Agricultural working machine

Abstract

To provide a grass cutting working machine capable of maintaining the posture of a working portion constant.SOLUTION: A grass cutting working machine 1 includes a working machine main body 11 connected to a three-point link portion of a tractor, and a working portion 12 having a pair of left and right ground-contact wheels 13 rotatable about a lateral axis X. The working portion 12 is configured to be pivotable vertically with respect to the working machine main body 11 about the lateral axis X.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an agricultural machine. [Background technology]

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

[0003] This conventional agricultural work machine comprises, for example, a work machine main body that is connected to the rear of a traveling vehicle, and a working unit that is provided on the work machine main body, and this working unit has a ground contact body such as a rotatable gauge roller that comes into contact with the work surface (surface to be worked on) during work. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-99286 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional agricultural work machines, if there is a difference in height between the traveling surface on which the traveling vehicle travels and the working surface on which the ground contacting body of the working unit comes into contact, the posture of the working unit will change.

[0006] That is, for example, when the working surface is higher than the traveling surface, the working unit will be inclined forward, and conversely, when the working surface is lower than the traveling surface, the working unit will be inclined backward.

[0007] Therefore, one object of the embodiments of the present invention is to provide an agricultural work machine that can maintain a constant posture of the working unit. [Means for solving the problem]

[0008] An agricultural work machine according to an embodiment of the present invention is an agricultural work machine that is used by being coupled to a traveling vehicle, and is equipped with a working unit that performs a specified task, the working unit having a ground contact body that can rotate around a specified axis, and is capable of rotating in the vertical direction around the specified axis.

[0009] Furthermore, an agricultural work machine according to an embodiment of the present invention is an agricultural work machine that is used by being connected to a traveling vehicle, and comprises a work machine main body that is connected to the traveling vehicle, and a working unit that is provided on the work machine main body and has a ground contact body that can rotate around a predetermined axis, and the working unit can rotate in the vertical direction around the predetermined axis. [Effects of the Invention]

[0010] According to the embodiment of the present invention, the posture of the working unit can be maintained constant. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side view of a brush cutting machine according to an embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a plan view showing the working state of the same brush cutting machine. [Figure 6] FIG. 2 is a side view showing the working state of the same brush cutter (when the travel surface and the working surface are at the same height). [Figure 7] FIG. 2 is a side view showing the working state of the same brush cutter (when the working surface is higher than the travel surface). DETAILED DESCRIPTION OF THE INVENTION

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

[0013] In the figure, reference numeral 1 denotes a grass cutting machine, which is an agricultural work machine, and this grass cutting machine 1 is a flail mower that is used by being connected (mounted) to the rear of a tractor 2, which is a traveling vehicle.

[0014] That is, the mowing machine 1 is detachably connected to the rear of the tractor 2, and moves forward (in the direction of travel) as the tractor 2 travels, while performing predetermined work, i.e., mowing work (agricultural work).

[0015] More specifically, the grass cutting implement 1 is connected to a three-point linkage (agricultural implement lifting device) 3 at the rear of the tractor 2 via a quick coupler (coupling device) 4, and moves forward as the tractor 2 travels forward, cutting and shredding the grass to be cut (for example, weeds, straw, second ears of wheat, green manure, etc.) (see Figures 5 to 7). The grass cutting implement 1 is an offset implement that can be offset to the side of the tractor 2, i.e., to the right, for example.

[0016] As shown in Figures 1 to 4, the mowing machine 1 comprises a work machine body 11 connected to a three-point link section 3 at the rear of the tractor 2 via a quick coupler 4, and a work section 12 provided at the rear end of the work machine body 11 and having a plurality of ground contact wheels 13, i.e., two ground contact bodies, that can rotate around a left-right axis (a predetermined axis) X, and that performs the predetermined work of mowing the grass.

[0017] The working unit (grass-cutting working unit) 12 is rotatable in the vertical direction about a left-right axis X relative to the working machine body 11. As is clear from Figure 2, the left-right axis X (imaginary line), which is the rotation center of the ground-contacting wheels 13 and the rotation center of the working unit 12, is located near the rear end of the working unit 12.

[0018] The work machine body 11 has an attachment section 16 that is connected (attached) to the three-point link section 3 at the rear of the tractor 2 via a quick coupler 4, a support section (working section support body) 17 that supports the working section 12 so that it can rotate up and down around a left-right axis X, and a connecting section 18 that connects the attachment section 16 and the support section 17.

[0019] The work machine body 11 also has a first cylinder (offset cylinder) 21, which is an extendable first drive means that moves the support part 17 together with the working part 12 in the left-right direction relative to the mounting part 16, and a second cylinder (tilt cylinder) 22, which is an extendable second drive means that rotates the support part 17 together with the working part 12 in the up-down direction about a rotation central axis (rotation fulcrum) 20 in the front-to-rear direction relative to the connecting part 18. Each of the cylinders 21, 22 is, for example, an electric hydraulic cylinder.

