JP4436063B2 - Transplanter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transplanter such as a rice transplanter equipped with a planting mechanism for scraping seedlings from a seedling stand and planting them in a field.
[0002]
[Prior art]
In recent years, with this type of transplanter, there have been attempts to expand the planting stock in consideration of the growth conditions (sunshine, ventilation, etc.) of the planted seedling. Since the distance between planted plants is set as a standard, if the planting mechanism operating speed (relative to the vehicle speed) is slowed to increase the planting plant spacing, the amount of forward movement of the planting claws as the aircraft progresses is reduced. There is a risk that the planted seedlings will be dragged.
[0003]
Therefore, by changing the planting operation speed in one cycle at a non-uniform speed without changing the planting cycle of the planting mechanism, the planting claw operation speed in the soil during planting can be increased. It has been proposed to prevent dragging (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-224213 (page 5-6, FIG. 4)
[0005]
[Problems to be solved by the invention]
However, in the one shown in Patent Document 1, the planting mechanism is always operated at a non-uniform speed. As a result, the operating speed in the soil is unnecessarily increased, and fluctuations in the driving load increase to increase vibration.
[0006]
[Means for Solving the Problems]
The present invention was created for the purpose of solving these problems in view of the above situation, and in a transplanter equipped with a planting mechanism for scraping seedlings from a seedling stand and transplanting them to a field, In order to deploy a stock shifting mechanism that shifts the planting drive speed to the traveling speed in multiple stages in the transmission path that transmits the power from the engine to the planting mechanism
The second inter-gear transmission mechanism, in which the lowest speed stage by the non- constant gear transmission appears on the downstream side of the transmission of the first inter-gear transmission mechanism that performs a multi-stage shift by the constant speed gear transmission, is set in the serial transmission state. Deployed and configured, the gear position of the first inter-stock transmission mechanism and the second inter-mechanism transmission mechanism can be selected selectively, and the constant-speed transmission is switched in accordance with the gear shifting operation of the second inter-stock transmission mechanism to the small stock side. In addition, it is configured to switch to non-constant speed transmission in accordance with the shifting operation to the wide stock side, and the torque limiter is arranged on the downstream side of transmission of the first inter-stock transmission mechanism and transmission of the second inter-stock transmission mechanism. It is characterized by being deployed upstream .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a passenger rice transplanter, which is mounted via an engine 2 mounted on the front of the body, a transmission case 3 for inputting engine power, and a front axle case 4. A pair of left and right front wheels 5 and a pair of left and right rear wheels 7 attached via a rear axle case 6. Engine power is input to the transmission case 3 via a belt-type or hydraulic-type continuously variable transmission mechanism 8. The transmission mechanism in the transmission case 3 changes the input engine power and transmits it to the front axle case 4, the rear axle case 6 and the planting PTO shaft 9.
[0008]
A planting work part 11 is connected to the rear part of the traveling machine body 1 via a lifting link mechanism 10. The planting work part 11 includes a work part frame 12 connected to the lift link mechanism 10 so as to be able to roll left and right, a seedling stage 13 provided above the work part frame 12 so as to be able to reciprocate left and right, and the work part. An input case (not shown) attached to the left and right intermediate portion of the frame 12 and a plurality of attachments attached to the working unit frame 12 at predetermined intervals in the left and right direction and extending rearward from the working unit frame 12 Planting transmission case 14, a planting mechanism 15 provided at the rear end of the planting transmission case 14, and a float 16 provided below the planting transmission case 14 so as to be swingable up and down. Yes.
[0009]
The input case receives planting power from the planting PTO shaft 9 of the mission case 3, and transmits this planting power to each planting transmission case 14 via a planting transmission shaft (not shown). Further, the planting power transmitted to the planting transmission case 14 is transmitted to the planting mechanism 15 via a chain transmission mechanism (not shown) in the planting transmission case 14.
[0010]
The planting mechanism 15 includes a rotating case 17 that rotates with the planting power and a pair of planting claw support cases 18 provided at both ends thereof. The posture of the planting claw support case 18 is controlled by a gear train (not shown) housed in the rotating case 17 so that the planting claw 19 provided at the tip portion draws a predetermined locus. That is, when the rotating case 17 rotates, the planting claw 19 scrapes off the seedling from the lower end of the seedling stage 13 and then reaches the planting position in the soil while drawing an arc that swells forward, and then linearly It is configured to draw a half-moon-like stationary trajectory that rises (tip motion trajectory when traveling is stopped). Thereby, planting is performed twice each time the rotating case 17 rotates once.
[0011]
The planting operation speed of the planting mechanism 15 is linked to the vehicle speed, and the planting stock of the planting mechanism 15 is adjusted by changing the planting operation speed relative to the vehicle speed.
