JP4233951B2 - Front cover mounting structure for rotary tiller - Google Patents

Description

  The present invention relates to a front cover mounting structure in a rotary tiller.

  A main cover is provided above the rotary for conventional tillage so as to be swingable back and forth, a rear cover is provided behind the main cover so as to be rotatable up and down, a front cover is provided in front of the main cover, and a front cover for the main cover is provided. There are known rotary tillers that can adjust the position and state of these (see, for example, Patent Document 1 and Patent Document 2).

As a result, in shallow tillage work where the main cover is swung rearward, the front side of the rotary is covered with the front cover to prevent mud splashing forward, scattering of the carrying soil, etc. In the deep plowing work to be rocked, the front side of the rotary is vacated, the tilling soil is discharged smoothly, and the deep plowing work is performed smoothly.
Japanese Utility Model Publication No. 64-28804 Japanese Utility Model Publication No. 58-152807

  However, the front cover of Patent Document 1 is configured to be swung via a link rod with the same rotary shaft as the swing fulcrum of the main cover as a swing fulcrum, and the distance from the front cover to the swing fulcrum. In addition, a large force is required to swing the front cover, and the swing mechanism is complicated by the link rod. In particular, in the case of Patent Document 1, the link rod on one side causes a left-right twist, etc. There is a drawback that it is difficult to smoothly swing.

  On the other hand, the front cover of Patent Document 2 has a structure in which the front cover is formed of a flexible material and the posture is changed so that the front end side is lifted up. The amount of change in posture is small on the front side of the front cover with respect to the swinging amount, and there was a drawback that it was not easy to achieve both the drainage performance of tilled soil during deep plowing and the cover performance of the rotary front during shallow plowing. .

In order to solve the above problems, the front cover mounting structure in the rotary tiller of the present invention is provided with a main cover 14 that can be swung back and forth above the rotary 4 for tillage, and is rotated up and down behind the main cover 14. moving freely provided the rear cover 16, described above in rotary cultivator provided with a front cover 28 in front of the main cover 14, the front and rear rocking around the nail shaft 12 of the main cover 14 the pawl shaft 12 of the rotary 4 as a swing fulcrum The front cover 28 is slidably supported by a fulcrum provided on the transmission case 8 side that transmits the driving force to the rotary 4 side different from the fulcrum fulcrum of the main cover 14. The front end of the front cover 28 is lowered between the cover 14 and the front cover 28 by swinging the main cover 14 backward. To raise the front end side of the front cover 28 by the swinging of the, the communicating rocking mechanism rocking the front cover 28 is provided, communicating rocking mechanism, a cam surface 34 formed on the main cover 14 side, always rotatably attached to the rear end portion of the front cover 28 consists of roller 33 to be pressed against the said cam surface 34, the front end of the front cover 28 is pivoted vertically by longitudinal rocking of the main cover 14 and Features.

  According to the structure of the present invention configured as described above, the front cover is automatically swung as the main cover swings back and forth, and the front end of the front cover is lowered due to the back swing of the main cover. However, since the front end of the front cover rises due to the swing of the main cover to the front side, the front cover largely covers the front side of the rotary in shallow tillage work where the main cover swings to the rear side. In deep plowing work where the main cover can be swung forward, it is possible to prevent mud splashing and scattering of the carrying soil. There is an effect that the work can be performed smoothly.

  At this time, since the swing fulcrum of the front cover is provided separately from the swing fulcrum of the main cover, the front cover is swung with a relatively small force by arranging the swing fulcrum of the front cover close to the front cover. There is also an advantage that the interlock swing mechanism can be easily configured by a cam or the like. In particular, by providing the swing fulcrum of the front cover on the transmission case side, the swing fulcrum can be provided at a position close to the front cover on the upper side of the main cover, and the swing fulcrum is provided firmly and easily. be able to.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are a partial side sectional view and a plan view of a rotary tiller 1 employing a front cover mounting structure according to the present invention, and it is moved up and down via a three-point link hitch 3 behind a traveling vehicle 2 such as a tractor. It is a well-known one that is freely connected and performs the tilling work of the field by the rotary 4 as the traveling vehicle 2 travels.

  In the rotary tiller 1, a pipe frame 7 projects left and right from a gear case 6 to which PTO power is input from the traveling vehicle 2 side, and a chain case 8 is provided at one outer side (left) of the pipe frame 7. Side frames 9 are integrally provided at the other (right) outer end portion.

