JP2013083091A - Upper frame of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an upper frame 10 of a hydraulic shovel 200 with a center section 20 and deck parts 21, 22 connected to the right and left sides thereof, which improves the routing performance of hydraulic hose piping 151 from devices (control valve 50 or the like) mounted on the deck parts 21, 22 while strength of the upper frame 10 is fully secured.SOLUTION: A first right projecting beam 42 for connecting right and left side frames 26, 27 with a center section 20 is used as a pedestal beam 42 which is a pedestal part of a control valve 50. The pedestal beam 42 is formed in L-shaped cross-section as viewed in right and left direction. Furthermore, in order to secure a connection strength between the pedestal beam 42 and a vertical plate 25, a reinforcing horizontal rib 179 is provided at an end of the center section side of a vertical plate part 171 of the pedestal beam 42.

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).

  In this structure, each of the left and right deck portions has a side frame extending in the front-rear direction and a connecting member for connecting the side frame to the center section. Equipment such as a hydraulic pump, a hydraulic oil tank, and a control valve is disposed on the right deck portion, and a cab that forms a driver's cab is disposed on the other deck portion.

  The connecting member of the right deck portion includes a pair of front and rear side beams used as a pedestal portion of the control valve. Each of the pair of side beams is formed in a U-shaped cross section that opens downward. A base plate straddling both sides is installed on the upper surfaces of both side beams, and a control valve is fixed to the base plate.

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

JP 2006-193949 A Patent No. 4740088

  However, in the construction machine having the upper frame shown in Patent Document 1, fixed piping (bending piping of a hydraulic pump in Patent Document 1) and a hydraulic oil tank are arranged narrowly around the control valve. There is a problem that it is difficult to secure a space for wiring the hydraulic hose around the control valve. In particular, in a small construction machine having a weight of 13 t or less, the right and left width and the front and rear length of the deck portion are shorter than in a large construction machine, and this problem becomes significant.

  Further, in the conventional upper frame, since it is necessary to form a through hole for inserting a hydraulic hose pipe or the like in the vertical plate, the strength of the vertical plate is lowered, and consequently the strength of the entire upper frame is lowered. There is a problem.

  The present invention has been made in view of such a point, and the object of the present invention is to sufficiently secure the strength of the upper frame by devising the configuration of the upper frame having the deck structure. However, there is an attempt to improve the wiring performance of the electrical wiring and hydraulic hose piping extending from the equipment mounted on the deck portion.

  In order to achieve the above object, according to the present invention, a connecting beam for connecting the left and right side frames and the center section is used as a pedestal beam serving as a pedestal part of the device, and the pedestal beam is used in the horizontal direction. And a reinforcing lateral rib is provided at the center section side end of the vertical plate portion of the pedestal beam having the L-shaped cross section.

  Specifically, in the first aspect of the present invention, 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, and left and right left and right sides of the center section extending in the front-rear direction are provided. An upper frame of a construction machine comprising a side frame and left and right connecting members that protrude from the side surfaces of the left and right vertical plates to the left and right sides of the center section and are connected to the left and right side frames. set to target.

  At least one of the left and right connecting members includes a pedestal beam used as a pedestal part of the equipment of the construction machine, and the pedestal beam is disposed in parallel to the bottom plate and is laterally A horizontal plate portion for mounting the device and a vertical plate portion extending downward along the front edge or the rear edge of the horizontal plate portion, and the cross section viewed from the left-right direction is L-shaped. The vertical plate portion of the pedestal beam is formed such that an end on the center section side in the left-right direction is connected to a vertical plate, and an end opposite to the center section side is connected to a side frame. On the other hand, the horizontal plate portion has an end portion on the side of the center section in the left-right direction that is not connected to the vertical plate, and an end portion on the opposite side to the center section side is connected to the side frame, Left and right side of the vertical plate At the end of the center section side, it is assumed that the reinforcing transverse ribs connecting the side surfaces and vertical plate of the vertical plate portion is provided.

