CN111226006A

CN111226006A - Work vehicle and vehicle charging system

Info

Publication number: CN111226006A
Application number: CN201980000245.5A
Authority: CN
Inventors: 富泽美帆; 高野善之
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 2018-09-20
Filing date: 2019-01-23
Publication date: 2020-06-02
Also published as: JP2020045702A; WO2020059163A1; JP7213045B2; DE112019000009T5

Abstract

The invention provides a work vehicle and a vehicle charging system. The work vehicle is provided with a charging port (140) which can be accessed from the outside, the charging port (140) is provided with a common charging connector (160A) and a quick charging connector (160B), the common charging connector (160A) and the quick charging connector (160B) can be respectively connected with a common charging connector (170A) and a quick charging connector (170B) which are connected with an external power supply from end parts (161A, 161B), and are arranged adjacently and side by side, and the end part (161A) of the common charging connector (160A) and the end part (161B) of the quick charging connector (160B) are mutually opposite in the side by side arrangement direction of the common charging connector (160A) and the quick charging connector (160B).

Description

Work vehicle and vehicle charging system

Technical Field

The present invention relates to a work vehicle and a vehicle charging system.

The present application claims priority based on patent application No. 2018-176017 filed in japan on 9, 20, 2018, the contents of which are incorporated herein by reference.

Background

Patent document 1 has disclosed an electric construction work machine having a plurality of couplers (connection members) to which an external power supply is connected. The plurality of couplers are arranged side by side with each other. The plurality of couplers are configured such that only one of the coupling members is opened to the outside by a sliding plate slidable in the direction of arrangement.

Documents of the prior art

Patent document

Patent document 1: japanese unexamined patent publication No. 2012-1889

Disclosure of Invention

Technical problem to be solved by the invention

However, in the solution of patent document 1, since the slide plate is movable, the frequency of maintenance increases as a result of wear or the like of the slide plate.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a work vehicle and a vehicle charging system that can improve maintainability while avoiding simultaneous connection of an external power supply and a plurality of couplers.

Technical solution for solving technical problem

A work vehicle according to one aspect of the present invention includes: the charging port has an end portion facing the outside, and has a first coupler and a second coupler which are provided adjacent to each other and to which connectors connected to an external power supply are connectable from the end portion side, respectively, and the end portion of the first coupler and the end portion of the second coupler are opposed to each other in a direction in which the first coupler and the second coupler are provided in parallel.

A vehicle charging system according to an aspect of the present invention includes: the work vehicle comprises the work vehicle, a common charging connector and a quick charging connector, wherein the common charging connector is connected with the common charging connector, the quick charging connector is used for preventing the quick charging connector from being connected with the quick charging connector, and the quick charging connector is used for preventing the quick charging connector from being connected with the common charging connector when the quick charging connector is connected with the quick charging connector.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the work vehicle and the vehicle charging system of the above-described aspect, the maintenance performance can be improved while avoiding simultaneous connection of the external power supply and the plurality of couplers.

Drawings

Fig. 1 is a side view of an electric hydraulic excavator according to an embodiment of the present invention.

Fig. 2 is a schematic plan view showing an internal structure of an upper swing body of an electric hydraulic excavator according to an embodiment of the present invention.

Fig. 3 is a schematic side view showing the internal structure of the rear part and the upper part of the upper swing body of the electric hydraulic excavator according to the embodiment of the present invention.

Fig. 4 is a plan view of a charging port of the electric hydraulic excavator according to the embodiment of the present invention.

Fig. 5 is a perspective view of a charging port of the electric hydraulic excavator according to the embodiment of the present invention.

Detailed Description

The following describes embodiments of the present invention in detail with reference to fig. 1 to 5.

< electric Hydraulic excavator (electric engineering work machine) >

As shown in fig. 1, an electric excavator 200 as an example of an electric construction work machine includes a lower traveling structure 210 and an upper swing structure (vehicle body) 220. Hereinafter, a direction in which gravity acts in a state in which the electric hydraulic excavator 200 is installed on a horizontal plane is referred to as an up-down direction.

