JP5833216B2 - Tillage nail - Google Patents

Description

  The present invention relates to a tilling claw used for tilling work.

  Conventionally, a field cultivation work is performed by a rotary cultivation apparatus in which a cultivation claw is attached to a cultivation axis (claw axis). Since the working efficiency of such a tilling work by the rotary tiller can vary greatly depending on the shape of the tilling nail, various improvements have been made to the shape of the tilling nail.

  For example, the tilling claw described in Patent Document 1 is formed continuously from the mounting base to the vertical blade portion and the horizontal blade portion, and the horizontal blade portion is bent to one side, and this bending start portion Is a half of the total length, and the length in the side view of the blade edge portion in the vertical blade portion is substantially the same as or slightly longer than the length in the side view of the blade edge portion in the horizontal blade portion.

Japanese Patent No. 3098188 (Claim 1, paragraph 0007, FIG. 1)

  According to such a tilling claw, it is possible to hold the soil on the rake face of the horizontal blade portion by reliably supporting the lateral force while ensuring a sufficient vertical cutting depth of the soil by the edge portion of the vertical blade portion. It is thought that it is possible to reduce the vibration of tillage and the horsepower consumption by ensuring the stagnation and release.

  However, the tilling claw gradually deteriorates due to wear due to earth and sand with use. For example, in the above-mentioned tilling claw, the curved portion of the horizontal blade portion is constricted and worn as shown in FIG. End up. This is thought to be because the flow of earth and sand changes in the curved portion of the horizontal blade portion. In this way, if only a part is particularly worn and squeezed (hereinafter referred to as “neck wear”), the ratio of each part will change significantly compared to the original shape, and there is a risk that the tillage performance will be reduced. is there.

  In addition, if it is merely to prevent constriction wear, it is considered that the radius of curvature of the side blade portion should be increased, but in this case, in order to ensure a predetermined cutting width, the vertical blade portion is reduced. Therefore, there is a risk that the tillage performance will be lower than the conventional product.

  The present invention proposes a tilling claw that, as an example, has the above-described problems, such that the tilling performance does not easily deteriorate even when worn due to use.

In order to solve such a problem, the tilling claw according to the present invention has a mounting base attached to the tilling shaft, a vertical blade continuous to the mounting base, and a horizontal blade continuous to the vertical blade. The horizontal blade portion is bent in the direction opposite to the rotation direction from the vertical blade portion to the horizontal blade portion, and the horizontal blade portion is bent to one side from a bending start line that is a boundary with the vertical blade portion. The folding start line has a predetermined cutting width, and the folding start line has an intersection of the bending start line and the edge of the blade with the tilling claw attached to the tilling shaft. In a side view in the direction of the tilling axis when arranged so as to have a predetermined inclination toward the side opposite to the mounting base, the cutting width is the state in which the tilling nail is attached to the tilling shaft. Tillage shaft when it is arranged so that the intersection of the bending start line and the edge of the blade is almost the lowest position Characterized in that at approximately 2 times the relation of the vertical distance between the tip portion and the intersection of the blade edge in the direction of the side view.
Further, the radius of curvature of the bent portion of the horizontal blade portion is arranged so that the intersection of the bending start line and the blade edge portion is substantially at the lowest end position in a state where the tilling claw is attached to the tilling shaft. It is smaller than the horizontal distance between the tilling axis and the intersection in the side view in the tilling axis direction.
Further, in the side view in the direction of the tilling axis when the intersection between the bending start line and the blade edge portion is substantially at the lowermost position in a state where the tilling claw is attached to the tilling shaft, The horizontal distance between the axis and the intersection is greater than half the horizontal distance between the tip of the blade edge and the tilling axis.

  According to the present invention, the cutting angle is reduced by the bending start line being inclined toward the cutting edge side, and in addition, the height of the tip of the blade edge is suppressed to about half of the cutting width. Thus, the earth and sand flows and moves with respect to the entire surface of the horizontal blade portion. Therefore, only a part of the horizontal blade part is not particularly worn as compared with other parts, so that it is difficult to cause constriction wear.

