JP2017014891A - Hybrid shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid shovel in which a fluid reducing agent tank for storing a treatment agent therein is efficiently arranged, the treatment agent being supplied to a gaseous emission treating device treating the gaseous emission of a diesel engine.SOLUTION: The hybrid shovel comprises a slewing upper structure, a cabin which is provided in a leftward front of the slewing upper structure, a diesel engine which is mounted in a rear of the slewing upper structure, an electric motor which is mounted adjacently to the diesel engine and in the rear of the slewing upper structure and assists the diesel engine, a power storage device which is mounted in the right front of the slewing upper structure, a drive device which is mounted adjacently to the power storage device and in the right front of the slewing upper structure and drives the electric motor by electric power supplied from the power storage device, a gaseous emission treating device which is mounted adjacently to the diesel engine and in the rear of the slewing upper structure and treats a gaseous emission of the diesel engine by using a treatment agent, and a storage tank which is mounted adjacently to the power storage device and to the drive device and in the right front of the slewing upper structure and stores the treatment agent.SELECTED DRAWING: Figure 9

Description

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

  Conventionally, a hybrid excavator is known that includes an electric motor (assist motor) that assists an engine, which is a driving force source of a hydraulic pump, and an electric motor (rotation motor) that drives an upper swing body to rotate.

  In addition to the configuration of the excavator that uses only the engine as a power source, the hybrid excavator includes, in addition to the above-described electric motor, an electric storage device that supplies electric power to the electric motor, and a driving device that drives the electric motor using electric power supplied from the electric storage device (For example, an inverter or a converter). Here, the hybrid excavator usually follows an excavator structure that uses only the engine as a power source, and in many cases, an electric motor, a power storage device, a drive device, and the like are added. It is necessary to secure a place for additionally mounting a drive device (hereinafter referred to as an electric drive component) in the upper swing body.

  In response to such a demand, for example, an electric drive component additionally mounted on the right front portion of the upper swing body (opposite side of the cabin at the front portion of the upper swing body) has been proposed (for example, Patent Document 1). reference).

  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).

Japanese Patent Application Laid-Open No. 2014-84643 JP 2013-160005 A

  However, when an exhaust gas treatment device is mounted on a hybrid excavator, it follows the structure of the excavator that uses only the engine as a power source, and in addition to the place where electric drive parts necessary for hybridization are mounted, further, an exhaust gas treatment It is necessary to secure a place in the upper revolving unit where an apparatus, particularly an accompanying relatively large volume liquid reducing agent tank is additionally mounted.

  Then, in view of the said subject, it aims at providing the hybrid shovel by which the liquid reducing agent tank which stores the processing agent supplied to the exhaust-gas processing apparatus which processes the exhaust gas of a diesel engine is arrange | positioned efficiently.

In order to achieve the above object, in one embodiment, a hybrid excavator comprises:
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;
A power storage device mounted on the right front of the upper swing body,
A drive device that is mounted on the right front portion of the upper swing body adjacent to the power storage device and drives the electric motor with electric power supplied from the power storage device;
An exhaust gas treatment device mounted on the rear part of the upper rotating body adjacent to the diesel engine and treating exhaust gas of the diesel engine using a treatment agent;
There is a storage tank that is mounted on the right front portion of the upper swing body adjacent to the power storage device and the drive device and stores the processing agent.

  According to the above-described embodiment, it is possible to provide a hybrid excavator in which a liquid reducing agent tank that stores a treatment agent supplied to an exhaust gas treatment device that treats exhaust gas of a diesel engine is efficiently arranged.

It is a side view of a hybrid excavator It is a figure which shows an example of a structure of the drive system of a hybrid shovel. It is a figure which shows an example of a structure of the electrical storage system of a hybrid shovel. 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 turning body which shows arrangement | positioning of the electric drive component which concerns on a comparative example, and a urea water tank. It is a top view of the upper turning body which shows the 1st example of arrangement | positioning of the electric drive component and urea water tank which concern on this embodiment. It is a right view of the upper turning body which shows the 1st example of arrangement | positioning of the electric drive components and urea water tank which concern on this embodiment. It is a top view of the upper turning body which shows the 2nd example of arrangement | positioning of the electric drive components and urea water tank which concern 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 which concern on this embodiment. It is a top view of the upper revolving structure which shows the 3rd 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 3rd example of arrangement | positioning of the electric drive components and urea water tank which concern on this embodiment. 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 a top view of the upper turning body which shows the 5th example of arrangement | positioning of the electric drive component and urea water tank which concerns on this embodiment. It is a right view of the upper turning body which shows the 5th example of arrangement | positioning of the electric drive component which concerns on this embodiment, and a urea water tank. It is a figure which shows an example of a structure of a cooling system. It is a bottom view of the portion in which the urea water tank of the upper swing body is mounted.

