Electro-hydraulic construction machine

Abstract

The rotary frame (16) comprises a frame left end part (16L), a bottom plate (160) and a left wall (161) vertically arranged in the front-back direction. The left-right width of the region between the frame left end portion (16L) and the left wall (161) is set to be smaller in the rear direction. A battery (50) is disposed in the turning frame, an electric motor (53) is disposed in a front portion of the region, and a hydraulic pump (54) is disposed in a rear portion of the region.

Description

Technical Field

[0001] The present invention relates to an electro-hydraulic construction machine. Background Art

[0002] Conventionally, as a construction machine such as a hydraulic excavator, a construction machine is known that includes a lower traveling body, an upper revolving body including a revolving frame rotatably supported by the lower traveling body, and a working device mounted on the upper revolving body.

[0003] The above-mentioned construction machine has a hydraulic pump that discharges working oil to drive the working device. The hydraulic pump is driven by an engine or an electric motor mounted on the construction machine. Patent Documents 1 and 2 disclose construction machines that respectively include: a battery unit disposed at the center of the upper revolving body, an electric motor disposed on the side of the battery unit, and a hydraulic pump. In these technologies, the upper revolving body has a plurality of vertical plates erected on the bottom plate of the revolving frame in the front-rear direction. The electric motor and the hydraulic pump are arranged on the bottom plate side by side in the front-rear direction on the left and right outer sides of one vertical plate.

[0004] In the above-mentioned construction machine, in order to improve the rigidity and strength of the upper revolving body, or considering the layout of the equipment mounted on the upper revolving body, the vertical plates are sometimes inclined with respect to the front-rear direction. In addition, in order to make the upper revolving body more compact, the outer peripheral portion of the horizontal plate of the revolving frame is sometimes formed into a shape that curves inward more toward the rear. In this case, there is a problem that it is difficult to arrange the electric motor and the hydraulic pump respectively in the limited space on the left and right outer sides of the vertical plate.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Patent Laid-Open Publication No. 2019-127751

[0008] Patent Document 2: Japanese Patent Laid-Open Publication No. 2021-080704 Summary of the Invention

[0009] An object of the present invention is to provide an electro-hydraulic construction machine in which an electric motor and a hydraulic pump can be compactly arranged even in a limited space at the end of a revolving frame.

[0010] The present invention provides an electrohydraulic construction machine. The construction machine includes: a swing frame having a center line extending in the front-rear direction; a battery unit configured on the swing frame; an electric motor that operates using the power supplied by the battery unit; and a hydraulic pump having a width dimension in the left-right direction smaller than that of the electric motor when viewed from above, and the hydraulic pump receives the driving force of the electric motor and discharges working oil. The swing frame includes: one of the left and right side ends; a bottom plate; and a longitudinal plate erected between the side end and the center line in the front-rear direction, and the dimension in the left-right direction of the rear side portion of the side region is smaller than that of the front side portion of the side region. When viewed from above, the side region is a region formed between the longitudinal plate and the side end. The electric motor is configured in the front side portion of the side region, and the hydraulic pump is configured in the rear side portion of the side region. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 6 is a side view showing a hydraulic excavator according to a first embodiment of the present invention.

[0012] Figure 2 FIG. 10 is a plan view showing the internal structure of the upper swing body of the hydraulic excavator.

[0013] Figure 3 FIG. 14 is a plan view of the state after removing the battery unit and the working oil tank from Figure 2 FIG. 16 is a plan view of the state after removing the battery unit and the working oil tank.

[0014] Figure 4 FIG. 20 is a side view showing the internal structure of the upper swing body of the hydraulic excavator.

[0015] Figure 5 FIG. 24 is a rear view showing the internal structure of the upper swing body of the hydraulic excavator.

[0016] Figure 6 FIG. 28 is a schematic plan view showing the internal structure of the upper swing body of a hydraulic excavator according to a second embodiment of the present invention.

[0017] Figure 7 FIG. 32 is a schematic plan view showing the internal structure of the upper swing body of a hydraulic excavator according to a third embodiment of the present invention.

[0018] Figure 8 FIG. 36 is a schematic plan view showing the internal structure of the upper swing body of a hydraulic excavator according to a fourth embodiment of the present invention.

[0019] Figure 9 FIG. 40 is a schematic plan view showing the internal structure of the upper swing body of a hydraulic excavator according to a fifth embodiment of the present invention.

[0020] Figure 10 is a schematic top view showing the internal structure of the upper swing body of the hydraulic excavator according to the sixth embodiment of the present invention.

[0021] Figure 11 is a schematic top view showing the internal structure of the upper swing body of the hydraulic excavator according to the seventh embodiment of the present invention. Detailed Embodiments

[0022] A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

[0023] <First Embodiment>

[0024] Figure 1 is a side view of a hydraulic excavator 1 (construction machinery) according to the first embodiment of the present invention. Figure 2 is a top view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the present embodiment. Figure 2 Illustrations of various cover members and the like are omitted. Figure 3 is from Figure 2 a top view of the state after removing the battery unit 50 and the working oil tank 51. Figure 4 is a side view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1. Figure 5 is a rear view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1. In addition, the directions shown in each figure are represented based on the upper swing body 12 of the hydraulic excavator 1.

