Work vehicle attachment

Abstract

To provide a work vehicle attachment capable of cleanly cutting an object to be cut with reduced tearing thereof.SOLUTION: A work vehicle attachment comprises: a grapple member 10 that holds an object to be cut; and cutting means 11 that cuts the object to be cut. Therein the cutting means 11 includes: a blade member 40; and drive means 41 that drives the blade member 40. The blade member 40 has circular main bodies 50, has a saw blade-shaped cutting edge 51 around a periphery of each of the main bodies 50, and has an engaging portion 53 on a side surface of each of the main bodies. The drive means 41 has a driving body 62 that rotates by power, the blade member 40 is rotatably supported, and the driving body 62 engages with the engaging portion 53 to rotate the blade member 40.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a work vehicle attachment that is attached to a vehicle having a working arm to form a work vehicle such as a lumbering machine, civil engineering machine, construction machine, forestry machine, etc. The present invention also relates to a work vehicle equipped with a tree cutting function. [Background technology]

[0002] Patent Document 1 discloses an attachment that can be attached to the arm of a vehicle. The attachment 100 disclosed in Patent Document 1 has a bucket 102, a grapple member 105, and further has a cutting device 101, as shown in FIG. The grapple member 105 is swung by a cylinder in a direction toward or away from the opening of the bucket 102 .

[0003] The cutting device 101 is composed of a cutting blade 106 and a receiving frame 107 that houses the cutting blade 106. The cutting blade 106 is also swung by a cylinder, and the free end side swung from a position away from the opening of the bucket 102 in a direction toward entering the receiving frame 107. In the attachment 100 disclosed in Patent Document 1, a tree is clamped between the grapple member 105 and the edge of the opening of the bucket 102. Then, the cutting blade 106 is swung from a position away from the opening of the bucket 102 in a direction toward the receiving frame 107, and the tree is cut. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-163889 Summary of the Invention [Problem to be solved by the invention]

[0005] The cutting blade 106 disclosed in Patent Document 1 functions similarly to a hatchet or an axe, and applies a shearing force to wood to cut it down. As a result, wood cut with the attachment 100 has crushed cut surfaces, making it difficult to use as building materials. In other words, wood cut with the attachment 100 has crushed cut surfaces and ripped sections. Furthermore, the ripped sections affect the inside of the cut surfaces, causing damage near the cut surfaces. Therefore, wood cut with the attachment 100 of the prior art has the problem of limited uses. SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems of the prior art, and has as its object to provide an attachment for a work vehicle that can cut cleanly with less tearing of the object to be cut. [Means for solving the problem]

[0006] An embodiment for solving the above-mentioned problems is an attachment for a work vehicle which is attached to a vehicle and has a grapple member for holding objects, and cutting means for cutting objects, wherein the cutting means has a blade member and a drive means for driving the blade member, the blade member has a circular main body portion with a saw-tooth cutting edge around the periphery of the main body portion and an engagement portion on the side of the main body portion, the drive means has a drive body that rotates by power, the blade member is rotatably supported, and the drive body engages with the engagement portion to rotate the blade member.

[0007] Although not limited to this, the work vehicle attachment of this aspect is primarily intended to cut wood. The work vehicle attachment of this aspect is capable of, for example, cutting trees and transporting the trees. The blade member employed in the work vehicle attachment of this aspect has a circular main body with a saw-like cutting edge around the periphery of the main body. Because the blade member employed in the work vehicle attachment of this aspect is circular saw-shaped, it is less likely to tear at the cut surface, resulting in a clean cut surface. In addition, in the work vehicle attachment of this aspect, the blade member has an engaging portion on the side thereof, and the driver engages with this engaging portion to rotate the blade member, allowing the blade member to cut deeply into wood. That is, a typical circular saw has a motor attached to the center that rotates the saw blade. Therefore, the cutting depth into the workpiece is physically limited by the motor, and can only be cut to a depth where the motor housing touches the wood. In contrast, with the work vehicle attachment of this aspect, the driver can be engaged with the blade member at a position off-center to rotate the blade member, making it possible to make deep cuts into the object to be cut.

[0008] In the above-described aspect, it is desirable that the engagement portion is a row of holes arranged in a circle, the driving body is a gear, and the gear engages with the holes to rotate the main body.

[0009] Here, the "gear" is not limited to an involute gear, and any known tooth profile may be used. For example, it may be a pin gear. The attachment for a work vehicle of this aspect can form the engaging portion with a simple structure and is easy to manufacture.

