Work vehicles

Abstract

To solve a conventional problem requiring an operation of a main shift lever and an output to an infinite variable-speed drive during a drive of a work vehicle and requiring a fine operation to make the work vehicle, which makes it difficult to adjust an intended vehicle speed.SOLUTION: A work vehicle is provided with a drive device 2 that travels on a farm field, a control part 6, a work device 4 that performs grounding work, and a drive brake 11 that reduces and stops the transmission to the drive device 2. The work vehicle is further provided with a low-speed forward advancement controller 12 that makes the vehicle advance at low speed. The low-speed advancement controller 12 is arranged at a distance from the operation part 6 and is provided with a switching actuator 13 that switches the drive brake 11 between a lock state and an unlock state. When the drive brake 11 is in the lock state, operation of the low-speed advancement controller 12 can be received and also the switching actuator 13 is operated to switch the lock state of the drive brake 11 into the unlock state, which enables the work vehicle to advance at low speed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] Conventional combine harvesters have a known configuration in which the operating position of the sub-transmission lever is set to a low-speed mode (L mode) that transmits power to the traveling system at a speed slower than the road traveling speed, enabling low-speed traveling that is suitable for loading and unloading the machine, entering and exiting fields, and traveling within storage areas such as barns (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-034750 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned known example, when driving, it is necessary to operate the main speed change lever to output to the continuously variable transmission, and when driving at slow speeds, fine operation is required, which makes it difficult to adjust to the intended speed. Furthermore, if an operator touches the main speed change lever and operates it to the speed-up side, the traveling speed will increase, reducing the safety of travel, and if the operator operates it to the speed-down side, the output will fall below the ground resistance, making it impossible to travel. In addition, with the past, the operator had to get into the control panel and operate the vehicle at a slow speed, which meant that when loading and unloading or entering and exiting the field, the operator had to align the crawlers of the traveling device without being able to visually check whether they were in the correct position relative to the loading platform (ayumi), and so another operator was required to check. Therefore, when loading and unloading is done by one person, the worker must get on and off the machine to check the alignment, which reduces work efficiency. The present invention allows the machine to travel at slow speeds easily, making it possible for one person to operate the machine. [Means for solving the problem]

[0005] The invention of claim 1 is a work vehicle comprising a traveling device 2 for traveling in a field, a control unit 6, a working device 4 for performing ground work, and a traveling brake 11 for damping or stopping the transmission of power to the traveling device 2, wherein a slow speed forward controller 12 is provided for moving the machine body forward at a slow speed, the slow speed forward controller 12 is located in a position away from the control unit 6, and a switching actuator 13 is provided for switching the traveling brake 11 between a locked state and an unlocked state, so that when the traveling brake 11 is in a locked state, operation of the slow speed forward controller 12 can be accepted, and the switching actuator 13 is activated to switch the traveling brake 11 to an unlocked state, thereby moving the machine body forward at a slow speed. The invention of claim 2 is a work vehicle characterized in that a main speed change lever 14 for controlling the forward and backward movement output of the machine is provided on the control unit 6, a lever sensor 15 for detecting the operating position of the main speed change lever 14 is provided at a predetermined position, a movement sensor 16 for detecting movement of the machine is provided at a predetermined position, the switching actuator 13 is configured to switch the traveling brake 11 to a locked state when the brake pedal 17 is depressed continuously for a predetermined time when the lever sensor 15 detects the neutral position of the main speed change lever 14 and the movement sensor 16 is not detecting movement of the machine, and the slow speed forward controller 12 is provided on the working device 4 on the front side of the machine, and the slow speed forward controller 12 can be operated while away from the machine by pulling out the harness 18 of the slow speed forward controller 12. The invention of claim 3 is a work vehicle characterized in that the slow-speed forward controller 12 is configured to not accept operation unless the harness 18 is pulled out from the mounting position of the work implement 4, and the slow-speed forward controller 12 causes slow forward movement when operated, and stops slow forward movement when not operated. The invention of claim 4 is a work vehicle characterized in that it is configured so that a working seat 25 capable of detecting the presence of a worker is provided in the operating section 6, an engine 26 capable of detecting rotation speed is mounted, a continuously variable transmission 27 is provided for transmitting the driving force of the engine 26 as forward / reverse movement and traveling speed, an auxiliary transmission 28 is provided in a predetermined position for switching the transmission path between the continuously variable transmission 27 and the traveling device 2, a working height sensor 29 is provided in a predetermined position for detecting the up and down position of the working device 4, a vehicle height sensor 30 is provided in a predetermined position for detecting the vehicle height of the machine body, and operation of the slow forward controller 12 can be accepted when the operating position of the main speed change lever 14 is in the "neutral" position, the auxiliary transmission 28 is in the "travel" position, the seating position of the working seat 25 is "away", the traveling brake 11 is "locked", the working height sensor 29 detects the "highest", the vehicle height sensor 30 detects the "lowest", and the rotation speed of the engine 26 is "idling". The invention of claim 5 is a work vehicle characterized in that it is provided with an alarm device 35 that operates before the vehicle starts moving forward at slow speed, while it is operating, and when the conditions for moving forward at slow speed are not met, and at the start of moving forward at slow speed, the rotation speed of the engine 26 is increased from "idling" to "minimum driving output", and the output of the continuously variable transmission 27 is increased from the rotation of the neutral position to a set value in proportion to the increase in the rotation speed of the engine 26, and when the rotation speed of the engine 26 and the output of the continuously variable transmission 27 reach a state suitable for moving forward at slow speed, the switching actuator 13 is activated and the traveling brake 11 is switched to an unlocked state. The invention of claim 6 is a work vehicle characterized in that the slow speed forward controller 12 is provided with a slow speed forward switch 37 that causes slow speed forward movement only when operated, a lock changeover switch 38 that can switch the switching actuator 13 to an unlocked state only when operated, and a hold switch 39 that keeps the slow speed forward switch 37 and lock changeover switch 38 in an unoperated state when the worker is not holding the slow speed forward controller 12. [Effects of the Invention]

