JP5592857B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle including an electric motor that receives power from a battery and a charging connection portion that is connected to an external power supply facility when the battery is charged.

  Conventionally, a lawn mower or the like provided with an electric motor for driving an operation member such as a cutter is known as a working vehicle as described above (see, for example, Patent Document 1). In the work vehicle described in Patent Document 1, the power supply state can be switched between an ON state that enables power supply from the battery to the electric motor and an OFF state that disables power supply from the battery to the electric motor. The switch is provided, and the charging connection portion is disposed at a position spaced apart from the power supply state switching switch. When working on a work vehicle, the power supply state switching switch is switched from the OFF state to the ON state by inserting a key member into the key hole of the power supply state switching switch and turning it. An electric motor is fed from the battery to drive an operation member such as a cutter by the electric motor. When charging the battery, turn off the power supply state switching switch with the key member, and connect the external power supply equipment to the charging connection in a state where power supply from the battery to the electric motor is disabled. And charging the battery.

  Further, in the work vehicle described in Patent Document 1, in order to disable charging of the battery in a state where power can be supplied from the battery to the electric motor, the key member is rotated to switch the power supply state. When the switch is switched to the ON state, a part of the charging connection portion is covered with the key member to prevent the external power supply facility from being connected to the charging connection portion.

Japanese Patent Laid-Open No. 10-191750

  In the work vehicle described in Patent Document 1, when the power supply state switching switch is switched to the ON state, a part of the charging connection portion is covered with the key member, but the power supply state switching Basically, the charging connection portion is exposed to the outside, such as when the switch is switched to the OFF state. Therefore, the charging connection part is exposed to wind and rain, and foreign matter such as dust is likely to enter, and accordingly, the external power supply facility cannot be properly connected to the charging connection part, or the charging connection This causes the problem of causing damage to the parts.

  In addition, in the work vehicle as described above, if the work vehicle is accidentally started with the external power supply facility connected to the charging connection portion, for example, the work may be performed while the external power supply facility is connected to the charge connection portion. The vehicle will be caused to travel, causing problems such as damage to the cord connecting the charging connection portion and the external power supply facility. Therefore, it is also required to prevent the work vehicle from being erroneously started while the external power feeding facility is connected to the charging connection portion.

  The present invention has been made paying attention to such a point, and the object of the present invention is that the external power supply equipment cannot be properly connected to the charging connection section, or the charging connection section is damaged. It is in providing a work vehicle that can prevent the occurrence of the accident and that can be prevented from being erroneously started while the external power feeding facility is connected to the connection portion for charging.

In order to achieve this object, a characteristic configuration of a work vehicle according to the present invention includes an electric motor that receives power from a battery, and a connection portion for charging that is connected to an external power supply facility when charging the battery. In a working vehicle
A power supply state switching switch that can be attached to a covering position that covers the charging connection portion is provided, and the power supply state switching switch is attached to the covering position by operating a key member. It is switchable between an ON state that enables power supply from the battery to the electric motor and an OFF state that disables power supply from the battery to the electric motor, and is configured to be removable from the covering position. There is in point.

According to this feature configuration, the power supply state switching switch can be attached to the covering position covering the charging connection portion. Therefore, the charging connection portion is set by the power supply state switching switch attached to the covering position. It can cover and it can prevent that the connection part for charge is exposed outside. Therefore, it is possible to prevent the charging connection portion from being exposed to wind and rain, and to prevent foreign matters such as dust from entering the charging connection portion. It is possible to prevent the occurrence of the problem that the connection to the battery becomes impossible or the charging connection part is damaged.
And since the switch for power supply state switching can be attached not only to the covering position but also detachable from the covering position, it can be connected from the covering position to connect the external power supply equipment to the charging connection portion. can do. Therefore, the battery can be appropriately charged without the power supply state switching switch getting in the way.

  Moreover, the power supply state switching switch is in the ON state that enables power supply from the battery to the electric motor and the OFF state that disables power supply from the battery to the electric motor with the switch being mounted at the covering position. The switch is switchable. Thus, the power supply state switching switch cannot be switched to the ON state that enables power supply from the battery to the electric motor unless the power supply state switching switch is mounted at the covering position. Therefore, with the external power supply equipment connected to the charging connection portion, the power supply state switching switch is removed from the covering position, and the power supply state switching switch cannot be switched to the ON state. It cannot be driven. As a result, it is possible to prevent the work vehicle from being erroneously started while the external power feeding facility is connected to the charging connection portion.

