JP2005307523A - Swivel type construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide swivel type construction machinery capable of improving built-up workability without being required for a gap adjustment between an external facing cover, a protector and a counter-weight. <P>SOLUTION: Both right and left protectors 14 and 15, a left back middle cover 17 of an external facing cover 16, a left back upper cover 18 and a right back middle cover 19 are piled up to fit into both right and left end edge parts of the counter-weight 13. Accordingly, even if the counter-weight 13 is formed by a height dimension H regulating the rear face of an upper turning body 3, the counter-weight 13, the protectors 14 and 15, the left back middle cover 17 of the external facing cover 16, the left back upper cover 18 and the right back middle cover 19 are partially piled up, and such a gap that an inside engine 10 or the like is made to peep is not formed. As a result, gap adjustment work in the case of assembly can be omitted, and accuracy of a component can be lower controlled. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a swivel construction machine such as a hydraulic excavator, and more particularly to a swivel construction machine provided with a counterweight, an exterior cover, and the like.

  Generally, as a swing type construction machine, for example, a hydraulic excavator or the like is known, and this hydraulic excavator includes a self-propelled lower traveling body, an upper revolving body provided on the lower traveling body so as to be pivotable, It is mainly constituted by a working device provided on the front side of the upper swing body so as to be able to move up and down.

  The hydraulic excavator includes, for example, a small hydraulic excavator (hereinafter referred to as a small swing excavator) called a small rear swing machine. This small swivel excavator is configured so that the counterweight is arranged close to the swivel center so that the upper swivel body is formed in a substantially circular shape when viewed from the top, and fits within the vehicle width when swiveled. Yes.

  The upper swing body of the small swing excavator is provided at the rear end portion of the swing frame in order to balance the weight of the swing frame, the engine provided on the swing frame, and the working device. A counterweight, an outer cover provided on the swivel frame and covering the engine, the hydraulic pump, a tank and other internal devices in cooperation with the counterweight; and the counterweight located below the outer cover from the counterweight It has left and right skirt covers that extend to the front.

  Here, the skirt cover is arranged so that the rear end portion on the counterweight side is overlapped with the inner peripheral side of the counterweight, so that an internal engine or the like is placed between the skirt cover and the counterweight due to a processing error. The generation of such a peeping gap is suppressed (for example, see Patent Document 1).

  On the other hand, the small swing type hydraulic excavator is formed in a small size so that the upper swing body can be accommodated within the vehicle width, and therefore the counterweight cannot have a sufficient thickness. For this reason, some small turning type hydraulic excavators increase the weight of the counterweight by forming the counterweight with a height that defines the rear surface of the upper turning body (see, for example, Patent Document 2).

JP 2000-291071 A JP 2003-129523 A

  By the way, in the hydraulic excavator according to Patent Document 1 described above, by arranging the rear end portion of the skirt cover so as to overlap the inner peripheral side of the counterweight, a gap is generated between the skirt cover and the counterweight during assembly. The configuration is to suppress.

  However, when the counterweight is formed with a height that defines the rear surface of the upper swing body as in the hydraulic excavator according to Patent Document 2, the counterweight is also in contact with the exterior cover located above the skirt cover. become. For this reason, when assembling the counterweight and the outer cover on the side of the revolving frame, it is necessary to adjust the gap at the portion where the outer cover and the counterweight are in contact with each other. There's a problem.

  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 make it unnecessary to adjust the gap between the outer cover and the protector and the counterweight, and to improve the assembly workability. To provide construction machinery.

  The construction machine according to the invention of claim 1 comprises a self-propelled lower traveling body and an upper revolving body provided on the lower traveling body so as to be capable of swiveling and having a work device attached to the front side. A swivel frame, an engine provided on the swivel frame, a counterweight provided at a rear end portion of the swivel frame for balancing the weight of the working device, and a counter provided on the swivel frame. And an exterior cover that covers the internal device including the engine in cooperation with the weight.

  In order to solve the above-mentioned problem, the invention adopts the feature of the structure of claim 1 in that the counterweight is formed with a height that defines a rear surface of the upper revolving body, and the left and right sides of the counterweight A protector made of a heavy object that forms a part of the counterweight is fitted to the lower side, and the outer cover is located above the left and right protectors on the left and right upper sides of the counterweight. It is that it was set as the structure which fits.

