Work vehicles

Abstract

To provide a work vehicle in which a roof is provided above a driving section on which a driver rides, a stay for attaching a positioning device is erected at a height reaching above the roof in front of the driving section, and a positioning device is provided above the roof, and which is characterized in that the positioning device is stably attached with a simple configuration, so as to overcome the problem of conventional work vehicles, in which since positioning accuracy of the positioning device is reduced when the positioning device swings due to vibration during traveling, rigidity is required to suppress the vibration, which may unfavorably increase weight of components and / or hinder a view field.SOLUTION: In a work vehicle: a safety frame 29 for securing a space for a driver when the vehicle falls down is provided behind a driver's seat 8 on which the driver sits; a roof 30 is provided above the safety frame 29; a stay 50 for attaching a positioning device 40 is attached to the safety frame 29; the stay 50 is formed in a shape detouring behind the roof 30; and the positioning device 40 is separated from the roof 30 and fixed above the roof 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a work vehicle for agricultural, civil engineering, construction, or other uses. [Background technology]

[0002] A known work vehicle has a roof above the driver's section where the driver sits, a positioning device stay erected in front of the driver's section for attaching a positioning device, the positioning device stay being configured to a height that reaches above the roof, and a positioning device being mounted above the roof (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-094964 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the positioning device shakes due to vibrations while driving, the positioning accuracy will decrease. Therefore, if the positioning device is installed at the end of a long stay that reaches above the roof, rigidity is required to suppress vibrations, which creates problems such as making the component heavy and obstructing visibility.

[0005] The present invention takes into consideration the problems with conventional work vehicles and has as its object to provide a work vehicle in which a positioning device is stably mounted with a simple configuration. [Means for solving the problem]

[0006] The first aspect of the present invention is In a work vehicle having a safety frame (29) behind a driver's seat (8) where the driver sits, for ensuring space for the driver in the event of a rollover, and a roof (30) above the safety frame (29), a stay (50) for attaching a positioning device (40) is attached to the safety frame (29), the stay (50) is shaped to bypass the rear of the roof (30), and the positioning device (40) is fixed above the roof (30) at a distance from the roof (30); The stay (50) is fixed to the rear surface of the safety frame (29), and has a lower frame (51) extending rearward so as to bypass the rear end of the roof (30), and an upper frame (52) shaped to bypass the roof (30) and wrap around from the rear to the top, and the upper frame (52) is configured so that it can be attached and detached from the top of the lower frame (51) with the roof (30) attached. The second aspect of the present invention is This is a first work vehicle of the present invention, characterized in that it is provided with an obstacle sensor (80) in front of the roof (30) that detects obstacles that exist in a range at least above the roof (30) and below the upper end of the positioning device (40), and is provided with a control device (20) that notifies the driver by an alarm device when the obstacle sensor (80) detects an obstacle. According to the present invention, the roof 30 is made of thin materials to allow rainwater to easily flow away and to be lightweight so as not to raise the vehicle's center of gravity. Therefore, if the positioning device 40 is fixed to the roof 30, it will be susceptible to vibration. The safety frame 29 is made of highly rigid materials that will not deform even when the weight of the vehicle is applied in the event of a rollover. Therefore, by fixing the positioning device 40 to the safety frame 29, it can be positioned in a way that is less susceptible to vibration. Furthermore, the roof 30 can be attached from above with the lower frame 51 attached to the safety frame 29, and the upper frame 52 can be attached from above with the roof 30 attached, allowing for easy assembly. First invention related to the present invention is a work vehicle in which a safety frame 29 is provided behind the driver's seat 8 in order to ensure space for the driver in the event of a rollover, and a roof 30 is provided above the safety frame 29, and a stay 50 for attaching a positioning device 40 is attached to the safety frame 29, and the stay 50 is shaped to bypass the rear of the roof 30, and the positioning device 40 is fixed above the roof 30 at a distance from the roof 30.

