JP6689181B2 - Tillage machine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a tilling work machine that rotates a tilling claw portion to perform tilling.

  The above-mentioned cultivating work machine is provided with a cultivating claw part that can be rotationally driven, and a cover that covers the upper side and the rear side of the cultivating claw part, and by rotatably driving the cultivating claw part, the cultivating claw part is used. The soil in the field is scraped and cultivated (see, for example, Patent Document 1). Such a tiller is used, for example, mounted on a rear portion of a tractor or the like so as to be able to move up and down.

  The cultivating implement described in Patent Document 1 includes, as a cover, an upper cover that covers the upper part of the cultivating claw portion, and a rear cover that is swingably supported at the rear end of the upper cover. . An elastic body is provided inside the upper cover and the rear cover from the front end of the upper cover to the rear end of the rear cover.

  For example, in a mountainous area or the like, many stones may exist in a field. In such a case, the stones will be scooped together with the soil at the plowing part, and the scraped stones will scatter from the plowing part and collide with the cover, etc., and the cover etc. will be damaged. There is a risk of being lost.

  Therefore, in the tillage implement described in Patent Document 1, at the rear end of the upper cover, between the rotation locus of the tilling claw portion and the elastic body, the stone scraped up by the tilling claw portion is used. A protector member is provided to prevent passage.

Japanese Utility Model Publication No. 5-29302

  In the cultivating machine as described above, the soil cultivated by the cultivating claw portion is pressed by the lower side portion of the rear cover to level the field. At this time, if it is possible to supply a part of the soil raked up by the plowing claws to the front side of the raked position or the plowing claws, re-plowing the soil to improve the crushing performance. Can be improved. Therefore, when pressing the cultivated soil at the lower side portion of the rear cover, it is possible to press the sufficiently cultivated soil, so that the surface of the field can be made to be a smooth and even surface. Therefore, it is desired that a part of the soil scraped by the tilling claw portion can be positively supplied to the scraped position and the front side of the tilling claw portion.

  When supplying the soil scraped up by the tilling claw portion to the front side, the soil is supplied to the front side through a gap formed between the rotation track of the tilling claw portion and the cover. Therefore, in order to meet the above-mentioned demand, in the gap between the rotation locus of the tilling claw portion and the cover, the position where the soil scraped up by the tilling claw portion is positively scraped or the tilling claw portion is used. Also needs to be provided with a structure for supplying to the front side.

  In the tilling work machine described in Patent Document 1, when the soil is supplied to the front side through the gap between the rotation locus of the tilling claw portion and the cover, in the rotating region of the tilling claw portion, the rear side or the diagonally upper rear side. A portion between the rotation locus of the tilling claw portion and the cover on the side corresponds to an entrance portion of soil into the gap portion. However, the gap between the inlets is smaller than that on the downstream side in the rotation direction of the tilling claw, and the soil scraped up by the tilling claw is less likely to enter the gap. .

  Therefore, it is conceivable to increase the distance between the rotation locus of the plowing claw and the cover at a portion corresponding to the entrance to the gap of the scraped soil. However, the larger the distance between the entrances is, the easier the stone enters between the rotation track of the plowing claw and the cover. The problem of damage will increase.

  Further, in the tilling work machine described in Patent Document 1, the gap between the rotation locus of the tilling claw portion and the cover is changed from the entrance of the soil scraped up by the tilling claw portion to the tilling claw portion. It gradually increases in the rotation direction, and the distance between the rotation locus of the tilling claw portion and the cover is maximum at the front end portion of the rear cover (a portion corresponding to the swing fulcrum of the rear cover). Then, in a portion adjacent to the maximum portion on the downstream side in the rotation direction of the tilling claw portion, the interval between the rotation locus of the tilling claw portion and the cover is sharply reduced.

  As described above, in the cultivating implement described in Patent Document 1, since the distance between the rotation locus of the tilling claw portion and the cover changes abruptly, even if soil enters the inlet side of the gap portion. , It is difficult to smoothly guide the soil to the front side. In particular, between the rotation locus of the plowing part and the cover at a part adjacent to the downstream side in the rotation direction of the plowing part with respect to the part where the gap between the rotation locus of the plowing part and the cover is maximum. Since the gap between the two is sharply reduced, the soil may stay in the vicinity, and it may not be possible to move the soil further forward than that. Moreover, since the protector member is arranged at a portion where the gap between the rotation track of the tilling claw portion and the cover is sharply reduced, the protector member greatly hinders the movement of the soil to the front side. There is a possibility.

