JP2013083092A - Upper frame of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an upper frame 10 of a construction machine 100, including: a center section 20 with a base plate 28 and right/left vertical plates 24, 25 extending in a back and forth direction as erected on the base plate 28; and right and left deck parts 21, 22 that are provided respectively on right and left sides of the center section 20 and have side frames 26, 27 extended in a back and forth direction and connection members 30, 40 for connecting the side frames 26, 27 with the center section 20, in which the upper frame improves routing performance of piping such as a hydraulic hose 151 by devising its structure while a width of a cab 12 is fully secured.SOLUTION: A front end of each of vertical plates 24, 25 is projected more forward than the front end of each of side frames 26, 27 so as to provide working machine mounting parts to the projected vertical plate parts 24a, 25a. Height of vertical plate body parts 24b, 25b of each of the vertical plates 24, 25 is set to be lower than the height of the right and left side frames 26, 27.

Description

  It belongs to the technical field related to the upper frame of construction machinery.

  2. Description of the Related Art Conventionally, there is known an upper frame having a so-called deck structure including a center section to which a work machine is attached and deck portions provided on the left and right sides of the center section (see, for example, Patent Document 1). Each of the left and right deck portions includes a side frame extending in the front-rear direction and a connecting member that connects the side frame to the center section. Among the left and right deck sections, one deck section is usually provided with equipment such as a hydraulic oil tank and a control valve, and the other deck section is provided with a cab that forms a cab.

  The center section includes a bottom plate and a pair of left and right vertical plates that stand on the bottom plate and extend in the front-rear direction. The vertical plate is formed in a triangular shape with a front end protruding upward in a side view, and the bottom side is fixed to the bottom plate by welding or the like. A base end portion of the boom of the work machine is rotatably supported by a pin connection on the raised portion of the vertical plate. In this way, by raising the support portion of the work machine in the vertical plate, the cross-sectional area of the vertical plate is increased in the vertical direction to improve the support rigidity of the work machine.

  The vertical plate is formed with a through hole as seen in, for example, Patent Document 2 (particularly FIG. 4), and the electrical wiring and hydraulic piping (hose piping) of the devices arranged in the deck section are After being guided to the space between the left and right vertical plates through this through hole, it is guided to a working machine or engine mounted on the center section.

JP 2011-99283 A Patent No. 4740088

  However, in the conventional upper frame shown in Patent Documents 1 and 2, since the vertical plate is greatly raised upward in a side view, when the width of the cab mounted on the deck portion is increased, the raised vertical frame is increased. The plate will interfere with the cab. As a result, the width of the cab is limited by the vertical plate, and there is a problem that a sufficient operating space in the cab cannot be secured.

  In addition, when assembling the construction machine, it is necessary to pass the electrical wiring and piping of the equipment mounted on the deck section through the through-hole formed in the vertical plate of the center section. There is a problem that is bad. Therefore, there is room for improvement from the viewpoint of improving the assembly property (mass productivity) of the construction machine.

  The present invention has been made in view of such a point, and an object of the present invention is to ensure a sufficient width of the cab (can be freely set) and to assemble a construction machine. At this time, an object of the present invention is to provide an upper frame capable of easily performing wiring work such as electric wiring and piping.

  In order to achieve the above object, according to the present invention, the front end portion of the vertical plate protrudes to the front side of the front end portion of the side frame, and a work implement mounting portion is provided on the protrusion portion. The height of the vertical plate main body, which is a portion located between the two, is set to be equal to or lower than the height of the left and right side frames.

  Specifically, in the first aspect of the present invention, a center section having a bottom plate and left and right vertical plates extending in the front-rear direction and provided on the left and right sides of the center section and extending in the front-rear direction are provided. Left and right deck portions having a side frame and a connecting member for connecting the side frame to the center section, and a work implement mounting portion for mounting the work implement is formed at the front end portions of the left and right vertical plates. The target is the upper frame of construction machinery.

  And each said vertical board is a front side rather than the front-end part of the side frame of each said deck part extended from the front-end part of the vertical-plate main-body part located between the said right-and-left side frames, and the front-end part of this vertical-plate main-body part. And the height of the vertical plate main body with respect to the bottom plate as a reference is at least within the cab mounting region. It shall be equal to or lower than the height with respect to the above-mentioned bottom plate.

