JP2018133968A - Work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work vehicle that can effectively suppress work equipment from being started by wrong operation.SOLUTION: A refuse collecting vehicle 1 comprises: a battery 4; an input end 51p to which electric power is inputted from the battery 4; a branch circuit 50 that has a first output end 52p and a second output end 53p which branch and output the inputted electric power; a driving part D1 for travelling the vehicle that is connected to the first output end 52p and is supplied with electric power from the battery 4 to be driven; a relay circuit 60 for travelling the vehicle, arranged at a midway of a cable run through which the battery 4 is connected to the input end 51p, which can open and close the cable run; a driving part D2 for working that is connected to the second output end 53p and is supplied with electric power from the battery 4 to drive refuse collecting equipment hung across a vehicle body 10; and a relay circuit 70 for working, arranged at a midway of a cable run through which the second output end 53p is connected to the driving part D2 for working, which can open and close the cable run.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a work vehicle.

  2. Description of the Related Art Conventionally, for example, in a work vehicle such as a garbage collection vehicle, an electric motor that drives a work device mounted on a vehicle body is connected to a traveling battery, and the work device is driven using the power of the battery. Yes (see, for example, Patent Document 1).

JP 2004-189409 A

  In conventional work vehicles such as garbage trucks, in general, a driver gets out of the driver's cab and operates while checking the work equipment mounted on the vehicle body behind the driver's cab. Many are located outside the cab. In such a work vehicle, for example, when the work switch outside the cab is erroneously operated while the vehicle is stopped, the electric motor directly connected to the traveling battery may start.

  This invention is made | formed in view of such a situation, and it aims at providing the work vehicle which can suppress effectively that a working equipment starts by mistaken operation.

  The present invention is a branch circuit having a battery, an input terminal to which power is input from the battery, and a first output terminal and a second output terminal that branch and output the power input from the input terminal, Connected to the first output end, disposed in the middle of the electric circuit connecting the battery and the input terminal, and opening and closing the electric circuit. A relay circuit for vehicle travel, a work drive unit connected to the second output terminal, receiving power supply from the battery and driving a work device mounted on a vehicle body, the second output terminal, A work vehicle is provided with a work relay circuit that is arranged in the middle of an electric circuit connecting the work drive unit and that can open and close the electric circuit.

  According to the present invention, the battery and the work drive unit are connected via the branch circuit, and the vehicle travel relay circuit that opens and closes the electric circuit is disposed in the middle of the electric circuit connecting the battery and the branch circuit. In addition, a work relay circuit for opening and closing the electric circuit is disposed in the middle of the electric circuit connecting the branch circuit and the work drive unit. That is, two relay circuits for opening and closing the electric circuit are arranged in series in the middle of the electric circuit connecting the battery and the work drive unit. For this reason, when the work drive unit is not driven, for example, if the two relay circuits open two places in the electric path connecting the battery and the work drive unit, the work drive unit may receive power due to an erroneous operation. The possibility of being supplied is reduced. Thereby, it can suppress effectively that a working device starts by erroneous operation.

In the work vehicle, the vehicle body includes a chassis frame and a subframe fixed on the chassis frame and on which the work device is mounted, and the branch circuit is fixed to the subframe. It is preferable.
In this case, since the branch circuit is arranged above the chassis frame, it effectively suppresses the failure of the branch circuit due to water leakage when the work vehicle travels on a flooded road in the event of flooding such as heavy rain or flood. can do. Further, the cost is lower than when the branch circuit is housed in a waterproof housing.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress effectively that a working equipment starts by mistaken operation.

It is a sectional side view of the refuse collection vehicle which is a working vehicle which concerns on one Embodiment of this invention. It is a top view of a refuse collection vehicle. It is a rear view of a garbage truck. It is a schematic side view of the refuse collection vehicle which shows the operation | movement order at the time of dust discharge. It is a hydraulic circuit diagram of a garbage truck. It is a top view of the switch box in a driver's cab. It is an electric circuit diagram of a garbage truck.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side sectional view of a work vehicle according to an embodiment of the present invention. FIG. 2 is a plan view of the work vehicle. 1 and 2, the work vehicle according to the present embodiment includes a dust collection vehicle 1 in which a dust collection device (working device) is mounted on a vehicle body 10 behind the cab 1a. The vehicle body 10 includes a chassis frame 11 and a sub-frame 12 that is placed and fixed on the chassis frame 11. The sub-frame 12 includes a pair of left and right vertical frame portions 12a extending in the vehicle front-rear direction, and a plurality of horizontal frame portions 12b extending in the vehicle width direction between the pair of vertical frame portions 12a.

