JP5799722B2 - Work machine - Google Patents

Description

  The present invention relates to a work machine such as a hydraulic excavator or a crane, and more particularly to a guard frame structure that covers the periphery of an engine or the like.

  As the working machine becomes larger, the engine and the like become larger because a larger output is required. Along with this, the guard covering the periphery of the engine or the like tends to be high.

  In general, the guard frame is configured on the basis of a plurality of support columns standing on an upper frame. Therefore, as the height of the guard increases, the support becomes longer and is more susceptible to shaking, so the guard tends to become unstable.

  Moreover, there exists a building cover of the hydraulic excavator of patent document 1 regarding this invention. There, a utility chamber is provided apart from the hydraulic oil tank in the left-right direction, and hydraulic equipment is installed between them. The upper surface of the utility room is covered with a utility room cover, and the upper surface of the hydraulic equipment is covered with a rectangular plate-like hydraulic equipment cover.

  One side of the hydraulic equipment cover is attached to the utility chamber cover, and the other side of the hydraulic equipment cover is attached to the hydraulic oil tank.

JP 2011-52455 A

  Conventionally, when the guard becomes high, in order to eliminate the instability, the struts are thickened to increase the rigidity of the struts, the fastening points between the struts are increased to increase the connection strength, the reinforcing material Etc. have been added.

  However, these methods all increase the cost of materials and increase the number of work steps, and therefore more efficient countermeasures are required.

  The hydraulic device cover of Patent Document 1 is also useful for eliminating the instability of the guard, but since it is fixed to the hydraulic oil tank, the hydraulic device cover may be deformed or damaged. That is, since the hydraulic oil tank is more rigid than the guard, there is a difference in the rigidity between the two, and the degree of shaking is also different. For this reason, the hydraulic device cover fixed to the hydraulic device cover may be distorted to cause deformation or the like.

  Accordingly, an object of the present invention is to provide a work machine that can effectively enhance the rigidity of the guard by making good use of the structure of the upper frame.

  The working device according to the present invention is a working machine including a machine body on a lower traveling body. The machine body is supported by the lower traveling body, and constitutes an upper frame constituting the bottom surface of the machine body, a working device installed at the front of the upper frame, and a counterweight installed at the rear of the upper frame And a machine room installed at an intermediate portion of the upper frame, and a guard covering the periphery of the machine room. The guard has a guard frame composed of a plurality of columns and beams, and a guard cover attached to the guard frame.

  The upper frame has a pair of vertical plates that extend in the front-rear direction and are erected so as to support the working device at a front portion. The vertical plate has an inclined portion that gradually decreases from the front to the rear, behind the portion that supports the working device. A support beam extending in the front-rear direction is provided on the inclined portion of at least one of the vertical plates. A front end of the support beam is connected to the inclined portion, and a rear end of the support beam is connected to the guard frame.

  According to the working machine having such a configuration, since the support beam is provided on the vertical plate of the strength member, it is possible to configure a compact and excellent support beam. Moreover, since the support beam is provided on the inclined portion of the vertical plate and the front end thereof is connected to the inclined portion, the support beam can be made more compact, and the rigidity of the support beam is further enhanced. be able to. In addition, since the rear end of the support beam whose rigidity is enhanced in this way is connected to the guard frame, the rigidity of the guard can be effectively enhanced and it is difficult to be affected by the shaking.

  It is preferable that the rear end of the support beam is connected to the vertical plate via a rear support column.

  By doing so, the rigidity of the support beam is further strengthened, and the guard can be further prevented from shaking.

  In addition, a front end of the support beam is connected to the inclined portion via a front support column, and a reinforcing portion extending obliquely upward from the front support column to the rear is provided on the lower side of the support beam. It is preferable to do so.

  Then, when the support beam is directly connected to the vertical plate, the support beam can be shortened when the support beam becomes long and the rigidity is lowered. Even if there is a front support column, the rigidity of the support beam can be effectively enhanced by the reinforcing portion.

  Further, when the hydraulic oil tank is installed on the upper frame with a side surface thereof close to the support beam, and the guard cover includes a step cover installed adjacent to the hydraulic oil tank, It is preferable that an end of the step cover located on the hydraulic oil tank side is attached to the support beam.

  By doing so, the step cover can be installed independently from the hydraulic oil tank, so that distortion generated in the step cover due to the difference in the degree of shaking can be eliminated, and deformation and breakage of the step cover can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the working machine which can strengthen the rigidity of a guard effectively can be provided.

