JP2008019616A - Motor-driven construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven construction machine capable of enhancing reliability of a battery, by surely cooling the battery, when operating an electric motor. <P>SOLUTION: The battery 19 is oppositely arranged on the rear side of the electric motor 14 and a hydraulic pump 15, and a part between an output shaft 14A of the electric motor 14 and an input shaft 15A of the hydraulic pump 15 is connected by a coupling 16 having blades 16A on the outer peripheral side. Among a motor bracket 11 for installing the electric motor 14 and the hydraulic pump 15, a space surrounded by a bottom plate 11A, a left vertical plate 11B, a right vertical plate 11C, an upper plate 11D and respective connecting plates 11F, is formed as a cooling air guide 13 surrounding the coupling 16. Thus, when the coupling 16 rotates by operating the electric motor 14, cooling air is generated by the respective blades 16A arranged in this coupling 16, and the battery 19 can be surely cooled by introducing this cooling air to the battery 19 by the cooling air guide 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric construction machine such as a hydraulic excavator and a wheel loader provided with a battery as a power source.

  Generally, a construction machine such as a hydraulic excavator used for excavation work or dismantling work is driven by a hydraulic pump by an engine so that a traveling hydraulic motor, a turning hydraulic motor, various hydraulic cylinders constituting a working device, etc. The pressure oil for operation is supplied toward

  On the other hand, when performing excavation work or dismantling work in a building such as a warehouse, an electric motor is provided in place of the engine in order to prevent the working environment from being lowered by exhaust gas from the engine. 2. Description of the Related Art An electric hydraulic excavator provided with a battery that supplies power to the motor is known (see, for example, Patent Documents 1 and 2).

JP-A-9-158247 Japanese Patent Laid-Open No. 9-144061

  These electric hydraulic excavators according to the prior art are arranged with an electric motor and a hydraulic pump extending leftward and rightward on the rear side of the swing frame, and a plurality of batteries inside on the left side of the front portion of the swing frame. It is set as the structure which arrange | positions the battery case which accommodated.

  Here, the battery case is a flat box having a small height and occupies a large area on the revolving frame. For this reason, the above-described hydraulic excavator according to the related art does not have a driver seat on which the operator is seated on the turning frame, and is configured to be operated by remote control.

  In addition, another conventional electric hydraulic excavator has a driver's seat disposed on the left side of the front portion of the swing frame, and an electric motor and a hydraulic pump disposed on the right side of the front portion in a state of extending in the front and rear directions. On the rear side of the swivel frame, a battery case containing a plurality of batteries is arranged (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 9-144062

  By the way, the electric hydraulic excavator according to the prior art normally cools a battery that generates heat by discharge or the like by using wind (running wind) received by the vehicle body during traveling. However, hydraulic excavators often stay at a fixed work position and perform earth and sand excavation work, so it is not possible to sufficiently cool the battery using traveling wind, etc., and the durability and reliability of the battery is reduced. There is a problem of end up.

  Further, in the above-described electric hydraulic excavator according to the prior art, when the battery is replaced, each battery case in which the battery is housed, that is, a heavy object in which the battery case and the battery are integrated is attached to the revolving frame. It is necessary to install and remove. For this reason, there exists a problem that workability | operativity at the time of replacement | exchange of this battery is bad.

  The present invention has been made in view of the above-described problems of the prior art, and provides an electric construction machine that can reliably cool a battery during operation of an electric motor and can improve the reliability of the battery. The purpose is that.

  Another object of the present invention is to provide an electric construction machine capable of improving workability when replacing a battery.

  In order to solve the above-described problems, the present invention provides a vehicle body frame that includes a support structure and is provided with a working device on the front side, an electric motor that is mounted on the vehicle body frame, and a hydraulic pump that is driven by the electric motor. And a battery mounted on the vehicle body frame and supplying power to the electric motor.

  According to a first aspect of the present invention, the battery is disposed on the rear side of the vehicle body frame, the electric motor and the hydraulic pump are disposed opposite to the front side of the battery, and the output shaft of the electric motor and the A coupling for connecting the two to the input shaft of the hydraulic pump is provided, and the cooling air that is formed to surround the coupling and that is generated from the coupling when the electric motor rotates is guided to the battery. The configuration is such that a guide is provided.

