JP4885745B2 - Construction machine frame structure - Google Patents

Description

  The present invention relates to a frame structure of a construction machine such as a hydraulic excavator or a hydraulic crane having a work device attached to the front side and a counterweight attached to the rear side.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work that is provided on the front side of the upper revolving body so as to be able to move up and down. An excavation work of earth and sand can be performed by moving the working device up and down.

  The upper swing body includes a swing frame forming a support structure, a cab provided on the left front side of the swing frame, on which an operator rides, an engine and a hydraulic pump mounted on the rear side of the swing frame, and the swing A counterweight attached to the rear part of the frame and balances the weight with the work device is roughly constituted.

  Here, the turning frame is composed of a bottom plate that is turnably mounted on the lower traveling body, and left and right vertical plates that are erected on the bottom plate so as to extend linearly forward and backward. Yes. Each of the vertical plates has a working device mounting portion for mounting the working device so that the working device can be moved up and down, and a rear side of the vertical plate is a counter weight mounting portion for mounting a counterweight (see, for example, Patent Document 1). ).

JP 2001-317084 A

  The revolving frame includes a left and right front vertical plate and a rear vertical plate folded in a substantially U-shape on a bottom plate, and the rear end of each front vertical plate is rear vertical. Both are integrally fixed by welding means in a state of being abutted against the front surface of the plate (see, for example, Patent Document 2).

JP 2003-13470 A

  Here, in a construction machine such as a hydraulic excavator, in particular, a small hydraulic excavator, the working device is small, and the distance between the working device mounting portions of each vertical plate necessary for mounting the small working device is also small. On the other hand, in order to stably support the counterweight, it is necessary to increase the distance between the counterweight mounting portions of each vertical plate. However, since the turning frame according to Patent Document 1 described above is formed by extending the left and right vertical plates in a straight line in the front and rear directions, the vertical plates have different distance dimensions between the front side and the rear side. There is a problem that can not be made.

  Therefore, in Patent Document 2, the left and right front vertical plates having a small interval dimension are fixed to a substantially U-shaped rear vertical plate having a large interval dimension. However, since the mounting structure of the front vertical plate and the rear vertical plate is simply abutting and welding the rear end of each front vertical plate to the front surface of the rear vertical plate, in order to obtain sufficient rigidity, It is necessary to increase the thickness of the plate or to reinforce it, which causes problems such as a decrease in assembly workability and an increase in weight.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to adapt to both the mounting interval of the working device and the mounting interval of the counterweight, and to obtain sufficient rigidity as a support structure. It is an object of the present invention to provide a frame structure for a construction machine that can be used.

  The frame structure of a construction machine according to the present invention includes a bottom plate, a left vertical plate extending up front and rear on the bottom plate, and a front and rear on the bottom plate located on the right side of the left vertical plate. The right and left vertical plates extend in the direction, and the left and right vertical plates have a working device mounting portion for attaching a working device on the front side and a weight balance with the working device on the rear side. It is formed as a counterweight mounting portion for mounting the counterweight.

In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that one of the left vertical plate and the right vertical plate has one vertical plate extending linearly in the front and rear directions. The other vertical plate has a bent portion at an intermediate position in the front and rear directions, and the bent portion has a small space between the one vertical plate at the front side portion, and the rear side portion is the front side. Formed so that the distance between the first vertical plate and the first vertical plate is increased at the intermediate portion , and the other vertical plate is a front vertical plate and a rear vertical plate at the bent portion. And the front vertical plate is a straight plate portion whose front side extends substantially straight in the front and rear directions, and the rear side is a front bent plate portion bent in a direction away from the one vertical plate, The upper side of the straight plate portion is the working device mounting portion, and the rear vertical plate is bent in a direction in which the front side approaches the one vertical plate. The intermediate portion becomes a straight plate portion extending substantially straight in the front and rear directions, the rear side is the counterweight mounting portion, the bent portion of the other vertical plate is the front bent plate portion of the front vertical plate, The rear vertical plate is configured by overlapping and fixing the rear folded plate portion .

Further, according to the invention of claim 2, the height of the middle portion of the front SL other vertical plates is that said than the height of the middle portion of the vertical plate of one to a large value.

According to the invention of claim 3 , the rear side of the front vertical plate of the other vertical plate has a reverse T-shaped cross-sectional structure including the bottom plate, and the rear side of the one vertical plate has its upper end. A flange plate is fixed along the edge, and the cross-sectional structure including the bottom plate is formed in an I-shape.

According to a fourth aspect of the present invention, there is an engine mounting portion for mounting the engine on the front side of the counterweight mounting portion, and the position of the bent portion where the other vertical plate is bent is the position of the engine mounting portion. it is the structure is a front vicinity.

According to the invention of claim 1, of the left vertical plate and the right vertical plate, for example, the other vertical plate is a bent portion provided in the middle of the front and rear directions, and the one vertical plate at the front side portion. The distance between the two vertical plates is small, and the rear side portion is translated relative to the front side portion so that the distance between the one vertical plate and the intermediate portion is increased. In addition, the other vertical plate is divided into a front vertical plate and a rear vertical plate at a bent portion, and the front vertical plate is a straight plate portion extending substantially straight in the front and rear directions on the front side, and the one on the rear side is the one side. The front bent plate portion is bent in a direction away from the vertical plate, the upper side of the straight plate portion is a working device mounting portion, and the rear vertical plate is in a direction in which the front side approaches the one vertical plate. After bending, it becomes a bent plate part, the middle part becomes a straight plate part extending substantially straight in the front and rear directions, the rear side becomes a counterweight mounting part, and the bent part of the other vertical plate is The front bent plate portion and the rear bent plate portion of the rear vertical plate are overlapped and fixed . Therefore, the interval dimension of the counterweight attachment portion positioned on the rear side can be made larger than the interval dimension of the work device attachment portion positioned on the front side of the left and right vertical plates.

