JP2017133611A - Clutch device and agricultural machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clutch device that can facilitate maintenance of a plowing claw and the like and suppress generation of wear and collision noise, and to provide an agricultural machine using the same.SOLUTION: The clutch device includes: a first clutch provided at an end part of a first rotation shaft and having a plurality of first claw parts; and a second clutch provided at an end part of a second rotation shaft and having a plurality of second claw parts meshing with the plurality of first claw parts. The second clutch is detachably fixed at the end part of the second rotation shaft.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a clutch device in which claw portions provided at respective end portions of a pair of rotating shafts mesh with each other to transmit rotational power, and an agricultural machine using the clutch device.

  A farming machine mounted on the rear part of a tractor through a three-point link hitch mechanism so as to be able to move up and down has a tilling rotor to which a plurality of tilling claws are attached, and the tilling rotor rotates by receiving power from the tractor.

  Some farm machines have a three-part structure including a central working unit and an extended working unit that is attached to both left and right ends of the central working unit so as to be pivotable in the vertical direction. In the agricultural machine having such a structure, the tilling rotor of the central working unit is rotated by the power from the tractor. At the same time, the tilling rotors of the left and right extension working units are configured to rotate via clutch devices that are provided at each end of the tilling rotor of the central working unit and the extension working unit and mesh with each other.

  For example, Patent Document 1 discloses that a protrusion projecting annularly on a substrate inside a dog clutch pawl provided on one rotation shaft of a pair of rotation shafts and the other rotation shaft of the pair of rotation shafts. A plate spring member made of a metal material that is provided on a substrate inside the claw portions of the provided dog clutch and that is elastically deformed by being pushed by the projection in a state where the claw portions of the pair of dog clutches are engaged with each other. A dog clutch device is disclosed.

JP 2010-196748 A

  In the configuration of the above-mentioned patent document, a plurality of tilling claws are attached to a dog clutch provided on the other rotating shaft via bolts. On the other hand, the other plurality of tilling claws are attached to the rotating shaft. Each of the plurality of tilling claws fixed to the rotating shaft has its end inserted through a holder provided on the rotating shaft, and is fixed with bolts. In such a configuration, since the mechanism for fixing the plurality of tilling claws is not unified, the plurality of tilling claws fixed to the dog clutch needs to be different from the other plurality of tilling claws. Therefore, it can be a factor complicating the maintenance of the tilling nail.

  In addition, since the claws of the pair of dog clutches made of a metal material are engaged with each other, the occurrence of wear and collision noise due to the collision of the claws caused by acceleration or deceleration in the rotation direction of the dog clutch is inevitable.

  In the present invention, in view of the above circumstances, a mechanism for fixing a plurality of tilling claws is unified, it is possible to facilitate maintenance of tilling claws and the like, and it is possible to suppress the occurrence of wear and collision noise due to collision between claws. An object is to provide a simple clutch device and an agricultural machine using the clutch device.

  A clutch device according to an embodiment of the present invention is provided at an end portion of a first rotating shaft, and is provided at an end portion of a second clutch and a first clutch having a plurality of first pawl portions. And a second clutch having a plurality of second claw portions meshing with the claw portions, wherein the second clutch is detachably fixed to an end portion of the second rotation shaft.

  An agricultural machine according to an embodiment of the present invention includes the clutch device.

  According to the present invention, a clutch device that unifies a mechanism for fixing a plurality of tilling claws, facilitates maintenance of the tilling claws and the like, and can suppress wear due to collision between claws and occurrence of collision noise. And an agricultural machine using the same can be provided.

It is a perspective view of the unfolded state explaining the composition of the agricultural machine concerning one embodiment of the present invention. It is a top view of the unfolding state explaining the composition of the agricultural machine concerning one embodiment of the present invention. It is a side view of the unfolding state explaining the composition of the agricultural machine concerning one embodiment of the present invention. It is a perspective view of the folding state explaining the composition of the agricultural machine concerning one embodiment of the present invention. It is a side view of the folding state explaining the composition of the agricultural machine concerning one embodiment of the present invention. It is a side view of the folding state explaining the composition of the clutch device concerning one embodiment of the present invention. It is a figure explaining the composition of the 1st clutch concerning one embodiment of the present invention. It is a figure explaining the structure of the 2nd clutch which concerns on one Embodiment of this invention. It is a figure explaining the composition of the cushion rubber concerning one embodiment of the present invention. It is a figure explaining the state which mounted | wore the 2nd clutch with the cushion rubber which concerns on one Embodiment of this invention. It is a side view explaining the state where the 1st clutch and 2nd clutch which concern on one Embodiment of this invention meshed | engaged mutually.

