JPH0788142B2 - Control device for work vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control device applied to a work vehicle in which a PTO output for driving an external device can be taken out.

(Background of the Invention) There is a working vehicle in which a PTO (Power Take Off) output is taken out from a running engine to allow driving while driving an external device such as a lawn mower, a sprayer, a cultivator, and a pump. In this type of vehicle, it is desirable that the PTO output shaft be securely connected to an external device so that the vehicle body can start after the driver sits on the seat. Therefore, when the traveling clutch is engaged in the PTO mode, it is proposed that the vehicle can travel only when the driver is seated on the driving seat (Japanese Patent Laid-Open No. 60-169332).
issue).

However, in this case, when the driver lifts his / her hip from the driver's seat while traveling in PTO mode, or when he / she shifts his / her weight largely to check backward, etc., it may be judged that the driver is not riding, and the engine stops. As a result, traveling and operation of external equipment are restricted. For this reason, there is a problem in that the driver's posture is greatly restricted during driving in the PTO mode, and the driver is easily mentally tired.

Especially for vehicles with a straddle-type driving seat that have a PTO output shaft below and behind this driving seat, the work equipment connected to the PTO output shaft is behind the driver, In order to check the differential status of the equipment, it is necessary to lift the hip from the driving seat. However, the conventional device has a disadvantage that the engine is stopped at this time. Also, it was not possible to drive only the PTO shaft and continue to drive pumps etc. without stopping the vehicle.

(Object of the Invention) The present invention has been made in view of such circumstances.
In PTO mode, when the driver is not in the vehicle, the vehicle is basically restricted from traveling, while the driver is located below and behind the driver's seat.
In order to confirm the work equipment that is driven by the PTO output shaft, when the driver temporarily suspends his / her waist or shifts his / her weight significantly while driving, it is possible that the driver is temporarily judged not to be in the vehicle. It is an object of the present invention to provide a control device for a working vehicle that allows a driver to drive with comfort without fear that the operation of an external device will be restricted even if it is emitted.

(Structure of the Invention) According to the invention, an object of the present invention is to provide a straddle-type operation seat, a PTO output shaft located below and behind the operation seat, and a steering handlebar, and to output the output of the running engine to the outside. In a work vehicle in which a driving clutch and a main transmission are interposed in a driving behavior system that transmits the driving output to the driving wheels, the PTO output for driving the device and the driving output can be taken out separately. A manual clutch lever for traveling that is attached to a bar to connect and disconnect the operating clutch, a PTO transmission system that bypasses the traveling clutch and the main transmission and transmits the output of the engine to a PTO output shaft, and this PTO transmission system Detects the PTO mode by connecting this PTO clutch and the PTO clutch that is interposed and connected by a manual switching lever.
PTO detector, a boarding detector provided on the driver's seat to detect the seating of the driver, a clutch detector to detect the discontinuity of the traveling clutch, and the PTO mode and the driver's non-seated state for the traveling A control device for a working vehicle, comprising: a discriminator that discriminates that a clutch is connected and outputs a traveling limitation signal, and traveling limitation means that regulates traveling of the vehicle based on the traveling limitation signal. Achieved by.

(Embodiment) FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a side view of a vehicle to which this embodiment is applied, FIG. 3 is a perspective view of a power unit thereof, and FIG. FIG.

In FIG. 2, the work vehicle 10 has two steering front wheels 12 and two driving rear wheels 14. Wide ultra-low pressure tires (so-called balloon tires) are mounted on the front wheels 12 and the rear wheels 14. An engine 16 is mounted near the center of the vehicle body. A steering handlebar 18 is arranged above the front wheels 12,
A fuel tank 20 and a straddle-type operation seat 22 are sequentially arranged behind the handlebar 18. This driving seat
A seat switch 24 as a boarding detector that detects the seating of the driver and outputs a signal "H" is attached to the seat 22.

As shown in FIG. 4, the engine 16 controls the rotation of the crankshaft 26 by controlling the traveling manual clutch 28, the multi-stage transmission 30 and the bevel gears.
It is configured to transmit to the output shaft 34 via 32. The rotation of the output shaft 34 is transmitted to the final reduction gear device 40 provided on the rear wheel shaft 38 by the drive shaft 36 (Fig. 3). The manual clutch 28 is disengaged by a clutch lever 18a attached to the right side of the handlebar 18.

Further, the engine 16 is equipped with a PTO output takeout mechanism 42. The mechanism 42 includes gears 44 and 46 driven by the crankshaft 24 via the gear 28a of the clutch 28 and a gear 46.
A shaft 48 that rotatably supports the shaft 48, a slider 52 that is splined to the shaft 48 to form a dog clutch 50 together with the gear 46, a mechanical centrifugal governor 54 that is provided on the shaft 48, and a shaft 48.
The bevel gear 56 is provided for transmitting the rotation of the shaft 55 to the shaft 55. Here, the dog clutch 50 forms a PTO clutch that connects and disconnects the PTO transmission system by a manual switching lever 62 described later. Axis 5
The rotation of 5 is transmitted to the PTO output shaft 60 via the drive shaft 58. The PTO output shaft 60 is supported by the case of the final reduction gear unit 40 as shown in FIG.

