JPH0923707A - Work vehicle - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To easily switch the operation of a PTO clutch between a planting work machine and a management work machine by a switching means to achieve versatility and efficient use of a riding rice transplanter. A first connecting member for connecting to a link device.
4 and a second connecting to the operating portion of the PTO clutch 10.
Switching member 6 having a connecting member 15 of No. 3 and a third member 16 connecting to the hydraulic lifting device, and when the work machine with planting is mounted, the second connecting member 15 and the third connecting member 1
6 is connected, and when the management work machine is attached, the first connecting member 14 and the second connecting member 15 are connected in a direction in which the PTO clutch 10 is disconnected by lowering the link device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle in which a planting work machine or a management work machine is replaceably mounted on a link device connected to a traveling machine body, and more particularly to a work machine drive device in the work vehicle. .

[0002]

2. Description of the Related Art In general, a riding rice transplanter is equipped with a work machine with a plant attached to the rear of the traveling machine body via a link device, and controls the hydraulic lifting device to raise and lower the work machine with the planting machine. Power is transmitted from the PTO power transmission shaft of the PTO power transmission device to the planted work machine.

The PTO power transmission device includes a PTO
When the hydraulic lifting device is operated to a predetermined lower limit range (automatic) with a clutch interposed, the PTO clutch is connected to drive the work equipment with planting, and the hydraulic lifting device is moved upward from the predetermined lower limit range. Operating the planting work machine, the PTO clutch is automatically disengaged and the work of the planting work machine is stopped while the planting work machine is raised. It is being operated, and as a part of it, it is considered to use the riding rice transplanter as a management work machine by taking advantage of its light weight and high vehicle height.

[0004]

However, when the traveling machine body of the above-mentioned riding rice transplanter is used as it is, and a management work machine such as a sprayer is attached to form a management work vehicle, the link device has a predetermined lower limit as described above. As the PTO clutch is automatically disengaged when it rises from the area, the stem culm is generally in an extended state, and therefore, in the management work for working in the ascended position of the link device, driving work may be performed. Can not. Therefore, a troublesome work such as removing wires and links is forced, which hinders the versatility and efficient use of the riding rice transplanter.

Therefore, according to the present invention, the switching means enables the PT
It is an object of the present invention to provide a work vehicle that is configured so that the operation of the O-clutch can be easily switched between the work machine for planting and the work machine for management, thereby solving the above problems.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and allows a working machine (3 or 5) to be detachably attached to a traveling machine body (2) via a link device (7). When the hydraulic device is mounted and the link device is controlled to be lifted and lowered by the hydraulic lifting device (17, 4), and the work machine with planting (3) is mounted as the working device, the hydraulic lifting device is in a predetermined lower limit range. , A PTO clutch (10) intervening in a PTO transmission device for transmitting power from the traveling machine body (2) to the working machine is connected to drive the working machine, and from a predetermined lower limit region of the hydraulic lifting device to a rising direction. In the working vehicle in which the PTO clutch is disengaged and the drive of the working machine is automatically stopped by the movement of, the hydraulic lifting device (17) and the operating portion of the PTO clutch (10) are connected. At the connecting part, When a management work machine (5) is installed as the work machine with a switching means (6) for switching the operation of the TO clutch interposed, the switching means moves in a rising direction from a predetermined lower limit region of the hydraulic lifting device. The PT
It is characterized in that the O-clutch (10) is released.

Desirably, the switching means (6) is connected to the link device (7) by a first connecting member (14).
And a third connection member (15) connected to the operating portion of the PTO clutch (10) and a third connection member (16) connected to the hydraulic lifting device (17). (6) connects the second connecting member (15) and the third connecting member (16) when the planting work machine (3) is mounted, and further connects the management work machine (5). When mounted, the first connecting member (14) and the second connecting member (15) are connected at least in the direction in which the PTO clutch (10) is disengaged when the link device (7) is lowered.

[0008]

Based on the above construction, in the state where the linking device (7) is equipped with the planting work machine (3), the switching means (6) includes the hydraulic lifting device (17) and the operating portion of the PTO clutch (10). To keep them connected. In this state, if the hydraulic lifting device (17) is operated to a predetermined lower limit range (specifically, the automatic position), the planting work machine (3) is lowered to the lower limit range and the PTO clutch (10) is connected. , The planting work machine (3) is driven. When the hydraulic lifting device (17) is operated in the upward direction from the predetermined lower limit region, the planting work machine (3) is raised and the PTO clutch (10) is automatically disengaged, so that the planting work machine (3) is released. ) Driving is stopped.

