JP2021083422A - Work vehicle - Google Patents

Abstract

To provide a work vehicle that makes it possible to simply manage work time of a work machine.SOLUTION: A tractor 1 comprises: a travel vehicle body 2 having a rear part to which a work machine 60 is coupled in a replaceable manner; an engine E to be a driving source for a travel device 5 and the work machine 60; a PTO shaft 11 for outputting power from the engine E to the work machine 60; a PTO clutch 55 for turning on/off power transmission to the PTO shaft 11; a PTO switch 25 for switching a turning on/off operation of the PTO clutch 55; an oil temperature sensor 20 for detecting an oil temperature of hydraulic oil of the work machine 60; and a controller 40 for executing travel control of the travel vehicle body 2 and operation control of the work machine 60. The controller 40 comprises: an integration unit 44 for integrating, as integration target time, time in which a rise amount per unit time of the oil temperature is equal to or larger than a predetermined value and the PTO switch 25 is in an ON state; and a notification unit 45 for outputting a notification signal for promoting maintenance of the work machine 60 when the integrated time by the integration unit 44 reaches predetermined time.SELECTED DRAWING: Figure 2

Description

The present invention relates to a work vehicle.

Conventionally, the PTO shaft that transmits the power from the engine to the work machine connected to the traveling vehicle body, the rotation sensor of the PTO shaft, the vehicle speed sensor, and the load sensor of the work machine are provided, and the first is based on the detection result of the rotation sensor. There is a work vehicle capable of recording the cumulative working time of the work machine by the recording method of 1, the second recording method based on the detection result of the vehicle speed sensor, and the third recording method based on the detection result of the load sensor.

In such a work vehicle, one of the above three recording methods can be selected according to the type of the specified work machine, and when the cumulative time reaches a predetermined time, it is possible to notify that the maintenance time is reached. It is known (see, for example, Patent Document 1).

2017-117257

However, the conventional work vehicle has a large amount of data to be recorded and processed, and a large number and types of sensors required to acquire the data, which may increase the cost of the vehicle.

The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle capable of easily managing the work time of a work machine while having an inexpensive configuration.

In order to solve the above-mentioned problems and achieve the object, the work vehicle (1) according to claim 1 is provided with a traveling device (5), and the work machine (60) can be interchangeably connected to the rear portion. Power from the traveling vehicle body (2), the engine (E) mounted on the traveling vehicle body (2) and serving as a drive source for the traveling device (5) and the working machine (60), and the power from the engine (E). A PTO shaft (11) capable of outputting to the working machine (60), a PTO clutch (55) that performs an on / off operation for connecting and disconnecting the power transmitted to the PTO shaft (11), and the PTO clutch ( A PTO switch (25) that switches the on / off operation of 55), an oil temperature sensor (20) that detects the temperature of the hydraulic oil of the working machine (60), running control of the traveling vehicle body (2), and the working machine. The control device (40) includes a control device (40) that executes the operation control of (60), and the control device (40) has a rise amount of the oil temperature per unit time of a predetermined value or more and the PTO switch (25). ) Is on as the integration target time, and when the integration time by the integration unit (44) reaches a predetermined time, a notification signal prompting the maintenance of the work machine (60) is sent. It is characterized by including a notification unit (45) for outputting.

According to the work vehicle according to claim 1, the working time of the work machine can be easily managed with an inexpensive configuration.

According to the work vehicle according to claim 2, in addition to the effect according to claim 1, since the timing at which the work is completed can be accurately detected, it is possible to easily manage the work time of the work machine with an inexpensive configuration. it can.

It is a schematic side view of the tractor which is a work vehicle which concerns on embodiment. It is a block diagram centering on the control device of the tractor of the same as above. It is a block diagram which shows the connection relationship between the control device of the tractor and the work machine of the same above. It is a flowchart which shows an example of the maintenance time detection process of the work machine in the above-mentioned tractor. It is a flowchart which shows an example of the integration process in the maintenance time detection process of the same above.

