Construction machine

Abstract

To attach an antenna device without reducing the ease of a maintenance work.SOLUTION: At an upper rear end of a counterweight 10, first upper end inclined surfaces 12B, 13B which slope diagonally downward toward the rear are formed. The first upper end inclined surfaces 12B, 13B are provided with a left antenna mounting seat 19 and a right antenna mounting seat 20 which protrude upward from the first upper end inclined surfaces 12B, 13B. A left antenna device 21 is attached to an upper surface of the left antenna mounting seat 19, and a right antenna device 22 is attached to an upper surface of the right antenna mounting seat 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a construction machine such as a hydraulic excavator equipped with an antenna device. [Background technology]

[0002] A hydraulic excavator, a representative example of construction machinery, comprises a self-propelled undercarriage, an upper rotating body rotatably mounted on the undercarriage, and a work implement mounted on the front side of the upper rotating body. A counterweight is disposed at the rear end of the upper rotating body to balance the weight of the work implement. A machine room accommodating various devices such as a prime mover, hydraulic pump, and heat exchanger, and a cab for the operator are disposed in front of the counterweight. A maintenance opening is formed above the machine room and is covered from above with a cover. Here, in order to maximize the operator's rearward visibility through the rear window of the cab, for example, the upper rear end of the counterweight is sometimes formed at an angle, narrowing the top surface of the counterweight.

[0003] Meanwhile, hydraulic excavators are known that have two antenna devices mounted on the upper rotating body. These antenna devices are, for example, GNSS (Global Navigation Satellite System) antennas such as GPS (Global Positioning System) antennas. A hydraulic excavator equipped with antenna devices can receive position information of the hydraulic excavator from satellites using the two antenna devices, and can support construction management of excavation work and the like based on this position information (see Patent Document 1). Patent Document 1 discloses technology related to the installation of antenna devices when the top surface of the counterweight is narrow. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-41369 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the two antenna devices in Patent Document 1 are attached to both the left and right ends of the counterweight. In this case, the counterweight to which the antenna devices are attached has a central weight portion located in the left-right center and left and right protrusions protruding forward from both left and right ends of the central weight portion, and the antenna devices are attached to the outer side surfaces of the left and right protrusions. As a result, in Patent Document 1, the area of ​​the opening formed above the machinery room is reduced by the left and right protrusions for installing the antenna devices and the scaffolding on which the antenna devices are installed. As a result, there is a problem that it is difficult to perform maintenance through the opening on various equipment, such as the prime mover, housed in the machinery room.

[0006] The present invention has been made in consideration of the problems of the prior art described above, and an object of the present invention is to provide a construction machine that allows an antenna device to be attached while suppressing a reduction in the operator's rear visibility and a reduction in maintenance workability. [Means for solving the problem]

[0007] The present invention provides a construction machine comprising a self-propelled vehicle body, a machinery room provided on the vehicle body in which equipment is housed, a cover that can be opened and closed to cover an opening that connects the inside and outside of the machinery room, a counterweight provided at the rear of the vehicle body adjacent to the cover and positioned at the rear side of the machinery room, and an antenna device provided on the vehicle body for obtaining positional information of the vehicle body, characterized in that a first upper end inclined surface that slopes diagonally downward toward the rear is formed at the upper rear end of the counterweight, and an antenna mounting seat that protrudes upward from the first upper end inclined surface and on whose upper surface the antenna device is attached. [Effects of the Invention]

[0008] According to the present invention, an antenna device can be attached to a counterweight without reducing the ease of maintenance work on the prime mover or the like. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a left side view showing a hydraulic excavator according to an embodiment of the present invention. [Figure 2] FIG. 1 is a perspective view of the upper rotating body with the cab removed, as seen from the right rear. [Figure 3] FIG. 1 is a rear view of the upper rotating body with the cab removed, as seen from the rear. [Figure 4] FIG. 2 is a plan view of the upper rotating body seen from above. [Figure 5] FIG. 2 is a perspective view showing the counterweight alone. [Figure 6] FIG. 10 is a perspective view of the left antenna device with the motor cover and the left rear cover open. [Figure 7] FIG. 10 is a perspective view showing the left connector and other components arranged in the engine compartment with the motor cover and left rear cover open. [Figure 8] FIG. 10 is a perspective view of the right antenna device with the motor cover and the right rear cover open. [Figure 9] FIG. 10 is a perspective view showing the right-side connector and the like arranged in the engine compartment with the engine cover and the right rear cover open. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to a hydraulic excavator as an example, with reference to FIGS.