On the other hand, when the management work machine (5) is mounted on the link device (7), the switching means (6) is switched so as to release the stop of the PTO clutch (10) due to the ascending. In this state, even if the link device is in the raised position outside the predetermined lower limit region, the PTO clutch (10) is not disengaged, and the management work machine (5) can be driven.

Specifically, in the state in which the planting work machine (3) is mounted, the switching means (6) has the second connecting member (15).
And the third connecting member (16). In this state, the third and second connecting members (16) (1) are operated by operating the hydraulic lifting device (17) to a predetermined lower limit region (automatic position).
The PTO clutch (10) is connected and operated via 5),
Further, the PTO clutch (10) is automatically disengaged by an ascending operation outside the predetermined lower limit region.

When the management work machine (5) is installed,
The switching means (6) connects the first connecting member (14) and the second member (15) in a predetermined relationship. In this state, when the link device (7) is lowered, the first connecting member (14) is moved, for example, via the wire 12, and the second connecting member (15) is further linked to the PTO clutch (10). Disconnect. On the contrary, even if the link device (7) is lifted from the lowered position, the second connecting member (15) is not linked and the PTO clutch (10) is maintained in the same state (connected or disconnected).

The reference numerals in parentheses are for the purpose of contrasting with the drawings, but do not limit the structure of the present invention.

[0013]

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

As shown in FIG. 1, the riding rice transplanter 1 has a traveling machine body 2, which is provided with wheels, a driver's seat, an engine, a transmission, etc., and the rotation of the engine is controlled by each wheel. And is output to the PTO shaft 8 via a PTO transmission device (not shown). Further, a PTO clutch 10 is interposed in the PTO transmission device, and rotation of the engine is transmitted to a working machine, for example, a planting working machine 3 through the PTO shaft 8 and the propeller shaft 9 by connecting the clutch. It Furthermore, the traveling body 2
A link device 7 is movably connected to the rear side of the vertical direction, and the link device 7 is driven up and down by a hydraulic cylinder 4 which constitutes a part of the hydraulic lifting device, and the planting work machine (3 ) And other work machines are detachably attached.

Further, since the riding rice transplanter 1 generally has a high ground clearance, as a part of multipurpose use taking advantage of its advantage, as shown in FIG. Management work machine 5
In this case, unlike the above-mentioned planting work, the management work machine 5 is held in a raised position such as a horizontal state by the hydraulic cylinder 4 and the recirculation device 7, and in this state It is necessary to turn on the PTO clutch 10 to drive the management work machine 5.

According to the present invention, as described above, a simple switching operation is performed in response to different function requirements when the rear working machine is replaced with the common traveling machine body 2 for multipurpose use.
Corresponding.

FIGS. 1 (a) and 1 (b) are a plan view and a side view of a riding rice transplanter 1 having a planting work machine 3 mounted on a rear portion thereof, and FIGS. 2 (a) and 2 (b) show a boom at a rear portion thereof. FIG. 1 is a plan view and a side view in which a management work machine 5 such as a sprayer is mounted. Both work machines are mounted on a rear portion of a common traveling machine body 2 by a link device 7 and are rotated based on the connection of a PTO clutch 10 to a PTO. It is driven by extracting power from the shaft 8.

At the rear portion of the frame 2c of the traveling machine body 2,
As shown in FIG. 3, a rear support column 2a and a driver's seat support column 2b are provided upright, and a lower link 7a of a link device 7 is supported on the rear support column 2a so as to be rotatable in the vertical direction. The support 2b is provided with the switching means 6 according to the present invention, and the cam 17 is rotatably supported by the support shaft 17a. The cam 17 is connected to a hydraulic lever (not shown) and a hydraulic valve, and the hydraulic valve is operated in accordance with the rotation of the cam 17, and the hydraulic cylinder 4 is controlled to raise and lower the working machine. Therefore, it constitutes a part of the hydraulic lifting device.

