JP5479299B2 - Agricultural machine - Google Patents

Description

  The present invention relates to an agricultural machine that can perform appropriate tillage work.

  Conventionally, for example, an agricultural machine described in Patent Document 1 is known.

  This conventional agricultural work machine is selected as a central working unit that is a working unit connected to the rear part of a tractor that is a traveling vehicle, and a folding non-working state and an unfolding working state provided at both left and right ends of the central working unit. And an extension working section that can be switched automatically.

  In addition, the central working unit includes a cultivating body that performs tilling work and a leveling body that performs leveling work behind the cultivating body. The extension work section includes an extended tillage body that performs tillage work and an extended leveling body that performs leveling work behind the extension tillage body.

  Furthermore, the extended leveling body of the extension working part has a connection hole. The leveling body of the central working part has a connecting pin inserted into the connecting hole when the extended working part is deployed, and a biasing member such as a coil spring that biases the connecting pin toward the connecting hole. Yes.

JP 2003-304707 A (FIG. 4 etc.)

  However, in the conventional agricultural machine described above, since the leveling body and the extended leveling body are always engaged and connected via the connection pins when the extension work part is deployed, for example, a relatively large stone Even when the landslide hits only one of the leveling body and the extended leveling body, both the leveling body and the extended leveling body move up, resulting in a wide step in the field scene. There is a risk that malfunction will occur and proper tillage work will not be possible.

  This invention is made | formed in view of such a point, and it aims at providing the agricultural machine which can perform suitable tillage work.

  The agricultural working machine according to claim 1, comprising a working unit connected to the traveling vehicle, and an extension working unit provided in the working unit and selectively switched between a folding non-working state and a deployment working state, The working unit includes a cultivated body that performs the tilling work and a leveling body that performs the leveling work behind the cultivated body, and the extension working unit includes the extended cultivated body that performs the cultivating work and the rear of the extended cultivated body. An extended leveling body that performs leveling work, and one of the leveling body and the extended leveling body has an engagement receiving member, and the other of the leveling body and the extended leveling body is the extension work. A movable engagement member that is detachably engaged with the engagement receiving member when the portion is deployed, and a biasing member that biases the movable engagement member toward the engagement receiving member. When the extension working part is in the unfolding work state, the movable engagement member is moved forward. Against the biasing force of the biasing member in which the engagement between said movable engagement member is movable the engagement receiving member is released.

  The farm work machine according to claim 2 is the farm work machine according to claim 1, wherein the engagement receiving member has a pair of engagement receiving projections that are spaced apart from each other, and the movable engagement member is the both engagements. An engaging portion that enters and exits between the receiving projections, and when the impact force is applied to only one of the leveling body and the extended leveling body, the movable engaging member is The movable engagement member is again moved to the engagement receiving projection after the engagement portion is pulled out between the both engagement receiving projections by being pushed and moved against the biasing force of the biasing member. The engagement portion enters between the two engagement receiving projections by being moved against the urging force of the urging member.

  The agricultural machine according to claim 3 is the agricultural machine according to claim 2, wherein each of the engagement receiving protrusions engaged with the engaging part is an engagement receiver positioned along the moving direction of the movable engaging member. And the movable engaging member when an impact force is applied to only one of the leveling body and the extended leveling body. Is pushed by the engagement receiving surface to move against the urging force of the urging member, so that the engagement portion comes out from between both the engagement receiving projections, and then again the movable engagement. When the member is pushed by the inclined guide surface and moves against the urging force of the urging member, the engaging portion enters between the two engagement receiving projections.

  The agricultural machine according to claim 4 is the agricultural machine according to claim 2 or 3, wherein the engaging portion of the movable engaging member is a round bar, and the protruding length of the engaging receiving protrusion of the engaging receiving member. The height dimension is larger than the radial dimension of the engaging part and smaller than the diameter dimension of the engaging part.

  The agricultural machine according to claim 5 is the agricultural machine according to any one of claims 1 to 4, wherein the urging force of the urging member can be adjusted.

  According to the present invention, the movable engagement member is moved against the urging force of the urging member when the extension working portion is in the unfolding operation state, and the engagement between the movable engagement member and the engagement receiving member is released. Because of the configuration, appropriate tillage work can be performed.

