JP6893782B2 - Excavator - Google Patents

Description

The present invention relates to an excavator including an exhaust gas treatment device that purifies the exhaust gas of a diesel engine using a treatment agent (urea aqueous solution).

In recent years, diesel engines have been required to comply with higher emission regulations. Therefore, for excavators powered by diesel engines, exhaust gas treatment devices that comply with higher-order exhaust gas regulations may be adopted.

As the exhaust gas treatment device of a diesel engine, a urea selective reduction type NOx treatment device using an aqueous urea solution (liquid reducing agent) as a treatment agent is often used (see, for example, Patent Document 1).

In Patent Document 1, the urea aqueous solution (hereinafter, simply referred to as "urea water") is stored in the liquid reducing agent tank (hereinafter, simply referred to as "urea water tank"), and the urea water tank is exhausted by a supply pipe. Connected to. Then, the urea water in the urea water tank is supplied to the exhaust pipe of the diesel engine by the power of the supply pump.

Japanese Unexamined Patent Publication No. 2013-160005

Usually, the main components of the excavator are often mounted from the center to the rear of the swivel body. Therefore, the urea water tank to be additionally mounted may be arranged on the opposite side of the cabin in the front part of the swivel body, that is, on the right front part of the swivel body. In addition, a fuel tank may be provided behind the front right side of the swivel body, that is, in the center right side of the swivel body, and the front end surface of the fuel tank is used to check the remaining fuel amount at the time of refueling. A fuel gauge may be provided.

However, the urea water tank is relatively high because it needs to store a large amount of urea water. Therefore, there is a possibility that the fuel gauge provided on the front end surface of the fuel tank cannot be visually recognized.

Therefore, in view of the above problems, it is an object of the present invention to provide a shovel capable of arranging the urea water tank on the right front portion of the swirl body and visually recognizing the fuel gauge provided on the front end surface of the fuel tank.

In order to achieve the above object, in one embodiment,
With a swivel body
An ascending / descending step provided on the right front portion of the swivel body and including a plurality of step portions as a scaffolding for the user and a plurality of step portions connecting adjacent step portions among the plurality of step portions.
A first storage tank mounted adjacent to the rear of the elevating step of the swivel body,
A gauge indicating the liquid level, which is provided on the front end surface of the first storage tank, is provided.
One of the plurality of step portions adjacent to the first storage tank is arranged at a position higher than the gauge so as to avoid a position in the left-right direction in which the gauge is provided.
A predetermined member is arranged in front of the gauge and on a space adjacent to the one step portion in the left-right direction so that the gauge can be visually recognized through the space.
Excavator is provided.

According to the above-described embodiment, it is possible to provide a shovel capable of arranging the urea water tank on the right front portion of the swirl body and visually recognizing the fuel gauge provided on the front end surface of the fuel tank.

It is a side view of the excavator. It is a figure which shows an example of the structure of the drive system of a shovel. It is a figure which shows an example of the structure of the power storage system of a shovel. It is a side view of a riff mug machine. It is a figure which shows an example of the structure of the drive system of a riff mag machine. It is a figure which shows an example of the structure of a Rifmag driver. It is a figure which shows the structure of the exhaust gas processing apparatus mounted on the work machine which concerns on this embodiment. It is a top view which shows an example of the arrangement structure of various parts in the upper swing body of the work machine which concerns on this embodiment. It is a right side view which shows an example of the arrangement structure of various parts in the right front part of the upper swing body of the work machine which concerns on this embodiment. It is a front view which shows an example of the arrangement structure of various parts in the right front part of the upper swing body of the work machine which concerns on this embodiment. It is a perspective view which shows the right front part of the upper swing body of the work machine which concerns on this embodiment. It is a front view which shows the right front part of the upper swing body of the work machine which concerns on this embodiment. It is sectional drawing which shows an example of the fixed structure of an electric drive component. It is a perspective view which shows an example of the support member which fixes an inverter, a buck-boost converter, a riff mag driver, and a work light. It is a figure which shows an example of the cooling system of an electric drive component. It is a side view which shows another example of the structure of a handrail. It is a front view which shows another example of the structure of a handrail. It is a top view which shows another example of the structure of a handrail.

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

First, the basic configuration of the excavator will be described as an example of the hybrid type work machine according to the present embodiment with reference to FIGS. 1 to 3.

FIG. 1 is a side view showing an excavator which is an example of a work machine according to the present embodiment.

As shown in FIG. 1, the upper swivel body 3 is mounted on the lower traveling body 1 of the excavator via the swivel 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, arm 5, and bucket 6 as attachments are hydraulically driven by the boom cylinder 7, arm cylinder 8, and bucket cylinder 9 as hydraulic actuators, respectively. Further, the upper swing body 3 is provided with a cabin 10 on which an operator is boarded, and is also equipped with a diesel engine 11 (see FIG. 2) which is a power source.

FIG. 2 is a block diagram showing a configuration of a drive system of an excavator, which is an example of a work machine according to the present embodiment. In the figure, the mechanical power system is shown by a double line, the high-pressure hydraulic line is shown by a thick solid line, the pilot line is shown by a broken line, and the electric drive / control system is shown by a thin solid line.

The diesel engine 11 as the main drive unit and the motor generator 12 as the assist drive unit in the excavator according to the present embodiment are connected to two input shafts of the speed reducer 13, respectively. A main pump 14 and a pilot pump 15 are connected to the output shaft of the speed reducer 13. That is, the diesel engine 11 drives the main pump 14 and the pilot pump 15 via the speed reducer 13, and the motor generator 12 assists the diesel engine 11 via the speed reducer 13 to drive the main pump 14 and the pilot pump. Drive 15. Further, the motor generator 12 is connected to the power storage system 120 including the capacitor 19 (see FIG. 3) as an example of the power storage device via the inverter 18A.

The main pump 14 is connected to the control valve 17 via the high pressure hydraulic line 16. The main pump 14 is, for example, a variable displacement hydraulic pump, and the stroke length of the piston can be adjusted by controlling the angle (tilt angle) of the swash plate to control the discharge flow rate.

The pilot pump 15 is, for example, a fixed displacement hydraulic pump. The pilot pump 15 is connected to the operating device 26 via the pilot line 25.

The control valve 17 is a control device that controls the hydraulic system according to the operation in the operation device 26 (the pilot pressure on the secondary side input via the hydraulic line 27). The hydraulic motors 1A (for right), 1B (for left), boom cylinder 7, arm cylinder 8, and bucket cylinder 9 for driving the lower traveling body 1 are connected to the control valve 17 via a high-pressure hydraulic line.

The operating device 26 includes levers 26A and 26B and pedals 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.

Further, in the excavator according to the present embodiment, the swivel mechanism 2 is electrified, and a swivel motor 21 for driving the swivel mechanism 2 is provided. The swivel motor 21 is connected to the power storage system 120 via the inverter 18B. A resolver 22, a mechanical brake 23, and a swivel reducer 24 are connected to the rotary shaft 21A of the swivel motor 21.

In the present embodiment, the inverters 18A and 18B are housed in the same housing (hereinafter referred to as "inverter housing") 18H (see FIG. 8 and the like). Hereinafter, the component in which the inverters 18A and 18B are integrated will be referred to as an inverter 18.

The controller 30 is a main control device that controls the drive of the excavator according to the present embodiment. The controller 30 is composed of, for example, a CPU and an arithmetic processing device including 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 (the pilot pressure corresponding to the turning operation of the upper turning body 3 in the operating device 26) into a speed command, and controls the drive of the turning electric motor 21.

Further, the controller 30 controls the operation of the motor generator 12 (switching between electric operation (assist operation) and power generation operation), and drives and controls the buck-boost converter 100 (see FIG. 3) to control the capacitor 19 (FIG. 3). Refer to) for charge / discharge control. The controller 30 is a buck-boost converter based on the charging state of the capacitor 19, the operating state of the motor generator 12 (electric operation (assist operation) or power generation operation), and the operating state of the turning motor 21 (power running operation or regenerative operation). Charging / discharging control of the capacitor 19 is performed by switching between the step-up operation and the step-down operation of 100.

