Agricultural work machine

Abstract

To provide an agricultural work machine that enables smooth connection with a traveling body.SOLUTION: An agricultural work machine 1 comprises: a mounting part 4 having a top pin 40 engageable with a traveling body 1; and a plurality of stands 6 that are removably provided on the machine body and capable of supporting the machine body when grounded, wherein the grounding portions of at least two of the stands 6 are equally distanced radially from the top pin 40 in a plan view. Furthermore, the grounding positions of the stands 6 may be arranged asymmetrically about a longitudinal axis passing through the top pin 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an agricultural work machine that is attached to a traveling body and performs grass cutting work by positioning a working unit on the side of the traveling body. [Background technology]

[0002] For example, there is an agricultural work machine described in Patent Document 1. According to this, in order to attach the agricultural work machine to the traveling machine body, the top hook of the quick hitch, which is a coupling device, is used to scoop up the top pin on the agricultural work machine side, and then the lower pin is engaged with the lower engagement part 32 of the quick hitch to complete the connection with the traveling machine body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-034405 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the top pin is lifted up by the top hook on the coupling device, the casters of the stand located at the rear of the agricultural work machine touch the ground, and the rear part of the agricultural work machine moves relatively toward the running machine body. At this time, due to the frictional resistance between the ground load of the casters and the ground on which they touch, the mating angle may not necessarily be ideal in a plan view. In other words, after the top pin engages, the angle of the agricultural work machine relative to the running machine body may not be appropriate, and the top pin, lower pin, and input shaft may not all be easily attached. Therefore, it can be said that there is room for improvement in order to achieve an ideal mating angle between the running machine body including the coupling device and the agricultural work machine when coupled.

[0005] The present invention has been made in light of the above-mentioned problems, and has an object to provide an agricultural work machine that can be smoothly connected to a traveling body. [Means for solving the problem]

[0006] One aspect of the present invention to achieve the object is an agricultural working machine that includes an attachment section having a top pin that can engage with the running body, and a number of stands that are detachably attached to the body and can support the body by touching it, wherein the grounding portions of at least two of the stands have equal radial distances from the top pin when viewed in a plane. Effect of the Invention

[0007] According to the present invention, it is possible to provide an agricultural work machine that can be smoothly coupled to the traveling machine body. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of an agricultural work machine in which the present invention is embodied, the plan view showing the machine in a stored state immediately before a quick hitch is engaged. [Diagram 2] FIG. 1 is a side view of an agricultural work machine in which the present invention is embodied, the side view showing the machine in a stored state immediately before a quick hitch is engaged. [Diagram 3] FIG. 1 is a front view of an agricultural machine embodying the present invention, showing the machine in a stored state. [Figure 4] FIG. 1 is a front view of a working unit of an agricultural work machine embodying the present invention, as viewed from the direction of a rotation axis, with the working unit in a horizontal state. [Diagram 5] 1 is a side view showing a main part of a working unit of an agricultural working machine embodying the present invention, with the stand removed. [Figure 6] FIG. 2 is a rear view showing a main part on the left side in the traveling direction of a working unit of an agricultural working machine in which the present invention is embodied. [Figure 7] FIG. 2 is a bottom view showing a main part on the left side in the traveling direction of a working unit of an agricultural working machine embodying the present invention. [Figure 8] FIG. 2 is an explanatory diagram showing an exploded view of the attachment state of the ground contact part of the working unit of the agricultural work machine according to the present invention. [Figure 9]FIG. 1 is a side view of an agricultural work machine in which the present invention is embodied, showing a state in which the top hook of the quick hitch is used to scoop up the top pin in a stored state. [Figure 10] FIG. 1 is a plan view of an agricultural work machine in which the present invention is embodied, in which the working unit is offset to the side in the traveling direction after engagement with the quick hitch. [Figure 11] FIG. 2 is a front view of a working unit of an agricultural work machine embodying the present invention, as viewed from the direction of the rotation axis, showing the working unit in an inclined state. [Figure 12] FIG. 2 is a perspective view of the quick hitch as seen from the rear side in the travel direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described based on the drawings of Figs. 1 to 12. In Figs. 1, 2, 5, 9, and 10, the left side, which is the traveling body 1 side, will be described as the forward side in the traveling direction, and the right side as the rear side. In Figs. 3, 4, and 11, the forward side in the traveling direction is the near side, and in Fig. 6, the forward side in the traveling direction is the back side of the page. In addition, unless otherwise specified in the description, the upward direction refers to the direction away from the ground side, which is the work surface, and the downward direction refers to the direction approaching the ground side along the direction of gravity. In the description of the drawings, the same or similar parts may be given the same or similar symbols, and their description may be omitted. In addition, the drawings used in the description are schematic, and the dimensions and shapes of each part may differ from the actual ones. In addition, the technical idea of ​​the present invention may be variously modified within the technical scope defined by the claims described in the claims.

[0010] The illustrated agricultural work machine 2 is a grass cutting machine in which the working unit 50 can be offset left and right in the traveling direction and can be rotated up and down, and this form will be used for the explanation. The agricultural work machine 2 is attached to a three-point link mechanism provided at the rear of a traveling body 1 such as a tractor via a quick hitch 3, which is a connecting device. The cutting blade 53 provided on the working unit 50 located at the rear of the agricultural work machine 2 is rotated around a horizontal shaft 52 by power from the traveling body 1 and is used for grass cutting work. The working unit 50 is provided so as to be movable left and right relative to the traveling body 1, and can be positioned on one side of the rear of the traveling body 1 for work. The working unit 50 is provided so as to be rotatable up and down around a pivot shaft 25, which is an axis parallel to the traveling direction, as a fulcrum, and can perform grass cutting work on a slope where the side of the traveling body 1 is inclined.