[0011] A hydraulic excavator 1, a representative example of construction machinery, comprises a self-propelled lower chassis 2 and an upper rotating body 3 rotatably mounted on the lower chassis 2, with the lower chassis 2 and upper rotating body 3 constituting a vehicle body. The lower chassis 2 has left and right crawlers (tracks) 2A, allowing it to travel stably on unleveled work sites. A working device 4 is rotatably mounted on the front side of the upper rotating body 3, and is used to perform work such as excavating earth and sand.

[0012] The upper rotating body 3 has a rotating frame 5 that forms a support structure. A counterweight 10, which will be described later, is attached to the rear end of the rotating frame 5, and the counterweight 10 maintains the weight balance with the work implement 4. A cab 6 that forms the operator's compartment is provided on the front left side of the rotating frame 5. Inside the cab 6, a driver's seat, a travel lever / pedal device, an operating lever device, etc. (none of which are shown) are arranged.

[0013] A right exterior cover 7 is provided on the right side of the revolving frame 5, on the opposite side of the cab 6 with the work implement 4 in between. A fuel tank and a hydraulic oil tank (neither of which are shown) are housed inside the right exterior cover 7. As shown in FIGS. 6 and 7 , a machinery room 9 is provided on the rear side of the revolving frame 5, accommodating a prime mover 8 such as an engine, a hydraulic pump, a heat exchanger, and the like (none of which are shown). The machinery room 9 is surrounded by a counterweight 10, a prime mover cover 14, a left rear cover 15, a right rear cover 16, a left upper cover 17, a right upper cover 18, and the like. The prime mover cover 14, the left rear cover 15, the right rear cover 16, the left upper cover 17, the right upper cover 18, and the like openably and closably cover openings that connect the inside and outside of the machinery room 9.

[0014] Here, the rear surface 3A of the upper rotating body 3, which is formed by the counterweight 10, left rear cover 15, and right rear cover 16, is an arc-shaped convex curved surface centered on the rotation center of the upper rotating body 3. This enables the hydraulic excavator 1 to make small rearward swings, making it suitable for use in narrow work sites such as urban areas.

[0015] The counterweight 10 is attached to the rear end of the revolving frame 5 and is disposed at the rear of the machine room 9 adjacent to the left rear cover 15, right rear cover 16, etc. As shown in FIG. 5 , the counterweight 10 has a base weight portion 11, a left weight portion 12, and a right weight portion 13, and is integrally formed, for example, as a casting. The base weight portion 11 has a height dimension lower than the left weight portion 12 and the right weight portion 13, and extends in the left-right direction while curving in a convex arc toward the rear. The base weight portion 11 is provided with a plurality of bolt insertion holes 11A that penetrate in the front-rear direction, and is attached to the revolving frame 5 using bolts inserted into these plurality of bolt insertion holes 11A.

[0016] The left weight portion 12 is disposed on the left side of the base weight portion 11 in the left-right direction and protrudes upward from the base weight portion 11. The right weight portion 13 is disposed on the right side of the base weight portion 11 in the left-right direction and protrudes upward from the base weight portion 11. The left weight portion 12 and the right weight portion 13 face each other with a gap in the left-right direction and protrude in a bifurcated shape from the base weight portion 11. A motor cover 14 is disposed between the left weight portion 12 and the right weight portion 13.

[0017] An upper end flat surface 12A and a first upper end inclined surface 12B are formed on the upper end side (protruding end side) of the left weight portion 12. The first upper end inclined surface 12B is inclined obliquely downward toward the rear from the upper end flat surface 12A. As a result, the rear end edge 12C of the left weight portion 12 is positioned lower than the upper end flat surface 12A. A left antenna mounting seat 19, which will be described later, is integrally formed on the first upper end inclined surface 12B of the left weight portion 12.

[0018] An upper end flat surface 13A and a first upper end inclined surface 13B are formed on the upper end side (protruding end side) of the right weight portion 13. The first upper end inclined surface 13B is inclined obliquely downward toward the rear from the upper end flat surface 13A. As a result, the rear end edge 13C of the right weight portion 13 is positioned lower than the upper end flat surface 13A. A right antenna mounting seat 20, which will be described later, is integrally formed on the first upper end inclined surface 13B of the right weight portion 13.

