JP2017071910A - Shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shovel, which is equipped with electric drive components such as an electric power storage unit and a drive unit as well as a liquid reducing agent tank reserving a processing agent to be supplied to an exhaust gas processor of a diesel engine, which are collectively disposed in a right-front area of an upper swing structure; thereby easy-to-step up/down stairs can be provided.SOLUTION: The shovel has an upper swing structure, in a right-front area of which electric drive components 18, 19 and 100, an exhaust gas processor, a reservation tank 200 of a processing agent for the exhaust gas processor, and an up/down step 260 are mounted. The electric drive components 18,19 and 100 are disposed while being piled up in a front-down or right-up step-like shape; and the up/down step is formed in an affront down or right up mode along the disposition of the electric drive components. The reservation tank 200 is disposed out of a path of the up/down step.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an excavator including an exhaust gas processing device that processes engine exhaust gas using a processing agent (urea aqueous solution).

  2. Description of the Related Art Conventionally, a hybrid excavator including an electric motor (assist motor) that assists an engine that is a driving force source of a hydraulic pump and an electric motor (rotation motor) that drives an upper swing body to rotate is known.

  In addition to the configuration of the excavator that uses only the engine as a power source, the hybrid excavator is supplied from a power storage device (for example, a battery or a capacitor) that supplies electric power to the motor, or from the power storage device. A driving device (for example, an inverter or a converter) that drives an electric motor using electric power is included. A hybrid excavator usually follows an excavator structure that uses only an engine as a power source, and often adds an electric motor, a power storage device, a drive device, and the like. It is necessary to secure a place for additionally mounting a driving device (hereinafter referred to as an electric driving component) in the upper swing body.

  In view of this, a hybrid excavator has been proposed in which these power storage devices and drive devices are arranged on the right front portion of the upper swing body (see, for example, Patent Document 1).

  In Patent Document 1, a power storage device, a drive device, and the like are configured in a staircase shape, stored in an equipment case, and arranged in the right front portion of the upper swing body as an ascending / descending step for maintenance of an engine room or the like.

  In addition, the excavator is often equipped with a diesel engine as a power source. In recent years, diesel engines are required to comply with higher-order exhaust gas regulations, and therefore, an exhaust gas processing device that complies with such higher-order exhaust gas regulations is installed.

  As such an exhaust gas processing apparatus, a urea selective reduction type NOx processing apparatus using a urea aqueous solution (liquid reducing agent) as a processing agent is often used. An aqueous urea solution (hereinafter simply referred to as “urea water”) is stored in a liquid reducing agent tank, and the liquid reducing agent tank is connected to an exhaust pipe by a liquid reducing agent supply pipe. The urea water in the liquid reducing agent tank is supplied to the exhaust pipe of the diesel engine by the liquid reducing agent supply pump (see, for example, Patent Document 2).

JP 2012-172332 A JP 2013-160005 A

  By the way, when mounting an exhaust gas treatment device on a hybrid type excavator, in addition to the place where electric drive parts necessary for hybridization are mounted, following the structure of the excavator that uses only a diesel engine as a power source, It is necessary to secure a place for additionally mounting an exhaust gas treatment device, in particular, an accompanying relatively large volume liquid reducing agent tank in the upper swing body.

  Usually, from the center part to the rear part of the upper revolving structure, main components such as a fuel tank, a hydraulic oil tank, a diesel engine, and a cooling unit that are also mounted on a shovel that uses only the engine as a power source are arranged. Therefore, the electric drive parts necessary for hybridization and the liquid reductant tank necessary for mounting the exhaust gas treatment device are located at the right front part of the upper swing body as in the electric drive parts described in Patent Document 1. It is possible to arrange.

  However, when the electric drive component and the urea water tank are arranged at the right front part of the upper swing body, the dimensions of the urea water tank in the height direction are often relatively large. For this reason, if the electric drive component and the urea water tank are configured in a step shape and the lifting step is configured by a lifting path passing above the urea water tank, it may be difficult to move up and down.

  Accordingly, in view of the above problems, an electric drive component such as a power storage device or a drive device and a liquid reducing agent tank for storing a treatment agent to be supplied to an exhaust gas treatment device for treating exhaust gas of a diesel engine are provided on the right side of the upper swing body. An object of the present invention is to provide an excavator that can be provided with an elevating step that is easier to move up and down when arranged in a centralized manner.

In order to achieve the above object, in one embodiment, the excavator is:
An upper swing body,
A cabin provided at a left front portion of the upper swing body,
A diesel engine mounted at the rear of the upper swing body,
An electric motor mounted on the rear of the upper rotating body adjacent to the diesel engine and assisting the diesel engine;
An electric drive component mounted on the right front part of the upper swing body for driving the electric motor,
An exhaust gas treatment device for treating the exhaust gas of the diesel engine using a treatment agent;
A storage tank that is mounted on the right front of the upper swing body and stores the treatment agent;
Elevating step provided at the right front part of the upper swing body,
The electric drive parts are arranged in a manner of being stacked in a step-down manner of front-down or right-down,
The elevating step is formed in a front-down or right-down manner along the arrangement of the electric drive parts,
The storage tank is disposed off the lifting path of the lifting step.

  According to the above-described embodiment, the liquid reductant tank that stores the electric drive components such as the power storage device and the drive device, and the treatment agent supplied to the exhaust gas treatment device that treats the exhaust gas of the diesel engine is provided on the right side of the upper swing body. An excavator that can be provided with an elevating step that is easier to move up and down when arranged in the front portion can be provided.

It is a side view of an excavator It is a figure which shows an example of a structure of the drive system of an shovel. It is a figure which shows an example of a structure of the electrical storage system of an excavator. It is a figure which shows the structure of an exhaust-gas processing apparatus. It is the perspective view which looked at the urea water tank from diagonally upper right front. It is the disassembled perspective view which looked at the urea water tank from the diagonally upper left front. It is the perspective view which looked at the urea water tank from the diagonally lower left front. It is a top view of the upper revolving structure which shows the 1st example of arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on this embodiment. It is a right side view of the upper revolving unit showing the first example of the arrangement of the electric drive parts and the urea water tank in the excavator according to the present embodiment. FIG. 10 is a perspective view of the right front portion of the upper swing body in the excavator shown in FIGS. 8 and 9. It is a top view of the upper revolving structure which shows arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on a comparative example. It is a right view of the upper turning body which shows arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on a comparative example. It is a perspective view of the right front part of the upper revolving structure in the shovel which concerns on a comparative example. It is a top view of the upper revolving structure which shows the 2nd example of arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on this embodiment. It is a right view of the upper turning body which shows the 2nd example of arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on this embodiment. It is a perspective view of the right front part of the upper revolving structure in the shovel shown in FIGS. It is a top view of the upper turning body which shows the 3rd example of arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on this embodiment. It is a right view of the upper turning body which shows the 3rd example of arrangement | positioning of the electric drive components and urea water tank in the shovel which concerns on this embodiment. It is front sectional drawing of the right front part of the upper turning body in the shovel shown in FIG. 17, FIG. It is a perspective view of the right front part of the upper revolving structure in the shovel shown in FIGS. It is a top view of the upper revolving structure which shows the 4th example of arrangement of the electric drive parts and urea water tank concerning this embodiment. It is a right view of the upper turning body which shows the 4th example of arrangement | positioning of the electric drive component and urea water tank which concerns on this embodiment. It is front sectional drawing of the right front part of the upper turning body in the shovel shown to FIG. 21, FIG. It is a perspective view of the right front part of the upper revolving structure in the shovel shown in FIGS.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

  First, the basic configuration of the excavator according to the present embodiment will be described with reference to FIGS.

  FIG. 1 is a side view showing an excavator according to the present embodiment.

  As shown in FIG. 1, an upper swing body 3 is mounted on a lower traveling body 1 of an excavator via a swing mechanism 2. A boom 4 is attached to the upper swing body 3. An arm 5 is attached to the tip of the boom 4, and a bucket 6 is attached to the tip of the arm 5. The boom 4, the arm 5 and the bucket 6 as attachments are hydraulically driven by a boom cylinder 7, an arm cylinder 8 and a bucket cylinder 9 as hydraulic actuators, respectively. Further, the upper swing body 3 is provided with a cabin 10 on which an operator boardes, and a diesel engine 11 (see FIG. 8 and the like) described later and the like are mounted.

  In the present specification, the “front portion” of the upper swing body 3 means a portion on the side where the boom 4 is attached as viewed from the center of the upper swing body 3. Further, “front” means a direction in which the boom 4 extends as viewed from the center of the upper swing body. Further, “left side” means a portion that becomes the left when facing the front (the direction in which the boom 4 extends) in the upper swing body 3. Further, the “right side” means a portion that is on the right when facing the front (the direction in which the boom 4 extends) in the upper swing body 3.

  FIG. 2 is a block diagram showing the configuration of the excavator drive system. In the figure, the mechanical power system is indicated by a double line, the high-pressure hydraulic line is indicated by a thick solid line, the pilot line is indicated by a broken line, and the electric drive / control system is indicated by a thin solid line.

