JP3562738B2 - Coaxial forward / reverse working machine - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a working machine provided with a spiral rotor.
[0002]
[Prior art]
A spiral rotor is suitable for weeding in an orchard or the like and crushing of topsoil.
There are work machines similar to spiral rotors. For example, (1) Japanese Utility Model Publication No. 1-39126, "Mid-Mount Mower Mounting Mechanism for Tractor" and (2) Japanese Utility Model Publication No. 60-17606, "Tillers Combined with Weeding Machines" 2 ▼ is a weeding rotor.
[0003]
According to FIG. 1 of the publication, the above-mentioned (1) arranges the left mower A, the rear mower C, and the right mower B in the width direction of the tractor, and cuts the grass with a width of A + C + B. Since the rear mower C cannot be arranged under the vehicle body, the rear mower C is towed to the rear of the vehicle body, and the other left and right mowers A and B are arranged on the left and right sides of the vehicle body.
[0004]
According to the above (2), according to FIG. 1 of the publication, a gear box 5 is attached to the end of a long operation tube 1, and rotating shafts 9 and 10 are protruded from the gear box 5 to the left and right. This is a weeding machine in which rotors 11 and 11 are attached to 10.
[0005]
[Problems to be solved by the invention]
In the above (1), since the left mower A, the right mower B, and the rear mower C are each driven, the drive system becomes complicated. For this purpose, a large tractor is required, but it is difficult to work with a large tractor because the trees are standing in the orchard, and a small work vehicle with a small turn is required.
[0006]
The above item (2) is very small and can be used in orchards. However, since the grass cannot be cut in the central gear box 5, it is necessary to make many round trips, and the burden on the operator is extremely large.
[0007]
[Means for Solving the Problems]
In order to reduce the burden on the workers, the inventors of the present invention decided to pull the spiral rotor on a small work vehicle, eliminate the uncut portion of the gearbox, and perform this work because the work vehicle is small. The work machine that can prevent the reaction force of the spiral rotor from being applied to the vehicle has been completed.
[0008]
Specifically, claim 1 extends the hollow first tilling shaft from the work implement transmission case, and extends the second tilling shaft from the work implement transmission case by penetrating the inside of the first cultivation shaft. In a coaxial forward / reverse working machine in which a first tilling shaft near the transmission case is rotated forward and a tilling claw is mounted on this shaft, a second tilling shaft far from the transmission case is reversely rotated and a spiral rotor is mounted on this shaft .
The turning outer diameter of the tilling claw is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from behind.
[0009]
Since the tilling claws are arranged near the transmission case, the untiled portion below the transmission case can be eliminated, and the tilling claws are rotated forward so that the grass and soil cut can be smoothly discharged to the rear. It is possible to suppress the stacking phenomenon that occurs on the remaining soil.
Since the tilling claw and the spiral rotor are reversed, the work reaction force is offset, the load on the work vehicle is reduced, and the weight and size of the working vehicle can be reduced.
In addition, weeding can be performed at a certain depth, the appearance after weeding is improved, and the finish of weeding is also improved.
Furthermore, since the tilling claw and the spiral rotor are wrapped, there is an advantage that there is no remaining mowing between the claw and the rotor.
[0010]
Claim 2 extends the hollow first tilling shaft from the work implement transmission case, extends the second tilling shaft from the work implement transmission case through the inside of the first cultivation shaft, and moves the transmission case closer to the transmission case. In a coaxial forward / reverse working machine that attaches a spiral rotor to a first tillage shaft, attaches a tillage claw to a second tillage shaft far from a transmission case, and rotates the first and second tillage shafts in opposite directions ,
The turning outer diameter of the tilling claw is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from behind.
[0011]
Since the spiral rotor and the tilling claws are reversed, the work reaction force is canceled, the load on the work vehicle is reduced, and the weight and size of the working vehicle can be reduced.
Since the both sides of the mowing width are cut with the tilling claws, the mowing width becomes clear, which is convenient when the mowing is performed by reciprocating in a large field, and the working effect is improved.
Furthermore, since the tilling claw and the spiral rotor are wrapped, there is an advantage that there is no remaining mowing between the claw and the rotor.
[0014]
Claim 3 is characterized in that the rotation speeds of the first cultivation shaft and the second cultivation shaft are substantially the same.
[0015]
Since the forward rotation speed and the reverse rotation speed are substantially the same, the forward force and the backward force can be favorably canceled.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals.