[0019] The prime mover cover 14 is provided between the left weight portion 12 and the right weight portion 13 of the counterweight 10, and opens and closes the machinery chamber 9 housing the prime mover 8 and other components. The prime mover cover 14 has a rear cover portion 14A extending vertically between the left weight portion 12 and the right weight portion 13, and a flat upper cover portion 14B bent forward from the upper end of the rear cover portion 14A. The prime mover cover 14 is attached to a support member provided on the revolving frame 5, for example, via a hinge mechanism (neither of which is shown), and covers the machinery chamber 9 from the rear and above in an openable and closable manner, centered on the hinge mechanism. The rear cover portion 14A of the prime mover cover 14 covers the machinery chamber 9 from the rear, and the upper cover portion 14B covers the machinery chamber 9 from above.

[0020] An upper inclined surface 14C that slopes diagonally downward toward the rear is formed at the rear corner where rear cover portion 14A and upper cover portion 14B of motor cover 14 intersect. As a result, rear end edge 14D of motor cover 14 is positioned lower than upper cover portion 14B. Upper inclined surface 14C of motor cover 14 smoothly continues to first upper inclined surface 12B of left weight portion 12 and first upper inclined surface 13B of right weight portion 13 (see FIG. 2).

[0021] The left rear cover 15 is located adjacent to the left end of the counterweight 10 and covers the machinery room 9 from the rear left side. The left rear cover 15 extends vertically along the base weight portion 11 and the left weight portion 12. The left rear cover 15 is attached to a support member provided on the revolving frame 5, for example, via a hinge mechanism (neither of which is shown), and covers the machinery room 9 from the rear left side, openable and closable around the hinge mechanism. The upper end of the left rear cover 15 is located at the same height as the upper end flat surface 12A of the left weight portion 12. A second upper end inclined surface 15A that slopes diagonally downward toward the rear left side is formed on the upper end side of the left rear cover 15, and the rear end edge 15B of the left rear cover 15 is located lower than the upper end of the left rear cover 15. The second upper end inclined surface 15A of the left rear cover 15 smoothly continues along the first upper end inclined surface 12B of the left weight portion 12.

[0022] The right rear cover 16 is located adjacent to the right end of the counterweight 10 and covers the machinery room 9 from the rear right side. The right rear cover 16 extends vertically along the base weight portion 11 and the right weight portion 13. The right rear cover 16 is attached to, for example, a support member provided on the revolving frame 5 via a hinge mechanism (neither of which is shown), and covers the machinery room 9 from the rear right side in an openable and closable manner around the hinge mechanism. The upper end of the right rear cover 16 is located at the same height as the upper end flat surface 13A of the right weight portion 13. A third upper end inclined surface 16A that slopes diagonally downward toward the rear right is formed on the upper end side of the right rear cover 16, and the rear end edge 16B of the right rear cover 16 is located lower than the upper end of the right rear cover 16. The third upper end inclined surface 16A of the right rear cover 16 smoothly continues along the first upper end inclined surface 13B of the right weight portion 13.

[0023] Here, by providing a first upper inclined surface 12B on the left weight portion 12 constituting the counterweight 10, the rear end edge 12C is positioned lower than the upper end flat surface 12A, and by providing a first upper inclined surface 13B on the right weight portion 13, the rear end edge 13C is positioned lower than the upper end flat surface 13A. Furthermore, by providing an upper inclined surface 14C on the rear cover portion 14A constituting the motor cover 14, the rear end edge 14D is positioned lower than the upper cover portion 14B. Furthermore, by providing a second upper inclined surface 15A on the left rear cover 15, the rear end edge 15B is positioned lower than the upper end of the left rear cover 15, and by providing a third upper inclined surface 16A on the right rear cover 16, the rear end edge 16B is positioned lower than the upper end of the right rear cover 16. This configuration ensures as wide a field of view as possible for the operator in the cab 6 when looking rearward through the rear window (not shown).

[0024] The left upper surface cover 17 is disposed adjacent to the left side of the upper cover portion 14B that constitutes the motor cover 14, and adjacent to the front side of the upper end flat surface 12A provided on the left weight portion 12 of the counterweight 10. The left upper surface cover 17, together with the upper cover portion 14B of the motor cover 14, covers the machinery compartment 9 from the upper left side. That is, the left upper surface cover 17 has the same shape as a maintenance opening formed on the upper left side of the machinery compartment 9, and covers this opening from above. Also, as shown in FIG. 6 , a cable insertion hole 17A that opens into the machinery compartment 9 is formed on the front side of the left upper surface cover 17, and a left antenna side cable 23, which will be described later, is inserted through the cable insertion hole 17A.