It is the schematic which shows the hydraulic shovel to which this invention is applied. It is the schematic which shows the structure of an upper frame or a guard frame. It is the schematic which shows the external appearance of the rear part of a machine main body. It is the schematic which shows the external appearance of the rear part of a machine main body. It is the schematic which shows arrangement | positioning of a guard frame or an apparatus. It is the schematic which shows the installation site | part of a support beam. It is the schematic seen from the direction of arrow I in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the following description is merely illustrative in nature and does not limit the present invention, its application, or its use.

  FIG. 1 shows a hydraulic excavator 1 (an example of a work machine) to which the present invention is applied. The hydraulic excavator 1 is a relatively large model, and a large machine body 2 is provided on a crawler type lower traveling body 3 so as to be able to turn. The machine main body 2 includes a work device 4, a cab 5, a machine room 6, a counterweight 7, an upper frame 8, and the like. The work device 4 and the like are installed on the upper frame 8.

  In each figure, arrows indicating front and rear, up and down, and left and right directions are appropriately shown. The directions such as front and rear used in the description follow the directions shown in these drawings.

  The working device 4 is installed at the front portion of the upper frame 8. The work device 4 includes a boom 4a, an arm 4b, a bucket 4c, a hydraulic cylinder 4d, and the like. In order to maintain the front-rear balance with the work device 4, a counterweight 7 is installed at the rear portion of the upper frame 8.

  As shown in FIG. 2, the upper frame 8 is a support member that constitutes the bottom surface of the machine body 2, and has a substantially rectangular shape that is long in front and rear in plan view. The upper frame 8 is structurally reinforced by a bottom plate 11, a vertical plate 12, and the like.

  The bottom plate 11 is a thick metal plate that expands in the horizontal direction, and is supported by the lower traveling body 3 so as to be rotatable. A pair of vertical plates 12, 12 are provided in a middle portion in the left-right direction of the upper frame 8, a so-called center section, so as to extend in the front-rear direction while standing on the bottom plate 11. The vertical plates 12 are arranged so as to face each other apart in the left-right direction. Each vertical plate 12 is a thick metal plate, and is fixed to the bottom plate 11 by welding.

  Each vertical plate 12 has a generally triangular shape with a low height, with the top portion being biased toward the front end portion. Therefore, the portion of each vertical plate 12 that continues from the top to the rear is gradually lower from the front toward the rear (this portion is also referred to as an inclined portion 12a). A strip-shaped back plate 13 is integrally welded to the upper end of the inclined portion 12a along the edge so that the cross-sectional shape is T-shaped. The boom 4a and the hydraulic cylinder 4d are supported on the front end portions of the pair of vertical plates 12 whose rigidity is enhanced in this way, and the counterweight 7 is supported on the rear end portion.

  A cab 5, a hydraulic oil tank 22, a fuel tank 21, and the like are installed on the left and right portions of the center section in the upper frame 8, so-called side decks. The cab 5 is installed adjacent to the work device 4 at the front of the left side deck. Although not shown, an operating device and a display device are installed inside the cab 5. When the operator gets into the cab 5 and operates the operating device, the hydraulic cylinder 4d is hydraulically controlled and the boom 4a and the like are activated.

  The fuel tank 21 and the hydraulic oil tank 22 are installed at an intermediate portion in the front-rear direction of the right side deck. The fuel tank 21 is installed adjacent to the front side of the hydraulic oil tank 22. A storage box 23 is installed on the front side of the fuel tank 21.

  As shown in detail in FIGS. 3 and 4, the machine room 6 is mainly installed in a range from the middle in the front-rear direction of the upper frame 8 to the rear part. A bonnet 25 is provided on the upper surface of the machine room 6 so as to cover a device protruding upward from the machine room 6.

  As shown in FIG. 5, various devices such as an engine 27, a cooling device 28, an exhaust device 29, and a control valve 30 are densely installed in the machine room 6. The engine 27 is installed at the rear portion of the upper frame 8 with its drive shaft directed in the left-right direction. A cooling device 28 is installed on the left side of the engine 27, and an exhaust device 29 is installed on the upper right side of the engine 27. The control valve 30 is installed in a space between the left and right vertical plates 12 and 12 in front of the engine 27.

(guard)
The periphery of the machine room 6 is covered with a guard 40. The guard 40 includes a guard cover 41 and a guard frame 42 to which the guard cover 41 is attached.

  The guard cover 41 includes left and right side covers 43L and 43R, an overhanging cover 44, a step cover 45, and the like. The left side cover 43L covers the left side of the machine room 6 and the right side cover 43R covers the right side of the machine room 6, respectively. The upper portions of the side covers 43L and 43R project inward, and the bonnet 25 is attached so as to straddle the projecting portion and the rear beam 48.

