JP4814593B2 - Tillage nail - Google Patents

Description

  The present invention relates to a tilling claw that is attached to and used on a claw shaft (cultivation shaft) of a rotary tilling device, and more particularly to a tilling claw suitable for performing cultivation work in paddy fields and fields.

  The tilling nail that performs the tilling work has a vertical blade portion and a horizontal blade portion that continuously extend from the mounting base portion that is attached to the tilling nail shaft, and is curved in the direction opposite to the rotation direction from the vertical blade portion to the horizontal blade portion, One in which the side blade portion is curved to one side is known. Such a tilling nail is cut and crushed by the vertical blade part, and is reversed and released in addition to the cutting and crushed earth by the horizontal blade part. Further, since the horizontal blade portion of the tilling claw is provided on the tip side from the vertical blade portion, the rotation radius of the horizontal blade portion is larger than that of the vertical blade portion. For this reason, a larger torque acts on the horizontal blade portion than on the vertical blade portion.

  Such a tilling nail (hereinafter referred to as “conventional nail A (70)”) has a conventional nail A (70) as shown in FIGS. 4 (a) (side view) and (b) (bottom view). There exists a thing of patent document 1 in which the front-end | tip part was formed in linear form. Since this conventional claw A (70) is configured such that the position R1 that is the point of application of the maximum turning radius Rm and the position that has the maximum cutting width H1 are on the same straight line, the conventional claw A (70). The maximum torque acts on the tip of the. For this reason, this conventional nail | claw A (70) has the problem that tillage resistance increases, required power becomes large, and a vibration tends to generate | occur | produce. For this reason, it is necessary to make small the torque which acts on the front-end | tip part of nail | claw A (70) conventionally.

Therefore, by forming a leading end portion of the tillage耘爪the curved, by the width of cut of the position R2 as the maximum rotation radius Rm to the maximum cutting width H1 of smaller cutting width H2, the maximum rotation radius Rm position R2 And the position R1 at which the maximum cutting width H1 is set as another position, the torque acting on the tilling nail is dispersed and reduced to reduce the tilling resistance (hereinafter referred to as “conventional nail B (80)”). ) Is proposed in Patent Document 2.

JP-A-53-117502 JP-A-62-210903

The torque acting on the lateral edge portion 81 of the conventional claw B (80), will be described with reference to FIG. In FIG. 5 , the vertical axis represents torque and the horizontal axis represents position. R2 on the horizontal axis is a position where the maximum rotation radius Rm of the conventional claw B is reached, R1 is a position R1 where the maximum rotation radius Rm of the conventional claw A is described above, and L1 is a position where the maximum cutting width H1 is reached. . These positions R2, R1, and L1 move within the cultivated soil in the order of R2, R1, and L1, when the conventional claw B (80) rotates.

  As is apparent from this graph, the torque acting on the conventional claw B indicated by the solid line is smaller than that of the conventional claw A indicated by the two-dot chain line. Therefore, the torque acting on the conventional nail B is smaller than that of the conventional nail A, and the tillage resistance of the conventional nail B is reduced as compared with that of the conventional nail A. However, although the tillage resistance of the conventional nail B has been reduced, it is still large, and it is difficult to solve the conventional problem that the required power is large and vibration is likely to occur.

  An object of the present invention is to provide a tilling claw having a low tillage resistance. An object of the present invention is to provide a tilling claw that meets such a demand.

In order to achieve the above object, the tilling claw of the present invention has a vertical blade portion and a horizontal blade portion that continuously extend from a mounting base attached to the tilling shaft, and is opposite to the rotation direction from the vertical blade portion to the horizontal blade portion. In the tilling nail that is curved in the direction and the horizontal blade portion is curved to one side, the position that becomes the maximum turning radius and the position that becomes the maximum cutting width are different positions, and the tip portion of the horizontal blade portion is curved is formed to become a straight portion extending to a maximum cutting width a position side from the position where the maximum rotational radius, forming the cutting edge entry angle between Kodo surface and the straight portion at the position where the maximum rotational radius of 50 ° or more It is characterized by being.

