JP3806465B2 - Working device for work vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a work device mounted on a work vehicle such as a tractor or a construction vehicle, and more specifically, relates to a device used for mowing work, road surface cleaning work, or the like.
[0002]
[Prior art]
  Conventionally, this type of working apparatus is described in Japanese Patent Laid-Open No. Sho 62-253310. This is a working device for mowing, in which a first arm can be turned up and down by a first cylinder on a vehicle body of a work vehicle, and a second arm supported on a tip portion of the first arm is a second cylinder. Thus, it is possible to rotate in the vertical direction, and mowing the work vehicle while the mower supported at the tip of the second arm 12 is kept at a predetermined height.
[0003]
[Problems to be solved by the invention]
  In the configuration of the above prior art, in order to change the height of the mowing machine while keeping the distance between the vehicle body and the mowing machine constant, it is necessary to rotate the first arm and the second arm. For this reason, if the ground to be mowed has irregularities, the operator needs to finely extend and contract the first and second cylinders according to the irregularities described above, so the operation during mowing becomes complicated. And there existed a problem that work precision fell. Moreover, since the traveling speed of the vehicle is slowed down due to the above complicated operation, the efficiency of the mowing work is poor.
  The same problem occurs when the road surface is cleaned using the above working device.
[0004]
OBJECT OF THE INVENTION
  An object of the present invention is to facilitate operations at the time of work such as mowing work and cleaning work, to improve the work accuracy, and to enable efficient work.
[0005]
[Means for Solving the Problems]
(Invention of Claim 1)
  In order to achieve the above object, for example, as shown in FIG. 1 to FIG. 3 or FIG. 18 to FIG. 20, the work device for a work vehicle is configured as follows. .
  In a state where the first arm 11 supported so as to be pivotable in the vertical direction with respect to the vehicle body 2 is projected in the vehicle width direction W, the upper portion of the second arm 12 is placed near the tip of the first arm 11. The third arm 13 is supported by the lower part of the second arm 12 so as to be rotatable in the vehicle width direction W, and is supported by the lower part of the third arm 13. The work machine 30 is supported so as to be rotatable in the vehicle width direction W, and a first actuator 21 for rotating the first arm 11 is provided, and a second actuator 22 for rotating the second arm 12 is provided. ProvidedThe third arm 13 is supported below the second arm 12 so as to be rotatable in the vehicle width direction W, and the rotation of the third arm 13 in the vehicle width direction W is within a predetermined angle θ. The stop means B which regulates to is provided.
[0006]
(Invention of Claim 2)
  In order to achieve the above object, the invention of claim 2 is configured as follows, for example, as shown in FIGS.
  A boom 90 supported by the vehicle body 2 and rotated in the vertical direction, a first arm 11 supported by the boom 90 and rotated in the vertical direction, and supported by a portion near the tip of the first arm 11. A work device attached to a work vehicle including a second arm 12 that is pivoted up and down,
  With the boom 90 protruding in the vehicle width direction W, the third arm 13 is supported below the second arm 12 so as to be rotatable in the front-rear direction of the vehicle body 2, and the third arm 13 The work machine 30 is supported at the lower part of the vehicle so as to be rotatable in the vehicle width direction W.The third arm 13 is supported below the second arm 12 so as to be rotatable in the vehicle width direction W, and the rotation of the third arm 13 in the vehicle width direction W is within a predetermined angle θ. The stop means B which regulates to is provided.
[0007]
(Invention of Claim 3)
  The invention of claim 3 is obtained by adding the following configuration to the configuration of claim 1 or 2 as shown in FIGS.
  A support portion S supported by the lower portion of the third arm 13 is provided in front of the gravity center G of the mower 30.
[0008]
[0009]
(Claims4Invention)
  Claim4As shown in FIG. 20, for example, in the invention according to any one of claims 1 to 3, the working machine 30 is rotated in the vehicle width direction W below the third arm 13. Are provided with elastic means 101 and 101 for regulating the angle within a predetermined angle.
[0010]
(Claims5Invention)
  Claim5For example, as shown in FIG.4In any of the configurations, another elastic means 102 for suppressing the swing of the third arm 13 in the front-rear direction is provided.
[0011]
(Claims6Invention)
  Claim6For example, as shown in FIG.5In any of the configurations, the adjusting means A for changing the height position of the upper portion of the third arm 13 is provided between the first arm 11 and the second arm 12.