It is a side view of the agricultural working machine which concerns on one embodiment of this invention. It is an expansion | deployment top view of an agricultural working machine same as the above. It is an expansion | deployment top view of an agricultural working machine same as the above. It is a partial side view at the time of work of a farm working machine same as the above. It is a figure which shows the connection means of an agricultural working machine same as the above. It is VI-VI sectional drawing of FIG. It is the elements on larger scale of FIG. (A)-(h) is operation | movement explanatory drawing in case an impact force is added to the extension leveling body of an extension operation part. (A)-(h) is operation | movement explanatory drawing when impact force is added to the central leveling body of a central working part.

  An embodiment of the present invention will be described with reference to the drawings.

  1 to 3, reference numeral 1 denotes a farm working machine. The farm working machine 1 is a tillage level working machine (rotary) used by being connected to a rear portion of a tractor (not shown) that is a traveling vehicle, for example. That is, the farm work machine 1 is a foldable work machine that performs the tilling work while moving on the farm field toward the front, which is the traveling direction, by traveling of the tractor while being connected to the rear part of the tractor.

  The farm work machine 1 includes a central work part 2 that is connected to a three-point link part (work machine lifting device) at the rear part of the tractor, and is a work part having a longitudinal direction that receives power from the tractor side and performs tilling work. ing.

  The agricultural working machine 1 is provided at both ends in the left and right direction of the central working unit 2 so as to be pivotable in the vertical direction about the folding shaft 4 that is a pivotal fulcrum. It is selectively switched to the unfolding work state, and is provided with left and right extending work parts 3 having a left-right direction that receives power from the central work part 2 side and performs the tilling work in the unfolding work state.

  Each extension work part 3 is rotatable about a rotation center axis A with respect to the central work part 2 located at the central part of the agricultural work machine 1, and has a predetermined angle in one direction (deployment direction), for example, approximately The unfolded working state is located outside the central working unit 2 by the rotation of 180 degrees, and the unfolded working state is releasably locked by the unfolding lock means 5. In addition, each extension work part 3 is in a non-folding state in which the extension work part 3 is positioned above the central work part 2 by a predetermined angle in the other direction (folding direction) opposite to one direction (folding direction), for example, approximately 180 degrees. The folding lock means (not shown) is releasably locked in this folding non-working state.

  Note that the rotation angle of the extension work unit 3 when the state of the extension work unit 3 is switched may be, for example, 150 degrees or 90 degrees. Further, the deployment lock means 5 is constituted by, for example, a lock pin 6 and a hook 7 engaged with the lock pin 6.

  The central working unit 2 is a central body 11 that is a longitudinally long body connected to the three-point link part at the rear of the tractor, and is provided rotatably on the central body 11 and receives power from the tractor side and rotates. The central cultivating body 12 which is a cultivating body while performing the cultivating work, and the rear end portion of the cultivating cover portion 15 of the central airframe 11 are provided so as to be pivotable in the vertical direction around the rotational central axis B in the horizontal direction. And a central leveling body 13 which is a leveling body that performs leveling work behind the body 12.

  The central airframe 11 has a cylindrical frame pipe portion 16 that is longitudinal in the left-right direction, and a gear box portion 17 is provided at the center portion in the left-right direction of the frame pipe portion 16 from the gear box portion 17 to the input shaft 18. Protrudes forward. The input shaft 18 is connected to a PTO shaft (not shown) of the tractor via transmission means (not shown) including a universal joint and a transmission shaft.

  An upper portion of a transmission case portion (for example, a chain case) 19 is attached to the left end portion, which is one longitudinal end portion of the frame pipe portion 16. An upper portion of a plate-like bracket portion 20 that is spaced apart from the transmission case portion 19 is attached to the right end portion that is the other longitudinal end portion of the frame pipe portion 16.

  The central body 11 has a curved plate-shaped tilling cover 15 that covers the upper part of the center tillage body 12, and the upper end of the center leveling body 13 is connected to the rear end of the tilling cover 15 via a hinge or the like. And is pivotally attached.

  The central tilled body 12 has a rotation shaft 21 that is a left and right tillage shaft rotatably supported by a lower portion of the transmission case portion 19 and a lower portion of the bracket portion 20. The rotating shaft 21 rotates by receiving power from a transmission means constituted by a transmission shaft 22 in the frame pipe portion 16, a chain in the transmission case portion 19, and the like. The rotary shaft 21 is attached with a plurality of tilling claws 23 that perform the tilling work while rotating together with the rotary shaft 21.

