JP2015123046A - Seedling transplanting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seedling transplanting machine that automatically adjusts adequate planting depth of a seedling according to depth of field or hardness of soil and automatically adjusts and supplies adequate amount of fertilizer.SOLUTION: A seedling transplanting machine includes a traveling vehicle body 20 provided with a seedling tank 60a in a freely elevating/lowering manner, a seedling transplanting device 60b that transplants seedling, a fertilizing device 60c that supplies fertilizer, and a main transmission shaft 10 that transmits drive force to a traveling device 21 of the traveling vehicle body 20, and a suspension mechanism 130 formed of an upper case 110 that covers the main transmission shaft 10, a lower case 120 slidably and swingably provided to the upper case 110, and a spring 131 that absorbs upper/lower movements of the travelling device 21. The seedling transplanting machine is provided with an upper/lower movements detecting member 151, 155 that detects an amount of the upper/lower movements of the travelling device 21, and a control device 150 that elevates and lowers the seedling tank 60a in accordance with the amount of the upper/lower movements of the travelling device 21 detected by the upper/lower movements detecting member 151, 155.

Description

  The present invention relates to a seedling transplanting machine that supplies fertilizer while transplanting seedlings in a field.

In a seedling transplanter, there is a technology to detect changes in the depth of the field by turning the center float up and down provided at the bottom of the seedling tank, and to raise and lower the seedling tank to align the seedling planting depth for each place in the field . (See Patent Document 1.)
In addition, information such as fertilizer concentration, water temperature, and field depth in the field is detected by sensors provided in each part of the machine, and the amount of fertilizer supplied from the fertilizer application is changed for each field location based on the detected information. There is technology to do. (See Patent Document 2.)

JP2012-55287A JP 2013-146219 A

  However, the center float described in Patent Document 1 moves along the topsoil of the field, tends to detect a depth different from the actual field depth, the seedling planting depth becomes too shallow, May be washed away by wind or water, and the seedlings may be planted too deeply, so that the seedlings may not receive sufficient sunlight and grow slowly.

  Also, depending on the depth of the field, there are places where the fertilizer is easy to reach in the soil and places where it is difficult to reach, but if a depth different from the actual field depth is detected, the fertilizer necessary for seedling growth will be insufficient. There is a problem that the growth of some seedlings is slowed down, so that topdressing work and harvesting work cannot be performed in a planned manner, and there is a problem that the quality of the harvest obtained after growing the seedlings deteriorates due to excessive fertilizer.

  Since the sensor for detecting the depth of the field described in Patent Document 2 measures the depth with ultrasonic waves or the like, it is possible to obtain a more accurate depth than the contact method of the center float. However, if the mud in the field rises due to the aircraft running, seedling planting, etc., the raised mud impedes accurate measurement, so an incorrect field depth may be detected depending on the field conditions, There is a problem that the depth and fertilizer application amount do not match, causing poor growth and reduced quality of the harvest.

  Furthermore, since the seedling transplanter of Patent Document 1 cannot change the planting depth in accordance with the hardness of the field, the planting depth of the seedling becomes too shallow at places where the soil soil is hard, In addition to the problem of being washed away by the water stream, the planting depth of the seedlings may become too deep in areas where the soil quality is soft, so that the seedlings may not receive sufficient sunlight and may grow slowly.

  In addition, since the seedling transplanter of Patent Document 2 cannot increase or decrease the amount of fertilizer application according to the hardness of the field, it is easy to cause a shortage of fertilizer in a hard field where the fertilizer does not easily penetrate, and the field where the fertilizer easily penetrates. There is a problem that excessive fertilizer tends to occur in soft places, causing poor growth and reduced quality of the harvest.

  An object of the present invention is to provide a seedling transplanting machine that automatically adjusts the appropriate seedling planting depth in accordance with the depth of the field and the hardness of the soil, and automatically adjusts and supplies an appropriate fertilizer amount. And

  The present invention according to claim 1 is a seedling planting device (60b) in which a seedling tank (60a) for loading seedlings is provided at the rear of the traveling vehicle body (20) so as to be movable up and down, and seedlings are taken from the seedling tank (60a) and planted. A fertilizer application device (60c) for supplying fertilizer near the seedling planting position of the seedling planting device (60b), a traveling device (21) on the traveling vehicle body (20), and the traveling device. (21) is provided with a main transmission shaft (10) for transmitting driving force, an upper case (110) covering the upper part of the main transmission shaft (10) is provided, and the traveling device ( 21) is provided with a lower case (120) that is slidable and rotatable, and a spring (131) that absorbs the vertical movement of the traveling device (21) is provided on the upper case (110) and the lower case (120). Suspension mechanism ( 30), a vertical movement detection member (151, 155) for detecting the vertical movement amount of the traveling device (21) from the vertical sliding amount of the lower case (120) is provided, and the vertical movement detection member The seedling transplanter is provided with a control device (150) for moving the seedling tank (60a) up and down in accordance with the amount of vertical movement of the traveling device (21) detected by (151, 155).

The present invention according to claim 2 is a seedling planting device (60b) in which a seedling tank (60a) for loading seedlings is provided at the rear of the traveling vehicle body (20) so as to be movable up and down, and seedlings are taken from the seedling tank (60a) and planted. A fertilizer application device (60c) for supplying fertilizer near the seedling planting position of the seedling planting device (60b), a traveling device (21) on the traveling vehicle body (20), and the traveling device. (21) is provided with a main transmission shaft (10) for transmitting driving force, an upper case (110) covering the upper part of the main transmission shaft (10) is provided, and the traveling device ( 21) is provided with a lower case (120) that is slidable and rotatable, and a spring (131) that absorbs the vertical movement of the traveling device (21) is provided on the upper case (110) and the lower case (120). Suspension mechanism ( In seedling transplantation machine having a 30),
Vertical movement detection members (151, 155) for detecting the vertical movement amount of the traveling device (21) from the vertical sliding amount of the lower case (120) are provided, and the traveling detected by the vertical movement detection members (151, 155). A seedling transplanter is provided, which is provided with a control device (150) for increasing or decreasing the fertilizer application amount of the fertilizer application device (60c) in accordance with the vertical movement amount of the device (21).

  According to a third aspect of the present invention, there is provided a steering member (51) for steering the traveling vehicle body (20), a steering detection member (161) for detecting a steering angle of the steering member (51), and the traveling device. A torque detection member (160) for detecting the running torque of (21) is provided, and the control device (150) is configured such that when the angle detected by the steering detection member (161) is a straight traveling operation angle, the torque detection member. The seedling transplanter according to claim 2, wherein the fertilizer application amount (60c) is increased or decreased in accordance with the running torque detected by (160).

  According to a fourth aspect of the present invention, there is provided a steering member (51) for steering the traveling vehicle body (20), a steering detection member (161) for detecting a steering angle of the steering member (51), and the traveling vehicle body. (20) A rear traveling device (22) is provided at the rear of the rear traveling device (22), and a rear transmission device (23) mounted with a rear transmission shaft (24) for transmitting a driving force to the rear traveling device (22) is provided. (24) is provided with a rear torque detecting member (162) for detecting a traveling torque of the rear traveling device (22), and the control device (150) is configured such that the angle detected by the steering detecting member (161) is a straight traveling operation angle. If it is, it is set as the seedling transplanter of Claim 2 which increases / decreases the fertilizer application amount of the said fertilizer application apparatus (60c) according to the running torque which a rear part torque detection member (162) detects.

  According to the present invention of claim 5, the control device (150) is configured such that the traveling torque of the traveling device (21) detected by the torque detecting member (160) and the rear traveling device detected by the rear torque detecting member (162). The average running torque of the traveling vehicle body (20) is calculated from the running torque of (22), and the fertilizer application amount of the fertilizer application (60c) is increased or decreased according to the average running torque. Or it is set as the seedling transplanting machine of 4.

  In the present invention of claim 6, the control device (150) acquires position coordinates from a GPS receiver (163) provided in the traveling vehicle body (20), and the seedling tank (60a) is obtained for each acquired position coordinate. Work information comprising the vertical position of the fertilizer, the fertilizer application amount of the fertilizer application device (60c), the vertical motion detection amount of the vertical motion detection members (151, 155), the running torque of the torque detection member (160) and the rear torque detection member (162). The seedling transplanter according to any one of claims 1 to 5, wherein the seedling transplanter is recorded.

  The present invention of claim 7 is provided with a front transmission shaft (21a) for transmitting a driving force from the lower case (120) to the traveling device (21), and the traveling device is provided at an end of the front transmission shaft (21a). A shaft support member (171) for mounting (21) is provided, a receiving groove (171a) is formed in the shaft support member (171), and a flange (170) is formed in the lower case (120). (170) It is set as the structure made to contact in a receiving groove (171a), It is set as the seedling transplanter of any one of Claim 1 to 6 characterized by the above-mentioned.

  According to the first aspect of the present invention, the change in the depth of the field can be detected from the vertical movement amount of the traveling device (21), and the vertical position of the seedling tank (60a) can be changed according to the depth of the field. The planting depth of the planting device (60b) becomes too shallow, so that the seedlings are prevented from being washed away by wind or water flow, and the number of seedlings that are wasted is reduced.