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

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

  FIG. 1 is a side view showing a hybrid 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 a hybrid 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. 9 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 drive system of the hybrid excavator. 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 hybrid excavator according to this 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 hybrid excavator 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 hybrid excavator. 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. 9 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”).

  A urea water supply pump 70 is provided in the urea water supply pipe 69. 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 treatment device 150 has a freeze prevention mechanism that prevents the urea water tank 200 and the urea water supply 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 cooling water supplies heat to the urea water supply pipe 69 and the urea water in the urea water supply pipe 69 when flowing through the third portion 80 c of the pipe 80 installed adjacent to the urea water supply 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 urea water supply pipe 69 using the engine cooling water, and prevents the urea water tank 200 and the urea water supply 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 the revolving frame 2a using the fixing bolt 215Db, and thereby the tank reinforcing member 215 is fixed to the revolving frame 2a.

  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, step-up / down converter 100, capacitor 19) and urea water tank 200 in the hybrid excavator according to this embodiment will be described.

  First, with reference to FIG. 8, the arrangement | positioning of the electric drive components and urea water tank in the hybrid shovel which concerns on a comparative example is demonstrated.

  FIG. 8 is a schematic plan view of an upper swing body 3C showing an arrangement of electric drive components (inverter 18C, step-up / down converter 100C, capacitor 19C) and urea water tank 200C in a hybrid excavator according to a comparative example.

  The components other than the electric drive parts (inverter 18C, step-up / down converter 100C, capacitor 19C), urea water tank 200C, and wire harnesses 31C, 32C, and pipe 69C connected thereto are the same as in this embodiment. Therefore, the same reference numerals as those in the present embodiment are given.

  As shown in FIG. 8, the diesel engine 11 is disposed in the center of the rear part of the upper swing body 3C. 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 integrally arranged from the rear center of the upper swing body 3C 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 (the left side of the diesel engine 11) of the upper swing body 3C. The cooling unit 190 includes a radiator for the diesel engine 11 and a cooling unit 190A including the intercooler 65, a motor generator 12, a turning electric motor 21, a radiator 191B for electric drive parts, and a water pump 192B (see FIG. 19). A cooling unit 190B is included.

  The cabin 10 is disposed on the left front part of the upper swing body 3C.

  A boom support frame 180 that supports the boom 4 is firmly attached to the front center of the upper swing body 3C (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.

  The turning electric motor 21 is disposed near the center of the upper swing body 3C, that is, near the turn center of the upper swing body 3c.

  A fuel tank 160 is provided at the center on the right side of the upper swing body 3C (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 hybrid excavator is disposed at the left-side central portion (rear of the cabin 10) of the upper swing body 3C.

  The components mounted on the upper swing body 3 </ b> C described with reference to FIG. 8 are similarly arranged in the hybrid excavator according to the present embodiment described with reference to FIGS. 9 to 16 described later. Therefore, it is omitted in the description of the hybrid excavator according to this embodiment.

  The electric drive parts (inverter 18C, step-up / down converter 100C, and capacitor 19C) are arranged in two stages in front of the fuel tank 160, that is, on the right front of the upper swing body 3C (on the right side of the boom support frame 180). The Specifically, the capacitor 19C having a relatively large volume is disposed and fixed on the frame of the upper swing body 3C, and the inverter 18C and the buck-boost converter 100C are disposed side by side on the capacitor 19C.

  The inverter 18C and the step-up / down converter 100C are disposed and fixed on a mounting table raised from the upper surface of the frame of the upper swing body 3C, for example.

  The inverter 18C drives the motor generator 12 and the turning electric motor 21 using electric power supplied from the capacitor 19C via the step-up / down converter 100C. Therefore, the inverter 18C, the motor generator 12, and the turning electric motor 21 are connected by a wire harness 31C and a wire harness 32C, respectively. The outlets for the wire harnesses 31C and 32C in the inverter 18C, that is, the connectors for connecting the wire harnesses 31C and 32C are provided on the rear side surface.

  In order to avoid interference with the rear fuel tank 160, the wire harness 31C extending rearward from the inverter 18C is bent so as to be bent to the left and then vertically cut from the front to the rear on the left side of the fuel tank 160. Searched for. Then, the wire harness 31C is routed so as to be connected to the motor generator 12 disposed at the right rear portion of the upper swing body 3C after being bent to the right side at a position rearward of the fuel tank 160.

  Similarly to the wire harness 31C, the wire harness 32C extending rearward from the inverter 18C is bent to the left and then arranged between the fuel tank 160 and the right frame 180R so as to extend from the front to the rear. Searched for. Then, after being bent to the left at a position rearward from the rear end of the right frame 180R, it is routed so as to be connected to the turning electric motor 21 disposed near the center of the upper turning body 3C.

  In the drawing, a wire harness connecting the capacitor 19C and the step-up / down converter 100C and a wire harness connecting the step-up / down converter 100C and the inverter 18C are not shown.