  A diesel engine 11 as a main drive unit and a motor generator 12 as an assist drive unit in the shovel according to the present embodiment are connected to two input shafts of a speed reducer 13, respectively. A main pump 14 and a pilot pump 15 are connected to the output shaft of the speed reducer 13. A control valve 17 is connected to the main pump 14 via a high pressure hydraulic line 16. The main pump 14 is, for example, a variable displacement hydraulic pump, and can control the discharge flow rate by adjusting the stroke length of the piston by controlling the angle (tilt angle) of the swash plate. The pilot pump 15 is, for example, a fixed displacement hydraulic pump.

  The control valve 17 is a control device that controls the hydraulic system in accordance with an operation on the operation device 26. The hydraulic motors 1A (for right) and 1B (for left), the boom cylinder 7, the arm cylinder 8, and the bucket cylinder 9 for the lower traveling body 1 are connected to the control valve 17 via a high-pressure hydraulic line.

  The motor generator 12 is connected to a power storage system 120 including a capacitor 19 (see FIG. 3) as a power storage device via an inverter 18A. An operation device 26 is connected to the pilot pump 15 through a pilot line 25. The operating device 26 includes levers 26A and 26B and a pedal 26C. The levers 26A and 26B and the pedal 26C are connected to the control valve 17 and the pressure sensor 29 via the hydraulic line 27 and the hydraulic line 28, respectively. The pressure sensor 29 is connected to the controller 30.

  In the shovel according to the present embodiment, the turning mechanism 2 is motorized, and the turning electric motor 21 that drives the turning mechanism 2 is provided. The turning electric motor 21 is connected to the power storage system 120 via the inverter 18B. A resolver 22, a mechanical brake 23, and a turning speed reducer 24 are connected to the rotating shaft 21 </ b> A of the turning electric motor 21.

  In the present embodiment, the inverters 18A and 18B are housed in the same casing. Hereinafter, a component in which the inverters 18A and 18B are integrated is referred to as an inverter 18.

  The controller 30 is a main control device that performs drive control in the shovel. The controller 30 is composed of an arithmetic processing unit including a CPU and a ROM, and various drive controls are realized by executing a drive control program stored in the ROM on the CPU.

  The controller 30 converts the signal supplied from the pressure sensor 29 into a speed command, and performs drive control of the turning electric motor 21. Note that the signal supplied from the pressure sensor 29 is a signal representing an operation amount in the operating device 26 for turning the turning mechanism 2.

  The controller 30 performs operation control of the motor generator 12 (switching between electric (assist) operation or power generation operation) and also drives and controls the buck-boost converter 100 (see FIG. 3). ) Charge / discharge control. The controller 30 is based on the charge state of the capacitor 19, the operation state of the motor generator 12 (electric (assist) operation or power generation operation), and the operation state of the turning motor 21 (power running operation or regenerative operation). The switching control between the step-up operation and the step-down operation is performed, whereby the charge / discharge control of the capacitor 19 is performed.

  FIG. 3 is a circuit diagram of the power storage system 120. The power storage system 120 includes a capacitor 19, a buck-boost converter 100, a DC bus 110, and the like. The DC bus 110 controls transmission and reception of electric power among the capacitor 19, the motor generator 12, and the turning electric motor 21. The capacitor 19 is provided with a capacitor voltage detector 112 that detects the voltage value and current value of the capacitor 19 and a capacitor current detector 113. The capacitor voltage value and the capacitor current value detected by the capacitor voltage detection unit 112 and the capacitor current detection unit 113 are supplied to the controller 30.

  The step-up / down converter 100 switches between the step-up operation and the step-down operation so that the DC bus voltage value falls within a certain range according to the operating state of the motor generator 12 and the turning electric motor 21. The DC bus 110 is disposed between the inverters 18 </ b> A and 18 </ b> B and the buck-boost converter 100, and the capacitor 19, the motor generator 12, and the turning electric motor 21 exchange power via the DC bus 110.

  Switching control between the step-up / step-down operation of the buck-boost converter 100 is performed by the DC bus voltage value detected by the DC bus voltage detection unit 111, the capacitor voltage value detected by the capacitor voltage detection unit 112, and the capacitor current detection unit 113. This is performed based on the detected capacitor current value.

  In the following, the inverter 18 (inverters 18A and 18B), the step-up / down converter 100, and the capacitor 19 may be collectively referred to as “electrically driven components”.

  Next, with reference to FIG. 4, the structure of the exhaust-gas processing apparatus 150 which processes the exhaust gas discharged | emitted from the diesel engine 11 is demonstrated.

  FIG. 4 is a diagram illustrating a configuration example of the exhaust gas processing device 150. In the present embodiment, the exhaust gas processing device 150 purifies the exhaust gas discharged from the diesel engine 11. The diesel engine 11 is controlled by an engine control module (hereinafter referred to as “ECM”) 60.

  Exhaust gas discharged from the diesel engine 11 flows to the exhaust pipe 62 through the turbocharger 61. Then, the exhaust gas flows into the exhaust gas processing device 150 from the exhaust pipe 62, and after being purified by the exhaust gas processing device 150, is exhausted to the atmosphere.

  On the other hand, the intake air introduced into the intake pipe 64 through the air cleaner 63 passes through the intercooler 65 included in the turbocharger 61 and the cooling unit 190 (see FIG. 8 and the like) and is supplied to the diesel engine 11.

  The exhaust pipe 62 is provided with a first exhaust processing unit and a second exhaust processing unit in series. The first exhaust treatment unit in the present embodiment is a diesel particulate filter (DPF: Diesel Particulate Filter) 66 that collects particulate matter in the exhaust gas. The second exhaust treatment unit is a selective reduction catalyst 67 that reduces and removes NOx in the exhaust gas.

  Note that the first exhaust treatment unit may be a diesel oxidation catalyst (DOC: Diesel Oxidation Catalyst).

  The selective reduction catalyst 67 receives the supply of the liquid reducing agent and removes NOx by continuously reducing NOx in the exhaust gas. In the present embodiment, urea water is used as the liquid reducing agent from the viewpoint of handleability.

  As a matter of course, other treatment agents other than urea water may be used as long as they can continuously reduce NOx.

  A urea water injection valve 68 for supplying urea water to the selective reduction catalyst 67 is provided upstream of the selective reduction catalyst 67 in the exhaust pipe 62. The urea water injection valve 68 is connected to the urea water tank 200 via a urea water supply pipe 69 (hereinafter simply referred to as “pipe 69”).

  The pipe 69 is provided with a urea water supply pump 70. A filter 71 is provided between the urea water tank 200 and the urea water supply pump 70. The urea water stored in the urea water tank 200 is supplied to the urea water injection valve 68 by the urea water supply pump 70. The urea water is injected into the exhaust pipe 62 from the urea water injection valve 68 at a position upstream of the selective reduction catalyst 67 in the exhaust pipe 62.

  The urea water injected from the urea water injection valve 68 is supplied to the selective reduction catalyst 67. The supplied urea water is hydrolyzed in the selective reduction catalyst 67 to generate ammonia. The produced ammonia reduces NOx contained in the exhaust gas within the selective reduction catalyst 67. Thereby, the exhaust gas discharged from the diesel engine 11 is purified.

  The first NOx sensor 72 is disposed on the upstream side of the urea water injection valve 68. The second NOx sensor 73 is disposed on the downstream side of the selective reduction catalyst 67. The first NOx sensor 72 and the second NOx sensor 73 detect the concentration of NOx contained in the exhaust gas at the respective arrangement positions.

  A urea water remaining amount sensor 74 is disposed in the urea water tank 200. The urea water remaining amount sensor 74 detects the remaining amount of urea water in the urea water tank 200.

  The first NOx sensor 72, the second NOx sensor 73, the urea water remaining amount sensor 74, the urea water injection valve 68, and the urea water supply pump 70 are connected to the exhaust gas controller 75. The exhaust gas controller 75 is configured to inject an appropriate amount of urea water by the urea water injection valve 68 and the urea water supply pump 70 based on the NOx concentrations detected by the first NOx sensor 72 and the second NOx sensor 73, respectively. Take control.

  The exhaust gas controller 75 calculates the ratio of the remaining amount of urea water to the total volume of the urea water tank 200 based on the remaining amount of urea water output from the urea water remaining amount sensor 74. In the present embodiment, the ratio of the remaining amount of urea water to the total volume of the urea water tank 200 is defined as the urea water remaining ratio. For example, the urea water remaining ratio of 50% indicates that urea water half the capacity of the urea water tank 200 remains in the urea water tank 200.

  The exhaust gas controller 75 is communicably connected to an ECM 60 that controls the diesel engine 11 via communication means (for example, a LAN that conforms to the CAN protocol). The ECM 60 is connected to the excavator controller 76 via communication means (for example, a LAN that conforms to the CAN protocol).

  Various types of information of the exhaust gas processing device 150 included in the exhaust gas controller 75 can be shared by the excavator controller 76. Each of the ECM 60, the exhaust gas controller 75, and the excavator controller 76 includes a CPU, a RAM, a ROM, an input / output port, a storage device, and the like.

