JP5877022B2 - Tillage nail - Google Patents

Description

  The present invention relates to a tilling claw mounted on a tilling claw shaft of a rotary tiller.

  Conventionally, in a rotary cultivator that cultivates soil by the rotation operation of the cultivating claw attached to the cultivating claw shaft, the soil scattered from the cultivating part where the cultivating claw is rotated adheres to the inside of the rotary cultivator. As a preventive measure, there is known a configuration in which an elastic body cover having an effect of suppressing soil adhesion is arranged on an upper cover that covers the top of the tillage part.

  In preparation for the case where soil adheres to the elastic body cover, a notch is provided in advance on the upper cover above the elastic body cover, and the user hits the elastic body cover from the outside through the notch. And the structure which can drop and remove the soil adhering to the inner side (cultivation part side) of an elastic body cover is known (patent document 1).

  In addition, in order to save the user the trouble of soil removal work, the rotation of the tilling claw shaft in the direction opposite to the rotation direction (hereinafter referred to as “forward rotation”) when performing normal tilling work (hereinafter referred to as “forward rotation”). By doing “reverse rotation”, the tip of the tilling nail is intentionally brought into contact with the elastic body cover, and the soil attached to the elastic body cover is dropped by the vibration generated in the elastic body cover due to the contact. A configuration that can be removed has also been proposed (Patent Document 2).

  In this case, the tilling nail is provided with a mounting base attached to the tilling nail shaft, a vertical blade portion and a horizontal blade portion continuously extending from the mounting base in consideration of the plowability as a general tillage performance. It has a shape that is curved in the direction opposite to the rotation direction from the vertical blade part to the horizontal blade part, and the horizontal blade part is curved to one side, and the toe of the horizontal blade part contacts the elastic body cover By doing so, the soil attached to the elastic cover is dropped.

Japanese Utility Model Publication No. 2-12803 Japanese Patent Application No. 2011-52044

  However, the tilling claws attached to the tilling nail shaft are worn by repeated tilling operations, and especially for the edge of the blade that frequently contacts the soil surface as the tilling nail shaft rotates forward. Over time, it causes a sequential decrease.

  As a result, the toe of the tilling nail has a shape in which a curved portion (hereinafter referred to as “head edge”), which extends from the blade edge facing the soil surface to the peak edge not facing the soil surface, is smoothly curved. However, as the wear of the blade edge gradually progresses, the curved portion of the head edge gradually decreases under the influence of the wear, and in addition, the line formed by the wear of the blade edge A corner is formed by the head edge (hereinafter referred to as “wear line”).

  For this reason, in order to remove the soil adhering to the elastic body cover, when the tilling claw shaft is rotated in the reverse direction and the toe of the tilling nail is intentionally brought into contact with the elastic body cover, it is already greatly affected by wear. The tip of the tilling nail that has become sharper causes scratches on the surface of the elastic body cover, causing soil adhesion around the scratched part, and in some cases, causing damage to the elastic body cover There was a problem.

  Therefore, the present invention provides that the shape of the toe does not become sharp even when the wear of the tilling nail attached to the tilling nail shaft has progressed through repeated tilling operations, and as a result, the reverse of the tilling nail shaft. An object of the present invention is to provide a tilling claw capable of performing soil removal work of an elastic body cover by rotation for a long period of time.

  The invention according to claim 1 has a vertical blade portion and a horizontal blade portion that are attached to a tilling claw shaft that performs forward rotation and reverse rotation, and extends continuously from the attachment base portion. In the tilling nail that is curved in the direction opposite to the rotation direction over the horizontal blade portion and the horizontal blade portion is bent to one side, the vertical blade portion and the horizontal blade portion are formed on the blade edge portion and the blade edge portion. And a ridge edge portion on the side of the reverse rotation direction while maintaining a substantially equal interval, and a vertical blade edge tip position, which is a tip of the blade edge portion in the vertical blade portion, is positioned at a maximum. In the side view of the state where the tilling claw is attached to the tilling claw shaft so as to be in the lower position, a tangent at a ridge tip position that is a tip of the ridge edge portion in the horizontal blade portion extends in a substantially vertical direction. It is characterized by.

  Invention of Claim 2 is the tilling nail | claw of Claim 1, Comprising: The said horizontal blade part has the convex top part used as the front-end | tip of the said tilling nail, and the said blade edge part and the said peak edge part It is characterized by having a head edge portion that smoothly connects the two in a curved shape.

