JP6897542B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle such as an agricultural tractor, and more particularly to a PTO transmission device to a stationary work device.

Conventionally, there is a configuration in which a stationary PTO operating tool for operating a PTO clutch when driving a stationary work machine connected to a tractor is provided on a fender. In addition, by restricting the transmission of the traveling clutch with this stationary PTO operator and restricting the engine stop regardless of the seating sensor's departure detection, it is possible to ensure safety when leaving the seat and to ensure stable stationary operation of the PTO device. (Patent Document 1).

JP-A-2017-7377

According to Patent Document 1, the PTO clutch can be operated by the stationary PTO operating tool, but since the stationary PTO operating tool is provided on the fender, it is excellent in that the PTO control for the stationary work machine can be operated by getting off the tractor body. .. However, if the shift position by the separately provided PTO lever is the neutral position, the PTO output shaft does not rotate even if the PTO clutch operates. Therefore, the operator returns to the cockpit and operates the PTO lever to set the predetermined shift position. Immediately after this setting, the PTO output shaft rotates, and each rotating part of the stationary work machine also drives and rotates, which is dangerous when there is an auxiliary worker.

In view of the above, the present invention aims for safe stationary work by preventing the PTO output shaft from rotating immediately by operating the PTO lever.

In view of the above, the present invention has taken the following technical measures.

The first invention is configured to transmit the power of the engine (5) to the PTO output shaft (10) via the PTO clutch (43) and the PTO transmission (42, 45), and the operator can use the cockpit ( The stationary PTO is provided with a means for stopping the engine (5) at the time of leaving the seat, a means for setting the stationary PTO mode, and a stationary PTO switch (90) for stopping and controlling the engine (5) when the vehicle leaves the seat from 11). In a work vehicle configured to operate the PTO clutch (43) on the entry side by operating the switch (90), the stationary PTO mode setting means includes a means for restraining the engine stop when leaving the seat and the above. A PTO axis non-rotation prevention means capable of detecting that the PTO transmission (42, 45) is in the shift position is configured.
A first notification means (M1) is provided to perform a notification operation during the initial operation of operating the PTO clutch (43) by pressing and holding the stationary PTO switch (90), and the PTO clutch (43) is engaged during the operation. The configuration is such that the PTO clutch (43) is turned off by operating the stationary PTO switch (90), and the second is to perform a notification operation during the stationary PTO driving work from the time when the PTO clutch (43) is turned on to the time when the PTO clutch (43) is turned off. It is a work vehicle characterized by providing a notification means (M2).
In the second aspect of the present invention, the PTO axis non-rotation preventing means serves as a means for confirming whether or not the PTO transmission (42, 45) is in a predetermined shift position, and detects the PTO lever position of the PTO lever (27). This is the first work vehicle of the present invention configured to be confirmed by the detection output of the sensor (27a).
In the third aspect of the present invention, the PTO transmission is a PTO transmission (45) that performs high and low rotation speeds and / or a PTO forward / reverse clutch (42) that sets forward / reverse rotation. It is a work vehicle.
In the fourth aspect of the present invention, the engine stopping means when leaving the seat is composed of a seat switch (91) which operates ON when the operator sits on the driver's seat (11) and turns OFF when the worker leaves the seat, and the engine when leaving the seat. The stop checking means is any of the first to third seat switches (91) configured by a combination of the seat switch (91) and the seat flip-up switch (92) that is turned on when the driver's seat (11) is in the inverted posture with the front fulcrum as the front fulcrum. This is the work vehicle of the present invention.
First invention relating to the present invention, when the power of the engine 5 is configured to transmit to the PTO output shaft 10 via the PTO clutch 43 and PTO transmission 42 and 45, the operator is unattended from the cockpit 11 A means for stopping the engine at the time of leaving the seat for controlling the stop of the engine 5, a means for setting the stationary PTO mode, and a stationary PTO switch 90 are provided, and the PTO clutch 43 is engaged by operating the stationary PTO switch 90 during the stationary PTO mode. In the work vehicle configured to operate sideways, the stationary PTO mode setting means include means for restraining the engine stop when leaving the seat and means for preventing PTO axis non-rotation with the PTO transmissions 42 and 45 as the entry side.

Second invention relating to the present invention, in the first invention relating to the present invention, PTO shaft anti-rotation prevention means, PTO transmission 42, 45 and means for checking whether a predetermined gear position , The configuration is such that confirmation is performed by the detection output of the PTO lever position detection sensor 27a of the PTO lever 27.

