JPH0665251B2 - Power farm - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a power agricultural machine tow and use a working machine such as a rice transplanter.

(Prior Art) As a type of self-propelled power farming machine equipped with a work machine such as a rice transplanter via a hydraulic lifting device, when the work device is lifted, the gear shifting wire of the continuously variable transmission is pulled in association with it. There is a power farming machine configured to automatically reduce the traveling speed.

(Problems to be Solved by the Invention) However, in the above-described conventional power farming machine, it is not possible to shift gears while the working machine is lifted, and further, when the working machine is lowered, the traveling speed rapidly increases. Therefore, there is a problem that stable work cannot be performed.

(Means for Solving Problems) In order to solve the above problems, the present invention has the following configuration. That is, the power farming machine according to the present invention is a self-propelled power farming machine in which a working machine such as a rice transplanter is mounted via a hydraulic lifting device, and is provided with an operating lever that doubles as a working machine lifting lever and a shifting lever. When the working machine is lifted, the traveling rotary power output from the engine is decelerated in conjunction with the operation of the operation lever, and when the working machine reaches a preset non-working rising position, the operation is performed. The lever is automatically returned to the neutral position, and the reduction ratio of the rotational power for traveling can be arbitrarily switched by the operation lever within the range of the neutral position.

(Operation) When the working machine is lifted, the traveling speed is automatically reduced, and when the working machine moves up to a predetermined position, the operation lever returns to the neutral position. Then, when the operating lever is operated within the range of the neutral position, the traveling speed can be changed while the working position is kept raised.

(Embodiment) FIG. 1 is a side view of an embodiment of a power farming machine according to the present invention, in which essential parts of the invention are shown in cooperation with each other. Also,
FIG. 2 is an explanatory diagram showing the mutual relationship of the main parts.

In this power farm machine 1, an engine 3 is installed in the front part of a machine body 2, and the rotational power of the engine 3 is transmitted to a transmission device via a continuously variable transmission 5 that constitutes a transmission device 4. The transmission device is provided in a mission case 6 located at the center of the machine body 2. The bases of chain cases 7, 7 extending rearward are attached to the left and right sides of the mission case 6. Further, rear wheels 9 and 9 are rotatably supported at the rear ends of the chain cases 7 and 7 and are rotatably driven by power from a transmission device transmitted by the chain stretched inside the chain cases 7 and 7. It is like this. Further, front wheels 10, 10 are provided on both sides of the front part of the mission case 6 so as to be able to turn.

The cockpit 11 is installed above a rear view gate type frame body 13 that connects the left and right chain cases 7, 7 to each other. Cockpit 11
A steering handle 14 is provided on the front of the vehicle, a chain lever 16 is provided on the floor 15, and an operating lever 17 for raising and lowering the working machine is provided on the side of the cockpit 11.

Protrusion frames 20 and 20 are provided inside the frame body 13, and one upper link 21 is rotatably supported in the space between them. Also, a pair of left and right lower links 22,2 parallel to the upper link 21.
2 is provided, and its front end is rotatably attached to the projecting frames 20, 20. Rear ends of the upper and lower links 21, 22, 22 are attached to the connecting frame 23. These top and bottom links
21, 22, 22, the projecting frames 20, 20, and the connecting frame 23 constitute a parallel link device 24 which can be turned up and down as a whole.

A piston rod of a hydraulic cylinder 25 as a working machine lifting device pivotally attached to the mission case 6 is connected to an intermediate portion of the upper link 21. When the hydraulic cylinder 25 is extended, the upper link 21 is swung upward. In the illustrated example, a rice transplanter is installed as a working machine.

The rice transplanter 26 is a seedling tank 28 that is installed above the transmission case 27 that also serves as a rice transplanter frame so that the front side is inclined upward.
And a planting rod 29 provided with a planting claw 29a at the tip end, which takes out one plant from the nursery placed on the seedling tank 28 while moving up and down in an elliptical orbit and planting it in the field. It has On the lower side of the transmission case 27, one center float 30 and a pair of left and right side floats 31, 31 are pivotally mounted so as to be vertically rotatable.

The continuously variable transmission 5 constitutes the transmission 4 together with the operating lever 17 and the like, and includes a variable diameter pulley 41 attached to the output shaft 40 of the engine 3 and a transmission shaft 42 connected to the transmission.
Fixed diameter pulley 43, both pulleys 41,43
The belt 45 is stretched around the belt 45 and a tension adjusting device 46 for adjusting the tension of the belt 45. The variable diameter pulley 41 is
It is made by combining two discs 41a and 41b having a conical peripheral edge, and the belt changes when the distance between the two discs changes.
The effective radius that touches 45 changes. One disc 41a is constantly urged by the spring 47 toward the other disc 41b. In the tension adjusting device 46, a tension pulley 50 is rotatably provided at the tip of a swingable support rod 49, and the tension pulley 50 is engaged with the inner surface of the belt 45. An operation wire 51 is attached to an intermediate portion of the support rod 49. In addition to the variable diameter pulley 41, a hydraulic pump driving pulley 53 is attached to the output shaft 40, and a transmission belt 57 hung between the pulley 53 and a pulley 56 attached to the drive shaft of the hydraulic pump 54. The hydraulic pump 54 is driven by.