FIG. 1 is a side view of a work vehicle according to the present invention. The work vehicle 1 includes a small-diameter front wheel 3 and a large-diameter rear wheel 4 in front and rear of a body frame 2, a front weight 5 at a front end, and a front to rear direction. A work machine 20 having a handle post 6, a steering handle 7, an occupant seat 8, and a prime mover 9 (having a cylinder head 11, a muffler 12, and a fuel tank 13 at the top) and a spiral rotor at the rear is detachable. It is a relatively small and lightweight vehicle that is suspended from a vehicle.
[0017]
The working machine 20 is in a state of being raised by a hydraulic cylinder (not shown), receives a driving force from the prime mover 9 via a transmission means, and appropriately rotates the spiral rotor 90 forward and backward, which will be described in detail later.
[0018]
Reference numeral 40 denotes a work machine transmission device, which is a device for reducing the driving force of the prime mover and transmitting it to the tilling shafts 46 and 47, and 24 is a rotary side cover, which is a rotary cover 25 that covers the upper half of the spiral rotor 90. A member 26 for closing the side, 26 is a side rear cover, which is attached to the rear part of the rotary side cover 24 so as to be adjustable in position, and 27 is a curved elongated hole for that purpose.
Reference numeral 28 denotes a resistance bar, which is provided with a tail sled (or a depth adjusting shoe) 29 at the tip (lower end) and adjusts the tilling depth.
[0019]
FIG. 2 is a plan view of the working vehicle according to the present invention (the working machine 20 is simply represented and will be described in detail later). The front weight 5, the operation pedal 16, the steering handle 7, This shows that the occupant seat 8, the prime mover 9, the chain case 31 as the transmission means, the work implement transmission device 40, and the work implement 20 are arranged.
The chain case 31 is a sealed case in which the driving sprocket 32, the driven sprocket 33, and the chain 34 are collectively stored, and the work machine transmission device 40 is a sealed case in which gears, sprockets, and chains (not shown) are collectively stored. Since these are sealed structures, there is no fear that rainwater or mud will enter inside.
Reference numeral 36 denotes a shift lever, reference numeral 37 denotes a tilling claw rotation / stop lever, reference numeral 38 denotes an air cleaner, and reference numeral 39 denotes a starter grip.
[0020]
FIG. 3 is a longitudinal sectional view of the work implement transmission case according to the present invention.
The work implement transmission device 40 includes a work implement transmission case 41 formed by combining left and right case halves 41L and 41R, an input shaft 42, a first intermediate shaft 43, and a second intermediate It comprises a shaft 44 and an output shaft 45. The output shaft 45 has a first tilling shaft 46 and first tilling shafts 47, 47 arranged coaxially. Reference numerals 48 and 49 denote bolts and nuts, which are components for connecting the left and right case halves 41L and 41R.
[0021]
First, the operation of the work machine transmission device 40 will be described. When the input shaft 42 is driven by the prime mover of the work vehicle, the input shaft 42 → the input shaft sprocket 51 → the chain 52 → the first intermediate sprocket 53 → the first intermediate gear. The torque is transmitted in the order of 54 → second intermediate gear 55 → second intermediate sprocket 56 → chain 57 → reverse shaft sprocket 58 → first tilling shaft 46, and the first tilling shaft 46 is rotated in the reverse direction.
Also, the input shaft 42 → the input shaft sprocket 51 → the chain 52 → the first intermediate sprocket 53 → the first intermediate gear 54 → the second intermediate gear 55 → the third gears 61L, 61R → the fourth gears 62L, 62R → the first cultivating shaft. Torque is transmitted in the order of 47, 47, and the first tilling shafts 47, 47 are rotated forward.
[0022]
The left case half 41L is formed by press-welding an input shaft cylinder 65 and an output shaft cylinder 66 to a case half base 64L formed by press-forming a steel plate, and forming a first intermediate shaft bearing seat 67 and a second intermediate shaft. A bearing seat 68 is formed, and a bearing holding plate 69 for receiving a bearing outer peripheral surface is provided inside. The bearing holding plate 69 has a hole formed in a flat plate thicker than the case half base 64L for fitting the bearing 71 of the first intermediate shaft 43 and a hole for fitting the bearing 72 of the second intermediate shaft 44. , And a hole through which the output shaft cylinder 66 passes.
73 is a bearing for receiving the input shaft 42, 74 is a bearing for receiving the first tilling shaft 47, and 75 is a needle bearing for receiving the first tilling shaft 46 to the first tilling shaft 47.