  According to the second aspect of the present invention, the left and right edge portions of the counterweight are recessed on the inner surface side upward and downward to provide the inner surface side fitting grooves, and the counterweight side of each protector and outer cover is provided. In the end edge, the outer surface side is recessed upward and downward, and an outer surface side fitting groove that fits into the inner surface side fitting groove is provided.

  According to the invention of claim 3, the left protector and the left rear middle cover and the left rear upper cover constituting the exterior cover are disposed on the left side of the counterweight, and the right protector is disposed on the right side of the counterweight. The right rear middle cover constituting the exterior cover is arranged.

  According to a fourth aspect of the present invention, the upper surface of the counterweight is provided with another outer surface side fitting groove that is recessed upward and downward on the right edge of the counterweight, and the outer surface side fitting groove is provided with the outer cover. The rear end portion of the tank cover to be formed is configured to be fitted.

  According to the invention of claim 5, the counterweight has an inspection port for inspecting the engine, and the inspection weight is formed by forming a part of the outer cover and moving the inspection weight downward. The engine cover for opening and closing the mouth is provided.

  According to the first aspect of the present invention, when the counterweight is formed with a height that defines the rear surface of the upper swing body, the counterweight and the outer cover come into contact with each other. It can be fitted so as to overlap the upper side. As a result, when assembling the counterweight and the exterior cover, the gap adjustment work between them can be omitted, so that the assembly work time can be shortened and the productivity can be improved, and the accuracy of the parts can be kept low. Manufacturing costs can be reduced.

  In addition, a heavyweight protector is fitted to the left and right sides of the counterweight, eliminating the need for clearance adjustment work when assembling the counterweight and protector. It is possible to improve productivity and reduce manufacturing costs. In addition, since a heavyweight protector can form a part of the counterweight, for example, the thickness of the counterweight can be reduced. In this case, the installation space for the engine or the like can be increased. Assembling workability can be improved, or turning performance can be improved by reducing the turning radius of the upper turning body.

  According to the invention of claim 2, the outer surface side fitting groove provided at the counter weight side edge of the protector and the exterior cover is fitted into the inner surface side fitting groove provided at the left and right edge portions of the counterweight. Thereby, the level | step difference between the outer surface of a counterweight, and the outer surface of a protector and an exterior cover can be made small. Thereby, the appearance on an external appearance can be made favorable. Moreover, since the protector and the exterior cover can be arranged close to the outside, the space for accommodating the internal device such as the engine can be widened.

  Furthermore, the inner side fitting groove and the outer side fitting groove are provided so as to be recessed upward and downward, so that the alignment position of the inner side fitting groove and the outer side fitting groove is set upward and downward. It can be formed as a single extending line. As a result, a good appearance can be obtained without adjusting the gap.

  According to the invention of claim 3, the left protector and the left rear middle cover and the left rear upper cover of the exterior cover can be fitted to the left side of the counterweight, and the right protector and the right rear middle cover of the exterior cover can be fitted to the right side of the counterweight. And can be fitted. As a result, the alignment position between the left end of the counterweight and the left protector, the left rear middle cover and the left rear upper cover and the alignment between the right end of the counterweight and the right protector and the right rear middle cover of the exterior cover The position is a single line extending upward and downward, respectively, and a clean appearance can be achieved.

  According to the invention of claim 4, by fitting the rear end portion of the tank cover to the other outer surface side fitting groove provided at the upper right edge of the counterweight, the outer surface of the counterweight and the outer surface of the tank cover are A level | step difference can be made small and clearance gap adjustment can be abbreviate | omitted. In addition, the other outer surface side fitting groove is formed by denting the outer surface side of the counterweight upward and downward, so that the rear end of the tank cover is formed on the outer surface even when the tank cover is openable. It can be easily fitted into the side fitting groove from the outside.

  According to the fifth aspect of the present invention, the engine inspection work or the like can be easily performed from the inspection opening by opening the engine cover provided on the counterweight. Further, by closing the engine cover and covering the inspection port, the engine can be protected and the appearance can be improved.

