JP4923742B2 - Agricultural machine - Google Patents

Description

  The present invention relates to a farm work machine in which a ground work device and a granular material application device are provided on the rear side of a traveling vehicle including a pair of left and right front wheels and a rear wheel, such as a tractor and a riding type rice transplanter to which the work machine is mounted.

  Conventionally, in a riding type rice transplanter, a ground work device is provided on the rear side of a traveling vehicle having a pair of left and right front wheels and a rear wheel and on the front side of a seedling planting portion, and a rear wheel transmission case for driving the left and right rear wheels is provided. There is known one provided with a ground work transmission mechanism that is branched from a transmission shaft into the rear wheel transmission case and is transmitted to the ground work device (see Patent Document 1).

  In addition, a fertilizer is provided on the rear side of the traveling vehicle having a pair of left and right front wheels and a rear wheel, a rear wheel transmission case for driving the left and right rear wheels is provided, and from within the rear wheel transmission case What provided the transmission mechanism for the granular material application transmitted to the said granular material application apparatus is known (refer patent document 2).

In addition, a fertilizer is provided on the rear side of the traveling vehicle having a pair of left and right front wheels and rear wheels, and a left and right rear wheel transmission case (34) for driving the left and right rear wheels (4) is provided. What is provided is known (see Patent Document 3).
Japanese Utility Model Publication No. 4-42111 JP 2006-87366 A ([0052], [FIG. 11]) JP 2006-87436 A

  Patent Documents 1 and 2 provide a common rear wheel transmission case for driving the left and right rear wheels, branch off from a common transmission path to the left and right rear wheels, and to a ground work device or a granular material application device. The transmission is configured so that the driving force of the rear wheels does not become unbalanced on the left and right.

  However, when the left and right rear wheel transmission cases for driving the left and right rear wheels are provided as in the case of Patent Document 3, only the left and right rear wheel transmission cases are transferred from the rear wheel transmission case to the ground work device or the granular material application device. If it is configured to transmit, the transmission load in the rear wheel transmission case only on one of the left and right sides becomes large, and as a result, the driving force of the left and right rear wheels may be different, and the straightness of the airframe may be deteriorated.

  In addition, when the rear wheel transmission case is configured to be rotatable up and down around the rotation fulcrum axis and the rear wheel is configured to be movable up and down, the power from the rear wheel transmission case is branched and grounded by the transmission mechanism. If it is configured to transmit to the working device or the granular material application device, the rear wheel transmission case moves, so the position of the transmission mechanism also changes, and depending on the position of the transmission mechanism, there is a risk that the transmission mechanism may not be able to transmit smoothly and stably. There is.

In order to solve the above problems, the present invention has taken the following technical means.
That is, the invention according to claim 1 is provided with a ground work device (38) and a powder application device (8) on the rear side of a traveling vehicle including a pair of left and right front wheels (3) and a rear wheel (4). In the agricultural working machine provided with the left and right rear wheel transmission cases (34) for driving the left and right rear wheels (4), one of the left and right sides is input via an input shaft (37) for inputting power to the ground work device (38). A ground work transmission mechanism for transmitting power for driving the ground work device (38) from the rear wheel transmission case (34) to the ground work device (38), and the other rear wheel via a drive rod (45). Agricultural work provided with a transmission mechanism for applying powder to transmit power for rotating the feeding portion (10) of the powder application device (8) from the transmission case (34) to the powder application device (8) It was a machine.

Therefore, the agricultural machine according to claim 1 drives the left and right rear wheels 4 with power from the left and right rear wheel transmission cases 34, and from the left and right rear wheel transmission cases 34 via the ground work transmission mechanism. Power is transmitted to drive the ground work device 38, and the powder material application device 8 is driven from the other rear wheel transmission case 34 through the powder material application transmission mechanism to drive the pair of left and right front wheels 3 and rear The ground work and the powder application work are performed while the machine body is driven by the wheel 4. Therefore, since the transmission to the ground work device 38 and the granular material application device 8 is divided between the left and right rear wheel transmission cases 34, the transmission load in the left and right rear wheel transmission cases 34 can be made uniform, The ground work transmission mechanism and the powder application transmission mechanism can be configured in a simple manner without intermingling.

