Agricultural machinery

Abstract

To provide agricultural machinery that can reduce the burden on workers. [Solution] The agricultural machine is equipped with a central tilling body 12 that performs tilling work while rotating. This central tilling body 12 has a tilling shaft 26, a plurality of tilling tines 27, and a plurality of bolts 61 and nuts 62. With respect to all of the plurality of bolts 61, the tightening direction b of each bolt 61 is in the opposite direction to the tilling shaft rotation direction a of the tilling shaft 26.

Description

Technical Field

[0001] Embodiments of the present invention relate to agricultural working machines.

Background Art

[0002] Conventionally, for example, an agricultural working machine described in Patent Document 1 below is known.

[0003] This conventional agricultural working machine (rotary tilling device) includes tilling bodies for performing tilling work. These tilling bodies have a tilling shaft extending in the left - right direction, a plurality of tilling claws (R tilling claws, L tilling claws) attached to the tilling shaft, and a plurality of screwing members (bolts, etc.) for attaching these tilling claws to the tilling shaft.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above - mentioned conventional agricultural working machine, during work in the field, for example, when a tilling claw rotates in a direction opposite to the tilling shaft rotation direction due to the reaction caused by contact with the field surface, the screwing member rotates in the loosening direction together with the tilling claw. As a result, loosening of the screwing member occurs. Even with a slight initial loosening, the claw pressing force by the screwing member decreases, so there is a risk that the loosening will increase due to vibrations during work in the field.

[0006] Therefore, the operator has to check the presence or absence of loosening of the screwing member relatively frequently. In addition, when loosening is discovered, it is necessary to tighten the loosened screwing member again, so the burden on the operator is large.

[0007] Therefore, one of the objectives of the embodiments of the present invention is to provide an agricultural machine that can reduce the burden on workers. [Means for solving the problem]

[0008] An embodiment of the present invention provides an agricultural implement comprising a tilling body for tilling work and a leveling body for leveling work behind the tilling body, wherein the tilling body has a tilling shaft that rotates in the direction of tilling shaft rotation, a plurality of tilling tines attached to the tilling shaft and performing tilling work while rotating in the direction of tilling shaft rotation, and a plurality of screw members for attaching the tilling tines to the tilling shaft, wherein the tightening direction of the screw members is opposite to the direction of tilling shaft rotation.

[0009] Furthermore, an agricultural implement according to an embodiment of the present invention comprises a tilling body for tilling work and a leveling body for leveling work behind the tilling body, wherein the tilling body has a tilling shaft that rotates in the direction of tilling shaft rotation, a plurality of tilling tines attached to the tine mounting portion of the tilling shaft and performing tilling work while rotating in the direction of tilling shaft rotation, and a plurality of screw members for attaching the tilling tines to the tine mounting portion, wherein the tightening direction of the screw members is opposite to the direction of tilling shaft rotation, and when the tilling tines rotate in the opposite direction to the direction of tilling shaft rotation relative to the tine mounting portion due to the recoil caused by contact with the field surface, the screw members rotate in the tightening direction together with the tilling tines. [Effects of the Invention]

[0010] According to embodiments of the present invention, the burden on workers can be reduced. [Brief explanation of the drawing]

[0011] [Figure 1] This is a side view of an agricultural implement (with the extension work section in the extended working state) according to one embodiment of the present invention. [Figure 2] This is a side view of the same agricultural implement (with the extension work section folded and in a non-working state). [Figure 3] This is a plan view of the same agricultural implement (with the extension working section extended). [Figure 4] This is a schematic perspective view of a portion of the same agricultural machine. [Figure 5] This diagram shows the right claw holder of the same agricultural machine, where (a) is a side view of one side, (b) is a rear view, and (c) is a side view of the other side. [Figure 6] This diagram shows the left claw holder of the same agricultural implement, where (a) is a side view of one side, (b) is a rear view, and (c) is a side view of the other side. [Figure 7] The diagram shows the right claw attached to the right claw holder, where (a) is a side view, (b) is an enlarged cross-sectional view of AA in (a), and (c) is an enlarged partial view of the view from arrow B in (b). [Figure 8] The above diagram shows the operation of the right claw, with (a) being a side view and (b) being an enlarged view of the bolt section. [Figure 9] The diagram shows the left claw attached to the left claw holder, where (a) is a side view, (b) is an enlarged cross-sectional view of CC in (a), and (c) is an enlarged partial view of the view taken along arrow D in (b). [Figure 10] The above diagram shows the operation of the left claw, with (a) being a side view and (b) being an enlarged cross-sectional view of the bolt section. [Figure 11] This is a schematic rear view of the central working section of the same agricultural machine. [Figure 12] This is a schematic rear view of the central working section of the same agricultural machine. [Figure 13] This is a partial schematic perspective view of an agricultural machine according to another embodiment of the present invention. [Modes for carrying out the invention]

