JP3701728B2 - Agricultural tractor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an agricultural tractor for mounting a front loader or a tilling work machine for plowing a field, for example, for carrying compost or earth and sand.
[0002]
[Problems to be solved by the invention]
Conventionally, as shown in Japanese Patent Publication No. 7-108627, constant rotation speed control is performed by a hand accelerator lever. For example, when a loader is mounted on a tractor, the hand accelerator lever is kept at a high speed rotation position and the bucket is moved up and down. Since the tractor was run while supporting the bucket at a certain height and compost or earth and sand was transported, the engine rotates at a high speed even when the tractor is running at a low load as in the case of a high load when the bucket is moved up and down. However, noise and fuel consumption could not be reduced easily.
[0003]
[Means for Solving the Problems]
However, the present invention provides an electronic governor (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), and the operation driven by the engine (5). In the agricultural tractor where the machine (9) is installed,
The engine (5) is set to the set rotational speed of the hand accelerator lever (28) by the operation of driving the work machine (9), and the engine (5) is operated by the operation of stopping the work machine (9). Since the electronic governor controller (38) for automatically controlling the electronic governor (30) is provided so as to achieve the set rotational speed of the pedal (29), the engine is rotated at a high speed by an operation of driving the work implement, and Since the engine rotation control for rotating the engine at a low speed by the operation of stopping the work machine is automatically performed, the noise can be reduced to reduce the fatigue of the operator, and the fuel consumption of the engine can be easily reduced. Is.
[0004]
Further, even when an automatic changeover switch (37) that is turned on and off by an operator is provided and the operation of stopping the work machine (9) is stopped, when the automatic changeover switch (37) is on, the electronic governor (30) is used. Since the engine speed reduction operation is automatically performed , for example, when the traveling road surface of the tractor is soft mud or uphill and the traveling load is large, and when the traveling road surface of the tractor is hard and the traveling load is small Thus, by switching the automatic changeover switch, it is possible to eliminate problems such as the engine rotation being reduced and stopping due to negative load when the running load is large.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
1 is a control circuit diagram, FIG. 2 is a side view of the whole, FIG. 3 is a flowchart of FIG. 1, in which (1) is a tractor which is a traveling machine body, and (2) and (3) are front and rear of the tractor (1). (4) is a chassis which is a machine base for mounting the front wheel (2), (5) is an engine mounted on the chassis (4), and (6) is a rear wheel connected to the engine (5). (3) is a power transmission case for mounting, (7) is a driver seat attached to the upper surface of the rear part of the case (6), (8) is a steering handle, and is an attachment of a front loader (9) which is a working machine. A bucket (10) is installed in front of the tractor (1) via a pair of left and right booms (11).
In the figure, (12) is a rear mounting frame that supports the boom (11), (13) is a horizontal mounting frame in which the rear end is integrally connected to the rear mounting frame (12), and (14) is a horizontal mounting frame ( 13) is a front mounting frame that is integrally connected to the front end side, and each frame (12), (13), and (14) is formed in a side view and fixed to the lower surface side of the power transmission case (6). A rear mounting frame (12) is erected on the base table (15) via a rear mounting table (16), and a front mounting frame (14) is mounted on the front end side of the chassis (4) via a front mounting table (17). ) And the gate-shaped frames (12), (13) and (14) are installed symmetrically on both sides of the bonnet (18) covering the engine (5).
[0006]
Further, the base end of the boom (11) is connected to and supported by the upper end of the front mounting frame (12) via a rotation fulcrum pin (19), and between the frame (12) and the boom (11). A hydraulic loader elevating cylinder (21) is interposed between the fixed locking plate (20) and the boom (11) is moved up and down by the expansion and contraction of the cylinder (21).
[0007]
Further, the base ends of the dump cylinder (24) and the dump arm (25) are supported by the fixing brackets (22) and (23) between the middle and the front end of the boom (11), and the cylinder (24) and the arm ( 25) are connected to each other, and the tip of the arm (29) is connected to the rear upper end of the bucket (10) via a dump link (26).
Then, the rear lower end of the bucket (10) is supported on the front end of the boom (11) via a hook arm (27), and the inclination of the bucket (10) is changed by the expansion and contraction of the dump cylinder (24). It is configured.