  The overhanging cover 44 is installed so as to overhang forward with the overhanging portion of the left side cover 43L. The overhanging cover 44 covers the upper surface of the space behind the cab 5. The fuel tank 21 and the hydraulic oil tank 22 are located on the right side of the overhanging cover 44 with the installation space for the control valve 30 interposed therebetween.

  The step cover 45 is installed between the overhanging cover 44 and the hydraulic oil tank 22 so as to cover the upper part of the control valve 30 (the step cover 45 will be described later separately).

  During regular inspections, the operator may move up to the upper surface of the machine room 6 to perform work. Therefore, the overhanging cover 44 and the step cover 45 are positioned on the same plane so that no step is generated between the upper surface of the fuel tank 21 and the hydraulic oil tank 22 so that the operator can easily work. Yes.

  As shown in FIGS. 2 and 5, the guard frame 42 is a box-shaped frame structure. The guard frame 42 mainly includes a plurality of support columns 46 provided so as to extend upward from the upper frame 8 and the support frames 46. And a plurality of beams 48.

  Specifically, these columns 46 and beams 48 are metal plate press products with structurally enhanced rigidity, and are bent into a L-shaped section, a U-shaped section, or the like according to the installation site. Yes. The lower end portion of each column 46 is attached to a bracket or the like provided on the upper frame 8 by fastening with bolts. Further, the upper end portion of each column 46 is also fastened to each beam 48 with a bolt to be assembled into a predetermined box-shaped frame structure. In some cases, a plate member is assembled in place of the column 46 and the beam 48.

  It should be noted that the structure of the guard frame 42, such as the shape and number of the columns 46 and beams 48, is simplified for convenience.

  In the hydraulic excavator 1, the rigidity of the guard 40 is enhanced by connecting the support beam portion 60 to the guard frame 42.

(Support beam)
The support beam portion 60 is installed using the vertical plate 12 which is a strength member so that the rigidity of the guard 40 can be efficiently enhanced with a small number of members.

  As shown in detail in FIGS. 6 and 7, the support beam portion 60 is installed on the inclined portion 12a of the right vertical plate 12 (also referred to as the right vertical plate 12R). Specifically, it is fixed to the upper surface of the inclined back plate 13 of the right vertical plate 12R.

  The support beam portion 60 includes a reinforcing plate portion 60a, a support beam 60b, a front support column 60c, and the like.

  The reinforcing plate portion 60a, the support beam 60b, and the front support column 60c are integrally formed by bending the periphery of a metal plate having a substantially right triangular shape with a long side. Specifically, the support beam 60b is formed by being bent into an L-shaped cross section along the long side of the metal plate. Similarly, the front support column 60c is formed by being bent into an L-shaped cross section along the short side of the metal plate. The front end of the support beam 60b is connected in an L shape substantially orthogonal to the upper end of the front support column 60c. On the lower side of the support beam 60b, a reinforcing plate portion 60a having a triangular shape that extends obliquely upward from the front support column 60c rearward is formed.

  Thus, the lower end of the front support column 60 c is connected to a bracket 62 fixed to the upper surface of the back plate 13. Further, the rear end of the support beam 60b is connected to an intermediate portion of the beam 48 of the guard frame 42 straddling the right vertical plate 12R. At this time, the support beam 60b is on the same plane as the beam 48 and extends in a substantially horizontal direction. The support beam 60b is connected to the beam 48 in a T shape when viewed from above.

  Therefore, since the guard frame 42 is connected to the support beam 60b fixed to the right vertical plate 12R which is a strength member, the rigidity of the guard 40 can be effectively enhanced. In addition, since the support beam 60b is connected to the beam 48 of the guard frame 42 in a T shape when viewed from above, the rigidity (particularly the rigidity in the left-right direction) is enhanced structurally, and the support beam 60b is more effective. is there.

  Further, the rear end of the support beam 60b is connected to the right vertical plate 12R via the rear support column 61. Specifically, the rear support column 61 is connected to a bracket 64 fixed to the upper surface of the back plate 13 so as to extend upward from the back plate 13, and its upper end is connected to the rear end of the support beam 60b. ing. The rear support column 61 is shorter than the column 46 installed on the upper frame 8 and is excellent in rigidity because the rear support column 61 is installed on the right vertical plate 12R.

  Therefore, since the rigidity of the support beam 60b is enhanced, the rigidity of the guard 40 can be further enhanced.

  Furthermore, a reinforcing plate portion 60a is provided below the support beam 60b. A lower end edge (corresponding to a reinforcing portion) of the reinforcing plate portion 60a extending in an oblique direction is formed in an L-shaped cross section (an inclined wall portion 60d), and the rigidity of the reinforcing plate portion 60a is reinforced.

  Accordingly, the support beam 60b is structurally reinforced in rigidity (particularly in the longitudinal and vertical directions) by the reinforcing plate portion 60a.