  According to the present invention, even when the tilling work is frequently performed and the wear of the tilling nail progresses, the curved shape of the toe can be left (maintained) as much as possible until the tilling nail is bent, and the elasticity is elastic. For the purpose of removing soil adhering to the body cover, it is possible to effectively remove and remove soil without scratching the elastic body cover even when reverse rotation is performed by the tilling claw shaft. .

  For this reason, the user only needs to check the state of wear of the tilling nail assuming normal tilling work, and without having to worry about the shape of the toe, the work associated with the forward and reverse rotation of the tilling nail shaft. Can be done in the long term.

It is a figure which shows the rotary tiller to which the tilling nail | claw which concerns on this invention is applied. It is a figure which shows the rotary tiller to which the tilling nail | claw which concerns on this invention is applied. It is a figure which shows the rotary tiller to which the tilling nail | claw which concerns on this invention is applied. It is a figure which shows the shape of the tilling nail | claw which concerns on this invention. It is a figure which shows the shape of the tilling nail | claw which concerns on this invention. It is a figure which shows the progress state of abrasion of the tilling nail | claw which concerns on this invention. It is a figure shown about the actual shape of the tilling nail | claw which concerns on this invention. It is a figure shown about the actual shape of the conventional tillage nail | claw. It is a figure for comparing the cultivation nail which concerns on this invention, and the conventional cultivation nail.

Hereinafter, an embodiment of a rotary tiller to which a tilling claw according to the present invention is applicable will be described with reference to FIGS. 1 to 3.
FIG. 1: is the external view which looked at the rotary tiller from the diagonally forward direction ahead of the advancing direction of a traveling body about the rotary tiller pulled by a traveling body.
The traveling direction of the traveling machine body that pulls the rotary tiller 10 is defined as “front side”, and the direction opposite to the traveling direction of the traveling machine body is defined as “rear side”, which will be described below.

  As shown in FIG. 1, the rotary tiller 10 includes a top mast 11 and two link connecting portions 12, and a three-point link hitch of a traveling machine body (not shown) with respect to the top mast 11 and the link connecting portion 12. The mechanism (top link and lower link) is connected and pulled by the traveling machine body so as to be able to move up and down.

The top mast 11 is provided with an input shaft 18 through which power is transmitted from a PTO shaft (power transmission shaft) of the traveling machine body via a universal joint or the like (not shown). The gear box 13 is connected.
Further, a transmission frame 14 and a support frame 15 are installed from the gear box 13 in the width direction of the rotary tiller 10.

  For this reason, the power transmitted from the PTO shaft of the traveling machine body is transmitted to the input shaft 18 and the gear box 13 through a universal joint or the like, and the transmission direction and the rotational speed of the power are changed in the gear box 13 so that the transmission frame is changed. 14 is transmitted to a transmission shaft that is inserted through the interior of 14.

  Further, a chain case 16 is fixed to the tip of the transmission frame 14 so as to hang down, and a support arm 17 facing the chain case 16 is fixed to the tip of the support frame 15.

  Further, the tilling claw shaft 6 is installed between the chain case 16 and the support arm 17 so as to be rotatable about the axis, and the transmission shaft inside the transmission frame 14 and the tilling claw shaft 6 are provided inside the chain case 16. Since the chain is stretched between the two, the power of the transmission shaft inside the transmission frame 14 is transmitted to the tilling claw shaft 6 through the chain.

  Here, the shield cover 1 is provided above the cultivating portion 9 that performs tilling by the rotation of the tilling claws 7. In the present embodiment, the shield cover 1 is provided with a cover slit 2.

Next, the embodiment of the rotary tiller 10 will be further described with reference to FIG. 2, which is an external view of the rotary tiller 10 viewed from an oblique rear direction behind the traveling direction of the traveling machine body.
As shown in FIG. 2, the apron 3 is connected to the shield cover 1 in the rearward direction of the shield cover 1 so as to be rotatable up and down, and the apron 3 is provided to cover the rear of the tillage unit 9. In addition, since the rear end of the apron 3 is in contact with the tillage ground, the tillage ground can be leveled.

  And in this embodiment, the leveling member 4 which has the effect of preventing soil adhesion is attached to the rear end part of the apron 3 and in contact with the cultivation ground, and this leveling member 4 is the cultivation ground. By direct contact with the cultivated ground, the cultivated ground can be effectively leveled.