Third invention related to the present invention is the second invention relating to the present invention, PTO transmissions, PTO reciprocal to set PTO speed change device 45 and / or forward and reverse rotation performs height shift speed The clutch was 42.

A fourth invention relating to the present invention, in the first related to the present invention a third any one of the invention, the unattended when the engine stopping means is turned ON when the operator Zajo operate cockpit 11 away The seat switch 91 is turned off when the seat is seated, and the engine stop checking means when the seat is left is a combination of the seat switch 91 and the seat flip-up switch 92 that is turned on when the driver's seat 11 is in the inverted position with the front fulcrum. To do.

A fifth invention related to the present invention, the present invention invention the first related to the fourth any one, the notification operation the stationary PTO switch 90 during the initial operation for operating PTO clutch 43 containing the long press operation Therefore, a first notification means M1 is provided so that the PTO clutch 43 is turned off by operating the stationary PTO switch 90 while the PTO clutch 43 is engaged, and the stationary PTO drive is performed from the time when the PTO clutch 43 is turned on to the time when the PTO clutch 43 is turned off. A second notification means M2 is provided to perform notification during work.

According to the present invention, even if the operator intends to rotate the PTO output shaft 10 by turning on the stationary PTO switch 90, when the PTO transmission 45 is placed in the neutral position, the PTO clutch 43 is engaged. Even if it operates, the PTO output shaft 10 cannot rotate. Therefore, when the operator operates the PTO lever 27, the PTO output shaft 10 suddenly rotates at that moment, and the rotating parts of the stationary work device are driven. Although it is dangerous, by configuring the PTO non-rotation preventing means, the above-mentioned unexpected situation can be avoided by arranging the operation of the PTO lever 27 before the operation of the stationary PTO switch 90.
Further, according to the present invention, by providing the first notification means M1, by long-pressing the stationary PTO switch 90, the time management of the long-press switch operation during the initial operation of engaging the PTO hydraulic clutch 43 is notified. It is possible to operate the clutch reliably. Further, by providing the second notification means M2, the stationary PTO work state can be notified to the work assistant or the like, which leads to improvement of workability and safety.
When the first relating to the present invention According to the present invention, the operator by the ON operation of the stationary PTO switch 90 regardless of intended rotation of the PTO output shaft 10, PTO transmission 45 is placed in the neutral position If so, even if the PTO clutch 43 is activated, the PTO output shaft 10 cannot rotate. Therefore, when the operator operates the PTO lever 27, the PTO output shaft 10 suddenly rotates and is stationary. It is dangerous because each rotating part of the work device is driven, but by configuring the PTO non-rotation prevention means, the PTO lever 27 operation is arranged before the stationary PTO switch 90 operation to avoid the above unexpected situation. it can.

According to a fourth invention relating to the present invention, in addition to the effects of the first to third invention relating to the present invention, also the seat switch 91 is a is OFF, this sheet splashed by the intention of the operator at the same time When the switch 92 is turned on, the engine stop checking means when leaving the seat functions, and the clutch can be operated by operating the stationary PTO switch 90 when leaving the seat.

According to the present invention relating to the present invention, in addition to the effects of the first to fourth invention relating to the present invention, by providing the first notification unit M1, a stationary PTO switch 90 by long press operation It is possible to notify the time management of this long press switch operation during the initial operation in which the PTO hydraulic clutch 43 is engaged, and the clutch can be reliably operated. Further, by providing the second notification means M2, the stationary PTO work state can be notified to the work assistant or the like, which leads to improvement of workability and safety.

It is a side view of a tractor equipped with a work machine. It is a top view of a tractor. It is a power transmission diagram in the mission case of a tractor. It is a top view of a part of a mission case which shows the operation relation of a hydraulic continuously variable transmission mechanism. (A) A plan view of the hydraulic continuously variable transmission linked to the forward position, (b) a plan view of the hydraulic continuously variable transmission linked to the neutral position, and (c) the hydraulic continuously variable transmission in the reverse position. It is a top view of the interlocking state. It is a control block diagram. It is a flowchart. It is a flowchart. It is a time chart. (A) (b) (c) It is a perspective view which shows an example of the tractor provided with the 1st notification means. It is a perspective view which shows an example of the tractor provided with the 1st notification means. (A) (b) (c) It is a perspective view which added the throttle adjusting means. (A) is a perspective view showing an example of a tractor having both the first and second notifying means, and (b) (c) (d) is a diagram showing an example of a liquid crystal display. It is a perspective view which shows an example of the tractor which combined with the 1st and 2nd notification means.

