Attachment mechanism for rotary implement

Abstract

To enable smooth and highly durable works of attaching various work units to a rotary implement by allowing different work units to be easily attached / detached in a replaceable manner with a simple mechanism with less part count to the rotary shaft of a center-drive rotary implement, and by appropriately protecting a base end part of a rotary shaft when the various work units are attached to the rotary shaft.SOLUTION: An attachment mechanism includes: a surrounding wall part surrounding a whole periphery of a base end part of the rotary shaft; and an attachment member interposed between the rotary shaft and a rotation shaft of the work unit and integrally rotates the rotary shaft and the rotation shaft. The attachment member includes a flange part provided in a recess of the surrounding wall part on one end side and a tip end cover part covering a tip end of the rotary shaft on the other end side, and has a cylindrical body having an insertion hole into which the rotary shaft is inserted. On a lateral side of the cylindrical body, a fixing hole is formed through which a fixing member for fixing the rotary shaft and the work unit via the cylindrical body can be penetrated.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an attachment mechanism for a rotary working machine, and more particularly to an attachment mechanism for detachably attaching a working unit to a rotary shaft of a center drive type rotary working machine.

Background Art

[0002] Conventionally, a rotary working machine is directly mounted on the rear part of a riding type or walking type tractor, and a rotary shaft is rotationally driven by the power of the tractor. At this time, a rotary working machine provided with a transmission case for transmitting the power of the tractor to the rotary shaft at the center of the rotary working machine is called a center drive type rotary working machine (see, for example, Patent Document 1 below).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] A center drive type rotary working machine is generally directly mounted on a riding type tractor or a walking type tractor with low horsepower (for example, 20 horsepower or less). Such a rotary working machine is often used as a working machine limited to tilling work. From the viewpoint of reducing the agricultural machinery cost of farmers, it is effective to enable such a low horsepower driven rotary working machine to be used as another working machine such as a management machine, and an attachment mechanism for this purpose has been demanded.

[0005] In addition, when performing mowing work by attaching a work unit such as a rotary for mowing to the rotary shaft of a center drive type rotary work machine, there was a problem that grass and the like were likely to get entangled at the base end of the rotary shaft. Also, in any case where a work unit was attached and work was performed, there was a problem that objects such as grass, strings, and dust hit the oil seal attached to the base end of the rotary shaft, or objects such as grass and strings were wound around the oil seal. Therefore, when attaching various work units to the rotary shaft of a conventional center drive type rotary work machine, it has been required to protect the base end of the rotary shaft in order to suppress the problem of entanglement of grass and the like and prevent objects from hitting or winding around the oil seal.

[0006] Furthermore, when attaching a work unit to the rotary shaft, generally, a bolt is inserted in the rotational axis direction inside the rotational axis of the work unit, and the bolt is fastened to the end of the rotary shaft to fix the rotary shaft and the work unit. However, since the length of the rotational axis varies depending on the type of work unit, and the length of the bolt also varies according to the length of the rotational axis, it is necessary to prepare bolts of different lengths for each work unit, resulting in a large number of parts when exchanging work units and making the replacement work complicated.

[0007] An object of the present invention is to address such circumstances. That is, the present invention aims to enable different work units to be easily detachably exchanged with a simple mechanism having a small number of parts on the rotary shaft of a center drive type rotary work machine, and to appropriately protect the base end of the rotary shaft when various work units are attached to the rotary shaft of the center drive type rotary work machine, and to enable the work performed by attaching various work units to the rotary work machine to be carried out smoothly and with high durability, etc.

Means for Solving the Problems

[0008] In order to solve such problems, the attachment mechanism of the rotary working machine of the present invention is an attachment mechanism for detachably attaching different working units to the rotary shaft of a center drive type rotary working machine, and includes a surrounding wall portion that surrounds the entire circumference of the base end portion of the rotary shaft, and an attachment member that is interposed between the rotary shaft and the rotation shaft of the working unit and rotates integrally with the rotary shaft and the rotation shaft. The attachment member has a flange portion disposed in a recess of the surrounding wall portion on one end side, a tip cover portion that covers the tip of the rotary shaft on the other end side, and is a cylindrical body having an insertion hole into which the rotary shaft is inserted. A fixing hole through which a fixing member for fixing the rotary shaft and the working unit via the cylindrical body can pass is formed in a side portion of the cylindrical body.

Advantages of the Invention

[0009] According to the present invention, different working units can be easily detachably exchanged with a simple mechanism having a small number of parts on the rotary shaft of a center drive type rotary working machine. Also, when various working units are attached to the rotary shaft of the center drive type rotary working machine, the base end portion of the rotary shaft can be appropriately protected, and the work performed by attaching various working units to the rotary working machine can be carried out smoothly and with high durability.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0011] Hereinafter, embodiments (the present embodiment) of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an attachment mechanism 1 of a rotary working machine according to the present embodiment detachably attaches different working units to a rotary shaft 101 of a center drive type rotary working machine (hereinafter, also simply referred to as a "rotary working machine") 100.

[0012] Examples of the working unit include, for example, a mowing rotor (spiral rotor) 200 (FIG. 1) for mowing grass on the ground, a tilling rotor 300 (FIG. 4) for tilling the soil, a ridging rotor 400 (FIG. 5) for forming ridges (raising furrows) in a field, etc., but are not limited thereto, and other working units may also be used. In the present embodiment, in order to use the rotary working machine 100 as a management machine for performing grass mowing work (mowing work), an example in which a mowing rotor 200, which is an example of a working unit, is attached to the rotary shaft 101 of the rotary working machine 100 will be mainly described in the attachment mechanism 1.

[0013] In this embodiment, as shown in FIGS. 1 to 6, the central axis of the central hole 11a in the partition wall portion 11, the central axis of the short-side cross section of the rotary shaft 101, the central axis of the short-side cross section of the insertion hole 15a in the attachment member 12, the central axis of the bolt 16, and the central axis (axis) of the rotation shaft 201 of the grass cutting rotor 200, the central axis of the rotation shaft 301 of the tilling rotor 300, the central axis of the rotation shaft 401 of the ridge forming rotor 400, the central axes of the bolts 501 to 503, the central axis (axis) of the rotation shaft 601 of the conventional grass cutting rotor 600, the central axis of the rotation shaft 701 of the conventional tilling rotor 700, and the central axis of the rotation shaft 801 of the conventional ridge forming rotor 800, which will be described later, are arranged coaxially so as to be a common central axis О with each other.