< lower traveling body >

Lower carrier 210 has a pair of crawler belts 211. The lower traveling structure 210 travels by driving the crawler belt 211 by a traveling hydraulic motor (not shown). The traveling direction of the lower traveling structure 210 is referred to as the front-rear direction, the front side in the traveling direction (the side in which the below-described blade 212 is provided in the normal traveling direction) is referred to as the front, and the rear side in the traveling direction, which is the opposite side of the front side, is referred to as the rear side. In addition, the right side is referred to as "right" and the left side is referred to as "left" when viewed from the forward direction. The crawler belts 211 are provided in a pair on the left and right.

A blade 212 as a blade extending in the vehicle width direction (hereinafter simply referred to as the width direction) of the lower traveling structure 210 is provided at the front portion of the lower traveling structure 210. The blade 212 can be driven by a hydraulic cylinder to adjust the height position.

< upper rotating body >

The upper rotating body 220 is provided on the lower traveling body 210. The upper rotating body 220 is connected to the lower traveling body 210 via a swing ring 215. The swinging ring 215 is formed in an annular shape centering on a rotation axis extending in the vertical direction. The upper rotating body 220 is rotatable about the rotation axis with respect to the lower traveling body 210 by the swing ring 215.

The upper rotating body 220 includes: the working device 221, the driving space 80, the revolving frame 10, the gate frame 20, the battery unit 40, the inverter 36, the power transmission unit 37, the electric motor 39, the hydraulic pump 51, the hydraulic valve 52, the operation mode switching unit 53, the revolving motor 70, the cooling unit 61, the auxiliary equipment battery 64, the protection device 95, the exterior cover 100, and the charging port 140.

< working device >

As shown in fig. 1, the working device 221 includes: big arm 222, small arm 223, and bucket 224. The work implement 221 drives the boom 222, the arm 223, and the bucket 224 by the respective hydraulic cylinders, thereby performing various operations such as excavation. Hereinafter, the width direction of the upper swing body 220 in a state where the working device 221 is directed forward of the electric hydraulic excavator 200 is simply referred to as "width direction". A direction toward the center in the width direction is referred to as "inside in the width direction", and a direction toward the left side (one side in the width direction) or the right side (the other side in the width direction) from the center in the width direction is referred to as "outside in the width direction".

< Driving space >

The driving space 80 is a portion on which the operator gets and in which the operator performs the operation of the electric hydraulic excavator 200. As shown in fig. 1, the driving space 80 is provided in the front portion of the upper rotating body 220 and in the upper left portion

The driving space 80 includes: a floor 81 forming a floor surface, and an operator's seat 84 provided rearward and above the floor 81. In addition, a console box for storing a control device and the like, various levers, and pedals are provided in the driving space 80. The upper side of the driving space 80 is covered with a roof 90. The rear portion of the top cover 90 is fixed to the upper end of the gate frame 20.

< rotating frame >

As shown in fig. 2, the rotating frame 10 has: a bottom plate 11, a transverse partition plate 12, a front longitudinal partition plate 13, a front reinforcing plate 14, a bracket 15, and a rear longitudinal partition plate 16 as a spacer.

< bottom plate >

As shown in fig. 2, the bottom plate 11 is a plate-shaped member extending in the horizontal direction. That is, the bottom plate 11 extends in the front-rear direction and the width direction. The lower surface of the base plate 11 is fixed to the swing ring 215. Thereby, the rotating frame 10 is supported from below by the swing ring 215.

< transverse partition >

The horizontal partition plate 12 is a plate-like member that protrudes upward from the upper surface of the bottom plate 11 and extends in the width direction. The transverse partition 12 extends with the width direction as the longitudinal direction. The lateral partition 12 is disposed in a portion of the bottom plate 11 on the front side of the center in the front-rear direction. The transverse partition plates 12 extend across both ends in the width direction of the bottom plate 11, that is, both ends on the left and right.

< front longitudinal partition >

The front longitudinal partition 13 is a plate-like member that protrudes from the upper surface of the bottom plate 11 and extends in the front-rear direction. The front vertical partition 13 is provided in a pair spaced apart from each other in the width direction on the upper surface of the bottom plate 11 on the front side of the horizontal partition 12. That is, the pair of front vertical partitions 13 is provided at the left and right with a space therebetween. The pair of front vertical partitions 13 are disposed on the inner side in the width direction of the end portions of the bottom plate 11 on both sides in the width direction.

