JP6675210B2 - Clutch device and agricultural work machine - Google Patents

Description

  The present invention relates to a clutch device that engages with pawls provided at each end of a pair of rotating shafts to transmit rotational power, and an agricultural work machine using the same.

  BACKGROUND ART A farming machine mounted on a rear portion of a tractor so as to be able to move up and down via a three-point link hitch mechanism has a tilling rotor to which a plurality of tilling claws are attached, and the tilling rotor is rotated by transmitting power from the tractor.

  Some agricultural work machines have a three-part structure including a central work part and extension work parts rotatably attached to the left and right ends of the central work part in a vertical direction. In the agricultural working machine having such a structure, the tilling rotor of the central working unit is rotated by 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 the respective ends of the tillage rotors of the central working unit and the extension working unit and mesh with each other.

  For example, in Patent Literature 1, a protrusion protruding annularly on a substrate inside a claw portion of a dog clutch provided on one of a pair of rotation shafts and a rotation shaft on the other of the pair of rotation shafts A leaf spring member made of a metal material, which is provided on the substrate inside the claw portion of the provided dog clutch and is elastically deformed by being pushed by the projection portion in a state where the claw portions of the pair of dog clutches are engaged with each other. A dog clutch device characterized by the above is disclosed.

JP 2010-196748 A

  In the configuration of the above-mentioned patent document, the plurality of claw portions of the dog clutch provided on the one rotation shaft are provided to protrude outward. In such a configuration, residues such as grass and straw are easily wound around the dog clutch by the rotation of the one rotation shaft. If such a residue wraps around the dog clutch, it may be a factor that hinders smooth connection and disconnection of the dog clutch device.

  The present invention has been made in view of the above circumstances, and has an object to provide a clutch device and a farm work machine using the same, in which residues such as grass and straw are prevented from wrapping around a dog clutch, and can be smoothly connected and separated. I do.

  A clutch device according to an embodiment of the present invention includes a first clutch provided at an end of a first rotation shaft and having a plurality of first claws, and a plurality of first clutches provided at an end of a second rotation shaft. A second clutch having a plurality of second claws arranged so as to mesh with the claws, wherein the first clutch is provided around the rotation center of the first rotation shaft outside the plurality of first claws. It is characterized by further having a circular outer ring.

  An agricultural working machine according to one embodiment of the present invention includes the above-described clutch device.

  According to the present invention, it is possible to provide a dog clutch device capable of suppressing a residue such as grass and straw from wrapping around a dog clutch and enabling smooth connection and separation, and an agricultural work machine using the same.

It is a perspective view of the deployment state explaining the composition of the agricultural working machine concerning one embodiment of the present invention. It is an upper surface figure of the deployment state explaining the composition of the agricultural working machine concerning one embodiment of the present invention. It is a side view of the deployment state explaining the composition of the agricultural working machine concerning one embodiment of the present invention. It is a perspective view of the folding state explaining the composition of the agricultural working machine concerning one embodiment of the present invention. It is a side view of the folding state explaining the composition of the agricultural working machine concerning one embodiment of the present invention. FIG. 2 is a side view in a folded state illustrating a configuration of the clutch device according to the embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration of a first clutch according to one embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration of a second clutch according to one embodiment of the present invention. It is a figure explaining composition of a cushion rubber concerning one embodiment of the present invention. It is a figure explaining the state where the cushion rubber concerning one embodiment of the present invention was attached to the 2nd clutch. It is a side view explaining the state where the 1st clutch and the 2nd clutch concerning one embodiment of the present invention meshed mutually. It is a side view explaining the state where the 1st clutch and the 2nd clutch concerning a modification of the present invention meshed mutually. FIG. 9 is a diagram illustrating a configuration of a first clutch according to a modification of the present invention.