  The central leveling body 13 is provided at the rear end portion of the tillage cover portion 15 so as to be pivotable in the vertical direction about the rotation center axis B, and is a central leveling member (central leveling plate) that performs leveling work behind the central tillage body 12. ) 25. The center leveling member 25 has a leveling main body plate portion 26 that is longitudinal in the left-right direction, and left and right side plate portions 27 that are vertical planes provided at both left and right ends of the leveling main body plate portion 26.

  As shown in FIG. 4 and the like, an engagement receiving member 30 is attached to each side plate portion 27 of the central leveling member 25 of the central leveling body 13 with a fixture (for example, a bolt and a nut) 28. . That is, the engagement receiving member 30 is fixedly provided on the side surface portion of the central leveling member 25 of the central leveling body 13.

  The extension work unit 3 is provided with an extension machine 31 provided at both ends in the left-right direction of the central machine body 11 of the central work unit 2 so as to be rotatable in the vertical direction about the rotation center axis A, and is rotatable about the extension machine 31 An extension tillage body 32 that is provided with a power supply from the central work section 2 side and rotates while rotating, and a rear end portion of the tillage cover section 35 of the extension machine body 31 about the rotation center axis B in the left-right direction. An extended leveling body 33 that is provided so as to be rotatable in the vertical direction and that performs leveling work behind the extended tillage body 32 is provided.

  The extension body 31 has a cylindrical frame pipe portion 36 that is longitudinal in the left-right direction. An upper portion of a transmission case portion (for example, a chain case) 37 is attached to the left end portion which is one longitudinal end portion of the frame pipe portion 36, and the transmission case portion 37 is attached to the right end portion which is the other longitudinal end portion of the frame pipe portion 36. The upper part of the bracket-like bracket portion 38 is attached.

  Further, the extension machine 31 has a curved plate-shaped tillage cover portion 35 covering the upper portion of the extension tillage body 32, and the upper end portion of the extension leveling body 33 is connected to the rear end portion of the tillage cover portion 35 via a hinge or the like. And is pivotally attached.

  The extended tillage body 32 has a rotating shaft 41 that is a tilling shaft in the left-right direction that is rotatably supported by the lower portion of the transmission case portion 37 and the lower portion of the bracket portion 38. Then, the rotating shaft 41 of the left extended tillage body 32 rotates by receiving power from transmission means constituted by a transmission shaft 42 in the frame pipe portion 36, a chain in the transmission case portion 37, and the like. A one-side clutch 43 is attached to the left end portion of the central transmission shaft 22, and the other-side clutch 44 releasably connected to the one-side clutch 43 is attached to the right end portion of the left transmission shaft 42. Yes. Further, the rotation shaft 41 of the right extension tiller 32 rotates by receiving power from transmission means constituted by a transmission shaft 45 in the frame pipe portion 16, a chain in the transmission case portion 37, and the like. A one-side clutch 46 is attached to the right end portion of the central transmission shaft 45, and the left-side portion of the transmission shaft (not shown) in the transmission case portion 37 is releasably connected to the one-side clutch 46. The other side clutch 47 is attached. In addition, a plurality of tilling claws 48 that perform tilling work while rotating together with the rotating shaft 41 are attached to the left and right rotating shafts 41.

  The extended leveling body 33 is provided at the rear end of the tillage cover portion 35 so as to be rotatable in the vertical direction about the rotation center axis B, and is an extended leveling member (extended leveling plate) that performs leveling work behind the extended tillage body 32. ) 55. The extended leveling member 55 includes a leveling main body plate portion 56 that is longitudinal in the left-right direction, and left and right side plate portions 57 that are vertical planes provided at both left and right ends of the leveling main body plate portion 56.

  As shown in FIG. 5 and FIG. 6 and the like, in the vicinity of the inner end portion (end portion on the central working portion 2 side) on the upper surface of the leveling main body plate portion 56 of the extended leveling member 55, the upper leveling member 55 is directed upward. A protruding plate portion 61 having a protruding vertical surface is fixed. A support plate portion 62, which is a U-shaped support portion, is fixed to the protruding plate portion 61, and the lower surface of the support plate portion 62 is fixed to the upper surface of the leveling main body plate portion 56.

