JP5458069B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine provided with a turning frame.

  In general, a construction machine such as a hydraulic excavator or a hydraulic crane is capable of a self-propelled lower traveling body, an upper revolving body that is swingably mounted on the lower traveling body, and can be moved up and down on the front side of the upper revolving body. It is comprised by the provided working device, and excavation work of earth and sand etc. are performed using this working device.

  In this case, the upper revolving structure is disposed on the opposite side of the cab with the revolving frame forming the support structure, the cab provided on the left side of the front portion of the revolving frame, defining the operator's cab, and the work device. An oil storage tank such as a fuel tank and a hydraulic oil tank, a prime mover and a hydraulic pump mounted on the rear side of the swing frame, and a counterweight provided on the rear end side of the swing frame are roughly configured.

  On the other hand, the swivel frame is normally arranged in the center part in the left and right directions and extends in the front and rear directions, and the left and right side frames provided on both the left and right sides across the center frame, It is composed of left and right overhanging beams provided between the center frame and the left and right side frames.

  In this case, the center frame has a thick bottom plate and left and right vertical plates erected on the bottom plate, and between the center frame and the left side frame from the left vertical plate to the left side. The center frame and the right side frame are connected by a projecting left projecting beam, and the center frame and the right side frame are connected by a right projecting beam projecting rightward from the right vertical plate. A cab is usually attached to the front left side of the revolving frame via an anti-vibration mount, and the cab is disposed above the left side frame (see, for example, Patent Document 1).

JP 2003-20681 A

  By the way, the side frame constituting the swivel frame according to the prior art usually has a cylindrical body (D-type frame) whose inside is a D-shaped closed section space by welding two plate materials having different thicknesses. It is formed using. That is, the side frame is constituted by a cylindrical body mainly composed of a thick plate material that receives a load and a thin plate material that is welded to the thick plate material to form the outer surface of the side frame.

  However, in a side frame formed using a cylindrical body composed of a thick plate and a thin plate, if there is a large difference between the thickness of the thick plate and the thickness of the thin plate, When the stress is concentrated on the joint portion with the plate material, the strength of the side frame is lowered. For this reason, when the thickness of the thick plate material is increased, it is necessary to increase the thickness of the thin plate material accordingly. As a result, there is a problem that the weight of the entire side frame increases and the appearance beauty of the side frame decreases.

  On the other hand, the strength of the side frame whose inside is a closed cross-sectional space can be increased by increasing the cross-sectional area of the side frame. For this reason, the swivel frame according to the prior art is usually configured to increase the strength of the side frame by extending the closed cross-sectional space of the side frame upward and downward to increase the cross-sectional area.

  However, since the cab is mounted on the left side frame of the swivel frame, the left side frame is extended from the lower end (ground) of the lower traveling body by extending the closed sectional space of the left and right side frames upward and downward. When the height dimension to the upper surface of the cab increases, the height dimension from the ground to the upper end of the cab increases. As a result, for example, when a hydraulic excavator is loaded on a container for transportation, the upper end side of the cab interferes with the ceiling portion of the container, and the hydraulic excavator cannot be loaded on the container.

  The present invention has been made in view of the above-described problems of the prior art, so that the strength of the side frame can be increased and the ground height of the upper end portion of the cab mounted on the side frame can be suppressed. The purpose is to provide a construction machine.

  The present invention comprises a self-propelled lower traveling body, and an upper revolving body having a revolving frame mounted on the lower traveling body so as to be capable of swiveling, and a working device provided on the revolving frame. The revolving frame of the revolving structure includes a center frame that is disposed at the center in the left and right directions and extends in the front and rear directions, and left and right side frames that are provided on both the left and right sides of the center frame, A left and right extension beam provided between the center frame and the left and right side frames, and driving between one side frame and the center frame of the left and right side frames. A construction machine provided with a cab defining a chamber and an oil storage tank for storing fuel and / or hydraulic oil between the other side frame of the left and right side frames and the center frame It is applied to.

  The feature of the configuration adopted by the invention of claim 1 is that the one side frame is formed by using a strong member made of a thick solid material, and the other side frame is a hollow cylindrical body. The height dimension between the lower end of the lower traveling body and the upper surface of the one side frame is a height between the lower end of the lower traveling body and the upper surface of the other side frame. This is because an outer surface cover formed by using a thin plate material is attached to the strength member using a fastening member.

  According to a second aspect of the present invention, a strength member side bracket is provided on the outer side surface of the strength member, a cover side bracket is provided on the inner side surface of the outer cover, and the strength member side bracket and the cover side bracket are fastened together. By fastening with a member, the outer cover is attached to the strength member.

  According to a third aspect of the present invention, the center frame includes a bottom plate and left and right vertical plates that are erected on the bottom plate and extend in the front and rear directions, and the strength member is disposed on the front side of the cab. It is formed as an L-shaped strength member by a front beam portion positioned and extending in the left and right directions, and a vertical beam portion bent from the front beam portion and extending in the front and rear directions along the outer surface of the cab, A connecting arm extending rearward from the inner end is provided at the inner end of the front beam, and the inner portion of the front beam is one side of the left and right vertical plates via the connection arm. The vertical beam is fixed to the vertical plate by welding means and fixed to the upper surface of the bottom plate by welding means, and the vertical beam portion is fixed to one of the left and right extended beams by the welding means. It is in the configuration.

