JPH08308304A - Grass and straw-twining inhibitor in partially reverse-rotating rotary - Google Patents

Abstract

PURPOSE: To provide a grass and straw-twining inhibitor in a partially reverse- rotating rotary which is increased in durability without damage of the seal group by mounting a dust cover for the outer surface and the outer periphery of the first tilling cylinder at its outside end so that the cover rotates in the opposite direction to first tilling cylinder. CONSTITUTION: The first tilling cylinder R1 arranged at the side of the drive case and the second tilling cylinder R2 arranged at the outer side of the first one are rotated in the opposite directions to each other with the ordinarily rotating driving mechanism D1 and the second reversely rotating driving mechanism D2. In addition, a dust cover 2 is set to cover the outer surface and the outer periphery of the first tilling cylinder at its outer end so that it rotates in the opposite direction to that of the first cylinder. It is preferred that the center hole which has a projection to be connected to the spline 3a of the driving shaft 3 as a constitution component of the reversely rotating driving mechanism D2 is opened on the dust cover 2 and the center hole is inserted to the spline 3a to link the spline to the projection to rotate the dust cover 2 in the opposite direction to the first tilling cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed so that a first tillage tube disposed at a lateral side portion of a drive case and a second tillage tube disposed at an outer side portion thereof rotate in mutually opposite directions. The invention relates to a device for preventing winding of straw in a partially reversing rotary configured as described above.

[0002]

2. Description of the Related Art A first cultivating cylinder in which a cultivating rotary shaft supported on the lower part of a drive case is installed slantingly on the lateral side of the case, and a first cultivating cylinder is horizontally arranged on the outer side of the first cultivating cylinder. A rotary tillage type rotary consisting of two tillers is known, but in this type, the first tiller has a larger diameter than the second tiller and its outer end is Since the seal part that seals the side is easily damaged by wrapping of grass straw or the like, the dust cover that covers the outer end side of the first tiller is provided between the inner end of the second tiller and the dust cover. It is generally provided to prevent wrapping of grass straw or the like and protect the seal portion.

[0003]

By the way, in the above-mentioned general rotary tillage type rotary, both the first and second tillage tubes and the dust cover rotate integrally in the same direction, Since there was no difference in rotation between the individual items, it was less likely that grass or the like would be wrapped around the first tillage tube or the like and tightened due to the difference in rotation.
Although the protection function by the has been achieved to an almost satisfactory extent, in the case of a partial reversing rotary that rotates the first and second cultivating tubes in opposite directions,
Inevitably there will be a difference in rotation between the two tillers.

Therefore, the dust cover mounted between the two tillers rotates in the same direction as the first tiller or in the same direction as the second tiller. When the dust cover rotates in the same direction as the first tiller, the grass straws and the like entwined with the large diameter first tiller are pushed toward the second tiller side and strongly wrap up, enlarging and expanding. When the dust cover rotates in the same direction as the second tillage tube, the occurrence of such a problem that the inside of the dust cover and the first tillage tube intrude inwardly becomes particularly remarkable. It was clarified by the actual work experiment that the value of γ was reduced as much as possible.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above experimental results. The first tillage tube is provided at the lateral side of the drive case, and the first tillage tube is provided at the outside thereof. Partial reverse rotation with the second tiller rotating in opposite directions
Provided is a device for preventing winding of grass straws, which ensures that a dust cover mounted on a portion between both the first and second tillage tubes is always rotated in the opposite direction with respect to the first tillage tube in the tarry. It is a thing. And, as one embodiment, the second
Dust cover on the spline part of the drive shaft that drives the tiller
The center hole of the above is engaged with the projection to surely rotate the dust cover in the opposite direction with respect to the first tiller.

[0006]

In the partially reversing rotary in which the device for preventing wrapping of straw according to the present invention is implemented, the dust cover rotates together with the second tiller, and is always surely opposite to the first tiller. Since it rotates in the direction, the grass straws that are entangled in the first tillage tube are pushed toward the second tillage tube side and strongly wind and expand, and the grass straws and the like are crevices between the dust cover and the first tillage tube. Since it does not intrude into the inside of the first tillage tube from above, a good protection function is exhibited without damaging the seal group on the first tillage tube side.

When the central hole of the dust cover is fitted in the spline portion of the drive shaft for driving the second tiller by projectingly engaging it, the fastening portion of the dust cover is simple and is not exposed to the outside. The dust cover can be reliably rotated in the desired direction, and the attachment of the dust cover does not apply lateral pressure to the seal group in the first tillage cylinder, thus impairing their durability. There is no way to make it.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a rear view of an essential part showing a cross section of a right half portion of a partial reversing rotary according to the present invention. 2 is an enlarged cross-sectional view of a part of the partial reversing rotary, FIG. 3 is a partially cutaway side view showing a dust cover extracted, and FIG. 4 is a walking type tillage equipped with the partial reversing rotary according to the present invention. It is a side view of a machine.

First, the overall structure of the walk-type cultivator will be described with reference to FIG. 4. The walk-type cultivator shown in the figure is an engine mounted on a frame extending from a mission case.
The output of (6) is transmitted to the axle supported on the lower part of the mission case via the transmission mechanism in the mission case so that the wheels (7) and (7) fitted to the axle are driven to rotate. The control handle 8 extends backward from the mission case. Further, a rotary tillage section having a partial reverse rotation rotary can be detachably attached to the rear portion of the mission case.

The rotary tillage section is mounted on the drive case (1) connected to the hitch section of the mission case and the rear end section of the beam extending rearward from the drive case. It consists of a plowing depth gauge (9) and a plowing cover (10).
At the lower part of the drive case (1), a partial reversing roller according to the present invention is provided.
Tari is installed.

