JP4271561B2 - Transplanter - Google Patents

Description

  The present invention includes a torque limiter for entering / cutting planting power according to the load of the planting mechanism on the planting power transmission path in the mission case, and without changing the planting cycle of the planting mechanism. The present invention relates to a transplanter such as a rice transplanter provided with an inconstant speed conversion mechanism that causes a change in the planting operation speed of the plant.

  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.

Therefore, a transplanter in which an inconstant speed conversion mechanism is interposed in a planting power transmission path has been proposed (see, for example, Patent Document 1). The transplanter configured in this way can change the planting operation speed during one cycle without changing the planting cycle of the planting mechanism. Thus, the seedling can be prevented from being dragged.
JP 2002-78406 A

  By the way, in the transplanter as described above, when the torque limiter is provided in the planting power transmission path, in order to prevent a phase shift in the acceleration / deceleration region due to the inconstant speed conversion mechanism, on the transmission upper side of the inconstant speed conversion mechanism. It is required to provide a torque limiter. However, as shown in Patent Document 1, when a torque limiter is directly connected to the transmission upper side of the inconstant speed conversion mechanism, the torque acting on the torque limiter increases, so the torque of the torque limiter is set accurately. Not only is it difficult to do this, but there is a problem in that the claw life of the torque limiter is shortened.

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a planting in which seedlings are scraped from a seedling stage and transplanted to a field. And a transmission case equipped with a transmission mechanism for supplying planting power to the planting mechanism, and planting the planting power transmission path in the mission case according to the load of the planting mechanism A transplanter comprising: a torque limiter for turning on / off power; and an inconstant speed conversion mechanism for changing a planting operation speed in one cycle without changing a planting cycle of the planting mechanism. The attached power transmission path includes the inconstant speed conversion mechanism on the lower transmission side of the torque limiter, and the reduction mechanism on the lower transmission side of the torque limiter and on the upper transmission side of the inconstant speed conversion mechanism. In configuring In the transmission case, a triple shaft composed of an inner shaft, an intermediate shaft, and an outer shaft is formed, the torque limiter is formed between the inner shaft and the intermediate shaft, and the intermediate shaft and the outer shaft The transplanter is characterized in that the speed reduction mechanism is formed between adjacent shafts, and the inconstant speed conversion mechanism is formed between the outer shaft and the adjacent shaft . If it does in this way, it will become possible to suppress the load which acts on a torque limiter low, without producing phase shift in the speed increasing / decreasing area of the planting mechanism by an inconstant speed conversion mechanism. Thereby, not only can the cutting operation torque of the torque limiter be accurately set, but also the claw life of the torque limiter can be extended. Moreover, since the torque limiter, the inconstant speed conversion mechanism, and the speed reduction mechanism can be arranged on the same axis, the transmission case can be reduced in size.
The invention according to claim 2 is the transplanter according to claim 1, wherein a gear constituting the speed reduction mechanism is arranged coaxially with the inconstant speed conversion mechanism. If it does in this way, it will become possible to interpose a deceleration mechanism between a torque limiter and an inconstant speed conversion mechanism, without enlarging a mission case.
A third aspect of the present invention is the transplanter according to the first or second aspect, wherein a gear constituting the speed reduction mechanism is arranged coaxially with the torque limiter. If it does in this way, it will become possible to interpose a deceleration mechanism between a torque limiter and an inconstant speed conversion mechanism, without enlarging a mission case.

  Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a traveling machine body of a riding rice transplanter, and the traveling machine body 1 is supported by an engine 2 mounted on the front part of the machine body, a transmission case 3 for shifting engine power, and a front axle case 4. And a pair of left and right rear wheels 7 supported by a rear axle case 6. Engine power is input to the transmission case 3 via a hydraulic or belt type continuously variable transmission mechanism 8, and after being shifted here, is output to the front axle case 4, the rear axle case 6, and the planting PTO shaft 9.

  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 that is connected to the lifting link mechanism 10 so as to be able to roll, a seedling stage 13 provided on the work part frame 12 so as to be able to reciprocate left and right, and the work part frame 12. An input case (not shown) attached to the left and right intermediate portions of the two, a plurality of planting transmission cases 14 extending rearward from the working unit frame 12, and a planting provided at the rear end of the planting transmission case 14 An attachment mechanism 15 and a float 16 that is swingable up and down below the planting transmission case 14 are configured.

  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 the planting transmission shaft 17. Further, the planting power transmitted to the planting transmission case 14 is transmitted to the planting mechanism 15 via the chain transmission mechanism 18 in the planting transmission case 14.

  The planting mechanism 15 includes a rotating case 19 that rotates with the planting power and a pair of planting claw support cases 20 provided at both ends thereof. The posture of the planting claw support case 20 is controlled by a gear train housed in the rotary case 19 so that the planting claw 21 provided at the tip portion draws a predetermined locus. That is, when the rotating case 19 rotates, the planting claw 21 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 19 makes one rotation.

  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. In addition, the planting claw trajectory of the planting mechanism 15 is set based on the standard stock, and if the planting operation speed is slowed down so as to widen the planting stock, the amount of forward movement of the planting claw 21 as the aircraft advances is increased. Since it grows in the soil and the planted seedling is dragged, when expanding the planting stock, the planting operation speed during one cycle is changed without changing the planting cycle of the planting mechanism 15. Thus, it is required to increase the operation speed of the planting claws 21 in the soil and prevent the seedling from being dragged.

  The transmission case 3 includes an input shaft 22 that inputs power from the continuously variable transmission mechanism 8, a cylindrical shaft 23 that is rotatably supported by the input shaft 22, and a main shaft that is configured between the input shaft 22 and the cylindrical shaft 23. The clutch mechanism 24, the driving power transmission path 27 that shifts the power of the cylinder shaft 23 and transmits it to the front wheel power output shaft 25 and the rear wheel power output shaft 26, and the power of the cylinder shaft 23 are shifted and the planting PTO shaft 9 And a planting power transmission path 28 that transmits to the rear.

  In the planting power transmission path 28, an inter-plant transmission mechanism 29 that shifts planting power in accordance with the operation of the inter-plant transmission operating tool, and a torque limiter 30 that turns on / off planting power in accordance with the load of the planting mechanism 15. A speed reduction mechanism 31 that decelerates the planting power, a non-constant speed conversion mechanism 32 that changes the planting operation speed in one cycle without changing the planting cycle of the planting mechanism 15, and a planting clutch A planting clutch mechanism 33 for turning on / off planting power according to the operation of the operation tool is interposed.

  The speed reduction mechanism 31 is interposed on the lower transmission side of the torque limiter 30 and on the upper transmission side of the inconstant speed conversion mechanism 32, and is phased in the acceleration / deceleration region of the planting mechanism 15 by the inconstant speed conversion mechanism 32. The load acting on the torque limiter 30 is reduced without causing a deviation. Thereby, the cutting operation torque of the torque limiter 30 can be set with high accuracy, and the claw life of the torque limiter 30 can be extended. Hereinafter, the configuration of the planting power transmission path 28 will be specifically described.

  The planting power transmission path 28 is configured to transmit planting power to the planting PTO shaft 9 via the first to third transmission shafts 34 to 36. The second transmission shaft 35 is a triple shaft, and includes an inner shaft 37, an intermediate shaft 38 (cylinder shaft), and an outer shaft 39 (cylinder shaft). The inter-shaft transmission mechanism 29 is configured between the cylindrical shaft 23 and the first transmission shaft 34, and the movable gear 40 that is spline-fitted to the first transmission shaft 34 is fixed to the fixed gear 41 that is fixed to the cylindrical shaft 23. By selectively meshing, the planting power is changed. The planting power transmitted to the first transmission shaft 34 is transmitted to the inner shaft 37 of the second transmission shaft 35 via the gears 42 and 43.

  The torque limiter 30 is configured between an inner shaft 37 and an intermediate shaft 38 of the second transmission shaft 35. Specifically, the torque limiter 30 rotates integrally with the inner shaft 37 and is movable in the axial direction. A claw 44, a fixed claw 45 that rotates integrally with the intermediate shaft 38, and a bullet machine 46 that urges the movable claw 44 toward the fixed claw 45 are provided. The meshing surfaces of the movable claw 44 and the fixed claw 45 are inclined surfaces, and when a large load is applied to the fixed claw 45 side, the movable claw 44 slides against the bullet machine 46 in the separation direction. Thereby, the planting power to the planting mechanism 15 is cut off, and damage to the planting mechanism 15 due to overload is avoided. The receiving member 47 for receiving the base end of the bullet machine 46 is slidable in the axial direction with respect to the inner shaft 37, and the cutting operation torque of the torque limiter 30 is adjusted by defining the sliding position with the nut 48. Is done.

  The speed reduction mechanism 31 is configured via a third transmission shaft 36 between an intermediate shaft 38 and an outer shaft 39 of the second transmission shaft 35, and specifically, is integrally coupled to the intermediate shaft 38. Gear 49, a gear 50 that is rotatably supported by the third transmission shaft 36, meshes with the gear 49, a gear 51 that is integrated with the gear 50, and an outer shaft 39. The gear 52 which meshes is provided. The number of teeth of the gears 49 to 52 is defined so as to reduce the planting power, and accordingly, the torque that acts on the torque limiter 30 at the time of overload is reduced.

  The non-uniform speed conversion mechanism 32 is configured between the outer shaft 39 of the second transmission shaft 35 and the first transmission shaft 34, and specifically, a movable gear 53 that is spline-fitted to the outer shaft 39; A gear 54 rotatably supported by the first transmission shaft 34 and meshed with the movable gear 53, an eccentric gear 55 integrated with the gear, and an eccentric gear rotatably supported by the outer shaft 39 and meshed with the eccentric gear 55 56. The eccentric gears 55 and 56 have their meshing positions defined, and cause a predetermined speed change during one rotation of the planting power. Thereby, it becomes possible to cause a change in the planting operation speed in one cycle without changing the planting cycle of the planting mechanism 15.