  The urea water tank 200C is provided at the left center part of the upper swing body 3C. Specifically, it is disposed between the hydraulic oil tank 170 and the cooling unit 190 (at the rear of the hydraulic oil tank 170 and in front of the cooling unit 190). The urea water tank 200C and the exhaust gas processing device 150 are connected by a pipe 69C, and urea water is supplied from the urea water tank 200C to the exhaust gas processing device 150 through the pipe 69C.

  The piping 69C extending from the urea water tank 200C is routed so as to cross from the left to the right in front of the diesel engine 11, and is connected to the exhaust gas processing device 150 disposed at the right rear portion of the upper swing body 3C. Connected.

  In this way, the electric drive component (inverter 18C) and the urea water tank 200C are respectively disposed adjacent to the rear portion (right rear portion) of the upper swing body 3C, the exhaust gas processing device 150, It is necessary to be connected by the wire harness 31c and the pipe 69C. Therefore, if the electric drive parts and the urea water tank 200 are distributed and arranged as in this comparative example, the wire harness 31C and the rear part (right rear side) from different parts on the upper swing body 3c, and The pipe 69C is routed. That is, the wire harness 31C and the pipe 69C are routed in completely different portions in the upper swing body 3C. Then, it is necessary to arrange other parts so as to avoid both the wire harness 31C and the pipe 69C in a plan view, or the situation where the wire harness 31C or the pipe 69C cannot be routed due to the arrangement of the other parts. May occur and layout efficiency is poor.

  Therefore, in this embodiment, the urea water tank 200 is disposed in the right front portion of the upper swing body 3 adjacent to the electric drive components (the inverter 18, the step-up / down converter 100, and the capacitor 19). Thereby, since the wire harness 31 (refer FIG. 9 etc.) and the piping 69 can be routed closely, layout efficiency can be improved. That is, an efficient arrangement of the urea water tank 200 can be realized. Hereinafter, with reference to FIGS. 9 to 18, the arrangement of the electric drive component and the urea water tank 200 in the hybrid excavator according to the present embodiment will be specifically described.

  9 to 18, the wire harness connecting the capacitor 19 and the buck-boost converter 100, the wire harness connecting the buck-boost converter 100 and the inverter 18, the urea water supply pump 70, the filter 71, and the like are not shown. ing.

  First, FIGS. 9 and 10 are 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, and capacitor 19) and urea water tank 200 according to the present embodiment. It is a right side view.

  As shown in FIGS. 9 and 10, the electric drive component and the urea water tank 200 are disposed on the right front portion of the upper swing body 3 (in front of the fuel tank 160 disposed in the right center portion). Specifically, the urea water tank 200 is disposed on the frame 3 a adjacent to the front of the fuel tank 160, and the electric drive component is disposed adjacent to the front of the urea water tank 200.

  The urea water tank 200 is disposed so as to include the front and rear positions at which the boom pins 4p are provided. However, as shown in FIG. 10, since the height of the boom pins 4p is lower than the height at which the boom pins 4p are inserted, When assembling, the boom pin 4p can be inserted from the right side.

  The electric drive parts are arranged in two stages. Specifically, as shown in FIG. 10, the capacitor 19 having a relatively large volume is fixed on the frame 3a of the upper swing body 3 via a support member 19M including a vibration damping rubber. On the capacitor 19, there is provided a mounting table 204 fixed to the frame 3a and raised from the upper surface of the frame 3a. The inverter 18 and the step-up / down converter 100 are fixed side by side on the upper surface of the mounting table 204 via a support member 18M including a damping rubber and a support member 100M, respectively.

  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 and the motor generator 12 and the turning electric motor 21 are connected by the wire harness 31 and the wire harness 32, respectively. The outlets for the wire harnesses 31 and 32 in the inverter 18, that is, the connectors for connecting the wire harnesses 31 and 32 are provided on the rear side surface.

  The inverter 18, the step-up / down converter 100, and the capacitor 19 correspond to other wire harnesses (not shown) (wire harness connecting the inverter 18 and the step-up / down converter 100, wire harness connecting the step-up / down converter 100 and the capacitor 19). A connection connector is also provided on each rear side surface.

  As shown in FIG. 9, the wire harness 31 extending rearward from the inverter 18 is bent to the left to avoid interference with the rear urea water tank 200 and then left of the urea water tank 200 and the fuel tank 160. On the other hand, it is routed so as to traverse from front to back. The wire harness 31 is routed so as to be connected to the motor generator 12 disposed at the right rear portion of the upper swing body 3 after being bent to the right side at a position behind the fuel tank 160.

  Similarly to the wire harness 31, the wire harness 32 extending rearward from the inverter 18 is bent leftward, and then extends from the front to the rear between the urea water tank 200 and the fuel tank 160 and the right frame 180R. Arranged to exist. Then, after being bent to the left at a position rearward from the rear end of the right frame 180R, it is routed so as to be connected to the turning electric motor 21 disposed near the center of the upper turning body 3.

