JP2022178345A - work vehicle - Google Patents

Abstract

To notify that a low speed travelling vehicle mark is not affixed during travelling on a road by calling an operator's attention with a warning when the operator steps on an accelerator pedal for travelling on a road and starts travelling without the low speed travelling vehicle mark affixed to a predetermined position of the travelling vehicle body when the operator is about to travel on a general road in a work vehicle with a work machine in a rear part of the travelling vehicle body.SOLUTION: A work vehicle in which a low speed vehicle mark 70 can be detachably affixed to the rear part of a travelling vehicle body 10 on which a work machine 11 is mounted is provided with an accelerator pedal 530 for changing the revolution of an engine 30 during travelling on a road, and an accelerator lever 470 for changing the revolution of the engine 30 during work travelling. When the accelerator pedal 530 is depressed when the low speed vehicle mark 70 is not affixed, a warning is issued.SELECTED DRAWING: Figure 5

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 Patent Document 1 travels by raising the working machine attached to the rear part of the vehicle body, but the low-speed traveling vehicle mark attached to the rear part of the vehicle body cannot be seen from the rear because it is blocked by the working machine. If this is the case, it is devised to notify the worker who operates the work vehicle of this fact and call attention to it.

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 vehicle is not marked with a low-speed vehicle mark, so it moves to a general road without a low-speed vehicle mark. If you do, you will be in danger without warning.

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, even if a low-speed traveling vehicle mark is not attached to a predetermined position of the traveling vehicle body, the accelerator is used for traveling on the road. The problem is to inform the driver that the low-speed vehicle mark is not attached when the vehicle is traveling on the road by issuing an alarm when the vehicle starts to travel by depressing the pedal.

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

The invention of claim 1 is a working vehicle in which a low-speed vehicle mark 70 is detachably attached to the rear part of a traveling vehicle body 10 to which a working machine 11 is attached. The work vehicle is characterized by providing an accelerator lever 470 for changing the rotation of 30 and issuing an alarm when the accelerator pedal 530 is stepped on when the low speed vehicle mark 70 is not mounted.

The invention of claim 2 comprises a brake pedal connector 710 that connects left and right brake pedals 510L and 510R that brake the left and right rear wheels 50L and 50R, respectively, and a brake pedal disconnection pedal 520 that disconnects the brake pedal connector 710. 2. The operation according to claim 1, wherein a brake pedal connection lock release lever 420 for releasing the depression lock is provided, and an alarm is issued when the accelerator pedal 530 is stepped on while the brake pedal connection lock release lever 420 is released. vehicle.

According to the invention of claim 1, when the traveling vehicle body 10 travels in a work area such as a field, the accelerator lever 470 is exclusively used to change the rotation of the engine 30, but for traveling on the road, the accelerator pedal 530 is depressed to stop traveling. When trying to start, an alarm is issued if the low-speed vehicle mark 70 is not attached, so the operator stops the start of traveling and attaches the low-speed vehicle mark 70 to a predetermined position of the traveling vehicle body 10, so that safe road traveling is possible. becomes possible.

In the invention of claim 2, the left and right brake pedals 510L and 510R used in the workshop are connected by the brake pedal connector 710 when traveling on the road so as to prevent one-way braking, but when traveling in the workshop, the brake pedal connection is locked. A release lever 420 is used to make the brake pedal connection release pedal 520 into a state in which it cannot be stepped on. For this reason, the state where the brake pedal connection lock release lever 420 can be used to depress the brake pedal connection release pedal 520 is limited to driving on the road. When the vehicle 530 is stepped on, an alarm is issued to make the driver surely recognize the start of traveling on the road, and the low-speed vehicle mark 70 is attached to a predetermined position of the traveling vehicle body 10, so that safe traveling can be ensured. .

