JPH0723602A - Rotary tiller - Google Patents

Abstract

PURPOSE:To mainly eliminate grass intertwinement in an end of a claw shaft in a rotary tiller. CONSTITUTION:One end of a claw shaft 7 is held freely and rotatably around the shaft center by a bearing unit B fixed on a rotary machine frame, many attaching brackets 19 are fixed on the claw shaft 7 and tilting claws 8 are attached and fixed to each of the attaching brackets 19 to constitute a tilling unit 9. A protecting cover 18 is equipped to cover an outer side in its diameter direction of the claw shaft 7 in a sealed part C which prevents the rotary tilling unit 9 from foreign substances. A grass cutting claw 22, which projects to approach to the outer surface of the protecting cover 18 from the bracket 19, is attached and fixed on a counter side of the bearing unit B of the attaching bracket 19 in the neighborhood of the bearing unit B by an adjustment fixture 20 for attaching the tilting claw 8, and the grass cutting claw 22 is subjected to contact with a front surface of the rotating direction of the claw shaft 7 for attaching bracket 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cultivator mounted on a rear portion of a tractor or the like.

[0002]

2. Description of the Related Art As a rotary cultivator mounted on the rear part of a tractor, for example, support arms are projected from the gear case to the left and right, a transmission case is provided at the outer end of the left support arm, and a side frame is provided at the outer end of the right support arm. There is a side drive type in which the rotary machine frame is fixed in a gate shape.

A pawl shaft is installed between the transmission case and the lower part of the side frame so as to be rotatable around the shaft center, and a large number of mounting brackets are welded on the pawl shaft, and a plowing pawl is mounted and fixed to each mounting bracket. Has been done. Further, a bearing portion is provided below the transmission case and the side frame,
The end portion of the pawl shaft is rotatably supported by this, and the bearing portion is provided with a protective cover for protecting the seal portion thereof.

[0004]

In the above-mentioned conventional one, the grass is entangled between the end portion of the pawl shaft and the protective cover at the time of tilling to reduce the rotational torque of the pawl shaft and to reduce the grass. There is a problem that the sealing material enters the protective cover and deteriorates early. Therefore, it has been considered to provide grass cutting claws in order to eliminate the entanglement of the grass, but providing a mounting portion therefor causes a problem of cost increase.

In view of the above problems, it is an object of the present invention to eliminate grass entanglement at the claw shaft end portion and to consider so as not to increase the cost too much.

[0006]

The technical means taken by the present invention to achieve the above-mentioned object is that the end portion of the pawl shaft 7 is rotatable around the shaft center of the bearing portion B fixed to the rotary machine frame 6. And a plurality of mounting brackets 19 are fixed on the claw shaft 7, and a plowing claw 8 is attached and fixed to each mounting bracket 19 to form a rotary tilling section 9, and the bearing section B is provided on the rotary tilling section 9 side. Claw shaft 7 of seal part C that prevents foreign matter from entering through
In a rotary cultivator having a protective cover 18 covering the radially outer side, a mounting bracket 19 near the bearing B is provided.
A grass cutting claw 22 extending from the bracket 19 so as to be close to the outer peripheral surface of the protective cover 18 is attached and fixed to a side surface of the side opposite to the bearing portion B by a fixing tool 20 for attaching the tilling claw 8. Attach the grass cutting nail 22 to the nail shaft 7 of the mounting bracket 19.
In the direction of rotation A, it is in contact with the front surface.

[0007]

In operation, the grass cutting claw rotates together with the claw shaft around the outer circumference of the protective cover, and removes grass to be caught from the claw shaft to the protective cover. The grass cutting claw is fixedly mounted on the mounting bracket, there is no need to provide a separate mounting portion, and the grass cutting claw is in contact with the front surface of the mounting bracket in the claw shaft rotation direction, so that the claw shaft can be rotated by the grass cutting claw. Even if a stone hits from the front side in the direction, it is not easily deformed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 7 show an embodiment, and in FIGS. 5 and 6, reference numeral 1 denotes a side-drive type rotary cultivator mounted behind a tractor via a three-point link mechanism. The support arm 3 is projectingly provided on the outer side of the left support arm 3 and the transmission case 4
The side frame 5 is fixed to the outer end of the right support arm 3 to form the rotary machine frame 6 in a gate shape.

A pawl shaft 7 is rotatably installed between the lower part of the transmission case 4 and the side frame 5 so as to be rotatable around the left and right axes, and a large number of tilling pawls 8 are mounted on the pawl shaft 7. The rotary tiller 9 is configured by the above. As shown in FIG. 1, on the outer surface of the inner wall 4a of the transmission case 4 on the lower end side, a bearing holder 10 penetrating the inner wall 4a of the case is formed.
Is mounted and fixed, and the bearing 1 is attached to the bearing holder 10.
1, the drive shaft 12 is inserted through and supported by the bearing 11. The flange 1 is provided on the right end side of the drive shaft 12.
3 is integrally formed, and the left end side of the claw shaft 7 is connected to this,
The left end side of the drive shaft 12 is inserted into the transmission case 4, and the sprocket 14 is spline-fitted thereto.
The bearing holder 10 and the bearing 11 constitute a bearing portion B.

