Work vehicles

Abstract

There are tractors with a sun visor mounted above the driver's seat. However, during field work, tractors make many turns and change direction, so the direction of the sun changes each time, and simply blocking the sun from the front is insufficient. Therefore, we provide a work vehicle that can properly block the sun. [Solution] In a work vehicle with a cockpit inside a cabin 7, a roll screen 30 is provided with rail mounting stays that connect to rails 31 located on the front and left and right sides of the upper part inside the cabin 7. A moving device driven by a motor that moves along the rails 31 is provided on the rail mounting stays. Means for acquiring the position of the sun and means for acquiring the orientation of the work vehicle 29 are provided, and the relative position of the sun is calculated from the position of the sun and the orientation of the work vehicle, and the roll screen 30 is moved to a position that blocks sunlight from the worker seated in the cockpit.

Description

Technical Field

[0001] This invention relates to a work vehicle such as an agricultural tractor.

Background Art

[0002] There is a tractor with a sun visor attached to the upper front of the driver's seat (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in field work, the tractor turns many times and changes its traveling direction, so the direction of the sunlight also changes each time, and it was not sufficient to simply block the sunlight in front.

[0005] In view of the above problems, an object of the present invention is to provide a work vehicle that can appropriately block sunlight.

Means for Solving the Problems

[0006] The invention according to claim 1 is a work vehicle provided with a driver's seat 8 in a cabin 7, equipped with a roll screen 30 provided with a rail mounting stay 33 connected to rails 31 arranged on the front side and the left and right sides of the upper part inside the cabin 7, provided with moving devices 33d, 33d driven by a motor 33b that moves along the rail 31 on the rail mounting stay 33, provided with means for acquiring the position of the sun and means 29 for acquiring the orientation of the work vehicle, calculating the relative position of the sun from the position of the sun and the orientation of the work vehicle, and moving the roll screen 30 to a position that blocks sunlight for an operator seated on the driver's seat 8.

[0007] According to the invention described in claim 1, the relative position of the sun is calculated from the position of the sun and the orientation of the work vehicle, and the roll screen 30 is moved to a position that blocks sunlight from the worker seated in the cockpit 8, thereby effectively blocking sunlight.

[0008] The invention described in claim 2 is a work vehicle according to claim 1, which calculates the relative position of the sun using the current position of the work vehicle, the current time, and the orientation of the work vehicle, as determined by the positioning device 15.

[0009] The invention described in claim 3 is a work vehicle having a driver's seat 8 inside a cabin 7, equipped with a roll screen 30 having rail mounting stays 33 connected to rails 31 arranged on the front and left and right sides of the upper part inside the cabin 7, and having moving devices 33d, 33d driven by motors 33b that move along the rails 31 on the rail mounting stays 33, and a work vehicle that moves the roll screen 30 to a position that blocks sunlight from the worker seated in the driver's seat 8 according to the light intensity ratio detected by a plurality of light sensors 37 provided on the upper part of the cabin 7.

[0010] According to the invention described in claim 3, the roll screen 30 is moved to a position that blocks sunlight from the operator seated in the cockpit 8 according to the light intensity ratio detected by a plurality of light sensors 37 provided on the upper part of the cabin 7, so that sunlight can be properly blocked.

[0011] The invention described in claim 4 is a work vehicle according to any one of claims 1 to 3, wherein rails 31 are arranged in a U-shape in plan view on the front and left and right sides of the upper part inside the cabin 7.

[0012] According to the invention described in claim 4, since the rails 31 are arranged in a U-shape in plan view on the front and left and right sides of the upper part inside the cabin 7, the roll screen 30 can be moved forward and to the left and right of the cabin 7 to properly block sunlight. [Brief explanation of the drawing]

[0013] [Figure 1] This is a side view of a tractor according to an embodiment of the present invention. [Figure 2] This is a plan view showing the main parts of the cabin. [Figure 3] This is a perspective view of a roller blind. [Figure 4] This is an end view illustrating the operation of the rail and roller screen. [Figure 5] This is a plan view of a cabin illustrating another embodiment of the present invention. [Modes for carrying out the invention]

[0014] As one embodiment of the present invention, an agricultural tractor 1 equipped with a rotary tiller W, which is a type of work vehicle, will be described.

