JP5474725B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a protection member for protecting an operator seated in a driver's seat.

  In general, a hydraulic excavator, which is a representative example of a construction machine, is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and can be raised and raised on the front side of the upper revolving body. The work device is generally configured, and the work device is moved up and down while turning the upper turning body to perform excavation work of earth and sand.

  Here, the upper swing body has a swing frame in which a working device is attached on the front side and a counterweight is provided on the rear side. On the swivel frame, mounted devices such as an engine, a hydraulic pump, and a fuel tank are mounted on the front side of the counterweight, and these mounted devices are covered with an engine cover.

  In addition, as a small hydraulic excavator with a small bucket capacity, a driver's seat on which the operator is seated is provided on the engine cover, and a protective member (protective bar) for protecting the operator seated on the driver's seat is supported on the rear side of the counterweight. A structure that supports a bracket (movable bracket) is known (for example, see Patent Document 1).

  In the hydraulic excavator provided with such a protective member, the height of the entire hydraulic excavator is increased by the height of the protective member, and the transportation height and storage height of the hydraulic excavator are increased accordingly. In view of this, in the hydraulic excavator disclosed in Patent Literature 1, the support member constituting the protection member is configured to be foldable so that, for example, the height of the protection member can be reduced during transportation or storage.

  On the other hand, the excavator is configured so that the support position of the support pillar (canopy) can be changed upward and downward so that the height of the protection member can be lowered during transportation or storage, for example. A thing is also known (for example, refer patent document 2).

JP 2008-214887 A Japanese Utility Model Publication No. 3-88820

  Since the hydraulic excavator disclosed in Patent Document 1 is configured to be foldable, the structure of the support becomes complex and the number of parts may increase.

  The hydraulic excavator disclosed in Patent Document 2 has a problem that when the height of the protective member is lowered, the operating lever is covered by the protective member, and therefore the hydraulic excavator cannot be run.

  The present invention has been made in view of the above-described problems of the prior art, can change the height of the protective member with a simple configuration, and can travel even when the height of the protective member is lowered. The purpose is to provide construction machinery.

  In order to solve the above-described problems, the present invention is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. The upper revolving body includes a revolving frame in which the working device is mounted on the front side and a counterweight is provided on the rear side, and the revolving frame located on the front side of the counterweight An engine provided on the engine cover, an engine cover covering the engine from above, a driver seat on the engine cover on which an operator is seated, a support bracket provided on the rear side of the counterweight, and a base end side supporting the engine Protects an operator seated in the driver's seat by having left and right struts supported by brackets and a connecting portion that connects the front end sides of each strut to each other It is applied to a construction machine comprising a protection member.

The feature of the configuration adopted by the invention of claim 1 is that the support bracket is in a state where the left and right struts are vertically arranged so that the connecting portion of the protection member is located above the operator. The left and right vertical support portions to be supported, and the left and right horizontal support portions to be supported in a state in which each support column and the connecting portion of the protective member are laid down in the horizontal direction, the support bracket includes: A lower plate extending in the right direction; an upper plate spaced apart above the lower plate; and between the lower plate and the upper plate located on the left and right sides of the lower plate and the upper plate. The left and right vertical support portions, which are provided and the left and right struts are vertically inserted, are provided on the upper plate and located on the left and right sides of the lower plate and the upper plate. is in the left, the left right strut consists cylindrical body which is inserted transversely, by being configured by the lateral supports of the right

According to a second aspect of the present invention, the connecting portion of the protective member extends from the left and right struts toward the driver's seat so that the protective member forms a canopy that protects the upper and rear sides of the driver's seat. There is.

According to the first aspect of the present invention, the protective member can be supported in the vertical direction by the left and right vertical support portions, and the protective member is laid in the horizontal direction by the left and right horizontal support portions. Therefore, the height of the protective member can be changed with a simple configuration. In addition, when the protective member is supported by being laid down by the left and right lateral support portions, the protective member can be configured not to interfere with the driver's seat, the operation lever, etc. The construction machine can be run even when the value is lowered. For this reason, it is possible to run the construction machine in a place where the ceiling height is lower than that of the prior art, and it is possible to improve the running performance and workability of the construction machine.
In addition, since the left and right vertical support portions and the left and right horizontal support portions are constituted by the cylindrical body through which the support member support pillars are inserted, the vertical support portions stabilize the protection members in the vertical direction. The protection member can be stably supported in the lateral direction by each lateral support portion. Thereby, the support strength of the protection member with respect to a support bracket can be improved, and the reliability of a protection member can be improved.