(A) It is a side view which shows the structure of the tilling nail | claw which concerns on one embodiment of this invention. (B) It is a bottom view of (a). (A) It is AA sectional drawing of FIG. (B) It is BB sectional drawing of FIG. (C) It is CC sectional drawing of FIG. (D) It is DD sectional drawing of FIG. (A) It is a schematic diagram which shows the wear-like body of the tilling nail | claw by an Example. (B) It is a schematic diagram which shows the wear-like body of the conventional tilling nail | claw. (A) It is a side view which shows the structure of the tilling nail | claw concerning other embodiment of this invention. (B) It is a bottom view of (a). It is a side view which shows the structure of the tilling nail | claw concerning other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. For the sake of convenience, the same reference numerals are given to the portions having the same operational effects, and the description thereof is omitted. In the present embodiment, a holder type and a flange type will be described as tillage claws.

Embodiment 1 FIG.
FIG. 1 is a side view in the direction of the cultivation axis in a state where a holder type cultivation claw 1 is attached to a rotatable cultivation axis (nail axis) 3 (only the cultivation axis 3a is illustrated for the cultivation axis 3). ). The tilling claw 1 formed in a plate shape is provided continuously with the mounting base 10 attached to the tilling shaft 3, the vertical blade 20 provided continuously to the mounting base 10, and the vertical blade 20. A horizontal blade portion 30, and the vertical blade portion 20 and the horizontal blade portion 30 are formed so as to bend in the direction opposite to the rotation direction (indicated by an arrow Y in FIG. 1) with respect to the mounting base 10. The side blade part 30 is bent and provided on one side (the front side in FIG. 1).

  A blade edge portion 50 having a substantially constant width is continuously provided on the outer peripheral side of the vertical blade portion 20 and the horizontal blade portion 30, and the blade edge portion 50 is a single blade. The blade edge 50 is illustrated by a broken line. The blade edge 50 may be a double-edged blade. In this case, it is preferable that the angles are different, but they may be equiangular. The cutting into the cultivated soil by the rotation of the tillage claw 1 in the direction of the arrow Y is performed from the blade edge 50 of the vertical blade portion 20 to support side force (force in the axial direction) and at the same time prevent entanglement of weeds and the like. Therefore, the blade edge portion 50 is formed to have an appropriate discharge angle.

  Here, FIG. 1A is arranged so that a straight line passing through the tilling axis 3a and the center of the mounting base 10 is vertical, and each part will be described in detail below based on this arrangement. In this case, the intersection point P1 (bending start point at the blade edge portion 50) between the bending start line Ls and the blade edge portion 50, which is a transition from the vertical blade portion 20 to the horizontal blade portion 30, is substantially the lowermost position. It has become.

  The attachment base 10 is provided with an attachment hole 11 for inserting a fastening means such as a bolt. The attachment base 11 is attached to a claw holder (not shown) provided on the tillage shaft 1 by the attachment hole 11. The tilling shaft 3 side (upper side) from the attachment hole 11 is a so-called head 13, and the blade tip 31 side (lower side) which is the tip of the blade edge 50 from the attachment hole 11 is a so-called neck 15. In the illustrated example, the length 13L of the head 13 is about 25 mm, and the length 15L of the neck 15 is about 27 mm. 2A, the mounting base 10 is formed in a rectangular cross section, and the base thickness A1 is about 10 mm and the base width B1 is about 25 mm.

  The vertical blade portion 20 is formed continuously with the neck 15 of the mounting base 10 and is curved in the direction opposite to the rotational direction Y with respect to the mounting base 10. This curvature is such that the radius of curvature increases as the inner peripheral side (the peak 55 side) and the outer peripheral side (the blade edge 50 side) become the tip side. In the illustrated example, the radius of curvature starts from the radius of curvature R1 on the inner peripheral side and switches to the larger radius of curvature R2, and the radius of curvature starts from the radius of curvature R3 and switches to the larger radius of curvature R4. Further, the curvature radius R2 is larger than the curvature radius R3. In this way, the radius of curvature is different between the inner peripheral side and the outer peripheral side, and the radius of curvature increases further toward the tip side. Therefore, as shown in FIGS. The thickness is gradually getting smaller. In the illustrated example, the thickness A2 of the BB cross section close to the mounting base 10 is about 9.5 mm, and the thickness A3 is about 7 mm in the CC cross section near the middle of the vertical blade portion 20. The thickness A4 of the DD cross section near the transition from the portion 20 to the horizontal blade portion 30 is about 5 mm.