  A monitor 77 (display device) is connected to the shovel controller 76. The monitor 77 displays information and data such as warnings and operating conditions.

  The excavator controller 76 may be the same as the controller 30.

  The exhaust gas processing device 150 has a freeze prevention mechanism that prevents the urea water tank 200 and the pipe 69 from freezing. In the present embodiment, the freeze prevention mechanism uses engine coolant of the diesel engine 11 that passes through the pipe 80. Specifically, the engine coolant immediately after cooling the diesel engine 11 reaches the second portion 80b through the first portion 80a of the pipe 80 while maintaining a relatively high temperature. The second portion 80 b is a part of the pipe 80 that contacts the outer surface of the urea water tank 200. The engine cooling water supplies heat to the urea water tank 200 and the urea water in the inside when flowing through the second portion 80b. Thereafter, the engine coolant supplies heat to the pipe 69 and urea water in the pipe 69 when flowing through the third portion 80 c of the pipe 80 installed adjacent to the pipe 69. Thereafter, the engine cooling water that has released heat and has reached a relatively low temperature passes through the fourth portion 80d of the pipe 80 and reaches the cooling unit 190A (a radiator or the like). In this manner, the freeze prevention mechanism supplies heat to the urea water tank 200 and the pipe 69 using the engine cooling water, and prevents the urea water tank 200 and the pipe 69 from freezing.

  Next, details of the urea water tank 200 will be described with reference to FIGS. 5-7 is a figure which shows an example of the specific structure of the urea water tank 200. FIG. FIG. 5 is a perspective view of the urea water tank 200 as viewed from the upper right and obliquely forward, and FIG. 6 is an exploded perspective view of the urea water tank 200 with the filler 230 removed, as viewed from the upper left and obliquely forward. 7 is a perspective view of the urea water tank 200 as viewed obliquely from the lower left front.

  In the following description, the front side (the arrow X2 direction side in the figure) close to the worker side during the urea water replenishment operation of the urea water tank 200 is the front, and the back side (arrow X1 direction side in the figure) is the rear. . In addition, the direction indicated by the arrow Y1 in the figure orthogonal to the front-rear direction is the left, and the direction indicated by the arrow Y2 is the right.

  The urea water tank 200 is made of resin and has a tank body 200a having a substantially rectangular cross section and a substantially box shape as a whole. An inclined surface 200b is formed in the upper front portion of the tank body 200a. The inclined surface 200b is inclined so as to approach the rear side as it goes upward.

  The inclined surface 200b is provided with a liquid supply port 200d (see FIG. 6). A filler 230 is detachably attached to the liquid supply port 200d. The urea water is supplied into the tank body 200a from the liquid supply port 200d through the filler 230 at the time of supply.

  Further, a level gauge 228 is provided on the inclined surface 200b. The level gauge 228 displays the level (liquid level height) of urea water in the tank body 200a. The operator can prevent the urea water from overflowing by replenishing the urea water while looking at the level gauge 228 during the urea water replenishment process.

  A concave portion 200c is formed on the right side of the inclined surface 200b. The concave portion 200c functions as a grip portion (handle) when the urea water tank 200 is attached to and detached from the tank reinforcing member 215.

  A drain plug 211 is provided at the bottom of the urea water tank 200 (see FIG. 7). The drain plug 211 is a plug that is removed when the urea water remaining in the urea water tank 200 is drained.

  A filler 230 is attached to the urea water tank 200. The filler 230 guides urea water to the liquid supply port 200d of the urea water tank 200 during replenishment. The filler 230 includes a filler body 230a, a filler tube 233, a filler cap 235, and the like.

  The filler body 230a is a cylindrical member, and is formed of metal or other material (for example, resin). The filler main body 230a is attached to the filler bracket 231 by welding or adhesion. Specifically, the cylindrical filler main body 230 a is fixed to the filler bracket 231 at a substantially central position. Therefore, in a fixed state, one end of the filler body 230a protrudes outside the filler bracket 231 to form an outer protrusion, and the other end protrudes inward to form an inner protrusion.

  A screw is formed on the outer periphery of the outer protrusion of the filler body 230a. The filler cap 235 is detachably attached to the outer protrusion of the filler body 230a.

  One end of a filler tube 233 is attached to the inner protrusion of the filler body 230a. The other end of the filler tube 233 is attached to the liquid supply port 200 d of the urea water tank 200.

  Thus, the filler 230 is attached to the urea water tank 200 using the filler bracket 231. The filler bracket 231 is a plate-like member and is formed of metal or other material (for example, resin).

  Further, the urea water tank 200 is formed with an upper attachment portion 200e and a lower attachment portion 200f. The upper mounting portion 200e is formed on the upper surface portion of the tank body 200a. The lower attachment portion 200f is formed below the liquid supply port 200d on the inclined surface 200b.

  A screw hole 200h is formed in the upper attachment portion 200e and the lower attachment portion 200f. The position of each screw hole 200h is configured to correspond to the position of the filler mounting bolt 232 when the filler bracket 231 is attached to the urea water tank 200.

  The filler bracket 231 is fixed to the urea water tank 200 by screwing the filler mounting bolts 232 into the screw holes 200h of the mounting portions 200e and 200f, whereby the filler 230 is also attached to the urea water tank 200.

  The urea water is replenished in a state where the filler 230 is attached to the urea water tank 200. In order to replenish urea water, the filler cap 235 is removed from the filler main body 230a, and urea water is injected from the outer end of the filler main body 230a. Thereby, urea water is replenished to the urea water tank 200 through the filler tube 233.

  The resin-made urea water tank 200 configured as described above is stored in the tank storage container 212. The tank storage container 212 includes a tank reinforcing member 215 and a tank bracket 226.

  As shown in FIGS. 5 to 7, the tank reinforcing member 215 includes a side reinforcing plate 215 </ b> A, an upper reinforcing plate 215 </ b> B, a tank mounting plate 215 </ b> C, and the like. The side reinforcing plate 215A, the upper reinforcing plate 215B, and the tank mounting plate 215C are formed of, for example, a metal material such as iron or another material (a material having higher strength than the material of the urea water tank 200).

  The side reinforcing plate 215A extends in the vertical direction (Z1 and Z2 directions in the figure) and has an L shape in plan view. The side reinforcing plates 215 </ b> A are disposed at positions facing the four corners of the urea water tank 200 and hold the four corner positions of the urea water tank 200.

  The upper reinforcing plate 215B connects the upper portions of the adjacent side reinforcing plates 215A. Thereby, the upper part of the side reinforcing plate 215A is fixed by the upper reinforcing plate 215B.

  The tank mounting plate 215C is a base on which the urea water tank 200 is mounted. Further, the lower end of the side reinforcing plate 215A is fixed to the tank mounting plate 215C.

  A plug opening 215E is formed in the tank mounting plate 215C. When the urea water tank 200 is attached to the tank reinforcing member 215, the drain plug 211 is inserted into the plug opening 215E and protrudes downward from the lower surface of the tank mounting plate 215C.

  A lower reinforcing plate 215D is disposed on the lower surface of the tank mounting plate 215C. The lower reinforcing plate 215D is provided so as to extend in the longitudinal direction of the tank mounting plate 215C (in the directions of arrows Y1 and Y2 in FIG. 5). The lower reinforcing plate 215D is fixed to a fixed member (a protective cover 240 to be described later) of the upper swing body 3 by using a fixing bolt 215Db, whereby the tank reinforcing member 215 is attached to the upper swing body 3 (the protective cover 240). Fixed.

  The plates 215 </ b> A to 215 </ b> D constituting the tank reinforcing member 215 can be joined using, for example, welding.

  The tank bracket 226 is attached to the upper part of the urea water tank 200 attached to the tank reinforcing member 215. The tank bracket 226 is fixed to the tank reinforcing member 215 using a tank fixing bolt 227.

  Specifically, a bolt fastening block 227a is attached to the side reinforcing plate 215A and the upper reinforcing plate 215B located on the front side by welding or the like. The bolt fastening block 227a is formed with a screw hole that engages with the tank fixing bolt 227. Further, the front end portion of the tank bracket 226 is provided with a hook-shaped portion 226d having an insertion hole (not shown in the figure) through which the tank fixing bolt 227 is inserted.

  Therefore, the tank bracket 226 is fixed to the tank reinforcing member 215 by inserting the tank fixing bolt 227 through the insertion hole formed in the bowl-shaped portion 226d and fastening it to the bolt fastening block 227a. In this way, the urea water tank 200 is stored in the tank storage container 212 with the tank bracket 226 fixed to the tank reinforcing member 215.

  The tank bracket 226 includes an upper portion 226 a extending in the horizontal direction and an inclined surface 226 b along the inclined surface 200 b of the urea water tank 200. The inclined surface 226b is held by pressing the inclined surface 200b of the urea water tank 200 from above in a state where the urea water tank 200 is stored in the tank storage container 212.