  The refuse collection vehicle 1 includes a dust storage box 2 mounted on the subframe 12 and a dust input box 3 connected to the rear of the dust storage box 2 as the dust collection device. An opening 2 a is formed on the rear surface of the dust container 2. At the rear part of the dust input box 3, an input port 3a into which dust is input is formed, and a lid 3b that slides the input port 3a up and down to open and close is provided. An opening 3 d for accommodating the dust thrown into the dust throwing box 3 in the dust throwing box 2 is provided at the lower front part of the dust throwing box 3.

  The dust input box 3 can be rotated around a fulcrum 3f provided at the upper portion thereof, and can be opened and closed with respect to the dust storage box 2. As shown by the solid line in the figure, the garbage throwing box 3 closes the opening 2a of the dust container box 2 and opens the opening 2a by rotating upward as shown by the two-dot chain line in the figure. It is designed to rotate between an open position where it can be discharged.

  Next, the loading device T provided in the dust box 3 will be described. The cylinder side base end portion 112a of the pushing cylinder 112 is pivotally attached to the left and right side walls 3c of the dust box 3, so that the pushing cylinder 112 can be rotated. In addition, push plates 108 are attached to the left and right side walls 3c so as to be rotatable about a support shaft 113. The pushing plate 108 is formed by connecting and connecting left and right members having side shapes as shown in the drawing by plates or the like (not shown) extending in the vehicle width direction.

  The upper end portion of the pushing plate 108 and the piston rod tip portion of the pushing cylinder 112 are connected to each other by a pin 114, so that when the pushing cylinder 112 is driven to extend, the pushing cylinder 112 itself is rotated counterclockwise in the figure. The pushing plate 108 is rotated in the clockwise direction in the figure while rotating in the direction shown in FIG. Further, when the pushing cylinder 112 is contracted and driven from this state, the pushing cylinder 112 itself turns in the clockwise direction in the figure while turning the pushing plate 108 in the counterclockwise direction in the figure, and the two-dot chain line in the figure. It will be in the state shown.

  On the left and right side walls 3c, a rotating plate 115 extending in the vehicle width direction is attached to the left and right side walls 3c so as to be rotatable about a support shaft 116. The rotating plate 115 is normally rotated in the clockwise direction in the figure. The inner bottom surface 3 e of the dust box 3 is formed in an arc shape along the turning locus of the tip of the rotating plate 115.

  In the loading device T configured as described above, when dust is thrown into the dust throwing box 3, the rotating plate 115 rises to the illustrated position (9 o'clock position) while stirring dust. Then, when the rotating plate 115 comes to the position shown in the figure, the pushing plate 108 rotates in the clockwise direction in the drawing from the position of the two-dot chain line to the position of the solid line, and the dust placed on the rotating plate 115 is removed. Push it into the dust bin 2. Thereafter, the pushing plate 108 starts to rotate in the counterclockwise direction from the time when the rotating plate 115 exceeds the 12:00 position, and returns to the original position (the position of the two-dot chain line) until the next pushing operation starts. I'm back. Such a periodic operation is performed in one cycle or a continuous cycle.

  On the other hand, a dump cylinder (discharge driving means) 119 is provided below the dust container box 2, and the cylinder-side base end portion 119 a is pivotally attached to the subframe 12. The piston rod side tip 119 b is pivotally attached to the lower surface of the dust container 2. The lower part of the rear end of the dust storage box 2 is supported on the subframe 12 via the support shaft 120 so as to be rotatable up and down. By driving the dump cylinder 119 to extend and contract, the dust storage box 2 is shown in FIG. ) And a landing position shown in FIG. 4A can be turned up and down. Therefore, the dust loaded in the dust container 2 is driven by extending the dump cylinder 119 and rotating (tilting) the dust container 2 upward with respect to the vehicle body 10, so that the dust is moved from the opening 2 a to the outside by its own weight. Discharged.

