JP4605657B2 - Ride type rice transplanter - Google Patents

Description

  The present invention relates to a riding type rice transplanter configured to supply liquid fertilizer to a rice field while planting seedlings.

  Some riding rice transplanters are configured to supply liquid fertilizer to the rice field while planting seedlings, as disclosed in Patent Document 1, for example. In patent document 1, the fertilizer tank (21, 31 of FIG. 1 and FIG. 8 of patent document 1) which stores liquid fertilizer, the fertilizer pump which pumps the liquid fertilizer of a fertilizer tank (23 of FIG. 8 of patent document 1) 33), and a fertilizer nozzle (22 and 32 in FIG. 1 of FIG. 1 and FIG. 8) for supplying liquid fertilizer from the fertilizer pump to the field surface.

  In Patent Document 1, the transmission shaft (75 and 7 in FIG. 5 of Patent Document 1) is extended from the transmission case (70 in FIG. 5 of Patent Document 1), and the transmission shaft is connected to the seedling planting device. The power of the engine (E in FIG. 8 of Patent Document 1) is transmitted from the transmission case to the seedling planting device via the transmission shaft. In this case, in Patent Document 1, the transmission system (81 in FIG. 5 of Patent Document 1) is branched from the transmission shaft (75 in FIG. 5 of Patent Document 1) and connected to the fertilizer pump. The transmitted power is branched and transmitted to the fertilizer pump, and the fertilizer pump is driven.

Japanese Patent Laid-Open No. 2002-233216 (FIGS. 1, 5, and 8)

  Some riding rice transplanters are equipped with a planting speed change mechanism so that the engine power is transmitted from the planting speed change mechanism to the seedling planting device via a transmission shaft. By shifting the power transmitted to the planting device, it is possible to change the seedling planting interval (the ratio of the planting speed of the seedling planting device to the working travel speed of the machine body) by the seedling planting device.

In the above-described riding-type rice transplanter, when the power branched from the transmission shaft to the seedling planting device is transmitted to the fertilizer pump, the power transmitted to the seedling planting device is shifted by the planting speed change mechanism. If the seedling planting interval by the seedling planting device is changed, the power transmitted to the fertilizer pump is also changed, and the amount of liquid fertilizer pumped from the fertilizer pump changes. On the other hand, with liquid fertilizers, a method is generally used in which the total amount of liquid fertilizer supplied to one paddy field becomes a set amount regardless of the seedling planting interval by the seedling planting device. Thus, when the power transmitted to the fertilizer pump is changed in accordance with the change of the seedling planting interval by the seedling planting device, the total amount of liquid fertilizer supplied to one paddy field changes.
The present invention is a riding type rice transplanter configured to supply liquid fertilizer to the rice field while planting seedlings, and the total amount of liquid fertilizer to be supplied to one paddy field is set while driving a fertilizer pump appropriately It is intended to be configured to be maintained in quantity.

(Constitution)
The first feature of the present invention resides in the following configuration in a riding type rice transplanter.
Transmitting the power of the engine to the transmission, branching the power of the transmission to the traveling transmission system to the front wheels and the rear wheels,
The power of the transmission is branched to a planting transmission system to a seedling planting device via a one-way transmission mechanism that transmits forward power to the lower side and interrupts reverse power. With a planting speed change mechanism between the direction transmission mechanism and the seedling planting device,
A fertilizer is provided in which a fertilizer tank for storing liquid fertilizer and a fertilizer pump for pumping liquid fertilizer in the fertilizer tank are arranged on the lateral side of the front part of the machine body, and the liquid fertilizer from the fertilizer pump is supplied to the rice field. With a nozzle,
The one-way transmission mechanism and the planting transmission mechanism in the planting transmission system are disposed inside a transmission case to which a front axle case is connected, and fertilizer is applied from a portion between the one-way transmission mechanism and the planting transmission mechanism. the transmission system is branched, a is a fertilization output shaft portion of the fertilization transmission system, to project laterally outward portion from the interior of the transmission case, constitutes the power of the fertilizer output shaft so as to transmit to the fertilizer pump ,
A reduction mechanism that decelerates and transmits power from a portion between the one-way transmission mechanism and the planting transmission mechanism in the planting transmission system to the fertilizer output shaft is provided inside the mission case,
The speed reduction mechanism is configured to transmit power to the fertilization output shaft from the smallest transmission gear among the plurality of transmission gears of the planting transmission mechanism .

(Function)
According to the first aspect of the present invention, engine power is transmitted to the transmission, and the power of the transmission is branched into a traveling transmission system to the front and rear wheels and a planting transmission system to the seedling planting device. The fertilization transmission system is branched from the portion between the one-way transmission mechanism and the planting transmission mechanism in the planting transmission system and connected to the fertilization pump. In this case, in addition to transmitting the power of the transmission to the traveling transmission system, the power synchronized with the power transmitted to the traveling transmission system is transmitted from the one-way transmission mechanism to the planting transmission mechanism in the planting transmission system. Then, the power shifted by the planting transmission mechanism is transmitted to the seedling planting device, and the planting interval of the seedlings by the seedling planting device is changed by the planting transmission mechanism.

  Thus, according to the first feature of the present invention, the power shifted by the planting transmission mechanism is not transmitted to the fertilizer pump, but the power synchronized with the power transmitted to the traveling transmission system is transmitted to the fertilizer pump. Will be. When power that synchronizes with the power transmitted to the traveling transmission system is transmitted to the fertilizer pump in this way, even if the power transmitted to the traveling transmission system is shifted by the transmission, the power transmitted to the fertilizing pump is also synchronized. (If the speed of the aircraft increases, the speed at which liquid fertilizer is supplied from the fertilizer pump to the surface increases. If the speed of the aircraft decreases, the speed at which liquid fertilizer is supplied from the fertilizer pump to the surface increases. The total amount of liquid fertilizer supplied to one paddy field does not change even if the power transmitted to the traveling transmission system is shifted by the transmission.