[0012]
[Function and effect]
(Invention of Claim 1)
  For example, as shown in FIGS. 1 to 3 (or FIGS. 18 to 20), the invention of claim 1 operates as follows when used for mowing work.
  As shown in FIG. 1, when the grass on the upper surface and the inner surface of the eaves 9 is cut, the work vehicle 1 is put in the paddy field 7, the first arm 11 is turned up and down, and the second arm 12 is moved in the vehicle width. Rotate in the direction W to move the mower (work machine) 30 along the fence 9.
  Thereafter, the work vehicle 1 is made to travel and the grass of the above-described hoe 9 is cut by the mower 30. When there is a convex portion on the ridge 9 during the above-mentioned cutting, the third arm 13 is rotated backward and upward following the convex portion (see the two-dot chain line diagram in FIG. 3), and the mower is When 30 reaches the concave portion of the flange 9, the third arm 13 in the above-described backward upward rotation posture is rotated back to the front and downward. Thereby, the grass of the reed 9 is smoothly cut by the mower 30.
  Note that the same effect is obtained when the above working machine is used for a road surface cleaning operation.
[0013]
  Therefore, the invention of claim 1 has the following effects.
  During work such as mowing and cleaning, the third arm is automatically rotated in the work direction following the unevenness of the ground to be mowed and the unevenness of the road surface to be cleaned, and the height of the work implement is automatically changed. Therefore, it is difficult to leave behind work such as uncut grass or uncleaned grass.
  Since the above effect is achieved by the third arm automatically turning, the operator does not need to finely operate the first actuator or the second actuator. For this reason, work operations such as mowing and cleaning are facilitated, and operator fatigue can be reduced.
[0014]
  Further, since the work operation is easy, the operator can concentrate on the operation of the work vehicle and increase the operation speed. As a result, work can be performed efficiently.
  In addition, since the operator can concentrate on the traveling operation of the work vehicle, traveling errors are reduced. For this reason, in the case of mowing work, it is possible to prevent the crops in the paddy field or field from being stepped on by the wheels of the work vehicle, thereby increasing the yield.
[0015]
  In addition, the invention of claim 1 operates as follows as shown in FIGS. 1 to 3 and FIG. 11 or FIG.
[0016]
  As shown in FIG. 11, when mowing the inclined surface 65, the traveling direction of the tractor shifts in the vehicle width direction W depending on the state of the entry path such as paddy fields, and the mowing machine. ( Working machine ) 30 is far from the inclined surface 65 There is a case to go around. In this case, a gap is left between the inclined surface 65 and the mowing machine 30, and there is a possibility that uncutting may occur. However, as shown in FIG. 11, the pressing force P is applied to the support portion S by the weight of the mower 30 by using the third arm 13 in an inclined state rotated to the right in the vehicle width direction W. Thus, the mower 30 can be made to follow the inclined surface 65. Thereby, the uncut portion of the inclined surface 65 does not occur.
[0017]
  The third arm 13 operates as follows because the rotation angle in the vehicle width direction W is restricted within the predetermined angle θ by the stop means B.
  As shown in FIG. ( Working machine ) When the grass on the inclined surface 65 is cut by 30, first, the second arm 22 is rotated from the position indicated by the one-dot chain line to the position indicated by the solid line by the second actuator 22, and the left end of the mower 30 is inclined as described above. Touch the surface 65. Then, the clockwise moment acting on the mower 30 due to the reaction force from the inclined surface 65 is received by the stop means B via the third arm 13, so that the mower 30 It is rotated in the surrounding direction and is along the inclined surface 65. In this state, the tractor 1 is driven to cut the grass.
  Note that the same effect is obtained when the above working machine is used for cleaning work.
[0018]
  Therefore, the invention of claim 1 has the following effects.
  Since the third arm is supported at the lower part of the second arm so as to be able to turn in the vehicle width direction, and the stop means for restricting the rotation in the vehicle width direction within a predetermined angle is provided, the work implement is smoothly placed on the inclined surface. It is possible to satisfy both the following and suppressing the work remaining on the inclined surface.
[0019]
(Invention of Claim 2)
  The invention of claim 2 has the same effect as that of the invention of claim 1 described above. However, for example, as shown in FIGS.
  Since it is only necessary to attach the work implement 30 to the existing first arm 11 and second arm 12 provided in the work vehicle 1 via the third arm 13, the first arm 11 and the second arm 12 are connected to each other. There is no need to provide a new one, and the construction of the working device is simplified.