[0012] One embodiment of the present invention will be described with reference to Figures 1 to 12.

[0013] In FIGS. 1 to 3, reference numeral 1 denotes an agricultural working machine. This agricultural working machine 1 is connected to the rear part of a tractor (not shown), which is a traveling vehicle capable of traveling in a field, and moves forward (in the traveling direction) in the field by the traveling of the tractor, and is a harrow that can selectively perform predetermined operations, that is, for example, tilling and soil pulling operations (cultivation operations).

[0014] As shown in FIGS. 1 to 3, the agricultural working machine 1 is, for example, a folding working machine having a foldable three-part structure, and is detachably connected to a three-point link part at the rear part of the tractor. It includes a central working part 2 that is a working part for performing predetermined operations (cultivation operations and soil pulling operations), and left and right extension working parts (side working parts) 3 that are respectively provided so as to be rotatable in the vertical direction about a rotation center axis (rotation fulcrum) 5 at both left and right ends in the lateral direction of the central working part 2, and perform predetermined operations (cultivation operations and soil pulling operations), and left and right rotation drive parts 4 for rotating the extension working parts 3 in the vertical direction about the rotation center axis 5 with respect to the central working part 2.

[0015] Each rotation drive part 4 has, for example, a cylinder (an electric hydraulic cylinder, a hydraulic cylinder, etc.) 7 that is a drive body capable of expansion and contraction. This cylinder 7 is appropriately controlled by a control part 8 based on a remote control operation by an operator or the like.

[0016] Each of the left and right extension working parts (the left working part and the right working part that form a pair symmetric with each other) 3 is in an expanded working state by rotation in one direction (substantially 180-degree rotation in the deployment direction) based on the extension operation of the cylinder 7, and is in a folded non-working state by rotation in the other direction (substantially 180-degree rotation in the folding direction) based on the contraction operation of the cylinder 7. That is, each extension working part 3 is selectively switched between an expanded working state and a folded non-working state by rotation based on the expansion and contraction operation of the cylinder 7 of the rotation drive part 4.

[0017] Therefore, the agricultural implement 1 can be selectively switched (set) between a state in which a predetermined task is performed using only the central work section 2 (folded state), a state in which a predetermined task is performed using both the central work section 2 and the left and right extension work sections 3 (unfolded state), and a state in which a predetermined task is performed using both the central work section 2 and either the left or right extension work section 3 (folded state).

[0018] The deployed state of the agricultural implement 1 is the state in which the left and right extension work sections 3 are switched to the deployed working state (the working state in which the extension work sections 3 are located to the sides of the central working section 2). The folded state of the agricultural implement 1 is the state in which at least one of the left and right extension work sections 3 is switched to the folded non-working state (the stored state in which the extension work section 3 is located above the central working section 2).

[0019] The central working unit 2 comprises a central machine body 11, which is a machine body detachably connected to the three-point linkage at the rear of the tractor; a central tilling body 12, which is a tilling body rotatably mounted on the central machine body 11 and performs tilling work while rotating in a predetermined direction (down-cut direction); and a central leveling body 13, which is a leveling body rotatably mounted in the vertical direction at the rear end of the tilling cover portion 25 of the central machine body 11 and performs leveling work behind the central tilling body 12.

[0020] The central leveling body (leveling body) 13 performs leveling work when in leveling work mode (leveling free mode), but performs soil removal work when switched to soil removal mode (soil removal locked mode) by the switching unit 57.

[0021] The central unit 11 has a three-point connecting section 15 that is detachably connected (attached) to the three-point link section (agricultural implement lifting support section) at the rear of the tractor.