  As shown in FIG. 9, the pipe 69 extending from the urea water tank 200 is routed so as to run vertically from the front to the rear on the left side of the urea water tank 200 and the fuel tank 160, as in the case of 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 harness 31 and the pipe 69 are routed so as to overlap each other in a plan view in a portion that vertically cuts from the front to the rear of the upper swing body 3. Thereby, since the area | region which the wire harness 31 and the piping 69 occupy can be reduced by planar view, the component mounted on the upper turning body 3 can be arrange | positioned efficiently. That is, an efficient arrangement of the urea water tank 200 can be realized.

  Further, in the portion where the wire harness 31 and the pipe 69 are routed so as to overlap in a plan view, the wire harness 31 and the pipe 69 may be bundled together, for example, by being accommodated in the same corrugated pipe. Thereby, the heat generated by energization in the wire harness 31 can be efficiently received by the pipe 69. That is, it is possible to make the urea water difficult to freeze.

  In addition, the wire harnesses 31 and 32 are routed so as to be positioned above the pipe 69 in the portion (including the portion bundled together as described above) routed adjacent to the pipe 69. Thereby, even when urea water leaks from the pipe 69, it is possible to prevent the urea water from being applied to the wire harnesses 31 and 32.

  Moreover, as shown in FIG. 10, the electric drive component and the urea water tank 200 are covered with the cover 202 in a mode of being stored in the same space. Thereby, the urea water in the urea water tank 200 can be warmed by the effect | action of the heat_generation | fever of an electric drive component. That is, it is possible to make the urea water difficult to freeze.

  The cover 202 is provided with a lid 203 so that an operator can access the filler 230 of the urea water tank 200.

  Next, FIGS. 11 and 12 are plan 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, and capacitor 19) and urea water tank 200 according to the present embodiment. It is a figure and a right view. Hereinafter, a description will be given centering on differences from the first example.

  As shown in FIGS. 11 and 12, the electric drive component and the urea water tank 200 are arranged at the front right side of the upper swing body 3 (in front of the fuel tank 160 arranged at the right center) as in the first example. Is done. Specifically, the urea water tank 200 is disposed on the frame 3 a adjacent to the front of the fuel tank 160, and the electric drive component is disposed adjacent to the front of the urea water tank 200.

  The electric drive parts are arranged in two stages. Specifically, as shown in FIG. 12, the capacitor 19 having a relatively large volume is fixed on the frame 3a of the upper swing body 3 via a support member 19M including a vibration damping rubber, as in the first example. . On the capacitor 19, there is provided a mounting table 204 fixed to the frame 3a and raised from the upper surface of the frame 3a. The inverter 18 and the step-up / down converter 100 are fixed side by side on the top surface of the mounting table 204 via a support member 18M including a damping rubber and a support member 100M, respectively.

  Unlike the first example, the outlets for the wire harnesses 31 and 32 in the inverter 18, that is, the connectors for connecting the wire harnesses 31 and 32 are provided on the left side surface.

  The inverter 18, the step-up / down converter 100, and the capacitor 19 correspond to other wire harnesses (not shown) (wire harness connecting the inverter 18 and the step-up / down converter 100, wire harness connecting the step-up / down converter 100 and the capacitor 19). Similarly, the connection connectors are also provided on the left side surfaces of the respective connectors.

  As shown in FIG. 11, the wire harness 31 extending leftward from the inverter 18 is bent to the rear side, and then on the left side of the urea water tank 200 and the fuel tank 160, as in the first example. It is routed so as to traverse backward. The wire harness 31 is routed so as to be connected to the motor generator 12 disposed at the right rear portion of the upper swing body 3 after being bent to the right side at a position behind the fuel tank 160.

  Further, the wire harness 32 extending rearward from the inverter 18 is bent rearward in the same manner as the wire harness 31, and then between the urea water tank 200 and the fuel tank 160 and the right frame 180 </ b> R as in the first example. Routed to extend from front to back. Then, after being bent to the left at a position rearward from the rear end of the right frame 180R, it is routed so as to be connected to the turning electric motor 21 disposed near the center of the upper turning body 3.

  Thus, by providing the connection part (connection connector) of the wire harness in an electric drive component in a left side surface, it is not necessary to provide the space which wires a wire harness behind the electric drive component. Therefore, the layout efficiency of the electric drive parts in the front-rear direction can be further increased, and the mounting position of the electric drive parts can be further rearward. As a result, it is possible to reduce the possibility of the electric drive component coming into contact with an obstacle when the hybrid excavator is turning, and the safety of the hybrid excavator can be further enhanced. In particular, in order to drive the motor generator 12 and the turning electric motor 21, it is necessary to supply power of a relatively high voltage and a large current, and each wire harness connected to the electric drive component becomes relatively thick. It tends to be difficult (the settable bend R is relatively large). Therefore, the effect of improving the layout efficiency by the hybrid excavator according to the second example is very large.