The rear end of the front longitudinal partition 13 is connected to a front surface of the transverse partition 12. That is, the front vertical partition 13 extends forward from the horizontal partition 12. As shown in fig. 2, the pair of front vertical partitions 13 are disposed so as to approach each other from the rear end, which is the connection position with the horizontal partition 12, toward the front side.

< front reinforcing plate >

The front reinforcing plate 14 is fixed integrally with the pair of front longitudinal partition plates 13 at the front of the pair of front longitudinal partition plates 13.

< support >

The bracket 15 is fixed to the front ends of the pair of front longitudinal partition plates 13 and the front reinforcing plate 14. The working device 221 is supported by the base plate 11 via the bracket 15.

< rear longitudinal partition >

The rear longitudinal partition 16 is a plate-like member that protrudes from the upper surface of the bottom plate 11 and extends in the front-rear direction. The rear vertical partitions 16 are provided in a pair spaced apart from each other in the width direction on the upper surface of the bottom plate 11 on the rear side of the horizontal partitions 12. That is, the rear vertical partition 16 is provided in a pair on the left and right. The width-directional interval of the pair of rear longitudinal partition walls 16 is larger than the width-directional interval of the pair of front longitudinal partition walls 13 at the rear ends of the front longitudinal partition walls 13.

< door type frame >

As shown in fig. 2, the gate frame 20 is fixed to the base plate 11. The gate frame 20 includes a pair of pillar portions 21 and a beam portion 22.

The pair of pillar portions 21 is provided rearward of the transverse partition 12 on the bottom plate 11, and is separated in the width direction. The column portion 21 extends in the vertical direction, and the lower end is fixed to the bottom plate 11.

The beam portion 22 extends in the width direction across the upper ends of the pair of pillar portions 21. The beam 22 is provided above and spaced apart from the upper surface of the base plate 11. The pair of column portions 21 is fixed integrally with the beam portion 22. The gate frame 20 is formed in an inverted U shape when viewed from the front-rear direction.

< cell >

The battery unit 40 is a power source of the electric hydraulic excavator 200. As shown in fig. 2, the battery unit 40 is disposed near the center of the rear portion on the bottom plate 11. The battery cells 40 are arranged on a pair of rear longitudinal separators 16. The battery unit 40 is configured to be inserted through the door frame 20. As shown in fig. 2 and 3, the battery unit 40 includes a battery case 41 and a sensor case 44.

< Battery case >

The battery case 41 houses a large number of batteries therein. As shown in fig. 3, the battery case 41 is constructed by stacking a plurality of battery cartridges 42 in the up-down direction. A plurality of batteries are arranged inside the plurality of battery cases 42. The plurality of batteries disposed in each battery case 42 are electrically connected to the entire battery case 41, thereby constituting a battery circuit.

< sensor case >

The sensor case 44 is provided to protrude further rearward from the rear surface of each battery case 42. The sensor case 44 is formed in a box shape extending in the width direction. Various sensors, contactors, and the like are housed inside the sensor box 44. The uppermost sensor case 44 is provided with a service plug 44a projecting rearward from the sensor case 44. By pulling out the service plug 44a, the battery circuit of the battery unit 40 is cut off.

< inverter >

As shown in fig. 2 and 3, the inverter 36 is provided above the battery box 41 of the battery unit 40. More specifically, the inverter 40 is supported by a bracket 36a formed in a frame shape fixed to the upper surface of the battery case 41. The inverter 36 converts the dc power supplied from the battery unit 40 into ac power.

< Power Transmission Unit >

As shown in fig. 2, the power transmission unit 37 is disposed on the right side of the battery unit 40. The power transmission unit 37 supplies the inverter 36 with the dc power that has been charged in the battery unit 40. That is, the dc power from the battery unit 40 is supplied to the inverter 36 via the power transmission unit 37. The power transmission unit 37 is provided with various electronic devices such as a contactor, a DC-DC converter, and an in-vehicle charger.

< electric Motor >

The electric motor 39 is driven by the ac power supplied from the inverter 36. As shown in fig. 2, the electric motor 39 is disposed on the left side of the battery unit 40. The electric motor 39 is provided to drive the shaft in the front-rear direction.