  Further, an apron slit 5 is formed in the apron 3, and the leveling member 4 attached to the lower side of the rear end of the apron 3 can be directly viewed through the apron slit 5, and the leveling member 4 The structure is excellent in appearance due to the exposure.

In the present embodiment, the leveling member 4 is attached to the lower side of the rear end portion of the apron 3, and the rear end portion is attached to the upper end of the rear end portion of the apron 3, Also in this respect, the configuration is excellent in appearance.
And although illustration is abbreviate | omitted about the front end part of the leveling member 4, it becomes a structure joined to the inner surface of the apron 3 with fastening members, such as a volt | bolt.

Next, detailed configurations of the shield cover 1, the apron 3, and the tilling unit 9 in the present embodiment will be described with reference to FIG. 3 which is a side sectional view of the rotary tiller 10.
As shown in FIG. 3, elastic body covers 20 a to 20 c are provided between the shield cover 1 and the tilling part 9, and each elastic body cover has a fastening member (one end on the rear side in the traveling direction of the traveling machine body). In the figure, the fastening member 22a, the fastening member 22b, and the fastening member 22c) are fixed to the inside of the shield cover 1 from the front side, and the other end is freely extended toward the front side in the traveling direction and held. .

  Further, elastic body covers 21a and 21b are provided between the apron 3 and the tilling portion 9, and the elastic body cover 21a has one end on the rear side of the apron 3 by a fastening member (a fastening member 23a in the figure). While being fixed inside, the other end is freely extended toward the front side and held.

  And about the elastic body cover 21b, one end of the front side is fixed by the same fastening member (the fastening member 23a in the figure) that fixes the elastic body cover 21a to the inside of the apron 3, and the other end is different from the other. It is fixed to the inside of the apron 3 by a fastening member (a fastening member 23b in the figure).

Further, in the present embodiment, as shown in FIG. 3, the elastic body cover 20b covers the fastening member 22a, and the elastic body cover 20c covers the fastening member 22b.
The elastic cover 21a covers the fastening member 22c, and the elastic cover 21b covers the inside of the apron 3 from the fastening member 23a to the fastening member 23b.

  For this reason, most of the inner sides of the shield cover 1 and the apron 3 are covered by a plurality of elastic body covers, and the soil scattered from the tillage portion 9 is attached to the shield cover 1 and the apron 3 during the tilling work. It is possible to greatly suppress this.

  In addition, the time of tillage work is a position where the rear end of the apron 3 can come into contact with the soil surface, is in the lowered position D in the figure, and is directed to the direction of the arrow R in the figure. This means that 7 is rotating (forward rotation) and plowing is being performed.

  Here, with respect to the elastic body cover 21a that is most widely opposed to the tilling portion 9, by performing the tilling work, soil adhesion proceeds most quickly compared to other elastic body covers, and in addition, the elastic body As for the fastening member 23a and the fastening member 23b which are not covered by the cover, the soil adhesion proceeds quickly.

  Here, in the present embodiment, the apron 3 is connected to the shield cover 1 so as to be rotatable about the rotation shaft 19 as a center of rotation, and the apron 3 is connected to the shield cover 1 by the lifting mechanism 8. The apron 3 can be lifted in the direction of the arrow S in the figure and the rear end of the apron 3 can be moved to the raised position U in the figure.

In this case, as shown in FIG. 3, one end on the front side of the elastic body cover 21 a enters the inside of the tilling portion 9 and inside the rotation radius Z of the tilling claw 7.
For this reason, the tip of the tilling claw 7 is elastic by rotating (reversely rotating) the tilling claw 7 in the direction of the arrow F in the figure while maintaining the state where the apron 3 is pulled up with respect to the shield cover 1. It is possible to drop and remove the soil adhering to the elastic body cover 21a by the vibration that occurs at the elastic body cover 21a due to contact with one end of the cover 21a.

  Furthermore, when the vibration is generated in the elastic body cover 21a, the vibration is also transmitted to the fastening member 23a and the fastening member 23b, and there is an effect that the soil attached to the fastening member 23a and the fastening member 23b is dropped and removed.

Next, the tilling nail according to the present invention will be described with reference to FIG.
FIG. 4A shows a tilling claw 101 according to the present invention that can be applied as the tilling claw 7 of the rotary tiller 10 described above, and shows a side view of the tilling claw 101.
Moreover, FIG.4 (b) shows the partial bottom view which looked at the tilling nail | claw 101 in Fig.4 (a) from the downward direction.

