JP2020162443A - Working machine - Google Patents

Abstract

To improve productivity of an interval speed-change gear in a working machine in which the interval speed-change gear for changing a speed of power transmitted to a work device and changing a supply interval of agricultural materials.SOLUTION: There are provided a first transmission shaft 61, a second transmission shaft 62 to which the power of the first transmission shaft 61 is transmitted, and a third transmission shaft 63 supported in such a way as to be concentric with the first transmission shaft 61 in a state of being abutted on an end part 61a of the first transmission shaft 61. There are further provided speed-change operation parts 67, 68 for selecting one pair from upstream side gears 71, 72, 73 supported on the second transmission shaft 62, and downstream side gears 81, 82, 83 supported on the third transmission shaft 63. A stopper part 74 for stopping movements of the downstream side gears 81, 82, 83 to the first transmission shaft 61 side is constituted separately from the third transmission shaft 63, and is mounted on an end part 63a at the first transmission shaft 61 side in the third transmission shaft 63.SELECTED DRAWING: Figure 3

Description

The present invention relates to a working machine provided with a working device for supplying agricultural materials such as seedlings and seeds to a field while opening a supply interval along the traveling direction of the machine as the machine progresses.

As disclosed in Patent Document 1, the passenger-type rice transplanter, which is an example of the above-mentioned working machine, is provided with an interval transmission for changing the supply interval by shifting the power transmitted to the working device. There is something.

In Patent Document 1, a first transmission shaft to which power is transmitted to the interval transmission, a second transmission shaft supported in parallel with the first transmission shaft and transmitted to the power of the first transmission shaft, and a first transmission A third transmission shaft supported concentrically with the first transmission shaft in contact with the end of the shaft is provided, and a plurality of upper gears are supported by the second transmission shaft, and a plurality of lower side gears are supported. The gear is supported by the third transmission shaft.

In the interval transmission, one set of a plurality of upper gears and lower gears is selected, and the power of the second transmission shaft is transferred through the upper gears and lower gears of the selected set. 3 It is transmitted to the transmission shaft. By changing the selection of the pair of the upper gear and the lower gear, the power transmitted to the working device is changed, and the supply interval of the agricultural material is changed.

JP-A-2018-38371 (see 43, 48, 44, 49, 44b in FIG. 6)

In Patent Document 1, a flange-shaped stopper portion is integrally formed with the third transmission shaft at the end of the third transmission shaft on the first transmission shaft side, and is integrally formed with the first transmission shaft side of the lower gear. The movement of is stopped by the stopper part. In this case, there is room for improvement in terms of productivity of attaching the lower gear to the third transmission shaft.

An object of the present invention is to improve the productivity of the interval transmission in a work machine provided with an interval transmission that changes the supply interval of agricultural materials by shifting the power transmitted to the work apparatus.

The working machine of the present invention shifts between a working device that supplies agricultural materials to a field and a power transmitted to the working device while opening a supply interval along the traveling direction of the machine as the machine advances. Therefore, an interval transmission for changing the supply interval is provided, and the interval transmission has a first transmission shaft to which power is transmitted and a first transmission shaft supported in parallel with the first transmission shaft. A second transmission shaft to which power is transmitted, a third transmission shaft supported concentrically with the first transmission shaft in contact with the end of the first transmission shaft, and a second transmission shaft supported by the second transmission shaft. Select one of the plurality of upper gears, the plurality of lower gears supported by the third transmission shaft, and the plurality of pairs of the upper gear and the lower gear. A speed change operation unit for transmitting the power of the second transmission shaft to the third transmission shaft is provided via the upper gear and the lower gear of the set, and the lower gear is provided. The stopper portion for stopping the movement of the third transmission shaft to the first transmission shaft side is formed separately from the third transmission shaft and is attached to the end portion of the third transmission shaft on the first transmission shaft side. ..

According to the present invention, the interval transmission has a first transmission shaft to which power is transmitted, a second transmission shaft supported in parallel with the first transmission shaft and to transmit the power of the first transmission shaft, and a first transmission. A third transmission shaft supported concentrically with the first transmission shaft in contact with the end of the shaft is provided, and a plurality of upper gears supported by the second transmission shaft and a third transmission shaft are provided. A plurality of lower gears supported on the shaft are provided.

One set of a plurality of sets of upper gears and lower gears is selected by the transmission operation unit, and the power of the second transmission shaft is transmitted via the upper gears and lower gears of the selected sets. It is transmitted to the third transmission shaft.
By changing the selection of the pair of the upper gear and the lower gear from the shifting operation unit, the power transmitted from the second transmission shaft to the third transmission shaft is changed, and the power transmitted to the working device is changed. The supply interval of agricultural materials is changed.

According to the present invention, the stopper portion for stopping the movement of the lower gear to the first transmission shaft side is formed separately from the third transmission shaft, and is formed at the end portion of the third transmission shaft on the first transmission shaft side. It is attached.

As a result, when the lower gear is attached to the third transmission shaft, the lower gear is attached from the end side of the third transmission shaft on the first transmission shaft side in the state before the stopper portion is attached to the third transmission shaft. It may be attached to the third transmission shaft, and after all the lower gears are attached to the third transmission shaft, a stopper portion may be attached to the end portion of the third transmission shaft on the first transmission shaft side.
According to the present invention, the lower gear can be comfortably attached to the third transmission shaft from the end side of the third transmission shaft on the first transmission shaft side, thereby improving the productivity of the interval transmission. Can be made to.

In the present invention, it is preferable that the lower gear that the stopper portion contacts and stops is provided with a recess that allows the stopper portion to enter the lower gear.

According to the present invention, the stopper portion is attached to the end portion of the third transmission shaft on the first transmission shaft side so as to enter the recess of the lower gear, so that the stopper portion is disengaged from the third transmission shaft by the lower gear. It becomes difficult.

In the present invention, a shift member that is integrally rotatable and slidably attached to the first transmission shaft to shift the power transmitted from the first transmission shaft to the second transmission shaft is attached to the interval transmission. It is preferable that the end portion of the shift member on the third transmission shaft side is provided with a recess into which the end portion of the third transmission shaft on the first transmission shaft side can enter.

According to the present invention, in the interval transmission, in addition to shifting the power from the second transmission shaft to the third transmission shaft, the power is transmitted from the first transmission shaft to the second transmission shaft by sliding the shift member. Since the power can also be changed, the shifting range of the interval transmission can be set widely.

According to the present invention, the end of the shift member on the third transmission shaft side is provided with a recess into which the end of the third transmission shaft on the first transmission shaft side can enter, so that the shift member can be used as a lower gear. When the slide operation is performed to the position immediately before the contact, the end portion of the third transmission shaft on the first transmission shaft side can be inserted into the recess of the shift member to avoid contact between the shift member and the third transmission shaft. be able to.
As a result, the shift member can be arranged close to the third transmission shaft, and the entire interval transmission can be made compact.

In the present invention, a spline portion is formed on one and the other of the adjacent lower gears, and the spline portion of one of the lower gears and the spline portion of the other lower gear mesh with each other. It is preferable that the lower gear is attached between one and the other lower gear, and a plurality of the lower gears are integrally rotatably attached to the third transmission shaft.

As described above, the selection of the pair of the upper gear and the lower gear is changed from the speed change operation unit, the power transmitted from the second transmission shaft to the third transmission shaft is changed, and the power transmitted to the work apparatus is changed. When the gears are configured to be speed-shifted, all of the plurality of lower gears need to be integrally rotatably attached to the third transmission shaft.

According to the present invention, for example, in the case of three lower gears, by attaching one lower gear over the spline portion of the two lower gears, one is placed between the two lower gears. When the three lower gears are attached, the three lower gears are connected to each other and can rotate integrally.

As a result, for example, a spline portion is formed on the third transmission shaft, a spline portion is formed on all of the plurality of lower gears, and the spline portions of all the lower gears are attached to the spline portion on the third transmission shaft. Since it is less necessary to adopt a configuration in which all of the plurality of lower gears are integrally rotatably attached to the third transmission shaft, the structure of the interval transmission can be simplified.

