JP5781920B2 - Electric work vehicle - Google Patents

Description

  The present invention relates to an electric work vehicle, in particular, electric power from a battery is supplied to an electric motor, a hydraulic pump is driven by the electric motor, and a traveling device and a work machine are driven by hydraulic fluid pumped from the hydraulic pump. The present invention relates to a battery support structure in a backhoe.

  Conventionally, as a drive source for a construction machine such as a backhoe, a hydraulic pump is driven by an electric motor, and hydraulic oil is pumped from the hydraulic pump to a hydraulic motor of a traveling device, a hydraulic cylinder of a work machine, and the like. A technique is known in which a motor is configured to be driven by power supplied from a battery. The battery is arranged at the rear part of the swivel body and also serves as a counterweight (see Patent Document 1 and Patent Document 2).

Japanese Patent Laid-Open No. 9-144062 JP 2008-44408 A

  However, since the conventional battery is fixed on the revolving frame of the revolving structure, vibration during travel and vibration during work are transmitted to the battery as they are. Otherwise, the power supply circuit could break down.

  The present invention has been made in view of the circumstances as described above, and provides an electric work vehicle in which a member for placing and supporting a battery is supported in an anti-vibration manner so that the battery is not damaged or the electric circuit is not easily damaged. .

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

In Claim 1, it arrange | positions so that a turning body can be turned on a traveling apparatus, a working machine is arrange | positioned at the front part of the said turning body, a battery is arrange | positioned at the rear part of the said turning body, and the electric power supply from the said battery is carried out. In the electric work vehicle capable of operating the work implement and the traveling device, a plurality of the batteries are housed in a shelf-like member to form a battery unit, and the battery unit is attached to the revolving body via a vibration isolating member. The battery is placed on the shelf-like member formed on the same circumference with respect to the pivot axis of the swivel body in plan view, and the vibration isolation member is in plan view, It is arrange | positioned at the circumferential direction both sides of the said battery .

According to a second aspect of the present invention, the vibration isolating members are disposed on both upper and lower sides of the battery unit .

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

  According to the first aspect, the battery unit that is accommodated and supported by the battery is supported in an anti-vibration manner integrally with the swivel body, thereby preventing damage to the battery against vibration during traveling and work. In addition, the electrical connection portion can be stably connected, and malfunction or failure of the battery power supply circuit can be prevented.

  According to the second aspect, the vibration isolating structure is simplified because the battery unit is integrally supported by the revolving structure as the battery unit.

The side view which showed the whole structure of the backhoe which concerns on embodiment of this invention. The rear perspective view of a revolving structure. The top view of a turning body. The rear perspective view which shows attachment of a shelf-shaped member. The perspective view which shows attachment of a vibration proof member. The top view which shows arrangement | positioning of the battery of another embodiment.

  First, a schematic configuration of a backhoe as an electric work vehicle will be described with reference to FIG. In addition, the arrow A direction in FIG. 1 is demonstrated as the front. Moreover, in FIG. 2, FIG. 3, the state which removed the rear cover which covers a battery is shown. 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 front driven wheel 23 are disposed on the rear 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, 22 are respectively driven by a hydraulic motor (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 portion of the swivel base frame 31 so as to be able to turn left and right, and can be turned left and right by a swing cylinder (not shown). 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 on 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 machine 4 is mounted on the front part of the swivel base frame 31, and the battery unit 50 is mounted on the rear part of the swivel base frame 31. ), And a control unit 40, a hydraulic device, a hydraulic control unit, and the like are disposed on the center portion of the swivel base frame 31.

  The control unit 40 is provided with a step 32 at a predetermined space from the upper surface of the turntable frame 31. A driver's seat 33 is disposed on the rear part of step 32, operation levers 34L and 34R of work implement 4 are disposed on both the left and right sides of driver's seat 33, and a travel lever 35, an accelerator pedal, and the like are disposed on step 32 in front of driver's seat 33. Has been placed.