  Between the side frame 9 and the lower part of the chain case 8, a claw shaft 12 to which a plurality of tilling claws 11 are attached is rotated by a driving force input from the gear case 6 through the chain case 8. The rotary 4 described above is constituted by the tilling claws 11, the claw shaft 12, and the like. And the rotary 4 (cultivation claw 11) rotates by the rotation drive of the nail | claw axis | shaft 12, and the cultivation work of a farm field is performed.

  At this time, the rotary 4 is attached to the upper side by the main cover 14 having an arc shape along the rotation trajectory of the tip of the tillage claw 11 in a side view and to the rear end side of the main cover 14 so as to be swingable up and down. Each rear side is covered with a rear cover 16, and the main cover 14 carries the cultivated soil by the rotary 4 forward to improve the crushed property at the time of tilling, and the rear cover 16 presses against the cultivated soil to level the tilled surface. Do. The tillage depth is determined by raising and lowering the rotary tiller 1.

  The main cover 14 has an arc-shaped top plate 23 as a base body, and the lower end portions of the side plates 24 provided at the left and right ends of the top plate 23 are the bearing portions of the claw shaft 12 on the chain case 8 or side frame 9 side. It is supported on the side so as to be pivotable back and forth. The main cover 14 is connected via a link arm 30 to a lever 31 that is swingable back and forth on the top mast 17 side attached to the gear case 6 via a bracket 26.

  As a result, the main cover 14 can be rotated back and forth around the claw shaft 12 by swinging the lever 31 back and forth, and the main cover 14 can be adjusted to a position corresponding to the tilling depth. The rear cover 16 is pivotally supported on the main cover 14 via a pressure rod 27 so as to be swingable up and down. When the main cover 14 is rotated (swinged), the rear cover 16 swings back and forth integrally with the main cover 14. Then, the main cover 14 is swung up and down.

  In the case of deep plowing work in which the tilling depth is deep, the main cover 14 is rotated forward in order to smoothly discharge a large amount of tilled soil to the rear, and the space behind the rotary 4 is increased. In the case of shallow plowing work with a large space and a shallow plowing depth such as plowing tillage, the main cover 14 is rotated rearward so that the tilled soil can be smoothly carried around, and the rear of the rotary 4 To reduce the space.

  On the other hand, as shown in FIGS. 1 to 3, a front cover 28 that partially overlaps the main cover 14 (top plate 23) in a plan view and projects forward from the main cover 14 at a position above the main cover 14. Is provided. In the front cover 28, a fulcrum shaft 29 protrudes from the left and right end faces 28a between the front and rear directions, and the fulcrum shaft 29 is provided to protrude forward from the chain case 8 and the side frame 9. Is supported on the rotary tiller 1 side so as to be swingable up and down.

  The front cover 28 is curved in an arc shape in a side view, and the front end protrudes forward from the front end of the main cover 14. A roller 33 is rotatably attached to the rear end portions of the left and right end faces 28a, and the circumferential surface of the roller 33 is in contact with the upper end face of the side plate 24 in the main cover 14 formed as the cam face 34. It is provided so that it can.

  A torsion spring 36 is provided on the left and right end faces 28a of the front cover 28. The front cover 28 is provided with a torsion spring so that the roller 33 is always pressed against the cam surface 34 (the upper end surface of the side plate 24). 36 is energized. As a result, the front cover 28 is vertically swung by the roller 33 being along the cam surface 34 when the main cover 14 is swung back and forth.

  The cam surface 34 is shaped to protrude upward in a mountain shape on the front end side of the main cover 14, and when the main cover 14 is rotated rearward, the front cover 28 is The rear end is lifted by the mountain-shaped protrusion 34a, the front end is swung downward as shown in FIG. 4, and the space b1 between the space a1 and the rotary 4 between the field and the rotary 4 is reduced. The front side of 4 is largely covered while approaching the rotary 4.

  Further, when the main cover 14 is swung forward from the above state where the front end of the front cover 28 is swung downward, the roller 33 descends the protrusion 34a and the rear end of the front cover 28 is swung downward. As shown in FIG. 2, the front end of the front cover 28 is swung upward and lifted to increase the space a <b> 2 between the farm field and the space b <b> 2 with the rotary 4. The front cover 28 is retracted upward so as to be separated from the rotary 4, and a front space of the rotary 4 is made large. At this time, the front cover 28 substantially follows the rotation trajectory of the rotary 4, and the front space of the rotary 4 faces the farm scene side (downward).