  According to a fourth aspect of the present invention, the outer surface cover is located on the front side of the cab and extends leftward and rightward, and is connected to an end portion of the front outer surface cover along the outer surface of the cab. That is, it is composed of two members, a longitudinal outer cover extending in the front and rear directions.

  According to the invention of claim 1, since the one side frame is formed using the strength member made of solid material, the strength of the one side frame is increased by increasing the thickness of the strength member. The cab can be stably supported. In addition, since the side frame on one side is formed using a strength member made of a solid material, a closed cross-sectional space formed inside like the side frame on the other side formed using a cylindrical body. There is no need to increase the strength upward and downward.

  Accordingly, the upper and lower dimensions (height dimension) of the one side frame can be made smaller than the height dimension of the other side frame, and the lower end of the lower traveling body and the side frame of the one side frame can be reduced. The height dimension between the upper surface and the upper surface can be set lower than the height dimension between the lower end of the lower traveling body and the upper surface of the other side frame. As a result, even when the cab is mounted on one side frame, the ground height of the upper end of the cab can be kept low. Therefore, when the construction machine is loaded on the transportation container, it is possible to prevent the upper end side of the cab from interfering with the transportation container, and the construction machine can be reliably loaded on the container.

  Furthermore, by attaching an outer surface cover formed of a thin plate material to a strength member using a fastening member, the strength member can be covered from the outside by this outer surface cover, and the appearance beauty of one side frame is maintained. Can do.

  According to the invention of claim 2, the outer surface cover is naturally attached to the strength member by fastening the strength member side bracket and the cover side bracket using the fastening member. In addition, with the outer surface cover attached to the strength member, the strength member side bracket, the cover side bracket, and the fastening member that fastens these brackets can be accommodated between the strength member and the outer surface cover. As a result, the external appearance of the side frame on one side can be maintained by covering each bracket and the fastening member with the outer surface cover.

  According to the invention of claim 3, by providing the connecting arm extending rearward at the inner end portion of the front beam portion constituting the L-shaped strength member, the inner portion of the front beam portion is interposed via the connecting arm. While welding to the vertical plate on one side of the center frame, it is possible to weld to the upper surface of the bottom plate of the center frame. Thereby, a large welding length between the inner portion of the front beam portion and the center frame can be secured, and the strength member can be reliably fixed to the center frame.

  In this case, by welding the connecting arm provided at the inner end of the front beam to the vertical plate on one side of the center frame, the inner end of the front beam is directly welded to the vertical plate on one side. Compared to the case, it is possible to suppress the large vibration from the vertical plate from being transmitted directly to the front beam portion, and to absorb the vibration from the vertical plate by the bending of the connecting arm. As a result, the attachment strength of the one side frame with respect to the center frame can be increased, and the reliability of the entire turning frame can be increased.

  According to the invention of claim 4, the outer surface cover attached to the strength member is constituted by two members of a front outer surface cover extending in the left and right directions and a vertical outer surface cover extending in the front and rear directions. While shortening the length of a cover and a vertical outer surface cover, a shape can be simplified and workability | operativity at the time of manufacturing an outer surface cover can be improved.

1 is a left side view showing a hydraulic excavator to which an embodiment of the present invention is applied. It is the front view which looked at the hydraulic excavator from the cab side. It is a top view which shows the state which mounted an engineon, a fuel tank, a hydraulic-oil tank, a counterweight, etc. on the turning frame. It is a perspective view which shows a turning frame alone. It is a disassembled perspective view which shows a turning frame and an outer surface cover. It is a partially broken exploded perspective view showing a strength member, an outer surface cover, a strength member side bracket, a cover side bracket, and a bolt. It is an enlarged plan view which expands and shows the A section in FIG. It is sectional drawing which looked at a strength member, an outer surface cover, a strength member side bracket, a cover side bracket, and a bolt from arrow VIII-VIII direction in FIG. It is sectional drawing which looked at the right side frame from the arrow IX-IX direction in FIG. It is the front view which looked at the hydraulic excavator by a comparative example from the cab side. It is a perspective view similar to FIG. 4 which shows the turning frame provided with the outer surface cover by 2nd Embodiment. It is a disassembled perspective view similar to FIG. 5 which shows a turning frame, a front outer surface cover, a vertical outer surface cover, etc. It is a disassembled perspective view which shows a front outer surface cover and a vertical outer surface cover. It is sectional drawing which looked at the connection part of a front outer surface cover and a vertical outer surface cover from the arrow XIV-XIV direction in FIG.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the construction machine is applied to a hydraulic excavator having a crawler type lower traveling body.

  First, FIG. 1 thru | or FIG. 9 has shown the 1st Embodiment of this invention. In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. This hydraulic excavator 1 is composed of a self-propelled lower traveling body 2 having left and right crawler belts 2A and an upper revolving body 3 mounted on the lower traveling body 2 so as to be capable of swiveling. A swing type work device 4 is provided on the front side of the upper swing body 3 so as to be swingable left and right via a swing post 4A, and the work device 4 is used for excavating earth and sand. It has a configuration.