[0014] Further, in this embodiment, as shown in FIG. 2, the attachment mechanism 1 has a configuration that is symmetric with respect to the transmission case 102 of the rotary working machine 100. Therefore, in this embodiment, the configuration on the right side of the attachment mechanism 1 with respect to the transmission case 102 shown in FIG. 2 and its attachment / detachment operation will be described in detail, and the description of the configuration on the left side of the attachment mechanism 1 with respect to the transmission case 102 shown in FIG. 2 and its attachment / detachment operation will be omitted as appropriate. Also, hereinafter, those without left / right distinction are assumed to be applicable to both the left and right attachment mechanisms 1.

[0015] The rotary working machine 100 is directly mounted on, for example, a ride-on tractor (not shown) with a low horsepower (for example, 20 horsepower or less), but is not limited thereto, and may be directly mounted on, for example, a low horsepower walking tractor (not shown). As shown in FIGS. 1 and 2, the rotary working machine 100 is of a center drive type and includes a symmetric rotary shaft 101 and a transmission case 102. A pair of rotary shafts 101 protrude from both ends in the width direction of the transmission case 102, and a grass cutting rotor 200 is mounted on each rotary shaft 101 via an attachment member 12. Further, the transmission case 102 is formed with attachment portions 103 for attaching the partition wall portion 11 described later at both ends in its width direction.

[0016] Further, the transmission case 102 is filled with oil (lubricating oil) for smoothly operating gears, chains, etc. And, an annular oil seal 104 is provided at the attachment portion 103 (the base end portion 101a of the rotary shaft 101) in the transmission case 102 to seal (seal up) the oil (lubricating oil) in the transmission case 102 and prevent it from leaking to the outside. The oil seal 104 may be made of, for example, synthetic rubber, or a synthetic rubber baked and adhered to a metal ring, but is not limited thereto and may be made of other materials.

[0017] In this rotary working machine 100, the power of an engine (not shown) in a riding tractor or a walking tractor is transmitted to the rotary shaft 101 through gears, chains, etc. in the transmission case 102 to rotate the rotary shaft 101. As the rotary shaft 101 rotates, the mowing rotor 200 attached to the rotary shaft 101 via the attachment member 12 rotates, and the grass on the ground is mowed. The operator operates the riding tractor or the walking tractor to perform field work with this rotary working machine 100, and performs a mowing operation by applying the spiral blade 204 of the mowing rotor 200 to the thick grass on the ground.

[0018] As shown in FIGS. 1 and 2, the mowing rotor 200 includes a rotary shaft 201 attached to the rotary shaft 101 via the attachment member 12, inner support members 202 and outer support members 203 disposed on both axial sides of the rotary shaft 201, and a plurality of spiral blades 204 connected between these inner support members 202 and outer support members 203. The rotary shaft 201 is formed in a hollow cylindrical shape having a shaft hole 201a inside. The inner support members 202 and the outer support members 203 are a pair of support members provided so as to be substantially orthogonal to the central axis О direction of the rotary shaft 201.

[0019] As shown in FIGS. 1 to 3, the attachment mechanism 1 includes a surrounding wall portion 11 that surrounds the entire circumference of the base end portion 101a of the rotary shaft 101 provided in the rotary working machine 100, and is interposed between the rotary shaft 101 and the rotary shaft 201 of the mowing rotor 200, which is an example of a working unit, and includes an attachment member 12 that rotates integrally with the rotary shaft 101 and the rotary shaft 201. Further, the attachment mechanism 1 includes, as an example of a fixing member for fixing the rotary shaft 101 and the working unit via a cylindrical body 15 that constitutes the attachment member 12, a fixing pin 17 and an r-pin 18 that can be inserted into the r-pin hole 17a of the fixing pin 17.

[0020] As shown in FIG. 3, the surrounding wall portion 11 has the rotary shaft 101 passing through its center, and has an annular base portion 11b and an annular recess forming portion 11c formed on the base portion 11b around the entire circumference of the center hole 11a through which the rotary shaft 101 passes. Thereby, a recess 11d having a bottom surface 11e is formed inside the surrounding wall portion 11. The surrounding wall portion 11 may be detachably attached to the attachment portion 103 of the transmission case 102, or may be directly fixed to the attachment portion 103 of the transmission case 102 by welding or the like.

[0021] The attachment member 12 has a flange portion 13 disposed in the recess 11d of the surrounding wall portion 11 on one end side, a tip cover portion 14 that covers the tip of the rotary shaft 101 on the other end side, and is a cylindrical body 15 having an insertion hole 15a into which the rotary shaft 101 is inserted.

[0022] As shown in FIG. 3, the flange portion 13 of the attachment member 12 is disposed within the recess 11d of the surrounding wall portion 11 and has a shape that covers the base end portion 101a of the rotary shaft 101. That is, the flange portion 13 has an annular disk shape extending in a direction substantially perpendicular to the longitudinal direction of the cylindrical body 15 so as to conform to the shape of the recess 11d of the surrounding wall portion 11, and has an outer diameter slightly smaller than the inner diameter of the recess 11d and a thickness (length in the direction of the central axis О) slightly smaller than the depth of the recess 11d. By disposing the flange portion 13 within the recess 11d of the surrounding wall portion 11, the entire circumference of the base end portion 101a of the rotary shaft 101 is covered by the surrounding wall portion 11 and the flange portion 13.

