JP2001238504A - Front rotary tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems that, in a walk-type tiller in which an engine and a tilling unit are placed respectively diagonally to the upper front and the lower front of a transmission case, the mounting place of the engine becomes high, and this causes poor balance during running, needs physical strength for operation, and generates instability in tilling depth and unevenness of tilled base due to the vertical motion of the front end of the machine body. SOLUTION: A front rotary tiller having the following structure. A tilling shaft 1 is placed at the front end of a transmission case 3 long in the longitudinal direction in a laterally protruding manner, a wheel shaft 2 is placed at the rear end of the transmission case 3 in a laterally protruding manner, and a rotary tilling unit and driving wheels are placed on the shafts, respectively. In an engine 4 which is mounted above the longitudinally middle part of the transmission case, a supporting frame 5, in which shafts 6 and 7 are placed on the upper and lower parts, a downward loading guide arm 9 is placed around the upper shaft 6, and a vertically swingable pulling lever 8 is placed around the lower shaft 7, is attached on the rear part of the transmission case 3. By the operation of the guide arm 9, the pulling lever 8 is switched between a hung-up fixed posture A and pulling swingable posture B. A groove-forming unit is attached on the rear part of the pulling lever 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of a front rotary tiller. The present invention relates to a work implement mounting device for attaching another work machine to a rear portion of a front rotary tiller, and performs another towing operation such as ridge-raising or grooving at the rear of the machine at the same time as cultivating the front of the machine. It is about to do.

[0002]

2. Description of the Related Art A transmission case which is long in the front-rear direction is constituted, and an engine above a middle part in the front-rear direction and a main shaft for transmitting power from the engine are arranged at a middle part in the front-rear direction, and a rotary tilling shaft is provided at a 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 a rear end of a transmission case portion, and a towing work machine is attached below the handle. In this conventional configuration, the towing machine is vertically movably mounted via two parallel links in the vertical direction when viewed from the side.

[0003]

In such a conventional rotary tiller, the towing machine located below the steering handle is vertically moved by a plurality of links while maintaining a side view posture. Therefore, it is difficult to maintain a constant depth of penetration of the towing machine into the soil, and the depth of the resistance of the soil tends to change easily depending on the resistance of the soil. It was very troublesome. In addition, since it is raised in parallel, the lower part of the rear end of the towing machine tends to be at a low position even when being lifted, and there is a tendency that the knee or shin of the operator walking while gripping the steering handle is likely to abut.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve such a disadvantage of the conventional device, and has taken the following technical means. That is, according to the first aspect of the present invention, the tilling shaft 1 is provided near the front end, and the wheel shaft 2 is provided near the rear end in the left-right direction. An engine 4 is mounted above and spans the space therebetween, and the driving force of the engine 4 is transmitted to the transmission case 3 to drive and rotate the two shafts. Guide arm 9 and downwardly swinging pulling bar 8 around lower shaft 7
Is a walking type cultivator in which a support frame 5 provided with a shaft is attached to a rear portion of the transmission case 3 and a handle 10 is provided to project rearward and upward from between the engine 4 and the support frame 5. 8 is a front rotary cultivator characterized by switching between a lifting fixed posture A and a towing swingable posture B.

According to a second aspect of the present invention, a pin shaft 11 is provided at an intermediate portion in the front-rear direction of a tow bar 8 protruding rearward with a lower shaft 7 as a swing axis, and its own weight or weight is set with an upper shaft 6 as an axis. The guide arm 9 which moves down by a spring force or the like has an upper shaft 6
The vertical locking portion 12 and the concave groove of the upper regulating portion 13 are provided from the near side, and the vertical locking portion 12 is engaged with the pin shaft 11 of the towing bar 8 to obtain a lifting fixed posture A. In the disengaged towing swingable posture B, the recessed groove of the upper regulating portion 13 of the guide arm 9 faces above the pin shaft 11 to switch the elevating posture of the towing work machine attached to the rear portion of the towing bar 8. A front rotary cultivator according to claim 1, characterized in that:

Further, according to a third aspect of the present invention, a protruding end of an operating lever 14 integrally protruding from the guide arm 9 is provided near a protruding tip of the handle 10. The front rotary tiller described in 2 was used.