  In view of this situation, the main problem of the present invention is that the soil scraped by the tilling claw portion can be supplied to the front side of the position or the tilling claw portion that is positively scratched, and foreign matter such as stones. The purpose of the present invention is to provide a tilling implement capable of preventing the cover from colliding and preventing the cover from being damaged.

A first characteristic configuration of the present invention is a cultivating claw part that is freely rotatable, and a cover that covers an upper side and a rear side of the cultivating claw part in a state where a gap is formed between the cultivating claw part and a rotation locus of the cultivating claw part. Is equipped with
In the gap portion, in the rotation region from the rear side to the upper side of the tilling claw portion, the distance between the rotation locus of the tilling claw portion and the cover becomes gradually smaller in the rotation direction of the tilling claw portion. A space changing unit is provided,
The midway portion of the interval changing portion is provided with a protruding portion that projects from the cover side to the rotation locus side of the tilling claw portion in a state of being spaced from the rotation locus of the tilling claw portion ,
Inside the cover, a sheet body is provided in a posture along the inner surface portion of the cover, a support body for fixing the sheet body to the cover is provided, and the protrusion is provided on the support body,
As the sheet body, a front side sheet body arranged on the front side of the cover and a rear side sheet body arranged on the rear side of the cover are provided,
The support is for fixing both the front side sheet body and the rear side sheet body to a cover .

  According to this configuration, when the soil scraped up by the tilling claw portion is supplied to the front side, the soil is fed to the front side through the interval changing portion provided in the rotation region from the rear side to the upper side of the tilling claw portion. Can be supplied to. Then, in the interval changing portion, the interval between the rotation locus of the tilling claw portion and the cover gradually becomes smaller in the rotation direction of the tilling claw portion, so that the interval between the rotation trajectory of the tilling claw portion and the cover sharply increases. The soil scraped up by the tilling claw can be smoothly guided to the front side without changing. Moreover, the gap changing portion can make the gap between the rotation locus of the tilling claw and the cover at the upstream side in the rotating direction of the tilling claw larger than that at the downstream side at the rotating direction of the tilling claw. . As a result, it is possible to increase the distance between the cover and the rotation track of the plowing pawl at the entrance of the gap changing unit, and to positively allow the soil scraped by the plowing pawl to enter the gap. You can As described above, by providing the interval changing portion, the soil scraped up by the tilling claw portion can be positively supplied to the scraped position or the front side of the tilling claw portion.

In addition, by providing a gap change portion for positively supplying the soil scraped up by the tilling claw portion to the front side, a protrusion is provided in the middle of the gap change portion, so that the entrance of the gap change portion can be improved. Even if foreign matter such as stones enters the downstream side in the rotating direction of the tilling claw from the part side, it is possible to properly prevent the foreign matter such as stones from entering the downstream side in the rotating direction of the tilling claw at the protruding portion. it can. Therefore, the soil scraped up by the tilling claw part can be supplied to the position where it is actively scraped up and to the front side of the tilling claw part, while preventing the foreign matter such as stones from colliding with the cover. It is possible to prevent damage.
According to this configuration, since the supporting body for fixing the sheet body to the cover is provided with the projecting portion, the supporting body can also function as the projecting portion, and the simplification of the configuration can be achieved by sharing the configuration. it can.

2nd characteristic structure of this invention is about the space | interval between the rotation locus | trajectory of the said plowing nail part in the said clearance gap part, and the said cover,
The distance between the cover and the rotation track of the plowing claw portion at the front end of the cover is K1,
The interval between the rotation locus of the tilling claw portion and the cover at the top of the cover is K2,
The distance between the rotation locus of the plowing part and the protrusion is K3,
In the case where the distance between the cover and the rotation track of the tilling claw at the rear end of the distance changing portion is K4,
It is configured so as to satisfy the relational expression K4>K1≈K2> K3.

  According to this configuration, by increasing the distance K4 between the cover and the rotation locus of the tilling claw portion at the rear end of the spacing changing portion corresponding to the inlet side of the spacing changing portion, the tilling claw portion is increased. It is possible to positively supply the soil that has been scraped up to the inlet side of the interval changing portion, and to supply a sufficient amount of soil to the front side through the interval changing portion. Moreover, K3, which is the distance between the rotation locus of the tilling claw and the protrusion, is K1 which is the distance between the rotation locus of the tilling claw at the front end of the cover and the cover, and K3 at the top of the cover. By making the distance smaller than K2, which is the distance between the rotation track of the tilling claw and the cover, it is possible to appropriately prevent foreign matter such as stones from entering the front end of the cover and the top of the cover. Therefore, it is possible to appropriately prevent foreign matter such as stones from being caught between the cover and the tilling claw portion at the front end portion of the cover and the uppermost portion of the cover, and to appropriately prevent damage to the cover.