Embodiments of the present invention will be described with reference to the drawings.

The tractor T is a work vehicle that works in a field or the like, and has left and right front wheels 2 and 2 provided as steering wheels and left and right rear wheels 3 and 3 provided as driving wheels. The engine 5 mounted in the bonnet 4 at the front portion of 1 and the power transmission device 6 and the like interposed between the left and right front wheels 2 and 2 and the left and right rear wheels 3 and 3 and the engine 5 are provided.

As shown in FIG. 3, the power transmission device 6 includes a hydraulic continuously variable transmission 7, an auxiliary transmission 8, and a front wheel speed-increasing switching mechanism 9. The power transmission device 6 appropriately shifts the power generated by the engine 5 by the hydraulic continuously variable transmission 7 and the auxiliary transmission 8 and transmits the power to the rear wheels 3 and 3. Further, the power transmission device 6 can transmit the power generated by the engine 5 and decelerated by the hydraulic continuously variable transmission 7 and the auxiliary transmission 8 to the front wheels 2 and 2 via the front wheel speed-up switching mechanism 9. It has become.

The tractor T switches between a four-wheel drive state in which the power of the engine 5 is transmitted to the left and right front wheels 2 and 2 and the left and right rear wheels 3 and 3 and a two-wheel drive state in which the power is transmitted to the left and right rear wheels 3 and 3. It is possible. Further, a working machine W such as a rotary can be mounted on the rear portion of the tractor body 1.

A cockpit 11 is provided in the center of the traveling vehicle body 1, and a steering handle 12 used for steering the front wheels 2 and 2 is arranged in front of the cockpit 11 on the upper end side of the handle post 13. Further, a clutch pedal 15, a brake pedal 16, and an accelerator pedal 17 are installed on the lower side of the handle post 13 and near the driver's feet. A throttle arm 18 is arranged below the right side of the steering wheel 12.

Further, the handle post 13 is provided with a forward / backward switching lever 20 that switches the traveling direction of the tractor 1 between forward and reverse. The forward / backward switching lever 20 is tilted to the front side when the tractor is moved forward, and is tilted to the rear side when the tractor T is moved backward, so that the traveling vehicle body 1 can be switched between forward and reverse movement by power from the engine 5. It is a thing.

Further, the forward / backward switching lever 20 has a neutral position between the forward position and the reverse position, and this neutral position is a position where the traveling vehicle body 1 can be prevented from moving forward or backward. It has become. In the forward / backward switching lever 20, the operation position (forward position, reverse position, neutral position) of the forward / backward switching lever 20 is detected by the forward / backward lever position detection sensor 21. That is, the forward / backward lever position detection sensor 21 detects the operating position of the forward / backward switching lever 20. The forward / backward lever position detection sensor 21 outputs the detection result to the controller C.

Further, on the left side of the driver's seat 11, a main shift lever 25 for performing operations related to shifting during traveling of the traveling vehicle body 1, an auxiliary shifting lever 26, and a PTO output for driving a work machine mounted on the rear portion of the traveling vehicle body 1 are provided. A PTO lever 27 for connecting and disconnecting the drive of the shaft 10 is arranged. The main speed change lever 25 is for shifting the hydraulic continuously variable transmission 7 from the 1st speed to the 8th speed. The auxiliary transmission lever 26 shifts the auxiliary transmission 8 to three speeds of low speed, medium speed, and high speed of the traveling vehicle body 1. The low speed and medium speed at which the auxiliary shift lever 26 shifts are in the working running speed range during work in the field, and the high speed at which the auxiliary shift lever 26 shifts is when moving between fields. It is in the road speed range where the vehicle travels on the road.

Further, on the right side of the driver's seat 11, a position lever 28 for adjusting the height of the working machine is arranged. By operating the position lever 28 back and forth, the lift arm 29 interlocked with the elevating cylinder described later is vertically rotated and interlocked, and the working machine W connected via the three-point link mechanism P is vertically interlocked.

Next, the power transmission device 6 in the mission case 30 constituting the traveling vehicle body 1 will be described with reference to FIG. The rotation of the output shaft of the engine 5 is transmitted to the input shaft 32 of the transmission case 30 via the main clutch 31 which is interrupted by the clutch pedal 15. The rotation of the input shaft 32 is accelerated by the speed increasing gears 33 and 34 and transmitted to the input shaft 35 of the hydraulic continuously variable transmission 7.

