JP5824480B2 - Electric backhoe - Google Patents

Description

  The present invention relates to an arrangement configuration of a battery in an electric backhoe that supplies electric power from a battery to an electric motor and drives a hydraulic pump by the electric motor to enable driving and driving of a work machine.

  Conventionally, in an electric backhoe in which a hydraulic pump is driven by an electric motor, and a traveling device and a work machine are operated by hydraulic oil pumped from the hydraulic pump, a battery for supplying electric power to the electric motor is disposed at the rear of the revolving structure This technique is known (see Patent Document 1). In addition, a configuration in which the battery is disposed on the left and right deck portions is also known (see Patent Document 2).

Japanese Patent Laid-Open No. 9-144062 JP 2001-11889 A

  However, since the conventional electric backhoe is arranged so that there is no extra space on the swivel, there is no space for arranging an additional battery or a spare battery. Therefore, even if it is desired to work longer than the current work time, after a predetermined time has elapsed, the battery must be charged, and the work is interrupted and the work becomes inefficient.

  This invention is made | formed in view of the above situations, and provides the electric backhoe which can add a battery.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

According to claim 1, in a backhoe including a hydraulic pump, an electric motor that drives the hydraulic pump, a battery that supplies electric power to the electric motor, and a driver's seat in a swivel frame, the battery is a secondary battery. consists auxiliary secondary battery cell, to the rear of the rotation table frame, wherein arranged hydraulic pump and the electric motor, on the side of the rotation table frame, the auxiliary secondary batteries are disposed, the main secondary The swivel frame comprising a battery and the auxiliary secondary battery to form one power source, supplying electric power from the power source to the electric motor, and surrounded by an electric motor and an oil tank below the driver's seat and behind The main secondary battery is arranged so as to fill the space from the upper central part to the rear part .

  According to a second aspect of the present invention, the auxiliary secondary battery is configured to be detachable from the swivel frame.

  According to a third aspect of the present invention, a junction box is provided at a lower rear portion of the auxiliary secondary battery, and wirings from the auxiliary secondary battery, the main secondary battery, and the electric motor are connected in the junction box.

  As effects of the present invention, the following effects can be obtained.

It is possible to easily divide the specification with the auxiliary secondary battery into the specification without the auxiliary battery, increase the variation, and expand the selection range.
Moreover, only an auxiliary secondary battery can be removed and charged separately, and a plurality of auxiliary secondary batteries can be used alternately to enable continuous work.

The side view which showed the whole structure of the backhoe which concerns on embodiment of this invention. The side view of a turning body. The front view of a revolving structure. The top view of a turning body. The rear perspective view of a revolving structure. The perspective view which shows arrangement | positioning of a battery.

  First, a schematic configuration of the electric backhoe will be described with reference to FIG. In addition, the arrow A direction in FIG. 1 is demonstrated as the front. In the backhoe (power shovel) 1, a revolving unit 3 is provided on a traveling device 2 so as to be freely rotatable, and a work machine 4 is attached to a front portion of the revolving unit 3.

  The traveling device 2 is supported by a track frame 21 serving as a lower frame, and a driving wheel 22 and a rear driven wheel 23 are disposed on the front side of a support frame portion that is long on the left and right sides of the track frame 21 in the front-rear direction. A crawler belt 24 is wound around the driving wheel 22 and the driven wheel 23. The left and right drive wheels 22 are driven by hydraulic motors (not shown). A swivel frame 31 constituting the swivel body 3 is supported on the center of the track frame 21 through a swivel bearing so as to be swivelable.

  The working machine 4 is mounted on the front portion of the swivel base frame 31. The work machine 4 includes a boom bracket 11, a boom 12, a boom cylinder 13, an arm 14, an arm cylinder 15, a bucket 16, a bucket cylinder 17, and the like. The boom bracket 11 is supported by a projecting portion 31a formed to project forward from the front left and right center of the swivel base frame 31 so as to be rotatable left and right, and can be turned left and right by a swing cylinder 18 (see FIG. 2). ing. The rear lower part of the boom 12 is supported by the upper part of the boom bracket 11 so as to be able to rotate back and forth, and the base part of the boom cylinder 13 is supported by the front part of the boom bracket 11.