  According to this configuration, the front end portion of the vertical plate protrudes to the front side of the left and right side frames, and the working machine mounting portion is provided on the protruding portion, so that a relatively large dimension is required in the vertical direction. The working machine mounting portion of the vertical plate can be positioned in front of the left and right deck portions. In addition, the height of the vertical plate body located between the left and right side frames is set to be equal to or lower than the height of the left and right side frames at least within the cab mounting area. The vertical plate, which is the main skeleton member, does not protrude upward from the upper surface of the cab mounting area. Therefore, the width of the cab can be freely set without being restricted by the vertical plate.

  Further, the cab is normally supported at the same height position as the upper surfaces of the left and right side frames with respect to the upper frame or slightly higher than the upper frame. Insertion space for inserting electrical wiring and hydraulic piping between the upper edge of the vertical plate body and the lower surface of the cab by setting it to be equal to or lower than the height of the side frame in the cab mounting area Can be secured. Therefore, the wiring work of wiring can be facilitated as compared with the conventional upper frame in which the through-hole for wiring is formed in the vertical plate. Further, since it is not necessary to form a through hole in the vertical plate, there is no possibility that the strength and rigidity of the vertical plate are reduced.

  In the present specification, the term “height” means a height based on the bottom plate unless otherwise specified.

  In the invention of claim 2, in the invention of claim 1, at least one of the left and right vertical plates is provided with a cab support portion for supporting the cab, and the cab support portion is a floor surface of the cab. The height of each vertical plate main body with respect to the bottom plate is higher than the height of the seat surface of the pedestal with reference to the bottom plate at least in the cab mounting region. Is also low.

  According to this configuration, the height of the vertical plate main body is set to be lower than the seat surface height of the pedestal portion of the cab support portion at least in the cab mounting region, so the cab supported by the seat surface. And the vertical plate do not interfere with each other. Therefore, the width of the cab can be freely set without worrying about interference with the vertical plate. In addition, since a gap space is formed between the lower surface of the cab and the upper edge of the vertical plate main body portion with the cab placed on the seat surface of the cab support portion, a through hole may be provided in the vertical plate. Even without this, electrical wiring and piping from the equipment mounted on the deck can be routed between the left and right vertical plates from this gap space and routed toward the work equipment mounted on the center section. .

  According to a third aspect of the invention, in the first or second aspect of the invention, at least one of the left and right deck portions is equipped with equipment necessary for the operation of the construction machine, and the upper edge of each vertical plate main body portion. A gap space that allows passage of electrical wiring or hydraulic piping extending from the device into the center section is formed between the pedestal portion and the extended surface of the seat portion.

  According to this structure, the same effect as that of the invention of claim 2 can be obtained with certainty.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the boundary portion between the vertical plate main body portion and the protruding portion of the left and right vertical plates is connected across the left and right vertical plates. A back plate shall be provided.

  According to this configuration, it is possible to reduce the vertical swing of the upper frame caused by the vertical movement of the work implement, and to secure sufficient strength against the reaction force during excavation work. be able to.

  That is, in the upper frame according to the present invention, the work implement mounting portion provided at the front end portions of the left and right vertical plates protrudes forward from the left and right side frames (left and right deck portions). The strength of the base portion, that is, the strength of the boundary portion between the non-projecting portion and the projecting portion of the vertical plate will be lower than before. On the other hand, in the invention of claim 4, the left and right vertical plates are connected by providing a back plate at the boundary between the vertical plate main body portion and the protruding portion of the left and right vertical plates. The bending rigidity (strength) in the vertical direction of the upper frame with the boundary portion as a fulcrum can be improved. Therefore, the bending deformation of the upper frame accompanying the vertical movement of the work implement or excavation work can be reliably suppressed.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the back plate is formed with a hole through which the electric wiring or piping routed in the center section can be inserted.

  According to this configuration, the left and right vertical plates can be formed without deteriorating the wiring property of the wiring and piping toward the work machine by forming the hole portion through which electrical wiring or piping can be inserted in the back plate. It is possible to improve the bending rigidity in the vertical direction of the upper frame with the vicinity of the boundary between the vertical plate main body portion and the protruding portion as a fulcrum.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the upper frame is rotatably supported via a bearing with respect to the lower traveling body of the construction machine, and is provided on the lower surface of the bottom plate of the center section. A bearing fixing portion to which the slewing bearing is fixed is provided, and a beam plate extending in the left-right direction is erected on a portion of the upper surface of the bottom plate that is positioned directly above the front end portion of the bearing fixing portion. It shall be.

  According to this configuration, it is possible to improve the vertical bending rigidity with the vicinity of the front end portion of the bearing fixing portion of the bottom plate as a fulcrum. Therefore, the same effect as that of the invention of claim 4 can be obtained more reliably.

