JP2016169482A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine that enhances workability when maintaining and replacing a battery and other equipment.SOLUTION: An upstream side chamber 17 of a heat exchanger located on a more upstream side of cooling air than a heat exchanger is surrounded with a building, a front partition plate, and a rear partition plate 25. The upstream side chamber 17 of the heat exchanger houses a first battery 18 and a second battery 19 that serve as power sources for an engine and other electric equipment, and a disconnecting switch 36 that connects or disconnects the batteries 18 and 19 to or from the engine and other electric equipment. Switch fitting parts 34A to 34D are formed on the rear partition plate 25, the switch fitting part protruding toward the upstream side chamber 17 of the heat exchanger and having a storage space 35 between the rear partition plate 25 and a counterweight 6. The disconnecting switch 36 is fitted on the switch fitting parts 34A to 34D while being protruded into the storage space 35.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction machine such as a hydraulic excavator provided with a battery serving as a power source for an engine and various electric devices, for example.

  In general, a hydraulic excavator, which is a typical example of a construction machine, is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an upper revolving body that can be raised and lowered. And a front device.

  The upper revolving structure includes a revolving frame that forms a support structure and to which the front device is attached, a counterweight provided at the rear end of the revolving frame that balances the weight with the front device, and a left and right direction on the front side of the counterweight An engine mounted in a horizontally extending state, a cooling fan disposed on the left side of the engine for sucking external air as cooling air, and an upstream side of the cooling air flow direction by the cooling fan And a heat exchange device arranged to face the cooling fan. The mounted equipment including the engine and the heat exchange device is covered with a building provided on the front side of the counterweight.

  Here, an upstream chamber of the heat exchange device is provided upstream of the heat exchange device with respect to the flow direction of the cooling air supplied to the heat exchange device. The upstream chamber of the heat exchange device is provided with a battery serving as a power source for the engine and various electric devices, and a disconnect switch for energizing or shutting off the battery with respect to the engine and the electric devices (for example, Patent Documents). 1).

JP 2014-20101 A

  By the way, in the thing by patent document 1, the disconnect switch is attached to the front partition plate which partitions off the front side of a heat exchange apparatus upstream chamber. In this case, the disconnect switch protrudes largely from the front partition plate toward the heat exchange device upstream chamber. For this reason, when performing maintenance work or replacement work of the battery or other devices, there is a problem that the disconnect switch becomes an obstacle and workability is lowered. In particular, a small swivel hydraulic excavator capable of working in a narrow space has a problem that the upstream chamber of the heat exchange device is narrow and the workability is further reduced.

  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 provide a construction machine capable of improving workability when performing maintenance work or replacement work for equipment such as a battery. There is.

  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 an upper revolving body that can be raised and lowered. The upper revolving structure comprises a front structure, and the upper revolving structure forms a support structure to be attached to the lower traveling structure, and the foot section of the front apparatus is attached to an intermediate portion in the left and right directions on the front side of the support structure. Counterweight which is provided at the rear end of the swivel frame and has a sloping surface on which at least one of the left and right sides of the front surface is slanted forward to balance the weight of the swivel frame and the front device. And an engine mounted on the front side of the counterweight in a horizontally placed state extending in the left and right directions at the rear of the swivel frame, and disposed on one side of the engine in the left and right directions. air A cooling fan that sucks in as cooling air, a heat exchange device that is arranged to face the cooling fan so as to be located upstream in the flow direction of the cooling air by the cooling fan, a front side of the engine, and the front device A cab provided on one side of the left and right sides with the foot portion interposed therebetween, and an oil storage provided on the front side of the engine and on the other side of the left and right sides with the foot portion of the front device interposed therebetween. A tank, a counterweight, a cab, and an oil storage tank, and a left and right side cover and a top cover, and a building that covers the engine and the mounted equipment including the heat exchange device; and the heat A front partition plate located between the front portion of the exchange device and the rear surface of the cab and extending in the left and right directions, and facing the front partition plate with a gap in the front and rear directions, and the heat exchange The rear of the device or A rear partition plate extending along the front surface of the counterweight, and located upstream of the heat exchange device with respect to the flow direction of cooling air supplied to the heat exchange device, the building and each partition A heat exchange device upstream chamber surrounded by a plate, a battery located on the swivel frame located in the heat exchange device upstream chamber and serving as a power source for the engine and various electrical devices, and the engine and the electrical devices In a construction machine comprising a disconnect switch for energizing or shutting off the battery, the rear partition plate is projected to the upstream side of the heat exchange device by projecting the rear partition plate and the counter A switch mounting part having a receiving space is formed between the weight and the disconnect switch, and the disconnect switch is protruded into the receiving space in the switch mounting part. It is characterized by having a configuration for mounting.

  According to the present invention, even when a disconnect switch is provided in a narrow heat exchange device upstream chamber, it is possible to improve workability when performing maintenance work or replacement work on equipment such as a battery.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is a top view which expands and shows the hydraulic excavator which abbreviate | omitted a part of front apparatus. It is a top view which shows a turning frame, an engine, a heat exchange apparatus, a battery, a disconnect switch, etc. It is a front view of the principal part expansion which shows the rear side part of an upper revolving body in the state which removed the left side surface cover. It is sectional drawing which expands and shows a counterweight, a rear partition plate, a battery, a disconnect switch, etc. from the arrow VV direction in FIG. It is the perspective view which looked at the cab, the rear partition plate, the battery, the disconnect switch, etc. with the counterweight and the left side cover removed. It is the perspective view which looked at a revolving frame, a rear partition plate, a battery, a disconnect switch, etc. from the left front. It is the disassembled perspective view which looked at the state which removed the heat exchange apparatus upstream chamber side cover and accommodation space side cover of the disconnect switch from the rear partition plate from the same position as FIG. It is a perspective view which shows a back partition plate alone. It is a perspective view which shows a counterweight alone. It is a circuit diagram which shows the connection state of an engine starter motor, a controller, a battery, a disconnect switch, etc. It is sectional drawing which looked at the disconnect switch by the 2nd Embodiment of this invention from the same position as FIG. 5 with the counterweight, the rear partition plate, the battery, etc.

