JPH09201106A - Farm tractor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce fatigue of an operator and fuel consuming amount of an engine by automatically controlling the rotation of the engine at a low speed and reducing noise. SOLUTION: This farm tractor has a working machine having an output control member 30 controlling the rotation of an engine 5 according to an operation of a hand accelerating lever 28 or a foot accelerating pedal 29, both of which are driven by the engine 5. The tractor also has a controller 38 automatically controlling the output control member 30 to give a prescribed rotation number of the engine 5 prescribed by the hand accelerating lever 28 when driving the working machine and to give a prescribed rotating number of the engine 5 prescribed by the foot accelerating pedal 29 when stopping the working machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural tractor equipped with a front loader for carrying compost or earth and sand or a tiller for cultivating a field.

[0002]

Conventionally, Japanese Patent Publication No. 7-10
As disclosed in Japanese Patent No. 8627, constant rotation speed control is performed by a hand accelerator lever. For example, when a loader is attached to a tractor, the hand accelerator lever is kept at a high-speed rotation position to move the bucket up and down and keep the bucket constant. Since the tractor was run while being supported at a height to carry compost or earth and sand, the engine will rotate at high speed even when the tractor is running at a low load, as well as when the tractor is running at a high load, and noise and fuel consumption will be increased. Could not be easily reduced.

[0003]

SUMMARY OF THE INVENTION Therefore, the present invention provides an agricultural tractor in which an output control member for controlling engine rotation based on a hand accelerator lever or foot accelerator pedal operation is provided and a working machine driven by the engine is installed. The output control member so that the engine has a set rotation speed of the hand accelerator lever by an operation of driving the work machine, and the engine has a set rotation speed of the foot accelerator pedal by an operation of stopping the work machine. By providing a controller for automatic control of, the engine is rotated at a high speed by an operation of driving the working machine, and the engine is rotated at a low speed by an operation of stopping the working machine. It can reduce noise and reduce operator fatigue. It is capable of easily reducing the fuel consumption of the engine.

Further, an operator is provided with an automatic changeover switch which is turned on and off by a manual operation, and when the automatic changeover switch is turned on by detecting a work lever stop operation for driving the work machine, the engine rotation deceleration operation by the output control member is automatically performed. The automatic switching is performed, for example, when the traveling road surface of the tractor has a large traveling load due to soft mud or an ascending slope and when the traveling road surface of the tractor is hard and the traveling load is small. By switching the switch, it is possible to eliminate the problem that the engine rotation is reduced when the traveling load is large and the engine stops due to a negative load.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a control circuit diagram, FIG. 2 is a side view of the whole, and FIG. 3 is a flowchart of FIG.
Is a traveling tractor, (2) and (3) are front and rear wheels of the tractor (1), (4) is a chassis that is a machine base on which the front wheels (2) are mounted, and (5) is the chassis (4). An engine to be mounted, (6) a power transmission case that is connected to the engine (5) and is equipped with rear wheels (3), (7) a driver's seat attached to the upper rear surface of the case (6), (8) ) Is a steering handle, and a bucket (10) that is an attachment of a front loader (9) that is a working machine is installed in front of the tractor (1) via a pair of left and right booms (11). Further, in the figure, (12) is a rear mounting frame that supports the boom (11), and (13) is a rear mounting frame (1
2) Horizontal mounting frame with rear end integrally connected to (2), (1
Reference numeral 4) is a front mounting frame integrally connected to the front end side of the horizontal mounting frame (13).
3) The rear mounting frame (12) is formed on the base stand (15) fixed to the lower surface of the power transmission case (6) through the rear mounting stand (16) while the (14) is formed in a gate shape in side view. Installed on the front end side of the chassis (4).
The front attachment frame (14) is erected via 7), and the gate-shaped frames (12), (13) and (14) are installed symmetrically on both sides of the bonnet (18) covering the engine (5). .

Further, the base end of the boom (11) is connected to and supported by the upper end of the front mounting frame (12) through a pivot fulcrum pin (19), and the frame (12) and the boom (11) are supported. A hydraulic loader lift cylinder (21) is interposed between the intermediate fixed locking plate (20) and the boom (11) is lifted and lowered by the expansion and contraction operation of the cylinder (21).

Further, the base ends of the dump cylinder (24) and the dump arm (25) are supported by fixing brackets (22) and (23) between the middle and front ends of the boom (11), and these cylinders (24) and The tips of the arms (25) are connected to each other, and the tips of the arms (29) are connected to the dump links (26) at the upper rear end of the bucket (10).
Are connected via. And the bucket (10)
The lower end of the rear part is supported by the front end of the boom (11) through the hook arm (27), and the dump cylinder (2
The inclination of the bucket (10) is changed by the expansion / contraction operation of 4).

