JP4376154B2 - Transplanter - Google Patents

Description

  The present invention relates to a transplanter provided with an inconstant speed conversion mechanism that changes a planting operation speed in one cycle without changing a planting cycle of the planting mechanism.

  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, by changing the planting operation speed during one cycle without changing the planting cycle of the planting mechanism, it is possible to increase the operation speed of the planting claws in the soil and prevent the seedling from being dragged. It has been proposed (see Patent Document 1). For example, in the rice transplanter shown in Patent Document 1, an inconstant speed transmission path that passes through the inconstant speed conversion mechanism and a constant speed transmission path that does not pass through the inconstant speed conversion mechanism are configured. Since switching to a constant speed transmission path is possible, it is possible to operate the planting mechanism at an unequal speed only when the space between the strains is widened.
JP 2003-219712 A

  However, in the thing of the said patent document 1, since a stock transmission mechanism and a constant speed / inconstant speed switching mechanism are comprised independently, not only an apparatus will enlarge, but a number of parts will also increase and cost will increase. There is inconvenience to invite up. In addition, since the inter-strain transmission mechanism and the constant speed / unconstant speed switching mechanism are switched by separate operating tools, not only the operation becomes complicated, but also the constant speed / unconstant speed switching which is not suitable between the stocks is performed. there is a possibility.

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. A mechanism for shifting the relative operating speed of the planting mechanism with respect to the vehicle speed, and a planting speed of the planting mechanism without changing the planting period of the planting mechanism. In the transplanter equipped with a constant speed conversion mechanism, an inconstant speed transmission path that passes through the inconstant speed conversion mechanism and a constant speed transmission path that does not pass through the inconstant speed conversion mechanism, and an inconstant speed transmission The switching between the path and the constant speed transmission path is performed by the shift gear of the inter-stock transmission mechanism, and the inter-stock transmission mechanism is further divided into an upstream inter-stock transmission mechanism that performs large- and small- two-stage constant-speed inter-stock transmission, and the upstream inter-stock transmission mechanism. Downstream of the transmission mechanism, the number of shift stages is higher than that of the upstream inter-company transmission mechanism Many are set, one step is carried out non-uniform speed for performing them greatest deceleration, remaining stages is constituted by the downstream strains transmission mechanism for constant speed shift, with respect to non-uniform speed position of the downstream strains transmission mechanism, By shifting the upstream inter-shaft transmission mechanism to large or small, the large inter-stock transmission is transmitted to the planting mechanism at a non-uniform speed between the two large stocks, and the upstream inter-shaft transmission mechanism is made large for each remaining stage of the downstream inter-shaft transmission mechanism. The transplanter is characterized in that the upstream inter-strain shifting mechanism and the downstream inter-strain shifting mechanism are configured so that the remaining strains are transmitted to the planting mechanism at a constant speed by shifting to a small speed . If comprised in this way, the speed change gear of a stock transmission mechanism can be combined with a constant speed / inconstant speed switching mechanism, and a number of parts can be reduced. In addition, switching between constant speed and unequal speed is automatically performed according to the shifting operation between stocks, so that not only can the operation be simplified, but also the constant speed / It is possible to avoid the inconvenience of switching at unequal speed. Moreover, since the number of shift stages of the downstream inter-gear transmission mechanism that performs constant speed / non-uniform speed switching is greater than the number of shift stages of the upstream inter-gear transmission mechanism, the number of stocks where the inconstant speed conversion is performed is minimized, The planting claw trajectory between the stocks can be optimized.
The invention according to claim 2 is characterized in that the downstream inter-gear transmission mechanism shifts by selection of meshing by movement of a single transmission gear, and includes a path for performing one-stage non-uniform speed change and a constant speed of the remaining stages. 2. The transplanter according to claim 1, wherein the path for shifting is configured using a double shaft. If comprised in this way, it will become possible to increase the number of speed steps, avoiding the enlargement of the downstream stock | shift transmission mechanism.
According to a third aspect of the present invention, a reduction gear is provided downstream of the torque limiter provided downstream of the upstream inter-strain transmission mechanism and upstream of the downstream inter-strain transmission mechanism, and the reduction gear is connected to a gear of the downstream inter-strain transmission mechanism. The transplanter according to claim 1 or 2, wherein the transplanter is arranged on the same axis. With such a configuration, not only can the torque of the torque limiter be cut off, but also an increase in the number of axes can be avoided without disturbing the timing of the inconstant speed conversion mechanism.