  According to a second aspect of the present invention, there is provided a vehicle body frame having a support structure and a working device provided on the front side, an electric motor mounted on the vehicle body frame, a hydraulic pump driven by the electric motor, and the vehicle body In an electric construction machine comprising a battery mounted on a frame and supplying power to the electric motor, the battery is disposed on the rear side of the vehicle body frame and positioned on the rear side of the electric motor and the hydraulic pump. The battery case is housed in a battery case, and the battery case is rotatably attached to the vehicle body frame with the lower side as a fulcrum.

  According to a third aspect of the present invention, a case mounting bracket is erected on the rear side of the vehicle body frame, and a lower side of the battery case is rotatably attached to the case mounting bracket. The case mounting bracket, the battery case, In the meantime, an angle adjustment mechanism for adjusting the rotation angle of the battery case is provided.

  According to a fourth aspect of the present invention, the battery acts as a counterweight that balances the weight of the work device.

  According to the first aspect of the present invention, when the coupling rotates and cooling air is generated, the cooling air from the coupling is guided to the battery by the cooling air guide formed surrounding the coupling. Can do. Therefore, when the electric motor is operated, the cooling air from the coupling can be constantly supplied to the battery. As a result, even when the construction machine stays at a fixed position and performs excavation work or the like, the battery can be reliably cooled, and the durability and reliability of the battery can be improved.

  According to the invention of claim 2, it is possible to replace only the battery with respect to the battery case in a state where the battery case is rotated with respect to the vehicle body frame. Therefore, for example, as compared with a case where the battery case and the battery are integrally attached to and removed from the frame, only a battery having a small weight can be attached to and removed from the battery case. Workability at the time can be improved.

  According to the invention of claim 3, the battery case accommodated in the battery case is taken out by appropriately adjusting the rotation angle of the battery case with respect to the case mounting bracket erected on the vehicle body frame by the angle adjustment mechanism. The battery can be easily attached to the battery case, and the workability can be further enhanced.

  According to the invention of claim 4, the weight of the battery provided on the rear side of the vehicle body frame can be effectively used as the counterweight. This eliminates the need for a counterweight as a mere heavy object, thereby increasing the degree of freedom in layout when placing various types of equipment on the body frame, and reducing the size of the entire construction machine. Can be

  Hereinafter, an embodiment of an electric work machine according to the present invention will be described in detail with reference to FIGS. 1 to 7 by taking as an example a case where it is applied to a hydraulic excavator.

  In the figure, 1 is an electric hydraulic excavator. The hydraulic excavator 1 is mounted on a self-propelled crawler type lower traveling body 2 and can be turned on the lower traveling body 2, together with the lower traveling body 2. And an upper swing body 3 constituting a vehicle body. A swing type work device 4 for performing excavation work of earth and sand is provided on the front side of the upper swing body 3.

  Here, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that the upper turning body 3 can turn within the vehicle width of the lower traveling body 2. The upper swing body 3 includes a swing frame 5, an electric motor 14, a hydraulic pump 15, a battery case 17, a battery 19, and the like which will be described later.

  Reference numeral 5 denotes a revolving frame as a vehicle body frame serving as a base of the upper revolving structure 3, and the revolving frame 5 is formed using, for example, a thick steel plate or the like and forms a strong support structure. The working device 4 is attached to the front side of the revolving frame 5 so as to be swingable in the left and right directions and so as to be able to move up and down. On the other hand, a plurality of mounting bases 6, 6,... For mounting a motor bracket 11 to be described later are provided on the rear side of the turning frame 5 (see FIG. 6). In addition, a case mounting bracket 7 to be described later is erected on a portion of the revolving frame 5 that is on the rear side of each mounting base 6.

