JP5231363B2 - Working machine stand device - Google Patents

Description

  The present invention relates to a stand device for a work machine.

  On a working machine such as a rotary tiller mounted on a tractor vehicle body via a link mechanism, the stand is attached to a stand posture for allowing the work device to stand on its own and a storage posture in which the stand is rotated to be stored. Some conventional stand devices for work machines of this type are provided with a lock device for fixing the stand to a stand posture and a storage posture (for example, Patent Document 1).

JP-A-6-276802

Therefore, conventionally, the stand cannot be changed in posture by remote control from the tractor vehicle body side. When changing the stand to the stand posture or the storage posture, the stand of the work machine is lowered from the tractor vehicle body. The position of the stand must be changed, and the work of changing the position of the stand was troublesome.
In view of the above problems, the present invention makes it possible to easily change the posture of a stand of a working machine such as a rotary tiller while being mounted on a tractor body.

The technical means of the present invention for solving this technical problem is that a pair of left and right support arms protrudes rearward from a working machine having a rotary tiller mounted on a tractor body via link means, and the support arms A horizontal connecting rod is connected and fixed between the front end portions of the slab, and the stand is stored in the horizontal connecting rod so as to follow the horizontal connecting rod by rotating upward with a stand posture for self-supporting the working machine around the support shaft in the front-rear direction. It is attached to the storage posture so that the posture can be changed freely,
A stand urging means for urging the stand from the stand posture to the stowed posture is provided, a cable for remotely operating the stand to change the posture from the stowed posture to the stand posture, and an operation in which the cables are connected The lever is provided on the work machine side so that it can be operated from the tractor body.

Therefore, by operating the operating lever to which the cable is connected from the tractor body, it is possible to easily change the position of the stand of the working machine such as a rotary tiller between the stand position and the storage position while it is mounted on the tractor body. it can.
According to another technical means of the present invention, the operating lever is pivoted about a pivot position between a stand position that brings the stand into a stand position when the cable is pulled and a storage position that places the stand in the stowed position when the cable tension is released. The lever biasing means for biasing the operation lever from the storage position to the stand position is provided. When the operation lever is swung to the storage position, the stand biasing means is provided with a lever. The biasing force is larger than the biasing means, and the lever biasing means is set so that the biasing force is larger than that of the stand biasing means when the operating lever is swung to the stand posture.

Therefore, when the stand is changed between the stand posture and the storage posture, the urging force of the stand urging means and the urging force of the lever urging means cancel each other, and the posture can be easily changed with a light force by operating the operation lever. be able to.
Another technical means of the present invention is that the cable is guided in a substantially arc shape around the rotation center of the stand so as to guide the cable around the rotation center of the stand when changing the posture of the stand. The cable guide is provided.

Accordingly, when changing the posture, the stand can be smoothly rotated with a uniform force around the rotation center.
According to another technical means of the present invention, a pair of left and right stands are provided with respect to a work machine, and a pair of left and right cables, a stand biasing means, and an operating lever are provided corresponding to the pair of stands. There is in point.

Therefore, the left and right balance is improved.
Another technical means of the present invention is that the stand biasing means is constituted by a torsion coil spring or a tension coil spring , and the stand biasing means is disposed on the front side of the stand .

  According to the present invention, the operation lever to which the cable is connected is operated from above the tractor body, and the stand of the working machine such as a rotary tiller can be easily placed between the stand position and the storage position while remaining on the tractor body. Can be changed.

It is a side view which shows the state by which the rotary tiller was mounted | worn by the rear part of the tractor vehicle body which shows one Embodiment of this invention. It is a side view of the stand part. It is a rear view of the stand part. It is a top view of the stand part. It is a rear view of the state which made the stand into the stand posture. It is a rear view of the state which made the stand the storage posture. It is a side view of the clamping member. It is a side view of the operation lever part. It is a rear view of the same top mast and operation lever part. It is a side view of the stand part which shows other embodiment. It is a rear view of the stand part. It is a top view of the stand part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a tractor, on which a hydraulic device for raising and lowering a work implement having left and right lift arms is mounted on the rear portion of the tractor vehicle body 2, and a PTO shaft protruding rearward at the lower rear surface of the tractor vehicle body 2 3, the left and right rear wheels 4 are covered with a rear wheel fender 5, and a driver seat 6 is provided between the left and right rear wheel fenders 5.