Moreover, since it can prevent that the planting depth of a seedling planting apparatus (60b) becomes deep too much, a seedling can fully receive sunlight and can grow and the growth of a seedling is stabilized.
And it is not necessary for the operator to change the planting depth of the seedling according to the depth of the field, and the operability and work efficiency are improved.

  The present invention of claim 2 can detect a change in the field depth from the vertical movement amount of the traveling device (21) and change the fertilization amount of the fertilizer application device (60c) according to the field depth. A lot of fertilizer is supplied to the shallow part of the plant, and the deterioration of the quality of the crop due to excessive fertilizer is prevented.

  And since sufficient fertilizer is not supplied to deep places and it can prevent the growth of seedlings due to lack of fertilizer, the growth of seedlings in the whole field is easy to arrange, and the spraying of chemicals after seedling planting and planning of harvest time This makes it easier to stand up and improves work efficiency.

  The fertilizer supplied to the field flows in the field due to wind and water convection.At this time, the fertilizer in the shallow part tends to move and the fertilizer tends to accumulate in the deep part. By increasing the supply amount of the fertilizer of the fertilizer application device (60c) and controlling the control device (150) to reduce the supply amount of the fertilizer in the deep part, the fertilizer concentration of the entire field can be made uniform after a lapse of time.

Furthermore, there is no need for the operator to increase or decrease the amount of fertilization according to the depth of the field, and operability and work efficiency are improved.
According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, the fertilizer application amount (60c) is increased or decreased in accordance with the traveling torque of the traveling device (21) detected by the torque detection member (160). By doing so, it is possible to automatically adjust to the supply amount of fertilizer according to the soil quality of the field, so that it is possible to prevent a shortage of fertilizer and an excessive amount of fertilizer.

  In areas where the running torque is high, the soil quality of the field is hard and the fertilizer is difficult to penetrate.By increasing the amount of fertilizer application, it is possible to prevent the fertilizer shortage and delay the growth of the seedling, as well as wind and water convection As a result, the fertilizer flows in a soft soil area, so that the fertilizer concentration of the entire field can be made uniform after a lapse of time, and the growth of the crops in the entire field becomes uniform.

  In areas where running torque is low, the soil quality of the field is soft and the fertilizer easily penetrates, so reducing the amount of fertilizer prevents deterioration of the quality of the crop due to excessive fertilizer, and the soil quality is reduced by wind and water convection. By receiving fertilizer flowing from a hard place, it can be made to have an appropriate fertilizer concentration, so that the fertilizer concentration of the entire field can be made uniform over time, and the growth of crops in the entire field becomes even .

In addition, it is not necessary for the operator to increase or decrease the amount of fertilization according to the hardness of the field, and operability and work efficiency are improved.
According to the present invention of claim 4, in addition to the effect of the present invention of claim 2, the fertilizer application amount of the fertilizer application (60c) in accordance with the traveling torque of the rear traveling device (22) detected by the rear torque detecting member (162). By increasing / decreasing the value, it is possible to automatically adjust to the amount of fertilizer supplied according to the soil quality of the field, so that it is possible to prevent a shortage of fertilizer and an excessive amount of fertilizer.

  In areas where the running torque is high, the soil quality of the field is hard and the fertilizer is difficult to penetrate.By increasing the amount of fertilizer application, it is possible to prevent the fertilizer shortage and delay the growth of the seedling, as well as wind and water convection As a result, the fertilizer flows in a soft soil area, so that the fertilizer concentration of the entire field can be made uniform after a lapse of time, and the growth of the crops in the entire field becomes uniform.

  In areas where running torque is low, the soil quality of the field is soft and the fertilizer easily penetrates, so reducing the amount of fertilizer prevents deterioration of the quality of the crop due to excessive fertilizer, and the soil quality is reduced by wind and water convection. By receiving fertilizer flowing from a hard place, it can be made to have an appropriate fertilizer concentration, so that the fertilizer concentration of the entire field can be made uniform over time, and the growth of crops in the entire field becomes even .

In addition, it is not necessary for the operator to increase or decrease the amount of fertilization according to the hardness of the field, and operability and work efficiency are improved.
Further, by providing the rear torque detection member (162) near the rear transmission shaft (24) provided on the rear transmission member (23), it is possible to change the depth of the field, or turn the traveling vehicle body (20). Since the traveling torque of the rear traveling device (22) whose vertical position is unlikely to change can be detected, the soil quality of the field can be accurately detected regardless of the traveling state, and a more appropriate amount of fertilizer is supplied to the field Therefore, the occurrence of fertilizer tribes and excessive fertilizer is prevented.

  According to the fifth aspect of the present invention, in addition to the effect of the third or fourth aspect of the present invention, the control device (150) averages the running torque detected by the torque detecting member (160) and the rear torque detecting member (162). By changing the fertilizer amount of the fertilizer application device (60c) based on this averaged running torque, the fertilizer tribe and the fertilizer tribe can be changed more accurately by detecting the soil quality and hardness of the field. The occurrence of excessive fertilizer is prevented.

Moreover, it is prevented that an excess fertilizer is supplied to a farm field, and the consumption of a fertilizer is suppressed.
According to the sixth aspect of the present invention, in addition to the effect of the present invention according to any one of the first to fifth aspects, the position information obtained by the control device (150) from the GPS receiving device (163) and the seedling tank (60a) ), The fertilizer application amount of the fertilizer application device (60c), the vertical motion detection amount of the vertical motion detection members (151, 155), and the running torque detected by the torque detection member (160) and the rear torque detection member (162). By recording the work information, it is possible for the worker to confirm what kind of work has been performed on the field, making it easier to perform appropriate maneuvers during the next work, improving work efficiency, Improves application accuracy and fertilization accuracy.

  In addition, the amount of seedlings and fertilizer consumed can be easily grasped, so it is easy to determine the amount of seedlings and fertilizer to be prepared in the next and subsequent work, and systematic work can be performed. Improvement, reduction of work labor and work cost can be achieved.

  In addition to the effect of the present invention of any one of claims 1 to 5, the present invention of claim 7 is provided in the lower case (120) in the receiving groove (171a) formed in the shaft support member (171). By attaching the traveling device (21) with the flange (170) to be formed in contact, foreign matter such as sawdust can be wound around the flange (170), so that the front transmission shaft (21a) is contaminated. It is possible to prevent the object from being wound, and to reduce the time and labor required for removing the impurities.

Left side view of seedling transplanter Top view of seedling transplanter Schematic cross section near the front wheel on the left side of the seedling transplanter Schematic cross section near the front wheel on the left side of the seedling transplanter Partial enlarged sectional view of the traveling transmission case in which the outer diameter of the stepped portion is equal to or larger than the outer diameter of the first bearing member. Partial enlarged sectional view of the traveling transmission case in which the auxiliary bearing member is disposed outside the stepped portion. Partial enlarged sectional view of a traveling transmission case in which through holes and recesses are formed in the liner Partial enlarged sectional view of the traveling transmission case in which the groove in which the packing is disposed is formed in the outer peripheral edge of the upper spring receiving member Partial enlarged cross-sectional view of a traveling transmission case in which the lower case has radiating fins and oil retaining ribs Partial enlarged cross-sectional view of a traveling transmission case in which the lower case has radiating fins and oil retaining ribs Partial enlarged sectional view of a traveling transmission case of a work vehicle Partially enlarged sectional view of a traveling transmission case in which a suspension rod packing provided twice is provided together with a suspension duster strip. Partial enlarged sectional view of a traveling transmission case in which a breather for adjusting the pressure in the upper case is provided with an oil filler port for injecting oil into the upper case. Partial enlarged sectional view of a drive transmission case with an upper case drain plug in the upper case and a lower case drain plug in the lower case Partial enlarged sectional view of the transmission case with a potentiometer that detects the vertical movement of the front wheel by detecting the expansion and contraction of the suspension mechanism Partial enlarged sectional view of the transmission case provided with a stroke sensor that detects the vertical movement of the front wheel by detecting the expansion and contraction of the suspension mechanism Block diagram showing each member related to control based on field conditions such as field depth and field hardness Flow chart showing planting depth control and increase / decrease control of fertilization amount by operation of suspension mechanism Another example flowchart showing planting depth control and fertilizer application increase / decrease control by operation of suspension mechanism Flow chart showing increase / decrease control of fertilizer amount according to the hardness of the field by detection of front torque sensor Flow chart showing increase / decrease control of fertilizer application amount according to farm hardness by detection of rear torque sensor Flowchart showing increase / decrease control of fertilizer amount according to the hardness of the field detected from the average running torque value of the front and rear torque sensors Flow chart showing planting depth control and fertilizer application increase / decrease control by suspension mechanism operation and torque sensor detection (A) Partial enlarged cross-sectional view showing that the flange has an eccentric shape, (b) Partial enlarged cross-sectional view showing that an edge is formed at the flange end, and (c) That a sawtooth portion is formed at the flange end. Partial enlarged sectional view Partial enlarged sectional view showing another configuration of the case cover Partial enlarged cross-sectional view with a through hole formed in the case cover

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration and operation of the work vehicle according to the present embodiment will be specifically described with reference to FIGS.