  The support plate portion 62 is composed of a pair of front and rear opposing plates 63 whose front end portions are fixed to the protruding plate portion 61, and a connecting plate 64 that integrally connects the base end portions of both the opposing plates 63. Yes. A plurality of, for example, two circular insertion holes 65 are formed in the connecting plate 64. In addition, a plurality of, for example, two circular insertion holes 66 are formed corresponding to the insertion holes 65 of the connection plate 64 in a portion of the protruding plate portion 61 that is spaced apart from the connection plate 64 of the support plate portion 62. Yes.

  The plate portions 61 and 62 of the extended leveling member 55 of the extended leveling body 33 are movablely engaged with the engagement receiving member 30 of the central leveling body 13 so as to be disengageable when the extension working unit 3 is in the unfolded state. A member (lock bar) 70 is provided so as to be movable in the left-right direction (moving direction shown in the figure), and the movable engaging member 70 is inwardly engaged by a plurality of, for example, two urging members (for example, compression coil springs) 71. Always biased toward the receiving member 30 side.

  Here, as shown in FIGS. 5 to 7, the movable engagement member 70 of the extended leveling body 33 has a U shape in which, for example, a round bar having a circular cross section is bent at a right angle at two locations. . That is, the movable engagement member 70 integrally connects, for example, the opposing rod portion 73 that is a pair of front and rear opposing portions in the form of a left and right round bar that are spaced apart from each other, and the base ends of the opposing rod portions 73. It is comprised by the engagement rod part 74 which is a round bar-shaped engagement part of the front-back direction.

  The opposing rod portion 73 is inserted into the insertion hole 65 of the support plate portion 62 and the insertion hole 66 of the protruding plate portion 61, and is slidable at the peripheral portions of both the insertion holes 65 and 66 of the both plate portions 61 and 62. It is supported. A first pin hole 76 is formed through the top end portion of the opposing rod portion 73 in the vertical direction. A first pin 81 is detachably attached to the first pin hole 76, and the first pin 81 is attached to the first pin hole 76. It is in contact with the first ring 83 such as a washer. A plurality of second pin holes 77 arranged in the left-right direction at equal intervals from each other are formed in the middle portion of the opposing bar portion 73 so as to penetrate vertically. Select from among the plurality of second pin holes 77 A second pin 82 is detachably attached to the one second pin hole 77, and the second pin 82 is in contact with a second ring 84 such as a washer.

  In addition, a coil-like biasing member 71 is disposed on the outer peripheral side of the intermediate portion of the opposing rod portion 73 in a state of being compressed and elastically deformed, and one end portion in the axial direction of the biasing member 71 contacts the protruding plate portion 61. The other end in the axial direction of the urging member 71 is in contact with the second ring 84.

  The magnitude of the urging force of the urging member 71 that urges the movable engagement member 70 via the second ring 84 and the second pin 82 can be adjusted. That is, for example, the magnitude of the urging force of the urging member 71 can be adjusted by changing the second pin hole 77 to which the second pin 82 is attached. For example, although not shown, the biasing force of the biasing member 71 is increased by changing the mounting position of the engagement receiving member 30 with respect to the central leveling member 25 to change the distance between the engagement receiving member 30 and the connecting plate 64. It may be possible to adjust the height.

  The engagement receiving member 30 of the central leveling body 13 includes, for example, a mounting plate part 86 attached to the side plate part 27 of the central leveling member 25 so as to overlap the side plate part 27, and an outer side (extension work) on the mounting plate part 86. For example, there are two pairs of upper and lower (a total of four) engagement receiving projections 87 having a substantially triangular cross section that are integrally provided so as to project toward the portion 3 side and face each other. Then, the engaging rod portion 74 of the movable engaging member 70 of the extended leveling body 33 can enter and exit between the two engaging receiving projections 87 that form a pair in the vertical direction when the extended working portion 3 is in the unfolded state. ing.

  In addition, each of the four engagement receiving projections 87 has a planar engagement receiving surface 88 positioned along the moving direction (left-right direction) of the movable engaging member 70 and the moving direction of the movable engaging member 70. And a planar inclined guide surface 89 inclined at a predetermined angle (for example, approximately 60 degrees) α, and between the engagement receiving surface 88 and the inclined guide surface 89 with respect to the moving direction of the movable engagement member 70. And a planar connecting surface 90 positioned along the orthogonal direction.