[0025] The hydraulic excavator 1 includes: a lower traveling body 10 (lower main body) that can travel on the ground G, an upper swing body 12 (machine body) that is rotatably mounted on the lower traveling body 10 about a rotation center axis extending in the vertical direction, and a working device 14 that is mounted on the upper swing body 12.

[0026] The lower traveling body 10 includes a pair of right crawlers 11R and left crawlers 11L that are respectively disposed on the right side and the left side. The right crawler 11R and the left crawler 11L each operate in such a manner that the lower traveling body 10 travels on the ground G.

[0027] The upper swing body 12 includes a swing frame 16 and a plurality of elements mounted on the swing frame 16. The plurality of elements include: a machinery room 17, a cab or cockpit 18, and a counterweight (not shown) that constitutes the rear end of the upper swing body 12.

[0028] The working device 14 includes a boom 21, an arm 22, and a bucket 24. The boom 21 is supported in a liftable manner at the front end of the slewing frame 16. The arm 22 is connected to the distal end portion of the boom 21 so as to be rotatable relative to the boom 21 in the vertical direction. The bucket 24 is a distal attachment device for performing excavation work and the like, and is attached to the distal end portion of the arm 22 so as to be rotatable relative to the arm 22 in the vertical direction. The cab 18 is disposed at the front end portion of the upper slewing body 12 and is located on the left side of the working device 14. Alternatively, the cab 18 may be disposed on the right side of the working device 14. The slewing frame 16 has a center line CL ( Figure 2 ) extending in the front-rear direction at the center in its left-right direction.

[0029] The hydraulic excavator 1 further includes a boom cylinder 26, an arm cylinder 27, and a bucket cylinder 28. The boom cylinder 26 expands and contracts to rotate the boom 21 in the lift direction. The arm cylinder 27 expands and contracts to rotate the arm 22 in the vertical direction. The bucket cylinder 28 expands and contracts to rotate the bucket 24 relative to the arm 22 in the vertical direction. These working cylinders are constituted by hydraulic cylinders.

[0030] The hydraulic excavator 1 further includes: a battery unit 50 ( Figure 2 ), a working oil tank 51, a control valve 52, an electric motor 53, a hydraulic pump 54 ( Figure 3 ), and a solenoid valve unit 55.

[0031] The battery unit 50 can store electricity and output the stored electric power. In the present embodiment, the battery unit 50 has a rectangular parallelepiped shape.

[0032] The working oil tank �1 is a box body that stores working oil inside. The working oil tank 51 receives the working oil discharged from the hydraulic circuit including the control valve 52, and on the other hand, supplies the working oil to the hydraulic pump 54.

[0033] The control valve 52 is disposed between the hydraulic actuators (the hydraulic cylinders, the slewing motor) provided in the hydraulic excavator 1 and the hydraulic pump 54, and the control valve 52 opens to control the supply path and flow rate of the working oil supplied to each actuator.

[0034] The electric motor 53 operates using the electric power supplied by the battery unit 50, rotates through its output shaft 53S (drive shaft) ( Figure 3 ), and transmits the driving force to the hydraulic pump 54. Alternatively, an inverter (not shown) may be disposed between the battery unit 50 and the electric motor 53.

[0035] The hydraulic pump 54 operates (rotates) using the driving force received from the electric motor 53, and discharges the working oil supplied to each actuator. The hydraulic pump 54 has a connected portion connected to the output shaft 53S of the electric motor 53, and receives the driving force at this connected portion.

[0036] The electromagnetic valve unit 55 ( Figure 3 ) is included in the hydraulic circuit for driving the respective actuators. The electromagnetic valve unit 55 has a plurality of valves, and the electromagnetic valve unit 55 opens the valves in response to a command signal received from a control unit (not shown).

[0037] As Figure 2 , Figure 3 shown, the swing frame 16 has a substantially rectangular shape in plan view. The swing frame 16 has: a bottom plate 160, a swing post 16S, a front wall 16P, a rear wall 16Q ( Figure 4 ), a left wall 161 (longitudinal plate), and a right wall 162.

[0038] The bottom plate 160 forms the main body portion of the swing frame 16 and is a plate-like portion facing upward and downward. The bottom plate 160 has: a frame front end portion 16F, a frame rear end portion 16B, a frame left end portion 16L (side end portion), and a frame right end portion 16R. The frame front end portion 16F is the front end portion of the bottom plate 160 and extends in the left-right direction. The frame rear end portion 16B is the rear end portion of the bottom plate 160 and extends in the left-right direction. The frame left end portion 16L is the left end portion (left side end portion) of the bottom plate 160 and extends in the front-rear direction. The frame right end portion 16R is the right end portion (right side end portion) of the bottom plate 160 and extends in the front-rear direction.

