JPS6325924Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for a tilling cover and a rear cover of a rotary tilling device which is attached to the rear of an agricultural tractor and performs tilling, leveling, plowing, etc.

Even in conventional rotary tilling devices, for example, as in the technique described in Japanese Utility Model Publication No. 52-29130, the tilling cover is configured to be rotatable back and forth with respect to the position of the tilling claws, and the rotation of the tilling cover is controlled. The technique of rotating and changing the position in conjunction with the vertical movement of the depth frame is known.

However, in this technology, the rotation of the tilling cover is not caused by the tilling claw shaft, but by being suspended from the bevel gear box of the rotary tilling device. There was a problem in that the purpose of changing the position of the tillage cover, which was to suppress the splashing of soil from the tilling claws in an optimal manner, could not be fully achieved because the rotation trajectory was not changed accurately. be.

In addition, in the conventional technology, the tilling cover and the rear cover are integrally constructed and rotate back and forth, so that the tilling claws release a certain amount of tilled soil backward and even the soil surface. There was a problem in that the rear cover did not flatten the soil, and the rear cover, which was integrated with the tilling cover, carried around the tilled soil.

The purpose of the present invention is to eliminate this problem, and the tilling cover 1, which is freely rotatable back and forth, is loosely fitted around the tilling claw shaft 32, so that even if it is rotated back and forth, the tilling cover 1 can be rotated back and forth. The structure is such that the gap between the claw 6 and the outer circumference of the rotation locus does not change.

In addition, the rear cover 5 follows the tilling cover 1 which adjusts and rotates back and forth, but since the rear cover 5 is pivoted to the rear end of the tilling cover 1, the pivot only moves back and forth. The angle of the rear cover 5 itself with respect to the soil is configured to be independently determined by the relationship between the rear cover hanging rod 7 and the unevenness of the soil,
This solves the problem of the technique described in Japanese Utility Model Publication No. 52-29130, in which the tilled soil is transferred using a rear cover.

Furthermore, the tillage cover 1 is rotated in conjunction with the vertical adjustment rotation of the depth frame 2.
By making the connecting portion on the tilling cover 1 side of the connecting rod 8 that interlocks the tilling cover 1 and the depth frame 2 to be the connecting portion between the tilling cover 1 and the rear cover 5, the pivot shafts of both covers are arranged. It is strong because it is a part of the rear cover 1, and it is strong, and by directly rotating both the tilling cover 1 and the rear cover 5,
It is configured to allow smooth adjustment.

The purpose of the present invention is as described above, and the structure of the present invention will be explained based on the structure of the embodiment shown in the attached drawings.

FIG. 1 is a side view of the rotary tiller of the present invention, and FIG. 2 is a plan view thereof.

A rotary tilling device is attached to the rear of an agricultural tractor, power tiller, etc., and in this example, a rotary tilling device attached to a three-point link type work implement attachment device of an agricultural tractor is shown. . A top link hinge 13 protrudes from the rear part of the rear axle case of the agricultural tractor, and the top link 1 is attached to the top link hinge 13.
4 is provided, and the top link 14 is pivotally connected to the top link mast 12 of the rotary tiller.

Furthermore, two lower links protrude from the rear axle case of the agricultural tractor, and the tips of the lower links are attached to the lower link pivot pins 19L, 19.
It is pivotally connected to R. And top ring 14
It is attached by two lower links and is moved up and down by the lift arm of the agricultural tractor.

A depth frame adjustment device 3 for adjusting the height of the depth frame 2 is interposed between a part of the top link mast 12 and the depth frame 2, and the depth frame 2 can be adjusted by rotating the depth frame adjustment handle 3a. rotates vertically around the pivot pin 2a. The pivot pin 2a is attached to also serve as the mounting plate 17 to which the lower link pivot pin 19 is attached. The mounting plate 17 is attached to the bevel gear box 1.
Main beam 16L, 1 protruding from 0 to both sides
Each is fixedly installed in 6R. main beam 1
A chain case 18 is fixed to the outer end of 6L,
Side frame 3 is attached to the outer end of main beam 16R.
3 is fixed.

In the conventional rotary tilling device, the tilling cover 1, the left plate 1a, and the right plate 1b are fixed to the chain case 18 and the side frame 33, and cannot be moved as one unit, but in the present invention, The tilling cover 1, the left plate 1a, the right plate 1b, and the rear cover 5 are not fixedly attached to these, but are pivotably supported around the tilling claw shaft 32 and are configured to be rotatable.

