Agricultural working machine

Abstract

To provide an agricultural implement capable of reducing the load of a worker.SOLUTION: This agricultural implement 1 is equipped with a central operation part 2 connected to a tractor and an extended operation part 3 capable of being switched to a developed operation state and a folded non-operation state. The central operation part 2 has one and the other contact receiving parts 61,62. The extension working part 3 has one and the other contact parts 63,64. When the extended working part 3 is switched to the folded non-working state, the one abutting part 63 abuts on the one abutting receiving part 61, and the other abutting part 64 abuts on the other abutting receiving part 62.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an agricultural machine. [Background technology]

[0002] BACKGROUND ART Conventionally, an agricultural work machine such as that described in Patent Document 1 below is known.

[0003] This conventional agricultural work machine comprises a central working unit, which is a working unit that is connected to a traveling vehicle such as a tractor, and left and right extension working units that are rotatably mounted on this central working unit and can be switched between an unfolded working state and a folded non-working state.

[0004] The extension working unit has an extension cover, an extension apron, an extension leveler, a hanging arm, and a rod unit, and the central working unit has a receiving member that abuts against the rod unit to restrict downward movement of the rod unit when the extension working unit is switched to the folded non-working state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-147968 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the above-mentioned conventional agricultural work machine, when the extended working unit is switched to the folded non-working state, only the rod portion of the extended working unit abuts against the receiving member, which places a particularly large load on the receiving member, making it prone to problems such as deformation of the receiving member.

[0007] When such a problem occurs, the worker must replace the receiving member each time, which places a heavy burden on the worker.

[0008] Therefore, one of the objects of the embodiments of the present invention is to provide an agricultural work machine that can reduce the burden on the worker. [Means for solving the problem]

[0009] An agricultural work machine according to an embodiment of the present invention comprises a working unit connected to a traveling vehicle and an extended working unit that can be switched between an unfolded working state and a folded non-working state, the working unit having one abutment receiving portion and another abutment receiving portion, the extended working unit having one abutment portion and another abutment portion, and when the extended working unit is switched to the folded non-working state, the one abutment portion abuts against the one abutment receiving portion and the other abutment portion abuts against the other abutment receiving portion. [Effects of the Invention]

[0010] According to the embodiment of the present invention, it is possible to reduce the burden on the worker. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of an agricultural work machine according to one embodiment of the present invention (an agricultural work machine in an unfolded state with an extended working section in an unfolded working state). FIG. [Figure 2] FIG. 2 is a side view of the same agricultural work machine (in a folded state with the extended working section folded and in a non-working state). [Figure 3] FIG. 2 is a plan view of the same agricultural work machine (in an unfolded state with the extended work section in the unfolded working state). [Figure 4] FIG. [Figure 5] FIG. 5 is an exploded perspective view showing an enlarged portion of FIG. 4. [Figure 6] FIG. [Figure 7] 1 is a partial view of the agricultural work machine as viewed from the front side in the axial direction of the pivot shaft (when the extended working unit is in an extended working state). [Figure 8]1(a) is a partial view of the agricultural work machine as viewed from the axial front side of the pivot shaft (when the extension working part is folded and not in operation), and FIG. 1(b) is an enlarged cross-sectional view of a part of FIG. [Figure 9] FIG. 2 is an exploded perspective view showing a part of the central working unit of the agricultural work machine. [Figure 10] FIG. 1(a) is a diagram showing the contact receiver in a first state, and FIG. 1(b) is a diagram showing the contact receiver in a second state. [Figure 11] FIG. 4 is a schematic cross-sectional view showing the longitudinal dimension of the agricultural work machine when the contact receiving body is in a first state. [Figure 12] 10 is a schematic cross-sectional view showing the longitudinal dimension of the agricultural work machine when the contact receiving body is in a second state. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described with reference to FIGS.

[0013] In Figures 1 to 3, 1 is an agricultural work machine, and this agricultural work machine 1 is a harrow that is connected to the rear of a tractor (not shown), which is a vehicle that can travel on a field, and can selectively perform predetermined tasks, such as plowing (plowing) and soil removal, while moving forward (in the direction of travel) on the field as the tractor travels.

