Agricultural working machine

Abstract

To provide an agricultural working machine capable of properly locking an extension working part in a developed working state.SOLUTION: The agricultural implement is equipped with an engaging means 71 for locking the extended operation part 3 in a developed operation state. Further, the engagement means 71 includes an engagement receiving pin 72 having an engagement receiving portion 101, and an engagement hook 73 having an engagement recess 102 that engages with the engagement receiving portion 101 when the extension work unit 3 is in the deployment work state. The engaging recessed part 102 of the engaging hook 73 is positioned above the upper end position of the tilling cover part 45 of the extended working part 3 in the extended working state of the extended working part 3.SELECTED DRAWING: Figure 7

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 connected to a traveling vehicle such as a tractor, an extension working unit which is rotatably mounted on the central working unit, and a switching unit which rotates the extension working unit relative to the central working unit to switch between an unfolded working state (working state) and a folded non-working state (storage state).

[0004] The switching portion also includes, for example, a control cylinder, a shield cover connecting portion, a shield cover linking portion, a protrusion, a lock linking arm, a lock member, and a lock receiving member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-123815 Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the above-mentioned conventional agricultural work machines, for example, when working in a field, mud or debris may adhere to the locking member or lock receiving member of the switching section, and in such cases, a problem may occur in which the extended working section does not lock (fix) in the extended working state.

[0007] Therefore, one object of the embodiments of the present invention is to provide an agricultural work machine that can appropriately lock an extended working section in an extended working state. [Means for solving the problem]

[0008] An agricultural working machine according to an embodiment of the present invention comprises a working unit that is connected to a running vehicle, an extended working unit that can be switched between an unfolded working state and a folded non-working state, and an engagement means for locking the extended working unit in the unfolded working state, wherein the extended working unit comprises a tilling cover unit that covers the tilling body, and the engagement means comprises an engagement receiving body having an engagement receiving portion and an engagement body having an engagement portion that engages with the engagement receiving portion when the extended working unit is in the unfolded working state, and the engagement portion is positioned above the upper end position of the tilling cover unit when the extended working unit is in the unfolded working state. [Effects of the Invention]

[0009] According to an embodiment of the present invention, the extension working section can be appropriately locked in the deployed working state. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a side view of an agricultural work machine according to one embodiment of the present invention (with the extension working unit in an extended working state). FIG. [Figure 2] FIG. 2 is a side view of the same agricultural work machine (with the extension working section folded and in a non-working state). [Figure 3] FIG. 2 is a plan view of the same agricultural work machine (when the extension working section is in an extended working state). [Figure 4] FIG. 2 is a partial view taken along the arrow A in FIG. [Figure 5] 4 is a schematic diagram illustrating the operation when the engaging means (locking means) of the agricultural work machine is unlocked. FIG. [Figure 6] 1(a) is a schematic partial cross-sectional view of the same agricultural work machine (when the extended working section is in an extended working state), and FIG. 1(b) is a partially enlarged view of FIG. [Figure 7] 1A is a schematic partial cross-sectional view of the agricultural work machine (when the extended working section is in an extended working state), and FIG. 1B is a schematic partial cross-sectional view of the agricultural work machine when working in a field. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described with reference to FIGS.

[0012] 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.

[0013] 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.

[0014] 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, and this cylinder 7 is appropriately controlled by a control unit 8 based on remote control operation by the operator.

[0015] 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.

[0016] 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 (folded state), 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 (unfolded state), 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 (folded state).

[0017] The unfolded state of the agricultural work machine 1 is a state in which the left and right extension working units 3 are switched to an unfolded working state (a working state in which the extension working units 3 are located to the sides of the central working unit 2). The folded state of the agricultural work machine 1 is a state in which at least one of the left and right extension working units 3 is switched to a folded non-working state (a stored state in which the extension working unit 3 is located above the central working unit 2).