Further, a hand accelerator lever (28) manually operated by an operator sitting on the driver's seat (7) and a foot accelerator pedal (29) operated by the operator's foot.
Is provided on the tractor (9), the lever (28)
When the lever (28) is supported at the operated position even when the hand is removed from the pedal, the pedal (29) is automatically returned to the low rotation (idle rotation) position by the spring force by releasing the foot from the pedal (29). It is configured to do.

Further, an electronic governor (30), which is an output control member for controlling rotation by increasing / decreasing the fuel supplied to the engine (5) based on the operation of the lever (28) or the pedal (29), is provided to the bonnet (18). To be installed internally,
The electronic governor (30) is formed so that a rack gear is driven by an electromagnetic solenoid or an electric motor (not shown) to increase or decrease the fuel supplied to the engine (5) to accelerate or decelerate the rotation of the engine (5). There is.

Further, a bucket lever (31), which is a work lever for the operator of the driver's seat (7) to tilt forward and backward and left and right by hand, is provided on the side of the driver's seat (7). ) The hydraulic valve (not shown) is switched by tilting back and forth to extend and retract the lifting cylinder (21) to move the bucket (10) up and down, and the hydraulic valve (not shown) is switched by tilting the bucket lever (31) left and right. The dump cylinder (24) is expanded and contracted to scoop compost or earth and sand with the bucket (10), and the compost or earth and sand of the bucket (10) is dropped downward. Incidentally, when the bucket lever (31) is released, the bucket lever (31) is automatically returned to the neutral position where it is in a substantially upright posture by a spring force.

In FIG. 2, (32) is a top link, and (33) is a lower link, and a rotary tiller for cultivating a field can be lifted and lowered through the links (32) and (33). Set up.

Further, as shown in FIG. 1, a rotation sensor (34) for detecting the rotation speed of the engine (5) and a set rotation speed (operation amount) of the hand accelerator lever (28).
And a potentiometer-type hand accelerator sensor (36) for detecting the set rotational speed (operation amount) of the foot accelerator pedal (29), and an automatic operator manually turning on and off the potentiometer-type foot accelerator sensor (36). The loader output raising switch (37) which is a changeover switch and the electronic governor (30) are connected to an electronic governor controller (38) formed by a microcomputer.

Further, a raising switch (39) and a lowering switch (40) for operating the lifting cylinder (21) by tilting the bucket lever (31) forward and backward, and a dump cylinder (24) by tilting the bucket lever (31) left and right. ), A scooping switch (41) and a dropping switch (42), and raising and lowering switches (39) (4).
0) and the up and down solenoids (43a) (43) that switch the hydraulic valve of the up and down cylinder (21) by exciting it.
b) and the scooping and dropping solenoids (44a) (44b) that are excited by the scooping and dropping switches (41) (42) to switch the hydraulic valve of the dump cylinder (24).
It is connected to a loader controller (45) formed by a microcomputer.

The electronic governor controller (3
8) and the loader controller (45) are connected to each other for input / output, and when the loader output raising switch (37) is turned on, any of the switches (39) to (42) is operated by operating the bucket lever (31). Is turned on, the electronic governor (30) is controlled based on the hand accelerator sensor (35), while the bucket lever (3) is controlled.
1) is in the neutral position and each switch (39) ~
When both (42) are off, the electronic governor (30) is controlled based on the foot accelerator sensor (36), and the engine (5) is driven by the operation of driving the front loader (9) which is a working machine. The engine (5) is operated by the operation of stopping the front loader (9) so that the set rotation speed of the hand accelerator lever (28) is achieved.
The electronic governor controller (38) for automatically controlling the electronic governor (30) as an output control member is provided so that the number of revolutions of the foot accelerator pedal (29) becomes the set rotational speed, and the operation of driving the front loader (9) is performed. The engine (5) is rotated at high speed and the engine (5) is rotated at a low speed by the operation of stopping the front loader (9), and the engine is manually turned on and off by the operator. When a loader output raising switch (37) which is an automatic changeover switch is provided, and the loader output raising switch (37) is turned on by detecting a stop operation of a bucket lever (31) which is a working lever for driving the front loader (9). Automatically perform the engine (5) rotation deceleration operation by the electronic governor (30). The loader output raising switch (37) is switched between when the traveling road surface of the tractor (1) is heavy on a soft mud or an uphill and when the traveling road surface of the tractor (1) is hard and the traveling load is small. This prevents the engine (5) from decreasing in rotation and becoming negative when the traveling load is large.