[0015] As shown in Figure 1, Tractor 1 is an agricultural tractor that performs work in fields and other areas while moving under its own power.

[0016] In the following, the forward and backward directions refer to the direction of travel when the tractor 1 is moving straight, with the front side of the direction of travel defined as "forward" and the rear side as "rear." The direction of travel of the tractor 1 is the direction from the driver's seat 8 (described later) toward the steering wheel 9, which serves as the steering device, when moving straight.

[0017] The left-right direction is the direction perpendicular to the front-back direction. In the following, left and right are defined with respect to the "front" side. That is, with the operator of tractor 1 (also called the "driver") seated in the driver's seat 8 and facing forward, the left side is "left" and the right side is "right".

[0018] The vertical direction refers to the vertical direction. The front-back, left-right, and up-down directions are orthogonal to each other. Note that these directions are defined for the sake of explanation, and the present invention is not limited by these directions. Also, in the following, tractor 1 may be referred to as the machine body or vehicle body.

[0019] As shown in Fig. 1, the tractor 1 includes a traveling vehicle body 2 and a link mechanism L for a working machine provided at the rear thereof. The traveling vehicle body 2 includes a vehicle body frame 3 serving as a main frame, left and right driving front wheels 4 steered by a steering wheel 9, left and right driving rear wheels 5, a bonnet 6, an engine E, a control unit 7a in a cab 7, and a transmission case 10.

[0020] The bonnet 6 is provided at the front part of the traveling vehicle body 2 so as to be openable and closable. The bonnet 6 is rotatable (openable and closable) in the vertical direction at the rear part as a rotation center. The bonnet 6 covers the engine E mounted on the vehicle body frame 3 in a closed state.

[0021] The engine E is a driving source of the tractor 1 and is a heat engine such as a diesel engine or a gasoline engine.

[0022] The control unit 7a is provided in the cab 7 provided at the upper part of the traveling vehicle body 2 and includes a driver's seat 8, a steering wheel 9, etc.

[0023] The driver's seat 8 is a seat for an operator (driver). The steering wheel 9 is operated by the operator when steering the left and right driving front wheels 4.

[0024] The transmission case 10 houses a transmission (speed change mechanism). The transmission case 10 appropriately decelerates the power (rotational power) transmitted from the engine E by the transmission and transmits it to the left and right driving front wheels 4 and left and right driving rear wheels 5 which are driving wheels, and a PTO shaft 45.

[0025] At the rear part of the traveling vehicle body 2, a hydraulic cylinder case 40 is provided at the upper rear part of the transmission case 10, and lift arms 41 constituting a part of a hydraulic lifting mechanism are rotatably attached to both left and right sides of this cylinder case 40. The lift arms 41 move up and down by the telescopic operation of a hydraulic cylinder 40a for lifting.

[0026] Furthermore, a three-point linkage mechanism L consisting of a top link T42 and left and right lower links 43 is provided, and a rotary tiller W is attached to this linkage mechanism L. The lower links 43 are connected to the lift arm 41 via a lift rod 44, thereby enabling the rotary tiller W to be raised and lowered. A PTO shaft 45 that transmits power to drive the rotary tiller W protrudes rearward from the transmission case 10.

[0027] The PTO shaft 45 transmits rotational power, which has been appropriately reduced by the transmission, to the rotary tilling implement W mounted on the rear of the vehicle body 2 via a drive shaft 46 equipped with universal joints at both ends.

[0028] The rotary tiller W is a machine that performs tilling work in a field. The rotary tiller W tills the field surface (soil) by rotating the tilling tines 47 with power transmitted from the PTO shaft 45.

[0029] The front control panel FP at the front of the control unit 7a is equipped with a monitor, which is a notification device that displays various information in front of the steering wheel 9.

[0030] Furthermore, the front control panel FP section is equipped with various control pedals such as the accelerator pedal 11, left and right brake pedals 12L and 12R for braking the left and right rear wheels 5 respectively, and a clutch pedal, as well as various control levers such as the forward / reverse lever, accelerator lever, main transmission lever, sub-transmission lever, and turn signal lever for operating the turn signals.