  As described above, according to the upper frame of the construction machine of the present invention, the front end portion of the vertical plate protrudes to the front side of the front end portion of the side frame, and the working machine mounting portion is provided on the protrusion portion. The height of the vertical plate body, which is the part located between the left and right side frames, is set to be equal to or lower than the height of the left and right side frames, so that the width of the cab is restricted by the vertical plate. It can be set freely without receiving, and wiring and piping arrangement work can be easily performed when the construction machine is assembled.

1 is a schematic side view showing a hydraulic excavator as a construction machine having an upper frame according to an embodiment of the present invention. It is the perspective view seen from the left back and upper direction which shows an upper frame. It is the top view seen from the upper side which shows the state which attached the control valve to the upper frame. It is the perspective view seen from the lower left side which shows an upper frame. It is the side view seen from the left side which shows an upper frame. It is the side view seen from the right side which shows an upper frame. It is the perspective view seen from the front upper part which shows an upper frame. It is the schematic which shows the VIII-VIII sectional view taken on the line of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Overall configuration>
FIG. 1 shows a construction machine 100 having an upper frame 10 according to an embodiment of the present invention, and this construction machine 100 is a hydraulic excavator 200 in this embodiment. In the following description, unless otherwise specified, “front side”, “rear side”, “left side”, and “right side” are the front side, the rear side, the left side, and the left side as viewed from the driver seat of the excavator 200, respectively. Means the right side.

  The hydraulic excavator 200 includes a crawler type lower traveling body 1 and an upper revolving body 2 supported on the lower traveling body 1 so as to be capable of swiveling. A work machine 3 for performing excavation work or the like is provided at the front end of the upper swing body 2 so as to be raised and lowered. The work machine 3 includes a boom 4 whose base end is rotatably attached to the upper frame 10, an arm 5 rotatably attached to the distal end side of the boom 4, and a pivot to the distal end side of the arm 5. The boom 4, the arm 5, and the bucket 6 having the bucket 6 that can be attached are driven by a boom cylinder 7, an arm cylinder 8, and a bucket cylinder 9, which are hydraulic cylinders, respectively.

  The upper swing body 2 is attached to the upper frame 10 serving as the skeleton base, the working machine 3 attached to the front end portion of the central portion of the upper frame 10, and the rear end side of the upper frame 10. A counterweight 11 for balancing, an engine and a hydraulic pump (not shown) provided on the front side of the counterweight 11 in the upper frame 10, and a cab 12 disposed on the left side of the front portion of the upper frame 10. Yes.

  As shown in FIGS. 2 to 4, the upper frame 10 includes a center section 20 located at the center of the excavator 200 in the width direction (left and right direction), and left and right decks connected to the left and right sides of the center section 20. It has a deck structure composed of parts 21 and 22. The center section 20 includes a bottom plate 28 and left and right vertical plates 24 and 25 which are provided on the bottom plate 28 and extend substantially in the front-rear direction. The work machine 3 is attached to the front end portion of the center section 20 as described later.

<Detailed configuration of left and right decks>
The front ends of the left and right deck portions 21 and 22 are at the same position in the front-rear direction, while the front end of the center section 20 is positioned in front of the front ends of the left and right deck portions 21 and 22. The left deck portion 21 and the right deck portion 22 are respectively a left side frame 26 and a right side frame 27 having a D-shaped cross section extending in the front-rear direction, and a left connecting member 30 that connects the side frames 26 and 27 to the center section 20. And a right connecting member 40.

  The right connecting member 40 extends from the front portion of the right vertical plate 25 toward the right side (outside in the left-right direction of the center section 20) and has a right front frame 41 having a D-shaped cross section connected to the front end portion of the right side frame 27. And a flat right rear frame 44 extending from the rear end portion of the right vertical plate 25 toward the right side and connected to the rear end portion of the right side frame 27, and the right side from the middle portion of the right vertical plate 25 in the front-rear direction. And first and second right overhanging beams 42 and 43 extending toward.

  The two right projecting beams 42 and 43 are arranged at intervals in the front-rear direction, and are used as pedestals for arranging the devices of the excavator 200.

  Specifically, the first right extending beam 42 has a horizontal plate portion 42a extending in the horizontal direction and the vertical direction, and a vertical plate portion 42b extending downward along the rear edge of the horizontal plate portion 42a. The cross section is substantially L-shaped. However, the cross section of the connecting portion of the first right extending beam 42 with the right side frame 27 is formed in a U-shape that opens downward. The horizontal plate portion 42a supports the front end portion of the fuel tank and the control valve 50 (see FIG. 3). Similarly, the second right extending beam 43 has a horizontal plate portion 43a that supports the rear end portion of the fuel tank, and a vertical plate portion 43b that extends downward along the front end edge of the horizontal plate portion 43a. It is formed in a substantially L-shaped cross section when viewed from the left-right direction.