[0022] The three-point connecting section 15 can be connected to the three-point link section, for example, via a quick coupler (auto hitch) pre-installed on the three-point link section. It consists of a top mast 17 having a top pin 16 that engages with the upper hook of the quick coupler, and left and right lower arms 19 having lower pins 18 that engage with the lower hooks of the quick coupler.

[0023] Furthermore, the central unit 11 has a transmission case section 22, which is an input shaft holding section that rotatably holds the input shaft 21, which is connected to the PTO shaft at the rear of the tractor via a joint.

[0024] The inner ends of frame pipe sections 23, which are cylindrical frame sections that are longitudinal in the left-right direction, are attached to both the left and right sides of the transmission case section 22. A chain case section 24, which is a roughly box-shaped transmission case, is attached to the outer end (left end) of the frame pipe section 23 on the left side (left side in the direction of travel). A roughly plate-shaped bracket section 20 is attached to the outer end (right end) of the frame pipe section 23 on the other side (right side in the direction of travel).

[0025] The central cultivator 12 is rotatably supported by the chain case section 24 and bracket section 20, which are left and right support sections that are spaced apart from each other.

[0026] The central tilling body 12 has a tilling shaft 26 which is a horizontally longitudinal rotating shaft that rotates in a predetermined direction, i.e., the tilling shaft rotation direction a which is the down-cut direction, based on power from the input shaft 21 side, and a plurality of tilling tines 27 are detachably attached to this tilling shaft 26.

[0027] The upper part of the central tilling body 12 is covered by a plate-shaped tilling cover 25 of the central machine body 11. Furthermore, power transmission clutch members (one-sided clutches) 28 are provided at both left and right ends (left and right outer ends) of the tilling shaft 26 of the central tilling body 12.

[0028] The central leveling body 13 has a roughly plate-shaped first leveling member (leveling plate) 31 that is rotatable in the vertical direction at the rear end of the tilling cover portion 25 of the central machine body 11, and a roughly plate-shaped second leveling member (rake) 32 is rotatable in the vertical direction at the lower end of the first leveling member 31.

[0029] The extension work unit 3 comprises an extension unit 41, which is a unit provided at both left and right ends of the central unit 11 so as to be rotatable in the vertical direction around a pivot axis 5; an extension tiller 42, which is rotatably provided on the extension unit 41 and performs tilling work while rotating in a predetermined direction (down-cut direction) together with the central tiller 12 when the extension work unit 3 is deployed; and an extension leveling unit 43, which is provided at the rear end of the tilling cover portion 45 of the extension unit 41 so as to be rotatable in the vertical direction and performs leveling work behind the extension tiller 42 together with the central leveling unit 13 when the extension work unit 3 is deployed.

[0030] Furthermore, the extended leveling body (leveling body) 43, like the central leveling body 13 described above, performs leveling work when in leveling work mode (leveling free mode), but performs soil removal work when switched to soil removal mode (soil removal locked mode) by the switching unit 57.

[0031] The extended tilling body 42 has a tilling shaft 46 which is a longitudinally oriented rotating shaft in the left-right direction that rotates in a predetermined direction, i.e., the tilling shaft rotation direction a which is the down-cut direction, based on power from the central tilling body 12 side, and a plurality of tilling tines 47 are detachably attached to this tilling shaft 46.

[0032] Furthermore, when the extension work unit 3 is in the deployed state, the upper part of the extended tilling body 42 of the extended work unit 3 in this deployed state is covered by the tilling cover 45 of the extension machine body 41. In addition, the inner ends of the tilling shafts 46 of each of the left and right extension tilling bodies 42 are provided with power transmission clutch members (the clutch on the other side) 48 that engage detachably with the clutch member 28 of the central tilling body 12.

[0033] The extended leveling body 43 has a roughly plate-shaped first leveling member (leveling plate) 51 that is rotatably mounted vertically at the rear end of the tilling cover portion 45 of the extended machine body 41, and a second leveling member (rake) 52 is rotatably mounted vertically at the lower end of the first leveling member 51.

[0034] Furthermore, an extension rake 53 is provided at the outer end of the second leveling member 52, and this extension rake 53 can be selectively switched between an extended working state and a folded non-working state by an extension rake switching unit (opening / closing unit) 55.