  Reference numeral 7 denotes a case mounting bracket which is erected on the rear side of the revolving frame 5. The case mounting bracket 7 has a rectangular frame shape as a whole, and a battery case 17 described later is rotatably mounted thereon. Here, as shown in FIGS. 3, 4 and 7, etc., the case mounting bracket 7 is fixed to the upper surface of the revolving frame 5 using bolts or the like, and stands vertically upward while facing the left and right directions. The left column 7C and the right column 7B having a substantially trapezoidal shape, and the left column 7C and the right column having an L-shaped cross section, which are fixed to the upper ends of the left and right columns 7A and 7B by welding or the like and extend upward. 7D and these left and right rising plates 7A and 7B and a plurality of connecting beams 7E connecting the left and right struts 7C and 7D are roughly configured. In addition, pins 7F and 7F that rotatably support a battery case 17 described later are provided on the lower ends of the left and right rising plates 7A and 7B so as to protrude in the left and right directions.

  Reference numeral 8 is a support member provided on the revolving frame 5 in front of the case mounting bracket 7, and the support member 8 is a leg portion erected on the revolving frame 5 as shown in FIG. 8A and a support base 8B fixed on the leg portion 8A and extending in the left and right directions. Then, the base end side of the canopy 9 is attached to the support base 8 </ b> B of the support member 8.

  Reference numeral 10 denotes a driver seat pedestal provided on the revolving frame 5 in front of the support member 8, and a driver seat 10 </ b> A on which an operator is seated is provided on the driver seat pedestal 10. An operation lever 10B that is operated by an operator is disposed on both the left and right sides of the driver's seat 10A.

  Reference numeral 11 denotes a motor bracket provided on the rear side of the revolving frame 5. The motor bracket 11 is attached with an electric motor 14 and a hydraulic pump 15 which will be described later. Here, as shown in FIGS. 2 to 6, the motor bracket 11 has a rectangular bottom plate 11A extending in the left and right directions, and a hexagon erected on the upper surface side of the bottom plate 11A while facing the left and right directions. A left vertical plate 11B and a right vertical plate 11C having a shape, a rectangular upper plate 11D which is fixed to the upper ends of the left and right vertical plates 11B and 11C and faces the bottom plate 11A in the upward and downward directions, and a left vertical plate The front and rear mounting plates 11E and 11E project horizontally from 11B toward the opposite side of the right vertical plate 11C, and a plurality of connecting plates 11F that connect the left and right vertical plates 11B and 11C. Has been.

  The motor bracket 11 is attached to each mounting base 6 provided on the rear side of the swivel frame 5 with an electric motor 14 (described later) attached to the right vertical plate 11C and a hydraulic pump 15 (described later) attached to the left vertical plate 11B. Each of them is attached via an anti-vibration mount 12. As a result, the motor bracket 11 is configured to elastically support the electric motor 14 and the hydraulic pump 15 on the revolving frame 5 via the anti-vibration mounts 12 in a horizontally placed state extending in the left and right directions. ing.

  Reference numeral 13 denotes a cooling air guide. As shown in FIGS. 5 and 6, the cooling air guide 13 includes a bottom plate 11A, a left vertical plate 11B, a right vertical plate 11C, an upper plate 11D, and each connecting plate constituting the motor bracket 11. It is formed as a space surrounded by 11F. A cooling air outlet 13 </ b> A that opens toward a battery 19 described later is formed between the two connecting plates 11 </ b> F located on the rear side of the motor bracket 11. Then, when a coupling 16 described later disposed in the cooling air guide 13 rotates, the cooling air by the coupling 16 is sent to the battery 19 through the cooling air outlet 13A as shown by an arrow F in FIG. It is a guided structure.

  An electric motor 14 is attached to the right vertical plate 11C of the motor bracket 11. The electric motor 14 serves as a power source for the hydraulic excavator 1, and operates when electric power is supplied from a battery 19 described later. It is. The electric motor 14 is attached to the right side surface of the right vertical plate 11C using a bolt or the like, and the output shaft 14A of the electric motor 14 projects into the cooling air guide 13 through the right vertical plate 11C. .