  As shown in FIG. 4A, the tilling claw 101 according to the present invention has a mounting base 103, a vertical blade part 105, and a horizontal blade part 107 formed in this order in the horizontal direction as viewed in the drawing. It has a shape that is gently curved toward the direction of arrow B in the figure, which is the direction of rotation.

  Further, the vertical blade portion 105 and the horizontal blade portion 107 include a blade edge portion 150 having a curved shape, and a ridge edge portion 170 extending while maintaining a substantially equal interval with respect to the blade edge portion 150. The blade portion 107 has a head edge portion 160 having a convex top portion X that is a tip of the tilling claw 101 while smoothly connecting the blade edge portion 150 and the ridge edge portion 170 in a curved shape.

  The tilling nail according to the present invention has a shape (hereinafter referred to as a “launching shape”) that is gradually raised from the rising line P toward the tip of the tilling nail 101 toward the front of the drawing. Then, as shown in FIG. 4 (b), a rake face 109 is bent to one side with a substantially constant curvature radius r toward the toe, and a rake face 109 is formed on the inner side. It is possible to cultivate as well as plow.

  The attachment base 103 is provided with two attachment holes 104 in the longitudinal direction. A fastening member is inserted into the attachment hole 104, and the attachment base 104 is attached to the tilling claw shaft 6 as shown in FIG. The Rukoto.

  Then, the tilling claw 101 rotates forward about the center position (point O in the figure) of the tilling claw shaft 6 with the maximum rotation radius J as the rotation radius in the direction of the arrow A in the figure. Work will be done.

  Further, in FIG. 4A, the shape of the tilling claw 101 indicated by a two-dot chain line is shown two-dimensionally by developing the tilling claw (three-dimensional object) formed by the rising line P on a plane. It is a shape (hereinafter, this shape is referred to as a “virtual development shape”), and this virtual development shape is the shape of the tilling nail material before the start-up formation process.

  The virtual developed shape is shown for easier understanding of the features of the tilling nail according to the present invention. For convenience of explanation, each edge in the virtual developed shape includes a blade edge 150a, a ridge edge 170a, Shown as a head edge 160a. Here, the blade edge portion 150a in the virtual developed shape approximates a known ideal blade edge curve (envelope curve), as will be described later.

  The blade edge portion 150 is formed to have a substantially constant blade width from the vertical blade portion 105 to the horizontal blade portion 107, and although it is a single blade in this embodiment, it may be a double blade. A configuration in which the angles are different or a configuration in which the angles are equal may be used.

  At the time of tillage work, the tillage claw 101 rotates forward in the direction of the arrow A in the figure, so that the blade edge portion 150 on the vertical blade portion 105 side extends to the blade edge portion 150 on the side blade portion 107 side. Cutting is sequentially performed on the soil surface, and by frequently performing this tillage work, the wear of the tillage claw 101 is increased in the width direction of the tillage claw 101 from the blade edge 150 toward the peak edge 170. Occur.

Next, the shape of the tilling nail according to the present invention will be described in more detail with reference to FIG.
In general, a tilling nail has a tip at the tip of the vertical blade at a position where the unwinding angle α (angle between the rotation radius direction of the tilling nail and the tangent to the unwinding curve) is 57.5 degrees. The ideal curve obtained by polar coordinates so as to be 67.5 degrees at the base portion of the mounting base is designed as an ideal edge curve, and the same applies to the tilling nail according to the present invention. That is, as shown in FIG. 5 (a), the tilling claw 101 of the present invention also has an exhaust angle of 57.5 degrees at the position of the vertical blade edge tip position V of the vertical blade portion 105, and the root portion of the mounting base 103 ( The blade edge 150 has a shape approximating an ideal curve such that the discharge angle (δ in the figure) is about 67.5 degrees at VS in the figure.
FIG. 5A is a side view of the attachment state when the vertical edge edge tip position V is at the lowest position. Hereinafter, the side view in this state is simply referred to as an attachment state side view.

The tilling claw 101 according to the present invention is characterized in that it has a raised shape based on the rising line P, and this structure improves the scavenging action. Here, the rising line P is perpendicular to the tangent line Y of the blade edge 150 at the vertical blade edge tip position V (that is, the lowest position in the attached state side view) (parallel to the vertical line Z passing through the center point O). On the other hand, it is inclined with an angle β.
As shown in FIG. 5B, this rising shape is gradually raised so as to form an arc with a radius r, with the rising line P as the rising start boundary line, and finally, The angle θ and the rising height HL are formed.