As shown in FIG. 1, with the rear cover 5 pivotally supported on the tilling cover 1, these covers are suspended by a connecting rod 8 and a rear cover suspension rod 7 to determine their position. Reference numeral 11 denotes a side plate, which is pivotally connected to the rear part of the tilling cover 1 so as to be adjustable. 15
b is a tail wheel vertical rod, 15a is a tail wheel horizontal rod, and 4 is a tail wheel.

Figure 3 shows that the rotary tiller is not moved relative to the agricultural tractor, but the depth frame 2 is 2'
This is a drawing showing the state in which it has been rotated up and down. Such rotational adjustment of the depth frame 2 is performed by rotating the depth frame adjustment handle 3a.

When the depth frame adjustment handle 3a is turned, the depth frame 2 is raised and moved to the position 2'.
Accordingly, the position of the tilling cover 1, which is pivotally connected to the depth frame 2 by the connecting rod 8 and the pivot pin 8a, is pulled up and raised to the position 1'.

The connecting rod 8 is connected to a hanging pin 21a provided on the reinforcing plate 21 on the tillage cover 1 and the depth frame 2 at the upper end.
The pivot pin 8a between the two is connected.

The hanging pin 21a is provided near the pivot points of the tilling cover 1 and the rear cover 5, and suspends and supports the parts that are strong due to the pivot shafts of both covers. Furthermore, since the connecting rod 8 is a pivot point for both covers, the connecting rod 8 can directly move both the tilling cover 1 and the rear cover 5, and smooth adjustment can be performed.

Furthermore, since the upper end of the connecting rod 8 is pivotally supported by the pivot pin 8a on the depth frame 2 in front of the position of the hanging pin 21a, the tilling cover 1 can be rotated back and forth as the depth frame 2 is rotated. The movement is carried out smoothly.

When the depth frame 2 is lowered to the 2' position, the tilling cover 1 is rotated by its own weight and the movement of the rear cover hanging rod and moved to the 1 position. Since the rear cover 5 is suspended between the depth frame 2 and the rear cover suspension rod 7, it moves from the position 5 to the position 5'.

Figure 4 shows the tillage cover 1 and rear cover 5 when the rotary tillage device is moved up and down by the lift arm of the agricultural tractor, and the depth frame 2 is corrected to a horizontal state by the depth frame adjustment handle 3a each time. It is a drawing showing a state.

In the case of a conventional rotary tiller in which the tiller cover does not rotate, the tiller cover 1 and rear cover 5 tilt in the same manner as the chain case 18 rotates.

On the other hand, in the present invention, the tilling cover rotates in conjunction with the movement of the depth frame 2, so the depth frame 2 is rotated by the depth frame adjustment handle 3a.
By adjusting the height of the tilling claw shaft 32, the rear cover 5, and the tilling cover 1,
The height relationship between the two can be adjusted so that the upper surface of the rotary path of the tilling claws is always covered with the tilling cover 1, and the rear surface is always covered with the rear cover.

Figure 5 shows the connecting rod 8 and the reinforcing plate 21 of the tillage cover 1.
FIG. 6 is a partial sectional view of the rear side.

The connecting rod 8 may be a telescopic rod or a turnbuckle device, as long as it can stop the tilling cover 1 from rotating beyond a certain level with respect to the depth frame 2. 8a and 21a are pivot pins.

FIG. 7 is a side view of a device whose length can be adjusted by a turnbuckle device 25 instead of the connecting rod 8;
FIG. 8 is a drawing showing an embodiment of the length adjusting device;
The figures are a rear view of Fig. 8, Fig. 10 is a drawing showing an embodiment of the length adjustment device using a turnbuckle device, Fig. 11 is a drawing showing the handle 25d part of Fig. 10, and Fig. 12 is another embodiment. FIG. 13 is a rear view of the adjustment nut portion.

By using a turnbuckle-type length adjustment device for the connecting rod 8 as in the embodiment shown in FIG. 7, the tilling cover 1 can be adjusted back and forth without moving the depth frame 2 up and down. It can be rotated.