FIG. 3 is a circuit diagram showing an example of the configuration of the power storage system 120 of the excavator, which is an example of the work machine according to the present embodiment. 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 the transfer of electric power between the capacitor 19, the motor generator 12, and the turning motor 21. The capacitor 19 is provided with a capacitor voltage detection unit 112 for detecting the voltage value and the current value of the capacitor 19, and a capacitor current detection unit 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 buck-boost converter 100 switches between a step-up operation and a 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 motor 21. The DC bus 110 is arranged between the inverters 18A and 18B and the buck-boost converter 100, and the capacitor 19, the motor generator 12, and the turning motor 21 transfer and receive electric power via the DC bus 110.

Switching control between the step-up operation and the 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 done based on the detected capacitor current value.

Next, with reference to FIGS. 4 to 6, the basic configuration of the riff mag machine will be described as another example of the hybrid type work machine according to the present embodiment. Hereinafter, the same configurations as those of the excavator described above will be described with the same reference numerals and different parts will be mainly described.

The configuration of the power storage system 120 of the riff mag machine is shown in FIG. 3, similar to the excavator described above.

FIG. 4 is a side view showing a riff mug machine which is another example of the work machine according to the present embodiment.

As shown in FIG. 4, in the lift mug machine according to the present embodiment, a lifting magnet 6A (hereinafter, referred to as “lift mug”) is attached to the tip of the arm 5 instead of the bucket 6 of the excavator described above.

FIG. 5 is a block diagram showing a configuration of a drive system of a riff mag machine which is another example of the work machine according to the present embodiment. Similar to the case of FIG. 2, in the figure, the mechanical power system is shown by a double line, the high-pressure hydraulic line is shown by a thick solid line, the pilot line is shown by a broken line, and the electric drive / control system is shown by a thin solid line.

The Rifmag driver 48 is arranged in the power path between the inverter 18A that drives and controls the power storage system 120 and the motor generator 12 and the Rifmag 6A, and excites the electromagnetic coil 6M (see FIG. 6) included in the Rifmag 6A. It is a drive circuit to be used. The Rifmag driver 48 has a configuration capable of applying the voltage Vdc of the DC bus 110 to the Rifmag 6A by switching the polarity, and by such a configuration, the Rifmag 6A is attracted and released (that is, the electromagnetic coil 6M is excited). (Demagnetization) can be switched. Hereinafter, the configuration of the riff mag driver 48 will be described with reference to FIG.

FIG. 6 is a diagram showing an example of the configuration of the riff mag driver 48. The riff mag driver 48 is composed of a known H-bridge circuit including switching elements 48Ta to 48Td and commutation diodes 48Da to 48Dd. Specifically, the switching elements 48Ta and 48Tb and the switching elements 48Tc and 48Td are connected in series, and the switching elements 48Ta and 48Tb and the switching elements 48Tc and 48Td connected in series are connected in parallel. Further, the terminal MP and the terminal MN of the electromagnetic coil 6M of the Rifmag 6A are connected to the intermediate points of the switching elements 48Ta and 48Tb and the switching elements 48Tc and 48Td connected in series, respectively. Further, commutation diodes 48Da to 48Dd are connected in parallel to each of the switching elements 48Ta to 48Td.

When the electromagnetic coil 6M of the Rifmag 6A is excited (when the suction switch 42 is turned on), the switching elements 48Ta and 48Td are turned on, and the switching elements 48Tb and 38Tc are turned off. As a result, the voltage Vdc of the DC bus 110 is applied to the electromagnetic coil 6M of the riff mag 6A via the switching elements 48Ta and 48Td, and an exciting current flows from the terminal MP of the electromagnetic coil 6M toward the terminal MN. Therefore, the electromagnetic coil 6M is excited, and the riff mag 6A can adsorb a steel material or the like.

On the other hand, when the electromagnetic coil 6M of the Rifmag 6A is degaussed (that is, when the release switch 44 is turned on), the switching elements 48Tb and 48Tc are turned on and the switching elements 48Ta and 48Td are turned off. As a result, the voltage Vdc of the DC bus 110 is applied to the electromagnetic coil 6M of the Rifmag 6A in the opposite direction, and the voltage Vdc of the DC bus 110 is applied to the electromagnetic coil 6M from the electromagnetic coil 6M via the commutation diode 48Dc, the DC bus 110, and the commutation diode 48Db. Return degaussing current flows. Therefore, the electromagnetic coil 6M of the Rifmag 6A is degaussed, and the steel material or the like adsorbed on the Rifmag 6A can be released. At this time, the inverter 18A supplies the regenerative power discharged from the electromagnetic coil 6M to the DC bus 110 as a degaussing current to the motor generator 12.

The controller 30 outputs a control command to the rifmag driver 48 in response to the operation input from the suction switch 42 and the release switch 44, and controls the drive of the rifmag 6A (specifically, the electromagnetic coil 6M). That is, when the suction switch 42 is turned on, the controller 30 outputs a control command to turn on the switching elements 48Ta and 48Td and turn off the switching elements 48Tb and 48Tc to the rifmag driver 48. At this time, the controller 30 can adjust the voltage applied to the electromagnetic coil 6M by controlling the switching elements 48Ta and 48Td by PWM (Pulse Width Modulation). Further, when the suction switch 42 is turned on, the controller 30 outputs a control command to turn on the switching elements 48Tb and 48Tc and turn off the switching elements 48Ta and 48Td to the riff mag driver. At this time, the controller 30 can adjust the voltage applied to the electromagnetic coil 6M by PWM-controlling the switching elements 48Tb and 48Tc.

In the following description, the inverters 18 (inverters 18A and 18B), the buck-boost converter 100, the riff mag driver 48, and the capacitor 19 may be collectively or individually referred to as "electric drive components".

As described above, the excavator, which is an example of the work machine according to the present embodiment described above, and the series of work machines including the riff mag machine, which is another example (hereinafter referred to as the work machine series), are common to each work machine. It has a configuration and a configuration peculiar to each work machine. Hereinafter, the configuration common to each work machine included in the work machine series including the excavator and the riff mag machine will be mainly described.

Next, with reference to FIG. 7, the configuration of the exhaust gas treatment device 150 that purifies the exhaust gas discharged from the diesel engine 11 will be described.

FIG. 7 is a diagram showing a configuration example of the exhaust gas treatment device 150. In the present embodiment, the exhaust gas treatment 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.

The 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 treatment device 150 from the exhaust pipe 62, is purified by the exhaust gas treatment device 150, and then is discharged to the atmosphere.

On the other hand, the intake air introduced into the intake pipe 64 through the air cleaner 63 passes through the turbocharger 61 and the intercooler 65 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.

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

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

As a matter of course, a treatment agent other than urea water may be used as long as it is a treatment agent capable of continuously reducing NOx.

A urea water injection valve 68 for supplying urea water to the selective reduction catalyst 67 is provided on the upstream side 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 urea water supply pump 70 is provided in the 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. Then, the urea water is injected from the urea water injection valve 68 into the exhaust pipe 62 at an upstream position 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 produce ammonia. The generated ammonia reduces NOx contained in the exhaust gas in the selective reduction catalyst 67. As a result, the exhaust gas discharged from the diesel engine 11 is purified.

The first NOx sensor 72 is arranged on the upstream side of the urea water injection valve 68. The second NOx sensor 73 is arranged 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 each arrangement position.

A urea water remaining amount sensor 74 is arranged 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 injects an appropriate amount of urea water by the urea water injection valve 68 and the urea water supply pump 70 based on the NOx concentration detected by each of the first NOx sensor 72 and the second NOx sensor 73. 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 amount ratio. For example, a urea water remaining amount ratio of 50% indicates that 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 the ECM 60 that controls the diesel engine 11 via a communication means (for example, a LAN conforming to the CAN protocol). Further, the ECM 60 is connected to the excavator controller 76 via a communication means (for example, a LAN conforming to the CAN protocol).

Various information of the exhaust gas treatment device 150 included in the exhaust gas controller 75 can also 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, RAM, ROM, input / output ports, storage devices, and the like.

A monitor 77 (display device) is connected to the excavator controller 76. Information and data such as warnings and operating conditions are displayed on the monitor 77.