  In the invention according to claim 2, the left and right rear wheel transmission cases (34) are rotated up and down around the rotation fulcrum shaft (54) in front of the rear wheel axle (56) provided in the case (34). It is configured to be movable, and power is branched from the transmission shafts (35, 39) in the rear wheel transmission case (34) closer to the rotation fulcrum shaft (54) than the rear wheel axle (56), and the ground work device (38) And it was set as the agricultural work machine of Claim 1 made into the structure transmitted to the granular material application apparatus (8).

Therefore, in addition to the operation of the agricultural machine according to claim 1, the agricultural machine according to claim 2 is configured to rotate the rear wheel transmission case 34 up and down around the rotation fulcrum shaft 54. Can be moved up and down. Further, the power is branched from the transmission shafts 35 and 39 in the rear wheel transmission case 34 closer to the rotation fulcrum shaft 54 than the rear wheel axle 56 and is transmitted to the ground work device 38 and the powder application device 8. Therefore, the movement amount or position change of the ground work transmission mechanism and the granular material application transmission mechanism due to the rotation of the rear wheel transmission case 34 can be reduced.

According to the first aspect of the present invention, since the transmission loads in the left and right rear wheel transmission cases 34 can be made uniform, the driving force of the left and right rear wheels 4 can be made uniform, and the running performance and straight running performance of the aircraft can be improved. improves. Further, the ground work transmission mechanism and the granular material application transmission mechanism can be simply configured without crossing them.

Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the rear wheel transmission case 34 can be turned up and down to move the rear wheel 4 up and down. The front and rear tilt posture can be changed. Moreover, the movement amount or position change of the transmission mechanism for ground work and the transmission mechanism for applying the granular material due to the rotation of the rear wheel transmission case 34 can be reduced, and the transmission can be smoothed and stabilized by these transmission mechanisms. The ground work by the ground work device 38 and the powder application work by the powder application device 8 can be optimized.

A seedling transplanter serving as an agricultural working machine according to an embodiment of the present invention will be described below.
FIG. 1 and FIG. 2 show a riding type 4-row transplanter (seedling transplanter) 1 having a traveling vehicle. A pair of left and right front wheels 3 and rear wheels 4 as traveling wheels are provided in front of and behind a vehicle body 2. Is built. A steering device having an operation box 5 and a steering handle 6 is installed at the front upper part of the vehicle body, and a seedling planting part 7 that can be moved up and down is provided at the rear of the vehicle body 2. Further, a fertilizer 8 serving as a granular material application device is provided at the rear portion of the vehicle body 2, and fertilizer stored in the fertilizer tank 9 is fed out by a predetermined amount by the feeding unit 10 of each strip, and the fed fertilizer is fed from the blower 11 It is the structure which discharges from the discharge port 13 provided in the seedling planting part 7 with the transfer air hose 12 of each strip | line, and fertilizes with the pressure wind of. In addition, a ground leveling rotor 38 serving as a ground working device supported by a link 61 from the seedling planting unit 7 so that the vertical position can be changed is provided on the rear side of the vehicle body 2 and in front of the seedling planting unit 7. It is configured to level the field before planting by driving. The height of the leveling rotor 38 relative to the seedling planting portion 7 can be changed and set by rotating the link 61 by operating the rotor height adjusting lever 62. A driver's seat (seat) 14 is installed on the rear side of the control device, and an engine 15 that transmits power to each part of the rice transplanter is mounted below the driver's seat 14.