  Hereinafter, as a representative example of the construction machine according to the first embodiment of the present invention, a wheel-type hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings.

  1 to 11 show a first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 is a wheeled hydraulic excavator provided with a self-propelled wheel-type lower traveling body 2 having left and right front wheels 2A and left and right rear wheels 2B. The hydraulic excavator 1 includes an upper swing body 3 that is turnably mounted on the lower traveling body 2 and a front device 4 that is provided on the upper swing body 3 so as to be able to move up and down. In this case, the excavator 1 is a small swivel type in which the minimum turning radius of the front device 4 from the turning center of the upper turning body 3 and the rear end turning radius from the turning center to the rear end of the counterweight 6 have substantially the same dimensions. It is a hydraulic excavator.

  The front device 4 includes a boom 4A, an arm 4B, a bucket 4C, a boom cylinder 4D, an arm cylinder 4E, a bucket cylinder 4F, and the like. As shown in FIG. 2, the foot part 4G of the boom 4A is rotatably attached to an intermediate part in the left and right directions on the front side of a turning frame 5 described later.

  The revolving frame 5 constitutes a support structure for the upper revolving structure 3. The foot portion 4G of the front device 4 is attached to the front side, and is mounted on the lower traveling structure 2 so as to be able to revolve. The revolving frame 5 forms a strong support structure and constitutes a body ground to which a minus terminal 18B of the first battery 18 described later is connected.

  As shown in FIG. 3, the revolving frame 5 includes a bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions, and is erected on the bottom plate 5A, and front and rear at predetermined intervals in the left and right directions. Left vertical plate 5B and right vertical plate 5C extending in the direction, left and right left and right of each vertical plate 5B and 5C, and left and right side frames 5D and 5E extending forward and rearward, A plurality of projecting beams 5F projecting from the bottom plate 5A and the vertical plates 5B and 5C in the left and right directions and supporting the left and right side frames 5D and 5E at the front ends thereof, and gaps between the projecting beams 5F And an under cover 5G provided so as to be buried.

  A front device 4 (foot portion 4G) is attached to the front side of each of the vertical plates 5B and 5C so as to be able to move up and down, and a counterweight 6 to be described later is attached to the rear side. The left rear extended beam 5F provided between the rear end side of the left vertical plate 5B and the rear end side of the left side frame 5D among the plurality of extended beams 5F is in the length direction (left and right directions). Is bent forward, and the left side (left side frame 5D side) is an inclined portion 5F1. Then, two female screw holes 5F2 for attaching a later-described rear partition plate 25 are provided on the upper end side of the inclined portion 5F1 so as to be spaced apart in the left and right directions (see FIG. 5).

  The counterweight 6 is provided at the rear ends of the left and right vertical plates 5B and 5C constituting the revolving frame 5. The counterweight 6 is for balancing the weight with the front device 4. Here, since the hydraulic excavator 1 is a small turning type hydraulic excavator, the counterweight 6 is disposed at a position close to the turning center of the upper turning body 3. Accordingly, the rear surface 6A of the counterweight 6 is formed in a substantially arc shape centering on the turning center of the upper turning body 3 (see FIG. 2).

  As shown in FIGS. 5 and 10, the front surface 6B side of the counterweight 6 has a central surface 6B1 located in the center and extending left and right, and a left inclined surface inclined forward from the left end side of the central surface 6B1. 6B2 and a right inclined surface 6B3 that is inclined forward from the right end side of the center surface 6B1.

  A left recessed portion 6C as a recessed portion is provided on the lower end side of the left inclined surface 6B2. The left recessed portion 6C forms a space portion by being recessed backward from the left inclined surface 6B2 at a position facing a disconnect switch 36 described later. The left recessed portion 6C is provided with two through holes 6C1 and 6C2 penetrating in the front and rear directions side by side in the left and right directions. Tail lamps and turn signals are attached to the through holes 6C1 and 6C2.

  On the other hand, a right recessed portion 6D is provided on the lower end side of the right inclined surface 6B3. The right recessed portion 6D is recessed rearward from the right inclined surface 6B3 at a position facing the left recessed portion 6C in the left and right directions. Two through holes 6D1 and 6D2 penetrating in the front and rear directions are provided in the right recessed portion 6D side by side in the left and right directions. A tail lamp or turn signal (not shown) is attached to these through holes 6D1 and 6D2.

  The engine 7 is located at the front side of the counterweight 6 and is provided at the rear portion of the turning frame 5. As shown in FIG. 3, the engine 7 is mounted in a horizontally placed state extending in the left and right directions. A cooling fan 7 </ b> A that sucks external air as cooling air is disposed on the left side, which is one side of the left and right directions of the engine 7. On the other hand, a hydraulic pump 8 is disposed on the right side of the engine 7. The hydraulic pump 8 is driven by the engine 7 to discharge pressure oil for operation toward various hydraulic actuators provided in the lower traveling body 2, the upper swing body 3, and the front device 4.