In the present invention, when the angle (cutting angle) formed by the edge curve and the locus curve is in the range of 50 ° to 55 °, the tilling torque when the tilling nail is driven into the cultivated soil is minimized, and the cutting angle is set to 50 °. The following is a technique in which the tilling torque increases rapidly and the tilling torque becomes almost constant when the cutting angle is 55 ° or more is used for the tip of the tilling nail. In other words, the present invention provides a tilling that works when the tip of the nail is driven into the cultivated soil by setting the angle formed with the cultivated soil surface at the position of the maximum turning radius, that is, the blade tip entry angle to 50 ° or more. Torque is reduced. Further, the present invention reduces the torque acting on the tilling nail by distributing the torque acting on the tilling nail by making the position where the maximum turning radius of the horizontal blade portion and the position becoming the maximum cutting width are different positions. can do. Further, by providing a straight line portion extending from the position having the maximum turning radius to the position side having the maximum cutting width at the distal end portion of the side blade portion formed in a curved shape, the blade edge entry angle can be increased. For this reason, the tilling nail of the present invention reduces torque at the tip of the nail by making the position of the maximum turning radius different from the position of the maximum cutting width, and reduces torque by changing the blade tip entry angle. In combination with this, it is possible to further reduce the tillage torque acting on the entire tillage nail and to reduce the tillage resistance. As a result, the required power can be reduced and the occurrence of vibration can be reduced.

  Further, the present invention is characterized in that the blade tip entry angle formed with the cultivated soil surface at the position where the maximum turning radius is 50 ° to 55 °.

  According to the present invention, by setting the blade tip entry angle to 50 ° to 55 °, the tillage resistance when the tip of the tilling nail is driven into the cultivated soil can be minimized, and as a result, the tip of the nail The torque acting on can be made smaller.

According to the tilling nail according to the present invention, the position of the maximum turning radius and the position of the maximum cutting width are set at different positions, and the tip of the side blade portion is formed in a curved shape and is maximum from the position at which the maximum turning radius is reached. A tilling claw with a small tillage resistance by having a straight part extending to the position to be the cutting width and making the blade tip entry angle between the soil surface and the straight part at the position of the maximum turning radius 50 ° or more Can be provided.

  Hereinafter, the tilling nail | claw which concerns on this invention is demonstrated with reference to FIGS. 1-3. The tilling claw of the present embodiment is used for a tractor-mounted side drive type or center drive type rotary tiller, a rotary tiller of a tiller, or the like.

  As shown in FIG. 1A (side view), the tilling claw 1 includes a mounting base 3 having a mounting hole 3 a and a rectangular cross section, and a vertical blade portion 10 via a connecting portion 5 on the mounting base 3. And the side blade part 20 is formed continuously. In addition, the dashed-two dotted line of Fig.1 (a) shows the expanded view when the tilling nail | claw 1 of this invention which curves to one side is expand | deployed flatly.

  The tilling claw 1 is attached to the tilling claw shaft 60 by means of bolt fastening means or the like and rotated in the direction of arrow A to perform the tilling work. The tilling claw 1 is curved in the direction opposite to the rotation direction from the vertical blade portion 10 to the horizontal blade portion 20, and the tip portion is curved to one side (front side on the paper surface) with a substantially constant curvature radius r so that a rake face 21 is formed. Is formed. Blade edge portions 10a and 20a having a substantially constant width are formed on the front side in the rotational direction of the vertical blade portion 10 and the horizontal blade portion 20, respectively.

  The cutting into the cultivated soil by the rotation of the tillage claw 1 in the direction of arrow A is performed from the blade edge 10a of the vertical blade 10 so that the side force is supported and at the same time the entanglement of weeds is prevented by the nail itself. Therefore, the blade edge portions 10a and 20a are formed so as to form an appropriate discharge angle.

  As shown in FIGS. 1A and 1B (bottom view), the distal end portion of the horizontal blade portion 20 has a position R2 that is the maximum rotation radius Rm of the tillage claw 1 and a position L1 that is the maximum cutting width H1. The tip surface 22 of the side blade portion 20 located at another position between the position R2 at which the maximum turning radius Rm is reached and the position L1 at which the maximum cutting width H1 is formed is formed with a straight line portion 25 extending from the position R2. The blade tip entry angle α formed with the cultivated soil surface at the position R2 is formed to have a magnitude of 55 °. The blade edge entry angle α refers to an angle formed with the cultivated soil surface when the cultivating claw 1 rotates in the direction of arrow A and the tip of the side blade portion 20 is driven into the cultivated soil.