  According to this configuration, the pedestal beam is formed in an L-shaped cross section when viewed from the left-right direction, so that the space below the pedestal beam can be connected to electrical wiring and hydraulic hose piping from equipment installed on the pedestal It can be used as a routing space.

  This hydraulic hose piping and electrical wiring are usually connected to various actuators etc. via the center section, but in order to guide these hose piping etc. into the center section, for example, the height of the vertical plate is made as much as possible. It is conceivable to arrange hose piping or the like so as to be set low and straddle the upper side of the vertical plate.

  In such a case, the height of the vertical plate becomes lower than the height position of the horizontal plate portion, and the end of the horizontal plate portion on the center section side and the vertical plate may not be connected. There is a problem that the connection strength of the lowering.

  On the other hand, in the present invention, the vertical plate portion and the vertical plate are connected to each other by providing the reinforcing horizontal rib at the end of the vertical plate portion on the center section side as compared with the case where the reinforcing horizontal rib is not provided. Increased strength. As a result, the height of the vertical plate can be kept as low as possible, and the connection strength between the pedestal beam and the vertical plate can be sufficiently secured while securing the passage space for the electrical wiring and the hose pipe on the upper side.

  According to a second aspect of the present invention, in the first aspect of the invention, each of the vertical plates includes a vertical plate main body portion positioned between the left and right side frames, and a front end portion of the vertical plate main body portion extending forward. And a projecting portion provided with the work implement mounting portion, and having a height relative to the bottom plate of the vertical plate main body portion as H1. When the height of the left and right side frames with respect to the bottom plate is H2, and the height of the horizontal plate portion from the bottom plate is Hs, the relationship of H1 <Hs <H2 is satisfied, The vertical plate portion of the pedestal beam is connected to the vertical plate main body portion at the center section side end in the left-right direction and connected to the side frame at the end opposite to the center section side. The horizontal plate part End of the coater section side is a non-connected to the longitudinal plate body portion, and the center section side shall end opposite are connected to the side frame.

  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. Moreover, since the height H1 of the vertical plate main body is set lower than the height H2 of the left and right side frames, the vertical plate as the main skeleton member does not protrude upward from the upper surface of the upper frame. . Therefore, the entire area spanning the left and right deck parts and the part located therebetween can be used as a cab or equipment mounting area. Therefore, since the cab does not interfere with the vertical plate, the width of the cab can be freely set without being restricted by the vertical plate.

  In addition, the cab is usually supported at the same height as the upper surfaces of the left and right side frames or slightly higher than the upper frame, but as described above, the height of the vertical plate body is set to the side frame. By setting the height lower than the height, it is possible to secure a gap space for inserting electric wiring and hydraulic piping between the upper edge of the vertical plate and the lower surface of the cab.

  Here, in order to improve the wiring property of these electric wiring and hydraulic piping, it is preferable to set the height of the vertical plate main body portion as low as possible so as to widen the gap space in the vertical direction. In such a case, the height of the vertical plate body is lower than the height position of the horizontal plate of the pedestal beam, and the center section side end of the horizontal plate cannot be connected to the vertical plate (vertical plate body). There is. As a result, there arises a problem that the connection strength between the pedestal beam and the vertical plate is lowered, the support strength of the equipment by the pedestal beam is lowered, and the connection strength of the entire deck portion with respect to the center section is lowered.

  On the other hand, in the present invention, since the reinforcing horizontal rib is provided at the end on the center section side of the vertical plate portion of the pedestal beam, the horizontal plate portion cannot be connected to the vertical plate in this way. Even if it exists, the connection strength of the beam for bases and a vertical board can fully be ensured. Therefore, it is possible to improve the wiring property of the electrical wiring and the hydraulic hose piping of the equipment in which the pedestal beam is installed while sufficiently securing the strength of the pedestal beam.

