JPH09163803A - Rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a rotary tiller having a tilling rotary laid at a side of a transmission case and composed of a main claw shaft cylinder and an auxiliary claw shaft cylinder reversely rotating from each other to stably perform driving force transmission to the tilling rotary. SOLUTION: This rotary tiller has an inputting sprocket 7 engaged with a chain transmission mechanism 2 and, in the vicinity of the inputting sprocket 7, a tension mechanism 26 is provided to give a tension to a chain 6 to enlarge a winding angle of the chain 6 to the inputting sprocket 7. Further, the inputting sprocket 7 is engaged with a winding outer peripheral side of the chain transmission mechanism 2 to enable the inputting sprocket 7 to be combinedly used also as the chain tensioning mechanism 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a cultivating rotary supported laterally on a transmission case, which comprises a main claw shaft cylinder and a sub-claw shaft cylinder rotatable independently of each other. The main claw shaft cylinder and the sub-claw shaft cylinder are rotationally driven in opposite directions by a chain transmission mechanism housed in the transmission case and a reverse rotation transmission mechanism whose input portion is a sprocket meshing with the chain of the mechanism. The present invention relates to a rotary cultivator.

[0002]

2. Description of the Related Art Rotary cultivators of this type are, for example,
It is known from Japanese Patent Publication No. 46-39041.
In the prior art, the input sprocket of the reverse rotation transmission mechanism is provided on the chain inner circumference side of the chain of the chain transmission mechanism.

[0003]

In the conventional apparatus, since the input sprocket of the reverse rotation transmission mechanism is provided on the inner circumferential side of the chain of the chain transmission mechanism, the winding angle of the chain on the sprocket cannot be made large. Then, when the chain pulsates due to the impact load caused by driving the tillage rotary into the soil, there is a problem that the tooth jump of the chain occurs and the driving force transmission to the sprocket becomes unstable.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a means for ensuring a large wrapping angle of a chain around an input sprocket of a reverse rotation transmission mechanism is provided to ensure stable power transmission to the sprocket. There is.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment will be described with reference to the drawings. In FIG. 3, a cultivator (T) is equipped with a mission case from an engine (9) mounted on a frame extending from a mission case. Power is transmitted to the axle under the mission case via a transmission device in the chassis, and the wheels (10) fitted to the axle are rotationally driven to travel, and the driving operation is postponed from the mission case. It is configured to be carried out at the handle portion of the steering handle (11). A rotary tiller (R) can be detachably attached to the rear part of the mission case.

[0006] The rotary tiller (R) is a mission cage.
Transmission case that is mounted in conjunction with the power take-out section
(1), a cultivating rotary (R1) horizontally supported on the lower part of the transmission case (1), and a rear part of a beam extending from the upper part of the transmission case (1) A tail wheel device (12) for setting the working depth,
It consists of a cultivating cover (13), etc.
A cultivating shaft (3), which is one of the compositional elements of the cultivating rotary (R1), is supported horizontally at the lower end of the soot (1) horizontally with respect to the traveling direction, and the cultivating shaft (3) is transmitted. The chain transmission mechanism (2) housed in the case (1) is driven in a desired rotation direction.

The chain transmission mechanism (2) includes the transmission case.
A drive sprocket (14) mounted on the upper part of (1) and a passive sprocket (1) wedged on the central part of the cultivating shaft (3).
5) and a chain (6) are hung around it to rotate the tiller shaft (3) counterclockwise (A).

Further, the cultivating shaft (3) is projected from the transmission case (1) to the left and right, and the main claw shaft tube (4) is located near the projecting end.
(4) are mounted directly, and they are driven to rotate in the same direction as the cultivating shaft (3). The outer surface of each main claw shaft cylinder (4) is provided with a cultivating claw (16). It is fastened in an array, and these plowing claw groups are driven into the soil by down-cut rotation (D).