Hereinafter, embodiments of the work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

First, the overall configuration of the tractor 1 which is the work vehicle according to the embodiment will be described with reference to FIG. FIG. 1 is an explanatory view of the tractor 1 and is a schematic side view of the tractor 1.

The tractor 1 is an agricultural tractor that works in a field or the like while running on its own. Further, the tractor 1 can perform a predetermined work while the operator (also referred to as an operator) is on board and travels in the field.

In the following, 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 is to move in the direction from the driver's seat 8 to the steering wheel 9 in the straight direction of the tractor 1, and the opposite direction is the reverse (backward) direction. Further, the front and rear of the tractor 1 are based on the forward direction.

The left-right direction is a direction horizontally orthogonal to the front-rear direction. Here, the left and right are defined toward the "front" side in the front-rear direction. That is, when the operator arrives at the driver's seat 8 and faces forward, the left hand side is "left" and the right hand side is "right". Further, the vertical direction is a direction orthogonal to the front-rear direction and the left-right direction. Therefore, the front-back direction, the left-right direction, and the up-down direction are orthogonal to each other in three dimensions.

As shown in FIG. 1, the tractor 1 includes a traveling vehicle body 2 and a working machine 60. The traveling vehicle body 2 includes a vehicle body frame 3, a steering wheel 4, a traveling device 5, a bonnet 6, an engine E, a control unit 7, and a mission case 10. The vehicle body frame 3 is the main frame of the traveling vehicle body 2.

The steering wheels 4 are a pair of left and right wheels, are located at the front portion of the traveling vehicle body 2, and are rotatably connected to the axle. The traveling device 5 is configured as a crawler type having a track, is a pair on the left and right, and is located at the rear portion of the traveling vehicle body 2. The traveling device 5 has a rubber crawler stretched between a drive sprocket connected to a drive shaft and a plurality of stretched wheels.

The upper part of the traveling device 5 is covered with a fender 22, and a grip 28 that an operator (operator) can grip when getting on and off is provided at the rear part of the fender 22. Further, a PTO switch 25 is provided at a position below the grip 28 on the fender 22. By operating the PTO switch 25, the on / off operation of the PTO clutch (see FIG. 2), which will be described later, can be switched.

The tractor 1 may be configured by providing wheels serving as driving wheels instead of the crawler type traveling device 5. Further, in this case, the steering wheel 4 may also be a four-wheel drive (4WD) as a driving wheel.

The bonnet 6 is provided so as to be openable and closable at the front portion of the traveling vehicle body 2. The bonnet 6 can be rotated (opened and closed) in the vertical direction with the rear portion as the center of rotation. The bonnet 6 covers the engine E mounted on the vehicle body frame 3 in a closed state. The engine E is a drive source for the tractor 1 and is a heat engine such as a diesel engine or a gasoline engine.

The control unit 7 is provided on the upper portion of the traveling vehicle body 2, and includes a driver's seat 8, a steering wheel 9, and the like. The control portion 7 of the tractor 1 according to the present embodiment is an open type without a cabin or the like, and a safety bar 29 is provided at the rear portion so as to be tiltable. As a matter of course, the control unit 7 may be provided in the cabin provided on the traveling vehicle body 2.

The driver's seat 8 is the driver's seat. The steering wheel 9 can steer the steering wheel 4 by being operated by the operator. The steering unit 7 is provided with a display device 100 that displays various information in front of the steering wheel 9.

In addition to the brake pedal 70, the control unit 7 includes various operation pedals such as an accelerator pedal and a clutch pedal, and various operation levers such as a forward / backward advance lever, an accelerator lever, a main shift lever, and an auxiliary shift lever. When the operator depresses the brake pedal 70, the braking device 53 (see FIG. 2) is activated, and the braking operation for stopping the rotation of the steering wheel 4 and the traveling device 5 is possible.

The transmission case 10 houses a transmission (transmission mechanism). The transmission appropriately decelerates the power (rotational power) transmitted from the engine E and transmits it to the traveling device 5 and the PTO (Power Take-off) shaft 11 described later.