[0006] In the invention of claim 1, a slow-speed forward controller 12 is provided that moves the machine body forward at a slow speed, and the slow-speed forward controller 12 is positioned away from the control unit 6, and a switching actuator 13 is provided that switches the traveling brake 11 between a locked state and an unlocked state, so that when the traveling brake 11 is in a locked state, operation of the slow-speed forward controller 12 can be accepted, and the switching actuator 13 is activated to switch the traveling brake 11 to an unlocked state, causing the machine body to move forward at a slow speed.Since moving the machine forward at a slow speed by operating the slow-speed forward controller 12 eliminates the need for fine (delicate) operation of levers and the like, the machine can be loaded and unloaded onto a truck and moved through field entrances and exits safely. Since the slow forward speed is fixed, sudden speed increase or decrease due to erroneous operation that may occur when the main speed change lever 14 is manually operated does not occur, ensuring safety of movement and preventing a decrease in workability due to the operator not realizing that the traveling has stopped and work has been interrupted even though the vehicle is not moving forward at a slow speed. In the invention of claim 2, a main speed change lever 14 that controls the forward / reverse output of the machine is provided on the control unit 6, a lever sensor 15 that detects the operating position of the main speed change lever 14 is provided at a predetermined position, a movement sensor 16 that detects the movement of the machine is provided at a predetermined position, and the switching actuator 13 is configured to switch the running brake 11 to a locked state when the brake pedal 17 is depressed continuously for a predetermined time while the lever sensor 15 detects the neutral position of the main speed change lever 14 and the movement sensor 16 is not detecting the movement of the machine, and the slow speed forward controller 12 is provided on the working device 4 on the front side of the machine, and the slow speed forward controller 12 can be operated while away from the machine by pulling out the harness 18 of the slow speed forward controller 12. Therefore, when the brake pedal 17 is depressed for more than a predetermined time while the machine is stopped, the running brake 11 is switched to a locked state, and it is possible to prevent the running brake 11 from being locked when the brake pedal 17 is depressed during work, etc., and to prevent a decrease in work efficiency. The slow forward speed controller 12 is provided on the front side of the machine body and the harness 18 can be pulled out and operated away from the machine body, so that the worker can work while watching the state of the place where the machine is moving, improving the work efficiency, and the worker can work away from the machine body, preventing contact with the machine body. In the invention of claim 3, the slow-speed forward controller 12 is configured so that it will not accept operation unless the harness 18 is pulled out from the mounting position of the working device 4, and the slow-speed forward controller 12 causes slow forward movement when operated and stops slow forward movement when not operated.Therefore, by using the slow-speed forward controller 12 pulled out from the harness reel 19, the worker can work at a position away from the machine body, preventing the worker from coming into contact with the machine body during operation. Since the machine moves forward slowly only while the slow-speed forward controller 12 is being operated, the machine stops when the operation is stopped, so that loading and unloading and movement on slopes can be carried out safely. In the invention of claim 4, a work seat 25 capable of detecting the presence of a worker is provided in the operating section 6, an engine 26 capable of detecting the number of revolutions is mounted, a continuously variable transmission 27 is provided to transmit the driving force of the engine 26 as forward / reverse movement and traveling speed, an auxiliary transmission 28 is provided at a predetermined position to switch the transmission path between the continuously variable transmission 27 and the traveling device 2, a working height sensor 29 is provided at a predetermined position to detect the vertical position of the working device 4, a vehicle height sensor 30 is provided at a predetermined position to detect the vehicle height of the machine body, and the operation of the slow forward controller 12 is performed when the operating position of the main speed change lever 14 is in the "neutral" position and the auxiliary Since the configuration allows it to be accepted when the transmission 28 is in the "travel" position, the seating position of the work seat 25 is "away", the travel brake 11 is "locked", the working height sensor 29 detects "highest", the vehicle height sensor 30 detects "lowest", and the engine 26 rotation speed is "idling", unless the vehicle is stopped and the conditions for proper loading work on the vehicle are met, the slow speed forward controller 12 will not accept any operation, thereby preventing damage to the vehicle during loading work etc. and preventing it from not traveling at a slow speed. In the invention of claim 5, an alarm device 35 is provided which operates before the machine starts moving forward at slow speed, while it is in operation, and when the conditions for moving forward at slow speed are not met, and when moving forward at slow speed, the rotation speed of the engine 26 is increased from "idling" to "minimum driving output", and the output of the continuously variable transmission 27 is increased from the rotation of the neutral position to a set value in proportion to the increase in rotation speed of the engine 26, and when the rotation speed of the engine 26 and the output of the continuously variable transmission 27 reach a state suitable for moving forward at slow speed, the switching actuator 13 is activated to switch the traveling brake 11 to the unlocked state, so that by having the alarm device 35 notify the start of moving forward at slow speed and its operation, it is possible to prevent the operator from noticing the movement of the machine. Furthermore, even if the conditions for slow forward movement are not met, the alarm device 35 operates to make the worker realize that he has forgotten to meet the conditions for slow forward movement, thereby reducing unnecessary time wastage. That is, since the slow forward movement speed is set extremely slow in consideration of the loading operation onto the loading vehicle, etc., the worker may think that the slow forward movement operation has already been performed and end up waiting aimlessly, but this invention prevents this. By increasing the output of the continuously variable transmission 27 in proportion to the increase in the rotation speed of the engine 26, the supply of hydraulic oil for switching the output becomes stable, so that the continuously variable transmission 27 can be prevented from being stopped or damaged due to a load being applied thereto. The traveling brake 11 is unlocked after the rotational speed of the engine 26 and the output of the continuously variable transmission 27 reach a state suitable for slow forward movement, so that the traveling transmission system can be prevented from being damaged by a load imposed on it when traveling with insufficient output. In the invention of claim 6, the slow speed forward controller 12 is provided with a slow speed forward switch 37 that performs slow speed forward movement only when operated, a lock selector switch 38 that can switch the switching actuator 13 to an unlocked state only when operated, and a hold switch 39 that keeps the slow speed forward switch 37 and the lock selector switch 38 in an inoperative state when the operator is not holding the slow speed forward controller 12. By switching the traveling brake 11 between the locked state and the unlocked state by operating the switch, the timing to start and stop slow speed forward movement can be controlled, stabilizing loading and unloading and operations to enter and exit the field. The hold switch 39 keeps each switch in an inoperative state when the operator is not holding the slow speed forward controller 12, preventing the machine from continuing to move in an inoperable state. [Brief explanation of the drawings]