On the other hand, the auxiliary pawl shaft holder (17) having inclined outer diameter portions which are inclined at a constant angle with respect to the axis of the cultivating shaft (3) is provided on both left and right sides of the transmission case (1). (17) is provided, and sub-claw shaft cylinders (5) and (5) are rotatably bearing-mounted on the respective inclined outer diameter portions, and each sub-claw shaft cylinder (5) is connected to the chain transmission mechanism (2). The reverse rotation transmission mechanism (8) (8) interlocking with (4) is driven to rotate in the opposite direction to the main claw barrel (4), that is, in the clockwise direction (B).

Further, the plowing pawls (18) are also provided on the outer peripheral portions of the auxiliary pawl shaft cylinders (5) and (5) which rotate around the shaft center inclined at a constant angle with respect to the shaft center of the tilling shaft (3). The plow claws are mounted in an arrangement of (1) and are driven obliquely into the soil directly below the transmission case (1) by the upcut rotation (U).
(24) is the tip turning locus of the tilling claw fixed to the main claw shaft cylinder,
(25) shows the tip turning locus of the tilling claw fixed to the sub-claw shaft cylinder.

The reverse transmission mechanism (8) (8) is the same as the chain (6).
The input sprocket (7) that meshes with the inner circumference of the slack side of the
The rotation shaft (19) on the right and left sides of (7) has a gear (20) (2).
0) is wedged, and each gear (20) (20) is cultivated.
It is rotatably fitted on (3) and has auxiliary claw shaft holders (17) (17)
The driven gear (21) (2) which is rotatably supported by the inner diameter of the
1) is constantly meshed to form an interlocking part for the chain transmission mechanism (2), and by this interlocking part, the counterclockwise (A) rotational power of the rotary shaft (19) is converted to the clockwise (B) rotational power. It is configured to be changed and transmitted to the driven gears (21) (21).

Gears (22) and (22) are provided at the outward extension ends of the bosses of the driven gears (21) and (21), respectively.
Each gear (22) (22) is engaged with a receiving gear portion (23) (23) formed in the inner diameter portion of the sub-claw shaft cylinder (5) (5) to form a refraction transmission portion, and a refraction transmission portion is formed. Transmission (22) (23), (22)
With the power transmitted via (23), the sub-claw shaft cylinder (5) (5)
Is rotationally driven in the direction (B) opposite to that of the main claw shaft cylinders (4) and (4).

Further, a chain tensioning mechanism (26) having an idler (27) which is engaged from the outside of the chain (6) on the slack side of the chain (6) near the portion wound around the input sprocket (7).
Is provided so that the slack side of the chain (6) is pressed from the hanging outer peripheral side to be tense.

The chain tension mechanism (26) of the embodiment is
A pivot shaft (28) that pivotally supports the idler (27) on the tip.
Is fitted in a support cylinder (29) provided in the transmission case (1) so as to be able to move back and forth, and its support shaft (28) is attached to an idler (27).
Spring (30) in the direction that is pressed against the chain (6)
The automatic tension structure is not limited to the one shown in the figure, but various modified structures can be adopted, and the chain tension mechanism is automatically tensioned. Instead of the structure, it may be provided with an operation adjusting structure that can adjust tension and relaxation as needed.

4 and 5 show another embodiment of the present invention. This embodiment is different from the embodiment of FIGS. 1 to 3 (hereinafter referred to as the former embodiment) in the reverse rotation transmission mechanism ( 8) Only a part of (8) is different, and the other parts are substantially the same as the former embodiment. Therefore, the same reference numerals are used for the parts common to the former embodiment, but they are different from the former embodiment. Only the part to be explained is explained.

In the embodiment of FIGS. 4 and 5, the rotary shaft
The input sprocket (7) wedged to (19) is attached to the chain.
The input sprocket (7) meshes with the slack side hanging outer circumference of (6), and also serves as a chain tensioning mechanism for pressing and tensioning the chain (6) from the hanging outer circumference side, while also functioning as the tiller shaft. The rotational force in the direction (B) opposite to the rotational direction (A) in (3) is transmitted to the rotary shaft (19).