[0010] In each of the above-described aspects, it is desirable that the blade member has a plurality of rows of saw-like cutting edges.

[0011] In each of the above-mentioned aspects, it is desirable that the blade member has two plates, each of which has a saw-tooth cutting edge around its periphery, and that the cutting edges on the two plates are inclined or curved outward.

[0012] In each of the above aspects, it is desirable that the blade member has a holding portion that rotatably supports the blade member, and that the width of the support portion of the holding portion is narrower than the maximum width of the area of ​​the main body where the cutting edge is provided.

[0013] According to this aspect, it is possible to make deep cuts into the object to be cut.

[0014] An aspect relating to a work vehicle is characterized by having a self-propelled vehicle section and any of the attachments for a work vehicle described above.

[0015] An aspect of the cutting device is a cutting device having a blade member and a driving means for driving the blade member, wherein the blade member has a circular main body portion and has a saw-tooth cutting edge around the periphery of the main body portion, an engaging portion is provided on the side of the main body portion, the driving means has a driving body that rotates by power, the blade member is rotatably supported, the driving body engages with the engaging portion to rotate the main body portion, and the cutting device has a holding portion that rotatably supports the blade member, and the width of the supporting portion of the holding portion is narrower than the maximum width of the area where the cutting edge of the blade member is provided.

[0016] The cutting device of this aspect can make deep cuts into the object to be cut. [Effects of the Invention]

[0017] The work vehicle attachment and cutting device of the present invention can cut the object cleanly with less tearing. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a front view of a forestry machine (work vehicle) equipped with an attachment for a work vehicle according to an embodiment of the present invention. [Figure 2] 1 is a perspective view of an attachment for a work vehicle according to an embodiment of the present invention. [Figure 3] FIG. 3 is an exploded perspective view of the attachment for the work vehicle shown in FIG. 2. [Figure 4] FIG. 3 is a perspective view of a cutting device for the attachment for the work vehicle shown in FIG. 2. [Figure 5] 3 is an exploded perspective view of the cutting device of the attachment for the work vehicle shown in FIG. 2. FIG. [Figure 6]3 is a cross-sectional view of the cutting device for the attachment for the work vehicle shown in FIG. 2. FIG. [Figure 7] FIG. 7 is an enlarged view of part A in FIG. 6. [Figure 8] FIG. 7 is an enlarged view of parts B and C in FIG. 6. [Figure 9] 5(a) and 5(b) are explanatory views showing the operation of a cutting device for an attachment for a work vehicle. [Figure 10] 10(c) to 10(f) are explanatory views showing the operation of the cutting device for the attachment for a work vehicle, following FIG. 9. [Figure 11] FIG. 1 is a front view of a conventional work vehicle attachment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described. The work vehicle 90 shown in FIG. 1 is a forestry machine that transports trees cut down from a forest or woods and cuts them to desired dimensions. The work vehicle 90 comprises a vehicle 2 to which an attachment 1 for a work vehicle is attached. That is, the work vehicle attachment 1 of this embodiment is an attachment that is attached to a self-propelled vehicle 2, as shown in FIG. 1 is the main body of a self-propelled work vehicle such as a known power shovel, and has a boom 5 attached to a traveling vehicle 3, and is further provided with an arm 6. As is known, the boom 5 and arm 6 are swung by cylinders 7 and 8.

[0020] The work vehicle attachment 1 is attached to the tip of an arm 6 as shown in FIG. The work vehicle attachment 1 has a grapple device (grapple member) 10 and a cutting device (cutting means) 11. The grapple device 10 has grapple arms 12 and 13 that swing as shown in FIG. One of the mounting plates 15 has a grapple mounting portion 17 and a cutting device mounting portion 18. The grapple mounting portion 17 is a substantially triangular plate and is provided with pin insertion holes 32a and 32b. The cutting device mounting portion 18 is provided with a cutting device mounting hole 33. The other mounting plate 16 has only a grapple mounting portion 17 .

[0021] Each of the grapple arms 12, 13 has two arm pieces 20, 21, which are connected by connecting pieces 22, 23. The grapple arms 12 and 13 have gears (not shown) formed on their base ends.