  For example, when a cab is mounted on the left side of a small frame, a large amount of space on the frame is used, so the work device mounting part of the left and right vertical plates is separated on the right side opposite to the cab. You have to put them together. However, the other vertical plate can be arranged on the left side of the other vertical plate by increasing the distance between the vertical plate and the other vertical plate on the left side. The counterweight mounting portion of the vertical plate and the counterweight mounting portion of the other vertical plate can be equally arranged in the left and right directions.

  Thus, for example, when mounting a narrow working device, the distance between the working device mounting portions can be reduced according to this working device, and the working device can be easily and reliably attached to the front side of each vertical plate. it can. In addition, each vertical plate can increase the distance between the counterweight mounting portions on the rear side regardless of the working device mounted on the front side, so that the counterweight can be stably supported.

  In addition, even if the cab is mounted on a small frame and the work device mounting part of each vertical plate is offset in the left and right directions, the counterweight mounting part of each vertical plate can be evenly arranged in the left and right directions. It is possible to mount the counterweight stably with a good balance. In addition, the other vertical plate has the rear vertical plate disposed on the outside in the left and right directions by bending, so that the rigidity can be increased compared to the case where the bent portion is formed by welding. .

  As a result, the left and right vertical plates can correspond to both the mounting interval of the working device, the mounting position and the mounting interval of the counterweight, and the mounting position, so both the working device and the counterweight can be easily In addition, it can be securely attached and workability during assembly can be improved. Further, for example, a counterweight such as a small hydraulic excavator can be stably supported. Furthermore, the other vertical plate that is bent does not need to be thickened or reinforced, so that the assembly workability can be improved, and the weight of the frame structure is reduced to increase the operating performance. be able to.

In addition, since the other vertical plate is divided into a front vertical plate and a rear vertical plate in the middle of the front and rear directions, a single bending process is applied to the rear side of the front vertical plate, One bend is applied to the front side. Then, the front bent plate part and the rear bent plate part of the front vertical plate are overlapped and fixed integrally to each other, so that each of the front vertical plate and the rear vertical plate is bent once. A complex crank-shaped or curved bent structure can be easily and accurately formed simply by processing.

In particular , a front bent plate portion obtained by bending the rear side of the front vertical plate in a direction away from one vertical plate, and a rear bent plate portion obtained by bending the front side of the rear vertical plate in a direction approaching one vertical plate; The bent portion can be formed by overlapping and fixing. That is, before the pre-bent plate portion of the vertical plate bent first diffraction, the bent plate portion of the rear vertical plate only bend 1 diffraction, easy vertical plate having a folded structure of a complex crank shape or curved shape In addition, it can be formed accurately.

Further, before and the bent plate portion after the previous folding plate portion and the rear vertical plate of the vertical plates, because they were constructed for fixing in a state superimposed, in the case of fixing for example by using a welding means, the welding length Can be secured sufficiently, and high welding strength can be obtained. Also, by adjusting the overlap margin between the front vertical plate and the rear vertical plate, the other vertical plate can be finished with an accurate dimension, and the dimensional accuracy, assembly workability, and the like can be improved.

According to the invention of claim 2 , the height dimension at the midpoint where the bent portion of the other vertical plate is provided is larger than the height dimension of the midpoint of the one vertical plate, In this bent portion, the strength can be improved by increasing the height of the vertical plate.

According to the invention of claim 3, the cross-sectional structure including the bottom plate can be formed on the rear side of the front vertical plate of the other vertical plate with an inverted T-shape. In addition, a flange plate is fixed to the rear side of one vertical plate along the upper edge thereof, and the rear side of the one vertical plate has a configuration in which a cross-sectional structure including the bottom plate forms an I-shape. can do.

According to the invention of claim 4 , since the engine mounting portion for mounting the engine is provided on the front side of the counterweight mounting portion, the engine can be mounted on the frame structure using the engine mounting portion. it can. The other vertical plate is bent near the front side of the engine mounting portion.

  Hereinafter, as a representative example of a frame structure for a construction machine according to an embodiment of the present invention, a swivel frame of a hydraulic excavator will be described as an example and described in detail with reference to FIGS.

  The first embodiment of FIGS. 1 to 8 shows a rear ultra-small turning hydraulic excavator, and the second embodiment of FIGS. 9 and 10 shows an ultra-small turning hydraulic excavator. 11 and the third embodiment shown in FIG. 12 show a small rear swivel excavator. Then, the rear vertical plate of the left vertical plate is used as a common component for the swing frames of these three types of hydraulic excavators.

  1 to 8 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 is a machine body called, for example, a rear ultra-small turning hydraulic excavator that is configured such that a rear side thereof fits within a vehicle width of the lower traveling body 2 when an upper revolving body 4 described later performs a turning operation. Further, the rear ultra-small turning type excavator 1 is provided with a cab 22 described later in order to provide a wide indoor space for the operator.

  The hydraulic excavator 1 of the rear ultra-small turning type includes a crawler-type lower traveling body 2 that can be self-propelled, and an upper revolving body 4 that is mounted on the lower traveling body 2 via a turning wheel 3 so as to be capable of turning. The upper revolving unit 4 is provided in front of the upper swinging body 4 so as to be able to move up and down, and is roughly constituted by a working device 5 that performs excavation work of earth and sand.

  In addition, the working device 5 includes a boom 5A attached to the front side of the revolving frame 11 so as to be able to move up and down, an arm 5B attached to the tip of the boom 5A so as to be rotatable, and a pivot on the tip of the arm 5B. The bucket 5C is movably attached, and includes a boom cylinder 5D, an arm cylinder 5E, and a bucket cylinder 5F that drive the bucket 5C. Further, the working device 5 is provided on the left side of the revolving frame 11 so that a cab 22 described later is disposed on the left side.

  Furthermore, as shown in FIGS. 1 and 2, an upper revolving body 4 mounted on the lower traveling body 2 via a revolving wheel 3 or the like includes a revolving frame 11, a cab 22, a counterweight 23, an engine, which will be described later. 24, the building cover 30 and the like.