  A muffler 63 that exhausts rearward is provided at the upper portion of the engine 15, and an air inlet 11 a of the blower 11 is disposed in the front side behind the muffler 63. Therefore, the blower 11 can suck the hot air from the muffler 63, and the fertilizer application 8 can prompt the drying of the fertilizer. The engine cover 64 that covers the engine 15 from above is configured to close the front and left and right sides of the engine 15 and open the rear, and supports the upper seat 14. The seat 14 is configured to be pivotable forward about the pivot shaft 14a at the front portion, and a fuel supply hole 64a provided in the upper surface portion of the engine cover 64 in a state where the seat 14 is pivoted to the front side. The structure is such that the fuel can be supplied to the fuel supply port 65 provided in the engine cover 64 through the fuel supply hole 64a. The fuel supply hole 64a is configured to be deviated with respect to the fuel supply port 65 and configured to start the engine 15 by pulling the recoil knob 66 in the engine cover 64 through the fuel supply hole 64a. Yes. Therefore, the hole 64a serves both for supplying fuel and for starting the engine (for operating the recoil knob), and for starting the engine (for operating the recoil knob) on the exposed part of the engine cover or the vehicle body cover as in the prior art. There is no need to provide holes, and the appearance is improved. A cell motor is also provided for starting the engine 15, and the recoil knob 66 is configured to be used as an emergency when the cell motor fails.

  The engine cover 64 is configured to rotate forward about a fulcrum shaft 64b provided at the front lower end of the cover 64, and the engine 15 is exposed by the rotation of the engine cover 64, so that the engine cover 64 is exposed from the outside. 15 maintenances can be performed. Since the fulcrum shaft 64b is located below the step floor surface 67 of the vehicle body 2, the amount of movement of the engine cover 64 due to rotation can be increased, and the open space can be increased. Conventionally, since the fulcrum shaft is higher than the step floor surface, there is a problem that an open space due to the rotation of the engine cover cannot be obtained sufficiently.

  The steering handle 6 is steered by steering the left and right front wheels 3 via an output shaft, a pitman arm, a steering rod, and the like that are decelerated and rotated from the steering shaft in the steering post through the steering case. It is supposed to be.

  The seedling planting part 7 is mounted on the rear part of the vehicle body 2 through a lifting link mechanism 17 so as to be lifted and lowered by a telescopic operation of the lifting hydraulic cylinder 18, and in this example, the pulling side of the hydraulic cylinder 18 is arranged. It is set as the structure which raises the seedling planting part 7 by. Reference numeral 19 denotes a planting lift lever.

  The seedling planting section 7 includes a seedling mounting tank 20 that reciprocates left and right, a planting device 22 having a planting basket 21 for cutting out seedlings for one stock and planting them in the soil, a seedling planting surface A float (side float) 23, a center float 24, and the like that level the ground while sliding are provided. The upper fulcrum 68 on the seedling planting part 7 side of the lifting link mechanism 17 is provided so as to be movable back and forth by a longitudinal hole 69 provided in the lifting link mechanism 17 and attached to the front side by a swinging spring 70. It is energized. Therefore, the seedling planting portion 7 swings back and forth around the lower fulcrum 71 of the lifting link mechanism 17 following the farm scene by the interchange mechanism of the long hole 69 that makes the upper fulcrum 68 movable. The vehicle body 2 is configured to maintain a desired front / rear tilt posture with respect to the farm field regardless of the front / rear tilt of the vehicle body 2.

  The rotational power of the engine 15 is supplied to an input pulley 28 and an input shaft of a hydraulic continuously variable transmission (HST) 27 via a belt 26 extending forward from a pulley 25a on the inner side in the left-right direction of the two engine output pulleys 25. The hydraulic pump 71 is driven from the input shaft 29 via a transmission shaft provided on the same axis as the input shaft 29, and from the output shaft of the hydraulic continuously variable transmission 27. It is transmitted to the mission input shaft of the mission case 30. Further, the two engine output pulleys 25 are transmitted to an input pulley 74 of a generator 73 via a belt 72 extending rearward from a pulley 25b on the outer side in the left-right direction, thereby driving the generator 73. The hydraulic continuously variable transmission (HST) 27, the input pulleys 28 and 74 of the generator 73, and the engine output pulley 25 are arranged in a straight line in the front-rear direction when viewed from the side of the machine body. A belt cover 75 for safety is provided on the sides (outside in the left-right direction) of the belts 26 and 72 wound around the belt, and the belt cover 75 has a straight and simple structure in a side view of the body. Further, since the engine output pulley 25 and the generator 73 are not located within the engine cover 64, the engine cover 64 can be made smaller and more compact accordingly. The belt cover 75 is bent so that the belt 72 is disposed outward in the left-right direction, and the rear portion is positioned outward in the left-right direction. Conventionally, the generator is arranged in the engine cover, and the belt for transmission to the generator is extended upward from the engine output pulley. Therefore, the engine cover has to be enlarged as much as the generator is arranged. In addition, the belt cover has to be configured in an L shape in a side view of the body, and the structure of the belt cover is complicated.