  According to a further characteristic configuration of the work vehicle according to the present invention, the power supply state switching switch is configured to be switchable to a charging state in which the battery is charged by operation of the key member. When the power switch is switched to a state other than the charging state, the power supply state switching switch is locked to the state where the switch is mounted at the covering position, and the power supply state switching switch is switched to the charging state. In this case, a lock means for releasing the lock in a state where the power supply state switching switch is mounted at the covering position is provided.

  According to this characteristic configuration, the locking means locks the power supply state switching switch mounted in the covering position when the power supply state switching switch is switched to an OFF state or an ON state other than the charging state. Therefore, when the power supply state switch is switched between the ON state and the OFF state, the power supply state switch is not accidentally removed from the covering position, and the power supply state switch is turned on. Switching between the state and the OFF state can be performed appropriately. When the power supply state switching switch is switched to the charged state, the lock means releases the lock in the state where the power supply state switching switch is mounted at the covering position. By switching the state switching switch to the charging state, the power supply state switching switch can be appropriately removed from the covering position. In addition, when charging the battery, the power supply state switching switch cannot be removed from the covering position unless the power supply state switching switch is switched to the charged state by operating the key member by the operator. The battery can be charged by performing an appropriate operation without accidentally removing the power supply state switching switch from the covering position.

  According to a further characteristic configuration of the work vehicle according to the present invention, the charging connection portion includes an inner position where the charging connection portion is retracted toward the inner side of the work vehicle main body, and an outer position positioned on the outer side than the inner position. The power supply state changeover switch is configured to restrict the movement of the charging connection portion from the inner position to the outer position in a state where the switch is mounted at the covering position, and the covering position. The charging connection portion is provided so as to allow movement from the inner position to the outer position in a state where the charging connection section is detached from the charging position.

  According to this feature configuration, by attaching the power supply state switching switch to the covering position, the power supply state switching switch regulates the movement of the charging connection portion from the inner position to the outer position. By attaching the switch for switching the power supply state to the covering position, the charging connection part is properly positioned at the inner position on the inner side of the work vehicle main body, and the exposure of the charging connection part to the outside is ensured. Can be prevented. In addition, by removing the switch for switching the power supply state from the covering position, it is possible to move the charging connection portion from the inner position to the outer position. There is no need to work such as extending the connection cord of the power supply facility to the inside of the work vehicle main body, and the external power supply facility can be easily connected to the connection portion for charging.

  A further characteristic configuration of the work vehicle according to the present invention is that urging means for urging the charging connection portion toward the outward position is provided.

  As described above, when the charging connection portion is movably provided between the inner position and the outer position, the hand is inserted into the inner side of the work vehicle body, and the charging is performed from the inner position to the outer position. Since the connecting portion must be pulled out, it is more burdensome for the operator to move the charging connecting portion from the inner position to the outer position. Therefore, according to the present characteristic configuration, the biasing means for biasing the charging connection portion toward the outer position side is provided, so that the biasing force of the biasing means is used to shift the inner position from the inner position to the outer position. The connecting portion for charging can be moved, and the burden on the operator can be reduced.

  A further characteristic configuration of the work vehicle according to the present invention is that a position holding means for holding the charging connection portion when the charging connection portion is located at an outward position is provided.

  As described above, when the charging connection portion is movably provided in the inward position and the outward position, when charging the battery, the charging connection portion is positioned in the outer position and the charging is performed. An external power supply facility will be connected to the connecting part. At this time, if the connecting portion for charging moves to the inner position side or the like, it becomes difficult to connect the external power feeding equipment to the connecting portion for charging. Therefore, according to the present characteristic configuration, when the charging connection portion is located at the outward position, the position holding means for holding the charging connection portion includes the charging connection portion held at the outer position. What is necessary is just to connect an external power supply equipment, and it becomes easy to perform the connection work of the external power supply equipment to the connection part for charge.

