JP4178710B2 - Front rotary tiller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a front rotary tiller. The present invention relates to a work machine mounting apparatus for attaching another work machine to the rear part of a front rotary tiller, and at the same time, plowing work on the front part of the machine body and other towing work such as ridges and grooving at the rear part of the machine body. It is something to try.
[0002]
[Prior art]
A transmission case that is long in the front-rear direction is configured, the engine above the middle part in the front-rear direction and the main shaft that transmits power from the engine are arranged in the middle in the front-rear direction, and a rotary tillage shaft is arranged at the front end of the transmission case part. There is a conventional front rotary cultivator in which an axle and a steering handle are arranged at the rear end of a case part, and a towing work machine is attached below the handle. In this conventional configuration, the traction work machine is mounted so as to be movable up and down through two parallel links in a side view.
[0003]
[Problems to be solved by the invention]
In such a conventional front rotary cultivator, the towing work machine located below the steering handle moves up and down in parallel while maintaining a side view posture with a plurality of links. It was difficult to keep the depth of entry constant, and it was easy to change the depth of the soil due to the resistance of the soil. In addition, since it rises in parallel, the lower part of the rear end of the towing work machine tends to be in a low position even when it is lifted, and it is easy to cause a problem that the knees and shins of the pilot walking while holding the steering handle.
[0004]
[Means for solving problems]
The present invention is intended to eliminate the above-mentioned drawbacks of the conventional apparatus, and has taken the following technical means. That is, the front end portion tilling shaft in the vicinity of the wheel shaft in the vicinity of the rear end portion (1) (2) respectively the left-right direction projecting long transmission case in the longitudinal direction (3), the wheel axis from the longitudinal direction intermediate portion (2) equipped with an engine (4) upwardly extending between, the driving force of the engine (4) and transmitted to the transmission case (3) and configured for rotating the two shafts, a rear portion of the transmission case (3) top A support frame (5 ) provided with a guide arm (9) that moves downward about its axis (6 ) by its own weight or spring force, and a pulling bar (8) that protrudes backward about its lower axis (7) so as to be swingable in the vertical direction. ) , And a handle (10) projecting rearward and upward from between the engine (4) and the support frame (5 ) is projected, and a pin shaft (11) is provided at the front-rear intermediate portion of the tow bar (8), The guide arm (9) has an up-down direction locking portion (12) and an upper portion from the side closer to the upper shaft (6). When the concave groove of the restricting portion (13) is provided and the pin shaft (11) of the pulling bar (8) is operated to engage with the concave groove of the vertical locking portion (12), it is attached to the rear portion of the pulling bar (8). When the lifting / lowering posture of the traction work machine is in the lifting and fixing posture (A) and the pin shaft (11) of the traction bar (8) is operated to engage with the concave groove of the upper restricting portion (13), the rear portion of the traction bar (8) The front rotary tiller is characterized in that the lifting posture of the towing work machine attached to the vehicle is a towable swinging posture (B) .
[ 0005 ]
[ 0006 ]
[0007]
[Action and effect of the invention]
When driving and rotating the tiller shaft 1 located at the front of the front rotary tiller, the wheels are driven and rotated in the forward direction to drive the field, and the tiller shaft 1 is submerged in the soil. The cultivator advances while excavating and crushing the soil. On the support frame 5 attached to the rear part of the transmission case 3, a traction bar 8 for attaching a traction work machine is attached so as to be swingable in the vertical direction around the lower shaft. If it is attached to the soil, the soil at the center in the left-right direction of the excavated soil after tillage is divided into right and left by the grooving blade body and can travel while making a groove at the center rear part of the traveling machine body. At this time, since the recessed groove edge wall portion of the upper restricting portion 13 of the guide arm 9 faces the pin shaft 11 of the tow bar 8, the raising of the tow bar 8 beyond a predetermined amount is restricted. When the operator depresses the handle 10 strongly, the support frame 5 moves down around the wheel shaft 2 and the guide arm 9 and the like also move down. Therefore, the pin shaft 11 is pressed by the upper restricting portion 13 and the groove cutting blade body is moved. It can also be pressed in the direction of deepening.
[0008]
When the grooving operation is finished and the vehicle is turned at the end of the field or travels on the road, the handle 10 is pushed down a little while the guide arm 9 is lifted up against the load direction, and then the guide arm 9 When the handle 10 is further lowered while stopping the lifting and moving downward in the load direction, the concave groove of the vertical locking portion 12 of the guide arm 9 automatically engages with the pin shaft 11 of the tow bar 8. When the handle 10 is returned upward in this engaged state, the towing work machine is detached from the soil, the cultivating unit 1 in front of the machine body is removed from the soil, and a turning operation and traveling on the road can be performed.