According to a third characteristic configuration of the present invention, an interval between the rotation locus of the plowing claw portion and the cover at the uppermost portion of the cover is K2,
When the distance between the rotation locus of the tilling claw and the protrusion is K3,
It is configured to satisfy the relational expression K2>K3> K2 / 2.

  According to this configuration, the distance K3 between the rotation locus of the tilling claw and the protrusion is smaller than the distance K2 between the rotation locus of the tilling claw at the top of the cover and the cover. However, it is possible to secure a gap larger than K2 / 2. As a result, it is possible to appropriately prevent foreign matter such as stones from entering the top of the cover, while supplying soil to the downstream side of the protruding portion in the rotation direction of the tilling claw, and scraping at the tilling claw. The fried soil can be positively supplied to the front side of the plowing part.

  A fourth characteristic configuration of the present invention is that the protruding portion is provided with an inclined portion that is closer to a rotation locus side of the tilling claw portion toward a downstream side in a rotation direction of the tilling claw portion.

  According to this configuration, when a foreign substance such as a stone enters the gap changing portion, the foreign substance collides with the inclined portion and drops downward. Further, since the inclined portion has an inclined shape that is closer to the rotation locus side of the tilling claw portion on the downstream side in the rotation direction of the tilling claw portion, the foreign matter is not repelled toward the upstream side in the rotating direction of the tilling claw portion. Therefore, the foreign matter can be smoothly dropped to the lower side. As a result, the protrusion prevents the foreign matter from entering the downstream side in the rotating direction of the tilling claw portion from interfering with the movement of the soil to the front side, so that the soil scraped up by the tilling claw portion can be removed. It can be smoothly moved to the downstream side of the protruding portion in the rotation direction of the tilling claw portion.

A fifth characteristic configuration of the present invention is a cultivating claw part that is rotatable and a cover that covers an upper side and a rear side of the cultivating claw part in a state where a gap is formed between the cultivating claw part and a rotation locus of the cultivating claw part. Is equipped with
In the gap portion, in the rotation region from the rear side to the upper side of the tilling claw portion, the interval between the rotation locus of the tilling claw portion and the cover becomes gradually smaller in the rotation direction of the tilling claw portion. A space changing unit is provided,
A midway portion of the interval changing portion is provided with a protruding portion that protrudes from the cover side to the rotation locus side of the tilling claw portion in a state of being spaced from the rotation locus of the tilling claw portion,
Inside the cover, a sheet body is provided in a posture along the inner surface portion of the cover, a support body for fixing the sheet body to the cover is provided, and the protrusion is provided on the support body,
As the sheet body, a front side sheet body arranged on the front side of the cover and a rear side sheet body arranged on the rear side of the cover are provided,
The front side sheet body is sandwiched between the cover and a fastening portion that fixes the rear side sheet body to the cover by being fastened together with the rear side sheet body by a fastening member. And a sandwiching portion for fixing the front side sheet body to the cover,
In the support, the sandwiching portion is provided so as to extend in a state of being folded back from the end portion of the protruding portion on the side closer to the rotation locus of the tilling claw portion to the side closer to the cover.

  According to this configuration, the rear sheet body can be appropriately fixed to the cover by the fastening portion provided on the support body, and the front sheet body can be properly attached to the cover by the sandwiching portion provided on the support body. Can be fixed. Thus, the rear seat body and the front seat body can be appropriately fixed to the cover only by providing the support body, and the configuration can be simplified. Moreover, since the sandwiching portion is extended in a state of being folded back from the end portion of the protruding portion on the side closer to the rotation trajectory of the tilling claw portion to the side closer to the cover, the rigidity of the protruding portion can be increased, The durability of the protrusion can be improved.

Side view with the tiller mounted on the rear of the tractor Perspective view of the tiller Side view of a tiller Side view of the main parts of the tiller Perspective view showing the installation state of the support in the tiller Enlarged cross-sectional view of the portion where the sheet body is fixed to the cover by the support body

An embodiment of a tilling work machine according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, this tillage implement 10 is configured to be attachable to the rear part of the tractor 1. A front portion of the vehicle body portion 2 of the tractor 1 is supported by a pair of left and right front wheels 3, and a rear portion of the vehicle body portion 2 is supported by a pair of left and right rear wheels 4. A three-point link mechanism including a pair of left and right lower links 5 and an upper link 6 is provided at a rear portion of the vehicle body portion 2 of the tractor 1, and the tiller 10 is freely attachable to the three-point link mechanism. . Incidentally, the tiller 10 can be mounted not only directly on the three-point link mechanism, but also on the three-point link mechanism via a hitch member formed in a triangular shape, for example. An elevating device (not shown) having a hydraulic device such as an elevating cylinder is provided at the rear part of the vehicle body portion 2 of the tractor 1, and the elevating device elevates and lowers the three-point link mechanism to move the tiller 10. It is configured to move up and down.