<First embodiment>
Before giving a detailed description of the clutch device 100 according to the present embodiment, a schematic configuration of a farm working machine 10 that can include the clutch device 100 will be described. In the present embodiment, a description will be given of an example of the agricultural working machine 10 particularly for a scraping operation. However, the configuration of the clutch device 100 described below is not limited to this, and can be applied to an agricultural work machine for tilling 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. FIGS. 1, 2, and 3 are a perspective view, a top view, and a side view, respectively, in an unfolded state for explaining the configuration of the agricultural working machine 10 according to the present embodiment. FIG. 4 and FIG. 5 are a perspective view and a side view in a folded state illustrating 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 arranged at the center of the agricultural working machine 10. The extension working unit left 10L and the extension working unit right 10R are disposed at the left and right ends of the central working unit 10C.

  Each of the extension work unit left 10L and the extension work unit right 10R can be turned up and down around a front and rear direction folding shaft 52 which is a rotation fulcrum provided at both left and right ends of the central work unit 10C. It has become. The extension working unit left 10L and the extension working unit right 10R are selectively switched to an expanded state or a 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 tillage rotor 28, a shield cover 34, a leveling plate 42, and a link mechanism. And a portion 44.

  The top mast 12 and the lower link connecting portion 14 are provided at a front central portion and two front left and right portions of the central working portion 10C, respectively. The top mast 12 and the lower link connecting portions 14 provided at the left and right two places are connected to the top link of the tractor (not shown) and the lower links (three-point link hitch mechanism) provided at the two left and right places, respectively. It is attached to the rear of the tractor so as to be able to move up and down.

  The input shaft 16 is provided inside a gear box 18 provided at the front center of the central working unit 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 configuration of the central working unit 10C of the agricultural working machine 10 according to the present embodiment will be described. The transmission frame 20 and the support frame 22 also serve as a main body frame, and extend horizontally on both left and right sides of the gear box 18. The transmission frame 20 houses a transmission shaft 21 (not shown). The support frame 22 may be hollow without the transmission shaft 21 inside. A chain transmission case 24 is suspended from a side end of the transmission frame 20, and a side frame 26 is suspended from a side end 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 rotation shaft 30 is suspended between the lower end of the chain transmission case 24 and the lower end of the side frame 26. The drive-side clutch 31C is provided at both ends of the rotating shaft 30. Although the 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-side 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 axis of the rotating shaft 30, and the tilling claws 32 may be inserted into the holders and fixed with bolts. The power transmitted from the tractor to the input shaft 16 is shifted in the gear box 18, rotates the transmission shaft 21 to rotate the rotation shaft 30 via the chain transmission case 24, and rotates the tilling rotor 28 in a predetermined direction. It is configured to perform the tilling work.

  The shield cover 34 is disposed between the transmission frame 20 and the lower portion of 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 ground plate 42a is attached to the rear end of the shield cover 34 so as to be rotatable in the vertical direction, and the rear side extends obliquely downward. The tillable ground is leveled flat by the rear end of the first leveling plate 42a. The second leveling plate 42b is attached to the rear end of the first leveling plate 42a, and is attached to the rear end of the first leveling plate 42a so as to be vertically rotatable. The tilling ground of the field is further leveled by the second leveling plate 42b.

  The link mechanism 44 has one end connected to the rear of the gear box 18 and the other end connected to the upper surface of the second leveling plate 42b. The link mechanism 44 is vertically movable with the vertical rotation of the second ground plate 42b. In the present embodiment, the link mechanism section 44 includes a swing arm 46 and a connecting rod 48.

  One end of the swing arm 46 is rotatably connected to the rear portion of the gear box 18, and the other end extends rearward in the machine body traveling direction and can swing vertically. Here, one end of the swing arm 46 is rotatably connected to a rear portion of the gear box 18 by using a shaft 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 ground plate 42b. That is, the swing arm 46 is connected to the second ground plate 42b via the connecting rod 48. Both ends of the connecting rod 48 are rotatably connected to the swing arm 46 and the second ground plate 42b. Therefore, when the second ground plate 42b rotates in the vertical direction, the swing arm 46 rotates in the vertical direction through the connecting rod 48 with the shaft portion 50 as a rotation fulcrum.

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

  The extension working unit left 10L includes a left hydraulic cylinder 54L, two left side frames 56L and 57L, a cultivating rotor 28L, a shield cover left 34L, and a ground plate left 42L.

