JP2005289181A - Battery mounting structure of battery-driven type shovel, and battery unit used for the battery-driven type shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a battery-driven type shovel which increases a battery-mounting capacity, without increasing the size of a present shape of a construction machine, and is excellent in safety, and easy to change a battery. <P>SOLUTION: In the structure, a battery unit 19 with a battery for an electric motor to drive a hydraulic pump for driving a working machine stored therein is arranged by effectively utilizing a lower space 21 held by a pair of crawlers 20, 20 of a lower traveling body 11. The battery of large capacity can be arranged without increasing the size of a structure of an upper turning body 13, and the posture of the entire construction machine is stabilized while the position of the center of gravity of the entire construction machine is lowered. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a battery mounting structure for a battery-driven excavator and a battery unit used for the battery-driven excavator, and in particular, a battery that supplies battery power to an electric motor and is driven by the driving force of the electric motor. The present invention relates to a battery mounting structure for a drive excavator and a battery unit used for the battery drive excavator.

  In recent years, various construction machines having improved work environments such as exhaust gas and noise have been proposed. One example is a hybrid construction machine that uses both an engine and an electric motor. This hybrid construction machine is provided with an electric motor driven by battery power in addition to a hydraulic pump for driving a work machine driven by engine power. When the work implement drive mode is switched, the drive of the hydraulic pump can be changed to “battery drive”, “engine drive”, or “engine drive and battery-assisted drive”. By switching accordingly, the engine load is reduced to improve exhaust gas and noise. The battery is provided on an upper swing body that is pivotably disposed on the lower traveling body (see, for example, Patent Document 1).

Further, since an engine cannot be used at a work site where non-exhaust gas is required, such as tunnel construction, an electric construction machine equipped with only an electric motor is also known (for example, see Patent Document 2).
Japanese Patent Application Laid-Open No. 2002-227241. Japanese Patent Laid-Open No. 10-317429.

  However, the construction machines described in Patent Document 1 and Patent Document 2 have a drawback that a large amount of battery is required. And the battery is arrange | positioned on the upper revolving body in any invention of patent document 1 and patent document 2. For this reason, there is a problem that the arrangement density of the battery and the peripheral devices is increased, the neighbors approach each other, and maintenance is difficult. Moreover, since the weight of the upper turning body is increased and the center of gravity of the entire construction machine is set at a high position, it is disadvantageous in terms of stability. Further, since the battery to be used is not configured in consideration of replacement, it is difficult to replace the battery, and there is no consideration of preparing a spare and proceeding with the replacement.

  Therefore, the problem is solved in order to obtain a battery-powered excavator capable of increasing the battery mounting capacity without increasing the current shape of the construction machine, having excellent stability, and easily replacing the battery. The technical problem which should arise arises, and this invention aims at solving this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is a battery-driven construction machine provided with an electric motor driven by the power of the battery. A battery mounting part for holding the battery unit in a lower space sandwiched between a pair of crawlers of the lower traveling body, and storing the battery unit in the lower space using the battery mounting part. Provided is a battery mounting structure for a battery-powered excavator to be mounted.

  According to this configuration, a large capacity battery can be arranged by effectively using the lower space sandwiched between the pair of crawlers of the lower traveling body. Further, by arranging the battery unit in the lower space of the lower traveling body, the position of the center of gravity of the entire construction machine can be lowered.

  According to a second aspect of the present invention, there is provided a battery mounting structure for a battery-powered excavator, wherein the battery mounting portion is provided with a concave groove for guiding the movement of the battery unit from the attachment / detachment operation position to the set position in the lower space. .

  According to this configuration, the battery unit can be moved between the attaching / detaching operation position for attaching and detaching the battery unit and the setting position for setting the battery unit by using the concave groove as the guide means.

  According to a third aspect of the present invention, there is provided a battery unit mounted on a battery-driven construction machine including an electric motor driven by battery power, wherein the battery-driven excavator is provided with a moving wheel below the battery unit. A battery unit to be used is provided.

  According to this configuration, the battery unit can be transported manually using the moving wheels.

