JP3312062B2 - Farm work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural work vehicle in which a working device is connected to a rear portion of a traveling machine body by a drive mechanism so as to be able to move up and down.

[0002]

2. Description of the Related Art Some agricultural work vehicles as described above are configured such that, when a traveling transmission is operated in a reverse direction, a work mechanism is forcibly raised by a drive mechanism. As a result, when the traveling machine is to be moved backward while the working device is positioned on the ground, the working device is automatically raised, and the traveling machine is directly moved with the working device positioned on the ground. It is possible to prevent a situation in which the working device is moved backward and is damaged.

[0003]

The rotary tilling device connected to the rear of the traveling body of the agricultural tractor digs into the ground to some extent and plows the soil. State. With this, in a state where the rotary till is being plowed by the rotary till, as described above, the traveling tiller is operated to the reverse side, and even if the rotary till is raised, the rotary tiller is operated. By the time the vehicle is lifted to a sufficient height from the ground, a situation may occur in which the traveling body starts to reverse.

[0004] Therefore, when the above-mentioned condition occurs, the rotary tilling device is forced to push rearwardly raised soil rearward as the traveling body moves backward, so that the rotary tilling device is not used. The rear cover may be damaged. The present invention relates to an agricultural work vehicle configured such that when the traveling transmission is operated in the reverse direction, the working device is forcibly raised. Therefore, it is an object to prevent a state in which the working device is damaged.

[0005]

A feature of the present invention is that an agricultural work vehicle is configured as follows. [1] A working device is connected to the rear part of the traveling body so as to be able to move up and down freely by a drive mechanism, and the speed change operation tool for traveling is operated to the reverse side.
Reverse state detecting means for detecting that
Operate the traveling transmission to the reverse based on the gear detection.
Control device for operating the drive mechanism so that the working device (4) is forcibly operated to be raised based on the detection of the reverse state detection device. Ascending state detecting means for detecting that the device has risen to the set height with respect to the traveling body, and until the working state has detected that the working apparatus has risen to the set height with respect to the traveling body, the traveling state of the traveling body is detected. Checking the reverse and setting the work equipment for the traveling aircraft
Elevation to the height is detected by the ascent detection means
A reverse check means is provided for releasing the check when the check is made.

[2] A working device is connected to the rear part of the traveling body by a drive mechanism so as to be able to move up and down freely, and a speed change operation tool for traveling is operated to the reverse side.
Reverse state detecting means for detecting that
Based on the detection of the gear, the hydrostatic continuously variable transmission
A control device that operates on the forward side, and a reverse ascending control unit that operates a drive mechanism such that the working device is forcibly operated to be raised based on detection of the reverse state detection unit,
Ascending state detecting means for detecting that the working device has risen to the set height with respect to the traveling body by the reverse ascending control means, and detecting that the working device has risen to the set height with respect to the traveling body by the rising state detecting means. until, restrain reverse the vehicle body by the hydrostatic continuously variable transmission for cars
And the implement is raised to the set height with respect to the traveling
When the ascent is detected by the ascent state detecting means,
A reverse check means for releasing the check is provided.

[3] A working device is connected to the rear part of the traveling body by a drive mechanism so as to be able to move up and down freely, and the speed change operation tool for traveling is operated to the reverse side.
Reverse state detecting means for detecting that
Operate the traveling transmission to the reverse based on the gear detection.
Control device for operating the drive mechanism such that the working device is forcibly raised based on the detection of the reverse state detection device, and the shift operation tool is operated to the reverse side. That the reverse movement of the traveling body has been restrained and the shift operation device has been operated in the reverse direction until the set time has elapsed since the detection of the reverse
Has been detected by the reverse
When the time has elapsed, a reverse check means is provided to release the check.

[4] A working device is connected to the rear part of the traveling body so as to be able to move up and down freely by a drive mechanism, and the speed change operation tool for traveling is operated to the reverse side.
Reverse state detecting means for detecting that
Based on the detection of the gear, the hydrostatic continuously variable transmission
A control device that operates on the forward side, and a reverse ascending control unit that operates a drive mechanism such that the working device is forcibly operated to be raised based on detection of the reverse state detection unit,
Until the set time elapses after the reverse operation state detecting means detects that the shift operation device has been operated to the reverse side, the reverse of the traveling body by the traveling hydrostatic continuously variable transmission is towed.
Control gear has been moved to the reverse side.
Set time has elapsed since the detection
Then, a reverse check means for releasing the check is provided.