A rotary tiller (work machine) 11 is detachably connected to the rear portion of the tractor vehicle body 2 via a connecting device (auto hitch having a link means) 13.
The rotary cultivator 11 employs a side drive type rotary in the present embodiment. The rotary cultivator 11 includes a rotary machine frame 14 and a rotary tiller 15 provided at the lower part of the rotary machine frame 14. And a rotary cover 16 that covers the rotary tiller 15.

The upper part of the rotary machine frame 14 is fixed to the outer side of the left and right support arms 18 and a pair of left and right support arms 18 projecting outward in the left and right directions from the left and right sides of the gear case 17. The transmission case 19 and a side frame (not shown) having an upper portion fixed to the outer end side of the right support arm 18 are provided.
The rotary tiller 15 includes a claw shaft 21 that is rotatably supported around a shaft center in the left-right direction between the lower portion of the transmission case 19 and the side frame, and a plurality of tilling claws attached and fixed on the claw shaft 21. 22 and rotating the claw shaft 21 around the axis in the left-right direction in the direction of arrow A, the tilling claw 22 enters the soil while rotating around the claw shaft 21, It is configured to be cultivated and crushed and released to the rear.

  The gear case 17 is provided with a PIC shaft 24 that is interlocked and connected to the PTO shaft 3 projecting rearward from the rear portion of the tractor vehicle body 2 via a joint device, and the power transmitted from the PTO shaft 3 to the PIC shaft 24 is the gear case. The power input to the gear case 17 is transmitted from the transmission shaft provided in the left support arm to the claw shaft 21 via the transmission mechanism in the transmission case 19, and the power causes the power to be transmitted to the claw shaft 21. The claw shaft 21 is rotationally driven in the direction indicated by the arrow A and is plowed down.

The rotary cultivator 11 may be a center drive rotary, and the cultivating method may be an up-cut cultivating method in which the claw shaft 21 rotates in the direction opposite to the arrow A direction.
A top mast 28 is provided on the gear case 17 so as to protrude upward, and an upper connecting portion 30 constituted by pins arranged in the left-right direction is fixed to the front upper portion of the top mast 28.

A connecting bracket 31 is fixed to each of the left and right support arms 18, and a lower connecting portion 32 formed of a pin that protrudes outward in the left-right direction is provided on the front end side of each of the left and right connecting brackets 31. ing.
The connecting device 13 includes link means having an upper top link 33 and a pair of lower left and right lower links 34, and on the rear end side (rotary tiller 11 side) of these top links 33 and left and right lower links 34. It has a hitch frame 35 which is connected and gives a fixed shape to the top link 33 and the left and right lower links 34.

A front end side (tractor vehicle body 2 side) mounting portion 33a of the top link 33 is pivotally connected to a top link bracket 36 provided at the upper rear portion of the rear portion of the tractor vehicle body 2, and the front end side (tractor vehicle body 2 of the left and right lower links 34). The side) mounting portion 34a is pivotally connected to the lower side portion on the same side in the left-right direction of the rear portion of the tractor vehicle body 2.
The hitch frame 35 includes a main frame 37 formed by bending a square pipe material into a mountain shape when viewed from the front, an upper member 38 provided on the top of the main frame 37, and lower left and right sides of the main frame 37. The lower member 39 is provided.

A rear end side (rotary cultivator 11 side) attachment portion 33b of the top link 33 is pivotally connected to the front portion side of the upper member 38, and the upper connection portion 30 is connected to the rear portion side of the upper member 38. An upper coupled portion 40 formed of an open concave portion is formed on the upper side that can be engaged (fitted) from the lower side.
A lower link pin 27 projects outwardly on the front side of each of the left and right lower members 39, and a rear end side (rotary cultivator 11 side) mounting portion 34b on the same side in the left-right direction is provided. It is pivotally connected by a lower link pin 27, and a rear-opening recessed portion in which the lower connecting portion 32 on the same side in the left-right direction can be engaged (fitted) from the rear on the rear side of the lower member 39. The lower engaging part 41 which consists of is formed.

