JPH0610721Y2 - Transmission case attachment structure of rotary cultivator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] According to the present invention, the upper end side of a rotary side transmission case in which a tilling rotary is rotatably attached to a lower end side around a horizontal axis is fixed to a traveling body. It is mounted on the machine side transmission case so as to be rotatable around the vertical axis, and the input shaft of the rotary side transmission case is arranged concentrically with the vertical axis and at the same time, it is rotatable about the horizontal axis of the machine side transmission case. Relating to the structure of the transmission case mounting part of the rotary cultivator, which is provided with a lock mechanism that is interlocked with the shaft to lock the rotary side transmission case at the rotational adjustment position and that can be released and released, extending between the rotary side transmission case and the machine side transmission case. .

[Conventional technology]

The rotary cultivator, by adjusting the rotation of the rotary side transmission case with respect to the body side transmission case, switches the drive rotation direction of the cultivating rotary to the forward or reverse direction, or the rotation axis center of the cultivating rotary sideways with respect to the traveling machine body. It is configured to adjust the orientation in the front-back direction or the like.

As a rotary cultivator of this type, a dustproof structure is generally adopted to prevent dust and the like from adhering to the lock mechanism. Conventionally, as shown in Japanese Patent Laid-Open No. 59-151801, there is known a structure in which a dust-proof cylinder part for covering the lock mechanism is arranged on the upper side of the tiller frame which penetrates the rotary side transmission case. There is.

[Problems to be solved by the device]

When the upper structure in which the lock mechanism is arranged on the upper side of the cultivating device frame is adopted as in the above publication, mud is unlikely to be applied, but at a high position, the transmission case is easily worried and large and the position of the center of gravity becomes high. is there.

Therefore, conversely, it is possible to adopt an underlay structure in which the lock mechanism is arranged under the tiller frame, but this has the advantage of lowering the center of gravity position, but it is easy to get mud and the transmission mechanism to the tiller rotary However, each method has its advantages and disadvantages, and there is room for improvement.

An object of the present invention is to provide a transmission case mounting portion structure having advantages of both upper and lower structures by devising the structure of the transmission case including the tiller frame.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is designed so that the upper end side of a rotary side transmission case in which a tilling rotary is rotatably mounted around a horizontal axis is attached to a lower side of the rotary side transmission case to a body side transmission case fixed to a traveling machine body. It is mounted rotatably around the axis, the input shaft of the rotary side transmission case is arranged concentrically with the vertical axis, and the bevel gear is interlocked with the drive shaft rotatable around the horizontal axis of the machine side transmission case. In the structure of the transmission case mounting portion of the rotary cultivator, which is provided with a lock mechanism that allows the release operation to be freely fixed to fix the rotary side transmission case at the rotation adjustment position, across the rotary side transmission case and the body side transmission case,
A pair of left and right tiller frames connected to the traveling machine body are connected to the lower part of the machine body side transmission case at both left and right lateral positions of the lock mechanism, and the left and right pair of left and right machines are connected downward from the machine body side transmission case. Extending legs located before and after the lock mechanism between the tiller frame, to form a dust-proof cylinder portion that covers the lock mechanism from this leg portion and the tiller frame, and further to the dust-proof cylinder portion. A metallic lid for closing the lower end side opening is attached.

[Action]

That is, unlike the conventional case, the dust-proof cylinder portion is not provided for the lock mechanism, but the dust-proof cylinder portion is formed by coupling a part of the tiller frame and a part of the transmission case. As a result, the dustproof cylinder can be placed at the same height level as the cultivating equipment frame part, and the center of gravity can be made lower than that of the cultivating equipment, and the vertical distance from the cultivating equipment is not insufficient, so that the cultivating equipment has the same structure as the cultivating equipment. The transmission structure to the device does not become complicated, and mud is unlikely to be applied.

Further, since the lid body for dustproofing the dustproof cylinder portion from below is made of metal and arranged below the lock mechanism portion, the lid body and the lock mechanism are provided at two locations. It is possible to receive and support the rotary side transmission case, which suppresses shaking and is advantageous in strength.

[Effect of device]

As a result, the integrated structure in which the tiller frame and the transmission case are organically connected to each other allows the structure of the transmission case mounting portion that does not cause a high center of gravity, a complicated transmission structure, and an increase in size to be incorporated into the rotary side transmission case. Was able to be realized while improving the supporting strength of.

〔Example〕

 Next, examples will be shown.

As shown in FIG. 4, the rotary tiller (3), the rotary cover (4) and the tillage depth setting are provided at the rear of the self-propelled vehicle equipped with the wheel (1), the engine (E), the steering handle (2) and the like. Ground Rod (5)
A walking type rotary tiller is configured by connecting the tillers equipped with the above.

The cultivating device is constructed as shown in FIG.