[0035] In Figure 3, 56 is a leveling body biasing unit (pressure unit) for biasing the leveling bodies 13 and 43 downwards during puddling work. Also, 57 in Figure 3 is a switching unit (earth pulling unit) for selectively switching the leveling bodies 13 and 43 between a leveling work state (a state in which they can rotate vertically relative to the machine) and an earth pulling work state (a state in which they cannot rotate vertically relative to the machine).

[0036] Here, the configuration of the central tilling body 12 of the central working section 2 will be explained in detail with reference to Figures 4 to 12. Note that the configuration of the extended tilling body 42 of the extended working section 3 is basically the same as the configuration of the central tilling body 12.

[0037] As shown in Figure 4, the central tilling body 12 has a tilling shaft 26 that is elongated in the left-right direction and rotates in a predetermined rotation direction, the tilling shaft rotation direction (down-cut direction) a; a plurality of tilling tines 27 that are detachably attached to the tilling shaft 26 and perform tilling work while rotating together with the tilling shaft 26 in the tilling shaft rotation direction a; and a plurality of bolts (screwed members) 61 and nuts (screwed receiving members) 62 for detachably attaching these plurality of tilling tines 27 to the tilling shaft 26.

[0038] Furthermore, in this central tilling unit 12, as shown in Figure 4, when the tilling tines 27 are attached to the tilling shaft 26 (tine attachment state), the tightening direction (tightening rotation direction) b of all of the bolts 61, which are multiple screw members for attaching the tines, is in the opposite direction (reverse direction) to the tilling shaft rotation direction a of the tilling shaft 26.

[0039] In the illustrated example, the bolt 61 is, for example, a hexagonal bolt, and the nut 62 that screws onto the bolt 61 is, for example, a hexagonal nut, and the mounting means 60 is composed of these bolt 61 and nut 62.

[0040] As shown in Figures 4, 7, 9, and 11, the tilling shaft (tine shaft) 26 has a horizontal, elongated, cylindrical shaft body 63 that is rotatably supported by left and right chain case portions 24 and bracket portions 20 that are spaced apart from each other, and a plurality of tine mounting portions 64 that protrude from the outer circumferential surface of the shaft body portion 63 and are positioned at intervals in the axial direction of the tilling shaft 26.

[0041] Each of the multiple tine mounting sections 64 is composed of, for example, two tine mounting sections, namely a right tine holder 64a and a left tine holder 64b. In other words, each tine mounting section 64, which protrudes from multiple different locations in the axial direction on the outer circumferential surface of the shaft body 63, is composed of a pair of tine holders (tine mounting sections) 64a and 64b that are positioned at approximately 180-degree intervals in the circumferential direction (including the approximate circumferential direction) of the tilling shaft 26.

[0042] As shown in Figure 5, the right claw holder 64a is formed in a substantially flat cylindrical shape with a claw insertion space 71 on the inside, and has an arc-shaped mounting portion 72, which is fixedly attached to the outer circumferential surface of the shaft body portion 63 by welding or the like.

[0043] Furthermore, the right claw holder 64a has a pair of left and right opposing plate portions 73 and 74 that are spaced apart from each other via a claw insertion space 71. A hexagonal hole 75 is formed in the left opposing plate portion 73, and a circular hole 76 is formed in the right opposing plate portion 74 so as to face the hexagonal hole 75. The left opposing plate portion 73 has a bent portion 77 that is bent at a right angle toward the right, and the tip surface of this bent portion 77 is fixed to the right opposing plate portion 74.

[0044] As shown in Figure 6, the left claw holder 64b is formed in a substantially flat cylindrical shape with a claw insertion space 81 on the inside, and has an arc-shaped mounting portion 82, which is fixedly attached to the outer circumferential surface of the shaft body portion 63 by welding or the like.

[0045] Furthermore, the left claw holder 64b has a pair of opposing plate portions 83 and 84 that are spaced apart from each other via a claw insertion space 81. A circular hole 85 is formed in the left opposing plate portion 83, and a hexagonal hole 86 is formed in the right opposing plate portion 84 so as to face the circular hole 85. The left opposing plate portion 83 has a bent portion 87 that is bent at a right angle toward the right, and the tip surface of this bent portion 87 is fixed to the right opposing plate portion 84.