[0009]

[I] According to the features of claims 1 and 2, when the traveling speed change operation tool is operated to the reverse side, the forcible lifting operation of the working device is started. In this case, the backward movement of the traveling machine body (reverse movement of the traveling machine body by the hydrostatic continuously variable transmission for traveling) is suppressed until the working apparatus rises to the set height with respect to the traveling machine body. When the vehicle rises to the set height with respect to the aircraft, the above-described restraint state is released, and the traveling aircraft starts moving backward.

Thus, according to the features of the first and second aspects, when the speed change operation device for traveling is operated to the reverse side, the traveling body does not immediately start to reverse, but the working device is sufficiently equipped. After the ascending operation is performed to the height (set height for the traveling aircraft), the traveling aircraft starts reversing, so the forcible ascent operation of the work equipment is delayed, and the traveling aircraft presses the soil on the ground with the work equipment. Is avoided to start reverse.

[II] According to the features of claims 3 and 4, when the speed change operation tool for traveling is operated to the reverse side, the forcible operation of raising the working device is started, Reverse travel (reverse travel of the traveling body by the hydrostatic continuously variable transmission for traveling) is suppressed .
In this case, when the set time elapses after the traveling speed change operation tool is operated to the reverse side, the above-described check state is released, and the traveling body starts reverse.

According to the third and fourth aspects of the present invention, when the traveling speed change operation tool is operated to the reverse side, the traveling body does not immediately start the reverse movement, but the traveling mode change.
After the set time elapses after the speed operating device is operated to the reverse side, the traveling body starts to move backward, so that the working device is raised to a sufficient height during the set time. A situation in which the forcible lifting operation of the device is delayed and the traveling body starts moving backward while pushing the soil on the ground by the work device is avoided.

[0013]

According to the first and second aspects of the present invention, when the speed change operation tool for traveling is operated to the reverse side and the forcible lifting operation of the working device is started, the working device is moved to the traveling body. until rises to a set height for the reverse of the vehicle body (the reverse of the traveling machine body by the hydrostatic continuously variable transmission for cars) 牽
By be configured to control, with a delay forced rise operation of the working device, vehicle body while holding down the soil of the ground by the work device will be able to avoid in advance the state say that to start reverse In this way, it is possible to prevent the working device from being damaged when the traveling body moves backward.

According to the features of claims 3 and 4,
When the shift operation tool is operated to the reverse side and the forcible raising operation of the working device is started, the traveling body is moved backward until the set time elapses (the traveling body is driven by a hydrostatic continuously variable transmission for traveling). by configured to check the reverse), with a delay of forced rise operation of the working device, it is avoided in advance the state say that the vehicle body while holding down the soil of the ground to start the reverse by the working device As a result, it is possible to prevent the working device from being damaged when the traveling body moves backward.

[0015]

Embodiments will be described below with reference to the drawings. FIG.
As shown in the figure, a rotary tillage device 4 (corresponding to a working device) is connected to the rear part of the traveling body via a three-point link mechanism 3 composed of a pair of left and right lower links 1 and a top link 2 so as to be able to move up and down. Therefore, it constitutes an agricultural tractor. The lower link 1 is lifted and supported via a lift rod 7 by a pair of left and right lift arms 6 which are vertically operated by a lift cylinder CY1 (corresponding to a drive mechanism) arranged above a transmission case 5 of the traveling body. The rotary tilling device 4 is configured to be moved up and down by extending and retracting the lift cylinder CY1.

The agricultural tractor is configured to control the operation of the lift cylinder CY1 so that the tilling depth of the rotary tilling device 4 is maintained at a set value during the tilling operation. As shown in FIGS. 1 and 3, the vertical swinging position corresponding to the tillage depth of the rear cover 8 slidably provided around the horizontal axis X at the rear part of the rotary tillage device 4 is set by a potentiometer type tillage. The microcomputer is provided so that the tillage depth detected by the depth sensor 9 and the tillage depth detected by the tillage depth sensor 9 matches the set value of the potentiometer type tillage depth setting device 10 arranged in the control section of the traveling machine. The control device 11 controls the switching of the electromagnetic hydraulic control valve V1 for the lift cylinder CY1.