  Therefore, the urea water tank 200 is held in a state of being accommodated in the tank reinforcing member 215 by the tank bracket 226 even if it is not fixed to the tank reinforcing member 215 using bolts or the like. In this way, the urea water tank 200 is securely held and reinforced by the tank storage container 212 (tank reinforcing member 215, tank bracket 226).

  Next, the arrangement of the electric drive components (inverter 18, buck-boost converter 100, capacitor 19) and urea water tank 200 in the excavator according to the present embodiment will be described.

  8 and 9 are schematic plan views of the upper swing body 3 showing a first example of the arrangement of the electric drive components (inverter 18, step-up / down converter 100, capacitor 19) and urea water tank 200 according to the present embodiment. It is a right side view. FIG. 10 is a perspective view of the right front portion of the upper swing body 3 according to the excavator shown in FIGS. 8 and 9.

  As shown in FIG. 8, a diesel engine 11 is disposed in the center of the rear part of the upper swing body 3. A speed reducer 13 located on the right side of the diesel engine 11 is connected so as to be able to transmit power, and a motor generator 12 is connected to the opposite side (right side) of the speed reducer 13 to which the diesel engine 11 is connected. Connected to allow power transmission. That is, the diesel engine 11, the speed reducer 13, and the motor generator 12 are disposed as a unit from the rear center of the upper swing body 3 to the right rear part.

  An exhaust gas processing device 150 is disposed on the motor generator 12 and the speed reducer 13. The exhaust gas processing device 150 and the diesel engine 11 (turbocharger 61) are connected by an exhaust pipe 62.

  A cooling unit 190 is disposed at the left rear portion of the upper swing body 3 (left side of the diesel engine 11). The cooling unit 190 includes a cooling unit 190B including a radiator for the diesel engine 11 and the intercooler 65, and a cooling unit 190B including the motor generator 12, the turning electric motor 21, and a radiator for electric drive parts.

  A cabin 10 is disposed on the left front portion of the upper swing body 3.

  A boom support frame 180 that supports the boom 4 is firmly attached to the front center of the upper swing body 3 (to the right of the cabin 10). The boom 4 is supported by the boom pin 4p passing through the right frame 180R, the boom 4, and the left frame 180L while being sandwiched between the right frame 180R and the left frame 180L of the boom support frame 180.

  A turning electric motor 21 is disposed near the center of the upper swing body 3, that is, near the center of the upper swing body 3.

  A fuel tank 160 is provided at the center on the right side of the upper swing body 3 (the front side of the speed reducer 13, the motor generator 12, and the exhaust gas processing device 150). The fuel (light oil) of the diesel engine 11 stored in the fuel tank 160 is supplied to the diesel engine 11 via a fuel pipe (not shown).

  A hydraulic oil tank 170 that stores hydraulic oil used in the hydraulic drive system of the excavator is disposed at the left central portion of the upper swing body 3 (behind the cabin 10).

  The electric drive component and the urea water tank 200 are disposed at the right front portion of the upper swing body 3 (to the right of the boom support frame 180 held in front of the fuel tank 160 disposed at the right center portion and at the front center). The

  As shown in FIG. 9, the capacitor 19 is fixed on the revolving frame 3 a via a support portion 19 </ b> M including a damping rubber and the like, adjacent to the front of the fuel tank 160. Specifically, the capacitor 19 having a substantially rectangular parallelepiped outer shape has flat mounting feet 19a extending forward or rearward at the four corners, and the mounting feet 19a are connected to the revolving frame 3a via the support portion 19M. Fixed on top.

  A protective cover 240 having an upper surface 243 fixed to the revolving frame 3 a and raised (separated) from the upper surface of the revolving frame 3 a is provided on the capacitor 19. The inverter 18 and the step-up / down converter 100 are fixed side by side on the upper surface 243 of the protective cover 240 so as to be placed on the capacitor 19.

  On the upper surface 243 of the protective cover 240, the inverter 18 is disposed adjacent to the front of the fuel tank 160, and the buck-boost converter 100 is disposed adjacent to the front of the inverter 18. The inverter 18 and the step-up / down converter 100 are respectively fixed to the upper surface 243 of the protective cover 240 via a support portion 18M including a vibration damping rubber and the support portion 100M. More specifically, the inverter 18 and the step-up / step-down converter 100 are arranged and fixed side by side in the front-rear direction in such a manner that the respective longitudinal directions are in the left-right direction in plan view.

  Note that the arrangement order of the inverter 18 and the step-up / down converter 100 in the front-rear direction may be reversed.

  As shown in FIGS. 8 and 9, the urea water tank 200 is disposed and fixed on the turning frame 3 a adjacent to the front of the capacitor 19.

  As shown in FIG. 8, the urea water tank 200 is disposed near the left side in the right front part of the upper swing body 3. That is, the urea water tank 200 is arranged so that a distance D1 in the left-right direction from the right end in the right front portion of the upper swing body 3 exists to some extent (in such a mode that the distance D1 exists more than a predetermined value Dth1).

  The predetermined value Dth1 is, for example, a value obtained by adding a margin (such as a space for laying an exterior cover 260, which will be described later) to a width that allows a person of an assumed physique to pass.

  As shown in FIG. 9, the electric drive components are arranged in a stepped manner so that the height decreases toward the front, and are covered with an exterior cover 260. In other words, the inverter 18, the step-up / down converter 100, and the capacitor 19 are arranged in a manner of being stacked in a step-down manner, and are covered with the exterior cover 260. Specifically, the upper end positions of the inverter 18 and the step-up / step-down converter 100 arranged adjacent to the front of the fuel tank 160 and superimposed on the capacitor 19 are the highest, and the capacitor ahead of the inverter 18 and the step-up / down converter 100 is located. 19 (protective cover 240 for protecting) is at the lowest position. That is, the outer cover 260 (the outer cover 260 </ b> A (dotted line) corresponding to the section AA in FIG. 8) in the right side of the urea water tank 200 in the right front part of the upper swing body 3 is located in front of the capacitor 19. The first stage step 261 corresponding to the part covering the upper part of the unit and the second stage step 262 corresponding to the part covering the upper part of the inverter 18 and the buck-boost converter 100 are provided. As a result, from the front end step 3b provided at the front end of the swivel frame 3a, the upper portion of the upper swing body 3 (the uppermost surface 263 of the outer cover 260) is utilized by using the first step 261 and the second step 262 in the outer cover 260A. The engine room can be maintained. That is, the outer cover 260 </ b> A functions as a lifting step because it is formed in a step-down shape along the arrangement of the inverter 18, the buck-boost converter 100, and the capacitor 19.

  As shown in FIG. 9, the first step 261 in the exterior cover 260 </ b> A covers not only the capacitor 19 but also the upper part of a storage box 250 (described later) disposed adjacent to the front of the capacitor 19. Provided. Further, as shown in FIG. 9, a handrail 270 is provided at the right end of the exterior cover 260A that functions as a lifting step. The handrail 270 includes, for example, a support part 270a fixed to the first step 261, a support part 270b fixed to the uppermost surface 263, and a grip part 270c connecting between the support parts 270a and 270b. Thereby, the worker or the like can ascend to the upper part of the upper swing body 3 (the uppermost surface 263 of the exterior cover 260) while holding the handrail 270 (grip part 270c).

  On the other hand, as shown in FIG. 9, the exterior cover 260 (the exterior cover corresponding to the BB cross section in FIG. 8) is included in the left-right direction range in which the urea water tank 200 is disposed in the right front portion of the upper swing body 3. 260B (one-dot chain line)) is provided in such a manner that a horizontal plane covering the upper side of the urea water tank 200 extends over the entire front-rear direction.

  That is, as shown in FIG. 10, in the range on the right side of the urea tank 200 in the right front portion of the upper swing body 3, the outer cover 260 </ b> B covers the capacitor 19 and covers the urea water tank 200. A step-up / step-down step including a first-step step 261 having a low height and a second-step step 262 that covers the inverter 18 and the step-up / down converter 100 is formed. And the urea tank 200 is arrange | positioned and removed from the raising / lowering path | route of this raising / lowering step.

  For example, like the excavator according to the comparative example shown in FIGS. 11 to 13, the urea water tank 200 is disposed near the center in the left-right direction at the right front portion of the upper swing body 3, and the upper swing body 3 is An elevating step is provided. In this case, as shown in FIGS. 12 and 13, the height tends to be relatively high from the viewpoint of securing the capacity of the urea water tank 200, and the upper end of the urea water tank 200 is set on the front end step 3 b. It is difficult to climb up to the step surface 265 that covers the surface. Therefore, an intermediate step 3d is provided in the vicinity of the middle of the front end portion of the urea water tank 200 in the height direction, and the step surface 265 that covers the upper side of the urea water tank 200 after passing through the intermediate step 3d from the front end step 3b. It is necessary to form an ascending / descending step. Therefore, in the structure of such a raising / lowering step, it may become difficult to ascend to the upper swing body 3 through the intermediate step 3d having a narrow front-rear width. Further, the added intermediate step 3d may deteriorate the right front view seen from the cabin 10.