  The boom 12 is formed in a “<” shape when viewed from the side, and a rear lower part is supported by the boom bracket 11 so as to be able to turn back and forth, and a tip of a cylinder rod of the boom cylinder 13 is supported by a lower part of the middle part. The boom 12 can be rotated back and forth by extending and contracting. The base of the arm 14 and the tip of the arm cylinder 15 are pivotally supported at the tip of the boom 12, and the base of the arm cylinder 15 is supported at the upper part of the middle part of the boom 12. The arm 14 can be rotated back and forth by extending and contracting the arm cylinder 15. A bucket 16 is supported at the tip of the arm 14, a bucket cylinder 17 is interposed between the bucket 16 and the base side of the arm 14, and the bucket 16 can be extended and retracted by extending and retracting the bucket cylinder 17.

  The swivel body 3 is supported so as to be able to turn on the traveling device 2, and the work implement 4 is mounted on the front portion of the swivel frame 31, and the control unit 30, the battery 50, the hydraulic device, and the hydraulic control unit are mounted on the swivel frame 31. Etc. are arranged.

  As shown in FIGS. 3 and 4, the control unit 30 is provided with a step 32 at a predetermined space from the upper surface of the swivel base frame 31, and a control valve or the like is provided in a space between the swivel base frame 31 and the step 32. A hydraulic control device is arranged. The driver's seat 33 is disposed on the rear portion of step 32, and the operation levers 34 </ b> L and 34 </ b> R of the work machine 4 are disposed on the left and right sides of the driver's seat 33. On the step 32 in front of the driver's seat 33, a travel lever 35, an accelerator pedal, and the like are arranged.

  A canopy frame 36 is erected from the front and rear left and right sides of the driver seat 33, and a canopy roof 37 is provided on the upper portion of the canopy frame 36 to cover the upper side of the driver seat 33. A swivel motor 48 is disposed on the swivel base frame 31 on the lower right side of the driver's seat 33 and can be driven by being supplied with electric power from a battery 50 described later.

  As shown in FIGS. 4 and 5, an electric motor 41, a hydraulic pump 42, a charger 43, an oil tank 44, an oil cooler 45, a water cooler 46, a junction box 47, etc. are disposed on the rear part of the swivel base frame 31. Has been placed. Further, a battery 50 including a main secondary battery 51 and an auxiliary secondary battery 52, which will be described later, is disposed on the turntable frame 31.

  The electric motor 41 is placed on the rear left and right center of the swivel base frame 31. The electric motor 41 is connected to the battery 50 via a drive circuit (inverter) (not shown), and is driven by power supplied from the battery 50.

  The hydraulic pump 42 is disposed on the side (left side) of the electric motor 41 and is connected to and driven by the output shaft of the electric motor 41. When the hydraulic pump 42 is driven, pressure oil is obtained and the control valve is switched, so that the hydraulic oil is pumped to the traveling hydraulic motor or the hydraulic cylinder of the work machine 4 and can be driven.

  The charger 43 is disposed on the lower side (lower right) of the electric motor 41, supplies power from an external power source (commercial power source, engine generator, etc.), transforms it to a predetermined voltage and converts it to direct current, The battery 50 can be charged. Furthermore, the charger 43 includes a protection circuit to prevent overcharging.

  The oil tank 44 stores hydraulic oil and is disposed on the left side of the swivel base frame 31 on the left side of the hydraulic pump 42. The oil cooler 45 cools return oil from a hydraulic actuator such as a hydraulic motor or a hydraulic cylinder and returns it to the oil tank 44, and is disposed on the rear right side of the swivel frame 31. The water cooler 46 cools electric components such as the electric motor 41, the charger 43, and the inverter, and is arranged side by side on the side (front side) of the oil cooler 45. The oil cooler 45 and the water cooler 46 can be cooled by a cooling fan.