< Hydraulic Pump >

The hydraulic pump 51 is driven in accordance with the rotation of the drive shaft of the electric motor 39, and discharges the hydraulic oil. As shown in fig. 2, the hydraulic pump 51 is provided on the base plate 11 in front of the electric motor 39 and near the front-rear position of the lateral partition plate 12. The hydraulic pump 51 is disposed such that the rotation axis is along the front-rear direction. The rotation shaft of the hydraulic pump 51 is connected to the drive shaft of the electric motor 39.

< Hydraulic valve >

As shown in fig. 2, the hydraulic valve 52 is provided on the bottom plate 11 on the left side of the front longitudinal partition 13 and on the front side of the lateral partition 12. The hydraulic valve 52 is connected to the hydraulic pump 51. The hydraulic valve 52 distributes the hydraulic oil discharged from the hydraulic pump 51 to various hydraulic devices such as hydraulic cylinders.

< operation mode switching part >

The operation mode switching unit 53 is connected to the hydraulic valve 52, and changes the setting by a maintenance worker to change the destination to which the hydraulic oil is distributed by the hydraulic valve 52. Thus, the movable hydraulic cylinder is changed by various lever operations of the driver. As a result, the operation mode of the various lever operations by the driver can be switched.

As shown in fig. 2, the operation mode switching portion 53 is disposed on the left side (outer side in the width direction) of the hydraulic valve 52 in a plan view.

< rotating Motor >

The rotation motor 70 is a hydraulic drive motor that is rotationally driven by the hydraulic oil supplied from the hydraulic valve 52. The rotary motor 70 is provided to penetrate the bottom plate 11 at a position between the pair of front vertical partitions 13 of the bottom plate 11. The axis of the rotary shaft of the rotary motor 70 coincides with the vertical direction. The rotation motor 70 is driven by hydraulic pressure, and thus the driving force of the rotation motor 70 is transmitted to the swing ring 215 via a swing pinion gear not shown. Thereby, the upper rotating body 220 is rotationally driven with respect to the lower traveling body.

< Cooling Unit >

As shown in fig. 2, the cooling unit 61 is provided in a region on the front side of the transverse partition 12 and on the right side of the front longitudinal partition on the right side. The cooling unit 61 has: a cooling fan 62 driven to rotate, and a heat exchanging portion 63 including a radiator and an oil cooler.

< auxiliary device Battery >

As shown in fig. 2, the auxiliary equipment battery 64 is disposed below the cooling unit 61 on the bottom plate 11. The auxiliary equipment battery 64 supplies electric power to auxiliary equipment such as a vehicle lamp and various control devices. The auxiliary equipment battery 64 is charged via the DC-DC converter of the power transmission unit 37.

As shown in fig. 2, the oil tank 65 is disposed in front of the cooling unit 61. The oil tank 65 stores hydraulic oil supplied to the hydraulic motor.

< protection device >

As shown in fig. 1, a pair of protectors 95 is provided at both corners of the rear and lower portion of the upper rotating body 220 with a gap therebetween in the width direction. The protector 95 is made of a high-strength material such as steel. The protector 95 is integrally fixed to the corner portions on both sides of the rear end of the bottom plate 11 and extends upward. The protector 95 protects the upper rotating body 220 from an impact in the event of a rear collision when the upper rotating body 220 rotates.

< exterior cover body >

As shown in fig. 1, outer covering body 100 is a cover body that forms the outer shape of upper rotating body 220. Various devices of the upper rotating body 220 are housed inside the housing body 100. The outer cover 100 includes: left housing 120, right housing 130, and rear housing 110.

As shown in fig. 1 and 2, the left cover 120 forms a left side portion of the outer cover 100. As shown in fig. 2, the left cover 120 covers the hydraulic pump 51, the hydraulic valve 52, and the operation mode switching unit 53 from the left side.

As shown in fig. 1 and 2, right cover 130 forms the right side portion of outer cover 100. The right cover 130 covers the cooling unit 61, the auxiliary equipment battery 64, and the oil tank 65. The right cover 130 has: an intake hole (not shown) for introducing air into the cooling unit 61, and an exhaust hole (not shown) for discharging air that has passed through the cooling unit 61.