[0031] Furthermore, a control device 13 is provided in the front control panel FP section, and a GNSS 15, which serves as a positioning device, is mounted on the front upper surface of the roof 14 of the cabin 7.

[0032] The control device 13 controls various parts such as the engine E, the drive system and operating system of the vehicle body 2, and the rotary tilling implement W. It is equipped with a recording unit that records various data such as a calendar database that stores the position of the sun and a map database. The recording unit calculates the work route for the autonomous tractor 1 to perform round-trip operations on the user-owned field F registered in the map database and stores the work route in the map database.

[0033] Tractor 1, in field F, receives signals from positioning satellites via GNSS15, calculates its position using the satellite positioning system, and autonomously drives (automatically operates) along the work route, performing tasks automatically.

[0034] As shown in Figures 1 and 2, the cabin 7 is fixed to the vehicle body via elastic members such as vibration-damping rubber, making it difficult for vibrations from the vehicle body to be transmitted to the cabin 7.

[0035] Cabin 7 has a frame structure that is integrated by a floor 17, front support columns 18 erected on the left and right front of the floor 17, rear support columns 19 erected on the left and right rear of the cockpit 8, intermediate support columns 20 erected in the middle of the front and rear, and an upper frame 21 connecting the upper ends of these support columns, and the upper part is covered by a roof 14 fixed to the upper frame 21.

[0036] Furthermore, the front and rear sides are equipped with a windshield FG and a rear window RG, while the left and right sides are equipped with opening and closing doors 22 and side windows SG.

[0037] The opening and closing door 22 is a glass door with transparency, and has an upper and lower edge. The front side follows the front support column 18, the lower rear side follows the fender 25, and the upper rear side follows the intermediate support column 20. A sealing material is fitted around the perimeter of the tempered glass. Hinges 27 are configured at two locations, upper and lower, between the rear of the opening and closing door 22 and the intermediate support column 20. The hinges 27 are fixed from the outside of the intermediate support column 20 and the opening and closing door 22, allowing the opening and closing door 22 to rotate outward and open the left and right sides of the cabin 7.

[0038] An outer door handle 28 is provided on the lower front outer side of the opening / closing door 22. An inner door handle is also provided on the inner side of the opposing opening / closing door 22.

[0039] An electronic compass 29 is provided on a reinforcing plate 18a connected to the left and right front support pillars 18, which are reinforcing members of the windshield FG, as a means for detecting the direction of the tractor 1.

[0040] Furthermore, a U-shaped rail 31, fixed to the upper frame 21, is installed in the upper part of the cabin 7, and a roll screen 30 is movably mounted on it.

[0041] As shown in Figure 3, the roll screen 30 is a typical type in which a flat light-shielding member that blocks sunlight and the like is rolled up and stored inside the main body 30a. When the lower handle 31 is pulled downwards, the light-shielding member that is rolled up inside the main body 30a is pulled out to the position where the handle was pulled, and when the storage knob 32 on the side is pulled, the pulled-out light-shielding member is rolled up and stored inside the main body 30a.

[0042] On the upper surface of the main body 30a of the roller screen 30, rail mounting stays 33 are provided on the left and right sides, respectively.

[0043] As shown in Figure 4, the rail mounting stay 33 has an electric motor 33b fixed to the upper part of a mounting seat 33a, the base of which is fixed to the upper surface of the main body 30a, and drive wheels (tires) 33d, 33d, which serve as a moving device, are attached to the drive shafts 33c, 33c that protrude from both sides of the electric motor 33b.

[0044] The electric motor 33b operates in forward and reverse directions according to the command of the control device 13, thereby rotating the drive wheels 33d, 33d in forward and reverse directions.

[0045] The rail 31, installed in the upper part of the cabin 7, is made of a curved square pipe material and arranged in a U-shape in plan view along the top of the front windshield FG and the opening doors 22 on both sides and the side windows SG at the front of the cabin 7. A movable through hole 31a for the mounting base 33a of the rail mounting stay 33 for the roll screen 30 is provided along the entire length of the rail on the underside.

[0046] The roller screen 30 is attached to the rail 31 by inserting two rail mounting stays 33 from one end of the rail 31, with the mounting base 33a inserted through the through hole 31a on the underside of the rail 31 and both drive wheels 33d, 33d in contact with the bottom surface 31b inside the rail 31.