  The horizontal blade portion 30 is the entire portion on the blade tip 31 side from the bending start line Ls, and is bent to the front side as a whole. The shape before the bending is shown by a one-dot chain line in FIG. The horizontal blade portion 30 is formed continuously with the vertical blade portion 20, and is curved in the direction opposite to the rotational direction Y with respect to the attachment base portion 10, similarly to the vertical blade portion 20. This curvature is continuous with the curvature of the vertical blade portion 20, and the curvature radius in the illustrated example is the curvature radius R2 on the inner peripheral side and the curvature radius R4 on the outer peripheral side. In addition, the front-end | tip of the horizontal blade part 30 is formed in the unequal side mountain shape which consists of the long side 30a and the short side 30b. As a result, the mass of the horizontal blade portion 30 is reduced, so that the power consumption can be reduced and the dynamic vibration factor is reduced.

  When the center of the mounting hole 11 is used as a reference (origin), the folding is the horizontal distance of the intersection P1 between the bending start line Ls and the blade edge 50, which is the boundary from the vertical blade portion 20 to the horizontal blade portion 30. The bending start distance Lh1 is slightly larger than half of the horizontal distance Lh2 of the full length and the horizontal distance Lh3 to the cutting edge 31 which is the tip of the blade edge 50, and the bending start point (intersection point P1) is It is the blade edge 31 side from the center. The bending of the horizontal blade portion 30 starts from a bending start line Ls and is formed by a substantially constant radius of curvature R5. The curvature radius R5 is formed to be smaller than the bending start distance Lh1.

  The horizontal distance between the intersection point P2 between the bending start line Ls and the peak 55 and the tilling axis 3a is larger than the bending start distance Lh1, so that the bending start line Ls is on the cutting edge 31 side (opposite to the mounting base 10). Side). The folding start angle α, which is the inclination in the illustrated example, is about 8 °, for example. In this way, the bending start line Ls is provided to be inclined toward the cutting edge 31 side, whereby the cutting angle β, which is a guideline for rising of the horizontal blade portion 30, is reduced. The cutting angle β is an angle formed by the line M perpendicular to the line connecting the tip part (blade edge 31) of the blade edge 50 and the tilling axis 3a and the bending start line Ls. A line Ls2 parallel to the curve start line Ls is drawn on the cutting edge 31, and is expressed as an angle between the line Ls2 and the line M.

  Further, the relief height H, which is a vertical distance from the bending start point (intersection point P1) to the cutting edge 31, is a cutting width W that is the width of the horizontal blade portion 30 in the direction of the tilling axis 3a (see FIG. 1B). It is suppressed to about half of. That is, the relationship is H≈W / 2 (or W≈2H), and the allowable range is about ± 5 mm in the size of the illustrated example.

  In the conventional tilling claw that causes neck wear, the flow of earth and sand changes at a predetermined position of the side blade portion, whereas in the above configuration, the bending start line Ls so that the cutting angle β is reduced. Is inclined toward the blade edge 31 side, and in addition, the relief height H is suppressed to about half of the cutting width W, so that the earth and sand slide relative to the entire surface of the horizontal blade portion 30. Move on. Thereby, since only a part of the side blade part 30 is not particularly worn as compared with other parts, it is difficult to cause constriction wear.