  A shift lever 31 for driving the hydraulic continuously variable transmission 27 is disposed in the vicinity of the upper portion of the operation box, that is, the front cover 5, and the hydraulic continuously variable transmission 27 is operated by operating the shift lever 31 in the front-rear direction. It is configured to drive and manage forward and backward control of the airframe. A brake pedal 32 for braking the front wheel 3 and the rear wheel 4 is provided on the front right side of the driver seat 14. Further, a pedal holding device is provided that can hold the brake pedal 32 in a depressed operation state (braking state).

  The seedling planting unit 7 is operated by the power from within the mission case 30 and the front wheels 3 provided on the left and right sides of the mission case 30 are driven. The power from the transmission case 30 is transmitted to the left and right rear wheel transmission cases 34 via the left and right rear wheel transmission shafts 33, and the rear wheels 4 are driven.

  A main frame 76 extending rearward is fixed to the rear surface of the mission case 30, and a rear frame 49 extending in the left-right direction is fixed to the rear end of the main frame 76. The left and right upper and lower frames 77 extending upward are fixed to the rear frame 49, and the elevating link mechanism 17 is rotatably supported by the upper and lower frames 77, and a fertilizer tank is disposed above the upper and lower frames 77. Main parts of the fertilizer application device 8 such as 9 and the feeding unit 10 are supported. Further, a reinforcing frame 78 is provided that connects the main frame 76 and the upper and lower frames 77 and is inclined forward and downward. The lower end portion of the reinforcing frame 78 protrudes downward from the main frame 76, and the lower end portion of the reinforcing frame 78 is provided. A base fulcrum shaft 79 for supporting the lifting hydraulic cylinder 18 is provided. This eliminates the need for special parts for attaching the base fulcrum shaft 79, reduces costs, and allows the elevating hydraulic cylinder 18 to be disposed at a low position, thereby reducing the center of gravity of the airframe.

  A left-right rotor output shaft 35 that is output from the case 34 is provided on the inner side (right side) of the left rear wheel transmission case 34 in the left-right direction. A leveling rotor 38 provided on the rear side of the vehicle body 2 and on the front side of the seedling planting portion 7 through a rotor driving case 36 and a rotor transmission shaft 37 that can be rotated up and down around the shaft 35 from the rotor output shaft 35. And the leveling rotor 38 is driven. Accordingly, the rotor driving case 36, the rotor transmission shaft 37, and the like serve as a ground work transmission mechanism that transmits power from the rear wheel transmission case 34 to the leveling device 38. The leveling rotor 38 is divided into a left and right central rotor 38a and left and right side rotors 38b, and the central rotor 38a is positioned in front of the side rotor 38b. The power from the rotor transmission shaft 37 is first input to the left and right central positions of the central rotor 38a, transmitted to the central rotor 38a, and transmitted from the central rotor 38a to the left and right side rotors 38b via the left and right rotor transmission cases 80. It is the composition which becomes.