[0022] The grapple arms 12, 13 are swingably connected to the mounting plates 15, 16 via shafts 25a, 25b. That is, the shafts 25a, 25b are inserted into pin insertion holes 32a, 32b formed in the grapple mounting portions 17 of the mounting plates 15, 16, and the grapple arms 12, 13 are swingably connected to the mounting plates 15, 16 via the shafts 25a, 25b. In addition, a gear (not shown) of one grapple arm 12 and a gear (not shown) of the other grapple arm 13 are engaged with each other, so that the two grapple arms 12 and 13 move in conjunction with each other. The mounting plates 15 and 16 are attached to the tip of the arm 6 of the traveling vehicle 3, and the grapple arms 12 and 13 are attached to the tip of the arm 6 of the traveling vehicle 3 via the mounting plates 15 and 16.

[0023] The grapple arms 12, 13 are connected to a cylinder 31 via a link mechanism 30 as shown in Fig. 1. The grapple arms 12, 13 swing by extending or retracting the cylinder 31, and the grapple arms 12, 13 are opened or closed. That is, when the rod of the cylinder 31 is extended or retracted, one grapple arm 12 swings around the axis 25a. In addition, the other grapple arm 13 also swings because a gear (not shown) at the base end of the other grapple arm 13 is engaged with a gear (not shown) of the grapple arm 12. Therefore, when the rod of the cylinder 31 is extended or retracted, the two grapple arms 12, 13 operate in conjunction with each other, moving closer to or farther away from each other. That is, when the rod of the cylinder 31 is extended or retracted, the two grapple arms 12, 13 open and close, performing a gripping operation and a releasing operation. Specifically, when the rod of the cylinder 31 is extended, the two grapple arms 12, 13 close to grip and hold wood or the like. When the rod of the cylinder 31 is retracted, the two grapple arms 12, 13 open and release the wood or the like that they had been gripping.

[0024] The cutting device (cutting means) 11 has a blade member 40, a driving means 41 that drives the blade member 40, and a back pressure bearing member 42. In this embodiment, the cutting device (cutting means) 11 also has a support member 45 that supports the blade member 40, the driving means 41, and the back pressure bearing member 42.

[0025] The blade member 40 is a two-blade circular saw. That is, the blade member 40 is composed of two circular saw members 46 and 47. Since the circular saw members 46 and 47 have the same shape, only one of them, the circular saw member 46, will be described. The circular saw member 46 has a circular main body 50, and a saw-tooth cutting edge 51 is formed around the periphery of the main body 50. A cutting tip (not shown) is attached to the cutting edge 51. The cutting edge 51 is inclined to one side as shown in Figures 4 to 6.

[0026] The circular saw member 46 employed in this embodiment has an engagement portion 53 provided on the side of a main body 50. The engagement portion 53 is a row of a plurality of holes 55 arranged in a circle. The holes 55 penetrate the main body 50. The hole 55 is provided in the region between the center of the main body 50 and the cutting edge 51. The position of the hole 55 is closer to the cutting edge 51 than the center of the main body 50. In this embodiment, the hole 55 is formed at a position close to the cutting edge 51. The holes 55 are shaped like elongated holes and are arranged in an arc shape at equal intervals.

[0027] The blade member 40 is formed by joining the two circular saw members 46 and 47 back to back. In other words, when the two circular saw members 46 and 47 are joined together, the cutting edges 51a and 51b are inclined outward as shown in Figures 4 to 6, and are set apart. That is, the blades of one circular saw member 46 and the blades of the other circular saw member 47 are arranged between each other, and the cutting edges 51a of one circular saw member 46 and the cutting edges 51b of the other circular saw member 47 are inclined in directions away from each other.

[0028] The driving means 41 is made up of a hydraulic motor 60, a gearbox 61, and a driving gear (driving body) 62. The gearbox 61 is a rectangular box and has the driving gear 62 built in. As shown in FIG. 6, an opening 56 is provided on the side of the gearbox 61 facing the blade member 40. The driving gear 62 is rotatably supported by a bearing (not shown). A part of the driving gear 62 is exposed from the opening 56. The hydraulic motor 60 is attached to one end of a gearbox 61. The drive gear 62 is connected to the hydraulic motor 60 via an intermediate shaft 63. Therefore, when the hydraulic motor 60 is driven, the drive gear 62 rotates.

[0029] The back pressure bearing member 42 is composed of a support box 65, a shaft member 66, and rotors 67a, 67b, and 67c. The shaft member 66 is provided inside the support box 65. The rotors 67a, 67b, and 67c are inserted into the shaft member 66. The rotors 67a, 67b, and 67c are bearings, and their outer rings rotate freely. An opening 68 is provided on the side of the support box 65 facing the blade member 40, as shown in Figure 6. Parts of the rotors 67a, 67b, and 67c are exposed through the opening 68.

