JP2024070087A - Work vehicle - Google Patents

Abstract

To provide a work vehicle which prevents a spraying boom from coming into contact with a washer tank, and which can protect equipment and which can improve visibility.SOLUTION: A work vehicle includes: a travelling vehicle body (A) in which a cabin (K) is provided; and a pair of left and right spraying booms (b1) which is provided by being separated to left and right side parts of the travelling vehicle body (A), and which can change between an action posture projecting to the lateral outside of the travelling vehicle body (A), and a stored posture positioned in a state of extending in the frontward/backward direction of the travelling vehicle body (A) by passing the lateral side of the cabin (K) in the frontward/backward direction further on the inside in the lateral width direction of the travelling vehicle body (A) than in the action posture. At the cabin (K), a boom guard (k3) is provided which prevents contact between the cabin (K) and the spraying boom (b1). Between the boom guard (k3) and the cabin (K), a washer tank (k2) is provided.SELECTED DRAWING: Figure 1

Description

This invention relates to a work vehicle that works in farm fields.

A work vehicle is known that is equipped with a cabin for the worker to ride in, a spray boom for spraying pesticides, and a boom receiver for supporting the spray boom when stored (Patent Document 1).

Patent No. 6401569

In the conventional configuration, the sides of the cabin were made up of door glass and side glass, and visibility was poor due to frames between the glass, etc.

The technical objective of this invention is to improve the visibility of the operator and to improve the maintainability of the aircraft.

The above problems of the present invention are solved by the following solutions:

The invention described in claim 1 is a work vehicle comprising a traveling body (A) equipped with a cabin (K), a pair of left and right spray booms (b1) that are provided on the left and right sides of the traveling body (A) and can be changed between an operating position in which the boom protrudes outward from the side of the traveling body (A) and a stored position in which the boom passes in the fore-and-aft direction of the lateral sides of the cabin (K) and extends in the fore-and-aft direction of the traveling body (A) on the inner side in the width direction of the traveling body (A) than the operating position, and the cabin (K) is provided with a boom guard (k3) that prevents contact between the cabin (K) and the spray boom (b1), and a washer tank (k2) is provided between the boom guard (k3) and the cabin (K).

The invention described in claim 2 is the work vehicle described in claim 1, characterized in that the washer tank (k2) is provided with a cover portion (g1) that covers the washer tank (k2) and a flexible cover (g2) that covers the side portion from above.

The invention described in claim 3 is the work vehicle described in claim 2, characterized in that the boom guard (k3) is provided on both the left and right sides, the washer tank (k2) is provided inside the left boom guard (k3), and a work light (k8) is provided inside the right boom guard (k3).

According to the invention described in claim 1, contact between the cabin K and the spray boom b1 is prevented, and even if a washer tank k2 is provided near the cabin K, the spray boom b1 is prevented from contacting the washer tank k2, making it possible to protect equipment and improve visibility.

According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, by covering the washer tank k2, damage and deterioration of the washer tank k2 can be prevented, and since the cover g2 is made of a flexible material, maintenance can be easily performed.

According to the invention described in claim 3, in addition to the effects of the invention described in claim 2, the electrical components are placed inside the boom guard k3, which makes it possible to protect the electrical components and improve visibility, and the work light k8 can be easily adjusted even if the worker remains in the cabin K.

FIG. 1 is a perspective view showing an example of the configuration of a drug spraying vehicle according to an embodiment of the present invention. FIG. 2 is a side view of the drug dispersal vehicle shown in FIG. FIG. 3 is a plan view of the drug spraying vehicle shown in FIG. FIG. 4 is a front view of the drug spraying vehicle shown in FIG. FIG. 5 is a side view of a cabin of a pesticide spraying vehicle according to an embodiment of the present invention. FIG. 6 is a perspective view of a cabin of a pesticide spraying vehicle according to an embodiment of the present invention. FIG. 7 is a rear view of the cabin of a pesticide spraying vehicle according to an embodiment of the present invention. FIG. 8 is a perspective view of the periphery of the washer tank according to the present invention. FIG. 9 is a view showing the vicinity of the PTO lever according to the embodiment of the present invention. FIG. 10 is a view showing the vicinity of the PTO lever according to the embodiment of the present invention. FIG. 11 is a diagram of a transmission case according to an embodiment of the present invention. FIG. 12 is an enlarged view of the transmission case according to the embodiment of the present invention. FIG. 13 is a diagram of an HST according to an embodiment of the present invention. FIG. 14 is an enlarged view of a main portion of the HST according to the embodiment of the present invention. FIG. 15 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 16 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 17 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 18 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 19 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 20 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 21 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 22 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 23 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 24 is a hydraulic circuit diagram according to an embodiment of the present invention. FIG. 25 is a hydraulic circuit diagram according to an embodiment of the present invention.