  The junction box 47 is a box for storing terminals, wiring, and the like that relay electrical components and the battery 50, and is disposed in front of the oil cooler 45 and the water cooler 46.

  The turning motor 48 drives the turning body 3 to turn left and right with respect to the traveling device 2, and is arranged at the right front portion of the turntable frame 31. The turning motor 48 is constituted by an electric motor, but may be constituted by a hydraulic motor.

  The battery 50 includes a main secondary battery 51 and an auxiliary secondary battery 52, and includes secondary batteries such as a lead storage battery and a lithium ion battery. By supplying electric power from the battery 50, it is possible to operate electric devices such as the electric motor, the control device, and the lamp.

  As shown in FIG. 6, in the main secondary battery 51, a plurality of rectangular parallelepiped battery packs 51 a, 51 a... Are arranged from the central part to the rear part of the swivel frame 31. The main secondary battery 51 is disposed below the driver's seat 33 so as to fill a space surrounded by the step 32, the electric motor 41, the oil tank 44, and the oil cooler 45. Specifically, the main secondary battery 51 has eight battery packs 51a, 51a,... Connected in parallel, the upper and lower two-stage battery packs 51a and 51a at the rear left and right centers, and the upper and lower two-stage batteries in front and right. Two upper and lower battery packs 51a and 51a are arranged in front of the packs 51a and 51a and the left battery pack 51a and 51a, and a turning motor 48 is arranged on the right side of the front battery packs 51a and 51a. In this way, a useless space is not formed, and the center of gravity is lowered by arranging the work machine 4 to be balanced at a low position.

  In the auxiliary secondary battery 52, a plurality of rectangular parallelepiped battery packs 52a, 52a,... Are arranged on the turntable frame 31 on the right side of the control unit 30. The auxiliary secondary battery 52 is arranged with 16 battery packs 52a, 52a,... Arranged in the front-rear direction and stacked in the vertical direction. The battery pack 52a is approximately half the size and half the capacity of the battery pack 51a of the main secondary battery 51. Specifically, the battery pack 52a has four rows in the vertical direction and six rows in the front-rear direction, the rear portion is only the upper row, and a space for arranging the oil cooler 45 and the junction box 47 is formed below the battery pack 52a. .

  The auxiliary secondary battery 52 is configured to be detachable. The auxiliary secondary battery 52 is configured to be detachable as a unit. However, the battery packs 52a, 52a,... May be individually detachable by placing them on a shelf. Further, a rail may be provided so that the auxiliary secondary battery 52 can be easily slid sideways and taken out. The auxiliary secondary battery 52 is covered with a cover, and the side cover 54 is removed or rotated to be opened when the battery is attached or detached.

  When the auxiliary secondary battery 52 is mounted on the swivel base frame 31, the front part of the auxiliary secondary battery 52 is substantially the same position as the front part of the swivel base frame 31, and the rear part is a position above the oil cooler 45. It is arranged until. The upper surface of the auxiliary secondary battery 52 is set to have a height that can secure a side field of view with the same height as the grips of the operation levers 34L and 34R of the control unit 30.

  In this embodiment, the capacities of the main secondary battery 51 and the auxiliary secondary battery 52 are substantially the same, but one can be made larger and the other smaller. The auxiliary secondary battery 52 can be added when necessary. That is, the excavation work by the small backhoe 1 is rarely performed continuously throughout the day, and the excavation work and the laying work, such as the excavation work and the laying work, are performed intermittently or alternately. Often you can finish the day's work. However, grooving and backfilling may be continuously performed, and the capacity of the main secondary battery 51 may be insufficient. In such a case, the auxiliary secondary battery 52 can be optionally attached.

  Further, it is possible to work by mounting an engine generator (not shown) in the space from which the auxiliary secondary battery 52 is removed. The electric output of the engine generator is connected to the inverter and the main secondary battery 51 via the junction box 47. With such a configuration, it is possible to drive the electric motor 41 while generating power, and the surplus power is stored in the main secondary battery 51, so that series hybrid operation can be performed. In this case, switching means for switching between a state of working only with the main secondary battery 51 and a state of working while generating power is provided so that fuel consumption can be reduced. This makes it easy to change the style.

