JP6262033B2 - Rotary tillage device - Google Patents

Description

  The present invention relates to a rotary tiller.

There is a rotary tiller described in Patent Document 1 as a rotary tiller.
This rotary tilling device has a rotary tilling portion that includes a claw shaft that is rotatably provided around a horizontal axis in the lower part of a rotary machine frame, and a plurality of tilling claws attached on the claw shaft. By rotating and driving the nail shaft of the rotary tillage unit, the tilling nail enters the soil to plow the soil, and the plowed soil mass is released backward.

  The rotary tiller includes an upper cover that covers the upper side of the rotary tiller, and a rear cover that covers the rear of the rotary tiller, and the upper end side of the rear cover is pivoted horizontally to the rear end of the upper cover It is pivotally connected via a shaft so as to be swingable up and down.

JP-A-9-65705

In the rotary cultivator, when the soil is cultivated in the rotary cultivator, mud soil cultivated by the cultivating claws is thrown back and crushed by hitting the rear cover, and the mud stuck to the cultivating claws. Scatters outward in the radial direction of the tillage part.
There is a problem that the mud scattered from the tillage portion is likely to adhere to the hinge portion which is the swing center portion of the rear cover.

In addition, there is an elastic cover made of a rubber plate for preventing mud adhesion from the front end of the upper cover (surface on the rotary tiller side), through the hinge portion, to the lower end of the inner surface of the rear cover. However, there is a problem that the weight increases and the cost is high.
Therefore, in view of the above problems, the present invention provides a rotary tiller that can prevent mud from adhering to the hinge portion between the upper cover and the rear cover without significantly increasing the weight and cost. The issue is to provide.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
The rotary tiller includes an upper cover that covers the upper part of the rotary tiller, and a rear cover that covers the rear of the rotary tiller. The upper end of the rear cover is connected to the rear end of the upper cover via a lateral pivot. An elastic cover provided along the inner surface on the rotary tillage portion side of the pivot is disposed between the pivot shaft and the rotary tillage portion, and the elastic cover is disposed behind the upper cover. from the end side provided for the upper end of the rear cover, attached to the inner surface rear is rotary plow side of the upper end of the rear cover with the front is attached to the inner surface is a rotary plow side of the rear end of the upper cover It is and,
A first rib having a front wall extending upward on the inner surface of the rear end side of the upper cover and an upper wall extending from the upper end of the front wall toward the pivot, and recessed in a direction away from the rotary tillage portion. Provided,
On the inner surface of the upper end side of the rear cover, there is an upper wall extending from the pivot toward the lower end side of the rear cover, and a rear wall extending from the lower end of the upper wall toward the rotary tillage portion side, and the rotary Providing a second rib recessed in a direction away from the tillage part,
The elastic cover has a front portion disposed in the first rib and fixed to the upper wall of the first rib, and a rear portion disposed in the second rib and fixed to the upper wall of the second rib. And a midway part extending from the front part to the rear part is bent so as to be separated from the pivot to the rotary tillage part side .

The first rib may be long from one end to the other end in the left-right direction of the upper cover, and the second rib may be long from one end to the other end in the left-right direction of the rear cover. To do.
The front wall of the first rib may be located in front of the front end of the elastic cover, and the rear wall of the second rib may be located behind the rear end of the elastic cover .

The front Symbol shallower than the thickness depth of the elastic cover of the first rib recess, and the depth of the recess of the second rib characterized in that deeper than the thickness of the elastic cover.

The present invention has the following effects.
Between the pivot axis and the rotary tilling portion, it is possible to prevent mud from adhering to the hinge between the top cover and the rear cover by the elastic cover provided along the pivot axis, the elastic cover, It is provided from the rear end side of the upper cover to the upper end side of the rear cover, its front part is attached to the rear end side of the upper cover and the rear part is attached to the upper end side of the rear cover, and only the hinge part and its vicinity are attached. Since it covers, it is possible to protect the hinge portion between the upper cover and the rear cover without increasing the weight and cost.

