JP2022170403A - work vehicle - Google Patents

Abstract

To provide a work vehicle in which a work machine is mounted on a rear portion of a travel vehicle body, and which does not travel on a general road without attachment of a low-speed travel vehicle mark by attracting attention by issuing a warning to an operator before travel start when the low-speed travel vehicle mark is not attached to a prescribed position of a travel vehicle body when the vehicle is about to travel on the general road.SOLUTION: A work vehicle in which a low-speed vehicle mark 70 is detachably attached to a rear portion of a travel vehicle body 1 comprises: a pedal sensor 41 which detects step-in of an accelerator pedal 11 that changes the rotation of an engine; and a mark sensor 42 which detects attachment of a low-speed vehicle mark 70. The work vehicle issues a warning when detecting step-in of the pedal sensor 41 without detecting the attachment by the mark sensor 42.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle that is operated by a worker on board.

Work vehicles used for farmland work and civil engineering work can travel on general roads, but because the traveling speed is slower than general vehicles, a low-speed vehicle mark is displayed on the rear of the vehicle body. It is designed to warn the following general vehicles.

For example, the work vehicle described in Japanese Unexamined Patent Publication No. 2017-108687 travels by raising the work equipment attached to the rear part of the vehicle body, but the low-speed running vehicle mark attached to the rear part of the vehicle body cannot be seen from behind. It is devised to inform the worker who operates the work vehicle of this fact.

JP 2017-108687 A

In the above-mentioned conventional work vehicle, even if the low-speed vehicle mark is attached, if the low-speed vehicle mark cannot be seen by the following general vehicle after raising the work equipment, the worker who is steering forward is warned. However, in work areas such as fields, the low-speed vehicle mark is not attached, so the vehicle runs on general roads without the low-speed vehicle mark. Even if something happens, there is no warning and it is dangerous.

The present invention is a working vehicle having a working machine attached to the rear part of the traveling vehicle body, and when traveling on a general road, if a low-speed traveling vehicle mark is not attached to a predetermined position of the traveling vehicle body, the operator is notified before the vehicle starts traveling. The problem is to prevent the vehicle from traveling on a general road without attaching the low-speed vehicle mark by issuing an alarm to call attention to the vehicle.

The above problems of the present invention are solved by the following technical means.

According to the first aspect of the invention, a work vehicle having a detachable low-speed vehicle mark 70 on the rear portion of a traveling vehicle body 1 comprises a pedal sensor 41 for detecting depression of an accelerator pedal 11 that changes the speed of rotation of an engine E, and a low-speed vehicle mark 70. The work vehicle is characterized in that a mark sensor 42 for detecting the mounting is provided, and an alarm is issued when the accelerator pedal 11 is depressed without the mark sensor 42 detecting the mounting.

According to the second aspect of the invention, the control device 100 for controlling the traveling speed is provided with a road traveling mode S1 and a work traveling mode S2, and when the road traveling mode S1 is set, the mark sensor 42 does not detect that the low-speed vehicle mark 70 is mounted, and the accelerator is operated. The work vehicle according to claim 1, wherein an alarm is issued when the pedal 11 is depressed.

In the third aspect of the present invention, a sub-transmission sensor 43 is provided for detecting a shift operation of the sub-transmission lever 16 to a high speed suitable for the road speed, and the mark sensor (42) is activated when the sub-transmission sensor 43 detects a shift. 2. The work vehicle according to claim 1, wherein an alarm is issued if the accelerator pedal 11 is depressed without detecting attachment of the low speed vehicle mark (70).

According to the first aspect of the invention, if the low-speed vehicle mark 70 is not attached to the vehicle body 1 and the accelerator pedal 11 used for traveling on the road is depressed to start traveling, an alarm is issued, and the operator stops traveling. As a result, the low-speed vehicle mark 70 is attached at a predetermined position, so that safe driving on the road becomes possible.

According to the second aspect of the invention, if the controller 100 is set to the road running mode S1 without the low-speed vehicle mark 70 being attached to the vehicle body 1, and if the accelerator pedal 11 is depressed to start running, an alarm will be issued. Since the driver attaches the low-speed vehicle mark 70 to a predetermined position without starting the vehicle, safe driving becomes possible.