  Further, the curvature radius R5 of the horizontal blade portion 30 is smaller than the bending start distance Lh1, and is about 1/2 to 2/3 of the bending start distance Lh1. Thereby, bending angle (gamma) (refer FIG.1 (b)) becomes comparatively large, even if the area of the rake face of the side blade part 30 is small, the embedding of earth and sand is ensured and the release of earth and sand is ensured. . In addition, when the area of the horizontal blade portion 30 is increased, the resistance of the earth and sand may be increased and vibrations may be increased. However, in the tilling claw 1 of the embodiment, the bending start distance Lh1 is half of the horizontal distance Lh3 to the blade edge 31. It is larger by about 2/3 and there is no worry about this. Furthermore, since the vertical blade part 20 can be taken long, the vertical cutting depth of the soil can be ensured.

  Further, by applying a wear-resistant coating to a predetermined portion (the boundary line is indicated by a two-dot chain line in the figure) of the vertical blade portion 20 and the horizontal blade portion 30 on the blade edge portion 50 side, can do.

Specific examples of the dimensions of each part will be shown below. Reference numerals correspond to those in FIG. The length includes an allowable range of about ± 5 mm and an angle of about ± 5 °.
Maximum turning radius Rm: 245mm
Bending start distance Lh1: 110 mm
Full length horizontal distance Lh2: 190mm
Blade edge horizontal distance Lh3: 180 mm
Vertical distance Lv: 193mm
Vertical distance Lv: 128mm
Bending start angle α: 8 °
Cutting angle β: 35 °
Bending angle γ: 60 °
Cutting width W: 55 mm
Escape height H: 27mm
R1: 45mm
R2: 140 mm
R3: 83mm
R4: 162 mm
R5: 65 mm

  The tillage claw 1 having the above dimensions and shape was formed of the material SUP6, the tillage shaft 3 and the conventional tillage claw 90 were mounted on a rotary tiller, and the wear rate of each part was measured. FIG. 3 (a) shows the result of the tilling claw 1 of the embodiment, and FIG. 3 (b) shows the result of the conventional tilling claw 90, respectively. The broken line portion is a worn portion, and it was confirmed that the tilling claw 1 of the example was less constricted and worn than the conventional tilling claw 90. As described above, since the durability is better than that of the conventional product, the life is extended when formed with the same thickness as the conventional product. In addition, when a life equivalent to the conventional one is required, it is possible to reduce the thickness, thereby reducing the weight.

Embodiment 2. FIG.
FIG. 4 shows a flange-type tilling claw 100 according to another embodiment of the present invention. For the parts that are the same as or correspond to those in the first embodiment, the same reference numerals as those in FIG. 1 are used, and only the configuration different from the first embodiment will be mainly described. FIG. 4 is a side view in the direction of the tilling axis 3a in a state where the flange type tilling claw 100 is attached to the rotatable tilling shaft 3. FIG. The tilling claw 100 formed in a plate shape is provided continuously to the mounting base 110 attached to the tilling shaft 3, the vertical blade 120 provided continuously to the mounting base 110, and the vertical blade 120. The horizontal blade portion 130 is formed to be curved in the direction opposite to the rotation direction (indicated by an arrow Y in FIG. 4) from the vertical blade portion 120 to the horizontal blade portion 130. It is bent and provided on the side (front side in FIG. 4).

  Here, the vertical blade portion 20 in the holder type is curved with respect to the mounting base portion 10, whereas the vertical blade portion 120 of the flange type is provided continuously from the mounting base portion 110 without being substantially curved. In the illustrated example, the shape of the tillage claw 100 on the peak 155 side is different from that of the holder type. That is, the holder type is curved with a radius of curvature R1, whereas the flange type is substantially linear.

  In FIG. 4, the intersection P3 (the bending start point at the blade edge 150) between the bending start line Ls3 and the blade edge 150, which is the transition from the vertical blade 120 to the horizontal blade 130, is almost the lowest position. It is arranged so that.

  The mounting base 110 is provided with mounting holes 111 and 112 for inserting fastening means such as bolts. The mounting base (not shown) is provided on the tillage shaft 3 by bolts or the like inserted through the mounting holes 111 and 112. Fastened to the flange. In addition, although the example provided with the attachment hole in two places is shown, it is not limited to this. Also, the arrangement of the mounting holes can be changed as appropriate depending on the type of the rotary tiller.