[0039] The swing post 16S is disposed to protrude forward from the central portion of the frame front end portion 16F. As Figure 4 shown, the swing post 16S has a pair of upper and lower support portions and rotatably supports Figure 1 the working device 14.

[0040] The front wall 16P ( Figure 4 ) is a wall portion erected on the bottom plate 160 along the frame front end portion 16F. Similarly, the rear wall 16Q is a wall portion erected on the bottom plate 160 along the frame rear end portion 16B.

[0041] The left wall 161 and the right wall 162 ( Figure 3 ) are erected on the bottom plate 160 so as to extend rearward from the base end portion of the swing post 16S. The left wall 161 is erected in the front-rear direction between the center line CL and the frame left end portion 16L, and the right wall 162 is erected in the front-rear direction between the center line CL and the frame right end portion 16R. In addition, the meaning of the above-mentioned erection in the front-rear direction is: at least extending in the front-rear direction. And, as Figure 3As shown, the left wall 161 and the right wall 162 are arranged to be substantially V-shaped in a top view, and the distance between them increases towards the rear. As a result, each wall portion including the left wall 161 and the right wall 162 can be used to maintain a relatively high rigidity and strength of the rotary frame 16.

[0042] In addition, in the present embodiment, the right wall 162 extends linearly in a top view. On the other hand, the left wall 161 has a curved shape. Specifically, the left wall 161 successively includes a first left wall 161A, a second left wall 161B, and a third left wall 161C from the front side. The first left wall 161A and the second left wall 161B are inclined rearward and laterally outward, and the inclination angle of the second left wall 161B is set to be greater than that of the first left wall 161A. The third left wall 161C is connected to the rear end of the second left wall 161B and extends in the front-rear direction. As a result, they are arranged in the order of the third left wall 161C, the second left wall 161B, and the first left wall 161A at positions farther from the center line CL in the left-right direction.

[0043] In addition, as Figure 4 shown, the upper end portion of the first left wall 161A gradually inclines downward towards the rear, the upper end portion of the second left wall 161B is connected to the upper end portion of the first left wall 161A and inclines more downward. The upper end portion of the third left wall 161C is connected to the upper end portion of the second left wall 161B, and after its height is substantially constant, it gradually extends upward. As described above, the upper end portion of the left wall 161 has a shape with a part cut off downward. As Figure 4 shown, the electric motor 53 and the hydraulic pump 54 are arranged facing the cut-off part.

[0044] Referring to Figure 3 , the area between the left wall 161 and the left end portion 16L of the frame in the rotary frame 16 is defined as the side area S. The front part of the side area S is defined as the front area S1, and the rear part of the side area S is defined as the rear area S2. Due to the inclined structure of the left wall 161 in a top view, the left-right dimension of the rear area S2 is set to be smaller than the left-right dimension of the front area S1.

[0045] In the present embodiment, the battery unit 50 is arranged on the rotary frame 16 at least on the left and right inner sides of the left wall 161 and coincides with the center line CL. In addition, as Figure 5 shown, the battery unit 50 is placed on a support structure provided on the bottom plate 160 and is supported at a position a certain distance above the bottom plate 160. The support structure includes Figure 3 the second left wall 161B, the third left wall 161C, and the rear part of the right wall 162. In addition, in Figure 5In this case, the electric motor 53 may also be disposed to protrude outward from the bottom plate 160. In this situation, the outer portion of the electric motor 53 is covered by a protection body (decorative panel), not shown, erected on the bottom plate 160.

[0046] The electric motor 53 is disposed in the front region S1 of the lateral region S, and the hydraulic pump 54 is disposed in the rear region S2 of the lateral region S. In other words, the electric motor 53 is disposed on the left and right outer sides of the second left wall 161B, and the hydraulic pump 54 is disposed on the left and right outer sides of the third left wall 161C. In addition, in the present embodiment, the output shaft 53S of the electric motor 53 extends in the front-rear direction, and the electric motor 53 and the hydraulic pump 54 are arranged in the front-rear direction.

[0047] As Figure 3 , Figure 5 shown, in the present embodiment, the width dimension (left-right width dimension, maximum dimension) of the hydraulic pump 54 in the left-right direction (width direction) is smaller than the width dimension of the electric motor 53. Therefore, by using the size relationship of the width dimensions of the electric motor 53 and the hydraulic pump 54, the electric motor 53 and the hydraulic pump 54 can be efficiently disposed in the lateral region S.

[0048] Referring to Figure 2 , Figure 4 , the above-described working oil tank 51 is disposed to the left (lateral side) of the battery unit 50 and above the hydraulic pump 54.

[0049] Moreover, the control valve 52 is disposed to face the electric motor 53 on the front side of the electric motor 53. In other words, the control valve 52 is disposed on the left and right outer sides of the first left wall 161A.