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

  According to a third aspect of the present invention, in the first or second aspect of the invention, a notch portion that is recessed downward is formed at an upper end edge of the end portion on the center section side in the left-right direction of the vertical plate portion. The width of the rib in the left-right direction is greater than the width of the notch in the left-right direction.

  According to this configuration, since the notch is formed at the end of the vertical plate portion on the side of the connecting portion with the vertical plate, the wiring and piping of the equipment interfere with the end of the vertical plate portion. Can be avoided. Further, since the width of the reinforcing lateral rib is set larger than the width of the cutout portion, it is possible to suppress a decrease in strength of the pedestal beam due to the provision of the cutout portion.

  According to a fourth aspect of the present invention, the horizontal plate portion is formed so that the width in the front-rear direction becomes narrower from the connecting portion side to the side frame toward the center section side.

  According to this configuration, it is possible to improve the wiring property of the electrical wiring from the device and the hydraulic hose piping while sufficiently securing the device installation area of the pedestal beam.

  That is, most of the electrical wiring and hydraulic hose piping of the equipment installed on the pedestal beam is once guided to the center section and then routed toward the work machine and the engine. For this reason, in the vicinity of the end of the pedestal beam on the center section side, a large number of wirings and pipes from the equipment installed on the pedestal beam to the center section are densely packed. For this reason, it is necessary to make a space for routing these wirings and pipes wider on the center section side of the pedestal beam than on the side frame side.

  On the other hand, in the invention of claim 4, the width in the front-rear direction of the horizontal plate portion is set so as to become narrower from the side frame side toward the center section side. This facilitates access to the lower space of the horizontal plate part from the upper surface side of the horizontal plate part toward the center section side of the horizontal plate part, and expands the wiring space (routing flexibility) of wiring and piping. can do.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the pedestal beam extends downward from a lower surface of the horizontal plate portion and is connected to a side surface of the vertical plate portion. A rib is further provided.

  According to this configuration, the lower surface of the horizontal plate portion on which the device is placed can be supported by the reinforcing vertical rib connected to the side surface of the vertical plate portion. Therefore, the support strength of the apparatus by the pedestal beam can be further improved.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the pedestal beam is a side where the vertical plate portion is located at an end of the horizontal plate portion on the side of the connecting portion with the side frame. It further includes a vertical piece that extends downward from the opposite edge to the vertical piece, and the vertical piece is connected to the side frame.

  According to this configuration, the pedestal beam can be formed in a U-shaped cross section that opens downward when viewed from the left-right direction at the end on the side of the connecting portion with the side frame. Since the entire U-shaped cross section is connected to the side frame, the connection strength between the pedestal beam and the side frame can be improved as much as possible.

  As described above, according to the upper frame of the construction machine of the present invention, the connection beam for connecting the left and right side frames and the center section is used as a pedestal beam serving as a pedestal part of the equipment. The beam was formed to have a L-shaped cross section when viewed from the left-right direction, and reinforcing ribs were provided at the center section side end of the vertical plate portion of the pedestal beam having the L-shaped cross section. Thereby, the wiring property of the electrical wiring from an apparatus and hydraulic hose piping can be improved, ensuring sufficient connection strength of the beam for bases, and a vertical board.

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. It is the perspective view seen from the front upper side which shows the state which attached the fuel tank, the hydraulic oil tank, and the control valve to the upper frame. It is the perspective view seen from the upper left side which expands and shows a 1st right extension beam. It is the perspective view seen from the left front which expands and shows the 1st right extension beam. It is the perspective view seen from the front right side and upper direction which expands and shows a 1st right extension beam. (A) is the sectional view on the AA line of FIG. 12, (b) is the sectional view on the BB line of FIG. 12, (c) is the sectional view on the CC line of FIG. ) Is a sectional view taken along the line DD 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. In this embodiment, the 1st and 2nd right extension beams 42 and 43 are utilized as a base part of the fuel tank 36 arrange | positioned ranging over both the beams 42 and 43 (refer FIG. 9). Further, the first right extending beam 42 is also used as a pedestal portion of the control valve 50 disposed on the front side of the fuel tank 36. A hydraulic oil tank 37 is disposed on the diagonally left rear side of the fuel tank 36. The hydraulic oil tank 37 is supported by a hydraulic oil tank support portion 94 described later provided in the center section 20.