That is, the upper end side of the rotary side transmission case (6) attached to the lower end side so that the cultivating rotary (3) rotates around the horizontal axis (P ₁ ) is attached to the self-propelled vehicle by hitch (7) and Attached to the power transmission case (9) fixed via the tiller frame (8) so as to rotate around the vertical axis (P ₂ ), and at the power take-off shaft (10) of the self-propelled airframe. The drive shaft (12) equipped to rotate around the horizontal axis in the machine-side transmission case (9) in a state of being interlocked via the transmission chain (11) and the rotary side transmission case (6) A vertical axis (P ₂ ) and an input shaft (13) concentrically provided are linked by a bevel gear mechanism (14). Then, as shown in FIG. 2, the body side transmission case
The cylindrical part (9) with the rotary side transmission case (6)
a) to be non-rotatable by spline engagement, and
Attach the tubular lock (15) so that it can slide up and down, and bias the lock (15) downward by the spring (16) to lock the rotary side transmission case (6) at the rotation adjustment position. In addition, the lock mechanism (18) is configured to be locked and unlocked by the operation lever (17) pivotally attached to the body side transmission case (9). That is, when the operating lever (17) is moved to the unlocked position (OFF) by swinging around the shaft center (P ₃ ), the operating lever (17)
The lock member (15) is pulled out from the spline forming portion (6a) of the rotary side transmission case (6) by the engagement of the arm portion (17a) of the lock member (15) with the operating portion (15a) and the lever operating force. The lock is released so that the rotary side transmission case (6) can be rotated by being raised. Then, when the operation lever (17) is rocked to the lock position (ON), the lock (15) is brought into contact with the stopper (19) attached to the spline forming portion (6a) by the urging force of the spring (16). Then, the rotary side transmission case (6) is locked so that the rotary side transmission case (6) cannot be rotated due to the engagement over both the tubular portion (9a) and the spline molding portion (6a).

The tiller frame (8) is attached to the main body of the machine-side transmission case (9).
And a pair of leg portions (9b), (9b) integrally cast to the main body portion so as to form a pair of front and rear connecting portions for connecting the operation lever (17) and a pair of left and right The lock mechanism (1) is provided by each of the tiller frame (8), (8).
A dustproof cylinder (20) is formed to cover 8). Then, the leg portion in a state in which the round pipe case portion of the rotary side transmission case (6) is relatively rotatably externally fitted to a portion located at a lower end side of a portion connected to the body side transmission case (9). The dust-proof cylinder part (2
The lower end side opening of (0) is closed and the rotary side transmission case (6) is configured to be received and supported at the above-mentioned location.

In short, while operating the lock mechanism (18) in the released state, the rotary side transmission case (6) is released to switch the drive rotation direction of the tilling rotary (3) between the forward and reverse directions, or the tilling rotary (3). ) The rotation axis of the rotary shaft core is adjusted to the horizontal or front-back direction, etc., the rotary side transmission case (6) is fixed to the rotation adjustment position by the lock mechanism (18), and the tillage rotary (3) is run. It is fixed in a predetermined mounting state on the machine body.

The dust-proof cylinder portion (20) and the lid body (22) prevent the lock mechanism (18) from adhering dust such as dust on the lock mechanism (18), and the rotary side transmission case (6) is attached to the body side. The work is performed while suppressing the swinging movement around the mounting position for the transmission case (9) by the supporting action of the lid body (22).

As shown in FIG. 3, the lid body (22) is made up of two lid body members (22a) and (22b) that separately form the left half and the right half.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the structure of the transmission case mounting portion of the rotary cultivator according to the present invention, and FIG.
2 is a sectional view of the lock mechanism, FIG. 3 is a perspective view of the lid,
FIG. 4 is a side view of the entire walk-behind cultivator. (3) …… Tillage rotary, (6) …… Rotary side transmission case,
(8) …… Cultivator frame, (9) …… Airframe side transmission case,
(9b) …… Legs, (12) …… Drive shaft, (13) …… Input shaft, (18)
…… Lock mechanism, (20) …… Dustproof cylinder, (22) …… Lid body, (P
₂ ) …… Vertical axis.

Claims (1)

[Scope of utility model registration request] 1. A body side transmission case (9) in which an upper end side of a rotary side transmission case (6) having a tilling rotary (3) rotatably mounted on a lower end side around a horizontal axis is fixed to a traveling body. )
A pivotally mounted in the vertical axis core (P ₂₎ around the machine body side with disposing the input shaft of the rotary-side transmission case (6) (13) to the longitudinal axis (P ₂₎ and coaxially A lock mechanism (18) that can be unlocked to lock the rotary side transmission case (6) at the rotation adjustment position by interlocking the bevel gear with the drive shaft (12) that is rotatable around the horizontal axis of the transmission case (9). Is a transmission case mounting portion structure of a rotary cultivator provided across the rotary side transmission case (6) and the machine body side transmission case (9), and a pair of left and right tilling devices connected to the traveling machine body The frame (8) is connected to the lower part of the machine-side transmission case (9) at both left and right lateral positions of the lock mechanism (18), and the left and right pair of the left-right pair is provided below the machine-side transmission case (9). The legs (9b) located before and after the lock mechanism (18) are extended between the tiller frame (8), and the legs (9b) and the front are extended. The tiller frame (8) and the lock mechanism (18) constitute a dustproof tubular portion (20), and the dustproof tubular portion (20) further includes a metal lid for closing the lower end opening of the dustproof tubular portion (20). The structure of the transmission case attachment part of the rotary cultivator with the body (22) attached.