The hydraulic continuously variable transmission 7 (HST) is a hydrostatic continuously variable transmission, and is composed of a variable capacity hydraulic pump 36 and a fixed capacity hydraulic motor 37, and is formed of a movable swash plate 38 of the hydraulic pump 36. The rotation of the hydraulic motor 37 is changed by changing the inclination. The inclination of the movable swash plate 38 is changed by the hydraulic cylinder mechanism 40 that operates by detecting the movement of the main shift lever 25 and the forward / backward switching lever 20, and the rotation of the motor output shaft 37a of the hydraulic motor 37 is changed. The rotation speed of the pump output shaft 36a directly connected to the hydraulic pump 36 is the same as the rotation speed of the input shaft 35.

The rotation of the pump output shaft 36a is transmitted to the PTO intermediate shaft 44 via the PTO forward / reverse clutch 42 and the PTO hydraulic clutch 43, and further transmitted to the PTO output shaft 10 via the PTO transmission 45, and is transmitted to the outside of the mission case 30. It is taken out to drive a working machine W such as a rotary.

Further, the motor output shaft 37a of the hydraulic motor 37 drives the front and rear wheels 2 and 3 via the auxiliary transmission 8, and further drives the front wheels 2 from the auxiliary transmission 8 via the front wheel speed-up switching mechanism 9.

The HST 7 is changed by the main speed change lever 25. The main shift lever 25 is operably provided at the center of the base end portion, is lightly locked at a plurality of locations (for example, eight locations), and is rotatably supported so that the shift stages can be felt in a plurality of (for example, eight) stages. .. The rotation position of the main shift lever 25 is detected by the main shift lever position detection sensor 25a, and the detection result is output to the controller C.

Further, the tractor T to which the work machine W is connected can work in the field or travel on the road, but the appropriate speed range during traveling differs between the field and the road. There is. Therefore, when the traveling vehicle body 1 is traveling, the speed range is switched by operating the main shifting lever 25 and the auxiliary shifting lever 26 according to the traveling state such as the traveling place. That is, the speed range during traveling is switched by operating the main shift lever 25 and the auxiliary shift lever 26.

For example, when working in a field, the driver switches the main shift lever 25 to either 1st to 8th speed and switches the auxiliary shift lever 26 to low speed or medium speed according to the speed at the time of work. Switch to either.

The position of the main shift lever 25 is detected by the main shift lever position detection sensor 25a, and the position of the auxiliary shift lever 26 is detected by the auxiliary shift lever detection sensor 26a. The controller C switches the HST 7 to the shift stage selected by the main shift lever 25 by controlling the rod 40a of the hydraulic cylinder mechanism 40 according to the detection result from the main shift lever position detection sensor 25a.

The HST 7 is provided with a neutral holding mechanism 48 that holds the trunnion shaft 46 and the trunnion arm 47 connected to the movable swash plate 38 in a neutral position. The trunnion shaft 46, the trunnion arm 47, and the movable slop plate 38 are interlocked with each other, and the rotation angle (position) of the trunnion shaft 46 and the trunnion arm 47 and the inclination angle of the movable slop plate 38 change corresponding to each other. ..

The trunnion arm 47 can be displaced to a forward position (FIG. 5 (a)), a neutral position (FIG. 5 (b)), and a reverse position (FIG. 5 (c)). The HST 7 outputs the power of the engine 5 as a force for advancing the traveling vehicle body 1 when the trunnion arm 47 is located in the forward position, and outputs as a force for moving the traveling vehicle body 1 backward when the trunnion arm 47 is located in the reverse position. However, when the trunnion arm 47 is located in the neutral position, it is not output as a force for moving the traveling vehicle body 1 forward or backward.

The trunnion arm 47 is driven by the hydraulic cylinder mechanism 40. The hydraulic cylinder mechanism 40 is configured so that the moving speed of the trunnion arm 47 changes according to the operating speed of the hydraulic cylinder mechanism 40 that drives the trunnion arm 47. That is, the faster the operating speed of the hydraulic cylinder 40, the faster the moving speed of the trunnion arm 47. The hydraulic cylinder mechanism 40 is configured to supply hydraulic oil from a pump to one or the other of a double-acting cylinder portion via a control valve 49. The control valve 49 includes a pair of solenoids 49a and 49b, and one of them. The hydraulic cylinder mechanism 40 is operated on the extension side based on the pulse signal to the solenoid 49a of the above, and on the shortening side based on the pulse signal of the other solenoid 49b.