  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 on the left end of the second left overhanging beam 33 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 25b via the work implement mounting plate 71. 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 embodiment, the left and right side frames 26 and 27 have the same height. 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 through holes 82 f for guiding the hydraulic hose pipes 151 connected to the control valves 50 mounted on the deck portions 21 and 22 to the cylinders 7 to 9 of the work machine 3. Yes. 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 second left extending beam 33. ing.

  The two cab support portions 95d and 95e provided in the center section 20 are disposed 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.

<Support structure for hydraulic excavator equipment>
Next, a support structure for the fuel tank 36, the hydraulic oil tank 37, and the control valve 50, which are devices mounted on the hydraulic excavator 200, will be described.

  As shown in FIG. 9, the hydraulic oil tank 37 is formed in a vertically long rectangular box shape and is disposed across a pair of front and rear hydraulic oil tank support portions 94 provided in the center section 20. .

  The fuel tank 36 is formed in a horizontally long rectangular box shape, and is disposed across the first and second right extending beams 42 and 43 provided in the right deck portion 22 as described above. The front end portion and the rear end portion of the fuel tank 36 are respectively fixed to the right extension beams 42 and 43 by fixing bolts 185 (only the fixing bolts at the front end portion are shown in FIG. 9).

  A control valve 50 is disposed on the front side of the fuel tank 36. The control valve 50 is fixed to the upper surface of the first right extending beam 42 via a fixing bracket 160. The fixing bracket 160 includes a trapezoidal fixing plate 161 fixed to the upper surface of the first right extending beam 42, and a valve mounting plate 162 extending upward along the rear end edge of the fixing plate 161.

  As shown in FIGS. 10 to 13, the first right extending beam 42 is disposed in parallel to the bottom plate 28 and extends in the left-right direction. And a vertical plate portion 171 extending downward along the edge. The first right extending beam 42 is formed such that a cross section viewed from the left and right direction is substantially L-shaped at an intermediate portion excluding both ends in the left and right direction.

  The vertical plate portion 171 of the first right extension beam 42 has a left end portion welded to the right side surface of the right vertical plate 25 and a right end portion welded to the left side surface of the right side frame 27. Further, the lower end portion of the vertical plate portion 171 and the right front frame 41 are connected via a floor plate 45.

  A notch 172 that is recessed downward is formed at the left end of the vertical plate portion 171. The upper edge of the vertical plate portion 171 includes a horizontal side portion 173 extending horizontally from the left side surface of the right side frame 27 to the left side, and an arc-shaped side whose height decreases from the left end portion of the horizontal side portion 173 toward the left side. It is comprised with the part 174 (refer FIG. 12). The arc-shaped side portion 174 forms the lower end edge of the cutout portion 172.

  The horizontal plate portion 170 of the first right extension beam 42 has a left end portion that is not connected to the right vertical plate 25, and a right end portion that is welded to the right side frame 27. When the height from the bottom plate 28 of the horizontal flat plate portion 170 is Hs, the height of the portion of the right vertical plate 25 to which the first right extending beam 42 is connected is H1, and the height of the right side frame 27 is H2. , H1 <Hs <H2 is satisfied. The horizontal flat plate portion 170 is formed in a trapezoidal shape whose width in the front-rear direction increases in the plan view from the left to the right. That is, the rear end edge of the horizontal plate portion 170 extends linearly in the left-right direction, while the front end edge of the horizontal plate portion 170 extends linearly from the side surface of the right side frame 27 toward the left side. 175, and an inclined side portion 176 that extends obliquely rearward from the left end portion of the linear side portion 175 toward the left side.