[0007] [Figure 1] Side view of a work vehicle (combine). [Figure 2] Same plan view. [Figure 3] Plan view of the control section. [Figure 4] (A) A schematic side view of the area around the actuator when the pedal is not operated. (B) A schematic side view of the area around the actuator when the pedal is operated. (C) A schematic side view of the area around the actuator when the slow forward switch is operated. [Figure 5] Block diagram. [Figure 6] Side view and operational state diagram of the controller. [Figure 7] 10A and 10B are a side view and an operational state diagram of a controller according to another embodiment; [Figure 8] Side view of the controller. [Figure 9] FIG. 10 is a side view of a controller according to another embodiment. [Figure 10] 10A and 10B are rear and side views of a controller according to another embodiment of the present invention; [Figure 11] FIG. [Figure 12] FIG. 10 is a side view of another embodiment of the work vehicle in a loading / unloading state. [Figure 13] Front view of the Grain Tank. [Figure 14] (A) A side view showing the outer side panel of the grain tank in a closed state. (B) A side view showing the outer side panel of the grain tank in an open state for work. (C) A side view showing the outer side panel of the grain tank in an open state for cleaning. BEST MODE FOR CARRYING OUT THE INVENTION

[0008] An embodiment of the present invention will be explained with reference to the drawings. 1 is a machine frame, 2 is a traveling device that travels in a field and is provided below the machine frame 1, 3 is a threshing device provided above the machine frame 1, a working device 4 that processes crops is provided in front of the traveling device 2, and a grain tank 5 that stores the crops that have been harvested by the working device 4. 6 is a control unit. In explaining the present invention, for ease of understanding, directions such as front / rear, left / right, up / down, etc. will be described based on the direction of travel of the work vehicle, but this does not limit the configuration of the present invention. The traveling device 2 is configured to have a pair of traveling crawlers 10 on the left and right.

[0009] In a work vehicle equipped with a traveling device 2 for traveling in a field, a control unit 6, a work device 4 for performing ground work, and a traveling brake 11 for damping and stopping the transmission of power to the traveling device 2, a slow-speed forward controller 12 is provided for moving the machine body forward at a slow speed, the slow-speed forward controller 12 is located in a position away from the control unit 6, and a switching actuator (solenoid) 13 is provided for switching the traveling brake 11 between a locked state and an unlocked state, so that when the traveling brake 11 is in a locked state, operation of the slow-speed forward controller 12 can be accepted, and the switching actuator 13 is activated to switch the traveling brake 11 to an unlocked state, thereby moving the machine body forward at a slow speed. Although not shown, the traveling brake 11 is provided in a transmission case that transmits rotation to the traveling device 2.

[0010] When the switching actuator 13 is operated, the long-hole stay 44A is pulled, causing the brake arm 42 to rotate. At this time, in the figure, the brake shaft 45 rotates in the counterclockwise direction, the same as the rotation direction of the brake arm 42, and the plates (not shown) of the multi-plate brake (not shown) provided in the transmission case (not shown) are pushed in a direction in which the plates come into contact with each other, and these frictional forces suppress the rotation of the axle caused by the driving force, thereby applying braking. By operating the slow-speed forward controller 12 to move the machine forward at a slow speed, delicate (subtle) operations of levers (main shift levers) and the like are no longer necessary, so the machine can be safely loaded and unloaded onto a truck and moved through field entrances and exits (sloping ground such as ridges). Since the slow forward speed is determined by a preset setting, sudden speed increase or decrease due to an erroneous operation that can occur when the main speed change lever is manually operated does not occur, ensuring safety of movement and preventing a decrease in workability due to the operator not realizing that the traveling has stopped and work has been interrupted even though the machine is not moving slowly forward.

[0011] A main speed change lever 14 that controls the forward and backward movement output of the machine is provided on the control unit 6, a lever sensor 15 that detects the operating position of the main speed change lever 14 is provided at a predetermined position, a movement sensor (vehicle speed sensor) 16 that detects the movement of the machine (vehicle speed) is provided at a predetermined position, and the switching actuator 13 is configured to switch the traveling brake 11 to a locked state when the brake pedal 17 is depressed continuously for a predetermined time (e.g., 3 to 5 seconds) when the lever sensor 15 detects the neutral position of the main speed change lever 14 and the movement sensor 16 is not detecting movement of the machine (=0 km / h), and the slow speed forward controller 12 is provided on the working device 4 on the front side of the machine, and the slow speed forward controller 12 can be operated while away from the machine by pulling out a harness (cable) 18 of the slow speed forward controller 12. In this case, the amount of depression of the brake pedal 17 is detected, for example, by a switch that reacts when the brake pedal 17 is depressed to a position greater than a predetermined amount, or by a potentiometer that detects the amount of depression of the brake pedal 17 in angle.

[0012] In the case of a switch, the determination is made based on whether the contact time exceeds a certain time, and in the case of a potentiometer, the determination is made based on whether an angle equal to or greater than a predetermined value is detected continuously for a certain time. The harness 18 is wound around a harness reel 19 provided at a predetermined position on the working device 4 so as to be freely withdrawable. Reference numeral 20 denotes a storage section for the slow forward speed controller 12, which is stored when slow forward speed operation is not being performed. When the brake pedal 17 is depressed for a predetermined time or longer while the machine is stopped, the traveling brake 11 switches to a locked state, so that when the brake pedal 17 is depressed during work, the traveling brake 11 is locked (deactivated), preventing the machine from stopping and reducing work efficiency.