  A junction box 47 is arranged on the side (right side) of the main secondary battery 51 and below the auxiliary secondary battery 52. The junction box 47 is formed in a box shape that opens on the right side, and by opening the side cover 54, the terminals in the junction box 47 and wiring can be attached and detached from the side. A junction box 47 is arranged at a position close to both the main secondary battery 51 and the auxiliary secondary battery 52 to shorten the wiring, and the junction box 47 is connected to the output terminals of the main secondary battery 51 and the auxiliary secondary battery 52. Via, an electric motor 41 and a turning motor 48 are connected via an inverter (not shown). Thus, the wiring can be easily attached and detached during assembly and maintenance.

  As described above, in the backhoe 1 including the hydraulic pump 42, the electric motor 41 that drives the hydraulic pump 42, and the battery 50 that supplies power to the electric motor 41 on the swivel frame 31, the battery 50 includes: It consists of a main secondary battery 51 and an auxiliary secondary battery 52, and a hydraulic pump 42, an electric motor 41, and a main secondary battery 51 are arranged at the rear part on the swivel base frame 31, and an auxiliary is provided on the side part of the swivel base frame 31. Since the secondary battery 52 is disposed, the auxiliary secondary battery 52 can be disposed in an empty space, and the space can be effectively used. Further, the battery capacity can be increased by the auxiliary secondary battery 52, and the working time can be lengthened.

  Since the auxiliary secondary battery 52 is configured to be detachable from the swivel frame 31, the range to be selected according to the user's request can be expanded as a specification with or without the auxiliary secondary battery 52. In addition, only the auxiliary secondary battery 52 can be removed and charged separately, and by providing a plurality of auxiliary secondary batteries 52, continuous operation can be performed by using them alternately. Further, the series hybrid operation can be performed by removing the auxiliary secondary battery 52 and mounting the engine generator. Accordingly, at a site where indoor work and outdoor work are mixed, it is possible to switch between a state where only the main secondary battery 51 is working and a state where the work is performed while generating electricity, as necessary. In this series hybrid operation state, the storage battery capacity can be minimized, so that the cost of the battery 50 can also be reduced. Also, work mainly with the main secondary battery 51. When the capacity of the main secondary battery 51 decreases, the work is performed while charging by switching to the electric power from the engine generator to reduce the fuel consumption. Is also possible.

  A junction box 47 is provided at the lower rear portion of the auxiliary secondary battery 52, and the auxiliary secondary battery 52, the main secondary battery 51, and the wiring from the electric motor 41 are connected in the junction box 47. Easy maintenance and easy maintenance.

DESCRIPTION OF SYMBOLS 1 Backhoe 31 Swivel stand frame 41 Electric motor 42 Hydraulic pump 47 Junction box 48 Turning motor 50 Battery 51 Main secondary battery 52 Auxiliary secondary battery

Claims (3)

In a backhoe including a hydraulic pump, an electric motor that drives the hydraulic pump, a battery that supplies power to the electric motor, and a driver's seat in the swivel frame,
The battery is composed of a main secondary battery and an auxiliary secondary battery,
The hydraulic pump and the electric motor are arranged at the rear of the swivel frame,
On the side of the rotation table frame, the auxiliary secondary batteries are disposed,
The main secondary battery and the auxiliary secondary battery constitute one power source,
Supplying power from the power source to the electric motor;
The main secondary battery is disposed so as to fill a space from the center to the rear of the swivel base frame below the driver's seat and surrounded by an electric motor or oil tank behind the driver's seat. Electric backhoe.   The electric backhoe according to claim 1, wherein the auxiliary secondary battery is configured to be detachable from the swivel frame.   The junction box is provided in the rear lower part of the auxiliary secondary battery, and the wiring from the auxiliary secondary battery, the main secondary battery, and the electric motor is connected in the junction box. Item 3. The electric backhoe according to item 2.

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