[0018] The central working unit 2 comprises a central body 11, which is a machine that is detachably connected to the three-point link section 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 leveling body that is rotatably mounted in the vertical direction at the rear end of the tilling cover section 25 of the central body 11 and performs ground leveling work behind the central tilling body 12.

[0019] The central leveling body 13 performs leveling work when in the leveling work state (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.

[0020] 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.

[0021] The three-point connection part 15 can be connected to the three-point link part, for example, via a quick coupler (auto hitch) that is pre-attached to the three-point link part, and is composed 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.

[0022] The central machine body 11 also has a transmission case 22, which is an input shaft holder that rotatably holds an input shaft 21 connected to the PTO shaft at the rear of the tractor via a joint.

[0023] 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 transmission case body, is attached to the outer end (left end) of the frame pipe 23 on one side, the left side (left side in the direction of travel). A roughly plate-shaped bracket (not shown) is attached to the outer end (right end) of the frame pipe 23 on the other side, the right side (right side in the direction of travel). The central tiller 12 is rotatably supported by the chain case 24 and the brackets, which are left and right support parts that face each other at a distance.

[0024] 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.

[0025] The upper part of the central tillage body 12 is covered by a plate-shaped tillage cover portion 25 of the central machine body 11. In addition, a clutch member (one-side clutch) 28 for power transmission is provided at both left and right ends (outer left and right ends) of the tillage shaft 26 of the central tillage body 12.

[0026] 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.

[0027] 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 in the vertical direction around a rotation center axis 5; an extended tilling body 42, which is a tilling body rotatably mounted on the extended body 41 and which performs tilling work by 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 a soil leveling body mounted on the rear end of the tilling cover part 45 of the extended body 41 so as to be rotatable in the vertical direction and which performs soil leveling work behind the extended tilling body 42 together with the central soil leveling body 13 when the extended working unit 3 is in the extended working state.

[0028] In addition, like the central leveling body 13, the extended leveling body 43 also performs leveling work when in the leveling work state (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.

[0029] 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.

[0030] When the extended working unit 3 is in the extended working state, the upper part of the extended tilling body 42 of the extended working unit 3 in this extended working state is covered by the tilling cover part 45 of the extended body 41. In other words, the extended working unit 3 is provided with a plate-shaped tilling cover part 45 that covers the upper part of the extended tilling body 42 in the extended working state.

[0031] In addition, a clutch member (other side clutch) 48 for power transmission that can be engaged and disengaged with the clutch member 28 of the central tiller body 12 is provided at the inner end of the tiller shaft 46 of each of the left and right extension tiller bodies 42.

[0032] 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.

[0033] An extension rake 53 is provided at the outer end of the second ground leveling member 52, and this extension rake 53 is selectively switched by an extension rake switching section (opening / closing unit) 55 between an extended working state and a folded non-working state.

[0034] In addition, 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) for selectively switching 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).

[0035] On the other hand, the rotation drive unit (state switching unit) 4 is capable of rotating the extension working unit 3 relative to the central working unit 2, selectively switching the state of the extension working unit 3 between an unfolded working state and a folded non-working state, and as shown in Figures 4 and 5, for example, in addition to a cylinder 7 which is an extendable drive body, it has a first rotation body (link arm) 61 which is rotatably connected to the tip of the rod portion 7a of the cylinder 7 via a pin (axis) 63 and is rotatable around a rotation center axis 64 relative to the central working unit 2, and front and rear second rotation bodies (link plates) 62 which are rotatably connected to this first rotation body 61 via a connecting axis 65 and are rotatable and movable relative to the extension working unit 3.

[0036] A rotation center shaft (link arm rotation fulcrum shaft) 64, which is the rotation center of the first rotating body 61, is provided in the central side holder 58 that holds the rotation center shaft 5, which is the rotation center of the extension working unit 3. Each second rotating body 62 has an elongated hole 66, and an intermediate shaft 67, which protrudes from the extension side holder 59 that holds the rotation center shaft 5, is slidably inserted into the elongated hole 66. As a result, each second rotating body 62 is rotatable about the intermediate shaft 67 relative to the extension working unit 3 and is movable along the elongated hole 66. A guide roller 68, which comes into contact with the arm plate portion 60 of the first rotating body 61 and guides the rotation of the extension working unit 3, is rotatably provided on the intermediate shaft 67 (see FIG. 6(a)).