  A canopy frame 36 is erected from the rear portion of the driver seat 33, and a canopy 37 is provided on the upper portion of the canopy frame 36 to cover the upper side of the driver seat 33. A hydraulic control device is arranged in a space between the swivel base frame 31 and the step 32, and an electric motor (not shown), a hydraulic pump driven by the electric motor, etc. are arranged on the swivel base frame 31 below the driver seat 33. Yes.

  Next, the mounting configuration of the battery 51, which is the main part of the present invention, will be described in detail with reference to FIGS. The battery 51 is disposed at the rear part of the swing body 3. Specifically, the battery unit 50 is disposed on the rear portion of the swivel base frame 31 behind the driver seat 33. The battery unit 50 is attached to the swivel frame 31 via a vibration isolation member 60 described later. The battery unit 50 includes a battery 51, a shelf-like member 52, a power supply circuit that controls the output voltage and output current of the battery 51, and the like. The battery 51 is a secondary battery such as a lead storage battery or a lithium ion battery. A plurality of batteries 51 are placed and fixed on the shelf-like member 52. By supplying electric power from a plurality of batteries 51, it is possible to operate electric devices such as the electric motor, the control device, and the lamp. The battery 51 of the present embodiment is configured as a rectangular parallelepiped.

  A plurality of batteries 51, 51,... Are arranged along the rear outer shape of the swing body 3. The backhoe 1 is a small rear swivel type, and the swivel body 3 has a rear portion formed in an arc shape in a plan view, and the radius R of the arc is within the lateral outer end of the crawler belt 24 from the swivel axis C at the time of turning, A little larger. Therefore, in a state where the plurality of batteries 51 are placed on the shelf-like member 52, each battery 51 is concentric with the radius R of the outer circle centered on the turning axis C of the turning body 3 in plan view. They are arranged side by side. In other words, the long side of the battery 51 is disposed so as to be parallel to the tangent of a circle having a radius R with the pivot axis C as the center. In other words, the center of gravity of the battery 51 is arranged on a concentric circle with the turning axis C as the center. The plurality of batteries 51 arranged so as to be in contact with the same circumference are arranged at equal intervals and symmetrically arranged. With such an arrangement, the battery 51 can be efficiently arranged along the circumference of the rear portion of the revolving structure 3, and the weight is located on the side opposite to the work machine 4 and farthest from the revolving axis C. The battery 51 which becomes a thing can be arrange | positioned, work stability can be improved as a counterweight, and the front-back weight balance can also be improved.

  In the present embodiment, the plurality of batteries 51, 51... Are arranged in three rows along the upper and lower sides and along the circumference (arc), but the number of rows and the number of rows is not limited. The number is determined by the capacity (capacity), the required voltage, the type of battery, and the like. If the numbers are symmetrical and arranged on the same circumference around the turning axis C, the number of upper stages is small. In addition, it is possible to arrange many lower stages so that the center of gravity is lowered, and it is possible to improve the weight balance. Further, when the backhoe 1 is of a very small turning type, the battery 51 is arranged in an arc within the lateral outer end of the crawler belt 24 from the turning axis C. Further, by configuring the shelf-like member 52 to be attachable to and detachable from the vibration isolating member 60, it is possible to easily change the specification according to the type, size, number, etc. of the battery 51.

  Next, the configuration of the shelf-like member 52 for arranging the battery 51 along the rear arc shape of the revolving structure 3 will be described. As shown in FIG. 4, the shelf-like member 52 includes a shelf plate 53, a shelf column 54, a connecting plate 55, an auxiliary shelf column 56, an outer shelf column 57, an inner shelf column 58, a stop plate 59, and the like. The shelf plate 53 is a plate material on which the battery 51 is placed, has a substantially rectangular shape, and is between the shelf column 54 (auxiliary shelf column 56) and the shelf column 54 (auxiliary shelf column 56) or between the shelf column 54 and the outside. It is installed between the shelf column 57 and the inner shelf column 58 in the horizontal direction. In other words, both sides of the shelf plate 53 are supported by the shelf column 54 and the shelf column 54, or the shelf column 54, the outer shelf column 57 and the inner shelf column 58. The shelf plate 53 is sized to match the size of the bottom surface of the battery 51, and the vertical distance between the shelf plate 53 and the shelf plate 53 is slightly longer than the height of the battery 51 to facilitate storage. A clearance is provided to allow ventilation in the front-rear direction so that cooling can be easily performed.

