Hitachi Construction Machinery Patente

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Provided is an electrically driven work machine including a battery, an electrically driven motor that uses electric power of the battery as a driving source, a hydraulic pump that is driven by the electrically driven motor and that pumps a hydraulic operating fluid into a hydraulic actuator, a hydraulic operating fluid cooling circuit having an oil cooler that cools the hydraulic operating fluid, a cooling refrigerant circuit that circulates a cooling refrigerant, and a battery temperature adjusting circuit that circulates a heat medium that adjusts a temperature of the battery, the battery temperature adjusting circuit having an electric heater that heats the heat medium, a battery cooling heat exchanger that cools the heat medium by making the heat medium exchange heat with the cooling refrigerant circulating through the cooling refrigerant circuit, and a battery warming-up heat exchanger that heats the heat medium by making the heat medium exchange heat with the hydraulic operating fluid flowing through the hydraulic operating fluid cooling circuit.

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Provided is a work machine capable of achieving significant increases and decreases in engine rotational speed and easy fine adjustment thereof. The work machine includes: a power device that drives rotation; a work device that operates using the power device as a power source; and an instruction device that instructs an increase and a decrease in rotational speed of the power device. The instruction device includes a first instruction device and a second instruction device. A minimum change unit of the rotational speed of the power device that can be instructed by the first instruction device is different from a minimum change unit of the rotational speed of the power device that can be instructed by the second instruction device.

A power control system 1 is provided, which includes: a surrounding camera 510 for detecting an object in a periphery of a power cable 200 which supplies electric power to an electric shovel 100 operated by the electric power and an object detection computation-unit 520 which limits the electric power to be supplied to the electric shovel 100, when a distance between the object detected by the surrounding camera 510 and the power cable 200 falls within a range determined in advance. As a result, a power control system and a power control method which can suppress contact of the object with the power cable and allow the working machine to be operated more safely can be provided.

Provided are an operation device and a work machine provided with the same, the operation device being capable of instantly adjusting an audio player sound volume even when the audio player sound volume sounds quite or loud as a result of adjusting an engine speed during audio playback, or capable of instantly adjusting an air conditioner air volume even when it is desired to suppress engine power loss or to improve fuel efficiency by reducing an air volume of an air conditioner as a result of adjusting an engine speed during operation of the air conditioner. In the operation device in which an engine speed adjustment function and an audio player sound volume adjustment function are exclusively assigned to a rotation operation of a dial, in a state in which the engine speed adjustment function is assigned to the rotation operation of the dial, the assignment of the rotation operation of the dial is switched to the audio player sound volume adjustment function by tilting the dial in one direction. In a state where the audio player sound volume adjustment function is assigned to the rotation operation of the dial, the assignment of the rotation operation of the dial is switched to the engine speed adjustment function by tilting the dial in a direction opposite to that when the assignment of the rotation operation of the dial is switched from the engine speed adjustment function to the audio player sound volume adjustment function.

For example, in a work machine equipped with an input device that can selectively assign plurality functions, provide a work machine that can present information indicating the current function assignment without misidentifying the assigned functions and without reducing the visibility of other display information during operation. In a work machine equipped with an input device that can selectively assign any of plurality functions, and a display that shows either a first display screen containing the current function assignment information of the input device or a second display screen that does not contain the current function assignment information of the input device, the controller, when the first display screen is shown on the display and the input device is operated, executes processing according to the current function assignment of the input device. When the second display screen is shown on the display and the input device is operated, it does not execute processing according to the current function assignment of the input device, but instead controls the display to switch the display screen from the second display screen to the first display screen.

The work machine includes a vehicle body, a camera for capturing the surroundings of the vehicle body, a monitor for displaying the camera image photographed by the camera, a monitor operation device for instructing changes in the display magnification of the camera image displayed on the monitor, and a controller for controlling the display of the monitor in response to the operation of the monitor operation device. The controller notifies the operator of caution or disables the change in display magnification instructed by the monitor operation device when the display magnification instructed by the monitor operation device is outside the predetermined magnification range and predetermined operating conditions are met before the operation of the vehicle body. This suppresses the deficiency of the area displayed on the monitor relative to the proper display target area during operation.

The work machine such as the electric excavator 100 of the present invention includes a vehicle body with a working device, an AC/DC converter 111 installed on the vehicle body to receive power from the grid power supply 400, and a high voltage battery 112 attached to the vehicle body, and operates by power received from the grid power supply 400 and the high voltage battery 112 through the AC/DC converter 111. Furthermore, the work machine includes a first data transmission/reception 125 that receives information output by an external device, the server 500, and a vehicle controller 120 that sets the power received from the grid power supply 400 based on the information received by the first data transmission/reception 125. This provides a work machine, electric power control method, and electric power control system that can more appropriately distribute the power obtained from the grid power supply to the work machine, achieving both a reduction in the load on the grid power supply and improved work efficiency at the work site.