[0011] The agricultural work machine 2 has a mounting part 4 on the front side, which is a frame for connection to a quick hitch 3 attached to the three-point linkage mechanism of the traveling body 1. The mounting part 4 is a frame-like member that is triangular when viewed from the front, and has an input shaft 45 in the center that receives rotational power from the PTO shaft 12 of the traveling body 1 via a drive shaft 13. In addition, a working unit 50 is provided behind the mounting part 4. Furthermore, an offset mechanism part 20 is provided between the mounting part 4 and the working unit 50 of the agricultural work machine 2.

[0012] A front frame 21 for connection to the mounting unit 4 is provided at the front end of the offset mechanism unit 20. An elongated offset frame 22 that is long in the front-rear direction toward the working unit 50 is provided on the front frame 21 so as to be rotatable in the horizontal direction by a vertical shaft 24a provided on the front frame 21. Two offset frames 22 are provided on the front frame 21, spaced apart from each other on the left and right, and each is rotatably connected to the front frame 21.

[0013] The rear frame 23 is connected to the rear ends of the two offset frames 22 by vertical shafts 24b. The offset frames 22 are connected to the rear frame 23 so as to be freely rotatable horizontally in the left-right direction. In the plan view shown in FIG. 1, the offset mechanism 20 forms a parallel link. A working unit 50 is connected to the rear side of the rear frame 23. The working unit 50 can be moved left and right in the traveling direction relative to the mounting unit 4 by the offset mechanism 20.

[0014] The mounting unit 4 is configured as a substantially triangular frame in a front view, and the front frame 21 is attached to one side of the side where the working unit 50 is moved laterally. In the embodiment, the front frame 21 is provided on the right side of the mounting unit 4 in the traveling direction, but it may be provided on the left side of the mounting unit 4 in the traveling direction depending on the direction in which the working unit 50 is offset. In addition, the upper side of the front frame 21 is connected to the mounting unit 4 by a floating shaft 21a, which is a horizontal shaft in the left-right direction. The mounting unit 4 and the offset mechanism unit 20 are configured to be rotatable relative to each other. That is, the offset mechanism unit 20 and the working unit 50 can rotate up and down with the floating shaft 21a as a fulcrum with respect to the mounting unit 4 attached to the traveling machine body 1 side. As a result, the working unit 50 can follow the undulations of the work surface on which it is grounded.

[0015] Even if the working unit 50 is moved left or right by the offset mechanism 20, the orientation of the working unit 50 relative to the traveling direction is always the same. In other words, the horizontal axis 52, which is the rotation axis of the cutting blade 53, always maintains a direction perpendicular to the traveling direction. In this way, the agricultural work machine 2, when attached to the traveling body 1, can move the working unit 50 within a range from the stored position shown in FIG. 1 to the maximum offset position shown in FIG. 10. The worker can offset the working unit 50 to any position to perform work. Note that FIG. 1 shows a state in which the stand 6 is attached to the body of the agricultural work machine 2, and FIG. 10 shows a state in which the stand 6 is removed from the body of the agricultural work machine 2.

[0016] The working unit 50 includes a horizontal shaft 52, a cover 51, a drive shaft 55, a speed change unit 54, and a transmission unit 59. The working unit 50 has a horizontal shaft 52 that is perpendicular to the traveling direction of the traveling body 1 and has a plurality of cutting blades 53 arranged radially so as to be freely swingable. The cutting blades 53 are rotated to cut and crush objects such as weeds. The horizontal shaft 52 is a rotating shaft arranged to the left and right of the traveling direction, and has a plurality of cutting blades 53 arranged at intervals in the circumferential direction and the axial direction. The plurality of cutting blades 53 and the horizontal shaft 52 are sometimes collectively referred to as a cutting blade unit. The rotational power of the cutting blades 53 is transmitted from the traveling body 1 to the speed change unit 54 provided on the side of the working unit 50 via the input shaft 45 and the drive shaft 55 provided on the mounting unit 4, and the cutting blades 53 are driven by the power transmitted from the traveling body 1 to the speed change unit 54 provided on the side of the working unit 50. The cutting blades 53, which have acquired the power from the input shaft 45, rotate to perform the work of cutting vegetation on the work surface, which is a ground work.

[0017] The cover 51 is also called a cover body, and covers the upper side including the front and rear of the rotation area of ​​the cutting blade 53, and the left and right side parts. The cover 51 covers the upper part of the outer periphery of the rotation path of the cutting blade 53 to prevent the cut weeds, etc. from scattering. The cover 51 supports the horizontal shaft 52 with side plates 51a, 51b arranged on the sides, and covers the sides of the outer periphery of the rotation path of the cutting blade 53 to prevent the cut weeds, etc. from scattering. The side plate 51a arranged on the left side of the travel direction of the cover 51 has a transmission unit 59 and a speed change unit 54 arranged thereon. The speed change unit 54 is arranged further to the left of the transmission unit 59 in the travel direction. The drive shaft 55 is a shaft that transmits the rotational power obtained from the input shaft 45 to the speed change unit 54. The rotational power obtained from the drive shaft 55 is changed in speed by the speed change unit 54 and the transmission unit 59 and transmitted to the horizontal shaft 52.

[0018] Furthermore, the working unit 50 is provided with a ground contact portion 8. The ground contact portion 8 includes a gauge roller 80 and a skid 84, and these members come into contact with the ground to determine the height of the working surface and the cutting blade 53 above the ground and to support the working unit 50.

[0019] The gauge roller 80 is a roller body and is provided at the rear of the cover 51. The gauge roller 80 is a cylindrical member with a length approximately equal to the left-right width of the cover 51 in the traveling direction. The gauge roller 80 contacts the work surface and rolls as the cover 51 travels, thereby maintaining the position of the cutting blade 53 at a height above the ground. The gauge roller 80 is rotatable at the rear of brackets 81a, 81b arranged along the sides of the side plates 51a, 51b. The bracket 81a is attached to the left side plate 51a of the cover 51, and the bracket 81b is attached to the right side plate 51b of the cover 51.