[0046] Furthermore, the right tine holder 64a and the left tine holder 64b have the positions of the hexagonal holes 75 and 86 and the circular holes 76 and 85 reversed on the left and right sides, which allows for identification of the cultivator tines 27 to be attached.

[0047] As shown in Figures 4, 7, 9, and 11, the multiple tilling tines (puddling tines) 27 consist of multiple right tilling tine members, 91, which are curved plate-shaped members whose tips are bent to the right when viewed from behind (rear view), and multiple left tilling tine members, 92, which are curved plate-shaped members whose tips are bent to the left when viewed from behind (rear view). In other words, the central tilling body 12 has two types of right tines 91 and left tines 92 as multiple tilling tines 27, with different curving directions.

[0048] The right claw (R claw) 91 has a mounting base 101 which is detachably attached to the right claw holder 64a by bolts 61 and nuts 62 which are screwed together, a vertical blade portion 102 which is connected to the tip end of the mounting base 101, and a horizontal blade portion 103 which is connected to the tip end of the vertical blade portion 102.

[0049] In other words, the right claw 91 has a lateral blade portion (curved plate portion) 103 at its tip end, which is curved toward the right when viewed from behind, and a mounting base portion (insertion plate portion) 101 at its base end, which is inserted into the claw insertion space 71 of the right claw holder 64a and is detachably attached to the right claw holder 64a.

[0050] Furthermore, the mounting base 101 has a circular hole 104 that matches the circular hole 76 of the right claw holder 64a. The blade edges of the vertical blade portion 102 and the horizontal blade portion 103 have inclined blade surfaces 105 that are sharpened to cut into the soil of the field.

[0051] The left claw (L claw) 92 has a mounting base 106 which is detachably attached to the left claw holder 64b by bolts 61 and nuts 62 which are screwed together, a vertical blade portion 107 which is connected to the tip end of the mounting base 106, and a horizontal blade portion 108 which is connected to the tip end of the vertical blade portion 107.

[0052] In other words, the left claw 92 has a lateral blade portion (curved plate portion) 108 at its tip end, which is curved toward the left when viewed from behind, and a mounting base portion (insertion plate portion) 106 at its base end, which is inserted into the claw insertion space 81 of the left claw holder 64b and is detachably attached to the left claw holder 64b.

[0053] Furthermore, the mounting base 106 has a circular hole 109 that matches the circular hole 85 of the left claw holder 64b. The blade edges of the vertical blade portion 107 and the horizontal blade portion 108 have inclined blade surfaces 110 that are sharpened to cut into the soil of the field.

[0054] As shown in Figures 4, 7, 9, and 11, the multiple bolts (threaded members) 61 consist of multiple right-handed male threaded members, which are right-hand threads (right-hand threaded bolts) 111, arranged so that their tip surfaces 111a face to the right when viewed from the rear (rear view), and multiple left-handed male threaded members, which are left-hand threads (left-hand threaded bolts) 112, arranged so that their tip surfaces 112a face to the left when viewed from the rear (rear view). In other words, the central tilling body 12 has two types of right-hand threads 111 and left-hand threads 112 as multiple bolts 61, with thread directions different from each other.

[0055] A right-hand screw (a common type of screw) 111 is tightened by rotating clockwise and loosened by rotating counterclockwise. The right-hand screw 111 has a round shaft portion 116 with a helical thread groove 115 formed on its outer surface, and a hexagonal screw head 117 provided at the base end of the shaft portion 116.

[0056] A left-hand thread (reverse thread) 112 is tightened by rotating counterclockwise and loosened by rotating clockwise. The left-hand thread 112 has a round shaft portion 121 with a helical thread groove 120 formed on its outer surface, and a hexagonal thread head 122 provided at the base end of the shaft portion 121.

[0057] Here, as shown in Figures 7(a) to (c), the right tine 91, which is the tilling tine 27 of the central tilling body 12, is detachably attached to the right tine holder 64a using a right screw 111 and a nut 62 (using a set of bolt and nut).

[0058] More specifically, a right-hand thread (a right-hand threaded bolt, or right-hand male threaded member) 111, in which the screw shaft portion 116 is inserted into the circular holes 76 and 104 and the screw head 117 is inserted into the hexagonal hole 75, is fixed to the right claw 91 by screwing a nut (a right-hand threaded nut, or right-hand female threaded member) 62 onto the tip of the screw shaft portion 116, thereby pressing the mounting base portion 101 of the right claw 91 against the opposing plate portion 74 on the right side.