1 is a schematic left side view of an agricultural tractor according to an embodiment of the present invention; FIG. 1 is a partial perspective view (part 1) of an operating unit of an agricultural tractor according to an embodiment of the present invention; FIG. FIG. 2 is a partial perspective view (part 2) of the operating unit of the agricultural tractor according to the embodiment of the present invention; 1 is a schematic plan view of an agricultural tractor according to an embodiment of the present invention; FIG. 1 is a control block diagram of an agricultural tractor according to an embodiment of the present invention; FIG. 1 is a partial perspective view of the vicinity of left and right brake pedals of an agricultural tractor according to an embodiment of the present invention; FIG. 1 is a schematic partial left side view of a brake pedal disconnection mechanism for an agricultural tractor according to an embodiment of the present invention; FIG. (a) Schematic partial left side view of the vicinity of the brake pedal disconnection pedal of the agricultural tractor according to the embodiment of the present invention (Part 1), (b) Brake pedal connection of the agricultural tractor according to the embodiment of the present invention FIG. 11 is a schematic partial left side view (part 2) of the vicinity of the release pedal; (a) Schematic partial plan view of the vicinity of the forward/reverse lever of the agricultural tractor according to the embodiment of the present invention (part 1), (b) Schematic representation of the vicinity of the forward/reverse lever of the agricultural tractor according to the embodiment of the present invention FIG. 2C is a schematic partial plan view (No. 2), and (c) a schematic partial plan view (No. 3) of the vicinity of the forward/reverse lever of the agricultural tractor according to the embodiment of the present invention; It is a front view of the low-speed vehicle mark of the agricultural tractor of embodiment in this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration and operation of an agricultural tractor, which is an example of a work vehicle according to the present invention, will be specifically described with reference to FIGS. 1 to 3. FIG.

1 is a schematic left side view of an agricultural tractor as a working vehicle of the present invention, and FIGS. 2 and 3 are partial perspective views (parts 1 and 2) of an operation unit 20 of the agricultural tractor. be.

An engine 30 is provided inside the front bonnet of the traveling vehicle body 10 .

Rotational power of the engine 30 is transmitted through various clutches inside a transmission case provided below the floor 22 of the operation unit 20 . Then, the rotational power changed by the transmission is transmitted to the left front wheel 40L and the right front wheel 40R as well as the left rear wheel 50L and the right rear wheel 50R.

The operation unit 20 includes a tillage implement lift switch 610, a main speed change switch 620, a constant rotation switch 630, a differential lock switch 640, and a PTO (Power Take Off) switch 650, as well as a tillage implement lift lever 410 and an auxiliary shift lever. An auxiliary shift lever 460 with an attached main shift switch 461 and an accelerator lever 470 are provided.

A brake pedal connection lock release lever 420, a steering wheel tilt lever 430, a parking lever 440, a PTO shift lever 450, and a steering handle 23 are provided behind the engine 30. Behind the steering handle 23, a driver's seat 21 is provided. is provided.

The hose cover covers the hose connected to the steering handle 23.

A brake pedal disconnection pedal 520 and a clutch pedal 540 are arranged on the floor 22 on the left side of the operation column cover.

A left brake pedal 510L, a right brake pedal 510R, and an accelerator pedal 530 are arranged on the floor 22 on the right side of the operation column cover.

A working machine 11 such as a rotary tillage machine is attached to the rear portion of the traveling vehicle body 10 using, for example, a three-point link mechanism.

The tillage machine lifting mechanism 60 has a main cylinder 61, a lift arm 62, a top link 63 and a lower link 64, a rotating cover 65a and a side cover 65b.

Front ends of the top link 63 and the lower link 64 are connected to the traveling vehicle body 10 side, and rear ends of the top link 63 and the lower link 64 are connected to the work implement 11 side. A rear end of a lift arm 62 rotated by the main cylinder 61 is connected to a lower link 64 .

A plowing depth sensor 310 is a sensor that detects the rotation angle of the rotation cover 65 a , and a lift arm sensor 331 is a sensor that detects the rotation angle of the lift arm 62 .

Next, mainly referring to FIGS. 4 and 5, the configuration and operation of the agricultural tractor of this embodiment will be described more specifically.

