JPS622761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile agricultural work machine that performs traveling work by attaching various work devices to the rear of the mobile machine via a three-point link mechanism, and particularly relates to a work device that follows its own weight to the ground. For example, a mower, an earth removal blade, a rake, a harrow, a ridge coating device, etc. are connected to each other so that they can swing laterally and can be moved up and down.

Conventionally, working equipment connected using a three-point linkage mechanism was only raised and lowered by the operation of the lift arm of the mobile machine, and movement in the lateral direction was prevented. When traveling while moving, the working equipment behind the rear wheels of the mobile aircraft would move laterally away from the path of the mobile aircraft due to the change in attitude of the mobile aircraft, requiring careful maneuvering. In particular, when traveling between trees, the rear working device was likely to hit the trees. In addition, if a working device that follows ground contact is directly connected to the three-point link mechanism and rotated, the working device will receive a large lateral load, which may cause the three-point link mechanism or the working device to deform or break. It was a lot.

It is also known that a working device is pivotally connected to the rear hitch of the mobile body using a vertical pin and the work device is simply towed. In this case, the above-mentioned problems associated with turning the mobile body do not occur. However, since the working equipment cannot be raised and lowered freely, the types of working equipment that can be connected are limited.

The present invention has been made in view of the above-mentioned circumstances, and includes an attachment connecting structure connected to the rear part of a mobile body via a three-point link mechanism so as to be freely raised and lowered,
A connecting member fixed to a ground-following type working device is pivotally supported on the attachment connecting structure so as to be swingable about a vertical axis and a horizontal axis, and At a position closer to the work equipment than the swing pivot shaft, by contacting with a connecting member, the range of left and right swinging of the work equipment around the vertical axis and the range of downward swing around the horizontal axis are controlled. A regulating frame member is installed on the attachment connecting structure, and a contact surface of the frame member with the connecting member is formed into an inclined surface that slopes downward toward an intermediate position of the horizontal swing range of the connecting member. It is characterized by

In other words, according to the present invention, the working device can swing up and down and left and right with respect to the moving machine, and can follow the moving machine in a posture along the passing route even when the moving machine is traveling around, even in a work area with a curved route. As long as the worker can maneuver the desired work route without being distracted by the work equipment behind him, the work equipment can appropriately follow the trajectory and perform the desired work. In addition, even if a lateral load is applied to the working equipment when the mobile body rotates, the working equipment will swing laterally, so the three-point linkage mechanism and the working equipment will not be deformed or damaged, ensuring safety. It also has the advantage of allowing you to continue working.

Furthermore, although the working device can swing up and down as well as left and right as described above, the working device can only swing horizontally and downwardly by coming into contact with the frame member installed on the connecting structure. The range of movement is regulated, and if the connecting structure is raised and lowered at a height that exceeds the range of downward swinging of the working equipment, the working equipment can also be raised and lowered together.

Moreover, when raising and lowering the work equipment, simply placing the frame member against the connecting member fixed to the work equipment and raising and lowering the work equipment while placed on the frame member makes it difficult for the mobile machine to turn and sway from side to side. There is a risk that the working equipment may swing from side to side as a result of the movement, but the contact surface of the frame member with the connecting member is formed into an inclined surface that slopes downward toward the middle position of the horizontal swing range of the connecting member. Therefore, when the connecting member comes into contact with the frame member as it rises, it is guided by its own weight to move along the slope to a position approximately in the middle of the left-right swing range, stably holding the work equipment. I can do it.

Therefore, compared to a simple traction connection, there are more types of attachment work devices that can be connected, and this has the advantage that it can be used effectively for a wide range of work.

Embodiments of the present invention will be described below based on the drawings.

The drawing shows a lawn mower as an example of an agricultural mobile work machine, in which a rotary mower 3 as an example of a work device is connected to the rear of a tractor 1 as an example of a mobile machine via a three-point link mechanism 2. . The three-point linkage mechanism 2 is connected to the tractor 1 as is well known.
One top link 2a and a pair of left and right lower links 2b are pivotally connected to the rear of the transmission case 4.
2b, a pair of left and right lift arms 5, 5, which are mounted on the upper part of the transmission case 4 and driven hydraulically, and the lower links 2b, 2b are connected via lift rods 6, 6, and the lower link 2b , 2b and the axle cases 7, 7, chains 8, 8 with turnbuckles are stretched, and lateral vibration of the three-point linkage mechanism 2 is restricted.

An attachment connecting structure 9 is connected to the rear side of the three-point link mechanism 2. As shown in FIG. 3, this structure 9 includes a lower link 2
It consists of two front and rear cross frames 9a, 9b connected between the rear ends of the top links 2b and 2b, and masts 9c, 9c connected to the rear ends of the top link 2a. The center part of the front cross frame 9a is recessed and bent forward so as to enter between the lower links 2b, 2b, and the mast 9 is bent forward from this central recessed part.
c, 9c are erected, and furthermore, a hitch 10 is fixedly installed in the central recessed part of the cross frame 9a,
This hitch 10 has pin holes 11, 11 for connecting attachments having a vertical axis X formed therein. Further, the rear cross frame 9b is in contact with the connecting member 12 fixed to the rotary mower 3, so that the rotary mower 3
This is an example of a frame member that regulates the swing range of the frame member, the center portion of which is formed to protrude rearward, and a recessed portion a of a constant width is formed in the center portion as shown in the front view of FIG. In addition, sloped surfaces b, b facing the recessed portion a are formed on both sides thereof.