  The dimensions of each part are in accordance with the first embodiment. For example, the maximum turning radius Rm is 245 mm. What is different from the first embodiment in the dimensions of each part is an initial curvature radius R1 and a bending start distance of the vertical blade part 110. When the cultivation axis 3a is used as a reference, the bending start distance Lh4 is formed to be larger than half of the horizontal distance Lh5 to the cutting edge 131, and the bending starting point P3 is closer to the cutting edge 131 than the center of the tilling claw 100. ing. In the illustrated example, the folding start distance Lh4 is about 120 mm, the horizontal distance Lh5 to the cutting edge is about 180 mm, and the bending starting distance Lh4 is larger than a half of the horizontal distance Lh5 to the cutting edge 131 and is about 2/3. ing. Further, the radius of curvature R6 of the horizontal blade portion 130 is smaller than the bending start distance Lh4 and is about 1/2 to 2/3 of the bending start distance Lh4. In the case of the flange type, since the width corresponding to the base width in the holder type [see FIG. 2 (a)] can be increased, it is suitable as a tilling claw for a tilling work machine that requires higher strength and durability.

  When the tillage claw 100 configured in this way and the conventional tillage nail were mounted on a rotary tillage device and the wear rate of each part was measured, it was confirmed that it was less constricted and worn than the conventional tillage nail. .

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the dimensions, angles, shapes, materials, and the like of each part are appropriately changed. Even if there is a design change or the like without departing from the gist of the present invention, it is included in the present invention. For example, as shown in the embodiment, the present invention can be carried out regardless of whether it is a holder type or a flange type, and various other types of attachment methods are adopted. It is possible.

  In addition, for the holder type and flange type tilling claws, an example in which the tip of the side blade portion is formed in an unequal side mountain shape consisting of a long side and a short side is not limited to this, for example, As shown in FIG. 5, the tip of the horizontal blade portion 230 may be formed in a round shape that is gently curved. The example shown in FIG. 5 is a holder type, and the holder type shown in FIG. 1 is only the shape of the tip of the horizontal blade portion 230 in the tilling claw 200 including the mounting base 210, the vertical blade portion 220, and the horizontal blade portion 230. The bending start line Ls, the cutting width W, the relief height H, the curvature radii R1 to R5, and the like are the same as those of the tilling claw 1.

1 (100) Cultivation Claw 3 Cultivation Shaft 3a Cultivation Shaft Center 10 (110) Mounting Base 20 (120) Vertical Blade 30 (130) Horizontal Blade 50 (150) Blade Edge Ls (Ls3) Bending Start Line P1 Intersection (Folding start point)
H Escape height W Cutting width

Claims (3)

It has a mounting base that is attached to the tilling shaft, a vertical blade that is continuous to the mounting base, and a horizontal blade that is continuous to the vertical blade, and is opposite to the rotational direction from the vertical blade to the horizontal blade. And the horizontal blade portion is a tilling claw bent to one side from a bending start line that is a boundary with the vertical blade portion,
In a side view in the direction of the tilling axis when the intersection between the bending start line and the blade edge is substantially at the lowest end position with the tilling claw attached to the tilling shaft,
Wherein said folding start line, and the mounting base by tilting below 13 ° 3 ° or more toward the opposite side, a line perpendicular to the line connecting the axial center of the tip of the blade edge the tilling shaft The angle between the bend start line and 30 ° or more and 40 ° or less ,
The distance from the other side surface of the attachment base to the tip of the horizontal blade in the tilling axis direction is approximately twice the vertical distance between the tip of the blade edge and the intersection. Tillage claw. 2. The tillage according to claim 1 , wherein a curvature radius of the bent portion of the horizontal blade portion is 60 mm or more and 70 mm or less, and a horizontal distance between the axis of the tillage shaft and the intersection is 105 mm or more and 115 mm or less. claw. The tilling nail according to claim 1 or 2, wherein a horizontal distance between a tip portion of the blade edge portion and the tilling axis is 175 mm or more and 185 mm or less .

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