< rear cover >

As shown in fig. 1 and 2, rear cover 110 forms the rear of exterior cover 100. As shown in fig. 2, the rear cover 110 houses and covers the battery unit 40, the inverter 36, the power transmission unit 37, and the electric motor 39.

As shown in fig. 3, rear cover 110 has opening/closing unit 111. Opening/closing unit 111 is a portion that contacts the rear end and the upper end of rear cover 110, and is provided at the center in the width direction. Opening/closing unit 111 is provided at the upper end of rear cover 110 so as to be rotatable about a rotation axis O along the width direction.

< charging port >

As shown in fig. 2 and 3, the charging port 140 is provided at the rear of the upper surface of the battery case 41 of the battery unit 40. More specifically, as shown in fig. 3, the charging port 140 is supported on the rear end of the bracket 36 a. Charging port 140 is disposed at a position accessible from the outside by opening/closing unit 111 of rear cover 110.

As shown in fig. 4 and 5, the charging port 140 includes: a base 150, a normal charging coupler 160A as a first coupler, and a quick charging coupler 160B as a second coupler.

< basal part >

The base 150 is fixed to the rear end of the bracket 36 a. The base 150 has a first flat surface 151A and a second flat surface 151B facing the outside of the upper rotating body on the rear side. The first plane 151A and the second plane 151B are arranged side by side in the width direction of the upper rotating body 220.

The first flat surface 151A and the second flat surface 151B are connected to each other so as to be recessed inward toward the front side of the upper rotating body 220. Thus, the first plane 151A and the second plane 151B face each other in the parallel arrangement direction.

Here, "the first plane 151A and the second plane 151B face" also includes a state where the first plane 151A and the second plane 151A are inclined to face each other.

< first plane >

The first plane 151A is provided on one side in the parallel arrangement direction (the upper side in fig. 4, one side in the vehicle width direction).

The first plane 151A extends rearward from the connection position of the first plane 151A and the second plane 151B toward the right.

< second plane >

The second plane 151B is provided on the other side in the parallel arrangement direction (the lower side in fig. 4, the other side in the vehicle width direction).

The second plane 151B extends rearward from the connection position between the first plane 151A and the second plane 151B toward the left side.

The angle θ formed by the first plane 151A and the second plane 151B is set, for example, in the range of 130 ° to 170 °, preferably in the range of 140 ° to 160 °, and more preferably in the range of 145 ° to 155 °. In the present embodiment, the angle θ formed by the first plane 151A and the second plane 151B is set to 150 °.

< ordinary charging connector >

The general charging coupler 160A is disposed to protrude from the first plane 151A toward a direction in which the first plane 151A faces. The normal charging coupler 160A is formed in a cylindrical shape with a central axis extending in a protruding direction of the normal charging coupler 160A. The center axis of the normal charging coupler 160A coincides with a first axis L1 extending in a direction in which the normal charging connector 170A is connected with respect to the normal charging coupler 160A. An end 161A, which is a front end in the projecting direction of the normal charging coupler 160A, faces in the first axis L1 direction. That is, the end 161A of the ordinary charging coupler 160A faces rearward and to the left.

< quick charging connector >

The quick charging coupler 160B is provided to protrude from the second plane 151B in a direction in which the second plane 151B faces. The quick-charging coupler 160B is formed in a cylindrical shape with a central axis extending in the protruding direction of the quick-charging coupler 160B. The center axis of the quick charge coupler 160B coincides with a second axis L2 extending in a direction in which the quick charge connector 170B is connected with respect to the quick charge coupler 160B. An end 161B, which is a front end of the quick charging coupler 160B in the protruding direction, faces the second axis L2 direction. That is, the end 161B of the quick charging coupler 160B faces rearward and right.

The normal charging coupler 160A and the quick charging coupler 160B are arranged side by side with each other similarly to the first plane 151A and the second plane 151B. The end in the projecting direction of the normal charging coupler 160A and the end in the projecting direction of the quick charging coupler 160B are opposed to each other in the side-by-side arrangement direction.

