JP2019024354A - Agricultural work machine - Google Patents

Abstract

To keep work efficiency of a rear side work rotor without reducing the number of tilling tines.SOLUTION: An agricultural work machine is attached to the back of a traveling machine body and is drawn by the traveling machine body to till a farm field. The agricultural work machine comprises: a first work rotor including a plurality of first tilling tines disposed around a first tine shaft, the first work rotor rotating while taking the first tine shaft as its rotation axis as the traveling machine body travels; a second work rotor including a plurality of second tilling tines disposed around a second tine shaft, the second work rotor rotating while taking the second tine shaft as its rotation axis as the first work rotor rotates; and a transmission mechanism for accelerating and transmitting rotation of the first work rotor to the second work rotor. The rotation diameter of the second work rotor is smaller than that of the first work rotor. The number of the second tilling tines disposed around the second tine shaft is equal to or larger than the number of the first tilling tines disposed around the first tine shaft.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an agricultural machine. In particular, the present invention relates to a farm work machine including a work rotor for plowing a farm field.

  2. Description of the Related Art Conventionally, there is known an agricultural machine that is attached to a rear portion of a tractor via a hitch mechanism and obtains a driving force by being pulled by the tractor. For example, the agricultural working machine described in Patent Document 1 is attached to the rear part of a tractor and pulled to rotate a front-side work rotor, and the power is transmitted to a rear-side work rotor via a chain mechanism. It has a structure. In the agricultural machine having such a structure, the front and rear work rotors rotate as the tractor travels, so that the tilling claws provided on the respective work rotors plow the field.

  The agricultural machine described in Patent Document 1 is configured such that the rear working rotor rotates at a speed of 2 to 4 times with respect to the front working rotor by adjusting the gear ratio. This is because the work efficiency of the rear working rotor is improved by increasing the rotation speed of the rear working rotor.

U.S. Pat. No. 4,492,273

  However, when the rotational speed of the rear working rotor is increased, the rotational load on the rear working rotor increases, and the front working rotor may slide on the field scene. In this case, since the rear working rotor does not rotate while the front working rotor is sliding, there is a problem that work efficiency is lowered as a result.

  In order to reduce the rotational load on the rear working rotor, it is possible to reduce the number of tilling claws. However, if the number of tilling nails is reduced, the work efficiency will decrease.

  Therefore, an object of the present invention is to maintain the work efficiency of the rear working rotor without reducing the number of tilling claws.

  A farm working machine according to an embodiment of the present invention is attached to a rear portion of a traveling machine body and is pulled by the traveling machine body to cultivate a farm field, and a plurality of first tilling claws are arranged with respect to a first claw shaft. A first working rotor that rotates with the first claw shaft as a rotation axis as the traveling machine body travels, and a plurality of second tillage claws with respect to the second claw shaft. A second working rotor that rotates with the second claw shaft as a rotating shaft in accordance with the rotation; and a speed change mechanism that transmits the rotation of the first working rotor to the second working rotor at an increased speed, The rotation diameter of the second work rotor is smaller than the rotation diameter of the first work rotor, and the number of the second tilling claws arranged around the axis of the second claw shaft is around the axis of the first claw axis. Or more than the number of the first tilling claws disposed on the surface.

  When the rotation diameter of the second working rotor is 1, the rotation diameter of the first working rotor may be larger than 1.0 and 1.5 or less (for example, 1.2 or less). .

  The rotational speed of the second working rotor may be 2 to 4 times the rotational speed of the first working rotor.

  The rotation space formed by the rotation of the first work rotor and the rotation space formed by the rotation of the second work rotor may have their lowermost ends positioned substantially on the same plane.

  The speed change mechanism may include a roller chain and a plurality of sprockets, or may include a plurality of spur gears.

  The shape of the first tillage claw may be different from the shape of the second tillage claw.

  The second tillage claw may have a blade portion that continuously extends from an attachment base attached to the second claw shaft and curves in one direction.

  According to the present invention, the work efficiency of the rear working rotor can be maintained without reducing the number of tilling claws.

It is the schematic which looked at the agricultural working machine in one Embodiment from the diagonally upper left of the back side. It is the schematic which looked at the agricultural machine in one Embodiment from the upper part. It is the schematic which looked at the agricultural working machine in one Embodiment from diagonally upward of the front side. It is a side view which shows the structure of the transmission mechanism of the agricultural machine in one Embodiment. It is a side view which shows the outline of a structure of the tilling nail | claw in the 1st work rotor of the agricultural working machine in one Embodiment, and a 2nd work rotor. It is a figure which shows the structure of the 1st tilling nail | claw used for the 1st working rotor of the agricultural working machine in one Embodiment. It is a figure which shows the structure of the 2nd tilling nail | claw used for the 2nd working rotor of the agricultural working machine in one Embodiment.