[0030] The support member 45 has a front plate 73 and a back plate 75 that face each other with a gap therebetween. The support member 45 is divided into an arm portion 71 and a holding portion 72. The swinging side member 70 of the swinging device 76 is attached to one end of the arm portion 71 of the support member 45. The holding portion 72 is provided at the other end of the arm portion 71. The holder 72 is a portion that supports the blade member 40, the driving means 41, and the back pressure bearing member 42. As described above, the support member 45 is made up of the front plate 73 and the back plate 75 that face each other with a gap between them. In this embodiment, the gap between the front plate 73 and the back plate 75 in the holder 72 forms an accommodation space 83 that accommodates a part of the blade member 40.

[0031] The holding portion 72 has a generally fan-shaped front shape. The holding portion 72 is divided into a support region 77 and a cutting blade housing region 78 that houses a portion of the blade member 40. The support region 77 is a region that includes a portion corresponding to the main side of the fan. The cutting blade housing region 78 is a region that corresponds to the outer periphery side of the fan.

[0032] The width of the accommodation space 83 varies, and the width of the support region 77 is narrower than the width of the cutting edge accommodation region 78. That is, in the support region 77, the gap between the front plate 73 and the back plate 75 is narrow, while in the cutting edge accommodation region 78, the gap between the front plate 73 and the back plate 75 is wide. In this embodiment, the blade member 40 is supported so as to be freely rotatable between the front plate 73 and the back plate 75 of the holder 72. As described above, the holder 72 is divided into the support region 77 and the cutting blade accommodation region 78, and the blade member 40 is supported so as to be freely rotatable in a portion of the support region 77 that corresponds to the hub of the fan. In other words, the blade member 40 is pivotally supported in the support region 77, where the gap between the front plate 73 and the back plate 75 is narrow. In other words, in this embodiment, the portion of the support region 77 that corresponds to the hub of the fan is the pivot portion 85.

[0033] The cutting edge region of the blade member 40 is located in a cutting edge housing region 78 where there is a wide gap between the front plate 73 and the back plate 75. In the blade member 40 employed in this embodiment, the cutting edges 51 a, 51 b are separated, and the cutting edge region of the blade member 40 has a wider overall width than the central region of the blade member 40, but the cutting edge housing region 78 of the holder 72 is wider than the support region 77 of the holder 72, so the sides of the cutting edges 51 a, 51 b do not come into contact with the holder 72. In this embodiment, the overall width Wa of the support region 77 when the blade member 40 is attached is narrower than the overall width Wb of the cutting edges 51 a, 51 b. In this embodiment, the width Wa of at least the support portion 85 of the blade member 40 is narrower than the overall width Wb of the cutting edges 51 a, 51 b.

[0034] In this embodiment, the overall width Wa of the support region 77 is narrower than the overall width Wb of the cutting edges 51a, 51b by 5 mm or more. More preferably, the overall width Wa of the support region 77 is narrower than the overall width Wb of the cutting edges 51a, 51b by 10 mm or more. If the overall width Wb of the cutting edges 51a, 51b is excessively large, the resistance during cutting increases, so it is desirable that the difference between the overall width Wa of the support region 77 and the overall width Wb of the cutting edges 51a, 51b be less than 20 mm. In this embodiment, the width of the support region 77 is the same everywhere, so the overall width Wa of the support portion 85 of the support region 77 is 5 mm or more narrower than the overall width Wb of the cutting edges 51 a, 51 b. More preferably, the overall width Wa of the support portion 85 is 10 mm or more narrower than the overall width Wb of the cutting edges 51 a, 51 b. If the overall width Wb of the cutting edges 51 a, 51 b is excessively large, the resistance during cutting increases, so it is desirable that the difference between the overall width Wa of the support portion 85 and the overall width Wb of the cutting edges 51 a, 51 b be less than 20 mm.

[0035] In this embodiment, the gear box 61 of the driving means 41 is attached to the holding portion 72 of the front plate 73. A part of the driving gear (driving body) 62 of the driving means 41 is located within the accommodation space 83 of the holding portion 72 and engages with the engaging portion 53 of the blade member 40. Therefore, when the hydraulic motor 60 of the driving means 41 is rotated, the driving gear 62 attached to the hydraulic motor 60 rotates, and the blade member 40 engaged with the driving gear 62 rotates.