[0050] Referring to Figure 3 , Figure 5 , the electric motor 53 has an input portion 53A and a motor upper surface portion 53T. The input portion 53A is connected to a cable, not shown, extending from the battery unit 50 and receives power supply. The input portion 53A is disposed in a portion facing the inner side of the electric motor 53 in the left-right direction. As described above, since the electric motor 53 is disposed to face the cut-away portion of the left wall 161, the cable extending from the battery unit 50 can be easily connected to the input portion 53A through the cut-away portion.

[0051] The motor upper surface portion 53T of the electric motor 53 is the upper surface portion of the electric motor 53. On the other hand, the battery unit 50 has a unit lower surface portion 50S. The unit lower surface portion 50S is the lower surface portion of the battery unit 50. As Figure 5 described, the unit lower surface portion 50S of the battery unit 50 is disposed at a position lower than the motor upper surface portion 53T of the electric motor 53 on the rotary frame 16.

[0052] As described above, in the present embodiment, in order to maintain the high rigidity of the slewing frame 16, the left wall 161 is inclined more toward the left and right outer sides as it approaches the rear. Even in the structure where the rear region S2 of the lateral region S on the left and right outer sides of the left wall 161 is smaller than the front region S1 as described above, by using the size relationship of the left and right width dimensions of the electric motor 53 and the hydraulic pump 54 respectively, and arranging the electric motor 53 in the front region S1 and the hydraulic pump 54 in the rear region S2, the electric motor 53 and the hydraulic pump 54 can be compactly arranged in the limited space at the end of the slewing frame 16. As a result, interference of the electric motor 53 and the hydraulic pump 54 with the left wall 161 can be prevented, and the dimension in the width direction of the slewing frame 16 can be suppressed. In addition, by arranging the battery unit 50 at the center of the slewing frame 16 on the inner side in the left-right direction of the left wall 161, the risk of water ingress into the battery unit 50 can be reduced when the hydraulic excavator 1 is tilted or the like. In addition, the meaning of "the inner side in the left-right direction of the left wall 161" is that at least the battery unit 50 is arranged in the region between the center line CL in the front-rear direction passing through the center in the left-right direction of the slewing frame 16 and the left wall 161. In addition, the battery unit 50 may be arranged at least between the left wall 161 and the right wall 162 (between a pair of longitudinal walls).

[0053] In addition, in the present embodiment, since there is no need to provide a space for arranging the electric motor 53 and the hydraulic pump 54 below the battery unit 50, in order to ensure the battery capacity, the size of the battery unit 50 in the up-down direction can be increased.

[0054] Moreover, in the present embodiment, as Figure 3 shown, the hydraulic pump 54 is arranged in the rear region S2, and the solenoid valve unit 55 is arranged directly below the battery unit 50. Therefore, in Figure 3 , compared with the case where the positions of the electric motor 53 and the hydraulic pump 54 are reversed, the length of the pipe connecting the hydraulic pump 54 and the solenoid valve unit 55 can be shortened, thereby reducing the pressure loss in the pipe.

[0055] In addition, the electric motor 53 is arranged in the lateral region S below the battery unit 50 and offset from the battery unit 50. As a result, the unit lower surface portion 50S of the battery unit 50 can be arranged at a position lower than the motor upper surface portion 53T of the electric motor 53. Therefore, compared with the case where the electric motor 53 is arranged below the battery unit 50, the capacity of the battery unit 50 can be increased. Moreover, the capacity can also be increased by further adding a battery unit 50 above.

[0056] In addition, in the present embodiment, even in a structure where the front side portion of the electric motor 53 is occupied by the control valve 52, the electric motor 53 and the hydraulic pump 54 can be compactly arranged in the side region S by utilizing the size relationship of the left and right width dimensions of the electric motor 53 and the hydraulic pump 54 respectively.

[0057] Moreover, in the present embodiment, the working oil tank 51 can be efficiently arranged by utilizing the space on the side of the battery unit 50 and above the hydraulic pump 54. And since the working oil tank 51 is located directly above the hydraulic pump 54, the length of the flow path between the hydraulic pump 54 and the working oil tank 51 can be shortened. Also, the hydraulic piping can be made short and simple instead of being long and complex, so that costs can be suppressed and the assembly operation can be easily performed.

[0058] <Second Embodiment>

[0059] Figure 6 It is a schematic plan view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the second embodiment of the present invention. In addition, in the present embodiment, the description will be centered on the differences from the previous first embodiment. The same applies to the following embodiments.

[0060] In the present embodiment, the swing frame 16 further has a central wall 170 (opposing longitudinal plates), and has a left wall 171 and a right wall 172 instead of the left wall 161 and the right wall 162 of the previous first embodiment. The central wall 170 is a wall portion erected in the left-right direction at a substantially central portion in the front-rear direction of the swing frame 16 on the bottom plate 160.