Note that the bearing seats 67 and 68 are portions that receive one side surface of the outer ring of the bearings 71 and 72, and the bulging portions 76 and 77 escape outward to allow the inner rings of the bearings 67 and 68 to rotate freely. Part.
[0023]
Since the right case half 41R and the case half base 64R have the same structure as the left case half 41L and the case half base 64L, description thereof will be omitted.
[0024]
FIG. 4 is a view of the left case half base according to the present invention (corresponding to a view in which a sprocket, a gear, a bearing, and a bearing holding plate are removed from a view taken along arrow 4-4 in FIG. 3). In the drawing, Fr indicates “front” (forward side).
In the left case half base 64L, the arrangement of the flange 78 and the bolt holes 79 and 80 is symmetrical with respect to a line L1 passing through the center P1 of the input shaft and the center P2 of the output shaft, and the center of the first intermediate shaft. When the line passing through P3 and the center P4 of the preliminary bearing seat 67S of the first intermediate shaft provided near the second intermediate shaft is defined as L2, the line L2 is set so as to be orthogonal to the line L1.
[0025]
That is, a bearing case 68S for the second intermediate shaft for the right case half body is preliminarily formed near the bearing seat 67 for the first intermediate shaft, and a right case half 68A near the bearing seat 68 for the second intermediate shaft. It is characterized in that the bearing seat 67S of the first intermediate shaft for the body is preliminarily formed.
As a result, the gourd-shaped convex portion 81 swelling to the back of the drawing is formed by the bearing seat 67 of the first intermediate shaft and the spare bearing seat 68S, and similarly, the bearing seat 68 and the spare bearing seat 67S of the second intermediate shaft are formed. A gourd-shaped convex portion 82 bulging to the back of the drawing is formed, and these gourd-shaped convex portions 81 and 82 are formed in a “reverse C” shape. The “reverse C” -shaped convex portions 81 and 82 are symmetric with respect to the line L1.
As is clear from FIG. 3, the formation of the bulging portions 76 and 77 increases the section modulus of the case half base 64L and increases the strength and rigidity.
[0026]
FIG. 5 is a view of the right case half base according to the present invention (corresponding to a view in which a chain, a sprocket, a gear, a bearing, and a bearing holding plate are removed from a view taken along arrow 5-5 in FIG. 3). In the drawing, Fr indicates “front” (forward side).
In the right case half base 64R, the arrangement of the flange 78 and the bolt holes 79 and 80 is symmetric with respect to a line L1 passing through the center P1 of the input shaft and the center P2 of the output shaft, and the center of the first intermediate shaft is provided. When the line passing through P3 and the center P4 of the preliminary bearing seat 67S of the first intermediate shaft provided near the second intermediate shaft is L3, the line L3 is set so as to be orthogonal to the line L1.
[0027]
That is, a bearing case 68S for the second intermediate shaft for the right case half body is preliminarily formed near the bearing seat 67 for the first intermediate shaft, and a right case half 68A near the bearing seat 68 for the second intermediate shaft. It is characterized in that the bearing seat 67S of the first intermediate shaft for the body is preliminarily formed.
As a result, the gourd-shaped convex portion 81 swelling to the back of the drawing is formed by the bearing seat 67 of the first intermediate shaft and the spare bearing seat 68S, and similarly, the bearing seat 68 and the spare bearing seat 67S of the second intermediate shaft are formed. A gourd-shaped convex portion 82 bulging to the back of the drawing is formed, and these gourd-shaped convex portions 81 and 82 are formed in a “reverse C” shape.
[0028]
To summarize the operation of the work implement transmission device of the present invention described above, if the bearing seat 67 of the first intermediate shaft, the bearing seat 68 of the second intermediate shaft, and the spare bearing seats 67S, 68S have the same shape, FIG. The left case half base 64L of 4 and the right case half base 64R of FIG. 5 have the same shape.
Then, the bearing holding plate 69 described in FIG.
As a result, not only the case half bases 64L and 64R but also the left and right case halves 41R and 41L can be completely identical, and as a result, the left and right case halves 41R and 41L can be manufactured with a common drawing. can do. When manufacturing by casting, there is an advantage that only one mold is required, and when manufacturing by pressing, there is an advantage that only one press die is required.
