JP2548535B2 - Tillage claw - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a tilling claw used by being mounted on, for example, a rotary tilling device, and more particularly to a tilling claw capable of performing a soil digging work or a soil gathering work.

[Prior art]

As a tilling claw for performing soil digging work and earth gathering work, for example, as disclosed in Japanese Utility Model Laid-Open No. 58-55402 and Japanese Utility Model Laid-Open No. 58-113301, a vertical blade is continuously attached to the mounting base to the plowing shaft. Part and a horizontal blade part, and the part from the starting end of the vertical blade part that is continuous to the mounting base to the tip of the horizontal blade part is gradually separated from the end toward the plane one side orthogonal to the axis of the tillage pawl shaft. It is known that it is curved with a gentle curvature.

[Problems to be Solved by the Invention]

By the way, in the above-mentioned cultivating nail of the prior art, in the former (Japanese Utility Model Laid-Open No. 58-55402), a curved curved surface is formed in the direction opposite to the curved direction at the tip back part of the horizontal blade, and In the latter case (Japanese Utility Model Laid-Open No. 58-113301), since it is gradually twisted in the curved direction as it approaches the tip of the horizontal blade part, when the plowing nail is driven into the soil, the curved surface is curved. Or, the twisted curved surface strongly hits the soil to increase the tilling resistance, which increases not only the required power but also the vibration of the rotary tiller easily, resulting in the adverse effect on the rotary tiller and the tractor. There was the above problem.

[Means for Solving the Problems]

In order to solve the above problems, the present invention forms a vertical blade portion 5 and a horizontal blade portion 6 in succession to the attachment base portion 4 to the tillage claw shaft 1, and the horizontal blade portion 6 is formed from the vertical blade portion 5 to the horizontal blade portion 6. In the tiller claw 3 in which the portion reaching the tip is gradually curved away from the plane orthogonal to the axis of the tiller claw shaft 1 toward one side with a gentle curvature, the starting end portion of the lateral blade portion 6 is The cross-sectional shape of the bending line A that runs obliquely from the blade edge 7 side to the ridge edge 8 side is concave on the ventral surface 9 side and gradually convex on the back surface 10 on the opposite side. The cross-sectional shapes of bending lines B and C that are substantially parallel to the line A and obliquely pass through the central portion and the terminal end portion of the horizontal blade portion 6 are the same as those of the blade edge 7 as they extend from the bending line A toward the tip side of the horizontal blade portion 6. The intersections B1 and C1 of the are concave on the ventral surface 9 and convex on the back surface 10, and the intersections B2 and C2 of the ridge 8 are convex on the abdominal surface 9. Shape, gradually curved like a concave shape on the back surface 10,
It is characterized in that it is formed by curving so as to form a gentle S shape as a whole.

[Action]

With the above structure, the plowing claw 3 of the present invention is smoothly cut from the vertical blade 5 portion to the cross-sectional portion where the abdominal surface 9 of the horizontal blade portion 6 is concave when driven into the soil, and further, of the horizontal blade portion 6. At the tip, the soil is struck on the abdominal surface 9 side without hitting strongly, the whole nail passes through the soil with little resistance, the plowing resistance is reduced, and the required power is reduced. As a result, the rotary tiller is vibrated. You can comfortably cultivate soil and soil.