  Hereinafter, an embodiment of an agricultural machine according to the present invention will be described with reference to the drawings. However, the agricultural machine of the present invention can be implemented in many different modes, and is not construed as being limited to the description of the examples shown below. Note that in the drawings referred to in this embodiment, the same portions or portions having similar functions are denoted by the same reference numerals, and repetitive description thereof is omitted.

  For convenience of explanation, words indicating directions such as upward, downward, forward, backward, rightward, and leftward are used, but the direction in which gravity works is downward, and vice versa. The traveling direction of the traveling machine body is the front, and the reverse is the rear. Furthermore, toward the front, the right side is right and the left side is left.

  In the present specification, a tilling work machine including a work rotor will be described as an example of a farm work machine. However, the present invention can be applied to all farm work machines including at least two work rotors.

<Embodiment>
(Composition of farm equipment)
A configuration of the agricultural machine 100 according to the present embodiment will be described. In the present embodiment, an example of a farming machine 100 that is attached to the rear part of a traveling machine body such as a tractor and that is pulled by the traveling machine body to plow a farm field is illustrated.

  FIG. 1 is a schematic view of the agricultural working machine 100 according to the first embodiment as viewed from the upper left side on the rear side. FIG. 2 is a schematic view of the agricultural machine 100 according to the first embodiment as viewed from above. FIG. 3 is a schematic view of the agricultural working machine 100 according to the first embodiment as viewed from obliquely upward on the front side. 1 to 3 show a schematic configuration of the agricultural working machine 100 according to the present embodiment, and some components are not shown for convenience of explanation.

  The farm work machine 100 of this embodiment is roughly divided and includes a mounting part 10, a tilling work part 20, and a pressure reducing work part 30. Hereinafter, each part will be described in detail.

  The mounting portion 10 includes a top mast 11, a pair of lower links 12a and 12b, a pair of support members 13a and 13b, and a pair of connecting members 14a and 14b.

  The support members 13 a and 13 b are fixed to the first support frame 21 and the second support frame 22 of the tillage working unit 20 and support the top mast 11. The lower links 12 a and 12 b are directly fixed to the first support frame 21. The connecting members 14a and 14b connect the top mast 11 and the lower links 12a and 12b.

  The top mast 11 and the lower links 12a and 12b are connected to a three-point link mechanism (not shown) provided at the rear of the traveling machine body such as a tractor. Since the structure of the three-point link mechanism is well-known, description here is omitted. By connecting the mounting part 10 to the three-point link mechanism of the traveling machine body, the agricultural working machine 100 of this embodiment is mounted on the rear part of the traveling machine body.

  The tilling work unit 20 includes a first support frame 21, a second support frame 22, a pair of side plates 23a and 23b, a shield cover 24, a first work rotor 25, a second work rotor 26, a plurality of subsoilers 27, and a pair of restrictions. Members 29a and 29b and a transmission mechanism 40 to be described later are provided. In FIG. 1, the speed change mechanism 40 is indicated by a dotted line and is covered with a cover member 41.

  The first support frame 21 and the second support frame 22 are connected to the side plates 23a and 23b and support the side plates 23a and 23b. Further, as described above, the first support frame 21 and the second support frame 22 support the top mast 11 via the support members 13a and 13b. The first support frame 21 further supports the lower links 12a and 12b.

  Further, the first support frame 21 supports a plurality of subsoilers 27. The plurality of subsoilers 27 are detachably fixed to the first support frame 21 via fixing members 28, respectively. The subsoiler 27 is a component that crushes and softens the subsoil (also referred to as lower layer soil) as the traveling machine body travels, and is disposed at a predetermined interval with respect to the first support frame 21. The fixing member 28 can be attached to an arbitrary position of the first support frame 21.

  A first work rotor 25 and a second work rotor 26 are installed between the side plates 23a and 23b. The shield cover 24 is installed between the side plates 23 a and 23 b and covers the first work rotor 25 and the second work rotor 26. The shield cover 24 plays a role of preventing upward scattering of soil blocks during the tilling work of the first work rotor 25 and the second work rotor 26.