[0037] The rotation drive unit 4 also has an engagement means 71 for restricting the rotation of the extension working unit 3 in the folding direction relative to the central working unit 2 and locking the extension working unit 3 in the deployed working state, and this engagement means 71 is connected to the front second rotating body 62. The engagement means 71 is a locking means (engagement and fixing means) for releasably locking (fixing) the extension working unit 3 in the deployed working state to the central working unit 2 when the extension working unit 3 is in the deployed working state.

[0038] As shown in Figures 4 to 7, the engagement means 71 has an engagement receiving pin (lock pin) 72, which is an engagement receiving body fixedly provided on the central working unit 2 side, and an engagement hook 73, which is a fixed engagement body rotatably provided on the extension working unit 3 side and which releasably engages with the engagement receiving pin 72 when the extension working unit 3 is in the unfolded working state, thereby restricting the rotation of the extension working unit 3 in the folding direction.

[0039] The engagement receiving pin 72 is made of, for example, a pin member (shaft member) in the shape of a round shaft with a uniform diameter, and is attached to and fixedly supported by a U-shaped pin support frame (support body) 75.

[0040] The pin support frame 75 is attached to the side plates 77 of the tilling cover section 25 of the central working section 2 by attachment means (bolts, nuts, etc.) 76 so as to protrude outward. That is, for example, the pin support frame 75 has a pair of front and rear opposing plate sections 78 that are spaced apart and facing each other, and a connecting plate section 79 that connects these opposing plate sections 78, and these connecting plate sections 79 are detachably attached to the side plates 77 by the attachment means 76. Also, attachment holes 78a are formed in each opposing plate section 78, and engagement receiving pins 72 are inserted into these attachment holes 78a, whereby these engagement receiving pins 72 are fixedly attached to both opposing plate sections 78. A reinforcing plate 80 is attached to the tilling cover section 25 of the central working section 2.

[0041] The engagement hook 73 consists of a hook-shaped plate member that can rotate around a rotation center axis 81 based on the expansion and contraction of the cylinder 7, for example, and is rotatably attached to a small-diameter hook attachment shaft portion 82 of the rotation center axis 81.

[0042] The pivot shaft 81, which is a shaft member, is composed of a hook attachment shaft 82, which is a small-diameter shaft portion that rotatably supports the engagement hook 73, and a large-diameter shaft portion 83 that is formed with a larger diameter than the hook attachment shaft 82. On the other hand, a collar 74 having a circular shaft hole 84 is fixed to the engagement hook 73, and the hook attachment shaft 82 is inserted into the shaft hole 84. The lower end face of the collar 74 is slidably supported by the large-diameter shaft portion 83.

[0043] The pivot axis (hook pivot axis) 81, which is the pivot center of the engagement hook 73, protrudes from a positioning plate 85 attached to the extension-side holder 59. The positioning plate 85 is formed with a positioning recess 86 against which the engagement receiving pin 72 abuts when the extension working unit 3 is in the extended working state. A reinforcing plate 87 is attached to the tillage cover unit 45 of the extension working unit 3.

[0044] Furthermore, the engagement hook 73 is connected to the front second rotating body 62 via a connecting mechanism 90. The connecting mechanism 90 includes a substantially U-shaped connecting frame 92 that is rotatably connected to the front second rotating body 62 via a connecting shaft 91, a connecting rod 94 that is movably provided on the connecting frame 92 and has a tip end that is rotatably connected to the engagement hook 73 via the connecting shaft 93, and a coil spring 95 that is a biasing member that biases the connecting rod 94 toward the engagement hook 73. The rear second rotating body 62 does not include the connecting shaft 91 and has a different shape from the front second rotating body 62, but a spring with the same shape may be used.