[0047] Here, we will explain the control mechanism by which the roller screen 30 moves along the rail 31 to block sunlight from the operator (driver) seated in the cockpit 8.

[0048] When starting work in field F, the worker pulls the handle 31 of the roll screen 30 downwards to pull the light-shielding member to the designated position.

[0049] Then, start engine E and turn on the main switch to activate the control device 13.

[0050] The control device 13 receives signals from positioning satellites using GNSS 15 and calculates the position information and current time of the tractor 1 using the satellite positioning system. The electronic compass 29 detects the orientation of the tractor 1, calculates the position of the sun at the current time from the calendar database in the recording unit, calculates the relative position of the sun to the tractor 1, and operates the electric motor 33b to rotate the drive wheels 33d, 33d until the roll screen 30 is in a position to block sunlight from the worker (driver) seated in the driver's seat 8, moving the roll screen 30 along the rail 31 and stopping.

[0051] Therefore, the roller screen 30 can effectively block sunlight, allowing workers to perform their tasks effectively.

[0052] Furthermore, since the rail 31 is arranged in a U-shape in a plan view along the windshield FG at the front of the cabin 7, the opening doors 22 on both sides, and the top of the side windows SG, the roll screen 30 can be moved forward and to the sides of the cabin 7 to properly block sunlight. Figure 5 shows another embodiment, in which light sensors 37 are provided at the front and on both sides of the cabin 7, and the roll screen 30 is moved according to the ratio of light intensity detected by the three light sensors 37 to appropriately block sunlight from the worker (driver) seated in the cockpit 8.

[0053] Specifically, the three light sensors 37 are located at the left-right center position above the windshield FG on the front side of the roof 14 of the cabin 7, at the top of the side glass SG on the right side of the roof 14, and at the top of the opening / closing door 22 on the left side of the roof 14.

[0054] The control device 13 calculates the ratio of light intensity detected by the three light sensors 37, determines the direction with the most light intensity relative to the cabin 7, and operates the electric motor 33b to rotate the drive wheels 33d, 33d until the roll screen 30 is in a position where it blocks sunlight from the worker (driver) seated in the cockpit 8, moving the roll screen 30 along the rail 31 and stopping.

[0055] Therefore, the roller screen 30 can effectively block sunlight, allowing workers to perform their tasks effectively. [Explanation of symbols]

[0056] 7 cabins 8. Cockpit 15. Positioning device (GNSS) 29. Means for obtaining the orientation of the work vehicle (electronic compass) 30 Roller Blinds 31 rails 33 Rail mounting bracket 33b Motor (Electric Motor) 33d Movable device (drive wheels) 37 Light Sensor

Claims

1. A work vehicle having a cockpit (8) inside a cabin (7), equipped with a roll screen (30) having rail mounting stays (33) connected to rails (31) arranged on the front and left and right sides of the upper part inside the cabin (7), a moving device (33d, 33d) driven by a motor (33b) that moves along the rails (31) provided on the rail mounting stays (33), a means for acquiring the position of the sun and a means for acquiring the orientation of the work vehicle (29), and a work vehicle characterized in that the relative position of the sun is calculated from the position of the sun and the orientation of the work vehicle and the roll screen (30) is moved to a position that blocks sunlight from the worker seated in the cockpit (8).

2. The work vehicle according to claim 1, characterized in that the relative position of the sun is calculated using the current position of the work vehicle, the current time, and the orientation of the work vehicle, as determined by a positioning device (15).

3. A work vehicle having a cockpit (8) inside a cabin (7), equipped with a roll screen (30) having rail mounting stays (33) connected to rails (31) arranged on the front and left and right sides of the upper part inside the cabin (7), a moving device (33d, 33d) driven by a motor (33b) that moves along the rails (31) provided on the rail mounting stays (33), and a work vehicle characterized in that the roll screen (30) is moved to a position that blocks sunlight from the operator seated in the cockpit (8) according to the light intensity ratio detected by a plurality of light sensors (37) provided on the upper part of the cabin (7).

4. A work vehicle according to any one of claims 1 to 3, characterized in that rails (31) are arranged in a U-shape in plan view on the front and left and right sides of the upper part inside the cabin (7).

Images