  Further, regulating members 29a and 29b are attached to the side plates 23a and 23b, respectively. These regulating members 29a and 29b function as means for regulating the vertical movement of a pair of first support arms 33a and 33b that support a first basket roller 31 described later.

  The first working rotor 25 includes a first claw shaft 25a and a plurality of first tilling claws 25b. A plurality of first tilling claws 25b are arranged around the shaft at a predetermined mounting position of the first claw shaft 25a. In the present embodiment, six first tilling claws 25b are arranged for one mounting position. A plurality of mounting positions of the first tilling claws 25b are provided at a predetermined interval in the longitudinal direction of the first pawl shaft 25a.

  The second working rotor 26 includes a second claw shaft 26a and a plurality of second tilling claws 26b. Similar to the first work rotor 25, a plurality of second tillage claws 26b are also arranged around the axis at a predetermined mounting position of the second claw shaft 26a. In the present embodiment, six second tilling claws 26b are arranged for one mounting position. Also, a plurality of mounting positions of the second tillage claw 26b are provided at a predetermined interval in the longitudinal direction of the second claw shaft 26a.

  In the present embodiment, the first tillage claw 25b is attached to the first claw shaft 25a with a phase shifted between adjacent attachment positions. That is, when the first work rotor 25 is viewed from the direction (left-right direction) along the first claw shaft 25a, the plurality of adjacent first tilling claws 25b at each mounting position are from one side of the first claw shaft 25a. It arrange | positions helically toward the other side. The second tillage claw 26b is also mounted on the second claw shaft 26a with the same configuration. Thereby, while the resistance at the time of tilling of the 1st working rotor 25 and the 2nd working rotor 26 can be made small, the uniform agricultural field surface with few unevenness | corrugations can be obtained.

  Moreover, the 1st nail | claw axis | shaft 25a and the 2nd nail | claw axis | shaft 26a are rotatably attached via the bearing etc. with respect to the side plates 23a and 23b, respectively. Further, the first claw shaft 25 a and the second claw shaft 26 a can be interlocked with each other via the speed change mechanism 40. In the present embodiment, the speed change mechanism 40 is provided on the side plate 23 a and the periphery thereof is protected by the cover member 41.

  In the present embodiment, the speed change mechanism 40 has a function of increasing the rotation speed of the second work rotor 26 more than the rotation speed of the first work rotor 25 (in that sense, it may be referred to as a “speed increase mechanism”). ). For example, in the present embodiment, the speed change mechanism 40 causes the second working rotor 26 to rotate at a speed that is two to four times that of the first working rotor 25 (specifically, about three times). In the present embodiment, the speed change mechanism 40 is configured by combining a plurality of sprockets having different sizes and a roller chain installed on the plurality of sprockets. However, not limited to this, the speed change mechanism 40 may be a gear mechanism configured by combining a plurality of gears having different numbers of teeth. The speed change mechanism 40 may be a known CVT mechanism (stepless speed change mechanism) such as a belt-type CVT in which a metal belt and a variable diameter pulley are combined.

  The pressure reducing operation unit 30 includes a first basket roller 31, a second basket roller 32, a pair of first support arms 33a and 33b, and a pair of second support arms 34a and 34b.

  The first basket roller 31 has a structure in which a plurality of flat bars 31b are installed on a plurality of ring-shaped support members 31a. Similarly, the second basket roller 32 has a structure in which a plurality of flat bars 32b are installed on a plurality of ring-shaped support members 32a. Although not shown in the present embodiment, both the support member 31a and the support member 32a have a rotation shaft inside an opening provided near the center. That is, the first basket roller 31 and the second basket roller 32 rotate around a rotation shaft (not shown).

  In the agricultural working machine 100 according to the present embodiment, when the traveling machine body travels forward as it travels, the first basket roller 31 and the second basket roller 32 travel while rotating after the plowing work unit 20 has passed. At that time, the plurality of flat bars 31b and 32b are configured to crush and crush the soil blocks in the field cultivated by the tilling work unit 20.

  The first basket roller 31 is rotatably supported by the first support arms 33a and 33b. One end of the first support arms 33a and 33b is rotatably connected to the side plates 23a and 23b, and the other end is connected to a rotating shaft (not shown) of the first basket roller 31. As described above, the vertical movement of the first support arms 33 a and 33 b can be restricted by the restriction members 29 a and 29 b provided in the tilling work unit 20.