[0036] In this embodiment, the support box 65 of the back pressure bearing member 42 is attached to the holding portion 72 of the back plate 75. Parts of the rotating bodies 67a, 67b, 67c of the back pressure bearing member 42 are located within the accommodation space 83 of the holding portion 72 and are in contact with the side surfaces of the blade member 40.

[0037] As described above, the mounting plates 15 and 16 are attached to the tip of the arm 6 of the traveling vehicle 3, and one of the mounting plates 15 is provided with a cutting device mounting portion 18. In this embodiment, a support member 45 of the cutting device (cutting means) 11 is attached to the cutting device attachment portion 18 of the attachment plate 15 so as to be able to swing. In this embodiment, a swinging device 76 is attached between the cutting device attachment portion 18 of the support member 45 and the support member 45 . The swinging device 76 has a hydraulic motor 81, a fixed-side member 82, and a swinging-side member 70. When the hydraulic motor 81 is driven, the swinging-side member 70 of the swinging device 76 rotates. In this embodiment, the fixed side member 82 of the swinging device 76 is fixed to the cutting device mounting hole 33 of the cutting device mounting portion 18 , and the swinging side member 70 of the swinging device 76 is fixed to the support member 45 . The support member 45 swings around the swinging member 70 of the swinging device 76 by driving the swinging device 76 .

[0038] In this embodiment, the swinging device 76 is installed in a direction that horizontally crosses the arm 6 of the traveling vehicle 3. Therefore, the blade member 40 swings in a direction that vertically crosses the arm 6 of the traveling vehicle 3, centered on the cutting device mounting portion 18. In addition, the swing axes (shafts 25a, 25b) of the grapple arms 12, 13 are also installed in a direction that horizontally crosses the arm 6 of the traveling vehicle 3, and the swing axes (shafts 25a, 25b) of the grapple arms 12, 13 and the pivot support portion 85 of the blade member 40 are parallel to each other. Therefore, the blade member 40 swings in a direction crossing the grapple arms 12 and 13. The blade member 40 is located near the grapple arms 12, 13 and crosses the sides of the grapple arms 12, 13 in the vertical direction.

[0039] Next, the functions of the work vehicle 90 of this embodiment will be described. The work vehicle 90 has a work vehicle attachment 1 attached to the arm 6 of a vehicle 2. The work vehicle attachment 1 has a device (grapple member) 10 for holding trees, and a cutting device (cutting means) 11 for cutting trees. When cutting a tree 91 using a work vehicle 90, as shown in Figure 9(a), the grapple arms 12, 13 of the grapple device 10, which is a grapple member, are opened and the tree 91 is placed between the grapple arms 12, 13. At this time, the cutting device 11 is raised as shown in Figure 9(a). Then, as shown in FIG. 9( b ), the grapple arms 12 and 13 are closed to hold the tree 91 between them.

[0040] In this state, the hydraulic motor 60 of the driving means 41 is driven to rotate the blade member 40. Then, the hydraulic motor 81 is rotated to drive the swinging device 76, swinging the support member 45, and swinging the blade member 40 supported by the support member 45 until it is pressed against the tree 91 as shown in Figure 10(c). The blade member 40 is made up of two circular saw members 46 and 47, and so cuts through the tree 91 as shown in FIGS. 10(d) and 10(e).

[0041] The blade member 40 employed in this embodiment has cutting edges 51a, 51b that are graded, and the overall width Wb of the cutting edge region of the blade member 40 is wider than the overall width of the central region of the blade member 40. In this embodiment, the overall width Wa of the support region 77 when the blade member 40 is attached is narrower than the overall width Wb of the cutting edges 51a, 51b. In the blade member 40, the width of the kerf formed in the wood 91 by the cutting edges 51a, 51b cutting forward corresponds to the overall width Wb of the cutting edge region of the blade member 40. On the other hand, in the cutting device (cutting means) 11 employed in this embodiment, the overall width Wa of the support region 77 that rotatably supports the blade member 40 is narrower than the overall width Wb of the cutting edges 51a, 51b. In other words, the width of the center of the blade member 40 in the cutting device (cutting means) 11 is narrower than the overall width Wb of the cutting edge region of the blade member 40. Therefore, the support area 77 that rotatably supports the blade member 40 can enter the kerf of the wood 91 that is formed by the cutting edges 51a, 51b cutting forward. Therefore, according to this embodiment, the blade member 40 cuts beyond the radius as shown in FIG. 10(e). Furthermore, since the blade member 40 is a circular saw, the cut surface of the wood 91 is less likely to be torn. As a result, it can cut thick logs and also transport the cut wood.