[0059] In this state, the screw head 117 is pressed against the portion of the mounting base 101 of the right claw 91 located around the circular hole 104, and the nut 62 is pressed against the portion of the opposing plate 74 on the right side of the right claw holder 64a located around the circular hole 76.

[0060] Furthermore, in this state, as shown in Figure 7(b), a gap (for example, a space of dimension S1) 123 exists between the mounting base 101 of the right claw 91 and the bent portion 77 of the right claw holder 64a to facilitate the insertion of the mounting base 101 into the claw insertion space 71. Similarly, a gap 123 also exists on the upper part of the mounting base 101.

[0061] Furthermore, in this state, as shown in Figure 7(c), a gap (for example, a space of dimension S2) 124 exists between the outer surface of the screw head 117 of the right-hand screw 111 and the surface surrounding the hexagonal hole 75 of the right-hand claw holder 64a, which facilitates the insertion of the screw head 117 into the hexagonal hole 75.

[0062] Then, as shown in Figures 8(a) and (b), during puddling work in the field, if the right claw 91 of the tilling claw 27 of the central tilling body 12 rotates slightly relative to the right claw holder 64a in the opposite direction to the tilling axis rotation direction a due to the recoil from contact with the field surface (e.g., paddy field surface T) based on the gap 123, the right screw 111 rotates in the tightening direction b along with the right claw 91.

[0063] In other words, as the right-hand screw 111 rotates together with the right claw 91 of the central tilling body 12, the screw head 117 of the right-hand screw 111 rotates in the tightening direction b within the range of the gap 124 in the hexagonal hole 75, and as a result, the right-hand screw 111 is tightened onto the nut 62. The same applies to the extension tilling body 42; although not shown in the diagram, as the right-hand screw rotates together with the right claw of the extension tilling body 42, the screw head of the right-hand screw rotates in the tightening direction within the hexagonal hole, and as a result, the right-hand screw is tightened onto the nut.

[0064] On the other hand, as shown in Figures 9(a) to (c), the left tine 92, which is the tilling tine 27 of the central tilling body 12, is detachably attached to the left tine holder 64b using a left-hand screw 112 and a nut 62 (using a set of bolt and nut).

[0065] More specifically, the left-hand thread (a left-hand threaded bolt, a left-handed male threaded member) 112, in which the screw shaft portion 121 is inserted into the circular holes 85 and 109 and the screw head 122 is inserted into the hexagonal hole 86, is fixed to the left claw 92 by screwing a nut (a left-hand threaded nut, a left-handed female threaded member) 62 onto the tip of the screw shaft portion 121, thereby pressing the mounting base portion 106 of the left claw 92 against the left opposing plate portion 83.

[0066] In this state, the screw head 122 is pressed against the portion of the mounting base 106 of the left claw 92 located around the circular hole 109, and the nut 62 is pressed against the portion of the left opposing plate portion 83 of the left claw holder 64b located around the circular hole 85.

[0067] Furthermore, in this state, as shown in Figure 9(b), a gap (for example, a space of dimension S3) 125 exists between the mounting base 106 of the left claw 92 and the bent portion 87 of the left claw holder 64b to facilitate the insertion of the mounting base 106 into the claw insertion space 81. Similarly, a gap 125 also exists on the upper part of the mounting base 106.

[0068] Furthermore, in this state, as shown in Figure 9(c), a gap (for example, a space of dimension S4) 126 exists between the outer surface of the screw head 122 of the left-hand screw 112 and the surface surrounding the hexagonal hole 86 of the left-hand claw holder 64b, which facilitates the insertion of the screw head 122 into the hexagonal hole 86.

[0069] Then, as shown in Figures 10(a) and (b), during puddling work in the field, if the left claw 92, which is a tilling claw 27 of the central tilling body 12, rotates slightly relative to the left claw holder 64b in the direction opposite to the tilling axis rotation direction a due to the recoil from contact with the field surface (e.g., paddy field surface T), the left screw 112 rotates in the tightening direction b along with the left claw 92.