A manual switching lever 62 is provided on the right side surface of the engine 16. A switching shaft 64 is provided at the rear of the engine 16, and a lever 66 fixed to the upper end of the switching shaft 64 and the lever 62 are connected by a link 68. Another lever 70 (FIG. 4) is fixed to the switching shaft 64, and the rotating end of this lever 70 is engaged with a fork 72 for moving the slider 52. Therefore, if the switch lever 62 is tilted forward (direction of travel)
In the PTO mode, the cutting shaft 64 rotates counterclockwise in FIG. 4, the fork 72 and the slider 52 move to the left, and the dog clutch 50 meshes. Therefore, the rotation of the crankshaft 26 is caused by the gears 28a, 44, 46, the slider 52, the shaft 48, the bevel gear 56, the shaft 55,
It is transmitted to the PTO output shaft 60 via the drive shaft 58. On the contrary, if you switch the switching lever 62 backward,
The dog clutch 50 is disengaged and the PTO output shaft 60 is stopped.

As shown in FIG. 4, the governor 54 includes a disc 74 integral with the slider 52, a weight cone 76 supported by the disc 74, and a slider 78 slidably held by the shaft 48. . Slider
The lever 80 abuts against the 78, and together with this lever 80, the lever 82
Rotates.

In FIG. 3, reference numeral 84 denotes a carburetor, and the carburetor 84 is selectively interlocked with a traveling throttle lever 86 provided on the handlebar 18 and a lever 82 of the governor 54 according to the operation of the switching lever 62. That is, in the PTO mode in which the switching lever 62 is tilted forward, the carburetor 84 interlocks with the governor 54 to control the engine 16 at a constant speed. In the traveling mode in which the switching lever 62 is tilted backward, the carburetor 84 is controlled by the throttle lever 86,
The vehicle runs at a speed according to the operation amount of the throttle lever 86.

Reference numeral 90 denotes a PTO detector, which is composed of a switch that is opened and closed by the movement of the fork 72, is turned on in the PTO mode, and outputs an "H" level signal c (see FIG. 1).

In FIG. 1, reference numeral 92 is an ignition circuit, for example, a CDI type circuit is used. This ignition circuit 92 is a capacitor charged to the polarity shown in FIG.
96 and the capacitor 96 which is ignited by the pulsar coil 98
And a thyristor 102 that discharges the charged electric charge of the electric charge through the primary side of the ignition coil 100.

Reference numeral 104 denotes a travel restricting means, which is composed of a normally closed switch 104a interposed between the pulsar coil 98 of the ignition circuit 92 and the gate of the thyristor 102. The switch 104a opens when the output of the AND circuit 104 described later becomes the "H" level, stops the ignition of the spark plug 106, and stops the engine 16.

Reference numeral 108 denotes a clutch detector, which outputs an "H" level signal b when the clutch lever 18a is gripped and the clutch 28 is disengaged.

110 is an AND circuit as a discriminator, which is a signal obtained by inverting the output of the seat switch 24 by an inverter circuit 112, a signal b of the clutch detector 108, and a signal c of the PTO detector.
And have been entered.

Therefore, the AND circuit 110 is in the PTO mode (signal c is "H"), the clutch 28 is engaged (signal b "H"), and the seat switch 24 is off (non-ride signal a is "H"). For example, the AND circuit 110 outputs the travel restriction signal d of "H", and the engine 16 is stopped, that is, the vehicle body does not travel when the clutch is engaged in the PTO mode and the vehicle is not in the vehicle.
If the clutch 27 is disengaged during traveling in the O mode, the signal b becomes "L". Therefore, the travel restriction signal d, which is the output of the AND circuit 110, becomes "L" regardless of whether the seat switch 24 is on or off, and the engine 16 continues to operate without stopping. At this time, the vehicle body will decelerate or stop running, but the PTO output shaft 60 will continue to rotate, and external equipment connected to it will continue to be driven. That is, if the clutch lever 18a is continuously gripped or a lock device for fixing the lever 18a to this position is provided, the external device can be driven while the vehicle is stopped and the passenger is not riding.

FIG. 5 is a circuit diagram of another embodiment. In this example,
The clutch detector 108A includes a switch 108a which is turned on when the clutch is connected, and a transistor 108b which is turned on and off by the switch 108a, and the signal b becomes "H" when the clutch is connected. This signal b is input to the travel limiting means 104A composed of the constant voltage diode 114 and the NPN transistor 116. That is, the signal b is input to the base of the transistor 116 via the diode 114. The collector of the transistor 116 is connected to the positive electrode of the power supply and the output end of the charging coil 94.