  According to the first feature of the present invention, the fertilization transmission system is branched from the portion between the one-way transmission mechanism and the planting transmission mechanism in the planting transmission system and connected to the fertilization pump. Thereby, even if the power transmitted to the traveling transmission system on the transmission side is shifted to the forward state and the reverse state, the forward power is transmitted to the fertilizer pump through the one-way transmission mechanism, and the reverse power is transmitted in one direction. Since it is interrupted by the transmission mechanism and is not transmitted to the fertilizer pump, there is no situation where the fertilizer pump is driven in the reverse direction by reverse power and is damaged.

In general , since the drive speed of the fertilizer pump is relatively low, the power transmitted to the fertilizer pump is decelerated when configured to transmit the power synchronized with the power transmitted to the traveling transmission system to the fertilizer pump. There is a need.
According to the 1st characteristic of this invention, it has comprised so that power may be transmitted to the fertilization output shaft from the part between the one-way transmission mechanism and planting transmission mechanism in a planting transmission system via a reduction mechanism. In this case, the speed reduction mechanism is provided inside the mission case, and it is not necessary to provide the speed reduction mechanism described above outside the mission case (even if the speed reduction mechanism needs to be provided outside the mission case, Since the speed reduction mechanism has already been decelerated, the speed reduction mechanism outside the transmission case can be made small (with a small reduction ratio).

(The invention's effect)
According to the first feature of the present invention, in a riding type rice transplanter configured to supply liquid fertilizer to a rice field while planting seedlings, the power applied to the fertilizer pump is synchronized with the power transmitted to the traveling transmission system. By being configured to be transmitted, the total amount of liquid fertilizer supplied to one paddy field is maintained at a set amount regardless of changes in the seedling planting interval by the seedling planting device. The supply performance of the liquid fertilizer of rice transplanter was able to be improved. According to the first feature of the present invention, since the fertilizer pump is driven in the reverse direction by the reverse power and is not damaged, it is advantageous in terms of protection of the fertilizer pump.
In addition, when the power transmitted to the fertilizer pump is decelerated, the reduction mechanism is provided inside the mission case, which is advantageous in terms of downsizing the fertilizer transmission system.

(Constitution)
The second feature of the present invention resides in the following configuration in the riding rice transplanter of the first feature of the present invention.
The transmission case is equipped with a shaft support part that can be attached to the fertilizer output shaft, and the shaft support part of the mission case is opened so that the fertilizer output shaft can be supported so as to protrude from the inside of the mission case. .

(Function)
According to the 2nd characteristic of this invention, it has the "action" similar to the 1st characteristic of this invention, and also has the following "action" in addition to this.
Ride type rice transplanters often produce two types: a type with a fertilizer tank, fertilizer pump and fertilizer nozzle, and a type without a fertilizer tank, fertilizer pump and fertilizer nozzle.

According to the second feature of the present invention, in a riding type rice transplanter equipped with a one-way transmission mechanism and a planting speed change mechanism inside a mission case, in a model equipped with a fertilizer tank, a fertilizer pump and a fertilizer nozzle, the axis of the mission case Supporting the fertilizer output shaft so that it protrudes from the inside of the transmission case by opening the support, and reducing the power from the part between the one-way transmission mechanism and the planting transmission mechanism in the planting transmission system What is necessary is just to comprise so that it may transmit to a fertilization pump via a mechanism and a fertilization output shaft (fertilization transmission system).

According to the second feature of the present invention, in a model that does not include a fertilizer tank, a fertilizer pump, and a fertilizer nozzle, the shaft support portion of the mission case remains as it is without opening, and a fertilizer output shaft may not be provided.
In this case, if the shaft support part of the mission case is opened from the beginning, and the model without the fertilizer tank, fertilizer pump and fertilizer nozzle is configured to close the shaft support part of the mission case with a lid member, Lubricating oil may leak from the shaft support (lid member). On the other hand, according to the second feature of the present invention, in a model that does not include a fertilizer tank, a fertilizer pump, and a fertilizer nozzle, since the opening is not processed in the shaft support portion of the mission case, lubrication from the shaft support portion of the mission case There is no such thing as oil leaking.

(The invention's effect)
According to the second feature of the present invention, the same “effect of the invention” as the first feature of the present invention is provided, and in addition to this, the following “effect of the invention” is provided.
According to the second feature of the present invention, the shaft support portion of the transmission case can appropriately produce a model with and without a fertilizer tank, a fertilizer pump, and a fertilizer nozzle, and a riding type. The productivity of the rice transplanter was improved.

(Constitution)
The third feature of the present invention resides in the following configuration in the riding type rice transplanter of the first or second feature of the present invention.
The fertilizer output shaft is equipped with a fertilizer clutch that can transmit and shut the power to the fertilizer pump.

(Function)
According to the third feature of the present invention, the “action” similar to that of the first or second feature of the present invention is provided, and in addition to this, the following “action” is provided.
In the riding type rice transplanter, since the liquid fertilizer is supplied to the rice field by the fertilizer nozzle while planting the seedling with the seedling planting device, it is necessary to start the operation at the same time and stop the operation at the same time.

In this case, there are many riding-type rice transplanters that have a seedling planting device equipped with a transmission case that can freely transmit and shut the power in the transmission case. Therefore, as in the third feature of the present invention, By providing the fertilization clutch that can be transmitted and cut off on the fertilization output shaft supported by the transmission case, the planting clutch and the fertilization clutch become close to each other. As a result, the planting clutch and the fertilizer clutch are linked so that the planting of the seedling by the seedling planting device and the supply of liquid fertilizer to the paddy surface by the fertilizer nozzle start and stop simultaneously. Can be performed relatively easily.
(The invention's effect)
According to the third feature of the present invention, it has the same “effect of the invention” as the first or second feature of the present invention, and in addition to this, has the following “effect of the invention”.
According to the third feature of the present invention, the planting clutch and the fertilization clutch can be linked relatively easily, which is advantageous in terms of simplification of the structure.