Side view showing the outline of an agricultural tractor Block diagram in the plane showing the outline of the agricultural tractor The perspective view in the state which removed the switch for electric power supply state change from the covering position in the control part of an agricultural tractor Sectional view of the control unit and front view of the control unit with the power supply state switching switch switched to the OFF state and the power supply state switching switch installed in the covering position Sectional view of the control unit and front view of the control unit with the power supply state switching switch switched to the ON state and the power supply state switching switch installed in the covering position Sectional view of the control unit and front view of the control unit with the power supply state switching switch switched to the charged state and the power supply state switching switch removed from the covering position The figure which shows the locking means in another embodiment

An embodiment of a work vehicle according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the work vehicle according to the present invention is applied to an electric agricultural tractor 1, and the agricultural tractor 1 is an electric motor 2 (a driving part for driving the agricultural tractor 1). For example, an AC motor) and a battery 3 that can feed power to the electric motor 2 are provided.

  The agricultural tractor 1 has a structure in which an electric motor 2 and a transmission case 4 are connected via a sheet metal housing frame 5, and is steered to a front frame 6 extending forward from a lower portion of the electric motor 2. A front wheel 7 is supported. The rotational force extracted from the electric motor 2 is transmitted from the gear case 8 serving also as a speed reducer to the transmission case 4 via the drive shaft 10 disposed below the seat 9. Rear wheels 12 for traveling are mounted on the left and right sides of the differential case 11 disposed at the rear portion of the transmission case 4, and a PTO output shaft 13 projects rearward from the rear surface of the differential case 11. A lift arm 15 that is hydraulically driven by a cylinder case 14 connected to the upper portion of the differential case 11 performs an elevating operation of the three-point link mechanism 16 for connecting the work device.

  In the mission case 4, the rotational power of the electric motor 2 is divided into a travel output shaft (not shown) for driving the rear wheel 12 and a PTO output shaft 13 for driving a working device such as a tillage device. Power split means (not shown) is provided. The power split means can be constituted by, for example, a sun gear connected to the rotating shaft of the electric motor 2 and two planetary gears meshing simultaneously with the inner teeth of the sun gear. The rotational force extracted by the first planetary gear is a forward / reverse switching gear train (not shown) and a differential case 11 that are operated via a speed change lever 17 provided on the side portion of the seat 9. And are transmitted to only the rear wheel 12 or both the front wheel 7 and the rear wheel 12. The rotational force extracted by the second planetary gear is applied to the PTO output shaft 13 via a PTO clutch (not shown) operated via a PTO operation lever 18 provided on the lateral side portion of the seat 9 or the like. Has been communicated.

  A steering unit 20 including a steering 19 and various display units is disposed behind the electric motor 2, a driving seat 9 is disposed behind the steering unit 20, and the electric motor 2 is disposed in front of the electric motor 2. A battery 3 for supplying power to the electric motor 2 is disposed. The electric power of the battery 3 is configured to be supplied to the electric motor 2 through a power supply circuit 21 with an inverter disposed adjacent to the electric motor 2. And in order to charge the battery 3, the connection part 24 (for example, charging plug) connected to the external side connection part 23 of the external power supply equipment 22 is provided, and the external side connection part 23 of the external power supply equipment 22 is provided. The power supplied to the connected charging connection unit 24 is configured to be charged to the battery 3 through the charging circuit 25.

  In the present embodiment, as shown in FIGS. 1 and 2, the charging connection portion 24 is disposed so as to be covered with a power supply state switching switch 26 disposed on the right side portion of the steering 19 of the steering portion 20. ing. The power supply state switching switch 26 is in an ON state in which power can be supplied from the battery 3 to the electric motor 2 by an operation of the key member 29 and in an OFF state in which power supply from the battery 3 to the electric motor 2 is disabled. And a start switch for driving the agricultural tractor 1.

Hereinafter, the charging connection portion 24 and the power supply state switching switch 26 will be described.
As shown in FIG. 3 to FIG. 6, the charging connection portion 24 is provided on the inner side of the control portion 20 (corresponding to the inner side of the work vehicle main body), and the power supply state switching switch 26 is It can be attached to a covering position that covers the charging connection portion 24 and can be detached from the covering position. FIG. 3 is a perspective view of the power supply state switching switch 26 with the switch 26 removed from the covering position. FIG. 4 shows a state in which the power supply state switching switch 26 is turned off and the power supply state switching switch 26 is attached to the covering position. FIG. 5 shows a state in which the power supply state switching switch 26 is turned on and the power supply state switching switch 26 is attached to the covering position. FIG. 6 shows a state where the power supply state switching switch 26 is removed from the covering position. 4 to 6, (a) is a cross-sectional view of the control unit 20, and (b) is a front view of the control unit 20.