The exhaust gas treatment device 150 has an antifreezing mechanism for preventing the urea water tank 200 and the pipe 69 from freezing. In the present embodiment, the antifreeze mechanism utilizes the engine cooling water of the diesel engine 11 passing through the pipe 80. Specifically, the engine cooling water immediately after cooling the diesel engine 11 passes through the first portion 80a of the pipe 80 and reaches the second portion 80b while maintaining a relatively high temperature. The second portion 80b is a part of the pipe 80 in contact with 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 inside the urea water tank 200 as it flows through the second portion 80b. After that, the engine cooling water supplies heat to the pipe 69 and the urea water inside the pipe 69 as it flows through the third portion 80c of the pipe 80 installed adjacent to the pipe 69. After that, the engine cooling water that has released heat and has reached a relatively low temperature reaches the radiator 191 (see FIG. 8) through the fourth portion 80d of the pipe 80. In this way, the antifreezing mechanism supplies heat to the urea water tank 200 and the pipe 69 by using the engine cooling water to prevent the urea water tank 200 and the pipe 69 from freezing.

Next, with reference to FIGS. 8 to 12, the arrangement structure of the work machine (excavator and riff mag machine) according to the present embodiment in the upper swing body 3, that is, each work machine of the work machine series according to the present embodiment ( The layout structure common to excavators and riff mag machines) will be described.

FIG. 8 is a plan view showing an example of an arrangement structure of various parts in the upper swing body 3 of the work machine according to the present embodiment. FIG. 9 is a right side view showing an example of an arrangement structure of various parts in the front right side of the upper swing body 3 of the work machine according to the present embodiment. FIG. 10 is a front view showing an example of an arrangement structure of various parts in the front right side of the upper swing body 3 of the work machine according to the present embodiment. FIG. 11 is a perspective view showing the front right side of the upper swing body 3 of the work machine according to the present embodiment, and FIG. 11 (a) shows a perspective view seen from diagonally upper right front and FIG. 11 (b). ) Represents a perspective view seen from diagonally upper left and forward. FIG. 12 is a front view showing the front right side of the upper swing body 3 of the work machine according to the present embodiment.

As shown in FIG. 8, the upper swivel body 3 includes the swivel frame 140, and various parts mounted on the upper swivel body 3 are fixed on the swivel frame 140.

The swivel frame 140 is centered on a pair of center frames 141 and side frames 142 extending in a manner traversing the upper swivel body 3 in the front-rear direction, and other reinforcing frames and cross members connecting the frames in the left-right direction. Etc. are included.

The center frame 141 includes a pair of left side frame 180L and right side frame 180R that support the boom 4 in a manner of sandwiching the boom 4 from the left and right in the front portion of the upper swing body 3.

The side frame 142 includes a side frame 142L provided at the left end of the upper swing body 3 and a side frame 142R provided at the right end of the upper swing body 3.

As shown in FIG. 8, the diesel engine 11 is arranged in the center of the rear part of the upper swing body 3. The diesel engine 11 is assembled to the center frame 141 via a vibration-proof mount (not shown).

A speed reducer 13 located on the right side thereof is connected to the diesel engine 11 so as to be able to transmit power, and a motor generator is connected to the side opposite to the side to which the diesel engine 11 is connected (that is, the right side) in the speed reducer 13. 12 are connected so that power can be transmitted. That is, the diesel engine 11, the speed reducer 13, and the motor generator 12 are integrally arranged from the rear center to the right rear portion of the upper swing body 3.

An exhaust gas treatment device 150 is arranged above the motor generator 12 and the speed reducer 13. The exhaust gas treatment device 150 and the diesel engine 11 (specifically, the turbocharger 61 shown in FIG. 7) are connected by an exhaust pipe 62.

A cooling unit 190 is arranged at the rear left side of the upper swing body 3 (that is, the left side of the diesel engine 11). The cooling unit 190 includes a radiator 191 for a diesel engine 11, a radiator 192 for a hybrid, a water pump 193, and the like.

The cabin 10 is arranged on the left front portion of the upper swivel body 3.

A boom 4 (not shown) is supported at the center of the front portion of the upper swing body 3 (to the right of the cabin 10) so as to be sandwiched between the left frame 141L and the right frame 141R from the left and right. Specifically, the boom 4 is sandwiched between the left frame 141L and the right frame 141R, and the boom pin (not shown) penetrates the left frame 141L, the boom 4, and the right frame 141R in the vertical direction. It is rotatably supported.

The swivel motor 21 is arranged near the center of the upper swivel body 3, that is, near the swivel center of the upper swivel body 3.

A fuel tank 160 (an example of a first storage tank) is provided in the center right side of the upper swing body 3 (in front of the speed reducer 13, the motor generator 12, and the exhaust gas treatment 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).

As shown in FIG. 8, the electric drive component and the urea water tank 200 are supported by the boom 4 on the right front side of the upper swing body 3 (that is, on the front side and the front center of the fuel tank 160 arranged in the center right side). Is placed on the right side of).

As shown in FIG. 9, the urea water tank 200 (an example of the second storage tank) is fixed on the swivel frame 140 (floor surface 143) adjacent to the front of the fuel tank 160.

As shown in FIGS. 8 to 10, a filler pipe 201 extending upward is attached to the urea water tank 200, and a filler 202 is provided at the tip of the filler pipe 201. By lifting and installing the filler 202 at a relatively high position in this way, it becomes easier for the operator to replenish the urea water while climbing the elevating step 220 described later. That is, for example, when the filler 202 is installed near the upper end position of the urea water tank 200, urea is climbed in the first step 221 (described later) or the second step 222 (described later) of the elevating step 220. You need to bend down a lot when replenishing water. On the other hand, by lifting the filler 202 to a relatively high position, the operator can reduce the amount of bending down when replenishing the urea water, which facilitates the replenishment of the urea water.

Further, as shown in FIG. 10, the filler 202 is displaced from the fuel gauge 161 provided at the upper right end of the front end surface of the fuel tank 160 in the left-right direction. As a result, as will be described later, an elevating step 220 that allows the fuel gauge 161 to be visually recognized from the front and diagonally above can be provided.

The fuel gauge 161 may be provided on the front end surface of the fuel tank 160, and may be provided at, for example, the upper left end portion or the upper end center portion. Also in this case, the filler 202 can be provided with an elevating step 220 in which the fuel gauge 161 can be visually recognized from the front and diagonally above by shifting the position of the filler 202 in the left-right direction from the fuel gauge 161. Further, instead of the fuel tank 160, a tank for storing other liquids, for example, a hydraulic oil tank (another example of the first storage tank) may be arranged adjacent to the rear of the urea water tank 200. Similar to the fuel gauge 161 of the fuel tank 160, a gauge indicating the liquid level of the hydraulic oil may be provided on the front end surface of the hydraulic oil tank. Also in this case, the filler 202 can be provided with an elevating step 220 in which the gauge can be visually recognized from the front and diagonally above by shifting the position of the filler 202 in the left-right direction from the gauge of the hydraulic oil tank. Hereinafter, the configuration, structure, etc. adopted to make the fuel gauge 161 visible to the user (operator, operator, etc.) are naturally adopted for the gauge of the tank for storing other liquids. Can be done. Further, instead of the urea water tank 200, a tank for storing other liquids, for example, a hydraulic oil tank (another example of the second storage tank) may be arranged adjacent to the front of the fuel tank 160. Similar to the urea water tank 200, a filler may be provided on the upper part of the hydraulic oil tank. Also in this case, the filler can be provided with an elevating step 220 in which the fuel gauge 161 can be visually recognized from the front and diagonally above by shifting the position of the filler in the left-right direction from the fuel gauge 161.

As shown in FIG. 9, the capacitor 19 is arranged on the swivel frame 140 (floor surface 143) adjacent to the front of the urea water tank 200. Hereinafter, an example of the fixed structure of the capacitor 19 will be described with reference to FIG.

FIG. 13 is a diagram showing an example of a fixed structure of the capacitor 19.