  Next, reference numeral 11 denotes a turning frame constituting the frame structure of the upper turning body 4. As shown in FIG. 3, the swivel frame 11 is disposed at the center of the left and right directions and is disposed on the left and right sides of the center frame 12, which will be described later, extending in the front and rear directions. The left frame 20, the right frame 21, and the like.

  Reference numeral 12 denotes a central frame that constitutes a central portion in the left and right directions of the revolving frame 11. As shown in FIG. 4, the center frame 12 includes a bottom plate 13, a left vertical plate 14 that is erected on the left side of the upper surface of the bottom plate 13 and extends in the front and rear directions, and a right side of the left vertical plate 14. It is generally constituted by a right vertical plate 17 standing on the bottom plate 13 so as to extend forward and rearward.

  Reference numeral 13 denotes a bottom plate serving as a base of the central frame 12, and the bottom plate 13 is formed as a substantially rectangular plate extending in the front and rear directions using a thick steel plate or the like. The bottom plate 13 has the swivel wheel 3 attached to the lower surface side. And the turning center (attachment position of the center joint) when the turning operation is performed by the turning wheel 3 is a position indicated by reference numeral 13A.

  Reference numeral 14 denotes a left vertical plate as the other vertical plate which is erected on the left side of the upper surface of the bottom plate 13 and extends in the front and rear directions. The left vertical plate 14 has a bent portion 14A in the middle of the front and rear directions, the front side from the bent portion 14A is a front side portion 14B, and the rear side from the bent portion 14A is a rear side portion 14C. Yes. Further, the left vertical plate 14 has a small distance W1 between the front side portion 14B and the right vertical plate 17, and the rear side portion 14C is translated (offset) to the left side by the bent portion 14A. The distance between the right vertical plate 17 is set to a large dimension W2.

  As a result, the left vertical plate 14 is bent at an intermediate position in the front and rear directions, and is formed in a substantially crank shape or a curved shape as a whole. And the left vertical board 14 is comprised by two members of the below-mentioned front vertical board 15 and the rear vertical board 16 mentioned later divided | segmented in the position of the bending part 14A.

  Here, the above-mentioned middle part in the front and rear directions is the rear side of the turning center 13A of the bottom plate 13, and the engine mounting on the left front side among four engine mounting portions 19A, 19B, 19C, and 19D described later. This is the front portion of the portion 19A. Therefore, the position of the midpoint is about 55 to 60% from the front side of the left vertical plate 14 in the plan view of FIGS.

  Reference numeral 15 denotes a front vertical plate constituting the front side portion 14 </ b> B of the left vertical plate 14. The front vertical plate 15 has a straight plate portion 15A extending substantially straight forward and rearward on the front side, and a front bent plate portion 15B on the rear side. Further, the upper side of the straight plate portion 15A is a working device mounting portion 15C having a mountain shape in front view as shown in FIG. On the other hand, the front bent plate portion 15B is bent in a direction away from the right vertical plate 17, that is, in the left direction, as shown in FIGS. Thereby, the space | interval dimension W1 between the straight board part 15A (working apparatus attachment part 15C) of the front vertical board 15 and the right vertical board 17 (working apparatus attachment part 17A) is the straight board part of the rear vertical board 16 mentioned later. It is smaller than the interval dimension W2 between 16B and the right vertical plate 17 (W1 <W2).

  Thus, by reducing the distance dimension W1 between the working device mounting portion 15C of the front vertical plate 15 and the working device mounting portion 17A of the right vertical plate 17, a value suitable for the mounting interval of the small working device 5 is obtained. Therefore, the boom 5A of the working device 5 can be easily connected between the working device mounting portion 15C of the front vertical plate 15 and the working device mounting portion 17B of the right vertical plate 17 without using a separate attachment or the like. And can be securely attached.

  Further, the left vertical plate 14 is formed in a crank shape or a curved shape at a midpoint thereof by two bending processes. However, since the front bent plate portion 15B of the front vertical plate 15 can be formed by only one bending process, it can be processed relatively easily even with a thick plate such as a steel plate, and the processing accuracy can be increased.

  Further, as shown in FIG. 7, the front bent plate portion 15B side (rear side) of the front vertical plate 15 has a reverse T-shaped cross-sectional structure including the bottom plate 13 and is also a welded portion with the rear vertical plate 16. . Therefore, as shown in FIG. 7, the front bent plate 15B side of the front vertical plate 15 has a height dimension H1 at that position larger than the height dimension H2 at the midpoint of the right vertical plate 17. (H1> H2). Thereby, the front bending board part 15B side of the front vertical board 15 can be formed with sufficient intensity | strength. In addition, since the front bent plate portion 15B side of the front vertical plate 15 is raised, the weld length when welding with the rear vertical plate 16 can be lengthened to increase the welding strength.

  Further, since the front bent plate portion 15B of the front vertical plate 15 is bent at a gentle bending angle (obtuse angle), it can be easily bent to a predetermined angle, and the front side from the bent portion is loose. It is possible to rise, and it is possible to prevent stress from concentrating on this portion.

  On the other hand, 16 is a rear vertical plate constituting the rear side portion 14 </ b> C of the left vertical plate 14. The rear vertical plate 16 has a rear bent plate portion 16A on the front side, a straight plate portion 16B extending almost straight in the front and rear directions, and a counterweight mounting portion 16C for attaching a counterweight 23 described later on the rear side. It has become. Further, the rear vertical plate 16 is formed in a gentle trapezoidal shape with the front side raised as shown in FIG. Further, as shown in FIGS. 4 and 8, the rear bent plate portion 16A is bent in the direction approaching the right vertical plate 17, that is, in the right direction, whereby the straight plate portion 16B of the rear vertical plate 16 and the right vertical plate 16B are bent. The distance W2 between the plates 17 is larger than the distance W1 between the straight plate portion 15A of the front vertical plate 15 and the right vertical plate 17 (W2> W1).