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A speed-changing device (21) is provided with an input shaft (22), an output shaft (23), a planetary stepless speed-changing mechanism (24), a multistage speed-changing mechanism (26) and a controller (25). The multistage speed-changing mechanism (26) is provided with a forward rotation mode in which a forward one-speed clutch (69) is connected and a reverse rotation mode in which a backward one-speed clutch (70) is connected. The controller (25) starts the switch from an engagement state to a disengagement state of the forward one-speed clutch (69) and starts the switch from a disengagement state to an engagement state of the backward one-speed clutch (70) when rotation of the output shaft (23) is in a forward rotation state (forward state) at the switching from the forward rotation mode to the reverse rotation mode.

A speed-changing device (21) is provided with an input shaft (22), an output shaft (23), a planetary stepless speed-changing mechanism (24), a direct joint mechanism (27), an idler element (28), a multistage speed-changing mechanism (26) and a controller (25). The controller (25) controls a rotation speed of a first variator (33) in the planetary stepless speed-changing mechanism (24) and engagement/disengagement of a first clutch (27C) in the direct joint mechanism (27). The controller (25) can switch the speed-changing device (21) to three power transmission states composed of a first power transmission state (stepless speed change), a second power transmission state (internal lockup) and a third power transmission state (external lockup).

The battery (25) mounted on the vehicle body frame (5) is positioned at the front side part of the vehicle body frame (5), and the DC/DC converter (29) is located between the front wheel (3) and the rear wheel (4) and is positioned on the lateral side of the vehicle body frame (5). The boost reactor (26) is positioned on the rear side of the battery (25) in a state facing the battery (25) in the longitudinal direction, the hydraulic pump drive motor (27) is positioned on the rear side of the boost reactor (26), and the pump drive inverter (28) is positioned on the rear side of the hydraulic pump drive motor (27).

The dump truck (1) is equipped with a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an electric motor (25) to drive the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) to supply power to the electric motor (25), and electrical device including a converter (34) arranged on the rear side of the battery device (26) . Below the battery device (26), a first refrigerant line (45) through which refrigerant flows to cool the battery device (26) and a second refrigerant line (54) through which refrigerant flows to cool the electrical device are arranged.

The vehicle body frame (2) consists of a left frame (2A) and a right frame (2B) extending in the longitudinal direction, a left pillar (2C) extending upwards from the left frame (2A), a right pillar (2D) extending upwards from the right frame (2B), and a beam (2E) extending in the lateral direction and attached across the upper parts of the left pillar (2C) and the right pillar (2D). The battery device (11) is arranged between the left pillar (2C) and the right pillar (2D) with a plurality of battery modules (12). In the plurality of battery modules (12), one end side in the longitudinal direction becomes the electrical wiring connection part (12A) for connecting electrical wirings (15), and the other end side in the longitudinal direction becomes the temperature control liquid pipe connection part (12B) for connecting temperature control liquid pipes (16).

The battery device (26) mounted on the vehicle body frame (5) is composed of a multi-stage battery frame (27) having vertically stacked first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31), and a plurality of battery modules (35) that are detachably attached to each of these first support frame body (28), second support frame body (29), third support frame body (30), fourth support frame body (31).

The present invention aims to provide a hydraulic drive system capable of improving the operability of a hydraulic actuator by suppressing shock when switching from the state where the hydraulic pump accumulates in the accumulator to the state where the hydraulic pump drives the hydraulic actuator. Therefore, when the detection value of the first pressure sensor falls below a predetermined first threshold without an operation signal being input, the controller communicates the hydraulic pump to the accumulator while interrupting the hydraulic pump and hydraulic actuator and interrupting the hydraulic pump and tank. When an operation signal is input while pressure oil is being supplied from the hydraulic pump to the accumulator, the controller reduces the opening of the accumulator flow control valve and communicates the hydraulic pump to the tank while interrupting the hydraulic pump and the hydraulic actuator. Then, after a predetermined time has elapsed or after the pressure of the hydraulic pump has decreased, the controller communicates the hydraulic pump and the hydraulic actuator.

The dump truck (1) includes a vehicle body frame (5) to which front wheels (3) and rear wheels (4) are attached, an travel electric motor (25) driving the rear wheels (4), a battery device (26) mounted on the vehicle body frame (5) supplying electric power to the travel electric motor (25), and electrical equipment including a converter (34) arranged on the rear side of the battery device (26). The battery device (26) is configured to include a battery frame (27) supported by the vehicle body frame (5) and a battery module (33) attached to the battery frame (27). The battery frame (27) is formed with a refrigerant pipe housing section (32) housing a first refrigerant pipe (45) through which refrigerant cooling the battery module (33) flows, and a second refrigerant pipe (50) through which refrigerant cooling the electrical equipment flows.

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A work machine includes a body (1, 2) and a front work implement (3) equipped with a bucket (7), and the front work implement includes a thumb attachment (8) that cooperates with the bucket to hold an object. The work machine includes a hydraulic pump (19, 20), a bucket cylinder (11), a thumb cylinder (12), a bucket operation device (14), a bucket directional control valve (21), a thumb attachment operation device (15), a thumb attachment directional control valve (22), and a controller (13). The controller controls the thumb attachment directional control valve so that the operation of the thumb attachment is linked to the operation of the bucket only while the operation signal of the bucket is being input by the bucket operation device, when the automatic mode in which the operation of the thumb attachment is automatically controlled is set.

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