  On the other hand, an output shaft 39 for fertilization in the left-right direction output from the case 34 is provided on the inner side (left side) in the left-right direction of the rear wheel transmission case 34 on the right side. The fertilizer output shaft 39 is transmitted to the fertilizer drive shaft 43 through a drive crank arm 40, a drive rod 41 and a driven arm 42 that rotate integrally with the shaft 39 so as to reciprocate and rotate. 43 to each feeding section 10 provided on the left and right of the fertilization transmission mechanism 48 via a fertilization transmission mechanism 48 constituted by the input arm 44, the rod 45, the output arm 46, the one-way clutch 47, etc. Transmission is configured to rotate the feeding rotor in the feeding unit 10 in one direction at a predetermined angle. Therefore, a transmission mechanism for applying powder material that is transmitted from the rear wheel transmission case 34 to the fertilizer 8 by the drive crank arm 40, the drive rod 41, the driven arm 42, the fertilizer drive shaft 43, the fertilizer transmission mechanism 48, and the like. It is composed.

  In this way, when transmitting from the left and right rear wheel transmission cases 34 to the leveling rotor 38 and the feeding portion 10 of the fertilizer application device 8, transmission is performed from one rear wheel transmission case 34 to the leveling rotor 38 and the other rear wheel transmission case 34 is transmitted. As the structure for transmitting the power to the feeding section 10, the transmission outputs are distributed to the left and right, so that the transmission load in the left and right rear wheel transmission cases 34 can be made uniform, and consequently the driving force of the left and right rear wheels 4. And the running performance and straight running performance of the aircraft are improved. Moreover, it can comprise simply, without making the transmission mechanism to the feeding part 10 of the leveling rotor 38 and the fertilizer applicator 8 cross.

  The left and right rear wheel transmission cases 34 are shared, and are provided symmetrically so that the rear wheel axle 56 faces the left and right outer sides. Therefore, the rotor output shaft 35 provided on the left rear wheel transmission case 34 and the fertilizer output shaft 39 provided on the right rear wheel transmission case 34 are the same shaft in the rear wheel transmission case 34, and the rear It also serves as a counter transmission shaft in transmission from the input shaft 34 b of the wheel transmission case 34 to the rear wheel axle 56. The counter transmission shafts 35 and 39 are disposed in front of the rear wheel axle 56 and rearward of a hole for inserting a rotation fulcrum shaft 54 described later. Accordingly, the counter transmission shafts 35 and 39 become transmission shafts in the rear wheel transmission case 34 that are closer to the rotation fulcrum shaft 54 than the rear wheel axle 56.

  A first support member 50 on the inner side in the left-right direction and a second support member 51 on the outer side in the left-right direction are provided on the left and right ends of the rear frame 49 provided in the rear portion of the vehicle body 1 and extending in the left-right direction. Yes. The first support member 50 and the second support member 51 extend downward from the rear frame 49, the first support member 50 is fixed by welding to the rear frame 49, and the second support member 51 is attached to the rear frame 49. A bracket 52 provided at the end is detachably mounted by four mounting bolts 53 in total, front and rear. A rotation fulcrum shaft 54 extending outward in the left-right direction is fixed to the lower end portion of the first support member 50 by welding, and a hole for inserting the end portion of the rotation fulcrum shaft 54 into the lower end portion of the second support member 51. 51a is provided. Therefore, the rotation fulcrum shaft 54 is supported at both ends by the first support member 50 and the second support member 51. As a result, the support of the rotation fulcrum shaft 54 is stabilized, the backlash of the shaft 54 can be suppressed, and the vertical movement of the rear wheel 4 described later can be performed appropriately and stably. Between the first support member 50 and the second support member 51 in the left-right direction, a third U-shaped third support member 55 extending rearward from the rear frame 49 is provided. Since the second support member 51 is configured to be detachable from the rear frame 49 by the mounting bolt 53, the rotation fulcrum shaft 54 that is cantilevered by the first support member 50 by removing the second support member 51. The rear wheel transmission case 34 can be easily attached and detached from the outside in the left-right direction of the aircraft.