The neutral holding mechanism 48 has a configuration in which the cam plate 50 is fixed to the trunnion shaft 46 on the upper surface of the HST 7, and an appropriately urged roller 51 is pressed against the peripheral cam portion of the cam plate 50, and the peripheral edge of the cam plate 50 is pressed. The trunnion shaft 46 and the trunnion arm 47 are configured to return to the neutral position (shown in FIG. 5B) by urging the roller 51 to fall into the recess 50a of the cam portion.

One end of the trunnion arm 47 is rotatably connected to the cam plate 50, and the other end of the trunnion arm 47 is connected to the piston rod 40a of the hydraulic cylinder mechanism 40 via a link 52. Therefore, when the hydraulic cylinder mechanism 40 is expanded and contracted, the trunnion shaft 46 rotates via the link 52, the trunnion arm 47, and the cam plate 50 so that the HST 7 can be changed. Further, the HST 7 is provided with a trunnion arm angle sensor 47a for detecting the rotation angle of the trunnion shaft 46, that is, the trunnion arm 47.

As described above, in the forward / backward switching control and speed control by the HST 7, the position signal of the forward / backward switching lever 20 and the position signal of the main speed change lever 25 are input, and these input signals are integrated into a specified speed signal. Based on the calculation result of the controller C, a speed signal is output to the solenoids 49a and 49b of the control valve 49 to control the hydraulic cylinder mechanism 40 to the extension side or the shortening side, so that the trunnion arm 47, the trunnion shaft 46 and the movable tilt are tilted. The plate 38 is driven and controlled.

When a command signal on the forward side is output from the controller C and the movable swash plate 38 is driven to the forward side, the hydraulic oil discharged from the hydraulic pump 36 is sucked into the hydraulic motor 37 via the pipeline 53A, and then the hydraulic motor 37. The hydraulic oil discharged from the hydraulic pump is sucked into the hydraulic pump 36 via the pipe line 53B and circulates, so that the motor output shaft 37a interlocked with the hydraulic motor 37 rotates to the forward side. On the other hand, when the movable swash plate 38 is driven to the reverse side, the hydraulic oil discharged from the hydraulic pump 36 is sucked into the hydraulic motor 37 via the pipeline 53B, and the hydraulic oil and the pipeline 53A discharged from the hydraulic motor 37 are sucked into the hydraulic motor 37. After that, it is sucked into the hydraulic pump 36 and circulates. In this case, the motor output shaft 37a rotates to the reverse side. 54a and 54b are neutral valves for smoothing the oil pressure in the reflux side pipeline, 55a and 55b are replenishment throttle valves, and 56 are relief valves.

As described above, the PTO clutch engages when the mechanical PTO forward / reverse clutch 42 that switches from the neutral position to the forward rotation side or the reverse rotation side and the PTO switch 60 are turned on and the solenoid 61a of the PTO control valve 61 is excited. It is composed of a PTO hydraulic clutch 43. The PTO lever 27 controls the on / off operation of the PTO forward / reverse clutch 42 and the shift operation of the PTO transmission 45 having two high and low stages, and the shift pattern and shift guide configuration of the lever 27 are variously designed. For example, the PTO lever 27 is provided below the front side of the driver's seat 11 so as to be operable in the left-right direction, and is configured to be switched between a reverse reverse low speed position-neutral-normal rotation low speed-neutral-forward rotation high speed. Then, a PTO lever position detection sensor 27a capable of detecting each position is provided so that it can detect which shift position or the neutral position is, and the detection output is input to the controller C.

In the PTO hydraulic clutch 43, hydraulic oil is supplied to the hydraulic clutch piston 43a, and the clutch disc 43b is pressed against the fixed wall surface to engage the clutch 43. The PTO switch 60 is configured to be switched ON or OFF. When the PTO switch 60 is turned OFF, the solenoid 61a is degaussed, the hydraulic oil in the hydraulic clutch piston 43a is discharged, and the clutch is disengaged.