  Next, FIGS. 13 and 14 are plan views of the upper-part turning body 3 showing a third example of the arrangement of the electric drive parts (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 figure and a right view. Hereinafter, a description will be given focusing on differences from the first example and the second example.

  As shown in FIGS. 13 and 14, the electric drive component and the urea water tank 200 are disposed on the right front portion of the upper swing body 3 (in front of the fuel tank 160 disposed in the right center portion). Specifically, the electric drive component is disposed adjacent to the front of the fuel tank 160, and the urea water tank 200 is disposed adjacent to the front of the electric drive component. That is, the front-rear arrangement of the electric drive component and the urea water tank 200 is reversed with respect to the second example.

  Moreover, as shown in FIG. 14, the upper end position of the urea water tank 200 arrange | positioned on the flame | frame 3a of the upper revolving structure 3 is higher than the upper end position of the electric drive components arrange | positioned by 2 steps | paragraphs. Therefore, the cover 202 that covers the electric drive component and the urea water tank 200 has a step so that the height of the portion that covers the electric drive component is lower than the height of the portion that covers the urea water tank 200.

  A storage box 205 that houses, for example, a grease pail can, an electric pump, an automatic greasing device including a grease gun, and the like is disposed on the portion of the cover 202 that includes the stepped portion and covers the electric drive component.

  The storage box 205 is attached after the mass production process of inserting the boom pins 4p.

  As described above, the urea water tank 200 is disposed in front of the electric drive component at the right front portion of the upper swing body 3 to further reduce the possibility that the electric drive component contacts an obstacle when the hybrid excavator is turned. This makes it possible to further increase the safety of the hybrid excavator.

  Further, since the fuel tank 160 storing the liquid and the urea water tank 200 are arranged apart from each other, it is possible to increase the resistance to the turning G of the hybrid excavator as compared with the case where the liquid tank 160 and the urea water tank 200 are arranged adjacent to each other. It becomes possible.

  15 and 16 are plan views of the upper-part turning body 3 showing a fourth example of the arrangement of the electric drive parts (the inverter 18, the step-up / step-down converter 100, and the capacitor 19) and the urea water tank 200 according to the present embodiment. It is a figure and a right view. Hereinafter, a description will be given centering on differences from the first to third examples.

  As shown in FIGS. 15 and 16, the electric drive component and the urea water tank 200 are disposed on the right front portion of the upper swing body 3 (in front of the fuel tank 160 disposed on the right center portion). Specifically, adjacent to the front of the fuel tank 160, the capacitor 19 among the electric drive parts is arranged and fixed on the frame 3a. On the capacitor 19, there is provided a mounting table 204 fixed to the frame 3a and raised from the upper surface of the frame 3a. The inverter 18, the step-up / down converter 100, and the urea water tank 200 among the electric drive parts are arranged on the upper surface of the mounting table 204 and fixed on the front and back, thereby being disposed on the capacitor 19. On the mounting table 204, an electric drive component (the inverter 18 and the step-up / down converter 100) is arranged adjacent to the front of the fuel tank 160, and the urea water tank 200 is arranged adjacent to the front of the electric drive component. .

  As shown in FIG. 16, the upper end position of the urea water tank 200 is higher than the position where the boom pin 4p is inserted, but the front and rear position of the urea water tank 200 is shifted from the front and rear position where the boom pin 4p is provided. Therefore, even when the urea water tank 200 is disposed on the capacitor 19, the boom pin 4p can be inserted from the right side when the boom 4 is assembled at the final stage of the mass production process.

  As described above, even when the volume of a part of the electric drive component is large (when the size of the capacitor 19 is large), the urea water tank 200 is arranged on the electric drive component so that it is efficient. The arrangement of the urea water tank 200 can be realized. In addition, the urea water tank 200 is arranged on the front side of the electric drive component, and the remaining electric drive components (inverter 18 and step-up / down converter 100) are arranged on the rear side, thereby affecting the insertion of the boom pin 4p. Can be avoided.

  As shown in FIGS. 15 and 16, the front end position of the urea water tank 200 is ahead of the front end position of the capacitor 19. Thereby, even when the urea water tank 200 is arranged on a part of the electric drive component (capacitor 19), the possibility that the electric drive component contacts an obstacle when the hybrid excavator turns is reduced. This makes it possible to increase the safety of the hybrid excavator.

  In this embodiment, since the urea water tank 200 can receive the heat of the electric drive component (capacitor 19) from the lower surface in addition to the rear side surface, the urea water in the urea water tank 200 is frozen. The effect of making it harder can be further enhanced.

  In addition, as shown in FIG. 16, the upper end position of the urea water tank 200 arrange | positioned on the mounting base 204 is higher than the upper end position of an electric drive component (the inverter 18 and the buck-boost converter 100) similarly to the 3rd example. . Therefore, the cover 202 that covers the electric drive component and the urea water tank 200 is such that the height of the portion that covers the electric drive component (the inverter 18 and the step-up / down converter 100) is lower than the height of the portion that covers the urea water tank 200. Has a step. A storage box 205 is disposed on the portion of the cover 202 that covers the electric drive component, including the stepped portion, as in the third example.