  An intake pipe 7B is connected to the intake side of the engine 7, and the front end side of the intake pipe 7B extends into a heat exchange device upstream chamber 17 (described later) located on the upstream side of the heat exchange device 12, and its front end. Is attached with an air cleaner 9. On the other hand, an exhaust pipe is connected to the exhaust side of the engine 7, and an exhaust gas aftertreatment device 10 is provided in the middle of the exhaust pipe. The exhaust gas aftertreatment device 10 includes a silencer mechanism for reducing exhaust gas noise. In addition to this, when the output of the engine 7 exceeds the set value of the exhaust gas regulation, the exhaust gas aftertreatment device 10 is provided with a mechanism for removing harmful substances in the exhaust gas discharged from the engine 7. Can do.

  The starter motor 11 constitutes a load circuit (see FIG. 11). This starter motor 11 serves as a power source when starting the engine 7 and constitutes a part of the engine 7. The starter motor 11 is configured as an electric motor, and is connected to a plus terminal 19C of the second battery 19 via a load wiring 21 and a main switch 22 which will be described later. Further, the starter motor 11 is connected to the turning frame 5 (body earth) via another grounding wire 11A separately from the load wiring 21. Thereby, the starter motor 11 starts the engine 7 by being rotationally driven by power supply from the batteries 18 and 19.

  The heat exchanging device 12 is arranged to face the cooling fan 7A so as to be located upstream in the flow direction of the cooling air by the cooling fan 7A. This heat exchange device 12 is sucked by, for example, a support frame 12A constituting an outer shell, a radiator 12B disposed in the support frame 12A for cooling engine cooling water, an oil cooler 12C for cooling hydraulic oil, and the engine 7. An intercooler 12D for cooling the air is used. The heat exchange device 12 is covered with a building 16 (to be described later) together with the engine 7, the hydraulic pump 8, and the like.

  The cab 13 is provided on the front side of the engine 7 and on the left side with the foot portion 4G of the front device 4 interposed therebetween. The cab 13 is carried by an operator, and a driver's seat on which the operator is seated, a handle for traveling, an operation lever for work, and the like (all not shown) are disposed. Further, in the vicinity of the driver's seat, a key switch 13A (see FIG. 11) for operating on / off of the electric system of the hydraulic excavator 1 and starting / stopping the engine 7 is disposed.

  The hydraulic oil tank 14 as an oil storage tank is provided on the revolving frame 5 on the front side of the engine 7 and on the right side which is the other side in the left and right directions with the foot portion 4G of the front device 4 interposed therebetween. . The hydraulic oil tank 14 stores hydraulic oil supplied to various actuators mounted on the hydraulic excavator 1. On the other hand, a fuel tank 15 as an oil storage tank is provided on the revolving frame 5 adjacent to the right side of the hydraulic oil tank 14. The fuel tank 15 stores fuel supplied to the engine 7.

  The building 16 is positioned on the rear side of the upper swing body 3 and is provided on the swing frame 5. The building 16 is located between the counterweight 6, the cab 13, the hydraulic oil tank 14, and the fuel tank 15, and covers mounted equipment including the engine 7, the heat exchange device 12, and the like. The building 16 includes an upper surface cover 16A that covers the upper side of the engine 7, the heat exchange device 12, etc., a left side cover 16B that rises from the left end of the upper surface cover 16A so as to face the heat exchange device 12, and from the right end of the upper surface cover 16A. It is constituted by a right side cover 16C that falls.

  The left side cover 16B is disposed on one surface of the revolving frame 5 in the left and right directions, that is, on the left side frame 5D, and can be opened and closed with, for example, a front portion as a fulcrum. That is, the left side cover 16B closes the left side of the heat exchange device upstream chamber 17 described later so as to be openable and closable.

  The heat exchange device upstream chamber 17 is provided between the cab 13 and the counterweight 6. That is, the heat exchange device upstream chamber 17 is located upstream of the heat exchange device 12 with respect to the flow direction of the cooling air supplied to the heat exchange device 12. The heat exchange device upstream chamber 17 is a space surrounded by the building 16 and a front partition plate 24 and a rear partition plate 25 described later.

  Specifically, the heat exchanger upstream chamber 17 is closed at the top by the upper surface cover 16 </ b> A of the building 16, closed at the front by the front partition plate 24, and closed at the rear by the rear partition plate 25. The left side of the heat exchange device upstream chamber 17 is closed by a left side cover 16B so as to be opened and closed. On the other hand, the heat exchange device 12 is disposed on the right side of the heat exchange device upstream chamber 17.

  The first battery 18 and the second battery 19 serving as batteries are located on the revolving frame 5 in the heat exchange device upstream chamber 17. The first and second batteries 18 and 19 serve as power sources for the engine 7 and various electric devices, and are arranged side by side in the left and right directions between the left side frame 5D and the heat exchange device 12.

  For the two batteries 18 and 19, for example, a general lead storage battery is used as a power storage device that stores electric charges. Each of the batteries 18 and 19 has housings 18A and 19A in which an electrolytic solution and a lead electrode plate are accommodated, and a negative terminal connected to the electrode plate is provided above the housings 18A and 19A. 18B and 19B and plus terminals 18C and 19C are provided.

  In this case, as shown in FIG. 11, the positive terminal 18C of the first battery 18 and the negative terminal 19B of the second battery 19 are connected by a connecting line 20, whereby the first battery 18 and the second battery 19 are connected to each other. They are connected in series. Further, the minus terminal 18B of the first battery 18 is electrically connected to the turning frame 5 via a grounding wire 23 and a disconnect switch 36 which will be described later. The positive terminal 19C of the second battery 19 is connected to, for example, a starter motor 11, a controller 44, various electric devices (not shown) (headlamps, various indicators, air conditioners, Connected to a load circuit of a radio etc.).