[0013] The slow forward speed controller 12 is provided on the front side of the machine body and the harness 18 can be pulled out and operated away from the machine body, so that the worker can work while watching the state of the place where the machine is moving, improving the work efficiency, and the worker can work away from the machine body, preventing contact with the machine body. The slow-speed forward controller 12 is configured not to accept operation unless the harness 18 is pulled out from the mounting position of the working device 4, and the slow-speed forward controller 12 moves the machine body forward at a slow speed when operated, and stops the machine body from moving forward at a slow speed when not operated. In other words, the slow forward controller 12 is configured to not accept operation unless the harness 18 is pulled out from the harness reel 19 of the working device 4, and the pulling out of the harness 18 is detected by a detection unit (controller-mounted sensor) 21 provided on the harness reel 19 (Figure 5).

[0014] By using the slow-speed forward controller 12 by pulling it out from the harness reel 19, the operator can work at a position away from the machine body, thereby preventing the operator from coming into contact with the machine body during operation. Since the machine moves forward at a slow speed only while the slow-speed forward controller 12 is being operated, the machine stops when the operation is stopped, so that loading and unloading and movement on slopes can be carried out safely. The control section 6 is provided with a work seat 25 that can detect when a worker is on board, the engine 26 is equipped with an engine that can detect its rotation speed, a continuously variable transmission 27 is provided that transmits the driving force of the engine 26 as forward / reverse movement and traveling speed, an auxiliary transmission 28 is provided in a predetermined position that switches the transmission path between the continuously variable transmission 27 and the traveling device 2, a work height sensor 29 that detects the up and down position of the work device 4 is provided in a predetermined position, a vehicle height sensor 30 that detects the vehicle height of the machine is provided in a predetermined position, and the slow forward controller 12 can be operated when the operating position of the main speed change lever 14 is in the "neutral" position, the auxiliary transmission 28 is in the "travel" position (a state in which only traveling transmission is performed), the seating position of the work seat 25 is "away", the traveling brake 11 is "locked", the work height sensor 29 detects the "highest", the vehicle height sensor 30 detects the "lowest", and the rotation speed of the engine 26 is "idling (approximately 1400 rpm)".

[0015] The boarding of a worker is detected by a detection unit 22 provided in the work seat 25. The configuration of the detection unit 22 is arbitrary, and as an example, a load sensor 22A that detects the load received from the operator may be provided inside the work seat 25, or a distance sensor that determines whether or not a worker is seated by changes in the detection distance may be provided (FIG. 5). When the vehicle is stopped and conditions for proper loading work on the vehicle are not met, the slow-speed forward controller 12 does not accept any operation, thereby preventing the vehicle from being damaged or not traveling at a slow speed during loading work, etc.

[0016] The machine is provided with an alarm device (buzzer, lamp) 35 that operates before the start of slow forward movement, while it is in operation, and when the conditions for slow forward movement are not met, and when slow forward movement begins, the rotation speed of the engine 26 is increased from "idling (1400 rpm)" to "minimum driving output (1700 rpm)", and the output of the continuously variable transmission 27 is increased from the rotation of the neutral position to a set value in proportion to the increase in rotation speed of the engine 26, and when the rotation speed of the engine 26 and the output of the continuously variable transmission 27 reach a state suitable for slow forward movement, the switching actuator 13 is activated and the traveling brake 11 is switched to the unlocked state. By using the alarm device 35 to notify the start and operation of slow forward movement, it is possible to prevent the operator from noticing the movement of the machine body. Furthermore, even if the conditions for slow forward movement are not met, the alarm device 35 operates, making the worker aware that he has forgotten to meet the conditions for slow forward movement, thereby reducing unnecessary time wastage.

[0017] In other words, since the slow forward movement is performed at an extremely slow speed in consideration of operations such as loading onto a loading vehicle, the worker may assume that the slow forward movement has already been performed and wait aimlessly, but this invention prevents this from happening. By increasing the output of the continuously variable transmission 27 in proportion to the increase in the rotation speed of the engine 26, the supply of hydraulic oil for switching the output becomes stable, so that the continuously variable transmission 27 can be prevented from being stopped or damaged due to a load being applied thereto. By unlocking the traveling brake 11 after the rotational speed of the engine 26 and the output of the continuously variable transmission 27 become suitable for slow forward movement, it is possible to prevent damage caused by a load being applied to the traveling transmission system when traveling with insufficient output.

[0018] The slow-speed forward controller 12 is provided with a slow-speed forward switch 37 that causes slow-speed forward movement only while it is being operated, and an alarm device 35 that operates before the machine starts slow-speed forward movement, while it is in operation, and when the conditions for slow-speed forward movement are not met to notify this fact, and at the start of slow-speed forward movement, the engine speed is increased to the "minimum driving output (1700 rpm)" and the output of the continuously variable transmission 27 is increased to a set value, and when the rotation speed of the engine 26 and the output of the continuously variable transmission 27 become suitable for slow-speed forward movement, the switching actuator 13 is activated and the traveling brake 11 is switched to an unlocked state, and if the conditions are met, a lock selector switch 38 that can switch the switching actuator 13 to an unlocked state only while it is being operated, and a hold switch 39 (enable switch) that sets the slow-speed forward switch 37 and lock selector switch 38 to an inoperative state when the operator is not holding the slow-speed forward controller 12.