  Next, embodiments 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 are provided. Engine power is input to the transmission case 3 via the continuously variable transmission mechanism 8, and is transmitted to the front axle case 4, the rear axle case 6 and the planting PTO shaft 9 from here.

  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) that is attached to the left and right intermediate parts of the two parts, and a plurality of plantings that are attached to the working part frame 12 at predetermined intervals in the left-right direction and extend rearward from the working part frame 12 A transmission case 14, a planting mechanism 15 provided at the rear end of the planting transmission case 14, and a float 16 provided at the bottom of the planting work unit 11 are configured.

  The input case inputs 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 15a that rotates with the planting power and a pair of planting claw support cases 15b provided at both ends thereof. The posture of the planting claw support case 15b is controlled by a gear train (not shown) housed in the rotary case 15a so that the planting claw 19 provided at the tip portion draws a predetermined locus. That is, when the rotating case 15a rotates, the planting claw 19 scrapes off the seedling from the lower end of the seedling stage 13, and then reaches a planting position in the soil while drawing an arc that swells forward, and then linearly It is configured to draw a semi-moon-like stationary trajectory that rises (tip motion trajectory when traveling is stopped). Thereby, planting is performed twice each time the rotating case 15a rotates once.

  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 with reference to the standard stock, and if the planting operation speed is slowed to widen the planting stock, the amount of forward movement of the planting claw 19 as the aircraft progresses is increased. It grows in the soil and the planted seedlings are dragged. Therefore, when expanding between planting stocks, by changing the planting operation speed in one cycle without changing the planting cycle of the planting mechanism 15, the soil operation speed of the planting claw 19 is increased. It is necessary to increase the speed and prevent the seedling from being dragged. Hereinafter, a configuration for that purpose will be described.

  The transmission case 3 receives power input to the input shaft 20 from a cylindrical shaft 21 that is rotatably supported by the input shaft 20, an intermediate transmission shaft 22 that is 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.

  A main clutch mechanism 26 is configured between the input shaft 20 and the cylinder shaft 21, and traveling power and planting power are intermittently connected according to the on / off operation. A gear shaft 27 that extracts traveling power and a gear 28 that extracts planting power are integrally provided on the cylindrical shaft 21 that is downstream of the transmission of the main clutch mechanism 26, and the planting transmission gear 28 is always meshed. Planting power is transmitted to the intermediate transmission shaft 22 via the gear 29.

Between the intermediate transmission shaft 22 and the left end portion of the inter-shaft transmission shaft 23, a first inter-shaft transmission mechanism (upstream inter-shaft transmission mechanism) 30 is configured. The first stock transmission mechanism 30 includes two gears 31 and 32 provided integrally with the intermediate transmission shaft 22 and a transmission gear 33 that is spline-fitted to the stock transmission shaft 23. The transmission gear 33 has two gear portions 33a and 33b, and each gear portion 33a and 33b selectively meshes with the two gears 31 and 32, thereby enabling a constant-speed two-stage stock shift. ing.

A torque limiter 34 and a reduction gear mechanism 35 are sequentially disposed between the right end portions of the inter-shaft transmission shaft 23 and the cylinder shaft 24 so as to be positioned downstream of the first inter-shaft transmission mechanism 30 . The reduction gear mechanism 35 includes a gear 36 disposed on the inter-shaft transmission shaft 23 and a gear 37 disposed on the intermediate transmission shaft 22, and the planting power decelerated via these is transmitted to the right end of the cylindrical shaft 24. Transmitted to the club.

  A transmission gear 39 constituting a second inter-stock transmission mechanism (downstream inter-stock transmission mechanism) 38 is spline-fitted to the left end portion of the cylindrical shaft 24. The transmission gear 39 has a first position (large between stocks) that meshes with the gear 40 on the intermediate transmission shaft 22, a second position (medium between stocks) that meshes with the gear 41 on the intermediate transmission shaft 22, and meshing teeth on the side surface The gear shift operation is performed to the third position (small between stocks) 39a meshes with the meshing teeth 25a of the cylindrical shaft 25. In a state in which the meshing teeth 39a of the transmission gear 39 are meshed with the meshing teeth 25a of the cylindrical shaft 25, the rotation of the cylindrical shaft 24 is transmitted as it is to the cylindrical shaft 25 without being shifted, while the transmission gear 39 is gears 40, 41. In the state of meshing, the planting power is changed by the gear ratio. As a result, by combining the three-stage shift by the second inter-company transmission mechanism 38 and the two-stage transmission by the first inter-company transmission mechanism 30, it is possible to perform six-stage inter-stock adjustment.