[0014] As shown in Figures 1 to 3, the agricultural work machine 1 is, for example, a folding work machine with a foldable three-part structure, and is equipped with a central work unit 2 that is detachably connected to a three-point link unit at the rear of the tractor and is a work unit that performs specified work (plowing and toppling), left and right extension work units (side work units) 3 that are respectively provided at both left and right ends of the central work unit 2 and are rotatable in the vertical direction around a rotation center axis (rotation fulcrum) 5 and perform the specified work (plowing and toppling), and left and right rotation drive units 4 for rotating the extension work units 3 in the vertical direction relative to the central work unit 2 around the rotation center axis 5.

[0015] Each rotation drive unit 4 has a cylinder 7 (such as an electric hydraulic cylinder or a hydraulic cylinder) which is an extendable drive body (drive means), and this cylinder 7 is appropriately controlled by a control unit 8 based on remote control operation by the operator.

[0016] Each of the left and right extension working units 3 (a left and right working unit that are a symmetrical pair) is placed in an unfolded working state by rotation in one direction (rotation of approximately 180 degrees in the unfolding direction) based on the extension operation of the cylinder 7, and is placed in a folded non-working state by rotation in the other direction (rotation of approximately 180 degrees in the folding direction) based on the contraction operation of the cylinder 7. In other words, each extension working unit 3 can be selectively switched between an unfolded working state and a folded non-working state by rotation based on the extension and contraction operation of the cylinder 7.

[0017] Therefore, the agricultural work machine 1 can be selectively switched (set) between a state in which a specified task is performed using only the central working unit 2, a state in which a specified task is performed using the central working unit 2 and both the left and right extension working units 3, and a state in which a specified task is performed using the central working unit 2 and either the left or right extension working unit 3.

[0018] The central working unit 2 comprises a central body 11, which is a machine body that is detachably connected to the three-point link at the rear of the tractor, a central tilling body 12, which is a tilling body that is rotatably mounted on the central body 11 and performs tilling work while rotating in a predetermined direction (down-cut direction), and a central leveling body 13, which is a ground leveling body that is rotatably mounted on the rear end of the tilling cover section 25 of the central body 11 in the vertical direction and performs ground leveling work behind the central tilling body 12. The central leveling body 13 performs ground leveling work in the ground leveling work state (ground leveling free state), but performs earth-pulling work when switched to the earth-pulling work state (earth-pulling locked state) by the switching unit 57.

[0019] The central body 11 has a three-point linkage 15 that is detachably connected (attached) to a three-point linkage (agricultural work machine lifting support section) at the rear of the tractor.

[0020] The three-point connection section 15 can be connected to the three-point link section, for example, via a quick coupler (auto hitch) that is pre-attached to the three-point link section, and is composed of a connecting mast (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.

[0021] The central machine body 11 has a transmission case portion 22 which is an input shaft holding portion that rotatably holds an input shaft 21 which is connected to the PTO shaft at the rear of the tractor via a joint.

[0022] The inner ends of frame pipes 23, which are cylindrical frames elongated in the left-right direction, are attached to both the left and right sides of the transmission case 22. A chain case 24, which is a roughly box-shaped support part, is attached to the outer end (left end) of the frame pipe 23 on one side, the left side. A bracket (not shown), which is a roughly plate-shaped support part, is attached to the outer end (right end) of the frame pipe 23 on the other side, the right side. The central tiller body 12 is rotatably supported by the chain case 24 and the bracket, which are spaced apart and facing each other.

[0023] The central cultivator body 12 has a cultivator shaft 26, which is a longitudinal rotating shaft extending left and right and rotates in a predetermined direction based on power from the input shaft 21 side, and a plurality of cultivator tines 27 are removably attached to this cultivator shaft 26.

[0024] The upper part of the central tillage body 12 is covered by a tillage cover part 25 of the central machine body 11. In addition, a clutch member (one-side clutch) 28 for power transmission is provided on both left and right ends (outer left and right ends) of the tillage shaft 26 of the central tillage body 12.

[0025] The central leveling body 13 has a first leveling member (leveling plate) 31, which is approximately plate-shaped and is rotatable in the vertical direction at the rear end of the tillage cover portion 25 of the central body 11, and a second leveling member (rake) 32, which is approximately plate-shaped and is rotatable in the vertical direction at the lower end of this first leveling member 31.