  The rear wheel transmission case 34 includes a hole for inserting the rotation fulcrum shaft 54 and an upper and lower divided case 34a that is divided at a position sandwiching the rear wheel axle 56. The upper and lower divided cases 34a are shared. Yes. The rear wheel axle 56 is located on the rear side of the hole. A restriction pin 57 is provided on the left and right inner sides of the upper divided case 34 a, and a restriction arm 58 having a long hole 58 a into which the restriction pin 57 is inserted is provided on a side surface of the third support member 55. It is provided so as to be rotatable around 59. Therefore, the movement of the restriction pin 57 is restricted in the elongated hole 58a, and the vertical rotation area of the rear wheel transmission case 34 is restricted. Therefore, the restriction pin 57 and the restriction arm 58 serve as restriction members for restricting the vertical rotation area of the rear wheel transmission case 34. Further, a cushion rubber 60 serving as an elastic member is provided on the lower surface of the third support member 55, and the cushion rubber 60 contacts the rear wheel transmission case 34 to absorb vibration from the rear wheel 4. It has become.

  Therefore, the rear wheel transmission case 34 is configured to be able to rotate up and down around the rotation fulcrum shaft 54, and during normal traveling where the driving load of the rear wheel 4 is small even when moving backward and forward, the regulating arm 58 is driven by the weight of the airframe. The rear wheel transmission case 34 moves up to the position where the restriction pin 57 hits the upper end of the long hole 58a, and the rear wheel 4 is in the uppermost state. At this time, the rear wheel transmission case 34 abuts against the cushion rubber 60 and vibrations of the airframe are suppressed. On the other hand, when a driving load exceeding a predetermined value occurs on the rear wheel 4 during forward movement, the rear wheel transmission case 34 rotates downward against the dead weight of the fuselage by the driving reaction force, causing the rear wheel 4 to move downward. To do. The downward movement of the rear wheel 4 is regulated at the lowest position by the regulation pin 57 hitting the lower end of the long hole 58a of the regulation arm 58.

  The rotation fulcrum shaft 54 is set within the outer diameter of the rear wheel 4. Accordingly, since the distance between the rotation fulcrum shaft 54 and the rear wheel axle 56 is set small, the rear wheel transmission case 34 can be rotated downward by the driving reaction force of the rear wheel 4.

  By the way, the rear wheel transmission shaft 33 includes a joint (a universal joint) 33a that can be freely bent at a front portion near the transmission case 30 and a rear portion near the rear wheel transmission case 34. The structure adapts to the movement of the input shaft 34b of the rear wheel transmission case 34 by rotation. Then, in the rear joint 33a that is greatly bent and changed by the rotation of the rear wheel transmission case 34, when the rear wheel transmission case 34 is rotated upward as much as possible, the joint 33a is recessed upward. When the rear wheel transmission case 34 is rotated downward as much as possible so that the rear wheel axle 56 is at the lowest position, the joint 33a is bent so as to be concave downward, and the rear wheel transmission case 34 is In the rotation, the rear wheel transmission shaft 33 is arranged in the vertical direction with the bending directions opposite to each other. Therefore, since the bending angle of the joint 33a can be set as small as possible within the permissible range in the entire vertical rotation range of the rear wheel transmission case 34, transmission loss due to the rear wheel transmission shaft 33 can be reduced, and transmission to the rear wheel transmission case 34 can be achieved. Can be improved. Further, the bending angle of the joint 33a of the rear wheel transmission shaft 33 when the rear wheel axle 56 is at the uppermost position is smaller than the bending angle of the joint 33a of the rear wheel transmission shaft 33 when the rear wheel axle 56 is at the lowermost position. Therefore, during normal traveling where the driving load of the rear wheel 4 is small even when the vehicle is moving backward or forward, the rear wheel transmission case 34 is rotated upward due to the weight of the fuselage and the rear wheel axle 56 is at the uppermost position. The bending angle of 33a is small, transmission loss due to the rear wheel transmission shaft 33 can be reduced, and transmission to the rear wheel transmission case 34 can be improved.