  Here, as shown in FIGS. 2 and 3, the upper swing body 3 has a swing frame 11 which will be described later as a base. A counterweight 5 is provided at the rear end side of the swivel frame 11 to balance the weight with the work device 4. The engine 6 is mounted on the front side of the counterweight 5 in a horizontally placed state extending leftward and rightward. ing. On the left side of the front part of the swivel frame 11 is mounted a cab 7 that defines a driver's cab in which an operator is boarded. The cab 7 is surrounded by a front surface 7A, a rear surface 7B, an outer surface 7C, an inner surface 7D, and an upper surface 7E. A cab 7 is provided with a driver's seat, various operation levers and the like (none of which are shown).

  On the other hand, a hydraulic oil tank 8 and a fuel tank 9 as oil storage tanks are mounted side by side in the left and right directions on the opposite side of the revolving frame 11 with the work device 4 sandwiched between the cab 7. Between the fuel tank 9 and the counterweight 5, and between the cab 7 and the counterweight 5, a building cover 10 that houses equipment mounted such as the engine 6 is provided.

  In this case, as shown in FIGS. 2 and 3, the upper swing body 3 has a left and right width dimension substantially equal to the vehicle width of the lower traveling body 2 and is formed in a substantially circular shape when viewed from above. ing. As a result, the hydraulic excavator 1 has a rear small turning type in which the rear surface 5A of the counterweight 5 is substantially within the vehicle width of the lower traveling body 2 when the upper revolving body 3 performs the turning operation on the lower traveling body 2. It is configured as a hydraulic excavator.

  Reference numeral 11 denotes a revolving frame serving as a base of the upper revolving structure 3. The revolving frame 11 forms a strong support structure and is mounted on the lower traveling structure 2 so as to be capable of revolving. Here, the turning frame 11 includes a center frame 12, a left extending beam 19, a right extending beam 20, a left side frame 21, a right side frame 30 and the like which will be described later.

  Reference numeral 12 denotes a center frame disposed at the center of the revolving frame 11 in the left and right directions. As shown in FIGS. 3 and 4, the outer center frame 12 includes a bottom plate 13, a left vertical plate 14, which will be described later, The right vertical plate 15 is generally configured.

  Reference numeral 13 denotes a bottom plate of the center frame 12. The bottom plate 13 is formed using a thick steel plate material and extends in the front and rear directions. Here, a substantially triangular projection 13A is provided on the front end side of the bottom plate 13, and a swing bracket 16 (described later) for swingably supporting the swing post 4A of the work device 4 is attached to the projection 13A. It has a configuration that can be. Further, left and right vertical plates 14 and 15 described later are erected on the upper surface 13B of the bottom plate 13.

  Reference numeral 14 denotes a left vertical plate standing on the bottom plate 13. The left vertical plate 14 is provided on the left side of the upper surface 13B of the bottom plate 13 and extends in the front and rear directions. Here, a bent portion is provided in the middle part in the front and rear direction of the left vertical plate 14, and the interval between the rear side of the left vertical plate 14 and the right vertical plate 15 is the front side of the left vertical plate 14 and the right side. It is set larger than the interval with the vertical plate 15. A rear left projecting beam 19B, which will be described later, is fixed to the outer side surface 14A of the left vertical plate 14. A weight attaching portion 14B for attaching the counterweight 5 is provided at the rear end portion of the left vertical plate 14.

  Reference numeral 15 denotes a right vertical plate which is erected on the bottom plate 13 so as to face the left vertical plate 14, and the right vertical plate 15 is formed by using a single plate material extending in the front and rear directions. It stands on the right side of 13B. A hydraulic oil tank 8 and a fuel tank 9 are disposed between the right vertical plate 15 and a right side frame 30 described later. A right protruding beam 20 (described later) is provided on the outer surface 15A of the right vertical plate 15. It is fixed. A weight attaching portion 15B for attaching the counterweight 5 is provided at the rear end portion of the right vertical plate 15.

  Here, the front end side of the left vertical plate 14 and the front end side of the right vertical plate 15 are bent in a C shape when viewed from above, and the front end portion of the left vertical plate 14 and the front end portion of the right vertical plate 15 are A cylindrical swing bracket 16 extending in the upward and downward directions is fixed. Further, the upper end portion of the left vertical plate 14 and the upper end portion of the right vertical plate 15 are connected to the bottom plate 13 by an upper plate 17 facing upward and downward, and the protrusions 13A of the upper plate 17 and the bottom plate 13 are connected. The swing bracket 16 is sandwiched between the two.

  Reference numeral 18 denotes four engine brackets (only three are shown) provided on the rear side of the center frame 12. Each of these engine brackets 18 is disposed in the vicinity of the left and right vertical plates 14 and 15 at intervals in the front and rear directions and the left and right directions. The engine 6 is attached to each engine bracket 18 via a mount member (not shown), and as shown in FIG. 3, the engine 6 is horizontally placed extending left and right on the left and right vertical plates 14 and 15. Arranged in a state.

  Reference numeral 19 denotes a left overhanging beam provided extending in the left and right directions between the center frame 12 and a left side frame 21 described later. The left overhanging beam 19 is composed of a front left overhanging beam 19A located on the front side in the front and rear directions, and a rear left overhanging beam 19B located on the rear side. Here, the front left projecting beam 19 </ b> A is formed in a thick flat plate shape, and the base end side thereof is fixed to the left end portion of the bottom plate 13 using welding means. Further, the front end side of the front left overhanging beam 19A protrudes leftward from the center frame 12, and is fixed to the left side frame 21 described later using welding means.