<First Embodiment>
Before describing the clutch device 100 according to the present embodiment in detail, a schematic configuration of the agricultural machine 10 that can include the clutch device 100 will be described. In the present embodiment, a description will be given by exemplifying a farm work machine 10 particularly for scratching work. However, the configuration of the clutch device 100 to be described later is not limited to this, and can also be applied to an agricultural machine for plowing and leveling work.

  Hereinafter, the configuration of the agricultural working machine 10 according to the present embodiment will be described with reference to the drawings. 1, 2, and 3 are a perspective view, a top view, and a side view in an unfolded state for explaining the configuration of the agricultural working machine 10 according to the present embodiment, respectively. 4 and 5 are a perspective view and a side view in a folded state for explaining the configuration of the agricultural working machine 10 according to the present embodiment.

  The agricultural working machine 10 according to the present embodiment has a three-part structure including a central working unit 10C, an extended working unit left 10L, and an extended working unit right 10R. The central working unit 10 </ b> C is disposed in the central part of the agricultural work machine 10. The extension work part left 10L and the extension work part right 10R are disposed at both left and right ends of the central work part 10C.

  Each of the extension work part left 10L and the extension work part right 10R can be turned up and down around a folding shaft 52 in the front-rear direction which is a pivot point provided at both left and right ends of the center work part 10C. It has become. The extension work part left 10L and the extension work part right 10R are selectively switched to the expanded state or the folded state by rotation.

  The central working unit 10C includes a top mast 12, a lower link connecting unit 14, an input shaft 16, a transmission frame 20, a support frame 22, a tilling rotor 28, a shield cover 34, a leveling plate 42, and a link mechanism. Part 44.

  The top mast 12 and the lower link connecting portion 14 are respectively provided at the front center portion and the front left and right two locations of the central working portion 10C. The top mast 12 and the lower link connecting portions 14 provided at the two left and right locations are respectively connected to the top link of the tractor (not shown) and the lower links (three point link hitch mechanisms) provided at the two left and right locations. It is attached to the rear part of the tractor so that it can be raised and lowered.

  A configuration of the central working unit 10C of the agricultural machine 10 according to the present embodiment will be described. The input shaft 16 is housed in a gear box 18 provided at the front center portion of the central working portion 10C and protrudes forward. Power is transmitted to the input shaft 16 from the PTO shaft of the tractor via a universal joint, a transmission shaft, and the like.

  The transmission frame 20 and the support frame 22 also serve as a main body frame, and extend horizontally on the left and right sides of the gear box 18. The transmission frame 20 includes a transmission shaft 21 (not shown). The support frame 22 does not include the transmission shaft 21 and may be hollow. A chain transmission case 24 is suspended from the side end portion of the transmission frame 20, and a side frame 26 is suspended from the side end portion of the support frame 22 so as to face the chain transmission case 24.

  The tilling rotor 28 includes a rotating shaft 30 (not shown), a drive side clutch 31C, and a plurality of tilling claws 32. The rotating shaft 30 is pivoted between the lower end portion of the chain transmission case 24 and the lower end portion of the side frame 26. The drive side clutch 31 </ b> C is provided at both ends of the rotating shaft 30. Although details will be described later, the drive side clutch 31C can supply rotational power to the extension work unit left 10L side by engaging with the driven clutch 31L provided on the extension work unit left 10L side in the deployed state. . The plurality of tilling claws 32 are detachably attached around the rotation shaft 30. For example, a plurality of holders for mounting the tilling claws 32 may be provided around the rotation shaft 30, and the tilling claws 32 may be inserted into the holder and fixed with bolts. The power transmitted from the tractor to the input shaft 16 is shifted in the gear box 18, the transmission shaft 21 is rotated to rotate the rotary shaft 30 via the chain transmission case 24, and the tilling rotor 28 is rotated in a predetermined direction. It is configured to perform tillage work.

  The shield cover 34 is disposed between the lower part of the transmission frame 20 and the support frame 22 and covers the tilling rotor 28.

  The leveling plate 42 is attached to the rear end of the shield cover 34. In the present embodiment, the leveling plate 42 includes a first leveling plate 42a and a second leveling plate 42b. The first leveling plate 42a is attached to the rear end portion of the shield cover 34 so as to be rotatable in the vertical direction, and the rear side extends obliquely downward. The cultivated ground is leveled by the rear end of the first leveling plate 42a. The 2nd leveling board 42b is attached to the rear-end part of the 1st leveling board 42a, and is attached to the rear-end part of the 1st leveling board 42a so that rotation in the up-and-down direction is possible. The cultivated ground of the field is leveled more flatly by the second leveling plate 42b.