A work machine 60 that performs work in the field is connected to the rear portion of the traveling vehicle body 2, and a PTO shaft 11 that transmits power for driving the work machine 60 projects rearward from the mission case 10. The PTO shaft 11 transmits the rotational power appropriately decelerated by the transmission to the working machine 60 mounted at least at the rear of the traveling vehicle body 2. The work machine 60 in the present embodiment is a ground work machine that performs work in the field, and is a rotary cultivator described later, but various work machines 60 can be interchangeably connected.

Further, an elevating device 12 for raising and lowering the work machine 60 is provided at the rear portion of the traveling vehicle body 2. The elevating device 12 moves the working machine 60 to a non-working position by raising the working machine 60. Further, the elevating device 12 moves the work machine 60 to the ground work position by lowering the work machine 60. The lifting device 12 includes a hydraulic lifting cylinder 121, a lift arm 122, a lift rod 123, a lower link 124, and a top link 125.

When hydraulic oil is supplied to the elevating cylinder 121, the lift arm 122 rotates so as to raise the work machine 60 around an axis serving as a rotation fulcrum, and when the hydraulic oil is discharged from the elevating cylinder 121, the shaft The work machine 60 is rotated around so as to lower it. A lift arm sensor 26 (see FIG. 2) for detecting the rotation angle of the lift arm 122 is provided at the base of the lift arm 122. The height of the working machine 60 is calculated based on the detection result of the lift arm sensor 26.

Further, the lift arm 122 is connected to the lower link 124 via the lift rod 123. In this way, the elevating device 12 connects the working machine 60 to the traveling vehicle body 2 so as to be able to move up and down by the lower link 124 and the top link 125.

In the rotary tiller, which is the work machine 60, the tiller claw 61 is rotated by the power transmitted from the PTO shaft 11 to cultivate the field scene (soil).

Further, as shown in the figure, the work machine 60 includes a transmission mechanism including a gear, a chain, and the like, and also includes a transmission case 63 filled with hydraulic oil. A drain hole is formed in the lower part of the transmission case 63, and a drain bolt is attached to the drain hole.

In the present embodiment, an oil temperature sensor 20 (see FIG. 2) capable of detecting the temperature of hydraulic oil is attached between the drain bolt and the case body. By detecting the detection result of the oil temperature sensor 20, that is, the oil temperature of the hydraulic oil, the state of the working machine 60 can be grasped to some extent.

Next, the control system of the tractor 1 will be described with reference to FIG. FIG. 2 is a block diagram centered on the control device 40 of the tractor 1. As shown in FIG. 2, the control device 40 includes an engine ECU (Electronic Control Unit) 41, a traveling system ECU 42, and a working machine system ECU 43. Further, the control device 40 includes an integrating unit 44 and a notification unit 45.

The engine ECU 41 controls the rotation speed of the engine E and the like. The traveling system ECU 42 controls the overall traveling of the traveling vehicle body 2 (see FIG. 1) by controlling the steering device 51, the transmission device 52, and the braking device 53. The work equipment system ECU 43 controls the elevating device 12 to control the elevating and lowering of the work machine 60, and also controls the solenoid valve 54 that turns on and off the PTO clutch 55 to control the overall drive of the work machine 60.

Further, the integration unit 44 integrates the time when the amount of increase in the oil temperature detected by the oil temperature sensor 20 per unit time is equal to or greater than a predetermined value and the PTO switch 25 is on as the integration target time. When the integration time by the integration unit 44 reaches a predetermined time, the notification unit 45 outputs a notification signal prompting maintenance of the work machine 60. Specifically, in the present embodiment, the replacement time of the hydraulic oil is notified.

The control device 40 can control each part by electronic control, and is composed of a processing unit having a CPU (Central Processing Unit) and the like, a hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. It is equipped with a storage unit that stores various programs and data.