Each of the left and right lower members 39 is provided with a locking member that prevents separation from the lower engaging portion 41 of the lower connecting portion 32 in a state where the lower connecting portion 32 is engaged with the lower engaging portion 41. The stop member can be freely released by a release lever (not shown), and the lower cover portion 32 is pivotally connected by a locking member and the lower engagement portion 41 so that the lower connection portion 32 can be pivoted about a horizontal axis. A connecting portion is configured.
A pair of left and right lift arms are disposed above the rear end side of the tractor vehicle body 2 and are connected to a middle part in the front-rear direction of the lower link 34 on the same side in the left-right direction via a lift rod. It is configured to move up and down.

Support arms 45 protrude rearward from the rear end portions of the left and right connection brackets 31, and base portions of the plurality of support arms 45 are connected to the connection bracket 31 so as to be swingable about a horizontal axis 46. A lateral connecting rod 47 is connected and fixed between the distal ends of the pair of support arms 45. A pair of stands 49 are provided on the left and right sides of the horizontal connecting rod 47.
A height adjusting means 54 for adjusting the height of the stand 49 is provided between the top mast 28 and the middle part of the support arm 45 via a connecting arm 52 or the like.

  The height adjusting means 54 is provided so as to extend from the upper end side of the top mast 28 to the distal end side of the connecting arm 52, and has a telescopic rod 55 that can be stretched in the length direction. The handle 57 is configured to expand and contract by rotating. The operation handle 57 can be operated from the driver's seat 6 side of the tractor 1. The pair of stands 49 is vertically adjusted by extending and retracting the telescopic rod 55 and rotating the support arm 45 about the horizontal axis 46.

2 to 6, U-shaped fixing brackets 60 are provided on the left and right lower surfaces of the horizontal connecting rod 47, and the pair of fixing brackets 60 includes a front side wall 61, a rear side wall 62, and front and rear side walls 61, 62. It has a connection ceiling wall 63 that connects the upper ends, and the connection ceiling wall 63 is fixed to the lower surface of the lateral connection rod 47 by a fastener 64 such as a bolt.
The base of the stand 49 is disposed between the front and rear side walls 61 and 62 of the fixed bracket 60, is supported to be swingable about a support shaft 65 in the front-rear direction, and protrudes downward from the lateral coupling rod 47; The posture is freely changeable from the stand posture X to the storage posture Y along the lower surface of the lateral coupling rod 47 by swinging inward in the left-right direction around the support shaft 65. A cylindrical member 69 is provided on the front side wall 61 of the fixed bracket 60 so as to project forward.

A fan-shaped rotating member 70 is fixed on the left side (stand posture X) to the lower surface (storage posture Y) on the base side of the stand 49.
The cylindrical member 69 is fitted with a stand biasing means 73 made of a torsion coil spring or the like, and one end side of the torsion coil spring 73 is latched by a locking pin 74 provided in the middle of the stand 49. The other end side of the torsion coil spring 73 is hooked on a spring hooking portion 76 provided on the front side wall 61 of the fixed bracket 60, and the stand 49 is stored from the stand posture X by the biasing force of the torsion coil spring 73. It is always urged in the direction of turning to the posture Y. As shown in FIG. 3 and FIG. 7, a clamping member 75 is provided on the inner side in the left-right direction of the horizontal connecting rod 47, and the clamping member 75 detachably holds the middle part of the stand 49 whose posture is changed to the storage posture Y. Then, the stand 49 is held in the storage posture Y.

  Further, an outer attachment portion 81 for attaching one end side of the outer cable 80 of the Bowden cable 79 is provided on the rear side wall 62 of the fixed bracket 60, and the outer cable 80 is attached to the outer attachment portion 81 via an attachment mechanism 83. It is attached so that the position in the length direction can be adjusted. The inner cable 82 protrudes from the attachment mechanism 83 and is connected to the rotating member 70 through the cable connecting body 85 so as to be swingable around the support shaft 87 in the front-rear direction.