Further, the switching means 6, as shown in FIG. 4 (a), includes first, second and third arms 14, 15, 16
Each of these arms is rotatably supported by a fulcrum shaft 13 which is horizontally supported by the driver's seat support column 2b. The first arm 14 and the lower link 7a are connected to each other via the wire 12, and the second arm 15 is connected to the operation portion of the PTO clutch 10 via the wire 18.

That is, on the fulcrum shaft 13, a second arm 15 and a third arm 16 are independently and rotatably supported in parallel on the outer side of the first arm 14 with a space therebetween. The PTO clutch 1 is attached to the tip of the second arm 15.
The terminal 15a of the wire 18 connected to 0 is fixed. Further, as shown in FIG. 4 (b), the support member 19 is welded to the upper end of the end 15a of the second arm 15, and the stopper rotation shaft 20 penetrates through the center of the support member 19 to cause the stopper rotation. A first stopper 21 is welded to one end of the moving shaft 20,
A second stopper 22 is fixed to the other end by a nut 23, and the stopper rotating shaft 20, the first stopper 22
The stopper 21 and the second stopper 22 are integrally rotatably arranged.

At the time of the planting work, as shown in FIG. 4 (a), the second arm 15 and the third arm 16 are sandwiched between the first stopper 21 and the second stopper 22 to be integrated with each other. And pivots around the fulcrum shaft 13, and the first arm 14
Therefore, the relationship between the wire 12 connected to the lower link 7a and the wire 18 connected to the clutch 10 is broken. Further, a roller 16a provided at the opposite end of the fulcrum shaft 13 of the first arm 16 comes into contact with the cam 17 and rotates, so that the cam 17 causes the PTO to pass through the wire 18 and the PTO.
The clutch 10 is operated.

The cam 17 is formed in a substantially concentric circle shape having a convex portion corresponding to the automatic position, that is, the planting / automatic position of the hydraulic lever when the working machine is set to a predetermined lower limit region. When operated to the planting / automatic position, the planting work machine 3 descends to the planting position and the PTO clutch 10 is turned on. When the hydraulic lever is operated in the ascending direction from the planting / automatic position, the cam operates the hydraulic valve to raise the work machine and the PTO clutch 1
0 turns off.

Further, as shown in FIG. 4B, a pin 25 is welded to one end side of the first stopper 21 of the support member 19 and a pin 26 welded to the first stopper 21. A spring 27 is provided between them, and when the management work machine 6 is mounted, the first stopper 21 and the second stopper 22 are rotated around the stopper rotation shaft 20. Then
Due to the urging force of the spring 27, the stopper rotation shaft 20 is in a two-position stable almost right angle state beyond the dead center, and the width of the first stopper 21 located below is equal to the width of the first arm 14.
Between the second arm 15 and the second arm 15, the relationship between the second arm 15 and the third arm 16 is broken, and therefore the relationship between the operation of the cam 17 is eliminated, and the second arm 1
The second stopper 22 located above 5 engages with the upper end of the first arm 14 as shown in FIG.

In this state, even if the hydraulic lever is operated to operate the management work machine 5 to the predetermined raised position, the third arm 16 rotated by the cam 17 still has the PTO clutch 10.
Since the connection with the second arm 15 that is connected to the PTO clutch 10 is disconnected, the PTO clutch 10 is not disconnected. Therefore, the PTO clutch is appropriately operated by a dedicated lever or the like. Further, when there is a risk that the management work machine 5 descends by a predetermined amount and interferes with the naps and the like, the wire 12 is pulled by the downward rotation of the lower link 7a, and the first arm 14 causes the fulcrum shaft 13 to move. The second stopper 22 abuts on the upper end of the first arm 14 to move the second arm 15 as a unit by rotating the wire 18 upward.
The PTO clutch 10 is disconnected via.

On the contrary, even if the link device 7 is operated from the lowered position to the horizontal position and further to the raised position, the end 12a of the wire 12 is
Is separated from the connecting portion 7c of the lower link 7a, the first
It has no effect on the arm 14 and thus on the PTO clutch 10. Further, in this state, even if the PTO clutch 10 is operated to the connection position or the disconnection position by the dedicated operation lever or the like, the contact between the second stopper 22 and the first arm 14 is released, or the wire end is released. 12a and connecting part 7
These operations do not interfere with each other only if c and c approach.