[0020]
(Invention of Claim 3)
  The invention of claim 3 basically operates in the same manner as the invention of claim 1 or 2 described above. For example, as shown in FIG. 1 to FIG. 3 and FIG. To do.
  Since the support portion S for the third arm 13 is provided in a portion in front of the center of gravity G of the mower (work machine) 30, the mower 30 can be mowing while towing the mower 30 when the work vehicle 1 is traveling, and is pushed to mow. Compared with the case, the resistance received by the mower 30 is reduced. As a result, the mowing performance of the mower 30 is improved.
  In addition, when using said working machine for the cleaning work of a road surface, it acts similarly and work performance improves.
[0021]
(Claims4Invention)
  Claim4According to the invention, for example, as shown in FIG. 20, since the elastic means 101 for restricting the rotation of the work machine 30 in the vehicle width direction W is provided within a predetermined angle, the work machine 30 moves in the vehicle width direction. The impact when swung can be buffered by the elastic means 101 described above. For this reason, an excessive force does not act and the life of the working device is extended.
  In the case where the elastic means 101 is configured to be adjustable in height, the rotation angle of the working machine 30 can be set to a value suitable for the working conditions.
[0022]
(Claims5Invention)
  Claim5According to the invention, for example, as shown in FIG. 21, since the other elastic means 102 for suppressing the rotation of the third arm 13 in the front-rear direction is provided, the work resistance received by the work implement from the ground or the road surface is the above. The third arm 13 can be prevented from being excessively swung. For this reason, operations such as mowing and cleaning can be performed more efficiently.
[0023]
(Claims6Invention)
  Claim6According to this invention, for example, as shown in FIG. 15, since the adjusting means A for changing the height position of the upper portion of the third arm 13 is provided, the following effects are further obtained.
  When the hitch height of the vehicle body that supports the first arm 11 is a standard work vehicle, the second arm 12 is used in a contracted state. On the other hand, in the case of a work vehicle in which the hitch height is several hundred mm to 1000 mm higher than the standard, the second arm 12 is used in an extended state. Thereby, the height position of the upper part of the 3rd arm 13 can be located in the substantially same height as a standard work vehicle.
  Therefore, the work device can be shared by different types of vehicles.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
  FIG. 1 to FIG. 12 show a first embodiment of the present invention, and an example in which the present invention is applied to a mowing apparatus will be described.
  First, the overall configuration of the mowing apparatus will be described with reference to FIGS. FIG. 1 is a view of a mowing device viewed from the front side in the traveling direction of a tractor that is a work vehicle. FIG. 2 is an enlarged view of an arrow II portion in FIG. FIG. 3 is a view taken along the line III-III in FIG. FIG. 4 is a plan view of the hitch portion for the mowing apparatus. FIG. 5 is a view taken along the line VV in FIG.
[0025]
  A hitch 3 is attached to the front portion of the vehicle body 2 of the tractor 1 that is a work vehicle, and a mowing device 4 is attached to the hitch 3. In FIG. 1, reference numerals 5 and 5 are wheels, reference numeral 6 is a driving seat, reference numeral 7 is a paddy field, reference numeral 8 is a rice plant, and reference numeral 9 is a straw. In addition, the arrow F in each figure shows the front side of the said tractor 1 in the front-back direction (traveling direction), the arrow R shows the rear side in the front-back direction, and the arrow W shows the vehicle width direction of the tractor 1 same as the above.
[0026]
  The mowing apparatus 4 is configured as follows.
  The first arm 11 is supported by the bracket 10 supported by the hitch 3 so as to be rotatable in the vertical direction, and the first arm 11 is rotated by a first hydraulic cylinder (first actuator) 21. As shown mainly in FIGS. 4 and 5, the bracket 10 is supported around the pivot pin 14 so as to be horizontally rotatable. Then, any one of the five positioning holes 16 of the bracket 10 and the support hole 15 of the hitch 3 are connected by a pin 17 so that the bracket 10 and the first arm 11 are on both the left and right sides in the vehicle width direction. The position can be changed to five positions, that is, an oblique front position and a front position.
[0027]
  As shown in FIG. 1, in the state where the first arm 11 is projected in the vehicle width direction W, the upper portion of the second arm 12 is in the vehicle width direction W. It is rotatably supported. The second arm 12 is configured in a parallel link type and is rotated by a second hydraulic cylinder (second actuator) 22.