[0009]
First aspect of the present invention, the configuration described above, Luke can do the turning operation and road as a fixed posture A lifting a lifting posture of towing the working machine attached to the tow bar 8 rear grooving as traction swingable posture B The posture can be easily switched so as to perform a towing operation such as staking and standing.
[0010]
Further, when performing a traction operation such as grooving or standing up as the traction swingable posture B, the steering handle 10 is held at a predetermined depth while preventing the traction bar 8 from being lifted more than a predetermined level. By pushing down, the pin shaft 11 of the tow bar 8 can be pushed down by the upper restricting portion 13 of the guide arm 9, and the depth of entry of the towing machine into the soil can be made deeper than the predetermined depth. At this time, with the guide arm 9 lifted up against the load direction, the handle 10 is pushed down a little, and then the guide arm 9 is lifted and the guide arm 9 is moved down in the load direction to further lower the handle 10. Then, the groove of the vertical locking portion 12 which is a concave groove on the upper portion of the guide arm 9 is automatically engaged with the pin shaft 11 of the pulling bar 8, and the handle 10 is returned upward in this engaged state. Then, the towing work machine is detached upward from the soil, and the cultivating unit 1 in front of the machine body is in a work machine lifting and fixing posture, which is a posture that has been removed from the soil, so that the turning operation and traveling on the road can be easily performed.
[ 0011 ]
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described. The form of this embodiment will be described with reference to FIGS. FIG. 1 is an enlarged side view of the main part, FIG. 2 is a plan view of the main part, FIG. 3 is an overall side view during work where the tractor is attached to the rear part of the machine, and FIG. FIG. 5 is an overall plan view of the whole machine when the machine is lifted and fixed when not working.
[0013]
This embodiment relates to the front rotary cultivator 15. The engine 4 is disposed in the upper part between the front and rear direction intermediate part of the transmission case 3 and the rear part, and the driving force of the engine 4 is attached to the side of the crankshaft. The power is transmitted through a drive pulley 17, a V belt 18, and a driven pulley 19 to a main shaft 16 provided at an intermediate portion in the front-rear direction of the transmission case 3. The driving force transmitted to the main shaft 16 is transmitted to the left and right tillage shafts 1, 1 projecting in the left-right direction at the front end of the transmission case 3 and the wheel shafts 2, 2 projecting left and right at the rear end of the transmission case 3.
[0014]
The transmission case 3 is arranged substantially horizontally in the front-rear direction, and a plurality of tilling claws 20, 20. . Is attached in the radial direction, and the tiller shaft 1 is driven to rotate and pushed into the soil, so that the soil on the field surface is excavated and crushed by the width of the tiller shafts 1 and 1 in one advance. This excavated crushed state is shown in FIG. The upper half of the tilling shaft 1 and the tilling claws 20 are covered with a tilling cover 21, and the tilling cover 21 is attached to the transmission case 3 (not shown). In addition, a gauge ring 22 is disposed in front of the center of the tillage cover 21, and the tilling depth of the tilling shaft 1 can be adjusted by adjusting the vertical height of the gauge ring 22. That is, when the gauge wheel 22 is lowered, the lowering of the tillage shaft 1 is quickly controlled at the bottom of the wheel, so that the plowing depth becomes shallow, and when the gauge wheel 22 is raised, the bottom of the wheel can be lowered until it contacts the soil surface. Except when it is hard and the tilling claw 20 is not pierced, the tilling depth becomes deep.
[0015]
When soil with a predetermined width is excavated and crushed by the tilling claws 20, the soil in that portion becomes soft. Therefore, the drive wheels 23 attached to the wheel shaft 2 with a tread narrower than the predetermined width are left and right wheels as shown in FIG. Travel while co-soiling. Thus, the front rotary cultivator 15 attempts to stabilize the work by elongating the transmission case 3 in the front-rear direction and mounting the engine 4 at a lower position on the rear half thereof to lower the center of gravity of the body. .
[0016]
The left and right transmission case halves are joined to the left and right flanges with bolts and nuts to form a transmission case 3 that is long in the front-rear direction to form a main frame. In the left and right transmission case halves of this transmission case 3, The flange portion on the upper side of the front / rear intermediate portion is bent horizontally horizontally on both left and right sides to form a flat engine mounting portion, and this engine mounting portion is arranged in the vicinity of the upper side of the main shaft 16, and the engine mounting portion is engine-mounted. 4 is installed.