  The second basket roller 32 is rotatably supported by a pair of second support arms 34a and 34b. One ends of the second support arms 34a and 34b are rotatably connected to the first support arms 33a and 33b, and the other ends are connected to a rotation shaft (not shown) of the second basket roller 32. In the present embodiment, since one end of the second support arms 34a and 34b is rotatably connected to the first support arms 33a and 33b, the first basket roller 31 and the second basket roller 32 can move in the vertical direction. There is freedom.

  Further, for example, an electric cylinder or the like is installed between the second support frame 22 (or the first support frame 21) and the second support arms 34a and 34b, and the second basket roller 32 can be lifted to an arbitrary position. It is good also as a structure. In this case, it is possible to perform soil crushing and crushing in the field with only the first basket roller 31. Further, in the case of such a structure, since the load of the second basket roller 32 is applied to the first basket roller 31, it is possible to improve the pressure suppressing performance of the first basket roller 31.

  As described above, the agricultural working machine 100 of the present embodiment is pulled as the traveling machine body travels, and cultivates the field surface by the action of the first work rotor 25 and the second work rotor 26. The soil blocks in the field cultivated by the first work rotor 25 and the second work rotor 26 are crushed and crushed by the action of the first basket roller 31 and the second basket roller 32.

  At this time, the rotation speed of the second work rotor 26 is increased by the speed change mechanism 40 more than the rotation speed of the first work rotor 25. For example, in the agricultural working machine 100 of the present embodiment, the second work rotor 26 rotates at a speed approximately three times that of the first work rotor 25. Therefore, it is possible to rapidly cultivate the farm field by moving a traveling machine body such as a tractor at a high speed.

(Configuration of transmission mechanism)
Next, a specific configuration of the speed change mechanism 40 in the agricultural machine 100 according to the present embodiment will be described. FIG. 4 is a side view showing the configuration of the speed change mechanism 40 in the agricultural machine 100 according to the first embodiment. In the present embodiment, the speed change mechanism 40 includes a first sprocket 40a, a second sprocket 40b, and a roller chain 40c. Note that the present invention is not limited to this configuration, and a tensioner for applying a predetermined tension to the roller chain may be provided.

  The first sprocket 40a is connected to the first claw shaft 25a via a bearing mechanism using an involute spline or the like. When the agricultural working machine 100 is pulled forward as the traveling machine body travels, the first tilling claw 25b of the first working rotor 25 receives resistance from the field and rotates the first claw shaft 25a. The rotation of the first claw shaft 25a is transmitted to the first sprocket 40a as rotational power.

  The rotational power transmitted to the first sprocket 40a is transmitted to the second sprocket 40b via the roller chain 40c. Similarly to the first sprocket 40a, the second sprocket 40b is connected to the second claw shaft 26a via a bearing mechanism using an involute spline or the like. Thereby, the 2nd nail | claw axis | shaft 26a also rotates in response to rotation of the 1st nail | claw axis | shaft 25a, and the 2nd tilling nail | claw 26b with which the 2nd nail | claw axis | shaft 26a was mounted | worn rotates.

  As described above, the rotational power obtained by the first working rotor 25 is transmitted to the second working rotor 26 via the first sprocket 40a, the roller chain 40c, and the second sprocket 40b.

  At this time, the number of teeth of the second sprocket 40b is designed to be smaller than the number of teeth of the first sprocket 40a. Specifically, the gear ratio of the second sprocket 40b to the first sprocket 40a is designed to be 2 or more and 4 or less (preferably 2.5 or more and 3.5 or less). That is, the speed change mechanism 40 increases the rotation of the first work rotor 25 (that is, the rotation speed of the first claw shaft 25a) to, for example, 2 times or more and 4 times or less and transmits the speed to the second work rotor 26.

  Thus, since the 1st work rotor 25 and the 2nd work rotor 26 are connected via the speed change mechanism 40, the agricultural work machine 100 of this embodiment connects the 2nd work rotor 26 to 2 of the 1st work rotor 25. It can be rotated at a speed of from 2 times to 4 times (preferably from 2.5 times to 3.5 times). That is, since the second work rotor 26 rotates at a higher speed than the first work rotor 25, the work efficiency with respect to the field is high.

  However, as described above, when the rotational speed of the rear working rotor is increased, the rotational load of the rear working rotor increases, and there is a problem that the front working rotor slides in the field. Therefore, in this embodiment, this problem is solved by making the rotation diameter of the second work rotor 26 smaller than the rotation diameter of the first work rotor 25.