[0008]
Further, the tractor (9) is provided with a hand accelerator lever (28) operated by a worker who sits on the driver seat (7) and a foot accelerator pedal (29) operated by the operator with his / her foot. Even when the lever (28) is released, the lever (28) is supported at the operated position, and when the foot is released from the pedal (29), the pedal (29) is rotated at a low speed (idle) by the spring force. It is configured to automatically return to the (rotation) position.
[0009]
Further, an electronic governor (30), which is an output control member for controlling rotation by increasing or decreasing the fuel supplied to the engine (5) based on the operation of the lever (28) or the pedal (29), is provided in the hood (18). It is something to be made.
The electronic governor (30) is formed so that the 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 increase or decrease the rotation of the engine (5). ing.
[0010]
Further, a bucket lever (31), which is a work lever that is tilted in the front-rear and left-right directions by an operator of the driver seat (7), is provided on the side of the driver seat (7). The hydraulic valve (not shown) is switched by tilting back and forth, the elevating cylinder (21) is expanded and contracted to raise and lower the bucket (10), 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, and the compost or earth and sand are crushed with the bucket (10), and the compost or earth and sand of the bucket (10) are dropped downward.
The bucket lever (31) is configured to automatically return to a neutral position where the bucket lever (31) is in a substantially upright position by a spring force by releasing the hand from the bucket lever (31).
[0011]
In FIG. 2, (32) is a top link and (33) is a lower link, and a rotary tiller working machine or the like for plowing a farm is installed so as to be movable up and down via each link (32) (33).
[0012]
Further, as shown in FIG. 1, a rotation sensor (34) for detecting the rotation speed of the engine (5) and a potentiometer type hand accelerator sensor (for detecting the set rotation speed (operation amount) of the hand accelerator lever (28)). 35), a potentiometer type foot accelerator sensor (36) for detecting the set rotational speed (operation amount) of the foot accelerator pedal (29), and a loader output raising switch (automatic changeover switch which is manually turned on and off by the operator) 37) and the electronic governor (30) is connected to an electronic governor controller (38) formed by a microcomputer.
[0013]
Further, the raising lever (39) and the lowering switch (40) for operating the elevating cylinder (21) by tilting the bucket lever (31) forward and backward, and the dump cylinder (24) by tilting the bucket lever (31) right and left. Ascending and descending solenoids (43a) and (43b) for switching the hydraulic valve of the elevating cylinder (21) by being excited by the scooping switch (41) and the dropping switch (42) to be operated and the raising and lowering switches (39) and (40) The loader controller (45) formed by a microcomputer is used to switch the hydraulic valve of the dump cylinder (24) by exciting with the scoop and drop switch (41) (42), and the drop solenoid (44a) (44b). Connect.
[0014]
The electronic governor controller (38) and the loader controller (45) are input / output connected to each other.
When the loader output raising switch (37) is turned on and any one of the switches (39) to (42) is turned on by the operation of the bucket lever (31), the electronic control is performed based on the hand accelerator sensor (35). The governor (30) is controlled.
On the other hand, the electronic governor (30) is controlled based on the foot accelerator sensor (36) when the bucket lever (31) is in the neutral position and any of the switches (39) to (42) is off. is there.
The engine (5) is operated to drive the front loader (9), which is a work machine, so that the engine (5) reaches the set rotational speed of the hand accelerator lever (28) and the front loader (9) is stopped. An electronic governor controller (38) for automatically controlling the electronic governor (30), which is an output control member, is provided so that 5) is the set rotational speed of the foot accelerator pedal (29). The front loader (9) The engine (5) rotation control is automatically performed to rotate the engine (5) at a high speed by the driving operation and to rotate the engine (5) at a low speed by an operation to stop the front loader (9).
In addition, a loader output raising switch (37) that is an automatic changeover switch that is manually turned on and off by an operator is provided, and the loader output is detected by detecting the operation of stopping the bucket lever (31) that is a work lever that drives the front loader (9). When the output increase switch (37) is on, the engine (5) rotational speed reduction operation by the electronic governor (30) is automatically performed.