The following describes in detail the form (embodiment) for carrying out the present invention with reference to the drawings.

The present invention is not limited to the contents described in the following embodiments. Furthermore, the components described below include those that a person skilled in the art can easily imagine and those that are substantially the same. Furthermore, the configurations described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the configurations can be made without departing from the spirit of the present invention.

Figure 1 is a side view showing an example of the configuration of a drug spraying vehicle according to an embodiment of the present invention.

Figure 2 is a plan view (partially omitted) of the pesticide spraying vehicle shown in Figure 1.

The pesticide spraying vehicle 1, which is an example of a work vehicle according to this embodiment, is a work vehicle in which an operator, such as a worker, rides on the traveling vehicle body A and drives the vehicle to spray pesticides on a field. As shown in Figures 1 and 2, the pesticide spraying vehicle 1 is composed of the traveling vehicle body A, a cabin K, a pesticide tank M, and a spraying boom b1 for spraying the pesticide supplied from the pesticide tank M on the field. In this embodiment, the traveling direction of the pesticide spraying vehicle 1 is a direction along the front-rear direction of the traveling vehicle body A, and is a direction from the driver's seat a2 toward the steering wheel a3 when the pesticide spraying vehicle 1 is traveling straight. In addition, the vehicle width direction or left-right direction of the traveling vehicle body A is a direction horizontally perpendicular to the traveling direction. In addition, the up-down direction of the traveling vehicle body A is a direction vertically perpendicular to the traveling direction.

The traveling vehicle body A includes a main frame a1, a driver's seat a2, a steering wheel a3, and front wheels a4 and rear wheels a5 as examples of wheels. The main frame a1 is formed to extend from the front to the rear of the traveling vehicle body A.

A bonnet a7 is located at the front of the traveling vehicle body A, and an engine E is installed inside the bonnet a7. A driver's seat a2 is located behind the bonnet a7. The driver's seat a2 is a seat where the operator sits when driving and operating the pesticide spraying vehicle 1. Control units for controlling operations such as opening and closing the spraying boom b1 and spraying pesticides are located at appropriate positions around the driver's seat a2. The steering handle a3 is turned by the operator to steer at least the left and right front wheels a4 or the rear wheels a5, thereby changing the direction of travel of the pesticide spraying vehicle 1. The front wheels a4 are steered by at least turning the steering handle a3.

The cabin K encloses the driver's seat a2 and the steering wheel a3 to form the passenger compartment. The cabin K is located between the chemical tank M and the spray boom b1.

The spraying boom b1 sprays the pesticide on the front side of the pesticide spraying vehicle 1. As shown in Figures 1 to 4, the spraying boom b1 is provided on the front side of the traveling vehicle body A. The spraying boom b1 includes a center boom b1F and side booms b1L, b1R on either side. The center boom b1F is disposed on the front side of the pesticide spraying vehicle 1 and extends horizontally in the vehicle width direction of the traveling vehicle body A. The center boom b1F has multiple nozzles bn arranged at intervals to spray the pesticide in a mist form.

The support and lifting device b2 is a device that supports the spray boom b1 so that it can be raised and lowered at the front of the traveling vehicle body A. This support and lifting device b2 supports the spray boom b1 and enables it to be raised and lowered and rolled, and also serves the function of providing the driving force for each of the operations of deployment, storage, and up and down movement.

This support lifting device b2 is equipped with a lifting link b20, a lifting frame b21, and a rolling support frame b22, and these mechanisms enable the lifting and rolling operations of the spraying boom b1.