According to the second aspect of the present invention, since the protective member is constituted by a canopy that protects the upper side and the rear side of the driver's seat, the operator seated on the driver's seat can be covered (protected) in a wider range.

It is a front view which shows the hydraulic shovel applied to the 1st Embodiment of this invention in the state which stood the protection member. It is a front view which shows the hydraulic excavator when the protection member is stood up with the engine cover opened. It is a left view which omits a working device and shows a hydraulic excavator when a protection member is stood. It is a top view which abbreviate | omits a working device and shows the hydraulic shovel when standing up a protection member. It is a front view which shows the hydraulic shovel when sleeping a protection member. It is a left view which omits a working device and shows a hydraulic excavator when a protection member is laid down. It is a top view which abbreviate | omits a working device and shows the hydraulic excavator when a protective member is laid down. It is a disassembled perspective view which shows a counterweight, a support bracket, etc. It is a disassembled perspective view which shows this protection member, support bracket, etc. when raising a protection member. It is a disassembled perspective view which shows this protection member, a support bracket, etc. when laying down a protection member. It is a front view which shows the hydraulic shovel by the 2nd Embodiment of this invention in the state which stood the protection member. It is a front view which shows the hydraulic shovel when sleeping a protection member. It is a disassembled perspective view similar to FIG. 9 which shows a protection member, a support bracket, etc. FIG. 10 is an exploded perspective view similar to FIG. 9 showing a protection member, a support bracket and the like according to a modification of the present invention.

  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 small hydraulic excavator called an ultra mini excavator.

  1 to 10 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. And a swing post type working device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down.

  Here, the upper swing body 3 is configured to be very compact so as to smoothly perform a swing operation in a narrow work site. The upper swing body 3 includes a swing frame 5, an engine 8, an engine cover 10, a driver's seat 11, an operation lever device 12, a support bracket 13, a canopy 23, and the like, which will be described later.

  Reference numeral 5 denotes a revolving frame that serves as a base of the upper revolving structure 3. The revolving frame 5 forms a strong support structure, and is integrally formed by casting, for example. Here, a bracket 6 that supports the swing post 4 </ b> A of the working device 4 so as to be swingable in the left and right directions is provided on the front side of the turning frame 5, and the working device is attached to the turning frame 5 through the bracket 6. 4 is attached.

  Reference numeral 7 denotes a counterweight formed integrally with the revolving frame 5 and disposed on the rear side of the revolving frame 5, and the counterweight 7 balances the weight with the work device 4. Here, the counterweight 7 is formed as a thick and heavy curved plate, rises substantially vertically from the rear end portion of the revolving frame 5, and the left and right intermediate portions protrude rearward. It has a substantially arc shape.

  Further, as shown in FIG. 8 and the like, a later-described support bracket 13 is detachably attached to the rear surface 7A side of the counterweight 7. For this purpose, screw holes 7C and 7D for screwing bolts 15 and 18 for fixing the support bracket 13 to the counterweight 7 are provided on the rear surface 7A and the lower surface 7B of the counterweight 7.

  Reference numeral 8 denotes an engine provided on the revolving frame 5 on the front side of the counterweight 7, and the engine 8 is arranged in a horizontal state extending in the left and right directions. For example, a hydraulic pump (not shown) is attached to the right side of the engine 8, and the hydraulic pump discharges operating hydraulic fluid to a hydraulic actuator mounted on the hydraulic excavator 1. Further, for example, a radiator 9 that cools cooling water or the like of the engine 8 is provided on the left side of the engine 8, and a fuel tank (not shown) that stores fuel supplied to the engine 8 is provided on the left front side of the engine 8. Is installed.