In the third aspect of the present invention, the accelerator pedal 11 is stepped on without the mark sensor (42) detecting the installation of the low speed vehicle mark (70) in a state in which the sub shift sensor (43) detects that the sub shift lever (16) has been shifted to high speed. Since an alarm is issued when the driver tries to start running at , the driver attaches the low-speed vehicle mark 70 to a predetermined position without starting running, so that safe running becomes possible.

1 is a left side view of a working vehicle showing an embodiment of the present invention; FIG. It is a right side view of the same work vehicle. FIG. 3 is a detailed view of the lifting cylinder case portion of FIG. 2; FIG. 3 is a block diagram of a control device for the work vehicle; It is a front view of the low-speed vehicle mark in the same work vehicle. It is a partial side view showing an example of attachment of a low-speed vehicle mark to the tractor of the work vehicle. It is a partial rear view showing an example of attachment of the low-speed vehicle mark. It is the back view which attached the low-speed vehicle mark to the tractor of the same work vehicle.

Preferred embodiments of the present invention will be described below with reference to the drawings.

In this specification, the forward direction of the work vehicle in which the driver's seat is provided is called the front side, the backward direction is called the rear side, and the left and right directions in the forward direction are called the left side and the right side, respectively.

FIG. 1 shows a left side view of a tractor equipped with a rotary tillage device as a working machine as an example of a working vehicle, and FIG. 2 shows a right side view of the same. 3 shows a detailed view of the lifting cylinder case portion of FIG. 2, and FIG. 4 shows a block diagram of the control device. The working vehicle may be a working vehicle equipped with a working machine such as a pest control device, a grass clipping device, or the like.

The tractor has an engine E mounted on the front portion of a traveling vehicle body 1 having left and right front wheels 2, 2 and left and right rear wheels 3, 3. The rotational power of the engine E is appropriately reduced by a transmission in a transmission case 4, and these front wheels 2, 2 and rear wheels 3, 3.

A steering handle 6 is supported on a handle post 5 arranged in the center of the traveling vehicle body 1, and a driver's seat 7 is provided behind it. Below the steering handle 6, a forward/reverse lever 8 is provided for switching the traveling direction of the traveling vehicle body 1 to the forward/backward direction. A clutch pedal 9 for adjusting the clutch is provided at the left corner of the step floor 12 on the opposite side of the forward/reverse lever 8 across the handle post 5, and left and right rear wheels are provided at the right corner of the step floor 12. 3, 3 are provided with left and right brake pedals 10L, 10R for operating the brakes, respectively, and an accelerator pedal 11 for accelerating and decelerating the rotation of the engine E. As shown in FIG. The accelerator pedal 11 is mainly used to adjust the traveling speed when traveling on the road, and a pedal sensor 41 detects depression of the accelerator pedal 11 .

A main transmission lever 14 for switching the main transmission (not shown) between neutral, 1st, 2nd and 3rd speeds is located in the front left part of the driver's seat 7, and the subtransmission (not shown) is operated at low speed and low speed. Behind it is an auxiliary transmission lever 16 which can select any of medium speed, high speed and neutral positions, and further behind that is a PTO transmission lever 17 which changes the rotation speed of the rotary tiller between low speed, neutral and high speed. is provided. These transmissions include mechanical mechanisms such as gears and hydraulically driven ones such as hydraulic clutches. When the sub-shift lever 16 is shifted to a high speed suitable for road driving, the sub-shift sensor 43 detects the shift operation.

Further, on the right side thereof, a work rotation setting lever 13 for setting the rotation speed of the engine E to a speed suitable for work, a position lever 18 for setting the height of the working machine 22, and the like are arranged. A safety frame (also referred to as ROPS) 19 is erected behind the driver's seat 7 .

A position lever sensor (such as a potentiometer) 18a (FIG. 4) is provided at the base of the position lever 18 to detect the operating position. The work machine 22 is connected to the rear portion of the traveling vehicle body 1 via a support member 25 fixed to the axle case 23 of the rear wheel 3 and a support arm 27 rotatably connected to the support member 25 . One end of a rotating arm 32 is connected to the tip of the piston rod 30 a of the lifting cylinder 30 , and the other end of the rotating arm 32 is fixed to a rotating arm shaft 33 . One end of a lift arm 50 is also fixed to the rotating arm shaft 33 , and one end of a lift rod 51 is rotatably connected to the other end of the lift arm 50 . Also, the other end of the lift rod 51 is rotatably connected to the support arm 27 .