  FIG. 3 is a rear view of the garbage truck 1. A pair of swing cylinders (input box driving means) 20 disposed at both left and right ends of the dust input box 3 has an upper end attached to the dust container 2 side and a lower end attached to the dust input box 3. When the swing cylinder 20 is driven to extend, the dust input box 3 is rotated upward (opened) (see FIG. 4B), and when it is driven to contract, the dust input box 3 is rotated downward (closed) (FIG. 4). (See (a)).

  With the above configuration, the dust loaded in the dust storage box 2 from the traveling state (the dust input box 3 is in the closed position and the dust storage box 2 is in the landing position) shown in FIG. When the discharging operation for discharging the dust to the outside is performed, first, the swing cylinder 20 is driven to extend, and the dust box 3 is rotated upward. Thereby, the dust box 3 reaches the open position as shown in FIG. From this state, the dump cylinder 119 is expanded and contracted to rotate the dust container 2 upward from the landing position. As a result, the dust container 2 is turned upward to the tilt position as shown in FIG. 4C, and the dust is discharged from the opening 2a to the outside by its own weight.

  FIG. 5 is a hydraulic circuit diagram relating to the pushing cylinder 112, the dump cylinder 119, the swing cylinder 20, and the hydraulic motor 117. This hydraulic circuit includes an oil tank 21, a hydraulic pump 22, a pushing cylinder electromagnetic switching valve 124, a hydraulic motor electromagnetic switching valve 125, a dump cylinder electromagnetic switching valve 126, a swing cylinder electromagnetic switching valve (electromagnetic switching for tailgate locking). 27), switching valve 28, tailgate lock (cylinder) 31, other pressure control valves 196 to 199, check valves 29, 129a to 129f, filter 30 and the like are connected as shown in the figure. .

  The hydraulic motor 117 rotates the rotating plate 115 and constitutes a loading drive means 171 that drives the loading device T together with the pushing cylinder 112. An electric motor 23 is connected to the hydraulic pump 22, and the hydraulic pump 22 is driven by the electric motor 23 to discharge the hydraulic oil, whereby the charging box driving means (swing cylinder) 20 and the discharge driving means (dump cylinder). 119 and the loading drive means 171 are driven. Therefore, the electric motor 23 constitutes a part of the working drive unit D2 that drives the dust collecting device (working device).

  When the solenoid 125n of the hydraulic motor electromagnetic switching valve 125 is excited, the hydraulic motor 117 is driven to rotate forward, and the rotating plate 115 rotates in the clockwise direction in FIG. When the solenoid 125r of the hydraulic motor electromagnetic switching valve 125 is excited, the hydraulic motor 117 is driven in reverse to rotate the rotating plate 115 counterclockwise in FIG.

When the solenoid 124s of the solenoid cylinder switching valve 124 is excited, the push cylinder 112 is driven to contract, and when the solenoid 124e is excited, the push cylinder 112 is driven to extend.
When the solenoid 126s of the dump cylinder electromagnetic switching valve 126 is excited, the dump cylinder 119 is driven to contract, and when the solenoid 126e is excited, the dump cylinder 119 is extended.

  When the dust box 3 is in the closed position (solid line in FIG. 1), the swing cylinder 20 is in the most contracted state, and the swing cylinder electromagnetic switching valve 27 is in the neutral position. The switching valve 28 is in the position shown in FIG. When the solenoid 27e of the swing cylinder electromagnetic switching valve 27 is energized from this state, the tailgate lock 31 operates in the unlocking direction, the swing cylinder 20 is driven to extend, and the dust throwing box 3 rotates upward.

  When the solenoid 27e of the swing cylinder electromagnetic switching valve 27 is demagnetized and the switching valve 28 is energized, the hydraulic oil in the swing cylinder 20 is moved by the dead weight of the dust throwing box 3 into the switching valve 28 and the swing cylinder electromagnetic valve 27. Is returned to the oil tank 21. As a result, the swing cylinder 20 is driven to contract, and the dust box 3 is rotated downward. When the solenoid 27s of the swing cylinder solenoid valve 27 is excited after the dust input box 3 reaches the closed position, the tailgate lock 31 is locked, and the dust input box 3 is locked in the closed position. Thereafter, the solenoid 27 s is demagnetized, but the lock state of the tailgate lock 31 is maintained by the check valve 29.