  The blade edge position in the tilling claw 101 according to the present invention is set as the blade edge position E at a position where a straight line U inclined by an arbitrary angle γ with respect to the rising line P contacts the blade edge 150.

  A ridge edge 170 is formed on the opposite side of the blade edge 150, and the blade edge 150 and the ridge edge 170 extend while maintaining a substantially constant interval (blade width). This can be more easily understood from the shape relationship between the blade edge portion 150a and the peak edge portion 170a in the virtual development shape indicated by the two-dot chain line. The ridge edge 170 extending while maintaining substantially the same distance from the blade edge 150 is continuous by a smooth curved head edge 160 (160a in the virtual development shape) formed by continuously forming a plurality of arcs. doing. The head edge portion 160 is formed in a convex shape toward the direction of arrow B, which is the direction of reverse rotation of the tilling claw 101. Here, the coupling position between the blade edge portion 150 and the head edge portion 160 is normally set at substantially the same position as the above-mentioned blade edge position E, but at the coupling position between the peak edge portion 170 and the head edge portion 160. A certain peak tip position T is appropriately determined in consideration of various conditions.

  As shown in FIG. 5A, the tilling claw 101 according to the present invention has a tangent line (Q in the figure) of the curved ridge edge 170 at the ridge tip position T extending in a substantially vertical direction in the attached side view. It has a different shape. By comprising in this way, the distance of the top part X which is a toe of the tilling nail 101, and the tilling nail axis | shaft O becomes near, and the influence of the abrasion by the repeated tilling work in a toe is reduced. The relationship between the position of the top X and the influence of wear will be described later.

  Furthermore, the tilling nail according to the present invention has the top X of the curved head edge 160 formed in a convex shape, as shown in FIG. A line segment connecting the center points O (hereinafter, referred to as “horizontal line W”) has a substantially parallel relationship with the tangent line Y at the vertical edge edge tip position V, and the vertical line Z and the horizontal line W are approximately the same. It is preferable to configure to have a vertical relationship.

  Further, in the above description, the discharge angle α (angle formed by the rotational radius direction of the tilling claw and the tangent to the discharge curve) at the vertical blade edge tip position V, which is the tip of the vertical blade portion, is 57. .5 degrees is ideal, but the present invention is not necessarily limited to this angle, and the discharge angle α may be in the range of 55 to 60 degrees. ) Is not limited to 67.5 degrees, and needless to say, it has a slight allowable angle.

  Next, the situation of wear when using the tilling claw 101 according to the present invention will be described with reference to FIG. In addition, FIG. 6 is a figure which showed only the starting shape for convenience of explanation.

  As described above, the wear of the tilling claw 101 causes a sequential decrease in the width direction of the tilling claw 101 from the blade edge 150 toward the peak edge 170, and the wear lines M1, M2, and M3 shown in FIG. It will proceed in order. As the wear progresses, the width of the remaining nail gradually decreases to W1, which is about 3/4 of the original width W0, about W2, about half, and about W3.

  However, in the tilling nail 101 according to the present invention, even when the remaining width is about 1/4, the head edge 160 has an arcuate edge (WL in the figure), and The corner formed at the intersection of the arc-shaped edge of the head edge 160 and the wear line M3 is obtuse and not sharp. For this reason, even if the tilling claw 101 is rotated in the reverse direction and the mud soil attached by smashing the cover with a toe or the like is removed, there is no possibility of damaging the cover.

  In general, if the nail width is worn to about 15 to 20% of the original width, the nail may be broken. Therefore, the nail is replaced before reaching the above level. When used, good mud removal by reverse rotation is continued until the nail is replaced.

  In addition, the wear lines M1 to M3 in the figure are calculated by mathematical formulas or the like as virtual curves, and are similar to the trochoid curves and are generally used as simulations of wear on the tilling nails. is there.

Next, the shape of the tilling nail 101 according to the present invention will be described with reference to FIGS. 7A and 7B with reference to actual dimension values and the like.
Here, the tilling claw 101 shown by a solid line and a two-dot chain line in FIG. 7A is the same as the tilling claw 101 shown in FIGS. 4A and 4B.
Moreover, the dimension value etc. which concern on the tilling nail 101 demonstrated below are examples of an experimental value, and are described as reference information for understanding the shape etc. of the tilling nail 101 according to the present invention.