Further, on the left side or the lower side of the rotating member 70, a cable guide 84 that is formed in a substantially arc shape centering on the support shaft 65 and guides the inner cable 82 is provided.
In the case of the above configuration, when the stand 49 is in the storage posture Y, the inner cable 82 is wound around the cable guide 84 of the cable guide 84, and the inner cable 82 is pulled from this state. The rotating member 70 rotates about the support shaft 65 together with the stand 49 to rotate the stand 49 to the stand posture X.

  By the way, if the rotating member 70 is linearly pulled by the inner cable 82 to rotate the stand 49 to the stand posture X, the stand 49 cannot be smoothly rotated by 90 °. In the embodiment, the rotation member 70 provided with the arcuate cable guide 84 centered on the support shaft 65 is provided, so that when the stand 49 is rotated by pulling the inner cable 82, the inner cable 82 is not pulled linearly, but is pulled so as to move on an arc line centered on the support shaft 65, whereby the stand 49 can be smoothly rotated by approximately 90 ° with a uniform force.

Further, when the tension force of the inner cable 82 is released in the stand posture X of the stand 49, the stand 49 is changed to the storage posture Y by the urging force of the stand urging means 73.
In addition, the cable guide 84 is not limited to the thing of the said structure, You may make it guide by one or several pins.

As shown in FIGS. 1 and 8 to 9, the top mast 28 is provided with a pair of left and right operation levers 86 for remotely operating the stand 49 corresponding to the left and right stands 49.
As shown in FIGS. 8 to 9, the top mast 28 is composed of a pair of left and right constituent members 28 a made of a plate material, and the operation lever 86 is located on the outer side (left and right sides) of the constituent members 28 a of the top mast 28. (Outside the direction).

  On the lower side of the top mast 28, pivots 88 having left and right axial centers are respectively provided on the left and right component members 28a, and the lower front portions of the respective operation levers 86 are arranged around the pivots on the pivots 88. The operation levers 86 are supported so as to be rotatable and immovable in the axial direction, and the operation levers 86 are flexible so as to bend in the left and right directions. The operation levers 86 can swing left and right with the rotation support portion as a fulcrum. It is said that.

A cable connecting piece 89 for connecting the inner cable 82 of the Bowden cable 79 located on the same left and right side is provided in the middle of the left and right operation levers 86. The cable connecting piece 89 is inserted into the mounting hole 90 of the operation lever 86 and fixed by welding or the like.
A guide plate 92 is fixed on the rear side of each component member 28a. The guide plate 92 has an outer wall portion 92a and a guide wall portion 92b bent at a right angle on the rear side of the outer wall portion 92a, and a guide groove 93 cut out in a U-shape is provided in the guide wall portion 92b. It has been.

A cable stay 95 located on the lower side of each operation lever 86 is fixed to the rear lower portion of each guide plate 92 so as to protrude rearward. The cable stay 95 is located on the same left and right side at the rear end side of the cable stay 95. An outer cable 80 of the Bowden cable 79 is attached via an attachment mechanism 83 so that the position in the length direction can be adjusted.
By swinging (causing) the operating lever 86 from the storage position Y1 indicated by the solid line to the stand position X1 indicated by the phantom line in FIG. 8, the inner cable 82 is pulled and the stand 49 is changed from the storage position Y to the stand position X. The posture is changed. Therefore, the operation lever 86 is supported in a swingable manner around the pivot 88 at a stand position X1 where the stand 49 is in the stand posture X and a storage position Y1 where the stand 49 is in the storage posture Y.