  On the other hand, the rear left overhanging beam 19B is formed by bending a plate material thinner than the front left overhanging beam 19A, and its proximal end is welded to the upper surface 13B of the bottom plate 13 and the outer side surface 14A of the left vertical plate 14. It is fixed using means. Further, the front end side of the rear left projecting beam 19B protrudes leftward from the center frame 12, and is fixed to the left side frame 21 described later using welding means. Mounted holes 19C are respectively formed on both left and right ends of the rear left extending beam 19B, and mount members (for mounting the cab 7 in a vibration-proof manner) are mounted in the respective mounted holes 19C. (Not shown) can be attached.

  Reference numeral 20 denotes a right extending beam provided extending in the left and right directions between the center frame 12 and a right side frame 30 described later. The right overhanging beam 20 is located on the front right overhanging beam 20A located on the front side in the front and rear directions, the intermediate right overhanging beam 20B located on the middle portion in the front and rear directions, and the rear side in the front and rear directions. The rear right extending beam 20C is used. Here, the front right overhanging beam 20A, the intermediate right overhanging beam 20B, and the rear right overhanging beam 20C are formed by bending a thin plate material, and the base end sides of the upper surface 13B of the bottom plate 13 and the right vertical plate 15 are formed. It is fixed to the outer side surface 15A using welding means.

  Further, the front end sides of the front right overhanging beam 20A, the intermediate right overhanging beam 20B, and the rear right overhanging beam 20C protrude rightward from the center frame 12, and are fixed to the right side frame 30 described later using welding means. . As shown in FIG. 3, a hydraulic oil tank 8 and a fuel tank 9 are provided adjacent to each other in the left and right directions on the upper surface side of the intermediate right extending beam 20B and the rear right extending beam 20C.

  Next, the left side frame used for the turning frame 11 according to the present embodiment will be described.

  Reference numeral 21 denotes a left side frame as a side frame on one side. The left side frame 21 is attached to the left side of the center frame 12 via a left projecting beam 19 and constitutes the outer peripheral portion on the left side of the revolving frame 11. It is. Here, the left side frame 21 includes a strength member 22 described later and an outer surface cover 25.

  Reference numeral 22 denotes a strength member that constitutes a main part of the left side frame 21, and the strength member 22 is a thick solid material, that is, a rectangular shape extending upward and downward, as shown in FIGS. It consists of a strength member having a cross-sectional shape. In this case, the strength member 22 is located on the front surface 7A side of the cab 7 and extends to the left and right, and bends backward from the left end side of the front beam portion 22A. Is formed in an L shape by a longitudinal beam portion 22B extending in the front and rear directions. On the other hand, a connecting arm 23 described later is provided on the inner end portion (right end portion) 22A1 of the front beam portion 22A.

  A connecting arm 23 is provided at the inner end 22A1 of the front beam portion 22A. The connecting arm 23 connects the front beam portion 22A of the strength member 22 and the left vertical plate 14 of the center frame 12. is there. Here, the connecting arm 23 is composed of a plate body having a bent portion 23A provided in the front and rear intermediate portions, and the front end side thereof is fixed to the inner end portion 22A1 of the front beam portion 22A by welding means. Yes.

  The inner portion of the front beam portion 22A constituting the strength member 22 has the rear end side of the connecting arm 23 fixed to the inner end portion 22A1 fixed to the outer surface 14A of the left vertical plate 14 by welding means. The lower end portion of the front beam portion 22A is fixed to the upper surface 13B of the bottom plate 13 by welding means. On the other hand, the longitudinal beam portion 22B constituting the strength member 22 uses welding means for the front end portion of the front left overhanging beam 19A protruding from the center frame 12 to the left side and the front end portion of the rear left overhanging beam 19B, respectively. It is fixed.

  Thus, the strength member 22 constituting the left side frame 21 has the front beam portion 22A fixed to the outer side surface 14A of the left vertical plate 14 and the upper surface 13B of the bottom plate 13 using welding means, and the vertical beam portion 22B is The front left extended beam 19A and the rear left extended beam 19B are firmly bonded to the center frame 12 by being fixed to the front end portions using welding means. In this case, a connecting arm 23 is provided on the inner end 22A1 of the front beam portion 22A, and the inner end 22A1 of the front beam 22A is directly connected to the left vertical plate 14 by welding the connecting arm 23 to the left vertical plate 14. As compared with the case where the welding is mechanically performed, it is possible to suppress a large vibration from the left vertical plate 14 from being directly transmitted to the front beam portion 22 </ b> A and to absorb the vibration from the left vertical plate 14 by the bending of the connecting arm 23. It can be configured.

  Reference numeral 24 denotes a plurality of (for example, four) strength member side brackets provided on the outer surface 22 </ b> C of the strength member 22, and each of the strength member side brackets 24 is a bolt 27 for attaching an outer surface cover 25 to be described later to the strength member 22. Is inserted. Here, as shown in FIG. 6 and FIG. 8, each strength member side bracket 24 is formed by bending a steel plate material or the like into an inverted U shape, and is welded to the outer side surface 22 </ b> C of the strength member 22 at an appropriate interval. Has been. Each of the strength member side brackets 24 has a mounting surface 24A extending in the horizontal direction in a state of being attached to the strength member 22, and a bolt insertion hole 24B is formed in a central portion of the mounting surface 24A.