The lifting link b20 rotates its front end up and down in response to the extension and contraction of the lifting cylinder Cy1 to raise and lower the lifting frame b21. The extension and contraction of the lifting cylinder Cy1 is controlled by the control device C, and the height position of the entire spray boom b1 can be changed up and down depending on the amount of control. In addition, the operation of the accumulator U described below also serves to absorb and dampen vertical vibrations.

As shown in FIG. 4, the lifting frame b21 has a rectangular frame shape when viewed from the front, has a rolling axis Y at the bottom center, and is configured to pivotally support the rolling support frame b22 so that it can roll freely around the rolling axis Y.

The rolling support frame b22 is configured to roll in response to the expansion and contraction of the rolling cylinder Cy2. The expansion and contraction of the rolling cylinder Cy2 is controlled by the control device C, and the rolling direction and rolling amount can be controlled by the control amount.

The rolling support frame b22 supports the spray boom b1, with a center boom b1F disposed in front of it, and side booms b1L, b1R disposed on both the left and right sides of the lifting frame b23. This allows the spray boom b1 to roll together with the rolling support frame b22.

The side booms b1L, b1R are configured to rotate their tips (free ends) inward or outward in the vehicle width direction when the opening/closing cylinders Cy3, Cy3 extend or retract due to a rotation mechanism disposed on both the left and right sides of the rolling support frame b22, and are configured to rotate their tips (free ends) up and down when the up-down cylinders Cy4, Cy4 extend or retract.

With this configuration, the spraying boom b1 is configured to be switchable between a fully deployed position and a fully stowed position. When in the fully deployed position, the pesticide can be sprayed over a wide area in front and to the left and right sides of the pesticide spraying vehicle 1. When in the stowed position, the side booms b1L, b1R can be prevented from coming into contact with external obstacles.

Furthermore, boom receivers a8, a8 for receiving the stored side booms b1L, b1R are provided on the left and right sides of the traveling vehicle body A, and storage detection sensors Sn1, Sn1 are disposed on the left and right boom receivers a8, a8, respectively, which detect whether the side booms b1L, b1R are stored in the boom receivers a8, a8 by detecting contact with the side booms b1L, b1R. Note that the storage detection sensor Sn1 may be any sensor capable of detecting whether the side booms b1L, b1R are stored in the boom receivers a8, a8, and the detection means may be of a non-contact type.

The side booms b1L, b1R are attached to both the left and right sides of the center boom b1F so that they can be switched between a spraying position extending in the vehicle width direction of the traveling body A and a storage position along the left and right sides of the traveling body A. When in the storage position, the side booms b1L, b1R are supported by boom receivers a8 located on both the left and right sides of the rear of the traveling body A. The side booms b1L, b1R are provided with multiple spray nozzles bn spaced apart to spray the pesticide in a mist. The pesticide spraying vehicle 1 is a slide boom with extendable side booms b1L, b1R, and is a vehicle that can spray pesticide over a wide area by extending the length of the side booms b1L, b1R during operation.

The boom receiver a8 has a boom frame portion a8A extending to both the left and right sides, and a boom guard portion a8B disposed at both the left and right ends of the boom frame portion a8A. The boom guard portion a8B supports the undersides of the side booms b1L, b1R, thereby supporting the side booms b1L, b1R.

A boarding/alighting step T1 is located on the side of the cabin K. When the operator (pilot) gets into the cabin K, he/she places his/her foot on the boarding/alighting step T1 to open the door k7.

A carrier k9 is disposed below and behind the chemical tank M. The carrier k9 is supported by the main frame a1 of the traveling vehicle body A. The carrier k9 is configured to be able to carry work materials such as containers (polyethylene tanks) filled with water for cleaning to prevent chemicals from solidifying in the piping after work is completed. The carrier k9 is also configured to allow the operator to stand on the carrier k9 and perform maintenance on the chemical tank M.

In the figure, a boarding and disembarking step T1 is provided on the left side of the machine, but a sub-step T2 used as an auxiliary to the boarding and disembarking step T1 is provided on either the left or right side of the machine. In addition, the cabin K is provided with boom guards k3 on both the left and right sides to prevent the spraying boom b1 from contacting the cabin K.