  Here, when the upper swing body 4 is small and the cab 22 is mounted, the rear ultra-small swing type hydraulic excavator 1 uses a lot of space on the left side from the vicinity of the center of the swing frame 11 to install the cab 22. The working device mounting portion 15C of the front vertical plate 15 and the working device mounting portion 17A of the right vertical plate 17 that constitute the left vertical plate 14 need to be shifted to the right side that is opposite to the cab 22. However, when the rear vertical plate 16 is moved to the left side and the distance W2 between the right vertical plate 17 is increased, the work device mounting portions 15C and 17A of the vertical plates 15 and 17 are shifted to the right. However, the counterweight mounting portion 16C of the rear vertical plate 16 and the counterweight mounting portion 17B of the right vertical plate 17 can be evenly arranged in the left and right directions with respect to the center of gravity of the counterweight 23. Thereby, the counterweight 23 which is a heavy article can be stably supported.

  Further, the rear bent plate portion 16A of the rear vertical plate 16 is bent at the same angle (obtuse angle) as the front bent plate portion 15B of the front vertical plate 15, and the height dimension is also a corresponding halfway position of the right vertical plate 17. It is set to a value larger than the height dimension. Thereby, the rear folding plate portion 16 </ b> A of the rear vertical plate 16 can obtain the same effects as the front folding plate portion 15 </ b> B of the front vertical plate 15.

  Next, a method for fixing the front vertical plate 15 and the rear vertical plate 16 will be described. The front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are overlapped with each other. Weld to. At this time, since the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are formed high (longer in the upward and downward directions), the welding length (weld bead) is sufficient. The welding strength can be increased. In addition, sufficient strength can be obtained by superposition structure in terms of strength. On the other hand, the straight plate portion 16B of the rear vertical plate 16 and the right side are adjusted by adjusting the overlap margin when the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are overlapped. It is possible to finish the distance W2 between the vertical plate 17 and the accurate dimension with a simple operation.

  Further, for example, when the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are abutted and welded, the butt end is accurately finished by cutting and the weld bead is enlarged. Although it is necessary to pile up, welding by overlapping does not require finishing accuracy for each of the front bent plate portions 15B and 16A, and thus can be easily manufactured. Moreover, since the welding position can be varied forward and backward, stress can be dispersed.

  Reference numeral 17 denotes a right vertical plate as one vertical plate which stands upright on the upper surface of the bottom plate 13 and extends in the front and rear directions. The right vertical plate 17 is formed to extend linearly in the front and rear directions. ing. Further, the front side of the right vertical plate 17 rises in a mountain shape when viewed from the rear as shown in FIG. It has become. A strip-shaped flange plate 17C is integrally welded to the rear side of the right vertical plate 17 along the upper edge. As a result, the rear portion of the right vertical plate 17 can have an I-shaped cross-sectional structure including the bottom plate 13 as shown in FIG. 7, so that sufficient strength can be obtained even when the height dimension H2 is low. Obtainable.

  Reference numeral 18 denotes a reinforcing plate that is joined between the front side of the left vertical plate 14 (front vertical plate 15) and the front side of the right vertical plate 17, and on the front side of the reinforcing plate 18 is a boom cylinder of the working device 5. A cylinder bracket 18A for 5D is fixed.

  19A, 19B, 19C, 19D are four engine mounting portions (referred to as engine mounting portions 19 as a whole) provided on the rear side of the bottom plate 13, and the engine mounting portions 19A, 19B, 19C, 19D are Between the plate 14 (rear vertical plate 16) and the right vertical plate 17, a left front, a right front, a left rear, and a right rear are arranged at predetermined intervals. Each engine mounting portion 19 supports an engine 24 described later via an engine mount (not shown). Here, since the engine 24 cannot straddle the vertical plates 14 and 17 due to its structure, the four engine mounting portions 19 must be arranged between the left vertical plate 14 and the right vertical plate 17 in total. There is. For this structural reason, the distance W2 between the rear vertical plate 16 and the right vertical plate 17 is large.

  Reference numeral 20 denotes a left frame (see FIG. 3) provided on the left side of the central frame 12. The front side of the left frame 20 is designed so that a cab 22 described later can be mounted, and is formed in a rectangular shape in accordance with the bottom shape of the cab 22. That is, the left frame 20 includes a side frame 20A that is located at the left end and extends linearly in the front and rear directions, a plurality of extended beams 20B that attach the side frame 20A to the central frame 12, and the side frame 20A. The cab support portion 20C attached to the front end portion is roughly configured.

  Reference numeral 21 denotes a right frame provided on the right side of the central frame 12, and the right frame 21 is mounted with a fuel tank 27, a hydraulic oil tank 28, a control valve 29 and the like which will be described later. The periphery of the right frame 21 is curved in an arc shape so that the right frame 21 fits within the vehicle width of the lower traveling body 2 when turning. That is, the right frame 21 is roughly constituted by a side frame 21A that is located at the right end and has a front side curved leftward, and a plurality of overhanging beams 21B that attach the side frame 21A to the central frame 12.

  Next, equipment mounted on the revolving frame 11 configured as described above will be described. First, 22 is a cab mounted on the left front side of the revolving frame 11. The cab 22 has a size equivalent to that of a cab that is normally used in a medium-sized hydraulic excavator or the like, and is configured to ensure operability and comfort.

  Reference numeral 23 denotes a counterweight disposed on the rear side of the revolving frame 11, and the counterweight 23 is formed as a heavy object that balances the weight with the work device 5. Further, the counterweight 23 is formed in a substantially arc shape so as to fit within the vehicle width of the lower traveling body 2 when turning. The counterweight 23 is attached to the counterweight attachment portion 16C of the rear vertical plate 16 forming the left vertical plate 14 and the counterweight attachment portion 17B of the right vertical plate 17. At this time, the distance W2 between the rear vertical plate 16 and the right vertical plate 17 can be widened by bending the left vertical plate 14, so that the counterweight 23 is stabilized with respect to the revolving frame 11. Can be installed.