In the present invention, a torque limiter provided on a portion opposite to the lower gear on the third transmission shaft on the opposite side of the first transmission shaft to transmit the power of the lower gear to the working device is provided. The torque limiter can rotate integrally with the spring receiving portion provided on the third transmission shaft and the lower gear so that the torque limiter is arranged on the opposite side of the lower gear in the torque limiter. The lower transmission that is slidably supported by the third transmission shaft over the position where the upper transmission portion meshes with the upper transmission portion and the position where the upper transmission portion is separated from the spring receiving portion side. A limiter spring is provided so as to extend the portion, the lower transmission portion, and the spring receiving portion to urge the lower transmission portion to the upper transmission portion, and the spring receiving portion is provided. It is preferable that the third transmission shaft is provided with a stop portion that supports and receives the urging force applied from the limiter spring to the spring receiving portion.

In the work machine, a torque limiter is provided on the portion opposite to the lower gear on the third transmission shaft on the opposite side of the first transmission shaft, and the power of the lower gear is transmitted to the work device via the torque limiter. It may be configured as follows.

In Patent Document 1, a third transmission shaft in which the lower gear is supported (see 44 in FIG. 6 of Patent Document 1) and a limiter transmission shaft in which a torque limiter is supported (see 45 in FIG. 6 of Patent Document 1) are used. However, it is configured as another transmission axis.
The torque limiter includes a spring receiving portion provided on the limiter transmission shaft, an upper transmission portion that can rotate integrally with the lower gear, a position at which the upper transmission portion is engaged, and a spring receiving portion side from the upper transmission portion. The lower side transmission part is slidably supported by the limiter transmission shaft over the position away from the limiter, and the lower side transmission part is provided over the lower side transmission part and the spring receiving part to urge the lower side transmission part to the upper side transmission part. A limiter spring is provided.

As a result, in Patent Document 1, when the lower transmission portion is urged and pressed by the upper transmission portion by the limiter spring, the lower transmission portion and the third transmission shaft are moved to the torque limiter via the upper transmission portion. It will be pressed toward the first transmission shaft side, which is the side away from the third transmission shaft, and the end portion of the third transmission shaft will be pressed against the end portion of the first transmission shaft.
The power of the first transmission shaft is changed and transmitted from the second transmission shaft to the third transmission shaft by the interval transmission, and the rotation speed of the first transmission shaft and the rotation speed of the third transmission shaft are different. It has become.

As described above, when the end of the third transmission shaft is pressed against the end of the first transmission shaft and the first transmission shaft and the third transmission shaft rotate at different rotation speeds, the third transmission shaft Wear is likely to develop at the end of the shaft and the end of the first transmission shaft.

On the other hand, according to the present invention, a torque limiter is provided on the portion opposite to the lower gear on the third transmission shaft on the opposite side of the first transmission shaft, and the lower gear and the torque limiter are common to the third. It is supported by the transmission shaft.
The spring receiving portion is stopped by the stop portion provided on the third transmission shaft, and the lower transmission portion is urged to the upper transmission portion by the limiter spring in a state where the limiter spring is received by the spring receiving portion. It is pressed, and the lower gear is pressed toward the first transmission shaft side, which is the side away from the torque limiter, via the upper transmission portion.

In this case, according to the present invention, the stopper portion for stopping the movement of the lower gear to the first transmission shaft side is attached to the end portion of the third transmission shaft on the first transmission shaft side. Even if the side gear is pressed toward the first transmission shaft side, the lower gear is stopped by the stopper portion, and the urging force of the limiter spring affects the outside from between the stop portion and the stopper portion of the third transmission shaft. It is in a state where it cannot be done.
As a result, the end of the third transmission shaft is less likely to be pressed against the end of the first transmission shaft, and even if the first transmission shaft and the third transmission shaft rotate at different rotation speeds, Progression of wear at the end of the third transmission shaft and the end of the first transmission shaft is suppressed.

According to the present invention, the lower gear, the torque limiter, and the third transmission shaft are supported by a common third transmission shaft, so that the lower gear, the torque limiter, and the third transmission shaft can be treated as one unit. It is possible to improve the productivity of the transmission.

In the present invention, it is preferable that the stop portion is integrally formed with the third transmission shaft.

According to the present invention, the integrally formed stop portion on the third transmission shaft is advantageous in terms of simplification of the structure.

According to the present invention, in a configuration in which a stopper portion separate from the third transmission shaft is attached to an end portion of the third transmission shaft on the side of the first transmission shaft, a stopper portion is integrally formed on the third transmission shaft. To.
As a result, when the torque limiter and the lower gear are attached to the third transmission shaft, the torque is applied from the end side of the third transmission shaft on the first transmission shaft side in the state before the stopper portion is attached to the third transmission shaft. The limiter (spring receiving part, limiter spring, lower side transmission part and upper side transmission part) may be attached to the third transmission shaft, and then the lower side gear may be attached to the third transmission shaft.
After all the lower gears and torque limiters are attached to the third transmission shaft, a stopper portion may be attached to the end portion of the third transmission shaft on the first transmission shaft side.

According to the present invention, the lower gear and the torque limiter can be comfortably attached to the third transmission shaft from the end side of the third transmission shaft on the first transmission shaft side, thereby producing an interval transmission. The sex can be improved.

In the present invention, the working device takes out the seedlings, which are agricultural materials, from the lower part of the seedling stand, and plants the seedlings on the field surface while opening the stocks which are the supply intervals along the traveling direction of the machine. It is a seedling planting device provided with a planting arm that is driven to rotate, and the interval transmission is an inter-strain transmission that changes the power transmitted to the seedling planting device to change between the stocks. The upper gear and the lower gear are configured as a set of the plurality of upper gears and the lower gears, and the angular speeds in one rotation of the power of the second transmission shaft are equalized. A set of constant velocity gears that shifts the power of the second transmission shaft and transmits the power to the third transmission shaft while maintaining the speed, and the upper gear and the lower gear are composed of eccentric gears. An eccentric gear set is provided to transmit the power of the second transmission shaft to the third transmission shaft at the same rotation speed while shifting the angular speed in one rotation of the power of the second transmission shaft to high or low. The planting clutch is provided on the opposite side of the lower gear with respect to the torque limiter to transmit the power of the torque limiter, and the planting clutch is provided and is concentric with the third transmission shaft. Arranged in a shape, the planting clutch is provided with an output shaft that transmits the power of the planting clutch to the seedling planting device, and the planting clutch can rotate integrally with the output shaft and meshes with the torque limiter. A clutch transmission portion slidably supported by the output shaft, a clutch spring for urging the clutch transmission portion to the transmission position, and a clutch spring over a transmission position to be operated and a cutoff position away from the torque limiter. A clutch operating unit capable of operating the clutch transmission unit at the shutoff position is provided, and the torque limiter and the clutch transmission unit mesh with each other only in one preset specific phase. The shape of the torque limiter and the clutch transmission unit is set, and the specific phase is transmitted to the third transmission shaft in a state where the eccentric gear set is selected by the speed change operation unit. The phase in which the planting arm rushes into the rice field surface and the seedlings held by the planting arm are separated from the planting arm and planted on the rice field surface in a state where the angular speed of the power is the highest in one rotation. It is preferable that it is set to.

A passenger-type rice transplanter, which is an example of a working machine, is equipped with a seedling planting device as a working device.
The seedling planting device takes out seedlings, which are agricultural materials, from the lower part of the seedling stand, and is rotationally driven to plant the seedlings on the rice field while opening the space between the stocks, which is the supply interval along the traveling direction of the machine. An arm is provided.

An inter-strain transmission is provided as an interval transmission, and the power transmitted to the seedling planting device is changed by the inter-strain transmission to change the inter-strain. A planting clutch is provided on the lower side of the torque limiter, and the power of the inter-stock transmission is transmitted from the torque limiter to the planting clutch and transmitted to the seedling planting device via the output shaft.