  Reference numeral 25 denotes an outer surface cover attached to the strength member 22, and the outer surface cover 25 constitutes an outer surface of the left side frame 21. The outer cover 25 is formed into an L shape similar to the strength member 22 as a whole by bending a thin plate material, and covers the outer side surface 22C of the strength member 22 so that the left side frame 21 It enhances the appearance beauty. Here, the outer surface cover 25 is an upper surface plate 25A that forms substantially the same plane as the upper surface 22D of the strength member 22, and a side that is bent downward from the upper surface plate 25A and faces the outer surface 22C of the strength member 22 with a gap. And a face plate 25B. Further, on the inner side surface 25C located on the strength member 22 side of the outer surface cover 25, each cover side bracket 26 described later is provided.

  Reference numeral 26 denotes a plurality of (for example, four) cover side brackets provided on the inner side surface 25 </ b> C of the outer surface cover 25, and each cover side bracket 26 corresponds to each strength member side bracket 24 provided on the strength member 22. It is arranged in four places. Here, as shown in FIGS. 6 and 8, each cover side bracket 26 is formed by bending a steel plate material or the like into a U-shape, and the inner side surface 25C of the outer surface cover 25 (below the upper surface plate 25A). It is welded to. Each of the cover side brackets 26 has a mounting surface 26A extending in the horizontal direction in a state of being attached to the outer surface cover 25, and a female screw member 26B such as a nut is fixed to the upper surface side of the central portion of the mounting surface 26A. Yes.

  Reference numeral 27 denotes a plurality of (for example, four) bolts as fastening members for attaching the outer surface cover 25 to the strength member 22. As shown in FIG. 6, each of these bolts 27 is inserted upward from below into a bolt insertion hole 24 </ b> B of a strength member side bracket 24 provided on the strength member 22, and a female screw of a cover side bracket 26 provided on the outer surface cover 25. It is screwed to the member 26B.

  Therefore, as shown in FIG. 8, the inner surface 25C of the outer cover 25 abuts on the upper surface 22D of the strength member 22, and the upper surface 22D of the strength member 22 and the upper surface plate 25A of the outer cover 25 form substantially the same plane. Thus, the outer surface cover 25 can be attached to the strength member 22 by fastening the strength member side bracket 24 and the cover side bracket 26 with the bolts 27, and the left side frame 21 composed of the strength member 22 and the outer surface cover 25 is provided. It is formed.

  In this case, since the strength member side bracket 24 is provided on the outer side surface 22C of the strength member 22 and the cover side bracket 26 is provided on the inner side surface 25C of the outer surface cover 25, the strength member side bracket 24 and the cover side bracket 26 are provided. In addition, the bolts 27 for fastening the brackets 24 and 26 can be accommodated between the strength member 22 and the outer surface cover 25.

  Next, 28 indicates a left front cab support plate provided at a corner where the front beam portion 22A and the vertical beam portion 22B of the strength member 22 intersect. The left front cab support plate 28 includes the front beam portion 22A and the front beam portion 22A. It is fixed to the inner surface of the vertical beam portion 22B using welding means. On the other hand, 29 indicates a right front cab support plate provided between the front beam portion 22A of the strength member 22 and the left vertical plate 14, and the right front cab support plate 29 is provided on the front beam portion 22A of the strength member 22. The inner side surface and the outer side surface 14A of the left vertical plate 14 are fixed using welding means.

  Here, the left front cab support plate 28 and the right front cab support plate 29 are provided with mount mounting holes 28A and 29A for mounting mount members (not shown) for supporting the cab 7 in a vibration-proof manner. Yes. Therefore, the cab 7 is configured to be supported by the rear left protruding beam 19B, the left front cab support plate 28, and the right front cab support plate 29 via the mount member.

  Next, reference numeral 30 denotes a right side frame as the other side frame. The right side frame 30 is attached to the right side of the center frame 12 via the right extending beam 20, and the right outer frame portion of the swivel frame 11 is attached to the right side frame. It constitutes. Here, as shown in FIGS. 3 and 9, the right side frame 30 is formed using a hollow cylindrical body, and extends in the front and rear directions from the front right overhanging beam 20A to the rear right overhanging beam 20C. It extends.

  In this case, the right side frame 30 is formed by using a thin plate material and is arranged on the center frame 12 side, and an outer plate 30B formed by bending a thin plate material than the inner plate 30A. Are joined using welding means to form a cylindrical body whose inside is a closed cross-sectional space 30C. Then, the front end portion of the right side frame 30 is fixed to the front end portion of the front right overhanging beam 20A using welding means, and the right side frame 30 is attached to the front end portions of the intermediate right overhanging beam 20B and the rear right overhanging beam 20C. The right side frame 30 is firmly joined to the center frame 12 by fixing the inner surface plate 30A using welding means.

  Here, as shown in FIGS. 8 and 9, the height dimension of the strength member 22 constituting the left side frame 21 is A, and the height dimension of the right side frame 30 formed as a hollow cylindrical body is B. Then, these height dimensions A and B have the relationship of the following formula 1.