  The left connecting member 30 extends from the front portion of the left vertical plate 24 toward the left side (outside in the left-right direction of the center section 20) and has a left front frame 31 having a D-shaped cross section connected to the front end portion of the left side frame 26. A flat left rear frame 35 extending from the rear end portion of the left vertical plate 24 toward the left side and connected to the rear end portion of the left side frame 26, and a left side from an intermediate portion in the front-rear direction of the left vertical plate 24. And first to third left projecting beams 32 to 34 extending toward the front. The three left projecting beams 32 to 34 are spaced apart from each other in the front-rear direction. The first to third left projecting beams 32 to 34 are all plate-like beams that are perpendicular to the bottom plate 28 and extend in the left-right direction. A cab support portion 95 to be described later is provided at the left end of the second left overhanging beam 32 and the third third left overhanging beam 34 from the front.

<Detailed configuration of center section>
The center section 20 includes the bottom plate 28 and the left and right vertical plates 24 and 25 as described above. The bottom plate 28 is formed of a thick steel plate, and the left and right vertical plates 24 and 25 are joined to the bottom plate 28 by welding or the like.

  As shown in FIG. 4, the bottom plate 28 has a substantially rectangular plate-like bottom plate main body 51 that is long in the front-rear direction, and an extending portion 52 that extends forward from a portion on the right side of the front end portion of the bottom plate main body 51. ing. The extending part 52 is formed in a substantially rectangular plate shape, and its root part is widened in the left-right direction toward the rear side (bottom plate main body 51 side). Thereby, the bending rigidity in the boundary part of the baseplate main body 51 and the extension part 52 is improved.

  An annular bearing fixing portion 61 for fixing the swivel bearing is formed on the lower surface of the front end portion of the bottom plate main body 51. The bearing fixing portion 61 is formed with a plurality of screw holes 62 for fixing the outer ring of the swing bearing. A motor attachment hole 63 for attaching a turning motor is formed at a position inscribed in the bearing fixing portion 61 at the front end portion of the bottom plate main body 51. A pinion gear is attached to the turning motor so as to rotate together. The pinion gear rotates while meshing with an inner peripheral gear provided on the inner ring of the bearing, so that the upper frame 10 turns with respect to the lower traveling body 1. In addition, the code | symbol 64 in FIG. 4 is an attachment hole for attaching a swivel joint.

  A beam plate 65 extending in the left-right direction is erected in the vicinity of a position directly above the front end of the bearing fixing portion 61 in the bottom plate main body 51. The upper end portion of the beam plate 65 is welded and joined to the lower surface of a back plate 70 described later, and the lower end portion of the beam plate 65 is welded and joined to the upper surface of the bottom plate 28. The left and right end edges of the beam plate 65 are welded to the left and right vertical plates 24 and 25, respectively.

  The left and right vertical plates 24 and 25 extend from the front end portions of the vertical plate main body portions 24b and 25b located between the left and right side frames 26 and 27 and the vertical plate main body portions 24b and 25b to the left and right, respectively. Projecting vertical plate portions 24a and 25a projecting forward from the front end portions (left and right deck portions 21 and 22) of the side frames 26 and 27 are provided. In the present embodiment, the left and right vertical plates 24 and 25 are each formed as a single plate. For example, the vertical plate main body portions 24b and 25b and the protruding vertical plate portions 24a and 25a are formed by welding. It may be.

  As shown in FIGS. 5 and 6, the protruding vertical plate portions 24 a and 25 a of the left and right vertical plates 24 and 25 protrude upward in a substantially trapezoidal shape in a side view. The upper end edges of the left and right protruding vertical plate portions 24a and 25a are continuously connected to the upper end edges of the vertical plate main body portions 24b and 25b, respectively, in a side view. The upper end edges of the left and right protruding vertical plate portions 24a and 25a extend from the front end portion of the vertical plate main body portions 24b and 25b to the front diagonally upper side, then extend horizontally toward the front side, and then extend to the front diagonally lower side. It reaches the front end edges of the protruding vertical plate portions 24a and 25a.

  A work implement mounting plate 71 for attaching the boom 4 and the boom cylinder 7 of the work implement 3 is provided between the left and right protruding vertical plate portions 24a and 25a. The work implement 3 is fixed to the left and right protruding vertical plate portions 24a and 25a via the work implement mounting plate 81. Thus, the left and right projecting vertical plate portions 24 a and 25 a constitute a work implement mounting portion for mounting the work implement 3.