[0045] Furthermore, the engagement hook 73 has an engagement recess 102 which is a fixing engagement portion that can be detachably engaged with the engagement receiving portion 101 of the engagement receiving pin 72 that abuts against the recess 86 of the positioning plate 85 when the extension working unit 3 is in the deployed working state.

[0046] In other words, when the extension working unit 3 is in the deployed working state, the extension working unit 3 is locked (restricted from rotating) in a predetermined deployed working state by engagement (contact) between the engagement receiving portion (part of the round shaft-shaped shaft member) 101 of the engagement receiving pin 72, which is the one-side engaging member, and the engagement recess (part of the plate member) 102 of the engagement hook 73, which is the other-side engaging member, and the deployed working state is maintained.

[0047] The engagement receiving portion 101 with which the engagement recess 102 comes into contact is configured at an axially intermediate portion, i.e., for example, at approximately the axial center portion, which is a part of the engagement receiving pin 72. More specifically, the engagement receiving portion 101 is configured at, for example, a part of the outer peripheral surface (the portion that faces and comes into contact with the engagement recess 102) at approximately the axial center portion of the engagement receiving pin 72.

[0048] 5, the engagement pin 72 and the rotation central shaft (hook rotation fulcrum shaft) 81, which are parallel to each other, are located at the same height. That is, for example, the center P1 of the engagement pin 72 and the center P2 of the rotation central shaft 81 are located at the same height. The axis of the engagement pin 72 and the axis of the rotation central shaft 81 coincide in a side view when the extension working unit 3 is in the deployed working state (see FIG. 7(b)).

[0049] Furthermore, as can be seen from Figure 6, the hook attachment shaft portion 82 of the pivot center shaft 81 is positioned above the upper end position of the tillage cover portion 45 of the extended working unit 3 in this extended working state when the extended working unit 3 is in an extended working state in the working position (a position in which the upper surfaces 103, 104 of the tillage cover portion are positioned approximately horizontally).

[0050] That is, for example, when the agricultural work machine 1 is in a working posture, the hook attachment shaft 82 of the pivot shaft 81 is located above the horizontal cover upper surface 103 of the tilling cover part 45 of the extended working unit 3 in the extended working state in a side view. At this time, the horizontal cover upper surface 104 of the tilling cover part 25 of the central working unit 2 is located in a position that coincides with (is at the same height as) the cover upper surface 103 of the extended working unit 3 in the extended working state in a side view.

[0051] Furthermore, as can be seen from Figure 7, the engaging receiving portion 101 and the engaging recess 102 that engage with each other are positioned above the upper end position of the tilling cover portion 45 of the extended working unit 3 in this extended working state when the extended working unit 3 is in the working posture.

[0052] That is, for example, when the agricultural work machine 1 is in a working posture, the engagement receiving portion 101 and the engagement recess 102 are located above the horizontal cover upper surface 103 of the tilling cover portion 45 of the extended working unit 3 in the extended working state in a side view. At this time, the horizontal cover upper surface 104 of the tilling cover portion 25 of the central working unit 2 is located in a position that coincides with (is at the same height as) the cover upper surface 103 of the extended working unit 3 in the extended working state in a side view.

[0053] In this way, the hook mounting shaft 82, engagement receiving portion 101, and engagement recess 102 are all located at a position higher than the cover upper surfaces (upper end positions of the tilling cover portions) 103, 104, which are at the same height, when the extended working unit 3 is in the deployed working state in the working posture. In addition, the two parallel shaft members (engagement receiving pin 72, pivot center shaft 81) positioned at an incline with the front high and the rear low are located above the front of the tilling cover portions 25, 45 in a side view.

[0054] Figure 7(a) shows the state in which the engagement recess 102 of the engagement hook 73 is engaged with the engagement receiving portion 101 of the engagement receiving pin 72, and the lower end 102a of the engagement recess 102 in this engaged state is located at a position slightly above (at approximately the same height as) the upper end position of the tillage cover portion 45 of the extension working unit 3 in the deployed working state when viewed from the side.