A stand position locking portion 93a for engaging the operation lever 86 with the stand position X1 is provided on the front side of the guide groove 93, and a storage position locking portion for engaging the operation lever 86 with the storage position Y1 on the rear side of the guide groove 93. 93b is provided.
Lever urging means 97 constituted by a tension coil spring is connected to the front lower part of each corresponding guide plate 92 and the lower halfway part of the operating lever 86. The lever urging means 97 (pulling coil spring) pulls the stand 49 from the storage posture Y side to the stand posture X side against the urging force of the stand urging means 73 (torsion coil spring) via the operation lever 86 and the inner cable 82. When the operating lever 86 is pulled upward or frontward from the driver's seat 6 and the operating lever 86 is engaged with the stand position locking portion 93a of the guide groove 93, the stand 49 is pulled forward and the stand posture. At this time, the urging force of the stand urging means 73 becomes larger than the urging force of the lever urging means 97, and the stand urging means 73 (torsion coil spring) is operated via the inner cable 82. 86 is urged downward or rearward. Further, after pulling the operation lever 86 upward or frontward from the driver's seat 6 side, when the operation lever 86 is swung rearward or downward and engaged with the storage position locking portion 93b, the stand 49 is moved rearward. Pulled into the storage posture Y. At this time, the urging force of the lever urging means 97 becomes larger than the urging force of the stand urging means 73, and the lever urging means 97 urges the operating lever 86 upward or forward. .

The present invention is not limited to the above embodiment, and various design changes can be made.
Further, in the present embodiment, the side drive type rotary tiller is exemplified as the working machine, but a center drive type rotary tiller or other working machines may be used.
According to the said embodiment, when connecting the rotary tiller 11 to the connection apparatus 13, the stand 49 is made into stand attitude | position X, the rotary tiller 11 is made self-supporting, and the upper connection part 40 of the connection apparatus 13 in this state The tractor vehicle body 2 is backed so that the lower cultivator 11 is located below the upper coupling portion 30 on the rotary tiller 11 side, and the lower link 34, the hitch frame 35, etc. When the upper connecting portion 30 is scooped up from below by the upper connecting portion 40, the rotary tiller 11 rotates around the upper connecting portion 30 so as to approach the connecting device 13 (the tractor vehicle body 2). 11, the lower connecting portion 32 engages with the lower engaging portion 41 of the connecting device 13, and the lower connecting portion 32 is retained by the locking member. Is rotatably pivotally connected around the axis in the lateral direction under the connected portion of the switch frame 35, the rotary power tiller 11 is automatically connected to the connecting device 13. At this time, the PTO shaft 3 and the PIC shaft 24 are simultaneously connected by the joint device.

  Then, when the stand 49 is changed from the stand posture X to the storage posture Y, with the rotary tiller 11 lifted as shown in FIG. 1, after pulling the operation lever 86 slightly forward from the driver's seat 6 side, The operating lever 86 may be swung rearward to engage with the storage position locking portion 93b, and the stand 49 is pulled inward in the left-right direction to the storage posture Y. At this time, the urging force of the lever urging means 97 becomes larger than the urging force of the stand urging means 73, and the lever urging means 97 urges the operation lever 86 upward or forward, and the operation lever 86. Is engaged with the storage position locking portion 93b and the stand 49 is held in the storage posture Y.

  When removing the rotary tiller 11 from the coupling device 13, first, the stand 49 is changed from the storage posture Y to the stand posture X. In this case, as shown in FIG. 1, with the rotary tiller lifted up, the operation lever 86 is pushed slightly rearward from the driver's seat 6 side, and then the operation lever 86 is swung forward to stand position locking portion. The stand 49 may be engaged, and the stand 49 is pulled outward in the left-right direction to be in the stand posture X. At this time, the urging force of the stand urging means 73 becomes larger than the urging force of the lever urging means 97, and the stand urging means 73 urges the operation lever 86 downward or rearward, and the operation lever 86. Is engaged with the stand position locking portion 93a, and the stand 49 is held in the stand posture X.

Thereafter, the release lever of the connecting device 13 is pulled down to keep the locking member detached from the lower connecting portion 32. In this state, the lower link 34 and the hitch frame 35 are lowered to rotate the rotary tillage. The machine 11 is removed from the coupling device 13, and the rotary tiller 11 is self-supported by a stand 49.
Accordingly, the operation lever 86 to which the inner cable 82 is connected is operated from above the driver seat 6 of the tractor vehicle body 2 so that the stand 49 of the rotary tiller 11 can be easily placed in the stand posture X and the storage posture Y while being mounted on the tractor vehicle body 2. The posture can be changed between.