[0023] As a result, when the mowing rotor 200 is attached to the rotary shaft 101 of the rotary working machine 100 for mowing, the base end portion 101a of the rotary shaft 101 is not exposed to the outside, and it is possible to suppress the problem of grass or the like getting entangled there. Further, this prevents objects such as grass, strings, and dust from hitting the oil seal 104 at the base end portion 101a of the rotary shaft 101 or winding around the oil seal 104. Therefore, the base end portion 101a of the rotary shaft 101 including the oil seal 104 can be appropriately protected. That is, the operations performed by attaching various units to the rotary shaft 101 can be carried out smoothly and with high durability.

[0024] The inner diameter shape (hollow cross-sectional shape) of the insertion hole 15a of the cylindrical body 15 constituting the attachment member 12 may be any shape as long as the attachment member 12 and the rotary shaft 101 can rotate integrally. As an example, when the outer diameter shape of the rotary shaft 101 is a polygon such as a hexagon, the inner diameter shape (hollow cross-sectional shape) of the insertion hole 15a may be a polygon such as a hexagon of the same shape. Alternatively, a spline groove or the like (not shown) may be formed on the outer surface of the rotary shaft 101, and a spline protrusion (not shown) engaging with the spline groove or the like may be formed in the insertion hole 15a of the cylindrical body 15.

[0025] The outer diameter shape of the cross section in the short side direction of the cylindrical body 15 that constitutes the attachment member 12 may be any shape as long as the attachment member 12 and the rotation axis 201 of the mowing rotor 200 can rotate integrally. As an example, when the inner diameter shape (hollow cross-sectional shape) of the shaft hole 201a in the rotation axis 201 is a polygon such as a hexagon, the outer diameter shape of the cylindrical body 15 may be a polygon such as a hexagon with the same shape.

[0026] A bolt hole 14a through which a bolt 16 can pass is formed in the tip cover portion 14 of the attachment member 12. In a state where the rotary shaft 101 is inserted into the insertion hole 15a of the cylindrical body 15, the tip cover portion 14 covers the tip 101c of the rotary shaft 101, and the inner surface 14b of the tip cover portion 14 abuts against the tip 101c of the rotary shaft 101. In that state, the tip cover portion 14 is fixed to the tip 101c of the rotary shaft 101 by a bolt 16 passed through the bolt hole 14a. Thereby, the attachment member 12 is in a state of being attached to the rotary shaft 101.

[0027] The length L in the central axis О direction of the cylindrical body 15 that constitutes the attachment member 12 is set so that a gap 11f with a length S in the central axis О direction is formed between the flange portion 13 and the bottom surface 11e of the concave portion 11d in a state where the attachment member 12 is attached to the rotary shaft 101, that is, in a state where the inner surface 14b of the tip cover portion 14 abuts against the tip 101c of the rotary shaft 101 (FIG. 3). Thereby, when the rotary shaft 101 rotates, the attachment member 12 that rotates together with the rotary shaft 101 does not have the flange portion 13 contacting the surrounding wall portion 11, and no friction occurs between the flange portion 13 and the surrounding wall portion 11, so that it rotates smoothly together with the rotary shaft 101.

[0028] As shown in FIG. 3, on the side portion of the rotary shaft 101, a fixing hole 101b is formed which extends in a direction substantially perpendicular to the direction of the central axis О so as to pass through the central axis О and penetrates the rotary shaft 101. Further, on the side portion of the cylindrical body 15 constituting the attachment member 12, two fixing holes 15b symmetric with respect to the central axis О are formed, and on the side portion of the rotary shaft 201 of the mowing rotor 200, two fixing holes 201c symmetric with respect to the central axis О are respectively formed. A fixing pin 17 (fixing member) can penetrate these fixing holes 101b, 15b, 201c in a direction substantially perpendicular to the direction of the central axis О. Near the tip of the fixing pin 17, an r-pin hole 17a through which an r-pin 18 (fixing member) can be inserted is formed.

[0029] When assembling the attachment mechanism 1, that is, when attaching the mowing rotor 200 to the rotary shaft 101 of the rotary working machine 100, the rotary shaft 101 is inserted into the insertion hole 15a of the cylindrical body 15 constituting the attachment member 12. Then, the cylindrical body 15 in that state is inserted into the shaft hole 201a of the rotary shaft 201 of the mowing rotor 200. Thereby, the mowing rotor 200 is attached to the rotary shaft 101 of the rotary working machine 100 via the attachment member 12. Thereafter, the rotary shaft 101, the attachment member 12, and the rotary shaft 201 are fixed by a fixing member such as the fixing pin 17.

[0030] A more specific description will be given of this example of assembling the attachment mechanism 1 (FIGS. 1 to 3). First, the rotary shaft 101 is inserted into the insertion hole 15a of the cylindrical body 15 so as to cover the tip 101c of the rotary shaft 101 of the rotary working machine 100 with the tip cover portion 14. At this time, the inner surface 14b of the tip cover portion 14 is brought into contact with the tip 101c of the rotary shaft 101. In this way, the attachment member 12 is attached to the rotary shaft 101.

[0031] In this attachment, while adjusting the rotational position of the attachment member 12 so that the positions of the fixing holes 15b of the cylindrical body 15 and the fixing holes 101b of the rotary shaft 101 overlap, the attachment member 12 is attached to the rotary shaft 101. When the outer diameter shape of the rotary shaft 101 and the inner diameter shape (hollow cross-sectional shape) of the insertion hole 15a of the cylindrical body 15 are polygons (such as hexagons) of the same shape, it is easy to adjust the rotational position of the attachment member 12 so that the positions of the fixing holes 15b and the fixing holes 101b overlap. Therefore, the attachment member 12 can be easily attached to the rotary shaft 101.

[0032] Thereafter, a bolt 16 with a washer, nut, etc. (not shown) set is passed through the bolt hole 14a of the tip cover portion 14, and the bolt 16 is fastened with a wrench, a spanner, etc. (not shown) to the bolt fixing hole 101d formed at the tip 101c of the rotary shaft 101. In this way, the attachment member 12 attached to the rotary shaft 101 is fixed.

