JP5836033B2 - Tractor power extraction structure - Google Patents

Description

The present invention relates to a tractor comprising a seating sensor for detecting seating and seating with respect to a driver's seat, and a control means for preventing driving of a vehicle body and driving of a PTO shaft for taking out power in response to the seating detection of the seating sensor. The present invention relates to a working power take-out structure.

In the tractor , when the control means detects the departure from the driver's seat based on the detection of the seating sensor, the engine is automatically stopped to prevent driving of the vehicle body and driving of the PTO shaft for power extraction, and In some cases, the engine is not automatically stopped when an operation to the non-use position of the driver seat is detected based on the detection of the non-use detection sensor (see, for example, Patent Document 1).

JP 2004-68705 A

In the above configuration, by utilizing the power from the PTO shaft in a state of stopping the vehicle, room for Oite improvement stationary work on any such irrigation work or wood-splitting operation by driving the pump or the like or wood-splitting device for irrigation There is.

According to a first aspect of the present invention, there is provided a seating sensor for detecting the seating and the seating with respect to the driver's seat, and a control means for preventing the driving of the vehicle body and the driving of the PTO shaft for taking out the power accompanying the seating detection of the seating sensor. In the structure for taking out the working power of the tractor ,
A parking brake lever that enables a braking operation of the vehicle body, and a detecting means that detects an operation position of the parking brake lever,
When the control means detects a braking operation of the vehicle body by the parking brake lever based on the detection by the detection means, it ignores the travel start command based on the travel start operation and allows the driving of the PTO shaft. It is configured.
According to a second aspect of the present invention, there is provided a seating sensor for detecting seating and seating with respect to the driver's seat, and control means for preventing driving of the vehicle body and driving of the PTO shaft for taking out the power accompanying the seating detection of the seating sensor. In the structure for taking out the working power of the tractor ,
An electric motor that drives the PTO shaft, a battery that supplies electric power to the electric motor, a parking brake lever that enables a braking operation of the vehicle body, and detection means that detects an operation position of the parking brake lever,
When the control unit detects a braking operation of the vehicle body by the parking brake lever based on the detection by the detection unit, the control unit ignores the travel start command based on the travel start operation and drives the PTO shaft by the electric motor. Is configured to be allowed.

According to the second aspect of the invention, it is possible to perform the stationary work with the power from the PTO shaft driven by the power from the battery without operating the engine. Then, it is possible to the vehicle body when a fixed-location operation is avoided in advance the possibility that the travel unexpectedly.
Therefore, the stationary work can be performed without incurring fuel consumption, and the vehicle body can be prevented from traveling during the stationary work.

According to a third invention, in the first invention,
Configured to allow charging from an external power source to the battery mounted on the car body,
The control means is configured to allow the driving of the PTO shaft when detecting a braking operation of the vehicle body by the parking brake lever based on detection of the detection means during charging of the battery from the external power source. It is.
According to a fourth invention, in the second invention,
Configured to allow charging from an external power source to the battery,
Allowing the electric motor to drive the PTO shaft when the control means detects a braking operation of the vehicle body by the parking brake lever based on detection by the detection means during charging of the battery from the external power source. It is comprised so that it may do.

According to the third and fourth aspects of the invention, it is possible to perform the stationary work even while charging the battery from the external power source, and to improve the work efficiency. In addition, the vehicle body can be prevented from traveling during charging.

It is a whole right side view of an electric tractor. It is a schematic plan view which shows the control structure of an electric tractor. It is a block diagram which shows the control structure of an electric tractor. It is a front view of a main switch. It is a vertical side view of the principal part which shows the attachment / detachment structure of a main switch. It is a vertical side view of the principal part which shows the chargeable state which removed the main switch. It is a schematic plan view which shows the transmission structure of the tractor in another embodiment.

As an example of a mode for carrying out the present invention, the working power extraction structure of the tractor according to the present invention will be described with reference to the drawings an embodiment applied to an electric tractor is an example of a tractor.