  The lower surface of the horizontal plate portion 170 is connected and supported to the front side surface of the vertical plate portion 171 by two triangular plate-shaped reinforcing vertical ribs 177 and 178 arranged in the left-right direction. Both reinforcing vertical ribs 177 and 178 are welded to both end portions in the left-right direction on the lower surface of the horizontal plate portion 170. The height and longitudinal width of the right reinforcing vertical rib 178 are larger than those of the left reinforcing vertical rib 177. A through hole 186 is formed on the left side of the reinforcing vertical rib 178 at the lower end of the vertical plate portion 171. The hydraulic hose piping from the hydraulic oil tank 37 is led to the control valve 50 through the through hole 186.

  A vertical piece 180 that faces the vertical plate 171 and extends downward is connected to the right end of the front edge of the horizontal plate 170. By providing this vertical piece 180, the cross section of the connecting portion (right end portion) of the first right extending beam 42 with the right side frame 27 becomes a U-shaped cross section that opens downward (FIG. 13A). )reference).

  The front side surface of the vertical plate portion 171 and the right side surface of the right vertical plate 25 are connected by a reinforcing lateral rib 179. The reinforcing lateral rib 179 is formed of a triangular plate material disposed in parallel to the horizontal plate portion 170. The reinforcing horizontal rib 179 is disposed below the horizontal plate portion 170 and near the lower side of the notch portion 172 of the vertical plate portion 171. The lateral width w1 of the reinforcing lateral rib 179 is larger than the lateral width w2 of the notch 172.

<Summary>
As described above, in the above embodiment, the right connecting member 40 that connects the right deck portion 22 of the upper frame 10 and the center section 20 has the first right extending beam 42 (pedestal beam used as a pedestal portion of the control valve 50). ) Is included. The first right extending beam 42 is disposed in parallel to the bottom plate 28 and extends in the left-right direction, and a horizontal plate portion 170 for mounting equipment, and downward along the rear edge of the horizontal plate portion 170. It has a vertical plate portion 171 that extends, and a cross section viewed from the left-right direction is formed in an L shape. The vertical plate portion 171 of the first right extending beam 42 has an end portion on the center section side (left end portion) connected to the vertical plate body portion 25b, and an end portion on the opposite side to the center section side (right end). Portion) is connected to the right side frame 27, while the horizontal plate portion 170 has an end portion (left end portion) on the center section side that is not connected to the vertical plate body portion 25b. The opposite end (right end) is connected to the right side frame 27. The end (left end) on the center section side of the vertical plate portion 171 and the right vertical plate 25 are disposed below the horizontal plate portion 170 and extend in parallel to the horizontal plate portion 170. The horizontal ribs 179 are connected.

  According to this configuration, the first right overhanging beam 42 is formed in an L-shaped cross section when viewed from the left-right direction, so that the lower space 190 of the first right overhanging beam 42 is formed on the upper surface of the first right overhanging beam 42. It can be used as a wiring space for hydraulic hose piping from the installed control valve 50 (see FIG. 9).

  Here, in the above embodiment, the height H1 of the vertical plate body 25b is set to be smaller than the height H2 of the left and right side frames 26, 27. Therefore, the vertical plates 24 and 25 as the main skeleton members do not protrude upward from the upper surface portion of the upper frame 10. Therefore, as shown in FIG. 7, 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 the cab 12 and devices (such as the control valve 50). . Accordingly, since the cab 12 does not interfere with the vertical plates 24 and 25, the width Wc of the cab 12 can be freely set without being restricted by the vertical plates 24 and 25.