[0061] The left wall 171 has a first left wall 171A and a second left wall 171B. In addition, the right wall 172 has a first right wall 172A and a second right wall 172B. As Figure 6 shown, each wall portion is inclined more and more toward the left and right outer sides as it approaches the rear. By the inclined structure of the second left wall 171B, the left and right width of the rear side region S2 of the side region S is set to be smaller than the left and right width of the front side region S1.

[0062] In the above structure, by arranging the electric motor 53 in the front side region S1 and the hydraulic pump 54 in the rear side region S2, the electric motor 53 and the hydraulic pump 54 can also be effectively arranged in the limited side region S.

[0063] In addition, even when the central wall 170 is disposed facing the electric motor 53 at a position in front of the electric motor 53 as in the present embodiment, by disposing the electric motor 53 in the front region S1 defined by the central wall 170 and the second left wall 171B, and disposing the hydraulic pump 54 in the relatively narrow rear region S2, the electric motor 53 and the hydraulic pump 54 can be compactly disposed in the side region S. Further, the electric motor 53 is surrounded by the central wall 170 and the second left wall 171B, so that vibration of the electric motor 53 can be suppressed from being transmitted to the front cockpit 18( Figure 1 ).

[0064] <Third Embodiment>

[0065] Figure 7 FIG. is a schematic plan view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the third embodiment of the present invention. In the present embodiment, the rear portion of the bottom plate 160 of the swing frame 16 is formed in a substantially arc shape. On the other hand, the second left wall 171B of the left wall 171 is provided so as to extend in the front-rear direction.

[0066] In this case, the left-right width of the rear region S2 of the side region S is also smaller than the left-right width of the front region S1. However, by utilizing the size relationship of the left-right width dimensions of the electric motor 53 and the hydraulic pump 54 respectively, by disposing the electric motor 53 in the front region S1 and disposing the hydraulic pump 54 in the rear region S2, the electric motor 53 and the hydraulic pump 54 can be compactly disposed in the limited space at the end of the swing frame 16. Further, similarly, in other embodiments of the present invention, the rear portion of the bottom plate 160 of the swing frame 16 may also be formed in a substantially arc shape.

[0067] <Fourth Embodiment>

[0068] Figure 8 FIG. is a schematic plan view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the fourth embodiment of the present invention. In the present embodiment, the shape of the left wall 171 is different from that of the previous second embodiment. Specifically, the left wall 171 has a first left wall 171A, a second left wall 171B, and a third left wall 171C. On the other hand, the right wall 172 has a first right wall 172A and a second right wall 172B. Further, the central wall 170 is disposed between the first left wall 171A and the second left wall 171B, and between the first right wall 172A and the second right wall 172B.

[0069] The first left wall 171A and the first right wall 172A are inclined such that the distance between them increases as they get closer to the rear. The front end portion of the second left wall 171B is located slightly inside in the left - right direction with respect to the rear end portion of the first left wall 171A. Moreover, the second left wall 171B is inclined outward in the left - right direction at an angle greater than that of the first left wall 171A. The third left wall 171C connected to the second left wall 171B extends in the front - rear direction. As a result, as Figure 8 shown, a wedge - shaped (triangular) region defined by the central wall 170 and the second left wall 171B is formed on the slewing frame 16, and this region corresponds to the front - side region S1 of the present embodiment. On the other hand, although the width in the left - right direction of the rear - side region S2 is smaller than the width in the left - right direction of the front - side region S1, it is substantially constant in the front - rear direction.

[0070] In the present embodiment, an electric motor 53 is disposed in the front - side region S1 as described above, and a hydraulic pump 54 is disposed in the rear - side region S2, and the electric motor 53 and the hydraulic pump 54 are arranged in the front - rear direction. Therefore, by utilizing the size relationship of the left - right width dimensions of the electric motor 53 and the hydraulic pump 54 respectively, the electric motor 53 and the hydraulic pump 54 can be compactly arranged even in the limited space at the end of the slewing frame 16.

[0071] In addition, in the present embodiment, by shifting the front end portion of the second left wall 171B inward in the left - right direction, the wedge - shaped region is formed, and the electric motor 53 is disposed by being inserted into this region. Moreover, compared with the case where the front end portion of the second left wall 171B is connected to the rear end portion of the first left wall 171A, in the second left wall 171B inclined as described above, the region (length) for supporting the battery unit 50 from below is increased. Therefore, the battery unit 50 can be stably supported, and the stability of the slewing frame 16 can be improved. Also, the stability of the battery unit 50 in the region around the electric motor 53 and the hydraulic pump 54 where vibration is likely to be generated to the battery unit 50 can be improved.