  One end portion of the link mechanism portion 44 is connected to the rear portion of the gear box 18, and the other end portion is connected to the upper surface of the second leveling plate 42b. The link mechanism 44 is movable in the vertical direction as the second leveling plate 42b rotates in the vertical direction. In the present embodiment, the link mechanism portion 44 includes a swing arm 46 and a connecting rod 48.

  One end of the swing arm 46 is pivotally connected to the rear portion of the gear box 18, and the other end extends to the rear side in the aircraft traveling direction and can swing in the vertical direction. Here, one end portion of the swing arm 46 is rotatably connected to the rear portion of the gear box 18 with a shaft portion 50 extending in the lateral direction as a rotation fulcrum.

  The connecting rod 48 is connected between the other end of the swing arm 46 and the upper surface of the second leveling plate 42b. That is, the swing arm 46 is connected to the second leveling plate 42 b via the connecting rod 48. Both ends of the connecting rod 48 are rotatably connected to the swing arm 46 and the second leveling plate 42b. For this reason, when the second leveling plate 42b rotates in the vertical direction, the swing arm 46 rotates in the vertical direction via the connecting rod 48 with the shaft portion 50 as a rotation fulcrum.

  Next, the configuration of the extension work part left 10L and the extension work part right 10R will be described. Since the extension work part left 10L and the extension work part right 10R have a structure that is substantially symmetrical to each other, the configuration of the extension work part left 10L will be described in detail below.

  The extension work portion left 10L includes a left hydraulic cylinder 54L, two side frame lefts 56L and 57L, a tilling rotor 28L, a shield cover left 34L, and a leveling plate left 42L.

  The left hydraulic cylinder 54L functions as a left rotation drive means as a drive source for rotating the extension work part left 10L with respect to the central work part 10C based on an expansion / contraction operation. The extension working unit left 10L is positioned outside the central working unit 10C by rotating a predetermined angle in the unfolding direction around the folding shaft 52, for example, approximately 180 degrees, based on the operation of the left hydraulic cylinder 54L. The folded state is located above the central working unit 10C by rotating at a predetermined angle in the folding direction about the folding shaft 52, for example, approximately 180 degrees.

  The side frame left 56L and 57L are provided at the left and right ends of the extension work portion left 10L.

  The tilling rotor 28L is rotatably supported between lower portions of the side frame left 56L and 57L. The tilling rotor 28L has a rotating shaft 30L (not shown), a driven clutch 31L, and a plurality of tilling claws 32, similarly to the tilling rotor 28 provided in the central working unit 10C. The driven clutch 31L is provided at one end of the rotating shaft 30L. As will be described in detail later, the driven clutch 31L is engaged with a drive clutch 31C provided on the central working unit 10C side in the deployed state, whereby rotational power is supplied from the central working unit 10C side.

  The shield cover left 34L is provided between the upper portions of the side frame left 56L and 57L so as to cover the tilling rotor 28L. In the present embodiment, the shield cover left 34L is configured similarly to the shield cover 34 provided in the central working unit 10C.

  The leveling plate left 42L is attached to the rear end of the shield cover left 34L. In the present embodiment, the leveling plate left 42L is composed of a first leveling plate left 42La and a second leveling plate left 42Lb, similarly to the leveling plate 42 provided in the central working unit 10C.

  The extension work unit left 10L has a configuration in the direction of the rotation shaft 30L (not shown) of the tilling rotor 28L that is substantially the same as the configuration of the central work unit 10C. That is, in the cross section on the plane orthogonal to the rotary shaft 30L of the tilling rotor 28L, the cross-sectional configurations of the rotary shaft 30L, the shield cover left 34L, and the leveling plate left 42L of the tilling rotor 28L are substantially the same as those of the central working unit 10C. It has a cross-sectional configuration.

  As described above, the power transmitted from the tractor to the input shaft 16 is cultivated by the extension working unit left 10L and the extension working unit right 10R together with the tilling rotor 28 of the central working unit 10C through the transmission mechanism. It is transmitted to the rotors 28L and 28R (not shown), and is configured to rotate the tilling rotors 28L and 28R in a predetermined direction.

  The extended leveling plate left 58L is provided at the outer end of the second leveling plate left 42Lb so as to be rotatable in the vertical direction. The extended leveling plate left 58L is provided to be rotatable about a shaft portion 60 extending in the front-rear direction at the left and right outer ends of the second leveling plate left 42Lb. The extended leveling plate left 58L extends to the outside of the second leveling plate left 42Lb in the deployed work position, assists the leveling work of the second leveling plate left 42Lb, and is folded to the upper side of the second leveling plate left 42Lb. When rotated to the (storage position), it is stored on the second leveling plate left 42Lb.