FIG. 1 is a schematic left side view of a work vehicle according to an embodiment of the present invention, and FIG. 2 is a schematic top view of the work vehicle according to the embodiment of the present invention.
The front wheels 21 and 21 of the present embodiment are examples of the traveling device of the present invention, and the engine 30 is a means for generating power for driving the front wheels 21 and 21 and the rear wheels 22 and 22. is there.

  The traveling transmission case 100 is a means for transmitting driving force to the front wheels 21, 21, the main frame 40 is a means for mounting the traveling vehicle body 20, and the steering unit 50 is determined by the operator. The work unit 60 is a means for operating the work vehicle, and the work unit 60 is a means for performing farm work in the field.

  The work unit 60 shown in FIGS. 1 and 2 is provided at the rear part of the traveling vehicle body 20 so as to be movable up and down. The seedling tank 60a is configured to be capable of loading a plurality of seedlings, and seedlings are taken from the seedling tank 60a. A seedling planting device 60b planted in the field for each line and a fertilizer application device 60c for supplying fertilizer to the vicinity of the field scene where the seedling planting device 60b planted seedlings are configured.

  In addition, the planting depth of the seedling by changing the vertical position of the seedling tank 60a, the amount of seedlings planted at one time by the seedling planting device 60b, the distance between the seedlings to be planted, and the fertilizer supplied by the fertilizer 60c The amount can be arbitrarily changed by the operator according to the working conditions, and the seedling planting depth, seedling planting amount, seedling planting interval based on the detection results of sensors provided in each part of the aircraft The fertilizer application amount may be automatically controlled.

Of course, the traveling device of the present invention may be a wheel such as a rear wheel different from the front wheel, or may be a traveling device such as a crawler that is not a wheel.
Next, the configuration and operation of the work vehicle of the present embodiment will be described more specifically with reference mainly to FIGS.

FIGS. 3 and 4 shown here are schematic cross-sectional views (parts 1 and 2) in the vicinity of the left front wheels 21 and 21 of the work vehicle according to the embodiment of the present invention.
In FIG. 3, the lower case 120 slides so as to be closest to the upper case 110, and in FIG. 4, the lower case 120 slides so as to be most separated from the upper case 110. It is moving.

In addition, the kingpin shaft 10 of this Embodiment is an example of the main transmission shaft of this invention.
A suspension mechanism 130 is provided in the traveling transmission case 100 for transmitting the driving force to the front wheels 21 and 21 for suppressing the influence of vertical movement due to the unevenness of the field.

  The traveling transmission case 100 is an upper and lower final case, and is configured by combining an upper case 110 and a lower case 120. The lower case 120 is attached to the upper case 110 so as to be rotatable when the front wheels 21 and 21 are steered.

More specifically, the lower case 120 is provided so as to be slidable and rotatable with respect to the upper case 110 together with the kingpin shaft 10.
A sleeve 122 of the lower case 120 is provided at a sliding portion between the lower case 120 and the upper case 110, and an upper case 110 is provided at a sliding portion between the kingpin shaft 10 and the upper case 110. The liner 111 is provided.

The driving force from the engine 30 is transmitted to the front wheels 21 and 21 through bevel gears 31, 32, 33 and 34.
Therefore, oil such as grease is injected into the traveling transmission case 100 to suppress seizure and wear due to the operation of the kingpin shaft 10, the suspension mechanism 130, and the bevel gears 31, 32, 33 and 34.

In addition, how the driving force is transmitted from the engine 30 is as follows.
The rotational force from the upper case input shaft 35 rotates the bevel gear 31 fixed to the tip thereof. Reference numeral 147 denotes an input shaft bearing member for bearing the tip of the upper case input shaft 35.

  The bevel gear 31 meshes with the bevel gear 32. The bevel gear 32 is supported by a kingpin shaft upper end bearing member 148 fixed to the upper case 110, and the kingpin shaft 10 is movable in a vertical direction in a spline groove 10a formed on the upper surface of the kingpin shaft 10. Are connected. Reference numeral 12 denotes a meshing protrusion which is a protrusion of the spline groove 10a.

Therefore, the driving force from the engine 30 can rotate the kingpin shaft 10. Reference numeral 10b denotes a stopper for preventing the slipping.
Next, the configuration and operation of the work vehicle according to the present embodiment will be described more specifically with reference mainly to FIGS. 1 to 4.

As described above, the traveling vehicle body 20 includes the left and right front wheels 21 and 21, and the left and right front wheels 21 and 21 include the kingpin shafts 10 and 10 that transmit driving force, respectively.
The traveling transmission case 100 includes an upper case 110, a lower case 120, and a suspension mechanism 130.

  The upper case 110 covers the upper part of the kingpin shaft 10 and is infused with oil. The lower case 120 is a case that is provided so as to be slidable and rotatable with respect to the upper case 110 and that covers the lower part of the kingpin shaft 10 and in which oil and fat is injected. The suspension mechanism 130 is a mechanism including a spring 131 that moves the left and right front wheels 21 and 21 up and down in accordance with the unevenness of the field. Further, the first bearing member 141 is a bearing member that is disposed in the stepped portion 11 of the kingpin shaft 10 and has a sealing function.

  Thus, the 1st bearing member 141 which is a seal bearing with a dustproof structure is provided, and the clearance gap between the upper case 110 with which the main frame 40 is mounted | worn, and the lower case 120 is narrow.

  Therefore, the mud and water that have entered the upper case 110 or the lower case 120 are less likely to move between the upper case 110 and the lower case 120, and the time and labor required for maintenance work to remove the mud and water are reduced.

  And since the movement of the oil and fat which is the lubricant supplied to the upper case 110 and the lower case 120 is suppressed by the first bearing member 141, the oil and fat used in the upper case 110 and the oil and fat used in the lower case 120 are It can be different.

For example, a combination of grease having a relatively high viscosity and oil having a relatively low viscosity, or a combination of a high viscosity grease and a low viscosity grease can be used.
More specifically, by using RBB (Rubber Ball Bearing) which is a seal bearing as the first bearing member 141 on the lower side of the stepped portion 11 of the kingpin shaft 10, the upper side and the lower side are separated (1 ) Reduction ratio and torque change are relatively large and high temperature is likely to occur, but oil and oil take-out is difficult to occur. On the lower side including the bevel gear chamber, the oil bath is made of oil with relatively low viscosity and easy handling. Alternatively, grease is filled with low-viscosity grease. (2) The reduction ratio and torque change are relatively small, and high temperatures are unlikely to occur. The grease is filled with relatively high grease.

Therefore, the contamination of the field due to leakage of oil and fat in the traveling transmission case 100 is suppressed.
The axle 21a is a shaft that drives the front wheels 21 and 21 by the transmitted driving force. The second bearing member 142 and the third bearing member 143 are bearing members that receive the axle 21a. Of the second bearing member 142 and the third bearing member 143, the second bearing member 142 on the front wheels 21 and 21 side has a sealing function.

As described above, the second bearing member 142 which is a seal bearing having a dustproof structure is provided on the axle 21a on which the lower case 120 rotates.
Therefore, the oil in the lower case 120 is less likely to leak to the outside, and contamination of the field due to the oil leak is suppressed.

And since mud and water do not easily enter the lower case 120 via the axle 21a, time and labor required for maintenance work for removing mud and water are reduced.
The fourth bearing member 144 is a bearing member having a sealing function, which is disposed below the lower spring receiving member 123 provided below the spring chamber 132 that houses the spring 131. The fifth bearing member 145 is an open type bearing member that is disposed on the upper side of the upper spring receiving member 112 provided on the upper side of the spring chamber 132.

  As a result, the internal pressure of the spring chamber 132 does not rise too much when the suspension mechanism 130 is moved up and down, making it difficult for oil and fat in the spring chamber 132 to leak to the outside, and suppressing contamination of the field due to oil leakage. Is done.

  Furthermore, since the possibility that an increase in the load on the fourth bearing member 144, which is a seal bearing having a dustproof structure, is increased due to an increase in the internal pressure of the spring chamber 132, the durability of the fourth bearing member 144 is maintained. The contamination range in the transmission case 100 is not widened, and the efficiency of maintenance work is improved.

Furthermore, since mud and water are less likely to enter the traveling transmission case 100, labor required for cleaning the traveling transmission case 100 is reduced, and deterioration of oil and fat is also suppressed.
As shown in FIG. 5, the outer diameter D of the stepped portion 11 of the kingpin shaft 10 may be equal to or larger than the outer diameter D1 of the first bearing member 141.

  FIG. 5 is a schematic partial enlarged cross-sectional view of a traveling transmission case 100 for a work vehicle according to another embodiment in which the outer diameter D of the stepped portion 11 is equal to or larger than the outer diameter D1 of the first bearing member 141 in the present invention. FIG.