As shown in FIG. 7, the hydraulic system that supplies the hydraulic oil to the hydraulic cylinder mechanism 40 is a main pump 70 used for controlling the work machine W and running, and a sub pump that sends hydraulic oil for the HST 7 and the power steering 71. Has 72. Since the hydraulic oil of the hydraulic cylinder mechanism 40 that rotates the trunnion shaft 46 is supplied from the sub pump 72 to the control valve 49 for trunnion control, the operating pressure is stable. Further, the hydraulic oil from the sub pump 72 is supplied to the power steering 71 and then supplied to the HST 7 through the relief valve 73 and the oil cooler 74.

Further, the hydraulic oil from the main pump 70 adjusts the oil pressure by the main relief valve 75 to control the main clutch 31 through the traveling valve 76, and also controls the left and right brake cylinders 79L and 79R through the brake valve 78. The diverted hydraulic oil is sent to the control related to the work machine W.

The hydraulic oil for the working machine W is sent to the horizontal cylinder 81 and the elevating cylinder 82 by the flow dividing valve 80. The horizontal cylinder 81 is controlled by the horizontal valve 83, the elevating cylinder 82 is controlled by the electro-hydraulic valve 84 and the slow return check valve 85, and the hydraulic oil is returned into the mission case 30 through the safety relief valve 86.

Next, the stationary PTO device will be described. The stationary PTO device is provided to drive a stationary work machine such as a water pump by power from the PTO output shaft 10 of the work vehicle. The PTO hydraulic clutch 43 can be turned on by turning on the stationary PTO switch 90, provided that the stationary PTO mode is set.

First, when the operator is provided with a seat switch 91 that switches on by weight against the cushion member when the operator sits on the driver's seat 11, the seat switch 91 is OFF, and the driver's seat 11 is in the inverted posture with the front fulcrum. The seat flip-up switch 92 that turns on is a condition of turning on. That is, the ON operation of the seat switch 91 is to start the engine by the key switch 93 and stop the engine when leaving the seat (means for stopping the engine when leaving the seat), but in the case of the stationary PTO device, the operator uses it in the state of leaving the seat. Therefore, even if the seat switch 91 is turned off, if the seat flip-up switch 92 intentionally turned on by the operator is turned on at the same time, the controller C functions as an engine stop checking means when leaving the seat. Recognize that it is. And it outputs so that the engine drive can be continued even if the seat is left.

Further, the controller C functions as a stationary PTO work safety means when the forward / backward switching lever position detection switch 21 indicates a neutral position and the parking lever switch 94 which is turned on when the parking lever is braked and turned off when the parking lever is not braked is turned on. Recognize that you are doing.

Further, when the shift position of the PTO lever 27 is an appropriate shift position other than the neutral position, the PTO non-rotation prevention means of the present invention functions. The PTO axis non-rotation preventing means serves as a means for confirming whether or not the PTO forward / reverse clutch 42 or the PTO transmission 45 is in a predetermined shift position, and determines which of the shift positions and the neutral positions of the PTO lever 27 is. A PTO lever position detection sensor 27a that can detect is provided. Then, when the neutral position is detected, the operation output for entering the PTO hydraulic clutch 43 is not generated, and the operation output for entering the PTO hydraulic clutch 43 is generated by any of the shift position outputs.

Here, the purpose of providing the PTO non-rotation prevention means is as follows. When the PTO lever 27 is placed in the neutral position, even if the PTO hydraulic clutch 43 is turned on, the operator does not intend to rotate the PTO output shaft 10 by turning on the stationary PTO switch 90. If the PTO forward / reverse clutch 42 is in the neutral position or the PTO transmission 45 is in the neutral position, the PTO output shaft 10 cannot rotate. Therefore, the operator knows that the PTO lever 27 needs to be operated, but since the stationary PTO switch 90 is already in the ON state, the PTO output shaft 10 suddenly rotates at the moment when the PTO lever 27 is operated, and the stationary work is performed. There is a risk that each rotating part of the device will be driven, which may lead to danger. Therefore, by configuring the PTO non-rotation preventing means, the above-mentioned unexpected situation can be avoided by arranging the operation of the PTO lever 27 before the operation of the stationary PTO switch 90.