  As shown in FIG. 3, a mounting recess 27 that is recessed inward of the control unit 20 is formed at the covering position of the control unit 20, and is shown in FIGS. 4 (a) and 5 (a). Thus, the mounting recess 27 has a depth side in the depth direction of the mounting recess 27 (corresponding to the X1 direction side in FIGS. 4A and 5A and the inner side of the work vehicle body). The charging connection portion 24 is inserted and attached, and the power supply state switching switch is disposed on the front side in the depth direction from the charging connection portion 24 (X2 direction side in FIGS. 4A and 5A). 26 is inserted and configured to be freely mounted. As shown in FIGS. 3 and 6A, the power supply state switching switch 26 is removed from the mounting recess 27 so that the power supply state switching switch 26 can be removed from the covering position. Yes. The power supply state switching switch 26 is connected to the control unit 20 by a connecting body 44 such as a string-like body, and prevents the power supply state switching switch 26 from being lost even when it is removed from the covering position.

  The covering position is the direction from the near side in the depth direction of the mounting concave portion 27 to the far side (the X1 direction in FIGS. 4A and 5A, the direction of the middle page in FIGS. 4B and 5B). In the direction from the front side to the back side, the power supply state switching switch 26 mounted at the covering position and the charging connection portion 24 (see the dotted lines in FIGS. 4B and 5B) overlap. In addition, the charging connection portion 24 is entirely covered with the power supply state switching switch 26 when viewed from the front side in the depth direction of the mounting recess 27 toward the back side. As a result, when the power supply state switching switch 26 is mounted in the covering position, the entire outer side of the charging connection portion 24 is covered with the power supply state switching switch 26, and charging is performed. The connection part 24 for charging is not exposed to the outside of the vehicle, and the connection part 24 for charging is not exposed to wind and rain, thereby preventing foreign matters such as dust from entering the connection part 24 for charging.

  As shown in FIG. 3 and FIG. 4A, the power supply state switching switch 26 has an insertion / removal portion 26a that is formed in a columnar shape and can be inserted into and removed from the mounting recess 27, and an opening of the mounting recess 27. And an occlusion site 26b to be occluded. The obstruction | occlusion site | part 26b is a cross-sectional shape provided with the disk-shaped site | part larger diameter than the insertion / extraction site | part 26a, and the bending site | part which bent the radial direction outer end site | part to the insertion / extraction site | part 26a side (FIG. (See (a)).

The mounting recess 27 is in order from the near side in the depth direction (direction X1 in FIGS. 4A and 5A), the first part 27a, the second part 27b, the third part 27c, and the fourth part 27d. It has a plurality of parts. The first part 27a is formed in a circular shape having the same diameter as the insertion / removal part 26a of the power supply state changeover switch 26, and the second part 27b is a lower part in the circumferential direction than the first part 27a. It is formed in a shape that widens to the side. The 4th site | part 27d is formed in the rectangular shape which has the same width as the connection part 24 for charging formed in the rectangular shape, and the 3rd site | part 27c is a lower side of the circumferential direction rather than the 4th site | part 27d in the 3rd site | part 27c. It is formed in a widened shape.
Here, the shape of the charging connection portion 24 is not limited to a rectangular shape, and may be formed in, for example, a cylindrical shape. In this case, the fourth portion 27d of the mounting recess 27 is also formed in a circular shape. be able to.

  An insertion / removal part 26a of the power supply state changeover switch 26 is slidably provided over the first part 27a and the second part 27b. Thus, the insertion position 26a is inserted into the mounting recess 27, so that the insertion / removal part 26a is slid over the first part 27a and the second part 27b to cover the charging connection part 24. A power supply state changeover switch 26 is mounted on. A projecting portion 28 that projects outward from the vehicle body is provided on the periphery of the mounting recess 27 in the control unit 20. When the power supply state switching switch 26 is attached to the covering position, the protrusion 28 is sandwiched between the insertion / removal part 26a and the blocking part 26b, and the tip of the protrusion 28 is brought into contact with the blocking part 26b. Yes. Further, the insertion / removal part 26a is slid over the first part 27a and the second part 27b, and the insertion / removal part 26a is removed from the mounting recess 27, whereby the power supply state switching switch 26 is removed from the covering position. ing.