  First, as shown to Fig.7 (a), the distance of the blade edge part 150 of the tilling nail | claw 101 which concerns on this invention, and the center position (point O in a figure) of the tilling nail axis | shaft 6 is 255 mm. The maximum rotation radius of the nail 101 is 255 mm.

  Further, as shown in FIG. 7 (b), the thickness of the tilling claw 101 is 7 mm, and a position where the rising is started toward the toe is set to a substantially constant radius of curvature (120 mm) with the rising line P as a boundary. The angle (tilt line ZL in the figure) that was finally raised is 60 °, and the height of raising the toe is 115 mm.

  As other dimension values, although not shown in the drawings, the envelope angle α at the vertical blade edge tip position V, which is the tip of the vertical blade portion 105, is 57.5 degrees. The shape is inclined by 19.9 degrees from the direction perpendicular to the tangential direction of the blade edge 150 at the tip edge position V of the vertical blade edge.

  Next, as a comparison target with the tilling claw 101 according to the present invention, the shape of the conventional tilling claw 102 which is an example of the conventional tilling claw 102 is illustrated with reference to actual dimension values and the like in FIGS. ) And will be described.

Here, the conventional tilling claw 102 shown by a solid line and a two-dot chain line in FIGS. 8A and 8B corresponds to the tilling claw 101 according to the present invention shown in FIGS. 7A and 7B. The shape and the like are shown.
Further, the dimensional values and the like related to the conventional tilling claw 102 described below are also examples of experimental values similar to the above-described tilling claw 101, and are described as reference information for understanding the shape and the like of the conventional tilling claw 102. Is.

  First, as shown in FIG. 8 (a), the distance between the edge 150 of the conventional tilling claw 102 and the center position of the tilling claw shaft 6 (point O in the figure) is 255 mm, which is the maximum of the conventional tilling claw 102. The turning radius is 255 mm, which is the same size as the tillage claw 101 according to the present invention.

  Further, as shown in FIG. 8 (b), the thickness of the conventional tilling claw 102 is 7 mm, and a substantially constant radius of curvature (120 mm) with the rising line P as a boundary as a position to start rising toward the toe. The angle at which it was gradually raised (inclined line ZL in the figure) was 60 °, and the height of the toe raised by the rise was 115 mm. Is the same.

  As other dimension values, although not shown in the drawings, the envelope angle α at the vertical blade edge tip position V, which is the tip of the vertical blade portion 105, is 57.5 degrees. Also, this embodiment is the same as the present invention in that it has a shape inclined by 19.9 degrees from the direction perpendicular to the tangential direction of the blade edge portion 150 at the vertical blade edge tip position V.

Next, a situation in which wear has actually progressed using the tilling claws 101 according to the present invention and the conventional tilling claws 102 will be described with reference to dimensional values and the like with reference to FIGS. 9 (a) and 9 (b).
9 (a) and 9 (b), for convenience of explanation of the progress of wear, the rising shapes of the tilling claws 101 and the conventional tilling claws 102 are shown and described respectively.

Further, as for the progress of wear, the tilling work until the general replacement time of the tilling claws 101 and the conventional tilling claws 102 is performed, and the actual dimension values are measured and used as a reference.
About this point, it progresses in order of wear line M1, M2, M3 toward the peak edge part 170 from the position of the original blade edge part 150, and the distance which erosion progressed about the position M3 where wear progressed most. This distance is approximately 30 mm, and the distance of 30 mm for the progress of erosion is used as a standard for determining the general replacement time.

  First, as shown in FIGS. 9A and 9B, the wear of the tilling claws 101 and the conventional tilling claws 102 proceeds in the width direction of the tilling claws 101 from the blade edge 150 toward the peak edge 170. Therefore, in the initial shape shown in FIGS. 7A and 8A, the distance between the blade edge 150 and the ridge edge 170 was 50 mm, but the wear progressed by 30 mm. M3 is where the distance between the edge 150 and the peak edge 170 is 20 mm.

  Here, for the tilling claw 101 according to the present invention of FIG. 9A, the position of the wear line M3 with respect to the head edge portion 160 becomes an erosion point 201 in the figure, and from this erosion point 201 to the ridge tip position T. It can be confirmed that the curve shape (WL in the figure) remains (maintains) more than in the past.