  As shown in FIGS. 1 and 2, the electric tractor illustrated in this embodiment includes a hydraulic type tractor at the rear of a vehicle body that includes left and right front wheels 1 as steering wheels and left and right rear wheels 2 as driving wheels. A pair of left and right lift arms 3 that move up and down by the operation of a lift cylinder (not shown), a PTO shaft 4 that enables the extraction of working power to the outside, and the like are provided. As a result, this electric tractor can be connected to a working device (not shown) such as a rotary tiller or plow so that it can be driven up and down and supplied to a drive-type working device such as a rotary tiller. It is configured so that the power to be taken out can be taken out.

  A boarding operation unit 5 is formed in the rear half of the vehicle body. The boarding operation unit 5 includes a key-operated main switch 6, a steering wheel 7 for front wheel steering, an accelerator pedal 8 that automatically returns to the depression release position, a position-retaining vehicle speed setting lever 9, and a position-retaining forward / reverse switching. Various operating tools such as a lever 10, a pair of left and right brake pedals 11 that automatically return to the depression release position, a position-retaining parking brake lever 12, a position-retaining lift lever 13, and a position-retaining PTO lever 14 And a driver's seat 15. The driver's seat 15 is configured to be able to change the position between a use position where the seating can be performed and a non-use position where the seating is prevented by a swinging operation using the left and right support shaft 16 provided at the front thereof as a fulcrum. .

  As shown in FIGS. 2 and 3, the left and right rear wheels 2 are driven by left and right traveling motors 17. Various hydraulic actuators such as a lift cylinder are provided with an electro-hydraulic control unit 20 including various hydraulic devices such as an electromagnetic control valve (not shown) that controls the flow rate of oil from a hydraulic pump 19 driven by a pump motor 18. It drives properly by controlling through the The PTO shaft 4 is driven by a work motor 21. An in-wheel type AC motor is employed for the left and right traveling motors 17. An AC motor is adopted as the pump motor 18 and the work motor 21.

  This electric tractor is equipped with a control device (control means) 100 composed of a plurality of electronic control units equipped with a microcomputer or the like. The control device 100 is activated by the electric power from the charge / discharge battery 22 or the auxiliary battery 23 obtained by operating the main switch 6 to the “ON” position or “CHARGE” position. Further, when the power from the battery 22 or the auxiliary battery 23 is cut off by the operation of the main switch 6 to the “off” position, a power supply state is maintained for a predetermined time by a self-holding circuit (not shown) provided therein. Are stored in the EEPROM at the stage when the main switch 6 is operated to the “OFF” position, and then the power supply by the self-holding circuit is stopped and the operation is stopped with a lapse of a predetermined time.

  Electric power from the battery 22 or the auxiliary battery 23 is supplied to the motors 17, 18, and 21 through the drive control unit 24 of the control device 100. The drive control unit 24 controls the amount of power supplied to each of the motors 17, 18, and 21 based on a control command from the operation control unit 25 of the control device 100 that controls the operation of the electrohydraulic control unit 20 and the like. Each motor 17, 18, 21 is driven appropriately. Based on information from the information management unit 26 of the control device 100 that manages output information from information output means such as various switches and sensors, the operation control unit 25 sends a control command suitable for the information to the electrohydraulic control unit. 20 and the drive control unit 24.

  The drive control unit 24, the operation control unit 25, the information management unit 26, and the like are connected so as to be able to communicate with each other and supply power via an in-vehicle LAN or an in-vehicle power line.