  According to the first aspect of the present invention, since a large-capacity battery can be arranged using the lower space sandwiched between a pair of crawlers of the lower traveling body, battery driving over a long period of time is possible, and construction is possible. It can contribute to clean the working environment of the machine with low noise. In addition, by providing the battery unit in the lower space of the lower traveling body, it is possible to secure an arrangement space for devices, auxiliary equipment, etc. disposed in the upper swing body without increasing the shape of the upper swing body. It contributes to the improvement of assembly workability and maintenance workability. Furthermore, the center of gravity of the entire construction machine can be lowered, which contributes to the improvement of stability.

  According to the second aspect of the invention, the battery unit can be moved to the set position and the attachment / detachment operation position using the concave groove as the guide means, respectively, so that the setting and attachment / detachment operation can be easily performed. In addition to the effects, if a spare battery unit is prepared, the battery can be easily replaced and used, which contributes to the improvement of convenience.

  In the invention according to claim 3, since the battery unit can be transported manually by using a moving wheel, the battery contributing to improvement in workability at the time of battery replacement by being used in a construction machine. The effect that a unit is obtained can be expected.

  In order to obtain a structure of a battery-powered excavator that can increase the battery mounting capacity without increasing the current shape of the construction machine, has excellent stability, and is easy to replace the battery, A battery mounting portion is provided for holding a battery unit in which a battery for an electric motor for driving the hydraulic pump is stored in a lower space sandwiched between a pair of crawlers of the lower traveling body, and the battery unit is connected to the battery It was set as the structure accommodated in the said lower space using an attaching part.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator as a construction machine to which the present invention is applied. In FIG. 1, the excavator 10 has an upper swing body 13 mounted on a lower traveling body 11 via a swing mechanism 12 so as to be rotatable. The upper swing body 13 is provided with a cab 14 and a building 18, and a boom 15 is attached to the front center portion so as to be able to be raised and lowered. An arm 16 is attached to the tip of the boom 15 so as to be rotatable up and down, and a bucket 17 is attached to the tip of the arm 16.

  FIG. 2 is a rear view showing only the lower traveling body 11, the turning mechanism 12 and the upper turning body 13. The structure of the hydraulic excavator 10 will be further described with reference to FIG. 2. The upper swing body 13 includes an electric motor (not shown) driven by electric power stored in a battery in the building 18 and driving of the electric motor. In addition to a hydraulic pump (not shown) for driving a working machine that is driven by force, various devices and auxiliary devices (not shown) are also provided. On the other hand, a battery unit 19 containing one or a plurality of the batteries is detachably attached to the lower traveling body 11.

  The position on the lower traveling body 11 to which the battery unit 19 is attached is in a lower space 21 sandwiched between a pair of crawlers 20, 20 located on the left and right of the lower traveling body 11. That is, when the hydraulic excavator 10 is viewed from the rear, it is between the left and right crawlers 20 and 20, and when viewed from the left and right side surfaces, it is within the crawler projection area. In FIGS. 1 and 2, a state in which the two battery units 19 are disposed in the lower space 21 apart from each other in the front-rear direction is indicated by a one-dot chain line. In the lower space 21, a battery attachment portion 22 for detachably attaching the battery unit 19 is provided.

  FIG. 3 is a main part plan view showing a state in which two battery units 19, 19 are attached to the lower traveling body 11 via the battery attachment part 22. FIG. 4 is a plan view of the battery attachment part 22 and the battery unit 19. FIG. 5 is a side view of the battery units 19, 19. 3 to 5, the battery mounting portion 22 is a rail-shaped material having a substantially U-shaped cross section and provided with a concave groove 22 a on the inside, and a pair is provided. The pair of battery mounting portions 22 and 22 are fixed to the left and right side frames 23a constituting a part of the lower frame 23 (see FIG. 3) in the lower traveling body 11 by welding or bolting, respectively. The recessed grooves 22a and 22a are arranged in such a manner that the opening surfaces thereof are directed inward and parallel to each other and extended in the front-rear direction. The concave grooves 22a and 22a of the battery attachment portions 22 and 22 function not only as a function of attaching the battery units 19 and 19, but also as guide means for moving the battery units 19 and 19, and the concave grooves 22a. A stopper protrusion 27 is provided at a position in the middle of the protrusion.