4 is a schematic plan view of the agricultural tractor according to the embodiment of the invention, and FIG. 5 is a control block diagram of the agricultural tractor according to the embodiment of the invention.

Rotational power of engine 30 is transmitted to left rear wheel 50L and right rear wheel 50R via forward/reverse clutch 121, main transmission portion 111, auxiliary transmission portion 112, and rear wheel differential gear 51. When 4WD (4-wheel drive) driving is performed, the rotational power of engine 30 is transmitted through forward/reverse clutch 121, main transmission section 111, auxiliary transmission section 112, 4WD clutch 122, and front wheel differential gear 41. , to the left front wheel 40L and the right front wheel 40R.

The left brake device 130L is a device that brakes the left rear wheel 50L according to the state of the left brake cylinder 131L. The state of the left brake cylinder 131L is changed by instructions from the left brake pedal 510L and the travel control unit 230. FIG. Instructions from travel control unit 230 are issued using left brake solenoid valve 133 L, relief valve 134 and pump 135 .

The right brake device 130R is a device that brakes the right rear wheel 50R according to the state of the right brake cylinder 131R. The state of right brake cylinder 131R is changed according to instructions from right brake pedal 510R and travel control unit 230. FIG. Instructions from travel control unit 230 are issued using right brake solenoid valve 133R, relief valve 134, and pump 135.

Steering of the front left wheel 40L and the front right wheel 40R is performed according to the state of the steering cylinder 140. FIG. The state of the steering cylinder 140 is changed by instructions from the steering handle 23 .

The controller 200 has a tillage machine lift control section 210, an engine control section 220, and a travel control section 230 that operate in cooperation with each other.

The detected values of engine rotation sensor 341 and rail pressure sensor 342 are input to engine control unit 220 . The engine control unit 220 then controls the high-pressure fuel pump 31 and the high-pressure injector unit 32 having four high-pressure injectors based on the input detection values.

The detected values of the tillage machine elevation sensor 332 , the lift arm sensor 331 and the tillage depth sensor 310 are input to the tillage machine elevation control section 210 . The tillage machine elevation control unit 210 controls the main ascending solenoid valve 66 and the main descending solenoid valve 67 of the main cylinder 61 based on the input detection values.

A brake pedal depression sensor 390, a brake pedal connection lock release sensor 321, a brake pedal connection sensor 320, a steering angle sensor 350, a forward sensor 361, a reverse sensor 362, a main shift switch 620, an auxiliary shift sensor 370, a tillage machine lift switch 610, and A detection value of the accelerator sensor 380 is input to the travel control unit 230 . Then, the travel control unit 230 controls the forward/reverse clutch 121, the main transmission unit 111, the right brake solenoid valve 133R of the right brake cylinder 131R, and the left brake solenoid valve 133L of the left brake cylinder 131L based on the input detection value. do.

Next, mainly referring to FIGS. 6 to 8, the configuration and operation of the left brake pedal 510L, the right brake pedal 510R, and the brake pedal disconnection pedal 520 of the agricultural tractor of the present embodiment will be specifically described. .

Here, FIG. 6 is a partial perspective view of the vicinity of the left brake pedal 510L and the right brake pedal 510R of the agricultural tractor, and FIG. 8(a) and 8(b) are schematic partial left side views (No. 1 and No. 2) near a brake pedal disconnection pedal 520 of an agricultural tractor. FIG.

FIG. 6 shows a state in which the left brake pedal 510L and the right brake pedal 510R are connected by the brake pedal connector 710. As shown in FIG.