For example, when the traveling road surface of the tractor (1) is soft mud or uphill and the traveling load is large, and when the traveling road surface of the tractor (1) is hard and the traveling load is small, the loader output increase switch (37) Thus, when the traveling load is large, the rotation of the engine (5) is prevented from being reduced and the load being negative.
[0015]
This embodiment is configured as described above. As shown in the flowchart 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 performed. When the value of the foot accelerator sensor (36) to which the dead zone is added is smaller than the value of the rotation sensor (34), the electronic governor (30) is decelerated while the foot accelerator sensor (36) to which the dead zone is subtracted. When the value is larger than the value of the rotation sensor (34), the electronic governor (30) operates at a higher speed, and the operator can step on the foot accelerator pedal (29) to increase or decrease the engine (5) rotation speed.
[0016]
When the load accelerator output raising switch (37) is kept off, if the hand accelerator sensor (35) value is greater than or equal to the foot accelerator sensor (36) value, the hand accelerator operation is started. When the hand accelerator sensor (35) value obtained by adding the dead band is smaller than the rotation sensor value, the electronic governor (30) decelerates, while the hand accelerator sensor (35) value obtained by subtracting the dead band is obtained from the rotation sensor (34) value. When it is larger, the electronic governor (30) operates at a higher speed, and the operator can manually operate the hand accelerator lever (28) to increase or decrease the engine (5) rotation speed.
[0017]
Further, even if the loader output raising switch (37) is on, if the bucket lever (31) is operated to a position other than the neutral position, the hand accelerator operation is started, based on the value of the hand accelerator sensor (35). Even if the electronic governor (30) is operated and the load accelerator output raising switch (37) is OFF, the foot accelerator operation starts when the foot accelerator sensor (36) value is larger than the hand accelerator sensor (35) value. Then, the electronic governor (30) is operated based on the value of the foot accelerator sensor (36).
[0018]
【The invention's effect】
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), and the engine (5). In the agricultural tractor in which the work machine (9) to be driven by is installed, the engine (5) is set to the set rotation speed of the hand accelerator lever (28) by the operation of driving the work machine (9), and the work A controller (38) for automatically controlling the output control member (30) so that the engine (5) reaches the set rotational speed of the foot accelerator pedal (29) by the operation of stopping the machine (9). The operation of driving the working machine (9) causes the engine (5) to rotate at a high speed and the operation of the working machine (9) is stopped. The engine (5) that rotates the engine (5) at a low speed is automatically controlled, so that noise can be reduced and operator fatigue can be reduced, and fuel consumption of the engine (5) can be easily achieved. It can be reduced.
[0019]
Further, even when an automatic changeover switch (37) that is turned on and off by an operator is provided and the operation of stopping the work machine (9) is stopped, when the automatic changeover switch (37) is on, the electronic governor (30) is used. Since the engine speed reduction operation is automatically performed , for example, when the traveling road surface of the tractor (1) is soft mud or uphill and the traveling load is large, the traveling road surface of the tractor (1) is hard. By switching the automatic change-over switch (37) when the traveling load is small, it is possible to eliminate problems such as the engine (5) rotating down and stopping due to negative load when the traveling load is large. It is.
[Brief description of the 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 (work machine)
(28) Hand accelerator lever (29) Foot accelerator pedal (30) Electronic governor (output control member)
(31) Bucket lever (work lever)
(37) Loader output raising switch (automatic switch)
(38) Electronic governor controller

Claims (1)

An electronic governor (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) is provided, and a work machine (9) driven by the engine (5) is mounted. In the agricultural tractor to be installed,
The operation of driving the work implement (9) causes the engine (5) to reach the set rotational speed of the hand accelerator lever (28), and the operation of stopping the work implement (9) causes the engine (5) to move to the foot accelerator. An electronic governor controller (38) for automatically controlling the electronic governor (30) is provided so as to achieve a set rotational speed of the pedal (29) , and
Even when an operator has an automatic changeover switch (37) to turn on and off and the operation of the work machine (9) is stopped, when the automatic changeover switch (37) is on, the engine is rotated by the electronic governor (30). An agricultural tractor configured to automatically perform a deceleration operation .

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