  The power supply state switching switch 26 is in an ON state in which power can be supplied from the battery 3 to the electric motor 2 by operation of the key member 29 in a state where the switch 26 is mounted at the covering position, and from the battery 3 to the electric motor 2. It is configured to be switchable to an OFF state that disables power supply. As shown in FIGS. 3 to 5, the power supply state switching switch 26 is formed with a key hole 30 into which the key member 29 can be inserted and removed, and the key member 29 is inserted into the key hole 30. By turning the key member 29, the power supply state switching switch 26 itself is rotated in the mounting recess 27 so as to be switched between an ON state and an OFF state. That is, the insertion / removal portion 26 a of the power supply state switching switch 26 is provided with the switch-side contact 31 at a predetermined position in the circumferential direction (for example, a position corresponding to the key hole 30), and the inner wall portion of the mounting recess 27. Has a vehicle body side contact 32 at a predetermined position in the circumferential direction (for example, a position corresponding to “ON”), and can be switched between an ON state and an OFF state depending on whether or not these contacts are in contact with each other. It has become. As shown in FIG. 4, when the key hole 30 exists at a position corresponding to “OFF”, the switch-side contact 31 and the vehicle-body-side contact 32 are separated, and the power supply state switching switch 26 is in the OFF state. It has been switched to. Further, as shown in FIG. 5, when the key hole 30 and the key member 29 are present at the position corresponding to “ON”, the switch side contact 31 and the vehicle body side contact 32 are brought into contact with each other to switch the power supply state. Switch 26 is switched to the ON state. The key member 29 can be inserted into and removed from the key hole 30 when the key hole 30 exists at a position corresponding to “cut”.

  Here, although not shown in the figure, a blocking means for blocking the rotation of the power supply state switching switch 26 in a state where the key member 29 is not inserted into the key hole 30 is provided. For example, when the key member 29 is not inserted into the key hole 30, the blocking means engages with the power supply state switching switch 26 to prevent the power supply state switching switch 26 from rotating. The key member 29 is inserted into the key hole 30 and can be configured to include a locking pin or the like that can be released from the power supply state switching switch 26 by being pressed by the key member 29 or the like.

  Thus, when the agricultural tractor 1 is driven, the key member 29 is inserted into the key hole 30 and rotated to rotate the key hole 30 and the key member 29 to a position corresponding to “ON”. Then, the power supply state switching switch 26 is switched to the ON state, power supply from the battery 3 to the electric motor 2 is started, the electric motor 2 is driven, and the agricultural tractor 1 is driven.

  The power supply state changeover switch 26 is rotated to a position corresponding to “charging” in addition to a position corresponding to “on” and “off” by rotating the key member 29 inserted into the key hole 30. It is configured to move freely. The power supply state switching switch 26 is arranged in the order of “charging”, “off”, and “on” in the clockwise direction in the rotation direction. Then, when the key member 29 and the key hole 30 are present at a position corresponding to “charging” by the turning operation of the key member 29, the power supply state switching switch 26 enters a charging state in which the battery 3 is charged. Can be switched. Here, regarding the rotation operation from the position corresponding to “OFF” to the position corresponding to “CHARGE”, even if the key member 29 is rotated as it is, for example, by restricting the rotation of the key hole 30, The position corresponding to “cut” cannot be rotated from the position corresponding to “charge”, and the key member 29 and the key hole 30 are pushed into the depth side of the mounting recess 27 to correspond to “cut”. The position can be turned to a position corresponding to “charging”. This prevents the key member 29 and the key hole 30 from being erroneously rotated to a position corresponding to “charging”.

  As described above, the power supply state switching switch 26 can be mounted at the covering position and can be removed from the covering position. Therefore, as shown in FIG. 6A, the battery 3 is charged. In other words, the external connection part 23 of the external power supply equipment 22 can be connected to the charging connection part 24 by removing the power supply state switching switch 26 from the covering position. When the battery 3 is not charged, a lock means 33 is provided as shown in FIGS. 3 to 5 in order to hold the power supply state switching switch 26 with respect to the covering position. Yes.