[0020] Therefore, the working unit 12 supported by the support part 17 can be changed (position changed) between a stored state and an offset state by extending and contracting the first cylinder 21, and can be changed (position changed) between a horizontal position and an inclined position (upward inclined position, downward inclined position) by extending and contracting the second cylinder 22.

[0021] The stored state is a state in which the working unit 12 is located at a storage position behind the tractor 2 (a position in which substantially the entire working unit is stored within the width of the tractor). The offset state is a state in which the working unit 12 is located at an offset position that is shifted to the right from the storage position behind the tractor 2 by a desired offset amount (movement amount).

[0022] The working unit 12 can perform grass cutting work in either the stored state or the offset state, and can also perform grass cutting work in either the horizontal position or the inclined position.

[0023] The mounting unit 16 has a hitch frame 26, which is a mounting frame, and this hitch frame 26 is provided with a three-point connection unit 27 that is detachably connected to the three-point link unit 3 at the rear of the tractor 2 via a quick coupler 4. The three-point connection unit 27 has a top mast 28 and a pair of left and right lower arms 29, and a top pin 31 is attached to the top mast 28, and a lower pin 32 is attached to the lower arms 29.

[0024] The hitch frame 26 is also provided with an input shaft holder 34 that rotatably holds an input shaft 33 that receives power from the tractor 2. The input shaft 33 is connected to the PTO shaft of the tractor 2 via a joint, and inputs power from the PTO shaft to the brush cutter 1. Furthermore, an arm attachment part 35 is provided on the right side of the hitch frame 26.

[0025] The connecting portion 18 has two pivoting arms (parallel links) 41 whose front ends are rotatably attached to the arm mounting portion 35 via vertical axes 36, and the rear ends of each connecting arm 41 are rotatably attached to the arm mounting member 42 via vertical axes 37.

[0026] The arm mounting member 42 also has a bearing 43, which rotatably holds a rotation center shaft 20 in the front-to-rear direction, and the rotation center shaft 20 is fixed to a shaft holding portion 44 of the support portion 17. The support portion 17, which supports the working unit 12, is rotatable in the up-and-down direction around the rotation center shaft 20 fixed to the shaft holding portion 44.

[0027] Furthermore, the arm mounting member 42 has a cylinder mounting portion 46, and the tip end of the rod 22a of the second cylinder 22 is rotatably mounted to this cylinder mounting portion 46. The base end of the cylinder body 22b of the second cylinder 22 is rotatably mounted to a cylinder mounting portion 47 of the support portion 17.

[0028] The support section (frame section) 17 has a front frame 51 and a rear frame 52 that are parallel to each other and elongated in the left-right direction, and these frames 51, 52 are connected to each other by two connecting frames 53 that are elongated in the front-rear direction. Each of the frames 51, 52, 53 is made of, for example, a long, thin cylindrical (or rectangular) pipe.

[0029] A shaft holding portion 44 is provided on the left side of the front frame 51, and a cylinder mounting portion 47 is provided on the right side of the front frame 51. Rotating member holding portions 56 that rotatably hold rotating members 55 such as tumblers are provided on both left and right ends of the front frame 51.

[0030] Mounting plates 57 are fixed to both left and right ends of the rear frame 52, and side plates 58 are detachably attached to each mounting plate 57 by mounting means (bolts, nuts, etc.) not shown. The working unit 12 is supported by these left and right side plates (support plates) 58, which are spaced apart and facing each other, so as to be rotatable in the up and down direction about a horizontal axis X in the left-right direction.

[0031] The working unit 12 has a working body 61 that rotates in a predetermined direction (the up-cut direction, which is the direction of the arrow shown in Figure 1) to perform grass cutting work (cutting and shredding grass growing on the work surface), and this working body 61 is covered by a cover body 62.

[0032] The cover body 62 has an upper cover plate portion 63 that covers the upper side of the working body 61 and left and right cover side plate portions 64 that cover the sides of the working body 61.

[0033] A pulley case 66 is provided on the left cover side plate portion 64, and a gear case 67 is attached to this pulley case 66. An intermediate input shaft 68 is rotatably held by the gear case 67, and a power transmission body 69 that transmits power from the input shaft 33 is connected to this intermediate input shaft 68.

[0034] The power input from the power transmission body 69 to the intermediate input shaft 68 is transmitted to the working body 61 by a power transmission means (not shown) including, for example, a bevel gear, a transmission shaft, a pulley, and a belt.

[0035] The working body 61 has a rotating shaft (claw shaft) 71 that is elongated in the left-right direction and rotates when power is received from the power transmission means, and a plurality of working claws, or grass-cutting claws 74, that are detachably attached to a claw mounting portion 72 of the rotating shaft 71 via mounting members 73 and perform grass-cutting work while rotating in a predetermined up-cut direction.