As shown in FIGS. 8 to 10 and 13, the capacitor 19 is housed inside a housing (hereinafter, referred to as a “capacitor housing”) 19H having a substantially rectangular parallelepiped outer shape. The capacitor housing 19H has flat plate-shaped mounting feet 19b extending forward and rearward at its four corners, and the mounting feet 19b are attached to the swivel frame 140 (floor surface 143) via the support portion 19M. It is fixed. Specifically, as shown in FIG. 13, the support portion 19M includes vibration damping rubbers 19Ma, 19Mb, washers 19Mc, 19Md, bolts 19Me, and nuts 19Mf. The laminated body in which the swivel frame 140 (floor surface 143), the damping rubber 19Mb, the washer 19Md, the mounting foot 19b, the washer 19Mc, and the damping rubber 19Ma are stacked in this order from the bottom has through holes in the vertical direction. It is fastened in the vertical direction by a bolt 19Me that inserts the through hole from the bottom to the top and a nut 19Mf that is fastened to the tip of the bolt 19Me.

The capacitor housing 19H has the same body shape as the excavator and the riff mag machine included in the work machine series according to the present embodiment. That is, the capacitor housing 19H is shared between the excavator and the riff mag machine. However, the configuration of the capacitor 19 (for example, the number of built-in capacitor cells, the specifications of each capacitor cell, etc.) may be the same or different between the excavator and the riff mag machine.

As shown in FIGS. 9 and 10, on the capacitor 19 (that is, the capacitor housing 19H), the upper surface 205A raised (that is, separated) from the floor surface 143 of the swivel frame 140 and the leg 205B A support member 205 is provided. The inverter 18 and the buck-boost converter 100 are arranged on the upper surface 205A of the support member 205. That is, the inverter 18 and the buck-boost converter 100 are arranged on the capacitor 19.

Further, as shown in FIG. 8, a work light 210 is arranged at the left front end portion of the upper surface 205A of the support member 205. The work light 210 can visually recognize the irradiation portion (the portion to be irradiated with light) from the outside through the slit portion 221F provided in the cover portion 221C described later.

As shown in FIGS. 8 and 10, the inverter 18 is housed in the inverter housing 18H and fixed to the upper surface 205A of the support member 205. Further, the buck-boost converter 100 is housed in a housing (hereinafter referred to as "converter housing") 100H and fixed to the upper surface 205A of the support member 205. Specifically, the inverter housing 18H and the converter housing 100H each have a substantially rectangular parallelepiped outer shape having substantially the same body shape. Then, the inverter housing 18H and the converter housing 100H are arranged side by side in the order of the inverter housing 18H and the converter housing 100H from the left, with the longitudinal directions of the respective outer shapes aligned in the front-rear direction, and the upper surface of the support member 205 is arranged. It is fixed to 205A.

The fixed structure of the inverter housing 18H and the converter housing 100H with respect to the support member 205 (upper surface 205A) may be the same as the fixed structure of the capacitor 19 shown in FIG. 10, or may be another structure.

Further, as shown in FIGS. 8 and 10, the inverter housing 18H and the converter housing 100H are arranged close to the left end of the upper surface 205A of the support member 205. Specifically, the converter housing 100H is arranged at the center of the upper surface 205A of the support member 205 in the left-right direction, and the inverter housing 18H is on the left side of the converter housing 100H on the upper surface 205A of the support member 205 (that is,). , Left end of top surface 205A). Then, at the left end of the upper surface 205A of the support member 205, a region 208a (see FIG. 14) on which other parts having the same body shape as the inverter housing 18H and the converter housing 100H can be arranged is provided. Parts specific to each work machine of the work machine series according to the present embodiment can be arranged in the area 208a of the upper surface 205A adjacent to the right side of the converter housing 100H. For example, in the area 208a, a housing (hereinafter referred to as “Rifmag driver housing”) 48H for accommodating the Rifmag driver 48 (see the dotted line frame in FIGS. 8 and 10), which is a component peculiar to the Rifmag machine, is provided. Can be placed.

Further, as shown in FIGS. 8 and 9, the inverter housing 18H, the converter housing 100H, and the riff mag driver housing 48H are arranged as close to the front end of the upper surface 205A of the support member 205. As a result, it is possible to secure a certain amount of front-rear distance between the rear ends of the inverter housing 18H, the converter housing 100H, and the riff mag driver housing 48H and the urea water tank 200. It becomes easier to handle the cooling pipe and the like. However, as described above, since the work light 210 is fixed to the left front end portion of the upper surface 205A of the support member 205, the front end position of the inverter housing 18H is the front end position of the converter housing 100H and the riff mag driver housing 48H. Behind. Hereinafter, the configurations of the support member 205 for fixing the inverter housing 18H, the converter housing 100H, and the riff mag driver housing 48H will be described with reference to FIG.

The inverter housing 18H is arranged on the right side of the converter housing 100H on the upper surface 205A of the support member 205, and a component (Rifmag driver housing 48H) peculiar to each work machine of the work machine series according to the present embodiment is on the left side. May be placed in. Further, the left and right positions of the inverter housing 18H and the converter housing 100H may be reversed. Further, the inverter housing 18H and the converter housing 100H are arranged at the left end portion or the right end portion of the upper surface 205A of the support member 205, and are parts unique to each work machine of the work machine series according to the present embodiment (Rifmag driver housing 48H). ) May be a structure that can be arranged at the center of the upper surface 205A in the left-right direction.

FIG. 14 is a perspective view showing an example of the support member 205.

As shown in FIG. 14, a fixing portion 209 for fixing the work light 210 is provided at the left front end portion of the upper surface 205A of the support member 205. The fixing portion 209 includes a region 209a in which the work light 210 is arranged and two fastening holes 209b in the front and rear positions. Then, a fixing portion 206 for fixing the inverter housing 18H is provided behind the fixing portion 209 at the left end portion of the upper surface 205A of the support member 205. The fixing portion 206 includes a region 206a in which the inverter housing 18H is arranged, and a total of four fastening holes 206b at two front locations and two rear locations.

Further, a fixing portion 207 for fixing the converter housing 100H is provided at the central portion of the upper surface 205A of the support member 205 in the left-right direction. The fixing portion 207 includes a region 207a in which the converter housing 100H is arranged, and a total of four fastening holes 207b at two front locations and two rear locations.

Further, at the right end of the upper surface 205A of the support member 205, a fixing portion 208 for fixing a component (rifmag driver housing 48H) peculiar to each work machine of the work machine series according to the present embodiment is provided. The fixing portion 208 includes a region 208a in which the component is arranged, and a total of four fastening holes 208b, two front and two rear.

As described above, in order to arrange the inverter housing 18H, the converter housing 100H, and the riff mag driver housing 48H as close to each other as possible, the fixing portions 207 and 208 are fixed portions 206.
It is provided closer to the front.

In this way, the inverter housing 18H and the converter housing 100H are arranged side by side on the upper surface 205A of the support member 205. Then, on the upper surface 205A of the support member 205, a fixing portion 208 capable of further arranging and fixing a part (Rifmag driver housing 48H) peculiar to each work machine of the work machine series according to the present embodiment is provided. As a result, the arrangement structure of the right front portion of the upper swing body 3 can be shared between the excavator and the riff mag machine included in the work machine series according to the present embodiment. Further, since the support member 205 has the same body shape (at least the dimensions in the left-right direction and the front-rear direction) between the excavator and the riff mag machine included in the work machine series according to the present embodiment, the parts of the support member 205. Can be shared. Further, the support member 205 is provided separately from a frame (house frame) (not shown) that constitutes the main house portion of the upper swing body 3. Therefore, the house frame can be shared between the excavator and the riff mug machine.

The converter housing 100H may be arranged at a location other than the upper surface 205A of the support member 205. That is, the fixed portion 207 of the upper surface 205A is omitted, the inverter housing 18H is fixed to the fixed portion 206 in the excavator, and the inverter housing 18H and the rifmag driver housing are fixed to the fixed portion 206 and the fixed portion 208 in the rifmag machine, respectively. The body 48H may be fixed. In this case, for example, in the work machine series according to the present embodiment, a small capacitor is adopted instead of the capacitor 19, and a small capacitor (a housing for accommodating) is used on the floor surface 143 below the upper surface 205A. The converter housing 100H may be arranged.

Returning to FIG. 8, the inverter 18 drives the motor generator 12 and the turning motor 21 using the electric power supplied from the capacitor 19 via the buck-boost converter 100. Therefore, the inverter 18, the motor generator 12, and the turning motor 21 are connected via the wire harness 31 and the wire harness 32, respectively. The outlets of the wire harnesses 31 and 32 in the inverter housing 18H (connectors connected to the wire harnesses 31 and 32) are in the longitudinal direction in the outer shape of the substantially rectangular parallelepiped of the inverter housing 18H (hereinafter, simply "the length of the inverter housing 18H"). It is provided on the side surface (that is, the rear end surface) of the rear end (referred to as "direction").