[0033] The attachment member 12 fixedly attached to the rotary shaft 101 has the inner surface 14b of the tip cover portion 14 in contact with the tip 101c of the rotary shaft 101, whereby it is firmly fixed to the rotary shaft 101. And in the state where the attachment member 12 is attached to the rotary shaft 101 in this way, by setting the length L in the direction of the central axis О of the cylindrical body 15 as described above, between the bottom surface 11e of the recess 11d in the surrounding wall portion 11 and the flange portion 13 disposed in the recess 11d, a gap 11f having a length S in the direction of the central axis О is formed. As a result, in this state, the flange portion 13 is configured not to contact the surrounding wall portion 11. When the attachment member 12 and the rotary shaft 101 rotate integrally in this way, by covering the entire circumference of the base end portion 101a of the rotary shaft 101 with the surrounding wall portion 11 and the flange portion 13 disposed in the recess 11d thereof, it is possible to suppress the problem that grass or the like gets entangled with the base end portion 101a of the rotary shaft 101, and since no objects such as grass, strings, or dust hit the oil seal 104 at the base end portion 101a or no objects such as grass or strings are wound around the oil seal, the base end portion 101a of the rotary shaft 101 can be appropriately protected, and since no friction is generated between the flange portion 13 and the surrounding wall portion 11, it rotates smoothly.

[0034] Next, by inserting the cylindrical body 15 of the attachment member 12 fixedly attached to the rotary shaft 101 into the shaft hole 201a of the rotary shaft 201 of the grass cutting rotor 200, the rotary shaft 201 of the grass cutting rotor 200 is attached to the attachment member 12. At this time, while adjusting the position of the rotary shaft 201 in the rotational direction so that the position of the fixing hole 201c of the rotary shaft 201 and the position of the fixing hole 15b of the cylindrical body 15 overlap, the rotary shaft 201 of the grass cutting rotor 200 is attached to the attachment member 12. When the outer diameter shape of the cylindrical body 15 and the inner diameter shape (hollow cross-sectional shape) of the shaft hole 201a of the rotary shaft 201 are the same polygonal shape (such as a hexagon), it is easy to adjust the position of the rotary shaft 201 in the rotational direction so that the position of the fixing hole 201c and the position of the fixing hole 15b overlap, and thus the rotary shaft 201 of the grass cutting rotor 200 can be easily attached to the cylindrical body 15 of the attachment member 12.

[0035] Also, when attaching the rotating shaft 201 of the lawn mowing rotor 200 (i.e., inserting the cylindrical body 15), the tip 201b of the rotating shaft 201 is brought into contact with the disk surface 13a on the side opposite to the side facing the surrounding wall portion 11 in the flange portion 13. Further, in this state, the tip of the head of the bolt 16 passed through the bolt hole 14a of the tip cover portion 14 is locked to the stepped portion 201d of the shaft hole 201a of the rotating shaft 201 (FIG. 3). In this way, the lawn mowing rotor 200 is attached to the rotary shaft 101 via the attachment member 12.

[0036] And in this attached state, a fixing pin 17, which is a fixing member, is passed through the fixing hole 101b of the rotary shaft 101, the fixing hole 15b of the cylindrical body 15 constituting the attachment member 12, and the fixing hole 201c of the rotating shaft 201 in the lawn mowing rotor 200. That is, with respect to the lawn mowing rotor 200 attached to the rotary shaft 101 via the attachment member 12, the fixing pin 17 is passed through in a direction substantially perpendicular to the central axis О direction. Then, by inserting an r-pin 18, which is a fixing member, into the r-pin hole 17a of the fixing pin 17, the movement of the fixing pin 17 is restricted. In this way, the rotary shaft 101 and the rotating shaft 201 are fixed via the attachment member 12.

[0037] In the conventional configuration where a bolt is inserted in the rotating shaft of the work unit in the rotating shaft direction and the bolt is fastened to the end of the rotary shaft to fix the rotary shaft and the work unit, the length of the rotating shaft varies depending on the type of the work unit, and the length of the bolt also varies according to the length of the rotating shaft. Therefore, it is necessary to prepare bolts of different lengths for each work unit, increasing the number of parts during work unit replacement and making the replacement work complicated.

[0038] In contrast, according to the present embodiment, by means of the simple attachment mechanism 1 using the attachment member 12 and the fixing members (fixing pin 17, r-pin 18), the mowing rotor 200 can be easily attached to the rotary shaft 101 of the center drive type rotary working machine 100. That is, after attaching the rotary shaft 201 of the mowing rotor 200 to the rotary shaft 101 via the attachment member 12, the fixing pin 17 is passed through in a direction substantially perpendicular to the direction of the rotary shaft О, and the movement of the fixing pin 17 is restricted by the r-pin 18 to fix the attachment state, and the mowing rotor 200 can be easily attached to the rotary shaft 101 via the attachment member 12.

[0039] In such a simple attachment mechanism 1, when a plurality of types of work units that can be detachably attached to the rotary shaft 101 of the rotary working machine 100 are provided, regardless of which work unit is attached to the rotary shaft 101, the attachment state using the attachment member 12 and the fixing members (fixing pin 17, r-pin 18) as shown in FIG. 3 is common. Therefore, even if the lengths of the rotary shafts of the respective work units that can be detachably attached to the rotary shaft 101 are different from each other, it is not necessary to prepare bolts of different lengths according to the length of the rotary shaft for each work unit. Regardless of the length of the rotary shaft, the work unit can be easily attached and detached to and from the rotary shaft 101 using a small number of common parts such as the attachment member 12 and the fixing members (fixing pin 17 and r-pin 18). Therefore, the work of replacing the work unit in the rotary working machine 100 can be easily performed.

[0040] As described above, in the attachment mechanism 1, the attachment work of the mowing rotor 200 to the rotary shaft 101 can be easily performed using the attachment member 12 and the fixing members such as the fixing pin 17. Furthermore, as described above, when the outer diameter shape of the rotary shaft 101 and the inner diameter shape of the insertion hole 15a of the cylindrical body 15 are the same polygonal shape (hexagonal shape, etc.), and when the outer diameter shape of the cylindrical body 15 and the inner diameter shape of the shaft hole 201a of the rotary shaft 201 are the same polygonal shape (hexagonal shape, etc.), this attachment work can be performed more easily.