  One end of the load wiring 21 is connected to the plus terminal 19 </ b> C of the second battery 19. The other end of the load wiring 21 is branched into a plurality of lines and connected to a load circuit such as a starter motor 11, a controller 44, a headlamp, various displays, an air conditioner, and a radio.

  The main switch 22 is provided in the middle of the load wiring 21. The main switch 22 connects and disconnects the load wiring 21 by switching the key switch 13A in the cab 13. The main switch 22 is attached to, for example, a rear partition plate 25 described later.

  The grounding wire 23 connects the negative terminal 18B of the first battery 18 to the turning frame 5 that is a body ground. This grounding wire 23 is connected to a battery-side wire 23A having one end connected to the negative terminal 18B of the first battery 18 and the other end connected to a first terminal 37A2 of a switch body 37 constituting a disconnect switch 36 described later. The frame-side wiring 23B has one end connected to the second terminal 37A3 of the switch body 37 and the other end connected to the inclined portion 5F1 of the left rear extension beam 5F of the revolving frame 5 (see FIGS. 6, 7, and 11). It is comprised by.

  The front partition plate 24 is positioned between the front portion of the heat exchange device 12 and the rear surface of the cab 13 and extends upright in the left and right directions. The front partition plate 24 is formed of a plurality of plates that are erected on the revolving frame 5 so as to extend left and right between the right vertical plate 5C and the left side frame 5D.

  Next, the rear partition plate 25 according to the present embodiment will be described.

  The rear partition plate 25 faces the front partition plate 24 with an interval in the front and rear directions and extends from the rear portion of the heat exchange device 12 along the center surface 6B1 and the left inclined surface 6B2 of the counterweight 6. The rear partition plate 25 cooperates with the front partition plate 24 to guide the cooling air flowing from the outside toward the heat exchange device 12. The rear partition plate 25 includes a cooling air guide part 26 that faces the center surface 6B1 and the left inclined surface 6B2 of the counterweight 6, and an air cleaner attachment part 32 that protrudes from the cooling air guide part 26 toward the heat exchanger upstream chamber 17 side. The switch mounting part 34 is located below the air cleaner mounting part 32.

  As shown in FIGS. 5 and 9, the cooling air guide portion 26 includes a horizontal plate 26 </ b> A extending left and right along the center surface 6 </ b> B <b> 1 of the counterweight 6, and the counterweight 6 from the left end side of the horizontal plate 26 </ b> A. An inclined plate 26B extending along the left inclined surface 6B2. Four through holes 26A1 are provided on the right end side of the horizontal plate 26A so as to be spaced apart upward and downward. As shown in FIG. 6, the horizontal plate 26 </ b> A is attached to the heat exchange device 12 by inserting bolts 27 into the through holes 26 </ b> A <b> 1 and screwing the bolts 27 to the rear side of the support frame body 12 </ b> A of the heat exchange device 12.

  Two female screw holes 26B3 penetrating from the front surface 26B1 to the rear surface 26B2 are provided in the middle of the upper and lower sides of the inclined plate 26B so as to be spaced apart in the left and right directions. The main switch 22 can be attached to the front surface 26B1 of the inclined plate 26B by screwing the bolt 28 into the female screw hole 26B3 (see FIG. 7).

  On the lower end side of the inclined plate 26B, two through holes 26B4 are provided so as to be spaced apart in the left and right directions. Since the through hole 26B4 is provided in the inclined portion 5F1 of the left rear projecting beam 5F, it is provided at a position corresponding to the screw hole 5F2. The inclined plate 26B is attached to the left rear extension beam 5F by inserting the bolt 29 through the through hole 26B4 and screwing it into the female screw hole 5F2 (see FIG. 6). An insertion hole 26 </ b> C through which an intake pipe 7 </ b> B that guides outside air taken in by the air cleaner 9 toward the engine 7 is provided at a boundary portion on the upper end side between the horizontal plate 26 </ b> A and the inclined plate 26 </ b> B.

  A flange portion 30 bent forward is provided on the upper end side of the inclined plate 26B. The flange portion 30 is provided with two female screw holes 30A spaced apart in the left and right directions. Then, by placing the upper surface cover 16A of the building 16 on the upper surface of the flange portion 30 and screwing the bolt 31 into the female screw hole 30A, the left side of the upper surface cover 16A is attached to the flange portion 30 (FIG. 4). FIG. 6).

  The air cleaner mounting portion 32 extends from the upper left end of the inclined plate 26B toward the left front (left side cover 16B side). This air cleaner attachment portion 32 is a structure for attaching the air cleaner 9 disposed in the upstream chamber 17 of the heat exchange device. The air cleaner mounting portion 32 includes an air cleaner mounting plate 32A that protrudes obliquely forward to the left from the upper left end of the inclined plate 26B, an upper plate 32B that is bent from the upper end of the air cleaner mounting plate 32A toward the left rear, The lower plate 32C that faces the plate 32B and bends from the lower end of the air cleaner mounting plate 32A toward the left rear is formed in a substantially U-shape.

  In the air cleaner mounting portion 32, for example, an air cleaner mounting plate 32A is fixed to the left end of the inclined plate 26B by welding or the like, and a lower plate 32C is fixed to the upper end of a switch mounting portion 34 described later by welding or the like. The air cleaner mounting plate 32A is provided with four through holes 32A1. The air cleaner 9 is attached to the air cleaner attachment portion 32 by screwing the bolts 33 inserted into the respective through holes 32A1 into female screw holes (not shown) of the air cleaner 9.

  The switch attachment portion 34 is formed below the air cleaner attachment portion 32 so as to protrude from the left end of the inclined plate 26B toward the heat exchanger upstream chamber 17 side. This switch mounting part 34 is a part to which a disconnect switch 36 described later is attached. The switch mounting portion 34 includes a protruding plate 34A, a switch mounting plate 34B, an extension plate 34C, and a notch 34E.