The inverter housing 18H has a connector for connecting a wire harness (not shown) with the buck-boost converter 100 on the rear end surface in the longitudinal direction, similarly to the connector for connecting the wire harnesses 31 and 32. Further, the buck-boost converter 100 has a connector for connecting the wire harness on the rear end surface in the longitudinal direction (hereinafter, simply referred to as "longitudinal direction of the converter housing 100H") in the outer shape of a substantially rectangular parallelepiped. Further, the buck-boost converter 100 has a connector on the rear end surface in the longitudinal direction for connecting a wire harness (not shown) to the capacitor 19. Further, the capacitor housing 19H has a connector on the rear end surface for connecting the wire harness.

As shown in FIG. 8, the wire harness 31 extending rearward from the inverter 18 is bent to the right in order to avoid interference with the rear urea water tank 200, and the front of the urea water tank 200 is directed from left to right. It is distributed in an extended manner. As shown in FIGS. 9 and 10, the wire harness 31 is bent downward at a position to the right of the right end of the urea water tank 200, and is below the floor surface 143 through a hole (not shown) provided in the floor surface 143. Penetrate into. The wire harness 31 penetrating under the floor surface 143 is bent rearward and is arranged along the inside of the side frame 142R so as to traverse the bottom of the fuel tank 160 from front to back. Then, the wire harness 31 penetrates above the floor surface 143 through a hole (not shown) provided in the floor surface 143 at a position rearward from the rear end of the fuel tank 160, is bent to the right side, and is bent to the right side. It is connected to the motor generator 12 arranged at the rear right side of the.

Further, the wire harness 32 extending rearward from the inverter 18 is bent to the left, straddling (or penetrating) the right frame 141R located on the left side of the urea water tank 200, and near the center of the upper swing body 3. It is connected to the turning electric motor 21 to be arranged.

Cooling water is supplied to the electric drive component from the radiator 192. The cooling water circulates in the cooling water passage (water jacket) provided in the inverter housing 18H, the converter housing 100H, and the capacitor housing 19H. Further, in the riff mag machine equipped with the riff mag driver 48, the cooling water further circulates the water jacket provided in the riff mag driver housing 48H. As a result, the inverter 18, the buck-boost converter 100, the capacitor 19, and the riff mag driver 48 can be cooled. Hereinafter, the cooling system of the electrically driven component will be described with reference to FIG.

FIG. 15 is a diagram showing an example of a cooling system for cooling the motor generator 12, the turning motor 21, and the electric drive parts.

The cooling system includes a radiator 192, a water pump 193, a cooling pipe 194, a reserve tank 195, and the like.

The water pump 193 sucks in and discharges the cooling water in the cooling system, that is, the cooling water in the cooling pipe 194 and the reserve tank 195, and circulates the cooling water in the cooling circuit composed of the cooling pipe 194. Specifically, as shown in FIG. 14, the water pump 193 sucks the cooling water cooled by the radiator 192 through the cooling pipe 194a and discharges it to the cooling pipe 194b.

The cooling water discharged by the water pump 193 is a cooling pipe arranged so as to be adjacent to each of the capacitor 19, the inverters 18A and 18B, the buck-boost converter 100, the turning motor 21, the motor generator 12, and the speed reducer 13. After passing through 194, it returns to radiator 192. Specifically, the cooling water discharged to the cooling pipe 194b by the water pump 193 is first supplied to the capacitor 19 (water jacket in the capacitor housing 19H) and then discharged to the cooling pipe 194c. A connecting portion 196 (for example, a fluid coupling or the like) capable of dividing the cooling water is connected to the cooling pipe 194c, and the cooling water of the cooling pipe 194c can be supplied in parallel to a plurality of devices. In this example, the connection portion 196 is configured so that the cooling water of the cooling pipe 194c can be divided into three cooling pipes 194d to 194f, of which the cooling pipe 194d is inside the inverters 18A and 18B (that is, inside the inverter housing 18H). The cooling pipe 194e is connected to the buck-boost converter 100 (that is, the water jacket in the converter housing 100H). Further, in the rifmag machine, the cooling pipe 194f is connected to the rifmag driver 48 (that is, the water jacket in the rifmag driver housing 48H). The cooling water that has passed through the inverter housing 18H and the converter housing 100H (in the riff mag machine, the cooling water that has passed through the inverter housing 18H, the converter housing 100H, and the rifmag driver housing 48H) rejoins at the connection portion 197. After that, it circulates in the order of the turning motor 21, the motor generator 12, and the speed reducer 13 through the cooling pipe 194, and returns to the radiator 192.

The configuration of the cooling circuit shown in FIG. 15 is an example, and any connection method may be adopted. For example, in FIG. 15, the water pump 193 may suck in the cooling water before being cooled by the radiator 192 and discharge it to the radiator 192. Further, the cooling pipes 194 are arranged in parallel in the portions adjacent to the inverters 18A and 18B and the buck-boost converter 100 (inverters 18A and 18B, the buck-boost converter 100 and the riff mug driver 48 in the riff mag machine), and the like. Although the parts are arranged in series, all of them may be arranged in series, and some or all of the other parts may be connected in parallel.

As shown in FIG. 8, the cooling pipe 194b extending from the water pump 193 arranged adjacent to the left side of the radiator 192 is vertically traversed under the radiator 192 in the front-rear direction and then bent to the right, and the radiator 191 is bent to the right. And the front of the diesel engine 11 is laid out in a manner of crossing from left to right. Then, the cooling pipe 194b is bent forward in front of the fuel tank 160, and is arranged along the fuel tank 160 and the urea water tank 200 in a manner of longitudinally traversing from the rear to the front, and is arranged on the rear end surface of the capacitor 19. Be connected. The connection portion 196 to which the cooling pipe 194c (not shown) extending from the rear end surface of the capacitor housing 19H is connected is arranged at a front-rear position between the urea water tank 200 and the inverter housing 18H and the converter housing 100H. To. The connection portion 196 and each of the inverter housing 18H and the converter housing 100H are connected by cooling pipes 194d and 194e. Further, in the rifmag machine, the connection portion 196 and the rifmag driver housing 48H are further connected by a cooling pipe 194f (dotted line in FIG. 8).

Although the connection portion 197 is not shown in FIG. 8, the arrangement mode of the connection portion 197, the connection portion 197, the inverter housing 18H and the converter housing 100H (in the case of a riff mag machine, the inverter housing 18H and the converter housing). The connection mode with the body 100H and the riff mag driver housing 48H) is the same as that of the connection portion 196.

As described above, the circulation path of the cooling system of the electric drive component has a cooling pipe 194d connected to the inverter housing 18H and a cooling pipe 194e arranged in parallel with the cooling pipe 194d and connected to the converter housing 100H. .. Then, it has a connecting portion 196 which is arranged in parallel with the cooling pipe 194d and the cooling pipe 194e and can connect the cooling pipe 194f connected to the riff mag driver housing 48H. As a result, the cooling system for the electric drive parts can be shared between the excavator and the riff mag machine included in the work machine series according to the present embodiment.

As shown in FIGS. 9, 11 and 12, various parts groups (urea water tank 200, inverter 18, capacitor 19, buck-boost converter 100, lift mug driver 48, work) are on the right front part of the upper swing body 3. The elevating step 220 is provided so as to cover the lamp 210 and the like). The elevating step 220 is provided so as to rise rearward, and the operator can ascend from the front of the upper swivel body 3 to the upper part of the house to inspect the engine room and the like. Further, the elevating step 220 is also provided with an opening (opening 223B) for accessing the filler 202 of the urea water tank 200, which will be described later, so that the operator can climb the elevating step 220 and fill the urea water tank 200 with urea water. Can be replenished. The elevating step 220 includes a first step 221 and a second step 222, and a third step 223 from the bottom.

As shown in FIGS. 11 and 12, a handrail 225 is provided at the right end of the elevating step 220. An exterior cover 230 is attached to the outside (right end) of the elevating step 220. That is, the exterior cover 230 covers various parts on the right front side of the upper swing body 3 from the right side. Further, an inner cover 240 is attached to the inside (left end portion) of the elevating step 220. That is, the inner cover 240 covers various parts in the front right side of the upper swing body 3 from the left side.

As shown in FIG. 9, the first stage step 221 includes a first stage step main body 221A that covers the electrically driven components (inverter housing 18H, capacitor housing 19H, converter housing 100H, rifmag driver housing 48H). The first stage step main body 221A is provided with an opening 221B on the front end surface.

The opening 221B is provided for the operator to maintain the electrically driven parts and the work light 210 housed in the first stage step 221. For example, as shown in FIG. 10, the capacitor housing 19H is provided with a safety switch cover 19s. Since the capacitor 19 can output a very high voltage, it is necessary to remove the safety switch cover 19s and cut off the power path by the safety switch when performing maintenance of the electric drive system including the capacitor 19. Further, the work light 210 needs to be replaced when the light bulb does not light due to the life or the like. At that time, the operator can access both the safety switch cover 19s and the work light through the opening 221B (dotted line frame in FIG. 10). Therefore, it is possible to suppress an increase in cost as compared with the case where the cover for maintenance of the electric drive component and the cover for maintenance of the work light 210 are separately provided.

Further, as shown in FIG. 7, the opening 221B is provided so that the maintenance target portion (safety switch cover 19s) of the capacitor 19 and the maintenance target portion (irradiation portion) of the work light can be visually recognized from the front. Be done. Therefore, the operator can easily perform maintenance on both the electric drive component and the work light 210.

The opening 221B only needs to be accessible to the maintenance target part (safety switch cover 19s) of the capacitor 19 and the maintenance target part (irradiation part) of the work light 210, and each maintenance target part cannot be visually recognized from the front. It is also good. That is, the opening 221B may be provided in such a manner that any one of the maintenance target parts can be visually recognized from the front, or all of them may be provided in an invisible manner.

Further, the first step step 221 includes a cover portion 221C that covers the opening 221B from the front. The cover portion 221C is configured to be removable from the first step 221 (see the white arrow in FIG. 9), and the opening 221B is provided in addition to the front end surface of the first step main body 221A provided with the opening 221B. It is provided so as to cover the upper surface that is not provided. That is, the cover portion 221C overlaps the upper surface (the portion on which the operator puts his / her feet) of the first step step 221 (specifically, the first step step main body 221A). As a result, the upper surface of the first step main body 221A and the upper surface of the cover portion 221C can support the load from above, so that the thickness of the first step main body 221A and the thickness of the cover portion 221C can be changed. Can be thinned. Therefore, the weight of the first stage step main body 221A can be reduced, and the load on the operator in the assembly process can be reduced. Further, the weight of the cover portion 221C can be reduced, the burden on the operator in the assembly process can be reduced, and the burden on the operator in the maintenance work can be reduced. The weight of the cover portion 221C has a mass of not more than a predetermined value that can be carried by the operator, for example, a mass of 15 kg or less.

Further, as described above, the inverter 18 and the buck-boost converter 100 are housed in different inverter housings 18H and converter housing 100H, respectively, and are arranged side by side. Further, as described above, in the rifmag machine, the inverter 18, the buck-boost converter 100, and the rifmag driver 48 are housed in different inverter housings 18H, converter housing 100H, and rifmag driver housing 48H, respectively, and then left and right. Arranged side by side. As a result, the height of the electric drive component as a whole can be kept relatively low, so that the height of the portion of the elevating step 220 that covers the electric drive component can be kept low. Therefore, for example, the step of the portion covering the electrically driven component becomes high, and there is no need to add a step having a short front-rear dimension to the front portion of the step, and the portion covering the electrically driven component is used as the first step 221. can do. That is, the elevating step 220 can be easily ascended and lowered. Further, by adopting a configuration in which the inverter housing 18H, the converter housing 100H, and the riff mag driver housing 48H can be arranged side by side on the upper surface 205A of the support member 205, the same good upper part of the house is used for both the excavator and the rifmag machine. It is possible to realize the ease of getting on and off the vehicle.

The cover portion 221C is provided in a removable manner, but may be provided in a rotatable manner with the rear end portion as the center of rotation, for example, as in the cover portions 222C and 223C described later.

Further, as shown in FIGS. 11 and 12, the cover portion 221C is provided with a slit portion 221F. As shown in FIG. 12, the slit portion 221F is provided so as to be in the same vertical and horizontal directions as the work light 210 with the cover portion 221C attached to the first stage step main body 221A. That is, with the cover portion 221C attached to the first stage step main body 221A, the irradiation portion of the work light 210 can be visually recognized from the front through the slit portion 221F.

The slit portion 221F for passing the light from the irradiation portion of the work light 210 forward is provided at the upper end of the front end surface of the first step 221 (specifically, the cover portion 221C). That is, the work light 210 is provided on the upper surface 205A of the support member 205 raised from the floor surface 143 on which the capacitor housing 19H is arranged. Therefore, it is possible to make it difficult for the light emitted forward from the slit portion 221F to be blocked by the step 145 provided at the front end portion of the swivel frame 140, and the work light 210 can reliably irradiate the ground in front of the excavator. it can. Further, since the work light 210 is provided at the left front end portion of the upper surface 205A of the support member 205, it is possible to illuminate the portion of the support member 205 near the boom 4 in front of the work machine. Therefore, it is possible to reliably irradiate the place where the work is actually performed.

Further, the slit portion 221F is configured so that the operator can grasp it by, for example, attaching a protective material to the end portion. As a result, it is not necessary to provide the cover portion 221C with a dedicated grip portion, and it is possible to suppress an increase in cost, an increase in mass, and the like.

Further, as shown in FIG. 11, the cover portion 221C has a curved surface shape having a curvature similar to the curved surface shape of the exterior cover 230 adjacent to the right side. As a result, it is possible to produce a sense of unity in terms of design between the exterior cover 230 and the cover portion 221C.

As shown in FIG. 11, a footrest portion 221D having a non-slip function is provided on the upper surface of the cover portion 221C.

As shown in FIG. 9, the second stage step 222 includes a work box 222A arranged at the rear of the upper surface of the first stage step main body 221A. That is, the elevating step 220 uses the work box 222A as the second step 222. The work box 222A is used, for example, for accommodating a grease pail, an electric pump, an automatic lubricator including a grease gun, a tool, and the like.

The work box 222A includes an opening 222B from the front end surface to the upper surface, and also includes a cover portion 222C that covers the opening 222B. As shown in FIG. 9, the cover portion 222C is provided so as to be rotatable around the rear end portion. As a result, the operator can rotate the cover portion 222C upward to access the contents in the work box 222A from the opening 222B.

As shown in FIG. 11, a footrest portion 222D having a non-slip function is provided on the upper surface of the cover portion 222C.

As shown in FIG. 9, the third step step 223 includes a urea water tank 200, a filler pipe 201, and a third step main body 223A that covers the filler 202 from the front and above. The third step main body 223A includes an opening 223B from the upper surface to the front surface (specifically, a portion of the front surface higher than the second step 222) and also includes a cover portion 223C that covers the opening 223B. As shown in FIG. 9, the cover portion 223C is rotatably provided around the rear end portion.

A footrest portion 223D having a non-slip function is provided on the upper surface of the third step step 223 (cover portion 223C).

As shown in FIG. 9, the opening 223B is provided in the front-rear direction so as to overlap the position where the filler 202 is arranged. Further, although not shown, the opening 223B is provided in the left-right direction so as to overlap the position where the filler 202 is arranged. As a result, the operator can rotate the cover portion 223C upward and access the filler 202 from the opening 223B to replenish the urea water tank 200 with urea water.

Further, as shown in FIG. 9, the filler 202 is provided so as to be higher than the upper surface of the second step step 222 (work box 222A). Therefore, when the operator replenishes the urea water tank 200 with the urea water from the first step 221 or the second step 222, the operator does not have to bend down greatly and the urea water can be easily replenished.

Further, as described above, since the filler 202 is displaced from the fuel gauge 161 in the left-right direction, as shown in FIG. 11, the filler 202 is in the same height position as the fuel gauge 161 in the third step step 223 (specifically). The right end of the third step main body 223A) is on the left side of the left and right positions of the fuel gauge 161. That is, the third step step 223 (third step step main body 223A) is arranged closer to the left side than the fuel gauge 161 and allows the fuel gauge 161 to pass through the space between the third step step 223 and the exterior cover 230. It can be visually recognized from the front.

