JP3315294B2 - Paddy field vehicle PTO device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PTO device for a paddy field working vehicle for transmitting power of an engine to a working machine attached to a lifting link device at the rear of a paddy field working vehicle.

[0002]

2. Description of the Related Art Conventionally, as a vehicle working in a paddy field or the like, a vehicle having a working machine used for a certain work purpose, such as a rice transplanter, mounted on a rear portion thereof has been known. However, in the case of such a paddy field working vehicle, it is used only for a very short period of planting, and after that period it will not be used until the next year, so it will be stored in a warehouse etc.,
The cost was significantly higher.

In view of the above, various types of working machines having different working purposes and working times, such as a boom sprayer and a granulator, have been proposed which can be replaced and mounted on the rear portion of a working vehicle body to perform different works. I have.

[0004]

By the way, the working position is high in the case of a boom sprayer, the working position is low in the case of a planting part for planting seedlings, and even in the case of a boom sprayer, the working position is further increased depending on the growing condition of rice and the like. It needs to be changed, and the lifting range of the working machine needs to be wide.

[0005] However, since the paddy field working vehicle is set high above the ground to work in the paddy field, the position of the PTO shaft for transmitting power from the engine to the working machine is also set high. On the other hand, the lifting link for mounting and lowering the work machine and the drive shaft for supplying power from the PTO shaft to the work machine are mechanically limited in their length, and the range of movement of the work machine is too large. In addition, the bending angle between the PTO shaft and the drive shaft may exceed the allowable range.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a PTO device for a paddy field working vehicle having a structure in which a drive shaft can be bent at a small angle even when a working machine has a large lifting range.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a work machine attached to a lifting link device (15) at the rear of a paddy field work vehicle (1) has a PT.
In a PTO device for a paddy field working vehicle that transmits engine power via an O-shaft, a drive shaft (22), and the like , a body frame (5b) is provided at a tip end of the PTO shaft (20a ).
A joint (23) attached via a bearing (21) fixed to the shaft, a shaft support (25) for rotatably supporting a bending point of the joint (23), and a shaft support (25). ,
Connected to the PTO shaft (20a) by the joint (23)
Extended PTO shaft (20b) which is, the extended PTO shaft (2
0b) through the holder (26) rotatably supported by the shaft support (25).
A connecting member for pivotally connecting to 5) (29), wherein the
As the lifting link device (15) moves up and down, the shaft support (2)
5) swing the extended PTO shaft (20b) around
It is characterized by its support .

[0008]

The present invention is configured as described above.
When the working machine is raised by the lifting link device (15), the connecting member (29) pivotally connected to the lifting link.
(2) supports the extended PTO shaft (20b).
6) Pull up. Therefore, the extended PTO shaft (20b) is rotated upward by the holder (26) about the pivot (25) at the bending point of the joint as the center of rotation. This and
At the tip of the PTO shaft (20a) and at the shaft support (2
The vicinity of (5) is a bearing (2) fixed to the body frame.
Since it is journalled in 1), in spite of the working machine rises, bending angle formed extended PTO shaft (20b) of the drive shaft to be coupled to the extended PTO shaft (20b) (22)
The change of (α) is small.

When the work machine is lowered, when the lifting link device (15) is lowered, the connecting member (29) pivotally connected to the lifting link supports the extended PTO shaft (20b). (26) is lowered. For this reason
The extended PTO shaft (20b) is rotated about a pivot (25) at a bending point of the joint (23) as a center of rotation, and a holder (26).
To rotate downwards. Therefore, in spite of the working machine is lowered, the change in form bending angle extended PTO shaft (20b) of the drive shaft to be coupled to the extended PTO shaft (20b) (22) becomes small results.

The reference numerals in parentheses above are for comparison with the drawings, but do not limit the configuration of the present invention.

[0011]

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

FIGS. 4A and 4B show a paddy field working vehicle 1 using an embodiment of the PTO device according to the present invention, wherein FIG. 4A is a plan view and FIG. 4B is a side view. As shown in the figure, the paddy field work vehicle 1 has a traveling machine body 5 supported by front wheels 2 and rear wheels 3, and the traveling machine body 5 has an engine mounted on a front portion of the front wheels thereof. A driver's seat (seat) 7 is disposed in an intermediate portion between the front and rear wheels, that is, in a center of gravity of the machine.

A link device 1 is provided behind the traveling body 5.
The planting section 10 is supported so as to be able to ascend and descend through the center 5, and the planting section 10 is provided with a large number of planters 12 and seedling rests 14.