  As shown in FIGS. 2 and 3, the tiller 10 includes a pair of left and right lower side connecting portions 11 for connecting to the lower link 5 and the like, and an upper side connecting portion 12 for connecting to the upper link 6 and the like. And are provided. The lower side connecting portion 11 is formed of a plate-shaped body extending in the front-rear direction, and is configured such that the lower link 5 and the like can be connected to the front end portion thereof. The upper connecting portion 12 is composed of two plate-shaped members that are spaced apart from each other, and is configured such that the upper link 6 and the like can be connected to the front end portion thereof.

  The tiller 10 includes a gear unit 13 that receives an input from a PTO shaft provided at a rear portion of the tractor 1, a rotatably driven tillage claw portion 14, and a cover that covers an upper side and a rear side of the tiller claw portion 14. And 15 are provided.

  The gear unit 13 is arranged at the center of a pipe case 16 extending over the entire length of the tiller 10 in the lateral width direction. The gear unit 13 is configured to rotate the drive shaft housed in the pipe case 16 and transmit the rotational drive force input from the PTO shaft to the transmission case 17. The transmission case 17 is provided at the left end of the pipe case 16. The transmission case 17 is configured to transmit the rotational drive force transmitted by the gear unit 13 to rotationally drive the tiller shaft portion 18.

  The cultivating shaft portion 18 is provided so as to extend over the entire length in the lateral width direction of the cultivating implement 10, and a plurality of cultivating claw portions 14 are provided on the cultivating shaft portion 18 at intervals. As a result, the cultivating shaft portion 18 is rotationally driven, so that the plurality of cultivating claw portions 14 are rotationally driven. Incidentally, the tilling claw portion 14 is configured to perform down-cut tilling which is rotationally driven counterclockwise in FIG.

  As shown in FIGS. 2 to 4, the cover 15 is an upper cover that covers the upper side of the tilling claw portion 14 in a state where a gap 25 is formed between the rotation trajectory R of the tilling claw portion 14 (see FIG. 4). A rear cover 152 that covers the rear side of the tilling claw portion 14 in a state where the gap portion 26 is formed between 151 and the rotation locus R of the tilling claw portion 14 is provided.

  The upper cover 151 is formed in an arc shape from the front end portion to the rear end portion, and the rear cover 152 is also formed in an arc shape from the front end portion to the rear end portion. The front end of the rear cover 152 is rotatably connected to the rear end of the upper cover 151 about an axis G1 (see FIG. 4) along the lateral width direction of the tiller 10, and the rear cover 152 is attached to the upper cover 151. It is supported so that it can swing up and down. A rear end side portion of the rear cover 152 is arranged so as to contact the farm field, and a rear end side portion of the rear cover 152 is configured as a leveling plate 154 for leveling the farm field.

  As shown in FIGS. 2 and 3, the tiller 10 is provided with a side cover 153 that covers a side portion of the tilling claw portion 14 in addition to the upper cover 151 and the rear cover 152. The side cover 153 is formed in a plate shape extending in the up-down direction and the front-rear direction, and is arranged at both ends in the lateral width direction of the tillage implement 10.

  The tiller 10 is provided with a pair of left and right hanger lock mechanisms 24 that can be held while the rear cover 152 is rotated upward. The hanger lock mechanism 24 includes a hanger rod 241 extending in the vertical direction, and a lock support portion 242 capable of holding an upper end side portion of the hanger rod 241 in a state where the hanger rod 241 is prevented from moving. The lower end portion of the hanger rod 241 is rotatably connected to a rear end side portion of the rear cover 152 about an axis along the lateral width direction of the tiller 10. The lock support portion 242 movably supports the hanger rod 241 in a inserted state, and by engaging a pin or the like with the hanger rod 241, the hanger rod 241 is prevented from moving. Configured to hold. Then, by releasing the engagement of the pin or the like with the hanger rod 241, the hanger rod 241 can be moved with respect to the lock support portion 242. As a result, the hanger lock mechanism 24 moves the hanger rod 241 with respect to the lock support part 242 as the rear cover 152 is rotated upward, and the pins or the like are engaged with the hanger rod 241, thereby the rear part It is configured to hold the cover 152 in a state of being rotated upward.