  Reference numeral 24 denotes an engine provided between the cab 22 and the counterweight 23 and provided on the rear side of the turning frame 11. The engine 24 is mounted on the rear side of the central frame 12 in a horizontal state extending in the left and right directions. The engine 24 is attached to each engine attachment portion 19 via a vibration isolation mount (not shown). A hydraulic pump 25 is attached to the right side of the engine 24, and a heat exchanger 26 such as a radiator or an oil cooler is disposed on the left side.

  A fuel tank 27 is located on the front side of the hydraulic pump 25 and is mounted on the right frame 21 of the revolving frame 11. A hydraulic oil 28 is used for operating the working device 5 disposed on the left side of the fuel tank 27. Each hydraulic oil tank to be stored is shown. A control valve 29 is disposed in front of each of the tanks 27 and 28. Reference numeral 30 denotes a building cover provided on the revolving frame 11 between the cab 22 and the counterweight 23. The building cover 30 covers the engine 24 and the like.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration. Next, an assembling operation of the upper swing body 4 including the swing frame 11 will be described.

  First, when the central frame 12 of the revolving frame 11 is assembled, left and right vertical plates 14 and 17 are erected on the bottom plate 13 and are integrally fixed to the bottom plate 13 using welding means. At this time, the left vertical plate 14 has a rear vertical plate by adjusting a stacking margin when the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are overlapped. The distance dimension W2 between 16 and the right vertical plate 17, that is, the distance dimension between the counterweight mounting portions 16C and 17B can be finished to an accurate dimension with a simple operation. When the central frame 12 is assembled, the revolving frame 11 can be assembled by welding the left frame 20 and the right frame 21 to the left and right sides of the central frame 12.

  When the revolving frame 11 is assembled in this way, the boom 5A of the work device 5 is attached between the work device attachment portion 15C of the front vertical plate 15 and the work device attachment portion 17A of the right vertical plate 17. In this case, since the space dimension W1 between the front side portion 14B of the left vertical plate 14 and the right vertical plate 17 is reduced, each work device mounting portion 15C, 17A is separately attached to the work device 5 having a narrow width. It is possible to easily and reliably attach without using.

  Further, the counterweight 23 is attached to the counterweight mounting portion 16C of the rear vertical plate 16 and the counterweight mounting portion 17B of the right vertical plate 17. Here, since the cab 22 equivalent to the cab of the standard specification is mounted on the small turning frame 11, it is necessary to arrange the working device 5 so as to be shifted to the right side. In this case, normally, the mounting position of the counterweight 23 is also shifted to the right side and cannot be stably mounted on the revolving frame 11.

  However, the left vertical plate 14 moves the rear side portion 14C, that is, the counter weight mounting portion 16C of the rear vertical plate 16 to the left side by the bent portion 14A, and the counter weight 23 by the counter weight mounting portions 16C and 17B. The mounting width dimension (the distance dimension W2 between the rear vertical plate 16 and the right vertical plate 17) is increased. As a result, the center of gravity of the counterweight 23, which is a heavy object, can be arranged at the approximate center in the left and right directions of the revolving frame 11, so that the counterweight 23 can be stably supported.

  Next, a case where work is performed using the excavator 1 according to the first embodiment will be described. In this case, the operator can drive the lower traveling body 2 to move the hydraulic excavator 1 forward or backward by getting on the cab 22 and operating the operation lever for traveling. Further, by operating an operation lever for work (both not shown), the work device 5 can be moved up and down to perform excavation work of earth and sand.

  As described above, according to the first embodiment, the left vertical plate 14 is divided into the front vertical plate 15 and the rear vertical plate 16 at a midway position in the front and rear directions before becoming the bent portion 14A. A front bent plate portion 15B is provided by bending leftward at the rear position of the front vertical plate 15, and a rear bent plate portion 16A is provided by bending rightward at a front position of the rear vertical plate 16. Then, the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 are integrally fixed so that the intermediate portion in the front and rear directions is folded into a crank shape or a curved shape. A bent left vertical plate 14 can be formed.

  First, since the left vertical plate 14 is bent into a crank shape or a curved shape, the distance between the front vertical plate 15 and the right vertical plate 17 can be reduced, and the distance between the rear vertical plate 16 and the right vertical plate 17. Can be increased. That is, the space dimension W1 between the straight plate portion 15A (working device mounting portion 15C) and the right vertical plate 17 (working device mounting portion 17A) of the front vertical plate 15 can be reduced, and the rear vertical plate 16 is smaller than the front space size W1. The distance dimension W2 between the straight plate portion 16B (counterweight mounting portion 16C) and the right vertical plate 17 (counterweight mounting portion 17B) can be increased.

  Thereby, even when the narrow working device 5 is mounted, the interval W1 on the working device mounting portions 15C, 17A side can be reduced in accordance with the mounting interval of the boom 5A of the working device 5, and the vertical plates 14, 17 can be reduced. The working device 5 can be easily and reliably attached to the front side.

  Further, when the cab 22 equivalent to the standard specification cab is mounted on the small turning frame 11, it is necessary to arrange the working device 5 so as to be shifted to the right side. However, since the left vertical plate 14 has moved the rear vertical plate 16 to the left side by the bent portion 14 </ b> A, each of the vertical plates 16, 17 is located at a position sandwiching the turning center 13 </ b> A of the bottom plate 13 constituting the turning frame 11. Counterweight attachment portions 16C and 17B can be arranged. As a result, the center of gravity of the counterweight 23, which is a heavy object, can be arranged at the center in the left and right directions of the revolving frame 11, and can be supported with a wide mounting width. Even when it is difficult to remove, the counterweight 23 can be stably supported.