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

  1 and 2, reference numeral 1 denotes a small swing hydraulic excavator as a swing type construction machine. The hydraulic excavator 1 can swing on a self-propelled crawler type lower traveling body 2 and the lower traveling body 2. The upper swing body 3 mounted on the upper swing body 3 and the working device 4 provided on the front side of the upper swing body 3 so as to be able to move up and down are roughly constituted.

  Here, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2. The upper swing body 3 includes a swing frame 5, an engine 10, a counterweight 13, protectors 14 and 15, an exterior cover 16, and the like, which will be described later.

  Reference numeral 5 denotes a revolving frame constituting a support structure of the upper revolving structure 3, and a work device 4 is attached to the front side of the revolving frame 5. A counterweight 13 (described later) is attached to the rear end of the turning frame 5, and the engine 10 is mounted on the front side of the counterweight 13.

  A cab 6 is provided on the left side of the revolving frame 5, and the cab 6 defines a cab where an operator performs various operations. A driver's seat 7 on which an operator is seated is provided in the cab 6, and work levers 8 for operating the work device 4 and the like are provided on the left and right sides of the driver's seat 7. Further, a traveling lever / pedal 9 for traveling the lower traveling body 2 is provided on the front side of the driver seat 7.

  Reference numeral 10 denotes an engine (shown in FIGS. 3 and 4) provided on the rear side of the revolving frame 5, and the engine 10 is arranged in a horizontal state extending in the left and right directions. A hydraulic pump 11 driven by the engine 10 is provided on the left side of the engine 10, and a heat exchanger 12 such as a radiator and an oil cooler is provided on the right side of the engine 10. Further, a hydraulic oil tank and a fuel tank (both not shown) are disposed on the right side of the swivel frame 5 on the front side of the heat exchanger 12. Internal devices such as the engine 10, the hydraulic pump 11, the heat exchanger 12, the hydraulic oil tank, and the fuel tank are covered with a counterweight 13, protectors 14 and 15, which will be described later, and an exterior cover 16.

  A counterweight 13 is provided at the rear end portion of the revolving frame 5 and is located on the rear side of the engine 10. The counterweight 13 balances the weight of the work device 4. It is manufactured. Further, the counterweight 13 is formed in an arc shape that is curved so that the central portion protrudes rearward in correspondence with the substantially circular upper revolving structure 3. Further, as shown in FIG. 3, the counterweight 13 has a height that defines the rear surface of the upper swing body 3, that is, an upper portion of an outer cover 16, which will be described later, which is the highest portion excluding the cab 6 from the lower end of the swing frame 5. It is formed with the height dimension H up to.

  The counterweight 13 includes a lower weight portion 13A formed on the lower side and formed thick, a middle weight portion 13B formed on the upper side of the lower weight portion 13A and formed thin, and the middle weight And an upper weight portion 13C formed on the upper side of the portion 13B and formed thick. Further, the outer surface side of the middle weight portion 13B becomes a recessed surface 13B1 that is recessed by one step from the lower weight portion 13A and the upper weight portion 13C, and is fitted to the recessed surface 13B1 when an engine cover 22 described later is closed. It has become. Further, the middle weight portion 13B is provided with an inspection port 13D with a large opening between the lower weight portion 13A and the upper weight portion 13C, and inspection and maintenance operations for the engine 10 and the like are performed from the inspection port 13D. Can be done.

  Further, as shown in FIGS. 5 and 7, a left lower inner surface side fitting groove 13E is formed in the left end edge portion of the lower weight portion 13A by recessing the corner portion on the inner surface side upward and downward. . Further, as shown in FIGS. 6 and 7, a right lower inner surface side fitting groove 13F is formed in the right end edge portion of the lower weight portion 13A by recessing the corner portion on the inner surface side upward and downward. Yes. And it fits so that the outer surface side fitting groove 14B of the left protector 14 mentioned later may overlap with the lower left inner surface side fitting groove 13E, and the outer surface side fitting of the right protector 15 mentioned later into the lower right inner surface side fitting groove 13F. The groove 15B is fitted.