  Thus, by forming the left side frame 21 using the strength member 22 made of a solid material, the height side A of the strength member 22 is set to a right side frame 30 formed using a hollow cylindrical body. The height dimension B can be made smaller.

  Accordingly, as shown in FIG. 2, the height dimension between the lower end 2A1 of the crawler belt 2A constituting the lower traveling body 2 and the upper surface 21A of the left side frame 21 (the upper surface of the upper surface plate 25A of the outer cover 25) is set. When C is C and D is a height dimension between the lower end 2A1 of the crawler belt 2A constituting the lower traveling body 2 and the upper surface 30D of the right side frame 30, these height dimensions C and D are expressed by the following equation (2). Become.

  Thus, the height dimension C between the lower end 2A1 of the crawler belt 2A and the upper surface 21A of the left side frame 21 is the height dimension D between the lower end 2A1 of the crawler belt 2A and the upper surface 30D of the right side frame 30. Is set to be smaller than ΔC, the height dimension E between the lower end portion 2A1 of the crawler belt 2A and the upper surface 7E of the cab 7 in the state where the cab 7 is mounted on the left side frame 21, that is, the cab 7 It is the structure which can suppress the ground height of the upper surface 7E low.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the left side frame 21 on which the cab 7 is mounted is formed by using a strength member 22 made of a thick solid material, and a hydraulic oil tank The right side frame 30 on which the fuel tank 8 and the fuel tank 9 are mounted is formed using a hollow cylindrical body having a closed cross-sectional space 30C inside. For this reason, by increasing the thickness of the strength member 22, the strength of the left side frame 21 can be increased, and the cab 7 can be stably supported.

  In this case, since the left side frame 21 is formed by using the strength member 22 made of a solid material, the closed cross-sectional space 30C formed inside is increased upward and downward like the right side frame 30. There is no need to increase its strength. Therefore, as shown in FIGS. 8 and 9, the height dimension A of the strength member 22 can be made smaller than the height dimension B of the right side frame 30.

  Thereby, the hydraulic excavator 1 according to the present embodiment has a height dimension C between the lower end 2A1 of the crawler belt 2A constituting the lower traveling body 2 and the upper surface 21A of the left side frame 21, as shown in FIG. The height C between the lower end 2A1 of the crawler belt 2A constituting the lower traveling body 2 and the upper surface 30D of the right side frame 30 can be set smaller by ΔC. As a result, the height dimension E between the lower end 2A1 of the crawler belt 2A and the upper surface 7E of the cab 7 can be kept low with the cab 7 mounted on the left side frame 21.

  Next, a comparison between the excavator 1 according to the present embodiment shown in FIG. 2 and the excavator 101 according to the comparative example shown in FIG. 10 will be described.

  First, a hydraulic excavator 101 according to a comparative example includes a lower traveling body 2 similar to the hydraulic excavator 1 according to the present embodiment, and an upper revolving body 102 that is turnably mounted on the lower traveling body 2. The upper swing body 102 has a swing frame 103 as a base, and a cab 7 similar to that of the hydraulic excavator 1 according to the present embodiment is provided on the left side of the front portion of the swing frame 103.

  Here, the turning frame 103 according to the comparative example includes a center frame 104 similar to the turning frame 11 applied to the present embodiment, and the right side frame 30. However, the left side frame 105 of the turning frame 103 according to the comparative example is formed using a hollow cylindrical body similar to the right side frame 30, and the right side frame 30 and the left side frame 105 have the same height dimension B. have.

  Accordingly, the hydraulic excavator 101 according to the comparative example includes a height dimension between the lower end 2A1 of the crawler belt 2A constituting the lower traveling body 2 and the upper surface 30D of the right side frame 30, and the lower end 2A1 of the crawler belt 2A and the left side frame. The height dimension between the upper surface 105A of 105 and the upper surface 105A is equal to the height dimension D. When the cab 7 is mounted on the left side frame 105, the upper surface 7E of the cab 7 and the lower end 2A1 of the crawler belt 2A The height in between is the height dimension F.

  On the other hand, in the hydraulic excavator 1 according to the present embodiment, the left side frame 21 is formed by using the strength member 22 made of a solid material, and as shown in FIG. 2, the lower end 2A1 of the crawler belt 2A and the left The height dimension C between the upper surface 21A of the side frame 21 can be made smaller by ΔC than the height dimension D between the lower end 2A1 of the crawler belt 2A and the upper surface 30D of the right side frame 30.

  For this reason, when the cab 7 is mounted on the left side frame 21, the hydraulic excavator 1 of the present embodiment has a height dimension E between the upper surface 7E of the cab 7 and the lower end 2A1 of the crawler belt 2A. The hydraulic excavator 101 according to the comparative example is smaller than the height dimension F between the upper surface 7E of the cab 7 and the lower end 2A1 of the crawler belt 2A by ΔC.

  As a result, when the excavator 101 according to the comparative example is loaded on a shipping container (not shown), the upper end side of the cab 7 may interfere with the ceiling portion of the container, whereas the hydraulic pressure according to the present embodiment. When the excavator 1 is loaded on the container for transportation, it is possible to prevent the upper end side of the cab 7 from interfering with the ceiling portion of the container, and the hydraulic excavator 1 can be reliably loaded on the container for transportation.