[0041] Furthermore, for example, one or more bolt holes (not shown) may be formed on the inner side support member 202 side rather than at the location where the fixing pin 17 penetrates the side portion of the rotating shaft 201 of the mowing rotor 200. In this case, a bolt (not shown) with a washer and a nut set thereon is passed through the bolt hole, and the bolt may be fastened to the outer surface (outer surface of the side portion) of the cylindrical body 15 constituting the attachment member 12 with a wrench or a spanner (not shown). Thereby, the rotating shaft 201 is more firmly fixed to the attachment member 12. As a result, the stability of the mowing rotor 200 mounted on the rotary shaft 101 via the attachment member 12 is improved.

[0042] Also, in the rotary working machine 100 in which the mowing rotor 200 is mounted on the rotary shaft 101 via the attachment member 12 by this attachment mechanism 1, the entire circumference of the base end portion 101a of the rotary shaft 101 is covered by the configuration in which the flange portion 13 is disposed in the recess 11d of the surrounding wall portion 11. Thereby, in the rotary working machine 100, when the rotary shaft 101 and the mowing rotor 200 rotate integrally with the attachment member 12 interposed therebetween during the mowing operation, the base end portion 101a of the rotary shaft 101 is not exposed to the outside. Therefore, the problem of grass or the like getting entangled there is suppressed, and grass, string, dust, or the like does not hit the oil seal 104 at the base end portion 101a, nor does grass, string, or the like wind around the oil seal. Thus, the base end portion 101a of the rotary shaft 101 is appropriately protected. Also, during this rotation, since no friction occurs between the flange portion 13 and the surrounding wall portion 11 due to the gap 11f formed between the flange portion 13 disposed in the recess 11d of the surrounding wall portion 11 and the bottom surface 11e of the recess 11d, smooth rotation is realized.

[0043] After an operator performs a mowing operation using the rotary working machine 100 equipped with the mowing rotor 200, when removing (detaching) this mowing rotor 200 from the rotary working machine 100, after removing the r-pin 18 from the fixing pin 17, the fixing pin 17 is removed from the fixing holes 101b, 15b, and 201c. Then, the rotating shaft 201 of the mowing rotor 200 is removed from the cylindrical body 15 of the attachment member 12. According to the attachment mechanism 1, with such a simple removal operation, the mowing rotor 200 can be easily removed (detached) from the rotary shaft 101 to which the attachment member 12 is attached. And in the attachment mechanism 1, instead of this removed mowing rotor 200, another working unit can be easily attached to the rotary shaft 101 via the attachment member 12 in the same manner as when the above-mentioned mowing rotor 200 is attached.

[0044] In the attachment mechanism 1 of the rotary working machine 100 according to the present embodiment, for example, the above-mentioned tilling rotor 300 (FIG. 4) can be easily attached to the rotary shaft 101 of the rotary working machine 100 as another working unit instead of the mowing rotor 200. In the following description of the tilling rotor 300, the description of the same configuration as the above-mentioned mowing rotor 200 will be omitted as appropriate.

[0045] The tilling rotor 300 shown in FIG. 4 includes a rotating shaft 301 attached to the rotary shaft 101 via an attachment member 12 and a plurality of tilling claws 302. The plurality of tilling claws 302 are each planted on the rotating shaft 301 via a claw holder 303. That is, a plurality of claw holders 303 equal in number to the tilling claws 302 project radially on the rotating shaft 301 at appropriate intervals from each other. Each tilling claw 302 has its base side inserted into the claw holder 303 and is then fixed to the claw holder 303 by a bolt 304 or the like with, for example, a washer and a nut (not shown) set. In this way, the plurality of tilling claws 302 are provided outside the rotating shaft 301. Note that the number of tilling claws 302 on the rotating shaft 301 is not particularly limited and can be any number.

[0046] The rotating shaft 301 has a length different from that of the above-described rotating shaft 201, and otherwise has the same configuration as the rotating shaft 201 (that is, the state in which the rotating shaft 301 is attached to the rotary shaft 101 via the attachment member 12 is the same as that in FIG. 3). Note that the length of the rotating shaft 301 shown in FIG. 4 is longer than that of the rotating shaft 201 as an example, but is not limited thereto, and may be shorter than the rotating shaft 201, for example.

[0047] When assembling the attachment mechanism 1 using the tilling rotor 300 having this rotating shaft 301, that is, when attaching the tilling rotor 300 to the rotary shaft 101 of the rotary working machine 100, it is performed in the same manner as the example of attaching the mowing rotor 200 described above. That is, the rotary shaft 101 of the rotary working machine 100 is inserted into the insertion hole 15a of the cylindrical body 15 constituting the attachment member 12. Then, the cylindrical body 15 in that state is inserted into the shaft hole 301a of the rotating shaft 301 in the tilling rotor 300. Thereby, the tilling rotor 300 is attached to the rotary shaft 101 of the rotary working machine 100 via the attachment member 12. In this attachment, the tilling rotor 300 is moved in the direction of arrow Y shown in FIG. 4 toward the rotary shaft 101, and the tilling rotor 300 is attached to the rotary shaft 101.

[0048] Note that the inner diameter shape (hollow cross-sectional shape) of the shaft hole 301a may be any shape as long as the attachment member 12 and the rotating shaft 301 of the tilling rotor 300 can rotate integrally. As an example, the inner diameter shape (hollow cross-sectional shape) of the shaft hole 301a may be a polygon such as a hexagon (FIG. 4) having the same shape as the outer diameter shape of the cylindrical body 15.