[0007]

Operation and effect of the present invention When the cultivating shaft 1 located at the front part of the body of the front rotary cultivator is driven and rotated, the wheels are driven and rotated in the forward direction to run on the field, and the cultivating shaft 1 is sunk into the soil. The cultivator moves forward while excavating and crushing soil of a predetermined width and depth. A tow bar 8 for attaching a towing machine is attached to the supporting frame 5 attached to the rear part of the transmission case 3 so as to be vertically swingable around a lower axis.
For example, if the groove cutting blade is attached to the rear of the towing bar 8, the soil at the center in the left-right direction of the excavated soil after plowing is divided into two parts by the groove cutting blade, and a groove is formed at the center rear of the traveling machine. You can run while. As shown in the figure, the lower portions of the wheels and the groove cutting blades move forward in the soil excavated and crushed by the tilling shaft 1 due to the weight of the machine body while traveling with the towing machine. At this time, since the concave groove edge wall of the upper regulating portion 13 of the guide arm 9 is located above the pin shaft 11 of the tow bar 8, the rise of the tow bar 8 by a predetermined amount or more is restricted. When the pilot pushes down the steering wheel 10 strongly,
Since the support frame 5 moves down around the wheel shaft 2 and the guide arm 9 and the like also move down, the pin shaft 11 can be pressed by the upper regulating portion 13 so as to press the groove cutting blade deeper.

When turning at the end of the field or running on the road after finishing the grooving operation, the handle 10 is slightly pushed down while the guide arm 9 is lifted upward against the load direction, and then When the handle 10 is further lowered while lifting the guide arm 9 and moving downward in the load direction, the 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 machine is disengaged upward from the soil, and the tilling unit 1 in the front of the fuselage is in the posture shown in FIG. You.

Since the operating lever 14 is integrally formed with the guide arm 9 and protrudes below the handle 10, the position of the guide arm 9 with respect to the pin shaft 11 can be adjusted.
It can be easily performed near zero. According to the first aspect of the present invention, with the above-described configuration, the operation of the guide arm 9 causes the towing bar 8 to move.
In this case, the user can easily change the posture so as to perform a towing operation such as grooving or furrowing as a towing swingable posture B in which the towing bar 8 is moved down.

According to the second aspect of the present invention, the above-described configuration prevents the towing bar 8 from lifting more than a predetermined amount during towing work such as grooving or ridge setting in the towing swingable posture B. While maintaining a predetermined depth while pushing down the steering handle 10 downward, the guide arm 9
By pushing down the pin shaft 11 of the towing bar 8 by the upper regulating portion 13, the depth of the towing machine into the soil can be made deeper than a predetermined depth. At this time, while the guide arm 9 is lifted up against the load direction, the handle 10 is slightly pushed down, then the lift of the guide arm 9 is stopped, the guide arm 9 is moved down in the load direction, and the handle 10 is further lowered. Then, the pin shaft 11 of the tow bar 8 is
Vertical locking portion 1 which is a concave groove on the upper part of guide arm 9
2 are automatically engaged, and in this engaged state, the handle 10
When the tractor is returned upward, the towing work machine is disengaged upward from the soil, and the tilling unit 1 in front of the machine body is in the work machine lifting fixed posture in which the cultivator 1 is out of the soil, so that the turning operation and traveling on the road can be easily performed. You.

According to the third aspect of the present invention, the operation lever 14 can be operated in the vicinity of the operation handle 10 to fix the lifting position of the working machine and to switch the towing operation position. The cultivator can be easily operated while walking and maneuvering, and it is safe to concentrate on maneuvering.