In FIG. 7, the state in which the brake pedal connection lock release lever 420 is lifted to release the brake pedal connection lock and the brake pedal connection release pedal 520 is stepped on to release the brake pedal connection is indicated by two-dot chain lines. It is

FIG. 8(a) shows a state in which the brake pedal disconnection pedal 520 is not depressed. FIG. 8B shows a state in which the brake pedal disconnection pedal 520 is depressed, but a state in which the brake pedal disconnection pedal 520 is not depressed is also indicated by a two-dot chain line. In FIG. 8(b), the direction of movement of the lock plate 820 when the brake pedal connection lock release lever 420 is lifted is indicated by an arrow X, and the movement direction of the lock plate 820 when the brake pedal connection release pedal 520 is stepped on. The moving directions of the brake pedal disconnection pedal 520 and the lock plate abutting portion 750 are indicated by arrows Y1 and Y2, respectively.

When the state of the left brake cylinder 131L is changed by a command from the left brake pedal 510L via the left brake rod 132L of the spring-loaded left brake pedal 510L, the left rear wheel 50L is braked.

Braking of the right rear wheel 50R is effected when the state of the right brake cylinder 131R is changed by a command from the right brake pedal 510R via the right brake rod 132R of the spring-loaded right brake pedal 510R.

The brake pedal connector 710 is a bar-shaped connector that is spring-biased by a spring 711 to engage the left brake pedal 510L and the right brake pedal 510R.

In the normal case where the brake pedal disconnection pedal 520 is not depressed and the vehicle is traveling straight ahead, the brake pedal connector 710 engages the left brake pedal 510L and the right brake pedal 510R. Therefore, when at least one of the left brake pedal 510L and the right brake pedal 510R is depressed, both the left rear wheel 50L and the right rear wheel 50R are braked.

When the brake pedal connection release pedal 520 is stepped on and a turning operation is performed during work, the brake pedal connector 710 does not engage the left brake pedal 510L and the right brake pedal 510R. Therefore, when the left brake pedal 510L is depressed, the left rear wheel 50L is braked, and when the right brake pedal 510R is depressed, the right rear wheel 50R is braked.

The wire 720 is a wire whose upper end is connected to the brake pedal connector 710 and whose lower end is connected to the pedal arm 521 of the brake pedal disconnection pedal 520 .

The brake pedal disconnection pedal 520 pivots about a brake pedal disconnection pedal pivot shaft 730 provided at the proximal end of the pedal arm 521 and utilizes the spring biased brake pedal connector 710 as described above. It is a pedal that releases the connection of the brake pedal.

However, when the downwardly spring-biased brake pedal engagement lock release lever 420 is not lifted, the brake pedal engagement release pedal 520 cannot be pivoted and the brake pedal engagement lock is implemented.

A more specific description is as follows.

That is, the rod 810 is a rod whose upper end is connected to the brake pedal connection lock release lever 420 and whose lower end is connected to the lock plate 820 .

Lock plate 820 is a plate that rotates around lock plate rotation shaft 830 .

When the brake pedal connection lock release lever 420 is not lifted, the actuator 321b of the brake pedal connection lock release sensor 321 is separated from the sensing portion 321a of the brake pedal connection lock release sensor 321, so that the brake pedal connection lock is released. Release not detected. Even if the brake pedal connection release pedal 520 is to be stepped on, the lock plate contact portion 750 of the brake pedal connection release pedal rotating shaft 730 is in contact with the lock plate 820, and the brake pedal connection release pedal 520 is not rotated. Therefore, the actuator contact portion 740 of the brake pedal connection release pedal rotation shaft 730 is in contact with the actuator 320b of the brake pedal connection sensor 320, and the actuator 320b of the brake pedal connection sensor 320 is in contact with the brake pedal connection sensor 320. is in contact with the sensing portion 320a of the brake pedal, and the release of the brake pedal connection is not detected.

When the brake pedal connection lock release lever 420 is lifted, the actuator contact portion 840 of the lock plate rotating shaft 830 is in contact with the actuator 321b of the brake pedal connection lock release sensor 321, thereby releasing the brake pedal connection lock. Since the actuator 321b of the sensor 321 is in contact with the sensing portion 321a of the brake pedal connection lock release sensor 321, the release of the brake pedal connection lock is detected. When the brake pedal connection release pedal 520 is stepped on, the lock plate contact portion 750 of the brake pedal connection release pedal rotating shaft 730 is separated from the lock plate 820, and the brake pedal connection release pedal 520 rotates. Therefore, the actuator 320b of the brake pedal engagement sensor 320 is separated from the sensing portion 320a of the brake pedal engagement sensor 320, and the release of the brake pedal engagement is detected.