  The information managed by the information management unit 26 includes the operation position of the main switch 6, the depression amount of the accelerator pedal 8 detected by the accelerator sensor 27, the operation position of the vehicle speed setting lever 9 detected by the vehicle speed setting sensor 28, and the forward / reverse sensor 29 indicates the operation position of the forward / reverse switching lever 10, the steering angle sensor 30 detects the steering angle of the front wheel 1 inside the turn, the operation angle from the rectilinear position of the pitman arm 31, and a parking brake switch (an example of detection means) 32. The operation position of the parking brake lever 12 detected by the vehicle, the operation position of the lift lever 13 detected by the lift sensor 33, the operation position of the PTO lever 14 detected by the PTO sensor 34, and whether or not the driver seat 15 is detected by the seat sensor 35 , And the operation position of the driver's seat 15 detected by the seat switch (an example of detection means) 36.

  From the above configuration, the control device 100 controls the rotational speed of the left and right traveling motors 17 based on the amount of depression of the accelerator pedal 8 and the operation position of the vehicle speed setting lever 9, and the like. Forward / reverse switching control for switching the rotation direction of the left and right traveling motors 17 based on the operation position, differential control for differentiating the left and right rear wheels 2 based on the steering angle of the front wheels 1, and the operation position of the lift lever 13 Ascending / descending control for moving the lift arm up and down based on the above, and PTO driving control for switching the working motor 21 between the operating state and the stopping state based on the operation position of the PTO lever 14 can be performed.

  The drive control unit 24 includes a power supply switching unit 37, a power supply switching unit 38, a pump inverter 39, a travel inverter 40, and a work inverter 41. Based on the power supply switching command from the operation control unit 25, the power supply switching unit 37 switches between a state where the power source is the battery 22, a state where the auxiliary battery 23 is used, and a state where both are used. The power supply switching unit 38 is configured to supply power to the pump inverter 39 based on the power supply switching command from the operation control unit 25, to supply power to the pump inverter 39 and the traveling inverter 40, and to the pump inverter 39. And it switches to the state supplied to the inverter 41 for work, and the state supplied to each inverter 39-41. The pump inverter 39 supplies power to the pump motor 18 to drive the hydraulic pump 19 appropriately. The travel inverter 40 controls the drive control current (for example, PWM signal) supplied to the left and right travel motors 17 on the basis of the speed command from the operation control unit 25 to appropriately adjust the rotation speeds of the left and right travel motors 17. Change to The work inverter 41 supplies electric power to the work motor 21 to drive the PTO shaft 4 appropriately.

  The operation control unit 25 includes an execution mode switching unit 42, a power supply switching command unit 43, a power supply switching command unit 44, and a speed command unit 45. When the information management unit 26 detects the operation of the main switch 6 to the “ON” position, the execution mode switching unit 42 detects seating on the driver seat 15 based on the detection of the seating sensor 35. On the basis of this detection, a power supply mode is executed that enables power supply from the battery 22 and the auxiliary battery 23 to the motors 17, 18, 21, etc., and enables the vehicle to run, drive the PTO shaft 4, and the like. Further, when the information management unit 26 detects the departure from the driver's seat 15 based on the operation of the main switch 6 to the “OFF” position or the detection of the seating sensor 35, the battery 22 and the auxiliary are detected based on the detection. Power supply from the battery 23 to the motors 17, 18, 21, etc. is stopped, and a standby mode is executed to prevent the vehicle from running or driving the PTO shaft 4. On the other hand, when the information management unit 26 detects an operation of the main switch 6 to the “charging” position, a charging mode that enables charging of the battery 22 and the auxiliary battery 23 from the external power source 46 based on the detection. Execute. The parking brake lever 12 is released from the braking release position based on the detection of the parking brake switch 32 or the seat switch 36 while the information management unit 26 detects the operation of the main switch 6 to the “charge” position. When the operation or the operation to the non-use position of the driver's seat 15 is detected, the battery 22 and the auxiliary battery 23 can be charged based on the detection, and the pump motor 18 and the work are performed from the battery 22 and the auxiliary battery 23. The charging stationary operation mode is executed that enables power supply to the motor 21 and enables the left and right lift arms 3 and the PTO shaft 4 to be driven.