  Further, the engagement receiving surface 88 and the communication surface 90 are smoothly continuous via the curved surface 91. A portion of the surface of the mounting plate 86 on the side of the engagement receiving projection 87 facing the space 92 between the two engagement receiving surfaces 88 is a flat contact receiving surface 93. The engagement rod portion 74 engages and contacts 93.

  The inclined guide surface 89 of the upper engagement receiving protrusion 87 is formed in an inclined surface shape that gradually descends toward the protruding direction of the engagement receiving protrusion 87, while the lower engagement receiving protrusion 87. The inclined guide surface 89 is formed in an inclined surface shape that gradually inclines upward in the protruding direction of the engagement receiving projection 87. For this reason, the two inclined guide surfaces 89 that form a pair in the vertical direction are positioned in a substantially C shape.

  Further, as shown in FIG. 7, the distance between the two engagement receiving surfaces 88 that form a pair in the vertical direction is slightly larger than the diameter dimension d of the engagement rod portion 74 having an equal diameter and a circular cross section. Further, the protrusion length dimension (length dimension in the left-right direction) a of the engagement receiving protrusion 87 is larger than the radial dimension r of the engagement bar part 74 and smaller than the diameter dimension d of the engagement bar part 74. For this reason, the engagement rod portion 74 is easy to enter between the two engagement receiving surfaces 88 (between both engagement receiving projections 87), but is difficult to come out.

  When the impact force (external force) is applied to only one of the central leveling body 13 and the extended leveling body 33, the engagement bar portion 74 of the movable engagement member 70 is engaged with the engagement receiving surface 88 and the curved surface. In the form of being sequentially pushed by 91, it comes out of between both engagement receiving surfaces 88 against the urging force of the urging member 71. Further, the pulled out engagement rod portion 74 is guided by the inclined guide surface 89 and then automatically enters between the engagement receiving surfaces 88 by the urging force of the urging member 71.

  It should be noted that a connecting means (locking device) 99 which is an engaging / disengaging means for releasably connecting the central leveling body 13 and the extended leveling body 33 by the engagement receiving member 30, the movable engaging member 70, the biasing member 71 and the like. Is configured.

  As shown in FIGS. 2 and 3, the agricultural working machine 1 includes a rotation drive unit 95 such as a hydraulic cylinder that rotates the extension operation unit 3 in the vertical direction with respect to the central operation unit 2. The rotation drive means 95 includes, for example, a cylinder body 96 and a rod 97 that enters and exits the cylinder body 96.

  Next, the operation and the like of the farm work machine 1 will be described.

  For example, when performing tillage leveling work with the maximum work width, the left and right extension work parts 3 are rotated downward relative to the central work part 2 to switch to the unfolding work state.

  When the extension work part 3 is switched to the unfolding work state, the clutches 43 and 46 of the central work part 2 and the clutches 44 and 47 of the extension work part 3 are connected. Further, the engagement receiving member 30 of the central leveling body 13 of the central working unit 2 and the movable engaging member 70 of the extended leveling body 33 of the extending working unit 3 are engaged with each other, and the central leveling body 13 and the extended leveling body 33 are Is connected to the central body 11 and the extension body 31 so as to be integrally rotatable around the rotation center axis B. That is, the engagement rod portion 74 of the movable engagement member 70 is fitted into the space portion 92 between the two engagement receiving projections 87 of the engagement receiving member 30, that is, between the two engagement receiving surfaces 88, and the contact receiving surface. As a result, the central leveling body 13 and the extended leveling body 33 are automatically connected.

  In this state, when the entire farm work machine 1 is moved forward by the traveling of the tractor, the tilling work is performed by the central tillage body 12 of the center work section 2 and the extension tillage body 32 of the extension work section 3.

  Further, at the rear of the central tillage body 12 and the extended tillage body 32, the central leveling body 13 and the extended leveling body 33 in which the movable engagement member 70 and the engagement receiving member 30 are engaged with each other and connected to each other. Leveling work is performed at

  At the time of such tilling work, only one of the central leveling body 13 and the extended leveling body 33, i.e., for example, the tilling pawl 48 of the extended tilling body 32 is used as an extension leveling member. When a large upward impact force of a predetermined value or more is applied only to the extended leveling body 33 by flying toward 55 or hitting the extended leveling member 55 against a spear or the like, FIG. ), The movable engagement member 70 is sequentially pushed by the engagement receiving surface 88 and the curved surface 91 of the upper engagement receiving projection 87, and the protruding plate resists the urging force of the urging member 71. By sliding and moving with respect to the part 61 and the support plate part 62, the engaging rod part 74 once comes out of the space part 92 between the both engagement receiving surfaces 88.