With this configuration, when tilling carbide ground, the tilling claws do not penetrate deeply, so the rear cover 5
When the rear cover 5 is lowered and the tiller claws reach the bottom, such as during puddling work, the rear cover 5 can be raised to the 5' position.

8 to 13, 25d is the handle of the turnbuckle device, 25c is the nut, 25
e is a male screw tube, and 25d is a turnbuckle male screw.

FIG. 14 is a rear sectional view showing the power transmission structure of the rotary tiller.

Power is transmitted from the PTO shaft 22 of the agricultural tractor to the input shaft 23 of the bevel gearbox 10 through a universal joint, and the bevel gearbox 1
Power transmission shaft 2 via bevel gears 26 and 27 in 0
Power is transmitted within the main beam 16L at 8.

A sprocket 29 is fixed to the end of the power transmission shaft 28, and power is transmitted to the sprocket 30 by a chain inside the chain case 18. The sprocket 30 is fixed to the tilling shaft 31, and connects a bracket 31a at the end of the tilling shaft 31 to a bracket 32a of the tilling claw shaft 32, thereby rotating the tilling claw shaft 32 and the tilling claw 6.

A side frame 33 is fixed to the tip of the right main beam 16R, and a bearing case 39 is fixed to the tip of the side frame 33.

FIG. 15 is a sectional view showing the lower part of the chain case 18, and FIG. 16 is a side view thereof.

A wear prevention cover 34 is fixedly provided to cover the lower surface of the chain case 18, and a wrapping prevention plate 36 is provided fixedly to the bracket 31a on the tilling claw shaft side. The wrapping prevention plate 36 rotates together with the tilling shaft 31, and a wrapping prevention plate 35a on the chain case 18 side is provided to protrude from the outer periphery of the plate 36 to prevent straw from entering. In this embodiment, the winding prevention plate 35a on the side of the chain case 18 is fixed to the chain case 18, and the tilling cover attachment body 45 is loosely fitted to the outer peripheral plate 35b of the winding prevention plate 35a. A left plate 1a is fixed.

In this way, the left plate 1a of the tilling cover 1 uses the outer peripheral plate 35b of the wrapping prevention plate 35a as a bearing.

FIG. 17 is a rear sectional view of the side frame 33 portion, and FIG. 18 is a side view thereof.

A bearing case 39 is fixed to three mounting holes below the side frame 33 via bolts 43.

A tilling shaft 37 is supported by a bearing 46 and an oil seal 49 in a bearing case 39.

The tilling shaft 37 is integrated with the tilling shaft 32 by welding, so after inserting the tilling shaft 37 into the bearing 46, the bearing pad 47 is tightened with the pad bolt 48, and the tilling claw shaft 32, the tilling shaft 37 bearing 4 are tightened.
6. The oil seal 49 and bearing case 39 are integrated. 38 is a lid body.

A large diameter arcuate surface 39a is formed on the upper surface of such a bearing case 39, and conversely, a large diameter arcuate surface 40a is formed on the lower surface of the tilling cover attachment body 40 on the right side.
Both sides are in contact to form a bearing surface. The right plate 1b is fixed to the upper part of the tilling cover attachment body 40.

Since the tilling cover mounting body 40 is only in the upper half, the U-shaped fitting 41 is applied from below to the bearing case 3.
It is configured to loosely fit around the entire circumferential surface of 9 with a tightening tool such as a bolt 42.

As described above, the present invention extends the left plate 1a and right plate 1b fixed to the tilling cover 1, and the tilling claw shaft 32
, and the tilling cover 1 is loosely fitted around the tilling claw shaft 32.
In a configuration in which the rear cover 5 is vertically rotatable at the rear end of the tilling cover 1 and the rear cover 5 is rotatable back and forth around the rear end of the tilling cover 1, a hanging pin is provided near the pivot point between the tilling cover 1 and the rear cover 5. The upper end of the connecting rod 8 whose lower end is pivotally supported on the hanging pin 21a
Pivot pin 8 of the depth frame 2 forward of the position
a, and the upper end of the rear cover hanging rod 7, which is pivoted to the rear end of the rear cover 5, is pivoted at a position rearward from the pivot pin 8a of the depth frame 2, and has the following effects. It is.