  When the information management unit 26 detects that the voltage of the battery 22 exceeds the set value based on the detection by the battery voltage detector 47 in the power supply mode, the power supply switching command unit 43 detects the voltage change. Based on this, the power supply switching unit 37 of the drive control unit 24 is commanded to use the battery 22 as a power source. Further, when the information management unit 26 detects a voltage drop below the set value of the battery 22 based on the detection of the voltage detector 47, the power management unit 22 of the drive control unit 24 supplies auxiliary power from the battery 22 of the power source based on the detection. Command to switch to battery 23. Thereafter, when the information management unit 26 detects recovery due to cooling of the battery 22 or the like based on the detection of the voltage detector 47, the battery 22 and the auxiliary battery 23 are supplied with power to the power switching unit 37 of the drive control unit 24 based on the detection. Command to switch both.

  The power supply switching command unit 44 instructs the power supply switching unit 38 of the drive control unit 24 to supply power to the pump inverter 39 in the power supply mode and the charging stationary work mode. In the standby mode, the power supply switching unit 38 of the drive control unit 24 is instructed to stop power supply to each of the inverters 39 to 41.

  In the power supply mode, when the information management unit 26 detects an operation of depressing the accelerator pedal 8 or an operation of the vehicle speed setting lever 9 to a position other than the zero speed position based on the detection of the accelerator sensor 27 or the vehicle speed setting sensor 28, based on the detection. The power supply switching unit 38 of the drive control unit 24 is instructed to supply power to the traveling inverter 40. Thereafter, when the information management unit 26 detects the return to the depression release position of the accelerator pedal 8 and the operation of the vehicle speed setting lever 9 to the zero speed position based on the detection of the accelerator sensor 27 and the vehicle speed setting sensor 28, the detection is performed. Based on this, the power supply switching unit 38 of the drive control unit 24 is instructed to stop power supply to the traveling inverter 40. Further, when the information management unit 26 detects the operation of the PTO lever 14 to the “ON” position based on the detection of the PTO sensor 34, the information management unit 26 sends the power supply switching unit 38 of the drive control unit 24 to the work inverter 41. The power supply is commanded. Thereafter, when the information management unit 26 detects an operation to the “OFF” position of the PTO lever 14 based on the detection of the PTO sensor 34, the information management unit 26 sends the power supply switching unit 38 of the drive control unit 24 to the work inverter 41 based on the detection. Command to stop power supply.

  Whether the information management unit 26 detects an operation of depressing the accelerator pedal 8 or an operation of the vehicle speed setting lever 9 to a position other than the zero speed position based on the detection of the accelerator sensor 27 or the vehicle speed setting sensor 28 in the charging stationary work mode. Regardless, the power supply switching unit 38 of the drive control unit 24 is instructed to stop power supply to the traveling inverter 40. Further, when the information management unit 26 detects the operation of the PTO lever 14 to the “ON” position based on the detection of the PTO sensor 34, the information management unit 26 sends the power supply switching unit 38 of the drive control unit 24 to the work inverter 41. The power supply is commanded. Thereafter, when the information management unit 26 detects an operation to the “OFF” position of the PTO lever 14 based on the detection of the PTO sensor 34, the information management unit 26 sends the power supply switching unit 38 of the drive control unit 24 to the work inverter 41 based on the detection. Command to stop power supply.

  Based on the detection of the accelerator sensor 27, the vehicle speed setting sensor 28, the rudder angle sensor 30 and the like by the information management unit 26, the speed command unit 45 includes a depression operation amount of the accelerator pedal 8, an operation position of the vehicle speed setting lever 9, and When the steering angle of the front wheel 1 inside the turn is detected, the necessary rotational speed of each traveling motor 17 is obtained based on the detected information, and the driving control current corresponding to the necessary rotational speed is transmitted to each traveling motor 17. Is supplied to the traveling inverter 40.