A fourth feature of the present invention resides in the following configuration in the riding rice transplanter of the first to third features of the present invention.
The power of the fertilization output shaft projected from the inside of the transmission case to the lateral outer side is transmitted to the transmission shaft that interlocks the left and right fertilization pumps.

[1]
As shown in FIGS. 1 and 2, a link mechanism 3 and a hydraulic cylinder 4 that drives the link mechanism 3 to move up and down are provided at the rear of the machine body including the right and left front wheels 1 and the right and left rear wheels 2. A six-row type seedling planting device 5 is supported at the rear of the link mechanism 3 to constitute a riding type rice transplanter.

  As shown in FIGS. 1 and 2, the seedling planting device 5 includes a transmission case 6, a planting case 7 that is rotatably supported at the rear part of the transmission case 6, and a pair provided at both ends of the planting case 7. Planting arm 8, grounding float 9, seedling table 10 and the like. As a result, the planting case 7 is rotationally driven as the seedling platform 10 is driven to reciprocate laterally to the left and right, and the planting arm 8 alternately takes out the seedlings from the lower part of the seedling platform 10 and puts them on the rice field. Plant.

[2]
Next, the transmission structure to the right and left front wheels 1 and the right and left rear wheels 2 in the mission case 17 will be described.
As shown in FIG. 1, a mission case 17 is fixed to the front part of the aircraft, and an engine 19 is supported on a support frame 18 connected to the front part of the mission case 17. The right and left front axle cases 20 are connected to the right and left lateral sides of the mission case 17 so that the right and left front wheels 1 can be steered around the vertical axis of the right and left front axle cases 20. It is supported by.

  As shown in FIGS. 4 and 7, a hydrostatic continuously variable transmission 21 (corresponding to a transmission) is connected to the upper front portion of the left lateral side portion of the transmission case 17, and the power of the engine 19 is It is transmitted to the input shaft 21 a of the hydrostatic continuously variable transmission 21 via a transmission belt 86. The hydrostatic continuously variable transmission 21 has a neutral stop position, and is configured to be continuously variable on the forward side and the reverse side. As shown in FIGS. 7 and 8, the input shaft 21a and the output shaft 2b of the hydrostatic continuously variable transmission 21 enter the inside of the transmission case 17 and are moved back and forth so as to have substantially the same height. The input shaft 21a of the step transmission 21 is disposed on the front side, and the output shaft 2b of the hydrostatic continuously variable transmission 21 is disposed on the rear side. The input shaft 21a of the hydrostatic continuously variable transmission 21 is the transmission case 17. It is located in the upper part of the front part of the transmission case 17 and is close to the front wall part 17 a of the mission case 17.

  As shown in FIGS. 7 and 8, the transmission shaft 22 is rotatably supported by the transmission case 17 via a bearing 23, and the output shaft 21b and the transmission shaft 22 of the hydrostatic continuously variable transmission 21 are splined. Connected by. A low-speed gear 24 and a high-speed gear 25 are fixed to the transmission shaft 22, and a shift gear 27 is externally fitted to the transmission shaft 26 arranged in parallel with the transmission shaft 22 so as to rotate and slide integrally with the transmission shaft 26 in a spline structure. Has been. As a result, the shift gear 27 is slid and engaged with the low speed gear 24 and the high speed gear 25, so that the power of the transmission shaft 22 is shifted in two steps to be transmitted to the transmission shaft 26.

  As shown in FIGS. 7 and 8, a pair of transmission shafts 28 are arranged to face each other across the transmission case 17 and the right and left front axle cases 20, and a differential mechanism 29 is provided between the pair of transmission shafts 28. A case 29 a of the differential mechanism 29 is supported by the transmission case 17 through a bearing 33 so as to be rotatable. A transmission gear 30 is fixed to the transmission shaft 26, and a transmission gear 31 fixed to the case 29 a of the differential mechanism 29 is engaged with the transmission gear 30.

  As shown in FIG. 7, a cylindrical member 32 is externally fitted to one transmission shaft 28 by a key structure so as to be integrally rotatable and slidable, and is linked to an operation shaft 41 that slides the cylindrical member 32, and the operation shaft 41. A differential lock pedal (not shown) is provided. Accordingly, when the diff lock pedal is depressed, the operation shaft 41 is rotated, the cylindrical member 32 is slid and engaged with the end of the case 29a of the differential mechanism 29, and the cylindrical member 32 is engaged with the case of the differential mechanism 29. By engaging the end of 29a, the differential mechanism 29 can be locked.

As shown in FIG. 7, a traveling output shaft 34 is provided at the rear of the mission case 17 and protrudes rearward, and a bevel gear 35 fixed to the case 29 a of the differential mechanism 29 is connected to the bevel gear provided to the traveling output shaft 34. Bites 36. As shown in FIG. 1, a rear axle case 37 that supports the right and left rear wheels 2 is provided, and a transmission shaft 38 extends across a travel output shaft 34 and an input shaft (not shown) of the rear axle case 37. Is connected.
As a result, as shown in FIGS. 1 and 7, the power of the output shaft 21b of the hydrostatic continuously variable transmission 21 is transferred to the right and left front wheels via the transmission shafts 22, 26, the differential mechanism 29, and the transmission shaft 28. 1 and transmitted to the right and left rear wheels 2 via the case 29a of the differential mechanism 29, the travel output shaft 34, and the transmission shaft 38.

  As shown in FIG. 7, a plurality of friction plates 39 are provided between the wall portion inside the mission case 17 and the travel output shaft 34, and the disc-shaped operation member 40 is attached to the travel output shaft 34 so as to be relatively rotatable. An operating shaft 42 that slides the operating member 40 and a brake pedal (not shown) linked to the operating shaft 42 are provided, and the brake pedal and the hydrostatic continuously variable transmission 21 are mechanically connected. It is linked to. Accordingly, when the brake pedal is depressed, the hydrostatic continuously variable transmission 21 is operated to the neutral stop position, the operation shaft 42 is rotated, the operation member 40 is slid, and the operation member 40 is moved to the friction plate. 39 is pressed, and the traveling output shaft 34 is braked. When the travel output shaft 34 is braked, the right and left front wheels 1 are braked via the differential mechanism 29 and the transmission shaft 28, and the right and left rear wheels are connected via the travel output shaft 34 and the transmission shaft 38. 2 is braked.