  The left and right end edges of the work implement mounting plate 71 are welded and fixed to the left and right protruding vertical plate portions 24a and 25a, respectively. The work machine mounting plate 71 extends vertically upward from the upper end of the vertical plate 72 and a vertical plate 72 extending perpendicularly to the bottom plate 28 along the front end edges of the left and right protruding vertical plates 24a and 25a. And an inclined plate portion 73.

  A pair of cylinder bracket plates 74 arranged in the left-right direction is erected on the vertical plate portion 72. Each cylinder bracket plate 74 is formed with a through hole 75 penetrating in the left-right direction. The base end portion of the boom cylinder 7 is rotatably supported by a cylinder support pin (not shown) fitted and supported in the through hole 75. The inclined plate portion 73 is provided with a pair of triangular bracket-shaped boom bracket plates 78 arranged in the left-right direction. Each boom bracket plate 78 is superposed in the thickness direction (left-right direction) and joined to the protruding vertical plate portions 24a, 25a of the left and right vertical plates 24, 25. The protruding vertical plate portions 24a and 25a and the boom bracket plate 78 are formed with through holes 79 penetrating in the left-right direction. The base end portion of the boom 4 is rotatably supported by a boom support pin (not shown) fitted and supported in the through hole 79.

  Returning to FIG. 3, the left and right protruding vertical plate portions 24 a and 25 a are erected on the extending portion 52 of the bottom plate 28. Both protruding vertical plate portions 24a and 25a extend in the front-rear direction and are arranged in parallel with a space in the left-right direction.

  The vertical plate main body portions 24 b and 25 b of the left and right vertical plates 24 and 25 are erected on the bottom plate main body 51. The vertical plate main body portion 24b of the left vertical plate 24 extends in a straight line from the rear end of the bottom plate main body 51 toward the front side in a plan view, and extends diagonally forward from the front end portion of the straight portion 24f. And an inclined portion 24g connected to the rear end of the protruding vertical plate portion 24a of the left vertical plate 24. Similarly, the vertical plate main body portion 25b of the right vertical plate 25 includes a straight portion 25f extending linearly from the rear end of the bottom plate main body 51 toward the front side, and a diagonally left front side from the front end portion of the straight portion 25f in plan view. And an inclined portion 25g connected to the rear end of the protruding vertical plate portion 25a of the right vertical plate 25. The left and right vertical plates 24 and 25 have the inclined portions 24g and 25g as described above, but extend in the front-rear direction when viewed as a whole.

  The rear end portions of the left and right vertical plate main body portions 24b and 25b are connected to each other by a flat plate-shaped central rear frame 93 that stands on the upper surface of the bottom plate 28 and extends in the left-right direction. Further, the middle portions in the front-rear direction of the left and right vertical plate main body portions 24 b and 25 b are connected to each other by first and second connecting plates 91 and 92 erected on the upper surface of the bottom plate 28. The connecting plates 91 and 92 are disposed at a predetermined interval in the front-rear direction. A hydraulic oil tank support portion 94 for supporting the hydraulic oil tank 150 is provided at the right end portions of the first and second connecting plates 91 and 92, respectively. Further, a cab support portion 95 described later is provided on the left side of the hydraulic oil tank support portion 94 in the second connecting plate 92.

  As shown in FIGS. 5 and 6, the heights of the left and right vertical plate main body portions 24 b and 25 b are generally lower at the rear side portion than at the front side portion. And the height of each vertical board main-body part 24b, 25b is lower than the height of the side frames 26 and 27 over the whole front-back direction. In other words, the upper end edges of the left and right vertical plate main body portions 24b, 25b are located below the upper end surfaces of the side frames 26, 27 at any position in the front-rear direction in a side view. In the present specification, the term “height” means a height based on the upper surface of the bottom plate 28 unless otherwise specified.