  On the other hand, a left middle inner surface side fitting groove 13G is formed on the left end edge portion of the middle weight portion 13B, extending upward from the lower left inner surface side fitting groove 13E, and a right lower inner surface side fitting groove is formed on the right edge portion. A right middle inner surface side fitting groove 13H is formed extending upward from 13F. Then, the left middle inner surface side fitting groove 13G is fitted with an outer surface side fitting groove 17B of the left rear middle cover 17 which will be described later as shown in FIG. 8 and overlaps with the right middle inner surface side fitting groove 13H. Is fitted in an outer surface side fitting groove 19B of a right rear middle cover 19 which will be described later.

  Further, an upper left inner surface side fitting groove 13J is formed on the left end edge portion of the upper weight portion 13C so as to extend upward from the left middle inner surface side fitting groove 13G. 9, an outer surface side fitting groove 18B of the left rear upper cover 18 described later is fitted. Further, another outer surface side fitting groove 13K is formed in the right end edge portion of the upper weight portion 13C by recessing the corner portion on the outer surface side in the upward and downward directions, and the outer surface side fitting groove 13K will be described later. The rear end portion 20A of the tank cover 20 is fitted.

  Reference numeral 14 denotes a left protector that is positioned on the left front side of the lower weight portion 13A that constitutes the counterweight 13 and is attached to the turning frame 5. The left protector 14 has substantially the same height as the lower weight portion 13A. It is provided to extend to the front side so as to be continuous with the lower weight portion 13A. Further, the left protector 14 is manufactured using, for example, casting means, and is configured as a heavy object that forms a part of the counterweight 13. The left protector 14 also serves as a left rear lower cover that covers the left rear side of the hydraulic pump 11 and the like. The left protector 14 is removed separately from the counterweight 13 when performing inspection work and maintenance work on the lower portion of the hydraulic pump 11 and piping (not shown) connected to the hydraulic pump 11. And can provide a large working space when removed.

  Further, as shown in FIG. 5, the left protector 14 has a trapezoidal outer surface portion 14A having an inclined front side, and a corner portion on the outer surface side located at the rear end portion of the outer surface portion 14A. The outer surface side fitting groove 14B is formed.

  Then, as shown in FIG. 7, the left protector 14 can be overlapped and fitted by inserting the outer surface side fitting groove 14B into the lower left inner surface side fitting groove 13E of the counterweight 13, and this fitting state Then, since the rear end portion of the left protector 14 overlaps the inside of the counterweight 13, a gap is formed between the lower weight portion 13A of the counterweight 13 and the left protector 14 so that the engine 10, the hydraulic pump 11, etc. can be seen. Can be prevented. Moreover, when the outer surface side fitting groove 14B of the left protector 14 is fitted into the lower left inner surface side fitting groove 13E of the counterweight 13, the outer surface portion 14A of the left protector 14 is fitted to the lower weight of the counterweight 13 by fitting the recesses. The outer surface portion 14A and the lower weight portion 13A can be in a state without a step, which can be disposed on the substantially same circumferential surface as the outer surface of the portion 13A.

  On the other hand, 15 is a right protector that is positioned on the right front side of the lower weight portion 13A of the counterweight 13 and is attached to the turning frame 5. The right protector 15 is substantially the same as the lower weight portion 13A in the same manner as the left protector 14. They have the same height and are provided to extend forward so as to be continuous with the lower weight portion 13A. The right protector 15 is configured as a heavy object that forms part of the counterweight 13 together with the left protector 14 using, for example, casting means, and also serves as a right rear lower cover that covers the right rear side of the heat exchanger 12 and the like. . The right protector 15 can be removed separately from the counterweight 13 when performing inspection work, maintenance work, etc. on the lower portion of the heat exchanger 12 and the like.

  As shown in FIG. 6, the right protector 15 includes a trapezoidal outer surface portion 15A having an inclined front side and a corner portion on the outer surface side located at the rear end portion of the outer surface portion 15A, as in the case of the left protector 14. Is formed by an outer surface side fitting groove 15B formed by recessing the upper side and the lower side. Here, the outer surface side fitting groove 15B can be fitted into the lower right inner surface side fitting groove 13F of the counterweight 13, and in this fitted state, the lower weight portion 13A of the counterweight 13 and the right protector 15 There can be no gap and no step between the two.