[3]
Next, the transmission structure to the seedling planting device 5 in the mission case 17 will be described.
As shown in FIG. 7, a cylindrical transmission gear 43 is externally fitted to the transmission shaft 22 via a one-way clutch 44 (corresponding to a one-way transmission mechanism), and the hydrostatic continuously variable transmission 21 by the one-way clutch 44. The forward power of the output shaft 21 b is transmitted to the transmission gear 43, and the reverse power of the output shaft 21 b of the hydrostatic continuously variable transmission 21 is not transmitted to the transmission gear 43 by the one-way clutch 44.

  As shown in FIGS. 7 and 10, the transmission gear 45 and the six transmission gears 46 are connected to each other so as to rotate integrally, so that the transmission gear 45 and the six transmission gears 46 are rotatable relative to the transmission shaft 26. The transmission gears 43 and 45 are engaged with each other. Six transmission gears 48 are fitted on a transmission shaft 47 arranged in parallel with the transmission shaft 26 so as to be relatively rotatable, and the six transmission gears 46 and the transmission gears 48 are engaged with each other. An operation rod 49 is provided which selects one of the transmission gears 48 and can be connected to and disconnected from the transmission shaft 47. As described above, the planting transmission mechanism 50 is configured by the six transmission gears 46, the transmission gears 48, the operation rods 49, and the like, and one transmission gear of the six transmission gears 48 is configured by the operation rods 49. By selecting 48 and connecting to the transmission shaft 47, the power of the transmission shaft 26 is shifted in six stages and transmitted to the transmission shaft 47.

  As shown in FIGS. 4 and 10, an output shaft 51 is provided at the upper part of the rear portion of the transmission case 17 and protrudes rearward, and a bevel gear 52 that is externally fitted to the output shaft 51 so as to be relatively rotatable is attached to the transmission shaft 47. It meshes with a fixed bevel gear 53. The shift member 54 is externally fitted to the output shaft 51 so as to be rotatable and slidable integrally with the output shaft 51 by a spline structure, and a spring 55 is provided to bias the shift member 54 to the occlusal side with the bevel gear 52. An operation rod 56 for operation is provided, and a planting clutch 57 that can transmit and shut the power of the transmission shaft 47 to and from the output shaft 51 is configured. As shown in FIG. 1, a transmission shaft 58 is connected across the output shaft 51 and an input shaft (not shown) of the seedling planting device 5.

  Thereby, as shown in FIGS. 1, 7, and 10, the power of the transmission shaft 26 is planted through the planting transmission mechanism 50, the bevel gears 52 and 53, the planting clutch 57, the output shaft 51, and the transmission shaft 58. Is transmitted to the device 5. By shifting the power transmitted to the seedling planting device 5 (transmission shaft 47) by the planting speed change mechanism 50, the seedling planting interval (working traveling speed of the machine body) by the seedling planting device 5 (planting arm 8) is changed. The ratio of the planting speed of the seedling planting device 5 (planting arm 8) with respect to can be changed.

[4]
Next, the transmission structure of the hydraulic pump 59 in the transmission case 17 will be described.
As shown in FIGS. 7, 8, and 9, a hydraulic pump 59 is connected to an upper front portion of the right side portion of the mission case 17, and an input shaft 59 a of the hydraulic pump 59 enters the inside of the mission case 17. It is out. The input shaft 21 a of the hydrostatic continuously variable transmission 21 and the input shaft 59 a of the hydraulic pump 59 are arranged concentrically, and the input shaft 59 a of the hydraulic pump 59 is located in the upper part of the front portion of the transmission case 17. And close to the wall 17a in front of the mission case 17.

  As shown in FIGS. 7, 8, and 9, the drive shaft 60 is disposed across the input shaft 21 a of the hydrostatic continuously variable transmission 21 and the input shaft 59 a of the hydraulic pump 59, so that the hydrostatic continuously variable transmission is performed. The input shaft 21a of the apparatus 21 and the drive shaft 60 are connected by a spline structure via a cylindrical connecting member 61, and the input shaft 59a and the drive shaft 60 of the hydraulic pump 59 are splined via a cylindrical connecting member 62. Connected by structure. As a result, the drive shaft 60 is arranged along the left-right direction inside the mission case 17 and is arranged along the wall portion 17 a in front of the mission case 17. As a result, as described in [2] above, the power of the engine 19 is transmitted to the input shaft 21a of the hydrostatic continuously variable transmission 21, and is transmitted to the hydraulic pump 59 via the drive shaft 60. 59 is driven.

  As shown in FIGS. 7, 8, and 9, the mission case 17 is filled with lubricating oil, and the mission case 17 is formed into an oil bath. The oil level of the mission case 17 is a hydrostatic continuously variable transmission 21. Are set slightly above the input shaft 21a and the output shaft 21b. The transmission shafts 26 and 47 and the planting transmission mechanism 50, the output shaft 51, the differential mechanism 29 and the transmission shaft 28, and the right and left positions are lower than the input shaft 21 a and the output shaft 21 b of the hydrostatic continuously variable transmission 21. A front axle case 20 and a travel output shaft 34 are disposed. As described in [5], which will be described later, a hydraulic power steering mechanism 63 is connected to the upper portion of the front portion of the transmission case 17, and a breather pipe 76 having an opening 76 a at the upper portion is connected to the power steering mechanism 63. Provided on the front side, an oil level gauge 77 is provided on the rear side of the power steering mechanism 63.