In a configuration in which the sub-step T2 is provided only on the left side of the machine body, the sub-step T2 is provided inside the left side of the boom guard k3, and on the side of the rear frame k1, a washer tank k2 that stores washer fluid used to wash the glass of the cabin K. With this configuration, the washer tank k2 is located in a position that does not interfere with the spray boom b1, preventing damage, and the operator can easily supply water by standing on the sub-step T2.

In a configuration in which the sub-step T2 is provided only on the right side of the aircraft, the washer tank k2 is provided on the side of the rear frame k1, inside the boom guard k3. The washer tank k2 is provided with a cover part g1 that covers the front, rear, outside and bottom sides with iron plates, and a light-shielding cover g2 is provided on the top and inside. The light-shielding cover g2 is made of a flexible material, and the top and bottom can be rolled up. This configuration prevents deterioration by blocking light and heat from the washer tank k2, while also ensuring maintainability. It also prevents flying objects from colliding with the washer tank k2.

In a configuration in which sub-step T2 is provided only on the left side of the aircraft body, a damper k4 for opening and closing the rear window k6 is provided only on the left side of the cabin K. A washer tank k2 and an antenna k5 for receiving GPS, radio, etc. are located closer to the cabin K than the left boom guard k3, and a work light k8 is located closer to the cabin K than the right boom guard k3. In addition, a turn signal k10, which is a warning device, is attached to the top of the boom guard k3, and the left end of the turn signal k10 is located closer to the cabin K than the left end of the boom guard k3.

With this configuration, the electrical components are distributed inside the boom guard k3, protecting the electrical components and ensuring visibility. In addition, the work light k8 on the right side of the machine is located on the side without the damper k4, making it easy to adjust. From the left side of the machine, water can be easily filled into the washer tank k2 and the antenna can be easily extended and adjusted in angle by stepping onto the sub-step T2.

Inside the cabin K, there is a driver's seat a2 where the operator sits. Under the driver's seat a2, there is a PTO lever P that operates the PTO shaft 32 to change gears. The PTO lever P is connected to the transmission Q via a link mechanism pn, and the PTO is switched by operating the PTO lever P.

The PTO lever P has a handle portion p1 that the pilot grasps when operating the PTO lever P, a rod-shaped lever portion p2, and a connection portion p3 that is attached to the link mechanism pn. The connection portion p3 and the link mechanism pn have mounting holes p4 in the fore-aft direction of the aircraft, and are connected by a fastener p5 such as a bolt. The fastener p5 is fastened from below, and this mounting configuration allows the PTO lever to have some play in the left-right movement. In addition, by providing multiple mounting holes p4 on the link mechanism pn side, the mounting position of the PTO lever P can also be adjusted in the fore-aft direction. Note that the configuration that allows play in the left-right direction may be a conventional method of connecting the PTO lever P and the link mechanism pn from the left-right direction of the aircraft, or a configuration that includes an elastic body such as a spring.

The control device S has a function of storing the position of the PTO lever P and controlling the rotation of the PTO shaft based on the stored position. By operating the PTO lever P, the rotation of the PTO shaft 32 can be switched between a stopped (neutral) state, a low-speed rotation state, and a high-speed rotation state. A PTO lever position detection sensor Sn2 is provided to detect the position of the PTO shaft 32, and the position of the PTO shaft 32 is detected and stored in a memory unit Cm provided in the control device C, and the rotation of the PTO shaft 32 is controlled based on the data stored in the memory unit Cm.

The memory unit Cm has an adjustment mode, which is a function for performing an operation to store the position of the PTO lever P. In the adjustment mode, the PTO lever P is operated after the adjustment mode is started, and if the value of the PTO lever position detection sensor Sn2 is within the normal range, the current position of the PTO lever P is stored in the memory unit Cm as a set value. The stored value may be a stopped state, a low-speed rotation state, or a high-speed rotation state. In addition, the configuration may be such that these settings can be switched, or multiple settings can be stored. Note that if the value of the PTO lever position detection sensor Sn2 is not within the normal range, the current position of the PTO lever P is redetected. Note that a configuration may be provided in which a stopped state switch, a high-speed rotation state switch, and a low-speed rotation state switch are each provided for setting the position adjustment.