  The lock means 33 is provided on the protrusion 34 provided at a predetermined position in the circumferential direction in the insertion / removal portion 26a of the power supply state switching switch 26 and on the inner periphery of the mounting recess 27 of the control unit 20 on the vehicle body side. And a concave locking groove 35 formed therein. The locking groove 35 is formed along the circumferential direction of the inner wall portion of the mounting recess 27. By engaging the projection 34 in the locking groove 35, the movement of the mounting recess 27 of the power supply state switching switch 26 in the depth direction is restricted, and the power supply state switching switch 26 is moved to the covering position. It is locked in the state of being attached to. A recess-like protrusion insertion / removal groove extending in the depth direction in a state of being connected to the locking groove 35 at a desired position in the circumferential direction (for example, a position corresponding to “charging”) is provided on the inner wall of the mounting recess 27. 36 is formed. By engaging the protrusion 34 in the protrusion insertion / removal groove 36, the power supply state switching switch 26 is allowed to move in the depth direction of the mounting recess 27 of the power supply state switching switch 26. The lock is released when the cover is attached to the covering position. In this way, when the power supply state switching switch 26 is switched to a state other than the charged state, the locking means 33 engages the protrusion 34 in the locking groove 35 to switch the power supply state. When the switch 26 is locked in the state where it is attached to the covering position and the power supply state switching switch 26 is switched to the charged state, the protrusion 34 is engaged in the protrusion insertion / removal groove 36. The power supply state switching switch 26 is configured to release the lock in the state where the switch 26 is mounted at the covering position.

  The charging connection portion 24 is not fixed in the mounting recess 27, but as shown in FIGS. 4 (a) and 5 (a), an inward position where the charging connection portion 24 is retracted toward the inward side of the vehicle body, As shown in FIG. 6 (a), it is slidably provided at an outer position located on the outer side than the inner position. The charging connection portion 24 is provided so as to slide between the inner position and the outer position by sliding in the mounting recess 27, and between the inner position and the outer position. The movement of the charging connection portion 24 is regulated by the power supply state switching switch 26. That is, as shown in FIGS. 4A and 5A, the power supply state switching switch 26 is in contact with the charging connection portion 24 so that the charging connection portion is mounted in the covering position. The movement from the inner position of 24 to the outer position is restricted. At this time, the terminals 24a and the like of the charging connection portion 24 are configured so as to be freely housed in a concave storage portion 39 formed at the back end of the power supply state switching switch 26 in the depth direction of the mounting recess 27. Yes. Then, as shown in FIG. 6A, the power supply state switching switch 26 permits the movement of the charging connection portion 24 from the inner position to the outer position in a state where it is removed from the covering position. It is configured.

  A charging cord 37 is connected to the charging connection portion 24 at the inner side end of the vehicle body (work vehicle main body). A biasing means 38 (for example, a biasing spring or the like) that biases the charging connection portion 24 toward the outer side of the vehicle body between the rear end portion in the depth direction of the mounting concave portion 27 and the charging connection portion 24. Elastic member), and the charging connection portion 24 is urged toward the outward position by the urging force of the urging means 38. As a result, as shown in FIG. 6A, when the power supply state switching switch 26 is removed from the covering position, the charging connecting portion 24 is removed from the inward position by the urging force of the urging means 38. Move to the position.

  Further, when the charging connection portion 24 is located at the outer position, position holding means 40 is provided for holding the charging connection portion 24 at the outer position. The position holding means 40 is supported by the inner wall portion of the first portion 27a of the mounting recess 27 and the elastically deformable extension extending from the near side in the depth direction to the back side of the mounting recess 27. The body 41 is configured. An inclined portion 42 and an engaging portion 43 are provided at the distal end portion of the extended body 41. In order to shift from the state shown in FIG. 4A to the state shown in FIG. 6A, the charging connection portion 24 slides on the inclined portion 42 when the charging connection portion 24 moves from the inner position to the outer position. Thus, the extension body 41 does not hinder the movement of the charging connection portion 24 from the inner position to the outer position. Then, as shown in FIG. 6A, when the charging connection portion 24 moves to the outward position, the engagement portion 43 engages with the back end of the charging connection portion 24, so that the mounting is performed. The movement of the charging connection portion 24 to the back side in the depth direction of the concave portion 27 is restricted, and the charging connection portion 24 is held at the outer position. Thereby, when connecting the external side connection part 23 of the external power supply equipment 22 to the connection part 24 for charging, the movement of the connection part 24 for charging can be regulated, and the external side connection part to the connection part 24 for charging. 23 connections can be made easily and appropriately. The extending body 41 is configured to be elastically deformable. 4A and FIG. 5A, when the power supply state switching switch 26 is inserted into the mounting recess 27 when the power supply state switching switch 26 is mounted at the covering position. The extension body 41 is pressed downward by the power supply state switching switch 26 to be elastically denatured, and is housed in a hollow portion that is expanded downward in the second portion 27b and the third portion 27c of the mounting recess 27. It is configured to be elastically deformable to the posture. Therefore, when the power supply state switching switch 26 is mounted at the covering position, the insertion of the power supply state switching switch 26 into the mounting recess 27 is not hindered by the extension body 41, and the power supply state switching is performed. The switch 26 can be appropriately mounted at the covering position.