The partial reverse rotary is a drive case (1).
The first tiller (R1) (R1) located on both left and right sides of the
A center drive type is constructed with the second tillage tubes (R2) and (R2) arranged on the outer side portions of the respective first tillage tubes (R1) (R1). Since the first tiller (R1) and the second tiller (R2) are symmetrical with respect to the drive case (1), in the following, the first tiller (R1) on the right side and the first tiller (R1) Only 2 tillers (R2) will be described.

The first tiller (R1) is a drive case (1).
The bearing (1) is attached to the holder (11) that is connected to the side of the lower part of the
An up-cut tilling claw (14) is detachably attached to a claw seat (13) disposed on the outer periphery of the claw seat (2) so as to be rotatable. In the illustrated embodiment, the first tillage tube (R1) is configured to rotate around an inclined axis (X1) that is inclined lower toward the outside than the horizontal axis (X).

The second tiller (R2) is the holder.
It is wedged to the spline part (3a) of the horizontal drive shaft (3) extending to the outside of the holder (11) through the center hole of (11),
Down-cut tilling claws in the claw seat (15) group arranged on the outer periphery
Each (16) is detachably attached.

The drive shaft (3) having the second tiller tube (R2) wedged therein is driven by the forward drive mechanism (D1), and the first tiller tube (R1) is driven by the reverse drive mechanism (D2). Then the second tiller
(R2) down-cut tilling claw (16) is rotated in the down-cut direction, and the first tillage tube (R1) is configured to rotate in the up-cut direction, and the forward rotation drive mechanism (D1)
The reverse rotation drive mechanism (D2) is configured as follows.

The forward rotation drive mechanism (D1) is a drive case.
The sprocket (not shown) of the input shaft installed on the upper part of (1), the passive sprocket (17) wedged to the central part of the drive shaft (3), and the chain that is hung on both sprockets.
(18), the drive shaft (3) is rotationally driven in the forward direction by the engine power that is passive to the sprocket of the input shaft.

The reverse rotation drive mechanism (D2) has a drive shaft (3).
Is fitted on the intermediate shaft (19) parallel to the
8) the intermediate sprocket (20), the drive gear (21) wedged to the intermediate shaft (19) at the side of the intermediate sprocket (20), and the state in which the drive gear (21) always meshes Reversing gear (22) which is idly supported on the drive shaft (3) by
And the transmission joint (23) fitted to the outer end portion of the boss portion of the reversing gear (22) and the teeth of the transmission joint (23) as the internal teeth for meshing with each other, the first tiller tube (R1) Passive part formed in
(24) and the first tiller (R1), the drive shaft
(3) and the second tillage tube (R2) are rotationally driven in opposite directions.

(25) is a needle bearing, (2)
6) (27) is an oil seal, (28) is the first tiller (R1)
Oil seal for sealing the inner end side of the, (29) is the first tiller
A flexible seal for sealing the outer end side of (R1).
A dust cover (2) is provided on the outer side of the first tiller (R1) to protect the rule (29).

The dust cover (2) is made into a bowl-shaped body by press molding, and the peripheral flange portion is spherical with the intersection of the horizontal axis (X) and the tilt axis (X1) as the center. It is shaped to cover the outer periphery of the outer end of the first tillage tube (R1) formed on the surface. And a protrusion that engages with the spline portion (3a) of the drive shaft (3) at the center of the bowl-shaped body.
The central hole (5) with (4) ... is opened, and the central hole (5)
Is fitted into the spline portion (3a) of the drive shaft (3) and is prevented from coming off by the ser clip (30), and the second tiller (R2) is attached to the spline portion (3a) outside the dust cover (2). ) Is inserted and fixed, and the dust cover (2) causes the drive shaft (3) and the second tiller (R
With 2), it rotates in the opposite direction to the first tiller (R1).

The specific engagement structure for rotating the dust cover (2) together with the drive shaft (3) and the second tillage tube (R2) is not limited to the above-mentioned spline engagement. In addition to the illustrated embodiment, various structures can be adopted, such as integrally connecting the dust cover (2) and the second tillage tube (R2) with engaging claws and pins.

[Brief description of drawings]

FIG. 1 is a rear view of an essential part showing a cross section of a right half portion of a partial reversing rotary according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a part of the partial reversing rotary.

FIG. 3 is a partially cutaway side view showing a dust cover extracted.

FIG. 4 is a side view of a walk-behind cultivator having a partial reversing rotary according to the present invention.

[Explanation of symbols]

 1 Drive Case 2 Dust Cover 3 Drive Shaft 3a Spline 4 Protrusion 5 Center Hole D1 Forward Drive Mechanism D2 Reverse Drive Mechanism R1 1st Cultivator R2 2nd Cultivator

Claims (2)

[Claims] 1. A forward rotation drive mechanism comprising a first tillage tube (R1) arranged at a lateral side portion of a drive case (1) and a second tillage tube (R2) arranged at an outer side portion thereof. D1) and reverse rotation drive mechanism (D
2) In the partial reversing rotary for rotating in the opposite directions with respect to each other, the dust cover (2) covering the outer surface and outer periphery of the outer end of the first tiller (R1) is replaced with the first tiller (R1). )
1. A device for preventing wrapping of straw in a partially reversing rotary, which is provided so as to rotate in the opposite direction to. 2. A projection (4) which engages with a spline portion (3a) of a drive shaft (3) which is a component of the reverse rotation drive mechanism (D2).
A center hole (5) provided with is formed in the dust cover (2), and the center hole (5) is fitted into the spline part (3a) to engage the spline part (3a) with the protrusion (4). The device for preventing wrapping of straw in a partially reversing rotary according to claim 1, wherein the dust cover (2) is rotated in the opposite direction with respect to the first tiller (R1).