The opening and closing door k7 of the cabin may be configured with separate side glass and door glass, or may have no side glass. In a configuration without side glass as in FIG. 5, the door lock lever d1 is positioned near the center of the opening and closing door k7, where it can be reached by an operator seated in the driver's seat a2. A stay d4 for attaching the pivot d2 of the opening and closing door k7 and the striker d3 of the door lock lever d1 is provided on the frame that constitutes the cabin K. This configuration without side glass improves visibility compared to a cabin K with conventional door glass.

Figures 11 and 12 are side views of the transmission case 20 mounted on the work vehicle of this embodiment.

21 is the front case, 23 is the rear case. Furthermore, 24 is the input shaft for the transmission force from the engine, and 29 is the driving output shaft for the front wheels 2. Also, 30 is a hydraulic continuously variable transmission (HST), and 31 is a clutch lubrication hole. Also, 32 is a PTO shaft for a work device such as a boom sprayer, 33 is a live PTO output shaft (additional transmission shaft) described later, and 38 is a driving output shaft that transmits the driving force to drive the rear wheels a5.

The inside of the transmission case 20 has a structure as shown in Figures 11 and 12.

First, the explanation will be centered on the front case 21. The input shaft 24 is held by the input bearing 21a. A gear 40 is connected to the rear end of the input shaft 24. A gear 41 fixed to a clutch drive shaft 42 meshes with the gear 40. The front end of the clutch drive shaft 42 is supported by a clutch front bearing 43 formed in the front case 21. Here, 55 is a clutch.

The gear 41 further meshes with a gear 44 located below it, and this gear 44 is fixed to a gear pump drive shaft 45 that drives the first hydraulic pump, and the gear pump bearing 45a, which is the bearing for this gear pump drive shaft 45, is formed in the front case 21.

On the other hand, above the gear 40, a gear 47 attached to an axle 48 meshes, and the tip of the axle 48 is supported by a bearing 49 formed on the front case 21. Furthermore, the rear end of the axle 48 is supported by a bearing 50a provided on a part of a bearing plate portion 50 attached to the center case 22 side. A gear 51 is attached near the center of the axle 48, and a gear 52 meshes with the gear 51, and the gear 52 is fixed to the live PTO output shaft 33 described above. The front end of the live PTO shaft 33 is supported by a bearing 54 formed on the front case 21, and the rear end is supported by a bearing 50b formed on the bearing plate portion 50, and protrudes rearward to be usable as a live PTO output shaft.

When the driving force of the engine is input from the input shaft 24, the gear 40 rotates. This rotation causes the meshed gear 47 to rotate, which in turn rotates the shaft 48. The rotation of the shaft 48 causes the gear 51 to rotate, which in turn rotates the meshed gear 52.

As a result, the live PTO output shaft 33 fixed to the gear 52 rotates, and the driving force from the engine is output to the outside. This driving force is output from the upstream side (right side) of the clutch 55, so it is not affected by the clutch 55 being on or off, and can be output as long as the engine is running.

Gear 40 also meshes with gear 41, which is fixed to clutch drive shaft 42, so the driving force of the engine is also transmitted from input shaft 24 to clutch drive shaft 42. Clutch drive shaft 42 is connected to clutch 55. Therefore, the driving force transmitted to clutch drive shaft 42 depends on whether clutch 55 is engaged or disengaged.

Furthermore, gear 41 meshes with gear 44, and the driving force of the engine is also transmitted from the input shaft 24 to the gear pump drive shaft 45 to which gear 44 is fixed. The first hydraulic pump is driven by the rotation of this gear pump drive shaft 45. The second hydraulic pump attached to the front case 21 is also driven by a similar mechanism.

Next, the central case 22 and the rear case 23 will be described. The central case 22 is connected to the front case 21 and the rear case 23 by a bolt mechanism, making it removable. As shown in Figures 16 and 17, A indicates the boundary surface between the front case 21 and the central case 22, and B indicates the boundary surface between the central case 22 and the rear case 23. The central case 22 is fixed to the frame of the running body 1 of the work vehicle 1 by a connecting part 53.