  An engine cover 10 is provided on the revolving frame 5 so as to cover the engine 8, the hydraulic pump, the radiator 9, the fuel tank, and the like from above. The engine cover 10 is formed as a prone cover having high strength. . Here, the rear lower side of the engine cover 10 is rotatably attached to the counterweight 7 of the turning frame 5 via a hinge mechanism or the like, for example.

  As a result, the engine cover 10 is opened and closed in the front and rear directions between the closed position shown in FIG. 1 and the open position shown in FIG. During operation, the engine is held in the closed position and covers the engine 8, the hydraulic pump, the radiator 9, the fuel tank, and the like. On the other hand, when performing maintenance work of the engine 8 and the like, fuel supply work to the fuel tank, etc., the engine cover 10 is rotated so that the front side is tilted backward with the rear side as the center, as shown in FIG. The engine 8, the hydraulic pump, the radiator 9, the fuel tank and the like can be easily exposed to the outside by rotating to the open position.

  A driver's seat 11 is provided on the upper surface side of the engine cover 10, and the driver's seat 11 is seated by an operator who operates the excavator 1. An operator seated in the driver's seat 11 is protected by a canopy 23 described later when operating (driving) the hydraulic excavator 1.

  An operation lever device 12 is provided on the front side of the revolving frame 5 and is located on the front side of the engine cover 10. The operation lever device 12 is operated by an operator seated on the driver's seat 11. The operation lever device 12 includes a lever stand 12A erected on the front side of the revolving frame 5, and left and right work operation levers provided on the upper portion of the lever stand 12A so as to be separated in the left and right directions. 12B and a left and right traveling operation lever 12C provided between the respective operation operation levers 12B.

  Next, the support bracket 13 for supporting the canopy 23 will be described.

  That is, 13 is a support bracket provided on the rear surface 7A side of the counterweight 7, and the support bracket 13 supports a canopy 23, which will be described later, in a standing state and in a lying state. Here, as shown in FIG. 8 and the like, the support bracket 13 includes a lower plate 14, an upper plate 16, a connecting plate 17, left and right vertical support portions 19, and left and right horizontal support portions. The lower plate 14, the upper plate 16, the connecting plate 17, the left and right vertical support portions 19, and the left and right horizontal support portions 21 are joined to each other using welding means or the like. .

  Reference numeral 14 denotes a flat plate-like lower plate extending in the left and right directions and having the front end side fixed to the lower surface 7B of the counterweight 7. Here, the lower plate 14 is formed of, for example, a metal plate such as a steel plate, and the lower plate 14 includes left and right fixed bracket portions 14A located on both sides in the left and right directions, and the fixed bracket portions 14A. A recess 14B that is located in between and recessed toward the rear side, and an escape portion 14C that is located at the left corner of the recess 14B and that escapes from the muffler of the engine 8 are provided.

  The fixed bracket portion 14A has left and right elongated holes 14D that are long in the front and rear directions. Bolts 15 screwed into screw holes 7C provided in the lower surface 7B of the counterweight 7 are inserted into the long holes 14D, and the lower plate 14 is fixed to the lower surface 7B of the counterweight 7 using the bolts 15. It is the composition to do.

  Reference numeral 16 denotes a flat plate-like upper plate that is spaced apart from the upper side of the lower plate 14 and extends in the left and right directions with the front end curved along the rear surface 7A of the counterweight 7. Here, similarly to the lower plate 14, the upper plate 16 is also formed of a metal plate such as a steel plate. Further, through holes 16A serving as openings of the left and right vertical support portions 19 described later are provided on both left and right sides of the upper plate 16, and the through holes 16A are sandwiched in the front and rear directions. The left and right lateral support portions 21, which will be described later, are joined using welding means. Further, on the lower side of the front support portion 21A constituting the left and right lateral support portions 21 of both the left and right sides of the upper plate 16, bolt insertion corresponding to the bolt insertion holes 21A1 of the front support portion 21A. A hole (not shown) is provided.