[0029]
FIG. 6 is a view showing a first embodiment of the working machine according to the present invention, in which a hollow first cultivating shaft 47 extends from a working machine transmission case 41 and penetrates through the inside of the first cultivating shaft 47. The second tilling shaft 46 extends from the transmission case 41, the claw-shaped tilling claws 21 serving as the first cultivating shaft near the transmission case are attached, and the spiral rotor 90 is attached to the second tilling shaft far from the transmission case. And
The tilling nail 21 may be a normal nail, a petal nail, or the like.
[0030]
In the spiral rotor 90, cone-shaped disks 92, 92 are attached to a hollow shaft 91, rings 93, 93 are attached to the tips of the disks 92, 92, and a ribbon-shaped spiral cutter 94 (for convenience, attached to the rings 93, 93). (Only one sheet is shown). The spiral rotor 90 is fixed to the second tilling shaft 46 with long bolts 95.
[0031]
The tilling claw 21 is attached to the first tilling shaft 47 via an attachment 85 including a boss 86 and a disk 87. 88 is a bolt for attaching the tilling claw 21 to the disk 87, and 89 is a lock bolt for fixing the attachment 85 to the first tilling shaft 47.
As described above, the first tilling shaft 47 and the second tilling shaft 46 are forcibly rotated in opposite directions.
[0032]
The operation of the working machine described above (first embodiment) will now be described.
FIG. 7 is an explanatory view of the operation of the working machine (first embodiment) according to the present invention. The first cultivating shaft 47 is rotated forward and the second cultivating shaft 46 is reversed by the operation of the working machine transmission case 41. Therefore, the tilling claw 21 attached to the first tilling shaft 47 near the transmission case 41 is rotated forward, and the spiral rotor 90 attached to the second tilling shaft 46 far from the transmission case 41 is reversed.
[0033]
First, if a tanning claw is adopted as the cultivating claw 21, the lower part of the transmission case 41 can be scratched by a bent portion of the tip of the tanning claw, and weeding and crushing of the topsoil in this portion can be performed. The crushing action of the topsoil cuts the grass roots and separates the cultivated soil attached to the grass roots back to the cultivated land.
If the tilling claw 21 is reversed, the cut grass and soil fly forward and accumulate, causing the bottom of the transmission case 41 (this is referred to as a “stack” phenomenon). Since the tilling claw 21 is rotated forward, the cut grass and soil mainly fly backward, and such a problem does not occur.
[0034]
Furthermore, the reaction force generated in the work machine 20 is canceled by reversing the tilling claw 21 and the spiral rotor 90 with each other. That is, the forward rotation tilling claws 21 try to advance the work implement 20 and the reverse rotation rotor 90 attempts to retract the work implement, so that the forces are offset. As a result, the burden of towing the work vehicle 1 is reduced, and the work vehicle 1 can be reduced in weight and size.
Preferably, if the normal rotation and the reverse rotation are set to the same rotation speed, a larger canceling action can be exhibited.
Moreover, since the tilling claw 21 and the spiral rotor 90 are wrapped, there is also an advantage that there is no remaining mowing between the claw and the rotor.
[0035]
FIG. 8 is a view showing a second embodiment of the working machine according to the present invention, in which a hollow first cultivating shaft 47 is extended from a working machine transmission case 41 and the inside of the first cultivating shaft 47 is penetrated. The second tilling shaft 46 extends from the transmission case 41, the spiral rotor 90 is mounted on the first cultivating shaft 47 near the transmission case, the tilling claws 21 are mounted on the second cultivating shaft 46 far from the transmission case, and the first cultivating shaft 47 is mounted. , And the second tilling shaft 46 is rotated forward.
As a rule, the turning outer diameter of the tilling claw 21 is made larger than the outer diameter of the spiral rotor 90.
[0036]
By reversing the spiral rotor 90 and the tilling claw 21 from each other, the reaction force generated in the working machine is canceled. That is, the forward rotation tilling claw 21 attempts to advance the work implement 20, and the reverse rotation spiral rotor 90 attempts to retract the work implement 20, so that the forces are offset. As a result, the burden of towing the work vehicle 1 is reduced, and the work vehicle 1 can be reduced in weight and size.
Preferably, if the normal rotation and the reverse rotation are set to the same rotation speed, a larger canceling action can be exhibited.
[0037]
And since the both sides of the mowing width are cut with the tilling claws 21 having a larger diameter than the spiral rotor 90, the mowing width becomes clear, which is convenient when performing mowing by reciprocating in a large field, and the working effect is improved. Needless to say, the tilling claws 21 also exert the effect of crushing the topsoil.