[0012]

Embodiments of the present invention will be described below. An embodiment of this embodiment will be described with reference to FIGS. 1 is an enlarged side view of a main part, FIG. 2 is a plan view of the main part, FIG. 3 is an overall side view of a tractor cultivated at a front part of the fuselage, and a tractor is attached to a rear part of the fuselage, and FIG. FIG. 5 is an overall plan view when the machine is lifted and fixed and not in operation, and FIG. 5 is an overall plan view.

This embodiment relates to a front rotary tiller 1
5, the engine 4 is disposed at an upper portion between the middle and the rear of the transmission case 3 in the front-rear direction, and the driving force of the engine 4 is applied to a drive pulley 17 attached to the side of the crankshaft.
, V-belt 18 and driven pulley 19, and transmission case 3
To the main shaft 16 provided at an intermediate portion in the front-rear direction. The driving force transmitted to the main shaft 16 is transmitted to the left and right tilling shafts 1 and 1 projecting left and right at the front end of the transmission case 3 and the wheel shafts 2 and 2 projecting left and right at the rear end of the transmission case 3.

The transmission case 3 is disposed substantially horizontally in the front-rear direction, and a plurality of tilling claws 20, 20,. .
In the radial direction, the cultivation shaft 1 is driven and rotated to be pushed into the soil, so that the soil on the surface of the field is excavated and crushed by the width of the cultivation shafts 1 and 1 in one advance. This excavated and crushed soil state is shown in FIG. The tilling shaft 1 and the upper half of the tilling claw 20 are covered with a tilling cover 21, and the tilling cover 21 is attached to the transmission case 3 (not shown). Also,
A gauge wheel 22 is provided in front of the center of the cultivation cover 21, and by adjusting the height of the gauge wheel 22 in the vertical direction, the cultivation depth of the tilling shaft 1 can be adjusted. That is, when the gauge wheel 22 is lowered, the lowering of the tilling shaft 1 is quickly restricted at the wheel bottom surface, so that the cultivation depth becomes shallow. When the gauge wheel 22 is raised, the wheel bottom surface can be lowered until the wheel bottom surface contacts the soil surface. The cultivation depth is deep except when the tilling claw 20 is hard and does not stick.

When the soil of a predetermined width is excavated and crushed by the tilling claw 20, the soil at that portion becomes soft, so that the drive wheel 23 attached to the wheel shaft 2 with a tread narrower than the predetermined width.
As shown in FIG. 3, the left and right wheels run while traveling in the soil. Thus, the front rotary tiller 15 is
The transmission case 3 is lengthened in the front-rear direction, and the engine 4 is mounted at a lower position on the rear half of the transmission case 3 to lower the machine center of gravity, thereby stabilizing work.

The left and right transmission case halves are joined and fixed to the left and right flank portions with bolts and nuts to form a transmission case 3 which is long in the front-rear direction, and is used as a main frame.
The left and right transmission case halves are bent horizontally at both the left and right sides of the upper and lower intermediate portions of the front and rear middle portions to form a flat engine mounting portion, and this engine mounting portion is disposed near the upper side of the main shaft 16. The engine 4 is mounted on the engine mounting portion.

A V-belt 18, which is a transmission belt, is wound around a drive pulley 17 attached to a driving shaft of the engine 4 and a driven pulley 19 attached to the main shaft 16, so that power is transmitted. The main clutch is configured such that the power is interrupted by tension or relaxation by a tension clutch (not shown).

A transmission is provided between the wheel shaft 2 and the main shaft 2 at the rear of the transmission case 3, and the transmission lever 24 is operated so that the driving wheels 23 can move forward or backward at a required speed. Further, left and right side clutches are provided on the wheel axle 2, respectively, so that the driving force inside the turning is cut off when turning left and right, so that the turning is easy.

At the rear of the transmission case 3, a support frame 5, which is a main part of the present invention, is mounted. 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 to the front and bottom, and a rear upper and lower welded upper pipe 27. It consists of a lower pipe 28. The left and right collars 26, 26 at the front of the support frame 5
The gap between them is fastened with bolts 30, 30 so as to sandwich the flan # 29, which is the mating surface of the transmission case 3, left and right, and is integrally attached to the rear portion of the transmission case 3.
As described above, the right and left rear ends of the left and right frame plates 25 and 25 are integrally welded left and right by the upper pipe 27 and the lower pipe 28, and the upper shaft 6 such as a pin shaft mounted in the upper and lower pipes. The guide arm 9 is attached to the upper shaft and the tow bar 8 is attached to the lower shaft via the lower shaft 7.