A clutch transmission unit and a clutch transmission unit that are slidably supported by the output shaft over a transmission position that can rotate integrally with the output shaft and mesh with the torque limiter and a cutoff position that is separated from the torque limiter. A clutch spring that urges the transmission position and a clutch operation unit that can operate the clutch transmission unit at the cutoff position against the clutch spring are provided.

In the planting clutch, the clutch transmission portion is operated to the transmission position by the clutch spring, so that the planting clutch is in the transmission state and the seedling planting device is operated. When the clutch transmission unit is operated to the disengaged position against the clutch spring by the clutch operating unit, the planting clutch is in the disengaged state and the seedling planting device is stopped.

In a passenger-type rice transplanter, the power transmitted to the seedling planting device may be changed to a low speed by the inter-strain transmission so that the planting arm is rotationally driven at a low speed to set a large value between the stocks ( Sparsely planted state).

In the seedling planting device, the planting arm rushes into the rice field surface after taking out the seedlings from the seedling stand, separates the seedlings from the rice field surface and plants them on the rice field surface, and then exits from the rice field surface upward.
As a result, when the above-mentioned sparse planting state is set and the planting arm is rotationally driven at a low speed, the time during which the planting arm rushes into the rice field becomes long, and when the aircraft advances in this state, the planting arm is planted. There is a possibility that the attached arm may progress while rushing into the rice field surface, resulting in rough rice field surface and poor seedling planting.

In the sparsely planted state, the upper gear and the lower gear are composed of eccentric gears in the inter-stock transmission as a configuration to prevent the planting arm from advancing while rushing into the field surface, and the power of the second transmission shaft. A set of eccentric gears may be provided to transmit the power of the power of the second transmission shaft to the third transmission shaft at the same rotation speed while shifting the angular speed in one rotation of the above.

As a result, in the inter-strain transmission, by selecting a set of eccentric gears in a sparsely planted state, the power transmitted to the third transmission shaft when the planting arm rushes into the rice field and separates the seedlings on the rice field. The angular velocity of the plant can be set to the highest speed in one rotation, and the time required for the planting arm to plunge into the field surface and exit from the field surface to the upper side can be shortened.
As a result, it is possible to suppress the state in which the planting arm advances while rushing into the rice field surface, and it is possible to suppress roughening of the rice field surface and poor planting of seedlings.

As described above, in order to prevent the planting arm from advancing while rushing into the field surface in the sparsely planted state, the angular velocity of the power transmitted to the third transmission shaft in the inter-strain transmission is within one rotation. It is necessary that the phase at which the maximum speed is achieved and the phase in which the planting arm rushes into the rice field surface and the seedlings are separated and planted on the rice field surface in the seedling planting device match.
In this case, since the planting clutch is arranged between the inter-strain transmission and the seedling planting device, when the planting clutch is operated in the cutoff state and then in the transmission state, the above-mentioned inter-stock transmission The planting clutch may be operated in the transmission state when the phase and the phase of the seedling planting device do not match.

On the other hand, according to the present invention, the torque limiter and the clutch transmission part of the planting clutch are engaged with each other so that the torque limiter and the clutch transmission part of the planting clutch mesh with each other only in one preset specific phase. The shape of is set.
In the above-mentioned specific phase, the planting arm rushes into the field surface and the seedlings held by the planting arm are planted in a state where the angular velocity of the power transmitted to the third transmission shaft is the highest in one rotation. The phase is set so that it can be planted on the rice field away from the attached arm.

As a result, even if the planting clutch is repeatedly operated in the cutoff state and the transmission state, the angular velocity of the power transmitted to the third transmission shaft in the inter-stock transmission is the highest in one rotation in the transmission state of the planting clutch. It is possible to match the high-speed phase with the phase in which the planting arm rushes into the rice field surface and the seedlings are separated and planted on the rice field surface in the seedling planting device.

In the present invention, the torque limiter and the clutch transmission portion are provided with a plurality of occlusal portions, and the position where the occlusal portion of the torque limiter and the occlusal portion of the clutch transmission portion occlude is the transmission position. The position where the occlusal portion of the torque limiter and the occlusal portion of the clutch transmission portion are separated is the blocking position, and the distance between the adjacent occlusal portions in the rotation direction is the rotation with the other adjacent occlusal portions. It is preferable that the torque limiter and the clutch transmission portion are occluded only in the specific phase by setting the interval different from the interval in the direction.

When the plurality of occlusal parts of the torque limiter and the plurality of occlusal parts of the clutch transmission part of the planting clutch are arranged at equal pitches along the rotation direction, the torque is generated when the planting clutch is operated in the transmission state. The occlusal part of the limiter and the occlusal part of the clutch transmission part of the planting clutch occlude in a plurality of phases. As a result, it is difficult to configure the torque limiter and the clutch transmission portion of the planting clutch so that they can occlude in only one specific phase.

According to the present invention, in the clutch transmission portion of the torque limiter and the planting clutch, the distance between adjacent occlusal portions in the rotational direction is set to be different from the interval in the rotational direction with other adjacent occlusal portions. As a result, it is possible to easily obtain a configuration in which the torque limiter and the clutch transmission portion of the planting clutch mesh only in a specific phase.

In the present invention, the occlusal portion of the clutch transmission portion is formed in a convex shape protruding toward the torque limiter side, and the occlusal portion of the torque limiter opens in a portion between the center and the outer peripheral portion of the torque limiter. The position where the occlusal portion of the clutch transmission portion enters and occludes the opening of the torque limiter is the transmission position, and the occlusal portion of the clutch transmission portion comes out of the opening of the torque limiter. It is preferable that the position separated from the above position is the cutoff position.

When the planted clutch is configured, the occlusal portion of the clutch transmission portion may be formed in a convex shape, and the occlusal portion of the torque limiter may be composed of an opening.
The position where the occlusal portion of the clutch transmission portion enters the opening of the torque limiter and engages is the transmission position, and the position where the occlusal portion of the clutch transmission portion escapes from the opening of the torque limiter is the blocking position. ..

According to the present invention, the opening of the torque limiter is opened in the portion between the center and the outer peripheral portion of the torque limiter, and the portion of the torque limiter on the center side of the torque limiter with respect to the opening of the torque limiter. There is a torque limiter portion in a portion on the outer peripheral portion side, a portion on the upper side and a portion on the lower side in the rotation direction of the torque limiter.
As a result, the entire circumference of the opening of the torque limiter is surrounded, and the opening of the torque limiter has sufficient strength, which is advantageous in terms of improving the durability of the planted clutch.

In the present invention, it is preferable that the clutch transmission portion is provided with a clutch stop portion that stops the clutch transmission portion from moving beyond the transmission position to the torque limiter side by the clutch spring.

The planted clutch is provided with a clutch transmission portion slidably supported on the output shaft and a clutch spring for urging the clutch transmission portion to the transmission position. When assembling the planted clutch in this state, the clutch transmission portion may be largely moved to the torque limiter side by the clutch spring, which may make it difficult to assemble the planted clutch.

According to the present invention, the state in which the clutch transmission portion moves beyond the transmission position to the torque limiter side by the clutch spring is stopped by the clutch stop portion, so that the clutch transmission portion moves significantly to the torque limiter side by the clutch spring. It is possible to improve the productivity of the planted clutch.

It is a left side view of a passenger-type rice transplanter. It is a schematic diagram which shows the transmission system from an engine to a front wheel and a rear wheel, a seedling planting device, a fertilizer application device and a ground leveling device. It is the left side view of the vertical section in the vicinity of the inter-stock transmission, the torque limiter and the planting clutch in a transmission case. It is a front view of the clutch transmission part in a planting clutch. It is sectional drawing of the clutch transmission part in a planting clutch. It is a development view of the occlusal part of the clutch transmission part in a planting clutch. It is a front view of the spring receiving part in a torque limiter.

FIGS. 1 to 7 show a passenger-type rice transplanter which is an example of a working machine. In FIGS. 1 to 7, F indicates a forward direction, B indicates a backward direction, and U indicates an upward direction. D indicates a downward direction, R indicates a right direction, and L indicates a left direction.