[0038]
FIG. 9 is a view showing a third embodiment of the working machine according to the present invention, in which a hollow first tilling shaft 47 is extended from the working machine transmission case 41 and the inside of the first tilling shaft 47 is penetrated. The second tilling shaft 46 extends from the transmission case 41, the spiral rotor 90 is mounted on the first cultivating shaft 47 near the transmission case, the tilling claws 21 are mounted on the second cultivating shaft 46 far from the transmission case, and the first cultivating shaft 47 is mounted. , And the second tilling shaft 46 is reversed.
As a rule, the turning outer diameter of the tilling claw 21 is made larger than the outer diameter of the spiral rotor 90.
[0039]
By reversing the spiral rotor 90 and the tilling claw 21 from each other, the reaction force generated in the working machine is canceled. That is, the forward rotation tilling claw 21 attempts to advance the work implement 20, and the reverse rotation spiral rotor 90 attempts to retract the work implement 20, so that the forces are offset. As a result, the burden of towing the work vehicle 1 is reduced, and the work vehicle 1 can be reduced in weight and size.
Preferably, if the normal rotation and the reverse rotation are set to the same rotation speed, a larger canceling action can be exhibited.
[0040]
And since the both sides of the mowing width are cut with the tilling claws 21 having a larger diameter than the spiral rotor 90, the mowing width becomes clear, which is convenient when performing mowing by reciprocating in a large field, and the working effect is improved. Needless to say, the tilling claws 21 also exert the effect of crushing the topsoil.
Furthermore, since the spiral rotor 90 on the mission case 41 side is rotated forward, there is no fear that the cut grass or soil will fly forward, and the bottoming of the mission case 41 can be suppressed.
[0041]
FIG. 10 is a reference view of the working machine of the present invention, in which a hollow first tilling shaft 47 is extended from the working machine transmission case 41 and the inside of the first cultivating shaft 47 is penetrated. , The spiral rotor 90A is attached to the first cultivation shaft 47 near the transmission case, the spiral rotor 90B is also attached to the second cultivation shaft 46 far from the transmission case, and the first cultivation shaft 47 (spiral) The rotor 90A) is reversed, and the second tilling shaft 46 (spiral rotor 90B) is rotated forward.
[0042]
The reversal of the spiral rotor 90A and the spiral rotor 90B cancels the reaction force generated in the work implement. That is, the forward rotating rotor 90B tries to move the work implement 20 forward, and the reverse spiral rotor 90A tries to move the work implement 20 backward, so that the forces are offset. As a result, the burden of towing the work vehicle 1 is reduced, and the work vehicle 1 can be reduced in weight and size.
Preferably, if the normal rotation and the reverse rotation are set to the same rotation speed, a larger canceling action can be exhibited.
[0043]
FIG. 11 is a reference view of the working machine of the present invention, in which a hollow first tilling shaft 47 is extended from the working machine transmission case 41 and the inside of the first cultivating shaft 47 is penetrated. , The spiral rotor 90A is attached to the first cultivation shaft 47 near the transmission case, the spiral rotor 90B is also attached to the second cultivation shaft 46 far from the transmission case, and the first cultivation shaft 47 (spiral) The rotor 90A is rotated forward and the second tilling shaft 46 (spiral rotor 90B) is rotated reversely.
[0044]
The reversal of the spiral rotor 90A and the spiral rotor 90B cancels the reaction force generated in the work implement. In other words, the forward spiral rotor 90A attempts to move the work implement 20 forward, and the reverse spiral rotor 90B attempts to move the work implement 20 backward, so that the forces are offset. As a result, the burden of towing the work vehicle 1 is reduced, and the work vehicle 1 can be reduced in weight and size.
Preferably, if the normal rotation and the reverse rotation are set to the same rotation speed, a larger canceling action can be exhibited.
Furthermore, since the spiral rotor 90A on the mission case 41 side is rotated forward, there is no fear that cut grass and soil will fly forward, and the bottoming of the transmission case 41 can be suppressed.
[0045]
Incidentally, claim 1 of the present invention corresponds to the first embodiment, and claim 2 corresponds to the second and third embodiments.
Further, the tillage nail 21 is preferably a tan nail, but may be a normal nail or a petal nail.
[0046]
【The invention's effect】
The present invention has the following effects by the above configuration.