  Next, FIGS. 17 and 18 are plan views of the upper-part turning body 3 showing a fifth example of the arrangement of the electric drive components (inverter 18, step-up / down converter 100, and capacitor 19) and urea water tank 200 according to the present embodiment. It is a figure and a right view. Hereinafter, a description will be given centering on differences from the first to fourth examples.

  As shown in FIGS. 17 and 18, the electric drive component and the urea water tank 200 are arranged at the front right side of the upper swing body 3 (in front of the fuel tank 160 arranged at the right center) as in the first example. Is done. Specifically, the urea water tank 200 is disposed on the frame 3 a adjacent to the front of the fuel tank 160, and the electric drive component is disposed adjacent to the front of the urea water tank 200.

  The arrangement of the electric drive parts is the same as in the first example. Specifically, as shown in FIG. 18, the electric drive components are arranged in two layers. The capacitor 19 having a relatively large volume is fixed on the frame 3a of the upper swing body 3 via a support member 19M including a damping rubber. On the capacitor 19, there is provided a mounting table 204 fixed to the frame 3a and raised from the upper surface of the frame 3a. The inverter 18 and the step-up / down converter 100 are fixed side by side on the upper surface of the mounting table 204 via a support member 18M including a damping rubber and a support member 100M, respectively.

  The outlets for the wire harnesses 31 and 32 in the inverter 18, that is, the connectors for connection to the wire harnesses 31 and 32 are provided on the rear side surface (rear end surface) as in the first example.

  As shown in FIGS. 17 and 18, the rear end surface of the inverter 18 as a whole faces the urea water tank 200 in the front-rear direction, so the wire harness 31 extending rearward from the rear end surface of the inverter 18 is It bypasses the urea water tank 200 and extends toward the rear part of the upper swing body 3. Specifically, as shown in FIG. 17, the wire harness 31 extending backward from the rear end of the inverter 18 is bent to the right, unlike the first example, in order to avoid interference with the urea water tank 200. The urea water tank 200 is routed so as to pass from the front to the rear. Further, the wire harness 31 is a portion that passes to the right of the urea water tank 200, and includes a urea water tank 200 and an outer frame 181 (a component of the frame 3a) that longitudinally cuts the right end portion of the upper swing body 3 back and forth. It is routed between the left and right positions. In this example, as shown in FIG. 17 (and FIG. 20 described later), a space in the left-right direction through which the wire harness 31 can pass is provided between the urea water tank 200 and the outer frame 181. As shown in FIG. 18, two guide members 31 </ b> G for guiding the wiring route of the wire harness 31 are provided on the right side surface of the urea water tank 200. The wire harness 31 is a portion that passes to the right of the urea water tank 200 and is routed along a rearward downward path by being held by the guide member 31G. Further, the wire harness 31 is a portion that passes to the right of the urea water tank 200 and gradually approaches the center side of the upper swing body 3 (frame 3a) from the front to the rear, while the urea water tank 200 and the outer frame. It is routed in such a manner that it passes between 181 and dives under the urea water tank 200. The wire harness 31 extends below the upper swing body 3 and is connected to the motor generator 12 so as to pass under the urea water tank 200 and the fuel tank 160.

  Note that the urea water tank 200 in the present embodiment includes the tank body 200a and the tank storage container 212 (the tank reinforcing member 215 and the tank bracket 226) that stores (fixes) the tank body 200a as described above, and the guide member 31G. Is fixed to the tank storage container 213, for example.

  As shown in FIGS. 17 and 18, a cooling pipe 33 for circulating cooling water for cooling the inverter 18, the buck-boost converter 100, the capacitor 19, and the like is connected to the rear end surface of the inverter 18. Hereinafter, the cooling system for circulating the cooling water will be described with reference to FIG.

  FIG. 19 is a diagram illustrating an example of a configuration of a cooling system for circulating cooling water such as the inverter 18, the step-up / down converter 100, and the capacitor 19.

  As shown in FIG. 19, the cooling system includes a radiator 191B, a water pump 192B, a capacitor 19, an inverter 18, a step-up / down converter 100, and other objects to be cooled.

  Other cooling objects may include, for example, the motor generator 12, the turning electric motor 21, the speed reducer 13, and the like. Moreover, the cooling circuit shown in FIG. 19 is an example, and an arbitrary connection method may be employed.

  The water pump 192B sucks and discharges the cooling water cooled by the radiator 191B. The cooling water discharged from the water pump 192B circulates through the cooling pipes disposed adjacent to the capacitor 19, the inverter 18, the step-up / down converter 100, and other cooling objects, and returns to the radiator 191B. Thereby, the capacitor 19, the inverter 18, the buck-boost converter 100, etc. are cooled.