  Reference numeral 17 denotes a connecting plate provided between the lower plate 14 and the upper plate 16. The connecting plate 17 is welded to the lower surface of the upper plate 16 at the upper end side and welded to the upper surface of the lower plate 14. The upper plate 16 and the lower plate 14 are connected to each other. Here, the connecting plate 17 is formed to have a substantially U-shaped cross section by bending a metal plate such as a steel plate. Then, left and right cylindrical bodies 17A are provided on both left and right ends of the connecting plate 17 so as to extend in the front and rear directions. Bolts 18 to be screwed into screw holes 7D provided on the rear surface 7A of the counterweight 7 are inserted into the cylindrical bodies 17A, and the connecting plate 17 is moved to the rear surface 7A side of the counterweight 7 using the bolts 18. The configuration is fixed.

  Reference numeral 19 denotes left and right vertical support portions provided on the left and right sides of the lower plate 14 and the upper plate 16 and provided between the lower plate 14 and the upper plate 16. The canopy 23 described later is supported in an upright state. That is, as shown in FIGS. 1 to 4, 9, and the like, the vertical support portion 19 is positioned on the canopy 23 so that the U-shaped connecting portion 25 of the canopy 23 is positioned above the operator seated on the driver's seat 11. The left and right struts 24 are supported in a vertical state (upward and downward).

  For this purpose, the vertical support portion 19 is formed as a cylindrical body that passes through each column 24 of the canopy 23 in the vertical direction, more specifically, as a metallic tubular member (cylindrical member) such as a steel pipe, and the upper plate 16. Are disposed concentrically with the through-hole 16A. A pair of bolt insertion holes 19 </ b> A are provided on the lower side of the vertical support portion 19 so as to face each other in the radial direction. As shown in FIG. 9 and the like, bolts 20 for fixing the base end sides of the support posts 24 of the canopy 23 are inserted into the bolt insertion holes 19A. The nut 20A is screwed.

  21 are left and right lateral support portions which are provided on the upper surface of the upper plate 16 so as to be positioned on both left and right sides of the upper plate 16, and each lateral support portion 21 is a state in which a later-described canopy 23 is laid down. It is something to support. That is, as shown in FIGS. 5 to 7, 10, etc., the lateral support portion 21 lays the left and right struts 24 and the U-shaped connecting portion 25 of the canopy 23 in the lateral direction (front and rear directions). It supports in a state.

  Here, the lateral support portion 21 is constituted by a front support portion 21A and a rear support portion 21B that are spaced apart in the front and rear directions across the through hole 16A on the upper surface of the upper plate 16, respectively. The portions 21A and 21B are formed as cylindrical bodies that pass through the respective struts 24 of the canopy 23 in the lateral direction, more specifically, as metal tubular members (cylindrical members) such as steel pipes.

  Of the front and rear support portions 21A and 21B, the front support portion 21A is provided with a pair of bolt insertion holes 21A1 facing the radial direction, and the upper plate 16 is concentrically with the bolt insertion hole 21A1. Bolt insertion holes are provided. As shown in FIG. 10 and the like, bolts 22 for fixing the distal end sides of the support posts 24 of the canopy 23 are inserted into the bolt insertion holes 21A1. The nut 22 </ b> A is screwed from the lower surface side of the upper plate 16.

  Reference numeral 23 denotes a canopy as a protective member that protects an operator seated on the driver's seat 11, and the canopy 23 is generally constituted by left and right struts 24 and a U-shaped connecting portion 25 described later. Here, as shown in FIG. 9 and the like, the canopy 23 integrates the left and right support columns 24 and the U-shaped connecting portion 25 by bending a metal tubular material such as a steel pipe. It is comprised as the frame formed in.

  Reference numerals 24 are left and right struts whose base ends are supported by the support bracket 13, and each of the struts 24, for example, when the hydraulic excavator 1 is operated in a place where the ceiling height is high is shown in FIGS. As shown in FIG. 5 and the like, when the hydraulic excavator 1 is operated in a place where the vertical height is low and the hydraulic excavator 1 is stored or transported in a place where the ceiling height is low, for example, FIG. As shown in FIGS. 7, 10, etc., it is supported by the lateral support portion 21 in a state of being laid down in the lateral direction.