The sprocket 14 has a tractor P
The rotary power input from the TO shaft to the PIC shaft of the rotary cultivator 1 is the bevel gear transmission mechanism in the gear case 2, the transmission shaft in the left support arm 3, the sprocket in the upper portion of the transmission case 4, and the chain attached to it. It is transmitted via the claw shaft 7 by the arrow A.
Driven to rotate.

The bearing holder 10 is integrally formed with a ring-shaped mounting wall 15 fixed to the outer surface of the inner wall 4a of the transmission case 4 by a bolt, and the sealing material 16 is provided on the inner peripheral side of the mounting wall 15.
Is provided with a seal holding portion 17, and the seal material C and the seal holding portion 17 constitute a seal portion C. Further, on the outer peripheral side of the mounting wall 15, a cylindrical protective cover 1 which is concentric with the pawl shaft 7 and the drive shaft 12 and is closed by the flange 13 of the drive shaft 12.
8 is integrally formed to protect the seal portion C and the like.

A mounting bracket 19 is welded onto the pawl shaft 7 so as to project in a direction orthogonal to the axial direction, and the mounting bracket 19 connects the front and rear of the left and right side walls 19a in the rotational direction of the pawl shaft 7 to each other. It is formed in a tubular shape. Then, the base of the tiller 8 is inserted into the mounting bracket 19, and the bolts 20 are inserted into the left and right side walls 19a and the through holes formed in the base of the tiller 8.
The plow claw 8 is attached and fixed by inserting the nut 21 and screwing the nut 21 into the nut.

A grass cutting claw 22 is provided on the mounting bracket 19 near the bearing portion of the claw shaft 7. The grass cutting claw 22 is made of a plate material and is provided on the right side wall 1 of the mounting bracket 19.
9a: an attachment wall 23 that is superposed on the outer surface and is also fastened together with a cultivating nail 8 attachment bolt 20;
It is formed in an L-shape from the extension wall 24 extending leftward from the front end in the rotation direction.

As shown also in FIG. 2, the base side of the extending wall 24 is the front surface 1 of the pawl shaft 7 of the mounting bracket 19 in the rotating direction A.
9b is contacted in a face-to-face manner, and the tip end side of the extending wall 24 is close to the outer peripheral surface of the protective cover 18. The bolt insertion hole 25 of the mounting wall 23 is a long hole, and the distance between the tip end side of the extension wall 24 and the outer peripheral surface of the protective cover 18 can be adjusted.

The support structure of the pawl shaft 7 in the lower portion of the side frame 5 is substantially the same as that in the lower portion of the transmission case 4, and the portions having the same functions are designated by the same reference numerals to simplify the description. 3 and 4, the bearing portion B
A support shaft 26 is inserted through and supported by the support shaft 26, and the right end portion of the pawl shaft 7 is connected to the flange 13 fixed to the left end side of the support shaft 26. The front end side of the extension wall 24 of the grass cutting nail 22 and the protective cover 1
The distance between the outer peripheral surface of the protective cover 8 and the outer peripheral surface of the protective cover 18 is slightly larger than that on the transmission case 4 side, and the outer peripheral surface of the protective cover 18 is provided with a protrusion 27 protruding from the outer peripheral surface to the extent that the extended wall 24 is not contacted. It is provided.

In the above construction, when the pawl shaft 7 is driven to rotate at the time of tilling, the grass cutting pawl 2 together with the mounting bracket 19 is driven.
2 rotates, the tip end side of the extension wall 24 of the grass cutting nail 22 rotates the outer periphery of the protective cover 18, whereby the tilling nail 8
The grass to be snare is removed from the end to the protective cover 18. On the left end side of the claw shaft 7, the grass is sheared and reliably removed by the projection 27 and the tip side of the extension wall 24 of the grass cutting claw 22.

As shown in FIG. 1, the rotary tiller 9 is
It is covered with a rotary cover 28 including an upper cover 29 that covers the upper part of the tiller 9, a rear cover 30 that covers the rear of the tiller 9, and other side covers that cover the left and right sides of the tiller 9. The upper cover 29 includes the left and right side plates 29a and the side plate 2
The upper cover 29b between 9a, and the rear cover 30 is
An upper plate 30a pivotally mounted between the side plates 29a at the rear end of the upper cover 29 so as to be rotatable about the left and right axes, and the upper plate 30a.
Lower plate 30b pivotally attached to the lower end so as to be rotatable about the left and right axes
Consists of.

On the upper side of the rotary cover 28, a lowering device 31 which straddles the upper cover 29 and the upper plate 30a of the rear cover 30 is provided, and by this lowering device 31, the rear cover 30 at the time of plowing. The upper plate 30a can be restrained from rotating at an arbitrary position and can be locked and held around the pivot 32 with the upper plate 30a being lifted around the pivot 32. There is.