  Since the stepped portion 11 of the kingpin shaft 10 whose outer diameter D is equal to or larger than the outer diameter D1 of the first bearing member 141 functions as an oil and fat reservoir, oil such as grease enclosed in the upper portion of the first bearing member 141 Flowing downward is suppressed.

  Of course, as shown in FIG. 6, the outer diameter D of the stepped portion 11 of the kingpin shaft 10 is substantially the same as the inner diameter D2 of the first bearing member 141, and the auxiliary bearing member 146 having a sealing function is provided by the stepped portion 11. It may be arranged on the outside.

  FIG. 6 is a schematic partial enlarged sectional view of the traveling transmission case 100 of the work vehicle according to another embodiment in which the auxiliary bearing member 146 is arranged outside the stepped portion 11 in the present invention. is there.

The fifth bearing member 145 may be a bearing member having a sealing function.
That is, the fifth bearing member 145 that is a seal bearing having a dustproof structure may be provided on the upper side of the spring chamber 132 of the suspension mechanism 130.

  This makes it difficult for mud and water to enter the spring chamber 132, thereby preventing the spring 131 from being damaged, and improving the absorption efficiency of unevenness in the field by the suspension mechanism 130.

And since the influence of the unevenness | corrugation of a field is absorbed efficiently and an airframe becomes difficult to shake, the improvement of work precision and reduction of the operator's fatigue by a shake are achieved.
Furthermore, if mud and water adhere to the meshing of the bevel gears 31 and 32 at the top of the suspension mechanism 130, transmission loss and gear damage due to slip are likely to occur, but when mud and water enter the spring chamber 132, Since the fifth bearing member 145 restricts the movement of mud and water to the upper end of the upper case 110 and the transmission of the kingpin shaft 10 is less likely to be disturbed, the traveling speed and posture of the aircraft are stabilized.

  Note that the input shaft bearing member 147 may be a bearing member having a sealing function, and an oil bath may be formed on the portion of the upper case input shaft 35 where the bevel gear 31 is disposed at the end.

  Of course, when the oil bath is formed on the portion of the upper case input shaft 35, a bearing member having a sealing function is provided in addition to the input shaft bearing member 147 so as to surround the portion where the oil bath is formed. Further arranged.

The upper case 110 has a liner 111 arranged on the upper side of the suspension mechanism 130 for adjusting the posture of the kingpin shaft 10.
In the present embodiment, the liner 111 is configured integrally with the upper spring receiving member 112.

It can be suppressed by the support by the liner 111 that the transmission efficiency is lowered due to the disorder of the posture of the kingpin shaft 10, and the running performance is stabilized.
As shown in FIG. 7, the liner 111 may be formed with a through hole 111 a in the longitudinal direction of the kingpin shaft 10 and a recess 111 b.

  FIG. 7 is a schematic partial enlarged cross-sectional view of a traveling transmission case 100 of a work vehicle according to another embodiment in which a through hole 111a and a recess 111b are formed in the liner 111 according to the present invention.

Of course, the liner 111 may be formed with at least one of the through hole 111a and the recess 111b.
In other words, at least one of the through-hole 111a or the recess 111b is formed between the liner 111 and the kingpin shaft 10, and the fats and oils to such an extent that there is almost no risk of impairing the strength of the traveling transmission case 100 that requires durability. The communication part may be formed.

  The internal pressure of the spring chamber 132 changes when the vertical movement by the action of the suspension mechanism 130 is performed, but the oil and fat can easily move, and the oil and fat in the upper case 110 is difficult to leak to the outside. Contamination of the field due to outing is suppressed.

  In addition, since a large change in the internal pressure of the spring chamber 132 is suppressed, even when the traveling transmission case 100 is submerged, it becomes difficult for water to be sucked into the traveling transmission case 100. The labor required for cleaning is reduced and the deterioration of fats and oils is also suppressed.

  Further, the risk that an increase in the load on the fourth bearing member 144, which is a seal bearing having a dustproof structure, is increased due to an increase in the internal pressure of the upper case 110, and the durability of the fourth bearing member 144 is maintained. The contamination range in the transmission case 100 is not widened, and the efficiency of maintenance work is improved.

A plurality of meshing protrusions 12 in the longitudinal direction of the kingpin shaft 10 are formed on the surface of the kingpin shaft 10 in contact with the liner 111.
One or more of the plurality of meshing protrusions 12 are removed.

  In this way, one or more of the plurality of meshing projections 12 formed by spline processing or the like on the sliding portion between the liner 111 and the kingpin shaft 10 are removed, and the traveling transmission case 100 in which durability is required. The oil and fat communication portion is formed to such an extent that there is almost no risk of impairing the strength.

  Accordingly, the internal pressure of the spring chamber 132 changes when the suspension mechanism 130 is moved up and down by the action of the suspension mechanism 130. However, the oil and air can easily move, and the oil and fat in the upper case 110 hardly leaks to the outside. Contamination of the field due to leakage is suppressed.

  For example, when the fourth bearing member 144 having a sealing function is arranged below the lower end portion of the meshing protrusion 12 that is a spline-working round-up portion, the oil bath is formed below the fourth bearing member 144. Since the durability of the fourth bearing member 144 is maintained by responding to the change in the internal pressure of the spring chamber 132, the oil bath from the sliding portion between the lower case 120 and the upper case 110 is maintained. It is possible to suppress the removal of oils and fats accompanying the conversion.

  And the big change of the internal pressure of the spring chamber 132 is suppressed, and even when the traveling transmission case 100 is submerged, it becomes difficult for water to be sucked into the traveling transmission case 100. Therefore, labor required for cleaning the traveling transmission case 100 Is reduced, and the deterioration of fats and oils is also suppressed.

  Furthermore, since the possibility that an increase in the load on the fourth bearing member 144, which is a seal bearing having a dustproof structure, is increased due to an increase in the internal pressure of the spring chamber 132, the durability of the fourth bearing member 144 is maintained. The contamination range in the transmission case 100 is not widened, and the efficiency of maintenance work is improved.

  As shown in FIG. 8, a groove 112 a in which a packing 112 b that acts when the spring 131 contracts may be formed on the outer peripheral edge of the upper spring receiving member 112.

  FIG. 8 is a schematic part of the traveling transmission case 100 of the work vehicle according to another embodiment in which the groove 112a in which the packing 112b is disposed is formed in the outer peripheral edge portion of the upper spring receiving member 112 in the present invention. It is an expanded sectional view.

  That is, the thickness τ of the packing 112b that is the rod packing is set so as to act when the spring 131 of the suspension mechanism 130 contracts beyond a predetermined amount and the groove 112a is compressed due to the contraction force of the spring 131. It may be.

  The risk of oil and fat moving in large quantities as the spring 131 contracts is reduced, making it difficult for oil and fat in the spring chamber 132 to leak to the outside, and contamination of the field due to oil and oil leakage is suppressed.

  For example, when the lower case 120 slides so as to approach the upper case 110, even if the oil bath is formed below the fourth bearing member 144, the lower case 120 and It is possible to suppress oil and fat from being taken out from the sliding portion with the upper case 110 in accordance with the oil bath.

And since mud and water are less likely to enter the traveling transmission case 100, the labor required for cleaning the traveling transmission case 100 is reduced, and the deterioration of fats and oils is also suppressed.
The main frame fastening portion 41 that fastens the upper case 110 of the front axle to the main frame 40 may be configured using an elastic body such as a spring member.

A buffering effect is exhibited in which the load that is not absorbed by the spring 131 is absorbed by the main frame fastening portion 41.
The suspension mechanism 130 moves up and down due to the influence of unevenness in the field and stabilizes the traveling posture and planting posture of the aircraft, and when the sensors are attached to the suspension mechanism 130, the posture of the aircraft is It becomes possible to detect changes, the depth of the field, and the like.

  If the attitude of the aircraft, for example, the tilt angle in the front-rear direction or the left-right direction changes due to unevenness in the field, the distance between the work unit 60 such as a seedling planting device and the field scene changes, and an appropriate work height cannot be secured. In addition, the balance of the fuselage is disturbed, the traveling direction is changed minutely, and the operation of the control unit 50 is not directly reflected, and there is a problem that the operability is deteriorated.

  Moreover, it is necessary to change the seedling planting depth and fertilization amount according to changes in the depth of the field. For example, in a place where the planting depth is deep, the seedling cannot reach the soil of the farm scene and floats without being planted, or the fertilizer is diffused in the water and cannot penetrate into the soil, resulting in insufficient fertilizer. There is a problem that growth is slow.

  On the other hand, in places where the planting depth is shallow, if the planting depth is too deep, the seedlings will not receive enough sunlight, the growth will be slow, or the fertilizer will penetrate excessively into the soil, and the crop will become fertilizer There is a problem of growing in an excessive state and reducing the quality of the harvest.

  As a configuration for solving the above problem, as shown in FIG. 15, a potentiometer 151 is provided on the outer side of the upper case 110, and when the lower case 120 moves up and down by the operation of the suspension mechanism 130, the potentiometer 151 rotates. A configuration in which a push rod 152 for rotating the moving cam 151a is provided on the outer side of the lower case 120 is conceivable.