[0070] In other words, as the left-hand thread 112 rotates together with the left claw 92 of the central tilling body 12, the thread head 122 of the left-hand thread 112 rotates in the tightening direction b within the gap 126 of the hexagonal hole 86, and as a result, the left-hand thread 112 is tightened onto the nut 62. The same applies to the extension tilling body 42; although not shown in the diagram, as the left-hand thread rotates together with the left claw of the extension tilling body 42, the thread head of the left-hand thread rotates in the tightening direction within the hexagonal hole, and as a result, the left-hand thread is tightened onto the nut.

[0071] Furthermore, Figures 11 and 12 are schematic rear views of the central working section 2 of the agricultural implement 1.

[0072] Furthermore, as shown in Figure 11, if the distance A1 between the nut 62 near the left end of the tilling shaft 26 and the chain case portion 24 is shorter than a predetermined distance (the distance at which an impact driver can be inserted; the same applies hereafter), and the distance B1 between the nut 62 near the right end of the tilling shaft 26 and the bracket portion 20 is shorter than a predetermined distance, then an impact driver (a power tool for tightening screws) cannot be used on the nuts 62 near both ends.

[0073] Therefore, in such cases, it is preferable to orient the nuts 62 near both ends inward, as shown in Figure 12, so that an impact driver can be used on all the nuts 62 in the central cultivator 12.

[0074] In other words, in the central tilling unit 12 shown in Figure 12, as an exception, the left tine 92 is attached to the right tine holder 64a by a right screw 111 and nut 62 near the left end of the tilling shaft 26, and the right tine 91 is attached to the left tine holder 64b by a left screw 112 and nut 62 near the right end of the tilling shaft 26. Although not shown, the same applies to the extension tilling unit 42, and it is preferable that an impact driver be able to be used for all the nuts 62 on the extension tilling unit 42.

[0075] Next, we will explain the operation of agricultural machine 1.

[0076] For example, as shown in Figure 3, when the agricultural implement 1, in its deployed state with the left and right extension work sections 3 locked in the deployed working position, moves in the working position in the field towards the front, which is the direction of travel, as the tractor moves, the tilling tines 27 and 47 of the tilling bodies 12 and 42 rotate in the tilling axis rotation direction a, performing tilling work, while the leveling bodies 13 and 43 perform leveling work behind them. In this way, tilling and leveling work (puddling work) is performed in the field by the agricultural implement 1 in its working position.

[0077] Furthermore, during such work, if the tilling tines 27 and 47 rotate in the opposite direction to the tilling shaft rotation direction a relative to the tine mounting portion 64 due to the recoil caused by contact with the field surface, the bolt 61 rotates in the tightening direction b along with the tilling tines 27 and 47.

[0078] In other words, in this agricultural implement 1, for example, all of the bolts (male threaded members) 61 to which the tilling tines 27, 47 are attached to the tilling shafts 26, 46 have a tightening direction b opposite to the tilling shaft rotation direction a. Therefore, even if the tilling tines 27, 47 rotate in the opposite direction to the tilling shaft rotation direction a due to contact with the field surface during work in the field, the bolts 61 will not rotate in the loosening direction.

[0079] Therefore, with such an agricultural implement 1, even if all bolts 61 (right-hand thread 111, left-hand thread 112) rotate together with the tilling tines 27, 47, the bolts 61 rotate in the tightening direction rather than the loosening direction. This rotation in the tightening direction increases the tine-holding force (fastening force) of the bolts 61, and thus effectively suppresses the loosening of the bolts 61 during work in the field, thereby reducing the burden on the worker.

[0080] In the above embodiment, the case in which multiple bolts 61 are composed of right-hand threads (right-hand male thread members) 111 and left-hand threads (left-hand male thread members) 112 was described, but the invention is not limited to this, and for example, as shown in Figure 13, multiple bolts 61 may be composed of only right-hand threads (right-hand male thread members) 111.

[0081] In the configuration shown in Figure 13, unlike the one shown in Figure 4, the left claw 92 is attached to the right claw holder 64a by a right screw 111 and a nut 62, and a circular marking hole 131 is formed in the right claw holder 64a.

[0082] In other words, the right claw holder 64a to which the left claw 92 is attached has a small hole, a marking hole 131, formed in the left opposing plate portion 73 as a marker for the direction in which the claw bends.