FIG. 6 is a plan view of the switch box SB1 provided in the cab 1a. The switch box SB1 is provided with a main switch 34, a discharge switch 35, a scraping switch 37, a main lamp 38, and a lock lamp 39.
The main switch 34 is a type of switch that can select any one of “loading”, “OFF”, and “discharge”, and is held at the selected position even when the hand is released. The discharge switch 35 is a type of switch that can select any one of “discharge”, “OFF”, and “return” positions and returns to the “OFF” position when the hand is released.

When the main switch 34 is switched to “loading”, the driving of the pushing cylinder 112 and the hydraulic motor 117 is permitted, and the driving of the dump cylinder 119 and the swing cylinder 20 is restricted. As a result, the switches 42 to 44 of the switch boxes SB2 and SB3 described later can be operated.
On the other hand, when the main switch 34 is switched to “discharge”, the dump cylinder 119 and the swing cylinder 20 are allowed to be driven, and the push cylinder 112 and the hydraulic motor 117 are restricted from being driven. Thereby, the switching operation of the discharge switch 35 becomes possible.

  When the discharge switch 35 is switched to “discharge” while the main switch 34 is switched to “discharge”, the solenoid 27e of the swing cylinder electromagnetic switching valve 27 is excited, and then the dump cylinder electromagnetic switching valve 126 is switched. The solenoid 126e is excited. As a result, as shown in the order of FIGS. 4A to 4C, after the swing cylinder 20 is extended and the dust input box 3 is rotated upward, the dump cylinder 119 is automatically extended and accommodates dust. The box 2 rotates upward to the tilt position.

  When the discharge switch 35 is switched to “return” from this state, the solenoid 126s of the dump cylinder electromagnetic switching valve 126 is energized, the solenoid 27e of the swing cylinder electromagnetic switching valve 27 is demagnetized, and the switching valve 28 is demagnetized. Is excited. As a result, as shown in the order of FIGS. 4C to 4A, after the dump cylinder 119 is driven to contract and the dust container 2 is rotated downward to the landing position by its own weight, the swing cylinder 20 is automatically The dust throwing box 3 is rotated downward by being contracted.

  The scraping switch 37 is a type of switch that can select either “automatic” or “manual” and can hold the selected position even when the hand is released. When the scraping switch 37 is selected to be “automatic”, when the dust input box 3 is rotated to the upper rotation position, an operation similar to loading is automatically performed, and the dust remaining in the dust input box 3 is removed. Can be removed.

  The main lamp 38 is turned on when each switch operation of the switch box SB1 is possible. The lock lamp 39 is lit when the tailgate lock 31 is locked.

  In FIG. 3, switch boxes SB2 and SB3 are provided at the rear portions of the left and right side walls 3c of the dust box 3, respectively. In the present embodiment, the switch box SB2 is provided on the left side wall 3c in the drawing, and the switch box SB3 is provided on the right side wall 3c in the drawing. The switches of the switch boxes SB2 and SB3 can be operated when the main switch 34 is switched to “loading” as described above.

  On the side surface of the switch box SB2, there is provided an operation selection switch 42 for selecting an operation mode of “continuous cycle” or “1 cycle” as the operation of the push plate 108 and the rotating plate 115. On the front face of the switch box SB2, a loading switch (loading operation means) 43 for starting the loading operation in each operation mode and a stop switch 44 for stopping the continuous cycle operation are provided. The stop switch 44 is also provided in the switch box SB3.

  The loading switch 43 is an operation switch that outputs an operation command for driving the pushing cylinder 112 and the hydraulic motor 117 to extend and contract, respectively. The other switches are switches that are used only in an emergency and will not be described in detail.

  1 and 2, the garbage collection vehicle 1 is a vehicle travel drive using a battery 4 mounted on a subframe 12 in a cab back space S (between the cab 1 a and the dust container 2) as a power source. The EV travels by driving the electric motor 5 (see FIG. 7) of the part D1. The battery 4 also serves as a power source for the electric motor 23 (operation drive unit D2) that drives the dust collecting device. The battery 4 of the present embodiment is detachably attached to the subframe 12 and is charged by being removed from the subframe 12 and connected to an external charging device (not shown).