  As a result, the left and right vertical plates 14 and 17 constituting the revolving frame 11 can correspond to both the mounting interval of the working device 5 and the mounting interval of the counterweight 23, so attachments such as spacers and brackets can be attached. Without using it separately, both the working device 5 and the counterweight 23 can be easily and reliably attached, and the attachment strength, assembly workability, etc. can be improved.

  Further, as a means for translating the rear vertical plate 16 to the left with respect to the front vertical plate 15, each front bent plate portion 15B and the rear bent plate portion 16A are configured to be bent. The rigidity can be increased as compared with the case of forming by. As a result, it is not necessary to increase the thickness of the vertical plates 14 and 17 or to reinforce them, so that the assembly workability can be improved, and the weight of the revolving frame 11 can be reduced to improve the operating performance. Can be increased.

  In addition, since the left vertical plate 14 is divided into the front vertical plate 15 and the rear vertical plate 16 at a midway position in the front and rear directions, the front vertical plate 15 is bent forward by a single bending process. The plate portion 15B can be formed, and the rear folded plate portion 16A can be formed on the front side of the rear vertical plate 16 by a single bending process. The left vertical plate 14 can be formed by integrally fixing the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16. Therefore, the left vertical plate 14 having a complicated crank-shaped or curved bent structure can be easily and accurately simply by performing a simple bending process once on the front vertical plate 15 and the rear vertical plate 16. Can be formed.

  Further, the left vertical plate 14 has a height dimension H1 of the vicinity of the bent position including the front bent plate portion 15B of the front vertical plate 15 and the rear bent plate portion 16A of the rear vertical plate 16 with respect to the right vertical plate 17. The height is set to a value larger than the height dimension H2 at the midpoint. As a result, the positions of the respective front bent plate portions 15B and 16A can increase the structural strength as much as they are formed, and the weld length can be increased, so that sufficient rigidity can be obtained. it can.

  Furthermore, since the front vertical plate 15 and the rear vertical plate 16 are configured to be integrally fixed in a state where the front bent plate portions 15B and 16A are overlapped, when fixing using welding means, A sufficient weld length can be secured, and a high weld strength can be obtained. Further, by adjusting the overlap margin between the front vertical plate 15 and the rear vertical plate 16, the left vertical plate 14 can be finished with an accurate dimension, and the dimensional accuracy, assembly workability, and the like can be improved.

  Next, FIG. 9 and FIG. 10 show a second embodiment of the present invention. The feature of this embodiment is that the rear vertical plate of the left vertical plate according to the first embodiment described above is used as a common part for the swing frame of the ultra-small swing type excavator. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 9, reference numeral 31 denotes a hydraulic excavator according to the second embodiment. This hydraulic excavator 31 is, for example, an ultra-small turning type hydraulic excavator configured so that the entire structure including the offset type work device 33 fits within the vehicle width of the lower traveling body 2 when the upper turning body 32 is turned. It is a called aircraft. Moreover, the cab 44 described later is attached to the ultra-small turning excavator 1 in order to reduce the turning radius.

  Further, the ultra-small turning excavator 31 is different from the backward ultra-small turning excavator 1 according to the first embodiment in the working device 33, the turning frame 34 of the upper turning body 32, the cab 44, and the like. Yes. On the other hand, the ultra-small turning excavator 31 uses the rear vertical plate 16 of the left vertical plate 14 constituting the turning frame 11 of the rear ultra-small turning excavator 1 according to the first embodiment as a common part. is doing.

  Here, the working device 33 of the ultra-small swivel excavator 31 includes a first boom 33A attached to the front side of a swivel frame 34, which will be described later, so as to be able to move up and down, and left and right at the tip of the first boom 33A. A second boom 33B that is swingably mounted in the direction, a third boom 33C that is swingably mounted left and right at the tip of the second boom 33B, and a tip of the third boom 33C An arm 33D pivotably attached to the arm 33D, a bucket 33E movably attached to the tip of the arm 33D, and an offset link for orienting (offset) the third boom 33C relative to the first boom 33A. 33F, and a boom cylinder 33G, an arm cylinder 33H, a bucket cylinder 33J, and an offset cylinder 33K that drive them.

  Reference numeral 34 denotes a turning frame as a frame structure according to the second embodiment, which is a base of the upper turning body 32. As shown in FIG. 10, the ultra-small turning type turning frame 34 includes a center frame 35, a left frame 42, a right frame 43 and the like which will be described later. In this case, the rear vertical plate 16 of the left vertical plate 14 according to the first embodiment is used as a common component for the ultra-small swivel frame 34.

  Reference numeral 35 denotes a central frame of the ultra small turning type turning frame 34. The center frame 35 includes a bottom plate 36, a left vertical plate 37 including a bent portion 37A, a front side portion 37B, and a rear side portion 37C, a front vertical plate 38 that forms a front side portion 37B of the left vertical plate 37, and a left vertical plate. The aforementioned rear vertical plate 16 forming the rear side portion 37C of the plate 37, the right vertical plate 39, the reinforcing plate 40, four engine mounting portions 41A, 41B, 41C, 41D (referred to as the engine mounting portion 41 as a whole), etc. It is comprised by.

  Here, the central frame 35 can use the rear vertical plate 16 of the central frame 12 according to the first embodiment as a common component. Further, the bottom plate 36 has a turning center 36A when the turning operation is performed, and bending positions of the front vertical plate 38 and the rear vertical plate 16 are arranged at a midpoint between the turning center 36A and the engine mounting portion 41. ing.

  Reference numeral 42 denotes a left frame provided on the left side of the central frame 35. The left frame 42 is used exclusively for the ultra-small turning type turning frame 34. The left front side of the left frame 42 is curved in an arc shape so that the left frame 42 fits within the vehicle width of the lower traveling body 2 when turning. That is, the left frame 42 is attached to the front end of the side frame 42A, a side frame 42A that is located at the left end and has a front side curved rightward, a plurality of overhanging beams 42B that attach the side frame 42A to the central frame 35, and the side frame 42A. The cab support part 42C is generally constituted.