  Reference numeral 15 denotes a hydraulic pump attached to the left vertical plate 11B of the motor bracket 11. The hydraulic pump 15 is provided on the hydraulic cylinder and hydraulic excavator 1 provided in the work device 4 by being driven by the electric motor 14. In addition, hydraulic oil for operation is supplied to an actuator of a traveling hydraulic motor, a turning hydraulic motor or the like (both not shown). The hydraulic pump 15 is attached to the left side surface of the left vertical plate 11B using a bolt or the like, and the input shaft 15A of the hydraulic pump 15 is configured to protrude into the cooling air guide 13 through the left vertical plate 11B. . As described above, the electric motor 14 and the hydraulic pump 15 attached to the motor bracket 11 are horizontally placed so as to extend in the left and right directions on the rear side of the turning frame 5 while facing the battery 19 described later in the front and rear directions. Is arranged.

  A coupling 16 connects the output shaft 14 A of the electric motor 14 and the input shaft 15 A of the hydraulic pump 15, and the coupling 16 transmits the rotation of the electric motor 14 to the hydraulic pump 15. Here, the coupling 16 is formed in a cylindrical shape as a whole, and a plurality of blades 16A project from the outer peripheral side thereof. The coupling 16 is accommodated in the cooling air guide 13 in a state where the output shaft 14A of the electric motor 14 and the input shaft 15A of the hydraulic pump 15 are connected.

  Therefore, when the electric motor 14 is operated to rotate the coupling 16 and the cooling air is generated by the blades 16A provided on the coupling 16, the cooling air is indicated by an arrow F in FIG. The cooling air guide 13 is led from a cooling air outlet 13 </ b> A to a later-described battery 19 to cool the battery 19.

  Reference numeral 17 denotes a battery case which is located behind the electric motor 14 and the hydraulic pump 15 and provided on the rear side of the revolving frame 5. The battery case 17 has a case mounting bracket whose lower side is provided on the revolving frame 5. 7 is rotatably attached to a battery 19 to be described later.

  Here, as shown in FIG. 3, FIG. 4, FIG. 7, etc., the battery case 17 includes a substantially rectangular bottom plate 17A extending in the left and right directions, and a rear plate that rises vertically upward from the rear edge of the bottom plate 17A. 17B and the left and right side edges of the rear plate 17B are folded forward, the left and right bent plates 17C and 17D facing each other in the left and right directions, and the left and right side edges of the bottom plate 17A. The upper end of the vertical rising upward is roughly constituted by a substantially trapezoidal left rising plate 17E and a right rising plate 17F fixed to the left and right bent plates 17C and 17D.

  In this case, the left and right rising widths of the left and right rising plates 17E and 17F constituting the battery case 17 are the left and right rising dimensions of the left and right rising plates 7A and 7B constituting the case mounting bracket 7, respectively. It is set smaller than the width dimension. Accordingly, the left and right rising plates 17E and 17F of the battery case 17 are sandwiched between the left and right rising plates 7A and 7B of the case mounting bracket 7.

  Also, left and right hooks 17G and 17G that engage with the left and right pins 7F of the case mounting bracket 7 protrude downward on the lower surfaces of both left and right directions of the bottom plate 17A constituting the battery case 17. Has been. And the battery case 17 engages the left and right hooks 17G provided on the lower end side thereof with the left and right pins 7F of the case mounting bracket 7, thereby moving the battery case 17 forward and backward around the pin 7F. It is configured to rotate (tilt). Further, a stopper 17H made of a rectangular flat plate protrudes downward from the center lower surface side of the bottom plate 17A.

  In this manner, the battery case 17 rotates between the battery holding position shown in FIG. 3 and the battery replacement position shown in FIG. 4 with the pin 7F of the case mounting bracket 7 as the center. When the battery case 17 reaches the battery holding position, the battery 19 is held between the battery case 17 and the case mounting bracket 7. When the battery case 17 reaches the battery replacement position, for example, the exhausted battery 19 is replaced with a new battery 19. It can be exchanged for. Further, the stopper 17 </ b> H protruding from the bottom plate 17 </ b> A of the battery case 17 is configured to position the battery case 17 at the battery holding position by contacting the revolving frame 5.