  As shown in FIGS. 7, 8, and 9, boss portions 17 b and 17 c surrounding the input shaft 21 a and the output shaft 21 b of the hydrostatic continuously variable transmission 21 are provided in the transmission case 17, and the input shaft 59 a of the hydraulic pump 59 is provided. A surrounding boss portion 17 d is provided in the mission case 17, and a pair of semicircular cutout portions 17 e are formed on the inner peripheral portion of the boss portion 17 b of the mission case 17.

  As a result, as shown in FIGS. 7, 8, and 9, the drive shaft 60 is in the lubricating oil of the transmission case 17, and the transmission is connected to the spline portion that connects the drive shaft 60 and the connecting members 61 and 62. The lubricating oil of case 17 enters. The lubricating oil in the transmission case 17 passes through the bearing 23 and enters the boss portion 17c of the transmission case 17, and the transmission case 17 is connected to the spline portion that connects the output shaft 21b and the transmission shaft 22 of the hydrostatic continuously variable transmission 21. Of lubricating oil.

  As shown in FIGS. 7, 8, and 9, the lubricating oil in the mission case 17 passes through the notch portion 17 e of the mission case 17 and the gap between the boss portion 17 b of the mission case 17 and the connecting member 61. The lubricating oil of the transmission case 17 enters the spline portion connecting the input shaft 21a of the hydrostatic continuously variable transmission 21 and the connecting member 61. The lubricating oil in the mission case 17 passes through the gap between the boss portion 17 d of the mission case 17 and the connecting member 62 and enters the boss portion 17 d of the mission case 17, and the input shaft 59 a of the hydraulic pump 59 and the connecting member 62. The lubricating oil of the transmission case 17 enters the spline portion connecting the two.

[5]
Next, the steering structure of the right and left front wheels 1 will be described.
As shown in FIGS. 7, 8, and 9, a hydraulic power steering mechanism 63 is connected to the upper portion of the front portion of the transmission case 17, and a steering handle 64 (see FIG. 1) above the transmission case 17 and the power steering mechanism 63. And the power steering mechanism 63 and the steering handle 64 are interlocked and connected via a steering shaft (not shown).

  As shown in FIGS. 7, 8, and 9, the steering shaft 65 passes vertically between the front wall portion 17 a of the transmission case 17 and the drive shaft 60 along the front wall portion 17 a of the transmission case 17. In the transmission case 17, the drive shaft 60 disposed along the left-right direction and the steering shaft 65 disposed along the vertical direction intersect with each other.

  As shown in FIGS. 8 and 9, a gear 65 a is formed at the lower portion of the steering shaft 65, and the lower portion of the steering shaft 65 is rotatably supported by the transmission case 17 via a bearing 66. A boss 65b is connected to the upper portion of the steering shaft 65 by a spline structure, and the boss 65b of the steering shaft 65 is rotatably supported by a boss 17f of the transmission case 17 via a bush 67. The output shaft 63a and the boss portion 65b of the steering shaft 65 are connected by a spline structure.

  As shown in FIG. 8, a steering shaft 68 is rotatably supported at the lower portion of the mission case 17, and a gear 68 a fixed to the upper portion of the steering shaft 68 is engaged with the gear 65 a of the steering shaft 65. A tie rod (not shown) is connected across the steering member 68 b fixed to the lower portion of the direction shaft 68 and the right and left front wheels 1. Thus, when the steering handle 64 is operated, the steering shaft 65 is rotated through the power steering mechanism 63, the steering member 68b of the steering shaft 68 is swung, and the right and left front wheels 1 are steered. Operated.

  As shown in FIG. 9, the filter 70 is connected to the lower front portion of the right side portion of the mission case 17, and the internal oil passage 17 g formed in the right wall portion 17 i of the mission case 17 is connected to the filter 70. To the hydraulic pump 59. A hydraulic pipe 71 is connected across the hydraulic pump 59 and the power steering mechanism 63, a control valve (not shown) for supplying and discharging hydraulic oil to and from the hydraulic cylinder 4 (see FIGS. 1 and 2), power A hydraulic pipe 72 is connected across the steering mechanism 63.

  As a result, as shown in FIG. 9, the lubricating oil in the mission case 17 is sucked into the filter 70 from the suction port (not shown) as the working oil, and from the filter 70 through the internal oil passage 17 g of the transmission case 17. 59. The hydraulic oil of the hydraulic pump 59 is supplied to the power steering mechanism 63 via the hydraulic pipe 71 and is supplied to the control valve via the hydraulic pipe 72 and is returned from the control valve to the transmission case 17.

As shown in FIGS. 8 and 9, inside the mission case 17, the pipe 73 extends from a pipe 73 that discharges the hydraulic oil that has overflowed from the hydrostatic continuously variable transmission 21, and the pipe 73 is connected to the left wall of the mission case 17. Along the inner surface of the portion 17j, the space between the drive shaft 60 and the transmission shaft 26 extends downward and extends rearward, and is connected to the left front axle case 20. A U-shaped receiving portion 17 h is integrally formed on the inner surface of the left wall portion 17 j of the transmission case 17, and the pipe 73 is inserted into the receiving portion 17 h of the transmission case 17. A pipe 73 is fixed.
As a result, as shown in FIGS. 7, 8, and 9, the hydraulic oil overflowed from the hydrostatic continuously variable transmission 21 is returned to the left front axle case 20 via the pipe 73, and the left front axle case Twenty hydraulic fluids return to the inside of the mission case 17 through the bearings 33.

[6]
Next, the supply of liquid fertilizer to the rice field by the first and second fertilization nozzles 82 and 83 will be described.
As shown in FIGS. 1, 2, and 3, steps 13 for getting on and off from the eaves to the driver's seat 11 are provided on the right and left sides of the lower part of the hood 12 covering the engine 19, and the support frame 18 to the support frame are provided. 110 extends to the right and left laterally outer sides, and the support frame 14 provided with the reserve seedling stage 14 a is fixed to the support frame 110 so as to be positioned laterally outside the right and left step 13. . A support frame 15 is fixed to the right and left support frames 14 toward the laterally outer side, and fertilizer tanks 16 and 69 for storing liquid fertilizer are fixed to the right and left support frames 15.