[0019] By switching the traveling brake 11 between locked and unlocked states with a switch, the timing to start and stop slow forward movement can be controlled, facilitating stable loading and unloading and operations to enter and exit the field. The hold switch 39 can detect when the operator is not holding the slow forward controller 12 and therefore prevents the machine from continuing to move when the operator is unable to operate it. Pressing the slow-speed forward switch 37 of the slow-speed forward controller 12 sets the output of the engine 26 and the continuously variable transmission 27 to an extremely slow speed (for example, 0.72 km / h = 0.2 m / s). Because delicate operation of the main speed change lever 14 is required, the traveling speed may be faster than the operator expects, and the amount of operation may be too small to allow the vehicle to move forward. However, by operating the slow-speed forward controller 12 and using the control of the control unit 40, extremely slow traveling can be achieved. This allows for safe driving during loading operations and when entering and exiting fields.

[0020] Under predetermined conditions, the slow forward speed controller 12 is configured as a momentary switch, and the slow forward speed controller 12 is configured to perform slow forward speed only while each switch is pressed. Therefore, when the switch of the slow forward speed controller 12 is released, the vehicle stops moving, and therefore, when stopping is necessary, the vehicle can be stopped immediately, thereby improving safety. By requiring the operator to operate the machine, unintended movement can be avoided. Examples of conditions for operating the slow forward controller 12 include the main speed change lever 14 being in "neutral" (stopped state), the sub-speed change device (sub-speed change lever) 28 being in "driving" (state in which the reaping and threshing devices are not operating), the operator being "away" from the work seat 25 (state in which operation is performed from outside the machine using a remote control or the like), the brake pedal 17 being "locked (parked state)" (stopped state), the work device 4 being "highest" (state in which it does not come into contact with the platform or cargo bed), the vehicle height of the machine being "lowest" (state in which it is being loaded), and the engine 26 being "idling" (state in which sudden acceleration is not possible).

[0021] Therefore, the slow-speed forward controller 12 does not accept any operation unless the vehicle is stopped and the conditions for proper loading work are met, thereby preventing damage to the vehicle during loading work, etc., and preventing the vehicle from not traveling at a slow speed. The brake pedal 17 is locked by driving the switching actuator 13 . An advancing / retracting rod 43 of a switching actuator 13 such as a solenoid is connected to a rod stay 43A at one end of the brake arm 42, and an advancing / retracting rod 44 of a brake pedal 17 is connected to a rod stay 44A at the other end of the brake arm 42. The middle part of the brake arm 42 is fixed to an operating shaft 45 of the traveling brake 11 (FIG. 4). When the brake pedal 17 is depressed as usual, the sliding part of the switching actuator 13 slides as the brake arm 42 rotates, and the traveling brake 11 is actuated in accordance with the amount of depression of the brake pedal 17.

[0022] On the other hand, when the slow forward speed switch 37 of the slow forward speed controller 12 is pressed, the advancing / retreating rod 43 is retracted by the switching actuator 13, causing the brake arm 42 to rotate to the set position and applying the traveling brake 11 without the operator having to depress the brake pedal 17. Therefore, when an operator gets on the machine body, he does not need to step on the brake pedal 17, which prevents forgetting to apply the brake pedal 17 or releasing it by mistake. Furthermore, even if the worker does not get on the machine, the brake pedal 17 can be remotely depressed, so that the worker can remotely operate the machine from a distance during loading work, improving work safety. In this case, the brake lock is activated by depressing the brake pedal 17 for several seconds with the main shift lever 14 in the "neutral" position, where the vehicle speed is 0 km / h.

[0023] When the vehicle speed sensor 30 and the lever sensor 15 (potentiometer) of the main shift lever 14 are in the above-mentioned state, the switching actuator 13 is operated by the operator depressing the brake pedal 17 for a certain period of time. The worker may then dismount from the machine. Therefore, even if the brake pedal 17 is depressed during loading and unloading work, the switching actuator 13 will not operate, so that it is possible to prevent work from being interrupted by a sudden stop due to an erroneous operation. The slow-speed forward controller 12 (slow-speed forward switch 37) is installed near the driver's seat, and the switch and the device are connected and wired with a harness 18. Therefore, since it is assumed that the slow forward speed controller 12 will be used when the operator has dismounted from the machine, safety is improved by being able to operate it from outside the machine (allowing the operator to escape from the machine in an emergency).

[0024] The installation position of the slow-speed forward controller 12 (slow-speed forward switch 37) is on the back side (rear side) of the working device 4, and the slow-speed forward controller 12 and the main device are connected and wired with a harness 18. That is, the installation position of the slow speed forward controller 12 (slow speed forward switch 37) is the storage section 20 provided on the back side (rear side) of the working device 4, and the slow speed forward controller 12 is connected via the harness 18. Therefore, by operating it from the very front of the aircraft, it is easy to operate while checking the position of Ayumi 48. The harness 18 connecting the slow forward speed controller 12 and the machine body (main machine) is variable in retraction and retraction (automatic retraction and retraction) by an automatic retraction type take-up reel 49. Therefore, when the slow-speed forward controller 12 is not in use, the slow-speed forward controller 12 can be prevented from hanging down and being caught in the drive unit and cut off.

[0025] The remaining 2 m of the harness 18 in the storage section 20 on the machine side is colored or colored tape or the like is wrapped around that portion to make it possible to visually identify the position where problems such as breakage may occur if the harness is pulled out any further. This prevents the harness 18 from being broken due to excessive pulling out. The remaining 30 cm of the harness 18 on the machine side must be fixed to the machine side and cannot be pulled out. This prevents the harness 18 from being broken due to excessive pulling out. When the slow forward speed controller (slow forward speed switch 37) 12 is installed in a predetermined position, that is, in the mounting position (storage section 20), it is disabled for operation even under operable conditions. This prevents erroneous operation when conditions for slow forward movement are met, such as during maintenance.