(Overall configuration of passenger rice transplanter)
As shown in FIG. 1, in a passenger-type rice transplanter, a link mechanism 4 is vertically swingably supported on the rear portion of an airframe 3 provided with right and left front wheels 1 and right and left rear wheels 2. A hydraulic cylinder 5 that extends to the rear side and raises and lowers the link mechanism 4 is provided.

The seedling planting device 6 (corresponding to a working device) is supported at the rear part of the link mechanism 4, and the link mechanism 4 is rocked up and down by the hydraulic cylinder 5 to raise and lower the seedling planting device 6. To. A ground leveling device 8 for leveling the rice field G (corresponding to a field) is supported at the lower part of the front side of the seedling planting device 6, and fertilizer is supplied to the rice field G over the rear part of the machine body 3 and the seedling planting device 6. A fertilizer application device 7 is provided.

(Overall configuration of seedling planting device)
As shown in FIG. 1, the seedling planting device 6 is provided with a planting transmission case 9, a rotating case 10, a planting arm 11, a float 12, a seedling stand 13, and the like.

The rotary case 10 is rotatably supported on the right and left portions of the rear portion of the planting transmission case 9, and the planting arms 11 are supported on both ends of the rotary case 10. The seedling stand 13 is supported so as to be movable in the left-right direction.

By the power transmitted to the seedling planting device 6, the rotary case 10 is rotationally driven while the seedling stand 13 is laterally fed and driven in the left-right direction, and the planting arm 11 alternately drives the seedling stand 13 from the lower part. Seedlings (corresponding to agricultural materials) are taken out and planted (supplied) on the rice field G.

In the rotating case 10, one planting arm 11 plants the seedlings on the rice field G, then the machine body 3 advances a little, and the other planting arm 11 plants the seedlings on the rice field G. In the seedlings planted on the field surface G, the distance between the seedlings along the traveling direction of the machine body 3 is the distance between the stocks (corresponding to the supply interval).

(Overall configuration of fertilizer application device)
As shown in FIG. 1, the fertilizer application device 7 is provided with a hopper 15, a feeding portion 16, a blower 17, a groove making device 18, a hose 19, and the like.

A hopper 15 for storing fertilizer and a feeding portion 16 are supported on the rear portion of the driver's seat 20 in the machine body 3, and a blower 17 is provided on the left lateral outer portion of the feeding portion 16. A groover 18 is attached to the float 12, and a hose 19 is connected to the feeding portion 16 and the groover 18.

The feeding portion 16 is driven by the power transmitted to the fertilizer applying device 7, the fertilizer of the hopper 15 is fed by the feeding portion 16, and is supplied to the groove making device 18 through the hose 19 by the transport wind of the blower 17. Fertilizer is supplied from the groove making device 18 to the groove of the field surface G while the groove is formed on the rice field surface G by the groove making device 18.

(Overall configuration of leveling equipment)
As shown in FIG. 1, the right and left support cases 14 supported by the lower right and left portions of the seedling planting device 6 extend diagonally downward on the front side. A drive shaft (not shown) is rotatably supported in the left-right direction over the front portion of the right and left support cases 14, and a large number of ground leveling bodies 21 are integrally rotatably attached to the drive shaft. There is.

The power transmitted to the seedling planting device 6 is branched and transmitted to the drive shaft via a transmission chain (not shown) inside the support case 14, and the drive shaft and the ground leveling body 21 are counterclockwise in FIG. The ground leveling body 21 is driven to rotate in the direction to level the ground surface G.

(Structure of transmission system to front and rear wheels)
As shown in FIGS. 1 and 2, the mission case 22 is supported by the front part of the airframe 3, the support frame 23 connected to the mission case 22 is extended to the front side, and the engine 24 is attached to the support frame 23. It is supported.

A hydrostatic type continuously variable transmission 25 is connected to the left side of the transmission case 22, and a transmission belt 26 is attached to the output shaft 24a of the engine 24 and the input shaft 25a of the continuously variable transmission 25. Has been done. The continuously variable transmission 25 can continuously change gears from the neutral position and the neutral position to the forward side and the reverse side.

Inside the transmission case 22, the transmission shaft 27 is connected to the output shaft 25b of the continuously variable transmission 25, and the low speed gear 28 and the high speed gear 29 are connected to the transmission shaft 27. The low-speed gear 31 and the high-speed gear 32 are attached to the transmission shaft 30 arranged in parallel with the transmission shaft 27 so as to be relatively rotatable, the low-speed gears 28 and 31 are occluded, and the high-speed gears 29 and 32 are occluded. ..

A shift member 33 is integrally rotatably and slidably attached to the transmission shaft 30 by a spline structure in a portion of the transmission shaft 30 between the low speed gear 31 and the high speed gear 32. By sliding the shift member 65 to engage the low-speed gear 31 and the high-speed gear 32, the power of the continuously variable transmission 25 (transmission shaft 27) is changed to two high and low stages and transmitted to the transmission shaft 30.
As described above, the auxiliary transmission 34 having the low speed gears 28 and 31, the high speed gears 29 and 32, the shift member 33 and the like is provided over the transmission shafts 27 and 30.

Right and left front wheel transmission shafts 35 that transmit power to the right and left front wheels 1 are provided, and a front wheel differential mechanism 92 is provided between the right and left front wheel transmission shafts 35. The transmission gear 36 connected to the transmission shaft 30 meshes with the transmission gear 37 connected to the case of the front wheel differential mechanism 92. The power of the auxiliary transmission 34 is transmitted from the transmission gears 36 and 37 to the front wheel differential mechanism 92, and is transmitted from the front wheel transmission shaft 35 to the front wheel 1.

The output shaft 38 to the rear wheel 2 is supported by the transmission case 22, and the bevel gear 39 connected to the case of the front wheel differential mechanism 92 and the bevel gear 40 connected to the output shaft 38 are in mesh with each other. The power of the auxiliary transmission 34 is transmitted from the transmission gears 36 and 37 and the bevel gears 39 and 40 to the output shaft 38, and is transmitted from the rear wheel transmission shaft 41 to the rear wheel 2.

(Structure of transmission system to fertilizer application device)
As shown in FIG. 2, the output shaft 42 to the fertilizer application device 7 is supported by the mission case 22, and the fertilizer clutch 44 is provided between the bevel gear 43 connected to the output shaft 38 and the output shaft 42. ing.

When the fertilizer application clutch 44 is operated in the transmission state, the power of the output shaft 38 is transmitted to the output shaft 42 via the bevel gear 43 and the fertilizer application clutch 44, and the fertilizer application device 7 (from the output shaft 42 via the linkage mechanism 45). It is transmitted to the feeding unit 16). When the fertilizer application clutch 44 is operated in the disengaged state, the fertilizer application device 7 (feeding portion 16) is stopped.

(Outline of transmission system to seedling planting device)
As shown in FIGS. 2 and 3, the mission case 22 is provided with an inter-stock transmission 46 (corresponding to an interval transmission), a torque limiter 47, a planting clutch 48, and an output shaft 49 to the seedling planting device 6. There is.

The power between the continuously variable transmission 25 and the auxiliary transmission 34 (power of the transmission shaft 27) is transmitted to the inter-stock transmission 46 as described below. The power of the inter-stock transmission 46 is transmitted from the torque limiter 47 to the planting clutch 48, and is transmitted from the output shaft 49 to the seedling planting device 6 and the ground leveling device 8 via the transmission shaft 50.

The transmission shaft 51 is supported concentrically with respect to the transmission shaft 27 so as to be rotatable relative to the transmission shaft 27, and the transmission gear 52 is connected to the transmission shaft 51. The transmission gear 53 is connected to the transmission shaft 27, the transmission gear 54 is attached to the transmission shaft 30 so as to be relatively rotatable, and the transmission gears 52, 53, 54 are occluded.

The transmission shaft 51 is supported so as to project outward from the transmission case 22, and similarly to the transmission shaft 51, a transmission shaft 55 supported so as to project outward from the mission case 22 is provided.