  Reference numeral 16 denotes an exterior cover provided on the revolving frame 5 from the rear side to the right side of the cab 6. The exterior cover 16 cooperates with the counterweight 13 to operate the engine 10, the hydraulic pump 11, the heat exchanger 12, and the operation. Covers internal equipment including oil tanks, fuel tanks, etc. The exterior cover 16 is generally configured by a left rear middle cover 17, a left rear upper cover 18, a right rear middle cover 19, a tank cover 20, a left skirt cover 21, an engine cover 22, and the like which will be described later.

  Reference numeral 17 denotes a left rear middle cover attached to the revolving frame 5 so as to extend forward from the left end edge portion of the middle weight portion 13B of the counterweight 13. The left rear middle cover 17 is inclined downward along the left protector 14 from the left edge portion of the middle weight portion 13B, and the front end portion is connected to a left skirt cover 21 described later. The left rear middle cover 17 is manufactured by, for example, pressing a steel plate, and covers the left side of the hydraulic pump 11 and the like.

  Further, as shown in FIG. 5, the left rear middle cover 17 has an outer surface portion 17A bent substantially in an S-shape and a corner portion on the outer surface side at the rear end portion of the outer surface portion 17A. It is comprised by the outer surface side fitting groove | channel 17B formed indented. The left rear middle cover 17 can be removed when performing inspection work, maintenance work, etc. of the hydraulic pump 11 and the like.

  Here, the left rear middle cover 17 is overlapped by inserting the outer surface side fitting groove 17B into the left middle inner surface side fitting groove 13G of the counterweight 13, as shown in FIG. In this fitted state, the rear end portion of the left rear middle cover 17 overlaps the inside of the counterweight 13, so that the middle weight portion 13B of the counterweight 13 and the left rear middle cover 17 are It is possible to prevent a gap between the engine 10 and the hydraulic pump 11 from being formed between them. Further, when the outer surface side fitting groove 17B of the left rear middle cover 17 is fitted into the left middle inner surface side fitting groove 13G of the counterweight 13, the outer surface portion 17A of the left rear middle cover 17 will be described later by fitting the recesses. The engine cover 22 can be disposed on substantially the same circumferential surface, and the outer surface portion 17A can be in a state without a step difference from the engine cover 22.

  Reference numeral 18 denotes a left rear upper cover which is positioned on the upper side of the left rear middle cover 17 and is attached to the revolving frame 5. The left rear upper cover 18 is directed from the left end edge portion of the upper weight portion 13C of the counterweight 13 toward the front side. It is formed to extend obliquely downward. The left rear upper cover 18 is manufactured by, for example, pressing a steel plate. Then, as shown in FIG. 5, the left rear upper cover 18 is formed by inclining the outer surface portion 18A inclined and the corner portion on the outer surface side at the rear end portion of the outer surface portion 18A so as to be depressed upward and downward. And the outer surface side fitting groove 18B. The left rear upper cover 18 can be removed when carrying out inspection work, maintenance work, etc. of the upper part of the hydraulic pump 11 and piping.

  Here, the left rear upper cover 18 is fitted in such a manner that the outer surface side fitting groove 18B overlaps the upper left inner surface side fitting groove 13J of the counterweight 13 as shown in FIG. In this state, there can be no gap and no step between the counterweight 13 and the upper weight portion 13C.

  Reference numeral 19 denotes a right rear middle cover attached to the revolving frame 5 so as to extend from the right end edge portion of the middle weight portion 13B of the counterweight 13 to the front side. The right rear middle cover 19 inclines downward along the right protector 15 from the right edge portion of the middle weight portion 13B, and then extends forward so as to cover the periphery of the revolving frame 5. Similarly to the left rear middle cover 17 and the like, the right rear middle cover 19 is manufactured by, for example, pressing a steel plate and covers the right side of the heat exchanger 12 and the like.

  Further, as shown in FIGS. 2 and 6, the right rear middle cover 19 has an outer surface portion 19A bent substantially in an S shape, and is positioned at the rear end portion of the outer surface portion 19A and has a corner on the outer surface side upward. , An outer surface side fitting groove 19B formed by being depressed downward, and a right skirt cover 19C extending forward from the outer surface portion 19A. The right rear middle cover 19 can be removed when performing inspection work, maintenance work, etc. of the heat exchanger 12 or the like.