[0026] The extended working unit 3 comprises an extended body 41, which is a machine body mounted on both left and right ends of the central body 11 so as to be rotatable up and down about a rotation center axis 5; an extended tilling body 42, which is rotatably mounted on the extended body 41 and which performs tilling work while rotating in a predetermined direction (down-cutting direction) together with the central tilling body 12 when the extended working unit 3 is in the extended working state; and an extended soil leveling body 43, which is rotatably mounted on the rear end of the tilling cover part 45 of the extended body 41 so as to be rotatable up and down and which performs soil leveling work behind the extended soil leveling body 42 together with the central soil leveling body 13 when the extended working unit 3 is in the extended working state. Like the central soil leveling body 13, the extended soil leveling body 43 also performs soil leveling work in the soil leveling work state (soil leveling free state), but performs soil pulling work when switched to the soil pulling work state (soil pulling locked state) by the switching unit 57.

[0027] The extension cultivator body 42 has a cultivator shaft 46, which is a longitudinal rotating shaft extending from left to right and rotates in a predetermined direction based on power from the central cultivator body 12 side, and a plurality of cultivator tines 47 are removably attached to this cultivator shaft 46.

[0028] When in the extended working state, the upper part of the extended tillage body 42 is covered by the tillage cover part 45 of the extended machine body 41. The inner end of the tillage shaft 46 of each of the left and right extended tillage bodies 42 is provided with a power transmission clutch member (other-side clutch) 48 that can be disengaged with the clutch member 28 of the central tillage body 12.

[0029] The extended ground leveling body 43 has a first ground leveling member (leveling plate) 51 which is approximately plate-shaped and is rotatable in the vertical direction at the rear end of the tillage cover portion 45 of the extended body 41, and a second ground leveling member (rake) 52 is rotatable in the vertical direction at the lower end of this first ground leveling member 51.

[0030] An extension rake 53 is provided at the outer end of the second ground leveling member 52, and this extension rake 53 can be selectively switched by an extension rake switching section (opening / closing unit) 55 between an extended working state and a folded non-working state.

[0031] Furthermore, 56 in Fig. 3 is a ground leveling body biasing section (pressure unit) for biasing the ground leveling bodies 13, 43 downward during plowing work. Also, 57 in Fig. 3 is a switching section (earth-pulling unit) that can selectively switch the ground leveling bodies 13, 43 between a ground leveling work state (a state in which they can rotate vertically relative to the machine body) and an earth-pulling work state (a state in which they cannot rotate vertically relative to the machine body).

[0032] 4 to 12, the central working unit 2 has a plurality of abutment receiving portions arranged at different positions, i.e., two abutment receiving portions, one abutment receiving portion 61 and another abutment receiving portion 62, on both the left and right sides. Also, each of the extension working units 3 on the left and right sides has a plurality of abutment receiving portions arranged at different positions so as to correspond to the two abutment receiving portions 61, 62 on the central working unit 2 side, i.e., two abutment portions, one abutment portion 63 and another abutment portion 64, on both the left and right sides.

[0033] Then, when the extension working unit 3 rotates in the folding direction around the pivot axis 5 based on the contraction action of the cylinder 7 and is switched to a non-folding working state, one abutment portion 63 abuts one abutment receiving portion 61 in a planar manner, and at the same time, the other abutment portion 64 abuts the other abutment receiving portion 62 in an approximately linear manner (for example, it may be planar).

[0034] As a result, downward rotation of the extension working unit 3 is restricted by a plurality of locations, for example, by the two contact receiving portions 61, 62, and the extension working unit 3 is supported (maintained) in the desired folded non-working state. In other words, when the extension working units 3 on the left and right are both folded above the central working unit 2 and in the folded non-working state, they are supported in contact with at least two locations (or three or more locations) of the central working unit 2, and therefore their weight is distributed to a plurality of locations, and as a result, the load on the contact receiving portions 61, 62 and the contact portions 63, 64 is reduced.

[0035] First, we will explain one abutment receiving portion (first abutment receiving portion) 61 of the central working unit 2 and one abutment portion (first abutment portion) 63 of the extension working unit 3. The abutment portion 63 and the abutment receiving portion 61 that abut against each other constitute a first abutment means 66.