  From the above configuration, after the operation of the main switch 6 to the “ON” position, when the seating on the driver seat 15 is not detected, the execution mode becomes the standby mode and the vehicle body travels and the left and right lift arms 3 and Driving of the PTO shaft 4 can be prevented. Further, when the seating on the driver's seat 15 is detected, the execution mode becomes the power feeding mode, and it is possible to drive the vehicle body and drive the left and right lift arms 3 and the PTO shaft 4. Further, when the main switch 6 is operated to the “charge” position, the execution mode becomes the charge mode, and the battery 22 and the auxiliary battery 23 can be charged. In this charging mode, the execution mode becomes the charging stationary work mode by performing the braking operation by the parking brake lever 12 or the swinging operation of the driver seat 15 to the non-use position. The left and right lift arms 3 and the PTO shaft 4 can be driven while blocking.

  As a result, while avoiding the inconvenience that the vehicle body travels during charging, irrigation work by connecting an irrigation pump, a splitting device, etc. to the PTO shaft 4 and driving it with power from the PTO shaft 4 It can perform stationary work such as chopping work.

  Charging of the battery 22 and the auxiliary battery 23 from the external power source 46 is performed via the charge control unit 48 of the control device 100. The charging control unit 48 includes an AC-DC converter 49 and a DC-DC converter 50. That is, power from an external power supply 46 that is a commercial power supply is converted from AC to DC by an AC-DC converter 49, converted to a voltage according to specifications by a DC-DC converter 50, and then supplied to the battery 22 and the auxiliary battery 23. To do.

  As shown in FIGS. 4 to 6, in the operation state in which the key cylinder 52 is in the “OFF” position with respect to the cylinder holder 51, the main switch 6 has a contact (not shown) on the key cylinder side provided therein as a cylinder. By separating from each contact (not shown) on the holder side, energization from the battery 22 and the auxiliary battery 23 to the control device 100 is blocked. When the key cylinder 52 is in the “on” position or the “charge” position, the contact on the key cylinder side contacts the first contact or the second contact on the cylinder holder side. The control device 100 is energized.

  When the information management unit 26 detects the operation of the main switch 6 to the “charge” position, the charge control unit 48 of the control device 100 detects the power supply state by the self-holding circuit from the power supply state via the main switch 6 based on the detection. The power supply state by the self-holding circuit is maintained until the information management unit 26 detects the operation of the main switch 6 to the “OFF” position.

  Further, the electromagnetic switch 56 is retracted by energizing the electromagnetic cylinder 56 that holds the main switch 6 in a state of being attached to the main switch mounting portion 55 of the control panel 54 by engagement with the recess 53 formed in the cylinder holder 51. Thus, the main switch 6 can be removed from the main switch mounting portion 55.

  A charging connection terminal 57 on the vehicle body side is disposed on the back of the main switch 6 in a state of being pushed and urged to the main switch side by a compression spring 58, whereby the main switch 6 is arranged in the main switch mounting portion 55. And the charging connection terminal 57 on the vehicle body side can be moved to the vicinity of the opening of the main switch mounting portion 55.

  Further, the main switch mounting portion 55 is equipped with a terminal support tool 59 made of a leaf spring that retreats and swings downward when in contact with the main switch 6 when the main switch 6 is mounted. The terminal support tool 59 protrudes and swings upward as the main switch 6 is detached from the main switch mounting portion 55, and the free end portion 60 engages with the back surface of the charging connection terminal 57 on the vehicle body side. The vehicle body side charging connection terminal 57 is configured to be prevented from moving to the back side.

  From the above configuration, the charging switch terminal 61 on the external power supply side can be connected to the charging connection terminal 57 on the vehicle body side by operating the main switch 6 to the “charging” position and removing it from the main switch mounting portion 55. The battery 22 and the auxiliary battery 23 can be charged.