Next, mainly referring to FIG. 9, the configuration and operation of forward/reverse lever 480 of the agricultural tractor of the present embodiment will be specifically described.

Here, FIGS. 9A to 9C are schematic partial plan views (parts 1 to 3) of the vicinity of the forward/reverse lever 480 of the agricultural tractor according to the embodiment of the present invention.

FIG. 9A shows a state where the forward/reverse lever 480 is in the forward position. FIG. 9B shows a state where the forward/reverse lever 480 is in the neutral position. FIG. 9(c) shows a state where the forward/reverse lever 480 is in the reverse position.

A more specific description is as follows.

That is, the forward/reverse lever 480 is a lever whose lower end is connected to a forward/reverse cam 480 a , and the forward/reverse cam 480 a is a cam that rotates according to the lever position of the forward/reverse lever 480 .

When the lever position of the forward/reverse lever 480 is in the forward position, the actuator 361b of the forward/reverse sensor 361 with which the forward/reverse cam 480a is in strong contact is in contact with the sensing portion 361a of the forward/reverse sensor 361, and the actuator 361b of the forward/reverse sensor 362 is in contact. Since the actuator 362b is separated from the sensing portion 362a of the reverse sensor 362, the forward state is detected.

When the lever position of the forward/reverse lever 480 is at the neutral position, the actuator 361b of the forward sensor 361 is separated from the sensing portion 361a of the forward sensor 361, and the actuator 362b of the reverse sensor 362 is also separated from the sensing portion 362a of the reverse sensor 362. , a neutral state is detected.

When the forward/reverse lever 480 is in the reverse position, the actuator 361b of the forward/reverse sensor 361 is separated from the sensor 361a of the forward/reverse sensor 361, and the forward/reverse cam 480a strongly contacts the reverse sensor 362. Since the actuator 362b is in contact with the sensing portion 362a of the reverse motion sensor 362, the reverse motion state is detected.

FIG. 10 shows a low-speed vehicle mark 70 attached to the rear portion of the traveling vehicle body 10 facing rearward. 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.

Attachment of the low-speed vehicle mark 70 to a predetermined position is detected by the mark sensor 71, and an attachment signal is input to the travel control unit 230, so that an alarm buzzer 72 sounds under the conditions described later.

Next, the configuration and operation of the agricultural tractor controller 200 of the present embodiment will be specifically described.

Various controls performed by the controller 200 will be described in order below.

(A) First, tillage work machine elevation control for raising and lowering the work machine 11 with respect to the traveling vehicle body 10 will be described.

The tillage depth sensor 310 is a sensor that detects the tillage depth of the working machine 11 attached to the traveling vehicle body 10 . The brake pedal connection release mechanism 700 is a mechanism for releasing brake pedal connection between the left brake pedal 510L and the right brake pedal 510R. The brake pedal connection sensor 320 is a sensor that detects the state of brake pedal connection.

The controller 200 controls the elevation of the tillage implement for raising and lowering the implement 11 with respect to the traveling vehicle body 10 based on the detected value of the tillage depth sensor 310 .

The tillage machine lift lever 410 is a lever that gives a user instruction to the controller 200 to raise or lower the work machine 11 with respect to the traveling vehicle body 10 . The tillage work machine lifting lever 410 is an example of a work machine lifting member in the present invention. The user can raise or lower the work implement 11 with respect to the traveling vehicle body 10 by operating the work implement elevating lever 410 to indicate the height of the work implement 11 after elevation.

The tillage machine lift switch 610 is also an example of the tillage machine lift member of the present invention. When the user instructs to raise the work implement 11 by operating the tillage implement lift switch 610, the work implement 11 can be raised to the highest position. The work machine 11 can be lowered to the height where the work machine 11 is located.