As described above, the fuel gauge 161 (or the gauge of the tank for storing other liquids) may be provided, for example, at the upper left end portion or the upper end center portion of the fuel tank 160. In this case, the third step step 223 (third step step main body 223A) may be arranged closer to the right side or divided into left and right at the center so as not to block the viewing space in front of the fuel gauge 161. It may be the same mode. Further, the fuel gauge 161 may be provided at a height corresponding to steps other than the third step step 223 (first step step 221 and second step step 222), and may be provided to indicate the fuel liquid level. The range may extend to a height corresponding to a step other than the third step 223 (first step 221 and second step 222). In these cases as well, as in the case of the third step step 223 (third step step main body 223A), the other steps are moved to either the left or right side so as not to block the visible space in front of the fuel gauge 161. It may be arranged in such a way that it is divided into left and right at the central portion.

Further, as shown in FIGS. 11 and 12, a scaffolding member 224 having the same height as the upper surface of the third step 223 is provided at the right end of the third step main body 223A. The scaffolding member 224 is provided so as to cover the space between the third step main body 223A and the exterior cover 230 from above. Therefore, by providing a space between the third step main body 223A and the exterior cover 230, it is possible to prevent inconveniences such as a narrow width on which the operator's feet are placed. That is, by providing the scaffolding member 224, it is possible to prevent a decrease in convenience when the operator uses the elevating step 220.

Further, as shown in FIG. 11B, the scaffolding member 224 is provided with a slit portion in the front-rear direction so that the scaffolding member 224 can be visually recognized from above to below through the slit portion. .. Therefore, the operator can visually recognize the fuel gauge 161 from diagonally above through the slit portion and the space between the third step main body 223A and the exterior cover 230.

Further, as shown in FIG. 12, the scaffolding member 224 extends to the right from the upper end of the right side surface of the third step main body 223A. That is, the scaffolding member 224 is fixed to the upper end of the right side surface of the third step main body 223A. Therefore, it is possible to prevent the situation where the fixed structure of the scaffolding member 224 blocks the front of the fuel gauge 161 and ensure the visibility of the fuel gauge 161 (specifically, the visibility from the front).

Further, as shown in FIG. 12, in order to secure the strength of the joint portion between the scaffolding member 224 and the right side surface of the third step main body 223A, the thickness (vertical dimension) of the scaffolding member 224 is set to the third. It is set so that it becomes larger as it approaches the step main body 223A. That is, the thickness of the scaffolding member at the joint portion with the third step main body 223A is set to be relatively large in order to secure the joint strength.

The scaffolding member 224 may be provided with a transparent portion in which the fuel gauge 161 can be visually recognized from diagonally above, instead of the slit portion. Further, as described above, the fuel gauge 161 may be provided at, for example, the upper left end portion or the upper end center portion of the fuel tank 160, and the third step step 223 (third step step main body 223A) is also provided. In order not to block the visible space in front of the fuel gauge 161, for example, the fuel gauge 161 may be arranged closer to the right side, or may be divided into left and right at the central portion. Further, as described above, the fuel gauge 161 may be provided at a height corresponding to a step other than the third step step 223, and the display range indicating the fuel liquid level is other than the third step step 223. It may be an aspect over a height corresponding to another step. Also in these cases, the scaffolding member 224 may be fixed to the third step step 223 (third step step main body 223A) or another step in such a manner that the scaffold member 224 is arranged on the visual space in front of the fuel gauge 161. ..

Further, in the examples shown in FIGS. 11 and 12, the space adjacent to the third step main body 223A in front of the fuel gauge 161 (the space between the third step main body 223A and the exterior cover 230) is above the space. The scaffolding member 224 is arranged in a manner in which the fuel gauge 161 is visible, but instead of the scaffolding member 224, another member may be arranged in a manner in which the fuel gauge 161 is visible, for example, one of the handrails 225. The unit may be arranged on the space. Hereinafter, the other example of the handrail 225 will be described with reference to FIGS. 16 to 18.

16 to 18 are a front view, a side view, and a plan view showing another example of the handrail 225.

As shown in FIGS. 16 to 18, the handrail 225 is provided in a rearward rising manner in accordance with the inclination of the elevating step 220. The handrail 225 is mainly composed of a pipe material (for example, a pipe-shaped steel pipe), and includes a main body portion 225A and a reinforcing portion 225B. Further, the main body portion 225A includes a handle portion 225Aa which is a portion gripped by an operator when climbing the elevating step 220, an upper base portion 225Ab which supports the handle portion 225Aa on the upper stage side of the elevating step 220, and a handle portion 225Aa. Includes a lower base 225Ac that supports the elevating step 220 on the lower side.

As shown in FIG. 17, the height of the handle portion 225Aa from the upper surface of each step of the elevating step 220 is a predetermined height (range) set so that the operator can easily grip the handle portion 225Aa. As described above, it has a pipe shape provided at a constant inclination in the rearward ascending along the inclination of the elevating step 220. Further, as shown in FIGS. 16 and 18, the handle portion 225Aa is provided with a front end portion relatively outside (right end portion) of the elevating step 220 in front view and plan view, and is provided from the front to the back. It is extended in the front-rear direction so as to incline inward (left side) of the elevating step 220. As a result, when the user climbs the elevating step 220, the frontage looks wide, and when the user descends, the point of view is widened and visually recognized. Therefore, the elevating step 220 is provided at the right end portion. It is possible to suppress the feeling of oppression of the user when moving up and down. Further, since the handle portion 225Aa is provided so as to be inclined inward (left side) from the front to the rear, a part thereof (the portion P surrounded by the dotted line in FIG. 18) is a third portion as shown in FIG. It is arranged on the space between the step main body 223A and the exterior cover 230. As a result, the operator can be urged not to step into the space between the third step main body 223A and the exterior cover 230 by visually recognizing the presence of the handle portion 225Aa. The rear end (upper end) of the handle portion 225Aa is connected (connected) to the upper end of the upper base portion 225Ab, and the front end (lower end) thereof is connected (connected) to the lower end of the lower base portion 225Ac. That is, the handle portion 225Aa is connected between the upper end of the lower base portion 225Ac and the upper end of the upper base portion 225Ab so as to extend rearward.

The handle portion 225Aa may be extended in the front-rear direction while maintaining the position in the left-right direction from the front end portion provided on the relatively outer side (right side) of the elevating step 220. As a result, it is possible to further suppress the feeling of oppression when the elevating step 220 is elevated and lowered.

The upper base portion 225Ab is fixed to the upper part of the house, specifically, the upper surface of the fuel tank 160, extends upward from the fixed portion, and is connected (connected) to the rear end (upper end) of the handle portion 225Aa at the upper end. Has a pipe shape to be used.

The lower base portion 225Ac is fixed on the swivel frame 140, extends forward from the fixed portion, then bends upward, extends upward, and at the upper end, the front end (lower end) of the handle portion 225Aa and (lower end). It has a pipe shape to be connected).