At the front of the mower 3, there are connecting arms 12, 1 as a pair of left and right connecting members that protrude forward.
2 is fixedly installed, and a hit 13 rotatable around a horizontal axis Y is connected with a pin to the front ends of the arms 12, 12. Then, this hitch 13 is the structure
It is configured to be connected to a hitch 10 of No. 9 by a pin so as to be swingable around the vertical axis X. Moreover, idling rollers 14, 14 are mounted on the inner surfaces of the arms 12, 12, and these idling rollers 14, 14 face the upper surface of the rear cross frame 9b. The width of the recessed part a is set so that when it falls, it falls into the central recessed part a and is prevented from rolling from side to side.

The mower 3 has three rotary blades 16 arranged side by side inside a case 15 with an open front, and a belt 17.
The input shaft 19 is configured to be driven by..., and has an input shaft 19 protruding forward from the transmission case 18 on the case 15, and an input shaft 19 protruding rearward from the rear end of the tractor transmission case 4. PTO axis 20
are interlocked and connected via a pair of universal joints 21, 21 and a transmission shaft 22. Further, a cylindrical protective case 23 is placed around the outer periphery of the transmission shaft 22 .

In addition, support arms 25a and 2 are provided at the center of the front part and left and right parts of the rear part of the case 15, and free-rotating ground wheels 24a and 24b, 24b are respectively capable of vertically swinging adjustment.
5b, 25b, and only the supporting brackets 26b, 26b of the free-rotating ground wheels 24b, 24b at the rear are connected to the arm 25.
The ground wheels 24b and 25b are rotatably supported around the vertical axis Z, and the directions of both the ground wheels 24b and 24b can be freely changed.

As is clear from the above explanation, when mowing the grass, the lift arms 5, 5 are swung downward to move the mower 3 between the three free-rotating ground wheels 24a, 24b, 2.
4b on the ground, and from this state the lift arms 5, 5 are lowered a little further. In this way, as shown in FIG .
The posture is further downward than 2 and 12. In this state, the mower 3 can swing vertically and horizontally relative to the tractor 1 about the vertical axis X and the horizontal axis Y, and as shown in FIG. 5, when the tractor 1 is rotated, The mower 3 also swings freely laterally and is pulled along the path of the tractor 1, and also freely follows the contours of the ground. In addition, the horizontal swing range of the mower 3 is the connecting arm 12,
12 is limited to the range in which it can move between both ends of the rear cross frame 9b.

Also, when the lift arms 5, 5 are swung upward, the connecting structure 9 rises, and the rear cross frame 9b supports the arms 12, 12 of the mower 3 from below, and then the subsequent lift arms 5, 5. The mower 3 is lifted as it rises. In this case, when the arms 12, 12 are supported by the rear frame 9b,
Even if the mower 3 were to swing to the left or right, the idle roller 14 of the left or right arm 12 would rest on one slope b of the rear cross frame 9b, so the mower 3 would be under its own weight. It rolls along slope b and moves laterally, as shown by the imaginary line in Figure 4.
Both rollers 14, 14 are stably supported in a depressed position in the central recessed portion a of the rear cross frame 9b. Therefore, the mower 3 lifted from the ground is always stably supported at the center directly behind the tractor 1, and even when the tractor 1 turns, the lifted mower 3 is swung around by centrifugal force and unexpectedly swings sideways. There's nothing to do.

In the embodiment, the mower 3 is used as an example of the ground-following work device, but other devices such as an earth removal blade, a rake, a harrow, a ridge coating device, and a transplanting device can also be used.

[Brief explanation of the drawing]

The drawings show an embodiment of the agricultural mobile working machine according to the present invention, in which Fig. 1 is a partially cutaway side view showing the main parts of the mower, Fig. 2 is a plan view of the main parts, and Fig. 3 is a diagram showing the attachment connection. FIG. 4 is a perspective view showing the structure, FIG. 4 is a sectional view taken along line AA in FIG. 2, and FIG. 5 is a schematic plan view of the entire structure during rotation. DESCRIPTION OF SYMBOLS 1... Mobile body, 2... 3-point link mechanism, 3... Working device, 9 ... Attachment connection structure, 9b...
Frame member, 12... Connection member, X... Vertical axis, Y
...horizontal axis center.

Claims (1)

[Scope of Claims] 1. An attachment connecting structure 9 is connected via a three-point linkage mechanism 2 to the rear of the mobile body 1 so as to be able to rise and fall freely, and a connecting member 12 fixed to a ground-following type working device 3 The attachment connecting structure 9
It is pivotably supported around the vertical axis X and the horizontal axis Y, and is located on the lower side of the connecting member 12 and closer to the working device 3 than the swing pivot axes X and Y. , the attachment connects the frame member 9b, which restricts the horizontal swing range of the working device 3 around the vertical axis X and the downward swing range around the horizontal axis Y by contacting with the connecting member 12. The agricultural mobile working machine is constructed on a construction body 9 , and the contact surface of the frame member 9b with the connecting member 12 is formed into an inclined surface that slopes downward toward the middle position of the horizontal swing range of the connecting member 12. 2. The agricultural mobile working machine according to claim 1, wherein the working device 3 is a mower.