  A back plate 70 is provided at the boundary between the protruding vertical plate portions 24a and 25a of the left and right vertical plates 24 and 25 and the vertical plate main body portions 24b and 25b so as to cover the upper side thereof. The back plate 70 is disposed across the left and right vertical plates 24 and 25, and is welded to the vertical plates 24 and 25 (see FIGS. 2 and 3). The back plate 70 is formed in a divergent shape that widens from side to side in the plan view. It can also be said that the back plate 70 is formed in a substantially Y shape in which the rear side extends left and right in plan view. Specifically, the back plate 70 is disposed across the rear ends of the left and right protruding vertical plate portions 24a and 25a, and a main body inclined portion 82 that is inclined downward toward the rear side. It has a left branch portion 83 that branches from the lower end portion and extends along the left vertical plate main body portion 24b, and a right branch portion 84 that extends along the right vertical plate main body portion 25b. The main body inclined portion 82 is formed with a through hole 82 f for guiding the hydraulic hose 151 connected to the control valve 50 mounted on the deck portions 21 and 22 to the cylinders 7 to 9 of the work machine 3. . The left and right branch portions 83 and 84 of the back plate 70 are welded to the vertical plates 24 and 25 in an I-shaped cross section so as to cover the upper sides of the left and right vertical plates 24 and 25.

<Configuration of cab support section>
As shown in FIG. 7, the cab 12 is formed as a vertically long box-like body having a floor plate 12a (see FIG. 8). Although not shown, a cab 12 is provided with a driver's seat, an operating lever, and the like on which an operator sits. The upper frame 10 is provided with five cab support portions 95 for supporting the floor plate 12 a of the cab 12, three on the left deck portion 21 and two on the center section 20.

  Specifically, the three cab support portions 95a to 95c provided in the left deck portion 21 are fixed to the side surface of the left side frame 26 in the left-right direction (center section side) (see FIG. 2). The three cab support portions 95a to 95c are arranged at predetermined intervals in the front-rear direction. The first support portion 95a and the rearmost support portion 95c from the front extend upward from the block plate-like pedestal portions 101a and 101c contacting the floor plate 12a of the cab 12 and the inner side surface of the left side frame 26. Leg portions 102a and 102c for supporting the pedestal portions 101a and 101c are provided. The middle support portion 95 b has a pedestal portion 101 b that abuts a boss seat (not shown) protruding from the floor plate 12 a of the cab 12, and this pedestal portion 101 b is fixed to the left end portion of the third left extending beam 33. ing.

  The two cab support portions 95d and 95e provided on the right deck portion 22 are arranged at a predetermined interval in the front-rear direction. Of these, the front cab support portion 95 d is fixed to the upper surface of the back plate 70. The cab support portion 95d has a leg portion 102d formed in a U shape when viewed from the left-right direction, and a pedestal portion 101d fixed to the upper surface of the leg portion 102d. Further, the rear cab support portion 95e is fixed to a second connecting plate 92 provided between the left and right vertical plate main body portions 24b and 25b. The cab support portion 95e includes a square pedestal portion 101e, and a leg plate 102e that extends diagonally forward from the front side surface of the second connecting plate 92 and is connected to the lower surface of the pedestal portion 101e. The pedestal portions 101d and 101e of the two cab support portions 95d and 95e are in contact with the floor plate 12a of the cab 12.

  The cab 12 is fixed with bolts to the base portions 101a to 101e of the five cab support portions 95a to 95e. Of the five pedestals 101a to 101e, the seats of the four pedestals 101a, 101c, 101d, and 101e that are in contact with the floor plate 12a of the cab 12 are located slightly above the upper surfaces of the left and right side frames 26 and 27. Yes. Between the extension surface P1 of the seat surface and the upper edge of the left and right vertical plates 24 and 25, a hydraulic hose extending from the device (for example, the control valve 50) mounted on the right deck portion 22 into the center section 20 In addition, a gap space S1 into which electric wiring can be inserted is formed.

  As described above, in the above-described embodiment, the left and right vertical plates 24 and 25 protrude to the front side from the front end portions of the left and right side frames 26 and 27, and the projecting vertical plate portions 24a and 25a to which the work implement 3 is attached, It has the vertical board main-body parts 24b and 25b connected to the rear-end part of the protrusion vertical board parts 24a and 25a. The height of the vertical plates 24 and 25 with respect to the bottom plate 28 of the vertical plate main body portions 24b and 25b is set to be lower than the height of the left and right side frames 26 and 27 with reference to the bottom plate 28. .

  As a result, the working machine mounting portions of the vertical plates 24 and 25 that require a relatively large size in the vertical direction can be positioned on the front side of the left and right deck portions 21 and 22 as protruding vertical plate portions 24a and 25a. . Moreover, since the height of the vertical plate main body portions 24b and 25b of the vertical plates 24 and 25 is set lower than the height of the left and right side frames 26 and 27, it is a main skeleton member from the upper surface portion of the upper frame 10. The vertical plates 24 and 25 do not protrude upward. Therefore, the entire region R1 straddling the left and right deck portions 21 and 22 and the portion positioned therebetween can be used as a mounting region for equipment such as the cab 12 and the hydraulic oil tank.