The gear 40 is integrally provided with an eccentric gear 43 constituting the unequal speed conversion mechanism 42 on the most downstream side . The eccentric gear 43 is always meshed with an eccentric gear 44 provided integrally with the cylindrical shaft 25. In other words, when the transmission gear 39 of the second inter-stock transmission mechanism 38 is engaged with the gear 40, the power of the cylindrical shaft 24 is transmitted to the cylindrical shaft 25 via the unequal speed conversion mechanism 42. This makes it possible not only to switch the planting power at a constant speed / unequally, but also to perform the constant speed / unequal switching using the transmission gear 39 of the second inter-stock transmission mechanism 38.

The gear 41 is integrally provided with a gear 46 that always meshes with the gear 45 on the cylinder shaft 25, and when the transmission gear 39 of the second inter-stock transmission mechanism 38 is meshed with the gear 41, the power of the cylinder shaft 24 is increased. It is transmitted to the cylinder shaft 25 without going through the unequal speed conversion mechanism 42. In other words, since the second inter-gear transmission mechanism 38 is set to have a larger number of gears than the first inter-gear transmission mechanism 30 and is configured to perform non-uniform speed conversion at the most downstream one of them, It is possible to optimize the planting claw trajectory between each strain by setting the interval between the strains where constant speed conversion is performed to two steps as much as possible.

For example, in the present embodiment, as shown below, a combination of the first inter-stock transmission mechanism 30 and the second inter-mechanism transmission mechanism 38, six stages of inter-stock stock K1 to K6 (K1 <K2 <K3 <K4 <K5 <K6). the made to appear, perform non-uniform conversion of which strains K5 end two stages between strains is larger side, K6, the remaining strains small side K1~K4 is intends rows constant speed conversion.
K1: First inter-strain transmission mechanism (small), second inter-strain transmission mechanism (small)
K2: First stock shift mechanism (large), second stock shift mechanism (small)
K3: First inter-strain transmission mechanism (small), second inter-strain transmission mechanism (middle)
K4: First inter-shaft transmission mechanism (large), second inter-shaft transmission mechanism (medium)
K5: First stock shift mechanism (small), second stock shift mechanism (large)
K6: First stock shift mechanism (large), second stock shift mechanism (large)

The second inter-strain transmission mechanism 38 of the present embodiment is configured using a double shaft as shown in the figure . Specifically, the gear 40 is supported on the outer periphery of the intermediate transmission shaft 22, and the gear 41 is supported on the outer periphery of a cylindrical portion 40 a formed on the gear 40. This makes it possible to increase the number of shift stages while avoiding an increase in the size of the second inter-stock transmission mechanism 38.

Further, in the present embodiment, when the above-described reduction gear mechanism 35 is provided upstream of the second stock transmission mechanism 38 and downstream of the torque limiter 34, the gear 37 constituting the reduction gear mechanism 35 is replaced with the second stock transmission mechanism 38. Since the gears 40 and 41 are arranged coaxially with each other, the breaking torque of the torque limiter 34 can be reduced and the increase in the number of shafts can be avoided without disturbing the timing of the inconstant speed conversion mechanism 42.
The power transmitted to the cylinder shaft 25 is output from the planting PTO shaft 9 via the bevel gear mechanism 47 and the planting clutch mechanism 48.