[0055] Furthermore, when the extended working unit 3 is in the extended working position, the engagement hook 73 and engagement receiving pin 72 are located rearward of the front end position of the tilling cover part 45 of the extended working unit 3 in this extended working state.

[0056] That is, for example, when the agricultural work machine 1 is in a working posture, the engagement hook 73 and engagement receiving pin 72 are located rearward of the vertical cover front surface 105 of the tilling cover part 45 of the extension working unit 3 in the deployed working state in a side view, and are located forward of the front end of the cover upper surface 103 of the tilling cover part 45. In other words, the engagement hook 73 and engagement receiving pin 72 are located above the cover inclined surface 110 of the tilling cover part 45 in a side view.

[0057] At this time, the vertical cover front surface 106 of the tilling cover section 25 of the central working section 2 is positioned in a position that coincides with the cover front surface 105 of the extension working section 3 in the deployed working state in a side view.

[0058] Next, the operation of the agricultural work machine 1 will be described.

[0059] For example, as shown in Figure 3, when the agricultural work machine 1 is in an unfolded state with the left and right extension working units 3 locked in the unfolded working state by the left and right engagement means (locking means) 71, and moves forward in the field in the direction of travel as the tractor travels, the tilling bodies 12, 42 perform tilling work, and behind them, the soil leveling bodies 13, 43 perform soil leveling work. In this way, the agricultural work machine 1 in this working position performs tilling and soil leveling work (plowing work).

[0060] Here, for example, when the extension working unit 3 is rotated in the folding direction to switch to the folding non-working state, the worker operates a predetermined button (close button for the extension working unit) provided on the remote controller.

[0061] Then, as shown in Figure 5, the cylinder 7 of the rotation drive unit 4 begins to contract from the locked state shown by the solid line, and in response to this contraction, the first rotating body 61 rotates around the rotation center axis 64 relative to the central working unit 2, and the second rotating body 62 rotates around the connecting axis 65 relative to the first rotating body 61, and the first rotating body 61 is lifted by the amount of the long hole portion 66, thereby entering the unlocked state shown by the dotted line.

[0062] As a result, the engaging hook 73 rotates around the central axis of rotation 81 relative to the extension working unit 3, and this rotation causes the engaging recess 102 to separate from the engaging receiving portion 101, thereby releasing the lock (rotation restriction) of the extension working unit 3 by the engaging means 71.

[0063] Then, as the cylinder 7 further contracts, the extension working unit 3 in the unlocked state rotates in the folding direction around the rotation center shaft 5 relative to the central working unit 2, and enters the folding non-operating state.

[0064] Furthermore, for example, when the extension working unit 3 is rotated in the deployment direction to return to the deployment working state, the worker operates a predetermined button (open button for the extension working unit) provided on the remote control, which causes the cylinder 7 to extend and the extension working unit 3 to rotate in the deployment direction, resulting in the engagement recess 102 abutting and engaging with the engagement receiving portion 101 as shown by the solid line in Figure 5, thereby locking the extension working unit 3 in the deployment working state.

[0065] When performing tilling work (plowing and leveling work) with this agricultural work machine 1 set in a working position by the three-point linkage part of the tractor, for example, when there is a lot of water in the field or when the tilling depth temporarily becomes deep due to unevenness, as shown in Figure 7(b), debris and mud on the water surface may ride up onto the tilling cover parts 25, 45 and accumulate as sediment a, but this sediment a will not reach the position of the engagement receiving pin 72 or engagement hook 73 of the engagement means 71 and accumulate in large amounts, thereby preventing mud and debris from adhering to the engagement means 71.