  The protruding plate 34A is a rectangular plate that is long in the upward and downward directions, and is bent from the left end of the inclined plate 26B on the lower side of the lower plate 32C of the air cleaner mounting portion 32 and protrudes forward. In this case, the length dimension (protrusion amount) in the front and rear directions of the protrusion plate 34A is larger than the length dimension (thickness dimension) in the front and rear directions of the accommodation space side cover 42 of the disconnect switch 36 described later. Is formed.

  The switch mounting plate 34B extends from the front end of the projecting plate 34A to the left (left side frame 5D side) by bending at a substantially right angle, and stands from the left side frame 5D toward the lower plate 32C of the air cleaner mounting portion 32. It extends upward and downward so as to rise. A heat exchanging device upstream chamber side cover 38 of a later-described disconnect switch 36 is attached to the front surface 34B1 of the switch mounting plate 34B, and an accommodation space side cover 42 of the disconnect switch 36 is attached to the rear surface 34B2.

  In this case, as shown in FIG. 5, the protrusion plate 34 </ b> A and the switch mounting plate 34 </ b> B accommodate the rear side of the disconnect switch 36 described later between the counterweight 6 and the rear partition plate 25. A space 35 can be formed.

  As shown in FIGS. 8 and 9, the switch mounting plate 34B is located on the upper side of the notch 34E, and is provided with a screw hole 34B3 for fixing a nut, a screw seat or the like by welding or the like, for example, on the front surface 34B1 side. ing. The female screw hole 34B3 is for attaching a storage space side cover 42 described later to the rear surface 34B2 of the switch mounting plate.

  Further, on the upper side of the female screw hole 34B3, for example, a screw hole 34B4 is provided for fixing a nut, a screw seat or the like to the rear surface 34B2 side by welding or the like. This female screw hole 34B4 is for attaching a heat exchange device upstream chamber side cover 38, which will be described later, to the front surface 34B1 of the switch mounting plate 34B.

  On the lower end side of the switch mounting plate 34B, for example, a screw hole 34B5 is provided for fixing a nut, a screw seat or the like to the front surface 34B1 side by welding or the like. The switch mounting plate 34B is mounted on the left side frame 5D by screwing a bolt (not shown) into the female screw hole 34B5.

  The extension plate 34C extends forward from the left end of the switch mounting plate 34B, and rises from the left side frame 5D toward the lower plate 32C of the air cleaner mounting portion 32. A bracket 34D (see FIG. 8) that protrudes toward the right side and extends downward is fixed to the front end side of the right surface 34C1 of the extension plate 34C by welding or the like. The bracket 34D is provided with two female screw holes 34D1 for attaching a heat exchange device upstream chamber side cover 38, which will be described later, spaced upward and downward.

  The notch 34E is formed below the protruding plate 34A and the switch mounting plate 34B. A switch main body 37 of a disconnect switch 36, a battery side wiring 23A, and a frame side wiring 23B, which will be described later, are inserted into the notch 34E.

  The accommodation space 35 is formed between the rear partition plate 25 and the counterweight 6. The accommodation space 35 is formed in a substantially triangular cross section by causing a part of the rear partition plate 25 to protrude toward the heat exchange device upstream chamber 17 side. Specifically, the accommodation space 35 is formed by a switch mounting portion 34 that protrudes from the cooling air guide portion 26 of the rear partition plate 25 toward the heat exchange device upstream chamber 17 side.

  That is, the accommodation space 35 includes a protruding plate 34A protruding from the left end of the inclined plate 26B of the rear partition plate 25 toward the front (the heat exchange device upstream chamber 17 side), and from the front end of the protruding plate 34A toward the left. A space surrounded by the extending switch mounting plate 34 </ b> B and the front surface 6 </ b> B of the counterweight 6 is formed. The accommodation space 35 accommodates a first terminal 37A2 and a second terminal 37A3 of a switch body 37 that forms a part of a disconnect switch 36 described later, and an accommodation space side cover 42.

  The disconnect switch 36 is provided in the middle of the wiring path of the ground wiring 23. As shown in FIG. 11, the disconnect switch 36 electrically energizes (connects) and disconnects between the minus terminal 18 </ b> B of the first battery 18 and the turning frame 5.

  The disconnect switch 36 is used when the power is completely turned off so as not to cause a short circuit when the electric wiring is repaired, the first and second batteries 18 and 19 are replaced, or until the next operation of the excavator 1. When the power is completely turned off to suppress the discharge of the batteries 18 and 19 for a long period of time, the first battery 18 and the swing frame 5 are electrically disconnected. Further, the disconnect switch 36 can also be used when the hydraulic excavator 1 is urgently stopped from the outside. The disconnect switch 36 includes a switch body 37, a heat exchange device upstream chamber side cover 38, and a storage space side cover 42, which will be described later.

  The switch main body 37 constitutes the main body of the disconnect switch 36. The switch body 37 includes a case 37A having a built-in contact that is turned on and off by an external operation, and a switch switching unit in which a base end side is rotatably mounted around the axis of the case 37A and a distal end side is bent at a substantially right angle. It is comprised by the lever 37B. The switch switching lever 37B is, for example, in a state of being tilted in the horizontal direction by turning on a contact in the case 37A to be in a connected state, and in a state of being turned up and turned up to turn off the contact in the case 37A. It is what.