[0028]
  As shown in FIGS. 1, 2, and 3, a parallel link type third arm 13 is supported at the lower portion of the second arm 12. The third arm 13 is rotated in the front-rear direction of the vehicle body 2 by a plurality of connecting pins 18 and can also be rotated in the vehicle width direction W by a ball joint 19 fitted on the connecting pin 18. The As shown in FIG. 2, stop means B is provided for restricting the rotation of the third arm 13 in the vehicle width direction W within a predetermined angle θ. The stop means B is constituted by left and right side walls 26 a and 26 a of the upper link portion 26 of the third arm 13.
[0029]
  A mowing machine 30 is supported on the lower link portion 27 of the third arm 13 by a connecting pin 29 so as to be rotatable in the vehicle width direction W. A specific structure of the mower 30 will be described with reference to FIGS.
  FIG. 6 is a plan view of the mower 30. FIG. 7 is a view taken along the line VII-VII in FIG. FIG. 8 is a view taken along the line VIII-VIII in FIG. FIG. 9 is a schematic diagram showing a power transmission system of the mower 30.
[0030]
  The frame 30a of the mower 30 includes a first frame 31 and a second frame 32, and these two frames 31 and 32 can be bent at a desired angle in the vertical direction by the hinge means 33. The hinge means 33 includes a plurality of hinges and positioning pins that adjust the bending angle, although not specifically shown. Each of the frames 31 and 32 is provided with a guide plate 34 for guiding the grass to be cut down.
[0031]
  Roller-type guide wheels 35 and auxiliary wheels 36 are supported on the first frame 31. The second frame 32 also supports the roller type guide wheel 37 and the auxiliary wheel 38. Each of the wheels 35, 36, 37, and 38 is attached so that its height can be adjusted, whereby the cutting height can be adjusted. Moreover, each auxiliary wheel 36 and 38 is comprised so that the angle of the advancing direction can be adjusted, and, thereby, the straightness of the mower 30 is improved.
[0032]
  A first cutter 41 is rotatably supported on the first frame 31, and a second cutter 42 is rotatably supported on the second frame 32. These cutters 41 and 42 are driven as follows.
  The hydraulic motor 44 provided on the first frame 31 is connected to the hydraulic pump unit of the tractor 1 by a hydraulic hose (none is shown). The rotation of the hydraulic motor 44 is transmitted to the first cutter 41 through the first pulley 45, the V belt 46, the second pulley 47, the first bevel gear 51, and the second bevel gear 52 in order. At the same time, the rotation of the second bevel gear 52 is transmitted to the second cutter 42 through the third bevel gear 53, the propeller shaft means 49, the fourth bevel gear 54, and the fifth bevel gear 55 in this order.
[0033]
  The propeller shaft means 49 includes two universal joints 57 and 57 and a telescopic transmission member 58. The transmission member 58 is configured by fitting the inner member 59 and the outer member 60 so that the inner member 59 and the outer member 60 can rotate and extend in the axial direction. Accordingly, power can be smoothly transmitted to the second cutter 42 even when the second frame 32 is bent at a desired angle with respect to the first frame 31.
[0034]
  The first frame 31 of the mower 30 is provided with a support portion S, and the support portion S is supported by the lower link portion 27 of the third arm 13 (see FIG. 1). Said support part S is provided in the front part rather than the gravity center position G of said mowing machine 30. FIG. As a result, when the tractor 1 moves forward, the mower 30 can be trimmed and the mower 30 receives less resistance than when the mower 30 is pushed and trimmed, so that the mowing performance is improved.
[0035]
  The operation of the mowing apparatus 4 will be described mainly with reference to FIGS. 1 and 10 to 12.
  As shown in FIG. 1, when the grass on the upper surface and the inner surface of the culm 9 is to be cut, the tractor 1 is placed in the paddy field so that the wheels 5 and 5 are located between the rice stocks 8 and 8, and the first arm 11 is The second arm 12 is rotated in the vertical direction and the second arm 12 is rotated in the vehicle width direction W so that the wheels 35 and 36 of the first frame 31 of the mower 30 are placed on the upper surface of the rod 9 (see FIGS. 6 to 8). ). Next, the second frame 32 is bent with respect to the first frame 31, and the wheels 37 and 38 of the second frame 32 are placed on the inner surface of the flange 9 (see FIGS. 6 to 8).