[0049] After attaching the tilling rotor 300 to the rotary shaft 101 of the rotary working machine 100 via the attachment member 12, in the same manner as the attachment example of the above-described mowing rotor 200 (see FIG. 3), the fixing hole 101b of the rotary shaft 101, two fixing holes 15b symmetric with respect to the central axis О formed on the side portion of the cylindrical body 15 constituting the attachment member 12, and two fixing holes 301b symmetric with respect to the central axis О formed on the side portion of the rotary shaft 301 of the tilling rotor 300 are penetrated by the fixing pin 17 (in a direction substantially perpendicular to the central axis О direction). Thereafter, the above-described r-pin 18 is inserted into the r-pin hole 17a of the fixing pin 17 to restrict the movement of the fixing pin 17, thereby fixing the rotary shaft 101, the attachment member 12, and the rotary shaft 301. According to the attachment mechanism 1, the tilling rotor 300 can be easily attached to the rotary shaft 101 by such a simple attachment and fixing operation.

[0050] When performing tilling work using the rotary working machine 100 equipped with the tilling rotor 300, in the same manner as when performing mowing work using the rotary working machine 100 equipped with the above-described mowing rotor 200, the power of the engine (not shown) in the riding tractor or the walking tractor is transmitted to the rotary shaft 101 via the gears, chains, etc. in the transmission case 102, and this rotary shaft 101 is rotated. As the rotary shaft 101 rotates, the tilling rotor 300 attached to the rotary shaft 101 via the attachment member 12 rotates (that is, the plurality of tilling claws 302 rotate), whereby the soil is tilled. The operator operates the riding tractor or the walking tractor to perform field work with this rotary working machine 100, and performs tilling work by applying the tilling claws 302 of the tilling rotor 300 to the soil.

[0051] After an operator performs tilling work using the rotary working machine 100 equipped with the tilling rotor 300, when removing (detaching) this tilling rotor 300 from the rotary working machine 100, similar to the example of the mowing rotor 200 described above, after removing the r-pin 18 from the fixed pin 17, the fixed pin 17 is removed from the fixing holes 101b, 15b, and 301b. Then, the rotary shaft 301 of the tilling rotor 300 is removed from the cylindrical body 15 of the attachment member 12. According to the attachment mechanism 1, with such a simple removal operation, the tilling rotor 300 can be easily removed (detached) from the rotary shaft 101 to which the attachment member 12 is attached.

[0052] Also, in the attachment mechanism 1 of the rotary working machine 100 according to the present embodiment, for example, the above-mentioned ridging rotor 400 (FIG. 5) can be attached as another working unit to the rotary shaft 101 of the rotary working machine 100 instead of the mowing rotor 200 or the tilling rotor 300. In the following description of the ridging rotor 400, the description of the same configuration as the above-mentioned mowing rotor 200 and tilling rotor 300 will be omitted as appropriate.

[0053] The ridging rotor 400 shown in FIG. 5 includes a rotary shaft 401 attached to the rotary shaft 101 via an attachment member 12 and a plurality of soil-lifting claws 402. The plurality of soil-lifting claws 402 are each planted on the rotary shaft 401 via a claw holder 403. That is, a plurality of claw holders 403 equal in number to the soil-lifting claws 402 project radially on the rotary shaft 401 at appropriate intervals from each other. Each soil-lifting claw 402 has its base side inserted into the claw holder 403 so that the tip side thereof inclines toward one end side of the rotary shaft 401 rather than the base side, and is then fixed to the claw holder 403 by a bolt 404 or the like with, for example, a washer and a nut (not shown) set. In this way, the plurality of soil-lifting claws 402 are provided outside the rotary shaft 401. Note that the number of soil-lifting claws 402 on the rotary shaft 401 is not particularly limited and can be any number.

[0054] The rotating shaft 401 has a length different from that of the above-described rotating shafts 201 and 301, and otherwise has the same configuration as the rotating shafts 201 and 301 (that is, the state where the rotating shaft 401 is attached to the rotary shaft 101 via the attachment member 12 is the same as that in FIG. 3). Note that the length of the rotating shaft 401 shown in FIG. 5 is shorter than that of either of the rotating shafts 201 and 301 as an example, but is not limited thereto. For example, it may be longer than the rotating shaft 201 and shorter than the rotating shaft 301.

[0055] When assembling the attachment mechanism 1 using the ridging rotor 400 having this rotating shaft 401, that is, when attaching the ridging rotor 400 to the rotary shaft 101 of the rotary working machine 100, it is performed in the same manner as the above-described examples of attaching the mowing rotor 200 and the tilling rotor 300. That is, after inserting the rotary shaft 101 into the insertion hole 15a of the cylindrical body 15, the cylindrical body 15 in that state is inserted into the shaft hole 401a of the rotating shaft 401 in the ridging rotor 400, whereby the ridging rotor 400 is attached to the rotary shaft 101 via the attachment member 12. In this attachment, the ridging rotor 400 is moved in the direction of arrow Y shown in FIG. 5 toward the rotary shaft 101, and the ridging rotor 400 is attached to the rotary shaft 101.

[0056] Thereafter, in the same manner as the above-described examples of attaching the mowing rotor 200 or the tilling rotor 300, the fixing pin 17 is passed through (in a direction substantially perpendicular to the direction of the central axis О) the fixing hole 101b, the two fixing holes 15b formed symmetrically with respect to the central axis О formed on the side portion of the cylindrical body 15, and the two fixing holes 401b formed symmetrically with respect to the central axis О formed on the side portion of the rotating shaft 401. Then, the above-described r-pin 18 is inserted into the r-pin hole 17a of the fixing pin 17 to restrict the movement of the fixing pin 17, thereby fixing the rotary shaft 101, the attachment member 12, and the rotating shaft 401.

[0057] When performing ridging (furrowing) work using the rotary working machine 100 with the ridging rotor 400 attached to the rotary shaft 101 via the attachment member 12, the rotary shaft 401 is rotated by the rotation of the rotary shaft 101 based on the power of the engine (not shown), in the same manner as when performing the above-described mowing work or tilling work. When the plurality of soil-lifting claws 402 provided on this rotary shaft 401 rotate, ridging of the field is performed. The operator operates a riding tractor or a walking tractor to perform field work with this rotary working machine 100, and performs ridging work by applying the soil-lifting claws 402 of the ridging rotor 400 to the soil in the field.