Here, "the end of normal charging coupling 160A is opposed to the end of quick charging coupling 160B" also includes a state in which the end of normal charging coupling 160A in the protruding direction and the end of quick charging coupling 160B in the protruding direction are inclined to face each other.

The first axis L1 and the second axis L2 intersect each other at an intersection point P3 on the rear side of the upper rotating body 220. The first axis L1 and the second axis L2 are included on virtual planes orthogonal to both the first plane 151A and the second plane 151B.

The intersection point P1 of the first axis L1 and the first plane 151A and the intersection point P2 of the second axis L2 and the second plane 151B are disposed at the same height position.

The distance D between the intersection point P1 of the first axis L1 and the first plane 151A and the intersection point P2 of the second axis L2 and the second plane 151B (the distance between the intersection points in the parallel arrangement direction) is set, for example, within a range of 120 to 160mm, preferably within a range of 130 to 150mm, and more preferably within a range of 135mm to 145 mm. In the present embodiment, the distance D is set to 137 mm.

The length of the normal charging coupler 160A in the direction of the first axis L1 and the length of the quick charging coupler 160B in the direction of the second axis L2 may be the same as or different from each other.

A normal charging connector 170A connected to the normal charging coupler 160A and a quick charging connector 170B connected to the quick charging coupler 160B are connected to an external power source. The vehicle charging system is configured by the normal charging connector 170A, the quick charging connector 170B, and the electric hydraulic shovel 200.

The ordinary charging connector 170A has an ordinary charging gun 171A. The rear end of the ordinary charging gun 171A is electrically connected to an external power supply via a cable 172A. The normal charging gun 171A can be fitted into the normal charging adapter 160A having a cylindrical front end. In a state where the normal charging gun 171A is fitted to the normal charging coupler 160A, a normal charging terminal (not shown) disposed inside the normal charging coupler 160A of the base 150 is electrically connected to a terminal at the tip end of the normal charging gun 171A. Thus, the electric power from the external power supply is supplied to the normal charging terminal of the charging port 140 via the cable 172A and the normal charging gun 171A. The electric power supplied to the normal charging terminal is supplied to the battery unit 40 via the normal charger and the contactor of the power transmission unit 37.

The quick-charge connector 170B has a quick-charge gun 171B. The rear end of the quick charging gun 171B is electrically connected to an external power source via a cable 172B. The quick charging gun 171B can be fitted into the quick charging coupler 160B having a cylindrical front end. In a state where quick charge gun 171B is inserted into quick charge coupler 160B, a quick charge terminal (not shown) disposed inside quick charge coupler 160B of base 150 is electrically connected to a terminal at the tip of quick charge gun 171B. Thus, electric power from the external power supply is supplied to the quick charging terminal of the charging port 140 via the cable 172B and the quick charging gun 171B. The electric power from the quick-charging connector 170B is supplied to the battery unit 40 via the contactor of the power transmission unit 37.

< action Effect >

When battery unit 40 is charged in electric hydraulic excavator 200, charging port 140 is exposed to the outside of rear cover 110 by opening/closing unit 111 of rear cover 110. In this state, normal charging connector 170A is connected to normal charging coupler 160A of charging port 140, or quick charging connector 170B is connected to quick charging coupler 160B. Here, it is assumed that when the connection of normal charging connector 170A to normal charging coupler 160A and the connection of quick charging connector 170B to quick charging coupler 160B are performed simultaneously, the operator may perform unintended charging. That is, for example, even when the operator desires to connect both charging coupler 160A and quick charging coupler 160B to the respective connectors at the same time as the operator desires to perform charging more quickly, charging is performed with priority to only one of the connectors that is actually connected first. In this case, charging is performed differently from the idea of the operator.

In contrast, in the present embodiment, the connection of normal charging connector 170A to normal charging coupler 160A and the connection of quick charging connector 170B to quick charging coupler 160B cannot be performed simultaneously.

That is, end 161A of normal charging coupler 160A and end 161B of quick charging coupler 160B are opposed to each other in the direction in which they are arranged side by side. Therefore, when an attempt is made to connect the normal charging connector 170A at the normal charging coupler 160A while connecting the quick charging connector 170B at the quick charging coupler 160B, the normal charging gun 171A of the normal charging connector 170A and the quick charging gun 171B of the quick charging connector 170B physically interfere with each other.