[0017]
A drive belt 17 attached to the driving shaft of the engine 4 and a driven pulley 19 attached to the main shaft 16 are wound around a V-belt 18 as a transmission belt so as to conduct power. The main clutch is configured such that power is interrupted by tension or relaxation by a clutch.
[0018]
A transmission is provided between the wheel shaft 2 and the main shaft 2 at the rear of the transmission case 3, and the shift lever 24 is operated to allow the drive wheel 23 to move forward or backward at a required speed. In addition, left and right side clutches are provided on the wheel shaft 2, respectively, so as to make turning easier by turning off the driving force inward of turning when turning left and right.
[0019]
A support frame 5, which is a main part of the present invention, is attached to the rear part of the transmission case 3. As shown in the enlarged views of FIGS. 1 and 2, the support frame 5 includes left and right frame plates 25, 25, left and right collars 26, 26 integrally welded on the front and upper sides, and an upper pipe 27 welded on the rear upper and lower sides. It consists of a lower pipe 28. Then, the gap between the left and right collars 26, 26 at the front part of the support frame 5 is fastened with bolts 30, 30 so as to sandwich the flange 29, which is the mating surface of the transmission case 3, and integrated with the rear part of the transmission case 3. Attached. The left and right rear ends of the left and right frame plates 25, 25 are integrally welded to the left and right by the upper pipe 27 and the lower pipe 28 as described above, and the upper shaft 6 such as a pin shaft attached in the upper and lower pipes. Via the lower shaft 7, the guide arm 9 is attached to the upper shaft and the pulling bar 8 is attached to the lower shaft.
[0020]
Also, left and right hollow struts 38, 38 that project obliquely upward are provided on the left and right sides of the upper surface of the transmission case 3 between the engine 4 and the support frame 5, and the lower end of the steering handle 10 is viewed from the left and right. It is pinched and fastened with bolts. As shown in the plan view, the steering handle 10 has a looped horizontal bar 10a for easy gripping in the left-right direction, and the mounting base end is inexpensive as a single rod-shaped pipe 10b. This makes it easy to attach to the hollow support 38.
[0021]
A pin shaft 11 that also serves as a reinforcement protrudes laterally at a middle portion in the front-rear direction of a pair of left and right traction bars 8 that protrudes rearward with the lower shaft 7 of the support frame 5 as a pivot axis and is viewed from the side in a plan view. The guide arm 9 that moves downward by its own weight or spring force with the upper shaft 6 as an axis is provided with concave grooves in the vertical locking portion 12 and the upper restricting portion 13 from the side closer to the upper shaft 6. Yes. In addition, an operation lever 14 that protrudes downward on the steering handle 10 side is integrally attached to a lower end portion that is a protruding tip of the guide arm 9.
[0022]
As shown in FIG. 4, when the vertical locking portion 12 is engaged with the pin shaft 11 of the traction bar 8, the traction bar 8 is fixed in the vertical direction at the lifting position. Although the details will be described later, this position is a lifting and fixing posture A. FIG. 3 is an overall side view of the pulling and swinging posture B state in which the engagement is released. In this traction swingable posture B, as shown in FIG. 1, the traction work is attached to the rear portion of the traction bar 8 with the concave groove of the upper restricting portion 13 of the guide arm 9 facing the pin shaft 11 of the traction bar 8. The upward movement of the setter 31 which is a machine is regulated more than a predetermined amount. In the vicinity of the concave groove of the upper restricting portion 13, the pin shaft 11 escapes downward, and above the upper restricting portion 13 of the guide arm 9, the pin shaft 11 is movable up and down, and the upper shaft 6 is the axis. In order to prevent the lower end of the guide arm 9 moving downward due to its own weight or spring force from being greatly disengaged in the forward direction, a vertical slide end edge 32 is provided at the lower part of the guide arm 9 so It guides the movement.
[0023]
At the rear end portion of the tow bar 8, a holder 33 having a vertical hole is provided, and a stay 34 of the erecting device 31 is inserted into the square hole in the vertical direction. 35 is attached so that the vertical position can be adjusted. The vertical stand 31 is a device that divides the soil into left and right to create a groove in the soil by a center blade portion 36 having a tip V-shaped in both plan view and side view by moving forward in the soil excavated by tillage. It is. When the grip 37 is turned, the suction angle of the central blade portion 36 can be changed around the fulcrum 38, and the depth of the central blade portion 36 that can stably enter the soil can be adjusted. Reference numeral 39 denotes an adjustment handle, which can be rotated to change the vertical height of the tail wheel 40, thereby adjusting the depth at which the erecter 31 can stably enter the soil.