In addition, by providing a long rib in the left and right direction formed by denting the upper end side inner surface of the rear cover outwardly on the upper end side of the rear cover, the strength of the rear cover can be improved, By disposing the rear portion of the elastic cover in the rib, the unevenness of the arrangement portion of the elastic cover rear portion can be reduced, and mud adhesion on the portion can be reduced.

Moreover, the strength of the upper cover can be improved by providing a long rib in the left-right direction formed by denting the inner surface of the rear end of the upper cover outwardly on the rear end side of the upper cover. At the same time, by arranging the front portion of the elastic cover in the rib, it is possible to reduce the unevenness of the arrangement portion of the front portion of the elastic cover, and it is possible to reduce adhesion of the mud.

Also, reducing the depth of the recess of the first rib of the top cover rear side than the thickness of the elastic cover, by the depth of the recess of the second rib of the rear cover upper side set deeper than the thickness of the elastic cover, It is possible to effectively prevent mud from adhering when soil is cultivated by rotating the rotary cultivating portion of the rotary cultivator down-cut.

It is a side view of a rotary tillage device. It is a back surface partial sectional view of a rotary tillage device. It is an expansion | deployment top view of a rotary cover. It is side surface sectional drawing of the hinge part of a rotary cover. (A) is side sectional drawing of the hinge part of the rotary cover of other embodiment, (b) is an expanded sectional view of the attachment part of the front part of an elastic cover. It is a side view which shows the rotary tillage apparatus of another form. It is a side view of the rear part of the rotary tiller of another form. It is a side view which shows the state which the auto arm removed from the sensor arm. It is a side view which shows the state which the auto arm engaged with the sensor arm.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a rotary tiller 1. This rotary tiller 1 is a side drive type rotary tiller 1 and is mounted via a two-point link 3 behind a tractor 2 that is a traveling vehicle.
The rotary tiller 1 is attached to a gear case 4 located at the center in the left-right direction, support arms 5L, 5R protruding from the gear case 4 to the left and right sides, and the outer end of one (left side) support arm 5L. A rotary machine casing 8 having a transmission case 6 and a side frame 7 attached to the other (right) support arm 5R is provided.

A pair of left and right connecting arms 9 is provided on the upper portion of the rotary machine frame 8 so as to protrude forward, and the front portion of the connecting arm 9 is connected to a connecting bracket 10 provided at the rear lower portion of the tractor 2 around the left and right axes. It is pivotally connected so that it can rotate freely. A midway portion of the connecting arm 9 is interlocked and connected by a lift arm 12 and a lift rod 13 of the hydraulic device 11, and the rotary tiller 1 can be raised and lowered by swinging the lift arm 12 up and down.

A rotary cultivating section 14 for cultivating soil is provided at the lower part of the rotary machine frame 8. The rotary tiller 14 includes a claw shaft 15 that is rotatably supported between the lower part of the transmission case 6 and the side frame 7 and rotates around the axis in the left-right direction, and a plurality of tilling claws 16 attached on the claw shaft 15. It consists of and.
The gear case 4 is provided with a PIC shaft 17, and rotational power is transmitted to the PIC shaft 17 from the PTO shaft of the tractor 2 through a joint. The power transmitted to the PIC shaft 17 is transmitted to the claw shaft 15 via the gear transmission mechanism in the gear case 4, the transmission shaft in the left support arm 5 </ b> L, and the chain transmission means in the transmission case 6. The claw shaft 15 is rotationally driven around the axis by the power transmitted to the claw shaft 15. In the present embodiment, the claw shaft 15 is rotationally driven (down cut rotation) in the direction of arrow A shown in FIG.

When the rotary tiller 14 is rotationally driven in the direction of the arrow A, the tilling claws 16 enter the soil to cultivate the soil, and the cultivated soil mass is released backward.
The rotary machine frame 8 is provided with a rotary cover 18 that covers the rotary tiller 14. In the illustrated example, the rotary cover 18 includes an upper cover 19 that covers the top of the rotary tiller 14, and a rear cover 20 that covers the rear of the rotary tiller 14.

