JPH11140906A - Battery-powder hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate troubles involved in the opening and closing of a battery cover above a battery while it is charged and simplify the battery cover by providing an electric fan to discharge out toxic gasses generated when the battery is charged. SOLUTION: An electric fan 3 cools an electric motor 10 and an oil cooler 2 and discharges toxic gasses generated from a battery 12 when it is charged. Air from the electric fan 3 in a cover flows in the direction of the arrow. A hydraulic oil tank 8 that must be cooled during operation, the electric motor 10, the oil cooler 2, and the battery that requires air circulation while it is charged are arranged in the flow of air from an inlet 16 to the electric fan 3. Thus as cooling and air circulation can be executed by a signal fan, cost can be reduced, and guiding air which becomes hot as a result of cooling to a cab through a duct 14 plays the role of a heater fan and thereby saves power consumption.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery driven hydraulic excavator that drives a hydraulic pump by supplying electric power from a battery to an electric motor.

[0002]

2. Description of the Related Art The gas generated when a battery is charged is, for example, a highly flammable hydrogen gas in the case of a lead storage battery, which is extremely dangerous when it is full. To prevent

[0003]

In order to open the upper part of the battery, it is necessary to open the cover above the battery. This not only complicates the configuration of the cover itself, but also places considerable restrictions on the weight and volume of equipment and structures placed on the cover. In addition, opening and closing operations above the battery, which must be performed each time charging is performed, are very troublesome.

[0004] Also, the battery is compared with the internal combustion engine.
The energy density is low, and the amount of work that can be performed per charge is very small compared to the amount of work that the internal combustion engine can perform in one refueling. However, there is a limit to increasing the size of the battery due to the size and weight constraints of the machine. For this reason, the current consumption of the battery needs to be suppressed as much as possible. However, if there is a heater fan, for example, the battery will run out as soon as the consumed power.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to discharge toxic gas out of a cover at the time of charging a battery with low power consumption without opening the upper part of the battery.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a work machine having a battery, an electric motor driven by the battery, and a hydraulic pump driven by the electric motor is generated when the battery is charged. Providing an electric fan for releasing toxic gas outside the machine eliminates the hassle of opening and closing the upper part of the battery, which must be performed for each charge, and contributes to the simplification of the battery cover, and the structure above the battery cover. Restrictions on object and equipment layout have been eliminated.

Conventionally, a fan has been provided to cool the hydraulic oil discharged by the electric motor or the hydraulic pump. However, the fan can be shared with the fan, that is, one fan is provided. By arranging the electric motor, the oil cooler, and the battery in the same space so that the fan can release the toxic gas generated during charging and cool the electric motor and hydraulic oil, the cost can be reduced. Further, conventionally, a fan is provided to cool the hydraulic oil discharged by the electric motor or the hydraulic pump, but the fan can be removed to guide hot air discharged from the fan to the vicinity of the driver's seat. By installing a simple duct, there is no need to attach a heater fan, saving current consumption and extending the work time per charge.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cutaway plan view showing a hydraulic excavator 1 according to an embodiment of the present invention. 4 is an upper revolving structure of the excavator 1, 5 is a rear cover plate member mounted on a rear surface of the upper revolving structure 4, 7 is a driver's seat, 8 is a hydraulic oil tank for hydraulic pressure, and 10 is a lower part of the hydraulic oil tank 8. An electric motor arranged, 11 is a hydraulic pump driven by the electric motor 10, 12 is a battery (specifically, a lead-type battery) mounted on the rear part of the excavator 1 and supplies electric power to the electric motor 10, and 13 forms a battery 12. A plurality of divided cells, 2 is an oil cooler for cooling hydraulic oil, 3 is an electric motor 10 and cools the oil cooler 2, and a toxic gas generated at the time of charging is discharged from the battery 12 to the outside of the body. An electric fan, 14 is a duct for guiding the warm air discharged from the electric fan 3 to a driver's seat, and 15 is a hydraulic oil tank 8, an electric motor 10, a battery 12, and an oil cooler 2 in the same space. A cover assembly that surrounds you. FIG.
It is the incision side view which looked more.