  Reference numeral 18 denotes an angle adjusting mechanism provided between the case mounting bracket 7 and the battery case 17, and the angle adjusting mechanism 18 adjusts the rotation angle of the battery case 17 with respect to the case mounting bracket 7. Here, as shown in FIG. 7 and the like, the angle adjusting mechanism 18 includes a screw support 18A attached to the left rising plate 17E of the battery case 17, and one end side rotatably supported by the screw support 18A. The screw shaft 18B whose end side extends toward the case mounting bracket 7 and a screw holder 18C that is attached to the left rising plate 7A of the case mounting bracket 7 and into which the screw shaft 18B is screwed are roughly configured.

  Then, as shown in FIGS. 3 and 4, the angle adjusting mechanism 18 has a screw support 18A on the battery case 17 side and a case mounting bracket 7 side according to the tightening amount of the screw shaft 18B with respect to the screw receiver 18C. The rotation angle of the battery case 17 around the pin 7F of the case mounting bracket 7 is appropriately adjusted by changing the distance from the screw holder 18C.

  A battery 19 is provided on the rear end side of the revolving frame 5 in a state of being accommodated in the battery case 17, and the battery 19 supplies power to the electric motor 14. Here, the battery 19 is composed of an assembly of a plurality of small batteries that are electrically connected, and is formed as one unit having a rectangular shape as a whole by using, for example, a frame or the like.

  The battery 19 is attached and removed in the direction indicated by the arrow H in FIG. 4 with the battery case 17 in the battery replacement position shown in FIG. 4, and when the battery case 17 is in the battery holding position shown in FIG. The case mounting bracket 7 and the battery case 17 are held in a state of rising upward and downward.

  In this case, the battery case 17 and the battery 19 are arranged together with the battery case 17 together with the battery case 17 so that the battery case 17 and the battery 19 rise upward and downward on the rear end side of the revolving frame 5. It acts as a counterweight that balances the weight. For this reason, a counterweight as a mere heavy object can be eliminated, and the area occupied by the battery 19 on the revolving frame 5 can be reduced, and the electric motor 14, the hydraulic pump 15, It has a configuration that can increase the degree of freedom in layout when mounting equipment such as a hydraulic oil tank (not shown).

  Reference numeral 20 denotes a rear cover attached to the battery case 17, and the rear cover 20 covers the battery case 17, the battery 19, and the like from the rear. Here, the rear cover 20 is formed in a flat plate shape that is slightly larger than the battery case 17 using a steel plate material or the like, and extends in the left and right directions. The rear cover 20 is attached to the rear plate 17B of the battery case 17 via a bracket 21 as shown in FIGS. 3 and 4, and the battery case 17 while following the rotating operation of the battery case 17, The battery 19 and the like are always covered from behind.

  Reference numeral 22 denotes a left side cover provided extending forward from the left end portion of the rear cover 20, and the left side cover 22 covers the hydraulic pump 15 and the like from the left side as shown in FIGS. . Reference numeral 23 denotes a right side cover that extends forward from the right end portion of the rear cover 20, and the right side cover 23 covers the electric motor 14, a hydraulic oil tank (not shown), and the like from the right side. .

  Reference numeral 24 denotes a step-up transformer disposed on the upper side of the battery case 17, and the transformer 24 is attached to the support base 8B of the support member 8 using a bracket 25 as shown in FIG. The boosting transformer 24 boosts the current supplied from the battery 19 to the electric motor 14 to a voltage suitable for the electric motor 14.

  The electric excavator 1 according to the present embodiment has the above-described configuration. When the electric motor 14 is rotated by power supplied from the battery 19 accommodated in the battery case 17, the hydraulic pump 15 is driven by the electric motor 14. Driven. Then, the hydraulic oil discharged from the hydraulic pump 15 is supplied to a hydraulic actuator such as a traveling hydraulic motor mounted on the hydraulic excavator 1, a turning hydraulic motor (not shown), and a hydraulic cylinder constituting the working device 4. As a result, traveling operation, turning operation, excavation work using the work device 4 and the like of the excavator 1 can be performed.