[0020] The gauge roller 80 located at the rear of the brackets 81a, 81b is rotatable by a rotary shaft 82 located in front of the brackets 81a, 81b, and moves up and down relative to the cutting blade 53. The height of the gauge roller 80 is adjusted around a rotating shaft 82 located forward of the rotation shaft of the gauge roller 80. Therefore, the front end of the bracket 81a can be positioned above the lower end of the gauge roller 80, and the front end of the bracket 81a will not stick into the ground.

[0021] The height adjustment of the gauge roller 80, which is a roller body, is performed around the pivot shaft 82 located forward of the rotation area of ​​the cutting blade 53. Therefore, when the bracket 81a also moves up and down with the height adjustment of the gauge roller 80, the bracket 81a can cover the side of the rotation area of ​​the cutting blade 53. In other words, the bracket 81a can prevent scattering from the cutting blade 53. Then, when the gauge roller 80 is in a grounded state, the cutting height can be adjusted by changing the lower end position of the rotation area of ​​the cutting blade 53 relative to the work surface. In the embodiment, the pivot shaft 82 is composed of a bolt and a nut, and by fastening these, the side plates 1a, 51b and the brackets 81a, 81b can rotate and be fixed at the same time. Once the height of the gauge roller 80 is determined, the position is fixed relative to the side plates 51a, 51b by fixing the rear fixing member 83.

[0022] A fixing member 83 is provided behind the brackets 81a and 81b and near the gauge roller 80. The brackets 81a and 81b and the side plates 1a and 51b are further fixed with the fixing member 83, so that the brackets 81a and 81b are fixed integrally with the side plates 51a and 51b, and the height of the gauge roller 80 can be stably maintained. In the embodiment, the fixing member 83 is made of a bolt and a nut, and is provided in two places behind the brackets 81a and 81b. The fixing member 83 is fixed to the brackets 81a and 81b by selecting a plurality of holes 83b provided in the brackets 81a and 81b and passing through the holes provided in the side plates 51a and 51b and fastening it. The mowing height of the gauge roller 80 can be adjusted in stages.

[0023] The case of adjusting the height of the gauge roller 80 will be described. By releasing the fixation of the pivot shaft 82 and removing the fixing member 83, the brackets 81a, 81b become rotatable. When the gauge roller 80 is at the desired height, the fixing member 83 is inserted through the holes 83b in the brackets 81a, 81b and the holes in the side plates 51a, 51b. Then, the pivot shaft 82 and the fixing member 83 are fastened together to fix the height of the gauge roller 80. The height of the gauge roller 80 is adjusted below the pivot shaft 82.

[0024] Skids 84a and 84b are ground-contacting members and are attached to brackets 81a and 81b. Skid 84a is attached to bracket 81a, and skid 84b is attached to bracket 81b. Skid 84a and skid 84b are symmetrical to each other, so skid 84a will be used for the detailed description and a detailed description of skid 84b will be omitted.

[0025] The skid 84a, which is a grounding member, has an attachment surface 84a1, a first grounding portion 84a2, and a second grounding portion 84a3. The attachment surface 84a1 is a plate-shaped member attached to the bracket 81a, and is fixed to the bracket 81a by the rotating shaft 82 and a fixing member 84a4. In the embodiment, the fixing member 84a4 is composed of a bolt and a nut, and is provided at two places between the rotating shaft 82 and the gauge roller 80. The skid 84a can be fixed to the bracket 81a by aligning the attachment surface 84a1 with the bracket 81a and fixing the rotating shaft 82 again with the fixing member 84a4 in a state where the fixing of the rotating shaft 82 is released. Conversely, the skid 84a can be removed from the bracket 81a by releasing the fixing of the rotating shaft 82 and removing the fixing member 84a4. In other words, the skids 84a and 84b are configured to be freely attached and detached to the bracket 81a. In other words, the skids 84a, 84b are configured to be detachable from the gauge roller 80. Fig. 8 is a diagram clearly showing the manner in which the skids 84a, 84b are attached to the gauge roller 80.

[0026] The gauge roller 80 moves up and down around the pivot shaft 82. Therefore, by attaching the mounting surface 84a1 to the bracket 81a, the mounting surface 84a1 also moves up and down together with the gauge roller 80 around the pivot shaft 82. As shown in FIG. 5, the skids 84a and 84b are configured to be able to move up and down together with the gauge roller 80, and the skids 84a and the gauge roller 80 can be adjusted in stages to the positions shown by the two-dot chain lines. In addition, the mounting surface 84a1 also moves up and down together with the bracket 81a, so that the bracket 81a can be reinforced and the cutting blade 53 can be prevented from scattering. The skids 84a and 84b rotate up and down around the pivot shaft 82 located at the front of the gauge roller 80, so that the vertical position can be adjusted by only supporting the gauge roller 80 located at the rear end.

[0027] The first grounding portion 84a2 is arranged and fixed so as to intersect with the mounting surface 84a1. In the embodiment, the first grounding portion 84a2 is provided so as to be perpendicular to the mounting surface 84a1. The first grounding portion 84a2 is provided so as to incline upward toward the front from the middle portion to the front end in the forward and backward directions of travel, and the portion of the first grounding portion 84a2 extending from the middle portion to the rear is a sled-shaped member provided parallel to the work surface. During work, the lower surface of the first grounding portion 84a2 extending from the middle portion to the rear is in contact with the ground almost entirely, and supports the working unit 50 while sliding against the ground. The first grounding portion 84a2 prevents the weight of the working unit 50 from being directly applied to the surface. In other words, the skids 84a, 84b support the working unit 50 while distributing its own weight with the first grounding portion 84a2 that contacts the work surface, so that the working unit 50 can be prevented from sinking into the work surface.

[0028] Furthermore, the first ground contact portion 84a2 can support the working unit 50 while distributing its own weight together with the gauge roller 80. The skids 84a and 84b cooperate with the gauge roller 80 to further prevent the working unit 50 from sinking into the ground, compared to when only the gauge roller 80 is in contact with the ground.