  The left hydraulic cylinder 54L functions as a left rotation drive unit as a drive source for rotating the extension working unit left 10L with respect to the central working unit 10C based on the expansion and contraction operation. The extension working unit left 10L is positioned outside of the central working unit 10C by rotating a predetermined angle in the deployment direction about the folding shaft 52, for example, approximately 180 degrees, based on the operation of the left hydraulic cylinder 54L. Then, by turning a predetermined angle about the folding shaft 52 in the folding direction, for example, about 180 degrees, the folding position is reached above the central working unit 10C.

  The left side frames 56L and 57L are provided at the left and right ends of the extension working unit left 10L.

  The tillage rotor 28L is rotatably supported between lower portions of the left side frames 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, like the tilling rotor 28 provided in the central working unit 10C. The driven clutch 31L is provided at one end of the rotation shaft 30L. Although the details will be described later, the driven side clutch 31L is engaged with the drive side clutch 31C provided on the central working portion 10C side in the deployed state, so that the rotation power is supplied from the central working portion 10C side.

  The left shield cover 34L is provided between the upper portions of the left side frames 56L and 57L so as to cover the tillage 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 left grading plate 42L includes a first grading plate left 42La and a second grading plate left 42Lb, like the grading plate 42 provided in the central working unit 10C.

  The configuration of the extension working unit left 10L in the direction of the rotation shaft 30L (not shown) of the tilling rotor 28L is substantially the same as the configuration of the central working unit 10C. That is, in a cross section on a plane orthogonal to the rotation axis 30L of the cultivation rotor 28L, the cross-sectional configurations of the rotation axis 30L of the cultivation rotor 28L, the shield cover left 34L, and the ground leveling plate left 42L 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 transmitted to the tillage rotor 28 of the central working unit 10C via the transmission mechanism described above, together with the tillage provided on the extended working unit left 10L and the extended working unit right 10R. 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 ground plate left 58L is provided at the outer end of the second ground plate left 42Lb so as to be vertically rotatable. The extended leveling plate left 58L is provided rotatably about a shaft portion 60 extending in the front-rear direction at the left-right outer end of the second leveling plate left 42Lb. The extended leveling plate left 58L extends outside the second leveling plate left 42Lb in the unfolded work position to assist the leveling operation of the second leveling plate left 42Lb, and is folded above the second leveling plate left 42Lb. When it is turned to the (storage position), it is stored on the second ground plate left 42Lb.

  The extension ground plate left 58L can be further rotated between the storage position and the work position by a rotation device 62 provided on the shield cover left 34L of the extension work unit left 10L. The rotation device 62 is connected between a drive motor 66 (not shown) covered by the cover 64 and the drive motor 66 and the left extension ground plate 58L. And a link mechanism 68 for rotating 58L.

  The configuration of the extension working unit left 10L has been described above. The configuration of the extension working unit right 10R is almost the same as that of the extension working unit left 10L. For the reference numerals used in the description, L may be read as R.

  The agricultural working machine 10 may further include a plurality of earth approaching plates 70. The plurality of mulch plates 70 are attached to the front of the agricultural work machine 10. For example, when a tire mark of a traveling tractor is formed on the cultivated ground and the soil is offset, the eccentricity of the soil can be returned by the mulling plate 70 to flatten the cultivated ground.

  As above, 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 unit left 10L and the extension work unit right 10R have a structure that is substantially horizontally symmetrical with respect to each other, the extension work that engages with the drive side clutch 31C of the center work unit 10C and the drive side clutch 31C of the center work unit 10C will be described below. The configuration of the driven-side clutch 31L of the left side 10L will be described in detail.

  Hereinafter, 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 extended working unit left 10L is referred to as a second rotating shaft 104. Further, the drive 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 extended working unit 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 where the first clutch 106 and the second clutch 108 are engaged in the deployed state of the agricultural work machine 10. FIG. 6B is a side view illustrating the clutch device 100 in a state where the extension working unit left 10L of the agricultural work machine 10 rotates 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.