  With this rice transplanter 1, during normal planting, the rear wheel 4 is in the uppermost state during normal traveling load, and when the tiller is deep and an excessive traveling load is applied, the wheel sharing load is more than the front wheel 3. Although the large rear wheel 4 sinks deeply into the field and the driving reaction force of the rear wheel 4, the aircraft is likely to rise forward, but when the rear wheel 4 moves downward, the aircraft rises forward. Is corrected, and it is possible to prevent the seedling planting posture from being disturbed by the settlement of the planting part 7. On the other hand, since the traveling load increases at the time of turning the vehicle at the shore, the rear wheel 4 is automatically moved downward so that the vehicle is in a forward-lowering posture. The driving load of the front wheel 3 that drives both the left and right sides with respect to the rear wheel 4 that drives only the outside of the turn can be increased by cutting off the driving of the vehicle. Can be performed smoothly. Also, when traveling over the ridge or when loading on the truck during forward travel, the traveling load increases, so the rear wheel 4 moves downward and the front-up posture of the fuselage is corrected. Can be planned. In addition, the rear wheel 4 is maintained in the upward movement state when the aircraft is in the rearward raising posture even when over the ridge or when being loaded onto the truck, and the aircraft is further raised in the rearward posture by moving the rear wheel 4 downward. It will never be safe.

  Further, since the rotor output shaft 35 and the fertilizer application output shaft 39 which are counter transmission shafts of the rear wheel transmission case 34 are located closer to the rotation fulcrum shaft 54 than the rear wheel axle 56, the rotation of the rear wheel transmission case 34 is performed. The amount of movement or change in position of the ground transmission mechanism and the powder application mechanism can be reduced, and the transmission can be smoothed and stabilized by the transmission mechanism. As a result, the leveling work and fertilizer 8 by the leveling rotor 38 can be achieved. Can optimize the fertilization work.

  In addition, it can replace with the above-mentioned cushion rubber | gum 60, and it can be set as the structure which provides a compression spring and the said compression spring acts in the up-and-down rotation whole region of the rear-wheel transmission case 34. FIG. The compression spring is fully compressed during normal travel when the driving load of the rear wheel 4 is small even when the vehicle is moving backward and forward, and the compression spring is extended when a predetermined driving load is generated on the rear wheel 4 during the forward movement. The downward rotation of the rear wheel transmission case 34 can be urged. Even when this compression spring is provided, the cushion rubber 60 as described above may be used in combination.

  In providing the compression spring, the compression spring is provided so as to be wound around the outer periphery of the restriction arm 58, one end is in contact with the third support member 55, and the other end is in contact with the restriction pin 57. The rear wheel transmission case 34 may be configured to be biased downward. That is, the compression spring is supported by the restricting arm 58 passing through the inside thereof, so that the compression spring can be prevented from coming off and the configuration can be simplified.

  In addition, in the configuration provided with a compression spring that serves as an urging means for urging the rear wheel 4 upward or downward, the load for moving the rear wheel 4 downward can be arbitrarily changed by varying the urging force. The rear wheel 4 is not moved down when the machine is “moving” (running on the road) by switching the shift lever, and the rear wheel 4 is moved down only during high loads when the front part of the machine is raised during “planting”. By configuring the rear part of the aircraft to rise, the rear wheel 4 is not moved up and down when traveling on the road with a small driving reaction force, and the rear wheel 4 is not moved up and down more than necessary when traveling on a field with a large driving reaction force. It becomes possible to give resistance.

  Further, in the above-described configuration, the rear wheel 4 is not moved down at the time of forward / backward traveling due to the operation of the transmission lever 31 that drives the hydraulic continuously variable transmission 27, and the front part of the body is lifted at the middle / high speed. The rear wheel 4 can also be configured to move downward only during such a high load, and the rear wheel 4 is not moved up and down in low speed traveling with a small driving reaction force, and the rear wheel is more than necessary in high speed traveling with a large driving reaction force. It is possible to provide resistance so that 4 does not move up and down.