[0026] In addition, since the device cannot be operated unless the operator is a certain distance away from the machine, it becomes easier for the operator to evacuate in the unlikely event that the machine falls. The slow forward controller (slow forward switch 37) 12 is removed from the aircraft (storage section 20), and the slow forward switch 37 is pressed. After a predetermined time (approximately 2 seconds) has elapsed, the alarm device 35, indicating that the aircraft is about to take off, will sound two intermittent sounds. Therefore, it is possible to confirm whether or not the control by the slow forward speed controller 12 is being accepted, and also to prevent unintentional starting. After the alarm device 35 sounds, the rotation speed of the engine 26 is increased from idling to 1700 rpm. Therefore, since the vehicle cannot run at idling speed (below 1400 rpm), by increasing the engine speed to the minimum required for running, it is possible to prevent the running transmission system from being damaged by torque loss due to ground resistance, etc.

[0027] In this case, the opening of the HST trunnion shaft (not shown) of the continuously variable transmission 27 is gradually increased from idling rotation, and when it reaches a set position, the switching actuator 13 of the brake pedal 17 is activated to release the brake lock. Therefore, by increasing the HST opening degree after the rotational speed of the engine 26 increases, the supply of hydraulic oil to the HST can be stabilized, and the output of the HST can be increased stably. If the rotational speed of the engine 26 does not increase, the supply of hydraulic oil will be unstable, the increase in output will be unstable, and the output will increase rapidly, which may cause the aircraft to take off suddenly. In addition, the increase in output will be unbalanced and unstable, which may cause the aircraft to shake when taking off, and may worsen the operating environment. When the HST opening reaches the set position, the switching actuator 13 is activated to release the brake lock, eliminating the need for a switch or the like for operating the switching actuator 13.

[0028] When the slow forward speed switch 37 of the slow forward speed controller 12 is released, the switching actuator 13 of the traveling brake 11 is driven, and the traveling brake 11 is activated. Therefore, when you want to stop the vehicle, you can do so immediately by simply releasing your finger from the slow forward speed switch 37. Also, by stopping the vehicle using the traveling brake 11, there is no need to wait for the engine 26 rotation speed to increase or the HST output to increase before resuming driving. During slow forward movement by operating the switch of the slow forward movement controller 12, sounds are emitted intermittently from the machine body (for example, a backup buzzer in an automobile). During slow forward movement by operating the slow forward movement switch 37 of the slow forward movement controller 12, the machine combination lamps 51 provided at predetermined positions on the machine are turned on as hazard lights (intermittently lit) to call attention.

[0029] During slow forward movement, the speed is so slow that it may not be recognized as moving. Therefore, by indicating that the machine is moving forward at a slow speed by lighting up the machine combination lamp 51, it can be visually recognized by those around the machine, improving the effect of attracting attention. While the machine is being operated by the slow forward speed switch 37 of the slow forward speed controller 12, the working device 4 of the machine is not driven. Since the operating conditions for slow forward travel by the slow forward controller 12 include the "travel" operation of the sub-transmission device 28, transmission to the working device 4 is cut off, but there is a possibility that it may be unintentionally activated if there is a condition in which abnormalities in the operation of the electrical system may occur due to deterioration over time. For this reason, safety is ensured by setting the state in which power is not transmitted, such as by cutting off the transmission clutch (not shown) to the working device 4. While the machine is being operated using the slow forward speed switch 37, the threshing device 3 of the machine is not driven.

[0030] If the threshing device 3 is activated while traveling at extremely low speed, the engine 26 may not have enough rotational speed, resulting in insufficient driving force and making it impossible to move forward. Therefore, by reliably maintaining the transmission clutch in the disengaged state, the transmission of drive force to the threshing device 3 is cut off, allowing loading work and the like to be carried out reliably. A camera 52 is provided in front of the machine body, and the camera 52 does not detect that the operator is in front of the machine body, that is, the operation of the slow forward speed switch 37 is not accepted unless the operator works standing within the range of the angle of view of the camera 52. Therefore, the operator cannot perform the slow forward loading operation unless he is in a position where he can visually check the vehicle to be loaded from the front or close to the front, such as the bed of a transport vehicle, thereby preventing the vehicle from falling off Ayumi 48 or an entrance / exit and being damaged. As described above, when the loading / unloading operation conditions are insufficient, the slow forward speed switch 37 is not activated even if operated.

[0031] Even if the slow forward speed switch 37 is operated when the loading and unloading conditions are insufficient, the machine will not move and the alarm device (buzzer, etc.) 35 will sound intermittently. By operating the alarm device 35, it is possible to notify the operator that the conditions for slow forward movement are not met, thereby reducing unnecessary time wastage. When the slow forward switch 37 is operated when the loading and unloading conditions are insufficient and control is performed to prevent the aircraft from moving, the panel monitor 53 installed in a predetermined position such as the pilot's seat or a remote control terminal will display the insufficient conditions, i.e., what operation should be performed to travel at an extremely slow speed. This allows the operator to easily grasp the conditions for insufficient slow-speed forward operation, reducing the amount of confirmation work required.

[0032] The slow speed forward controller (slow speed forward switch 37) 12 is provided with a parking brake release switch 55. By making the parking brake release switch 55 a separate switch from the slow forward speed switch 37, the timing of starting to move forward at slow forward speed can be adjusted, making it easier for the operator to operate it from a safe position. When the machine is stopped on the platform 48 when loading or unloading the machine onto a transport vehicle, the parking brake release switch 55 is pressed to move the machine by its own weight to the bottom of the platform 48. By releasing the travel brake 11 on a slope, the weight of the aircraft can be used to move down the slope, thereby saving fuel. The parking brake release switch 55 is also a momentary switch, and operates the switching actuator 13 of the brake pedal 17 only while it is pressed, thereby releasing the lock. Therefore, when it is necessary to stop the vehicle by the running brake 11, the running brake 11 can be reliably activated.