  Here, when the excavator 1 performs excavation work, the battery 19 generates heat due to discharge, and therefore, the battery 19 needs to be cooled. On the other hand, in the present embodiment, as shown in FIGS. 5 and 6, a battery 19 is disposed on the rear side of the electric motor 14 and the hydraulic pump 15, and the output shaft 14 </ b> A of the electric motor 14 and the hydraulic pump 15 are arranged. The input shaft 15A is connected by a coupling 16 having blades 16A on the outer peripheral side.

  Thus, when the electric motor 14 is operated and the coupling 16 is rotated, cooling air is generated by the blades 16A provided on the coupling 16, and the cooling air is supplied to the battery as indicated by an arrow F in FIG. The battery 19 is led to cool the battery 19. As described above, when the electric motor 14 is operated, the cooling air from the coupling 16 can be constantly supplied to the battery 19, so that the excavator 1 stays at a certain work position and performs excavation work or the like. Even when traveling wind cannot be supplied to the battery 19, the battery 19 can be reliably cooled, and the durability and reliability of the battery 19 can be improved.

  Of the motor bracket 11 to which the electric motor 14 and the hydraulic pump 15 are attached, a space surrounded by the bottom plate 11A, the left vertical plate 11B, the right vertical plate 11C, the upper plate 11D, and each connecting plate 11F is coupled to the coupling 16. The cooling air guide 13 is formed to surround the motor bracket 11, and a cooling air outlet 13 </ b> A that opens toward the battery 19 is provided between the two connecting plates 11 </ b> F located on the rear side of the motor bracket 11. Thereby, since the cooling air generated by the rotation of the coupling 16 can be guided to the battery 19 through the cooling air outlet 13A of the cooling air guide 13, a large amount of cooling air can be supplied to the battery 19, and the battery 19 can be efficiently cooled.

  Next, when the excavator 1 is operated for a long time and the battery 19 is exhausted, it is necessary to replace the exhausted battery 19 with a new charged battery 19.

  In this case, as shown in FIG. 4, the screw shaft 18B of the battery angle adjusting mechanism 18 provided between the battery case 17 and the case mounting bracket 7 is rotated in the loosening direction to support the screw on the battery case 17 side. The space between the tool 18A and the screw receiving tool 18C on the case mounting bracket 7 side is widened. As a result, the battery case 17 rotates (tilts) rearward about the pin 7F of the case mounting bracket 7 and the battery 19 shown in FIG. 4 is moved from the battery holding position shown in FIG. Rotate to the exchange position.

  Thus, when the battery case 17 is rotated to the battery replacement position, a large space for replacement work can be secured above the battery 19 as shown in FIG. Etc. (not shown) is used to lift the battery 19 upward (in the direction of arrow H in FIG. 4), so that only the exhausted battery 19 can be removed from the battery case 17.

  Next, after removing the exhausted battery 19, only the new charged battery 19 is lifted and accommodated in the battery case 17. Then, the screw shaft 18B of the battery angle adjusting mechanism 18 is rotated in the tightening direction, and the interval between the screw support 18A on the battery case 17 side and the screw support 18C on the case mounting bracket 7 side is narrowed. As a result, the battery case 17 rotates from the battery replacement position shown in FIG. 4 to the battery holding position shown in FIG. 3 around the pin 7F of the case mounting bracket 7 with the new battery 19 being accommodated. It stops in a state where the lower end of 17H is in contact with the upper surface of the revolving frame 5. In this manner, the replaced new battery 19 can be held in a state of rising upward and downward between the case mounting bracket 7 and the battery case 17.

  As described above, according to the present embodiment, the battery case 17 that rotates forward and backward with the pin 7F of the case mounting bracket 7 as a fulcrum is provided behind the electric motor 14 and the hydraulic pump 15. Since the battery 19 is accommodated in the battery case 17, only the battery 19 is attached to and removed from the battery case 17 in a state where the battery case 17 is rotated to the battery replacement position shown in FIG. 4. Can do.

  Therefore, since only the battery 19 having a small weight can be attached to and removed from the battery case 17, for example, the battery 19 is replaced as compared with the case of attaching and removing a heavy battery integrated with the battery case. The workability when doing can be improved.