First, always depth frame adjustment handle 3a
By adjusting depth frame 2 with
The positions of the rear cover 5 and tillage cover 1 can be moved to their normal positions with respect to the ground surface, and even when the rotary tillage device is used at a low position relative to the agricultural tractor, it can be moved to a high position. Even when used, the tillage cover and rear cover can always be in the normal position relative to the ground surface, regardless of the inclination of the chain case, etc., and can be used to cover scattered soil and mud from tillage and to level the tilled soil. can be performed normally.

Second, the conventional technology described in Japanese Utility Model Publication No. 52-29130 has a problem in that as the tilling cover 1 rotates back and forth, the gap between it and the rotation locus of the tilling claws 6 changes. However, in the present invention, the tilling cover 1 is freely rotatable back and forth and is loosely fitted around the tilling claw shaft 32, so that even when it is rotated back and forth, it does not follow the outer circumference of the rotation trajectory of the tilling claws 6. The structure is such that the gap between them does not change.

Thirdly, the rear cover 5 also follows the tilling cover 1 which adjusts and rotates back and forth, but since the rear cover 5 is pivoted to the rear end of the tilling cover 1,
The pivot portion only moves back and forth, and the angle of the rear cover 5 itself with respect to the soil is determined independently by the rear cover hanging rod 7.
This method solves the problem of the technique described in Japanese Utility Model Publication No. 52-29130, in which the tilled soil is carried around by the rear cover.

Fourthly, the tillage cover 1 is rotated in conjunction with the vertical adjustment rotation of the depth frame 2.
By making the connection part on the tillage cover 1 side of the connecting rod 8 that interlocks the tillage cover 1 and the depth frame 2 in the vicinity of the pivot part between the tillage cover 1 and the rear cover 5, the pivot shaft of both covers can be adjusted. Since it is a certain part, it is strong, and by directly rotating both the tilling cover 1 and the rear cover 5,
It is designed to allow smooth adjustment.

[Brief explanation of the drawing]

Figure 1 is a side view of the rotary tiller of the present invention, Figure 2 is a plan view of the same, and Figure 3 is a diagram showing the depth frame rotated up and down without moving the position of the rotary tiller relative to an agricultural tractor. , Figure 4 shows the tilling cover 1 and the rear cover when the rotary tilling device is moved up and down by the lift arm of an agricultural tractor, and the depth frame 2 is corrected to a horizontal state each time by the depth frame adjustment handle 3a. Drawing showing the state of 5,
Figure 5 is a side view of the connecting rod and the reinforcement plate of the tillage cover.
Fig. 6 is a partial sectional view of the rear side, Fig. 7 is a side view of a device that can be lengthened or shortened by a turnbuckle device instead of a connecting rod, Fig. 8 is a drawing showing an embodiment of the length adjustment device, and Fig. 9 is a drawing showing an embodiment of the length adjusting device. 10 is a drawing showing an embodiment of a length adjustment device using a turnbuckle device, and FIG. 11 is a handle 25d of FIG. 10.
FIG. 12 is a drawing showing another embodiment. FIG. 13 is a rear view of the adjustment nut.
Figure 4 is a rear sectional view showing the power transmission structure of the rotary tiller, Figure 15 is a sectional view showing the lower part of the chain case, Figure 16 is a side view, and Figure 17 is a rear sectional view of the side frame portion. FIG. 18 is a side view as well. 1... Tilling cover, 1a... Left plate, 1b... Right plate, 2... Depth frame, 3... Depth frame adjustment device, 5... Rear cover, 6... Tilling claw,
8... Connection rod, 8a... Pivot pin, 21a... Suspension pin, 32... Tilling claw shaft.

Claims (1)

[Scope of utility model registration request] The left plate 1a and the right plate 1b fixedly attached to the tilling cover 1 are extended and loosely fitted around the tilling claw shaft 32, so that the tilling cover 1 can be rotated back and forth around the tilling claw shaft 32, In a configuration in which a rear cover 5 is vertically rotatable at the rear end of the tilling cover 1, a connecting rod whose lower end is pivoted on a hanging pin 21a provided near a pivot point between the tilling cover 1 and the rear cover 5. 8 is pivoted to the pivot pin 8a of the depth frame 2 forward of the position of the hanging pin 21a, and the upper end of the rear cover hanging rod 7 pivoted to the rear end of the rear cover 5 is pivoted to the pivot pin 8a of the depth frame 2. A rotary tiller for an agricultural tractor, characterized in that the rotary tiller is pivoted at a position rearward of the pin 8a.