[0036]
  Thereafter, the tractor 1 is moved forward while rotating the cutters 41 and 42 (see FIG. 8) of the mowing machine 30, and the grass on the upper surface and the inner surface of the rod 9 is simultaneously cut. When there is a convex portion on the ridge 9 during the above-mentioned cutting, the third arm 13 is rotated backward and upward following the convex portion (see the two-dot chain line diagram in FIG. 3), and the mower is When 30 reaches the concave portion of the flange 9, the third arm 13 in the above-described backward upward rotation posture is rotated back to the front and downward. Thereby, the grass on the upper surface and the inner surface of the basket 9 is smoothly cut by the mower 30. Even when an obstacle collides with the mower 30 described above, the third arm 13 is rotated rearward and upward similarly to the above, so that the obstacle can be avoided smoothly.
[0037]
  FIG. 10 is a partial view corresponding to FIG. 1 and shows a case where the grass on the inclined surface 65 is cut by the mower 30. The mower 30 is used in a state where the first frame 31 and the second frame 32 are extended straight. When mowing, first, the first arm 11 is rotated from the position of the one-dot chain diagram to the position of the solid diagram by the second cylinder 22, and the left end of the mower 30 is brought into contact with the inclined surface 65. Then, a counterclockwise moment acts on the mower 30 by the reaction force from the inclined surface 65 and the clockwise moment is received by the stop means B via the third arm 13, so that the third arm 13, the mower 30 is rotated in the clockwise direction along the inclined surface 65. In this state, the tractor 1 is moved forward to mow.
[0038]
  As shown in FIG. 11, the third arm 13 further acts as follows.
  During mowing, the tractor generally travels in a direction perpendicular to the paper surface in the figure. However, depending on the state of the loading path between rice paddies in the paddy field, the tractor moves away from the inclined surface 65 as the tractor travels. There is a case. In this case, since the mowing machine 30 is also moved away from the inclined surface 65, a gap is left between the inclined surface 65 and the mowing machine 30, and there is a possibility that uncutting may occur. However, as shown in FIG. 11, the pressing force P is applied to the support portion S by the weight of the mower 30 by using the third arm 13 in an inclined state rotated to the right in the vehicle width direction. The mower 30 can be made to follow the inclined surface 65. Thereby, there is no uncut portion on the inclined surface 65.
[0039]
  The above-described third arm 13 is configured to be rotatable in the vehicle width direction and has the following advantages in that the rotation is restricted to a predetermined angle by the stop means B.
  If the third arm 13 is configured to be unrotatable in the vehicle width direction W with respect to the second arm 12, the mower 30 moves away from the inclined surface 65 as the tractor 1 moves away from the inclined surface 65. Therefore, there is a risk of uncutting. In order to solve this problem, it is sufficient to operate the first arm 11 and the second arm 12 to bring the mower 30 closer to the inclined surface 65, but this makes the operation of the arms 11 and 12 complicated. The operator is burdened.
[0040]
  Further, if the third arm 13 is configured to be rotatable in the vehicle width direction W with respect to the second arm 12, the counterclockwise moment action is exerted on the mower 30 by the reaction force at the time of mowing on the inclined surface 65. Then, the third arm 13 is freely rotated in the counterclockwise direction by the moment and the mowing machine 30 is returned to the horizontal posture, so that mowing cannot be performed.
[0041]
  According to this embodiment, as described above, by restricting the rotation of the third arm 13 in the vehicle width direction W to a predetermined angle, the inclined surface 65 is the same as preventing the uncut portion of the inclined surface 65 from being left behind. Therefore, it is possible to make the mower 30 fit smoothly.
  2 is preferably in the range of 10 to 30 degrees, and more preferably in the range of 10 to 20 degrees.
[0042]
  In addition, according to the mowing apparatus 4 of this embodiment, as shown in FIG. 12, it is also possible to mow the outer inclined surface 70 seeing from the tractor side.
[0043]
  13 to 17 show a first modification to a fourth modification.
  FIG. 13 shows a first modification and corresponds to FIG. 2 described above. In this case, the stop means B of the third arm 13 is constituted by adjusting bolts 72 screwed into the left and right side walls 26a and 26a of the upper link portion 26.