  As described above, since the position R2 having the maximum turning radius Rm and the position L1 having the maximum cutting width H1 are in different positions, the torque acting on the tilling claw 1 is dispersed and the torque acting on the tilling claw 1 is reduced. Can do.

  Further, by forming the front end surface 22 of the horizontal blade portion 20 with the straight portion 25 extending from the position R2, a curve is formed in a convex shape between the position R2 that is the maximum turning radius and the position that is the maximum cutting width H1. Compared with the case of the conventional claw B (80) shown in FIG. 4, the blade edge entry angle α at the claw tip of the side blade portion 20 can be increased, and as a result, it acts on the tip of the side blade portion 20. Torque can be reduced.

  Further, when the blade tip entry angle α made with the cultivated soil surface at the position R2 of the maximum rotation radius Rm that becomes the tip of the linear portion 25 is 55 °, the torque that acts when the linear portion 25 is driven into the cultivated soil is minimized. can do. As shown in FIG. 2, when the angle (cutting angle) formed by the blade edge curve and the trajectory curve of the tilling claw 1 is in the range of 50 ° to 55 °, the tilling torque is minimized and the cutting angle is 50 ° or less. In this case, a well-known technique in which the tilling torque increases rapidly and the tilling torque becomes almost constant when the cutting angle is 55 ° or more is used for the nail tip of the tilling nail 1. As a result, as shown in FIG. 3, compared with the case of the conventional nail A and the case of the conventional nail B described above, the torque that is applied when the tip of the cultivation nail 1 is driven into the cultivated soil In the process of the tip of the tillage nail 1 corresponding to the distance from the position R2 to the position R1 (the tip position of the conventional nail A shown in FIG. 4A) of the conventional nail A and the conventional nail B It can be made smaller. Note that the blade edge entry angle α is not limited to 55 °, and may be any size within a range of 50 ° to 55 °. The straight line portion 25 may be a part of a range from the position R2 to the position L1.

  Thus, the tilling claw 1 of the present invention reduces the torque at the tip of the claw by setting the position R2 that is the maximum turning radius and the position L1 that is the maximum cutting width H1, and between these positions. Reduction of the torque acting on the tip of the nail due to the provision of the straight portion 25 and reduction of the torque by making the blade tip entry angle 50 ° or more are performed, and the tilling torque acting on the entire tilling nail is made smaller. Can reduce tillage resistance. As a result, the required power can be further reduced, and the occurrence of vibration can be reduced.

The cultivation nail | claw concerning one embodiment of this invention is shown, The figure (a) is a side view of a cultivation nail, The figure (b) is a bottom view of a cultivation nail. It is a graph which shows the torque characteristic by the cutting angle of a tilling nail. It is a graph which shows the torque characteristic by the position in the front-end | tip part of a tilling nail. The conventional tilling nail is shown, The figure (a) is a side view of the conventional tilling nail, The figure (b) is a bottom view of the conventional tilling nail. It is a graph which shows the torque characteristic by the position in the front-end | tip part of the conventional tilling nail.

DESCRIPTION OF SYMBOLS 1 Tillage claw 3 Mounting base 10 Vertical blade part 20 Horizontal blade part 22 Tip surface (tip part)
25 Straight part 60 Tillage claw axis H1 Maximum cutting width L1, R2 Position Rm Maximum turning radius

Claims (2)

The blade has a vertical blade portion and a horizontal blade portion that continuously extend from an attachment base attached to the tilling claw shaft, and is curved in the direction opposite to the rotation direction from the vertical blade portion to the horizontal blade portion. In the tilling nail curved to the side,
Maximum rotation radius a position and a maximum cutting width a position has a different position, the lateral edge portions located side tip with a maximum cutting width from the position is formed in a curved shape becomes the maximum radius of rotation A tilling claw characterized in that it has a straight part extending inward and has a blade tip entry angle formed by the straight soil part and the cultivated soil surface at the position where the maximum turning radius is 50 ° or more.   The tilling nail according to claim 1, wherein a blade edge approach angle made with the soil surface at a position where the maximum turning radius is set is 50 ° to 55 °.

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