The procedure after setting the stationary PTO mode will be described with reference to FIG. The stationary PTO mode is set as described above, and the engine 5 is started by turning on the key switch 93 (S101 to S103). Next, the stationary PTO switch 90 is turned on (S104). Here, the stationary PTO switch 90 is arranged on the rear side surface of the left fender 95 of the left and right fenders, and its form employs a so-called momentary operation method in which the ON state is continuously turned off during the switch pressing operation and the switch is turned OFF. Then, when the controller C recognizes a preset long press operation from the stationary PTO switch 90, for example, ON continuation for a predetermined time t (for example, 3 seconds), the controller C operates the PTO control valve 61 of the PTO hydraulic clutch 43. It is configured to excite 61a (S104 to S108). After that, even if the stationary PTO switch 90 is turned off, the excitation signal of the PTO control valve solenoid 61a continues and the PTO hydraulic clutch 43 continues to engage (S110 to 112). When the work by the stationary work apparatus is completed, the controller C outputs a demagnetization command signal to the PTO control valve solenoid 61a and the PTO hydraulic clutch 43 is disengaged by turning on the stationary PTO switch 90 (S113 to S115).

By the way, the time chart of the stationary PTO switch 90, the PTO control valve solenoid 61a, and the PTO hydraulic clutch 43 is shown in FIG. Then, during the initial operation for engaging the PTO hydraulic clutch 43 by the stationary PTO switch 90 (hereinafter, "initial operation", corresponding to the S102 to S109), the first notification means M1 is configured, and the PTO hydraulic clutch 43 is formed. The second notification means M2 is configured during the period from when the clutch is turned on to when the clutch is turned off (hereinafter, “during the stationary PTO driving work”, which corresponds to the above S109 to S115).

First, a specific configuration of the first notification means M1 will be described. A speaker 96 is arranged in the vicinity of the stationary PTO switch 90 as a notification means (FIG. 10 (a)), and outputs such as "PTO will turn soon" are output during the initial operation. If the controller C cannot recognize the stationary PTO mode setting even during the initial operation, the cause is determined and an output such as "the parking brake is not applied" is output. Further, three lamps 97a, 97b, 97c are provided in the vicinity of the stationary PTO switch 90 ((b) in the figure), and when the stationary PTO switch 90 is pressed and held for 3 seconds, the lamp 97a lights up in 1 second. Then, the lamp 97b lights up in 2 seconds, and all the lamps 97a, 97b, 97c light up when the long press for 3 seconds is completed. A buzzer 98 is provided to notify the user when the predetermined time t during the initial operation elapses by receiving a buzzer output, or to notify when the PTO hydraulic clutch 43 is engaged after the initial operation. In the latter case, it is preferable to provide a PTO rotation detection sensor 99 that detects the rotation of the PTO output shaft 10 as a means for detecting the engagement of the PTO hydraulic clutch 43. The buzzer 98 may be provided with a configuration in which a warning notification is given by changing the tone color such as an intermittent sound. For example, a warning is given when the stationary PTO mode setting cannot be recognized. Further, the warning sound pattern may be changed to correspond to various stationary PTO modes.

During the initial operation, the left and right winkers 100L and 100R or the winkers 100L on the side where the stationary PTO switch 90 is arranged are turned on (FIG. 10 (c)). Further, as a usage pattern of the winker 100, it can be indicated by lighting the winker that various preparations in the stationary PTO mode setting have been completed. A buzzer 98 may be used in combination with the mode setting completion notification.

By providing the first notification means M1, by long-pressing the stationary PTO switch 90, it is possible to notify the time management of this long-press switch operation during the initial operation of engaging the PTO hydraulic clutch 43, which is reliable. The clutch can be activated.

Next, a specific example of the second notification means M2 will be described. A pilot lamp 101 is provided in the vicinity of the stationary PTO switch 90, and is configured to light up and display during the stationary PTO driving operation (FIG. 11). The blinking of the winker 100 and the lighting and blinking of the buzzer 98 may be used together. By providing the second notification means M2 in this way, the stationary PTO work state can be notified to the stationary work assistant or the like, which leads to improvement in workability and safety.