  As described above, the front cover 28 swings in conjunction with the back-and-forth swing of the main cover 14, and the cam mechanism including the roller 33 and the cam surface 34 causes the front cover 28 to rotate back and forth with respect to the main cover 14 as described above. An interlocking swing mechanism that swings in conjunction with movement is configured. The swing of the front cover 28 is automatically swinged with the rotation of the main cover 14.

  As a result, in shallow tillage work in which the main cover 14 is rotated rearward, the front side of the rotary 4 is automatically largely covered by the front cover 28, preventing muddy water splashing to the front side, scattering of the carrying soil, and the like. The Further, in the deep plowing operation in which the main cover 14 is swung forward, the front cover 28 is automatically retracted upward, so that the tilled soil is smoothly discharged also on the front side of the rotary 4. Can be performed smoothly.

  At this time, the fulcrum shaft 29 of the front cover 28 is provided at a position near the front end position of the main cover 14 and the front cover 28 on the upper side of the main cover 14, separately from the swing fulcrum (rotary shaft 12) of the main cover 14. And supported by the gear case 8 and the side cover 9 side. Thus, as described above, the fulcrum shaft 29 is positioned at a position close to the interlocking swing mechanism (cam mechanism) that swings the front cover 28 in conjunction with the front-back swing of the main cover. In other words, since the front cover 28 can be swung with a relatively small force, the interlocking swing mechanism can be easily configured by a cam mechanism.

  Therefore, the interlock swing mechanism can be easily configured, the configuration of the front cover 28 can be simplified and downsized, the cost for the front cover 28 can be reduced, and the drive mechanism of the front cover 28 can be reduced. Failure can be reduced. The front cover 28 is supported on the side frame 9 side and the gear case 8 that supports the rotary 4 to which a large torque is applied. Therefore, the support of the fulcrum shaft 29 is stable, and the fulcrum shaft 29 is positioned above the main cover 14. It can be easily provided at a position close to the front cover 28. Since the interlock swing mechanism is a cam mechanism, the support during the swing operation of the front cover 28 is stable, and the automatic swing of the front cover 28 is stably performed.

  Further, the fulcrum shaft 29 is provided near the rear end of the front cover 28 in the front-rear position, and the front end of the front cover 28 is separated from the fulcrum shaft 29 by a relatively long distance. For this reason, the front end of the front cover 28 swings greatly compared to the swing angle (swing amount) on the rear end side (the swing amount can be increased), and approaches and separates from the rotary 4 as described above. Since the rocking is performed, the tilling soil discharging performance during deep plowing and the cover performance in front of the rotary 4 during shallow plowing can be made compatible.

It is a side fragmentary perspective view of the rotary plowing device at the time of deep plowing. It is a top view of a rotary tillage device. It is a top view of the connection part of a front cover. It is a side fragmentary perspective view of the rotary tilling device at the time of shallow plowing.

Explanation of symbols

4 Rotary 8 Chain case (Transmission case)
14 Main cover 16 Rear cover 28 Front cover

Claims (1)

A main cover (14) is provided above the tillage rotary (4) so as to be swingable back and forth, and a rear cover (16) is provided behind the main cover (14) so as to be rotatable up and down. in the rotary cultivator provided with a front cover (28) in front of), front and rear rocking the nail shaft (12) about said main cover (14) as the pawl shaft (12) swing fulcrum of said rotary (4) The front cover (28) is swingably supported by a fulcrum provided on the transmission case (8) side that transmits the driving force to the rotary (4) side different from the swing fulcrum of the main cover (14). Then, the front end side of the front cover (28) is lowered between the front cover (28) and the main cover (14) by swinging the main cover (14) to the rear side, and the front side of the main cover (14). Shaking to the side To raise the front end side of the front cover (28) by a continuous rocking mechanism for rocking the front cover (28) is provided, communicating rocking mechanism, a cam surface formed on the main cover (14) side ( 34) and a roller (33) that is rotatably attached to the rear end portion of the front cover (28) and is always pressed against the cam surface (34). Front cover mounting structure in a rotary tiller in which the front end of the cover (28) is vertically swung .

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