JP2654667B2 - Power reduction mechanism for riding type seedling planter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power reduction mechanism in a riding type seedling planting machine having a high-speed planting function provided with planting claws at each end of a gear case. .

[Problems to be Solved by the Prior Art and the Invention] Today, in this seedling planting machine, planting claws are provided at each end of a gear case that houses a gear mechanism, and the input shaft of the planting claws is rotated. There is known a so-called high-speed planting type in which seedlings are individually planted by each planting claw, and such a high-speed planting work section secures a high working speed. It is common to attach it to a traveling machine body, and moreover, one gear case is provided with two planting claws.

By the way, in such a device, when the power from the engine side provided in the traveling machine body is input to the planting work unit, the rotation speed of the working unit power input shaft provided in the planting work unit corresponds to the high-speed planting type. Instead, one planting claw is provided in the planter case, for example, in order to correspond to a normal type that performs one seedling planting operation with one rotation of the power input shaft of the working part, The fact is that it has not been changed to one dedicated to high-speed models.

As a result, when a high-speed planting work section is installed,
The input shaft for the planting claw, which is the final stage of power transmission, needs to transmit power by decelerating to the reciprocal of the number of planting claws (half when there are two planting claws) with respect to the rotation of the working unit power input shaft. Occurs.

However, conventionally, this deceleration was performed by providing a necessary speed reduction mechanism in the power transmission mechanism from the intermediate shaft, which is the final power transmission mechanism to the planting claw input shaft, to the planting claw input shaft, Since the diameter of the sprocket mounted on the input shaft for the planting claw is inevitably large, the case for covering it must be large, and such a gear case is provided at the rear end of the working frame. Therefore, the rear weight of the planting work section becomes heavy, and as a result, the front-rear balance of the traveling body is changed when the high-speed working section is attached to the traveling body instead of the normal working section. However, there is a problem that it is impaired.

Means for Solving the Problems In view of the above-described circumstances, the present invention has been made with the object of providing a power reduction mechanism in a seedling planting machine that can eliminate these drawbacks. At the rear of the fuselage, the engine power of the traveling fuselage is transmitted to the working unit power input shaft, the intermediate shaft, to the input shaft for the planting claw arranged at the rear end of the working unit frame, and to the input shaft for the planting claw. In a riding-type seedling planting machine in which a planting work portion provided with a planting claw portion at each of a plurality of ends of a provided gear case is vertically movable, between the working portion power input shaft and the intermediate shaft, Interlockingly connected via a power transmission mechanism having a first reduction mechanism, and interlockingly connecting the intermediate shaft and the input shaft for the planting claw section via a power transmission mechanism with a second reduction mechanism, The first reduction mechanism is The speed reduction ratio is set to be larger than that of the second speed reduction mechanism.

According to the present invention, the reduction ratio of the reduction mechanism in the final stage can be made as small as possible.

Example Next, an example of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a planting work section attached to a rear portion of a riding type traveling body so as to be able to move up and down vertically, and the planting work section 1 includes a seedling table 2 and a float 3 that reciprocate right and left and a work section frame. 4 and the like, a planting claw 5 described below is arranged at the rear of the working unit frame 4. That is, at the rear end of the working unit frame 4,
A gear case 6 is provided rotatably. An input shaft 8 for a planting claw portion, into which power of a working unit is inputted by a chain 7, is integrally provided on an outer plate of the gear case 6 via a key 8b. It is fixed to. It should be noted that the clutch claw shaft 8a spline-fitted to the planting claw input shaft 8 and the boss shaft of the sprocket 7a of the chain 7, which is freely rotatable around the planting claw input shaft 8, are provided. An intermittent clutch 9b is provided for stopping the power transmission to the input shaft 8 for the planting claw portion.

In this embodiment, the working unit power input shaft 1a of the working unit 1
The power is transmitted to the intermediate shaft 1c via the bevel gear mechanism 1b, and the power is transmitted from the intermediate shaft 1c to the input shaft 8 and the lateral feed shaft 2b for the seedling rest by each chain transmission. However, in the embodiment, in the power transmission from the working unit power input shaft 1a to the intermediate shaft 1c by the selection of the number of teeth of the bevel gear mechanism 1b, the speed is reduced by "2/3", and the intermediate shaft 1c
The power transmission from the sprocket 1d to the sprocket 7a of the input shaft 8 for the planting claw is also set so that the speed can be reduced by "3/4" by selecting the number of teeth. , That is, the power transmission from the working unit power input shaft 1a to the planting claw input shaft 8 is performed at a speed reduction ratio that is the reciprocal of the number of planting claws. On the other hand, the power transmission from the intermediate shaft 1c to the traverse feed shaft 2b is also decelerated by "3/4" by the selection of the number of teeth. It is set to perform traversing.