[0072] <Fifth Embodiment>

[0073] Figure 9 is a schematic plan view showing the internal structure of the upper slewing body 12 of the hydraulic excavator 1 according to the fifth embodiment of the present invention. In the present embodiment, the slewing frame 16 has the same left wall 171 and right wall 172 as those of the previous second embodiment. On the other hand, the arrangement mode of the electric motor 53 and the hydraulic pump 54 is different from that of the second embodiment. Specifically, the electric motor 53 and the hydraulic pump 54 are inclined and arranged in the side region S with respect to the front - rear direction such that the output shaft 53S of the electric motor 53 (refer to Figure 3 ) gets farther away from the center line CL as it goes farther to the rear. In this case, as Figure 9As shown, the electric motor 53 and the hydraulic pump 54 are arranged along the second left wall 171B. Therefore, interference of the electric motor 53 and the hydraulic pump 54 with respect to the second left wall 171B can be prevented. In addition, based on the size relationship of the left and right width dimensions of the electric motor 53 and the hydraulic pump 54 respectively, the electric motor 53 and the hydraulic pump 54 can be compactly arranged within the V-shaped area of the front side area S1 and the rear side area S2 in a top view.

[0074] In other words, in the present embodiment, since the rear part of the second left wall 171B is located on the left and right outer sides of the front part of the second left wall 171B, the rear side area S2 of the side area S is set to be relatively narrow. Correspondingly, the output shaft 53S of the electric motor 53 is inclined, and the hydraulic pump 54 is inclined and arranged accordingly. Thereby, the electric motor 53 and the hydraulic pump 54 can be compactly arranged within a limited space.

[0075] <Sixth Embodiment>

[0076] Figure 10 It is a schematic top view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the sixth embodiment of the present invention. In the present embodiment, compared with the previous second embodiment, the second left wall 171B is inclined more greatly to the left and right outer sides, which is different from the second embodiment in this regard. In this case, as Figure 10 shown, in a top view, the rear end corner 54T on the right side of the hydraulic pump 54 overlaps with the second left wall 171B. Actually, in the present embodiment, similar to Figure 4 the upper end portion of the third left wall 161C shown, Figure 10 the upper end portion of the second left wall 171B is arranged at a position lower than the rear end corner 54T. As a result, interference between the rear end portion (protruding portion) of the hydraulic pump and the second left wall 171B can be suppressed.

[0077] In other words, to summarize the positional relationship of the components in the present embodiment, the hydraulic pump 54 has a rear end corner 54T (protruding portion) protruding from the side area S toward the center line CL side. On the other hand, the second left wall 171B has: a first upper end portion, and a second upper end portion arranged at a position lower than the first upper end portion and located below the rear end corner 54T. In this case, the first upper end portion is the front part of the second left wall 171B, and the second upper end portion is the part located below the rear end corner 54T of the second left wall 171B.

[0078] In addition, when viewed from above, the part that overlaps with the second left wall 171B and is located above the upper end of the second left wall 171B may also be part of the electric motor 53. Additionally, it is also possible that the height of the second left wall 171B is constant and set lower than the height of the first left wall 171A. In this case, the upper end of the second left wall 171B corresponds to the second upper end of the present invention, and the upper end of the first left wall 171A corresponds to the first upper end of the present invention.

[0079] <Seventh Embodiment>

[0080] Figure 11 FIG. is a schematic top view showing the internal structure of the upper swing body 12 of the hydraulic excavator 1 according to the seventh embodiment of the present invention. In the present embodiment, the left wall 171 and the right wall 172 are inclined in the same manner as in the previous second embodiment ( Figure 6 ). On the other hand, the battery unit 50 is arranged at a rearward position. In addition, the front end of the battery unit 50 is arranged behind the electric motor 53. Moreover, the left end of the battery unit 50 extends to the outside of the second left wall 171B and is arranged overlappingly above the hydraulic pump 54. In this case, a part of the second left wall 171B may also be cut off downward so as to avoid the battery unit 50. According to such a structure, the space above the hydraulic pump 54 can be utilized, and a part of the battery unit 50 can be efficiently arranged. Additionally, in Figure 11 the above-mentioned working oil tank 51 may be arranged adjacent to the battery unit 50 above the hydraulic pump 54, or the working oil tank 51 may be arranged at another position.

[0081] According to the structure of the present embodiment, the same effects as those of the previous first embodiment can also be achieved. Moreover, through Figure 11 such an arrangement of the battery unit 50, the space in front of the battery unit 50 can be ensured, and thus, other devices can be arranged using this space.

[0082] In addition, in the present embodiment, by arranging the lower surface of the battery unit 50 at a position lower than the upper surface of the electric motor 53, the capacity of the battery unit 50 can also be ensured. Additionally, Figure 11 in the case where the capacity of the battery unit 50 is relatively small, the lower surface of the battery unit 50 may also be located above the upper surface of the electric motor 53.

[0083] In addition, in the present embodiment, as Figure 11 shown, by arranging the battery unit 50 at the rear, the battery unit 50 can be stably supported in the region where the interval between the left wall 171 and the right wall 172 is large.

[0084] The present invention is not limited to the above-described embodiments. The present invention may also be a combination of the solutions in the above-described embodiments.