Hereinafter, a procedure for charging the battery 3 will be described.
For example, when charging the battery 3 from the state where the agricultural tractor 1 is driven, first, the key member 29 is moved from the position corresponding to “ON” in order to shift from the state shown in FIG. 5 to the state shown in FIG. The power supply state switching switch 26 is switched from the ON state to the OFF state by turning to the position corresponding to “OFF”, the power supply from the battery 3 to the electric motor 2 is disabled, and the electric motor 2 is driven. Stop. Thereby, the battery 3 can be charged in a state where the power supply from the battery 3 to the electric motor 2 is disabled. Next, the key member 29 is pushed into the depth side of the mounting recess 27 to shift from the position corresponding to “OFF” to the position corresponding to “CHARGE” in order to shift to the state shown in FIGS. The key member 29 is rotated. Along with this, the projection 34 is engaged in the projection insertion / removal groove 36, and the lock to the state where the power supply state switching switch 26 is attached to the covering position by the lock means 33 is released, and the power supply The state changeover switch 26 can be removed from the covering position. Then, by removing the power supply state switching switch 26 from the mounting recess 27, the charging connection portion 24 is moved from the inward position to the outward position by the urging force of the urging means 38, and the position holding means 40 The charging connection portion 24 is held in the outward position. In this way, the battery 3 is charged by connecting the external connection portion 23 of the external power supply equipment 22 to the charging connection portion 24 held at the outer position by the position holding means 40. Can do. When the external power supply facility 22 is connected to the charging connection portion 24, since the power supply state switching switch 26 is removed, the power supply state switching switch 26 can be switched to the ON state. It is not possible to start the agricultural tractor 1 by mistake.

Next, a procedure for driving the agricultural tractor 1 from a state where the charging of the battery 3 is completed will be described.
First, the removed power supply state switching switch 26 is inserted into the mounting recess 27, and the charging connection portion 24 is pushed into the depth direction of the mounting recess 27 by the power supply state switching switch 26 to be removed. The power supply state switching switch 26 is attached to the covering position while being moved from the first position to the inner position. Then, in order to shift from the state shown in FIG. 6 to the state shown in FIG. 4, the key member 29 is rotated from the position corresponding to “Charge” to the position corresponding to “Off”. By this turning operation, the projection 34 is engaged in the locking groove 35, and the lock means 33 locks the power supply state switching switch 26 in a state where it is mounted at the covering position. The key member 29 is rotated from the position corresponding to “OFF” to the position corresponding to “ON”, and the power supply state switching switch 26 is switched from the OFF state to the ON state. The electric tractor 1 is driven by driving the electric motor 2.

[Another embodiment]
(1) In the above embodiment, the locking means 33 includes the protrusion 34 and the locking groove 35. Instead of this, for example, as shown in FIG. 7, the lock means 33 may be configured to include a lock pin 45 and a concave engagement portion 46 into which the lock pin 45 can be engaged.

  In this case, for example, at a predetermined position in the circumferential direction of the mounting recess 27 (for example, a position corresponding to “charging”), a lock pin 45 is provided on the inner side in the radial direction so as to be freely retractable, and a coil spring or the like. The lock pin 45 is urged to the protruding side by the elastic body 47. The engaging portion 46 is formed to extend along the circumferential direction at a predetermined position (for example, a position other than the position corresponding to “charging”) of the peripheral portion of the insertion / removal portion 26 a of the power supply state switching switch 26. . When the key member 29 and the key hole 30 exist at positions other than the position corresponding to “charging”, the lock pin 45 engages with the engaging portion 46 and the mounting recess 27 of the power supply state switching switch 26 is engaged. The movement in the depth direction is restricted, and the power supply state switching switch 26 is locked in the state where it is mounted at the covering position. Further, when the key member 29 and the key hole 30 are present at a position corresponding to “charging”, the lock pin 45 is pressed toward the retraction side by the peripheral portion of the insertion / removal portion 26 a of the power supply state switching switch 26. The lock pin 45 is disengaged from the engaging portion 46, and the power supply state changeover switch 26 is allowed to move in the depth direction of the attachment recess 27, and the power supply state changeover switch 26 is attached to the covering position. The lock at is released.