[0025] The upper right side cover 18 is disposed adjacent to the right side of the upper cover portion 14B that constitutes the motor cover 14, and adjacent to the front side of the upper end flat surface 13A provided on the right weight portion 13 of the counterweight 10. The upper right side cover 18, together with the upper cover portion 14B of the motor cover 14, covers the machinery compartment 9 from the upper right side. That is, the upper right side cover 18 has the same shape as a maintenance opening formed on the upper right side of the machinery compartment 9, and covers this opening from above. Also, as shown in FIG. 8 , a cable insertion hole 18A that opens into the machinery compartment 9 is formed on the rear side of the upper right side cover 18, and a right antenna side cable 25, which will be described later, is inserted through the cable insertion hole 18A.

[0026] The left antenna mounting seat 19 is provided on the left weight portion 12 of the counterweight 10. The left antenna mounting seat 19 is formed integrally with the first upper inclined surface 12B of the left weight portion 12 and protrudes upward from the first upper inclined surface 12B. The upper end (protruding end) of the left antenna mounting seat 19 forms a flat surface 19A, which is flush with the upper flat surface 12A of the left weight portion 12. A plurality of (e.g., three) bolt holes (internal thread holes) 19B are formed in the flat surface 19A of the left antenna mounting seat 19 and the upper flat surface 12A of the left weight portion 12, and a left antenna unit 21 is detachably mounted therein.

[0027] The right antenna mounting seat 20 is provided on the right weight portion 13 of the counterweight 10. The right antenna mounting seat 20 is formed integrally with the first upper inclined surface 13B of the right weight portion 13 and protrudes upward from the first upper inclined surface 13B. The upper end (protruding end) of the right antenna mounting seat 20 forms a flat surface 20A, which is flush with the upper flat surface 13A of the right weight portion 13. A plurality of (e.g., three) bolt holes (internal thread holes) 20B are formed in the flat surface 20A of the right antenna mounting seat 20 and the upper flat surface 13A of the right weight portion 13, and a right antenna device 22 is detachably mounted therein.

[0028] When attaching or detaching the counterweight 10 to or from the revolving frame 5 of the hydraulic excavator 1, a hoisting device (not shown) such as an eyebolt is fixed to the bolt hole 19B formed in the left antenna mounting seat 19 or the like and the bolt hole 20B formed in the right antenna mounting seat 20 or the like. The counterweight 10 can then be hoisted by using a crane (neither of which is shown) to pull up a rope attached to the hoisting device. In this way, the left antenna mounting seat 19 and the right antenna mounting seat 20 also serve as hoisting device mounting seats to which hoisting devices are attached when hoisting the counterweight 10, and are therefore highly strong. This allows the left antenna unit 21 to be stably supported by the highly strong left antenna mounting seat 19, and the right antenna unit 22 to be stably supported by the highly strong right antenna mounting seat 20.

[0029] The left antenna device 21 is attached to the left weight portion 12 of the counterweight 10, and the right antenna device 22 is attached to the right weight portion 13 of the counterweight 10. The left antenna device 21 and the right antenna device 22 are each configured as a GNSS antenna and connected to a controller (not shown) mounted on the hydraulic excavator 1. The controller measures position information of the hydraulic excavator 1 based on signals from the left antenna device 21 and the right antenna device 22, and controls the operation of the hydraulic excavator 1.

[0030] The left antenna device 21 is attached to the upper end of an antenna mounting bracket 21A that protrudes upward from the left weight portion 12. The antenna mounting bracket 21A is placed on the flat surface 19A of the left antenna mounting base 19 and the upper end flat surface 12A of the left weight portion 12, and is fixed in place with a plurality of bolts threaded into bolt holes 19B. The right antenna device 22 is attached to the upper end of an antenna mounting bracket 22A that protrudes upward from the right weight portion 13. The antenna mounting bracket 22A is placed on the flat surface 20A of the right antenna mounting base 20 and the upper end flat surface 13A of the right weight portion 13, and is fixed in place with a plurality of bolts threaded into bolt holes 20B.

[0031] The left antenna device 21 and a controller (not shown) are electrically connected via a left antenna cable 23 and a controller cable 24. One end of the left antenna cable 23 is connected to the left antenna device 21 outside the machine room 9. The other end of the left antenna cable 23 is inserted into the machine room 9 through a cable insertion hole 17A in the left upper surface cover 17, and an antenna connector 23A is attached to the other end of the left antenna cable 23. One end of the controller cable 24 is connected to the controller. The other end of the controller cable 24 is disposed in the machine room 9, and a controller connector 24A is attached to the other end of the controller cable 24. The antenna connector 23A and the controller connector 24A form a single connector that electrically connects the left antenna cable 23 and the controller cable 24, and is disposed in the machine room 9 that is opened and closed by the motor cover 14.