[0066] In other words, in this agricultural work machine 1, as shown in Figure 7(a), the engagement receiving portion 101 and the engagement recess 102 that engage with each other when the extended working unit 3 is in the extended working state are, in their entirety when viewed from the side, located above the upper end position (top surface of the horizontal cover) of the tilling cover portion 45 of the extended working unit 3 in the extended working state and behind the front end position (front surface of the vertical cover) of the tilling cover portion 45, thereby preventing dirt, debris, and other deposits that have risen up onto the tilling cover portions 25, 45 from adhering to the engagement receiving portion 101 and the engagement recess 102, and also preventing mud scattered from the tractor tires from adhering to them.

[0067] Therefore, with such an agricultural implement 1, when performing tilling work in a field such as a rice paddy with a large amount of water, it is possible to prevent adhesion of mud, debris, and other foreign matter to the engagement receiving pin 72 and engagement hook 73 of the engagement means 71, so that, for example, adhesions will not get stuck between the engagement receiving portion 101 and the engagement recess 102, and it is possible to prevent the occurrence of a problem where the extension working unit 3 is affected by adhesions and cannot be locked in the extended working state, and therefore the engagement means 71 can appropriately lock the extension working unit 3 in the desired extended working state.

[0068] Furthermore, since dirt and other adhering matter from the field is less likely to adhere to the engagement receiving portion 101, engagement recess 102, and hook mounting shaft portion 82, not only can the extension working portion 3 be securely locked in the extended working state by the engagement means 71, but cleaning work (such as removing adhering matter) by the worker after tilling work is also made easier, thereby reducing the burden on the worker.

[0069] 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.

[0070] Furthermore, the leveling bodies (central leveling body, extended leveling body) that perform at least the leveling 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 part (central tilling cover part, extended tilling cover part) via an elastic plate such as a rubber plate.

[0071] Furthermore, the configuration is not limited to one in which a portion of the engaging receiving body (the portion on the lower end side) is positioned below the upper end position of the tilling cover portion of the extended working section when the extended working section is in the extended working state, but may also be one in which, for example, the entire engaging receiving body (the entire pin) is positioned above the upper end position of the tilling cover portion.

[0072] Similarly, the configuration is not limited to one in which part of the engaging body or part of the pivoting center axis, which is the pivoting center of this engaging body, is located below the upper end position of the tilling cover part of the extended working part in this extended working state when the extended working part is in this extended working state, but may be, for example, one in which the entire engaging body or the entire pivoting center axis is located above the upper end position of the tilling cover part. [Explanation of symbols]

[0073] 1 Agricultural machinery 2. Central working section 3 Extension work section 42 Extended tillage body, which is a tillage body 45 Tillage cover part 71 Engagement means 72 Engagement receiving pin which is an engagement receiving body 73 Engagement hook as an engagement body 81 Rotational axis 82 Hook mounting shaft 101 engagement receiving portion 102 Engagement recess serving as an engagement portion

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; and engaging means for locking the extension working section in an extended working state; The extension working unit includes a tillage cover unit that covers the tillage body, The engagement means an engagement receiving body having an engagement receiving portion; an engaging body having an engaging portion that engages with the engagement receiving portion when the extension working unit is in an extended working state; The engaging portion is positioned above the upper end position of the tilling cover portion when the extension working portion is in the extended working state. Agricultural machinery characterized by:

2. The engagement body is an engagement hook that is rotatable around a rotation center axis, the pivot shaft has a hook mounting shaft portion to which the engaging hook is rotatably mounted, The hook attachment shaft is positioned above the upper end position of the tilling cover when the extension working unit is in the deployed working state.

2. The agricultural implement according to claim 1.

3. The engagement hook is located rearward of the front end position of the tilling cover when the extension working section is in the deployed working state.

3. The agricultural implement according to claim 2.

4. The engagement receiving body is an engagement receiving pin, The engagement receiving portion is configured at the axially intermediate portion of the engagement receiving pin, and is located above the upper end position of the tilling cover portion when the extension working section is in the deployed working state.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

5. The engagement receiving body is provided on the working unit side, The engagement body is provided on the extension working part side.

4. The agricultural machine according to claim 1, wherein the first and second axes are parallel to each other.

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