  FIG. 7 is an electric circuit diagram of the garbage truck 1. In FIG. 7, a first plus-side electric circuit Lp1 and a first minus-side electric circuit Ln1 are connected to the battery 4 (voltage value is 400 V, for example). A branch circuit 50 is connected to each downstream end of the first plus-side electric circuit Lp1 and the first minus-side electric circuit Ln1. The branch circuit 50 is configured, for example, by providing three plus side connection ends 51p, 52p, 53p and three minus side connection ends 51n, 52n, 53n in a non-waterproof casing 50a.

A first plus side electric circuit Lp1 and a first minus side electric circuit Ln1 are connected to the plus side connection end 51p and the minus side connection end 51n, respectively. The plus side connection end 51p is connected to the first plus side electric circuit Lp1 from the battery 4. It functions as an input terminal to which electric power is input via.
The other two plus side connection ends 52p and 53p function as a first output end and a second output end that branch and output the power input from the plus side connection end 51p.

A second plus-side electric circuit Lp2 and a second minus-side electric circuit Ln2 are connected to the plus-side connecting end 52p (first output end) and the minus-side connecting end 52n, respectively, and the downstream ends of these electric circuits Lp2 and Ln2 Is connected to a vehicle driving unit D1.
A third positive-side electric circuit Lp3 and a third negative-side electric circuit Ln3 are connected to the positive-side connecting end 53p (second output end) and the negative-side connecting end 53n, respectively, and the downstream ends of these electric circuits Lp3, Ln3 Is connected to the work drive unit D2.

As described above, the branch circuit 50 branches the power input from the battery 4 and outputs the branched power to the vehicle drive unit D1 and the work drive unit D2. As a result, the vehicle drive unit D1 and the work drive unit D2 are driven by receiving power supply from the battery 4.
As shown in FIG. 2, the casing 50 a of the branch circuit 50 is placed and fixed on the upper surface of the horizontal frame 12 b of the subframe 12 below the front end portion of the dust collection box 2. Note that the housing 50 a may be fixed to the side surface of the subframe 12 as long as it is above the chassis frame 11.

  Returning to FIG. 7, the vehicle travel drive unit D <b> 1 includes an inverter 6 and the electric motor 5 connected to the inverter 6. The inverter 6 includes a capacitor 6a (for example, a voltage value of 200 V) connected to the second plus side electric circuit Lp2 and the second minus side electric circuit Ln2. The capacitor 6a charges the electric power supplied to the electric motor 5 in order to drive the AC electric motor 5 stably. The vehicle travel drive unit D <b> 1 may be configured only by the electric motor 5.

  The work drive unit D2 includes an inverter 24 and the electric motor 23 connected to the inverter 24. The inverter 24 includes a capacitor 24a (for example, a voltage value of 200V) connected to the third plus side electric circuit Lp3 and the third minus side electric circuit Ln3. The capacitor 24 a charges the electric power supplied to the electric motor 23 in order to drive the AC electric motor 23 stably. The work drive unit D2 may be configured only by the electric motor 23.

  In the middle of the first plus-side electric circuit Lp1 and the first minus-side electric circuit Ln1, a vehicle travel relay circuit 60 capable of opening and closing these electric circuits Lp1, Ln1 is disposed. The vehicle travel relay circuit 60 of the present embodiment includes, for example, a first relay 61, a second relay 62, a third relay 63, and a limiting resistor 64 in a waterproof housing 60a. The housing 60a is fixed to the vehicle body 10 by a support member (not shown) outside the vehicle body 10 in the vehicle width direction (see FIG. 2).

  The first relay 61 is provided in the middle of the first plus side electric circuit Lp1. The limiting resistor 64 and the second relay 62 are connected in parallel to the first relay 61 in the middle of the first plus-side electric circuit Lp1, and in series with each other in this order from the upstream side (battery 4 side, hereinafter the same). It is connected. The first and second relays 61 and 62 are configured to open and close the first plus-side electric circuit Lp1. The third relay 63 is provided in the middle of the first minus-side electric circuit Ln1, and opens and closes the electric circuit Lp1.

In the vehicle travel relay circuit 60, although not shown, when a key switch provided in a housing that houses the battery 4 is turned on, the relays 61 to 63 are controlled to open and close, and the vehicle 4 is connected to the vehicle. Electric power is supplied to the driving unit D1 for traveling.
Specifically, when the key switch is turned on, the vehicle travel relay circuit 60 first closes the third relay 63 and then closes the second relay 62 from a state in which all the relays 61 to 63 are open. Controlled.