  For this purpose, as shown in FIG. 9 and the like, the support 24 is supported on the base end side of the support 24 in a state where the support 24 is vertically supported by the support 19. A bolt insertion hole 24A through which the bolt 20 for fixing is inserted is provided. Further, as shown in FIG. 10 and the like, the support 24 is fixed to the lateral support portion 21 at the front end side of the support 24 when the support 24 is supported in the lateral direction by the lateral support portion 21. A bolt insertion hole 24 </ b> B through which the bolt 22 is inserted is provided.

  Further, as shown in FIG. 7, the width dimension A inside the left and right support columns 24 is larger than the width dimension B of the engine cover 10. Thus, when the support 24 is supported by the horizontal support portion 21 while being laid down in the horizontal direction, the canopy 23 including each support 24 is prevented from interfering with the driver's seat 11, the operating lever device 12, etc. The hydraulic excavator 1 can be made to run even when the height is lowered. Further, as shown in FIG. 7, the outer width C of the left and right struts 24 is set to be equal to or smaller than the width D of the lower traveling body 2, and the canopy 23 including each strut 24 is within the lateral width of the lower traveling body 2. It is configured to fit.

  Reference numeral 25 denotes a U-shaped connecting portion as a connecting portion for connecting the distal ends of the left and right struts 24 to each other. As shown in FIGS. It is formed so as to extend from the front end side of each column 24 toward the driver's seat 11 when each column 24 is supported by the vertical support unit 19 in a state where the column 24 stands in the vertical direction. As shown in FIG. 4 and the like, the U-shaped connecting portion 25 is formed in a substantially U shape when viewed from above. The canopy 23 that covers (protects) is formed.

  In this case, when the U-shaped connecting portion 25 is supported in a state where the support column 24 is set up in the vertical direction by the vertical support portion 19, as shown in FIG. The driver seat 11 can be covered (protected) from above. On the other hand, when the support column 24 is supported by the horizontal support portion while being laid down in the horizontal direction, the U-shaped connecting portion 25 is arranged with the rear side of the driver's seat 11 extending in the vertical direction as shown in FIG. Thus, the driver's seat 11 can be covered (protected) from the rear side.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 self-travels to the work site by the lower traveling body 2 and then turns the working device 4 while turning the upper revolving body 3, for example. The excavation work such as earth and sand can be performed by raising and lowering. When such a hydraulic excavator 1 is in operation (during traveling or working), the operator seated on the driver's seat 11 is protected by the canopy 23.

  Next, an operation of attaching the support bracket 13 to the rear surface 7A side of the counterweight 7 of the upper swing body 3 and an operation of attaching the canopy 23 to the support bracket 13 will be described.

  When attaching the support bracket 13 to the rear surface 7A side of the counterweight 7, the support bracket 13 is disposed on the rear surface 7A side of the counterweight 7 as shown in FIG. The long holes 14D are aligned with the screw holes 7C provided on the lower surface 7B of the counterweight 7, and the cylindrical bodies 17A of the connecting plate 17 constituting the support bracket 13 and the screw holes 7D provided on the rear surface 7A of the counterweight 7 are provided. To match.

  The bolts 15 inserted into the long holes 14D are screwed into the screw holes 7C on the lower surface 7B of the counterweight 7, and the bolts 18 inserted into the cylindrical bodies 17A are screwed into the screw holes 7D on the rear surface 7A of the counterweight 7. By wearing, the support bracket 13 is fixed to the rear surface 7A side of the counterweight 7.

  Next, when the canopy 23 is attached to the support bracket 13 in the vertical direction, as shown in FIG. 9 and the like, the canopy is placed on the left and right vertical support portions 19 of the support bracket 13 from above the support bracket 13. 23 are inserted through the left and right support columns 24. Then, with the bolt insertion holes 24A of each support column 24 and the bolt insertion holes 19A of each vertical support portion 19 aligned, the bolts 20 are inserted into the bolt insertion holes 24A, 19A, and the nuts 20A are inserted into the bolts 20. By screwing, the canopy 23 is attached to the support bracket 13 in a state where the canopy 23 stands in the vertical direction.