  Further, as shown in FIG. 6, in order to enhance the rigidity of the guard 40, the support beam portion 60 is also connected to the front column 47 via an oblique beam 70 that extends obliquely. Specifically, one end of the oblique beam 70 is connected to a portion of the rear support column 61 supported by the bracket 64, and the other end of the oblique beam 70 is connected to the guard frame 42 in an oblique manner.

  Furthermore, a reinforcing beam 71 extending from the rear is attached to the beam 48 to which the support beam 60b is connected, and the guard 40 is further strengthened.

(Relationship with step cover)
As shown in FIGS. 2 and 5, the hydraulic oil tank 22 is located on the right side of the support beam portion 60. Specifically, the support beam portion 60 is located close to the left side surface of the hydraulic oil tank 22. Therefore, the support beam 60b of this embodiment is also used as a support member for the step cover 45.

  As described above, the step cover 45 is installed between the overhanging cover 44 and the hydraulic oil tank 22 so as to cover the upper side of the control valve 30. In the hydraulic excavator 1, the left end portion of the step cover 45 is attached to the overhanging cover 44, and the right end portion of the step cover 45 is attached to the support beam 60b.

  Therefore, unlike the conventional model, since the step cover 45 is installed independently from the hydraulic oil tank 22, deformation and breakage of the step cover 45 can be suppressed.

(Relationship with hydraulic oil tank)
As shown in FIGS. 6 and 7, a plurality of hydraulic hoses 73 are passed below the support beam 60b. Specifically, since the lower side of the rear end side of the support beam 60b opens upward, a plurality of hydraulic hoses 73 are arranged so as to cross there. In addition, in FIG. 6 etc., the hydraulic hose 73 is cut off and represented for the sake of convenience.

  These hydraulic hoses 73 are connected to an oil return port (not shown) provided on the left side surface of the hydraulic oil tank 22. Since the oil return port is for returning the hydraulic oil to the hydraulic oil tank 22, it is usually positioned above the hydraulic oil tank 22. On the other hand, in the hydraulic excavator 1, the reinforcing plate portion 60a is formed to be inclined, so that the hydraulic hose 73 can be connected to the hydraulic oil tank 22 without any trouble.

  In addition, the working machine according to the present invention is not limited to the above-described embodiment, and includes various other configurations.

  For example, the type and arrangement of the devices such as the engine 27 installed on the upper frame 8 are examples, and can be appropriately changed according to the specifications. For example, the arrangement of each member or device may be reversed. The front end of the support beam 60b may be directly attached to the right vertical plate 12R by omitting the front support column 60c. The support beams may be provided on the left and right vertical plates. The reinforcing portion may be a rod-like oblique cross.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Machine main body 3 Lower traveling body 4 Working apparatus 6 Machine room 7 Counterweight 8 Upper frame 12 (12R) Vertical plate 12a Inclined part 22 Hydraulic oil tank 40 Guard 41 Guard cover 42 Guard frame 45 Step cover 46 Post 48 Beam 60 Support beam portion 60a Reinforcement plate portion 60b Support beam 60c Front support column 63d Slope wall portion 61 Rear support column

Claims (4)

A work machine having a machine body on a lower traveling body,
The machine body is
An upper frame supported by the lower traveling body and constituting a bottom surface of the machine body;
A working device installed at the front of the upper frame;
A counterweight installed at the rear of the upper frame;
A machine room installed in the middle of the upper frame;
A guard covering the periphery of the machine room;
With
The guard is
A guard frame composed of a plurality of columns and beams;
A guard cover attached to the guard frame;
Have
The upper frame has a pair of vertical plates that extend in the front-rear direction and are erected so as to support the working device at a front portion.
The guard frame has a horizontal beam straddling the vertical plate,
The vertical plate has an inclined portion that gradually decreases from the front to the rear, behind the portion that supports the working device,
A support beam extending in the front-rear direction is provided on the inclined portion of at least one vertical plate,
A work machine in which a front end of the support beam is connected to the inclined portion, and a rear end of the support beam is connected to the horizontal beam in a T-shape . The work machine according to claim 1,
A work machine in which a rear end of the support beam is connected to the vertical plate via a rear support column. In the work machine according to claim 1 or 2,
A front end of the support beam is connected to the inclined portion via a front support column;
A work machine in which a reinforcing portion extending obliquely upward from the front support column toward the rear is provided below the support beam. In the working machine according to any one of claims 1 to 3,
A hydraulic oil tank is installed on the upper frame with its side face close to the support beam,
The guard cover includes a step cover installed adjacent to the hydraulic oil tank,
A work machine in which an end portion of the step cover located on the hydraulic oil tank side is attached to the support beam.

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