[0058] After the operator performs ridging (furrowing) work using the rotary working machine 100 with the ridging rotor 400 attached, when removing (detaching) this ridging rotor 400 from the rotary working machine 100, similar to the examples of the mowing rotor 200 and the tilling rotor 300 described above, after removing the r-pin 18 from the fixing pin 17, the fixing pin 17 is removed from the fixing holes 101b, 15b, 401b. Then, the rotary shaft 401 of the ridging rotor 400 is removed from the cylindrical body 15 of the attachment member 12. According to the attachment mechanism 1, with such a simple removal operation, the ridging rotor 400 can be easily removed (detached) from the rotary shaft 101 to which the attachment member 12 is attached.

[0059] As described above, according to the attachment mechanism 1 of the rotary working machine 100 according to the present embodiment, when providing a plurality of types of work units that can be detachably attached to the rotary shaft 101 of the center drive type rotary working machine 100, such as the above-described mowing rotor 200, tilling rotor 300, and ridging rotor 400, various work units can be easily and detachably attached.

[0060] FIG. 6 shows an example in which, as a conventional working unit, a mowing rotor 600 (FIG. 6(a)), a tilling rotor 700 (FIG. 6(b)), and a ridging rotor 800 (FIG. 6(c)) are respectively mounted on a rotary shaft 101 of a rotary working machine 100. The inner support member 602, the outer support member 603, and the spiral blade 604 included in the conventional mowing rotor 600 shown in FIG. 6(a) have the same configuration as the inner support member 202, the outer support member 203, and the spiral blade 204 of the mowing rotor 200 described above. The rotary shaft 601 of the mowing rotor 600 is such that a bolt 501 can be inserted into its shaft hole (not shown). Unlike the rotary shaft 201 of the mowing rotor 200, a bolt hole 601b having an inner diameter slightly larger than the outer diameter (bolt diameter) of the bolt 501 is formed while one end portion 601a thereof is closed. The length of the bolt 501 is set according to the length of the rotary shaft 601 in consideration of the mounting state of the rotary shaft 601 with respect to the rotary shaft 101. In the examples of FIGS. 6(a) to 6(c), the base end portion of the rotary shaft 101 included in the rotary working machine 100 is covered around by a shaft fixing portion 105 or the like.

[0061] When mounting the mowing rotor 600 on the rotary shaft 101, after attaching the rotary shaft 601 of the mowing rotor 600 to the rotary shaft 101, the bolt 501 is passed through the bolt hole 601b, and the bolt 501 is fastened with a wrench, a spanner, or the like (not shown) with respect to the bolt fixing hole 101d of the rotary shaft 101, thereby fixing the rotary shaft 101 and the mowing rotor 600. Conventionally, the mowing rotor 600 was directly mounted on the rotary shaft 101 in this manner.

[0062] The tilling claws 702, claw holders 703, and bolts 704 of the conventional tilling rotor 700 shown in FIG. 6(b) have the same configurations as the tilling claws 302, claw holders 303, and bolts 304 of the tilling rotor 300 described above. The rotating shaft 701 of the tilling rotor 700 has a bolt hole 701b with an inner diameter slightly larger than the outer diameter (bolt diameter) of the bolt 502 while one of its end portions 701a is closed, and a bolt 502 can be inserted into its shaft hole (not shown). The length of the bolt 502 is set according to the length of the rotating shaft 701 in consideration of the mounting state of the rotating shaft 701 with respect to the rotary shaft 101.

[0063] When mounting the tilling rotor 700 onto the rotary shaft 101, after attaching the rotating shaft 701 of the tilling rotor 700 to the rotary shaft 101, the bolt 502 is passed through the bolt hole 701b, and the bolt 502 is fastened with a wrench, a spanner, or the like (not shown) to the bolt fixing hole 101d of the rotary shaft 101, thereby fixing the rotary shaft 101 and the tilling rotor 700. Conventionally, the tilling rotor 700 was directly mounted onto the rotary shaft 101 in this manner.

[0064] The soil-lifting claws 802, claw holders 803, and bolts 804 of the conventional ridging rotor 800 shown in FIG. 6(c) have the same configurations as the soil-lifting claws 402, claw holders 403, and bolts 404 of the ridging rotor 400 described above. The rotating shaft 801 of the ridging rotor 800 has a bolt hole 801b with an inner diameter slightly larger than the outer diameter (bolt diameter) of the bolt 503 while one of its end portions 801a is closed, and a bolt 503 can be inserted into its shaft hole (not shown). The length of the bolt 503 is set according to the length of the rotating shaft 801 in consideration of the mounting state of the rotating shaft 801 with respect to the rotary shaft 101.

[0065] When attaching the ridging rotor 800 to the rotary shaft 101, after attaching the rotary shaft 801 of the ridging rotor 800 to the rotary shaft 101, pass the bolt 503 through the bolt hole 801b, and use a wrench, a spanner, or the like (not shown) to fasten the bolt 503 to the bolt fixing hole 101d of the rotary shaft 101, thereby fixing the rotary shaft 101 and the ridging rotor 800. Conventionally, the ridging rotor 800 was directly attached to the rotary shaft 101 in this way.

[0066] In the examples of FIGS. 6(a) to 6(c), the lengths of the rotary shafts of the respective work units become longer as the rotary shaft 801 of the ridging rotor 800, the rotary shaft 601 of the mowing rotor 600, and the rotary shaft 701 of the tilling rotor 700. Accordingly, the lengths of the bolts also become longer as the bolt 503, the bolt 501, and the bolt 502. Conventionally, when attaching various work units to the rotary shaft 101, it was necessary to prepare bolts of different lengths for each work unit according to the different lengths of the rotary shafts of the various work units.

[0067] On the other hand, according to the attachment mechanism 1 of the rotary working machine 100 according to the present embodiment, even if the lengths of the rotary shafts of the work units that can be detachably attached to the rotary shaft 101 are different from each other, it is not necessary to prepare bolts of different lengths for each work unit. Regardless of the length of the rotary shaft, using a small number of common parts such as the attachment member 12 and the fixing member (the fixing pin 17 and the r-pin 18), each work unit can be easily detachably attached to the rotary shaft 101. That is, according to the attachment mechanism 1, with a simple configuration and easy replacement work, in the rotary working machine 100, different types of work units such as the mowing rotor 200, the tilling rotor 300, and the ridging rotor 400 can be exchanged.