As shown in FIG. 2, various sensors such as an engine rotation sensor 23, a vehicle speed sensor 24, an oil temperature sensor 20, a lift arm sensor 26, and a PTO sensor 27 are connected to the control device 40, and a PTO switch 25 is connected. It is connected.

The engine rotation sensor 23 detects the rotation speed of the engine E. The vehicle speed sensor 24 is for calculating the traveling speed (vehicle speed) of the traveling vehicle body 2. Here, the rotation speed of the axle is detected and the vehicle speed is calculated by the control device 40. Further, the lift arm sensor 26 detects the rotation angle of the lift arm 122. Further, the PTO sensor 27 detects the rotation of the PTO shaft 11.

The oil temperature sensor 20 can detect the temperature (oil temperature) of the hydraulic oil in the transmission case 63 of the working machine 60 and output it to the control device 40. The oil temperature sensor 20 in the present embodiment outputs the unique identification information 21 assigned to each work machine 60 to the control device 40 together with the detection temperature.

Further, from the PTO switch 25, an on / off signal as to whether or not to connect the PTO clutch 55 is output and input to the control device 40 according to the operation of the operator.

In this way, the control device 40 controls the engine E, and also controls the steering device 51 including the power steering mechanism and the like that assists the operation of the steering wheel 9, and the braking device 53 including the brake pedal 70. Controls the running of the vehicle body 2. Further, the control device 40 controls the elevating device 12 to start the elevating operation of the work machine 60, and controls the drive of the solenoid valve 54 in response to the signal from the PTO switch 25 to turn on / off the PTO clutch 55. Controls the operation of the work machine 60.

Further, the tractor 1 according to the present embodiment can notify the replacement time of the hydraulic oil regarding the maintenance of the working machine 60. That is, the control device 40 integrates the time when the oil temperature detected by the oil temperature sensor 20 described above is equal to or higher than the predetermined temperature and the PTO switch 25 is on as the integration target time, and the integration time becomes the predetermined time. When it reaches the limit, a display prompting the replacement of the hydraulic oil of the work machine 60 is displayed on the display device 100 provided in the control unit 7. The specific display mode can be set as appropriate.

At this time, the oil temperature sensor 20 outputs the unique identification information of the working machine 60 to the control device 40. Therefore, in the present embodiment, the control device 40 has an appropriate replacement time of the hydraulic oil of the rotary cultivator. Can be notified. Further, for example, when the working machine 60 is replaced from a rotary cultivator to a plow or the like, the replacement time of the hydraulic oil of the plow is determined based on the detection temperature of the hydraulic oil in the plow and the integrated operating time (when the PTO switch 25 is turned on). It can be notified.

That is, the tractor 1 according to the present embodiment can be freely replaced with a plurality of different types of working machines 60. Therefore, in the present embodiment, the oil temperature sensor 20 is provided in each work machine 60, and the oil temperature sensor 20 can output the identification information for identifying the work machine 60.

FIG. 3 is a block diagram showing a connection relationship between the control device 40 of the tractor 1 and the working machine 60 according to the embodiment. As shown in the figure, the traveling vehicle body 2 of the tractor 1 can be connected to a plurality of working machines A to N, for example, and when each working machine 60 is connected to the traveling vehicle body 2, the communication unit is connected. The identification information is output to the control device 40 via the 30.

The communication unit 30 may be a wired system or a wireless system, but the communication result is displayed on the display device 100 (see FIG. 1) provided in the control unit 7. For example, the display device 100 displays the type of working machine 60 and the current oil temperature. Then, the display device 100 displays the operating time of the working machine 60 accumulated by the control device 40, and when the operating time reaches the hydraulic oil replacement time, a sign prompting the hydraulic oil to be replaced. Is also displayed. Such a sign may be a light emission (including blinking) of a lamp, or may be digitally displayed on a liquid crystal panel or the like.

The control device 40 integrates the time when the oil temperature is 50 ° C. or higher and the PTO switch 25 is on for each input identification information as the integration target time.