[0036] The first contact receiving portion 61 is configured as a part of a central holding body 71 which is a holding body that holds the central rotation shaft 5 that is the rotation center of the extension working unit 3, for example.

[0037] The central holding body 71 is fixed to the outer end of the frame pipe section 23 of the central body 11 of the central working section 2, and has a pair of opposing plate sections 72 that are spaced apart and facing each other, and the rotating center axis 5 is detachably installed between these opposing plate sections 72.

[0038] The opposing plate portions 72 are connected by a bent plate-like connecting plate portion 73, and this connecting plate portion 73 has a rectangular flat plate portion 74 located near the rotation center axis 5, and this flat plate portion 74 constitutes one of the contact receiving portions 61. A reinforcing plate 75 that reinforces the flat plate portion 74 is fixed to the underside of the flat plate portion 74.

[0039] The first contact portion 63 is configured, for example, by a part of an extension-side holder 81 which is a holder that holds the rotation center shaft 5 that is the rotation center of the extension working unit 3.

[0040] The extension side holding body 81 is fixed to the inner end of the tillage cover section 45 of the extension body 41 of the extension working section 3 and has a holding main body 82 that rotatably holds the rotation center axis 5, and a plate-shaped abutment member 83 that is detachably attached to this holding main body 82 and constitutes one abutment section 63.

[0041] The holding body 82 has a pair of opposing plate portions 85 that are spaced apart and face each other, and a cylindrical tubular portion 86 is fixed between these opposing plate portions 85, and the rotation center shaft 5 is rotatably inserted into this tubular portion 86. In other words, the tubular portion 86 of the extension side holding body 81 is rotatable with respect to the rotation center shaft 5 fixed to the center side holding body 71.

[0042] The opposing plate portions 85 are connected by a connecting plate portion 87 in the form of a bent plate, and the abutment member 83 is detachably attached to the upper surface of this connecting plate portion 87 by means of attachment means 88. The attachment means 88 is made up of, for example, a bolt 89 and a nut 90, and the nut (welded nut) 90 is fixed to the lower surface of the connecting plate portion 87. A reinforcing plate 91 that reinforces the connecting plate portion 87 is fixed to the lower surface of the connecting plate portion 87.

[0043] The bolts 89 are inserted into the bolt holes 93 and 94 and screwed onto the nuts 90, so that the contact member 83 is detachably attached to the upper surface of the connecting plate portion 87.

[0044] During attachment, the height of the abutment member 83 can be finely adjusted by sandwiching one or more thin spacers 95 between the abutment member 83 and the connecting plate portion 87. In other words, the height of the abutment member 83 can be adjusted relative to the upper surface of the connecting plate portion 87, which serves as the attachment surface. Note that the spacers 95 may have the same or different thicknesses, and are each formed with a notch (which may be a hole) 96 for a bolt.

[0045] The abutment member 83 is made of an elastic plate (e.g., a rubber plate) 98, which is a flat elastic body made of rubber or resin that is elastically deformable and has a core material 97, such as a metal core bar, inside, and a bolt hole portion 93 is formed through the part of this elastic plate 98 opposite the pivot center axis 5 (the outer part in the left-right direction when in the unfolding operation state).

[0046] When the extension working unit 3 is in the folded non-working state, the contact portion (contact member 83) 63 consisting of the elastic plate 98 comes into planar contact with the flat plate portion 74 of the corresponding (opposing) contact receiving portion 61 (see Figure 8(b)).

[0047] Next, we will explain the other contact receiving portion (second contact receiving portion) 62 of the central working unit 2 and the other contact portion (second contact portion) 64 of the extension working unit 3. The contact portion 64 and the contact receiving portion 62 that come into contact with each other constitute a second contact means 67.

[0048] The other contact receiving portion 62 has, for example, a plate-shaped base body 101 fixed to the tillage cover portion 25 of the central body 11 of the central working unit 2, a U-shaped support frame 102 detachably attached to this base body 101, and a contact receiving body 103 supported by this support frame 102 and selectively changeable (settable) between a first state and a second state.

[0049] Furthermore, the longitudinal length dimension L2 of the agricultural implement 1 when the contact receiving body 103 is in the second state (when the tubular contact receiving member 125 is facing downward) is shorter than the longitudinal length dimension L1 of the agricultural implement 1 when the contact receiving body 103 is in the first state (when the tubular contact receiving member 125 is facing upward) (see Figures 11 and 12).