[0032] The right antenna device 22 and a controller (not shown) are electrically connected via a right antenna cable 25 and a controller cable 26. One end of the right antenna cable 25 is connected to the right antenna device 22 outside the machine room 9. The other end of the right antenna cable 25 is inserted into the machine room 9 through a cable insertion hole 18A in the upper right side cover 18, and an antenna connector 25A is attached to the other end of the right antenna cable 25. One end of the controller cable 26 is connected to the controller. The other end of the controller cable 26 is disposed in the machine room 9, and a controller connector 26A is attached to the other end of the controller cable 26. The antenna connector 25A and the controller connector 26A form a single connector that electrically connects the right antenna cable 25 and the controller cable 26, and is disposed in the machine room 9 that is opened and closed by the prime mover cover 14.

[0033] The hydraulic excavator 1 according to this embodiment has the above-described configuration, and its operation will be described below.

[0034] When performing excavation work or the like using the hydraulic excavator 1 and position information of the hydraulic excavator 1 is required, the left antenna device 21 is attached to the left weight portion 12 of the counterweight 10, and the right antenna device 22 is attached to the right weight portion 13. With the left antenna device 21 and the right antenna device 22 attached to the counterweight 10 in this manner, the operator gets into the cab 6 and starts the prime mover 8. In this state, by operating the travel lever / pedal device (not shown), the operator can travel the hydraulic excavator 1 toward the work site, and by operating the operating lever device (not shown), the operator can perform excavation work or the like using the work device 4 while rotating the upper rotating body 3.

[0035] When the hydraulic excavator 1 is in operation, the left antenna device 21 and the right antenna device 22 receive position information of the hydraulic excavator 1 from a satellite and transmit this position information to a controller (not shown). The controller measures the position information of the hydraulic excavator 1 based on the position information from the left antenna device 21 and the right antenna device 22, compares this position information of the hydraulic excavator 1 with terrain data and target terrain data, performs calculations for working on the target terrain, and displays the work information (calculation results) on a monitor in the cab 6, for example. This allows the operator to work on the target terrain by controlling the operation of the work implement 4 using the operating lever device while checking the work information displayed on the monitor.

[0036] In this embodiment, the left weight portion 12 of the counterweight 10 is provided with a first upper inclined surface 12B, so that the rear edge 12C is positioned lower than the upper flat surface 12A. The right weight portion 13 is provided with a first upper inclined surface 13B, so that the rear edge 13C is positioned lower than the upper flat surface 13A. The rear cover portion 14A of the motor cover 14 is provided with an upper inclined surface 14C, so that the rear edge 14D is positioned lower than the upper cover portion 14B. Furthermore, the left rear cover 15 is provided with a second upper inclined surface 15A, so that the rear edge 15B is positioned lower than the upper end of the left rear cover 15. The right rear cover 16 is provided with a third upper inclined surface 16A, so that the rear edge 16B is positioned lower than the upper end of the right rear cover 16. This ensures a wide rearward view for the operator in the cab 6 through the rear window, improving workability during excavation. Furthermore, the left antenna device 21 and the right antenna device 22 are attached to the rear of the counterweight 10. In other words, by disposing the left antenna device 21 and the right antenna device 22 at positions on the revolving frame 5 farther from the cab 6, the field of view obstructed by the left antenna device 21 and the right antenna device 22 when the operator inside the cab 6 looks rearward through the rear window can be made narrower than if the left antenna device 21 and the right antenna device 22 were disposed at positions closer to the cab 6.

[0037] Here, because the first upper inclined surface 12B formed on the rear end of the left weight portion 12 is not flat, it is difficult to attach the left antenna device 21 to the first upper inclined surface 12B. If the left antenna device 21 were attached only to the flat upper surface 12A located forward of the first upper inclined surface 12B, the left antenna device 21 would be positioned closer to the front of the left weight portion 12, narrowing the opening on the upper left side of the machinery compartment 9 covered by the left upper surface cover 17. As a result, when removing the left upper surface cover 17 to perform maintenance work on the onboard equipment housed in the machinery compartment 9, sufficient working space cannot be secured, which may reduce the efficiency of the maintenance work. Similarly, if the right antenna device 22 were attached only to the flat upper surface 13A of the right weight portion 13 located forward of the first upper inclined surface 13B, the opening on the upper right side of the machinery compartment 9 covered by the upper right surface cover 18 would be narrowed. As a result, when removing the upper right side cover 18 to perform maintenance work on the onboard equipment housed in the machinery room 9, it is not possible to ensure sufficient working space, which may reduce the efficiency of the maintenance work.