  Here, even if the tilling work is continued without performing the replacement work without noticing the state of wear of the tilling claws 101 according to the present invention, the situation where the tilling claws 101 are about to be bent is also reached. Assuming the temporary wear line KM, the distance between the temporary wear line KM and the ridge edge 170 is assumed to be 5 mm.

  In this case, the position of erosion of the temporary wear line KM with respect to the head edge portion 160 is an erosion point 202 in the figure, and a curved portion from the erosion point 202 to the ridge tip position T remains more than in the past ( Maintained).

  From the above, the tilling claw 101 according to the present invention actually performs the tilling work frequently, and even when the wear progresses until the general tilling nail 101 is replaced, the toe curve shape is reduced. It was confirmed that the curved shape of the toe can be maintained even before the nail breaks and bends even if the replacement time has passed.

  For this reason, even when the tilling work is frequently performed, the reverse rotation of the tillage claw shaft 6 is performed for the purpose of removing the soil adhering to the elastic body cover until the nail is bent and bent. The soil can be dropped and removed effectively without scratching the elastic cover.

  On the other hand, for the conventional tilling claw 102, as shown in FIG. 9B, the erosion position of the wear line M3 with respect to the head edge portion 160 is an erosion point 301 in the figure, and from this erosion point 301 to the peak tip position T. It can be confirmed that the shape of the erosion point 301 becomes sharper in addition to the decrease in the curved portion (WL in the figure).

  In other words, when the tillage claw 101 according to the present invention and the conventional tillage claw 102 are compared by performing tillage work until the general replacement time of the tillage claw (the distance of erosion from the wear blade edge is 30 mm), the conventional tillage is compared. As for the nail 102, although the curved shape at the toe is reduced and a sharp portion is generated, it was confirmed that the tilled nail 101 according to the present invention retains (maintains) the curved shape of the toe as much as possible.

  Further, in the tilling claw 101 according to the present invention, the distance of the progress of wear from the initial position of the blade edge 150 to the peak edge 170, which is eroded by a distance of 30 mm, and then the tilling work is further performed. Even in this case, it was confirmed that the curved shape of the toe can be left (maintained) as much as possible just before the tilling nail 101 is bent.

  From the above, the tilling claw 101 according to the present invention retains the curved shape of the toe as much as possible until the tilling nail 101 is broken even if the tilling work is frequently performed and the wear of the tilling claw 101 progresses ( Therefore, for the purpose of removing soil adhering to the elastic body cover, it is effective without scratching the elastic body cover even when reverse rotation is performed by the tilling claw shaft 6. The soil can be dropped and removed.

  In addition, even in the situation where the replacement time has passed and the tilling work has been continued, the curved shape of the toe can be retained (maintained) as much as possible, so that the nail is about to be bent and broken. Ordinary tillage work and soil removal work accompanying reverse rotation of the tillage claw shaft 6 can be performed.

  That is, the user only needs to confirm the state of wear of the tilling claw 101 assuming normal tilling work, without worrying about the shape of the toe, and accompanying the forward and reverse rotation of the tilling claw shaft 6. Work can be done in the long term.

101 Tilling Claw 103 Mounting Base 105 Vertical Blade 107 Side Blade 150 Blade Edge 160 Head Edge 170 Peak Edge M Wear Line J Maximum Rotating Radius O Center Point

Claims (2)

The mounting base is attached to the tilling claws axis to perform normal rotation and reverse rotation, has a Tateha portion and Yokoha portion extending continuously from the mounting base, the forward rotation direction from said longitudinal edge portion toward the lateral edge portions In the tilling nail that is curved in the opposite direction and the horizontal blade portion is curved on one side,
The vertical blade portion and the horizontal blade portion have a blade edge portion, and a peak edge portion that extends while maintaining a substantially equal interval with respect to the blade edge portion and is on the reverse rotation direction side. ,
The I tip der of the cutting edge in the longitudinal edge portion, the Rutatehaen tip position to position in the intersection between the cutting edge and the rising line to the lowermost position, the tilling claws said A cultivating claw characterized in that a tangent at a ridge tip position that is a tip of the ridge edge portion of the horizontal blade portion extends in a substantially vertical direction in a side view in a state of being attached to a cultivating claw shaft. The said horizontal blade part has the head edge part which has the convex top part used as the front-end | tip of the said tilling nail, and has the head edge part which connects the said blade edge part and the said peak edge part in a curve shape smoothly. The described tillage nail.

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