A PTO detector 90 is connected between the anode of diode 114 and ground.
A and the boarding detector 118 are connected in parallel. PTO detector 9
0A consists of a switch that turns off in PTO mode. The boarding detector 118 includes an NPN transistor 120 and a seat switch 24A that is connected to the sitter of the transistor 120 and is turned on when boarding. The transistor 120 is always turned on, and its collector is connected to the positive electrode of the power source and the diode 11
4 connected to the anode.

Therefore, when the clutch 28 is connected, the signal b is "H", and at this time PT
In O mode, the PTO detector 90A is turned off, but in the case of boarding, the diode via the transistor 120 and seat switch 24A
The point A on the anode side of 114 is grounded. Therefore, the transistor 116 is turned off and the engine 16 can be ignited. If the passenger is not in the vehicle, the seat switch 24A is turned off, and the point A is not grounded by the passenger detector 118. Therefore, when the clutch 28 is engaged, the signal b becomes "H" and the transistor
116 is turned on, and the output end of the charging coil 94 is grounded via the transistor 116. Therefore, the engine 16 is stopped, but when the clutch 28 is disengaged, the signal b becomes "L", and the transistor 116 is turned off regardless of whether the vehicle is in the riding / non-riding or PTO mode.
Is driven. That is, in this embodiment, the signal b including point A
The same passage forms the discriminator 110A.

As is clear from the above description, when the user lifts his / her hip from the driving seat 22 while traveling in the PTO mode (the clutch 28 is connected), the seat switch 24A is turned off and the engine 16 is stopped, but at this time, the clutch 28 is disengaged. If so, the operation of the engine 16 can be continued regardless of whether the seat switch 24A is turned on or off. Therefore, in order to confirm the operating status of the work equipment driven by the PTO output shaft 60, the operation seat 22
Even if the user lifts his / her waist from above, the engine 16 does not stop as long as the clutch lever 18a is grasped, and the PTO output shaft rotates to easily confirm the working equipment. At this time, since the driver is gripping the handlebar 18, the driving posture does not become unstable.

In the above embodiments, the travel limiting means 104, 104A are the ignition circuit 9
Although 2 is configured to be misfired, the present invention is not limited to this, and braking may be applied or the traveling clutch may be disengaged.

When the driving seat 22 is particularly long in the front-rear direction, the operation of the seat switches 24, 24A tends to be inaccurate depending on the seating position of the driver. Therefore, as shown in Fig. 2, at least PT
In the O mode, a movable backrest B protruding upward is provided, and the PTO
It is desirable to regulate the seating position in the mode to the optimum position for the operation of the seat switch 24. In addition, this back B is PTO
It is desirable that it can be projected and stored in conjunction with the mode switching, but it may be one that can be operated manually.

(Effects of the Invention) As described above, the present invention is configured to operate the travel restricting means by determining that the manual clutch is connected in the PTO mode and the non-ride state, so that the operation is performed in the PTO mode. Even if you are temporarily lifted from the seat and it is temporarily judged that you are not riding, you can continue to operate the external device by disengaging the manual clutch and temporarily disengage the clutch when moving your body. So you can drive with ease. Therefore, especially when the PTO output shaft is located below and behind the straddle-type driving seat, the operating condition of the external device can be easily confirmed by lifting the waist from the driving seat. At this time, since the driver is holding the traveling handlebar, the posture does not become unstable.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a side view of a vehicle to which this embodiment is applied, FIG. 3 is a perspective view of a power unit thereof, and FIG. 4 is a cross-sectional view near the governor. FIG. 5 is a circuit diagram of another embodiment of the present invention. 16 …… Engine, 18 …… Steering handlebar, 18a …… Traveling manual clutch, 22 …… Straddle-type driving seat, 28 …… Traveling clutch, 50 …… Dog clutch as PTO clutch, 60 …… PTO output shaft, 62 …… switching lever, 90,90A …… PTO detector, 104,104A …… travel limiter, 108 …… clutch detector, 110 …… and circuit as discriminator, 110A …… discriminator.

Claims (1)

[Claims] 1. A straddle-type operation seat, a PTO output shaft located below and behind the operation seat, and a steering handlebar are provided, and the output of the running engine is combined with the PTO output for driving an external device. In a working vehicle in which a traveling clutch and a main transmission are interposed in a traveling behavior system that transmits the traveling output to the drive wheels, the traveling clutch is attached to the steering handlebar. The output of the engine is bypassed by bypassing the running manual clutch lever, the running clutch, and the main transmission.
A PTO transmission system that transmits to the PTO output shaft, and a PTO clutch that is interposed in this PTO transmission system and is discontinued by a manual switching lever,
PTO that detects PTO mode by connecting this PTO clutch
A detector, a boarding detector provided on the driver's seat for detecting the seating of the driver, a clutch detector for detecting the discontinuity of the traveling clutch, and the traveling clutch in the PTO mode and the driver's non-seated state. A control device for a working vehicle, comprising: a discriminator that discriminates that the vehicle is connected and outputs a traveling restriction signal, and traveling restriction means that restricts traveling of the vehicle based on the traveling restriction signal.