  Reference numeral 43 denotes a right frame provided on the right side of the central frame 35. The right frame 43 is composed of a side frame 43A, an extended beam 43B, and the like, almost the same as the right frame 21 according to the first embodiment.

  Reference numeral 44 denotes an ultra-small turning type cab according to the second embodiment mounted on the left front side of the turning frame 34. The cab 44 is curved in a circular arc shape on the right side toward the front side so that the left side of the cab 44 fits within the vehicle width of the lower traveling body 2 when turning. As a result, the cab 44 can turn without interfering with surrounding members as long as the lower traveling body 2 can travel.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, in the second embodiment, the rear vertical plate 16 of the left vertical plate 14 constituting the swing frame 11 of the rear ultra-small swing hydraulic excavator 1 according to the first embodiment is used as the ultra-small swing hydraulic. The swivel frame 34 of the excavator 31 can be used as a common part. Thereby, the number of parts of the revolving frame 34 can be reduced, and the assembly workability can be improved and the manufacturing cost can be reduced.

  Next, FIG. 11 and FIG. 12 show a third embodiment of the present invention. The feature of this embodiment is that the rear vertical plate of the left vertical plate according to the first embodiment described above is used as a common part for the swing frame of the rear small swing type hydraulic excavator. Note that in the third embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 11, 51 indicates a hydraulic excavator according to the third embodiment. The hydraulic excavator 51 is configured so that the rear side thereof does not protrude greatly from the vehicle width of the lower traveling body 2 when the upper revolving body 52 is turned. Further, the backward small swing type hydraulic excavator 51 according to the present embodiment includes a swing type working device 53 on the front side.

  Further, the rear small swing type hydraulic excavator 51 is different from the rear ultra small swing type hydraulic excavator 1 according to the first embodiment in the working device 53, the swing frame 54 of the upper swing body 52, and the like. On the other hand, the rear small turning type hydraulic excavator 51 uses the rear vertical plate 16 of the left vertical plate 14 constituting the turning frame 11 of the rear ultra small turning hydraulic excavator 1 according to the first embodiment as a common component. is doing.

  Here, the swing type work device 53 includes a swing post 53A attached to a front portion of a swing frame 54, which will be described later, so as to be able to swing leftward and rightward, and a boom attached to the swing post 53A so as to be able to move up and down. 53B, an arm 53C rotatably attached to the tip of the boom 53B, a bucket 53D movably attached to the tip of the arm 53C, a boom cylinder 53E, an arm cylinder 53F for driving these, A bucket cylinder 53G and a swing cylinder (not shown) are included.

  Reference numeral 54 denotes a turning frame as a frame structure according to the third embodiment, which is a base of the upper turning body 52. As shown in FIG. 12, the rear small turning type turning frame includes a center frame 55, a left frame 62, a right frame 63 and the like which will be described later. Here, the rear vertical plate 16 of the left vertical plate 14 according to the first embodiment is used as a common component in the rear small turning type turning frame 54.

  Reference numeral 55 denotes a central frame of the rear small turning type turning frame 54. The central frame 55 includes a bottom plate 56, a left vertical plate 57 including a bent portion 57A, a front side portion 57B, and a rear side portion 57C, a front vertical plate 58 forming a front side portion 57B of the left vertical plate 57, and a left vertical plate. The rear vertical plate 16 that forms the rear side portion 57C of the plate 57, the right vertical plate 59, four engine mounting portions 60A, 60B, 60C, 60D (referred to as the engine mounting portion 60 as a whole) and the like. Yes. Further, the central frame 55 is provided with a post support portion 61 as a working device mounting portion that is positioned in front of the left and right vertical plates 57 and 59 and supports the swing post 53A of the working device 53.

  Here, the central frame 55 can use the rear vertical plate 16 of the central frame 12 according to the first embodiment as a common component. Further, the bottom plate 56 has a turning center 56A when the turning operation is performed, and bending positions of the front vertical plate 58 and the rear vertical plate 16 are arranged at a midpoint between the turning center 56A and the engine mounting portion 60. ing.

  62 is a left frame provided on the left side of the central frame 55. The left frame 62 is substantially the same as the left frame 20 according to the first embodiment by a side frame 62A, a protruding beam 62B, a cab support portion 62C, and the like. It is configured.

  Reference numeral 63 denotes a right frame provided on the right side of the central frame 55. The right frame 63 includes a side frame 63A, an overhanging beam 63B, and the like, almost the same as the right frame 21 according to the first embodiment.

  Furthermore, 64 is a cab mounted on the left front side of the turning frame 54, and the cab 64 is configured in substantially the same manner as the rear ultra-small turning type cab 22 according to the first embodiment.

  Thus, also in the third embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the above-described embodiments. In particular, in the third embodiment, as in the second embodiment, the rear vertical plate 16 of the left vertical plate 14 constituting the swing frame 11 of the rear ultra-small swing excavator 1 is moved backward. The swivel frame 54 of the hydraulic excavator 51 can also be used as a common part.

  In the first embodiment, the left vertical plate 14 as the other vertical plate is divided into a front vertical plate 15 and a rear vertical plate 16 at a bent portion 14A located in the middle of the front and rear directions. A left bent front bent plate portion 15B is provided at the rear position of the front vertical plate 15 by one bending operation, and a right rear bent plate portion 16A is provided at the front position of the rear vertical plate 16 by one bending operation. As an example, a case where the front bent plate portions 15B and 16A are integrally fixed to each other and the intermediate portions in the front and rear directions are bent into a crank shape or a curved shape has been described as an example.

  However, the present invention is not limited to this. For example, the left vertical plate having a crank shape or a curved shape may be formed by bending a single plate material twice. This configuration can be similarly applied to other embodiments.