[0083] Furthermore, as shown in Figure 13, the loosening of the bolt 61 during field work can be effectively suppressed, similar to the one shown in Figure 4 above, thereby reducing the burden on workers.

[0084] In addition, in the embodiment shown in Figure 13, an impact driver may be used for all nuts 62, for example, by using a left-hand claw holder 64b and a left-hand thread 112 near the right end of the tilling shaft 26. Furthermore, it is also possible to construct multiple bolts 61 using only left-hand threads (right-hand male thread members) 112.

[0085] Furthermore, the configuration may be such that the tightening direction of some bolts (threaded components), rather than all of them, is opposite to the rotation direction of the tilling shaft, such as at the central part of the machine, the left and right ends, or at positions corresponding to the tire tracks of a moving vehicle.

[0086] On the other hand, agricultural implements are not limited to folding implements with a three-part structure that can be folded (a configuration comprising a central work section and left and right extension work sections). For example, they may have a configuration comprising a work section connected to a vehicle and extension work sections provided at only one end of either the left or right end of the work section, or a single-piece configuration without extension work sections.

[0087] Furthermore, the leveling body (central leveling body, extended leveling body) that performs leveling work is not limited to having a first leveling member and a second leveling member; for example, it may have only a first leveling member, or the leveling body may be attached to the rear end of the tilling cover section (central tilling cover section, extended tilling cover section) via an elastic plate such as a rubber sheet.

[0088] Furthermore, it is not limited to puddling machines, but may also be used in the claws of rotary implements, levee builders, and grass cutters, for example. [Explanation of symbols]

[0089] 1 Agricultural machinery 12. The central tilling unit, which is the tilling unit. 13. Central leveling body, which is a leveling body 26,46 tillage axis 27,47 Cultivating Claw 42. Extended tillage unit, which is a tillage unit. 43. Extended leveling body, which is a leveling body. 61 Bolts, which are threaded components. 62. Nut, which is a screw-receiving member. 64 Claw mounting part 91 Right-hand tilling tine member, the right tine 92 Left tilling tine component, left tine 111 Right-hand threaded component 112 Left-hand threaded component a. Rotation direction of the tilling shaft b. Tightening direction (tightening rotation direction)

Claims

1. A tilling machine used for tilling work, The system comprises a leveling unit that performs leveling work behind the tilling unit, The aforementioned tilling body is A tilling shaft that rotates in the direction of rotation of the tilling shaft, Multiple tilling tines attached to the tilling shaft and performing tilling work while rotating in the direction of rotation of the tilling shaft, The tilling tines have a plurality of screw-type members for attaching them to the tilling shaft, The tightening direction of the screw-in member is opposite to the rotation direction of the tilling shaft. A farming machine characterized by the following features.

2. A tilling machine used for tilling work, The system comprises a leveling unit that performs leveling work behind the tilling unit, The aforementioned tilling body is A tilling shaft that rotates in the direction of rotation of the tilling shaft, Multiple tilling tines are attached to the tine mounting portion of the tilling shaft and perform tilling work while rotating in the direction of rotation of the tilling shaft, It has a plurality of screw-type members for attaching the tilling tines to the tine mounting portion, The tightening direction of the screw member is opposite to the rotation direction of the tilling shaft. When the tilling tine rotates in the opposite direction to the tilling shaft rotation direction relative to the tine mounting portion due to the recoil caused by contact with the field surface, the screw member rotates in the tightening direction together with the tilling tine. A farming machine characterized by the following features.

3. Multiple threaded members consist of right-hand threaded members and left-hand threaded members. The agricultural implement according to claim 1 or 2.

4. The right-handed male threaded member is positioned so that its tip faces to the right when viewed from the rear. The left-hand threaded component is positioned so that its tip faces left when viewed from the rear. The agricultural implement according to feature 3.

5. Multiple screw-type members consist only of right-hand threaded members. The agricultural implement according to claim 1 or 2.

6. Multiple tilling tines, A right-hand tilling tine member whose tip is curved to the right when viewed from the rear, It consists of a left-hand tilling tine member whose tip is curved to the left when viewed from the rear. The agricultural implement according to claim 1 or 2.

7. The threaded member is tightened to the threaded receiving member by rotating together with the tilling claw. The agricultural implement according to claim 1 or 2.

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