  The extension leveling plate left 58L can be further rotated between a storage position and a work position by a turning device 62 provided on the shield cover left 34L of the extension work part left 10L. The rotation device 62 is connected between a drive motor 66 (not shown) covered with a cover 64 and between the drive motor 66 and the extended leveling plate left 58L, and the extension leveling plate left is driven by the driving force from the drive motor 66. And a link mechanism 68 for rotating 58L.

  The configuration of the extension work portion left 10L has been described above. The configuration of the extension work part right 10R is substantially the same as that of the extension work part left 10L, and L may be read as R for the reference numerals used in the description.

  The farm work machine 10 may further include a plurality of digging boards 70. The plurality of mulch plates 70 are attached to the front of the farm work machine 10. For example, when a tire mark of a traveling tractor is formed on the tillage ground and a soil offset occurs, the soil offset can be returned by the earthing plate 70 to flatten the tillable ground.

  Heretofore, the schematic configuration of the agricultural working machine 10 that can include the clutch device 100 according to the present embodiment has been described. Hereinafter, the configuration of the clutch device 100 according to the present embodiment will be described in detail with reference to the drawings. Since the extension work part left 10L and the extension work part right 10R have a structure that is substantially symmetrical with respect to each other, the extension work that engages with the drive side clutch 31C of the central work part 10C and the drive side clutch 31C of the central work part 10C will be described below. The configuration of the driven clutch 31L of the left part 10L will be described in detail.

  In the following, for convenience of explanation, the rotating shaft 30 of the central working unit 10C is referred to as a first rotating shaft 102, and the rotating shaft 30L of the extension working unit left 10L is referred to as a second rotating shaft 104. In addition, the driving side clutch 31C of the central working unit 10C is referred to as a first clutch 106, and the driven side clutch 31L of the extension working unit left 10L is referred to as a second clutch 108.

  FIG. 6 is a side view illustrating the configuration of the clutch device 100 according to the present embodiment. FIG. 6A is a side view illustrating the clutch device 100 in a state in which the first clutch 106 and the second clutch 108 are engaged with each other when the agricultural machine 10 is in the deployed state. FIG. 6B is a side view for explaining the clutch device 100 in a state where the extension work portion left 10L of the agricultural work machine 10 is rotated upward and the first clutch 106 and the second clutch 108 are separated. In these drawings, a hatched area indicates a cross-sectional structure on a plane passing through the rotation center of the first rotation shaft 102 or the rotation center of the second rotation shaft 104.

  The clutch device 100 according to the present embodiment includes a first clutch 106, a second clutch 108, and a cushion rubber 110.

  The first clutch 106 is provided at the end of the first rotating shaft 102. In the present embodiment, the end portions of the first clutch 106 and the first rotating shaft 102 are fitted to each other by a spline and further fixed by bolts.

  The second clutch 108 is provided at the end of the second rotating shaft 104. Further, the second clutch 108 is detachably fixed to the end of the second rotating shaft 104.

  In the present embodiment, the second rotating shaft 104 has a clutch base 104a. The clutch base 104a is fitted to one end of the second rotating shaft 104 by a spline, and is further fixed by a bolt. The clutch base 104 a is provided with a holder 104 b for mounting the tilling claw 32.

  As will be described in detail later, the second clutch 108 is provided with a plurality of bolt insertion holes on the second rotating shaft 104 side, and is fixed to the clutch base 104a via the plurality of bolts. As a result, the second clutch 108 is detachably fixed to the second rotating shaft 104 and is configured to rotate together.

  By having such a configuration, only the second clutch 108 can be easily detached. That is, when the second clutch 108 is detached, it is not necessary to remove the tilling claw 32. Furthermore, since it is not necessary to attach the tilling claw 32 directly to the second clutch 108, the restriction on the mechanism for fixing the tilling claw 32 is relaxed. As a result, the mechanism for fixing the plurality of tilling claws 32 can be unified, and the tilling claws 32 fixed to the clutch base 104a can be the same as the other tilling claws 32.

  As a result, maintenance such as replacement of the second clutch 108 and the tilling pawl 32 is facilitated, and maintenance costs can be further reduced.

  Next, the configuration of the first clutch 106 will be described in more detail. FIG. 7 is a diagram illustrating the configuration of the first clutch 106 according to the present embodiment, and (a), (b), and (c) are a top view, a side view, and a cross-sectional view, respectively. Here, in FIG. 7B, one cross section of the plurality of first claw portions 106d is indicated by hatching. Further, in FIG. 7C, a cross section along AOA ′ is indicated by hatching.

  As shown in FIG. 7B, when the first clutch 106 is engaged, the surface facing the second clutch 108 is the first surface 106a, and the surface opposite to the first surface 106a is the second surface 106b. To do.

  The first clutch 106 according to the present embodiment includes a first substrate 106c, a plurality of first claw portions 106d, and an outer peripheral ring 106e. The first substrate 106c has a spline hole. The first clutch 106 is fixed to the end of the first rotation shaft 102 by inserting the first rotation shaft 102 through the spline hole. The plurality of first claw portions 106d are provided outside the first substrate 106c. The outer peripheral ring 106 e is provided outside the plurality of first claw portions 106 d and has a circular outer periphery centered on the rotation center O of the first rotation shaft 102. The outer peripheral ring 106e may be a circle whose outer periphery shape is centered on the rotation center O of the first rotating shaft 102, and the inner peripheral shape thereof is arbitrary. The outline of the outer peripheral ring 106e in plan view corresponds to the outline of the first clutch 106 in plan view.

  In the present embodiment, the plurality of first claw portions 106 d are arranged radially around the first rotation shaft 102. Each of the plurality of first claw portions 106d has one end connected to the first substrate 106c and the other end connected to the outer ring 106e. Accordingly, it can be said that the first clutch 106 has the same number of openings 106f as the first claws 106d.

  Each of the plurality of first claw portions 106d has a protruding tip portion on the first surface 106a side. In the present embodiment, the surface on the first surface 106a side of each of the plurality of first claw portions 106d includes two flat surfaces 106g. The angle formed by these two flat surfaces 106g is 90 °, thereby forming the tip portion.

  Note that the angle formed by the two flat surfaces 106g, that is, the angle of the tip of each of the plurality of first claw portions 106d is not limited to 90 °. However, when the first clutch 106 and the second clutch 108 are engaged with each other, the convex portion functions as a guide. Therefore, if it is too large compared to 90 °, it becomes difficult to smoothly engage. Furthermore, there is a concern that the meshing of both easily separates during rotation. On the other hand, if the angle is too small compared to 90 °, the strength of the plurality of first claw portions 106d is lowered.

  In the present embodiment, the number of first claw portions 106d is eight. All pairs of adjacent first claw portions 106d are equally spaced. The first clutch 106 according to the present embodiment has symmetry with respect to the rotation of 45 ° around the first rotation shaft 102 with respect to the shapes of at least the outer peripheral ring 106e and the eight first claw portions 106d. Furthermore, it has mirror symmetry with respect to the shape of at least the outer peripheral ring 106e and the eight first claw portions 106d.

  In the present embodiment, the number of the first claw portions 106d is eight, but the number is not limited to this. Two or more first claw portions 106d are sufficient. When the number of the first claw portions 106d is n (n is an integer equal to or larger than 2), the first clutch 106 has at least the outer peripheral ring 106e and the n first claw portions 106d with respect to the first rotating shaft 102. It is preferable to have symmetry for a 360 ° / n rotation around the center of rotation O.

  In order to achieve the object of the present invention described above, it is not essential to provide the outer peripheral ring 106e.

  Next, the configuration of the second clutch 108 will be described in more detail. FIG. 8 is a diagram illustrating the configuration of the second clutch 108 according to the present embodiment, and (a), (b), and (c) are a top view, a side view, and a cross-sectional view, respectively. Here, in FIG. 8C, the cross section along AOA ′ is shown by hatching.

  As shown in FIG. 8B, when the second clutch 108 is engaged, the surface facing the first clutch 106 is the first surface 108a, and the surface opposite to the first surface 108a is the second surface 108b. To do.

  The second clutch 108 according to the present embodiment includes a second substrate 108c and a plurality of second claw portions 108d. The second substrate 108 c has a circular outer periphery centered on the rotation center O of the second rotation shaft 104. Further, the second substrate 108 c has a circular opening 108 e centering on the rotation center O of the second rotation shaft 104. The plurality of second claw portions 108d are provided on the first surface 108a side of the second substrate 108c, and are arranged to mesh with the plurality of first claw portions 106d.

  In the present embodiment, the plurality of second claw portions 108 d are arranged along a circumference centering on the rotation center O of the second rotation shaft 104. Accordingly, it can be said that the second clutch 108 has the same number of groove portions 108f as the second claw portions 108d. Each of the plurality of groove portions 108f is formed between the second claw portions 108d adjacent to each other.

  In the present embodiment, the bottom surface shape of each of the plurality of groove portions 108f is a curved surface convex toward the second surface 108b side, but is not limited thereto. For example, the bottom surface shape of the plurality of groove portions 108f may be a flat surface.

  In the present embodiment, the number of the second claw portions 108d is 8, which is the same as the number of the first claw portions 106d. The number of the first claw portions 106d and the second claw portions 108d do not have to be the same, but if the number is the same, the plurality of first claw portions 106d and the plurality of second claw portions 108d each have the most advanced way of wear. It is preferable in that it becomes nearly uniform.