  As shown in FIGS. 17 and 18, the rotation angle detected by the potentiometer 151 is transmitted to the control device 150, and the control device 150 moves the seedling tank 60 a up and down based on the detected rotation angle. The cylinder 153 is expanded and contracted, and a fertilizer application amount switching motor 154 capable of forward / reverse rotation that increases or decreases the fertilizer application amount supplied to the field by the fertilizer application device 60c is operated. The lifting cylinder 153 and the fertilizer application amount switching motor 154 may be of any operation type as long as they correspond to the control by the control device 150, such as a hydraulic type and an electric type.

  When the rotation angle detected by the potentiometer 151 increases from a reference angle (for example, 45 degrees), the lower case 120 slides toward the upper case 110 against the urging force of the spring 131. Since there is, it can be judged that the field depth is shallow. When the field depth is shallow, the planting depth of the seedling needs to be shallower than usual and the amount of fertilization needs to be reduced than usual. Therefore, the control device 150 sets the lifting cylinder 153 in accordance with the detection angle of the potentiometer 151. The seedling tank 60a is raised by contraction, and the fertilizer application amount switching motor 154 is operated in the fertilizer application amount decreasing direction to reduce the fertilizer application amount supplied to the field by the fertilizer application device 60c.

  Note that the amount of contraction of the lifting cylinder 153 and the operating time of the fertilization amount switching motor 154 in the direction of decreasing the fertilization amount are in direct proportion to the amount of increase in the rotation angle detected by the potentiometer 151, and As the increase amount increases, the shrinkage amount increases, the seedling tank 60a rises, the operation time in the direction of decreasing the fertilizer application amount becomes longer, and the fertilizer application amount of the fertilizer application 60c decreases.

  On the other hand, when the rotation angle detected by the potentiometer 151 decreases from the reference angle, the lower case 120 is slid away from the upper case 110 by the biasing force of the spring 131. It can be determined that the depth is deeper. When the field depth is deep, the planting depth of the seedling needs to be deeper than usual and the amount of fertilization needs to be increased more than usual. Therefore, the control device 150 sets the lifting cylinder 153 in accordance with the detection angle of the potentiometer 151. The seedling tank 60a is lowered by being extended, and the fertilizer application switching motor 154 is operated in the fertilizer application direction to increase the fertilizer application amount supplied to the field by the fertilizer application 60c.

  The extension amount of the lifting cylinder 153 and the operating time of the fertilizer amount switching motor 154 in the direction of increasing fertilizer amount are directly proportional to the decrease amount of the rotation angle detected by the potentiometer 151, and the rotation angle It is assumed that the larger the decrease amount, the larger the extension amount, the lower the seedling tank 60a, the longer the operation time in the direction of increasing the fertilizer amount, and the greater the fertilizer application amount of the fertilizer application 60c.

  According to the above, when the field depth changes, the planting depth and the fertilization amount of the seedling are automatically set to the field depth without the operator performing the raising / lowering operation of the seedling tank 60a or the fertilizer application amount adjusting operation of the fertilizer application device 60c. Therefore, the planting accuracy of the seedling is improved, and by supplying an appropriate amount of fertilizer, the growth of the seedling and the quality of the harvested product are stabilized.

In addition, since the number of man-hours required for the operator can be reduced, the work efficiency and the operability of the machine body are improved.
Since the potentiometer 151 is provided on the outer side of the upper case 110, the space between the potentiometer 151 and the potentiometer 151 can be widened, and mud and water are less likely to be scattered on the potentiometer 151. Is prevented from being reduced or damaged.

  In the above work example, the fertilizer concentration of the entire field after the work can be made close to uniform. However, since the water stretched on the field flows due to wind and convection, the fertilizer concentration is biased over time. Since fertilizers are difficult to move when they flow into deeper fields, there is enough fertilizer to grow seedlings after a long time even if the amount of fertilizer applied at work is small. Can occur. On the other hand, since the fertilizer tends to be washed away from the shallow portion, if the amount of fertilizer applied is reduced too much, the fertilizer shortage may occur and the growth of the seedling may be delayed.

  In order to correspond to the above, as shown in FIG. 19, the fertilization amount adjusting motor 154 is not operated or the fertilization amount is decreased at a portion where the rotation angle detected by the potentiometer 151 is increased from the reference angle, or at a shallow field depth. The fertilizer application amount adjustment motor 154 is operated even at a deep field depth where the control device 150 performs control to operate in the direction but shorten the operation time, and the rotation angle detected by the potentiometer 151 decreases from the reference angle. It is good also as a structure which the control apparatus 150 performs control operated in the fertilization amount decreasing direction.

  With the above configuration, the fertilizer concentration in the shallow part is increased immediately after the work is finished, and the fertilizer concentration in the deep part is lowered, but if the fertilizer moves with the water stretched over the field over time, the fertilizer concentration of the entire field is The value is suitable for the depth, so that the growth of seedlings in the entire field is stabilized and the quality of the harvested product is improved.

In addition, since the amount of fertilizer applied as a whole decreases, the growth cost can be reduced.
In the above configuration, the field depth is determined from the push-pull rod 152 that moves up and down with the vertical movement of the lower case 120 and the rotation angle detected by the potentiometer 151 that is changed by the push-pull rod 152. In order to detect a change in field depth, a stroke sensor 155 may be provided across the upper case 110 and the lower case 120 as shown in FIG.

  The stroke sensor 155 can detect the expansion / contraction operation of the suspension mechanism 130 in a very fine unit by laser, electrostatic capacity, etc., and finely increase / decrease the seedling tank 60a and increase / decrease the fertilizer application amount of the fertilizer application device 60c. Therefore, the planting accuracy of seedlings and the amount of fertilization are optimized more precisely, so that the growth of seedlings and the quality of the harvest can be improved.

  However, since the seedling tank 60a is frequently moved up and down when it corresponds to a very fine depth change, the seedling tank 60a is moved up and down after the seedling planting depth is changed and planted, Conversely, the planting depth may be disturbed. Similarly, after the fertilizer application amount is changed, the fertilizer application amount change control is performed again in accordance with the depth of the field, and the fertilizer application amount may not match the field depth. Therefore, when the stroke sensor 155 is used, the amount of change in the field depth for increasing / decreasing the planting depth and fertilization amount of the seedling is estimated to be set to a larger value, or change control of the planting depth and fertilization amount is once performed. After that, if a control program such as not performing the next change control for a predetermined time is incorporated in the control device 150, only the effect can be obtained without causing a defect.

  Further, the problem with the stroke sensor 155 is that it is more accurate than the potentiometer 151 and can be easily damaged due to adhesion of mud or water, and is expensive.

  The suspension mechanism 130 is provided on each of the left and right sides so as to correspond to the vertical movement of the left and right front wheels 21 and 21, so that different field depths may be detected on the left and right sides of the machine body. At this time, the fertilizer application device 60c may be divided at least in the center in the left-right direction, and fertilizer adjustment motors 154 and 154 may be provided on the left and right sides, so that different amounts of fertilizer can be supplied on the left and right sides of the machine body. The driving force of the fertilizer application 60c is obtained from the left and right rear wheel gear cases 23, 23 that supply driving force to the left and right rear wheels 22, 22, respectively, via fertilizer transmission mechanisms (not shown). The left and right independent fertilization driving force can be secured with a relatively simple configuration.

  In addition, in fields where seedlings are planted, the remaining fertilizer supplied during previous seedling planting operations or cultivation of other crops, natural fertilizers generated by decomposition of sawdust and weeds, etc. Since the components are mixed, if the fertilizer amount is changed in accordance with the concentration of the mixed fertilizer, the fertilizer concentration becomes too thick, leading to poor growth and the consumption of excess fertilizer can be suppressed.

  Therefore, as shown in FIGS. 1 and 17, left and right electrode sensors 156 and 156 are provided to cover the inner sides of the left and right front wheels 21 and 21, respectively, and the resistance value of electricity flowing between the left and right electrode sensors 156 and 156 is provided. A configuration is conceivable in which control is performed so as to increase or decrease the amount of fertilization according to the detected electrical resistance value.

  When the fertilizer concentration in the soil is high, a highly conductive fertilizer component dissolves in a large amount in the water stretched on the field, so that the detected resistance value of electricity becomes low. At this time, the fertilizing amount adjusting motor 154 is operated to the fertilizing amount decreasing side to reduce the fertilizing amount supplied from the fertilizing device 60c.

  On the other hand, when the fertilizer concentration in the soil is low, there are few fertilizer components that dissolve in the water, and water and soil become resistors, and the detected electrical resistance value is high. At this time, the fertilizing amount adjusting motor 154 is operated to the fertilizing amount increasing side to increase the fertilizing amount supplied from the fertilizing device 60c.