The power supply to the planting section 10 is performed by the PT
O shaft 20a, extended PTO shaft 20b , drive shaft 2
This is performed by transmitting the rotational power from the engine via a PTO device composed of 2 or the like.

FIG. 1 shows a main part of an example of a PTO device which is a feature of the present invention.

As shown in the figure, the lifting link device for lifting and lowering the planting section (working machine) 10 includes a lifting link 15 comprising a top link 15a and a lower link 15b arranged in parallel. The distal ends of these links 15a, 15b are fixed to a cylindrical member 16. The cylindrical member 1
6 is a cylindrical rod 1 bridged between two frames 5b fixed vertically to a body frame 5a of the traveling body 5
9 so as to be rotatable.

A plate 17 is fixed to the top link 15a.
The rod 18b of the cylinder 18 is engaged with a, and when the cylinder 18 operates and the rod 18a expands and contracts, it acts on the top link 15a via the plate 17. For this reason, the lifting link 15 rotates about the attachment position to the seat frame 5b, and moves the planting section 10 attached to the other end of the lifting link up and down.

On the other hand, a PTO shaft 20a extending above the body frame 5a in parallel with the frame 5a constitutes a part of a PTO device for supplying rotational power of the engine to the planting section 10. The vicinity of the end of the PTO shaft 20a is rotatably supported by a bearing ( shaft bearing ) 21 at a predetermined position of the body.

A joint 23 is attached to the tip of the PTO shaft 20a.
Extended PTO shaft 20b is being Tenketsu, the extended PTO shaft
The drive shaft 22 is connected to the other end of the drive shaft 20b via a joint 24. A shaft support 25 is provided at a position where the joint 23 is mounted, and a holder 26 for fixedly supporting the extended PTO shaft 20b is rotatably mounted on the shaft support 25.
A bracket 30 is fixed to the cylindrical member 16 rotatably fitted to the cylindrical rod 19, and a rod 29 is attached between the bracket 30 and an upper end 26a of the holder 26. The connecting portion of the rod 29 with these members has a rotatable structure.

FIG. 3 is a plan view of FIG. 1, with some members omitted. Next, the P
The operation of the TO device will be described.

FIG. 1 shows a state in which the lifting link 15 is lowered, and when the cylinder 18 is operated to extend the rod 18a, a force acts on the top link 15a via the plate 17, and the top link 15a is connected to the cylindrical rod. Rotation is performed with the fulcrum 16 as a fulcrum, and at the same time, the lower link 15b is also rotated, and the planting portion 10 mounted on the rear end of the link device is raised.

At this time, as shown in FIG. 2, the cylindrical member 16 to which the top link 15a is attached also rotates, so that the bracket 30 fixed to the cylindrical member 16 also rotates together. For this reason, the holder 26 is pulled up via the rod 29 rotatably connected to the bracket 30. The holder 26 is a shaft support 2
5 and the extended PTO shaft 2
0b , the extended PTO shaft 20b rotates about the position of the joint 23 according to the rotation of the top link 15a.

For this reason, the PTO shaft 20a from the engine
Compared to when connected directly to the drive shaft 22, extending
The bend angle α between the long PTO shaft 20b and the drive shaft 22 is reduced, and the bend angle α of the drive shaft 22 can be reduced even if the difference in elevation of the planting section 10 is large. Therefore, even if a boom player is mounted in place of the planting section 10 and the working position increases according to the growing condition of the crop, the bending angle α of the drive shaft 22 does not become extremely large and exceeds the allowable range. There is no fear of getting lost.

Next, other features of the above-described paddy working machine will be described.

The same or corresponding parts as those described in the drawings described above are denoted by the same reference numerals, and description thereof will be omitted.

In a paddy field working vehicle such as a rice transplanter, when the planting section 10 is removed from the hitch of the lifting link device, an extreme imbalance due to the weight of the engine or the like results in an extreme front load, which is dangerous depending on the running condition and the like. The case is conceivable. For example, when approaching a field, loading or unloading a truck, downhill, sudden braking, or the like, it cannot be said that there is no fear of being pulled forward. This can be said for a rice field work vehicle based on a rice transplanter, and can be said to be exactly the same state when a boom player or the like is not mounted.

Therefore, the paddy field vehicle has been devised as described below.