  Moreover, according to the present embodiment, the strength member 22 can be covered from the outside by the outer surface cover 25 by attaching the outer surface cover 25 to the strength member 22. As a result, the appearance of the left side frame 21 can be maintained by the outer surface cover 25 while the strength of the left side frame 21 is increased by the strength member 22.

  In this case, the strength member side bracket 24 for attaching the outer surface cover 25 is provided on the outer side surface 22 </ b> C of the strength member 22, and the cover side bracket 26 is provided on the inner side surface 25 </ b> C of the outer surface cover 25. For this reason, the strength member side bracket 24, the cover side bracket 26, and the bolt 27 for fastening the strength member side bracket 24 and the cover side bracket 26 are accommodated between the strength member 22 and the outer surface cover 25. The appearance beauty of the left side frame 21 can be enhanced.

  Furthermore, according to the present embodiment, the strength member 22 is positioned on the front surface 7A side of the cab 7 and extends in the left and right directions, the front beam portion 22A, and the front and rear directions along the outer surface 7C of the cab 7. The connecting beam 23 is provided on the inner end 22A1 of the front beam 22A. The connecting arm 23 extends rearward from the inner end 22A1. Then, the inner portion of the front beam portion 22A is welded to the left vertical plate 14 of the center frame 12 via the connecting arm 23, and is also welded to the upper surface 13B of the bottom plate 13, so that the inner portion of the front beam portion 22A and the center portion are centered. A large welding length with the frame 12 can be ensured, and the strength member 22 can be securely fixed to the center frame 12.

  Moreover, by welding the connecting arm 23 provided at the inner end 22A1 of the front beam portion 22A to the left vertical plate 14 of the center frame 12, the inner end 22A1 of the front beam portion 22A is directly connected to the left vertical plate 14. As compared with the case where welding is performed, the large vibration from the left vertical plate 14 can be prevented from being directly transmitted to the front beam portion 22A, and the vibration from the left vertical plate 14 can be absorbed by the bending of the connecting arm 23. . As a result, the mounting strength of the left side frame 21 with respect to the center frame 12 can be increased, and the reliability of the entire turning frame 11 can be increased.

  Next, FIGS. 11 to 14 show a second embodiment of the present invention. The feature of this embodiment is that an outer surface cover attached to a strength member is divided into two members, a front outer surface cover and a vertical outer surface cover. It is in the configuration. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  Reference numeral 31 denotes a revolving frame that serves as a base of the upper revolving structure 3. The revolving frame 31 is used in this embodiment instead of the revolving frame 11 used in the first embodiment. Here, similarly to the turning frame 11 according to the first embodiment, the turning frame 31 includes a center frame 12, a left extension beam 19, a right extension beam 20, a right side frame 30, a left side frame 32 described later, and the like. Has been.

  Reference numeral 32 denotes a left side frame as a side frame on one side, and the left side frame 32 constitutes an outer peripheral portion on the left side of the revolving frame 31. Here, the left side frame 32 is substantially constituted by a strength member 22 and a front outer surface cover 33 and a vertical outer surface cover 34, which will be described later, in substantially the same manner as the left side frame 21 according to the first embodiment. The configurations of the front outer cover 33 and the vertical outer cover 34 are different from those of the outer cover 25 according to the first embodiment.

  Reference numeral 33 denotes a front outer surface cover attached to the strength member 22, and the front outer surface cover 33 constitutes an outer surface of the left side frame 32 together with a vertical outer surface cover 34 described later. The front outer surface cover 33 is formed by bending a thin plate material, and is located on the front surface 7A side of the cab 7 shown in FIG. 2, and moves left and right along the front beam portion 22A of the strength member 22. It extends linearly.

  Here, the front outer surface cover 33 is bent downward from the upper surface plate 33A that forms substantially the same plane as the upper surface 22D of the strength member 22, and faces the outer surface 22C of the strength member 22 with a gap. It is comprised by the side plate 33B. On the other hand, two cover side brackets 26 are provided on the inner side surface 33C located on the strength member 22 side of the front outer surface cover 33, and each of these cover side brackets 26 is fixed to the front beam portion 22A of the strength member 22. It is attached to the strength member side bracket 24 using bolts 27. Further, a connecting end 33D having a similar shape that is slightly smaller than the front outer surface cover 33 is provided at the left end of the front outer surface cover 33.

  Reference numeral 34 denotes a longitudinal outer surface cover attached to the strength member 22 together with the front outer surface cover 33. The vertical outer surface cover 34 is formed by bending a thin plate material and is detachably connected to the connection end portion 33D of the front outer surface cover 33. The vertical outer surface cover 34 is bent rearward from the connection end portion 33D of the front outer surface cover 33 along the vertical beam portion 22B of the strength member 22, and is moved forward along the outer surface 7C of the cab 7 shown in FIG. , Extends backwards.

  Here, the vertical outer surface cover 34 is bent downward from the upper surface plate 34A, which forms substantially the same plane as the upper surface 22D of the strength member 22, and faces the outer surface 22C of the strength member 22 with an interval. It is comprised by the side plate 34B. On the other hand, three cover side brackets 26 are provided on the inner side surface 34 </ b> C located on the strength member 22 side of the longitudinal outer surface cover 34, and each of these cover side brackets 26 is connected to the front beam portion 22 </ b> A of the strength member 22. A bolt 27 is attached to the strength member side bracket 24 fixed to the beam portion 22B.

  At this time, the connection end portion 33D of the front outer surface cover 33 is fitted into the front end portion of the vertical outer surface cover 34, whereby the front outer surface cover 33 and the vertical outer surface cover 34 are integrally connected to each other. The face plate 33A and the upper surface plate 34A of the vertical outer surface cover 34 form the same plane, and the side plate 33B of the front outer surface cover 33 and the side plate 34B of the vertical outer surface cover 34 form the same plane.

  The left side frame 32 according to the second embodiment is a structure in which an outer surface cover composed of two members, the front outer surface cover 33 and the vertical outer surface cover 34 as described above, is individually attached to the strength member 22 and integrated. As for the basic action, there is no particular difference from that according to the first embodiment.

  However, according to the second embodiment, the outer surface cover attached to the strength member 22 is connected to the front outer surface cover 33 extending leftward and rightward and the front outer surface cover 33 and extending vertically frontward and rearward. The outer surface cover 34 and the two members are used.

  Therefore, the lengths of the front outer surface cover 33 and the vertical outer surface cover 34 can be shortened, and the shapes of the front outer surface cover 33 and the vertical outer surface cover 34 can be simplified. As a result, it is possible to improve workability when separately manufacturing the two members of the front outer surface cover 33 and the vertical outer surface cover 34, and it is possible to contribute to the reduction of the manufacturing cost.

  In the embodiment described above, in the hydraulic excavator 1 in which the cab 7 is mounted on the left side of the front portion of the revolving frame 11, the left side frame 21 is formed using the strength member 22 made of a thick solid material. Is illustrated. However, the present invention is not limited to this. For example, when a cab is provided on the right side of the front portion of the swivel frame, the right side frame of the swivel frame is formed by using a thick solid material. Also good.

  In the above-described embodiment, the hydraulic excavator 1 including the crawler type lower traveling body 2 is described as an example 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 other construction machines such as a hydraulic crane.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 2A1 Lower end part 3 Upper turning body 4 Working device 7 Cab 8 Hydraulic oil tank (oil storage tank)
9 Fuel tank (oil storage tank)
11, 31 Rotating frame 12 Center frame 13 Bottom plate 13B Top surface 14 Left vertical plate 15 Right vertical plate 19 Left overhanging beam 20 Right overhanging beam 21, 32 Left side frame (side frame on one side)
21A Upper surface 22 Strength member 22A Front beam portion 22A1 Inner end 22B Vertical beam portion 23 Connecting arm 24 Strength member side bracket 25 Outer surface cover 26 Cover side bracket 27 Bolt (fastening member)
30 Right side frame (the other side frame)
30D Upper surface 33 Front outer surface cover 33D Connection end (end)
34 Vertical outer cover

Claims (4)

A self-propelled lower traveling body, and an upper revolving body having a revolving frame mounted on the lower traveling body so as to be capable of swiveling, and having a working device provided on the revolving frame,
The revolving frame of the upper revolving structure includes a center frame that is disposed in the center in the left and right directions and extends in the front and rear directions, and left and right side frames that are provided on both the left and right sides across the center frame. A left and right extended beam provided between the center frame and the left and right side frames,
A cab defining a cab is provided between the side frame on one side of the left and right side frames and the center frame,
In a construction machine comprising an oil storage tank for storing fuel and / or hydraulic oil between the side frame on the other side of the left and right side frames and the center frame,
The side frame on the one side is formed using a strength member made of a thick solid material,
The other side frame is formed using a hollow cylindrical body,
The height dimension between the lower end of the lower traveling body and the upper surface of the one side frame is set lower than the height dimension between the lower end of the lower traveling body and the upper surface of the other side frame. And
A construction machine characterized in that an outer surface cover formed using a thin plate material is attached to the strength member using a fastening member. A strength member side bracket is provided on the outer side surface of the strength member, and a cover side bracket is provided on the inner side surface of the outer surface cover,
The construction machine according to claim 1, wherein the outer surface cover is attached to the strength member by fastening the strength member side bracket and the cover side bracket using the fastening member. The center frame is composed of a bottom plate and left and right vertical plates standing on the bottom plate and extending in the front and rear directions,
The strength member is located on the front side of the cab and extends in the left and right directions, and a vertical beam portion that is bent from the front beam and extends in the front and rear directions along the outer surface of the cab. Formed as an L-shaped strength member,
A connecting arm extending rearward from the inner end is provided at the inner end of the front beam, and the inner portion of the front beam is one side of the left and right vertical plates via the connection arm. And fixed to the vertical plate by welding means, and fixed to the upper surface of the bottom plate by welding means,
The construction machine according to claim 1 or 2, wherein the vertical beam portion is configured to be fixed to one of the left and right overhanging beams by welding means.   The outer surface cover is located on the front side of the cab and extends left and right and a front outer surface cover that is connected to an end of the front outer surface cover and extends in the front and rear directions along the outer surface of the cab. The construction machine according to claim 1, 2, or 3, comprising two members with an outer cover.

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