  In addition, when the fertilizer application 60c has a configuration in which different fertilizer application amounts can be set on the left and right sides of the machine body, the left and right potentiometers 151 and 151 or the detection values of the stroke sensors 155 and 155 transmitted to the control device 150 are used. Therefore, the operating time to the fertilization amount decreasing side or the fertilizing amount increasing side of the left and right fertilization amount adjusting motors 154, 154 can be varied, so that the fertilizing amount suitable for the field depth in the left and right direction of the machine body can be obtained. As the fertilizer concentration in the field becomes constant, the growth of seedlings is stabilized, and the amount of fertilizer used is reduced.

  As shown in FIG. 17, the traveling vehicle body 20 is provided with an inclination sensor 157 for detecting the inclination angle in the front-rear direction and the left-right direction, and an acceleration sensor 158 for detecting the inclination in the front-rear direction and the left-right direction. 157 detects an angle at which the front side of the traveling vehicle body 20 can be regarded as being in a front rising inclination posture positioned above the rear side, or the acceleration sensor 158 can be regarded as having the traveling vehicle body 20 in a front upward inclination posture. When the potentiometer 151 or the stroke sensor 155 detects the expansion / contraction operation of the suspension mechanism 130 when the acceleration is detected, a notification device 159 such as a buzzer is activated.

  A plate that leans against the platform of a transport vehicle in an inclined position when the vehicle passes through the entrance of a field that is a slope, generally formed in the corner of the field, or when the vehicle is loaded onto a transport vehicle such as a truck. When the aircraft passes above, the suspension mechanism 130 expands and contracts because one of the left and right front wheels 21 and 21 floats in the air away from the entrance / exit of the field and the loading movement plate. Therefore, by warning the worker with the notification device 159, the worker can quickly notice the abnormality, and the safety of the work is improved.

  In addition, when moving the aircraft outside the field or when moving the aircraft to the loading platform of the transport vehicle, the seedling planting device 60b and the like provided in the lower portion of the seedling tank 60a should be prevented from being damaged due to contact with the ground. The seedling tank 60a is raised, but if the seedling tank 60a is raised too much, the balance of the fuselage is biased to the rear, so the front side of the traveling vehicle body 20 is lifted, and the left and right front wheels 21, 21 cannot be grounded. It may not be possible. When the left and right front wheels 21 and 21 are lifted, the left and right front wheels 21 and 21 are moved downward by the suspension mechanism 130 to some extent, but the downward movement amount is limited by the urging force of the spring 131. It cannot be prevented from floating from the field scene.

  In order to prevent the above-described problem, the control device 150 determines that the potentiometer 151 or the stroke sensor 155 is used when the inclination angle of the traveling vehicle body 20 detected by the inclination sensor 157 or the acceleration sensor 158 can be regarded as a forwardly rising posture. When the front wheel 21 descends from the reference value, that is, when it can be considered that the suspension mechanism 130 is extended, the lifting cylinder 153 is extended, the seedling tank 60a is moved downward to lower the center of gravity, and the traveling vehicle body 20 It is preferable to adopt a configuration that prevents the upward tilt.

  With the above configuration, the seedling tank 60a is automatically lowered even if the seedling tank 60a is moved up on the slope while the seedling tank 60a is raised too much, and the left and right front wheels 21 and 21 are lifted from the farm scene. Thus, the weight balance of the fuselage is changed, and the left and right front wheels 21 and 21 are returned to the grounding posture. Therefore, the traveling vehicle body 20 is prevented from being unable to move, the work efficiency is improved, and the traveling vehicle body 20 that has stopped traveling is prevented. It is not necessary to move the machine manually, and the labor of the worker is reduced.

  In addition to the above configuration, as shown in FIGS. 17 and 20, the upper case 110 is provided with a torque sensor 160 for detecting torque during the traveling of the front wheels 21, and the steering handle 51 constituting the steering unit 50 is provided with A handle potentiometer 161 for detecting an operation amount of the steering handle 51, that is, a steering angle is provided.

  When the steering angle detected by the steering potentiometer 161 is an angle that can be regarded as straight running (eg, 0 ± 5 degrees), the control device 150 adjusts to the torque value detected by the torque sensor 160. It is set as the structure which increases / decreases the fertilization amount of the fertilizer application 60c.

  The place where the torque value is detected to be high tends to be washed away before the fertilizer is absorbed because the soil is hard or the viscosity is high, and the fertilizer concentration may be insufficient with time. Therefore, when the torque detected by the torque sensor 160 is high, the control device 150 sets the detected torque value to the increase / decrease control of the fertilizer amount calculated based on the detected value of the potentiometer 151 or the stroke sensor 155. In addition, control to increase the amount of fertilizer shall be performed.

  On the other hand, the place where the torque value is detected to be low tends to absorb the fertilizer because the soil is soft, and there is a possibility that the fertilizer becomes excessive when the fertilizer flows in over time. Therefore, when the torque detected by the torque sensor 160 is low, the control device 150 sets the detected torque value to the increase / decrease control of the fertilizer amount calculated based on the detected value of the potentiometer 151 or the stroke sensor 155. At the same time, control to reduce the fertilizer application amount shall be performed.

  In addition, in fields where it is difficult to change from the state of fertilization during planting of seedlings even after a lapse of time, fertilizers that increase the amount of fertilization and detect low torque in places where high torque is difficult to absorb fertilizer It is good also as a structure which performs control which reduces the amount of fertilization in the place where is absorbed easily.

  According to the above, since it is possible to automatically adjust to an appropriate fertilization amount in accordance with the soil quality of the field in addition to the field depth, it is possible to stabilize the growth of the crop and improve the quality of the harvest, and the operator can apply the fertilizer. There is no need to make fine adjustments many times, improving operability and work efficiency.

  When the steering angle detected by the handle potentiometer 161 is not an angle that can be regarded as straight running, the front wheels 21 are directed from the straight direction to the inside of the body or the outside of the body, and higher torque is likely to be generated than during straight running. Further, it is preferable that the fertilizer application amount increase / decrease correction by the torque detected by the torque sensor 160 is not performed, and the fertilizer application amount increase / decrease that does not match the actual condition of the field can be prevented.

  When the fertilizer application device 60c is configured such that the left and right fertilization amount adjusting actuators 154 and 154 can set the left and right independent fertilization amounts, the left and right upper cases 110 and 110 are provided with torque sensors 160 and 160, respectively. In accordance with the torque detected by each of the torque sensors 160, 160, the left and right fertilization amounts may be changed according to the field depth on the left and right sides of the machine body and the soil quality of the field.

  Further, as shown in FIGS. 17 and 21, a rear torque sensor 162 is provided on a rear wheel axle 24 that transmits a driving force to the rear wheel 22 of the rear wheel gear case 23, and the steering that the handle potentiometer 161 detects is provided. When the handle turning angle of the handle 51 is an angle that can be regarded as straight running, the fertilizer application amount of the fertilizer application device 60c may be increased or decreased based on the torque detected by the rear torque sensor 162.

  Unlike the front wheel 21 provided with the suspension mechanism 130, the rear wheel 22 hardly moves up and down due to unevenness or soil quality of the farm field. Therefore, the rear wheel torque sensor 162 is provided on the rear wheel axle 24 that transmits driving force to the rear wheel 22. By providing it, it is possible to detect the hardness and softness of the soil in the field by receiving more accurate torque than the front wheel 21, and an appropriate amount of fertilizer is supplied for each place in the field, so that the growth of seedlings and the quality of the crops are improved. In addition, the amount of fertilizer used can be reduced.

  17 and 22, both the torque sensor 160 and the rear wheel torque sensor 162 are provided, and the torque values detected by the torque sensor 160 and the rear wheel torque sensor 162 are averaged by the control device 150. The fertilizer application amount adjustment motor 154 may be operated based on the averaged torque value.

  Further, based on the torque value obtained from the torque sensor 160 or the rear wheel torque sensor 162, or both the torque sensor 160 and the rear wheel torque sensor 162, the lifting cylinder 153 is expanded and contracted to move the seedling tank 60a up and down. The planting depth may be changed according to the hardness of the field.

  Specifically, in fields where the torque value is detected and the soil is hard, if the seedlings are planted deeply and the leaves are buried in the soil, the area where the leaves receive sunlight will be reduced, making it difficult to grow. The seedling tank 60a is raised by contracting 153 to reduce the seedling planting depth. As a result, the root part of the seedling is buried in the soil, but the leaf part is less likely to be buried in the soil, so that the entire leaf part receives sunlight and the seedling grows stably.

  On the other hand, in a field where the torque value is detected to be low and the soil quality is soft, if the seedlings are not planted deeply in the soil, the seedlings will be washed away by wind or water flow, that is, where the seedlings are not planted, that is, missing plants will occur. Therefore, the elevating cylinder 153 is extended to process the seedling tank 60a, and the seedling planting depth is increased. Thereby, since the root part of the seedling and the leaf part near the root part are buried in the soil, the seedling is less likely to flow even when subjected to wind or water flow, and the occurrence of a stock defect is prevented.