[0038] In contrast, in this embodiment, the left antenna mounting seat 19 is provided on the first upper inclined surface 12B of the left weight portion 12, and the left antenna device 21 is attached to the upper flat surface 12A of the left weight portion 12 and the flat surface 19A of the left antenna mounting seat 19. The right antenna mounting seat 20 is provided on the first upper inclined surface 13B of the right weight portion 13, and the right antenna device 22 is attached to the upper flat surface 13A of the right weight portion 13 and the flat surface 20A of the right antenna mounting seat 20. This allows the left antenna device 21 and the right antenna device 22 to be positioned as close to the rear edge of the counterweight 10 as possible. As a result, it is possible to ensure a large opening on the upper left side of the machinery compartment 9 covered by the left upper surface cover 17 and a large opening on the upper right side of the machinery compartment 9 covered by the upper right surface cover 18, improving the ease of maintenance of the onboard equipment housed in the machinery compartment 9 by removing the left upper surface cover 17 or the upper right surface cover 18.

[0039] Here, because the left antenna device 21 and the right antenna device 22 are precision instruments, when the hydraulic excavator 1 is loaded onto a transport vehicle and transported to a work site, the left antenna device 21 and the right antenna device 22 are each detached from the counterweight 10 before being transported to the work site. For this reason, the antenna side connector 23A of the left antenna side cable 23 is separated from the controller side connector 24A of the controller side cable 24, and the left antenna side cable 23 and the antenna side connector 23A are taken out to the outside of the machine room 9 through the cable insertion hole 17A of the left upper surface cover 17. Similarly, the antenna side connector 25A of the right antenna side cable 25 is separated from the controller side connector 26A of the controller side cable 26, and the right antenna side cable 25 and the antenna side connector 25A are taken out to the outside of the machine room 9 through the cable insertion hole 18A of the right upper surface cover 18.

[0040] On the other hand, after the left antenna device 21 and the right antenna device 22 are attached to the counterweight 10 of the hydraulic excavator 1 transported to the work site, the left antenna side cable 23 and the controller side cable 24 are connected, and the right antenna side cable 25 and the controller side cable 26 are connected.

[0041] When connecting the left antenna-side cable 23 and the controller-side cable 24, for example, as shown in FIGS. 6 and 7 , with the motor cover 14 and the left rear cover 15 open to open the machine compartment 9, the left antenna-side cable 23 and the antenna-side connector 23A are inserted into the machine compartment 9 through the cable insertion hole 17A in the left upper surface cover 17. Then, the antenna-side connector 23A is connected to the controller-side connector 24A of the controller-side cable 24 arranged in the machine compartment 9. When connecting the right antenna-side cable 25 and the controller-side cable 26, for example, as shown in FIGS. 8 and 9 , with the motor cover 14 and the right rear cover 16 open to open the machine compartment 9, the right antenna-side cable 25 and the antenna-side connector 25A are inserted into the machine compartment 9 through the cable insertion hole 18A in the right upper surface cover 18. Then, the antenna-side connector 25A is connected to the controller-side connector 26A of the controller-side cable 26 arranged in the machine compartment 9.

[0042] As described above, when attaching and detaching the left antenna device 21 and the right antenna device 22 to and from the counterweight 10 in order to transport the hydraulic excavator 1 to a work site, it is necessary to connect and disconnect the left antenna side cable 23 and the controller side cable 24, and to connect and disconnect the right antenna side cable 25 and the controller side cable 26. In this embodiment, the antenna side connector 23A of the left antenna side cable 23 and the controller side connector 24A of the controller side cable 24, as well as the antenna side connector 25A of the right antenna side cable 25 and the controller side connector 26A of the controller side cable 26, are located inside the machine room 9, which is opened and closed by the prime mover cover 14.

[0043] This allows an operator to easily connect and disconnect the antenna side connector 23A and the controller side connector 24A inside the machinery compartment 9 by opening the engine cover 14 and exposing the machinery compartment 9, thereby quickly installing and removing the left antenna device 21. Similarly, the operator can easily connect and disconnect the antenna side connector 25A and the controller side connector 26A inside the machinery compartment 9, allowing quickly installing and removing the right antenna device 22.