The arrows shown in FIGS. 1 and 2 indicate the flow of air by the electric fan 3 in the cover. in this way,
Hydraulic oil tank 8 that needs cooling during operation, electric motor 1
0, the oil cooler 2, and the battery 12 that requires air circulation at the time of charging are all arranged in the flow of air from the air intake port 16 to the electric fan 3, so that cooling and air circulation can be performed by one fan. , Cost can be reduced.
Further, the air whose temperature has risen due to the cooling is led to the driver's seat through the duct 14, so that the air can be used as a heater fan, and the power consumption largely related to the excavation time per charge can be reduced. Also, battery 1
Since the air circulation can also be performed, there is no need to open the upper part of the battery as in the related art, and the structural limitation can be eased.

As a modification, in the above-described embodiment, the electric fan 3 is disposed at the front right of the driver's seat 7. However, the electric fan 3 may be disposed at the front of the machine, and if the duct 14 is made detachable. In summer, for example, the duct 14 can be removed to prevent hot air from being blown around the driver's seat 7. In addition, the outlet of the duct 14 faces the hand in this embodiment, but may face, for example, the feet. Also, the oil cooler 2 may not be required depending on the base machine. In the embodiment, the position 16 is the air inlet and the position of the electric fan 3 is the air outlet. For example, by changing the wind direction of the electric fan 3, the position 16 is the air outlet and the electric fan 3 May be used as an air inlet, and warm air may be drawn in from the position 16 by a duct 14 '(FIG. 3). As for the positions of the air inlet 16 and the electric fan 3, it is desirable to dispose the air outlet and the air inlet at positions farthest from the space of the cover 15, but as shown in FIG. One (16 and 1
6 ') and the air inlet 16' when charging the battery.
By closing the air inlet 16 during operation and shortening the distance from the air inlet to the electric fan, the efficiency of air circulation can be increased.

[0011]

According to the present invention, the toxic gas generated from the battery at the time of charging can be discharged to the outside of the battery cover. This has contributed to the simplification of the battery cover, and has eliminated restrictions on the structure above the battery cover and the arrangement of devices. According to the second aspect, the cost can be reduced by sharing the electric fan used for the two purposes of cooling the heat-generating device and discharging toxic gas generated at the time of charging the battery to the outside of the cover. According to the third aspect, the hot air used for cooling the heat-generating device is used as a heater, and the number of heaters can be reduced. Further, the fourth aspect utilizes the cooling of the heat-generating device, the release of toxic gas, and the cooling of the heat-generating device. The electric fan used for the three purposes of the heater was shared, and further cost reduction was realized.

[Brief description of the drawings]

FIG. 1 is a cutaway plan view showing a device arrangement of a construction machine according to a first embodiment of the present invention.

FIG. 2 is a cutaway plan view as viewed from S in FIG. 1;

FIG. 3 is a cutaway plan view showing a device arrangement of a construction machine according to a second embodiment of the present invention.

FIG. 4 is a cutaway plan view showing a device arrangement of a construction machine according to a third embodiment of the present invention.

[Explanation of symbols]

 2 Oil cooler 3 Electric fan 8 Hydraulic oil tank 10 Electric motor 11 Hydraulic pump 12 Battery 14 Duct 15 Cover assembly 16, 16 'Air suction port

Claims (4)

[Claims] In a hydraulic excavator having a battery, an electric motor driven by the battery, and a hydraulic pump driven by the electric motor, air in the cover is discharged to the outside of the cover by a cover surrounding the battery. A battery-operated hydraulic shovel comprising an electric fan. 2. A hydraulic shovel having a battery, an electric motor driven by the battery, and a hydraulic pump driven by the electric motor, wherein a cover surrounding the battery and the device that generates heat, such as the electric motor, as the same space. A battery-driven hydraulic shovel, further comprising an electric fan for discharging air in the cover to the outside of the cover. 3. A hydraulic shovel having a battery, an electric motor driven by the battery, and a hydraulic pump driven by the electric motor, wherein a cover surrounding the device that generates heat, such as the electric motor, has air inside the cover. A battery-operated hydraulic shovel, comprising: an electric fan that discharges air outside the cover; and a duct that guides warm air discharged from the electric fan to a vicinity of a driver's cab. 4. A battery-operated hydraulic excavator according to claim 2, wherein a duct for guiding warm air discharged from said electric fan to a vicinity of a cab is mounted.