  Then, from the plus side of the battery 4, the first plus side electric circuit Lp1 (the limiting resistor 64, the closed second relay 62), the branch circuit 50 (the plus side connection ends 51p and 52p), the second plus side electric circuit Lp2, the inverter 6 (capacitor 6a), second minus-side electric circuit Ln2, branch circuit 50 (minus-side connecting ends 52n, 51n), first minus-side electric circuit Ln1 (closed third relay 63), and the power returning to the battery 4 A path is formed. Thereby, charging of the capacitor 6a of the inverter 6 is started.

  When a necessary time (for example, 2 seconds) elapses after the second relay 62 is closed until the capacitor 6a is fully charged, the vehicle travel relay circuit 60 then closes the first relay 61 and then The relay 62 is controlled to open.

  Then, from the plus side of the battery 4, the first plus side electric circuit Lp1 (the closed first relay 61), the branch circuit 50 (plus side connection ends 51p, 52p), the second plus side electric circuit Lp2, the inverter 6 (the capacitor 6a). ), The second negative side electric circuit Ln2, the branch circuit 50 (negative side connection ends 52n, 51n), the first negative side electric circuit Ln1 (closed third relay 63), and the electric power path returning to the battery 4 is formed. The As a result, the first plus-side electric circuit Lp1 and the first minus-side electric circuit Ln1 are closed, and electric power is stably supplied from the battery 4 to the electric motor 5 of the vehicle travel drive unit D1.

  When the power supply to the vehicle travel drive unit D1 is cut off from this state, the key switch is turned off. Then, the vehicle travel relay circuit 60 is controlled to open the third relay 63 after opening the first relay 61. As a result, all the relays 61 to 63 are opened, that is, the first plus-side electric circuit Lp1 and the first minus-side electric circuit Ln1 are opened, and the supply of power from the battery 4 to the vehicle travel drive unit D1 is cut off. Is done.

  In the middle of the third plus side electric circuit Lp3 and the third minus side electric circuit Ln3, a working relay circuit 70 capable of opening and closing these electric circuits Lp3, Ln3 is arranged. The working relay circuit 70 of the present embodiment includes, for example, a first relay 71, a second relay 72, a third relay 73, a fourth relay 74, a bypass electric circuit L4, a fifth relay 75, in a waterproof housing 70a. A fuse 76 and a limiting resistor 77 are provided. The casing 70a is fixed to the vehicle body 10 below the battery 4 by a support member (not shown) (see FIG. 2).

  The fuse 76, the first relay 71, the second relay 72, and the limiting resistor 77 are connected in series in this order from the upstream side in the middle of the third plus-side electric circuit Lp3. The third relay 73 is connected in series with the first relay 71 on the downstream side of the first relay 71 in the third plus-side electric circuit Lp3 (capacitor 24a side, hereinafter the same), and the second relay 72 and The limiting resistor 77 is connected in parallel. The 1st-3rd relays 71-73 open and close the 3rd plus side electric circuit Lp3. The 4th relay 74 is provided in the middle of the 3rd minus electric circuit Ln3, and opens and closes the said electric circuit Ln3. The second relay 72 and the limiting resistor 77 may be connected in series in this order from the downstream side.

  The bypass circuit L4 connects the plus-side bypass connection point P1 in the middle of the third plus-side circuit Lp3 and the minus-side bypass connection point P2 in the middle of the third minus-side circuit Ln3. The plus side bypass connection point P <b> 1 is located between the parallel connection point P <b> 3 on the upstream side of the second connection relay 72 and the third connection relay 73 and the first connection relay 71. The minus side bypass connection point P <b> 2 is located downstream of the fourth connection relay 74. The fifth connection relay 75 is provided in the middle of the bypass electric circuit L4 and opens and closes the electric circuit L4.

  In the work relay circuit 70, the first plus-side electric circuit Lp 1 and the first minus-side electric circuit Ln 1 are closed by the vehicle travel relay circuit 60, that is, from the battery 4 through the electric circuits Lp 1, Ln 1 and the branch circuit 50. When the main switch 34 (see FIG. 6) of the switch box SB1 is switched to “loading” or “discharge” in a state where power can be supplied to the third plus side electric circuit Lp3 and the third minus side electric circuit Ln3, The relays 71 to 75 are controlled to open and close, and power is supplied from the battery 4 to the work drive unit D2.