  In addition, the rear wheel 4 is not moved down when the throttle of the engine 15 is low, and the rear wheel 4 is moved down to raise the rear part of the aircraft only at high loads where the front part of the fuselage is lifted at medium and high speeds. You can also

  The above-described cushion rubber 60 is set to have elastic characteristics such that it compresses and bends when the vehicle is moving backward, and the rear part of the aircraft is lowered to relieve the vehicle from being lowered when the vehicle is moving backward. Can also be prevented. According to this, it is possible to easily go over the ridge and Ayumi in the reverse direction, and the reverse performance in the wet field having a large running resistance is improved.

  Further, a restricting tool for restricting the vertical rotation of the left and right rear wheel transmission cases 34 in conjunction with the operation of the brake pedal 32 is provided, and the rear wheel 4 is fixed so as not to move up and down when the vehicle is stopped running. If the brake pedal 32 is held in the depressed state by the pedal holding device during transportation on a truck, etc., the rear wheel 4 can be prevented from moving up and down by vibration during transportation, and the rear wheel transmission case. It is possible to prevent the rear frame 49 and the rear wheel transmission case 34 from being damaged due to a sudden up-and-down movement of the 34, and the rope hung on the fuselage to be held on the cargo bed etc. is pulled and loosened or cut off. You can prevent anything.

  Further, one of the left and right rear wheel transmission cases 34 and one end of a rotating arm 81 provided on the vehicle body 2 are connected by a first cable 82, and the other end of the rotating arm 81 and an upper fulcrum 68 of the elevating link mechanism 17. The other end (front end) of the swinging spring 70 that urges the front side to the front side is connected by the second cable 83, and the rear wheel 4 is connected by the interlocking mechanism including the rotating arm 81, the first cable 82, and the second cable 83. The upper fulcrum 68 is pulled forward to correct the seedling planting part 7 to the forward tilted position when the rear wheel 4 is in the lowered state, and the second cable 83 is loosened to raise the seedling planting part. 7, the upper fulcrum 68 moves to the rear side, and the seedling planting part 7 is corrected to the tilted posture. Accordingly, the front / rear tilting posture of the seedling planting unit 7 is corrected to a desired posture according to the change of the front / rear tilting posture of the vehicle body 2 due to the vertical movement of the rear wheel 4, and the leveling by the leveling rotor 38 and the floats 23, 24 is corrected. It is possible to improve the nature and to optimize the planting posture and planting depth of the seedling.

Side view of rice transplanter Top view of rice transplanter Top view showing the engine cover Rear view showing part of fertilizer application and rear wheel transmission case Side view of rear wheel transmission case

  1: rice transplanter, 2: vehicle body, 3: front wheel, 4: rear wheel, 8: fertilizer, 34: rear wheel transmission case, 35: rotor output shaft, 36: rotor drive case, 37: rotor transmission shaft, 38: Fertilizer output rotor, 39: Fertilizer output shaft, 40: Drive crank arm, 41: Drive rod, 42: Follower arm, 43: Fertilizer drive shaft, 48: Fertilizer transmission mechanism, 54: Rotating fulcrum shaft, 56: Rear Wheel axle

Claims (2)

A ground work device (38) and a granular material application device (8) are provided on the rear side of a traveling vehicle including a pair of left and right front wheels (3) and a rear wheel (4) to drive the left and right rear wheels (4). In the agricultural working machine provided with the left and right rear wheel transmission cases (34), the ground from the left and right rear wheel transmission cases (34) via an input shaft (37) for inputting power to the ground work device (38). The ground material transmission mechanism for transmitting the power for driving the ground work device (38) to the work device (38), and the powder from the other rear wheel transmission case (34) through the drive rod (45). Agricultural work machine provided with a transmission mechanism for applying powder to transmit power for rotating the feeding section (10) of the powder application device (8) to the application device (8) .   Each of the left and right rear wheel transmission cases (34) is configured to be rotatable up and down around a rotation fulcrum shaft (54) in front of a rear wheel axle (56) provided in the case (34). ) From the transmission shafts (35, 39) in the rear wheel transmission case (34) closer to the rotation fulcrum shaft (54) and transmitted to the ground work device (38) and the powder application device (8). The agricultural working machine according to claim 1, which is configured as described above.

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