The surface of the upper cover 19 and the rear cover 20 on the rotary tiller 14 side (the surface facing the outer periphery of the rotary tiller 14) is referred to as an inner surface, and the surface opposite to the surface on the rotary tiller 14 side is referred to as an outer surface.
As shown in FIG. 3, the upper cover 19 is formed of a plate material and includes a pair of left and right side plates 21, a main upper cover 22, and a sub plate 23.

The left side plate 21 is disposed on the inner side surface of the transmission case 6 in the left-right direction and fixed to the transmission case 6, and the right side plate 21 is disposed on the inner surface of the side frame 7 in the left-right direction. It is fixed to the frame 7. On the rear end side of each of the left and right side plates 21, a pivot boss 24 made of a cylindrical member having a horizontal axis is provided.
The main upper cover 22 and the sub plate 23 are provided between the left and right side plates 21 and their left and right end portions are fixed to the side plate 21 on the same side in the left and right direction.

  As shown in FIG. 4, the sub plate 23 is a plate material constituting the inner surface of the rear end side of the upper cover 19, and is formed of a plate material thicker than the main upper cover 22. The front portion of the sub plate 23 is overlapped with the upper surface of the main upper cover 22 at the rear end side, and is fixed to the main upper cover 22. The rear portion of the sub plate 23 protrudes rearward from the main upper cover 22, and the rear end thereof is located in the vicinity of the pivot boss 24 in a side view.

  A first rib 26 is formed at the rear portion of the sub-plate 23 by denting a plate material constituting the sub-plate 23 from the inner surface to the outside (the direction from the inner surface of the upper cover 19 to the outer surface). Is formed. The first rib 26 is located in the vicinity of a pivot 29 described later. Further, the first rib 26 is formed long from one end side in the left-right direction to the other end side of the sub-plate 23, and has left and right side walls 26a, a front wall 26b, and an upper wall 26c. It is made into a shape.

Note that the left and right sides of the first rib 26 may be open outward in the left-right direction. Further, the main upper cover 22 may be extended to the vicinity of the pivot boss 24, and the first rib 26 may be formed on the rear end side of the main upper cover 22.
The rear cover 20 is formed of a plate material, and includes a main rear cover 27 and a reinforcing plate 28.

A pivot 29 having a horizontal axis is fixed to the upper end of the main rear cover 27. The upper end portion of the main rear cover 27 is disposed between the left and right side plates 21 of the upper cover 19, and both left and right end sides of the pivot shaft 29 are inserted through pivot support bosses 24 on the same side in the left-right direction so as to be rotatable about the axis. ing. As a result, the rear cover 20 is pivotally connected to the upper cover 19 via the pivot 29 so as to be pivotable about a horizontal axis.

The main rear cover 27 is spring-biased by a lowering device 30 provided between the upper cover 19 and the rear cover 20 in a direction in which the grounding portion on the lower end side contacts the ground.
The reinforcing plate 28 is disposed on the upper inner surface side of the main rear cover 27 and is a plate material constituting the upper inner surface of the rear cover 20. The lower portion of the reinforcing plate 28 is overlapped and fixed to the inner surface of the main rear cover 27. A second rib 31 is formed on the upper portion of the reinforcing plate 28. The second rib 31 is formed by denting a plate material constituting the reinforcing plate 28 from the inner surface to the outside (the direction from the inner surface of the rear cover 20 to the outer surface). Has been. The second rib 31 is located in the vicinity of the pivot 29. The second rib 31 is formed long from one end side to the other end side in the left-right direction of the sub-plate 23. The second rib 31 has left and right side walls 31a, a rear wall 31b, and an upper wall 31c, and the front and lower sides are open. It is said that.