  Here, the right rear middle cover 19 is fitted in such a manner that the outer surface side fitting groove 19B is overlapped with the right middle inner surface side fitting groove 13H of the counterweight 13, as shown in FIG. In the combined state, there is no gap between the counterweight 13 and the middle weight portion 13 </ b> B, and there can be no step between the engine cover 22. The right skirt cover 19C of the right rear middle cover 19 may be provided separately from the outer surface portion 19A.

  20 is a tank cover (illustrated in FIGS. 2 and 3) provided on the revolving frame 5 on the right side of the cab 6, and the tank cover 20 includes a heat exchanger 12, a hydraulic oil tank, a fuel tank, and the like. Is formed as an upper right cover that covers from above. The tank cover 20 can be opened and closed by, for example, raising and lowering the rear side with the front side as a fulcrum. Further, the rear end portion 20A of the tank cover 20 is fitted from the outside into another outer surface side fitting groove 13K provided at the right end portion of the upper weight portion 13C constituting the counterweight 13, as shown in FIG. Can do.

  Reference numeral 21 denotes a left skirt cover (shown in FIG. 1) provided on the left front side of the revolving frame 5. The left skirt cover 21 constitutes a part of the exterior cover 16, and is arranged in front of the left rear middle cover 17. It extends forward from the part and covers the left side of the revolving frame 5. The left skirt cover 21 may be formed integrally with the left rear middle cover 17 like the right rear middle cover 19.

  Reference numeral 22 denotes an engine cover provided on the outer surface side of the intermediate weight portion 13B of the counterweight 13. The engine cover 22 is curved in an arc shape so as to be received in the concave surface 13B1 of the intermediate weight portion 13B constituting the counterweight 13. Yes. Further, as shown in FIG. 4, the engine cover 22 can open and close the inspection port 13 </ b> D by moving the engine cover 22 upward and downward using, for example, a link mechanism 23. When the engine cover 22 is opened, the inspection port 13D can be opened to perform inspection work and maintenance work on the engine 10 and the like.

  Reference numeral 24 denotes an earth removing plate provided on the front side of the lower traveling body 2, and the earth removing plate 24 is used when leveling the ground and is provided so as to be rotatable upward and downward.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation when the work is performed using the work device 4 or the like will be described.

  First, the operator can make the lower traveling body 2 travel by sitting on the driver's seat 7 in the cab 6 and operating the front traveling lever / pedal 9 in this state. Further, by operating the left and right work levers 8, the work device 4 can be moved up and down to perform soil excavation work and the like.

  Thus, according to the present embodiment, the corner portion on the inner surface side is recessed upward and downward at the left edge portion of the counterweight 13 formed with the height dimension H that defines the rear surface of the upper swing body 3. The lower left inner surface side fitting groove 13E, the left middle inner surface side fitting groove 13G, and the upper left inner surface side fitting groove 13J are provided so that the outer surface side fitting groove 14B of the left protector 14 overlaps the lower left inner surface side fitting groove 13E. The outer rear side fitting groove 17B of the left rear middle cover 17 that fits and forms the outer cover 16 is fitted into the left middle inner surface side fitting groove 13G, and the outer surface side fitting groove 18B of the left rear upper cover 18 is left upper left. It is fitted in the inner surface side fitting groove 13J.

  On the other hand, a lower right inner surface side fitting groove 13F and a right middle inner surface side fitting groove 13H are provided in the right end edge portion of the counterweight 13, and the outer surface side fitting groove 15B of the right protector 15 is used as the lower right inner surface side fitting groove. The outer rear side fitting groove 19B of the right rear middle cover 19 which is fitted so as to overlap with 13F and forms the outer cover 16 is fitted into the right middle inner surface side fitting groove 13H.

  Therefore, even when the counterweight 13 is formed with a height dimension H that defines the rear surface of the upper swing body 3, the counterweight 13, the protectors 14, 15 and the left rear middle cover 17 of the exterior cover 16, the left rear upper cover 18, it is possible to prevent a gap that allows the internal engine 10, the hydraulic pump 11, and the like from being seen from being formed between the right rear middle cover 19 and the like.