Inside the central case 22, the above-mentioned bearing plate portion 50 is formed at the front position, and the clutch bearing plate portion 57 is formed at the central position.

A clutch 55 is disposed between the front bearing plate 50 and the clutch bearing plate 57, and the clutch drive shaft 42 is journaled on the bearing 60 of the clutch bearing plate 57 via the clutch 55. Furthermore, the rear part of the clutch drive shaft 42 passes through a hole 61 in the bearing 60 and is journaled on the clutch drive shaft bearing 62 of the rear case 23.

The HST drive shaft is supported by the rear case 23, so it is either cantilevered by the rear case 23 or fixed to the HST itself.

In addition, since the drive shaft is long from front to rear, it is supported by the front case 21, the center case 22, and the rear case 23.

Furthermore, a speed change gear 70 is fixed to the clutch drive shaft 42, and this speed change gear 70 meshes with a gear 71 attached to the shaft of the work device PTO shaft 32, and the rotation of the clutch drive shaft 42 is transmitted to the PTO shaft 32. Therefore, the rotation of this work device PTO shaft 32 is determined by whether the clutch 55 is engaged or disengaged. 32a is a PTO bearing provided in the rear case 23.

On the other hand, a gear 63 is further attached to the clutch drive shaft 42, and the gear 63 meshes with an HST input gear 64. The HST output gear 65 is connected to the front wheel drive output shaft 29 and the rear wheel drive output shaft 38 via three gear mechanisms 66, 67, and 68. In FIG. 7, 29a is a bearing for the front wheel drive output shaft 29. Therefore, the output changed in speed by the HST 30 is transmitted to the drive output shafts 29 and 38. Here, 30a is the HST input side, and 30b is the HST output side. Also, 72 and 73 are the HST input bearing and the HST output bearing, respectively.

In this way, by dividing the transmission case 20 into front, center, and rear sections and fixing the center case 22 to the frame of the running body 1 of the work vehicle 1 (connection part 53), maintenance work inside the case can be performed without removing the entire transmission case 20 from the vehicle body.

Power from the engine is transmitted to the HST input side part 30a via the HST input gear 64. A spline is connected to a hole provided on the HST input gear 64 side. A spline on the HST output side part 30b is connected to a hole provided on the HST output side part 65 side.

As shown in FIG. 13, in the HST mounted on the work vehicle of this embodiment, the spline portion 74 is made into a hollow shaft 75, and a lubricant is sealed in the hollow shaft 75. The spline portion 74 is provided with a small hole 76 that connects to the hollow shaft 75 in which the lubricant is sealed. The centrifugal force generated by rotation causes the lubricant in the hollow shaft 75 to leak into the spline portion 74, preventing wear on the spline portion 74.

As shown in FIG. 14, the shape of the small holes 76 may be spaced at 2 equal intervals of 180 degrees, 3 equal intervals of 120 degrees, 4 equal intervals of 90 degrees, or some other shape.

The hydraulic system of the work vehicle of this embodiment may be configured as follows. Figures 15 to 25 are circuit diagrams showing an example of a hydraulic circuit of the work vehicle of this embodiment.

The hydraulic circuit in FIG. 15 includes a main cylinder M1 that raises and lowers the lifting mechanism of the spray boom, and a main relief M2 that controls to prevent the hydraulic pressure from rising above a set pressure. In the conventional configuration, there was a risk that the hydraulic lifting force would decrease by the amount of oil passage pressure loss in the lift control valve M3, and that simply raising the main relief pressure would exceed the pump's withstand pressure, resulting in a problem of adequate pressure not being supplied to the main cylinder M1. Therefore, in the present invention, the main relief M2 is disposed near the main cylinder M1, thereby improving the hydraulic lifting force and stabilizing the supply of hydraulic pressure to the main cylinder M1, thereby enabling the spray boom b1 to be driven. In addition, in the conventional configuration, the flow control valve M4 and the main relief M2 were located close to each other, which caused a problem of abnormal noise. However, in this configuration, the distance between the flow control valve M4 and the main relief M2 is increased, which solves the abnormal noise problem.