That is, normal charging connector 160A and quick charging connector 160B are arranged in such a manner that when the charging connector is connected to one of the connectors, the connection between the charging connector and the other connector is prevented. Therefore, simultaneous connection of the normal charging connector 170A and the quick charging connector 170B can be avoided, and therefore, unintentional charging by an operator can be prevented.

In particular, the normal charging gun 171A is formed in a shape in which the direction of projection of the normal charging coupler 160A, i.e., the direction of the first axis L1, is the longitudinal direction in a state in which it is attached to the normal charging coupler 160A. In addition, the quick charging gun 171B is formed in a shape in which the second axis L2 direction, which is the projecting direction of the quick charging coupler 160B, is the longitudinal direction in a state in which it is attached to the quick charging coupler 160B. Therefore, by intersecting the first axis L1 that coincides with the center axis of the normal charging coupler 160A and the second axis L2 that coincides with the center axis of the quick charging coupler 160B on the outside, the normal charging gun 171A and the quick charging gun 171B can be made to interfere with each other more reliably.

In the present embodiment, the charging connector is not connected to the normal charging coupler 160A and the quick charging coupler 160B at the same time, and therefore, it is not necessary to provide an additional movable portion or the like. Therefore, it is not necessary to consider the wear of the movable portion, and the maintainability can be improved.

Further, the normal charging coupler 160A and the quick charging coupler 160B are oriented by the first plane 151A and the second plane 151B connected to be inclined to each other. Since the first plane 151A and the second plane 151B face the rear side, respectively, the normal charging connector 170A or the quick charging connector 170B can be easily attached to the normal charging connector 160A and the quick charging connector 160B that face the rear side as well. Further, when the normal charging connector 170A or the quick charging connector 170B is attached, since it is not necessary to additionally perform an operation such as moving the movable portion, it is possible to avoid the complication of the work.

< other embodiments >

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can be modified as appropriate within a range not departing from the technical spirit of the present invention.

For example, normal charging coupler 160A and quick charging coupler 160B may be arranged side by side in a direction other than the vehicle width direction, such as the vertical direction or the front-rear direction. Accordingly, the first plane 151A and the second plane 151B may be arranged side by side in other directions.

The normal charging coupler 160A and the quick charging coupler 160B may be configured to approach each other and protrude in the vehicle width direction. In this case, the normal charging coupler 160A and the quick charging coupler 160B are configured to protrude from a pair of surfaces facing each other in the vehicle width direction in a direction in which the surfaces face each other. The distance separating the pair of surfaces is set to be at least longer than the length of the normal charging gun 171A and the quick charging gun 171B in the longitudinal direction. In this case, as in the embodiment, simultaneous connection of the normal charging gun 171A and the quick charging gun 171B can be avoided.

The normal charging coupler 160A and the quick charging coupler 160B are not only used for charging the battery unit 40, but may be a pair of couplers to which connectors of a power supply cable for supplying direct power from an external power supply to the inverter are connected, for example. In this case, it is also possible to avoid simultaneous connection of a plurality of power supply cables to a pair of couplers. Alternatively, a pair of couplers for other applications may be used.

Further, as the first coupling, for example, a charging coupling capable of charging the battery unit 40 by connecting a charging connector as a connector may be provided, and as the second coupling, for example, a power supply connector capable of supplying electric power to the devices in the electric hydraulic excavator 200 by connecting a power supply connector as a connector may be provided. The charging connector and the power supply connector are connected to an external power supply via cables, respectively.

In this case, when the charging connector is connected to the charging coupler, the charging connector prevents the power supply connector from being connected to the power supply coupler. When the power supply connector is connected to the power supply coupler, the power supply connector prevents the charging connector from being connected to the charging coupler.

In the embodiment, the description has been given of the electric excavator 200 as an example of the electric construction work machine, but the invention is not limited thereto. For example, the present invention may be applied to an electric excavator in which the work implement 221 and the like are driven electrically, and an electric hydraulic excavator in which electric power is supplied from the outside via a cable. The present invention may be applied to other electric construction work machines. The present invention can also be applied to an electric forklift and an electric loader.