That is, as shown in FIG. 5, the balance weight 40 can be attached to the hitch of the lifting link 15 from which the work implement and the planting portion have been removed. As shown in FIGS. 6A and 6B, the balance weight 40 is provided with a hook-shaped portion 40a at the upper front side and a handle 40b at the upper side. In order to attach the balance weight 40 to the hitch, a weight holder 42 as shown in the figure is first attached to the hitch, and the hook 40a of the balance weight 40 is protruded to the rear of the weight holder 42 by holding the handle 40b. Hook on the plate 42a. FIG.
In (b), four balance weights 40 are attached.

On the other hand, when a working machine or a planting section is mounted on the lifting link device, the balance weight 40
As shown in FIG. 4, the front bumper 6 is configured to be hooked. In this case, the weight holder 42 must be removed from the hitch and stored somewhere. However, this point can be solved by making the bumper 6 itself into the shape of a weight holder and removing the entire bumper and attaching it to the hitch. I do.

Further, in order to use a paddy field working vehicle generally used as a rice transplanter for other purposes, the planting section is removed and a boom sprayer or a granulator is attached. An operation unit for performing boom bending and the like is required, but the operation unit is easy to operate if it is located behind and behind the seat.

However, if the operation unit is always installed behind and behind the seat, it may hinder replenishment of seedlings during rice planting, and may overlap with the position of the tank when using a boom sprayer.

Therefore, the body frame 5a behind the seat
Next, a base bracket 50 that fits in the width of the seat 7 as shown in FIG.
The extension bracket 52 can be fixed so that the position of the extension bracket 52 can be changed by a plurality of screw holes 50a provided in the “0”. The work implement operation box 5 is mounted on the extension bracket 52.
4 is attached.

When the planting section is mounted or the boom sprayer 60 is mounted, the extension bracket 52 is fixed at the center position as shown in FIGS. 8 (a) and 8 (b).

On the other hand, as shown in FIGS. 9A and 9B,
A granulator 70 that does not require a tank to be installed next to the seat
In this case, the extension bracket 52 is extended and fixed in the right or left direction so as to be easily operated.

As described above, since the position of the operation unit can be changed in accordance with a specific work machine, the operation unit can be used at a position where it does not interfere, and basically, it is not necessary to remove the operation unit. In addition, since the operation box is arranged at the position of the pivot of the lifting link behind the seat, wiring, wire setting, and the like are facilitated.

[0036]

As described above, according to the present invention,
Extends around the shaft support part as the lifting link device moves up and down
Since the PTO shaft is swingably supported , it can be driven within the allowable bending angle range of the drive shaft even if the PTO shaft is higher than the working machine position, and in the case of a working machine such as a boom sprayer. However, the vertical adjustment range of the working machine can be widened according to the growing condition of the crop.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a PTO device of the present invention, showing a state where a lifting link is lowered.

FIG. 2 is a diagram illustrating a state where a lifting link is raised.

FIG. 3 is a plan view of a main part of the PTO device shown in FIG.

4A and 4B show a paddy field work vehicle, wherein FIG. 4A is a plan view and FIG. 4B is a side view.

FIGS. 5A and 5B show a state in which the work implement of the paddy field work vehicle is removed and a balance weight is attached, wherein FIG. 5A is a plan view and FIG. 5B is a side view.

6A and 6B show a state in which a balance weight is hooked on a weight holder, wherein FIG. 6A is a side view and FIG. 6B is a perspective view.

FIG. 7 is a perspective view showing an operation unit of the work machine.

FIG. 8 is a diagram illustrating a position of an operation unit when the working machine is a boom sprayer.

FIG. 9 is a diagram showing the position of the operation unit when the working machine is a granulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paddy field work vehicle 15 Elevating link 20a PTO shaft 20b PTO shaft 22 Drive shaft 23 Joint 25 Shaft support 26 Holder 29 Rod (connecting member)

Claims (1)

(57) [Claims] (1) A lift link device at a rear portion of a paddy field work vehicle.
PTO shaft, drive shaft, etc.
PTO of a paddy working vehicle that transmits the power of the engine through the
In the device, at the tip of the PTO shaft, Axis fixed to the body frame
Attached via bearingFittingWhen,  The joint's bending point is rotatably supported.DoA shaft support, and the shaft supportAt which the joint is connected to the PTO shaft by the joint.
Extended PTO shaft,  TheExtension PTO shaft, Rotatably supported by the shaft support
HolderThroughA column pivotally connected to the lifting link device
Binding memberAnd,With the lifting and lowering of the lifting link device, the shaft support portion
And the extended PTO shaft was swingably supported,  A PTO device for a paddy field working vehicle, characterized in that: