Agricultural implement

Abstract

To provide an agricultural implement which prevents entry of foreign objects between two clutch members.SOLUTION: An agricultural implement comprises: a center work part coupled to a travel vehicle body; and a side work part which is coupled to at least any one end of left and right ends of the center work part, the side work part being developed and folded. The center work part and the side work part comprise respectively: a center rotation axis; and a side rotation axis, the center rotation axis and side rotation axis extending laterally. In the implement, power from the travel vehicle body is transmitted to the center rotation axis. On each of one end of the center rotation axis and one end of the side rotation axis, a clutch is provided, the clutch capable of being coupled and detached. When the side work part is in a developed state, the clutch is in a coupled state in which the power can be transmitted from the center rotation axis to the side rotation axis. When the side work body is folded, the clutch is in a connection release state in which the power cannot be transmitted to the center rotation axis to the side rotation axis. On at least one of the center work part and the side work part, a clutch cover for covering the clutch in the developed state, is fitted.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a clutch cover for an agricultural machine, and more particularly to a foldable agricultural machine. [Background technology]

[0002] Conventionally, there have been known agricultural machines with a long width, such as harrows, in which the left and right side working sections can be folded upward (opened and closed) relative to the central working section in order to keep the width within a predetermined range when traveling on public roads (Patent Document 1). In such foldable agricultural machines, power transmitted from a traveling vehicle such as a tractor is first transmitted to a central working unit, and then transmitted from the central working unit to a side working unit via a clutch. This clutch is designed to release the power transmission in the folded state (closed state), and to transmit the power in the unfolded state (open state). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5132348 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional foldable agricultural machinery, the clutch that transmits power from the central working part to the side working part is open at the front, back, top and bottom, which means that foreign objects such as dirt and grass can get between the two clutch components and become caught between the teeth of the two clutch components, causing problems such as smooth power transmission and damage to the teeth of the clutch components.

[0005] Therefore, an object of the present invention is to solve the above problem and provide an agricultural machine that prevents foreign matter from getting between the two clutch members. [Means for solving the problem]

[0006] In order to solve such problems, the present invention has the following configuration. An agricultural work machine comprising a central working unit connected to a traveling body, and a side working unit connected to at least one of the left and right ends of the central working unit so as to be foldable and unfoldable, the central working unit and the side working unit each having a central rotation shaft and a side rotation shaft extending to the left and right, respectively, and power from the traveling body is transmitted to the central rotation shaft, A clutch capable of coupling / coupling is provided at one end of the central rotating shaft and one end of the side rotating shaft, When the side working unit is in an unfolded state, the clutch is in a connected state in which power can be transmitted from the central rotating shaft to the side rotating shaft, and when the side working unit is in a folded state, the clutch is in a disconnected state in which power cannot be transmitted from the central rotating shaft to the side rotating shaft, An agricultural work machine, characterized in that a clutch cover that covers the clutch when in the unfolded state is attached to at least one of the central working unit and the side working unit. Effect of the Invention

[0007] According to the present invention, by providing a clutch cover that covers the clutch, it is possible to provide an agricultural machine that prevents foreign matter from entering between the two clutch members. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a halo 1 according to an embodiment of the present invention in a deployed state. [Diagram 2] FIG. 2 is a perspective view of the left working unit 13L of the halo 1 in the folded state according to the embodiment of the present invention. [Diagram 3] FIG. 2 is a side view of the left working unit 13L of the halo 1 in the folded state according to the embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing a clutch 2 according to an embodiment of the present invention. [Diagram 5]11 is an enlarged front view of the clutch cover 3 of the harrow 1 in the first modified example of the present invention with the left working unit 13L in the folded state. FIG. [Figure 6] FIG. 13 is a diagram showing a clutch cover 3 according to a third modified example of the present invention. [Figure 7] 13 is a diagram showing the trajectory of opening and closing of the left working unit 13L of the harrow 1 in the third modified example of the present invention. FIG. [Figure 8] FIG. 13 is a diagram showing a clutch cover 3 according to a fourth modified example of the present invention. [Figure 9] FIG. 13 is a diagram showing a clutch 2 according to a modified example 5 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Embodiment] Hereinafter, a harrow 1 according to an embodiment of the present invention will be described with reference to the drawings. The foldable agricultural machine may be a rotary cultivator, a rice transplanter, or the like. In the following description, the same reference numerals in different drawings indicate parts having the same functions, and duplicated descriptions in each drawing will be omitted as appropriate. For the sake of convenience, terms indicating directions such as up, down, front, rear, right, and left are used, but the direction in which gravity acts is down, and the opposite is up. The direction in which the traveling vehicle moves is forward, and the opposite is rear. Furthermore, when facing forward, the right side is right, and the left side is left.

[0010] [Halo overall composition] FIG. 1 is a perspective view of a halo 1 according to an embodiment of the present invention in a deployed state, seen from the left rear. FIG. 2 is a perspective view of the left working unit 13L of the halo 1 in the embodiment of the present invention in a folded state, seen from the left rear. FIG. 3 is a left side view of the left working unit 13L of the halo 1 in the folded state according to the embodiment of the present invention.

[0011] As shown in FIGS. 1 and 2, the harrow 1 in this embodiment is an agricultural work machine used for tilling work and the like, and includes a mounting part 11, a frame 12, and a working part 13. The harrow 1 is connected to a traveling vehicle body (not shown) such as a tractor by a mounting part 11. A frame 12 is connected to the mounting part 11, and a working part 13 is connected to the frame 12. As a result, the harrow 1 is pulled as the traveling vehicle body travels, and the working part 13 performs work such as plowing.

[0012] In the harrow 1 of this embodiment, the width (width in the left-right direction) is wider than the width of the traveling body, and the left and right sides of the harrow 1 extend out to the left and right sides from the traveling body, so that the working units 13 on both the left and right sides are configured to be foldable (openable and closable) toward the center in order to narrow the width when moving from the garage to the field or between fields. The working unit 13 is divided into three parts: a central working unit 13C, which is slightly wider than the distance between the rear tires of the traveling body, a left working unit 13L, and a right working unit 13R. The left working unit 13L and the right working unit 13R are almost symmetrical and have almost the same configuration. Each of the central working unit 13C, the left working unit 13L, and the right working unit 13R is provided with a working rotor 131 having a rotating shaft 1312 to which a working claw 1311 is fixed.

[0013] [Installation part] The mounting portion 11 is connected to a three-point link mechanism (not shown) provided at the rear of the vehicle body. The three-point link mechanism is usually composed of a top link, a lift rod, and a lower link. The three-point link mechanism is a well-known mechanism, so a detailed description thereof will be omitted. The mounting portion 11 has a top mast 111 connected to the top link and a lower link connecting portion 112 connected to the lower link. The halo 1 can be raised and lowered via the mounting part 11 by a three-point link mechanism.

[0014] Frame The frame 12 has a gear box 121 connected to the mounting portion 11, a support frame 122 connected to the gear box 121, and a chain case 123. The gear box 121 is disposed in the center of the left and right support frames 122. The gear box 121 has an input shaft (not shown), and power is transmitted from a PTO shaft (not shown) of the traveling vehicle body via a universal joint (not shown).

[0015] The support frame 122 is a main body frame of the harrow 1, and supports the working unit 13. The support frame 122 is divided into a left support frame 122L on the left side and a right support frame 122R on the right side, with the gear box 121 in between. In this embodiment, a transmission shaft (not shown) is housed within the left support frame 122L, and power from the gear box 121 is transmitted thereto.

[0016] The chain case 123 is installed at the left end of the central working unit 13C and houses a chain (not shown) that transmits power from the transmission shaft in the left support frame 122L to a rotating shaft 1312 (central rotating shaft: not shown) on which the working claws of the central working unit 13C are attached. The input sprocket of this chain is attached to the transmission shaft in the left support frame 122L, and the output sprocket is attached to the rotating shaft 1312 (central rotating shaft) of the central working unit 13C. With the above-described configuration, in the harrow 1 of this embodiment, power is transmitted from the PTO shaft of the running body via a universal joint to the input shaft of the gearbox 121, from the input shaft of the gearbox 121 to the gear in the gearbox 121, via the transmission shaft in the left support frame 122L to the chain in the chain case 123, and from the chain to the rotating shaft 1312 (central rotating shaft) of the central working part 13C to which the working claw 1311 is attached. In this embodiment, the harrow 1 is of a down-cutting type, and the work rotor 131 (work claws 1311) rotates in the direction of travel of the harrow 1. That is, in this embodiment, the rotation shaft 1312 (central rotation shaft) of the central working unit 13C rotates counterclockwise when viewed from the left (see the arrow in FIG. 3).

[0017] [Working section] As described above, the working section 13 is divided into three sections: the central working section 13C, the left working section 13L, and the right working section 13R. The left working section 13L and the right working section 13R are configured to be openable and closable between a folded upward state (closed state) and a deployed state (open state) relative to the central working section 13C. The working rotor 131 of the central working unit 13C is covered by a central shield cover 132C, the working rotor 131 of the left working unit 13L by a left shield cover 132L, and the working rotor 131 of the right working unit 13R by a right shield cover 132R.

[0018] The central shield cover 132C and the left shield cover 132L are connected by a left rotation support part 133L, and the central shield cover 132C and the right shield cover 132R are connected by a right rotation support part 133R, and the left working part 13L and the right working part 13R are supported so as to be freely rotatable relative to the central working part 13C, allowing them to be opened and closed. In addition, a left working unit opening / closing hydraulic cylinder (not shown) and a right working unit opening / closing hydraulic cylinder (not shown) are interposed between the left support frame 122L and the left rotation support part 133L, and between the right support frame 122R and the right rotation support part 133R, respectively, and these can be driven independently to open and close the left working unit 13L and the right working unit 13R, respectively.

[0019] A central apron 134C, a left apron 134L, and a right apron 134R are supported at the rear ends of the central shield cover 132C, the left shield cover 132L, and the right shield cover 132R, respectively, and a central leveller 135C, a left leveller 135L, and a right leveller 135R are supported at the lower ends of the central apron 134C, the left apron 134L, and the right apron 134R, respectively, so as to be rotatable in the vertical direction. The left apron 134L and the right apron 134R, and the left leveller 135L and the right leveller 135R are configured to be connected to the central apron 134C and the central leveller 135C, respectively, when the left working unit 13L and the right working unit 13R are opened.

[0020] A left EX leveller 136L and a right EX leveller 136R are rotatably supported on the left end of the left leveller 135L and the right end of the right leveller 135R, respectively, and can be opened and closed outward to the left and right, respectively. The left EX leveller 136L and the right EX leveller 136R are used to pull soil and mud on the sides of the working unit 13 inward and to level the soil on the sides of the working unit 13.

[0021] [clutch] FIG. 4 is a diagram showing the clutch 2 according to the embodiment of the present invention. Power is transmitted to the left working unit 13L from a chain in a chain case 123, and power is transmitted to the right working unit 13R from a rotating shaft 1312 (central rotating shaft) of the central working unit 13C via the clutch 2. As shown in Fig. 4, the clutch 2 rotates clockwise when viewed from the right. The clutch 2 that transmits power to the left working unit 13L will now be described. A central working unit side clutch 21 connected to the rotating shaft 1312 (central rotating shaft) of the central working unit 13C is arranged on the left outer side of the chain case 123 and supported by a working rotor support plate 13L1 provided on the central side plate of the left working unit 13L, and a left working unit side clutch 22 is arranged on the rotating shaft 1312 (side rotating shaft) of the left working unit 13L, one end of which protrudes toward the center of the working rotor support plate 13LI. The clutch 2 is disengaged when the left working unit 13L is in the folded state (closed state) and is engaged when the left working unit 13L is in the unfolded state (open state).

[0022] The central working unit-side clutch 21 has a disk 211 connected to the rotating shaft 1312 (central rotating shaft) of the central working unit 13C and six engaging protrusions 212 arranged at intervals in the circumferential direction of the disk 211 and protruding from the disk 211 to the left side, i.e., in the axial direction of the disk 211 of the central rotating shaft, while the left working unit-side clutch 22 has a disk 221 connected to the rotating shaft 1312 (side rotating shaft) of the left working unit 13L and six engaging protrusions 222 arranged at intervals in the circumferential direction of the disk 221 in correspondence with the arrangement of the engaging protrusions 212 so as to engage with the engaging protrusions 212 and protruding in the axial direction of the side rotating shaft. The engaging protrusions 222 have a tapered shape as they approach the tip, i.e., as they are positioned toward the center in the axial direction of the side rotating shaft. The engaging protrusion 212 has an abutment portion 212a that abuts against the engaging protrusion 222, and the engaging protrusion 222 has an abutment portion 222a that abuts against the engaging protrusion 212 (212a). When the left working unit 13L changes from the closed state to the open state, the engaging protrusion 222 fits into the separated portion of the engaging protrusion 212. Then, when the central rotating shaft is rotated in this state, the abutment portion 212a of the engaging protrusion 212 of the central working unit side clutch 21 and the abutment portion 222a of the engaging protrusion 222 of the left working unit side clutch 22 engage (abut) and mesh with each other, so that the power of the central rotating shaft is transmitted to the side rotating shaft. Note that the number of the engaging protrusions 212 and the engaging protrusions 222 is not limited to six, and can be designed to be any number, and the shapes of the engaging protrusions 212 and the engaging protrusions 222 are not limited to the shapes shown in the drawings, and can be designed to be any shape. The same is true for the clutch 2 that transmits power to the right working unit 13R. A central working unit-side clutch (not shown) connected to the rotating shaft 1312 (central rotating shaft) of the central working unit 13C is disposed on the right outer side of the central working unit 13C, and a right working unit-side clutch (not shown) is disposed on the rotating shaft 1312 (side rotating shaft: not shown) of the right working unit 13R, which is supported by a working rotor support plate (not shown) provided on a central side plate (not shown) of the right working unit 13R and has one end protruding toward the center of the working rotor support plate.

[0023] [Clutch cover] The clutch cover 3 is attached to the left outer side surface 1231 of the chain case 123 so as to cover the outer periphery of the central working unit clutch 21. The clutch cover 3 is cylindrical in shape and has a width such that the edge on the opening side abuts against the working rotor support plate 13L1 of the left working unit 13L. A (flange-shaped) mounting portion that protrudes toward the outer periphery is provided on the base side of the clutch cover 3, and this mounting portion is bolted to the left outer side surface 1231 of the chain case 123. When the left working unit 13L is in the open state (deployed to the side of the central working unit 13C), the clutch cover 3 covers the outer periphery of the engaged central working unit clutch 21 and left working unit clutch 22, so that the clutch 2 is completely covered by the left outer side surface 1231 of the chain case 123, the working rotor support plate 13L1 of the left working unit 13L, and the clutch cover 3, preventing foreign matter such as soil and grass from entering the clutch 2 from the outside. Also, in this embodiment, the clutch cover 3 is provided so as to cover the central working unit clutch 21, so that even when working is performed with the left working unit 13L folded and closed, the clutch cover 3 acts as a guard and makes it possible to reduce adhesion of foreign matter to the central working unit clutch 21. The mounting position of the clutch cover 3 is not limited to the above, and the clutch cover 3 can also be mounted on the working rotor support plate 13L1 of the left working unit 13L. In this case, when the left working unit 13L is in the open state, the edge of the opening side of the clutch cover 3 abuts against the left outer side surface 1231 of the chain case 123. With this configuration, the clutch cover 3 moves together with the left working unit 13L when the left working unit 13L is opened or closed. This movement of the clutch cover 3 makes it easier to discharge soil and the like that has accumulated inside the clutch cover 3 to the outside. Furthermore, the clutch covers may be attached to both the left outer side surface 1231 of the chain case 123 and the working rotor support plate 13L1 of the left working unit 13L. In this case, the edges of the opening sides of the two clutch covers may abut against each other, or the opening sides of the two clutch covers may partially overlap, or the two clutch covers may entirely overlap.

[0024] Similarly, the clutch 2 that transmits power to the right working unit 13R is configured to be covered by the clutch cover 3 when the right working unit 13R is in an open state (deployed state: state where it is deployed to the side of the central working unit 13C). The clutch cover 3 is attached to the right side plate (not shown) of the central working unit 13C. The edge of the clutch cover 3 on the opening side abuts against the working rotor support plate of the right working unit 13R. The clutch cover 3 can also be attached to the working rotor support plate of the right working unit 13R. In this case, when the right working unit 13R is in an open state, the edge of the clutch cover 3 on the opening side abuts against the right side plate of the central working unit 13C.

[0025] [Variation 1] FIG. 5 is an enlarged view of the clutch cover 3 of the harrow 1 of the first modified example in a folded state of the left working unit 13L, as viewed from the front. Although the clutch 2 is covered with the clutch cover 3, foreign matter such as soil may get in through the contact area between the edge of the opening side of the clutch cover 3 and the working rotor support plate 13L1 of the left working part 13L. Therefore, in the present modified example 1, a soil passage hole 31 is formed in a part of the clutch cover 3 to discharge foreign matter such as soil that has entered the inside to the outside. The soil escape hole 31 is formed on the side opposite to the opening side of the clutch cover 3, i.e., on the left outer side 1231 side (the base side of the clutch cover 3 opposite to the opening side of the clutch cover 3) of the chain case 123 to which the clutch cover 3 is attached, where foreign matter is likely to accumulate. Also, the soil escape hole 31 is formed to open at the bottom of the clutch cover 3 so that foreign matter can easily fall to the outside. The soil passage hole 31 is preferably formed in the lower part of the clutch cover 3, closer to the rotational direction of the clutch 2 than the center of rotation of the clutch 2 in a side view, that is, rearward in the traveling direction of the harrow 1. Furthermore, the clutch 2 may be provided with a discharge member that rotates together with the clutch 2 so that foreign matter such as soil that has entered the inside can be actively discharged to the outside through the soil passage hole 31. This discharge member may have any shape and structure as long as it rotates to move foreign matter toward the soil passage hole 31. For example, a plate-shaped or spiral blade may be attached to the outer periphery of the clutch 2 as the discharge member. Moreover, the clutch cover 3 between the central working portion 13C and the right working portion 13R can be configured in the same manner.

[0026] [Variation 2] In the above-mentioned first modification, the soil passage hole 31 is formed in the lower part of the clutch cover 3, but there is a possibility that foreign matter such as soil may get into the inside of the clutch cover 3 through this soil passage hole 31. Therefore, in the present modified example 2, a mesh portion is formed on the lower part of the clutch cover 3. The mesh portion is a net-like portion, or a portion having a large number of small holes formed therein like punching metal. The mesh portion allows foreign matter that has entered the inside of the clutch cover 3 to be expelled to the outside, but makes it difficult for foreign matter to enter the inside of the clutch cover 3 from the outside. It should be noted that the mesh portion need not be formed only on the lower portion of the clutch cover 3, but the entire clutch cover 3 may be made of mesh. Moreover, the clutch cover 3 between the central working portion 13C and the right working portion 13R can be configured in the same manner.

[0027] [Variation 3] Figure 6 shows a clutch cover 3 according to the third modified example of the present invention, where (a) is a view from the front with the left working unit 13L in the unfolded (open) state, and (b) is a see-through view of the inside of the clutch cover 3 in (a). As described above, dirt and other foreign matter can enter through the contact area between the opening edge of the clutch cover 3 and the working rotor support plate of the left working part 13L. In order to further prevent the intrusion of foreign matter through this contact area, in this third modification, an elastic member 32 made of an elastic material such as rubber, cork, or silicone is attached to the opening edge of the clutch cover 3, i.e., the part of the clutch cover 3 that contacts the working rotor support plate 13L1 of the left working part 13L. The dimensions of the clutch cover 3 are designed so that when the left working unit 13L is in the open state, the elastic member 32 is pressed by the working rotor support plate 13L1 of the left working unit 13L, causing the elastic member 32 to slightly contract. The inside of the clutch cover 3 is sealed by this elastic member 32, so that the intrusion of foreign matter can be completely prevented. The elastic member 32 may be of any shape, structure, or material as long as it can seal the clutch cover 3 and the working rotor support plate 13L1 of the left working unit 13L. Also, the clutch cover 3 itself may be made of an elastic material.

[0028] FIG. 7 is a diagram showing the trajectory of opening and closing of the left working unit 13L of the harrow 1 in the third modified example of the present invention, as viewed from the front. In the third modification, the width of the clutch cover 3 is increased by the width of the elastic member 32. This may cause the moving left working unit clutch 22 to collide with the elastic member 32 when the left working unit 13L is opened or closed. Therefore, in the third modification, the elastic member 32 is disposed outside the movement path 4 of the left working unit clutch 22 of the left working unit 13L, thereby ensuring that the elastic member 32 and the left working unit clutch 22 do not collide with each other.

[0029] The clutch cover 3 can also be attached to the working rotor support plate 13L1 of the left working unit 13L. In this case, the elastic member 32 is attached to the clutch cover 3 of the moving left working unit 13L. The movement trajectory of the elastic member 32 is set to be outside the clutch 21 on the central working unit side so that the moving elastic member 32 does not collide with the clutch 21 on the central working unit side. Also, instead of attaching the elastic member 32 to the edge on the opening side of the clutch cover 3, an elastic member may be attached to the working rotor support plate 13L1 of the left working unit 13L. Furthermore, elastic members may be attached to both the edge on the opening side of the clutch cover 3 and the working rotor support plate 13L1 of the left working unit 13L.

[0030] In addition, in order to reduce the possibility of collision between the moving left working unit clutch 22 and the elastic member 32, it is advisable to make the elastic member 32 shorter on the side of the trajectory of the moving left working unit clutch 22 (the side of the rotation shaft of the left working unit 13L) and longer on the opposite side. This configuration can also be adopted for the axial length (width) of the clutch cover 3 itself. That is, the side of the clutch cover 3 that follows the path of the moving left working unit clutch 22 (the side of the rotation shaft of the left working unit 13L) may be made shorter, and the opposite side may be made longer. In this case, the elastic member 32 may or may not be attached to the clutch cover 3. The configuration of the above-mentioned modified example 3 can be adopted for the clutch cover 3 between the central working unit 13C and the right working unit 13R, and can be configured in a similar manner.

[0031] [Variation 4] FIG. 8 shows a clutch cover 3 according to the fourth modified example of the present invention, which is between the central working unit 13C and the right working unit 13R, where (a) is a view from the right and (b) is a view from the front. The working claws 1311 are not disposed between the central working unit 13C and the left working unit 13L, and between the central working unit 13C and the right working unit 13R, that is, in the locations where the clutch 2 and the clutch cover 3 are disposed. For this reason, the working claws 1311 are not used for tilling in these locations. Therefore, in the present modified example 4, the residual tillage processing claws 5 are attached to the clutch cover 3. As shown in Figure 8, between the central working unit 13C and the right working unit 13R, the residual tillage processing tines 5 are attached near the center of the width of the clutch cover 3, extending downward with their tips bent outward to the right. The residual tillage processing tines 5 fixed to the clutch cover 3 move forward as the harrow 1 moves forward, and can perform tilling work on the field. Similarly, between the central working unit 13C and the left working unit 13L, the residual tillage processing claw 5 is attached near the center of the width of the clutch cover 3, extends downward, and has a shape in which the tip side is bent outward to the left (not shown). In addition, in the present modified example 4, the clutch cover 3 does not cover the entire circumference of the clutch 2, but is structured to cover only the front portion. Foreign objects such as soil often enter from the front while the vehicle is moving, so by covering only the front, the intrusion of foreign objects can be sufficiently prevented with a minimum of materials. Also, because the rear is open, any foreign objects that do enter can be expelled from the rear. In this fourth modified example, one residual tillage processing claw 5 is attached, but two residual tillage processing claws 5 may be attached. In this case, the bending directions of the tip side of the residual tillage processing claw 5 can be made different, and two types of residual tillage processing claws 5 can be used. Also, the tip side of one residual tillage processing claw 5 can be divided into two and bent in two different directions. In this way, the shape and structure of the residual tillage treatment claws 5 can be any shape and structure, and the mounting position of the residual tillage treatment claws 5 to the clutch cover 3 can be designed appropriately depending on the shape and structure of the residual tillage treatment claws 5. Also, as in the embodiment, the residual tillage processing claws 5 may be attached to the clutch cover 3 that covers the entire circumference of the clutch 2.

[0032] [Variation 5] FIG. 9 is a diagram showing a clutch 2 according to a fifth modified example of the present invention. The shapes of the central working unit side clutch 21 and the left working unit side clutch 22 are different from those of the clutch 2 in the above-described embodiment. The central working section side clutch 21 has a central shaft portion 213 , an outer peripheral ring 214 , and a plurality of spokes 215 connecting the central shaft portion 213 and the outer peripheral ring 214 . The spokes 215 protrude radially from the central shaft 213 toward the outer peripheral ring 214 at predetermined angles, and a plurality of holes 216 of the same shape are formed by the central shaft 213, the outer peripheral ring 214, and the spokes 215. In the present modified example 5, eight spokes 215 and eight holes 216 are formed. In this central working unit side clutch 21, the spokes 215 are the engaging protrusions, and the outer peripheral ring 214 is a ring formed on the outer periphery of the engaging protrusions. As shown in FIG. 9, the clutch 2 rotates clockwise when viewed from the right. The left working unit clutch 22 has a ring-shaped member 223 and a plurality of engaging protrusions 224 protruding from the ring-shaped member 223 in the axial direction. In this fifth modified example, eight engaging protrusions 224 are formed and engage with eight hole portions 216 of the central working unit side clutch 21; in other words, the spokes 215 are configured to engage between two engaging protrusions 224. The thickness (axial length) of the outer peripheral ring 214 is designed to be equal to or greater than the height (axial length) of the engaging protrusions 224, so that when the central working unit clutch 21 and the left working unit clutch 22 are engaged, the outer peripheral ring 214 covers the entire outer periphery of the clutch 2. This configuration makes it possible to prevent foreign matter from entering the clutch 2. Alternatively, the central working unit clutch 21 may be a clutch having a ring-shaped member 223 and an engaging pawl 224, and the left working unit clutch 22 may be a clutch having a central shaft portion 213, an outer peripheral ring 214, and spokes 215. The clutch 2 that transmits power to the right working unit 13R can also be a similar clutch.

[0033] In the above, the harrow 1 has been described as an example of a foldable agricultural working machine, but the clutch cover can be applied to any foldable agricultural working machine, not limited to the harrow 1, such as a rotary tiller or rice transplanter.

[0034] As described above, the halo 1 according to the embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments and modifications 1 to 5, and the present invention includes design changes within the scope of the present invention. In addition, the above-mentioned embodiments and modifications 1 to 5 can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose, configuration, etc. [Explanation of symbols]

[0035] 1. Hello 11 Mounting part 111 Topmast 112 Lower link connection 12 Frames 121 Gearbox 122 Support Frame 122L Left support frame 122R Right support frame 123 Chain case 1231 Left lateral surface 13 Working section 13C Central Work Section 13L Left working section 13L1 Working rotor support plate 13R Right working section 131 Working rotor 1311 Working claw 1312 Rotation axis 132C Center Shield Cover 132L Left shield cover 132R Right Shield Cover 133L Left rotation support part 133R Right rotation support 134C Central Apron 134L Left apron 134R Right Apron 135C Central Leveller 135L Left Leveler 135R Right Leveller 136L Left EX Leveller 136R Right EX Leveller 2 Clutch 21 Central working section side clutch 211 Disk 212 Engagement protrusion 212a Contact part 213 Central shaft part 214 Outer Ring 215 spokes 216 Hole 22 Left working part side clutch 221 Disk 222 Engagement protrusion 222a Contact part 223 Ring-shaped member 224 Engagement protrusion 3 Clutch cover 31 Soil Hole 32 Elastic member 4 Movement trajectory 5. Residual tillage processing claw

Claims

1. An agricultural work machine comprising a central working unit connected to a traveling body, and a side working unit connected to at least one of the left and right ends of the central working unit so as to be foldable and unfoldable, the central working unit and the side working unit each having a central rotation shaft and a side rotation shaft extending to the left and right, respectively, and power from the traveling body is transmitted to the central rotation shaft, A clutch capable of coupling / coupling is provided at one end of the central rotating shaft and one end of the side rotating shaft, When the side working unit is in an unfolded state, the clutch is in a connected state in which power can be transmitted from the central rotating shaft to the side rotating shaft, and when the side working unit is in a folded state, the clutch is in a disconnected state in which power cannot be transmitted from the central rotating shaft to the side rotating shaft, An agricultural work machine, characterized in that a clutch cover that covers the clutch when in the unfolded state is attached to at least one of the central working unit and the side working unit.

2. The clutch cover is attached to one of the central working portion and the side working portion, 2. The agricultural work machine according to claim 1, wherein an elastic member is attached to a portion of the clutch cover that contacts the other of the central working unit and the side working unit and / or a portion of the other of the central working unit and the side working unit that contacts the clutch cover when in the unfolded state.

3. The clutch cover is attached to the central working portion, 3. The agricultural machine according to claim 2, wherein the elastic member is disposed outside a movement path of the clutch provided on the side rotation shaft.

4. The clutch cover is attached to the side working part, 3. The agricultural machine according to claim 2, wherein the movement path of the elastic member is set so as to be outside the clutch provided on the central rotary shaft.

5. 2. The agricultural machine according to claim 1, wherein a soil passage hole is provided in a lower portion of the clutch cover.

6. 6. The agricultural machine according to claim 5, wherein the soil passage hole is provided on a side of the clutch cover where the clutch cover is attached to the central working section or the side working section.

7. 2. The agricultural machine according to claim 1, wherein a mesh portion is provided on a lower portion of the clutch cover.

8. 8. The agricultural machine according to claim 7, wherein the mesh portion is provided on a side of the clutch cover where the clutch cover is attached to the central working section or the side working section.

9. 9. The agricultural machine according to claim 1, wherein each of the clutches has an engaging protrusion, and the engaging protrusions mesh with each other to be connected.

10. 9. The agricultural machine according to claim 1, wherein one of the clutches has a ring formed on its outer periphery.

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