  The riding rice transplanter of the present embodiment configured as described shifts the relative operating speed of the planting mechanism 15 that scrapes seedlings from the seedling mount 13 and transplants them into the field, and the planting mechanism 15 with respect to the vehicle speed. The inter-strain transmission mechanisms 30 and 38 and the non-constant speed conversion mechanism 42 that changes the planting operation speed in one cycle without changing the planting period of the planting mechanism 15 are provided. 42, and a constant speed transmission path that does not pass through the non-constant speed conversion mechanism 42, and switching between the non-constant speed transmission path and the constant speed transmission path is performed by Further, the inter-gear transmission mechanism 30, 38 is operated by the transmission gear 39, and the first inter-gear transmission mechanism 30 that performs only inter-gear transmission, and the second inter-gear transmission mechanism 38 that performs inter-gear transmission and constant speed / unequal speed switching downstream thereof. And a change in the second inter-strain transmission mechanism 38. The number of stages, are then more than speed step number of the first strains transmission mechanism 30. As a result, the transmission gear of the inter-company transmission mechanism 38 can also be used as a constant speed / non-constant speed switching mechanism, and the number of parts can be reduced. In addition, switching between constant speed and unequal speed is automatically performed according to the shifting operation between stocks, so that not only can the operation be simplified, but also the constant speed / It is possible to avoid the inconvenience of switching at unequal speed. In addition, by increasing the number of gears of the second inter-gear transmission mechanism 38 to be larger than the number of gears of the first inter-mechanism transmission mechanism 30, the number of strains in which the non-uniform speed conversion is performed is minimized, and the planting claw trajectory between the stocks is changed. Can be optimized.

  Further, since the second inter-strain transmission mechanism 38 is configured using multiple shafts, it is possible to increase the number of shift stages while avoiding an increase in the size of the second inter-strain transmission mechanism 38.

  Further, a reduction gear mechanism 35 is provided upstream of the second stock transmission mechanism 38 and downstream of the torque limiter 34, and the gear 37 of the reduction gear mechanism 35 is coaxial with the gears 40 and 41 of the second stock transmission mechanism 38. Since it is arranged above, not only can the torque of the torque limiter 34 be reduced, but also an increase in the number of shafts can be avoided without changing the timing of the inconstant speed conversion mechanism 42.

It is a side view of a riding rice transplanter. It is an expanded view of a mission case. It is a principal part expanded view which shows a planting motive power transmission system. It is a transmission circuit diagram which shows the whole power transmission system of a riding rice transplanter. It is a power transmission circuit diagram which shows a planting power transmission system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traveling machine body 3 Mission case 11 Planting operation part 13 Seedling stand 15 Planting mechanism 22 Intermediate transmission shaft 23 Inter-shaft transmission shaft 24 Cylindrical shaft 25 Cylindrical shaft 30 First inter-shaft transmission mechanism 34 Torque limiter 35 Reduction gear mechanism 38 Inter-second stock Transmission mechanism 42 Unequal speed conversion mechanism

Claims (3)

A planting mechanism for scraping seedlings from a seedling stage and transplanting the seedlings on a field, an inter-strain transmission mechanism for shifting the relative operating speed of the planting mechanism with respect to the vehicle speed, and without changing the planting cycle of the planting mechanism , In a transplanter including an inconstant speed conversion mechanism that causes a change in planting operation speed during one cycle, through an inconstant speed transmission path through the inconstant speed conversion mechanism, and through the inconstant speed conversion mechanism together constitute a city like speed transmission path, the switching between the non-uniform speed transmission path and a constant velocity transmission path, performed by the speed change gear of the strains transmission mechanism, further, the strains transmission mechanism, large and small two-stage The upstream inter-gear transmission mechanism that performs constant-speed inter-gear shifting, and the upstream inter-gear transmission mechanism are set to have a larger number of gears than the upstream inter-gear transmission mechanism, and one of the speeds that performs the greatest deceleration performs non- uniform speed shifting and the remaining in downstream strains transmission mechanism of the stage to perform the constant speed gear shift And by shifting the upstream inter-strain transmission mechanism to large and small relative to the non-constant speed shift stage of the downstream inter-strain transmission mechanism, the two large stocks are transmitted to the planting mechanism at non-uniform speed, and between the downstream stocks For each remaining stage of the transmission mechanism, the upstream inter-strain transmission mechanism and the downstream inter-strain transmission mechanism are transmitted to the planting mechanism at a constant speed by shifting the upstream inter-strain transmission mechanism to large or small. A transplanter characterized by comprising. The downstream inter-strain transmission mechanism shifts according to the selection of meshing by the movement of a single transmission gear, and there are two paths for performing one-stage inconstant speed shift and the remaining paths for performing constant-speed shift. The transplanter according to claim 1, wherein the transplanter is configured using a heavy shaft.   A reduction gear is provided downstream of the torque limiter provided downstream of the upstream inter-unit transmission mechanism and upstream of the downstream inter-unit transmission mechanism, and the reduction gear is disposed coaxially with the gear of the downstream inter-unit transmission mechanism. The transplanter according to claim 1 or 2, characterized in that

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