  As shown in FIG. 8, the case 37A is provided with a mounting flange 37A1 located on the switch switching lever 37B side. The mounting flange 37A1 is provided with bolt insertion holes (not shown) in the upward and downward directions with the switch switching lever 37B interposed therebetween. On the other hand, as shown in FIG. 6, the first terminal 37A2 and the second terminal 37A3 are provided on the opposite side of the case 37A from the switch switching lever 37B. The first terminal 37A2 is connected to the battery side wiring 23A of the grounding wiring 23, and the second terminal 37A3 is connected to the frame side wiring 23B.

  The heat exchange device upstream chamber side cover 38 is a switch cover that covers the front side of the switch body 37 (the heat exchange device upstream chamber 17 side). The heat exchange device upstream chamber side cover 38 is located on the heat exchange device upstream chamber 17 side, and a portion of the switch body 37 that protrudes from the switch mounting plate 34B to the heat exchange device upstream chamber 17 side, that is, the switch body. The switch switching lever 37B side of 37 is accommodated, and the switch body 37 is mounted on the switch mounting portion 34 of the rear partition plate 25. The heat exchanger upstream chamber side cover 38 is formed by a top plate 38A, a front plate 38B, and a right plate 38C as a box-like body that is open on the rear side, the left side, and the lower side.

  A mounting plate 38D protruding upward is provided at the rear end of the upper plate 38A. The mounting plate 38D is provided with two through holes 38D1 spaced apart in the left and right directions. These through holes 38D1 are arranged corresponding to the female screw holes 34B4 of the switch mounting plate 34B.

  On the other hand, the front plate 38B has a lever insertion hole 38B1 located at the center thereof, an upper portion sandwiching the lever insertion hole 38B1, two through holes 38B2 at the lower position, and an upper portion on the left end side of the front plate 38B. Two through holes 38B3 are formed so as to be spaced downward. In this case, a part of the switch body 37 is accommodated in the heat exchanger upstream chamber side cover 38 by inserting the switch switching lever 37B into the lever insertion hole 38B1. In this state, the switch body 37 is fixed to the heat exchange device upstream chamber side cover 38 by inserting the bolt 39 inserted into the bolt insertion hole of the mounting flange 37A1 of the case 37A into the through hole 38B2 and screwing the nut 40. can do.

  Then, as shown in FIGS. 7 and 8, the heat exchange device upstream chamber side cover 38 inserts the bolt 41 into the through hole 38B3 of the front plate 38B and is screwed into the female screw hole 34D1 of the bracket 34D. The other bolt 41 is inserted into the through hole 38D1 of the mounting plate 38D and screwed into the female screw hole 34B4 of the switch mounting plate 34B, so that it is mounted together with the disconnect switch 36 on the front surface 34B1 of the switch mounting plate 34B. Can do.

  In this case, the rear side (the first terminal 37A2 and the second terminal 37A3 side) of the case 37A of the switch body 37 is in a state of protruding from the cutout portion 34E of the switch mounting plate 34B toward the accommodation space 35. Therefore, the heat exchange device upstream chamber side cover 38 is configured to accommodate only a part of the switch body 37 on the switch switching lever 37B side. Therefore, the heat exchanging device upstream chamber side cover 38 can make the thickness dimension A of the portion protruding from the switch mounting plate 34B toward the heat exchanging device upstream chamber 17 as small as possible (see FIG. 5). As a result, the heat exchange device upstream chamber side cover 38 can reduce the projecting dimension from the front surface 34B1 of the switch mounting plate 34B toward the heat exchange device upstream chamber 17.

  Thereby, the disconnect switch 36 can be disposed in the narrow heat exchange device upstream chamber 17. Further, the disconnect switch 36 does not get in the way when performing maintenance work or replacement work for the first battery 18, the second battery 19, and other devices disposed in the heat exchange device upstream chamber 17. The workability can be improved.

  The accommodation space side cover 42 is a switch cover that covers the rear side (the accommodation space 35 side) of the switch body 37. The accommodation space side cover 42 is located on the accommodation space 35 side and accommodates the first terminal 37A2 and the second terminal 37A3 side therein. The accommodation space side cover 42 is formed as a box-like body having an opening on the front side and the lower side by the upper plate 42A, the rear plate 42B, the left plate 42C, and the right plate 42D.

  A mounting plate 42E protruding upward is provided at the front end of the upper plate 42A. The mounting plate 42E is provided with two through holes 42E1 that are spaced apart in the left and right directions. These through holes 42E1 are arranged corresponding to the female screw holes 34B3 of the switch mounting plate 34B.

  As shown in FIGS. 6 and 8, the accommodation space side cover 42 is inserted into the through hole 42E1 of the mounting plate 42E through the bolt 43 and screwed into the female screw hole 34B3 of the switch mounting plate 34B. It can be mounted on the rear surface 34B2 of the switch mounting plate 34B.

  Here, the switch cover that covers the switch body 37 is positioned on the accommodation space 35 side with the heat exchange device upstream chamber side cover 38 positioned on the heat exchange device upstream chamber 17 side and the switch mounting plate 34B of the rear partition plate 25 interposed therebetween. It is comprised by two members with the accommodation space side cover 42 to do. Thus, by dividing the switch cover into two parts, the two covers 38 and 42 can reliably cover the switch body 37.

  Further, a left recessed portion 6 </ b> C formed on the left inclined surface 6 </ b> B <b> 2 of the counterweight 6 is disposed behind the accommodation space side cover 42. Thereby, a space can be secured between the disconnect switch 36 and the counterweight 6. Therefore, even when the counterweight 6 swings and approaches the disconnect switch 36 during operation during traveling, the counterweight 6 can be prevented from contacting the disconnect switch 36.