[0085] In addition, in each of the above-described embodiments, the left end portion 16L of the bottom plate 160 of the swing frame 16 is taken as an example of the side end portion of the swing frame 16. However, the side end portion of the swing frame 16 may be constituted by a member different from the bottom plate 160. As an example, the inner side surface of a protective body (decorative panel) (not shown) erected on the bottom plate 160 may constitute the side end portion of the present invention. In this case, in a plan view, the side region S described above is formed between the inner side surface of the protective body and the left wall 161 (vertical plate).

[0086] In addition, in the above-described embodiment, the manner in which the battery unit 50 is disposed on the inner side in the left-right direction of the left wall 161 is described. However, various other manners can also be adopted for the arrangement of the battery unit 50. For example, Figure 11 the battery unit 50 is moved to the right, and its left end is disposed more to the right than the left wall 171, and its right end is disposed near the right end portion 16R of the frame.

[0087] In addition, in Figure 11 , the battery unit 50 may also be disposed so as to cover the hydraulic pump 54. At this time, the left end of the battery unit 50 may be disposed near the left end portion 16L of the frame, and the right end of the battery unit 50 may be disposed near the center line CL.

[0088] In addition, in other manners, the battery unit 50 may be disposed so as to coincide with the T-shaped portion of the center wall 170 and the second right wall 172B on the right side of the center line CL. At this time, the length of the battery unit 50 in the front-rear direction may also be greater than the sum of the lengths of the electric motor 53 and the hydraulic pump 54 in the front-rear direction.

[0089] In addition, in Figure 1 , a mini excavator is cited as a hydraulic excavator, but the construction machinery to which the present invention is applicable is not limited thereto, and it may be a medium or large excavator, or construction machinery other than an excavator.

[0090] The present invention provides an electro-hydraulic construction machine. The construction machine includes: a swing frame having a center line extending in the front-rear direction; a battery unit configured on the swing frame; an electric motor that operates using the power supplied by the battery unit; and a hydraulic pump having a width dimension in the left-right direction in a top view smaller than the width dimension of the electric motor, the hydraulic pump receiving the driving force of the electric motor and discharging working oil, wherein the swing frame includes: one of the left and right side ends; a bottom plate; and a vertical plate erected in the front-rear direction between the side end and the center line, and the left-right dimension of the rear side portion of the side region is smaller than the dimension of the front side portion of the side region, and in a top view, the side region is a region formed between the vertical plate and the side end, the electric motor is configured in the front side portion of the side region, and the hydraulic pump is configured in the rear side portion of the side region.

[0091] According to this structure, even in a structure where the rear side portion of the side region on the left and right outer sides of the vertical plate is smaller than the front side portion, by utilizing the size relationship of the left and right width dimensions of the electric motor and the hydraulic pump respectively, by arranging the electric motor in the front side portion of the side region and the hydraulic pump in the rear side portion of the side region, it is possible to compactly arrange the electric motor and the hydraulic pump in the limited space at the end of the swing frame.

[0092] In addition, since there is no need to provide a space for arranging the electric motor and the hydraulic pump below the battery unit, therefore, in order to ensure the capacity of the battery, its size in the up-down direction can also be increased.

[0093] In the above structure, it may also be that the battery unit is at least more inward in the left-right direction than the vertical plate.

[0094] According to this structure, by arranging the battery unit at the central part of the swing frame, the risk of water ingress into the battery unit can be reduced when the construction machine is tilted or the like.

[0095] In the above structure, the electric motor has an upper surface portion, and the battery unit has a lower surface portion, and the lower surface portion is arranged at a position lower than the upper surface portion of the electric motor on the swing frame.

[0096] According to this structure, the electric motor is arranged in the side region offset from below the battery unit, whereby the lower surface portion of the battery unit can be arranged at a position lower than the upper surface portion of the electric motor. Therefore, compared with the case where the electric motor is arranged below the battery unit, the capacity of the battery unit can be increased.

[0097] In the above structure, it is also possible that at least one of the electric motor and the hydraulic pump has a protruding portion that protrudes from the side region toward the center line side, and the vertical plate has a first upper end portion and a second upper end portion that are arranged at a position lower than the first upper end portion and are located below the protruding portion.

[0098] According to this structure, it is possible to suppress interference of the protruding portion of at least one of the electric motor and the hydraulic pump with the vertical plate.

[0099] In the above structure, it is also possible that the rear side portion of the vertical plate is arranged at a position farther from the center line in the left - right direction than the front side portion of the vertical plate. The electric motor has an output shaft, and the hydraulic pump has a connected portion connected to the output shaft. The electric motor and the hydraulic pump are inclinedly arranged in the side region with respect to the front - rear direction such that the output shaft is farther from the center line as it goes rearward.

[0100] According to this structure, since the rear side portion of the vertical plate is located on the left - right outer sides of the front side portion of the vertical plate, the rear side portion of the side region is set to be relatively narrow. Correspondingly, by arranging the output shaft of the electric motor obliquely, it is possible to compactly arrange the electric motor and the hydraulic pump in a limited space.