As shown in FIG. 1, a traveling machine is equipped with a traveling hydrostatic continuously variable transmission H (corresponding to a traveling transmission). The trunnion shaft 12 is provided with a shift lever 13 (for traveling)
(Corresponding to the speed change operation tool of FIG. 1) by the hydraulic cylinder CY2 for speed change. The operating position of the shift lever 13 is detected by a potentiometer type speed setting device 14 (corresponding to a reverse state detecting means), and the operation arm 15 of the trunnion shaft 12 and the hydraulic cylinder CY2 are detected.
Of the trunnion shaft 12
Is detected by a potentiometer type feedback sensor 17, and the control device 11 controls the electromagnetic control valve V for the hydraulic cylinder CY2 so that the detection value of the feedback sensor 17 matches the set value of the speed setting device 14.
2 is switched and controlled.

As shown in FIG. 1, when the speed change lever 13 is operated to the reverse side, the lift cylinder CY1 is forcibly operated to raise the rotary tillage device 4 to the maximum ascending position.
Rise control means A for operating the vehicle, reverse rise control means A
In the ascending operation by the ascending operation, ascending state detecting means for detecting that the rotary tillage device 4 has risen to the set height with respect to the traveling body, when the shift lever 13 is operated to the reverse side, the rotary tillage device 4 increase state detecting means that it has increased to a set height Te until detected, and a reverse restraint means B for restraining the operation to the reverse side of the hydraulic cylinder CY2.

As shown in FIGS. 1 and 3, a lift arm angle sensor 18 of a potentiometer type for detecting the rotation angle of the lift arm 6 is provided at the rotation fulcrum of the lift arm 6 on the traveling machine side. The sensor 18 detects the height of the rotary tillage device 4 relative to the traveling machine body. Thereby, the lift arm angle sensor 1
8 constitutes a rising state detecting means. The reverse climb control means A and the reverse restraint means B are provided in the control device 11 in the form of a control program, and the control device 11 executes control as follows.

As shown in FIG. 2, when the speed setting device 14 detects that the operation position of the shift lever 13 has changed from the neutral operation range to the reverse side, the trunnion shaft 12 is operated to the shift neutral position. The hydraulic cylinder CY2 is operated at this time, and this state is maintained.
The rotary tilling device 4 is forcibly moved up to the maximum ascending position by operating Y1 (steps # 1, # 2, #).
3). Next, when it is detected by the lift arm angle sensor 18 that the lift arm 6 has risen to the set height with respect to the traveling body, the state in which the trunnion shaft 12 is maintained at the shift neutral position is released, and the shift lever is shifted. The hydraulic cylinder CY2 operates so that the trunnion shaft 12 is operated to the shift position corresponding to the operation position of the thirteen (step #)
4, # 5). As described above, steps # 2 and # 4 constitute reverse braking control means B, and step # 3 constitutes reverse climb control means A.

[Another Embodiment] Instead of the above-described configuration, the hydraulic cylinder C is operated until the set time elapses from the time when the shift lever 13 is operated to the reverse side.
It is good also as composition provided with reverse check means B which checks operation to the reverse side of Y2. In this case, the content of the determination in step # 4 shown in FIG. 2 is changed to a determination as to whether or not a set time has elapsed since the shift lever 13 was operated to the reverse side, and the shift lever 13 was shifted to the reverse side. The trunnion shaft 12 is maintained at the shift neutral position until the set time elapses after the operation. Therefore, in this configuration, the lift arm angle sensor 18 becomes unnecessary. When the speed change lever 13 is operated to the reverse side instead of the configuration in which the speed setting unit 14 also serves as the reverse state detecting means, a dedicated reverse state detecting means such as a limit switch (not shown) for detecting the reverse operation is provided. May be provided.

In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a block diagram of control.

FIG. 2 is a diagram showing a control flow;

FIG. 3 is a perspective view of the rear part of the agricultural tractor.