  As a result, the counterweight 13, the protectors 14 and 15, and the covers 17, 18, and 19 can omit the gap adjustment work at the time of assembling, thereby shortening the assembling work time and improving the productivity. In addition, it is possible to reduce the manufacturing cost by reducing the accuracy of individual parts.

  Further, the inner surface side fitting grooves 13E, 13F, 13G, 13H, and 13J of the counterweight 13 that is recessed on the inner surface side, and the outer surface sides of the protectors 14 and 15 that are recessed on the outer surface side, and the covers 17, 18, and 19, respectively. Since the fitting grooves 14B, 15B, 17B, 18B, and 19B are overlapped and fitted, the outer surface of the counterweight 13 (engine cover 22) and the outer surfaces of the protectors 14 and 15 and the covers 17, 18, and 19 Can be arranged on substantially the same circumferential surface.

  Thereby, the level | step difference between the counterweight 13, each protector 14,15, and each cover 17,18,19 can be eliminated, and the external appearance can be made favorable. Further, since the covers 17, 18, and 19 of the protectors 14 and 15 and the exterior cover 16 can be disposed outside, the installation space for the engine 10 and the like can be widened.

  Further, the inner surface side fitting grooves 13E to 13J of the counterweight 13 and the protectors 14, 15 and the outer surface side fitting grooves 14B, 15B, 17B, 18B, 19B of the covers 17, 18, 19 are upper and lower. It is recessed in the direction. Accordingly, the alignment positions of the inner surface side fitting grooves 13E to 13J and the outer surface side fitting grooves 14B, 15B, 17B, 18B, and 19B can be formed as one line extending upward and downward, so that the gap adjustment is performed. Even when it is not performed, the connecting portions of the respective parts can be clearly seen, and an even better appearance can be obtained.

  On the other hand, since protectors 14 and 15 made of heavy objects that form a part of the counterweight 13 are provided at the lower position of the counterweight 13, for example, the thickness dimension of the counterweight 13 can be reduced. . Thereby, the installation space of the engine 10 or the like can be widened to improve the assembly workability, or the turning radius of the upper turning body 3 can be reduced and the turning performance can be improved. Further, by removing the protectors 14 and 15, a wide work space for performing inspection work, maintenance work, etc. can be secured.

  The right end portion of the upper weight portion 13C of the counterweight 13 is provided with another outer surface side fitting groove 13K by recessing the outer surface side upward and downward, and the tank surface 20 is provided in the outer surface side fitting groove 13K. The rear end portion 20A is configured to be fitted from the outside. Accordingly, the step between the outer surface of the upper weight portion 13C and the outer surface of the tank cover 20 can be reduced, and the gap adjustment can be omitted. Moreover, even when the tank cover 20 is of an openable type, the rear end portion 20A can be easily fitted from the outside into the outer surface side fitting groove 13K of the counterweight 13.

  Further, the counterweight 13 is provided with an inspection port 13D, and the inspection port 13D is configured to open and close by moving the engine cover 22 upward and downward. As a result, by opening the engine cover 22, it is possible to easily inspect the engine 10 and the like from the inspection port 13D. Further, by closing the engine cover 22 and covering the inspection port 13D, the engine 10 can be protected from earth and sand and the appearance can be improved.

  In the embodiment, the left rear middle cover 17 and the left rear upper cover 18 of the exterior cover 16 are separately provided, so that the left rear middle cover 17 and the left rear upper cover 18 are reduced in size and weight for maintenance and inspection. The case where it can be easily attached and detached has been described as an example. However, the present invention is not limited to this. For example, the left rear middle cover 17 and the left rear upper cover 18 may be integrated to form a single large left rear cover. In this case, a wide range of maintenance and inspection operations can be performed simply by removing the left rear cover. Further, the right rear middle cover 19 may be divided into a plurality of covers.

  In the embodiment, the hydraulic excavator 1 including the cab 6 that defines the cab is described as an example. However, the present invention is not limited to this, and may be applied to, for example, a hydraulic excavator provided with a canopy that covers the upper side of the driver's seat 7.