  That is, the engagement between the movable engaging member 70 and the engagement receiving member 30 is automatically released by the impact force applied to the extended leveling body 33, and the extended leveling body 33 rotates upward with respect to the central leveling body 13. (Up) to release the impact force.

  Thereafter, as shown in FIGS. 8 (f) to (h), the extended leveling body 33 that has been moved upward to release the impact force rotates downward due to its own weight, so that the movable engagement member 70 is engaged on the upper side. The engaging rod portion 74 is pushed by the inclined guide surface 89 of the receiving projection 87 and slides against the urging force of the urging member 71 with respect to the projecting plate portion 61 and the support plate portion 62. It enters the space 92 between the two engagement receiving surfaces 88 and contacts the contact receiving surface 93 to automatically return to the original connected state.

  Similarly, for example, the tilling claws 23 of the central cultivating body 12 fly stones or the like that were in the soil of the field toward the central leveling member 25, and a large upward impact force of a predetermined value or more is applied only to the central leveling body 13. In this case, as shown in FIGS. 9A to 9E, the movable engagement member 70 is sequentially pushed by the engagement receiving surface 88 and the curved surface 91 of the lower engagement receiving projection 87. Then, the engaging rod portion 74 is temporarily removed from the space portion 92 between the both engagement receiving surfaces 88 by slidingly moving with respect to the protruding plate portion 61 and the supporting plate portion 62 against the urging force of the urging member 71. .

  That is, the engagement between the movable engaging member 70 and the engagement receiving member 30 is automatically released by the impact force applied to the central leveling body 13, and the central leveling body 13 rotates upward with respect to the extended leveling body 33. (Up) to release the impact force.

  Thereafter, as shown in FIGS. 9 (f) to 9 (h), the central leveling body 13 that has moved upward and released the impact force is rotated downward by its own weight, so that the movable engagement member 70 is located on the lower side. The engagement rod portion 74 is pushed by the inclined guide surface 89 of the engagement receiving projection 87 and slides against the urging force of the urging member 71 with respect to the protruding plate portion 61 and the support plate portion 62. Enters the space 92 between the two engagement receiving surfaces 88 and contacts the contact receiving surface 93 to automatically return to the original connected state.

  And according to such an agricultural working machine 1, when the impact force based on a comparatively big stone etc. acts on the central leveling body 13 or the extended leveling body 33 in the expansion work state of the extension work part 3, Since the movable engagement member 70 moves against the urging force of the urging member 71 and the engagement between the movable engagement member 70 and the engagement receiving member 30 is released, for example, the central leveling body 13 and the extended leveling body It is possible to prevent problems such as the occurrence of a wide range of steps in the farm scene due to the movement of both 33, thus making it possible to perform appropriate tillage work and preventing damage etc. by releasing the impact force .

  Each of the engagement receiving projections 87 of the engagement receiving member 30 is inclined with respect to the engagement receiving surface 88 positioned along the movement direction of the movable engagement member 70 and the movement direction of the movable engagement member 70. When the impact force is applied to only one of the central leveling body 13 and the extended leveling body 33, the movable engagement member 70 is pushed by the corresponding engagement receiving surface 88. Then, the movable engaging member 70 is moved against the urging force of the urging member 71, so that the movable engaging member 70 again corresponds to the inclined guide surface after the engaging rod portion 74 comes out from between the both engaging receiving projections 87. Since the engagement rod portion 74 enters between the two engagement receiving projections 87 by being pushed at 89 and moving against the urging force of the urging member 71, a more appropriate tillage leveling work is achieved. In addition, it is possible to appropriately prevent damage and the like by releasing the impact force.