[0050] Here, the support frame 102 is detachably attached to the upper surface of the base body 101 on the tillage cover portion 25 by attachment means 105. The attachment means 105 is, for example, composed of a bolt 106 and a nut 107, and the nut (welded nut) 107 is fixed to the underside of the tillage cover portion 25.

[0051] Bolts 106 are inserted into bolt holes 108 and 109 and screwed onto nuts 107, whereby support frame 102 is detachably attached to the top surface of base body 101.

[0052] During attachment, the height of the support frame 102 can be finely adjusted by sandwiching one plate-shaped reference spacer 111 or one or more thin plate-shaped additional spacers 112 (both spacers may be sandwiched) between the support frame 102 and the base body 101. In other words, the height of the support frame 102 (the contact receiving member 125 of the contact receiving body 103 supported thereby) can be adjusted relative to the upper surface of the base body 101, which serves as the attachment surface. The additional spacers 112 may have the same or different thicknesses, for example, and the spacers 112 have bolt notches (which may be holes) 113 formed therein, and the reference spacer 111 has bolt holes (which may be notches) 110 formed therein.

[0053] The support frame 102 also has a bottom plate portion 115 in which bolt holes 108 are formed, and rising plate portions 116 are provided at both ends of the bottom plate portion 115, and each rising plate portion 116 has a long hole portion 117 formed therein.

[0054] Furthermore, the abutment receiving body 103 has an attachment member 123 that is supported on the support frame 102 via a first pin 121 and a second pin 122 so that its posture can be changed, and a cylindrical abutment receiving member 125 that is detachably attached to this attachment member 123 by an attachment means 124.

[0055] The attachment means 124 is, for example, a bolt 126 and a nut 127. The contact receiving member 125 is, for example, an elastically deformable collar (cylindrical member) 128 made of rubber, resin, or the like. Note that a shaft 126a of the bolt 126 is detachably fitted into the cylindrical contact receiving member 125 as a core member.

[0056] The mounting member 123 has a pair of opposing plate portions 129 that are spaced apart and face each other, and these opposing plate portions 129 are connected by an elongated connecting plate portion 130. Each opposing plate portion 129 has a first hole portion 131, a second hole portion 132, a third hole portion 133, and a bolt hole portion 134 formed therein.

[0057] Here, as shown in Figure 10, the distance A1 between the first hole portion 131 and the second hole portion 132 of the mounting member 123 of the abutment receiving body 103 is the same as the distance A2 between the first hole portion 131 and the third hole portion 133 of the mounting member 123 of the abutment receiving body 103.

[0058] When the contact receiving body 103 is in the first state (when working in the folded state) shown in Figure 10(a), the first pin 121 is inserted into the first hole portion 131 and one end of the elongated hole portion 117 and is prevented from coming out by a stopper member (e.g., a split pin, etc.) 136, and the second pin 122 is inserted into the other end of the second hole portion 132 and the elongated hole portion 117 and is prevented from coming out by a stopper member (e.g., a tool-less detachable member such as an R pin, etc.) 137.

[0059] On the other hand, in the second state of the receiving body 103 shown in FIG. 10(b) (when not in operation in the folded state), the first pin 121 is inserted through the other end of the first hole portion 131 and the long hole portion 117 and is prevented from coming off by the retaining member 136, and the second pin 122 is inserted through one end of the third hole portion 133 and the long hole portion 117 and is prevented from coming off by the retaining member 137.

[0060] Therefore, when changing the receiving body 103 from the first state to the second state or from the second state to the first state, the operator can simply remove only the second pin 122 without removing the first pin 121, and slide the first pin 121 along the long hole portion 117 while rotating the receiving body 103 about the first pin 121 by approximately 90 degrees with respect to the support frame 102, thus easily changing the state of the receiving body 103.

[0061] And, as shown in FIG. 11, when the receiving member 125 of the receiving body 103 in the first state abuts against the abutting portion (a part of the first connecting arm 144 described later) 64, the longitudinal dimension L1 of the agricultural working machine 1 in the front-rear direction is longer than the longitudinal dimension L2 of the agricultural working machine 1 in the front-rear direction when the receiving member 125 of the receiving body 103 in the second state abuts against the abutting portion 64 as shown in FIG. 12.