[0029] As shown in Fig. 6, the second grounding portion 84a3 is formed continuously with the first grounding portion 84a2. The second grounding portion 84a3 is provided continuously with the end of the first grounding portion 84a2 on the opposite side to the mounting surface 84a1, and has a surface that slopes upward as it moves away from the first grounding portion 84a2 to the side surface of the cover. Specifically, the second grounding portion 84a3 slopes upward as it moves away from the side plate 51a to the left in the traveling direction.

[0030] Similarly to the first ground contact portion 84a2, the second ground contact portion 84a3 is provided so as to be inclined upward toward the front from the middle portion toward the front end in the forward / rearward direction of travel. During normal forward travel work, the portion from the middle portion of the second ground contact portion 84a3 toward the rear, which is the side of the first ground contact portion 84a2, comes into contact with the ground.

[0031] The relationship between the turning operation and the second grounding portion 84a3 will be explained. When the working unit 50 performs a turning operation in which it turns together with the traveling machine body 1, the working unit 50 located at the rear of the traveling machine body 1 slides relative to the work surface in the left and right width direction with respect to the direction of travel. At this time, the side plates 51a, 51b or the brackets 81a, 81b, or both, push the soil on the work surface toward the front of the sliding movement side. In other words, soil is piled up on the sides of the side plates 51a, 51b or the brackets 81a, 81b. The second grounding portion 84a3 makes it easy to get over the piled up soil. The second grounding portion 84a3, which has an upwardly inclined surface formed continuously from the first grounding portion 84a2, makes it easy to get over the piled up soil that may occur during the turning operation. Even if there is a piled up on the side, it is difficult to hinder the turning progress, and the load on the agricultural work machine 2 due to the piled up soil can be reduced.

[0032] With the above-mentioned configuration, the skids 84a, 84b, which are grounding members of the grounding portion 8, can be attached and detached to the gauge roller 80, which is a roller body. When the working surface is hard ground where soil accumulation due to turning is unlikely to occur, it is possible to remove only the skids 84a, 84b and ground only the gauge roller 80. Since the agricultural working machine 2, which is an offset working machine, has the working section 50 located at the rear, the grounding load of the front wheels of the traveling machine body 1 can be increased by removing the skids 84a, 84b arranged on the working section 50. In other words, the grounding load of the front wheels that perform steering can be increased, so the running stability of the traveling machine body 1 can be improved. If soil accumulation is a concern, the skids 84a, 84b can be attached to the gauge roller 80 again to enable work. Of course, even if there is no risk of soil accumulation, the skids 84a, 84b can be attached and work can be performed.

[0033] During operation, the skids 84a, 84b move forward while touching and sliding against the ground. This can cause wear and impair the function of the skids 84a, 84b. Because the skids 84a, 84b are detachable from the gauge roller 80, it is possible to replace only the skids 84a, 84b that may be worn. Therefore, the operator does not need to separately prepare not only the skids 84a, 84b but also the brackets 81a, 81b and the gauge roller 80, and therefore it is possible to continue using the agricultural work machine 2 economically and inexpensively.

[0034] In addition, since the skids 84a, 84b are attached to the brackets 81a, 81b, the height can be adjusted integrally with the gauge roller 80. In other words, since there is no need to adjust the heights of the skids 84a, 84b and the gauge roller 80 individually, it is easy for the worker to use and handle.

[0035] In the embodiment, the tilting skid 85 is also attached to the side near the speed change unit 54. FIG. 11 is a diagram showing the working unit 50 rotating around the pivot shaft 25, and the working unit 50 shown in solid line shows a state in which the right end side of the working unit 50 has rotated upward relative to the rear frame 23 around the pivot shaft 25. The working unit 50 shown in two-dot chain line in FIG. 11 shows a state in which the right end side of the working unit 50 has rotated downward relative to the rear frame 23 around the pivot shaft 25. Since the working unit 50 can rotate around the pivot shaft 25, as shown by the solid line in FIG. 11, depending on the rotation position of the working unit 50, the speed change unit 54 may be close to the working surface or the traveling surface. In this case, the tilting skid 85 is provided so as to be located below the speed change unit 54, and the rear end of the tilting skid 85 is provided so as to reach the rear end of the speed change unit 50 in a side view. Even if the transmission unit 50 comes close to the ground due to the inclination of the working unit 50, the tilt skid 85 protects the transmission unit 54 and prevents damage.

[0036] The tilting skid 85 can contact the ground located below when the right end of the working unit 50 is lifted upward for lifting and tilting. The front end of the tilting skid 85 is inclined so as to move away from the ground as the working unit 50 moves forward for lifting and tilting. Therefore, even when the tilting skid 85 is in contact with the ground, it can slide smoothly on the ground without getting caught on the ground, so that the friction load caused by contact with the ground on the agricultural work machine 2 can be reduced. Note that the inclined portion in the embodiment adopts a curved shape. The front end of the tilting skid 85 is located below the rear end of the drive shaft 55. Therefore, the tilting skid 85 can also prevent damage to the drive shaft 55 due to contact with the ground.

[0037] A cylinder 26 that is hydraulically or electrically operated to extend and retract is provided between the front frame 21 and one of the offset frames 22. By extending and retracting the cylinder 26, the rear end side of the offset frame 22 can be moved left and right. In other words, the left and right movement of the working unit 50 is performed by extending and retracting the cylinder 26. The working unit 50 can be placed at any position between the stored position and the offset position, which moves to the side. FIG. 1 shows the stored position where the working unit 50 is located behind the mounting unit 4, and FIG. 10 shows the state where the working unit 50 is located at the offset position. Since the working unit 50 at the offset position can be protruded to the side from the traveling body 1, it is possible to perform grass cutting work in places where the traveling body 1 cannot travel.