Note that the left and right sides of the second rib 31 may be open outward in the left-right direction. Further, when there is no reinforcing plate 28, the second rib 31 is formed on the main rear cover 27.
As shown in FIG. 1, a hinge portion 32 (of the rear cover 20) between the upper cover 19 and the rear cover 20 is provided between the pivot 29 and the rotary tiller 14 along the pivot 29. An elastic cover 33 is disposed to cover the swing center portion) from the rotary tiller 14 side.

The elastic cover 33 is formed of a rubber plate and is provided from the rear end side of the upper cover 19 to the upper end side of the rear cover 20 as shown in FIG.
A rivet insertion hole 35 through which the rivet 34 is inserted is formed in a penetrating manner on the front and rear end sides of the elastic cover 33 in the left-right direction.
In addition, the front portion 33a of the elastic cover 33 is disposed in the first rib 26, the rear portion 33b of the elastic cover 33 is disposed in the second rib 31, and the front and rear portions 33a and 33b of the elastic cover 33 are rib 26, 31 is immersive.

  A front portion 33a of the elastic cover 33 is superimposed on the inner surface of the upper wall 26c of the first rib 26, and a contact plate 36 is in contact with the rotary tiller 14 side of the front portion of the elastic cover 33. A front portion 33 a of the elastic cover 33 is attached to the rear end side of the upper cover 19 by a rivet 34 that penetrates the contact plate 36, the elastic cover 33, and the upper wall 26 c of the first rib 26.

The corner portion 69 on the upper front end of the front portion 33a of the elastic cover 33 is pressed against the inner surface of the curved corner portion 26d between the front wall 26b and the upper wall 26c of the first rib 26 by the rivet 34 and the contact plate 36. The corner portion 69 is elastically deformed into a curved shape along the inner surface of the curved corner portion 26d.
Further, the rear portion 33b of the elastic cover 33 is superimposed on the inner surface of the upper wall of the second rib 31, and a backing plate 37 is in contact with the rotary tiller portion 14 side of the rear portion of the elastic cover 33. The rear part of the elastic cover 33 is attached to the upper end side of the rear cover 20 by a rivet 34 that penetrates the upper wall of the backing plate 37, the elastic cover 33, and the second rib 31.

Further, the middle portion 33c of the elastic cover 33 is bent so as to be separated from the pivot 29 and to allow vertical swinging around the pivot 29 of the rear cover 20.
In the rotary tiller 1 configured as described above, the elastic cover 33 can prevent mud from adhering to the hinge portion 32 between the upper cover 19 and the rear cover 20. Further, since the elastic cover 33 covers the hinge portion 32 between the upper cover 19 and the rear cover 20 and the vicinity thereof, the hinge between the upper cover 19 and the rear cover 20 is not increased in weight and cost. Portion 32 can be protected.

Further, since the front portion 33 a of the elastic cover 33 is disposed in the first rib 26 and the rear portion 33 b of the elastic cover 33 is disposed in the second rib 31, the front and rear portions 33 a and 33 b of the elastic cover 33 are disposed. Can be reduced, and mud adhesion on the portion can be reduced.
FIG. 5 shows the hinge portion 32 of the rotary cover 18 according to another embodiment.

In this embodiment, the depth D1 of the recess of the first rib 26 is shallower than the thickness T of the elastic cover 33, and the depth D2 of the recess of the second rib 31 is deeper than the thickness T of the elastic cover 33. It has become.
In the rotary tiller 1 of the present embodiment, the rotary tiller 14 is rotated in the direction of the arrow A to rotate it in the down cut direction, but the rear portion 33b of the elastic cover 33 is immersed in the second rib 31 and the elastic cover 33 is inserted. By slightly projecting the front portion 33a from the first rib 26, it is possible to effectively prevent mud from adhering when the rotary tiller 14 is rotated by down-cutting and tilling the soil.

FIG. 6 shows another embodiment of the rotary tiller 1.
The rotary tiller 1 senses the vertical movement of the rear cover 20, operates the hydraulic device 11 of the tractor 2, and maintains the relative height of the rotary tiller 1 with respect to the tractor 2 at a position where the target tillage depth is reached. A plowing depth detection mechanism 38 that detects vertical movement of the rear cover 20 is provided.