  As shown in FIGS. 1, 2, 3, and 5, lids 16a and 69a are provided at the front portions of the right and left fertilizer tanks 16 and 69 so as to be openable and closable around the rear fulcrum, and have a U-shaped frame in plan view. 16b and 69b are provided. As shown in FIGS. 13 and 14, a pin 112 is rotatably supported around a horizontal axis P <b> 2 at the front part of the right and left fertilizer tanks 16 and 69, and a frame 16 b is attached to a bracket 112 a fixed to the pin 112. 69b are slidably inserted, and a spring 113 is provided between the frames 16b, 69b and the bracket 112a of the pin 112.

  The solid line in FIG. 13 and the state shown in FIG. 14 are states in which the ends of the frames 16b and 69b are inserted into the brackets 16d and 69d fixed to the front portions of the right and left fertilizer tanks 16 and 69. The frames 16b and 69b are fixed to the state shown in the solid line in FIG. 13 and the state shown in FIG. 14 by the bracket 112a and the brackets 16d and 69d of the right and left fertilizer tanks 16 and 69, respectively. Thus, while the fertilizer cans (not shown) are placed on the frames 16b and 69b, the lid portions 16a and 69a of the right and left fertilizer tanks 16 and 69 are opened, and the right and left fertilizer tanks 16 and 69 are liquidized. Replenish fertilizer. By sliding the frames 16b and 69b leftward from the state shown in FIG. 13 and the state shown in FIG. 14, the ends of the frames 16b and 69b are removed from the brackets 16d and 69d of the right and left fertilizer tanks 16 and 69. The frames 16b and 69b can be directed downward around the horizontal axis P2 together with the pin 112 (see the solid line in FIG. 5 and the two-dot chain line in FIG. 13).

  As shown in FIGS. 3 and 5, a drive shaft 78 is rotatably supported along the front-rear direction in the right and left fertilizer tanks 16 and 69, and a stirring blade 78a is fixed to the drive shaft 78. An electric motor 79 for rotating the drive shaft 78 is provided at the rear of the right and left fertilizer tanks 16 and 69. As a result, the drive shaft 78 is rotationally driven by the electric motor 79 to stir the liquid fertilizer, thereby preventing the liquid fertilizer from solidifying.

  As shown in FIGS. 1, 3, 4, and 5, six fertilizer pumps 80 are arranged side by side in the front-rear direction in a state of facing left and right in the lower part of the left support frame 14 (left fertilizer tank 16). An outlet pipe 16c that is fixed and extends from the lower part of the rear part of the left fertilizer tank 16 is connected to the last fertilizer pump 80 (the six fertilizer pumps 80 communicate with each other internally). ). Three fertilizer pumps 81 are connected and fixed in the front-rear direction in a state of facing left and right in the lower part of the right support frame 14 (right fertilizer tank 69). An outlet pipe 69c extending from the lower part is connected to the last fertilizer pump 81 (the three fertilizer pumps 81 communicate with each other inside).

  As shown in FIGS. 1 and 4, each of the six planting strips by the planting arm 8 is provided with six pipe-shaped first fertilization nozzles 82, and the outlet of the first fertilization nozzle 82 is located beside the planting strip. It is placed in a shallow position in the rice field on the side. For the six planting strips, three pipe-shaped second fertilizer nozzles 83 (for the six planting strips 1 and 2, 3 and 4 strips, 5 and 6 strips) are provided, The exit of the 2nd fertilization nozzle 83 is arrange | positioned in the position deeper than the exit of the 1st fertilization nozzle 82 from the rice field between planting strips. Each of the six fertilizer pumps 80 and the six first fertilizer nozzles 82 is connected by a hose 84, and the three fertilizer pumps 81 and each of the three second fertilizer nozzles 83 are connected by a hose 85.

  With the above structure, as shown in FIGS. 1 and 4, the fertilizer pumps 80 and 81 are driven in accordance with planting of seedlings by the seedling planting device 5, and the liquid fertilizer in the left fertilizer tank 16 is applied to the fertilizer pump 80. The liquid fertilizer in the right fertilizer tank 69 is supplied through a hose 84 and a first fertilization nozzle 82 to a shallow position in the field on the side of the planting strip, and a fertilizer pump 81, a hose 85 and a second fertilization nozzle Via 83, it is supplied to a deep position in the rice field between the planting strips.

[7]
Next, the drive structure of the fertilizer pumps 80 and 81 will be described.
As shown in FIGS. 11 and 12, in the mission case 17, bearing receiving portions 17k and 17m (corresponding to shaft support portions) are located near the transmission shaft 26 of the right and left wall portions 17i and 17j of the mission case 17. ) Is formed. The state shown in FIG. 12 is a state in which the bearing receiving portions 17k, 17m of the mission case 17 are not opened, and nothing is supported by the bearing receiving portions 17k, 17m of the mission case 17, and the right and left fertilizers The tanks 16 and 69, the fertilizer pumps 80 and 81, the hoses 84 and 85, and the first and second fertilizer nozzles 82 and 83 are not included.

  The state shown in FIGS. 8 and 11 is a type including right and left fertilizer tanks 16 and 69, fertilizer pumps 80 and 81, hoses 84 and 85, and first and second fertilizer nozzles 82 and 83. The bearing receiving portion 17k of the mission case 17 is opened, and the first fertilization output shaft 88 is rotatably supported via the bearing 87. The first fertilization output shaft 88 is the right wall portion 17i of the mission case 17. Protrudes from the outside. A transmission gear 90 (corresponding to a speed reduction mechanism) is fixed to the first fertilization output shaft 88, and the transmission gear 90 is engaged with the transmission gear 46 having the smallest diameter of the planting transmission mechanism 50.