Industrial applicability

According to the work vehicle and the vehicle charging system of the present invention, the maintenance performance can be improved while avoiding simultaneous connection of an external power supply and a plurality of couplers.

Description of the reference numerals

10 rotating the frame; 11 a base plate; 12 a transverse partition; 13 front longitudinal partitions; 14 a front reinforcing plate; 15 a support; 16 rear longitudinal partitions; a 20-door frame; 21 a pillar portion; 22 a beam section; 36 an inverter; 36a bracket; 37 a power transmission unit; 39 an electric motor; 40 battery cells; 41 a battery box; 42 a battery case; 44a sensor housing; 44a service plug; 51a hydraulic pump; a 52 hydraulic valve; 53 operating a mode switching section; 61a cooling unit; 62 a cooling fan; 63 a heat exchange section; 64 auxiliary equipment batteries; 65 an oil sump; 70a rotary motor; 80 a driving space; 81 floor boards; 84 driver's seat; 90, a top cover; 95 a protection device; 100 an outer cover body; 110 rear cover; 111 an opening and closing part; 120 left cover body; 130 right cover body; 140 a charging port; 150 a base; 151A first plane; 151B second plane; a 160A common charging coupler (first coupler); 160B quick charging coupler (second coupler); end 161A; end portion 161B; 170A general charging connector (connector); 170B quick charging connector (connector); 171A general charging gun; 171B quick charge gun; a 172A cable; a 172B cable; 200 electric hydraulic excavators; 210 a lower traveling body; 211 a crawler track; 212 a squeegee; 215 oscillating ring; 220 an upper rotating body (vehicle body); 221 a working device; 222 a large arm; 223 small arms; 224 a bucket; an O axis of rotation; an L1 first axis; l2 second axis.

Claims

1. A work vehicle characterized by comprising:

a vehicle body;

a charging port externally accessible to the vehicle body;

the charging port has a first coupler and a second coupler, each having an end facing the outside, and each being connectable to a connector connected to an external power supply from the end side, and being arranged adjacent to each other in parallel,

an end portion of the first coupling device and an end portion of the second coupling device are opposed to each other in a direction in which the first coupling device and the second coupling device are arranged side by side.

2. The work vehicle of claim 1,

the charging port further includes a base portion having a first plane and a second plane connected in the parallel arrangement direction so as to be recessed toward an inner side of the vehicle body,

the first coupler is disposed to protrude from the first plane such that a first axis extending in a direction in which the connector is connected to the first coupler is orthogonal to the first plane,

the second coupling is provided so as to protrude from the second plane such that a second axis extending in a direction in which the connector is connected to the second coupling is orthogonal to the second plane.

3. The work vehicle of claim 2,

the first axis intersects the second axis on an outer side of the vehicle body.

4. The work vehicle according to any one of claims 1 to 3,

further has a battery unit provided in the vehicle body,

the first coupler is a general charging coupler capable of general charging of the battery cell by connecting a general charging connector as the connector,

the second coupling is a quick-charge coupling capable of quickly charging the battery cell by connecting a quick-charge connector as the connector.

5. A vehicle charging system, characterized by having:

the work vehicle of claim 4;

the common charging connector and the quick charging connector are connected with the external power supply;

preventing the connection of the quick charging connector to the quick charging coupler by using the normal charging connector when the normal charging coupler is connected to the normal charging coupler,

when the quick charging connector is connected to the quick charging connector, the quick charging connector is used to prevent the quick charging connector from being connected to the ordinary charging connector.

6. The work vehicle according to any one of claims 1 to 3, further comprising:

a battery unit provided in the vehicle body;

a device disposed within the vehicle body;

the first coupler is a charging coupler capable of charging the battery cell by connecting a charging connector as the connector,

the second coupler is a power supply coupler that supplies power to the device by connecting a power supply connector as the connector.

7. A vehicle charging system, characterized by having:

the work vehicle of claim 6;

the charging connector and the power supply connector connected to the external power supply,

preventing the connection of the power supply connector to the power supply connector by the charging connector when the charging connector is connected to the charging connector,

when the power supply connector is connected to the power supply coupler, the charging connector is prevented from being connected to the charging coupler by the power supply connector.