[0024]
As described above, in the traction swingable posture B shown in the overall side view of FIG. 3, the hard soil H on the surface of the farm field is set to the tilled soil C obtained by pulverizing the soil mass while excavating the predetermined width. Next, the drive wheel 23 advances while passing through the cultivated soil C. And, as shown in FIG. 6, the tilling soil C is left and right as shown in FIG. 6, using a vertical stand 31 attached to the rear part of one pulling bar 8 provided on the support frame 5 attached to the rear part of the transmission case 3. Divide and drive.
[0025]
At this time, the upper restricting portion 13 of the guide arm 9 and the vertical slide end edge 32 allow a certain amount of vertical movement of the pin shaft 11 of the tow bar 8, while exceeding the predetermined amount after contacting the upper restricting portion 13 and the pin shaft 11. The upswing is regulated. When the driver pushes down on the steering handle 10 in this state, the upper restricting portion 13 pushes down the pin shaft 11, and the upright 31 attached to the rear portion of the tow bar 8 is operated by the operation of the steering handle 10. It can also be pushed deeper, so when the cultivated soil C is hard or the weight of the machine or work implement is light and the work implement floats shallowly, the work implement is pushed using the steering handle 10 and the stable predetermined depth with less vertical unevenness It is easy to make a groove, it is difficult for water to collect, drainage performance etc. can be maintained, and the roots of crops are hard to be damaged and can promote growth.
[0026]
Next, the protruding front end side of the guide arm 9 is lifted upward against the load direction, and the steering handle 10 is pushed down a little while the pin shaft 11 is released from the concave groove of the upper restricting portion 13, and then the guide arm When the lifting of the guide arm 9 is stopped in the load direction and the handle 10 is further lowered, the pin shaft 11 of the traction bar 8 is a concave groove on the upper side along the front edge 39 between the concave grooves of the guide arm 9. It automatically engages with a groove of a certain vertical locking portion 12.
[0027]
When the steering handle 10 is lifted upward in this engaged state (if the front part of the fuselage is heavy, the push-down force of the handle 10 is reduced), the central blade of the upright 31 that is one of the towing machines. The part 36 comes off from the tilled soil C, and the tiller part 1 in front of the machine body becomes a work implement lifting fixed posture A which is a posture removed from the soil, as shown in FIG. Yes.
[0028]
When the gauge wheel 22 provided in front of the rotary is lowered and fixed at the position indicated by the phantom line below the solid line, it is possible to easily travel on the road without pushing down the steering handle 10 and a large amount of force is required for steering. It becomes an easy-to-use machine without.
[Brief description of the drawings]
FIG. 1 is an enlarged side view of a main part.
FIG. 2 is a plan view of a main part.
FIG. 3 is an overall side view in a state of plowing or towing work.
FIG. 4 is an overall side view when turning or traveling on the road.
FIG. 5 is an overall plan view.
FIG. 6 is a cross-sectional view of the back side of the soil for explanation in a state in which the erecter is in operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plowing shaft 2 Wheel shaft 3 Transmission case 4 Engine 5 Support frame 6 Upper shaft 7 Lower shaft 8 Tow bar 9 Guide arm 10 Steering handle 11 Pin shaft 12 Vertical direction locking part 13 Vertical control part 14 Operation lever

Claims (1)

Front end cultivating shaft in the vicinity of the wheel shaft in the vicinity of the rear end portion (1) (2) respectively the left-right direction projecting long transmission case in the longitudinal direction (3), over the between the wheel shaft (2) from the longitudinal direction intermediate portion The engine (4) is mounted on the upper side, and the driving force of the engine (4) is transmitted to the transmission case (3) to drive and rotate both shafts. The rear portion of the transmission case (3) has an upper shaft ( 6) A support frame (5) provided with a guide arm (9) that moves downward by its own weight or spring force, and a pulling bar (8) that protrudes backward around the lower shaft (7) so as to be swingable in the vertical direction. Attach the handle (10) from the engine (4) and the support frame (5) to the rear and upward ,
A pin shaft (11) is provided at the front-rear direction intermediate portion of the tow bar (8), and the guide arm (9) is provided with an up-down direction locking portion (12) and an upward restriction from the side closer to the upper shaft (6). Providing a groove in the part (13),
When the pin shaft (11) of the tow bar (8) is operated to engage with the concave groove of the up-and-down direction locking portion (12), the lifting position of the towing work machine attached to the rear of the tow bar (8) is raised and fixed ( A), and when the pin shaft (11) of the tow bar (8) is operated to engage with the concave groove of the upper restricting portion (13), the lifting posture of the towing work machine attached to the rear portion of the tow bar (8) is pulled. A front rotary cultivator characterized by having a movable posture (B) .

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