[0062] In other words, the longitudinal dimension L2 of the agricultural working machine 1 in the state shown in FIG. 12 is shorter than the longitudinal dimension L1 of the agricultural working machine 1 in the state shown in FIG. 11 (L2 < L1). In the state shown in FIG. 11, the downward rotation of the extended tilling body 43 of the extended working portion 3 is restricted by the abutment of the second abutting means 67, and the upward rotation of the extended tilling body 43 of the extended working portion 3 is restricted by the abutment between the side plate 51a of the first tilling member 51 and the protruding member (e.g., a high nut, etc.) 140.

[0063] And, in the state shown in FIG. 11, the extended tilling body 43 of the extended working portion 3 in the folded non-operating state is supported above the central tilling body 13 by the receiving body 103 in the first state. Therefore, when working only with the central working portion 3, the central tilling body 13 does not contact the extended tilling body 43, and the extended tilling body 43 is also prevented from contacting the field surface (farm field surface).

[0064] On the other hand, in the state shown in FIG. 12, the extension leveling body 43 of the extension working part 3 in the folded non-working state is supported in a state of hanging down by the receiving body 103 in the second state. As a result, "L2 < L1", and for example, compactification in the front-rear direction can be achieved during non-working times such as storage in a warehouse or transportation by a truck.

[0065] The other abutting part 64 is constituted by, for example, a part of a connecting body 141 that connects the extension fuselage 41 and the extension leveling body 43.

[0066] The connecting body 141 has a long and narrow U-shaped first connecting arm (first connecting member) 144 whose front end is rotatably attached to an attachment part 142 provided on the tilling cover part 45 of the extension fuselage 41 via a pin 143, and a long and narrow U-shaped second connecting arm (second connecting member) 146 whose upper end is rotatably attached to the rear end part of the first connecting arm 144 via a pin 145. Further, the lower end part of the second connecting arm​​​​​​​​​​​The first rotating body 151 is rotatably mounted on the central holding body 71 of the central working unit 2, and the second rotating body 152 is connected to the extension working unit 3 via an intermediate shaft 155 fixed to the extension side holding body 81 of the extension working unit 3.

[0070] In addition, a locking means 153 is connected to the second rotating body 152, which locks the extension working unit 3 to the central working unit 2 when the extension working unit 3 is in the deployed working state, and the locking by this locking means 153 is released by the rotation of the first rotating body 151 in conjunction with the extension and contraction of the cylinder 7.

[0071] Next, the operation of the agricultural work machine 1 will be described.

[0072] For example, as shown in Figure 3, when the agricultural work machine 1 with the left and right extension working parts 3 deployed moves forward in the field in the direction of travel due to the tractor's movement, the tilling bodies 12, 42 perform tilling work, and behind them, the leveling bodies 13, 43 perform ground leveling work.

[0073] After the agricultural machine 1 has completed the tilling and leveling work (plowing work), the extension working unit 3 rotates in the folding direction based on the contraction action of the cylinder 7 of the pivoting drive unit 4 to enter a folded non-working state (storage position), and one and the other abutment parts 63, 64 abut against one and the other abutment receiving parts 61, 62, and this abutment restricts the downward rotation of the extension working unit 3.

[0074] Therefore, with this type of agricultural work machine 1, the load on the abutment receiving portions 61, 62 and the abutment portions 63, 64 is smaller than in conventional configurations in which only the rod portion abuts against a receiving member (abutment receiving portion) at one location, so defects such as deformation are less likely to occur and there is no need to replace parts frequently, thereby reducing the burden on the worker and also suppressing (preventing) the occurrence of defects such as the storage position of the extension working portion 3 shifting due to deformation and coming into contact with other parts.

[0075] Furthermore, at least one of the two contact portions 63, 64 comes into planar contact with the corresponding contact receiving portions 61, 62, so that the load on them can be further reduced, and the occurrence of defects such as deformation can be appropriately suppressed.

[0076] Furthermore, the height of the contact member 83 and the contact receiving member 125 of the contact receiving body 103 can be adjusted by the spacers 95, 111, 112, so that the storage position of the extension working unit 3 and the holding position of the extension leveling body 43 can be adjusted appropriately.