[0044]
  FIG. 14 shows a second modification and is a partial view of the first arm 11 and the second arm 12 of the mowing apparatus. In this case, the tip portion 76 is supported on the base portion 74 of the first arm 11 by a pivot pin 75 so as to be rotatable up and down, and the support hole 77 provided in the base portion 74 and the adjustment provided in the tip portion 76 are provided. By inserting a pin (not shown) into the hole 78, the rotation angle of the tip portion 76 can be adjusted. The height position of the upper part of the third arm 13 (see FIG. 1) can be changed by the adjusting means A having the above-described configuration, and the tractor of the model in which the height position of the hitch 3 in FIG. The standard type mowing apparatus 4 can also be applied.
[0045]
  That is, when the height position of the hitch 3 is a standard tractor, the base portion 74 and the tip portion 76 are fixed in a straight state. On the other hand, in the case of a tractor where the height position of the hitch 3 is several hundred mm to 1000 mm higher than the standard height, as shown in FIG. 14, the tip portion 76 is rotated downward. Fix it. As a result, the height position of the upper portion of the third arm 13 (not shown here) can be positioned substantially the same as the standard tractor. For this reason, the mowing apparatus 4 can be shared by different tractors.
[0046]
  FIG. 15 shows a third modification and corresponds to FIG. 14 described above. In this case, the adjusting means A is provided on the second arm 12. That is, the left and right link portions 80 of the second arm 12 can be expanded and contracted in the vertical direction and fixed to a desired length. Reference numeral 81 denotes a height adjustment hole into which a pin (not shown) is inserted. The height position of the upper part of the third arm 13 can be changed by expanding and contracting the link portion 80.
[0047]
  16 and 17 show a fourth modification. FIG. 16 is a plan view of the connecting portion between the second arm 12 and the third arm 13. FIG. 17 is a view taken along the line XVII-XVII in FIG.
  In this case, the upper link portion 26 of the third arm 13 is supported on the lower link portion 12 a of the second arm 12 by a pivot pin 83 so as to be pivotable in the horizontal direction, and the third arm 13 is supported by the connecting pin 84. It is configured to be lockable at a desired turning position. Reference numeral 85 denotes a support hole into which the connecting pin 84 is inserted.
[0048]
  By locking the third arm 13 at a desired turning position, the mower 30 can be turned to a desired position in accordance with the terrain to be cut, so that mowing that conforms to the terrain can be efficiently performed. It has become possible.
  In addition, you may provide said turning and turning lock mechanism in the connection part of the lower link part 27 of said 3 arms 13, and said mower 30 etc. FIG.
[0049]
  The first embodiment and the modification examples described above can be further modified as follows.
  The first frame 31 and the second frame 32 of the mower 30 can be configured to be attachable and detachable, and the two frames 31 and 32 can be disposed on the target of the state shown in FIG. The cutter of the mower 30 is not limited to two, and may be one or three or more.
  The mowing machine 30 may be configured so that it cannot be bent.
  The first arm 11 may be configured to protrude only to one side in the vehicle width direction.
[0050]
(Second embodiment)
  18 to 20 show a second embodiment of the present invention. FIG. 18 is a schematic plan view of the work vehicle during mowing work. FIG. 19 is an arrow view taken along line XIX-XIX in FIG. FIG. 20 is a view taken along the line XX-XX in FIG. In the second embodiment, elements having the same configuration as in the first embodiment are given the same reference numerals in principle.
[0051]
  In the second embodiment, a crawler excavator 1 provided with a mowing device 4 is illustrated.
  In other words, the swivel base 89 is turnably supported on the vehicle body 2 driven by the crawlers 5 and 5, and the boom 90 is supported on the swivel base 89 so as to be turnable in the vertical direction by a boom cylinder (not shown). An arm 91 is supported at the tip of the boom 90 by an arm cylinder (not shown) so as to be rotatable in the vertical direction. A hitch 92 is supported on the arm 91 by a pin 94 so as to be pivotable in the vertical direction, and the hitch 92 is pivoted by the bucket cylinder 22 via two links 95 and 96.
[0052]
  The above-described first arm 11 is constituted by the arm 91, and the above-described first hydraulic cylinder (first actuator) is constituted by the above-described arm cylinder not shown. The hitch 92 constitutes the second arm 12 described above, and the bucket cylinder 22 constitutes the second hydraulic cylinder (second actuator).
[0053]
  A bracket 97 is supported on the lower surface of the hitch 92 so as to be pivotable in the horizontal direction by a pivot pin 98, and the bracket 97 is fixed at a predetermined pivot position by a plurality of positioning tools (pins, bolts, etc.) 99.