A specific description of a U-turn at the edge of a field in plowing work, which involves the above-described components, is as follows.

That is, in tillage work, an agricultural tractor whose controller 200 automatically controls the elevation of the tillage machine to keep the tillage depth at a set value reciprocates the field while repeating U-turns at the edge of the field.

Since such a U-turn is performed with a relatively small turning radius, it is performed using braking of one of the left rear wheel 50L and right rear wheel 50R located on the inner side of the turn.

Therefore, the user lifts the brake pedal connection lock release lever 420 to release the brake pedal connection lock while working in the field, and depresses the brake pedal connection release pedal 520 to brake when the agricultural tractor approaches the edge of the field. Release the pedal connection.

Then, the user quickly turns the steering wheel 23 while depressing the left brake pedal 510L or the right brake pedal 510R in order to use the braking of one of the left rear wheel 50L and the right rear wheel 50R, which are on the inner side of the turn. .

When the steering angle is fixed to the turning angle, the agricultural tractor starts turning during work, and the tillage implement 11 is automatically raised.

When the turning motion of the agricultural tractor is completed, the user quickly turns the steering wheel 23 so that the steering angle is fixed at the straight angle.

Of course, at the time when the turning motion during work is completed, the brake pedal connection lock release lever 420 is not lifted, the brake pedal connection release pedal 520 is not depressed, and the left brake pedal 510L and the right brake pedal 510R are not pressed. not stepped on.

Then, the tilling machine 11, which has been automatically raised, is manually lowered, and the agricultural tractor starts moving straight toward the edge of the next field.

When the agricultural tractor is driven in a field, the acceleration lever 470 is used to set the rotation of the engine 30 to start driving. The brake pedal 510R is stepped on so that a small turn can be made.

When the agricultural tractor is driven on the road, the rotation of the engine 30 is set by the accelerator pedal 530 to start driving. The left and right brake pedals 510L and 510R are integrally connected by making it impossible to step on a brake pedal connection release pedal 520 to prevent sharp turning.

Connection of the left and right brake pedals 510L and 510R is performed by detection of connection by the brake pedal connection sensor 320. FIG. When the brake pedal connection sensor 320 does not detect the connection, the clutch pedal 540 is depressed to shift gears, and the accelerator pedal 530 is depressed to start traveling. If there is, an alarm buzzer 72 is sounded to inform the operator sitting in the driver's seat 21 of the fact, and to urge the worker to attach the low-speed vehicle mark 70 to a predetermined rear portion of the traveling vehicle body 10.例文帳に追加Simultaneously with this warning, it is preferable to display that the low-speed vehicle mark is not installed on the operation panel provided on the front side of the steering wheel 23 .

10 traveling vehicle body 11 work machine 30 engine 70 low speed vehicle mark 420 brake pedal connection lock release lever 470 accelerator lever 510L left brake pedal 510R right brake pedal 520 brake pedal connection release pedal 530 accelerator pedal 710 brake pedal coupler

Claims (2)

A working vehicle having a detachable low-speed vehicle mark (70) on the rear part of a traveling vehicle body (10) equipped with a working machine (11), and an accelerator pedal (530) for changing the rotation of an engine (30) when traveling on a road and working. This work vehicle is characterized by providing an accelerator lever (470) for changing rotation of an engine (30) during running, and issuing an alarm when an accelerator pedal (530) is stepped on when a low speed vehicle mark (70) is not mounted. A brake pedal connector (710) that connects the left and right brake pedals (510L, 510R) that brake the left and right rear wheels (50L, 50R), respectively, and a brake pedal disconnection pedal that disconnects the brake pedal connector (710). A brake pedal connection lock release lever (420) for releasing the depression lock of (520) is provided, and an alarm is issued when the accelerator pedal (530) is stepped on while the brake pedal connection lock release lever (420) is released. The work vehicle according to claim 1.

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