Further, on the back side of the rear cover 30, there is also provided a lowering device 33 that straddles the upper plate 30a and the lower plate 30b of the rear cover 30, and by this lowering device 33, the lower plate 30b. The rotation of the lower plate 30b can be restricted, and the lower plate 30b can be lowered downward. This lowering device 33
Has a lowering rod 34 whose lower end is pivotally attached to the lower plate 30b, and a lowering coil spring 35 is fitted over the lowering rod 34. The lower end of the coil spring 35 is attached to the lowering rod 34 by a beta pin. It is positioned at any position in the axial direction.

As shown in FIG. 7, the upper part of the lowering rod 34 is inserted into a block-shaped receiving member 36 so as to be slidable in the axial direction, and the receiving member 36 is erected under the lower plate 30b. It is pivotally attached to 37 so as to be rotatable about the left and right axes.
A recess 38 is formed in the receiving member 36 at right angles to the lower rod 34 from the front side, and a lock pin 39 and a spring 40 for biasing the lock pin 39 toward the lower rod 34 are incorporated in the recess 38. At one end of the lock pin 39, there is a cylindrical head 39a that can be inserted into and removed from a number of engaging holes 40a formed in the lower rod 34, and at the other end, an operating lever 41 is provided. It is mounted so that it can be rotated.

At the base of the operating lever 41, the first cam surface 4
2 and the second cam surface 43 are formed, and as shown by the solid line in FIG. 7, the first cam surface 42 is the contact surface 44 of the receiving member 36.
7, the lock pin 39 is pulled up against the urging force of the spring 40 and is held at a position away from the lower rod 34, and the lower plate 30b is allowed to rotate. As shown by the phantom line, when the operation lever 41 is rotated from the above state to bring the second cam surface 43 into contact with the contact surface 44 of the receiving member 36, the head 39a of the lock pin 39 is formed.
The spring 40 is inserted into the engagement hole 40a by the urging force of the spring 40 to restrict the rotation of the lower plate 30b.

FIG. 8 shows another embodiment, in which the axis D of the pawl shaft 7 is set.
On the other hand, the axis E of the protective cover 18 is eccentric. In addition, although the side drive type rotary cultivator was illustrated in the said Example, this invention may be employ | adopted for a center drive type rotary cultivator.

[0023]

According to the present invention, at the time of tilling, the grass cutting claw which rotates with the claw shaft and rotates around the outer periphery of the protective cover can remove grass entangled from the end of the claw shaft to the protective cover. It is possible to prevent a decrease in the rotation torque of the above and to prevent early deterioration of the sealing material due to grass entering the protective cover.

Further, since the grass cutting claw is mounted and fixed to the mounting bracket by the fixing tool for mounting the tilling claw, a separate mounting member is not required, and the cost increase can be prevented.
Also, attach the grass cutting claw to the side surface of the mounting bracket opposite to the bearing section near the bearing section, and extend it from here to come close to the outer peripheral surface of the protective cover. Since it contacts the front surface in the direction, even if a stone or the like hits the grass cutting nail from the front side in the rotation direction of the nail shaft, it is backed up by the mounting bracket and is not easily deformed.

[Brief description of drawings]

FIG. 1 is a rear cross-sectional view of a lower portion of a transmission case according to an embodiment.

FIG. 2 is a left side view of a mounting bracket near a transmission case to which a grass cutting claw is mounted.

FIG. 3 is a rear cross-sectional view of the lower portion of the side frame according to the embodiment.

FIG. 4 is a right side view of the mounting bracket near the side frame to which the grass cutting claw is mounted.

FIG. 5 is a side view of the rotary cultivator.

FIG. 6 is a rear view of a rotary machine frame.

FIG. 7 is a cross-sectional view of the lock structure of the lowering device.

FIG. 8 is a side view showing another embodiment.

[Explanation of symbols]

 6 Rotary Machine Frame 7 Claw Shaft 8 Tilling Claw 9 Rotary Tilling Part 18 Protective Cover 19 Mounting Bracket 20 Bolt 22 Grass Cutting Claw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazumi Umeki, 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. Inside the factory

Claims (1)

[Claims] 1. An end portion of a pawl shaft (7) is supported by a bearing portion (B) fixedly mounted on a rotary machine frame (6) so as to be rotatable around its axis.
A large number of mounting brackets (19) are fixed on the claw shaft (7), and a plowing claw (8) is fixedly mounted on each mounting bracket (19) to form a rotary plowing part (9). ), A rotary cultivator having a protective cover (18) for covering the claw shaft (7) radially outward of the seal portion (C) for preventing foreign matter from entering from the rotary cultivating portion (9) side, wherein the bearing A grass cutting claw extended from the bracket (19) to the side surface of the mounting bracket (19) near the portion (B) opposite to the bearing section (B) so as to be close to the outer peripheral surface of the protective cover (18). The fixing tool (2) for attaching the tiller (8) to the (22)
The rotary tiller is characterized in that it is mounted and fixed by means of 0) and the grass cutting claw (22) is brought into contact with the front surface of the claw shaft (7) of the mounting bracket (19) in the rotation direction (A).