  Therefore, since the cab 12 does not interfere with the vertical plates 24 and 25, the width of the cab 12 can be freely set without being restricted by the vertical plates 24 and 25. That is, in the conventional upper frame 10, in order to avoid interference between the cab 12 and the vertical plates 24 and 25, the width Wc of the cab 12 needs to be smaller than the width Wd of the left deck portion 21. In the embodiment, as shown in FIG. 7, the width Wc of the cab 12 can be made larger than the width Wd of the left deck portion 21.

  In addition, since the height of the vertical plate main body portions 24b and 25b of the vertical plates 24 and 25 is lower than the height of the left and right side frames 26 and 27, they are supported at a slightly higher position than the left and right side frames 26 and 27. Between the cab 12 and the vertical plate main body portions 24b and 25b, a clearance space S1 for inserting electrical wiring and hydraulic hose piping of devices mounted on the deck portions 21 and 22 can be secured (FIG. 8). reference). Therefore, compared to the conventional upper frame 10 in which the through holes for wiring are formed in the vertical plates 24 and 25, when assembling the excavator 200, wiring and piping can be easily routed. it can. In particular, a large number of hydraulic hoses 151 extending from the control valve 50 mounted on the right deck portion 22 are mounted on the rear end portion of the center section 20 through the gap space S1 between the right vertical plate 25 and the cab 12. It can be easily routed toward the work implement 3 attached to the pump and the front end. Further, since it is not necessary to form through holes for wiring in the vertical plates 24 and 25, it is possible to prevent the strength and rigidity of the vertical plates 24 and 25 from being lowered.

  Further, in the above embodiment, the left and right vertical plates 24 and 25 are connected to the boundary B1 between the vertical plate main body portions 24b and 25b and the protruding vertical plate portions 24a and 25a across the left and right vertical plates 24 and 25. A back plate 70 is provided. Therefore, the swing of the upper frame 10 caused by the vertical movement of the work implement 3 can be reduced, and sufficient strength can be secured against the reaction force during excavation work.

  That is, in the upper frame 10 according to the above-described embodiment, the work implement mounting portion provided at the front end portions of the left and right vertical plates 24 and 25 protrudes to the front side from the left and right side frames 26 and 27, so that the work implement is mounted. The strength of the base portion of the portion, that is, the strength of the boundary portion B1 between the vertical plate main body portions 24b and 25b and the protruding vertical plate portions 24a and 25a is lower than the conventional one.

  On the other hand, in the above-described embodiment, the back plate 70 is provided at the boundary between the vertical plate main body portions 24b and 25b of the left and right vertical plates 24 and 25 and the protruding vertical plate portions 24a and 25a. , 25 are connected by a back plate, the bending rigidity (strength) in the vertical direction of the upper frame 10 with the boundary B1 as a fulcrum can be improved. Therefore, the bending deformation of the upper frame 10 accompanying the vertical movement of the work machine 3 or excavation work can be reliably suppressed.

  Further, the left and right branch portions 83 and 84 of the back plate 70 are welded to the vertical plates 24 and 25 in an I-shaped cross section so as to cover the upper sides of the left and right vertical plates 24 and 25. A structure strong against bending in the vertical direction can be obtained by increasing the distance between the back plate 70 and the neutral surface.

  Further, since the through hole 82f through which the hydraulic hose 151 can be inserted is formed in the back plate 70, the routing property of the hydraulic hose 151 from the right deck portion 22 toward the work implement 3 even when the back plate 70 is provided. Will not get worse.

Furthermore, in the above-described embodiment, the beam plate 65 extending in the left-right direction is erected on a portion of the upper surface of the bottom plate main body 51 that is positioned substantially directly above the front end portion of the bearing fixing portion 61. Accordingly, the bending rigidity in the vertical direction with the vicinity of the front end portion of the bearing fixing portion 61 of the bottom plate body 51 as a fulcrum is improved, and the bending deformation of the upper frame 10 accompanying the vertical movement of the work machine 3 and excavation work is further ensured. Can be suppressed.
(Other embodiments)
The configuration of the present invention is not limited to the above embodiment, but includes various other configurations.

  That is, in the above embodiment, the seat surface of each cab support portion 95 is located slightly above the upper surfaces of the left and right side frames 26 and 27, but is not limited to this, and the left and right side frames 26. , 27 may be located at the same height as the upper surface of.

  In the above embodiment, the cab 12 is disposed on the left side of the front portion of the upper frame 10, but is not limited to this. For example, the cab 12 is disposed on the left side of the upper frame 10 or the right side of the front portion. You may make it do.