By the way, when the detected value of the oil temperature sensor 20 is less than 50 ° C., the control device 40 does not add it to the integration target time, and when the detected value is 50 ° C. or more, it integrates it as the integration target time. There is. This is because, in the hydraulic oil of the working machine 60, if the oil temperature is less than 50 ° C., the deterioration of the oil quality does not progress so much.

Further, the control device 40 controls the solenoid valve 54 so as to disengage the PTO clutch 55 when the detected value of the oil temperature sensor 20 is 120 ° C. or higher. That is, in the hydraulic oil of the working machine 60, if the oil temperature becomes 120 ° C. or higher, it is considered that some abnormality has occurred in the working machine 60. Therefore, by stopping it promptly, it is prevented from leading to a major failure. At the same time, I try to keep my work safe.

In this way, the control device 40 integrates the time during which the PTO switch 25 is in the state when the oil temperature of the hydraulic oil is 50 ° C. to 120 ° C., for example, the oil temperature of the hydraulic oil is In the case of 100 ° C. to 120 ° C., the correction process is performed by multiplying the integration target time by a predetermined coefficient larger than 1. The coefficient can be appropriately determined from an empirical value regarding the relationship between temperature and deterioration. As a result, the time is weighted at the temperature at which the deterioration of the hydraulic oil is accelerated, so that the hydraulic oil replacement time can be derived more accurately.

Here, the flow of the maintenance time detection process in the tractor 1 will be described with reference to FIGS. 4 and 5. 4 and 5 are a flowchart showing an example of the maintenance time detection process of the work machine 60 in the tractor 1, and FIG. 5 is a flowchart showing an example of the integration process in the maintenance time detection process. The maintenance time detection process shown in FIG. 4 is always repeatedly executed at predetermined intervals during the work by the tractor 1.

In the maintenance time detection process in the tractor 1, as shown in FIG. 4, first, in the control device 40, the amount of increase in the oil temperature per unit time is a predetermined value (for example, 0.5 ° C. per second) or more, and the PTO. It is determined whether or not the integrated time of the time when the switch 25 is on has reached the predetermined time (step S110). The predetermined time is predetermined according to the type of the working machine 60 and the like.

When the integration time reaches a predetermined time (step S110: Yes), the control device 40 indicates to the display device 100 that it is time to replace the hydraulic oil (step S120), and ends the maintenance time detection process.

On the other hand, when it is determined that the integrated time has not reached the predetermined time (step S110: No), the control device 40 determines whether or not the amount of increase in the oil temperature per unit time is equal to or greater than the predetermined value (step). S130).

Then, when it is determined that the amount of increase in the oil temperature per unit time is equal to or greater than a predetermined value (step S130: Yes), the control device 40 determines whether or not the PTO switch 25 is in the ON state (step S140). .. The order of the processes in steps S130 and S140 may be reversed.

In step S140, when the control device 40 determines that the PTO switch 25 is in the ON state (step S140: Yes), the integration process is executed (step S150). After that, the control device 40 determines whether or not the amount of decrease in the oil temperature per unit time is equal to or higher than a predetermined value (for example, 0.5 ° C. per second) (step S160). When it is determined that the amount of decrease in the oil temperature per unit time is less than a predetermined value (step S160: No), it is determined whether or not the oil temperature is 120 ° C. or higher (step S170), and when it is 120 ° C. or higher. When the determination is made (step S170: Yes), the PTO clutch 55 is disengaged (step S180), the integration process is completed (step S190), and then the maintenance time detection process is completed.

On the other hand, when it is determined in step S130 that the amount of increase in oil temperature per unit time is not equal to or higher than a predetermined value (step S130: No), and when it is determined in step S140 that the PTO switch 25 is not in the ON state (step S140: No), and further, when it is determined in step S170 that the oil temperature is not 120 ° C. or higher (step S170: No), the control device 40 returns the process to step S110. Further, if it is determined in step S160 that the amount of decrease in the oil temperature per unit time is equal to or greater than a predetermined value, the integration process is completed (step S190), and then the maintenance time detection process is completed.