On the other hand, reference numeral 9 denotes a sun gear that is rotatably supported on the input shaft 8 for the planting claw portion and is integrated with the working portion frame 4 side in a state of being prevented from rotating through the claw portion 9a, A pair of intermediate gears 10 mesh with the sun gear 9 in such a manner that they are out of phase with each other by 180 degrees. Further, each intermediate gear 10 is meshed with a final gear 11.
The above-described planting claw 5 is provided on a cylindrical output shaft 12 into which the final gear 11 is integrally spline-fitted, as described later, and the planting claw 5 is positioned via a gear transmission mechanism. It is configured to be controlled. Further, the sun gear 9, intermediate gear 10, and final gear 11 are all formed of eccentric gears (of course, they may be elliptical gears or non-circular gears). Then, with the rotation of the gear case 6 interlocked with the rotation of the input shaft 8 for the planting claw portion to perform the planting operation, the intermediate gear 10 revolves around the sun gear 9 fixed to the frame 4 while revolving around. Further, the operation of the intermediate gear 10 causes the final gear 11 to revolve while rotating in the reverse direction (the direction of the arrow Y), whereby the output shaft 12 rotates,
Due to the rotation of the output shaft 12 and the rotation of the gear case 6, the planting claw 5 changes the posture with respect to the gear case 6 so as to always face the seedling mounting table 2 side, so that a fixed planting is performed as described later. It works by drawing a trajectory.

A first cam 13 constituting a cam mechanism is rotatably provided on an intermediate gear shaft 10a that supports the intermediate gear 10, and the first cam 13 is interposed between the first cam 13 and the gear case 6. The second cam 15 is pressed by the urging force of the elastic machine 14. The second cam 15 is set to rotate integrally with the final gear 11 integrally fixed to the output shaft 12.
In the above-described planting operation, the planting claw portion 5
In the planting locus, the cam projection 15a of the second cam 15 exceeds the cam projection 13a of the first cam 13 during the ascending process from the bottom dead center to the top dead center, and at this time, the first cam 13 The movement of the planting claw portion 5 in the direction of the top dead center is braked by the swinging opposition to the above. Two cam 15
Conversely, it is pressed from the rear side by receiving the urging force of the ram 14, so that the planting claw 5 is in a state where the claw tip is directed outward of the planting locus, and the gear meshing clutch is engaged. In the state in which the backlash is absorbed, the tip of the claw is configured to scrape the plant seedlings on the seedling receiving body 16 provided at the lower end of the seedling mounting table 2.

On the other hand, reference numeral 17 denotes an operating shaft which is rotatable about the output shaft 12 and is fixed to the gear case 6, 17a denotes a cam body provided at an end of the operating shaft 17, and 18 denotes a planter arm (planter case) 5a.
, A planter fork, 19 is a planta fork, 20 is a pressurizing machine that constantly urges the planta fork 19 toward the retracting side, 21 is a pivotally supported by a planter arm 5a via a support shaft 21a and a distal end 21b. Is an operating arm engaged with the upper end of the planter fork 19, and 21c is a cam arm formed on the operating arm 21 so as to contact the cam body 17a. And Planta Fork 19, Ammunition 20
In a state in which the seedlings are pushed by the cam body 17a, the cam plant 17a pushes the planted seedling held by the planter beak 18 by the cam operation. Moreover, the planter arm 5a
Is mounted on the output shaft 12 as follows. That is, the inner edge of the planter arm 5a is connected to the flange 12 of the output shaft 12.
The fitting bolt 12b penetrating through the a is loosely fitted into the long hole 5b formed in the planter arm 5a, and is fitted to the flange portion 12a in a state where the bolt is tightened. An adjustment bolt 5c screwed into the surface is abutted against the flange portion 12a, and the mounting angle with respect to the output shaft 12 can be adjusted by adjusting the adjustment bolt 5c. In the figure, reference numeral 12c denotes a seal member attached to the fitting portion of the planter arm 5a, and 12d denotes a shim for adjusting the position in the axial direction.

Further, the locus of the planter beak 18 is as shown by the eccentric system of the gear mechanism. That is, the imaginary line P connecting the top dead center A (top point) and the bottom dead center B (bottom point) is substantially vertical, and the top dead center side is slightly rearwardly swelled in the rising trajectory. In the descending trajectory, the width K of the forward protruding trajectory from the virtual line P is smaller than the interval L between the upper and lower dead centers A and B (K / L <1/3) is set so that the descending locus does not bulge forward, but in this case, the locus position C that exits from the seedling receiving plate 2a of the planter beak 18 and the locus C The imaginary line Q connecting the immersion locus position D is also substantially vertical, and the forward protruding trajectory width E from the imaginary line Q until the planted seedlings are scraped from the seedling mounting table 2 and immersed on the rice field surface is equal. The interval F between the imaginary lines P and Q is smaller than approximately half (E / F <1/2), and the planted seedlings are scraped and planted on the rice field. It is set so that the forward swelling at the time of lowering in the air until it is attached is small.