  On the other hand, in the excavator according to the present example (see FIGS. 8 to 10), as described above, the electric drive component is within the right side of the urea water tank 200 in the right front part of the upper swing body 3. It arrange | positions in the aspect laminated | stacked on the front-lowering step shape. In the range on the right side of the urea water tank 200 in the right front part of the upper swing body 3, a front lowering / lowering step is provided along the arrangement of the electric drive parts. The first step 261 corresponding to the upper portion can be set to be lower than the outer cover 260 </ b> B that covers the upper portion of the urea water tank 200. Therefore, as shown in FIG. 10, the elevating step (first stage step 261, first stage step 261, first stage 261) set in the right range of the urea water tank 200 in the right front portion of the upper swing body 3 without providing the intermediate step 3 d. The two-step step 262) can be used to easily ascend to the upper part of the upper swing body 3. Further, since it is not necessary to provide the intermediate step 3d, it is possible to ensure a good field of view in the right front as viewed from the cabin 10.

  In the excavator according to the present example (see FIGS. 8 to 10), the urea water tank 200 is disposed near the left side (inside the shovel) at the right front portion of the upper swing body 3. It may be arranged close to (the outside of the excavator). In the case of such a modification, an elevating step (exterior cover 260) having an elevating path passing through the left side of the urea water tank 200 can be provided on the right front portion of the upper swing body 3 contrary to this example. Further, in such a case, the handrail 270 is provided at the left end (left end) opposite to the right side where the urea water tank 200 is disposed near the right front portion of the upper swing body 3.

  As shown in FIG. 8, the inverter 18 drives the motor generator 12 and the turning electric motor 21 using electric power supplied from the capacitor 19 via the step-up / down converter 100. Therefore, the inverter 18 is connected to the motor generator 12 and the turning electric motor 21 via the wire harness 31 and the wire harness 32, respectively. An outlet of the wire harness 31, 32 in the inverter 18 (connector connector of the wire harness 31, 32) is on the side surface at the left end in the longitudinal direction in the plan view of the inverter 18 (hereinafter simply referred to as “longitudinal direction of the inverter 18”). Provided.

  In addition, the inverter 18 has the connection connector connected with the end of the wire harness (not shown) between the buck-boost converters 100 on the side surface of the left end of a longitudinal direction similarly to the connection connector connected with the wire harnesses 31 and 32. . Further, in the buck-boost converter 100, the connecting connector connected to the other end of the wire harness is referred to as the left side, that is, the longitudinal direction in the plan view of the buck-boost converter 100 (hereinafter simply referred to as “longitudinal direction of the buck-boost converter 100”). ) On the left side surface. Further, the step-up / down converter 100 has a connection connector connected to one end of a wire harness (not shown) between the capacitor 19 and the capacitor 19 on the side surface at the left end in the longitudinal direction. Further, the capacitor 19 has a connection connector connected to the other end of the wire harness on the front side surface or the left side surface.

  As shown in FIG. 8, the wire harness 31 extending leftward from the inverter 18 is bent backward to avoid interference with the boom support frame 180 (right frame 180R), and the urea water tank 200 and the fuel tank 160 are bent. On the left side of the, it is routed in a manner that runs vertically from front to back. The wire harness 31 is bent rightward behind the rear end of the fuel tank 160 and connected to the motor generator 12 disposed at the right rear portion of the upper swing body 3.

  Further, the wire harness 32 extending to the left from the inverter 18 is bent rearward like the wire harness 31 and extends from the front to the rear between the urea water tank 200 and the fuel tank 160 and the right frame 180R. It is arranged in a manner to do. The wire harness 32 is bent leftward behind the rear end of the right frame 180R and is connected to the turning electric motor 21 disposed near the center of the upper turning body 3.

  Cooling water is supplied to the electric drive component from a radiator included in the cooling unit 190B. Such cooling water circulates through the inverter 18, the step-up / down converter 100, and a water jacket provided in the capacitor 19. Thereby, the inverter 18, the buck-boost converter 100, and the capacitor 19 can be cooled (water cooled). As shown in FIG. 8, a cooling water hose 191 for supplying cooling water is connected between the cooling unit 190 and an electric drive component (for example, the inverter 18).

  The inverter 18 has a connection portion with the cooling water hose 191 on the side surface at the left end in the longitudinal direction, similarly to the connection connectors of the wire harnesses 31 and 32. The cooling water hose 191 extending to the left from the inverter 18 is bent backward to avoid interference with the boom support frame 180 (right frame 180R), like the wire harnesses 31 and 32, and the urea water tank 200 and the fuel On the left side of the tank 160, it is routed in such a manner that it runs vertically from front to back. Then, the cooling water hose 191 is bent in the left direction in front of the diesel engine 11 and routed so as to cross from the right to the left, and is connected to the cooling unit 190B.

  Although omitted in FIG. 8, a cooling water hose for returning the cooling water that has cooled the electric drive parts to the cooling unit 190B is also provided. For example, when the cooling water introduced from the inverter 18 is circulated in the order of the inverter 18, the buck-boost converter 100, and the capacitor 19, the return cooling water hose connects between the cooling unit 190 B and the capacitor 19. To do.

  As shown in FIG. 8, the pipe 69 extending from the urea water tank 200 is routed in a manner that runs vertically from the front to the rear on the left side of the urea water tank 200 and the fuel tank 160, as with the wire harness 31. The exhaust gas treatment device 150 is connected to the right rear portion of the upper swing body 3.

  The wire harnesses 31 and 32 are preferably routed so as to be positioned above the pipe 69 and the cooling water hose 191 in a portion adjacent to the pipe 69 and the cooling water hose 191. Thereby, even if urea water or cooling water leaks from the pipe 69 or the cooling water hose 191, it is possible to prevent urea water or cooling water from being applied to the wire harnesses 31 and 32.

  As shown in FIGS. 8 and 9, for example, an automatic greasing device or tool including a grease pail can, an electric pump, and a grease gun is accommodated in front of the capacitor 19 and adjacent to the right side of the urea water tank 200. A storage box 250 is provided. The upper end position of the storage box 250 is set according to the upper end position (height of the upper surface 243) of the protective cover 240 that covers the capacitor 19. In other words, the upper end position of the storage box 250 is provided so as to be substantially the same as the upper end position (height of the upper surface 243) of the protective cover 240 that covers the capacitor 19 disposed at the rear. The storage box 250 has a drain hole (not shown) for discharging water that has entered inside to the outside at the lower end. Thereby, it is possible to prevent the stored items inside from being submerged.

  14 and 15 are schematic views of the upper-part turning body 3 showing a second example of the arrangement of the electric drive parts (inverter 18, step-up / down converter 100, capacitor 19) and urea water tank 200 according to the present embodiment. FIG. 2 is a plan view and a right side view. FIG. 16 is a perspective view of the right front portion of the upper swing body 3 according to the excavator shown in FIGS. 14 and 15.

  In the description of this example, a description of a configuration in which the same arrangement as that of the first example described above is omitted, and a description will be given focusing on portions different from the first example.

  Similar to the first example, the electric drive component and the urea water tank 200 are provided on the right front portion of the upper swing body 3 (the front side of the fuel tank 160 disposed at the right center portion and the boom support frame 180 firmly held at the front center. (Right).

  As shown in FIGS. 14 and 15, the capacitor 19 is fixed on the turning frame 3 a adjacent to the front of the fuel tank 160 as in the first example.

  Similar to the first example, a protective cover 240 having an upper surface 243 fixed to the revolving frame 3 a and raised (separated) from the upper surface of the revolving frame 3 a is provided on the capacitor 19. Unlike the first example, in addition to the inverter 18 and the step-up / down converter 100, the urea water tank 200 is arranged side by side and fixed on the upper surface 243 of the protective cover 240 so as to overlap the capacitor 19. Yes.

  On the upper surface 243 of the protective cover 240, the inverter 18, the step-up / down converter 100, and the fuel tank 160 are arranged side by side adjacent to the front, and the urea water tank 200 is adjacent to the front of the inverter 18 and the step-up / down converter 100. Be placed.

  Similarly to the first example, the inverter 18 and the step-up / down converter 100 are fixed to the upper surface 243 of the protective cover 240 side by side in such a manner that the respective longitudinal directions in plan view are directed in the left-right direction.

  As shown in FIG. 15, the protective cover 240 (the upper surface 243 thereof) extends further forward than the front and rear positions of the front end of the capacitor 19, and the portion of the protective cover 240 (the upper surface 243 thereof) includes urea. A water tank 200 is arranged. Further, a drain hole 241 is provided at a location where the urea water tank 200 is disposed in the protective cover 240, and the drain plug 211 is exposed from the back side of the protective cover 240. Thus, a work space 244 between the protective cover 240 and the swivel frame 3 a is provided below the urea water tank 200, and an operator accesses the drain plug 211 using the work space 244 and the drain hole 241. can do. In addition, when the work space 244 is provided, a wire harness (not shown) or a cooling water hose (not shown) is connected to the side surface of the front end of the capacitor 19. It can be used effectively as a space.