  All pairs of adjacent second claw portions 108d are equally spaced. The second clutch 108 according to the present embodiment has symmetry with respect to the rotation of 45 ° around the second rotation axis 104 with respect to the shape of at least the eight second claw portions 108d. Furthermore, it has mirror symmetry with respect to the shape of at least the eight second claw portions 108d.

  The eight second claw portions 108d have a shape in which the vicinity of the tip portion is tapered. When the first clutch 106 and the second clutch 108 are engaged, the tapered tip functions as a guide.

  The plurality of bolt insertion holes 108g described above are provided on the second surface 108b side of the second substrate 108c. The plurality of bolt insertion holes 108g are provided at locations corresponding to the second claw portions 108d. In the present embodiment, the number of bolt insertion holes 108g is four, and all pairs of adjacent bolt insertion holes 108g are equally spaced. The end portion (clutch base 104a) of the second rotating shaft 104 and the second clutch 108 are fixed with four bolts through bolt insertion holes 108g provided at four locations.

  The second clutch 108 has a locking portion 108h that fixes a cushion rubber 110 described later. In the present embodiment, a step portion that goes around the opening 108e is provided on the side wall of the opening 108e. The step portion functions as a locking portion that restrains the movement of the cushion rubber 110 in the direction of the first surface 108a.

  Next, the configuration of the cushion rubber 110 will be described. FIG. 9 is a diagram illustrating the configuration of the cushion rubber 110 according to the present embodiment, and (a), (b), and (c) are a top view, a side view, and a cross-sectional view, respectively. FIG. 10 is a diagram illustrating a state in which the cushion rubber 110 according to the present embodiment is attached to the second clutch 108, and (a), (b), and (c) are a top view, a side view, and a cross-sectional view, respectively. is there. Here, in FIG. 9C and FIG. 10C, the cross section along AOA ′ is shown by hatching.

  The cushion rubber 110 is disposed inside at least the second claw portions 108d of the second clutch 108. That is, the cushion rubber 110 is disposed along at least the side wall of the opening 108e.

  In the present embodiment, the cushion rubber 110 is annularly disposed inside the plurality of second claw portions 108 d of the second clutch 108. Furthermore, the movement of the cushion rubber 110 in the direction of the first surface 108a is restricted by the locking portion 108h provided in the second clutch 108.

  The cushion rubber 110 according to the present embodiment further includes a plurality of projecting portions 110a extending between the plurality of second claw portions 108d. In other words, each of the plurality of projecting portions 110a extends to the plurality of groove portions 108f. Each of the plurality of protrusions 110a is disposed along a part of the side wall and the bottom of each of the plurality of grooves 108f of the second clutch 108.

  Each of the plurality of protrusions 110a of the cushion rubber 110 includes two flat surfaces 110b and a groove 110c. In the present embodiment, in the state where the first clutch 106 and the second clutch 108 are separated, the angle formed by the two flat surfaces 110b is 101.8 °. The groove part 110c is provided in the approximate center of the protrusion part 110a from the base of the protrusion part 110a to the tip. The groove 110c is provided between the two planes 110b and separates the two planes 110b from each other.

  The cushion rubber 110 is made of an elastic material. As the material having elasticity, for example, rubber, resin, sponge, or the like can be used. When the cushion rubber 110 is replaced, the cushion rubber 110 is configured so that it can be easily attached to and detached from the second clutch 108 by being manually deformed.

  FIG. 11 is a side view illustrating a state in which the first clutch 106 and the second clutch 108 according to the present embodiment are engaged with each other. Here, in FIG. 11, one cross section of the plurality of first claw portions 106d is indicated by hatching.

  The eight first claw portions 106d of the first clutch 106 and the eight second claw portions 108d of the second clutch 108 mesh with each other. In other words, each of the eight first claw portions 106d of the first clutch 106 and each of the eight groove portions 108f of the second clutch 108 are fitted. In other words, each of the eight openings 106f of the first clutch 106 and the eight second claws 108d of the second clutch 108 are fitted. Accordingly, the relative rotation around the rotation axis of the first clutch 106 and the second clutch 108 is constrained.

  In the present embodiment, the eight first claw portions 106d of the first clutch 106 and the eight second claw portions 108d of the second clutch 108 mesh with each other. Here, the cushion rubber 110 is interposed between the first clutch 106 and the second clutch 108, so that the top portions of the eight first claw portions 106 d of the first clutch 106 do not contact the second clutch 108. The top portions of the eight first claw portions 106d of the first clutch 106 do not need to contact the second clutch 108, and the side portions of the eight first claw portions 106d of the first clutch 106 are the second clutch. 108 may be contacted. In the present embodiment, during rotation, the side portions of the eight first claw portions 106d of the first clutch 106 come into contact with the second clutch 108 to transmit the rotation drive.