[0038] The working unit 50 is connected to the rear frame 23 by a pivot shaft 25 parallel to the traveling direction so as to be rotatable in the vertical direction. A cylinder 27 is provided so as to bridge the working unit 50 and the rear frame 23, and the working unit 50 can be rotated around the pivot shaft 25 as a fulcrum by the extension and contraction of the cylinder 27. In the embodiment, the pivot shaft 25 is located at the left end of the front side of the working unit 50, and the right end of the working unit 50 is configured to rotate up and down around the pivot shaft 25 as a fulcrum. The cylinders 26, 27 are not limited to a drive method for extension and contraction such as hydraulic or electric. The cylinders 26, 27 in the embodiment will be described as being configured to be capable of extension and contraction drive by receiving hydraulic pressure from a hydraulic pressure generating source possessed by the traveling machine body 1. In the embodiment, the cylinder 27 is located at the front of the cover 51, the bottom side is located at the middle part of the cover 51 with respect to the left and right, and the rod side is located at the top of the pivot shaft 25. The working unit 50 shown in Fig. 4 is in a horizontal position relative to the rear frame 23, while the working unit 50 shown in Fig. 11 is in an inclined state where it has been rotated up and down about the pivot shaft 25. The pivot shaft 25 may be disposed outside the side plate 51a, rather than on the top of the cover 51. Figs. 4 and 11 show a state in which the stand 6 has been removed from the body of the agricultural work machine 2.

[0039] A stopper 28 is provided in front of the cylinder 27. The stopper 28 is a long plate-like member that is provided parallel to the longitudinal direction of the cylinder 27. One end of the stopper 28 is fixed to the cover 51, and the other end has a long hole 28a. The long hole 28a is located almost at the top of the rotating shaft 25. A fixing pin 28b can be inserted into the long hole 28a.

[0040] The fixed pin 28b can be arranged between the restriction holes 29 provided on the upper part of the rear frame 23, and the stopper 28 is located between the restriction holes 29. The fixed pin 28b is inserted into the long hole 28a while being extended through the restriction holes 29 to restrict the extension and contraction of the cylinder 27. In the embodiment, when the fixed pin 28b is inserted into the long hole 28a, the working unit 50 is restricted from tilting so as to maintain a horizontal state without being tilted with respect to the rear frame 23. In other words, the working unit 50 is unable to rotate around the pivot shaft 25. The long hole 28a may be a perfect circle. By providing the long hole 28a with a large diameter that allows a margin for the fixed pin 28b, it is possible to insert the fixed pin 28b without strictly adjusting the extension and contraction of the cylinder 27. The working unit 50, whose tilt restriction has been released, can rotate together with the stopper 28. Furthermore, as shown in FIG. 11, by inserting a fixing pin 28b into another restriction hole 29a and an elongated hole 28a, the inclination of the working unit 50 can be restricted in an inclined state.

[0041] The stands 6 include a first stand 61 and a second stand 64 which are rear stands, and a third stand 67 which is a front stand. Note that a state of the agricultural work machine 2 in which the working unit 50 is in a stored position located behind the mounting unit 4 and all of the first stand 61, the second stand 64, and the third stand 67 are on the ground is referred to as a storage state. Also, the agricultural work machine 2 is attached to the traveling body 1 when in the stored state with the stands 6 attached.

[0042] The first stand 61 and the second stand 64, which are the rear stands, are columnar elongated members whose long lengths are oriented in the vertical direction, and are detachably attached using a first attachment part 63 and a second attachment part 66 fixed to the cover 51. The first attachment part 63 is fixed laterally and rearwardly to the front part of the front part of the side plate 51a, and the second attachment part 66 is fixed to the front right end part of the cover 51. The first stand 61 is detachably attached to the first attachment part 63, and the second stand 64 is detachably attached to the second attachment part 66. The second attachment part 66 may be fixed to the front side of the side plate 51b.

[0043] The first mounting portion 63 and the second mounting portion 66 are each formed in a cylindrical shape. In the embodiment, the first mounting portion 63 and the second mounting portion 66 are arranged so that the cylindrical portion faces the vertical direction. The upper ends of the first stand 61 and the second stand 64 are fitted into the insides of the first mounting portion 63 and the second mounting portion 66 from below. The first stand 61 can be fixed to the first stand 61 by penetrating a pin-shaped fixing member 71 into the first mounting portion 63, and can be released from the first mounting portion 63 and the first stand 61 by pulling out the fixing member 71. Similarly to the first stand 61, the second stand 64 can be fixed to the second mounting portion 66 by penetrating a pin-shaped fixing member 71 into the second mounting portion 66, and can be released from the second mounting portion 66 and the second stand 64 by pulling out the fixing member 71. The first stand 61 and the second stand 64 are provided so as to be detachable from the agricultural work machine 2.

[0044] Furthermore, when attaching the stand 6 to the agricultural work machine 2, the working unit 50 is adjusted to a storage position located behind the mounting unit 4 and to a horizontal position by using the cylinders 26, 27. The cylinders 26, 27 extend and retract only when an operator operates an operating unit (not shown). A control device may be incorporated so that the working unit 50 automatically assumes a position where the stand 6 can be attached, such as a storage position or a horizontal position.

[0045] A first caster 62 is provided at the lower end of the first stand 61, and a second caster 65 is provided at the lower end of the second stand 64. The first caster 62 and the second caster 65 are wheels that touch the ground and roll to enable the agricultural work machine 2 to move. The first caster 62 touches the ground at a first grounding point 62a, and the second caster 65 touches the ground at a second grounding point 65a, thereby supporting the working unit 50 when the first stand 61 and the second stand 64 are attached to the agricultural work machine 2. Note that the first stand 61 and the second stand 64 in the stored state are inclined forward so that the upper part is inclined forward relative to the lower part. The first stand 61 supports the working unit 50 at the first grounding point 62a, and the second stand 64 supports the working unit 50 at the second grounding point 65a.

[0046] The third stand 67, which is the front stand, is a columnar elongated member that is long in the vertical direction. The third stand 67 is provided at the rear of the mounting unit 4, at the other end symmetrical to the front frame. In this embodiment, it is disposed at the rear of the mounting unit 4 on the left side in the traveling direction. The upper part of the elongated member in the vertical direction of the third stand 67 is detachably provided on the third attachment part 70 fixed to the offset frame 22.