Further, the planting claw trajectory during planting traveling of the planting mechanism 15 is such that if the planting operation speed with respect to the vehicle speed is slowed to widen the planting stock, the amount of forward movement of the planting claw 19 with the progress of the aircraft will be in the ground. It grows and the planted seedling is dragged. Therefore, when expanding between planting stocks, by changing the planting operation speed in one cycle at a non-uniform speed without changing the stationary trajectory of the planting mechanism 15, the operation speed of the planting claw 19 in the soil It is necessary to increase the speed to prevent the seedling from being dragged. Hereinafter, a configuration for that purpose will be described.
[0012]
The transmission case 3 transmits power input to the input shaft 20 to a cylindrical shaft 21 rotatably supported by the input shaft 20, an intermediate transmission shaft 22 parallel to the cylindrical shaft 21, and the intermediate transmission shaft 22. The planted PTO shaft 9 is connected to the planted PTO shaft 9 via a parallel-to-stock transmission shaft 23, a cylindrical shaft 24 rotatably supported by the inter-stock transmission shaft 23, and a cylindrical shaft 25 rotatably supported by the cylindrical shaft 24. It is configured to transmit.
[0013]
A main clutch mechanism 26 is configured between the input shaft 20 and the cylindrical shaft 21, and traveling power and planting power are intermittently connected according to the turning-on / off operation. A gear shaft 27 for extracting traveling power and a gear 28 for extracting planting power are integrally provided on the cylinder shaft 21 on the lower transmission side of the main clutch mechanism 26, and the transmission gear 28 is always meshed. Planting power is transmitted to the intermediate transmission shaft 22 via the gear 29.
[0014]
A first inter-shaft transmission mechanism 30 is configured between the intermediate transmission shaft 22 and the transmission upper end of the inter-shaft transmission shaft 23. The first inter-strain transmission mechanism 30 includes two gears 31 and 32 that are integrally provided on the intermediate transmission shaft 22 and a transmission gear 33 that is spline-fitted to the inter-strain transmission shaft 23. The transmission gear 33 has three gear portions 33a, 33b, and 33c, and each gear portion 33a, 33b, and 33c selectively meshes with the two gears 31 and 32, so that a three-stage stock shift can be performed. It is possible.
[0015]
A torque limiter 34 is provided between the lower transmission end of the inter-stock transmission shaft 23 and the upper transmission end of the cylindrical shaft 24. Here, the planting power transmitted to the torque limiter 34 is constant speed rotation. As a result, the operating load of the torque limiter 34 becomes constant, and a stable limit operation is possible.
[0016]
A transmission gear 36 that constitutes a second inter-stock transmission mechanism 35 is spline-fitted to an end portion on the lower transmission side of the cylindrical shaft 24. The speed change gear 36 is operated to be shifted to a position where it engages with a gear 37 that is rotatably supported by the intermediate transmission shaft 22 and a position where the side meshing teeth 36 a mesh with the meshing teeth 25 a of the cylindrical shaft 25. Yes. In a state where the meshing teeth 36a of the transmission gear 36 are engaged with the meshing teeth 25a of the cylindrical shaft 25, the rotation of the cylindrical shaft 24 is transmitted to the cylindrical shaft 25 without being shifted, while the transmission gear 36 is engaged with the gear 37. Then, the planting power is changed according to the gear ratio. As a result, the six-stage inter-stock adjustment can be performed by combining the two-stage shift by the second inter-company transmission mechanism 35 and the three-stage transmission by the first inter-company transmission mechanism 30.
[0017]
The gear 37 is integrally provided with an eccentric gear 39 constituting an inconstant speed transmission mechanism 38. The eccentric gear 39 is always meshed with an eccentric gear 40 provided integrally with the cylindrical shaft 25. That is, when the gears 36 and 37 of the second inter-strain transmission mechanism 35 are engaged with each other, the power of the cylindrical shaft 24 is transmitted to the cylindrical shaft 25 via the unequal speed transmission mechanism 38. As a result, not only can the planting power be switched between constant speed and unequal speed, but the above-described switching between constant speed and unequal speed is performed using the speed change gear 36 of the second inter-strain transmission mechanism 35 as a rotational speed change mechanism. It becomes possible.
[0018]
The cylindrical shaft 25 transmits planting power from the lower end of the transmission to the planting PTO shaft 9 through bevel gears B1 and B2. The bevel gear B <b> 2 on the planting PTO shaft 9 side is rotatably provided on the planting PTO shaft 9 and is connected to the planting PTO shaft 9 via a planting clutch mechanism 41. The planting clutch mechanism 41 is a meshing clutch in which the meshing position is limited to only one position. Even if the planting power is interrupted on the lower transmission side of the non-uniform speed transmission mechanism 38, the non-uniform speed transmission mechanism 38 is increased. There is no deviation in the speed position.