(2) In the above embodiment, the power supply state switching switch 26 itself is configured to be rotatable in the mounting recess 27. Instead of this, for example, the power supply state switching switch 26 may be configured to include a cylindrical body and a rotating body that is rotatable within the cylindrical body. In this case, the cylindrical body is inserted into the mounting recess 27 and fixed, and the rotary member is rotated with respect to the cylindrical body by inserting the key member 29 into the key hole 30 formed in the rotary body. The key hole 30 and the key member 29 can be rotated to a predetermined position such as a position corresponding to “ON”. Then, a through groove is formed in the peripheral wall portion of the cylindrical body, and the switch side contact 31 and the protruding portion 34 are provided on the outer peripheral portion of the rotating body in a state of penetrating the cylindrical body through the through groove. Similarly, the power supply state switching switch 26 can be configured to be switchable between an OFF state, an ON state, and a charged state, and can be provided with a lock means 33.

(3) In the above embodiment, the electric motor 2 is provided as a driving part of the agricultural tractor 1, and the agricultural tractor 1 is allowed to travel and the PTO output shaft 13 is rotatable by the rotational power of the electric motor 2 without an engine. It is configured. Instead of this, for example, an engine may be provided as a driving part for running the agricultural tractor 1, and an electric motor may be provided as a driving part for rotating the PTO output shaft 13. Further, instead of including one electric motor, two electric motors are provided, that is, an electric motor as a driving part for running the agricultural tractor 1 and an electric motor as a driving part for rotating the PTO output shaft 13. You can also.

(4) In the above embodiment, the agricultural tractor 1 is exemplified as the work vehicle according to the present invention. However, the present invention is not limited to this agricultural tractor. For example, an agricultural work vehicle such as a combine, a civil engineering work vehicle, and a construction work vehicle. It can be applied to various work vehicles such as.

  The present invention includes an electric motor that receives power from a battery, and a connection portion for charging that is connected to an external power supply facility when charging the battery, and appropriately connects the external power supply facility to the connection portion for charging. It is possible to prevent the occurrence of the problem that it becomes impossible or causes damage to the charging connection part, and it is possible to prevent accidental starting with the external power supply equipment connected to the charging connection part. It can be applied to various work vehicles that can be used.

2 Electric motor 3 Battery 22 External power supply facility 24 Charging connection portion 26 Power supply state switching switch 29 Key member 33 Locking means 38 Energizing means 40 Position holding means

Claims (5)

A work vehicle including an electric motor that receives power from a battery, and a charging connection that is connected to an external power supply facility when charging the battery,
A power supply state switching switch that can be attached to a covering position that covers the charging connection portion is provided, and the power supply state switching switch is attached to the covering position by operating a key member. It is switchable between an ON state that enables power supply from the battery to the electric motor and an OFF state that disables power supply from the battery to the electric motor, and is configured to be removable from the covering position. Working vehicle.   The power supply state switching switch is configured to be switchable to a charging state for charging the battery by operating the key member, and the power supply state switching switch is switched to a state other than the charging state. The power supply state switching switch is locked to the state where the power supply state switching switch is mounted in the covering position and the power supply state switching switch is switched to the charging state. The work vehicle according to claim 1, further comprising: a lock unit that releases a lock when the cover is attached to the covering position.   The charging connection portion is provided movably at an inward position where the work vehicle main body is retracted to an inward side and an outward position located on the outer side of the inward position, and for switching the power supply state The switch regulates the movement of the charging connection portion from the inner position to the outer position in the state where the switch is attached to the covering position, and the inner portion of the charging connection portion is removed from the covering position. The work vehicle according to claim 1, wherein the work vehicle is provided so as to allow movement from one direction to an outer position.   The work vehicle according to claim 3, further comprising an urging unit that urges the charging connection portion toward an outward position.   5. The work vehicle according to claim 3, further comprising a position holding unit configured to hold the charge connection portion when the charge connection portion is located at an outward position.

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