When the driver operates the position lever 18 forward, the lift side solenoid 40a of the electromagnetic hydraulic valve (elevating solenoid valve) 40 is actuated to extend the elevating cylinder 30 in the elevating cylinder case 35 and rotate the rotating arm 32. By rotating the arm shaft 33 , the lift arm 50 rotates in the direction of arrow A (upward) with the rotating arm shaft 33 as a fulcrum, and the working machine 22 is lifted via the lift rod 51 and the support arm 27 . Similarly, when the driver operates the position lever 18 rearward, the descent solenoid 40b is actuated to contract the elevating cylinder 30 in the elevating cylinder case 35, and the lift arm 50 rotates with the rotating arm shaft 33 as the fulcrum. By rotating in the opposite direction (downward) to the direction, the work implement 22 descends.

In the tractor of this embodiment, a reflecting mirror 36 is erected as a reflecting material at the rear part of the traveling vehicle body 1, and further, below the reflecting mirror 36, a predetermined distance (for example, 1 m) behind the reflecting mirror 36 A shielding object detection sensor 60 is installed to detect the presence or absence of a certain shielding object. Then, when the presence of a shield is detected by the shield detection sensor 60, a warning is issued by notifying that the reflecting mirror 36 is in a shielding state (notification function). The reflecting mirror 36 can be easily installed by attaching it to the rear part of either one of the left and right fenders 37 , 37 .

The shield sensor 60 is a photoelectric sensor, and is turned on/off when the light from the light projecting part 60a hits the detection object 62 and returns to the light receiving part 60b. In addition, an infrared sensor, an ultrasonic sensor, or the like may be used instead of the photoelectric sensor.

When the tractor travels on the road, the work implement 22 is raised. In this case, when the tractor 22 is raised to a height where the reflecting mirror 36 is hidden, the shield sensor 60 is turned on and a sensor signal is input to the controller 100 . A signal is output from the control device 100 to the notification buzzer 65 and the notification lamp 67 on the meter panel 63, so that the notification buzzer 65 sounds and the notification lamp 67 lights. Both the notification buzzer 65 and the notification lamp 67 may be provided, but either one may be provided. In addition, the notification means is not limited to a buzzer or a lamp, and may be an auditory or visual notification means such as a sound, a picture or a character displayed on a panel, or the like. It is also possible to display on the meter panel 63 that the low-speed vehicle mark 70 is set to a predetermined value.

When the tractor travels on the road with the work implement 22 attached, it is dangerous if the reflecting mirror 36 cannot be visually recognized from behind. According to this configuration, when the upper end of the working machine 22 rises to approximately the same height as the reflecting mirror 36 and the shielding object detection sensor 60 detects that the reflecting mirror 36 is in the shielded state, the notification buzzer 65 and the notification lamp are activated. Due to 67, the driver is immediately aware of the blocking condition. In this case, the driver can operate the position lever 18 to lower the work implement 22 or stop traveling to check the position of the work implement 22 . Therefore, it is possible to prevent the vehicle from continuing to travel, and safety is ensured.

Many agricultural work vehicles travel at a slower speed than general automobiles, and especially in the evening and at nighttime, it is easy for automobiles approaching from behind to recognize them. Therefore, when traveling on the road, it is required to attach a low-speed vehicle mark to the rear part of the vehicle body.

A front view of the low-speed vehicle mark 70 is shown in FIG. The low-speed vehicle mark 70 has a substantially triangular shape, and a reflector 70b is installed around a triangular member 70a. The presence of the vehicle is recognized when the reflector plate 70b appears as a triangular outline due to the headlights of the following vehicle.

Then, as shown in FIGS. 1 and 2, by attaching a shielding object sensor 60 to the lower part of the low speed vehicle mark 70, the shielding object sensor 60 is turned on when the work implement 22 rises to a height where the low speed vehicle mark 70 is hidden. Then, the control device 100 sounds the notification buzzer 65 and lights the notification lamp 67 . Therefore, the driver immediately notices that the low-speed vehicle mark 70 is hidden by the working machine 22, so that the driver can be prevented from traveling without noticing it. Therefore, safety is ensured while traveling on the road.