[0033] Each operating switch of the slow-speed forward controller 12 is a so-called enable switch, and the slow-speed forward controller 12 is configured to be turned on when the operator grips the grip portion 57 of the slow-speed forward controller 12, enabling operation of other switches of the slow-speed forward controller 12, and when the operator releases the grip portion 57, all other switches become inoperable. Therefore, unless the grip portion 57 of the slow-speed forward controller 12 is gripped tightly, operation of each switch of the slow-speed forward controller 12 will not be accepted, making it easy to prevent unintentional operation. While the switches are pressed with the grip portion 57 of the slow speed forward controller 12 being gripped, the slow speed forward switch 37 and the parking brake release switch 55 can be operated. Therefore, the slow forward speed switch 37 and the parking brake release switch 55 can be operated with one hand, improving operability. An outer side plate 60 that can be rotated toward the outside of the aircraft body is provided on the outer side surface of the grain tank 5.

[0034] When traveling on the road, the outer side plates 60 are set in a vertical position to narrow the width of the machine body, and when entering a field, the outer side plates 60 are rotated outward. Therefore, when traveling on the road, the width of the machine body can be narrowed to allow safe travel, and when working in a field, the outer side panel 60 can be rotated outward to increase the volume of the grain tank 5 and reduce the amount of grain discharge work, thereby improving work efficiency. A pivot shaft 61 for the outer side plate 60 is provided at the bottom of the grain tank 5, and when a lock 62 is released, the outer side plate 60 pivots forward around the pivot shaft 61. Therefore, the outer side plate 60 is reliably maintained in a rotated state by the lock 62, thereby expanding the volume of the grain tank 5. In addition, the outer side plate 60 is prevented from opening too far and causing grain to leak out, thereby preventing loss of harvested grain.

[0035] The grain tank 5 may have a rotation fulcrum on the upper side of the tank, and when the lock is released, the outer surface may protrude forward. The outer side plate 60 is configured such that, when rotated about a rotation fulcrum shaft 61 by approximately 45° as viewed from the front, the rotation is restricted by a lock 62 . Therefore, the outer side plate 60 can efficiently increase the capacity of the grain tank 5 with a simple operation, and the outer side plate 60 can be securely held by the lock 62, preventing grains from leaking out. When the lock 62 is unlocked (in other words, unlocked) at the 45° rotation position, the outer side plate 60 rotates 90° around the rotation fulcrum shaft 61 and opens to a horizontal position.

[0036] When the outer side plate 60 is placed in a horizontal position, i.e., opened by 90°, an opening 63 is formed on the outer surface of the grain tank 5, making it easier to clean the inside of the grain tank 5. In other words, the outer side plate 60 also serves as a closing member for the opening 63 on the outer surface of the grain tank 5. A limit switch 65 is provided to detect when the outer side plate 60 is opened by 90 degrees, and when the limit switch 65 detects that the outer side plate 60 is opened by 90 degrees, a message to that effect is displayed on the monitor 53 of the control unit 6. Therefore, it is easy to confirm that the outer side plate 60 is open by 90 degrees, and it is possible to prevent the aircraft from moving with the outer side plate 60 in the open state and colliding with an obstacle and being damaged. The outer side panel 60 can be opened by 45° by operating a switch (side panel opening / closing switch) 66 in the cockpit (cabin) 6 (FIG. 3).

[0037] Therefore, by pressing the switch 66 when the operator has finished mowing the perimeter of the field, the operator can open the outer side panels 60 by 45 degrees without getting off the machine, thereby improving work efficiency. Furthermore, if the switch 66 can be operated in multiple stages and can be opened not only 45 degrees but also 90 degrees from the operating unit 6, it will be possible to open the outer side panel 60 without spending a lot of time when manually discharging grains during maintenance work or when the discharge conveying path is malfunctioning. Multiple storage volume sensors 68 are installed vertically inside the grain tank 5 (Figure 14), and when the storage volume inside the grain tank 5 reaches the fourth lowest level of the storage volume sensors 68, a notification is sent to the monitor 53, and the operator operates the switch 66 on the control unit 6 to open part of the grain tank 5 using the outer side panel 60.

[0038] In this embodiment, the outer side panel 60 is not opened when there are no grains stored in the grain tank 5, but rather can be opened at will when the operator deems it necessary once the storage capacity exceeds a certain amount, so that the outer side panel 60 is not operated when it is not necessary (for example, when there is little unharvested straw in the field being worked on and there is no need to expand the capacity). When there are few grains in the grain tank 5, it is often moved to a position close to the outside of the field, and if the outer side panel 60 is open from the beginning, there is a possibility that the outer side panel 60 may come into contact with and be damaged when moving to the next harvesting position or when approaching a wall at the edge of the field or something outside the field (such as a utility pole) due to an operating error, etc., and this is prevented.

[0039] When the grain tank 5 is completely discharged, the outer side plate 60 is automatically closed. The configuration for automatically closing the outer side plate 60 is arbitrary, but as an example, by operating the switch 66, the motor 71 rotates the reel 74 forward and backward, pulling or loosening the wire 72, thereby rotating the outer side plate 60 by 45° (or 90°), and this motor 71 forms an opening / closing actuator 73 (Figures 5 and 15). When the opening / closing actuator 73 is used, the posture can be maintained by stopping the opening / closing actuator 73, so the lock 62 is not necessary. Therefore, collisions can be prevented by keeping the door closed as much as possible while working.

[0040] The outer side plates 60 are closed as much as possible from the start of harvesting work until a certain amount of grains have been stored, that is, when work is performed near the periphery close to the edge of the field, and the outer side plates 60 are opened when work has progressed to a certain extent and the amount of stored grains has increased (when the storage volume sensor 68 in the fourth row from the bottom enters a detection state. This makes it less likely that the outer side plates 60 will come into contact with the walls at the edge of the field, even when they are open. Reference numeral 75 denotes an upper cover, and 76 denotes a bellows member. The upper cover 75 is flexible and covers the upper portions of the front and rear bellows members 76 . The top cover 75 covers the top of the front and rear bellows members 76 and seals the grain tank. When closing the outer side panel 60, the worker is notified once and the outer side panel 60 is closed only after approval is obtained. In this case, the method of notifying the worker is arbitrary, but as one example, when the worker operates a stop switch (not shown) to stop the discharge work, a message is displayed on the monitor 53.