[0047] The third mounting portion 70 is formed in a cylindrical shape. In this embodiment, the third mounting portion 70 has a cylindrical shape with a rectangular cross section, and is arranged so that the cylindrical direction faces the vertical direction. The upper end of the third stand 67 is fitted into the inside of the third mounting portion 70 from below. The third stand 67 can be fixed to the third mounting portion 70 by penetrating a pin-shaped fixing member 71 into the third mounting portion 70, and the third mounting portion 70 can be released from the third stand 67 by pulling out the fixing member 71. The third stand 61 is attachable to and detachable from the agricultural work machine 2.

[0048] A third caster 68 is provided at the lower end of the third stand 67. The third caster 68 is grounded on the ground at a third ground contact point 68a. The third caster 68 is a wheel, and makes it possible to move the agricultural work machine 2 by contacting the ground and rolling. The third stand 67 supports the offset mechanism unit 20 and the mounting unit 4 of the agricultural work machine 2 in a stored state at the third ground contact point 68a. The third caster 68 used in this embodiment is of a type that can rotate horizontally.

[0049] The positional relationship between the first ground point 62a, the second ground point 65a, and the third ground point 68a will be described. The first ground point 62a in a plan view in the stored state is disposed at a position offset to the left in the traveling direction when the pivot shaft 25 that rotates the working unit 50 up and down is used as a reference. The first ground point 62a in this embodiment is disposed below the side plate 51a and the transmission unit 56.

[0050] The second grounding point 65a in the plan view in the stored state is disposed at a position offset to the right in the traveling direction with respect to the pivot shaft 25 that vertically rotates the working unit 50. In the embodiment, the first grounding point 65a is disposed below the side plate 51b.

[0051] The third caster 68 in the stored state as viewed from above is disposed at a position offset to the left in the traveling direction when the pivot shaft 25 that rotates the working unit 50 up and down is used as a reference. The third caster 68 in this embodiment is located forward of the first caster 62 in the traveling direction and below the left end of the mounting unit 4. In the plan view, the third ground contact point 68a is disposed at approximately the same position as the third caster 68.

[0052] When viewed from the front in the stored state, the working unit 50 is supported by the first grounding point 62a and the second grounding point 65a below the side plates 51a and 51b at both the left and right ends in the traveling direction of the working unit 50, and is therefore prevented from rotating left and right around the traveling direction as an axis. In contrast, the offset mechanism unit 20 and the mounting unit 4 attempt to rotate clockwise relative to the working unit 50 by their own weight, with the rotating shaft 25 as the fulcrum. However, since the cylinder is not operated, they do not expand or contract and maintain their current positions. Therefore, a stable storage state can be maintained by simply having the first stand 61, the second stand 64 and the third stand 67 touch the ground.

[0053] The positional relationship of the first grounding point 62a, the second grounding point 65a, and the third grounding point 68a with respect to the center of gravity G of the agricultural work machine 2 will be described. The center of gravity G in the stored state in a plan view is located in front of the left-right middle part of the cover and to the side of the rear frame 23 of the offset mechanism unit 20. The center of gravity G is located behind the front frame 21. The center of gravity G is also located closer to the left-right middle part of the cover 51 than the rotating shaft 25. It can also be said that the center of gravity G is located in a position offset to one side in the left-right direction of travel with respect to the top pin 40 of the mounting unit 4. It can also be said that the center of gravity G is located in a position offset to one side in the left-right direction of travel with respect to the input shaft 45 of the mounting unit 4.

[0054] The ground contact positions of the stands 6 are arranged at positions asymmetrical with respect to the front-rear axis passing through the top pin as the center. Also, the ground contact positions of the stands 6 are arranged so that the front-rear positions with respect to the traveling direction are different from each other.

[0055] In a storage state in a plan view, the first grounding point 62a, the second grounding point 65a, and the third grounding point 68a are arranged at approximately equal intervals from each other so as to surround the center of gravity G, and are further arranged at approximately the same distance from the center of gravity G. In the plan view shown in FIG. 1, the straight line connecting the center of gravity G and the first grounding point 62a is distance L1, the straight line connecting the center of gravity G and the second grounding point 65a is distance L2, and the straight line connecting the center of gravity G and the third grounding point 68a is distance L3. The distance L1 between the center of gravity G and the first grounding point 62a, the distance L2 between the center of gravity G and the second grounding point 65a, and the distance L3 between the center of gravity G and the third grounding point 68a are approximately equal. When the distance L1, the distance L2, or the distance L3 is set as a radius from the center of gravity G, the first grounding point 62a, the second grounding point 65a, and the third grounding point 68a are arranged at equal intervals in the circumferential direction around the center of gravity G. As described above, by setting the number of ground contact points of the stand to three, which is an odd number and the minimum number, at an appropriate ground contact position with respect to the center of gravity G, it is possible to stably ground the agricultural work machine 2 in a stored state.

[0056] Moreover, the third ground point 68a is different from the first ground point 62a and the second ground point 65a, and is arranged in a different location from the working unit 50 which has an integral structure. The third ground point 68a is arranged via the pivot shaft 25, the offset mechanism unit 20, and the floating shaft 21a, which are movable parts arranged between the working unit 50 and the mounting unit 4. Even with the arrangement structure of the first stand 61, the second stand 64, and the third stand 67 described above, the agricultural work machine 2 can be maintained in a stable storage state due to the respective positional relationships between the center of gravity G, the first ground point 62a, the second ground point 65a, and the third ground point 68a.

[0057] The agricultural work machine 2 is separated from the hydraulic power source (not shown) and placed in a storage state. Therefore, the cylinders 26 and 27 are placed in a storage state while maintaining their current extended and retracted positions. However, there are cases where the extended and retracted positions cannot be maintained due to damage or wear. In this case, the offset mechanism unit 20 cannot rotate around the rotation axis relative to the working unit 50 by restricting the inclination of the cylinder 27 with the stopper 28. In other words, even if the function of the cylinder 27 is impaired, the first ground point 62a, the second ground point 65a, and the third ground point 68a remain in a grounded state, and the attitude of the agricultural work machine 2 in the storage state can be maintained.