[0007] First invention related to the present invention According to the document, the roof 30 is made of thin materials in order to be shaped to allow rainwater to easily run off and to have a lightweight structure to prevent the vehicle's center of gravity from becoming too high. Therefore, if the positioning device 40 is fixed to the roof 30, it will be more susceptible to vibration. The safety frame 29 is made of highly rigid materials so that it will not deform even when the weight of the vehicle is applied when the vehicle rolls over, so by fixing the positioning device 40 to the safety frame 29, it can be positioned in a way that is less susceptible to vibration.

[0008] Furthermore, since the roof 30 is configured to cover the safety frame 29 from above, the positioning device 40 can be installed above the roof 30 by bypassing it from the rear and separating it from the roof 30, thereby enabling the positioning device 40 to be installed with good reception and suppressed vibration.

[0009] Second invention related to the present invention The stay 50 is fixed to the rear surface of the safety frame 29 and has a lower frame 51 extending rearward so as to bypass the rear end of the roof 30 and an upper frame 52 shaped to bypass the roof 30 and wrap around from the rear to the upper side, and the upper frame 52 is configured so as to be detachable from the upper side to the lower frame 51 with the roof 30 attached. First invention related to the present invention It is a work vehicle.

[0010] According to the second invention related to the present invention, the first invention related to the present invention In addition to the above-mentioned effects, the roof 30 can be attached from above with the lower frame 51 attached to the safety frame 29, and the upper frame 52 can be attached from above with the roof 30 attached, thereby facilitating assembly.

[0011] The third invention related to the present invention The vehicle is provided with an obstacle sensor 80 in front of the roof 30 that detects obstacles present in a range at least above the roof 30 and below the upper end of the positioning device 40, and a control device 20 that notifies the driver by an alarm device when the obstacle sensor 80 detects an obstacle. First invention related to the present invention It is a work vehicle.

[0012] According to the third invention related to the present invention, the first invention related to the present invention In addition to the above-mentioned effect, it is possible to prevent the positioning device 40 from coming into contact with an obstacle and being damaged. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a side view of a tractor according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] This is a statutory representation of an embodiment of the present invention. [Figure 8] This is a statutory representation of an embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of a main part showing another embodiment of the present invention. [Figure 10] FIG. 10 is a rear view of the main part showing the other embodiment. [Figure 11] FIG. 10 is a left side view of a main part showing another embodiment of the present invention. [Figure 12] FIG. 10 is a right side view of the main part showing another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] As an embodiment of the present invention, an agricultural tractor, which is a type of work vehicle, will be described. However, the present invention is not limited to the embodiment described below.

[0015] As shown in Fig. 1, the tractor 1 is an agricultural tractor that travels by itself to perform work in a field, etc. A driver (also called an operator) rides in the tractor 1 and performs a predetermined task while traveling in the field.

[0016] In the following description, the front-rear direction of the tractor 1 refers to the straight-ahead direction of the tractor 1. The forward direction of the tractor 1 refers to the direction from the driver's seat 8 to the steering wheel 9 in the straight-ahead direction of the tractor 1, and the opposite direction is the backward (reverse) direction. The front-rear direction of the tractor 1 is based on the forward direction.

[0017] The left-right direction is a direction that is horizontally perpendicular to the front-rear direction. Here, left and right are defined with respect to the "front" side of the front-rear direction. That is, when the driver is seated in the driver's seat 8 and facing forward, the left-hand side is the "left" and the right-hand side is the "right." Furthermore, the up-down direction is a direction that is perpendicular to the front-rear direction and the left-right direction. Therefore, the front-rear direction, the left-right direction, and the up-down direction are perpendicular to each other in three dimensions.

[0018] As shown in Fig. 1, the tractor 1 includes a traveling vehicle body 2. A working machine (not shown) can be connected to the rear of the tractor 1.

[0019] The traveling vehicle body 2 includes a body frame 3, front wheels 4, rear wheels 5, a bonnet 6, a steering section 7, and a transmission case 10. The body frame 3 is the main frame of the traveling vehicle body 2.

[0020] The front wheels 4 are a pair of left and right wheels, located at the front of the traveling body 2, and rotatably connected to the axle. The rear wheels 5 are a pair of left and right drive wheels, located at the rear of the traveling body 2, and rotatably connected to the axle. Note that the front wheels 4 may also be drive wheels to form a four-wheel drive (4WD) vehicle.

