of the width of the cab support leg plate 51 in a side view. That is, similarly to the upper part of the cab support leg plate 51, the upper part of the cab reinforcing plate 53 extends while being inclined obliquely upward toward the vehicle front side. The right side edge of the cab reinforcing plate 53 is welded to the plate surface of the cab support leg plate 51.

  The hydraulic oil tank bracket 60 welded to the front surface of the third beam plate 23 includes a hydraulic oil tank support leg plate 61, a hydraulic oil tank pedestal plate 62, and a hydraulic oil tank reinforcement plate 63. It has.

  The hydraulic oil tank support leg plate 61 extends above the upper end of the beam plate 23 along the beam plate 23. The hydraulic oil tank support leg plate 61 is welded to the beam plate 23 with its plate surface in contact with the beam plate 23. Here, the left end edge of the hydraulic oil tank support leg plate 61 is disposed at an outer position in the vehicle width direction than the engine support leg plate 41 when viewed from the plate surface side of the beam plate 23.

  The hydraulic oil tank pedestal plate 62 is formed by bending the upper end portion of the hydraulic oil tank support leg plate 61, projects in the horizontal direction, and is positioned above the beam plate 23.

  The hydraulic oil tank reinforcing plate 63 extends from the lower end of the hydraulic oil tank support leg plate 61 toward the lower surface of the hydraulic oil tank base plate 62 and functions as a reinforcing rib.

<< Other Embodiments >>
About the said embodiment, it is good also as following structures.

  In the above-described embodiment, the engine bracket 40 is welded to the vehicle rear surface of the beam plate 23, while the cab bracket 50 and the hydraulic oil tank bracket 60 are welded to the vehicle front surface of the beam plate 23. However, it is not particularly limited to this form. For example, the engine bracket 40 may be welded to the vehicle rear surface of the beam plate 23, while only the cab bracket 50 may be welded to the vehicle front surface of the beam plate 23.

  As described above, the present invention provides a highly practical effect that the beam plate can be prevented from being deformed in the plate thickness direction by devising the structure and arrangement of the support bracket. It is extremely useful and has high industrial applicability.

5 Cab (second equipment)
10 Construction machinery 16 Hydraulic oil tank (third equipment)
17 Engine (first equipment)
20 Upper frame 21 Bottom plate 22 Vertical plate 23 Beam plate 40 Engine bracket (first support bracket)
41 Engine support leg plate (first support leg plate)
42 Pedestal plate for engine (first pedestal plate)
43 Engine reinforcement plate (first reinforcement plate)
50 Bracket for cab (second support bracket)
51 Support leg plate for cab (second support leg plate)
52 Base plate for cab (second base plate)
53 Reinforcing plate for cab (second reinforcing plate)
60 Hydraulic oil tank bracket (third support bracket)
61 Hydraulic oil tank support leg plate (third support leg plate)

Claims (5)

A bottom plate, a pair of vertical plates standing on the bottom plate and extending in the vehicle front-rear direction, a beam plate standing on the bottom plate and connecting the vertical plates, and a first and second device for mounting An upper frame of a construction machine including first and second support brackets,
The first support bracket includes a pair of first support leg plates extending above the upper end of the beam plate along the beam plate and spaced from each other in the vehicle width direction, and the pair of first support leg plates. And a first pedestal plate joined to the upper end portion so as to straddle,
The second support bracket includes a second support leg plate extending above the upper end of the beam plate along the beam plate, and a second pedestal plate that is joined to the upper end portion of the second support leg plate and extends in the horizontal direction. And
Side edges of the pair of first support leg plates are joined to one surface of the beam plate,
An upper frame of a construction machine, wherein a side edge portion of the second support leg plate is joined between the pair of first support leg plates as viewed from the other surface of the beam plate and the plate surface side. . In claim 1,
A third support leg plate extending above the upper end of the beam plate along the beam plate, and comprising a third support bracket for mounting a third device;
The construction machine, wherein the third support leg plate is joined to the other side of the beam plate and at an outer position in the vehicle width direction than the pair of first support leg plates when viewed from the plate surface side. Upper frame. In claim 1 or 2,
The upper frame of a construction machine, wherein at least the second support leg plate has a lower edge joined to an upper surface of the bottom plate. In any one of claims 1 to 3,
The upper frame of a construction machine, wherein the first support bracket includes a first reinforcing plate disposed between the pair of first support leg plates and having both ends joined to the first support leg plate. . In any one of claims 1 to 4,
The second support bracket has a base end portion joined to the other surface of the beam plate, and a distal end portion joined to the lower surface of the second pedestal plate and projecting horizontally from the base end portion. A second reinforcing plate that is bent and extends to the tip, and whose side edge is joined to the plate surface of the second support leg plate;
An upper frame of a construction machine, wherein a part of the base end portion of the second reinforcing plate overlaps the first support leg plate as viewed from the plate surface side of the beam plate.

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