6 and 7 show an embodiment in which the low-speed vehicle mark 70 is attached to the safety frame 19. The mark 70 is stored in the rear part of the driver's seat 7 during agricultural work in the field, and the mark is provided in the middle part of the right arm of the safety frame 19 during driving on the road. The mark sensor 42 provided in the mark mounting portion 44 detects this by inserting it into the mounting portion 44 . When the low-speed vehicle mark 70 is removed, the mark sensor 42 is turned off and does not detect it.

In the automatic control block diagram of FIG. , and when the low-speed vehicle mark 70 is attached to the mark attachment portion 44, the mark sensor 42 is input as an ON signal. Furthermore, setting signals for the road running mode S1 and the work running mode S2 for setting the running modes are input.

From the control device 100, when the mark sensor 42 remains off and the ON signal of the pedal sensor 41 or the sub-transmission sensor 43 or the setting signal of the road running mode S1 is input, when the accelerator pedal 11 is depressed to start running, The information is output to the notification buzzer 65 and the notification lamp 67 . It should be noted that when the foot is released from the clutch pedal 9 and the running is started, the notification buzzer 65 or the notification lamp 67 may be output.

As a result, when the accelerator pedal 11 is depressed, the sub-transmission lever 16 is shifted to the high speed position, or the on-road driving mode S1 is set without the low-speed vehicle mark 70 attached to the mark mounting portion 44, the notification buzzer 65 or notification A lamp 67 is activated to alert the operator of the work vehicle.

After the warning by the notification buzzer 65 and the notification lamp 67, the operator stops the vehicle from starting to run and attaches the low-speed vehicle mark 70 to the mark mounting portion 44, so that the vehicle can start running on the road without any trouble.

The operation positions of the main gear lever 14, the sub-gear lever 16 and the PTO gear lever 17 are determined, and when all are neutral, the work implement 22 is lowered. If all of these levers are not in neutral, the notification lamp 67 flashes and the notification buzzer 65 sounds intermittently, thereby prompting the driver to confirm the operation position of each lever. I can.

The operating positions of the main shift lever 14, sub-shift lever 16, and PTO shift lever 17 are determined by inputs from a main shift neutral sensor 14a (Fig. 4), a sub-shift neutral sensor 16a, and a PTO neutral sensor 17a provided at the neutral positions of each lever. It is determined by the presence or absence of a signal.

If the work implement 22 operates while the vehicle is traveling, it is not preferable in terms of safety. However, by changing the position of the work implement 22 when the tractor is stopped, with the main gear shift lever 14, the sub gear shift lever 16, and the PTO gear shift lever 17 all in neutral, the work implement 22 can be placed in an appropriate position before traveling on the road. and safety is ensured.

1 Traveling vehicle body 11 Accelerator pedal 16 Auxiliary transmission lever 41 Pedal sensor 42 Mark sensor 43 Auxiliary transmission sensor 70 Low-speed vehicle mark E Engine 100 Control device S1 Road driving mode S2 Work driving mode

Claims (3)

A work vehicle having a detachable low-speed vehicle mark (70) on the rear part of a traveling vehicle body (1), wherein a pedal sensor (41) for detecting depression of an accelerator pedal (11) for shifting rotation of an engine (E); A work vehicle characterized by providing a mark sensor (42) for detecting mounting of a vehicle mark (70), and issuing an alarm when an accelerator pedal (11) is depressed without the mark sensor (42) detecting mounting. . A control device (100) for controlling traveling speed is provided with a road traveling mode (S1) and a work traveling mode (S2), and a mark sensor (42) attaches a low speed vehicle mark (70) when the road traveling mode (S1) is set. 2. The work vehicle according to claim 1, wherein an alarm is issued when the accelerator pedal (11) is depressed without detecting A sub-transmission sensor (43) is provided for detecting a shift operation of the sub-transmission lever (16) to a high speed suitable for the road speed, and the mark sensor (42) detects a shift to a low speed when the sub-transmission sensor (43) detects a shift. 2. The work vehicle according to claim 1, wherein an alarm is issued if the accelerator pedal (11) is depressed without detecting attachment of the vehicle mark (70).

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