  In the above-described embodiment, the fuel tank and the control valve 50, which are main devices, are mounted on the right deck portion 22, but the arrangement configuration of these devices is an example. May be mounted on the left deck portion 21, or only the fuel tank may be mounted on the left deck portion 21.

  In the above embodiment, the construction machine 100 is a hydraulic excavator. However, the construction machine 100 is not limited to this. For example, it may be a hybrid excavator that uses both an electric motor and a hydraulic motor. Nor.

  Moreover, in the said embodiment, although the height of the vertical board main-body parts 24b and 25b is lower than the height of the side frames 26 and 27, it is not restricted to this and is equivalent to the side frames 26 and 27. It may be height. Moreover, in the said embodiment, although the height of the vertical board main-body parts 24b and 25b is lower than the height of the side frames 26 and 27 over the whole front-back direction, it is not restricted to this, For example, the height of the vertical plate main body portions 24b and 25b may be set lower than the height of the side frames 26 and 27 only in the cab 12 mounting area. That is, the height of the vertical plate main body portions 24b and 25b may be equal to or lower than the height of the side frames 26 and 27 at least in the mounting region of the cab 12.

  The present invention is useful for an upper frame of a construction machine, and particularly useful for an upper frame having a deck structure in which deck portions are disposed on both sides of a center section.

P1 Extension surface of seating surface S1 Crevice space
3 working machines
9 Cab support part
10 Upper frame
12 Cab
20 Center section
21 Left deck
22 Right deck
24 Left vertical plate 24a Projecting vertical plate
24b Vertical plate body 25 Right vertical plate 25a Protruding vertical plate 25b Vertical plate body
26 Left side frame
27 Right side frame
28 Bottom plate 30 Left connecting member 40 Right connecting member 50 Control valve (equipment)
51 Bottom plate body
52 Extension
61 Bearing fixing part
70 Backboard
71 Work machine mounting plate
82f Through hole
95 Cab support
100 Construction machine 101a Pedestal part 101c Pedestal part 101d Pedestal part 101e Pedestal part 151 Hydraulic hose 200 Hydraulic excavator (construction machine)

Claims (6)

A center section having a bottom plate and left and right vertical plates standing on the bottom plate and extending in the front-rear direction, provided on each of the left and right sides of the center section and extending in the front-rear direction, and connecting the side frame to the center section An upper frame of a construction machine, comprising: a left and right deck portion having a connecting member; and a work machine mounting portion for mounting a work machine on a front end portion of the left and right vertical plates,
Each of the vertical plates extends from the front end of the vertical plate main body portion between the left and right side frames to the front side of the vertical plate main body portion and protrudes to the front side of the front end portions of the side frames of the deck portions. And having a protruding portion provided with the work implement mounting portion,
The height of each of the vertical plate main body portions with reference to the bottom plate is at least equal to or lower than the height of the left and right side frames with reference to the bottom plate in the cab mounting region. The upper frame of construction machinery. The upper frame of the construction machine according to claim 1,
At least one of the left and right vertical plates is provided with a cab support portion for supporting the cab,
The cab support portion is provided with a pedestal portion that abuts and supports the floor surface of the cab,
The height of each vertical plate main body with respect to the bottom plate is lower than the height with respect to the bottom plate of the seating surface of the pedestal at least in the cab mounting region. flame. In the upper frame of the construction machine according to claim 1 or 2,
On at least one of the left and right deck parts, equipment necessary for the operation of the construction machine is mounted,
A gap space is formed between the upper edge of each of the vertical plate main body portions and the extended surface of the seating surface of the pedestal portion so as to allow passage of electrical wiring or hydraulic piping extending from the device into the center section. An upper frame for construction machinery. In the upper frame of the construction machine according to any one of claims 1 to 3,
The upper frame of a construction machine, wherein a back plate connected across the left and right vertical plates is provided at a boundary portion between the vertical plate main body portion and the protruding portion of the left and right vertical plates. The upper frame of the construction machine according to claim 4,
The upper frame of a construction machine, wherein the back plate is formed with a hole through which the electric wiring or piping arranged in the center section can be inserted. In the upper frame of the construction machine according to claim 5,
The upper frame is supported so as to be pivotable via a bearing with respect to the lower traveling body of the construction machine,
The lower surface of the bottom plate of the center section is provided with a bearing fixing portion to which the slewing bearing is fixed,
An upper frame of a construction machine, wherein a beam plate extending in the left-right direction is provided upright at a portion of the upper surface of the bottom plate that is positioned substantially directly above the front end portion of the bearing fixing portion.

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