[0077] Furthermore, the abutment member 83 is made of an elastic plate 98 having a core material 97 therein, and the abutment receiving member 125 is a rubber or resin collar fitted with the shaft portion 126a of the bolt 126 as the core material, so that it is possible to suppress, for example, deformation of the abutment member 83 or the abutment receiving member 125, noise due to abutment, scratches on metal parts, paint peeling, etc.

[0078] Furthermore, the longitudinal length dimension L2 of the agricultural working machine 1 in the folded state when the abutment receiving body 103 is in the second state is shorter than the longitudinal length dimension L1 of the agricultural working machine 1 in the folded state when the abutment receiving body 103 is in the first state, so that the agricultural working machine can be made compact when not in use, for example, when stored in a warehouse or transported by truck.

[0079] The agricultural work machine is not limited to a folding work machine with a foldable three-part structure (a configuration including a central working section and left and right extended working sections), but may be configured to include, for example, a working section connected to a traveling vehicle and an extended working section provided at only one of the left and right ends of the working section.Furthermore, the agricultural work machine is not limited to a configuration in which the left and right extended working sections are folded symmetrically, but may be configured such that the left and right extended working sections overlap each other when viewed from the front or in a plan view when folded.

[0080] Furthermore, the leveling bodies (central leveling bodies, extended leveling bodies) used for leveling and earthmoving work are not limited to those having a first leveling member and a second leveling member, but may, for example, have only the first leveling member, or may be configured such that the leveling body is 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 plate.

[0081] Furthermore, the configuration is not limited to one in which a cushioning elastic body such as a rubber plate with a core material is removably attached to the holding body of the extension side holding body, and may be, for example, a configuration in which a cushioning elastic body (abutment member, abutment receiving member) is removably attached to the holding body of the central side holding body or the longitudinal plate portion of the first connecting arm. [Explanation of symbols]

[0082] 1 Agricultural machinery 2. Central working section 3 Extension work section 5 Rotational axis 41 aircraft, an extended aircraft 43 Extended leveling body that is a leveling body 61 One contact receiving part 62 Other contact receiving parts 63 One contact part 64 Other abutments 81 Extension side holder which is a holder 82 Holding body 83 Contact member 97 Core material 98 Elastic plate, an elastic body 103 Contact receiving body 141 Concatenation L1: The length dimension in the front-to-rear direction of the agricultural implement when the contact receiving body is in the first state L2: The length dimension in the front-to-rear direction of the agricultural implement when the contact receiving body is in the second state

Claims

1. a working unit coupled to the traveling vehicle; an extension working unit that can be switched between an extended working state and a folded non-working state; the working portion has one abutment receiving portion and another abutment receiving portion, the extension working portion has one abutting portion and another abutting portion, When the extension working unit is switched to the folding non-working state, the one abutting portion abuts against the one abutting receiving portion, and the other abutting portion abuts against the other abutting receiving portion. Agricultural machinery characterized by:

2. At least one of the first contact portion and the second contact portion is brought into surface contact with the corresponding contact receiving portion.

2. The agricultural implement according to claim 1.

3. the extension working unit is rotatable about a rotation central axis relative to the working unit; The first contact portion is formed by a part of a holder that holds the rotation center shaft.

3. The agricultural machine according to claim 1 or 2.

4. The holder is a holding body that holds the rotation center shaft; a contact member that is detachably provided on the holding body and that constitutes one contact portion; 4. The agricultural implement according to claim 3.

5. The abutment member is height adjustable 5. The agricultural implement according to claim 4.

6. The contact member is made of an elastic body having a core material inside.

5. The agricultural implement according to claim 4.

7. The extension work unit has a leveling body that can rotate up and down relative to the machine body, The other contact portion is configured as a part of a connecting body that connects the machine body and the ground leveling body.

3. The agricultural machine according to claim 1 or 2.

8. The other contact receiving portion has a contact receiving body that can be changed between a first state and a second state, The length dimension of the contact receiving body in the front-rear direction of the agricultural work machine when in the second state is shorter than the length dimension of the contact receiving body in the front-rear direction of the agricultural work machine when in the first state.

8. The agricultural implement according to claim 7.

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