Then, at the left and right sides of the input sprocket (7), another sprocket (31) (3) is attached to the rotary shaft (19).
1) is wedged, and a driven sprocket (32) (3) corresponding to the driven gear of the former embodiment is provided on the side of the cultivating shaft (3).
2) is provided, and the left and right sprockets (31) (32), (3
Chains (33) and (33) are respectively wound around 1) and (32) to form an interlocking portion of the reverse transmission mechanism (8) (8) with respect to the chain transmission mechanism (2).

[0018]

The present invention is carried out in the form described above, and has the following effects.

An input sprocket (7) is meshed with the inner circumference of the chain (6) of the chain transmission mechanism (2) to form the chain transmission mechanism (8) (8), and the input sprocket of the chain (6) is formed.
The chain tensioning mechanism (26) presses and tensions the vicinity of the part wound around (7) from the outer circumference side of the chain, so that the winding angle of the chain (6) with respect to the input sprocket (7) is increased. As a result, the driving force is transmitted to the input sprocket in a stable manner.

The input sprocket (7) is meshed with the chain outer periphery of the chain (6) of the chain transmission mechanism (2) to form the reverse transmission mechanism (8) (8), and the input sprocket (7) is formed. Is a chain tension mechanism that hangs the chain (6) and presses and tensions it from the outer peripheral side.
By also functioning as (26), the winding angle of the chain (6) with respect to the input sprocket (7) becomes large, and the chain transmission mechanism adjacent to the input sprocket (7)
The winding angle of the chain with respect to the sprocket of (2) is also increased, and the stability of the power transmission of both the reverse rotation transmission mechanism (8) (8) and the chain transmission mechanism (2) can be improved, while the input sprocket (7) is connected to the chain. Since it also serves as a tension mechanism, the overall structure is simplified.

[Brief description of the drawings]

FIG. 1 is a development view of a transmission cross section showing a main structure of a device of the present invention.

FIG. 2 is a schematic side view of the transmission structure of the device of the present invention.

FIG. 3 is an overall side view of a cultivator in which the device of the present invention is implemented.

FIG. 4 is a transmission sectional development view showing another embodiment of the device of the present invention.

5 is a schematic side view of the transmission structure of another embodiment shown in FIG. 4. FIG.

[Explanation of symbols]

 1 Transmission Case 2 Chain Transmission Mechanism 4 Main Claw Shaft Tube 5 Sub Claw Shaft Tube 6 Chain 7 Input Sprocket 8 Reverse Transmission Mechanism 26 Chain Tension Mechanism R1 Tillage Rotary

Claims (2)

[Claims] 1. A cultivating roll laterally mounted on a transmission case (1).
Main claw shaft cylinder (4) that can rotate the tarry (R1) independently of each other
(4) and sub-claw shaft cylinders (5), (5)
(4) A chain transmission mechanism (2) in which the auxiliary claw barrel (5) and (5) are housed in the transmission case (1) and a chain of the mechanism (2).
The sprocket (7) meshing with (6) and the reverse rotation transmission mechanism (8) and (8) having the input portion rotate in opposite directions to each other.
In a tarry cultivator, a reverse rotation transmission mechanism in which the input sprocket (7) is meshed with the hanging inner peripheral side of the chain (6).
(8) The input sprocket of the chain (6) composed of (8)
A rotary tilling device in which the vicinity of the portion wound around (7) is pressed and tensioned by the chain tensioning mechanism (26) from the outer circumference side of the winding. 2. A cultivating roll laterally mounted on a transmission case (1).
Main claw shaft cylinder (4) that can rotate the tarry (R1) independently of each other
(4) and sub-claw shaft cylinders (5), (5)
(4) A chain transmission mechanism (2) in which the auxiliary claw barrel (5) and (5) are housed in the transmission case (1) and a chain of the mechanism (2).
The sprocket (7) meshing with (6) and the reverse rotation transmission mechanism (8) and (8) having the input portion rotate in opposite directions to each other.
In the tarry cultivator, the reverse rotation transmission mechanism is provided by engaging the input sprocket (7) with the hanging outer peripheral side of the chain (6).
(8) A chain tensioning mechanism composed of (8), in which the input sprocket (7) hangs the chain (6) from the outer peripheral side around which the chain is pressed.
(26) A rotary tiller that doubles as a device.