  As described above, the urea water tank 200 can be disposed further rearward by disposing the urea water tank 200 on the upper surface 243 of the protective cover 240 that covers the upper side of the capacitor 19. The front and rear length of the part can be shortened. Accordingly, it is possible to make it difficult for the upper-part turning body 3 to come into contact with surrounding obstacles at the time of turning, and it is possible to secure a wider right front view as viewed from the operator of the cabin 10.

  Further, as shown in FIG. 14, the urea water tank 200 is arranged near the left side in the right front part of the upper swing body 3 as in the first example. That is, the urea water tank 200 is arranged so that there is a certain distance D1 in the left-right direction from the right end at the right front portion of the upper swing body 3 (in a mode in which the distance D1 is greater than or equal to the predetermined value Dth1).

  As shown in FIGS. 14 and 15, a storage box 250 is provided between the fuel tank 160 and the urea water tank 200 above the inverter 18 and the buck-boost converter 100. The upper end position of the storage box 250 is set in accordance with the upper end position of the exterior cover 260 that covers the urea water tank 200. That is, the upper end position of the storage box 250 is provided so as to be substantially the same as the upper end position of the urea water tank 200 disposed in front. Similar to the first example, the storage box 250 has a drain hole (not shown) for discharging water that has entered inside to the outside at the lower end. Thereby, it is possible to prevent the stored items inside from being submerged. The drain hole is connected to a drain pipe (not shown), and the drain pipe allows water to be supplied to the electric drive components (inverter 18, step-up / down converter 100, and capacitor 19), the wire harnesses 31, 32, and the like. Discharge water in such a way that it does not take.

  In addition, for example, a holding member having four legs fixed to the revolving frame 3a and a shelf that is supported on the upper ends of the legs and located above the inverter 18 and the step-up / down converter 100 is provided. 250 is fixed to the upper surface of the shelf of the holding member. In addition, as shown in FIG. 15, the storage box 250 is arranged in a wrapping position at the front and rear positions where the boom pins 4p are provided, but since the assembly work is performed after the boom pins 4p are attached, the boom 4 is at the final stage of the mass production process. When assembling, there will be no disturbing situation.

  As shown in FIG. 15, like the first example, the electric drive parts are arranged in a stepped manner so that the height decreases toward the front, and are covered with an exterior cover 260. That is, the inverter 18, the step-up / down converter 100, and the capacitor 19 are arranged in a manner of being stacked in a step-down manner that is forwardly lowered, and are covered with the exterior cover 260. Specifically, the upper end positions of the inverter 18 and the step-up / step-down converter 100 arranged on the capacitor 19 are the highest, and the upper end position of the capacitor 19 ahead of the inverter 18 and the step-up / down converter 100 is the lowest. That is, in the range on the right side of the urea water tank 200 in the right front portion of the upper swing body 3, the exterior cover 260 (the exterior cover 260 A (dotted line) corresponding to the section AA in FIG. 10) is located in front of the capacitor 19. The first stage step 261 corresponding to the part covering the upper part of the section and the work space 244 and the second stage step 262 corresponding to the part covering the upper part of the inverter 18 and the buck-boost converter 100 are provided. Thereby, from the front end step 3b provided at the front end of the revolving frame 3a, the upper portion of the upper revolving body 3 (the uppermost surface 263 of the outer cover 260) is utilized using the first step 261 and the second step 262 of the outer cover 260A. The engine room can be maintained. In other words, the exterior cover 260A is formed in a step-down shape along the arrangement of the inverter 18, the step-up / step-down converter 100, and the capacitor 19, and thus functions as a step for raising and lowering as in the first example.

  As shown in FIG. 15, a handrail 270 is provided at the right end portion of the exterior cover 260A that functions as an elevating step, as in the first example. Thereby, the worker or the like can ascend to the upper part of the upper swing body 3 (the uppermost surface 263 of the exterior cover 260) while holding the handrail 270 (grip part 270c).

  On the other hand, as shown in FIG. 15, the outer cover 260 (the outer cover corresponding to the BB cross section of FIG. 10) in the left-right direction range in which the urea water tank 200 is disposed in the right front portion of the upper swing body 3. 260B (one-dot chain line)) is provided in such a manner that a horizontal plane covering the upper side of the urea water tank 200 extends over the entire front-rear direction.

  That is, as shown in FIG. 16, in the range on the right side of the urea tank 200 in the right front part of the upper swing body 3, the outer cover 260 </ b> B covers the upper side of the capacitor 19 and covers the upper side of the urea water tank 200. A step-up / step-down step including a first-step step 261 having a low height and a second-step step 262 that covers the inverter 18 and the step-up / down converter 100 is formed. And the urea tank 200 is arrange | positioned and removed from the raising / lowering path | route of this raising / lowering step.

  As described above, when using the step surface that covers the upper part of the urea water tank 200 as an elevating path like the excavator according to the comparative example shown in FIGS. 11 to 13, it is necessary to provide the above-described intermediate step 3 d. In the configuration of the raising / lowering step, it may be difficult to ascend to the upper swing body 3. Further, the added intermediate step 3d may deteriorate the right front view seen from the cabin 10.

  On the other hand, in the shovel according to the present example (see FIGS. 14 to 16), as in the first example, the electric drive is performed in the range on the right side of the urea water tank 200 in the right front part of the upper swing body 3. The components are arranged in such a manner that the components are stacked in a step-down manner. In the range on the right side of the urea water tank 200 in the right front part of the upper swing body 3, a front lowering / lowering step is provided along the arrangement of the electric drive parts. The first step 261 corresponding to the upper portion can be set to be lower than the outer cover 260 </ b> B that covers the upper portion of the urea water tank 200. Therefore, as shown in FIG. 16, without the intermediate step 3d, the elevating step (the first step 261, the first step 261, which is set to the right range of the urea water tank 200 in the right front portion of the upper swing body 3 is provided. The two-step step 262) can be used to easily ascend to the upper part of the upper swing body 3. Further, since it is not necessary to provide the intermediate step 3d, it is possible to ensure a good field of view in the right front as viewed from the cabin 10.

  In this example, the storage box 250 is further stacked on the inverter 18 and the step-up / down converter 100, that is, the storage box is disposed between the inverter 18 and the step-up / down converter 100 and the second stage step 262. 250 is arranged. The storage box 250 is provided such that the upper end thereof is substantially the same as the upper end of the urea water tank 200. Therefore, as described above, the exterior cover 260B can be configured as a (flat) horizontal plane having no step over the entire range in the front-rear direction of the right front portion of the upper swing body 3. Further, the horizontal surface of the exterior cover 260B and the second step 262 of the exterior cover 260A can be flush with each other without providing a step. Therefore, by disposing the storage box 250 on the inverter 18 and the step-up / down converter 100, it is possible to improve the degree of sophistication in the design of the exterior cover 260 (260A, 260B) without providing a useless space. .

  In a situation where the excavator performs work using the boom 4, the arm 5, and the bucket 6 as attachments, a heavy object such as a rock may collide with the right front part of the upper swing body 3 from above. For example, in a situation where excavation of a slope having a large inclination adjacent to an excavator located on a substantially horizontal plane, excavation may be performed at a high position on the slope, and the bucket 6 is a heavy object such as a rock included in the soil of the slope. May be thrown off to the shovel side. Therefore, there is a possibility that the heavy object flipped off by the bucket 6 may collide with the right front part of the upper swing body 3 from above. In a situation where the arm 5 and the bucket 6 are fully closed, and the soil containing heavy objects such as excavated rocks is held in the bucket 6 and the upper revolving unit 3 is turned left in order to remove the soil, May spill to the right due to inertial force. For this reason, there is a possibility that heavy objects that have fallen from the bucket 6 collide with the right front portion of the upper swing body 3 from above. On the other hand, since the urea water tank 200 is disposed on the capacitor 19, heavy objects such as rocks flying from above due to the work of the excavator do not easily collide with the capacitor 19 directly. In addition, since the storage box 250 is placed above the electric drive parts (the inverter 18, the buck-boost converter 100, and the capacitor 19), heavy objects such as rocks flying from above due to the work of the excavator are present. It becomes difficult to directly collide with electric drive parts. Therefore, the protection performance (impact resistance) of the electric drive component can be improved.

  Further, since the storage box 250 is disposed above the inverter 18, the step-up / down converter 100, and the capacitor 19, a situation in which these electric drive parts are flooded by rainwater or the like that has entered the exterior cover 260. Can be suppressed. Specifically, most of rainwater or the like that has entered the exterior cover 260 is received in the storage box 250, and as described above, through the drain hole and drain pipe (both not shown), the inverter 18, the step-up / down converter 100, And it is discharged so as not to be applied to the capacitor 19. Therefore, the protection performance (water resistance) of the electric drive parts such as the inverter 18, the step-up / down converter 100, and the capacitor 19 can be improved.