As described above, the base of the hydraulic cylinder 25 is pivotally attached to the mission case 6, but the connection between the piston rod 25a and the upper link 21 has a buffer structure. That is, the tip end of the piston rod 25a is fitted into the recess 60a of the connecting tool 60 attached to the upper link 21, and the pin 60b of the connecting tool 60 is slidable in the longitudinal hole formed in the end of the connecting tool 60. Is fitted to. Then, a buffer spring 62 is interposed between the brim 61 and the connecting tool 60, which are integrally provided in the intermediate portion of the piston rod 25a. In addition, the rod 64 for returning to the neutral position is
It is slidably inserted in parallel with 25a into a through hole of a support piece 65 integrated with the cylinder 25 and a through hole 66 provided in the collar 61. A tip end portion of the return rod 64 projects forward from the collar 61, and a flat plate-shaped stopper 68 is fixed to that portion, and a wire 69 inserted through a tubular body 70 is connected to the other end portion.

The operation lever 17 has a base portion attached to a valve shaft 72 of a hydraulic valve 71, and the hydraulic valve 71 is switched by rotating the valve shaft 72 back and forth, so that the hydraulic pump 54 is hydraulically fed from the hydraulic pump 54 to the hydraulic cylinder 25. Can be switched. The operation guide groove 74 of the operation lever 17 is the sixth
It looks like the figure. That is, a plurality of engaging recesses S ₁ , S _2, ... Are provided in the central portion N of the groove. Operating lever 1
7 is always pressed in the direction of the engaging recess S by a spring 75 loosely fitted to the valve shaft 72. Operating lever 17
Is in the range “N”, the hydraulic cylinder 25, which is the lifting device, is in a neutral state, and the hydraulic cylinder 25 does not operate in either expansion or contraction direction. When the operating lever 17 is tilted to the range “U”, the hydraulic cylinder 25 is extended to lift the rice transplanter 26, and when the operating lever 17 is tilted to the range “D”, the hydraulic cylinder 25 is contracted and the rice transplanter 26 is lifted. Is unloaded. The wires 51 and 69 are connected to the intermediate portion of the operating lever 17.

This power farming machine 1 drops the rice planting device 26 on the field scene during the planting work, and the buoyancy of each float 30, 31, 31 causes the rice planting device 26 to grow.
26 is used in a slightly raised state. When turning, the operation lever 17 is tilted to the range "U" and the rice transplanter 26 is moved upward just before turning, but the wires 51 and 69 are pulled by this lever operation. Wire 5
When 1 is pulled, the support rod 49 of the tension adjusting device 46 rotates in the X direction, so that the belt 45 is pushed outward and the tension of the belt 45 increases, and the variable-diameter pulley 41 that contacts the belt 45. The effective diameter of becomes smaller. Therefore, the traveling speed of the power farm machine 1 is automatically reduced, and the vehicle can smoothly turn. At the same time, since the driving force of the rear wheels 9 is strengthened, the rear wheels 9 are lifted by lifting the rice transplanter 26
Even if the load on the vehicle is increased, the vehicle can travel without causing a stall or the like. Next, when the wire 69 is pulled, the return rod 64 is once retracted by it, but when the protrusion of the piston rod 25a progresses, the stopper 6 is pushed by the collar 61.
Since 8 is pushed, the return rod 64 advances. When the rice transplanter 26 is lifted up to a predetermined height by the piston rod 25a protruding by a predetermined amount, the operating lever 17 connected to the return rod 64 via the wire 69 is pulled back to the neutral position "N", and the rice transplanter 26 The upward movement stops. At this time, the operation lever 17 is operated by the spring 75 so that the first engaging recess S ₁
Engage with. The engaging recess S ₁ is in the lowest speed range, and S ₂ , S ₃ , ...
The lower the tension of the belt 45, the higher the traveling speed. Since the range "N" is in the neutral (neutral position), the operating lever 17 can be freely moved to change gears within this range regardless of whether the working machine is lifted or lowered. In the conventional power agricultural machine with an automatic speed reducer, the automatic speed reduction mechanism is released as soon as the rice transplanter is lowered, so the speed may be rapidly increased. Since it is possible to accelerate the speed, it is possible to prevent an unexpected speedup. Therefore, stable operation can be performed, and swiveling can be speeded up.

(Effect) As is clear from the above description, the power farming machine according to the present invention includes an operating lever that also serves as a working machine lifting lever and a shifting lever, and is linked to the operation of the operating lever when lifting the working machine. Since the traveling rotary power output from the engine is decelerated, the stability is good when the working machine is raised to make a turn. Further, when the working machine reaches a preset non-working raising position, the operation lever automatically returns to the neutral position, and the speed reduction ratio of the traveling rotary power is operated within the range of the neutral position. Since it can be arbitrarily switched by the lever, it is safe because the traveling speed does not suddenly increase when the lifted work implement is lowered. For this reason, the traveling performance during turning is improved,
Work can now be performed stably.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a power farming machine according to the present invention,
FIG. 2 is an explanatory diagram showing the relation of the main part, and FIG.
FIG. 6 to FIG. 6 are explanatory views of each part. 1 ... Powered agricultural machinery, 2 ... Airframe, 3 ... Engine, 4 ...
Transmission: 5 ... continuously variable transmission, 9 ... rear wheel, 10 ... front wheel, 17 ... operating lever, 25 ... hydraulic cylinder, 26 ... rice transplanter, 46 ... tension adjusting device, 51, 69 …… Wire, 64 ……
Return rod

Claims (1)

[Claims] 1. A self-propelled power agricultural machine in which a working machine such as a rice transplanter is mounted via a hydraulic lifting device, and an operating lever that doubles as a working machine lifting lever and a shifting lever is provided, and the working machine is installed. When lifting, the running rotational power output from the engine is decelerated in conjunction with the operation of the operating lever, and when the working machine reaches the preset non-working raising position, the operating lever is automatically operated. A power farming machine characterized by being able to return to the neutral position and to arbitrarily switch the reduction ratio of the rotational power for traveling within the range of the neutral position with an operating lever.