FIG. 5 is a flowchart showing an example of the integration process in the maintenance time detection process. In the maintenance time detection process shown in FIG. 4, the integration process executed in step S150 first determines whether or not the oil temperature of the control device 40 is between 100 ° C. and 120 ° C., as shown in FIG. Is determined (step S151).

Then, when the oil temperature is between 100 ° C. and 120 ° C. (step S151: Yes), the control device 40 performs a correction process of multiplying the integration target time by a predetermined coefficient larger than 1 to integrate the oil (step S151: Yes). Step S152).

On the other hand, when the oil temperature is not between 100 ° C. and 120 ° C. (step S151: No), the control device 40 performs normal integration (step S153).

In the present embodiment, the above-mentioned maintenance time detection process is individually performed for a plurality of working machines 60 that can be freely replaced with the traveling vehicle body 2. Therefore, even if the working machine 60 is changed, the working time of each working machine 60 can be managed accurately and easily, and the replacement time of the hydraulic oil can be accurately known.

In the tractor 1 described above, the time to replace the hydraulic oil is displayed on the display device 100 provided in the control unit 7, but it may be displayed on a tablet terminal carried by the operator, for example. it can. Further, a mobile terminal device such as a smartphone can be used instead of the tablet terminal.

Further, the detection results of various sensors including at least the detection results of the oil temperature sensor 20 can be transmitted to, for example, a dedicated terminal device for agricultural support, and the oil temperature of the hydraulic oil can be managed externally.

When it is determined from the oil temperature data accumulated in the dedicated terminal device for agricultural support that it is time to replace the hydraulic oil, the dedicated terminal device interrupts the display device 100 of the tractor 1 to replace the hydraulic oil. It is good to notify at any time. In the case of notification by interruption, a mode in which a lamp blinks, a warning sound such as an alarm, or a voice is emitted can be considered.

Further, when transmitting an instruction signal for notifying the hydraulic oil replacement time from the dedicated terminal device for agricultural support to the display device 100 of the tractor 1, for example, maintenance that becomes a service staff of a manufacturer or a dealer of the work machine 60. It is also possible to construct a system capable of notifying the administrator of the replacement time of the hydraulic oil and the abnormality of the working machine 60.

Of course, a worker who has found out the time to replace the hydraulic oil or an abnormality in the work machine 60 from the notification of the display device 100 can contact the service staff using a smartphone or a tablet terminal. Alternatively, a dedicated communication button or the like that is wirelessly connected directly to the service staff may be provided in the vicinity of the display device 100 so that the hydraulic oil can be replaced or the work equipment 60 can be requested to be repaired.

Further, a PTO shift switch (not shown) for shifting the PTO is provided, and when the PTO switch 25 is in the ON state and the PTO shift switch is in the ON state, the current oil temperature of the hydraulic oil is displayed on the display device 100. In addition to displaying it, it may be integrated as the actual operating time of the work machine 60. That is, since the oil temperature of the hydraulic oil of the work machine 60 does not drop for a while even after the work is stopped, the state of the PTO shift switch that is turned on when actually operating is integrated as the operating time. It is an addition to the conditions.

The following tractor 1 is realized by the above-described embodiment.

(1) A traveling vehicle body 2 provided with a traveling device 5 and capable of being interchangeably connected to the work machine 60 at the rear, an engine E mounted on the traveling vehicle body 2 and serving as a drive source for the traveling device 5 and the working machine 60. The PTO shaft 11 that can output the power from the engine E to the work machine 60, the PTO clutch 55 that performs the on / off operation for connecting and disconnecting the power transmitted to the PTO shaft 11, and the on / off operation of the PTO clutch 55 are switched. A control device including a PTO switch 25, an oil temperature sensor 20 that detects the oil temperature of the hydraulic oil of the work machine 60, and a control device 40 that executes running control of the traveling vehicle body 2 and operation control of the working machine 60. Reference numeral 40 denotes an integration unit 44 that integrates the time when the amount of increase in the oil temperature per unit time is equal to or greater than a predetermined value and the time when the PTO switch 25 is on as the integration target time, and the integration time by the integration unit 44 is the predetermined time. A tractor 1 including a notification unit 45 that outputs a notification signal prompting maintenance of the work equipment 60 when the speed is reached.