In FIG. 12, a throttle adjusting means 102 is provided in the vicinity of the stationary PTO switch 90. Instead of the throttle lever 18, the throttle adjusting means 102 has a configuration in which an operator who has left the cockpit 11 can operate the throttle from outside the machine in the same manner as the stationary PTO switch 90. As shown in FIG. 12A, the throttle adjusting means 102 is configured such that the engine controller E connected to the controller C inputs the internal potentiometer output in the form of the throttle dial 102a to control the fuel injection amount. Instead of the throttle dial 102a form, as shown in Fig. (B), a parallel switch 102b with a momentary operation method that can swing up and down is adopted, and fuel is used in the upper switch section according to the ON time of each upper and lower switch section. The supply amount may be increased and the fuel supply amount may be decreased in the lower switch portion. By providing the throttle adjusting means 102, the engine rotation can be adjusted, and by extension, the rotation speed of the rotating portion of the stationary work machine can be adjusted from outside the machine. The adjustment operation by the throttle adjusting means 102 is conditioned on the condition that the PTO hydraulic clutch 43 by the stationary PTO switch 90 is engaged and operated, and the controller C invalidates the adjustment by the throttle adjusting means 102 if this condition is not met. Further, in the case of the above-mentioned parallel switch of the momentary operation method, a switch of the momentary operation method can be added by configuring the central portion to be pressed, and this additional momentary switch can be replaced with the stationary PTO switch 90. (Fig. (C)).

An example in which both the first notification means M1 and the second notification means M2 are provided will be described. A liquid crystal display unit 103 is provided in the vicinity of the stationary PTO switch 90 (FIG. 13 (a)). During the initial operation, the liquid crystal display unit 103 sequentially displays three bar graphs having different heights as 1 second, 2 seconds, and 3 seconds (FIG. (B)). While the PTO hydraulic clutch 43 is operating, a schematic diagram of the PTO and the current rotation speed are displayed (Fig. (C)), and the cause can be displayed together with the target location (Fig. (D)). .. Note that FIG. 3D shows an example in which the controller C detects and inputs the non-operating state of the parking lever switch 94 and recognizes that the stationary PTO work safety means is not functioning. Further, a configuration may be added in which a buzzer is notified each time the display is switched to prompt the operator to confirm.

Further, the example shown in FIG. 14 is provided with a 7-segment display 104, and displays 7 segments of “1” → “2” → “3” for each elapsed time during the initial operation. Further, when the condition of the stationary PTO mode setting is satisfied, "0" is displayed, and when the condition is not satisfied, "E" is displayed. A buzzer is used for each display to prompt the operator to confirm.

5 Engine 10 PTO output shaft 11 Driver's seat 27 PTO lever 27a PTO lever position detection sensor 42 PTO forward / reverse clutch (PTO transmission)
43 PTO clutch 45 PTO transmission (PTO transmission)
90 Stationary PTO switch 91 Seat switch 92 Seat flip-up switch M1 First notification means M2 Second notification means

Claims (4)

The power of the engine (5) is configured to be transmitted to the PTO output shaft (10) via the PTO clutch (43) and the PTO transmission (42, 45), and when the operator leaves the driver's seat (11), the above-mentioned A means for stopping the engine (5) at the time of leaving the seat, a means for setting the stationary PTO mode, and a stationary PTO switch (90) are provided, and the stationary PTO switch (90) is operated during the stationary PTO mode. Thereby, in the work vehicle configured to operate the PTO clutch (43) on the entry side, the stationary PTO mode setting means includes a means for restraining the engine stop when leaving the seat and the PTO transmission (42, 45). ) constitutes the PTO shaft anti-rotation prevention means capable of detecting that the shift position,
A first notification means (M1) is provided to perform a notification operation during the initial operation of operating the PTO clutch (43) by pressing and holding the stationary PTO switch (90), and the PTO clutch (43) is engaged during the operation. The configuration is such that the PTO clutch (43) is turned off by operating the stationary PTO switch (90), and the second is to perform a notification operation during the stationary PTO driving work from the time when the PTO clutch (43) is turned on to the time when the PTO clutch (43) is turned off. A work vehicle characterized by providing a notification means (M2). The PTO axis non-rotation preventing means serves as a means for confirming whether or not the PTO transmission (42, 45) is in a predetermined shift position, and is a detection output of the PTO lever position detection sensor (27a) of the PTO lever (27). The work vehicle according to claim 1, which is configured to be confirmed by. The work vehicle according to claim 2, wherein the PTO transmission is a PTO transmission (45) that performs high and low rotation speeds and / or a PTO forward / reverse clutch (42) that sets forward / reverse rotation. The engine stop means when leaving the seat is composed of a seat switch (91) which operates ON when the operator sits on the driver's seat (11) and turns OFF when the worker leaves the seat, and the engine stop checking means when leaving the seat is the seat switch. The method according to any one of claims 1 to 3, which is configured by a combination of (91) and a seat flip-up switch (92) that operates ON when the driver's seat (11) is in the inverted position with the front fulcrum as the fulcrum. Work vehicle.

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