  As can be seen from FIG. 11, in a side view, the plurality of first claw portions 106d are covered with an outer peripheral ring 106e. Therefore, the plurality of first claw portions 106d are not visually recognized from the outside. That is, particularly during the farm work of only the central working unit 10C in which the farm work machine 10 is folded, the outer peripheral ring 106e of the clutch device 100 according to the present embodiment is mainly exposed to the outside. This makes it difficult for residues such as straw and grass to wrap around the first claw portions 106d. This can prevent the clutch device 100 from being disconnected due to the attached residue when the agricultural machine 10 is set to the unfolded state.

  In the case of the conventional structure which does not have an outer periphery ring, the some 1st nail | claw part 106d is exposed outside during agricultural work. In this case, due to the unevenness caused by the protruding first claw portion 106d, residues such as wrinkles and grass tend to wrap around the clutch device.

  In the present embodiment, the two flat surfaces 106g of each of the plurality of first claw portions 106d are in contact with each of the plurality of protruding portions 110a of the cushion rubber 110.

  The angle formed by the two flat surfaces 110b included in the protrusion 110a of the cushion rubber 110 is 101.8 ° as described above. On the other hand, the angle formed by the two flat surfaces 106g included in the first claw portion 106d is 90 ° as described above. When the first clutch 106 and the second clutch 108 are engaged with each other, the cushion rubber 110 has elasticity, so that almost all the region of the flat surface 110b is deformed so as to contact the two flat surfaces 106g of the first claw portion 106d. The tip end portion of the first claw portion 106d does not contact the cushion rubber 110 because of the groove portion 110c of the protruding portion 110a.

  With such a configuration, the side portions of the plurality of first claw portions 106d included in the first clutch 106 and the second clutch 108 are in contact with each other, but the plurality of first claw portions 106d included in the first clutch 106 are included. And the contact of the plurality of grooves 108f of the second clutch 108 can be avoided. Accordingly, the cushion rubber 110 functions as a cushioning material, and the tops of the plurality of first claw portions 106d of the first clutch 106 and the second clutch 108 of the first clutch 106 caused by vibration in the direction of the first rotation shaft 102 or the second rotation shaft 104 are provided. There is no collision of the first surface 108a. Therefore, it is possible to suppress the occurrence of wear and collision noise.

  Furthermore, by having such a configuration, the pressure between the first clutch 106 and the second clutch 108 does not concentrate on the tops of the plurality of first claw portions 106d. The pressure between the first clutch 106 and the second clutch 108 is almost uniformly distributed on the contact surfaces of the flat surface 110c of the projecting portion 110a and the flat surface 106g of the first claw portion 106d. As a result, rattling of the first clutch 106 and the second clutch 108 can be mitigated, and the occurrence of wear and collision noise due to their collision can be suppressed.

  Furthermore, by having such a configuration, the arrangement of the plurality of first claw portions 106d in the rotation direction with respect to the second clutch 108 is most stable in the arrangement at the time of meshing. That is, due to the shape of the contact surface between each of the two flat surfaces 106g of each of the plurality of first claw portions 106d and each of the plurality of protrusions 110a of the cushion rubber 110, the plurality of first claw portions 106d have an external force in the rotational direction. When receiving, a repulsive force against the external force is received from the cushion rubber 110. As a result, it is possible to suppress the occurrence of wear and collision noise due to the collision of the first clutch 106 and the second clutch 108 caused by acceleration or deceleration in the rotational direction.

  In order to suppress wear and collision noise due to the collision of the first clutch 106 and the second clutch 108, it is preferable to increase the area where the first clutch 106 and the cushion rubber 110 are in contact with each other as much as possible. According to the present embodiment, by providing the cushion rubber 110 with the plurality of protrusions 110a, the area where the first clutch 106 and the cushion rubber 110 come into contact can be increased as much as possible.

  Further, by having such a configuration, a gap is formed by the tip end portion of the first claw portion 106d and the groove portion 110c of the protruding portion 110a. Accordingly, mud that has entered the inside of the clutch device 100 can be discharged to the outside through the gap.

  The angle formed by the two flat surfaces 110b included in the protrusion 110a of the cushion rubber 110 is not limited to 101.8 °. What is necessary is just to design so that the press between the 1st clutch 106 and the 2nd clutch 108 may be disperse | distributed as uniformly as possible on the contact surface of the plane 110c which the protrusion part 110a has, and the plane 106g which the 1st nail | claw part 106d has.

  Even if the cushion rubber 110 does not have a plurality of protrusions 110a, it suppresses the generation of wear and collision noise due to the collision of the first clutch 106 and the second clutch 108 due to acceleration or deceleration in the rotational direction. Is possible. The cushion rubber 110 may be arranged in an annular shape at least inside the second claw portions 108d of the second clutch 108.