  In addition, an angle adjusting mechanism 18 is provided between the battery case 17 and the case mounting bracket 7, and the rotation angle of the battery case 17 with respect to the case mounting bracket 7 is appropriately adjusted by the angle adjusting mechanism 18, whereby the battery case 17. The removal work of the battery 19 accommodated in the battery and the attachment work of the battery 19 to the battery case 17 can be easily performed, and the workability can be further enhanced.

  Further, by arranging the battery 19 which is a heavy object together with the battery case 17 so as to rise upward and downward to the rear end side of the revolving frame 5, the battery case 17 and the battery 19 are connected to the work device 4. It can be used as a counterweight that balances the weight.

  For this reason, a counterweight as a mere heavy object can be eliminated, and the area occupied by the battery 19 on the revolving frame 5 can be reduced, and the electric motor 14, the hydraulic pump 15, The degree of freedom of layout can be increased when mounting equipment such as a hydraulic oil tank (not shown).

  In the above-described embodiment, the case where the plurality of blades 16A are provided in the coupling 16 that connects the output shaft 14A of the electric motor 14 and the input shaft 15A of the hydraulic pump 15 is illustrated. However, the present invention is not limited to this. For example, a coupling in which an uneven portion or the like is provided on the outer peripheral surface in place of the blade may be used, and cooling air may be generated by the uneven portion or the like of the coupling.

  In the above-described embodiment, the excavator 1 is described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other electric construction machines such as a hydraulic crane and a wheel loader.

1 is a front view showing an electric hydraulic excavator according to an embodiment of the present invention. It is the right view which looked at the hydraulic shovel from the arrow II-II direction in FIG. FIG. 3 is a partially broken cross-sectional view of an electric motor, a hydraulic pump, a battery case, a battery, and the like when viewed from the direction of arrows III-III in FIG. 2. FIG. 4 is a partially broken sectional view similar to FIG. 3, showing a state in which the battery case is rotated to the battery replacement position. It is sectional drawing of a partially broken view which looked at the coupling, the cooling wind guide, the battery case, the battery, etc. from the arrow VV direction in FIG. It is a disassembled perspective view which shows a motor bracket, an electric motor, a hydraulic pump, a coupling, etc. It is a disassembled perspective view which shows a case attachment bracket, a battery case, etc.

Explanation of symbols

1 Excavator (construction machine)
5 Turning frame (body frame)
7 Case mounting bracket 7F pin 11 Motor bracket 13 Cooling air guide 13A Cooling air outlet 14 Electric motor 14A Output shaft 15 Hydraulic pump 15A Input shaft 16 Coupling 16A Blade 17 Battery case 18 Angle adjustment mechanism 19 Battery

Claims (4)

A body frame having a support structure and a working device provided on the front side, an electric motor mounted on the body frame, a hydraulic pump driven by the electric motor, and the electric motor mounted on the body frame In an electric construction machine comprising a battery that supplies power to
The battery is disposed on the rear side of the body frame, and the electric motor and the hydraulic pump are disposed opposite to the front side of the battery, and both are disposed between the output shaft of the electric motor and the input shaft of the hydraulic pump. And a cooling air guide that is formed surrounding the coupling and that guides the cooling air generated from the coupling to the battery when the electric motor rotates. Electric construction machine. A body frame having a support structure and a working device provided on the front side, an electric motor mounted on the body frame, a hydraulic pump driven by the electric motor, and the electric motor mounted on the body frame In an electric construction machine comprising a battery that supplies power to
The battery is housed in a battery case located behind the electric motor and the hydraulic pump and disposed on the rear side of the vehicle body frame, and the battery case is rotatable to the vehicle body frame with a lower side as a fulcrum. An electric construction machine characterized in that it is configured to be attached to a motor.   A case mounting bracket is erected on the rear side of the vehicle body frame, the lower side of the battery case is rotatably attached to the case mounting bracket, and the battery case is interposed between the case mounting bracket and the battery case. The electric construction machine according to claim 2, wherein an angle adjustment mechanism for adjusting the rotation angle of the motor is provided. The electric construction machine according to claim 1, 2 or 3, wherein the battery acts as a counterweight that balances the weight with the work device.

Images