[0021] The upper part of the rear wheel 5 is covered with a fender 22, and a grip 28 that can be held by an operator (driver) when getting on or off the vehicle is provided at the rear of the fender 22. A PTO switch (not shown) is also provided below the grip 28 on the fender 22, and operating this PTO switch can switch the on / off operation of a PTO clutch (not shown).

[0022] The hood 6 is provided at the front of the traveling vehicle body 2 so as to be able to be opened and closed freely. The hood 6 can be rotated (opened and closed) in the vertical direction with the rear part as the rotation center. When closed, the hood 6 covers the engine mounted on the vehicle body frame 3. The engine is the driving source of the tractor 1 and is a heat engine such as a diesel engine or a gasoline engine.

[0023] The control unit 7 is provided on top of the traveling vehicle body 2 and includes a driver's seat 8, a steering wheel 9, and a floor step 11. The control unit 7 of the tractor 1 according to this embodiment has a safety frame 29 at the rear, and a roof 30 that covers the driver's seat 8 is provided at the upper end of the safety frame 29.

[0024] The driver sits in the driver's seat 8. The driver can steer the front wheels 4 by operating the steering wheel 9. The operation unit 7 includes a meter panel 100 in front of the steering wheel 9 that displays various information.

[0025] Further, below the driver's seat 8, a motor driver, a main harness, an interface unit, a control device 20 such as a straight-line controller unit, wiring, and the like are housed.

[0026] The floor step 11 is a horizontal member on which the driver places his / her feet, and is located below the steering unit 7. The floor step 11 is fixed to the transmission case 10 via a shock absorber (mount rubber).

[0027] The control unit 7 also includes various operation pedals, such as a brake pedal, accelerator pedal, and clutch pedal (not shown), as well as various operation levers, such as a forward / reverse lever, accelerator lever, main shift lever, and sub shift lever. When the driver depresses the brake pedal, the braking device is activated, enabling braking operation to stop the rotation of the front wheels 4 and rear wheels 5.

[0028] The transmission case 10 is located below the driver's seat 8 and houses a transmission (speed change device). The transmission appropriately reduces the speed of the power (rotational power) transmitted from the engine and transmits it to the rear wheels 5 and the PTO shaft.

[0029] A work implement that performs work in the field is connected to the rear of the traveling body 2, and a PTO shaft that transmits power to drive the work implement protrudes rearward from the transmission case 10. The PTO shaft transmits rotational power that has been appropriately reduced by the transmission to the work implement attached to at least the rear of the traveling body 2. The work implement is a ground work implement that performs work in the field, and various work implements such as a rotary tiller can be connected interchangeably.

[0030] Additionally, a lifting device 31 that raises and lowers the work equipment is provided at the rear of the traveling vehicle body 2. The lifting device 31 raises the work equipment to move it to a non-working position. Additionally, the lifting device 31 lowers the work equipment to move it to a ground work position. The lifting device 31 includes a hydraulic lifting cylinder, a lift arm, a lift rod, a lower link, and a top link.

[0031] 1 to 6, the safety frame 29 is a rigid, strong, gate-shaped frame in rear view with its base fixed to the machine body, and is a ROPS (rollover protection device) that protects the driver in the event of a rollover of the tractor 1. A roof 30 that covers the area above the driver's seat 8 is provided at the upper end of the safety frame 29.

[0032] The tractor 1 also includes a positioning device 40 that measures the position information of the traveling body 2, and a stay 50 that supports the positioning device 40. The positioning device 40 is, for example, a GNSS, and can measure position and time by receiving radio waves from navigation satellites orbiting in the sky.

[0033] The stay 50 is composed of a lower frame 51 whose base is fixed with a bolt 60 to an attachment hole 70 provided in the horizontal frame portion 29a at the top of the safety frame 29, and an upper frame 52 whose base is fixed with a bolt 61 to the rear end of the lower frame 51.

[0034] The lower frame 51 is composed of a mounting plate 51a, left and right lower support pipes 51b whose bases are welded to the left and right ends of the mounting plate 51a, and a lower joining plate 51c which connects the rear ends of the left and right lower support pipes 51b.