Transmission gears 56 and 57 are rotatably attached to the transmission shafts 51 and 55 at a portion of the transmission shafts 51 and 55 protruding outward from the mission case 22, and the transmission gears 56 and 57 are occluded. .. A cover 58 that covers the transmission gears 56 and 57 is attached to the mission case 22.

The power (power of the transmission shaft 27) between the continuously variable transmission 25 and the auxiliary transmission 34 is transmitted to the transmission gears 53, 54, 52, the transmission shaft 51, the transmission gears 56, 57, the transmission shaft 55, and the transmission shaft 55. It is transmitted to the inter-stock transmission 46 via the connected bevel gear 59.

When the front wheels 1 and the rear wheels 2 are changed to the front wheels 1 and the rear wheels 2 having different outer diameters, the cover 58 is removed, the transmission gears 56 and 57 are removed from the transmission shafts 51 and 55, and the changed front wheels 1 and rear wheels 1 and rear are removed. Other transmission gears 56, 57 having a reduction ratio suitable for the wheel 2 can be attached to the transmission shafts 51, 55, after which the cover 58 may be reattached.

(Structure of 1st transmission shaft, 2nd transmission shaft and 3rd transmission shaft in inter-stock transmission)
As shown in FIGS. 2 and 3, a cylindrical first transmission shaft 61 and a cylindrical third transmission shaft 63 are rotatably attached to the outside of the output shaft 49, and the first transmission shaft 61 And the output shaft 49 is supported by the transmission case 22 by the bearing 60. The bevel gear 64 connected to the first transmission shaft 61 meshes with the bevel gear 59, and the power of the transmission shaft 55 is transmitted to the first transmission shaft 61 via the bevel gears 59 and 64.

By supporting the first transmission shaft 61 and the third transmission shaft 63 by the output shaft 49, the end portion 61a on the third transmission shaft 63 side of the first transmission shaft 61 and the first transmission shaft of the third transmission shaft 63 The first transmission shaft 61, the third transmission shaft 63, and the output shaft 49 are concentrically supported in a state where the end portion 63a on the 61 side is in contact with the end portion 63a.

The second transmission shaft 62 is supported in parallel with the first transmission shaft 61 and the third transmission shaft 63. The shift member 65 is integrally rotatably and slidably attached to the first transmission shaft 61 by a spline structure, and the shift member 65 is provided with a low speed gear 65a and a high speed gear 65b.

The transmission gear 66 is connected to the second transmission shaft 62. By sliding the shift member 65 to engage the low-speed gear 65a and the high-speed gear 65b of the shift member 65 with the transmission gear 66, the power of the first transmission shaft 61 is changed to two high and low stages, and the second transmission is performed. It is transmitted to the shaft 62.

(Structure related to the upper gear in the inter-stock transmission)
As shown in FIGS. 2 and 3, three upper gears 71, 72, and 73 are rotatably supported by the second transmission shaft 62.

The upper gear 71 is an eccentric gear in which the center of the upper gear 71 is deviated from the center of the second transmission shaft 62. The upper gears 72 and 73 are constant velocity gears in which the centers of the upper gears 72 and 73 coincide with the centers of the second transmission shaft 62.

A slit 62a is formed in the second transmission shaft 62, and a flat plate-shaped key member 67 (corresponding to a speed change operation unit) is inserted into the slit 62a of the second transmission shaft 62. The key member 67 can rotate integrally with the second transmission shaft 62, and can slide in the axis direction (left-right direction in FIG. 3) of the second transmission shaft 62.

The key member 67 is moved along the axis direction of the second transmission shaft 62 to engage the engaging portion 67a of the key member 67 with the inner diameter portions of the upper gears 71, 72, 73, thereby engaging the key member 67. The upper gears 71, 72, and 73 with which the engaging portion 67a of 67 is engaged are in a state of rotating integrally with the second transmission shaft 62. A spring 69 and a detent member 70 that urge the engaging portion 67a of the key member 67 on the engaging side with the upper gears 71, 72, 73 are provided on the second transmission shaft 62.

The speed change operation shaft 68 (corresponding to the speed change operation unit) is inserted into the second transmission shaft 62 so as to be movable in the axis direction (left-right direction in FIG. 3) of the second transmission shaft 62. A ring-shaped groove 68a is formed at the end of the speed change operation shaft 68, and the end 67b of the key member 67 is inserted into the groove 68a of the speed change operation shaft 68.

When the key member 67 rotates integrally with the second transmission shaft 62, the end portion 67b of the key member 67 rotates inside the groove portion 68a of the speed change operation shaft 68. In this state, when the speed change operation shaft 68 is slid, the key member 67 is slid in the direction of the axis of the second transmission shaft 62, and the engaging portion 67a of the key member 67 is engaged with the upper gear. 71, 72, 73 are changed.

(Structure related to the lower gear in the inter-stock transmission)
As shown in FIGS. 2 and 3, three lower gears 81, 82, and 83 are rotatably supported by the third transmission shaft 63.

The lower gear 81 is an eccentric gear in which the center of the lower gear 81 is deviated from the center of the third transmission shaft 63, and is in mesh with the upper gear 71. The lower gears 82 and 83 are constant velocity gears in which the centers of the lower gears 82 and 83 coincide with the centers of the third transmission shaft 63, and are in mesh with the upper gears 72 and 73.

Male spline portions 81a and 83a are formed on one and the other of the adjacent lower gears 81 and 83, and female spline portions 82a are formed on the other lower gear 82. Another lower gear 82 meshes with the spline portion 81a of one lower gear 81 and the spline portion 83a of the other lower gear 83 so that the spline portion 82a of the other lower gear 82 meshes with the spline portion 83a of the other lower gear 83. It is attached between one and the other lower gears 81 and 83.

The lower gears 81, 82, 83 are connected to each other by spline portions 81a, 82a, 83a of the lower gears 81, 82, 83, and are attached to the third transmission shaft 63 in an integrally rotatable state. A spline portion is not formed at a portion of the third transmission shaft 63 to which the lower gears 81, 82, 83 are attached.

The ring-shaped stopper portion 74 for stopping the movement of the lower gears 81, 82, and 83 toward the first transmission shaft 61 is formed separately from the third transmission shaft 63, and is the first in the third transmission shaft 63. It is attached to the end 63a on the transmission shaft 61 side.
A ring-shaped recess 81b is formed in the lower gear 81 that the stopper portion 74 directly contacts and stops, and the stopper portion 74 is inserted into the recess 81b of the lower gear 81.

A ring-shaped recess 65c is formed at the end of the shift member 65 on the third transmission shaft 63 side. When the shift member 65 is slid toward the third transmission shaft 63 at a position where the low speed gear 65a of the shift member 65 meshes with the transmission gear 66, the shift member 65 (high speed gear 65b) is substantially moved to the lower gear 81. Approach to the contacting position.

In the above-mentioned state, the recess 65c of the shift member 65 is in a state of overhanging the end portion 63a on the first transmission shaft 61 side of the third transmission shaft 63 in the radial direction, and the first transmission in the third transmission shaft 63 The end 63a on the shaft 61 side is in a state of entering the recess 65c of the shift member 65.

(Transition state of inter-stock transmission)
As shown in FIGS. 2 and 3, in the inter-stock transmission 46, three sets of upper gears 71, 72, 73 and lower gears 81, 82, 83 are provided.

In the set of the upper gears 72 and 73 and the lower gears 82 and 83, the upper gears 72 and 73 and the lower gears 82 and 83 are composed of constant speed gears, and one rotation of the power of the second transmission shaft 62. It is a set of constant speed gears that shifts (accelerates) the power of the second transmission shaft 62 and transmits it to the third transmission shaft 63 while maintaining the angular speed in the above.

In the set of the upper gear 71 and the lower gear 81, the upper gear 71 and the lower gear 81 are composed of eccentric gears, and the angular speed in one rotation of the power of the second transmission shaft 62 is increased or decreased. It is a set of eccentric gears that transmit the power of the power of the second transmission shaft 62 to the third transmission shaft 63 at the same rotation speed while shifting gears.

When changing between stocks in the range of normal stocks by the inter-stock transmission 46, the following operations are performed.
As described above (configuration of the first transmission shaft, the second transmission shaft, and the third transmission shaft in the inter-stock transmission), the power of the first transmission shaft 61 is increased or decreased by sliding the shift member 65. The speed is changed to a step so that it is transmitted to the second transmission shaft 62.

As described above (configuration related to the upper gear in the inter-stock transmission), the key member 67 is slid by the shifting operation shaft 68, and the engaging portion 67a of the key member 67 is moved to the upper gear 72 or the upper gear. Engage with 73.

A set of the upper gear 72 and the lower gear 82 (a set of constant speed gears) or a set of the upper gear 73 and the lower gear 83 (a set of constant speed gears) is selected, and the selected set is good. The power of the second transmission shaft 62 is changed (accelerated) via the side gears 72, 73 and the lower gears 82, 83, and is transmitted to the lower gears 81, 82, 83 (third transmission shaft 63). Therefore, it is possible to shift four gears.

When setting the sparsely planted stocks by the inter-stock transmission 46, the following operations are performed.
As described above (configuration of the first transmission shaft, the second transmission shaft, and the third transmission shaft in the inter-stock transmission), the low speed gear 65a of the shift member 65 is engaged with the transmission gear 66 to engage the first transmission shaft. The power of 61 is transmitted to the second transmission shaft 62 in a low speed state.

As described above (configuration related to the upper gear in the inter-stock transmission), the key member 67 is slid by the shifting operation shaft 68 to engage the engaging portion 67a of the key member 67 with the upper gear 71. ..

A set of the upper gear 71 and the lower gear 81 (a set of eccentric gears) is selected, and the power of the second transmission shaft 62 is poor via the upper gear 721 and the lower gear 81 of the selected set. It is transmitted to the side gears 81, 82, 83 (third transmission shaft 63). In this case, the low-speed power transmitted to the second transmission shaft 62 is changed to a high or low angular velocity in one rotation of the power of the second transmission shaft 62, and the lower gears 81 and 82 have the same rotation speed. , 83 (third transmission shaft 63).

(Torque limiter configuration)
As shown in FIGS. 2 and 3, a portion of the third transmission shaft 63 opposite to the lower gears 81, 82, 83 of the first transmission shaft 61 is extended, and this extended portion is provided. A spline portion 63b is formed on the surface.

A torque limiter 47 for transmitting the power of the lower gears 81, 82, 83 (third transmission shaft 63) to the planting clutch 48 is provided on the spline portion 63b of the third transmission shaft 63.
The torque limiter 47 is provided with a spring receiving portion 75, an upper transmission portion 76, a lower transmission portion 77, and a limiter spring 78.

The spring receiving portion 75 is formed in a disk shape and is integrated with the spline portion 63b of the third transmission shaft 63 so as to be arranged on the opposite side of the lower gears 81, 82, 83 of the torque limiter 47. It is mounted rotatably.
The upper transmission portion 76 is integrally rotatably attached to the spline portion 83b of the lower gear 83, and is rotatable integrally with the lower gears 81, 82, and 83.

The lower transmission portion 77 is integrally rotatable and slidably supported by the spline portion 63b of the third transmission shaft 63, and is supported at a position where it meshes with the upper transmission portion 76 and receives a spring from the upper transmission portion 76. It is slidable over a position away from the portion 75 side.
The limiter spring 78 is provided over the lower side transmission portion 77 and the spring receiving portion 75, and urges the lower side transmission portion 77 to the upper side transmission portion 76.

A ring-shaped stopper 63c is integrally formed with the third transmission shaft 63 at the opposite end of the first transmission shaft 61 of the third transmission shaft 63. The spring receiving portion 75 is supported by the stopping portion 63c of the third transmission shaft 63, and the urging force applied from the limiter spring 78 to the spring receiving portion 75 is received.

As described in the above-mentioned (shift state of the inter-stock transmission), the power transmitted to the lower gears 81, 82, 83 (third transmission shaft 63) is inferior from the upper transmission 76 in the torque limiter 47. It is transmitted to the third transmission shaft 63 (spline portion 63b) via the side transmission portion 77, and is transmitted from the spring receiving portion 75 to the planting clutch 48.

When a large load is generated from the torque limiter 47 on the lower side in the transmission system to the seedling planting device 6, the lower side transmission portion 77 is transmitted on the upper side in the torque limiter 47 against the urging force of the limiter spring 78. The power is cut off from the portion 76 toward the spring receiving portion 75 side.

(State of limiter spring on the 3rd transmission shaft)
As described in FIG. 3 and the above-mentioned (torque limiter configuration), the spring receiving portion 75 is stopped by the stopping portion 83c of the third transmission shaft 63, and the limiter spring 78 is received by the spring receiving portion 75.

In the above state, the lower side transmission portion 77 is urged and pressed by the upper side transmission portion 76 by the limiter spring 78, and the lower side gears 81, 82, 83 are pushed by the upper side transmission portion 76, and the torque limiter 47 It is pressed toward the first transmission shaft 61 side, which is the side away from the above.

As shown in FIG. 3, a stopper portion 74 for stopping the movement of the lower gears 81, 82, 83 toward the first transmission shaft 61 side is attached to the end portion 63a of the third transmission shaft 63 on the first transmission shaft 61 side. Has been done.

Even if the lower gears 81, 82, 83 are pressed toward the first transmission shaft 61 by the limiter spring 78, the lower gears 81, 82, 83 are stopped by the stopper portion 74, and the urging force of the limiter spring 78 is increased. It is in a state where it cannot affect the outside from between the stop portion 63c and the stopper portion 74 of the third transmission shaft 63.

As a result, the end portion 63a on the first transmission shaft 61 side of the third transmission shaft 63 is less likely to be pressed by the end portion 61a of the first transmission shaft 61, and the first transmission shaft 61 and the third transmission shaft 61 are less likely to be pressed. Even if the shaft 63 rotates at different rotation speeds, the progress of wear of the end portion 63a on the first transmission shaft 61 side and the end portion 61a of the first transmission shaft 61 on the third transmission shaft can be suppressed.

(Composition of planting clutch)
As shown in FIGS. 2 and 3, a spline portion 49a is formed at a portion of the output shaft 49 protruding from the third transmission shaft 63. The planting clutch 48 is arranged on the opposite side of the lower gears 81, 82, 83 (third transmission shaft 63) with respect to the torque limiter 47, and is supported by the spline portion 49a of the output shaft 49.
The planting clutch 48 is provided with a clutch transmission unit 79, a clutch spring 80, and a clutch operation unit 84.

The clutch transmission portion 79 is integrally rotatable and slidably supported by the spline portion 49a of the output shaft 49, and has a transmission position that meshes with the torque limiter 47 (spring receiving portion 75) and a torque limiter 47 (spring). It can slide over a blocking position away from the receiving portion 75).

The clutch spring 80 is provided over the clutch transmission portion 79 and the bearing 60 to urge the clutch transmission portion 79 to the transmission position.
The clutch operating unit 84 is formed in a rod shape, and is supported by the transmission case 22 so that the clutch operating unit 84 can be slid along the axial center direction of the clutch operating unit 84.

In a state where the clutch transmission unit 79 is operated to the transmission position shown in FIG. 3, when the clutch operation unit 84 is slid toward the clutch transmission unit 79, the clutch operation unit 84 moves to the cam on the outer peripheral surface of the clutch transmission unit 79. In contact with the portion, the clutch transmission portion 79 is operated to the cutoff position against the urging force of the clutch spring 80. As a result, the planting clutch 48 is shut off, and the seedling planting device 6 and the ground leveling device 8 are stopped.

When the clutch operation unit 84 is slid to the side away from the clutch transmission unit 79, the clutch transmission unit 79 is operated to the transmission position by the urging force of the clutch spring 80, and the planted clutch 48 is in the transmission state. ..