[0041] Therefore, safety can be ensured. In other words, if there is another worker outside the aircraft monitoring the inside of the grain tank 5, closing the outer side panel 60 immediately after stopping the discharge work could result in the worker being pinched or coming into contact with the rotating outer side panel 60 depending on his or her standing position.However, by having the worker at the control unit 6 perform the closing operation, it is possible to confirm that there are no other workers within the rotation range before closing, allowing for safe work to be carried out. During the closing operation of the outer side plate 60, the alarm device (buzzer) 35 sounds while the outer side plate 60 is being closed. Therefore, safety is ensured. The outer side plate 60 is closed at a very slow speed. Therefore, even if there is a worker nearby when the door is closed, there is enough time for the worker to evacuate, ensuring safety. Also, the impact when the outer side plate 60 comes into contact with the grain tank 5 can be almost eliminated, preventing damage to the outer side plate 60 and the grain tank 5. [Explanation of symbols]

[0042] 1...machine frame, 2...traveling device, 3...sorting device, 4...ground work device, 5...grain tank, 11...traveling brake, 12...slow forward controller, 13...switching actuator, 14...main speed change lever, 15...lever sensor, 16...movement sensor, 17...brake pedal, 18...harness, 19...harness reel, 20...storage section, 26...engine, 27...continuously variable transmission, 28...sub-transmission, 29...working height sensor, 30...vehicle height sensor, 30A...vehicle speed sensor, 3 5...alarm device, 37...slow forward switch, 38...lock switch, 39...holding switch, 40...control unit, 42...brake arm, 43...advance / retract rod, 44...advance / retract rod, 45...operating shaft, 48...ayumi, 51...combination lamp, 52...camera, 53...panel monitor, 55...parking brake release switch, 57...grip, 60...outer side panel, 61...rotational fulcrum shaft, 62...lock, 63...opening, 65...limit switch, 66...switch, 68...storage volume sensor.

Claims

1. A work vehicle equipped with a traveling device (2) for traveling in a field, a control unit (6), a work device (4) for performing ground work, and a traveling brake (11) for attenuating and stopping power transmission to the traveling device (2), the work vehicle is provided with a slow-speed forward controller (12) for moving the vehicle forward at a slow speed, the slow-speed forward controller (12) is located at a position away from the control unit (6), and a switching actuator (13) is provided for switching the traveling brake (11) between a locked state and an unlocked state, so that when the traveling brake (11) is in a locked state, operation of the slow-speed forward controller (12) can be accepted, and the switching actuator (13) is activated to switch the traveling brake (11) to an unlocked state, thereby moving the vehicle forward at a slow speed.

2. 2. The work vehicle according to claim 1, wherein a main speed change lever (14) for controlling the forward / reverse output of the machine is provided in the control section (6), a lever sensor (15) for detecting the operating position of the main speed change lever (14) is provided in a predetermined position, a movement sensor (16) for detecting movement of the machine is provided in a predetermined position, the switching actuator (13) is configured to switch the traveling brake (11) to a locked state when the brake pedal (17) is depressed continuously for a predetermined time when the lever sensor (15) detects the neutral position of the main speed change lever (14) and the movement sensor (16) is not detecting movement of the machine, and the slow speed forward controller (12) is provided in a working device (4) on the front side of the machine, and the slow speed forward controller (12) can be operated while separated from the machine by pulling out a harness (18) of the slow speed forward controller (12).

3. 3. The work vehicle according to claim 2, wherein the slow-speed forward controller (12) is configured not to accept operation unless the harness (18) is pulled out from the attachment position of the working device (4), and the slow-speed forward controller (12) causes slow forward movement when operated, and stops slow forward movement when not operated.

4. A working seat 25 capable of detecting the presence of a worker is provided in the control section (6), an engine (26) capable of detecting the number of revolutions is mounted, a continuously variable transmission (27) is provided for transmitting the driving force of the engine (26) as forward / reverse movement and traveling speed, an auxiliary transmission (28) is provided at a predetermined position for switching the transmission path between the continuously variable transmission (27) and the traveling device (2), a working height sensor (29) is provided at a predetermined position for detecting the vertical position of the working device (4), a vehicle height sensor (30) is provided at a predetermined position for detecting the vehicle height of the machine body, and 4. The work vehicle according to claim 2 or 3, characterized in that the operation of the forward speed controller (12) can be accepted when the operating position of the main speed change lever (14) is in the "neutral" position, the auxiliary speed change device (28) is in the "travel" position, the seating position of the work seat 25 is "away", the travel brake (11) is "locked", the working height sensor (29) detects the "highest", the vehicle height sensor (30) detects the "lowest", and the engine (26) rotation speed is "idling".

5. 5. A work vehicle according to claim 4, characterized in that the vehicle is provided with an alarm device (35) that operates before the start of slow forward movement, while the vehicle is operating, and when the conditions for slow forward movement are not met, and is configured to increase the rotation speed of the engine (26) from "idling" to "minimum driving output" at the start of slow forward movement, and increase the output of the continuously variable transmission (27) from rotation in the neutral position to a set value in proportion to the increase in rotation speed of the engine (26), and when the rotation speed of the engine (26) and the output of the continuously variable transmission (27) reach a state suitable for slow forward movement, the switching actuator (13) operates to switch the traveling brake (11) to an unlocked state.

6. 6. The work vehicle according to claim 5, wherein the slow-speed forward movement controller (12) is provided with a slow-speed forward movement switch (37) that causes slow-speed forward movement only when the controller is operated, a lock changeover switch (38) that can switch the changeover actuator (13) to an unlocked state only when the controller is operated, and a hold switch (39) that puts the slow-speed forward movement switch (37) and the lock changeover switch (38) into an unoperated state when the worker is not holding the slow-speed forward movement controller (12).

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