[0035] The mounting plate 51a has mounting holes 71, and bolts 60 are inserted through the mounting holes 71 and mounting holes 70 formed in the horizontal frame portion 29a at the top of the safety frame 29, so that the stay 50 is fixed to the rear surface of the horizontal frame portion 29a at the top of the safety frame 29.

[0036] The left and right lower support pipes 51b extend diagonally downward and rearward from bases welded to both left and right ends of the mounting plate 51a, and further extend horizontally rearward.

[0037] Therefore, the lower connecting plate 51c that connects the rear end portions of the left and right lower support pipes 51b that extend rearward is positioned lower than the horizontal frame portion 29a at the top of the safety frame 29.

[0038] The upper frame 52 is composed of an upper connecting plate 52a, L-shaped left and right upper support pipes 52b whose bases are welded to both left and right ends of the upper connecting plate 52a, and mounting seats 52c that connect the front ends of the left and right upper support pipes 52b.

[0039] The upper joining plate 52a abuts against the lower joining plate 51c of the lower frame 51 from above and is fixed with bolts 61, and the upper frame 52 abuts against the lower frame 51 from above and is fixed with bolts 61.

[0040] The left and right upper support pipes 52b extend vertically upward from their bases welded to both left and right ends of the upper connecting plate 52a to a position higher than the top surface of the roof 30, and then extend horizontally forward to a position above the roof 30.

[0041] Therefore, the mounting seat 52c that connects the front ends of the left and right upper support pipes 52b is provided horizontally above the roof 30, and the positioning device 40 is fixed to the mounting seat 52c.

[0042] In summary, a stay 50 for attaching the positioning device 40 is attached to the safety frame 29, and the stay 50 is shaped to bypass the rear of the roof 30, and the positioning device 40 is fixed at a position above the roof 30 and spaced apart from the roof 30.

[0043] The roof 30 is made of thin materials to allow rainwater to easily flow away and to be lightweight so as not to raise the vehicle's center of gravity. Therefore, if the positioning device 40 is fixed to the roof 30, it will be more susceptible to vibration. The safety frame 29 is made of highly rigid materials so that it will not deform even when the weight of the vehicle is applied when the vehicle rolls over, so by fixing the positioning device 40 to the safety frame 29, it can be positioned in a way that is less susceptible to vibration.

[0044] Furthermore, since the roof 30 is configured to cover the safety frame 29 from above, the positioning device 40 can be installed above the roof 30 by bypassing it from the rear and separating it from the roof 30, thereby enabling the positioning device 40 to be installed with good reception and suppressed vibration.

[0045] Furthermore, the stay 50 is fixed to the rear surface of the safety frame 29 and has a lower frame 51 that extends rearward to bypass the rear end of the roof 30, and an upper frame 52 that has a shape that bypasses the roof 30 and wraps around from the rear to the top, and the upper frame 52 is configured so that it can be attached and detached from the lower frame 51 from above with the roof 30 attached.

[0046] Therefore, the roof 30 can be attached from above with the lower frame 51 attached to the safety frame 29, and the upper frame 52 can be attached from above with the roof 30 attached, making assembly easy.

[0047] An obstacle sensor 80 is provided on the upper surface of the front end of the roof 30 to detect obstacles present at least in the range above the roof 30 and below the upper end of the positioning device 40 .

[0048] When the obstacle sensor 80 detects an obstacle, the control device 20 sounds an alarm buzzer provided on the meter panel 100, issues a voice alarm saying "There is an obstacle ahead of the positioning device, and if you continue on this path you will hit it", or notifies the driver by an alarm device that displays an alarm message on a monitor.

[0049] Therefore, if there is an obstacle ahead of the positioning device 40, the obstacle sensor 80 detects the obstacle and the control device 20 notifies the driver via the notification device, thereby preventing the obstacle from coming into contact with the positioning device 40 and damaging it.

[0050] On the other hand, to enable the tractor 1 to be towed on public roads (roads), the upper part of a display plate 90 is fixed with bolts to the rear surface of the horizontal frame portion 29a at the top of the safety frame 29, and the legally required markings shown in Fig. 7 are attached to the display plate 90 so that they can be seen from behind the vehicle. The markings attached to the display plate 90 are positioned high enough to be seen from behind even when the work equipment attached to the rear of the tractor 1 is raised.