  A parallel link type third arm 13 is supported by the bracket 97 so as to be rotatable in the front-rear direction. The third arm 13 includes left and right link portions 13 a and 13 a and a lower link portion 13 b connected by a pin 18. The mower 30 is supported on the lower link portion 13b by the connecting pin 29 so as to be rotatable in the vehicle width direction W. The rotation angle of the mower 30 in the vehicle width direction W is regulated by elastic means 101 and 101 made of rubber cushion.
[0054]
  The elastic means 101 is attached to the lower link portion 13b so as to be adjustable in height. Accordingly, the mower 30 can adjust the angle at which the rotation is allowed from 0 degree to a desired angle, and can efficiently mowing according to the inclination angle of the ground to be mowed. The elastic means 101 may use a coil spring, a leaf spring, an air spring or the like instead of the rubber cushion.
[0055]
  FIG. 18 shows an example of the usage state of the mowing device 4 described above.
  In this case, the swivel base 89 is turned sideways, and the boom 90 and the arm 91 are projected in the vehicle width direction W. In this state, the excavator 1 travels forward, and the mower 30 cuts the constant width region K along the forward direction.
  At the time of the above-mentioned traveling cutting, the link type third arm 13 can be similarly rotated in both the front and rear directions (see FIG. 19), so even when the hydraulic excavator 1 is moved backward. You can mow the same way. Therefore, the work efficiency is doubled compared to the mowing apparatus that can work only in one of the forward and backward directions.
[0056]
  FIG. 21 shows a modification of the mowing apparatus, and is a partial view corresponding to FIG. In this case, tension coil springs (another elastic means) 102 and 102 for restricting the rotation of the third arm 13 in the front-rear direction are provided. Each spring 102 is mounted between the lower link portion 13b of the third arm 13 and the bracket 97, and a guide shaft 103 is inserted therethrough.
  The spring 102 and the shaft 103 may be mounted between the left and right link portions 13a and 13a. Further, the spring 102 may be a compression coil spring instead of the tension coil spring, and can be replaced by another elastic means such as rubber.
[0057]
  FIG. 22 shows another working state and corresponds to FIG. 18 described above.
  In this case, the swivel base 89 is swung forward, and the boom 90 and the arm 91 are projected forward. In this state, first, the swivel base 89 is reciprocally swung to cut the area M, then the excavator 1 is advanced, and then the swivel base 89 is swung to cut the area N. Is repeated.
  Even during the above-described turning cutting, the link-type third arm 13 (see FIG. 19) can rotate in both the left and right directions in FIG. Therefore, the work efficiency is doubled compared to the mowing apparatus that can work only in one direction.
[0058]
  FIG. 23 shows still another working state and corresponds to FIG.
  The case of FIG. 23 is the same as the case of FIG. 18 described above in that the swivel base 89 is turned sideways and the boom 90 and the arm 91 are projected in the vehicle width direction W. 30 differs in that it is pivoted by 90 degrees and mounted.
[0059]
  In the state shown in FIG. 23, first, the mowing machine 30 is reciprocated in the left-right direction by turning the boom 90 in the up-and-down direction, and the mowing of the region X is performed. Then, the excavator 1 is advanced, and subsequently the same as above. The mowing machine 30 is reciprocated in the left-right direction by the pivoting of the boom 90 in the up-and-down direction, the mowing of the area Y is performed, and the above operation is repeated.
  Even during the boom rotation mowing described above, the link-type third arm 13 (see FIG. 19) can rotate in both the left and right directions in FIG. Therefore, the work efficiency is doubled compared to the mowing apparatus that can work only in one direction.
[0060]
  Each of the above embodiments and modifications can be further modified as follows.
  The work vehicle may be another type of agricultural vehicle or construction vehicle instead of a tractor or a hydraulic excavator.
  The working machine may be a vacuum cleaner for cleaning a road, a factory floor, or the like, instead of the mower.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of the present invention and is a view of a mowing device viewed from the front side in the traveling direction of a work vehicle.
FIG. 2 is an enlarged view of an arrow II portion in FIG.
3 is a view taken along the line III-III in FIG.
FIG. 4 is a plan view of the hitch portion for the mowing apparatus.
FIG. 5 is a view taken along the line VV in FIG.
FIG. 6 is a plan view of the mower of the mowing apparatus.
7 is a view taken along the line VII-VII in FIG.
FIG. 8 is a view taken along the line VIII-VIII in FIG.
FIG. 9 is a schematic diagram showing a power transmission system of the mowing machine.