  As shown in FIGS. 4 and 11, a support case 91 is fixed to the right wall portion 17 i of the mission case 17 so as to cover the outside of the bearing receiving portion 17 k of the mission case 17, and is the same as the first fertilization output shaft 88. A second fertilization output shaft 89 is rotatably supported by the support case 91 in a core shape so as to be relatively rotatable. A shift member 92 is externally fitted to the second fertilization output shaft 89 in a spline structure so as to be integrally rotatable and slidable, and a spring 93 that biases the shift member 92 toward the first fertilization output shaft 88 and the shift member An operating shaft 94 for separating 92 from the first fertilizer output shaft 88 is provided, and a fertilizer clutch 95 is configured between the first fertilizer output shaft 88 and the shift member 92. A projection 17 n is formed outside the right wall 17 i of the mission case 17, and the operation shaft 94 does not come out of the support case 91 when the operation shaft 94 contacts the projection 17 n of the mission case 17.

  As shown in FIGS. 3 and 4, a speed change mechanism 96 capable of shifting in multiple stages is fixed to the lower portion of the right step 13, and one transmission shaft 97 extends over the lower portions of the right and left steps 13. The transmission chain 98 is wound around the output sprocket 89 a fixed to the second fertilization output shaft 89 and the input sprocket 96 a of the speed change mechanism 96 and fixed to the transmission shaft 97. A transmission chain 99 is wound around the input sprocket 97 a and the output sprocket 96 b of the speed change mechanism 96.

  As shown in FIG. 6, the fertilizer pumps 80 and 81 include a rotor 100 that pumps liquid fertilizer, a drive shaft 101 connected to the rotor 100, and a pair of transmission sprockets 102 that are externally fitted to the drive shaft 101 so as to be relatively rotatable. , A shift member 103 that is externally fitted to the drive shaft 101 so as to be integrally rotatable and slidable with a key structure, a spring 104 that biases the shift member 103 toward the engagement with the transmission sprocket 102, and the shift member 103 that is separated from the transmission sprocket 102 An operation arm 105 and the like for operation are provided.

  As shown in FIG. 6, the liquid fertilizer enters the room on the left side of the paper of the rotor 100 inside the fertilizer pumps 80 and 81, and the liquid fertilizer is rotated inside the fertilizer pumps 80 and 81 by the rotation of the rotor 100. It is pumped to the right room and is pumped from the plug 106 to the hoses 84 and 85. In this case, since the plug 106 is connected to the upper side of the fertilizer pumps 80 and 81, even if air stays in the room on the right side of the page of the rotor 100 inside the fertilizer pumps 80 and 81, the air is hose from the plug 106. 84 and 85 are easily fed.

  As shown in FIGS. 3, 4, and 6, the output sprocket 97 b is fixed to the left end of the transmission shaft 97, and extends across the transmission sprocket 102 of one fertilizer pump 80 and the output sprocket 97 b of the transmission shaft 97. A transmission chain 107 is wound, and a transmission chain 108 is wound around the transmission sprocket 102 of each adjacent fertilizer pump 80. A transmission shaft 109 is rotatably supported in the vicinity of the right end portion of the transmission shaft 97, and the transmission gear 97c fixed to the right end portion of the transmission shaft 97 and the transmission gear 109a fixed to the transmission shaft 109 are engaged. A transmission chain 107 is wound around the output sprocket 109b fixed to the transmission shaft 109 and the transmission sprocket 102 of one fertilizer pump 81, and each of the adjacent transmission sprockets 102 of the fertilizer pump 81 is wound around the transmission sprocket 102. A transmission chain 108 is wound around.

  With the above structure, as shown in FIGS. 7 and 10, the power of the engine 19 is transmitted to the right and left front wheels via the hydrostatic continuously variable transmission 21, the transmission shafts 22 and 26, the differential mechanism 29, and the transmission shaft 28. 1 and transmitted to the right and left rear wheels 2 via the case 29a of the differential mechanism 29, the travel output shaft 34, and the transmission shaft 38. The hydrodynamic continuously variable transmission 21 has a one-way clutch 44, transmission gears 43 and 45, a planting transmission mechanism 50 (transmission gears 46 and 48), bevel gears 52 and 53, a planting clutch 57, an output shaft 51, and the like. It is transmitted to the seedling planting device 5 through the transmission shaft 58.

  4, 7, 10, and 11, the power between the one-way clutch 44 and the planting transmission mechanism 50 (transmission gear 46) (the power of the transmission shaft 26 is 6 by the operation rod 49 in the planting transmission mechanism 50. Power before being transmitted to the transmission shaft 47), the transmission gear 90, the first fertilization output shaft 88, the fertilization clutch 95, the second fertilization output shaft 89, the transmission chain 98, the transmission mechanism 96, and the transmission chain. 99, the transmission shaft 97 and the transmission chains 107 and 108 are transmitted to the fertilizer pumps 80 and 81.

  As shown in FIGS. 4, 6, and 11, by operating the speed change mechanism 96, the drive speed of the fertilizer pumps 80 and 81 can be changed, and the amount of liquid fertilizer pumped by the fertilizer pumps 80 and 81 can be changed. it can. All the fertilizer pumps 80 and 81 can be stopped by operating the shift member 92 to be separated from the first fertilizer output shaft 88 by the operation shaft 94 and operating the fertilizer clutch 95 in the disconnected state. The desired fertilization pumps 80 and 81 can be stopped by operating the shift member 103 away from the transmission sprocket 102 by 105.

  In this case, as shown in FIGS. 4, 10, and 11, the planting clutch 57 (operation rod 56) and the fertilization clutch 95 (operation shaft 94) are close to each other. Are mechanically linked by a linkage link (not shown). Accordingly, when the planting clutch 57 is operated to the transmission state by the operation rod 56, the fertilization clutch 95 is operated to the transmission state by the operation shaft 94 in conjunction with this, and the planting clutch 57 is disconnected by the operation rod 56. When operated, the fertilization clutch 95 is operated to the disconnected state by the operation shaft 94 in conjunction with this operation.