[0101] In the above structure, it may further include a control valve that is arranged facing the electric motor on the front side of the electric motor and receives the working oil ejected from the hydraulic pump.

[0102] According to this structure, even in a structure where the front side portion of the electric motor is occupied by the control valve, by utilizing the size relationship of the left - right width dimensions of the electric motor and the hydraulic pump respectively, it is possible to compactly arrange the electric motor and the hydraulic pump in the side region.

[0103] In the above structure, it is also possible that the rotary frame further includes opposing vertical plates that are erected in the left - right direction and are arranged facing the electric motor on the front side of the electric motor.

[0104] According to this structure, even in a structure where the front side portion of the electric motor is occupied by the opposing vertical plates, by utilizing the size relationship of the left - right width dimensions of the electric motor and the hydraulic pump respectively, it is possible to compactly arrange the electric motor and the hydraulic pump in the side region. As a result, by arranging the opposing vertical plates, it is possible to maintain a relatively high rigidity and strength of the rotary frame.

[0105] In the above structure, it may further include a working oil tank that is arranged on the side of the battery unit and above the hydraulic pump and is used for storing the working oil supplied to the hydraulic pump.

[0106] According to this structure, the space above the side of the battery unit and above the hydraulic pump can be utilized to efficiently arrange the working oil tank. Moreover, the length of the flow path between the hydraulic pump and the working oil tank can be shortened. Also, the hydraulic piping can be made short and simple instead of being long and complex, so that the cost can be suppressed and the assembly operation can be easily performed.

[0107] In the above structure, it may also be that, in a plan view, one of the left and right ends of the battery unit is arranged to overlap with the hydraulic pump.

[0108] According to this structure, the space above the hydraulic pump can be utilized to efficiently arrange a part of the battery unit.

[0109] As described above, the present invention provides an electro-hydraulic construction machine that can compactly arrange an electric motor and a hydraulic pump even in a limited space at the end of the swing frame.

Claims

1. An electro-hydraulic construction machinery, characterized in that Comprising: A slewing frame having a center line extending in the front-rear direction; A battery unit configured on the slewing frame; An electric motor that operates using the power supplied by the battery unit; And A hydraulic pump having a width dimension in the left-right direction in a top view smaller than the width dimension of the electric motor, the hydraulic pump receiving the driving force of the electric motor and discharging working oil, wherein The slewing frame includes: one of the left and right side ends; a bottom plate; and a longitudinal plate standing in the front-rear direction between the side end and the center line, and the left-right dimension of the rear side portion of the side region is smaller than the dimension of the front side portion of the side region. In a top view, the side region is a region formed between the longitudinal plate and the side end, The electric motor is configured in the front side portion of the side region, and the hydraulic pump is configured in the rear side portion of the side region.

2. The electro-hydraulic construction machine according to claim 1, characterized in that: The battery unit is at least more inward in the left-right direction than the longitudinal plate.

3. The electro-hydraulic construction machine according to claim 1 or 2, characterized in that: The electric motor has an upper surface portion, The battery unit has a lower surface portion, and the lower surface portion is disposed at a position lower than the upper surface portion of the electric motor on the slewing frame.

4. The electro-hydraulic construction machine according to any one of claims 1 to 3, characterized in that: At least one of the electric motor and the hydraulic pump has a protruding portion protruding from the side region toward the center line side, The longitudinal plate has: a first upper end portion and a second upper end portion disposed at a position lower than the first upper end portion and located below the protruding portion.

5. The electro-hydraulic construction machine according to any one of claims 1 to 4, characterized in that: The rear side portion of the longitudinal plate is disposed at a position farther from the center line in the left-right direction than the front side portion of the longitudinal plate, The electric motor has an output shaft, and the hydraulic pump has a connected portion connected to the output shaft, The electric motor and the hydraulic pump are inclinedly disposed in the side region with respect to the front-rear direction such that the output shaft is farther from the center line as it goes rearward.

6. The electro-hydraulic construction machinery according to any one of claims 1 to 5, characterized in that Further comprising: A control valve disposed opposite to the electric motor on the front side of the electric motor and receiving the working oil discharged by the hydraulic pump.

7. The electro-hydraulic construction machine according to any one of claims 1 to 6, characterized in that: The slewing frame further includes an opposing longitudinal plate that stands in the left-right direction and is disposed opposite to the electric motor on the front side of the electric motor.

8. The electro-hydraulic construction machinery according to any one of claims 1 to 7, characterized in that Further comprising: A working oil tank disposed on the side of the battery unit and above the hydraulic pump for storing the working oil supplied to the hydraulic pump.

9. The electro-hydraulic construction machine according to any one of claims 1 to 8, characterized in that: In a top view, one of the left and right ends of the battery unit is disposed to coincide with the hydraulic pump.

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