FIG. 10 is a diagram illustrating a usage state of the mowing apparatus.
FIG. 11 is a diagram showing another usage state of the mowing apparatus.
FIG. 12 is a view showing still another usage state of the mowing apparatus.
FIG. 13 is a view showing a first modified example and corresponding to FIG. 2 described above.
FIG. 14 is a partial view of a first arm and a second arm of a mowing apparatus, showing a second modification.
FIG. 15 shows a third modification and corresponds to FIG. 14 described above.
FIG. 16 is a plan view of a connecting portion between the second arm and the third arm of the mowing apparatus, showing a fourth modification.
17 is a cross-sectional view taken along line XVII-XVII in FIG.
FIG. 18 is a schematic diagram of a work vehicle in plan view showing a second embodiment of the present invention and working with a mowing device.
FIG. 19 is a view taken along the line XIX-XIX in FIG. 18, and corresponds to FIG. 3 described above.
20 is a view taken along the line XX-XX in FIG. 18 of the same, and corresponds to FIG. 1 described above.
FIG. 21 is a partial view corresponding to FIG. 19, showing a modification of the mowing apparatus.
FIG. 22 is a view corresponding to FIG. 18 showing another working state of the work vehicle.
FIG. 23 is a view corresponding to FIG. 18 showing still another working state of the work vehicle.
[Explanation of symbols]
  DESCRIPTION OF SYMBOLS 2 ... Vehicle body, 11 ... 1st arm, 12 ... 2nd arm, 13 ... 3rd arm, 21 ... 1st actuator (1st hydraulic cylinder), 22 ... 2nd actuator (2nd hydraulic cylinder), 30 ... Mowing machine, A ... adjusting means, B ... stop means, G ... center of gravity position of mower 30, 101 ... elastic means (rubber cushion), 102 ... another elastic means (spring), S ... support portion, W ... vehicle width direction, θ ... A predetermined angle.

Claims (6)

With the first arm (11) supported so as to be pivotable in the vertical direction with respect to the vehicle body (2) protruding in the vehicle width direction (W), the first arm (11) is located near the tip. The upper part of the two arms (12) is supported so as to be pivotable in the vehicle width direction (W), and the third arm (13) is attached to the lower part of the second arm (12). The work machine (30) is supported below the third arm (13) so as to be rotatable in the vehicle width direction (W), and the first arm (11) is supported. A first actuator (21) for rotating the second arm (12) and a second actuator (22) for rotating the second arm (12) ,
Said third arm (13) at the bottom along with also rotatably supporting the vehicle width direction (W) of said second arm (12), the third vehicle width direction of the arm (13) (W) A working device for a working vehicle, comprising stop means ( B ) for restricting rotation to within a predetermined angle ( θ ) . A boom (90) supported by the vehicle body (2) and rotated in the vertical direction, a first arm (11) supported by the boom (90) and rotated in the vertical direction, and the first arm ( 11) a work device that is attached to a work vehicle that includes a second arm (12) that is supported by the tip end portion of 11) and is rotated in the vertical direction.
With the boom (90) projecting in the vehicle width direction (W), the third arm (13) can be rotated in the front-rear direction of the vehicle body (2) below the second arm (12). The work machine (30) is supported by the lower part of the third arm (13) so as to be rotatable in the vehicle width direction (W) ,
Said third arm (13) at the bottom along with also rotatably supporting the vehicle width direction (W) of said second arm (12), the third vehicle width direction of the arm (13) (W) A working device for a working vehicle, comprising stop means ( B ) for restricting rotation to within a predetermined angle ( θ ) . In the working device for a work vehicle according to claim 1 or 2,
For a working vehicle, characterized in that a support portion (S) supported by a lower portion of the third arm (13) is provided in front of the center of gravity (G) of the work machine (30). Work equipment. In the working device for work vehicles according to any one of claims 1 to 3,
Elastic means (101) (101) for restricting the rotation of the work implement (30) in the vehicle width direction (W) within a predetermined angle is provided below the third arm (13). A working device for a working vehicle. In the working device for work vehicles according to any one of claims 1 to 4 ,
A working device for a working vehicle, characterized in that another elastic means (102) for suppressing the third arm (13) from rotating in the front-rear direction is provided. In the working device for work vehicles according to any one of claims 1 to 5 ,
Adjusting means (A) for changing the height position of the upper part of the third arm (13) is provided between the first arm (11) and the second arm (12). A working device for a working vehicle.

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