[0042] In this embodiment, the drive gear 62 of the drive means 41 of the blade member 40 comes into contact with one side surface of the blade member 40, so that the blade member 40 receives a lateral force from the drive gear 62. In the cutting device (cutting means) 11 of this embodiment, the rotors 67a, 67b, and 67c of the back pressure bearing member 42 are located at a position facing the drive gear 62 of the drive means 41, and the rotors 67a, 67b, and 67c are in contact with the other side surface of the blade member 40. Therefore, the pressing force of the drive gear 62 is applied to the rotors 67a, 67b, and 67c, and the blade member 40 does not bend.

[0043] In the embodiment described above, the drive gear 62 as the driver is brought into contact with one side surface of the blade member 40, but the blade member 40 may be sandwiched between a pair of drive gears. In the embodiment described above, the cutting device 11 is combined with the grapple device 10 to form the attachment 1 for the work vehicle, but a bucket may also be added as in Patent Document 1. The cutting device 11 and the grapple device 10 may be provided with a swinging function or a rotating function. For example, standing trees can be cut by placing the cutting device 11 and the grapple device 10 in a horizontal position.

[0044] The cutting device 11 may be used alone for sawing. For example, the blade member 40 of the cutting device 11 may be attached to a work table so that it can be raised and lowered, and wood may be cut. The cutting device 11 attached to the work table is a device having a blade member 40 and a drive means 41 for driving the blade member 40, and the blade member 40 is circular saw-shaped. That is, the blade member 40 has a circular main body 50 and a saw-tooth cutting blade 51 around the periphery of the main body 50. An engagement portion 53 is provided on the side of the main body 50. The drive means 41 has a drive body that rotates by power, and the blade member 40 is rotatably supported. The drive body engages with the engagement portion 53 of the blade member 40 to rotate the main body 50. The cutting device 11 has a holder 72 that rotatably supports the blade member 40, and the width Wa of the support portion of the holder 72 is narrower than the maximum width Wb of the area where the cutting blade of the blade member is provided.

[0045] The tooth profile of the drive gear 62 is not limited to an involute, but may be a pin gear. The blade member 40 may have a single blade. [Explanation of symbols]

[0046] 1 Work vehicle attachment 2 vehicles 10 Grapple device (grapple component) 11 Cutting device (cutting means) 40 Cutting tool components 41 Driving means 42 Back pressure bearing member 50 Main body 51a, 51b cutting edge 53 Engagement part 62 Drive gear (driver) 72 Holding part 77 Support area 76 Oscillating device 78 Cutting edge accommodation area

Claims

1. An attachment for a work vehicle is attached to a vehicle and has a grapple member that holds an object to be cut, and cutting means that cuts the object to be cut, the cutting means has a blade member and a driving means for driving the blade member, The blade member has a circular main body portion, a saw-tooth cutting edge around the periphery of the main body portion, and an engagement portion on a side surface of the main body portion. The driving means has a driving body that rotates by power, The blade member is rotatably supported, 10. An attachment for a work vehicle, wherein the driver engages with the engaging portion to rotate the blade member.

2. the engaging portion is a row of holes arranged in a circle, the driver is a gear; 2. The attachment for a work vehicle according to claim 1, wherein the gear engages with the hole to rotate the main body.

3. 2. An attachment for a work vehicle according to claim 1, wherein the blade member has a plurality of rows of saw-like cutting edges.

4. The blade member has two plates, and each of the two plates has a saw-like cutting edge on its periphery, 2. An attachment for a work vehicle according to claim 1, wherein the cutting edges of the two plates are inclined or curved outward.

5. An attachment for a work vehicle as described in any one of claims 1 to 4, characterized in that it has a holding portion that rotatably supports the blade member, and the width of the support portion of the holding portion is narrower than the maximum width of the area of ​​the main body portion where the cutting edge is provided.

6. A work vehicle comprising a self-propelled vehicle section and the attachment for a work vehicle according to claim 1.

7. A cutting device having a blade member and a driving means for driving the blade member, The blade member has a circular main body portion, a saw-tooth cutting edge around the periphery of the main body portion, and an engagement portion on a side surface of the main body portion. The driving means has a driving body that rotates by power, The blade member is rotatably supported, The driver engages with the engagement portion to rotate the main body, A cutting device characterized in that it has a holding portion that rotatably supports the blade member, and the width of the support portion of the holding portion is narrower than the maximum width of the area in which the cutting edge of the blade member is provided.

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