[0019]
Further, the transmission case 3 slidably supports a first shifter shaft 42 for shifting the first stock shift mechanism 30 and a second shifter shaft 43 for shifting the second stock shift mechanism 35. ing. A shifter fork 44 that engages with the transmission gear 33 is provided at the inner end of the first shifter shaft 42, and a first inter-stock shift lever 45 is linked to the outer end. The operation position of the first inter-stock shift lever 45 is defined by the first detent mechanism 46, and the three-stage inter-stock shift described above is possible. Also, a shifter fork 47 that engages with the transmission gear 36 is provided at the inner end of the second shifter shaft 43, and a second inter-group transmission lever 48 is linked to the outer end. The operation position of the second stock shift lever 48 is defined by the second detent mechanism 49, and the two-stage stock shift described above is possible. In the second inter-gear transmission mechanism 35, as described above, the constant-speed / unequal speed rotation switching is performed together with the inter-gear shift, so that the second inter-gear speed change lever 48 is equal to the inter-gear speed change operation tool. It is also used as a fast rotation switching operation tool.
[0020]
As described above, the six stages of stocks (K1 to K6) that can be adjusted by the combination of the first stock transmission mechanism 30 and the second stock transmission mechanism 35 are Kl <K2 <K3 <K4 <K5 <K6. These six stages of stock (Kl to K6) appear when the first stock shift lever 45 and the second stock shift lever 48 are operated to the following positions.
Kl: First stock shift lever (small), second stock shift lever (small)
K2: First stock shift lever (middle), second stock shift lever (small)
K3: Shift lever between the first stock (large), shift lever between the second stock (small)
K4: First stock shift lever (small), second stock shift lever (large)
K5: First stock shift lever (middle), second stock shift lever (large)
K6: First stock shift lever (large), second stock shift lever (large)
[0021]
That is, the shifting from the small stock side of K1 to K3 to the wide stock side of K4 to K6 is performed by the shifting operation from the (small) to the (large) stock side of the second stock shifting lever 48, and accordingly, The attached power is also switched from the constant speed transmission path to the inconstant speed transmission path, and the rotation of the planting mechanism 15 is switched from the constant speed rotation to the inconstant speed rotation.
[0022]
The rice transplanter configured as described above has a planting mechanism 15 that scrapes seedlings from the seedling platform 13 and transplants them into the enclosure, and an inter-strain shift that shifts the relative operating speed of the planting mechanism 15 with respect to the vehicle speed in multiple stages. The mechanisms 30 and 35 and the non-constant speed transmission mechanism 38 that changes the planting operation speed in one cycle of the planting mechanism 15 at a non-uniform speed, and the non-uniform speed transmission via the non-uniform speed transmission mechanism 38. The path (cylinder shaft 24 → transmission gear 36 → gear 37 → inconstant speed transmission mechanism 38 → cylinder shaft 25) and the constant speed transmission path (cylinder shaft 24 → transmission gear 36 → cylinder shaft) without passing through the inconstant speed transmission mechanism 38 25), and the switching between the inconstant speed transmission path and the constant speed transmission path can be performed by the transmission gear 36 of the second inter-group transmission mechanism 35. That is, by using the transmission gear 36 of the second inter-company transmission mechanism 35 as a rotational transmission mechanism, not only can the number of parts be reduced and the cost can be reduced, but also the second inter-organization transmission mechanism 35 and the inconstant speed conversion mechanism 38. Can be configured compactly.
[0023]
In addition, when the second inter-strain transmission mechanism 35 is shifted to the small plant (K1 to K3) side where the rotational speed of the planting mechanism 15 is high and the driving load is large, the planting power is automatically reduced in load fluctuations, etc. The planting mechanism 15 is rotated at a constant speed by switching to the high-speed transmission path, so that the operation speed in the soil during planting traveling of the planting mechanism 15 is not unnecessarily increased, and vibration due to load fluctuations is further prevented. Can also be reduced.
On the other hand, when the second inter-strain shifting mechanism 35 is shifted to the wide stock (K4 to K6) side where the rotational speed of the planting mechanism 15 is low and the driving load is small, the planting power is automatically transmitted at an unequal speed. By switching to the path, the planting mechanism 15 rotates at a non-uniform speed, so that the operation speed during one planting cycle can be changed at a non-uniform speed without changing the stationary trajectory of the planting mechanism 15. If one planting cycle is configured so that the operation speed of the planting claws in the soil during planting travel is increased, dragging of seedlings between broad stocks can be prevented.