  Further, since the height H1 of the vertical plate main body portions 24b, 25b of each vertical plate 24, 25 is lower than the height of the left and right side frames 26, 27, it is supported at a slightly higher position than the left and right side frames 26, 27. An insertion space S1 (see FIG. 8) for inserting the electrical wiring and hydraulic hose piping 151 of the devices mounted on the deck portions 21 and 22 is secured between the cab 12 and the vertical plate body portions 24b and 25b. can do. 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 hose pipes 151 extending from the control valve 50 mounted on the left deck portion 21 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 hydraulic pump or the work machine 3 attached to the front end.

  In order to improve the routing property of the hydraulic hose pipe 151, it is preferable to set the height H1 of the vertical plate main body portion 25b as low as possible so that the gap space S1 is wide in the vertical direction. The inventors set the height of the vertical plate body 25b as low as possible within a range in which the required strength of the center section 20 can be secured based on such a concept. As a result, in the above embodiment, the height H1 of the vertical plate body 25b is lower than the height position Hs of the horizontal plate 170 of the first right extending beam 42, and the left end of the horizontal plate 170 is moved to the right. The frame structure cannot be connected to the vertical plate 25.

  In such a frame structure, the left end portion of the horizontal plate portion 170 is not connected to the right vertical plate 25, and therefore, the first right extending beam 42 and the right vertical plate 25 (vertical plate main body portion 25b) are connected. There is a possibility that the connection strength is lowered. On the other hand, in the above embodiment, instead of connecting the left end portion of the horizontal plate portion 170 to the right vertical plate 25, a reinforcing horizontal rib 179 is provided at the left end portion of the vertical plate portion 171, and this reinforcing plate is used. The connection strength between the vertical plate portion 171 and the right vertical plate 25 is improved by the lateral rib 179. Thereby, the wiring property of the electrical wiring and the hydraulic hose pipe 151 can be improved while sufficiently securing the connection strength between the first right extending beam 42 and the right vertical plate 25.

  Moreover, in the said embodiment, the notch part 172 dented below is formed in the upper end edge in the left end part (end part by the side of the connection part with the right vertical board 25) of the vertical board part 171 of the 1st right extension beam 42. Is formed.

  Accordingly, it is possible to prevent the hydraulic hose pipe 151 and the upper edge of the vertical plate portion 171 from interfering with each other in the vicinity of the left end of the first right extending beam 42 where the hydraulic hose pipe 151 from the control valve 50 is densely packed. it can.

  Further, in the above embodiment, since the lateral width w1 of the reinforcing lateral rib 179 is set larger than the lateral width w2 of the notch 172, the notch 172 is provided in the vertical plate portion 171. It is possible to suppress a decrease in the strength of the first right extending beam 42 due to the above.

  Moreover, in the said embodiment, the horizontal board part 170 of the 1st right extension beam 42 is a front-back direction as it goes to the center section side from the connection part side with the right side frame 27 (from the right side to the left side). The width is formed to be narrow.

  This facilitates access from the upper surface side of the horizontal plate portion 170 to the lower space 190 of the horizontal plate portion 170 toward the center section side where a large number of hydraulic hose pipes 151 are densely packed. (Degree of freedom of routing) can be expanded.

  In the above embodiment, the first right extending beam 42 has reinforcing vertical ribs 177 and 178 that extend downward from the lower surface of the horizontal plate portion 170 and are connected to the front side surface of the vertical plate portion 171. Yes.

  Thereby, the support strength of the control valve 50 and the fuel tank 36 by the first right extending beam 42 can be further improved.

  Further, in the above embodiment, the first right extending beam 42 is opposite to the side where the vertical plate 171 is located at the end (right end) of the horizontal plate 170 on the side of the connecting portion with the right side frame 27. It further includes a vertical piece 180 extending downward from the side edge (front edge).

As a result, the first right extending beam 42 can be formed in a U-shaped cross section that opens downward when viewed from the left and right directions at the end of the connecting portion side (right side) with the right side frame 27 (see FIG. 13 (a) to (c)). Since the entire U-shaped cross section is welded to the right side frame 27, the connection strength between the first right extending beam 42 and the right side frame 27 can be improved as much as possible.
(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-described embodiment, the vertical plate portion 171 of the first right extending beam 42 is erected along the rear edge of the horizontal plate portion 170, but is not limited to this, and the horizontal plate portion 170 is not limited thereto. It may be erected along the front edge.