[0058] In addition, the upper portions of the vertical shafts 24a, 24b provided on the offset mechanism part 20 are inclined forward. If the function of the cylinder 26 is impaired, a load is applied to the rotation of the offset frame 22, and the working part 50 cannot easily slide relative to the mounting part 4. Therefore, the stored position is maintained.

[0059] In the embodiment, the first caster 62, the second caster 65, and the third caster 68 are provided so as to be rotatable in the horizontal direction with respect to the first stand 61, the second stand 64, and the third stand 67 to which they are attached. Therefore, the agricultural work machine 2 can move freely when the first caster 62, the second caster 65, and the third caster 68 are in contact with the ground. By configuring in this manner, the agricultural work machine 2 can be easily moved in any direction even during storage. In addition, one or more of the first caster 62, the second caster 65, and the third caster 68 can be made to be unable to rotate in the horizontal direction. In this case, although the direction of movement of the agricultural work machine 2 in the grounded state is limited, the configuration of the first caster 62, the second caster 65, and the third caster 68 can be simplified, and inexpensive first stand 61, second stand 64, and third stand 67 can be provided. Furthermore, the first caster 62, the second caster 65, and the third caster 68 themselves can be omitted. The entire configuration of the stand 6 including the first stand 61, the second stand 64, and the third stand 67 can be further simplified. If the first caster 62 and the second caster 65 are not designed to rotate horizontally and the third caster 68 is designed to rotate horizontally, when the top hook 30 of the quick hitch 3 scoops up the agricultural machine 2 and the third caster 68 is lifted up, the first caster 62 and the second caster 65 cannot rotate horizontally. Therefore, the quick hitch 3 and the agricultural machine 2 can be attached even easier. As described above, the first stand 61, the second stand 64, and the third stand 67 each have a columnar elongated member that is long in the vertical direction. Furthermore, each of the first stand 61, the second stand 64, and the third stand 67 each has one first caster 62, the second caster 65, and the third caster 68 at its lower end. By configuring in this way, it is possible to stably maintain the storage state of the agricultural machine 2 by properly adjusting the positional relationship with the center of gravity while making the stand 6 extremely simple in configuration.

[0060] The quick hitch 3 disposed between the traveling body 1 and the agricultural work machine 2 will be described. The quick hitch 3 is formed of a triangular frame with the apex located upward in the perspective view and rear view of FIG. 12. The quick hitch 3 is provided with a hook-shaped top hook 30 that engages from below a top pin 40 provided on the upper part of the mounting part 4 on the agricultural work machine 2 side, and lower engagement parts 32 that engage lower pins 41, which are connecting pins provided on the left and right below the mounting part 4, on the left and right of the lower part. In addition, between the left and right lower engagement parts 32, one end side of the drive shaft 13 that transmits power from the PTO shaft 12 of the traveling body 1 is supported by a receiving part 35. This receiving part 35 is fitted with the input shaft 45 of the agricultural work machine 2 to transmit the rotational power from the PTO shaft 12.

[0061] The lower engagement part 32 has an opening at the rear, and the lower pins 41 provided on the left and right sides of the mounting part 4 engage with this opening. The opening is provided with a lower hook 31 that prevents the engaged lower pin 41 from coming off, and the lower hook 31 is provided so that it can be switched between a state in which the lower pin 41 is prevented from coming off the lower engagement part 32 and a state in which the prevention is released. In addition, the quick hitch 3 is provided on the traveling body 1 side with a top link pin 33 for mounting to the top link 10 of the three-point link mechanism of the traveling body 1, and a lower link pin 34 for mounting to the lower link 11.

[0062] The top link pin 33 is provided on the front side above the center of the quick hitch 3, and the lower link pins 34 are provided on the left and right sides of the front sides below. The quick hitch 3 is detachably attached to the three-point link mechanism of the traveling body 1, which consists of the top link 10 provided in the upper center and the lower links 11 provided on the lower left and right, and can be raised and lowered by operating the traveling body 1 side.

[0063] To mount the agricultural work machine 2 to the traveling body 1 using the quick hitch 3, the traveling body 1 to which the quick hitch 3 is already attached is moved backward and the three-point link mechanism is raised. The agricultural work machine 2 is in a stored state. First, the top pin 40 of the mounting part 4 is lifted up by the top hook 30 of the quick hitch 3. FIG. 1 shows the state immediately before the top pin 40 is lifted up. When the quick hitch 3 is further lifted, the lower pins 41 provided on the left and right below the mounting part 4 are pulled toward the quick hitch 3 as shown in FIG. 9 and engage with the openings of the lower engagement parts 32 of the quick hitch 3. At the same time, the input shaft 45 also fits into the receiving part 35 provided on the quick hitch 3. After the top pin 40, the lower pin 41, and the input shaft 45 are all engaged, the lower hook 31 that prevents the lower pin 41 from falling off is engaged and fixed, completing the connection. Through the above procedure, the installation is completed without the worker having to directly touch the traveling body 1 and the agricultural work machine 2. Furthermore, the stand 6 is removed to bring the agricultural work machine 2 into a working state where it is ready to work.

[0064] To remove the agricultural work machine 2 from the quick hitch 3, simply reverse the above-mentioned mounting procedure. First, the agricultural work machine 2 in the stored state is raised by the three-point linkage, and then the stand 6 is attached to the agricultural work machine 2, and then the lower hook 31 of the quick hitch 3 is released. After that, the quick hitch 3 is lowered by the three-point linkage of the traveling body 1, and the top pin 40 and the lower pin 41 of the mounting part 4 are easily released from the quick hitch 3.

[0065] Here, the first grounding point 62a, the second grounding point 65a, the third grounding point 68a, and the center of gravity G when attached to the quick hitch 3 will be described in more detail. In the stored state, in a plan view with the top pin 40 as a reference, the second grounding point 65a and the center of gravity G are located on the right side, which is one side with respect to the traveling direction. Also, the first grounding point 62a and the third grounding point 68a are located on the left side, which is the other side with respect to the traveling direction. Furthermore, the first grounding point 62a and the second grounding point 65a are disposed at equal distances from the top pin 40. In addition, as described above, the first grounding point 62a and the second grounding point 65a are disposed at approximately the same distance from the center of gravity G, while being disposed such that the front-rear positions are different from each other.