  When the information management unit 26 detects the operation of the main switch 6 to the “OFF” position after the charging is completed and the main switch 6 is mounted on the main switch mounting unit 55, the charging control unit of the control device 100. 48 stops the energization of the electromagnetic cylinder 56 based on the detection, causes the electromagnetic cylinder 56 to project and engage with the recess 53 of the cylinder holder 51, so that the main switch mounting portion 55 of the main switch 6 can be engaged. To prevent the removal.

  Reference numeral 62 shown in FIGS. 5 and 6 is an energizing contact provided in the cylinder holder 51 of the main switch 6, and reference numeral 63 is a cylinder associated with the attachment of the main switch 6 to the main switch mounting portion 55. This is a contact for energization on the side of the main switch mounting portion that contacts the contact 62 of the holder 51. Reference numeral 64 denotes an engaging groove for positioning that determines the mounting posture in the operation direction of the main switch 6 with respect to the main switch mounting portion 55 by engagement with the protrusion 65 formed on the opening side of the main switch mounting portion 55. It is.

    [Another embodiment]

[1] As shown in FIG. 7, the tractor is a traveling transmission system that transmits power to the left and right front wheels 1 and the left and right rear wheels 2 via an engine 66 and a transmission 67 that shifts power from the engine 66. 68 may be provided. Although not shown in the drawings, a traveling electric motor is provided instead of the engine 66, and the power from the traveling electric motor is transmitted to the left and right front wheels 1 and the left and right rear wheels 2 via a traveling transmission system 68. It may be configured to do so.

[2] As the detection means 32 and 36, in the case of including a tilt mechanism capable of operating the steering wheel 7 to the uncontrollable position, even if the operation of the steering wheel 7 to the uncontrollable position is detected. Good.

[3] A DC motor may be adopted as the electric motor 21.

The tractor working power take-out structure according to the present invention can be applied to various tractors .

4 PTO shaft 12 Parking brake lever 15 Driving seat 21 Electric motor 22 Battery 23 Battery 32 Detection means 35 Seating sensor 36 Detection means 46 External power supply 100 Control means

Claims (4)

Working power retrieval of a tractor comprising a seating sensor for detecting seating and seating with respect to a driver's seat and a control means for preventing driving of a vehicle body and driving of a PTO shaft for power removal upon detection of seating of the seating sensor In structure
A parking brake lever that enables a braking operation of the vehicle body, and a detecting means that detects an operation position of the parking brake lever,
When the control means detects a braking operation of the vehicle body by the parking brake lever based on the detection by the detection means, it ignores the travel start command based on the travel start operation and allows the driving of the PTO shaft. The structure for taking out the working power of the tractor configured in Working power retrieval of a tractor comprising a seating sensor for detecting seating and seating with respect to a driver's seat and a control means for preventing driving of a vehicle body and driving of a PTO shaft for power removal upon detection of seating of the seating sensor In structure
An electric motor that drives the PTO shaft, a battery that supplies electric power to the electric motor, a parking brake lever that enables a braking operation of the vehicle body, and detection means that detects an operation position of the parking brake lever,
When the control unit detects a braking operation of the vehicle body by the parking brake lever based on the detection by the detection unit, the control unit ignores the travel start command based on the travel start operation and drives the PTO shaft by the electric motor. A structure for taking out working power of a tractor that is configured to allow the above. Configured to allow charging from an external power source to the battery mounted on the car body,
The control means is configured to allow the driving of the PTO shaft when detecting a braking operation of the vehicle body by the parking brake lever based on detection of the detection means during charging of the battery from the external power source. The structure for taking out the working power of the tractor according to claim 1. Configured to allow charging from an external power source to the battery,
Allowing the electric motor to drive the PTO shaft when the control means detects a braking operation of the vehicle body by the parking brake lever based on detection by the detection means during charging of the battery from the external power source. The structure for taking out the working power of the tractor according to claim 2, which is configured as described above.

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