(Working rotor configuration)
FIG. 5 is a side view showing an outline of the configuration of tilling claws in the first work rotor 25 and the second work rotor 26. In the first working rotor 25 of the present embodiment, six first tilling claws 25b are arranged around the shaft at one mounting position of the first claw shaft 25a. Similarly, in the second working rotor 26, six second tilling claws 26b are arranged around the shaft at one mounting position of the second pawl shaft 26a. However, the number of tilling claws shown here is only an example, and the present invention is not limited to this. For example, the number of second tilling claws 26b arranged around the axis of the second claw shaft 26a can be greater than or equal to the number of first tilling claws 25b arranged around the axis of the first claw axis 25a.

  Here, in this specification, the diameter of the outer edge of the rotation space formed by the rotation of the tillage claw (that is, the rotation locus drawn by the tip portion of the tillage claw) is defined as the “rotation diameter”. According to this definition, the diameter of the outer edge 250 of the rotation space formed by the rotation of the first tillage claw 25b, that is, the rotation diameter of the first working rotor 25 is represented by H1. Similarly, the diameter of the outer edge 260 of the rotation space formed by the rotation of the second tillage claw 26b, that is, the rotation diameter of the second working rotor 26 is represented by H2.

  As shown in FIG. 5, in the agricultural working machine 100 of the present embodiment, the rotation diameter H <b> 2 of the second work rotor 26 is smaller than the rotation diameter H <b> 1 of the first work rotor 25. Since the moment of force is proportional to the distance from the rotation axis (rotation center), the force (that is, torque) for rotating the second working rotor 26 is smaller than that of the first working rotor 25. That is, in this embodiment, the rotational load of the second work rotor 26 is reduced by making the rotation diameter H2 of the second work rotor 26 smaller than the rotation diameter H1 of the first work rotor 25.

  For example, when the rotation diameter of the second work rotor 26 is 1, the rotation diameter of the first work rotor 25 is set to be larger than 1.0 and 1.5 or less (for example, 1.2 or less). do it. However, this is only an example and does not prevent the ratio of the rotational diameters from exceeding 1.5. Since the rotational load changes depending on the shape of the second tillage claw 26b, in view of the purpose of reducing the rotational load of the second working rotor 26, if the ratio of the rotational diameters is appropriately set according to the rotational load, Good.

  As described above, in this embodiment, the first working rotor 25 and the second working rotor 26 have different shapes of tilling claws, and the rotational diameter of the second working rotor 26 is intentionally reduced. In other words, the second working rotor 26 is designed such that the rotation diameter of the second working rotor 26 is reduced by using a tilling claw having a shorter overall length than the first tilling claw 25b as the second tilling claw 26b.

  Therefore, the rotational load on the second working rotor 26 can be reduced without taking measures such as reducing the number of claws as in the prior art. In other words, the work efficiency of the second working rotor 26 is maintained while arranging the same number of tilling claws as the number of mounting positions of the first claw shaft 25a with respect to the mounting position of the second claw shaft 26a. can do.

  As shown in FIG. 5, in the present embodiment, the outer edge 250 of the rotation space formed by the rotation of the first work rotor 25 and the outer edge 260 of the rotation space formed by the rotation of the second work rotor 26. The lowermost end is set to substantially the same plane 270. By setting it as such a structure, the tilling depth of the 1st tilling claw 25b and the 2nd tilling claw 26b can be arrange | equalized, and the difference of the rotation load by the difference in tilling depth can be eliminated.

  Furthermore, in the agricultural machine 100 according to the present embodiment, the first tilling claw 25b disposed on the first working rotor 25 and the second tilling claw 26b disposed on the second working rotor 26 are shaped according to their roles. As a result, work efficiency is improved.

  FIG. 6 is a view showing the configuration of the first tilling claw 25 b used for the first work rotor 25. FIGS. 6A, 6B, and 6C correspond to a perspective view, a top view, and a side view of the first tillage claw 25b, respectively.

  As shown in FIG. 6, the first tillage claw 25 b has a structure in which a substantially rectangular plate-like member is bent at a bent portion 251. Therefore, the first tilling claw 25b is roughly divided into an attachment base 252a and a blade 252b. The attachment base 252a is provided with two through holes 253a and 253b for mounting the first tilling claw 25b to the first claw shaft 25a. Further, the thickness of the blade portion 252b near the tip becomes thinner as it approaches the blade edge portion 254.

  Since the 1st tilling nail | claw 25b has the shape shown by FIG. 6, the cutting of the blade part 252b with respect to a farm field is easy. Moreover, since the 1st tilling nail | claw 25b receives the resistance of soil in the surface of the blade part 252b, it can generate | occur | produce the big driving force for rotating the 1st nail | claw axis | shaft 25a. In other words, the first tilling claw 25b is designed to have a shape that easily receives the resistance of the soil in the field and easily rotates the first claw shaft 25a when the traveling machine body travels.