The rotary tiller 1 is detachably mounted on a work machine connection frame 41 that is mounted on the tractor 2 so as to be movable up and down by a three-point link mechanism 50 including a top link 39 and a pair of left and right lower links 40. The rotary tiller 1 is lifted and lowered by raising and lowering the lower link 40 by the hydraulic device 11 of the second type.
The tilling depth detection mechanism 38 includes a rotation member 42, a restriction link 43, a transmission cable 44, an interlocking arm 45, and a sensor arm 46.

As shown in FIG. 7, the rotation member 42 is made of a plate material, and a lower end side thereof is freely rotatable about a left and right axis via a support shaft 48 to a support boss 47 fixed to the upper and lower middle part of the rear surface of the rear cover 20. It is supported.
One end side (rear end side) of the restriction link 43 is connected to the upper front side of the rotation member 42 so as to be rotatable about the left and right axis, and the other end side (front end side) of the restriction link 43 is the rear of the upper cover 19. It is connected to a bracket 49 fixed to the end side outer surface (upper surface) so as to be rotatable about a left-right axis. Due to the restriction link 43, when the rear cover 20 moves up and down around the pivot 29, the rotating member 42 swings around the support shaft 48 in conjunction with the up and down movement.

  The transmission cable 44 is configured by a push-pull cable composed of an outer cable 44a and an inner cable 44b. One end side of the outer cable 44a of the transmission cable 44 is fixed to an outer receiver 51 provided in front of the support boss 47 on the rear surface side of the rear cover 20, as shown in FIG. The other end side of the outer cable 44a of the transmission cable 44 is fixed to an outer receiver 53 fixed to a support stay 52 provided on the rotary machine frame 8, as shown in FIG.

One end side of the inner cable 44b of the transmission cable 44 is pivotally connected to the upper rear side of the rotating member 42 as shown in FIG. The other end side of the inner cable 44b of the transmission cable 44 is pivotally connected to the upper portion of the interlocking arm 45 as shown in FIGS.
As shown in FIG. 8, a rotating boss 54 is fixed to the lower end of the interlocking arm 45, and this rotating boss 54 is supported by a support shaft 55 provided on the rotary machine frame 8 so as to be rotatable about the left and right axes. ing.

The upper end of the sensor arm 46 is fixed to the rotating boss 54. The sensor arm 46 is provided with a hook-shaped engaging portion 56.
As shown in FIGS. 8 and 9, an auto arm 57 that engages with the engaging portion 56 of the sensor arm 46 is provided in the work implement connection frame 41 in a state where the rotary tiller 1 is connected to the work implement connection frame 41. It has been. The upper end of the auto arm 57 is fixed to an attachment boss 60 that is supported by an auto bracket 58 provided on the work machine connection frame 41 via a support shaft 59 so as to be rotatable about a left and right axis. The lower end of the auto link 61 is fixed to the mounting boss 60.

In a state where the rotary tiller 1 is connected to the work machine connection frame 41, the support shaft 55 and the support shaft 59 are arranged concentrically.
One end side of the inner cable 62a of the relay cable 62 composed of the inner cable 62a and the outer cable 62b is pivotally connected to the upper portion of the auto link 61. One end side of the outer cable 62 b of the relay cable 62 is fixed to an outer receiver 63 provided on the auto bracket 58.

  As shown in FIG. 6, the other end side of the outer cable 62 b of the relay cable 62 is fixed to an outer receiver 65 fixed to a top link bracket 64 provided on the tractor 2. The other end side of the inner cable 62a of the relay cable 62 is connected to a relay arm 67 pivotally supported on the top link bracket 64 by a support shaft 66 so as to be rotatable around the left and right axes. The relay arm 67 is provided with a relay lever 68, and this relay lever 68 is linked to a control device that controls the hydraulic device 11 via a linkage member such as a link.