  As shown in FIGS. 2, 4, and 6, in six planting strips, a first minority clutch (not shown) for stopping the planting arms 8 for the first and second strips, for the three and four strips A second minority clutch (not shown) that stops the planting arm 8 is provided, and a third minority clutch (not shown) that stops the fifth and sixth planting arms 8 is provided. First minority clutch and fertilization pumps 80 and 81 (operation arm 105) corresponding thereto, second minority clutch and corresponding fertilization pumps 80 and 81 (operation arm 105), third minority clutch and the like Each of the corresponding fertilization pumps 80 and 81 (operation arm 105) is mechanically linked by a wire 111. Accordingly, when the first, second, and third minority clutches are operated in the transmission state, the corresponding fertilizer pumps 80 and 81 (operation arm 105) are operated in the transmission state, and the first, second, and third minority strips are operated. When the clutch is operated in the disconnected state, the fertilizer pumps 80 and 81 (operation arm 105) corresponding to the clutch are operated in the disconnected state.

For example, when starting the work of one day, if the liquid fertilizer is not filled in the hoses 84 and 85 and the first and second fertilizer nozzles 82 and 83, the first seedling is started at the same time when the seedling planting is started. In addition, the liquid fertilizer may not be supplied to the rice field from the second fertilization nozzles 82 and 83, and the liquid fertilizer may be supplied to the rice field with a slight delay.
This riding type rice transplanter is provided with a manual handle (not shown) that can manually rotate the transmission shaft 97 shown in FIGS. 3 and 4. Accordingly, the transmission shaft 97 is driven to rotate by the manual handle while the speed change mechanism 96 is operated to the neutral position, thereby driving the fertilizer pumps 80 and 81, and the hoses 84 and 85 and the first and second fertilizer nozzles 82. 83 can be filled with liquid fertilizer.

[Another Embodiment of the Invention]
In the above-mentioned [Best Mode for Carrying Out the Invention], instead of the hydrostatic continuously variable transmission 21, a step-variable transmission having a plurality of forward and reverse positions is used. The transmission device may be configured by arranging a transmission device having a plurality of shift positions and a forward / reverse switching device in series.

  The electric shaft 79 is not always driven to rotate by the electric motor 79, but when the lids 16a and 69a of the right and left fertilizer tanks 16 and 69 are operated to open, the electric motor 79 is activated and the right and left fertilizer tanks 16 are operated. , 69 may be configured to stop the electric motor 79 when the lid portions 16a, 69a are closed. The electric motor 79 may be operated when the lid portions 16a and 69a of the right and left fertilizer tanks 16 and 69 are opened, and the electric motor 79 may be automatically stopped after a set time has elapsed.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Overall front view of riding rice transplanter Schematic showing fertilizer transmission system to fertilizer pump Side view of the area around the left fertilizer tank and fertilizer pump Longitudinal front view near the fertilizer pump under the left fertilizer tank Cross-sectional plan view of the mission case Longitudinal side view of the front of the mission case Front view of the front of the mission case Transverse plan view near the output shaft of the mission case Cross-sectional plan view of the mission case near the first and second fertilizer output shafts For models without right and left fertilizer tanks, fertilizer pumps, hoses, and first and second fertilizer nozzles, nothing is supported on the mission case bearing receptacles without opening the bearing receptacle bearing receptacles. Cross-sectional plan view of the mission case showing the condition Side view of the front of the right and left fertilizer tanks Top view of the front of the right and left fertilizer tanks

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 5 Seedling planting device 17 Mission case 17k Shaft support part of transmission case 19 Engine 21 Transmission 44 One-way transmission mechanism 50 Planting transmission mechanism 80, 81 Fertilizer pump 88, 89 Fertilizer output shaft 90 Deceleration mechanism 95 Fertilizer clutch

Claims (4)

Transmitting the power of the engine to the transmission, branching the power of the transmission to the traveling transmission system to the front wheels and the rear wheels,
The power of the transmission is branched to a planting transmission system to a seedling planting device via a one-way transmission mechanism that transmits forward power to the lower side and interrupts reverse power. With a planting speed change mechanism between the direction transmission mechanism and the seedling planting device,
A fertilizer is provided in which a fertilizer tank for storing liquid fertilizer and a fertilizer pump for pumping liquid fertilizer in the fertilizer tank are arranged on the lateral side of the front part of the machine body, and liquid fertilizer from the fertilizer pump is supplied to the rice field. With a nozzle,
The one-way transmission mechanism and the planting transmission mechanism in the planting transmission system are disposed inside a transmission case to which a front axle case is connected, and fertilizer is applied from a portion between the one-way transmission mechanism and the planting transmission mechanism. the transmission system is branched, a is a fertilization output shaft portion of the fertilization transmission system, to project laterally outward portion from the interior of the transmission case, constitutes the power of the fertilizer output shaft so as to transmit to the fertilizer pump ,
A reduction mechanism that decelerates and transmits power from a portion between the one-way transmission mechanism and the planting transmission mechanism in the planting transmission system to the fertilizer output shaft is provided inside the mission case,
The riding type rice transplanter configured to transmit power to the fertilization output shaft from the transmission gear having the smallest diameter among the plurality of transmission gears of the planting transmission mechanism . The transmission case is equipped with a shaft support that can be attached to the fertilization output shaft. By opening the shaft support of the transmission case, the fertilization output shaft can be supported so as to protrude from the inside of the transmission case. The riding type rice transplanter according to claim 1, which is configured as follows. The riding type rice transplanter according to claim 1 or 2 , wherein a fertilization output shaft is provided with a fertilization clutch capable of transmitting and interrupting power to the fertilization pump. In any one of Claims 1-3 comprised so that the motive power of the said fertilization output shaft protruded from the inside of the said mission case to the lateral outer side might be transmitted to the transmission shaft which interlocks the left and right fertilization pumps. Ride type rice transplanter as described.

Images