  Further, 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, 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, the hydraulic oil 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. These devices 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.

  The present invention is useful for an upper frame of a construction machine, and particularly useful for an upper frame of a hydraulic excavator.

H1 Vertical plate body height H2 Side frame height Hs Horizontal plate height from bottom plate w1 Reinforcement horizontal rib width w2 Notch width 3 Working machine
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 36 Fuel tank
37 Hydraulic oil tank
40 Right connecting member 42 First right extending beam (pedestal beam)
50 Control valve (equipment)
100 Construction machine 151 Hydraulic hose piping 170 Horizontal plate
171 Vertical plate
172 Notch
177 Vertical ribs for reinforcement
178 Vertical rib for reinforcement
179 Horizontal ribs for reinforcement
180 vertical piece
190 Lower space
200 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, left and right side frames provided on the left and right sides of the center section, extending in the front-rear direction, and side surfaces of the left and right vertical plates, respectively A left and right connecting member that protrudes outward in the left and right direction of the center section and is connected to the left and right side frames, and an upper frame of a construction machine,
At least one of the left and right connecting members includes a pedestal beam used as a pedestal part of the equipment of the construction machine,
The pedestal beam is disposed in parallel to the bottom plate and extends in the left-right direction, and a horizontal plate portion for mounting the device, and a vertical plate extending downward along the front edge or the rear edge of the horizontal plate portion. A section viewed from the left-right direction is formed in a substantially L shape,
The vertical plate portion of the pedestal beam is connected to the vertical plate at the center section side end in the left-right direction, while the end opposite to the center section side is connected to the side frame,
The horizontal plate has a left and right center section side end that is not connected to the vertical plate, and the end opposite to the center section is connected to the side frame,
An upper part of a construction machine, characterized in that a reinforcing lateral rib for connecting a side surface of the vertical plate portion and a side surface of the vertical plate is provided at an end portion of the vertical plate portion on the center section side in the left-right direction. flame. The upper frame of the construction machine according to claim 1,
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 the vertical plate body portion with respect to the bottom plate is H1, the height of the left and right side frames with respect to the bottom plate is H2, and the height of the horizontal plate portion from the bottom plate is Hs. When
The relationship of H1 <Hs <H2 is satisfied,
The vertical plate portion of the beam for the pedestal is connected to the vertical plate main body portion at the center section side end in the left-right direction, and is connected to the side frame at the end opposite to the center section side,
The horizontal plate has a center section side end in the left-right direction that is not connected to the vertical plate main body, and an end opposite to the center section is connected to the side frame. The upper frame of the construction machine. In the upper frame of the construction machine according to claim 1 or 2,
On the upper edge at the end on the side of the center section in the left-right direction of the vertical plate part, a notch that is recessed downward is formed,
The upper frame of a construction machine, wherein a width of the reinforcing lateral rib in the left-right direction is larger than a width in the left-right direction of the notch. 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 the horizontal plate portion is formed so that a width in a front-rear direction becomes narrower from a connecting portion side to the side frame toward a center section side. In the upper frame of the construction machine according to any one of claims 1 to 4,
The pedestal beam is
An upper frame for a construction machine, further comprising reinforcing vertical ribs extending downward from a lower surface of the horizontal plate portion and connected to a side surface of the vertical plate portion. In the upper frame of the construction machine according to any one of claims 1 to 5,
The pedestal beam is
A vertical piece extending downward from an edge opposite to the side on which the vertical plate portion is located at the end of the connecting portion side of the horizontal plate portion with the side frame;
The upper frame of a construction machine, wherein the vertical piece is connected to a side frame.

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