  In order to achieve the object of the present invention, it is not essential to provide the cushion rubber 110.

  The first clutch 106 is provided at an end of the first rotating shaft 102. In the present embodiment, the ends of the first clutch 106 and the first rotating shaft 102 are fitted with each other by splines, and are further fixed by bolts.

  The second clutch 108 is provided at an end of the second rotating shaft 104. Further, the second clutch 108 is detachably fixed to an 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 bolts. The clutch base 104a is provided with a holder 104b for mounting the tilling claw 32.

  Although details will be described later, the second clutch 108 has a plurality of bolt insertion holes provided 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 integrally.

  With such a configuration, only the second clutch 108 can be easily detached. That is, when the second clutch 108 is detached, the tillage claw 32 does not need to be detached. Further, since it is not necessary to directly attach the tilling claw 32 to the second clutch 108, the limitation of the mechanism for fixing the tilling claw 32 is eased. Thus, the mechanism for fixing the plurality of tilling claws 32 can be unified, and the same tilling claws 32 as the other tilling claws 32 can be used as the tilling claws 32 fixed to the clutch base 104a.

  Accordingly, maintenance such as replacement of the second clutch 108 and the tillage claw 32 is facilitated, and the maintenance cost 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 oblique lines. Further, in FIG. 7C, a cross section along AOA 'is shown by oblique lines.

  As shown in FIG. 7B, the first clutch 106 has a first surface 106a on the side facing the second clutch 108 at the time of engagement, and a second surface 106b on the side opposite to the first surface 106a. I do.

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

  In the present embodiment, the plurality of first claw portions 106d are radially arranged around the first rotation axis 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 peripheral ring 106e. Thus, 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 tip that is convex toward the first surface 106a. 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 between these two planes 106g is 90 °, thereby forming the tip.

  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. Furthermore, there is a concern that the engagement of the two may be easily separated 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 will decrease.

  In the present embodiment, the number of the first claw portions 106d is eight. Adjacent pairs of the first claw portions 106d are all equally spaced. The first clutch 106 according to the present embodiment has at least the shape of the outer peripheral ring 106e and the eight first claw portions 106d symmetry with respect to the rotation around the first rotation axis 102 by 45 °. Furthermore, at least the outer ring 106e and the eight first claw portions 106d have mirror symmetry in shape.

  In the present embodiment, the number of the first claw portions 106d is eight, but the number is not limited to eight. It is sufficient that the number of the first claw portions 106d is two or more. When the number of the first claw portions 106d is n (n is an integer of 2 or more), the first clutch 106 has at least the outer peripheral ring 106e and the n first claw portions 106d. It preferably has a symmetry for a rotation of 360 ° / n about the center of rotation O.

  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, a cross section along AOA 'is shown by oblique lines.

  As shown in FIG. 8B, the second clutch 108 has a first surface 108a on the side facing the first clutch 106 during engagement, and a second surface 108b on the side opposite to the first surface 108a. I do.

  The second clutch 108 according to the present embodiment has a second substrate 108c and a plurality of second claws 108d. The second substrate 108c has a circular outer circumference centered on the rotation center O of the second rotation shaft 104. The second substrate 108c has a circular opening 108e centered 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 so as to mesh with the plurality of first claw portions 106d.

  In the present embodiment, the plurality of second claw portions 108d are arranged along a circumference around the rotation center O of the second rotation shaft 104. Thus, it can be said that the second clutch 108 has the same number of grooves 108f as the second claws 108d. Each of the plurality of grooves 108f is formed between the adjacent second claw portions 108d.

  In the present embodiment, the bottom surface of each of the plurality of grooves 108f is a curved surface that is convex toward the second surface 108b, but is not limited to this. For example, the bottom shape of the plurality of grooves 108f may be flat.

  In the present embodiment, the number of the second claws 108d is 8, which is the same as the number of the first claws 106d. The number of the first claw portions 106d and the second claw portions 108d does not need to be the same, but if the number is the same, the plurality of the first claw portions 106d and the plurality of the second claw portions 108d are each the most worn. This is preferable because it is close to uniform.

  Adjacent pairs of the second claw portions 108d are all equally spaced. The second clutch 108 according to the present embodiment has symmetry with respect to at least the shape of the eight second claw portions 108d with respect to the rotation around the second rotation axis 104 by 45 °. Further, at least eight second claws 108d have mirror symmetry with respect to the shape.

  The eight second claw portions 108d have a shape in which the vicinity of the distal end portion is tapered. When the first clutch 106 and the second clutch 108 are engaged, the tapered distal end 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 the bolt insertion holes 108g is four, and the pairs of the adjacent bolt insertion holes 108g are all equally spaced. The end (clutch base 104a) of the second rotating shaft 104 and the second clutch 108 are fixed by four bolts by the bolt insertion holes 108g provided at four places.

  The second clutch 108 has a locking portion 108h for fixing a cushion rubber 110 described later. In the present embodiment, a stepped portion surrounding the opening 108e is provided on the side wall of the opening 108e. The step portion functions as a locking portion that restricts 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. FIGS. 10A and 10B are diagrams illustrating a state in which the cushion rubber 110 according to the present embodiment is mounted on the second clutch 108. FIGS. 10A, 10B, and 10C are a top view, a side view, and a cross-sectional view, respectively. is there. Here, in FIG. 9C and FIG. 10C, a cross section along AOA ′ is indicated by oblique lines.

  The cushion rubber 110 is arranged inside at least a plurality of second claws 108d of the second clutch 108. That is, the cushion rubber 110 is arranged at least along the side wall of the opening 108e.

  In the present embodiment, the cushion rubber 110 is annularly arranged inside the plurality of second claws 108d 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 on the second clutch 108.

  The cushion rubber 110 according to the present embodiment further has a plurality of protruding portions 110a extending between each of the plurality of second claw portions 108d. In other words, each of the plurality of protrusions 110a is extended to the plurality of grooves 108f. Each of the plurality of protrusions 110a is disposed along a part and the bottom of each side wall 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, when the first clutch 106 and the second clutch 108 are separated, the angle formed by the two planes 110b is 101.8 °. The groove 110c is provided substantially at the center of the protrusion 110a from the base to the tip of the protrusion 110a. 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 a material having elasticity. As the material having elasticity, for example, rubber, resin, sponge, or the like can be used. At the time of replacement of the cushion rubber 110, the cushion rubber 110 is configured to be easily attached to and detached from the second clutch 108 by being deformed manually.

  FIG. 11 is a side view illustrating a state where 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 oblique lines.

  The eight first claws 106d of the first clutch 106 and the eight second claws 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 fits with the eight second claws 108d of the second clutch 108. Thereby, the relative rotation of the first clutch 106 and the second clutch 108 around the rotation axis is restricted.

  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 are engaged with each other. Here, since the cushion rubber 110 is interposed between the first clutch 106 and the second clutch 108, the tops of the eight first claws 106d of the first clutch 106 do not contact the second clutch 108. It is sufficient that the tops of the eight first pawls 106d of the first clutch 106 do not contact the second clutch 108, and the sides of the eight first pawls 106d of the first clutch 106 are the second clutches. 108 may be contacted. In the present embodiment, during rotation, the drive of rotation is transmitted by the sides of the eight first claws 106 d of the first clutch 106 contacting the second clutch 108.

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

  In the case of the conventional configuration having no outer ring, the plurality of first claw portions 106d are exposed to the outside during the agricultural work. In this case, due to the unevenness caused by the protruding first claw portion 106d, residues such as straw and grass easily wind 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 protrusions 110a of the cushion rubber 110.

  The angle formed by the two planes 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, the cushion rubber 110 has elasticity, so that almost the entire area of the plane 110b is deformed so as to contact the two planes 106g of the first claw 106d. The tip of the first claw 106d does not contact the cushion rubber 110 due to the groove 110c of the protrusion 110a.