This embodiment is constructed as described above. As shown in the flow chart of FIG. 3, when the loader output raising switch (37) is turned on and the bucket lever (31) is supported at the neutral position, The foot accelerator operation is started, and when the value of the foot accelerator sensor (36) added with the dead zone is smaller than the value of the rotation sensor (34), the electronic governor (30) decelerates while the foot accelerator sensor subtracted the dead zone. When the value of (36) is greater than the value of the rotation sensor (34), the electronic governor (30) operates to increase the speed, and the operator depresses the foot accelerator pedal (29) to increase or decrease the rotation speed of the engine (5). You can

The loader output raising switch (3
When the hand accelerator sensor (35) value is greater than or equal to the foot accelerator sensor (36) value when 7) is kept off, the hand accelerator operation is started, and the hand accelerator sensor with the dead zone added. When the value (35) is smaller than the rotation sensor value, the electronic governor (30) decelerates, while when the value of the hand accelerator sensor (35) obtained by subtracting the dead zone is larger than the value of the rotation sensor (34), the electronic governor (30). Is accelerated and the operator manually operates the hand accelerator lever (28) to operate the engine (5).
The number of rotations can be increased or decreased.

Further, the loader output raising switch (3
Even if 7) is on, when the bucket lever (31) is operated to a position other than the neutral position, the hand accelerator operation is started, and the electronic governor (30) operates based on the value of the hand accelerator sensor (35). At the same time, even if the loader output increasing switch (37) is off, if the foot accelerator sensor (36) value is larger than the hand accelerator sensor (35) value, the foot accelerator operation is started and the foot accelerator sensor (36) is started. The electronic governor (30) operates based on the value.

[0018]

As is apparent from the above embodiments, the present invention is provided with the output control member (30) for controlling the rotation of the engine (5) based on the operation of the hand accelerator lever (28) or the foot accelerator pedal (29). , An agricultural tractor equipped with a working machine (9) driven by the engine (5), the engine (5) causes the hand accelerator lever (2) to be operated by an operation of driving the working machine (9).
8) so that the set number of revolutions is the same as that of the working machine (9).
A controller (3) for automatically controlling the output control member (30) so that the engine (5) reaches a set rotation speed of the foot accelerator pedal (29) by an operation of stopping the engine.
8) in which the engine (5) is rotated at a high speed by an operation of driving the working machine (9) and the engine (5) is rotated at a low speed by an operation of stopping the working machine (9). 5) Since the rotation control is automatically performed, it is possible to reduce the noise and the fatigue of the operator, and it is possible to easily reduce the fuel consumption of the engine (5).

Further, an automatic changeover switch (37) which is turned on / off by a manual operation by an operator is provided, and the working machine (9) is provided.
Configured to automatically perform a rotation deceleration operation of the engine (5) by the output control member (30) when the automatic changeover switch (37) is turned on by detecting a work lever (31) stop operation for driving The automatic changeover switch (3) is used depending on, for example, whether the traveling road surface of the tractor (1) has a heavy traveling load due to soft mud or an uphill slope and the traveling road surface of the tractor (1) has a hard traveling road surface.
By switching 7), it is possible to eliminate the problem that the rotation of the engine (5) is reduced when the traveling load is large and the engine (5) stops due to a negative load.

[Brief description of drawings]

FIG. 1 is an electronic governor control circuit diagram.

FIG. 2 is an overall side view.

FIG. 3 is a flowchart of FIG. 1;

[Explanation of symbols]

(5) Engine (9) Loader (working machine) (28) Hand accelerator lever (29) Foot accelerator pedal (30) Electronic governor (output control member) (31) Bucket lever (working lever) (37) Loader output raising switch (Automatic changeover switch) (38) Electronic governor controller

Claims (2)

[Claims] 1. An agricultural tractor equipped with an output control member for controlling engine rotation based on operation of a hand accelerator lever or a foot accelerator pedal, and an agricultural tractor equipped with a working machine driven by the engine, the engine being operated by driving the working machine. Is provided with a controller for automatically controlling the output control member so that the engine speed reaches the set rotation speed of the foot accelerator pedal by the operation of stopping the working machine. Agricultural tractor. 2. An automatic changeover switch that is manually turned on and off by an operator is provided, and when the automatic changeover switch is turned on by detecting a work lever stop operation that drives a work machine, the engine rotation deceleration operation by the output control member is automatically performed. The agricultural tractor according to claim 1, wherein the agricultural tractor is configured so as to be automatically operated.