  Specifically, when the main switch 34 is switched to “loading” or “discharge” in a state where the first plus-side electric circuit Lp1 and the first minus-side electric circuit Ln1 are closed, the work relay circuit 70 is connected to each relay. From a state in which all of 71 to 75 are open, first, the fourth relay 74 and the first relay 71 are closed in this order, and then the second relay 72 is closed.

  Then, from the plus side of the battery 4, the first plus side electric circuit Lp1 (first relay 61 being closed), the branch circuit 50 (plus side connection ends 51p, 53p), the third plus side electric circuit Lp3 (fuse 76, closed). First relay 71 and second relay 72, limiting resistor 77), inverter 24 (capacitor 24a), third negative circuit Ln3 (closed fourth relay 74), branch circuit 50 (negative connection terminals 53n and 51n). ), An electric power path is formed that returns to the battery 4 through the first negative-side electric circuit Ln1 (the closed third relay 63). Thereby, charging of the capacitor 24a of the inverter 24 is started. At this time, since the limiting resistor 77 exists in the third plus-side electric circuit Lp3, it is effective that an inrush current that causes welding of the contacts of the relays 61, 71, 72 and the fuse 76 flows in the power path. Can be prevented.

  When a necessary time (for example, 2 seconds) elapses after the second relay 72 is closed until the capacitor 24a is completely charged, the work relay circuit 70 then closes the third relay 73 and then the second relay. 72 is controlled to open.

  Then, from the plus side of the battery 4, the first plus side electric circuit Lp1 (first relay 61 being closed), the branch circuit 50 (plus side connection ends 51p, 53p), the third plus side electric circuit Lp3 (fuse 76, closed). First relay 71 and third relay 73), inverter 24 (capacitor 24a), third negative circuit Ln3 (closed fourth relay 74), branch circuit 50 (negative connection terminals 53n and 51n), first An electric power path that passes through the negative electric circuit Ln1 (the closed third relay 63) and returns to the battery 4 is formed. As a result, the third plus-side electric circuit Lp3 and the third minus-side electric circuit Ln3 are closed, and power is stably supplied from the battery 4 to the electric motor 23 of the work drive unit D2.

  In order to cut off the power supply to the work drive unit D2 from this state, the main switch 34 (see FIG. 6) of the switch box SB1 is switched to “OFF”. Then, in the work relay circuit 70, the relays 71 to 75 are controlled to open and close, and the power supply from the battery 4 to the work drive unit D2 is cut off.

  Specifically, when the main switch 34 is switched to “OFF”, the work relay circuit 70 starts from the state where the first relay 71, the third relay 73, and the fourth relay 74 are closed, first, the third relay 73. The fourth relay 74 and the first relay 71 are controlled to open in this order. Thereby, all the relays 71-75 will be in the state opened once.

  Next, the work relay circuit 70 is controlled to close the fifth relay 75 after closing the second relay 72. Then, from the plus side of the capacitor 24a of the inverter 24, the third plus side electric circuit Lp3 (the limit resistor 77, the closed second relay 72, between the parallel connection point P3 and the plus side bypass connection point P1), the bypass electric circuit L4. A power path is formed that passes through the (closed fifth relay 75) and the third minus-side electric circuit Ln3 (downstream from the minus-side bypass connection point P2) and returns to the capacitor 24a. Thereby, discharging of the capacitor 24a is started.

  When a necessary time (for example, 2 seconds) elapses after the fifth relay 75 is closed until the discharge of the capacitor 24a is completed, the work relay circuit 70 opens the fifth relay 75 and then the second relay. 72 is controlled to open. As a result, all the relays 71 to 75 are opened, that is, the third plus-side electric circuit Lp3 and the third minus-side electric circuit Ln3 are opened, and the power supply from the battery 4 to the work drive unit D2 is cut off. .