  Further, in the first embodiment, four engine mounting portions 19A, 19A, a middle portion (folded portion 14A) in the front and rear direction of the left vertical plate 14 are located behind the turning center 13A of the bottom plate 13. Of 19B, 19C, and 19D, it is the front part of the left front side engine mounting portion 19A, and the case where the position is about 55 to 60% from the front side of the left vertical plate 14 in the plan view of FIG.

  However, the present invention is not limited to this. For example, as in the modification shown in FIG. 13, the left vertical plate 71 is located in the middle of the front and rear directions before the front vertical plate 72 and the rear vertical plate 73 are bent and connected. For example, the (folded portion 71A) may be configured to have a position of about 45 to 55% from the front side of the left vertical plate 71 in a plan view at a position spaced forward from the left front engine mounting portion 19A. As described above, the position of the middle part (folded portion 71A) in the front and rear direction of the left vertical plate is determined for each model and specification depending on the position, size, and piping of the cab, engine, and tank. It is not limited to the range mentioned above.

  Moreover, in each embodiment, the hydraulic excavators 1, 31, 51 including the crawler type lower traveling body 2 were described as examples of the construction machine. However, the present invention is not limited to this. For example, the present invention may be applied to a swing frame of a hydraulic excavator provided with a wheel-type lower traveling body. Further, in addition to the hydraulic excavator, it can be widely applied to frame structures of other construction machines such as a hydraulic crane, a wheel loader, and a tractor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a rear ultra-small turning hydraulic excavator provided with a turning frame according to a first embodiment of the present invention. It is an enlarged plan view which shows the upper revolving body in FIG. 1 in the state which removed the building cover. It is a top view which shows a back ultra small turning type turning frame alone. It is a top view which expands and shows a center frame. It is a front view which expands and shows a center frame. It is a rear view which expands and shows a center frame. It is sectional drawing which looked at the height dimension of the middle location of a left vertical board and a right vertical board from the arrow VII-VII direction in FIG. It is a disassembled perspective view of the principal part expansion which shows the attachment state of a front vertical board and a rear vertical board. It is a front view which shows the ultra small turning type hydraulic excavator provided with the turning frame by the 2nd Embodiment of this invention. It is a top view which expands and shows the turning frame in FIG. 9 alone. It is a front view which shows the back small turning type hydraulic excavator provided with the turning frame by the 3rd Embodiment of this invention. It is a top view which expands and shows the turning frame in FIG. 11 alone. It is a top view which shows the center frame by the modification of this invention.

Explanation of symbols

1, 31, 51 Hydraulic excavator 4, 32, 52 Upper revolving body 5, 33, 53 Working device 11, 34, 54 Revolving frame (frame structure)
12, 35, 55 Center frame 13, 36, 56 Bottom plate 13A, 36A, 56A Turning center 14, 37, 57, 71 Left vertical plate (the other vertical plate)
14A, 37A, 57A, 71A Bent part 14B, 37B, 57B Front side part 14C, 37C, 57C Rear side part 15, 38, 58, 72 Front vertical plate 15A, 16B Straight plate part 15B Front bent plate part 15C, 17A Work device mounting portion 16, 73 Rear vertical plate 16A Rear bent plate portion 16C, 17B Counterweight mounting portion 17, 39, 59 Right vertical plate (one vertical plate)
19, 41, 60 Engine mounting portion 20, 42, 62 Left frame 21, 43, 63 Right frame 22, 44, 64 Cab 23 Counterweight 61 Post support portion (working device mounting portion)
W1 Distance between the front vertical plate and the right vertical plate of the left vertical plate W2 Space between the rear vertical plate and the right vertical plate of the left vertical plate H1 Height of the middle part (folding position) of the left vertical plate Dimension H2 Height dimension in the middle of the right vertical plate

Claims (4)

A bottom plate, a left vertical plate standing on the bottom plate extending in the front and rear directions, and a right vertical plate positioned on the right side of the left vertical plate and extending in the front and rear directions on the bottom plate The left and right vertical plates are formed with a work device mounting portion for attaching a work device on the front side and a counter weight mounting portion for attaching a counter weight for balancing the weight with the work device on the rear side. In the construction machine frame structure
Of the left vertical plate and the right vertical plate, one vertical plate extends linearly in the front and rear directions, and the other vertical plate has a bent portion in the middle of the front and rear directions. The space between the one vertical plate at the front side portion is reduced by the bent portion, and the rear side portion is translated relative to the front side portion to increase the space between the one vertical plate at the intermediate portion. Formed as
And the other vertical plate is divided into a front vertical plate and a rear vertical plate at the bent portion ,
The front vertical plate is a straight plate portion whose front side extends substantially straight in the front and rear directions, and the rear side is a front bent plate portion bent in a direction away from the one vertical plate, and the straight plate portion The upper side of the work device mounting portion,
The rear vertical plate is a rear bent plate portion whose front side is bent in a direction approaching the one vertical plate, the intermediate portion is a straight plate portion extending substantially straight forward and rearward, and the rear side is the counterweight mounting Part
The folding part of the other vertical plate is constructed by overlapping and fixing the front bent plate part of the front vertical plate and the rear bent plate part of the rear vertical plate. Frame structure. The height of the middle portion of the front SL other vertical plate construction machine frame structure according to claim 1, characterized in that the height greater than the dimension of the middle portion of the vertical plate of the one body. The rear side of the front vertical plate of the other vertical plate has a reverse T-shaped cross-sectional structure including the bottom plate, and a flange plate is fixed to the rear side of the one vertical plate following its upper edge. The frame structure for a construction machine according to claim 2, wherein a cross-sectional structure including the bottom plate has an I-shape. 2. An engine mounting portion for mounting an engine is provided on the front side of the counterweight mounting portion, and the position of the bent portion where the other vertical plate is bent is near the front side of the engine mounting portion. A frame structure for a construction machine according to claim 2, 2 or 3 .

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