Claim 1 extends the hollow first tilling shaft from the work implement transmission case, and extends the second tilling shaft from the work implement transmission case by penetrating the inside of the first cultivation shaft. The first tilling shaft is rotated forward, the tilling claw is attached to this shaft, the second tilling shaft far from the transmission case is rotated in the reverse direction, and the spiral rotator is attached to this shaft. The outer diameter is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from behind.
[0047]
Since the tilling claws are arranged near the transmission case, the untiled portion below the transmission case can be eliminated, and the tilling claws are rotated forward so that the grass and soil cut can be smoothly discharged to the rear. It is possible to suppress the stacking phenomenon that occurs on the remaining soil.
Since the tilling claw and the spiral rotor are reversed, the work reaction force is offset, the load on the work vehicle is reduced, and the weight and size of the working vehicle can be reduced. In addition, weeding can be performed at a certain depth, the appearance after weeding is improved, and the finish of weeding is also improved.
Furthermore, since the tilling claw and the spiral rotor are wrapped, there is an advantage that there is no remaining mowing between the claw and the rotor.
[0048]
Claim 2 extends the hollow first tilling shaft from the work implement transmission case, extends the second tilling shaft from the work implement transmission case through the inside of the first cultivation shaft, and moves the transmission case closer to the transmission case. In a coaxial forward / reverse working machine that attaches a spiral rotor to a first tillage shaft, attaches a tillage claw to a second tillage shaft far from a transmission case, and rotates the first and second tillage shafts in opposite directions ,
The turning outer diameter of the tilling claw is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from behind.
[0049]
Since the spiral rotor and the tilling claws are reversed, the work reaction force is canceled, the load on the work vehicle is reduced, and the weight and size of the working vehicle can be reduced.
Since the both sides of the mowing width are cut with the tilling claws, the mowing width becomes clear, which is convenient when the mowing is performed by reciprocating in a large field, and the working effect is improved.
Furthermore, since the tilling claw and the spiral rotor are wrapped, there is an advantage that there is no remaining mowing between the claw and the rotor.
[0052]
Claim 3 is characterized in that the rotation speeds of the first cultivation shaft and the second cultivation shaft are substantially the same.
[0053]
Since the forward rotation speed and the reverse rotation speed are substantially the same, the forward force and the backward force can be favorably canceled.
[Brief description of the drawings]
1 is a side view of a work vehicle according to the present invention; FIG. 2 is a plan view of a work vehicle according to the present invention; FIG. 3 is a longitudinal sectional view of a work machine transmission case according to the present invention; FIG. 5 is a view of the right case half base according to the present invention. FIG. 6 is a view of the first embodiment of the working machine of the present invention. FIG. 7 is a working machine of the present invention ( FIG. 8 is a diagram of a second embodiment of the working machine of the present invention. FIG. 9 is a diagram of a third embodiment of the working machine of the present invention. FIG. 10 is a reference of the working machine of the present invention. FIG . 11: Reference diagram of the working machine of the present invention [Description of reference numerals]
DESCRIPTION OF SYMBOLS 1 ... Work vehicle, 20 ... Work machine, 21 ... Tilling claw, 41 ... Work machine transmission case (mission case), 46 ... Second cultivation shaft, 47 ... First cultivation shaft, 90, 90A, 90B ... Spiral rotor.

Claims (3)

While extending the hollow first tilling shaft from the work machine transmission case, penetrating the inside of the first cultivation shaft and extending the second cultivation shaft from the work machine transmission case, the first cultivation shaft close to the mission case is moved. In a coaxial forward / reverse working machine that rotates forward and attaches a tilling claw to this shaft, reversely rotates a second tilling shaft far from the transmission case and attaches a spiral rotor to this shaft ,
The turning outer diameter of the tilling claw is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from the rear. Work machine. A hollow first tilling shaft is extended from the work machine transmission case, and a second cultivation shaft is extended from the work machine transmission case through the inside of the first cultivation shaft. A coaxial forward / reverse working machine that attaches a spiral rotor, attaches a tilling claw to a second tilling shaft far from the transmission case, and rotates the first tilling shaft and the second tilling shaft in opposite directions .
The turning outer diameter of the tilling claw is made larger than the outer diameter of the spiral rotor, and the tip of the tilling claw is wrapped around the spiral rotor when the working machine is viewed from the rear. Work machine. The first cultivating shaft coaxial forward and reverse working machine according to claim 1 or claim 2 Symbol mounting, characterized in that it has substantially the same rotational speed of the second cultivating shaft.

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