  On the other hand, when the excavator 1 is stored, transported, or when the excavator 1 is operated in a place where the ceiling height is lower than the height of the excavator 1 when the canopy 23 is set up in the vertical direction, for example, The canopy 23 can be attached to the support bracket 13 in a state where it is laid down in the lateral direction.

  In this case, as shown in FIG. 10 and the like, the canopy 23 is formed on the left and right lateral support portions 21 (front and rear support portions 21A and 21B) of the support bracket 13 from the rear side of the support bracket 13. , The right support 24 is inserted. Then, in a state where the bolt insertion holes 24B of the respective columns 24 and the bolt insertion holes 21A1 of the respective lateral support portions 21 are made to coincide with each other, the bolt insertion holes 24B and 21A1 and the bolt insertion holes provided in the upper plate 16 are bolted. 22, and a nut 22 </ b> A is screwed into the bolt 22, so that the canopy 23 is attached to the support bracket 13 while being laid down in the lateral direction.

  As described above, according to this embodiment, the vertical support portion 19 can support the canopy 23 in the vertical direction, and the horizontal support portion 21 supports the canopy 23 in the horizontal direction. Therefore, the height of the canopy 23 can be changed with a simple configuration. Further, when the canopy 23 is supported by the lateral support portion 21 while being laid down, the canopy 23 can be configured not to interfere with the driver's seat 11, the operation lever device 12, etc., as shown in FIG. 7 and the like. Therefore, the excavator 1 can be run even when the height of the canopy 23 is lowered. For this reason, compared with the prior art, the hydraulic excavator 1 can be run in a place where the ceiling height is lower, and the traveling performance and workability of the hydraulic excavator 1 can be improved.

  Further, according to the present embodiment, since the vertical support portion 19 and the horizontal support portion 21 are configured by the cylindrical body, the canopy 23 can be stably supported in the vertical direction by the vertical support portion 19. The canopy 23 can be stably supported in the lateral direction by the lateral support portions 21 (front and rear support portions 21A and 21B). Thereby, the support strength of the canopy 23 with respect to the support bracket 13 can be improved, and the reliability of the canopy 23 can be improved.

  Furthermore, according to the present embodiment, the upper and rear sides of the driver's seat 11 are protected by the canopy 23, so that the operator sitting on the driver's seat 11 can be covered (protected) in a wider range.

  Next, FIGS. 11 to 13 show a second embodiment of the present invention. The feature of this embodiment is that the protective member is formed in an inverted U shape as a whole. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 31 denotes a protection bar as a protection member for protecting an operator seated on the driver's seat 11, and the protection bar 31 is roughly constituted by left and right columns 32 and a rod-like connecting portion 33 described later. . Here, as shown in FIG. 13 and the like, the canopy 31 integrally forms the left and right support columns 32 and the rod-like connecting portion 33 by bending a metal tubular material such as a steel pipe. It is configured as a frame.

  Reference numerals 32 are left and right columns whose base end side is supported by the support bracket 13, and each column 32 is, for example, as shown in FIGS. 11 and 13 when the excavator 1 is operated in a place where the ceiling height is high. In addition, when the hydraulic excavator 1 is operated or stored or transported in a place where the ceiling height is low, for example, when the hydraulic excavator 1 is stored or transported, for example, as shown in FIG. It is supported in a state where it is laid down in the horizontal direction by the horizontal support portion 21.

  For this reason, as shown in FIG. 13 and the like, the support column 32 is supported on the base end side of the support column 32 with respect to the vertical support portion 19 when the support column 32 is supported in the vertical direction by the vertical support portion 19. A bolt insertion hole 32A through which the bolt 20 for fixing is inserted is provided. In addition, a bolt 22 is inserted into the front end side of the support column 32 to fix the support column 32 to the lateral support unit 21 when the support unit 32 is supported by the lateral support unit 21 in the horizontal direction. An insertion hole 32B is provided.