On the left and right of the upper surface of the transmission case 3 between the engine 4 and the supporting frame 5, there are provided half-split left and right hollow columns 38, 38 projecting obliquely rearward and upward.
0 The lower end is clamped from the left and right, and fixed with bolts. As shown in a plan view, the steering handle 10 has a protruding upper end portion formed as a loop-shaped horizontal bar 10a so that it can be easily gripped in the left-right direction, and a base end portion for mounting as a single rod-shaped pipe 10b. To facilitate attachment to the hollow support 38.

A pin shaft 11 serving also as a reinforcement is provided at a middle portion in the front-rear direction of a pair of left and right traction bars 8 projecting rearward with the lower shaft 7 of the support frame 5 as a swing axis and a single side view and a plan view. The guide arm 9, which protrudes from the upper shaft 6 and moves downward by its own weight or spring force with the upper shaft 6 as an axis, has concave grooves of the vertical locking portion 12 and the upper regulating portion 13 from the side closer to the upper shaft 6. Is provided. Further, an operation lever 14 projecting downward at the steering handle 10 side is integrally attached to a lower end portion which is a projecting distal end of the guide arm 9.

As shown in FIG. 4, when the vertical locking portion 12 is engaged with the pin shaft 11 of the tow bar 8, the tow bar 8 is vertically fixed at the lifting position.
Although this position will be described in detail later, the position is a lifting fixed posture A. FIG. 3 is an overall side view of FIG. 3 showing the state of the towable rocking posture B in which the engagement is released. In the towing swingable posture B, as shown in FIG. 1, the recessed groove of the upper regulating portion 13 of the guide arm 9 faces the pin shaft 11 of the towing bar 8, and the towing work is attached to the rear portion of the towing bar 8. The upward movement of the ridger 31, which is a machine, exceeds a predetermined amount. The pin shaft 11 escapes downward in the vicinity of the concave groove of the upper regulating portion 13, and can move vertically between the contact portions of the upper regulating portion 13 of the guide arm 9 upward, with the upper shaft 6 as the axis. A vertical slide edge 32 is provided below the guide arm 9 so that the lower end of the guide arm 9 that moves down by its own weight or a spring force does not largely come off in the forward direction. Guide the movement.

At the rear end of the tow bar 8, there is provided a holder 33 having an opening in the vertical direction, into which a stay 34 of the ridger 31 is inserted in the vertical direction. It is attached so that the up-and-down position can be adjusted by the locking tool 35. The ridger 31 divides the soil into left and right sides by forming a groove in the soil by advancing through the cultivated and excavated soil, and dividing the soil into left and right by a central blade portion 36 whose tip is pointed in a V-shape in plan view and side view. It is. And when the grip 37 is turned, the fulcrum 3
8, the suction angle of the central blade 36 can be changed,
The depth at which the central blade 36 can stably enter the soil can be adjusted. Numeral 39 denotes an adjusting handle, which can change the vertical height of the tail wheel 40 by rotating, thereby adjusting the depth at which the ridger 31 can stably enter the soil.

As described above, in the towing and swinging posture B shown in the entire side view of FIG. 3, the cultivation cultivation is performed by digging the hard soil H on the field surface with the cultivation shaft 1 at the front of the fuselage while digging the soil for a predetermined width. Then, the drive wheel 23 moves forward while passing through the crushed tilling soil C. Then, on a support frame 5 attached to the rear part of the transmission case 3, a ridger 31 attached to the rear part of one tow bar 8 movably provided vertically,
As shown in FIG. 6, the vehicle divides the cultivated soil C in the left-right direction and travels.