  On the upper surface of the shelf plate 53, stop plates 59 and 59 are fixed along the side in the longitudinal direction (tangential direction) on the pivot axis side and the outer side, respectively. The outer (rear) stop plate 59 is configured to be detachable. In the present embodiment, the shelf column 54 and the stop plate 59 are fixed from both the left and right sides with bolts or the like. In such a configuration, the rear cover 39 (FIG. 1) of the revolving unit 3 is opened, and the stopper plate 59 is removed, whereby the battery 51 is pulled out backward or inserted from behind to be installed (stored) and fixed. It can be easily replaced and maintained. The stop plate 59 also serves as a reinforcing plate. The uppermost shelf 53 is not fixed with the stop plate 59, the battery 51 is not placed thereon, and increases the strength as a top plate.

  The shelf column 54 is composed of a plate material that is long in the vertical direction, and supports the short side (left and right sides) of the shelf plate 53 at a predetermined height position. In this embodiment, it is fixed by welding. The plate surface of the shelf column 54 is disposed substantially parallel to the radial direction of the turning circle. The outer shelf column 57 and the inner shelf column 58 are arranged on the left and right sides of the shelf-like member 52 and fix the shelf plate 53. In this way, a plurality of shelf boards 53, 53,... Are fixed in the horizontal direction between the left and right shelf columns 54 and the shelf columns 54, thereby forming a set of middle shelf bodies 45M. ing. Further, a plurality of shelf plates 53, 53,... Are fixed in a horizontal direction with a predetermined vertical distance between the shelf column 54 and the left outer shelf column 57 and the inner shelf column 58, and a set of left A shelf 45L is configured. Further, a plurality of shelf plates 53, 53,... Are fixed in a horizontal direction with a predetermined vertical interval between the shelf column 54 and the right outer shelf column 57 and the inner shelf column 58, and a set of right A shelf body 45R is configured.

  The connecting plate 55 and the auxiliary shelf column 56 connect the shelf body 45 and the shelf body 45 (the left shelf body 45L and the middle shelf body 45M, and the middle shelf body 45M and the right shelf body 45R). The connecting plate 55 is fixed between the shelf column 54 and the shelf column 54 as a substantially fan-shaped plate member in plan view. In other words, the shelf plate 53 is fixed in the horizontal direction to the shelf column 54 and the shelf column 54 on the surface (the opposite surface) to which the shelf plate 53 is not fixed. By configuring in this way, when the plurality of shelves 45 and the shelves 45 are connected in the left-right direction by the connecting plate 55, the entire shelf-like member 52 has a substantially fan shape centered on the turning axis C in plan view. I have to. Note that the connecting plate 55 is fixed at the same height as the shelf plate 53 to increase the strength.

  The auxiliary shelf column 56 is formed of a plate material that is long in the vertical direction, and is fixed orthogonally to the connecting plate 55 on the pivot axis C side between the shelf column 54 and the shelf column 54. The side portions of the stop plate 59 on the swivel axis C side are fixed to both sides of the auxiliary shelf column 56 so that the distance between the battery 51 and the battery 51 arranged along the arc is as narrow as possible, and the battery 51 is moved as far back as possible. It can be arranged in. However, the auxiliary shelf column 56 may be omitted and the connecting plate 55 may be used for connection. Thus, the plurality of sets of the shelf bodies 45 (the left shelf body 45L and the middle shelf body 45M, and the middle shelf body 45M and the right shelf body 45R) are arranged along the rear outer shape of the swing body 3. That is, the rear part of the swivel base frame 31 of the revolving body 3 is formed in an arc shape, and the shelf body 45 is arranged in an arc shape by arranging the rear part arc so that the rear part of the shelf body 54 is in contact with the rear arc. The battery 51 is also placed on the shelf-like member 52 in an arc shape. With such a configuration, the battery 51 can be disposed as far back as possible, and the weight can be efficiently distributed to the rear part of the revolving unit 3, thereby serving as a counterweight. Then, by making the circle formed by the arc equal to the width of the crawler belt (traveling device), it becomes difficult to interfere and collide with surrounding obstacles when turning.