  As described above, the tiller 10 is provided with the pipe case 16 extending over the entire length of the tiller 10 in the widthwise direction, and the pipe case 16 is provided on the rear side of the pipecase 16 in the widthwise direction of the tiller 10. A frame pipe 19 extending over the entire length is provided. As described above, by providing the pipe case 16 and the frame pipe 19, the rigidity of the tiller 10 is improved.

  Further, the tiller 10 is provided with a tail wheel support frame 20 for additionally including a tail wheel. The tail wheel support frame 20 is connected at its front end portion to the rear end portion of the lower side connecting portion 11 so as to be rotatable about an axis along the lateral width direction of the tilling implement 10.

Hereinafter, with reference to FIG. 4, the intervals of the gaps 25 and 26 between the rotation locus R of the tilling claw portion 14 (the outer peripheral portion of the rotation trajectory R of the tilling claw portion 14) and the cover 15 will be described.
As described above, the gap 25 is formed between the rotation locus R of the tilling claw 14 and the upper cover 151, and the gap 26 is formed between the rotation locus R of the tilling claw 14 and the rear cover 152. Has been done. Then, in the gap portions 25 and 26, in the rotation region from the rear side to the upper side of the tilling claw portion 14, the distance between the rotation locus R of the tilling claw portion 14 and the rear cover 152 is the rotation of the tilling claw portion 14. An interval changing section 27 is provided that gradually decreases in the direction A.

  The interval changing portion 27 is provided from a portion corresponding to an entrance portion where the soil scraped up by the tilling claw portion 14 enters the gap portion 26 between the rotation locus R of the tilling claw portion 14 and the rear cover 152. It is provided toward the upper rotation region of the portion 14. That is, the interval changing portion 27 is arranged so that the soil scraped up by the tilling claw portion 14 enters the inlet of the interval changing portion 27. For example, the interval changing portion 27 is located above the rear side of the tilling claw portion 14 by a set amount (for example, the position indicated by K4 in FIG. 4) to the uppermost portion of the upper cover 151 (for example, in FIG. 4, It is provided in the rotation region of the tilling claw portion 14 up to the position indicated by K2).

  The distance between the rotation locus R of the tilling claw portion 14 and the rear cover 152 in the distance changing portion 27 can be configured to be smaller toward the downstream side in the rotation direction A of the tilling claw portion 14, for example. Further, in the rotation direction A of the tilling claw portion 14, the rotation trajectory R of the tilling claw portion 14 has a configuration in which the distance between the rotation trajectory R of the tilling claw portion 14 and the rear cover 152 is the same or substantially the same. The distance between the rear cover 152 and the rear cover 152 may be gradually reduced. As described above, in the interval changing portion 27, the interval between the rotation locus R of the tilling claw portion 14 and the rear cover 152 does not change rapidly in the rotation direction A of the tilling claw portion 14 but becomes gradually smaller. Anything will do.

  A protrusion 211 that protrudes from the cover 15 side to the rotation locus R side of the tilling claw portion 14 is provided in the middle of the interval changing portion 27 in a state of being spaced from the rotation locus R of the tilling claw portion 14. Has been. The projecting portion 211 is arranged on the downstream side in the rotation direction A of the tilling claw portion 14 with respect to the axis G1 that serves as a fulcrum of rotation of the rear cover 152 with respect to the upper cover 151. The projecting portion 211 is arranged, for example, in the rotation region of the tilling claw portion 14 above the intermediate portion between the rear portion and the upper portion of the tilling claw portion 14 above the middle portion.

  The gap between the rotary locus R of the tilling claw portion 14 and the cover 15 in the gap portions 25 and 26 is configured to satisfy the following [relational expression 1] and [relational expression 2]. Here, the interval between the rotation locus R of the tilling claw portion 14 at the front end portion of the upper cover 151 and the upper cover 151 is K1, and the rotation trajectory R of the tilling claw portion 14 at the uppermost portion of the upper cover 151 and the upper cover 151. Let K2 be the interval between and. Further, the interval between the rotation locus R of the tilling claw portion 14 and the projecting portion 211 (the tip portion of the projecting portion 211) is K3, and the rotation trajectory R of the tilling claw portion 14 and the rear portion at the rear end portion of the interval changing portion 27. The distance from the cover 152 is K4.