In the transmission state of the planting clutch 48, the power of the torque limiter 47 (spring receiving portion 75) is planted as described in (Outline of transmission system to seedling planting device) and (Structure of torque limiter) described above. In the attached clutch 48, it is transmitted from the clutch transmission unit 79 to the output shaft 49, and is transmitted from the output shaft 49 to the seedling planting device 6 and the ground preparation device 8 via the transmission shaft 50, and is transmitted to the seedling planting device 6 and the ground preparation device 6. 8 operates.

A ring-shaped clutch stopper 85 is provided on the output shaft 49 between the end of the spline portion 49a of the output shaft 49 on the third transmission shaft 63 side and the stopper 63c of the third transmission shaft 63. ..

When the clutch transmission portion 79, the clutch spring 80, the bearing 60, etc. are attached from the opposite end of the third transmission shaft 63 on the output shaft 49 in a state where the third transmission shaft 63 and the output shaft 49 are separated. Even if the clutch transmission portion 79 tries to move to the torque limiter 47 side (third transmission shaft 63 side) beyond the spline portion 49a (transmission position) of the output shaft 49 by the clutch spring 80, the clutch transmission portion 79 clutches. It is stopped by the stop portion 85.

(Configuration related to the specific phase of the clutch transmission part in the planted clutch)
As shown in FIGS. 4, 5 and 6, a C-shaped base portion 79a in front view is provided on the torque limiter 47 (spring receiving portion 75) side portion of the clutch transmission portion 79, and the torque limiter 47 (spring receiving portion 75) is provided. It is provided so as to protrude to the side.

The three occlusal portions 86, 87, 88 are formed in a convex shape protruding toward the torque limiter 47 (spring receiving portion 75), and are provided on the base portion 79a of the clutch transmission portion 79. The occlusal portions 86, 87, 88 have convex portions 86a, 87a, 88a, and inclined portions 86b, 87b, 88b extending over the convex portions 86a, 87a, 88a and the base portion 79a of the clutch transmission portion 79. The occlusal portions 86, 87, 88 are arranged in one circle concentric with the clutch transmission portion 79 in a front view, and are formed in an arc shape along this circle.

The occlusal portions 86, 87, 88 have the same length L1 (angle) along the rotation direction. The distance W1 (angle) between adjacent occlusal portions 86, 87 in the rotation direction, the distance W2 (angle) between adjacent occlusal portions 87, 88 in the rotation direction, and the rotation direction between adjacent occlusal portions 88, 86. In the interval W3 (angle), the intervals W1, W2, and W3 are set to different intervals (angles).

As shown in FIG. 7, in the torque limiter 47, three openings 89, 90, 91 (corresponding to the occlusal portion) are opened in the spring receiving portion 75 through the spring receiving portion 75. The openings 89, 90, 91 are arranged in a circle concentric with the spring receiving portion 75 in a front view, and are formed in an arc shape along this circle, and this circle is the occlusion shown in FIG. It has the same diameter as the circle in which the portions 86, 87, 88 are arranged.

The openings 89, 90, 91 are opened in a portion between the center of the spring receiving portion 75 and the outer peripheral portion, and the portion on the center side of the spring receiving portion 75 with respect to the openings 89, 90, 91. A portion of the spring receiving portion 75 exists in a portion on the outer peripheral portion side of the spring receiving portion 75, a portion on the upper side and a portion on the lower side in the rotation direction of the spring receiving portion 75. As a result, in the spring receiving portion 75, the entire circumference of the openings 89, 90, 91 is surrounded, and the openings 89, 90, 91 have sufficient strength.

The openings 89, 90, 91 have the same length L1 (angle) along the rotation direction, and the length L1 (angle) of the openings 89, 90, 91 is the occlusal portion 86, 87, 88. It is the same value as the length L1 (angle) of.

Spacing W1 (angle) in the direction of rotation of adjacent openings 89,90, spacing W2 (angle) in the direction of rotation of adjacent openings 90,91, spacing W3 in the direction of rotation of adjacent openings 91,89 (Angles) are set to different intervals (angles) from each other. The intervals W1, W2, W3 of the openings 89, 90, 91 are the same values as the intervals W1, W2, W3 of the occlusal portions 86, 87, 88 shown in FIG.

The position where the occlusal portions 86, 87, 88 of the clutch transmission portion 79 enters and engages with the openings 89, 90, 91 of the torque limiter 47 (spring receiving portion 75) is the transmission position of the clutch transmission portion 79.
The position where the occlusal portions 86, 87, 88 of the clutch transmission portion 79 are disengaged from the openings 89, 90, 91 of the torque limiter 47 (spring receiving portion 75) is the blocking position of the clutch transmission portion 79.

(State of specific phase of clutch transmission part in planted clutch)
As described above (configuration relating to a specific phase of the clutch transmission portion in the planted clutch), the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 are configured, so that the clutch transmission portion 79 is engaged. The portion 86 can enter only into the opening 89 of the torque limiter 47 (spring receiving portion 75).

Similarly, the occlusal portion 87 of the clutch transmission portion 79 can enter only the opening 90 of the torque limiter 47 (spring receiving portion 75). The occlusal portion 88 of the clutch transmission portion 79 can enter only the opening 90 of the torque limiter 47 (spring receiving portion 75).

The occlusal portion 86 of the clutch transmission portion 79 enters the opening 89 of the torque limiter 47 (spring receiving portion 75), and the occlusal portion 87 of the clutch transmission portion 79 enters the opening 90 of the torque limiter 47 (spring receiving portion 75). The state in which the occlusal portion 88 of the clutch transmission portion 79 has entered the opening 90 of the torque limiter 47 (spring receiving portion 75) is a state of one specific phase set in advance. The torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 can be occluded only in this one specific phase.

As described in FIG. 3 and the above-mentioned (shifting state of the inter-stock transmission), the low-speed gear 65a of the shift member 65 is engaged with the transmission gear 66, and the engaging portion 67a of the key member 67 is engaged with the upper gear 71. Then, when the planting clutch 48 is operated in the transmission state in the state where the sparsely planted stocks are set by the inter-stock transmission 46 (torque limiter 47 (spring receiving portion 75) and clutch transmission portion 79 are specified). (When occluded in phase), the state is as follows.

As shown in FIGS. 1 and 3, in a phase in which the planting arm 11 rushes into the rice field G and the seedlings held by the planting arm 11 are planted on the rice field G away from the planting arm 11, the lower gear The power of the second transmission shaft 62 is the upper gear 71 and the lower gear 81 so that the angular speed of the power transmitted to the 81, 82, 83 (third transmission shaft 63) is the highest in one rotation. It is transmitted to the lower gears 81, 82, 83 (third transmission shaft 63) via the set of eccentric gears.

As described above, the planting arm 11 rushes into the field surface G in a state where the angular velocity of the power transmitted to the lower gears 81, 82, 83 (third transmission shaft 63) is the highest in one rotation. The phase at which the seedlings held by the planting arm 11 are separated from the planting arm 11 and planted on the field surface G is the above-mentioned specific phase in which the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 mesh with each other. is there.

(First alternative form of carrying out the invention)
In the inter-stock transmission 46, three or more sets of constant velocity gears of the upper gears 72 and 73 and the lower gears 82 and 83 may be provided, and the eccentric gears of the upper gear 71 and the lower gear 81 may be provided. A plurality of sets may be provided.

(Second alternative form of carrying out the invention)
In the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 of the planting clutch 48, the occlusal portions 86, 87, 88 are provided in the torque limiter 47 (spring receiving portion 75), and the openings 89, 90, 91 are provided. It may be provided in the clutch transmission portion 79 of the planting clutch 48.

Convex occlusal portions 86, 87, 88 may be provided on both the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 of the planting clutch 48.
Two sets of occlusal portions 86, 87, 88 and openings 89, 90, 91 may be provided, or four or more sets may be provided.
The openings 89, 90, 91 may be formed in a concave opening having a bottom instead of a penetrating opening.

(Third alternative form of carrying out the invention)
In the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 of the planting clutch 48, the interval W1 and the interval W2 are set to the same value so that the intervals W1 and W2 and the interval W3 are different. May be good.