[0036] In addition, the working unit 12 has left and right ground wheels 13 that come into contact with the work surface (surface to be worked on) when the working unit 12 is working, and these ground wheels 13 are arranged rearward of the working body 61 of the working unit 12.

[0037] The ground contact wheel 13 is rotatably supported by a left-right shaft member (fixed shaft) 76 that is fixed so as to protrude outward, for example, to the rear lower part of the cover side plate portion 64. In other words, the ground contact wheel 13 is rotatable around the shaft member 76, which is a round shaft portion through whose core the left-right axis X, which is also the rotation fulcrum of the working unit 12, passes.

[0038] The tip of the shaft member 76 is rotatably connected to a boss portion 59 of the side plate 58 of the support portion 17 via, for example, a bearing. As is clear from FIG. 1, the shaft member 76, through which the axis X passes (the shaft center), is located rearward of the rotation shaft 71 in side view.

[0039] Furthermore, the working unit 12 has grounding plates 77, which are left and right grounding members in the shape of plates that come into contact with the work surface (surface to be worked on) when the working unit 12 is working, and these grounding plates 77 are arranged on the front side of the grounding wheel 13.

[0040] The ground plate 77 is, for example, an elongated bent plate whose front end is bent upward, and is fixed to the lower end of the cover side plate portion 64 along its lower end.

[0041] The working unit 12 also has left and right regulating means 81 for regulating the range of vertical rotation of the working unit 12 around the axis X relative to the side plate 58 of the support unit 17 of the work machine body 11, and these regulating means 81 are composed of, for example, a connecting rod 82 and upper and lower springs 83 and 84 for cushioning purposes arranged on the outer periphery of the connecting rod 82.

[0042] The connecting rod 82 is inserted through the insertion hole of the rotating member 55, and its lower end is rotatably connected to a protrusion 85 that protrudes forward from the cover upper plate portion 63.

[0043] An annular upward rotation restricting portion (upper stopper) 86 protrudes from the vicinity of the lower end of the connecting rod 82. The annular upward rotation restricting portion (upper stopper) 86 restricts upward rotation of the working unit 12 about the axis X relative to the side plate 58 of the support unit 17. The annular upward rotation restricting portion (lower stopper) 87 protrudes from the upper end of the connecting rod 82. The annular downward rotation restricting portion (lower stopper) 87 restricts downward rotation of the working unit 12 about the axis X relative to the side plate 58 of the support unit 17.

[0044] 4, downward rotation of the working unit 12 is restricted by the downward rotation restricting portion 87 abutting against the rotating member 55 via the upper buffer spring 83. Furthermore, as shown by the two-dot chain line in FIG. 4, upward rotation of the working unit 12 is restricted by the upward rotation restricting portion 86 abutting against the rotating member 55 via the lower buffer spring 84.

[0045] Next, the operation of the brush cutting machine 1 will be described.

[0046] For example, as shown in FIG. 5, a case will be described in which grass cutting work is performed in an offset state in which the working unit 12 in a horizontal position is offset to the right side relative to the tractor 2.

[0047] First, when the running surface A on which the front wheels 91 and rear wheels 92 of the tractor 2 run and the work surface B on which the ground contact wheels 13 and ground contact plates 77 of the work unit 12 come into contact are at the same height, the connecting arm (parallel link) 41 of the work machine body 11 remains horizontal, as shown in Figure 6, and the work unit 12 performs grass cutting work on the work surface B in the desired posture.

[0048] Next, if there is a difference in height H between the travel surface A on which the front wheels 91 and rear wheels 92 of the tractor 2 travel and the work surface B on which the ground contact wheels 13 and ground contact plate 77 of the working unit 12 contact the ground, and for example, if the work surface (such as the top of a ridge) B is higher than the travel surface A, as shown in Figure 7, the quick coupler 4 will tilt forward and the connecting arm 41 of the work machine body 11 will be inclined at a predetermined inclination angle α with respect to the horizontal, but the working unit 12 will perform the grass cutting work on the work surface B in the same desired posture as in Figure 6. Although not shown, even if the work surface B is lower than the travel surface A, for example, the working unit 12 will perform the grass cutting work in the same posture.

[0049] In other words, even if the posture of the work machine body 11 (the up and down position of the three-point link unit 3 of the tractor 2) changes due to the difference in elevation between the travel surface A and the work surface B, the posture of the work unit 12 does not change because the work unit 12 can rotate up and down relative to the work machine body 11 (relative to the three-point link unit) around a predetermined axis X, and the ground contact wheel 13 and ground contact plate 77 contact and follow the work surface B.