In addition, the flowchart shown in FIG. 23 has shown control of the planting depth and the amount of fertilization by the field depth and the hardness of the field.
In addition, as shown in FIG. 17, the traveling vehicle body 20 is provided with a GPS receiver 163 that receives GPS signals, and the position coordinate information acquired by the GPS receiver 163 is sequentially recorded in the control device 150. And in this position coordinate information, change in fertilizer amount by switching operation of the fertilizer amount adjustment motor 154, planting depth of seedlings by expansion and contraction of the lifting cylinder 153, field depth to be detected by the potentiometer 151 and the stroke sensor 155, Work information such as a torque value detected by the torque sensor 160 and the rear torque sensor 162 is associated and recorded in the control device 150.

  At this time, the position coordinate information and the work information recorded in the control device 150 are moved from the control device 150 to a terminal such as a personal computer or a tablet using a portable storage such as a memory card, a cable such as a cable, or wireless communication. If it is possible, it will be easy to confirm what kind of seedling planting and fertilization work has been performed in the field, and it will be easy to prepare appropriate amounts of seedlings and fertilizer at the next and subsequent work, making it easier to make work plans.

  In addition, when a method is used in which information is sequentially displayed and recorded on a portable terminal such as a tablet using wireless communication, it is possible to share work information with workers other than the worker who performs work on the field.

As shown in FIGS. 9 and 10, the lower case 120 may have heat dissipating fins 124 provided on the outer side and oil retaining ribs 125 provided on the inner side.
9 and 10 are schematic partial enlarged cross-sectional views of a traveling transmission case 100 of a work vehicle according to another embodiment in which the lower case 120 includes the heat dissipating fins 124 and the oil retaining ribs 125 according to the present invention. 2).

  9, the radiating fins 124 are provided at predetermined positions in the central portion of the lower case 120. In FIG. 10, the radiating fins 124 are provided at predetermined positions from the upper portion to the central portion of the lower case 120 and at predetermined positions at the lower portion. It is provided in the place.

Of course, the lower case 120 may have at least one of the heat radiation fins 124 and the oil retaining ribs 125.
As described above, the oil retaining rib 125 is provided so that the oil stays in the vertical direction and, for example, the high temperature due to the operation of the bevel gears 33 and 34 inside the lower case 120 is suppressed.

Therefore, the heat of the oil heated for the rotation of the kingpin shaft 10 or the like is efficiently air-cooled, and the possibility that the viscosity of the oil decreases is reduced.
And it becomes difficult for the oil and fat in the driving | running | working transmission case 100 to leak outside, and the contamination of the field by the oil leakage is suppressed.

Furthermore, wear of the kingpin shaft 10 is suppressed.
As shown in FIG. 11, the lower case 120 includes a lower case main body 121 and a sleeve 122 that is fixed to the upper portion of the lower case main body 121 and slides on the upper case 110.

FIG. 11 is a schematic partially enlarged cross-sectional view of a traveling transmission case 100 for a work vehicle according to an embodiment of the present invention.
A cut 122a formed at a part of the sleeve 122 at the lower end portion of the contact portion P between the lower case main body 121 and the sleeve 122, and a recess 122b formed at a part of the sleeve 122 at the center of the contact portion P are provided. It has been. Note that a gasket agent is applied to the contact portion P in advance.

  When the sleeve 122 is fixed, the gasket agent applied in advance accumulates in at least one of the cut 122a and the recess 122b to form the gasket 122c. Of course, at least one of the cut 122a and the recess 122b may be provided.

  In this way, the gap between the sleeve 122 that can be exchanged at the time of wear and the lower case body 121 for sliding and rotating the lower case 120 with respect to the upper case 110 is a cut 122a having a tapered surface. Or it is narrow with the gasket agent which accumulated in the hollow 122b.

Accordingly, mud and water are less likely to enter the traveling transmission case 100, labor required for cleaning the traveling transmission case 100 is reduced, and deterioration of the oil and fat is also suppressed.
And it becomes difficult for the oil and fat in the driving | running | working transmission case 100 to leak outside, and the contamination of the field by the oil leakage is suppressed.

  As shown in FIG. 11, the outer diameter φ of the lower case body 121 at the contact portion P between the lower case body 121 and the sleeve 122 is set so as to increase slightly from the upper side to the lower side. May be.

  This is because the longitudinal direction of the traveling transmission case 100 does not necessarily coincide with the vertical direction because of the kingpin angle that gives the angular relationship of the wheel alignment and the camber angle that is the inclination angle of the front wheels 21 and 21 in the front view.

  Therefore, for example, when there is insufficient work equipment such as a jig for fitting and driving the sleeve 122 into the lower case main body 121, there is no easy-to-understand reference surface. The assembly of the sleeve 122 is not always easy.

  When the outer diameter φ of the lower case main body 121 is set so as to decrease slightly from the upper side to the lower side as described above, the shape of the contact portion P is that of the sleeve 122 relative to the lower case main body 121. In addition to suppressing the occurrence of falling, it contributes to the realization of a loose fitting with high positional accuracy and few assembling defects.

  As shown in FIG. 12, the upper case 110 corresponding to the suspension configuration may be provided with suspension rod packings 113 and 114 provided double on the inside together with the suspension dust strip 115 provided on the outside. Good.

  FIG. 12 is a schematic partial enlarged view of a traveling transmission case 100 for a work vehicle according to another embodiment in which suspension rod packings 113 and 114 provided in duplicate are provided together with a suspension dust strip 115 according to the present invention. It is sectional drawing.

The position of the suspension rod packing 114 on the upper side is set so as to act when the spring 131 of the suspension mechanism 130 contracts beyond a predetermined amount.
Therefore, the possibility that the oil and fat move in large quantities with the contraction of the spring 131 is reduced, the oil and fat in the upper case 110 becomes difficult to leak to the outside, and contamination of the field due to the leakage of oil and fat is suppressed.

And since mud and water are less likely to enter the traveling transmission case 100, the labor required for cleaning the traveling transmission case 100 is reduced, and the deterioration of fats and oils is also suppressed.
Of course, between the suspension rod packing 113 and the suspension rod packing 114 and between seal parts such as between the suspension rod packing 113 and the suspension dust strip 115, an oil and fat reservoir for suppressing the occurrence of oil film breakage is provided. It may be done.

  As shown in FIG. 13, the upper case 110 may be provided with a breather 116 for adjusting the pressure in the upper case 110 together with an oil inlet 117 for injecting oil into the upper case 110. Good.

  FIG. 13 shows another embodiment of the present invention in which a breather 116 for adjusting pressure in the upper case 110 is provided together with an oil inlet 117 for injecting oil into the upper case 110. 1 is a schematic partial enlarged cross-sectional view of a vehicle traveling transmission case 100. FIG.

An oil filler cap 117a is provided for easily opening and closing the oil filler 117 when injecting grease such as grease.
A breather tube 116a having a lower end connected to the breather 116 and an upper end opened to the atmosphere is provided.

  The breather 116 is disposed on the upper surface of the upper case 110, and the upper end portion of the breather tube 116a is connected to the main frame 40, for example, so that the oil in the upper case 110 does not leak from the upper end portion. It is open to the atmosphere at the height of the lifting step.

Since the pressure adjustment is stably performed, the occurrence of a damper phenomenon that causes uneven distribution of oil and fat due to a pressure change in the upper case 110 is suppressed.
Therefore, it becomes difficult for the oil and fat in the upper case 110 to leak to the outside, and contamination of the field due to the oil and oil leaking out is suppressed.

And since mud and water are less likely to enter the traveling transmission case 100, the labor required for cleaning the traveling transmission case 100 is reduced, and the deterioration of fats and oils is also suppressed.
As shown in FIG. 14, the upper case 110 is provided with upper case drain plugs 118 and 119 for discharging oil and fat from the upper case 110, and the lower case 120 has oil and fat from the lower case 120. A lower case drain plug 126 may be provided for discharging the water.

  FIG. 14 shows that the upper case drain plugs 118 and 119 for discharging oil and fat from the inside of the upper case 110 are provided in the upper case 110 and the lower part for discharging oil and fat from the lower case 120 in the present invention. FIG. 6 is a schematic partial enlarged cross-sectional view of a traveling transmission case 100 of a work vehicle according to another embodiment in which a case drain plug 126 is provided in the lower case 120.

  The upper case drain plug 118 on the upper side is provided on the upper part of the upper case 110, and the upper case drain plug 119 on the lower side is provided on the middle part of the upper case 110.

The lower case drain plug 126 is provided below the lower case 120.
Of course, at least one of the upper case drain plugs 118 and 119 and the lower case drain plug 126 may be provided.

  As shown in FIG. 3, a flange 170 that receives the axle 21 a that rotates the front wheel 21 is formed on the outer side of the lower case 120. The flange 170 is brought into contact with a receiving groove 171a formed on an axle bearing disc 171 provided at the outer end of the axle 21a. Then, a case cover 21b of the front wheel 21 that covers the axle bearing disc 171 and the axle 21a is attached to the outside of the body of the axle bearing disc 171 via a fixing member 21c such as a bolt.

  When foreign matter such as dust and weed enters the inside of the case cover 21b, the axle 170a is not exposed because the flange 170 is in contact with the receiving groove 171a. It is prevented from reaching and tangling.