  As shown in FIGS. 17 and 18, the rear end surface of the inverter 18 faces the urea water tank 200 as a whole in the front-rear direction as described above, so that the cooling extending backward from the rear end surface of the inverter 18 is performed. The pipe 33 bypasses the urea water tank 200 and extends toward the rear part of the upper swing body 3. Specifically, as shown in FIG. 18, the cooling pipe 33 extending rearward from the rear end surface of the inverter 18 is bent downward to avoid interference with the urea water tank 200, and the urea water tank 200 and the fuel It is routed so as to pass under the tank 160 from front to back.

  Hereinafter, with reference to FIG. 20, the part of the cooling pipe 33 routed under the urea water tank 200 and the fuel tank 160 will be described.

  FIG. 20 is a bottom view of a portion of the upper swing body 3 where the urea water tank 200 is disposed.

  In the drawing, the lower surface of the urea water tank 200 is visible. Normally, a cover that covers the lower surface of the urea water tank 200 is attached to the frame 3a.

  As shown in FIG. 20, the frame 3 a includes frames 182 and 183 extending in the left-right direction connected to the outer frame 181. The frames 182 and 183 are provided with a predetermined interval in the front-rear direction, and the urea water tank 200 is removed through the space in the front-rear direction between the frame 182 and the frame 183 by removing the cover from the frame 3a. Is visible.

  On the lower surface of the urea water tank 200 (specifically, the tank body 200a), a drain port (not shown) for discharging the internal urea water is provided, and a plug 200D for closing the drain port is provided. Thereby, by removing the above-mentioned cover from the frame 3a, the drain plug 211 can be visually recognized, and the operator can easily access the drain plug 211 from under the upper swing body 3 to perform the maintenance work of the urea water tank 200. It can be performed.

  In addition, a certain amount of space is provided between the front end position of the urea water tank 200 and the rear end position of the frame 182, and the cooling pipe 33 extending from the rear end surface of the inverter 18 is bent downward, Passing through the space (gap), it is under the urea water tank 200. A portion of the cooling pipe 33 that passes under the urea water tank 200 is provided with a drain port (not shown) for discharging the cooling water in the cooling pipe 33 and a drain plug 33D that closes the drain port. . Thereby, by removing the above-mentioned cover from the frame 3a, the drain plug 33D can be visually recognized, and the operator can easily access the drain plug 211 from below the upper swing body 3 and perform maintenance of the cooling system. Can do. Further, the drain plug 211 of the urea water tank 200 and the drain plug 33D of the cooling pipe 33 are visible at the same time by removing the above-mentioned cover from the frame 3a. Therefore, both the urea water tank 200 and the cooling system can be maintained at the same time, and the efficiency of the maintenance work can be improved.

  Further, as described above, the wire harness 31 extending from the rear end of the inverter 18 passes through the space (gap) between the outer frame 181 and the urea water tank 200 (the right side surface thereof), and the urea water tank 200 Lurking underneath.

  In addition, the wire harness 31 and the cooling pipe 33 that are submerged under the urea water tank 200 pass through a through hole (not shown) provided in the frame 183 and extend to the rear part of the upper swing body 3.

  Thus, the storage tank (urea water tank) is disposed in front of the fuel tank behind the power storage device and the drive device. According to this configuration, the storage tank is disposed behind the power storage device and the driving device that are relatively low in comparison with the storage tank, and in front of the fuel tank that is relatively high in comparison with the storage tank. Therefore, it is possible to easily configure the layout of the steps for ascending / descending configured to the right front.

  In addition, a harness that supplies electric power to the electric motor and a cooling pipe that circulates cooling water through the driving device are connected to the rear end of the driving device. At least one of the harness and the cooling pipe is extended toward the rear part of the upper swing body (for example, the place where the assist motor is disposed), bypassing the urea water tank. Even if the urea water tank is disposed in front of the fuel tank and behind the drive unit, the harness and the cooling pipe can be extended behind the upper swing body.

  Alternatively, the cooling pipe may be bypassed in such a manner that it passes under the urea water tank. According to this configuration, it is possible to prevent the space in the region between the boom support frame and the fuel tank due to the addition of the urea water tank from being compressed. The space under the urea water tank is utilized. The driving device is disposed on the power storage device. For this reason, the harness and the cooling pipe connected to the drive device face the urea water tank. Even with such a configuration, it is possible to actively bypass the lower side and the side of the urea water tank.

  Moreover, the 1st drain port of a storage tank and the 2nd drain port of a cooling pipe are arrange | positioned in the same position, and are covered with one cover. By removing this one cover, any drain port can be seen at the same time. In addition, if each cover is covered with a different cover, it is necessary to store the cover to be removed according to the maintenance target, but since the cover to be removed is determined regardless of the maintenance target, maintenance is easy. Become.