  At this time, the top portion of the cushion rubber 110 on the first surface 108a side of the second clutch 108 may be disposed closer to the first surface 108a side of the second clutch 108 than the bottom portions of the plurality of groove portions 108f. That is, in a state where the first clutch 106 and the second clutch 108 are engaged with each other, the top portions of the plurality of claw portions 106d of the first clutch 106 and the first surface 108a of the second clutch 108 may not contact each other.

  Furthermore, at this time, the first clutch 106 and the second clutch 108 need to apply a pressure in a direction that attracts each other. That is, in a state where the first clutch 106 and the second clutch 108 are engaged and pressed in the pulling direction, the top portions of the plurality of claw portions 106d of the first clutch 106 and the first surface 108a of the second clutch 108 are mutually connected. If it does not touch, it is good.

  By having such a configuration, the vicinity of the joint portion between the plurality of first claw portions 106d and the first substrate 106c contacts the cushion rubber 110 and bites into it. Thus, when the plurality of first claw portions 106d receive an external force in the rotation direction, the cushion rubber 110 receives a repulsive force against the external force. As a result, it is possible to suppress the occurrence of wear and collision noise due to the collision of the first clutch 106 and the second clutch 108 caused by acceleration or deceleration in the rotational direction.

  The clutch device 100 according to the present embodiment has been described above. According to the clutch device 100 according to the present embodiment, a mechanism for fixing a plurality of tilling claws is unified, facilitating maintenance of the tilling claws and the like, and suppressing generation of wear and collision noise due to collision between claws. It is possible to provide a clutch device and a farm work machine 10 using the clutch device.

  Further, in the present embodiment, the farm work machine 10 for the scraping work has been exemplified and described. However, the clutch device 100 according to the present embodiment is not limited to this, and can also be applied to a farm working machine for plowing and leveling work.

  Agricultural working machine: 10 Central working part: 10C Extension working part left: 10L Extension working part right: 10R Top mast: 12 Lower link connecting part: 14 Input shaft: 16 Gear box: 18 Transmission frame: 20 Transmission shaft: 21 Support frame: 22 Chain transmission case: 24 Side frame: 26 Tilling rotor: 28 Rotating shaft: 30 Drive side clutch: 31C Driven side clutch: 31L Tillage pawl: 32 Shield cover: 34 Shield cover left: 34L Leveling plate: 42 Link mechanism: 44 Swing arm: 46 Connecting rod: 48 Shaft: 50 Folding shaft: 52 Left hydraulic cylinder: 54L Side frame left: 56L, 57L Extension leveling plate left: 58L Shaft: 60 Turning device: 62 Cover: 64 Drive motor: 66 Link mechanism: 68 Digging plate: 70 Clutch installation Position: 100 First rotation axis: 102 Second rotation axis: 104 Clutch base: 104a First clutch: 106, 206, 306 First surface: 106a, 206a Second surface: 106b, 206b First substrate: 106c First claw Part: 106d, 206d, 306d Outer ring: 106e, 206e, 306e Opening: 106f Plane: 106g Bolt insertion hole: 306h, 306i Second clutch: 108 First surface: 108a Second surface: 108b Second substrate: 108c First 2 claw part: 108d Opening part: 108e Groove part: 108f Bolt insertion hole: 108g Locking part: 108h Cushion rubber: 110 Protruding part: 110a Plane: 110b Groove part: 110c Center of rotation: O

Claims (8)

A first clutch provided at an end of the first rotation shaft and having a plurality of first claw portions;
A second clutch provided at an end portion of the second rotation shaft and having a plurality of second claw portions that mesh with the plurality of first claw portions;
The clutch device, wherein the second clutch is detachably fixed to an end of the second rotating shaft. A cushion rubber disposed at least inside the plurality of second claws of the second clutch and having elasticity;
2. The clutch device according to claim 1, wherein the plurality of first claw portions are in contact with the cushion rubber and mesh with the plurality of second claw portions.   The clutch device according to claim 2, wherein the cushion rubber has a plurality of projecting portions extending between the plurality of second claw portions.   The clutch device according to claim 2, wherein the second clutch has a locking portion that fixes the cushion rubber.   2. The clutch device according to claim 1, wherein the second clutch is detachably fixed to an end of the second rotating shaft via a plurality of bolts.   2. The clutch device according to claim 1, wherein the plurality of first claw portions are radially arranged around the first rotation axis.   The clutch device according to claim 6, wherein the plurality of second claw portions are disposed along a circumference centering on a rotation center of the second rotation shaft.   An agricultural machine comprising the clutch device according to any one of claims 1 to 7.