【Example】

An embodiment of the present invention will be specifically described below with reference to the drawings. In FIGS. 1 to 3, reference numeral 1 denotes a tilling claw shaft horizontally mounted on a rotary tilling device (not shown), and the tilling claw 3 is attached to the tilling claw shaft 1 via a claw attachment box 2. The tilling claw 3 is composed of a mounting base 4, a vertical blade 5, and a horizontal blade 6, and is continuous from a mounting base 4 parallel to a plane orthogonal to an axis passing through the axis O of the tilling shaft 1. The vertical blade portion 5 and the horizontal blade portion 6 that are formed gradually move away to one side with almost no folding curve until reaching the tip of the horizontal blade portion 6 with the attachment base portion 4 as the bending start line. Is gently curved. A single-edged blade edge 7 is formed on the side of the plowing claw 3 into the soil, on the curved direction side of the vertical blade portion 5 and the horizontal blade portion 6. The vertical blade portion 5 is substantially linear from the blade edge 7 side to the ridge edge 8 side, and the ventral surface 9 and the back surface 10 are substantially linear, but the horizontal blade portion 6 has bending lines A, B and C shown in FIG. Corresponding first
It changes as shown by the cross-sectional shape of each (b) in FIGS. That is, as shown in FIG. 1, the cross-sectional shape of the bending line A passing obliquely from the blade edge 7 side to the ridge edge 8 side from the starting end portion of the horizontal blade portion 6 has a concave shape on the ventral surface 9 side and on the opposite side. Back 10
It gradually bends gradually in a convex shape. Further, as shown in FIGS. 2 and 3, the cross-sectional shapes of bending lines B and C which are substantially parallel to the bending line A and which obliquely pass through the central portion and the terminal end portion of the horizontal blade portion 6 are the bending line A. From the side to the tip side of the horizontal blade portion 6, the intersections B1 and C1 with the blade edge 7
The side has a concave shape on the ventral surface 9 and a convex shape on the back surface 10,
The intersections B2 and C2 with the ridge 8 are convex on the ventral surface 9 and the back surface 10
In the figure, the concave shape is gradually curved to form a gentle S-shaped curved shape as a whole. The bending lines A, B and C are the intersection points A on the blade edge 7 side.
At the time of working a tilling claw passing through 1, B1 and C1, the points A2, B2 and C2 on the ridge edge 8 side from the trochoidal curves A ', B' and C'are respectively curved so as to come to the inside of rotation. The tiller claw 3 having such a structure is attached to the tiller claw shaft 1 through the claw mounting box 2, and the work is performed at a vehicle speed of 2 km / h, a maximum turning radius of the tiller claw 3 of 250 mm, and a radius of the tiller claw shaft 1 of 26.5 mm, for example. Rotating outer peripheral point R (trochoidal curve) of the plowing pawl 3 and the axis O of the plowing pawl shaft 1 (straight line), an arbitrary point P on the outer periphery thereof
The locus of movement of the (cycloid curve) is as shown by r2, r0, r1 in FIG. Then, when the plowing work is performed in this state, the vertical blade portion 5 of the blade body is driven into the soil substantially along the trochoidal curve r2 and moves to one side from the plane orthogonal to the axis of the plowing claw shaft 1. Sequentially cut away, and at the horizontal blade portion 6,
The bent section has a gentle concave shape on the abdominal surface 9 side on the side with a small radius of gyration, and comes to the inside of the trochoid locus of rotation, so the soil cut with the blade edge 7 can be held without hitting strongly on the ridge edge 8 side. As it is inserted, it is thrown backwards and cultivated. And on the side where the turning radius is large, the intersection point with the blade edge 7
The B1 and C1 sides have a concave shape on the ventral surface 9 and a convex shape on the back surface 10, and the intersection points B2 and C2 with the ridge 8 have a convex shape on the abdominal surface 9,
Since the back surface 10 is gradually curved like a concave shape, and is curved like a gentle S-shape as a whole,
The reaction force on the blade edge 7 side when driven is canceled by the reaction force on the ridge edge 8 side, and the reaction force as a whole becomes relatively small,
The soil can be cultivated and thrown laterally and backward without increasing the tilling reaction force. To describe the operation of the horizontal blade portion 6 in more detail,
For a bending line A (A1-A2) with a small radius of gyration and a relatively small degree of curvature of the bending cross section, a bending radius of A2 is smaller than that of A1, and a bending cross section of A1 and A2 has the same curvature. If so, the reaction force at A2 becomes large, and the reaction force is made small by making the curvature of the bending cross section at this position gentle. Next, in the bend line B (B1-B2), the bend line A
If you want to bend the curvature of the same bending cross section as
Since a bending force is applied to the tip of the blade, the reaction force at point B2 will be much larger than the reaction force at point A2, but as shown in Fig. 2 (b), the intersection point B1 with blade edge 7 , C
The side 1 has a concave shape on the abdominal surface 9 and a convex shape on the back surface 10, and the intersections B2 and C2 with the ridge 8 have a convex shape on the abdominal surface 9 and a concave shape on the back surface 10, gradually curving, and a gentle S as a whole. As it is curved like a letter, B1
The reaction force at point B2 is canceled by the reaction force at point B2, and the reaction force at point B2 becomes smaller. Further, the bending line C also has a gentle S-shaped cross-section like the bending line B, so that the reaction force at the point C2 is small, and the horizontal blade portion 6 as a whole does not generate a large reaction force. The sides of the bending lines A, B, C on the ridges A2, B2, C2 are set to have a smaller radius of gyration than the trochoidal loci A ', B', C'passing A1, B1, C1 on the blade edge 7 side. Therefore, the soil cut by the blade edge 7 is thrown backward and cultivated so that it is held on the sides of the ridges A2, B2, C2.