[0068] With such an attachment mechanism 1, for example, in tilling operations performed using a ride-on tractor (not shown) with a rotary working machine 100 equipped with a tilling rotor 300 directly mounted at the rear, while advancing the ride-on tractor by an operation using the operator's steering wheel or the like, as the rotary shaft 101 rotates based on the power of an engine (not shown), the tilling rotor 300 mounted on the rotary shaft 101 via the attachment member 12 rotates (a plurality of tilling claws 302 rotate), and the soil is tilled by the plurality of tilling claws 302 turning the soil over and the like.

[0069] According to the present embodiment, after performing tilling operations using such a ride-on tractor, by means of the above-described simple removal and attachment operations, for example, the tilling rotor 300 and the mowing rotor 200 can be easily exchanged, and the ride-on tractor can be used for mowing operations. In this case, as described above, after removing the fixed pin 17 from which the r-pin 18 has been removed from the fixing holes 101b, 15b, 201c, the rotary shaft 301 of the tilling rotor 300 is removed from the cylindrical body 15 of the attachment member 12. Thereafter, instead of the removed tilling rotor 300, the mowing rotor 200 is attached to the rotary shaft 101 via the attachment member 12 and fixed with the fixed pin 17 and the r-pin 18. According to the present embodiment, with such a simple attachment mechanism 1, for example, a rotary working machine 100 directly mounted on a ride-on tractor (not shown) driven by low horsepower (e.g., 20 horsepower or less) can be easily used as another working machine such as a management machine.

[0070] Also, with this attachment mechanism 1, in the rotary working machine 100 equipped with any of the working units attachable to the rotary shaft 101, such as the mowing rotor 200, the tilling rotor 300, and the ridging rotor 400, the flange portion 13 of the attachment member 12 is disposed within the recess 11d of the enclosure portion 11, so that the entire circumference of the base end portion 101a of the rotary shaft 101 is covered. As a result, in this rotary working machine 100, in any case of performing operations such as mowing work, tilling work, and ridging (ditching) work, when the rotary shaft 101 and the working unit rotate integrally together with the attachment member 12 interposed therebetween, the base end portion 101a of the rotary shaft 101 is prevented from being exposed to the outside. Therefore, during this rotation, it is possible to suppress the problem that grass or the like gets entangled with the base end portion 101a of the rotary shaft 101, and also prevent objects such as grass, strings, and dust from hitting the oil seal 104 at the base end portion 101a of the rotary shaft 101 or winding around the oil seal, so that the base end portion 101a of the rotary shaft 101 can be appropriately protected. That is, the operations performed by attaching various units to the rotary shaft 101 can be carried out smoothly and with high durability. Also, during this rotation, since no friction occurs between the flange portion 13 and the enclosure portion 11 due to the gap 11f formed between the bottom surface 11e of the recess 11d of the enclosure portion 11 and the flange portion 13, smooth rotation is realized.

Explanation of Reference Numerals

[0071] 1: Attachment mechanism, 11: Enclosure part, 11a: Central hole, 11b: Base part, 11c: Concave part forming part, 11d: Concave part, 11e: Bottom surface, 11f: Gap, 12: Attachment member, 13: Flange part, 13a: Disk surface, 14: Tip cover part, 14a: Bolt hole, 14b: Inner surface, 15: Cylindrical body, 15a: Insertion hole, 15b: Fixing hole, 16: Bolt, 17: Fixing pin, 17a: Hole for r-pin, 18: r-pin, 100: Center drive type rotary working machine (rotary working machine), 101: Rotary shaft, 101a: Base end part, 101b: Fixing hole, 101c: Tip, 101d: Bolt fixing hole, 102: Transmission case, 103: Mounting part, 104: Oil seal, 200: Grass cutting rotor, 201: Rotation shaft, 201a: Shaft hole, 201b: Tip, 201c: Fixing hole, 202: Inner support member, 203: Outer support member, 204: Spiral blade, 300: Cultivation rotor, 301: Rotation shaft, 301a: Shaft hole, 302: Cultivation claw, 303: Claw holder, 304: Bolt, 400: Ridging rotor, 401: Rotation shaft, 401a: Shaft hole, 402: Earth raising claw, 403: Claw holder, 404: Bolt, 105: Shaft fixing part, 501 - 503: Bolts, 600: Grass cutting rotor, 601: Rotation shaft, 601a: End part, 601b: Bolt hole, 602: Inner support member, 603: Outer support member, 604: Spiral blade, 700: Cultivation rotor, 701: Rotation shaft, 701a: End part, 701b: Bolt hole, 702: Cultivation claw, 703: Claw holder, 704: Bolt, 800: Ridging rotor, 801: Rotation shaft, 801a: End part, 801b: Bolt hole, 802: Earth raising claw, 803: Claw holder, 804: Bolt

Claims

1. An attachment mechanism for detachably attaching different working units to a rotary shaft of a center drive type rotary working machine, a surrounding wall portion surrounding the entire circumference of the base end portion of the rotary shaft, and an attachment member interposed between the rotary shaft and the rotation shaft of the working unit and rotating integrally with the rotary shaft and the rotation shaft, wherein the attachment member has a flange portion disposed in a recess of the surrounding wall portion on one end side, a tip cover portion covering the tip of the rotary shaft on the other end side, and is a cylindrical body having an insertion hole into which the rotary shaft is inserted, and a fixing hole through which a fixing member for fixing the rotary shaft and the working unit via the cylindrical body can penetrate is formed in a side portion of the cylindrical body, characterized in that it is an attachment mechanism for a rotary working machine.

2. The length of the cylindrical body is set such that a gap is formed between the flange portion and the bottom surface of the recess in a state where the inner surface of the tip cover portion is in contact with the tip of the rotary shaft, according to the attachment mechanism for a rotary working machine according to Claim 1.

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