  In this example, the urea water tank 200 is disposed near the left side (inside the shovel) at the right front part of the upper swing body 3, but the right side (excavator side) is the same as the above-described modified example of the first example. It may be arranged close to the outside. In the case of such a modified example, as in the modified example of the first example described above, an elevating step having an elevating path passing through the left side of the urea water tank 200 at the right front portion of the upper swing body 3 contrary to the present example ( An exterior cover 260) can be provided. Further, in such a case, the handrail 270 is provided at the left end (left end) opposite to the right side where the urea water tank 200 is disposed near the right front portion of the upper swing body 3.

  Next, FIGS. 17 and 18 are schematic views of the upper swing body 3 showing a third example of the arrangement of the electric drive components (the inverter 18, the step-up / down converter 100, and the capacitor 19) and the urea water tank 200 according to the present embodiment. It is a typical plan view and a right side view. FIG. 19 is a front cross-sectional view (CC cross-sectional view shown in FIG. 17) at the right front portion of the upper swing body 3 according to the shovel shown in FIGS. 17 and 18. FIG. 20 is a perspective view of the right front portion of the upper swing body 3 according to the shovel shown in FIGS. 17 and 18.

  In the description of this example, a description of a configuration in which the same arrangement as that of the first example and the second example described above is omitted, and a description will be given focusing on portions different from the first example and the second example.

  As shown in FIGS. 17-20, this example provides the side step 3c instead of the front end step 3b in the second example.

  The side step 3c is provided on the right side surface of the turning frame 3a that wraps in the front-rear direction with the first step 261 of the exterior cover 260A (lifting step). The side step 3c can be stationary in either of two states: a storage state (solid line) stored along the right side surface of the swivel frame 3a and a use state (dotted line) protruding from the right side surface of the swivel frame 3a. Thus, it is supported so as to be rotatable up and down around the axis X in the front-rear direction.

  As shown in FIG. 19, a ladder-like handrail 280 is provided between the side surface of the exterior cover 260 (the exterior cover 260 </ b> C corresponding to the CC cross section in FIG. 17) and the first step 261. Thereby, the worker or the like can ascend to the first step 261 while holding the handrail 280 from the side step 3c while fixing the side step 3c to the use state (dotted line state). Then, as in the second example, the first stage step 261 and the second stage step 262 are used to ascend to the upper part of the upper swing body 3 (the uppermost surface 263 of the exterior cover 260) and perform maintenance of the engine room. Can do.

  As described above, even if the side step 3c approaching from the right side is provided instead of the front end step 3b approaching from the front, the first step 261 and the second step 262 are used as in the second example. It can rise to the upper part of the revolving structure 3 (the uppermost surface 263 of the exterior cover 260).

  In addition, as described above, when the step surface that covers the urea water tank 200 is used as an elevating path like the excavator according to the comparative example illustrated in FIGS. 11 to 13, the intermediate step 3 d described above needs to be provided. In such a configuration of the elevating step, there is a possibility that it is difficult to ascend to the upper swing body 3. Further, the added intermediate step 3d may deteriorate the right front view seen from the cabin 10.

  On the other hand, in the shovel according to this example (see FIGS. 17 to 20), as in the first example and the second example, the range on the right side of the urea water tank 200 in the right front part of the upper swing body 3. Thus, the electric drive parts are arranged in such a manner that they are stacked in a step-down manner. In the range on the right side of the urea water tank 200 in the right front part of the upper swing body 3, a front lowering / lowering step is provided along the arrangement of the electric drive parts. The first step 261 corresponding to the upper portion can be set to be lower than the outer cover 260 </ b> B that covers the upper portion of the urea water tank 200. Therefore, as shown in FIG. 16, without the intermediate step 3d, the elevating step (the first step 261, the first step 261, which is set to the right range of the urea water tank 200 in the right front portion of the upper swing body 3 is provided. The two-step step 262) can be used to easily ascend to the upper part of the upper swing body 3. Further, since it is not necessary to provide the intermediate step 3d, it is possible to ensure a good field of view in the right front as viewed from the cabin 10.

  Further, since the front / rear length of the right front portion of the upper swing body 3 can be shortened by the amount corresponding to the front end step 3b, the upper swing body 3 can be made less likely to come into contact with surrounding obstacles when turning, and the cabin The field of view of the right front viewed from 10 operators can be secured more widely.

  Further, the side step 3c can be stored along the right side surface of the turning frame 3a. Therefore, the main body width of the excavator in the normal state is not increased more than necessary, and for example, occurrence of a situation in which the main body width becomes excessively large and cannot be transported on a trailer or the like can be suppressed.

  21 and 22 are schematic views of the upper-part turning body 3 showing a fourth example of the arrangement of the electric drive components (inverter 18, step-up / down converter 100, capacitor 19) and urea water tank 200 according to the present embodiment. FIG. 2 is a plan view and a right side view. FIG. 23 is a front cross-sectional view (CC cross-sectional view shown in FIG. 21) at the right front portion of the upper swing body 3 according to the shovel shown in FIGS. 21 and 22. FIG. 24 is a perspective view of the right front portion of the upper swing body 3 according to the shovel shown in FIGS. 21 and 22.

  In the description of this example, a description of a configuration in which the same arrangement as in the first to third examples described above is omitted, and a description will be given focusing on parts different from the first to third examples.

  As shown in FIGS. 21 to 23, the electric drive component and the urea water tank 200 are the same as in the first to third examples, in the right front portion of the upper swing body 3 (the fuel tank 160 disposed in the right center portion). It is arranged on the right side of the boom support frame 180 which is held forward and in the center of the front part.

  As shown in FIGS. 21 to 23, the capacitor 19 is arranged in the same manner as in the second and third examples. That is, the capacitor 19 is fixed to the turning frame 3a via the support portion 19M adjacent to the front of the fuel tank 160.

  Similar to the second and third examples, a protective cover having an upper surface 243 that is fixed to the revolving frame 3a and raised (separated) from the upper surface of the revolving frame 3a is provided on the capacitor 19. As in the second and third examples, the inverter 18, the step-up / down converter 100, and the urea water tank 200 are arranged on the upper surface 243 of the protective cover 240 so as to be arranged on the front and rear, so that they are placed on the capacitor 19. The That is, on the upper surface 243 of the protective cover 240, the inverter 18 and the buck-boost converter 100 are arranged side by side adjacent to the front of the fuel tank 160, and the urea water tank 200 is adjacent to the front of the inverter 18 and the buck-boost converter 100. Is placed.

  On the other hand, on the upper surface 243 of the protective cover 240, the arrangement of the inverter 18, the buck-boost converter 100, and the urea water tank 200 in the left-right direction is different from the second example and the third example.

  As shown in FIGS. 21 and 23, the inverter 18 and the buck-boost converter 100 are arranged close to the left side in the right front part of the upper swing body 3. That is, the inverter 18 and the step-up / down converter 100 are arranged such that a distance D2 in the left-right direction from the right end at the right front portion of the upper swing body 3 exists to some extent (in a manner in which the distance D2 is greater than or equal to a predetermined value Dth2). .

  The predetermined value Dth2 is, for example, a value obtained by adding a margin (such as a space for laying the exterior cover 260) to the size of a foot wearing human shoes of an assumed physique.

  Further, as shown in FIGS. 21 and 23, unlike the second and third examples, the urea water tank 200 is not arranged close to the left side, and is near the center in the left-right direction at the right front portion of the upper swing body 3. Placed in.

  As shown in FIGS. 21 to 23, a storage box 250 is provided between the fuel tank 160 and the urea water tank 200 above the inverter 18 and the step-up / down converter 100 as in the second and third examples. As shown in FIGS. 15 and 17, unlike the second and third examples, the storage box 250 is not an aspect that exists over the entire left and right direction at the right front portion of the upper swing body 3, but the inverter 18 and the step-up / down pressure. It is provided in such a manner that it exists only in a portion corresponding to the range in the left-right direction in which converter 100 is arranged. That is, the storage box 250 is arranged so that there is a certain distance from the right end in the right front portion of the upper swing body 3, similar to the inverter 18 and the step-up / down converter 100.

  As shown in FIG. 23, the electric drive components are arranged in a stepped manner so that the height decreases toward the right, and are covered with an exterior cover 260. In other words, the inverter 18, the step-up / step-down converter 100, and the capacitor 19 are arranged in a manner of being stacked in a step-down direction that falls to the right, and are covered with the outer cover 260 (the outer cover 260C corresponding to the CC cross section in FIG. 21). ing. Specifically, the upper end positions of the inverter 18 and the buck-boost converter 100 that are arranged on the capacitor 19 are the highest, and the upper end position of the capacitor 19 on the right side of the inverter 18 and the buck-boost converter 100 is the lowest. . That is, in the range on the rear side of the urea water tank 200 in the right front portion of the upper swing body 3, the exterior cover 260 (260 </ b> C) includes the first stage step 261 corresponding to the portion covering the upper side of the capacitor 19, and the inverter 18 and a second stage step 262 corresponding to the portion covering the up-down converter 100. Thereby, from the side surface step 3c provided on the right side surface of the swivel frame 3a, the upper portion of the upper revolving body 3 (the uppermost surface 263 of the outer cover 260) is utilized by using the first step 261 and the second step 262 of the outer cover 260C. The engine room can be maintained. That is, the outer cover 260 </ b> C functions as an elevating step because the outer cover 260 </ b> C is formed in a step-like shape that descends to the right along the arrangement of the inverter 18, the step-up / down converter 100, and the capacitor 19.