At this time, the upper regulating portion 1 of the guide arm 9
3 and the vertical slide edge 32 restrict the pin shaft 11 of the tow bar 8 to a certain extent up and down, while restricting the upward movement of the pin shaft 11 by a predetermined amount or more after the pin shaft 11 comes into contact with it. In this state, when the driver pushes down the steering handle 10 downward, the upper regulating unit 13 pushes down the pin shaft 11, and the ridger 31 attached to the rear portion of the tow bar 8 is operated by operating the steering handle 10. When the cultivated soil C is hard, or the weight of the body and the working machine is light, and the working machine rises shallowly, the working machine is pushed in using the steering handle 10 so that the working machine can be pushed deeper, and a stable predetermined depth with less vertical unevenness can be obtained. It is easy to make a groove of water, it is difficult for water to collect, and drainage performance etc. can be maintained,
The root of the crop is hard to be damaged and promotes growth.

Next, the protruding tip side of the guide arm 9 is lifted upward against the load direction, and the pin shaft 11 is released from the concave groove of the upper regulating portion 13, and the steering handle 1 is moved.
0 slightly, then lift the guide arm 9 and lower the guide arm 9 in the load direction to
Is further lowered, the pin shaft 11 of the tow bar 8 automatically engages with the groove of the vertical locking portion 12 which is the upper concave groove along the front edge 39 between the concave grooves of the guide arm 9.

In this engaged state, the steering handle 10 is lifted upward (when the front part of the body is heavy, the pushing-down force of the handle 10 is reduced.), The ridger 31 which is one of the towing work machines. The center blade portion 36 of the cultivator 1 is disengaged upward from the cultivated soil C, and the cultivated portion 1 in front of the fuselage is in a lifting position A for lifting the working machine, which is a posture that has come off from the soil, as shown in FIG. Can be easily performed.

When the gauge wheel 22 provided at the front of the rotary is lowered from the solid line to the position shown by the imaginary line and fixed, the vehicle can easily travel on the road without depressing the steering handle 10, and the steering force is reduced. The machine is easy to use because it does not require much.

[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 tilling or towing operation state.

FIG. 4 is an overall side view at the time of turning or traveling on a road.

FIG. 5 is an overall plan view.

FIG. 6 is an explanatory soil rear cross-sectional view in a ridger working state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tilling 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 locking portion 13 Vertical regulating portion 14 Operating lever

Claims (3)

[Claims] 1. A tilling shaft 1 is provided near a front end and a wheel shaft 2 is provided near a rear end in a left-right direction. 4 that transmits the driving force of the engine 4 to the transmission case 3 to drive and rotate the two shafts, wherein shafts 6 and 7 are disposed at upper and lower portions and a downward dynamic load is applied around the upper shaft 6. A support frame 5 provided with a guide arm 9 and a tow bar 8 that can swing vertically around a lower shaft 7 is attached to the rear of the transmission case 3, and a handle 10 that projects rearward and upward from between the engine 4 and the support frame 5 is provided. A front rotary cultivator, comprising: a traction bar that lifts a traction bar 8 by operating a guide arm 9 and switches between a fixed posture A and a traction swingable posture B. 2. A pin shaft 11 is provided at an intermediate portion in the front-rear direction of a tow bar 8 projecting rearward with a lower shaft 7 as a swing axis, and a guide that moves down by its own weight or a spring force with the upper shaft 6 as an axis. The arm 9 is provided with concave grooves for the vertical locking portion 12 and the upper regulating portion 13 from the side closer to the upper shaft 6, and
The vertical locking portion 12 is engaged with the pin shaft 11 so as to be in the lifting fixed posture A, and when the traction swingable posture B is released from the engagement, the upper regulating portion of the guide arm 9 is provided above the pin shaft 11. 2. The front rotary tiller according to claim 1, wherein the up / down posture of the towing machine attached to the rear portion of the towing bar 8 is switched so as to face the 13th groove. 3. The front rotary tiller according to claim 1, wherein a protruding end of an operation lever integrally protruding from the guide arm is provided near a protruding tip of the handle.