[0044] Thus, in the embodiment, the hydraulic excavator 1 includes a self-propelled vehicle body, a machine room 9 provided on the vehicle body and accommodating equipment, a cover that can open and close an opening that communicates between the inside and outside of the machine room 9, a counterweight 10 provided at the rear of the vehicle body adjacent to the cover and located on the rear side of the machine room 9, and an antenna device provided on the vehicle body for obtaining positional information of the vehicle body, wherein a first upper-end inclined surface that slopes diagonally downward toward the rear is formed at the upper end of the rear of the counterweight 10, and an antenna mounting seat that protrudes upward from the first upper-end inclined surface and on whose upper surface the antenna device is mounted is provided. With this configuration, by providing the antenna mounting seat on the first upper-end inclined surface, it is not necessary to mount the antenna device closer to the front of the counterweight 10 to avoid the first upper-end inclined surface. As a result, a large opening for the machinery room 9 formed in front of the counterweight 10 can be secured, improving workability when performing maintenance on various equipment such as the prime mover housed in the machinery room 9 through this opening.

[0045] In this embodiment, the antenna device has a left antenna device 21 and a right antenna device 22, the antenna mounting seat comprises a left antenna mounting seat 19 to which the left antenna device 21 is attached and a right antenna mounting seat 20 to which the right antenna device 22 is attached, the counterweight 10 has a base weight portion 11 extending in the left-right direction, and a left weight portion 12 and a right weight portion 13 that rise upward from the base weight portion 11 and face each other with a gap in the left-right direction, the left weight portion 12 being provided with a first upper inclined surface 12B and the left antenna mounting seat 19, and the right weight portion 13 being provided with a first upper inclined surface 13B and the right antenna mounting seat 20. With this configuration, the left antenna device 21 and the right antenna device 22 can be attached to the counterweight 10 with an appropriate gap in the left-right direction. In this case, there is no need to mount the left antenna device 21 closer to the front of the counterweight 10 to avoid the first upper inclined surface 12B, and there is no need to mount the right antenna device 22 closer to the front of the counterweight 10 to avoid the first upper inclined surface 13B. As a result, a large opening for the machinery room 9 formed in front of the counterweight 10 can be secured.

[0046] In this embodiment, a prime mover cover 14 is provided between the left weight portion 12 and the right weight portion 13 of the counterweight 10, covering the machine room 9 in a manner that allows it to be opened and closed from the rear. The left antenna device 21 and the right antenna device 22 are each connected via cables to a controller mounted on the vehicle body. The vehicle body is equipped with a left antenna side cable 23 and a right antenna side cable 25 connected to the left antenna device 21 and the right antenna device 22, respectively, controller side cables 24, 26 connected to the controllers, an antenna side connector 23A and a controller side connector 24A that connect the left antenna side cable 23 and the controller side cable 24, and an antenna side connector 25A and a controller side connector 26A that connect the right antenna side cable 25 and the controller side cable 26. The antenna side connector 23A and the controller side connector 24A, and the antenna side connector 25A and the controller side connector 26A are disposed in the machine room 9, which is opened and closed by the prime mover cover 14.

[0047] According to this configuration, by opening the engine cover 14 and exposing the machinery compartment 9, the connection and disconnection work between the antenna side connector 23A and the controller side connector 24A can be easily performed inside the machinery compartment 9, allowing for quick installation and removal of the left antenna device 21. Similarly, the connection and disconnection work between the antenna side connector 25A and the controller side connector 26A can be easily performed inside the machinery compartment 9, allowing for quick installation and removal of the right antenna device 22.

[0048] In this embodiment, the left antenna mounting seat 19 and the right antenna mounting seat 20 of the counterweight 10 also serve as hoisting fixture mounting seats to which a hoisting fixture is attached when hoisting the counterweight 10. With this configuration, the left antenna mounting seat 19, which has high strength, can stably support the left antenna device 21, and the right antenna mounting seat 20, which has high strength, can stably support the right antenna device 22.

[0049] In this embodiment, the cover includes a left rear cover 15 provided adjacent to the left side of the counterweight 10, and a right rear cover 16 provided adjacent to the right side of the counterweight 10. The left rear cover 15 is formed with a second upper inclined surface 15A that slopes diagonally downward from its upper end toward the outside of the vehicle body, and the right rear cover 16 is formed with a third upper inclined surface 16A that slopes diagonally downward from its upper end toward the outside of the vehicle body. The second upper inclined surface 15A and the third upper inclined surface 16A are formed to follow the first upper inclined surfaces 12B, 13B of the adjacent counterweight 10, respectively.