  Further, meshing claws 53a and 56a are provided on the opposing surfaces of the movable gear 53 and the eccentric gear 56, respectively. When the engaging claws 53 a and 56 a are engaged by a sliding operation of the movable gear 53, the power of the movable gear 53 is directly transmitted to the eccentric gear 56 without passing through the gear 54 (deceleration gear) or the eccentric gear 55. As a result, the inconstant speed conversion mechanism 32 can be caused to function as a constant speed / inconstant speed switching mechanism or a second stock shifting mechanism. The planting power transmitted to the eccentric gear 56 is output from the planting PTO shaft 9 via the gear 57 and the planting clutch mechanism 33 provided on the third transmission shaft 36.

  In the configuration as described above, a mission case 3 is equipped with a planting mechanism 15 for scraping seedlings from the seedling mount 13 and transplanting them into a field, and a transmission mechanism for supplying planting power to the planting mechanism 15. A torque limiter 30 for turning on / off the planting power to the planting power transmission path 28 in the mission case 3 according to the load of the planting mechanism 15, and the planting cycle of the planting mechanism 15 In providing the non-constant speed conversion mechanism 32 that causes a change in the planting operation speed during one cycle without changing, the planting power transmission path 28 is provided on the lower transmission side of the torque limiter 30 with the non-constant speed conversion mechanism 32. And a speed reduction mechanism 31 on the lower transmission side of the torque limiter 30 and on the upper transmission side of the inconstant speed conversion mechanism 32, the phase is set in the speed increasing / decreasing region of the planting mechanism 15 by the inconstant speed conversion mechanism 32. It causes misalignment No, it is possible to reduce the load acting on the torque limiter 30. Thereby, not only can the cutting operation torque of the torque limiter 30 be set with high precision, but also the claw life of the torque limiter 30 can be extended.

  Since the gears 49 and 52 constituting the speed reduction mechanism 31 are arranged coaxially with the torque limiter 30 and the inconstant speed conversion mechanism 32, the torque limiter 30 and the inconstant speed are not increased without increasing the size of the transmission case 3. The speed reduction mechanism 31 can be interposed between the conversion mechanism 32 and the conversion mechanism 32.

  Further, a triple shaft (second transmission shaft 35) composed of an inner shaft 37, an intermediate shaft 38 and an outer shaft 39 is formed in the transmission case 3, and a torque limiter 30 is formed between the inner shaft 37 and the intermediate shaft 38. The speed reduction mechanism 31 is configured between the intermediate shaft 38 and the outer shaft 39 via the adjacent shaft (third transmission shaft 36), and further, the outer shaft 39 and the adjacent shaft (first transmission shaft 34) are connected to each other. Since the inconstant speed conversion mechanism 32 is formed therebetween, the torque limiter 30, the inconstant speed conversion mechanism 32, and the speed reduction mechanism 31 are configured on the same axis, and the mission case 3 can be reduced in size.

It is a side view of a riding rice transplanter. It is a transmission circuit diagram of a riding rice transplanter. It is a principal part expanded view of a mission case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 3 Mission case 9 Planting PTO axis | shaft 11 Planting work part 13 Seedling stand 15 Planting mechanism 28 Planting power transmission path 29 Stock transmission mechanism 30 Torque limiter 31 Deceleration mechanism 32 Inconstant speed conversion mechanism 34 First transmission Shaft 35 Second transmission shaft 36 Third transmission shaft 37 Inner shaft 38 Intermediate shaft 39 Outer shaft 55 Eccentric gear 56 Eccentric gear

Claims (3)

A planting mechanism for scraping seedlings from a seedling stage and transplanting the seedlings in a field; and a transmission case equipped with a transmission mechanism for supplying planting power to the planting mechanism, and planting power in the mission case A torque limiter that enters / cuts planting power according to the load of the planting mechanism in the transmission path, and changes in planting operation speed during one cycle without changing the planting cycle of the planting mechanism. In the transplanter including the inconstant speed conversion mechanism, the planting power transmission path includes the inconstant speed conversion mechanism on the lower transmission side of the torque limiter, and on the lower transmission side of the torque limiter, and In configuring the transmission case of the non-constant speed conversion mechanism to include a speed reduction mechanism, a triple shaft including an inner shaft, an intermediate shaft, and an outer shaft is formed in the transmission case, and the inner shaft and the intermediate shaft are configured. Before A torque limiter is configured, the speed reduction mechanism is configured via an adjacent shaft between the intermediate shaft and the outer shaft, and the non-uniform speed conversion mechanism is further configured between the outer shaft and the adjacent shaft. transplanter, characterized in that configuration was.   The transplanter according to claim 1, wherein a gear constituting the speed reduction mechanism is arranged coaxially with the inconstant speed conversion mechanism.   The transplanter according to claim 1 or 2, wherein a gear constituting the speed reduction mechanism is arranged coaxially with the torque limiter.

Images