The hydraulic circuit in Figures 16 and 17 includes a plate portion N4 between the main valve N2 that controls the main cylinder N1 and the horizontal valve N3 that controls the horizontal position of the spray boom. By configuring the plate portion N4 to include a hydraulic path, separate valves can be connected. The plate portion N4 may also be configured to include a non-leak solenoid N5. By providing the non-leak solenoid N5 on the plate portion N4, leakage from the main cylinder N4 can be prevented and the operation of the lifting mechanism of the spray boom b1 can be stabilized, even in a configuration in which separate valves are connected.

Conventionally, the hydraulic circuit was configured so that the T3 port, as shown in Figure 24, merged with the horizontal control flow rate of the work machine horizontal control valve V1 (when the horizontal control was not activated) and the unloaded flow rate of the lift valve V2.

In the hydraulic circuits shown in Figures 20 and 21, the horizontal control flow rate (when horizontal control is not activated) and the lift valve unload flow rate are taken from separate ports. The T3 port is divided into T7 and T8 as shown in Figure 20. The horizontal control flow rate (when horizontal control is not activated) (T7 port) is used as clutch lubricant. Additionally, the lift valve unload flow rate (T8 port) is used as PTO gear lubricant.

The hydraulic circuit shown in Figure 22 is configured so that the control flow CF of the flow control valve is throttled by J1 and J2 to be diverted to the lubrication path for the PTO gears and the lubrication path for the clutch.

The hydraulic circuit shown in FIG. 23 is equipped with a flow control valve V3, and the control flow CF of the flow control valve V3 is divided by the flow control valve V4 into the lubrication path of the PTO gear and the lubrication path of the clutch. In addition, the control flow CF of the flow control valve V4 is supplied to the lubrication path of the PTO gear, and the surplus flow EF is supplied to the lubrication path of the clutch.

In the hydraulic circuit of FIG. 25, an accumulator W3 is placed between the steering switching control valve W1 and the steering cylinder W2. By placing the accumulator W3, it is possible to reduce abnormal noise during steering operation.

In a configuration equipped with a vibration damping device that suppresses vibration of the spray boom b1, an electromagnetic solenoid is used for vibration damping control. After the deployment or storage control of the spray boom b1 is completed, continuous pulse output is performed for a predetermined time to turn on the electromagnetic solenoid. Conventionally, the solenoid was turned off during deployment or storage control and turned on after the control, but this configuration could cause the spray boom b1 to suddenly rise or fall. In the configuration of the present invention, the electromagnetic solenoid is intermittently switched on and off by continuous pulse output and turned on after a certain time has passed, enabling stable vibration damping control and preventing the spray boom b1 from suddenly rising or falling.

The control section inside the cabin K is equipped with a liquid crystal display. The liquid crystal display has a function to display which working machine is currently being used, and displays the working machine's unused state, tilling state, pest control state, etc. A method may also be used in which a sensor is provided in the operating device or the power transmission section to the working machine, and the working state is detected and displayed on the liquid crystal display via the control device. Other data may also be displayed on the liquid crystal display.

A Traveling vehicle body b1 Spraying boom g1 Cover part g2 Cover K Cabin k2 Washer tank k3 Bracket guard k8 Work light

Claims (3)

The vehicle is provided with a traveling body (A) equipped with a cabin (K), and a pair of left and right spraying booms (b1) that are provided on the left and right sides of the traveling body (A) and can be changed between an operating posture in which the booms protrude laterally outward from the traveling body (A) and a stored posture in which the booms pass through the lateral sides of the cabin (K) in the longitudinal direction and extend in the longitudinal direction of the traveling body (A) more inward in the lateral width direction of the traveling body (A) than the operating posture,
The cabin (K) is provided with a boom guard (k3) that prevents contact between the cabin (K) and the spray boom (b1), and a washer tank (k2) is provided between the boom guard (k3) and the cabin (K). The work vehicle according to claim 1, characterized in that the washer tank (k2) is provided with a cover (g1) that covers the washer tank (k2) and a flexible cover (g2) that covers the side portion from above. The work vehicle according to claim 2, characterized in that the boom guards (k3) are provided on the left and right sides, the washer tank (k2) is provided inside the left boom guard (k3), and the work light (k8) is provided inside the right boom guard (k3).