  FIG. 7 is a diagram illustrating a configuration of the second tilling claw 26 b used for the second work rotor 26. FIGS. 7A, 7B, and 7C correspond to a perspective view, a top view, and a side view of the second tillage claw 26b, respectively.

  As shown in FIG. 7, the second tillage claw 26b has a structure having a curved portion 261 in which a part of the plate-like member is gently curved. The second tillage claw 26b is roughly divided into an attachment base 262a and a blade 262b. The attachment base 262a is provided with two through holes 263a and 263b for mounting the second tillage claw 26b on the second claw shaft 26a. Further, the lower end portion of the blade portion 262b is processed so that the plate thickness gradually decreases as the blade edge portion 264 is approached.

  As shown in FIG. 7, the second tillage claw 26 b has a shape suitable for tilling the soil in the field. That is, with the rotation of the second claw shaft 26a, the blade portion 262b cuts into the soil, and the curved portion 261 can dissipate the soil. Thereby, the 2nd work rotor 26 can perform the cultivation work of a farm field efficiently. In particular, in the present embodiment, since the second work rotor 26 rotates at a speed twice or more that of the first work rotor 25, a work work with high work efficiency can be performed in combination with this.

  The present invention has been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Mounting part, 11 ... Top mast, 12a, 12b ... Lower link, 13a, 13b ... Support member, 14a, 14b ... Connection member, 20 ... Tillage working part, 21 ... 1st support frame, 22 ... 2nd support frame , 23a, 23b ... side plate, 24 ... shield cover, 25 ... first work rotor, 25a ... first claw shaft, 25b ... first tillage claw, 26 ... second work rotor, 26a ... second claw shaft, 26b ... 2nd tillage nail, 27 ... subsoiler, 28 ... fixing member, 29a, 29b ... regulating member, 30 ... pressure reducing operation part, 31 ... first basket roller, 31a ... support member, 31b ... flat bar, 32 ... second basket roller, 32a ... support member, 32b ... flat bar, 33a, 33b ... first support arm, 34a, 34b ... second support arm, 40 ... speed change mechanism, 40a ... first sprocket, 4 b ... 2nd sprocket, 40c ... roller chain, 41 ... cover member, 100 ... agricultural machine, 250, 260 ... outer edge of rotating space, 251 ... bent portion, 252a ... mounting base, 252b ... blade, 253a, 253b ... penetrating Hole, 254 ... Blade edge, 261 ... Bending part, 262a ... Mounting base, 262b ... Blade part, 263a, 263b ... Through hole, 264 ... Blade edge part, 270 ... Plane

Claims (7)

A farm working machine that is attached to the rear part of a traveling machine body and that is pulled by the traveling machine body to plow a farm field,
A plurality of first tilling claws are arranged with respect to the first claw shaft, and a first working rotor that rotates around the first claw shaft as a rotation axis as the traveling machine body travels;
A plurality of second tilling claws arranged with respect to the second claw axis, and a second work rotor that rotates around the second claw axis as a rotation axis in accordance with the rotation of the first work rotor;
A speed change mechanism that transmits the rotation of the first working rotor to the second working rotor at an increased speed;
With
The rotational diameter of the second working rotor is smaller than the rotational diameter of the first working rotor,
The farm work machine, wherein the number of the second tilling claws arranged around the axis of the second claw axis is equal to or more than the number of the first tilling claws arranged around the axis of the first claw axis.   2. The agricultural working machine according to claim 1, wherein the rotation speed of the second work rotor is not less than 2 times and not more than 4 times the rotation speed of the first work rotor.   3. The rotation space formed by the rotation of the first work rotor and the rotation space formed by the rotation of the second work rotor have respective lowermost ends located in substantially the same plane. Agricultural machine.   The agricultural machine according to any one of claims 1 to 3, wherein the speed change mechanism includes a roller chain and a plurality of sprockets.   The agricultural machine according to any one of claims 1 to 3, wherein the speed change mechanism includes a plurality of spur gears.   The agricultural working machine according to any one of claims 1 to 5, wherein a shape of the first tillage claw is different from a shape of the second tillage claw.   The farm working machine according to claim 6, wherein the second tillage claw has a blade portion that continuously extends from an attachment base portion attached to the second claw shaft and curves in one direction.

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