Further, since the switching between the constant speed and the non-constant speed is automatically performed by the speed change operation of the second inter-strain transmission mechanism 35, not only the speed change operation can be simplified, but also the constant speed / the non-uniform speed switching not suitable between the stocks. Is never done.
[0024]
【The invention's effect】
As described above, according to the present invention, in the transplanting machine including the planting mechanism 15 that scrapes the seedling from the seedling mount 13 and transplants the seedling into the field, the power transmission path for transmitting power from the engine 2 to the planting mechanism 15 To deploy the inter-strain shifting mechanism 30, 35 for shifting the planting driving speed with respect to the traveling speed to a plurality of stages,
A second inter-gear transmission mechanism 35 that makes the inter-gear transmission mechanism 30 , 35 appear on the downstream side of transmission of the first inter-gear transmission mechanism 30 that performs multi-stage transmission by constant speed gear transmission. Are arranged in a serial transmission state, the gear positions of the first inter-stock transmission mechanism 30 and the second inter-mechanism transmission mechanism 35 can be selected selectively , and the second inter-stock transmission mechanism 35 is shifted to the small stock side. It is configured to switch to constant speed transmission with the operation, and to switch to non-constant speed transmission with the speed change operation to the wide stock side, and the torque limiter 34 on the downstream side of the transmission of the first stock transmission mechanism 35, In addition, the planting power is provided on the transmission upstream side of the second inter-strain transmission mechanism 35, and the planting power is transmitted through the non-constant speed transmission path by the shifting operation toward the wide stock (K4 to K6) side. Since the planting mechanism 15 rotates at a non-uniform speed, Since the operation speed during one planting cycle can be changed at a non-uniform speed without changing the planting trajectory, the planting cycle is set so that the planting claw movement speed in the soil during planting is faster. If constituted, seedling dragging at a plurality of stages between broad stocks can be prevented.
On the other hand, the planting power is transmitted to the planting mechanism 15 through the constant speed transmission path by the shifting operation to the plantar (K1 to K3) side, and the planting mechanism 15 rotates at a constant speed. In a plurality of stages, the operation speed in the soil during planting is not increased unnecessarily, and stable planting becomes possible.
Further, since the switching between the constant speed and the non-constant speed is simultaneously performed by the speed change operation of the inter-gear speed change mechanism 30, 35, not only the speed change operation can be simplified, but also the planting mechanism 15 suitable for the time between the stocks is driven.
Furthermore, the transmission path of the planting power automatically becomes a constant speed transmission path with little load fluctuation by the shifting operation to the small plant (K1 to K3) side where the rotational speed of the planting mechanism 15 is relatively high and the driving load is large. Therefore, the vibration due to the load fluctuation can be reduced as compared with the case where the planting mechanism 15 rotates at a non-uniform speed at high speed.
[Brief description of the drawings]
FIG. 1 is a side view of a riding rice transplanter.
FIG. 2 is a plan view of the same.
FIG. 3 is a side view showing an engine and a transmission case.
FIG. 4 is a development view of a mission case.
FIG. 5 is a development view showing a planting power transmission system.
FIG. 6 is a development view showing an inter-stock transmission mechanism and an inconstant speed transmission mechanism.
FIG. 7 is a development view showing an operation system of a second inter-stock shift mechanism.
[Explanation of symbols]
2 Engine 13 Seedling stand 15 Planting mechanism 30 Stock change mechanism (first stock change mechanism)
35 Inter-strain transmission mechanism
36 Rotational transmission mechanism

Claims (1)

In a transplanter equipped with a planting mechanism (15) that scrapes seedlings from a seedling mount (13) and transplants them into a field, in a transmission path that transmits power from the engine (2) to the planting mechanism (15). To deploy the inter-strain shifting mechanism (30, 35) that shifts the planting driving speed relative to the traveling speed in multiple stages
The second inter-gear transmission mechanism (30 , 35) has a second lowest speed that is caused by non-constant speed gear transmission on the downstream side of transmission of the first inter-gear transmission mechanism (30) that performs multi-stage shifting by constant speed gear transmission. The inter-gear transmission mechanism (35) is arranged in a serial transmission state, and the gear positions of the first inter-gear transmission mechanism (30) and the second inter-gear transmission mechanism (35) can be selectively selected. The speed change mechanism (35) is configured to switch to constant speed transmission in accordance with the shifting operation toward the small stock side, and to be switched to non-constant speed transmission in accordance with the speed shifting operation toward the wide stock side, and the torque limiter (34). Is disposed downstream of the first inter-strain transmission mechanism (35) and upstream of the second inter-strain transmission mechanism (35) .

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