  In the embodiment, the crawler hydraulic excavator 1 is described as an example of the swing construction machine. However, the present invention is not limited to this, and can be widely applied to other swivel construction machines such as a wheel-type hydraulic excavator and a hydraulic crane.

It is a front view which shows the hydraulic excavator applied to embodiment of this invention. It is a rear view which shows the hydraulic excavator applied to embodiment of this invention. It is a right view which expands and shows the hydraulic shovel of FIG. 1 from the right side. FIG. 3 is a right side view showing the excavator of FIG. 2 with an engine cover opened. It is a disassembled perspective view which respectively shows the counterweight, the left protector, the left rear middle cover of the exterior cover, and the left rear upper cover. It is a disassembled perspective view which shows a part of a counterweight, a right protector, a right rear middle cover of an exterior cover, and a tank cover, respectively. FIG. 7 is an enlarged cross-sectional view of the fitting state of the left protector and the right protector with respect to the lower weight portion of the counterweight as seen from the direction of arrows VII-VII in FIG. 3. FIG. 8 is an enlarged cross-sectional view of the fitting state of the left rear middle cover and the right rear middle cover of the exterior cover with respect to the middle weight portion of the counterweight as seen from the direction of arrows VIII-VIII in FIG. 3. FIG. 4 is an enlarged cross-sectional view of the fitting state of the left rear upper cover of the exterior cover and the tank cover with respect to the upper weight portion of the counterweight as seen from the direction of arrows IX-IX in FIG.

Explanation of symbols

1 Hydraulic excavator (swivel construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4 Working device 5 Turning frame 10 Engine 13 Counterweight 13A Lower weight part 13B Middle weight part 13C Upper weight part 13D Inspection port 13E Left lower inner surface side fitting groove 13F Right lower inner surface side fitting groove 13G Left middle inner surface side fitting groove 13H Right middle inner surface side fitting groove 13J Upper left inner surface side fitting groove 13K Other outer surface side fitting groove 14 Left protector 14A, 15A, 17A, 19A, 18A Outer surface portion 14B, 15B, 17B, 19B, 18B outer side fitting groove 15 right protector 16 exterior cover 17 left rear middle cover 18 left rear upper cover 19 right rear middle cover 20 tank cover 20A rear end 21 left skirt cover 22 engine cover H counterweight height dimension

Claims (5)

A self-propelled lower traveling body, and an upper revolving body provided on the lower traveling body so as to be capable of swiveling and having a work device attached to the front side. The upper revolving body includes a revolving frame and a revolving frame A counterweight provided at a rear end portion of the revolving frame for balancing the weight of the engine provided and the working device; and the engine in cooperation with the counterweight provided on the revolving frame. In a swivel construction machine comprising an exterior cover that covers internal equipment,
The counterweight is formed with a height that defines the rear surface of the upper swing body,
A protector made of a heavy object that forms a part of the counterweight is fitted to the lower left and right sides of the counterweight,
A swivel construction machine characterized in that the outer cover is fitted on the left and right upper sides of the counterweight and located on the left and right protectors.   The left and right edge portions of the counterweight are recessed on the inner surface side and downward to provide an inner surface side fitting groove, and the outer surface side of the protector and outer cover on the counterweight side edge portion The swivel construction machine according to claim 1, wherein an outer surface side fitting groove that is recessed downward and fitted into the inner surface side fitting groove is provided.   The left protector and the left rear middle cover and the left rear upper cover that constitute the outer cover are arranged on the left side of the counterweight, and the right rear that constitutes the right protector and the outer cover are arranged on the right side of the counterweight. The swivel construction machine according to claim 1 or 2, wherein an intermediate cover is disposed.   On the upper right edge of the counterweight, the outer surface side is recessed upward and downward to provide another outer surface side fitting groove, and the rear surface portion of the tank cover that forms the exterior cover in the outer surface side fitting groove The swivel construction machine according to claim 1, 2 or 3, wherein   The counterweight has an inspection port for inspecting the engine, and the counterweight is provided with an engine cover that opens and closes the inspection port by forming a part of the exterior cover and moving upward and downward. The swivel type construction machine according to claim 1, 2, 3, or 4 configured.

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