  According to the garbage truck 1 of the present embodiment configured as described above, the battery 4 and the work drive unit D2 are connected via the branch circuit 50, and the battery 4 and the branch circuit 50 are connected. A vehicle travel relay circuit 60 that opens and closes the electric circuits Lp1 and Ln1 is arranged in the middle of the electric circuits Lp1 and Ln1, and the electric circuit Lp3 is arranged in the middle of the electric circuits Lp3 and Ln3 that connect the branch circuit 50 and the work drive unit D2. , Ln3 is provided with a working relay circuit 70. That is, two relay circuits 60 and 70 for opening and closing the electric circuit are arranged in series in the middle of the electric circuit connecting the battery 4 and the work drive unit D2.

  For this reason, for example, when the driver and the operator are present in or near the driver's cab 1a when the driver for driving D2 is not driven, there is a high possibility of driving the driver for driving vehicle D1. In the state where electric power is supplied from the battery 4 to the vehicle travel drive unit D1 by the vehicle travel relay circuit 60, only one point in the middle of the electric path connecting the battery 4 and the work drive unit D2 by the work relay circuit 70 Just open it.

  As a result, the possibility of power being supplied to the work drive unit D2 by an erroneous operation is reduced while enabling the drive unit for vehicle travel D1 to be driven, so that it is possible to effectively prevent the dust collecting device from being started by an erroneous operation. can do. In particular, when the vehicle is temporarily stopped while the vehicle is running, the switch box SB2 and the like outside the vehicle are easily operated and effective.

  Moreover, the case where the garbage collection vehicle 1 is stored in a parking lot etc. as the situation which does not drive the drive part D2 for work can be considered. In this case, since the driver and the worker are away from the vehicle and are not likely to drive the vehicle travel drive unit D1, the vehicle travel relay circuit 60 and the work relay circuit 70 use the battery 4 and the work drive unit D2. It is only necessary to open two places in the middle of the electric circuit connecting the. Thereby, since possibility that electric power will be supplied to the work drive part D2 by erroneous operation becomes quite low, it can suppress effectively that a dust collection apparatus starts by erroneous operation.

  Further, since the branch circuit 50 is disposed on the upper surface of the subframe 12 fixed on the chassis frame 11, the branch circuit 50 is branched when the garbage collection vehicle 1 travels on a flooded road in the event of flood damage such as heavy rain or flood. It is possible to effectively suppress the failure of the circuit 50 due to water leakage. In addition, the cost is lower than when the branch circuit 50 is housed in a waterproof housing.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, the loading device T of the present embodiment is a rotary plate type that loads dust with the cooperation of the push plate 108 and the rotary plate 115, but may be a press type that loads dust only with the push plate. Moreover, although the refuse collection vehicle 1 of this embodiment discharges the dust to the outside by dumping the dust storage box 2, the dust is sent to the outside by a discharge plate provided to be movable back and forth in the dust storage box. It may be discharged.

  The work drive unit D2 of the present embodiment drives the dust collecting device via the hydraulic pump 22 and the hydraulic actuator (swing cylinder 20, push cylinder 112, hydraulic motor 117, dump cylinder 119). The dust collecting device may be driven directly. Further, the branch circuit 50 may be fixed to the chassis frame 11 other than the subframe 12. Moreover, this invention is applicable also to the work vehicle carrying other work equipment besides a garbage collection vehicle.

1 Garbage truck (work vehicle)
4 Battery 10 Car body 11 Chassis frame 12 Subframe 50 Branch circuit 51p Positive side connection end (input end)
52p Positive connection end (first output end)
53p Positive connection end (second output end)
60 relay circuit for vehicle travel 70 relay circuit for work D1 drive unit for vehicle travel D2 drive unit for work

Claims (2)

Battery,
A branch circuit having an input terminal to which power is input from the battery, and a first output terminal and a second output terminal for branching and outputting the power input from the input terminal;
A vehicle travel drive unit that is connected to the first output end and travels by receiving power supply from the battery;
A vehicle travel relay circuit that is arranged in the middle of an electric circuit connecting the battery and the input end, and capable of opening and closing the electric circuit;
A work drive unit that is connected to the second output end and that receives power supply from the battery and drives a work device mounted on a vehicle body;
A work vehicle comprising: a work relay circuit that is disposed in the middle of an electric circuit connecting the second output end and the work drive unit and capable of opening and closing the electric circuit. The vehicle body includes a chassis frame, and a subframe fixed on the chassis frame and mounted with the work equipment.
The work vehicle according to claim 1, wherein the branch circuit is fixed to the subframe.

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