[Explanation of symbols]

Reference Signs List 4 work device 11 control device 13 speed change operation tool 14 reverse state detecting means 18 ascent state detecting means A reverse upward control means B reverse check means CY1 drive mechanism H transmission for traveling, hydrostatic continuously variable transmission for traveling

Claims (4)

(57) [Claims] A driving mechanism (CY1) is provided at a rear portion of the traveling body.
The work device (4) is connected so as to be able to move up and down freely, and the speed change operation tool (13) for traveling is operated to the reverse side.
Reverse state detection means (14) for detecting the reverse
Transmission for traveling based on detection of output means (14)
A control device (11) for operating (H) in the reverse direction, and the drive mechanism (CY1) such that the working device (4) is forcibly raised based on the detection of the reverse condition detection means (14). ) Is operated, and the reverse climb control means (A) detects that the working device (4) has risen to a set height with respect to the traveling body by the reverse climb control means (A). And means (18) for restraining the backward movement of the traveling machine body until the rising state detecting means (18) detects that the working device (4) has risen to the set height with respect to the traveling machine body , and Work
Equipment (4) has risen to the set height with respect to the traveling aircraft
Is detected by the rising state detecting means (18).
Then, the agricultural work vehicle is provided with a reverse check means (B) for releasing the check. 2. A driving mechanism (CY1) is provided at a rear portion of the traveling body.
The work device (4) is connected so as to be able to move up and down freely, and the speed change operation tool (13) for traveling is operated to the reverse side.
Reverse state detection means (14) for detecting the reverse
Hydrostatic stepless for traveling based on the detection of the exit means (14)
A control device (11) for operating the transmission (H) in the reverse direction
And a reverse ascent control means (A) for operating the drive mechanism (CY1) such that the working device (4) is forcibly raised based on the detection of the reverse state detection means (14). In addition, ascending state detecting means (18) for detecting that the working device (4) has risen to a set height with respect to the traveling body by the reverse ascent control means (A), and the working device (4) running Until the rising state detecting means (18) detects that the body has risen to the set height, the reverse of the traveling body by the traveling hydrostatic continuously variable transmission (H) is restrained, and Said work
When the device (4) has risen to the set height with respect to the traveling
Is detected by the rising state detecting means (18).
And an agricultural work vehicle provided with reverse check means (B) for releasing the check. 3. A driving mechanism (CY1) is provided at a rear portion of the traveling body.
The work device (4) is connected so as to be able to move up and down freely, and the speed change operation tool (13) for traveling is operated to the reverse side.
Reverse state detection means (14) for detecting the reverse
Transmission for traveling based on detection of output means (14)
(H) to the reverse drive side, and the drive mechanism (CY1) so that the working device (4) is forcibly raised based on the detection of the reverse drive state detection means (14). ) Is operated, and a set time elapses after the reverse state detection means (14) detects that the shift operation tool (13) has been operated to the reverse side. up to, and check the reverse of the vehicle body, or
That the speed change operation tool (13) is operated to the reverse side;
Is detected by the reverse state detection means (14)?
An agricultural work vehicle provided with a reverse check means (B) for releasing the check when the set time has elapsed . 4. A driving mechanism (CY1) is provided at a rear portion of the traveling body.
The work device (4) is connected so as to be able to move up and down freely, and the speed change operation tool (13) for traveling is operated to the reverse side.
Reverse state detection means (14) for detecting the reverse
Hydrostatic stepless for traveling based on the detection of the exit means (14)
A control device (11) for operating the transmission (H) in the reverse direction
And a reverse ascent control means (A) for operating the drive mechanism (CY1) such that the working device (4) is forcibly raised based on the detection of the reverse state detection means (14). At the same time, the traveling hydrostatic continuously variable transmission (e.g., when the set time elapses from when the reverse operation state detecting means (14) detects that the shift operation tool (13) is operated to the reverse side). H) to check the reverse of the traveling aircraft , and
When the shift operation device (13) is operated to the reverse side,
At the time of setting after being detected by the advance state detection means (14)
An agricultural work vehicle provided with reverse check means (B) for releasing the check when the time elapses .