[0066] When the top hook 30 scoops up the top pin 40, the third caster 68 rises, and the first caster 62 and the second caster 65 behind it are in a grounded state. When the quick hitch 3 is further raised, the working unit 50 is drawn toward the quick hitch 3. At this time, since the first grounding point 62a and the second grounding point 65a are disposed at substantially the same distance from the center of gravity G, the shared loads that are the loads shared by each of them are equal. In other words, since the first caster 62 and the second caster 65 receive the same load, the working unit 50 is drawn toward the quick hitch 3 at the same timing and speed. In other words, since the working unit 50 does not rotate in a state where the top hook 30 scoops up the top pin 40, the lower pin 41 and the input shaft 45 can be engaged with the quick hitch 3 substantially simultaneously without tilting in a plan view.

[0067] Even if the center of gravity G in a plan view is offset to one side of the top pin 40 in the direction of travel, the distance from the center of gravity G to the first ground point 62a and the distance from the center of gravity G to the second ground point 65a are approximately equal. Therefore, after the top hook 30 scoops up the top pin 40, the lower pin 41 and the input shaft 45 are properly fitted together.

[0068] The relationship between the top pin 40, the first grounding point 62a, and the second grounding point 65a will now be described. In a plan view, the distance from the top pin 40 to the first grounding point 62a and the distance from the top pin 40 to the second grounding point 65a are configured to be approximately equal. In a plan view, the first grounding point 62a and the second grounding point 65a are located at a distance R from the top pin 40. It can also be said that the effective shortest distance from the top pin 40 to the first grounding point 62a and the effective shortest distance from the top pin 40 to the second grounding point 65a, including the height direction and width direction, are approximately equal.

[0069] Therefore, the force components directed toward the ground and toward the quick hitch 3 at the first grounding point 62a and the second grounding point 65a can be made to approximate each other. When the top hook 30 scoops up the top pin 40, the working unit 50 can move toward the quick hitch 3 without rotating about an axis in the vertical direction, which contributes to proper engagement of the lower pin 41 and the input shaft 45 after the top hook 30 scoops up the top pin 40. As described above, the quick hitch 3 can be smoothly engaged with the mounting unit 4, which prevents damage to the top pin 40, the lower pin 41, and the input shaft 45.

[0070] Even when the top pin 40 of the mounting part 4 is lifted up by the quick hitch 3, the third grounding point 68a is separated from the ground, and the first grounding point 62a and the second grounding point 65a are in contact with the ground, the agricultural work machine 2 does not rotate left or right with respect to the traveling direction. Therefore, when attaching the quick hitch 3 to the agricultural work machine 2, the agricultural work machine 2 can be attached while being stabilized, and the worker can easily attach it. The configuration of the stand 6 makes it possible to efficiently connect the traveling body 1 and the agricultural work machine 2 and fix them together.

[0071] Once the attachment of the quick hitch 3 to the agricultural work machine 2 is complete and the traveling body 1 and the agricultural work machine 2 are fixed together, the stand 6 is removed. Also, when work is completed, the stand 6 is attached to the agricultural work machine 2. The first stand 61, second stand 64, and third stand 67 that make up the stand 6 are configured as simple pillars, and therefore each can be configured to be extremely lightweight. Therefore, the worker can easily attach and detach the stand 6 from the agricultural work machine 2. [Industrial Applicability]

[0072] INDUSTRIAL APPLICABILITY The present invention can be utilized in a work machine that is mounted to the rear of a traveling unit such as a tractor and performs work while being offset to the side in the traveling direction. [Explanation of symbols]

[0073] 1 Running vehicle 2 Agricultural machinery 20 Offset mechanism 21 Front Frame 22 Offset Frame 23 Rear frame 25 Swivel Axis 3 Quick Hitch 4. Mounting part 50 Working section 51 Cover 51a side plate 51b side plate 6 Stand 61 First Stand 62a 1st grounding point 63 First mounting part 64 Second Stand 65a 2nd grounding point 66 Second mounting part 67 Third Stand 68a 3rd grounding point 70 Third mounting part 8 Grounding part 80 gauge roller 82 Rotating shaft 84 Skid 84a Skid 84a2 1st grounding part 84a3 Second grounding part G Center of gravity

Claims

1. An agricultural work machine having a mounting part having a top pin that can be engaged with a traveling machine body, and a plurality of stands that are detachably provided on the machine body and can support the machine body by grounding it, The grounding portions of at least two of the stands are equidistant from the top pin in a plan view. Agricultural machinery characterized by:

2. The grounding position of the stand is arranged at an asymmetrical position with respect to the front-rear axis passing through the top pin as a center.

2. The agricultural machine according to claim 1 .

3. The grounding positions of the stands are different from each other in the front and rear positions with respect to the traveling direction.

2. The agricultural machine according to claim 1 .

4. The center of gravity of the aircraft supported by the stand is biased to the left or right side with respect to the top pin in a plan view.

2. The agricultural machine according to claim 1 .

5. All of the stands are located at approximately the same distance from the center of gravity of the aircraft in a plan view.

2. The agricultural machine according to claim 1 .

6. The stand includes an elongated body, a wheel disposed at an end of the elongated body, 2. The agricultural machine according to claim 1, further comprising:

7. A working unit that is movable in a width direction with respect to a traveling direction relative to the mounting unit, At least two of the stands are provided on the working section.

6. An agricultural machine according to claim 1,

8. a working unit that is movable in a width direction relative to the mounting unit with respect to the traveling direction and that is rotatable in a vertical direction, At least two of the stands are provided on the working section.

6. An agricultural machine according to claim 1,

9. A stopper that fixes the vertical rotation of the working unit; 8. The agricultural machine according to claim 7, further comprising:

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