  In the shelf-like member 52 of the present embodiment, three sets of shelf bodies (45L, 45M, and 45R) are arranged along the outer peripheral arc of the revolving structure 3; Even if it is a set, four or more sets can be connected and arranged. In the case of two sets, the left shelf body 45L and the right shelf body 45R are connected by the connecting plate 55 and the auxiliary shelf column 56. In the case of three or more sets, a required number of sets of middle shelves 45M are arranged between the left shelves 45L and the right shelves 45R and connected by the connecting plate 55 and the auxiliary shelves 56. That is, the specification can be easily changed by simply increasing the number of sets of the intermediate shelves 45M. Furthermore, in the case of the large-sized revolving structure 3, as shown in FIG. 6, it can also be set as the structure which arrange | positions the battery 51 concentrically inside the battery 51 arrange | positioned along an outer periphery circular arc. However, the shelf-like member 52 is also configured in accordance with the arrangement position of the battery 51. Further, the angle between the left and right sides of the connecting plate 55 is determined in accordance with the radius of curvature of the outer peripheral arc of the revolving structure 3. A power supply circuit for controlling the output voltage, output current and the like of the battery 51 is attached on the uppermost shelf 53 or on the outer surface of the outer shelf column 5 7 and the inner shelf column 58. A battery unit 50 includes a battery 51 placed and stored on the shelf-like member 52 configured as described above and a battery unit 50 attached with a power supply circuit.

  The battery unit 50 (shelf plate member 52) is supported by the revolving structure 3 (the swivel frame 31) via the vibration isolation member 60. As shown in FIGS. 4 and 5, the vibration isolation member 60 includes a mounting plate 61, a vibration isolation rubber 62, and a mounting shaft 63. A mounting shaft 63 is disposed on the shaft center side, a vibration isolating rubber 62 is disposed on the outer peripheral side of the mounting shaft 63, and a mounting plate 61 is disposed on the outer peripheral side of the vibration isolating rubber 62. The anti-vibration rubber 62 is formed in a substantially cylindrical shape and is made of an anti-vibration material such as rubber. The mounting plate 61 has a rhombus shape in plan view, and has a through hole for fitting the vibration isolating rubber 62 in the center. The mounting holes are opened on both sides of the mounting plate 61, and bolts or the like can be inserted to attach to the object on one side. ing. The mounting shaft 63 is a rod-shaped member and has a male screw at one end. The mounting shaft 63 is fixedly provided so as to penetrate the shaft center portion of the vibration-proof rubber 62, and is provided with a male screw at one end projecting. The projecting portion is attached to an object on the other side, and is fastened and fixed with a nut or the like. I am doing so. In the present embodiment, the object on one side becomes the swivel frame 31 of the revolving structure 3 and the mounting plate 61 is fixed, and the object on the other side becomes the shelf plate 53 or the connecting plate 55 of the shelf-like member 52 of the battery unit 50. The attachment shaft 63 is attached.

  The attachment positions of the vibration isolation member 60 are arranged on both sides in the circumferential direction of each battery 51 in plan view. Further, the vibration isolating members 60, 60,... Are arranged on substantially the same circumference around the turning axis C in plan view, and are arranged symmetrically at substantially the same interval. Specifically, the attachment shafts 63 are inserted and fixed in attachment holes provided in the shelf plate 53 and the connection plate 55 on the left and right sides of the lowermost stage. Thus, the battery unit 50 is stably supported.

  Moreover, the upper part of the battery unit 50 is also attached to the support frame 64 via the vibration isolating members 60, 60. In this case, the attachment method of the vibration isolator 60 is an upside down attachment structure. That is, the attachment plate 61 is fixed to the support frame 64, and the attachment shaft 63 is attached to the shelf plate 53 or the connection plate 55 of the shelf-like member 52 of the battery unit 50.