[0050] The above-mentioned mowing machine 1 comprises a work machine body 11 connected to the three-point link section 3 at the rear of the tractor 2, and a working section 12 provided at the rear end of the work machine body 11 and having a ground-contact wheel 13 that can rotate around a predetermined axis, that is, a left-right axis (shaft member 76) X. Since the working section 12 can rotate up and down around the left-right axis (shaft member 76) X relative to the side plate 58 of the support section 17 of the work machine body 11, the posture of the working section 12 does not change even if there is a difference in height between the running surface A and the working surface B, and the posture of the working section 12 can be maintained constant, and therefore mowing work can be carried out stably regardless of the difference in height between the running surface A and the working surface B.

[0051] In addition, the working unit 12 has an upward rotation regulating section 86 that regulates upward rotation of the working unit 12 relative to the side plate 58 of the support unit 17 of the work machine main body 11, and a downward rotation regulating section 87 that regulates downward rotation of the working unit 12 relative to the side plate 58 of the support unit 17 of the work machine main body 11, so that the working unit 12 can be appropriately prevented from rotating unnecessarily.

[0052] The working part of the grass cutting machine, which is an agricultural work machine, is not limited to one that performs grass cutting work by rotating around a left-right rotation axis (horizontal axis), but may also be one that performs grass cutting work by rotating around an up-down rotation axis (vertical axis), for example.

[0053] Furthermore, the working unit is not limited to a rotary type, and may be, for example, a type having a reciprocating cutting blade, such as a reciprocating mower. Note that, as a driving means for driving the rotating shaft and cutting blade, for example, a hydraulic pump, a hydraulic motor, an electric motor, etc. may be used.

[0054] Furthermore, the rotatable grounding body possessed by the working unit is not limited to a pair of two grounding wheels, one on the left and one on the right, and the number, shape, mounting position, etc. are arbitrary, and it may consist of, for example, a single grounding roller (gauge roller) that is longitudinal in the left-right direction.

[0055] Alternatively, for example, one or more grounding bodies such as grounding rings may be rotatably provided on the left end side of the working unit, and a grounding member such as a grounding plate may be fixedly provided on the right end side of the working unit.

[0056] Furthermore, for example, a configuration may be adopted in which a plurality of grounding bodies are rotatably supported by a single common shaft member that is elongated in the left-right direction.

[0057] Furthermore, for example, the shaft member that is the center of rotation of the rotatable grounding body and the shaft member that is the center of rotation of the working part that can rotate in the vertical direction may be separate members, and these two shaft members may be arranged coaxially.

[0058] Furthermore, for example, the configuration may be such that a rotatable grounding body is positioned forward of the working body of the working section (such as a rotatable working body or a working body that can move back and forth in the left and right direction), and a grounding member is positioned behind this grounding body.

[0059] In addition, the working part may be configured to be rotatable in the vertical direction around a predetermined axis provided on the support part, such as a left-right axis passing through the center of the rear frame (e.g., a round pipe) of the support part of the work machine body.

[0060] On the other hand, agricultural work machines are not limited to grass-cutting machines (grass cutters) that cut grass on work surfaces (surfaces to be worked on) such as the ground, field floors, or top surfaces of ridges, but may also be, for example, spreaders that spread materials on work surfaces, or harvesters that harvest crops on work surfaces.

[0061] Although several embodiments and modifications of the present invention have been described, it is also possible to combine the embodiments and modifications as appropriate without departing from the gist of the present invention. [Explanation of symbols]

[0062] 1. Grass cutting machine, which is an agricultural machine 2 Tractor as a traveling vehicle 11 Work machine body 12 Working section 13 Grounding wheel as the grounding body 76 Shaft member 77 Grounding plate, which is a grounding member 86 Upper rotation restriction part 87 Downward rotation restriction part X-axis (the horizontal axis that is the specified axis)

Claims

1. An agricultural work machine used by being coupled to a traveling vehicle, A working unit that performs a predetermined task is provided, The working unit has a grounding body that can rotate around a predetermined axis, and is rotatable in the up and down direction around the predetermined axis. Agricultural machinery characterized by:

2. An agricultural work machine used by being coupled to a traveling vehicle, a work machine body connected to the traveling vehicle; a working unit provided on the working machine body and having a grounding body rotatable around a predetermined axis, The working unit is rotatable in the up and down direction around the predetermined axis. Agricultural machinery characterized by:

3. The grounding body of the working unit is rotatable around a shaft member in the left-right direction, the predetermined axis of which passes through the shaft center; The working unit is rotatable in the up and down direction around the shaft member.

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

4. The working section is an upward rotation restricting portion that restricts upward rotation of the working portion; a downward rotation restricting portion that restricts downward rotation of the working portion; 3. The agricultural machine according to claim 1 or 2.

5. The working unit has a grounding member 3. The agricultural machine according to claim 1 or 2.

6. The working unit is capable of mowing at least in the offset state.

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

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