According to the tractor 1, the working time of the working machine 60 can be easily managed with an inexpensive configuration, and the hydraulic oil can be replaced at an appropriate time.

(2) In the above (1), the tractor 1 ends the integration when the amount of decrease in the oil temperature per unit time becomes a predetermined value or more during the integration as the integration target time.

According to the tractor 1, in addition to the effect of (1), the timing at which the work is completed can be accurately detected, so that the working time of the working machine can be easily managed.

(3) In the above (1) or (2), the oil temperature sensor 20 is a tractor 1 provided in the work machine 60.

According to the tractor 1, since it is not necessary to provide an oil temperature sensor on the traveling vehicle body 2, the vehicle body cost of the tractor 1 can be reduced in addition to the effects of (1) or (2).

(4) In any of the above (1) to (3), the maintenance includes at least the hydraulic oil change, and the traveling vehicle body 2 is a tractor 1 including a display device 100 for displaying a suitable time for the hydraulic oil change.

According to the tractor 1, in addition to the effects of any of the above (1) to (3), it is easy to grasp the time to change the hydraulic oil, and the hydraulic oil can be changed at an appropriate time. It is also possible to extend the life of the product.

(5) In any of the above (1) to (4), when the control device 40 executes the integration, if the detection value of the oil temperature sensor 20 is included in the range of 100 to 120 ° C., the integration target time. A tractor 1 that performs correction processing by multiplying by a predetermined coefficient larger than 1.

According to the tractor 1, in addition to the effects of any of the above (1) to (4), the maintenance time can be derived more accurately.

(6) In any of the above (1) to (5), when the detected value of the oil temperature sensor 20 is less than 50 ° C, the control device 40 does not add to the integration target time, and when the detected value is 50 ° C or more. Tractor 1 to be integrated as the integration target time.

According to the tractor 1, in addition to the effects of any of the above (1) to (5), for example, there is no possibility of urging the replacement of the hydraulic oil even though the deterioration of the hydraulic oil has not progressed. ..

(7) In any of the above (1) to (6), the control device 40 disengages the PTO clutch 55 when the detected value of the oil temperature sensor 20 is 120 ° C. or higher.

According to the tractor 1, in addition to the effect of any of the above (1) to (6), the work machine 60 is prevented from failing by stopping the use of the work machine 60 which is determined to have an abnormality in the drive system. It can be prevented and work safety can be achieved.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described as described above. Therefore, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

E engine 1 tractor (working vehicle)
2 Traveling vehicle body 5 Traveling device 11 PTO axis 20 Oil temperature sensor 25 PTO switch 40 Control device 44 Integration unit 45 Notification unit 55 PTO clutch 60 Work equipment 100 Display device

Claims (2)

Equipped with a traveling device, a traveling vehicle body that can be freely connected to the work equipment at the rear,
An engine mounted on the traveling vehicle body and serving as a driving source for the traveling device and the working machine.
A PTO shaft capable of outputting power from the engine to the work machine,
A PTO clutch that performs on / off operation to connect and disconnect the power transmitted to the PTO shaft,
A PTO switch that switches the on / off operation of the PTO clutch,
An oil temperature sensor that detects the oil temperature of the hydraulic oil of the work machine, and
A control device that executes running control of the traveling vehicle body and operation control of the working machine,
With
The control device is
An integration unit that integrates the time when the amount of increase in oil temperature per unit time is equal to or greater than a predetermined value and the PTO switch is on as the integration target time.
When the integration time by the integration unit reaches a predetermined time, a notification unit that outputs a notification signal prompting maintenance of the work machine, and a notification unit.
A work vehicle characterized by being equipped with. During the integration as the integration target time, the integration ends when the amount of decrease in the oil temperature per unit time exceeds a predetermined value.
The work vehicle according to claim 1.

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