  The support frame 64 is attached to the battery unit 50 via the vibration isolation member 60, and the canopy 37 is attached on the support frame 64. That is, the vibration isolating members 60, 60... Are attached to the uppermost connecting plate 55 and the left and right shelf plates 53, and the support frame 64 is attached to the vibration isolating members 60, 60. It is done. The anti-vibration members 60, 60,... That support the support frame 64 and the anti-vibration members 60, 60,... Attached on the swivel base frame 31 are arranged on the same axis in the vertical direction. They are arranged at the same position in plan view, and the parts are shared to reduce the cost. Further, by fixing the shelf-like member 52 via the vibration isolating member 60 so as to be sandwiched between the support frame 64 and the swivel base frame 31, the vibration isolating effect on the battery 51 is enhanced.

  The support frame 64 is formed in a plate shape in a plan view, and has four protrusions 64a, 64a,... According to the number of the batteries 51 arranged in the horizontal direction, and the tips of the protrusions 64a, 64a,. The mounting holes 64b, 64b,... Are arranged on the same circumference with respect to the pivot axis C. The mounting plate 61 of the vibration isolating member 60 is fixed to the mounting holes 64b, 64b.

  A space is formed between the protruding portion 64 a and the protruding portion 64 a and is positioned above the shelf plate 53. In this way, the electrical components related to the battery 51 can be placed on the uppermost shelf 53 so that the shelf 53 can be used effectively. Further, in the space surrounded by the front side of the shelf-like member 52, the support frame 64, and the swivel base frame 31, a cooling device or the like is accommodated and the space is effectively used.

  As described above, the revolving structure 3 is disposed on the traveling device 2 so as to be revolvable, the work implement 4 is disposed at the front of the revolving structure 3, the battery 51 is disposed at the rear of the revolving structure 3, and the battery 51 In the electric work vehicle in which the work machine 4 and the traveling device 2 can be operated by supplying power from the battery, a plurality of the batteries 51 are housed in a shelf-like member 52 to form a battery unit 50, and the battery unit 50 is a swivel body. 3 is attached via a vibration isolating member 60. With such a configuration, the battery unit 50 that is housed and supported by the battery 51 is integrally supported in a vibration-proof manner with respect to the revolving structure 3, and the battery 51 against vibration during traveling or excavation work. Can be prevented, and the electrical connection portion is also stably connected, so that malfunction or failure can be prevented. In addition, since the anti-vibration support is integrally provided on the revolving unit 3 as the battery unit 50, the anti-vibration structure is simplified.

  Further, the battery 51 is placed on a shelf-like member 52 on the same circumference with respect to the turning axis C of the revolving structure 3 in a plan view, and is vibration-proof on both sides in the circumferential direction of the battery 51 in a plan view. The member 60 is arranged. Accordingly, the load of the battery 51 is supported by the vibration isolating members 60 on both sides, thereby providing stable support.

  Further, since the vibration isolating member 60 is disposed and supported on both upper and lower sides of the battery unit 50, even if another member (canopy 37) is attached above the battery unit 50, the vibration is amplified or different. No sound is generated and vibrational stability can be improved. Moreover, since the battery 51 and the vibration isolating member 60 are configured not to overlap with each other in plan view, the height direction can be kept low, and the battery 51 can be arranged in a compact manner.

C slewing axis 2 traveling device 3 slewing body 4 working machine 50 battery unit 51 battery 52 shelf-like member 60 vibration isolating member

Claims (2)

A revolving structure is disposed on a traveling device so as to be able to revolve, a working machine is disposed at a front portion of the revolving structure, a battery is disposed at a rear portion of the revolving structure, and the working machine and the traveling are supplied by supplying power from the battery. In an electric work vehicle that makes the device operable,
A plurality of the batteries are housed in a shelf-like member to form a battery unit,
The battery unit mounting et been through the vibration isolating member to the pivot member,
The battery is placed on the shelf-like member formed on the same circumference with respect to the turning axis of the turning body in a plan view,
The electric work vehicle , wherein the vibration isolation member is disposed on both sides of the battery in a circumferential direction in a plan view . The electric work vehicle according to claim 1 , wherein the vibration isolation members are arranged on both upper and lower sides of the battery unit .

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