  The battery unit 19 can be disposed between a pair of battery mounting portions 22 and 22 and is engaged with concave grooves 22a and 22a from one end side of the battery mounting portions 22 and 22 on the left and right side surfaces, respectively. A pair of rollers 24 and 24 that can roll in the concave grooves 22a and 22a are provided in a state of being separated in the front-rear direction. On the other hand, a pair of front and rear moving wheels 25, 25 are attached below the left and right side surfaces of the battery unit 19 so as to be rotatable about a shaft 26.

  The battery unit 19 configured as described above can be moved on the ground by using the wheels 25 for movement when the place is moved while being removed from the battery attachment portion 22. With this movement, when the battery unit 19 is transported to the vicinity of the battery mounting portion 22 in the excavator 10, the roller 24 is moved to the position of the battery mounting portion 22 at a position outside the lower space where the transport is completed. It is lifted at the attaching / detaching operation position corresponding to the rear end opening (the position indicated by the alternate long and short dash line in FIG. 3). Then, the rollers 24 and 24 are pushed in. As a result, the roller 24 moves while rolling in the concave groove 22a. When the roller 24 is moved to a predetermined set position, the front roller 24 abuts against the stopper protrusion 27 and stops. Then, when it is set at a predetermined set position, it is locked by means not shown and fixed and held at the set position. Moreover, the setting is completed by making necessary electrical connections. On the other hand, when removing, it can be removed by removing the lock and performing the reverse operation.

  Therefore, according to the battery mounting structure of the battery-driven excavator according to the present embodiment, the lower space 21 sandwiched between the pair of crawlers 20, 20 in the lower traveling body 11 is effectively used, Since the unitized battery, that is, the battery unit 19 is arranged, a large-capacity battery can be mounted without increasing the conventional external shape, and the hydraulic pump can be operated with battery power for a long time. Can be driven. This can contribute to creating a clean work environment with low noise. In addition, by providing the battery unit 19 in the lower space 21 of the lower traveling body 11, the arrangement of devices, auxiliary devices, etc. disposed in the upper revolving body 13 without increasing the shape of the upper revolving body 13. Space can be secured and the arrangement density can be reduced to facilitate assembly work and maintenance work. Furthermore, the position of the center of gravity of the entire shovel machine can be lowered, which contributes to the improvement of stability.

  Further, the roller 24 is engaged with the concave groove 22a which is a guide means, and the roller 24 is rolled in the concave groove 22a, thereby moving the battery unit 19 between the attachment / detachment operation position and the setting position. Since it can be attached and detached, it can be replaced easily. Therefore, if a plurality of spare battery units 19 are prepared, they can be exchanged and used, which contributes to improvement in convenience.

  Further, since the moving wheel 25 is provided in the battery unit 19, the battery unit can be manually transported to the target location using the moving wheel 25, so that the workability at the time of replacement is simplified. Can be

  In this embodiment, the case where both “engine drive” and “battery drive” can be driven has been described. However, the present invention can also be applied to a construction machine having only “battery drive”.

  In addition, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified one.

1 is a side view of a hydraulic excavator to which the present invention is applied. The rear view which showed only the lower traveling body, turning mechanism, and upper turning body of a hydraulic excavator. The top view which shows the principal part structure of the lower traveling body in a hydraulic shovel. The principal part disassembled perspective view of the battery mounting structure in a hydraulic excavator. The side view of the battery unit used for a battery mounting structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic excavator 11 Lower traveling body 12 Turning mechanism 13 Upper turning body 15 Building 19 Battery unit 20 Crawler 21 Lower space 22 Battery mounting part 22a Concave groove (guide means)
23 Lower frame 24 Roller 25 Wheel 27 Stopper protrusion

Claims (3)

In a battery-driven construction machine equipped with an electric motor driven by battery power,
A battery mounting portion for holding the battery unit storing the battery in a lower space sandwiched between a pair of crawlers of the lower traveling body;
A battery mounting structure for a battery-powered excavator, wherein the battery unit is mounted in the lower space using the battery mounting portion.   2. The battery mounting structure for a battery-driven excavator according to claim 1, wherein the battery mounting portion is provided with a concave groove for guiding the movement of the battery unit from the attaching / detaching operation position to the set position in the lower space. In a battery unit mounted on a battery-driven construction machine having an electric motor driven by battery power,
A battery unit for use in a battery-powered excavator, wherein a moving wheel is provided at a lower portion of the battery unit.

Images