  In the rotary tiller 1, as shown in FIG. 7, when the rear cover 20 swings upward, the rotating member 42 rotates rearward about the support shaft 48, and the inner cable 44 b of the transmission cable 44. Is moved. When the inner cable 44b of the transmission cable 44 is pulled, as shown in FIG. 9, the interlocking arm 45 swings backward from the position indicated by the phantom line to the position indicated by the solid line, and the sensor arm 46 is indicated by the phantom line. Swing forward from the position to the position indicated by the solid line.

Accordingly, the auto arm 57 swings backward from the position indicated by the phantom line to the position indicated by the solid line, and the inner cable 62a of the relay cable 62 is pulled. The relay arm 67 and the relay lever 68 are swung by the inner cable 62 a of the relay cable 62, and this swing is transmitted to the control device that controls the hydraulic device 11.
As a result, the change in the tilling depth is transmitted to the control device of the hydraulic device 11, and the rotary tiller 1 is lifted and lowered by the hydraulic device 11 so as to keep the tilling depth constant.

In the conventional plowing depth detection mechanism, in order to transmit the movement of the rear cover 20 from the rear cover 20 to the sensor arm 46, the vertical movement of the rear cover 20 is converted into a left and right movement and then to the sensor arm 46. Since the transmission is performed, there is a problem that the number of parts is large and hysteresis is large when the vertical movement of the rear cover 20 is converted into the horizontal movement.
In the plowing depth detection mechanism 38 of the present embodiment, the number of links is reduced by directly transmitting the vertical movement of the rear cover 20 to the sensor arm 46, and the hysteresis is reduced by the amount of links, and the rotating member 42. Since the movement around the left and right axis is directly transmitted to the sensor arm 46 that moves around the left and right axis, the responsiveness is improved.

14 Rotary tilling part 19 Upper cover 20 Rear cover 29 Axis 26 First rib (rib)
31 Second rib (rib)
33 Elastic cover 33a Elastic cover front part 33b Elastic cover rear part D1 Depth depth of the first rib D2 Depth depth of the second rib T Elastic cover thickness

Claims (4)

An upper cover that covers the upper part of the rotary tiller and a rear cover that covers the rear of the rotary tiller, and the upper end of the rear cover pivots to the rear end of the upper cover via a left and right pivot. An elastic cover provided along the inner surface of the pivot shaft on the side of the rotary tillage portion is disposed between the pivot shaft and the rotary tillage portion, and the elastic cover is arranged from the rear end side of the upper cover to the rear cover. be provided over the upper side and the rear is attached to the inner surface is a rotary plow side of the upper end of the rear cover with the front is attached to the inner surface is a rotary plow side of the rear end of the upper cover,
A first rib having a front wall extending upward on the inner surface of the rear end side of the upper cover and an upper wall extending from the upper end of the front wall toward the pivot, and recessed in a direction away from the rotary tillage portion. Provided,
On the inner surface of the upper end side of the rear cover, there is an upper wall extending from the pivot toward the lower end side of the rear cover, and a rear wall extending from the lower end of the upper wall toward the rotary tillage portion side, and the rotary Providing a second rib recessed in a direction away from the tillage part,
The elastic cover has a front portion disposed in the first rib and fixed to the upper wall of the first rib, and a rear portion disposed in the second rib and fixed to the upper wall of the second rib. And a midway portion extending from the front portion to the rear portion is bent so as to be separated from the pivot toward the rotary tillage portion . The first rib is formed long from one end to the other end in the left-right direction of the upper cover, and the second rib is formed long from one end to the other end in the left-right direction of the rear cover. Item 2. The rotary tiller according to Item 1. The rotary tillage according to claim 1 or 2 , wherein a front wall of the first rib is located in front of a front end of the elastic cover, and a rear wall of the second rib is located behind a rear end of the elastic cover. apparatus. Previous Symbol shallower than the thickness depth of the elastic cover of the first rib indentations, and any of claims 1-3 in which the depth of the recess of the second rib characterized in that deeper than the thickness of the elastic cover The rotary tiller of Claim 1 .

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