[0050] According to this configuration, the rear edge 15B of the left rear cover 15 is positioned lower than the upper end of the left rear cover 15, and the rear edge 16B of the right rear cover 16 is positioned lower than the upper end of the right rear cover 16. This ensures a wide field of view for the operator when looking rearward through the rear window or the like of the cab 6.

[0051] Note that the embodiment illustrates an example in which a counterweight 10 is used that has a base weight portion 11 extending in the left-right direction and a left weight portion 12 and a right weight portion 13 that protrude upward from both left and right sides of the base weight portion 11, with a left antenna mounting seat 19 provided on the first upper inclined surface 12B of the left weight portion 12 and a right antenna mounting seat 20 provided on the first upper inclined surface 13B of the right weight portion 13. However, the present invention is not limited to this, and it is also possible to use a curved counterweight that extends in the left-right direction with a uniform height, with left and right antenna mounting seats provided on upper inclined surfaces formed at the rear upper end of this counterweight. [Explanation of symbols]

[0052] 2 Undercarriage (car body) 3 Upper rotating body (car body) 9 Machine room 10 Counterweight 11 Base weight section 12 Left weight part 12B,13B 1st upper end slope 13 Right weight part 14 Engine cover (cover) 15 Left rear cover (cover) 15A 2nd upper end slope 16 Right rear cover (cover) 16A 3rd upper end slope 17 Top left cover (cover) 18 Right upper cover (cover) 19 Left antenna mounting base (hanging bracket mounting base) 20 Right antenna mounting base (hanging bracket mounting base) 21 Left antenna unit 22 Right antenna unit 23 Left antenna cable 23A, 25A Antenna side connector 24,26 Controller side cable 24A, 26A Controller side connector

Claims

1. A self-propelled vehicle, a machinery room provided in the vehicle body and accommodating equipment; a cover that can open and close an opening that communicates the inside and outside of the machine room; a counterweight provided at the rear of the vehicle body, adjacent to the cover, and located rearward of the machinery compartment; an antenna device provided on the vehicle body for acquiring position information of the vehicle body, A first upper end inclined surface inclined obliquely downward toward the rear is formed at the upper end of the rear portion of the counterweight, a construction machine characterized in that the first upper inclined surface is provided with an antenna mounting seat that protrudes upward from the first upper inclined surface and on whose upper surface the antenna device is mounted;

2. the antenna device includes a left antenna device and a right antenna device, the antenna mounting seat includes a left antenna mounting seat to which the left antenna device is attached and a right antenna mounting seat to which the right antenna device is attached, The counterweight has a base weight portion extending in the left-right direction, and a left weight portion and a right weight portion that rise upward from the base weight portion and face each other with a gap in the left-right direction, 2. The construction machine according to claim 1, wherein the left weight portion is provided with the first upper inclined surface and the left antenna mounting seat, and the right weight portion is provided with the first upper inclined surface and the right antenna mounting seat.

3. a prime mover cover that covers the machine room from the rear and can be opened and closed is provided between the left weight portion and the right weight portion of the counterweight, the left antenna device and the right antenna device are connected to a controller mounted on the vehicle body via cables, the vehicle body is equipped with two antenna-side cables connected to the left antenna device and the right antenna device, respectively, a controller-side cable connected to the controller, and two connectors connecting the two antenna-side cables and the controller-side cable; 3. The construction machine according to claim 2, wherein the two connectors are arranged in the machine room which is opened and closed by the engine cover.

4. 2. The construction machine according to claim 1, wherein the antenna mounting seat of the counterweight also serves as a hoisting tool mounting seat to which a hoisting tool is attached when hoisting the counterweight.

5. The cover is a left rear cover provided adjacent to the left side of the counterweight; a right rear cover provided adjacent to the right side of the counterweight; and The left rear cover has a second upper end inclined surface that is inclined obliquely downward from an upper end toward an outer side of the vehicle body, The right rear cover has a third upper end inclined surface that is inclined obliquely downward from an upper end toward an outer side of the vehicle body, 2. The construction machine according to claim 1, wherein the second upper inclined surface and the third upper inclined surface are formed so as to follow the first upper inclined surface of the adjacent counterweight.

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