[Relational expression 1]
K4>K1≈K2> K3

[Relational expression 2]
K2>K3> K2 / 2

  Further, regarding the distance between the rotation locus R of the tilling claw portion 14 and the cover 15 in the gap portions 25 and 26, the rotation locus of the tilling claw portion 14 at the axis G1 that is the swing fulcrum of the rear cover 152 with respect to the upper cover 151. When the distance between R and the cover 15 is K5, the following [Relational Expression 3] and [Relational Expression 4] can be satisfied.

[Relational expression 3]
K4 = K5, K4≈K5, or K4> K5

[Relational expression 4]
K5> K3

  As described above, by providing the interval changing portion 27, when the soil scraped up by the tilling claw portion 14 is supplied to the front side thereof, the soil can be supplied to the front side through the interval changing portion 27. it can. Then, in the interval changing portion 27, the distance between the rotation locus R of the tilling claw portion 14 and the cover 15 becomes gradually smaller in the rotation direction A of the tilling claw portion 14, so that the soil that has entered the gap changing portion 27 is forwarded. You can smoothly guide to the side. Moreover, the interval changing portion 27 increases the interval K4 between the rotation locus R of the tilling claw portion 14 and the cover 15 at the rear end of the interval changing portion 27 corresponding to the inlet side of the interval changing portion 27 to be larger. By doing so, the soil scraped up by the tilling claw portion 14 can be positively supplied to the inlet side of the interval changing portion 27, and a sufficient amount of soil is supplied to the front side through the interval changing portion 27. be able to.

  In this way, the soil scraped by the tilling claw portion 14 can be positively supplied to the scraped position and the front side of the tilling claw portion 14, so that the soil is tilled again. By doing so, crushed soil performance can be improved. Therefore, when the soil cultivated by the leveling plate 154, which is the lower side portion of the rear cover 152, is pressed, the soil cultivated sufficiently can be pressed, so that the surface of the field can be made a smooth and even surface. .

  Then, regarding the distance between the rotation locus R of the tilling claw portion 14 and the cover 15, the distance K3 between the rotation trajectory R of the tilling claw portion 14 and the protruding portion 211 is set at the front end portion of the upper cover 151. The distance K1 between the rotation locus R of the tilling claw 14 and the upper cover 151 and the distance K2 between the rotation locus R of the tilling claw 14 and the upper cover 151 at the uppermost part of the upper cover 151. By making it smaller than this, it is possible to appropriately prevent foreign matter such as stones from entering the front end portion of the upper cover 151 and the uppermost portion of the upper cover 151. Therefore, at the front end of the upper cover 151 and the uppermost portion of the upper cover 151, foreign matter such as stones is appropriately prevented from being caught between the upper cover 151 and the plowing claw portion 14, and damage to the upper cover 151 is prevented. It can be properly prevented.

  Moreover, regarding the distance K3 between the rotation locus R of the tilling claw portion 14 and the projecting portion 211, the distance between the rotation locus R of the tilling claw portion 14 and the upper cover 151 at the uppermost part of the upper cover 151 is determined. Since it is possible to secure a space larger than K2 / 2 while being smaller than a certain K2, it is possible to supply soil to the downstream side of the protruding portion 211 in the rotation direction A of the tilling claw portion 14, and thus to cultivate. The soil scraped up by the claw portion 14 can be positively supplied to the front side of the tilling claw portion 14.

  Inside the cover 15, as shown in FIGS. 4 and 5, a sheet body 22 is provided in a posture along the inner surface of the cover 15. Here, FIG. 5 shows a perspective view of the tiller shaft 10 and the tiller claw portion 14 and the like when omitted from the oblique lower side of the tiller implement 10. The seat body 22 includes a front seat body 221 arranged on the front side of the cover 15 and a rear seat body 222 arranged on the rear side of the cover 15. The front seat body 221 and the rear seat body 222 are provided. And are provided so as to be continuous in the front-rear direction. The front side sheet body 221 is made of, for example, a resin sheet body, and the rear side sheet body 222 is made of, for example, a sheet body having elasticity such as rubber.

  A support 21 for fixing the front sheet body 221 and the rear sheet body 222 to the cover 15 is provided, and the projecting portion 211 is provided on the support 21. Then, as shown in FIG. 5, the support body 21 is provided over the entire length of the cover 15 in the lateral width direction, and the protruding portion 211 is also provided over the entire length of the cover 15 in the lateral width direction. As shown in FIG. 4, the support body 21 is arranged so as to extend to the front side from a position adjacent to the axis G1 that is the swing fulcrum of the rear cover 152 with respect to the upper cover 151. As shown in FIGS. 4 and 6, the support body 21 is formed into an integral plate-shaped body including the fastening portion 212, the inclined portion 213, and the sandwiching portion 214 in this order from the upstream side in the rotation direction A of the tilling claw portion 14. Is configured.