In the embodiment of the present invention configured as described above, the gear case 6 makes one rotation by the rotation of the input shaft 8 for the planting claw portion in synchronization with the traveling of the machine body, whereby each planting claw is made. The part 5 moves along the planting locus, and the planted seedlings placed on the seedling mounting table 2 are scraped by the planting unit amount and planted on the rice field. The power transmission by the deceleration is not performed by reducing the speed in half at a time in the final chain transmission stage from the intermediate shaft 1c to the input shaft 8 for the planting claw as in the related art.
The first deceleration with a large reduction ratio is performed at the stage of power transmission from the working unit power input shaft 1a to the intermediate shaft 1c.

Therefore, the speed reduction ratio in the process of power transmission from the intermediate shaft 1c to the planting claw input shaft 8 in the final stage becomes smaller by that amount, and the final reduction ratio provided on the planting claw input shaft 8 is reduced. The diameter of the sprocket 7a of the reduction gear becomes small. For this reason, the size of the case body that covers this can be reduced and the weight and compactness can be achieved, and the rear weight of the planting work section 1 can be reduced, whereby the high-speed type planting work section 1 can be mounted. In this case, it is possible to prevent the front-rear balance of the traveling body from being lost.

Also, in this case, the forward protruding locus width K of the descending locus of the planter beak 18 with respect to the distance L between the upper and lower dead points A and B is smaller than substantially "1/3", and the front protruding locus bulges greatly. This effectively prevents the planted seedlings that have been scraped off and fall down due to the inertia of movement in the front-rear direction. In the aerial movement locus of the planted seedlings, the forward protruding locus width E is also
It is set so as to be approximately half or less of the front-rear movement width F from the time when the planting seedling enters the rice field to reach the bottom dead center B.

For this reason, when the planted seedlings move in the air, especially when the posture is easily changed, the moving inertia force in the front-rear direction is reduced, so that the seedlings can be planted by rushing into the rice field in an orderly posture without falling down, and the planting performance is improved. There is an advantage that improvement can be measured.

[Effects] In summary, since the present invention is configured as described above, in performing a reciprocal shift of the number of planting claws provided on the gear case on the planting work unit side, the operation unit power input shaft The first deceleration with a large reduction ratio is performed in the process of reaching the intermediate shaft, and the deceleration in the process of reaching from the intermediate shaft to the input shaft for the planting claw is power transmission in a state in which the second deceleration with a small reduction ratio is performed. Is done.

As a result, the sprockets and gears of the final reduction stage incorporated in the input shaft for the planting claw portion, which is the final reduction stage, have the dispersion of the reduction ratio by the first and second reductions and the reduction ratio of the first reduction by the second reduction ratio. Since the diameter is larger than the deceleration, the diameter can be small, so that the case that covers them can be reduced in weight and size, and as a result, the gear case can be used for the high-speed type planting work section arranged at the rear end of the work section frame. Since the rear weight can be reduced, it is possible to reduce the loss of the front-rear balance of the traveling body when it is attached.

[Brief description of the drawings]

The drawings show an embodiment of a seedling planting machine according to the present invention. FIG. 1 is a side view of a main part of a planting part, and FIG. 2 is an enlarged side view of a gear case part with a part cut away. FIG. 3 is a plan view of the same cross section, and FIG. 4 is a mechanism diagram of power transmission. In the drawing, 1 is a planting working unit, 1a is a working unit power input shaft, 1b is a bevel gear mechanism, 1c is an intermediate shaft, 4 is a working unit frame, 5 is a planting claw, 6 is a gear case, 7 is a chain, 7a Is a sprocket, and 8 is an input shaft for a planting claw.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiromasa Kajitani

Claims (1)

(57) [Claims] An engine power of a traveling body is transmitted to a rear part of the traveling body via a working part power input shaft and an intermediate shaft to an input shaft for a planting claw disposed at a rear end of the working part frame. In a riding-type seedling planting machine having a planting work section having planting claws provided at a plurality of ends of a gear case provided on a claw input shaft, the planting working section being vertically movable, the work section power input shaft and an intermediate portion are provided. The shaft and the shaft are interlockingly connected via a power transmission mechanism having a first reduction mechanism, and the intermediate shaft and the input shaft for the planting claw portion are connected via a power transmission mechanism having a second reduction mechanism. A power reduction mechanism for a riding-type seedling planting machine, wherein the first reduction mechanism is operatively connected to the first reduction mechanism, and the first reduction mechanism is set to a reduction ratio larger than that of the second reduction mechanism.