10 to 12 show other embodiments, in which a tension coil spring is used in place of the torsion coil spring as the stand biasing means 73, and one end side of the tension coil spring 73 is a locking pin provided in the middle of the stand 49. The other end side of the tension coil spring 73 is connected to a connecting cable 99 connected to the rotating member 70, and the connecting cable 99 protrudes from the front side wall 61 of the fixed bracket 60. The stand 49 is constantly urged in the direction of rotating from the stand posture X to the storage posture Y by the urging force of the stand urging means 73. The other points are the same as those in the above-described embodiment, and have the same effects.

In the embodiment, the connecting device 13 includes the top link 33, the pair of left and right lower links 34, and the hitch frame 35. Instead, the connecting device 13 is connected to the hitch frame 35. You may make it abbreviate | omit and comprise by the three-point link mechanism which has the top link 33 and the pair of left and right lower links 34.
In the above embodiment, the lever urging means 97 is provided in addition to the stand urging means 73 constituted by the torsion coil spring or the torsion coil spring so that the operation lever 86 can be operated with a light force. Instead, the lever urging means 97 may be omitted.

  Moreover, the working machine to be mounted on the tractor body 2 is not limited to the rotary tiller 11, and instead of the rotary tiller 11, a work machine in which a trouser device, a fertilizer, or other working machines are mounted on the tractor body 2. Also, the present invention can be applied.

1 Tractor 2 Tractor body 11 Rotary tiller (work machine)
49 Stand 73 Stand biasing means 82 Inner cable 84 Cable guide 86 Operation lever 88 Axis 97 Lever biasing means X Stand attitude Y Storage position X1 Stand position Y1 Storage position

Claims (5)

A pair of left and right support arms (45) protrudes rearward from a working machine (11) having a rotary tiller (15) mounted on the tractor vehicle body (2) via link means, and the support arms (45). The horizontal connecting rod (47) is connected and fixed between the front end portions of the two, and the stand (49) is attached to the horizontal connecting rod (47) so that the work machine (11) is self- supported around the support shaft (65) in the front-rear direction (X ) And a storage posture (Y) that is rotated upward and stored along the lateral coupling rod (47) so as to be freely changeable in posture.
Stand urging means (73) for urging the stand (49) from the stand posture (X) to the storage posture (Y) is provided, and the stand (49) is changed from the storage posture (Y) to the stand posture (X). A remote control cable (82) is provided to change the attitude of the work implement (11) so that the operation lever (86) to which the cable (82) is connected can be operated from above the tractor body (2). A stand device for a work machine, characterized by being provided on a side. The operating lever (86) houses the stand position (X1) that brings the stand (49) into the stand posture (X) when the cable (82) is pulled, and the stand (49) when the tensile force of the cable (82) is released. It is supported by the storage position (Y1) in the posture (Y) so as to be swingable about the pivot (88), and urges the operation lever (86) from the storage position (Y1) to the stand position (X1). A lever urging means (97) is provided, and when the operating lever (86) is swung to the storage position (Y1), the urging force of the stand urging means (73) is larger than that of the lever urging means (97). The lever urging means (97) is set to have a larger urging force than the stand urging means (73) when the operating lever (86) is swung to the stand posture (X). The feature of claim 1 Work machine of the stand apparatus.   When the posture of the stand (49) is changed, the cable (82) is guided around the center of rotation of the stand (49) so that the circle around the center of rotation of the stand (49) is provided on the base side of the stand (49). The stand device for a working machine according to claim 1 or 2, wherein a cable guide (84) curved in an arc is provided. A pair of the stands (49) are provided on the left and right with respect to the work machine, and the cable (82), the stand urging means (73) and the operation lever (
86) is provided with a pair of left and right, respectively, and the stand device for a working machine according to any one of claims 1 to 3. The said stand biasing means (73) is comprised by the torsion coil spring or the tension coil spring , and the said stand biasing means (73) is arrange | positioned in the front side of the stand (49) , Any one of Claims 1-4 characterized by the above-mentioned. The work machine stand device according to claim 1.

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