[0051] Additionally, the upper part of a second display plate 91 is fixed with bolts to the center of the left and right of the lower end of the display plate 90, and the legally required markings shown in Figure 8 are attached to the second display plate 91 so that they can be seen from the rear of the machine. The markings attached to the second display plate 91 are positioned high enough to be seen from the rear even when the implement attached to the rear of the tractor 1 is raised.

[0052] The left and right vertical frame portions 29b of the safety frame 29 are equipped with left and right turn signal lamps and a brake lamp 55, and the right vertical frame portion 29b is equipped with a backup light 56.

[0053] The wiring (electrical wires) for the left and right turn signal lamps, the brake lamps 55, and the back-up lamps 56 are passed through holes provided in the left and right vertical frame portions 29b of the safety frame 29 and into the left and right vertical frame portions 29b.

[0054] Therefore, since the left and right turn signal lamps, brake lamps 55 and reversing lamps 56 are provided on the left and right vertical frame portions 29b of the safety frame 29 and mounted at a high position, the left and right turn signal lamps, brake lamps 55 or reversing lamps 56 can be seen from behind the machine body or can properly illuminate the rear even when the work equipment mounted on the rear of the tractor 1 is raised.

[0055] <Other embodiments> (1) FIGS. 9 to 12 show another embodiment in which the tractor 1 is provided with only a safety frame 29 without a roof 30.

[0056] That is, the front end of a mounting seat 52c is attached with a bolt 62 to the center of the left and right of the rear surface of the horizontal frame portion 29a at the top of the safety frame 29, and the positioning device 40 is attached to the mounting seat 52c.

[0057] Then, the upper parts of the left and right L-shaped stays 55' are fixed to the left and right parts of the rear surface of the horizontal frame part 29a at the top of the safety frame 29 with bolts 63, and the left and right parts of the display plate 90 are fixed to the lower parts of the left and right L-shaped stays 55' with bolts 64. A legally required marking shown in Figure 7 is attached to the display plate 90 so that it can be seen from the rear of the aircraft.

[0058] The display plate 90 is hung downward from the horizontal frame portion 29a at the top of the safety frame 29 by left and right L-shaped stays 55', so it is positioned lower than the positioning device 40, the positioning device 40 does not get in the way, and visibility from the rear of the aircraft is good.

[0059] The markings attached to the display plate 90 are positioned high enough to be visible from behind even when the implement attached to the rear of the tractor 1 is raised.

[0060] Nuts are then welded to the left and right central portions of the lower end of the display plate 90, the upper portion of the second display plate 91 is fixed with bolts 65, and the display shown in Figure 8, which is required by law, is attached to the second display plate 91 so that it can be seen from the rear of the machine. The display attached to the second display plate 91 is positioned high enough to be seen from the rear even when the work implement attached to the rear of the tractor 1 is raised. [Explanation of symbols]

[0061] 8 Driver's seat 20 Control device 29 Safety Frame 30 Roof 40 Positioning device 50 Stay 51 Lower frame 52 Upper frame 80 Obstacle Sensor

Claims

1. In a work vehicle having a safety frame (29) behind a driver's seat (8) where the driver sits to ensure space for the driver in the event of a rollover, and a roof (30) above the safety frame (29), a stay (50) for attaching a positioning device (40) is attached to the safety frame (29), and the stay (50) is shaped to bypass the rear of the roof (30), and the positioning device (40) is fixed above the roof (30) at a distance from the roof (30), The stay (50) is fixed to the rear surface of the safety frame (29), and has a lower frame (51) extending rearward so as to bypass the rear end of the roof (30), and an upper frame (52) shaped to bypass the roof (30) so as to wrap around from the rear to the upper side, and the upper frame (52) is configured so as to be detachable from above to the lower frame (51) with the roof (30) attached.

2. 2. The work vehicle according to claim 1, further comprising an obstacle sensor (80) in front of the roof (30) for detecting obstacles present in a range at least above the roof (30) and below the upper end of the positioning device (40), and a control device (20) for notifying the driver by an alarm device when the obstacle sensor (80) detects an obstacle.

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