  As shown in FIG. 6, the fastening portion 212 is formed in a plate shape along the inner surface portion of the upper cover 151. The fastening portion 212 is configured to fix the rear seat body 222 to the rear end side portion of the upper cover 151 by being fastened together with the rear seat body 222 by a fastening member 23 such as a bolt and a nut. There is.

  The inclined portion 213 is formed in an inclined shape such that the downstream side in the rotation direction A of the tilling claw portion 14 approaches the rotation locus R side of the tilling claw portion 14. The inclined portion 213 is provided on the support body 21 as the protruding portion 211.

  The sandwiching portion 214 is configured to fix the front sheet body 221 to the upper cover 151 by sandwiching the front sheet body 221 with the upper cover 151. The sandwiching portion 214 extends in the support 21 in a state of being folded back from the end portion of the inclined portion 213 (projection portion 211) on the side closer to the rotation locus R of the tilling claw portion 14 to the side closer to the upper cover 151. Has been done. Thereby, the support body 21 is formed in a V shape in a side view by the inclined portion 213 and the sandwiching portion 214. Incidentally, the front side sheet body 221 is fastened to the front end portion of the upper cover 151 by fastening members 23 (see FIGS. 4 and 5) such as bolts and nuts, in addition to being pinched by the pinching portion 214. Therefore, it is fixed to the upper cover 151.

[Another embodiment]
(1) In the above-described embodiment, the example in which the protruding portion 211 is provided in the support body 21 has been shown, but for example, the protruding portion 211 can be provided separately from the support body 21, and how the protruding portion 211 is provided. This can be changed appropriately.

(2) In the above embodiment, the gap between the rotation locus R of the tilling claw portion 14 and the cover 15 in the gap portions 25 and 26 is configured to satisfy the above [relational expression 1]. The relationship between K1 and K2 may be K1 <K2 or K2 <K1.

(3) In the above embodiment, the gap between the rotation locus R of the tilling claw portion 14 and the cover 15 in the gap portions 25 and 26 is configured to satisfy the above [relational expression 2]. Regarding the relationship with K3, it may be configured to satisfy only K2> K3. That is, as the distance K3 between the rotation locus R of the tilling claw portion 14 and the protruding portion 211 (the tip portion of the protruding portion 211), it is possible to appropriately change how much distance is secured.

  For example, when it is desired to secure a large amount of soil scraped up by the tilling claw portion 14 to the front side, the rotation locus R of the tilling claw portion 14 and the protrusion 211 (the tip of the protrusion 211). It is desirable to make the distance K3 between the above and the above) larger. In addition, in a mountainous area or the like, since many stones are present in the field, the distance K3 between the rotation locus R of the tilling claw portion 14 and the protruding portion 211 (the tip of the protruding portion 211) is set to a smaller distance. By doing so, damage to the cover 15 due to foreign matter such as stones being caught can be appropriately prevented.

  For example, a plurality of types of protrusions 211 having different intervals K3 between the rotation locus R of the tilling claw portion 14 and the protrusions 211 (tips of the protrusions 211) are prepared in advance, and depending on the situation of the field, etc. It is also possible to select which protruding portion 211 is used.

(4) In the above-described embodiment, the support 21 is formed in a V shape in a side view by extending from the protrusion 211 and including the sandwiching portion 214. It is possible to appropriately change whether or not to form.

(5) In the above-described embodiment, an example in which the protruding portion 211 is provided with the inclined portion 213 is shown. However, for example, the protruding portion 211 protrudes as a plate-like member that linearly extends from the cover 15 side to the rotation locus R side of the tilling claw portion 14. The portion 211 can be configured, and the shape of the protruding portion 211 can be appropriately changed.

(6) In the above-described embodiment, the gap changing portion 27 is moved from the rear side of the tilling claw portion 14 by the set amount (for example, the position indicated by K4 in FIG. 4) to the uppermost portion of the upper cover 151 ( For example, it is provided in the rotation region of the tilling claw portion 14 up to the position K2 in FIG. 4), but the gap changing portion 27 may be provided in the rotation region from the rear side to the upper side of the tilling claw portion. It suffices to say that which part of the rotation region from the rear side to the upper side of the tilling claw portion is provided with the space changing portion 27 can be appropriately changed.

  For example, from the position (e.g., the position indicated by K5 in FIG. 4) that is the pivot fulcrum of the rear cover 152 with respect to the upper cover 151 (e.g., the position indicated by K5 in FIG. 4), the uppermost part of the upper cover 151 (e.g., in FIG. 4). The interval changing portion 27 can be provided in the rotation region of the tilling claw portion 14 up to the position K2).