The reinforcing portion 225B (an example of the auxiliary portion) has one end at an intermediate position between the upper base portion 225Ab and the lower base portion 225Ac of the handle portion 225Aa (in this example, near the front-rear position where the first step 221 is provided). , Has a pipe shape extending with the upper end of the house (specifically, the upper portion of the fuel tank 160 adjacent to the fixed portion of the upper base portion 225Ab) as the other end. As a result, it is possible to suppress the tilting of the main body 225A in the left-right direction due to an external force from an operator or the like. Further, as shown in FIG. 18, the reinforcing portion 225B is bent to the right side in the left-right direction from the handle portion 225Aa in the extending direction and then bends to approach the handle portion 225Aa when viewed in a plan view. It has a bent shape of an aspect. As a result, the rigidity for preventing the main body portion 225A from tilting in the left-right direction can be further increased. Further, since the bent shape is formed on the right side in the direction away from the elevating step 220, the convenience can be maintained without disturbing the user (operator, operator, etc.) who uses the elevating step 220. Further, as shown in FIG. 18, a part of the reinforcing portion 225B (the portion P surrounded by the dotted line in FIG. 18) is arranged on the space between the third step main body 223A and the exterior cover 230. .. As a result, the operator can visually recognize the presence of the reinforcing portion 225B and urge the user not to step into the space between the third step main body 223A and the exterior cover 230. .. Further, since the other end of the reinforcing portion 225B is fixed to the upper surface of the fuel tank 160 at substantially the same vertical position (height) as the upper surface of the third step main body 223A, the third stage step main body 223A and the exterior cover 230 The portion above the space between the two is relatively close to the upper surface of the third step main body 223A in the vertical direction. As a result, when the operator tries to step into the space between the third step main body 223A and the exterior cover 230 from above, the reinforcing portion 225B can function as a scaffold. Further, tentatively, the worker's feet can be seen from the vertical gap between the reinforcing portion 225B and the upper surface of the third step main body 223A and the reinforcing portion 225B, and the space between the third step main body 223A and the exterior cover 230. Even if an attempt is made to enter, the portion below the operator's knee comes into contact with the reinforcing portion 225B, so that the user can be urged not to step further. Further, since the reinforcing portion 225B does not cover the space between the third step main body 223A and the exterior cover 230, the user can visually recognize the fuel gauge 161 from diagonally above while ascending and descending the elevating step 220. it can.

In the present embodiment, the portion of the handle portion 225Aa and the reinforcing portion 225B that branches downward from the handle portion 225Aa is arranged on the space between the third step main body 223A and the exterior cover 230. Is a mode in which the elevating step 220 is inclined inward (left side) at the same angle from the front to the rear, and is extended in the front-rear direction. However, as described above, the handle portion 225Aa is the elevating step 220. It is configured to extend in the front-rear direction while maintaining the relatively outer left and right positions, and only the reinforcing portion 225B may be arranged on the space between the third step main body 223A and the exterior cover 230. That is, the handle portion 225Aa is provided outside the elevating step 220 with respect to the reinforcing portion 225B at the left and right positions where there is a space between the third step main body 223A and the exterior cover 230. As a result, the user is urged not to step into the space between the third step main body 223A and the exterior cover 230 while suppressing the feeling of oppression of the user when ascending and descending the elevating step 220. it can.

In this way, by arranging a part of the handrail 225 on the space between the third step main body 223A and the exterior cover 230 instead of the scaffolding member 224, the work is similar to the case where the scaffolding member 224 is provided. It is possible to prevent a decrease in convenience when a person uses the elevating step 220.

As described above, the fuel gauge 161 may be provided at the upper left end of the fuel tank 160, for example, and the third step step 223 (third step step main body 223A) is in front of the fuel gauge 161. For example, it may be arranged close to the right side so as not to block the viewing space of. In this case, the handrail 225 may be provided at the left end portion (end portion on the boom 4 side) of the elevating step 220. Then, the main body portion 225A (handle portion 225Aa) and the reinforcing portion 225B of the handrail 225 suppress the feeling of oppression of the user when ascending and descending the elevating step 220, and are on the left side of the third step step main body 223A. It suffices to have an arrangement structure similar to that of the present embodiment, which can prompt the user not to step into the space for visually recognizing the adjacent fuel gauge 161.

Although the embodiments for carrying out the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various aspects are within the scope of the gist of the present invention described in the claims. Can be transformed / changed.

1 Lower traveling body 1A, 1B Hydraulic motor 2 Swing mechanism 3 Upper swivel body (swivel body)
4 Boom 5 Arm 6 Bucket 6A Lifting Magnet 6M Electromagnetic Coil 7 Boom Cylinder 8 Arm Cylinder 9 Bucket Cylinder 10 Cabin 11 Diesel Engine 12 Motor Motor 13 Reducer 14 Main Pump 15 Pilot Pump 16 High Pressure Hydraulic Line 17 Control Valve 18, 18A, 18B Inverter 18H Housing 19 Capacitor 19b Mounting foot 19H Housing 19M Support 19s Safety switch cover 21 Swivel motor 22 Resolver 23 Mechanical brake 24 Swivel 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 32 Wire harness 42 Suction switch 44 Release switch 48 Rifmag driver 48H chassis 69 Urea water supply piping 100 Lifting pressure converter 100H chassis 110 DC bus 111 DC bus voltage detector 112 Capacitor voltage detector 113 Capacitor current detector 120 Power storage system 140 Swing frame 141 Center frame 141L Left frame 141R Right frame 142, 142L, 142R Side frame 143 Floor surface 145 Step 150 Exhaust gas treatment device 160 Fuel tank (first storage tank)
161 Fuel gauge (gauge)
190 Cooling unit 191 Radiator 192 Radiator 193 Water pump 194 Cooling pipe 194a to 194c Cooling pipe 194d Cooling pipe 194e Cooling pipe 194f Cooling pipe 195 Reserve tank 196, 197 Connection part 200 Urea water tank (second storage tank)
201 Filler pipe 202 Filler 205 Support member 205A Top surface 206 Fixed part 206a Area 206b Fastening hole 207 Fixed part 207a Area 207b Fastening hole 208 Fixed part 208a Area 208b Fastening hole 209 Fixed part 209a Area 209b Fastening hole 210 Work light 220 1st step 221A 1st step body 221B Opening 221C Cover part 221D Foot rest 221F Slit part 222 2nd step Step 222A Work box 222B Opening 222C Cover part 222D Foot rest 223 3rd step Step 223A 3rd step Body 223B Opening 223C Cover 223D Footrest 224 Scaffolding member (predetermined member)
225 handrail (predetermined member)
225A Main body 225Aa Handle 225Ab Upper base 225Ac Lower base 225B Reinforcement (auxiliary)
230 exterior cover 240 inside cover

Claims (12)

With a swivel body
An ascending / descending step provided on the right front portion of the swivel body and including a plurality of step portions as a scaffolding for the user and a plurality of step portions connecting adjacent step portions among the plurality of step portions.
A first storage tank mounted adjacent to the rear of the elevating step of the swivel body,
A gauge indicating the liquid level, which is provided on the front end surface of the first storage tank, is provided.
One of the plurality of step portions adjacent to the first storage tank is arranged at a position higher than the gauge so as to avoid a position in the left-right direction in which the gauge is provided.
A predetermined member is arranged in front of the gauge and on a space adjacent to the one step portion in the left-right direction so that the gauge can be visually recognized through the space.
Excavator. The one step portion is arranged closer to the left or right than the gauge.
The excavator according to claim 1. The one step portion is provided so as to cover the upper part of the second storage tank different from the first storage tank.
The filler of the second storage tank is installed so as to be offset from the position in the left-right direction of the gauge.
The excavator according to claim 1 or 2. Diesel engine and
An exhaust gas treatment device for purifying the exhaust gas of the diesel engine using a treatment agent is provided.
The first storage tank stores the fuel of the diesel engine.
The second storage tank stores the treatment agent.
The excavator according to claim 3. The predetermined member is a scaffolding member whose gauge can be visually recognized through the space.
The excavator according to any one of claims 1 to 4. The scaffolding member has a slit portion, and the gauge can be visually recognized from diagonally above through the slit portion.
The excavator according to claim 5. The scaffolding member has a transparent portion, and the gauge can be visually recognized from diagonally above through the transparent portion.
The excavator according to claim 5. The predetermined member is a handrail member provided along the elevating step in a manner in which a part thereof is arranged on the space.
The excavator according to any one of claims 1 to 4. The handrail member includes a handle portion that connects a lower base portion, an upper base portion, and an upper end of the lower base portion and an upper end of the upper base portion in a rearwardly extending manner, and a handle portion. Includes a reinforcing portion that extends above the space, with the intermediate position between the lower base and the upper base as one end and the upper part of the house as the other end.
The excavator according to claim 8. The reinforcing portion has a bent shape in a manner in which the reinforcing portion is bent in the left-right direction away from the handle portion in the extending direction and then approaches the handle portion when viewed in a plan view.
The excavator according to claim 9. The handle portion is extended in the front-rear direction in a manner in which the handle portion is inclined inward of the elevating step from the front to the back.
The excavator according to claim 9 or 10. The handle portion is extended in the front-rear direction while maintaining the same left-right position, and is provided outside the elevating step at the front-rear position of the space.
The excavator according to claim 9 or 10.

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