  With such a configuration, the side portions of the plurality of first claw portions 106d of the first clutch 106 are in contact with the second clutch 108, but the plurality of first claw portions 106d of the first clutch 106 are in contact with each other. Can be prevented from contacting with the plurality of grooves 108f of the second clutch 108. Therefore, the cushion rubber 110 functions as a cushioning material, and the tops of the plurality of first claws 106 d 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. No collision of the first surface 108a occurs. Therefore, it is possible to suppress the occurrence of wear and collision noise due to this.

  Furthermore, by having such a configuration, pressing 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 surface between the flat surface 110c of the protrusion 110a and the flat surface 106g of the first claw 106d. As a result, the rattling of the first clutch 106 and the second clutch 108 can be reduced, and the occurrence of wear and collision noise due to the collision can be suppressed.

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

  In order to suppress the occurrence of wear and collision noise due to the collision between the first clutch 106 and the second clutch 108, it is preferable that the area where the first clutch 106 and the cushion rubber 110 come into contact is made as large as possible. According to the present embodiment, by providing the plurality of protrusions 110a on the cushion rubber 110, the area where the first clutch 106 and the cushion rubber 110 contact each other can be maximized.

  Furthermore, by having such a configuration, a gap is formed by the tip of the first claw 106d and the groove 110c of the protrusion 110a. Thus, the mud that has entered the inside of the clutch device 100 can be released to the outside through the gap.

  The angle formed by the two planes 110b included in the protrusion 110a of the cushion rubber 110 is not limited to 101.8 °. The pressing between the first clutch 106 and the second clutch 108 may be designed to be distributed as uniformly as possible on the contact surface between the flat surface 110c of the projection 110a and the flat surface 106g of the first claw 106d.

  In addition, even if the cushion rubber 110 does not have the plurality of protrusions 110a, it is possible to suppress the generation of the abrasion and the collision noise due to the collision of the first clutch 106 and the second clutch 108 due to the acceleration or deceleration in the rotation direction. Is possible. The cushion rubber 110 only needs to be annularly arranged at least inside the plurality of second claws 108d of the second clutch 108.

  At this time, the top 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 of the second clutch 108 than the bottom of the plurality of grooves 108f. In other words, in the state where the first clutch 106 and the second clutch 108 are engaged, the tops of the plurality of claws 106d of the first clutch 106 and the first surface 108a of the second clutch 108 need not be in contact with each other.

  Further, at this time, it is necessary that the first clutch 106 and the second clutch 108 apply a pressure in a direction to attract each other. That is, in a state where the first clutch 106 and the second clutch 108 are engaged with each other and are pressed in the direction of attracting each other, the tops of the plurality of claws 106d of the first clutch 106 and the first surface 108a of the second clutch 108 No need to touch.

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

  The configuration of the clutch device 100 according to the present embodiment has been described above. According to the configuration of the clutch device 100 according to the present embodiment, it is possible to suppress a residue such as grass or straw from wrapping around the clutch, and to provide a clutch device capable of smoothly connecting and disconnecting and the agricultural work machine 10 using the same. Can be provided.

<Modification 1>
The configuration of the first clutch 106 according to the present modification will be described. FIG. 12 is a side view illustrating a state in which the first clutch 206 and the second clutch 108 according to the present modification are engaged with each other. Here, in FIG. 12, one cross section of the plurality of first claw portions 206d is indicated by oblique lines.

  As a modification, the outer peripheral ring 206e of the first clutch 206 is extended in the direction of the first rotation shaft 102, and the width in the direction of the first rotation shaft 102 is smaller than the width of the plurality of first claw portions 106d in the direction of the first rotation shaft 102. The configuration may be longer than the width. As compared with the first clutch 106 according to the present embodiment shown in FIG. 11, the outer peripheral ring 206e of the first clutch 206 according to the present modified example is extended to the second surface 206b side of the first clutch 206. Then, in a side view in a state where the first clutch 206 and the second clutch 108 are engaged with each other, the second clutch 108 covers the plurality of second claw portions 108d of the second clutch 108.

  With such a configuration, the plurality of second claw portions 108d of the second clutch 108 are covered by the outer peripheral ring 206e in a side view. This makes it more difficult for residues such as straw and grass to wind around the clutch device 100.