  Furthermore, the engagement rod portion 74 of the movable engagement member 70 is in the shape of a round bar, and the projection length dimension a of the engagement reception projection portion 87 of the engagement reception member 30 is greater than the radial dimension r of the engagement rod portion 74. Is larger and smaller than the diameter d of the engagement rod portion 74, the engagement rod portion 74 is easy to enter between the engagement receiving projections 87, but is difficult to come out. A more appropriate tillage work can be performed, and damage can be appropriately prevented by releasing the impact force.

  Further, since it is possible to adjust the magnitude of the urging force of the urging member 71, it is possible to cope with the soil quality of the farm field. For example, the engagement between the movable engagement member 70 and the engagement receiving member 30 is not possible. It is possible to prevent problems that can be easily released.

  In the above embodiment, the configuration has been described in which the central leveling body 13 has the engagement receiving member 30, and the extended leveling body 33 has the movable engagement member 70 and the biasing member 71. For example, the extended leveling body 33 may include the engagement receiving member 30, and the central leveling body 13 may include the movable engagement member 70 and the urging member 71.

  Moreover, the agricultural machine 1 is not limited to a three-split type configuration including the extension work portions 3 on both the left and right sides, and may be configured such that the extension work portion 3 is provided on only one of the left and right sides, for example.

  Further, the engagement receiving member 30 is not limited to the configuration having the upper and lower inclined guide surfaces 89 that are substantially C-shaped. For example, the configuration having only the upper inclined guide surface 89 or the lower inclined guide surface A configuration having only the surface 89 may be used.

  Further, for example, the engagement receiving member 30 may be constituted only by the engagement receiving projection 87, and the engagement receiving projection 87 may be fixed to the side plate portion 27 of the center leveling member 25 by welding or the like.

DESCRIPTION OF SYMBOLS 1 Farming machine 2 Central working part which is working part 3 Extension working part
12 Central cultivated body
13 Central leveling body
30 engagement receiving member
32 Extension tillage
33 Extended leveling body
70 Movable engagement member
71 Biasing member
74 Engagement bar as an engagement part
87 Engagement protrusion
88 engagement surface
89 Inclined guide surface

Claims (5)

A working unit coupled to the traveling vehicle;
An extension working part provided in the working part and selectively switched between the folding non-working state and the unfolding working state;
The working unit is
A plowing body for plowing work,
With a leveling body that performs leveling work behind this tilled body,
The extension working part is:
An extended tillage body for plowing work,
With an extended leveling body that performs leveling work behind this extended tillage body,
Either the leveling body or the extended leveling body has an engagement receiving member,
One of the leveling body and the extended leveling body is:
A movable engagement member that is detachably engaged with the engagement receiving member when the extension working portion is in a deployment work state;
A biasing member that biases the movable engagement member toward the engagement receiving member;
The movable engagement member is moved against the urging force of the urging member and the engagement between the movable engagement member and the engagement receiving member is released when the extension working portion is in the unfolding operation state. Agricultural machine characterized by that. The engagement receiving member has a pair of engagement receiving projections that are spaced apart from each other,
The movable engagement member has an engagement portion that enters and exits between the both engagement receiving projections,
When an impact force is applied to only one of the leveling body and the extended leveling body, the movable engagement member is pushed by the engagement receiving projection and moves against the biasing force of the biasing member. Thus, after the engagement portion has come out from between the both engagement receiving projections, the movable engagement member is pushed again by the engagement receiving projection and resists the biasing force of the biasing member. The farm work machine according to claim 1, wherein the engaging portion enters between the both engaging receiving projections by moving. Each of the engagement receiving projections that engage with the engagement portion is positioned to be inclined with respect to the engagement receiving surface located along the moving direction of the movable engaging member and the moving direction of the movable engaging member. Has an inclined guide surface,
When an impact force is applied to only one of the leveling body and the extended leveling body, the movable engagement member is pushed by the engagement receiving surface and moves against the biasing force of the biasing member. The movable engaging member is pushed again by the inclined guide surface and moves against the urging force of the urging member after the engaging portion has come out from between the both engagement receiving projections. The farm work machine according to claim 2, wherein the engagement portion enters between the two engagement receiving projections. The engaging portion of the movable engaging member is a round bar,
The protrusion length dimension of the engagement receiving protrusion of the engagement receiving member is larger than the radial dimension of the engagement part and smaller than the diameter dimension of the engagement part. Agricultural machine. The agricultural working machine according to any one of claims 1 to 4, wherein the urging force of the urging member can be adjusted.

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