With the above-described configuration, it is not necessary to remove the front wheel 21 in order to remove foreign matters entangled with the axle 21a after the work, so that the time and labor required for cleaning the machine body after the work are reduced.
The foreign matter may be wound around the outer peripheral edge portion of the flange 170. However, since the flange 170 is formed on the outermost peripheral portion surrounding the axle 21a, it is possible to prevent the foreign matter from being entangled in a complicated manner. At this time, in order to remove the foreign matter wound around the flange 170, a hole (not shown) into which a foreign matter removing member such as a wire can be inserted may be formed in the wheel bearing disk 171 or the case cover 21b. . The hole may be formed in an annular shape with a larger diameter than the axle 21a, but a part of the ring may be filled to form a plurality of arc portions (not shown).

  Also, as shown in FIG. 24 (a), in the unlikely event that foreign matter enters between the flange 170 and the receiving groove 171a, the outer periphery of the flange 170 is shortened so that the length of the foreign matter is reduced so that it is difficult to get entangled. A plurality of crushing protrusions 172 are formed on the inner peripheral portion of the receiving groove 171a or both.

  With the above configuration, the foreign matter that has entered between the flange 170 and the receiving groove 171a is crushed by the plurality of grinding protrusions 172 and cut into short pieces, so that the foreign matter is prevented from being entangled with the axle 21.

Note that the crushing protrusion 172 may have a configuration in which the length is changed for each portion so as to act eccentrically.
Or as shown in FIG.24 (b), it is good also as a structure which makes the crushing protrusion 172 into substantially triangular shape by sectional view, strengthens the surface pressure applied when it contacts a foreign material, and improves crushing performance.

Or as shown in FIG.24 (c), it is good also as a shape which forms the surface of the crushing protrusion 172 in a saw blade shape, and is easy to crush a foreign material.
As shown in FIG. 25, the shape of the case cover 21b may be a dish shape that increases in diameter from the outside of the body toward the inside of the body.

  With the above configuration, the space between the lower cover 120 and the case cover 21b can be widened, so that a lump of soil is less likely to enter between the lower cover 120 and the case cover 21b, and the soil is clogged and the front wheel 21 is blocked. An excessive load is applied to the rotation, and the durability is prevented from being lowered. In particular, the above-mentioned effect is improved by the fact that the soil does not collect during cornering that makes it easy to roll up the soil and is subject to a load.

Further, when removing the mud that has entered the case cover 21b, it is not necessary to remove the front wheel 21, which improves the maintainability and reduces the time and labor required for the cleaning work.
In addition, as shown in FIG. 26, a plurality of holes 21d are provided on the upper and lower sides of the case cover 21b and on the outer side of the machine body, and the soil can easily escape from the holes 21d by centrifugal force caused by the rotation of the front wheel 21. It is good.

  According to the above configuration, a lump of soil does not easily enter between the lower cover 120 and the case cover 21b, and it is prevented that the soil is clogged and an excessive load is applied to the rotation of the front wheel 21 to reduce durability.

  Further, when removing the mud that has entered the case cover 21b, it is not necessary to remove the front wheel 21, which improves the maintainability and reduces the time and labor required for the cleaning work.

  The work vehicle in the present invention can reduce the time and labor required for the maintenance work to remove mud and water, and can automatically adjust the seedling planting depth and fertilizer application amount. It is useful for the purpose of using it as a working machine for transplanting seedlings in the field.

10 Kingpin shaft (main transmission shaft)
20 Traveling body 21 Front wheel (traveling device)
21a axle (front transmission shaft)
22 Rear wheel (rear travel device)
23 Rear wheel gear case (rear transmission member)
24 Rear wheel axle (rear transmission shaft)
51 Steering handle (steering member)
60a Seedling tank 60b Seedling planting device 60c Fertilizer applying device 110 Upper case 120 Lower case 130 Suspension mechanism 131 Spring 150 Control device 151 Potentiometer (vertical movement detection member)
155 Stroke sensor (vertical motion detection member)
160 Torque sensor (torque detection member)
161 Handle potentiometer (steering detection member)
162 Rear torque sensor (rear torque detection member)
163 GPS receiver (GPS receiver)
170 Flange 171 Car bearing disc (shaft support member)
171a Receiving groove

Claims (7)

A seedling tank (60a) for loading seedlings is provided at the rear of the traveling vehicle body (20) so as to be movable up and down, and a seedling planting device (60b) for taking and planting seedlings from the seedling tank (60a) is provided. A fertilizer application device (60c) for supplying fertilizer is provided near the seedling planting position of (60b), a traveling device (21) is provided on the traveling vehicle body (20), and a driving force is transmitted to the traveling device (21). A lower case in which a main transmission shaft (10) is provided, an upper case (110) that covers an upper portion of the main transmission shaft (10) is provided, and the traveling device (21) is attached to a lower portion of the upper case (110). 120) is provided so as to be slidable and rotatable, and the upper mechanism (110) and the lower case (120) are provided with a spring (131) that absorbs the vertical movement of the traveling device (21), and the suspension mechanism (130). Seedling transfer with In the machine,
Vertical movement detection members (151, 155) for detecting the vertical movement amount of the traveling device (21) from the vertical sliding amount of the lower case (120) are provided, and the traveling detected by the vertical movement detection members (151, 155). A seedling transplanter provided with a control device (150) for raising and lowering the seedling tank (60a) in accordance with the vertical movement amount of the device (21). A seedling tank (60a) for loading seedlings is provided at the rear of the traveling vehicle body (20) so as to be movable up and down, a seedling planting device (60b) for taking seedlings from the seedling tank (60a) and planting them is provided, and the seedling planting device A fertilizer application device (60c) for supplying fertilizer is provided near the seedling planting position of (60b), a traveling device (21) is provided on the traveling vehicle body (20), and a driving force is transmitted to the traveling device (21). A lower case in which a main transmission shaft (10) is provided, an upper case (110) that covers an upper portion of the main transmission shaft (10) is provided, and the traveling device (21) is attached to a lower portion of the upper case (110). 120) is provided so as to be slidable and rotatable, and the upper mechanism (110) and the lower case (120) are provided with a spring (131) that absorbs the vertical movement of the traveling device (21), and the suspension mechanism (130). Seedling transfer with In the machine,
Vertical movement detection members (151, 155) for detecting the vertical movement amount of the traveling device (21) from the vertical sliding amount of the lower case (120) are provided, and the traveling detected by the vertical movement detection members (151, 155). A seedling transplanter provided with a control device (150) for increasing or decreasing the fertilizer application amount of the fertilizer application device (60c) in accordance with the vertical movement amount of the device (21).   A steering member (51) for steering the traveling vehicle body (20) is provided, a steering detection member (161) for detecting the steering angle of the steering member (51) is provided, and the traveling torque of the traveling device (21) is detected. A torque detecting member (160) for detecting the torque, and when the angle detected by the steering detecting member (161) is a straight traveling operation angle, the control device (150) detects the traveling torque detected by the torque detecting member (160). The seedling transplanting machine according to claim 2, wherein the fertilizer application amount of the fertilizer application device (60c) is increased or decreased in accordance with the above.   A steering member (51) for steering the traveling vehicle body (20) is provided, a steering detection member (161) for detecting the steering angle of the steering member (51) is provided, and rear traveling is performed at the rear part of the traveling vehicle body (20). A rear transmission device (23) provided with a rear transmission shaft (24) which is provided with a rear transmission shaft (24) which is provided with a device (22) and which transmits a driving force to the rear traveling device (22); 22), a rear torque detecting member (162) for detecting the traveling torque is provided, and the control device (150) detects the rear torque when the angle detected by the steering detecting member (161) is a straight traveling operation angle. The seedling transplanter according to claim 2, wherein the fertilizer application amount of the fertilizer applicator (60c) is increased or decreased in accordance with the running torque detected by the member (162).   The control device (150) includes a travel torque of the travel device (21) detected by the torque detection member (160) and a travel torque of the rear travel device (22) detected by the rear torque detection member (162). The seedling transplanter according to claim 3 or 4, wherein an average running torque of the traveling vehicle body (20) is calculated, and a fertilizer application amount of the fertilizer application (60c) is increased or decreased according to the average running torque. .   The control device (150) acquires position coordinates from a GPS receiver (163) provided on the traveling vehicle body (20), and for each acquired position coordinate, the vertical position of the seedling tank (60a), a fertilizer application device (60c). ), Fertilizer application amount, vertical movement detection amount of the vertical movement detection member (151, 155), torque detection member (160) and work information consisting of running torque of the rear torque detection member (162) is recorded. Item 6. The seedling transplanter according to any one of Items 1 to 5.   A shaft support for providing a front transmission shaft (21a) for transmitting a driving force from the lower case (120) to the traveling device (21) and mounting the traveling device (21) on the end of the front transmission shaft (21a). A member (171) is provided, a receiving groove (171a) is formed in the shaft support member (171), a flange (170) is formed in the lower case (120), and the flange (170) is received in the receiving groove (171a). The seedling transplanting machine according to any one of claims 1 to 6, wherein the seedling transplanting machine is configured to be brought into contact with each other.

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