<Modification 2>
The configuration of the first clutch 106 according to the present modification will be described. As another modification, the first clutch 306 may be configured such that the outer peripheral ring 306e is detachable. FIGS. 13A and 13B are diagrams illustrating the configuration of the first clutch 306 according to the present modified example. FIGS. It is the top view and sectional drawing in the state where 306e was separated. In each cross-sectional view, a cross-section along AOA 'is indicated by oblique lines.

  In the present modification, the first clutch 306 has a configuration in which the outer peripheral ring 306e is detachable via a plurality of bolts. Specifically, four of the eight first claw portions 306d are provided with bolt insertion holes 306i. Further, four bolt insertion holes 306h are provided in the outer peripheral ring 306e.

  According to the configuration of the present modification, when the outer peripheral ring 306e is worn and reaches the use limit, it is not necessary to replace the first clutch 306, and only the outer peripheral ring 306e needs to be replaced. Thereby, the maintenance cost of the clutch device 100 can be suppressed.

  Further, in the present embodiment, the agricultural working machine 10 particularly 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 be applied to an agricultural work machine for tilling and leveling work.

  Agricultural work machine: 10 Central working unit: 10C Extended working unit left: 10L Extended working unit right: 10R Top mast: 12 Lower link connecting unit: 14 Input shaft: 16 Gear box: 18 Transmission frame: 20 Transmission shaft: 21 Support frame: 22 Chain transmission case: 24 Side frame: 26 Tillage rotor: 28 Rotation axis: 30 Drive side clutch: 31C Driven side clutch: 31L Tillage claw: 32 Shield cover: 34 Shield cover left: 34L Leveling plate: 42 Link mechanism: 44 Swinging arm: 46 Connecting rod: 48 Shaft: 50 Folding shaft: 52 Left hydraulic cylinder: 54L Side frame left: 56L, 57L Extended ground plane left: 58L Shaft: 60 Rotating device: 62 Cover: 64 Drive motor: 66 Link mechanism part: 68 Throwing board: 70 Clutch 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 2 claws: 108d opening: 108e groove: 108f bolt insertion hole: 108g locking part: 108h cushion rubber: 110 projecting part: 110a plane: 110b groove part: 110c rotation center: 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 of the second rotating shaft and having a plurality of second pawls arranged to mesh with the plurality of first pawls;
The first clutch is connected to the first rotation shaft, and is connected to one end of the first claw portion with a first substrate and a rotation center of the first rotation shaft as a center. Further comprising an outer peripheral ring having a circular outer shape connected to the end,
A clutch device, wherein a plurality of through holes are formed by the first substrate, the plurality of first claws, and the outer peripheral ring. 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 of the second rotating shaft and having a plurality of second pawls arranged to mesh with the plurality of first pawls;
The first clutch is connected to the first rotation shaft, and is connected to one end of the first claw portion with a first substrate and a rotation center of the first rotation shaft as a center. Further comprising an outer peripheral ring having a circular outer shape detachably connected to the end,
A clutch device, wherein a plurality of through holes are formed by the first substrate, the plurality of first claws, and the outer peripheral ring. The clutch device according to claim 1, further comprising a cushion rubber having a plurality of protrusions extending between each of the plurality of second claw portions. The clutch device according to any one of claims 1 to 3, wherein the plurality of first claw portions are radially arranged around the first rotation axis. The clutch device according to any one of claims 1 to 4 , wherein the plurality of second claw portions are arranged along a circumference around a rotation center of the second rotation shaft. . The outer peripheral ring extends in the first rotation axis direction, and a width in the first rotation axis direction is longer than a width of the plurality of first claw portions in the first rotation axis direction. The clutch device according to any one of claims 1 to 5 . The first teeth may have a distal end portion of the tapered on the side engaged with the second pawl portion,
The clutch device according to any one of claims 1 to 6 , wherein the second claw portion has a tapered tip on a side where the second claw portion meshes with the first claw portion . Agricultural machine having a clutch device according to any one of claims 1 to 7.