  The controller 44 shown in FIG. 11 constitutes a load circuit, and controls various devices when the excavator 1 is run or excavation work is performed. Similar to the starter motor 11, the controller 44 is connected to the plus terminal 19C of the second battery 19 via the load wiring 21 and the main switch 22, and is connected to the turning frame 5 via the other ground wiring 44A. ing.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic excavator 1 will be described.

  The operator gets on the cab 13 and sits on the driver's seat. By operating the key switch 13A in this state, the engine 7 is started by the starter motor 11 and the hydraulic pump 8 is driven. When the hydraulic pump 8 is driven to secure the pressure oil as the power source, the operator operates the accelerator pedal and the steering wheel to drive the lower traveling body 2 to move the hydraulic excavator 1 forward or backward. Can do. On the other hand, the operator seated in the driver's seat can perform soil excavation work and the like by moving the front device 4 up and down by operating the operation lever.

  Next, the case where the maintenance work and exchange work of the 1st, 2nd batteries 18 and 19 arrange | positioned in the heat exchange apparatus upstream chamber 17 is demonstrated.

  First, the operator switches off the key switch 13A in the cab 13. Next, the left side cover 16B of the building 16 is opened, the switch switching lever 37B of the disconnect switch 36 attached to the switch attachment portion 34 of the rear partition plate 25 is turned upward, and the first battery 18 is started up. The negative terminal 18B and the revolving frame 5 are electrically disconnected. Thereby, the power supply of the 1st, 2nd batteries 18 and 19 can be turned off completely. The operator can perform maintenance work and replacement work on the first and second batteries 18 and 19.

  In this case, in the prior art described above, the disconnect switch protrudes greatly from the mounting plate toward the upstream chamber of the heat exchange device. Therefore, when performing maintenance work or replacement work of the first and second batteries, there is a problem that the disconnect switch becomes an obstacle and workability is lowered. Furthermore, the small swivel hydraulic excavator has a problem that workability is further deteriorated because the upstream chamber of the heat exchange device is narrow.

  On the other hand, in the present embodiment, the disconnect switch 36 has a rear space side (first and second terminals 37A2, 37A3 side) from the heat exchanger upstream chamber 17 through the cutout portion 34E of the switch mounting plate 34B. In a state of projecting to the side, the switch is attached to the switch mounting plate 34B of the rear partition plate 25. Thereby, the disconnect switch 36 can reduce the protrusion dimension (thickness dimension A) from the switch mounting plate 34 </ b> B toward the heat exchange device upstream chamber 17.

  Thus, according to the first embodiment, the rear partition plate 25 that partitions the heat exchanger upstream chamber 17 and the counterweight 6 is protruded from the cooling air guide portion 26 toward the heat exchanger upstream chamber 17 side. A switch mounting portion 34 is formed. As a result, an accommodation space 35 can be formed between the rear partition plate 25 and the counterweight 6, and a part of the rear side of the disconnect switch 36 (counterweight 6 side) is formed in the accommodation space 35. Can be accommodated.

  That is, the disconnect switch 36 can be mounted on the switch mounting portion 34 of the rear partition plate 25 in a state where the disconnect switch 36 protrudes into the accommodation space 35 formed between the rear partition plate 25 and the counterweight 6. Therefore, the disconnect switch 36 can reduce the projecting dimension (thickness dimension A) from the rear partition plate 25 to the heat exchange device upstream chamber 17 side.

  As a result, even when the disconnect switch 36 is provided in the narrow heat exchange device upstream chamber 17, a space for maintenance and replacement of the devices such as the first and second batteries 18 and 19 is secured. It is possible to improve workability. Moreover, since the first terminal 37A2 and the second terminal 37A3 provided on the case 37A of the switch body 37 can be arranged on the rear side (the accommodation space 35) of the rear partition plate 25, it is possible to suppress erroneous touching, Safety can be improved.

  Further, the switch cover constituting the disconnect switch 36 is formed by being divided by the heat exchange device upstream chamber side cover 38 and the accommodation space side cover 42. Thus, by dividing the switch cover into two parts, the two covers 38 and 42 can reliably cover the switch body 37. Accordingly, it is possible to prevent rainwater and dust from adhering to the switch body 37 and to suppress the life of the switch body 37 from being reduced.

  Further, a left recessed portion 6 </ b> C formed on the left inclined surface 6 </ b> B <b> 2 of the counterweight 6 is located behind the accommodation space side cover 42. Thereby, a space can be secured between the disconnect switch 36 and the counterweight 6. Therefore, even when the counterweight 6 swings and approaches the disconnect switch 36 at the time of traveling and working, it is possible to suppress the counterweight 6 from coming into contact with the disconnect switch 36. Reliability and stability can be improved.

  Next, FIG. 12 shows a second embodiment of the present invention. The feature of this embodiment is that the disconnect switch protrudes into the recessed portion of the counterweight. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The disconnect switch 51 is used in place of the disconnect switch 36 according to the first embodiment. The disconnect switch 51 includes a switch body 37, a heat exchange device upstream chamber side cover 52, and an accommodation space side cover 53 in substantially the same manner as the disconnect switch 36 according to the first embodiment. In this case, the disconnect switch 51 according to the second embodiment is formed to have a longer thickness dimension (front and rear length dimensions) than the disconnect switch 36 according to the first embodiment. Yes.

  The heat exchange device upstream chamber side cover 52 is a switch cover that covers the front side of the switch body 37 (the heat exchange device upstream chamber 17 side). The heat exchange device upstream chamber side cover 52 is located on the heat exchange device upstream chamber 17 side, and a portion of the switch body 37 that protrudes from the switch mounting plate 34B to the heat exchange device upstream chamber 17 side, that is, the switch body. The switch switching lever 37B side of 37 is accommodated, and the switch body 37 is mounted on the switch mounting portion 34 of the rear partition plate 25.