  In addition, the harness of the drive device passes through a space for passing the harness provided between the urea water tank and the outer frame, and does not consume an area between the boom support frame and the fuel tank. The harness is led to the lower side of the fuel tank. At that time, the guide member provided in the urea water tank is guided so as to gradually descend backward. The harness is guided under the fuel tank from a position above the power storage device. According to such a configuration, even when the harness is hard, the harness can be gradually guided downward, placing a burden on the harness. There is no.

  Further, after the harness passes through the urea water tank and is guided under the fuel tank, the harness is guided so as to approach the central side of the revolving frame to some extent. After detouring the urea water tank, it is arranged as close to the center as possible so that disturbances applied from the side of the swivel frame can be avoided.

  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 Frame (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 (drive device)
18M Support member 19 Capacitor (power storage device)
19M Support member 21 Electric motor for turning 22 Resolver 23 Mechanical brake 24 Turning speed reducer 25 Pilot line 26 Operating device 26A, 26B Lever 26C Pedal 27, 28 Hydraulic line 29 Pressure sensor 30 Controller 31 Wire harness 31G Guide member 32 Wire harness 33 Cooling pipe 33D Drain plug 69 Urea water supply pipe 100 Buck-boost converter (drive device)
100M Support member 150 Exhaust gas treatment device 160 Fuel tank 170 Hydraulic oil tank 180 Boom support frame 181 Outer frame 182, 183 Frame 190, 190A, 190B Cooling unit 191B Radiator 192B Water pump 200 Urea water tank (storage tank)
202 Cover 203 Lid 204 Placement table 205 Storage box 211 Drain plug

Claims (15)

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;
A power storage device mounted on the right front of the upper swing body,
A drive device that is mounted on the right front portion of the upper swing body adjacent to the power storage device and drives the electric motor with electric power supplied from the power storage device;
An exhaust gas treatment device mounted on the rear part of the upper rotating body adjacent to the diesel engine and treating exhaust gas of the diesel engine using a treatment agent;
It is mounted on the right front part of the upper swing body adjacent to the power storage device and the drive device, and has a storage tank for storing the processing agent.
Hybrid excavator. A pipe for supplying the processing agent from the storage tank to the exhaust gas processing device and a harness for supplying electric power from the driving device to the electric motor are partially bundled together.
The hybrid excavator according to claim 1. The storage tank is disposed in front of at least one of the power storage device and the drive device.
The hybrid excavator according to claim 1 or 2. On one of the power storage device and the drive device, the other of the power storage device and the drive device, and the storage tank are disposed.
The hybrid excavator according to any one of claims 1 to 3. The front end position of the storage tank is ahead of the front end position of the one of the power storage device and the drive device.
The hybrid excavator according to claim 4. The power storage device and the drive device have a connecting portion on the left side with a harness for supplying power to the electric motor,
The hybrid excavator according to any one of claims 1 to 5. The storage tank is disposed behind the power storage device and the drive device.
The hybrid excavator according to claim 1. A harness that supplies electric power to the electric motor and a cooling pipe that circulates cooling water of the driving device are connected to the rear end of the driving device,
At least one of the harness and the cooling pipe bypasses the storage tank and extends from the rear end portion of the drive device toward the rear portion of the upper swing body,
The hybrid excavator according to claim 7. The drive device has the entire rear end facing the storage tank in the front-rear direction,
The cooling pipe bypasses the storage tank in a manner of passing under the storage tank;
The hybrid excavator according to claim 8. The driving device is disposed on the power storage device.
The hybrid excavator according to claim 9. The storage tank includes a first drain port for discharging the processing agent on a lower surface thereof, and a first drain plug for closing the first drain port,
The cooling pipe includes a second drain port for discharging the cooling water to a portion passing under the storage tank, and a second drain plug for closing the second drain port,
The first drain plug and the second drain plug are simultaneously visible from below the upper swing body,
The hybrid excavator according to claim 9 or 10. Below the storage tank on the lower surface of the upper swing body, an opening and a cover covering the opening are provided,
The first drain plug and the second drain plug are visible at the same time from below the upper swing body by removing the cover from the lower surface of the upper swing body.
The hybrid excavator according to claim 11. The right end of the revolving frame that forms the lower part of the upper revolving structure is provided with an outer frame that is vertically cut in the front-rear direction, and the drive device has a rear end facing the storage tank in the front-rear direction
The harness passes through the right side of the storage tank and bypasses the storage tank in a mode of passing between the storage tank and the outer frame.
The hybrid excavator according to any one of claims 8 to 12. On the right side surface of the storage tank, a guide member for guiding the routing route of the harness is provided,
The harness is guided so as to be lowered rearward by the guide member on the right side of the storage tank.
The hybrid excavator according to claim 13. While the harness is close to the center side of the swivel frame, it passes between the storage tank and the outer frame, and passes under the storage tank and a fuel tank disposed behind the storage tank. Extending toward the rear of the upper swing body,
The hybrid excavator according to claim 13 or 14.

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