(Fourth alternative form of carrying out the invention)
In the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 of the planting clutch 48, the length L1 (angle) of the occlusal portion 86 and the opening 89 and the length L1 (angle) of the occlusal portion 87 and the opening 90. ) And the length L1 (angle) of the occlusal portion 88 and the opening 91 may all be set to be different, or may be set to be partially different.

According to this configuration, even if the intervals W1, W2, and W3 are all set to be the same, the torque limiter 47 (spring receiving portion 75) and the clutch transmission portion 79 can be occluded in a specific phase in the planting clutch 48. ..

The present invention applies not only to a riding-type rice transplanter, but also to a working machine such as a riding-type direct sowing machine equipped with a sowing device (corresponding to a working device) (not shown) for supplying seeds to the rice field G at predetermined intervals. It can be applied to a work machine not equipped with the ground leveling device 8.

3 Aircraft 6 Seedling planting device (working device)
11 Planting arm 13 Seedling stand 46 Inter-stock transmission (interval transmission)
47 Torque limiter 48 Implanted clutch 49 Output shaft 61 1st transmission shaft 61a End of 1st transmission shaft 62 2nd transmission shaft 63 3rd transmission shaft 63a End of 3rd transmission shaft on the 1st transmission shaft side 63c Stop 65 Shift member 65c Recessed 67 Key member (shift operation unit)
68 Shift operation shaft (shift operation unit)
71 Upper side gear 72 Upper side gear 73 Upper side gear 74 Stopper part 75 Spring receiving part 76 Upper side transmission part 77 Lower side transmission part 78 Limiter spring 79 Clutch transmission part 80 Clutch spring 81 Lower side gear 81a Spline part 81b Recess 82 Lower Side gear 83 Lower side gear 83a Spline part 84 Clutch operation part 85 Clutch stop part 86 Biting part 87 Biting part 88 Biting part 89 Opening part (bite part)
90 Opening (occlusal part)
91 Opening (occlusal part)
G field (field)
W1 interval W2 interval W3 interval

Claims (10)

A work device that supplies agricultural materials to the field while opening a supply interval along the traveling direction of the aircraft as the aircraft progresses.
It is provided with an interval transmission that changes the supply interval by shifting the power transmitted to the work device.
In the interval transmission
The first transmission shaft to which power is transmitted, the second transmission shaft supported in parallel with the first transmission shaft and to which the power of the first transmission shaft is transmitted, and the end of the first transmission shaft are in contact with each other. In the state, the third transmission shaft supported concentrically with the first transmission shaft,
A plurality of upper gears supported by the second transmission shaft, and a plurality of lower gears supported by the third transmission shaft.
One set of the plurality of upper gears and the lower gears is selected, and the power of the second transmission shaft is transmitted through the upper gears and the lower gears of the selected set. A gear shifting operation unit is provided so as to be transmitted to the third transmission shaft.
The stopper portion for stopping the movement of the lower gear to the first transmission shaft side is formed separately from the third transmission shaft, and is attached to the end portion of the third transmission shaft on the first transmission shaft side. The installed work machine. The working machine according to claim 1, wherein the lower gear that the stopper portion contacts and stops is provided with a recess that allows the stopper portion to enter the lower gear. In the interval transmission
A shift member is provided which is integrally rotatable and slidably attached to the first transmission shaft to shift the power transmitted from the first transmission shaft to the second transmission shaft.
The working machine according to claim 1 or 2, wherein the end of the shift member on the third transmission shaft side is provided with a recess into which the end of the third transmission shaft on the first transmission shaft side can enter. .. Spline portions are formed on one and the other of the adjacent lower gears.
Another lower gear is attached between one and the other lower gear so as to occlude over the spline portion of one of the lower gears and the spline portion of the other lower gear.
The working machine according to any one of claims 1 to 3, wherein a plurality of the lower gears are integrally rotatably attached to the third transmission shaft. A torque limiter provided at a portion opposite to the lower gear on the third transmission shaft on the opposite side of the first transmission shaft to transmit the power of the lower gear to the working device is provided.
To the torque limiter
A spring receiving portion provided on the third transmission shaft so as to be arranged on a portion of the torque limiter opposite to the lower gear.
An upper transmission unit that can rotate integrally with the lower gear,
A lower-hand side transmission portion slidably supported by the third transmission shaft over a position where the upper-side transmission portion is occluded and a position where the upper-side transmission portion is separated from the spring receiving portion side.
A limiter spring is provided so as to extend over the lower transmission portion and the spring receiving portion to urge the lower transmission portion to the upper transmission portion.
The one according to any one of claims 1 to 4, wherein a stop portion that supports the spring receiving portion and receives the urging force applied from the limiter spring to the spring receiving portion is provided on the third transmission shaft. Work machine. The working machine according to claim 5, wherein the stop portion is integrally formed with the third transmission shaft. The working device is rotationally driven so as to take out the seedlings, which are agricultural materials, from the lower part of the seedling stand, and to plant the seedlings on the rice field surface while opening the stocks at the supply interval along the traveling direction of the machine. It is a seedling planting device equipped with a planting arm.
The interval transmission is an inter-strain transmission that shifts the power transmitted to the seedling planting device to change between the stocks, and is used in a plurality of pairs of the upper gear and the lower gear.
The upper gear and the lower gear are composed of constant speed gears, and the power of the second transmission shaft is changed while maintaining the angular velocity in one rotation of the power of the second transmission shaft at a constant speed. Then, the set of constant velocity gears transmitted to the third transmission shaft and
The upper gear and the lower gear are composed of eccentric gears, and the power of the second transmission shaft is rotated in the same manner while shifting the angular speed in one rotation of the power of the second transmission shaft to high or low. A set of eccentric gears that transmit to the third transmission shaft by number is provided.
A planting clutch arranged on the opposite side of the lower gear with respect to the torque limiter and transmitting the power of the torque limiter.
The planting clutch is provided, and is provided with an output shaft which is arranged concentrically with the third transmission shaft and transmits the power of the planting clutch to the seedling planting device.
To the planting clutch
A clutch transmission unit that can rotate integrally with the output shaft and is slidably supported by the output shaft over a transmission position that meshes with the torque limiter and a cutoff position that is separated from the torque limiter.
A clutch spring that urges the clutch transmission unit to the transmission position,
A clutch operating unit capable of operating the clutch transmission unit at the shutoff position is provided against the clutch spring.
The shapes of the torque limiter and the clutch transmission portion are set so that the torque limiter and the clutch transmission portion mesh with each other only in one preset specific phase.
In a state where the set of eccentric gears is selected by the speed change operation unit, the specific phase is planted in a state where the angular velocity of the power transmitted to the third transmission shaft is the highest in one rotation. The working machine according to claim 5 or 6, wherein the attached arm rushes into the rice field surface, and the seedlings held by the planting arm are set to a phase in which they are planted on the rice field surface away from the planting arm. A plurality of occlusal portions are provided in the torque limiter and the clutch transmission portion.
The position where the occlusal portion of the torque limiter and the occlusal portion of the clutch transmission portion occlude is the transmission position, and the position where the occlusal portion of the torque limiter and the occlusal portion of the clutch transmission portion are separated from each other is the blocking position. And
By setting the distance between the adjacent occlusal portions in the rotational direction to be different from the distance between the adjacent occlusal portions in the rotational direction, the torque limiter and the clutch transmission portion can be moved to the above-mentioned. The working machine according to claim 7, wherein the working machine engages only in a specific phase. The occlusal portion of the clutch transmission portion is formed in a convex shape protruding toward the torque limiter side.
The occlusal portion of the torque limiter is an opening opened in a portion between the center and the outer peripheral portion of the torque limiter.
The position where the occlusal portion of the clutch transmission portion enters the opening of the torque limiter and engages is the transmission position, and the position where the occlusal portion of the clutch transmission portion escapes from the opening of the torque limiter is the blocking. The working machine according to claim 8, which is a position. The working machine according to any one of claims 7 to 9, further comprising a clutch stop portion for stopping the clutch transmission portion from moving to the torque limiter side beyond the transmission position by the clutch spring. ..

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