  The accommodation space side cover 53 is a switch cover that covers the rear side (the accommodation space 35 side) of the switch body 37. The accommodation space side cover 53 is located on the accommodation space 35 side and accommodates the first terminal 37A2 and second terminal 37A3 side of the switch body 37 therein.

  A left recessed portion 6C is formed on the left inclined surface 6B2 of the counterweight 6 at a position corresponding to the disconnect switch 51. The accommodation space side cover 53 is configured to protrude from the accommodation space 35 into the left recessed portion 6 </ b> C of the counterweight 6 while being attached to the switch mounting plate 34 </ b> B of the rear partition plate 25. That is, the disconnect switch 51 is mounted on the switch mounting portion 34 of the rear partition plate 25 in a state of protruding (penetrating) from the heat exchange device upstream chamber 17 into the accommodation space 35 and further protruding into the left recessed portion 6C. It has been. Thereby, the heat exchange apparatus upstream chamber side cover 52 can make the thickness dimension B as small as possible.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, the disconnect switch 51 protrudes into the left recessed portion 6C of the counterweight 6 through the accommodating space 35, and therefore the disconnect switch 51 from the switch mounting plate 34B. The projecting dimension of can be made smaller. As a result, even when the disconnect switch 51 is disposed in the narrow heat exchange device upstream chamber 17, a space for maintenance and replacement of the devices such as the first and second batteries 18 and 19 is secured. It is possible to improve workability.

  In the first embodiment described above, the case where the switch main body 37 of the disconnect switch 36 is provided with the switch switching lever 37B to be rotated is described as an example. However, the present invention is not limited to this. For example, another switch switching member such as a push button may be used. The same applies to the second embodiment.

  Moreover, in each embodiment mentioned above, it demonstrated taking the case of the 1st, 2nd batteries 18 and 19 which consist of lead acid batteries as an electrical storage apparatus. However, the present invention is not limited to this. For example, another storage battery such as a lithium ion storage battery may be used as the power storage device.

  Furthermore, in each embodiment, the small turning type wheel type hydraulic excavator 1 was 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 crawler excavator and a hydraulic crane. Furthermore, the present invention can be applied to an electric construction machine in which a hydraulic pump is driven by an electric motor and a hybrid construction machine in which an engine and an electric motor are mounted.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Front device 4G Foot part 5 Revolving frame (support structure)
6 Counterweight 6B Front 6B2 Left inclined surface 6C Left recess 7 Engine 7A Cooling fan 12 Heat exchange device 13 Cab 14 Hydraulic oil tank (oil storage tank)
15 Fuel tank (oil storage tank)
16 Building 16A Top Cover 16B Left Side Cover 16C Right Side Cover 17 Heat Exchanger Upstream Chamber 18 First Battery (Battery)
19 Second battery (battery)
24 Front partition plate 25 Rear partition plate 34 Switch mounting part 35 Housing space 36, 51 Disconnect switch 37 Switch body 38, 52 Heat exchange device upstream chamber side cover (switch cover)
42, 53 Housing space side cover (switch cover)

Claims (3)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be capable of swiveling, and a front device provided on the upper revolving body so as to be able to move up and down,
The upper swing body is
A revolving frame in which a support structure for attaching to the lower traveling body is formed, and a foot portion of the front device is attached to an intermediate portion in the left and right directions on the front side of the support structure;
A counterweight that is provided at the rear end of the revolving frame to balance the weight with the front device and has an inclined surface in which at least one side in the left and right directions of the front side is inclined forward.
An engine mounted on the front side of the counterweight in a horizontally placed state extending in the left and right directions at the rear of the revolving frame;
A cooling fan arranged on one side of the engine in the left and right directions and sucking outside air as cooling air;
A heat exchange device disposed facing the cooling fan so as to be located upstream of the cooling fan in the flow direction of the cooling air;
A cab provided on the front side of the engine and on one side of the left and right directions across the foot portion of the front device;
An oil storage tank provided on the front side of the engine and on the other side in the left and right directions across the foot portion of the front device;
A building that covers the engine and the mounted equipment including the heat exchange device, which is composed of left and right side covers and a top cover, located between the counterweight, the cab, and the oil storage tank;
A front partition plate located between the front portion of the heat exchange device and the rear surface of the cab and extending in the left and right directions;
A front partition plate facing the front partition plate in the front and rear directions with a gap extending from the rear portion of the heat exchange device along the front surface of the counterweight;
A heat exchanger upstream chamber located on the upstream side of the heat exchanger with respect to the flow direction of the cooling air supplied to the heat exchanger, and surrounded by the building and the partition plates;
A battery located in the upstream chamber of the heat exchanger and provided on the swivel frame and serving as a power source for the engine and various electrical devices;
In a construction machine comprising a disconnect switch for energizing or shutting off the battery with respect to the engine and the electric device,
The rear partition plate is formed with a switch mounting portion having a storage space between the rear partition plate and the counterweight by projecting toward the heat exchange device upstream chamber side,
The construction machine is characterized in that the disconnect switch is mounted on the switch mounting portion in a state of protruding into the accommodating space. The disconnect switch includes a switch body and a switch cover that covers the switch body.
The switch cover is located on the heat exchange device upstream chamber side and attached to the rear partition plate, and the heat exchange device upstream chamber side cover is located on the accommodation space side and attached to the rear partition plate. The construction machine according to claim 1, wherein the construction machine is formed by being divided into a cover. On the inclined surface of the counterweight, a recess is formed at a position facing the disconnect switch,
The construction machine according to claim 1 or 2, wherein the disconnect switch is configured to protrude into the recessed portion in a state of being attached to the switch attachment portion.

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