As described above, the second arm 15 is rotated by switching the first stopper 21 and the second stopper 22 about the stopper rotating shaft 20 so as to switch the second arm 15 from each other.
By engaging with the first arm 14 or the third arm 16, it is possible to cope with the planting work or the management work.

Further, since the angle at which the joint 19 for transmitting from the PTO shaft 8 to the propeller shaft 9 is driven is significantly different between the planting work and the management work, the PTO
As shown in FIG. 6, the connecting pin hole of the front joint fitting 19a for connecting the shaft 8 and the joint 19 is formed with an elongated hole 19b in the rotation direction.
By using the lower end of the long hole 19b for management work and the upper end of the long hole 19b for planting work, it is possible to moderate the refraction angle of the joint 19 and reduce the pulsation change. You can make a simple transmission.

[0028]

Industrial Applicability According to the present invention, when a work machine with a plant is mounted on a traveling machine body, the work machine is automatically driven in the lower limit region of the hydraulic lifting device, and the work machine is automatically driven in a raised position. Although it is stopped, by operating the switching member that switches the work machine drive range between when the work machine with planting is installed and when the work machine is installed with management work machine, when the management work machine is installed on the machine, the hydraulic lifting device Since the automatic drive stop of the working machine at the raised position is released, it is possible to easily cope with the planting working machine and the management working machine with a simple switching operation.

Further, when the management work machine is mounted, when the first connecting member and the second connection member are configured to be linked with each other (claim 2), the management work machine is brought into a predetermined lowered state and the napped culm. The PTO clutch is automatically disengaged when there is a risk of interfering with the above. Therefore, it is possible to prevent problems such as damage to the naps during the management work.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a work machine for planting is mounted on a traveling machine body, (a) is a plan view, and (b) is a side view.

FIG. 2 is a diagram showing a state in which a boom sprayer (management work machine) is mounted on a traveling body, (a) is a plan view, and (b) is a side view.

FIG. 3 is a side view showing a switching unit.

4A and 4B are views showing a switching means, FIG. 4A is a bottom view when the work machine with planting is attached, and FIG. 4B is an enlarged side sectional view of a portion A in FIG. 4A.

FIG. 5 is a cross-sectional view of a switching unit during management work.

FIG. 6 is a side view showing a joint that transmits from a PTO shaft to a propeller shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Riding rice transplanter 3 Working machine with planting 5 Management working machine (boom sprayer) 6 Switching means 8 PTO shaft 10 PTO clutch 12 Wire 14 First arm 15 Second arm 16 Third arm 17 Cam 21 First stopper 22 Second stopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuhiro Horio 1-40, Nisshin-cho, Omiya-shi, Saitama Prefecture 2 Biological specific industrial technology research promotion mechanism (72) Inventor Masaoka Matsuoka Higashi-Izumo-cho, Yatsuka-gun, Shimane Prefecture Address 667, Iyamachi 1 Mitsubishi Agricultural Machinery Co., Ltd.

Claims (2)

[Claims] 1. When a working machine is detachably mounted on a traveling machine body via a link device, the link device is vertically controlled by a hydraulic lifting device, and a work machine with a plant is mounted as the working machine, In a state where the hydraulic lifting device is within a predetermined lower limit region, a PTO clutch intervening in a PTO transmission device for transmitting power from the traveling machine body to the working machine is connected to drive the working machine, and a predetermined amount of the hydraulic lifting system is provided. In a working vehicle in which the PTO clutch is disengaged and the drive of the working machine is automatically stopped by moving in the upward direction from the lower limit region, the hydraulic lifting device and the operating portion of the PTO clutch are connected. When a switching means for switching the operation of the PTO clutch is interposed in the connecting portion and a management work machine is mounted as the working machine, the switching means causes the switching means to have a predetermined lower limit of the hydraulic lifting device. Made by releasing the disconnection of the PTO clutch by movement in the upward direction from the working vehicle. 2. The switching means includes a first connecting member connected to the link device, a second connecting member connected to an operating portion of the PTO clutch, and a third member connected to the hydraulic lifting device. The switching means connects the second connecting member and the third connecting member when the planting work machine is mounted, and when the management work machine is mounted, The work vehicle according to claim 1, wherein the first connecting member and the second connecting member are connected at least in a direction in which the PTO clutch is disengaged by lowering the link device.