  Reference numeral 33 denotes a rod-like connecting portion as a connecting portion for connecting the distal ends of the left and right support columns 32 to each other. The rod-shaped connecting portion 33 extends in the left and right directions between the distal ends of the support columns 32. If it does so, it will be formed in I shape (bar shape) seeing from the top, and the operator who sits in the driver's seat 11 will be protected.

  The hydraulic excavator 1 according to the present embodiment protects an operator seated on the driver's seat 11 using the protective bar 31 as described above, and the basic operation thereof is as described in the first embodiment. There is no particular difference.

  However, according to the present embodiment, since the tip end side of the support column 32 is connected by the rod-shaped connecting portion 33, the protection bar 31 can be simplified in a U-shape as a whole. Thereby, the weight reduction of the protection bar 31, the formation work can be facilitated, and the manufacturing cost can be reduced.

  In each of the above-described embodiments, the case where the bolt insertion hole 21A1 is provided in the front support portion 21A out of the support portions 21A and 21B before and after configuring the lateral support portion 21 has been described as an example. However, the present invention is not limited to this, and for example, a bolt insertion hole may be provided in the rear support portion. For example, it is good also as a structure which provides a bolt insertion hole in both the front and back support parts.

  In each of the above-described embodiments, the case where the lateral support portion 21 is configured by a pair of (front and rear) support portions 21A and 21B provided before and after the through hole 16A of the upper plate 16 is taken as an example. Explained. However, the present invention is not limited to this. For example, the lateral support portion may be configured by only one of the support portions. In this case, it is preferable to improve the support rigidity by providing a bolt insertion hole in the support portion and increasing the axial dimension of the support portion.

  In 2nd Embodiment mentioned above, the case where the protection bar 31 which makes | forms an inverted U shape as a whole was used was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 14, a configuration using a protection bar 31 ′ formed in a substantially H shape by left and right struts 32 ′ and a rod-like connecting portion 33 ′. It is good.

  Further, in each of the above-described embodiments, the crawler hydraulic excavator 1 is described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel-type hydraulic excavator and a wheel loader as long as the construction machine has a driver's seat on the engine cover. .

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4 Working apparatus 5 Turning frame 7 Counterweight 8 Engine 10 Engine cover 11 Driver's seat 13 Support bracket 14 Lower board 16 Upper board 19 Left and right vertical support part 21 Left and right horizontal support part 23 Canopy (protective member)
24, 32, 32 'Left and right struts 25 U-shaped connecting part (connecting part)
31, 31 'Protective bar (protective member)
33,33 'Rod-like connecting part (connecting part)

Claims (2)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a working device provided on the front side of the upper revolving body so as to be able to move up and down,
The upper swing body includes a swing frame in which the working device is mounted on the front side and a counterweight is provided on the rear side, an engine that is positioned on the front side of the counterweight and is provided on the swing frame, and the engine An engine cover that covers the engine from above, a driver's seat that is provided on the engine cover and seated by an operator, a support bracket that is provided on the rear side of the counterweight, and a left side and a right side that are supported by the support bracket on the base end side And a protective member that protects an operator seated in the driver's seat, having a connecting portion that connects the front end sides of the respective supporting posts to each other,
The support bracket includes left and right vertical support portions for supporting the left and right struts in a vertical direction so that a connection portion of the protection member is positioned above the operator, and the protection member Each strut and the left and right lateral support parts that support the connecting part in the state of lying in the horizontal direction ,
The support bracket includes a lower plate extending leftward and rightward, an upper plate spaced apart above the lower plate, and the lower plate positioned on both left and right sides of the lower plate and upper plate. The left and right vertical support portions, which are provided between the upper plate and the left and right columns, are inserted in the vertical direction, and are located on both the left and right sides of the lower plate and the upper plate. A construction machine comprising the left and right lateral support portions formed of a cylindrical body provided on the upper plate and through which the left and right struts are inserted in the lateral direction . Connecting portions the left of the protective member, by the right of the post extending toward the driver's seat, the protective member according to claim 1 comprising constitutes a canopy to protect the upper and rear of the driver's seat Construction machinery.

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