  As shown in FIGS. 21 to 24, as in the third example, the front end step 3b is not provided, but a side step 3c is provided instead. The side step 3c is provided on the right side surface of the turning frame 3a that wraps in the front-rear direction with the first step 261 and the second step of the exterior cover 260C (elevating step). As in the third example, the side step 3c is in any of two states: a storage state (solid line) stored along the right side surface of the revolving frame 3a and a use state (dotted line) protruding from the right side surface of the revolving frame 3a. It is supported so that it can be turned up and down around an axis X in the front-rear direction. Further, as shown in FIG. 23, a ladder-like handrail 280 is provided between the side surface of the exterior cover 260C functioning as an elevating step and the first step 261 as in the third example. Thereby, the worker or the like can ascend to the upper part of the upper swing body 3 (the uppermost surface 263 of the outer cover 260) while holding the handrail 280.

  On the other hand, as shown in FIG. 22, at the front and rear positions of the urea water tank 200 in the right front part of the upper swing body 3, the exterior cover 260 (in the AA cross section and the BB cross section in FIG. 21). Corresponding exterior cover 260A (dotted line) and exterior cover 260B (one-dot chain line)) are provided in such a manner that the horizontal plane covering the upper part of urea water tank 200 extends over the entire horizontal direction.

  That is, as shown in FIG. 24, the outer cover 260 </ b> B covers the upper side of the capacitor 19 and the upper side of the urea water tank 200 in the rear side of the urea tank 200 in the right front part of the upper swing body 3. A lower-right raising / lowering step including a first-stage step 261 having a low height and a second-stage step 262 that covers the inverter 18 and the step-up / down converter 100 is formed. And the urea tank 200 is arrange | positioned and removed from the raising / lowering path | route of this raising / lowering step.

  As described above, when using the step surface that covers the upper part of the urea water tank 200 as an elevating path like the excavator according to the comparative example shown in FIGS. 11 to 13, it is necessary to provide the above-described intermediate step 3 d. In the configuration of the raising / lowering step, it may be difficult to ascend to the upper swing body 3. Further, the added intermediate step 3d may deteriorate the right front view seen from the cabin 10.

  On the other hand, in the excavator according to the present example (see FIGS. 21 to 24), the electric drive component is lowered to the right in the range behind the urea water tank 200 in the right front portion of the upper swing body 3. It arrange | positions in the aspect laminated | stacked on step shape. Then, in the range on the rear side of the urea water tank 200 in the right front portion of the upper swing body 3, a front lowering / lowering step is provided along the arrangement of the electric drive parts, and the upper side of the capacitor 19 is The first step 261 corresponding to the covered portion can be set to be lower in height than the exterior cover 260B that covers the upper part of the urea water tank 200. Therefore, as shown in FIG. 24, without providing the intermediate step 3d, the elevating step (first stage step 261, set in the rear side range of the urea water tank 200 in the right front portion of the upper swing body 3 is provided. The second step 262) can be used to easily ascend to the upper part of the upper swing body 3. Further, since it is not necessary to provide the intermediate step 3d, it is possible to ensure a good field of view in the right front as viewed from the cabin 10.

  In this example, a storage box 250 is further stacked on the inverter 18 and the buck-boost converter 100, and the storage box 250 is provided so that the upper end thereof is substantially the same as the upper end of the urea water tank 200. ing. For this reason, the outer cover 260 has a level difference between the portion of the second step 262 corresponding to the upper surface of the storage box 250 and the portion corresponding to the portion covering the upper portion of the urea water tank 200 in front of the outer cover 260. ) It can be composed of a horizontal plane. Therefore, by disposing the storage box 250 on the inverter 18 and the step-up / down converter 100, the design level of the exterior cover 260 can be improved without providing a useless space.

  Further, as in the second and third examples, since the urea water tank 200 is arranged on the capacitor 19, heavy objects such as rocks flying from above due to the work of the excavator are directly applied to the capacitor 19. It becomes difficult to collide. In addition, as in the second and third examples, the storage box 250 is placed over the electric drive components (inverter 18, step-up / down converter 100, and capacitor 19), resulting in the work of the excavator. Heavy objects such as rocks flying from above do not easily collide with electric drive parts. Therefore, the protection performance (impact resistance) of the electric drive component can be improved.

  Similarly to the second and third examples, the storage box 250 is placed over the inverter 18, the buck-boost converter 100, and the capacitor 19, so that the inverter 18, the buck-boost converter 100, and the capacitor 19 are overlapped. It is possible to improve the protection performance (water resistance) of the electric drive parts such as the above.

  As mentioned above, although the form for implementing this invention was explained in full detail, this invention is not limited to this specific embodiment, In the range of the summary of this invention described in the claim, various Can be modified or changed.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 1A, 1B Hydraulic motor 2 Turning mechanism 3 Upper turning body 3a Turning frame 4 Boom 4p Boom pin 5 Arm 6 Bucket 7 Boom cylinder 8 Arm cylinder 9 Bucket cylinder 10 Cabin 11 Diesel engine 12 Motor generator (motor)
13 Reducer 14 Main pump 15 Pilot pump 16 High pressure hydraulic line 17 Control valve 18, 18A, 18B Inverter (electrically driven parts)
18M Supporting part 19 Capacitor (electrically driven parts)
19M support portion 21 electric motor for turning 22 resolver 23 mechanical brake 24 turning speed reducer 25 pilot line 26 operation device 26A, 26B lever 26C pedal 27, 28 hydraulic line 29 pressure sensor 30 controller 31 wire harness 32 wire harness 69 urea water supply piping 100 Buck-boost converter (electrically driven parts)
100M support section 150 exhaust gas processing device 160 fuel tank 170 hydraulic oil tank 180 boom support frame 180L left frame 180R right frame 190, 190A, 190B cooling unit 191 cooling water hose 200 urea water tank (storage tank)
211 Drain plug 240 Protective cover 241 Drain hole 243 Upper surface 244 Work space 250 Storage box 260 Exterior cover 260A, 260C Exterior cover (elevating step)
261 First step 262 Second step 263 Top surface 270,280 Handrail

Claims (8)

An upper swing body,
A cabin provided at a left front portion of the upper swing body,
A diesel engine mounted at the rear of the upper swing body,
An electric motor mounted on the rear of the upper rotating body adjacent to the diesel engine and assisting the diesel engine;
An electric drive component mounted on the right front of the upper swing body for driving the electric motor,
An exhaust gas treatment device for treating the exhaust gas of the diesel engine using a treatment agent;
A storage tank that is mounted on the right front of the upper swing body and stores the treatment agent;
Elevating step provided at the right front part of the upper swing body,
The electric drive parts are arranged in a manner of being stacked in a step-down manner of front-down or right-down,
The elevating step is formed in a front-down or right-down manner along the arrangement of the electric drive parts,
The storage tank is arranged off the lifting path of the lifting step.
Excavator. The electric drive parts are arranged in a manner of being stacked in a step-down manner that falls forward,
The storage tank is arranged near the left side or the right side in the right front part of the upper swing body,
The excavator according to claim 1. The electric drive component includes a power storage device,
Of the electric drive components stacked in a step-down direction, the power storage device is disposed in the lowest layer,
The ascending / descending step has a lowest first step that covers the upper side of the power storage device,
The shovel according to claim 2. The electric drive component includes a drive device that is driven by electric power supplied from the power storage device,
The drive device is arranged so as to overlap the power storage device in a mode in which the front end is behind the front end of the power storage device,
The ascending / descending step includes a first step that covers the upper portion of the power storage device in front of the front end of the driving device, and a second step that is positioned behind the first step and covers the upper portion of the driving device. Including,
The excavator according to claim 3. Of the left side and the right side in the right front part of the upper swivel body, a handrail is provided at the end opposite to the direction in which the storage tank is arranged in a front-lowering manner.
The excavator according to any one of claims 2 to 4. The electric drive parts are arranged in a manner of being stacked in a step-down manner that descends to the right,
The raising and lowering step is formed in a right-down manner along the arrangement of the electric drive parts,
The storage tank is disposed in front of the lifting path of the lifting step.
The excavator according to claim 1. The electric drive component includes a power storage device,
Among the electric drive components stacked in a step-down direction that falls to the right, the power storage device is disposed in the lowest layer,
The ascending / descending step has a lowest first step that covers the upper side of the power storage device,
The excavator according to claim 6. The electric drive component includes a drive device that is driven by electric power supplied from the power storage device,
The drive device is arranged so as to overlap the power storage device in a mode in which the right end is on the left side of the right end of the power storage device,
The ascending / descending step includes a first step covering the upper side of the power storage device to the right of the right end of the driving device, and a second step covering the upper side of the driving device, located to the left of the first step. Including steps,
The excavator according to claim 7.

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