【The invention's effect】

As described above, according to the tillage claw of the present invention, the cross-sectional shape of the bending line A that passes the starting end portion of the horizontal blade portion 6 obliquely from the blade edge 7 side to the ridge edge 8 side has a concave shape on the ventral surface 9 side. None, in the back surface 10 on the opposite side, the curve is gradually and gently curved so as to form a convex shape, and is substantially parallel to the above-mentioned bending line A, and the bending lines B and C that obliquely pass through the central portion and the end portion of the horizontal blade portion 6 are formed. The cross-sectional shape is
As it goes from the bending line A to the tip side of the horizontal blade portion 6, the blade edge 7
The intersections B1 and C1 with the concave surface on the ventral surface 9 are convex, and the back surface 10 is convex, and the intersections B2 and C2 with the ridge 8 are convex on the abdominal surface 9 and concave on the rear surface 10. Since it is curved so as to form a gentle S-shape as a whole, the plowing reaction force on the blade edge 7 side is canceled by the plowing reaction force on the bump edge 8 side, and plowing from the vertical blade portion 5 to the tip of the horizontal blade portion 6 is performed. The reaction force is small, and it is possible to perform plowing, cultivating soil, and earth-filling work with less required power. Further, as a result, the vibration of the machine body is reduced, and the rotary tiller and the tractor that pulls the rotary tiller and transmits the power are not adversely affected. further,
Since the plowing reaction force of the side blades, which are easily damaged, is small, the damage of the whole plowing nail is small, the thickness can be made thin, and the weight of the whole nail can be reduced.

[Brief description of drawings]

1 to 3 each (a) is a side view of the state where the plowing claw of the present invention is mounted on the plowing claw shaft, and (b) is
II line (A), II-II line (B), and II of (a), respectively.
FIG. 4 is a sectional view taken along the line I-III (C), and FIG. 4 is an explanatory view of the action of the tilling claw of the present invention. 1 ... Tilling claw shaft, 2 ... Claw mounting box, 3 ... Tilling claw, 4 ... Mounting base, 5 ... Vertical blade, 6 ... Horizontal blade, 7
…… Blade edge, 8 …… Mine edge, 9 …… Abdominal surface, 10 …… Back surface, A…
… Bending line of horizontal blade, B, C… Bending line that is substantially parallel to bending line A, A ′, B ′, C ′… Bending line A, B, C points A1, B1, C1 Trochoid locus.

Claims (1)

(57) [Claims] 1. A vertical blade part (5) and a horizontal blade part (6) are formed continuously from a mounting base part (4) to a tillage claw shaft (1), and the horizontal blade part (5) is formed from the vertical blade part (5). 6) In the tiller claw (3) in which the portion leading to the tip is curved with a gentle curvature so as to gradually move away from the plane orthogonal to the axis of the tiller axis (1) toward the one end as it reaches the tip, The cross-sectional shape of the bending line (A) that passes the starting end of the blade portion (6) obliquely from the blade edge (7) side to the bump edge (8) side has a concave shape on the ventral surface (9) side, and the back surface on the opposite side. In (10), the curved line is gradually and gently curved so as to form a convex shape, is substantially parallel to the bending line (A), and obliquely passes through the central portion and the end portion of the horizontal blade portion (6) (B) and The cross-sectional shape of (C) is located at the intersection (B1) and (C1) side with the blade edge (7) on the ventral surface (9) as it goes from the bending line (A) to the tip side of the horizontal blade portion (6). Concave, a convex shape in the back (10), the intersection of the Mineen (8) (B2), (C2) side of the ventral surface (9)
A plowing nail characterized by being gradually curved so as to form a convex shape on the back side and a concave shape on the back surface (10), and curved to form a gentle S shape as a whole.