  Further, in the above-described embodiment, the interval changing portion 27 is arranged so that the soil scraped up by the tilling claw portion 14 enters the inlet portion of the interval changing portion 27, but, for example, the tiller nail portion 14 is provided. The soil scraped up by the soil is located on the downstream side in the rotational direction A of the tilling claw portion 14 than the portion corresponding to the entrance portion that enters the gap 26 between the rotation locus R of the tilling claw portion 14 and the rear cover 152. The interval changing section 27 can be arranged so that the inlet of the interval changing section 27 is located.

  In this way, the position of the inlet portion of the interval changing portion 27 can be changed as appropriate, and the position of the end portion of the interval changing portion 27 can also be appropriately changed.

DESCRIPTION OF SYMBOLS 10 Tillage implement 14 Tillage claw 15 Cover 21 Support 22 Sheet body 23 Fastening member 25 Gap 26 Gap 27 Gap changing part 211 Projection 212 Fastening 213 Inclined part 214 Clamping part 221 Front side sheet 222 Rear side Sheet body R Rotation locus of tilling claw

Claims (5)

A freely-rotatable tilling claw portion and a cover that covers the upper side and the rear side of the tilling claw portion in a state of forming a gap between the rotation locus of the tilling claw portion, are provided.
In the gap portion, in the rotation region from the rear side to the upper side of the tilling claw portion, the distance between the rotation locus of the tilling claw portion and the cover becomes gradually smaller in the rotation direction of the tilling claw portion. A space changing unit is provided,
The midway portion of the interval changing portion is provided with a protruding portion that projects from the cover side to the rotation locus side of the tilling claw portion in a state of being spaced from the rotation locus of the tilling claw portion ,
Inside the cover, a sheet body is provided in a posture along the inner surface portion of the cover, a support body for fixing the sheet body to the cover is provided, and the protrusion is provided on the support body,
As the sheet body, a front side sheet body arranged on the front side of the cover and a rear side sheet body arranged on the rear side of the cover are provided,
A tillage implement in which the support body is for fixing both the front side sheet body and the rear side sheet body to a cover . Regarding the distance between the cover and the rotation track of the plowing claw portion in the gap,
The distance between the cover and the rotation track of the plowing claw portion at the front end of the cover is K1,
The interval between the rotation locus of the tilling claw portion and the cover at the top of the cover is K2,
The distance between the rotation locus of the plowing part and the protrusion is K3,
In the case where the distance between the cover and the rotation track of the tilling claw at the rear end of the distance changing portion is K4,
The tillage implement according to claim 1, wherein the tiller is configured to satisfy a relational expression of K4>K1≈K2> K3. The interval between the rotation locus of the tilling claw portion and the cover at the top of the cover is K2,
When the distance between the rotation locus of the tilling claw and the protrusion is K3,
The tillage implement according to claim 1 or 2, which is configured to satisfy a relational expression of K2>K3> K2 / 2.   The plowing work according to any one of claims 1 to 3, wherein the protruding portion is provided with an inclined portion that is closer to a rotation locus side of the tilling claw portion on a downstream side in a rotation direction of the tilling claw portion. Machine. A freely-rotatable tilling claw portion and a cover that covers the upper side and the rear side of the tilling claw portion in a state of forming a gap between the rotation locus of the tilling claw portion, are provided.
In the gap portion, in the rotation region from the rear side to the upper side of the tilling claw portion, the distance between the rotation locus of the tilling claw portion and the cover becomes gradually smaller in the rotation direction of the tilling claw portion. A space changing unit is provided,
The midway portion of the interval changing portion is provided with a protruding portion that projects from the cover side to the rotation locus side of the tilling claw portion in a state of being spaced from the rotation locus of the tilling claw portion,
Inside the cover, a sheet body is provided in a posture along the inner surface portion of the cover, a support body for fixing the sheet body to the cover is provided, and the protrusion is provided on the support body ,
As the sheet body, a front side sheet body arranged on the front side of the cover and a rear side sheet body arranged on the rear side of the cover are provided,
The front side sheet body is sandwiched between the cover and a fastening portion that fixes the rear side sheet body to the cover by being fastened together with the rear side sheet body by a fastening member. And a sandwiching portion for fixing the front side sheet body to the cover,
The plowing work machine , wherein the sandwiching portion is extended in the support in a state of being folded back from an end portion of the protruding portion on a side closer to a rotation trajectory of the tilling claw portion to a side closer to the cover .

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